Pileus Git - ~andy/linux/blob - drivers/target/tcm_fc/tfc_cmd.c

   1 /*
   2  * Copyright (c) 2010 Cisco Systems, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 /* XXX TBD some includes may be extraneous */
  19
  20 #include <linux/module.h>
  21 #include <linux/moduleparam.h>
  22 #include <generated/utsrelease.h>
  23 #include <linux/utsname.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/kthread.h>
  27 #include <linux/types.h>
  28 #include <linux/string.h>
  29 #include <linux/configfs.h>
  30 #include <linux/ctype.h>
  31 #include <linux/hash.h>
  32 #include <asm/unaligned.h>
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_host.h>
  35 #include <scsi/scsi_device.h>
  36 #include <scsi/scsi_cmnd.h>
  37 #include <scsi/scsi_tcq.h>
  38 #include <scsi/libfc.h>
  39 #include <scsi/fc_encode.h>
  40
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_fabric.h>
  43 #include <target/target_core_configfs.h>
  44 #include <target/configfs_macros.h>
  45
  46 #include "tcm_fc.h"
  47
  48 /*
  49  * Dump cmd state for debugging.
  50  */
  51 void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
  52 {
  53         struct fc_exch *ep;
  54         struct fc_seq *sp;
  55         struct se_cmd *se_cmd;
  56         struct scatterlist *sg;
  57         int count;
  58
  59         se_cmd = &cmd->se_cmd;
  60         pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
  61                 caller, cmd, cmd->sess, cmd->seq, se_cmd);
  62         pr_debug("%s: cmd %p cdb %p\n",
  63                 caller, cmd, cmd->cdb);
  64         pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun);
  65
  66         pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
  67                 caller, cmd, se_cmd->t_data_nents,
  68                se_cmd->data_length, se_cmd->se_cmd_flags);
  69
  70         for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
  71                 pr_debug("%s: cmd %p sg %p page %p "
  72                         "len 0x%x off 0x%x\n",
  73                         caller, cmd, sg,
  74                         sg_page(sg), sg->length, sg->offset);
  75
  76         sp = cmd->seq;
  77         if (sp) {
  78                 ep = fc_seq_exch(sp);
  79                 pr_debug("%s: cmd %p sid %x did %x "
  80                         "ox_id %x rx_id %x seq_id %x e_stat %x\n",
  81                         caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
  82                         sp->id, ep->esb_stat);
  83         }
  84         print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE,
  85                 16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0);
  86 }
  87
  88 static void ft_free_cmd(struct ft_cmd *cmd)
  89 {
  90         struct fc_frame *fp;
  91         struct fc_lport *lport;
  92
  93         if (!cmd)
  94                 return;
  95         fp = cmd->req_frame;
  96         lport = fr_dev(fp);
  97         if (fr_seq(fp))
  98                 lport->tt.seq_release(fr_seq(fp));
  99         fc_frame_free(fp);
 100         ft_sess_put(cmd->sess); /* undo get from lookup at recv */
 101         kfree(cmd);
 102 }
 103
 104 void ft_release_cmd(struct se_cmd *se_cmd)
 105 {
 106         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 107
 108         ft_free_cmd(cmd);
 109 }
 110
 111 int ft_check_stop_free(struct se_cmd *se_cmd)
 112 {
 113         transport_generic_free_cmd(se_cmd, 0);
 114         return 1;
 115 }
 116
 117 /*
 118  * Send response.
 119  */
 120 int ft_queue_status(struct se_cmd *se_cmd)
 121 {
 122         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 123         struct fc_frame *fp;
 124         struct fcp_resp_with_ext *fcp;
 125         struct fc_lport *lport;
 126         struct fc_exch *ep;
 127         size_t len;
 128
 129         ft_dump_cmd(cmd, __func__);
 130         ep = fc_seq_exch(cmd->seq);
 131         lport = ep->lp;
 132         len = sizeof(*fcp) + se_cmd->scsi_sense_length;
 133         fp = fc_frame_alloc(lport, len);
 134         if (!fp) {
 135                 /* XXX shouldn't just drop it - requeue and retry? */
 136                 return 0;
 137         }
 138         fcp = fc_frame_payload_get(fp, len);
 139         memset(fcp, 0, len);
 140         fcp->resp.fr_status = se_cmd->scsi_status;
 141
 142         len = se_cmd->scsi_sense_length;
 143         if (len) {
 144                 fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
 145                 fcp->ext.fr_sns_len = htonl(len);
 146                 memcpy((fcp + 1), se_cmd->sense_buffer, len);
 147         }
 148
 149         /*
 150          * Test underflow and overflow with one mask.  Usually both are off.
