target/iscsi/iscsi_target.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*******************************************************************************
0003  * This file contains main functions related to the iSCSI Target Core Driver.
0004  *
0005  * (c) Copyright 2007-2013 Datera, Inc.
0006  *
0007  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
0008  *
0009  ******************************************************************************/
0010
0011 #include <crypto/hash.h>
0012 #include <linux/string.h>
0013 #include <linux/kthread.h>
0014 #include <linux/completion.h>
0015 #include <linux/module.h>
0016 #include <linux/vmalloc.h>
0017 #include <linux/idr.h>
0018 #include <linux/delay.h>
0019 #include <linux/sched/signal.h>
0020 #include <asm/unaligned.h>
0021 #include <linux/inet.h>
0022 #include <net/ipv6.h>
0023 #include <scsi/scsi_proto.h>
0024 #include <scsi/iscsi_proto.h>
0025 #include <scsi/scsi_tcq.h>
0026 #include <target/target_core_base.h>
0027 #include <target/target_core_fabric.h>
0028
0029 #include <target/iscsi/iscsi_target_core.h>
0030 #include "iscsi_target_parameters.h"
0031 #include "iscsi_target_seq_pdu_list.h"
0032 #include "iscsi_target_datain_values.h"
0033 #include "iscsi_target_erl0.h"
0034 #include "iscsi_target_erl1.h"
0035 #include "iscsi_target_erl2.h"
0036 #include "iscsi_target_login.h"
0037 #include "iscsi_target_tmr.h"
0038 #include "iscsi_target_tpg.h"
0039 #include "iscsi_target_util.h"
0040 #include "iscsi_target.h"
0041 #include "iscsi_target_device.h"
0042 #include <target/iscsi/iscsi_target_stat.h>
0043
0044 #include <target/iscsi/iscsi_transport.h>
0045
0046 static LIST_HEAD(g_tiqn_list);
0047 static LIST_HEAD(g_np_list);
0048 static DEFINE_SPINLOCK(tiqn_lock);
0049 static DEFINE_MUTEX(np_lock);
0050
0051 static struct idr tiqn_idr;
0052 DEFINE_IDA(sess_ida);
0053 struct mutex auth_id_lock;
0054
0055 struct iscsit_global *iscsit_global;
0056
0057 struct kmem_cache *lio_qr_cache;
0058 struct kmem_cache *lio_dr_cache;
0059 struct kmem_cache *lio_ooo_cache;
0060 struct kmem_cache *lio_r2t_cache;
0061
0062 static int iscsit_handle_immediate_data(struct iscsit_cmd *,
0063             struct iscsi_scsi_req *, u32);
0064
0065 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
0066 {
0067     struct iscsi_tiqn *tiqn = NULL;
0068
0069     spin_lock(&tiqn_lock);
0070     list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
0071         if (!strcmp(tiqn->tiqn, buf)) {
0072
0073             spin_lock(&tiqn->tiqn_state_lock);
0074             if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
0075                 tiqn->tiqn_access_count++;
0076                 spin_unlock(&tiqn->tiqn_state_lock);
0077                 spin_unlock(&tiqn_lock);
0078                 return tiqn;
0079             }
0080             spin_unlock(&tiqn->tiqn_state_lock);
0081         }
0082     }
0083     spin_unlock(&tiqn_lock);
0084
0085     return NULL;
0086 }
0087
0088 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
0089 {
0090     spin_lock(&tiqn->tiqn_state_lock);
0091     if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
0092         tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
0093         spin_unlock(&tiqn->tiqn_state_lock);
0094         return 0;
0095     }
0096     spin_unlock(&tiqn->tiqn_state_lock);
0097
0098     return -1;
0099 }
0100
0101 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
0102 {
0103     spin_lock(&tiqn->tiqn_state_lock);
0104     tiqn->tiqn_access_count--;
0105     spin_unlock(&tiqn->tiqn_state_lock);
0106 }
0107
0108 /*
0109  * Note that IQN formatting is expected to be done in userspace, and
0110  * no explict IQN format checks are done here.
0111  */
0112 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
0113 {
0114     struct iscsi_tiqn *tiqn = NULL;
0115     int ret;
0116
0117     if (strlen(buf) >= ISCSI_IQN_LEN) {
0118         pr_err("Target IQN exceeds %d bytes\n",
0119                 ISCSI_IQN_LEN);
0120         return ERR_PTR(-EINVAL);
0121     }
0122
0123     tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
0124     if (!tiqn)
0125         return ERR_PTR(-ENOMEM);
0126
0127     sprintf(tiqn->tiqn, "%s", buf);
0128     INIT_LIST_HEAD(&tiqn->tiqn_list);
0129     INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
0130     spin_lock_init(&tiqn->tiqn_state_lock);
0131     spin_lock_init(&tiqn->tiqn_tpg_lock);
0132     spin_lock_init(&tiqn->sess_err_stats.lock);
0133     spin_lock_init(&tiqn->login_stats.lock);
0134     spin_lock_init(&tiqn->logout_stats.lock);
0135
0136     tiqn->tiqn_state = TIQN_STATE_ACTIVE;
0137
0138     idr_preload(GFP_KERNEL);
0139     spin_lock(&tiqn_lock);
0140
0141     ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
0142     if (ret < 0) {
0143         pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
0144         spin_unlock(&tiqn_lock);
0145         idr_preload_end();
0146         kfree(tiqn);
0147         return ERR_PTR(ret);
0148     }
0149     tiqn->tiqn_index = ret;
0150     list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
0151
0152     spin_unlock(&tiqn_lock);
0153     idr_preload_end();
0154
0155     pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
0156
0157     return tiqn;
0158
0159 }
0160
0161 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
0162 {
0163     /*
0164      * Wait for accesses to said struct iscsi_tiqn to end.
0165      */
0166     spin_lock(&tiqn->tiqn_state_lock);
0167     while (tiqn->tiqn_access_count != 0) {
0168         spin_unlock(&tiqn->tiqn_state_lock);
0169         msleep(10);
0170         spin_lock(&tiqn->tiqn_state_lock);
0171     }
0172     spin_unlock(&tiqn->tiqn_state_lock);
0173 }
0174
0175 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
0176 {
0177     /*
0178      * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
0179      * while holding tiqn->tiqn_state_lock.  This means that all subsequent
0180      * attempts to access this struct iscsi_tiqn will fail from both transport
0181      * fabric and control code paths.
0182      */
0183     if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
0184         pr_err("iscsit_set_tiqn_shutdown() failed\n");
0185         return;
0186     }
0187
0188     iscsit_wait_for_tiqn(tiqn);
0189
0190     spin_lock(&tiqn_lock);
0191     list_del(&tiqn->tiqn_list);
0192     idr_remove(&tiqn_idr, tiqn->tiqn_index);
0193     spin_unlock(&tiqn_lock);
0194
0195     pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
0196             tiqn->tiqn);
0197     kfree(tiqn);
0198 }
0199
0200 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
0201 {
0202     int ret;
0203     /*
0204      * Determine if the network portal is accepting storage traffic.
0205      */
0206     spin_lock_bh(&np->np_thread_lock);
0207     if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
0208         spin_unlock_bh(&np->np_thread_lock);
0209         return -1;
0210     }
0211     spin_unlock_bh(&np->np_thread_lock);
0212     /*
0213      * Determine if the portal group is accepting storage traffic.
0214      */
0215     spin_lock_bh(&tpg->tpg_state_lock);
0216     if (tpg->tpg_state != TPG_STATE_ACTIVE) {
0217         spin_unlock_bh(&tpg->tpg_state_lock);
0218         return -1;
0219     }
0220     spin_unlock_bh(&tpg->tpg_state_lock);
0221
0222     /*
0223      * Here we serialize access across the TIQN+TPG Tuple.
0224      */
0225     ret = down_interruptible(&tpg->np_login_sem);
0226     if (ret != 0)
0227         return -1;
0228
0229     spin_lock_bh(&tpg->tpg_state_lock);
0230     if (tpg->tpg_state != TPG_STATE_ACTIVE) {
0231         spin_unlock_bh(&tpg->tpg_state_lock);
0232         up(&tpg->np_login_sem);
0233         return -1;
0234     }
0235     spin_unlock_bh(&tpg->tpg_state_lock);
0236
0237     return 0;
0238 }
0239
0240 void iscsit_login_kref_put(struct kref *kref)
0241 {
0242     struct iscsi_tpg_np *tpg_np = container_of(kref,
0243                 struct iscsi_tpg_np, tpg_np_kref);
0244
0245     complete(&tpg_np->tpg_np_comp);
0246 }
0247
0248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
0249                struct iscsi_tpg_np *tpg_np)
0250 {
0251     struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
0252
0253     up(&tpg->np_login_sem);
0254
0255     if (tpg_np)
0256         kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
0257
0258     if (tiqn)
0259         iscsit_put_tiqn_for_login(tiqn);
0260
0261     return 0;
0262 }
0263
0264 bool iscsit_check_np_match(
0265     struct sockaddr_storage *sockaddr,
0266     struct iscsi_np *np,
0267     int network_transport)
0268 {
0269     struct sockaddr_in *sock_in, *sock_in_e;
0270     struct sockaddr_in6 *sock_in6, *sock_in6_e;
0271     bool ip_match = false;
0272     u16 port, port_e;
0273
0274     if (sockaddr->ss_family == AF_INET6) {
0275         sock_in6 = (struct sockaddr_in6 *)sockaddr;
0276         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
0277
0278         if (!memcmp(&sock_in6->sin6_addr.in6_u,
0279                 &sock_in6_e->sin6_addr.in6_u,
0280                 sizeof(struct in6_addr)))
0281             ip_match = true;
0282
0283         port = ntohs(sock_in6->sin6_port);
0284         port_e = ntohs(sock_in6_e->sin6_port);
0285     } else {
0286         sock_in = (struct sockaddr_in *)sockaddr;
0287         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
0288
0289         if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
0290             ip_match = true;
0291
0292         port = ntohs(sock_in->sin_port);
0293         port_e = ntohs(sock_in_e->sin_port);
0294     }
0295
0296     if (ip_match && (port_e == port) &&
0297         (np->np_network_transport == network_transport))
0298         return true;
0299
0300     return false;
0301 }
0302
0303 static struct iscsi_np *iscsit_get_np(
0304     struct sockaddr_storage *sockaddr,
0305     int network_transport)
0306 {
0307     struct iscsi_np *np;
0308     bool match;
0309
0310     lockdep_assert_held(&np_lock);
0311
0312     list_for_each_entry(np, &g_np_list, np_list) {
0313         spin_lock_bh(&np->np_thread_lock);
0314         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
0315             spin_unlock_bh(&np->np_thread_lock);
0316             continue;
0317         }
0318
0319         match = iscsit_check_np_match(sockaddr, np, network_transport);
0320         if (match) {
0321             /*
0322              * Increment the np_exports reference count now to
0323              * prevent iscsit_del_np() below from being called
0324              * while iscsi_tpg_add_network_portal() is called.
0325              */
0326             np->np_exports++;
0327             spin_unlock_bh(&np->np_thread_lock);
0328             return np;
0329         }
0330         spin_unlock_bh(&np->np_thread_lock);
0331     }
0332
0333     return NULL;
0334 }
0335
0336 struct iscsi_np *iscsit_add_np(
0337     struct sockaddr_storage *sockaddr,
0338     int network_transport)
0339 {
0340     struct iscsi_np *np;
0341     int ret;
0342
0343     mutex_lock(&np_lock);
0344
0345     /*
0346      * Locate the existing struct iscsi_np if already active..
0347      */
0348     np = iscsit_get_np(sockaddr, network_transport);
0349     if (np) {
0350         mutex_unlock(&np_lock);
0351         return np;
0352     }
0353
0354     np = kzalloc(sizeof(*np), GFP_KERNEL);
0355     if (!np) {
0356         mutex_unlock(&np_lock);
0357         return ERR_PTR(-ENOMEM);
0358     }
0359
0360     np->np_flags |= NPF_IP_NETWORK;
0361     np->np_network_transport = network_transport;
0362     spin_lock_init(&np->np_thread_lock);
0363     init_completion(&np->np_restart_comp);
0364     INIT_LIST_HEAD(&np->np_list);
0365
0366     timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
0367
0368     ret = iscsi_target_setup_login_socket(np, sockaddr);
0369     if (ret != 0) {
0370         kfree(np);
0371         mutex_unlock(&np_lock);
0372         return ERR_PTR(ret);
0373     }
0374
0375     np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
0376     if (IS_ERR(np->np_thread)) {
0377         pr_err("Unable to create kthread: iscsi_np\n");
0378         ret = PTR_ERR(np->np_thread);
0379         kfree(np);
0380         mutex_unlock(&np_lock);
0381         return ERR_PTR(ret);
0382     }
0383     /*
0384      * Increment the np_exports reference count now to prevent
0385      * iscsit_del_np() below from being run while a new call to
0386      * iscsi_tpg_add_network_portal() for a matching iscsi_np is
0387      * active.  We don't need to hold np->np_thread_lock at this
0388      * point because iscsi_np has not been added to g_np_list yet.
0389      */
0390     np->np_exports = 1;
0391     np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
0392
0393     list_add_tail(&np->np_list, &g_np_list);
0394     mutex_unlock(&np_lock);
0395
0396     pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
0397         &np->np_sockaddr, np->np_transport->name);
0398
0399     return np;
0400 }
0401
0402 int iscsit_reset_np_thread(
0403     struct iscsi_np *np,
0404     struct iscsi_tpg_np *tpg_np,
0405     struct iscsi_portal_group *tpg,
0406     bool shutdown)
0407 {
0408     spin_lock_bh(&np->np_thread_lock);
0409     if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
0410         spin_unlock_bh(&np->np_thread_lock);
0411         return 0;
0412     }
0413     np->np_thread_state = ISCSI_NP_THREAD_RESET;
0414     atomic_inc(&np->np_reset_count);
0415
0416     if (np->np_thread) {
0417         spin_unlock_bh(&np->np_thread_lock);
0418         send_sig(SIGINT, np->np_thread, 1);
0419         wait_for_completion(&np->np_restart_comp);
0420         spin_lock_bh(&np->np_thread_lock);
0421     }
0422     spin_unlock_bh(&np->np_thread_lock);
0423
0424     if (tpg_np && shutdown) {
0425         kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
0426
0427         wait_for_completion(&tpg_np->tpg_np_comp);
0428     }
0429
0430     return 0;
0431 }
0432
0433 static void iscsit_free_np(struct iscsi_np *np)
0434 {
0435     if (np->np_socket)
0436         sock_release(np->np_socket);
0437 }
0438
0439 int iscsit_del_np(struct iscsi_np *np)
0440 {
0441     spin_lock_bh(&np->np_thread_lock);
0442     np->np_exports--;
0443     if (np->np_exports) {
0444         np->enabled = true;
0445         spin_unlock_bh(&np->np_thread_lock);
0446         return 0;
0447     }
0448     np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
0449     spin_unlock_bh(&np->np_thread_lock);
0450
0451     if (np->np_thread) {
0452         /*
0453          * We need to send the signal to wakeup Linux/Net
0454          * which may be sleeping in sock_accept()..
