drivers/scsi/libfc/fc

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This source file includes following definitions.
fc_fcp_pkt_alloc
fc_fcp_pkt_release
fc_fcp_pkt_hold
fc_fcp_pkt_destroy
fc_fcp_lock_pkt
fc_fcp_unlock_pkt
fc_fcp_timer_set
fc_fcp_abort_done
fc_fcp_send_abort
fc_fcp_retry_cmd
fc_fcp_ddp_setup
fc_fcp_ddp_done
fc_fcp_can_queue_ramp_up
fc_fcp_can_queue_ramp_down
fc_fcp_frame_alloc
get_fsp_rec_tov
fc_fcp_recv_data
fc_fcp_send_data
fc_fcp_abts_resp
fc_fcp_recv
fc_fcp_resp
fc_fcp_complete_locked
fc_fcp_cleanup_cmd
fc_fcp_cleanup_each_cmd
fc_fcp_abort_io
fc_fcp_pkt_send
fc_fcp_cmd_send
fc_fcp_error
fc_fcp_pkt_abort
fc_lun_reset_send
fc_lun_reset
fc_tm_done
fc_fcp_cleanup
fc_fcp_timeout
fc_fcp_rec
fc_fcp_rec_resp
fc_fcp_rec_error
fc_fcp_recovery
fc_fcp_srr
fc_fcp_srr_resp
fc_fcp_srr_error
fc_fcp_lport_queue_ready
fc_queuecommand
fc_io_compl
fc_eh_abort
fc_eh_device_reset
fc_eh_host_reset
fc_slave_alloc
fc_fcp_destroy
fc_setup_fcp
fc_destroy_fcp
fc_fcp_init
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright(c) 2007 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2008 Red Hat, Inc.  All rights reserved.
   5  * Copyright(c) 2008 Mike Christie
   6  *
   7  * Maintained at www.Open-FCoE.org
   8  */
   9 
  10 #include <linux/module.h>
  11 #include <linux/delay.h>
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/scatterlist.h>
  16 #include <linux/err.h>
  17 #include <linux/crc32.h>
  18 #include <linux/slab.h>
  19 
  20 #include <scsi/scsi_tcq.h>
  21 #include <scsi/scsi.h>
  22 #include <scsi/scsi_host.h>
  23 #include <scsi/scsi_device.h>
  24 #include <scsi/scsi_cmnd.h>
  25 
  26 #include <scsi/fc/fc_fc2.h>
  27 
  28 #include <scsi/libfc.h>
  29 #include <scsi/fc_encode.h>
  30 
  31 #include "fc_libfc.h"
  32 
  33 static struct kmem_cache *scsi_pkt_cachep;
  34 
  35 /* SRB state definitions */
  36 #define FC_SRB_FREE             0               /* cmd is free */
  37 #define FC_SRB_CMD_SENT         (1 << 0)        /* cmd has been sent */
  38 #define FC_SRB_RCV_STATUS       (1 << 1)        /* response has arrived */
  39 #define FC_SRB_ABORT_PENDING    (1 << 2)        /* cmd abort sent to device */
  40 #define FC_SRB_ABORTED          (1 << 3)        /* abort acknowledged */
  41 #define FC_SRB_DISCONTIG        (1 << 4)        /* non-sequential data recvd */
  42 #define FC_SRB_COMPL            (1 << 5)        /* fc_io_compl has been run */
  43 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6)      /* timer function processing */
  44 
  45 #define FC_SRB_READ             (1 << 1)
  46 #define FC_SRB_WRITE            (1 << 0)
  47 
  48 /*
  49  * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
  50  */
  51 #define CMD_SP(Cmnd)                ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
  52 #define CMD_ENTRY_STATUS(Cmnd)      ((Cmnd)->SCp.have_data_in)
  53 #define CMD_COMPL_STATUS(Cmnd)      ((Cmnd)->SCp.this_residual)
  54 #define CMD_SCSI_STATUS(Cmnd)       ((Cmnd)->SCp.Status)
  55 #define CMD_RESID_LEN(Cmnd)         ((Cmnd)->SCp.buffers_residual)
  56 
  57 /**
  58  * struct fc_fcp_internal - FCP layer internal data
  59  * @scsi_pkt_pool: Memory pool to draw FCP packets from
  60  * @scsi_queue_lock: Protects the scsi_pkt_queue
  61  * @scsi_pkt_queue: Current FCP packets
  62  * @last_can_queue_ramp_down_time: ramp down time
  63  * @last_can_queue_ramp_up_time: ramp up time
  64  * @max_can_queue: max can_queue size
  65  */
  66 struct fc_fcp_internal {
  67         mempool_t               *scsi_pkt_pool;
  68         spinlock_t              scsi_queue_lock;
  69         struct list_head        scsi_pkt_queue;
  70         unsigned long           last_can_queue_ramp_down_time;
  71         unsigned long           last_can_queue_ramp_up_time;
  72         int                     max_can_queue;
  73 };
  74 
  75 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
  76 
  77 /*
  78  * function prototypes
  79  * FC scsi I/O related functions
  80  */
  81 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
  82 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
  83 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
  84 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
  85 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
  86 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
  87 static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
  88 static void fc_fcp_timeout(struct timer_list *);
  89 static void fc_fcp_rec(struct fc_fcp_pkt *);
  90 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
  91 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
  92 static void fc_io_compl(struct fc_fcp_pkt *);
  93 
  94 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
  95 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
  96 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
  97 
  98 /*
  99  * command status codes
 100  */
 101 #define FC_COMPLETE             0
 102 #define FC_CMD_ABORTED          1
 103 #define FC_CMD_RESET            2
 104 #define FC_CMD_PLOGO            3
 105 #define FC_SNS_RCV              4
 106 #define FC_TRANS_ERR            5
 107 #define FC_DATA_OVRRUN          6
 108 #define FC_DATA_UNDRUN          7
 109 #define FC_ERROR                8
 110 #define FC_HRD_ERROR            9
 111 #define FC_CRC_ERROR            10
 112 #define FC_TIMED_OUT            11
 113 #define FC_TRANS_RESET          12
 114 
 115 /*
 116  * Error recovery timeout values.
 117  */
 118 #define FC_SCSI_TM_TOV          (10 * HZ)
 119 #define FC_HOST_RESET_TIMEOUT   (30 * HZ)
 120 #define FC_CAN_QUEUE_PERIOD     (60 * HZ)
 121 
 122 #define FC_MAX_ERROR_CNT        5
 123 #define FC_MAX_RECOV_RETRY      3
 124 
 125 #define FC_FCP_DFLT_QUEUE_DEPTH 32
 126 
 127 /**
 128  * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
 129  * @lport: The local port that the FCP packet is for
 130  * @gfp:   GFP flags for allocation
 131  *
 132  * Return value: fcp_pkt structure or null on allocation failure.
 133  * Context:      Can be called from process context, no lock is required.
 134  */
 135 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
 136 {
 137         struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
 138         struct fc_fcp_pkt *fsp;
 139 
 140         fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
 141         if (fsp) {
 142                 memset(fsp, 0, sizeof(*fsp));
 143                 fsp->lp = lport;
 144                 fsp->xfer_ddp = FC_XID_UNKNOWN;
 145                 refcount_set(&fsp->ref_cnt, 1);
 146                 timer_setup(&fsp->timer, NULL, 0);
 147                 INIT_LIST_HEAD(&fsp->list);
 148                 spin_lock_init(&fsp->scsi_pkt_lock);
 149         } else {
 150                 per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++;
 151                 put_cpu();
 152         }
 153         return fsp;
 154 }
 155 
 156 /**
 157  * fc_fcp_pkt_release() - Release hold on a fcp_pkt
 158  * @fsp: The FCP packet to be released
 159  *
 160  * Context: Can be called from process or interrupt context,
 161  *          no lock is required.
 162  */
 163 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
 164 {
 165         if (refcount_dec_and_test(&fsp->ref_cnt)) {
 166                 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
 167 
 168                 mempool_free(fsp, si->scsi_pkt_pool);
 169         }
 170 }
 171 
 172 /**
 173  * fc_fcp_pkt_hold() - Hold a fcp_pkt
 174  * @fsp: The FCP packet to be held
 175  */
 176 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
 177 {
 178         refcount_inc(&fsp->ref_cnt);
 179 }
 180 
 181 /**
 182  * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt
 183  * @seq: The sequence that the FCP packet is on (required by destructor API)
 184  * @fsp: The FCP packet to be released
 185  *
 186  * This routine is called by a destructor callback in the fc_exch_seq_send()
 187  * routine of the libfc Transport Template. The 'struct fc_seq' is a required
 188  * argument even though it is not used by this routine.
 189  *
 190  * Context: No locking required.
 191  */
 192 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
 193 {
 194         fc_fcp_pkt_release(fsp);
 195 }
 196 
 197 /**
 198  * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
 199  * @fsp: The FCP packet to be locked and incremented
 200  *
 201  * We should only return error if we return a command to SCSI-ml before
 202  * getting a response. This can happen in cases where we send a abort, but
 203  * do not wait for the response and the abort and command can be passing
 204  * each other on the wire/network-layer.
 205  *
 206  * Note: this function locks the packet and gets a reference to allow
 207  * callers to call the completion function while the lock is held and
 208  * not have to worry about the packets refcount.
 209  *
 210  * TODO: Maybe we should just have callers grab/release the lock and
 211  * have a function that they call to verify the fsp and grab a ref if
 212  * needed.
