drivers/scsi/fcoe/fcoe_ctlr.c

   1 /*
   2  * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright (c) 2009 Intel Corporation.  All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Maintained at www.Open-FCoE.org
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/list.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/timer.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/if_vlan.h>
  32 #include <linux/errno.h>
  33 #include <linux/bitops.h>
  34 #include <linux/slab.h>
  35 #include <net/rtnetlink.h>
  36
  37 #include <scsi/fc/fc_els.h>
  38 #include <scsi/fc/fc_fs.h>
  39 #include <scsi/fc/fc_fip.h>
  40 #include <scsi/fc/fc_encaps.h>
  41 #include <scsi/fc/fc_fcoe.h>
  42 #include <scsi/fc/fc_fcp.h>
  43
  44 #include <scsi/libfc.h>
  45 #include <scsi/libfcoe.h>
  46
  47 #include "libfcoe.h"
  48
  49 #define FCOE_CTLR_MIN_FKA       500             /* min keep alive (mS) */
  50 #define FCOE_CTLR_DEF_FKA       FIP_DEF_FKA     /* default keep alive (mS) */
  51
  52 static void fcoe_ctlr_timeout(unsigned long);
  53 static void fcoe_ctlr_timer_work(struct work_struct *);
  54 static void fcoe_ctlr_recv_work(struct work_struct *);
  55 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *);
  56
  57 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *);
  58 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *, struct sk_buff *);
  59 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *);
  60 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *, u32, u8 *);
  61
  62 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
  63 static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS;
  64 static u8 fcoe_all_vn2vn[ETH_ALEN] = FIP_ALL_VN2VN_MACS;
  65 static u8 fcoe_all_p2p[ETH_ALEN] = FIP_ALL_P2P_MACS;
  66
  67 static const char * const fcoe_ctlr_states[] = {
  68         [FIP_ST_DISABLED] =     "DISABLED",
  69         [FIP_ST_LINK_WAIT] =    "LINK_WAIT",
  70         [FIP_ST_AUTO] =         "AUTO",
  71         [FIP_ST_NON_FIP] =      "NON_FIP",
  72         [FIP_ST_ENABLED] =      "ENABLED",
  73         [FIP_ST_VNMP_START] =   "VNMP_START",
  74         [FIP_ST_VNMP_PROBE1] =  "VNMP_PROBE1",
  75         [FIP_ST_VNMP_PROBE2] =  "VNMP_PROBE2",
  76         [FIP_ST_VNMP_CLAIM] =   "VNMP_CLAIM",
  77         [FIP_ST_VNMP_UP] =      "VNMP_UP",
  78 };
  79
  80 static const char *fcoe_ctlr_state(enum fip_state state)
  81 {
  82         const char *cp = "unknown";
  83
  84         if (state < ARRAY_SIZE(fcoe_ctlr_states))
  85                 cp = fcoe_ctlr_states[state];
  86         if (!cp)
  87                 cp = "unknown";
  88         return cp;
  89 }
  90
  91 /**
  92  * fcoe_ctlr_set_state() - Set and do debug printing for the new FIP state.
  93  * @fip: The FCoE controller
  94  * @state: The new state
  95  */
  96 static void fcoe_ctlr_set_state(struct fcoe_ctlr *fip, enum fip_state state)
  97 {
  98         if (state == fip->state)
  99                 return;
 100         if (fip->lp)
 101                 LIBFCOE_FIP_DBG(fip, "state %s -> %s\n",
 102                         fcoe_ctlr_state(fip->state), fcoe_ctlr_state(state));
 103         fip->state = state;
 104 }
 105
 106 /**
 107  * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
 108  * @fcf: The FCF to check
 109  *
 110  * Return non-zero if FCF fcoe_size has been validated.
 111  */
 112 static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
 113 {
 114         return (fcf->flags & FIP_FL_SOL) != 0;
 115 }
 116
 117 /**
 118  * fcoe_ctlr_fcf_usable() - Check if a FCF is usable
 119  * @fcf: The FCF to check
 120  *
 121  * Return non-zero if the FCF is usable.
 122  */
 123 static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
 124 {
 125         u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
 126
 127         return (fcf->flags & flags) == flags;
 128 }
 129
 130 /**
 131  * fcoe_ctlr_map_dest() - Set flag and OUI for mapping destination addresses
 132  * @fip: The FCoE controller
 133  */
 134 static void fcoe_ctlr_map_dest(struct fcoe_ctlr *fip)
 135 {
 136         if (fip->mode == FIP_MODE_VN2VN)
 137                 hton24(fip->dest_addr, FIP_VN_FC_MAP);
 138         else
 139                 hton24(fip->dest_addr, FIP_DEF_FC_MAP);
 140         hton24(fip->dest_addr + 3, 0);
 141         fip->map_dest = 1;
 142 }
 143
 144 /**
 145  * fcoe_ctlr_init() - Initialize the FCoE Controller instance
 146  * @fip: The FCoE controller to initialize
 147  */
 148 void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_state mode)
 149 {
 150         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
 151         fip->mode = mode;
 152         INIT_LIST_HEAD(&fip->fcfs);
 153         mutex_init(&fip->ctlr_mutex);
 154         spin_lock_init(&fip->ctlr_lock);
 155         fip->flogi_oxid = FC_XID_UNKNOWN;
 156         setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
 157         INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
 158         INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
 159         skb_queue_head_init(&fip->fip_recv_list);
 160 }
 161 EXPORT_SYMBOL(fcoe_ctlr_init);
 162
 163 /**
 164  * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
 165  * @fip: The FCoE controller whose FCFs are to be reset
 166  *
 167  * Called with &fcoe_ctlr lock held.
 168  */
 169 static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
 170 {
 171         struct fcoe_fcf *fcf;
 172         struct fcoe_fcf *next;
 173
 174         fip->sel_fcf = NULL;
 175         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 176                 list_del(&fcf->list);
 177                 kfree(fcf);
 178         }
 179         fip->fcf_count = 0;
 180         fip->sel_time = 0;
 181 }
 182
 183 /**
 184  * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
 185  * @fip: The FCoE controller to tear down
 186  *
 187  * This is called by FCoE drivers before freeing the &fcoe_ctlr.
 188  *
 189  * The receive handler will have been deleted before this to guarantee
 190  * that no more recv_work will be scheduled.
 191  *
 192  * The timer routine will simply return once we set FIP_ST_DISABLED.
 193  * This guarantees that no further timeouts or work will be scheduled.
 194  */
 195 void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
 196 {
 197         cancel_work_sync(&fip->recv_work);
 198         skb_queue_purge(&fip->fip_recv_list);
 199
 200         mutex_lock(&fip->ctlr_mutex);
 201         fcoe_ctlr_set_state(fip, FIP_ST_DISABLED);
 202         fcoe_ctlr_reset_fcfs(fip);
 203         mutex_unlock(&fip->ctlr_mutex);
 204         del_timer_sync(&fip->timer);
 205         cancel_work_sync(&fip->timer_work);
 206 }
 207 EXPORT_SYMBOL(fcoe_ctlr_destroy);
 208
 209 /**
 210  * fcoe_ctlr_announce() - announce new FCF selection
 211  * @fip: The FCoE controller
 212  *
 213  * Also sets the destination MAC for FCoE and control packets
 214  *
 215  * Called with neither ctlr_mutex nor ctlr_lock held.
 216  */
 217 static void fcoe_ctlr_announce(struct fcoe_ctlr *fip)
 218 {
 219         struct fcoe_fcf *sel;
 220         struct fcoe_fcf *fcf;
 221
 222         mutex_lock(&fip->ctlr_mutex);
 223         spin_lock_bh(&fip->ctlr_lock);
 224
 225         kfree_skb(fip->flogi_req);
 226         fip->flogi_req = NULL;
 227         list_for_each_entry(fcf, &fip->fcfs, list)
 228                 fcf->flogi_sent = 0;
 229
 230         spin_unlock_bh(&fip->ctlr_lock);
 231         sel = fip->sel_fcf;
 232
 233         if (sel && !compare_ether_addr(sel->fcf_mac, fip->dest_addr))
 234                 goto unlock;
 235         if (!is_zero_ether_addr(fip->dest_addr)) {
 236                 printk(KERN_NOTICE "libfcoe: host%d: "
 237                        "FIP Fibre-Channel Forwarder MAC %pM deselected\n",
 238                        fip->lp->host->host_no, fip->dest_addr);
 239                 memset(fip->dest_addr, 0, ETH_ALEN);
 240         }
 241         if (sel) {
 242                 printk(KERN_INFO "libfcoe: host%d: FIP selected "
 243                        "Fibre-Channel Forwarder MAC %pM\n",
 244                        fip->lp->host->host_no, sel->fcf_mac);
 245                 memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN);
 246                 fip->map_dest = 0;
 247         }
 248 unlock:
 249         mutex_unlock(&fip->ctlr_mutex);
 250 }
 251
 252 /**
 253  * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
 254  * @fip: The FCoE controller to get the maximum FCoE size from
 255  *
 256  * Returns the maximum packet size including the FCoE header and trailer,
 257  * but not including any Ethernet or VLAN headers.
 258  */
 259 static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
 260 {
 261         /*
 262          * Determine the max FCoE frame size allowed, including
 263          * FCoE header and trailer.
 264          * Note:  lp->mfs is currently the payload size, not the frame size.
 265          */
 266         return fip->lp->mfs + sizeof(struct fc_frame_header) +
 267                 sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
 268 }
 269
 270 /**
 271  * fcoe_ctlr_solicit() - Send a FIP solicitation
 272  * @fip: The FCoE controller to send the solicitation on
 273  * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
 274  */
 275 static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
 276 {
 277         struct sk_buff *skb;
 278         struct fip_sol {
 279                 struct ethhdr eth;
 280                 struct fip_header fip;
 281                 struct {
 282                         struct fip_mac_desc mac;
 283                         struct fip_wwn_desc wwnn;
 284                         struct fip_size_desc size;
 285                 } __packed desc;
 286         }  __packed * sol;
 287         u32 fcoe_size;
 288
 289         skb = dev_alloc_skb(sizeof(*sol));
 290         if (!skb)
 291                 return;
 292
 293         sol = (struct fip_sol *)skb->data;
 294
 295         memset(sol, 0, sizeof(*sol));
 296         memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
 297         memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 298         sol->eth.h_proto = htons(ETH_P_FIP);
 299
 300         sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 301         sol->fip.fip_op = htons(FIP_OP_DISC);
 302         sol->fip.fip_subcode = FIP_SC_SOL;
 303         sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
 304         sol->fip.fip_flags = htons(FIP_FL_FPMA);
 305         if (fip->spma)
 306                 sol->fip.fip_flags |= htons(FIP_FL_SPMA);
 307
 308         sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
 309         sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
 310         memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 311
 312         sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
 313         sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
 314         put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
 315
 316         fcoe_size = fcoe_ctlr_fcoe_size(fip);
 317         sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
 318         sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
 319         sol->desc.size.fd_size = htons(fcoe_size);
 320
 321         skb_put(skb, sizeof(*sol));
 322         skb->protocol = htons(ETH_P_FIP);
 323         skb_reset_mac_header(skb);
 324         skb_reset_network_header(skb);
 325         fip->send(fip, skb);
 326
 327         if (!fcf)
 328                 fip->sol_time = jiffies;
 329 }
 330
 331 /**
 332  * fcoe_ctlr_link_up() - Start FCoE controller
 333  * @fip: The FCoE controller to start
 334  *
 335  * Called from the LLD when the network link is ready.