0455          */
0456         send_sig(SIGINT, np->np_thread, 1);
0457         kthread_stop(np->np_thread);
0458         np->np_thread = NULL;
0459     }
0460
0461     np->np_transport->iscsit_free_np(np);
0462
0463     mutex_lock(&np_lock);
0464     list_del(&np->np_list);
0465     mutex_unlock(&np_lock);
0466
0467     pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
0468         &np->np_sockaddr, np->np_transport->name);
0469
0470     iscsit_put_transport(np->np_transport);
0471     kfree(np);
0472     return 0;
0473 }
0474
0475 static void iscsit_get_rx_pdu(struct iscsit_conn *);
0476
0477 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
0478 {
0479     return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
0480 }
0481 EXPORT_SYMBOL(iscsit_queue_rsp);
0482
0483 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
0484 {
0485     spin_lock_bh(&conn->cmd_lock);
0486     if (!list_empty(&cmd->i_conn_node))
0487         list_del_init(&cmd->i_conn_node);
0488     spin_unlock_bh(&conn->cmd_lock);
0489
0490     __iscsit_free_cmd(cmd, true);
0491 }
0492 EXPORT_SYMBOL(iscsit_aborted_task);
0493
0494 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
0495                       u32, u32, const void *, void *);
0496 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *);
0497
0498 static int
0499 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
0500               const void *data_buf, u32 data_buf_len)
0501 {
0502     struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
0503     struct kvec *iov;
0504     u32 niov = 0, tx_size = ISCSI_HDR_LEN;
0505     int ret;
0506
0507     iov = &cmd->iov_misc[0];
0508     iov[niov].iov_base  = cmd->pdu;
0509     iov[niov++].iov_len = ISCSI_HDR_LEN;
0510
0511     if (conn->conn_ops->HeaderDigest) {
0512         u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
0513
0514         iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
0515                       ISCSI_HDR_LEN, 0, NULL,
0516                       header_digest);
0517
0518         iov[0].iov_len += ISCSI_CRC_LEN;
0519         tx_size += ISCSI_CRC_LEN;
0520         pr_debug("Attaching CRC32C HeaderDigest"
0521              " to opcode 0x%x 0x%08x\n",
0522              hdr->opcode, *header_digest);
0523     }
0524
0525     if (data_buf_len) {
0526         u32 padding = ((-data_buf_len) & 3);
0527
0528         iov[niov].iov_base  = (void *)data_buf;
0529         iov[niov++].iov_len = data_buf_len;
0530         tx_size += data_buf_len;
0531
0532         if (padding != 0) {
0533             iov[niov].iov_base = &cmd->pad_bytes;
0534             iov[niov++].iov_len = padding;
0535             tx_size += padding;
0536             pr_debug("Attaching %u additional"
0537                  " padding bytes.\n", padding);
0538         }
0539
0540         if (conn->conn_ops->DataDigest) {
0541             iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
0542                           data_buf, data_buf_len,
0543                           padding, &cmd->pad_bytes,
0544                           &cmd->data_crc);
0545
0546             iov[niov].iov_base = &cmd->data_crc;
0547             iov[niov++].iov_len = ISCSI_CRC_LEN;
0548             tx_size += ISCSI_CRC_LEN;
0549             pr_debug("Attached DataDigest for %u"
0550                  " bytes opcode 0x%x, CRC 0x%08x\n",
0551                  data_buf_len, hdr->opcode, cmd->data_crc);
0552         }
0553     }
0554
0555     cmd->iov_misc_count = niov;
0556     cmd->tx_size = tx_size;
0557
0558     ret = iscsit_send_tx_data(cmd, conn, 1);
0559     if (ret < 0) {
0560         iscsit_tx_thread_wait_for_tcp(conn);
0561         return ret;
0562     }
0563
0564     return 0;
0565 }
0566
0567 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
0568                 u32 data_offset, u32 data_length);
0569 static void iscsit_unmap_iovec(struct iscsit_cmd *);
0570 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *,
0571                     u32, u32, u32, u8 *);
0572 static int
0573 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
0574                const struct iscsi_datain *datain)
0575 {
0576     struct kvec *iov;
0577     u32 iov_count = 0, tx_size = 0;
0578     int ret, iov_ret;
0579
0580     iov = &cmd->iov_data[0];
0581     iov[iov_count].iov_base = cmd->pdu;
0582     iov[iov_count++].iov_len = ISCSI_HDR_LEN;
0583     tx_size += ISCSI_HDR_LEN;
0584
0585     if (conn->conn_ops->HeaderDigest) {
0586         u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
0587
0588         iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
0589                       ISCSI_HDR_LEN, 0, NULL,
0590                       header_digest);
0591
0592         iov[0].iov_len += ISCSI_CRC_LEN;
0593         tx_size += ISCSI_CRC_LEN;
0594
0595         pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
0596              *header_digest);
0597     }
0598
0599     iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
0600                    cmd->orig_iov_data_count - (iov_count + 2),
0601                    datain->offset, datain->length);
0602     if (iov_ret < 0)
0603         return -1;
0604
0605     iov_count += iov_ret;
0606     tx_size += datain->length;
0607
0608     cmd->padding = ((-datain->length) & 3);
0609     if (cmd->padding) {
0610         iov[iov_count].iov_base     = cmd->pad_bytes;
0611         iov[iov_count++].iov_len    = cmd->padding;
0612         tx_size += cmd->padding;
0613
0614         pr_debug("Attaching %u padding bytes\n", cmd->padding);
0615     }
0616
0617     if (conn->conn_ops->DataDigest) {
0618         cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
0619                              cmd, datain->offset,
0620                              datain->length,
0621                              cmd->padding,
0622                              cmd->pad_bytes);
0623
0624         iov[iov_count].iov_base = &cmd->data_crc;
0625         iov[iov_count++].iov_len = ISCSI_CRC_LEN;
0626         tx_size += ISCSI_CRC_LEN;
0627
0628         pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
0629              datain->length + cmd->padding, cmd->data_crc);
0630     }
0631
0632     cmd->iov_data_count = iov_count;
0633     cmd->tx_size = tx_size;
0634
0635     ret = iscsit_fe_sendpage_sg(cmd, conn);
0636
0637     iscsit_unmap_iovec(cmd);
0638
0639     if (ret < 0) {
0640         iscsit_tx_thread_wait_for_tcp(conn);
0641         return ret;
0642     }
0643
0644     return 0;
0645 }
0646
0647 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
0648                struct iscsi_datain_req *dr, const void *buf,
0649                u32 buf_len)
0650 {
0651     if (dr)
0652         return iscsit_xmit_datain_pdu(conn, cmd, buf);
0653     else
0654         return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
0655 }
0656
0657 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn)
0658 {
0659     return TARGET_PROT_NORMAL;
0660 }
0661
0662 static struct iscsit_transport iscsi_target_transport = {
0663     .name           = "iSCSI/TCP",
0664     .transport_type     = ISCSI_TCP,
0665     .rdma_shutdown      = false,
0666     .owner          = NULL,
0667     .iscsit_setup_np    = iscsit_setup_np,
0668     .iscsit_accept_np   = iscsit_accept_np,
0669     .iscsit_free_np     = iscsit_free_np,
0670     .iscsit_get_login_rx    = iscsit_get_login_rx,
0671     .iscsit_put_login_tx    = iscsit_put_login_tx,
0672     .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
0673     .iscsit_immediate_queue = iscsit_immediate_queue,
0674     .iscsit_response_queue  = iscsit_response_queue,
0675     .iscsit_queue_data_in   = iscsit_queue_rsp,
0676     .iscsit_queue_status    = iscsit_queue_rsp,
0677     .iscsit_aborted_task    = iscsit_aborted_task,
0678     .iscsit_xmit_pdu    = iscsit_xmit_pdu,
0679     .iscsit_get_rx_pdu  = iscsit_get_rx_pdu,
0680     .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
0681 };
0682
0683 static int __init iscsi_target_init_module(void)
0684 {
0685     int ret = 0, size;
0686
0687     pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
0688     iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
0689     if (!iscsit_global)
0690         return -1;
0691
0692     spin_lock_init(&iscsit_global->ts_bitmap_lock);
0693     mutex_init(&auth_id_lock);
0694     idr_init(&tiqn_idr);
0695
0696     ret = target_register_template(&iscsi_ops);
0697     if (ret)
0698         goto out;
0699
0700     size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
0701     iscsit_global->ts_bitmap = vzalloc(size);
0702     if (!iscsit_global->ts_bitmap)
0703         goto configfs_out;
0704
0705     if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) {
0706         pr_err("Unable to allocate iscsit_global->allowed_cpumask\n");
0707         goto bitmap_out;
0708     }
0709     cpumask_setall(iscsit_global->allowed_cpumask);
0710
0711     lio_qr_cache = kmem_cache_create("lio_qr_cache",
0712             sizeof(struct iscsi_queue_req),
0713             __alignof__(struct iscsi_queue_req), 0, NULL);
0714     if (!lio_qr_cache) {
0715         pr_err("Unable to kmem_cache_create() for"
0716                 " lio_qr_cache\n");
0717         goto cpumask_out;
0718     }
0719
0720     lio_dr_cache = kmem_cache_create("lio_dr_cache",
0721             sizeof(struct iscsi_datain_req),
0722             __alignof__(struct iscsi_datain_req), 0, NULL);
0723     if (!lio_dr_cache) {
0724         pr_err("Unable to kmem_cache_create() for"
0725                 " lio_dr_cache\n");
0726         goto qr_out;
0727     }
0728
0729     lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
0730             sizeof(struct iscsi_ooo_cmdsn),
0731             __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
0732     if (!lio_ooo_cache) {
0733         pr_err("Unable to kmem_cache_create() for"
0734                 " lio_ooo_cache\n");
0735         goto dr_out;
0736     }
0737
0738     lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
0739             sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
0740             0, NULL);
0741     if (!lio_r2t_cache) {
0742         pr_err("Unable to kmem_cache_create() for"
0743                 " lio_r2t_cache\n");
0744         goto ooo_out;
0745     }
0746
0747     iscsit_register_transport(&iscsi_target_transport);
0748
0749     if (iscsit_load_discovery_tpg() < 0)
0750         goto r2t_out;
0751
0752     return ret;
0753 r2t_out:
0754     iscsit_unregister_transport(&iscsi_target_transport);
0755     kmem_cache_destroy(lio_r2t_cache);
0756 ooo_out:
0757     kmem_cache_destroy(lio_ooo_cache);
0758 dr_out:
0759     kmem_cache_destroy(lio_dr_cache);
0760 qr_out:
0761     kmem_cache_destroy(lio_qr_cache);
0762 cpumask_out:
0763     free_cpumask_var(iscsit_global->allowed_cpumask);
0764 bitmap_out:
0765     vfree(iscsit_global->ts_bitmap);
0766 configfs_out:
0767     /* XXX: this probably wants it to be it's own unwind step.. */
0768     if (iscsit_global->discovery_tpg)
0769         iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
0770     target_unregister_template(&iscsi_ops);
0771 out:
0772     kfree(iscsit_global);
0773     return -ENOMEM;
0774 }
0775
0776 static void __exit iscsi_target_cleanup_module(void)
0777 {
0778     iscsit_release_discovery_tpg();
0779     iscsit_unregister_transport(&iscsi_target_transport);
0780     kmem_cache_destroy(lio_qr_cache);
0781     kmem_cache_destroy(lio_dr_cache);
0782     kmem_cache_destroy(lio_ooo_cache);
0783     kmem_cache_destroy(lio_r2t_cache);
0784
0785     /*
0786      * Shutdown discovery sessions and disable discovery TPG
0787      */
0788     if (iscsit_global->discovery_tpg)
0789         iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
0790
0791     target_unregister_template(&iscsi_ops);
0792
0793     free_cpumask_var(iscsit_global->allowed_cpumask);
0794     vfree(iscsit_global->ts_bitmap);
0795     kfree(iscsit_global);
0796 }
0797
0798 int iscsit_add_reject(
0799     struct iscsit_conn *conn,
0800     u8 reason,
0801     unsigned char *buf)
0802 {
0803     struct iscsit_cmd *cmd;
0804
0805     cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
0806     if (!cmd)
0807         return -1;
0808
0809     cmd->iscsi_opcode = ISCSI_OP_REJECT;
0810     cmd->reject_reason = reason;
0811
0812     cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
0813     if (!cmd->buf_ptr) {
0814         pr_err("Unable to allocate memory for cmd->buf_ptr\n");
0815         iscsit_free_cmd(cmd, false);
0816         return -1;
0817     }
0818
0819     spin_lock_bh(&conn->cmd_lock);
0820     list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
0821     spin_unlock_bh(&conn->cmd_lock);
0822
0823     cmd->i_state = ISTATE_SEND_REJECT;
0824     iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
0825
0826     return -1;
0827 }
0828 EXPORT_SYMBOL(iscsit_add_reject);
0829
0830 static int iscsit_add_reject_from_cmd(
0831     struct iscsit_cmd *cmd,
0832     u8 reason,
0833     bool add_to_conn,
0834     unsigned char *buf)
0835 {
0836     struct iscsit_conn *conn;
0837     const bool do_put = cmd->se_cmd.se_tfo != NULL;
0838
0839     if (!cmd->conn) {
0840         pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
0841                 cmd->init_task_tag);
0842         return -1;
0843     }
0844     conn = cmd->conn;
0845
0846     cmd->iscsi_opcode = ISCSI_OP_REJECT;
0847     cmd->reject_reason = reason;
0848
0849     cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
0850     if (!cmd->buf_ptr) {
0851         pr_err("Unable to allocate memory for cmd->buf_ptr\n");
0852         iscsit_free_cmd(cmd, false);
0853         return -1;
0854     }
0855
0856     if (add_to_conn) {
0857         spin_lock_bh(&conn->cmd_lock);
0858         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
0859         spin_unlock_bh(&conn->cmd_lock);
0860     }
0861
0862     cmd->i_state = ISTATE_SEND_REJECT;
0863     iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
0864     /*
0865      * Perform the kref_put now if se_cmd has already been setup by
0866      * scsit_setup_scsi_cmd()
0867      */
0868     if (do_put) {
0869         pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
0870         target_put_sess_cmd(&cmd->se_cmd);
0871     }
0872     return -1;
0873 }
0874
0875 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason,
0876                  unsigned char *buf)
0877 {
0878     return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
0879 }
0880
0881 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf)
0882 {
0883     return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
0884 }
0885 EXPORT_SYMBOL(iscsit_reject_cmd);
0886
0887 /*
0888  * Map some portion of the allocated scatterlist to an iovec, suitable for
0889  * kernel sockets to copy data in/out.
0890  */
0891 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
0892                 u32 data_offset, u32 data_length)
0893 {
0894     u32 i = 0, orig_data_length = data_length;
0895     struct scatterlist *sg;
0896     unsigned int page_off;
0897
0898     /*
0899      * We know each entry in t_data_sg contains a page.
0900      */
0901     u32 ent = data_offset / PAGE_SIZE;
0902
0903     if (!data_length)
0904         return 0;
0905
0906     if (ent >= cmd->se_cmd.t_data_nents) {
0907         pr_err("Initial page entry out-of-bounds\n");
0908         goto overflow;
0909     }
0910
0911     sg = &cmd->se_cmd.t_data_sg[ent];
0912     page_off = (data_offset % PAGE_SIZE);
0913
0914     cmd->first_data_sg = sg;
0915     cmd->first_data_sg_off = page_off;
0916
0917     while (data_length) {
0918         u32 cur_len;
0919
0920         if (WARN_ON_ONCE(!sg || i >= nvec))
0921             goto overflow;
0922
0923         cur_len = min_t(u32, data_length, sg->length - page_off);
0924
0925         iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
0926         iov[i].iov_len = cur_len;
0927
0928         data_length -= cur_len;
0929         page_off = 0;
0930         sg = sg_next(sg);
0931         i++;
0932     }
0933
0934     cmd->kmapped_nents = i;
0935
0936     return i;
0937
0938 overflow:
0939     pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
0940            data_offset, orig_data_length, i, nvec);
0941     for_each_sg(cmd->se_cmd.t_data_sg, sg,
0942             cmd->se_cmd.t_data_nents, i) {
0943         pr_err("[%d] off %d len %d\n",
0944                i, sg->offset, sg->length);
0945     }
0946     return -1;
0947 }
0948
0949 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd)
0950 {
0951     u32 i;
0952     struct scatterlist *sg;
0953
0954     sg = cmd->first_data_sg;
0955
0956     for (i = 0; i < cmd->kmapped_nents; i++)
0957         kunmap(sg_page(&sg[i]));
0958 }
0959
0960 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn)
0961 {
0962     LIST_HEAD(ack_list);
0963     struct iscsit_cmd *cmd, *cmd_p;
0964
0965     conn->exp_statsn = exp_statsn;
0966
0967     if (conn->sess->sess_ops->RDMAExtensions)
0968         return;
0969
0970     spin_lock_bh(&conn->cmd_lock);
0971     list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
0972         spin_lock(&cmd->istate_lock);
0973         if ((cmd->i_state == ISTATE_SENT_STATUS) &&
0974             iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
0975             cmd->i_state = ISTATE_REMOVE;
0976             spin_unlock(&cmd->istate_lock);
0977             list_move_tail(&cmd->i_conn_node, &ack_list);
0978             continue;
0979         }
0980         spin_unlock(&cmd->istate_lock);
0981     }
0982     spin_unlock_bh(&conn->cmd_lock);
0983
0984     list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
0985         list_del_init(&cmd->i_conn_node);
0986         iscsit_free_cmd(cmd, false);
0987     }
0988 }
0989
0990 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd)
0991 {
0992     u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
0993
0994     iov_count += ISCSI_IOV_DATA_BUFFER;
0995     cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
0996     if (!cmd->iov_data)
0997         return -ENOMEM;
0998
0999     cmd->orig_iov_data_count = iov_count;
1000     return 0;
1001 }
1002
1003 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1004               unsigned char *buf)
1005 {
1006     int data_direction, payload_length;
1007     struct iscsi_ecdb_ahdr *ecdb_ahdr;
1008     struct iscsi_scsi_req *hdr;
1009     int iscsi_task_attr;
1010     unsigned char *cdb;
1011     int sam_task_attr;
1012
1013     atomic_long_inc(&conn->sess->cmd_pdus);
1014
1015     hdr         = (struct iscsi_scsi_req *) buf;
1016     payload_length      = ntoh24(hdr->dlength);
1017
1018     /* FIXME; Add checks for AdditionalHeaderSegment */
1019
1020     if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1021         !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1022         pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1023                 " not set. Bad iSCSI Initiator.\n");
1024         return iscsit_add_reject_cmd(cmd,
1025                          ISCSI_REASON_BOOKMARK_INVALID, buf);
1026     }
1027
1028     if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1029          (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1030         /*
1031          * From RFC-3720 Section 10.3.1:
1032          *
1033          * "Either or both of R and W MAY be 1 when either the
1034          *  Expected Data Transfer Length and/or Bidirectional Read
1035          *  Expected Data Transfer Length are 0"
1036          *
1037          * For this case, go ahead and clear the unnecssary bits
1038          * to avoid any confusion with ->data_direction.
1039          */
1040         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1041         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1042
1043         pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1044             " set when Expected Data Transfer Length is 0 for"
1045             " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1046     }
1047
1048     if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1049         !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1050         pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1051             " MUST be set if Expected Data Transfer Length is not 0."
1052             " Bad iSCSI Initiator\n");
1053         return iscsit_add_reject_cmd(cmd,
1054                          ISCSI_REASON_BOOKMARK_INVALID, buf);
1055     }
1056
1057     if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1058         (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1059         pr_err("Bidirectional operations not supported!\n");
1060         return iscsit_add_reject_cmd(cmd,
1061                          ISCSI_REASON_BOOKMARK_INVALID, buf);
1062     }
1063
1064     if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1065         pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1066                 " Scsi Command PDU.\n");
1067         return iscsit_add_reject_cmd(cmd,
1068                          ISCSI_REASON_BOOKMARK_INVALID, buf);
1069     }
1070
1071     if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1072         pr_err("ImmediateData=No but DataSegmentLength=%u,"
1073             " protocol error.\n", payload_length);
1074         return iscsit_add_reject_cmd(cmd,
1075                          ISCSI_REASON_PROTOCOL_ERROR, buf);
1076     }
1077
1078     if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1079         (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1080         pr_err("Expected Data Transfer Length and Length of"
1081             " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1082             " bit is not set protocol error\n");
1083         return iscsit_add_reject_cmd(cmd,
1084                          ISCSI_REASON_PROTOCOL_ERROR, buf);
1085     }
1086
1087     if (payload_length > be32_to_cpu(hdr->data_length)) {
1088         pr_err("DataSegmentLength: %u is greater than"
1089             " EDTL: %u, protocol error.\n", payload_length,
1090                 hdr->data_length);
1091         return iscsit_add_reject_cmd(cmd,
1092                          ISCSI_REASON_PROTOCOL_ERROR, buf);
1093     }
1094
1095     if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1096         pr_err("DataSegmentLength: %u is greater than"
1097             " MaxXmitDataSegmentLength: %u, protocol error.\n",
1098             payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1099         return iscsit_add_reject_cmd(cmd,
1100                          ISCSI_REASON_PROTOCOL_ERROR, buf);
1101     }
1102
1103     if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1104         pr_err("DataSegmentLength: %u is greater than"
1105             " FirstBurstLength: %u, protocol error.\n",
1106             payload_length, conn->sess->sess_ops->FirstBurstLength);
1107         return iscsit_add_reject_cmd(cmd,
1108                          ISCSI_REASON_BOOKMARK_INVALID, buf);
1109     }
1110
1111     cdb = hdr->cdb;
1112
1113     if (hdr->hlength) {
1114         ecdb_ahdr = (struct iscsi_ecdb_ahdr *) (hdr + 1);
1115         if (ecdb_ahdr->ahstype != ISCSI_AHSTYPE_CDB) {
1116             pr_err("Additional Header Segment type %d not supported!\n",
1117                    ecdb_ahdr->ahstype);
1118             return iscsit_add_reject_cmd(cmd,
1119                 ISCSI_REASON_CMD_NOT_SUPPORTED, buf);
1120         }
1121
1122         cdb = kmalloc(be16_to_cpu(ecdb_ahdr->ahslength) + 15,
1123                   GFP_KERNEL);
1124         if (cdb == NULL)
1125             return iscsit_add_reject_cmd(cmd,
1126                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1127         memcpy(cdb, hdr->cdb, ISCSI_CDB_SIZE);
1128         memcpy(cdb + ISCSI_CDB_SIZE, ecdb_ahdr->ecdb,
1129                be16_to_cpu(ecdb_ahdr->ahslength) - 1);
1130     }
1131
1132     data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1133              (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1134               DMA_NONE;
1135
1136     cmd->data_direction = data_direction;
1137     iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1138     /*
1139      * Figure out the SAM Task Attribute for the incoming SCSI CDB
1140      */
1141     if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1142         (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1143         sam_task_attr = TCM_SIMPLE_TAG;
1144     else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1145         sam_task_attr = TCM_ORDERED_TAG;
1146     else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1147         sam_task_attr = TCM_HEAD_TAG;
1148     else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1149         sam_task_attr = TCM_ACA_TAG;
1150     else {
1151         pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1152             " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1153         sam_task_attr = TCM_SIMPLE_TAG;
1154     }
1155
1156     cmd->iscsi_opcode   = ISCSI_OP_SCSI_CMD;
1157     cmd->i_state        = ISTATE_NEW_CMD;
1158     cmd->immediate_cmd  = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1159     cmd->immediate_data = (payload_length) ? 1 : 0;
1160     cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1161                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1162     if (cmd->unsolicited_data)
1163         cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1164
1165     conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1166     if (hdr->flags & ISCSI_FLAG_CMD_READ)
1167         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1168     else
1169         cmd->targ_xfer_tag = 0xFFFFFFFF;
1170     cmd->cmd_sn     = be32_to_cpu(hdr->cmdsn);
1171     cmd->exp_stat_sn    = be32_to_cpu(hdr->exp_statsn);
1172     cmd->first_burst_len    = payload_length;
1173
1174     if (!conn->sess->sess_ops->RDMAExtensions &&
1175          cmd->data_direction == DMA_FROM_DEVICE) {
1176         struct iscsi_datain_req *dr;
1177
1178         dr = iscsit_allocate_datain_req();
1179         if (!dr) {
1180             if (cdb != hdr->cdb)
1181                 kfree(cdb);
1182             return iscsit_add_reject_cmd(cmd,
1183                     ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184         }
1185
1186         iscsit_attach_datain_req(cmd, dr);
1187     }
1188
1189     /*
1190      * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1191      */
1192     __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
1193              conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1194              cmd->data_direction, sam_task_attr,
1195              cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
1196
1197     pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1198         " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1199         hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1200         conn->cid);
1201
1202     target_get_sess_cmd(&cmd->se_cmd, true);
1203
1204     cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1205     cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, cdb,
1206                         GFP_KERNEL);
1207
1208     if (cdb != hdr->cdb)
1209         kfree(cdb);
1210
1211     if (cmd->sense_reason) {
1212         if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1213             return iscsit_add_reject_cmd(cmd,
1214                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1215         }
1216
1217         goto attach_cmd;
1218     }
1219
1220     cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1221     if (cmd->sense_reason)
1222         goto attach_cmd;
1223
1224     cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1225     if (cmd->sense_reason)
1226         goto attach_cmd;
1227
1228     if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1229         return iscsit_add_reject_cmd(cmd,
1230                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1231     }
1232
1233 attach_cmd:
1234     spin_lock_bh(&conn->cmd_lock);
1235     list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1236     spin_unlock_bh(&conn->cmd_lock);
1237     /*
1238      * Check if we need to delay processing because of ALUA
1239      * Active/NonOptimized primary access state..
