drivers/scsi/qla2xxx/qla_rscn.c

   1 /*
   2  *                  QLOGIC LINUX SOFTWARE
   3  *
   4  * QLogic ISP2x00 device driver for Linux 2.6.x
   5  * Copyright (C) 2003-2005 QLogic Corporation
   6  * (www.qlogic.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2, or (at your option) any
  11  * later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  */
  19 #include "qla_def.h"
  20
  21 /**
  22  * IO descriptor handle definitions.
  23  *
  24  * Signature form:
  25  *
  26  *      |31------28|27-------------------12|11-------0|
  27  *      |   Type   |   Rolling Signature   |   Index  |
  28  *      |----------|-----------------------|----------|
  29  *
  30  **/
  31
  32 #define HDL_TYPE_SCSI           0
  33 #define HDL_TYPE_ASYNC_IOCB     0x0A
  34
  35 #define HDL_INDEX_BITS  12
  36 #define HDL_ITER_BITS   16
  37 #define HDL_TYPE_BITS   4
  38
  39 #define HDL_INDEX_MASK  ((1UL << HDL_INDEX_BITS) - 1)
  40 #define HDL_ITER_MASK   ((1UL << HDL_ITER_BITS) - 1)
  41 #define HDL_TYPE_MASK   ((1UL << HDL_TYPE_BITS) - 1)
  42
  43 #define HDL_INDEX_SHIFT 0
  44 #define HDL_ITER_SHIFT  (HDL_INDEX_SHIFT + HDL_INDEX_BITS)
  45 #define HDL_TYPE_SHIFT  (HDL_ITER_SHIFT + HDL_ITER_BITS)
  46
  47 /* Local Prototypes. */
  48 static inline uint32_t qla2x00_to_handle(uint16_t, uint16_t, uint16_t);
  49 static inline uint16_t qla2x00_handle_to_idx(uint32_t);
  50 static inline uint32_t qla2x00_iodesc_to_handle(struct io_descriptor *);
  51 static inline struct io_descriptor *qla2x00_handle_to_iodesc(scsi_qla_host_t *,
  52     uint32_t);
  53
  54 static inline struct io_descriptor *qla2x00_alloc_iodesc(scsi_qla_host_t *);
  55 static inline void qla2x00_free_iodesc(struct io_descriptor *);
  56 static inline void qla2x00_init_io_descriptors(scsi_qla_host_t *);
  57
  58 static void qla2x00_iodesc_timeout(unsigned long);
  59 static inline void qla2x00_add_iodesc_timer(struct io_descriptor *);
  60 static inline void qla2x00_remove_iodesc_timer(struct io_descriptor *);
  61
  62 static inline void qla2x00_update_login_fcport(scsi_qla_host_t *,
  63     struct mbx_entry *, fc_port_t *);
  64
  65 static int qla2x00_send_abort_iocb(scsi_qla_host_t *, struct io_descriptor *,
  66     uint32_t, int);
  67 static int qla2x00_send_abort_iocb_cb(scsi_qla_host_t *, struct io_descriptor *,
  68     struct mbx_entry *);
  69
  70 static int qla2x00_send_adisc_iocb(scsi_qla_host_t *, struct io_descriptor *,
  71     int);
  72 static int qla2x00_send_adisc_iocb_cb(scsi_qla_host_t *, struct io_descriptor *,
  73     struct mbx_entry *);
  74
  75 static int qla2x00_send_logout_iocb(scsi_qla_host_t *, struct io_descriptor *,
  76     int);
  77 static int qla2x00_send_logout_iocb_cb(scsi_qla_host_t *,
  78     struct io_descriptor *, struct mbx_entry *);
  79
  80 static int qla2x00_send_login_iocb(scsi_qla_host_t *, struct io_descriptor *,
  81     port_id_t *, int);
  82 static int qla2x00_send_login_iocb_cb(scsi_qla_host_t *, struct io_descriptor *,
  83     struct mbx_entry *);
  84
  85 /**
  86  * Mailbox IOCB callback array.
  87  **/
  88 static int (*iocb_function_cb_list[LAST_IOCB_CB])
  89         (scsi_qla_host_t *, struct io_descriptor *, struct mbx_entry *) = {
  90
  91         qla2x00_send_abort_iocb_cb,
  92         qla2x00_send_adisc_iocb_cb,
  93         qla2x00_send_logout_iocb_cb,
  94         qla2x00_send_login_iocb_cb,
  95 };
  96
  97
  98 /**
  99  * Generic IO descriptor handle routines.
 100  **/
 101
 102 /**
 103  * qla2x00_to_handle() - Create a descriptor handle.
 104  * @type: descriptor type
 105  * @iter: descriptor rolling signature
 106  * @idx: index to the descriptor array
 107  *
 108  * Returns a composite handle based in the @type, @iter, and @idx.
 109  */
 110 static inline uint32_t
 111 qla2x00_to_handle(uint16_t type, uint16_t iter, uint16_t idx)
 112 {
 113         return ((uint32_t)(((uint32_t)type << HDL_TYPE_SHIFT) |
 114             ((uint32_t)iter << HDL_ITER_SHIFT) |
 115             ((uint32_t)idx << HDL_INDEX_SHIFT)));
 116 }
 117
 118 /**
 119  * qla2x00_handle_to_idx() - Retrive the index for a given handle.
 120  * @handle: descriptor handle
 121  *
 122  * Returns the index specified by the @handle.
 123  */
 124 static inline uint16_t
 125 qla2x00_handle_to_idx(uint32_t handle)
 126 {
 127         return ((uint16_t)(((handle) >> HDL_INDEX_SHIFT) & HDL_INDEX_MASK));
 128 }
 129
 130 /**
 131  * qla2x00_iodesc_to_handle() - Convert an IO descriptor to a unique handle.
 132  * @iodesc: io descriptor
 133  *
 134  * Returns a unique handle for @iodesc.
 135  */
 136 static inline uint32_t
 137 qla2x00_iodesc_to_handle(struct io_descriptor *iodesc)
 138 {
 139         uint32_t handle;
 140
 141         handle = qla2x00_to_handle(HDL_TYPE_ASYNC_IOCB,
 142             ++iodesc->ha->iodesc_signature, iodesc->idx);
 143         iodesc->signature = handle;
 144
 145         return (handle);
 146 }
 147
 148 /**
 149  * qla2x00_handle_to_iodesc() - Retrieve an IO descriptor given a unique handle.
 150  * @ha: HA context
 151  * @handle: handle to io descriptor
 152  *
 153  * Returns a pointer to the io descriptor, or NULL, if the io descriptor does
 154  * not exist or the io descriptors signature does not @handle.
 155  */
 156 static inline struct io_descriptor *
 157 qla2x00_handle_to_iodesc(scsi_qla_host_t *ha, uint32_t handle)
 158 {
 159         uint16_t idx;
 160         struct io_descriptor *iodesc;
 161
 162         idx = qla2x00_handle_to_idx(handle);
 163         iodesc = &ha->io_descriptors[idx];
 164         if (iodesc)
 165                 if (iodesc->signature != handle)
 166                         iodesc = NULL;
 167
 168         return (iodesc);
 169 }
 170
 171
 172 /**
 173  * IO descriptor allocation routines.
 174  **/
 175
 176 /**
 177  * qla2x00_alloc_iodesc() - Allocate an IO descriptor from the pool.
 178  * @ha: HA context
 179  *
 180  * Returns a pointer to the allocated io descriptor, or NULL, if none available.
 181  */
 182 static inline struct io_descriptor *
 183 qla2x00_alloc_iodesc(scsi_qla_host_t *ha)
 184 {
 185         uint16_t iter;
 186         struct io_descriptor *iodesc;
 187
 188         iodesc = NULL;
 189         for (iter = 0; iter < MAX_IO_DESCRIPTORS; iter++) {
 190                 if (ha->io_descriptors[iter].used)
 191                         continue;
 192
 193                 iodesc = &ha->io_descriptors[iter];
 194                 iodesc->used = 1;
 195                 iodesc->idx = iter;
 196                 init_timer(&iodesc->timer);
 197                 iodesc->ha = ha;
 198                 iodesc->signature = qla2x00_iodesc_to_handle(iodesc);
 199                 break;
 200         }
 201
 202         return (iodesc);
 203 }
 204
 205 /**
 206  * qla2x00_free_iodesc() - Free an IO descriptor.