 151          * Bidirectional commands are not handled yet.
 152          */
 153         if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
 154                 if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
 155                         fcp->resp.fr_flags |= FCP_RESID_OVER;
 156                 else
 157                         fcp->resp.fr_flags |= FCP_RESID_UNDER;
 158                 fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
 159         }
 160
 161         /*
 162          * Send response.
 163          */
 164         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 165         fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
 166                        FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
 167
 168         lport->tt.seq_send(lport, cmd->seq, fp);
 169         lport->tt.exch_done(cmd->seq);
 170         return 0;
 171 }
 172
 173 int ft_write_pending_status(struct se_cmd *se_cmd)
 174 {
 175         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 176
 177         return cmd->write_data_len != se_cmd->data_length;
 178 }
 179
 180 /*
 181  * Send TX_RDY (transfer ready).
 182  */
 183 int ft_write_pending(struct se_cmd *se_cmd)
 184 {
 185         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 186         struct fc_frame *fp;
 187         struct fcp_txrdy *txrdy;
 188         struct fc_lport *lport;
 189         struct fc_exch *ep;
 190         struct fc_frame_header *fh;
 191         u32 f_ctl;
 192
 193         ft_dump_cmd(cmd, __func__);
 194
 195         ep = fc_seq_exch(cmd->seq);
 196         lport = ep->lp;
 197         fp = fc_frame_alloc(lport, sizeof(*txrdy));
 198         if (!fp)
 199                 return -ENOMEM; /* Signal QUEUE_FULL */
 200
 201         txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
 202         memset(txrdy, 0, sizeof(*txrdy));
 203         txrdy->ft_burst_len = htonl(se_cmd->data_length);
 204
 205         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 206         fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
 207                        FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
 208
 209         fh = fc_frame_header_get(fp);
 210         f_ctl = ntoh24(fh->fh_f_ctl);
 211
 212         /* Only if it is 'Exchange Responder' */
 213         if (f_ctl & FC_FC_EX_CTX) {
 214                 /* Target is 'exchange responder' and sending XFER_READY
 215                  * to 'exchange initiator (initiator)'
 216                  */
 217                 if ((ep->xid <= lport->lro_xid) &&
 218                     (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
 219                         if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
 220                                 /*
 221                                  * cmd may have been broken up into multiple
 222                                  * tasks. Link their sgs together so we can
 223                                  * operate on them all at once.
 224                                  */
 225                                 transport_do_task_sg_chain(se_cmd);
 226                                 cmd->sg = se_cmd->t_tasks_sg_chained;
 227                                 cmd->sg_cnt =
 228                                         se_cmd->t_tasks_sg_chained_no;
 229                         }
 230                         if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
 231                                                             cmd->sg,
 232                                                             cmd->sg_cnt))
 233                                 cmd->was_ddp_setup = 1;
 234                 }
 235         }
 236         lport->tt.seq_send(lport, cmd->seq, fp);
 237         return 0;
 238 }
 239
 240 u32 ft_get_task_tag(struct se_cmd *se_cmd)
 241 {
 242         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 243
 244         return fc_seq_exch(cmd->seq)->rxid;
 245 }
 246
 247 int ft_get_cmd_state(struct se_cmd *se_cmd)
 248 {
 249         return 0;
 250 }
 251
 252 int ft_is_state_remove(struct se_cmd *se_cmd)
 253 {
 254         return 0;       /* XXX TBD */
 255 }
 256
 257 /*
 258  * FC sequence response handler for follow-on sequences (data) and aborts.
