kernel/drivers/scsi/fcoe/fcoe_ctlr.c

   1 /*
   2  * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright (c) 2009 Intel Corporation.  All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Maintained at www.Open-FCoE.org
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/list.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/timer.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/if_vlan.h>
  32 #include <linux/errno.h>
  33 #include <linux/bitops.h>
  34 #include <linux/slab.h>
  35 #include <net/rtnetlink.h>
  36
  37 #include <scsi/fc/fc_els.h>
  38 #include <scsi/fc/fc_fs.h>
  39 #include <scsi/fc/fc_fip.h>
  40 #include <scsi/fc/fc_encaps.h>
  41 #include <scsi/fc/fc_fcoe.h>
  42 #include <scsi/fc/fc_fcp.h>
  43
  44 #include <scsi/libfc.h>
  45 #include <scsi/libfcoe.h>
  46
  47 #include "libfcoe.h"
  48
  49 #define FCOE_CTLR_MIN_FKA       500             /* min keep alive (mS) */
  50 #define FCOE_CTLR_DEF_FKA       FIP_DEF_FKA     /* default keep alive (mS) */
  51
  52 static void fcoe_ctlr_timeout(unsigned long);
  53 static void fcoe_ctlr_timer_work(struct work_struct *);
  54 static void fcoe_ctlr_recv_work(struct work_struct *);
  55 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *);
  56
  57 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *);
  58 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *, struct sk_buff *);
  59 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *);
  60 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *, u32, u8 *);
  61
  62 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
  63 static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS;
  64 static u8 fcoe_all_vn2vn[ETH_ALEN] = FIP_ALL_VN2VN_MACS;
  65 static u8 fcoe_all_p2p[ETH_ALEN] = FIP_ALL_P2P_MACS;
  66
  67 static const char * const fcoe_ctlr_states[] = {
  68         [FIP_ST_DISABLED] =     "DISABLED",
  69         [FIP_ST_LINK_WAIT] =    "LINK_WAIT",
  70         [FIP_ST_AUTO] =         "AUTO",
  71         [FIP_ST_NON_FIP] =      "NON_FIP",
  72         [FIP_ST_ENABLED] =      "ENABLED",
  73         [FIP_ST_VNMP_START] =   "VNMP_START",
  74         [FIP_ST_VNMP_PROBE1] =  "VNMP_PROBE1",
  75         [FIP_ST_VNMP_PROBE2] =  "VNMP_PROBE2",
  76         [FIP_ST_VNMP_CLAIM] =   "VNMP_CLAIM",
  77         [FIP_ST_VNMP_UP] =      "VNMP_UP",
  78 };
  79
  80 static const char *fcoe_ctlr_state(enum fip_state state)
  81 {
  82         const char *cp = "unknown";
  83
  84         if (state < ARRAY_SIZE(fcoe_ctlr_states))
  85                 cp = fcoe_ctlr_states[state];
  86         if (!cp)
  87                 cp = "unknown";
  88         return cp;
  89 }
  90
  91 /**
  92  * fcoe_ctlr_set_state() - Set and do debug printing for the new FIP state.
  93  * @fip: The FCoE controller
  94  * @state: The new state
  95  */
  96 static void fcoe_ctlr_set_state(struct fcoe_ctlr *fip, enum fip_state state)
  97 {
  98         if (state == fip->state)
  99                 return;
 100         if (fip->lp)
 101                 LIBFCOE_FIP_DBG(fip, "state %s -> %s\n",
 102                         fcoe_ctlr_state(fip->state), fcoe_ctlr_state(state));
 103         fip->state = state;
 104 }
 105
 106 /**
 107  * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
 108  * @fcf: The FCF to check
 109  *
 110  * Return non-zero if FCF fcoe_size has been validated.
 111  */
 112 static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
 113 {
 114         return (fcf->flags & FIP_FL_SOL) != 0;
 115 }
 116
 117 /**
 118  * fcoe_ctlr_fcf_usable() - Check if a FCF is usable
 119  * @fcf: The FCF to check
 120  *
 121  * Return non-zero if the FCF is usable.
 122  */
 123 static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
 124 {
 125         u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
 126
 127         return (fcf->flags & flags) == flags;
 128 }
 129
 130 /**
 131  * fcoe_ctlr_map_dest() - Set flag and OUI for mapping destination addresses
 132  * @fip: The FCoE controller
 133  */
 134 static void fcoe_ctlr_map_dest(struct fcoe_ctlr *fip)
 135 {
 136         if (fip->mode == FIP_MODE_VN2VN)
 137                 hton24(fip->dest_addr, FIP_VN_FC_MAP);
 138         else
 139                 hton24(fip->dest_addr, FIP_DEF_FC_MAP);
 140         hton24(fip->dest_addr + 3, 0);
 141         fip->map_dest = 1;
 142 }
 143
 144 /**
 145  * fcoe_ctlr_init() - Initialize the FCoE Controller instance
 146  * @fip: The FCoE controller to initialize
 147  */
 148 void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_state mode)
 149 {
 150         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
 151         fip->mode = mode;
 152         INIT_LIST_HEAD(&fip->fcfs);
 153         mutex_init(&fip->ctlr_mutex);
 154         spin_lock_init(&fip->ctlr_lock);
 155         fip->flogi_oxid = FC_XID_UNKNOWN;
 156         setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
 157         INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
 158         INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
 159         skb_queue_head_init(&fip->fip_recv_list);
 160 }
 161 EXPORT_SYMBOL(fcoe_ctlr_init);
 162
 163 /**
 164  * fcoe_sysfs_fcf_add() - Add a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
 165  * @new: The newly discovered FCF
 166  *
 167  * Called with fip->ctlr_mutex held
 168  */
 169 static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
 170 {
 171         struct fcoe_ctlr *fip = new->fip;
 172         struct fcoe_ctlr_device *ctlr_dev;
 173         struct fcoe_fcf_device *temp, *fcf_dev;
 174         int rc = -ENOMEM;
 175
 176         LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
 177                         new->fabric_name, new->fcf_mac);
 178
 179         temp = kzalloc(sizeof(*temp), GFP_KERNEL);
 180         if (!temp)
 181                 goto out;
 182
 183         temp->fabric_name = new->fabric_name;
 184         temp->switch_name = new->switch_name;
 185         temp->fc_map = new->fc_map;
 186         temp->vfid = new->vfid;
 187         memcpy(temp->mac, new->fcf_mac, ETH_ALEN);
 188         temp->priority = new->pri;
 189         temp->fka_period = new->fka_period;
 190         temp->selected = 0; /* default to unselected */
 191
 192         /*
 193          * If ctlr_dev doesn't exist then it means we're a libfcoe user
 194          * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device.
 195          * fnic would be an example of a driver with this behavior. In this
 196          * case we want to add the fcoe_fcf to the fcoe_ctlr list, but we
 197          * don't want to make sysfs changes.
 198          */
 199
 200         ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
 201         if (ctlr_dev) {
 202                 mutex_lock(&ctlr_dev->lock);
 203                 fcf_dev = fcoe_fcf_device_add(ctlr_dev, temp);
 204                 if (unlikely(!fcf_dev)) {
 205                         rc = -ENOMEM;
 206                         mutex_unlock(&ctlr_dev->lock);
 207                         goto out;
 208                 }
 209
 210                 /*
 211                  * The fcoe_sysfs layer can return a CONNECTED fcf that
 212                  * has a priv (fcf was never deleted) or a CONNECTED fcf
 213                  * that doesn't have a priv (fcf was deleted). However,
 214                  * libfcoe will always delete FCFs before trying to add
 215                  * them. This is ensured because both recv_adv and
 216                  * age_fcfs are protected by the the fcoe_ctlr's mutex.
 217                  * This means that we should never get a FCF with a
 218                  * non-NULL priv pointer.
 219                  */
 220                 BUG_ON(fcf_dev->priv);
 221
 222                 fcf_dev->priv = new;
 223                 new->fcf_dev = fcf_dev;
 224                 mutex_unlock(&ctlr_dev->lock);
 225         }
 226
 227         list_add(&new->list, &fip->fcfs);
 228         fip->fcf_count++;
 229         rc = 0;
 230
 231 out:
 232         kfree(temp);
 233         return rc;
 234 }
 235
 236 /**
 237  * fcoe_sysfs_fcf_del() - Remove a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
 238  * @new: The FCF to be removed
 239  *
 240  * Called with fip->ctlr_mutex held
 241  */
 242 static void fcoe_sysfs_fcf_del(struct fcoe_fcf *new)
 243 {
 244         struct fcoe_ctlr *fip = new->fip;
 245         struct fcoe_ctlr_device *cdev;
 246         struct fcoe_fcf_device *fcf_dev;
 247
 248         list_del(&new->list);
 249         fip->fcf_count--;
 250
 251         /*
 252          * If ctlr_dev doesn't exist then it means we're a libfcoe user
 253          * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device
 254          * or a fcoe_fcf_device.
 255          *
 256          * fnic would be an example of a driver with this behavior. In this
 257          * case we want to remove the fcoe_fcf from the fcoe_ctlr list (above),
 258          * but we don't want to make sysfs changes.
 259          */
 260         cdev = fcoe_ctlr_to_ctlr_dev(fip);
 261         if (cdev) {
 262                 mutex_lock(&cdev->lock);
 263                 fcf_dev = fcoe_fcf_to_fcf_dev(new);
 264                 WARN_ON(!fcf_dev);
 265                 new->fcf_dev = NULL;
 266                 fcoe_fcf_device_delete(fcf_dev);
 267                 kfree(new);
 268                 mutex_unlock(&cdev->lock);
 269         }
 270 }
 271
 272 /**
 273  * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
 274  * @fip: The FCoE controller whose FCFs are to be reset
 275  *
 276  * Called with &fcoe_ctlr lock held.
 277  */
 278 static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
 279 {
 280         struct fcoe_fcf *fcf;
 281         struct fcoe_fcf *next;
 282
 283         fip->sel_fcf = NULL;
 284         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 285                 fcoe_sysfs_fcf_del(fcf);
 286         }
 287         WARN_ON(fip->fcf_count);
 288
 289         fip->sel_time = 0;
 290 }
 291
 292 /**
 293  * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
 294  * @fip: The FCoE controller to tear down
 295  *
 296  * This is called by FCoE drivers before freeing the &fcoe_ctlr.
 297  *
 298  * The receive handler will have been deleted before this to guarantee
 299  * that no more recv_work will be scheduled.
 300  *
 301  * The timer routine will simply return once we set FIP_ST_DISABLED.
 302  * This guarantees that no further timeouts or work will be scheduled.
 303  */
 304 void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
 305 {
 306         cancel_work_sync(&fip->recv_work);
 307         skb_queue_purge(&fip->fip_recv_list);
 308
 309         mutex_lock(&fip->ctlr_mutex);
 310         fcoe_ctlr_set_state(fip, FIP_ST_DISABLED);
 311         fcoe_ctlr_reset_fcfs(fip);
 312         mutex_unlock(&fip->ctlr_mutex);
 313         del_timer_sync(&fip->timer);
 314         cancel_work_sync(&fip->timer_work);
 315 }
 316 EXPORT_SYMBOL(fcoe_ctlr_destroy);
 317
 318 /**
 319  * fcoe_ctlr_announce() - announce new FCF selection
 320  * @fip: The FCoE controller
 321  *
 322  * Also sets the destination MAC for FCoE and control packets
 323  *
 324  * Called with neither ctlr_mutex nor ctlr_lock held.
 325  */
 326 static void fcoe_ctlr_announce(struct fcoe_ctlr *fip)
 327 {
 328         struct fcoe_fcf *sel;
 329         struct fcoe_fcf *fcf;
 330
 331         mutex_lock(&fip->ctlr_mutex);
 332         spin_lock_bh(&fip->ctlr_lock);
 333
 334         kfree_skb(fip->flogi_req);
 335         fip->flogi_req = NULL;
 336         list_for_each_entry(fcf, &fip->fcfs, list)
 337                 fcf->flogi_sent = 0;
 338
 339         spin_unlock_bh(&fip->ctlr_lock);
 340         sel = fip->sel_fcf;
 341
 342         if (sel && ether_addr_equal(sel->fcf_mac, fip->dest_addr))
 343                 goto unlock;
 344         if (!is_zero_ether_addr(fip->dest_addr)) {
 345                 printk(KERN_NOTICE "libfcoe: host%d: "
 346                        "FIP Fibre-Channel Forwarder MAC %pM deselected\n",
 347                        fip->lp->host->host_no, fip->dest_addr);
 348                 memset(fip->dest_addr, 0, ETH_ALEN);
 349         }
 350         if (sel) {
 351                 printk(KERN_INFO "libfcoe: host%d: FIP selected "
 352                        "Fibre-Channel Forwarder MAC %pM\n",
 353                        fip->lp->host->host_no, sel->fcf_mac);
 354                 memcpy(fip->dest_addr, sel->fcoe_mac, ETH_ALEN);
 355                 fip->map_dest = 0;
 356         }
 357 unlock:
 358         mutex_unlock(&fip->ctlr_mutex);
 359 }
 360
 361 /**
 362  * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
 363  * @fip: The FCoE controller to get the maximum FCoE size from
 364  *
 365  * Returns the maximum packet size including the FCoE header and trailer,
 366  * but not including any Ethernet or VLAN headers.
