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9b34ecff | 1 | /* |
97c8389d JE |
2 | * Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved. |
3 | * Copyright (c) 2009 Intel Corporation. All rights reserved. | |
9b34ecff VD |
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 | ||
97c8389d | 21 | #include <linux/types.h> |
9b34ecff | 22 | #include <linux/module.h> |
97c8389d JE |
23 | #include <linux/kernel.h> |
24 | #include <linux/list.h> | |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/timer.h> | |
5e80f7f7 | 27 | #include <linux/netdevice.h> |
97c8389d JE |
28 | #include <linux/etherdevice.h> |
29 | #include <linux/ethtool.h> | |
30 | #include <linux/if_ether.h> | |
31 | #include <linux/if_vlan.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/bitops.h> | |
35 | #include <net/rtnetlink.h> | |
36 | ||
37 | #include <scsi/fc/fc_els.h> | |
38 | #include <scsi/fc/fc_fs.h> | |
39 | #include <scsi/fc/fc_fip.h> | |
40 | #include <scsi/fc/fc_encaps.h> | |
41 | #include <scsi/fc/fc_fcoe.h> | |
5e80f7f7 VD |
42 | |
43 | #include <scsi/libfc.h> | |
97c8389d | 44 | #include <scsi/libfcoe.h> |
9b34ecff VD |
45 | |
46 | MODULE_AUTHOR("Open-FCoE.org"); | |
97c8389d | 47 | MODULE_DESCRIPTION("FIP discovery protocol support for FCoE HBAs"); |
9b34ecff | 48 | MODULE_LICENSE("GPL v2"); |
5e80f7f7 | 49 | |
97c8389d JE |
50 | #define FCOE_CTLR_MIN_FKA 500 /* min keep alive (mS) */ |
51 | #define FCOE_CTLR_DEF_FKA FIP_DEF_FKA /* default keep alive (mS) */ | |
52 | ||
53 | static void fcoe_ctlr_timeout(unsigned long); | |
54 | static void fcoe_ctlr_link_work(struct work_struct *); | |
55 | static void fcoe_ctlr_recv_work(struct work_struct *); | |
56 | ||
57 | static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS; | |
58 | ||
59 | static u32 fcoe_ctlr_debug; /* 1 for basic, 2 for noisy debug */ | |
60 | ||
61 | #define FIP_DBG_LVL(level, fmt, args...) \ | |
62 | do { \ | |
63 | if (fcoe_ctlr_debug >= (level)) \ | |
64 | FC_DBG(fmt, ##args); \ | |
65 | } while (0) | |
66 | ||
67 | #define FIP_DBG(fmt, args...) FIP_DBG_LVL(1, fmt, ##args) | |
68 | ||
69 | /* | |
70 | * Return non-zero if FCF fcoe_size has been validated. | |
71 | */ | |
72 | static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf) | |
73 | { | |
74 | return (fcf->flags & FIP_FL_SOL) != 0; | |
75 | } | |
76 | ||
77 | /* | |
78 | * Return non-zero if the FCF is usable. | |
79 | */ | |
80 | static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf) | |
81 | { | |
82 | u16 flags = FIP_FL_SOL | FIP_FL_AVAIL; | |
83 | ||
84 | return (fcf->flags & flags) == flags; | |
85 | } | |
86 | ||
87 | /** | |
88 | * fcoe_ctlr_init() - Initialize the FCoE Controller instance. | |
89 | * @fip: FCoE controller. | |
90 | */ | |
91 | void fcoe_ctlr_init(struct fcoe_ctlr *fip) | |
92 | { | |
93 | fip->state = FIP_ST_LINK_WAIT; | |
94 | INIT_LIST_HEAD(&fip->fcfs); | |
95 | spin_lock_init(&fip->lock); | |
96 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
97 | setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip); | |
98 | INIT_WORK(&fip->link_work, fcoe_ctlr_link_work); | |
99 | INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work); | |
100 | skb_queue_head_init(&fip->fip_recv_list); | |
101 | } | |
102 | EXPORT_SYMBOL(fcoe_ctlr_init); | |
103 | ||
104 | /** | |
105 | * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller. | |
106 | * @fip: FCoE controller. | |
107 | * | |
108 | * Called with &fcoe_ctlr lock held. | |
109 | */ | |
110 | static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip) | |
111 | { | |
112 | struct fcoe_fcf *fcf; | |
113 | struct fcoe_fcf *next; | |
114 | ||
115 | fip->sel_fcf = NULL; | |
116 | list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { | |
117 | list_del(&fcf->list); | |
118 | kfree(fcf); | |
119 | } | |
120 | fip->fcf_count = 0; | |
121 | fip->sel_time = 0; | |
122 | } | |
123 | ||
124 | /** | |
125 | * fcoe_ctrl_destroy() - Disable and tear-down the FCoE controller. | |
126 | * @fip: FCoE controller. | |
127 | * | |
128 | * This is called by FCoE drivers before freeing the &fcoe_ctlr. | |
129 | * | |
130 | * The receive handler will have been deleted before this to guarantee | |
131 | * that no more recv_work will be scheduled. | |
132 | * | |
133 | * The timer routine will simply return once we set FIP_ST_DISABLED. | |
134 | * This guarantees that no further timeouts or work will be scheduled. | |
135 | */ | |
136 | void fcoe_ctlr_destroy(struct fcoe_ctlr *fip) | |
137 | { | |
138 | flush_work(&fip->recv_work); | |
139 | spin_lock_bh(&fip->lock); | |
140 | fip->state = FIP_ST_DISABLED; | |
141 | fcoe_ctlr_reset_fcfs(fip); | |
142 | spin_unlock_bh(&fip->lock); | |
143 | del_timer_sync(&fip->timer); | |
144 | flush_work(&fip->link_work); | |
145 | } | |
146 | EXPORT_SYMBOL(fcoe_ctlr_destroy); | |
147 | ||
148 | /** | |
149 | * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port. | |
150 | * @fip: FCoE controller. | |
