drivers/scsi/qedf/qedf_els.c

   1 /*
   2  *  QLogic FCoE Offload Driver
   3  *  Copyright (c) 2016-2018 Cavium Inc.
   4  *
   5  *  This software is available under the terms of the GNU General Public License
   6  *  (GPL) Version 2, available from the file COPYING in the main directory of
   7  *  this source tree.
   8  */
   9 #include "qedf.h"
  10
  11 /* It's assumed that the lock is held when calling this function. */
  12 static int qedf_initiate_els(struct qedf_rport *fcport, unsigned int op,
  13         void *data, uint32_t data_len,
  14         void (*cb_func)(struct qedf_els_cb_arg *cb_arg),
  15         struct qedf_els_cb_arg *cb_arg, uint32_t timer_msec)
  16 {
  17         struct qedf_ctx *qedf;
  18         struct fc_lport *lport;
  19         struct qedf_ioreq *els_req;
  20         struct qedf_mp_req *mp_req;
  21         struct fc_frame_header *fc_hdr;
  22         struct e4_fcoe_task_context *task;
  23         int rc = 0;
  24         uint32_t did, sid;
  25         uint16_t xid;
  26         struct fcoe_wqe *sqe;
  27         unsigned long flags;
  28         u16 sqe_idx;
  29
  30         if (!fcport) {
  31                 QEDF_ERR(NULL, "fcport is NULL");
  32                 rc = -EINVAL;
  33                 goto els_err;
  34         }
  35
  36         qedf = fcport->qedf;
  37         lport = qedf->lport;
  38
  39         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending ELS\n");
  40
  41         rc = fc_remote_port_chkready(fcport->rport);
  42         if (rc) {
  43                 QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: rport not ready\n", op);
  44                 rc = -EAGAIN;
  45                 goto els_err;
  46         }
  47         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
  48                 QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: link is not ready\n",
  49                           op);
  50                 rc = -EAGAIN;
  51                 goto els_err;
  52         }
  53
  54         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
  55                 QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: fcport not ready\n", op);
  56                 rc = -EINVAL;
  57                 goto els_err;
  58         }
  59
  60         els_req = qedf_alloc_cmd(fcport, QEDF_ELS);
  61         if (!els_req) {
  62                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_ELS,
  63                           "Failed to alloc ELS request 0x%x\n", op);
  64                 rc = -ENOMEM;
  65                 goto els_err;
  66         }
  67
  68         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "initiate_els els_req = "
  69                    "0x%p cb_arg = %p xid = %x\n", els_req, cb_arg,
  70                    els_req->xid);
  71         els_req->sc_cmd = NULL;
  72         els_req->cmd_type = QEDF_ELS;
  73         els_req->fcport = fcport;
  74         els_req->cb_func = cb_func;
  75         cb_arg->io_req = els_req;
  76         cb_arg->op = op;
  77         els_req->cb_arg = cb_arg;
  78         els_req->data_xfer_len = data_len;
  79
  80         /* Record which cpu this request is associated with */
  81         els_req->cpu = smp_processor_id();
  82
  83         mp_req = (struct qedf_mp_req *)&(els_req->mp_req);
  84         rc = qedf_init_mp_req(els_req);
  85         if (rc) {
  86                 QEDF_ERR(&(qedf->dbg_ctx), "ELS MP request init failed\n");
  87                 kref_put(&els_req->refcount, qedf_release_cmd);
  88                 goto els_err;
  89         } else {
  90                 rc = 0;
  91         }
  92
  93         /* Fill ELS Payload */
  94         if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) {
  95                 memcpy(mp_req->req_buf, data, data_len);
  96         } else {
  97                 QEDF_ERR(&(qedf->dbg_ctx), "Invalid ELS op 0x%x\n", op);
  98                 els_req->cb_func = NULL;
  99                 els_req->cb_arg = NULL;
 100                 kref_put(&els_req->refcount, qedf_release_cmd);
 101                 rc = -EINVAL;
 102         }
 103
 104         if (rc)
 105                 goto els_err;
 106
 107         /* Fill FC header */
 108         fc_hdr = &(mp_req->req_fc_hdr);
 109
 110         did = fcport->rdata->ids.port_id;
 111         sid = fcport->sid;
 112
 113         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_ELS_REQ, did, sid,
 114                            FC_TYPE_ELS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 115                            FC_FC_SEQ_INIT, 0);
 116
 117         /* Obtain exchange id */
 118         xid = els_req->xid;
 119
 120         spin_lock_irqsave(&fcport->rport_lock, flags);
 121
 122         sqe_idx = qedf_get_sqe_idx(fcport);
 123         sqe = &fcport->sq[sqe_idx];
 124         memset(sqe, 0, sizeof(struct fcoe_wqe));
 125
 126         /* Initialize task context for this IO request */
 127         task = qedf_get_task_mem(&qedf->tasks, xid);
 128         qedf_init_mp_task(els_req, task, sqe);
 129
 130         /* Put timer on original I/O request */
 131         if (timer_msec)
 132                 qedf_cmd_timer_set(qedf, els_req, timer_msec);
 133
 134         /* Ring doorbell */
 135         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Ringing doorbell for ELS "
 136                    "req\n");
 137         qedf_ring_doorbell(fcport);
 138         set_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