1240      */
1241     core_alua_check_nonop_delay(&cmd->se_cmd);
1242
1243     return 0;
1244 }
1245 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1246
1247 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd)
1248 {
1249     iscsit_set_dataout_sequence_values(cmd);
1250
1251     spin_lock_bh(&cmd->dataout_timeout_lock);
1252     iscsit_start_dataout_timer(cmd, cmd->conn);
1253     spin_unlock_bh(&cmd->dataout_timeout_lock);
1254 }
1255 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1256
1257 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1258                 struct iscsi_scsi_req *hdr)
1259 {
1260     int cmdsn_ret = 0;
1261     /*
1262      * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1263      * the Immediate Bit is not set, and no Immediate
1264      * Data is attached.
1265      *
1266      * A PDU/CmdSN carrying Immediate Data can only
1267      * be processed after the DataCRC has passed.
1268      * If the DataCRC fails, the CmdSN MUST NOT
1269      * be acknowledged. (See below)
1270      */
1271     if (!cmd->immediate_data) {
1272         cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1273                     (unsigned char *)hdr, hdr->cmdsn);
1274         if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1275             return -1;
1276         else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1277             target_put_sess_cmd(&cmd->se_cmd);
1278             return 0;
1279         }
1280     }
1281
1282     iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1283
1284     /*
1285      * If no Immediate Data is attached, it's OK to return now.
1286      */
1287     if (!cmd->immediate_data) {
1288         if (!cmd->sense_reason && cmd->unsolicited_data)
1289             iscsit_set_unsolicited_dataout(cmd);
1290         if (!cmd->sense_reason)
1291             return 0;
1292
1293         target_put_sess_cmd(&cmd->se_cmd);
1294         return 0;
1295     }
1296
1297     /*
1298      * Early CHECK_CONDITIONs with ImmediateData never make it to command
1299      * execution.  These exceptions are processed in CmdSN order using
1300      * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1301      */
1302     if (cmd->sense_reason)
1303         return 1;
1304     /*
1305      * Call directly into transport_generic_new_cmd() to perform
1306      * the backend memory allocation.
1307      */
1308     cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1309     if (cmd->sense_reason)
1310         return 1;
1311
1312     return 0;
1313 }
1314 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1315
1316 static int
1317 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr,
1318               bool dump_payload)
1319 {
1320     int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1321     int rc;
1322
1323     /*
1324      * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1325      */
1326     if (dump_payload) {
1327         u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1328                  cmd->first_burst_len);
1329
1330         pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1331              cmd->se_cmd.data_length, cmd->write_data_done,
1332              cmd->first_burst_len, length);
1333         rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1334         pr_debug("Finished dumping immediate data\n");
1335         if (rc < 0)
1336             immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1337     } else {
1338         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1339                              cmd->first_burst_len);
1340     }
1341
1342     if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1343         /*
1344          * A PDU/CmdSN carrying Immediate Data passed
1345          * DataCRC, check against ExpCmdSN/MaxCmdSN if
1346          * Immediate Bit is not set.
1347          */
1348         cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1349                     (unsigned char *)hdr, hdr->cmdsn);
1350         if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1351             return -1;
1352
1353         if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1354             target_put_sess_cmd(&cmd->se_cmd);
1355
1356             return 0;
1357         } else if (cmd->unsolicited_data)
1358             iscsit_set_unsolicited_dataout(cmd);
1359
1360     } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1361         /*
1362          * Immediate Data failed DataCRC and ERL>=1,
1363          * silently drop this PDU and let the initiator
1364          * plug the CmdSN gap.
1365          *
1366          * FIXME: Send Unsolicited NOPIN with reserved
1367          * TTT here to help the initiator figure out
1368          * the missing CmdSN, although they should be
1369          * intelligent enough to determine the missing
1370          * CmdSN and issue a retry to plug the sequence.
1371          */
1372         cmd->i_state = ISTATE_REMOVE;
1373         iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1374     } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1375         return -1;
1376
1377     return 0;
1378 }
1379
1380 static int
1381 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1382                unsigned char *buf)
1383 {
1384     struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1385     int rc, immed_data;
1386     bool dump_payload = false;
1387
1388     rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1389     if (rc < 0)
1390         return 0;
1391     /*
1392      * Allocation iovecs needed for struct socket operations for
1393      * traditional iSCSI block I/O.
1394      */
1395     if (iscsit_allocate_iovecs(cmd) < 0) {
1396         return iscsit_reject_cmd(cmd,
1397                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1398     }
1399     immed_data = cmd->immediate_data;
1400
1401     rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1402     if (rc < 0)
1403         return rc;
1404     else if (rc > 0)
1405         dump_payload = true;
1406
1407     if (!immed_data)
1408         return 0;
1409
1410     return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1411 }
1412
1413 static u32 iscsit_do_crypto_hash_sg(
1414     struct ahash_request *hash,
1415     struct iscsit_cmd *cmd,
1416     u32 data_offset,
1417     u32 data_length,
1418     u32 padding,
1419     u8 *pad_bytes)
1420 {
1421     u32 data_crc;
1422     struct scatterlist *sg;
1423     unsigned int page_off;
1424
1425     crypto_ahash_init(hash);
1426
1427     sg = cmd->first_data_sg;
1428     page_off = cmd->first_data_sg_off;
1429
1430     if (data_length && page_off) {
1431         struct scatterlist first_sg;
1432         u32 len = min_t(u32, data_length, sg->length - page_off);
1433
1434         sg_init_table(&first_sg, 1);
1435         sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1436
1437         ahash_request_set_crypt(hash, &first_sg, NULL, len);
1438         crypto_ahash_update(hash);
1439
1440         data_length -= len;
1441         sg = sg_next(sg);
1442     }
1443
1444     while (data_length) {
1445         u32 cur_len = min_t(u32, data_length, sg->length);
1446
1447         ahash_request_set_crypt(hash, sg, NULL, cur_len);
1448         crypto_ahash_update(hash);
1449
1450         data_length -= cur_len;
1451         /* iscsit_map_iovec has already checked for invalid sg pointers */
1452         sg = sg_next(sg);
1453     }
1454
1455     if (padding) {
1456         struct scatterlist pad_sg;
1457
1458         sg_init_one(&pad_sg, pad_bytes, padding);
1459         ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1460                     padding);
1461         crypto_ahash_finup(hash);
1462     } else {
1463         ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1464         crypto_ahash_final(hash);
1465     }
1466
1467     return data_crc;
1468 }
1469
1470 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1471     const void *buf, u32 payload_length, u32 padding,
1472     const void *pad_bytes, void *data_crc)
1473 {
1474     struct scatterlist sg[2];
1475
1476     sg_init_table(sg, ARRAY_SIZE(sg));
1477     sg_set_buf(sg, buf, payload_length);
1478     if (padding)
1479         sg_set_buf(sg + 1, pad_bytes, padding);
1480
1481     ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1482
1483     crypto_ahash_digest(hash);
1484 }
1485
1486 int
1487 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1488                struct iscsit_cmd *cmd, u32 payload_length,
1489                bool *success)
1490 {
1491     struct iscsi_data *hdr = buf;
1492     struct se_cmd *se_cmd;
1493     int rc;
1494
1495     /* iSCSI write */
1496     atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1497
1498     pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1499         " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1500         hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1501         payload_length, conn->cid);
1502
1503     if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1504         pr_err("Command ITT: 0x%08x received DataOUT after"
1505             " last DataOUT received, dumping payload\n",
1506             cmd->init_task_tag);
1507         return iscsit_dump_data_payload(conn, payload_length, 1);
1508     }
1509
1510     if (cmd->data_direction != DMA_TO_DEVICE) {
1511         pr_err("Command ITT: 0x%08x received DataOUT for a"
1512             " NON-WRITE command.\n", cmd->init_task_tag);
1513         return iscsit_dump_data_payload(conn, payload_length, 1);
1514     }
1515     se_cmd = &cmd->se_cmd;
1516     iscsit_mod_dataout_timer(cmd);
1517
1518     if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1519         pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1520                be32_to_cpu(hdr->offset), payload_length,
1521                cmd->se_cmd.data_length);
1522         return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1523     }
1524
1525     if (cmd->unsolicited_data) {
1526         int dump_unsolicited_data = 0;
1527
1528         if (conn->sess->sess_ops->InitialR2T) {
1529             pr_err("Received unexpected unsolicited data"
1530                 " while InitialR2T=Yes, protocol error.\n");
1531             transport_send_check_condition_and_sense(&cmd->se_cmd,
1532                     TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1533             return -1;
1534         }
1535         /*
1536          * Special case for dealing with Unsolicited DataOUT
1537          * and Unsupported SAM WRITE Opcodes and SE resource allocation
1538          * failures;
1539          */
1540
1541         /* Something's amiss if we're not in WRITE_PENDING state... */
1542         WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1543         if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1544             dump_unsolicited_data = 1;
1545
1546         if (dump_unsolicited_data) {
1547             /*
1548              * Check if a delayed TASK_ABORTED status needs to
1549              * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1550              * received with the unsolicited data out.
1551              */
1552             if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1553                 iscsit_stop_dataout_timer(cmd);
1554
1555             return iscsit_dump_data_payload(conn, payload_length, 1);
1556         }
1557     } else {
1558         /*
1559          * For the normal solicited data path:
1560          *
1561          * Check for a delayed TASK_ABORTED status and dump any
1562          * incoming data out payload if one exists.  Also, when the
1563          * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1564          * data out sequence, we decrement outstanding_r2ts.  Once
1565          * outstanding_r2ts reaches zero, go ahead and send the delayed
1566          * TASK_ABORTED status.
1567          */
1568         if (se_cmd->transport_state & CMD_T_ABORTED) {
1569             if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1570                 --cmd->outstanding_r2ts < 1)
1571                 iscsit_stop_dataout_timer(cmd);
1572
1573             return iscsit_dump_data_payload(conn, payload_length, 1);
1574         }
1575     }
1576     /*
1577      * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1578      * within-command recovery checks before receiving the payload.
1579      */
1580     rc = iscsit_check_pre_dataout(cmd, buf);
1581     if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1582         return 0;
1583     else if (rc == DATAOUT_CANNOT_RECOVER)
1584         return -1;
1585     *success = true;
1586     return 0;
1587 }
1588 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1589
1590 int
1591 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1592              struct iscsit_cmd **out_cmd)
1593 {
1594     struct iscsi_data *hdr = buf;
1595     struct iscsit_cmd *cmd;
1596     u32 payload_length = ntoh24(hdr->dlength);
1597     int rc;
1598     bool success = false;
1599
1600     if (!payload_length) {
1601         pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1602         return 0;
1603     }
1604
1605     if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1606         pr_err_ratelimited("DataSegmentLength: %u is greater than"
1607             " MaxXmitDataSegmentLength: %u\n", payload_length,
1608             conn->conn_ops->MaxXmitDataSegmentLength);
1609         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1610     }
1611
1612     cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1613     if (!cmd)
1614         return 0;
1615
1616     rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1617
1618     if (success)
1619         *out_cmd = cmd;
1620
1621     return rc;
1622 }
1623 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1624
1625 static int
1626 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1627            struct iscsi_data *hdr)
1628 {
1629     struct kvec *iov;
1630     u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1631     u32 payload_length;
1632     int iov_ret, data_crc_failed = 0;
1633
1634     payload_length = min_t(u32, cmd->se_cmd.data_length,
1635                    ntoh24(hdr->dlength));
1636     rx_size += payload_length;
1637     iov = &cmd->iov_data[0];
1638
1639     iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1640                    be32_to_cpu(hdr->offset), payload_length);
1641     if (iov_ret < 0)
1642         return -1;
1643
1644     iov_count += iov_ret;
1645
1646     padding = ((-payload_length) & 3);
1647     if (padding != 0) {
1648         iov[iov_count].iov_base = cmd->pad_bytes;
1649         iov[iov_count++].iov_len = padding;
1650         rx_size += padding;
1651         pr_debug("Receiving %u padding bytes.\n", padding);
1652     }
1653
1654     if (conn->conn_ops->DataDigest) {
1655         iov[iov_count].iov_base = &checksum;
1656         iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1657         rx_size += ISCSI_CRC_LEN;
1658     }
1659
1660     WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1661     rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1662
1663     iscsit_unmap_iovec(cmd);
1664
1665     if (rx_got != rx_size)
1666         return -1;
1667
1668     if (conn->conn_ops->DataDigest) {
1669         u32 data_crc;
1670
1671         data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1672                             be32_to_cpu(hdr->offset),
1673                             payload_length, padding,
1674                             cmd->pad_bytes);
1675
1676         if (checksum != data_crc) {
1677             pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1678                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1679                 " does not match computed 0x%08x\n",
1680                 hdr->itt, hdr->offset, payload_length,
1681                 hdr->datasn, checksum, data_crc);
1682             data_crc_failed = 1;
1683         } else {
1684             pr_debug("Got CRC32C DataDigest 0x%08x for"
1685                 " %u bytes of Data Out\n", checksum,
1686                 payload_length);
1687         }
1688     }
1689
1690     return data_crc_failed;
1691 }
1692
1693 int
1694 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1695                  bool data_crc_failed)
1696 {
1697     struct iscsit_conn *conn = cmd->conn;
1698     int rc, ooo_cmdsn;
1699     /*
1700      * Increment post receive data and CRC values or perform
1701      * within-command recovery.
1702      */
1703     rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1704     if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1705         return 0;
1706     else if (rc == DATAOUT_SEND_R2T) {
1707         iscsit_set_dataout_sequence_values(cmd);
1708         conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1709     } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1710         /*
1711          * Handle extra special case for out of order
1712          * Unsolicited Data Out.
1713          */
1714         spin_lock_bh(&cmd->istate_lock);
1715         ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1716         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1717         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1718         spin_unlock_bh(&cmd->istate_lock);
1719
1720         iscsit_stop_dataout_timer(cmd);
1721         if (ooo_cmdsn)
1722             return 0;
1723         target_execute_cmd(&cmd->se_cmd);
1724         return 0;
1725     } else /* DATAOUT_CANNOT_RECOVER */
1726         return -1;
1727
1728     return 0;
1729 }
1730 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1731
1732 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1733 {
1734     struct iscsit_cmd *cmd = NULL;
1735     struct iscsi_data *hdr = (struct iscsi_data *)buf;
1736     int rc;
1737     bool data_crc_failed = false;
1738
1739     rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1740     if (rc < 0)
1741         return 0;
1742     else if (!cmd)
1743         return 0;
1744
1745     rc = iscsit_get_dataout(conn, cmd, hdr);
1746     if (rc < 0)
1747         return rc;
1748     else if (rc > 0)
1749         data_crc_failed = true;
1750
1751     return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1752 }
1753
1754 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1755              struct iscsi_nopout *hdr)
1756 {
1757     u32 payload_length = ntoh24(hdr->dlength);
1758
1759     if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1760         pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1761         if (!cmd)
1762             return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1763                          (unsigned char *)hdr);
1764
1765         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1766                      (unsigned char *)hdr);
1767     }
1768
1769     if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1770         pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1771             " not set, protocol error.\n");
1772         if (!cmd)
1773             return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1774                          (unsigned char *)hdr);
1775
1776         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1777                      (unsigned char *)hdr);
1778     }
1779
1780     if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1781         pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1782             " greater than MaxXmitDataSegmentLength: %u, protocol"
1783             " error.\n", payload_length,
1784             conn->conn_ops->MaxXmitDataSegmentLength);
1785         if (!cmd)
1786             return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1787                          (unsigned char *)hdr);
1788
1789         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1790                      (unsigned char *)hdr);
1791     }
1792
1793     pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1794         " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1795         hdr->itt == RESERVED_ITT ? "Response" : "Request",
1796         hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1797         payload_length);
1798     /*
1799      * This is not a response to a Unsolicited NopIN, which means
1800      * it can either be a NOPOUT ping request (with a valid ITT),
1801      * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1802      * Either way, make sure we allocate an struct iscsit_cmd, as both
1803      * can contain ping data.
