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 <linux/version.h>
  23 #include <generated/utsrelease.h>
  24 #include <linux/utsname.h>
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/kthread.h>
  28 #include <linux/types.h>
  29 #include <linux/string.h>
  30 #include <linux/configfs.h>
  31 #include <linux/ctype.h>
  32 #include <linux/hash.h>
  33 #include <asm/unaligned.h>
  34 #include <scsi/scsi.h>
  35 #include <scsi/scsi_host.h>
  36 #include <scsi/scsi_device.h>
  37 #include <scsi/scsi_cmnd.h>
  38 #include <scsi/scsi_tcq.h>
  39 #include <scsi/libfc.h>
  40 #include <scsi/fc_encode.h>
  41
  42 #include <target/target_core_base.h>
  43 #include <target/target_core_transport.h>
  44 #include <target/target_core_fabric_ops.h>
  45 #include <target/target_core_device.h>
  46 #include <target/target_core_tpg.h>
  47 #include <target/target_core_configfs.h>
  48 #include <target/target_core_tmr.h>
  49 #include <target/configfs_macros.h>
  50
  51 #include "tcm_fc.h"
  52
  53 /*
  54  * Dump cmd state for debugging.
  55  */
  56 void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
  57 {
  58         struct fc_exch *ep;
  59         struct fc_seq *sp;
  60         struct se_cmd *se_cmd;
  61         struct scatterlist *sg;
  62         int count;
  63
  64         se_cmd = &cmd->se_cmd;
  65         pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
  66                 caller, cmd, cmd->sess, cmd->seq, se_cmd);
  67         pr_debug("%s: cmd %p cdb %p\n",
  68                 caller, cmd, cmd->cdb);
  69         pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun);
  70
  71         pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
  72                 caller, cmd, se_cmd->t_data_nents,
  73                se_cmd->data_length, se_cmd->se_cmd_flags);
  74
  75         for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
  76                 pr_debug("%s: cmd %p sg %p page %p "
  77                         "len 0x%x off 0x%x\n",
  78                         caller, cmd, sg,
  79                         sg_page(sg), sg->length, sg->offset);
  80
  81         sp = cmd->seq;
  82         if (sp) {
  83                 ep = fc_seq_exch(sp);
  84                 pr_debug("%s: cmd %p sid %x did %x "
  85                         "ox_id %x rx_id %x seq_id %x e_stat %x\n",
  86                         caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
  87                         sp->id, ep->esb_stat);
  88         }
  89         print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE,
  90                 16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0);
  91 }
  92
  93 static void ft_free_cmd(struct ft_cmd *cmd)
  94 {
  95         struct fc_frame *fp;
  96         struct fc_lport *lport;
  97
  98         if (!cmd)
  99                 return;
 100         fp = cmd->req_frame;
 101         lport = fr_dev(fp);
 102         if (fr_seq(fp))
 103                 lport->tt.seq_release(fr_seq(fp));
 104         fc_frame_free(fp);
 105         ft_sess_put(cmd->sess); /* undo get from lookup at recv */
 106         kfree(cmd);
 107 }
 108
 109 void ft_release_cmd(struct se_cmd *se_cmd)
 110 {
 111         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 112
 113         ft_free_cmd(cmd);
 114 }
 115
 116 void ft_check_stop_free(struct se_cmd *se_cmd)
 117 {
 118         transport_generic_free_cmd(se_cmd, 0, 0);
 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         ft_dump_cmd(cmd, __func__);
 134         ep = fc_seq_exch(cmd->seq);
 135         lport = ep->lp;
 136         len = sizeof(*fcp) + se_cmd->scsi_sense_length;
 137         fp = fc_frame_alloc(lport, len);
 138         if (!fp) {
 139                 /* XXX shouldn't just drop it - requeue and retry? */
 140                 return 0;
 141         }
 142         fcp = fc_frame_payload_get(fp, len);
 143         memset(fcp, 0, len);
 144         fcp->resp.fr_status = se_cmd->scsi_status;
 145
 146         len = se_cmd->scsi_sense_length;
 147         if (len) {
 148                 fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
 149                 fcp->ext.fr_sns_len = htonl(len);
 150                 memcpy((fcp + 1), se_cmd->sense_buffer, len);
 151         }
 152
 153         /*
 154          * Test underflow and overflow with one mask.  Usually both are off.