151 | * | |
152 | * Returns the maximum packet size including the FCoE header and trailer, | |
153 | * but not including any Ethernet or VLAN headers. | |
154 | */ | |
155 | static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip) | |
156 | { | |
157 | /* | |
158 | * Determine the max FCoE frame size allowed, including | |
159 | * FCoE header and trailer. | |
160 | * Note: lp->mfs is currently the payload size, not the frame size. | |
161 | */ | |
162 | return fip->lp->mfs + sizeof(struct fc_frame_header) + | |
163 | sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof); | |
164 | } | |
165 | ||
166 | /** | |
167 | * fcoe_ctlr_solicit() - Send a solicitation. | |
168 | * @fip: FCoE controller. | |
169 | * @fcf: Destination FCF. If NULL, a multicast solicitation is sent. | |
170 | */ | |
171 | static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf) | |
172 | { | |
173 | struct sk_buff *skb; | |
174 | struct fip_sol { | |
175 | struct ethhdr eth; | |
176 | struct fip_header fip; | |
177 | struct { | |
178 | struct fip_mac_desc mac; | |
179 | struct fip_wwn_desc wwnn; | |
180 | struct fip_size_desc size; | |
181 | } __attribute__((packed)) desc; | |
182 | } __attribute__((packed)) *sol; | |
183 | u32 fcoe_size; | |
184 | ||
185 | skb = dev_alloc_skb(sizeof(*sol)); | |
186 | if (!skb) | |
187 | return; | |
188 | ||
189 | sol = (struct fip_sol *)skb->data; | |
190 | ||
191 | memset(sol, 0, sizeof(*sol)); | |
192 | memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN); | |
193 | memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN); | |
194 | sol->eth.h_proto = htons(ETH_P_FIP); | |
195 | ||
196 | sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); | |
197 | sol->fip.fip_op = htons(FIP_OP_DISC); | |
198 | sol->fip.fip_subcode = FIP_SC_SOL; | |
199 | sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW); | |
200 | sol->fip.fip_flags = htons(FIP_FL_FPMA); | |
201 | ||
202 | sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC; | |
203 | sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW; | |
204 | memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); | |
205 | ||
206 | sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME; | |
207 | sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW; | |
208 | put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn); | |
209 | ||
210 | fcoe_size = fcoe_ctlr_fcoe_size(fip); | |
211 | sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE; | |
212 | sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW; | |
213 | sol->desc.size.fd_size = htons(fcoe_size); | |
214 | ||
215 | skb_put(skb, sizeof(*sol)); | |
216 | skb->protocol = htons(ETH_P_802_3); | |
217 | skb_reset_mac_header(skb); | |
218 | skb_reset_network_header(skb); | |
219 | fip->send(fip, skb); | |
220 | ||
221 | if (!fcf) | |
222 | fip->sol_time = jiffies; | |
223 | } | |
224 | ||
225 | /** | |
226 | * fcoe_ctlr_link_up() - Start FCoE controller. | |
227 | * @fip: FCoE controller. | |
228 | * | |
229 | * Called from the LLD when the network link is ready. | |
230 | */ | |
231 | void fcoe_ctlr_link_up(struct fcoe_ctlr *fip) | |
232 | { | |
233 | spin_lock_bh(&fip->lock); | |
234 | if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) { | |
235 | fip->last_link = 1; | |
236 | fip->link = 1; | |
237 | spin_unlock_bh(&fip->lock); | |
238 | fc_linkup(fip->lp); | |
239 | } else if (fip->state == FIP_ST_LINK_WAIT) { | |
240 | fip->state = FIP_ST_AUTO; | |
241 | fip->last_link = 1; | |
242 | fip->link = 1; | |
243 | spin_unlock_bh(&fip->lock); | |
244 | FIP_DBG("%s", "setting AUTO mode.\n"); | |
245 | fc_linkup(fip->lp); | |
246 | fcoe_ctlr_solicit(fip, NULL); | |
247 | } else | |
248 | spin_unlock_bh(&fip->lock); | |
249 | } | |
250 | EXPORT_SYMBOL(fcoe_ctlr_link_up); | |
251 | ||
252 | /** | |
253 | * fcoe_ctlr_reset() - Reset FIP. | |
254 | * @fip: FCoE controller. | |
255 | * @new_state: FIP state to be entered. | |
256 | * | |
257 | * Returns non-zero if the link was up and now isn't. | |
258 | */ | |
259 | static int fcoe_ctlr_reset(struct fcoe_ctlr *fip, enum fip_state new_state) | |
260 | { | |
261 | struct fc_lport *lp = fip->lp; | |
262 | int link_dropped; | |
263 | ||
264 | spin_lock_bh(&fip->lock); | |
265 | fcoe_ctlr_reset_fcfs(fip); | |
266 | del_timer(&fip->timer); | |
267 | fip->state = new_state; | |
268 | fip->ctlr_ka_time = 0; | |
269 | fip->port_ka_time = 0; | |
270 | fip->sol_time = 0; | |
271 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
272 | fip->map_dest = 0; | |
273 | fip->last_link = 0; | |
274 | link_dropped = fip->link; | |
275 | fip->link = 0; | |
276 | spin_unlock_bh(&fip->lock); | |
277 | ||
278 | if (link_dropped) | |
279 | fc_linkdown(lp); | |
280 | ||
281 | if (new_state == FIP_ST_ENABLED) { | |
282 | fcoe_ctlr_solicit(fip, NULL); | |
283 | fc_linkup(lp); | |
284 | link_dropped = 0; | |
285 | } | |
286 | return link_dropped; | |
287 | } | |
288 | ||
289 | /** | |
