drivers/scsi/fcoe/libfcoe.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/netdevice.h>
  33 #include <linux/errno.h>
  34 #include <linux/bitops.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
  43 #include <scsi/libfc.h>
  44 #include <scsi/libfcoe.h>
  45
  46 MODULE_AUTHOR("Open-FCoE.org");
  47 MODULE_DESCRIPTION("FIP discovery protocol support for FCoE HBAs");
  48 MODULE_LICENSE("GPL v2");
  49
  50 #define FCOE_CTLR_MIN_FKA       500             /* min keep alive (mS) */
  51 #define FCOE_CTLR_DEF_FKA       FIP_DEF_FKA     /* default keep alive (mS) */
  52
  53 static void fcoe_ctlr_timeout(unsigned long);
  54 static void fcoe_ctlr_link_work(struct work_struct *);
  55 static void fcoe_ctlr_recv_work(struct work_struct *);
  56
  57 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
  58
  59 unsigned int libfcoe_debug_logging;
  60 module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR);
  61 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
  62
  63 #define LIBFCOE_LOGGING     0x01 /* General logging, not categorized */
  64 #define LIBFCOE_FIP_LOGGING 0x02 /* FIP logging */
  65
  66 #define LIBFCOE_CHECK_LOGGING(LEVEL, CMD)                               \
  67 do {                                                                    \
  68         if (unlikely(libfcoe_debug_logging & LEVEL))                    \
  69                 do {                                                    \
  70                         CMD;                                            \
  71                 } while (0);                                            \
  72 } while (0);
  73
  74 #define LIBFCOE_DBG(fmt, args...)                                       \
  75         LIBFCOE_CHECK_LOGGING(LIBFCOE_LOGGING,                          \
  76                               printk(KERN_INFO "libfcoe: " fmt, ##args);)
  77
  78 #define LIBFCOE_FIP_DBG(fmt, args...)                                   \
  79         LIBFCOE_CHECK_LOGGING(LIBFCOE_FIP_LOGGING,                      \
  80                               printk(KERN_INFO "fip: " fmt, ##args);)
  81
  82 /*
  83  * Return non-zero if FCF fcoe_size has been validated.
  84  */
  85 static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
  86 {
  87         return (fcf->flags & FIP_FL_SOL) != 0;
  88 }
  89
  90 /*
  91  * Return non-zero if the FCF is usable.
  92  */
  93 static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
  94 {
  95         u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
  96
  97         return (fcf->flags & flags) == flags;
  98 }
  99
 100 /**
 101  * fcoe_ctlr_init() - Initialize the FCoE Controller instance.
 102  * @fip:        FCoE controller.
 103  */
 104 void fcoe_ctlr_init(struct fcoe_ctlr *fip)
 105 {
 106         fip->state = FIP_ST_LINK_WAIT;
 107         INIT_LIST_HEAD(&fip->fcfs);
 108         spin_lock_init(&fip->lock);
 109         fip->flogi_oxid = FC_XID_UNKNOWN;
 110         setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
 111         INIT_WORK(&fip->link_work, fcoe_ctlr_link_work);
 112         INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
 113         skb_queue_head_init(&fip->fip_recv_list);
 114 }
 115 EXPORT_SYMBOL(fcoe_ctlr_init);
 116
 117 /**
 118  * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller.
 119  * @fip:        FCoE controller.
 120  *
 121  * Called with &fcoe_ctlr lock held.
 122  */
 123 static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
 124 {
 125         struct fcoe_fcf *fcf;
 126         struct fcoe_fcf *next;
 127
 128         fip->sel_fcf = NULL;
 129         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 130                 list_del(&fcf->list);
 131                 kfree(fcf);
 132         }
 133         fip->fcf_count = 0;
 134         fip->sel_time = 0;
 135 }
 136
 137 /**
 138  * fcoe_ctlr_destroy() - Disable and tear-down the FCoE controller.
 139  * @fip:        FCoE controller.
 140  *
 141  * This is called by FCoE drivers before freeing the &fcoe_ctlr.
 142  *
 143  * The receive handler will have been deleted before this to guarantee
 144  * that no more recv_work will be scheduled.
 145  *
 146  * The timer routine will simply return once we set FIP_ST_DISABLED.
 147  * This guarantees that no further timeouts or work will be scheduled.
 148  */
 149 void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
 150 {
 151         flush_work(&fip->recv_work);
 152         spin_lock_bh(&fip->lock);
 153         fip->state = FIP_ST_DISABLED;
 154         fcoe_ctlr_reset_fcfs(fip);
 155         spin_unlock_bh(&fip->lock);
 156         del_timer_sync(&fip->timer);
 157         flush_work(&fip->link_work);
 158 }
 159 EXPORT_SYMBOL(fcoe_ctlr_destroy);
 160
 161 /**
 162  * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port.
 163  * @fip:        FCoE controller.
 164  *
 165  * Returns the maximum packet size including the FCoE header and trailer,
 166  * but not including any Ethernet or VLAN headers.
 167  */
 168 static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
 169 {
 170         /*
 171          * Determine the max FCoE frame size allowed, including
 172          * FCoE header and trailer.
 173          * Note:  lp->mfs is currently the payload size, not the frame size.
 174          */
 175         return fip->lp->mfs + sizeof(struct fc_frame_header) +
 176                 sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
 177 }
 178
 179 /**
 180  * fcoe_ctlr_solicit() - Send a solicitation.
 181  * @fip:        FCoE controller.
 182  * @fcf:        Destination FCF.  If NULL, a multicast solicitation is sent.