 155          * Bidirectional commands are not handled yet.
 156          */
 157         if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
 158                 if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
 159                         fcp->resp.fr_flags |= FCP_RESID_OVER;
 160                 else
 161                         fcp->resp.fr_flags |= FCP_RESID_UNDER;
 162                 fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
 163         }
 164
 165         /*
 166          * Send response.
 167          */
 168         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 169         fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
 170                        FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
 171
 172         lport->tt.seq_send(lport, cmd->seq, fp);
 173         lport->tt.exch_done(cmd->seq);
 174         return 0;
 175 }
 176
 177 int ft_write_pending_status(struct se_cmd *se_cmd)
 178 {
 179         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 180
 181         return cmd->write_data_len != se_cmd->data_length;
 182 }
 183
 184 /*
 185  * Send TX_RDY (transfer ready).
 186  */
 187 int ft_write_pending(struct se_cmd *se_cmd)
 188 {
 189         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 190         struct fc_frame *fp;
 191         struct fcp_txrdy *txrdy;
 192         struct fc_lport *lport;
 193         struct fc_exch *ep;
 194         struct fc_frame_header *fh;
 195         u32 f_ctl;
 196
 197         ft_dump_cmd(cmd, __func__);
 198
 199         ep = fc_seq_exch(cmd->seq);
 200         lport = ep->lp;
 201         fp = fc_frame_alloc(lport, sizeof(*txrdy));
 202         if (!fp)
 203                 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
 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 (IS_ERR(fp)) {
 270                 /* XXX need to find cmd if queued */
 271                 cmd->se_cmd.t_state = TRANSPORT_REMOVE;
 272                 cmd->seq = NULL;
 273                 transport_generic_free_cmd(&cmd->se_cmd, 0, 0);
 274                 return;
 275         }
 276
 277         fh = fc_frame_header_get(fp);
 278
 279         switch (fh->fh_r_ctl) {
 280         case FC_RCTL_DD_SOL_DATA:       /* write data */
 281                 ft_recv_write_data(cmd, fp);
 282                 break;
 283         case FC_RCTL_DD_UNSOL_CTL:      /* command */
 284         case FC_RCTL_DD_SOL_CTL:        /* transfer ready */
 285         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 286         default:
 287                 pr_debug("%s: unhandled frame r_ctl %x\n",
 288                        __func__, fh->fh_r_ctl);
 289                 ft_invl_hw_context(cmd);
 290                 fc_frame_free(fp);
 291                 transport_generic_free_cmd(&cmd->se_cmd, 0, 0);
 292                 break;
 293         }
 294 }
 295
 296 /*
 297  * Send a FCP response including SCSI status and optional FCP rsp_code.
 298  * status is SAM_STAT_GOOD (zero) iff code is valid.
 299  * This is used in error cases, such as allocation failures.
 300  */
 301 static void ft_send_resp_status(struct fc_lport *lport,
 302                                 const struct fc_frame *rx_fp,
 303                                 u32 status, enum fcp_resp_rsp_codes code)
 304 {
 305         struct fc_frame *fp;
 306         struct fc_seq *sp;
 307         const struct fc_frame_header *fh;
 308         size_t len;
 309         struct fcp_resp_with_ext *fcp;
 310         struct fcp_resp_rsp_info *info;
 311
 312         fh = fc_frame_header_get(rx_fp);
 313         pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
 314                   ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
 315         len = sizeof(*fcp);
 316         if (status == SAM_STAT_GOOD)
 317                 len += sizeof(*info);
 318         fp = fc_frame_alloc(lport, len);
 319         if (!fp)
 320                 return;
 321         fcp = fc_frame_payload_get(fp, len);
 322         memset(fcp, 0, len);
 323         fcp->resp.fr_status = status;
 324         if (status == SAM_STAT_GOOD) {
 325                 fcp->ext.fr_rsp_len = htonl(sizeof(*info));
 326                 fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
 327                 info = (struct fcp_resp_rsp_info *)(fcp + 1);
 328                 info->rsp_code = code;
 329         }
 330
 331         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
 332         sp = fr_seq(fp);
 333         if (sp)
 334                 lport->tt.seq_send(lport, sp, fp);
 335         else
 336                 lport->tt.frame_send(lport, fp);
 337 }
 338
 339 /*
 340  * Send error or task management response.
