drivers/scsi/bfa/scn.c

   1 /*
   2  * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
   3  * All rights reserved
   4  * www.brocade.com
   5  *
   6  * Linux driver for Brocade Fibre Channel Host Bus Adapter.
   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 (GPL) Version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <bfa.h>
  19 #include <bfa_svc.h>
  20 #include "fcs_lport.h"
  21 #include "fcs_rport.h"
  22 #include "fcs_ms.h"
  23 #include "fcs_trcmod.h"
  24 #include "fcs_fcxp.h"
  25 #include "fcs.h"
  26 #include "lport_priv.h"
  27
  28 BFA_TRC_FILE(FCS, SCN);
  29
  30 #define FC_QOS_RSCN_EVENT               0x0c
  31 #define FC_FABRIC_NAME_RSCN_EVENT       0x0d
  32
  33 /*
  34  * forward declarations
  35  */
  36 static void     bfa_fcs_port_scn_send_scr(void *scn_cbarg,
  37                                           struct bfa_fcxp_s *fcxp_alloced);
  38 static void     bfa_fcs_port_scn_scr_response(void *fcsarg,
  39                                               struct bfa_fcxp_s *fcxp,
  40                                               void *cbarg,
  41                                               bfa_status_t req_status,
  42                                               u32 rsp_len,
  43                                               u32 resid_len,
  44                                               struct fchs_s *rsp_fchs);
  45 static void     bfa_fcs_port_scn_send_ls_acc(struct bfa_fcs_port_s *port,
  46                                              struct fchs_s *rx_fchs);
  47 static void     bfa_fcs_port_scn_timeout(void *arg);
  48
  49 /**
  50  *  fcs_scm_sm FCS SCN state machine
  51  */
  52
  53 /**
  54  * VPort SCN State Machine events
  55  */
  56 enum port_scn_event {
  57         SCNSM_EVENT_PORT_ONLINE = 1,
  58         SCNSM_EVENT_PORT_OFFLINE = 2,
  59         SCNSM_EVENT_RSP_OK = 3,
  60         SCNSM_EVENT_RSP_ERROR = 4,
  61         SCNSM_EVENT_TIMEOUT = 5,
  62         SCNSM_EVENT_SCR_SENT = 6,
  63 };
  64
  65 static void     bfa_fcs_port_scn_sm_offline(struct bfa_fcs_port_scn_s *scn,
  66                                             enum port_scn_event event);
  67 static void     bfa_fcs_port_scn_sm_sending_scr(struct bfa_fcs_port_scn_s *scn,
  68                                                 enum port_scn_event event);
  69 static void     bfa_fcs_port_scn_sm_scr(struct bfa_fcs_port_scn_s *scn,
  70                                         enum port_scn_event event);
  71 static void     bfa_fcs_port_scn_sm_scr_retry(struct bfa_fcs_port_scn_s *scn,
  72                                               enum port_scn_event event);
  73 static void     bfa_fcs_port_scn_sm_online(struct bfa_fcs_port_scn_s *scn,
  74                                            enum port_scn_event event);
  75
  76 /**
  77  *              Starting state - awaiting link up.
  78  */
  79 static void
  80 bfa_fcs_port_scn_sm_offline(struct bfa_fcs_port_scn_s *scn,
  81                             enum port_scn_event event)
  82 {
  83         switch (event) {
  84         case SCNSM_EVENT_PORT_ONLINE:
  85                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_sending_scr);
  86                 bfa_fcs_port_scn_send_scr(scn, NULL);
  87                 break;
  88
  89         case SCNSM_EVENT_PORT_OFFLINE:
  90                 break;
  91
  92         default:
  93                 bfa_sm_fault(scn->port->fcs, event);
  94         }
  95 }
  96
  97 static void
  98 bfa_fcs_port_scn_sm_sending_scr(struct bfa_fcs_port_scn_s *scn,
  99                                 enum port_scn_event event)
 100 {
 101         switch (event) {
 102         case SCNSM_EVENT_SCR_SENT:
 103                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_scr);
 104                 break;
 105
 106         case SCNSM_EVENT_PORT_OFFLINE:
 107                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_offline);
 108                 bfa_fcxp_walloc_cancel(scn->port->fcs->bfa, &scn->fcxp_wqe);
 109                 break;
 110
 111         default:
 112                 bfa_sm_fault(scn->port->fcs, event);
 113         }
 114 }
 115
 116 static void