 367  */
 368 static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
 369 {
 370         /*
 371          * Determine the max FCoE frame size allowed, including
 372          * FCoE header and trailer.
 373          * Note:  lp->mfs is currently the payload size, not the frame size.
 374          */
 375         return fip->lp->mfs + sizeof(struct fc_frame_header) +
 376                 sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
 377 }
 378
 379 /**
 380  * fcoe_ctlr_solicit() - Send a FIP solicitation
 381  * @fip: The FCoE controller to send the solicitation on
 382  * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
 383  */
 384 static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
 385 {
 386         struct sk_buff *skb;
 387         struct fip_sol {
 388                 struct ethhdr eth;
 389                 struct fip_header fip;
 390                 struct {
 391                         struct fip_mac_desc mac;
 392                         struct fip_wwn_desc wwnn;
 393                         struct fip_size_desc size;
 394                 } __packed desc;
 395         }  __packed * sol;
 396         u32 fcoe_size;
 397
 398         skb = dev_alloc_skb(sizeof(*sol));
 399         if (!skb)
 400                 return;
 401
 402         sol = (struct fip_sol *)skb->data;
 403
 404         memset(sol, 0, sizeof(*sol));
 405         memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
 406         memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 407         sol->eth.h_proto = htons(ETH_P_FIP);
 408
 409         sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 410         sol->fip.fip_op = htons(FIP_OP_DISC);
 411         sol->fip.fip_subcode = FIP_SC_SOL;
 412         sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
 413         sol->fip.fip_flags = htons(FIP_FL_FPMA);
 414         if (fip->spma)
 415                 sol->fip.fip_flags |= htons(FIP_FL_SPMA);
 416
 417         sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
 418         sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
 419         memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 420
 421         sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
 422         sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
 423         put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
 424
 425         fcoe_size = fcoe_ctlr_fcoe_size(fip);
 426         sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
 427         sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
 428         sol->desc.size.fd_size = htons(fcoe_size);
 429
 430         skb_put(skb, sizeof(*sol));
 431         skb->protocol = htons(ETH_P_FIP);
 432         skb->priority = fip->priority;
 433         skb_reset_mac_header(skb);
 434         skb_reset_network_header(skb);
 435         fip->send(fip, skb);
 436
 437         if (!fcf)
 438                 fip->sol_time = jiffies;
 439 }
 440
 441 /**
 442  * fcoe_ctlr_link_up() - Start FCoE controller
 443  * @fip: The FCoE controller to start
 444  *
 445  * Called from the LLD when the network link is ready.
 446  */
 447 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
 448 {
 449         mutex_lock(&fip->ctlr_mutex);
 450         if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
 451                 mutex_unlock(&fip->ctlr_mutex);
 452                 fc_linkup(fip->lp);
 453         } else if (fip->state == FIP_ST_LINK_WAIT) {
 454                 fcoe_ctlr_set_state(fip, fip->mode);
 455                 switch (fip->mode) {
 456                 default:
 457                         LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode);
 458                         /* fall-through */
 459                 case FIP_MODE_AUTO:
 460                         LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
 461                         /* fall-through */
 462                 case FIP_MODE_FABRIC:
 463                 case FIP_MODE_NON_FIP:
 464                         mutex_unlock(&fip->ctlr_mutex);
 465                         fc_linkup(fip->lp);
 466                         fcoe_ctlr_solicit(fip, NULL);
 467                         break;
 468                 case FIP_MODE_VN2VN:
 469                         fcoe_ctlr_vn_start(fip);
 470                         mutex_unlock(&fip->ctlr_mutex);
 471                         fc_linkup(fip->lp);
 472                         break;
 473                 }
 474         } else
 475                 mutex_unlock(&fip->ctlr_mutex);
 476 }
 477 EXPORT_SYMBOL(fcoe_ctlr_link_up);
 478
 479 /**
 480  * fcoe_ctlr_reset() - Reset a FCoE controller
 481  * @fip:       The FCoE controller to reset
 482  */
 483 static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
 484 {
 485         fcoe_ctlr_reset_fcfs(fip);
 486         del_timer(&fip->timer);
 487         fip->ctlr_ka_time = 0;
 488         fip->port_ka_time = 0;
 489         fip->sol_time = 0;
 490         fip->flogi_oxid = FC_XID_UNKNOWN;
 491         fcoe_ctlr_map_dest(fip);
 492 }
 493
 494 /**
 495  * fcoe_ctlr_link_down() - Stop a FCoE controller
 496  * @fip: The FCoE controller to be stopped
 497  *
 498  * Returns non-zero if the link was up and now isn't.
 499  *
 500  * Called from the LLD when the network link is not ready.
 501  * There may be multiple calls while the link is down.
 502  */
 503 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
 504 {
 505         int link_dropped;
 506
 507         LIBFCOE_FIP_DBG(fip, "link down.\n");
 508         mutex_lock(&fip->ctlr_mutex);
 509         fcoe_ctlr_reset(fip);
 510         link_dropped = fip->state != FIP_ST_LINK_WAIT;
 511         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
 512         mutex_unlock(&fip->ctlr_mutex);
 513
 514         if (link_dropped)
 515                 fc_linkdown(fip->lp);
 516         return link_dropped;
 517 }
 518 EXPORT_SYMBOL(fcoe_ctlr_link_down);
 519
 520 /**
 521  * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
 522  * @fip:   The FCoE controller to send the FKA on
 523  * @lport: libfc fc_lport to send from
 524  * @ports: 0 for controller keep-alive, 1 for port keep-alive
 525  * @sa:    The source MAC address
 526  *
 527  * A controller keep-alive is sent every fka_period (typically 8 seconds).
 528  * The source MAC is the native MAC address.
 529  *
 530  * A port keep-alive is sent every 90 seconds while logged in.
 531  * The source MAC is the assigned mapped source address.
 532  * The destination is the FCF's F-port.
 533  */
 534 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
 535                                       struct fc_lport *lport,
 536                                       int ports, u8 *sa)
 537 {
 538         struct sk_buff *skb;
 539         struct fip_kal {
 540                 struct ethhdr eth;
 541                 struct fip_header fip;
 542                 struct fip_mac_desc mac;
 543         } __packed * kal;
 544         struct fip_vn_desc *vn;
 545         u32 len;
 546         struct fc_lport *lp;
 547         struct fcoe_fcf *fcf;
 548
 549         fcf = fip->sel_fcf;
 550         lp = fip->lp;
 551         if (!fcf || (ports && !lp->port_id))
 552                 return;
 553
 554         len = sizeof(*kal) + ports * sizeof(*vn);
 555         skb = dev_alloc_skb(len);
 556         if (!skb)
 557                 return;
 558
 559         kal = (struct fip_kal *)skb->data;
 560         memset(kal, 0, len);
 561         memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 562         memcpy(kal->eth.h_source, sa, ETH_ALEN);
 563         kal->eth.h_proto = htons(ETH_P_FIP);
 564
 565         kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 566         kal->fip.fip_op = htons(FIP_OP_CTRL);
 567         kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
 568         kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
 569                                      ports * sizeof(*vn)) / FIP_BPW);
 570         kal->fip.fip_flags = htons(FIP_FL_FPMA);
 571         if (fip->spma)
 572                 kal->fip.fip_flags |= htons(FIP_FL_SPMA);
 573
 574         kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
 575         kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
 576         memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 577         if (ports) {
 578                 vn = (struct fip_vn_desc *)(kal + 1);
 579                 vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
 580                 vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
 581                 memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
 582                 hton24(vn->fd_fc_id, lport->port_id);
 583                 put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
 584         }
 585         skb_put(skb, len);
 586         skb->protocol = htons(ETH_P_FIP);
 587         skb->priority = fip->priority;
 588         skb_reset_mac_header(skb);
 589         skb_reset_network_header(skb);
 590         fip->send(fip, skb);
 591 }
 592
 593 /**
 594  * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
 595  * @fip:   The FCoE controller for the ELS frame
 596  * @dtype: The FIP descriptor type for the frame
 597  * @skb:   The FCoE ELS frame including FC header but no FCoE headers
 598  * @d_id:  The destination port ID.
 599  *
 600  * Returns non-zero error code on failure.
 601  *
 602  * The caller must check that the length is a multiple of 4.
 603  *
 604  * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
 605  * Headroom includes the FIP encapsulation description, FIP header, and
 606  * Ethernet header.  The tailroom is for the FIP MAC descriptor.
 607  */
 608 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
 609                             u8 dtype, struct sk_buff *skb, u32 d_id)
 610 {
 611         struct fip_encaps_head {
 612                 struct ethhdr eth;
 613                 struct fip_header fip;
 614                 struct fip_encaps encaps;
 615         } __packed * cap;
 616         struct fc_frame_header *fh;
 617         struct fip_mac_desc *mac;
 618         struct fcoe_fcf *fcf;
 619         size_t dlen;
 620         u16 fip_flags;
 621         u8 op;
 622
 623         fh = (struct fc_frame_header *)skb->data;
 624         op = *(u8 *)(fh + 1);
 625         dlen = sizeof(struct fip_encaps) + skb->len;    /* len before push */
 626         cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));
 627         memset(cap, 0, sizeof(*cap));
 628
 629         if (lport->point_to_multipoint) {
 630                 if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest))
 631                         return -ENODEV;
 632                 fip_flags = 0;
 633         } else {
 634                 fcf = fip->sel_fcf;
 635                 if (!fcf)
 636                         return -ENODEV;
 637                 fip_flags = fcf->flags;
 638                 fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA :
 639                                          FIP_FL_FPMA;
 640                 if (!fip_flags)
 641                         return -ENODEV;
 642                 memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 643         }
 644         memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 645         cap->eth.h_proto = htons(ETH_P_FIP);
 646
 647         cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 648         cap->fip.fip_op = htons(FIP_OP_LS);
 649         if (op == ELS_LS_ACC || op == ELS_LS_RJT)
 650                 cap->fip.fip_subcode = FIP_SC_REP;
 651         else
 652                 cap->fip.fip_subcode = FIP_SC_REQ;
 653         cap->fip.fip_flags = htons(fip_flags);
 654
 655         cap->encaps.fd_desc.fip_dtype = dtype;
 656         cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
 657
 658         if (op != ELS_LS_RJT) {
 659                 dlen += sizeof(*mac);
 660                 mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
 661                 memset(mac, 0, sizeof(*mac));
 662                 mac->fd_desc.fip_dtype = FIP_DT_MAC;
 663                 mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
 664                 if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
 665                         memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
 666                 } else if (fip->mode == FIP_MODE_VN2VN) {
 667                         hton24(mac->fd_mac, FIP_VN_FC_MAP);
 668                         hton24(mac->fd_mac + 3, fip->port_id);
 669                 } else if (fip_flags & FIP_FL_SPMA) {
 670                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
 671                         memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
 672                 } else {
 673                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
 674                         /* FPMA only FLOGI.  Must leave the MAC desc zeroed. */
 675                 }
 676         }
 677         cap->fip.fip_dl_len = htons(dlen / FIP_BPW);
 678
 679         skb->protocol = htons(ETH_P_FIP);
 680         skb->priority = fip->priority;
 681         skb_reset_mac_header(skb);
 682         skb_reset_network_header(skb);
 683         return 0;
 684 }
 685
 686 /**
 687  * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
 688  * @fip:        FCoE controller.
 689  * @lport:      libfc fc_lport to send from
 690  * @skb:        FCoE ELS frame including FC header but no FCoE headers.
 691  *
 692  * Returns a non-zero error code if the frame should not be sent.
 693  * Returns zero if the caller should send the frame with FCoE encapsulation.
 694  *
 695  * The caller must check that the length is a multiple of 4.
 696  * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
 697  * The the skb must also be an fc_frame.
 698  *
 699  * This is called from the lower-level driver with spinlocks held,
 700  * so we must not take a mutex here.