 259  */
 260 static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
 261 {
 262         struct ft_cmd *cmd = arg;
 263         struct fc_frame_header *fh;
 264
 265         if (IS_ERR(fp)) {
 266                 /* XXX need to find cmd if queued */
 267                 cmd->seq = NULL;
 268                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 269                 return;
 270         }
 271
 272         fh = fc_frame_header_get(fp);
 273
 274         switch (fh->fh_r_ctl) {
 275         case FC_RCTL_DD_SOL_DATA:       /* write data */
 276                 ft_recv_write_data(cmd, fp);
 277                 break;
 278         case FC_RCTL_DD_UNSOL_CTL:      /* command */
 279         case FC_RCTL_DD_SOL_CTL:        /* transfer ready */
 280         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 281         default:
 282                 pr_debug("%s: unhandled frame r_ctl %x\n",
 283                        __func__, fh->fh_r_ctl);
 284                 ft_invl_hw_context(cmd);
 285                 fc_frame_free(fp);
 286                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 287                 break;
 288         }
 289 }
 290
 291 /*
 292  * Send a FCP response including SCSI status and optional FCP rsp_code.
 293  * status is SAM_STAT_GOOD (zero) iff code is valid.
 294  * This is used in error cases, such as allocation failures.
 295  */
 296 static void ft_send_resp_status(struct fc_lport *lport,
 297                                 const struct fc_frame *rx_fp,
 298                                 u32 status, enum fcp_resp_rsp_codes code)
 299 {
 300         struct fc_frame *fp;
 301         struct fc_seq *sp;
 302         const struct fc_frame_header *fh;
 303         size_t len;
 304         struct fcp_resp_with_ext *fcp;
 305         struct fcp_resp_rsp_info *info;
 306
 307         fh = fc_frame_header_get(rx_fp);
 308         pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
 309                   ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
 310         len = sizeof(*fcp);
 311         if (status == SAM_STAT_GOOD)
 312                 len += sizeof(*info);
 313         fp = fc_frame_alloc(lport, len);
 314         if (!fp)
 315                 return;
 316         fcp = fc_frame_payload_get(fp, len);
 317         memset(fcp, 0, len);
 318         fcp->resp.fr_status = status;
 319         if (status == SAM_STAT_GOOD) {
 320                 fcp->ext.fr_rsp_len = htonl(sizeof(*info));
 321                 fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
 322                 info = (struct fcp_resp_rsp_info *)(fcp + 1);
 323                 info->rsp_code = code;
 324         }
 325
 326         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
 327         sp = fr_seq(fp);
 328         if (sp)
 329                 lport->tt.seq_send(lport, sp, fp);
 330         else
 331                 lport->tt.frame_send(lport, fp);
 332 }
 333
 334 /*
 335  * Send error or task management response.
 336  */
 337 static void ft_send_resp_code(struct ft_cmd *cmd,
 338                               enum fcp_resp_rsp_codes code)
 339 {
 340         ft_send_resp_status(cmd->sess->tport->lport,
 341                             cmd->req_frame, SAM_STAT_GOOD, code);
 342 }
 343
 344
 345 /*
 346  * Send error or task management response.
 347  * Always frees the cmd and associated state.
 348  */
 349 static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
 350                                       enum fcp_resp_rsp_codes code)
 351 {
 352         ft_send_resp_code(cmd, code);
 353         ft_free_cmd(cmd);
 354 }
 355
 356 /*
 357  * Handle Task Management Request.
 358  */
 359 static void ft_send_tm(struct ft_cmd *cmd)
 360 {
 361         struct se_tmr_req *tmr;
 362         struct fcp_cmnd *fcp;
 363         struct ft_sess *sess;
 364         u8 tm_func;
 365
 366         transport_init_se_cmd(&cmd->se_cmd, &ft_configfs->tf_ops,
 367                         cmd->sess->se_sess, 0, DMA_NONE, 0,
 368                         &cmd->ft_sense_buffer[0]);
 369         target_get_sess_cmd(cmd->sess->se_sess, &cmd->se_cmd, false);
 370
 371         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 372
 373         switch (fcp->fc_tm_flags) {
 374         case FCP_TMF_LUN_RESET:
 375                 tm_func = TMR_LUN_RESET;
 376                 break;
 377         case FCP_TMF_TGT_RESET:
 378                 tm_func = TMR_TARGET_WARM_RESET;
 379                 break;
 380         case FCP_TMF_CLR_TASK_SET:
 381                 tm_func = TMR_CLEAR_TASK_SET;
 382                 break;
 383         case FCP_TMF_ABT_TASK_SET:
 384                 tm_func = TMR_ABORT_TASK_SET;
 385                 break;
 386         case FCP_TMF_CLR_ACA:
 387                 tm_func = TMR_CLEAR_ACA;
 388                 break;
 389         default:
 390                 /*
 391                  * FCP4r01 indicates having a combination of
 392                  * tm_flags set is invalid.
