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->priority = fip->priority; 324 skb_reset_mac_header(skb); 325 skb_reset_network_header(skb); 326 fip->send(fip, skb); 327 328 if (!fcf) 329 fip->sol_time = jiffies; 330 } 331 332 /** 333 * fcoe_ctlr_link_up() - Start FCoE controller 334 * @fip: The FCoE controller to start 335 * 336 * Called from the LLD when the network link is ready. 337 */ 338 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip) 339 { 340 mutex_lock(&fip->ctlr_mutex); 341 if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) { 342 mutex_unlock(&fip->ctlr_mutex); 343 fc_linkup(fip->lp); 344 } else if (fip->state == FIP_ST_LINK_WAIT) { 345 fcoe_ctlr_set_state(fip, fip->mode); 346 switch (fip->mode) { 347 default: 348 LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode); 349 /* fall-through */ 350 case FIP_MODE_AUTO: 351 LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n"); 352 /* fall-through */ 353 case FIP_MODE_FABRIC: 354 case FIP_MODE_NON_FIP: 355 mutex_unlock(&fip->ctlr_mutex); 356 fc_linkup(fip->lp); 357 fcoe_ctlr_solicit(fip, NULL); 358 break; 359 case FIP_MODE_VN2VN: 360 fcoe_ctlr_vn_start(fip); 361 mutex_unlock(&fip->ctlr_mutex); 362 fc_linkup(fip->lp); 363 break; 364 } 365 } else 366 mutex_unlock(&fip->ctlr_mutex); 367 } 368 EXPORT_SYMBOL(fcoe_ctlr_link_up); 369 370 /** 371 * fcoe_ctlr_reset() - Reset a FCoE controller 372 * @fip: The FCoE controller to reset 373 */ 374 static void fcoe_ctlr_reset(struct fcoe_ctlr *fip) 375 { 376 fcoe_ctlr_reset_fcfs(fip); 377 del_timer(&fip->timer); 378 fip->ctlr_ka_time = 0; 379 fip->port_ka_time = 0; 380 fip->sol_time = 0; 381 fip->flogi_oxid = FC_XID_UNKNOWN; 382 fcoe_ctlr_map_dest(fip); 383 } 384 385 /** 386 * fcoe_ctlr_link_down() - Stop a FCoE controller 387 * @fip: The FCoE controller to be stopped 388 * 389 * Returns non-zero if the link was up and now isn't. 390 * 391 * Called from the LLD when the network link is not ready. 392 * There may be multiple calls while the link is down. 393 */ 394 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip) 395 { 396 int link_dropped; 397 398 LIBFCOE_FIP_DBG(fip, "link down.\n"); 399 mutex_lock(&fip->ctlr_mutex); 400 fcoe_ctlr_reset(fip); 401 link_dropped = fip->state != FIP_ST_LINK_WAIT; 402 fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT); 403 mutex_unlock(&fip->ctlr_mutex); 404 405 if (link_dropped) 406 fc_linkdown(fip->lp); 407 return link_dropped; 408 } 409 EXPORT_SYMBOL(fcoe_ctlr_link_down); 410 411 /** 412 * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF 413 * @fip: The FCoE controller to send the FKA on 414 * @lport: libfc fc_lport to send from 415 * @ports: 0 for controller keep-alive, 1 for port keep-alive 416 * @sa: The source MAC address 417 * 418 * A controller keep-alive is sent every fka_period (typically 8 seconds). 419 * The source MAC is the native MAC address. 420 * 421 * A port keep-alive is sent every 90 seconds while logged in. 422 * The source MAC is the assigned mapped source address. 423 * The destination is the FCF's F-port. 424 */ 425 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip, 426 struct fc_lport *lport, 427 int ports, u8 *sa) 428 { 429 struct sk_buff *skb; 430 struct fip_kal { 431 struct ethhdr eth; 432 struct fip_header fip; 433 struct fip_mac_desc mac; 434 } __packed * kal; 435 struct fip_vn_desc *vn; 436 u32 len; 437 struct fc_lport *lp; 438 struct fcoe_fcf *fcf; 439 440 fcf = fip->sel_fcf; 441 lp = fip->lp; 442 if (!fcf || (ports && !lp->port_id)) 443 return; 444 445 len = sizeof(*kal) + ports * sizeof(*vn); 446 skb = dev_alloc_skb(len); 447 if (!skb) 448 return; 449 450 kal = (struct fip_kal *)skb->data; 451 memset(kal, 0, len); 452 memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN); 453 memcpy(kal->eth.h_source, sa, ETH_ALEN); 454 kal->eth.h_proto = htons(ETH_P_FIP); 455 456 kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); 457 kal->fip.fip_op = htons(FIP_OP_CTRL); 458 kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE; 459 kal->fip.fip_dl_len = htons((sizeof(kal->mac) + 460 ports * sizeof(*vn)) / FIP_BPW); 461 kal->fip.fip_flags = htons(FIP_FL_FPMA); 462 if (fip->spma) 463 kal->fip.fip_flags |= htons(FIP_FL_SPMA); 464 465 kal->mac.fd_desc.fip_dtype = FIP_DT_MAC; 466 kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW; 467 memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); 468 if (ports) { 469 vn = (struct fip_vn_desc *)(kal + 1); 470 vn->fd_desc.fip_dtype = FIP_DT_VN_ID; 471 vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW; 472 memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN); 473 hton24(vn->fd_fc_id, lport->port_id); 474 put_unaligned_be64(lport->wwpn, &vn->fd_wwpn); 475 } 476 skb_put(skb, len); 477 skb->protocol = htons(ETH_P_FIP); 478 skb->priority = fip->priority; 479 skb_reset_mac_header(skb); 480 skb_reset_network_header(skb); 481 fip->send(fip, skb); 482 } 483 484 /** 485 * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it 486 * @fip: The FCoE controller for the ELS frame 487 * @dtype: The FIP descriptor type for the frame 488 * @skb: The FCoE ELS frame including FC header but no FCoE headers 489 * @d_id: The destination port ID. 490 * 491 * Returns non-zero error code on failure. 492 * 493 * The caller must check that the length is a multiple of 4. 494 * 495 * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes). 496 * Headroom includes the FIP encapsulation description, FIP header, and 497 * Ethernet header. The tailroom is for the FIP MAC descriptor. 498 */ 499 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport, 500 u8 dtype, struct sk_buff *skb, u32 d_id) 501 { 502 struct fip_encaps_head { 503 struct ethhdr eth; 504 struct fip_header fip; 505 struct fip_encaps encaps; 506 } __packed * cap; 507 struct fc_frame_header *fh; 508 struct fip_mac_desc *mac; 509 struct fcoe_fcf *fcf; 510 size_t dlen; 511 u16 fip_flags; 512 u8 op; 513 514 fh = (struct fc_frame_header *)skb->data; 515 op = *(u8 *)(fh + 1); 516 dlen = sizeof(struct fip_encaps) + skb->len; /* len before push */ 517 cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap)); 518 memset(cap, 0, sizeof(*cap)); 519 520 if (lport->point_to_multipoint) { 521 if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest)) 522 return -ENODEV; 523 fip_flags = 0; 524 } else { 525 fcf = fip->sel_fcf; 526 if (!fcf) 527 return -ENODEV; 528 fip_flags = fcf->flags; 529 fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA : 530 FIP_FL_FPMA; 531 if (!fip_flags) 532 return -ENODEV; 533 memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN); 534 } 535 memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN); 536 cap->eth.h_proto = htons(ETH_P_FIP); 537 538 cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); 539 cap->fip.fip_op = htons(FIP_OP_LS); 540 if (op == ELS_LS_ACC || op == ELS_LS_RJT) 541 cap->fip.fip_subcode = FIP_SC_REP; 542 else 543 cap->fip.fip_subcode = FIP_SC_REQ; 544 cap->fip.fip_flags = htons(fip_flags); 545 546 cap->encaps.fd_desc.fip_dtype = dtype; 547 cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW; 548 549 if (op != ELS_LS_RJT) { 550 dlen += sizeof(*mac); 551 mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac)); 552 memset(mac, 0, sizeof(*mac)); 553 mac->fd_desc.fip_dtype = FIP_DT_MAC; 554 mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW; 555 if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) { 556 memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN); 557 } else if (fip->mode == FIP_MODE_VN2VN) { 558 hton24(mac->fd_mac, FIP_VN_FC_MAP); 559 hton24(mac->fd_mac + 3, fip->port_id); 560 } else if (fip_flags & FIP_FL_SPMA) { 561 LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n"); 562 memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN); 563 } else { 564 LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n"); 565 /* FPMA only FLOGI. Must leave the MAC desc zeroed. */ 566 } 567 } 568 cap->fip.fip_dl_len = htons(dlen / FIP_BPW); 569 570 skb->protocol = htons(ETH_P_FIP); 571 skb->priority = fip->priority; 572 skb_reset_mac_header(skb); 573 skb_reset_network_header(skb); 574 return 0; 575 } 576 577 /** 578 * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate. 579 * @fip: FCoE controller. 580 * @lport: libfc fc_lport to send from 581 * @skb: FCoE ELS frame including FC header but no FCoE headers. 582 * 583 * Returns a non-zero error code if the frame should not be sent. 584 * Returns zero if the caller should send the frame with FCoE encapsulation. 585 * 586 * The caller must check that the length is a multiple of 4. 587 * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes). 588 * The the skb must also be an fc_frame. 