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0001 /* bnx2fc_io.c: QLogic Linux FCoE offload driver.
0002  * IO manager and SCSI IO processing.
0003  *
0004  * Copyright (c) 2008-2013 Broadcom Corporation
0005  * Copyright (c) 2014-2016 QLogic Corporation
0006  * Copyright (c) 2016-2017 Cavium Inc.
0007  *
0008  * This program is free software; you can redistribute it and/or modify
0009  * it under the terms of the GNU General Public License as published by
0010  * the Free Software Foundation.
0011  *
0012  * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
0013  */
0014 
0015 #include "bnx2fc.h"
0016 
0017 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
0018 
0019 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
0020                int bd_index);
0021 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
0022 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
0023 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
0024 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
0025 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
0026                  struct fcoe_fcp_rsp_payload *fcp_rsp,
0027                  u8 num_rq, unsigned char *rq_data);
0028 
0029 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
0030               unsigned int timer_msec)
0031 {
0032     struct bnx2fc_interface *interface = io_req->port->priv;
0033 
0034     if (queue_delayed_work(interface->timer_work_queue,
0035                    &io_req->timeout_work,
0036                    msecs_to_jiffies(timer_msec)))
0037         kref_get(&io_req->refcount);
0038 }
0039 
0040 static void bnx2fc_cmd_timeout(struct work_struct *work)
0041 {
0042     struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
0043                          timeout_work.work);
0044     u8 cmd_type = io_req->cmd_type;
0045     struct bnx2fc_rport *tgt = io_req->tgt;
0046     int rc;
0047 
0048     BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
0049               "req_flags = %lx\n", cmd_type, io_req->req_flags);
0050 
0051     spin_lock_bh(&tgt->tgt_lock);
0052     if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
0053         clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
0054         /*
0055          * ideally we should hold the io_req until RRQ complets,
0056          * and release io_req from timeout hold.
0057          */
0058         spin_unlock_bh(&tgt->tgt_lock);
0059         bnx2fc_send_rrq(io_req);
0060         return;
0061     }
0062     if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
0063         BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
0064         goto done;
0065     }
0066 
0067     switch (cmd_type) {
0068     case BNX2FC_SCSI_CMD:
0069         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
0070                             &io_req->req_flags)) {
0071             /* Handle eh_abort timeout */
0072             BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
0073             complete(&io_req->abts_done);
0074         } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
0075                     &io_req->req_flags)) {
0076             /* Handle internally generated ABTS timeout */
0077             BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
0078                     kref_read(&io_req->refcount));
0079             if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
0080                            &io_req->req_flags))) {
0081                 /*
0082                  * Cleanup and return original command to
0083                  * mid-layer.
0084                  */
0085                 bnx2fc_initiate_cleanup(io_req);
0086                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
0087                 spin_unlock_bh(&tgt->tgt_lock);
0088 
0089                 return;
0090             }
0091         } else {
0092             /* Hanlde IO timeout */
0093             BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
0094             if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
0095                          &io_req->req_flags)) {
0096                 BNX2FC_IO_DBG(io_req, "IO completed before "
0097                                " timer expiry\n");
0098                 goto done;
0099             }
0100 
0101             if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
0102                           &io_req->req_flags)) {
0103                 rc = bnx2fc_initiate_abts(io_req);
0104                 if (rc == SUCCESS)
0105                     goto done;
0106 
0107                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
0108                 spin_unlock_bh(&tgt->tgt_lock);
0109 
0110                 return;
0111             } else {
0112                 BNX2FC_IO_DBG(io_req, "IO already in "
0113                               "ABTS processing\n");
0114             }
0115         }
0116         break;
0117     case BNX2FC_ELS:
0118 
0119         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
0120             BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
0121 
0122             if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
0123                           &io_req->req_flags)) {
0124                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
0125                 spin_unlock_bh(&tgt->tgt_lock);
0126 
0127                 return;
0128             }
0129         } else {
0130             /*
0131              * Handle ELS timeout.
0132              * tgt_lock is used to sync compl path and timeout
0133              * path. If els compl path is processing this IO, we
0134              * have nothing to do here, just release the timer hold
0135              */
0136             BNX2FC_IO_DBG(io_req, "ELS timed out\n");
0137             if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
0138                            &io_req->req_flags))
0139                 goto done;
0140 
0141             /* Indicate the cb_func that this ELS is timed out */
0142             set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
0143 
0144             if ((io_req->cb_func) && (io_req->cb_arg)) {
0145                 io_req->cb_func(io_req->cb_arg);
0146                 io_req->cb_arg = NULL;
0147             }
0148         }
0149         break;
0150     default:
0151         printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
0152             cmd_type);
0153         break;
0154     }
0155 
0156 done:
0157     /* release the cmd that was held when timer was set */
0158     kref_put(&io_req->refcount, bnx2fc_cmd_release);
0159     spin_unlock_bh(&tgt->tgt_lock);
0160 }
0161 
0162 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
0163 {
0164     /* Called with host lock held */
0165     struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
0166 
0167     /*
0168      * active_cmd_queue may have other command types as well,
0169      * and during flush operation,  we want to error back only
0170      * scsi commands.
0171      */
0172     if (io_req->cmd_type != BNX2FC_SCSI_CMD)
0173         return;
0174 
0175     BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
0176     if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
0177         /* Do not call scsi done for this IO */
0178         return;
0179     }
0180 
0181     bnx2fc_unmap_sg_list(io_req);
0182     io_req->sc_cmd = NULL;
0183 
0184     /* Sanity checks before returning command to mid-layer */
0185     if (!sc_cmd) {
0186         printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
0187                     "IO(0x%x) already cleaned up\n",
0188                io_req->xid);
0189         return;
0190     }
0191     if (!sc_cmd->device) {
0192         pr_err(PFX "0x%x: sc_cmd->device is NULL.\n", io_req->xid);
0193         return;
0194     }
0195     if (!sc_cmd->device->host) {
0196         pr_err(PFX "0x%x: sc_cmd->device->host is NULL.\n",
0197             io_req->xid);
0198         return;
0199     }
0200 
0201     sc_cmd->result = err_code << 16;
0202 
0203     BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
0204         sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
0205         sc_cmd->allowed);
0206     scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
0207     bnx2fc_priv(sc_cmd)->io_req = NULL;
0208     scsi_done(sc_cmd);
0209 }
0210 
0211 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
0212 {
0213     struct bnx2fc_cmd_mgr *cmgr;
0214     struct io_bdt *bdt_info;
0215     struct bnx2fc_cmd *io_req;
0216     size_t len;
0217     u32 mem_size;
0218     u16 xid;
0219     int i;
0220     int num_ios, num_pri_ios;
0221     size_t bd_tbl_sz;
0222     int arr_sz = num_possible_cpus() + 1;
0223     u16 min_xid = BNX2FC_MIN_XID;
0224     u16 max_xid = hba->max_xid;
0225 
0226     if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
0227         printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
0228                     and max_xid 0x%x\n", min_xid, max_xid);
0229         return NULL;
0230     }
0231     BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
0232 
0233     num_ios = max_xid - min_xid + 1;
0234     len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
0235     len += sizeof(struct bnx2fc_cmd_mgr);
0236 
0237     cmgr = kzalloc(len, GFP_KERNEL);
0238     if (!cmgr) {
0239         printk(KERN_ERR PFX "failed to alloc cmgr\n");
0240         return NULL;
0241     }
0242 
0243     cmgr->hba = hba;
0244     cmgr->free_list = kcalloc(arr_sz, sizeof(*cmgr->free_list),
0245                   GFP_KERNEL);
0246     if (!cmgr->free_list) {
0247         printk(KERN_ERR PFX "failed to alloc free_list\n");
0248         goto mem_err;
0249     }
0250 
0251     cmgr->free_list_lock = kcalloc(arr_sz, sizeof(*cmgr->free_list_lock),
0252                        GFP_KERNEL);
0253     if (!cmgr->free_list_lock) {
0254         printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
0255         kfree(cmgr->free_list);
0256         cmgr->free_list = NULL;
0257         goto mem_err;
0258     }
0259 
0260     cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
0261 
0262     for (i = 0; i < arr_sz; i++)  {
0263         INIT_LIST_HEAD(&cmgr->free_list[i]);
0264         spin_lock_init(&cmgr->free_list_lock[i]);
0265     }
0266 
0267     /*
0268      * Pre-allocated pool of bnx2fc_cmds.
0269      * Last entry in the free list array is the free list
0270      * of slow path requests.
