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_transport.h>
  43 #include <target/target_core_fabric_ops.h>
  44 #include <target/target_core_device.h>
  45 #include <target/target_core_tpg.h>
  46 #include <target/target_core_configfs.h>
  47 #include <target/target_core_tmr.h>
  48 #include <target/configfs_macros.h>
  49
  50 #include "tcm_fc.h"
  51
  52 /*
  53  * Dump cmd state for debugging.
  54  */
  55 void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
  56 {
  57         struct fc_exch *ep;
  58         struct fc_seq *sp;
  59         struct se_cmd *se_cmd;
  60         struct scatterlist *sg;
  61         int count;
  62
  63         se_cmd = &cmd->se_cmd;
  64         pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
  65                 caller, cmd, cmd->sess, cmd->seq, se_cmd);
  66         pr_debug("%s: cmd %p cdb %p\n",
  67                 caller, cmd, cmd->cdb);
  68         pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun);
  69
  70         pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
  71                 caller, cmd, se_cmd->t_data_nents,
  72                se_cmd->data_length, se_cmd->se_cmd_flags);
  73
  74         for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
  75                 pr_debug("%s: cmd %p sg %p page %p "
  76                         "len 0x%x off 0x%x\n",
  77                         caller, cmd, sg,
  78                         sg_page(sg), sg->length, sg->offset);
  79
  80         sp = cmd->seq;
  81         if (sp) {
  82                 ep = fc_seq_exch(sp);
  83                 pr_debug("%s: cmd %p sid %x did %x "
  84                         "ox_id %x rx_id %x seq_id %x e_stat %x\n",
  85                         caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
  86                         sp->id, ep->esb_stat);
  87         }
  88         print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE,
  89                 16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0);
  90 }
  91
  92 static void ft_free_cmd(struct ft_cmd *cmd)
  93 {
  94         struct fc_frame *fp;
  95         struct fc_lport *lport;
  96
  97         if (!cmd)
  98                 return;
  99         fp = cmd->req_frame;
 100         lport = fr_dev(fp);
 101         if (fr_seq(fp))
 102                 lport->tt.seq_release(fr_seq(fp));
 103         fc_frame_free(fp);
 104         ft_sess_put(cmd->sess); /* undo get from lookup at recv */
 105         kfree(cmd);
 106 }
 107
 108 void ft_release_cmd(struct se_cmd *se_cmd)
 109 {
 110         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 111
 112         ft_free_cmd(cmd);
 113 }
 114
 115 int ft_check_stop_free(struct se_cmd *se_cmd)
 116 {
 117         transport_generic_free_cmd(se_cmd, 0);
 118         return 1;
 119 }
 120
 121 /*
 122  * Send response.
 123  */
 124 int ft_queue_status(struct se_cmd *se_cmd)
 125 {
 126         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 127         struct fc_frame *fp;
 128         struct fcp_resp_with_ext *fcp;
 129         struct fc_lport *lport;
 130         struct fc_exch *ep;
 131         size_t len;
 132
 133         if (cmd->aborted)
 134                 return 0;
 135         ft_dump_cmd(cmd, __func__);
 136         ep = fc_seq_exch(cmd->seq);
 137         lport = ep->lp;
 138         len = sizeof(*fcp) + se_cmd->scsi_sense_length;
 139         fp = fc_frame_alloc(lport, len);
 140         if (!fp) {
 141                 /* XXX shouldn't just drop it - requeue and retry? */
 142                 return 0;
 143         }
 144         fcp = fc_frame_payload_get(fp, len);
 145         memset(fcp, 0, len);
 146         fcp->resp.fr_status = se_cmd->scsi_status;
 147
 148         len = se_cmd->scsi_sense_length;
 149         if (len) {
 150                 fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
 151                 fcp->ext.fr_sns_len = htonl(len);
 152                 memcpy((fcp + 1), se_cmd->sense_buffer, len);
 153         }
 154
 155         /*
 156          * Test underflow and overflow with one mask.  Usually both are off.
 157          * Bidirectional commands are not handled yet.
 158          */
 159         if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
 160                 if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
 161                         fcp->resp.fr_flags |= FCP_RESID_OVER;
 162                 else
 163                         fcp->resp.fr_flags |= FCP_RESID_UNDER;
 164                 fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
 165         }
 166
 167         /*
 168          * Send response.