589 * 590 * This is called from the lower-level driver with spinlocks held, 591 * so we must not take a mutex here. 592 */ 593 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport, 594 struct sk_buff *skb) 595 { 596 struct fc_frame *fp; 597 struct fc_frame_header *fh; 598 u16 old_xid; 599 u8 op; 600 u8 mac[ETH_ALEN]; 601 602 fp = container_of(skb, struct fc_frame, skb); 603 fh = (struct fc_frame_header *)skb->data; 604 op = *(u8 *)(fh + 1); 605 606 if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) { 607 old_xid = fip->flogi_oxid; 608 fip->flogi_oxid = ntohs(fh->fh_ox_id); 609 if (fip->state == FIP_ST_AUTO) { 610 if (old_xid == FC_XID_UNKNOWN) 611 fip->flogi_count = 0; 612 fip->flogi_count++; 613 if (fip->flogi_count < 3) 614 goto drop; 615 fcoe_ctlr_map_dest(fip); 616 return 0; 617 } 618 if (fip->state == FIP_ST_NON_FIP) 619 fcoe_ctlr_map_dest(fip); 620 } 621 622 if (fip->state == FIP_ST_NON_FIP) 623 return 0; 624 if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN) 625 goto drop; 626 switch (op) { 627 case ELS_FLOGI: 628 op = FIP_DT_FLOGI; 629 if (fip->mode == FIP_MODE_VN2VN) 630 break; 631 spin_lock_bh(&fip->ctlr_lock); 632 kfree_skb(fip->flogi_req); 633 fip->flogi_req = skb; 634 fip->flogi_req_send = 1; 635 spin_unlock_bh(&fip->ctlr_lock); 636 schedule_work(&fip->timer_work); 637 return -EINPROGRESS; 638 case ELS_FDISC: 639 if (ntoh24(fh->fh_s_id)) 640 return 0; 641 op = FIP_DT_FDISC; 642 break; 643 case ELS_LOGO: 644 if (fip->mode == FIP_MODE_VN2VN) { 645 if (fip->state != FIP_ST_VNMP_UP) 646 return -EINVAL; 647 if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI) 648 return -EINVAL; 649 } else { 650 if (fip->state != FIP_ST_ENABLED) 651 return 0; 652 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) 653 return 0; 654 } 655 op = FIP_DT_LOGO; 656 break; 657 case ELS_LS_ACC: 658 /* 659 * If non-FIP, we may have gotten an SID by accepting an FLOGI 660 * from a point-to-point connection. Switch to using 661 * the source mac based on the SID. The destination 662 * MAC in this case would have been set by receiving the 663 * FLOGI. 664 */ 665 if (fip->state == FIP_ST_NON_FIP) { 666 if (fip->flogi_oxid == FC_XID_UNKNOWN) 667 return 0; 668 fip->flogi_oxid = FC_XID_UNKNOWN; 669 fc_fcoe_set_mac(mac, fh->fh_d_id); 670 fip->update_mac(lport, mac); 671 } 672 /* fall through */ 673 case ELS_LS_RJT: 674 op = fr_encaps(fp); 675 if (op) 676 break; 677 return 0; 678 default: 679 if (fip->state != FIP_ST_ENABLED && 680 fip->state != FIP_ST_VNMP_UP) 681 goto drop; 682 return 0; 683 } 684 LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n", 685 op, ntoh24(fh->fh_d_id)); 686 if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id))) 687 goto drop; 688 fip->send(fip, skb); 689 return -EINPROGRESS; 690 drop: 691 kfree_skb(skb); 692 return -EINVAL; 693 } 694 EXPORT_SYMBOL(fcoe_ctlr_els_send); 695 696 /** 697 * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller 698 * @fip: The FCoE controller to free FCFs on 699 * 700 * Called with lock held and preemption disabled. 701 * 702 * An FCF is considered old if we have missed two advertisements. 703 * That is, there have been no valid advertisement from it for 2.5 704 * times its keep-alive period. 705 * 706 * In addition, determine the time when an FCF selection can occur. 707 * 708 * Also, increment the MissDiscAdvCount when no advertisement is received 709 * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB). 710 * 711 * Returns the time in jiffies for the next call. 712 */ 713 static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip) 714 { 715 struct fcoe_fcf *fcf; 716 struct fcoe_fcf *next; 717 unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD); 718 unsigned long deadline; 719 unsigned long sel_time = 0; 720 struct fcoe_dev_stats *stats; 721 722 stats = per_cpu_ptr(fip->lp->dev_stats, get_cpu()); 723 724 list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { 725 deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2; 726 if (fip->sel_fcf == fcf) { 727 if (time_after(jiffies, deadline)) { 728 stats->MissDiscAdvCount++; 729 printk(KERN_INFO "libfcoe: host%d: " 730 "Missing Discovery Advertisement " 731 "for fab %16.16llx count %lld\n", 732 fip->lp->host->host_no, fcf->fabric_name, 733 stats->MissDiscAdvCount); 734 } else if (time_after(next_timer, deadline)) 735 next_timer = deadline; 736 } 737 738 deadline += fcf->fka_period; 739 if (time_after_eq(jiffies, deadline)) { 740 if (fip->sel_fcf == fcf) 741 fip->sel_fcf = NULL; 742 list_del(&fcf->list); 743 WARN_ON(!fip->fcf_count); 744 fip->fcf_count--; 745 kfree(fcf); 746 stats->VLinkFailureCount++; 747 } else { 748 if (time_after(next_timer, deadline)) 749 next_timer = deadline; 750 if (fcoe_ctlr_mtu_valid(fcf) && 751 (!sel_time || time_before(sel_time, fcf->time))) 752 sel_time = fcf->time; 753 } 754 } 755 put_cpu(); 756 if (sel_time && !fip->sel_fcf && !fip->sel_time) { 757 sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY); 758 fip->sel_time = sel_time; 759 } 760 761 return next_timer; 762 } 763 764 /** 765 * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry 766 * @fip: The FCoE controller receiving the advertisement 767 * @skb: The received FIP advertisement frame 768 * @fcf: The resulting FCF entry 769 * 770 * Returns zero on a valid parsed advertisement, 771 * otherwise returns non zero value. 772 */ 773 static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip, 774 struct sk_buff *skb, struct fcoe_fcf *fcf) 775 { 776 struct fip_header *fiph; 777 struct fip_desc *desc = NULL; 778 struct fip_wwn_desc *wwn; 779 struct fip_fab_desc *fab; 780 struct fip_fka_desc *fka; 781 unsigned long t; 782 size_t rlen; 783 size_t dlen; 784 u32 desc_mask; 785 786 memset(fcf, 0, sizeof(*fcf)); 787 fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA); 788 789 fiph = (struct fip_header *)skb->data; 790 fcf->flags = ntohs(fiph->fip_flags); 791 792 /* 793 * mask of required descriptors. validating each one clears its bit. 794 */ 795 desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | 796 BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA); 797 798 rlen = ntohs(fiph->fip_dl_len) * 4; 799 if (rlen + sizeof(*fiph) > skb->len) 800 return -EINVAL; 801 802 desc = (struct fip_desc *)(fiph + 1); 803 while (rlen > 0) { 804 dlen = desc->fip_dlen * FIP_BPW; 805 if (dlen < sizeof(*desc) || dlen > rlen) 806 return -EINVAL; 807 /* Drop Adv if there are duplicate critical descriptors */ 808 if ((desc->fip_dtype < 32) && 809 !(desc_mask & 1U << desc->fip_dtype)) { 810 LIBFCOE_FIP_DBG(fip, "Duplicate Critical " 811 "Descriptors in FIP adv\n"); 812 return -EINVAL; 813 } 814 switch (desc->fip_dtype) { 815 case FIP_DT_PRI: 816 if (dlen != sizeof(struct fip_pri_desc)) 817 goto len_err; 818 fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri; 819 desc_mask &= ~BIT(FIP_DT_PRI); 820 break; 821 case FIP_DT_MAC: 822 if (dlen != sizeof(struct fip_mac_desc)) 823 goto len_err; 824 memcpy(fcf->fcf_mac, 825 ((struct fip_mac_desc *)desc)->fd_mac, 826 ETH_ALEN); 827 if (!is_valid_ether_addr(fcf->fcf_mac)) { 828 LIBFCOE_FIP_DBG(fip, 829 "Invalid MAC addr %pM in FIP adv\n", 830 fcf->fcf_mac); 831 return -EINVAL; 832 } 833 desc_mask &= ~BIT(FIP_DT_MAC); 834 break; 835 case FIP_DT_NAME: 836 if (dlen != sizeof(struct fip_wwn_desc)) 837 goto len_err; 838 wwn = (struct fip_wwn_desc *)desc; 839 fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn); 840 desc_mask &= ~BIT(FIP_DT_NAME); 841 break; 842 case FIP_DT_FAB: 843 if (dlen != sizeof(struct fip_fab_desc)) 844 goto len_err; 845 fab = (struct fip_fab_desc *)desc; 846 fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn); 847 fcf->vfid = ntohs(fab->fd_vfid); 848 fcf->fc_map = ntoh24(fab->fd_map); 849 desc_mask &= ~BIT(FIP_DT_FAB); 850 break; 851 case FIP_DT_FKA: 852 if (dlen != sizeof(struct fip_fka_desc)) 853 goto len_err; 854 fka = (struct fip_fka_desc *)desc; 855 if (fka->fd_flags & FIP_FKA_ADV_D) 856 fcf->fd_flags = 1; 857 t = ntohl(fka->fd_fka_period); 858 if (t >= FCOE_CTLR_MIN_FKA) 859 fcf->fka_period = msecs_to_jiffies(t); 860 desc_mask &= ~BIT(FIP_DT_FKA); 861 break; 862 case FIP_DT_MAP_OUI: 863 case FIP_DT_FCOE_SIZE: 864 case FIP_DT_FLOGI: 865 case FIP_DT_FDISC: 866 case FIP_DT_LOGO: 867 case FIP_DT_ELP: 868 default: 869 LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x " 870 "in FIP adv\n", desc->fip_dtype); 871 /* standard says ignore unknown descriptors >= 128 */ 872 if (desc->fip_dtype < FIP_DT_VENDOR_BASE) 873 return -EINVAL; 874 break; 875 } 876 desc = (struct fip_desc *)((char *)desc + dlen); 877 rlen -= dlen; 878 } 879 if (!fcf->fc_map || (fcf->fc_map & 0x10000)) 880 return -EINVAL; 881 if (!fcf->switch_name) 882 return -EINVAL; 883 if (desc_mask) { 884 LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n", 885 desc_mask); 886 return -EINVAL; 887 } 888 return 0; 889 890 len_err: 891 LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n", 892 desc->fip_dtype, dlen); 893 return -EINVAL; 894 } 895 896 /** 897 * fcoe_ctlr_recv_adv() - Handle an incoming advertisement 898 * @fip: The FCoE controller receiving the advertisement 899 * @skb: The received FIP packet 900 */ 901 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb) 902 { 903 struct fcoe_fcf *fcf; 904 struct fcoe_fcf new; 905 struct fcoe_fcf *found; 906 unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV); 907 int first = 0; 908 int mtu_valid; 909 910 if (fcoe_ctlr_parse_adv(fip, skb, &new)) 911 return; 912 913 mutex_lock(&fip->ctlr_mutex); 914 first = list_empty(&fip->fcfs); 915 found = NULL; 916 list_for_each_entry(fcf, &fip->fcfs, list) { 917 if (fcf->switch_name == new.switch_name && 918 fcf->fabric_name == new.fabric_name && 919 fcf->fc_map == new.fc_map && 920 compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) { 921 found = fcf; 922 break; 923 } 924 } 925 if (!found) { 926 if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT) 927 goto out; 928 929 fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC); 930 if (!fcf) 931 goto out; 932 933 fip->fcf_count++; 934 memcpy(fcf, &new, sizeof(new)); 935 list_add(&fcf->list, &fip->fcfs); 936 } else { 937 /* 938 * Update the FCF's keep-alive descriptor flags. 