0271      */
0272     xid = BNX2FC_MIN_XID;
0273     num_pri_ios = num_ios - hba->elstm_xids;
0274     for (i = 0; i < num_ios; i++) {
0275         io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
0276 
0277         if (!io_req) {
0278             printk(KERN_ERR PFX "failed to alloc io_req\n");
0279             goto mem_err;
0280         }
0281 
0282         INIT_LIST_HEAD(&io_req->link);
0283         INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
0284 
0285         io_req->xid = xid++;
0286         if (i < num_pri_ios)
0287             list_add_tail(&io_req->link,
0288                 &cmgr->free_list[io_req->xid %
0289                          num_possible_cpus()]);
0290         else
0291             list_add_tail(&io_req->link,
0292                 &cmgr->free_list[num_possible_cpus()]);
0293         io_req++;
0294     }
0295 
0296     /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
0297     mem_size = num_ios * sizeof(struct io_bdt *);
0298     cmgr->io_bdt_pool = kzalloc(mem_size, GFP_KERNEL);
0299     if (!cmgr->io_bdt_pool) {
0300         printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
0301         goto mem_err;
0302     }
0303 
0304     mem_size = sizeof(struct io_bdt);
0305     for (i = 0; i < num_ios; i++) {
0306         cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
0307         if (!cmgr->io_bdt_pool[i]) {
0308             printk(KERN_ERR PFX "failed to alloc "
0309                 "io_bdt_pool[%d]\n", i);
0310             goto mem_err;
0311         }
0312     }
0313 
0314     /* Allocate an map fcoe_bdt_ctx structures */
0315     bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
0316     for (i = 0; i < num_ios; i++) {
0317         bdt_info = cmgr->io_bdt_pool[i];
0318         bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
0319                               bd_tbl_sz,
0320                               &bdt_info->bd_tbl_dma,
0321                               GFP_KERNEL);
0322         if (!bdt_info->bd_tbl) {
0323             printk(KERN_ERR PFX "failed to alloc "
0324                 "bdt_tbl[%d]\n", i);
0325             goto mem_err;
0326         }
0327     }
0328 
0329     return cmgr;
0330 
0331 mem_err:
0332     bnx2fc_cmd_mgr_free(cmgr);
0333     return NULL;
0334 }
0335 
0336 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
0337 {
0338     struct io_bdt *bdt_info;
0339     struct bnx2fc_hba *hba = cmgr->hba;
0340     size_t bd_tbl_sz;
0341     u16 min_xid = BNX2FC_MIN_XID;
0342     u16 max_xid = hba->max_xid;
0343     int num_ios;
0344     int i;
0345 
0346     num_ios = max_xid - min_xid + 1;
0347 
0348     /* Free fcoe_bdt_ctx structures */
0349     if (!cmgr->io_bdt_pool)
0350         goto free_cmd_pool;
0351 
0352     bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
0353     for (i = 0; i < num_ios; i++) {
0354         bdt_info = cmgr->io_bdt_pool[i];
0355         if (bdt_info->bd_tbl) {
0356             dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
0357                         bdt_info->bd_tbl,
0358                         bdt_info->bd_tbl_dma);
0359             bdt_info->bd_tbl = NULL;
0360         }
0361     }
0362 
0363     /* Destroy io_bdt pool */
0364     for (i = 0; i < num_ios; i++) {
0365         kfree(cmgr->io_bdt_pool[i]);
0366         cmgr->io_bdt_pool[i] = NULL;
0367     }
0368 
0369     kfree(cmgr->io_bdt_pool);
0370     cmgr->io_bdt_pool = NULL;
0371 
0372 free_cmd_pool:
0373     kfree(cmgr->free_list_lock);
0374 
0375     /* Destroy cmd pool */
0376     if (!cmgr->free_list)
0377         goto free_cmgr;
0378 
0379     for (i = 0; i < num_possible_cpus() + 1; i++)  {
0380         struct bnx2fc_cmd *tmp, *io_req;
0381 
0382         list_for_each_entry_safe(io_req, tmp,
0383                      &cmgr->free_list[i], link) {
0384             list_del(&io_req->link);
0385             kfree(io_req);
0386         }
0387     }
0388     kfree(cmgr->free_list);
0389 free_cmgr:
0390     /* Free command manager itself */
0391     kfree(cmgr);
0392 }
0393 
0394 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
0395 {
0396     struct fcoe_port *port = tgt->port;
0397     struct bnx2fc_interface *interface = port->priv;
0398     struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
0399     struct bnx2fc_cmd *io_req;
0400     struct list_head *listp;
0401     struct io_bdt *bd_tbl;
0402     int index = RESERVE_FREE_LIST_INDEX;
0403     u32 free_sqes;
0404     u32 max_sqes;
0405     u16 xid;
0406 
0407     max_sqes = tgt->max_sqes;
0408     switch (type) {
0409     case BNX2FC_TASK_MGMT_CMD:
0410         max_sqes = BNX2FC_TM_MAX_SQES;
0411         break;
0412     case BNX2FC_ELS:
0413         max_sqes = BNX2FC_ELS_MAX_SQES;
0414         break;
0415     default:
0416         break;
0417     }
0418 
0419     /*
0420      * NOTE: Free list insertions and deletions are protected with
0421      * cmgr lock
0422      */
0423     spin_lock_bh(&cmd_mgr->free_list_lock[index]);
0424     free_sqes = atomic_read(&tgt->free_sqes);
0425     if ((list_empty(&(cmd_mgr->free_list[index]))) ||
0426         (tgt->num_active_ios.counter  >= max_sqes) ||
0427         (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
0428         BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
0429             "ios(%d):sqes(%d)\n",
0430             tgt->num_active_ios.counter, tgt->max_sqes);
0431         if (list_empty(&(cmd_mgr->free_list[index])))
0432             printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
0433         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
0434         return NULL;
0435     }
0436 
0437     listp = (struct list_head *)
0438             cmd_mgr->free_list[index].next;
0439     list_del_init(listp);
0440     io_req = (struct bnx2fc_cmd *) listp;
0441     xid = io_req->xid;
0442     cmd_mgr->cmds[xid] = io_req;
0443     atomic_inc(&tgt->num_active_ios);
0444     atomic_dec(&tgt->free_sqes);
0445     spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
0446 
0447     INIT_LIST_HEAD(&io_req->link);
0448 
0449     io_req->port = port;
0450     io_req->cmd_mgr = cmd_mgr;
0451     io_req->req_flags = 0;
0452     io_req->cmd_type = type;
0453 
0454     /* Bind io_bdt for this io_req */
0455     /* Have a static link between io_req and io_bdt_pool */
0456     bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
0457     bd_tbl->io_req = io_req;
0458 
0459     /* Hold the io_req  against deletion */
0460     kref_init(&io_req->refcount);
0461     return io_req;
0462 }
0463 
0464 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
0465 {
0466     struct fcoe_port *port = tgt->port;
0467     struct bnx2fc_interface *interface = port->priv;
0468     struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
0469     struct bnx2fc_cmd *io_req;
0470     struct list_head *listp;
0471     struct io_bdt *bd_tbl;
0472     u32 free_sqes;
0473     u32 max_sqes;
0474     u16 xid;
0475     int index = raw_smp_processor_id();
0476 
0477     max_sqes = BNX2FC_SCSI_MAX_SQES;
0478     /*
0479      * NOTE: Free list insertions and deletions are protected with
0480      * cmgr lock
0481      */
0482     spin_lock_bh(&cmd_mgr->free_list_lock[index]);
0483     free_sqes = atomic_read(&tgt->free_sqes);
0484     if ((list_empty(&cmd_mgr->free_list[index])) ||
0485         (tgt->num_active_ios.counter  >= max_sqes) ||
0486         (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
0487         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
0488         return NULL;
0489     }
0490 
0491     listp = (struct list_head *)
0492         cmd_mgr->free_list[index].next;
0493     list_del_init(listp);
0494     io_req = (struct bnx2fc_cmd *) listp;
0495     xid = io_req->xid;
0496     cmd_mgr->cmds[xid] = io_req;
0497     atomic_inc(&tgt->num_active_ios);
0498     atomic_dec(&tgt->free_sqes);
0499     spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
0500 
0501     INIT_LIST_HEAD(&io_req->link);
0502 
0503     io_req->port = port;
0504     io_req->cmd_mgr = cmd_mgr;
0505     io_req->req_flags = 0;
0506 
0507     /* Bind io_bdt for this io_req */
0508     /* Have a static link between io_req and io_bdt_pool */
0509     bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
0510     bd_tbl->io_req = io_req;
0511 
0512     /* Hold the io_req  against deletion */
0513     kref_init(&io_req->refcount);
0514     return io_req;
0515 }
0516 
0517 void bnx2fc_cmd_release(struct kref *ref)
0518 {
0519     struct bnx2fc_cmd *io_req = container_of(ref,
0520                         struct bnx2fc_cmd, refcount);
0521     struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
0522     int index;
0523 
0524     if (io_req->cmd_type == BNX2FC_SCSI_CMD)
0525         index = io_req->xid % num_possible_cpus();
0526     else
0527         index = RESERVE_FREE_LIST_INDEX;
0528 
0529 
0530     spin_lock_bh(&cmd_mgr->free_list_lock[index]);
0531     if (io_req->cmd_type != BNX2FC_SCSI_CMD)
0532         bnx2fc_free_mp_resc(io_req);
0533     cmd_mgr->cmds[io_req->xid] = NULL;
0534     /* Delete IO from retire queue */
0535     list_del_init(&io_req->link);
0536     /* Add it to the free list */
0537     list_add(&io_req->link,
0538             &cmd_mgr->free_list[index]);
0539     atomic_dec(&io_req->tgt->num_active_ios);
0540     spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
0541 
0542 }
0543 
0544 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
0545 {
0546     struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
0547     struct bnx2fc_interface *interface = io_req->port->priv;
0548     struct bnx2fc_hba *hba = interface->hba;
0549     size_t sz = sizeof(struct fcoe_bd_ctx);
0550 
0551     /* clear tm flags */
0552     mp_req->tm_flags = 0;
0553     if (mp_req->mp_req_bd) {