290 | * fcoe_ctlr_link_down() - Stop FCoE controller. | |
291 | * @fip: FCoE controller. | |
292 | * | |
293 | * Returns non-zero if the link was up and now isn't. | |
294 | * | |
295 | * Called from the LLD when the network link is not ready. | |
296 | * There may be multiple calls while the link is down. | |
297 | */ | |
298 | int fcoe_ctlr_link_down(struct fcoe_ctlr *fip) | |
299 | { | |
300 | return fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT); | |
301 | } | |
302 | EXPORT_SYMBOL(fcoe_ctlr_link_down); | |
303 | ||
304 | /** | |
305 | * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF. | |
306 | * @fip: FCoE controller. | |
307 | * @ports: 0 for controller keep-alive, 1 for port keep-alive. | |
308 | * @sa: source MAC address. | |
309 | * | |
310 | * A controller keep-alive is sent every fka_period (typically 8 seconds). | |
311 | * The source MAC is the native MAC address. | |
312 | * | |
313 | * A port keep-alive is sent every 90 seconds while logged in. | |
314 | * The source MAC is the assigned mapped source address. | |
315 | * The destination is the FCF's F-port. | |
316 | */ | |
317 | static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip, int ports, u8 *sa) | |
318 | { | |
319 | struct sk_buff *skb; | |
320 | struct fip_kal { | |
321 | struct ethhdr eth; | |
322 | struct fip_header fip; | |
323 | struct fip_mac_desc mac; | |
324 | } __attribute__((packed)) *kal; | |
325 | struct fip_vn_desc *vn; | |
326 | u32 len; | |
327 | struct fc_lport *lp; | |
328 | struct fcoe_fcf *fcf; | |
329 | ||
330 | fcf = fip->sel_fcf; | |
331 | lp = fip->lp; | |
332 | if (!fcf || !fc_host_port_id(lp->host)) | |
333 | return; | |
334 | ||
335 | len = fcoe_ctlr_fcoe_size(fip) + sizeof(struct ethhdr); | |
336 | BUG_ON(len < sizeof(*kal) + sizeof(*vn)); | |
337 | skb = dev_alloc_skb(len); | |
338 | if (!skb) | |
339 | return; | |
340 | ||
341 | kal = (struct fip_kal *)skb->data; | |
342 | memset(kal, 0, len); | |
343 | memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN); | |
344 | memcpy(kal->eth.h_source, sa, ETH_ALEN); | |
345 | kal->eth.h_proto = htons(ETH_P_FIP); | |
346 | ||
347 | kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); | |
348 | kal->fip.fip_op = htons(FIP_OP_CTRL); | |
349 | kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE; | |
350 | kal->fip.fip_dl_len = htons((sizeof(kal->mac) + | |
351 | ports * sizeof(*vn)) / FIP_BPW); | |
352 | kal->fip.fip_flags = htons(FIP_FL_FPMA); | |
353 | ||
354 | kal->mac.fd_desc.fip_dtype = FIP_DT_MAC; | |
355 | kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW; | |
356 | memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); | |
357 | ||
358 | if (ports) { | |
359 | vn = (struct fip_vn_desc *)(kal + 1); | |
360 | vn->fd_desc.fip_dtype = FIP_DT_VN_ID; | |
361 | vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW; | |
362 | memcpy(vn->fd_mac, fip->data_src_addr, ETH_ALEN); | |
363 | hton24(vn->fd_fc_id, fc_host_port_id(lp->host)); | |
364 | put_unaligned_be64(lp->wwpn, &vn->fd_wwpn); | |
365 | } | |
366 | ||
367 | skb_put(skb, len); | |
368 | skb->protocol = htons(ETH_P_802_3); | |
369 | skb_reset_mac_header(skb); | |
370 | skb_reset_network_header(skb); | |
371 | fip->send(fip, skb); | |
372 | } | |
373 | ||
374 | /** | |
375 | * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it. | |
376 | * @fip: FCoE controller. | |
377 | * @dtype: FIP descriptor type for the frame. | |
378 | * @skb: FCoE ELS frame including FC header but no FCoE headers. | |
379 | * | |
380 | * Returns non-zero error code on failure. | |
381 | * | |
382 | * The caller must check that the length is a multiple of 4. | |
383 | * | |
384 | * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes). | |
385 | * Headroom includes the FIP encapsulation description, FIP header, and | |
386 | * Ethernet header. The tailroom is for the FIP MAC descriptor. | |
387 | */ | |
388 | static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, | |
389 | u8 dtype, struct sk_buff *skb) | |
390 | { | |
391 | struct fip_encaps_head { | |
392 | struct ethhdr eth; | |
393 | struct fip_header fip; | |
394 | struct fip_encaps encaps; | |
395 | } __attribute__((packed)) *cap; | |
396 | struct fip_mac_desc *mac; | |
397 | struct fcoe_fcf *fcf; | |
398 | size_t dlen; | |
399 | ||
400 | fcf = fip->sel_fcf; | |
401 | if (!fcf) | |
402 | return -ENODEV; | |
403 | dlen = sizeof(struct fip_encaps) + skb->len; /* len before push */ | |
404 | cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap)); | |
405 | ||
406 | memset(cap, 0, sizeof(*cap)); | |
407 | memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN); | |
408 | memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN); | |
409 | cap->eth.h_proto = htons(ETH_P_FIP); | |
410 | ||
411 | cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); | |
412 | cap->fip.fip_op = htons(FIP_OP_LS); | |
413 | cap->fip.fip_subcode = FIP_SC_REQ; | |
