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

   1 /*
   2  * Copyright (c) 2010 Cisco Systems, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 /* XXX TBD some includes may be extraneous */
  19
  20 #include <linux/module.h>
  21 #include <linux/moduleparam.h>
  22 #include <generated/utsrelease.h>
  23 #include <linux/utsname.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/kthread.h>
  27 #include <linux/types.h>
  28 #include <linux/string.h>
  29 #include <linux/configfs.h>
  30 #include <linux/ctype.h>
  31 #include <linux/hash.h>
  32 #include <asm/unaligned.h>
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_host.h>
  35 #include <scsi/scsi_device.h>
  36 #include <scsi/scsi_cmnd.h>
  37 #include <scsi/scsi_tcq.h>
  38 #include <scsi/libfc.h>
  39 #include <scsi/fc_encode.h>
  40
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_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 void ft_check_stop_free(struct se_cmd *se_cmd)
 116 {
 117         transport_generic_free_cmd(se_cmd, 0);
 118 }
 119
 120 /*
 121  * Send response.
 122  */
 123 int ft_queue_status(struct se_cmd *se_cmd)
 124 {
 125         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 126         struct fc_frame *fp;
 127         struct fcp_resp_with_ext *fcp;
 128         struct fc_lport *lport;
 129         struct fc_exch *ep;
 130         size_t len;
 131
 132         ft_dump_cmd(cmd, __func__);
 133         ep = fc_seq_exch(cmd->seq);
 134         lport = ep->lp;
 135         len = sizeof(*fcp) + se_cmd->scsi_sense_length;
 136         fp = fc_frame_alloc(lport, len);
 137         if (!fp) {
 138                 /* XXX shouldn't just drop it - requeue and retry? */
 139                 return 0;
 140         }
 141         fcp = fc_frame_payload_get(fp, len);
 142         memset(fcp, 0, len);
 143         fcp->resp.fr_status = se_cmd->scsi_status;
 144
 145         len = se_cmd->scsi_sense_length;
 146         if (len) {
 147                 fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
 148                 fcp->ext.fr_sns_len = htonl(len);
 149                 memcpy((fcp + 1), se_cmd->sense_buffer, len);
 150         }
 151
 152         /*
 153          * Test underflow and overflow with one mask.  Usually both are off.
 154          * Bidirectional commands are not handled yet.
 155          */
 156         if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
 157                 if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
 158                         fcp->resp.fr_flags |= FCP_RESID_OVER;
 159                 else
 160                         fcp->resp.fr_flags |= FCP_RESID_UNDER;
 161                 fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
 162         }
 163
 164         /*
 165          * Send response.
 166          */
 167         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 168         fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
 169                        FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
 170
 171         lport->tt.seq_send(lport, cmd->seq, fp);
 172         lport->tt.exch_done(cmd->seq);
 173         return 0;
 174 }
 175
 176 int ft_write_pending_status(struct se_cmd *se_cmd)
 177 {
 178         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 179
 180         return cmd->write_data_len != se_cmd->data_length;
 181 }
 182
 183 /*
 184  * Send TX_RDY (transfer ready).
