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0001 /*
0002  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
0003  *
0004  * Copyright (c) 2010-2015 Chelsio Communications, Inc.
0005  *
0006  * This program is free software; you can redistribute it and/or modify
0007  * it under the terms of the GNU General Public License as published by
0008  * the Free Software Foundation.
0009  *
0010  * Written by: Karen Xie (kxie@chelsio.com)
0011  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
0012  */
0013 
0014 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
0015 
0016 #include <linux/skbuff.h>
0017 #include <linux/crypto.h>
0018 #include <linux/scatterlist.h>
0019 #include <linux/pci.h>
0020 #include <scsi/scsi.h>
0021 #include <scsi/scsi_cmnd.h>
0022 #include <scsi/scsi_host.h>
0023 #include <linux/if_vlan.h>
0024 #include <linux/inet.h>
0025 #include <net/dst.h>
0026 #include <net/route.h>
0027 #include <net/ipv6.h>
0028 #include <net/ip6_route.h>
0029 #include <net/addrconf.h>
0030 
0031 #include <linux/inetdevice.h>   /* ip_dev_find */
0032 #include <linux/module.h>
0033 #include <net/tcp.h>
0034 
0035 static unsigned int dbg_level;
0036 
0037 #include "libcxgbi.h"
0038 
0039 #define DRV_MODULE_NAME     "libcxgbi"
0040 #define DRV_MODULE_DESC     "Chelsio iSCSI driver library"
0041 #define DRV_MODULE_VERSION  "0.9.1-ko"
0042 #define DRV_MODULE_RELDATE  "Apr. 2015"
0043 
0044 static char version[] =
0045     DRV_MODULE_DESC " " DRV_MODULE_NAME
0046     " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
0047 
0048 MODULE_AUTHOR("Chelsio Communications, Inc.");
0049 MODULE_DESCRIPTION(DRV_MODULE_DESC);
0050 MODULE_VERSION(DRV_MODULE_VERSION);
0051 MODULE_LICENSE("GPL");
0052 
0053 module_param(dbg_level, uint, 0644);
0054 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
0055 
0056 
0057 /*
0058  * cxgbi device management
0059  * maintains a list of the cxgbi devices
0060  */
0061 static LIST_HEAD(cdev_list);
0062 static DEFINE_MUTEX(cdev_mutex);
0063 
0064 static LIST_HEAD(cdev_rcu_list);
0065 static DEFINE_SPINLOCK(cdev_rcu_lock);
0066 
0067 static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
0068 {
0069     if (age)
0070         *age = sw_tag & 0x7FFF;
0071     if (idx)
0072         *idx = (sw_tag >> 16) & 0x7FFF;
0073 }
0074 
0075 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
0076                 unsigned int max_conn)
0077 {
0078     struct cxgbi_ports_map *pmap = &cdev->pmap;
0079 
0080     pmap->port_csk = kvzalloc(array_size(max_conn,
0081                          sizeof(struct cxgbi_sock *)),
0082                   GFP_KERNEL | __GFP_NOWARN);
0083     if (!pmap->port_csk) {
0084         pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
0085         return -ENOMEM;
0086     }
0087 
0088     pmap->max_connect = max_conn;
0089     pmap->sport_base = base;
0090     spin_lock_init(&pmap->lock);
0091     return 0;
0092 }
0093 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
0094 
0095 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
0096 {
0097     struct cxgbi_ports_map *pmap = &cdev->pmap;
0098     struct cxgbi_sock *csk;
0099     int i;
0100 
0101     for (i = 0; i < pmap->max_connect; i++) {
0102         if (pmap->port_csk[i]) {
0103             csk = pmap->port_csk[i];
0104             pmap->port_csk[i] = NULL;
0105             log_debug(1 << CXGBI_DBG_SOCK,
0106                 "csk 0x%p, cdev 0x%p, offload down.\n",
0107                 csk, cdev);
0108             spin_lock_bh(&csk->lock);
0109             cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
0110             cxgbi_sock_closed(csk);
0111             spin_unlock_bh(&csk->lock);
0112             cxgbi_sock_put(csk);
0113         }
0114     }
0115 }
0116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
0117 
0118 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
0119 {
0120     log_debug(1 << CXGBI_DBG_DEV,
0121         "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
0122     cxgbi_hbas_remove(cdev);
0123     cxgbi_device_portmap_cleanup(cdev);
0124     if (cdev->cdev2ppm)
0125         cxgbi_ppm_release(cdev->cdev2ppm(cdev));
0126     if (cdev->pmap.max_connect)
0127         kvfree(cdev->pmap.port_csk);
0128     kfree(cdev);
0129 }
0130 
0131 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
0132                        unsigned int nports)
0133 {
0134     struct cxgbi_device *cdev;
0135 
0136     cdev = kzalloc(sizeof(*cdev) + extra + nports *
0137             (sizeof(struct cxgbi_hba *) +
0138              sizeof(struct net_device *)),
0139             GFP_KERNEL);
0140     if (!cdev) {
0141         pr_warn("nport %d, OOM.\n", nports);
0142         return NULL;
0143     }
0144     cdev->ports = (struct net_device **)(cdev + 1);
0145     cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
0146                         sizeof(struct net_device *));
0147     if (extra)
0148         cdev->dd_data = ((char *)cdev->hbas) +
0149                 nports * sizeof(struct cxgbi_hba *);
0150     spin_lock_init(&cdev->pmap.lock);
0151 
0152     mutex_lock(&cdev_mutex);
0153     list_add_tail(&cdev->list_head, &cdev_list);
0154     mutex_unlock(&cdev_mutex);
0155 
0156     spin_lock(&cdev_rcu_lock);
0157     list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
0158     spin_unlock(&cdev_rcu_lock);
0159 
0160     log_debug(1 << CXGBI_DBG_DEV,
0161         "cdev 0x%p, p# %u.\n", cdev, nports);
0162     return cdev;
0163 }
0164 EXPORT_SYMBOL_GPL(cxgbi_device_register);
0165 
0166 void cxgbi_device_unregister(struct cxgbi_device *cdev)
0167 {
0168     log_debug(1 << CXGBI_DBG_DEV,
0169         "cdev 0x%p, p# %u,%s.\n",
0170         cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
0171 
0172     mutex_lock(&cdev_mutex);
0173     list_del(&cdev->list_head);
0174     mutex_unlock(&cdev_mutex);
0175 
0176     spin_lock(&cdev_rcu_lock);
0177     list_del_rcu(&cdev->rcu_node);
0178     spin_unlock(&cdev_rcu_lock);
0179     synchronize_rcu();
0180 
0181     cxgbi_device_destroy(cdev);
0182 }
0183 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
0184 
0185 void cxgbi_device_unregister_all(unsigned int flag)
0186 {
0187     struct cxgbi_device *cdev, *tmp;
0188 
0189     mutex_lock(&cdev_mutex);
0190     list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
0191         if ((cdev->flags & flag) == flag) {
0192             mutex_unlock(&cdev_mutex);
0193             cxgbi_device_unregister(cdev);
0194             mutex_lock(&cdev_mutex);
0195         }
0196     }
0197     mutex_unlock(&cdev_mutex);
0198 }
0199 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
0200 
0201 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
0202 {
0203     struct cxgbi_device *cdev, *tmp;
0204 
0205     mutex_lock(&cdev_mutex);
0206     list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
0207         if (cdev->lldev == lldev) {
0208             mutex_unlock(&cdev_mutex);
0209             return cdev;
0210         }
0211     }
0212     mutex_unlock(&cdev_mutex);
0213 
0214     log_debug(1 << CXGBI_DBG_DEV,
0215         "lldev 0x%p, NO match found.\n", lldev);
0216     return NULL;
0217 }
0218 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
0219 
0220 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
0221                          int *port)
0222 {
0223     struct net_device *vdev = NULL;
0224     struct cxgbi_device *cdev, *tmp;
0225     int i;
0226 
0227     if (is_vlan_dev(ndev)) {
0228         vdev = ndev;
0229         ndev = vlan_dev_real_dev(ndev);
0230         log_debug(1 << CXGBI_DBG_DEV,
0231             "vlan dev %s -> %s.\n", vdev->name, ndev->name);
0232     }
0233 
0234     mutex_lock(&cdev_mutex);
0235     list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
0236         for (i = 0; i < cdev->nports; i++) {
0237             if (ndev == cdev->ports[i]) {
0238                 cdev->hbas[i]->vdev = vdev;
0239                 mutex_unlock(&cdev_mutex);
0240                 if (port)
0241                     *port = i;
0242                 return cdev;
0243             }
0244         }
0245     }
0246     mutex_unlock(&cdev_mutex);
0247     log_debug(1 << CXGBI_DBG_DEV,
0248         "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
0249     return NULL;
0250 }
0251 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
0252 
0253 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
0254                              int *port)
0255 {
0256     struct net_device *vdev = NULL;
0257     struct cxgbi_device *cdev;
0258     int i;
0259 
0260     if (is_vlan_dev(ndev)) {
0261         vdev = ndev;
0262         ndev = vlan_dev_real_dev(ndev);
0263         pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
0264     }
0265 
0266     rcu_read_lock();
0267     list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
0268         for (i = 0; i < cdev->nports; i++) {
0269             if (ndev == cdev->ports[i]) {
0270                 cdev->hbas[i]->vdev = vdev;
0271                 rcu_read_unlock();
0272                 if (port)
0273                     *port = i;
0274                 return cdev;
0275             }
0276         }
0277     }
0278     rcu_read_unlock();
0279 
0280     log_debug(1 << CXGBI_DBG_DEV,
0281           "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
0282     return NULL;
0283 }
0284 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
0285 
0286 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
0287                              int *port)
0288 {
0289     struct net_device *vdev = NULL;
0290     struct cxgbi_device *cdev, *tmp;
0291     int i;
0292 
0293     if (is_vlan_dev(ndev)) {
0294         vdev = ndev;
0295         ndev = vlan_dev_real_dev(ndev);
0296         pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
0297     }
0298 
0299     mutex_lock(&cdev_mutex);
0300     list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
0301         for (i = 0; i < cdev->nports; i++) {
0302             if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
0303                     MAX_ADDR_LEN)) {
0304                 cdev->hbas[i]->vdev = vdev;
0305                 mutex_unlock(&cdev_mutex);
0306                 if (port)
0307                     *port = i;
0308                 return cdev;
0309             }
0310         }
0311     }
0312     mutex_unlock(&cdev_mutex);
0313     log_debug(1 << CXGBI_DBG_DEV,
0314           "ndev 0x%p, %s, NO match mac found.\n",
0315           ndev, ndev->name);
0316     return NULL;
0317 }
0318 
0319 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
0320 {
0321     int i;
0322     struct cxgbi_hba *chba;
0323 
0324     log_debug(1 << CXGBI_DBG_DEV,
0325         "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
0326 
0327     for (i = 0; i < cdev->nports; i++) {
0328         chba = cdev->hbas[i];
0329         if (chba) {
0330             cdev->hbas[i] = NULL;
0331             iscsi_host_remove(chba->shost, false);
0332             pci_dev_put(cdev->pdev);
0333             iscsi_host_free(chba->shost);
0334         }
0335     }
0336 }
0337 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
0338 
0339 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
0340         unsigned int max_conns, struct scsi_host_template *sht,
0341         struct scsi_transport_template *stt)
0342 {
0343     struct cxgbi_hba *chba;
0344     struct Scsi_Host *shost;
0345     int i, err;
0346 
0347     log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
0348 
0349     for (i = 0; i < cdev->nports; i++) {
0350         shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
0351         if (!shost) {
0352             pr_info("0x%p, p%d, %s, host alloc failed.\n",
0353                 cdev, i, cdev->ports[i]->name);
0354             err = -ENOMEM;
0355             goto err_out;
0356         }
0357 
0358         shost->transportt = stt;
0359         shost->max_lun = max_lun;
0360         shost->max_id = max_conns - 1;
0361         shost->max_channel = 0;
0362         shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
0363 
0364         chba = iscsi_host_priv(shost);
0365         chba->cdev = cdev;
0366         chba->ndev = cdev->ports[i];
0367         chba->shost = shost;
0368 
0369         shost->can_queue = sht->can_queue - ISCSI_MGMT_CMDS_MAX;
0370 
0371         log_debug(1 << CXGBI_DBG_DEV,
0372             "cdev 0x%p, p#%d %s: chba 0x%p.\n",
0373             cdev, i, cdev->ports[i]->name, chba);
0374 
0375         pci_dev_get(cdev->pdev);
0376         err = iscsi_host_add(shost, &cdev->pdev->dev);
0377         if (err) {
0378             pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
0379                 cdev, i, cdev->ports[i]->name);
0380             pci_dev_put(cdev->pdev);
0381             scsi_host_put(shost);
0382             goto  err_out;
0383         }
0384 
0385         cdev->hbas[i] = chba;
0386     }
0387 
0388     return 0;
0389 
0390 err_out:
0391     cxgbi_hbas_remove(cdev);
0392     return err;
0393 }
0394 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
0395 
0396 /*
0397  * iSCSI offload
0398  *
0399  * - source port management
0400  *   To find a free source port in the port allocation map we use a very simple
0401  *   rotor scheme to look for the next free port.