0554         dma_free_coherent(&hba->pcidev->dev, sz,
0555                      mp_req->mp_req_bd,
0556                      mp_req->mp_req_bd_dma);
0557         mp_req->mp_req_bd = NULL;
0558     }
0559     if (mp_req->mp_resp_bd) {
0560         dma_free_coherent(&hba->pcidev->dev, sz,
0561                      mp_req->mp_resp_bd,
0562                      mp_req->mp_resp_bd_dma);
0563         mp_req->mp_resp_bd = NULL;
0564     }
0565     if (mp_req->req_buf) {
0566         dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
0567                      mp_req->req_buf,
0568                      mp_req->req_buf_dma);
0569         mp_req->req_buf = NULL;
0570     }
0571     if (mp_req->resp_buf) {
0572         dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
0573                      mp_req->resp_buf,
0574                      mp_req->resp_buf_dma);
0575         mp_req->resp_buf = NULL;
0576     }
0577 }
0578 
0579 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
0580 {
0581     struct bnx2fc_mp_req *mp_req;
0582     struct fcoe_bd_ctx *mp_req_bd;
0583     struct fcoe_bd_ctx *mp_resp_bd;
0584     struct bnx2fc_interface *interface = io_req->port->priv;
0585     struct bnx2fc_hba *hba = interface->hba;
0586     dma_addr_t addr;
0587     size_t sz;
0588 
0589     mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
0590     memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
0591 
0592     if (io_req->cmd_type != BNX2FC_ELS) {
0593         mp_req->req_len = sizeof(struct fcp_cmnd);
0594         io_req->data_xfer_len = mp_req->req_len;
0595     } else
0596         mp_req->req_len = io_req->data_xfer_len;
0597 
0598     mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
0599                          &mp_req->req_buf_dma,
0600                          GFP_ATOMIC);
0601     if (!mp_req->req_buf) {
0602         printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
0603         bnx2fc_free_mp_resc(io_req);
0604         return FAILED;
0605     }
0606 
0607     mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
0608                           &mp_req->resp_buf_dma,
0609                           GFP_ATOMIC);
0610     if (!mp_req->resp_buf) {
0611         printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
0612         bnx2fc_free_mp_resc(io_req);
0613         return FAILED;
0614     }
0615     memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
0616     memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
0617 
0618     /* Allocate and map mp_req_bd and mp_resp_bd */
0619     sz = sizeof(struct fcoe_bd_ctx);
0620     mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
0621                          &mp_req->mp_req_bd_dma,
0622                          GFP_ATOMIC);
0623     if (!mp_req->mp_req_bd) {
0624         printk(KERN_ERR PFX "unable to alloc MP req bd\n");
0625         bnx2fc_free_mp_resc(io_req);
0626         return FAILED;
0627     }
0628     mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
0629                          &mp_req->mp_resp_bd_dma,
0630                          GFP_ATOMIC);
0631     if (!mp_req->mp_resp_bd) {
0632         printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
0633         bnx2fc_free_mp_resc(io_req);
0634         return FAILED;
0635     }
0636     /* Fill bd table */
0637     addr = mp_req->req_buf_dma;
0638     mp_req_bd = mp_req->mp_req_bd;
0639     mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
0640     mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
0641     mp_req_bd->buf_len = CNIC_PAGE_SIZE;
0642     mp_req_bd->flags = 0;
0643 
0644     /*
0645      * MP buffer is either a task mgmt command or an ELS.
0646      * So the assumption is that it consumes a single bd
0647      * entry in the bd table
0648      */
0649     mp_resp_bd = mp_req->mp_resp_bd;
0650     addr = mp_req->resp_buf_dma;
0651     mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
0652     mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
0653     mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
0654     mp_resp_bd->flags = 0;
0655 
0656     return SUCCESS;
0657 }
0658 
0659 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
0660 {
0661     struct fc_lport *lport;
0662     struct fc_rport *rport;
0663     struct fc_rport_libfc_priv *rp;
0664     struct fcoe_port *port;
0665     struct bnx2fc_interface *interface;
0666     struct bnx2fc_rport *tgt;
0667     struct bnx2fc_cmd *io_req;
0668     struct bnx2fc_mp_req *tm_req;
0669     struct fcoe_task_ctx_entry *task;
0670     struct fcoe_task_ctx_entry *task_page;
0671     struct Scsi_Host *host = sc_cmd->device->host;
0672     struct fc_frame_header *fc_hdr;
0673     struct fcp_cmnd *fcp_cmnd;
0674     int task_idx, index;
0675     int rc = SUCCESS;
0676     u16 xid;
0677     u32 sid, did;
0678     unsigned long start = jiffies;
0679 
0680     lport = shost_priv(host);
0681     rport = starget_to_rport(scsi_target(sc_cmd->device));
0682     port = lport_priv(lport);
0683     interface = port->priv;
0684 
0685     if (rport == NULL) {
0686         printk(KERN_ERR PFX "device_reset: rport is NULL\n");
0687         rc = FAILED;
0688         goto tmf_err;
0689     }
0690     rp = rport->dd_data;
0691 
0692     rc = fc_block_scsi_eh(sc_cmd);
0693     if (rc)
0694         return rc;
0695 
0696     if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
0697         printk(KERN_ERR PFX "device_reset: link is not ready\n");
0698         rc = FAILED;
0699         goto tmf_err;
0700     }
0701     /* rport and tgt are allocated together, so tgt should be non-NULL */
0702     tgt = (struct bnx2fc_rport *)&rp[1];
0703 
0704     if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
0705         printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
0706         rc = FAILED;
0707         goto tmf_err;
0708     }
0709 retry_tmf:
0710     io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
0711     if (!io_req) {
0712         if (time_after(jiffies, start + HZ)) {
0713             printk(KERN_ERR PFX "tmf: Failed TMF");
0714             rc = FAILED;
0715             goto tmf_err;
0716         }
0717         msleep(20);
0718         goto retry_tmf;
0719     }
0720     /* Initialize rest of io_req fields */
0721     io_req->sc_cmd = sc_cmd;
0722     io_req->port = port;
0723     io_req->tgt = tgt;
0724 
0725     tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
0726 
0727     rc = bnx2fc_init_mp_req(io_req);
0728     if (rc == FAILED) {
0729         printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
0730         spin_lock_bh(&tgt->tgt_lock);
0731         kref_put(&io_req->refcount, bnx2fc_cmd_release);
0732         spin_unlock_bh(&tgt->tgt_lock);
0733         goto tmf_err;
0734     }
0735 
0736     /* Set TM flags */
0737     io_req->io_req_flags = 0;
0738     tm_req->tm_flags = tm_flags;
0739 
0740     /* Fill FCP_CMND */
0741     bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
0742     fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
0743     memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
0744     fcp_cmnd->fc_dl = 0;
0745 
0746     /* Fill FC header */
0747     fc_hdr = &(tm_req->req_fc_hdr);
0748     sid = tgt->sid;
0749     did = rport->port_id;
0750     __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
0751                FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
0752                FC_FC_SEQ_INIT, 0);
0753     /* Obtain exchange id */
0754     xid = io_req->xid;
0755 
0756     BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
0757     task_idx = xid/BNX2FC_TASKS_PER_PAGE;
0758     index = xid % BNX2FC_TASKS_PER_PAGE;
0759 
0760     /* Initialize task context for this IO request */
0761     task_page = (struct fcoe_task_ctx_entry *)
0762             interface->hba->task_ctx[task_idx];
0763     task = &(task_page[index]);
0764     bnx2fc_init_mp_task(io_req, task);
0765 
0766     bnx2fc_priv(sc_cmd)->io_req = io_req;
0767 
0768     /* Obtain free SQ entry */
0769     spin_lock_bh(&tgt->tgt_lock);
0770     bnx2fc_add_2_sq(tgt, xid);
0771 
0772     /* Enqueue the io_req to active_tm_queue */
0773     io_req->on_tmf_queue = 1;
0774     list_add_tail(&io_req->link, &tgt->active_tm_queue);
0775 
0776     init_completion(&io_req->abts_done);
0777     io_req->wait_for_abts_comp = 1;
0778 
0779     /* Ring doorbell */
0780     bnx2fc_ring_doorbell(tgt);
0781     spin_unlock_bh(&tgt->tgt_lock);
0782 
0783     rc = wait_for_completion_timeout(&io_req->abts_done,
0784                      interface->tm_timeout * HZ);
0785     spin_lock_bh(&tgt->tgt_lock);
0786 
0787     io_req->wait_for_abts_comp = 0;
0788     if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
0789         set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
0790         if (io_req->on_tmf_queue) {
0791             list_del_init(&io_req->link);
0792             io_req->on_tmf_queue = 0;
0793         }
0794         io_req->wait_for_cleanup_comp = 1;
0795         init_completion(&io_req->cleanup_done);
0796         bnx2fc_initiate_cleanup(io_req);
0797         spin_unlock_bh(&tgt->tgt_lock);
0798         rc = wait_for_completion_timeout(&io_req->cleanup_done,
0799                          BNX2FC_FW_TIMEOUT);
0800         spin_lock_bh(&tgt->tgt_lock);
0801         io_req->wait_for_cleanup_comp = 0;
0802         if (!rc)
0803             kref_put(&io_req->refcount, bnx2fc_cmd_release);
0804     }
0805 
0806     spin_unlock_bh(&tgt->tgt_lock);
0807 
0808     if (!rc) {
0809         BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
0810         rc = FAILED;
0811     } else {
0812         BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
0813         rc = SUCCESS;
0814     }
0815 tmf_err:
0816     return rc;
0817 }