 117 bfa_fcs_port_scn_sm_scr(struct bfa_fcs_port_scn_s *scn,
 118                         enum port_scn_event event)
 119 {
 120         struct bfa_fcs_port_s *port = scn->port;
 121
 122         switch (event) {
 123         case SCNSM_EVENT_RSP_OK:
 124                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_online);
 125                 break;
 126
 127         case SCNSM_EVENT_RSP_ERROR:
 128                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_scr_retry);
 129                 bfa_timer_start(port->fcs->bfa, &scn->timer,
 130                                 bfa_fcs_port_scn_timeout, scn,
 131                                 BFA_FCS_RETRY_TIMEOUT);
 132                 break;
 133
 134         case SCNSM_EVENT_PORT_OFFLINE:
 135                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_offline);
 136                 bfa_fcxp_discard(scn->fcxp);
 137                 break;
 138
 139         default:
 140                 bfa_sm_fault(scn->port->fcs, event);
 141         }
 142 }
 143
 144 static void
 145 bfa_fcs_port_scn_sm_scr_retry(struct bfa_fcs_port_scn_s *scn,
 146                               enum port_scn_event event)
 147 {
 148         switch (event) {
 149         case SCNSM_EVENT_TIMEOUT:
 150                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_sending_scr);
 151                 bfa_fcs_port_scn_send_scr(scn, NULL);
 152                 break;
 153
 154         case SCNSM_EVENT_PORT_OFFLINE:
 155                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_offline);
 156                 bfa_timer_stop(&scn->timer);
 157                 break;
 158
 159         default:
 160                 bfa_sm_fault(scn->port->fcs, event);
 161         }
 162 }
 163
 164 static void
 165 bfa_fcs_port_scn_sm_online(struct bfa_fcs_port_scn_s *scn,
 166                            enum port_scn_event event)
 167 {
 168         switch (event) {
 169         case SCNSM_EVENT_PORT_OFFLINE:
 170                 bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_offline);
 171                 break;
 172
 173         default:
 174                 bfa_sm_fault(scn->port->fcs, event);
 175         }
 176 }
 177
 178
 179
 180 /**
 181  *  fcs_scn_private FCS SCN private functions
 182  */
 183
 184 /**
 185  * This routine will be called to send a SCR command.
 186  */
 187 static void
 188 bfa_fcs_port_scn_send_scr(void *scn_cbarg, struct bfa_fcxp_s *fcxp_alloced)
 189 {
 190         struct bfa_fcs_port_scn_s *scn = scn_cbarg;
 191         struct bfa_fcs_port_s *port = scn->port;
 192         struct fchs_s          fchs;
 193         int             len;
 194         struct bfa_fcxp_s *fcxp;
 195
 196         bfa_trc(port->fcs, port->pid);
 197         bfa_trc(port->fcs, port->port_cfg.pwwn);
 198
 199         fcxp = fcxp_alloced ? fcxp_alloced : bfa_fcs_fcxp_alloc(port->fcs);
 200         if (!fcxp) {
 201                 bfa_fcxp_alloc_wait(port->fcs->bfa, &scn->fcxp_wqe,
 202                                     bfa_fcs_port_scn_send_scr, scn);
 203                 return;
 204         }
 205         scn->fcxp = fcxp;
 206
 207         /*
 208          * Handle VU registrations for Base port only
 209          */
 210         if ((!port->vport) && bfa_ioc_get_fcmode(&port->fcs->bfa->ioc)) {
 211                 len = fc_scr_build(&fchs, bfa_fcxp_get_reqbuf(fcxp),
 212                                    bfa_lps_is_brcd_fabric(port->fabric->lps),
 213                                    port->pid, 0);
 214         } else {
 215                 len = fc_scr_build(&fchs, bfa_fcxp_get_reqbuf(fcxp), BFA_FALSE,
 216                                    port->pid, 0);
 217         }
 218
 219         bfa_fcxp_send(fcxp, NULL, port->fabric->vf_id, port->lp_tag, BFA_FALSE,
 220                       FC_CLASS_3, len, &fchs, bfa_fcs_port_scn_scr_response,
 221                       (void *)scn, FC_MAX_PDUSZ, FC_RA_TOV);
 222
 223         bfa_sm_send_event(scn, SCNSM_EVENT_SCR_SENT);
 224 }
 225
 226 static void
 227 bfa_fcs_port_scn_scr_response(void *fcsarg, struct bfa_fcxp_s *fcxp,
 228                               void *cbarg, bfa_status_t req_status,