 139
 140         spin_unlock_irqrestore(&fcport->rport_lock, flags);
 141 els_err:
 142         return rc;
 143 }
 144
 145 void qedf_process_els_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
 146         struct qedf_ioreq *els_req)
 147 {
 148         struct fcoe_task_context *task_ctx;
 149         struct scsi_cmnd *sc_cmd;
 150         uint16_t xid;
 151         struct fcoe_cqe_midpath_info *mp_info;
 152
 153         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered with xid = 0x%x"
 154                    " cmd_type = %d.\n", els_req->xid, els_req->cmd_type);
 155
 156         clear_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
 157
 158         /* Kill the ELS timer */
 159         cancel_delayed_work(&els_req->timeout_work);
 160
 161         xid = els_req->xid;
 162         task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
 163         sc_cmd = els_req->sc_cmd;
 164
 165         /* Get ELS response length from CQE */
 166         mp_info = &cqe->cqe_info.midpath_info;
 167         els_req->mp_req.resp_len = mp_info->data_placement_size;
 168
 169         /* Parse ELS response */
 170         if ((els_req->cb_func) && (els_req->cb_arg)) {
 171                 els_req->cb_func(els_req->cb_arg);
 172                 els_req->cb_arg = NULL;
 173         }
 174
 175         kref_put(&els_req->refcount, qedf_release_cmd);
 176 }
 177
 178 static void qedf_rrq_compl(struct qedf_els_cb_arg *cb_arg)
 179 {
 180         struct qedf_ioreq *orig_io_req;
 181         struct qedf_ioreq *rrq_req;
 182         struct qedf_ctx *qedf;
 183         int refcount;
 184
 185         rrq_req = cb_arg->io_req;
 186         qedf = rrq_req->fcport->qedf;
 187
 188         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered.\n");
 189
 190         orig_io_req = cb_arg->aborted_io_req;
 191
 192         if (!orig_io_req)
 193                 goto out_free;
 194
 195         if (rrq_req->event != QEDF_IOREQ_EV_ELS_TMO &&
 196             rrq_req->event != QEDF_IOREQ_EV_ELS_ERR_DETECT)
 197                 cancel_delayed_work_sync(&orig_io_req->timeout_work);
 198
 199         refcount = kref_read(&orig_io_req->refcount);
 200         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "rrq_compl: orig io = %p,"
 201                    " orig xid = 0x%x, rrq_xid = 0x%x, refcount=%d\n",
 202                    orig_io_req, orig_io_req->xid, rrq_req->xid, refcount);
 203
 204         /*
 205          * This should return the aborted io_req to the command pool. Note that
 206          * we need to check the refcound in case the original request was
 207          * flushed but we get a completion on this xid.
 208          */
 209         if (orig_io_req && refcount > 0)
 210                 kref_put(&orig_io_req->refcount, qedf_release_cmd);
 211
 212 out_free:
 213         /*
 214          * Release a reference to the rrq request if we timed out as the
 215          * rrq completion handler is called directly from the timeout handler
 216          * and not from els_compl where the reference would have normally been
 217          * released.
 218          */
 219         if (rrq_req->event == QEDF_IOREQ_EV_ELS_TMO)
 220                 kref_put(&rrq_req->refcount, qedf_release_cmd);
 221         kfree(cb_arg);
 222 }
 223
 224 /* Assumes kref is already held by caller */
 225 int qedf_send_rrq(struct qedf_ioreq *aborted_io_req)
 226 {
 227
 228         struct fc_els_rrq rrq;
 229         struct qedf_rport *fcport;
 230         struct fc_lport *lport;
 231         struct qedf_els_cb_arg *cb_arg = NULL;
 232         struct qedf_ctx *qedf;
 233         uint32_t sid;
 234         uint32_t r_a_tov;
 235         int rc;
 236         int refcount;
 237
 238         if (!aborted_io_req) {
 239                 QEDF_ERR(NULL, "abort_io_req is NULL.\n");
 240                 return -EINVAL;
 241         }
 242
 243         fcport = aborted_io_req->fcport;
 244
 245         if (!fcport) {
 246                 refcount = kref_read(&aborted_io_req->refcount);
 247                 QEDF_ERR(NULL,
 248                          "RRQ work was queued prior to a flush xid=0x%x, refcount=%d.\n",
 249                          aborted_io_req->xid, refcount);
 250                 kref_put(&aborted_io_req->refcount, qedf_release_cmd);
 251                 return -EINVAL;
 252         }
 253
 254         /* Check that fcport is still offloaded */
 255         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
 256                 QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
 257                 return -EINVAL;
 258         }
 259
 260         if (!fcport->qedf) {
 261                 QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
 262                 return -EINVAL;
 263         }
 264
 265         qedf = fcport->qedf;
 266
 267         /*
 268          * Sanity check that we can send a RRQ to make sure that refcount isn't
 269          * 0
 270          */
 271         refcount = kref_read(&aborted_io_req->refcount);
 272         if (refcount != 1) {
 273                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_ELS,
 274                           "refcount for xid=%x io_req=%p refcount=%d is not 1.\n",
 275                           aborted_io_req->xid, aborted_io_req, refcount);
 276                 return -EINVAL;
 277         }
 278
 279         lport = qedf->lport;
 280         sid = fcport->sid;
