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 int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *, struct sk_buff *);
  63
  64 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
  65 static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS;
  66 static u8 fcoe_all_vn2vn[ETH_ALEN] = FIP_ALL_VN2VN_MACS;
  67 static u8 fcoe_all_p2p[ETH_ALEN] = FIP_ALL_P2P_MACS;
  68
  69 static const char * const fcoe_ctlr_states[] = {
  70         [FIP_ST_DISABLED] =     "DISABLED",
  71         [FIP_ST_LINK_WAIT] =    "LINK_WAIT",
  72         [FIP_ST_AUTO] =         "AUTO",
  73         [FIP_ST_NON_FIP] =      "NON_FIP",
  74         [FIP_ST_ENABLED] =      "ENABLED",
  75         [FIP_ST_VNMP_START] =   "VNMP_START",
  76         [FIP_ST_VNMP_PROBE1] =  "VNMP_PROBE1",
  77         [FIP_ST_VNMP_PROBE2] =  "VNMP_PROBE2",
  78         [FIP_ST_VNMP_CLAIM] =   "VNMP_CLAIM",
  79         [FIP_ST_VNMP_UP] =      "VNMP_UP",
  80 };
  81
  82 static const char *fcoe_ctlr_state(enum fip_state state)
  83 {
  84         const char *cp = "unknown";
  85
  86         if (state < ARRAY_SIZE(fcoe_ctlr_states))
  87                 cp = fcoe_ctlr_states[state];
  88         if (!cp)
  89                 cp = "unknown";
  90         return cp;
  91 }
  92
  93 /**
  94  * fcoe_ctlr_set_state() - Set and do debug printing for the new FIP state.
  95  * @fip: The FCoE controller
  96  * @state: The new state
  97  */
  98 static void fcoe_ctlr_set_state(struct fcoe_ctlr *fip, enum fip_state state)
  99 {
 100         if (state == fip->state)
 101                 return;
 102         if (fip->lp)
 103                 LIBFCOE_FIP_DBG(fip, "state %s -> %s\n",
 104                         fcoe_ctlr_state(fip->state), fcoe_ctlr_state(state));
 105         fip->state = state;
 106 }
 107
 108 /**
 109  * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
 110  * @fcf: The FCF to check
 111  *
 112  * Return non-zero if FCF fcoe_size has been validated.
 113  */
 114 static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
 115 {
 116         return (fcf->flags & FIP_FL_SOL) != 0;
 117 }
 118
 119 /**
 120  * fcoe_ctlr_fcf_usable() - Check if a FCF is usable
 121  * @fcf: The FCF to check
 122  *
 123  * Return non-zero if the FCF is usable.
 124  */
 125 static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
 126 {
 127         u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
 128
 129         return (fcf->flags & flags) == flags;
 130 }
 131
 132 /**
 133  * fcoe_ctlr_map_dest() - Set flag and OUI for mapping destination addresses
 134  * @fip: The FCoE controller
 135  */
 136 static void fcoe_ctlr_map_dest(struct fcoe_ctlr *fip)
 137 {
 138         if (fip->mode == FIP_MODE_VN2VN)
 139                 hton24(fip->dest_addr, FIP_VN_FC_MAP);
 140         else
 141                 hton24(fip->dest_addr, FIP_DEF_FC_MAP);
 142         hton24(fip->dest_addr + 3, 0);
 143         fip->map_dest = 1;
 144 }
 145
 146 /**
 147  * fcoe_ctlr_init() - Initialize the FCoE Controller instance
 148  * @fip: The FCoE controller to initialize
 149  */
 150 void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_state mode)
 151 {
 152         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
 153         fip->mode = mode;
 154         fip->fip_resp = false;
 155         INIT_LIST_HEAD(&fip->fcfs);
 156         mutex_init(&fip->ctlr_mutex);
 157         spin_lock_init(&fip->ctlr_lock);
 158         fip->flogi_oxid = FC_XID_UNKNOWN;
 159         setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
 160         INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
 161         INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
 162         skb_queue_head_init(&fip->fip_recv_list);
 163 }
 164 EXPORT_SYMBOL(fcoe_ctlr_init);
 165
 166 /**
 167  * fcoe_sysfs_fcf_add() - Add a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
 168  * @new: The newly discovered FCF
 169  *
 170  * Called with fip->ctlr_mutex held
 171  */
 172 static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
 173 {
 174         struct fcoe_ctlr *fip = new->fip;
 175         struct fcoe_ctlr_device *ctlr_dev;
 176         struct fcoe_fcf_device *temp, *fcf_dev;
 177         int rc = -ENOMEM;
 178
 179         LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
 180                         new->fabric_name, new->fcf_mac);
 181
 182         temp = kzalloc(sizeof(*temp), GFP_KERNEL);
 183         if (!temp)
 184                 goto out;
 185
 186         temp->fabric_name = new->fabric_name;
 187         temp->switch_name = new->switch_name;
 188         temp->fc_map = new->fc_map;
 189         temp->vfid = new->vfid;
 190         memcpy(temp->mac, new->fcf_mac, ETH_ALEN);
 191         temp->priority = new->pri;
 192         temp->fka_period = new->fka_period;
 193         temp->selected = 0; /* default to unselected */
 194
 195         /*
 196          * If ctlr_dev doesn't exist then it means we're a libfcoe user
 197          * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device.
 198          * fnic would be an example of a driver with this behavior. In this
 199          * case we want to add the fcoe_fcf to the fcoe_ctlr list, but we
 200          * don't want to make sysfs changes.
 201          */
 202
 203         ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
 204         if (ctlr_dev) {
 205                 mutex_lock(&ctlr_dev->lock);
 206                 fcf_dev = fcoe_fcf_device_add(ctlr_dev, temp);
 207                 if (unlikely(!fcf_dev)) {
 208                         rc = -ENOMEM;
 209                         mutex_unlock(&ctlr_dev->lock);
 210                         goto out;
 211                 }
 212
 213                 /*
 214                  * The fcoe_sysfs layer can return a CONNECTED fcf that
 215                  * has a priv (fcf was never deleted) or a CONNECTED fcf
 216                  * that doesn't have a priv (fcf was deleted). However,
 217                  * libfcoe will always delete FCFs before trying to add
 218                  * them. This is ensured because both recv_adv and
 219                  * age_fcfs are protected by the the fcoe_ctlr's mutex.
 220                  * This means that we should never get a FCF with a
 221                  * non-NULL priv pointer.
 222                  */
 223                 BUG_ON(fcf_dev->priv);
 224
 225                 fcf_dev->priv = new;
 226                 new->fcf_dev = fcf_dev;
 227                 mutex_unlock(&ctlr_dev->lock);
 228         }
 229
 230         list_add(&new->list, &fip->fcfs);
 231         fip->fcf_count++;
 232         rc = 0;
 233
 234 out:
 235         kfree(temp);
 236         return rc;
 237 }
 238
 239 /**
 240  * fcoe_sysfs_fcf_del() - Remove a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
 241  * @new: The FCF to be removed
 242  *
 243  * Called with fip->ctlr_mutex held
 244  */
 245 static void fcoe_sysfs_fcf_del(struct fcoe_fcf *new)
 246 {
 247         struct fcoe_ctlr *fip = new->fip;
 248         struct fcoe_ctlr_device *cdev;
 249         struct fcoe_fcf_device *fcf_dev;
 250
 251         list_del(&new->list);
 252         fip->fcf_count--;
 253
 254         /*
 255          * If ctlr_dev doesn't exist then it means we're a libfcoe user
 256          * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device
 257          * or a fcoe_fcf_device.
 258          *
 259          * fnic would be an example of a driver with this behavior. In this
 260          * case we want to remove the fcoe_fcf from the fcoe_ctlr list (above),
 261          * but we don't want to make sysfs changes.
 262          */
 263         cdev = fcoe_ctlr_to_ctlr_dev(fip);
 264         if (cdev) {
 265                 mutex_lock(&cdev->lock);
 266                 fcf_dev = fcoe_fcf_to_fcf_dev(new);
 267                 WARN_ON(!fcf_dev);
 268                 new->fcf_dev = NULL;
 269                 fcoe_fcf_device_delete(fcf_dev);
 270                 kfree(new);
 271                 mutex_unlock(&cdev->lock);
 272         }
 273 }
 274
 275 /**
 276  * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
 277  * @fip: The FCoE controller whose FCFs are to be reset
 278  *
 279  * Called with &fcoe_ctlr lock held.
 280  */
 281 static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
 282 {
 283         struct fcoe_fcf *fcf;
 284         struct fcoe_fcf *next;
 285
 286         fip->sel_fcf = NULL;
 287         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 288                 fcoe_sysfs_fcf_del(fcf);
 289         }
 290         WARN_ON(fip->fcf_count);
 291
 292         fip->sel_time = 0;
 293 }
 294
 295 /**
 296  * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
 297  * @fip: The FCoE controller to tear down
 298  *
 299  * This is called by FCoE drivers before freeing the &fcoe_ctlr.
 300  *
 301  * The receive handler will have been deleted before this to guarantee
 302  * that no more recv_work will be scheduled.
 303  *
 304  * The timer routine will simply return once we set FIP_ST_DISABLED.
 305  * This guarantees that no further timeouts or work will be scheduled.
 306  */
 307 void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
 308 {
 309         cancel_work_sync(&fip->recv_work);
 310         skb_queue_purge(&fip->fip_recv_list);
 311
 312         mutex_lock(&fip->ctlr_mutex);
 313         fcoe_ctlr_set_state(fip, FIP_ST_DISABLED);
 314         fcoe_ctlr_reset_fcfs(fip);
 315         mutex_unlock(&fip->ctlr_mutex);
 316         del_timer_sync(&fip->timer);
 317         cancel_work_sync(&fip->timer_work);
 318 }
 319 EXPORT_SYMBOL(fcoe_ctlr_destroy);
 320
 321 /**
 322  * fcoe_ctlr_announce() - announce new FCF selection
 323  * @fip: The FCoE controller
 324  *
 325  * Also sets the destination MAC for FCoE and control packets
 326  *
 327  * Called with neither ctlr_mutex nor ctlr_lock held.
 328  */
 329 static void fcoe_ctlr_announce(struct fcoe_ctlr *fip)
 330 {
 331         struct fcoe_fcf *sel;
 332         struct fcoe_fcf *fcf;
 333
 334         mutex_lock(&fip->ctlr_mutex);
 335         spin_lock_bh(&fip->ctlr_lock);
 336
 337         kfree_skb(fip->flogi_req);
 338         fip->flogi_req = NULL;
 339         list_for_each_entry(fcf, &fip->fcfs, list)
 340                 fcf->flogi_sent = 0;
 341
 342         spin_unlock_bh(&fip->ctlr_lock);
 343         sel = fip->sel_fcf;
 344
 345         if (sel && ether_addr_equal(sel->fcf_mac, fip->dest_addr))
 346                 goto unlock;
 347         if (!is_zero_ether_addr(fip->dest_addr)) {
 348                 printk(KERN_NOTICE "libfcoe: host%d: "
 349                        "FIP Fibre-Channel Forwarder MAC %pM deselected\n",
 350                        fip->lp->host->host_no, fip->dest_addr);
 351                 memset(fip->dest_addr, 0, ETH_ALEN);
 352         }
 353         if (sel) {
 354                 printk(KERN_INFO "libfcoe: host%d: FIP selected "
 355                        "Fibre-Channel Forwarder MAC %pM\n",
 356                        fip->lp->host->host_no, sel->fcf_mac);
 357                 memcpy(fip->dest_addr, sel->fcoe_mac, ETH_ALEN);
 358                 fip->map_dest = 0;
 359         }
 360 unlock:
 361         mutex_unlock(&fip->ctlr_mutex);
 362 }
 363
 364 /**
 365  * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
 366  * @fip: The FCoE controller to get the maximum FCoE size from
 367  *
 368  * Returns the maximum packet size including the FCoE header and trailer,
 369  * but not including any Ethernet or VLAN headers.
 370  */
 371 static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
 372 {
 373         /*
 374          * Determine the max FCoE frame size allowed, including
 375          * FCoE header and trailer.
 376          * Note:  lp->mfs is currently the payload size, not the frame size.
 377          */
 378         return fip->lp->mfs + sizeof(struct fc_frame_header) +
 379                 sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
 380 }
 381
 382 /**
 383  * fcoe_ctlr_solicit() - Send a FIP solicitation
 384  * @fip: The FCoE controller to send the solicitation on
 385  * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
 386  */
 387 static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
 388 {
 389         struct sk_buff *skb;
 390         struct fip_sol {
 391                 struct ethhdr eth;
 392                 struct fip_header fip;
 393                 struct {
 394                         struct fip_mac_desc mac;
 395                         struct fip_wwn_desc wwnn;
 396                         struct fip_size_desc size;
 397                 } __packed desc;
 398         }  __packed * sol;
 399         u32 fcoe_size;
 400
 401         skb = dev_alloc_skb(sizeof(*sol));
 402         if (!skb)
 403                 return;
 404
 405         sol = (struct fip_sol *)skb->data;
 406
 407         memset(sol, 0, sizeof(*sol));
 408         memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
 409         memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 410         sol->eth.h_proto = htons(ETH_P_FIP);
 411
 412         sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 413         sol->fip.fip_op = htons(FIP_OP_DISC);
 414         sol->fip.fip_subcode = FIP_SC_SOL;
 415         sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
 416         sol->fip.fip_flags = htons(FIP_FL_FPMA);
 417         if (fip->spma)
 418                 sol->fip.fip_flags |= htons(FIP_FL_SPMA);
 419
 420         sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
 421         sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
 422         memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 423
 424         sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
 425         sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
 426         put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
 427
 428         fcoe_size = fcoe_ctlr_fcoe_size(fip);
 429         sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
 430         sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
 431         sol->desc.size.fd_size = htons(fcoe_size);
 432
 433         skb_put(skb, sizeof(*sol));
 434         skb->protocol = htons(ETH_P_FIP);
 435         skb->priority = fip->priority;
 436         skb_reset_mac_header(skb);
 437         skb_reset_network_header(skb);
 438         fip->send(fip, skb);
 439
 440         if (!fcf)
 441                 fip->sol_time = jiffies;
 442 }
 443
 444 /**
 445  * fcoe_ctlr_link_up() - Start FCoE controller
 446  * @fip: The FCoE controller to start
 447  *
 448  * Called from the LLD when the network link is ready.