414 | cap->fip.fip_dl_len = htons((dlen + sizeof(*mac)) / FIP_BPW); | |
415 | cap->fip.fip_flags = htons(FIP_FL_FPMA); | |
416 | ||
417 | cap->encaps.fd_desc.fip_dtype = dtype; | |
418 | cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW; | |
419 | ||
420 | mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac)); | |
421 | memset(mac, 0, sizeof(mac)); | |
422 | mac->fd_desc.fip_dtype = FIP_DT_MAC; | |
423 | mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW; | |
424 | if (dtype != ELS_FLOGI) | |
425 | memcpy(mac->fd_mac, fip->data_src_addr, ETH_ALEN); | |
426 | ||
427 | skb->protocol = htons(ETH_P_802_3); | |
428 | skb_reset_mac_header(skb); | |
429 | skb_reset_network_header(skb); | |
430 | return 0; | |
431 | } | |
432 | ||
433 | /** | |
434 | * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate. | |
435 | * @fip: FCoE controller. | |
436 | * @skb: FCoE ELS frame including FC header but no FCoE headers. | |
437 | * | |
438 | * Returns a non-zero error code if the frame should not be sent. | |
439 | * Returns zero if the caller should send the frame with FCoE encapsulation. | |
440 | * | |
441 | * The caller must check that the length is a multiple of 4. | |
442 | * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes). | |
443 | */ | |
444 | int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
445 | { | |
446 | struct fc_frame_header *fh; | |
447 | u16 old_xid; | |
448 | u8 op; | |
449 | ||
450 | if (fip->state == FIP_ST_NON_FIP) | |
451 | return 0; | |
452 | ||
453 | fh = (struct fc_frame_header *)skb->data; | |
454 | op = *(u8 *)(fh + 1); | |
455 | ||
456 | switch (op) { | |
457 | case ELS_FLOGI: | |
458 | old_xid = fip->flogi_oxid; | |
459 | fip->flogi_oxid = ntohs(fh->fh_ox_id); | |
460 | if (fip->state == FIP_ST_AUTO) { | |
461 | if (old_xid == FC_XID_UNKNOWN) | |
462 | fip->flogi_count = 0; | |
463 | fip->flogi_count++; | |
464 | if (fip->flogi_count < 3) | |
465 | goto drop; | |
466 | fip->map_dest = 1; | |
467 | return 0; | |
468 | } | |
469 | op = FIP_DT_FLOGI; | |
470 | break; | |
471 | case ELS_FDISC: | |
472 | if (ntoh24(fh->fh_s_id)) | |
473 | return 0; | |
474 | op = FIP_DT_FDISC; | |
475 | break; | |
476 | case ELS_LOGO: | |
477 | if (fip->state != FIP_ST_ENABLED) | |
478 | return 0; | |
479 | if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) | |
480 | return 0; | |
481 | op = FIP_DT_LOGO; | |
482 | break; | |
483 | case ELS_LS_ACC: | |
484 | if (fip->flogi_oxid == FC_XID_UNKNOWN) | |
485 | return 0; | |
486 | if (!ntoh24(fh->fh_s_id)) | |
487 | return 0; | |
488 | if (fip->state == FIP_ST_AUTO) | |
489 | return 0; | |
490 | /* | |
491 | * Here we must've gotten an SID by accepting an FLOGI | |
492 | * from a point-to-point connection. Switch to using | |
493 | * the source mac based on the SID. The destination | |
494 | * MAC in this case would have been set by receving the | |
495 | * FLOGI. | |
496 | */ | |
497 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
498 | fc_fcoe_set_mac(fip->data_src_addr, fh->fh_s_id); | |
499 | return 0; | |
500 | default: | |
501 | if (fip->state != FIP_ST_ENABLED) | |
502 | goto drop; | |
503 | return 0; | |
504 | } | |
505 | if (fcoe_ctlr_encaps(fip, op, skb)) | |
506 | goto drop; | |
507 | fip->send(fip, skb); | |
508 | return -EINPROGRESS; | |
509 | drop: | |
510 | kfree_skb(skb); | |
511 | return -EINVAL; | |
512 | } | |
513 | EXPORT_SYMBOL(fcoe_ctlr_els_send); | |
514 | ||
515 | /* | |
516 | * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller. | |
517 | * @fip: FCoE controller. | |
518 | * | |
519 | * Called with lock held. | |
520 | * | |
521 | * An FCF is considered old if we have missed three advertisements. | |
522 | * That is, there have been no valid advertisement from it for three | |
523 | * times its keep-alive period including fuzz. | |
524 | * | |
525 | * In addition, determine the time when an FCF selection can occur. | |
526 | */ | |
527 | static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip) | |
528 | { | |
529 | struct fcoe_fcf *fcf; | |
530 | struct fcoe_fcf *next; | |
531 | unsigned long sel_time = 0; | |
532 | ||
533 | list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { | |
534 | if (time_after(jiffies, fcf->time + fcf->fka_period * 3 + | |
535 | msecs_to_jiffies(FIP_FCF_FUZZ * 3))) { | |
536 | if (fip->sel_fcf == fcf) | |
537 | fip->sel_fcf = NULL; | |
538 | list_del(&fcf->list); | |
539 | WARN_ON(!fip->fcf_count); | |
540 | fip->fcf_count--; | |
541 | kfree(fcf); | |
542 | } else if (fcoe_ctlr_mtu_valid(fcf) && | |
543 | (!sel_time || time_before(sel_time, fcf->time))) { | |
544 | sel_time = fcf->time; | |
545 | } | |
546 | } | |
547 | if (sel_time) { | |
548 | sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY); | |
549 | fip->sel_time = sel_time; | |
550 | if (time_before(sel_time, fip->timer.expires)) | |
551 | mod_timer(&fip->timer, sel_time); | |
552 | } else { | |
553 | fip->sel_time = 0; | |
554 | } | |
555 | } | |
556 | ||