 207  * @iodesc: io descriptor
 208  *
 209  * NOTE: The io descriptors timer *must* be stopped before it can be free'd.
 210  */
 211 static inline void
 212 qla2x00_free_iodesc(struct io_descriptor *iodesc)
 213 {
 214         iodesc->used = 0;
 215         iodesc->signature = 0;
 216 }
 217
 218 /**
 219  * qla2x00_remove_iodesc_timer() - Remove an active timer from an IO descriptor.
 220  * @iodesc: io descriptor
 221  */
 222 static inline void
 223 qla2x00_remove_iodesc_timer(struct io_descriptor *iodesc)
 224 {
 225         if (iodesc->timer.function != NULL) {
 226                 del_timer_sync(&iodesc->timer);
 227                 iodesc->timer.data = (unsigned long) NULL;
 228                 iodesc->timer.function = NULL;
 229         }
 230 }
 231
 232 /**
 233  * qla2x00_init_io_descriptors() - Initialize the pool of IO descriptors.
 234  * @ha: HA context
 235  */
 236 static inline void
 237 qla2x00_init_io_descriptors(scsi_qla_host_t *ha)
 238 {
 239         uint16_t iter;
 240
 241         for (iter = 0; iter < MAX_IO_DESCRIPTORS; iter++) {
 242                 if (!ha->io_descriptors[iter].used)
 243                         continue;
 244
 245                 qla2x00_remove_iodesc_timer(&ha->io_descriptors[iter]);
 246                 qla2x00_free_iodesc(&ha->io_descriptors[iter]);
 247         }
 248 }
 249
 250
 251 /**
 252  * IO descriptor timer routines.
 253  **/
 254
 255 /**
 256  * qla2x00_iodesc_timeout() - Timeout IO descriptor handler.
 257  * @data: io descriptor
 258  */
 259 static void
 260 qla2x00_iodesc_timeout(unsigned long data)
 261 {
 262         struct io_descriptor *iodesc;
 263
 264         iodesc = (struct io_descriptor *) data;
 265
 266         DEBUG14(printk("scsi(%ld): IO descriptor timeout, index=%x "
 267             "signature=%08x, scheduling ISP abort.\n", iodesc->ha->host_no,
 268             iodesc->idx, iodesc->signature));
 269
 270         qla2x00_free_iodesc(iodesc);
 271
 272         qla_printk(KERN_WARNING, iodesc->ha,
 273             "IO descriptor timeout. Scheduling ISP abort.\n");
 274         set_bit(ISP_ABORT_NEEDED, &iodesc->ha->dpc_flags);
 275 }
 276
 277 /**
 278  * qla2x00_add_iodesc_timer() - Add and start a timer for an IO descriptor.
 279  * @iodesc: io descriptor
 280  *
 281  * NOTE:
 282  * The firmware shall timeout an outstanding mailbox IOCB in 2 * R_A_TOV (in
 283  * tenths of a second) after it hits the wire.  But, if there are any request
 284  * resource contraints (i.e. during heavy I/O), exchanges can be held off for
 285  * at most R_A_TOV.  Therefore, the driver will wait 4 * R_A_TOV before
 286  * scheduling a recovery (big hammer).
 287  */
 288 static inline void
 289 qla2x00_add_iodesc_timer(struct io_descriptor *iodesc)
 290 {
 291         unsigned long timeout;
 292
 293         timeout = (iodesc->ha->r_a_tov * 4) / 10;
 294         init_timer(&iodesc->timer);
 295         iodesc->timer.data = (unsigned long) iodesc;
 296         iodesc->timer.expires = jiffies + (timeout * HZ);
 297         iodesc->timer.function =
 298             (void (*) (unsigned long)) qla2x00_iodesc_timeout;
 299         add_timer(&iodesc->timer);
 300 }
 301
 302 /**
 303  * IO descriptor support routines.
 304  **/
 305
 306 /**
 307  * qla2x00_update_login_fcport() - Update fcport data after login processing.
 308  * @ha: HA context
 309  * @mbxstat: Mailbox command status IOCB
 310  * @fcport: port to update
 311  */
 312 static inline void
 313 qla2x00_update_login_fcport(scsi_qla_host_t *ha, struct mbx_entry *mbxstat,
 314     fc_port_t *fcport)
 315 {
 316         if (le16_to_cpu(mbxstat->mb1) & BIT_0) {
 317                 fcport->port_type = FCT_INITIATOR;
 318         } else {
 319                 fcport->port_type = FCT_TARGET;
 320                 if (le16_to_cpu(mbxstat->mb1) & BIT_1) {
 321                         fcport->flags |= FCF_TAPE_PRESENT;
 322                 }
 323         }
 324         fcport->login_retry = 0;
 325         fcport->port_login_retry_count = ha->port_down_retry_count *
 326             PORT_RETRY_TIME;
 327         atomic_set(&fcport->port_down_timer, ha->port_down_retry_count *
 328             PORT_RETRY_TIME);
 329         fcport->flags |= FCF_FABRIC_DEVICE;
 330         fcport->flags &= ~FCF_FAILOVER_NEEDED;
 331         fcport->iodesc_idx_sent = IODESC_INVALID_INDEX;
 332         atomic_set(&fcport->state, FCS_ONLINE);
 333 }
 334
 335
 336 /**
 337  * Mailbox IOCB commands.
 338  **/
 339
 340 /**
 341  * qla2x00_get_mbx_iocb_entry() - Retrieve an IOCB from the request queue.
 342  * @ha: HA context
 343  * @handle: handle to io descriptor
 344  *
 345  * Returns a pointer to the reqest entry, or NULL, if none were available.
 346  */
 347 static inline struct mbx_entry *
 348 qla2x00_get_mbx_iocb_entry(scsi_qla_host_t *ha, uint32_t handle)
 349 {
 350         uint16_t cnt;
 351         struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;
 352         struct mbx_entry *mbxentry;
 353
 354         mbxentry = NULL;
 355
 356         if (ha->req_q_cnt < 3) {
 357                 cnt = qla2x00_debounce_register(ISP_REQ_Q_OUT(ha, reg));
 358                 if  (ha->req_ring_index < cnt)
 359                         ha->req_q_cnt = cnt - ha->req_ring_index;
 360                 else
 361                         ha->req_q_cnt = ha->request_q_length -
 362                             (ha->req_ring_index - cnt);
 363         }
 364         if (ha->req_q_cnt >= 3) {
 365                 mbxentry = (struct mbx_entry *)ha->request_ring_ptr;
 366
 367                 memset(mbxentry, 0, sizeof(struct mbx_entry));
 368                 mbxentry->entry_type = MBX_IOCB_TYPE;
 369                 mbxentry->entry_count = 1;
 370                 mbxentry->sys_define1 = SOURCE_ASYNC_IOCB;
 371                 mbxentry->handle = handle;
 372         }
 373         return (mbxentry);
 374 }
 375
 376 /**
 377  * qla2x00_send_abort_iocb() - Issue an abort IOCB to the firmware.
 378  * @ha: HA context
 379  * @iodesc: io descriptor
 380  * @handle_to_abort: firmware handle to abort
 381  * @ha_locked: is function called with the hardware lock
 382  *
 383  * Returns QLA_SUCCESS if the IOCB was issued.