 213  */
 214 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
 215 {
 216         spin_lock_bh(&fsp->scsi_pkt_lock);
 217         if (fsp->state & FC_SRB_COMPL) {
 218                 spin_unlock_bh(&fsp->scsi_pkt_lock);
 219                 return -EPERM;
 220         }
 221 
 222         fc_fcp_pkt_hold(fsp);
 223         return 0;
 224 }
 225 
 226 /**
 227  * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
 228  *                       reference count
 229  * @fsp: The FCP packet to be unlocked and decremented
 230  */
 231 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
 232 {
 233         spin_unlock_bh(&fsp->scsi_pkt_lock);
 234         fc_fcp_pkt_release(fsp);
 235 }
 236 
 237 /**
 238  * fc_fcp_timer_set() - Start a timer for a fcp_pkt
 239  * @fsp:   The FCP packet to start a timer for
 240  * @delay: The timeout period in jiffies
 241  */
 242 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
 243 {
 244         if (!(fsp->state & FC_SRB_COMPL)) {
 245                 mod_timer(&fsp->timer, jiffies + delay);
 246                 fsp->timer_delay = delay;
 247         }
 248 }
 249 
 250 static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp)
 251 {
 252         fsp->state |= FC_SRB_ABORTED;
 253         fsp->state &= ~FC_SRB_ABORT_PENDING;
 254 
 255         if (fsp->wait_for_comp)
 256                 complete(&fsp->tm_done);
 257         else
 258                 fc_fcp_complete_locked(fsp);
 259 }
 260 
 261 /**
 262  * fc_fcp_send_abort() - Send an abort for exchanges associated with a
 263  *                       fcp_pkt
 264  * @fsp: The FCP packet to abort exchanges on
 265  */
 266 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
 267 {
 268         int rc;
 269 
 270         if (!fsp->seq_ptr)
 271                 return -EINVAL;
 272 
 273         per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++;
 274         put_cpu();
 275 
 276         fsp->state |= FC_SRB_ABORT_PENDING;
 277         rc = fc_seq_exch_abort(fsp->seq_ptr, 0);
 278         /*
 279          * fc_seq_exch_abort() might return -ENXIO if
 280          * the sequence is already completed
 281          */
 282         if (rc == -ENXIO) {
 283                 fc_fcp_abort_done(fsp);
 284                 rc = 0;
 285         }
 286         return rc;
 287 }
 288 
 289 /**
 290  * fc_fcp_retry_cmd() - Retry a fcp_pkt
 291  * @fsp: The FCP packet to be retried
 292  *
 293  * Sets the status code to be FC_ERROR and then calls
 294  * fc_fcp_complete_locked() which in turn calls fc_io_compl().
 295  * fc_io_compl() will notify the SCSI-ml that the I/O is done.
 296  * The SCSI-ml will retry the command.
 297  */
 298 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code)
 299 {
 300         if (fsp->seq_ptr) {
 301                 fc_exch_done(fsp->seq_ptr);
 302                 fsp->seq_ptr = NULL;
 303         }
 304 
 305         fsp->state &= ~FC_SRB_ABORT_PENDING;
 306         fsp->io_status = 0;
 307         fsp->status_code = status_code;
 308         fc_fcp_complete_locked(fsp);
 309 }
 310 
 311 /**
 312  * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
 313  * @fsp: The FCP packet that will manage the DDP frames
 314  * @xid: The XID that will be used for the DDP exchange
 315  */
 316 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
 317 {
 318         struct fc_lport *lport;
 319 
 320         lport = fsp->lp;
 321         if ((fsp->req_flags & FC_SRB_READ) &&
 322             (lport->lro_enabled) && (lport->tt.ddp_setup)) {
 323                 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
 324                                         scsi_sg_count(fsp->cmd)))
 325                         fsp->xfer_ddp = xid;
 326         }
 327 }
 328 
 329 /**
 330  * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
 331  *                     DDP related resources for a fcp_pkt
 332  * @fsp: The FCP packet that DDP had been used on
 333  */
 334 void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
 335 {
 336         struct fc_lport *lport;
 337 
 338         if (!fsp)
 339                 return;
 340 
 341         if (fsp->xfer_ddp == FC_XID_UNKNOWN)
 342                 return;
 343 
 344         lport = fsp->lp;
 345         if (lport->tt.ddp_done) {
 346                 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
 347                 fsp->xfer_ddp = FC_XID_UNKNOWN;
 348         }
 349 }
 350 
 351 /**
 352  * fc_fcp_can_queue_ramp_up() - increases can_queue
 353  * @lport: lport to ramp up can_queue
 354  */
 355 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
 356 {
 357         struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
 358         unsigned long flags;
 359         int can_queue;
 360 
 361         spin_lock_irqsave(lport->host->host_lock, flags);
 362 
 363         if (si->last_can_queue_ramp_up_time &&
 364             (time_before(jiffies, si->last_can_queue_ramp_up_time +
 365                          FC_CAN_QUEUE_PERIOD)))
 366                 goto unlock;
 367 
 368         if (time_before(jiffies, si->last_can_queue_ramp_down_time +
 369                         FC_CAN_QUEUE_PERIOD))
 370                 goto unlock;
 371 
 372         si->last_can_queue_ramp_up_time = jiffies;
 373 
 374         can_queue = lport->host->can_queue << 1;
 375         if (can_queue >= si->max_can_queue) {
 376                 can_queue = si->max_can_queue;
 377                 si->last_can_queue_ramp_down_time = 0;
 378         }
 379         lport->host->can_queue = can_queue;
 380         shost_printk(KERN_ERR, lport->host, "libfc: increased "
 381                      "can_queue to %d.\n", can_queue);
 382 
 383 unlock:
 384         spin_unlock_irqrestore(lport->host->host_lock, flags);
 385 }
 386 
 387 /**
 388  * fc_fcp_can_queue_ramp_down() - reduces can_queue
 389  * @lport: lport to reduce can_queue
 390  *
 391  * If we are getting memory allocation failures, then we may
 392  * be trying to execute too many commands. We let the running
 393  * commands complete or timeout, then try again with a reduced
 394  * can_queue. Eventually we will hit the point where we run
 395  * on all reserved structs.
 396  */
 397 static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
 398 {
 399         struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
 400         unsigned long flags;
 401         int can_queue;
 402         bool changed = false;
 403 
 404         spin_lock_irqsave(lport->host->host_lock, flags);
 405 
 406         if (si->last_can_queue_ramp_down_time &&
 407             (time_before(jiffies, si->last_can_queue_ramp_down_time +
 408                          FC_CAN_QUEUE_PERIOD)))
 409                 goto unlock;
 410 
 411         si->last_can_queue_ramp_down_time = jiffies;
 412 
 413         can_queue = lport->host->can_queue;
 414         can_queue >>= 1;
 415         if (!can_queue)
 416                 can_queue = 1;
 417         lport->host->can_queue = can_queue;
 418         changed = true;
 419 
 420 unlock:
 421         spin_unlock_irqrestore(lport->host->host_lock, flags);
 422         return changed;
 423 }
 424 
 425 /*
 426  * fc_fcp_frame_alloc() -  Allocates fc_frame structure and buffer.
 427  * @lport:      fc lport struct
 428  * @len:        payload length
 429  *
 430  * Allocates fc_frame structure and buffer but if fails to allocate
 431  * then reduce can_queue.
 432  */
 433 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
 434                                                   size_t len)
 435 {
 436         struct fc_frame *fp;
 437 
 438         fp = fc_frame_alloc(lport, len);
 439         if (likely(fp))
 440                 return fp;
 441 
 442         per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++;
 443         put_cpu();
 444         /* error case */
 445         fc_fcp_can_queue_ramp_down(lport);
 446         shost_printk(KERN_ERR, lport->host,
 447                      "libfc: Could not allocate frame, "
 448                      "reducing can_queue to %d.\n", lport->host->can_queue);
 449         return NULL;
 450 }
 451 
 452 /**
 453  * get_fsp_rec_tov() - Helper function to get REC_TOV
 454  * @fsp: the FCP packet
 455  *
 456  * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
 457  */
 458 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
 459 {
 460         struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;
 461         unsigned int e_d_tov = FC_DEF_E_D_TOV;
 462 
 463         if (rpriv && rpriv->e_d_tov > e_d_tov)
 464                 e_d_tov = rpriv->e_d_tov;
 465         return msecs_to_jiffies(e_d_tov) + HZ;
 466 }
 467 
 468 /**
 469  * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
 470  * @fsp: The FCP packet the data is on
 471  * @fp:  The data frame
 472  */
 473 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
 474 {
 475         struct scsi_cmnd *sc = fsp->cmd;
 476         struct fc_lport *lport = fsp->lp;
 477         struct fc_stats *stats;
 478         struct fc_frame_header *fh;
 479         size_t start_offset;
 480         size_t offset;
 481         u32 crc;
 482         u32 copy_len = 0;
 483         size_t len;
 484         void *buf;
 485         struct scatterlist *sg;
 486         u32 nents;
 487         u8 host_bcode = FC_COMPLETE;
 488 
 489         fh = fc_frame_header_get(fp);
 490         offset = ntohl(fh->fh_parm_offset);
 491         start_offset = offset;
 492         len = fr_len(fp) - sizeof(*fh);
 493         buf = fc_frame_payload_get(fp, 0);
 494 
 495         /*
 496          * if this I/O is ddped then clear it and initiate recovery since data
 497          * frames are expected to be placed directly in that case.
 498          *
 499          * Indicate error to scsi-ml because something went wrong with the
 500          * ddp handling to get us here.
 501          */
 502         if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
 503                 fc_fcp_ddp_done(fsp);
 504                 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
 505                 host_bcode = FC_ERROR;
 506                 goto err;
 507         }
 508         if (offset + len > fsp->data_len) {
 509                 /* this should never happen */
 510                 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
 511                     fc_frame_crc_check(fp))
 512                         goto crc_err;
 513                 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
 514                            "data_len %x\n", len, offset, fsp->data_len);
 515 
 516                 /* Data is corrupted indicate scsi-ml should retry */
 517                 host_bcode = FC_DATA_OVRRUN;
 518                 goto err;
 519         }
 520         if (offset != fsp->xfer_len)
 521                 fsp->state |= FC_SRB_DISCONTIG;
 522 
 523         sg = scsi_sglist(sc);
 524         nents = scsi_sg_count(sc);
 525 
 526         if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
 527                 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
 528                                                     &offset, NULL);
 529         } else {
 530                 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
 531                 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
 532                                                     &offset, &crc);
 533                 buf = fc_frame_payload_get(fp, 0);
 534                 if (len % 4)
 535                         crc = crc32(crc, buf + len, 4 - (len % 4));
 536 
 537                 if (~crc != le32_to_cpu(fr_crc(fp))) {
 538 crc_err:
 539                         stats = per_cpu_ptr(lport->stats, get_cpu());
 540                         stats->ErrorFrames++;
 541                         /* per cpu count, not total count, but OK for limit */
 542                         if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT)
 543                                 printk(KERN_WARNING "libfc: CRC error on data "
 544                                        "frame for port (%6.6x)\n",
 545                                        lport->port_id);
 546                         put_cpu();
 547                         /*
 548                          * Assume the frame is total garbage.