557 | /** | |
558 | * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry. | |
559 | * @skb: received FIP advertisement frame | |
560 | * @fcf: resulting FCF entry. | |
561 | * | |
562 | * Returns zero on a valid parsed advertisement, | |
563 | * otherwise returns non zero value. | |
564 | */ | |
565 | static int fcoe_ctlr_parse_adv(struct sk_buff *skb, struct fcoe_fcf *fcf) | |
566 | { | |
567 | struct fip_header *fiph; | |
568 | struct fip_desc *desc = NULL; | |
569 | struct fip_wwn_desc *wwn; | |
570 | struct fip_fab_desc *fab; | |
571 | struct fip_fka_desc *fka; | |
572 | unsigned long t; | |
573 | size_t rlen; | |
574 | size_t dlen; | |
575 | ||
576 | memset(fcf, 0, sizeof(*fcf)); | |
577 | fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA); | |
578 | ||
579 | fiph = (struct fip_header *)skb->data; | |
580 | fcf->flags = ntohs(fiph->fip_flags); | |
581 | ||
582 | rlen = ntohs(fiph->fip_dl_len) * 4; | |
583 | if (rlen + sizeof(*fiph) > skb->len) | |
584 | return -EINVAL; | |
585 | ||
586 | desc = (struct fip_desc *)(fiph + 1); | |
587 | while (rlen > 0) { | |
588 | dlen = desc->fip_dlen * FIP_BPW; | |
589 | if (dlen < sizeof(*desc) || dlen > rlen) | |
590 | return -EINVAL; | |
591 | switch (desc->fip_dtype) { | |
592 | case FIP_DT_PRI: | |
593 | if (dlen != sizeof(struct fip_pri_desc)) | |
594 | goto len_err; | |
595 | fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri; | |
596 | break; | |
597 | case FIP_DT_MAC: | |
598 | if (dlen != sizeof(struct fip_mac_desc)) | |
599 | goto len_err; | |
600 | memcpy(fcf->fcf_mac, | |
601 | ((struct fip_mac_desc *)desc)->fd_mac, | |
602 | ETH_ALEN); | |
603 | if (!is_valid_ether_addr(fcf->fcf_mac)) { | |
604 | FIP_DBG("invalid MAC addr in FIP adv\n"); | |
605 | return -EINVAL; | |
606 | } | |
607 | break; | |
608 | case FIP_DT_NAME: | |
609 | if (dlen != sizeof(struct fip_wwn_desc)) | |
610 | goto len_err; | |
611 | wwn = (struct fip_wwn_desc *)desc; | |
612 | fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn); | |
613 | break; | |
614 | case FIP_DT_FAB: | |
615 | if (dlen != sizeof(struct fip_fab_desc)) | |
616 | goto len_err; | |
617 | fab = (struct fip_fab_desc *)desc; | |
618 | fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn); | |
619 | fcf->vfid = ntohs(fab->fd_vfid); | |
620 | fcf->fc_map = ntoh24(fab->fd_map); | |
621 | break; | |
622 | case FIP_DT_FKA: | |
623 | if (dlen != sizeof(struct fip_fka_desc)) | |
624 | goto len_err; | |
625 | fka = (struct fip_fka_desc *)desc; | |
626 | t = ntohl(fka->fd_fka_period); | |
627 | if (t >= FCOE_CTLR_MIN_FKA) | |
628 | fcf->fka_period = msecs_to_jiffies(t); | |
629 | break; | |
630 | case FIP_DT_MAP_OUI: | |
631 | case FIP_DT_FCOE_SIZE: | |
632 | case FIP_DT_FLOGI: | |
633 | case FIP_DT_FDISC: | |
634 | case FIP_DT_LOGO: | |
635 | case FIP_DT_ELP: | |
636 | default: | |
637 | FIP_DBG("unexpected descriptor type %x in FIP adv\n", | |
638 | desc->fip_dtype); | |
639 | /* standard says ignore unknown descriptors >= 128 */ | |
640 | if (desc->fip_dtype < FIP_DT_VENDOR_BASE) | |
641 | return -EINVAL; | |
642 | continue; | |
643 | } | |
644 | desc = (struct fip_desc *)((char *)desc + dlen); | |
645 | rlen -= dlen; | |
646 | } | |
647 | if (!fcf->fc_map || (fcf->fc_map & 0x10000)) | |
648 | return -EINVAL; | |
649 | if (!fcf->switch_name || !fcf->fabric_name) | |
650 | return -EINVAL; | |
651 | return 0; | |
652 | ||
653 | len_err: | |
654 | FIP_DBG("FIP length error in descriptor type %x len %zu\n", | |
655 | desc->fip_dtype, dlen); | |
656 | return -EINVAL; | |
657 | } | |
658 | ||
659 | /** | |
660 | * fcoe_ctlr_recv_adv() - Handle an incoming advertisement. | |
661 | * @fip: FCoE controller. | |
662 | * @skb: Received FIP packet. | |
663 | */ | |
664 | static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
665 | { | |
666 | struct fcoe_fcf *fcf; | |
667 | struct fcoe_fcf new; | |
668 | struct fcoe_fcf *found; | |
669 | unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV); | |
670 | int first = 0; | |
671 | int mtu_valid; | |
672 | ||
673 | if (fcoe_ctlr_parse_adv(skb, &new)) | |
674 | return; | |
675 | ||
676 | spin_lock_bh(&fip->lock); | |
677 | first = list_empty(&fip->fcfs); | |
678 | found = NULL; | |
679 | list_for_each_entry(fcf, &fip->fcfs, list) { | |
680 | if (fcf->switch_name == new.switch_name && | |
681 | fcf->fabric_name == new.fabric_name && | |
682 | fcf->fc_map == new.fc_map && | |
683 | compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) { | |
684 | found = fcf; | |
685 | break; | |
686 | } | |
687 | } | |
688 | if (!found) { | |
689 | if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT) | |
690 | goto out; | |
691 | ||
692 | fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC); | |
693 | if (!fcf) | |
694 | goto out; | |
695 | ||
696 | fip->fcf_count++; | |
697 | memcpy(fcf, &new, sizeof(new)); | |
698 | list_add(&fcf->list, &fip->fcfs); | |
699 | } else { | |
700 | /* | |