0402  *
0403  *   If a source port has been specified make sure that it doesn't collide with
0404  *   our normal source port allocation map.  If it's outside the range of our
0405  *   allocation/deallocation scheme just let them use it.
0406  *
0407  *   If the source port is outside our allocation range, the caller is
0408  *   responsible for keeping track of their port usage.
0409  */
0410 
0411 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
0412                         unsigned char port_id)
0413 {
0414     struct cxgbi_ports_map *pmap = &cdev->pmap;
0415     unsigned int i;
0416     unsigned int used;
0417 
0418     if (!pmap->max_connect || !pmap->used)
0419         return NULL;
0420 
0421     spin_lock_bh(&pmap->lock);
0422     used = pmap->used;
0423     for (i = 0; used && i < pmap->max_connect; i++) {
0424         struct cxgbi_sock *csk = pmap->port_csk[i];
0425 
0426         if (csk) {
0427             if (csk->port_id == port_id) {
0428                 spin_unlock_bh(&pmap->lock);
0429                 return csk;
0430             }
0431             used--;
0432         }
0433     }
0434     spin_unlock_bh(&pmap->lock);
0435 
0436     return NULL;
0437 }
0438 
0439 static int sock_get_port(struct cxgbi_sock *csk)
0440 {
0441     struct cxgbi_device *cdev = csk->cdev;
0442     struct cxgbi_ports_map *pmap = &cdev->pmap;
0443     unsigned int start;
0444     int idx;
0445     __be16 *port;
0446 
0447     if (!pmap->max_connect) {
0448         pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
0449                cdev, csk->port_id, cdev->ports[csk->port_id]->name);
0450         return -EADDRNOTAVAIL;
0451     }
0452 
0453     if (csk->csk_family == AF_INET)
0454         port = &csk->saddr.sin_port;
0455     else /* ipv6 */
0456         port = &csk->saddr6.sin6_port;
0457 
0458     if (*port) {
0459         pr_err("source port NON-ZERO %u.\n",
0460             ntohs(*port));
0461         return -EADDRINUSE;
0462     }
0463 
0464     spin_lock_bh(&pmap->lock);
0465     if (pmap->used >= pmap->max_connect) {
0466         spin_unlock_bh(&pmap->lock);
0467         pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
0468             cdev, csk->port_id, cdev->ports[csk->port_id]->name);
0469         return -EADDRNOTAVAIL;
0470     }
0471 
0472     start = idx = pmap->next;
0473     do {
0474         if (++idx >= pmap->max_connect)
0475             idx = 0;
0476         if (!pmap->port_csk[idx]) {
0477             pmap->used++;
0478             *port = htons(pmap->sport_base + idx);
0479             pmap->next = idx;
0480             pmap->port_csk[idx] = csk;
0481             spin_unlock_bh(&pmap->lock);
0482             cxgbi_sock_get(csk);
0483             log_debug(1 << CXGBI_DBG_SOCK,
0484                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
0485                 cdev, csk->port_id,
0486                 cdev->ports[csk->port_id]->name,
0487                 pmap->sport_base + idx, pmap->next);
0488             return 0;
0489         }
0490     } while (idx != start);
0491     spin_unlock_bh(&pmap->lock);
0492 
0493     /* should not happen */
0494     pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
0495         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
0496         pmap->next);
0497     return -EADDRNOTAVAIL;
0498 }
0499 
0500 static void sock_put_port(struct cxgbi_sock *csk)
0501 {
0502     struct cxgbi_device *cdev = csk->cdev;
0503     struct cxgbi_ports_map *pmap = &cdev->pmap;
0504     __be16 *port;
0505 
0506     if (csk->csk_family == AF_INET)
0507         port = &csk->saddr.sin_port;
0508     else /* ipv6 */
0509         port = &csk->saddr6.sin6_port;
0510 
0511     if (*port) {
0512         int idx = ntohs(*port) - pmap->sport_base;
0513 
0514         *port = 0;
0515         if (idx < 0 || idx >= pmap->max_connect) {
0516             pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
0517                 cdev, csk->port_id,
0518                 cdev->ports[csk->port_id]->name,
0519                 ntohs(*port));
0520             return;
0521         }
0522 
0523         spin_lock_bh(&pmap->lock);
0524         pmap->port_csk[idx] = NULL;
0525         pmap->used--;
0526         spin_unlock_bh(&pmap->lock);
0527 
0528         log_debug(1 << CXGBI_DBG_SOCK,
0529             "cdev 0x%p, p#%u %s, release %u.\n",
0530             cdev, csk->port_id, cdev->ports[csk->port_id]->name,
0531             pmap->sport_base + idx);
0532 
0533         cxgbi_sock_put(csk);
0534     }
0535 }
0536 
0537 /*
0538  * iscsi tcp connection
0539  */
0540 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
0541 {
0542     if (csk->cpl_close) {
0543         kfree_skb(csk->cpl_close);
0544         csk->cpl_close = NULL;
0545     }
0546     if (csk->cpl_abort_req) {
0547         kfree_skb(csk->cpl_abort_req);
0548         csk->cpl_abort_req = NULL;
0549     }
0550     if (csk->cpl_abort_rpl) {
0551         kfree_skb(csk->cpl_abort_rpl);
0552         csk->cpl_abort_rpl = NULL;
0553     }
0554 }
0555 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
0556 
0557 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
0558 {
0559     struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
0560 
0561     if (!csk) {
0562         pr_info("alloc csk %zu failed.\n", sizeof(*csk));
0563         return NULL;
0564     }
0565 
0566     if (cdev->csk_alloc_cpls(csk) < 0) {
0567         pr_info("csk 0x%p, alloc cpls failed.\n", csk);
0568         kfree(csk);
0569         return NULL;
0570     }
0571 
0572     spin_lock_init(&csk->lock);
0573     kref_init(&csk->refcnt);
0574     skb_queue_head_init(&csk->receive_queue);
0575     skb_queue_head_init(&csk->write_queue);
0576     timer_setup(&csk->retry_timer, NULL, 0);
0577     init_completion(&csk->cmpl);
0578     rwlock_init(&csk->callback_lock);
0579     csk->cdev = cdev;
0580     csk->flags = 0;
0581     cxgbi_sock_set_state(csk, CTP_CLOSED);
0582 
0583     log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
0584 
0585     return csk;
0586 }
0587 
0588 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
0589                       __be32 saddr, __be32 daddr,
0590                       __be16 sport, __be16 dport, u8 tos,
0591                       int ifindex)
0592 {
0593     struct rtable *rt;
0594 
0595     rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
0596                    dport, sport, IPPROTO_TCP, tos, ifindex);
0597     if (IS_ERR(rt))
0598         return NULL;
0599 
0600     return rt;
0601 }
0602 
0603 static struct cxgbi_sock *
0604 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
0605 {
0606     struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
0607     struct dst_entry *dst;
0608     struct net_device *ndev;
0609     struct cxgbi_device *cdev;
0610     struct rtable *rt = NULL;
0611     struct neighbour *n;
0612     struct flowi4 fl4;
0613     struct cxgbi_sock *csk = NULL;
0614     unsigned int mtu = 0;
0615     int port = 0xFFFF;
0616     int err = 0;
0617 
0618     rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
0619                  daddr->sin_port, 0, ifindex);
0620     if (!rt) {
0621         pr_info("no route to ipv4 0x%x, port %u.\n",
0622             be32_to_cpu(daddr->sin_addr.s_addr),
0623             be16_to_cpu(daddr->sin_port));
0624         err = -ENETUNREACH;
0625         goto err_out;
0626     }
0627     dst = &rt->dst;
0628     n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
0629     if (!n) {
0630         err = -ENODEV;
0631         goto rel_rt;
0632     }
0633     ndev = n->dev;
0634 
0635     if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
0636         pr_info("multi-cast route %pI4, port %u, dev %s.\n",
0637             &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
0638             ndev->name);
0639         err = -ENETUNREACH;
0640         goto rel_neigh;
0641     }
0642 
0643     if (ndev->flags & IFF_LOOPBACK) {
0644         ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
0645         if (!ndev) {
0646             err = -ENETUNREACH;
0647             goto rel_neigh;
0648         }
0649         mtu = ndev->mtu;
0650         pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
0651             n->dev->name, ndev->name, mtu);
0652     }
0653 
0654     if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
0655         pr_info("%s interface not up.\n", ndev->name);
0656         err = -ENETDOWN;
0657         goto rel_neigh;
0658     }
0659 
0660     cdev = cxgbi_device_find_by_netdev(ndev, &port);
0661     if (!cdev)
0662         cdev = cxgbi_device_find_by_mac(ndev, &port);
0663     if (!cdev) {
0664         pr_info("dst %pI4, %s, NOT cxgbi device.\n",
0665             &daddr->sin_addr.s_addr, ndev->name);
0666         err = -ENETUNREACH;
0667         goto rel_neigh;
0668     }
0669     log_debug(1 << CXGBI_DBG_SOCK,
0670         "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
0671         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
0672                port, ndev->name, cdev);
0673 
0674     csk = cxgbi_sock_create(cdev);
0675     if (!csk) {
0676         err = -ENOMEM;
0677         goto rel_neigh;
0678     }
0679     csk->cdev = cdev;
0680     csk->port_id = port;
0681     csk->mtu = mtu;
0682     csk->dst = dst;
0683 
0684     csk->csk_family = AF_INET;
0685     csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
0686     csk->daddr.sin_port = daddr->sin_port;
0687     csk->daddr.sin_family = daddr->sin_family;
0688     csk->saddr.sin_family = daddr->sin_family;
0689     csk->saddr.sin_addr.s_addr = fl4.saddr;
0690     neigh_release(n);
0691 
0692     return csk;
0693 
0694 rel_neigh:
0695     neigh_release(n);
0696 
0697 rel_rt:
0698     ip_rt_put(rt);
0699 err_out:
0700     return ERR_PTR(err);
0701 }
0702 
0703 #if IS_ENABLED(CONFIG_IPV6)
0704 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
0705                     const struct in6_addr *daddr,
0706                     int ifindex)
0707 {
0708     struct flowi6 fl;
0709 
0710     memset(&fl, 0, sizeof(fl));
0711     fl.flowi6_oif = ifindex;
0712     if (saddr)
0713         memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
0714     if (daddr)
0715         memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
0716     return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
0717 }
0718 
0719 static struct cxgbi_sock *
0720 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
0721 {
0722     struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
0723     struct dst_entry *dst;
0724     struct net_device *ndev;
0725     struct cxgbi_device *cdev;
0726     struct rt6_info *rt = NULL;
0727     struct neighbour *n;
0728     struct in6_addr pref_saddr;
0729     struct cxgbi_sock *csk = NULL;
0730     unsigned int mtu = 0;
0731     int port = 0xFFFF;
0732     int err = 0;
0733 
0734     rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
0735 
0736     if (!rt) {
0737         pr_info("no route to ipv6 %pI6 port %u\n",
0738             daddr6->sin6_addr.s6_addr,
0739             be16_to_cpu(daddr6->sin6_port));
0740         err = -ENETUNREACH;
0741         goto err_out;
0742     }
0743 
0744     dst = &rt->dst;
0745 
0746     n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
0747 
0748     if (!n) {
0749         pr_info("%pI6, port %u, dst no neighbour.\n",
0750             daddr6->sin6_addr.s6_addr,
0751             be16_to_cpu(daddr6->sin6_port));
0752         err = -ENETUNREACH;
0753         goto rel_rt;
0754     }
0755     ndev = n->dev;
0756 
0757     if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
0758         pr_info("%s interface not up.\n", ndev->name);
0759         err = -ENETDOWN;
0760         goto rel_rt;
0761     }
0762 
0763     if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
0764         pr_info("multi-cast route %pI6 port %u, dev %s.\n",
0765             daddr6->sin6_addr.s6_addr,
0766             ntohs(daddr6->sin6_port), ndev->name);
0767         err = -ENETUNREACH;
0768         goto rel_rt;
0769     }
0770 
0771     cdev = cxgbi_device_find_by_netdev(ndev, &port);
0772     if (!cdev)
0773         cdev = cxgbi_device_find_by_mac(ndev, &port);
0774     if (!cdev) {
0775         pr_info("dst %pI6 %s, NOT cxgbi device.\n",
0776             daddr6->sin6_addr.s6_addr, ndev->name);
0777         err = -ENETUNREACH;
0778         goto rel_rt;
0779     }
0780     log_debug(1 << CXGBI_DBG_SOCK,
0781           "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
0782           daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
0783           ndev->name, cdev);
0784 
0785     csk = cxgbi_sock_create(cdev);
0786     if (!csk) {
0787         err = -ENOMEM;
0788         goto rel_rt;
0789     }
0790     csk->cdev = cdev;
0791     csk->port_id = port;
0792     csk->mtu = mtu;
0793     csk->dst = dst;
0794 
0795     rt6_get_prefsrc(rt, &pref_saddr);
0796     if (ipv6_addr_any(&pref_saddr)) {
0797         struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
0798 
0799         err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
0800                      &daddr6->sin6_addr, 0, &pref_saddr);
0801         if (err) {
0802             pr_info("failed to get source address to reach %pI6\n",
0803                 &daddr6->sin6_addr);
0804             goto rel_rt;
0805         }
0806     }
0807 
0808     csk->csk_family = AF_INET6;
0809     csk->daddr6.sin6_addr = daddr6->sin6_addr;
0810     csk->daddr6.sin6_port = daddr6->sin6_port;
