linux/drivers/scsi/qedf/qedf_els.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  QLogic FCoE Offload Driver
   4 *  Copyright (c) 2016-2018 Cavium Inc.
   5 */
   6#include "qedf.h"
   7
   8/* It's assumed that the lock is held when calling this function. */
   9static int qedf_initiate_els(struct qedf_rport *fcport, unsigned int op,
  10        void *data, uint32_t data_len,
  11        void (*cb_func)(struct qedf_els_cb_arg *cb_arg),
  12        struct qedf_els_cb_arg *cb_arg, uint32_t timer_msec)
  13{
  14        struct qedf_ctx *qedf;
  15        struct fc_lport *lport;
  16        struct qedf_ioreq *els_req;
  17        struct qedf_mp_req *mp_req;
  18        struct fc_frame_header *fc_hdr;
  19        struct e4_fcoe_task_context *task;
  20        int rc = 0;
  21        uint32_t did, sid;
  22        uint16_t xid;
  23        struct fcoe_wqe *sqe;
  24        unsigned long flags;
  25        u16 sqe_idx;
  26
  27        if (!fcport) {
  28                QEDF_ERR(NULL, "fcport is NULL");
  29                rc = -EINVAL;
  30                goto els_err;
  31        }
  32
  33        qedf = fcport->qedf;
  34        lport = qedf->lport;
  35
  36        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending ELS\n");
  37
  38        rc = fc_remote_port_chkready(fcport->rport);
  39        if (rc) {
  40                QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: rport not ready\n", op);
  41                rc = -EAGAIN;
  42                goto els_err;
  43        }
  44        if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
  45                QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: link is not ready\n",
  46                          op);
  47                rc = -EAGAIN;
  48                goto els_err;
  49        }
  50
  51        if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
  52                QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: fcport not ready\n", op);
  53                rc = -EINVAL;
  54                goto els_err;
  55        }
  56
  57        els_req = qedf_alloc_cmd(fcport, QEDF_ELS);
  58        if (!els_req) {
  59                QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_ELS,
  60                          "Failed to alloc ELS request 0x%x\n", op);
  61                rc = -ENOMEM;
  62                goto els_err;
  63        }
  64
  65        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "initiate_els els_req = "
  66                   "0x%p cb_arg = %p xid = %x\n", els_req, cb_arg,
  67                   els_req->xid);
  68        els_req->sc_cmd = NULL;
  69        els_req->cmd_type = QEDF_ELS;
  70        els_req->fcport = fcport;
  71        els_req->cb_func = cb_func;
  72        cb_arg->io_req = els_req;
  73        cb_arg->op = op;
  74        els_req->cb_arg = cb_arg;
  75        els_req->data_xfer_len = data_len;
  76
  77        /* Record which cpu this request is associated with */
  78        els_req->cpu = smp_processor_id();
  79
  80        mp_req = (struct qedf_mp_req *)&(els_req->mp_req);
  81        rc = qedf_init_mp_req(els_req);
  82        if (rc) {
  83                QEDF_ERR(&(qedf->dbg_ctx), "ELS MP request init failed\n");
  84                kref_put(&els_req->refcount, qedf_release_cmd);
  85                goto els_err;
  86        } else {
  87                rc = 0;
  88        }
  89
  90        /* Fill ELS Payload */
  91        if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) {
  92                memcpy(mp_req->req_buf, data, data_len);
  93        } else {
  94                QEDF_ERR(&(qedf->dbg_ctx), "Invalid ELS op 0x%x\n", op);
  95                els_req->cb_func = NULL;
  96                els_req->cb_arg = NULL;
  97                kref_put(&els_req->refcount, qedf_release_cmd);
  98                rc = -EINVAL;
  99        }
 100
 101        if (rc)
 102                goto els_err;
 103
 104        /* Fill FC header */
 105        fc_hdr = &(mp_req->req_fc_hdr);
 106
 107        did = fcport->rdata->ids.port_id;
 108        sid = fcport->sid;
 109
 110        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_ELS_REQ, did, sid,
 111                           FC_TYPE_ELS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 112                           FC_FC_SEQ_INIT, 0);
 113
 114        /* Obtain exchange id */
 115        xid = els_req->xid;
 116
 117        spin_lock_irqsave(&fcport->rport_lock, flags);
 118
 119        sqe_idx = qedf_get_sqe_idx(fcport);
 120        sqe = &fcport->sq[sqe_idx];
 121        memset(sqe, 0, sizeof(struct fcoe_wqe));
 122
 123        /* Initialize task context for this IO request */
 124        task = qedf_get_task_mem(&qedf->tasks, xid);
 125        qedf_init_mp_task(els_req, task, sqe);
 126
 127        /* Put timer on els request */
 128        if (timer_msec)
 129                qedf_cmd_timer_set(qedf, els_req, timer_msec);
 130
 131        /* Ring doorbell */
 132        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Ringing doorbell for ELS "
 133                   "req\n");
 134        qedf_ring_doorbell(fcport);
 135        set_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
 136
 137        spin_unlock_irqrestore(&fcport->rport_lock, flags);
 138els_err:
 139        return rc;
 140}
 141
 142void qedf_process_els_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
 143        struct qedf_ioreq *els_req)
 144{
 145        struct fcoe_cqe_midpath_info *mp_info;
 146        struct qedf_rport *fcport;
 147
 148        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered with xid = 0x%x"