 384  */
 385 static int
 386 qla2x00_send_abort_iocb(scsi_qla_host_t *ha, struct io_descriptor *iodesc,
 387     uint32_t handle_to_abort, int ha_locked)
 388 {
 389         unsigned long flags = 0;
 390         struct mbx_entry *mbxentry;
 391
 392         /* Send marker if required. */
 393         if (qla2x00_issue_marker(ha, ha_locked) != QLA_SUCCESS)
 394                 return (QLA_FUNCTION_FAILED);
 395
 396         if (!ha_locked)
 397                 spin_lock_irqsave(&ha->hardware_lock, flags);
 398
 399         /* Build abort mailbox IOCB. */
 400         mbxentry = qla2x00_get_mbx_iocb_entry(ha, iodesc->signature);
 401         if (mbxentry == NULL) {
 402                 if (!ha_locked)
 403                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 404
 405                 return (QLA_FUNCTION_FAILED);
 406         }
 407         mbxentry->mb0 = __constant_cpu_to_le16(MBC_ABORT_COMMAND);
 408         mbxentry->mb1 = mbxentry->loop_id.extended =
 409             cpu_to_le16(iodesc->remote_fcport->loop_id);
 410         mbxentry->mb2 = LSW(handle_to_abort);
 411         mbxentry->mb3 = MSW(handle_to_abort);
 412         wmb();
 413
 414         qla2x00_add_iodesc_timer(iodesc);
 415
 416         /* Issue command to ISP. */
 417         qla2x00_isp_cmd(ha);
 418
 419         if (!ha_locked)
 420                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 421
 422         DEBUG14(printk("scsi(%ld): Sending Abort IOCB (%08x) to [%x], aborting "
 423             "%08x.\n", ha->host_no, iodesc->signature,
 424             iodesc->remote_fcport->loop_id, handle_to_abort));
 425
 426         return (QLA_SUCCESS);
 427 }
 428
 429 /**
 430  * qla2x00_send_abort_iocb_cb() - Abort IOCB callback.
 431  * @ha: HA context
 432  * @iodesc: io descriptor
 433  * @mbxstat: mailbox status IOCB
 434  *
 435  * Returns QLA_SUCCESS if @iodesc can be freed by the caller, else, @iodesc
 436  * will be used for a retry.
 437  */
 438 static int
 439 qla2x00_send_abort_iocb_cb(scsi_qla_host_t *ha, struct io_descriptor *iodesc,
 440     struct mbx_entry *mbxstat)
 441 {
 442         DEBUG14(printk("scsi(%ld): Abort IOCB -- sent to [%x/%02x%02x%02x], "
 443             "status=%x mb0=%x.\n", ha->host_no, iodesc->remote_fcport->loop_id,
 444             iodesc->d_id.b.domain, iodesc->d_id.b.area, iodesc->d_id.b.al_pa,
 445             le16_to_cpu(mbxstat->status), le16_to_cpu(mbxstat->mb0)));
 446
 447         return (QLA_SUCCESS);
 448 }
 449
 450
 451 /**
 452  * qla2x00_send_adisc_iocb() - Issue a Get Port Database IOCB to the firmware.
 453  * @ha: HA context
 454  * @iodesc: io descriptor
 455  * @ha_locked: is function called with the hardware lock
 456  *
 457  * Returns QLA_SUCCESS if the IOCB was issued.
 458  */
 459 static int
 460 qla2x00_send_adisc_iocb(scsi_qla_host_t *ha, struct io_descriptor *iodesc,
 461     int ha_locked)
 462 {
 463         unsigned long flags = 0;
 464         struct mbx_entry *mbxentry;
 465
 466         /* Send marker if required. */
 467         if (qla2x00_issue_marker(ha, ha_locked) != QLA_SUCCESS)
 468                 return (QLA_FUNCTION_FAILED);
 469
 470         if (!ha_locked)
 471                 spin_lock_irqsave(&ha->hardware_lock, flags);
 472
 473         /* Build Get Port Database IOCB. */
 474         mbxentry = qla2x00_get_mbx_iocb_entry(ha, iodesc->signature);
 475         if (mbxentry == NULL) {
 476                 if (!ha_locked)
 477                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 478
 479                 return (QLA_FUNCTION_FAILED);
 480         }
 481         mbxentry->mb0 = __constant_cpu_to_le16(MBC_GET_PORT_DATABASE);
 482         mbxentry->mb1 = mbxentry->loop_id.extended =
 483             cpu_to_le16(iodesc->remote_fcport->loop_id);
 484         mbxentry->mb2 = cpu_to_le16(MSW(LSD(ha->iodesc_pd_dma)));
 485         mbxentry->mb3 = cpu_to_le16(LSW(LSD(ha->iodesc_pd_dma)));
 486         mbxentry->mb6 = cpu_to_le16(MSW(MSD(ha->iodesc_pd_dma)));
 487         mbxentry->mb7 = cpu_to_le16(LSW(MSD(ha->iodesc_pd_dma)));
 488         mbxentry->mb10 = __constant_cpu_to_le16(BIT_0);
 489         wmb();
 490
 491         qla2x00_add_iodesc_timer(iodesc);
 492
 493         /* Issue command to ISP. */
 494         qla2x00_isp_cmd(ha);
 495
 496         if (!ha_locked)
 497                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 498
 499         DEBUG14(printk("scsi(%ld): Sending Adisc IOCB (%08x) to [%x].\n",
 500             ha->host_no, iodesc->signature, iodesc->remote_fcport->loop_id));
 501
 502         return (QLA_SUCCESS);
 503 }
 504
 505 /**
 506  * qla2x00_send_adisc_iocb_cb() - Get Port Database IOCB callback.
 507  * @ha: HA context
 508  * @iodesc: io descriptor
 509  * @mbxstat: mailbox status IOCB
 510  *
 511  * Returns QLA_SUCCESS if @iodesc can be freed by the caller, else, @iodesc
 512  * will be used for a retry.
 513  */
 514 static int
 515 qla2x00_send_adisc_iocb_cb(scsi_qla_host_t *ha, struct io_descriptor *iodesc,
 516     struct mbx_entry *mbxstat)
 517 {
 518         fc_port_t *remote_fcport;
 519
 520         remote_fcport = iodesc->remote_fcport;
 521
 522         /* Ensure the port IDs are consistent. */
 523         if (remote_fcport->d_id.b24 != iodesc->d_id.b24) {
 524                 DEBUG14(printk("scsi(%ld): Adisc IOCB -- ignoring, remote port "
 525                     "id changed from [%02x%02x%02x] to [%02x%02x%02x].\n",
 526                     ha->host_no, remote_fcport->d_id.b.domain,
 527                     remote_fcport->d_id.b.area, remote_fcport->d_id.b.al_pa,
 528                     iodesc->d_id.b.domain, iodesc->d_id.b.area,
 529                     iodesc->d_id.b.al_pa));
 530
 531                 return (QLA_SUCCESS);
 532         }
 533
 534         /* Only process the last command. */
 535         if (remote_fcport->iodesc_idx_sent != iodesc->idx) {
 536                 DEBUG14(printk("scsi(%ld): Adisc IOCB -- ignoring, sent to "
 537                     "[%02x%02x%02x], expected %x, received %x.\n", ha->host_no,
 538                     iodesc->d_id.b.domain, iodesc->d_id.b.area,
 539                     iodesc->d_id.b.al_pa, remote_fcport->iodesc_idx_sent,
 540                     iodesc->idx));
 541
 542                 return (QLA_SUCCESS);
 543         }
 544
 545         if (le16_to_cpu(mbxstat->status) == CS_COMPLETE) {
 546                 DEBUG14(printk("scsi(%ld): Adisc IOCB -- marking "
 547                     "[%x/%02x%02x%02x] online.\n", ha->host_no,
 548                     remote_fcport->loop_id, remote_fcport->d_id.b.domain,
 549                     remote_fcport->d_id.b.area, remote_fcport->d_id.b.al_pa));
 550
 551                 atomic_set(&remote_fcport->state, FCS_ONLINE);
 552         } else {
 553                 DEBUG14(printk("scsi(%ld): Adisc IOCB -- marking "
 554                     "[%x/%02x%02x%02x] lost, status=%x mb0=%x.\n", ha->host_no,
 555                     remote_fcport->loop_id, remote_fcport->d_id.b.domain,
 556                     remote_fcport->d_id.b.area, remote_fcport->d_id.b.al_pa,
 557                     le16_to_cpu(mbxstat->status), le16_to_cpu(mbxstat->mb0)));
 558
 559                 if (atomic_read(&remote_fcport->state) != FCS_DEVICE_DEAD)
 560                         atomic_set(&remote_fcport->state, FCS_DEVICE_LOST);
 561         }
 562         remote_fcport->iodesc_idx_sent = IODESC_INVALID_INDEX;
 563
 564         return (QLA_SUCCESS);
 565 }
 566
 567
 568 /**
 569  * qla2x00_send_logout_iocb() - Issue a fabric port logout IOCB to the firmware.