 549                          * We may have copied it over the good part
 550                          * of the buffer.
 551                          * If so, we need to retry the entire operation.
 552                          * Otherwise, ignore it.
 553                          */
 554                         if (fsp->state & FC_SRB_DISCONTIG) {
 555                                 host_bcode = FC_CRC_ERROR;
 556                                 goto err;
 557                         }
 558                         return;
 559                 }
 560         }
 561 
 562         if (fsp->xfer_contig_end == start_offset)
 563                 fsp->xfer_contig_end += copy_len;
 564         fsp->xfer_len += copy_len;
 565 
 566         /*
 567          * In the very rare event that this data arrived after the response
 568          * and completes the transfer, call the completion handler.
 569          */
 570         if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
 571             fsp->xfer_len == fsp->data_len - fsp->scsi_resid) {
 572                 FC_FCP_DBG( fsp, "complete out-of-order sequence\n" );
 573                 fc_fcp_complete_locked(fsp);
 574         }
 575         return;
 576 err:
 577         fc_fcp_recovery(fsp, host_bcode);
 578 }
 579 
 580 /**
 581  * fc_fcp_send_data() - Send SCSI data to a target
 582  * @fsp:      The FCP packet the data is on
 583  * @sp:       The sequence the data is to be sent on
 584  * @offset:   The starting offset for this data request
 585  * @seq_blen: The burst length for this data request
 586  *
 587  * Called after receiving a Transfer Ready data descriptor.
 588  * If the LLD is capable of sequence offload then send down the
 589  * seq_blen amount of data in single frame, otherwise send
 590  * multiple frames of the maximum frame payload supported by
 591  * the target port.
 592  */
 593 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
 594                             size_t offset, size_t seq_blen)
 595 {
 596         struct fc_exch *ep;
 597         struct scsi_cmnd *sc;
 598         struct scatterlist *sg;
 599         struct fc_frame *fp = NULL;
 600         struct fc_lport *lport = fsp->lp;
 601         struct page *page;
 602         size_t remaining;
 603         size_t t_blen;
 604         size_t tlen;
 605         size_t sg_bytes;
 606         size_t frame_offset, fh_parm_offset;
 607         size_t off;
 608         int error;
 609         void *data = NULL;
 610         void *page_addr;
 611         int using_sg = lport->sg_supp;
 612         u32 f_ctl;
 613 
 614         WARN_ON(seq_blen <= 0);
 615         if (unlikely(offset + seq_blen > fsp->data_len)) {
 616                 /* this should never happen */
 617                 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
 618                            "offset %zx\n", seq_blen, offset);
 619                 fc_fcp_send_abort(fsp);
 620                 return 0;
 621         } else if (offset != fsp->xfer_len) {
 622                 /* Out of Order Data Request - no problem, but unexpected. */
 623                 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
 624                            "seq_blen %zx offset %zx\n", seq_blen, offset);
 625         }
 626 
 627         /*
 628          * if LLD is capable of seq_offload then set transport
 629          * burst length (t_blen) to seq_blen, otherwise set t_blen
 630          * to max FC frame payload previously set in fsp->max_payload.
 631          */
 632         t_blen = fsp->max_payload;
 633         if (lport->seq_offload) {
 634                 t_blen = min(seq_blen, (size_t)lport->lso_max);
 635                 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
 636                            fsp, seq_blen, lport->lso_max, t_blen);
 637         }
 638 
 639         if (t_blen > 512)
 640                 t_blen &= ~(512 - 1);   /* round down to block size */
 641         sc = fsp->cmd;
 642 
 643         remaining = seq_blen;
 644         fh_parm_offset = frame_offset = offset;
 645         tlen = 0;
 646         seq = fc_seq_start_next(seq);
 647         f_ctl = FC_FC_REL_OFF;
 648         WARN_ON(!seq);
 649 
 650         sg = scsi_sglist(sc);
 651 
 652         while (remaining > 0 && sg) {
 653                 if (offset >= sg->length) {
 654                         offset -= sg->length;
 655                         sg = sg_next(sg);
 656                         continue;
 657                 }
 658                 if (!fp) {
 659                         tlen = min(t_blen, remaining);
 660 
 661                         /*
 662                          * TODO.  Temporary workaround.  fc_seq_send() can't
 663                          * handle odd lengths in non-linear skbs.
 664                          * This will be the final fragment only.
 665                          */
 666                         if (tlen % 4)
 667                                 using_sg = 0;
 668                         fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
 669                         if (!fp)
 670                                 return -ENOMEM;
 671 
 672                         data = fc_frame_header_get(fp) + 1;
 673                         fh_parm_offset = frame_offset;
 674                         fr_max_payload(fp) = fsp->max_payload;
 675                 }
 676 
 677                 off = offset + sg->offset;
 678                 sg_bytes = min(tlen, sg->length - offset);
 679                 sg_bytes = min(sg_bytes,
 680                                (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
 681                 page = sg_page(sg) + (off >> PAGE_SHIFT);
 682                 if (using_sg) {
 683                         get_page(page);
 684                         skb_fill_page_desc(fp_skb(fp),
 685                                            skb_shinfo(fp_skb(fp))->nr_frags,
 686                                            page, off & ~PAGE_MASK, sg_bytes);
 687                         fp_skb(fp)->data_len += sg_bytes;
 688                         fr_len(fp) += sg_bytes;
 689                         fp_skb(fp)->truesize += PAGE_SIZE;
 690                 } else {
 691                         /*
 692                          * The scatterlist item may be bigger than PAGE_SIZE,
 693                          * but we must not cross pages inside the kmap.
 694                          */
 695                         page_addr = kmap_atomic(page);
 696                         memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
 697                                sg_bytes);
 698                         kunmap_atomic(page_addr);
 699                         data += sg_bytes;
 700                 }
 701                 offset += sg_bytes;
 702                 frame_offset += sg_bytes;
 703                 tlen -= sg_bytes;
 704                 remaining -= sg_bytes;
 705 
 706                 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
 707                     (tlen))
 708                         continue;
 709 
 710                 /*
 711                  * Send sequence with transfer sequence initiative in case
 712                  * this is last FCP frame of the sequence.
 713                  */
 714                 if (remaining == 0)
 715                         f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
 716 
 717                 ep = fc_seq_exch(seq);
 718                 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
 719                                FC_TYPE_FCP, f_ctl, fh_parm_offset);
 720 
 721                 /*
 722                  * send fragment using for a sequence.
 723                  */
 724                 error = fc_seq_send(lport, seq, fp);
 725                 if (error) {
 726                         WARN_ON(1);             /* send error should be rare */
 727                         return error;
 728                 }
 729                 fp = NULL;
 730         }
 731         fsp->xfer_len += seq_blen;      /* premature count? */
 732         return 0;
 733 }
 734 
 735 /**
 736  * fc_fcp_abts_resp() - Receive an ABTS response
 737  * @fsp: The FCP packet that is being aborted
 738  * @fp:  The response frame
 739  */
 740 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
 741 {
 742         int ba_done = 1;
 743         struct fc_ba_rjt *brp;
 744         struct fc_frame_header *fh;
 745 
 746         fh = fc_frame_header_get(fp);
 747         switch (fh->fh_r_ctl) {
 748         case FC_RCTL_BA_ACC:
 749                 break;
 750         case FC_RCTL_BA_RJT:
 751                 brp = fc_frame_payload_get(fp, sizeof(*brp));
 752                 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
 753                         break;
 754                 /* fall thru */
 755         default:
 756                 /*
 757                  * we will let the command timeout
 758                  * and scsi-ml recover in this case,
 759                  * therefore cleared the ba_done flag.
 760                  */
 761                 ba_done = 0;
 762         }
 763 
 764         if (ba_done)
 765                 fc_fcp_abort_done(fsp);
 766 }
 767 
 768 /**
 769  * fc_fcp_recv() - Receive an FCP frame
 770  * @seq: The sequence the frame is on
 771  * @fp:  The received frame
 772  * @arg: The related FCP packet
 773  *
 774  * Context: Called from Soft IRQ context. Can not be called
 775  *          holding the FCP packet list lock.