939 * Other flag changes from new advertisements are 940 * ignored after a solicited advertisement is 941 * received and the FCF is selectable (usable). 942 */ 943 fcf->fd_flags = new.fd_flags; 944 if (!fcoe_ctlr_fcf_usable(fcf)) 945 fcf->flags = new.flags; 946 947 if (fcf == fip->sel_fcf && !fcf->fd_flags) { 948 fip->ctlr_ka_time -= fcf->fka_period; 949 fip->ctlr_ka_time += new.fka_period; 950 if (time_before(fip->ctlr_ka_time, fip->timer.expires)) 951 mod_timer(&fip->timer, fip->ctlr_ka_time); 952 } 953 fcf->fka_period = new.fka_period; 954 memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN); 955 } 956 mtu_valid = fcoe_ctlr_mtu_valid(fcf); 957 fcf->time = jiffies; 958 if (!found) 959 LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n", 960 fcf->fabric_name, fcf->fcf_mac); 961 962 /* 963 * If this advertisement is not solicited and our max receive size 964 * hasn't been verified, send a solicited advertisement. 965 */ 966 if (!mtu_valid) 967 fcoe_ctlr_solicit(fip, fcf); 968 969 /* 970 * If its been a while since we did a solicit, and this is 971 * the first advertisement we've received, do a multicast 972 * solicitation to gather as many advertisements as we can 973 * before selection occurs. 974 */ 975 if (first && time_after(jiffies, fip->sol_time + sol_tov)) 976 fcoe_ctlr_solicit(fip, NULL); 977 978 /* 979 * Put this FCF at the head of the list for priority among equals. 980 * This helps in the case of an NPV switch which insists we use 981 * the FCF that answers multicast solicitations, not the others that 982 * are sending periodic multicast advertisements. 983 */ 984 if (mtu_valid) 985 list_move(&fcf->list, &fip->fcfs); 986 987 /* 988 * If this is the first validated FCF, note the time and 989 * set a timer to trigger selection. 990 */ 991 if (mtu_valid && !fip->sel_fcf && fcoe_ctlr_fcf_usable(fcf)) { 992 fip->sel_time = jiffies + 993 msecs_to_jiffies(FCOE_CTLR_START_DELAY); 994 if (!timer_pending(&fip->timer) || 995 time_before(fip->sel_time, fip->timer.expires)) 996 mod_timer(&fip->timer, fip->sel_time); 997 } 998 out: 999 mutex_unlock(&fip->ctlr_mutex); 1000 } 1001 1002 /** 1003 * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame 1004 * @fip: The FCoE controller which received the packet 1005 * @skb: The received FIP packet 1006 */ 1007 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) 1008 { 1009 struct fc_lport *lport = fip->lp; 1010 struct fip_header *fiph; 1011 struct fc_frame *fp = (struct fc_frame *)skb; 1012 struct fc_frame_header *fh = NULL; 1013 struct fip_desc *desc; 1014 struct fip_encaps *els; 1015 struct fcoe_dev_stats *stats; 1016 enum fip_desc_type els_dtype = 0; 1017 u8 els_op; 1018 u8 sub; 1019 u8 granted_mac[ETH_ALEN] = { 0 }; 1020 size_t els_len = 0; 1021 size_t rlen; 1022 size_t dlen; 1023 u32 desc_mask = 0; 1024 u32 desc_cnt = 0; 1025 1026 fiph = (struct fip_header *)skb->data; 1027 sub = fiph->fip_subcode; 1028 if (sub != FIP_SC_REQ && sub != FIP_SC_REP) 1029 goto drop; 1030 1031 rlen = ntohs(fiph->fip_dl_len) * 4; 1032 if (rlen + sizeof(*fiph) > skb->len) 1033 goto drop; 1034 1035 desc = (struct fip_desc *)(fiph + 1); 1036 while (rlen > 0) { 1037 desc_cnt++; 1038 dlen = desc->fip_dlen * FIP_BPW; 1039 if (dlen < sizeof(*desc) || dlen > rlen) 1040 goto drop; 1041 /* Drop ELS if there are duplicate critical descriptors */ 1042 if (desc->fip_dtype < 32) { 1043 if (desc_mask & 1U << desc->fip_dtype) { 1044 LIBFCOE_FIP_DBG(fip, "Duplicate Critical " 1045 "Descriptors in FIP ELS\n"); 1046 goto drop; 1047 } 1048 desc_mask |= (1 << desc->fip_dtype); 1049 } 1050 switch (desc->fip_dtype) { 1051 case FIP_DT_MAC: 1052 if (desc_cnt == 1) { 1053 LIBFCOE_FIP_DBG(fip, "FIP descriptors " 1054 "received out of order\n"); 1055 goto drop; 1056 } 1057 1058 if (dlen != sizeof(struct fip_mac_desc)) 1059 goto len_err; 1060 memcpy(granted_mac, 1061 ((struct fip_mac_desc *)desc)->fd_mac, 1062 ETH_ALEN); 1063 break; 1064 case FIP_DT_FLOGI: 1065 case FIP_DT_FDISC: 1066 case FIP_DT_LOGO: 1067 case FIP_DT_ELP: 1068 if (desc_cnt != 1) { 1069 LIBFCOE_FIP_DBG(fip, "FIP descriptors " 1070 "received out of order\n"); 1071 goto drop; 1072 } 1073 if (fh) 1074 goto drop; 1075 if (dlen < sizeof(*els) + sizeof(*fh) + 1) 1076 goto len_err; 1077 els_len = dlen - sizeof(*els); 1078 els = (struct fip_encaps *)desc; 1079 fh = (struct fc_frame_header *)(els + 1); 1080 els_dtype = desc->fip_dtype; 1081 break; 1082 default: 1083 LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x " 1084 "in FIP adv\n", desc->fip_dtype); 1085 /* standard says ignore unknown descriptors >= 128 */ 1086 if (desc->fip_dtype < FIP_DT_VENDOR_BASE) 1087 goto drop; 1088 if (desc_cnt <= 2) { 1089 LIBFCOE_FIP_DBG(fip, "FIP descriptors " 1090 "received out of order\n"); 1091 goto drop; 1092 } 1093 break; 1094 } 1095 desc = (struct fip_desc *)((char *)desc + dlen); 1096 rlen -= dlen; 1097 } 1098 1099 if (!fh) 1100 goto drop; 1101 els_op = *(u8 *)(fh + 1); 1102 1103 if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) && 1104 sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) { 1105 if (els_op == ELS_LS_ACC) { 1106 if (!is_valid_ether_addr(granted_mac)) { 1107 LIBFCOE_FIP_DBG(fip, 1108 "Invalid MAC address %pM in FIP ELS\n", 1109 granted_mac); 1110 goto drop; 1111 } 1112 memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN); 1113 1114 if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) { 1115 fip->flogi_oxid = FC_XID_UNKNOWN; 1116 if (els_dtype == FIP_DT_FLOGI) 1117 fcoe_ctlr_announce(fip); 1118 } 1119 } else if (els_dtype == FIP_DT_FLOGI && 1120 !fcoe_ctlr_flogi_retry(fip)) 1121 goto drop; /* retrying FLOGI so drop reject */ 1122 } 1123 1124 if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) && 1125 (!(1U << FIP_DT_MAC & desc_mask)))) { 1126 LIBFCOE_FIP_DBG(fip, "Missing critical descriptors " 1127 "in FIP ELS\n"); 1128 goto drop; 1129 } 1130 1131 /* 1132 * Convert skb into an fc_frame containing only the ELS. 1133 */ 1134 skb_pull(skb, (u8 *)fh - skb->data); 1135 skb_trim(skb, els_len); 1136 fp = (struct fc_frame *)skb; 1137 fc_frame_init(fp); 1138 fr_sof(fp) = FC_SOF_I3; 1139 fr_eof(fp) = FC_EOF_T; 1140 fr_dev(fp) = lport; 1141 fr_encaps(fp) = els_dtype; 1142 1143 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 1144 stats->RxFrames++; 1145 stats->RxWords += skb->len / FIP_BPW; 1146 put_cpu(); 1147 1148 fc_exch_recv(lport, fp); 1149 return; 1150 1151 len_err: 1152 LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n", 1153 desc->fip_dtype, dlen); 1154 drop: 1155 kfree_skb(skb); 1156 } 1157 1158 /** 1159 * fcoe_ctlr_recv_els() - Handle an incoming link reset frame 1160 * @fip: The FCoE controller that received the frame 1161 * @fh: The received FIP header 1162 * 1163 * There may be multiple VN_Port descriptors. 1164 * The overall length has already been checked. 1165 */ 1166 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip, 1167 struct fip_header *fh) 1168 { 1169 struct fip_desc *desc; 1170 struct fip_mac_desc *mp; 1171 struct fip_wwn_desc *wp; 1172 struct fip_vn_desc *vp; 1173 size_t rlen; 1174 size_t dlen; 1175 struct fcoe_fcf *fcf = fip->sel_fcf; 1176 struct fc_lport *lport = fip->lp; 1177 struct fc_lport *vn_port = NULL; 1178 u32 desc_mask; 1179 int num_vlink_desc; 1180 int reset_phys_port = 0; 1181 struct fip_vn_desc **vlink_desc_arr = NULL; 1182 1183 LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n"); 1184 1185 if (!fcf || !lport->port_id) 1186 return; 1187 1188 /* 1189 * mask of required descriptors. Validating each one clears its bit. 1190 */ 1191 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME); 1192 1193 rlen = ntohs(fh->fip_dl_len) * FIP_BPW; 1194 desc = (struct fip_desc *)(fh + 1); 1195 1196 /* 1197 * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen' 1198 * before determining max Vx_Port descriptor but a buggy FCF could have 1199 * omited either or both MAC Address and Name Identifier descriptors 1200 */ 1201 num_vlink_desc = rlen / sizeof(*vp); 1202 if (num_vlink_desc) 1203 vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc, 1204 GFP_ATOMIC); 1205 if (!vlink_desc_arr) 1206 return; 1207 num_vlink_desc = 0; 1208 1209 while (rlen >= sizeof(*desc)) { 1210 dlen = desc->fip_dlen * FIP_BPW; 1211 if (dlen > rlen) 1212 goto err; 1213 /* Drop CVL if there are duplicate critical descriptors */ 1214 if ((desc->fip_dtype < 32) && 1215 (desc->fip_dtype != FIP_DT_VN_ID) && 1216 !