 336  */
 337 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
 338 {
 339         mutex_lock(&fip->ctlr_mutex);
 340         if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
 341                 mutex_unlock(&fip->ctlr_mutex);
 342                 fc_linkup(fip->lp);
 343         } else if (fip->state == FIP_ST_LINK_WAIT) {
 344                 fcoe_ctlr_set_state(fip, fip->mode);
 345                 switch (fip->mode) {
 346                 default:
 347                         LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode);
 348                         /* fall-through */
 349                 case FIP_MODE_AUTO:
 350                         LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
 351                         /* fall-through */
 352                 case FIP_MODE_FABRIC:
 353                 case FIP_MODE_NON_FIP:
 354                         mutex_unlock(&fip->ctlr_mutex);
 355                         fc_linkup(fip->lp);
 356                         fcoe_ctlr_solicit(fip, NULL);
 357                         break;
 358                 case FIP_MODE_VN2VN:
 359                         fcoe_ctlr_vn_start(fip);
 360                         mutex_unlock(&fip->ctlr_mutex);
 361                         fc_linkup(fip->lp);
 362                         break;
 363                 }
 364         } else
 365                 mutex_unlock(&fip->ctlr_mutex);
 366 }
 367 EXPORT_SYMBOL(fcoe_ctlr_link_up);
 368
 369 /**
 370  * fcoe_ctlr_reset() - Reset a FCoE controller
 371  * @fip:       The FCoE controller to reset
 372  */
 373 static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
 374 {
 375         fcoe_ctlr_reset_fcfs(fip);
 376         del_timer(&fip->timer);
 377         fip->ctlr_ka_time = 0;
 378         fip->port_ka_time = 0;
 379         fip->sol_time = 0;
 380         fip->flogi_oxid = FC_XID_UNKNOWN;
 381         fcoe_ctlr_map_dest(fip);
 382 }
 383
 384 /**
 385  * fcoe_ctlr_link_down() - Stop a FCoE controller
 386  * @fip: The FCoE controller to be stopped
 387  *
 388  * Returns non-zero if the link was up and now isn't.
 389  *
 390  * Called from the LLD when the network link is not ready.
 391  * There may be multiple calls while the link is down.
 392  */
 393 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
 394 {
 395         int link_dropped;
 396
 397         LIBFCOE_FIP_DBG(fip, "link down.\n");
 398         mutex_lock(&fip->ctlr_mutex);
 399         fcoe_ctlr_reset(fip);
 400         link_dropped = fip->state != FIP_ST_LINK_WAIT;
 401         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
 402         mutex_unlock(&fip->ctlr_mutex);
 403
 404         if (link_dropped)
 405                 fc_linkdown(fip->lp);
 406         return link_dropped;
 407 }
 408 EXPORT_SYMBOL(fcoe_ctlr_link_down);
 409
 410 /**
 411  * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
 412  * @fip:   The FCoE controller to send the FKA on
 413  * @lport: libfc fc_lport to send from
 414  * @ports: 0 for controller keep-alive, 1 for port keep-alive
 415  * @sa:    The source MAC address
 416  *
 417  * A controller keep-alive is sent every fka_period (typically 8 seconds).
 418  * The source MAC is the native MAC address.
 419  *
 420  * A port keep-alive is sent every 90 seconds while logged in.
 421  * The source MAC is the assigned mapped source address.
 422  * The destination is the FCF's F-port.
 423  */
 424 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
 425                                       struct fc_lport *lport,
 426                                       int ports, u8 *sa)
 427 {
 428         struct sk_buff *skb;
 429         struct fip_kal {
 430                 struct ethhdr eth;
 431                 struct fip_header fip;
 432                 struct fip_mac_desc mac;
 433         } __packed * kal;
 434         struct fip_vn_desc *vn;
 435         u32 len;
 436         struct fc_lport *lp;
 437         struct fcoe_fcf *fcf;
 438
 439         fcf = fip->sel_fcf;
 440         lp = fip->lp;
 441         if (!fcf || (ports && !lp->port_id))
 442                 return;
 443
 444         len = sizeof(*kal) + ports * sizeof(*vn);
 445         skb = dev_alloc_skb(len);
 446         if (!skb)
 447                 return;
 448
 449         kal = (struct fip_kal *)skb->data;
 450         memset(kal, 0, len);
 451         memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 452         memcpy(kal->eth.h_source, sa, ETH_ALEN);
 453         kal->eth.h_proto = htons(ETH_P_FIP);
 454
 455         kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 456         kal->fip.fip_op = htons(FIP_OP_CTRL);
 457         kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
 458         kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
 459                                      ports * sizeof(*vn)) / FIP_BPW);
 460         kal->fip.fip_flags = htons(FIP_FL_FPMA);
 461         if (fip->spma)
 462                 kal->fip.fip_flags |= htons(FIP_FL_SPMA);
 463
 464         kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
 465         kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
 466         memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 467         if (ports) {
 468                 vn = (struct fip_vn_desc *)(kal + 1);
 469                 vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
 470                 vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
 471                 memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
 472                 hton24(vn->fd_fc_id, lport->port_id);
 473                 put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
 474         }
 475         skb_put(skb, len);
 476         skb->protocol = htons(ETH_P_FIP);
 477         skb_reset_mac_header(skb);
 478         skb_reset_network_header(skb);
 479         fip->send(fip, skb);
 480 }
 481
 482 /**
 483  * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
 484  * @fip:   The FCoE controller for the ELS frame
 485  * @dtype: The FIP descriptor type for the frame
 486  * @skb:   The FCoE ELS frame including FC header but no FCoE headers
 487  * @d_id:  The destination port ID.
 488  *
 489  * Returns non-zero error code on failure.
 490  *
 491  * The caller must check that the length is a multiple of 4.
 492  *
 493  * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
 494  * Headroom includes the FIP encapsulation description, FIP header, and
 495  * Ethernet header.  The tailroom is for the FIP MAC descriptor.
 496  */
 497 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
 498                             u8 dtype, struct sk_buff *skb, u32 d_id)
 499 {
 500         struct fip_encaps_head {
 501                 struct ethhdr eth;
 502                 struct fip_header fip;
 503                 struct fip_encaps encaps;
 504         } __packed * cap;
 505         struct fc_frame_header *fh;
 506         struct fip_mac_desc *mac;
 507         struct fcoe_fcf *fcf;
 508         size_t dlen;
 509         u16 fip_flags;
 510         u8 op;
 511
 512         fh = (struct fc_frame_header *)skb->data;
 513         op = *(u8 *)(fh + 1);
 514         dlen = sizeof(struct fip_encaps) + skb->len;    /* len before push */
 515         cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));
 516         memset(cap, 0, sizeof(*cap));
 517
 518         if (lport->point_to_multipoint) {
 519                 if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest))
 520                         return -ENODEV;
 521                 fip_flags = 0;
 522         } else {
 523                 fcf = fip->sel_fcf;
 524                 if (!fcf)
 525                         return -ENODEV;
 526                 fip_flags = fcf->flags;
 527                 fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA :
 528                                          FIP_FL_FPMA;
 529                 if (!fip_flags)
 530                         return -ENODEV;
 531                 memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 532         }
 533         memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 534         cap->eth.h_proto = htons(ETH_P_FIP);
 535
 536         cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 537         cap->fip.fip_op = htons(FIP_OP_LS);
 538         if (op == ELS_LS_ACC || op == ELS_LS_RJT)
 539                 cap->fip.fip_subcode = FIP_SC_REP;
 540         else
 541                 cap->fip.fip_subcode = FIP_SC_REQ;
 542         cap->fip.fip_flags = htons(fip_flags);
 543
 544         cap->encaps.fd_desc.fip_dtype = dtype;
 545         cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
 546
 547         if (op != ELS_LS_RJT) {
 548                 dlen += sizeof(*mac);
 549                 mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
 550                 memset(mac, 0, sizeof(*mac));
 551                 mac->fd_desc.fip_dtype = FIP_DT_MAC;
 552                 mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
 553                 if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
 554                         memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
 555                 } else if (fip->mode == FIP_MODE_VN2VN) {
 556                         hton24(mac->fd_mac, FIP_VN_FC_MAP);
 557                         hton24(mac->fd_mac + 3, fip->port_id);
 558                 } else if (fip_flags & FIP_FL_SPMA) {
 559                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
 560                         memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
 561                 } else {
 562                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
 563                         /* FPMA only FLOGI.  Must leave the MAC desc zeroed. */
 564                 }
 565         }
 566         cap->fip.fip_dl_len = htons(dlen / FIP_BPW);
 567
 568         skb->protocol = htons(ETH_P_FIP);
 569         skb_reset_mac_header(skb);
 570         skb_reset_network_header(skb);
 571         return 0;
 572 }
 573
 574 /**
 575  * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
 576  * @fip:        FCoE controller.
 577  * @lport:      libfc fc_lport to send from
 578  * @skb:        FCoE ELS frame including FC header but no FCoE headers.
 579  *
 580  * Returns a non-zero error code if the frame should not be sent.
 581  * Returns zero if the caller should send the frame with FCoE encapsulation.
 582  *
 583  * The caller must check that the length is a multiple of 4.
 584  * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
 585  * The the skb must also be an fc_frame.
 586  *
 587  * This is called from the lower-level driver with spinlocks held,
 588  * so we must not take a mutex here.
 589  */
 590 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
 591                        struct sk_buff *skb)
 592 {
 593         struct fc_frame *fp;
 594         struct fc_frame_header *fh;
 595         u16 old_xid;
 596         u8 op;
 597         u8 mac[ETH_ALEN];
 598
 599         fp = container_of(skb, struct fc_frame, skb);
 600         fh = (struct fc_frame_header *)skb->data;
 601         op = *(u8 *)(fh + 1);
 602
 603         if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) {
 604                 old_xid = fip->flogi_oxid;
 605                 fip->flogi_oxid = ntohs(fh->fh_ox_id);
 606                 if (fip->state == FIP_ST_AUTO) {
 607                         if (old_xid == FC_XID_UNKNOWN)
 608                                 fip->flogi_count = 0;
 609                         fip->flogi_count++;
 610                         if (fip->flogi_count < 3)
 611                                 goto drop;
 612                         fcoe_ctlr_map_dest(fip);
 613                         return 0;
 614                 }
 615                 if (fip->state == FIP_ST_NON_FIP)
 616                         fcoe_ctlr_map_dest(fip);
 617         }
 618
 619         if (fip->state == FIP_ST_NON_FIP)
 620                 return 0;
 621         if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN)
 622                 goto drop;
 623         switch (op) {
 624         case ELS_FLOGI:
 625                 op = FIP_DT_FLOGI;
 626                 if (fip->mode == FIP_MODE_VN2VN)
 627                         break;
 628                 spin_lock_bh(&fip->ctlr_lock);
 629                 kfree_skb(fip->flogi_req);
 630                 fip->flogi_req = skb;
 631                 fip->flogi_req_send = 1;
 632                 spin_unlock_bh(&fip->ctlr_lock);
 633                 schedule_work(&fip->timer_work);
 634                 return -EINPROGRESS;
 635         case ELS_FDISC:
 636                 if (ntoh24(fh->fh_s_id))
 637                         return 0;
 638                 op = FIP_DT_FDISC;
 639                 break;
 640         case ELS_LOGO:
 641                 if (fip->mode == FIP_MODE_VN2VN) {
 642                         if (fip->state != FIP_ST_VNMP_UP)
 643                                 return -EINVAL;
 644                         if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI)
 645                                 return -EINVAL;
 646                 } else {
 647                         if (fip->state != FIP_ST_ENABLED)
 648                                 return 0;
 649                         if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
 650                                 return 0;
 651                 }
 652                 op = FIP_DT_LOGO;
 653                 break;
 654         case ELS_LS_ACC:
 655                 /*
 656                  * If non-FIP, we may have gotten an SID by accepting an FLOGI
 657                  * from a point-to-point connection.  Switch to using
 658                  * the source mac based on the SID.  The destination
 659                  * MAC in this case would have been set by receiving the
 660                  * FLOGI.
