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