(desc_mask & 1U << desc->fip_dtype)) { 1217 LIBFCOE_FIP_DBG(fip, "Duplicate Critical " 1218 "Descriptors in FIP CVL\n"); 1219 goto err; 1220 } 1221 switch (desc->fip_dtype) { 1222 case FIP_DT_MAC: 1223 mp = (struct fip_mac_desc *)desc; 1224 if (dlen < sizeof(*mp)) 1225 goto err; 1226 if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac)) 1227 goto err; 1228 desc_mask &= ~BIT(FIP_DT_MAC); 1229 break; 1230 case FIP_DT_NAME: 1231 wp = (struct fip_wwn_desc *)desc; 1232 if (dlen < sizeof(*wp)) 1233 goto err; 1234 if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name) 1235 goto err; 1236 desc_mask &= ~BIT(FIP_DT_NAME); 1237 break; 1238 case FIP_DT_VN_ID: 1239 vp = (struct fip_vn_desc *)desc; 1240 if (dlen < sizeof(*vp)) 1241 goto err; 1242 vlink_desc_arr[num_vlink_desc++] = vp; 1243 vn_port = fc_vport_id_lookup(lport, 1244 ntoh24(vp->fd_fc_id)); 1245 if (vn_port && (vn_port == lport)) { 1246 mutex_lock(&fip->ctlr_mutex); 1247 per_cpu_ptr(lport->dev_stats, 1248 get_cpu())->VLinkFailureCount++; 1249 put_cpu(); 1250 fcoe_ctlr_reset(fip); 1251 mutex_unlock(&fip->ctlr_mutex); 1252 } 1253 break; 1254 default: 1255 /* standard says ignore unknown descriptors >= 128 */ 1256 if (desc->fip_dtype < FIP_DT_VENDOR_BASE) 1257 goto err; 1258 break; 1259 } 1260 desc = (struct fip_desc *)((char *)desc + dlen); 1261 rlen -= dlen; 1262 } 1263 1264 /* 1265 * reset only if all required descriptors were present and valid. 1266 */ 1267 if (desc_mask) 1268 LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n", 1269 desc_mask); 1270 else if (!num_vlink_desc) { 1271 LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n"); 1272 /* 1273 * No Vx_Port description. Clear all NPIV ports, 1274 * followed by physical port 1275 */ 1276 mutex_lock(&lport->lp_mutex); 1277 list_for_each_entry(vn_port, &lport->vports, list) 1278 fc_lport_reset(vn_port); 1279 mutex_unlock(&lport->lp_mutex); 1280 1281 mutex_lock(&fip->ctlr_mutex); 1282 per_cpu_ptr(lport->dev_stats, 1283 get_cpu())->VLinkFailureCount++; 1284 put_cpu(); 1285 fcoe_ctlr_reset(fip); 1286 mutex_unlock(&fip->ctlr_mutex); 1287 1288 fc_lport_reset(fip->lp); 1289 fcoe_ctlr_solicit(fip, NULL); 1290 } else { 1291 int i; 1292 1293 LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n"); 1294 for (i = 0; i < num_vlink_desc; i++) { 1295 vp = vlink_desc_arr[i]; 1296 vn_port = fc_vport_id_lookup(lport, 1297 ntoh24(vp->fd_fc_id)); 1298 if (!vn_port) 1299 continue; 1300 1301 /* 1302 * 'port_id' is already validated, check MAC address and 1303 * wwpn 1304 */ 1305 if (compare_ether_addr(fip->get_src_addr(vn_port), 1306 vp->fd_mac) != 0 || 1307 get_unaligned_be64(&vp->fd_wwpn) != 1308 vn_port->wwpn) 1309 continue; 1310 1311 if (vn_port == lport) 1312 /* 1313 * Physical port, defer processing till all 1314 * listed NPIV ports are cleared 1315 */ 1316 reset_phys_port = 1; 1317 else /* NPIV port */ 1318 fc_lport_reset(vn_port); 1319 } 1320 1321 if (reset_phys_port) { 1322 fc_lport_reset(fip->lp); 1323 fcoe_ctlr_solicit(fip, NULL); 1324 } 1325 } 1326 1327 err: 1328 kfree(vlink_desc_arr); 1329 } 1330 1331 /** 1332 * fcoe_ctlr_recv() - Receive a FIP packet 1333 * @fip: The FCoE controller that received the packet 1334 * @skb: The received FIP packet 1335 * 1336 * This may be called from either NET_RX_SOFTIRQ or IRQ. 1337 */ 1338 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb) 1339 { 1340 skb_queue_tail(&fip->fip_recv_list, skb); 1341 schedule_work(&fip->recv_work); 1342 } 1343 EXPORT_SYMBOL(fcoe_ctlr_recv); 1344 1345 /** 1346 * fcoe_ctlr_recv_handler() - Receive a FIP frame 1347 * @fip: The FCoE controller that received the frame 1348 * @skb: The received FIP frame 1349 * 1350 * Returns non-zero if the frame is dropped. 1351 */ 1352 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb) 1353 { 1354 struct fip_header *fiph; 1355 struct ethhdr *eh; 1356 enum fip_state state; 1357 u16 op; 1358 u8 sub; 1359 1360 if (skb_linearize(skb)) 1361 goto drop; 1362 if (skb->len < sizeof(*fiph)) 1363 goto drop; 1364 eh = eth_hdr(skb); 1365 if (fip->mode == FIP_MODE_VN2VN) { 1366 if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) && 1367 compare_ether_addr(eh->h_dest, fcoe_all_vn2vn) && 1368 compare_ether_addr(eh->h_dest, fcoe_all_p2p)) 1369 goto drop; 1370 } else if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) && 1371 compare_ether_addr(eh->h_dest, fcoe_all_enode)) 1372 goto drop; 1373 fiph = (struct fip_header *)skb->data; 1374 op = ntohs(fiph->fip_op); 1375 sub = fiph->fip_subcode; 1376 1377 if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER) 1378 goto drop; 1379 if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len) 1380 goto drop; 1381 1382 mutex_lock(&fip->ctlr_mutex); 1383 state = fip->state; 1384 if (state == FIP_ST_AUTO) { 1385 fip->map_dest = 0; 1386 fcoe_ctlr_set_state(fip, FIP_ST_ENABLED); 1387 state = FIP_ST_ENABLED; 1388 LIBFCOE_FIP_DBG(fip, "Using FIP mode\n"); 1389 } 1390 mutex_unlock(&fip->ctlr_mutex); 1391 1392 if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN) 1393 return fcoe_ctlr_vn_recv(fip, skb); 1394 1395 if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP && 1396 state != FIP_ST_VNMP_CLAIM) 1397 goto drop; 1398 1399 if (op == FIP_OP_LS) { 1400 fcoe_ctlr_recv_els(fip, skb); /* consumes skb */ 1401 return 0; 1402 } 1403 1404 if (state != FIP_ST_ENABLED) 1405 goto drop; 1406 1407 if (op == FIP_OP_DISC && sub == FIP_SC_ADV) 1408 fcoe_ctlr_recv_adv(fip, skb); 1409 else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) 1410 fcoe_ctlr_recv_clr_vlink(fip, fiph); 1411 kfree_skb(skb); 1412 return 0; 1413 drop: 1414 kfree_skb(skb); 1415 return -1; 1416 } 1417 1418 /** 1419 * fcoe_ctlr_select() - Select the best FCF (if possible) 1420 * @fip: The FCoE controller 1421 * 1422 * Returns the selected FCF, or NULL if none are usable. 1423 * 1424 * If there are conflicting advertisements, no FCF can be chosen. 1425 * 1426 * If there is already a selected FCF, this will choose a better one or 1427 * an equivalent one that hasn't already been sent a FLOGI. 1428 * 1429 * Called with lock held. 1430 */ 1431 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip) 1432 { 1433 struct fcoe_fcf *fcf; 1434 struct fcoe_fcf *best = fip->sel_fcf; 1435 struct fcoe_fcf *first; 1436 1437 first = list_first_entry(&fip->fcfs, struct fcoe_fcf, list); 1438 1439 list_for_each_entry(fcf, &fip->fcfs, list) { 1440 LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx " 1441 "VFID %d mac %pM map %x val %d " 1442 "sent %u pri %u\n", 1443 fcf->fabric_name, fcf->vfid, fcf->fcf_mac, 1444 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf), 1445 fcf->flogi_sent, fcf->pri); 1446 if (fcf->fabric_name != first->fabric_name || 1447 fcf->vfid != first->vfid || 1448 fcf->fc_map != first->fc_map) { 1449 LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, " 1450 "or FC-MAP\n"); 1451 return NULL; 1452 } 1453 if (fcf->flogi_sent) 1454 continue; 1455 if (!fcoe_ctlr_fcf_usable(fcf)) { 1456 LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx " 1457 "map %x %svalid %savailable\n", 1458 fcf->fabric_name, fcf->fc_map, 1459 (fcf->flags & FIP_FL_SOL) ? "" : "in", 1460 (fcf->flags & FIP_FL_AVAIL) ? 1461 "" : "un"); 1462 continue; 1463 } 1464 if (!best || fcf->pri < best->pri || best->flogi_sent) 1465 best = fcf; 1466 } 1467 fip->sel_fcf = best; 1468 if (best) { 1469 LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac); 1470 fip->port_ka_time = jiffies + 1471 msecs_to_jiffies(FIP_VN_KA_PERIOD); 1472 fip->ctlr_ka_time = jiffies + best->fka_period; 1473 if (time_before(fip->ctlr_ka_time, fip->timer.expires)) 1474 mod_timer(&fip->timer, fip->ctlr_ka_time); 1475 } 1476 return best; 1477 } 1478 1479 /** 1480 * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF 1481 * @fip: The FCoE controller 1482 * 1483 * Returns non-zero error if it could not be sent. 1484 * 1485 * Called with ctlr_mutex and ctlr_lock held. 1486 * Caller must verify that fip->sel_fcf is not NULL. 1487 */ 1488 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip) 1489 { 1490 struct sk_buff *skb; 1491 struct sk_buff *skb_orig; 1492 struct fc_frame_header *fh; 1493 int error; 1494 1495 skb_orig = fip->flogi_req; 1496 if (!skb_orig) 1497 return -EINVAL; 1498 1499 /* 1500 * Clone and send the FLOGI request. If clone fails, use original. 1501 */ 1502 skb = skb_clone(skb_orig, GFP_ATOMIC); 1503 if (!skb) { 1504 skb = skb_orig; 1505 fip->flogi_req = NULL; 1506 } 1507 fh = (struct fc_frame_header *)skb->data; 1508 error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb, 1509 ntoh24(fh->fh_d_id)); 1510 if (error) { 1511 kfree_skb(skb); 1512 return error; 1513 } 1514 fip->send(fip, skb); 1515 fip->sel_fcf->flogi_sent = 1; 1516 return 0; 1517 } 1518 1519 /** 1520 * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible 1521 * @fip: The FCoE controller 1522 * 1523 * Returns non-zero error code if there's no FLOGI request to retry or 1524 * no alternate FCF available. 1525 */ 1526 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip) 1527 { 1528 struct fcoe_fcf *fcf; 1529 int error; 1530 1531 mutex_lock(&fip->ctlr_mutex); 1532 spin_lock_bh(&fip->ctlr_lock); 1533 LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n"); 1534 fcf = fcoe_ctlr_select(fip); 1535 if (!fcf || fcf->flogi_sent) { 1536 kfree_skb(fip->flogi_req); 1537 fip->flogi_req = NULL; 1538 error = -ENOENT; 1539 } else { 1540 fcoe_ctlr_solicit(fip, NULL); 1541 error = fcoe_ctlr_flogi_send_locked(fip); 1542 } 1543 spin_unlock_bh(&fip->ctlr_lock); 1544 mutex_unlock(&fip->ctlr_mutex); 1545 return error; 1546 } 1547 1548 1549 /** 1550 * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI. 1551 * @fip: The FCoE controller that timed out 1552 * 1553 * Done here because fcoe_ctlr_els_send() can't get mutex. 