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         if (cmd->aborted)
 130                 return 0;
 131         ft_dump_cmd(cmd, __func__);
 132         ep = fc_seq_exch(cmd->seq);
 133         lport = ep->lp;
 134         len = sizeof(*fcp) + se_cmd->scsi_sense_length;
 135         fp = fc_frame_alloc(lport, len);
 136         if (!fp) {
 137                 /* XXX shouldn't just drop it - requeue and retry? */
 138                 return 0;
 139         }
 140         fcp = fc_frame_payload_get(fp, len);
 141         memset(fcp, 0, len);
 142         fcp->resp.fr_status = se_cmd->scsi_status;
 143
 144         len = se_cmd->scsi_sense_length;
 145         if (len) {
 146                 fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
 147                 fcp->ext.fr_sns_len = htonl(len);
 148                 memcpy((fcp + 1), se_cmd->sense_buffer, len);
 149         }
 150
 151         /*
 152          * Test underflow and overflow with one mask.  Usually both are off.
 153          * Bidirectional commands are not handled yet.
 154          */
 155         if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
 156                 if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
 157                         fcp->resp.fr_flags |= FCP_RESID_OVER;
 158                 else
 159                         fcp->resp.fr_flags |= FCP_RESID_UNDER;
 160                 fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
 161         }
 162
 163         /*
 164          * Send response.
 165          */
 166         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 167         fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
 168                        FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
 169
 170         lport->tt.seq_send(lport, cmd->seq, fp);
 171         lport->tt.exch_done(cmd->seq);
 172         return 0;
 173 }
 174
 175 int ft_write_pending_status(struct se_cmd *se_cmd)
 176 {
 177         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 178
 179         return cmd->write_data_len != se_cmd->data_length;
 180 }
 181
 182 /*
 183  * Send TX_RDY (transfer ready).
 184  */
 185 int ft_write_pending(struct se_cmd *se_cmd)
 186 {
 187         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 188         struct fc_frame *fp;
 189         struct fcp_txrdy *txrdy;
 190         struct fc_lport *lport;
 191         struct fc_exch *ep;
 192         struct fc_frame_header *fh;
 193         u32 f_ctl;
 194
 195         ft_dump_cmd(cmd, __func__);
 196
 197         if (cmd->aborted)
 198                 return 0;
 199         ep = fc_seq_exch(cmd->seq);
 200         lport = ep->lp;
 201         fp = fc_frame_alloc(lport, sizeof(*txrdy));
 202         if (!fp)
 203                 return -ENOMEM; /* Signal QUEUE_FULL */
 204
 205         txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
 206         memset(txrdy, 0, sizeof(*txrdy));
 207         txrdy->ft_burst_len = htonl(se_cmd->data_length);
 208
 209         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 210         fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
 211                        FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
 212
 213         fh = fc_frame_header_get(fp);
 214         f_ctl = ntoh24(fh->fh_f_ctl);
 215
 216         /* Only if it is 'Exchange Responder' */
 217         if (f_ctl & FC_FC_EX_CTX) {
 218                 /* Target is 'exchange responder' and sending XFER_READY
 219                  * to 'exchange initiator (initiator)'
 220                  */
 221                 if ((ep->xid <= lport->lro_xid) &&
 222                     (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
 223                         if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
 224                                 /*
 225                                  * cmd may have been broken up into multiple
 226                                  * tasks. Link their sgs together so we can
 227                                  * operate on them all at once.
 228                                  */
 229                                 transport_do_task_sg_chain(se_cmd);
 230                                 cmd->sg = se_cmd->t_tasks_sg_chained;
 231                                 cmd->sg_cnt =
 232                                         se_cmd->t_tasks_sg_chained_no;
 233                         }
 234                         if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
 235                                                             cmd->sg,
 236                                                             cmd->sg_cnt))
 237                                 cmd->was_ddp_setup = 1;
 238                 }
 239         }
 240         lport->tt.seq_send(lport, cmd->seq, fp);
 241         return 0;
 242 }
 243
 244 u32 ft_get_task_tag(struct se_cmd *se_cmd)
 245 {
 246         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 247
 248         return fc_seq_exch(cmd->seq)->rxid;
 249 }
 250
 251 int ft_get_cmd_state(struct se_cmd *se_cmd)
 252 {
 253         return 0;
 254 }
 255
 256 int ft_is_state_remove(struct se_cmd *se_cmd)
 257 {
 258         return 0;       /* XXX TBD */
 259 }
 260
 261 /*
 262  * FC sequence response handler for follow-on sequences (data) and aborts.