 393                  */
 394                 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
 395                 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 396                 return;
 397         }
 398
 399         pr_debug("alloc tm cmd fn %d\n", tm_func);
 400         tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
 401         if (!tmr) {
 402                 pr_debug("alloc failed\n");
 403                 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
 404                 return;
 405         }
 406         cmd->se_cmd.se_tmr_req = tmr;
 407
 408         switch (fcp->fc_tm_flags) {
 409         case FCP_TMF_LUN_RESET:
 410                 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 411                 if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
 412                         /*
 413                          * Make sure to clean up newly allocated TMR request
 414                          * since "unable to  handle TMR request because failed
 415                          * to get to LUN"
 416                          */
 417                         pr_debug("Failed to get LUN for TMR func %d, "
 418                                   "se_cmd %p, unpacked_lun %d\n",
 419                                   tm_func, &cmd->se_cmd, cmd->lun);
 420                         ft_dump_cmd(cmd, __func__);
 421                         sess = cmd->sess;
 422                         transport_send_check_condition_and_sense(&cmd->se_cmd,
 423                                 cmd->se_cmd.scsi_sense_reason, 0);
 424                         ft_sess_put(sess);
 425                         return;
 426                 }
 427                 break;
 428         case FCP_TMF_TGT_RESET:
 429         case FCP_TMF_CLR_TASK_SET:
 430         case FCP_TMF_ABT_TASK_SET:
 431         case FCP_TMF_CLR_ACA:
 432                 break;
 433         default:
 434                 return;
 435         }
 436         transport_generic_handle_tmr(&cmd->se_cmd);
 437 }
 438
 439 /*
 440  * Send status from completed task management request.
 441  */
 442 int ft_queue_tm_resp(struct se_cmd *se_cmd)
 443 {
 444         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 445         struct se_tmr_req *tmr = se_cmd->se_tmr_req;
 446         enum fcp_resp_rsp_codes code;
 447
 448         switch (tmr->response) {
 449         case TMR_FUNCTION_COMPLETE:
 450                 code = FCP_TMF_CMPL;
 451                 break;
 452         case TMR_LUN_DOES_NOT_EXIST:
 453                 code = FCP_TMF_INVALID_LUN;
 454                 break;
 455         case TMR_FUNCTION_REJECTED:
 456                 code = FCP_TMF_REJECTED;
 457                 break;
 458         case TMR_TASK_DOES_NOT_EXIST:
 459         case TMR_TASK_STILL_ALLEGIANT:
 460         case TMR_TASK_FAILOVER_NOT_SUPPORTED:
 461         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
 462         case TMR_FUNCTION_AUTHORIZATION_FAILED:
 463         default:
 464                 code = FCP_TMF_FAILED;
 465                 break;
 466         }
 467         pr_debug("tmr fn %d resp %d fcp code %d\n",
 468                   tmr->function, tmr->response, code);
 469         ft_send_resp_code(cmd, code);
 470         return 0;
 471 }
 472
 473 static void ft_send_work(struct work_struct *work);
 474
 475 /*
 476  * Handle incoming FCP command.
 477  */
 478 static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
 479 {
 480         struct ft_cmd *cmd;
 481         struct fc_lport *lport = sess->tport->lport;
 482
 483         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 484         if (!cmd)
 485                 goto busy;
 486         cmd->sess = sess;
 487         cmd->seq = lport->tt.seq_assign(lport, fp);
 488         if (!cmd->seq) {
 489                 kfree(cmd);
 490                 goto busy;
 491         }
 492         cmd->req_frame = fp;            /* hold frame during cmd */
 493
 494         INIT_WORK(&cmd->work, ft_send_work);
 495         queue_work(sess->tport->tpg->workqueue, &cmd->work);
 496         return;
 497
 498 busy:
 499         pr_debug("cmd or seq allocation failure - sending BUSY\n");
 500         ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
 501         fc_frame_free(fp);
 502         ft_sess_put(sess);              /* undo get from lookup */
 503 }
 504
 505
 506 /*
 507  * Handle incoming FCP frame.