 169          */
 170         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 171         fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
 172                        FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
 173
 174         lport->tt.seq_send(lport, cmd->seq, fp);
 175         lport->tt.exch_done(cmd->seq);
 176         return 0;
 177 }
 178
 179 int ft_write_pending_status(struct se_cmd *se_cmd)
 180 {
 181         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 182
 183         return cmd->write_data_len != se_cmd->data_length;
 184 }
 185
 186 /*
 187  * Send TX_RDY (transfer ready).
 188  */
 189 int ft_write_pending(struct se_cmd *se_cmd)
 190 {
 191         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 192         struct fc_frame *fp;
 193         struct fcp_txrdy *txrdy;
 194         struct fc_lport *lport;
 195         struct fc_exch *ep;
 196         struct fc_frame_header *fh;
 197         u32 f_ctl;
 198
 199         ft_dump_cmd(cmd, __func__);
 200
 201         if (cmd->aborted)
 202                 return 0;
 203         ep = fc_seq_exch(cmd->seq);
 204         lport = ep->lp;
 205         fp = fc_frame_alloc(lport, sizeof(*txrdy));
 206         if (!fp)
 207                 return -ENOMEM; /* Signal QUEUE_FULL */
 208
 209         txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
 210         memset(txrdy, 0, sizeof(*txrdy));
 211         txrdy->ft_burst_len = htonl(se_cmd->data_length);
 212
 213         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 214         fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
 215                        FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
 216
 217         fh = fc_frame_header_get(fp);
 218         f_ctl = ntoh24(fh->fh_f_ctl);
 219
 220         /* Only if it is 'Exchange Responder' */
 221         if (f_ctl & FC_FC_EX_CTX) {
 222                 /* Target is 'exchange responder' and sending XFER_READY
 223                  * to 'exchange initiator (initiator)'
 224                  */
 225                 if ((ep->xid <= lport->lro_xid) &&
 226                     (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
 227                         if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
 228                                 /*
 229                                  * cmd may have been broken up into multiple
 230                                  * tasks. Link their sgs together so we can
 231                                  * operate on them all at once.
 232                                  */
 233                                 transport_do_task_sg_chain(se_cmd);
 234                                 cmd->sg = se_cmd->t_tasks_sg_chained;
 235                                 cmd->sg_cnt =
 236                                         se_cmd->t_tasks_sg_chained_no;
 237                         }
 238                         if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
 239                                                             cmd->sg,
 240                                                             cmd->sg_cnt))
 241                                 cmd->was_ddp_setup = 1;
 242                 }
 243         }
 244         lport->tt.seq_send(lport, cmd->seq, fp);
 245         return 0;
 246 }
 247
 248 u32 ft_get_task_tag(struct se_cmd *se_cmd)
 249 {
 250         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 251
 252         return fc_seq_exch(cmd->seq)->rxid;
 253 }
 254
 255 int ft_get_cmd_state(struct se_cmd *se_cmd)
 256 {
 257         return 0;
 258 }
 259
 260 int ft_is_state_remove(struct se_cmd *se_cmd)
 261 {
 262         return 0;       /* XXX TBD */
 263 }
 264
 265 /*
 266  * FC sequence response handler for follow-on sequences (data) and aborts.
 267  */
 268 static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
 269 {
 270         struct ft_cmd *cmd = arg;
 271         struct fc_frame_header *fh;
 272
 273         if (unlikely(IS_ERR(fp))) {
 274                 /* XXX need to find cmd if queued */
 275                 cmd->seq = NULL;
 276                 cmd->aborted = true;
 277                 return;
 278         }
 279
 280         fh = fc_frame_header_get(fp);
 281
 282         switch (fh->fh_r_ctl) {
 283         case FC_RCTL_DD_SOL_DATA:       /* write data */
 284                 ft_recv_write_data(cmd, fp);
 285                 break;
 286         case FC_RCTL_DD_UNSOL_CTL:      /* command */
 287         case FC_RCTL_DD_SOL_CTL:        /* transfer ready */
 288         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 289         default:
 290                 pr_debug("%s: unhandled frame r_ctl %x\n",
 291                        __func__, fh->fh_r_ctl);
 292                 ft_invl_hw_context(cmd);
 293                 fc_frame_free(fp);
 294                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 295                 break;
 296         }
 297 }
 298
 299 /*
 300  * Send a FCP response including SCSI status and optional FCP rsp_code.