0811     csk->daddr6.sin6_family = daddr6->sin6_family;
0812     csk->saddr6.sin6_family = daddr6->sin6_family;
0813     csk->saddr6.sin6_addr = pref_saddr;
0814 
0815     neigh_release(n);
0816     return csk;
0817 
0818 rel_rt:
0819     if (n)
0820         neigh_release(n);
0821 
0822     ip6_rt_put(rt);
0823     if (csk)
0824         cxgbi_sock_closed(csk);
0825 err_out:
0826     return ERR_PTR(err);
0827 }
0828 #endif /* IS_ENABLED(CONFIG_IPV6) */
0829 
0830 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
0831             unsigned int opt)
0832 {
0833     csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
0834     dst_confirm(csk->dst);
0835     smp_mb();
0836     cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
0837 }
0838 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
0839 
0840 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
0841 {
0842     log_debug(1 << CXGBI_DBG_SOCK,
0843         "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
0844         csk, csk->state, csk->flags, csk->user_data);
0845 
0846     if (csk->state != CTP_ESTABLISHED) {
0847         read_lock_bh(&csk->callback_lock);
0848         if (csk->user_data)
0849             iscsi_conn_failure(csk->user_data,
0850                     ISCSI_ERR_TCP_CONN_CLOSE);
0851         read_unlock_bh(&csk->callback_lock);
0852     }
0853 }
0854 
0855 void cxgbi_sock_closed(struct cxgbi_sock *csk)
0856 {
0857     log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
0858         csk, (csk)->state, (csk)->flags, (csk)->tid);
0859     cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
0860     if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
0861         return;
0862     if (csk->saddr.sin_port)
0863         sock_put_port(csk);
0864     if (csk->dst)
0865         dst_release(csk->dst);
0866     csk->cdev->csk_release_offload_resources(csk);
0867     cxgbi_sock_set_state(csk, CTP_CLOSED);
0868     cxgbi_inform_iscsi_conn_closing(csk);
0869     cxgbi_sock_put(csk);
0870 }
0871 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
0872 
0873 static void need_active_close(struct cxgbi_sock *csk)
0874 {
0875     int data_lost;
0876     int close_req = 0;
0877 
0878     log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
0879         csk, (csk)->state, (csk)->flags, (csk)->tid);
0880     spin_lock_bh(&csk->lock);
0881     if (csk->dst)
0882         dst_confirm(csk->dst);
0883     data_lost = skb_queue_len(&csk->receive_queue);
0884     __skb_queue_purge(&csk->receive_queue);
0885 
0886     if (csk->state == CTP_ACTIVE_OPEN)
0887         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
0888     else if (csk->state == CTP_ESTABLISHED) {
0889         close_req = 1;
0890         cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
0891     } else if (csk->state == CTP_PASSIVE_CLOSE) {
0892         close_req = 1;
0893         cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
0894     }
0895 
0896     if (close_req) {
0897         if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
0898             data_lost)
0899             csk->cdev->csk_send_abort_req(csk);
0900         else
0901             csk->cdev->csk_send_close_req(csk);
0902     }
0903 
0904     spin_unlock_bh(&csk->lock);
0905 }
0906 
0907 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
0908 {
0909     pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
0910             csk, csk->state, csk->flags,
0911             &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
0912             &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
0913             errno);
0914 
0915     cxgbi_sock_set_state(csk, CTP_CONNECTING);
0916     csk->err = errno;
0917     cxgbi_sock_closed(csk);
0918 }
0919 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
0920 
0921 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
0922 {
0923     struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
0924     struct module *owner = csk->cdev->owner;
0925 
0926     log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
0927         csk, (csk)->state, (csk)->flags, (csk)->tid);
0928     cxgbi_sock_get(csk);
0929     spin_lock_bh(&csk->lock);
0930     if (csk->state == CTP_ACTIVE_OPEN)
0931         cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
0932     spin_unlock_bh(&csk->lock);
0933     cxgbi_sock_put(csk);
0934     __kfree_skb(skb);
0935 
0936     module_put(owner);
0937 }
0938 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
0939 
0940 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
0941 {
0942     cxgbi_sock_get(csk);
0943     spin_lock_bh(&csk->lock);
0944 
0945     cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
0946     if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
0947         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
0948         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
0949             pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
0950                    csk, csk->state, csk->flags, csk->tid);
0951         cxgbi_sock_closed(csk);
0952     }
0953 
0954     spin_unlock_bh(&csk->lock);
0955     cxgbi_sock_put(csk);
0956 }
0957 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
0958 
0959 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
0960 {
0961     log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
0962         csk, (csk)->state, (csk)->flags, (csk)->tid);
0963     cxgbi_sock_get(csk);
0964     spin_lock_bh(&csk->lock);
0965 
0966     if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
0967         goto done;
0968 
0969     switch (csk->state) {
0970     case CTP_ESTABLISHED:
0971         cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
0972         break;
0973     case CTP_ACTIVE_CLOSE:
0974         cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
0975         break;
0976     case CTP_CLOSE_WAIT_1:
0977         cxgbi_sock_closed(csk);
0978         break;
0979     case CTP_ABORTING:
0980         break;
0981     default:
0982         pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
0983             csk, csk->state, csk->flags, csk->tid);
0984     }
0985     cxgbi_inform_iscsi_conn_closing(csk);
0986 done:
0987     spin_unlock_bh(&csk->lock);
0988     cxgbi_sock_put(csk);
0989 }
0990 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
0991 
0992 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
0993 {
0994     log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
0995         csk, (csk)->state, (csk)->flags, (csk)->tid);
0996     cxgbi_sock_get(csk);
0997     spin_lock_bh(&csk->lock);
0998 
0999     csk->snd_una = snd_nxt - 1;
1000     if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
1001         goto done;
1002 
1003     switch (csk->state) {
1004     case CTP_ACTIVE_CLOSE:
1005         cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1006         break;
1007     case CTP_CLOSE_WAIT_1:
1008     case CTP_CLOSE_WAIT_2:
1009         cxgbi_sock_closed(csk);
1010         break;
1011     case CTP_ABORTING:
1012         break;
1013     default:
1014         pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1015             csk, csk->state, csk->flags, csk->tid);
1016     }
1017 done:
1018     spin_unlock_bh(&csk->lock);
1019     cxgbi_sock_put(csk);
1020 }
1021 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1022 
1023 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1024                unsigned int snd_una, int seq_chk)
1025 {
1026     log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1027             "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1028             csk, csk->state, csk->flags, csk->tid, credits,
1029             csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1030 
1031     spin_lock_bh(&csk->lock);
1032 
1033     csk->wr_cred += credits;
1034     if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1035         csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1036 
1037     while (credits) {
1038         struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1039 
1040         if (unlikely(!p)) {
1041             pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1042                 csk, csk->state, csk->flags, csk->tid, credits,
1043                 csk->wr_cred, csk->wr_una_cred);
1044             break;
1045         }
1046 
1047         if (unlikely(credits < p->csum)) {
1048             pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1049                 csk, csk->state, csk->flags, csk->tid,
1050                 credits, csk->wr_cred, csk->wr_una_cred,
1051                 p->csum);
1052             p->csum -= credits;
1053             break;
1054         } else {
1055             cxgbi_sock_dequeue_wr(csk);
1056             credits -= p->csum;
1057             kfree_skb(p);
1058         }
1059     }
1060 
1061     cxgbi_sock_check_wr_invariants(csk);
1062 
1063     if (seq_chk) {
1064         if (unlikely(before(snd_una, csk->snd_una))) {
1065             pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1066                 csk, csk->state, csk->flags, csk->tid, snd_una,
1067                 csk->snd_una);
1068             goto done;
1069         }
1070 
1071         if (csk->snd_una != snd_una) {
1072             csk->snd_una = snd_una;
1073             dst_confirm(csk->dst);
1074         }
1075     }
1076 
1077     if (skb_queue_len(&csk->write_queue)) {
1078         if (csk->cdev->csk_push_tx_frames(csk, 0))
1079             cxgbi_conn_tx_open(csk);
1080     } else
1081         cxgbi_conn_tx_open(csk);
1082 done:
1083     spin_unlock_bh(&csk->lock);
1084 }
1085 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1086 
1087 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1088                          unsigned short mtu)
1089 {
1090     int i = 0;
1091 
1092     while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1093         ++i;
1094 
1095     return i;
1096 }
1097 
1098 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1099 {
1100     unsigned int idx;
1101     struct dst_entry *dst = csk->dst;
1102 
1103     csk->advmss = dst_metric_advmss(dst);
1104 
1105     if (csk->advmss > pmtu - 40)
1106         csk->advmss = pmtu - 40;
1107     if (csk->advmss < csk->cdev->mtus[0] - 40)
1108         csk->advmss = csk->cdev->mtus[0] - 40;
1109     idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1110 
1111     return idx;
1112 }
1113 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1114 
1115 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1116 {
1117     cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1118     __skb_queue_tail(&csk->write_queue, skb);
1119 }
1120 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1121 
1122 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1123 {
1124     struct sk_buff *skb;
1125 
1126     while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1127         kfree_skb(skb);
1128 }
1129 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1130 
1131 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1132 {
1133     int pending = cxgbi_sock_count_pending_wrs(csk);
1134 
1135     if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1136         pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1137             csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1138 }
1139 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1140 
1141 static inline void
1142 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1143         unsigned int *sgcnt, unsigned int *dlen,
1144         unsigned int prot)
1145 {
1146     struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
1147 
1148     *sgl = sdb->table.sgl;
1149     *sgcnt = sdb->table.nents;
1150     *dlen = sdb->length;
1151     /* Caution: for protection sdb, sdb->length is invalid */
1152 }
1153 
1154 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1155                 struct cxgbi_task_tag_info *ttinfo,
1156                 struct scatterlist **sg_pp, unsigned int *sg_off)
1157 {
1158     struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1159     unsigned int offset = sg_off ? *sg_off : 0;
1160     dma_addr_t addr = 0UL;
1161     unsigned int len = 0;
1162     int i;
1163 
1164     memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1165 
1166     if (sg) {
1167         addr = sg_dma_address(sg);
1168         len = sg_dma_len(sg);
1169     }
1170 
1171     for (i = 0; i < PPOD_PAGES_MAX; i++) {
1172         if (sg) {
1173             ppod->addr[i] = cpu_to_be64(addr + offset);
1174             offset += PAGE_SIZE;
1175             if (offset == (len + sg->offset)) {
1176                 offset = 0;
1177                 sg = sg_next(sg);
1178                 if (sg) {
1179                     addr = sg_dma_address(sg);
1180                     len = sg_dma_len(sg);
1181                 }
1182             }
1183         } else {
1184             ppod->addr[i] = 0ULL;
1185         }
1186     }
1187 
1188     /*
1189      * the fifth address needs to be repeated in the next ppod, so do
1190      * not move sg
1191      */
1192     if (sg_pp) {
1193         *sg_pp = sg;
1194         *sg_off = offset;
1195     }
1196 
1197     if (offset == len) {
1198         offset = 0;
1199         sg = sg_next(sg);
1200         if (sg) {
1201             addr = sg_dma_address(sg);
1202             len = sg_dma_len(sg);
1203         }
1204     }
1205     ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1206 }