 281         r_a_tov = lport->r_a_tov;
 282
 283         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending RRQ orig "
 284                    "io = %p, orig_xid = 0x%x\n", aborted_io_req,
 285                    aborted_io_req->xid);
 286         memset(&rrq, 0, sizeof(rrq));
 287
 288         cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 289         if (!cb_arg) {
 290                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
 291                           "RRQ\n");
 292                 rc = -ENOMEM;
 293                 goto rrq_err;
 294         }
 295
 296         cb_arg->aborted_io_req = aborted_io_req;
 297
 298         rrq.rrq_cmd = ELS_RRQ;
 299         hton24(rrq.rrq_s_id, sid);
 300         rrq.rrq_ox_id = htons(aborted_io_req->xid);
 301         rrq.rrq_rx_id =
 302             htons(aborted_io_req->task->tstorm_st_context.read_write.rx_id);
 303
 304         rc = qedf_initiate_els(fcport, ELS_RRQ, &rrq, sizeof(rrq),
 305             qedf_rrq_compl, cb_arg, r_a_tov);
 306
 307 rrq_err:
 308         if (rc) {
 309                 QEDF_ERR(&(qedf->dbg_ctx), "RRQ failed - release orig io "
 310                           "req 0x%x\n", aborted_io_req->xid);
 311                 kfree(cb_arg);
 312                 kref_put(&aborted_io_req->refcount, qedf_release_cmd);
 313         }
 314         return rc;
 315 }
 316
 317 static void qedf_process_l2_frame_compl(struct qedf_rport *fcport,
 318                                         struct fc_frame *fp,
 319                                         u16 l2_oxid)
 320 {
 321         struct fc_lport *lport = fcport->qedf->lport;
 322         struct fc_frame_header *fh;
 323         u32 crc;
 324
 325         fh = (struct fc_frame_header *)fc_frame_header_get(fp);
 326
 327         /* Set the OXID we return to what libfc used */
 328         if (l2_oxid != FC_XID_UNKNOWN)
 329                 fh->fh_ox_id = htons(l2_oxid);
 330
 331         /* Setup header fields */
 332         fh->fh_r_ctl = FC_RCTL_ELS_REP;
 333         fh->fh_type = FC_TYPE_ELS;
 334         /* Last sequence, end sequence */
 335         fh->fh_f_ctl[0] = 0x98;
 336         hton24(fh->fh_d_id, lport->port_id);
 337         hton24(fh->fh_s_id, fcport->rdata->ids.port_id);
 338         fh->fh_rx_id = 0xffff;
 339
 340         /* Set frame attributes */
 341         crc = fcoe_fc_crc(fp);
 342         fc_frame_init(fp);
 343         fr_dev(fp) = lport;
 344         fr_sof(fp) = FC_SOF_I3;
 345         fr_eof(fp) = FC_EOF_T;
 346         fr_crc(fp) = cpu_to_le32(~crc);
 347
 348         /* Send completed request to libfc */
 349         fc_exch_recv(lport, fp);
 350 }
 351
 352 /*
 353  * In instances where an ELS command times out we may need to restart the
 354  * rport by logging out and then logging back in.
 355  */
 356 void qedf_restart_rport(struct qedf_rport *fcport)
 357 {
 358         struct fc_lport *lport;
 359         struct fc_rport_priv *rdata;
 360         u32 port_id;
 361         unsigned long flags;
 362
 363         if (!fcport)
 364                 return;
 365
 366         spin_lock_irqsave(&fcport->rport_lock, flags);
 367         if (test_bit(QEDF_RPORT_IN_RESET, &fcport->flags) ||
 368             !test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
 369             test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
 370                 QEDF_ERR(&(fcport->qedf->dbg_ctx), "fcport %p already in reset or not offloaded.\n",
 371                     fcport);
 372                 spin_unlock_irqrestore(&fcport->rport_lock, flags);
 373                 return;
 374         }
 375
 376         /* Set that we are now in reset */
 377         set_bit(QEDF_RPORT_IN_RESET, &fcport->flags);
 378         spin_unlock_irqrestore(&fcport->rport_lock, flags);
 379
 380         rdata = fcport->rdata;
 381         if (rdata) {
 382                 lport = fcport->qedf->lport;
 383                 port_id = rdata->ids.port_id;
 384                 QEDF_ERR(&(fcport->qedf->dbg_ctx),
 385                     "LOGO port_id=%x.\n", port_id);
 386                 fc_rport_logoff(rdata);
 387                 mutex_lock(&lport->disc.disc_mutex);
 388                 /* Recreate the rport and log back in */
 389                 rdata = fc_rport_create(lport, port_id);
 390                 if (rdata) {
 391                         mutex_unlock(&lport->disc.disc_mutex);
 392                         fc_rport_login(rdata);
 393                         fcport->rdata = rdata;
 394                 } else {
 395                         mutex_unlock(&lport->disc.disc_mutex);
 396                 }
 397         }
 398         clear_bit(QEDF_RPORT_IN_RESET, &fcport->flags);
 399 }
 400
 401 static void qedf_l2_els_compl(struct qedf_els_cb_arg *cb_arg)
 402 {
 403         struct qedf_ioreq *els_req;
 404         struct qedf_rport *fcport;
 405         struct qedf_mp_req *mp_req;
 406         struct fc_frame *fp;
 407         struct fc_frame_header *fh, *mp_fc_hdr;
 408         void *resp_buf, *fc_payload;
 409         u32 resp_len;
 410         u16 l2_oxid;
 411
 412         l2_oxid = cb_arg->l2_oxid;
 413         els_req = cb_arg->io_req;
 414
 415         if (!els_req) {
 416                 QEDF_ERR(NULL, "els_req is NULL.\n");
 417                 goto free_arg;
 418         }
 419
 420         /*
 421          * If we are flushing the command just free the cb_arg as none of the
 422          * response data will be valid.