 149                   " cmd_type = %d.\n", els_req->xid, els_req->cmd_type);
 150
 151        if ((els_req->event == QEDF_IOREQ_EV_ELS_FLUSH)
 152                || (els_req->event == QEDF_IOREQ_EV_CLEANUP_SUCCESS)
 153                || (els_req->event == QEDF_IOREQ_EV_CLEANUP_FAILED)) {
 154                QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
 155                        "ELS completion xid=0x%x after flush event=0x%x",
 156                        els_req->xid, els_req->event);
 157                return;
 158        }
 159
 160        fcport = els_req->fcport;
 161
 162        /* When flush is active,
 163         * let the cmds be completed from the cleanup context
 164         */
 165        if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
 166                test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags)) {
 167                QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
 168                        "Dropping ELS completion xid=0x%x as fcport is flushing",
 169                        els_req->xid);
 170                return;
 171        }
 172
 173        clear_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
 174
 175        /* Kill the ELS timer */
 176        cancel_delayed_work(&els_req->timeout_work);
 177
 178        /* Get ELS response length from CQE */
 179        mp_info = &cqe->cqe_info.midpath_info;
 180        els_req->mp_req.resp_len = mp_info->data_placement_size;
 181
 182        /* Parse ELS response */
 183        if ((els_req->cb_func) && (els_req->cb_arg)) {
 184                els_req->cb_func(els_req->cb_arg);
 185                els_req->cb_arg = NULL;
 186        }
 187
 188        kref_put(&els_req->refcount, qedf_release_cmd);
 189}
 190
 191static void qedf_rrq_compl(struct qedf_els_cb_arg *cb_arg)
 192{
 193        struct qedf_ioreq *orig_io_req;
 194        struct qedf_ioreq *rrq_req;
 195        struct qedf_ctx *qedf;
 196        int refcount;
 197
 198        rrq_req = cb_arg->io_req;
 199        qedf = rrq_req->fcport->qedf;
 200
 201        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered.\n");
 202
 203        orig_io_req = cb_arg->aborted_io_req;
 204
 205        if (!orig_io_req) {
 206                QEDF_ERR(&qedf->dbg_ctx,
 207                         "Original io_req is NULL, rrq_req = %p.\n", rrq_req);
 208                goto out_free;
 209        }
 210
 211        refcount = kref_read(&orig_io_req->refcount);
 212        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "rrq_compl: orig io = %p,"
 213                   " orig xid = 0x%x, rrq_xid = 0x%x, refcount=%d\n",
 214                   orig_io_req, orig_io_req->xid, rrq_req->xid, refcount);
 215
 216        /*
 217         * This should return the aborted io_req to the command pool. Note that
 218         * we need to check the refcound in case the original request was
 219         * flushed but we get a completion on this xid.
 220         */
 221        if (orig_io_req && refcount > 0)
 222                kref_put(&orig_io_req->refcount, qedf_release_cmd);
 223
 224out_free:
 225        /*
 226         * Release a reference to the rrq request if we timed out as the
 227         * rrq completion handler is called directly from the timeout handler
 228         * and not from els_compl where the reference would have normally been
 229         * released.
 230         */
 231        if (rrq_req->event == QEDF_IOREQ_EV_ELS_TMO)
 232                kref_put(&rrq_req->refcount, qedf_release_cmd);
 233        kfree(cb_arg);
 234}
 235
 236/* Assumes kref is already held by caller */
 237int qedf_send_rrq(struct qedf_ioreq *aborted_io_req)
 238{
 239
 240        struct fc_els_rrq rrq;
 241        struct qedf_rport *fcport;
 242        struct fc_lport *lport;
 243        struct qedf_els_cb_arg *cb_arg = NULL;
 244        struct qedf_ctx *qedf;
 245        uint32_t sid;
 246        uint32_t r_a_tov;
 247        int rc;
 248        int refcount;
 249
 250        if (!aborted_io_req) {
 251                QEDF_ERR(NULL, "abort_io_req is NULL.\n");
 252                return -EINVAL;
 253        }
 254
 255        fcport = aborted_io_req->fcport;
 256
 257        if (!fcport) {
 258                refcount = kref_read(&aborted_io_req->refcount);
 259                QEDF_ERR(NULL,
 260                         "RRQ work was queued prior to a flush xid=0x%x, refcount=%d.\n",
 261                         aborted_io_req->xid, refcount);
 262                kref_put(&aborted_io_req->refcount, qedf_release_cmd);
 263                return -EINVAL;
 264        }
 265
 266        /* Check that fcport is still offloaded */
 267        if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
 268                QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
 269                return -EINVAL;
 270        }
 271
 272        if (!fcport->qedf) {
 273                QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
 274                return -EINVAL;
 275        }
 276
 277        qedf = fcport->qedf;
 278
 279        /*
 280         * Sanity check that we can send a RRQ to make sure that refcount isn't
 281         * 0
 282         */
 283        refcount = kref_read(&aborted_io_req->refcount);
 284        if (refcount != 1) {
 285                QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_ELS,
 286                          "refcount for xid=%x io_req=%p refcount=%d is not 1.\n",
 287                          aborted_io_req->xid, aborted_io_req, refcount);
 288                return -EINVAL;
 289        }
 290