0818 
0819 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
0820 {
0821     struct fc_lport *lport;
0822     struct bnx2fc_rport *tgt = io_req->tgt;
0823     struct fc_rport *rport = tgt->rport;
0824     struct fc_rport_priv *rdata = tgt->rdata;
0825     struct bnx2fc_interface *interface;
0826     struct fcoe_port *port;
0827     struct bnx2fc_cmd *abts_io_req;
0828     struct fcoe_task_ctx_entry *task;
0829     struct fcoe_task_ctx_entry *task_page;
0830     struct fc_frame_header *fc_hdr;
0831     struct bnx2fc_mp_req *abts_req;
0832     int task_idx, index;
0833     u32 sid, did;
0834     u16 xid;
0835     int rc = SUCCESS;
0836     u32 r_a_tov = rdata->r_a_tov;
0837 
0838     /* called with tgt_lock held */
0839     BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
0840 
0841     port = io_req->port;
0842     interface = port->priv;
0843     lport = port->lport;
0844 
0845     if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
0846         printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
0847         rc = FAILED;
0848         goto abts_err;
0849     }
0850 
0851     if (rport == NULL) {
0852         printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
0853         rc = FAILED;
0854         goto abts_err;
0855     }
0856 
0857     if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
0858         printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
0859         rc = FAILED;
0860         goto abts_err;
0861     }
0862 
0863     abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
0864     if (!abts_io_req) {
0865         printk(KERN_ERR PFX "abts: couldn't allocate cmd\n");
0866         rc = FAILED;
0867         goto abts_err;
0868     }
0869 
0870     /* Initialize rest of io_req fields */
0871     abts_io_req->sc_cmd = NULL;
0872     abts_io_req->port = port;
0873     abts_io_req->tgt = tgt;
0874     abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
0875 
0876     abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
0877     memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
0878 
0879     /* Fill FC header */
0880     fc_hdr = &(abts_req->req_fc_hdr);
0881 
0882     /* Obtain oxid and rxid for the original exchange to be aborted */
0883     fc_hdr->fh_ox_id = htons(io_req->xid);
0884     fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
0885 
0886     sid = tgt->sid;
0887     did = rport->port_id;
0888 
0889     __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
0890                FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
0891                FC_FC_SEQ_INIT, 0);
0892 
0893     xid = abts_io_req->xid;
0894     BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
0895     task_idx = xid/BNX2FC_TASKS_PER_PAGE;
0896     index = xid % BNX2FC_TASKS_PER_PAGE;
0897 
0898     /* Initialize task context for this IO request */
0899     task_page = (struct fcoe_task_ctx_entry *)
0900             interface->hba->task_ctx[task_idx];
0901     task = &(task_page[index]);
0902     bnx2fc_init_mp_task(abts_io_req, task);
0903 
0904     /*
0905      * ABTS task is a temporary task that will be cleaned up
0906      * irrespective of ABTS response. We need to start the timer
0907      * for the original exchange, as the CQE is posted for the original
0908      * IO request.
0909      *
0910      * Timer for ABTS is started only when it is originated by a
0911      * TM request. For the ABTS issued as part of ULP timeout,
0912      * scsi-ml maintains the timers.
0913      */
0914 
0915     /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
0916     bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
0917 
0918     /* Obtain free SQ entry */
0919     bnx2fc_add_2_sq(tgt, xid);
0920 
0921     /* Ring doorbell */
0922     bnx2fc_ring_doorbell(tgt);
0923 
0924 abts_err:
0925     return rc;
0926 }
0927 
0928 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
0929                 enum fc_rctl r_ctl)
0930 {
0931     struct bnx2fc_rport *tgt = orig_io_req->tgt;
0932     struct bnx2fc_interface *interface;
0933     struct fcoe_port *port;
0934     struct bnx2fc_cmd *seq_clnp_req;
0935     struct fcoe_task_ctx_entry *task;
0936     struct fcoe_task_ctx_entry *task_page;
0937     struct bnx2fc_els_cb_arg *cb_arg = NULL;
0938     int task_idx, index;
0939     u16 xid;
0940     int rc = 0;
0941 
0942     BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
0943            orig_io_req->xid);
0944     kref_get(&orig_io_req->refcount);
0945 
0946     port = orig_io_req->port;
0947     interface = port->priv;
0948 
0949     cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
0950     if (!cb_arg) {
0951         printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
0952         rc = -ENOMEM;
0953         goto cleanup_err;
0954     }
0955 
0956     seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
0957     if (!seq_clnp_req) {
0958         printk(KERN_ERR PFX "cleanup: couldn't allocate cmd\n");
0959         rc = -ENOMEM;
0960         kfree(cb_arg);
0961         goto cleanup_err;
0962     }
0963     /* Initialize rest of io_req fields */
0964     seq_clnp_req->sc_cmd = NULL;
0965     seq_clnp_req->port = port;
0966     seq_clnp_req->tgt = tgt;
0967     seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
0968 
0969     xid = seq_clnp_req->xid;
0970 
0971     task_idx = xid/BNX2FC_TASKS_PER_PAGE;
0972     index = xid % BNX2FC_TASKS_PER_PAGE;
0973 
0974     /* Initialize task context for this IO request */
0975     task_page = (struct fcoe_task_ctx_entry *)
0976              interface->hba->task_ctx[task_idx];
0977     task = &(task_page[index]);
0978     cb_arg->aborted_io_req = orig_io_req;
0979     cb_arg->io_req = seq_clnp_req;
0980     cb_arg->r_ctl = r_ctl;
0981     cb_arg->offset = offset;
0982     seq_clnp_req->cb_arg = cb_arg;
0983 
0984     printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
0985     bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
0986 
0987     /* Obtain free SQ entry */
0988     bnx2fc_add_2_sq(tgt, xid);
0989 
0990     /* Ring doorbell */
0991     bnx2fc_ring_doorbell(tgt);
0992 cleanup_err:
0993     return rc;
0994 }
0995 
0996 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
0997 {
0998     struct bnx2fc_rport *tgt = io_req->tgt;
0999     struct bnx2fc_interface *interface;
1000     struct fcoe_port *port;
1001     struct bnx2fc_cmd *cleanup_io_req;
1002     struct fcoe_task_ctx_entry *task;
1003     struct fcoe_task_ctx_entry *task_page;
1004     int task_idx, index;
1005     u16 xid, orig_xid;
1006     int rc = 0;
1007 
1008     /* ASSUMPTION: called with tgt_lock held */
1009     BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1010 
1011     port = io_req->port;
1012     interface = port->priv;
1013 
1014     cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1015     if (!cleanup_io_req) {
1016         printk(KERN_ERR PFX "cleanup: couldn't allocate cmd\n");
1017         rc = -1;
1018         goto cleanup_err;
1019     }
1020 
1021     /* Initialize rest of io_req fields */
1022     cleanup_io_req->sc_cmd = NULL;
1023     cleanup_io_req->port = port;
1024     cleanup_io_req->tgt = tgt;
1025     cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1026 
1027     xid = cleanup_io_req->xid;
1028 
1029     task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1030     index = xid % BNX2FC_TASKS_PER_PAGE;
1031 
1032     /* Initialize task context for this IO request */
1033     task_page = (struct fcoe_task_ctx_entry *)
1034             interface->hba->task_ctx[task_idx];
1035     task = &(task_page[index]);
1036     orig_xid = io_req->xid;
1037 
1038     BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1039 
1040     bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1041 
1042     /* Obtain free SQ entry */
1043     bnx2fc_add_2_sq(tgt, xid);
1044 
1045     /* Set flag that cleanup request is pending with the firmware */
1046     set_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1047 
1048     /* Ring doorbell */
1049     bnx2fc_ring_doorbell(tgt);
1050 
1051 cleanup_err:
1052     return rc;
1053 }
1054 
1055 /**
1056  * bnx2fc_eh_target_reset: Reset a target
1057  *
1058  * @sc_cmd: SCSI command
1059  *
1060  * Set from SCSI host template to send task mgmt command to the target
1061  *  and wait for the response
1062  */
1063 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1064 {
1065     return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1066 }
1067 
1068 /**
1069  * bnx2fc_eh_device_reset - Reset a single LUN
1070  *
1071  * @sc_cmd: SCSI command
1072  *
1073  * Set from SCSI host template to send task mgmt command to the target
1074  *  and wait for the response
1075  */
1076 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1077 {
1078     return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1079 }
1080 
1081 static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1082     __must_hold(&tgt->tgt_lock)
1083 {
1084     struct bnx2fc_rport *tgt = io_req->tgt;
1085     unsigned int time_left;
1086 
1087     init_completion(&io_req->cleanup_done);
1088     io_req->wait_for_cleanup_comp = 1;
1089     bnx2fc_initiate_cleanup(io_req);
1090 
1091     spin_unlock_bh(&tgt->tgt_lock);
1092 
1093     /*
1094      * Can't wait forever on cleanup response lest we let the SCSI error
1095      * handler wait forever
1096      */
1097     time_left = wait_for_completion_timeout(&io_req->cleanup_done,
1098                         BNX2FC_FW_TIMEOUT);
1099     if (!time_left) {
1100         BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1101                   __func__);
1102 
1103         /*
1104          * Put the extra reference to the SCSI command since it would
1105          * not have been returned in this case.