1207 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1208 
1209 /*
1210  * APIs interacting with open-iscsi libraries
1211  */
1212 
1213 int cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1214             struct cxgbi_tag_format *tformat,
1215             unsigned int iscsi_size, unsigned int llimit,
1216             unsigned int start, unsigned int rsvd_factor,
1217             unsigned int edram_start, unsigned int edram_size)
1218 {
1219     int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1220                 cdev->lldev, tformat, iscsi_size, llimit, start,
1221                 rsvd_factor, edram_start, edram_size);
1222 
1223     if (err >= 0) {
1224         struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1225 
1226         if (ppm->ppmax < 1024 ||
1227             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1228             cdev->flags |= CXGBI_FLAG_DDP_OFF;
1229         err = 0;
1230     } else {
1231         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1232     }
1233 
1234     return err;
1235 }
1236 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1237 
1238 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1239 {
1240     int i;
1241     int last_sgidx = nents - 1;
1242     struct scatterlist *sg = sgl;
1243 
1244     for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1245         unsigned int len = sg->length + sg->offset;
1246 
1247         if ((sg->offset & 0x3) || (i && sg->offset) ||
1248             ((i != last_sgidx) && len != PAGE_SIZE)) {
1249             log_debug(1 << CXGBI_DBG_DDP,
1250                   "sg %u/%u, %u,%u, not aligned.\n",
1251                   i, nents, sg->offset, sg->length);
1252             goto err_out;
1253         }
1254     }
1255     return 0;
1256 err_out:
1257     return -EINVAL;
1258 }
1259 
1260 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1261                  struct cxgbi_task_data *tdata, u32 sw_tag,
1262                  unsigned int xferlen)
1263 {
1264     struct cxgbi_sock *csk = cconn->cep->csk;
1265     struct cxgbi_device *cdev = csk->cdev;
1266     struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1267     struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1268     struct scatterlist *sgl = ttinfo->sgl;
1269     unsigned int sgcnt = ttinfo->nents;
1270     unsigned int sg_offset = sgl->offset;
1271     int err;
1272 
1273     if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1274         log_debug(1 << CXGBI_DBG_DDP,
1275               "cdev 0x%p DDP off.\n", cdev);
1276         return -EINVAL;
1277     }
1278 
1279     if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1280         ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1281         log_debug(1 << CXGBI_DBG_DDP,
1282               "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1283               ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1284               xferlen, ttinfo->nents);
1285         return -EINVAL;
1286     }
1287 
1288     /* make sure the buffer is suitable for ddp */
1289     if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1290         return -EINVAL;
1291 
1292     ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1293                 PAGE_SHIFT;
1294 
1295     /*
1296      * the ddp tag will be used for the itt in the outgoing pdu,
1297      * the itt genrated by libiscsi is saved in the ppm and can be
1298      * retrieved via the ddp tag
1299      */
1300     err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1301                       &ttinfo->tag, (unsigned long)sw_tag);
1302     if (err < 0) {
1303         cconn->ddp_full++;
1304         return err;
1305     }
1306     ttinfo->npods = err;
1307 
1308      /* setup dma from scsi command sgl */
1309     sgl->offset = 0;
1310     err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1311     sgl->offset = sg_offset;
1312     if (err == 0) {
1313         pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1314             __func__, sw_tag, xferlen, sgcnt);
1315         goto rel_ppods;
1316     }
1317     if (err != ttinfo->nr_pages) {
1318         log_debug(1 << CXGBI_DBG_DDP,
1319               "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1320               __func__, sw_tag, xferlen, sgcnt, err);
1321     }
1322 
1323     ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1324     ttinfo->cid = csk->port_id;
1325 
1326     cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1327                 xferlen, &ttinfo->hdr);
1328 
1329     if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1330         /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1331         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1332     } else {
1333         /* write ppod from control queue now */
1334         err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1335         if (err < 0)
1336             goto rel_ppods;
1337     }
1338 
1339     return 0;
1340 
1341 rel_ppods:
1342     cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1343 
1344     if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1345         ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1346         dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1347     }
1348     return -EINVAL;
1349 }
1350 
1351 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1352 {
1353     struct scsi_cmnd *sc = task->sc;
1354     struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1355     struct cxgbi_conn *cconn = tcp_conn->dd_data;
1356     struct cxgbi_device *cdev = cconn->chba->cdev;
1357     struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1358     u32 tag = ntohl((__force u32)hdr_itt);
1359 
1360     log_debug(1 << CXGBI_DBG_DDP,
1361           "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1362           cdev, task, tag);
1363     if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
1364         cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1365         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1366         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1367 
1368         if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1369             cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1370         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1371         dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1372                  DMA_FROM_DEVICE);
1373     }
1374 }
1375 
1376 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1377 {
1378     /* assume idx and age both are < 0x7FFF (32767) */
1379     return (idx << 16) | age;
1380 }
1381 
1382 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1383 {
1384     struct scsi_cmnd *sc = task->sc;
1385     struct iscsi_conn *conn = task->conn;
1386     struct iscsi_session *sess = conn->session;
1387     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1388     struct cxgbi_conn *cconn = tcp_conn->dd_data;
1389     struct cxgbi_device *cdev = cconn->chba->cdev;
1390     struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1391     u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1392     u32 tag = 0;
1393     int err = -EINVAL;
1394 
1395     if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
1396         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1397         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1398 
1399         scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1400                 &tdata->dlen, 0);
1401         err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1402         if (!err)
1403             tag = ttinfo->tag;
1404         else
1405              log_debug(1 << CXGBI_DBG_DDP,
1406                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1407                    cconn->cep->csk, task, tdata->dlen,
1408                    ttinfo->nents);
1409     }
1410 
1411     if (err < 0) {
1412         err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1413         if (err < 0)
1414             return err;
1415     }
1416     /*  the itt need to sent in big-endian order */
1417     *hdr_itt = (__force itt_t)htonl(tag);
1418 
1419     log_debug(1 << CXGBI_DBG_DDP,
1420           "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1421           cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1422     return 0;
1423 }
1424 
1425 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1426 {
1427     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1428     struct cxgbi_conn *cconn = tcp_conn->dd_data;
1429     struct cxgbi_device *cdev = cconn->chba->cdev;
1430     struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1431     u32 tag = ntohl((__force u32)itt);
1432     u32 sw_bits;
1433 
1434     if (ppm) {
1435         if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1436             sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1437         else
1438             sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1439     } else {
1440         sw_bits = tag;
1441     }
1442 
1443     cxgbi_decode_sw_tag(sw_bits, idx, age);
1444     log_debug(1 << CXGBI_DBG_DDP,
1445           "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1446           cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1447           age ? *age : 0xFF);
1448 }
1449 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1450 
1451 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1452 {
1453     struct iscsi_conn *conn = csk->user_data;
1454 
1455     if (conn) {
1456         log_debug(1 << CXGBI_DBG_SOCK,
1457             "csk 0x%p, cid %d.\n", csk, conn->id);
1458         iscsi_conn_queue_xmit(conn);
1459     }
1460 }
1461 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1462 
1463 /*
1464  * pdu receive, interact with libiscsi_tcp
1465  */
1466 static inline int read_pdu_skb(struct iscsi_conn *conn,
1467                    struct sk_buff *skb,
1468                    unsigned int offset,
1469                    int offloaded)
1470 {
1471     int status = 0;
1472     int bytes_read;
1473 
1474     bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1475     switch (status) {
1476     case ISCSI_TCP_CONN_ERR:
1477         pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1478               skb, offset, offloaded);
1479         return -EIO;
1480     case ISCSI_TCP_SUSPENDED:
1481         log_debug(1 << CXGBI_DBG_PDU_RX,
1482             "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1483             skb, offset, offloaded, bytes_read);
1484         /* no transfer - just have caller flush queue */
1485         return bytes_read;
1486     case ISCSI_TCP_SKB_DONE:
1487         pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1488             skb, offset, offloaded);
1489         /*
1490          * pdus should always fit in the skb and we should get
1491          * segment done notifcation.
1492          */
1493         iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1494         return -EFAULT;
1495     case ISCSI_TCP_SEGMENT_DONE:
1496         log_debug(1 << CXGBI_DBG_PDU_RX,
1497             "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1498             skb, offset, offloaded, bytes_read);
1499         return bytes_read;
1500     default:
1501         pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1502             skb, offset, offloaded, status);
1503         return -EINVAL;
1504     }
1505 }
1506 
1507 static int
1508 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1509          struct sk_buff *skb)
1510 {
1511     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1512     int err;
1513 
1514     log_debug(1 << CXGBI_DBG_PDU_RX,
1515         "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1516         conn, skb, skb->len, cxgbi_skcb_flags(skb));
1517 
1518     if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1519         pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1520         iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1521         return -EIO;
1522     }
1523 
1524     if (conn->hdrdgst_en &&
1525         cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1526         pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1527         iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1528         return -EIO;
1529     }
1530 
1531     if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1532         cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1533         /* If completion flag is set and data is directly
1534          * placed in to the host memory then update
1535          * task->exp_datasn to the datasn in completion
1536          * iSCSI hdr as T6 adapter generates completion only
1537          * for the last pdu of a sequence.
1538          */
1539         itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1540         struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1541         u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1542                             skb->data)->datasn);
1543         if (task && task->sc) {
1544             struct iscsi_tcp_task *tcp_task = task->dd_data;
1545 
1546             tcp_task->exp_datasn = data_sn;
1547         }
1548     }
1549 
1550     err = read_pdu_skb(conn, skb, 0, 0);
1551     if (likely(err >= 0)) {
1552         struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1553         u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1554 