 291        lport = qedf->lport;
 292        sid = fcport->sid;
 293        r_a_tov = lport->r_a_tov;
 294
 295        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending RRQ orig "
 296                   "io = %p, orig_xid = 0x%x\n", aborted_io_req,
 297                   aborted_io_req->xid);
 298        memset(&rrq, 0, sizeof(rrq));
 299
 300        cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 301        if (!cb_arg) {
 302                QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
 303                          "RRQ\n");
 304                rc = -ENOMEM;
 305                goto rrq_err;
 306        }
 307
 308        cb_arg->aborted_io_req = aborted_io_req;
 309
 310        rrq.rrq_cmd = ELS_RRQ;
 311        hton24(rrq.rrq_s_id, sid);
 312        rrq.rrq_ox_id = htons(aborted_io_req->xid);
 313        rrq.rrq_rx_id =
 314            htons(aborted_io_req->task->tstorm_st_context.read_write.rx_id);
 315
 316        rc = qedf_initiate_els(fcport, ELS_RRQ, &rrq, sizeof(rrq),
 317            qedf_rrq_compl, cb_arg, r_a_tov);
 318
 319rrq_err:
 320        if (rc) {
 321                QEDF_ERR(&(qedf->dbg_ctx), "RRQ failed - release orig io "
 322                          "req 0x%x\n", aborted_io_req->xid);
 323                kfree(cb_arg);
 324                kref_put(&aborted_io_req->refcount, qedf_release_cmd);
 325        }
 326        return rc;
 327}
 328
 329static void qedf_process_l2_frame_compl(struct qedf_rport *fcport,
 330                                        struct fc_frame *fp,
 331                                        u16 l2_oxid)
 332{
 333        struct fc_lport *lport = fcport->qedf->lport;
 334        struct fc_frame_header *fh;
 335        u32 crc;
 336
 337        fh = (struct fc_frame_header *)fc_frame_header_get(fp);
 338
 339        /* Set the OXID we return to what libfc used */
 340        if (l2_oxid != FC_XID_UNKNOWN)
 341                fh->fh_ox_id = htons(l2_oxid);
 342
 343        /* Setup header fields */
 344        fh->fh_r_ctl = FC_RCTL_ELS_REP;
 345        fh->fh_type = FC_TYPE_ELS;
 346        /* Last sequence, end sequence */
 347        fh->fh_f_ctl[0] = 0x98;
 348        hton24(fh->fh_d_id, lport->port_id);
 349        hton24(fh->fh_s_id, fcport->rdata->ids.port_id);
 350        fh->fh_rx_id = 0xffff;
 351
 352        /* Set frame attributes */
 353        crc = fcoe_fc_crc(fp);
 354        fc_frame_init(fp);
 355        fr_dev(fp) = lport;
 356        fr_sof(fp) = FC_SOF_I3;
 357        fr_eof(fp) = FC_EOF_T;
 358        fr_crc(fp) = cpu_to_le32(~crc);
 359
 360        /* Send completed request to libfc */
 361        fc_exch_recv(lport, fp);
 362}
 363
 364/*
 365 * In instances where an ELS command times out we may need to restart the
 366 * rport by logging out and then logging back in.
 367 */
 368void qedf_restart_rport(struct qedf_rport *fcport)
 369{
 370        struct fc_lport *lport;
 371        struct fc_rport_priv *rdata;
 372        u32 port_id;
 373        unsigned long flags;
 374
 375        if (!fcport) {
 376                QEDF_ERR(NULL, "fcport is NULL.\n");
 377                return;
 378        }
 379
 380        spin_lock_irqsave(&fcport->rport_lock, flags);
 381        if (test_bit(QEDF_RPORT_IN_RESET, &fcport->flags) ||
 382            !test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
 383            test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
 384                QEDF_ERR(&(fcport->qedf->dbg_ctx), "fcport %p already in reset or not offloaded.\n",
 385                    fcport);
 386                spin_unlock_irqrestore(&fcport->rport_lock, flags);
 387                return;
 388        }
 389
 390        /* Set that we are now in reset */
 391        set_bit(QEDF_RPORT_IN_RESET, &fcport->flags);
 392        spin_unlock_irqrestore(&fcport->rport_lock, flags);
 393
 394        rdata = fcport->rdata;
 395        if (rdata && !kref_get_unless_zero(&rdata->kref)) {
 396                fcport->rdata = NULL;
 397                rdata = NULL;
 398        }
 399
 400        if (rdata && rdata->rp_state == RPORT_ST_READY) {
 401                lport = fcport->qedf->lport;
 402                port_id = rdata->ids.port_id;
 403                QEDF_ERR(&(fcport->qedf->dbg_ctx),
 404                    "LOGO port_id=%x.\n", port_id);
 405                fc_rport_logoff(rdata);
 406                kref_put(&rdata->kref, fc_rport_destroy);
 407                mutex_lock(&lport->disc.disc_mutex);
 408                /* Recreate the rport and log back in */
 409                rdata = fc_rport_create(lport, port_id);
 410                mutex_unlock(&lport->disc.disc_mutex);
 411                if (rdata)
 412                        fc_rport_login(rdata);
 413                fcport->rdata = rdata;
 414        }
 415        clear_bit(QEDF_RPORT_IN_RESET, &fcport->flags);
 416}
 417
 418static void qedf_l2_els_compl(struct qedf_els_cb_arg *cb_arg)
 419{
 420        struct qedf_ioreq *els_req;
 421        struct qedf_rport *fcport;
 422        struct qedf_mp_req *mp_req;
 423        struct fc_frame *fp;
 424        struct fc_frame_header *fh, *mp_fc_hdr;
 425        void *resp_buf, *fc_payload;
 426        u32 resp_len;
 427        u16 l2_oxid;
 428
 429        l2_oxid = cb_arg->l2_oxid;
 430        els_req = cb_arg->io_req;
 431
 432        if (!els_req) {
 433                QEDF_ERR(NULL, "els_req is NULL.\n");
 434                goto free_arg;
 435        }
 436
 437        /*
 438         * If we are flushing the command just free the cb_arg as none of the
 439         * response data will be valid.
