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         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 -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 (IS_ERR(fp)) {
 270                 /* XXX need to find cmd if queued */
 271                 cmd->seq = NULL;
 272                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 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         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 373
 374         switch (fcp->fc_tm_flags) {
 375         case FCP_TMF_LUN_RESET:
 376                 tm_func = TMR_LUN_RESET;
 377                 break;
 378         case FCP_TMF_TGT_RESET:
 379                 tm_func = TMR_TARGET_WARM_RESET;
 380                 break;
 381         case FCP_TMF_CLR_TASK_SET:
 382                 tm_func = TMR_CLEAR_TASK_SET;
 383                 break;
 384         case FCP_TMF_ABT_TASK_SET:
 385                 tm_func = TMR_ABORT_TASK_SET;
 386                 break;
 387         case FCP_TMF_CLR_ACA:
 388                 tm_func = TMR_CLEAR_ACA;
 389                 break;
 390         default:
 391                 /*
 392                  * FCP4r01 indicates having a combination of
 393                  * tm_flags set is invalid.
 394                  */
 395                 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
 396                 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 397                 return;
 398         }
 399
 400         pr_debug("alloc tm cmd fn %d\n", tm_func);
 401         tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
 402         if (!tmr) {
 403                 pr_debug("alloc failed\n");
 404                 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
 405                 return;
 406         }
 407         cmd->se_cmd.se_tmr_req = tmr;
 408
 409         switch (fcp->fc_tm_flags) {
 410         case FCP_TMF_LUN_RESET:
 411                 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 412                 if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
 413                         /*
 414                          * Make sure to clean up newly allocated TMR request
 415                          * since "unable to  handle TMR request because failed
 416                          * to get to LUN"
 417                          */
 418                         pr_debug("Failed to get LUN for TMR func %d, "
 419                                   "se_cmd %p, unpacked_lun %d\n",
 420                                   tm_func, &cmd->se_cmd, cmd->lun);
 421                         ft_dump_cmd(cmd, __func__);
 422                         sess = cmd->sess;
 423                         transport_send_check_condition_and_sense(&cmd->se_cmd,
 424                                 cmd->se_cmd.scsi_sense_reason, 0);
 425                         transport_generic_free_cmd(&cmd->se_cmd, 0);
 426                         ft_sess_put(sess);
 427                         return;
 428                 }
 429                 break;
 430         case FCP_TMF_TGT_RESET:
 431         case FCP_TMF_CLR_TASK_SET:
 432         case FCP_TMF_ABT_TASK_SET:
 433         case FCP_TMF_CLR_ACA:
 434                 break;
 435         default:
 436                 return;
 437         }
 438         transport_generic_handle_tmr(&cmd->se_cmd);
 439 }
 440
 441 /*
 442  * Send status from completed task management request.
 443  */
 444 int ft_queue_tm_resp(struct se_cmd *se_cmd)
 445 {
 446         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 447         struct se_tmr_req *tmr = se_cmd->se_tmr_req;
 448         enum fcp_resp_rsp_codes code;
 449
 450         switch (tmr->response) {
 451         case TMR_FUNCTION_COMPLETE:
 452                 code = FCP_TMF_CMPL;
 453                 break;
 454         case TMR_LUN_DOES_NOT_EXIST:
 455                 code = FCP_TMF_INVALID_LUN;
 456                 break;
 457         case TMR_FUNCTION_REJECTED:
 458                 code = FCP_TMF_REJECTED;
 459                 break;
 460         case TMR_TASK_DOES_NOT_EXIST:
 461         case TMR_TASK_STILL_ALLEGIANT:
 462         case TMR_TASK_FAILOVER_NOT_SUPPORTED:
 463         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
 464         case TMR_FUNCTION_AUTHORIZATION_FAILED:
 465         default:
 466                 code = FCP_TMF_FAILED;
 467                 break;
 468         }
 469         pr_debug("tmr fn %d resp %d fcp code %d\n",
 470                   tmr->function, tmr->response, code);
 471         ft_send_resp_code(cmd, code);
 472         return 0;
 473 }
 474
 475 static void ft_send_work(struct work_struct *work);
 476
 477 /*
 478  * Handle incoming FCP command.
 479  */
 480 static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
 481 {
 482         struct ft_cmd *cmd;
 483         struct fc_lport *lport = sess->tport->lport;
 484
 485         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 486         if (!cmd)
 487                 goto busy;
 488         cmd->sess = sess;
 489         cmd->seq = lport->tt.seq_assign(lport, fp);
 490         if (!cmd->seq) {
 491                 kfree(cmd);
 492                 goto busy;
 493         }
 494         cmd->req_frame = fp;            /* hold frame during cmd */
 495
 496         INIT_WORK(&cmd->work, ft_send_work);
 497         queue_work(sess->tport->tpg->workqueue, &cmd->work);
 498         return;
 499
 500 busy:
 501         pr_debug("cmd or seq allocation failure - sending BUSY\n");
 502         ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
 503         fc_frame_free(fp);
 504         ft_sess_put(sess);              /* undo get from lookup */
 505 }
 506
 507
 508 /*
 509  * Handle incoming FCP frame.