1555         if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1556             cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1557     }
1558 
1559     return err;
1560 }
1561 
1562 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1563                  struct sk_buff *skb, unsigned int offset)
1564 {
1565     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1566     bool offloaded = 0;
1567     int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1568 
1569     log_debug(1 << CXGBI_DBG_PDU_RX,
1570         "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1571         conn, skb, skb->len, cxgbi_skcb_flags(skb));
1572 
1573     if (conn->datadgst_en &&
1574         cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1575         pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1576             conn, lskb, cxgbi_skcb_flags(lskb));
1577         iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1578         return -EIO;
1579     }
1580 
1581     if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1582         return 0;
1583 
1584     /* coalesced, add header digest length */
1585     if (lskb == skb && conn->hdrdgst_en)
1586         offset += ISCSI_DIGEST_SIZE;
1587 
1588     if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1589         offloaded = 1;
1590 
1591     if (opcode == ISCSI_OP_SCSI_DATA_IN)
1592         log_debug(1 << CXGBI_DBG_PDU_RX,
1593             "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1594             skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1595             tcp_conn->in.datalen, offloaded ? "is" : "not");
1596 
1597     return read_pdu_skb(conn, skb, offset, offloaded);
1598 }
1599 
1600 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1601 {
1602     struct cxgbi_device *cdev = csk->cdev;
1603     int must_send;
1604     u32 credits;
1605 
1606     log_debug(1 << CXGBI_DBG_PDU_RX,
1607         "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1608         csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1609         csk->rcv_wup, cdev->rx_credit_thres,
1610         csk->rcv_win);
1611 
1612     if (!cdev->rx_credit_thres)
1613         return;
1614 
1615     if (csk->state != CTP_ESTABLISHED)
1616         return;
1617 
1618     credits = csk->copied_seq - csk->rcv_wup;
1619     if (unlikely(!credits))
1620         return;
1621     must_send = credits + 16384 >= csk->rcv_win;
1622     if (must_send || credits >= cdev->rx_credit_thres)
1623         csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1624 }
1625 
1626 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1627 {
1628     struct cxgbi_device *cdev = csk->cdev;
1629     struct iscsi_conn *conn = csk->user_data;
1630     struct sk_buff *skb;
1631     unsigned int read = 0;
1632     int err = 0;
1633 
1634     log_debug(1 << CXGBI_DBG_PDU_RX,
1635         "csk 0x%p, conn 0x%p.\n", csk, conn);
1636 
1637     if (unlikely(!conn || test_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags))) {
1638         log_debug(1 << CXGBI_DBG_PDU_RX,
1639             "csk 0x%p, conn 0x%p, id %d, conn flags 0x%lx!\n",
1640             csk, conn, conn ? conn->id : 0xFF,
1641             conn ? conn->flags : 0xFF);
1642         return;
1643     }
1644 
1645     while (!err) {
1646         skb = skb_peek(&csk->receive_queue);
1647         if (!skb ||
1648             !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1649             if (skb)
1650                 log_debug(1 << CXGBI_DBG_PDU_RX,
1651                     "skb 0x%p, NOT ready 0x%lx.\n",
1652                     skb, cxgbi_skcb_flags(skb));
1653             break;
1654         }
1655         __skb_unlink(skb, &csk->receive_queue);
1656 
1657         read += cxgbi_skcb_rx_pdulen(skb);
1658         log_debug(1 << CXGBI_DBG_PDU_RX,
1659             "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1660             csk, skb, skb->len, cxgbi_skcb_flags(skb),
1661             cxgbi_skcb_rx_pdulen(skb));
1662 
1663         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1664             err = skb_read_pdu_bhs(csk, conn, skb);
1665             if (err < 0) {
1666                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1667                     "f 0x%lx, plen %u.\n",
1668                     csk, skb, skb->len,
1669                     cxgbi_skcb_flags(skb),
1670                     cxgbi_skcb_rx_pdulen(skb));
1671                 goto skb_done;
1672             }
1673             err = skb_read_pdu_data(conn, skb, skb,
1674                         err + cdev->skb_rx_extra);
1675             if (err < 0)
1676                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1677                     "f 0x%lx, plen %u.\n",
1678                     csk, skb, skb->len,
1679                     cxgbi_skcb_flags(skb),
1680                     cxgbi_skcb_rx_pdulen(skb));
1681         } else {
1682             err = skb_read_pdu_bhs(csk, conn, skb);
1683             if (err < 0) {
1684                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1685                     "f 0x%lx, plen %u.\n",
1686                     csk, skb, skb->len,
1687                     cxgbi_skcb_flags(skb),
1688                     cxgbi_skcb_rx_pdulen(skb));
1689                 goto skb_done;
1690             }
1691 
1692             if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1693                 struct sk_buff *dskb;
1694 
1695                 dskb = skb_peek(&csk->receive_queue);
1696                 if (!dskb) {
1697                     pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1698                         " plen %u, NO data.\n",
1699                         csk, skb, skb->len,
1700                         cxgbi_skcb_flags(skb),
1701                         cxgbi_skcb_rx_pdulen(skb));
1702                     err = -EIO;
1703                     goto skb_done;
1704                 }
1705                 __skb_unlink(dskb, &csk->receive_queue);
1706 
1707                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1708                 if (err < 0)
1709                     pr_err("data, csk 0x%p, skb 0x%p,%u, "
1710                         "f 0x%lx, plen %u, dskb 0x%p,"
1711                         "%u.\n",
1712                         csk, skb, skb->len,
1713                         cxgbi_skcb_flags(skb),
1714                         cxgbi_skcb_rx_pdulen(skb),
1715                         dskb, dskb->len);
1716                 __kfree_skb(dskb);
1717             } else
1718                 err = skb_read_pdu_data(conn, skb, skb, 0);
1719         }
1720 skb_done:
1721         __kfree_skb(skb);
1722 
1723         if (err < 0)
1724             break;
1725     }
1726 
1727     log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1728     if (read) {
1729         csk->copied_seq += read;
1730         csk_return_rx_credits(csk, read);
1731         conn->rxdata_octets += read;
1732     }
1733 
1734     if (err < 0) {
1735         pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1736             csk, conn, err, read);
1737         iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1738     }
1739 }
1740 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1741 
1742 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1743                 unsigned int offset, unsigned int *off,
1744                 struct scatterlist **sgp)
1745 {
1746     int i;
1747     struct scatterlist *sg;
1748 
1749     for_each_sg(sgl, sg, sgcnt, i) {
1750         if (offset < sg->length) {
1751             *off = offset;
1752             *sgp = sg;
1753             return 0;
1754         }
1755         offset -= sg->length;
1756     }
1757     return -EFAULT;
1758 }
1759 
1760 static int
1761 sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1762           unsigned int dlen, struct page_frag *frags,
1763           int frag_max, u32 *dlimit)
1764 {
1765     unsigned int datalen = dlen;
1766     unsigned int sglen = sg->length - sgoffset;
1767     struct page *page = sg_page(sg);
1768     int i;
1769 
1770     i = 0;
1771     do {
1772         unsigned int copy;
1773 
1774         if (!sglen) {
1775             sg = sg_next(sg);
1776             if (!sg) {
1777                 pr_warn("sg %d NULL, len %u/%u.\n",
1778                     i, datalen, dlen);
1779                 return -EINVAL;
1780             }
1781             sgoffset = 0;
1782             sglen = sg->length;
1783             page = sg_page(sg);
1784 
1785         }
1786         copy = min(datalen, sglen);
1787         if (i && page == frags[i - 1].page &&
1788             sgoffset + sg->offset ==
1789             frags[i - 1].offset + frags[i - 1].size) {
1790             frags[i - 1].size += copy;
1791         } else {
1792             if (i >= frag_max) {
1793                 pr_warn("too many pages %u, dlen %u.\n",
1794                     frag_max, dlen);
1795                 *dlimit = dlen - datalen;
1796                 return -EINVAL;
1797             }
1798 
1799             frags[i].page = page;
1800             frags[i].offset = sg->offset + sgoffset;
1801             frags[i].size = copy;
1802             i++;
1803         }
1804         datalen -= copy;
1805         sgoffset += copy;
1806         sglen -= copy;
1807     } while (datalen);
1808 
1809     return i;
1810 }
1811 
1812 static void cxgbi_task_data_sgl_check(struct iscsi_task *task)
1813 {
1814     struct scsi_cmnd *sc = task->sc;
1815     struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1816     struct scatterlist *sg, *sgl = NULL;
1817     u32 sgcnt = 0;
1818     int i;
1819 
1820     tdata->flags = CXGBI_TASK_SGL_CHECKED;
1821     if (!sc)
1822         return;
1823 
1824     scmd_get_params(sc, &sgl, &sgcnt, &tdata->dlen, 0);
1825     if (!sgl || !sgcnt) {
1826         tdata->flags |= CXGBI_TASK_SGL_COPY;
1827         return;
1828     }
1829 
1830     for_each_sg(sgl, sg, sgcnt, i) {
1831         if (page_count(sg_page(sg)) < 1) {
1832             tdata->flags |= CXGBI_TASK_SGL_COPY;
1833             return;
1834         }
1835     }
1836 }
1837 
1838 static int
1839 cxgbi_task_data_sgl_read(struct iscsi_task *task, u32 offset, u32 count,
1840              u32 *dlimit)
1841 {
1842     struct scsi_cmnd *sc = task->sc;
1843     struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1844     struct scatterlist *sgl = NULL;
1845     struct scatterlist *sg;
1846     u32 dlen = 0;
1847     u32 sgcnt;
1848     int err;
1849 
1850     if (!sc)
1851         return 0;
1852 
1853     scmd_get_params(sc, &sgl, &sgcnt, &dlen, 0);
1854     if (!sgl || !sgcnt)
1855         return 0;
1856 
1857     err = sgl_seek_offset(sgl, sgcnt, offset, &tdata->sgoffset, &sg);
1858     if (err < 0) {
1859         pr_warn("tpdu max, sgl %u, bad offset %u/%u.\n",
1860             sgcnt, offset, tdata->dlen);
1861         return err;
1862     }
1863     err = sgl_read_to_frags(sg, tdata->sgoffset, count,
1864                 tdata->frags, MAX_SKB_FRAGS, dlimit);
1865     if (err < 0) {
1866         log_debug(1 << CXGBI_DBG_ISCSI,
1867               "sgl max limit, sgl %u, offset %u, %u/%u, dlimit %u.\n",
1868               sgcnt, offset, count, tdata->dlen, *dlimit);
1869         return err;
1870     }
1871     tdata->offset = offset;
1872     tdata->count = count;
1873     tdata->nr_frags = err;
1874     tdata->total_count = count;
1875     tdata->total_offset = offset;
1876 
1877     log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1878           "%s: offset %u, count %u,\n"
1879           "err %u, total_count %u, total_offset %u\n",
1880           __func__, offset, count, err,  tdata->total_count, tdata->total_offset);
1881 
1882     return 0;
1883 }
1884 
1885 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 op)
1886 {
1887     struct iscsi_conn *conn = task->conn;
1888     struct iscsi_session *session = task->conn->session;
1889     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1890     struct cxgbi_conn *cconn = tcp_conn->dd_data;
1891     struct cxgbi_device *cdev = cconn->chba->cdev;
1892     struct cxgbi_sock *csk = cconn->cep ? cconn->cep->csk : NULL;
1893     struct iscsi_tcp_task *tcp_task = task->dd_data;
1894     struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1895     struct scsi_cmnd *sc = task->sc;
1896     u32 headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1897     u32 max_txdata_len = conn->max_xmit_dlength;
1898     u32 iso_tx_rsvd = 0, local_iso_info = 0;
1899     u32 last_tdata_offset, last_tdata_count;
1900     int err = 0;
1901 
1902     if (!tcp_task) {
1903         pr_err("task 0x%p, tcp_task 0x%p, tdata 0x%p.\n",
1904                task, tcp_task, tdata);
1905         return -ENOMEM;
1906     }
1907     if (!csk) {
1908         pr_err("task 0x%p, csk gone.\n", task);
1909         return -EPIPE;
1910     }
1911 
1912     op &= ISCSI_OPCODE_MASK;
1913 
1914     tcp_task->dd_data = tdata;
1915     task->hdr = NULL;
1916 
1917     last_tdata_count = tdata->count;
1918     last_tdata_offset = tdata->offset;
1919 
1920     if ((op == ISCSI_OP_SCSI_DATA_OUT) ||
1921         ((op == ISCSI_OP_SCSI_CMD) &&
1922          (sc->sc_data_direction == DMA_TO_DEVICE))) {
1923         u32 remaining_data_tosend, dlimit = 0;
1924         u32 max_pdu_size, max_num_pdu, num_pdu;
1925         u32 count;
1926 
1927         /* Preserve conn->max_xmit_dlength because it can get updated to
1928          * ISO data size.