1804      */
1805     if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1806         cmd->iscsi_opcode   = ISCSI_OP_NOOP_OUT;
1807         cmd->i_state        = ISTATE_SEND_NOPIN;
1808         cmd->immediate_cmd  = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1809                         1 : 0);
1810         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1811         cmd->targ_xfer_tag  = 0xFFFFFFFF;
1812         cmd->cmd_sn     = be32_to_cpu(hdr->cmdsn);
1813         cmd->exp_stat_sn    = be32_to_cpu(hdr->exp_statsn);
1814         cmd->data_direction = DMA_NONE;
1815     }
1816
1817     return 0;
1818 }
1819 EXPORT_SYMBOL(iscsit_setup_nop_out);
1820
1821 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1822                struct iscsi_nopout *hdr)
1823 {
1824     struct iscsit_cmd *cmd_p = NULL;
1825     int cmdsn_ret = 0;
1826     /*
1827      * Initiator is expecting a NopIN ping reply..
1828      */
1829     if (hdr->itt != RESERVED_ITT) {
1830         if (!cmd)
1831             return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1832                         (unsigned char *)hdr);
1833
1834         spin_lock_bh(&conn->cmd_lock);
1835         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1836         spin_unlock_bh(&conn->cmd_lock);
1837
1838         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1839
1840         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1841             iscsit_add_cmd_to_response_queue(cmd, conn,
1842                              cmd->i_state);
1843             return 0;
1844         }
1845
1846         cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1847                 (unsigned char *)hdr, hdr->cmdsn);
1848                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1849             return 0;
1850         if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1851             return -1;
1852
1853         return 0;
1854     }
1855     /*
1856      * This was a response to a unsolicited NOPIN ping.
1857      */
1858     if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1859         cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1860         if (!cmd_p)
1861             return -EINVAL;
1862
1863         iscsit_stop_nopin_response_timer(conn);
1864
1865         cmd_p->i_state = ISTATE_REMOVE;
1866         iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1867
1868         iscsit_start_nopin_timer(conn);
1869         return 0;
1870     }
1871     /*
1872      * Otherwise, initiator is not expecting a NOPIN is response.
1873      * Just ignore for now.
1874      */
1875
1876     if (cmd)
1877         iscsit_free_cmd(cmd, false);
1878
1879         return 0;
1880 }
1881 EXPORT_SYMBOL(iscsit_process_nop_out);
1882
1883 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1884                  unsigned char *buf)
1885 {
1886     unsigned char *ping_data = NULL;
1887     struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1888     struct kvec *iov = NULL;
1889     u32 payload_length = ntoh24(hdr->dlength);
1890     int ret;
1891
1892     ret = iscsit_setup_nop_out(conn, cmd, hdr);
1893     if (ret < 0)
1894         return 0;
1895     /*
1896      * Handle NOP-OUT payload for traditional iSCSI sockets
1897      */
1898     if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1899         u32 checksum, data_crc, padding = 0;
1900         int niov = 0, rx_got, rx_size = payload_length;
1901
1902         ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1903         if (!ping_data) {
1904             ret = -1;
1905             goto out;
1906         }
1907
1908         iov = &cmd->iov_misc[0];
1909         iov[niov].iov_base  = ping_data;
1910         iov[niov++].iov_len = payload_length;
1911
1912         padding = ((-payload_length) & 3);
1913         if (padding != 0) {
1914             pr_debug("Receiving %u additional bytes"
1915                 " for padding.\n", padding);
1916             iov[niov].iov_base  = &cmd->pad_bytes;
1917             iov[niov++].iov_len = padding;
1918             rx_size += padding;
1919         }
1920         if (conn->conn_ops->DataDigest) {
1921             iov[niov].iov_base  = &checksum;
1922             iov[niov++].iov_len = ISCSI_CRC_LEN;
1923             rx_size += ISCSI_CRC_LEN;
1924         }
1925
1926         WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1927         rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1928         if (rx_got != rx_size) {
1929             ret = -1;
1930             goto out;
1931         }
1932
1933         if (conn->conn_ops->DataDigest) {
1934             iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1935                           payload_length, padding,
1936                           cmd->pad_bytes, &data_crc);
1937
1938             if (checksum != data_crc) {
1939                 pr_err("Ping data CRC32C DataDigest"
1940                 " 0x%08x does not match computed 0x%08x\n",
1941                     checksum, data_crc);
1942                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1943                     pr_err("Unable to recover from"
1944                     " NOPOUT Ping DataCRC failure while in"
1945                         " ERL=0.\n");
1946                     ret = -1;
1947                     goto out;
1948                 } else {
1949                     /*
1950                      * Silently drop this PDU and let the
1951                      * initiator plug the CmdSN gap.
1952                      */
1953                     pr_debug("Dropping NOPOUT"
1954                     " Command CmdSN: 0x%08x due to"
1955                     " DataCRC error.\n", hdr->cmdsn);
1956                     ret = 0;
1957                     goto out;
1958                 }
1959             } else {
1960                 pr_debug("Got CRC32C DataDigest"
1961                 " 0x%08x for %u bytes of ping data.\n",
1962                     checksum, payload_length);
1963             }
1964         }
1965
1966         ping_data[payload_length] = '\0';
1967         /*
1968          * Attach ping data to struct iscsit_cmd->buf_ptr.
1969          */
1970         cmd->buf_ptr = ping_data;
1971         cmd->buf_ptr_size = payload_length;
1972
1973         pr_debug("Got %u bytes of NOPOUT ping"
1974             " data.\n", payload_length);
1975         pr_debug("Ping Data: \"%s\"\n", ping_data);
1976     }
1977
1978     return iscsit_process_nop_out(conn, cmd, hdr);
1979 out:
1980     if (cmd)
1981         iscsit_free_cmd(cmd, false);
1982
1983     kfree(ping_data);
1984     return ret;
1985 }
1986
1987 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1988 {
1989     switch (iscsi_tmf) {
1990     case ISCSI_TM_FUNC_ABORT_TASK:
1991         return TMR_ABORT_TASK;
1992     case ISCSI_TM_FUNC_ABORT_TASK_SET:
1993         return TMR_ABORT_TASK_SET;
1994     case ISCSI_TM_FUNC_CLEAR_ACA:
1995         return TMR_CLEAR_ACA;
1996     case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1997         return TMR_CLEAR_TASK_SET;
1998     case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1999         return TMR_LUN_RESET;
2000     case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2001         return TMR_TARGET_WARM_RESET;
2002     case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2003         return TMR_TARGET_COLD_RESET;
2004     default:
2005         return TMR_UNKNOWN;
2006     }
2007 }
2008
2009 int
2010 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2011                unsigned char *buf)
2012 {
2013     struct se_tmr_req *se_tmr;
2014     struct iscsi_tmr_req *tmr_req;
2015     struct iscsi_tm *hdr;
2016     int out_of_order_cmdsn = 0, ret;
2017     u8 function, tcm_function = TMR_UNKNOWN;
2018
2019     hdr         = (struct iscsi_tm *) buf;
2020     hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2021     function = hdr->flags;
2022
2023     pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
2024         " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
2025         " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
2026         hdr->rtt, hdr->refcmdsn, conn->cid);
2027
2028     if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2029         ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2030          hdr->rtt != RESERVED_ITT)) {
2031         pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
2032         hdr->rtt = RESERVED_ITT;
2033     }
2034
2035     if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
2036             !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2037         pr_err("Task Management Request TASK_REASSIGN not"
2038             " issued as immediate command, bad iSCSI Initiator"
2039                 "implementation\n");
2040         return iscsit_add_reject_cmd(cmd,
2041                          ISCSI_REASON_PROTOCOL_ERROR, buf);
2042     }
2043     if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2044         be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2045         hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2046
2047     cmd->data_direction = DMA_NONE;
2048     cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2049     if (!cmd->tmr_req) {
2050         return iscsit_add_reject_cmd(cmd,
2051                          ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2052                          buf);
2053     }
2054
2055     __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2056               conn->sess->se_sess, 0, DMA_NONE,
2057               TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2058               scsilun_to_int(&hdr->lun));
2059
2060     target_get_sess_cmd(&cmd->se_cmd, true);
2061
2062     /*
2063      * TASK_REASSIGN for ERL=2 / connection stays inside of
2064      * LIO-Target $FABRIC_MOD
2065      */
2066     if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2067         tcm_function = iscsit_convert_tmf(function);
2068         if (tcm_function == TMR_UNKNOWN) {
2069             pr_err("Unknown iSCSI TMR Function:"
2070                    " 0x%02x\n", function);
2071             return iscsit_add_reject_cmd(cmd,
2072                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2073         }
2074     }
2075     ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2076                  GFP_KERNEL);
2077     if (ret < 0)
2078         return iscsit_add_reject_cmd(cmd,
2079                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2080
2081     cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2082
2083     cmd->iscsi_opcode   = ISCSI_OP_SCSI_TMFUNC;
2084     cmd->i_state        = ISTATE_SEND_TASKMGTRSP;
2085     cmd->immediate_cmd  = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2086     cmd->init_task_tag  = hdr->itt;
2087     cmd->targ_xfer_tag  = 0xFFFFFFFF;
2088     cmd->cmd_sn     = be32_to_cpu(hdr->cmdsn);
2089     cmd->exp_stat_sn    = be32_to_cpu(hdr->exp_statsn);
2090     se_tmr          = cmd->se_cmd.se_tmr_req;
2091     tmr_req         = cmd->tmr_req;
2092     /*
2093      * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2094      */
2095     if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2096         ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2097         if (ret < 0) {
2098             se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2099             goto attach;
2100         }
2101     }
2102
2103     switch (function) {
2104     case ISCSI_TM_FUNC_ABORT_TASK:
2105         se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2106         if (se_tmr->response)
2107             goto attach;
2108         break;
2109     case ISCSI_TM_FUNC_ABORT_TASK_SET:
2110     case ISCSI_TM_FUNC_CLEAR_ACA:
2111     case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2112     case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2113         break;
2114     case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2115         if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2116             se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2117             goto attach;
2118         }
2119         break;
2120     case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2121         if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2122             se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2123             goto attach;
2124         }
2125         break;
2126     case ISCSI_TM_FUNC_TASK_REASSIGN:
2127         se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2128         /*
2129          * Perform sanity checks on the ExpDataSN only if the
2130          * TASK_REASSIGN was successful.
2131          */
2132         if (se_tmr->response)
2133             break;
2134
2135         if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2136             return iscsit_add_reject_cmd(cmd,
2137                     ISCSI_REASON_BOOKMARK_INVALID, buf);
2138         break;
2139     default:
2140         pr_err("Unknown TMR function: 0x%02x, protocol"
2141             " error.\n", function);
2142         se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2143         goto attach;
2144     }
2145
2146     if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2147         (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2148         se_tmr->call_transport = 1;
2149 attach:
2150     spin_lock_bh(&conn->cmd_lock);
2151     list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2152     spin_unlock_bh(&conn->cmd_lock);
2153
2154     if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2155         int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2156         if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2157             out_of_order_cmdsn = 1;
2158         } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2159             target_put_sess_cmd(&cmd->se_cmd);
2160             return 0;
2161         } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2162             return -1;
2163         }
2164     }
2165     iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2166
2167     if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2168         return 0;
2169     /*
2170      * Found the referenced task, send to transport for processing.
2171      */
2172     if (se_tmr->call_transport)
2173         return transport_generic_handle_tmr(&cmd->se_cmd);
2174
2175     /*
2176      * Could not find the referenced LUN, task, or Task Management
2177      * command not authorized or supported.  Change state and
2178      * let the tx_thread send the response.
2179      *
2180      * For connection recovery, this is also the default action for
2181      * TMR TASK_REASSIGN.
2182      */
2183     iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2184     target_put_sess_cmd(&cmd->se_cmd);
2185     return 0;
2186 }
2187 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2188
2189 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2190 int
2191 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2192               struct iscsi_text *hdr)
2193 {
2194     u32 payload_length = ntoh24(hdr->dlength);
2195
2196     if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2197         pr_err("Unable to accept text parameter length: %u"
2198             "greater than MaxXmitDataSegmentLength %u.\n",
2199                payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2200         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2201                      (unsigned char *)hdr);
2202     }
2203
2204     if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2205          (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2206         pr_err("Multi sequence text commands currently not supported\n");
2207         return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2208                     (unsigned char *)hdr);
2209     }
2210
2211     pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2212         " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2213         hdr->exp_statsn, payload_length);
2214
2215     cmd->iscsi_opcode   = ISCSI_OP_TEXT;
2216     cmd->i_state        = ISTATE_SEND_TEXTRSP;
2217     cmd->immediate_cmd  = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2218     conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2219     cmd->targ_xfer_tag  = 0xFFFFFFFF;
2220     cmd->cmd_sn     = be32_to_cpu(hdr->cmdsn);
2221     cmd->exp_stat_sn    = be32_to_cpu(hdr->exp_statsn);
2222     cmd->data_direction = DMA_NONE;
2223     kfree(cmd->text_in_ptr);
2224     cmd->text_in_ptr    = NULL;
2225
2226     return 0;
2227 }
2228 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2229
2230 int
2231 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2232             struct iscsi_text *hdr)
2233 {
2234     unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2235     int cmdsn_ret;
2236
2237     if (!text_in) {
2238         cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2239         if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2240             pr_err("Unable to locate text_in buffer for sendtargets"
2241                    " discovery\n");
2242             goto reject;
2243         }
2244         goto empty_sendtargets;
2245     }
2246     if (strncmp("SendTargets=", text_in, 12) != 0) {
2247         pr_err("Received Text Data that is not"
2248             " SendTargets, cannot continue.\n");
2249         goto reject;
2250     }
2251     /* '=' confirmed in strncmp */
2252     text_ptr = strchr(text_in, '=');
2253     BUG_ON(!text_ptr);
2254     if (!strncmp("=All", text_ptr, 5)) {
2255         cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2256     } else if (!strncmp("=iqn.", text_ptr, 5) ||
2257            !strncmp("=eui.", text_ptr, 5)) {
2258         cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2259     } else {
2260         pr_err("Unable to locate valid SendTargets%s value\n",
2261                text_ptr);
2262         goto reject;
2263     }
2264
2265     spin_lock_bh(&conn->cmd_lock);
2266     list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2267     spin_unlock_bh(&conn->cmd_lock);
2268
2269 empty_sendtargets:
2270     iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2271
2272     if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2273         cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2274                 (unsigned char *)hdr, hdr->cmdsn);
2275         if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2276             return -1;
2277
2278         return 0;
2279     }
2280
2281     return iscsit_execute_cmd(cmd, 0);
2282
2283 reject:
2284     return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2285                  (unsigned char *)hdr);
2286 }
2287 EXPORT_SYMBOL(iscsit_process_text_cmd);
2288
2289 static int
2290 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2291                unsigned char *buf)
2292 {
2293     struct iscsi_text *hdr = (struct iscsi_text *)buf;
2294     char *text_in = NULL;
2295     u32 payload_length = ntoh24(hdr->dlength);
2296     int rx_size, rc;
2297
2298     rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2299     if (rc < 0)
2300         return 0;
2301
2302     rx_size = payload_length;
2303     if (payload_length) {
2304         u32 checksum = 0, data_crc = 0;
2305         u32 padding = 0;
2306         int niov = 0, rx_got;
2307         struct kvec iov[2];
2308
2309         rx_size = ALIGN(payload_length, 4);
2310         text_in = kzalloc(rx_size, GFP_KERNEL);
2311         if (!text_in)
2312             goto reject;
2313
2314         cmd->text_in_ptr = text_in;
2315
2316         memset(iov, 0, sizeof(iov));
2317         iov[niov].iov_base  = text_in;
2318         iov[niov++].iov_len = rx_size;
2319
2320         padding = rx_size - payload_length;
2321         if (padding)
2322             pr_debug("Receiving %u additional bytes"
2323                     " for padding.\n", padding);
2324         if (conn->conn_ops->DataDigest) {
2325             iov[niov].iov_base  = &checksum;
2326             iov[niov++].iov_len = ISCSI_CRC_LEN;
2327             rx_size += ISCSI_CRC_LEN;
2328         }
2329
2330         WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2331         rx_got = rx_data(conn, &iov[0], niov, rx_size);
2332         if (rx_got != rx_size)
2333             goto reject;
2334
2335         if (conn->conn_ops->DataDigest) {
2336             iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2337                           text_in, rx_size, 0, NULL,
2338                           &data_crc);
2339
2340             if (checksum != data_crc) {
2341                 pr_err("Text data CRC32C DataDigest"
2342                     " 0x%08x does not match computed"
2343                     " 0x%08x\n", checksum, data_crc);
2344                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2345                     pr_err("Unable to recover from"
2346                     " Text Data digest failure while in"
2347                         " ERL=0.\n");
2348                     goto reject;
2349                 } else {
2350                     /*
2351                      * Silently drop this PDU and let the
2352                      * initiator plug the CmdSN gap.
2353                      */
2354                     pr_debug("Dropping Text"
2355                     " Command CmdSN: 0x%08x due to"
2356                     " DataCRC error.\n", hdr->cmdsn);
2357                     kfree(text_in);
2358                     return 0;
2359                 }
2360             } else {
2361                 pr_debug("Got CRC32C DataDigest"
2362                     " 0x%08x for %u bytes of text data.\n",
2363                         checksum, payload_length);
2364             }
2365         }
2366         text_in[payload_length - 1] = '\0';
2367         pr_debug("Successfully read %d bytes of text"
2368                 " data.\n", payload_length);
2369     }
2370
2371     return iscsit_process_text_cmd(conn, cmd, hdr);
2372
2373 reject:
2374     kfree(cmd->text_in_ptr);
2375     cmd->text_in_ptr = NULL;
2376     return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2377 }
2378
2379 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2380 {
2381     struct iscsit_conn *conn_p;
2382     struct iscsit_session *sess = conn->sess;
2383
2384     pr_debug("Received logout request CLOSESESSION on CID: %hu"
2385         " for SID: %u.\n", conn->cid, conn->sess->sid);
2386
2387     atomic_set(&sess->session_logout, 1);
2388     atomic_set(&conn->conn_logout_remove, 1);
2389     conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2390
2391     iscsit_inc_conn_usage_count(conn);
2392     iscsit_inc_session_usage_count(sess);
2393
2394     spin_lock_bh(&sess->conn_lock);
2395     list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2396         if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2397             continue;
2398
2399         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2400         conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2401     }
2402     spin_unlock_bh(&sess->conn_lock);
2403
2404     iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2405
2406     return 0;
2407 }
2408
2409 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2410 {
2411     struct iscsit_conn *l_conn;
2412     struct iscsit_session *sess = conn->sess;
2413
2414     pr_debug("Received logout request CLOSECONNECTION for CID:"
2415         " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2416
2417     /*
2418      * A Logout Request with a CLOSECONNECTION reason code for a CID
2419      * can arrive on a connection with a differing CID.
2420      */
2421     if (conn->cid == cmd->logout_cid) {
2422         spin_lock_bh(&conn->state_lock);
2423         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2424         conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2425
2426         atomic_set(&conn->conn_logout_remove, 1);
2427         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2428         iscsit_inc_conn_usage_count(conn);
2429
2430         spin_unlock_bh(&conn->state_lock);
2431     } else {
2432         /*
2433          * Handle all different cid CLOSECONNECTION requests in
2434          * iscsit_logout_post_handler_diffcid() as to give enough
2435          * time for any non immediate command's CmdSN to be
2436          * acknowledged on the connection in question.