 449  */
 450 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
 451 {
 452         mutex_lock(&fip->ctlr_mutex);
 453         if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
 454                 mutex_unlock(&fip->ctlr_mutex);
 455                 fc_linkup(fip->lp);
 456         } else if (fip->state == FIP_ST_LINK_WAIT) {
 457                 fcoe_ctlr_set_state(fip, fip->mode);
 458                 switch (fip->mode) {
 459                 default:
 460                         LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode);
 461                         /* fall-through */
 462                 case FIP_MODE_AUTO:
 463                         LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
 464                         /* fall-through */
 465                 case FIP_MODE_FABRIC:
 466                 case FIP_MODE_NON_FIP:
 467                         mutex_unlock(&fip->ctlr_mutex);
 468                         fc_linkup(fip->lp);
 469                         fcoe_ctlr_solicit(fip, NULL);
 470                         break;
 471                 case FIP_MODE_VN2VN:
 472                         fcoe_ctlr_vn_start(fip);
 473                         mutex_unlock(&fip->ctlr_mutex);
 474                         fc_linkup(fip->lp);
 475                         break;
 476                 }
 477         } else
 478                 mutex_unlock(&fip->ctlr_mutex);
 479 }
 480 EXPORT_SYMBOL(fcoe_ctlr_link_up);
 481
 482 /**
 483  * fcoe_ctlr_reset() - Reset a FCoE controller
 484  * @fip:       The FCoE controller to reset
 485  */
 486 static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
 487 {
 488         fcoe_ctlr_reset_fcfs(fip);
 489         del_timer(&fip->timer);
 490         fip->ctlr_ka_time = 0;
 491         fip->port_ka_time = 0;
 492         fip->sol_time = 0;
 493         fip->flogi_oxid = FC_XID_UNKNOWN;
 494         fcoe_ctlr_map_dest(fip);
 495 }
 496
 497 /**
 498  * fcoe_ctlr_link_down() - Stop a FCoE controller
 499  * @fip: The FCoE controller to be stopped
 500  *
 501  * Returns non-zero if the link was up and now isn't.
 502  *
 503  * Called from the LLD when the network link is not ready.
 504  * There may be multiple calls while the link is down.
 505  */
 506 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
 507 {
 508         int link_dropped;
 509
 510         LIBFCOE_FIP_DBG(fip, "link down.\n");
 511         mutex_lock(&fip->ctlr_mutex);
 512         fcoe_ctlr_reset(fip);
 513         link_dropped = fip->state != FIP_ST_LINK_WAIT;
 514         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
 515         mutex_unlock(&fip->ctlr_mutex);
 516
 517         if (link_dropped)
 518                 fc_linkdown(fip->lp);
 519         return link_dropped;
 520 }
 521 EXPORT_SYMBOL(fcoe_ctlr_link_down);
 522
 523 /**
 524  * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
 525  * @fip:   The FCoE controller to send the FKA on
 526  * @lport: libfc fc_lport to send from
 527  * @ports: 0 for controller keep-alive, 1 for port keep-alive
 528  * @sa:    The source MAC address
 529  *
 530  * A controller keep-alive is sent every fka_period (typically 8 seconds).
 531  * The source MAC is the native MAC address.
 532  *
 533  * A port keep-alive is sent every 90 seconds while logged in.
 534  * The source MAC is the assigned mapped source address.
 535  * The destination is the FCF's F-port.
 536  */
 537 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
 538                                       struct fc_lport *lport,
 539                                       int ports, u8 *sa)
 540 {
 541         struct sk_buff *skb;
 542         struct fip_kal {
 543                 struct ethhdr eth;
 544                 struct fip_header fip;
 545                 struct fip_mac_desc mac;
 546         } __packed * kal;
 547         struct fip_vn_desc *vn;
 548         u32 len;
 549         struct fc_lport *lp;
 550         struct fcoe_fcf *fcf;
 551
 552         fcf = fip->sel_fcf;
 553         lp = fip->lp;
 554         if (!fcf || (ports && !lp->port_id))
 555                 return;
 556
 557         len = sizeof(*kal) + ports * sizeof(*vn);
 558         skb = dev_alloc_skb(len);
 559         if (!skb)
 560                 return;
 561
 562         kal = (struct fip_kal *)skb->data;
 563         memset(kal, 0, len);
 564         memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 565         memcpy(kal->eth.h_source, sa, ETH_ALEN);
 566         kal->eth.h_proto = htons(ETH_P_FIP);
 567
 568         kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 569         kal->fip.fip_op = htons(FIP_OP_CTRL);
 570         kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
 571         kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
 572                                      ports * sizeof(*vn)) / FIP_BPW);
 573         kal->fip.fip_flags = htons(FIP_FL_FPMA);
 574         if (fip->spma)
 575                 kal->fip.fip_flags |= htons(FIP_FL_SPMA);
 576
 577         kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
 578         kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
 579         memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 580         if (ports) {
 581                 vn = (struct fip_vn_desc *)(kal + 1);
 582                 vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
 583                 vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
 584                 memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
 585                 hton24(vn->fd_fc_id, lport->port_id);
 586                 put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
 587         }
 588         skb_put(skb, len);
 589         skb->protocol = htons(ETH_P_FIP);
 590         skb->priority = fip->priority;
 591         skb_reset_mac_header(skb);
 592         skb_reset_network_header(skb);
 593         fip->send(fip, skb);
 594 }
 595
 596 /**
 597  * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
 598  * @fip:   The FCoE controller for the ELS frame
 599  * @dtype: The FIP descriptor type for the frame
 600  * @skb:   The FCoE ELS frame including FC header but no FCoE headers
 601  * @d_id:  The destination port ID.
 602  *
 603  * Returns non-zero error code on failure.
 604  *
 605  * The caller must check that the length is a multiple of 4.
 606  *
 607  * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
 608  * Headroom includes the FIP encapsulation description, FIP header, and
 609  * Ethernet header.  The tailroom is for the FIP MAC descriptor.
 610  */
 611 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
 612                             u8 dtype, struct sk_buff *skb, u32 d_id)
 613 {
 614         struct fip_encaps_head {
 615                 struct ethhdr eth;
 616                 struct fip_header fip;
 617                 struct fip_encaps encaps;
 618         } __packed * cap;
 619         struct fc_frame_header *fh;
 620         struct fip_mac_desc *mac;
 621         struct fcoe_fcf *fcf;
 622         size_t dlen;
 623         u16 fip_flags;
 624         u8 op;
 625
 626         fh = (struct fc_frame_header *)skb->data;
 627         op = *(u8 *)(fh + 1);
 628         dlen = sizeof(struct fip_encaps) + skb->len;    /* len before push */
 629         cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));
 630         memset(cap, 0, sizeof(*cap));
 631
 632         if (lport->point_to_multipoint) {
 633                 if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest))
 634                         return -ENODEV;
 635                 fip_flags = 0;
 636         } else {
 637                 fcf = fip->sel_fcf;
 638                 if (!fcf)
 639                         return -ENODEV;
 640                 fip_flags = fcf->flags;
 641                 fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA :
 642                                          FIP_FL_FPMA;
 643                 if (!fip_flags)
 644                         return -ENODEV;
 645                 memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 646         }
 647         memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 648         cap->eth.h_proto = htons(ETH_P_FIP);
 649
 650         cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 651         cap->fip.fip_op = htons(FIP_OP_LS);
 652         if (op == ELS_LS_ACC || op == ELS_LS_RJT)
 653                 cap->fip.fip_subcode = FIP_SC_REP;
 654         else
 655                 cap->fip.fip_subcode = FIP_SC_REQ;
 656         cap->fip.fip_flags = htons(fip_flags);
 657
 658         cap->encaps.fd_desc.fip_dtype = dtype;
 659         cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
 660
 661         if (op != ELS_LS_RJT) {
 662                 dlen += sizeof(*mac);
 663                 mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
 664                 memset(mac, 0, sizeof(*mac));
 665                 mac->fd_desc.fip_dtype = FIP_DT_MAC;
 666                 mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
 667                 if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
 668                         memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
 669                 } else if (fip->mode == FIP_MODE_VN2VN) {
 670                         hton24(mac->fd_mac, FIP_VN_FC_MAP);
 671                         hton24(mac->fd_mac + 3, fip->port_id);
 672                 } else if (fip_flags & FIP_FL_SPMA) {
 673                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
 674                         memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
 675                 } else {
 676                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
 677                         /* FPMA only FLOGI.  Must leave the MAC desc zeroed. */
 678                 }
 679         }
 680         cap->fip.fip_dl_len = htons(dlen / FIP_BPW);
 681
 682         skb->protocol = htons(ETH_P_FIP);
 683         skb->priority = fip->priority;
 684         skb_reset_mac_header(skb);
 685         skb_reset_network_header(skb);
 686         return 0;
 687 }
 688
 689 /**
 690  * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
 691  * @fip:        FCoE controller.
 692  * @lport:      libfc fc_lport to send from
 693  * @skb:        FCoE ELS frame including FC header but no FCoE headers.
 694  *
 695  * Returns a non-zero error code if the frame should not be sent.
 696  * Returns zero if the caller should send the frame with FCoE encapsulation.
 697  *
 698  * The caller must check that the length is a multiple of 4.
 699  * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
 700  * The the skb must also be an fc_frame.
 701  *
 702  * This is called from the lower-level driver with spinlocks held,
 703  * so we must not take a mutex here.
 704  */
 705 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
 706                        struct sk_buff *skb)
 707 {
 708         struct fc_frame *fp;
 709         struct fc_frame_header *fh;
 710         u16 old_xid;
 711         u8 op;
 712         u8 mac[ETH_ALEN];
 713
 714         fp = container_of(skb, struct fc_frame, skb);
 715         fh = (struct fc_frame_header *)skb->data;
 716         op = *(u8 *)(fh + 1);
 717
 718         if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) {
 719                 old_xid = fip->flogi_oxid;
 720                 fip->flogi_oxid = ntohs(fh->fh_ox_id);
 721                 if (fip->state == FIP_ST_AUTO) {
 722                         if (old_xid == FC_XID_UNKNOWN)
 723                                 fip->flogi_count = 0;
 724                         fip->flogi_count++;
 725                         if (fip->flogi_count < 3)
 726                                 goto drop;
 727                         fcoe_ctlr_map_dest(fip);
 728                         return 0;
 729                 }
 730                 if (fip->state == FIP_ST_NON_FIP)
 731                         fcoe_ctlr_map_dest(fip);
 732         }
 733
 734         if (fip->state == FIP_ST_NON_FIP)
 735                 return 0;
 736         if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN)
 737                 goto drop;
 738         switch (op) {
 739         case ELS_FLOGI:
 740                 op = FIP_DT_FLOGI;
 741                 if (fip->mode == FIP_MODE_VN2VN)
 742                         break;
 743                 spin_lock_bh(&fip->ctlr_lock);
 744                 kfree_skb(fip->flogi_req);
 745                 fip->flogi_req = skb;
 746                 fip->flogi_req_send = 1;
 747                 spin_unlock_bh(&fip->ctlr_lock);
 748                 schedule_work(&fip->timer_work);
 749                 return -EINPROGRESS;
 750         case ELS_FDISC:
 751                 if (ntoh24(fh->fh_s_id))
 752                         return 0;
 753                 op = FIP_DT_FDISC;
 754                 break;
 755         case ELS_LOGO:
 756                 if (fip->mode == FIP_MODE_VN2VN) {
 757                         if (fip->state != FIP_ST_VNMP_UP)
 758                                 return -EINVAL;
 759                         if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI)
 760                                 return -EINVAL;
 761                 } else {
 762                         if (fip->state != FIP_ST_ENABLED)
 763                                 return 0;
 764                         if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
 765                                 return 0;
 766                 }
 767                 op = FIP_DT_LOGO;
 768                 break;
 769         case ELS_LS_ACC:
 770                 /*
 771                  * If non-FIP, we may have gotten an SID by accepting an FLOGI
 772                  * from a point-to-point connection.  Switch to using
 773                  * the source mac based on the SID.  The destination
 774                  * MAC in this case would have been set by receiving the
 775                  * FLOGI.
 776                  */
 777                 if (fip->state == FIP_ST_NON_FIP) {
 778                         if (fip->flogi_oxid == FC_XID_UNKNOWN)
 779                                 return 0;
 780                         fip->flogi_oxid = FC_XID_UNKNOWN;
 781                         fc_fcoe_set_mac(mac, fh->fh_d_id);
 782                         fip->update_mac(lport, mac);
 783                 }
 784                 /* fall through */
 785         case ELS_LS_RJT:
 786                 op = fr_encaps(fp);
 787                 if (op)
 788                         break;
 789                 return 0;
 790         default:
 791                 if (fip->state != FIP_ST_ENABLED &&
 792                     fip->state != FIP_ST_VNMP_UP)
 793                         goto drop;
 794                 return 0;
 795         }
 796         LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n",
 797                         op, ntoh24(fh->fh_d_id));
 798         if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id)))
 799                 goto drop;
 800         fip->send(fip, skb);
 801         return -EINPROGRESS;
 802 drop:
 803         kfree_skb(skb);
 804         LIBFCOE_FIP_DBG(fip, "drop els_send op %u d_id %x\n",
 805                         op, ntoh24(fh->fh_d_id));
 806         return -EINVAL;
 807 }
 808 EXPORT_SYMBOL(fcoe_ctlr_els_send);
 809
 810 /**
 811  * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
 812  * @fip: The FCoE controller to free FCFs on
 813  *
 814  * Called with lock held and preemption disabled.
 815  *
 816  * An FCF is considered old if we have missed two advertisements.
 817  * That is, there have been no valid advertisement from it for 2.5
 818  * times its keep-alive period.
 819  *
 820  * In addition, determine the time when an FCF selection can occur.
 821  *
 822  * Also, increment the MissDiscAdvCount when no advertisement is received
 823  * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
 824  *
 825  * Returns the time in jiffies for the next call.
 826  */
 827 static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
 828 {
 829         struct fcoe_fcf *fcf;
 830         struct fcoe_fcf *next;
 831         unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
 832         unsigned long deadline;
 833         unsigned long sel_time = 0;
 834         struct list_head del_list;
 835         struct fc_stats *stats;
 836
 837         INIT_LIST_HEAD(&del_list);
 838
 839         stats = per_cpu_ptr(fip->lp->stats, get_cpu());
 840
 841         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 842                 deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
 843                 if (fip->sel_fcf == fcf) {
 844                         if (time_after(jiffies, deadline)) {
 845                                 stats->MissDiscAdvCount++;
 846                                 printk(KERN_INFO "libfcoe: host%d: "
 847                                        "Missing Discovery Advertisement "
 848                                        "for fab %16.16llx count %lld\n",
 849                                        fip->lp->host->host_no, fcf->fabric_name,
 850                                        stats->MissDiscAdvCount);
 851                         } else if (time_after(next_timer, deadline))
 852                                 next_timer = deadline;
 853                 }
 854
 855                 deadline += fcf->fka_period;
 856                 if (time_after_eq(jiffies, deadline)) {
 857                         if (fip->sel_fcf == fcf)
 858                                 fip->sel_fcf = NULL;
 859                         /*
 860                          * Move to delete list so we can call
 861                          * fcoe_sysfs_fcf_del (which can sleep)
 862                          * after the put_cpu().