701 | * Flags in advertisements are ignored once the FCF is | |
702 | * selected. Flags in unsolicited advertisements are | |
703 | * ignored after a usable solicited advertisement | |
704 | * has been received. | |
705 | */ | |
706 | if (fcf == fip->sel_fcf) { | |
707 | fip->ctlr_ka_time -= fcf->fka_period; | |
708 | fip->ctlr_ka_time += new.fka_period; | |
709 | if (time_before(fip->ctlr_ka_time, fip->timer.expires)) | |
710 | mod_timer(&fip->timer, fip->ctlr_ka_time); | |
711 | } else if (!fcoe_ctlr_fcf_usable(fcf)) | |
712 | fcf->flags = new.flags; | |
713 | fcf->fka_period = new.fka_period; | |
714 | memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN); | |
715 | } | |
716 | mtu_valid = fcoe_ctlr_mtu_valid(fcf); | |
717 | fcf->time = jiffies; | |
718 | FIP_DBG_LVL(found ? 2 : 1, "%s FCF for fab %llx map %x val %d\n", | |
719 | found ? "old" : "new", | |
720 | fcf->fabric_name, fcf->fc_map, mtu_valid); | |
721 | ||
722 | /* | |
723 | * If this advertisement is not solicited and our max receive size | |
724 | * hasn't been verified, send a solicited advertisement. | |
725 | */ | |
726 | if (!mtu_valid) | |
727 | fcoe_ctlr_solicit(fip, fcf); | |
728 | ||
729 | /* | |
730 | * If its been a while since we did a solicit, and this is | |
731 | * the first advertisement we've received, do a multicast | |
732 | * solicitation to gather as many advertisements as we can | |
733 | * before selection occurs. | |
734 | */ | |
735 | if (first && time_after(jiffies, fip->sol_time + sol_tov)) | |
736 | fcoe_ctlr_solicit(fip, NULL); | |
737 | ||
738 | /* | |
739 | * If this is the first validated FCF, note the time and | |
740 | * set a timer to trigger selection. | |
741 | */ | |
742 | if (mtu_valid && !fip->sel_time && fcoe_ctlr_fcf_usable(fcf)) { | |
743 | fip->sel_time = jiffies + | |
744 | msecs_to_jiffies(FCOE_CTLR_START_DELAY); | |
745 | if (!timer_pending(&fip->timer) || | |
746 | time_before(fip->sel_time, fip->timer.expires)) | |
747 | mod_timer(&fip->timer, fip->sel_time); | |
748 | } | |
749 | out: | |
750 | spin_unlock_bh(&fip->lock); | |
751 | } | |
752 | ||
753 | /** | |
754 | * fcoe_ctlr_recv_els() - Handle an incoming FIP-encapsulated ELS frame. | |
755 | * @fip: FCoE controller. | |
756 | * @skb: Received FIP packet. | |
757 | */ | |
758 | static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
759 | { | |
760 | struct fc_lport *lp = fip->lp; | |
761 | struct fip_header *fiph; | |
762 | struct fc_frame *fp; | |
763 | struct fc_frame_header *fh = NULL; | |
764 | struct fip_desc *desc; | |
765 | struct fip_encaps *els; | |
766 | struct fcoe_dev_stats *stats; | |
767 | enum fip_desc_type els_dtype = 0; | |
768 | u8 els_op; | |
769 | u8 sub; | |
770 | u8 granted_mac[ETH_ALEN] = { 0 }; | |
771 | size_t els_len = 0; | |
772 | size_t rlen; | |
773 | size_t dlen; | |
774 | ||
775 | fiph = (struct fip_header *)skb->data; | |
776 | sub = fiph->fip_subcode; | |
777 | if (sub != FIP_SC_REQ && sub != FIP_SC_REP) | |
778 | goto drop; | |
779 | ||
780 | rlen = ntohs(fiph->fip_dl_len) * 4; | |
781 | if (rlen + sizeof(*fiph) > skb->len) | |
782 | goto drop; | |
783 | ||
784 | desc = (struct fip_desc *)(fiph + 1); | |
785 | while (rlen > 0) { | |
786 | dlen = desc->fip_dlen * FIP_BPW; | |
787 | if (dlen < sizeof(*desc) || dlen > rlen) | |
788 | goto drop; | |
789 | switch (desc->fip_dtype) { | |
790 | case FIP_DT_MAC: | |
791 | if (dlen != sizeof(struct fip_mac_desc)) | |
792 | goto len_err; | |
793 | memcpy(granted_mac, | |
794 | ((struct fip_mac_desc *)desc)->fd_mac, | |
795 | ETH_ALEN); | |
796 | if (!is_valid_ether_addr(granted_mac)) { | |
797 | FIP_DBG("invalid MAC addrs in FIP ELS\n"); | |
798 | goto drop; | |
799 | } | |
800 | break; | |
801 | case FIP_DT_FLOGI: | |
802 | case FIP_DT_FDISC: | |
803 | case FIP_DT_LOGO: | |
804 | case FIP_DT_ELP: | |
805 | if (fh) | |
806 | goto drop; | |
807 | if (dlen < sizeof(*els) + sizeof(*fh) + 1) | |
808 | goto len_err; | |
809 | els_len = dlen - sizeof(*els); | |
810 | els = (struct fip_encaps *)desc; | |
811 | fh = (struct fc_frame_header *)(els + 1); | |
812 | els_dtype = desc->fip_dtype; | |
813 | break; | |
814 | default: | |
815 | FIP_DBG("unexpected descriptor type %x " | |
816 | "in FIP adv\n", desc->fip_dtype); | |
817 | /* standard says ignore unknown descriptors >= 128 */ | |
818 | if (desc->fip_dtype < FIP_DT_VENDOR_BASE) | |
819 | goto drop; | |
820 | continue; | |
821 | } | |
822 | desc = (struct fip_desc *)((char *)desc + dlen); | |
823 | rlen -= dlen; | |
824 | } | |
825 | ||
826 | if (!fh) | |
827 | goto drop; | |
828 | els_op = *(u8 *)(fh + 1); | |
829 | ||
830 | if (els_dtype == FIP_DT_FLOGI && sub == FIP_SC_REP && | |
831 | fip->flogi_oxid == ntohs(fh->fh_ox_id) && | |
832 | els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac)) { | |
833 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
834 | fip->update_mac(fip, fip->data_src_addr, granted_mac); | |
835 | memcpy(fip->data_src_addr, granted_mac, ETH_ALEN); | |
