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spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / drivers / scsi / fcoe / fcoe_ctlr.c
blobe7522dcc296eb8bb9c425da842f2a159d05862f2
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);