 863                          */
 864                         list_del(&fcf->list);
 865                         list_add(&fcf->list, &del_list);
 866                         stats->VLinkFailureCount++;
 867                 } else {
 868                         if (time_after(next_timer, deadline))
 869                                 next_timer = deadline;
 870                         if (fcoe_ctlr_mtu_valid(fcf) &&
 871                             (!sel_time || time_before(sel_time, fcf->time)))
 872                                 sel_time = fcf->time;
 873                 }
 874         }
 875         put_cpu();
 876
 877         list_for_each_entry_safe(fcf, next, &del_list, list) {
 878                 /* Removes fcf from current list */
 879                 fcoe_sysfs_fcf_del(fcf);
 880         }
 881
 882         if (sel_time && !fip->sel_fcf && !fip->sel_time) {
 883                 sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
 884                 fip->sel_time = sel_time;
 885         }
 886
 887         return next_timer;
 888 }
 889
 890 /**
 891  * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
 892  * @fip: The FCoE controller receiving the advertisement
 893  * @skb: The received FIP advertisement frame
 894  * @fcf: The resulting FCF entry
 895  *
 896  * Returns zero on a valid parsed advertisement,
 897  * otherwise returns non zero value.
 898  */
 899 static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
 900                                struct sk_buff *skb, struct fcoe_fcf *fcf)
 901 {
 902         struct fip_header *fiph;
 903         struct fip_desc *desc = NULL;
 904         struct fip_wwn_desc *wwn;
 905         struct fip_fab_desc *fab;
 906         struct fip_fka_desc *fka;
 907         unsigned long t;
 908         size_t rlen;
 909         size_t dlen;
 910         u32 desc_mask;
 911
 912         memset(fcf, 0, sizeof(*fcf));
 913         fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
 914
 915         fiph = (struct fip_header *)skb->data;
 916         fcf->flags = ntohs(fiph->fip_flags);
 917
 918         /*
 919          * mask of required descriptors. validating each one clears its bit.
 920          */
 921         desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
 922                         BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA);
 923
 924         rlen = ntohs(fiph->fip_dl_len) * 4;
 925         if (rlen + sizeof(*fiph) > skb->len)
 926                 return -EINVAL;
 927
 928         desc = (struct fip_desc *)(fiph + 1);
 929         while (rlen > 0) {
 930                 dlen = desc->fip_dlen * FIP_BPW;
 931                 if (dlen < sizeof(*desc) || dlen > rlen)
 932                         return -EINVAL;
 933                 /* Drop Adv if there are duplicate critical descriptors */
 934                 if ((desc->fip_dtype < 32) &&
 935                     !(desc_mask & 1U << desc->fip_dtype)) {
 936                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
 937                                         "Descriptors in FIP adv\n");
 938                         return -EINVAL;
 939                 }
 940                 switch (desc->fip_dtype) {
 941                 case FIP_DT_PRI:
 942                         if (dlen != sizeof(struct fip_pri_desc))
 943                                 goto len_err;
 944                         fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
 945                         desc_mask &= ~BIT(FIP_DT_PRI);
 946                         break;
 947                 case FIP_DT_MAC:
 948                         if (dlen != sizeof(struct fip_mac_desc))
 949                                 goto len_err;
 950                         memcpy(fcf->fcf_mac,
 951                                ((struct fip_mac_desc *)desc)->fd_mac,
 952                                ETH_ALEN);
 953                         memcpy(fcf->fcoe_mac, fcf->fcf_mac, ETH_ALEN);
 954                         if (!is_valid_ether_addr(fcf->fcf_mac)) {
 955                                 LIBFCOE_FIP_DBG(fip,
 956                                         "Invalid MAC addr %pM in FIP adv\n",
 957                                         fcf->fcf_mac);
 958                                 return -EINVAL;
 959                         }
 960                         desc_mask &= ~BIT(FIP_DT_MAC);
 961                         break;
 962                 case FIP_DT_NAME:
 963                         if (dlen != sizeof(struct fip_wwn_desc))
 964                                 goto len_err;
 965                         wwn = (struct fip_wwn_desc *)desc;
 966                         fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
 967                         desc_mask &= ~BIT(FIP_DT_NAME);
 968                         break;
 969                 case FIP_DT_FAB:
 970                         if (dlen != sizeof(struct fip_fab_desc))
 971                                 goto len_err;
 972                         fab = (struct fip_fab_desc *)desc;
 973                         fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
 974                         fcf->vfid = ntohs(fab->fd_vfid);
 975                         fcf->fc_map = ntoh24(fab->fd_map);
 976                         desc_mask &= ~BIT(FIP_DT_FAB);
 977                         break;
 978                 case FIP_DT_FKA:
 979                         if (dlen != sizeof(struct fip_fka_desc))
 980                                 goto len_err;
 981                         fka = (struct fip_fka_desc *)desc;
 982                         if (fka->fd_flags & FIP_FKA_ADV_D)
 983                                 fcf->fd_flags = 1;
 984                         t = ntohl(fka->fd_fka_period);
 985                         if (t >= FCOE_CTLR_MIN_FKA)
 986                                 fcf->fka_period = msecs_to_jiffies(t);
 987                         desc_mask &= ~BIT(FIP_DT_FKA);
 988                         break;
 989                 case FIP_DT_MAP_OUI:
 990                 case FIP_DT_FCOE_SIZE:
 991                 case FIP_DT_FLOGI:
 992                 case FIP_DT_FDISC:
 993                 case FIP_DT_LOGO:
 994                 case FIP_DT_ELP:
 995                 default:
 996                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
 997                                         "in FIP adv\n", desc->fip_dtype);
 998                         /* standard says ignore unknown descriptors >= 128 */
 999                         if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
1000                                 return -EINVAL;
1001                         break;
1002                 }
1003                 desc = (struct fip_desc *)((char *)desc + dlen);
1004                 rlen -= dlen;
1005         }
1006         if (!fcf->fc_map || (fcf->fc_map & 0x10000))
1007                 return -EINVAL;
1008         if (!fcf->switch_name)
1009                 return -EINVAL;
1010         if (desc_mask) {
1011                 LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n",
1012                                 desc_mask);
1013                 return -EINVAL;
1014         }
1015         return 0;
1016
1017 len_err:
1018         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1019                         desc->fip_dtype, dlen);
1020         return -EINVAL;
1021 }
1022
1023 /**
1024  * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
1025  * @fip: The FCoE controller receiving the advertisement
1026  * @skb: The received FIP packet
1027  */
1028 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1029 {
1030         struct fcoe_fcf *fcf;
1031         struct fcoe_fcf new;
1032         unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
1033         int first = 0;
1034         int mtu_valid;
1035         int found = 0;
1036         int rc = 0;
1037
1038         if (fcoe_ctlr_parse_adv(fip, skb, &new))
1039                 return;
1040
1041         mutex_lock(&fip->ctlr_mutex);
1042         first = list_empty(&fip->fcfs);
1043         list_for_each_entry(fcf, &fip->fcfs, list) {
1044                 if (fcf->switch_name == new.switch_name &&
1045                     fcf->fabric_name == new.fabric_name &&
1046                     fcf->fc_map == new.fc_map &&
1047                     ether_addr_equal(fcf->fcf_mac, new.fcf_mac)) {
1048                         found = 1;
1049                         break;
1050                 }
1051         }
1052         if (!found) {
1053                 if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
1054                         goto out;
1055
1056                 fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
1057                 if (!fcf)
1058                         goto out;
1059
1060                 memcpy(fcf, &new, sizeof(new));
1061                 fcf->fip = fip;
1062                 rc = fcoe_sysfs_fcf_add(fcf);
1063                 if (rc) {
1064                         printk(KERN_ERR "Failed to allocate sysfs instance "
1065                                "for FCF, fab %16.16llx mac %pM\n",
1066                                new.fabric_name, new.fcf_mac);
1067                         kfree(fcf);
1068                         goto out;
1069                 }
1070         } else {
1071                 /*
1072                  * Update the FCF's keep-alive descriptor flags.
1073                  * Other flag changes from new advertisements are
1074                  * ignored after a solicited advertisement is
1075                  * received and the FCF is selectable (usable).
1076                  */
1077                 fcf->fd_flags = new.fd_flags;
1078                 if (!fcoe_ctlr_fcf_usable(fcf))
1079                         fcf->flags = new.flags;
1080
1081                 if (fcf == fip->sel_fcf && !fcf->fd_flags) {
1082                         fip->ctlr_ka_time -= fcf->fka_period;
1083                         fip->ctlr_ka_time += new.fka_period;
1084                         if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1085                                 mod_timer(&fip->timer, fip->ctlr_ka_time);
1086                 }
1087                 fcf->fka_period = new.fka_period;
1088                 memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
1089         }
1090
1091         mtu_valid = fcoe_ctlr_mtu_valid(fcf);
1092         fcf->time = jiffies;
1093         if (!found)
1094                 LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
1095                                 fcf->fabric_name, fcf->fcf_mac);
1096
1097         /*
1098          * If this advertisement is not solicited and our max receive size
1099          * hasn't been verified, send a solicited advertisement.
1100          */
1101         if (!mtu_valid)
1102                 fcoe_ctlr_solicit(fip, fcf);
1103
1104         /*
1105          * If its been a while since we did a solicit, and this is
1106          * the first advertisement we've received, do a multicast
1107          * solicitation to gather as many advertisements as we can
1108          * before selection occurs.
1109          */
1110         if (first && time_after(jiffies, fip->sol_time + sol_tov))
1111                 fcoe_ctlr_solicit(fip, NULL);
1112
1113         /*
1114          * Put this FCF at the head of the list for priority among equals.
1115          * This helps in the case of an NPV switch which insists we use
1116          * the FCF that answers multicast solicitations, not the others that
1117          * are sending periodic multicast advertisements.
1118          */
1119         if (mtu_valid)
1120                 list_move(&fcf->list, &fip->fcfs);
1121
1122         /*
1123          * If this is the first validated FCF, note the time and
1124          * set a timer to trigger selection.
1125          */
1126         if (mtu_valid && !fip->sel_fcf && !fip->sel_time &&
1127             fcoe_ctlr_fcf_usable(fcf)) {
1128                 fip->sel_time = jiffies +
1129                         msecs_to_jiffies(FCOE_CTLR_START_DELAY);
1130                 if (!timer_pending(&fip->timer) ||
1131                     time_before(fip->sel_time, fip->timer.expires))
1132                         mod_timer(&fip->timer, fip->sel_time);
1133         }
1134
1135 out:
1136         mutex_unlock(&fip->ctlr_mutex);
1137 }
1138
1139 /**
1140  * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
1141  * @fip: The FCoE controller which received the packet
1142  * @skb: The received FIP packet
1143  */
1144 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
1145 {
1146         struct fc_lport *lport = fip->lp;
1147         struct fip_header *fiph;
1148         struct fc_frame *fp = (struct fc_frame *)skb;
1149         struct fc_frame_header *fh = NULL;
1150         struct fip_desc *desc;
1151         struct fip_encaps *els;
1152         struct fcoe_fcf *sel;
1153         struct fc_stats *stats;
1154         enum fip_desc_type els_dtype = 0;
1155         u8 els_op;
1156         u8 sub;
1157         u8 granted_mac[ETH_ALEN] = { 0 };
1158         size_t els_len = 0;
1159         size_t rlen;
1160         size_t dlen;
1161         u32 desc_mask = 0;
1162         u32 desc_cnt = 0;
1163
1164         fiph = (struct fip_header *)skb->data;
1165         sub = fiph->fip_subcode;
1166         if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
1167                 goto drop;
1168
1169         rlen = ntohs(fiph->fip_dl_len) * 4;
1170         if (rlen + sizeof(*fiph) > skb->len)
1171                 goto drop;
1172
1173         desc = (struct fip_desc *)(fiph + 1);
1174         while (rlen > 0) {
1175                 desc_cnt++;
1176                 dlen = desc->fip_dlen * FIP_BPW;
1177                 if (dlen < sizeof(*desc) || dlen > rlen)
1178                         goto drop;
1179                 /* Drop ELS if there are duplicate critical descriptors */
1180                 if (desc->fip_dtype < 32) {
1181                         if ((desc->fip_dtype != FIP_DT_MAC) &&
1182                             (desc_mask & 1U << desc->fip_dtype)) {
1183                                 LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1184                                                 "Descriptors in FIP ELS\n");
1185                                 goto drop;
1186                         }
1187                         desc_mask |= (1 << desc->fip_dtype);
1188                 }
1189                 switch (desc->fip_dtype) {
1190                 case FIP_DT_MAC:
1191                         sel = fip->sel_fcf;
1192                         if (desc_cnt == 1) {
1193                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1194                                                 "received out of order\n");
1195                                 goto drop;
1196                         }
1197                         /*
1198                          * Some switch implementations send two MAC descriptors,
1199                          * with first MAC(granted_mac) being the FPMA, and the
1200                          * second one(fcoe_mac) is used as destination address
1201                          * for sending/receiving FCoE packets. FIP traffic is
1202                          * sent using fip_mac. For regular switches, both
1203                          * fip_mac and fcoe_mac would be the same.