 570  * @ha: HA context
 571  * @iodesc: io descriptor
 572  * @ha_locked: is function called with the hardware lock
 573  *
 574  * Returns QLA_SUCCESS if the IOCB was issued.
 575  */
 576 static int
 577 qla2x00_send_logout_iocb(scsi_qla_host_t *ha, struct io_descriptor *iodesc,
 578     int ha_locked)
 579 {
 580         unsigned long flags = 0;
 581         struct mbx_entry *mbxentry;
 582
 583         /* Send marker if required. */
 584         if (qla2x00_issue_marker(ha, ha_locked) != QLA_SUCCESS)
 585                 return (QLA_FUNCTION_FAILED);
 586
 587         if (!ha_locked)
 588                 spin_lock_irqsave(&ha->hardware_lock, flags);
 589
 590         /* Build fabric port logout mailbox IOCB. */
 591         mbxentry = qla2x00_get_mbx_iocb_entry(ha, iodesc->signature);
 592         if (mbxentry == NULL) {
 593                 if (!ha_locked)
 594                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 595
 596                 return (QLA_FUNCTION_FAILED);
 597         }
 598         mbxentry->mb0 = __constant_cpu_to_le16(MBC_LOGOUT_FABRIC_PORT);
 599         mbxentry->mb1 = mbxentry->loop_id.extended =
 600             cpu_to_le16(iodesc->remote_fcport->loop_id);
 601         wmb();
 602
 603         qla2x00_add_iodesc_timer(iodesc);
 604
 605         /* Issue command to ISP. */
 606         qla2x00_isp_cmd(ha);
 607
 608         if (!ha_locked)
 609                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 610
 611         DEBUG14(printk("scsi(%ld): Sending Logout IOCB (%08x) to [%x].\n",
 612             ha->host_no, iodesc->signature, iodesc->remote_fcport->loop_id));
 613
 614         return (QLA_SUCCESS);
 615 }
 616
 617 /**
 618  * qla2x00_send_logout_iocb_cb() - Fabric port logout IOCB callback.
 619  * @ha: HA context
 620  * @iodesc: io descriptor
 621  * @mbxstat: mailbox status IOCB
 622  *
 623  * Returns QLA_SUCCESS if @iodesc can be freed by the caller, else, @iodesc
 624  * will be used for a retry.
 625  */
 626 static int
 627 qla2x00_send_logout_iocb_cb(scsi_qla_host_t *ha, struct io_descriptor *iodesc,
 628     struct mbx_entry *mbxstat)
 629 {
 630         DEBUG14(printk("scsi(%ld): Logout IOCB -- sent to [%x/%02x%02x%02x], "
 631             "status=%x mb0=%x mb1=%x.\n", ha->host_no,
 632             iodesc->remote_fcport->loop_id,
 633             iodesc->remote_fcport->d_id.b.domain,
 634             iodesc->remote_fcport->d_id.b.area,
 635             iodesc->remote_fcport->d_id.b.al_pa, le16_to_cpu(mbxstat->status),
 636             le16_to_cpu(mbxstat->mb0), le16_to_cpu(mbxstat->mb1)));
 637
 638         return (QLA_SUCCESS);
 639 }
 640
 641
 642 /**
 643  * qla2x00_send_login_iocb() - Issue a fabric port login IOCB to the firmware.
 644  * @ha: HA context
 645  * @iodesc: io descriptor
 646  * @d_id: port id for device
 647  * @ha_locked: is function called with the hardware lock
 648  *
 649  * Returns QLA_SUCCESS if the IOCB was issued.
 650  */
 651 static int
 652 qla2x00_send_login_iocb(scsi_qla_host_t *ha, struct io_descriptor *iodesc,
 653     port_id_t *d_id, int ha_locked)
 654 {
 655         unsigned long flags = 0;
 656         struct mbx_entry *mbxentry;
 657
 658         /* Send marker if required. */
 659         if (qla2x00_issue_marker(ha, ha_locked) != QLA_SUCCESS)
 660                 return (QLA_FUNCTION_FAILED);
 661
 662         if (!ha_locked)
 663                 spin_lock_irqsave(&ha->hardware_lock, flags);
 664
 665         /* Build fabric port login mailbox IOCB. */
 666         mbxentry = qla2x00_get_mbx_iocb_entry(ha, iodesc->signature);
 667         if (mbxentry == NULL) {
 668                 if (!ha_locked)
 669                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 670
 671                 return (QLA_FUNCTION_FAILED);
 672         }
 673         mbxentry->mb0 = __constant_cpu_to_le16(MBC_LOGIN_FABRIC_PORT);
 674         mbxentry->mb1 = mbxentry->loop_id.extended =
 675             cpu_to_le16(iodesc->remote_fcport->loop_id);
 676         mbxentry->mb2 = cpu_to_le16(d_id->b.domain);
 677         mbxentry->mb3 = cpu_to_le16(d_id->b.area << 8 | d_id->b.al_pa);
 678         mbxentry->mb10 = __constant_cpu_to_le16(BIT_0);
 679         wmb();
 680
 681         qla2x00_add_iodesc_timer(iodesc);
 682
 683         /* Issue command to ISP. */
 684         qla2x00_isp_cmd(ha);
 685
 686         if (!ha_locked)
 687                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 688
 689         DEBUG14(printk("scsi(%ld): Sending Login IOCB (%08x) to "
 690             "[%x/%02x%02x%02x].\n", ha->host_no, iodesc->signature,
 691             iodesc->remote_fcport->loop_id, d_id->b.domain, d_id->b.area,
 692             d_id->b.al_pa));
 693
 694         return (QLA_SUCCESS);
 695 }
 696
 697 /**
 698  * qla2x00_send_login_iocb_cb() - Fabric port logout IOCB callback.
 699  * @ha: HA context
 700  * @iodesc: io descriptor
 701  * @mbxstat: mailbox status IOCB
 702  *
 703  * Returns QLA_SUCCESS if @iodesc can be freed by the caller, else, @iodesc
 704  * will be used for a retry.