 661                  */
 662                 if (fip->state == FIP_ST_NON_FIP) {
 663                         if (fip->flogi_oxid == FC_XID_UNKNOWN)
 664                                 return 0;
 665                         fip->flogi_oxid = FC_XID_UNKNOWN;
 666                         fc_fcoe_set_mac(mac, fh->fh_d_id);
 667                         fip->update_mac(lport, mac);
 668                 }
 669                 /* fall through */
 670         case ELS_LS_RJT:
 671                 op = fr_encaps(fp);
 672                 if (op)
 673                         break;
 674                 return 0;
 675         default:
 676                 if (fip->state != FIP_ST_ENABLED &&
 677                     fip->state != FIP_ST_VNMP_UP)
 678                         goto drop;
 679                 return 0;
 680         }
 681         LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n",
 682                         op, ntoh24(fh->fh_d_id));
 683         if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id)))
 684                 goto drop;
 685         fip->send(fip, skb);
 686         return -EINPROGRESS;
 687 drop:
 688         kfree_skb(skb);
 689         return -EINVAL;
 690 }
 691 EXPORT_SYMBOL(fcoe_ctlr_els_send);
 692
 693 /**
 694  * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
 695  * @fip: The FCoE controller to free FCFs on
 696  *
 697  * Called with lock held and preemption disabled.
 698  *
 699  * An FCF is considered old if we have missed two advertisements.
 700  * That is, there have been no valid advertisement from it for 2.5
 701  * times its keep-alive period.
 702  *
 703  * In addition, determine the time when an FCF selection can occur.
 704  *
 705  * Also, increment the MissDiscAdvCount when no advertisement is received
 706  * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
 707  *
 708  * Returns the time in jiffies for the next call.
 709  */
 710 static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
 711 {
 712         struct fcoe_fcf *fcf;
 713         struct fcoe_fcf *next;
 714         unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
 715         unsigned long deadline;
 716         unsigned long sel_time = 0;
 717         struct fcoe_dev_stats *stats;
 718
 719         stats = per_cpu_ptr(fip->lp->dev_stats, get_cpu());
 720
 721         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 722                 deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
 723                 if (fip->sel_fcf == fcf) {
 724                         if (time_after(jiffies, deadline)) {
 725                                 stats->MissDiscAdvCount++;
 726                                 printk(KERN_INFO "libfcoe: host%d: "
 727                                        "Missing Discovery Advertisement "
 728                                        "for fab %16.16llx count %lld\n",
 729                                        fip->lp->host->host_no, fcf->fabric_name,
 730                                        stats->MissDiscAdvCount);
 731                         } else if (time_after(next_timer, deadline))
 732                                 next_timer = deadline;
 733                 }
 734
 735                 deadline += fcf->fka_period;
 736                 if (time_after_eq(jiffies, deadline)) {
 737                         if (fip->sel_fcf == fcf)
 738                                 fip->sel_fcf = NULL;
 739                         list_del(&fcf->list);
 740                         WARN_ON(!fip->fcf_count);
 741                         fip->fcf_count--;
 742                         kfree(fcf);
 743                         stats->VLinkFailureCount++;
 744                 } else {
 745                         if (time_after(next_timer, deadline))
 746                                 next_timer = deadline;
 747                         if (fcoe_ctlr_mtu_valid(fcf) &&
 748                             (!sel_time || time_before(sel_time, fcf->time)))
 749                                 sel_time = fcf->time;
 750                 }
 751         }
 752         put_cpu();
 753         if (sel_time && !fip->sel_fcf && !fip->sel_time) {
 754                 sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
 755                 fip->sel_time = sel_time;
 756         }
 757
 758         return next_timer;
 759 }
 760
 761 /**
 762  * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
 763  * @fip: The FCoE controller receiving the advertisement
 764  * @skb: The received FIP advertisement frame
 765  * @fcf: The resulting FCF entry
 766  *
 767  * Returns zero on a valid parsed advertisement,
 768  * otherwise returns non zero value.
 769  */
 770 static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
 771                                struct sk_buff *skb, struct fcoe_fcf *fcf)
 772 {
 773         struct fip_header *fiph;
 774         struct fip_desc *desc = NULL;
 775         struct fip_wwn_desc *wwn;
 776         struct fip_fab_desc *fab;
 777         struct fip_fka_desc *fka;
 778         unsigned long t;
 779         size_t rlen;
 780         size_t dlen;
 781         u32 desc_mask;
 782
 783         memset(fcf, 0, sizeof(*fcf));
 784         fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
 785
 786         fiph = (struct fip_header *)skb->data;
 787         fcf->flags = ntohs(fiph->fip_flags);
 788
 789         /*
 790          * mask of required descriptors. validating each one clears its bit.
 791          */
 792         desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
 793                         BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA);
 794
 795         rlen = ntohs(fiph->fip_dl_len) * 4;
 796         if (rlen + sizeof(*fiph) > skb->len)
 797                 return -EINVAL;
 798
 799         desc = (struct fip_desc *)(fiph + 1);
 800         while (rlen > 0) {
 801                 dlen = desc->fip_dlen * FIP_BPW;
 802                 if (dlen < sizeof(*desc) || dlen > rlen)
 803                         return -EINVAL;
 804                 /* Drop Adv if there are duplicate critical descriptors */
 805                 if ((desc->fip_dtype < 32) &&
 806                     !(desc_mask & 1U << desc->fip_dtype)) {
 807                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
 808                                         "Descriptors in FIP adv\n");
 809                         return -EINVAL;
 810                 }
 811                 switch (desc->fip_dtype) {
 812                 case FIP_DT_PRI:
 813                         if (dlen != sizeof(struct fip_pri_desc))
 814                                 goto len_err;
 815                         fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
 816                         desc_mask &= ~BIT(FIP_DT_PRI);
 817                         break;
 818                 case FIP_DT_MAC:
 819                         if (dlen != sizeof(struct fip_mac_desc))
 820                                 goto len_err;
 821                         memcpy(fcf->fcf_mac,
 822                                ((struct fip_mac_desc *)desc)->fd_mac,
 823                                ETH_ALEN);
 824                         if (!is_valid_ether_addr(fcf->fcf_mac)) {
 825                                 LIBFCOE_FIP_DBG(fip,
 826                                         "Invalid MAC addr %pM in FIP adv\n",
 827                                         fcf->fcf_mac);
 828                                 return -EINVAL;
 829                         }
 830                         desc_mask &= ~BIT(FIP_DT_MAC);
 831                         break;
 832                 case FIP_DT_NAME:
 833                         if (dlen != sizeof(struct fip_wwn_desc))
 834                                 goto len_err;
 835                         wwn = (struct fip_wwn_desc *)desc;
 836                         fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
 837                         desc_mask &= ~BIT(FIP_DT_NAME);
 838                         break;
 839                 case FIP_DT_FAB:
 840                         if (dlen != sizeof(struct fip_fab_desc))
 841                                 goto len_err;
 842                         fab = (struct fip_fab_desc *)desc;
 843                         fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
 844                         fcf->vfid = ntohs(fab->fd_vfid);
 845                         fcf->fc_map = ntoh24(fab->fd_map);
 846                         desc_mask &= ~BIT(FIP_DT_FAB);
 847                         break;
 848                 case FIP_DT_FKA:
 849                         if (dlen != sizeof(struct fip_fka_desc))
 850                                 goto len_err;
 851                         fka = (struct fip_fka_desc *)desc;
 852                         if (fka->fd_flags & FIP_FKA_ADV_D)
 853                                 fcf->fd_flags = 1;
 854                         t = ntohl(fka->fd_fka_period);
 855                         if (t >= FCOE_CTLR_MIN_FKA)
 856                                 fcf->fka_period = msecs_to_jiffies(t);
 857                         desc_mask &= ~BIT(FIP_DT_FKA);
 858                         break;
 859                 case FIP_DT_MAP_OUI:
 860                 case FIP_DT_FCOE_SIZE:
 861                 case FIP_DT_FLOGI:
 862                 case FIP_DT_FDISC:
 863                 case FIP_DT_LOGO:
 864                 case FIP_DT_ELP:
 865                 default:
 866                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
 867                                         "in FIP adv\n", desc->fip_dtype);
 868                         /* standard says ignore unknown descriptors >= 128 */
 869                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
 870                                 return -EINVAL;
 871                         break;
 872                 }
 873                 desc = (struct fip_desc *)((char *)desc + dlen);
 874                 rlen -= dlen;
 875         }
 876         if (!fcf->fc_map || (fcf->fc_map & 0x10000))
 877                 return -EINVAL;
 878         if (!fcf->switch_name)
 879                 return -EINVAL;
 880         if (desc_mask) {
 881                 LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n",
 882                                 desc_mask);
 883                 return -EINVAL;
 884         }
 885         return 0;
 886
 887 len_err:
 888         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
 889                         desc->fip_dtype, dlen);
 890         return -EINVAL;
 891 }
 892
 893 /**
 894  * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
 895  * @fip: The FCoE controller receiving the advertisement
 896  * @skb: The received FIP packet
 897  */
 898 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
 899 {
 900         struct fcoe_fcf *fcf;
 901         struct fcoe_fcf new;
 902         struct fcoe_fcf *found;
 903         unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
 904         int first = 0;
 905         int mtu_valid;
 906
 907         if (fcoe_ctlr_parse_adv(fip, skb, &new))
 908                 return;
 909
 910         mutex_lock(&fip->ctlr_mutex);
 911         first = list_empty(&fip->fcfs);
 912         found = NULL;
 913         list_for_each_entry(fcf, &fip->fcfs, list) {
 914                 if (fcf->switch_name == new.switch_name &&
 915                     fcf->fabric_name == new.fabric_name &&
 916                     fcf->fc_map == new.fc_map &&
 917                     compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) {
 918                         found = fcf;
 919                         break;
 920                 }
 921         }
 922         if (!found) {
 923                 if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
 924                         goto out;
 925
 926                 fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
 927                 if (!fcf)
 928                         goto out;
 929
 930                 fip->fcf_count++;
 931                 memcpy(fcf, &new, sizeof(new));
 932                 list_add(&fcf->list, &fip->fcfs);
 933         } else {
 934                 /*
 935                  * Update the FCF's keep-alive descriptor flags.
 936                  * Other flag changes from new advertisements are
 937                  * ignored after a solicited advertisement is
 938                  * received and the FCF is selectable (usable).
 939                  */
 940                 fcf->fd_flags = new.fd_flags;
 941                 if (!fcoe_ctlr_fcf_usable(fcf))
 942                         fcf->flags = new.flags;
 943
 944                 if (fcf == fip->sel_fcf && !fcf->fd_flags) {
 945                         fip->ctlr_ka_time -= fcf->fka_period;
 946                         fip->ctlr_ka_time += new.fka_period;
 947                         if (time_before(fip->ctlr_ka_time, fip->timer.expires))
 948                                 mod_timer(&fip->timer, fip->ctlr_ka_time);
 949                 }
 950                 fcf->fka_period = new.fka_period;
 951                 memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
 952         }
 953         mtu_valid = fcoe_ctlr_mtu_valid(fcf);
 954         fcf->time = jiffies;
 955         if (!found)
 956                 LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
 957                                 fcf->fabric_name, fcf->fcf_mac);
 958
 959         /*
 960          * If this advertisement is not solicited and our max receive size
 961          * hasn't been verified, send a solicited advertisement.
 962          */
 963         if (!mtu_valid)
 964                 fcoe_ctlr_solicit(fip, fcf);
 965
 966         /*
 967          * If its been a while since we did a solicit, and this is
 968          * the first advertisement we've received, do a multicast
 969          * solicitation to gather as many advertisements as we can
 970          * before selection occurs.
 971          */
 972         if (first && time_after(jiffies, fip->sol_time + sol_tov))
 973                 fcoe_ctlr_solicit(fip, NULL);
 974
 975         /*
 976          * Put this FCF at the head of the list for priority among equals.
 977          * This helps in the case of an NPV switch which insists we use
 978          * the FCF that answers multicast solicitations, not the others that
 979          * are sending periodic multicast advertisements.
 980          */
 981         if (mtu_valid)
 982                 list_move(&fcf->list, &fip->fcfs);
 983
 984         /*
 985          * If this is the first validated FCF, note the time and
 986          * set a timer to trigger selection.