1106          */
1107         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1108     }
1109 
1110     spin_lock_bh(&tgt->tgt_lock);
1111     io_req->wait_for_cleanup_comp = 0;
1112     return SUCCESS;
1113 }
1114 
1115 /**
1116  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1117  *          SCSI command
1118  *
1119  * @sc_cmd: SCSI_ML command pointer
1120  *
1121  * SCSI abort request handler
1122  */
1123 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1124 {
1125     struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1126     struct fc_rport_libfc_priv *rp = rport->dd_data;
1127     struct bnx2fc_cmd *io_req;
1128     struct fc_lport *lport;
1129     struct bnx2fc_rport *tgt;
1130     int rc;
1131     unsigned int time_left;
1132 
1133     rc = fc_block_scsi_eh(sc_cmd);
1134     if (rc)
1135         return rc;
1136 
1137     lport = shost_priv(sc_cmd->device->host);
1138     if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1139         printk(KERN_ERR PFX "eh_abort: link not ready\n");
1140         return FAILED;
1141     }
1142 
1143     tgt = (struct bnx2fc_rport *)&rp[1];
1144 
1145     BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1146 
1147     spin_lock_bh(&tgt->tgt_lock);
1148     io_req = bnx2fc_priv(sc_cmd)->io_req;
1149     if (!io_req) {
1150         /* Command might have just completed */
1151         printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1152         spin_unlock_bh(&tgt->tgt_lock);
1153         return SUCCESS;
1154     }
1155     BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1156               kref_read(&io_req->refcount));
1157 
1158     /* Hold IO request across abort processing */
1159     kref_get(&io_req->refcount);
1160 
1161     BUG_ON(tgt != io_req->tgt);
1162 
1163     /* Remove the io_req from the active_q. */
1164     /*
1165      * Task Mgmt functions (LUN RESET & TGT RESET) will not
1166      * issue an ABTS on this particular IO req, as the
1167      * io_req is no longer in the active_q.
1168      */
1169     if (tgt->flush_in_prog) {
1170         printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1171             "flush in progress\n", io_req->xid);
1172         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1173         spin_unlock_bh(&tgt->tgt_lock);
1174         return SUCCESS;
1175     }
1176 
1177     if (io_req->on_active_queue == 0) {
1178         printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1179                 "not on active_q\n", io_req->xid);
1180         /*
1181          * The IO is still with the FW.
1182          * Return failure and let SCSI-ml retry eh_abort.
1183          */
1184         spin_unlock_bh(&tgt->tgt_lock);
1185         return FAILED;
1186     }
1187 
1188     /*
1189      * Only eh_abort processing will remove the IO from
1190      * active_cmd_q before processing the request. this is
1191      * done to avoid race conditions between IOs aborted
1192      * as part of task management completion and eh_abort
1193      * processing
1194      */
1195     list_del_init(&io_req->link);
1196     io_req->on_active_queue = 0;
1197     /* Move IO req to retire queue */
1198     list_add_tail(&io_req->link, &tgt->io_retire_queue);
1199 
1200     init_completion(&io_req->abts_done);
1201     init_completion(&io_req->cleanup_done);
1202 
1203     if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1204         printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1205                 "already in abts processing\n", io_req->xid);
1206         if (cancel_delayed_work(&io_req->timeout_work))
1207             kref_put(&io_req->refcount,
1208                  bnx2fc_cmd_release); /* drop timer hold */
1209         /*
1210          * We don't want to hold off the upper layer timer so simply
1211          * cleanup the command and return that I/O was successfully
1212          * aborted.
1213          */
1214         bnx2fc_abts_cleanup(io_req);
1215         /* This only occurs when an task abort was requested while ABTS
1216            is in progress.  Setting the IO_CLEANUP flag will skip the
1217            RRQ process in the case when the fw generated SCSI_CMD cmpl
1218            was a result from the ABTS request rather than the CLEANUP
1219            request */
1220         set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1221         rc = FAILED;
1222         goto done;
1223     }
1224 
1225     /* Cancel the current timer running on this io_req */
1226     if (cancel_delayed_work(&io_req->timeout_work))
1227         kref_put(&io_req->refcount,
1228              bnx2fc_cmd_release); /* drop timer hold */
1229     set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1230     io_req->wait_for_abts_comp = 1;
1231     rc = bnx2fc_initiate_abts(io_req);
1232     if (rc == FAILED) {
1233         io_req->wait_for_cleanup_comp = 1;
1234         bnx2fc_initiate_cleanup(io_req);
1235         spin_unlock_bh(&tgt->tgt_lock);
1236         wait_for_completion(&io_req->cleanup_done);
1237         spin_lock_bh(&tgt->tgt_lock);
1238         io_req->wait_for_cleanup_comp = 0;
1239         goto done;
1240     }
1241     spin_unlock_bh(&tgt->tgt_lock);
1242 
1243     /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1244     time_left = wait_for_completion_timeout(&io_req->abts_done,
1245                     msecs_to_jiffies(2 * rp->r_a_tov + 1));
1246     if (time_left)
1247         BNX2FC_IO_DBG(io_req,
1248                   "Timed out in eh_abort waiting for abts_done");
1249 
1250     spin_lock_bh(&tgt->tgt_lock);
1251     io_req->wait_for_abts_comp = 0;
1252     if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1253         BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1254         rc = SUCCESS;
1255     } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1256                       &io_req->req_flags))) {
1257         /* Let the scsi-ml try to recover this command */
1258         printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1259                io_req->xid);
1260         /*
1261          * Cleanup firmware residuals before returning control back
1262          * to SCSI ML.
1263          */
1264         rc = bnx2fc_abts_cleanup(io_req);
1265         goto done;
1266     } else {
1267         /*
1268          * We come here even when there was a race condition
1269          * between timeout and abts completion, and abts
1270          * completion happens just in time.
1271          */
1272         BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1273         rc = SUCCESS;
1274         bnx2fc_scsi_done(io_req, DID_ABORT);
1275         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1276     }
1277 done:
1278     /* release the reference taken in eh_abort */
1279     kref_put(&io_req->refcount, bnx2fc_cmd_release);
1280     spin_unlock_bh(&tgt->tgt_lock);
1281     return rc;
1282 }
1283 
1284 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1285                       struct fcoe_task_ctx_entry *task,
1286                       u8 rx_state)
1287 {
1288     struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1289     struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1290     u32 offset = cb_arg->offset;
1291     enum fc_rctl r_ctl = cb_arg->r_ctl;
1292     int rc = 0;
1293     struct bnx2fc_rport *tgt = orig_io_req->tgt;
1294 
1295     BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1296                   "cmd_type = %d\n",
1297            seq_clnp_req->xid, seq_clnp_req->cmd_type);
1298 
1299     if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1300         printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1301             seq_clnp_req->xid);
1302         goto free_cb_arg;
1303     }
1304 
1305     spin_unlock_bh(&tgt->tgt_lock);
1306     rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1307     spin_lock_bh(&tgt->tgt_lock);
1308 
1309     if (rc)
1310         printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1311             " IO will abort\n");
1312     seq_clnp_req->cb_arg = NULL;
1313     kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1314 free_cb_arg:
1315     kfree(cb_arg);
1316     return;
1317 }
1318 
1319 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1320                   struct fcoe_task_ctx_entry *task,
1321                   u8 num_rq)
1322 {
1323     BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1324                   "refcnt = %d, cmd_type = %d\n",
1325            kref_read(&io_req->refcount), io_req->cmd_type);
1326     /*
1327      * Test whether there is a cleanup request pending. If not just
1328      * exit.