 185  */
 186 int ft_write_pending(struct se_cmd *se_cmd)
 187 {
 188         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 189         struct fc_frame *fp;
 190         struct fcp_txrdy *txrdy;
 191         struct fc_lport *lport;
 192         struct fc_exch *ep;
 193         struct fc_frame_header *fh;
 194         u32 f_ctl;
 195
 196         ft_dump_cmd(cmd, __func__);
 197
 198         ep = fc_seq_exch(cmd->seq);
 199         lport = ep->lp;
 200         fp = fc_frame_alloc(lport, sizeof(*txrdy));
 201         if (!fp)
 202                 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
 203
 204         txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
 205         memset(txrdy, 0, sizeof(*txrdy));
 206         txrdy->ft_burst_len = htonl(se_cmd->data_length);
 207
 208         cmd->seq = lport->tt.seq_start_next(cmd->seq);
 209         fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
 210                        FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
 211
 212         fh = fc_frame_header_get(fp);
 213         f_ctl = ntoh24(fh->fh_f_ctl);
 214
 215         /* Only if it is 'Exchange Responder' */
 216         if (f_ctl & FC_FC_EX_CTX) {
 217                 /* Target is 'exchange responder' and sending XFER_READY
 218                  * to 'exchange initiator (initiator)'
 219                  */
 220                 if ((ep->xid <= lport->lro_xid) &&
 221                     (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
 222                         if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
 223                                 /*
 224                                  * cmd may have been broken up into multiple
 225                                  * tasks. Link their sgs together so we can
 226                                  * operate on them all at once.
 227                                  */
 228                                 transport_do_task_sg_chain(se_cmd);
 229                                 cmd->sg = se_cmd->t_tasks_sg_chained;
 230                                 cmd->sg_cnt =
 231                                         se_cmd->t_tasks_sg_chained_no;
 232                         }
 233                         if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
 234                                                             cmd->sg,
 235                                                             cmd->sg_cnt))
 236                                 cmd->was_ddp_setup = 1;
 237                 }
 238         }
 239         lport->tt.seq_send(lport, cmd->seq, fp);
 240         return 0;
 241 }
 242
 243 u32 ft_get_task_tag(struct se_cmd *se_cmd)
 244 {
 245         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 246
 247         return fc_seq_exch(cmd->seq)->rxid;
 248 }
 249
 250 int ft_get_cmd_state(struct se_cmd *se_cmd)
 251 {
 252         return 0;
 253 }
 254
 255 int ft_is_state_remove(struct se_cmd *se_cmd)
 256 {
 257         return 0;       /* XXX TBD */
 258 }
 259
 260 /*
 261  * FC sequence response handler for follow-on sequences (data) and aborts.
 262  */
 263 static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
 264 {
 265         struct ft_cmd *cmd = arg;
 266         struct fc_frame_header *fh;
 267
 268         if (IS_ERR(fp)) {
 269                 /* XXX need to find cmd if queued */
 270                 cmd->seq = NULL;
 271                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 272                 return;
 273         }
 274
 275         fh = fc_frame_header_get(fp);
 276
 277         switch (fh->fh_r_ctl) {
 278         case FC_RCTL_DD_SOL_DATA:       /* write data */
 279                 ft_recv_write_data(cmd, fp);
 280                 break;
 281         case FC_RCTL_DD_UNSOL_CTL:      /* command */
 282         case FC_RCTL_DD_SOL_CTL:        /* transfer ready */
 283         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 284         default:
 285                 pr_debug("%s: unhandled frame r_ctl %x\n",
 286                        __func__, fh->fh_r_ctl);
 287                 ft_invl_hw_context(cmd);
 288                 fc_frame_free(fp);
 289                 transport_generic_free_cmd(&cmd->se_cmd, 0);
 290                 break;
 291         }
 292 }
 293
 294 /*
 295  * Send a FCP response including SCSI status and optional FCP rsp_code.
 296  * status is SAM_STAT_GOOD (zero) iff code is valid.
 297  * This is used in error cases, such as allocation failures.