1554 * 1555 * Called with ctlr_mutex held. The caller must not hold ctlr_lock. 1556 */ 1557 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip) 1558 { 1559 struct fcoe_fcf *fcf; 1560 1561 spin_lock_bh(&fip->ctlr_lock); 1562 fcf = fip->sel_fcf; 1563 if (!fcf || !fip->flogi_req_send) 1564 goto unlock; 1565 1566 LIBFCOE_FIP_DBG(fip, "sending FLOGI\n"); 1567 1568 /* 1569 * If this FLOGI is being sent due to a timeout retry 1570 * to the same FCF as before, select a different FCF if possible. 1571 */ 1572 if (fcf->flogi_sent) { 1573 LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n"); 1574 fcf = fcoe_ctlr_select(fip); 1575 if (!fcf || fcf->flogi_sent) { 1576 LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n"); 1577 list_for_each_entry(fcf, &fip->fcfs, list) 1578 fcf->flogi_sent = 0; 1579 fcf = fcoe_ctlr_select(fip); 1580 } 1581 } 1582 if (fcf) { 1583 fcoe_ctlr_flogi_send_locked(fip); 1584 fip->flogi_req_send = 0; 1585 } else /* XXX */ 1586 LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n"); 1587 unlock: 1588 spin_unlock_bh(&fip->ctlr_lock); 1589 } 1590 1591 /** 1592 * fcoe_ctlr_timeout() - FIP timeout handler 1593 * @arg: The FCoE controller that timed out 1594 */ 1595 static void fcoe_ctlr_timeout(unsigned long arg) 1596 { 1597 struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg; 1598 1599 schedule_work(&fip->timer_work); 1600 } 1601 1602 /** 1603 * fcoe_ctlr_timer_work() - Worker thread function for timer work 1604 * @work: Handle to a FCoE controller 1605 * 1606 * Ages FCFs. Triggers FCF selection if possible. 1607 * Sends keep-alives and resets. 1608 */ 1609 static void fcoe_ctlr_timer_work(struct work_struct *work) 1610 { 1611 struct fcoe_ctlr *fip; 1612 struct fc_lport *vport; 1613 u8 *mac; 1614 u8 reset = 0; 1615 u8 send_ctlr_ka = 0; 1616 u8 send_port_ka = 0; 1617 struct fcoe_fcf *sel; 1618 struct fcoe_fcf *fcf; 1619 unsigned long next_timer; 1620 1621 fip = container_of(work, struct fcoe_ctlr, timer_work); 1622 if (fip->mode == FIP_MODE_VN2VN) 1623 return fcoe_ctlr_vn_timeout(fip); 1624 mutex_lock(&fip->ctlr_mutex); 1625 if (fip->state == FIP_ST_DISABLED) { 1626 mutex_unlock(&fip->ctlr_mutex); 1627 return; 1628 } 1629 1630 fcf = fip->sel_fcf; 1631 next_timer = fcoe_ctlr_age_fcfs(fip); 1632 1633 sel = fip->sel_fcf; 1634 if (!sel && fip->sel_time) { 1635 if (time_after_eq(jiffies, fip->sel_time)) { 1636 sel = fcoe_ctlr_select(fip); 1637 fip->sel_time = 0; 1638 } else if (time_after(next_timer, fip->sel_time)) 1639 next_timer = fip->sel_time; 1640 } 1641 1642 if (sel && fip->flogi_req_send) 1643 fcoe_ctlr_flogi_send(fip); 1644 else if (!sel && fcf) 1645 reset = 1; 1646 1647 if (sel && !sel->fd_flags) { 1648 if (time_after_eq(jiffies, fip->ctlr_ka_time)) { 1649 fip->ctlr_ka_time = jiffies + sel->fka_period; 1650 send_ctlr_ka = 1; 1651 } 1652 if (time_after(next_timer, fip->ctlr_ka_time)) 1653 next_timer = fip->ctlr_ka_time; 1654 1655 if (time_after_eq(jiffies, fip->port_ka_time)) { 1656 fip->port_ka_time = jiffies + 1657 msecs_to_jiffies(FIP_VN_KA_PERIOD); 1658 send_port_ka = 1; 1659 } 1660 if (time_after(next_timer, fip->port_ka_time)) 1661 next_timer = fip->port_ka_time; 1662 } 1663 if (!list_empty(&fip->fcfs)) 1664 mod_timer(&fip->timer, next_timer); 1665 mutex_unlock(&fip->ctlr_mutex); 1666 1667 if (reset) { 1668 fc_lport_reset(fip->lp); 1669 /* restart things with a solicitation */ 1670 fcoe_ctlr_solicit(fip, NULL); 1671 } 1672 1673 if (send_ctlr_ka) 1674 fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr); 1675 1676 if (send_port_ka) { 1677 mutex_lock(&fip->lp->lp_mutex); 1678 mac = fip->get_src_addr(fip->lp); 1679 fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac); 1680 list_for_each_entry(vport, &fip->lp->vports, list) { 1681 mac = fip->get_src_addr(vport); 1682 fcoe_ctlr_send_keep_alive(fip, vport, 1, mac); 1683 } 1684 mutex_unlock(&fip->lp->lp_mutex); 1685 } 1686 } 1687 1688 /** 1689 * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames 1690 * @recv_work: Handle to a FCoE controller 1691 */ 1692 static void fcoe_ctlr_recv_work(struct work_struct *recv_work) 1693 { 1694 struct fcoe_ctlr *fip; 1695 struct sk_buff *skb; 1696 1697 fip = container_of(recv_work, struct fcoe_ctlr, recv_work); 1698 while ((skb = skb_dequeue(&fip->fip_recv_list))) 1699 fcoe_ctlr_recv_handler(fip, skb); 1700 } 1701 1702 /** 1703 * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response 1704 * @fip: The FCoE controller 1705 * @fp: The FC frame to snoop 1706 * 1707 * Snoop potential response to FLOGI or even incoming FLOGI. 1708 * 1709 * The caller has checked that we are waiting for login as indicated 1710 * by fip->flogi_oxid != FC_XID_UNKNOWN. 1711 * 1712 * The caller is responsible for freeing the frame. 1713 * Fill in the granted_mac address. 1714 * 1715 * Return non-zero if the frame should not be delivered to libfc. 1716 */ 1717 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport, 1718 struct fc_frame *fp) 1719 { 1720 struct fc_frame_header *fh; 1721 u8 op; 1722 u8 *sa; 1723 1724 sa = eth_hdr(&fp->skb)->h_source; 1725 fh = fc_frame_header_get(fp); 1726 if (fh->fh_type != FC_TYPE_ELS) 1727 return 0; 1728 1729 op = fc_frame_payload_op(fp); 1730 if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP && 1731 fip->flogi_oxid == ntohs(fh->fh_ox_id)) { 1732 1733 mutex_lock(&fip->ctlr_mutex); 1734 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) { 1735 mutex_unlock(&fip->ctlr_mutex); 1736 return -EINVAL; 1737 } 1738 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP); 1739 LIBFCOE_FIP_DBG(fip, 1740 "received FLOGI LS_ACC using non-FIP mode\n"); 1741 1742 /* 1743 * FLOGI accepted. 1744 * If the src mac addr is FC_OUI-based, then we mark the 1745 * address_mode flag to use FC_OUI-based Ethernet DA. 1746 * Otherwise we use the FCoE gateway addr 1747 */ 1748 if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) { 1749 fcoe_ctlr_map_dest(fip); 1750 } else { 1751 memcpy(fip->dest_addr, sa, ETH_ALEN); 1752 fip->map_dest = 0; 1753 } 1754 fip->flogi_oxid = FC_XID_UNKNOWN; 1755 mutex_unlock(&fip->ctlr_mutex); 1756 fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id); 1757 } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) { 1758 /* 1759 * Save source MAC for point-to-point responses. 1760 */ 1761 mutex_lock(&fip->ctlr_mutex); 1762 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) { 1763 memcpy(fip->dest_addr, sa, ETH_ALEN); 1764 fip->map_dest = 0; 1765 if (fip->state == FIP_ST_AUTO) 1766 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. " 1767 "Setting non-FIP mode\n"); 1768 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP); 1769 } 1770 mutex_unlock(&fip->ctlr_mutex); 1771 } 1772 return 0; 1773 } 1774 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi); 1775 1776 /** 1777 * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN 1778 * @mac: The MAC address to convert 1779 * @scheme: The scheme to use when converting 1780 * @port: The port indicator for converting 1781 * 1782 * Returns: u64 fc world wide name 1783 */ 1784 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN], 1785 unsigned int scheme, unsigned int port) 1786 { 1787 u64 wwn; 1788 u64 host_mac; 1789 1790 /* The MAC is in NO, so flip only the low 48 bits */ 1791 host_mac = ((u64) mac[0] << 40) | 1792 ((u64) mac[1] << 32) | 1793 ((u64) mac[2] << 24) | 1794 ((u64) mac[3] << 16) | 1795 ((u64) mac[4] << 8) | 1796 (u64) mac[5]; 1797 1798 WARN_ON(host_mac >= (1ULL << 48)); 1799 wwn = host_mac | ((u64) scheme << 60); 1800 switch (scheme) { 1801 case 1: 1802 WARN_ON(port != 0); 1803 break; 1804 case 2: 1805 WARN_ON(port >= 0xfff); 1806 wwn |= (u64) port << 48; 1807 break; 1808 default: 1809 WARN_ON(1); 1810 break; 1811 } 1812 1813 return wwn; 1814 } 1815 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac); 1816 1817 /** 1818 * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv 1819 * @rdata: libfc remote port 1820 */ 1821 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata) 1822 { 1823 return (struct fcoe_rport *)(rdata + 1); 1824 } 1825 1826 /** 1827 * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply. 1828 * @fip: The FCoE controller 1829 * @sub: sub-opcode for probe request, reply, or advertisement. 