 440         */
 441        if (els_req->event == QEDF_IOREQ_EV_ELS_FLUSH) {
 442                QEDF_ERR(NULL, "els_req xid=0x%x event is flush.\n",
 443                         els_req->xid);
 444                goto free_arg;
 445        }
 446
 447        fcport = els_req->fcport;
 448        mp_req = &(els_req->mp_req);
 449        mp_fc_hdr = &(mp_req->resp_fc_hdr);
 450        resp_len = mp_req->resp_len;
 451        resp_buf = mp_req->resp_buf;
 452
 453        /*
 454         * If a middle path ELS command times out, don't try to return
 455         * the command but rather do any internal cleanup and then libfc
 456         * timeout the command and clean up its internal resources.
 457         */
 458        if (els_req->event == QEDF_IOREQ_EV_ELS_TMO) {
 459                /*
 460                 * If ADISC times out, libfc will timeout the exchange and then
 461                 * try to send a PLOGI which will timeout since the session is
 462                 * still offloaded.  Force libfc to logout the session which
 463                 * will offload the connection and allow the PLOGI response to
 464                 * flow over the LL2 path.
 465                 */
 466                if (cb_arg->op == ELS_ADISC)
 467                        qedf_restart_rport(fcport);
 468                return;
 469        }
 470
 471        if (sizeof(struct fc_frame_header) + resp_len > QEDF_PAGE_SIZE) {
 472                QEDF_ERR(&(fcport->qedf->dbg_ctx), "resp_len is "
 473                   "beyond page size.\n");
 474                goto free_arg;
 475        }
 476
 477        fp = fc_frame_alloc(fcport->qedf->lport, resp_len);
 478        if (!fp) {
 479                QEDF_ERR(&(fcport->qedf->dbg_ctx),
 480                    "fc_frame_alloc failure.\n");
 481                return;
 482        }
 483
 484        /* Copy frame header from firmware into fp */
 485        fh = (struct fc_frame_header *)fc_frame_header_get(fp);
 486        memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));
 487
 488        /* Copy payload from firmware into fp */
 489        fc_payload = fc_frame_payload_get(fp, resp_len);
 490        memcpy(fc_payload, resp_buf, resp_len);
 491
 492        QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
 493            "Completing OX_ID 0x%x back to libfc.\n", l2_oxid);
 494        qedf_process_l2_frame_compl(fcport, fp, l2_oxid);
 495
 496free_arg:
 497        kfree(cb_arg);
 498}
 499
 500int qedf_send_adisc(struct qedf_rport *fcport, struct fc_frame *fp)
 501{
 502        struct fc_els_adisc *adisc;
 503        struct fc_frame_header *fh;
 504        struct fc_lport *lport = fcport->qedf->lport;
 505        struct qedf_els_cb_arg *cb_arg = NULL;
 506        struct qedf_ctx *qedf;
 507        uint32_t r_a_tov = lport->r_a_tov;
 508        int rc;
 509
 510        qedf = fcport->qedf;
 511        fh = fc_frame_header_get(fp);
 512
 513        cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 514        if (!cb_arg) {
 515                QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
 516                          "ADISC\n");
 517                rc = -ENOMEM;
 518                goto adisc_err;
 519        }
 520        cb_arg->l2_oxid = ntohs(fh->fh_ox_id);
 521
 522        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 523            "Sending ADISC ox_id=0x%x.\n", cb_arg->l2_oxid);
 524
 525        adisc = fc_frame_payload_get(fp, sizeof(*adisc));
 526
 527        rc = qedf_initiate_els(fcport, ELS_ADISC, adisc, sizeof(*adisc),
 528            qedf_l2_els_compl, cb_arg, r_a_tov);
 529
 530adisc_err:
 531        if (rc) {
 532                QEDF_ERR(&(qedf->dbg_ctx), "ADISC failed.\n");
 533                kfree(cb_arg);
 534        }
 535        return rc;
 536}
 537
 538static void qedf_srr_compl(struct qedf_els_cb_arg *cb_arg)
 539{
 540        struct qedf_ioreq *orig_io_req;
 541        struct qedf_ioreq *srr_req;
 542        struct qedf_mp_req *mp_req;
 543        struct fc_frame_header *mp_fc_hdr, *fh;
 544        struct fc_frame *fp;
 545        void *resp_buf, *fc_payload;
 546        u32 resp_len;
 547        struct fc_lport *lport;
 548        struct qedf_ctx *qedf;
 549        int refcount;
 550        u8 opcode;
 551
 552        srr_req = cb_arg->io_req;
 553        qedf = srr_req->fcport->qedf;
 554        lport = qedf->lport;
 555
 556        orig_io_req = cb_arg->aborted_io_req;
 557
 558        if (!orig_io_req) {
 559                QEDF_ERR(NULL, "orig_io_req is NULL.\n");