 987          */
 988         if (mtu_valid && !fip->sel_fcf && fcoe_ctlr_fcf_usable(fcf)) {
 989                 fip->sel_time = jiffies +
 990                         msecs_to_jiffies(FCOE_CTLR_START_DELAY);
 991                 if (!timer_pending(&fip->timer) ||
 992                     time_before(fip->sel_time, fip->timer.expires))
 993                         mod_timer(&fip->timer, fip->sel_time);
 994         }
 995 out:
 996         mutex_unlock(&fip->ctlr_mutex);
 997 }
 998
 999 /**
1000  * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
1001  * @fip: The FCoE controller which received the packet
1002  * @skb: The received FIP packet
1003  */
1004 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
1005 {
1006         struct fc_lport *lport = fip->lp;
1007         struct fip_header *fiph;
1008         struct fc_frame *fp = (struct fc_frame *)skb;
1009         struct fc_frame_header *fh = NULL;
1010         struct fip_desc *desc;
1011         struct fip_encaps *els;
1012         struct fcoe_dev_stats *stats;
1013         enum fip_desc_type els_dtype = 0;
1014         u8 els_op;
1015         u8 sub;
1016         u8 granted_mac[ETH_ALEN] = { 0 };
1017         size_t els_len = 0;
1018         size_t rlen;
1019         size_t dlen;
1020         u32 desc_mask = 0;
1021         u32 desc_cnt = 0;
1022
1023         fiph = (struct fip_header *)skb->data;
1024         sub = fiph->fip_subcode;
1025         if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
1026                 goto drop;
1027
1028         rlen = ntohs(fiph->fip_dl_len) * 4;
1029         if (rlen + sizeof(*fiph) > skb->len)
1030                 goto drop;
1031
1032         desc = (struct fip_desc *)(fiph + 1);
1033         while (rlen > 0) {
1034                 desc_cnt++;
1035                 dlen = desc->fip_dlen * FIP_BPW;
1036                 if (dlen < sizeof(*desc) || dlen > rlen)
1037                         goto drop;
1038                 /* Drop ELS if there are duplicate critical descriptors */
1039                 if (desc->fip_dtype < 32) {
1040                         if (desc_mask & 1U << desc->fip_dtype) {
1041                                 LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1042                                                 "Descriptors in FIP ELS\n");
1043                                 goto drop;
1044                         }
1045                         desc_mask |= (1 << desc->fip_dtype);
1046                 }
1047                 switch (desc->fip_dtype) {
1048                 case FIP_DT_MAC:
1049                         if (desc_cnt == 1) {
1050                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1051                                                 "received out of order\n");
1052                                 goto drop;
1053                         }
1054
1055                         if (dlen != sizeof(struct fip_mac_desc))
1056                                 goto len_err;
1057                         memcpy(granted_mac,
1058                                ((struct fip_mac_desc *)desc)->fd_mac,
1059                                ETH_ALEN);
1060                         break;
1061                 case FIP_DT_FLOGI:
1062                 case FIP_DT_FDISC:
1063                 case FIP_DT_LOGO:
1064                 case FIP_DT_ELP:
1065                         if (desc_cnt != 1) {
1066                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1067                                                 "received out of order\n");
1068                                 goto drop;
1069                         }
1070                         if (fh)
1071                                 goto drop;
1072                         if (dlen < sizeof(*els) + sizeof(*fh) + 1)
1073                                 goto len_err;
1074                         els_len = dlen - sizeof(*els);
1075                         els = (struct fip_encaps *)desc;
1076                         fh = (struct fc_frame_header *)(els + 1);
1077                         els_dtype = desc->fip_dtype;
1078                         break;
1079                 default:
1080                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
1081                                         "in FIP adv\n", desc->fip_dtype);
1082                         /* standard says ignore unknown descriptors >= 128 */
1083                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1084                                 goto drop;
1085                         if (desc_cnt <= 2) {
1086                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1087                                                 "received out of order\n");
1088                                 goto drop;
1089                         }
1090                         break;
1091                 }
1092                 desc = (struct fip_desc *)((char *)desc + dlen);
1093                 rlen -= dlen;
1094         }
1095
1096         if (!fh)
1097                 goto drop;
1098         els_op = *(u8 *)(fh + 1);
1099
1100         if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) &&
1101             sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) {
1102                 if (els_op == ELS_LS_ACC) {
1103                         if (!is_valid_ether_addr(granted_mac)) {
1104                                 LIBFCOE_FIP_DBG(fip,
1105                                         "Invalid MAC address %pM in FIP ELS\n",
1106                                         granted_mac);
1107                                 goto drop;
1108                         }
1109                         memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
1110
1111                         if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1112                                 fip->flogi_oxid = FC_XID_UNKNOWN;
1113                                 if (els_dtype == FIP_DT_FLOGI)
1114                                         fcoe_ctlr_announce(fip);
1115                         }
1116                 } else if (els_dtype == FIP_DT_FLOGI &&
1117                            !fcoe_ctlr_flogi_retry(fip))
1118                         goto drop;      /* retrying FLOGI so drop reject */
1119         }
1120
1121         if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
1122             (!(1U << FIP_DT_MAC & desc_mask)))) {
1123                 LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
1124                                 "in FIP ELS\n");
1125                 goto drop;
1126         }
1127
1128         /*
1129          * Convert skb into an fc_frame containing only the ELS.
1130          */
1131         skb_pull(skb, (u8 *)fh - skb->data);
1132         skb_trim(skb, els_len);
1133         fp = (struct fc_frame *)skb;
1134         fc_frame_init(fp);
1135         fr_sof(fp) = FC_SOF_I3;
1136         fr_eof(fp) = FC_EOF_T;
1137         fr_dev(fp) = lport;
1138         fr_encaps(fp) = els_dtype;
1139
1140         stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1141         stats->RxFrames++;
1142         stats->RxWords += skb->len / FIP_BPW;
1143         put_cpu();
1144
1145         fc_exch_recv(lport, fp);
1146         return;
1147
1148 len_err:
1149         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1150                         desc->fip_dtype, dlen);
1151 drop:
1152         kfree_skb(skb);
1153 }
1154
1155 /**
1156  * fcoe_ctlr_recv_els() - Handle an incoming link reset frame
1157  * @fip: The FCoE controller that received the frame
1158  * @fh:  The received FIP header
1159  *
1160  * There may be multiple VN_Port descriptors.
1161  * The overall length has already been checked.
1162  */
1163 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
1164                                      struct fip_header *fh)
1165 {
1166         struct fip_desc *desc;
1167         struct fip_mac_desc *mp;
1168         struct fip_wwn_desc *wp;
1169         struct fip_vn_desc *vp;
1170         size_t rlen;
1171         size_t dlen;
1172         struct fcoe_fcf *fcf = fip->sel_fcf;
1173         struct fc_lport *lport = fip->lp;
1174         struct fc_lport *vn_port = NULL;
1175         u32 desc_mask;
1176         int num_vlink_desc;
1177         int reset_phys_port = 0;
1178         struct fip_vn_desc **vlink_desc_arr = NULL;
1179
1180         LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
1181
1182         if (!fcf || !lport->port_id)
1183                 return;
1184
1185         /*
1186          * mask of required descriptors.  Validating each one clears its bit.
1187          */
1188         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
1189
1190         rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
1191         desc = (struct fip_desc *)(fh + 1);
1192
1193         /*
1194          * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
1195          * before determining max Vx_Port descriptor but a buggy FCF could have
1196          * omited either or both MAC Address and Name Identifier descriptors
1197          */
1198         num_vlink_desc = rlen / sizeof(*vp);
1199         if (num_vlink_desc)
1200                 vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc,
1201                                          GFP_ATOMIC);
1202         if (!vlink_desc_arr)
1203                 return;
1204         num_vlink_desc = 0;
1205
1206         while (rlen >= sizeof(*desc)) {
1207                 dlen = desc->fip_dlen * FIP_BPW;
1208                 if (dlen > rlen)
1209                         goto err;
1210                 /* Drop CVL if there are duplicate critical descriptors */
1211                 if ((desc->fip_dtype < 32) &&
1212                     (desc->fip_dtype != FIP_DT_VN_ID) &&
1213                     !(desc_mask & 1U << desc->fip_dtype)) {
1214                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1215                                         "Descriptors in FIP CVL\n");
1216                         goto err;
1217                 }
1218                 switch (desc->fip_dtype) {
1219                 case FIP_DT_MAC:
1220                         mp = (struct fip_mac_desc *)desc;
1221                         if (dlen < sizeof(*mp))
1222                                 goto err;
1223                         if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
1224                                 goto err;
1225                         desc_mask &= ~BIT(FIP_DT_MAC);
1226                         break;
1227                 case FIP_DT_NAME:
1228                         wp = (struct fip_wwn_desc *)desc;
1229                         if (dlen < sizeof(*wp))
1230                                 goto err;
1231                         if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
1232                                 goto err;
1233                         desc_mask &= ~BIT(FIP_DT_NAME);
1234                         break;
1235                 case FIP_DT_VN_ID:
1236                         vp = (struct fip_vn_desc *)desc;
1237                         if (dlen < sizeof(*vp))
1238                                 goto err;
1239                         vlink_desc_arr[num_vlink_desc++] = vp;
1240                         vn_port = fc_vport_id_lookup(lport,
1241                                                       ntoh24(vp->fd_fc_id));
1242                         if (vn_port && (vn_port == lport)) {
1243                                 mutex_lock(&fip->ctlr_mutex);
1244                                 per_cpu_ptr(lport->dev_stats,
1245                                             get_cpu())->VLinkFailureCount++;
1246                                 put_cpu();
1247                                 fcoe_ctlr_reset(fip);
1248                                 mutex_unlock(&fip->ctlr_mutex);
1249                         }
1250                         break;
1251                 default:
1252                         /* standard says ignore unknown descriptors >= 128 */
1253                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1254                                 goto err;
1255                         break;
1256                 }
1257                 desc = (struct fip_desc *)((char *)desc + dlen);
1258                 rlen -= dlen;
1259         }
1260
1261         /*
1262          * reset only if all required descriptors were present and valid.
1263          */
1264         if (desc_mask)
1265                 LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
1266                                 desc_mask);
1267         else if (!num_vlink_desc) {
1268                 LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
1269                 /*
1270                  * No Vx_Port description. Clear all NPIV ports,
1271                  * followed by physical port
1272                  */
1273                 mutex_lock(&lport->lp_mutex);
1274                 list_for_each_entry(vn_port, &lport->vports, list)
1275                         fc_lport_reset(vn_port);
1276                 mutex_unlock(&lport->lp_mutex);
1277
1278                 mutex_lock(&fip->ctlr_mutex);
1279                 per_cpu_ptr(lport->dev_stats,
1280                             get_cpu())->VLinkFailureCount++;
1281                 put_cpu();
1282                 fcoe_ctlr_reset(fip);
1283                 mutex_unlock(&fip->ctlr_mutex);
1284
1285                 fc_lport_reset(fip->lp);
1286                 fcoe_ctlr_solicit(fip, NULL);
1287         } else {
1288                 int i;
1289
1290                 LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
1291                 for (i = 0; i < num_vlink_desc; i++) {
1292                         vp = vlink_desc_arr[i];
1293                         vn_port = fc_vport_id_lookup(lport,
1294                                                      ntoh24(vp->fd_fc_id));
1295                         if (!vn_port)
1296                                 continue;
1297
1298                         /*
1299                          * 'port_id' is already validated, check MAC address and
1300                          * wwpn
1301                          */
1302                         if (compare_ether_addr(fip->get_src_addr(vn_port),
1303                                                 vp->fd_mac) != 0 ||
1304                                 get_unaligned_be64(&vp->fd_wwpn) !=
1305                                                         vn_port->wwpn)
1306                                 continue;
1307
1308                         if (vn_port == lport)
1309                                 /*
1310                                  * Physical port, defer processing till all
1311                                  * listed NPIV ports are cleared
1312                                  */
1313                                 reset_phys_port = 1;
1314                         else    /* NPIV port */
1315                                 fc_lport_reset(vn_port);
1316                 }
1317
1318                 if (reset_phys_port) {
1319                         fc_lport_reset(fip->lp);
1320                         fcoe_ctlr_solicit(fip, NULL);
1321                 }
1322         }
1323
1324 err:
1325         kfree(vlink_desc_arr);
1326 }
1327
1328 /**
1329  * fcoe_ctlr_recv() - Receive a FIP packet
1330  * @fip: The FCoE controller that received the packet
1331  * @skb: The received FIP packet
1332  *
1333  * This may be called from either NET_RX_SOFTIRQ or IRQ.