 705  */
 706 static int
 707 qla2x00_send_login_iocb_cb(scsi_qla_host_t *ha, struct io_descriptor *iodesc,
 708     struct mbx_entry *mbxstat)
 709 {
 710         int rval;
 711         fc_port_t *fcport, *remote_fcport, *exist_fcport;
 712         struct io_descriptor *abort_iodesc, *login_iodesc;
 713         uint16_t status, mb[8];
 714         uint16_t reuse;
 715         uint16_t remote_loopid;
 716         port_id_t remote_did, inuse_did;
 717
 718         remote_fcport = iodesc->remote_fcport;
 719
 720         /* Only process the last command. */
 721         if (remote_fcport->iodesc_idx_sent != iodesc->idx) {
 722                 DEBUG14(printk("scsi(%ld): Login IOCB -- ignoring, sent to "
 723                     "[%02x%02x%02x], expected %x, received %x.\n",
 724                     ha->host_no, iodesc->d_id.b.domain, iodesc->d_id.b.area,
 725                     iodesc->d_id.b.al_pa, remote_fcport->iodesc_idx_sent,
 726                     iodesc->idx));
 727
 728                 /* Free RSCN fcport resources. */
 729                 if (remote_fcport->port_type == FCT_RSCN) {
 730                         DEBUG14(printk("scsi(%ld): Login IOCB -- Freeing RSCN "
 731                             "fcport %p [%x/%02x%02x%02x] given ignored Login "
 732                             "IOCB.\n", ha->host_no, remote_fcport,
 733                             remote_fcport->loop_id,
 734                             remote_fcport->d_id.b.domain,
 735                             remote_fcport->d_id.b.area,
 736                             remote_fcport->d_id.b.al_pa));
 737
 738                         list_del(&remote_fcport->list);
 739                         kfree(remote_fcport);
 740                 }
 741                 return (QLA_SUCCESS);
 742         }
 743
 744         status = le16_to_cpu(mbxstat->status);
 745         mb[0] = le16_to_cpu(mbxstat->mb0);
 746         mb[1] = le16_to_cpu(mbxstat->mb1);
 747         mb[2] = le16_to_cpu(mbxstat->mb2);
 748         mb[6] = le16_to_cpu(mbxstat->mb6);
 749         mb[7] = le16_to_cpu(mbxstat->mb7);
 750
 751         /* Good status? */
 752         if ((status == CS_COMPLETE || status == CS_COMPLETE_CHKCOND) &&
 753             mb[0] == MBS_COMMAND_COMPLETE) {
 754
 755                 DEBUG14(printk("scsi(%ld): Login IOCB -- status=%x mb1=%x pn="
 756                     "%02x%02x%02x%02x%02x%02x%02x%02x.\n", ha->host_no, status,
 757                     mb[1], mbxstat->port_name[0], mbxstat->port_name[1],
 758                     mbxstat->port_name[2], mbxstat->port_name[3],
 759                     mbxstat->port_name[4], mbxstat->port_name[5],
 760                     mbxstat->port_name[6], mbxstat->port_name[7]));
 761
 762                 memcpy(remote_fcport->node_name, mbxstat->node_name, WWN_SIZE);
 763                 memcpy(remote_fcport->port_name, mbxstat->port_name, WWN_SIZE);
 764
 765                 /* Is the device already in our fcports list? */
 766                 if (remote_fcport->port_type != FCT_RSCN) {
 767                         DEBUG14(printk("scsi(%ld): Login IOCB -- marking "
 768                             "[%x/%02x%02x%02x] online.\n", ha->host_no,
 769                             remote_fcport->loop_id,
 770                             remote_fcport->d_id.b.domain,
 771                             remote_fcport->d_id.b.area,
 772                             remote_fcport->d_id.b.al_pa));
 773
 774                         qla2x00_update_login_fcport(ha, mbxstat, remote_fcport);
 775
 776                         return (QLA_SUCCESS);
 777                 }
 778
 779                 /* Does the RSCN portname already exist in our fcports list? */
 780                 exist_fcport = NULL;
 781                 list_for_each_entry(fcport, &ha->fcports, list) {
 782                         if (memcmp(remote_fcport->port_name, fcport->port_name,
 783                             WWN_SIZE) == 0) {
 784                                 exist_fcport = fcport;
 785                                 break;
 786                         }
 787                 }
 788                 if (exist_fcport != NULL) {
 789                         DEBUG14(printk("scsi(%ld): Login IOCB -- found RSCN "
 790                             "fcport in fcports list [%p].\n", ha->host_no,
 791                             exist_fcport));
 792
 793                         /* Abort any ADISC that could have been sent. */
 794                         if (exist_fcport->iodesc_idx_sent != iodesc->idx &&
 795                             exist_fcport->iodesc_idx_sent <
 796                             MAX_IO_DESCRIPTORS &&
 797                             ha->io_descriptors[exist_fcport->iodesc_idx_sent].
 798                             cb_idx == ADISC_PORT_IOCB_CB) {
 799
 800                                 abort_iodesc = qla2x00_alloc_iodesc(ha);
 801                                 if (abort_iodesc) {
 802                                         DEBUG14(printk("scsi(%ld): Login IOCB "
 803                                             "-- issuing abort to outstanding "
 804                                             "Adisc [%x/%02x%02x%02x].\n",
 805                                             ha->host_no, remote_fcport->loop_id,
 806                                             exist_fcport->d_id.b.domain,
 807                                             exist_fcport->d_id.b.area,
 808                                             exist_fcport->d_id.b.al_pa));
 809
 810                                         abort_iodesc->cb_idx = ABORT_IOCB_CB;
 811                                         abort_iodesc->d_id.b24 =
 812                                             exist_fcport->d_id.b24;
 813                                         abort_iodesc->remote_fcport =
 814                                             exist_fcport;
 815                                         exist_fcport->iodesc_idx_sent =
 816                                             abort_iodesc->idx;
 817                                         qla2x00_send_abort_iocb(ha,
 818                                             abort_iodesc, ha->io_descriptors[
 819                                              exist_fcport->iodesc_idx_sent].
 820                                               signature, 1);
 821                                 } else {
 822                                         DEBUG14(printk("scsi(%ld): Login IOCB "
 823                                             "-- unable to abort outstanding "
 824                                             "Adisc [%x/%02x%02x%02x].\n",
 825                                             ha->host_no, remote_fcport->loop_id,
 826                                             exist_fcport->d_id.b.domain,
 827                                             exist_fcport->d_id.b.area,
 828                                             exist_fcport->d_id.b.al_pa));
 829                                 }
 830                         }
 831
 832                         /*
 833                          * If the existing fcport is waiting to send an ADISC
 834                          * or LOGIN, then reuse remote fcport (RSCN) to
 835                          * continue waiting.
 836                          */
 837                         reuse = 0;
 838                         remote_loopid = remote_fcport->loop_id;
 839                         remote_did.b24 = remote_fcport->d_id.b24;
 840                         if (exist_fcport->iodesc_idx_sent ==
 841                             IODESC_ADISC_NEEDED ||
 842                             exist_fcport->iodesc_idx_sent ==
 843                             IODESC_LOGIN_NEEDED) {
 844                                 DEBUG14(printk("scsi(%ld): Login IOCB -- "
 845                                     "existing fcport [%x/%02x%02x%02x] "
 846                                     "waiting for IO descriptor, reuse RSCN "
 847                                     "fcport.\n", ha->host_no,
 848                                     exist_fcport->loop_id,
 849                                     exist_fcport->d_id.b.domain,
 850                                     exist_fcport->d_id.b.area,
 851                                     exist_fcport->d_id.b.al_pa));
 852
 853                                 reuse++;
 854                                 remote_fcport->iodesc_idx_sent =
 855                                     exist_fcport->iodesc_idx_sent;
 856                                 exist_fcport->iodesc_idx_sent =
 857                                     IODESC_INVALID_INDEX;
 858                                 remote_fcport->loop_id = exist_fcport->loop_id;
 859                                 remote_fcport->d_id.b24 =
 860                                     exist_fcport->d_id.b24;
 861                         }
 862
 863                         /* Logout the old loopid. */
 864                         if (!reuse &&
 865                             exist_fcport->loop_id != remote_fcport->loop_id &&
 866                             exist_fcport->loop_id != FC_NO_LOOP_ID) {
 867                                 login_iodesc = qla2x00_alloc_iodesc(ha);
 868                                 if (login_iodesc) {
 869                                         DEBUG14(printk("scsi(%ld): Login IOCB "
 870                                             "-- issuing logout to free old "
 871                                             "loop id [%x/%02x%02x%02x].\n",
 872                                             ha->host_no, exist_fcport->loop_id,
 873                                             exist_fcport->d_id.b.domain,
 874                                             exist_fcport->d_id.b.area,
 875                                             exist_fcport->d_id.b.al_pa));
 876
 877                                         login_iodesc->cb_idx =
 878                                             LOGOUT_PORT_IOCB_CB;
 879                                         login_iodesc->d_id.b24 =
 880                                             exist_fcport->d_id.b24;
 881                                         login_iodesc->remote_fcport =
 882                                             exist_fcport;
 883                                         exist_fcport->iodesc_idx_sent =
 884                                             login_iodesc->idx;
 885                                         qla2x00_send_logout_iocb(ha,
 886                                             login_iodesc, 1);
 887                                 } else {
 888                                         /* Ran out of IO descriptiors. */
 889                                         DEBUG14(printk("scsi(%ld): Login IOCB "
 890                                             "-- unable to logout to free old "
 891                                             "loop id [%x/%02x%02x%02x].\n",
 892                                             ha->host_no, exist_fcport->loop_id,
 893                                             exist_fcport->d_id.b.domain,
 894                                             exist_fcport->d_id.b.area,
 895                                             exist_fcport->d_id.b.al_pa));
 896
 897                                         exist_fcport->iodesc_idx_sent =
 898                                             IODESC_INVALID_INDEX;
 899                                 }
 900
 901                         }
 902
 903                         /* Update existing fcport with remote fcport info. */
 904                         DEBUG14(printk("scsi(%ld): Login IOCB -- marking "
 905                             "existing fcport [%x/%02x%02x%02x] online.\n",
 906                             ha->host_no, remote_loopid, remote_did.b.domain,
 907                             remote_did.b.area, remote_did.b.al_pa));
 908
 909                         memcpy(exist_fcport->node_name,
 910                             remote_fcport->node_name, WWN_SIZE);
 911                         exist_fcport->loop_id = remote_loopid;
 912                         exist_fcport->d_id.b24 = remote_did.b24;
 913                         qla2x00_update_login_fcport(ha, mbxstat, exist_fcport);
 914
 915                         /* Finally, free the remote (RSCN) fcport. */
 916                         if (!reuse) {
 917                                 DEBUG14(printk("scsi(%ld): Login IOCB -- "
 918                                     "Freeing RSCN fcport %p "
 919                                     "[%x/%02x%02x%02x].\n", ha->host_no,
 920                                     remote_fcport, remote_fcport->loop_id,
 921                                     remote_fcport->d_id.b.domain,
 922                                     remote_fcport->d_id.b.area,
 923                                     remote_fcport->d_id.b.al_pa));
 924
 925                                 list_del(&remote_fcport->list);
 926                                 kfree(remote_fcport);
 927                         }
 928
 929                         return (QLA_SUCCESS);
 930                 }
 931
 932                 /*
 933                  * A new device has been added, move the RSCN fcport to our
 934                  * fcports list.