1204                          */
1205                         if (desc_cnt == 2)
1206                                 memcpy(granted_mac,
1207                                        ((struct fip_mac_desc *)desc)->fd_mac,
1208                                        ETH_ALEN);
1209
1210                         if (dlen != sizeof(struct fip_mac_desc))
1211                                 goto len_err;
1212
1213                         if ((desc_cnt == 3) && (sel))
1214                                 memcpy(sel->fcoe_mac,
1215                                        ((struct fip_mac_desc *)desc)->fd_mac,
1216                                        ETH_ALEN);
1217                         break;
1218                 case FIP_DT_FLOGI:
1219                 case FIP_DT_FDISC:
1220                 case FIP_DT_LOGO:
1221                 case FIP_DT_ELP:
1222                         if (desc_cnt != 1) {
1223                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1224                                                 "received out of order\n");
1225                                 goto drop;
1226                         }
1227                         if (fh)
1228                                 goto drop;
1229                         if (dlen < sizeof(*els) + sizeof(*fh) + 1)
1230                                 goto len_err;
1231                         els_len = dlen - sizeof(*els);
1232                         els = (struct fip_encaps *)desc;
1233                         fh = (struct fc_frame_header *)(els + 1);
1234                         els_dtype = desc->fip_dtype;
1235                         break;
1236                 default:
1237                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
1238                                         "in FIP adv\n", desc->fip_dtype);
1239                         /* standard says ignore unknown descriptors >= 128 */
1240                         if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
1241                                 goto drop;
1242                         if (desc_cnt <= 2) {
1243                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1244                                                 "received out of order\n");
1245                                 goto drop;
1246                         }
1247                         break;
1248                 }
1249                 desc = (struct fip_desc *)((char *)desc + dlen);
1250                 rlen -= dlen;
1251         }
1252
1253         if (!fh)
1254                 goto drop;
1255         els_op = *(u8 *)(fh + 1);
1256
1257         if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) &&
1258             sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) {
1259                 if (els_op == ELS_LS_ACC) {
1260                         if (!is_valid_ether_addr(granted_mac)) {
1261                                 LIBFCOE_FIP_DBG(fip,
1262                                         "Invalid MAC address %pM in FIP ELS\n",
1263                                         granted_mac);
1264                                 goto drop;
1265                         }
1266                         memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
1267
1268                         if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1269                                 fip->flogi_oxid = FC_XID_UNKNOWN;
1270                                 if (els_dtype == FIP_DT_FLOGI)
1271                                         fcoe_ctlr_announce(fip);
1272                         }
1273                 } else if (els_dtype == FIP_DT_FLOGI &&
1274                            !fcoe_ctlr_flogi_retry(fip))
1275                         goto drop;      /* retrying FLOGI so drop reject */
1276         }
1277
1278         if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
1279             (!(1U << FIP_DT_MAC & desc_mask)))) {
1280                 LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
1281                                 "in FIP ELS\n");
1282                 goto drop;
1283         }
1284
1285         /*
1286          * Convert skb into an fc_frame containing only the ELS.
1287          */
1288         skb_pull(skb, (u8 *)fh - skb->data);
1289         skb_trim(skb, els_len);
1290         fp = (struct fc_frame *)skb;
1291         fc_frame_init(fp);
1292         fr_sof(fp) = FC_SOF_I3;
1293         fr_eof(fp) = FC_EOF_T;
1294         fr_dev(fp) = lport;
1295         fr_encaps(fp) = els_dtype;
1296
1297         stats = per_cpu_ptr(lport->stats, get_cpu());
1298         stats->RxFrames++;
1299         stats->RxWords += skb->len / FIP_BPW;
1300         put_cpu();
1301
1302         fc_exch_recv(lport, fp);
1303         return;
1304
1305 len_err:
1306         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1307                         desc->fip_dtype, dlen);
1308 drop:
1309         kfree_skb(skb);
1310 }
1311
1312 /**
1313  * fcoe_ctlr_recv_els() - Handle an incoming link reset frame
1314  * @fip: The FCoE controller that received the frame
1315  * @fh:  The received FIP header
1316  *
1317  * There may be multiple VN_Port descriptors.
1318  * The overall length has already been checked.
1319  */
1320 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
1321                                      struct sk_buff *skb)
1322 {
1323         struct fip_desc *desc;
1324         struct fip_mac_desc *mp;
1325         struct fip_wwn_desc *wp;
1326         struct fip_vn_desc *vp;
1327         size_t rlen;
1328         size_t dlen;
1329         struct fcoe_fcf *fcf = fip->sel_fcf;
1330         struct fc_lport *lport = fip->lp;
1331         struct fc_lport *vn_port = NULL;
1332         u32 desc_mask;
1333         int num_vlink_desc;
1334         int reset_phys_port = 0;
1335         struct fip_vn_desc **vlink_desc_arr = NULL;
1336         struct fip_header *fh = (struct fip_header *)skb->data;
1337         struct ethhdr *eh = eth_hdr(skb);
1338
1339         LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
1340
1341         if (!fcf) {
1342                 /*
1343                  * We are yet to select best FCF, but we got CVL in the
1344                  * meantime. reset the ctlr and let it rediscover the FCF
1345                  */
1346                 LIBFCOE_FIP_DBG(fip, "Resetting fcoe_ctlr as FCF has not been "
1347                     "selected yet\n");
1348                 mutex_lock(&fip->ctlr_mutex);
1349                 fcoe_ctlr_reset(fip);
1350                 mutex_unlock(&fip->ctlr_mutex);
1351                 return;
1352         }
1353
1354         /*
1355          * If we've selected an FCF check that the CVL is from there to avoid
1356          * processing CVLs from an unexpected source.  If it is from an
1357          * unexpected source drop it on the floor.
1358          */
1359         if (!ether_addr_equal(eh->h_source, fcf->fcf_mac)) {
1360                 LIBFCOE_FIP_DBG(fip, "Dropping CVL due to source address "
1361                     "mismatch with FCF src=%pM\n", eh->h_source);
1362                 return;
1363         }
1364
1365         /*
1366          * If we haven't logged into the fabric but receive a CVL we should
1367          * reset everything and go back to solicitation.
1368          */
1369         if (!lport->port_id) {
1370                 LIBFCOE_FIP_DBG(fip, "lport not logged in, resoliciting\n");
1371                 mutex_lock(&fip->ctlr_mutex);
1372                 fcoe_ctlr_reset(fip);
1373                 mutex_unlock(&fip->ctlr_mutex);
1374                 fc_lport_reset(fip->lp);
1375                 fcoe_ctlr_solicit(fip, NULL);
1376                 return;
1377         }
1378
1379         /*
1380          * mask of required descriptors.  Validating each one clears its bit.
1381          */
1382         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
1383
1384         rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
1385         desc = (struct fip_desc *)(fh + 1);
1386
1387         /*
1388          * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
1389          * before determining max Vx_Port descriptor but a buggy FCF could have
1390          * omited either or both MAC Address and Name Identifier descriptors
1391          */
1392         num_vlink_desc = rlen / sizeof(*vp);
1393         if (num_vlink_desc)
1394                 vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc,
1395                                          GFP_ATOMIC);
1396         if (!vlink_desc_arr)
1397                 return;
1398         num_vlink_desc = 0;
1399
1400         while (rlen >= sizeof(*desc)) {
1401                 dlen = desc->fip_dlen * FIP_BPW;
1402                 if (dlen > rlen)
1403                         goto err;
1404                 /* Drop CVL if there are duplicate critical descriptors */
1405                 if ((desc->fip_dtype < 32) &&
1406                     (desc->fip_dtype != FIP_DT_VN_ID) &&
1407                     !(desc_mask & 1U << desc->fip_dtype)) {
1408                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1409                                         "Descriptors in FIP CVL\n");
1410                         goto err;
1411                 }
1412                 switch (desc->fip_dtype) {
1413                 case FIP_DT_MAC:
1414                         mp = (struct fip_mac_desc *)desc;
1415                         if (dlen < sizeof(*mp))
1416                                 goto err;
1417                         if (!ether_addr_equal(mp->fd_mac, fcf->fcf_mac))
1418                                 goto err;
1419                         desc_mask &= ~BIT(FIP_DT_MAC);
1420                         break;
1421                 case FIP_DT_NAME:
1422                         wp = (struct fip_wwn_desc *)desc;
1423                         if (dlen < sizeof(*wp))
1424                                 goto err;
1425                         if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
1426                                 goto err;
1427                         desc_mask &= ~BIT(FIP_DT_NAME);
1428                         break;
1429                 case FIP_DT_VN_ID:
1430                         vp = (struct fip_vn_desc *)desc;
1431                         if (dlen < sizeof(*vp))
1432                                 goto err;
1433                         vlink_desc_arr[num_vlink_desc++] = vp;
1434                         vn_port = fc_vport_id_lookup(lport,
1435                                                       ntoh24(vp->fd_fc_id));
1436                         if (vn_port && (vn_port == lport)) {
1437                                 mutex_lock(&fip->ctlr_mutex);
1438                                 per_cpu_ptr(lport->stats,
1439                                             get_cpu())->VLinkFailureCount++;
1440                                 put_cpu();
1441                                 fcoe_ctlr_reset(fip);
1442                                 mutex_unlock(&fip->ctlr_mutex);
1443                         }
1444                         break;
1445                 default:
1446                         /* standard says ignore unknown descriptors >= 128 */
1447                         if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
1448                                 goto err;
1449                         break;
1450                 }
1451                 desc = (struct fip_desc *)((char *)desc + dlen);
1452                 rlen -= dlen;
1453         }
1454
1455         /*
1456          * reset only if all required descriptors were present and valid.
1457          */
1458         if (desc_mask)
1459                 LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
1460                                 desc_mask);
1461         else if (!num_vlink_desc) {
1462                 LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
1463                 /*
1464                  * No Vx_Port description. Clear all NPIV ports,
1465                  * followed by physical port
1466                  */
1467                 mutex_lock(&fip->ctlr_mutex);
1468                 per_cpu_ptr(lport->stats, get_cpu())->VLinkFailureCount++;
1469                 put_cpu();
1470                 fcoe_ctlr_reset(fip);
1471                 mutex_unlock(&fip->ctlr_mutex);
1472
1473                 mutex_lock(&lport->lp_mutex);
1474                 list_for_each_entry(vn_port, &lport->vports, list)
1475                         fc_lport_reset(vn_port);
1476                 mutex_unlock(&lport->lp_mutex);
1477
1478                 fc_lport_reset(fip->lp);
1479                 fcoe_ctlr_solicit(fip, NULL);
1480         } else {
1481                 int i;
1482
1483                 LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
1484                 for (i = 0; i < num_vlink_desc; i++) {
1485                         vp = vlink_desc_arr[i];
1486                         vn_port = fc_vport_id_lookup(lport,
1487                                                      ntoh24(vp->fd_fc_id));
1488                         if (!vn_port)
1489                                 continue;
1490
1491                         /*
1492                          * 'port_id' is already validated, check MAC address and
1493                          * wwpn
1494                          */
1495                         if (!ether_addr_equal(fip->get_src_addr(vn_port),
1496                                               vp->fd_mac) ||
1497                                 get_unaligned_be64(&vp->fd_wwpn) !=
1498                                                         vn_port->wwpn)
1499                                 continue;
1500
1501                         if (vn_port == lport)
1502                                 /*
1503                                  * Physical port, defer processing till all
1504                                  * listed NPIV ports are cleared
1505                                  */
1506                                 reset_phys_port = 1;
1507                         else    /* NPIV port */
1508                                 fc_lport_reset(vn_port);
1509                 }
1510
1511                 if (reset_phys_port) {
1512                         fc_lport_reset(fip->lp);
1513                         fcoe_ctlr_solicit(fip, NULL);
1514                 }
1515         }
1516
1517 err:
1518         kfree(vlink_desc_arr);
1519 }
1520
1521 /**
1522  * fcoe_ctlr_recv() - Receive a FIP packet
1523  * @fip: The FCoE controller that received the packet
1524  * @skb: The received FIP packet
1525  *
1526  * This may be called from either NET_RX_SOFTIRQ or IRQ.
1527  */
1528 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1529 {
1530         skb = skb_share_check(skb, GFP_ATOMIC);
1531         if (!skb)
1532                 return;
1533         skb_queue_tail(&fip->fip_recv_list, skb);
1534         schedule_work(&fip->recv_work);
1535 }
1536 EXPORT_SYMBOL(fcoe_ctlr_recv);
1537
1538 /**
1539  * fcoe_ctlr_recv_handler() - Receive a FIP frame
1540  * @fip: The FCoE controller that received the frame
1541  * @skb: The received FIP frame
1542  *
1543  * Returns non-zero if the frame is dropped.
1544  */
1545 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
1546 {
1547         struct fip_header *fiph;
1548         struct ethhdr *eh;
1549         enum fip_state state;
1550         bool fip_vlan_resp = false;
1551         u16 op;
1552         u8 sub;
1553
1554         if (skb_linearize(skb))
1555                 goto drop;
1556         if (skb->len < sizeof(*fiph))
1557                 goto drop;
1558         eh = eth_hdr(skb);
1559         if (fip->mode == FIP_MODE_VN2VN) {
1560                 if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
1561                     !ether_addr_equal(eh->h_dest, fcoe_all_vn2vn) &&
1562                     !ether_addr_equal(eh->h_dest, fcoe_all_p2p))
1563                         goto drop;
1564         } else if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
1565                    !ether_addr_equal(eh->h_dest, fcoe_all_enode))
1566                 goto drop;
1567         fiph = (struct fip_header *)skb->data;
1568         op = ntohs(fiph->fip_op);
1569         sub = fiph->fip_subcode;
1570
1571         if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
1572                 goto drop;
1573         if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
1574                 goto drop;
1575
1576         mutex_lock(&fip->ctlr_mutex);
1577         state = fip->state;
1578         if (state == FIP_ST_AUTO) {
1579                 fip->map_dest = 0;
1580                 fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
1581                 state = FIP_ST_ENABLED;
1582                 LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
1583         }
1584         fip_vlan_resp = fip->fip_resp;
1585         mutex_unlock(&fip->ctlr_mutex);
1586
1587         if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
1588                 return fcoe_ctlr_vn_recv(fip, skb);
1589
1590         if (fip_vlan_resp && op == FIP_OP_VLAN) {
1591                 LIBFCOE_FIP_DBG(fip, "fip vlan discovery\n");
1592                 return fcoe_ctlr_vlan_recv(fip, skb);
1593         }
1594
1595         if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
1596             state != FIP_ST_VNMP_CLAIM)
1597                 goto drop;
1598
1599         if (op == FIP_OP_LS) {
1600                 fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
1601                 return 0;
1602         }
1603
1604         if (state != FIP_ST_ENABLED)
1605                 goto drop;
1606
1607         if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
1608                 fcoe_ctlr_recv_adv(fip, skb);
1609         else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
1610                 fcoe_ctlr_recv_clr_vlink(fip, skb);
1611         kfree_skb(skb);
1612         return 0;
1613 drop:
1614         kfree_skb(skb);
1615         return -1;
1616 }
1617
1618 /**
1619  * fcoe_ctlr_select() - Select the best FCF (if possible)
1620  * @fip: The FCoE controller
1621  *
1622  * Returns the selected FCF, or NULL if none are usable.
1623  *
1624  * If there are conflicting advertisements, no FCF can be chosen.
1625  *
1626  * If there is already a selected FCF, this will choose a better one or
1627  * an equivalent one that hasn't already been sent a FLOGI.
1628  *
1629  * Called with lock held.