 341  */
 342 static void ft_send_resp_code(struct ft_cmd *cmd,
 343                               enum fcp_resp_rsp_codes code)
 344 {
 345         ft_send_resp_status(cmd->sess->tport->lport,
 346                             cmd->req_frame, SAM_STAT_GOOD, code);
 347 }
 348
 349
 350 /*
 351  * Send error or task management response.
 352  * Always frees the cmd and associated state.
 353  */
 354 static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
 355                                       enum fcp_resp_rsp_codes code)
 356 {
 357         ft_send_resp_code(cmd, code);
 358         ft_free_cmd(cmd);
 359 }
 360
 361 /*
 362  * Handle Task Management Request.
 363  */
 364 static void ft_send_tm(struct ft_cmd *cmd)
 365 {
 366         struct se_tmr_req *tmr;
 367         struct fcp_cmnd *fcp;
 368         struct ft_sess *sess;
 369         u8 tm_func;
 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);
 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                         transport_generic_free_cmd(&cmd->se_cmd, 0, 0);
 425                         ft_sess_put(sess);
 426                         return;
 427                 }
 428                 break;
 429         case FCP_TMF_TGT_RESET:
 430         case FCP_TMF_CLR_TASK_SET:
 431         case FCP_TMF_ABT_TASK_SET:
 432         case FCP_TMF_CLR_ACA:
 433                 break;
 434         default:
 435                 return;
 436         }
 437         transport_generic_handle_tmr(&cmd->se_cmd);
 438 }
 439
 440 /*
 441  * Send status from completed task management request.
 442  */
 443 int ft_queue_tm_resp(struct se_cmd *se_cmd)
 444 {
 445         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 446         struct se_tmr_req *tmr = se_cmd->se_tmr_req;
 447         enum fcp_resp_rsp_codes code;
 448
 449         switch (tmr->response) {
 450         case TMR_FUNCTION_COMPLETE:
 451                 code = FCP_TMF_CMPL;
 452                 break;
 453         case TMR_LUN_DOES_NOT_EXIST:
 454                 code = FCP_TMF_INVALID_LUN;
 455                 break;
 456         case TMR_FUNCTION_REJECTED:
 457                 code = FCP_TMF_REJECTED;
 458                 break;
 459         case TMR_TASK_DOES_NOT_EXIST:
 460         case TMR_TASK_STILL_ALLEGIANT:
 461         case TMR_TASK_FAILOVER_NOT_SUPPORTED:
 462         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
 463         case TMR_FUNCTION_AUTHORIZATION_FAILED:
 464         default:
 465                 code = FCP_TMF_FAILED;
 466                 break;
 467         }
 468         pr_debug("tmr fn %d resp %d fcp code %d\n",
 469                   tmr->function, tmr->response, code);
 470         ft_send_resp_code(cmd, code);
 471         return 0;
 472 }
 473
 474 static void ft_send_work(struct work_struct *work);
 475
 476 /*
 477  * Handle incoming FCP command.
 478  */
 479 static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
 480 {
 481         struct ft_cmd *cmd;
 482         struct fc_lport *lport = sess->tport->lport;
 483
 484         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 485         if (!cmd)
 486                 goto busy;
 487         cmd->sess = sess;
 488         cmd->seq = lport->tt.seq_assign(lport, fp);
 489         if (!cmd->seq) {
 490                 kfree(cmd);
 491                 goto busy;
 492         }
 493         cmd->req_frame = fp;            /* hold frame during cmd */
 494
 495         INIT_WORK(&cmd->work, ft_send_work);
 496         queue_work(sess->tport->tpg->workqueue, &cmd->work);
 497         return;
 498
 499 busy:
 500         pr_debug("cmd or seq allocation failure - sending BUSY\n");
 501         ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
 502         fc_frame_free(fp);
 503         ft_sess_put(sess);              /* undo get from lookup */
 504 }
 505
 506
 507 /*
 508  * Handle incoming FCP frame.
 509  * Caller has verified that the frame is type FCP.