1830 * @dest: The destination Ethernet MAC address 1831 * @min_len: minimum size of the Ethernet payload to be sent 1832 */ 1833 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip, 1834 enum fip_vn2vn_subcode sub, 1835 const u8 *dest, size_t min_len) 1836 { 1837 struct sk_buff *skb; 1838 struct fip_frame { 1839 struct ethhdr eth; 1840 struct fip_header fip; 1841 struct fip_mac_desc mac; 1842 struct fip_wwn_desc wwnn; 1843 struct fip_vn_desc vn; 1844 } __packed * frame; 1845 struct fip_fc4_feat *ff; 1846 struct fip_size_desc *size; 1847 u32 fcp_feat; 1848 size_t len; 1849 size_t dlen; 1850 1851 len = sizeof(*frame); 1852 dlen = 0; 1853 if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) { 1854 dlen = sizeof(struct fip_fc4_feat) + 1855 sizeof(struct fip_size_desc); 1856 len += dlen; 1857 } 1858 dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn); 1859 len = max(len, min_len + sizeof(struct ethhdr)); 1860 1861 skb = dev_alloc_skb(len); 1862 if (!skb) 1863 return; 1864 1865 frame = (struct fip_frame *)skb->data; 1866 memset(frame, 0, len); 1867 memcpy(frame->eth.h_dest, dest, ETH_ALEN); 1868 memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN); 1869 frame->eth.h_proto = htons(ETH_P_FIP); 1870 1871 frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); 1872 frame->fip.fip_op = htons(FIP_OP_VN2VN); 1873 frame->fip.fip_subcode = sub; 1874 frame->fip.fip_dl_len = htons(dlen / FIP_BPW); 1875 1876 frame->mac.fd_desc.fip_dtype = FIP_DT_MAC; 1877 frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW; 1878 memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); 1879 1880 frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME; 1881 frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW; 1882 put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn); 1883 1884 frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID; 1885 frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW; 1886 hton24(frame->vn.fd_mac, FIP_VN_FC_MAP); 1887 hton24(frame->vn.fd_mac + 3, fip->port_id); 1888 hton24(frame->vn.fd_fc_id, fip->port_id); 1889 put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn); 1890 1891 /* 1892 * For claims, add FC-4 features. 1893 * TBD: Add interface to get fc-4 types and features from libfc. 1894 */ 1895 if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) { 1896 ff = (struct fip_fc4_feat *)(frame + 1); 1897 ff->fd_desc.fip_dtype = FIP_DT_FC4F; 1898 ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW; 1899 ff->fd_fts = fip->lp->fcts; 1900 1901 fcp_feat = 0; 1902 if (fip->lp->service_params & FCP_SPPF_INIT_FCN) 1903 fcp_feat |= FCP_FEAT_INIT; 1904 if (fip->lp->service_params & FCP_SPPF_TARG_FCN) 1905 fcp_feat |= FCP_FEAT_TARG; 1906 fcp_feat <<= (FC_TYPE_FCP * 4) % 32; 1907 ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat); 1908 1909 size = (struct fip_size_desc *)(ff + 1); 1910 size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE; 1911 size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW; 1912 size->fd_size = htons(fcoe_ctlr_fcoe_size(fip)); 1913 } 1914 1915 skb_put(skb, len); 1916 skb->protocol = htons(ETH_P_FIP); 1917 skb->priority = fip->priority; 1918 skb_reset_mac_header(skb); 1919 skb_reset_network_header(skb); 1920 1921 fip->send(fip, skb); 1922 } 1923 1924 /** 1925 * fcoe_ctlr_vn_rport_callback - Event handler for rport events. 1926 * @lport: The lport which is receiving the event 1927 * @rdata: remote port private data 1928 * @event: The event that occurred 1929 * 1930 * Locking Note: The rport lock must not be held when calling this function. 1931 */ 1932 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport, 1933 struct fc_rport_priv *rdata, 1934 enum fc_rport_event event) 1935 { 1936 struct fcoe_ctlr *fip = lport->disc.priv; 1937 struct fcoe_rport *frport = fcoe_ctlr_rport(rdata); 1938 1939 LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n", 1940 rdata->ids.port_id, event); 1941 1942 mutex_lock(&fip->ctlr_mutex); 1943 switch (event) { 1944 case RPORT_EV_READY: 1945 frport->login_count = 0; 1946 break; 1947 case RPORT_EV_LOGO: 1948 case RPORT_EV_FAILED: 1949 case RPORT_EV_STOP: 1950 frport->login_count++; 1951 if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) { 1952 LIBFCOE_FIP_DBG(fip, 1953 "rport FLOGI limited port_id %6.6x\n", 1954 rdata->ids.port_id); 1955 lport->tt.rport_logoff(rdata); 1956 } 1957 break; 1958 default: 1959 break; 1960 } 1961 mutex_unlock(&fip->ctlr_mutex); 1962 } 1963 1964 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = { 1965 .event_callback = fcoe_ctlr_vn_rport_callback, 1966 }; 1967 1968 /** 1969 * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode 1970 * @fip: The FCoE controller 1971 * 1972 * Called with ctlr_mutex held. 1973 */ 1974 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport) 1975 { 1976 mutex_lock(&lport->disc.disc_mutex); 1977 lport->disc.disc_callback = NULL; 1978 mutex_unlock(&lport->disc.disc_mutex); 1979 } 1980 1981 /** 1982 * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode 1983 * @fip: The FCoE controller 1984 * 1985 * Called through the local port template for discovery. 1986 * Called without the ctlr_mutex held. 1987 */ 1988 static void fcoe_ctlr_disc_stop(struct fc_lport *lport) 1989 { 1990 struct fcoe_ctlr *fip = lport->disc.priv; 1991 1992 mutex_lock(&fip->ctlr_mutex); 1993 fcoe_ctlr_disc_stop_locked(lport); 1994 mutex_unlock(&fip->ctlr_mutex); 1995 } 1996 1997 /** 1998 * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode 1999 * @fip: The FCoE controller 2000 * 2001 * Called through the local port template for discovery. 2002 * Called without the ctlr_mutex held. 2003 */ 2004 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport) 2005 { 2006 fcoe_ctlr_disc_stop(lport); 2007 lport->tt.rport_flush_queue(); 2008 synchronize_rcu(); 2009 } 2010 2011 /** 2012 * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id 2013 * @fip: The FCoE controller 2014 * 2015 * Called with fcoe_ctlr lock held. 2016 */ 2017 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip) 2018 { 2019 unsigned long wait; 2020 u32 port_id; 2021 2022 fcoe_ctlr_disc_stop_locked(fip->lp); 2023 2024 /* 2025 * Get proposed port ID. 2026 * If this is the first try after link up, use any previous port_id. 2027 * If there was none, use the low bits of the port_name. 2028 * On subsequent tries, get the next random one. 2029 * Don't use reserved IDs, use another non-zero value, just as random. 2030 */ 2031 port_id = fip->port_id; 2032 if (fip->probe_tries) 2033 port_id = prandom32(&fip->rnd_state) & 0xffff; 2034 else if (!port_id) 2035 port_id = fip->lp->wwpn & 0xffff; 2036 if (!port_id || port_id == 0xffff) 2037 port_id = 1; 2038 fip->port_id = port_id; 2039 2040 if (fip->probe_tries < FIP_VN_RLIM_COUNT) { 2041 fip->probe_tries++; 2042 wait = random32() % FIP_VN_PROBE_WAIT; 2043 } else 2044 wait = FIP_VN_RLIM_INT; 2045 mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait)); 2046 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START); 2047 } 2048 2049 /** 2050 * fcoe_ctlr_vn_start() - Start in VN2VN mode 2051 * @fip: The FCoE controller 2052 * 2053 * Called with fcoe_ctlr lock held. 2054 */ 2055 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip) 2056 { 2057 fip->probe_tries = 0; 2058 prandom32_seed(&fip->rnd_state, fip->lp->wwpn); 2059 fcoe_ctlr_vn_restart(fip); 2060 } 2061 2062 /** 2063 * fcoe_ctlr_vn_parse - parse probe request or response 2064 * @fip: The FCoE controller 2065 * @skb: incoming packet 2066 * @rdata: buffer for resulting parsed VN entry plus fcoe_rport 2067 * 2068 * Returns non-zero error number on error. 2069 * Does not consume the packet. 2070 */ 2071 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip, 2072 struct sk_buff *skb, 2073 struct fc_rport_priv *rdata) 2074 { 2075 struct fip_header *fiph; 2076 struct fip_desc *desc = NULL; 2077 struct fip_mac_desc *macd = NULL; 2078 struct fip_wwn_desc *wwn = NULL; 2079 struct fip_vn_desc *vn = NULL; 2080 struct fip_size_desc *size = NULL; 2081 struct fcoe_rport *frport; 2082 size_t rlen; 2083 size_t dlen; 2084 u32 desc_mask = 0; 2085 u32 dtype; 2086 u8 sub; 2087 2088 memset(rdata, 0, sizeof(*rdata) + sizeof(*frport)); 2089 frport = fcoe_ctlr_rport(rdata); 2090 2091 fiph = (struct fip_header *)skb->data; 2092 frport->flags = ntohs(fiph->fip_flags); 2093 2094 sub = fiph->fip_subcode; 2095 switch (sub) { 2096 case FIP_SC_VN_PROBE_REQ: 2097 case FIP_SC_VN_PROBE_REP: 2098 case FIP_SC_VN_BEACON: 2099 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | 2100 BIT(FIP_DT_VN_ID); 2101 break; 2102 case FIP_SC_VN_CLAIM_NOTIFY: 2103 case FIP_SC_VN_CLAIM_REP: 2104 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | 2105 BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) | 2106 BIT(FIP_DT_FCOE_SIZE); 2107 break; 2108 default: 2109 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub); 2110 return -EINVAL; 2111 } 2112 2113 rlen = ntohs(fiph->fip_dl_len) * 4; 2114 if (rlen + sizeof(*fiph) > skb->len) 2115 return -EINVAL; 2116 2117 desc = (struct fip_desc *)(fiph + 1); 2118 while (rlen > 0) { 2119 dlen = desc->fip_dlen * FIP_BPW; 2120 if (dlen < sizeof(*desc) || dlen > rlen) 2121 return -EINVAL; 2122 2123 dtype = desc->fip_dtype; 2124 if (dtype < 32) { 2125 if (!