836 | } | |
837 | ||
838 | /* | |
839 | * Convert skb into an fc_frame containing only the ELS. | |
840 | */ | |
841 | skb_pull(skb, (u8 *)fh - skb->data); | |
842 | skb_trim(skb, els_len); | |
843 | fp = (struct fc_frame *)skb; | |
844 | fc_frame_init(fp); | |
845 | fr_sof(fp) = FC_SOF_I3; | |
846 | fr_eof(fp) = FC_EOF_T; | |
847 | fr_dev(fp) = lp; | |
848 | ||
849 | stats = fc_lport_get_stats(lp); | |
850 | stats->RxFrames++; | |
851 | stats->RxWords += skb->len / FIP_BPW; | |
852 | ||
853 | fc_exch_recv(lp, lp->emp, fp); | |
854 | return; | |
855 | ||
856 | len_err: | |
857 | FIP_DBG("FIP length error in descriptor type %x len %zu\n", | |
858 | desc->fip_dtype, dlen); | |
859 | drop: | |
860 | kfree_skb(skb); | |
861 | } | |
862 | ||
863 | /** | |
864 | * fcoe_ctlr_recv_els() - Handle an incoming link reset frame. | |
865 | * @fip: FCoE controller. | |
866 | * @fh: Received FIP header. | |
867 | * | |
868 | * There may be multiple VN_Port descriptors. | |
869 | * The overall length has already been checked. | |
870 | */ | |
871 | static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip, | |
872 | struct fip_header *fh) | |
873 | { | |
874 | struct fip_desc *desc; | |
875 | struct fip_mac_desc *mp; | |
876 | struct fip_wwn_desc *wp; | |
877 | struct fip_vn_desc *vp; | |
878 | size_t rlen; | |
879 | size_t dlen; | |
880 | struct fcoe_fcf *fcf = fip->sel_fcf; | |
881 | struct fc_lport *lp = fip->lp; | |
882 | u32 desc_mask; | |
883 | ||
884 | FIP_DBG("Clear Virtual Link received\n"); | |
885 | if (!fcf) | |
886 | return; | |
887 | if (!fcf || !fc_host_port_id(lp->host)) | |
888 | return; | |
889 | ||
890 | /* | |
891 | * mask of required descriptors. Validating each one clears its bit. | |
892 | */ | |
893 | desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | BIT(FIP_DT_VN_ID); | |
894 | ||
895 | rlen = ntohs(fh->fip_dl_len) * FIP_BPW; | |
896 | desc = (struct fip_desc *)(fh + 1); | |
897 | while (rlen >= sizeof(*desc)) { | |
898 | dlen = desc->fip_dlen * FIP_BPW; | |
899 | if (dlen > rlen) | |
900 | return; | |
901 | switch (desc->fip_dtype) { | |
902 | case FIP_DT_MAC: | |
903 | mp = (struct fip_mac_desc *)desc; | |
904 | if (dlen < sizeof(*mp)) | |
905 | return; | |
906 | if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac)) | |
907 | return; | |
908 | desc_mask &= ~BIT(FIP_DT_MAC); | |
909 | break; | |
910 | case FIP_DT_NAME: | |
911 | wp = (struct fip_wwn_desc *)desc; | |
912 | if (dlen < sizeof(*wp)) | |
913 | return; | |
914 | if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name) | |
915 | return; | |
916 | desc_mask &= ~BIT(FIP_DT_NAME); | |
917 | break; | |
918 | case FIP_DT_VN_ID: | |
919 | vp = (struct fip_vn_desc *)desc; | |
920 | if (dlen < sizeof(*vp)) | |
921 | return; | |
922 | if (compare_ether_addr(vp->fd_mac, | |
923 | fip->data_src_addr) == 0 && | |
924 | get_unaligned_be64(&vp->fd_wwpn) == lp->wwpn && | |
925 | ntoh24(vp->fd_fc_id) == fc_host_port_id(lp->host)) | |
926 | desc_mask &= ~BIT(FIP_DT_VN_ID); | |
927 | break; | |
928 | default: | |
929 | /* standard says ignore unknown descriptors >= 128 */ | |
930 | if (desc->fip_dtype < FIP_DT_VENDOR_BASE) | |
931 | return; | |
932 | break; | |
933 | } | |
934 | desc = (struct fip_desc *)((char *)desc + dlen); | |
935 | rlen -= dlen; | |
936 | } | |
937 | ||
938 | /* | |
939 | * reset only if all required descriptors were present and valid. | |
940 | */ | |
941 | if (desc_mask) { | |
942 | FIP_DBG("missing descriptors mask %x\n", desc_mask); | |
943 | } else { | |
944 | FIP_DBG("performing Clear Virtual Link\n"); | |
945 | fcoe_ctlr_reset(fip, FIP_ST_ENABLED); | |
946 | } | |
947 | } | |
948 | ||
949 | /** | |
950 | * fcoe_ctlr_recv() - Receive a FIP frame. | |
951 | * @fip: FCoE controller. | |
952 | * @skb: Received FIP packet. | |
953 | * | |
954 | * This is called from NET_RX_SOFTIRQ. | |
955 | */ | |
956 | void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
957 | { | |
958 | spin_lock_bh(&fip->fip_recv_list.lock); | |
959 | __skb_queue_tail(&fip->fip_recv_list, skb); | |
960 | spin_unlock_bh(&fip->fip_recv_list.lock); | |
961 | schedule_work(&fip->recv_work); | |
962 | } | |
963 | EXPORT_SYMBOL(fcoe_ctlr_recv); | |
964 | ||
965 | /** | |
966 | * fcoe_ctlr_recv_handler() - Receive a FIP frame. | |
967 | * @fip: FCoE controller. | |
968 | * @skb: Received FIP packet. | |
969 | * | |
970 | * Returns non-zero if the frame is dropped. | |
971 | */ | |
972 | static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
973 | { | |
974 | struct fip_header *fiph; | |
975 | struct ethhdr *eh; | |
976 | enum fip_state state; | |
977 | u16 op; | |
978 | u8 sub; | |
979 | ||
980 | if (skb_linearize(skb)) | |
981 | goto drop; | |
982 | if (skb->len < sizeof(*fiph)) | |
983 | goto drop; | |
984 | eh = eth_hdr(skb); | |
985 | if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) && | |
986 | compare_ether_addr(eh->h_dest, FIP_ALL_ENODE_MACS)) | |