 301  * status is SAM_STAT_GOOD (zero) iff code is valid.
 302  * This is used in error cases, such as allocation failures.
 303  */
 304 static void ft_send_resp_status(struct fc_lport *lport,
 305                                 const struct fc_frame *rx_fp,
 306                                 u32 status, enum fcp_resp_rsp_codes code)
 307 {
 308         struct fc_frame *fp;
 309         struct fc_seq *sp;
 310         const struct fc_frame_header *fh;
 311         size_t len;
 312         struct fcp_resp_with_ext *fcp;
 313         struct fcp_resp_rsp_info *info;
 314
 315         fh = fc_frame_header_get(rx_fp);
 316         pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
 317                   ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
 318         len = sizeof(*fcp);
 319         if (status == SAM_STAT_GOOD)
 320                 len += sizeof(*info);
 321         fp = fc_frame_alloc(lport, len);
 322         if (!fp)
 323                 return;
 324         fcp = fc_frame_payload_get(fp, len);
 325         memset(fcp, 0, len);
 326         fcp->resp.fr_status = status;
 327         if (status == SAM_STAT_GOOD) {
 328                 fcp->ext.fr_rsp_len = htonl(sizeof(*info));
 329                 fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
 330                 info = (struct fcp_resp_rsp_info *)(fcp + 1);
 331                 info->rsp_code = code;
 332         }
 333
 334         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
 335         sp = fr_seq(fp);
 336         if (sp) {
 337                 lport->tt.seq_send(lport, sp, fp);
 338                 lport->tt.exch_done(sp);
 339         } else {
 340                 lport->tt.frame_send(lport, fp);
 341         }
 342 }
 343
 344 /*
 345  * Send error or task management response.
 346  */
 347 static void ft_send_resp_code(struct ft_cmd *cmd,
 348                               enum fcp_resp_rsp_codes code)
 349 {
 350         ft_send_resp_status(cmd->sess->tport->lport,
 351                             cmd->req_frame, SAM_STAT_GOOD, code);
 352 }
 353
 354
 355 /*
 356  * Send error or task management response.
 357  * Always frees the cmd and associated state.
 358  */
 359 static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
 360                                       enum fcp_resp_rsp_codes code)
 361 {
 362         ft_send_resp_code(cmd, code);
 363         ft_free_cmd(cmd);
 364 }
 365
 366 /*
 367  * Handle Task Management Request.
 368  */
 369 static void ft_send_tm(struct ft_cmd *cmd)
 370 {
 371         struct se_tmr_req *tmr;
 372         struct fcp_cmnd *fcp;
 373         struct ft_sess *sess;
 374         u8 tm_func;
 375
 376         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 377
 378         switch (fcp->fc_tm_flags) {
 379         case FCP_TMF_LUN_RESET:
 380                 tm_func = TMR_LUN_RESET;
 381                 break;
 382         case FCP_TMF_TGT_RESET:
 383                 tm_func = TMR_TARGET_WARM_RESET;
 384                 break;
 385         case FCP_TMF_CLR_TASK_SET:
 386                 tm_func = TMR_CLEAR_TASK_SET;
 387                 break;
 388         case FCP_TMF_ABT_TASK_SET:
 389                 tm_func = TMR_ABORT_TASK_SET;
 390                 break;
 391         case FCP_TMF_CLR_ACA:
 392                 tm_func = TMR_CLEAR_ACA;
 393                 break;
 394         default:
 395                 /*
 396                  * FCP4r01 indicates having a combination of
 397                  * tm_flags set is invalid.