 263  */
 264 static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
 265 {
 266         struct ft_cmd *cmd = arg;
 267         struct fc_frame_header *fh;
 268
 269         if (unlikely(IS_ERR(fp))) {
 270                 /* XXX need to find cmd if queued */
 271                 cmd->seq = NULL;
 272                 cmd->aborted = true;
 273                 return;
 274         }
 275
 276         fh = fc_frame_header_get(fp);
 277
 278         switch (fh->fh_r_ctl) {
 279         case FC_RCTL_DD_SOL_DATA:       /* write data */
 280                 ft_recv_write_data(cmd, fp);
 281                 break;
 282         case FC_RCTL_DD_UNSOL_CTL:      /* command */
 283         case FC_RCTL_DD_SOL_CTL:        /* transfer ready */
 284         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 285         default:
 286                 pr_debug("%s: unhandled frame r_ctl %x\n",
 287                        __func__, fh->fh_r_ctl);
 288                 ft_invl_hw_context(cmd);
 289                 fc_frame_free(fp);
 290                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 291                 break;
 292         }
 293 }
 294
 295 /*
 296  * Send a FCP response including SCSI status and optional FCP rsp_code.
 297  * status is SAM_STAT_GOOD (zero) iff code is valid.
 298  * This is used in error cases, such as allocation failures.
 299  */
 300 static void ft_send_resp_status(struct fc_lport *lport,
 301                                 const struct fc_frame *rx_fp,
 302                                 u32 status, enum fcp_resp_rsp_codes code)
 303 {
 304         struct fc_frame *fp;
 305         struct fc_seq *sp;
 306         const struct fc_frame_header *fh;
 307         size_t len;
 308         struct fcp_resp_with_ext *fcp;
 309         struct fcp_resp_rsp_info *info;
 310
 311         fh = fc_frame_header_get(rx_fp);
 312         pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
 313                   ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
 314         len = sizeof(*fcp);
 315         if (status == SAM_STAT_GOOD)
 316                 len += sizeof(*info);
 317         fp = fc_frame_alloc(lport, len);
 318         if (!fp)
 319                 return;
 320         fcp = fc_frame_payload_get(fp, len);
 321         memset(fcp, 0, len);
 322         fcp->resp.fr_status = status;
 323         if (status == SAM_STAT_GOOD) {
 324                 fcp->ext.fr_rsp_len = htonl(sizeof(*info));
 325                 fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
 326                 info = (struct fcp_resp_rsp_info *)(fcp + 1);
 327                 info->rsp_code = code;
 328         }
 329
 330         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
 331         sp = fr_seq(fp);
 332         if (sp) {
 333                 lport->tt.seq_send(lport, sp, fp);
 334                 lport->tt.exch_done(sp);
 335         } else {
 336                 lport->tt.frame_send(lport, fp);
 337         }
 338 }
 339
 340 /*
 341  * Send error or task management response.
 342  */
 343 static void ft_send_resp_code(struct ft_cmd *cmd,
 344                               enum fcp_resp_rsp_codes code)
 345 {
 346         ft_send_resp_status(cmd->sess->tport->lport,
 347                             cmd->req_frame, SAM_STAT_GOOD, code);
 348 }
 349
 350
 351 /*
 352  * Send error or task management response.
 353  * Always frees the cmd and associated state.
 354  */
 355 static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
 356                                       enum fcp_resp_rsp_codes code)
 357 {
 358         ft_send_resp_code(cmd, code);
 359         ft_free_cmd(cmd);
 360 }
 361
 362 /*
 363  * Handle Task Management Request.