 423          */
 424         if (els_req->event == QEDF_IOREQ_EV_ELS_FLUSH)
 425                 goto free_arg;
 426
 427         fcport = els_req->fcport;
 428         mp_req = &(els_req->mp_req);
 429         mp_fc_hdr = &(mp_req->resp_fc_hdr);
 430         resp_len = mp_req->resp_len;
 431         resp_buf = mp_req->resp_buf;
 432
 433         /*
 434          * If a middle path ELS command times out, don't try to return
 435          * the command but rather do any internal cleanup and then libfc
 436          * timeout the command and clean up its internal resources.
 437          */
 438         if (els_req->event == QEDF_IOREQ_EV_ELS_TMO) {
 439                 /*
 440                  * If ADISC times out, libfc will timeout the exchange and then
 441                  * try to send a PLOGI which will timeout since the session is
 442                  * still offloaded.  Force libfc to logout the session which
 443                  * will offload the connection and allow the PLOGI response to
 444                  * flow over the LL2 path.
 445                  */
 446                 if (cb_arg->op == ELS_ADISC)
 447                         qedf_restart_rport(fcport);
 448                 return;
 449         }
 450
 451         if (sizeof(struct fc_frame_header) + resp_len > QEDF_PAGE_SIZE) {
 452                 QEDF_ERR(&(fcport->qedf->dbg_ctx), "resp_len is "
 453                    "beyond page size.\n");
 454                 goto free_arg;
 455         }
 456
 457         fp = fc_frame_alloc(fcport->qedf->lport, resp_len);
 458         if (!fp) {
 459                 QEDF_ERR(&(fcport->qedf->dbg_ctx),
 460                     "fc_frame_alloc failure.\n");
 461                 return;
 462         }
 463
 464         /* Copy frame header from firmware into fp */
 465         fh = (struct fc_frame_header *)fc_frame_header_get(fp);
 466         memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));
 467
 468         /* Copy payload from firmware into fp */
 469         fc_payload = fc_frame_payload_get(fp, resp_len);
 470         memcpy(fc_payload, resp_buf, resp_len);
 471
 472         QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
 473             "Completing OX_ID 0x%x back to libfc.\n", l2_oxid);
 474         qedf_process_l2_frame_compl(fcport, fp, l2_oxid);
 475
 476 free_arg:
 477         kfree(cb_arg);
 478 }
 479
 480 int qedf_send_adisc(struct qedf_rport *fcport, struct fc_frame *fp)
 481 {
 482         struct fc_els_adisc *adisc;
 483         struct fc_frame_header *fh;
 484         struct fc_lport *lport = fcport->qedf->lport;
 485         struct qedf_els_cb_arg *cb_arg = NULL;
 486         struct qedf_ctx *qedf;
 487         uint32_t r_a_tov = lport->r_a_tov;
 488         int rc;
 489
 490         qedf = fcport->qedf;
 491         fh = fc_frame_header_get(fp);
 492
 493         cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 494         if (!cb_arg) {
 495                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
 496                           "ADISC\n");
 497                 rc = -ENOMEM;
 498                 goto adisc_err;
 499         }
 500         cb_arg->l2_oxid = ntohs(fh->fh_ox_id);
 501
 502         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 503             "Sending ADISC ox_id=0x%x.\n", cb_arg->l2_oxid);
 504
 505         adisc = fc_frame_payload_get(fp, sizeof(*adisc));
 506
 507         rc = qedf_initiate_els(fcport, ELS_ADISC, adisc, sizeof(*adisc),
 508             qedf_l2_els_compl, cb_arg, r_a_tov);
 509
 510 adisc_err:
 511         if (rc) {
 512                 QEDF_ERR(&(qedf->dbg_ctx), "ADISC failed.\n");
 513                 kfree(cb_arg);
 514         }
 515         return rc;
 516 }
 517
 518 static void qedf_srr_compl(struct qedf_els_cb_arg *cb_arg)
 519 {
 520         struct qedf_ioreq *orig_io_req;
 521         struct qedf_ioreq *srr_req;
 522         struct qedf_mp_req *mp_req;
 523         struct fc_frame_header *mp_fc_hdr, *fh;
 524         struct fc_frame *fp;
 525         void *resp_buf, *fc_payload;
 526         u32 resp_len;
 527         struct fc_lport *lport;
 528         struct qedf_ctx *qedf;
 529         int refcount;
 530         u8 opcode;
 531
 532         srr_req = cb_arg->io_req;
 533         qedf = srr_req->fcport->qedf;
 534         lport = qedf->lport;
 535
 536         orig_io_req = cb_arg->aborted_io_req;
 537
 538         if (!orig_io_req)
 539                 goto out_free;
 540