(desc_mask & BIT(dtype))) { 2126 LIBFCOE_FIP_DBG(fip, 2127 "unexpected or duplicated desc " 2128 "desc type %u in " 2129 "FIP VN2VN subtype %u\n", 2130 dtype, sub); 2131 return -EINVAL; 2132 } 2133 desc_mask &= ~BIT(dtype); 2134 } 2135 2136 switch (dtype) { 2137 case FIP_DT_MAC: 2138 if (dlen != sizeof(struct fip_mac_desc)) 2139 goto len_err; 2140 macd = (struct fip_mac_desc *)desc; 2141 if (!is_valid_ether_addr(macd->fd_mac)) { 2142 LIBFCOE_FIP_DBG(fip, 2143 "Invalid MAC addr %pM in FIP VN2VN\n", 2144 macd->fd_mac); 2145 return -EINVAL; 2146 } 2147 memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN); 2148 break; 2149 case FIP_DT_NAME: 2150 if (dlen != sizeof(struct fip_wwn_desc)) 2151 goto len_err; 2152 wwn = (struct fip_wwn_desc *)desc; 2153 rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn); 2154 break; 2155 case FIP_DT_VN_ID: 2156 if (dlen != sizeof(struct fip_vn_desc)) 2157 goto len_err; 2158 vn = (struct fip_vn_desc *)desc; 2159 memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN); 2160 rdata->ids.port_id = ntoh24(vn->fd_fc_id); 2161 rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn); 2162 break; 2163 case FIP_DT_FC4F: 2164 if (dlen != sizeof(struct fip_fc4_feat)) 2165 goto len_err; 2166 break; 2167 case FIP_DT_FCOE_SIZE: 2168 if (dlen != sizeof(struct fip_size_desc)) 2169 goto len_err; 2170 size = (struct fip_size_desc *)desc; 2171 frport->fcoe_len = ntohs(size->fd_size); 2172 break; 2173 default: 2174 LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x " 2175 "in FIP probe\n", dtype); 2176 /* standard says ignore unknown descriptors >= 128 */ 2177 if (dtype < FIP_DT_VENDOR_BASE) 2178 return -EINVAL; 2179 break; 2180 } 2181 desc = (struct fip_desc *)((char *)desc + dlen); 2182 rlen -= dlen; 2183 } 2184 return 0; 2185 2186 len_err: 2187 LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n", 2188 dtype, dlen); 2189 return -EINVAL; 2190 } 2191 2192 /** 2193 * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification. 2194 * @fip: The FCoE controller 2195 * 2196 * Called with ctlr_mutex held. 2197 */ 2198 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip) 2199 { 2200 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0); 2201 fip->sol_time = jiffies; 2202 } 2203 2204 /** 2205 * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request. 2206 * @fip: The FCoE controller 2207 * @rdata: parsed remote port with frport from the probe request 2208 * 2209 * Called with ctlr_mutex held. 2210 */ 2211 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip, 2212 struct fc_rport_priv *rdata) 2213 { 2214 struct fcoe_rport *frport = fcoe_ctlr_rport(rdata); 2215 2216 if (rdata->ids.port_id != fip->port_id) 2217 return; 2218 2219 switch (fip->state) { 2220 case FIP_ST_VNMP_CLAIM: 2221 case FIP_ST_VNMP_UP: 2222 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP, 2223 frport->enode_mac, 0); 2224 break; 2225 case FIP_ST_VNMP_PROBE1: 2226 case FIP_ST_VNMP_PROBE2: 2227 /* 2228 * Decide whether to reply to the Probe. 2229 * Our selected address is never a "recorded" one, so 2230 * only reply if our WWPN is greater and the 2231 * Probe's REC bit is not set. 2232 * If we don't reply, we will change our address. 2233 */ 2234 if (fip->lp->wwpn > rdata->ids.port_name && 2235 !(frport->flags & FIP_FL_REC_OR_P2P)) { 2236 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP, 2237 frport->enode_mac, 0); 2238 break; 2239 } 2240 /* fall through */ 2241 case FIP_ST_VNMP_START: 2242 fcoe_ctlr_vn_restart(fip); 2243 break; 2244 default: 2245 break; 2246 } 2247 } 2248 2249 /** 2250 * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply. 2251 * @fip: The FCoE controller 2252 * @rdata: parsed remote port with frport from the probe request 2253 * 2254 * Called with ctlr_mutex held. 2255 */ 2256 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip, 2257 struct fc_rport_priv *rdata) 2258 { 2259 if (rdata->ids.port_id != fip->port_id) 2260 return; 2261 switch (fip->state) { 2262 case FIP_ST_VNMP_START: 2263 case FIP_ST_VNMP_PROBE1: 2264 case FIP_ST_VNMP_PROBE2: 2265 case FIP_ST_VNMP_CLAIM: 2266 fcoe_ctlr_vn_restart(fip); 2267 break; 2268 case FIP_ST_VNMP_UP: 2269 fcoe_ctlr_vn_send_claim(fip); 2270 break; 2271 default: 2272 break; 2273 } 2274 } 2275 2276 /** 2277 * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply. 2278 * @fip: The FCoE controller 2279 * @new: newly-parsed remote port with frport as a template for new rdata 2280 * 2281 * Called with ctlr_mutex held. 2282 */ 2283 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new) 2284 { 2285 struct fc_lport *lport = fip->lp; 2286 struct fc_rport_priv *rdata; 2287 struct fc_rport_identifiers *ids; 2288 struct fcoe_rport *frport; 2289 u32 port_id; 2290 2291 port_id = new->ids.port_id; 2292 if (port_id == fip->port_id) 2293 return; 2294 2295 mutex_lock(&lport->disc.disc_mutex); 2296 rdata = lport->tt.rport_create(lport, port_id); 2297 if (!rdata) { 2298 mutex_unlock(&lport->disc.disc_mutex); 2299 return; 2300 } 2301 2302 rdata->ops = &fcoe_ctlr_vn_rport_ops; 2303 rdata->disc_id = lport->disc.disc_id; 2304 2305 ids = &rdata->ids; 2306 if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) || 2307 (ids->node_name != -1 && ids->node_name != new->ids.node_name)) 2308 lport->tt.rport_logoff(rdata); 2309 ids->port_name = new->ids.port_name; 2310 ids->node_name = new->ids.node_name; 2311 mutex_unlock(&lport->disc.disc_mutex); 2312 2313 frport = fcoe_ctlr_rport(rdata); 2314 LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s\n", 2315 port_id, frport->fcoe_len ? "old" : "new"); 2316 *frport = *fcoe_ctlr_rport(new); 2317 frport->time = 0; 2318 } 2319 2320 /** 2321 * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address 2322 * @fip: The FCoE controller 2323 * @port_id: The port_id of the remote VN_node 2324 * @mac: buffer which will hold the VN_NODE destination MAC address, if found. 2325 * 2326 * Returns non-zero error if no remote port found. 2327 */ 2328 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac) 2329 { 2330 struct fc_lport *lport = fip->lp; 2331 struct fc_rport_priv *rdata; 2332 struct fcoe_rport *frport; 2333 int ret = -1; 2334 2335 rcu_read_lock(); 2336 rdata = lport->tt.rport_lookup(lport, port_id); 2337 if (rdata) { 2338 frport = fcoe_ctlr_rport(rdata); 2339 memcpy(mac, frport->enode_mac, ETH_ALEN); 2340 ret = 0; 2341 } 2342 rcu_read_unlock(); 2343 return ret; 2344 } 2345 2346 /** 2347 * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification 2348 * @fip: The FCoE controller 2349 * @new: newly-parsed remote port with frport as a template for new rdata 2350 * 2351 * Called with ctlr_mutex held. 2352 */ 2353 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip, 2354 struct fc_rport_priv *new) 2355 { 2356 struct fcoe_rport *frport = fcoe_ctlr_rport(new); 2357 2358 if (frport->flags & FIP_FL_REC_OR_P2P) { 2359 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0); 2360 return; 2361 } 2362 switch (fip->state) { 2363 case FIP_ST_VNMP_START: 2364 case FIP_ST_VNMP_PROBE1: 2365 case FIP_ST_VNMP_PROBE2: 2366 if (new->ids.port_id == fip->port_id) 2367 fcoe_ctlr_vn_restart(fip); 2368 break; 2369 case FIP_ST_VNMP_CLAIM: 2370 case FIP_ST_VNMP_UP: 2371 if (new->ids.port_id == fip->port_id) { 2372 if (new->ids.port_name > fip->lp->wwpn) { 2373 fcoe_ctlr_vn_restart(fip); 2374 break; 2375 } 2376 fcoe_ctlr_vn_send_claim(fip); 2377 break; 2378 } 2379 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac, 2380 min((u32)frport->fcoe_len, 2381 fcoe_ctlr_fcoe_size(fip))); 2382 fcoe_ctlr_vn_add(fip, new); 2383 break; 2384 default: 2385 break; 2386 } 2387 } 2388 2389 /** 2390 * fcoe_ctlr_vn_claim_resp() - handle received Claim Response 2391 * @fip: The FCoE controller that received the frame 2392 * @new: newly-parsed remote port with frport from the Claim Response 2393 * 2394 * Called with ctlr_mutex held. 2395 */ 2396 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip, 2397 struct fc_rport_priv *new) 2398 { 2399 LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n", 2400 new->ids.port_id, fcoe_ctlr_state(fip->state)); 2401 if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM) 2402 fcoe_ctlr_vn_add(fip, new); 2403 } 2404 2405 /** 2406 * fcoe_ctlr_vn_beacon() - handle received beacon. 2407 * @fip: The FCoE controller that received the frame 2408 * @new: newly-parsed remote port with frport from the Beacon 2409 * 2410 * Called with ctlr_mutex held. 2411 */ 2412 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip, 2413 struct fc_rport_priv *new) 2414 { 2415 struct fc_lport *lport = fip->lp; 2416 struct fc_rport_priv *rdata; 2417 struct fcoe_rport *frport; 2418 2419 frport = fcoe_ctlr_rport(new); 2420 if (frport->flags & FIP_FL_REC_OR_P2P) { 2421 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0); 2422 return; 2423 } 2424 mutex_lock(&lport->disc.disc_mutex); 2425 rdata = lport->tt.rport_lookup(lport, new->ids.port_id); 2426 if (rdata) 2427 kref_get(&rdata->kref); 2428 mutex_unlock(&lport->disc.disc_mutex); 2429 if (rdata) { 2430 if (rdata->ids.node_name == new->ids.node_name && 2431 rdata->ids.port_name == new->ids.port_name) { 2432 frport = fcoe_ctlr_rport(rdata); 2433 if (!frport->time && fip->state == FIP_ST_VNMP_UP) 2434 lport->tt.rport_login(rdata); 2435 frport->time = jiffies; 2436 } 2437 kref_put(&rdata->kref, lport->tt.rport_destroy); 2438 return; 2439 } 2440 if (fip->state != FIP_ST_VNMP_UP) 2441 return; 2442 2443 /* 2444 * Beacon from a new neighbor. 2445 * Send a claim notify if one hasn't been sent recently. 