 701  */
 702 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
 703                        struct sk_buff *skb)
 704 {
 705         struct fc_frame *fp;
 706         struct fc_frame_header *fh;
 707         u16 old_xid;
 708         u8 op;
 709         u8 mac[ETH_ALEN];
 710
 711         fp = container_of(skb, struct fc_frame, skb);
 712         fh = (struct fc_frame_header *)skb->data;
 713         op = *(u8 *)(fh + 1);
 714
 715         if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) {
 716                 old_xid = fip->flogi_oxid;
 717                 fip->flogi_oxid = ntohs(fh->fh_ox_id);
 718                 if (fip->state == FIP_ST_AUTO) {
 719                         if (old_xid == FC_XID_UNKNOWN)
 720                                 fip->flogi_count = 0;
 721                         fip->flogi_count++;
 722                         if (fip->flogi_count < 3)
 723                                 goto drop;
 724                         fcoe_ctlr_map_dest(fip);
 725                         return 0;
 726                 }
 727                 if (fip->state == FIP_ST_NON_FIP)
 728                         fcoe_ctlr_map_dest(fip);
 729         }
 730
 731         if (fip->state == FIP_ST_NON_FIP)
 732                 return 0;
 733         if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN)
 734                 goto drop;
 735         switch (op) {
 736         case ELS_FLOGI:
 737                 op = FIP_DT_FLOGI;
 738                 if (fip->mode == FIP_MODE_VN2VN)
 739                         break;
 740                 spin_lock_bh(&fip->ctlr_lock);
 741                 kfree_skb(fip->flogi_req);
 742                 fip->flogi_req = skb;
 743                 fip->flogi_req_send = 1;
 744                 spin_unlock_bh(&fip->ctlr_lock);
 745                 schedule_work(&fip->timer_work);
 746                 return -EINPROGRESS;
 747         case ELS_FDISC:
 748                 if (ntoh24(fh->fh_s_id))
 749                         return 0;
 750                 op = FIP_DT_FDISC;
 751                 break;
 752         case ELS_LOGO:
 753                 if (fip->mode == FIP_MODE_VN2VN) {
 754                         if (fip->state != FIP_ST_VNMP_UP)
 755                                 return -EINVAL;
 756                         if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI)
 757                                 return -EINVAL;
 758                 } else {
 759                         if (fip->state != FIP_ST_ENABLED)
 760                                 return 0;
 761                         if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
 762                                 return 0;
 763                 }
 764                 op = FIP_DT_LOGO;
 765                 break;
 766         case ELS_LS_ACC:
 767                 /*
 768                  * If non-FIP, we may have gotten an SID by accepting an FLOGI
 769                  * from a point-to-point connection.  Switch to using
 770                  * the source mac based on the SID.  The destination
 771                  * MAC in this case would have been set by receiving the
 772                  * FLOGI.
 773                  */
 774                 if (fip->state == FIP_ST_NON_FIP) {
 775                         if (fip->flogi_oxid == FC_XID_UNKNOWN)
 776                                 return 0;
 777                         fip->flogi_oxid = FC_XID_UNKNOWN;
 778                         fc_fcoe_set_mac(mac, fh->fh_d_id);
 779                         fip->update_mac(lport, mac);
 780                 }
 781                 /* fall through */
 782         case ELS_LS_RJT:
 783                 op = fr_encaps(fp);
 784                 if (op)
 785                         break;
 786                 return 0;
 787         default:
 788                 if (fip->state != FIP_ST_ENABLED &&
 789                     fip->state != FIP_ST_VNMP_UP)
 790                         goto drop;
 791                 return 0;
 792         }
 793         LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n",
 794                         op, ntoh24(fh->fh_d_id));
 795         if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id)))
 796                 goto drop;
 797         fip->send(fip, skb);
 798         return -EINPROGRESS;
 799 drop:
 800         kfree_skb(skb);
 801         return -EINVAL;
 802 }
 803 EXPORT_SYMBOL(fcoe_ctlr_els_send);
 804
 805 /**
 806  * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
 807  * @fip: The FCoE controller to free FCFs on
 808  *
 809  * Called with lock held and preemption disabled.
 810  *
 811  * An FCF is considered old if we have missed two advertisements.
 812  * That is, there have been no valid advertisement from it for 2.5
 813  * times its keep-alive period.
 814  *
 815  * In addition, determine the time when an FCF selection can occur.
 816  *
 817  * Also, increment the MissDiscAdvCount when no advertisement is received
 818  * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
 819  *
 820  * Returns the time in jiffies for the next call.
 821  */
 822 static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
 823 {
 824         struct fcoe_fcf *fcf;
 825         struct fcoe_fcf *next;
 826         unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
 827         unsigned long deadline;
 828         unsigned long sel_time = 0;
 829         struct list_head del_list;
 830         struct fc_stats *stats;
 831
 832         INIT_LIST_HEAD(&del_list);
 833
 834         stats = per_cpu_ptr(fip->lp->stats, get_cpu_light());
 835
 836         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 837                 deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
 838                 if (fip->sel_fcf == fcf) {
 839                         if (time_after(jiffies, deadline)) {
 840                                 stats->MissDiscAdvCount++;
 841                                 printk(KERN_INFO "libfcoe: host%d: "
 842                                        "Missing Discovery Advertisement "
 843                                        "for fab %16.16llx count %lld\n",
 844                                        fip->lp->host->host_no, fcf->fabric_name,
 845                                        stats->MissDiscAdvCount);
 846                         } else if (time_after(next_timer, deadline))
 847                                 next_timer = deadline;
 848                 }
 849
 850                 deadline += fcf->fka_period;
 851                 if (time_after_eq(jiffies, deadline)) {
 852                         if (fip->sel_fcf == fcf)
 853                                 fip->sel_fcf = NULL;
 854                         /*
 855                          * Move to delete list so we can call
 856                          * fcoe_sysfs_fcf_del (which can sleep)
 857                          * after the put_cpu().
 858                          */
 859                         list_del(&fcf->list);
 860                         list_add(&fcf->list, &del_list);
 861                         stats->VLinkFailureCount++;
 862                 } else {
 863                         if (time_after(next_timer, deadline))
 864                                 next_timer = deadline;
 865                         if (fcoe_ctlr_mtu_valid(fcf) &&
 866                             (!sel_time || time_before(sel_time, fcf->time)))
 867                                 sel_time = fcf->time;
 868                 }
 869         }
 870         put_cpu_light();
 871
 872         list_for_each_entry_safe(fcf, next, &del_list, list) {
 873                 /* Removes fcf from current list */
 874                 fcoe_sysfs_fcf_del(fcf);
 875         }
 876
 877         if (sel_time && !fip->sel_fcf && !fip->sel_time) {
 878                 sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
 879                 fip->sel_time = sel_time;
 880         }
 881
 882         return next_timer;
 883 }
 884
 885 /**
 886  * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
 887  * @fip: The FCoE controller receiving the advertisement
 888  * @skb: The received FIP advertisement frame
 889  * @fcf: The resulting FCF entry
 890  *
 891  * Returns zero on a valid parsed advertisement,
 892  * otherwise returns non zero value.
 893  */
 894 static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
 895                                struct sk_buff *skb, struct fcoe_fcf *fcf)
 896 {
 897         struct fip_header *fiph;
 898         struct fip_desc *desc = NULL;
 899         struct fip_wwn_desc *wwn;
 900         struct fip_fab_desc *fab;
 901         struct fip_fka_desc *fka;
 902         unsigned long t;
 903         size_t rlen;
 904         size_t dlen;
 905         u32 desc_mask;
 906
 907         memset(fcf, 0, sizeof(*fcf));
 908         fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
 909
 910         fiph = (struct fip_header *)skb->data;
 911         fcf->flags = ntohs(fiph->fip_flags);
 912
 913         /*
 914          * mask of required descriptors. validating each one clears its bit.
 915          */
 916         desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
 917                         BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA);
 918
 919         rlen = ntohs(fiph->fip_dl_len) * 4;
 920         if (rlen + sizeof(*fiph) > skb->len)
 921                 return -EINVAL;
 922
 923         desc = (struct fip_desc *)(fiph + 1);
 924         while (rlen > 0) {
 925                 dlen = desc->fip_dlen * FIP_BPW;
 926                 if (dlen < sizeof(*desc) || dlen > rlen)
 927                         return -EINVAL;
 928                 /* Drop Adv if there are duplicate critical descriptors */
 929                 if ((desc->fip_dtype < 32) &&
 930                     !(desc_mask & 1U << desc->fip_dtype)) {
 931                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
 932                                         "Descriptors in FIP adv\n");
 933                         return -EINVAL;
 934                 }
 935                 switch (desc->fip_dtype) {
 936                 case FIP_DT_PRI:
 937                         if (dlen != sizeof(struct fip_pri_desc))
 938                                 goto len_err;
 939                         fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
 940                         desc_mask &= ~BIT(FIP_DT_PRI);
 941                         break;
 942                 case FIP_DT_MAC:
 943                         if (dlen != sizeof(struct fip_mac_desc))
 944                                 goto len_err;
 945                         memcpy(fcf->fcf_mac,
 946                                ((struct fip_mac_desc *)desc)->fd_mac,
 947                                ETH_ALEN);
 948                         memcpy(fcf->fcoe_mac, fcf->fcf_mac, ETH_ALEN);
 949                         if (!is_valid_ether_addr(fcf->fcf_mac)) {
 950                                 LIBFCOE_FIP_DBG(fip,
 951                                         "Invalid MAC addr %pM in FIP adv\n",
 952                                         fcf->fcf_mac);
 953                                 return -EINVAL;
 954                         }
 955                         desc_mask &= ~BIT(FIP_DT_MAC);
 956                         break;
 957                 case FIP_DT_NAME:
 958                         if (dlen != sizeof(struct fip_wwn_desc))
 959                                 goto len_err;
 960                         wwn = (struct fip_wwn_desc *)desc;
 961                         fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
 962                         desc_mask &= ~BIT(FIP_DT_NAME);
 963                         break;
 964                 case FIP_DT_FAB:
 965                         if (dlen != sizeof(struct fip_fab_desc))
 966                                 goto len_err;
 967                         fab = (struct fip_fab_desc *)desc;
 968                         fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
 969                         fcf->vfid = ntohs(fab->fd_vfid);
 970                         fcf->fc_map = ntoh24(fab->fd_map);
 971                         desc_mask &= ~BIT(FIP_DT_FAB);
 972                         break;
 973                 case FIP_DT_FKA:
 974                         if (dlen != sizeof(struct fip_fka_desc))
 975                                 goto len_err;
 976                         fka = (struct fip_fka_desc *)desc;
 977                         if (fka->fd_flags & FIP_FKA_ADV_D)
 978                                 fcf->fd_flags = 1;
 979                         t = ntohl(fka->fd_fka_period);
 980                         if (t >= FCOE_CTLR_MIN_FKA)
 981                                 fcf->fka_period = msecs_to_jiffies(t);
 982                         desc_mask &= ~BIT(FIP_DT_FKA);
 983                         break;
 984                 case FIP_DT_MAP_OUI:
 985                 case FIP_DT_FCOE_SIZE:
 986                 case FIP_DT_FLOGI:
 987                 case FIP_DT_FDISC:
 988                 case FIP_DT_LOGO:
 989                 case FIP_DT_ELP:
 990                 default:
 991                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
 992                                         "in FIP adv\n", desc->fip_dtype);
 993                         /* standard says ignore unknown descriptors >= 128 */
 994                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
 995                                 return -EINVAL;
 996                         break;
 997                 }
 998                 desc = (struct fip_desc *)((char *)desc + dlen);
 999                 rlen -= dlen;
1000         }
1001         if (!fcf->fc_map || (fcf->fc_map & 0x10000))
1002                 return -EINVAL;
1003         if (!fcf->switch_name)
1004                 return -EINVAL;
1005         if (desc_mask) {
1006                 LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n",
1007                                 desc_mask);
1008                 return -EINVAL;
1009         }
1010         return 0;
1011
1012 len_err:
1013         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1014                         desc->fip_dtype, dlen);
1015         return -EINVAL;
1016 }
1017
1018 /**
1019  * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
1020  * @fip: The FCoE controller receiving the advertisement
1021  * @skb: The received FIP packet
1022  */
1023 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1024 {
1025         struct fcoe_fcf *fcf;
1026         struct fcoe_fcf new;
1027         unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
1028         int first = 0;
1029         int mtu_valid;
1030         int found = 0;
1031         int rc = 0;
1032
1033         if (fcoe_ctlr_parse_adv(fip, skb, &new))
1034                 return;
1035
1036         mutex_lock(&fip->ctlr_mutex);
1037         first = list_empty(&fip->fcfs);
1038         list_for_each_entry(fcf, &fip->fcfs, list) {
1039                 if (fcf->switch_name == new.switch_name &&
1040                     fcf->fabric_name == new.fabric_name &&
1041                     fcf->fc_map == new.fc_map &&
1042                     ether_addr_equal(fcf->fcf_mac, new.fcf_mac)) {
1043                         found = 1;
1044                         break;
1045                 }
1046         }
1047         if (!found) {
1048                 if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
1049                         goto out;
1050
1051                 fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
1052                 if (!fcf)
1053                         goto out;
1054
1055                 memcpy(fcf, &new, sizeof(new));
1056                 fcf->fip = fip;
1057                 rc = fcoe_sysfs_fcf_add(fcf);
1058                 if (rc) {
1059                         printk(KERN_ERR "Failed to allocate sysfs instance "
1060                                "for FCF, fab %16.16llx mac %pM\n",
1061                                new.fabric_name, new.fcf_mac);
1062                         kfree(fcf);
1063                         goto out;
1064                 }
1065         } else {
1066                 /*
1067                  * Update the FCF's keep-alive descriptor flags.
1068                  * Other flag changes from new advertisements are
1069                  * ignored after a solicited advertisement is
1070                  * received and the FCF is selectable (usable).