 776  */
 777 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
 778 {
 779         struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
 780         struct fc_lport *lport = fsp->lp;
 781         struct fc_frame_header *fh;
 782         struct fcp_txrdy *dd;
 783         u8 r_ctl;
 784         int rc = 0;
 785 
 786         if (IS_ERR(fp)) {
 787                 fc_fcp_error(fsp, fp);
 788                 return;
 789         }
 790 
 791         fh = fc_frame_header_get(fp);
 792         r_ctl = fh->fh_r_ctl;
 793 
 794         if (lport->state != LPORT_ST_READY) {
 795                 FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n",
 796                            lport->state, r_ctl);
 797                 goto out;
 798         }
 799         if (fc_fcp_lock_pkt(fsp))
 800                 goto out;
 801 
 802         if (fh->fh_type == FC_TYPE_BLS) {
 803                 fc_fcp_abts_resp(fsp, fp);
 804                 goto unlock;
 805         }
 806 
 807         if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) {
 808                 FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl);
 809                 goto unlock;
 810         }
 811 
 812         if (r_ctl == FC_RCTL_DD_DATA_DESC) {
 813                 /*
 814                  * received XFER RDY from the target
 815                  * need to send data to the target
 816                  */
 817                 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
 818                 dd = fc_frame_payload_get(fp, sizeof(*dd));
 819                 WARN_ON(!dd);
 820 
 821                 rc = fc_fcp_send_data(fsp, seq,
 822                                       (size_t) ntohl(dd->ft_data_ro),
 823                                       (size_t) ntohl(dd->ft_burst_len));
 824                 if (!rc)
 825                         seq->rec_data = fsp->xfer_len;
 826         } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
 827                 /*
 828                  * received a DATA frame
 829                  * next we will copy the data to the system buffer
 830                  */
 831                 WARN_ON(fr_len(fp) < sizeof(*fh));      /* len may be 0 */
 832                 fc_fcp_recv_data(fsp, fp);
 833                 seq->rec_data = fsp->xfer_contig_end;
 834         } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
 835                 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
 836 
 837                 fc_fcp_resp(fsp, fp);
 838         } else {
 839                 FC_FCP_DBG(fsp, "unexpected frame.  r_ctl %x\n", r_ctl);
 840         }
 841 unlock:
 842         fc_fcp_unlock_pkt(fsp);
 843 out:
 844         fc_frame_free(fp);
 845 }
 846 
 847 /**
 848  * fc_fcp_resp() - Handler for FCP responses
 849  * @fsp: The FCP packet the response is for
 850  * @fp:  The response frame
 851  */
 852 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
 853 {
 854         struct fc_frame_header *fh;
 855         struct fcp_resp *fc_rp;
 856         struct fcp_resp_ext *rp_ex;
 857         struct fcp_resp_rsp_info *fc_rp_info;
 858         u32 plen;
 859         u32 expected_len;
 860         u32 respl = 0;
 861         u32 snsl = 0;
 862         u8 flags = 0;
 863 
 864         plen = fr_len(fp);
 865         fh = (struct fc_frame_header *)fr_hdr(fp);
 866         if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
 867                 goto len_err;
 868         plen -= sizeof(*fh);
 869         fc_rp = (struct fcp_resp *)(fh + 1);
 870         fsp->cdb_status = fc_rp->fr_status;
 871         flags = fc_rp->fr_flags;
 872         fsp->scsi_comp_flags = flags;
 873         expected_len = fsp->data_len;
 874 
 875         /* if ddp, update xfer len */
 876         fc_fcp_ddp_done(fsp);
 877 
 878         if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
 879                 rp_ex = (void *)(fc_rp + 1);
 880                 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
 881                         if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
 882                                 goto len_err;
 883                         fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
 884                         if (flags & FCP_RSP_LEN_VAL) {
 885                                 respl = ntohl(rp_ex->fr_rsp_len);
 886                                 if ((respl != FCP_RESP_RSP_INFO_LEN4) &&
 887                                     (respl != FCP_RESP_RSP_INFO_LEN8))
 888                                         goto len_err;
 889                                 if (fsp->wait_for_comp) {
 890                                         /* Abuse cdb_status for rsp code */
 891                                         fsp->cdb_status = fc_rp_info->rsp_code;
 892                                         complete(&fsp->tm_done);
 893                                         /*
 894                                          * tmfs will not have any scsi cmd so
 895                                          * exit here
 896                                          */
 897                                         return;
 898                                 }
 899                         }
 900                         if (flags & FCP_SNS_LEN_VAL) {
 901                                 snsl = ntohl(rp_ex->fr_sns_len);
 902                                 if (snsl > SCSI_SENSE_BUFFERSIZE)
 903                                         snsl = SCSI_SENSE_BUFFERSIZE;
 904                                 memcpy(fsp->cmd->sense_buffer,
 905                                        (char *)fc_rp_info + respl, snsl);
 906                         }
 907                 }
 908                 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
 909                         if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
 910                                 goto len_err;
 911                         if (flags & FCP_RESID_UNDER) {
 912                                 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
 913                                 /*
 914                                  * The cmnd->underflow is the minimum number of
 915                                  * bytes that must be transferred for this
 916                                  * command.  Provided a sense condition is not
 917                                  * present, make sure the actual amount
 918                                  * transferred is at least the underflow value
 919                                  * or fail.
 920                                  */
 921                                 if (!(flags & FCP_SNS_LEN_VAL) &&
 922                                     (fc_rp->fr_status == 0) &&
 923                                     (scsi_bufflen(fsp->cmd) -
 924                                      fsp->scsi_resid) < fsp->cmd->underflow)
 925                                         goto err;
 926                                 expected_len -= fsp->scsi_resid;
 927                         } else {
 928                                 fsp->status_code = FC_ERROR;
 929                         }
 930                 }
 931         }
 932         fsp->state |= FC_SRB_RCV_STATUS;
 933 
 934         /*
 935          * Check for missing or extra data frames.
 936          */
 937         if (unlikely(fsp->cdb_status == SAM_STAT_GOOD &&
 938                      fsp->xfer_len != expected_len)) {
 939                 if (fsp->xfer_len < expected_len) {
 940                         /*
 941                          * Some data may be queued locally,
 942                          * Wait a at least one jiffy to see if it is delivered.
 943                          * If this expires without data, we may do SRR.
 944                          */
 945                         if (fsp->lp->qfull) {
 946                                 FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n",
 947                                            fsp->rport->port_id);
 948                                 return;
 949                         }
 950                         FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun "
 951                                    "len %x, data len %x\n",
 952                                    fsp->rport->port_id,
 953                                    fsp->xfer_len, expected_len, fsp->data_len);
 954                         fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
 955                         return;
 956                 }
 957                 fsp->status_code = FC_DATA_OVRRUN;
 958                 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
 959                            "len %x, data len %x\n",
 960                            fsp->rport->port_id,
 961                            fsp->xfer_len, expected_len, fsp->data_len);
 962         }
 963         fc_fcp_complete_locked(fsp);
 964         return;
 965 
 966 len_err:
 967         FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
 968                    "snsl %u\n", flags, fr_len(fp), respl, snsl);
 969 err:
 970         fsp->status_code = FC_ERROR;
 971         fc_fcp_complete_locked(fsp);
 972 }
 973 
 974 /**
 975  * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
 976  *                            fcp_pkt lock held
 977  * @fsp: The FCP packet to be completed
 978  *
 979  * This function may sleep if a timer is pending. The packet lock must be
 980  * held, and the host lock must not be held.
 981  */
 982 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
 983 {
 984         struct fc_lport *lport = fsp->lp;
 985         struct fc_seq *seq;
 986         struct fc_exch *ep;
 987         u32 f_ctl;
 988 
 989         if (fsp->state & FC_SRB_ABORT_PENDING)
 990                 return;
 991 
 992         if (fsp->state & FC_SRB_ABORTED) {
 993                 if (!fsp->status_code)
 994                         fsp->status_code = FC_CMD_ABORTED;
 995         } else {
 996                 /*
 997                  * Test for transport underrun, independent of response
 998                  * underrun status.
 999                  */
1000                 if (fsp->cdb_status == SAM_STAT_GOOD &&
1001                     fsp->xfer_len < fsp->data_len && !fsp->io_status &&
1002                     (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
1003                      fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
1004                         FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n",
1005                                     fsp->xfer_len, fsp->data_len);
1006                         fsp->status_code = FC_DATA_UNDRUN;
1007                 }
1008         }
1009 
1010         seq = fsp->seq_ptr;
1011         if (seq) {
1012                 fsp->seq_ptr = NULL;
1013                 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
1014                         struct fc_frame *conf_frame;
1015                         struct fc_seq *csp;
1016 
1017                         csp = fc_seq_start_next(seq);
1018                         conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
1019                         if (conf_frame) {
1020                                 f_ctl = FC_FC_SEQ_INIT;
1021                                 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
1022                                 ep = fc_seq_exch(seq);
1023                                 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
1024                                                ep->did, ep->sid,
1025                                                FC_TYPE_FCP, f_ctl, 0);
1026                                 fc_seq_send(lport, csp, conf_frame);
1027                         }
1028                 }
1029                 fc_exch_done(seq);
1030         }
1031         /*
1032          * Some resets driven by SCSI are not I/Os and do not have
1033          * SCSI commands associated with the requests. We should not
1034          * call I/O completion if we do not have a SCSI command.
1035          */
1036         if (fsp->cmd)
1037                 fc_io_compl(fsp);
1038 }
1039 
1040 /**
1041  * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
1042  * @fsp:   The FCP packet whose exchanges should be canceled
1043  * @error: The reason for the cancellation
1044  */
1045 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
1046 {
1047         if (fsp->seq_ptr) {
1048                 fc_exch_done(fsp->seq_ptr);
1049                 fsp->seq_ptr = NULL;
1050         }
1051         fsp->status_code = error;
1052 }
1053 
1054 /**
1055  * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1056  * @lport: The local port whose exchanges should be canceled
1057  * @id:    The target's ID
1058  * @lun:   The LUN
1059  * @error: The reason for cancellation
1060  *
1061  * If lun or id is -1, they are ignored.
1062  */
1063 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
1064                                     unsigned int lun, int error)
1065 {
1066         struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1067         struct fc_fcp_pkt *fsp;
1068         struct scsi_cmnd *sc_cmd;
1069         unsigned long flags;
1070 
1071         spin_lock_irqsave(&si->scsi_queue_lock, flags);
1072 restart:
1073         list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1074                 sc_cmd = fsp->cmd;
1075                 if (id != -1 && scmd_id(sc_cmd) != id)
1076                         continue;
1077 
1078                 if (lun != -1 && sc_cmd->device->lun != lun)
1079                         continue;
1080 
1081                 fc_fcp_pkt_hold(fsp);
1082                 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1083 
1084                 spin_lock_bh(&fsp->scsi_pkt_lock);
1085                 if (!(fsp->state & FC_SRB_COMPL)) {
1086                         fsp->state |= FC_SRB_COMPL;
1087                         /*
1088                          * TODO: dropping scsi_pkt_lock and then reacquiring
1089                          * again around fc_fcp_cleanup_cmd() is required,
1090                          * since fc_fcp_cleanup_cmd() calls into
1091                          * fc_seq_set_resp() and that func preempts cpu using
1092                          * schedule. May be schedule and related code should be
1093                          * removed instead of unlocking here to avoid scheduling
1094                          * while atomic bug.
1095                          */
1096                         spin_unlock_bh(&fsp->scsi_pkt_lock);
1097 
1098                         fc_fcp_cleanup_cmd(fsp, error);
1099 
1100                         spin_lock_bh(&fsp->scsi_pkt_lock);
1101                         fc_io_compl(fsp);
1102                 }
1103                 spin_unlock_bh(&fsp->scsi_pkt_lock);
1104 
1105                 fc_fcp_pkt_release(fsp);
1106                 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1107                 /*
1108                  * while we dropped the lock multiple pkts could
1109                  * have been released, so we have to start over.