 298  */
 299 static void ft_send_resp_status(struct fc_lport *lport,
 300                                 const struct fc_frame *rx_fp,
 301                                 u32 status, enum fcp_resp_rsp_codes code)
 302 {
 303         struct fc_frame *fp;
 304         struct fc_seq *sp;
 305         const struct fc_frame_header *fh;
 306         size_t len;
 307         struct fcp_resp_with_ext *fcp;
 308         struct fcp_resp_rsp_info *info;
 309
 310         fh = fc_frame_header_get(rx_fp);
 311         pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
 312                   ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
 313         len = sizeof(*fcp);
 314         if (status == SAM_STAT_GOOD)
 315                 len += sizeof(*info);
 316         fp = fc_frame_alloc(lport, len);
 317         if (!fp)
 318                 return;
 319         fcp = fc_frame_payload_get(fp, len);
 320         memset(fcp, 0, len);
 321         fcp->resp.fr_status = status;
 322         if (status == SAM_STAT_GOOD) {
 323                 fcp->ext.fr_rsp_len = htonl(sizeof(*info));
 324                 fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
 325                 info = (struct fcp_resp_rsp_info *)(fcp + 1);
 326                 info->rsp_code = code;
 327         }
 328
 329         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
 330         sp = fr_seq(fp);
 331         if (sp)
 332                 lport->tt.seq_send(lport, sp, fp);
 333         else
 334                 lport->tt.frame_send(lport, fp);
 335 }
 336
 337 /*
 338  * Send error or task management response.
 339  */
 340 static void ft_send_resp_code(struct ft_cmd *cmd,
 341                               enum fcp_resp_rsp_codes code)
 342 {
 343         ft_send_resp_status(cmd->sess->tport->lport,
 344                             cmd->req_frame, SAM_STAT_GOOD, code);
 345 }
 346
 347
 348 /*
 349  * Send error or task management response.
 350  * Always frees the cmd and associated state.
 351  */
 352 static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
 353                                       enum fcp_resp_rsp_codes code)
 354 {
 355         ft_send_resp_code(cmd, code);
 356         ft_free_cmd(cmd);
 357 }
 358
 359 /*
 360  * Handle Task Management Request.
 361  */
 362 static void ft_send_tm(struct ft_cmd *cmd)
 363 {
 364         struct se_tmr_req *tmr;
 365         struct fcp_cmnd *fcp;
 366         struct ft_sess *sess;
 367         u8 tm_func;
 368
 369         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 370
 371         switch (fcp->fc_tm_flags) {
 372         case FCP_TMF_LUN_RESET:
 373                 tm_func = TMR_LUN_RESET;
 374                 break;
 375         case FCP_TMF_TGT_RESET:
 376                 tm_func = TMR_TARGET_WARM_RESET;
 377                 break;
 378         case FCP_TMF_CLR_TASK_SET:
 379                 tm_func = TMR_CLEAR_TASK_SET;
 380                 break;
 381         case FCP_TMF_ABT_TASK_SET:
 382                 tm_func = TMR_ABORT_TASK_SET;
 383                 break;
 384         case FCP_TMF_CLR_ACA:
 385                 tm_func = TMR_CLEAR_ACA;
 386                 break;
 387         default:
 388                 /*
 389                  * FCP4r01 indicates having a combination of
 390                  * tm_flags set is invalid.
 391                  */
 392                 pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
 393                 ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 394                 return;
 395         }
 396
 397         pr_debug("alloc tm cmd fn %d\n", tm_func);
 398         tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
 399         if (!tmr) {
 400                 pr_debug("alloc failed\n");
 401                 ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
 402                 return;
 403         }
 404         cmd->se_cmd.se_tmr_req = tmr;
 405
 406         switch (fcp->fc_tm_flags) {
 407         case FCP_TMF_LUN_RESET:
 408                 cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 409                 if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
 410                         /*
 411                          * Make sure to clean up newly allocated TMR request
 412                          * since "unable to  handle TMR request because failed
 413                          * to get to LUN"
 414                          */
 415                         pr_debug("Failed to get LUN for TMR func %d, "
 416                                   "se_cmd %p, unpacked_lun %d\n",
 417                                   tm_func, &cmd->se_cmd, cmd->lun);
 418                         ft_dump_cmd(cmd, __func__);
 419                         sess = cmd->sess;
 420                         transport_send_check_condition_and_sense(&cmd->se_cmd,
 421                                 cmd->se_cmd.scsi_sense_reason, 0);
 422                         transport_generic_free_cmd(&cmd->se_cmd, 0);
 423                         ft_sess_put(sess);
 424                         return;
 425                 }
 426                 break;
 427         case FCP_TMF_TGT_RESET:
 428         case FCP_TMF_CLR_TASK_SET:
 429         case FCP_TMF_ABT_TASK_SET:
 430         case FCP_TMF_CLR_ACA:
 431                 break;
 432         default:
 433                 return;
 434         }
 435         transport_generic_handle_tmr(&cmd->se_cmd);
 436 }
 437
 438 /*
 439  * Send status from completed task management request.