1329      */
1330     if (!test_and_clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ,
1331                 &io_req->req_flags))
1332         return;
1333     /*
1334      * If we receive a cleanup completion for this request then the
1335      * firmware will not give us an abort completion for this request
1336      * so clear any ABTS pending flags.
1337      */
1338     if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags) &&
1339         !test_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags)) {
1340         set_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags);
1341         if (io_req->wait_for_abts_comp)
1342             complete(&io_req->abts_done);
1343     }
1344 
1345     bnx2fc_scsi_done(io_req, DID_ERROR);
1346     kref_put(&io_req->refcount, bnx2fc_cmd_release);
1347     if (io_req->wait_for_cleanup_comp)
1348         complete(&io_req->cleanup_done);
1349 }
1350 
1351 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1352                    struct fcoe_task_ctx_entry *task,
1353                    u8 num_rq)
1354 {
1355     u32 r_ctl;
1356     u32 r_a_tov = FC_DEF_R_A_TOV;
1357     u8 issue_rrq = 0;
1358     struct bnx2fc_rport *tgt = io_req->tgt;
1359 
1360     BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1361                   "refcnt = %d, cmd_type = %d\n",
1362            io_req->xid,
1363            kref_read(&io_req->refcount), io_req->cmd_type);
1364 
1365     if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1366                        &io_req->req_flags)) {
1367         BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1368                 " this io\n");
1369         return;
1370     }
1371 
1372     /*
1373      * If we receive an ABTS completion here then we will not receive
1374      * a cleanup completion so clear any cleanup pending flags.
1375      */
1376     if (test_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags)) {
1377         clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1378         if (io_req->wait_for_cleanup_comp)
1379             complete(&io_req->cleanup_done);
1380     }
1381 
1382     /* Do not issue RRQ as this IO is already cleanedup */
1383     if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1384                 &io_req->req_flags))
1385         goto io_compl;
1386 
1387     /*
1388      * For ABTS issued due to SCSI eh_abort_handler, timeout
1389      * values are maintained by scsi-ml itself. Cancel timeout
1390      * in case ABTS issued as part of task management function
1391      * or due to FW error.
1392      */
1393     if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1394         if (cancel_delayed_work(&io_req->timeout_work))
1395             kref_put(&io_req->refcount,
1396                  bnx2fc_cmd_release); /* drop timer hold */
1397 
1398     r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1399 
1400     switch (r_ctl) {
1401     case FC_RCTL_BA_ACC:
1402         /*
1403          * Dont release this cmd yet. It will be relesed
1404          * after we get RRQ response
1405          */
1406         BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1407         issue_rrq = 1;
1408         break;
1409 
1410     case FC_RCTL_BA_RJT:
1411         BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1412         break;
1413     default:
1414         printk(KERN_ERR PFX "Unknown ABTS response\n");
1415         break;
1416     }
1417 
1418     if (issue_rrq) {
1419         BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1420         set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1421     }
1422     set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1423     bnx2fc_cmd_timer_set(io_req, r_a_tov);
1424 
1425 io_compl:
1426     if (io_req->wait_for_abts_comp) {
1427         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1428                        &io_req->req_flags))
1429             complete(&io_req->abts_done);
1430     } else {
1431         /*
1432          * We end up here when ABTS is issued as
1433          * in asynchronous context, i.e., as part
1434          * of task management completion, or
1435          * when FW error is received or when the
1436          * ABTS is issued when the IO is timed
1437          * out.
1438          */
1439 
1440         if (io_req->on_active_queue) {
1441             list_del_init(&io_req->link);
1442             io_req->on_active_queue = 0;
1443             /* Move IO req to retire queue */
1444             list_add_tail(&io_req->link, &tgt->io_retire_queue);
1445         }
1446         bnx2fc_scsi_done(io_req, DID_ERROR);
1447         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1448     }
1449 }
1450 
1451 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1452 {
1453     struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1454     struct bnx2fc_rport *tgt = io_req->tgt;
1455     struct bnx2fc_cmd *cmd, *tmp;
1456     u64 tm_lun = sc_cmd->device->lun;
1457     u64 lun;
1458     int rc = 0;
1459 
1460     /* called with tgt_lock held */
1461     BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1462     /*
1463      * Walk thru the active_ios queue and ABORT the IO
1464      * that matches with the LUN that was reset
1465      */
1466     list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1467         BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1468         lun = cmd->sc_cmd->device->lun;
1469         if (lun == tm_lun) {
1470             /* Initiate ABTS on this cmd */
1471             if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1472                           &cmd->req_flags)) {
1473                 /* cancel the IO timeout */
1474                 if (cancel_delayed_work(&io_req->timeout_work))
1475                     kref_put(&io_req->refcount,
1476                          bnx2fc_cmd_release);
1477                             /* timer hold */
1478                 rc = bnx2fc_initiate_abts(cmd);
1479                 /* abts shouldn't fail in this context */
1480                 WARN_ON(rc != SUCCESS);
1481             } else
1482                 printk(KERN_ERR PFX "lun_rst: abts already in"
1483                     " progress for this IO 0x%x\n",
1484                     cmd->xid);
1485         }
1486     }
1487 }
1488 
1489 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1490 {
1491     struct bnx2fc_rport *tgt = io_req->tgt;
1492     struct bnx2fc_cmd *cmd, *tmp;
1493     int rc = 0;
1494 
1495     /* called with tgt_lock held */
1496     BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1497     /*
1498      * Walk thru the active_ios queue and ABORT the IO
1499      * that matches with the LUN that was reset
1500      */
1501     list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1502         BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1503         /* Initiate ABTS */
1504         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1505                             &cmd->req_flags)) {
1506             /* cancel the IO timeout */
1507             if (cancel_delayed_work(&io_req->timeout_work))
1508                 kref_put(&io_req->refcount,
1509                      bnx2fc_cmd_release); /* timer hold */
1510             rc = bnx2fc_initiate_abts(cmd);
1511             /* abts shouldn't fail in this context */
1512             WARN_ON(rc != SUCCESS);
1513 
1514         } else
1515             printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1516                 " for this IO 0x%x\n", cmd->xid);
1517     }
1518 }
1519 
1520 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1521                  struct fcoe_task_ctx_entry *task, u8 num_rq,
1522                   unsigned char *rq_data)
1523 {
1524     struct bnx2fc_mp_req *tm_req;
1525     struct fc_frame_header *fc_hdr;
1526     struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1527     u64 *hdr;
1528     u64 *temp_hdr;
1529     void *rsp_buf;
1530 
1531     /* Called with tgt_lock held */
1532     BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1533 
1534     if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1535         set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1536     else {
1537         /* TM has already timed out and we got
1538          * delayed completion. Ignore completion
1539          * processing.