1110                  */
1111                 goto restart;
1112         }
1113         spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1114 }
1115 
1116 /**
1117  * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1118  * @lport: The local port whose exchanges are to be aborted
1119  */
1120 static void fc_fcp_abort_io(struct fc_lport *lport)
1121 {
1122         fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1123 }
1124 
1125 /**
1126  * fc_fcp_pkt_send() - Send a fcp_pkt
1127  * @lport: The local port to send the FCP packet on
1128  * @fsp:   The FCP packet to send
1129  *
1130  * Return:  Zero for success and -1 for failure
1131  * Locks:   Called without locks held
1132  */
1133 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1134 {
1135         struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1136         unsigned long flags;
1137         int rc;
1138 
1139         fsp->cmd->SCp.ptr = (char *)fsp;
1140         fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1141         fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1142 
1143         int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun);
1144         memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1145 
1146         spin_lock_irqsave(&si->scsi_queue_lock, flags);
1147         list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1148         spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1149         rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1150         if (unlikely(rc)) {
1151                 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1152                 fsp->cmd->SCp.ptr = NULL;
1153                 list_del(&fsp->list);
1154                 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1155         }
1156 
1157         return rc;
1158 }
1159 
1160 /**
1161  * fc_fcp_cmd_send() - Send a FCP command
1162  * @lport: The local port to send the command on
1163  * @fsp:   The FCP packet the command is on
1164  * @resp:  The handler for the response
1165  */
1166 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1167                            void (*resp)(struct fc_seq *,
1168                                         struct fc_frame *fp,
1169                                         void *arg))
1170 {
1171         struct fc_frame *fp;
1172         struct fc_seq *seq;
1173         struct fc_rport *rport;
1174         struct fc_rport_libfc_priv *rpriv;
1175         const size_t len = sizeof(fsp->cdb_cmd);
1176         int rc = 0;
1177 
1178         if (fc_fcp_lock_pkt(fsp))
1179                 return 0;
1180 
1181         fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1182         if (!fp) {
1183                 rc = -1;
1184                 goto unlock;
1185         }
1186 
1187         memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1188         fr_fsp(fp) = fsp;
1189         rport = fsp->rport;
1190         fsp->max_payload = rport->maxframe_size;
1191         rpriv = rport->dd_data;
1192 
1193         fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1194                        rpriv->local_port->port_id, FC_TYPE_FCP,
1195                        FC_FCTL_REQ, 0);
1196 
1197         seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1198         if (!seq) {
1199                 rc = -1;
1200                 goto unlock;
1201         }
1202         fsp->seq_ptr = seq;
1203         fc_fcp_pkt_hold(fsp);   /* hold for fc_fcp_pkt_destroy */
1204 
1205         fsp->timer.function = fc_fcp_timeout;
1206         if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1207                 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1208 
1209 unlock:
1210         fc_fcp_unlock_pkt(fsp);
1211         return rc;
1212 }
1213 
1214 /**
1215  * fc_fcp_error() - Handler for FCP layer errors
1216  * @fsp: The FCP packet the error is on
1217  * @fp:  The frame that has errored
1218  */
1219 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1220 {
1221         int error = PTR_ERR(fp);
1222 
1223         if (fc_fcp_lock_pkt(fsp))
1224                 return;
1225 
1226         if (error == -FC_EX_CLOSED) {
1227                 fc_fcp_retry_cmd(fsp, FC_ERROR);
1228                 goto unlock;
1229         }
1230 
1231         /*
1232          * clear abort pending, because the lower layer
1233          * decided to force completion.
1234          */
1235         fsp->state &= ~FC_SRB_ABORT_PENDING;
1236         fsp->status_code = FC_CMD_PLOGO;
1237         fc_fcp_complete_locked(fsp);
1238 unlock:
1239         fc_fcp_unlock_pkt(fsp);
1240 }
1241 
1242 /**
1243  * fc_fcp_pkt_abort() - Abort a fcp_pkt
1244  * @fsp:   The FCP packet to abort on
1245  *
1246  * Called to send an abort and then wait for abort completion
1247  */
1248 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1249 {
1250         int rc = FAILED;
1251         unsigned long ticks_left;
1252 
1253         FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state);
1254         if (fc_fcp_send_abort(fsp)) {
1255                 FC_FCP_DBG(fsp, "failed to send abort\n");
1256                 return FAILED;
1257         }
1258 
1259         if (fsp->state & FC_SRB_ABORTED) {
1260                 FC_FCP_DBG(fsp, "target abort cmd  completed\n");
1261                 return SUCCESS;
1262         }
1263 
1264         init_completion(&fsp->tm_done);
1265         fsp->wait_for_comp = 1;
1266 
1267         spin_unlock_bh(&fsp->scsi_pkt_lock);
1268         ticks_left = wait_for_completion_timeout(&fsp->tm_done,
1269                                                         FC_SCSI_TM_TOV);
1270         spin_lock_bh(&fsp->scsi_pkt_lock);
1271         fsp->wait_for_comp = 0;
1272 
1273         if (!ticks_left) {
1274                 FC_FCP_DBG(fsp, "target abort cmd  failed\n");
1275         } else if (fsp->state & FC_SRB_ABORTED) {
1276                 FC_FCP_DBG(fsp, "target abort cmd  passed\n");
1277                 rc = SUCCESS;
1278                 fc_fcp_complete_locked(fsp);
1279         }
1280 
1281         return rc;
1282 }
1283 
1284 /**
1285  * fc_lun_reset_send() - Send LUN reset command
1286  * @data: The FCP packet that identifies the LUN to be reset
1287  */
1288 static void fc_lun_reset_send(struct timer_list *t)
1289 {
1290         struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer);
1291         struct fc_lport *lport = fsp->lp;
1292 
1293         if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1294                 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1295                         return;
1296                 if (fc_fcp_lock_pkt(fsp))
1297                         return;
1298                 fsp->timer.function = fc_lun_reset_send;
1299                 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1300                 fc_fcp_unlock_pkt(fsp);
1301         }
1302 }
1303 
1304 /**
1305  * fc_lun_reset() - Send a LUN RESET command to a device
1306  *                  and wait for the reply
1307  * @lport: The local port to sent the command on
1308  * @fsp:   The FCP packet that identifies the LUN to be reset
1309  * @id:    The SCSI command ID
1310  * @lun:   The LUN ID to be reset
1311  */
1312 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1313                         unsigned int id, unsigned int lun)
1314 {
1315         int rc;
1316 
1317         fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1318         fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1319         int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun);
1320 
1321         fsp->wait_for_comp = 1;
1322         init_completion(&fsp->tm_done);
1323 
1324         fc_lun_reset_send(&fsp->timer);
1325 
1326         /*
1327          * wait for completion of reset
1328          * after that make sure all commands are terminated
1329          */
1330         rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1331 
1332         spin_lock_bh(&fsp->scsi_pkt_lock);
1333         fsp->state |= FC_SRB_COMPL;
1334         spin_unlock_bh(&fsp->scsi_pkt_lock);
1335 
1336         del_timer_sync(&fsp->timer);
1337 
1338         spin_lock_bh(&fsp->scsi_pkt_lock);
1339         if (fsp->seq_ptr) {
1340                 fc_exch_done(fsp->seq_ptr);
1341                 fsp->seq_ptr = NULL;
1342         }
1343         fsp->wait_for_comp = 0;
1344         spin_unlock_bh(&fsp->scsi_pkt_lock);
1345 
1346         if (!rc) {
1347                 FC_SCSI_DBG(lport, "lun reset failed\n");
1348                 return FAILED;
1349         }
1350 
1351         /* cdb_status holds the tmf's rsp code */
1352         if (fsp->cdb_status != FCP_TMF_CMPL)
1353                 return FAILED;
1354 
1355         FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1356         fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1357         return SUCCESS;
1358 }
1359 
1360 /**
1361  * fc_tm_done() - Task Management response handler
1362  * @seq: The sequence that the response is on
1363  * @fp:  The response frame
1364  * @arg: The FCP packet the response is for
1365  */
1366 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1367 {
1368         struct fc_fcp_pkt *fsp = arg;
1369         struct fc_frame_header *fh;
1370 
1371         if (IS_ERR(fp)) {
1372                 /*
1373                  * If there is an error just let it timeout or wait
1374                  * for TMF to be aborted if it timedout.
1375                  *
1376                  * scsi-eh will escalate for when either happens.
1377                  */
1378                 return;
1379         }
1380 
1381         if (fc_fcp_lock_pkt(fsp))
1382                 goto out;
1383 
1384         /*
1385          * raced with eh timeout handler.
1386          */
1387         if (!fsp->seq_ptr || !fsp->wait_for_comp)
1388                 goto out_unlock;
1389 
1390         fh = fc_frame_header_get(fp);
1391         if (fh->fh_type != FC_TYPE_BLS)
1392                 fc_fcp_resp(fsp, fp);
1393         fsp->seq_ptr = NULL;
1394         fc_exch_done(seq);
1395 out_unlock:
1396         fc_fcp_unlock_pkt(fsp);
1397 out:
1398         fc_frame_free(fp);
1399 }
1400 
1401 /**
1402  * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1403  * @lport: The local port to be cleaned up
1404  */
1405 static void fc_fcp_cleanup(struct fc_lport *lport)
1406 {
1407         fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1408 }
1409 
1410 /**
1411  * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1412  * @data: The FCP packet that has timed out
1413  *
1414  * If REC is supported then just issue it and return. The REC exchange will
1415  * complete or time out and recovery can continue at that point. Otherwise,
1416  * if the response has been received without all the data it has been
1417  * ER_TIMEOUT since the response was received. If the response has not been
1418  * received we see if data was received recently. If it has been then we
1419  * continue waiting, otherwise, we abort the command.