1630  */
1631 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
1632 {
1633         struct fcoe_fcf *fcf;
1634         struct fcoe_fcf *best = fip->sel_fcf;
1635
1636         list_for_each_entry(fcf, &fip->fcfs, list) {
1637                 LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
1638                                 "VFID %d mac %pM map %x val %d "
1639                                 "sent %u pri %u\n",
1640                                 fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
1641                                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
1642                                 fcf->flogi_sent, fcf->pri);
1643                 if (!fcoe_ctlr_fcf_usable(fcf)) {
1644                         LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
1645                                         "map %x %svalid %savailable\n",
1646                                         fcf->fabric_name, fcf->fc_map,
1647                                         (fcf->flags & FIP_FL_SOL) ? "" : "in",
1648                                         (fcf->flags & FIP_FL_AVAIL) ?
1649                                         "" : "un");
1650                         continue;
1651                 }
1652                 if (!best || fcf->pri < best->pri || best->flogi_sent)
1653                         best = fcf;
1654                 if (fcf->fabric_name != best->fabric_name ||
1655                     fcf->vfid != best->vfid ||
1656                     fcf->fc_map != best->fc_map) {
1657                         LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
1658                                         "or FC-MAP\n");
1659                         return NULL;
1660                 }
1661         }
1662         fip->sel_fcf = best;
1663         if (best) {
1664                 LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
1665                 fip->port_ka_time = jiffies +
1666                         msecs_to_jiffies(FIP_VN_KA_PERIOD);
1667                 fip->ctlr_ka_time = jiffies + best->fka_period;
1668                 if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1669                         mod_timer(&fip->timer, fip->ctlr_ka_time);
1670         }
1671         return best;
1672 }
1673
1674 /**
1675  * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
1676  * @fip: The FCoE controller
1677  *
1678  * Returns non-zero error if it could not be sent.
1679  *
1680  * Called with ctlr_mutex and ctlr_lock held.
1681  * Caller must verify that fip->sel_fcf is not NULL.
1682  */
1683 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
1684 {
1685         struct sk_buff *skb;
1686         struct sk_buff *skb_orig;
1687         struct fc_frame_header *fh;
1688         int error;
1689
1690         skb_orig = fip->flogi_req;
1691         if (!skb_orig)
1692                 return -EINVAL;
1693
1694         /*
1695          * Clone and send the FLOGI request.  If clone fails, use original.
1696          */
1697         skb = skb_clone(skb_orig, GFP_ATOMIC);
1698         if (!skb) {
1699                 skb = skb_orig;
1700                 fip->flogi_req = NULL;
1701         }
1702         fh = (struct fc_frame_header *)skb->data;
1703         error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
1704                                  ntoh24(fh->fh_d_id));
1705         if (error) {
1706                 kfree_skb(skb);
1707                 return error;
1708         }
1709         fip->send(fip, skb);
1710         fip->sel_fcf->flogi_sent = 1;
1711         return 0;
1712 }
1713
1714 /**
1715  * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
1716  * @fip: The FCoE controller
1717  *
1718  * Returns non-zero error code if there's no FLOGI request to retry or
1719  * no alternate FCF available.
1720  */
1721 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
1722 {
1723         struct fcoe_fcf *fcf;
1724         int error;
1725
1726         mutex_lock(&fip->ctlr_mutex);
1727         spin_lock_bh(&fip->ctlr_lock);
1728         LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
1729         fcf = fcoe_ctlr_select(fip);
1730         if (!fcf || fcf->flogi_sent) {
1731                 kfree_skb(fip->flogi_req);
1732                 fip->flogi_req = NULL;
1733                 error = -ENOENT;
1734         } else {
1735                 fcoe_ctlr_solicit(fip, NULL);
1736                 error = fcoe_ctlr_flogi_send_locked(fip);
1737         }
1738         spin_unlock_bh(&fip->ctlr_lock);
1739         mutex_unlock(&fip->ctlr_mutex);
1740         return error;
1741 }
1742
1743
1744 /**
1745  * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
1746  * @fip: The FCoE controller that timed out
1747  *
1748  * Done here because fcoe_ctlr_els_send() can't get mutex.
1749  *
1750  * Called with ctlr_mutex held.  The caller must not hold ctlr_lock.
1751  */
1752 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
1753 {
1754         struct fcoe_fcf *fcf;
1755
1756         spin_lock_bh(&fip->ctlr_lock);
1757         fcf = fip->sel_fcf;
1758         if (!fcf || !fip->flogi_req_send)
1759                 goto unlock;
1760
1761         LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
1762
1763         /*
1764          * If this FLOGI is being sent due to a timeout retry
1765          * to the same FCF as before, select a different FCF if possible.
1766          */
1767         if (fcf->flogi_sent) {
1768                 LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
1769                 fcf = fcoe_ctlr_select(fip);
1770                 if (!fcf || fcf->flogi_sent) {
1771                         LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
1772                         list_for_each_entry(fcf, &fip->fcfs, list)
1773                                 fcf->flogi_sent = 0;
1774                         fcf = fcoe_ctlr_select(fip);
1775                 }
1776         }
1777         if (fcf) {
1778                 fcoe_ctlr_flogi_send_locked(fip);
1779                 fip->flogi_req_send = 0;
1780         } else /* XXX */
1781                 LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
1782 unlock:
1783         spin_unlock_bh(&fip->ctlr_lock);
1784 }
1785
1786 /**
1787  * fcoe_ctlr_timeout() - FIP timeout handler
1788  * @arg: The FCoE controller that timed out
1789  */
1790 static void fcoe_ctlr_timeout(unsigned long arg)
1791 {
1792         struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
1793
1794         schedule_work(&fip->timer_work);
1795 }
1796
1797 /**
1798  * fcoe_ctlr_timer_work() - Worker thread function for timer work
1799  * @work: Handle to a FCoE controller
1800  *
1801  * Ages FCFs.  Triggers FCF selection if possible.
1802  * Sends keep-alives and resets.
1803  */
1804 static void fcoe_ctlr_timer_work(struct work_struct *work)
1805 {
1806         struct fcoe_ctlr *fip;
1807         struct fc_lport *vport;
1808         u8 *mac;
1809         u8 reset = 0;
1810         u8 send_ctlr_ka = 0;
1811         u8 send_port_ka = 0;
1812         struct fcoe_fcf *sel;
1813         struct fcoe_fcf *fcf;
1814         unsigned long next_timer;
1815
1816         fip = container_of(work, struct fcoe_ctlr, timer_work);
1817         if (fip->mode == FIP_MODE_VN2VN)
1818                 return fcoe_ctlr_vn_timeout(fip);
1819         mutex_lock(&fip->ctlr_mutex);
1820         if (fip->state == FIP_ST_DISABLED) {
1821                 mutex_unlock(&fip->ctlr_mutex);
1822                 return;
1823         }
1824
1825         fcf = fip->sel_fcf;
1826         next_timer = fcoe_ctlr_age_fcfs(fip);
1827
1828         sel = fip->sel_fcf;
1829         if (!sel && fip->sel_time) {
1830                 if (time_after_eq(jiffies, fip->sel_time)) {
1831                         sel = fcoe_ctlr_select(fip);
1832                         fip->sel_time = 0;
1833                 } else if (time_after(next_timer, fip->sel_time))
1834                         next_timer = fip->sel_time;
1835         }
1836
1837         if (sel && fip->flogi_req_send)
1838                 fcoe_ctlr_flogi_send(fip);
1839         else if (!sel && fcf)
1840                 reset = 1;
1841
1842         if (sel && !sel->fd_flags) {
1843                 if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
1844                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1845                         send_ctlr_ka = 1;
1846                 }
1847                 if (time_after(next_timer, fip->ctlr_ka_time))
1848                         next_timer = fip->ctlr_ka_time;
1849
1850                 if (time_after_eq(jiffies, fip->port_ka_time)) {
1851                         fip->port_ka_time = jiffies +
1852                                 msecs_to_jiffies(FIP_VN_KA_PERIOD);
1853                         send_port_ka = 1;
1854                 }
1855                 if (time_after(next_timer, fip->port_ka_time))
1856                         next_timer = fip->port_ka_time;
1857         }
1858         if (!list_empty(&fip->fcfs))
1859                 mod_timer(&fip->timer, next_timer);
1860         mutex_unlock(&fip->ctlr_mutex);
1861
1862         if (reset) {
1863                 fc_lport_reset(fip->lp);
1864                 /* restart things with a solicitation */
1865                 fcoe_ctlr_solicit(fip, NULL);
1866         }
1867
1868         if (send_ctlr_ka)
1869                 fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
1870
1871         if (send_port_ka) {
1872                 mutex_lock(&fip->lp->lp_mutex);
1873                 mac = fip->get_src_addr(fip->lp);
1874                 fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
1875                 list_for_each_entry(vport, &fip->lp->vports, list) {
1876                         mac = fip->get_src_addr(vport);
1877                         fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
1878                 }
1879                 mutex_unlock(&fip->lp->lp_mutex);
1880         }
1881 }
1882
1883 /**
1884  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
1885  * @recv_work: Handle to a FCoE controller
1886  */
1887 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
1888 {
1889         struct fcoe_ctlr *fip;
1890         struct sk_buff *skb;
1891
1892         fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1893         while ((skb = skb_dequeue(&fip->fip_recv_list)))
1894                 fcoe_ctlr_recv_handler(fip, skb);
1895 }
1896
1897 /**
1898  * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
1899  * @fip: The FCoE controller
1900  * @fp:  The FC frame to snoop
1901  *
1902  * Snoop potential response to FLOGI or even incoming FLOGI.
1903  *
1904  * The caller has checked that we are waiting for login as indicated
1905  * by fip->flogi_oxid != FC_XID_UNKNOWN.
1906  *
1907  * The caller is responsible for freeing the frame.
1908  * Fill in the granted_mac address.
1909  *
1910  * Return non-zero if the frame should not be delivered to libfc.
1911  */
1912 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
1913                          struct fc_frame *fp)
1914 {
1915         struct fc_frame_header *fh;
1916         u8 op;
1917         u8 *sa;
1918
1919         sa = eth_hdr(&fp->skb)->h_source;
1920         fh = fc_frame_header_get(fp);
1921         if (fh->fh_type != FC_TYPE_ELS)
1922                 return 0;
1923
1924         op = fc_frame_payload_op(fp);
1925         if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
1926             fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1927
1928                 mutex_lock(&fip->ctlr_mutex);
1929                 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
1930                         mutex_unlock(&fip->ctlr_mutex);
1931                         return -EINVAL;
1932                 }
1933                 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1934                 LIBFCOE_FIP_DBG(fip,
1935                                 "received FLOGI LS_ACC using non-FIP mode\n");
1936
1937                 /*
1938                  * FLOGI accepted.
1939                  * If the src mac addr is FC_OUI-based, then we mark the
1940                  * address_mode flag to use FC_OUI-based Ethernet DA.
1941                  * Otherwise we use the FCoE gateway addr
1942                  */
1943                 if (ether_addr_equal(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
1944                         fcoe_ctlr_map_dest(fip);
1945                 } else {
1946                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1947                         fip->map_dest = 0;
1948                 }
1949                 fip->flogi_oxid = FC_XID_UNKNOWN;
1950                 mutex_unlock(&fip->ctlr_mutex);
1951                 fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
1952         } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
1953                 /*
1954                  * Save source MAC for point-to-point responses.
1955                  */
1956                 mutex_lock(&fip->ctlr_mutex);
1957                 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
1958                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1959                         fip->map_dest = 0;
1960                         if (fip->state == FIP_ST_AUTO)
1961                                 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
1962                                                 "Setting non-FIP mode\n");
1963                         fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1964                 }
1965                 mutex_unlock(&fip->ctlr_mutex);
1966         }
1967         return 0;
1968 }
1969 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
1970
1971 /**
1972  * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
1973  * @mac:    The MAC address to convert
1974  * @scheme: The scheme to use when converting
1975  * @port:   The port indicator for converting
1976  *
1977  * Returns: u64 fc world wide name
1978  */
1979 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1980                       unsigned int scheme, unsigned int port)
1981 {
1982         u64 wwn;
1983         u64 host_mac;
1984
1985         /* The MAC is in NO, so flip only the low 48 bits */
1986         host_mac = ((u64) mac[0] << 40) |
1987                 ((u64) mac[1] << 32) |
1988                 ((u64) mac[2] << 24) |
1989                 ((u64) mac[3] << 16) |
1990                 ((u64) mac[4] << 8) |
1991                 (u64) mac[5];
1992
1993         WARN_ON(host_mac >= (1ULL << 48));
1994         wwn = host_mac | ((u64) scheme << 60);
1995         switch (scheme) {
1996         case 1:
1997                 WARN_ON(port != 0);
1998                 break;
1999         case 2:
2000                 WARN_ON(port >= 0xfff);
2001                 wwn |= (u64) port << 48;
2002                 break;
2003         default:
2004                 WARN_ON(1);
2005                 break;
2006         }
2007
2008         return wwn;
2009 }
2010 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
2011
2012 /**
2013  * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
2014  * @rdata: libfc remote port
2015  */
2016 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
2017 {
2018         return (struct fcoe_rport *)(rdata + 1);
2019 }
2020
2021 /**
2022  * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
2023  * @fip: The FCoE controller
2024  * @sub: sub-opcode for probe request, reply, or advertisement.
2025  * @dest: The destination Ethernet MAC address
2026  * @min_len: minimum size of the Ethernet payload to be sent
2027  */
2028 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
2029                               enum fip_vn2vn_subcode sub,
2030                               const u8 *dest, size_t min_len)
2031 {
2032         struct sk_buff *skb;
2033         struct fip_vn2vn_probe_frame {
2034                 struct ethhdr eth;
2035                 struct fip_header fip;
2036                 struct fip_mac_desc mac;
2037                 struct fip_wwn_desc wwnn;
2038                 struct fip_vn_desc vn;
2039         } __packed * frame;
2040         struct fip_fc4_feat *ff;
2041         struct fip_size_desc *size;
2042         u32 fcp_feat;
2043         size_t len;
2044         size_t dlen;
2045
2046         len = sizeof(*frame);
2047         dlen = 0;
2048         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
2049                 dlen = sizeof(struct fip_fc4_feat) +
2050                        sizeof(struct fip_size_desc);
2051                 len += dlen;
2052         }
2053         dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
2054         len = max(len, min_len + sizeof(struct ethhdr));
2055
2056         skb = dev_alloc_skb(len);
2057         if (!skb)
2058                 return;
2059
2060         frame = (struct fip_vn2vn_probe_frame *)skb->data;
2061         memset(frame, 0, len);
2062         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
2063
2064         if (sub == FIP_SC_VN_BEACON) {
2065                 hton24(frame->eth.h_source, FIP_VN_FC_MAP);
2066                 hton24(frame->eth.h_source + 3, fip->port_id);
2067         } else {
2068                 memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
2069         }
2070         frame->eth.h_proto = htons(ETH_P_FIP);
2071
2072         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
2073         frame->fip.fip_op = htons(FIP_OP_VN2VN);
2074         frame->fip.fip_subcode = sub;
2075         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
2076
2077         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
2078         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
2079         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
2080
2081         frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
2082         frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
2083         put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
2084
2085         frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
2086         frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
2087         hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
2088         hton24(frame->vn.fd_mac + 3, fip->port_id);
2089         hton24(frame->vn.fd_fc_id, fip->port_id);
2090         put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
2091
2092         /*
2093          * For claims, add FC-4 features.