1540          */
1541         return;
1542     }
1543 
1544     tm_req = &(io_req->mp_req);
1545     fc_hdr = &(tm_req->resp_fc_hdr);
1546     hdr = (u64 *)fc_hdr;
1547     temp_hdr = (u64 *)
1548         &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1549     hdr[0] = cpu_to_be64(temp_hdr[0]);
1550     hdr[1] = cpu_to_be64(temp_hdr[1]);
1551     hdr[2] = cpu_to_be64(temp_hdr[2]);
1552 
1553     tm_req->resp_len =
1554         task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1555 
1556     rsp_buf = tm_req->resp_buf;
1557 
1558     if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1559         bnx2fc_parse_fcp_rsp(io_req,
1560                      (struct fcoe_fcp_rsp_payload *)
1561                      rsp_buf, num_rq, rq_data);
1562         if (io_req->fcp_rsp_code == 0) {
1563             /* TM successful */
1564             if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1565                 bnx2fc_lun_reset_cmpl(io_req);
1566             else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1567                 bnx2fc_tgt_reset_cmpl(io_req);
1568         }
1569     } else {
1570         printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1571             fc_hdr->fh_r_ctl);
1572     }
1573     if (!bnx2fc_priv(sc_cmd)->io_req) {
1574         printk(KERN_ERR PFX "tm_compl: io_req is NULL\n");
1575         return;
1576     }
1577     switch (io_req->fcp_status) {
1578     case FC_GOOD:
1579         if (io_req->cdb_status == 0) {
1580             /* Good IO completion */
1581             sc_cmd->result = DID_OK << 16;
1582         } else {
1583             /* Transport status is good, SCSI status not good */
1584             sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1585         }
1586         if (io_req->fcp_resid)
1587             scsi_set_resid(sc_cmd, io_req->fcp_resid);
1588         break;
1589 
1590     default:
1591         BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1592                io_req->fcp_status);
1593         break;
1594     }
1595 
1596     sc_cmd = io_req->sc_cmd;
1597     io_req->sc_cmd = NULL;
1598 
1599     /* check if the io_req exists in tgt's tmf_q */
1600     if (io_req->on_tmf_queue) {
1601 
1602         list_del_init(&io_req->link);
1603         io_req->on_tmf_queue = 0;
1604     } else {
1605 
1606         printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1607         return;
1608     }
1609 
1610     bnx2fc_priv(sc_cmd)->io_req = NULL;
1611     scsi_done(sc_cmd);
1612 
1613     kref_put(&io_req->refcount, bnx2fc_cmd_release);
1614     if (io_req->wait_for_abts_comp) {
1615         BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1616         complete(&io_req->abts_done);
1617     }
1618 }
1619 
1620 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1621                int bd_index)
1622 {
1623     struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1624     int frag_size, sg_frags;
1625 
1626     sg_frags = 0;
1627     while (sg_len) {
1628         if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1629             frag_size = BNX2FC_BD_SPLIT_SZ;
1630         else
1631             frag_size = sg_len;
1632         bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1633         bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1634         bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1635         bd[bd_index + sg_frags].flags = 0;
1636 
1637         addr += (u64) frag_size;
1638         sg_frags++;
1639         sg_len -= frag_size;
1640     }
1641     return sg_frags;
1642 
1643 }
1644 
1645 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1646 {
1647     struct bnx2fc_interface *interface = io_req->port->priv;
1648     struct bnx2fc_hba *hba = interface->hba;
1649     struct scsi_cmnd *sc = io_req->sc_cmd;
1650     struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1651     struct scatterlist *sg;
1652     int byte_count = 0;
1653     int sg_count = 0;
1654     int bd_count = 0;
1655     int sg_frags;
1656     unsigned int sg_len;
1657     u64 addr;
1658     int i;
1659 
1660     WARN_ON(scsi_sg_count(sc) > BNX2FC_MAX_BDS_PER_CMD);
1661     /*
1662      * Use dma_map_sg directly to ensure we're using the correct
1663      * dev struct off of pcidev.
1664      */
1665     sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1666                   scsi_sg_count(sc), sc->sc_data_direction);
1667     scsi_for_each_sg(sc, sg, sg_count, i) {
1668         sg_len = sg_dma_len(sg);
1669         addr = sg_dma_address(sg);
1670         if (sg_len > BNX2FC_MAX_BD_LEN) {
1671             sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1672                            bd_count);
1673         } else {
1674 
1675             sg_frags = 1;
1676             bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1677             bd[bd_count].buf_addr_hi  = addr >> 32;
1678             bd[bd_count].buf_len = (u16)sg_len;
1679             bd[bd_count].flags = 0;
1680         }
1681         bd_count += sg_frags;
1682         byte_count += sg_len;
1683     }
1684     if (byte_count != scsi_bufflen(sc))
1685         printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1686             "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1687             io_req->xid);
1688     return bd_count;
1689 }
1690 
1691 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1692 {
1693     struct scsi_cmnd *sc = io_req->sc_cmd;
1694     struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1695     int bd_count;
1696 
1697     if (scsi_sg_count(sc)) {
1698         bd_count = bnx2fc_map_sg(io_req);
1699         if (bd_count == 0)
1700             return -ENOMEM;
1701     } else {
1702         bd_count = 0;
1703         bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1704         bd[0].buf_len = bd[0].flags = 0;
1705     }
1706     io_req->bd_tbl->bd_valid = bd_count;
1707 
1708     /*
1709      * Return the command to ML if BD count exceeds the max number
1710      * that can be handled by FW.
1711      */
1712     if (bd_count > BNX2FC_FW_MAX_BDS_PER_CMD) {
1713         pr_err("bd_count = %d exceeded FW supported max BD(255), task_id = 0x%x\n",
1714                bd_count, io_req->xid);
1715         return -ENOMEM;
1716     }
1717 
1718     return 0;
1719 }
1720 
1721 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1722 {
1723     struct scsi_cmnd *sc = io_req->sc_cmd;
1724     struct bnx2fc_interface *interface = io_req->port->priv;
1725     struct bnx2fc_hba *hba = interface->hba;
1726 
1727     /*
1728      * Use dma_unmap_sg directly to ensure we're using the correct
1729      * dev struct off of pcidev.
1730      */
1731     if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1732         dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1733             scsi_sg_count(sc), sc->sc_data_direction);
1734         io_req->bd_tbl->bd_valid = 0;
1735     }
1736 }
1737 
1738 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1739                   struct fcp_cmnd *fcp_cmnd)
1740 {
1741     struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1742 
1743     memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1744 
1745     int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1746 
1747     fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1748     memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1749 
1750     fcp_cmnd->fc_cmdref = 0;
1751     fcp_cmnd->fc_pri_ta = 0;
1752     fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1753     fcp_cmnd->fc_flags = io_req->io_req_flags;
1754     fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1755 }
1756 
1757 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1758                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1759                  u8 num_rq, unsigned char *rq_data)
1760 {
1761     struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1762     u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1763     u32 rq_buff_len = 0;
1764     int fcp_sns_len = 0;
1765     int fcp_rsp_len = 0;
1766 
1767     io_req->fcp_status = FC_GOOD;
1768     io_req->fcp_resid = 0;
1769     if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1770         FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1771         io_req->fcp_resid = fcp_rsp->fcp_resid;
1772 
1773     io_req->scsi_comp_flags = rsp_flags;
1774     io_req->cdb_status = fcp_rsp->scsi_status_code;
1775 
1776     /* Fetch fcp_rsp_info and fcp_sns_info if available */
1777     if (num_rq) {
1778 
1779         /*
1780          * We do not anticipate num_rq >1, as the linux defined
1781          * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1782          * 256 bytes of single rq buffer is good enough to hold this.
1783          */
1784 
1785         if (rsp_flags &
1786             FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1787             fcp_rsp_len = rq_buff_len
1788                     = fcp_rsp->fcp_rsp_len;
1789         }
1790 
1791         if (rsp_flags &
1792             FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1793             fcp_sns_len = fcp_rsp->fcp_sns_len;
1794             rq_buff_len += fcp_rsp->fcp_sns_len;
1795         }
1796 
1797         io_req->fcp_rsp_len = fcp_rsp_len;
1798         io_req->fcp_sns_len = fcp_sns_len;
1799 
1800         if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1801             /* Invalid sense sense length. */
1802             printk(KERN_ERR PFX "invalid sns length %d\n",
1803                 rq_buff_len);
1804             /* reset rq_buff_len */
1805             rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1806         }
1807 
1808         /* fetch fcp_rsp_code */
1809         if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1810             /* Only for task management function */
1811             io_req->fcp_rsp_code = rq_data[3];
1812             BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1813                 io_req->fcp_rsp_code);
1814         }
1815 
1816         /* fetch sense data */
1817         rq_data += fcp_rsp_len;
1818 
1819         if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1820             printk(KERN_ERR PFX "Truncating sense buffer\n");
1821             fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1822         }
1823 
1824         memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1825         if (fcp_sns_len)
1826             memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1827 
1828     }
1829 }
1830 
1831 /**
1832  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1833  *
1834  * @host:   The Scsi_Host the command was issued to
1835  * @sc_cmd: struct scsi_cmnd to be executed
1836  *
1837  * This is the IO strategy routine, called by SCSI-ML
1838  **/
1839 int bnx2fc_queuecommand(struct Scsi_Host *host,
1840             struct scsi_cmnd *sc_cmd)
1841 {
1842     struct fc_lport *lport = shost_priv(host);
1843     struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1844     struct fc_rport_libfc_priv *rp = rport->dd_data;
1845     struct bnx2fc_rport *tgt;
1846     struct bnx2fc_cmd *io_req;
1847     int rc = 0;
1848     int rval;
1849 
1850     rval = fc_remote_port_chkready(rport);
1851     if (rval) {
1852         sc_cmd->result = rval;
1853         scsi_done(sc_cmd);
1854         return 0;
1855     }
1856 
1857     if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1858         rc = SCSI_MLQUEUE_HOST_BUSY;
1859         goto exit_qcmd;
1860     }
1861 
1862     /* rport and tgt are allocated together, so tgt should be non-NULL */
1863     tgt = (struct bnx2fc_rport *)&rp[1];
1864 
1865     if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1866         /*
1867          * Session is not offloaded yet. Let SCSI-ml retry
1868          * the command.