1334  */
1335 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1336 {
1337         skb_queue_tail(&fip->fip_recv_list, skb);
1338         schedule_work(&fip->recv_work);
1339 }
1340 EXPORT_SYMBOL(fcoe_ctlr_recv);
1341
1342 /**
1343  * fcoe_ctlr_recv_handler() - Receive a FIP frame
1344  * @fip: The FCoE controller that received the frame
1345  * @skb: The received FIP frame
1346  *
1347  * Returns non-zero if the frame is dropped.
1348  */
1349 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
1350 {
1351         struct fip_header *fiph;
1352         struct ethhdr *eh;
1353         enum fip_state state;
1354         u16 op;
1355         u8 sub;
1356
1357         if (skb_linearize(skb))
1358                 goto drop;
1359         if (skb->len < sizeof(*fiph))
1360                 goto drop;
1361         eh = eth_hdr(skb);
1362         if (fip->mode == FIP_MODE_VN2VN) {
1363                 if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1364                     compare_ether_addr(eh->h_dest, fcoe_all_vn2vn) &&
1365                     compare_ether_addr(eh->h_dest, fcoe_all_p2p))
1366                         goto drop;
1367         } else if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1368                    compare_ether_addr(eh->h_dest, fcoe_all_enode))
1369                 goto drop;
1370         fiph = (struct fip_header *)skb->data;
1371         op = ntohs(fiph->fip_op);
1372         sub = fiph->fip_subcode;
1373
1374         if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
1375                 goto drop;
1376         if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
1377                 goto drop;
1378
1379         mutex_lock(&fip->ctlr_mutex);
1380         state = fip->state;
1381         if (state == FIP_ST_AUTO) {
1382                 fip->map_dest = 0;
1383                 fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
1384                 state = FIP_ST_ENABLED;
1385                 LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
1386         }
1387         mutex_unlock(&fip->ctlr_mutex);
1388
1389         if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
1390                 return fcoe_ctlr_vn_recv(fip, skb);
1391
1392         if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
1393             state != FIP_ST_VNMP_CLAIM)
1394                 goto drop;
1395
1396         if (op == FIP_OP_LS) {
1397                 fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
1398                 return 0;
1399         }
1400
1401         if (state != FIP_ST_ENABLED)
1402                 goto drop;
1403
1404         if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
1405                 fcoe_ctlr_recv_adv(fip, skb);
1406         else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
1407                 fcoe_ctlr_recv_clr_vlink(fip, fiph);
1408         kfree_skb(skb);
1409         return 0;
1410 drop:
1411         kfree_skb(skb);
1412         return -1;
1413 }
1414
1415 /**
1416  * fcoe_ctlr_select() - Select the best FCF (if possible)
1417  * @fip: The FCoE controller
1418  *
1419  * Returns the selected FCF, or NULL if none are usable.
1420  *
1421  * If there are conflicting advertisements, no FCF can be chosen.
1422  *
1423  * If there is already a selected FCF, this will choose a better one or
1424  * an equivalent one that hasn't already been sent a FLOGI.
1425  *
1426  * Called with lock held.
1427  */
1428 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
1429 {
1430         struct fcoe_fcf *fcf;
1431         struct fcoe_fcf *best = fip->sel_fcf;
1432         struct fcoe_fcf *first;
1433
1434         first = list_first_entry(&fip->fcfs, struct fcoe_fcf, list);
1435
1436         list_for_each_entry(fcf, &fip->fcfs, list) {
1437                 LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
1438                                 "VFID %d mac %pM map %x val %d "
1439                                 "sent %u pri %u\n",
1440                                 fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
1441                                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
1442                                 fcf->flogi_sent, fcf->pri);
1443                 if (fcf->fabric_name != first->fabric_name ||
1444                     fcf->vfid != first->vfid ||
1445                     fcf->fc_map != first->fc_map) {
1446                         LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
1447                                         "or FC-MAP\n");
1448                         return NULL;
1449                 }
1450                 if (fcf->flogi_sent)
1451                         continue;
1452                 if (!fcoe_ctlr_fcf_usable(fcf)) {
1453                         LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
1454                                         "map %x %svalid %savailable\n",
1455                                         fcf->fabric_name, fcf->fc_map,
1456                                         (fcf->flags & FIP_FL_SOL) ? "" : "in",
1457                                         (fcf->flags & FIP_FL_AVAIL) ?
1458                                         "" : "un");
1459                         continue;
1460                 }
1461                 if (!best || fcf->pri < best->pri || best->flogi_sent)
1462                         best = fcf;
1463         }
1464         fip->sel_fcf = best;
1465         if (best) {
1466                 LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
1467                 fip->port_ka_time = jiffies +
1468                         msecs_to_jiffies(FIP_VN_KA_PERIOD);
1469                 fip->ctlr_ka_time = jiffies + best->fka_period;
1470                 if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1471                         mod_timer(&fip->timer, fip->ctlr_ka_time);
1472         }
1473         return best;
1474 }
1475
1476 /**
1477  * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
1478  * @fip: The FCoE controller
1479  *
1480  * Returns non-zero error if it could not be sent.
1481  *
1482  * Called with ctlr_mutex and ctlr_lock held.
1483  * Caller must verify that fip->sel_fcf is not NULL.
1484  */
1485 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
1486 {
1487         struct sk_buff *skb;
1488         struct sk_buff *skb_orig;
1489         struct fc_frame_header *fh;
1490         int error;
1491
1492         skb_orig = fip->flogi_req;
1493         if (!skb_orig)
1494                 return -EINVAL;
1495
1496         /*
1497          * Clone and send the FLOGI request.  If clone fails, use original.
1498          */
1499         skb = skb_clone(skb_orig, GFP_ATOMIC);
1500         if (!skb) {
1501                 skb = skb_orig;
1502                 fip->flogi_req = NULL;
1503         }
1504         fh = (struct fc_frame_header *)skb->data;
1505         error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
1506                                  ntoh24(fh->fh_d_id));
1507         if (error) {
1508                 kfree_skb(skb);
1509                 return error;
1510         }
1511         fip->send(fip, skb);
1512         fip->sel_fcf->flogi_sent = 1;
1513         return 0;
1514 }
1515
1516 /**
1517  * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
1518  * @fip: The FCoE controller
1519  *
1520  * Returns non-zero error code if there's no FLOGI request to retry or
1521  * no alternate FCF available.
1522  */
1523 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
1524 {
1525         struct fcoe_fcf *fcf;
1526         int error;
1527
1528         mutex_lock(&fip->ctlr_mutex);
1529         spin_lock_bh(&fip->ctlr_lock);
1530         LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
1531         fcf = fcoe_ctlr_select(fip);
1532         if (!fcf || fcf->flogi_sent) {
1533                 kfree_skb(fip->flogi_req);
1534                 fip->flogi_req = NULL;
1535                 error = -ENOENT;
1536         } else {
1537                 fcoe_ctlr_solicit(fip, NULL);
1538                 error = fcoe_ctlr_flogi_send_locked(fip);
1539         }
1540         spin_unlock_bh(&fip->ctlr_lock);
1541         mutex_unlock(&fip->ctlr_mutex);
1542         return error;
1543 }
1544
1545
1546 /**
1547  * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
1548  * @fip: The FCoE controller that timed out
1549  *
1550  * Done here because fcoe_ctlr_els_send() can't get mutex.
1551  *
1552  * Called with ctlr_mutex held.  The caller must not hold ctlr_lock.
1553  */
1554 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
1555 {
1556         struct fcoe_fcf *fcf;
1557
1558         spin_lock_bh(&fip->ctlr_lock);
1559         fcf = fip->sel_fcf;
1560         if (!fcf || !fip->flogi_req_send)
1561                 goto unlock;
1562
1563         LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
1564
1565         /*
1566          * If this FLOGI is being sent due to a timeout retry
1567          * to the same FCF as before, select a different FCF if possible.
1568          */
1569         if (fcf->flogi_sent) {
1570                 LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
1571                 fcf = fcoe_ctlr_select(fip);
1572                 if (!fcf || fcf->flogi_sent) {
1573                         LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
1574                         list_for_each_entry(fcf, &fip->fcfs, list)
1575                                 fcf->flogi_sent = 0;
1576                         fcf = fcoe_ctlr_select(fip);
1577                 }
1578         }
1579         if (fcf) {
1580                 fcoe_ctlr_flogi_send_locked(fip);
1581                 fip->flogi_req_send = 0;
1582         } else /* XXX */
1583                 LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
1584 unlock:
1585         spin_unlock_bh(&fip->ctlr_lock);
1586 }
1587
1588 /**
1589  * fcoe_ctlr_timeout() - FIP timeout handler
1590  * @arg: The FCoE controller that timed out
1591  */
1592 static void fcoe_ctlr_timeout(unsigned long arg)
1593 {
1594         struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
1595
1596         schedule_work(&fip->timer_work);
1597 }
1598
1599 /**
1600  * fcoe_ctlr_timer_work() - Worker thread function for timer work
1601  * @work: Handle to a FCoE controller
1602  *
1603  * Ages FCFs.  Triggers FCF selection if possible.
1604  * Sends keep-alives and resets.
1605  */
1606 static void fcoe_ctlr_timer_work(struct work_struct *work)
1607 {
1608         struct fcoe_ctlr *fip;
1609         struct fc_lport *vport;
1610         u8 *mac;
1611         u8 reset = 0;
1612         u8 send_ctlr_ka = 0;
1613         u8 send_port_ka = 0;
1614         struct fcoe_fcf *sel;
1615         struct fcoe_fcf *fcf;
1616         unsigned long next_timer;
1617
1618         fip = container_of(work, struct fcoe_ctlr, timer_work);
1619         if (fip->mode == FIP_MODE_VN2VN)
1620                 return fcoe_ctlr_vn_timeout(fip);
1621         mutex_lock(&fip->ctlr_mutex);
1622         if (fip->state == FIP_ST_DISABLED) {
1623                 mutex_unlock(&fip->ctlr_mutex);
1624                 return;
1625         }
1626
1627         fcf = fip->sel_fcf;
1628         next_timer = fcoe_ctlr_age_fcfs(fip);
1629
1630         sel = fip->sel_fcf;
1631         if (!sel && fip->sel_time) {
1632                 if (time_after_eq(jiffies, fip->sel_time)) {
1633                         sel = fcoe_ctlr_select(fip);
1634                         fip->sel_time = 0;
1635                 } else if (time_after(next_timer, fip->sel_time))
1636                         next_timer = fip->sel_time;
1637         }
1638
1639         if (sel && fip->flogi_req_send)
1640                 fcoe_ctlr_flogi_send(fip);
1641         else if (!sel && fcf)
1642                 reset = 1;
1643
1644         if (sel && !sel->fd_flags) {
1645                 if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
1646                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1647                         send_ctlr_ka = 1;
1648                 }
1649                 if (time_after(next_timer, fip->ctlr_ka_time))
1650                         next_timer = fip->ctlr_ka_time;
1651
1652                 if (time_after_eq(jiffies, fip->port_ka_time)) {
1653                         fip->port_ka_time = jiffies +
1654                                 msecs_to_jiffies(FIP_VN_KA_PERIOD);
1655                         send_port_ka = 1;
1656                 }
1657                 if (time_after(next_timer, fip->port_ka_time))
1658                         next_timer = fip->port_ka_time;
1659         }
1660         if (!list_empty(&fip->fcfs))
1661                 mod_timer(&fip->timer, next_timer);
1662         mutex_unlock(&fip->ctlr_mutex);
1663
1664         if (reset) {
1665                 fc_lport_reset(fip->lp);
1666                 /* restart things with a solicitation */
1667                 fcoe_ctlr_solicit(fip, NULL);
1668         }
1669
1670         if (send_ctlr_ka)
1671                 fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
1672
1673         if (send_port_ka) {
1674                 mutex_lock(&fip->lp->lp_mutex);
1675                 mac = fip->get_src_addr(fip->lp);
1676                 fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
1677                 list_for_each_entry(vport, &fip->lp->vports, list) {
1678                         mac = fip->get_src_addr(vport);
1679                         fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
1680                 }
1681                 mutex_unlock(&fip->lp->lp_mutex);
1682         }
1683 }
1684
1685 /**
1686  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
1687  * @recv_work: Handle to a FCoE controller
1688  */
1689 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
1690 {
1691         struct fcoe_ctlr *fip;
1692         struct sk_buff *skb;
1693
1694         fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1695         while ((skb = skb_dequeue(&fip->fip_recv_list)))
1696                 fcoe_ctlr_recv_handler(fip, skb);
1697 }
1698
1699 /**
1700  * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
1701  * @fip: The FCoE controller
1702  * @fp:  The FC frame to snoop
1703  *
1704  * Snoop potential response to FLOGI or even incoming FLOGI.