 935                  */
 936                 DEBUG14(printk("scsi(%ld): Login IOCB -- adding RSCN fcport "
 937                     "[%x/%02x%02x%02x] to fcports list.\n", ha->host_no,
 938                     remote_fcport->loop_id, remote_fcport->d_id.b.domain,
 939                     remote_fcport->d_id.b.area, remote_fcport->d_id.b.al_pa));
 940
 941                 list_del(&remote_fcport->list);
 942                 remote_fcport->flags = (FCF_RLC_SUPPORT | FCF_RESCAN_NEEDED);
 943                 qla2x00_update_login_fcport(ha, mbxstat, remote_fcport);
 944                 list_add_tail(&remote_fcport->list, &ha->fcports);
 945                 set_bit(FCPORT_RESCAN_NEEDED, &ha->dpc_flags);
 946         } else {
 947                 /* Handle login failure. */
 948                 if (remote_fcport->login_retry != 0) {
 949                         if (mb[0] == MBS_LOOP_ID_USED) {
 950                                 inuse_did.b.domain = LSB(mb[1]);
 951                                 inuse_did.b.area = MSB(mb[2]);
 952                                 inuse_did.b.al_pa = LSB(mb[2]);
 953
 954                                 DEBUG14(printk("scsi(%ld): Login IOCB -- loop "
 955                                     "id [%x] used by port id [%02x%02x%02x].\n",
 956                                     ha->host_no, remote_fcport->loop_id,
 957                                     inuse_did.b.domain, inuse_did.b.area,
 958                                     inuse_did.b.al_pa));
 959
 960                                 if (remote_fcport->d_id.b24 ==
 961                                     INVALID_PORT_ID) {
 962                                         /*
 963                                          * Invalid port id means we are trying
 964                                          * to login to a remote port with just
 965                                          * a loop id without knowing about the
 966                                          * port id.  Copy the port id and try
 967                                          * again.
 968                                          */
 969                                         remote_fcport->d_id.b24 = inuse_did.b24;
 970                                         iodesc->d_id.b24 = inuse_did.b24;
 971                                 } else {
 972                                         remote_fcport->loop_id++;
 973                                         rval = qla2x00_find_new_loop_id(ha,
 974                                             remote_fcport);
 975                                         if (rval == QLA_FUNCTION_FAILED) {
 976                                                 /* No more loop ids. */
 977                                                 return (QLA_SUCCESS);
 978                                         }
 979                                 }
 980                         } else if (mb[0] == MBS_PORT_ID_USED) {
 981                                 /*
 982                                  * Device has another loop ID.  The firmware
 983                                  * group recommends the driver perform an
 984                                  * implicit login with the specified ID.
 985                                  */
 986                                 DEBUG14(printk("scsi(%ld): Login IOCB -- port "
 987                                     "id [%02x%02x%02x] already assigned to "
 988                                     "loop id [%x].\n", ha->host_no,
 989                                     iodesc->d_id.b.domain, iodesc->d_id.b.area,
 990                                     iodesc->d_id.b.al_pa, mb[1]));
 991
 992                                 remote_fcport->loop_id = mb[1];
 993
 994                         } else {
 995                                 /* Unable to perform login, try again. */
 996                                 DEBUG14(printk("scsi(%ld): Login IOCB -- "
 997                                     "failed login [%x/%02x%02x%02x], status=%x "
 998                                     "mb0=%x mb1=%x mb2=%x mb6=%x mb7=%x.\n",
 999                                     ha->host_no, remote_fcport->loop_id,
1000                                     iodesc->d_id.b.domain, iodesc->d_id.b.area,
1001                                     iodesc->d_id.b.al_pa, status, mb[0], mb[1],
1002                                     mb[2], mb[6], mb[7]));
1003                         }
1004
1005                         /* Reissue Login with the same IO descriptor. */
1006                         iodesc->signature =
1007                             qla2x00_iodesc_to_handle(iodesc);
1008                         iodesc->cb_idx = LOGIN_PORT_IOCB_CB;
1009                         iodesc->d_id.b24 = remote_fcport->d_id.b24;
1010                         remote_fcport->iodesc_idx_sent = iodesc->idx;
1011                         remote_fcport->login_retry--;
1012
1013                         DEBUG14(printk("scsi(%ld): Login IOCB -- retrying "
1014                             "login to [%x/%02x%02x%02x] (%d).\n", ha->host_no,
1015                             remote_fcport->loop_id,
1016                             remote_fcport->d_id.b.domain,
1017                             remote_fcport->d_id.b.area,
1018                             remote_fcport->d_id.b.al_pa,
1019                             remote_fcport->login_retry));
1020
1021                         qla2x00_send_login_iocb(ha, iodesc,
1022                             &remote_fcport->d_id, 1);
1023
1024                         return (QLA_FUNCTION_FAILED);
1025                 } else {
1026                         /* No more logins, mark device dead. */
1027                         DEBUG14(printk("scsi(%ld): Login IOCB -- failed "
1028                             "login [%x/%02x%02x%02x] after retries, status=%x "
1029                             "mb0=%x mb1=%x mb2=%x mb6=%x mb7=%x.\n",
1030                             ha->host_no, remote_fcport->loop_id,
1031                             iodesc->d_id.b.domain, iodesc->d_id.b.area,
1032                             iodesc->d_id.b.al_pa, status, mb[0], mb[1],
1033                             mb[2], mb[6], mb[7]));
1034
1035                         atomic_set(&remote_fcport->state, FCS_DEVICE_DEAD);
1036                         if (remote_fcport->port_type == FCT_RSCN) {
1037                                 DEBUG14(printk("scsi(%ld): Login IOCB -- "
1038                                     "Freeing dead RSCN fcport %p "
1039                                     "[%x/%02x%02x%02x].\n", ha->host_no,
1040                                     remote_fcport, remote_fcport->loop_id,
1041                                     remote_fcport->d_id.b.domain,
1042                                     remote_fcport->d_id.b.area,
1043                                     remote_fcport->d_id.b.al_pa));
1044
1045                                 list_del(&remote_fcport->list);
1046                                 kfree(remote_fcport);
1047                         }
1048                 }
1049         }
1050
1051         return (QLA_SUCCESS);
1052 }
1053
1054
1055 /**
1056  * IO descriptor processing routines.
1057  **/
1058
1059 /**
1060  * qla2x00_alloc_rscn_fcport() - Allocate an RSCN type fcport.
1061  * @ha: HA context
1062  * @flags: allocation flags
1063  *
1064  * Returns a pointer to the allocated RSCN fcport, or NULL, if none available.
1065  */
1066 fc_port_t *
1067 qla2x00_alloc_rscn_fcport(scsi_qla_host_t *ha, int flags)
1068 {
1069         fc_port_t *fcport;
1070
1071         fcport = qla2x00_alloc_fcport(ha, flags);
1072         if (fcport == NULL)
1073                 return (fcport);
1074
1075         /* Setup RSCN fcport structure. */
1076         fcport->port_type = FCT_RSCN;
1077
1078         return (fcport);
1079 }
1080
1081 /**
1082  * qla2x00_handle_port_rscn() - Handle port RSCN.