 183  */
 184 static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
 185 {
 186         struct sk_buff *skb;
 187         struct fip_sol {
 188                 struct ethhdr eth;
 189                 struct fip_header fip;
 190                 struct {
 191                         struct fip_mac_desc mac;
 192                         struct fip_wwn_desc wwnn;
 193                         struct fip_size_desc size;
 194                 } __attribute__((packed)) desc;
 195         }  __attribute__((packed)) *sol;
 196         u32 fcoe_size;
 197
 198         skb = dev_alloc_skb(sizeof(*sol));
 199         if (!skb)
 200                 return;
 201
 202         sol = (struct fip_sol *)skb->data;
 203
 204         memset(sol, 0, sizeof(*sol));
 205         memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
 206         memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 207         sol->eth.h_proto = htons(ETH_P_FIP);
 208
 209         sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 210         sol->fip.fip_op = htons(FIP_OP_DISC);
 211         sol->fip.fip_subcode = FIP_SC_SOL;
 212         sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
 213         sol->fip.fip_flags = htons(FIP_FL_FPMA);
 214         if (fip->spma)
 215                 sol->fip.fip_flags |= htons(FIP_FL_SPMA);
 216
 217         sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
 218         sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
 219         memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 220
 221         sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
 222         sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
 223         put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
 224
 225         fcoe_size = fcoe_ctlr_fcoe_size(fip);
 226         sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
 227         sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
 228         sol->desc.size.fd_size = htons(fcoe_size);
 229
 230         skb_put(skb, sizeof(*sol));
 231         skb->protocol = htons(ETH_P_FIP);
 232         skb_reset_mac_header(skb);
 233         skb_reset_network_header(skb);
 234         fip->send(fip, skb);
 235
 236         if (!fcf)
 237                 fip->sol_time = jiffies;
 238 }
 239
 240 /**
 241  * fcoe_ctlr_link_up() - Start FCoE controller.
 242  * @fip:        FCoE controller.
 243  *
 244  * Called from the LLD when the network link is ready.
 245  */
 246 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
 247 {
 248         spin_lock_bh(&fip->lock);
 249         if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
 250                 fip->last_link = 1;
 251                 fip->link = 1;
 252                 spin_unlock_bh(&fip->lock);
 253                 fc_linkup(fip->lp);
 254         } else if (fip->state == FIP_ST_LINK_WAIT) {
 255                 fip->state = FIP_ST_AUTO;
 256                 fip->last_link = 1;
 257                 fip->link = 1;
 258                 spin_unlock_bh(&fip->lock);
 259                 LIBFCOE_FIP_DBG("%s", "setting AUTO mode.\n");
 260                 fc_linkup(fip->lp);
 261                 fcoe_ctlr_solicit(fip, NULL);
 262         } else
 263                 spin_unlock_bh(&fip->lock);
 264 }
 265 EXPORT_SYMBOL(fcoe_ctlr_link_up);
 266
 267 /**
 268  * fcoe_ctlr_reset() - Reset FIP.
 269  * @fip:        FCoE controller.
 270  * @new_state:  FIP state to be entered.
 271  *
 272  * Returns non-zero if the link was up and now isn't.
 273  */
 274 static int fcoe_ctlr_reset(struct fcoe_ctlr *fip, enum fip_state new_state)
 275 {
 276         struct fc_lport *lp = fip->lp;
 277         int link_dropped;
 278
 279         spin_lock_bh(&fip->lock);
 280         fcoe_ctlr_reset_fcfs(fip);
 281         del_timer(&fip->timer);
 282         fip->state = new_state;
 283         fip->ctlr_ka_time = 0;
 284         fip->port_ka_time = 0;
 285         fip->sol_time = 0;
 286         fip->flogi_oxid = FC_XID_UNKNOWN;
 287         fip->map_dest = 0;
 288         fip->last_link = 0;
 289         link_dropped = fip->link;
 290         fip->link = 0;
 291         spin_unlock_bh(&fip->lock);
 292
 293         if (link_dropped)
 294                 fc_linkdown(lp);
 295
 296         if (new_state == FIP_ST_ENABLED) {
 297                 fcoe_ctlr_solicit(fip, NULL);
 298                 fc_linkup(lp);
 299                 link_dropped = 0;
 300         }
 301         return link_dropped;
 302 }
 303
 304 /**
 305  * fcoe_ctlr_link_down() - Stop FCoE controller.
 306  * @fip:        FCoE controller.
 307  *
 308  * Returns non-zero if the link was up and now isn't.
 309  *
 310  * Called from the LLD when the network link is not ready.
 311  * There may be multiple calls while the link is down.
 312  */
 313 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
 314 {
 315         return fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
 316 }
 317 EXPORT_SYMBOL(fcoe_ctlr_link_down);
 318
 319 /**
 320  * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF.
 321  * @fip:        FCoE controller.
 322  * @ports:      0 for controller keep-alive, 1 for port keep-alive.
 323  * @sa:         source MAC address.
 324  *
 325  * A controller keep-alive is sent every fka_period (typically 8 seconds).
 326  * The source MAC is the native MAC address.
 327  *
 328  * A port keep-alive is sent every 90 seconds while logged in.
 329  * The source MAC is the assigned mapped source address.
 330  * The destination is the FCF's F-port.
 331  */
 332 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip, int ports, u8 *sa)
 333 {
 334         struct sk_buff *skb;
 335         struct fip_kal {
 336                 struct ethhdr eth;
 337                 struct fip_header fip;
 338                 struct fip_mac_desc mac;
 339         } __attribute__((packed)) *kal;
 340         struct fip_vn_desc *vn;
 341         u32 len;
 342         struct fc_lport *lp;
 343         struct fcoe_fcf *fcf;
 344
 345         fcf = fip->sel_fcf;
 346         lp = fip->lp;
 347         if (!fcf || !fc_host_port_id(lp->host))
 348                 return;
 349
 350         len = fcoe_ctlr_fcoe_size(fip) + sizeof(struct ethhdr);
 351         BUG_ON(len < sizeof(*kal) + sizeof(*vn));
 352         skb = dev_alloc_skb(len);
 353         if (!skb)
 354                 return;
 355
 356         kal = (struct fip_kal *)skb->data;
 357         memset(kal, 0, len);
 358         memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 359         memcpy(kal->eth.h_source, sa, ETH_ALEN);
 360         kal->eth.h_proto = htons(ETH_P_FIP);
 361
 362         kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 363         kal->fip.fip_op = htons(FIP_OP_CTRL);
 364         kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
 365         kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
 366                                     ports * sizeof(*vn)) / FIP_BPW);
 367         kal->fip.fip_flags = htons(FIP_FL_FPMA);
 368         if (fip->spma)
 369                 kal->fip.fip_flags |= htons(FIP_FL_SPMA);
 370
 371         kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
 372         kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
 373         memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 374
 375         if (ports) {
 376                 vn = (struct fip_vn_desc *)(kal + 1);
 377                 vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
 378                 vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
 379                 memcpy(vn->fd_mac, fip->data_src_addr, ETH_ALEN);
 380                 hton24(vn->fd_fc_id, fc_host_port_id(lp->host));
 381                 put_unaligned_be64(lp->wwpn, &vn->fd_wwpn);
 382         }
 383
 384         skb_put(skb, len);
 385         skb->protocol = htons(ETH_P_FIP);
 386         skb_reset_mac_header(skb);
 387         skb_reset_network_header(skb);
 388         fip->send(fip, skb);
 389 }
 390
 391 /**
 392  * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it.