 560                goto out_free;
 561        }
 562
 563        clear_bit(QEDF_CMD_SRR_SENT, &orig_io_req->flags);
 564
 565        if (srr_req->event != QEDF_IOREQ_EV_ELS_TMO &&
 566            srr_req->event != QEDF_IOREQ_EV_ELS_ERR_DETECT)
 567                cancel_delayed_work_sync(&orig_io_req->timeout_work);
 568
 569        refcount = kref_read(&orig_io_req->refcount);
 570        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered: orig_io=%p,"
 571                   " orig_io_xid=0x%x, rec_xid=0x%x, refcount=%d\n",
 572                   orig_io_req, orig_io_req->xid, srr_req->xid, refcount);
 573
 574        /* If a SRR times out, simply free resources */
 575        if (srr_req->event == QEDF_IOREQ_EV_ELS_TMO) {
 576                QEDF_ERR(&qedf->dbg_ctx,
 577                         "ELS timeout rec_xid=0x%x.\n", srr_req->xid);
 578                goto out_put;
 579        }
 580
 581        /* Normalize response data into struct fc_frame */
 582        mp_req = &(srr_req->mp_req);
 583        mp_fc_hdr = &(mp_req->resp_fc_hdr);
 584        resp_len = mp_req->resp_len;
 585        resp_buf = mp_req->resp_buf;
 586
 587        fp = fc_frame_alloc(lport, resp_len);
 588        if (!fp) {
 589                QEDF_ERR(&(qedf->dbg_ctx),
 590                    "fc_frame_alloc failure.\n");
 591                goto out_put;
 592        }
 593
 594        /* Copy frame header from firmware into fp */
 595        fh = (struct fc_frame_header *)fc_frame_header_get(fp);
 596        memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));
 597
 598        /* Copy payload from firmware into fp */
 599        fc_payload = fc_frame_payload_get(fp, resp_len);
 600        memcpy(fc_payload, resp_buf, resp_len);
 601
 602        opcode = fc_frame_payload_op(fp);
 603        switch (opcode) {
 604        case ELS_LS_ACC:
 605                QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 606                    "SRR success.\n");
 607                break;
 608        case ELS_LS_RJT:
 609                QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_ELS,
 610                    "SRR rejected.\n");
 611                qedf_initiate_abts(orig_io_req, true);
 612                break;
 613        }
 614
 615        fc_frame_free(fp);
 616out_put:
 617        /* Put reference for original command since SRR completed */
 618        kref_put(&orig_io_req->refcount, qedf_release_cmd);
 619out_free:
 620        kfree(cb_arg);
 621}
 622
 623static int qedf_send_srr(struct qedf_ioreq *orig_io_req, u32 offset, u8 r_ctl)
 624{
 625        struct fcp_srr srr;
 626        struct qedf_ctx *qedf;
 627        struct qedf_rport *fcport;
 628        struct fc_lport *lport;
 629        struct qedf_els_cb_arg *cb_arg = NULL;
 630        u32 r_a_tov;
 631        int rc;
 632
 633        if (!orig_io_req) {
 634                QEDF_ERR(NULL, "orig_io_req is NULL.\n");
 635                return -EINVAL;
 636        }
 637
 638        fcport = orig_io_req->fcport;
 639
 640        /* Check that fcport is still offloaded */
 641        if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
 642                QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
 643                return -EINVAL;
 644        }
 645
 646        if (!fcport->qedf) {
 647                QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
 648                return -EINVAL;
 649        }
 650
 651        /* Take reference until SRR command completion */
 652        kref_get(&orig_io_req->refcount);
 653
 654        qedf = fcport->qedf;
 655        lport = qedf->lport;
 656        r_a_tov = lport->r_a_tov;
 657
 658        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending SRR orig_io=%p, "
 659                   "orig_xid=0x%x\n", orig_io_req, orig_io_req->xid);
 660        memset(&srr, 0, sizeof(srr));
 661
 662        cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 663        if (!cb_arg) {
 664                QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
 665                          "SRR\n");
 666                rc = -ENOMEM;
 667                goto srr_err;
 668        }
 669
 670        cb_arg->aborted_io_req = orig_io_req;
 671
 672        srr.srr_op = ELS_SRR;
 673        srr.srr_ox_id = htons(orig_io_req->xid);
 674        srr.srr_rx_id = htons(orig_io_req->rx_id);
 675        srr.srr_rel_off = htonl(offset);
 676        srr.srr_r_ctl = r_ctl;
 677
 678        rc = qedf_initiate_els(fcport, ELS_SRR, &srr, sizeof(srr),
 679            qedf_srr_compl, cb_arg, r_a_tov);