1420  */
1421 static void fc_fcp_timeout(struct timer_list *t)
1422 {
1423         struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer);
1424         struct fc_rport *rport = fsp->rport;
1425         struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1426 
1427         if (fc_fcp_lock_pkt(fsp))
1428                 return;
1429 
1430         if (fsp->cdb_cmd.fc_tm_flags)
1431                 goto unlock;
1432 
1433         if (fsp->lp->qfull) {
1434                 FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n",
1435                            fsp->timer_delay);
1436                 fsp->timer.function = fc_fcp_timeout;
1437                 fc_fcp_timer_set(fsp, fsp->timer_delay);
1438                 goto unlock;
1439         }
1440         FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n",
1441                    fsp->timer_delay, rpriv->flags, fsp->state);
1442         fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1443 
1444         if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1445                 fc_fcp_rec(fsp);
1446         else if (fsp->state & FC_SRB_RCV_STATUS)
1447                 fc_fcp_complete_locked(fsp);
1448         else
1449                 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1450         fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1451 unlock:
1452         fc_fcp_unlock_pkt(fsp);
1453 }
1454 
1455 /**
1456  * fc_fcp_rec() - Send a REC ELS request
1457  * @fsp: The FCP packet to send the REC request on
1458  */
1459 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1460 {
1461         struct fc_lport *lport;
1462         struct fc_frame *fp;
1463         struct fc_rport *rport;
1464         struct fc_rport_libfc_priv *rpriv;
1465 
1466         lport = fsp->lp;
1467         rport = fsp->rport;
1468         rpriv = rport->dd_data;
1469         if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1470                 fsp->status_code = FC_HRD_ERROR;
1471                 fsp->io_status = 0;
1472                 fc_fcp_complete_locked(fsp);
1473                 return;
1474         }
1475 
1476         fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1477         if (!fp)
1478                 goto retry;
1479 
1480         fr_seq(fp) = fsp->seq_ptr;
1481         fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1482                        rpriv->local_port->port_id, FC_TYPE_ELS,
1483                        FC_FCTL_REQ, 0);
1484         if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1485                                  fc_fcp_rec_resp, fsp,
1486                                  2 * lport->r_a_tov)) {
1487                 fc_fcp_pkt_hold(fsp);           /* hold while REC outstanding */
1488                 return;
1489         }
1490 retry:
1491         if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1492                 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1493         else
1494                 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1495 }
1496 
1497 /**
1498  * fc_fcp_rec_resp() - Handler for REC ELS responses
1499  * @seq: The sequence the response is on
1500  * @fp:  The response frame
1501  * @arg: The FCP packet the response is on
1502  *
1503  * If the response is a reject then the scsi layer will handle
1504  * the timeout. If the response is a LS_ACC then if the I/O was not completed
1505  * set the timeout and return. If the I/O was completed then complete the
1506  * exchange and tell the SCSI layer.
1507  */
1508 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1509 {
1510         struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1511         struct fc_els_rec_acc *recp;
1512         struct fc_els_ls_rjt *rjt;
1513         u32 e_stat;
1514         u8 opcode;
1515         u32 offset;
1516         enum dma_data_direction data_dir;
1517         enum fc_rctl r_ctl;
1518         struct fc_rport_libfc_priv *rpriv;
1519 
1520         if (IS_ERR(fp)) {
1521                 fc_fcp_rec_error(fsp, fp);
1522                 return;
1523         }
1524 
1525         if (fc_fcp_lock_pkt(fsp))
1526                 goto out;
1527 
1528         fsp->recov_retry = 0;
1529         opcode = fc_frame_payload_op(fp);
1530         if (opcode == ELS_LS_RJT) {
1531                 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1532                 switch (rjt->er_reason) {
1533                 default:
1534                         FC_FCP_DBG(fsp,
1535                                    "device %x invalid REC reject %d/%d\n",
1536                                    fsp->rport->port_id, rjt->er_reason,
1537                                    rjt->er_explan);
1538                         /* fall through */
1539                 case ELS_RJT_UNSUP:
1540                         FC_FCP_DBG(fsp, "device does not support REC\n");
1541                         rpriv = fsp->rport->dd_data;
1542                         /*
1543                          * if we do not spport RECs or got some bogus
1544                          * reason then resetup timer so we check for
1545                          * making progress.
1546                          */
1547                         rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1548                         break;
1549                 case ELS_RJT_LOGIC:
1550                 case ELS_RJT_UNAB:
1551                         FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n",
1552                                    fsp->rport->port_id, rjt->er_reason,
1553                                    rjt->er_explan);
1554                         /*
1555                          * If response got lost or is stuck in the
1556                          * queue somewhere we have no idea if and when
1557                          * the response will be received. So quarantine
1558                          * the xid and retry the command.
1559                          */
1560                         if (rjt->er_explan == ELS_EXPL_OXID_RXID) {
1561                                 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1562                                 ep->state |= FC_EX_QUARANTINE;
1563                                 fsp->state |= FC_SRB_ABORTED;
1564                                 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET);
1565                                 break;
1566                         }
1567                         fc_fcp_recovery(fsp, FC_TRANS_RESET);
1568                         break;
1569                 }
1570         } else if (opcode == ELS_LS_ACC) {
1571                 if (fsp->state & FC_SRB_ABORTED)
1572                         goto unlock_out;
1573 
1574                 data_dir = fsp->cmd->sc_data_direction;
1575                 recp = fc_frame_payload_get(fp, sizeof(*recp));
1576                 offset = ntohl(recp->reca_fc4value);
1577                 e_stat = ntohl(recp->reca_e_stat);
1578 
1579                 if (e_stat & ESB_ST_COMPLETE) {
1580 
1581                         /*
1582                          * The exchange is complete.
1583                          *
1584                          * For output, we must've lost the response.
1585                          * For input, all data must've been sent.
1586                          * We lost may have lost the response
1587                          * (and a confirmation was requested) and maybe
1588                          * some data.
1589                          *
1590                          * If all data received, send SRR
1591                          * asking for response.  If partial data received,
1592                          * or gaps, SRR requests data at start of gap.
1593                          * Recovery via SRR relies on in-order-delivery.
1594                          */
1595                         if (data_dir == DMA_TO_DEVICE) {
1596                                 r_ctl = FC_RCTL_DD_CMD_STATUS;
1597                         } else if (fsp->xfer_contig_end == offset) {
1598                                 r_ctl = FC_RCTL_DD_CMD_STATUS;
1599                         } else {
1600                                 offset = fsp->xfer_contig_end;
1601                                 r_ctl = FC_RCTL_DD_SOL_DATA;
1602                         }
1603                         fc_fcp_srr(fsp, r_ctl, offset);
1604                 } else if (e_stat & ESB_ST_SEQ_INIT) {
1605                         /*
1606                          * The remote port has the initiative, so just
1607                          * keep waiting for it to complete.
1608                          */
1609                         fc_fcp_timer_set(fsp,  get_fsp_rec_tov(fsp));
1610                 } else {
1611 
1612                         /*
1613                          * The exchange is incomplete, we have seq. initiative.
1614                          * Lost response with requested confirmation,
1615                          * lost confirmation, lost transfer ready or
1616                          * lost write data.
1617                          *
1618                          * For output, if not all data was received, ask
1619                          * for transfer ready to be repeated.
1620                          *
1621                          * If we received or sent all the data, send SRR to
1622                          * request response.
1623                          *
1624                          * If we lost a response, we may have lost some read
1625                          * data as well.
1626                          */
1627                         r_ctl = FC_RCTL_DD_SOL_DATA;
1628                         if (data_dir == DMA_TO_DEVICE) {
1629                                 r_ctl = FC_RCTL_DD_CMD_STATUS;
1630                                 if (offset < fsp->data_len)
1631                                         r_ctl = FC_RCTL_DD_DATA_DESC;
1632                         } else if (offset == fsp->xfer_contig_end) {
1633                                 r_ctl = FC_RCTL_DD_CMD_STATUS;
1634                         } else if (fsp->xfer_contig_end < offset) {
1635                                 offset = fsp->xfer_contig_end;
1636                         }
1637                         fc_fcp_srr(fsp, r_ctl, offset);
1638                 }
1639         }
1640 unlock_out:
1641         fc_fcp_unlock_pkt(fsp);
1642 out:
1643         fc_fcp_pkt_release(fsp);        /* drop hold for outstanding REC */
1644         fc_frame_free(fp);
1645 }
1646 
1647 /**
1648  * fc_fcp_rec_error() - Handler for REC errors
1649  * @fsp: The FCP packet the error is on
1650  * @fp:  The REC frame
1651  */
1652 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1653 {
1654         int error = PTR_ERR(fp);
1655 
1656         if (fc_fcp_lock_pkt(fsp))
1657                 goto out;
1658 
1659         switch (error) {
1660         case -FC_EX_CLOSED:
1661                 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n",
1662                            fsp, fsp->rport->port_id);
1663                 fc_fcp_retry_cmd(fsp, FC_ERROR);
1664                 break;
1665 
1666         default:
1667                 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1668                            fsp, fsp->rport->port_id, error);
1669                 fsp->status_code = FC_CMD_PLOGO;
1670                 /* fall through */
1671 
1672         case -FC_EX_TIMEOUT:
1673                 /*
1674                  * Assume REC or LS_ACC was lost.
1675                  * The exchange manager will have aborted REC, so retry.
1676                  */
1677                 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n",
1678                            fsp, fsp->rport->port_id, fsp->recov_retry,
1679                            FC_MAX_RECOV_RETRY);
1680                 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1681                         fc_fcp_rec(fsp);
1682                 else
1683                         fc_fcp_recovery(fsp, FC_ERROR);
1684                 break;
1685         }
1686         fc_fcp_unlock_pkt(fsp);
1687 out:
1688         fc_fcp_pkt_release(fsp);        /* drop hold for outstanding REC */
1689 }
1690 
1691 /**
1692  * fc_fcp_recovery() - Handler for fcp_pkt recovery
1693  * @fsp: The FCP pkt that needs to be aborted
1694  */
1695 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1696 {
1697         FC_FCP_DBG(fsp, "start recovery code %x\n", code);
1698         fsp->status_code = code;
1699         fsp->cdb_status = 0;
1700         fsp->io_status = 0;
1701         /*
1702          * if this fails then we let the scsi command timer fire and
1703          * scsi-ml escalate.