 440  */
 441 int ft_queue_tm_resp(struct se_cmd *se_cmd)
 442 {
 443         struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
 444         struct se_tmr_req *tmr = se_cmd->se_tmr_req;
 445         enum fcp_resp_rsp_codes code;
 446
 447         switch (tmr->response) {
 448         case TMR_FUNCTION_COMPLETE:
 449                 code = FCP_TMF_CMPL;
 450                 break;
 451         case TMR_LUN_DOES_NOT_EXIST:
 452                 code = FCP_TMF_INVALID_LUN;
 453                 break;
 454         case TMR_FUNCTION_REJECTED:
 455                 code = FCP_TMF_REJECTED;
 456                 break;
 457         case TMR_TASK_DOES_NOT_EXIST:
 458         case TMR_TASK_STILL_ALLEGIANT:
 459         case TMR_TASK_FAILOVER_NOT_SUPPORTED:
 460         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
 461         case TMR_FUNCTION_AUTHORIZATION_FAILED:
 462         default:
 463                 code = FCP_TMF_FAILED;
 464                 break;
 465         }
 466         pr_debug("tmr fn %d resp %d fcp code %d\n",
 467                   tmr->function, tmr->response, code);
 468         ft_send_resp_code(cmd, code);
 469         return 0;
 470 }
 471
 472 static void ft_send_work(struct work_struct *work);
 473
 474 /*
 475  * Handle incoming FCP command.
 476  */
 477 static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
 478 {
 479         struct ft_cmd *cmd;
 480         struct fc_lport *lport = sess->tport->lport;
 481
 482         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 483         if (!cmd)
 484                 goto busy;
 485         cmd->sess = sess;
 486         cmd->seq = lport->tt.seq_assign(lport, fp);
 487         if (!cmd->seq) {
 488                 kfree(cmd);
 489                 goto busy;
 490         }
 491         cmd->req_frame = fp;            /* hold frame during cmd */
 492
 493         INIT_WORK(&cmd->work, ft_send_work);
 494         queue_work(sess->tport->tpg->workqueue, &cmd->work);
 495         return;
 496
 497 busy:
 498         pr_debug("cmd or seq allocation failure - sending BUSY\n");
 499         ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
 500         fc_frame_free(fp);
 501         ft_sess_put(sess);              /* undo get from lookup */
 502 }
 503
 504
 505 /*
 506  * Handle incoming FCP frame.
 507  * Caller has verified that the frame is type FCP.
 508  */
 509 void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
 510 {
 511         struct fc_frame_header *fh = fc_frame_header_get(fp);
 512
 513         switch (fh->fh_r_ctl) {
 514         case FC_RCTL_DD_UNSOL_CMD:      /* command */
 515                 ft_recv_cmd(sess, fp);
 516                 break;
 517         case FC_RCTL_DD_SOL_DATA:       /* write data */
 518         case FC_RCTL_DD_UNSOL_CTL:
 519         case FC_RCTL_DD_SOL_CTL:
 520         case FC_RCTL_DD_DATA_DESC:      /* transfer ready */
 521         case FC_RCTL_ELS4_REQ:          /* SRR, perhaps */
 522         default:
 523                 pr_debug("%s: unhandled frame r_ctl %x\n",
 524                        __func__, fh->fh_r_ctl);
 525                 fc_frame_free(fp);
 526                 ft_sess_put(sess);      /* undo get from lookup */
 527                 break;
 528         }
 529 }
 530
 531 /*
 532  * Send new command to target.