 393  * @fip:        FCoE controller.
 394  * @dtype:      FIP descriptor type for the frame.
 395  * @skb:        FCoE ELS frame including FC header but no FCoE headers.
 396  *
 397  * Returns non-zero error code on failure.
 398  *
 399  * The caller must check that the length is a multiple of 4.
 400  *
 401  * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
 402  * Headroom includes the FIP encapsulation description, FIP header, and
 403  * Ethernet header.  The tailroom is for the FIP MAC descriptor.
 404  */
 405 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip,
 406                             u8 dtype, struct sk_buff *skb)
 407 {
 408         struct fip_encaps_head {
 409                 struct ethhdr eth;
 410                 struct fip_header fip;
 411                 struct fip_encaps encaps;
 412         } __attribute__((packed)) *cap;
 413         struct fip_mac_desc *mac;
 414         struct fcoe_fcf *fcf;
 415         size_t dlen;
 416
 417         fcf = fip->sel_fcf;
 418         if (!fcf)
 419                 return -ENODEV;
 420         dlen = sizeof(struct fip_encaps) + skb->len;    /* len before push */
 421         cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));
 422
 423         memset(cap, 0, sizeof(*cap));
 424         memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 425         memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 426         cap->eth.h_proto = htons(ETH_P_FIP);
 427
 428         cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 429         cap->fip.fip_op = htons(FIP_OP_LS);
 430         cap->fip.fip_subcode = FIP_SC_REQ;
 431         cap->fip.fip_dl_len = htons((dlen + sizeof(*mac)) / FIP_BPW);
 432         cap->fip.fip_flags = htons(FIP_FL_FPMA);
 433         if (fip->spma)
 434                 cap->fip.fip_flags |= htons(FIP_FL_SPMA);
 435
 436         cap->encaps.fd_desc.fip_dtype = dtype;
 437         cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
 438
 439         mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
 440         memset(mac, 0, sizeof(mac));
 441         mac->fd_desc.fip_dtype = FIP_DT_MAC;
 442         mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
 443         if (dtype != FIP_DT_FLOGI)
 444                 memcpy(mac->fd_mac, fip->data_src_addr, ETH_ALEN);
 445         else if (fip->spma)
 446                 memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
 447
 448         skb->protocol = htons(ETH_P_FIP);
 449         skb_reset_mac_header(skb);
 450         skb_reset_network_header(skb);
 451         return 0;
 452 }
 453
 454 /**
 455  * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
 456  * @fip:        FCoE controller.
 457  * @skb:        FCoE ELS frame including FC header but no FCoE headers.
 458  *
 459  * Returns a non-zero error code if the frame should not be sent.
 460  * Returns zero if the caller should send the frame with FCoE encapsulation.
 461  *
 462  * The caller must check that the length is a multiple of 4.
 463  * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
 464  */
 465 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
 466 {
 467         struct fc_frame_header *fh;
 468         u16 old_xid;
 469         u8 op;
 470
 471         fh = (struct fc_frame_header *)skb->data;
 472         op = *(u8 *)(fh + 1);
 473
 474         if (op == ELS_FLOGI) {
 475                 old_xid = fip->flogi_oxid;
 476                 fip->flogi_oxid = ntohs(fh->fh_ox_id);
 477                 if (fip->state == FIP_ST_AUTO) {
 478                         if (old_xid == FC_XID_UNKNOWN)
 479                                 fip->flogi_count = 0;
 480                         fip->flogi_count++;
 481                         if (fip->flogi_count < 3)
 482                                 goto drop;
 483                         fip->map_dest = 1;
 484                         return 0;
 485                 }
 486                 if (fip->state == FIP_ST_NON_FIP)
 487                         fip->map_dest = 1;
 488         }
 489
 490         if (fip->state == FIP_ST_NON_FIP)
 491                 return 0;
 492
 493         switch (op) {
 494         case ELS_FLOGI:
 495                 op = FIP_DT_FLOGI;
 496                 break;
 497         case ELS_FDISC:
 498                 if (ntoh24(fh->fh_s_id))
 499                         return 0;
 500                 op = FIP_DT_FDISC;
 501                 break;
 502         case ELS_LOGO:
 503                 if (fip->state != FIP_ST_ENABLED)
 504                         return 0;
 505                 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
 506                         return 0;
 507                 op = FIP_DT_LOGO;
 508                 break;
 509         case ELS_LS_ACC:
 510                 if (fip->flogi_oxid == FC_XID_UNKNOWN)
 511                         return 0;
 512                 if (!ntoh24(fh->fh_s_id))
 513                         return 0;
 514                 if (fip->state == FIP_ST_AUTO)
 515                         return 0;
 516                 /*
 517                  * Here we must've gotten an SID by accepting an FLOGI
 518                  * from a point-to-point connection.  Switch to using
 519                  * the source mac based on the SID.  The destination
 520                  * MAC in this case would have been set by receving the
 521                  * FLOGI.
 522                  */
 523                 fip->flogi_oxid = FC_XID_UNKNOWN;
 524                 fc_fcoe_set_mac(fip->data_src_addr, fh->fh_s_id);
 525                 return 0;
 526         default:
 527                 if (fip->state != FIP_ST_ENABLED)
 528                         goto drop;
 529                 return 0;
 530         }
 531         if (fcoe_ctlr_encaps(fip, op, skb))
 532                 goto drop;
 533         fip->send(fip, skb);
 534         return -EINPROGRESS;
 535 drop:
 536         kfree_skb(skb);
 537         return -EINVAL;
 538 }
 539 EXPORT_SYMBOL(fcoe_ctlr_els_send);
 540
 541 /*
 542  * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller.
 543  * @fip:        FCoE controller.
 544  *
 545  * Called with lock held.
 546  *
 547  * An FCF is considered old if we have missed three advertisements.
 548  * That is, there have been no valid advertisement from it for three
 549  * times its keep-alive period including fuzz.