1083  * @ha: HA context
1084  * @rscn_entry: RSCN entry
1085  * @fcport: fcport entry to updated
1086  *
1087  * Returns QLA_SUCCESS if the port RSCN was handled.
1088  */
1089 int
1090 qla2x00_handle_port_rscn(scsi_qla_host_t *ha, uint32_t rscn_entry,
1091     fc_port_t *known_fcport, int ha_locked)
1092 {
1093         int     rval;
1094         port_id_t rscn_pid;
1095         fc_port_t *fcport, *remote_fcport, *rscn_fcport;
1096         struct io_descriptor *iodesc;
1097
1098         remote_fcport = NULL;
1099         rscn_fcport = NULL;
1100
1101         /* Prepare port id based on incoming entries. */
1102         if (known_fcport) {
1103                 rscn_pid.b24 = known_fcport->d_id.b24;
1104                 remote_fcport = known_fcport;
1105
1106                 DEBUG14(printk("scsi(%ld): Handle RSCN -- process RSCN for "
1107                     "fcport [%02x%02x%02x].\n", ha->host_no,
1108                     remote_fcport->d_id.b.domain, remote_fcport->d_id.b.area,
1109                     remote_fcport->d_id.b.al_pa));
1110         } else {
1111                 rscn_pid.b.domain = LSB(MSW(rscn_entry));
1112                 rscn_pid.b.area = MSB(LSW(rscn_entry));
1113                 rscn_pid.b.al_pa = LSB(LSW(rscn_entry));
1114
1115                 DEBUG14(printk("scsi(%ld): Handle RSCN -- process RSCN for "
1116                     "port id [%02x%02x%02x].\n", ha->host_no,
1117                     rscn_pid.b.domain, rscn_pid.b.area, rscn_pid.b.al_pa));
1118
1119                 /*
1120                  * Search fcport lists for a known entry at the specified port
1121                  * ID.
1122                  */
1123                 list_for_each_entry(fcport, &ha->fcports, list) {
1124                     if (rscn_pid.b24 == fcport->d_id.b24) {
1125                             remote_fcport = fcport;
1126                             break;
1127                     }
1128                 }
1129                 list_for_each_entry(fcport, &ha->rscn_fcports, list) {
1130                     if (rscn_pid.b24 == fcport->d_id.b24) {
1131                             rscn_fcport = fcport;
1132                             break;
1133                     }
1134                 }
1135                 if (remote_fcport == NULL)
1136                     remote_fcport = rscn_fcport;
1137         }
1138
1139         /*
1140          * If the port is already in our fcport list and online, send an ADISC
1141          * to see if it's still alive.  Issue login if a new fcport or the known
1142          * fcport is currently offline.
1143          */
1144         if (remote_fcport) {
1145                 /*
1146                  * No need to send request if the remote fcport is currently
1147                  * waiting for an available io descriptor.
1148                  */
1149                 if (known_fcport == NULL &&
1150                     (remote_fcport->iodesc_idx_sent == IODESC_ADISC_NEEDED ||
1151                     remote_fcport->iodesc_idx_sent == IODESC_LOGIN_NEEDED)) {
1152                         /*
1153                          * If previous waiting io descriptor is an ADISC, then
1154                          * the new RSCN may come from a new remote fcport being
1155                          * plugged into the same location.
1156                          */
1157                         if (remote_fcport->port_type == FCT_RSCN) {
1158                             remote_fcport->iodesc_idx_sent =
1159                                 IODESC_LOGIN_NEEDED;
1160                         } else if (remote_fcport->iodesc_idx_sent ==
1161                             IODESC_ADISC_NEEDED) {
1162                                 fc_port_t *new_fcport;
1163
1164                                 remote_fcport->iodesc_idx_sent =
1165                                     IODESC_INVALID_INDEX;
1166
1167                                 /* Create new fcport for later login. */
1168                                 new_fcport = qla2x00_alloc_rscn_fcport(ha,
1169                                     ha_locked ? GFP_ATOMIC: GFP_KERNEL);
1170                                 if (new_fcport) {
1171                                         DEBUG14(printk("scsi(%ld): Handle RSCN "
1172                                             "-- creating RSCN fcport %p for "
1173                                             "future login.\n", ha->host_no,
1174                                             new_fcport));
1175
1176                                         new_fcport->d_id.b24 =
1177                                             remote_fcport->d_id.b24;
1178                                         new_fcport->iodesc_idx_sent =
1179                                             IODESC_LOGIN_NEEDED;
1180
1181                                         list_add_tail(&new_fcport->list,
1182                                             &ha->rscn_fcports);
1183                                         set_bit(IODESC_PROCESS_NEEDED,
1184                                             &ha->dpc_flags);
1185                                 } else {
1186                                         DEBUG14(printk("scsi(%ld): Handle RSCN "
1187                                             "-- unable to allocate RSCN fcport "
1188                                             "for future login.\n",
1189                                             ha->host_no));
1190                                 }
1191                         }
1192                         return (QLA_SUCCESS);
1193                 }
1194
1195                 /* Send ADISC if the fcport is online */
1196                 if (atomic_read(&remote_fcport->state) == FCS_ONLINE ||
1197                     remote_fcport->iodesc_idx_sent == IODESC_ADISC_NEEDED) {
1198
1199                         atomic_set(&remote_fcport->state, FCS_DEVICE_LOST);
1200
1201                         iodesc = qla2x00_alloc_iodesc(ha);
1202                         if (iodesc == NULL) {
1203                                 /* Mark fcport for later adisc processing */
1204                                 DEBUG14(printk("scsi(%ld): Handle RSCN -- not "
1205                                     "enough IO descriptors for Adisc, flag "
1206                                     "for later processing.\n", ha->host_no));
1207
1208                                 remote_fcport->iodesc_idx_sent =
1209                                     IODESC_ADISC_NEEDED;
1210                                 set_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags);
1211
1212                                 return (QLA_SUCCESS);
1213                         }
1214
1215                         iodesc->cb_idx = ADISC_PORT_IOCB_CB;
1216                         iodesc->d_id.b24 = rscn_pid.b24;
1217                         iodesc->remote_fcport = remote_fcport;
1218                         remote_fcport->iodesc_idx_sent = iodesc->idx;
1219                         qla2x00_send_adisc_iocb(ha, iodesc, ha_locked);
1220
1221                         return (QLA_SUCCESS);
1222                 } else if (remote_fcport->iodesc_idx_sent <
1223                     MAX_IO_DESCRIPTORS &&
1224                     ha->io_descriptors[remote_fcport->iodesc_idx_sent].cb_idx ==
1225                     ADISC_PORT_IOCB_CB) {
1226                         /*
1227                          * Receiving another RSCN while an ADISC is pending,
1228                          * abort the IOCB.  Use the same descriptor for the
1229                          * abort.
1230                          */
1231                         uint32_t handle_to_abort;
1232
1233                         iodesc = &ha->io_descriptors[
1234                                 remote_fcport->iodesc_idx_sent];
1235                         qla2x00_remove_iodesc_timer(iodesc);
1236                         handle_to_abort = iodesc->signature;
1237                         iodesc->signature = qla2x00_iodesc_to_handle(iodesc);
1238                         iodesc->cb_idx = ABORT_IOCB_CB;
1239                         iodesc->d_id.b24 = remote_fcport->d_id.b24;
1240                         iodesc->remote_fcport = remote_fcport;
1241                         remote_fcport->iodesc_idx_sent = iodesc->idx;
1242
1243                         DEBUG14(printk("scsi(%ld): Handle RSCN -- issuing "
1244                             "abort to outstanding Adisc [%x/%02x%02x%02x].\n",
1245                             ha->host_no, remote_fcport->loop_id,
1246                             iodesc->d_id.b.domain, iodesc->d_id.b.area,
1247                             iodesc->d_id.b.al_pa));
1248
1249                         qla2x00_send_abort_iocb(ha, iodesc, handle_to_abort,
1250                             ha_locked);
1251                 }
1252         }
1253
1254         /* We need to login to the remote port, find it. */
1255         if (known_fcport) {
1256                 remote_fcport = known_fcport;
1257         } else if (rscn_fcport && rscn_fcport->d_id.b24 != INVALID_PORT_ID &&
1258             rscn_fcport->iodesc_idx_sent < MAX_IO_DESCRIPTORS &&
1259             ha->io_descriptors[rscn_fcport->iodesc_idx_sent].cb_idx ==
1260             LOGIN_PORT_IOCB_CB) {
1261                 /*
1262                  * Ignore duplicate RSCN on fcport which has already
1263                  * initiated a login IOCB.