 541         clear_bit(QEDF_CMD_SRR_SENT, &orig_io_req->flags);
 542
 543         if (srr_req->event != QEDF_IOREQ_EV_ELS_TMO &&
 544             srr_req->event != QEDF_IOREQ_EV_ELS_ERR_DETECT)
 545                 cancel_delayed_work_sync(&orig_io_req->timeout_work);
 546
 547         refcount = kref_read(&orig_io_req->refcount);
 548         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered: orig_io=%p,"
 549                    " orig_io_xid=0x%x, rec_xid=0x%x, refcount=%d\n",
 550                    orig_io_req, orig_io_req->xid, srr_req->xid, refcount);
 551
 552         /* If a SRR times out, simply free resources */
 553         if (srr_req->event == QEDF_IOREQ_EV_ELS_TMO)
 554                 goto out_put;
 555
 556         /* Normalize response data into struct fc_frame */
 557         mp_req = &(srr_req->mp_req);
 558         mp_fc_hdr = &(mp_req->resp_fc_hdr);
 559         resp_len = mp_req->resp_len;
 560         resp_buf = mp_req->resp_buf;
 561
 562         fp = fc_frame_alloc(lport, resp_len);
 563         if (!fp) {
 564                 QEDF_ERR(&(qedf->dbg_ctx),
 565                     "fc_frame_alloc failure.\n");
 566                 goto out_put;
 567         }
 568
 569         /* Copy frame header from firmware into fp */
 570         fh = (struct fc_frame_header *)fc_frame_header_get(fp);
 571         memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));
 572
 573         /* Copy payload from firmware into fp */
 574         fc_payload = fc_frame_payload_get(fp, resp_len);
 575         memcpy(fc_payload, resp_buf, resp_len);
 576
 577         opcode = fc_frame_payload_op(fp);
 578         switch (opcode) {
 579         case ELS_LS_ACC:
 580                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 581                     "SRR success.\n");
 582                 break;
 583         case ELS_LS_RJT:
 584                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_ELS,
 585                     "SRR rejected.\n");
 586                 qedf_initiate_abts(orig_io_req, true);
 587                 break;
 588         }
 589
 590         fc_frame_free(fp);
 591 out_put:
 592         /* Put reference for original command since SRR completed */
 593         kref_put(&orig_io_req->refcount, qedf_release_cmd);
 594 out_free:
 595         kfree(cb_arg);
 596 }
 597
 598 static int qedf_send_srr(struct qedf_ioreq *orig_io_req, u32 offset, u8 r_ctl)
 599 {
 600         struct fcp_srr srr;
 601         struct qedf_ctx *qedf;
 602         struct qedf_rport *fcport;
 603         struct fc_lport *lport;
 604         struct qedf_els_cb_arg *cb_arg = NULL;
 605         u32 sid, r_a_tov;
 606         int rc;
 607
 608         if (!orig_io_req) {
 609                 QEDF_ERR(NULL, "orig_io_req is NULL.\n");
 610                 return -EINVAL;
 611         }
 612
 613         fcport = orig_io_req->fcport;
 614
 615         /* Check that fcport is still offloaded */
 616         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
 617                 QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
 618                 return -EINVAL;
 619         }
 620
 621         if (!fcport->qedf) {
 622                 QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
 623                 return -EINVAL;
 624         }
 625
 626         /* Take reference until SRR command completion */
 627         kref_get(&orig_io_req->refcount);
 628
 629         qedf = fcport->qedf;
 630         lport = qedf->lport;
 631         sid = fcport->sid;
 632         r_a_tov = lport->r_a_tov;
 633
 634         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending SRR orig_io=%p, "
 635                    "orig_xid=0x%x\n", orig_io_req, orig_io_req->xid);
 636         memset(&srr, 0, sizeof(srr));
 637
 638         cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 639         if (!cb_arg) {
 640                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
 641                           "SRR\n");
 642                 rc = -ENOMEM;
 643                 goto srr_err;
 644         }
 645
 646         cb_arg->aborted_io_req = orig_io_req;
 647
 648         srr.srr_op = ELS_SRR;
 649         srr.srr_ox_id = htons(orig_io_req->xid);
 650         srr.srr_rx_id = htons(orig_io_req->rx_id);
 651         srr.srr_rel_off = htonl(offset);
 652         srr.srr_r_ctl = r_ctl;
 653
 654         rc = qedf_initiate_els(fcport, ELS_SRR, &srr, sizeof(srr),
 655             qedf_srr_compl, cb_arg, r_a_tov);
 656
 657 srr_err:
 658         if (rc) {
 659                 QEDF_ERR(&(qedf->dbg_ctx), "SRR failed - release orig_io_req"
 660                           "=0x%x\n", orig_io_req->xid);
 661                 kfree(cb_arg);
 662                 /* If we fail to queue SRR, send ABTS to orig_io */
 663                 qedf_initiate_abts(orig_io_req, true);
 664                 kref_put(&orig_io_req->refcount, qedf_release_cmd);
 665         } else
 666                 /* Tell other threads that SRR is in progress */
 667                 set_bit(QEDF_CMD_SRR_SENT, &orig_io_req->flags);
 668
 669         return rc;
 670 }
 671
 672 static void qedf_initiate_seq_cleanup(struct qedf_ioreq *orig_io_req,
 673         u32 offset, u8 r_ctl)
 674 {
 675         struct qedf_rport *fcport;
 676         unsigned long flags;
 677         struct qedf_els_cb_arg *cb_arg;
 678         struct fcoe_wqe *sqe;
 679         u16 sqe_idx;
 680
 681         fcport = orig_io_req->fcport;
 682
 683         QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
 684             "Doing sequence cleanup for xid=0x%x offset=%u.\n",
 685             orig_io_req->xid, offset);
 686
 687         cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 688         if (!cb_arg) {
 689                 QEDF_ERR(&(fcport->qedf->dbg_ctx), "Unable to allocate cb_arg "
 690                           "for sequence cleanup\n");
 691                 return;
 692         }
 693
 694         /* Get reference for cleanup request */
 695         kref_get(&orig_io_req->refcount);
 696
 697         orig_io_req->cmd_type = QEDF_SEQ_CLEANUP;
 698         cb_arg->offset = offset;
 699         cb_arg->r_ctl = r_ctl;
 700         orig_io_req->cb_arg = cb_arg;
 701
 702         qedf_cmd_timer_set(fcport->qedf, orig_io_req,
 703             QEDF_CLEANUP_TIMEOUT * HZ);
 704
 705         spin_lock_irqsave(&fcport->rport_lock, flags);
 706
 707         sqe_idx = qedf_get_sqe_idx(fcport);
 708         sqe = &fcport->sq[sqe_idx];
 709         memset(sqe, 0, sizeof(struct fcoe_wqe));
 710         orig_io_req->task_params->sqe = sqe;
 711
 712         init_initiator_sequence_recovery_fcoe_task(orig_io_req->task_params,
 713                                                    offset);
 714         qedf_ring_doorbell(fcport);
 715
 716         spin_unlock_irqrestore(&fcport->rport_lock, flags);
 717 }
 718
 719 void qedf_process_seq_cleanup_compl(struct qedf_ctx *qedf,
 720         struct fcoe_cqe *cqe, struct qedf_ioreq *io_req)
 721 {
 722         int rc;
 723         struct qedf_els_cb_arg *cb_arg;
 724
 725         cb_arg = io_req->cb_arg;
 726
 727         /* If we timed out just free resources */
 728         if (io_req->event == QEDF_IOREQ_EV_ELS_TMO || !cqe)
 729                 goto free;
 730
 731         /* Kill the timer we put on the request */
 732         cancel_delayed_work_sync(&io_req->timeout_work);
 733
 734         rc = qedf_send_srr(io_req, cb_arg->offset, cb_arg->r_ctl);
 735         if (rc)
 736                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to send SRR, I/O will "
 737                     "abort, xid=0x%x.\n", io_req->xid);
 738 free:
 739         kfree(cb_arg);
 740         kref_put(&io_req->refcount, qedf_release_cmd);
 741 }
 742
 743 static bool qedf_requeue_io_req(struct qedf_ioreq *orig_io_req)
 744 {
 745         struct qedf_rport *fcport;
 746         struct qedf_ioreq *new_io_req;
 747         unsigned long flags;
 748         bool rc = false;
 749
 750         fcport = orig_io_req->fcport;
 751         if (!fcport) {
 752                 QEDF_ERR(NULL, "fcport is NULL.\n");
 753                 goto out;
 754         }
 755
 756         if (!orig_io_req->sc_cmd) {
 757                 QEDF_ERR(&(fcport->qedf->dbg_ctx), "sc_cmd is NULL for "
 758                     "xid=0x%x.\n", orig_io_req->xid);
 759                 goto out;
 760         }
 761
 762         new_io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
 763         if (!new_io_req) {
 764                 QEDF_ERR(&(fcport->qedf->dbg_ctx), "Could not allocate new "
 765                     "io_req.\n");
 766                 goto out;
 767         }
 768
 769         new_io_req->sc_cmd = orig_io_req->sc_cmd;
 770
 771         /*
 772          * This keeps the sc_cmd struct from being returned to the tape
 773          * driver and being requeued twice. We do need to put a reference
 774          * for the original I/O request since we will not do a SCSI completion
 775          * for it.