1869          */
1870         rc = SCSI_MLQUEUE_TARGET_BUSY;
1871         goto exit_qcmd;
1872     }
1873     if (tgt->retry_delay_timestamp) {
1874         if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1875             tgt->retry_delay_timestamp = 0;
1876         } else {
1877             /* If retry_delay timer is active, flow off the ML */
1878             rc = SCSI_MLQUEUE_TARGET_BUSY;
1879             goto exit_qcmd;
1880         }
1881     }
1882 
1883     spin_lock_bh(&tgt->tgt_lock);
1884 
1885     io_req = bnx2fc_cmd_alloc(tgt);
1886     if (!io_req) {
1887         rc = SCSI_MLQUEUE_HOST_BUSY;
1888         goto exit_qcmd_tgtlock;
1889     }
1890     io_req->sc_cmd = sc_cmd;
1891 
1892     if (bnx2fc_post_io_req(tgt, io_req)) {
1893         printk(KERN_ERR PFX "Unable to post io_req\n");
1894         rc = SCSI_MLQUEUE_HOST_BUSY;
1895         goto exit_qcmd_tgtlock;
1896     }
1897 
1898 exit_qcmd_tgtlock:
1899     spin_unlock_bh(&tgt->tgt_lock);
1900 exit_qcmd:
1901     return rc;
1902 }
1903 
1904 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1905                    struct fcoe_task_ctx_entry *task,
1906                    u8 num_rq, unsigned char *rq_data)
1907 {
1908     struct fcoe_fcp_rsp_payload *fcp_rsp;
1909     struct bnx2fc_rport *tgt = io_req->tgt;
1910     struct scsi_cmnd *sc_cmd;
1911     u16 scope = 0, qualifier = 0;
1912 
1913     /* scsi_cmd_cmpl is called with tgt lock held */
1914 
1915     if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1916         /* we will not receive ABTS response for this IO */
1917         BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1918                "this scsi cmd\n");
1919         if (test_and_clear_bit(BNX2FC_FLAG_IO_CLEANUP,
1920                        &io_req->req_flags)) {
1921             BNX2FC_IO_DBG(io_req,
1922                       "Actual completion after cleanup request cleaning up\n");
1923             bnx2fc_process_cleanup_compl(io_req, task, num_rq);
1924         }
1925         return;
1926     }
1927 
1928     /* Cancel the timeout_work, as we received IO completion */
1929     if (cancel_delayed_work(&io_req->timeout_work))
1930         kref_put(&io_req->refcount,
1931              bnx2fc_cmd_release); /* drop timer hold */
1932 
1933     sc_cmd = io_req->sc_cmd;
1934     if (sc_cmd == NULL) {
1935         printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1936         return;
1937     }
1938 
1939     /* Fetch fcp_rsp from task context and perform cmd completion */
1940     fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1941            &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1942 
1943     /* parse fcp_rsp and obtain sense data from RQ if available */
1944     bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq, rq_data);
1945 
1946     if (!bnx2fc_priv(sc_cmd)->io_req) {
1947         printk(KERN_ERR PFX "io_req is NULL\n");
1948         return;
1949     }
1950 
1951     if (io_req->on_active_queue) {
1952         list_del_init(&io_req->link);
1953         io_req->on_active_queue = 0;
1954         /* Move IO req to retire queue */
1955         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1956     } else {
1957         /* This should not happen, but could have been pulled
1958          * by bnx2fc_flush_active_ios(), or during a race
1959          * between command abort and (late) completion.
1960          */
1961         BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1962         if (io_req->wait_for_abts_comp)
1963             if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1964                            &io_req->req_flags))
1965                 complete(&io_req->abts_done);
1966     }
1967 
1968     bnx2fc_unmap_sg_list(io_req);
1969     io_req->sc_cmd = NULL;
1970 
1971     switch (io_req->fcp_status) {
1972     case FC_GOOD:
1973         if (io_req->cdb_status == 0) {
1974             /* Good IO completion */
1975             sc_cmd->result = DID_OK << 16;
1976         } else {
1977             /* Transport status is good, SCSI status not good */
1978             BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1979                  " fcp_resid = 0x%x\n",
1980                 io_req->cdb_status, io_req->fcp_resid);
1981             sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1982 
1983             if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1984                 io_req->cdb_status == SAM_STAT_BUSY) {
1985                 /* Newer array firmware with BUSY or
1986                  * TASK_SET_FULL may return a status that needs
1987                  * the scope bits masked.
1988                  * Or a huge delay timestamp up to 27 minutes
1989                  * can result.
1990                  */
1991                 if (fcp_rsp->retry_delay_timer) {
1992                     /* Upper 2 bits */
1993                     scope = fcp_rsp->retry_delay_timer
1994                         & 0xC000;
1995                     /* Lower 14 bits */
1996                     qualifier = fcp_rsp->retry_delay_timer
1997                         & 0x3FFF;
1998                 }
1999                 if (scope > 0 && qualifier > 0 &&
2000                     qualifier <= 0x3FEF) {
2001                     /* Set the jiffies +
2002                      * retry_delay_timer * 100ms
2003                      * for the rport/tgt
2004                      */
2005                     tgt->retry_delay_timestamp = jiffies +
2006                         (qualifier * HZ / 10);
2007                 }
2008             }
2009         }
2010         if (io_req->fcp_resid)
2011             scsi_set_resid(sc_cmd, io_req->fcp_resid);
2012         break;
2013     default:
2014         printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
2015             io_req->fcp_status);
2016         break;
2017     }
2018     bnx2fc_priv(sc_cmd)->io_req = NULL;
2019     scsi_done(sc_cmd);
2020     kref_put(&io_req->refcount, bnx2fc_cmd_release);
2021 }
2022 
2023 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
2024                    struct bnx2fc_cmd *io_req)
2025 {
2026     struct fcoe_task_ctx_entry *task;
2027     struct fcoe_task_ctx_entry *task_page;
2028     struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2029     struct fcoe_port *port = tgt->port;
2030     struct bnx2fc_interface *interface = port->priv;
2031     struct bnx2fc_hba *hba = interface->hba;
2032     struct fc_lport *lport = port->lport;
2033     int task_idx, index;
2034     u16 xid;
2035 
2036     /* bnx2fc_post_io_req() is called with the tgt_lock held */
2037 
2038     /* Initialize rest of io_req fields */
2039     io_req->cmd_type = BNX2FC_SCSI_CMD;
2040     io_req->port = port;
2041     io_req->tgt = tgt;
2042     io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2043     bnx2fc_priv(sc_cmd)->io_req = io_req;
2044 
2045     if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2046         io_req->io_req_flags = BNX2FC_READ;
2047         this_cpu_inc(lport->stats->InputRequests);
2048         this_cpu_add(lport->stats->InputBytes, io_req->data_xfer_len);
2049     } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2050         io_req->io_req_flags = BNX2FC_WRITE;
2051         this_cpu_inc(lport->stats->OutputRequests);
2052         this_cpu_add(lport->stats->OutputBytes, io_req->data_xfer_len);
2053     } else {
2054         io_req->io_req_flags = 0;
2055         this_cpu_inc(lport->stats->ControlRequests);
2056     }
2057 
2058     xid = io_req->xid;
2059 
2060     /* Build buffer descriptor list for firmware from sg list */
2061     if (bnx2fc_build_bd_list_from_sg(io_req)) {
2062         printk(KERN_ERR PFX "BD list creation failed\n");
2063         kref_put(&io_req->refcount, bnx2fc_cmd_release);
2064         return -EAGAIN;
2065     }
2066 
2067     task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2068     index = xid % BNX2FC_TASKS_PER_PAGE;
2069 
2070     /* Initialize task context for this IO request */
2071     task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2072     task = &(task_page[index]);
2073     bnx2fc_init_task(io_req, task);
2074 
2075     if (tgt->flush_in_prog) {
2076         printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2077         kref_put(&io_req->refcount, bnx2fc_cmd_release);
2078         return -EAGAIN;
2079     }
2080 
2081     if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2082         printk(KERN_ERR PFX "Session not ready...post_io\n");
2083         kref_put(&io_req->refcount, bnx2fc_cmd_release);
2084         return -EAGAIN;
2085     }
2086 
2087     /* Time IO req */
2088     if (tgt->io_timeout)
2089         bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2090     /* Obtain free SQ entry */
2091     bnx2fc_add_2_sq(tgt, xid);
2092 
2093     /* Enqueue the io_req to active_cmd_queue */
2094 
2095     io_req->on_active_queue = 1;
2096     /* move io_req from pending_queue to active_queue */
2097     list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2098 
2099     /* Ring doorbell */
2100     bnx2fc_ring_doorbell(tgt);
2101     return 0;
2102 }
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