 510  * Caller has verified that the frame is type FCP.
 511  */
 512 void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
 513 {
 514         struct fc_frame_header *fh = fc_frame_header_get(fp);
 515
 516         switch (fh->fh_r_ctl) {
 517         case FC_RCTL_DD_UNSOL_CMD:      /* command */
 518                 ft_recv_cmd(sess, fp);
 519                 break;
 520         case FC_RCTL_DD_SOL_DATA:       /* write data */
 521         case FC_RCTL_DD_UNSOL_CTL:
 522         case FC_RCTL_DD_SOL_CTL:
 523         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 524         case FC_RCTL_ELS4_REQ:          /* SRR, perhaps */
 525         default:
 526                 pr_debug("%s: unhandled frame r_ctl %x\n",
 527                        __func__, fh->fh_r_ctl);
 528                 fc_frame_free(fp);
 529                 ft_sess_put(sess);      /* undo get from lookup */
 530                 break;
 531         }
 532 }
 533
 534 /*
 535  * Send new command to target.
 536  */
 537 static void ft_send_work(struct work_struct *work)
 538 {
 539         struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
 540         struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
 541         struct se_cmd *se_cmd;
 542         struct fcp_cmnd *fcp;
 543         int data_dir = 0;
 544         u32 data_len;
 545         int task_attr;
 546         int ret;
 547
 548         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 549         if (!fcp)
 550                 goto err;
 551
 552         if (fcp->fc_flags & FCP_CFL_LEN_MASK)
 553                 goto err;               /* not handling longer CDBs yet */
 554
 555         if (fcp->fc_tm_flags) {
 556                 task_attr = FCP_PTA_SIMPLE;
 557                 data_dir = DMA_NONE;
 558                 data_len = 0;
 559         } else {
 560                 switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
 561                 case 0:
 562                         data_dir = DMA_NONE;
 563                         break;
 564                 case FCP_CFL_RDDATA:
 565                         data_dir = DMA_FROM_DEVICE;
 566                         break;
 567                 case FCP_CFL_WRDATA:
 568                         data_dir = DMA_TO_DEVICE;
 569                         break;
 570                 case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
 571                         goto err;       /* TBD not supported by tcm_fc yet */
 572                 }
 573                 /*
 574                  * Locate the SAM Task Attr from fc_pri_ta
 575                  */
 576                 switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
 577                 case FCP_PTA_HEADQ:
 578                         task_attr = MSG_HEAD_TAG;
 579                         break;
 580                 case FCP_PTA_ORDERED:
 581                         task_attr = MSG_ORDERED_TAG;
 582                         break;
 583                 case FCP_PTA_ACA:
 584                         task_attr = MSG_ACA_TAG;
 585                         break;
 586                 case FCP_PTA_SIMPLE: /* Fallthrough */
 587                 default:
 588                         task_attr = MSG_SIMPLE_TAG;
 589                 }
 590
 591
 592                 task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
 593                 data_len = ntohl(fcp->fc_dl);
 594                 cmd->cdb = fcp->fc_cdb;
 595         }
 596
 597         se_cmd = &cmd->se_cmd;
 598         /*
 599          * Initialize struct se_cmd descriptor from target_core_mod
 600          * infrastructure
 601          */
 602         transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
 603                               data_len, data_dir, task_attr,
 604                               &cmd->ft_sense_buffer[0]);
 605         /*
 606          * Check for FCP task management flags
 607          */
 608         if (fcp->fc_tm_flags) {
 609                 ft_send_tm(cmd);
 610                 return;
 611         }
 612
 613         fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
 614
 615         cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 616         ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun);
 617         if (ret < 0) {
 618                 ft_dump_cmd(cmd, __func__);
 619                 transport_send_check_condition_and_sense(&cmd->se_cmd,
 620                         cmd->se_cmd.scsi_sense_reason, 0);
 621                 return;
 622         }
 623
 624         ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
 625
 626         pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
 627         ft_dump_cmd(cmd, __func__);
 628
 629         if (ret == -ENOMEM) {
 630                 transport_send_check_condition_and_sense(se_cmd,
 631                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
 632                 transport_generic_free_cmd(se_cmd, 0);
 633                 return;
 634         }
 635         if (ret == -EINVAL) {
 636                 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
 637                         ft_queue_status(se_cmd);
 638                 else
 639                         transport_send_check_condition_and_sense(se_cmd,
 640                                         se_cmd->scsi_sense_reason, 0);
 641                 transport_generic_free_cmd(se_cmd, 0);
 642                 return;
 643         }
 644         transport_handle_cdb_direct(se_cmd);
 645         return;
 646
 647 err:
 648         ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 649 }