1071                  */
1072                 fcf->fd_flags = new.fd_flags;
1073                 if (!fcoe_ctlr_fcf_usable(fcf))
1074                         fcf->flags = new.flags;
1075
1076                 if (fcf == fip->sel_fcf && !fcf->fd_flags) {
1077                         fip->ctlr_ka_time -= fcf->fka_period;
1078                         fip->ctlr_ka_time += new.fka_period;
1079                         if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1080                                 mod_timer(&fip->timer, fip->ctlr_ka_time);
1081                 }
1082                 fcf->fka_period = new.fka_period;
1083                 memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
1084         }
1085
1086         mtu_valid = fcoe_ctlr_mtu_valid(fcf);
1087         fcf->time = jiffies;
1088         if (!found)
1089                 LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
1090                                 fcf->fabric_name, fcf->fcf_mac);
1091
1092         /*
1093          * If this advertisement is not solicited and our max receive size
1094          * hasn't been verified, send a solicited advertisement.
1095          */
1096         if (!mtu_valid)
1097                 fcoe_ctlr_solicit(fip, fcf);
1098
1099         /*
1100          * If its been a while since we did a solicit, and this is
1101          * the first advertisement we've received, do a multicast
1102          * solicitation to gather as many advertisements as we can
1103          * before selection occurs.
1104          */
1105         if (first && time_after(jiffies, fip->sol_time + sol_tov))
1106                 fcoe_ctlr_solicit(fip, NULL);
1107
1108         /*
1109          * Put this FCF at the head of the list for priority among equals.
1110          * This helps in the case of an NPV switch which insists we use
1111          * the FCF that answers multicast solicitations, not the others that
1112          * are sending periodic multicast advertisements.
1113          */
1114         if (mtu_valid)
1115                 list_move(&fcf->list, &fip->fcfs);
1116
1117         /*
1118          * If this is the first validated FCF, note the time and
1119          * set a timer to trigger selection.
1120          */
1121         if (mtu_valid && !fip->sel_fcf && fcoe_ctlr_fcf_usable(fcf)) {
1122                 fip->sel_time = jiffies +
1123                         msecs_to_jiffies(FCOE_CTLR_START_DELAY);
1124                 if (!timer_pending(&fip->timer) ||
1125                     time_before(fip->sel_time, fip->timer.expires))
1126                         mod_timer(&fip->timer, fip->sel_time);
1127         }
1128
1129 out:
1130         mutex_unlock(&fip->ctlr_mutex);
1131 }
1132
1133 /**
1134  * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
1135  * @fip: The FCoE controller which received the packet
1136  * @skb: The received FIP packet
1137  */
1138 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
1139 {
1140         struct fc_lport *lport = fip->lp;
1141         struct fip_header *fiph;
1142         struct fc_frame *fp = (struct fc_frame *)skb;
1143         struct fc_frame_header *fh = NULL;
1144         struct fip_desc *desc;
1145         struct fip_encaps *els;
1146         struct fcoe_fcf *sel;
1147         struct fc_stats *stats;
1148         enum fip_desc_type els_dtype = 0;
1149         u8 els_op;
1150         u8 sub;
1151         u8 granted_mac[ETH_ALEN] = { 0 };
1152         size_t els_len = 0;
1153         size_t rlen;
1154         size_t dlen;
1155         u32 desc_mask = 0;
1156         u32 desc_cnt = 0;
1157
1158         fiph = (struct fip_header *)skb->data;
1159         sub = fiph->fip_subcode;
1160         if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
1161                 goto drop;
1162
1163         rlen = ntohs(fiph->fip_dl_len) * 4;
1164         if (rlen + sizeof(*fiph) > skb->len)
1165                 goto drop;
1166
1167         desc = (struct fip_desc *)(fiph + 1);
1168         while (rlen > 0) {
1169                 desc_cnt++;
1170                 dlen = desc->fip_dlen * FIP_BPW;
1171                 if (dlen < sizeof(*desc) || dlen > rlen)
1172                         goto drop;
1173                 /* Drop ELS if there are duplicate critical descriptors */
1174                 if (desc->fip_dtype < 32) {
1175                         if ((desc->fip_dtype != FIP_DT_MAC) &&
1176                             (desc_mask & 1U << desc->fip_dtype)) {
1177                                 LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1178                                                 "Descriptors in FIP ELS\n");
1179                                 goto drop;
1180                         }
1181                         desc_mask |= (1 << desc->fip_dtype);
1182                 }
1183                 switch (desc->fip_dtype) {
1184                 case FIP_DT_MAC:
1185                         sel = fip->sel_fcf;
1186                         if (desc_cnt == 1) {
1187                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1188                                                 "received out of order\n");
1189                                 goto drop;
1190                         }
1191                         /*
1192                          * Some switch implementations send two MAC descriptors,
1193                          * with first MAC(granted_mac) being the FPMA, and the
1194                          * second one(fcoe_mac) is used as destination address
1195                          * for sending/receiving FCoE packets. FIP traffic is
1196                          * sent using fip_mac. For regular switches, both
1197                          * fip_mac and fcoe_mac would be the same.
1198                          */
1199                         if (desc_cnt == 2)
1200                                 memcpy(granted_mac,
1201                                        ((struct fip_mac_desc *)desc)->fd_mac,
1202                                        ETH_ALEN);
1203
1204                         if (dlen != sizeof(struct fip_mac_desc))
1205                                 goto len_err;
1206
1207                         if ((desc_cnt == 3) && (sel))
1208                                 memcpy(sel->fcoe_mac,
1209                                        ((struct fip_mac_desc *)desc)->fd_mac,
1210                                        ETH_ALEN);
1211                         break;
1212                 case FIP_DT_FLOGI:
1213                 case FIP_DT_FDISC:
1214                 case FIP_DT_LOGO:
1215                 case FIP_DT_ELP:
1216                         if (desc_cnt != 1) {
1217                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1218                                                 "received out of order\n");
1219                                 goto drop;
1220                         }
1221                         if (fh)
1222                                 goto drop;
1223                         if (dlen < sizeof(*els) + sizeof(*fh) + 1)
1224                                 goto len_err;
1225                         els_len = dlen - sizeof(*els);
1226                         els = (struct fip_encaps *)desc;
1227                         fh = (struct fc_frame_header *)(els + 1);
1228                         els_dtype = desc->fip_dtype;
1229                         break;
1230                 default:
1231                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
1232                                         "in FIP adv\n", desc->fip_dtype);
1233                         /* standard says ignore unknown descriptors >= 128 */
1234                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1235                                 goto drop;
1236                         if (desc_cnt <= 2) {
1237                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1238                                                 "received out of order\n");
1239                                 goto drop;
1240                         }
1241                         break;
1242                 }
1243                 desc = (struct fip_desc *)((char *)desc + dlen);
1244                 rlen -= dlen;
1245         }
1246
1247         if (!fh)
1248                 goto drop;
1249         els_op = *(u8 *)(fh + 1);
1250
1251         if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) &&
1252             sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) {
1253                 if (els_op == ELS_LS_ACC) {
1254                         if (!is_valid_ether_addr(granted_mac)) {
1255                                 LIBFCOE_FIP_DBG(fip,
1256                                         "Invalid MAC address %pM in FIP ELS\n",
1257                                         granted_mac);
1258                                 goto drop;
1259                         }
1260                         memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
1261
1262                         if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1263                                 fip->flogi_oxid = FC_XID_UNKNOWN;
1264                                 if (els_dtype == FIP_DT_FLOGI)
1265                                         fcoe_ctlr_announce(fip);
1266                         }
1267                 } else if (els_dtype == FIP_DT_FLOGI &&
1268                            !fcoe_ctlr_flogi_retry(fip))
1269                         goto drop;      /* retrying FLOGI so drop reject */
1270         }
1271
1272         if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
1273             (!(1U << FIP_DT_MAC & desc_mask)))) {
1274                 LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
1275                                 "in FIP ELS\n");
1276                 goto drop;
1277         }
1278
1279         /*
1280          * Convert skb into an fc_frame containing only the ELS.
1281          */
1282         skb_pull(skb, (u8 *)fh - skb->data);
1283         skb_trim(skb, els_len);
1284         fp = (struct fc_frame *)skb;
1285         fc_frame_init(fp);
1286         fr_sof(fp) = FC_SOF_I3;
1287         fr_eof(fp) = FC_EOF_T;
1288         fr_dev(fp) = lport;
1289         fr_encaps(fp) = els_dtype;
1290
1291         stats = per_cpu_ptr(lport->stats, get_cpu());
1292         stats->RxFrames++;
1293         stats->RxWords += skb->len / FIP_BPW;
1294         put_cpu();
1295
1296         fc_exch_recv(lport, fp);
1297         return;
1298
1299 len_err:
1300         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1301                         desc->fip_dtype, dlen);
1302 drop:
1303         kfree_skb(skb);
1304 }
1305
1306 /**
1307  * fcoe_ctlr_recv_els() - Handle an incoming link reset frame
1308  * @fip: The FCoE controller that received the frame
1309  * @fh:  The received FIP header
1310  *
1311  * There may be multiple VN_Port descriptors.
1312  * The overall length has already been checked.
1313  */
1314 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
1315                                      struct fip_header *fh)
1316 {
1317         struct fip_desc *desc;
1318         struct fip_mac_desc *mp;
1319         struct fip_wwn_desc *wp;
1320         struct fip_vn_desc *vp;
1321         size_t rlen;
1322         size_t dlen;
1323         struct fcoe_fcf *fcf = fip->sel_fcf;
1324         struct fc_lport *lport = fip->lp;
1325         struct fc_lport *vn_port = NULL;
1326         u32 desc_mask;
1327         int num_vlink_desc;
1328         int reset_phys_port = 0;
1329         struct fip_vn_desc **vlink_desc_arr = NULL;
1330
1331         LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
1332
1333         if (!fcf || !lport->port_id) {
1334                 /*
1335                  * We are yet to select best FCF, but we got CVL in the
1336                  * meantime. reset the ctlr and let it rediscover the FCF
1337                  */
1338                 mutex_lock(&fip->ctlr_mutex);
1339                 fcoe_ctlr_reset(fip);
1340                 mutex_unlock(&fip->ctlr_mutex);
1341                 return;
1342         }
1343
1344         /*
1345          * mask of required descriptors.  Validating each one clears its bit.
1346          */
1347         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
1348
1349         rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
1350         desc = (struct fip_desc *)(fh + 1);
1351
1352         /*
1353          * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
1354          * before determining max Vx_Port descriptor but a buggy FCF could have
1355          * omited either or both MAC Address and Name Identifier descriptors
1356          */
1357         num_vlink_desc = rlen / sizeof(*vp);
1358         if (num_vlink_desc)
1359                 vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc,
1360                                          GFP_ATOMIC);
1361         if (!vlink_desc_arr)
1362                 return;
1363         num_vlink_desc = 0;
1364
1365         while (rlen >= sizeof(*desc)) {
1366                 dlen = desc->fip_dlen * FIP_BPW;
1367                 if (dlen > rlen)
1368                         goto err;
1369                 /* Drop CVL if there are duplicate critical descriptors */
1370                 if ((desc->fip_dtype < 32) &&
1371                     (desc->fip_dtype != FIP_DT_VN_ID) &&
1372                     !(desc_mask & 1U << desc->fip_dtype)) {
1373                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1374                                         "Descriptors in FIP CVL\n");
1375                         goto err;
1376                 }
1377                 switch (desc->fip_dtype) {
1378                 case FIP_DT_MAC:
1379                         mp = (struct fip_mac_desc *)desc;
1380                         if (dlen < sizeof(*mp))
1381                                 goto err;
1382                         if (!ether_addr_equal(mp->fd_mac, fcf->fcf_mac))
1383                                 goto err;
1384                         desc_mask &= ~BIT(FIP_DT_MAC);
1385                         break;
1386                 case FIP_DT_NAME:
1387                         wp = (struct fip_wwn_desc *)desc;
1388                         if (dlen < sizeof(*wp))
1389                                 goto err;
1390                         if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
1391                                 goto err;
1392                         desc_mask &= ~BIT(FIP_DT_NAME);
1393                         break;
1394                 case FIP_DT_VN_ID:
1395                         vp = (struct fip_vn_desc *)desc;
1396                         if (dlen < sizeof(*vp))
1397                                 goto err;
1398                         vlink_desc_arr[num_vlink_desc++] = vp;
1399                         vn_port = fc_vport_id_lookup(lport,
1400                                                       ntoh24(vp->fd_fc_id));
1401                         if (vn_port && (vn_port == lport)) {
1402                                 mutex_lock(&fip->ctlr_mutex);
1403                                 per_cpu_ptr(lport->stats,
1404                                             get_cpu())->VLinkFailureCount++;
1405                                 put_cpu();
1406                                 fcoe_ctlr_reset(fip);
1407                                 mutex_unlock(&fip->ctlr_mutex);
1408                         }
1409                         break;
1410                 default:
1411                         /* standard says ignore unknown descriptors >= 128 */
1412                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1413                                 goto err;
1414                         break;
1415                 }
1416                 desc = (struct fip_desc *)((char *)desc + dlen);
1417                 rlen -= dlen;
1418         }
1419
1420         /*
1421          * reset only if all required descriptors were present and valid.