2437          *
2438          * Here we simply make sure the CID is still around.
2439          */
2440         l_conn = iscsit_get_conn_from_cid(sess,
2441                 cmd->logout_cid);
2442         if (!l_conn) {
2443             cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2444             iscsit_add_cmd_to_response_queue(cmd, conn,
2445                     cmd->i_state);
2446             return 0;
2447         }
2448
2449         iscsit_dec_conn_usage_count(l_conn);
2450     }
2451
2452     iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2453
2454     return 0;
2455 }
2456
2457 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2458 {
2459     struct iscsit_session *sess = conn->sess;
2460
2461     pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2462         " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2463
2464     if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2465         pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2466             " while ERL!=2.\n");
2467         cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2468         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2469         return 0;
2470     }
2471
2472     if (conn->cid == cmd->logout_cid) {
2473         pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2474             " with CID: %hu on CID: %hu, implementation error.\n",
2475                 cmd->logout_cid, conn->cid);
2476         cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2477         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2478         return 0;
2479     }
2480
2481     iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2482
2483     return 0;
2484 }
2485
2486 int
2487 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2488             unsigned char *buf)
2489 {
2490     int cmdsn_ret, logout_remove = 0;
2491     u8 reason_code = 0;
2492     struct iscsi_logout *hdr;
2493     struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2494
2495     hdr         = (struct iscsi_logout *) buf;
2496     reason_code     = (hdr->flags & 0x7f);
2497
2498     if (tiqn) {
2499         spin_lock(&tiqn->logout_stats.lock);
2500         if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2501             tiqn->logout_stats.normal_logouts++;
2502         else
2503             tiqn->logout_stats.abnormal_logouts++;
2504         spin_unlock(&tiqn->logout_stats.lock);
2505     }
2506
2507     pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2508         " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2509         hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2510         hdr->cid, conn->cid);
2511
2512     if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2513         pr_err("Received logout request on connection that"
2514             " is not in logged in state, ignoring request.\n");
2515         iscsit_free_cmd(cmd, false);
2516         return 0;
2517     }
2518
2519     cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2520     cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2521     cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2522     conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2523     cmd->targ_xfer_tag      = 0xFFFFFFFF;
2524     cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2525     cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2526     cmd->logout_cid         = be16_to_cpu(hdr->cid);
2527     cmd->logout_reason      = reason_code;
2528     cmd->data_direction     = DMA_NONE;
2529
2530     /*
2531      * We need to sleep in these cases (by returning 1) until the Logout
2532      * Response gets sent in the tx thread.
2533      */
2534     if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2535        ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2536         be16_to_cpu(hdr->cid) == conn->cid))
2537         logout_remove = 1;
2538
2539     spin_lock_bh(&conn->cmd_lock);
2540     list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2541     spin_unlock_bh(&conn->cmd_lock);
2542
2543     if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2544         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2545
2546     /*
2547      * Immediate commands are executed, well, immediately.
2548      * Non-Immediate Logout Commands are executed in CmdSN order.
2549      */
2550     if (cmd->immediate_cmd) {
2551         int ret = iscsit_execute_cmd(cmd, 0);
2552
2553         if (ret < 0)
2554             return ret;
2555     } else {
2556         cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2557         if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2558             logout_remove = 0;
2559         else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2560             return -1;
2561     }
2562
2563     return logout_remove;
2564 }
2565 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2566
2567 int iscsit_handle_snack(
2568     struct iscsit_conn *conn,
2569     unsigned char *buf)
2570 {
2571     struct iscsi_snack *hdr;
2572
2573     hdr         = (struct iscsi_snack *) buf;
2574     hdr->flags      &= ~ISCSI_FLAG_CMD_FINAL;
2575
2576     pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2577         " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2578         " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2579             hdr->begrun, hdr->runlength, conn->cid);
2580
2581     if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2582         pr_err("Initiator sent SNACK request while in"
2583             " ErrorRecoveryLevel=0.\n");
2584         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2585                      buf);
2586     }
2587     /*
2588      * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2589      * call from inside iscsi_send_recovery_datain_or_r2t().
2590      */
2591     switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2592     case 0:
2593         return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2594             hdr->itt,
2595             be32_to_cpu(hdr->ttt),
2596             be32_to_cpu(hdr->begrun),
2597             be32_to_cpu(hdr->runlength));
2598     case ISCSI_FLAG_SNACK_TYPE_STATUS:
2599         return iscsit_handle_status_snack(conn, hdr->itt,
2600             be32_to_cpu(hdr->ttt),
2601             be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2602     case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2603         return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2604             be32_to_cpu(hdr->begrun),
2605             be32_to_cpu(hdr->runlength));
2606     case ISCSI_FLAG_SNACK_TYPE_RDATA:
2607         /* FIXME: Support R-Data SNACK */
2608         pr_err("R-Data SNACK Not Supported.\n");
2609         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2610                      buf);
2611     default:
2612         pr_err("Unknown SNACK type 0x%02x, protocol"
2613             " error.\n", hdr->flags & 0x0f);
2614         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2615                      buf);
2616     }
2617
2618     return 0;
2619 }
2620 EXPORT_SYMBOL(iscsit_handle_snack);
2621
2622 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2623 {
2624     if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2625         (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2626         wait_for_completion_interruptible_timeout(
2627                     &conn->rx_half_close_comp,
2628                     ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2629     }
2630 }
2631
2632 static int iscsit_handle_immediate_data(
2633     struct iscsit_cmd *cmd,
2634     struct iscsi_scsi_req *hdr,
2635     u32 length)
2636 {
2637     int iov_ret, rx_got = 0, rx_size = 0;
2638     u32 checksum, iov_count = 0, padding = 0;
2639     struct iscsit_conn *conn = cmd->conn;
2640     struct kvec *iov;
2641     void *overflow_buf = NULL;
2642
2643     BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2644     rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2645     iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2646                    cmd->orig_iov_data_count - 2,
2647                    cmd->write_data_done, rx_size);
2648     if (iov_ret < 0)
2649         return IMMEDIATE_DATA_CANNOT_RECOVER;
2650
2651     iov_count = iov_ret;
2652     iov = &cmd->iov_data[0];
2653     if (rx_size < length) {
2654         /*
2655          * Special case: length of immediate data exceeds the data
2656          * buffer size derived from the CDB.
2657          */
2658         overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2659         if (!overflow_buf) {
2660             iscsit_unmap_iovec(cmd);
2661             return IMMEDIATE_DATA_CANNOT_RECOVER;
2662         }
2663         cmd->overflow_buf = overflow_buf;
2664         iov[iov_count].iov_base = overflow_buf;
2665         iov[iov_count].iov_len = length - rx_size;
2666         iov_count++;
2667         rx_size = length;
2668     }
2669
2670     padding = ((-length) & 3);
2671     if (padding != 0) {
2672         iov[iov_count].iov_base = cmd->pad_bytes;
2673         iov[iov_count++].iov_len = padding;
2674         rx_size += padding;
2675     }
2676
2677     if (conn->conn_ops->DataDigest) {
2678         iov[iov_count].iov_base     = &checksum;
2679         iov[iov_count++].iov_len    = ISCSI_CRC_LEN;
2680         rx_size += ISCSI_CRC_LEN;
2681     }
2682
2683     WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2684     rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2685
2686     iscsit_unmap_iovec(cmd);
2687
2688     if (rx_got != rx_size) {
2689         iscsit_rx_thread_wait_for_tcp(conn);
2690         return IMMEDIATE_DATA_CANNOT_RECOVER;
2691     }
2692
2693     if (conn->conn_ops->DataDigest) {
2694         u32 data_crc;
2695
2696         data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2697                             cmd->write_data_done, length, padding,
2698                             cmd->pad_bytes);
2699
2700         if (checksum != data_crc) {
2701             pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2702                 " does not match computed 0x%08x\n", checksum,
2703                 data_crc);
2704
2705             if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2706                 pr_err("Unable to recover from"
2707                     " Immediate Data digest failure while"
2708                     " in ERL=0.\n");
2709                 iscsit_reject_cmd(cmd,
2710                         ISCSI_REASON_DATA_DIGEST_ERROR,
2711                         (unsigned char *)hdr);
2712                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2713             } else {
2714                 iscsit_reject_cmd(cmd,
2715                         ISCSI_REASON_DATA_DIGEST_ERROR,
2716                         (unsigned char *)hdr);
2717                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2718             }
2719         } else {
2720             pr_debug("Got CRC32C DataDigest 0x%08x for"
2721                 " %u bytes of Immediate Data\n", checksum,
2722                 length);
2723         }
2724     }
2725
2726     cmd->write_data_done += length;
2727
2728     if (cmd->write_data_done == cmd->se_cmd.data_length) {
2729         spin_lock_bh(&cmd->istate_lock);
2730         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2731         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2732         spin_unlock_bh(&cmd->istate_lock);
2733     }
2734
2735     return IMMEDIATE_DATA_NORMAL_OPERATION;
2736 }
2737
2738 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2739     with active network interface */
2740 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2741 {
2742     struct iscsit_cmd *cmd;
2743     struct iscsit_conn *conn_p;
2744     bool found = false;
2745
2746     lockdep_assert_held(&conn->sess->conn_lock);
2747
2748     /*
2749      * Only send a Asynchronous Message on connections whos network
2750      * interface is still functional.
2751      */
2752     list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2753         if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2754             iscsit_inc_conn_usage_count(conn_p);
2755             found = true;
2756             break;
2757         }
2758     }
2759
2760     if (!found)
2761         return;
2762
2763     cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2764     if (!cmd) {
2765         iscsit_dec_conn_usage_count(conn_p);
2766         return;
2767     }
2768
2769     cmd->logout_cid = conn->cid;
2770     cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2771     cmd->i_state = ISTATE_SEND_ASYNCMSG;
2772
2773     spin_lock_bh(&conn_p->cmd_lock);
2774     list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2775     spin_unlock_bh(&conn_p->cmd_lock);
2776
2777     iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2778     iscsit_dec_conn_usage_count(conn_p);
2779 }
2780
2781 static int iscsit_send_conn_drop_async_message(
2782     struct iscsit_cmd *cmd,
2783     struct iscsit_conn *conn)
2784 {
2785     struct iscsi_async *hdr;
2786
2787     cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2788
2789     hdr         = (struct iscsi_async *) cmd->pdu;
2790     hdr->opcode     = ISCSI_OP_ASYNC_EVENT;
2791     hdr->flags      = ISCSI_FLAG_CMD_FINAL;
2792     cmd->init_task_tag  = RESERVED_ITT;
2793     cmd->targ_xfer_tag  = 0xFFFFFFFF;
2794     put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2795     cmd->stat_sn        = conn->stat_sn++;
2796     hdr->statsn     = cpu_to_be32(cmd->stat_sn);
2797     hdr->exp_cmdsn      = cpu_to_be32(conn->sess->exp_cmd_sn);
2798     hdr->max_cmdsn      = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2799     hdr->async_event    = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2800     hdr->param1     = cpu_to_be16(cmd->logout_cid);
2801     hdr->param2     = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2802     hdr->param3     = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2803
2804     pr_debug("Sending Connection Dropped Async Message StatSN:"
2805         " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2806             cmd->logout_cid, conn->cid);
2807
2808     return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2809 }
2810
2811 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2812 {
2813     if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2814         (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2815         wait_for_completion_interruptible_timeout(
2816                     &conn->tx_half_close_comp,
2817                     ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2818     }
2819 }
2820
2821 void
2822 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2823             struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2824             bool set_statsn)
2825 {
2826     hdr->opcode     = ISCSI_OP_SCSI_DATA_IN;
2827     hdr->flags      = datain->flags;
2828     if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2829         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2830             hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2831             hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2832         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2833             hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2834             hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2835         }
2836     }
2837     hton24(hdr->dlength, datain->length);
2838     if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2839         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2840                 (struct scsi_lun *)&hdr->lun);
2841     else
2842         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2843
2844     hdr->itt        = cmd->init_task_tag;
2845
2846     if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2847         hdr->ttt        = cpu_to_be32(cmd->targ_xfer_tag);
2848     else
2849         hdr->ttt        = cpu_to_be32(0xFFFFFFFF);
2850     if (set_statsn)
2851         hdr->statsn     = cpu_to_be32(cmd->stat_sn);
2852     else
2853         hdr->statsn     = cpu_to_be32(0xFFFFFFFF);
2854
2855     hdr->exp_cmdsn      = cpu_to_be32(conn->sess->exp_cmd_sn);
2856     hdr->max_cmdsn      = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2857     hdr->datasn     = cpu_to_be32(datain->data_sn);
2858     hdr->offset     = cpu_to_be32(datain->offset);
2859
2860     pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2861         " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2862         cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2863         ntohl(hdr->offset), datain->length, conn->cid);
2864 }
2865 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2866
2867 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2868 {
2869     struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2870     struct iscsi_datain datain;
2871     struct iscsi_datain_req *dr;
2872     int eodr = 0, ret;
2873     bool set_statsn = false;
2874
2875     memset(&datain, 0, sizeof(struct iscsi_datain));
2876     dr = iscsit_get_datain_values(cmd, &datain);
2877     if (!dr) {
2878         pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2879                 cmd->init_task_tag);
2880         return -1;
2881     }
2882     /*
2883      * Be paranoid and double check the logic for now.
2884      */
2885     if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2886         pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2887             " datain.length: %u exceeds cmd->data_length: %u\n",
2888             cmd->init_task_tag, datain.offset, datain.length,
2889             cmd->se_cmd.data_length);
2890         return -1;
2891     }
2892
2893     atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2894     /*
2895      * Special case for successfully execution w/ both DATAIN
2896      * and Sense Data.
2897      */
2898     if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2899         (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2900         datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2901     else {
2902         if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2903             (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2904             iscsit_increment_maxcmdsn(cmd, conn->sess);
2905             cmd->stat_sn = conn->stat_sn++;
2906             set_statsn = true;
2907         } else if (dr->dr_complete ==
2908                DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2909             set_statsn = true;
2910     }
2911
2912     iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2913
2914     ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2915     if (ret < 0)
2916         return ret;
2917
2918     if (dr->dr_complete) {
2919         eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2920                 2 : 1;
2921         iscsit_free_datain_req(cmd, dr);
2922     }
2923
2924     return eodr;
2925 }
2926
2927 int
2928 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2929             struct iscsi_logout_rsp *hdr)
2930 {
2931     struct iscsit_conn *logout_conn = NULL;
2932     struct iscsi_conn_recovery *cr = NULL;
2933     struct iscsit_session *sess = conn->sess;
2934     /*
2935      * The actual shutting down of Sessions and/or Connections
2936      * for CLOSESESSION and CLOSECONNECTION Logout Requests
2937      * is done in scsi_logout_post_handler().
2938      */
2939     switch (cmd->logout_reason) {
2940     case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2941         pr_debug("iSCSI session logout successful, setting"
2942             " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2943         cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2944         break;
2945     case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2946         if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2947             break;
2948         /*
2949          * For CLOSECONNECTION logout requests carrying
2950          * a matching logout CID -> local CID, the reference
2951          * for the local CID will have been incremented in
2952          * iscsi_logout_closeconnection().
2953          *
2954          * For CLOSECONNECTION logout requests carrying
2955          * a different CID than the connection it arrived
2956          * on, the connection responding to cmd->logout_cid
2957          * is stopped in iscsit_logout_post_handler_diffcid().
2958          */
2959
2960         pr_debug("iSCSI CID: %hu logout on CID: %hu"
2961             " successful.\n", cmd->logout_cid, conn->cid);
2962         cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2963         break;
2964     case ISCSI_LOGOUT_REASON_RECOVERY:
2965         if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2966             (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2967             break;
2968         /*
2969          * If the connection is still active from our point of view
2970          * force connection recovery to occur.
2971          */
2972         logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2973                 cmd->logout_cid);
2974         if (logout_conn) {
2975             iscsit_connection_reinstatement_rcfr(logout_conn);
2976             iscsit_dec_conn_usage_count(logout_conn);
2977         }
2978
2979         cr = iscsit_get_inactive_connection_recovery_entry(
2980                 conn->sess, cmd->logout_cid);
2981         if (!cr) {
2982             pr_err("Unable to locate CID: %hu for"
2983             " REMOVECONNFORRECOVERY Logout Request.\n",
2984                 cmd->logout_cid);
2985             cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2986             break;
2987         }
2988
2989         iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2990
2991         pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2992             " for recovery for CID: %hu on CID: %hu successful.\n",
2993                 cmd->logout_cid, conn->cid);
2994         cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2995         break;
2996     default:
2997         pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2998                 cmd->logout_reason);
2999         return -1;
3000     }
3001
3002     hdr->opcode     = ISCSI_OP_LOGOUT_RSP;
3003     hdr->flags      |= ISCSI_FLAG_CMD_FINAL;
3004     hdr->response       = cmd->logout_response;
3005     hdr->itt        = cmd->init_task_tag;
3006     cmd->stat_sn        = conn->stat_sn++;
3007     hdr->statsn     = cpu_to_be32(cmd->stat_sn);
3008
3009     iscsit_increment_maxcmdsn(cmd, conn->sess);
3010     hdr->exp_cmdsn      = cpu_to_be32(conn->sess->exp_cmd_sn);
3011     hdr->max_cmdsn      = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3012
3013     pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
3014         " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
3015         cmd->init_task_tag, cmd->stat_sn, hdr->response,
3016         cmd->logout_cid, conn->cid);
3017
3018     return 0;
3019 }
3020 EXPORT_SYMBOL(iscsit_build_logout_rsp);
3021
3022 static int
3023 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3024 {
3025     int rc;
3026
3027     rc = iscsit_build_logout_rsp(cmd, conn,
3028             (struct iscsi_logout_rsp *)&cmd->pdu[0]);
3029     if (rc < 0)
3030         return rc;
3031
3032     return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3033 }
3034
3035 void
3036 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3037                struct iscsi_nopin *hdr, bool nopout_response)
3038 {
3039     hdr->opcode     = ISCSI_OP_NOOP_IN;
3040     hdr->flags      |= ISCSI_FLAG_CMD_FINAL;
3041         hton24(hdr->dlength, cmd->buf_ptr_size);
3042     if (nopout_response)
3043         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3044     hdr->itt        = cmd->init_task_tag;
3045     hdr->ttt        = cpu_to_be32(cmd->targ_xfer_tag);
3046     cmd->stat_sn        = (nopout_response) ? conn->stat_sn++ :
3047                   conn->stat_sn;
3048     hdr->statsn     = cpu_to_be32(cmd->stat_sn);
3049
3050     if (nopout_response)
3051         iscsit_increment_maxcmdsn(cmd, conn->sess);
3052
3053     hdr->exp_cmdsn      = cpu_to_be32(conn->sess->exp_cmd_sn);
3054     hdr->max_cmdsn      = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3055
3056     pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3057         " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3058         "Solicited" : "Unsolicited", cmd->init_task_tag,
3059         cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3060 }
3061 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3062
3063 /*
3064  *  Unsolicited NOPIN, either requesting a response or not.