 229                               u32 rsp_len, u32 resid_len,
 230                               struct fchs_s *rsp_fchs)
 231 {
 232         struct bfa_fcs_port_scn_s *scn = (struct bfa_fcs_port_scn_s *)cbarg;
 233         struct bfa_fcs_port_s *port = scn->port;
 234         struct fc_els_cmd_s   *els_cmd;
 235         struct fc_ls_rjt_s    *ls_rjt;
 236
 237         bfa_trc(port->fcs, port->port_cfg.pwwn);
 238
 239         /*
 240          * Sanity Checks
 241          */
 242         if (req_status != BFA_STATUS_OK) {
 243                 bfa_trc(port->fcs, req_status);
 244                 bfa_sm_send_event(scn, SCNSM_EVENT_RSP_ERROR);
 245                 return;
 246         }
 247
 248         els_cmd = (struct fc_els_cmd_s *) BFA_FCXP_RSP_PLD(fcxp);
 249
 250         switch (els_cmd->els_code) {
 251
 252         case FC_ELS_ACC:
 253                 bfa_sm_send_event(scn, SCNSM_EVENT_RSP_OK);
 254                 break;
 255
 256         case FC_ELS_LS_RJT:
 257
 258                 ls_rjt = (struct fc_ls_rjt_s *) BFA_FCXP_RSP_PLD(fcxp);
 259
 260                 bfa_trc(port->fcs, ls_rjt->reason_code);
 261                 bfa_trc(port->fcs, ls_rjt->reason_code_expl);
 262
 263                 bfa_sm_send_event(scn, SCNSM_EVENT_RSP_ERROR);
 264                 break;
 265
 266         default:
 267                 bfa_sm_send_event(scn, SCNSM_EVENT_RSP_ERROR);
 268         }
 269 }
 270
 271 /*
 272  * Send a LS Accept
 273  */
 274 static void
 275 bfa_fcs_port_scn_send_ls_acc(struct bfa_fcs_port_s *port,
 276                         struct fchs_s *rx_fchs)
 277 {
 278         struct fchs_s          fchs;
 279         struct bfa_fcxp_s *fcxp;
 280         struct bfa_rport_s *bfa_rport = NULL;
 281         int             len;
 282
 283         bfa_trc(port->fcs, rx_fchs->s_id);
 284
 285         fcxp = bfa_fcs_fcxp_alloc(port->fcs);
 286         if (!fcxp)
 287                 return;
 288
 289         len = fc_ls_acc_build(&fchs, bfa_fcxp_get_reqbuf(fcxp), rx_fchs->s_id,
 290                               bfa_fcs_port_get_fcid(port), rx_fchs->ox_id);
 291
 292         bfa_fcxp_send(fcxp, bfa_rport, port->fabric->vf_id, port->lp_tag,
 293                       BFA_FALSE, FC_CLASS_3, len, &fchs, NULL, NULL,
 294                       FC_MAX_PDUSZ, 0);
 295 }
 296
 297 /**
 298  *     This routine will be called by bfa_timer on timer timeouts.
 299  *
 300  *      param[in]       vport                   - pointer to bfa_fcs_port_t.
 301  *      param[out]      vport_status    - pointer to return vport status in
 302  *
 303  *      return
 304  *              void
 305  *
 306 *       Special Considerations:
 307  *
 308  *      note
 309  */
 310 static void
 311 bfa_fcs_port_scn_timeout(void *arg)
 312 {
 313         struct bfa_fcs_port_scn_s *scn = (struct bfa_fcs_port_scn_s *)arg;
 314
 315         bfa_sm_send_event(scn, SCNSM_EVENT_TIMEOUT);
 316 }
 317
 318
 319
 320 /**
 321  *  fcs_scn_public FCS state change notification public interfaces
 322  */
 323
 324 /*
 325  * Functions called by port/fab
 326  */
 327 void
 328 bfa_fcs_port_scn_init(struct bfa_fcs_port_s *port)
 329 {
 330         struct bfa_fcs_port_scn_s *scn = BFA_FCS_GET_SCN_FROM_PORT(port);
 331
 332         scn->port = port;
 333         bfa_sm_set_state(scn, bfa_fcs_port_scn_sm_offline);
 334 }
 335
 336 void
 337 bfa_fcs_port_scn_offline(struct bfa_fcs_port_s *port)
 338 {
 339         struct bfa_fcs_port_scn_s *scn = BFA_FCS_GET_SCN_FROM_PORT(port);
 340
 341         scn->port = port;
 342         bfa_sm_send_event(scn, SCNSM_EVENT_PORT_OFFLINE);
 343 }
 344
 345 void
 346 bfa_fcs_port_scn_online(struct bfa_fcs_port_s *port)
 347 {
 348         struct bfa_fcs_port_scn_s *scn = BFA_FCS_GET_SCN_FROM_PORT(port);
 349
 350         scn->port = port;
 351         bfa_sm_send_event(scn, SCNSM_EVENT_PORT_ONLINE);
 352 }
 353
 354 static void
 355 bfa_fcs_port_scn_portid_rscn(struct bfa_fcs_port_s *port, u32 rpid)
 356 {
 357         struct bfa_fcs_rport_s *rport;
 358
 359         bfa_trc(port->fcs, rpid);
 360
 361         /**
 362          * If this is an unknown device, then it just came online.
 363          * Otherwise let rport handle the RSCN event.