 550  *
 551  * In addition, determine the time when an FCF selection can occur.
 552  */
 553 static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
 554 {
 555         struct fcoe_fcf *fcf;
 556         struct fcoe_fcf *next;
 557         unsigned long sel_time = 0;
 558
 559         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 560                 if (time_after(jiffies, fcf->time + fcf->fka_period * 3 +
 561                                msecs_to_jiffies(FIP_FCF_FUZZ * 3))) {
 562                         if (fip->sel_fcf == fcf)
 563                                 fip->sel_fcf = NULL;
 564                         list_del(&fcf->list);
 565                         WARN_ON(!fip->fcf_count);
 566                         fip->fcf_count--;
 567                         kfree(fcf);
 568                 } else if (fcoe_ctlr_mtu_valid(fcf) &&
 569                            (!sel_time || time_before(sel_time, fcf->time))) {
 570                         sel_time = fcf->time;
 571                 }
 572         }
 573         if (sel_time) {
 574                 sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
 575                 fip->sel_time = sel_time;
 576                 if (time_before(sel_time, fip->timer.expires))
 577                         mod_timer(&fip->timer, sel_time);
 578         } else {
 579                 fip->sel_time = 0;
 580         }
 581 }
 582
 583 /**
 584  * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry.
 585  * @skb:        received FIP advertisement frame
 586  * @fcf:        resulting FCF entry.
 587  *
 588  * Returns zero on a valid parsed advertisement,
 589  * otherwise returns non zero value.
 590  */
 591 static int fcoe_ctlr_parse_adv(struct sk_buff *skb, struct fcoe_fcf *fcf)
 592 {
 593         struct fip_header *fiph;
 594         struct fip_desc *desc = NULL;
 595         struct fip_wwn_desc *wwn;
 596         struct fip_fab_desc *fab;
 597         struct fip_fka_desc *fka;
 598         unsigned long t;
 599         size_t rlen;
 600         size_t dlen;
 601
 602         memset(fcf, 0, sizeof(*fcf));
 603         fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
 604
 605         fiph = (struct fip_header *)skb->data;
 606         fcf->flags = ntohs(fiph->fip_flags);
 607
 608         rlen = ntohs(fiph->fip_dl_len) * 4;
 609         if (rlen + sizeof(*fiph) > skb->len)
 610                 return -EINVAL;
 611
 612         desc = (struct fip_desc *)(fiph + 1);
 613         while (rlen > 0) {
 614                 dlen = desc->fip_dlen * FIP_BPW;
 615                 if (dlen < sizeof(*desc) || dlen > rlen)
 616                         return -EINVAL;
 617                 switch (desc->fip_dtype) {
 618                 case FIP_DT_PRI:
 619                         if (dlen != sizeof(struct fip_pri_desc))
 620                                 goto len_err;
 621                         fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
 622                         break;
 623                 case FIP_DT_MAC:
 624                         if (dlen != sizeof(struct fip_mac_desc))
 625                                 goto len_err;
 626                         memcpy(fcf->fcf_mac,
 627                                ((struct fip_mac_desc *)desc)->fd_mac,
 628                                ETH_ALEN);
 629                         if (!is_valid_ether_addr(fcf->fcf_mac)) {
 630                                 LIBFCOE_FIP_DBG("Invalid MAC address "
 631                                                 "in FIP adv\n");
 632                                 return -EINVAL;
 633                         }
 634                         break;
 635                 case FIP_DT_NAME:
 636                         if (dlen != sizeof(struct fip_wwn_desc))
 637                                 goto len_err;
 638                         wwn = (struct fip_wwn_desc *)desc;
 639                         fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
 640                         break;
 641                 case FIP_DT_FAB:
 642                         if (dlen != sizeof(struct fip_fab_desc))
 643                                 goto len_err;
 644                         fab = (struct fip_fab_desc *)desc;
 645                         fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
 646                         fcf->vfid = ntohs(fab->fd_vfid);
 647                         fcf->fc_map = ntoh24(fab->fd_map);
 648                         break;
 649                 case FIP_DT_FKA:
 650                         if (dlen != sizeof(struct fip_fka_desc))
 651                                 goto len_err;
 652                         fka = (struct fip_fka_desc *)desc;
 653                         t = ntohl(fka->fd_fka_period);
 654                         if (t >= FCOE_CTLR_MIN_FKA)
 655                                 fcf->fka_period = msecs_to_jiffies(t);
 656                         break;
 657                 case FIP_DT_MAP_OUI:
 658                 case FIP_DT_FCOE_SIZE:
 659                 case FIP_DT_FLOGI:
 660                 case FIP_DT_FDISC:
 661                 case FIP_DT_LOGO:
 662                 case FIP_DT_ELP:
 663                 default:
 664                         LIBFCOE_FIP_DBG("unexpected descriptor type %x "
 665                                         "in FIP adv\n", desc->fip_dtype);
 666                         /* standard says ignore unknown descriptors >= 128 */
 667                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
 668                                 return -EINVAL;
 669                         continue;
 670                 }
 671                 desc = (struct fip_desc *)((char *)desc + dlen);
 672                 rlen -= dlen;
 673         }
 674         if (!fcf->fc_map || (fcf->fc_map & 0x10000))
 675                 return -EINVAL;
 676         if (!fcf->switch_name || !fcf->fabric_name)
 677                 return -EINVAL;
 678         return 0;
 679
 680 len_err:
 681         LIBFCOE_FIP_DBG("FIP length error in descriptor type %x len %zu\n",
 682                         desc->fip_dtype, dlen);
 683         return -EINVAL;
 684 }
 685
 686 /**
 687  * fcoe_ctlr_recv_adv() - Handle an incoming advertisement.
 688  * @fip:        FCoE controller.
 689  * @skb:        Received FIP packet.