2094          * TBD: Add interface to get fc-4 types and features from libfc.
2095          */
2096         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
2097                 ff = (struct fip_fc4_feat *)(frame + 1);
2098                 ff->fd_desc.fip_dtype = FIP_DT_FC4F;
2099                 ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
2100                 ff->fd_fts = fip->lp->fcts;
2101
2102                 fcp_feat = 0;
2103                 if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
2104                         fcp_feat |= FCP_FEAT_INIT;
2105                 if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
2106                         fcp_feat |= FCP_FEAT_TARG;
2107                 fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
2108                 ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
2109
2110                 size = (struct fip_size_desc *)(ff + 1);
2111                 size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
2112                 size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
2113                 size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
2114         }
2115
2116         skb_put(skb, len);
2117         skb->protocol = htons(ETH_P_FIP);
2118         skb->priority = fip->priority;
2119         skb_reset_mac_header(skb);
2120         skb_reset_network_header(skb);
2121
2122         fip->send(fip, skb);
2123 }
2124
2125 /**
2126  * fcoe_ctlr_vn_rport_callback - Event handler for rport events.
2127  * @lport: The lport which is receiving the event
2128  * @rdata: remote port private data
2129  * @event: The event that occurred
2130  *
2131  * Locking Note:  The rport lock must not be held when calling this function.
2132  */
2133 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
2134                                         struct fc_rport_priv *rdata,
2135                                         enum fc_rport_event event)
2136 {
2137         struct fcoe_ctlr *fip = lport->disc.priv;
2138         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2139
2140         LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
2141                         rdata->ids.port_id, event);
2142
2143         mutex_lock(&fip->ctlr_mutex);
2144         switch (event) {
2145         case RPORT_EV_READY:
2146                 frport->login_count = 0;
2147                 break;
2148         case RPORT_EV_LOGO:
2149         case RPORT_EV_FAILED:
2150         case RPORT_EV_STOP:
2151                 frport->login_count++;
2152                 if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
2153                         LIBFCOE_FIP_DBG(fip,
2154                                         "rport FLOGI limited port_id %6.6x\n",
2155                                         rdata->ids.port_id);
2156                         fc_rport_logoff(rdata);
2157                 }
2158                 break;
2159         default:
2160                 break;
2161         }
2162         mutex_unlock(&fip->ctlr_mutex);
2163 }
2164
2165 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
2166         .event_callback = fcoe_ctlr_vn_rport_callback,
2167 };
2168
2169 /**
2170  * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
2171  * @fip: The FCoE controller
2172  *
2173  * Called with ctlr_mutex held.
2174  */
2175 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
2176 {
2177         struct fc_rport_priv *rdata;
2178
2179         rcu_read_lock();
2180         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
2181                 if (kref_get_unless_zero(&rdata->kref)) {
2182                         fc_rport_logoff(rdata);
2183                         kref_put(&rdata->kref, fc_rport_destroy);
2184                 }
2185         }
2186         rcu_read_unlock();
2187         mutex_lock(&lport->disc.disc_mutex);
2188         lport->disc.disc_callback = NULL;
2189         mutex_unlock(&lport->disc.disc_mutex);
2190 }
2191
2192 /**
2193  * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
2194  * @fip: The FCoE controller
2195  *
2196  * Called through the local port template for discovery.
2197  * Called without the ctlr_mutex held.
2198  */
2199 static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
2200 {
2201         struct fcoe_ctlr *fip = lport->disc.priv;
2202
2203         mutex_lock(&fip->ctlr_mutex);
2204         fcoe_ctlr_disc_stop_locked(lport);
2205         mutex_unlock(&fip->ctlr_mutex);
2206 }
2207
2208 /**
2209  * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
2210  * @fip: The FCoE controller
2211  *
2212  * Called through the local port template for discovery.
2213  * Called without the ctlr_mutex held.
2214  */
2215 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
2216 {
2217         fcoe_ctlr_disc_stop(lport);
2218         fc_rport_flush_queue();
2219         synchronize_rcu();
2220 }
2221
2222 /**
2223  * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
2224  * @fip: The FCoE controller
2225  *
2226  * Called with fcoe_ctlr lock held.
2227  */
2228 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
2229 {
2230         unsigned long wait;
2231         u32 port_id;
2232
2233         fcoe_ctlr_disc_stop_locked(fip->lp);
2234
2235         /*
2236          * Get proposed port ID.
2237          * If this is the first try after link up, use any previous port_id.
2238          * If there was none, use the low bits of the port_name.
2239          * On subsequent tries, get the next random one.
2240          * Don't use reserved IDs, use another non-zero value, just as random.
2241          */
2242         port_id = fip->port_id;
2243         if (fip->probe_tries)
2244                 port_id = prandom_u32_state(&fip->rnd_state) & 0xffff;
2245         else if (!port_id)
2246                 port_id = fip->lp->wwpn & 0xffff;
2247         if (!port_id || port_id == 0xffff)
2248                 port_id = 1;
2249         fip->port_id = port_id;
2250
2251         if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
2252                 fip->probe_tries++;
2253                 wait = prandom_u32() % FIP_VN_PROBE_WAIT;
2254         } else
2255                 wait = FIP_VN_RLIM_INT;
2256         mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
2257         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
2258 }
2259
2260 /**
2261  * fcoe_ctlr_vn_start() - Start in VN2VN mode
2262  * @fip: The FCoE controller
2263  *
2264  * Called with fcoe_ctlr lock held.
2265  */
2266 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
2267 {
2268         fip->probe_tries = 0;
2269         prandom_seed_state(&fip->rnd_state, fip->lp->wwpn);
2270         fcoe_ctlr_vn_restart(fip);
2271 }
2272
2273 /**
2274  * fcoe_ctlr_vn_parse - parse probe request or response
2275  * @fip: The FCoE controller
2276  * @skb: incoming packet
2277  * @rdata: buffer for resulting parsed VN entry plus fcoe_rport
2278  *
2279  * Returns non-zero error number on error.
2280  * Does not consume the packet.
2281  */
2282 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
2283                               struct sk_buff *skb,
2284                               struct fc_rport_priv *rdata)
2285 {
2286         struct fip_header *fiph;
2287         struct fip_desc *desc = NULL;
2288         struct fip_mac_desc *macd = NULL;
2289         struct fip_wwn_desc *wwn = NULL;
2290         struct fip_vn_desc *vn = NULL;
2291         struct fip_size_desc *size = NULL;
2292         struct fcoe_rport *frport;
2293         size_t rlen;
2294         size_t dlen;
2295         u32 desc_mask = 0;
2296         u32 dtype;
2297         u8 sub;
2298
2299         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2300         frport = fcoe_ctlr_rport(rdata);
2301
2302         fiph = (struct fip_header *)skb->data;
2303         frport->flags = ntohs(fiph->fip_flags);
2304
2305         sub = fiph->fip_subcode;
2306         switch (sub) {
2307         case FIP_SC_VN_PROBE_REQ:
2308         case FIP_SC_VN_PROBE_REP:
2309         case FIP_SC_VN_BEACON:
2310                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2311                             BIT(FIP_DT_VN_ID);
2312                 break;
2313         case FIP_SC_VN_CLAIM_NOTIFY:
2314         case FIP_SC_VN_CLAIM_REP:
2315                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2316                             BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
2317                             BIT(FIP_DT_FCOE_SIZE);
2318                 break;
2319         default:
2320                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2321                 return -EINVAL;
2322         }
2323
2324         rlen = ntohs(fiph->fip_dl_len) * 4;
2325         if (rlen + sizeof(*fiph) > skb->len)
2326                 return -EINVAL;
2327
2328         desc = (struct fip_desc *)(fiph + 1);
2329         while (rlen > 0) {
2330                 dlen = desc->fip_dlen * FIP_BPW;
2331                 if (dlen < sizeof(*desc) || dlen > rlen)
2332                         return -EINVAL;
2333
2334                 dtype = desc->fip_dtype;
2335                 if (dtype < 32) {
2336                         if (!(desc_mask & BIT(dtype))) {
2337                                 LIBFCOE_FIP_DBG(fip,
2338                                                 "unexpected or duplicated desc "
2339                                                 "desc type %u in "
2340                                                 "FIP VN2VN subtype %u\n",
2341                                                 dtype, sub);
2342                                 return -EINVAL;
2343                         }
2344                         desc_mask &= ~BIT(dtype);
2345                 }
2346
2347                 switch (dtype) {
2348                 case FIP_DT_MAC:
2349                         if (dlen != sizeof(struct fip_mac_desc))
2350                                 goto len_err;
2351                         macd = (struct fip_mac_desc *)desc;
2352                         if (!is_valid_ether_addr(macd->fd_mac)) {
2353                                 LIBFCOE_FIP_DBG(fip,
2354                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2355                                          macd->fd_mac);
2356                                 return -EINVAL;
2357                         }
2358                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2359                         break;
2360                 case FIP_DT_NAME:
2361                         if (dlen != sizeof(struct fip_wwn_desc))
2362                                 goto len_err;
2363                         wwn = (struct fip_wwn_desc *)desc;
2364                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2365                         break;
2366                 case FIP_DT_VN_ID:
2367                         if (dlen != sizeof(struct fip_vn_desc))
2368                                 goto len_err;
2369                         vn = (struct fip_vn_desc *)desc;
2370                         memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
2371                         rdata->ids.port_id = ntoh24(vn->fd_fc_id);
2372                         rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn);
2373                         break;
2374                 case FIP_DT_FC4F:
2375                         if (dlen != sizeof(struct fip_fc4_feat))
2376                                 goto len_err;
2377                         break;
2378                 case FIP_DT_FCOE_SIZE:
2379                         if (dlen != sizeof(struct fip_size_desc))
2380                                 goto len_err;
2381                         size = (struct fip_size_desc *)desc;
2382                         frport->fcoe_len = ntohs(size->fd_size);
2383                         break;
2384                 default:
2385                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2386                                         "in FIP probe\n", dtype);
2387                         /* standard says ignore unknown descriptors >= 128 */
2388                         if (dtype < FIP_DT_NON_CRITICAL)
2389                                 return -EINVAL;
2390                         break;
2391                 }
2392                 desc = (struct fip_desc *)((char *)desc + dlen);
2393                 rlen -= dlen;
2394         }
2395         return 0;
2396
2397 len_err:
2398         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2399                         dtype, dlen);
2400         return -EINVAL;
2401 }
2402
2403 /**
2404  * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
2405  * @fip: The FCoE controller
2406  *
2407  * Called with ctlr_mutex held.
2408  */
2409 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
2410 {
2411         fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
2412         fip->sol_time = jiffies;
2413 }
2414
2415 /**
2416  * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
2417  * @fip: The FCoE controller
2418  * @rdata: parsed remote port with frport from the probe request
2419  *
2420  * Called with ctlr_mutex held.
2421  */
2422 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
2423                                    struct fc_rport_priv *rdata)
2424 {
2425         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2426
2427         if (rdata->ids.port_id != fip->port_id)
2428                 return;
2429
2430         switch (fip->state) {
2431         case FIP_ST_VNMP_CLAIM:
2432         case FIP_ST_VNMP_UP:
2433                 LIBFCOE_FIP_DBG(fip, "vn_probe_req: send reply, state %x\n",
2434                                 fip->state);
2435                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2436                                   frport->enode_mac, 0);
2437                 break;
2438         case FIP_ST_VNMP_PROBE1:
2439         case FIP_ST_VNMP_PROBE2:
2440                 /*
2441                  * Decide whether to reply to the Probe.
2442                  * Our selected address is never a "recorded" one, so
2443                  * only reply if our WWPN is greater and the
2444                  * Probe's REC bit is not set.
2445                  * If we don't reply, we will change our address.
2446                  */
2447                 if (fip->lp->wwpn > rdata->ids.port_name &&
2448                     !(frport->flags & FIP_FL_REC_OR_P2P)) {
2449                         LIBFCOE_FIP_DBG(fip, "vn_probe_req: "
2450                                         "port_id collision\n");
2451                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2452                                           frport->enode_mac, 0);
2453                         break;
2454                 }
2455                 /* fall through */
2456         case FIP_ST_VNMP_START:
2457                 LIBFCOE_FIP_DBG(fip, "vn_probe_req: "
2458                                 "restart VN2VN negotiation\n");
2459                 fcoe_ctlr_vn_restart(fip);
2460                 break;
2461         default:
2462                 LIBFCOE_FIP_DBG(fip, "vn_probe_req: ignore state %x\n",
2463                                 fip->state);
2464                 break;
2465         }
2466 }
2467
2468 /**
2469  * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
2470  * @fip: The FCoE controller
2471  * @rdata: parsed remote port with frport from the probe request
2472  *
2473  * Called with ctlr_mutex held.
2474  */
2475 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
2476                                    struct fc_rport_priv *rdata)
2477 {
2478         if (rdata->ids.port_id != fip->port_id)
2479                 return;
2480         switch (fip->state) {
2481         case FIP_ST_VNMP_START:
2482         case FIP_ST_VNMP_PROBE1:
2483         case FIP_ST_VNMP_PROBE2:
2484         case FIP_ST_VNMP_CLAIM:
2485                 LIBFCOE_FIP_DBG(fip, "vn_probe_reply: restart state %x\n",
2486                                 fip->state);
2487                 fcoe_ctlr_vn_restart(fip);
2488                 break;
2489         case FIP_ST_VNMP_UP:
2490                 LIBFCOE_FIP_DBG(fip, "vn_probe_reply: send claim notify\n");
2491                 fcoe_ctlr_vn_send_claim(fip);
2492                 break;
2493         default:
2494                 break;
2495         }
2496 }
2497
2498 /**
2499  * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
2500  * @fip: The FCoE controller
2501  * @new: newly-parsed remote port with frport as a template for new rdata
2502  *
2503  * Called with ctlr_mutex held.