3065  */
3066 static int iscsit_send_unsolicited_nopin(
3067     struct iscsit_cmd *cmd,
3068     struct iscsit_conn *conn,
3069     int want_response)
3070 {
3071     struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3072     int ret;
3073
3074     iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3075
3076     pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3077         " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3078
3079     ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3080     if (ret < 0)
3081         return ret;
3082
3083     spin_lock_bh(&cmd->istate_lock);
3084     cmd->i_state = want_response ?
3085         ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3086     spin_unlock_bh(&cmd->istate_lock);
3087
3088     return 0;
3089 }
3090
3091 static int
3092 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3093 {
3094     struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3095
3096     iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3097
3098     /*
3099      * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3100      * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3101      */
3102     pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3103
3104     return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3105                              cmd->buf_ptr,
3106                              cmd->buf_ptr_size);
3107 }
3108
3109 static int iscsit_send_r2t(
3110     struct iscsit_cmd *cmd,
3111     struct iscsit_conn *conn)
3112 {
3113     struct iscsi_r2t *r2t;
3114     struct iscsi_r2t_rsp *hdr;
3115     int ret;
3116
3117     r2t = iscsit_get_r2t_from_list(cmd);
3118     if (!r2t)
3119         return -1;
3120
3121     hdr         = (struct iscsi_r2t_rsp *) cmd->pdu;
3122     memset(hdr, 0, ISCSI_HDR_LEN);
3123     hdr->opcode     = ISCSI_OP_R2T;
3124     hdr->flags      |= ISCSI_FLAG_CMD_FINAL;
3125     int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3126             (struct scsi_lun *)&hdr->lun);
3127     hdr->itt        = cmd->init_task_tag;
3128     if (conn->conn_transport->iscsit_get_r2t_ttt)
3129         conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3130     else
3131         r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3132     hdr->ttt        = cpu_to_be32(r2t->targ_xfer_tag);
3133     hdr->statsn     = cpu_to_be32(conn->stat_sn);
3134     hdr->exp_cmdsn      = cpu_to_be32(conn->sess->exp_cmd_sn);
3135     hdr->max_cmdsn      = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3136     hdr->r2tsn      = cpu_to_be32(r2t->r2t_sn);
3137     hdr->data_offset    = cpu_to_be32(r2t->offset);
3138     hdr->data_length    = cpu_to_be32(r2t->xfer_len);
3139
3140     pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3141         " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3142         (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3143         r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3144             r2t->offset, r2t->xfer_len, conn->cid);
3145
3146     spin_lock_bh(&cmd->r2t_lock);
3147     r2t->sent_r2t = 1;
3148     spin_unlock_bh(&cmd->r2t_lock);
3149
3150     ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3151     if (ret < 0) {
3152         return ret;
3153     }
3154
3155     spin_lock_bh(&cmd->dataout_timeout_lock);
3156     iscsit_start_dataout_timer(cmd, conn);
3157     spin_unlock_bh(&cmd->dataout_timeout_lock);
3158
3159     return 0;
3160 }
3161
3162 /*
3163  *  @recovery: If called from iscsi_task_reassign_complete_write() for
3164  *      connection recovery.
3165  */
3166 int iscsit_build_r2ts_for_cmd(
3167     struct iscsit_conn *conn,
3168     struct iscsit_cmd *cmd,
3169     bool recovery)
3170 {
3171     int first_r2t = 1;
3172     u32 offset = 0, xfer_len = 0;
3173
3174     spin_lock_bh(&cmd->r2t_lock);
3175     if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3176         spin_unlock_bh(&cmd->r2t_lock);
3177         return 0;
3178     }
3179
3180     if (conn->sess->sess_ops->DataSequenceInOrder &&
3181         !recovery)
3182         cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3183
3184     while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3185         if (conn->sess->sess_ops->DataSequenceInOrder) {
3186             offset = cmd->r2t_offset;
3187
3188             if (first_r2t && recovery) {
3189                 int new_data_end = offset +
3190                     conn->sess->sess_ops->MaxBurstLength -
3191                     cmd->next_burst_len;
3192
3193                 if (new_data_end > cmd->se_cmd.data_length)
3194                     xfer_len = cmd->se_cmd.data_length - offset;
3195                 else
3196                     xfer_len =
3197                         conn->sess->sess_ops->MaxBurstLength -
3198                         cmd->next_burst_len;
3199             } else {
3200                 int new_data_end = offset +
3201                     conn->sess->sess_ops->MaxBurstLength;
3202
3203                 if (new_data_end > cmd->se_cmd.data_length)
3204                     xfer_len = cmd->se_cmd.data_length - offset;
3205                 else
3206                     xfer_len = conn->sess->sess_ops->MaxBurstLength;
3207             }
3208
3209             if ((s32)xfer_len < 0) {
3210                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3211                 break;
3212             }
3213
3214             cmd->r2t_offset += xfer_len;
3215
3216             if (cmd->r2t_offset == cmd->se_cmd.data_length)
3217                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3218         } else {
3219             struct iscsi_seq *seq;
3220
3221             seq = iscsit_get_seq_holder_for_r2t(cmd);
3222             if (!seq) {
3223                 spin_unlock_bh(&cmd->r2t_lock);
3224                 return -1;
3225             }
3226
3227             offset = seq->offset;
3228             xfer_len = seq->xfer_len;
3229
3230             if (cmd->seq_send_order == cmd->seq_count)
3231                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3232         }
3233         cmd->outstanding_r2ts++;
3234         first_r2t = 0;
3235
3236         if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3237             spin_unlock_bh(&cmd->r2t_lock);
3238             return -1;
3239         }
3240
3241         if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3242             break;
3243     }
3244     spin_unlock_bh(&cmd->r2t_lock);
3245
3246     return 0;
3247 }
3248 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3249
3250 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3251             bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3252 {
3253     if (inc_stat_sn)
3254         cmd->stat_sn = conn->stat_sn++;
3255
3256     atomic_long_inc(&conn->sess->rsp_pdus);
3257
3258     memset(hdr, 0, ISCSI_HDR_LEN);
3259     hdr->opcode     = ISCSI_OP_SCSI_CMD_RSP;
3260     hdr->flags      |= ISCSI_FLAG_CMD_FINAL;
3261     if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3262         hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3263         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3264     } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3265         hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3266         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3267     }
3268     hdr->response       = cmd->iscsi_response;
3269     hdr->cmd_status     = cmd->se_cmd.scsi_status;
3270     hdr->itt        = cmd->init_task_tag;
3271     hdr->statsn     = cpu_to_be32(cmd->stat_sn);
3272
3273     iscsit_increment_maxcmdsn(cmd, conn->sess);
3274     hdr->exp_cmdsn      = cpu_to_be32(conn->sess->exp_cmd_sn);
3275     hdr->max_cmdsn      = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3276
3277     pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3278         " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3279         cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3280         cmd->se_cmd.scsi_status, conn->cid);
3281 }
3282 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3283
3284 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3285 {
3286     struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3287     bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3288     void *data_buf = NULL;
3289     u32 padding = 0, data_buf_len = 0;
3290
3291     iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3292
3293     /*
3294      * Attach SENSE DATA payload to iSCSI Response PDU
3295      */
3296     if (cmd->se_cmd.sense_buffer &&
3297        ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3298         (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3299         put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3300         cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3301
3302         padding     = -(cmd->se_cmd.scsi_sense_length) & 3;
3303         hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3304         data_buf = cmd->sense_buffer;
3305         data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3306
3307         if (padding) {
3308             memset(cmd->sense_buffer +
3309                 cmd->se_cmd.scsi_sense_length, 0, padding);
3310             pr_debug("Adding %u bytes of padding to"
3311                 " SENSE.\n", padding);
3312         }
3313
3314         pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3315                 " Response PDU\n",
3316                 cmd->se_cmd.scsi_sense_length);
3317     }
3318
3319     return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3320                              data_buf_len);
3321 }
3322
3323 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3324 {
3325     switch (se_tmr->response) {
3326     case TMR_FUNCTION_COMPLETE:
3327         return ISCSI_TMF_RSP_COMPLETE;
3328     case TMR_TASK_DOES_NOT_EXIST:
3329         return ISCSI_TMF_RSP_NO_TASK;
3330     case TMR_LUN_DOES_NOT_EXIST:
3331         return ISCSI_TMF_RSP_NO_LUN;
3332     case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3333         return ISCSI_TMF_RSP_NOT_SUPPORTED;
3334     case TMR_FUNCTION_REJECTED:
3335     default:
3336         return ISCSI_TMF_RSP_REJECTED;
3337     }
3338 }
3339
3340 void
3341 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3342               struct iscsi_tm_rsp *hdr)
3343 {
3344     struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3345
3346     hdr->opcode     = ISCSI_OP_SCSI_TMFUNC_RSP;
3347     hdr->flags      = ISCSI_FLAG_CMD_FINAL;
3348     hdr->response       = iscsit_convert_tcm_tmr_rsp(se_tmr);
3349     hdr->itt        = cmd->init_task_tag;
3350     cmd->stat_sn        = conn->stat_sn++;
3351     hdr->statsn     = cpu_to_be32(cmd->stat_sn);
3352
3353     iscsit_increment_maxcmdsn(cmd, conn->sess);
3354     hdr->exp_cmdsn      = cpu_to_be32(conn->sess->exp_cmd_sn);
3355     hdr->max_cmdsn      = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3356
3357     pr_debug("Built Task Management Response ITT: 0x%08x,"
3358         " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3359         cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3360 }
3361 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3362
3363 static int
3364 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3365 {
3366     struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3367
3368     iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3369
3370     return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3371 }
3372
3373 #define SENDTARGETS_BUF_LIMIT 32768U
3374
3375 static int
3376 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3377                   enum iscsit_transport_type network_transport,
3378                   int skip_bytes, bool *completed)
3379 {
3380     char *payload = NULL;
3381     struct iscsit_conn *conn = cmd->conn;
3382     struct iscsi_portal_group *tpg;
3383     struct iscsi_tiqn *tiqn;
3384     struct iscsi_tpg_np *tpg_np;
3385     int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3386     int target_name_printed;
3387     unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3388     unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3389     bool active;
3390
3391     buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3392              SENDTARGETS_BUF_LIMIT);
3393
3394     payload = kzalloc(buffer_len, GFP_KERNEL);
3395     if (!payload)
3396         return -ENOMEM;
3397
3398     /*
3399      * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3400      * explicit case..
3401      */
3402     if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3403         text_ptr = strchr(text_in, '=');
3404         if (!text_ptr) {
3405             pr_err("Unable to locate '=' string in text_in:"
3406                    " %s\n", text_in);
3407             kfree(payload);
3408             return -EINVAL;
3409         }
3410         /*
3411          * Skip over '=' character..
3412          */
3413         text_ptr += 1;
3414     }
3415
3416     spin_lock(&tiqn_lock);
3417     list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3418         if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3419              strcmp(tiqn->tiqn, text_ptr)) {
3420             continue;
3421         }
3422
3423         target_name_printed = 0;
3424
3425         spin_lock(&tiqn->tiqn_tpg_lock);
3426         list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3427
3428             /* If demo_mode_discovery=0 and generate_node_acls=0
3429              * (demo mode dislabed) do not return
3430              * TargetName+TargetAddress unless a NodeACL exists.
3431              */
3432
3433             if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3434                 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3435                 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3436                 cmd->conn->sess->sess_ops->InitiatorName))) {
3437                 continue;
3438             }
3439
3440             spin_lock(&tpg->tpg_state_lock);
3441             active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3442             spin_unlock(&tpg->tpg_state_lock);
3443
3444             if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3445                 continue;
3446
3447             spin_lock(&tpg->tpg_np_lock);
3448             list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3449                         tpg_np_list) {
3450                 struct iscsi_np *np = tpg_np->tpg_np;
3451                 struct sockaddr_storage *sockaddr;
3452
3453                 if (np->np_network_transport != network_transport)
3454                     continue;
3455
3456                 if (!target_name_printed) {
3457                     len = sprintf(buf, "TargetName=%s",
3458                               tiqn->tiqn);
3459                     len += 1;
3460
3461                     if ((len + payload_len) > buffer_len) {
3462                         spin_unlock(&tpg->tpg_np_lock);
3463                         spin_unlock(&tiqn->tiqn_tpg_lock);
3464                         end_of_buf = 1;
3465                         goto eob;
3466                     }
3467
3468                     if (skip_bytes && len <= skip_bytes) {
3469                         skip_bytes -= len;
3470                     } else {
3471                         memcpy(payload + payload_len, buf, len);
3472                         payload_len += len;
3473                         target_name_printed = 1;
3474                         if (len > skip_bytes)
3475                             skip_bytes = 0;
3476                     }
3477                 }
3478
3479                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3480                     sockaddr = &conn->local_sockaddr;
3481                 else
3482                     sockaddr = &np->np_sockaddr;
3483
3484                 len = sprintf(buf, "TargetAddress="
3485                           "%pISpc,%hu",
3486                           sockaddr,
3487                           tpg->tpgt);
3488                 len += 1;
3489
3490                 if ((len + payload_len) > buffer_len) {
3491                     spin_unlock(&tpg->tpg_np_lock);
3492                     spin_unlock(&tiqn->tiqn_tpg_lock);
3493                     end_of_buf = 1;
3494                     goto eob;
3495                 }
3496
3497                 if (skip_bytes && len <= skip_bytes) {
3498                     skip_bytes -= len;
3499                 } else {
3500                     memcpy(payload + payload_len, buf, len);
3501                     payload_len += len;
3502                     if (len > skip_bytes)
3503                         skip_bytes = 0;
3504                 }
3505             }
3506             spin_unlock(&tpg->tpg_np_lock);
3507         }
3508         spin_unlock(&tiqn->tiqn_tpg_lock);
3509 eob:
3510         if (end_of_buf) {
3511             *completed = false;
3512             break;
3513         }
3514
3515         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3516             break;
3517     }
3518     spin_unlock(&tiqn_lock);
3519
3520     cmd->buf_ptr = payload;
3521
3522     return payload_len;
3523 }
3524
3525 int
3526 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3527               struct iscsi_text_rsp *hdr,
3528               enum iscsit_transport_type network_transport)
3529 {
3530     int text_length, padding;
3531     bool completed = true;
3532
3533     text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3534                             cmd->read_data_done,
3535                             &completed);
3536     if (text_length < 0)
3537         return text_length;
3538
3539     if (completed) {
3540         hdr->flags = ISCSI_FLAG_CMD_FINAL;
3541     } else {
3542         hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3543         cmd->read_data_done += text_length;
3544         if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3545             cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3546     }
3547     hdr->opcode = ISCSI_OP_TEXT_RSP;
3548     padding = ((-text_length) & 3);
3549     hton24(hdr->dlength, text_length);
3550     hdr->itt = cmd->init_task_tag;
3551     hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3552     cmd->stat_sn = conn->stat_sn++;
3553     hdr->statsn = cpu_to_be32(cmd->stat_sn);
3554
3555     iscsit_increment_maxcmdsn(cmd, conn->sess);
3556     /*
3557      * Reset maxcmdsn_inc in multi-part text payload exchanges to
3558      * correctly increment MaxCmdSN for each response answering a
3559      * non immediate text request with a valid CmdSN.
3560      */
3561     cmd->maxcmdsn_inc = 0;
3562     hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3563     hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3564
3565     pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3566         " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3567         cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3568         !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3569         !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3570
3571     return text_length + padding;
3572 }
3573 EXPORT_SYMBOL(iscsit_build_text_rsp);
3574
3575 static int iscsit_send_text_rsp(
3576     struct iscsit_cmd *cmd,
3577     struct iscsit_conn *conn)
3578 {
3579     struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3580     int text_length;
3581
3582     text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3583                 conn->conn_transport->transport_type);
3584     if (text_length < 0)
3585         return text_length;
3586
3587     return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3588                              cmd->buf_ptr,
3589                              text_length);
3590 }
3591
3592 void
3593 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3594             struct iscsi_reject *hdr)
3595 {
3596     hdr->opcode     = ISCSI_OP_REJECT;
3597     hdr->reason     = cmd->reject_reason;
3598     hdr->flags      |= ISCSI_FLAG_CMD_FINAL;
3599     hton24(hdr->dlength, ISCSI_HDR_LEN);
3600     hdr->ffffffff       = cpu_to_be32(0xffffffff);
3601     cmd->stat_sn        = conn->stat_sn++;
3602     hdr->statsn     = cpu_to_be32(cmd->stat_sn);
3603     hdr->exp_cmdsn      = cpu_to_be32(conn->sess->exp_cmd_sn);
3604     hdr->max_cmdsn      = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3605
3606 }
3607 EXPORT_SYMBOL(iscsit_build_reject);
3608
3609 static int iscsit_send_reject(
3610     struct iscsit_cmd *cmd,
3611     struct iscsit_conn *conn)
3612 {
3613     struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3614
3615     iscsit_build_reject(cmd, conn, hdr);
3616
3617     pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3618         " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3619
3620     return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3621                              cmd->buf_ptr,
3622                              ISCSI_HDR_LEN);
3623 }
3624
3625 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3626 {
3627     int ord, cpu;
3628     cpumask_var_t conn_allowed_cpumask;
3629
3630     /*
3631      * bitmap_id is assigned from iscsit_global->ts_bitmap from
3632      * within iscsit_start_kthreads()
3633      *
3634      * Here we use bitmap_id to determine which CPU that this
3635      * iSCSI connection's RX/TX threads will be scheduled to
3636      * execute upon.
3637      */
3638     if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3639         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3640         for_each_online_cpu(cpu) {
3641             if (ord-- == 0) {
3642                 cpumask_set_cpu(cpu, conn->conn_cpumask);
3643                 return;
3644             }
3645         }
3646     } else {
3647         cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3648             cpu_online_mask);
3649
3650         cpumask_clear(conn->conn_cpumask);
3651         ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3652         for_each_cpu(cpu, conn_allowed_cpumask) {
3653             if (ord-- == 0) {
3654                 cpumask_set_cpu(cpu, conn->conn_cpumask);
3655                 free_cpumask_var(conn_allowed_cpumask);
3656                 return;
3657             }
3658         }
3659         free_cpumask_var(conn_allowed_cpumask);
3660     }
3661     /*
3662      * This should never be reached..
3663      */
3664     dump_stack();
3665     cpumask_setall(conn->conn_cpumask);
3666 }
3667
3668 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3669 {
3670     /*
3671      * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3672      * connection's RX/TX threads update conn->allowed_cpumask.
3673      */
3674     if (!cpumask_equal(iscsit_global->allowed_cpumask,
3675                conn->allowed_cpumask)) {
3676         iscsit_thread_get_cpumask(conn);
3677         conn->conn_tx_reset_cpumask = 1;
3678         conn->conn_rx_reset_cpumask = 1;
3679         cpumask_copy(conn->allowed_cpumask,
3680                  iscsit_global->allowed_cpumask);
3681     }
3682 }
3683
3684 void iscsit_thread_check_cpumask(
3685     struct iscsit_conn *conn,
3686     struct task_struct *p,
3687     int mode)
3688 {
3689     /*
3690      * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3691      * at the same time. The RX thread might be faster and return from
3692      * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3693      * Then the TX thread sets it back to 1.