 690  */
 691 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
 692 {
 693         struct fcoe_fcf *fcf;
 694         struct fcoe_fcf new;
 695         struct fcoe_fcf *found;
 696         unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
 697         int first = 0;
 698         int mtu_valid;
 699
 700         if (fcoe_ctlr_parse_adv(skb, &new))
 701                 return;
 702
 703         spin_lock_bh(&fip->lock);
 704         first = list_empty(&fip->fcfs);
 705         found = NULL;
 706         list_for_each_entry(fcf, &fip->fcfs, list) {
 707                 if (fcf->switch_name == new.switch_name &&
 708                     fcf->fabric_name == new.fabric_name &&
 709                     fcf->fc_map == new.fc_map &&
 710                     compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) {
 711                         found = fcf;
 712                         break;
 713                 }
 714         }
 715         if (!found) {
 716                 if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
 717                         goto out;
 718
 719                 fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
 720                 if (!fcf)
 721                         goto out;
 722
 723                 fip->fcf_count++;
 724                 memcpy(fcf, &new, sizeof(new));
 725                 list_add(&fcf->list, &fip->fcfs);
 726         } else {
 727                 /*
 728                  * Flags in advertisements are ignored once the FCF is
 729                  * selected.  Flags in unsolicited advertisements are
 730                  * ignored after a usable solicited advertisement
 731                  * has been received.
 732                  */
 733                 if (fcf == fip->sel_fcf) {
 734                         fip->ctlr_ka_time -= fcf->fka_period;
 735                         fip->ctlr_ka_time += new.fka_period;
 736                         if (time_before(fip->ctlr_ka_time, fip->timer.expires))
 737                                 mod_timer(&fip->timer, fip->ctlr_ka_time);
 738                 } else if (!fcoe_ctlr_fcf_usable(fcf))
 739                         fcf->flags = new.flags;
 740                 fcf->fka_period = new.fka_period;
 741                 memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
 742         }
 743         mtu_valid = fcoe_ctlr_mtu_valid(fcf);
 744         fcf->time = jiffies;
 745         if (!found) {
 746                 LIBFCOE_FIP_DBG("New FCF for fab %llx map %x val %d\n",
 747                                 fcf->fabric_name, fcf->fc_map, mtu_valid);
 748         }
 749
 750         /*
 751          * If this advertisement is not solicited and our max receive size
 752          * hasn't been verified, send a solicited advertisement.
 753          */
 754         if (!mtu_valid)
 755                 fcoe_ctlr_solicit(fip, fcf);
 756
 757         /*
 758          * If its been a while since we did a solicit, and this is
 759          * the first advertisement we've received, do a multicast
 760          * solicitation to gather as many advertisements as we can
 761          * before selection occurs.
 762          */
 763         if (first && time_after(jiffies, fip->sol_time + sol_tov))
 764                 fcoe_ctlr_solicit(fip, NULL);
 765
 766         /*
 767          * If this is the first validated FCF, note the time and
 768          * set a timer to trigger selection.
 769          */
 770         if (mtu_valid && !fip->sel_time && fcoe_ctlr_fcf_usable(fcf)) {
 771                 fip->sel_time = jiffies +
 772                                 msecs_to_jiffies(FCOE_CTLR_START_DELAY);
 773                 if (!timer_pending(&fip->timer) ||
 774                     time_before(fip->sel_time, fip->timer.expires))
 775                         mod_timer(&fip->timer, fip->sel_time);
 776         }
 777 out:
 778         spin_unlock_bh(&fip->lock);
 779 }
 780
 781 /**
 782  * fcoe_ctlr_recv_els() - Handle an incoming FIP-encapsulated ELS frame.
 783  * @fip:        FCoE controller.
 784  * @skb:        Received FIP packet.
 785  */
 786 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
 787 {
 788         struct fc_lport *lp = fip->lp;
 789         struct fip_header *fiph;
 790         struct fc_frame *fp;
 791         struct fc_frame_header *fh = NULL;
 792         struct fip_desc *desc;
 793         struct fip_encaps *els;
 794         struct fcoe_dev_stats *stats;
 795         enum fip_desc_type els_dtype = 0;
 796         u8 els_op;
 797         u8 sub;
 798         u8 granted_mac[ETH_ALEN] = { 0 };
 799         size_t els_len = 0;
 800         size_t rlen;
 801         size_t dlen;
 802
 803         fiph = (struct fip_header *)skb->data;
 804         sub = fiph->fip_subcode;
 805         if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
 806                 goto drop;
 807
 808         rlen = ntohs(fiph->fip_dl_len) * 4;
 809         if (rlen + sizeof(*fiph) > skb->len)
 810                 goto drop;
 811
 812         desc = (struct fip_desc *)(fiph + 1);
 813         while (rlen > 0) {
 814                 dlen = desc->fip_dlen * FIP_BPW;
 815                 if (dlen < sizeof(*desc) || dlen > rlen)
 816                         goto drop;
 817                 switch (desc->fip_dtype) {
 818                 case FIP_DT_MAC:
 819                         if (dlen != sizeof(struct fip_mac_desc))
 820                                 goto len_err;
 821                         memcpy(granted_mac,
 822                                ((struct fip_mac_desc *)desc)->fd_mac,
 823                                ETH_ALEN);
 824                         if (!is_valid_ether_addr(granted_mac)) {
 825                                 LIBFCOE_FIP_DBG("Invalid MAC address "
 826                                                 "in FIP ELS\n");
 827                                 goto drop;
 828                         }
 829                         break;
 830                 case FIP_DT_FLOGI:
 831                 case FIP_DT_FDISC:
 832                 case FIP_DT_LOGO:
 833                 case FIP_DT_ELP:
 834                         if (fh)
 835                                 goto drop;
 836                         if (dlen < sizeof(*els) + sizeof(*fh) + 1)
 837                                 goto len_err;
 838                         els_len = dlen - sizeof(*els);
 839                         els = (struct fip_encaps *)desc;
 840                         fh = (struct fc_frame_header *)(els + 1);
 841                         els_dtype = desc->fip_dtype;
 842                         break;
 843                 default:
 844                         LIBFCOE_FIP_DBG("unexpected descriptor type %x "
 845                                         "in FIP adv\n", desc->fip_dtype);
 846                         /* standard says ignore unknown descriptors >= 128 */
 847                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
 848                                 goto drop;
 849                         continue;
 850                 }
 851                 desc = (struct fip_desc *)((char *)desc + dlen);
 852                 rlen -= dlen;
 853         }
 854
 855         if (!fh)
 856                 goto drop;
 857         els_op = *(u8 *)(fh + 1);
 858
 859         if (els_dtype == FIP_DT_FLOGI && sub == FIP_SC_REP &&
 860             fip->flogi_oxid == ntohs(fh->fh_ox_id) &&
 861             els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac)) {
 862                 fip->flogi_oxid = FC_XID_UNKNOWN;
 863                 fip->update_mac(fip, fip->data_src_addr, granted_mac);
 864                 memcpy(fip->data_src_addr, granted_mac, ETH_ALEN);
 865         }
 866
 867         /*
 868          * Convert skb into an fc_frame containing only the ELS.