1929          */
1930         if (task->state == ISCSI_TASK_PENDING)
1931             tdata->max_xmit_dlength = conn->max_xmit_dlength;
1932 
1933         if (!tdata->offset)
1934             cxgbi_task_data_sgl_check(task);
1935 
1936         remaining_data_tosend =
1937             tdata->dlen - tdata->offset - tdata->count;
1938 
1939 recalculate_sgl:
1940         max_txdata_len = tdata->max_xmit_dlength;
1941         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1942               "tdata->dlen %u, remaining to send %u "
1943               "conn->max_xmit_dlength %u, "
1944               "tdata->max_xmit_dlength %u\n",
1945               tdata->dlen, remaining_data_tosend,
1946               conn->max_xmit_dlength, tdata->max_xmit_dlength);
1947 
1948         if (cdev->skb_iso_txhdr && !csk->disable_iso &&
1949             (remaining_data_tosend > tdata->max_xmit_dlength) &&
1950             !(remaining_data_tosend % 4)) {
1951             u32 max_iso_data;
1952 
1953             if ((op == ISCSI_OP_SCSI_CMD) &&
1954                 session->initial_r2t_en)
1955                 goto no_iso;
1956 
1957             max_pdu_size = tdata->max_xmit_dlength +
1958                        ISCSI_PDU_NONPAYLOAD_LEN;
1959             max_iso_data = rounddown(CXGBI_MAX_ISO_DATA_IN_SKB,
1960                          csk->advmss);
1961             max_num_pdu = max_iso_data / max_pdu_size;
1962 
1963             num_pdu = (remaining_data_tosend +
1964                    tdata->max_xmit_dlength - 1) /
1965                   tdata->max_xmit_dlength;
1966 
1967             if (num_pdu > max_num_pdu)
1968                 num_pdu = max_num_pdu;
1969 
1970             conn->max_xmit_dlength = tdata->max_xmit_dlength * num_pdu;
1971             max_txdata_len = conn->max_xmit_dlength;
1972             iso_tx_rsvd = cdev->skb_iso_txhdr;
1973             local_iso_info = sizeof(struct cxgbi_iso_info);
1974 
1975             log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1976                   "max_pdu_size %u, max_num_pdu %u, "
1977                   "max_txdata %u, num_pdu %u\n",
1978                   max_pdu_size, max_num_pdu,
1979                   max_txdata_len, num_pdu);
1980         }
1981 no_iso:
1982         count  = min_t(u32, max_txdata_len, remaining_data_tosend);
1983         err = cxgbi_task_data_sgl_read(task,
1984                            tdata->offset + tdata->count,
1985                            count, &dlimit);
1986         if (unlikely(err < 0)) {
1987             log_debug(1 << CXGBI_DBG_ISCSI,
1988                   "task 0x%p, tcp_task 0x%p, tdata 0x%p, "
1989                   "sgl err %d, count %u, dlimit %u\n",
1990                   task, tcp_task, tdata, err, count, dlimit);
1991             if (dlimit) {
1992                 remaining_data_tosend =
1993                     rounddown(dlimit,
1994                           tdata->max_xmit_dlength);
1995                 if (!remaining_data_tosend)
1996                     remaining_data_tosend = dlimit;
1997 
1998                 dlimit = 0;
1999 
2000                 conn->max_xmit_dlength = remaining_data_tosend;
2001                 goto recalculate_sgl;
2002             }
2003 
2004             pr_err("task 0x%p, tcp_task 0x%p, tdata 0x%p, "
2005                 "sgl err %d\n",
2006                 task, tcp_task, tdata, err);
2007             goto ret_err;
2008         }
2009 
2010         if ((tdata->flags & CXGBI_TASK_SGL_COPY) ||
2011             (tdata->nr_frags > MAX_SKB_FRAGS))
2012             headroom += conn->max_xmit_dlength;
2013     }
2014 
2015     tdata->skb = alloc_skb(local_iso_info + cdev->skb_tx_rsvd +
2016                    iso_tx_rsvd + headroom, GFP_ATOMIC);
2017     if (!tdata->skb) {
2018         tdata->count = last_tdata_count;
2019         tdata->offset = last_tdata_offset;
2020         err = -ENOMEM;
2021         goto ret_err;
2022     }
2023 
2024     skb_reserve(tdata->skb, local_iso_info + cdev->skb_tx_rsvd +
2025             iso_tx_rsvd);
2026 
2027     if (task->sc) {
2028         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2029     } else {
2030         task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
2031         if (!task->hdr) {
2032             __kfree_skb(tdata->skb);
2033             tdata->skb = NULL;
2034             return -ENOMEM;
2035         }
2036     }
2037 
2038     task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX;
2039 
2040     if (iso_tx_rsvd)
2041         cxgbi_skcb_set_flag(tdata->skb, SKCBF_TX_ISO);
2042 
2043     /* data_out uses scsi_cmd's itt */
2044     if (op != ISCSI_OP_SCSI_DATA_OUT)
2045         task_reserve_itt(task, &task->hdr->itt);
2046 
2047     log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2048           "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2049           task, op, tdata->skb, cdev->skb_tx_rsvd, headroom,
2050           conn->max_xmit_dlength, be32_to_cpu(task->hdr->itt));
2051 
2052     return 0;
2053 
2054 ret_err:
2055     conn->max_xmit_dlength = tdata->max_xmit_dlength;
2056     return err;
2057 }
2058 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2059 
2060 static int
2061 cxgbi_prep_iso_info(struct iscsi_task *task, struct sk_buff *skb,
2062             u32 count)
2063 {
2064     struct cxgbi_iso_info *iso_info = (struct cxgbi_iso_info *)skb->head;
2065     struct iscsi_r2t_info *r2t;
2066     struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2067     struct iscsi_conn *conn = task->conn;
2068     struct iscsi_session *session = conn->session;
2069     struct iscsi_tcp_task *tcp_task = task->dd_data;
2070     u32 burst_size = 0, r2t_dlength = 0, dlength;
2071     u32 max_pdu_len = tdata->max_xmit_dlength;
2072     u32 segment_offset = 0;
2073     u32 num_pdu;
2074 
2075     if (unlikely(!cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO)))
2076         return 0;
2077 
2078     memset(iso_info, 0, sizeof(struct cxgbi_iso_info));
2079 
2080     if (task->hdr->opcode == ISCSI_OP_SCSI_CMD && session->imm_data_en) {
2081         iso_info->flags |= CXGBI_ISO_INFO_IMM_ENABLE;
2082         burst_size = count;
2083     }
2084 
2085     dlength = ntoh24(task->hdr->dlength);
2086     dlength = min(dlength, max_pdu_len);
2087     hton24(task->hdr->dlength, dlength);
2088 
2089     num_pdu = (count + max_pdu_len - 1) / max_pdu_len;
2090 
2091     if (iscsi_task_has_unsol_data(task))
2092         r2t = &task->unsol_r2t;
2093     else
2094         r2t = tcp_task->r2t;
2095 
2096     if (r2t) {
2097         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2098               "count %u, tdata->count %u, num_pdu %u,"
2099               "task->hdr_len %u, r2t->data_length %u, r2t->sent %u\n",
2100               count, tdata->count, num_pdu, task->hdr_len,
2101               r2t->data_length, r2t->sent);
2102 
2103         r2t_dlength = r2t->data_length - r2t->sent;
2104         segment_offset = r2t->sent;
2105         r2t->datasn += num_pdu - 1;
2106     }
2107 
2108     if (!r2t || !r2t->sent)
2109         iso_info->flags |= CXGBI_ISO_INFO_FSLICE;
2110 
2111     if (task->hdr->flags & ISCSI_FLAG_CMD_FINAL)
2112         iso_info->flags |= CXGBI_ISO_INFO_LSLICE;
2113 
2114     task->hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2115 
2116     iso_info->op = task->hdr->opcode;
2117     iso_info->ahs = task->hdr->hlength;
2118     iso_info->num_pdu = num_pdu;
2119     iso_info->mpdu = max_pdu_len;
2120     iso_info->burst_size = (burst_size + r2t_dlength) >> 2;
2121     iso_info->len = count + task->hdr_len;
2122     iso_info->segment_offset = segment_offset;
2123 
2124     cxgbi_skcb_tx_iscsi_hdrlen(skb) = task->hdr_len;
2125     return 0;
2126 }
2127 
2128 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2129 {
2130     if (hcrc || dcrc) {
2131         u8 submode = 0;
2132 
2133         if (hcrc)
2134             submode |= 1;
2135         if (dcrc)
2136             submode |= 2;
2137         cxgbi_skcb_tx_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2138     } else
2139         cxgbi_skcb_tx_ulp_mode(skb) = 0;
2140 }
2141 
2142 static struct page *rsvd_page;
2143 
2144 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2145                   unsigned int count)
2146 {
2147     struct iscsi_conn *conn = task->conn;
2148     struct iscsi_tcp_task *tcp_task = task->dd_data;
2149     struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2150     struct sk_buff *skb;
2151     struct scsi_cmnd *sc = task->sc;
2152     u32 expected_count, expected_offset;
2153     u32 datalen = count, dlimit = 0;
2154     u32 i, padlen = iscsi_padding(count);
2155     struct page *pg;
2156     int err;
2157 
2158     if (!tcp_task || (tcp_task->dd_data != tdata)) {
2159         pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2160                task, task->sc, tcp_task,
2161                tcp_task ? tcp_task->dd_data : NULL, tdata);
2162         return -EINVAL;
2163     }
2164     skb = tdata->skb;
2165 
2166     log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2167           "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2168           task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2169           be32_to_cpu(task->cmdsn), be32_to_cpu(task->hdr->itt), offset, count);
2170 
2171     skb_put(skb, task->hdr_len);
2172     tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2173     if (!count) {
2174         tdata->count = count;
2175         tdata->offset = offset;
2176         tdata->nr_frags = 0;
2177         tdata->total_offset = 0;
2178         tdata->total_count = 0;
2179         if (tdata->max_xmit_dlength)
2180             conn->max_xmit_dlength = tdata->max_xmit_dlength;
2181         cxgbi_skcb_clear_flag(skb, SKCBF_TX_ISO);
2182         return 0;
2183     }
2184 
2185     log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2186           "data->total_count %u, tdata->total_offset %u\n",
2187           tdata->total_count, tdata->total_offset);
2188 
2189     expected_count = tdata->total_count;
2190     expected_offset = tdata->total_offset;
2191 
2192     if ((count != expected_count) ||
2193         (offset != expected_offset)) {
2194         err = cxgbi_task_data_sgl_read(task, offset, count, &dlimit);
2195         if (err < 0) {
2196             pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p "
2197                    "dlimit %u, sgl err %d.\n", task, task->sc,
2198                    tcp_task, tcp_task ? tcp_task->dd_data : NULL,
2199                    tdata, dlimit, err);
2200             return err;
2201         }
2202     }
2203 
2204     /* Restore original value of conn->max_xmit_dlength because
2205      * it can get updated to ISO data size.
2206      */
2207     conn->max_xmit_dlength = tdata->max_xmit_dlength;
2208 
2209     if (sc) {
2210         struct page_frag *frag = tdata->frags;
2211 
2212         if ((tdata->flags & CXGBI_TASK_SGL_COPY) ||
2213             (tdata->nr_frags > MAX_SKB_FRAGS) ||
2214             (padlen && (tdata->nr_frags ==
2215                     MAX_SKB_FRAGS))) {
2216             char *dst = skb->data + task->hdr_len;
2217 
2218             /* data fits in the skb's headroom */
2219             for (i = 0; i < tdata->nr_frags; i++, frag++) {
2220                 char *src = kmap_atomic(frag->page);
2221 
2222                 memcpy(dst, src + frag->offset, frag->size);
2223                 dst += frag->size;
2224                 kunmap_atomic(src);
2225             }
2226 
2227             if (padlen) {
2228                 memset(dst, 0, padlen);
2229                 padlen = 0;
2230             }
2231             skb_put(skb, count + padlen);
2232         } else {
2233             for (i = 0; i < tdata->nr_frags; i++, frag++) {
2234                 get_page(frag->page);
2235                 skb_fill_page_desc(skb, i, frag->page,
2236                            frag->offset, frag->size);
2237             }
2238 
2239             skb->len += count;
2240             skb->data_len += count;
2241             skb->truesize += count;
2242         }
2243     } else {
2244         pg = virt_to_head_page(task->data);
2245         get_page(pg);
2246         skb_fill_page_desc(skb, 0, pg,
2247                    task->data - (char *)page_address(pg),
2248                    count);
2249         skb->len += count;
2250         skb->data_len += count;
2251         skb->truesize += count;
2252     }
2253 
2254     if (padlen) {
2255         get_page(rsvd_page);
2256         skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2257                    rsvd_page, 0, padlen);
2258 
2259         skb->data_len += padlen;
2260         skb->truesize += padlen;
2261         skb->len += padlen;
2262     }
2263 
2264     if (likely(count > tdata->max_xmit_dlength))
2265         cxgbi_prep_iso_info(task, skb, count);
2266     else
2267         cxgbi_skcb_clear_flag(skb, SKCBF_TX_ISO);
2268 
2269     return 0;
2270 }
2271 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2272 
2273 static int cxgbi_sock_tx_queue_up(struct cxgbi_sock *csk, struct sk_buff *skb)
2274 {
2275     struct cxgbi_device *cdev = csk->cdev;
2276     struct cxgbi_iso_info *iso_cpl;
2277     u32 frags = skb_shinfo(skb)->nr_frags;
2278     u32 extra_len, num_pdu, hdr_len;
2279     u32 iso_tx_rsvd = 0;
2280 
2281     if (csk->state != CTP_ESTABLISHED) {
2282         log_debug(1 << CXGBI_DBG_PDU_TX,
2283               "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
2284               csk, csk->state, csk->flags, csk->tid);
2285         return -EPIPE;
2286     }
2287 
2288     if (csk->err) {
2289         log_debug(1 << CXGBI_DBG_PDU_TX,
2290               "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
2291               csk, csk->state, csk->flags, csk->tid, csk->err);
2292         return -EPIPE;
2293     }
2294 
2295     if ((cdev->flags & CXGBI_FLAG_DEV_T3) &&