 680
 681srr_err:
 682        if (rc) {
 683                QEDF_ERR(&(qedf->dbg_ctx), "SRR failed - release orig_io_req"
 684                          "=0x%x\n", orig_io_req->xid);
 685                kfree(cb_arg);
 686                /* If we fail to queue SRR, send ABTS to orig_io */
 687                qedf_initiate_abts(orig_io_req, true);
 688                kref_put(&orig_io_req->refcount, qedf_release_cmd);
 689        } else
 690                /* Tell other threads that SRR is in progress */
 691                set_bit(QEDF_CMD_SRR_SENT, &orig_io_req->flags);
 692
 693        return rc;
 694}
 695
 696static void qedf_initiate_seq_cleanup(struct qedf_ioreq *orig_io_req,
 697        u32 offset, u8 r_ctl)
 698{
 699        struct qedf_rport *fcport;
 700        unsigned long flags;
 701        struct qedf_els_cb_arg *cb_arg;
 702        struct fcoe_wqe *sqe;
 703        u16 sqe_idx;
 704
 705        fcport = orig_io_req->fcport;
 706
 707        QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
 708            "Doing sequence cleanup for xid=0x%x offset=%u.\n",
 709            orig_io_req->xid, offset);
 710
 711        cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
 712        if (!cb_arg) {
 713                QEDF_ERR(&(fcport->qedf->dbg_ctx), "Unable to allocate cb_arg "
 714                          "for sequence cleanup\n");
 715                return;
 716        }
 717
 718        /* Get reference for cleanup request */
 719        kref_get(&orig_io_req->refcount);
 720
 721        orig_io_req->cmd_type = QEDF_SEQ_CLEANUP;
 722        cb_arg->offset = offset;
 723        cb_arg->r_ctl = r_ctl;
 724        orig_io_req->cb_arg = cb_arg;
 725
 726        qedf_cmd_timer_set(fcport->qedf, orig_io_req,
 727            QEDF_CLEANUP_TIMEOUT * HZ);
 728
 729        spin_lock_irqsave(&fcport->rport_lock, flags);
 730
 731        sqe_idx = qedf_get_sqe_idx(fcport);
 732        sqe = &fcport->sq[sqe_idx];
 733        memset(sqe, 0, sizeof(struct fcoe_wqe));
 734        orig_io_req->task_params->sqe = sqe;
 735
 736        init_initiator_sequence_recovery_fcoe_task(orig_io_req->task_params,
 737                                                   offset);
 738        qedf_ring_doorbell(fcport);
 739
 740        spin_unlock_irqrestore(&fcport->rport_lock, flags);
 741}
 742
 743void qedf_process_seq_cleanup_compl(struct qedf_ctx *qedf,
 744        struct fcoe_cqe *cqe, struct qedf_ioreq *io_req)
 745{
 746        int rc;
 747        struct qedf_els_cb_arg *cb_arg;
 748
 749        cb_arg = io_req->cb_arg;
 750
 751        /* If we timed out just free resources */
 752        if (io_req->event == QEDF_IOREQ_EV_ELS_TMO || !cqe) {
 753                QEDF_ERR(&qedf->dbg_ctx,
 754                         "cqe is NULL or timeout event (0x%x)", io_req->event);
 755                goto free;
 756        }
 757
 758        /* Kill the timer we put on the request */
 759        cancel_delayed_work_sync(&io_req->timeout_work);
 760
 761        rc = qedf_send_srr(io_req, cb_arg->offset, cb_arg->r_ctl);
 762        if (rc)
 763                QEDF_ERR(&(qedf->dbg_ctx), "Unable to send SRR, I/O will "
 764                    "abort, xid=0x%x.\n", io_req->xid);
 765free:
 766        kfree(cb_arg);
 767        kref_put(&io_req->refcount, qedf_release_cmd);
 768}
 769
 770static bool qedf_requeue_io_req(struct qedf_ioreq *orig_io_req)
 771{
 772        struct qedf_rport *fcport;
 773        struct qedf_ioreq *new_io_req;
 774        unsigned long flags;
 775        bool rc = false;
 776
 777        fcport = orig_io_req->fcport;
 778        if (!fcport) {
 779                QEDF_ERR(NULL, "fcport is NULL.\n");
 780                goto out;
 781        }
 782
 783        if (!orig_io_req->sc_cmd) {
 784                QEDF_ERR(&(fcport->qedf->dbg_ctx), "sc_cmd is NULL for "
 785                    "xid=0x%x.\n", orig_io_req->xid);
 786                goto out;
 787        }
 788
 789        new_io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
 790        if (!new_io_req) {
 791                QEDF_ERR(&(fcport->qedf->dbg_ctx), "Could not allocate new "
 792                    "io_req.\n");
 793                goto out;
 794        }
 795
 796        new_io_req->sc_cmd = orig_io_req->sc_cmd;
 797
 798        /*
 799         * This keeps the sc_cmd struct from being returned to the tape
 800         * driver and being requeued twice. We do need to put a reference
 801         * for the original I/O request since we will not do a SCSI completion
 802         * for it.