 776          */
 777         orig_io_req->sc_cmd = NULL;
 778         kref_put(&orig_io_req->refcount, qedf_release_cmd);
 779
 780         spin_lock_irqsave(&fcport->rport_lock, flags);
 781
 782         /* kref for new command released in qedf_post_io_req on error */
 783         if (qedf_post_io_req(fcport, new_io_req)) {
 784                 QEDF_ERR(&(fcport->qedf->dbg_ctx), "Unable to post io_req\n");
 785                 /* Return SQE to pool */
 786                 atomic_inc(&fcport->free_sqes);
 787         } else {
 788                 QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
 789                     "Reissued SCSI command from  orig_xid=0x%x on "
 790                     "new_xid=0x%x.\n", orig_io_req->xid, new_io_req->xid);
 791                 /*
 792                  * Abort the original I/O but do not return SCSI command as
 793                  * it has been reissued on another OX_ID.
 794                  */
 795                 spin_unlock_irqrestore(&fcport->rport_lock, flags);
 796                 qedf_initiate_abts(orig_io_req, false);
 797                 goto out;
 798         }
 799
 800         spin_unlock_irqrestore(&fcport->rport_lock, flags);
 801 out:
 802         return rc;
 803 }
 804
 805
 806 static void qedf_rec_compl(struct qedf_els_cb_arg *cb_arg)
 807 {
 808         struct qedf_ioreq *orig_io_req;
 809         struct qedf_ioreq *rec_req;
 810         struct qedf_mp_req *mp_req;
 811         struct fc_frame_header *mp_fc_hdr, *fh;
 812         struct fc_frame *fp;
 813         void *resp_buf, *fc_payload;
 814         u32 resp_len;
 815         struct fc_lport *lport;
 816         struct qedf_ctx *qedf;
 817         int refcount;
 818         enum fc_rctl r_ctl;
 819         struct fc_els_ls_rjt *rjt;
 820         struct fc_els_rec_acc *acc;
 821         u8 opcode;
 822         u32 offset, e_stat;
 823         struct scsi_cmnd *sc_cmd;
 824         bool srr_needed = false;
 825
 826         rec_req = cb_arg->io_req;
 827         qedf = rec_req->fcport->qedf;
 828         lport = qedf->lport;
 829
 830         orig_io_req = cb_arg->aborted_io_req;
 831
 832         if (!orig_io_req)
 833                 goto out_free;
 834
 835         if (rec_req->event != QEDF_IOREQ_EV_ELS_TMO &&
 836             rec_req->event != QEDF_IOREQ_EV_ELS_ERR_DETECT)
 837                 cancel_delayed_work_sync(&orig_io_req->timeout_work);
 838
 839         refcount = kref_read(&orig_io_req->refcount);
 840         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered: orig_io=%p,"
 841                    " orig_io_xid=0x%x, rec_xid=0x%x, refcount=%d\n",
 842                    orig_io_req, orig_io_req->xid, rec_req->xid, refcount);
 843
 844         /* If a REC times out, free resources */
 845         if (rec_req->event == QEDF_IOREQ_EV_ELS_TMO)
 846                 goto out_put;
 847
 848         /* Normalize response data into struct fc_frame */
 849         mp_req = &(rec_req->mp_req);
 850         mp_fc_hdr = &(mp_req->resp_fc_hdr);
 851         resp_len = mp_req->resp_len;
 852         acc = resp_buf = mp_req->resp_buf;
 853
 854         fp = fc_frame_alloc(lport, resp_len);
 855         if (!fp) {
 856                 QEDF_ERR(&(qedf->dbg_ctx),
 857                     "fc_frame_alloc failure.\n");
 858                 goto out_put;
 859         }
 860
 861         /* Copy frame header from firmware into fp */
 862         fh = (struct fc_frame_header *)fc_frame_header_get(fp);
 863         memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));
 864
 865         /* Copy payload from firmware into fp */
 866         fc_payload = fc_frame_payload_get(fp, resp_len);
 867         memcpy(fc_payload, resp_buf, resp_len);
 868
 869         opcode = fc_frame_payload_op(fp);
 870         if (opcode == ELS_LS_RJT) {
 871                 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
 872                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 873                     "Received LS_RJT for REC: er_reason=0x%x, "
 874                     "er_explan=0x%x.\n", rjt->er_reason, rjt->er_explan);
 875                 /*
 876                  * The following response(s) mean that we need to reissue the
 877                  * request on another exchange.  We need to do this without
 878                  * informing the upper layers lest it cause an application
 879                  * error.