1422          */
1423         if (desc_mask)
1424                 LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
1425                                 desc_mask);
1426         else if (!num_vlink_desc) {
1427                 LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
1428                 /*
1429                  * No Vx_Port description. Clear all NPIV ports,
1430                  * followed by physical port
1431                  */
1432                 mutex_lock(&fip->ctlr_mutex);
1433                 per_cpu_ptr(lport->stats, get_cpu())->VLinkFailureCount++;
1434                 put_cpu();
1435                 fcoe_ctlr_reset(fip);
1436                 mutex_unlock(&fip->ctlr_mutex);
1437
1438                 mutex_lock(&lport->lp_mutex);
1439                 list_for_each_entry(vn_port, &lport->vports, list)
1440                         fc_lport_reset(vn_port);
1441                 mutex_unlock(&lport->lp_mutex);
1442
1443                 fc_lport_reset(fip->lp);
1444                 fcoe_ctlr_solicit(fip, NULL);
1445         } else {
1446                 int i;
1447
1448                 LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
1449                 for (i = 0; i < num_vlink_desc; i++) {
1450                         vp = vlink_desc_arr[i];
1451                         vn_port = fc_vport_id_lookup(lport,
1452                                                      ntoh24(vp->fd_fc_id));
1453                         if (!vn_port)
1454                                 continue;
1455
1456                         /*
1457                          * 'port_id' is already validated, check MAC address and
1458                          * wwpn
1459                          */
1460                         if (!ether_addr_equal(fip->get_src_addr(vn_port),
1461                                               vp->fd_mac) ||
1462                                 get_unaligned_be64(&vp->fd_wwpn) !=
1463                                                         vn_port->wwpn)
1464                                 continue;
1465
1466                         if (vn_port == lport)
1467                                 /*
1468                                  * Physical port, defer processing till all
1469                                  * listed NPIV ports are cleared
1470                                  */
1471                                 reset_phys_port = 1;
1472                         else    /* NPIV port */
1473                                 fc_lport_reset(vn_port);
1474                 }
1475
1476                 if (reset_phys_port) {
1477                         fc_lport_reset(fip->lp);
1478                         fcoe_ctlr_solicit(fip, NULL);
1479                 }
1480         }
1481
1482 err:
1483         kfree(vlink_desc_arr);
1484 }
1485
1486 /**
1487  * fcoe_ctlr_recv() - Receive a FIP packet
1488  * @fip: The FCoE controller that received the packet
1489  * @skb: The received FIP packet
1490  *
1491  * This may be called from either NET_RX_SOFTIRQ or IRQ.
1492  */
1493 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1494 {
1495         skb = skb_share_check(skb, GFP_ATOMIC);
1496         if (!skb)
1497                 return;
1498         skb_queue_tail(&fip->fip_recv_list, skb);
1499         schedule_work(&fip->recv_work);
1500 }
1501 EXPORT_SYMBOL(fcoe_ctlr_recv);
1502
1503 /**
1504  * fcoe_ctlr_recv_handler() - Receive a FIP frame
1505  * @fip: The FCoE controller that received the frame
1506  * @skb: The received FIP frame
1507  *
1508  * Returns non-zero if the frame is dropped.
1509  */
1510 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
1511 {
1512         struct fip_header *fiph;
1513         struct ethhdr *eh;
1514         enum fip_state state;
1515         u16 op;
1516         u8 sub;
1517
1518         if (skb_linearize(skb))
1519                 goto drop;
1520         if (skb->len < sizeof(*fiph))
1521                 goto drop;
1522         eh = eth_hdr(skb);
1523         if (fip->mode == FIP_MODE_VN2VN) {
1524                 if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
1525                     !ether_addr_equal(eh->h_dest, fcoe_all_vn2vn) &&
1526                     !ether_addr_equal(eh->h_dest, fcoe_all_p2p))
1527                         goto drop;
1528         } else if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
1529                    !ether_addr_equal(eh->h_dest, fcoe_all_enode))
1530                 goto drop;
1531         fiph = (struct fip_header *)skb->data;
1532         op = ntohs(fiph->fip_op);
1533         sub = fiph->fip_subcode;
1534
1535         if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
1536                 goto drop;
1537         if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
1538                 goto drop;
1539
1540         mutex_lock(&fip->ctlr_mutex);
1541         state = fip->state;
1542         if (state == FIP_ST_AUTO) {
1543                 fip->map_dest = 0;
1544                 fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
1545                 state = FIP_ST_ENABLED;
1546                 LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
1547         }
1548         mutex_unlock(&fip->ctlr_mutex);
1549
1550         if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
1551                 return fcoe_ctlr_vn_recv(fip, skb);
1552
1553         if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
1554             state != FIP_ST_VNMP_CLAIM)
1555                 goto drop;
1556
1557         if (op == FIP_OP_LS) {
1558                 fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
1559                 return 0;
1560         }
1561
1562         if (state != FIP_ST_ENABLED)
1563                 goto drop;
1564
1565         if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
1566                 fcoe_ctlr_recv_adv(fip, skb);
1567         else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
1568                 fcoe_ctlr_recv_clr_vlink(fip, fiph);
1569         kfree_skb(skb);
1570         return 0;
1571 drop:
1572         kfree_skb(skb);
1573         return -1;
1574 }
1575
1576 /**
1577  * fcoe_ctlr_select() - Select the best FCF (if possible)
1578  * @fip: The FCoE controller
1579  *
1580  * Returns the selected FCF, or NULL if none are usable.
1581  *
1582  * If there are conflicting advertisements, no FCF can be chosen.
1583  *
1584  * If there is already a selected FCF, this will choose a better one or
1585  * an equivalent one that hasn't already been sent a FLOGI.
1586  *
1587  * Called with lock held.
1588  */
1589 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
1590 {
1591         struct fcoe_fcf *fcf;
1592         struct fcoe_fcf *best = fip->sel_fcf;
1593
1594         list_for_each_entry(fcf, &fip->fcfs, list) {
1595                 LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
1596                                 "VFID %d mac %pM map %x val %d "
1597                                 "sent %u pri %u\n",
1598                                 fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
1599                                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
1600                                 fcf->flogi_sent, fcf->pri);
1601                 if (!fcoe_ctlr_fcf_usable(fcf)) {
1602                         LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
1603                                         "map %x %svalid %savailable\n",
1604                                         fcf->fabric_name, fcf->fc_map,
1605                                         (fcf->flags & FIP_FL_SOL) ? "" : "in",
1606                                         (fcf->flags & FIP_FL_AVAIL) ?
1607                                         "" : "un");
1608                         continue;
1609                 }
1610                 if (!best || fcf->pri < best->pri || best->flogi_sent)
1611                         best = fcf;
1612                 if (fcf->fabric_name != best->fabric_name ||
1613                     fcf->vfid != best->vfid ||
1614                     fcf->fc_map != best->fc_map) {
1615                         LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
1616                                         "or FC-MAP\n");
1617                         return NULL;
1618                 }
1619         }
1620         fip->sel_fcf = best;
1621         if (best) {
1622                 LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
1623                 fip->port_ka_time = jiffies +
1624                         msecs_to_jiffies(FIP_VN_KA_PERIOD);
1625                 fip->ctlr_ka_time = jiffies + best->fka_period;
1626                 if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1627                         mod_timer(&fip->timer, fip->ctlr_ka_time);
1628         }
1629         return best;
1630 }
1631
1632 /**
1633  * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
1634  * @fip: The FCoE controller
1635  *
1636  * Returns non-zero error if it could not be sent.
1637  *
1638  * Called with ctlr_mutex and ctlr_lock held.
1639  * Caller must verify that fip->sel_fcf is not NULL.
1640  */
1641 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
1642 {
1643         struct sk_buff *skb;
1644         struct sk_buff *skb_orig;
1645         struct fc_frame_header *fh;
1646         int error;
1647
1648         skb_orig = fip->flogi_req;
1649         if (!skb_orig)
1650                 return -EINVAL;
1651
1652         /*
1653          * Clone and send the FLOGI request.  If clone fails, use original.
1654          */
1655         skb = skb_clone(skb_orig, GFP_ATOMIC);
1656         if (!skb) {
1657                 skb = skb_orig;
1658                 fip->flogi_req = NULL;
1659         }
1660         fh = (struct fc_frame_header *)skb->data;
1661         error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
1662                                  ntoh24(fh->fh_d_id));
1663         if (error) {
1664                 kfree_skb(skb);
1665                 return error;
1666         }
1667         fip->send(fip, skb);
1668         fip->sel_fcf->flogi_sent = 1;
1669         return 0;
1670 }
1671
1672 /**
1673  * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
1674  * @fip: The FCoE controller
1675  *
1676  * Returns non-zero error code if there's no FLOGI request to retry or
1677  * no alternate FCF available.
1678  */
1679 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
1680 {
1681         struct fcoe_fcf *fcf;
1682         int error;
1683
1684         mutex_lock(&fip->ctlr_mutex);
1685         spin_lock_bh(&fip->ctlr_lock);
1686         LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
1687         fcf = fcoe_ctlr_select(fip);
1688         if (!fcf || fcf->flogi_sent) {
1689                 kfree_skb(fip->flogi_req);
1690                 fip->flogi_req = NULL;
1691                 error = -ENOENT;
1692         } else {
1693                 fcoe_ctlr_solicit(fip, NULL);
1694                 error = fcoe_ctlr_flogi_send_locked(fip);
1695         }
1696         spin_unlock_bh(&fip->ctlr_lock);
1697         mutex_unlock(&fip->ctlr_mutex);
1698         return error;
1699 }
1700
1701
1702 /**
1703  * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
1704  * @fip: The FCoE controller that timed out
1705  *
1706  * Done here because fcoe_ctlr_els_send() can't get mutex.
1707  *
1708  * Called with ctlr_mutex held.  The caller must not hold ctlr_lock.
1709  */
1710 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
1711 {
1712         struct fcoe_fcf *fcf;
1713
1714         spin_lock_bh(&fip->ctlr_lock);
1715         fcf = fip->sel_fcf;
1716         if (!fcf || !fip->flogi_req_send)
1717                 goto unlock;
1718
1719         LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
1720
1721         /*
1722          * If this FLOGI is being sent due to a timeout retry
1723          * to the same FCF as before, select a different FCF if possible.
1724          */
1725         if (fcf->flogi_sent) {
1726                 LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
1727                 fcf = fcoe_ctlr_select(fip);
1728                 if (!fcf || fcf->flogi_sent) {
1729                         LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
1730                         list_for_each_entry(fcf, &fip->fcfs, list)
1731                                 fcf->flogi_sent = 0;
1732                         fcf = fcoe_ctlr_select(fip);
1733                 }
1734         }
1735         if (fcf) {
1736                 fcoe_ctlr_flogi_send_locked(fip);
1737                 fip->flogi_req_send = 0;
1738         } else /* XXX */
1739                 LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
1740 unlock:
1741         spin_unlock_bh(&fip->ctlr_lock);
1742 }
1743
1744 /**
1745  * fcoe_ctlr_timeout() - FIP timeout handler
1746  * @arg: The FCoE controller that timed out
1747  */
1748 static void fcoe_ctlr_timeout(unsigned long arg)
1749 {
1750         struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
1751
1752         schedule_work(&fip->timer_work);
1753 }
1754
1755 /**
1756  * fcoe_ctlr_timer_work() - Worker thread function for timer work
1757  * @work: Handle to a FCoE controller
1758  *
1759  * Ages FCFs.  Triggers FCF selection if possible.
1760  * Sends keep-alives and resets.
1761  */
1762 static void fcoe_ctlr_timer_work(struct work_struct *work)
1763 {
1764         struct fcoe_ctlr *fip;
1765         struct fc_lport *vport;
1766         u8 *mac;
1767         u8 reset = 0;
1768         u8 send_ctlr_ka = 0;
1769         u8 send_port_ka = 0;
1770         struct fcoe_fcf *sel;
1771         struct fcoe_fcf *fcf;
1772         unsigned long next_timer;
1773
1774         fip = container_of(work, struct fcoe_ctlr, timer_work);
1775         if (fip->mode == FIP_MODE_VN2VN)
1776                 return fcoe_ctlr_vn_timeout(fip);
1777         mutex_lock(&fip->ctlr_mutex);
1778         if (fip->state == FIP_ST_DISABLED) {
1779                 mutex_unlock(&fip->ctlr_mutex);
1780                 return;
1781         }
1782
1783         fcf = fip->sel_fcf;
1784         next_timer = fcoe_ctlr_age_fcfs(fip);
1785
1786         sel = fip->sel_fcf;
1787         if (!sel && fip->sel_time) {
1788                 if (time_after_eq(jiffies, fip->sel_time)) {
1789                         sel = fcoe_ctlr_select(fip);
1790                         fip->sel_time = 0;
1791                 } else if (time_after(next_timer, fip->sel_time))
1792                         next_timer = fip->sel_time;
1793         }
1794
1795         if (sel && fip->flogi_req_send)
1796                 fcoe_ctlr_flogi_send(fip);
1797         else if (!sel && fcf)
1798                 reset = 1;
1799
1800         if (sel && !sel->fd_flags) {
1801                 if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
1802                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1803                         send_ctlr_ka = 1;
1804                 }
1805                 if (time_after(next_timer, fip->ctlr_ka_time))
1806                         next_timer = fip->ctlr_ka_time;
1807
1808                 if (time_after_eq(jiffies, fip->port_ka_time)) {
1809                         fip->port_ka_time = jiffies +
1810                                 msecs_to_jiffies(FIP_VN_KA_PERIOD);
1811                         send_port_ka = 1;
1812                 }
1813                 if (time_after(next_timer, fip->port_ka_time))
1814                         next_timer = fip->port_ka_time;
1815         }
1816         if (!list_empty(&fip->fcfs))
1817                 mod_timer(&fip->timer, next_timer);
1818         mutex_unlock(&fip->ctlr_mutex);
1819
1820         if (reset) {
1821                 fc_lport_reset(fip->lp);
1822                 /* restart things with a solicitation */
1823                 fcoe_ctlr_solicit(fip, NULL);
1824         }
1825
1826         if (send_ctlr_ka)
1827                 fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
1828
1829         if (send_port_ka) {
1830                 mutex_lock(&fip->lp->lp_mutex);
1831                 mac = fip->get_src_addr(fip->lp);
1832                 fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
1833                 list_for_each_entry(vport, &fip->lp->vports, list) {
1834                         mac = fip->get_src_addr(vport);
1835                         fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
1836                 }
1837                 mutex_unlock(&fip->lp->lp_mutex);
1838         }
1839 }
1840
1841 /**
1842  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
1843  * @recv_work: Handle to a FCoE controller
1844  */
1845 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
1846 {
1847         struct fcoe_ctlr *fip;
1848         struct sk_buff *skb;
1849
1850         fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1851         while ((skb = skb_dequeue(&fip->fip_recv_list)))
1852                 fcoe_ctlr_recv_handler(fip, skb);
1853 }
1854
1855 /**
1856  * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
1857  * @fip: The FCoE controller
1858  * @fp:  The FC frame to snoop
1859  *
1860  * Snoop potential response to FLOGI or even incoming FLOGI.