 803         */
 804        orig_io_req->sc_cmd = NULL;
 805        kref_put(&orig_io_req->refcount, qedf_release_cmd);
 806
 807        spin_lock_irqsave(&fcport->rport_lock, flags);
 808
 809        /* kref for new command released in qedf_post_io_req on error */
 810        if (qedf_post_io_req(fcport, new_io_req)) {
 811                QEDF_ERR(&(fcport->qedf->dbg_ctx), "Unable to post io_req\n");
 812                /* Return SQE to pool */
 813                atomic_inc(&fcport->free_sqes);
 814        } else {
 815                QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
 816                    "Reissued SCSI command from  orig_xid=0x%x on "
 817                    "new_xid=0x%x.\n", orig_io_req->xid, new_io_req->xid);
 818                /*
 819                 * Abort the original I/O but do not return SCSI command as
 820                 * it has been reissued on another OX_ID.
 821                 */
 822                spin_unlock_irqrestore(&fcport->rport_lock, flags);
 823                qedf_initiate_abts(orig_io_req, false);
 824                goto out;
 825        }
 826
 827        spin_unlock_irqrestore(&fcport->rport_lock, flags);
 828out:
 829        return rc;
 830}
 831
 832
 833static void qedf_rec_compl(struct qedf_els_cb_arg *cb_arg)
 834{
 835        struct qedf_ioreq *orig_io_req;
 836        struct qedf_ioreq *rec_req;
 837        struct qedf_mp_req *mp_req;
 838        struct fc_frame_header *mp_fc_hdr, *fh;
 839        struct fc_frame *fp;
 840        void *resp_buf, *fc_payload;
 841        u32 resp_len;
 842        struct fc_lport *lport;
 843        struct qedf_ctx *qedf;
 844        int refcount;
 845        enum fc_rctl r_ctl;
 846        struct fc_els_ls_rjt *rjt;
 847        struct fc_els_rec_acc *acc;
 848        u8 opcode;
 849        u32 offset, e_stat;
 850        struct scsi_cmnd *sc_cmd;
 851        bool srr_needed = false;
 852
 853        rec_req = cb_arg->io_req;
 854        qedf = rec_req->fcport->qedf;
 855        lport = qedf->lport;
 856
 857        orig_io_req = cb_arg->aborted_io_req;
 858
 859        if (!orig_io_req) {
 860                QEDF_ERR(NULL, "orig_io_req is NULL.\n");
 861                goto out_free;
 862        }
 863
 864        if (rec_req->event != QEDF_IOREQ_EV_ELS_TMO &&
 865            rec_req->event != QEDF_IOREQ_EV_ELS_ERR_DETECT)
 866                cancel_delayed_work_sync(&orig_io_req->timeout_work);
 867
 868        refcount = kref_read(&orig_io_req->refcount);
 869        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered: orig_io=%p,"
 870                   " orig_io_xid=0x%x, rec_xid=0x%x, refcount=%d\n",
 871                   orig_io_req, orig_io_req->xid, rec_req->xid, refcount);
 872
 873        /* If a REC times out, free resources */
 874        if (rec_req->event == QEDF_IOREQ_EV_ELS_TMO) {
 875                QEDF_ERR(&qedf->dbg_ctx,
 876                         "Got TMO event, orig_io_req %p orig_io_xid=0x%x.\n",
 877                         orig_io_req, orig_io_req->xid);
 878                goto out_put;
 879        }
 880
 881        /* Normalize response data into struct fc_frame */
 882        mp_req = &(rec_req->mp_req);
 883        mp_fc_hdr = &(mp_req->resp_fc_hdr);
 884        resp_len = mp_req->resp_len;
 885        acc = resp_buf = mp_req->resp_buf;
 886
 887        fp = fc_frame_alloc(lport, resp_len);
 888        if (!fp) {
 889                QEDF_ERR(&(qedf->dbg_ctx),
 890                    "fc_frame_alloc failure.\n");
 891                goto out_put;
 892        }
 893
 894        /* Copy frame header from firmware into fp */
 895        fh = (struct fc_frame_header *)fc_frame_header_get(fp);
 896        memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));
 897
 898        /* Copy payload from firmware into fp */
 899        fc_payload = fc_frame_payload_get(fp, resp_len);
 900        memcpy(fc_payload, resp_buf, resp_len);
 901
 902        opcode = fc_frame_payload_op(fp);
 903        if (opcode == ELS_LS_RJT) {
 904                rjt = fc_frame_payload_get(fp, sizeof(*rjt));
 905                if (!rjt) {
 906                        QEDF_ERR(&qedf->dbg_ctx, "payload get failed");
 907                        goto out_free_frame;
 908                }
 909
 910                QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 911                    "Received LS_RJT for REC: er_reason=0x%x, "
 912                    "er_explan=0x%x.\n", rjt->er_reason, rjt->er_explan);
 913                /*
 914                 * The following response(s) mean that we need to reissue the
 915                 * request on another exchange.  We need to do this without
 916                 * informing the upper layers lest it cause an application
 917                 * error.