3694      * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3695      * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3696      */
3697     iscsit_thread_reschedule(conn);
3698
3699     /*
3700      * mode == 1 signals iscsi_target_tx_thread() usage.
3701      * mode == 0 signals iscsi_target_rx_thread() usage.
3702      */
3703     if (mode == 1) {
3704         if (!conn->conn_tx_reset_cpumask)
3705             return;
3706     } else {
3707         if (!conn->conn_rx_reset_cpumask)
3708             return;
3709     }
3710
3711     /*
3712      * Update the CPU mask for this single kthread so that
3713      * both TX and RX kthreads are scheduled to run on the
3714      * same CPU.
3715      */
3716     set_cpus_allowed_ptr(p, conn->conn_cpumask);
3717     if (mode == 1)
3718         conn->conn_tx_reset_cpumask = 0;
3719     else
3720         conn->conn_rx_reset_cpumask = 0;
3721 }
3722 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3723
3724 int
3725 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3726 {
3727     int ret;
3728
3729     switch (state) {
3730     case ISTATE_SEND_R2T:
3731         ret = iscsit_send_r2t(cmd, conn);
3732         if (ret < 0)
3733             goto err;
3734         break;
3735     case ISTATE_REMOVE:
3736         spin_lock_bh(&conn->cmd_lock);
3737         list_del_init(&cmd->i_conn_node);
3738         spin_unlock_bh(&conn->cmd_lock);
3739
3740         iscsit_free_cmd(cmd, false);
3741         break;
3742     case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3743         iscsit_mod_nopin_response_timer(conn);
3744         ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3745         if (ret < 0)
3746             goto err;
3747         break;
3748     case ISTATE_SEND_NOPIN_NO_RESPONSE:
3749         ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3750         if (ret < 0)
3751             goto err;
3752         break;
3753     default:
3754         pr_err("Unknown Opcode: 0x%02x ITT:"
3755                " 0x%08x, i_state: %d on CID: %hu\n",
3756                cmd->iscsi_opcode, cmd->init_task_tag, state,
3757                conn->cid);
3758         goto err;
3759     }
3760
3761     return 0;
3762
3763 err:
3764     return -1;
3765 }
3766 EXPORT_SYMBOL(iscsit_immediate_queue);
3767
3768 static int
3769 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3770 {
3771     struct iscsit_transport *t = conn->conn_transport;
3772     struct iscsi_queue_req *qr;
3773     struct iscsit_cmd *cmd;
3774     u8 state;
3775     int ret;
3776
3777     while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3778         atomic_set(&conn->check_immediate_queue, 0);
3779         cmd = qr->cmd;
3780         state = qr->state;
3781         kmem_cache_free(lio_qr_cache, qr);
3782
3783         ret = t->iscsit_immediate_queue(conn, cmd, state);
3784         if (ret < 0)
3785             return ret;
3786     }
3787
3788     return 0;
3789 }
3790
3791 int
3792 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3793 {
3794     int ret;
3795
3796 check_rsp_state:
3797     switch (state) {
3798     case ISTATE_SEND_DATAIN:
3799         ret = iscsit_send_datain(cmd, conn);
3800         if (ret < 0)
3801             goto err;
3802         else if (!ret)
3803             /* more drs */
3804             goto check_rsp_state;
3805         else if (ret == 1) {
3806             /* all done */
3807             spin_lock_bh(&cmd->istate_lock);
3808             cmd->i_state = ISTATE_SENT_STATUS;
3809             spin_unlock_bh(&cmd->istate_lock);
3810
3811             if (atomic_read(&conn->check_immediate_queue))
3812                 return 1;
3813
3814             return 0;
3815         } else if (ret == 2) {
3816             /* Still must send status,
3817                SCF_TRANSPORT_TASK_SENSE was set */
3818             spin_lock_bh(&cmd->istate_lock);
3819             cmd->i_state = ISTATE_SEND_STATUS;
3820             spin_unlock_bh(&cmd->istate_lock);
3821             state = ISTATE_SEND_STATUS;
3822             goto check_rsp_state;
3823         }
3824
3825         break;
3826     case ISTATE_SEND_STATUS:
3827     case ISTATE_SEND_STATUS_RECOVERY:
3828         ret = iscsit_send_response(cmd, conn);
3829         break;
3830     case ISTATE_SEND_LOGOUTRSP:
3831         ret = iscsit_send_logout(cmd, conn);
3832         break;
3833     case ISTATE_SEND_ASYNCMSG:
3834         ret = iscsit_send_conn_drop_async_message(
3835             cmd, conn);
3836         break;
3837     case ISTATE_SEND_NOPIN:
3838         ret = iscsit_send_nopin(cmd, conn);
3839         break;
3840     case ISTATE_SEND_REJECT:
3841         ret = iscsit_send_reject(cmd, conn);
3842         break;
3843     case ISTATE_SEND_TASKMGTRSP:
3844         ret = iscsit_send_task_mgt_rsp(cmd, conn);
3845         if (ret != 0)
3846             break;
3847         ret = iscsit_tmr_post_handler(cmd, conn);
3848         if (ret != 0)
3849             iscsit_fall_back_to_erl0(conn->sess);
3850         break;
3851     case ISTATE_SEND_TEXTRSP:
3852         ret = iscsit_send_text_rsp(cmd, conn);
3853         break;
3854     default:
3855         pr_err("Unknown Opcode: 0x%02x ITT:"
3856                " 0x%08x, i_state: %d on CID: %hu\n",
3857                cmd->iscsi_opcode, cmd->init_task_tag,
3858                state, conn->cid);
3859         goto err;
3860     }
3861     if (ret < 0)
3862         goto err;
3863
3864     switch (state) {
3865     case ISTATE_SEND_LOGOUTRSP:
3866         if (!iscsit_logout_post_handler(cmd, conn))
3867             return -ECONNRESET;
3868         fallthrough;
3869     case ISTATE_SEND_STATUS:
3870     case ISTATE_SEND_ASYNCMSG:
3871     case ISTATE_SEND_NOPIN:
3872     case ISTATE_SEND_STATUS_RECOVERY:
3873     case ISTATE_SEND_TEXTRSP:
3874     case ISTATE_SEND_TASKMGTRSP:
3875     case ISTATE_SEND_REJECT:
3876         spin_lock_bh(&cmd->istate_lock);
3877         cmd->i_state = ISTATE_SENT_STATUS;
3878         spin_unlock_bh(&cmd->istate_lock);
3879         break;
3880     default:
3881         pr_err("Unknown Opcode: 0x%02x ITT:"
3882                " 0x%08x, i_state: %d on CID: %hu\n",
3883                cmd->iscsi_opcode, cmd->init_task_tag,
3884                cmd->i_state, conn->cid);
3885         goto err;
3886     }
3887
3888     if (atomic_read(&conn->check_immediate_queue))
3889         return 1;
3890
3891     return 0;
3892
3893 err:
3894     return -1;
3895 }
3896 EXPORT_SYMBOL(iscsit_response_queue);
3897
3898 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3899 {
3900     struct iscsit_transport *t = conn->conn_transport;
3901     struct iscsi_queue_req *qr;
3902     struct iscsit_cmd *cmd;
3903     u8 state;
3904     int ret;
3905
3906     while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3907         cmd = qr->cmd;
3908         state = qr->state;
3909         kmem_cache_free(lio_qr_cache, qr);
3910
3911         ret = t->iscsit_response_queue(conn, cmd, state);
3912         if (ret == 1 || ret < 0)
3913             return ret;
3914     }
3915
3916     return 0;
3917 }
3918
3919 int iscsi_target_tx_thread(void *arg)
3920 {
3921     int ret = 0;
3922     struct iscsit_conn *conn = arg;
3923     bool conn_freed = false;
3924
3925     /*
3926      * Allow ourselves to be interrupted by SIGINT so that a
3927      * connection recovery / failure event can be triggered externally.
3928      */
3929     allow_signal(SIGINT);
3930
3931     while (!kthread_should_stop()) {
3932         /*
3933          * Ensure that both TX and RX per connection kthreads
3934          * are scheduled to run on the same CPU.
3935          */
3936         iscsit_thread_check_cpumask(conn, current, 1);
3937
3938         wait_event_interruptible(conn->queues_wq,
3939                      !iscsit_conn_all_queues_empty(conn));
3940
3941         if (signal_pending(current))
3942             goto transport_err;
3943
3944 get_immediate:
3945         ret = iscsit_handle_immediate_queue(conn);
3946         if (ret < 0)
3947             goto transport_err;
3948
3949         ret = iscsit_handle_response_queue(conn);
3950         if (ret == 1) {
3951             goto get_immediate;
3952         } else if (ret == -ECONNRESET) {
3953             conn_freed = true;
3954             goto out;
3955         } else if (ret < 0) {
3956             goto transport_err;
3957         }
3958     }
3959
3960 transport_err:
3961     /*
3962      * Avoid the normal connection failure code-path if this connection
3963      * is still within LOGIN mode, and iscsi_np process context is
3964      * responsible for cleaning up the early connection failure.
3965      */
3966     if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3967         iscsit_take_action_for_connection_exit(conn, &conn_freed);
3968 out:
3969     if (!conn_freed) {
3970         while (!kthread_should_stop()) {
3971             msleep(100);
3972         }
3973     }
3974     return 0;
3975 }
3976
3977 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3978 {
3979     struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3980     struct iscsit_cmd *cmd;
3981     int ret = 0;
3982
3983     switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3984     case ISCSI_OP_SCSI_CMD:
3985         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3986         if (!cmd)
3987             goto reject;
3988
3989         ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3990         break;
3991     case ISCSI_OP_SCSI_DATA_OUT:
3992         ret = iscsit_handle_data_out(conn, buf);
3993         break;
3994     case ISCSI_OP_NOOP_OUT:
3995         cmd = NULL;
3996         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3997             cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3998             if (!cmd)
3999                 goto reject;
4000         }
4001         ret = iscsit_handle_nop_out(conn, cmd, buf);
4002         break;
4003     case ISCSI_OP_SCSI_TMFUNC:
4004         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4005         if (!cmd)
4006             goto reject;
4007
4008         ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4009         break;
4010     case ISCSI_OP_TEXT:
4011         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4012             cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4013             if (!cmd)
4014                 goto reject;
4015         } else {
4016             cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4017             if (!cmd)
4018                 goto reject;
4019         }
4020
4021         ret = iscsit_handle_text_cmd(conn, cmd, buf);
4022         break;
4023     case ISCSI_OP_LOGOUT:
4024         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4025         if (!cmd)
4026             goto reject;
4027
4028         ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4029         if (ret > 0)
4030             wait_for_completion_timeout(&conn->conn_logout_comp,
4031                     SECONDS_FOR_LOGOUT_COMP * HZ);
4032         break;
4033     case ISCSI_OP_SNACK:
4034         ret = iscsit_handle_snack(conn, buf);
4035         break;
4036     default:
4037         pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4038         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4039             pr_err("Cannot recover from unknown"
4040             " opcode while ERL=0, closing iSCSI connection.\n");
4041             return -1;
4042         }
4043         pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4044                " closing iSCSI connection.\n");
4045         ret = -1;
4046         break;
4047     }
4048
4049     return ret;
4050 reject:
4051     return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4052 }
4053
4054 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4055 {
4056     bool ret;
4057
4058     spin_lock_bh(&conn->state_lock);
4059     ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4060     spin_unlock_bh(&conn->state_lock);
4061
4062     return ret;
4063 }
4064
4065 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4066 {
4067     int ret;
4068     u8 *buffer, *tmp_buf, opcode;
4069     u32 checksum = 0, digest = 0;
4070     struct iscsi_hdr *hdr;
4071     struct kvec iov;
4072
4073     buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4074     if (!buffer)
4075         return;
4076
4077     while (!kthread_should_stop()) {
4078         /*
4079          * Ensure that both TX and RX per connection kthreads
4080          * are scheduled to run on the same CPU.
4081          */
4082         iscsit_thread_check_cpumask(conn, current, 0);
4083
4084         memset(&iov, 0, sizeof(struct kvec));
4085
4086         iov.iov_base    = buffer;
4087         iov.iov_len = ISCSI_HDR_LEN;
4088
4089         ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4090         if (ret != ISCSI_HDR_LEN) {
4091             iscsit_rx_thread_wait_for_tcp(conn);
4092             break;
4093         }
4094
4095         hdr = (struct iscsi_hdr *) buffer;
4096         if (hdr->hlength) {
4097             iov.iov_len = hdr->hlength * 4;
4098             tmp_buf = krealloc(buffer,
4099                       ISCSI_HDR_LEN + iov.iov_len,
4100                       GFP_KERNEL);
4101             if (!tmp_buf)
4102                 break;
4103
4104             buffer = tmp_buf;
4105             iov.iov_base = &buffer[ISCSI_HDR_LEN];
4106
4107             ret = rx_data(conn, &iov, 1, iov.iov_len);
4108             if (ret != iov.iov_len) {
4109                 iscsit_rx_thread_wait_for_tcp(conn);
4110                 break;
4111             }
4112         }
4113
4114         if (conn->conn_ops->HeaderDigest) {
4115             iov.iov_base    = &digest;
4116             iov.iov_len = ISCSI_CRC_LEN;
4117
4118             ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4119             if (ret != ISCSI_CRC_LEN) {
4120                 iscsit_rx_thread_wait_for_tcp(conn);
4121                 break;
4122             }
4123
4124             iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
4125                           ISCSI_HDR_LEN, 0, NULL,
4126                           &checksum);
4127
4128             if (digest != checksum) {
4129                 pr_err("HeaderDigest CRC32C failed,"
4130                     " received 0x%08x, computed 0x%08x\n",
4131                     digest, checksum);
4132                 /*
4133                  * Set the PDU to 0xff so it will intentionally
4134                  * hit default in the switch below.
4135                  */
4136                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4137                 atomic_long_inc(&conn->sess->conn_digest_errors);
4138             } else {
4139                 pr_debug("Got HeaderDigest CRC32C"
4140                         " 0x%08x\n", checksum);
4141             }
4142         }
4143
4144         if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4145             break;
4146
4147         opcode = buffer[0] & ISCSI_OPCODE_MASK;
4148
4149         if (conn->sess->sess_ops->SessionType &&
4150            ((!(opcode & ISCSI_OP_TEXT)) ||
4151             (!(opcode & ISCSI_OP_LOGOUT)))) {
4152             pr_err("Received illegal iSCSI Opcode: 0x%02x"
4153             " while in Discovery Session, rejecting.\n", opcode);
4154             iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4155                       buffer);
4156             break;
4157         }
4158
4159         ret = iscsi_target_rx_opcode(conn, buffer);
4160         if (ret < 0)
4161             break;
4162     }
4163
4164     kfree(buffer);
4165 }
4166
4167 int iscsi_target_rx_thread(void *arg)
4168 {
4169     int rc;
4170     struct iscsit_conn *conn = arg;
4171     bool conn_freed = false;
4172
4173     /*
4174      * Allow ourselves to be interrupted by SIGINT so that a
4175      * connection recovery / failure event can be triggered externally.
4176      */
4177     allow_signal(SIGINT);
4178     /*
4179      * Wait for iscsi_post_login_handler() to complete before allowing
4180      * incoming iscsi/tcp socket I/O, and/or failing the connection.
4181      */
4182     rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4183     if (rc < 0 || iscsi_target_check_conn_state(conn))
4184         goto out;
4185
4186     if (!conn->conn_transport->iscsit_get_rx_pdu)
4187         return 0;
4188
4189     conn->conn_transport->iscsit_get_rx_pdu(conn);
4190
4191     if (!signal_pending(current))
4192         atomic_set(&conn->transport_failed, 1);
4193     iscsit_take_action_for_connection_exit(conn, &conn_freed);
4194
4195 out:
4196     if (!conn_freed) {
4197         while (!kthread_should_stop()) {
4198             msleep(100);
4199         }
4200     }
4201
4202     return 0;
4203 }
4204
4205 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4206 {
4207     LIST_HEAD(tmp_list);
4208     struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4209     struct iscsit_session *sess = conn->sess;
4210     /*
4211      * We expect this function to only ever be called from either RX or TX
4212      * thread context via iscsit_close_connection() once the other context
4213      * has been reset -> returned sleeping pre-handler state.
4214      */
4215     spin_lock_bh(&conn->cmd_lock);
4216     list_splice_init(&conn->conn_cmd_list, &tmp_list);
4217
4218     list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4219         struct se_cmd *se_cmd = &cmd->se_cmd;
4220
4221         if (se_cmd->se_tfo != NULL) {
4222             spin_lock_irq(&se_cmd->t_state_lock);
4223             if (se_cmd->transport_state & CMD_T_ABORTED) {
4224                 /*
4225                  * LIO's abort path owns the cleanup for this,
4226                  * so put it back on the list and let
4227                  * aborted_task handle it.
4228                  */
4229                 list_move_tail(&cmd->i_conn_node,
4230                            &conn->conn_cmd_list);
4231             } else {
4232                 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4233             }
4234             spin_unlock_irq(&se_cmd->t_state_lock);
4235         }
4236     }
4237     spin_unlock_bh(&conn->cmd_lock);
4238
4239     list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4240         list_del_init(&cmd->i_conn_node);
4241
4242         iscsit_increment_maxcmdsn(cmd, sess);
4243         iscsit_free_cmd(cmd, true);
4244
4245     }
4246 }
4247
4248 static void iscsit_stop_timers_for_cmds(
4249     struct iscsit_conn *conn)
4250 {
4251     struct iscsit_cmd *cmd;
4252
4253     spin_lock_bh(&conn->cmd_lock);
4254     list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4255         if (cmd->data_direction == DMA_TO_DEVICE)
4256             iscsit_stop_dataout_timer(cmd);
4257     }
4258     spin_unlock_bh(&conn->cmd_lock);
4259 }
4260
4261 int iscsit_close_connection(
4262     struct iscsit_conn *conn)
4263 {
4264     int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4265     struct iscsit_session   *sess = conn->sess;
4266
4267     pr_debug("Closing iSCSI connection CID %hu on SID:"
4268         " %u\n", conn->cid, sess->sid);
4269     /*
4270      * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4271      * case just in case the RX Thread in iscsi_target_rx_opcode() is
4272      * sleeping and the logout response never got sent because the
4273      * connection failed.
4274      *
4275      * However for iser-target, isert_wait4logout() is using conn_logout_comp
4276      * to signal logout response TX interrupt completion.  Go ahead and skip
4277      * this for iser since isert_rx_opcode() does not wait on logout failure,
4278      * and to avoid iscsit_conn pointer dereference in iser-target code.