1861  *
1862  * The caller has checked that we are waiting for login as indicated
1863  * by fip->flogi_oxid != FC_XID_UNKNOWN.
1864  *
1865  * The caller is responsible for freeing the frame.
1866  * Fill in the granted_mac address.
1867  *
1868  * Return non-zero if the frame should not be delivered to libfc.
1869  */
1870 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
1871                          struct fc_frame *fp)
1872 {
1873         struct fc_frame_header *fh;
1874         u8 op;
1875         u8 *sa;
1876
1877         sa = eth_hdr(&fp->skb)->h_source;
1878         fh = fc_frame_header_get(fp);
1879         if (fh->fh_type != FC_TYPE_ELS)
1880                 return 0;
1881
1882         op = fc_frame_payload_op(fp);
1883         if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
1884             fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1885
1886                 mutex_lock(&fip->ctlr_mutex);
1887                 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
1888                         mutex_unlock(&fip->ctlr_mutex);
1889                         return -EINVAL;
1890                 }
1891                 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1892                 LIBFCOE_FIP_DBG(fip,
1893                                 "received FLOGI LS_ACC using non-FIP mode\n");
1894
1895                 /*
1896                  * FLOGI accepted.
1897                  * If the src mac addr is FC_OUI-based, then we mark the
1898                  * address_mode flag to use FC_OUI-based Ethernet DA.
1899                  * Otherwise we use the FCoE gateway addr
1900                  */
1901                 if (ether_addr_equal(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
1902                         fcoe_ctlr_map_dest(fip);
1903                 } else {
1904                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1905                         fip->map_dest = 0;
1906                 }
1907                 fip->flogi_oxid = FC_XID_UNKNOWN;
1908                 mutex_unlock(&fip->ctlr_mutex);
1909                 fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
1910         } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
1911                 /*
1912                  * Save source MAC for point-to-point responses.
1913                  */
1914                 mutex_lock(&fip->ctlr_mutex);
1915                 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
1916                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1917                         fip->map_dest = 0;
1918                         if (fip->state == FIP_ST_AUTO)
1919                                 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
1920                                                 "Setting non-FIP mode\n");
1921                         fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1922                 }
1923                 mutex_unlock(&fip->ctlr_mutex);
1924         }
1925         return 0;
1926 }
1927 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
1928
1929 /**
1930  * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
1931  * @mac:    The MAC address to convert
1932  * @scheme: The scheme to use when converting
1933  * @port:   The port indicator for converting
1934  *
1935  * Returns: u64 fc world wide name
1936  */
1937 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1938                       unsigned int scheme, unsigned int port)
1939 {
1940         u64 wwn;
1941         u64 host_mac;
1942
1943         /* The MAC is in NO, so flip only the low 48 bits */
1944         host_mac = ((u64) mac[0] << 40) |
1945                 ((u64) mac[1] << 32) |
1946                 ((u64) mac[2] << 24) |
1947                 ((u64) mac[3] << 16) |
1948                 ((u64) mac[4] << 8) |
1949                 (u64) mac[5];
1950
1951         WARN_ON(host_mac >= (1ULL << 48));
1952         wwn = host_mac | ((u64) scheme << 60);
1953         switch (scheme) {
1954         case 1:
1955                 WARN_ON(port != 0);
1956                 break;
1957         case 2:
1958                 WARN_ON(port >= 0xfff);
1959                 wwn |= (u64) port << 48;
1960                 break;
1961         default:
1962                 WARN_ON(1);
1963                 break;
1964         }
1965
1966         return wwn;
1967 }
1968 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1969
1970 /**
1971  * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
1972  * @rdata: libfc remote port
1973  */
1974 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
1975 {
1976         return (struct fcoe_rport *)(rdata + 1);
1977 }
1978
1979 /**
1980  * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
1981  * @fip: The FCoE controller
1982  * @sub: sub-opcode for probe request, reply, or advertisement.
1983  * @dest: The destination Ethernet MAC address
1984  * @min_len: minimum size of the Ethernet payload to be sent
1985  */
1986 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
1987                               enum fip_vn2vn_subcode sub,
1988                               const u8 *dest, size_t min_len)
1989 {
1990         struct sk_buff *skb;
1991         struct fip_frame {
1992                 struct ethhdr eth;
1993                 struct fip_header fip;
1994                 struct fip_mac_desc mac;
1995                 struct fip_wwn_desc wwnn;
1996                 struct fip_vn_desc vn;
1997         } __packed * frame;
1998         struct fip_fc4_feat *ff;
1999         struct fip_size_desc *size;
2000         u32 fcp_feat;
2001         size_t len;
2002         size_t dlen;
2003
2004         len = sizeof(*frame);
2005         dlen = 0;
2006         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
2007                 dlen = sizeof(struct fip_fc4_feat) +
2008                        sizeof(struct fip_size_desc);
2009                 len += dlen;
2010         }
2011         dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
2012         len = max(len, min_len + sizeof(struct ethhdr));
2013
2014         skb = dev_alloc_skb(len);
2015         if (!skb)
2016                 return;
2017
2018         frame = (struct fip_frame *)skb->data;
2019         memset(frame, 0, len);
2020         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
2021
2022         if (sub == FIP_SC_VN_BEACON) {
2023                 hton24(frame->eth.h_source, FIP_VN_FC_MAP);
2024                 hton24(frame->eth.h_source + 3, fip->port_id);
2025         } else {
2026                 memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
2027         }
2028         frame->eth.h_proto = htons(ETH_P_FIP);
2029
2030         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
2031         frame->fip.fip_op = htons(FIP_OP_VN2VN);
2032         frame->fip.fip_subcode = sub;
2033         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
2034
2035         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
2036         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
2037         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
2038
2039         frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
2040         frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
2041         put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
2042
2043         frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
2044         frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
2045         hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
2046         hton24(frame->vn.fd_mac + 3, fip->port_id);
2047         hton24(frame->vn.fd_fc_id, fip->port_id);
2048         put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
2049
2050         /*
2051          * For claims, add FC-4 features.
2052          * TBD: Add interface to get fc-4 types and features from libfc.
2053          */
2054         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
2055                 ff = (struct fip_fc4_feat *)(frame + 1);
2056                 ff->fd_desc.fip_dtype = FIP_DT_FC4F;
2057                 ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
2058                 ff->fd_fts = fip->lp->fcts;
2059
2060                 fcp_feat = 0;
2061                 if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
2062                         fcp_feat |= FCP_FEAT_INIT;
2063                 if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
2064                         fcp_feat |= FCP_FEAT_TARG;
2065                 fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
2066                 ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
2067
2068                 size = (struct fip_size_desc *)(ff + 1);
2069                 size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
2070                 size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
2071                 size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
2072         }
2073
2074         skb_put(skb, len);
2075         skb->protocol = htons(ETH_P_FIP);
2076         skb->priority = fip->priority;
2077         skb_reset_mac_header(skb);
2078         skb_reset_network_header(skb);
2079
2080         fip->send(fip, skb);
2081 }
2082
2083 /**
2084  * fcoe_ctlr_vn_rport_callback - Event handler for rport events.
2085  * @lport: The lport which is receiving the event
2086  * @rdata: remote port private data
2087  * @event: The event that occurred
2088  *
2089  * Locking Note:  The rport lock must not be held when calling this function.
2090  */
2091 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
2092                                         struct fc_rport_priv *rdata,
2093                                         enum fc_rport_event event)
2094 {
2095         struct fcoe_ctlr *fip = lport->disc.priv;
2096         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2097
2098         LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
2099                         rdata->ids.port_id, event);
2100
2101         mutex_lock(&fip->ctlr_mutex);
2102         switch (event) {
2103         case RPORT_EV_READY:
2104                 frport->login_count = 0;
2105                 break;
2106         case RPORT_EV_LOGO:
2107         case RPORT_EV_FAILED:
2108         case RPORT_EV_STOP:
2109                 frport->login_count++;
2110                 if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
2111                         LIBFCOE_FIP_DBG(fip,
2112                                         "rport FLOGI limited port_id %6.6x\n",
2113                                         rdata->ids.port_id);
2114                         lport->tt.rport_logoff(rdata);
2115                 }
2116                 break;
2117         default:
2118                 break;
2119         }
2120         mutex_unlock(&fip->ctlr_mutex);
2121 }
2122
2123 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
2124         .event_callback = fcoe_ctlr_vn_rport_callback,
2125 };
2126
2127 /**
2128  * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
2129  * @fip: The FCoE controller
2130  *
2131  * Called with ctlr_mutex held.
2132  */
2133 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
2134 {
2135         struct fc_rport_priv *rdata;
2136
2137         mutex_lock(&lport->disc.disc_mutex);
2138         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers)
2139                 lport->tt.rport_logoff(rdata);
2140         lport->disc.disc_callback = NULL;
2141         mutex_unlock(&lport->disc.disc_mutex);
2142 }
2143
2144 /**
2145  * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
2146  * @fip: The FCoE controller
2147  *
2148  * Called through the local port template for discovery.
2149  * Called without the ctlr_mutex held.
2150  */
2151 static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
2152 {
2153         struct fcoe_ctlr *fip = lport->disc.priv;
2154
2155         mutex_lock(&fip->ctlr_mutex);
2156         fcoe_ctlr_disc_stop_locked(lport);
2157         mutex_unlock(&fip->ctlr_mutex);
2158 }
2159
2160 /**
2161  * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
2162  * @fip: The FCoE controller
2163  *
2164  * Called through the local port template for discovery.
2165  * Called without the ctlr_mutex held.
2166  */
2167 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
2168 {
2169         fcoe_ctlr_disc_stop(lport);
2170         lport->tt.rport_flush_queue();
2171         synchronize_rcu();
2172 }
2173
2174 /**
2175  * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
2176  * @fip: The FCoE controller
2177  *
2178  * Called with fcoe_ctlr lock held.
2179  */
2180 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
2181 {
2182         unsigned long wait;
2183         u32 port_id;
2184
2185         fcoe_ctlr_disc_stop_locked(fip->lp);
2186
2187         /*
2188          * Get proposed port ID.
2189          * If this is the first try after link up, use any previous port_id.
2190          * If there was none, use the low bits of the port_name.
2191          * On subsequent tries, get the next random one.
2192          * Don't use reserved IDs, use another non-zero value, just as random.
2193          */
2194         port_id = fip->port_id;
2195         if (fip->probe_tries)
2196                 port_id = prandom_u32_state(&fip->rnd_state) & 0xffff;
2197         else if (!port_id)
2198                 port_id = fip->lp->wwpn & 0xffff;
2199         if (!port_id || port_id == 0xffff)
2200                 port_id = 1;
2201         fip->port_id = port_id;
2202
2203         if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
2204                 fip->probe_tries++;
2205                 wait = prandom_u32() % FIP_VN_PROBE_WAIT;
2206         } else
2207                 wait = FIP_VN_RLIM_INT;
2208         mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
2209         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
2210 }
2211
2212 /**
2213  * fcoe_ctlr_vn_start() - Start in VN2VN mode
2214  * @fip: The FCoE controller
2215  *
2216  * Called with fcoe_ctlr lock held.
2217  */
2218 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
2219 {
2220         fip->probe_tries = 0;
2221         prandom_seed_state(&fip->rnd_state, fip->lp->wwpn);
2222         fcoe_ctlr_vn_restart(fip);
2223 }
2224
2225 /**
2226  * fcoe_ctlr_vn_parse - parse probe request or response
2227  * @fip: The FCoE controller
2228  * @skb: incoming packet
2229  * @rdata: buffer for resulting parsed VN entry plus fcoe_rport
2230  *
2231  * Returns non-zero error number on error.