1705  *
1706  * The caller has checked that we are waiting for login as indicated
1707  * by fip->flogi_oxid != FC_XID_UNKNOWN.
1708  *
1709  * The caller is responsible for freeing the frame.
1710  * Fill in the granted_mac address.
1711  *
1712  * Return non-zero if the frame should not be delivered to libfc.
1713  */
1714 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
1715                          struct fc_frame *fp)
1716 {
1717         struct fc_frame_header *fh;
1718         u8 op;
1719         u8 *sa;
1720
1721         sa = eth_hdr(&fp->skb)->h_source;
1722         fh = fc_frame_header_get(fp);
1723         if (fh->fh_type != FC_TYPE_ELS)
1724                 return 0;
1725
1726         op = fc_frame_payload_op(fp);
1727         if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
1728             fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1729
1730                 mutex_lock(&fip->ctlr_mutex);
1731                 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
1732                         mutex_unlock(&fip->ctlr_mutex);
1733                         return -EINVAL;
1734                 }
1735                 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1736                 LIBFCOE_FIP_DBG(fip,
1737                                 "received FLOGI LS_ACC using non-FIP mode\n");
1738
1739                 /*
1740                  * FLOGI accepted.
1741                  * If the src mac addr is FC_OUI-based, then we mark the
1742                  * address_mode flag to use FC_OUI-based Ethernet DA.
1743                  * Otherwise we use the FCoE gateway addr
1744                  */
1745                 if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
1746                         fcoe_ctlr_map_dest(fip);
1747                 } else {
1748                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1749                         fip->map_dest = 0;
1750                 }
1751                 fip->flogi_oxid = FC_XID_UNKNOWN;
1752                 mutex_unlock(&fip->ctlr_mutex);
1753                 fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
1754         } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
1755                 /*
1756                  * Save source MAC for point-to-point responses.
1757                  */
1758                 mutex_lock(&fip->ctlr_mutex);
1759                 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
1760                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1761                         fip->map_dest = 0;
1762                         if (fip->state == FIP_ST_AUTO)
1763                                 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
1764                                                 "Setting non-FIP mode\n");
1765                         fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1766                 }
1767                 mutex_unlock(&fip->ctlr_mutex);
1768         }
1769         return 0;
1770 }
1771 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
1772
1773 /**
1774  * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
1775  * @mac:    The MAC address to convert
1776  * @scheme: The scheme to use when converting
1777  * @port:   The port indicator for converting
1778  *
1779  * Returns: u64 fc world wide name
1780  */
1781 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1782                       unsigned int scheme, unsigned int port)
1783 {
1784         u64 wwn;
1785         u64 host_mac;
1786
1787         /* The MAC is in NO, so flip only the low 48 bits */
1788         host_mac = ((u64) mac[0] << 40) |
1789                 ((u64) mac[1] << 32) |
1790                 ((u64) mac[2] << 24) |
1791                 ((u64) mac[3] << 16) |
1792                 ((u64) mac[4] << 8) |
1793                 (u64) mac[5];
1794
1795         WARN_ON(host_mac >= (1ULL << 48));
1796         wwn = host_mac | ((u64) scheme << 60);
1797         switch (scheme) {
1798         case 1:
1799                 WARN_ON(port != 0);
1800                 break;
1801         case 2:
1802                 WARN_ON(port >= 0xfff);
1803                 wwn |= (u64) port << 48;
1804                 break;
1805         default:
1806                 WARN_ON(1);
1807                 break;
1808         }
1809
1810         return wwn;
1811 }
1812 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1813
1814 /**
1815  * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
1816  * @rdata: libfc remote port
1817  */
1818 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
1819 {
1820         return (struct fcoe_rport *)(rdata + 1);
1821 }
1822
1823 /**
1824  * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
1825  * @fip: The FCoE controller
1826  * @sub: sub-opcode for probe request, reply, or advertisement.
1827  * @dest: The destination Ethernet MAC address
1828  * @min_len: minimum size of the Ethernet payload to be sent
1829  */
1830 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
1831                               enum fip_vn2vn_subcode sub,
1832                               const u8 *dest, size_t min_len)
1833 {
1834         struct sk_buff *skb;
1835         struct fip_frame {
1836                 struct ethhdr eth;
1837                 struct fip_header fip;
1838                 struct fip_mac_desc mac;
1839                 struct fip_wwn_desc wwnn;
1840                 struct fip_vn_desc vn;
1841         } __packed * frame;
1842         struct fip_fc4_feat *ff;
1843         struct fip_size_desc *size;
1844         u32 fcp_feat;
1845         size_t len;
1846         size_t dlen;
1847
1848         len = sizeof(*frame);
1849         dlen = 0;
1850         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
1851                 dlen = sizeof(struct fip_fc4_feat) +
1852                        sizeof(struct fip_size_desc);
1853                 len += dlen;
1854         }
1855         dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
1856         len = max(len, min_len + sizeof(struct ethhdr));
1857
1858         skb = dev_alloc_skb(len);
1859         if (!skb)
1860                 return;
1861
1862         frame = (struct fip_frame *)skb->data;
1863         memset(frame, 0, len);
1864         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
1865         memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
1866         frame->eth.h_proto = htons(ETH_P_FIP);
1867
1868         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
1869         frame->fip.fip_op = htons(FIP_OP_VN2VN);
1870         frame->fip.fip_subcode = sub;
1871         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
1872
1873         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
1874         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
1875         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
1876
1877         frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
1878         frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
1879         put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
1880
1881         frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
1882         frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
1883         hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
1884         hton24(frame->vn.fd_mac + 3, fip->port_id);
1885         hton24(frame->vn.fd_fc_id, fip->port_id);
1886         put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
1887
1888         /*
1889          * For claims, add FC-4 features.
1890          * TBD: Add interface to get fc-4 types and features from libfc.
1891          */
1892         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
1893                 ff = (struct fip_fc4_feat *)(frame + 1);
1894                 ff->fd_desc.fip_dtype = FIP_DT_FC4F;
1895                 ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
1896                 ff->fd_fts = fip->lp->fcts;
1897
1898                 fcp_feat = 0;
1899                 if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
1900                         fcp_feat |= FCP_FEAT_INIT;
1901                 if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
1902                         fcp_feat |= FCP_FEAT_TARG;
1903                 fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
1904                 ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
1905
1906                 size = (struct fip_size_desc *)(ff + 1);
1907                 size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
1908                 size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
1909                 size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
1910         }
1911
1912         skb_put(skb, len);
1913         skb->protocol = htons(ETH_P_FIP);
1914         skb_reset_mac_header(skb);
1915         skb_reset_network_header(skb);
1916
1917         fip->send(fip, skb);
1918 }
1919
1920 /**
1921  * fcoe_ctlr_vn_rport_callback - Event handler for rport events.
1922  * @lport: The lport which is receiving the event
1923  * @rdata: remote port private data
1924  * @event: The event that occurred
1925  *
1926  * Locking Note:  The rport lock must not be held when calling this function.
1927  */
1928 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
1929                                         struct fc_rport_priv *rdata,
1930                                         enum fc_rport_event event)
1931 {
1932         struct fcoe_ctlr *fip = lport->disc.priv;
1933         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
1934
1935         LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
1936                         rdata->ids.port_id, event);
1937
1938         mutex_lock(&fip->ctlr_mutex);
1939         switch (event) {
1940         case RPORT_EV_READY:
1941                 frport->login_count = 0;
1942                 break;
1943         case RPORT_EV_LOGO:
1944         case RPORT_EV_FAILED:
1945         case RPORT_EV_STOP:
1946                 frport->login_count++;
1947                 if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
1948                         LIBFCOE_FIP_DBG(fip,
1949                                         "rport FLOGI limited port_id %6.6x\n",
1950                                         rdata->ids.port_id);
1951                         lport->tt.rport_logoff(rdata);
1952                 }
1953                 break;
1954         default:
1955                 break;
1956         }
1957         mutex_unlock(&fip->ctlr_mutex);
1958 }
1959
1960 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
1961         .event_callback = fcoe_ctlr_vn_rport_callback,
1962 };
1963
1964 /**
1965  * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
1966  * @fip: The FCoE controller
1967  *
1968  * Called with ctlr_mutex held.
1969  */
1970 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
1971 {
1972         mutex_lock(&lport->disc.disc_mutex);
1973         lport->disc.disc_callback = NULL;
1974         mutex_unlock(&lport->disc.disc_mutex);
1975 }
1976
1977 /**
1978  * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
1979  * @fip: The FCoE controller
1980  *
1981  * Called through the local port template for discovery.
1982  * Called without the ctlr_mutex held.
1983  */
1984 static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
1985 {
1986         struct fcoe_ctlr *fip = lport->disc.priv;
1987
1988         mutex_lock(&fip->ctlr_mutex);
1989         fcoe_ctlr_disc_stop_locked(lport);
1990         mutex_unlock(&fip->ctlr_mutex);
1991 }
1992
1993 /**
1994  * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
1995  * @fip: The FCoE controller
1996  *
1997  * Called through the local port template for discovery.
1998  * Called without the ctlr_mutex held.
1999  */
2000 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
2001 {
2002         fcoe_ctlr_disc_stop(lport);
2003         lport->tt.rport_flush_queue();
2004         synchronize_rcu();
2005 }
2006
2007 /**
2008  * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
2009  * @fip: The FCoE controller
2010  *
2011  * Called with fcoe_ctlr lock held.
2012  */
2013 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
2014 {
2015         unsigned long wait;
2016         u32 port_id;
2017
2018         fcoe_ctlr_disc_stop_locked(fip->lp);
2019
2020         /*
2021          * Get proposed port ID.
2022          * If this is the first try after link up, use any previous port_id.
2023          * If there was none, use the low bits of the port_name.
2024          * On subsequent tries, get the next random one.
2025          * Don't use reserved IDs, use another non-zero value, just as random.
2026          */
2027         port_id = fip->port_id;
2028         if (fip->probe_tries)
2029                 port_id = prandom32(&fip->rnd_state) & 0xffff;
2030         else if (!port_id)
2031                 port_id = fip->lp->wwpn & 0xffff;
2032         if (!port_id || port_id == 0xffff)
2033                 port_id = 1;
2034         fip->port_id = port_id;
2035
2036         if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
2037                 fip->probe_tries++;
2038                 wait = random32() % FIP_VN_PROBE_WAIT;
2039         } else
2040                 wait = FIP_VN_RLIM_INT;
2041         mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
2042         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
2043 }
2044
2045 /**
2046  * fcoe_ctlr_vn_start() - Start in VN2VN mode
2047  * @fip: The FCoE controller
2048  *
2049  * Called with fcoe_ctlr lock held.