1704          */
1705         fc_fcp_send_abort(fsp);
1706 }
1707 
1708 /**
1709  * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1710  * @fsp:   The FCP packet the SRR is to be sent on
1711  * @r_ctl: The R_CTL field for the SRR request
1712  * This is called after receiving status but insufficient data, or
1713  * when expecting status but the request has timed out.
1714  */
1715 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1716 {
1717         struct fc_lport *lport = fsp->lp;
1718         struct fc_rport *rport;
1719         struct fc_rport_libfc_priv *rpriv;
1720         struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1721         struct fc_seq *seq;
1722         struct fcp_srr *srr;
1723         struct fc_frame *fp;
1724 
1725         rport = fsp->rport;
1726         rpriv = rport->dd_data;
1727 
1728         if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1729             rpriv->rp_state != RPORT_ST_READY)
1730                 goto retry;                     /* shouldn't happen */
1731         fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1732         if (!fp)
1733                 goto retry;
1734 
1735         srr = fc_frame_payload_get(fp, sizeof(*srr));
1736         memset(srr, 0, sizeof(*srr));
1737         srr->srr_op = ELS_SRR;
1738         srr->srr_ox_id = htons(ep->oxid);
1739         srr->srr_rx_id = htons(ep->rxid);
1740         srr->srr_r_ctl = r_ctl;
1741         srr->srr_rel_off = htonl(offset);
1742 
1743         fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1744                        rpriv->local_port->port_id, FC_TYPE_FCP,
1745                        FC_FCTL_REQ, 0);
1746 
1747         seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp,
1748                                fc_fcp_pkt_destroy,
1749                                fsp, get_fsp_rec_tov(fsp));
1750         if (!seq)
1751                 goto retry;
1752 
1753         fsp->recov_seq = seq;
1754         fsp->xfer_len = offset;
1755         fsp->xfer_contig_end = offset;
1756         fsp->state &= ~FC_SRB_RCV_STATUS;
1757         fc_fcp_pkt_hold(fsp);           /* hold for outstanding SRR */
1758         return;
1759 retry:
1760         fc_fcp_retry_cmd(fsp, FC_TRANS_RESET);
1761 }
1762 
1763 /**
1764  * fc_fcp_srr_resp() - Handler for SRR response
1765  * @seq: The sequence the SRR is on
1766  * @fp:  The SRR frame
1767  * @arg: The FCP packet the SRR is on
1768  */
1769 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1770 {
1771         struct fc_fcp_pkt *fsp = arg;
1772         struct fc_frame_header *fh;
1773 
1774         if (IS_ERR(fp)) {
1775                 fc_fcp_srr_error(fsp, fp);
1776                 return;
1777         }
1778 
1779         if (fc_fcp_lock_pkt(fsp))
1780                 goto out;
1781 
1782         fh = fc_frame_header_get(fp);
1783         /*
1784          * BUG? fc_fcp_srr_error calls fc_exch_done which would release
1785          * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1786          * then fc_exch_timeout would be sending an abort. The fc_exch_done
1787          * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1788          * an abort response though.
1789          */
1790         if (fh->fh_type == FC_TYPE_BLS) {
1791                 fc_fcp_unlock_pkt(fsp);
1792                 return;
1793         }
1794 
1795         switch (fc_frame_payload_op(fp)) {
1796         case ELS_LS_ACC:
1797                 fsp->recov_retry = 0;
1798                 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1799                 break;
1800         case ELS_LS_RJT:
1801         default:
1802                 fc_fcp_recovery(fsp, FC_ERROR);
1803                 break;
1804         }
1805         fc_fcp_unlock_pkt(fsp);
1806 out:
1807         fc_exch_done(seq);
1808         fc_frame_free(fp);
1809 }
1810 
1811 /**
1812  * fc_fcp_srr_error() - Handler for SRR errors
1813  * @fsp: The FCP packet that the SRR error is on
1814  * @fp:  The SRR frame
1815  */
1816 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1817 {
1818         if (fc_fcp_lock_pkt(fsp))
1819                 goto out;
1820         switch (PTR_ERR(fp)) {
1821         case -FC_EX_TIMEOUT:
1822                 FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry);
1823                 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1824                         fc_fcp_rec(fsp);
1825                 else
1826                         fc_fcp_recovery(fsp, FC_TIMED_OUT);
1827                 break;
1828         case -FC_EX_CLOSED:                     /* e.g., link failure */
1829                 FC_FCP_DBG(fsp, "SRR error, exchange closed\n");
1830                 /* fall through */
1831         default:
1832                 fc_fcp_retry_cmd(fsp, FC_ERROR);
1833                 break;
1834         }
1835         fc_fcp_unlock_pkt(fsp);
1836 out:
1837         fc_exch_done(fsp->recov_seq);
1838 }
1839 
1840 /**
1841  * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1842  * @lport: The local port to be checked
1843  */
1844 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1845 {
1846         /* lock ? */
1847         return (lport->state == LPORT_ST_READY) &&
1848                 lport->link_up && !lport->qfull;
1849 }
1850 
1851 /**
1852  * fc_queuecommand() - The queuecommand function of the SCSI template
1853  * @shost: The Scsi_Host that the command was issued to
1854  * @cmd:   The scsi_cmnd to be executed
1855  *
1856  * This is the i/o strategy routine, called by the SCSI layer.
1857  */
1858 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
1859 {
1860         struct fc_lport *lport = shost_priv(shost);
1861         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1862         struct fc_fcp_pkt *fsp;
1863         int rval;
1864         int rc = 0;
1865         struct fc_stats *stats;
1866 
1867         rval = fc_remote_port_chkready(rport);
1868         if (rval) {
1869                 sc_cmd->result = rval;
1870                 sc_cmd->scsi_done(sc_cmd);
1871                 return 0;
1872         }
1873 
1874         if (!*(struct fc_remote_port **)rport->dd_data) {
1875                 /*
1876                  * rport is transitioning from blocked/deleted to
1877                  * online
1878                  */
1879                 sc_cmd->result = DID_IMM_RETRY << 16;
1880                 sc_cmd->scsi_done(sc_cmd);
1881                 goto out;
1882         }
1883 
1884         if (!fc_fcp_lport_queue_ready(lport)) {
1885                 if (lport->qfull) {
1886                         if (fc_fcp_can_queue_ramp_down(lport))
1887                                 shost_printk(KERN_ERR, lport->host,
1888                                              "libfc: queue full, "
1889                                              "reducing can_queue to %d.\n",
1890                                              lport->host->can_queue);
1891                 }
1892                 rc = SCSI_MLQUEUE_HOST_BUSY;
1893                 goto out;
1894         }
1895 
1896         fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1897         if (fsp == NULL) {
1898                 rc = SCSI_MLQUEUE_HOST_BUSY;
1899                 goto out;
1900         }
1901 
1902         /*
1903          * build the libfc request pkt
1904          */
1905         fsp->cmd = sc_cmd;      /* save the cmd */
1906         fsp->rport = rport;     /* set the remote port ptr */
1907 
1908         /*
1909          * set up the transfer length
1910          */
1911         fsp->data_len = scsi_bufflen(sc_cmd);
1912         fsp->xfer_len = 0;
1913 
1914         /*
1915          * setup the data direction
1916          */
1917         stats = per_cpu_ptr(lport->stats, get_cpu());
1918         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1919                 fsp->req_flags = FC_SRB_READ;
1920                 stats->InputRequests++;
1921                 stats->InputBytes += fsp->data_len;
1922         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1923                 fsp->req_flags = FC_SRB_WRITE;
1924                 stats->OutputRequests++;
1925                 stats->OutputBytes += fsp->data_len;
1926         } else {
1927                 fsp->req_flags = 0;
1928                 stats->ControlRequests++;
1929         }
1930         put_cpu();
1931 
1932         /*
1933          * send it to the lower layer
1934          * if we get -1 return then put the request in the pending
1935          * queue.
1936          */
1937         rval = fc_fcp_pkt_send(lport, fsp);
1938         if (rval != 0) {
1939                 fsp->state = FC_SRB_FREE;
1940                 fc_fcp_pkt_release(fsp);
1941                 rc = SCSI_MLQUEUE_HOST_BUSY;
1942         }
1943 out:
1944         return rc;
1945 }
1946 EXPORT_SYMBOL(fc_queuecommand);
1947 
1948 /**
1949  * fc_io_compl() - Handle responses for completed commands
1950  * @fsp: The FCP packet that is complete
1951  *
1952  * Translates fcp_pkt errors to a Linux SCSI errors.
1953  * The fcp packet lock must be held when calling.
1954  */
1955 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1956 {
1957         struct fc_fcp_internal *si;
1958         struct scsi_cmnd *sc_cmd;
1959         struct fc_lport *lport;
1960         unsigned long flags;
1961 
1962         /* release outstanding ddp context */
1963         fc_fcp_ddp_done(fsp);
1964 
1965         fsp->state |= FC_SRB_COMPL;
1966         if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1967                 spin_unlock_bh(&fsp->scsi_pkt_lock);
1968                 del_timer_sync(&fsp->timer);
1969                 spin_lock_bh(&fsp->scsi_pkt_lock);
1970         }
1971 
1972         lport = fsp->lp;
1973         si = fc_get_scsi_internal(lport);
1974 
1975         /*
1976          * if can_queue ramp down is done then try can_queue ramp up
1977          * since commands are completing now.
1978          */
1979         if (si->last_can_queue_ramp_down_time)
1980                 fc_fcp_can_queue_ramp_up(lport);
1981 
1982         sc_cmd = fsp->cmd;
1983         CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1984         switch (fsp->status_code) {
1985         case FC_COMPLETE:
1986                 if (fsp->cdb_status == 0) {
1987                         /*
1988                          * good I/O status
1989                          */
1990                         sc_cmd->result = DID_OK << 16;
1991                         if (fsp->scsi_resid)
1992                                 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1993                 } else {
1994                         /*
1995                          * transport level I/O was ok but scsi
1996                          * has non zero status
1997                          */
1998                         sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1999                 }
2000                 break;
2001         case FC_ERROR:
2002                 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2003                            "due to FC_ERROR\n");
2004                 sc_cmd->result = DID_ERROR << 16;
2005                 break;
2006         case FC_DATA_UNDRUN:
2007                 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
2008                         /*
2009                          * scsi status is good but transport level
2010                          * underrun.