 869          */
 870         skb_pull(skb, (u8 *)fh - skb->data);
 871         skb_trim(skb, els_len);
 872         fp = (struct fc_frame *)skb;
 873         fc_frame_init(fp);
 874         fr_sof(fp) = FC_SOF_I3;
 875         fr_eof(fp) = FC_EOF_T;
 876         fr_dev(fp) = lp;
 877
 878         stats = fc_lport_get_stats(lp);
 879         stats->RxFrames++;
 880         stats->RxWords += skb->len / FIP_BPW;
 881
 882         fc_exch_recv(lp, lp->emp, fp);
 883         return;
 884
 885 len_err:
 886         LIBFCOE_FIP_DBG("FIP length error in descriptor type %x len %zu\n",
 887                         desc->fip_dtype, dlen);
 888 drop:
 889         kfree_skb(skb);
 890 }
 891
 892 /**
 893  * fcoe_ctlr_recv_els() - Handle an incoming link reset frame.
 894  * @fip:        FCoE controller.
 895  * @fh:         Received FIP header.
 896  *
 897  * There may be multiple VN_Port descriptors.
 898  * The overall length has already been checked.
 899  */
 900 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
 901                                       struct fip_header *fh)
 902 {
 903         struct fip_desc *desc;
 904         struct fip_mac_desc *mp;
 905         struct fip_wwn_desc *wp;
 906         struct fip_vn_desc *vp;
 907         size_t rlen;
 908         size_t dlen;
 909         struct fcoe_fcf *fcf = fip->sel_fcf;
 910         struct fc_lport *lp = fip->lp;
 911         u32     desc_mask;
 912
 913         LIBFCOE_FIP_DBG("Clear Virtual Link received\n");
 914         if (!fcf)
 915                 return;
 916         if (!fcf || !fc_host_port_id(lp->host))
 917                 return;
 918
 919         /*
 920          * mask of required descriptors.  Validating each one clears its bit.
 921          */
 922         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | BIT(FIP_DT_VN_ID);
 923
 924         rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
 925         desc = (struct fip_desc *)(fh + 1);
 926         while (rlen >= sizeof(*desc)) {
 927                 dlen = desc->fip_dlen * FIP_BPW;
 928                 if (dlen > rlen)
 929                         return;
 930                 switch (desc->fip_dtype) {
 931                 case FIP_DT_MAC:
 932                         mp = (struct fip_mac_desc *)desc;
 933                         if (dlen < sizeof(*mp))
 934                                 return;
 935                         if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
 936                                 return;
 937                         desc_mask &= ~BIT(FIP_DT_MAC);
 938                         break;
 939                 case FIP_DT_NAME:
 940                         wp = (struct fip_wwn_desc *)desc;
 941                         if (dlen < sizeof(*wp))
 942                                 return;
 943                         if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
 944                                 return;
 945                         desc_mask &= ~BIT(FIP_DT_NAME);
 946                         break;
 947                 case FIP_DT_VN_ID:
 948                         vp = (struct fip_vn_desc *)desc;
 949                         if (dlen < sizeof(*vp))
 950                                 return;
 951                         if (compare_ether_addr(vp->fd_mac,
 952                             fip->data_src_addr) == 0 &&
 953                             get_unaligned_be64(&vp->fd_wwpn) == lp->wwpn &&
 954                             ntoh24(vp->fd_fc_id) == fc_host_port_id(lp->host))
 955                                 desc_mask &= ~BIT(FIP_DT_VN_ID);
 956                         break;
 957                 default:
 958                         /* standard says ignore unknown descriptors >= 128 */
 959                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
 960                                 return;
 961                         break;
 962                 }
 963                 desc = (struct fip_desc *)((char *)desc + dlen);
 964                 rlen -= dlen;
 965         }
 966
 967         /*
 968          * reset only if all required descriptors were present and valid.
 969          */
 970         if (desc_mask) {
 971                 LIBFCOE_FIP_DBG("missing descriptors mask %x\n", desc_mask);
 972         } else {
 973                 LIBFCOE_FIP_DBG("performing Clear Virtual Link\n");
 974                 fcoe_ctlr_reset(fip, FIP_ST_ENABLED);
 975         }
 976 }
 977
 978 /**
 979  * fcoe_ctlr_recv() - Receive a FIP frame.
 980  * @fip:        FCoE controller.
 981  * @skb:        Received FIP packet.
 982  *
 983  * This is called from NET_RX_SOFTIRQ.
 984  */
 985 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
 986 {
 987         spin_lock_bh(&fip->fip_recv_list.lock);
 988         __skb_queue_tail(&fip->fip_recv_list, skb);
 989         spin_unlock_bh(&fip->fip_recv_list.lock);
 990         schedule_work(&fip->recv_work);
 991 }
 992 EXPORT_SYMBOL(fcoe_ctlr_recv);
 993
 994 /**
 995  * fcoe_ctlr_recv_handler() - Receive a FIP frame.
 996  * @fip:        FCoE controller.
 997  * @skb:        Received FIP packet.
 998  *
 999  * Returns non-zero if the frame is dropped.
1000  */
1001 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
1002 {
1003         struct fip_header *fiph;
1004         struct ethhdr *eh;
1005         enum fip_state state;
1006         u16 op;
1007         u8 sub;
1008
1009         if (skb_linearize(skb))
1010                 goto drop;
1011         if (skb->len < sizeof(*fiph))
1012                 goto drop;
1013         eh = eth_hdr(skb);
1014         if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1015             compare_ether_addr(eh->h_dest, FIP_ALL_ENODE_MACS))
1016                 goto drop;
1017         fiph = (struct fip_header *)skb->data;
1018         op = ntohs(fiph->fip_op);
1019         sub = fiph->fip_subcode;
1020
1021         if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
1022                 goto drop;
1023         if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
1024                 goto drop;
1025
1026         spin_lock_bh(&fip->lock);
1027         state = fip->state;
1028         if (state == FIP_ST_AUTO) {
1029                 fip->map_dest = 0;
1030                 fip->state = FIP_ST_ENABLED;
1031                 state = FIP_ST_ENABLED;
1032                 LIBFCOE_FIP_DBG("Using FIP mode\n");
1033         }
1034         spin_unlock_bh(&fip->lock);
1035         if (state != FIP_ST_ENABLED)
1036                 goto drop;
1037
1038         if (op == FIP_OP_LS) {
1039                 fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
1040                 return 0;
1041         }
1042         if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
1043                 fcoe_ctlr_recv_adv(fip, skb);
1044         else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
1045                 fcoe_ctlr_recv_clr_vlink(fip, fiph);
1046         kfree_skb(skb);
1047         return 0;
1048 drop:
1049         kfree_skb(skb);
1050         return -1;
1051 }
1052
1053 /**
1054  * fcoe_ctlr_select() - Select the best FCF, if possible.