 533  */
 534 static void ft_send_work(struct work_struct *work)
 535 {
 536         struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
 537         struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
 538         struct se_cmd *se_cmd;
 539         struct fcp_cmnd *fcp;
 540         int data_dir = 0;
 541         u32 data_len;
 542         int task_attr;
 543         int ret;
 544
 545         fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
 546         if (!fcp)
 547                 goto err;
 548
 549         if (fcp->fc_flags & FCP_CFL_LEN_MASK)
 550                 goto err;               /* not handling longer CDBs yet */
 551
 552         if (fcp->fc_tm_flags) {
 553                 task_attr = FCP_PTA_SIMPLE;
 554                 data_dir = DMA_NONE;
 555                 data_len = 0;
 556         } else {
 557                 switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
 558                 case 0:
 559                         data_dir = DMA_NONE;
 560                         break;
 561                 case FCP_CFL_RDDATA:
 562                         data_dir = DMA_FROM_DEVICE;
 563                         break;
 564                 case FCP_CFL_WRDATA:
 565                         data_dir = DMA_TO_DEVICE;
 566                         break;
 567                 case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
 568                         goto err;       /* TBD not supported by tcm_fc yet */
 569                 }
 570                 /*
 571                  * Locate the SAM Task Attr from fc_pri_ta
 572                  */
 573                 switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
 574                 case FCP_PTA_HEADQ:
 575                         task_attr = MSG_HEAD_TAG;
 576                         break;
 577                 case FCP_PTA_ORDERED:
 578                         task_attr = MSG_ORDERED_TAG;
 579                         break;
 580                 case FCP_PTA_ACA:
 581                         task_attr = MSG_ACA_TAG;
 582                         break;
 583                 case FCP_PTA_SIMPLE: /* Fallthrough */
 584                 default:
 585                         task_attr = MSG_SIMPLE_TAG;
 586                 }
 587
 588
 589                 task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
 590                 data_len = ntohl(fcp->fc_dl);
 591                 cmd->cdb = fcp->fc_cdb;
 592         }
 593
 594         se_cmd = &cmd->se_cmd;
 595         /*
 596          * Initialize struct se_cmd descriptor from target_core_mod
 597          * infrastructure
 598          */
 599         transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
 600                               data_len, data_dir, task_attr,
 601                               &cmd->ft_sense_buffer[0]);
 602         /*
 603          * Check for FCP task management flags
 604          */
 605         if (fcp->fc_tm_flags) {
 606                 ft_send_tm(cmd);
 607                 return;
 608         }
 609
 610         fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
 611
 612         cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
 613         ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun);
 614         if (ret < 0) {
 615                 ft_dump_cmd(cmd, __func__);
 616                 transport_send_check_condition_and_sense(&cmd->se_cmd,
 617                         cmd->se_cmd.scsi_sense_reason, 0);
 618                 return;
 619         }
 620
 621         ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
 622
 623         pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
 624         ft_dump_cmd(cmd, __func__);
 625
 626         if (ret == -ENOMEM) {
 627                 transport_send_check_condition_and_sense(se_cmd,
 628                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
 629                 transport_generic_free_cmd(se_cmd, 0);
 630                 return;
 631         }
 632         if (ret == -EINVAL) {
 633                 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
 634                         ft_queue_status(se_cmd);
 635                 else
 636                         transport_send_check_condition_and_sense(se_cmd,
 637                                         se_cmd->scsi_sense_reason, 0);
 638                 transport_generic_free_cmd(se_cmd, 0);
 639                 return;
 640         }
 641         transport_handle_cdb_direct(se_cmd);
 642         return;
 643
 644 err:
 645         ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
 646 }