1264                  */
1265                 DEBUG14(printk("scsi(%ld): Handle RSCN -- ignoring, login "
1266                     "already sent to [%02x%02x%02x].\n", ha->host_no,
1267                     rscn_fcport->d_id.b.domain, rscn_fcport->d_id.b.area,
1268                     rscn_fcport->d_id.b.al_pa));
1269
1270                 return (QLA_SUCCESS);
1271         } else if (rscn_fcport && rscn_fcport->d_id.b24 != INVALID_PORT_ID &&
1272             rscn_fcport != remote_fcport) {
1273                 /* Reuse same rscn fcport. */
1274                 DEBUG14(printk("scsi(%ld): Handle RSCN -- reusing RSCN fcport "
1275                     "[%02x%02x%02x].\n", ha->host_no,
1276                     rscn_fcport->d_id.b.domain, rscn_fcport->d_id.b.area,
1277                     rscn_fcport->d_id.b.al_pa));
1278
1279                 remote_fcport = rscn_fcport;
1280         } else {
1281                 /* Create new fcport for later login. */
1282                 remote_fcport = qla2x00_alloc_rscn_fcport(ha,
1283                     ha_locked ? GFP_ATOMIC: GFP_KERNEL);
1284                 list_add_tail(&remote_fcport->list, &ha->rscn_fcports);
1285         }
1286         if (remote_fcport == NULL)
1287                 return (QLA_SUCCESS);
1288
1289         /* Prepare fcport for login. */
1290         atomic_set(&remote_fcport->state, FCS_DEVICE_LOST);
1291         remote_fcport->login_retry = 3; /* ha->login_retry_count; */
1292         remote_fcport->d_id.b24 = rscn_pid.b24;
1293
1294         iodesc = qla2x00_alloc_iodesc(ha);
1295         if (iodesc == NULL) {
1296                 /* Mark fcport for later adisc processing. */
1297                 DEBUG14(printk("scsi(%ld): Handle RSCN -- not enough IO "
1298                     "descriptors for Login, flag for later processing.\n",
1299                     ha->host_no));
1300
1301                 remote_fcport->iodesc_idx_sent = IODESC_LOGIN_NEEDED;
1302                 set_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags);
1303
1304                 return (QLA_SUCCESS);
1305         }
1306
1307         if (known_fcport == NULL || rscn_pid.b24 != INVALID_PORT_ID) {
1308                 remote_fcport->loop_id = ha->min_external_loopid;
1309
1310                 rval = qla2x00_find_new_loop_id(ha, remote_fcport);
1311                 if (rval == QLA_FUNCTION_FAILED) {
1312                         /* No more loop ids, failed. */
1313                         DEBUG14(printk("scsi(%ld): Handle RSCN -- no available "
1314                             "loop id to perform Login, failed.\n",
1315                             ha->host_no));
1316
1317                         return (rval);
1318                 }
1319         }
1320
1321         iodesc->cb_idx = LOGIN_PORT_IOCB_CB;
1322         iodesc->d_id.b24 = rscn_pid.b24;
1323         iodesc->remote_fcport = remote_fcport;
1324         remote_fcport->iodesc_idx_sent = iodesc->idx;
1325
1326         DEBUG14(printk("scsi(%ld): Handle RSCN -- attempting login to "
1327             "[%x/%02x%02x%02x].\n", ha->host_no, remote_fcport->loop_id,
1328             iodesc->d_id.b.domain, iodesc->d_id.b.area, iodesc->d_id.b.al_pa));
1329
1330         qla2x00_send_login_iocb(ha, iodesc, &rscn_pid, ha_locked);
1331
1332         return (QLA_SUCCESS);
1333 }
1334
1335 /**
1336  * qla2x00_process_iodesc() - Complete IO descriptor processing.
1337  * @ha: HA context
1338  * @mbxstat: Mailbox IOCB status
1339  */
1340 void
1341 qla2x00_process_iodesc(scsi_qla_host_t *ha, struct mbx_entry *mbxstat)
1342 {
1343         int rval;
1344         uint32_t signature;
1345         fc_port_t *fcport;
1346         struct io_descriptor *iodesc;
1347
1348         signature = mbxstat->handle;
1349
1350         DEBUG14(printk("scsi(%ld): Process IODesc -- processing %08x.\n",
1351             ha->host_no, signature));
1352
1353         /* Retrieve proper IO descriptor. */
1354         iodesc = qla2x00_handle_to_iodesc(ha, signature);
1355         if (iodesc == NULL) {
1356                 DEBUG14(printk("scsi(%ld): Process IODesc -- ignoring, "
1357                     "incorrect signature %08x.\n", ha->host_no, signature));
1358
1359                 return;
1360         }
1361
1362         /* Stop IO descriptor timer. */
1363         qla2x00_remove_iodesc_timer(iodesc);
1364
1365         /* Verify signature match. */
1366         if (iodesc->signature != signature) {
1367                 DEBUG14(printk("scsi(%ld): Process IODesc -- ignoring, "
1368                     "signature mismatch, sent %08x, received %08x.\n",
1369                     ha->host_no, iodesc->signature, signature));
1370
1371                 return;
1372         }
1373
1374         /* Go with IOCB callback. */
1375         rval = iocb_function_cb_list[iodesc->cb_idx](ha, iodesc, mbxstat);
1376         if (rval != QLA_SUCCESS) {
1377                 /* IO descriptor reused by callback. */
1378                 return;
1379         }
1380
1381         qla2x00_free_iodesc(iodesc);
1382
1383         if (test_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags)) {
1384                 /* Scan our fcports list for any RSCN requests. */
1385                 list_for_each_entry(fcport, &ha->fcports, list) {
1386                         if (fcport->iodesc_idx_sent == IODESC_ADISC_NEEDED ||
1387                             fcport->iodesc_idx_sent == IODESC_LOGIN_NEEDED) {
1388                                 qla2x00_handle_port_rscn(ha, 0, fcport, 1);
1389                                 return;
1390                         }
1391                 }
1392
1393                 /* Scan our RSCN fcports list for any RSCN requests. */
1394                 list_for_each_entry(fcport, &ha->rscn_fcports, list) {
1395                         if (fcport->iodesc_idx_sent == IODESC_ADISC_NEEDED ||
1396                             fcport->iodesc_idx_sent == IODESC_LOGIN_NEEDED) {
1397                                 qla2x00_handle_port_rscn(ha, 0, fcport, 1);
1398                                 return;
1399                         }
1400                 }
1401         }
1402         clear_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags);
1403 }
1404
1405 /**
1406  * qla2x00_cancel_io_descriptors() - Cancel all outstanding io descriptors.
1407  * @ha: HA context
1408  *
1409  * This routine will also delete any RSCN entries related to the outstanding
1410  * IO descriptors.
1411  */
1412 void
1413 qla2x00_cancel_io_descriptors(scsi_qla_host_t *ha)
1414 {
1415         fc_port_t *fcport, *fcptemp;
1416
1417         clear_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags);
1418
1419         /* Abort all IO descriptors. */
1420         qla2x00_init_io_descriptors(ha);
1421
1422         /* Reset all pending IO descriptors in fcports list. */
1423         list_for_each_entry(fcport, &ha->fcports, list) {
1424                 fcport->iodesc_idx_sent = IODESC_INVALID_INDEX;
1425         }
1426
1427         /* Reset all pending IO descriptors in rscn fcports list. */
1428         list_for_each_entry_safe(fcport, fcptemp, &ha->rscn_fcports, list) {
1429                 DEBUG14(printk("scsi(%ld): Cancel IOs -- Freeing RSCN fcport "
1430                     "%p [%x/%02x%02x%02x].\n", ha->host_no, fcport,
1431                     fcport->loop_id, fcport->d_id.b.domain, fcport->d_id.b.area,
1432                     fcport->d_id.b.al_pa));
1433
1434                 list_del(&fcport->list);
1435                 kfree(fcport);
1436         }
1437 }