 364          */
 365         rport = bfa_fcs_port_get_rport_by_pid(port, rpid);
 366         if (rport == NULL) {
 367                 /*
 368                  * If min cfg mode is enabled, we donot need to
 369                  * discover any new rports.
 370                  */
 371                 if (!__fcs_min_cfg(port->fcs))
 372                         rport = bfa_fcs_rport_create(port, rpid);
 373         } else {
 374                 bfa_fcs_rport_scn(rport);
 375         }
 376 }
 377
 378 /**
 379  * rscn format based PID comparison
 380  */
 381 #define __fc_pid_match(__c0, __c1, __fmt)               \
 382         (((__fmt) == FC_RSCN_FORMAT_FABRIC) ||          \
 383          (((__fmt) == FC_RSCN_FORMAT_DOMAIN) &&         \
 384           ((__c0)[0] == (__c1)[0])) ||                  \
 385          (((__fmt) == FC_RSCN_FORMAT_AREA) &&           \
 386           ((__c0)[0] == (__c1)[0]) &&                   \
 387           ((__c0)[1] == (__c1)[1])))
 388
 389 static void
 390 bfa_fcs_port_scn_multiport_rscn(struct bfa_fcs_port_s *port,
 391                         enum fc_rscn_format format, u32 rscn_pid)
 392 {
 393         struct bfa_fcs_rport_s *rport;
 394         struct list_head *qe, *qe_next;
 395         u8        *c0, *c1;
 396
 397         bfa_trc(port->fcs, format);
 398         bfa_trc(port->fcs, rscn_pid);
 399
 400         c0 = (u8 *) &rscn_pid;
 401
 402         list_for_each_safe(qe, qe_next, &port->rport_q) {
 403                 rport = (struct bfa_fcs_rport_s *)qe;
 404                 c1 = (u8 *) &rport->pid;
 405                 if (__fc_pid_match(c0, c1, format))
 406                         bfa_fcs_rport_scn(rport);
 407         }
 408 }
 409
 410 void
 411 bfa_fcs_port_scn_process_rscn(struct bfa_fcs_port_s *port, struct fchs_s *fchs,
 412                               u32 len)
 413 {
 414         struct fc_rscn_pl_s   *rscn = (struct fc_rscn_pl_s *) (fchs + 1);
 415         int             num_entries;
 416         u32        rscn_pid;
 417         bfa_boolean_t   nsquery = BFA_FALSE;
 418         int             i = 0;
 419
 420         num_entries =
 421                 (bfa_os_ntohs(rscn->payldlen) -
 422                  sizeof(u32)) / sizeof(rscn->event[0]);
 423
 424         bfa_trc(port->fcs, num_entries);
 425
 426         port->stats.num_rscn++;
 427
 428         bfa_fcs_port_scn_send_ls_acc(port, fchs);
 429
 430         for (i = 0; i < num_entries; i++) {
 431                 rscn_pid = rscn->event[i].portid;
 432
 433                 bfa_trc(port->fcs, rscn->event[i].format);
 434                 bfa_trc(port->fcs, rscn_pid);
 435
 436                 switch (rscn->event[i].format) {
 437                 case FC_RSCN_FORMAT_PORTID:
 438                         if (rscn->event[i].qualifier == FC_QOS_RSCN_EVENT) {
 439                                 /*
 440                                  * Ignore this event. f/w would have processed
 441                                  * it
 442                                  */
 443                                 bfa_trc(port->fcs, rscn_pid);
 444                         } else {
 445                                 port->stats.num_portid_rscn++;
 446                                 bfa_fcs_port_scn_portid_rscn(port, rscn_pid);
 447                         }
 448                         break;
 449
 450                 case FC_RSCN_FORMAT_FABRIC:
 451                         if (rscn->event[i].qualifier ==
 452                             FC_FABRIC_NAME_RSCN_EVENT) {
 453                                 bfa_fcs_port_ms_fabric_rscn(port);
 454                                 break;
 455                         }
 456                         /*
 457                          * !!!!!!!!! Fall Through !!!!!!!!!!!!!
 458                          */
 459
 460                 case FC_RSCN_FORMAT_AREA:
 461                 case FC_RSCN_FORMAT_DOMAIN:
 462                         nsquery = BFA_TRUE;
 463                         bfa_fcs_port_scn_multiport_rscn(port,
 464                                                         rscn->event[i].format,
 465                                                         rscn_pid);
 466                         break;
 467
 468                 default:
 469                         bfa_assert(0);
 470                         nsquery = BFA_TRUE;
 471                 }
 472         }
 473
 474         /**
 475          * If any of area, domain or fabric RSCN is received, do a fresh discovery
 476          * to find new devices.
 477          */
 478         if (nsquery)
 479                 bfa_fcs_port_ns_query(port);
 480 }
 481
 482