2011                          */
2012                         if (fsp->state & FC_SRB_RCV_STATUS) {
2013                                 sc_cmd->result = DID_OK << 16;
2014                         } else {
2015                                 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
2016                                            " due to FC_DATA_UNDRUN (trans)\n");
2017                                 sc_cmd->result = DID_ERROR << 16;
2018                         }
2019                 } else {
2020                         /*
2021                          * scsi got underrun, this is an error
2022                          */
2023                         FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2024                                    "due to FC_DATA_UNDRUN (scsi)\n");
2025                         CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
2026                         sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
2027                 }
2028                 break;
2029         case FC_DATA_OVRRUN:
2030                 /*
2031                  * overrun is an error
2032                  */
2033                 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2034                            "due to FC_DATA_OVRRUN\n");
2035                 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
2036                 break;
2037         case FC_CMD_ABORTED:
2038                 if (host_byte(sc_cmd->result) == DID_TIME_OUT)
2039                         FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml "
2040                                    "due to FC_CMD_ABORTED\n");
2041                 else {
2042                         FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2043                                    "due to FC_CMD_ABORTED\n");
2044                         set_host_byte(sc_cmd, DID_ERROR);
2045                 }
2046                 sc_cmd->result |= fsp->io_status;
2047                 break;
2048         case FC_CMD_RESET:
2049                 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
2050                            "due to FC_CMD_RESET\n");
2051                 sc_cmd->result = (DID_RESET << 16);
2052                 break;
2053         case FC_TRANS_RESET:
2054                 FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml "
2055                            "due to FC_TRANS_RESET\n");
2056                 sc_cmd->result = (DID_SOFT_ERROR << 16);
2057                 break;
2058         case FC_HRD_ERROR:
2059                 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
2060                            "due to FC_HRD_ERROR\n");
2061                 sc_cmd->result = (DID_NO_CONNECT << 16);
2062                 break;
2063         case FC_CRC_ERROR:
2064                 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
2065                            "due to FC_CRC_ERROR\n");
2066                 sc_cmd->result = (DID_PARITY << 16);
2067                 break;
2068         case FC_TIMED_OUT:
2069                 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
2070                            "due to FC_TIMED_OUT\n");
2071                 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
2072                 break;
2073         default:
2074                 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2075                            "due to unknown error\n");
2076                 sc_cmd->result = (DID_ERROR << 16);
2077                 break;
2078         }
2079 
2080         if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
2081                 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
2082 
2083         spin_lock_irqsave(&si->scsi_queue_lock, flags);
2084         list_del(&fsp->list);
2085         sc_cmd->SCp.ptr = NULL;
2086         spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2087         sc_cmd->scsi_done(sc_cmd);
2088 
2089         /* release ref from initial allocation in queue command */
2090         fc_fcp_pkt_release(fsp);
2091 }
2092 
2093 /**
2094  * fc_eh_abort() - Abort a command
2095  * @sc_cmd: The SCSI command to abort
2096  *
2097  * From SCSI host template.
2098  * Send an ABTS to the target device and wait for the response.
2099  */
2100 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2101 {
2102         struct fc_fcp_pkt *fsp;
2103         struct fc_lport *lport;
2104         struct fc_fcp_internal *si;
2105         int rc = FAILED;
2106         unsigned long flags;
2107         int rval;
2108 
2109         rval = fc_block_scsi_eh(sc_cmd);
2110         if (rval)
2111                 return rval;
2112 
2113         lport = shost_priv(sc_cmd->device->host);
2114         if (lport->state != LPORT_ST_READY)
2115                 return rc;
2116         else if (!lport->link_up)
2117                 return rc;
2118 
2119         si = fc_get_scsi_internal(lport);
2120         spin_lock_irqsave(&si->scsi_queue_lock, flags);
2121         fsp = CMD_SP(sc_cmd);
2122         if (!fsp) {
2123                 /* command completed while scsi eh was setting up */
2124                 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2125                 return SUCCESS;
2126         }
2127         /* grab a ref so the fsp and sc_cmd cannot be released from under us */
2128         fc_fcp_pkt_hold(fsp);
2129         spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2130 
2131         if (fc_fcp_lock_pkt(fsp)) {
2132                 /* completed while we were waiting for timer to be deleted */
2133                 rc = SUCCESS;
2134                 goto release_pkt;
2135         }
2136 
2137         rc = fc_fcp_pkt_abort(fsp);
2138         fc_fcp_unlock_pkt(fsp);
2139 
2140 release_pkt:
2141         fc_fcp_pkt_release(fsp);
2142         return rc;
2143 }
2144 EXPORT_SYMBOL(fc_eh_abort);
2145 
2146 /**
2147  * fc_eh_device_reset() - Reset a single LUN
2148  * @sc_cmd: The SCSI command which identifies the device whose
2149  *          LUN is to be reset
2150  *
2151  * Set from SCSI host template.
2152  */
2153 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2154 {
2155         struct fc_lport *lport;
2156         struct fc_fcp_pkt *fsp;
2157         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2158         int rc = FAILED;
2159         int rval;
2160 
2161         rval = fc_block_scsi_eh(sc_cmd);
2162         if (rval)
2163                 return rval;
2164 
2165         lport = shost_priv(sc_cmd->device->host);
2166 
2167         if (lport->state != LPORT_ST_READY)
2168                 return rc;
2169 
2170         FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2171 
2172         fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2173         if (fsp == NULL) {
2174                 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2175                 goto out;
2176         }
2177 
2178         /*
2179          * Build the libfc request pkt. Do not set the scsi cmnd, because
2180          * the sc passed in is not setup for execution like when sent
2181          * through the queuecommand callout.
2182          */
2183         fsp->rport = rport;     /* set the remote port ptr */
2184 
2185         /*
2186          * flush outstanding commands
2187          */
2188         rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2189         fsp->state = FC_SRB_FREE;
2190         fc_fcp_pkt_release(fsp);
2191 
2192 out:
2193         return rc;
2194 }
2195 EXPORT_SYMBOL(fc_eh_device_reset);
2196 
2197 /**
2198  * fc_eh_host_reset() - Reset a Scsi_Host.
2199  * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2200  */
2201 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2202 {
2203         struct Scsi_Host *shost = sc_cmd->device->host;
2204         struct fc_lport *lport = shost_priv(shost);
2205         unsigned long wait_tmo;
2206 
2207         FC_SCSI_DBG(lport, "Resetting host\n");
2208 
2209         fc_lport_reset(lport);
2210         wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2211         while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2212                                                                wait_tmo))
2213                 msleep(1000);
2214 
2215         if (fc_fcp_lport_queue_ready(lport)) {
2216                 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2217                              "on port (%6.6x)\n", lport->port_id);
2218                 return SUCCESS;
2219         } else {
2220                 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2221                              "port (%6.6x) is not ready.\n",
2222                              lport->port_id);
2223                 return FAILED;
2224         }
2225 }
2226 EXPORT_SYMBOL(fc_eh_host_reset);
2227 
2228 /**
2229  * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2230  * @sdev: The SCSI device that identifies the SCSI host
2231  *
2232  * Configures queue depth based on host's cmd_per_len. If not set
2233  * then we use the libfc default.
2234  */
2235 int fc_slave_alloc(struct scsi_device *sdev)
2236 {
2237         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2238 
2239         if (!rport || fc_remote_port_chkready(rport))
2240                 return -ENXIO;
2241 
2242         scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2243         return 0;
2244 }
2245 EXPORT_SYMBOL(fc_slave_alloc);
2246 
2247 /**
2248  * fc_fcp_destory() - Tear down the FCP layer for a given local port
2249  * @lport: The local port that no longer needs the FCP layer
2250  */
2251 void fc_fcp_destroy(struct fc_lport *lport)
2252 {
2253         struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2254 
2255         if (!list_empty(&si->scsi_pkt_queue))
2256                 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2257                        "port (%6.6x)\n", lport->port_id);
2258 
2259         mempool_destroy(si->scsi_pkt_pool);
2260         kfree(si);
2261         lport->scsi_priv = NULL;
2262 }
2263 EXPORT_SYMBOL(fc_fcp_destroy);
2264 
2265 int fc_setup_fcp(void)
2266 {
2267         int rc = 0;
2268 
2269         scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2270                                             sizeof(struct fc_fcp_pkt),
2271                                             0, SLAB_HWCACHE_ALIGN, NULL);
2272         if (!scsi_pkt_cachep) {
2273                 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2274                        "module load failed!");
2275                 rc = -ENOMEM;
2276         }
2277 
2278         return rc;
2279 }
2280 
2281 void fc_destroy_fcp(void)
2282 {
2283         kmem_cache_destroy(scsi_pkt_cachep);
2284 }
2285 
2286 /**
2287  * fc_fcp_init() - Initialize the FCP layer for a local port
2288  * @lport: The local port to initialize the exchange layer for
2289  */
2290 int fc_fcp_init(struct fc_lport *lport)
2291 {
2292         int rc;
2293         struct fc_fcp_internal *si;
2294 
2295         if (!lport->tt.fcp_cmd_send)
2296                 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2297 
2298         if (!lport->tt.fcp_cleanup)
2299                 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2300 
2301         if (!lport->tt.fcp_abort_io)
2302                 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2303 
2304         si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2305         if (!si)
2306                 return -ENOMEM;
2307         lport->scsi_priv = si;
2308         si->max_can_queue = lport->host->can_queue;
2309         INIT_LIST_HEAD(&si->scsi_pkt_queue);
2310         spin_lock_init(&si->scsi_queue_lock);
2311 
2312         si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2313         if (!si->scsi_pkt_pool) {
2314                 rc = -ENOMEM;
2315                 goto free_internal;
2316         }
2317         return 0;
2318 
2319 free_internal:
2320         kfree(si);
2321         return rc;
2322 }
2323 EXPORT_SYMBOL(fc_fcp_init);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/scsi/libfc/fc_fcp.c

DEFINITIONS