2504  */
2505 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new)
2506 {
2507         struct fc_lport *lport = fip->lp;
2508         struct fc_rport_priv *rdata;
2509         struct fc_rport_identifiers *ids;
2510         struct fcoe_rport *frport;
2511         u32 port_id;
2512
2513         port_id = new->ids.port_id;
2514         if (port_id == fip->port_id)
2515                 return;
2516
2517         mutex_lock(&lport->disc.disc_mutex);
2518         rdata = fc_rport_create(lport, port_id);
2519         if (!rdata) {
2520                 mutex_unlock(&lport->disc.disc_mutex);
2521                 return;
2522         }
2523         mutex_lock(&rdata->rp_mutex);
2524         mutex_unlock(&lport->disc.disc_mutex);
2525
2526         rdata->ops = &fcoe_ctlr_vn_rport_ops;
2527         rdata->disc_id = lport->disc.disc_id;
2528
2529         ids = &rdata->ids;
2530         if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) ||
2531             (ids->node_name != -1 && ids->node_name != new->ids.node_name)) {
2532                 mutex_unlock(&rdata->rp_mutex);
2533                 LIBFCOE_FIP_DBG(fip, "vn_add rport logoff %6.6x\n", port_id);
2534                 fc_rport_logoff(rdata);
2535                 mutex_lock(&rdata->rp_mutex);
2536         }
2537         ids->port_name = new->ids.port_name;
2538         ids->node_name = new->ids.node_name;
2539         mutex_unlock(&rdata->rp_mutex);
2540
2541         frport = fcoe_ctlr_rport(rdata);
2542         LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s state %d\n",
2543                         port_id, frport->fcoe_len ? "old" : "new",
2544                         rdata->rp_state);
2545         *frport = *fcoe_ctlr_rport(new);
2546         frport->time = 0;
2547 }
2548
2549 /**
2550  * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
2551  * @fip: The FCoE controller
2552  * @port_id:  The port_id of the remote VN_node
2553  * @mac: buffer which will hold the VN_NODE destination MAC address, if found.
2554  *
2555  * Returns non-zero error if no remote port found.
2556  */
2557 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
2558 {
2559         struct fc_lport *lport = fip->lp;
2560         struct fc_rport_priv *rdata;
2561         struct fcoe_rport *frport;
2562         int ret = -1;
2563
2564         rdata = fc_rport_lookup(lport, port_id);
2565         if (rdata) {
2566                 frport = fcoe_ctlr_rport(rdata);
2567                 memcpy(mac, frport->enode_mac, ETH_ALEN);
2568                 ret = 0;
2569                 kref_put(&rdata->kref, fc_rport_destroy);
2570         }
2571         return ret;
2572 }
2573
2574 /**
2575  * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
2576  * @fip: The FCoE controller
2577  * @new: newly-parsed remote port with frport as a template for new rdata
2578  *
2579  * Called with ctlr_mutex held.
2580  */
2581 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
2582                                       struct fc_rport_priv *new)
2583 {
2584         struct fcoe_rport *frport = fcoe_ctlr_rport(new);
2585
2586         if (frport->flags & FIP_FL_REC_OR_P2P) {
2587                 LIBFCOE_FIP_DBG(fip, "send probe req for P2P/REC\n");
2588                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2589                 return;
2590         }
2591         switch (fip->state) {
2592         case FIP_ST_VNMP_START:
2593         case FIP_ST_VNMP_PROBE1:
2594         case FIP_ST_VNMP_PROBE2:
2595                 if (new->ids.port_id == fip->port_id) {
2596                         LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
2597                                         "restart, state %d\n",
2598                                         fip->state);
2599                         fcoe_ctlr_vn_restart(fip);
2600                 }
2601                 break;
2602         case FIP_ST_VNMP_CLAIM:
2603         case FIP_ST_VNMP_UP:
2604                 if (new->ids.port_id == fip->port_id) {
2605                         if (new->ids.port_name > fip->lp->wwpn) {
2606                                 LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
2607                                                 "restart, port_id collision\n");
2608                                 fcoe_ctlr_vn_restart(fip);
2609                                 break;
2610                         }
2611                         LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
2612                                         "send claim notify\n");
2613                         fcoe_ctlr_vn_send_claim(fip);
2614                         break;
2615                 }
2616                 LIBFCOE_FIP_DBG(fip, "vn_claim_notify: send reply to %x\n",
2617                                 new->ids.port_id);
2618                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac,
2619                                   min((u32)frport->fcoe_len,
2620                                       fcoe_ctlr_fcoe_size(fip)));
2621                 fcoe_ctlr_vn_add(fip, new);
2622                 break;
2623         default:
2624                 LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
2625                                 "ignoring claim from %x\n", new->ids.port_id);
2626                 break;
2627         }
2628 }
2629
2630 /**
2631  * fcoe_ctlr_vn_claim_resp() - handle received Claim Response
2632  * @fip: The FCoE controller that received the frame
2633  * @new: newly-parsed remote port with frport from the Claim Response
2634  *
2635  * Called with ctlr_mutex held.
2636  */
2637 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
2638                                     struct fc_rport_priv *new)
2639 {
2640         LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
2641                         new->ids.port_id, fcoe_ctlr_state(fip->state));
2642         if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
2643                 fcoe_ctlr_vn_add(fip, new);
2644 }
2645
2646 /**
2647  * fcoe_ctlr_vn_beacon() - handle received beacon.
2648  * @fip: The FCoE controller that received the frame
2649  * @new: newly-parsed remote port with frport from the Beacon
2650  *
2651  * Called with ctlr_mutex held.
2652  */
2653 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
2654                                 struct fc_rport_priv *new)
2655 {
2656         struct fc_lport *lport = fip->lp;
2657         struct fc_rport_priv *rdata;
2658         struct fcoe_rport *frport;
2659
2660         frport = fcoe_ctlr_rport(new);
2661         if (frport->flags & FIP_FL_REC_OR_P2P) {
2662                 LIBFCOE_FIP_DBG(fip, "p2p beacon while in vn2vn mode\n");
2663                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2664                 return;
2665         }
2666         rdata = fc_rport_lookup(lport, new->ids.port_id);
2667         if (rdata) {
2668                 if (rdata->ids.node_name == new->ids.node_name &&
2669                     rdata->ids.port_name == new->ids.port_name) {
2670                         frport = fcoe_ctlr_rport(rdata);
2671                         LIBFCOE_FIP_DBG(fip, "beacon from rport %x\n",
2672                                         rdata->ids.port_id);
2673                         if (!frport->time && fip->state == FIP_ST_VNMP_UP) {
2674                                 LIBFCOE_FIP_DBG(fip, "beacon expired "
2675                                                 "for rport %x\n",
2676                                                 rdata->ids.port_id);
2677                                 fc_rport_login(rdata);
2678                         }
2679                         frport->time = jiffies;
2680                 }
2681                 kref_put(&rdata->kref, fc_rport_destroy);
2682                 return;
2683         }
2684         if (fip->state != FIP_ST_VNMP_UP)
2685                 return;
2686
2687         /*
2688          * Beacon from a new neighbor.
2689          * Send a claim notify if one hasn't been sent recently.
2690          * Don't add the neighbor yet.
2691          */
2692         LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
2693                         new->ids.port_id);
2694         if (time_after(jiffies,
2695                        fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
2696                 fcoe_ctlr_vn_send_claim(fip);
2697 }
2698
2699 /**
2700  * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
2701  * @fip: The FCoE controller
2702  *
2703  * Called with ctlr_mutex held.
2704  * Called only in state FIP_ST_VNMP_UP.
2705  * Returns the soonest time for next age-out or a time far in the future.
2706  */
2707 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
2708 {
2709         struct fc_lport *lport = fip->lp;
2710         struct fc_rport_priv *rdata;
2711         struct fcoe_rport *frport;
2712         unsigned long next_time;
2713         unsigned long deadline;
2714
2715         next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
2716         rcu_read_lock();
2717         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
2718                 if (!kref_get_unless_zero(&rdata->kref))
2719                         continue;
2720                 frport = fcoe_ctlr_rport(rdata);
2721                 if (!frport->time) {
2722                         kref_put(&rdata->kref, fc_rport_destroy);
2723                         continue;
2724                 }
2725                 deadline = frport->time +
2726                            msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
2727                 if (time_after_eq(jiffies, deadline)) {
2728                         frport->time = 0;
2729                         LIBFCOE_FIP_DBG(fip,
2730                                 "port %16.16llx fc_id %6.6x beacon expired\n",
2731                                 rdata->ids.port_name, rdata->ids.port_id);
2732                         fc_rport_logoff(rdata);
2733                 } else if (time_before(deadline, next_time))
2734                         next_time = deadline;
2735                 kref_put(&rdata->kref, fc_rport_destroy);
2736         }
2737         rcu_read_unlock();
2738         return next_time;
2739 }
2740
2741 /**
2742  * fcoe_ctlr_vn_recv() - Receive a FIP frame
2743  * @fip: The FCoE controller that received the frame
2744  * @skb: The received FIP frame
2745  *
2746  * Returns non-zero if the frame is dropped.
2747  * Always consumes the frame.
2748  */
2749 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2750 {
2751         struct fip_header *fiph;
2752         enum fip_vn2vn_subcode sub;
2753         struct {
2754                 struct fc_rport_priv rdata;
2755                 struct fcoe_rport frport;
2756         } buf;
2757         int rc, vlan_id = 0;
2758
2759         fiph = (struct fip_header *)skb->data;
2760         sub = fiph->fip_subcode;
2761
2762         if (fip->lp->vlan)
2763                 vlan_id = skb_vlan_tag_get_id(skb);
2764
2765         if (vlan_id && vlan_id != fip->lp->vlan) {
2766                 LIBFCOE_FIP_DBG(fip, "vn_recv drop frame sub %x vlan %d\n",
2767                                 sub, vlan_id);
2768                 rc = -EAGAIN;
2769                 goto drop;
2770         }
2771
2772         rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata);
2773         if (rc) {
2774                 LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
2775                 goto drop;
2776         }
2777
2778         mutex_lock(&fip->ctlr_mutex);
2779         switch (sub) {
2780         case FIP_SC_VN_PROBE_REQ:
2781                 fcoe_ctlr_vn_probe_req(fip, &buf.rdata);
2782                 break;
2783         case FIP_SC_VN_PROBE_REP:
2784                 fcoe_ctlr_vn_probe_reply(fip, &buf.rdata);
2785                 break;
2786         case FIP_SC_VN_CLAIM_NOTIFY:
2787                 fcoe_ctlr_vn_claim_notify(fip, &buf.rdata);
2788                 break;
2789         case FIP_SC_VN_CLAIM_REP:
2790                 fcoe_ctlr_vn_claim_resp(fip, &buf.rdata);
2791                 break;
2792         case FIP_SC_VN_BEACON:
2793                 fcoe_ctlr_vn_beacon(fip, &buf.rdata);
2794                 break;
2795         default:
2796                 LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
2797                 rc = -1;
2798                 break;
2799         }
2800         mutex_unlock(&fip->ctlr_mutex);
2801 drop:
2802         kfree_skb(skb);
2803         return rc;
2804 }
2805
2806 /**
2807  * fcoe_ctlr_vlan_parse - parse vlan discovery request or response
2808  * @fip: The FCoE controller
2809  * @skb: incoming packet
2810  * @rdata: buffer for resulting parsed VLAN entry plus fcoe_rport
2811  *
2812  * Returns non-zero error number on error.
2813  * Does not consume the packet.
2814  */
2815 static int fcoe_ctlr_vlan_parse(struct fcoe_ctlr *fip,
2816                               struct sk_buff *skb,
2817                               struct fc_rport_priv *rdata)
2818 {
2819         struct fip_header *fiph;
2820         struct fip_desc *desc = NULL;
2821         struct fip_mac_desc *macd = NULL;
2822         struct fip_wwn_desc *wwn = NULL;
2823         struct fcoe_rport *frport;
2824         size_t rlen;
2825         size_t dlen;
2826         u32 desc_mask = 0;
2827         u32 dtype;
2828         u8 sub;
2829
2830         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2831         frport = fcoe_ctlr_rport(rdata);
2832
2833         fiph = (struct fip_header *)skb->data;
2834         frport->flags = ntohs(fiph->fip_flags);
2835
2836         sub = fiph->fip_subcode;
2837         switch (sub) {
2838         case FIP_SC_VL_REQ:
2839                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
2840                 break;
2841         default:
2842                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2843                 return -EINVAL;
2844         }
2845
2846         rlen = ntohs(fiph->fip_dl_len) * 4;
2847         if (rlen + sizeof(*fiph) > skb->len)
2848                 return -EINVAL;
2849
2850         desc = (struct fip_desc *)(fiph + 1);
2851         while (rlen > 0) {
2852                 dlen = desc->fip_dlen * FIP_BPW;
2853                 if (dlen < sizeof(*desc) || dlen > rlen)
2854                         return -EINVAL;
2855
2856                 dtype = desc->fip_dtype;
2857                 if (dtype < 32) {
2858                         if (!(desc_mask & BIT(dtype))) {
2859                                 LIBFCOE_FIP_DBG(fip,
2860                                                 "unexpected or duplicated desc "
2861                                                 "desc type %u in "
2862                                                 "FIP VN2VN subtype %u\n",
2863                                                 dtype, sub);
2864                                 return -EINVAL;
2865                         }
2866                         desc_mask &= ~BIT(dtype);
2867                 }
2868
2869                 switch (dtype) {
2870                 case FIP_DT_MAC:
2871                         if (dlen != sizeof(struct fip_mac_desc))
2872                                 goto len_err;
2873                         macd = (struct fip_mac_desc *)desc;
2874                         if (!is_valid_ether_addr(macd->fd_mac)) {
2875                                 LIBFCOE_FIP_DBG(fip,
2876                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2877                                          macd->fd_mac);
2878                                 return -EINVAL;
2879                         }
2880                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2881                         break;
2882                 case FIP_DT_NAME:
2883                         if (dlen != sizeof(struct fip_wwn_desc))
2884                                 goto len_err;
2885                         wwn = (struct fip_wwn_desc *)desc;
2886                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2887                         break;
2888                 default:
2889                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2890                                         "in FIP probe\n", dtype);
2891                         /* standard says ignore unknown descriptors >= 128 */
2892                         if (dtype < FIP_DT_NON_CRITICAL)
2893                                 return -EINVAL;
2894                         break;
2895                 }
2896                 desc = (struct fip_desc *)((char *)desc + dlen);
2897                 rlen -= dlen;
2898         }
2899         return 0;
2900
2901 len_err:
2902         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2903                         dtype, dlen);
2904         return -EINVAL;
2905 }
2906
2907 /**
2908  * fcoe_ctlr_vlan_send() - Send a FIP VLAN Notification
2909  * @fip: The FCoE controller
2910  * @sub: sub-opcode for vlan notification or vn2vn vlan notification
2911  * @dest: The destination Ethernet MAC address
2912  * @min_len: minimum size of the Ethernet payload to be sent
2913  */
2914 static void fcoe_ctlr_vlan_send(struct fcoe_ctlr *fip,
2915                               enum fip_vlan_subcode sub,
2916                               const u8 *dest)
2917 {
2918         struct sk_buff *skb;
2919         struct fip_vlan_notify_frame {
2920                 struct ethhdr eth;
2921                 struct fip_header fip;
2922                 struct fip_mac_desc mac;
2923                 struct fip_vlan_desc vlan;
2924         } __packed * frame;
2925         size_t len;
2926         size_t dlen;
2927
2928         len = sizeof(*frame);
2929         dlen = sizeof(frame->mac) + sizeof(frame->vlan);
2930         len = max(len, sizeof(struct ethhdr));
2931
2932         skb = dev_alloc_skb(len);
2933         if (!skb)
2934                 return;
2935
2936         LIBFCOE_FIP_DBG(fip, "fip %s vlan notification, vlan %d\n",
2937                         fip->mode == FIP_MODE_VN2VN ? "vn2vn" : "fcf",
2938                         fip->lp->vlan);
2939
2940         frame = (struct fip_vlan_notify_frame *)skb->data;
2941         memset(frame, 0, len);
2942         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
2943
2944         memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
2945         frame->eth.h_proto = htons(ETH_P_FIP);
2946
2947         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
2948         frame->fip.fip_op = htons(FIP_OP_VLAN);
2949         frame->fip.fip_subcode = sub;
2950         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
2951
2952         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
2953         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
2954         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
2955
2956         frame->vlan.fd_desc.fip_dtype = FIP_DT_VLAN;
2957         frame->vlan.fd_desc.fip_dlen = sizeof(frame->vlan) / FIP_BPW;
2958         put_unaligned_be16(fip->lp->vlan, &frame->vlan.fd_vlan);
2959
2960         skb_put(skb, len);
2961         skb->protocol = htons(ETH_P_FIP);
2962         skb->priority = fip->priority;
2963         skb_reset_mac_header(skb);
2964         skb_reset_network_header(skb);
2965
2966         fip->send(fip, skb);
2967 }
2968
2969 /**
2970  * fcoe_ctlr_vlan_disk_reply() - send FIP VLAN Discovery Notification.