 398                  */
 399                 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
 400                 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 401                 return;
 402         }
 403
 404         pr_debug("alloc tm cmd fn %d\n", tm_func);
 405         tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
 406         if (!tmr) {
 407                 pr_debug("alloc failed\n");
 408                 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
 409                 return;
 410         }
 411         cmd->se_cmd.se_tmr_req = tmr;
 412
 413         switch (fcp->fc_tm_flags) {
 414         case FCP_TMF_LUN_RESET:
 415                 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 416                 if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
 417                         /*
 418                          * Make sure to clean up newly allocated TMR request
 419                          * since "unable to  handle TMR request because failed
 420                          * to get to LUN"
 421                          */
 422                         pr_debug("Failed to get LUN for TMR func %d, "
 423                                   "se_cmd %p, unpacked_lun %d\n",
 424                                   tm_func, &cmd->se_cmd, cmd->lun);
 425                         ft_dump_cmd(cmd, __func__);
 426                         sess = cmd->sess;
 427                         transport_send_check_condition_and_sense(&cmd->se_cmd,
 428                                 cmd->se_cmd.scsi_sense_reason, 0);
 429                         transport_generic_free_cmd(&cmd->se_cmd, 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 se_cmd *se_cmd;
 548         struct fcp_cmnd *fcp;
 549         int data_dir = 0;
 550         u32 data_len;
 551         int task_attr;
 552         int ret;
 553
 554         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 555         if (!fcp)
 556                 goto err;
 557
 558         if (fcp->fc_flags & FCP_CFL_LEN_MASK)
 559                 goto err;               /* not handling longer CDBs yet */
 560
 561         if (fcp->fc_tm_flags) {
 562                 task_attr = FCP_PTA_SIMPLE;
 563                 data_dir = DMA_NONE;
 564                 data_len = 0;
 565         } else {
 566                 switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
 567                 case 0:
 568                         data_dir = DMA_NONE;
 569                         break;
 570                 case FCP_CFL_RDDATA:
 571                         data_dir = DMA_FROM_DEVICE;
 572                         break;
 573                 case FCP_CFL_WRDATA:
 574                         data_dir = DMA_TO_DEVICE;
 575                         break;
 576                 case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
 577                         goto err;       /* TBD not supported by tcm_fc yet */
 578                 }
 579                 /*
 580                  * Locate the SAM Task Attr from fc_pri_ta
 581                  */
 582                 switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
 583                 case FCP_PTA_HEADQ:
 584                         task_attr = MSG_HEAD_TAG;
 585                         break;
 586                 case FCP_PTA_ORDERED:
 587                         task_attr = MSG_ORDERED_TAG;
 588                         break;
 589                 case FCP_PTA_ACA:
 590                         task_attr = MSG_ACA_TAG;
 591                         break;
 592                 case FCP_PTA_SIMPLE: /* Fallthrough */
 593                 default:
 594                         task_attr = MSG_SIMPLE_TAG;
 595                 }
 596
 597
 598                 task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
 599                 data_len = ntohl(fcp->fc_dl);
 600                 cmd->cdb = fcp->fc_cdb;
 601         }
 602
 603         se_cmd = &cmd->se_cmd;
 604         /*
 605          * Initialize struct se_cmd descriptor from target_core_mod
 606          * infrastructure
 607          */
 608         transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
 609                               data_len, data_dir, task_attr,
 610                               &cmd->ft_sense_buffer[0]);
 611         /*
 612          * Check for FCP task management flags
 613          */
 614         if (fcp->fc_tm_flags) {
 615                 ft_send_tm(cmd);
 616                 return;
 617         }
 618
 619         fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
 620
 621         cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 622         ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun);
 623         if (ret < 0) {
 624                 ft_dump_cmd(cmd, __func__);
 625                 transport_send_check_condition_and_sense(&cmd->se_cmd,
 626                         cmd->se_cmd.scsi_sense_reason, 0);
 627                 return;
 628         }
 629
 630         ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
 631
 632         pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
 633         ft_dump_cmd(cmd, __func__);
 634
 635         if (ret == -ENOMEM) {
 636                 transport_send_check_condition_and_sense(se_cmd,
 637                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
 638                 transport_generic_free_cmd(se_cmd, 0);
 639                 return;
 640         }
 641         if (ret == -EINVAL) {
 642                 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
 643                         ft_queue_status(se_cmd);
 644                 else
 645                         transport_send_check_condition_and_sense(se_cmd,
 646                                         se_cmd->scsi_sense_reason, 0);
 647                 transport_generic_free_cmd(se_cmd, 0);
 648                 return;
 649         }
 650         transport_handle_cdb_direct(se_cmd);
 651         return;
 652
 653 err:
 654         ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 655 }