2232  * Does not consume the packet.
2233  */
2234 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
2235                               struct sk_buff *skb,
2236                               struct fc_rport_priv *rdata)
2237 {
2238         struct fip_header *fiph;
2239         struct fip_desc *desc = NULL;
2240         struct fip_mac_desc *macd = NULL;
2241         struct fip_wwn_desc *wwn = NULL;
2242         struct fip_vn_desc *vn = NULL;
2243         struct fip_size_desc *size = NULL;
2244         struct fcoe_rport *frport;
2245         size_t rlen;
2246         size_t dlen;
2247         u32 desc_mask = 0;
2248         u32 dtype;
2249         u8 sub;
2250
2251         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2252         frport = fcoe_ctlr_rport(rdata);
2253
2254         fiph = (struct fip_header *)skb->data;
2255         frport->flags = ntohs(fiph->fip_flags);
2256
2257         sub = fiph->fip_subcode;
2258         switch (sub) {
2259         case FIP_SC_VN_PROBE_REQ:
2260         case FIP_SC_VN_PROBE_REP:
2261         case FIP_SC_VN_BEACON:
2262                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2263                             BIT(FIP_DT_VN_ID);
2264                 break;
2265         case FIP_SC_VN_CLAIM_NOTIFY:
2266         case FIP_SC_VN_CLAIM_REP:
2267                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2268                             BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
2269                             BIT(FIP_DT_FCOE_SIZE);
2270                 break;
2271         default:
2272                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2273                 return -EINVAL;
2274         }
2275
2276         rlen = ntohs(fiph->fip_dl_len) * 4;
2277         if (rlen + sizeof(*fiph) > skb->len)
2278                 return -EINVAL;
2279
2280         desc = (struct fip_desc *)(fiph + 1);
2281         while (rlen > 0) {
2282                 dlen = desc->fip_dlen * FIP_BPW;
2283                 if (dlen < sizeof(*desc) || dlen > rlen)
2284                         return -EINVAL;
2285
2286                 dtype = desc->fip_dtype;
2287                 if (dtype < 32) {
2288                         if (!(desc_mask & BIT(dtype))) {
2289                                 LIBFCOE_FIP_DBG(fip,
2290                                                 "unexpected or duplicated desc "
2291                                                 "desc type %u in "
2292                                                 "FIP VN2VN subtype %u\n",
2293                                                 dtype, sub);
2294                                 return -EINVAL;
2295                         }
2296                         desc_mask &= ~BIT(dtype);
2297                 }
2298
2299                 switch (dtype) {
2300                 case FIP_DT_MAC:
2301                         if (dlen != sizeof(struct fip_mac_desc))
2302                                 goto len_err;
2303                         macd = (struct fip_mac_desc *)desc;
2304                         if (!is_valid_ether_addr(macd->fd_mac)) {
2305                                 LIBFCOE_FIP_DBG(fip,
2306                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2307                                          macd->fd_mac);
2308                                 return -EINVAL;
2309                         }
2310                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2311                         break;
2312                 case FIP_DT_NAME:
2313                         if (dlen != sizeof(struct fip_wwn_desc))
2314                                 goto len_err;
2315                         wwn = (struct fip_wwn_desc *)desc;
2316                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2317                         break;
2318                 case FIP_DT_VN_ID:
2319                         if (dlen != sizeof(struct fip_vn_desc))
2320                                 goto len_err;
2321                         vn = (struct fip_vn_desc *)desc;
2322                         memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
2323                         rdata->ids.port_id = ntoh24(vn->fd_fc_id);
2324                         rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn);
2325                         break;
2326                 case FIP_DT_FC4F:
2327                         if (dlen != sizeof(struct fip_fc4_feat))
2328                                 goto len_err;
2329                         break;
2330                 case FIP_DT_FCOE_SIZE:
2331                         if (dlen != sizeof(struct fip_size_desc))
2332                                 goto len_err;
2333                         size = (struct fip_size_desc *)desc;
2334                         frport->fcoe_len = ntohs(size->fd_size);
2335                         break;
2336                 default:
2337                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2338                                         "in FIP probe\n", dtype);
2339                         /* standard says ignore unknown descriptors >= 128 */
2340                         if (dtype < FIP_DT_VENDOR_BASE)
2341                                 return -EINVAL;
2342                         break;
2343                 }
2344                 desc = (struct fip_desc *)((char *)desc + dlen);
2345                 rlen -= dlen;
2346         }
2347         return 0;
2348
2349 len_err:
2350         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2351                         dtype, dlen);
2352         return -EINVAL;
2353 }
2354
2355 /**
2356  * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
2357  * @fip: The FCoE controller
2358  *
2359  * Called with ctlr_mutex held.
2360  */
2361 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
2362 {
2363         fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
2364         fip->sol_time = jiffies;
2365 }
2366
2367 /**
2368  * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
2369  * @fip: The FCoE controller
2370  * @rdata: parsed remote port with frport from the probe request
2371  *
2372  * Called with ctlr_mutex held.
2373  */
2374 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
2375                                    struct fc_rport_priv *rdata)
2376 {
2377         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2378
2379         if (rdata->ids.port_id != fip->port_id)
2380                 return;
2381
2382         switch (fip->state) {
2383         case FIP_ST_VNMP_CLAIM:
2384         case FIP_ST_VNMP_UP:
2385                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2386                                   frport->enode_mac, 0);
2387                 break;
2388         case FIP_ST_VNMP_PROBE1:
2389         case FIP_ST_VNMP_PROBE2:
2390                 /*
2391                  * Decide whether to reply to the Probe.
2392                  * Our selected address is never a "recorded" one, so
2393                  * only reply if our WWPN is greater and the
2394                  * Probe's REC bit is not set.
2395                  * If we don't reply, we will change our address.
2396                  */
2397                 if (fip->lp->wwpn > rdata->ids.port_name &&
2398                     !(frport->flags & FIP_FL_REC_OR_P2P)) {
2399                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2400                                           frport->enode_mac, 0);
2401                         break;
2402                 }
2403                 /* fall through */
2404         case FIP_ST_VNMP_START:
2405                 fcoe_ctlr_vn_restart(fip);
2406                 break;
2407         default:
2408                 break;
2409         }
2410 }
2411
2412 /**
2413  * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
2414  * @fip: The FCoE controller
2415  * @rdata: parsed remote port with frport from the probe request
2416  *
2417  * Called with ctlr_mutex held.
2418  */
2419 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
2420                                    struct fc_rport_priv *rdata)
2421 {
2422         if (rdata->ids.port_id != fip->port_id)
2423                 return;
2424         switch (fip->state) {
2425         case FIP_ST_VNMP_START:
2426         case FIP_ST_VNMP_PROBE1:
2427         case FIP_ST_VNMP_PROBE2:
2428         case FIP_ST_VNMP_CLAIM:
2429                 fcoe_ctlr_vn_restart(fip);
2430                 break;
2431         case FIP_ST_VNMP_UP:
2432                 fcoe_ctlr_vn_send_claim(fip);
2433                 break;
2434         default:
2435                 break;
2436         }
2437 }
2438
2439 /**
2440  * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
2441  * @fip: The FCoE controller
2442  * @new: newly-parsed remote port with frport as a template for new rdata
2443  *
2444  * Called with ctlr_mutex held.
2445  */
2446 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new)
2447 {
2448         struct fc_lport *lport = fip->lp;
2449         struct fc_rport_priv *rdata;
2450         struct fc_rport_identifiers *ids;
2451         struct fcoe_rport *frport;
2452         u32 port_id;
2453
2454         port_id = new->ids.port_id;
2455         if (port_id == fip->port_id)
2456                 return;
2457
2458         mutex_lock(&lport->disc.disc_mutex);
2459         rdata = lport->tt.rport_create(lport, port_id);
2460         if (!rdata) {
2461                 mutex_unlock(&lport->disc.disc_mutex);
2462                 return;
2463         }
2464
2465         rdata->ops = &fcoe_ctlr_vn_rport_ops;
2466         rdata->disc_id = lport->disc.disc_id;
2467
2468         ids = &rdata->ids;
2469         if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) ||
2470             (ids->node_name != -1 && ids->node_name != new->ids.node_name))
2471                 lport->tt.rport_logoff(rdata);
2472         ids->port_name = new->ids.port_name;
2473         ids->node_name = new->ids.node_name;
2474         mutex_unlock(&lport->disc.disc_mutex);
2475
2476         frport = fcoe_ctlr_rport(rdata);
2477         LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s\n",
2478                         port_id, frport->fcoe_len ? "old" : "new");
2479         *frport = *fcoe_ctlr_rport(new);
2480         frport->time = 0;
2481 }
2482
2483 /**
2484  * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
2485  * @fip: The FCoE controller
2486  * @port_id:  The port_id of the remote VN_node
2487  * @mac: buffer which will hold the VN_NODE destination MAC address, if found.
2488  *
2489  * Returns non-zero error if no remote port found.
2490  */
2491 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
2492 {
2493         struct fc_lport *lport = fip->lp;
2494         struct fc_rport_priv *rdata;
2495         struct fcoe_rport *frport;
2496         int ret = -1;
2497
2498         rcu_read_lock();
2499         rdata = lport->tt.rport_lookup(lport, port_id);
2500         if (rdata) {
2501                 frport = fcoe_ctlr_rport(rdata);
2502                 memcpy(mac, frport->enode_mac, ETH_ALEN);
2503                 ret = 0;
2504         }
2505         rcu_read_unlock();
2506         return ret;
2507 }
2508
2509 /**
2510  * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
2511  * @fip: The FCoE controller
2512  * @new: newly-parsed remote port with frport as a template for new rdata
2513  *
2514  * Called with ctlr_mutex held.
2515  */
2516 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
2517                                       struct fc_rport_priv *new)
2518 {
2519         struct fcoe_rport *frport = fcoe_ctlr_rport(new);
2520
2521         if (frport->flags & FIP_FL_REC_OR_P2P) {
2522                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2523                 return;
2524         }
2525         switch (fip->state) {
2526         case FIP_ST_VNMP_START:
2527         case FIP_ST_VNMP_PROBE1:
2528         case FIP_ST_VNMP_PROBE2:
2529                 if (new->ids.port_id == fip->port_id)
2530                         fcoe_ctlr_vn_restart(fip);
2531                 break;
2532         case FIP_ST_VNMP_CLAIM:
2533         case FIP_ST_VNMP_UP:
2534                 if (new->ids.port_id == fip->port_id) {
2535                         if (new->ids.port_name > fip->lp->wwpn) {
2536                                 fcoe_ctlr_vn_restart(fip);
2537                                 break;
2538                         }
2539                         fcoe_ctlr_vn_send_claim(fip);
2540                         break;
2541                 }
2542                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac,
2543                                   min((u32)frport->fcoe_len,
2544                                       fcoe_ctlr_fcoe_size(fip)));
2545                 fcoe_ctlr_vn_add(fip, new);
2546                 break;
2547         default:
2548                 break;
2549         }
2550 }
2551
2552 /**
2553  * fcoe_ctlr_vn_claim_resp() - handle received Claim Response
2554  * @fip: The FCoE controller that received the frame
2555  * @new: newly-parsed remote port with frport from the Claim Response
2556  *
2557  * Called with ctlr_mutex held.
2558  */
2559 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
2560                                     struct fc_rport_priv *new)
2561 {
2562         LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
2563                         new->ids.port_id, fcoe_ctlr_state(fip->state));
2564         if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
2565                 fcoe_ctlr_vn_add(fip, new);
2566 }
2567
2568 /**
2569  * fcoe_ctlr_vn_beacon() - handle received beacon.
2570  * @fip: The FCoE controller that received the frame
2571  * @new: newly-parsed remote port with frport from the Beacon
2572  *
2573  * Called with ctlr_mutex held.
2574  */
2575 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
2576                                 struct fc_rport_priv *new)
2577 {
2578         struct fc_lport *lport = fip->lp;
2579         struct fc_rport_priv *rdata;
2580         struct fcoe_rport *frport;
2581
2582         frport = fcoe_ctlr_rport(new);
2583         if (frport->flags & FIP_FL_REC_OR_P2P) {
2584                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2585                 return;
2586         }
2587         mutex_lock(&lport->disc.disc_mutex);
2588         rdata = lport->tt.rport_lookup(lport, new->ids.port_id);
2589         if (rdata)
2590                 kref_get(&rdata->kref);
2591         mutex_unlock(&lport->disc.disc_mutex);
2592         if (rdata) {
2593                 if (rdata->ids.node_name == new->ids.node_name &&
2594                     rdata->ids.port_name == new->ids.port_name) {
2595                         frport = fcoe_ctlr_rport(rdata);
2596                         if (!frport->time && fip->state == FIP_ST_VNMP_UP)
2597                                 lport->tt.rport_login(rdata);
2598                         frport->time = jiffies;
2599                 }
2600                 kref_put(&rdata->kref, lport->tt.rport_destroy);
2601                 return;
2602         }
2603         if (fip->state != FIP_ST_VNMP_UP)
2604                 return;
2605
2606         /*
2607          * Beacon from a new neighbor.