 508  * Caller has verified that the frame is type FCP.
 509  */
 510 void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
 511 {
 512         struct fc_frame_header *fh = fc_frame_header_get(fp);
 513
 514         switch (fh->fh_r_ctl) {
 515         case FC_RCTL_DD_UNSOL_CMD:      /* command */
 516                 ft_recv_cmd(sess, fp);
 517                 break;
 518         case FC_RCTL_DD_SOL_DATA:       /* write data */
 519         case FC_RCTL_DD_UNSOL_CTL:
 520         case FC_RCTL_DD_SOL_CTL:
 521         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 522         case FC_RCTL_ELS4_REQ:          /* SRR, perhaps */
 523         default:
 524                 pr_debug("%s: unhandled frame r_ctl %x\n",
 525                        __func__, fh->fh_r_ctl);
 526                 fc_frame_free(fp);
 527                 ft_sess_put(sess);      /* undo get from lookup */
 528                 break;
 529         }
 530 }
 531
 532 /*
 533  * Send new command to target.
 534  */
 535 static void ft_send_work(struct work_struct *work)
 536 {
 537         struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
 538         struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
 539         struct fcp_cmnd *fcp;
 540         int data_dir = 0;
 541         u32 data_len;
 542         int task_attr;
 543         int ret;
 544
 545         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 546         if (!fcp)
 547                 goto err;
 548
 549         if (fcp->fc_flags & FCP_CFL_LEN_MASK)
 550                 goto err;               /* not handling longer CDBs yet */
 551
 552         if (fcp->fc_tm_flags) {
 553                 task_attr = FCP_PTA_SIMPLE;
 554                 data_dir = DMA_NONE;
 555                 data_len = 0;
 556         } else {
 557                 switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
 558                 case 0:
 559                         data_dir = DMA_NONE;
 560                         break;
 561                 case FCP_CFL_RDDATA:
 562                         data_dir = DMA_FROM_DEVICE;
 563                         break;
 564                 case FCP_CFL_WRDATA:
 565                         data_dir = DMA_TO_DEVICE;
 566                         break;
 567                 case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
 568                         goto err;       /* TBD not supported by tcm_fc yet */
 569                 }
 570                 /*
 571                  * Locate the SAM Task Attr from fc_pri_ta
 572                  */
 573                 switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
 574                 case FCP_PTA_HEADQ:
 575                         task_attr = MSG_HEAD_TAG;
 576                         break;
 577                 case FCP_PTA_ORDERED:
 578                         task_attr = MSG_ORDERED_TAG;
 579                         break;
 580                 case FCP_PTA_ACA:
 581                         task_attr = MSG_ACA_TAG;
 582                         break;
 583                 case FCP_PTA_SIMPLE: /* Fallthrough */
 584                 default:
 585                         task_attr = MSG_SIMPLE_TAG;
 586                 }
 587
 588
 589                 task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
 590                 data_len = ntohl(fcp->fc_dl);
 591                 cmd->cdb = fcp->fc_cdb;
 592         }
 593         /*
 594          * Check for FCP task management flags
 595          */
 596         if (fcp->fc_tm_flags) {
 597                 ft_send_tm(cmd);
 598                 return;
 599         }
 600         fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
 601         cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 602         /*
 603          * Use a single se_cmd->cmd_kref as we expect to release se_cmd
 604          * directly from ft_check_stop_free callback in response path.
 605          */
 606         ret = target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, cmd->cdb,
 607                                 &cmd->ft_sense_buffer[0], cmd->lun, data_len,
 608                                 task_attr, data_dir, 0);
 609         pr_debug("r_ctl %x alloc target_submit_cmd %d\n", fh->fh_r_ctl, ret);
 610         if (ret < 0) {
 611                 ft_dump_cmd(cmd, __func__);
 612                 return;
 613         }
 614         return;
 615
 616 err:
 617         ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 618 }