1055  * @fip:        FCoE controller.
1056  *
1057  * If there are conflicting advertisements, no FCF can be chosen.
1058  *
1059  * Called with lock held.
1060  */
1061 static void fcoe_ctlr_select(struct fcoe_ctlr *fip)
1062 {
1063         struct fcoe_fcf *fcf;
1064         struct fcoe_fcf *best = NULL;
1065
1066         list_for_each_entry(fcf, &fip->fcfs, list) {
1067                 LIBFCOE_FIP_DBG("consider FCF for fab %llx VFID %d map %x "
1068                                 "val %d\n", fcf->fabric_name, fcf->vfid,
1069                                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf));
1070                 if (!fcoe_ctlr_fcf_usable(fcf)) {
1071                         LIBFCOE_FIP_DBG("FCF for fab %llx map %x %svalid "
1072                                         "%savailable\n", fcf->fabric_name,
1073                                         fcf->fc_map, (fcf->flags & FIP_FL_SOL)
1074                                         ? "" : "in", (fcf->flags & FIP_FL_AVAIL)
1075                                         ? "" : "un");
1076                         continue;
1077                 }
1078                 if (!best) {
1079                         best = fcf;
1080                         continue;
1081                 }
1082                 if (fcf->fabric_name != best->fabric_name ||
1083                     fcf->vfid != best->vfid ||
1084                     fcf->fc_map != best->fc_map) {
1085                         LIBFCOE_FIP_DBG("Conflicting fabric, VFID, "
1086                                         "or FC-MAP\n");
1087                         return;
1088                 }
1089                 if (fcf->pri < best->pri)
1090                         best = fcf;
1091         }
1092         fip->sel_fcf = best;
1093 }
1094
1095 /**
1096  * fcoe_ctlr_timeout() - FIP timer function.
1097  * @arg:        &fcoe_ctlr pointer.
1098  *
1099  * Ages FCFs.  Triggers FCF selection if possible.  Sends keep-alives.
1100  */
1101 static void fcoe_ctlr_timeout(unsigned long arg)
1102 {
1103         struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
1104         struct fcoe_fcf *sel;
1105         struct fcoe_fcf *fcf;
1106         unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
1107         DECLARE_MAC_BUF(buf);
1108         u8 send_ctlr_ka;
1109         u8 send_port_ka;
1110
1111         spin_lock_bh(&fip->lock);
1112         if (fip->state == FIP_ST_DISABLED) {
1113                 spin_unlock_bh(&fip->lock);
1114                 return;
1115         }
1116
1117         fcf = fip->sel_fcf;
1118         fcoe_ctlr_age_fcfs(fip);
1119
1120         sel = fip->sel_fcf;
1121         if (!sel && fip->sel_time && time_after_eq(jiffies, fip->sel_time)) {
1122                 fcoe_ctlr_select(fip);
1123                 sel = fip->sel_fcf;
1124                 fip->sel_time = 0;
1125         }
1126
1127         if (sel != fcf) {
1128                 fcf = sel;              /* the old FCF may have been freed */
1129                 if (sel) {
1130                         printk(KERN_INFO "libfcoe: host%d: FIP selected "
1131                                "Fibre-Channel Forwarder MAC %s\n",
1132                                fip->lp->host->host_no,
1133                                print_mac(buf, sel->fcf_mac));
1134                         memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN);
1135                         fip->port_ka_time = jiffies +
1136                                             msecs_to_jiffies(FIP_VN_KA_PERIOD);
1137                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1138                         fip->link = 1;
1139                 } else {
1140                         printk(KERN_NOTICE "libfcoe: host%d: "
1141                                "FIP Fibre-Channel Forwarder timed out.  "
1142                                "Starting FCF discovery.\n",
1143                                fip->lp->host->host_no);
1144                         fip->link = 0;
1145                 }
1146                 schedule_work(&fip->link_work);
1147         }
1148
1149         send_ctlr_ka = 0;
1150         send_port_ka = 0;
1151         if (sel) {
1152                 if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
1153                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1154                         send_ctlr_ka = 1;
1155                 }
1156                 if (time_after(next_timer, fip->ctlr_ka_time))
1157                         next_timer = fip->ctlr_ka_time;
1158
1159                 if (time_after_eq(jiffies, fip->port_ka_time)) {
1160                         fip->port_ka_time += jiffies +
1161                                         msecs_to_jiffies(FIP_VN_KA_PERIOD);
1162                         send_port_ka = 1;
1163                 }
1164                 if (time_after(next_timer, fip->port_ka_time))
1165                         next_timer = fip->port_ka_time;
1166                 mod_timer(&fip->timer, next_timer);
1167         } else if (fip->sel_time) {
1168                 next_timer = fip->sel_time +
1169                                 msecs_to_jiffies(FCOE_CTLR_START_DELAY);
1170                 mod_timer(&fip->timer, next_timer);
1171         }
1172         spin_unlock_bh(&fip->lock);
1173
1174         if (send_ctlr_ka)
1175                 fcoe_ctlr_send_keep_alive(fip, 0, fip->ctl_src_addr);
1176         if (send_port_ka)
1177                 fcoe_ctlr_send_keep_alive(fip, 1, fip->data_src_addr);
1178 }
1179
1180 /**
1181  * fcoe_ctlr_link_work() - worker thread function for link changes.
1182  * @work:       pointer to link_work member inside &fcoe_ctlr.
1183  *
1184  * See if the link status has changed and if so, report it.