2050  */
2051 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
2052 {
2053         fip->probe_tries = 0;
2054         prandom32_seed(&fip->rnd_state, fip->lp->wwpn);
2055         fcoe_ctlr_vn_restart(fip);
2056 }
2057
2058 /**
2059  * fcoe_ctlr_vn_parse - parse probe request or response
2060  * @fip: The FCoE controller
2061  * @skb: incoming packet
2062  * @rdata: buffer for resulting parsed VN entry plus fcoe_rport
2063  *
2064  * Returns non-zero error number on error.
2065  * Does not consume the packet.
2066  */
2067 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
2068                               struct sk_buff *skb,
2069                               struct fc_rport_priv *rdata)
2070 {
2071         struct fip_header *fiph;
2072         struct fip_desc *desc = NULL;
2073         struct fip_mac_desc *macd = NULL;
2074         struct fip_wwn_desc *wwn = NULL;
2075         struct fip_vn_desc *vn = NULL;
2076         struct fip_size_desc *size = NULL;
2077         struct fcoe_rport *frport;
2078         size_t rlen;
2079         size_t dlen;
2080         u32 desc_mask = 0;
2081         u32 dtype;
2082         u8 sub;
2083
2084         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2085         frport = fcoe_ctlr_rport(rdata);
2086
2087         fiph = (struct fip_header *)skb->data;
2088         frport->flags = ntohs(fiph->fip_flags);
2089
2090         sub = fiph->fip_subcode;
2091         switch (sub) {
2092         case FIP_SC_VN_PROBE_REQ:
2093         case FIP_SC_VN_PROBE_REP:
2094         case FIP_SC_VN_BEACON:
2095                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2096                             BIT(FIP_DT_VN_ID);
2097                 break;
2098         case FIP_SC_VN_CLAIM_NOTIFY:
2099         case FIP_SC_VN_CLAIM_REP:
2100                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2101                             BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
2102                             BIT(FIP_DT_FCOE_SIZE);
2103                 break;
2104         default:
2105                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2106                 return -EINVAL;
2107         }
2108
2109         rlen = ntohs(fiph->fip_dl_len) * 4;
2110         if (rlen + sizeof(*fiph) > skb->len)
2111                 return -EINVAL;
2112
2113         desc = (struct fip_desc *)(fiph + 1);
2114         while (rlen > 0) {
2115                 dlen = desc->fip_dlen * FIP_BPW;
2116                 if (dlen < sizeof(*desc) || dlen > rlen)
2117                         return -EINVAL;
2118
2119                 dtype = desc->fip_dtype;
2120                 if (dtype < 32) {
2121                         if (!(desc_mask & BIT(dtype))) {
2122                                 LIBFCOE_FIP_DBG(fip,
2123                                                 "unexpected or duplicated desc "
2124                                                 "desc type %u in "
2125                                                 "FIP VN2VN subtype %u\n",
2126                                                 dtype, sub);
2127                                 return -EINVAL;
2128                         }
2129                         desc_mask &= ~BIT(dtype);
2130                 }
2131
2132                 switch (dtype) {
2133                 case FIP_DT_MAC:
2134                         if (dlen != sizeof(struct fip_mac_desc))
2135                                 goto len_err;
2136                         macd = (struct fip_mac_desc *)desc;
2137                         if (!is_valid_ether_addr(macd->fd_mac)) {
2138                                 LIBFCOE_FIP_DBG(fip,
2139                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2140                                          macd->fd_mac);
2141                                 return -EINVAL;
2142                         }
2143                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2144                         break;
2145                 case FIP_DT_NAME:
2146                         if (dlen != sizeof(struct fip_wwn_desc))
2147                                 goto len_err;
2148                         wwn = (struct fip_wwn_desc *)desc;
2149                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2150                         break;
2151                 case FIP_DT_VN_ID:
2152                         if (dlen != sizeof(struct fip_vn_desc))
2153                                 goto len_err;
2154                         vn = (struct fip_vn_desc *)desc;
2155                         memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
2156                         rdata->ids.port_id = ntoh24(vn->fd_fc_id);
2157                         rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn);
2158                         break;
2159                 case FIP_DT_FC4F:
2160                         if (dlen != sizeof(struct fip_fc4_feat))
2161                                 goto len_err;
2162                         break;
2163                 case FIP_DT_FCOE_SIZE:
2164                         if (dlen != sizeof(struct fip_size_desc))
2165                                 goto len_err;
2166                         size = (struct fip_size_desc *)desc;
2167                         frport->fcoe_len = ntohs(size->fd_size);
2168                         break;
2169                 default:
2170                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2171                                         "in FIP probe\n", dtype);
2172                         /* standard says ignore unknown descriptors >= 128 */
2173                         if (dtype < FIP_DT_VENDOR_BASE)
2174                                 return -EINVAL;
2175                         break;
2176                 }
2177                 desc = (struct fip_desc *)((char *)desc + dlen);
2178                 rlen -= dlen;
2179         }
2180         return 0;
2181
2182 len_err:
2183         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2184                         dtype, dlen);
2185         return -EINVAL;
2186 }
2187
2188 /**
2189  * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
2190  * @fip: The FCoE controller
2191  *
2192  * Called with ctlr_mutex held.
2193  */
2194 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
2195 {
2196         fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
2197         fip->sol_time = jiffies;
2198 }
2199
2200 /**
2201  * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
2202  * @fip: The FCoE controller
2203  * @rdata: parsed remote port with frport from the probe request
2204  *
2205  * Called with ctlr_mutex held.
2206  */
2207 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
2208                                    struct fc_rport_priv *rdata)
2209 {
2210         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2211
2212         if (rdata->ids.port_id != fip->port_id)
2213                 return;
2214
2215         switch (fip->state) {
2216         case FIP_ST_VNMP_CLAIM:
2217         case FIP_ST_VNMP_UP:
2218                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2219                                   frport->enode_mac, 0);
2220                 break;
2221         case FIP_ST_VNMP_PROBE1:
2222         case FIP_ST_VNMP_PROBE2:
2223                 /*
2224                  * Decide whether to reply to the Probe.
2225                  * Our selected address is never a "recorded" one, so
2226                  * only reply if our WWPN is greater and the
2227                  * Probe's REC bit is not set.
2228                  * If we don't reply, we will change our address.
2229                  */
2230                 if (fip->lp->wwpn > rdata->ids.port_name &&
2231                     !(frport->flags & FIP_FL_REC_OR_P2P)) {
2232                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2233                                           frport->enode_mac, 0);
2234                         break;
2235                 }
2236                 /* fall through */
2237         case FIP_ST_VNMP_START:
2238                 fcoe_ctlr_vn_restart(fip);
2239                 break;
2240         default:
2241                 break;
2242         }
2243 }
2244
2245 /**
2246  * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
2247  * @fip: The FCoE controller
2248  * @rdata: parsed remote port with frport from the probe request
2249  *
2250  * Called with ctlr_mutex held.
2251  */
2252 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
2253                                    struct fc_rport_priv *rdata)
2254 {
2255         if (rdata->ids.port_id != fip->port_id)
2256                 return;
2257         switch (fip->state) {
2258         case FIP_ST_VNMP_START:
2259         case FIP_ST_VNMP_PROBE1:
2260         case FIP_ST_VNMP_PROBE2:
2261         case FIP_ST_VNMP_CLAIM:
2262                 fcoe_ctlr_vn_restart(fip);
2263                 break;
2264         case FIP_ST_VNMP_UP:
2265                 fcoe_ctlr_vn_send_claim(fip);
2266                 break;
2267         default:
2268                 break;
2269         }
2270 }
2271
2272 /**
2273  * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
2274  * @fip: The FCoE controller
2275  * @new: newly-parsed remote port with frport as a template for new rdata
2276  *
2277  * Called with ctlr_mutex held.
2278  */
2279 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new)
2280 {
2281         struct fc_lport *lport = fip->lp;
2282         struct fc_rport_priv *rdata;
2283         struct fc_rport_identifiers *ids;
2284         struct fcoe_rport *frport;
2285         u32 port_id;
2286
2287         port_id = new->ids.port_id;
2288         if (port_id == fip->port_id)
2289                 return;
2290
2291         mutex_lock(&lport->disc.disc_mutex);
2292         rdata = lport->tt.rport_create(lport, port_id);
2293         if (!rdata) {
2294                 mutex_unlock(&lport->disc.disc_mutex);
2295                 return;
2296         }
2297
2298         rdata->ops = &fcoe_ctlr_vn_rport_ops;
2299         rdata->disc_id = lport->disc.disc_id;
2300
2301         ids = &rdata->ids;
2302         if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) ||
2303             (ids->node_name != -1 && ids->node_name != new->ids.node_name))
2304                 lport->tt.rport_logoff(rdata);
2305         ids->port_name = new->ids.port_name;
2306         ids->node_name = new->ids.node_name;
2307         mutex_unlock(&lport->disc.disc_mutex);
2308
2309         frport = fcoe_ctlr_rport(rdata);
2310         LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s\n",
2311                         port_id, frport->fcoe_len ? "old" : "new");
2312         *frport = *fcoe_ctlr_rport(new);
2313         frport->time = 0;
2314 }
2315
2316 /**
2317  * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
2318  * @fip: The FCoE controller
2319  * @port_id:  The port_id of the remote VN_node
2320  * @mac: buffer which will hold the VN_NODE destination MAC address, if found.
2321  *
2322  * Returns non-zero error if no remote port found.
2323  */
2324 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
2325 {
2326         struct fc_lport *lport = fip->lp;
2327         struct fc_rport_priv *rdata;
2328         struct fcoe_rport *frport;
2329         int ret = -1;
2330
2331         rcu_read_lock();
2332         rdata = lport->tt.rport_lookup(lport, port_id);
2333         if (rdata) {
2334                 frport = fcoe_ctlr_rport(rdata);
2335                 memcpy(mac, frport->enode_mac, ETH_ALEN);
2336                 ret = 0;
2337         }
2338         rcu_read_unlock();
2339         return ret;
2340 }
2341
2342 /**
2343  * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
2344  * @fip: The FCoE controller
2345  * @new: newly-parsed remote port with frport as a template for new rdata
2346  *
2347  * Called with ctlr_mutex held.
2348  */
2349 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
2350                                       struct fc_rport_priv *new)
2351 {
2352         struct fcoe_rport *frport = fcoe_ctlr_rport(new);
2353
2354         if (frport->flags & FIP_FL_REC_OR_P2P) {
2355                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2356                 return;
2357         }
2358         switch (fip->state) {
2359         case FIP_ST_VNMP_START:
2360         case FIP_ST_VNMP_PROBE1:
2361         case FIP_ST_VNMP_PROBE2:
2362                 if (new->ids.port_id == fip->port_id)
2363                         fcoe_ctlr_vn_restart(fip);
2364                 break;
2365         case FIP_ST_VNMP_CLAIM:
2366         case FIP_ST_VNMP_UP:
2367                 if (new->ids.port_id == fip->port_id) {
2368                         if (new->ids.port_name > fip->lp->wwpn) {
2369                                 fcoe_ctlr_vn_restart(fip);
2370                                 break;
2371                         }
2372                         fcoe_ctlr_vn_send_claim(fip);
2373                         break;
2374                 }
2375                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac,
2376                                   min((u32)frport->fcoe_len,
2377                                       fcoe_ctlr_fcoe_size(fip)));
2378                 fcoe_ctlr_vn_add(fip, new);
2379                 break;
2380         default:
2381                 break;
2382         }
2383 }
2384
2385 /**
2386  * fcoe_ctlr_vn_claim_resp() - handle received Claim Response
2387  * @fip: The FCoE controller that received the frame
2388  * @new: newly-parsed remote port with frport from the Claim Response
2389  *
2390  * Called with ctlr_mutex held.
2391  */
2392 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
2393                                     struct fc_rport_priv *new)
2394 {
2395         LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
2396                         new->ids.port_id, fcoe_ctlr_state(fip->state));
2397         if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
2398                 fcoe_ctlr_vn_add(fip, new);
2399 }
2400
2401 /**
2402  * fcoe_ctlr_vn_beacon() - handle received beacon.