4279      */
4280     if (!conn->conn_transport->rdma_shutdown)
4281         complete(&conn->conn_logout_comp);
4282
4283     if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4284         if (conn->tx_thread &&
4285             cmpxchg(&conn->tx_thread_active, true, false)) {
4286             send_sig(SIGINT, conn->tx_thread, 1);
4287             kthread_stop(conn->tx_thread);
4288         }
4289     } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4290         if (conn->rx_thread &&
4291             cmpxchg(&conn->rx_thread_active, true, false)) {
4292             send_sig(SIGINT, conn->rx_thread, 1);
4293             kthread_stop(conn->rx_thread);
4294         }
4295     }
4296
4297     spin_lock(&iscsit_global->ts_bitmap_lock);
4298     bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4299                   get_order(1));
4300     spin_unlock(&iscsit_global->ts_bitmap_lock);
4301
4302     iscsit_stop_timers_for_cmds(conn);
4303     iscsit_stop_nopin_response_timer(conn);
4304     iscsit_stop_nopin_timer(conn);
4305
4306     if (conn->conn_transport->iscsit_wait_conn)
4307         conn->conn_transport->iscsit_wait_conn(conn);
4308
4309     /*
4310      * During Connection recovery drop unacknowledged out of order
4311      * commands for this connection, and prepare the other commands
4312      * for reallegiance.
4313      *
4314      * During normal operation clear the out of order commands (but
4315      * do not free the struct iscsi_ooo_cmdsn's) and release all
4316      * struct iscsit_cmds.
4317      */
4318     if (atomic_read(&conn->connection_recovery)) {
4319         iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4320         iscsit_prepare_cmds_for_reallegiance(conn);
4321     } else {
4322         iscsit_clear_ooo_cmdsns_for_conn(conn);
4323         iscsit_release_commands_from_conn(conn);
4324     }
4325     iscsit_free_queue_reqs_for_conn(conn);
4326
4327     /*
4328      * Handle decrementing session or connection usage count if
4329      * a logout response was not able to be sent because the
4330      * connection failed.  Fall back to Session Recovery here.
4331      */
4332     if (atomic_read(&conn->conn_logout_remove)) {
4333         if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4334             iscsit_dec_conn_usage_count(conn);
4335             iscsit_dec_session_usage_count(sess);
4336         }
4337         if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4338             iscsit_dec_conn_usage_count(conn);
4339
4340         atomic_set(&conn->conn_logout_remove, 0);
4341         atomic_set(&sess->session_reinstatement, 0);
4342         atomic_set(&sess->session_fall_back_to_erl0, 1);
4343     }
4344
4345     spin_lock_bh(&sess->conn_lock);
4346     list_del(&conn->conn_list);
4347
4348     /*
4349      * Attempt to let the Initiator know this connection failed by
4350      * sending an Connection Dropped Async Message on another
4351      * active connection.
4352      */
4353     if (atomic_read(&conn->connection_recovery))
4354         iscsit_build_conn_drop_async_message(conn);
4355
4356     spin_unlock_bh(&sess->conn_lock);
4357
4358     /*
4359      * If connection reinstatement is being performed on this connection,
4360      * up the connection reinstatement semaphore that is being blocked on
4361      * in iscsit_cause_connection_reinstatement().
4362      */
4363     spin_lock_bh(&conn->state_lock);
4364     if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4365         spin_unlock_bh(&conn->state_lock);
4366         complete(&conn->conn_wait_comp);
4367         wait_for_completion(&conn->conn_post_wait_comp);
4368         spin_lock_bh(&conn->state_lock);
4369     }
4370
4371     /*
4372      * If connection reinstatement is being performed on this connection
4373      * by receiving a REMOVECONNFORRECOVERY logout request, up the
4374      * connection wait rcfr semaphore that is being blocked on
4375      * an iscsit_connection_reinstatement_rcfr().
4376      */
4377     if (atomic_read(&conn->connection_wait_rcfr)) {
4378         spin_unlock_bh(&conn->state_lock);
4379         complete(&conn->conn_wait_rcfr_comp);
4380         wait_for_completion(&conn->conn_post_wait_comp);
4381         spin_lock_bh(&conn->state_lock);
4382     }
4383     atomic_set(&conn->connection_reinstatement, 1);
4384     spin_unlock_bh(&conn->state_lock);
4385
4386     /*
4387      * If any other processes are accessing this connection pointer we
4388      * must wait until they have completed.
4389      */
4390     iscsit_check_conn_usage_count(conn);
4391
4392     ahash_request_free(conn->conn_tx_hash);
4393     if (conn->conn_rx_hash) {
4394         struct crypto_ahash *tfm;
4395
4396         tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4397         ahash_request_free(conn->conn_rx_hash);
4398         crypto_free_ahash(tfm);
4399     }
4400
4401     if (conn->sock)
4402         sock_release(conn->sock);
4403
4404     if (conn->conn_transport->iscsit_free_conn)
4405         conn->conn_transport->iscsit_free_conn(conn);
4406
4407     pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4408     conn->conn_state = TARG_CONN_STATE_FREE;
4409     iscsit_free_conn(conn);
4410
4411     spin_lock_bh(&sess->conn_lock);
4412     atomic_dec(&sess->nconn);
4413     pr_debug("Decremented iSCSI connection count to %d from node:"
4414         " %s\n", atomic_read(&sess->nconn),
4415         sess->sess_ops->InitiatorName);
4416     /*
4417      * Make sure that if one connection fails in an non ERL=2 iSCSI
4418      * Session that they all fail.
4419      */
4420     if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4421          !atomic_read(&sess->session_logout))
4422         atomic_set(&sess->session_fall_back_to_erl0, 1);
4423
4424     /*
4425      * If this was not the last connection in the session, and we are
4426      * performing session reinstatement or falling back to ERL=0, call
4427      * iscsit_stop_session() without sleeping to shutdown the other
4428      * active connections.
4429      */
4430     if (atomic_read(&sess->nconn)) {
4431         if (!atomic_read(&sess->session_reinstatement) &&
4432             !atomic_read(&sess->session_fall_back_to_erl0)) {
4433             spin_unlock_bh(&sess->conn_lock);
4434             return 0;
4435         }
4436         if (!atomic_read(&sess->session_stop_active)) {
4437             atomic_set(&sess->session_stop_active, 1);
4438             spin_unlock_bh(&sess->conn_lock);
4439             iscsit_stop_session(sess, 0, 0);
4440             return 0;
4441         }
4442         spin_unlock_bh(&sess->conn_lock);
4443         return 0;
4444     }
4445
4446     /*
4447      * If this was the last connection in the session and one of the
4448      * following is occurring:
4449      *
4450      * Session Reinstatement is not being performed, and are falling back
4451      * to ERL=0 call iscsit_close_session().
4452      *
4453      * Session Logout was requested.  iscsit_close_session() will be called
4454      * elsewhere.
4455      *
4456      * Session Continuation is not being performed, start the Time2Retain
4457      * handler and check if sleep_on_sess_wait_sem is active.
4458      */
4459     if (!atomic_read(&sess->session_reinstatement) &&
4460          atomic_read(&sess->session_fall_back_to_erl0)) {
4461         spin_unlock_bh(&sess->conn_lock);
4462         complete_all(&sess->session_wait_comp);
4463         iscsit_close_session(sess, true);
4464
4465         return 0;
4466     } else if (atomic_read(&sess->session_logout)) {
4467         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4468         sess->session_state = TARG_SESS_STATE_FREE;
4469
4470         if (atomic_read(&sess->session_close)) {
4471             spin_unlock_bh(&sess->conn_lock);
4472             complete_all(&sess->session_wait_comp);
4473             iscsit_close_session(sess, true);
4474         } else {
4475             spin_unlock_bh(&sess->conn_lock);
4476         }
4477
4478         return 0;
4479     } else {
4480         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4481         sess->session_state = TARG_SESS_STATE_FAILED;
4482
4483         if (!atomic_read(&sess->session_continuation))
4484             iscsit_start_time2retain_handler(sess);
4485
4486         if (atomic_read(&sess->session_close)) {
4487             spin_unlock_bh(&sess->conn_lock);
4488             complete_all(&sess->session_wait_comp);
4489             iscsit_close_session(sess, true);
4490         } else {
4491             spin_unlock_bh(&sess->conn_lock);
4492         }
4493
4494         return 0;
4495     }
4496 }
4497
4498 /*
4499  * If the iSCSI Session for the iSCSI Initiator Node exists,
4500  * forcefully shutdown the iSCSI NEXUS.
4501  */
4502 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4503 {
4504     struct iscsi_portal_group *tpg = sess->tpg;
4505     struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4506
4507     if (atomic_read(&sess->nconn)) {
4508         pr_err("%d connection(s) still exist for iSCSI session"
4509             " to %s\n", atomic_read(&sess->nconn),
4510             sess->sess_ops->InitiatorName);
4511         BUG();
4512     }
4513
4514     spin_lock_bh(&se_tpg->session_lock);
4515     atomic_set(&sess->session_logout, 1);
4516     atomic_set(&sess->session_reinstatement, 1);
4517     iscsit_stop_time2retain_timer(sess);
4518     spin_unlock_bh(&se_tpg->session_lock);
4519
4520     /*
4521      * transport_deregister_session_configfs() will clear the
4522      * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4523      * can be setting it again with __transport_register_session() in
4524      * iscsi_post_login_handler() again after the iscsit_stop_session()
4525      * completes in iscsi_np context.
4526      */
4527     transport_deregister_session_configfs(sess->se_sess);
4528
4529     /*
4530      * If any other processes are accessing this session pointer we must
4531      * wait until they have completed.  If we are in an interrupt (the
4532      * time2retain handler) and contain and active session usage count we
4533      * restart the timer and exit.
4534      */
4535     if (iscsit_check_session_usage_count(sess, can_sleep)) {
4536         atomic_set(&sess->session_logout, 0);
4537         iscsit_start_time2retain_handler(sess);
4538         return 0;
4539     }
4540
4541     transport_deregister_session(sess->se_sess);
4542
4543     if (sess->sess_ops->ErrorRecoveryLevel == 2)
4544         iscsit_free_connection_recovery_entries(sess);
4545
4546     iscsit_free_all_ooo_cmdsns(sess);
4547
4548     spin_lock_bh(&se_tpg->session_lock);
4549     pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4550     sess->session_state = TARG_SESS_STATE_FREE;
4551     pr_debug("Released iSCSI session from node: %s\n",
4552             sess->sess_ops->InitiatorName);
4553     tpg->nsessions--;
4554     if (tpg->tpg_tiqn)
4555         tpg->tpg_tiqn->tiqn_nsessions--;
4556
4557     pr_debug("Decremented number of active iSCSI Sessions on"
4558         " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4559
4560     ida_free(&sess_ida, sess->session_index);
4561     kfree(sess->sess_ops);
4562     sess->sess_ops = NULL;
4563     spin_unlock_bh(&se_tpg->session_lock);
4564
4565     kfree(sess);
4566     return 0;
4567 }
4568
4569 static void iscsit_logout_post_handler_closesession(
4570     struct iscsit_conn *conn)
4571 {
4572     struct iscsit_session *sess = conn->sess;
4573     int sleep = 1;
4574     /*
4575      * Traditional iscsi/tcp will invoke this logic from TX thread
4576      * context during session logout, so clear tx_thread_active and
4577      * sleep if iscsit_close_connection() has not already occured.
4578      *
4579      * Since iser-target invokes this logic from it's own workqueue,
4580      * always sleep waiting for RX/TX thread shutdown to complete
4581      * within iscsit_close_connection().
4582      */
4583     if (!conn->conn_transport->rdma_shutdown) {
4584         sleep = cmpxchg(&conn->tx_thread_active, true, false);
4585         if (!sleep)
4586             return;
4587     }
4588
4589     atomic_set(&conn->conn_logout_remove, 0);
4590     complete(&conn->conn_logout_comp);
4591
4592     iscsit_dec_conn_usage_count(conn);
4593     atomic_set(&sess->session_close, 1);
4594     iscsit_stop_session(sess, sleep, sleep);
4595     iscsit_dec_session_usage_count(sess);
4596 }
4597
4598 static void iscsit_logout_post_handler_samecid(
4599     struct iscsit_conn *conn)
4600 {
4601     int sleep = 1;
4602
4603     if (!conn->conn_transport->rdma_shutdown) {
4604         sleep = cmpxchg(&conn->tx_thread_active, true, false);
4605         if (!sleep)
4606             return;
4607     }
4608
4609     atomic_set(&conn->conn_logout_remove, 0);
4610     complete(&conn->conn_logout_comp);
4611
4612     iscsit_cause_connection_reinstatement(conn, sleep);
4613     iscsit_dec_conn_usage_count(conn);
4614 }
4615
4616 static void iscsit_logout_post_handler_diffcid(
4617     struct iscsit_conn *conn,
4618     u16 cid)
4619 {
4620     struct iscsit_conn *l_conn;
4621     struct iscsit_session *sess = conn->sess;
4622     bool conn_found = false;
4623
4624     if (!sess)
4625         return;
4626
4627     spin_lock_bh(&sess->conn_lock);
4628     list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4629         if (l_conn->cid == cid) {
4630             iscsit_inc_conn_usage_count(l_conn);
4631             conn_found = true;
4632             break;
4633         }
4634     }
4635     spin_unlock_bh(&sess->conn_lock);
4636
4637     if (!conn_found)
4638         return;
4639
4640     if (l_conn->sock)
4641         l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4642
4643     spin_lock_bh(&l_conn->state_lock);
4644     pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4645     l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4646     spin_unlock_bh(&l_conn->state_lock);
4647
4648     iscsit_cause_connection_reinstatement(l_conn, 1);
4649     iscsit_dec_conn_usage_count(l_conn);
4650 }
4651
4652 /*
4653  *  Return of 0 causes the TX thread to restart.
4654  */
4655 int iscsit_logout_post_handler(
4656     struct iscsit_cmd *cmd,
4657     struct iscsit_conn *conn)
4658 {
4659     int ret = 0;
4660
4661     switch (cmd->logout_reason) {
4662     case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4663         switch (cmd->logout_response) {
4664         case ISCSI_LOGOUT_SUCCESS:
4665         case ISCSI_LOGOUT_CLEANUP_FAILED:
4666         default:
4667             iscsit_logout_post_handler_closesession(conn);
4668             break;
4669         }
4670         break;
4671     case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4672         if (conn->cid == cmd->logout_cid) {
4673             switch (cmd->logout_response) {
4674             case ISCSI_LOGOUT_SUCCESS:
4675             case ISCSI_LOGOUT_CLEANUP_FAILED:
4676             default:
4677                 iscsit_logout_post_handler_samecid(conn);
4678                 break;
4679             }
4680         } else {
4681             switch (cmd->logout_response) {
4682             case ISCSI_LOGOUT_SUCCESS:
4683                 iscsit_logout_post_handler_diffcid(conn,
4684                     cmd->logout_cid);
4685                 break;
4686             case ISCSI_LOGOUT_CID_NOT_FOUND:
4687             case ISCSI_LOGOUT_CLEANUP_FAILED:
4688             default:
4689                 break;
4690             }
4691             ret = 1;
4692         }
4693         break;
4694     case ISCSI_LOGOUT_REASON_RECOVERY:
4695         switch (cmd->logout_response) {
4696         case ISCSI_LOGOUT_SUCCESS:
4697         case ISCSI_LOGOUT_CID_NOT_FOUND:
4698         case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4699         case ISCSI_LOGOUT_CLEANUP_FAILED:
4700         default:
4701             break;
4702         }
4703         ret = 1;
4704         break;
4705     default:
4706         break;
4707
4708     }
4709     return ret;
4710 }
4711 EXPORT_SYMBOL(iscsit_logout_post_handler);
4712
4713 void iscsit_fail_session(struct iscsit_session *sess)
4714 {
4715     struct iscsit_conn *conn;
4716
4717     spin_lock_bh(&sess->conn_lock);
4718     list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4719         pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4720         conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4721     }
4722     spin_unlock_bh(&sess->conn_lock);
4723
4724     pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4725     sess->session_state = TARG_SESS_STATE_FAILED;
4726 }
4727
4728 void iscsit_stop_session(
4729     struct iscsit_session *sess,
4730     int session_sleep,
4731     int connection_sleep)
4732 {
4733     u16 conn_count = atomic_read(&sess->nconn);
4734     struct iscsit_conn *conn, *conn_tmp = NULL;
4735     int is_last;
4736
4737     spin_lock_bh(&sess->conn_lock);
4738
4739     if (connection_sleep) {
4740         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4741                 conn_list) {
4742             if (conn_count == 0)
4743                 break;
4744
4745             if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4746                 is_last = 1;
4747             } else {
4748                 iscsit_inc_conn_usage_count(conn_tmp);
4749                 is_last = 0;
4750             }
4751             iscsit_inc_conn_usage_count(conn);
4752
4753             spin_unlock_bh(&sess->conn_lock);
4754             iscsit_cause_connection_reinstatement(conn, 1);
4755             spin_lock_bh(&sess->conn_lock);
4756
4757             iscsit_dec_conn_usage_count(conn);
4758             if (is_last == 0)
4759                 iscsit_dec_conn_usage_count(conn_tmp);
4760             conn_count--;
4761         }
4762     } else {
4763         list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4764             iscsit_cause_connection_reinstatement(conn, 0);
4765     }
4766
4767     if (session_sleep && atomic_read(&sess->nconn)) {
4768         spin_unlock_bh(&sess->conn_lock);
4769         wait_for_completion(&sess->session_wait_comp);
4770     } else
4771         spin_unlock_bh(&sess->conn_lock);
4772 }
4773
4774 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4775 {
4776     struct iscsit_session *sess;
4777     struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4778     struct se_session *se_sess, *se_sess_tmp;
4779     LIST_HEAD(free_list);
4780     int session_count = 0;
4781
4782     spin_lock_bh(&se_tpg->session_lock);
4783     if (tpg->nsessions && !force) {
4784         spin_unlock_bh(&se_tpg->session_lock);
4785         return -1;
4786     }
4787
4788     list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4789             sess_list) {
4790         sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4791
4792         spin_lock(&sess->conn_lock);
4793         if (atomic_read(&sess->session_fall_back_to_erl0) ||
4794             atomic_read(&sess->session_logout) ||
4795             atomic_read(&sess->session_close) ||
4796             (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4797             spin_unlock(&sess->conn_lock);
4798             continue;
4799         }
4800         iscsit_inc_session_usage_count(sess);
4801         atomic_set(&sess->session_reinstatement, 1);
4802         atomic_set(&sess->session_fall_back_to_erl0, 1);
4803         atomic_set(&sess->session_close, 1);
4804         spin_unlock(&sess->conn_lock);
4805
4806         list_move_tail(&se_sess->sess_list, &free_list);
4807     }
4808     spin_unlock_bh(&se_tpg->session_lock);
4809
4810     list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4811         sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4812
4813         list_del_init(&se_sess->sess_list);
4814         iscsit_stop_session(sess, 1, 1);
4815         iscsit_dec_session_usage_count(sess);
4816         session_count++;
4817     }
4818
4819     pr_debug("Released %d iSCSI Session(s) from Target Portal"
4820             " Group: %hu\n", session_count, tpg->tpgt);
4821     return 0;
4822 }
4823
4824 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4825 MODULE_VERSION("4.1.x");
4826 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4827 MODULE_LICENSE("GPL");
4828
4829 module_init(iscsi_target_init_module);
4830 module_exit(iscsi_target_cleanup_module);