 364  */
 365 static void ft_send_tm(struct ft_cmd *cmd)
 366 {
 367         struct se_tmr_req *tmr;
 368         struct fcp_cmnd *fcp;
 369         struct ft_sess *sess;
 370         u8 tm_func;
 371
 372         transport_init_se_cmd(&cmd->se_cmd, &ft_configfs->tf_ops,
 373                         cmd->sess->se_sess, 0, DMA_NONE, 0,
 374                         &cmd->ft_sense_buffer[0]);
 375         target_get_sess_cmd(cmd->sess->se_sess, &cmd->se_cmd, false);
 376
 377         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 378
 379         switch (fcp->fc_tm_flags) {
 380         case FCP_TMF_LUN_RESET:
 381                 tm_func = TMR_LUN_RESET;
 382                 break;
 383         case FCP_TMF_TGT_RESET:
 384                 tm_func = TMR_TARGET_WARM_RESET;
 385                 break;
 386         case FCP_TMF_CLR_TASK_SET:
 387                 tm_func = TMR_CLEAR_TASK_SET;
 388                 break;
 389         case FCP_TMF_ABT_TASK_SET:
 390                 tm_func = TMR_ABORT_TASK_SET;
 391                 break;
 392         case FCP_TMF_CLR_ACA:
 393                 tm_func = TMR_CLEAR_ACA;
 394                 break;
 395         default:
 396                 /*
 397                  * FCP4r01 indicates having a combination of
 398                  * tm_flags set is invalid.
 399                  */
 400                 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
 401                 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 402                 return;
 403         }
 404
 405         pr_debug("alloc tm cmd fn %d\n", tm_func);
 406         tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
 407         if (!tmr) {
 408                 pr_debug("alloc failed\n");
 409                 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
 410                 return;
 411         }
 412         cmd->se_cmd.se_tmr_req = tmr;
 413
 414         switch (fcp->fc_tm_flags) {
 415         case FCP_TMF_LUN_RESET:
 416                 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 417                 if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
 418                         /*
 419                          * Make sure to clean up newly allocated TMR request
 420                          * since "unable to  handle TMR request because failed
 421                          * to get to LUN"
 422                          */
 423                         pr_debug("Failed to get LUN for TMR func %d, "
 424                                   "se_cmd %p, unpacked_lun %d\n",
 425                                   tm_func, &cmd->se_cmd, cmd->lun);
 426                         ft_dump_cmd(cmd, __func__);
 427                         sess = cmd->sess;
 428                         transport_send_check_condition_and_sense(&cmd->se_cmd,
 429                                 cmd->se_cmd.scsi_sense_reason, 0);
 430                         ft_sess_put(sess);
 431                         return;
 432                 }
 433                 break;
 434         case FCP_TMF_TGT_RESET:
 435         case FCP_TMF_CLR_TASK_SET:
 436         case FCP_TMF_ABT_TASK_SET:
 437         case FCP_TMF_CLR_ACA:
 438                 break;
 439         default:
 440                 return;
 441         }
 442         transport_generic_handle_tmr(&cmd->se_cmd);
 443 }
 444
 445 /*
 446  * Send status from completed task management request.
 447  */
 448 int ft_queue_tm_resp(struct se_cmd *se_cmd)
 449 {
 450         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 451         struct se_tmr_req *tmr = se_cmd->se_tmr_req;
 452         enum fcp_resp_rsp_codes code;
 453
 454         if (cmd->aborted)
 455                 return 0;
 456         switch (tmr->response) {
 457         case TMR_FUNCTION_COMPLETE:
 458                 code = FCP_TMF_CMPL;
 459                 break;
 460         case TMR_LUN_DOES_NOT_EXIST:
 461                 code = FCP_TMF_INVALID_LUN;
 462                 break;
 463         case TMR_FUNCTION_REJECTED:
 464                 code = FCP_TMF_REJECTED;
 465                 break;
 466         case TMR_TASK_DOES_NOT_EXIST:
 467         case TMR_TASK_STILL_ALLEGIANT:
 468         case TMR_TASK_FAILOVER_NOT_SUPPORTED:
 469         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
 470         case TMR_FUNCTION_AUTHORIZATION_FAILED:
 471         default:
 472                 code = FCP_TMF_FAILED;
 473                 break;
 474         }
 475         pr_debug("tmr fn %d resp %d fcp code %d\n",
 476                   tmr->function, tmr->response, code);
 477         ft_send_resp_code(cmd, code);
 478         return 0;
 479 }
 480
 481 static void ft_send_work(struct work_struct *work);
 482
 483 /*
 484  * Handle incoming FCP command.