2403  * @fip: The FCoE controller that received the frame
2404  * @new: newly-parsed remote port with frport from the Beacon
2405  *
2406  * Called with ctlr_mutex held.
2407  */
2408 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
2409                                 struct fc_rport_priv *new)
2410 {
2411         struct fc_lport *lport = fip->lp;
2412         struct fc_rport_priv *rdata;
2413         struct fcoe_rport *frport;
2414
2415         frport = fcoe_ctlr_rport(new);
2416         if (frport->flags & FIP_FL_REC_OR_P2P) {
2417                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2418                 return;
2419         }
2420         mutex_lock(&lport->disc.disc_mutex);
2421         rdata = lport->tt.rport_lookup(lport, new->ids.port_id);
2422         if (rdata)
2423                 kref_get(&rdata->kref);
2424         mutex_unlock(&lport->disc.disc_mutex);
2425         if (rdata) {
2426                 if (rdata->ids.node_name == new->ids.node_name &&
2427                     rdata->ids.port_name == new->ids.port_name) {
2428                         frport = fcoe_ctlr_rport(rdata);
2429                         if (!frport->time && fip->state == FIP_ST_VNMP_UP)
2430                                 lport->tt.rport_login(rdata);
2431                         frport->time = jiffies;
2432                 }
2433                 kref_put(&rdata->kref, lport->tt.rport_destroy);
2434                 return;
2435         }
2436         if (fip->state != FIP_ST_VNMP_UP)
2437                 return;
2438
2439         /*
2440          * Beacon from a new neighbor.
2441          * Send a claim notify if one hasn't been sent recently.
2442          * Don't add the neighbor yet.
2443          */
2444         LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
2445                         new->ids.port_id);
2446         if (time_after(jiffies,
2447                        fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
2448                 fcoe_ctlr_vn_send_claim(fip);
2449 }
2450
2451 /**
2452  * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
2453  * @fip: The FCoE controller
2454  *
2455  * Called with ctlr_mutex held.
2456  * Called only in state FIP_ST_VNMP_UP.
2457  * Returns the soonest time for next age-out or a time far in the future.
2458  */
2459 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
2460 {
2461         struct fc_lport *lport = fip->lp;
2462         struct fc_rport_priv *rdata;
2463         struct fcoe_rport *frport;
2464         unsigned long next_time;
2465         unsigned long deadline;
2466
2467         next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
2468         mutex_lock(&lport->disc.disc_mutex);
2469         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
2470                 frport = fcoe_ctlr_rport(rdata);
2471                 if (!frport->time)
2472                         continue;
2473                 deadline = frport->time +
2474                            msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
2475                 if (time_after_eq(jiffies, deadline)) {
2476                         frport->time = 0;
2477                         LIBFCOE_FIP_DBG(fip,
2478                                 "port %16.16llx fc_id %6.6x beacon expired\n",
2479                                 rdata->ids.port_name, rdata->ids.port_id);
2480                         lport->tt.rport_logoff(rdata);
2481                 } else if (time_before(deadline, next_time))
2482                         next_time = deadline;
2483         }
2484         mutex_unlock(&lport->disc.disc_mutex);
2485         return next_time;
2486 }
2487
2488 /**
2489  * fcoe_ctlr_vn_recv() - Receive a FIP frame
2490  * @fip: The FCoE controller that received the frame
2491  * @skb: The received FIP frame
2492  *
2493  * Returns non-zero if the frame is dropped.
2494  * Always consumes the frame.
2495  */
2496 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2497 {
2498         struct fip_header *fiph;
2499         enum fip_vn2vn_subcode sub;
2500         struct {
2501                 struct fc_rport_priv rdata;
2502                 struct fcoe_rport frport;
2503         } buf;
2504         int rc;
2505
2506         fiph = (struct fip_header *)skb->data;
2507         sub = fiph->fip_subcode;
2508
2509         rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata);
2510         if (rc) {
2511                 LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
2512                 goto drop;
2513         }
2514
2515         mutex_lock(&fip->ctlr_mutex);
2516         switch (sub) {
2517         case FIP_SC_VN_PROBE_REQ:
2518                 fcoe_ctlr_vn_probe_req(fip, &buf.rdata);
2519                 break;
2520         case FIP_SC_VN_PROBE_REP:
2521                 fcoe_ctlr_vn_probe_reply(fip, &buf.rdata);
2522                 break;
2523         case FIP_SC_VN_CLAIM_NOTIFY:
2524                 fcoe_ctlr_vn_claim_notify(fip, &buf.rdata);
2525                 break;
2526         case FIP_SC_VN_CLAIM_REP:
2527                 fcoe_ctlr_vn_claim_resp(fip, &buf.rdata);
2528                 break;
2529         case FIP_SC_VN_BEACON:
2530                 fcoe_ctlr_vn_beacon(fip, &buf.rdata);
2531                 break;
2532         default:
2533                 LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
2534                 rc = -1;
2535                 break;
2536         }
2537         mutex_unlock(&fip->ctlr_mutex);
2538 drop:
2539         kfree_skb(skb);
2540         return rc;
2541 }
2542
2543 /**
2544  * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
2545  * @lport: The local port
2546  * @fp: The received frame
2547  *
2548  * This should never be called since we don't see RSCNs or other
2549  * fabric-generated ELSes.
2550  */
2551 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
2552 {
2553         struct fc_seq_els_data rjt_data;
2554
2555         rjt_data.reason = ELS_RJT_UNSUP;
2556         rjt_data.explan = ELS_EXPL_NONE;
2557         lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
2558         fc_frame_free(fp);
2559 }
2560
2561 /**
2562  * fcoe_ctlr_disc_recv - start discovery for VN2VN mode.
2563  * @fip: The FCoE controller
2564  *
2565  * This sets a flag indicating that remote ports should be created
2566  * and started for the peers we discover.  We use the disc_callback
2567  * pointer as that flag.  Peers already discovered are created here.
2568  *
2569  * The lport lock is held during this call. The callback must be done
2570  * later, without holding either the lport or discovery locks.
2571  * The fcoe_ctlr lock may also be held during this call.
2572  */
2573 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
2574                                                   enum fc_disc_event),
2575                                  struct fc_lport *lport)
2576 {
2577         struct fc_disc *disc = &lport->disc;
2578         struct fcoe_ctlr *fip = disc->priv;
2579
2580         mutex_lock(&disc->disc_mutex);
2581         disc->disc_callback = callback;
2582         disc->disc_id = (disc->disc_id + 2) | 1;
2583         disc->pending = 1;
2584         schedule_work(&fip->timer_work);
2585         mutex_unlock(&disc->disc_mutex);
2586 }
2587
2588 /**
2589  * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
2590  * @fip: The FCoE controller
2591  *
2592  * Starts the FLOGI and PLOGI login process to each discovered rport for which
2593  * we've received at least one beacon.
2594  * Performs the discovery complete callback.
2595  */
2596 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
2597 {
2598         struct fc_lport *lport = fip->lp;
2599         struct fc_disc *disc = &lport->disc;
2600         struct fc_rport_priv *rdata;
2601         struct fcoe_rport *frport;
2602         void (*callback)(struct fc_lport *, enum fc_disc_event);
2603
2604         mutex_lock(&disc->disc_mutex);
2605         callback = disc->pending ? disc->disc_callback : NULL;
2606         disc->pending = 0;
2607         list_for_each_entry_rcu(rdata, &disc->rports, peers) {
2608                 frport = fcoe_ctlr_rport(rdata);
2609                 if (frport->time)
2610                         lport->tt.rport_login(rdata);
2611         }
2612         mutex_unlock(&disc->disc_mutex);
2613         if (callback)
2614                 callback(lport, DISC_EV_SUCCESS);
2615 }
2616
2617 /**
2618  * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
2619  * @fip: The FCoE controller
2620  */
2621 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
2622 {
2623         unsigned long next_time;
2624         u8 mac[ETH_ALEN];
2625         u32 new_port_id = 0;
2626
2627         mutex_lock(&fip->ctlr_mutex);
2628         switch (fip->state) {
2629         case FIP_ST_VNMP_START:
2630                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
2631                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2632                 next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
2633                 break;
2634         case FIP_ST_VNMP_PROBE1:
2635                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
2636                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2637                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2638                 break;
2639         case FIP_ST_VNMP_PROBE2:
2640                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
2641                 new_port_id = fip->port_id;
2642                 hton24(mac, FIP_VN_FC_MAP);
2643                 hton24(mac + 3, new_port_id);
2644                 fcoe_ctlr_map_dest(fip);
2645                 fip->update_mac(fip->lp, mac);
2646                 fcoe_ctlr_vn_send_claim(fip);
2647                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2648                 break;
2649         case FIP_ST_VNMP_CLAIM:
2650                 /*
2651                  * This may be invoked either by starting discovery so don't
2652                  * go to the next state unless it's been long enough.
2653                  */
2654                 next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2655                 if (time_after_eq(jiffies, next_time)) {
2656                         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
2657                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2658                                           fcoe_all_vn2vn, 0);
2659                         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2660                         fip->port_ka_time = next_time;
2661                 }
2662                 fcoe_ctlr_vn_disc(fip);
2663                 break;
2664         case FIP_ST_VNMP_UP:
2665                 next_time = fcoe_ctlr_vn_age(fip);
2666                 if (time_after_eq(jiffies, fip->port_ka_time)) {
2667                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2668                                           fcoe_all_vn2vn, 0);
2669                         fip->port_ka_time = jiffies +
2670                                  msecs_to_jiffies(FIP_VN_BEACON_INT +
2671                                         (random32() % FIP_VN_BEACON_FUZZ));
2672                 }
2673                 if (time_before(fip->port_ka_time, next_time))
2674                         next_time = fip->port_ka_time;
2675                 break;
2676         case FIP_ST_LINK_WAIT:
2677                 goto unlock;
2678         default:
2679                 WARN(1, "unexpected state %d\n", fip->state);
2680                 goto unlock;
2681         }
2682         mod_timer(&fip->timer, next_time);
2683 unlock:
2684         mutex_unlock(&fip->ctlr_mutex);
2685
2686         /* If port ID is new, notify local port after dropping ctlr_mutex */
2687         if (new_port_id)
2688                 fc_lport_set_local_id(fip->lp, new_port_id);
2689 }
2690
2691 /**
2692  * fcoe_libfc_config() - Sets up libfc related properties for local port
2693  * @lp: The local port to configure libfc for
2694  * @fip: The FCoE controller in use by the local port
2695  * @tt: The libfc function template
2696  * @init_fcp: If non-zero, the FCP portion of libfc should be initialized
2697  *
2698  * Returns : 0 for success
2699  */
2700 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
2701                       const struct libfc_function_template *tt, int init_fcp)
2702 {
2703         /* Set the function pointers set by the LLDD */
2704         memcpy(&lport->tt, tt, sizeof(*tt));
2705         if (init_fcp && fc_fcp_init(lport))
2706                 return -ENOMEM;
2707         fc_exch_init(lport);
2708         fc_elsct_init(lport);
2709         fc_lport_init(lport);
2710         if (fip->mode == FIP_MODE_VN2VN)
2711                 lport->rport_priv_size = sizeof(struct fcoe_rport);
2712         fc_rport_init(lport);
2713         if (fip->mode == FIP_MODE_VN2VN) {
2714                 lport->point_to_multipoint = 1;
2715                 lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
2716                 lport->tt.disc_start = fcoe_ctlr_disc_start;
2717                 lport->tt.disc_stop = fcoe_ctlr_disc_stop;
2718                 lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
2719                 mutex_init(&lport->disc.disc_mutex);
2720                 INIT_LIST_HEAD(&lport->disc.rports);
2721                 lport->disc.priv = fip;
2722         } else {
2723                 fc_disc_init(lport);
2724         }
2725         return 0;
2726 }
2727 EXPORT_SYMBOL_GPL(fcoe_libfc_config);