2608          * Send a claim notify if one hasn't been sent recently.
2609          * Don't add the neighbor yet.
2610          */
2611         LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
2612                         new->ids.port_id);
2613         if (time_after(jiffies,
2614                        fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
2615                 fcoe_ctlr_vn_send_claim(fip);
2616 }
2617
2618 /**
2619  * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
2620  * @fip: The FCoE controller
2621  *
2622  * Called with ctlr_mutex held.
2623  * Called only in state FIP_ST_VNMP_UP.
2624  * Returns the soonest time for next age-out or a time far in the future.
2625  */
2626 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
2627 {
2628         struct fc_lport *lport = fip->lp;
2629         struct fc_rport_priv *rdata;
2630         struct fcoe_rport *frport;
2631         unsigned long next_time;
2632         unsigned long deadline;
2633
2634         next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
2635         mutex_lock(&lport->disc.disc_mutex);
2636         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
2637                 frport = fcoe_ctlr_rport(rdata);
2638                 if (!frport->time)
2639                         continue;
2640                 deadline = frport->time +
2641                            msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
2642                 if (time_after_eq(jiffies, deadline)) {
2643                         frport->time = 0;
2644                         LIBFCOE_FIP_DBG(fip,
2645                                 "port %16.16llx fc_id %6.6x beacon expired\n",
2646                                 rdata->ids.port_name, rdata->ids.port_id);
2647                         lport->tt.rport_logoff(rdata);
2648                 } else if (time_before(deadline, next_time))
2649                         next_time = deadline;
2650         }
2651         mutex_unlock(&lport->disc.disc_mutex);
2652         return next_time;
2653 }
2654
2655 /**
2656  * fcoe_ctlr_vn_recv() - Receive a FIP frame
2657  * @fip: The FCoE controller that received the frame
2658  * @skb: The received FIP frame
2659  *
2660  * Returns non-zero if the frame is dropped.
2661  * Always consumes the frame.
2662  */
2663 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2664 {
2665         struct fip_header *fiph;
2666         enum fip_vn2vn_subcode sub;
2667         struct {
2668                 struct fc_rport_priv rdata;
2669                 struct fcoe_rport frport;
2670         } buf;
2671         int rc;
2672
2673         fiph = (struct fip_header *)skb->data;
2674         sub = fiph->fip_subcode;
2675
2676         rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata);
2677         if (rc) {
2678                 LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
2679                 goto drop;
2680         }
2681
2682         mutex_lock(&fip->ctlr_mutex);
2683         switch (sub) {
2684         case FIP_SC_VN_PROBE_REQ:
2685                 fcoe_ctlr_vn_probe_req(fip, &buf.rdata);
2686                 break;
2687         case FIP_SC_VN_PROBE_REP:
2688                 fcoe_ctlr_vn_probe_reply(fip, &buf.rdata);
2689                 break;
2690         case FIP_SC_VN_CLAIM_NOTIFY:
2691                 fcoe_ctlr_vn_claim_notify(fip, &buf.rdata);
2692                 break;
2693         case FIP_SC_VN_CLAIM_REP:
2694                 fcoe_ctlr_vn_claim_resp(fip, &buf.rdata);
2695                 break;
2696         case FIP_SC_VN_BEACON:
2697                 fcoe_ctlr_vn_beacon(fip, &buf.rdata);
2698                 break;
2699         default:
2700                 LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
2701                 rc = -1;
2702                 break;
2703         }
2704         mutex_unlock(&fip->ctlr_mutex);
2705 drop:
2706         kfree_skb(skb);
2707         return rc;
2708 }
2709
2710 /**
2711  * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
2712  * @lport: The local port
2713  * @fp: The received frame
2714  *
2715  * This should never be called since we don't see RSCNs or other
2716  * fabric-generated ELSes.
2717  */
2718 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
2719 {
2720         struct fc_seq_els_data rjt_data;
2721
2722         rjt_data.reason = ELS_RJT_UNSUP;
2723         rjt_data.explan = ELS_EXPL_NONE;
2724         lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
2725         fc_frame_free(fp);
2726 }
2727
2728 /**
2729  * fcoe_ctlr_disc_recv - start discovery for VN2VN mode.
2730  * @fip: The FCoE controller
2731  *
2732  * This sets a flag indicating that remote ports should be created
2733  * and started for the peers we discover.  We use the disc_callback
2734  * pointer as that flag.  Peers already discovered are created here.
2735  *
2736  * The lport lock is held during this call. The callback must be done
2737  * later, without holding either the lport or discovery locks.
2738  * The fcoe_ctlr lock may also be held during this call.
2739  */
2740 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
2741                                                   enum fc_disc_event),
2742                                  struct fc_lport *lport)
2743 {
2744         struct fc_disc *disc = &lport->disc;
2745         struct fcoe_ctlr *fip = disc->priv;
2746
2747         mutex_lock(&disc->disc_mutex);
2748         disc->disc_callback = callback;
2749         disc->disc_id = (disc->disc_id + 2) | 1;
2750         disc->pending = 1;
2751         schedule_work(&fip->timer_work);
2752         mutex_unlock(&disc->disc_mutex);
2753 }
2754
2755 /**
2756  * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
2757  * @fip: The FCoE controller
2758  *
2759  * Starts the FLOGI and PLOGI login process to each discovered rport for which
2760  * we've received at least one beacon.
2761  * Performs the discovery complete callback.
2762  */
2763 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
2764 {
2765         struct fc_lport *lport = fip->lp;
2766         struct fc_disc *disc = &lport->disc;
2767         struct fc_rport_priv *rdata;
2768         struct fcoe_rport *frport;
2769         void (*callback)(struct fc_lport *, enum fc_disc_event);
2770
2771         mutex_lock(&disc->disc_mutex);
2772         callback = disc->pending ? disc->disc_callback : NULL;
2773         disc->pending = 0;
2774         list_for_each_entry_rcu(rdata, &disc->rports, peers) {
2775                 frport = fcoe_ctlr_rport(rdata);
2776                 if (frport->time)
2777                         lport->tt.rport_login(rdata);
2778         }
2779         mutex_unlock(&disc->disc_mutex);
2780         if (callback)
2781                 callback(lport, DISC_EV_SUCCESS);
2782 }
2783
2784 /**
2785  * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
2786  * @fip: The FCoE controller
2787  */
2788 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
2789 {
2790         unsigned long next_time;
2791         u8 mac[ETH_ALEN];
2792         u32 new_port_id = 0;
2793
2794         mutex_lock(&fip->ctlr_mutex);
2795         switch (fip->state) {
2796         case FIP_ST_VNMP_START:
2797                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
2798                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2799                 next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
2800                 break;
2801         case FIP_ST_VNMP_PROBE1:
2802                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
2803                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2804                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2805                 break;
2806         case FIP_ST_VNMP_PROBE2:
2807                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
2808                 new_port_id = fip->port_id;
2809                 hton24(mac, FIP_VN_FC_MAP);
2810                 hton24(mac + 3, new_port_id);
2811                 fcoe_ctlr_map_dest(fip);
2812                 fip->update_mac(fip->lp, mac);
2813                 fcoe_ctlr_vn_send_claim(fip);
2814                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2815                 break;
2816         case FIP_ST_VNMP_CLAIM:
2817                 /*
2818                  * This may be invoked either by starting discovery so don't
2819                  * go to the next state unless it's been long enough.
2820                  */
2821                 next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2822                 if (time_after_eq(jiffies, next_time)) {
2823                         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
2824                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2825                                           fcoe_all_vn2vn, 0);
2826                         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2827                         fip->port_ka_time = next_time;
2828                 }
2829                 fcoe_ctlr_vn_disc(fip);
2830                 break;
2831         case FIP_ST_VNMP_UP:
2832                 next_time = fcoe_ctlr_vn_age(fip);
2833                 if (time_after_eq(jiffies, fip->port_ka_time)) {
2834                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2835                                           fcoe_all_vn2vn, 0);
2836                         fip->port_ka_time = jiffies +
2837                                  msecs_to_jiffies(FIP_VN_BEACON_INT +
2838                                         (prandom_u32() % FIP_VN_BEACON_FUZZ));
2839                 }
2840                 if (time_before(fip->port_ka_time, next_time))
2841                         next_time = fip->port_ka_time;
2842                 break;
2843         case FIP_ST_LINK_WAIT:
2844                 goto unlock;
2845         default:
2846                 WARN(1, "unexpected state %d\n", fip->state);
2847                 goto unlock;
2848         }
2849         mod_timer(&fip->timer, next_time);
2850 unlock:
2851         mutex_unlock(&fip->ctlr_mutex);
2852
2853         /* If port ID is new, notify local port after dropping ctlr_mutex */
2854         if (new_port_id)
2855                 fc_lport_set_local_id(fip->lp, new_port_id);
2856 }
2857
2858 /**
2859  * fcoe_ctlr_mode_set() - Set or reset the ctlr's mode
2860  * @lport: The local port to be (re)configured
2861  * @fip:   The FCoE controller whose mode is changing
2862  * @fip_mode: The new fip mode
2863  *
2864  * Note that the we shouldn't be changing the libfc discovery settings
2865  * (fc_disc_config) while an lport is going through the libfc state
2866  * machine. The mode can only be changed when a fcoe_ctlr device is
2867  * disabled, so that should ensure that this routine is only called
2868  * when nothing is happening.
2869  */
2870 static void fcoe_ctlr_mode_set(struct fc_lport *lport, struct fcoe_ctlr *fip,
2871                                enum fip_state fip_mode)
2872 {
2873         void *priv;
2874
2875         WARN_ON(lport->state != LPORT_ST_RESET &&
2876                 lport->state != LPORT_ST_DISABLED);
2877
2878         if (fip_mode == FIP_MODE_VN2VN) {
2879                 lport->rport_priv_size = sizeof(struct fcoe_rport);
2880                 lport->point_to_multipoint = 1;
2881                 lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
2882                 lport->tt.disc_start = fcoe_ctlr_disc_start;
2883                 lport->tt.disc_stop = fcoe_ctlr_disc_stop;
2884                 lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
2885                 priv = fip;
2886         } else {
2887                 lport->rport_priv_size = 0;
2888                 lport->point_to_multipoint = 0;
2889                 lport->tt.disc_recv_req = NULL;
2890                 lport->tt.disc_start = NULL;
2891                 lport->tt.disc_stop = NULL;
2892                 lport->tt.disc_stop_final = NULL;
2893                 priv = lport;
2894         }
2895
2896         fc_disc_config(lport, priv);
2897 }
2898
2899 /**
2900  * fcoe_libfc_config() - Sets up libfc related properties for local port
2901  * @lport:    The local port to configure libfc for
2902  * @fip:      The FCoE controller in use by the local port
2903  * @tt:       The libfc function template
2904  * @init_fcp: If non-zero, the FCP portion of libfc should be initialized
2905  *
2906  * Returns : 0 for success
2907  */
2908 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
2909                       const struct libfc_function_template *tt, int init_fcp)
2910 {
2911         /* Set the function pointers set by the LLDD */
2912         memcpy(&lport->tt, tt, sizeof(*tt));
2913         if (init_fcp && fc_fcp_init(lport))
2914                 return -ENOMEM;
2915         fc_exch_init(lport);
2916         fc_elsct_init(lport);
2917         fc_lport_init(lport);
2918         fc_rport_init(lport);
2919         fc_disc_init(lport);
2920         fcoe_ctlr_mode_set(lport, fip, fip->mode);
2921         return 0;
2922 }
2923 EXPORT_SYMBOL_GPL(fcoe_libfc_config);
2924
2925 void fcoe_fcf_get_selected(struct fcoe_fcf_device *fcf_dev)
2926 {
2927         struct fcoe_ctlr_device *ctlr_dev = fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2928         struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
2929         struct fcoe_fcf *fcf;
2930
2931         mutex_lock(&fip->ctlr_mutex);
2932         mutex_lock(&ctlr_dev->lock);
2933
2934         fcf = fcoe_fcf_device_priv(fcf_dev);
2935         if (fcf)
2936                 fcf_dev->selected = (fcf == fip->sel_fcf) ? 1 : 0;
2937         else
2938                 fcf_dev->selected = 0;
2939
2940         mutex_unlock(&ctlr_dev->lock);
2941         mutex_unlock(&fip->ctlr_mutex);
2942 }
2943 EXPORT_SYMBOL(fcoe_fcf_get_selected);
2944
2945 void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *ctlr_dev)
2946 {
2947         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2948         struct fc_lport *lport = ctlr->lp;
2949
2950         mutex_lock(&ctlr->ctlr_mutex);
2951         switch (ctlr_dev->mode) {
2952         case FIP_CONN_TYPE_VN2VN:
2953                 ctlr->mode = FIP_MODE_VN2VN;
2954                 break;
2955         case FIP_CONN_TYPE_FABRIC:
2956         default:
2957                 ctlr->mode = FIP_MODE_FABRIC;
2958                 break;
2959         }
2960
2961         mutex_unlock(&ctlr->ctlr_mutex);
2962
2963         fcoe_ctlr_mode_set(lport, ctlr, ctlr->mode);
2964 }
2965 EXPORT_SYMBOL(fcoe_ctlr_set_fip_mode);