 485  */
 486 static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
 487 {
 488         struct ft_cmd *cmd;
 489         struct fc_lport *lport = sess->tport->lport;
 490
 491         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 492         if (!cmd)
 493                 goto busy;
 494         cmd->sess = sess;
 495         cmd->seq = lport->tt.seq_assign(lport, fp);
 496         if (!cmd->seq) {
 497                 kfree(cmd);
 498                 goto busy;
 499         }
 500         cmd->req_frame = fp;            /* hold frame during cmd */
 501
 502         INIT_WORK(&cmd->work, ft_send_work);
 503         queue_work(sess->tport->tpg->workqueue, &cmd->work);
 504         return;
 505
 506 busy:
 507         pr_debug("cmd or seq allocation failure - sending BUSY\n");
 508         ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
 509         fc_frame_free(fp);
 510         ft_sess_put(sess);              /* undo get from lookup */
 511 }
 512
 513
 514 /*
 515  * Handle incoming FCP frame.
 516  * Caller has verified that the frame is type FCP.
 517  */
 518 void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
 519 {
 520         struct fc_frame_header *fh = fc_frame_header_get(fp);
 521
 522         switch (fh->fh_r_ctl) {
 523         case FC_RCTL_DD_UNSOL_CMD:      /* command */
 524                 ft_recv_cmd(sess, fp);
 525                 break;
 526         case FC_RCTL_DD_SOL_DATA:       /* write data */
 527         case FC_RCTL_DD_UNSOL_CTL:
 528         case FC_RCTL_DD_SOL_CTL:
 529         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 530         case FC_RCTL_ELS4_REQ:          /* SRR, perhaps */
 531         default:
 532                 pr_debug("%s: unhandled frame r_ctl %x\n",
 533                        __func__, fh->fh_r_ctl);
 534                 fc_frame_free(fp);
 535                 ft_sess_put(sess);      /* undo get from lookup */
 536                 break;
 537         }
 538 }
 539
 540 /*
 541  * Send new command to target.
 542  */
 543 static void ft_send_work(struct work_struct *work)
 544 {
 545         struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
 546         struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
 547         struct fcp_cmnd *fcp;
 548         int data_dir = 0;
 549         u32 data_len;
 550         int task_attr;
 551
 552         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 553         if (!fcp)
 554                 goto err;
 555
 556         if (fcp->fc_flags & FCP_CFL_LEN_MASK)
 557                 goto err;               /* not handling longer CDBs yet */
 558
 559         if (fcp->fc_tm_flags) {
 560                 task_attr = FCP_PTA_SIMPLE;
 561                 data_dir = DMA_NONE;
 562                 data_len = 0;
 563         } else {
 564                 switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
 565                 case 0:
 566                         data_dir = DMA_NONE;
 567                         break;
 568                 case FCP_CFL_RDDATA:
 569                         data_dir = DMA_FROM_DEVICE;
 570                         break;
 571                 case FCP_CFL_WRDATA:
 572                         data_dir = DMA_TO_DEVICE;
 573                         break;
 574                 case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
 575                         goto err;       /* TBD not supported by tcm_fc yet */
 576                 }
 577                 /*
 578                  * Locate the SAM Task Attr from fc_pri_ta
 579                  */
 580                 switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
 581                 case FCP_PTA_HEADQ:
 582                         task_attr = MSG_HEAD_TAG;
 583                         break;
 584                 case FCP_PTA_ORDERED:
 585                         task_attr = MSG_ORDERED_TAG;
 586                         break;
 587                 case FCP_PTA_ACA:
 588                         task_attr = MSG_ACA_TAG;
 589                         break;
 590                 case FCP_PTA_SIMPLE: /* Fallthrough */
 591                 default:
 592                         task_attr = MSG_SIMPLE_TAG;
 593                 }
 594
 595
 596                 task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
 597                 data_len = ntohl(fcp->fc_dl);
 598                 cmd->cdb = fcp->fc_cdb;
 599         }
 600         /*
 601          * Check for FCP task management flags
 602          */
 603         if (fcp->fc_tm_flags) {
 604                 ft_send_tm(cmd);
 605                 return;
 606         }
 607         fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
 608         cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 609         /*
 610          * Use a single se_cmd->cmd_kref as we expect to release se_cmd
 611          * directly from ft_check_stop_free callback in response path.
 612          */
 613         target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, cmd->cdb,
 614                                 &cmd->ft_sense_buffer[0], cmd->lun, data_len,
 615                                 task_attr, data_dir, 0);
 616         pr_debug("r_ctl %x alloc target_submit_cmd\n", fh->fh_r_ctl);
 617         return;
 618
 619 err:
 620         ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 621 }