2296         before((csk->snd_win + csk->snd_una), csk->write_seq)) {
2297         log_debug(1 << CXGBI_DBG_PDU_TX,
2298               "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
2299               csk, csk->state, csk->flags, csk->tid, csk->write_seq,
2300               csk->snd_una, csk->snd_win);
2301         return -ENOBUFS;
2302     }
2303 
2304     if (cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO))
2305         iso_tx_rsvd = cdev->skb_iso_txhdr;
2306 
2307     if (unlikely(skb_headroom(skb) < (cdev->skb_tx_rsvd + iso_tx_rsvd))) {
2308         pr_err("csk 0x%p, skb head %u < %u.\n",
2309                csk, skb_headroom(skb), cdev->skb_tx_rsvd);
2310         return -EINVAL;
2311     }
2312 
2313     if (skb->len != skb->data_len)
2314         frags++;
2315 
2316     if (frags >= SKB_WR_LIST_SIZE) {
2317         pr_err("csk 0x%p, frags %u, %u,%u >%lu.\n",
2318                csk, skb_shinfo(skb)->nr_frags, skb->len,
2319                skb->data_len, SKB_WR_LIST_SIZE);
2320         return -EINVAL;
2321     }
2322 
2323     cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
2324     skb_reset_transport_header(skb);
2325     cxgbi_sock_skb_entail(csk, skb);
2326 
2327     extra_len = cxgbi_ulp_extra_len(cxgbi_skcb_tx_ulp_mode(skb));
2328 
2329     if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO))) {
2330         iso_cpl = (struct cxgbi_iso_info *)skb->head;
2331         num_pdu = iso_cpl->num_pdu;
2332         hdr_len = cxgbi_skcb_tx_iscsi_hdrlen(skb);
2333         extra_len = (cxgbi_ulp_extra_len(cxgbi_skcb_tx_ulp_mode(skb)) *
2334                  num_pdu) + (hdr_len * (num_pdu - 1));
2335     }
2336 
2337     csk->write_seq += (skb->len + extra_len);
2338 
2339     return 0;
2340 }
2341 
2342 static int cxgbi_sock_send_skb(struct cxgbi_sock *csk, struct sk_buff *skb)
2343 {
2344     struct cxgbi_device *cdev = csk->cdev;
2345     int len = skb->len;
2346     int err;
2347 
2348     spin_lock_bh(&csk->lock);
2349     err = cxgbi_sock_tx_queue_up(csk, skb);
2350     if (err < 0) {
2351         spin_unlock_bh(&csk->lock);
2352         return err;
2353     }
2354 
2355     if (likely(skb_queue_len(&csk->write_queue)))
2356         cdev->csk_push_tx_frames(csk, 0);
2357     spin_unlock_bh(&csk->lock);
2358     return len;
2359 }
2360 
2361 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2362 {
2363     struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2364     struct cxgbi_conn *cconn = tcp_conn->dd_data;
2365     struct iscsi_tcp_task *tcp_task = task->dd_data;
2366     struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2367     struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2368     struct sk_buff *skb;
2369     struct cxgbi_sock *csk = NULL;
2370     u32 pdulen = 0;
2371     u32 datalen;
2372     int err;
2373 
2374     if (!tcp_task || (tcp_task->dd_data != tdata)) {
2375         pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2376                task, task->sc, tcp_task,
2377                tcp_task ? tcp_task->dd_data : NULL, tdata);
2378         return -EINVAL;
2379     }
2380 
2381     skb = tdata->skb;
2382     if (!skb) {
2383         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2384               "task 0x%p, skb NULL.\n", task);
2385         return 0;
2386     }
2387 
2388     if (cconn && cconn->cep)
2389         csk = cconn->cep->csk;
2390 
2391     if (!csk) {
2392         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2393               "task 0x%p, csk gone.\n", task);
2394         return -EPIPE;
2395     }
2396 
2397     tdata->skb = NULL;
2398     datalen = skb->data_len;
2399 
2400     /* write ppod first if using ofldq to write ppod */
2401     if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2402         struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2403 
2404         ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2405         if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2406             pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2407                    task);
2408             /* continue. Let fl get the data */
2409     }
2410 
2411     if (!task->sc)
2412         memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2413 
2414     err = cxgbi_sock_send_skb(csk, skb);
2415     if (err > 0) {
2416         pdulen += err;
2417 
2418         log_debug(1 << CXGBI_DBG_PDU_TX, "task 0x%p,0x%p, rv %d.\n",
2419               task, task->sc, err);
2420 
2421         if (task->conn->hdrdgst_en)
2422             pdulen += ISCSI_DIGEST_SIZE;
2423 
2424         if (datalen && task->conn->datadgst_en)
2425             pdulen += ISCSI_DIGEST_SIZE;
2426 
2427         task->conn->txdata_octets += pdulen;
2428 
2429         if (unlikely(cxgbi_is_iso_config(csk) && cxgbi_is_iso_disabled(csk))) {
2430             if (time_after(jiffies, csk->prev_iso_ts + HZ)) {
2431                 csk->disable_iso = false;
2432                 csk->prev_iso_ts = 0;
2433                 log_debug(1 << CXGBI_DBG_PDU_TX,
2434                       "enable iso: csk 0x%p\n", csk);
2435             }
2436         }
2437 
2438         return 0;
2439     }
2440 
2441     if (err == -EAGAIN || err == -ENOBUFS) {
2442         log_debug(1 << CXGBI_DBG_PDU_TX,
2443               "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2444               task, skb, skb->len, skb->data_len, err);
2445         /* reset skb to send when we are called again */
2446         tdata->skb = skb;
2447 
2448         if (cxgbi_is_iso_config(csk) && !cxgbi_is_iso_disabled(csk) &&
2449             (csk->no_tx_credits++ >= 2)) {
2450             csk->disable_iso = true;
2451             csk->prev_iso_ts = jiffies;
2452             log_debug(1 << CXGBI_DBG_PDU_TX,
2453                   "disable iso:csk 0x%p, ts:%lu\n",
2454                   csk, csk->prev_iso_ts);
2455         }
2456 
2457         return err;
2458     }
2459 
2460     log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2461           "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2462           task->itt, skb, skb->len, skb->data_len, err);
2463     __kfree_skb(skb);
2464     iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2465     iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2466     return err;
2467 }
2468 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2469 
2470 void cxgbi_cleanup_task(struct iscsi_task *task)
2471 {
2472     struct iscsi_tcp_task *tcp_task = task->dd_data;
2473     struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2474 
2475     if (!tcp_task || (tcp_task->dd_data != tdata)) {
2476         pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2477             task, task->sc, tcp_task,
2478             tcp_task ? tcp_task->dd_data : NULL, tdata);
2479         return;
2480     }
2481 
2482     log_debug(1 << CXGBI_DBG_ISCSI,
2483         "task 0x%p, skb 0x%p, itt 0x%x.\n",
2484         task, tdata->skb, task->hdr_itt);
2485 
2486     tcp_task->dd_data = NULL;
2487 
2488     if (!task->sc)
2489         kfree(task->hdr);
2490     task->hdr = NULL;
2491 
2492     /*  never reached the xmit task callout */
2493     if (tdata->skb) {
2494         __kfree_skb(tdata->skb);
2495         tdata->skb = NULL;
2496     }
2497 
2498     task_release_itt(task, task->hdr_itt);
2499     memset(tdata, 0, sizeof(*tdata));
2500 
2501     iscsi_tcp_cleanup_task(task);
2502 }
2503 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2504 
2505 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2506                 struct iscsi_stats *stats)
2507 {
2508     struct iscsi_conn *conn = cls_conn->dd_data;
2509 
2510     stats->txdata_octets = conn->txdata_octets;
2511     stats->rxdata_octets = conn->rxdata_octets;
2512     stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2513     stats->dataout_pdus = conn->dataout_pdus_cnt;
2514     stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2515     stats->datain_pdus = conn->datain_pdus_cnt;
2516     stats->r2t_pdus = conn->r2t_pdus_cnt;
2517     stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2518     stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2519     stats->digest_err = 0;
2520     stats->timeout_err = 0;
2521     stats->custom_length = 1;
2522     strcpy(stats->custom[0].desc, "eh_abort_cnt");
2523     stats->custom[0].value = conn->eh_abort_cnt;
2524 }
2525 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2526 
2527 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2528 {
2529     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2530     struct cxgbi_conn *cconn = tcp_conn->dd_data;
2531     struct cxgbi_device *cdev = cconn->chba->cdev;
2532     unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2533     unsigned int max_def = 512 * MAX_SKB_FRAGS;
2534     unsigned int max = max(max_def, headroom);
2535 
2536     max = min(cconn->chba->cdev->tx_max_size, max);
2537     if (conn->max_xmit_dlength)
2538         conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2539     else
2540         conn->max_xmit_dlength = max;
2541     cxgbi_align_pdu_size(conn->max_xmit_dlength);
2542 
2543     return 0;
2544 }
2545 
2546 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2547 {
2548     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2549     struct cxgbi_conn *cconn = tcp_conn->dd_data;
2550     unsigned int max = cconn->chba->cdev->rx_max_size;
2551 
2552     cxgbi_align_pdu_size(max);
2553 
2554     if (conn->max_recv_dlength) {
2555         if (conn->max_recv_dlength > max) {
2556             pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2557                 conn->max_recv_dlength, max);
2558             return -EINVAL;
2559         }
2560         conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2561         cxgbi_align_pdu_size(conn->max_recv_dlength);
2562     } else
2563         conn->max_recv_dlength = max;
2564 
2565     return 0;
2566 }
2567 
2568 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2569             enum iscsi_param param, char *buf, int buflen)
2570 {
2571     struct iscsi_conn *conn = cls_conn->dd_data;
2572     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2573     struct cxgbi_conn *cconn = tcp_conn->dd_data;
2574     struct cxgbi_sock *csk = cconn->cep->csk;
2575     int err;
2576 
2577     log_debug(1 << CXGBI_DBG_ISCSI,
2578         "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2579         cls_conn, param, buflen, buf);
2580 
2581     switch (param) {
2582     case ISCSI_PARAM_HDRDGST_EN:
2583         err = iscsi_set_param(cls_conn, param, buf, buflen);
2584         if (!err && conn->hdrdgst_en)
2585             err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2586                             conn->hdrdgst_en,
2587                             conn->datadgst_en);
2588         break;
2589     case ISCSI_PARAM_DATADGST_EN:
2590         err = iscsi_set_param(cls_conn, param, buf, buflen);
2591         if (!err && conn->datadgst_en)
2592             err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2593                             conn->hdrdgst_en,
2594                             conn->datadgst_en);
2595         break;
2596     case ISCSI_PARAM_MAX_R2T:
2597         return iscsi_tcp_set_max_r2t(conn, buf);
2598     case ISCSI_PARAM_MAX_RECV_DLENGTH:
2599         err = iscsi_set_param(cls_conn, param, buf, buflen);
2600         if (!err)
2601             err = cxgbi_conn_max_recv_dlength(conn);
2602         break;
2603     case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2604         err = iscsi_set_param(cls_conn, param, buf, buflen);
2605         if (!err)
2606             err = cxgbi_conn_max_xmit_dlength(conn);
2607         break;
2608     default:
2609         return iscsi_set_param(cls_conn, param, buf, buflen);
2610     }
2611     return err;
2612 }
2613 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2614 
2615 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2616                char *buf)
2617 {
2618     struct cxgbi_endpoint *cep = ep->dd_data;
2619     struct cxgbi_sock *csk;
2620 
2621     log_debug(1 << CXGBI_DBG_ISCSI,
2622         "cls_conn 0x%p, param %d.\n", ep, param);
2623 
2624     switch (param) {
2625     case ISCSI_PARAM_CONN_PORT:
2626     case ISCSI_PARAM_CONN_ADDRESS:
2627         if (!cep)
2628             return -ENOTCONN;
2629 
2630         csk = cep->csk;
2631         if (!csk)
2632             return -ENOTCONN;
2633 
2634         return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2635                          &csk->daddr, param, buf);
2636     default:
2637         break;
2638     }
2639     return -ENOSYS;
2640 }
2641 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2642 
2643 struct iscsi_cls_conn *
2644 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2645 {
2646     struct iscsi_cls_conn *cls_conn;
2647     struct iscsi_conn *conn;
2648     struct iscsi_tcp_conn *tcp_conn;
2649     struct cxgbi_conn *cconn;
2650 
2651     cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2652     if (!cls_conn)
2653         return NULL;
2654 
2655     conn = cls_conn->dd_data;
2656     tcp_conn = conn->dd_data;
2657     cconn = tcp_conn->dd_data;
2658     cconn->iconn = conn;
2659 
2660     log_debug(1 << CXGBI_DBG_ISCSI,
2661         "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2662         cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2663 
2664     return cls_conn;
2665 }
2666 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2667 
2668 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2669                 struct iscsi_cls_conn *cls_conn,
2670                 u64 transport_eph, int is_leading)
2671 {
2672     struct iscsi_conn *conn = cls_conn->dd_data;
2673     struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2674     struct cxgbi_conn *cconn = tcp_conn->dd_data;
2675     struct cxgbi_ppm *ppm;
2676     struct iscsi_endpoint *ep;