2446 * Don't add the neighbor yet. 2447 */ 2448 LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n", 2449 new->ids.port_id); 2450 if (time_after(jiffies, 2451 fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT))) 2452 fcoe_ctlr_vn_send_claim(fip); 2453 } 2454 2455 /** 2456 * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons 2457 * @fip: The FCoE controller 2458 * 2459 * Called with ctlr_mutex held. 2460 * Called only in state FIP_ST_VNMP_UP. 2461 * Returns the soonest time for next age-out or a time far in the future. 2462 */ 2463 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip) 2464 { 2465 struct fc_lport *lport = fip->lp; 2466 struct fc_rport_priv *rdata; 2467 struct fcoe_rport *frport; 2468 unsigned long next_time; 2469 unsigned long deadline; 2470 2471 next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10); 2472 mutex_lock(&lport->disc.disc_mutex); 2473 list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) { 2474 frport = fcoe_ctlr_rport(rdata); 2475 if (!frport->time) 2476 continue; 2477 deadline = frport->time + 2478 msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10); 2479 if (time_after_eq(jiffies, deadline)) { 2480 frport->time = 0; 2481 LIBFCOE_FIP_DBG(fip, 2482 "port %16.16llx fc_id %6.6x beacon expired\n", 2483 rdata->ids.port_name, rdata->ids.port_id); 2484 lport->tt.rport_logoff(rdata); 2485 } else if (time_before(deadline, next_time)) 2486 next_time = deadline; 2487 } 2488 mutex_unlock(&lport->disc.disc_mutex); 2489 return next_time; 2490 } 2491 2492 /** 2493 * fcoe_ctlr_vn_recv() - Receive a FIP frame 2494 * @fip: The FCoE controller that received the frame 2495 * @skb: The received FIP frame 2496 * 2497 * Returns non-zero if the frame is dropped. 2498 * Always consumes the frame. 2499 */ 2500 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb) 2501 { 2502 struct fip_header *fiph; 2503 enum fip_vn2vn_subcode sub; 2504 struct { 2505 struct fc_rport_priv rdata; 2506 struct fcoe_rport frport; 2507 } buf; 2508 int rc; 2509 2510 fiph = (struct fip_header *)skb->data; 2511 sub = fiph->fip_subcode; 2512 2513 rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata); 2514 if (rc) { 2515 LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc); 2516 goto drop; 2517 } 2518 2519 mutex_lock(&fip->ctlr_mutex); 2520 switch (sub) { 2521 case FIP_SC_VN_PROBE_REQ: 2522 fcoe_ctlr_vn_probe_req(fip, &buf.rdata); 2523 break; 2524 case FIP_SC_VN_PROBE_REP: 2525 fcoe_ctlr_vn_probe_reply(fip, &buf.rdata); 2526 break; 2527 case FIP_SC_VN_CLAIM_NOTIFY: 2528 fcoe_ctlr_vn_claim_notify(fip, &buf.rdata); 2529 break; 2530 case FIP_SC_VN_CLAIM_REP: 2531 fcoe_ctlr_vn_claim_resp(fip, &buf.rdata); 2532 break; 2533 case FIP_SC_VN_BEACON: 2534 fcoe_ctlr_vn_beacon(fip, &buf.rdata); 2535 break; 2536 default: 2537 LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub); 2538 rc = -1; 2539 break; 2540 } 2541 mutex_unlock(&fip->ctlr_mutex); 2542 drop: 2543 kfree_skb(skb); 2544 return rc; 2545 } 2546 2547 /** 2548 * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode. 2549 * @lport: The local port 2550 * @fp: The received frame 2551 * 2552 * This should never be called since we don't see RSCNs or other 2553 * fabric-generated ELSes. 2554 */ 2555 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp) 2556 { 2557 struct fc_seq_els_data rjt_data; 2558 2559 rjt_data.reason = ELS_RJT_UNSUP; 2560 rjt_data.explan = ELS_EXPL_NONE; 2561 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); 2562 fc_frame_free(fp); 2563 } 2564 2565 /** 2566 * fcoe_ctlr_disc_recv - start discovery for VN2VN mode. 2567 * @fip: The FCoE controller 2568 * 2569 * This sets a flag indicating that remote ports should be created 2570 * and started for the peers we discover. We use the disc_callback 2571 * pointer as that flag. Peers already discovered are created here. 2572 * 2573 * The lport lock is held during this call. The callback must be done 2574 * later, without holding either the lport or discovery locks. 2575 * The fcoe_ctlr lock may also be held during this call. 2576 */ 2577 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *, 2578 enum fc_disc_event), 2579 struct fc_lport *lport) 2580 { 2581 struct fc_disc *disc = &lport->disc; 2582 struct fcoe_ctlr *fip = disc->priv; 2583 2584 mutex_lock(&disc->disc_mutex); 2585 disc->disc_callback = callback; 2586 disc->disc_id = (disc->disc_id + 2) | 1; 2587 disc->pending = 1; 2588 schedule_work(&fip->timer_work); 2589 mutex_unlock(&disc->disc_mutex); 2590 } 2591 2592 /** 2593 * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state. 2594 * @fip: The FCoE controller 2595 * 2596 * Starts the FLOGI and PLOGI login process to each discovered rport for which 2597 * we've received at least one beacon. 2598 * Performs the discovery complete callback. 2599 */ 2600 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip) 2601 { 2602 struct fc_lport *lport = fip->lp; 2603 struct fc_disc *disc = &lport->disc; 2604 struct fc_rport_priv *rdata; 2605 struct fcoe_rport *frport; 2606 void (*callback)(struct fc_lport *, enum fc_disc_event); 2607 2608 mutex_lock(&disc->disc_mutex); 2609 callback = disc->pending ? disc->disc_callback : NULL; 2610 disc->pending = 0; 2611 list_for_each_entry_rcu(rdata, &disc->rports, peers) { 2612 frport = fcoe_ctlr_rport(rdata); 2613 if (frport->time) 2614 lport->tt.rport_login(rdata); 2615 } 2616 mutex_unlock(&disc->disc_mutex); 2617 if (callback) 2618 callback(lport, DISC_EV_SUCCESS); 2619 } 2620 2621 /** 2622 * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode. 2623 * @fip: The FCoE controller 2624 */ 2625 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip) 2626 { 2627 unsigned long next_time; 2628 u8 mac[ETH_ALEN]; 2629 u32 new_port_id = 0; 2630 2631 mutex_lock(&fip->ctlr_mutex); 2632 switch (fip->state) { 2633 case FIP_ST_VNMP_START: 2634 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1); 2635 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0); 2636 next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT); 2637 break; 2638 case FIP_ST_VNMP_PROBE1: 2639 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2); 2640 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0); 2641 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT); 2642 break; 2643 case FIP_ST_VNMP_PROBE2: 2644 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM); 2645 new_port_id = fip->port_id; 2646 hton24(mac, FIP_VN_FC_MAP); 2647 hton24(mac + 3, new_port_id); 2648 fcoe_ctlr_map_dest(fip); 2649 fip->update_mac(fip->lp, mac); 2650 fcoe_ctlr_vn_send_claim(fip); 2651 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT); 2652 break; 2653 case FIP_ST_VNMP_CLAIM: 2654 /* 2655 * This may be invoked either by starting discovery so don't 2656 * go to the next state unless it's been long enough. 2657 */ 2658 next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT); 2659 if (time_after_eq(jiffies, next_time)) { 2660 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP); 2661 fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON, 2662 fcoe_all_vn2vn, 0); 2663 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT); 2664 fip->port_ka_time = next_time; 2665 } 2666 fcoe_ctlr_vn_disc(fip); 2667 break; 2668 case FIP_ST_VNMP_UP: 2669 next_time = fcoe_ctlr_vn_age(fip); 2670 if (time_after_eq(jiffies, fip->port_ka_time)) { 2671 fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON, 2672 fcoe_all_vn2vn, 0); 2673 fip->port_ka_time = jiffies + 2674 msecs_to_jiffies(FIP_VN_BEACON_INT + 2675 (random32() % FIP_VN_BEACON_FUZZ)); 2676 } 2677 if (time_before(fip->port_ka_time, next_time)) 2678 next_time = fip->port_ka_time; 2679 break; 2680 case FIP_ST_LINK_WAIT: 2681 goto unlock; 2682 default: 2683 WARN(1, "unexpected state %d\n", fip->state); 2684 goto unlock; 2685 } 2686 mod_timer(&fip->timer, next_time); 2687 unlock: 2688 mutex_unlock(&fip->ctlr_mutex); 2689 2690 /* If port ID is new, notify local port after dropping ctlr_mutex */ 2691 if (new_port_id) 2692 fc_lport_set_local_id(fip->lp, new_port_id); 2693 } 2694 2695 /** 2696 * fcoe_libfc_config() - Sets up libfc related properties for local port 2697 * @lp: The local port to configure libfc for 2698 * @fip: The FCoE controller in use by the local port 2699 * @tt: The libfc function template 2700 * @init_fcp: If non-zero, the FCP portion of libfc should be initialized 2701 * 2702 * Returns : 0 for success 2703 */ 2704 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip, 2705 const struct libfc_function_template *tt, int init_fcp) 2706 { 2707 /* Set the function pointers set by the LLDD */ 2708 memcpy(&lport->tt, tt, sizeof(*tt)); 2709 if (init_fcp && fc_fcp_init(lport)) 2710 return -ENOMEM; 2711 fc_exch_init(lport); 2712 fc_elsct_init(lport); 2713 fc_lport_init(lport); 2714 if (fip->mode == FIP_MODE_VN2VN) 2715 lport->rport_priv_size = sizeof(struct fcoe_rport); 2716 fc_rport_init(lport); 2717 if (fip->mode == FIP_MODE_VN2VN) { 2718 lport->point_to_multipoint = 1; 2719 lport->tt.disc_recv_req = fcoe_ctlr_disc_recv; 2720 lport->tt.disc_start = fcoe_ctlr_disc_start; 2721 lport->tt.disc_stop = fcoe_ctlr_disc_stop; 2722 lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final; 2723 mutex_init(&lport->disc.disc_mutex); 2724 INIT_LIST_HEAD(&lport->disc.rports); 2725 lport->disc.priv = fip; 2726 } else { 2727 fc_disc_init(lport); 2728 } 2729 return 0; 2730 } 2731 EXPORT_SYMBOL_GPL(fcoe_libfc_config); 2732