2971  * @fip: The FCoE controller
2972  *
2973  * Called with ctlr_mutex held.
2974  */
2975 static void fcoe_ctlr_vlan_disc_reply(struct fcoe_ctlr *fip,
2976                                       struct fc_rport_priv *rdata)
2977 {
2978         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2979         enum fip_vlan_subcode sub = FIP_SC_VL_NOTE;
2980
2981         if (fip->mode == FIP_MODE_VN2VN)
2982                 sub = FIP_SC_VL_VN2VN_NOTE;
2983
2984         fcoe_ctlr_vlan_send(fip, sub, frport->enode_mac);
2985 }
2986
2987 /**
2988  * fcoe_ctlr_vlan_recv - vlan request receive handler for VN2VN mode.
2989  * @lport: The local port
2990  * @fp: The received frame
2991  *
2992  */
2993 static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2994 {
2995         struct fip_header *fiph;
2996         enum fip_vlan_subcode sub;
2997         struct {
2998                 struct fc_rport_priv rdata;
2999                 struct fcoe_rport frport;
3000         } buf;
3001         int rc;
3002
3003         fiph = (struct fip_header *)skb->data;
3004         sub = fiph->fip_subcode;
3005         rc = fcoe_ctlr_vlan_parse(fip, skb, &buf.rdata);
3006         if (rc) {
3007                 LIBFCOE_FIP_DBG(fip, "vlan_recv vlan_parse error %d\n", rc);
3008                 goto drop;
3009         }
3010         mutex_lock(&fip->ctlr_mutex);
3011         if (sub == FIP_SC_VL_REQ)
3012                 fcoe_ctlr_vlan_disc_reply(fip, &buf.rdata);
3013         mutex_unlock(&fip->ctlr_mutex);
3014
3015 drop:
3016         kfree_skb(skb);
3017         return rc;
3018 }
3019
3020 /**
3021  * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
3022  * @lport: The local port
3023  * @fp: The received frame
3024  *
3025  * This should never be called since we don't see RSCNs or other
3026  * fabric-generated ELSes.
3027  */
3028 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
3029 {
3030         struct fc_seq_els_data rjt_data;
3031
3032         rjt_data.reason = ELS_RJT_UNSUP;
3033         rjt_data.explan = ELS_EXPL_NONE;
3034         fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
3035         fc_frame_free(fp);
3036 }
3037
3038 /**
3039  * fcoe_ctlr_disc_recv - start discovery for VN2VN mode.
3040  * @fip: The FCoE controller
3041  *
3042  * This sets a flag indicating that remote ports should be created
3043  * and started for the peers we discover.  We use the disc_callback
3044  * pointer as that flag.  Peers already discovered are created here.
3045  *
3046  * The lport lock is held during this call. The callback must be done
3047  * later, without holding either the lport or discovery locks.
3048  * The fcoe_ctlr lock may also be held during this call.
3049  */
3050 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
3051                                                   enum fc_disc_event),
3052                                  struct fc_lport *lport)
3053 {
3054         struct fc_disc *disc = &lport->disc;
3055         struct fcoe_ctlr *fip = disc->priv;
3056
3057         mutex_lock(&disc->disc_mutex);
3058         disc->disc_callback = callback;
3059         disc->disc_id = (disc->disc_id + 2) | 1;
3060         disc->pending = 1;
3061         schedule_work(&fip->timer_work);
3062         mutex_unlock(&disc->disc_mutex);
3063 }
3064
3065 /**
3066  * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
3067  * @fip: The FCoE controller
3068  *
3069  * Starts the FLOGI and PLOGI login process to each discovered rport for which
3070  * we've received at least one beacon.
3071  * Performs the discovery complete callback.
3072  */
3073 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
3074 {
3075         struct fc_lport *lport = fip->lp;
3076         struct fc_disc *disc = &lport->disc;
3077         struct fc_rport_priv *rdata;
3078         struct fcoe_rport *frport;
3079         void (*callback)(struct fc_lport *, enum fc_disc_event);
3080
3081         mutex_lock(&disc->disc_mutex);
3082         callback = disc->pending ? disc->disc_callback : NULL;
3083         disc->pending = 0;
3084         mutex_unlock(&disc->disc_mutex);
3085         rcu_read_lock();
3086         list_for_each_entry_rcu(rdata, &disc->rports, peers) {
3087                 if (!kref_get_unless_zero(&rdata->kref))
3088                         continue;
3089                 frport = fcoe_ctlr_rport(rdata);
3090                 if (frport->time)
3091                         fc_rport_login(rdata);
3092                 kref_put(&rdata->kref, fc_rport_destroy);
3093         }
3094         rcu_read_unlock();
3095         if (callback)
3096                 callback(lport, DISC_EV_SUCCESS);
3097 }
3098
3099 /**
3100  * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
3101  * @fip: The FCoE controller
3102  */
3103 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
3104 {
3105         unsigned long next_time;
3106         u8 mac[ETH_ALEN];
3107         u32 new_port_id = 0;
3108
3109         mutex_lock(&fip->ctlr_mutex);
3110         switch (fip->state) {
3111         case FIP_ST_VNMP_START:
3112                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
3113                 LIBFCOE_FIP_DBG(fip, "vn_timeout: send 1st probe request\n");
3114                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
3115                 next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
3116                 break;
3117         case FIP_ST_VNMP_PROBE1:
3118                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
3119                 LIBFCOE_FIP_DBG(fip, "vn_timeout: send 2nd probe request\n");
3120                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
3121                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
3122                 break;
3123         case FIP_ST_VNMP_PROBE2:
3124                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
3125                 new_port_id = fip->port_id;
3126                 hton24(mac, FIP_VN_FC_MAP);
3127                 hton24(mac + 3, new_port_id);
3128                 fcoe_ctlr_map_dest(fip);
3129                 fip->update_mac(fip->lp, mac);
3130                 LIBFCOE_FIP_DBG(fip, "vn_timeout: send claim notify\n");
3131                 fcoe_ctlr_vn_send_claim(fip);
3132                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
3133                 break;
3134         case FIP_ST_VNMP_CLAIM:
3135                 /*
3136                  * This may be invoked either by starting discovery so don't
3137                  * go to the next state unless it's been long enough.
3138                  */
3139                 next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
3140                 if (time_after_eq(jiffies, next_time)) {
3141                         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
3142                         LIBFCOE_FIP_DBG(fip, "vn_timeout: send vn2vn beacon\n");
3143                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
3144                                           fcoe_all_vn2vn, 0);
3145                         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
3146                         fip->port_ka_time = next_time;
3147                 }
3148                 fcoe_ctlr_vn_disc(fip);
3149                 break;
3150         case FIP_ST_VNMP_UP:
3151                 next_time = fcoe_ctlr_vn_age(fip);
3152                 if (time_after_eq(jiffies, fip->port_ka_time)) {
3153                         LIBFCOE_FIP_DBG(fip, "vn_timeout: send vn2vn beacon\n");
3154                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
3155                                           fcoe_all_vn2vn, 0);
3156                         fip->port_ka_time = jiffies +
3157                                  msecs_to_jiffies(FIP_VN_BEACON_INT +
3158                                         (prandom_u32() % FIP_VN_BEACON_FUZZ));
3159                 }
3160                 if (time_before(fip->port_ka_time, next_time))
3161                         next_time = fip->port_ka_time;
3162                 break;
3163         case FIP_ST_LINK_WAIT:
3164                 goto unlock;
3165         default:
3166                 WARN(1, "unexpected state %d\n", fip->state);
3167                 goto unlock;
3168         }
3169         mod_timer(&fip->timer, next_time);
3170 unlock:
3171         mutex_unlock(&fip->ctlr_mutex);
3172
3173         /* If port ID is new, notify local port after dropping ctlr_mutex */
3174         if (new_port_id)
3175                 fc_lport_set_local_id(fip->lp, new_port_id);
3176 }
3177
3178 /**
3179  * fcoe_ctlr_mode_set() - Set or reset the ctlr's mode
3180  * @lport: The local port to be (re)configured
3181  * @fip:   The FCoE controller whose mode is changing
3182  * @fip_mode: The new fip mode
3183  *
3184  * Note that the we shouldn't be changing the libfc discovery settings
3185  * (fc_disc_config) while an lport is going through the libfc state
3186  * machine. The mode can only be changed when a fcoe_ctlr device is
3187  * disabled, so that should ensure that this routine is only called
3188  * when nothing is happening.
3189  */
3190 static void fcoe_ctlr_mode_set(struct fc_lport *lport, struct fcoe_ctlr *fip,
3191                                enum fip_mode fip_mode)
3192 {
3193         void *priv;
3194
3195         WARN_ON(lport->state != LPORT_ST_RESET &&
3196                 lport->state != LPORT_ST_DISABLED);
3197
3198         if (fip_mode == FIP_MODE_VN2VN) {
3199                 lport->rport_priv_size = sizeof(struct fcoe_rport);
3200                 lport->point_to_multipoint = 1;
3201                 lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
3202                 lport->tt.disc_start = fcoe_ctlr_disc_start;
3203                 lport->tt.disc_stop = fcoe_ctlr_disc_stop;
3204                 lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
3205                 priv = fip;
3206         } else {
3207                 lport->rport_priv_size = 0;
3208                 lport->point_to_multipoint = 0;
3209                 lport->tt.disc_recv_req = NULL;
3210                 lport->tt.disc_start = NULL;
3211                 lport->tt.disc_stop = NULL;
3212                 lport->tt.disc_stop_final = NULL;
3213                 priv = lport;
3214         }
3215
3216         fc_disc_config(lport, priv);
3217 }
3218
3219 /**
3220  * fcoe_libfc_config() - Sets up libfc related properties for local port
3221  * @lport:    The local port to configure libfc for
3222  * @fip:      The FCoE controller in use by the local port
3223  * @tt:       The libfc function template
3224  * @init_fcp: If non-zero, the FCP portion of libfc should be initialized
3225  *
3226  * Returns : 0 for success
3227  */
3228 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
3229                       const struct libfc_function_template *tt, int init_fcp)
3230 {
3231         /* Set the function pointers set by the LLDD */
3232         memcpy(&lport->tt, tt, sizeof(*tt));
3233         if (init_fcp && fc_fcp_init(lport))
3234                 return -ENOMEM;
3235         fc_exch_init(lport);
3236         fc_elsct_init(lport);
3237         fc_lport_init(lport);
3238         fc_disc_init(lport);
3239         fcoe_ctlr_mode_set(lport, fip, fip->mode);
3240         return 0;
3241 }
3242 EXPORT_SYMBOL_GPL(fcoe_libfc_config);
3243
3244 void fcoe_fcf_get_selected(struct fcoe_fcf_device *fcf_dev)
3245 {
3246         struct fcoe_ctlr_device *ctlr_dev = fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
3247         struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
3248         struct fcoe_fcf *fcf;
3249
3250         mutex_lock(&fip->ctlr_mutex);
3251         mutex_lock(&ctlr_dev->lock);
3252
3253         fcf = fcoe_fcf_device_priv(fcf_dev);
3254         if (fcf)
3255                 fcf_dev->selected = (fcf == fip->sel_fcf) ? 1 : 0;
3256         else
3257                 fcf_dev->selected = 0;
3258
3259         mutex_unlock(&ctlr_dev->lock);
3260         mutex_unlock(&fip->ctlr_mutex);
3261 }
3262 EXPORT_SYMBOL(fcoe_fcf_get_selected);
3263
3264 void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *ctlr_dev)
3265 {
3266         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
3267         struct fc_lport *lport = ctlr->lp;
3268
3269         mutex_lock(&ctlr->ctlr_mutex);
3270         switch (ctlr_dev->mode) {
3271         case FIP_CONN_TYPE_VN2VN:
3272                 ctlr->mode = FIP_MODE_VN2VN;
3273                 break;
3274         case FIP_CONN_TYPE_FABRIC:
3275         default:
3276                 ctlr->mode = FIP_MODE_FABRIC;
3277                 break;
3278         }
3279
3280         mutex_unlock(&ctlr->ctlr_mutex);
3281
3282         fcoe_ctlr_mode_set(lport, ctlr, ctlr->mode);
3283 }
3284 EXPORT_SYMBOL(fcoe_ctlr_set_fip_mode);