2677     struct cxgbi_endpoint *cep;
2678     struct cxgbi_sock *csk;
2679     int err;
2680 
2681     ep = iscsi_lookup_endpoint(transport_eph);
2682     if (!ep)
2683         return -EINVAL;
2684 
2685     /*  setup ddp pagesize */
2686     cep = ep->dd_data;
2687     csk = cep->csk;
2688 
2689     ppm = csk->cdev->cdev2ppm(csk->cdev);
2690     err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2691                          ppm->tformat.pgsz_idx_dflt);
2692     if (err < 0)
2693         goto put_ep;
2694 
2695     err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2696     if (err) {
2697         err = -EINVAL;
2698         goto put_ep;
2699     }
2700 
2701     /*  calculate the tag idx bits needed for this conn based on cmds_max */
2702     cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2703 
2704     write_lock_bh(&csk->callback_lock);
2705     csk->user_data = conn;
2706     cconn->chba = cep->chba;
2707     cconn->cep = cep;
2708     cep->cconn = cconn;
2709     write_unlock_bh(&csk->callback_lock);
2710 
2711     cxgbi_conn_max_xmit_dlength(conn);
2712     cxgbi_conn_max_recv_dlength(conn);
2713 
2714     log_debug(1 << CXGBI_DBG_ISCSI,
2715         "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2716         cls_session, cls_conn, ep, cconn, csk);
2717     /*  init recv engine */
2718     iscsi_tcp_hdr_recv_prep(tcp_conn);
2719 
2720 put_ep:
2721     iscsi_put_endpoint(ep);
2722     return err;
2723 }
2724 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2725 
2726 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2727                         u16 cmds_max, u16 qdepth,
2728                         u32 initial_cmdsn)
2729 {
2730     struct cxgbi_endpoint *cep;
2731     struct cxgbi_hba *chba;
2732     struct Scsi_Host *shost;
2733     struct iscsi_cls_session *cls_session;
2734     struct iscsi_session *session;
2735 
2736     if (!ep) {
2737         pr_err("missing endpoint.\n");
2738         return NULL;
2739     }
2740 
2741     cep = ep->dd_data;
2742     chba = cep->chba;
2743     shost = chba->shost;
2744 
2745     BUG_ON(chba != iscsi_host_priv(shost));
2746 
2747     cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2748                     cmds_max, 0,
2749                     sizeof(struct iscsi_tcp_task) +
2750                     sizeof(struct cxgbi_task_data),
2751                     initial_cmdsn, ISCSI_MAX_TARGET);
2752     if (!cls_session)
2753         return NULL;
2754 
2755     session = cls_session->dd_data;
2756     if (iscsi_tcp_r2tpool_alloc(session))
2757         goto remove_session;
2758 
2759     log_debug(1 << CXGBI_DBG_ISCSI,
2760         "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2761     return cls_session;
2762 
2763 remove_session:
2764     iscsi_session_teardown(cls_session);
2765     return NULL;
2766 }
2767 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2768 
2769 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2770 {
2771     log_debug(1 << CXGBI_DBG_ISCSI,
2772         "cls sess 0x%p.\n", cls_session);
2773 
2774     iscsi_tcp_r2tpool_free(cls_session->dd_data);
2775     iscsi_session_teardown(cls_session);
2776 }
2777 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2778 
2779 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2780             char *buf, int buflen)
2781 {
2782     struct cxgbi_hba *chba = iscsi_host_priv(shost);
2783 
2784     if (!chba->ndev) {
2785         shost_printk(KERN_ERR, shost, "Could not get host param. "
2786                 "netdev for host not set.\n");
2787         return -ENODEV;
2788     }
2789 
2790     log_debug(1 << CXGBI_DBG_ISCSI,
2791         "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2792         shost, chba, chba->ndev->name, param, buflen, buf);
2793 
2794     switch (param) {
2795     case ISCSI_HOST_PARAM_IPADDRESS:
2796     {
2797         __be32 addr = in_aton(buf);
2798         log_debug(1 << CXGBI_DBG_ISCSI,
2799             "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2800         cxgbi_set_iscsi_ipv4(chba, addr);
2801         return 0;
2802     }
2803     case ISCSI_HOST_PARAM_HWADDRESS:
2804     case ISCSI_HOST_PARAM_NETDEV_NAME:
2805         return 0;
2806     default:
2807         return iscsi_host_set_param(shost, param, buf, buflen);
2808     }
2809 }
2810 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2811 
2812 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2813             char *buf)
2814 {
2815     struct cxgbi_hba *chba = iscsi_host_priv(shost);
2816     int len = 0;
2817 
2818     if (!chba->ndev) {
2819         shost_printk(KERN_ERR, shost, "Could not get host param. "
2820                 "netdev for host not set.\n");
2821         return -ENODEV;
2822     }
2823 
2824     log_debug(1 << CXGBI_DBG_ISCSI,
2825         "shost 0x%p, hba 0x%p,%s, param %d.\n",
2826         shost, chba, chba->ndev->name, param);
2827 
2828     switch (param) {
2829     case ISCSI_HOST_PARAM_HWADDRESS:
2830         len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2831         break;
2832     case ISCSI_HOST_PARAM_NETDEV_NAME:
2833         len = sprintf(buf, "%s\n", chba->ndev->name);
2834         break;
2835     case ISCSI_HOST_PARAM_IPADDRESS:
2836     {
2837         struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2838                                chba->port_id);
2839         if (csk) {
2840             len = sprintf(buf, "%pIS",
2841                       (struct sockaddr *)&csk->saddr);
2842         }
2843         log_debug(1 << CXGBI_DBG_ISCSI,
2844               "hba %s, addr %s.\n", chba->ndev->name, buf);
2845         break;
2846     }
2847     default:
2848         return iscsi_host_get_param(shost, param, buf);
2849     }
2850 
2851     return len;
2852 }
2853 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2854 
2855 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2856                     struct sockaddr *dst_addr,
2857                     int non_blocking)
2858 {
2859     struct iscsi_endpoint *ep;
2860     struct cxgbi_endpoint *cep;
2861     struct cxgbi_hba *hba = NULL;
2862     struct cxgbi_sock *csk;
2863     int ifindex = 0;
2864     int err = -EINVAL;
2865 
2866     log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2867         "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2868         shost, non_blocking, dst_addr);
2869 
2870     if (shost) {
2871         hba = iscsi_host_priv(shost);
2872         if (!hba) {
2873             pr_info("shost 0x%p, priv NULL.\n", shost);
2874             goto err_out;
2875         }
2876     }
2877 
2878 check_route:
2879     if (dst_addr->sa_family == AF_INET) {
2880         csk = cxgbi_check_route(dst_addr, ifindex);
2881 #if IS_ENABLED(CONFIG_IPV6)
2882     } else if (dst_addr->sa_family == AF_INET6) {
2883         csk = cxgbi_check_route6(dst_addr, ifindex);
2884 #endif
2885     } else {
2886         pr_info("address family 0x%x NOT supported.\n",
2887             dst_addr->sa_family);
2888         err = -EAFNOSUPPORT;
2889         return (struct iscsi_endpoint *)ERR_PTR(err);
2890     }
2891 
2892     if (IS_ERR(csk))
2893         return (struct iscsi_endpoint *)csk;
2894     cxgbi_sock_get(csk);
2895 
2896     if (!hba)
2897         hba = csk->cdev->hbas[csk->port_id];
2898     else if (hba != csk->cdev->hbas[csk->port_id]) {
2899         if (ifindex != hba->ndev->ifindex) {
2900             cxgbi_sock_put(csk);
2901             cxgbi_sock_closed(csk);
2902             ifindex = hba->ndev->ifindex;
2903             goto check_route;
2904         }
2905 
2906         pr_info("Could not connect through requested host %u"
2907             "hba 0x%p != 0x%p (%u).\n",
2908             shost->host_no, hba,
2909             csk->cdev->hbas[csk->port_id], csk->port_id);
2910         err = -ENOSPC;
2911         goto release_conn;
2912     }
2913 
2914     err = sock_get_port(csk);
2915     if (err)
2916         goto release_conn;
2917 
2918     cxgbi_sock_set_state(csk, CTP_CONNECTING);
2919     err = csk->cdev->csk_init_act_open(csk);
2920     if (err)
2921         goto release_conn;
2922 
2923     if (cxgbi_sock_is_closing(csk)) {
2924         err = -ENOSPC;
2925         pr_info("csk 0x%p is closing.\n", csk);
2926         goto release_conn;
2927     }
2928 
2929     ep = iscsi_create_endpoint(sizeof(*cep));
2930     if (!ep) {
2931         err = -ENOMEM;
2932         pr_info("iscsi alloc ep, OOM.\n");
2933         goto release_conn;
2934     }
2935 
2936     cep = ep->dd_data;
2937     cep->csk = csk;
2938     cep->chba = hba;
2939 
2940     log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2941         "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2942         ep, cep, csk, hba, hba->ndev->name);
2943     return ep;
2944 
2945 release_conn:
2946     cxgbi_sock_put(csk);
2947     cxgbi_sock_closed(csk);
2948 err_out:
2949     return ERR_PTR(err);
2950 }
2951 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2952 
2953 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2954 {
2955     struct cxgbi_endpoint *cep = ep->dd_data;
2956     struct cxgbi_sock *csk = cep->csk;
2957 
2958     if (!cxgbi_sock_is_established(csk))
2959         return 0;
2960     return 1;
2961 }
2962 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2963 
2964 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2965 {
2966     struct cxgbi_endpoint *cep = ep->dd_data;
2967     struct cxgbi_conn *cconn = cep->cconn;
2968     struct cxgbi_sock *csk = cep->csk;
2969 
2970     log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2971         "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2972         ep, cep, cconn, csk, csk->state, csk->flags);
2973 
2974     if (cconn && cconn->iconn) {
2975         write_lock_bh(&csk->callback_lock);
2976         cep->csk->user_data = NULL;
2977         cconn->cep = NULL;
2978         write_unlock_bh(&csk->callback_lock);
2979     }
2980     iscsi_destroy_endpoint(ep);
2981 
2982     if (likely(csk->state >= CTP_ESTABLISHED))
2983         need_active_close(csk);
2984     else
2985         cxgbi_sock_closed(csk);
2986 
2987     cxgbi_sock_put(csk);
2988 }
2989 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2990 
2991 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2992             struct scsi_transport_template **stt)
2993 {
2994     *stt = iscsi_register_transport(itp);
2995     if (*stt == NULL) {
2996         pr_err("unable to register %s transport 0x%p.\n",
2997             itp->name, itp);
2998         return -ENODEV;
2999     }
3000     log_debug(1 << CXGBI_DBG_ISCSI,
3001         "%s, registered iscsi transport 0x%p.\n",
3002         itp->name, stt);
3003     return 0;
3004 }
3005 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
3006 
3007 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
3008             struct scsi_transport_template **stt)
3009 {
3010     if (*stt) {
3011         log_debug(1 << CXGBI_DBG_ISCSI,
3012             "de-register transport 0x%p, %s, stt 0x%p.\n",
3013             itp, itp->name, *stt);
3014         *stt = NULL;
3015         iscsi_unregister_transport(itp);
3016     }
3017 }
3018 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
3019 
3020 umode_t cxgbi_attr_is_visible(int param_type, int param)
3021 {
3022     switch (param_type) {
3023     case ISCSI_HOST_PARAM:
3024         switch (param) {
3025         case ISCSI_HOST_PARAM_NETDEV_NAME:
3026         case ISCSI_HOST_PARAM_HWADDRESS:
3027         case ISCSI_HOST_PARAM_IPADDRESS:
3028         case ISCSI_HOST_PARAM_INITIATOR_NAME:
3029             return S_IRUGO;
3030         default:
3031             return 0;
3032         }
3033     case ISCSI_PARAM:
3034         switch (param) {
3035         case ISCSI_PARAM_MAX_RECV_DLENGTH:
3036         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3037         case ISCSI_PARAM_HDRDGST_EN:
3038         case ISCSI_PARAM_DATADGST_EN:
3039         case ISCSI_PARAM_CONN_ADDRESS:
3040         case ISCSI_PARAM_CONN_PORT:
3041         case ISCSI_PARAM_EXP_STATSN:
3042         case ISCSI_PARAM_PERSISTENT_ADDRESS:
3043         case ISCSI_PARAM_PERSISTENT_PORT:
3044         case ISCSI_PARAM_PING_TMO:
3045         case ISCSI_PARAM_RECV_TMO:
3046         case ISCSI_PARAM_INITIAL_R2T_EN:
3047         case ISCSI_PARAM_MAX_R2T:
3048         case ISCSI_PARAM_IMM_DATA_EN:
3049         case ISCSI_PARAM_FIRST_BURST:
3050         case ISCSI_PARAM_MAX_BURST:
3051         case ISCSI_PARAM_PDU_INORDER_EN:
3052         case ISCSI_PARAM_DATASEQ_INORDER_EN:
3053         case ISCSI_PARAM_ERL:
3054         case ISCSI_PARAM_TARGET_NAME:
3055         case ISCSI_PARAM_TPGT:
3056         case ISCSI_PARAM_USERNAME:
3057         case ISCSI_PARAM_PASSWORD:
3058         case ISCSI_PARAM_USERNAME_IN:
3059         case ISCSI_PARAM_PASSWORD_IN:
3060         case ISCSI_PARAM_FAST_ABORT:
3061         case ISCSI_PARAM_ABORT_TMO:
3062         case ISCSI_PARAM_LU_RESET_TMO:
3063         case ISCSI_PARAM_TGT_RESET_TMO:
3064         case ISCSI_PARAM_IFACE_NAME:
3065         case ISCSI_PARAM_INITIATOR_NAME:
3066             return S_IRUGO;
3067         default:
3068             return 0;
3069         }
3070     }
3071 
3072     return 0;
3073 }
3074 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
3075 
3076 static int __init libcxgbi_init_module(void)
3077 {
3078     pr_info("%s", version);
3079 
3080     BUILD_BUG_ON(sizeof_field(struct sk_buff, cb) <
3081              sizeof(struct cxgbi_skb_cb));
3082     rsvd_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3083     if (!rsvd_page)
3084         return -ENOMEM;
3085 
3086     return 0;
3087 }
3088 
3089 static void __exit libcxgbi_exit_module(void)
3090 {
3091     cxgbi_device_unregister_all(0xFF);
3092     put_page(rsvd_page);
3093     return;
3094 }
3095 
3096 module_init(libcxgbi_init_module);
3097 module_exit(libcxgbi_exit_module);
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