1185  *
1186  * This is here because fc_linkup() and fc_linkdown() must not
1187  * be called from the timer directly, since they use a mutex.
1188  */
1189 static void fcoe_ctlr_link_work(struct work_struct *work)
1190 {
1191         struct fcoe_ctlr *fip;
1192         int link;
1193         int last_link;
1194
1195         fip = container_of(work, struct fcoe_ctlr, link_work);
1196         spin_lock_bh(&fip->lock);
1197         last_link = fip->last_link;
1198         link = fip->link;
1199         fip->last_link = link;
1200         spin_unlock_bh(&fip->lock);
1201
1202         if (last_link != link) {
1203                 if (link)
1204                         fc_linkup(fip->lp);
1205                 else
1206                         fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
1207         }
1208 }
1209
1210 /**
1211  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames.
1212  * @recv_work:  pointer to recv_work member inside &fcoe_ctlr.
1213  */
1214 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
1215 {
1216         struct fcoe_ctlr *fip;
1217         struct sk_buff *skb;
1218
1219         fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1220         spin_lock_bh(&fip->fip_recv_list.lock);
1221         while ((skb = __skb_dequeue(&fip->fip_recv_list))) {
1222                 spin_unlock_bh(&fip->fip_recv_list.lock);
1223                 fcoe_ctlr_recv_handler(fip, skb);
1224                 spin_lock_bh(&fip->fip_recv_list.lock);
1225         }
1226         spin_unlock_bh(&fip->fip_recv_list.lock);
1227 }
1228
1229 /**
1230  * fcoe_ctlr_recv_flogi() - snoop Pre-FIP receipt of FLOGI response or request.
1231  * @fip:        FCoE controller.
1232  * @fp:         FC frame.
1233  * @sa:         Ethernet source MAC address from received FCoE frame.
1234  *
1235  * Snoop potential response to FLOGI or even incoming FLOGI.
1236  *
1237  * The caller has checked that we are waiting for login as indicated
1238  * by fip->flogi_oxid != FC_XID_UNKNOWN.
1239  *
1240  * The caller is responsible for freeing the frame.
1241  *
1242  * Return non-zero if the frame should not be delivered to libfc.
1243  */
1244 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_frame *fp, u8 *sa)
1245 {
1246         struct fc_frame_header *fh;
1247         u8 op;
1248         u8 mac[ETH_ALEN];
1249
1250         fh = fc_frame_header_get(fp);
1251         if (fh->fh_type != FC_TYPE_ELS)
1252                 return 0;
1253
1254         op = fc_frame_payload_op(fp);
1255         if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
1256             fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1257
1258                 spin_lock_bh(&fip->lock);
1259                 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
1260                         spin_unlock_bh(&fip->lock);
1261                         return -EINVAL;
1262                 }
1263                 fip->state = FIP_ST_NON_FIP;
1264                 LIBFCOE_FIP_DBG("received FLOGI LS_ACC using non-FIP mode\n");
1265
1266                 /*
1267                  * FLOGI accepted.
1268                  * If the src mac addr is FC_OUI-based, then we mark the
1269                  * address_mode flag to use FC_OUI-based Ethernet DA.
1270                  * Otherwise we use the FCoE gateway addr
1271                  */
1272                 if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
1273                         fip->map_dest = 1;
1274                 } else {
1275                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1276                         fip->map_dest = 0;
1277                 }
1278                 fip->flogi_oxid = FC_XID_UNKNOWN;
1279                 memcpy(mac, fip->data_src_addr, ETH_ALEN);
1280                 fc_fcoe_set_mac(fip->data_src_addr, fh->fh_d_id);
1281                 spin_unlock_bh(&fip->lock);
1282
1283                 fip->update_mac(fip, mac, fip->data_src_addr);
1284         } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
1285                 /*
1286                  * Save source MAC for point-to-point responses.
1287                  */
1288                 spin_lock_bh(&fip->lock);
1289                 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
1290                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1291                         fip->map_dest = 0;
1292                         if (fip->state == FIP_ST_NON_FIP)
1293                                 LIBFCOE_FIP_DBG("received FLOGI REQ, "
1294                                                 "using non-FIP mode\n");
1295                         fip->state = FIP_ST_NON_FIP;
1296                 }
1297                 spin_unlock_bh(&fip->lock);
1298         }
1299         return 0;
1300 }
1301 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
1302
1303 /**
1304  * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN.
1305  * @mac: mac address
1306  * @scheme: check port
1307  * @port: port indicator for converting
1308  *
1309  * Returns: u64 fc world wide name
1310  */
1311 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1312                       unsigned int scheme, unsigned int port)
1313 {
1314         u64 wwn;
1315         u64 host_mac;
1316
1317         /* The MAC is in NO, so flip only the low 48 bits */
1318         host_mac = ((u64) mac[0] << 40) |
1319                 ((u64) mac[1] << 32) |
1320                 ((u64) mac[2] << 24) |
1321                 ((u64) mac[3] << 16) |
1322                 ((u64) mac[4] << 8) |
1323                 (u64) mac[5];
1324
1325         WARN_ON(host_mac >= (1ULL << 48));
1326         wwn = host_mac | ((u64) scheme << 60);
1327         switch (scheme) {
1328         case 1:
1329                 WARN_ON(port != 0);
1330                 break;
1331         case 2:
1332                 WARN_ON(port >= 0xfff);
1333                 wwn |= (u64) port << 48;
1334                 break;
1335         default:
1336                 WARN_ON(1);
1337                 break;
1338         }
1339
1340         return wwn;
1341 }
1342 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1343
1344 /**
1345  * fcoe_libfc_config() - sets up libfc related properties for lport
1346  * @lp: ptr to the fc_lport
1347  * @tt: libfc function template
1348  *
1349  * Returns : 0 for success
1350  */
1351 int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
1352 {
1353         /* Set the function pointers set by the LLDD */
1354         memcpy(&lp->tt, tt, sizeof(*tt));
1355         if (fc_fcp_init(lp))
1356                 return -ENOMEM;
1357         fc_exch_init(lp);
1358         fc_elsct_init(lp);
1359         fc_lport_init(lp);
1360         fc_rport_init(lp);
1361         fc_disc_init(lp);
1362
1363         return 0;
1364 }
1365 EXPORT_SYMBOL_GPL(fcoe_libfc_config);