 510  */
 511 void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
 512 {
 513         struct fc_frame_header *fh = fc_frame_header_get(fp);
 514
 515         switch (fh->fh_r_ctl) {
 516         case FC_RCTL_DD_UNSOL_CMD:      /* command */
 517                 ft_recv_cmd(sess, fp);
 518                 break;
 519         case FC_RCTL_DD_SOL_DATA:       /* write data */
 520         case FC_RCTL_DD_UNSOL_CTL:
 521         case FC_RCTL_DD_SOL_CTL:
 522         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 523         case FC_RCTL_ELS4_REQ:          /* SRR, perhaps */
 524         default:
 525                 pr_debug("%s: unhandled frame r_ctl %x\n",
 526                        __func__, fh->fh_r_ctl);
 527                 fc_frame_free(fp);
 528                 ft_sess_put(sess);      /* undo get from lookup */
 529                 break;
 530         }
 531 }
 532
 533 /*
 534  * Send new command to target.
 535  */
 536 static void ft_send_work(struct work_struct *work)
 537 {
 538         struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
 539         struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
 540         struct se_cmd *se_cmd;
 541         struct fcp_cmnd *fcp;
 542         int data_dir = 0;
 543         u32 data_len;
 544         int task_attr;
 545         int ret;
 546
 547         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 548         if (!fcp)
 549                 goto err;
 550
 551         if (fcp->fc_flags & FCP_CFL_LEN_MASK)
 552                 goto err;               /* not handling longer CDBs yet */
 553
 554         if (fcp->fc_tm_flags) {
 555                 task_attr = FCP_PTA_SIMPLE;
 556                 data_dir = DMA_NONE;
 557                 data_len = 0;
 558         } else {
 559                 switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
 560                 case 0:
 561                         data_dir = DMA_NONE;
 562                         break;
 563                 case FCP_CFL_RDDATA:
 564                         data_dir = DMA_FROM_DEVICE;
 565                         break;
 566                 case FCP_CFL_WRDATA:
 567                         data_dir = DMA_TO_DEVICE;
 568                         break;
 569                 case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
 570                         goto err;       /* TBD not supported by tcm_fc yet */
 571                 }
 572                 /*
 573                  * Locate the SAM Task Attr from fc_pri_ta
 574                  */
 575                 switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
 576                 case FCP_PTA_HEADQ:
 577                         task_attr = MSG_HEAD_TAG;
 578                         break;
 579                 case FCP_PTA_ORDERED:
 580                         task_attr = MSG_ORDERED_TAG;
 581                         break;
 582                 case FCP_PTA_ACA:
 583                         task_attr = MSG_ACA_TAG;
 584                         break;
 585                 case FCP_PTA_SIMPLE: /* Fallthrough */
 586                 default:
 587                         task_attr = MSG_SIMPLE_TAG;
 588                 }
 589
 590
 591                 task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
 592                 data_len = ntohl(fcp->fc_dl);
 593                 cmd->cdb = fcp->fc_cdb;
 594         }
 595
 596         se_cmd = &cmd->se_cmd;
 597         /*
 598          * Initialize struct se_cmd descriptor from target_core_mod
 599          * infrastructure
 600          */
 601         transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
 602                               data_len, data_dir, task_attr,
 603                               &cmd->ft_sense_buffer[0]);
 604         /*
 605          * Check for FCP task management flags
 606          */
 607         if (fcp->fc_tm_flags) {
 608                 ft_send_tm(cmd);
 609                 return;
 610         }
 611
 612         fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
 613
 614         cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 615         ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun);
 616         if (ret < 0) {
 617                 ft_dump_cmd(cmd, __func__);
 618                 transport_send_check_condition_and_sense(&cmd->se_cmd,
 619                         cmd->se_cmd.scsi_sense_reason, 0);
 620                 return;
 621         }
 622
 623         ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
 624
 625         pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
 626         ft_dump_cmd(cmd, __func__);
 627
 628         if (ret == -ENOMEM) {
 629                 transport_send_check_condition_and_sense(se_cmd,
 630                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
 631                 transport_generic_free_cmd(se_cmd, 0, 0);
 632                 return;
 633         }
 634         if (ret == -EINVAL) {
 635                 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
 636                         ft_queue_status(se_cmd);
 637                 else
 638                         transport_send_check_condition_and_sense(se_cmd,
 639                                         se_cmd->scsi_sense_reason, 0);
 640                 transport_generic_free_cmd(se_cmd, 0, 0);
 641                 return;
 642         }
 643         transport_generic_handle_cdb(se_cmd);
 644         return;
 645
 646 err:
 647         ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 648 }