 880                  */
 881                 if ((rjt->er_reason == ELS_RJT_LOGIC ||
 882                     rjt->er_reason == ELS_RJT_UNAB) &&
 883                     rjt->er_explan == ELS_EXPL_OXID_RXID) {
 884                         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 885                             "Handle CMD LOST case.\n");
 886                         qedf_requeue_io_req(orig_io_req);
 887                 }
 888         } else if (opcode == ELS_LS_ACC) {
 889                 offset = ntohl(acc->reca_fc4value);
 890                 e_stat = ntohl(acc->reca_e_stat);
 891                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 892                     "Received LS_ACC for REC: offset=0x%x, e_stat=0x%x.\n",
 893                     offset, e_stat);
 894                 if (e_stat & ESB_ST_SEQ_INIT)  {
 895                         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 896                             "Target has the seq init\n");
 897                         goto out_free_frame;
 898                 }
 899                 sc_cmd = orig_io_req->sc_cmd;
 900                 if (!sc_cmd) {
 901                         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 902                             "sc_cmd is NULL for xid=0x%x.\n",
 903                             orig_io_req->xid);
 904                         goto out_free_frame;
 905                 }
 906                 /* SCSI write case */
 907                 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
 908                         if (offset == orig_io_req->data_xfer_len) {
 909                                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 910                                     "WRITE - response lost.\n");
 911                                 r_ctl = FC_RCTL_DD_CMD_STATUS;
 912                                 srr_needed = true;
 913                                 offset = 0;
 914                         } else {
 915                                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 916                                     "WRITE - XFER_RDY/DATA lost.\n");
 917                                 r_ctl = FC_RCTL_DD_DATA_DESC;
 918                                 /* Use data from warning CQE instead of REC */
 919                                 offset = orig_io_req->tx_buf_off;
 920                         }
 921                 /* SCSI read case */
 922                 } else {
 923                         if (orig_io_req->rx_buf_off ==
 924                             orig_io_req->data_xfer_len) {
 925                                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 926                                     "READ - response lost.\n");
 927                                 srr_needed = true;
 928                                 r_ctl = FC_RCTL_DD_CMD_STATUS;
 929                                 offset = 0;
 930                         } else {
 931                                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 932                                     "READ - DATA lost.\n");
 933                                 /*
 934                                  * For read case we always set the offset to 0
 935                                  * for sequence recovery task.
 936                                  */
 937                                 offset = 0;
 938                                 r_ctl = FC_RCTL_DD_SOL_DATA;
 939                         }
 940                 }
 941
 942                 if (srr_needed)
 943                         qedf_send_srr(orig_io_req, offset, r_ctl);
 944                 else
 945                         qedf_initiate_seq_cleanup(orig_io_req, offset, r_ctl);
 946         }
 947
 948 out_free_frame:
 949         fc_frame_free(fp);
 950 out_put:
 951         /* Put reference for original command since REC completed */
 952         kref_put(&orig_io_req->refcount, qedf_release_cmd);
 953 out_free:
 954         kfree(cb_arg);
 955 }
 956
 957 /* Assumes kref is already held by caller */
 958 int qedf_send_rec(struct qedf_ioreq *orig_io_req)
 959 {
 960
 961         struct fc_els_rec rec;
 962         struct qedf_rport *fcport;
 963         struct fc_lport *lport;
 964         struct qedf_els_cb_arg *cb_arg = NULL;
 965         struct qedf_ctx *qedf;
 966         uint32_t sid;
 967         uint32_t r_a_tov;
 968         int rc;
 969
 970         if (!orig_io_req) {
 971                 QEDF_ERR(NULL, "orig_io_req is NULL.\n");
 972                 return -EINVAL;
 973         }
 974
 975         fcport = orig_io_req->fcport;
 976
 977         /* Check that fcport is still offloaded */
 978         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
 979                 QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
 980                 return -EINVAL;
 981         }
 982
 983         if (!fcport->qedf) {
 984                 QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
 985                 return -EINVAL;
 986         }
 987
 988         /* Take reference until REC command completion */
 989         kref_get(&orig_io_req->refcount);
 990
 991         qedf = fcport->qedf;
 992         lport = qedf->lport;
 993         sid = fcport->sid;
 994         r_a_tov = lport->r_a_tov;
 995
 996         memset(&rec, 0, sizeof(rec));
 997
 998         cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 999         if (!cb_arg) {
1000                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
1001                           "REC\n");
1002                 rc = -ENOMEM;
1003                 goto rec_err;
1004         }
1005
1006         cb_arg->aborted_io_req = orig_io_req;
1007
1008         rec.rec_cmd = ELS_REC;
1009         hton24(rec.rec_s_id, sid);
1010         rec.rec_ox_id = htons(orig_io_req->xid);
1011         rec.rec_rx_id =
1012             htons(orig_io_req->task->tstorm_st_context.read_write.rx_id);
1013
1014         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending REC orig_io=%p, "
1015            "orig_xid=0x%x rx_id=0x%x\n", orig_io_req,
1016            orig_io_req->xid, rec.rec_rx_id);
1017         rc = qedf_initiate_els(fcport, ELS_REC, &rec, sizeof(rec),
1018             qedf_rec_compl, cb_arg, r_a_tov);
1019
1020 rec_err:
1021         if (rc) {
1022                 QEDF_ERR(&(qedf->dbg_ctx), "REC failed - release orig_io_req"
1023                           "=0x%x\n", orig_io_req->xid);
1024                 kfree(cb_arg);
1025                 kref_put(&orig_io_req->refcount, qedf_release_cmd);
1026         }
1027         return rc;
1028 }