 918                 */
 919                if ((rjt->er_reason == ELS_RJT_LOGIC ||
 920                    rjt->er_reason == ELS_RJT_UNAB) &&
 921                    rjt->er_explan == ELS_EXPL_OXID_RXID) {
 922                        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 923                            "Handle CMD LOST case.\n");
 924                        qedf_requeue_io_req(orig_io_req);
 925                }
 926        } else if (opcode == ELS_LS_ACC) {
 927                offset = ntohl(acc->reca_fc4value);
 928                e_stat = ntohl(acc->reca_e_stat);
 929                QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 930                    "Received LS_ACC for REC: offset=0x%x, e_stat=0x%x.\n",
 931                    offset, e_stat);
 932                if (e_stat & ESB_ST_SEQ_INIT)  {
 933                        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 934                            "Target has the seq init\n");
 935                        goto out_free_frame;
 936                }
 937                sc_cmd = orig_io_req->sc_cmd;
 938                if (!sc_cmd) {
 939                        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 940                            "sc_cmd is NULL for xid=0x%x.\n",
 941                            orig_io_req->xid);
 942                        goto out_free_frame;
 943                }
 944                /* SCSI write case */
 945                if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
 946                        if (offset == orig_io_req->data_xfer_len) {
 947                                QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 948                                    "WRITE - response lost.\n");
 949                                r_ctl = FC_RCTL_DD_CMD_STATUS;
 950                                srr_needed = true;
 951                                offset = 0;
 952                        } else {
 953                                QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 954                                    "WRITE - XFER_RDY/DATA lost.\n");
 955                                r_ctl = FC_RCTL_DD_DATA_DESC;
 956                                /* Use data from warning CQE instead of REC */
 957                                offset = orig_io_req->tx_buf_off;
 958                        }
 959                /* SCSI read case */
 960                } else {
 961                        if (orig_io_req->rx_buf_off ==
 962                            orig_io_req->data_xfer_len) {
 963                                QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 964                                    "READ - response lost.\n");
 965                                srr_needed = true;
 966                                r_ctl = FC_RCTL_DD_CMD_STATUS;
 967                                offset = 0;
 968                        } else {
 969                                QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
 970                                    "READ - DATA lost.\n");
 971                                /*
 972                                 * For read case we always set the offset to 0
 973                                 * for sequence recovery task.
 974                                 */
 975                                offset = 0;
 976                                r_ctl = FC_RCTL_DD_SOL_DATA;
 977                        }
 978                }
 979
 980                if (srr_needed)
 981                        qedf_send_srr(orig_io_req, offset, r_ctl);
 982                else
 983                        qedf_initiate_seq_cleanup(orig_io_req, offset, r_ctl);
 984        }
 985
 986out_free_frame:
 987        fc_frame_free(fp);
 988out_put:
 989        /* Put reference for original command since REC completed */
 990        kref_put(&orig_io_req->refcount, qedf_release_cmd);
 991out_free:
 992        kfree(cb_arg);
 993}
 994
 995/* Assumes kref is already held by caller */
 996int qedf_send_rec(struct qedf_ioreq *orig_io_req)
 997{
 998
 999        struct fc_els_rec rec;
1000        struct qedf_rport *fcport;
1001        struct fc_lport *lport;
1002        struct qedf_els_cb_arg *cb_arg = NULL;
1003        struct qedf_ctx *qedf;
1004        uint32_t sid;
1005        uint32_t r_a_tov;
1006        int rc;
1007
1008        if (!orig_io_req) {
1009                QEDF_ERR(NULL, "orig_io_req is NULL.\n");
1010                return -EINVAL;
1011        }
1012
1013        fcport = orig_io_req->fcport;
1014
1015        /* Check that fcport is still offloaded */
1016        if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1017                QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
1018                return -EINVAL;
1019        }
1020
1021        if (!fcport->qedf) {
1022                QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
1023                return -EINVAL;
1024        }
1025
1026        /* Take reference until REC command completion */
1027        kref_get(&orig_io_req->refcount);
1028
1029        qedf = fcport->qedf;
1030        lport = qedf->lport;
1031        sid = fcport->sid;
1032        r_a_tov = lport->r_a_tov;
1033
1034        memset(&rec, 0, sizeof(rec));
1035
1036        cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
1037        if (!cb_arg) {
1038                QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
1039                          "REC\n");
1040                rc = -ENOMEM;
1041                goto rec_err;
1042        }
1043
1044        cb_arg->aborted_io_req = orig_io_req;
1045
1046        rec.rec_cmd = ELS_REC;
1047        hton24(rec.rec_s_id, sid);
1048        rec.rec_ox_id = htons(orig_io_req->xid);
1049        rec.rec_rx_id =
1050            htons(orig_io_req->task->tstorm_st_context.read_write.rx_id);
1051
1052        QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending REC orig_io=%p, "
1053           "orig_xid=0x%x rx_id=0x%x\n", orig_io_req,
1054           orig_io_req->xid, rec.rec_rx_id);
1055        rc = qedf_initiate_els(fcport, ELS_REC, &rec, sizeof(rec),
1056            qedf_rec_compl, cb_arg, r_a_tov);
1057
1058rec_err:
1059        if (rc) {
1060                QEDF_ERR(&(qedf->dbg_ctx), "REC failed - release orig_io_req"
1061                          "=0x%x\n", orig_io_req->xid);
1062                kfree(cb_arg);
1063                kref_put(&orig_io_req->refcount, qedf_release_cmd);
1064        }
1065        return rc;
1066}
1067