987 | goto drop; | |
988 | fiph = (struct fip_header *)skb->data; | |
989 | op = ntohs(fiph->fip_op); | |
990 | sub = fiph->fip_subcode; | |
991 | ||
992 | FIP_DBG_LVL(2, "ver %x op %x/%x dl %x fl %x\n", | |
993 | FIP_VER_DECAPS(fiph->fip_ver), op, sub, | |
994 | ntohs(fiph->fip_dl_len), ntohs(fiph->fip_flags)); | |
995 | ||
996 | if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER) | |
997 | goto drop; | |
998 | if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len) | |
999 | goto drop; | |
1000 | ||
1001 | spin_lock_bh(&fip->lock); | |
1002 | state = fip->state; | |
1003 | if (state == FIP_ST_AUTO) { | |
1004 | fip->map_dest = 0; | |
1005 | fip->state = FIP_ST_ENABLED; | |
1006 | state = FIP_ST_ENABLED; | |
1007 | FIP_DBG("using FIP mode\n"); | |
1008 | } | |
1009 | spin_unlock_bh(&fip->lock); | |
1010 | if (state != FIP_ST_ENABLED) | |
1011 | goto drop; | |
1012 | ||
1013 | if (op == FIP_OP_LS) { | |
1014 | fcoe_ctlr_recv_els(fip, skb); /* consumes skb */ | |
1015 | return 0; | |
1016 | } | |
1017 | if (op == FIP_OP_DISC && sub == FIP_SC_ADV) | |
1018 | fcoe_ctlr_recv_adv(fip, skb); | |
1019 | else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) | |
1020 | fcoe_ctlr_recv_clr_vlink(fip, fiph); | |
1021 | kfree_skb(skb); | |
1022 | return 0; | |
1023 | drop: | |
1024 | kfree_skb(skb); | |
1025 | return -1; | |
1026 | } | |
1027 | ||
1028 | /** | |
1029 | * fcoe_ctlr_select() - Select the best FCF, if possible. | |
1030 | * @fip: FCoE controller. | |
1031 | * | |
1032 | * If there are conflicting advertisements, no FCF can be chosen. | |
1033 | * | |
1034 | * Called with lock held. | |
1035 | */ | |
1036 | static void fcoe_ctlr_select(struct fcoe_ctlr *fip) | |
1037 | { | |
1038 | struct fcoe_fcf *fcf; | |
1039 | struct fcoe_fcf *best = NULL; | |
1040 | ||
1041 | list_for_each_entry(fcf, &fip->fcfs, list) { | |
1042 | FIP_DBG("consider FCF for fab %llx VFID %d map %x val %d\n", | |
1043 | fcf->fabric_name, fcf->vfid, | |
1044 | fcf->fc_map, fcoe_ctlr_mtu_valid(fcf)); | |
1045 | if (!fcoe_ctlr_fcf_usable(fcf)) { | |
1046 | FIP_DBG("FCF for fab %llx map %x %svalid %savailable\n", | |
1047 | fcf->fabric_name, fcf->fc_map, | |
1048 | (fcf->flags & FIP_FL_SOL) ? "" : "in", | |
1049 | (fcf->flags & FIP_FL_AVAIL) ? "" : "un"); | |
1050 | continue; | |
1051 | } | |
1052 | if (!best) { | |
1053 | best = fcf; | |
1054 | continue; | |
1055 | } | |
1056 | if (fcf->fabric_name != best->fabric_name || | |
1057 | fcf->vfid != best->vfid || | |
1058 | fcf->fc_map != best->fc_map) { | |
1059 | FIP_DBG("conflicting fabric, VFID, or FC-MAP\n"); | |
1060 | return; | |
1061 | } | |
1062 | if (fcf->pri < best->pri) | |
1063 | best = fcf; | |
1064 | } | |
1065 | fip->sel_fcf = best; | |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * fcoe_ctlr_timeout() - FIP timer function. | |
1070 | * @arg: &fcoe_ctlr pointer. | |
1071 | * | |
1072 | * Ages FCFs. Triggers FCF selection if possible. Sends keep-alives. | |
1073 | */ | |
1074 | static void fcoe_ctlr_timeout(unsigned long arg) | |
1075 | { | |
1076 | struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg; | |
1077 | struct fcoe_fcf *sel; | |
1078 | struct fcoe_fcf *fcf; | |
1079 | unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD); | |
1080 | DECLARE_MAC_BUF(buf); | |
1081 | u8 send_ctlr_ka; | |
1082 | u8 send_port_ka; | |
1083 | ||
1084 | spin_lock_bh(&fip->lock); | |
1085 | if (fip->state == FIP_ST_DISABLED) { | |
1086 | spin_unlock_bh(&fip->lock); | |
1087 | return; | |
1088 | } | |
1089 | ||
1090 | fcf = fip->sel_fcf; | |
1091 | fcoe_ctlr_age_fcfs(fip); | |
1092 | ||
1093 | sel = fip->sel_fcf; | |
1094 | if (!sel && fip->sel_time && time_after_eq(jiffies, fip->sel_time)) { | |
1095 | fcoe_ctlr_select(fip); | |
1096 | sel = fip->sel_fcf; | |
1097 | fip->sel_time = 0; | |
1098 | } | |
1099 | ||
1100 | if (sel != fcf) { | |
1101 | fcf = sel; /* the old FCF may have been freed */ | |
1102 | if (sel) { | |
1103 | printk(KERN_INFO "host%d: FIP selected " | |
1104 | "Fibre-Channel Forwarder MAC %s\n", | |
1105 | fip->lp->host->host_no, | |
1106 | print_mac(buf, sel->fcf_mac)); | |
1107 | memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN); | |
1108 | fip->port_ka_time = jiffies + | |
1109 | msecs_to_jiffies(FIP_VN_KA_PERIOD); | |
1110 | fip->ctlr_ka_time = jiffies + sel->fka_period; | |
1111 | fip->link = 1; | |
1112 | } else { | |
1113 | printk(KERN_NOTICE "host%d: " | |
1114 | "FIP Fibre-Channel Forwarder timed out. " | |
1115 | "Starting FCF discovery.\n", | |
1116 | fip->lp->host->host_no); | |
1117 | fip->link = 0; | |
1118 | } | |
1119 | schedule_work(&fip->link_work); | |
1120 | } | |
1121 | ||
1122 | send_ctlr_ka = 0; | |
1123 | send_port_ka = 0; | |
1124 | if (sel) { | |
1125 | if (time_after_eq(jiffies, fip->ctlr_ka_time)) { | |
1126 | fip->ctlr_ka_time = jiffies + sel->fka_period; | |
1127 | send_ctlr_ka = 1; | |
1128 | } | |
1129 | if (time_after(next_timer, fip->ctlr_ka_time)) | |
1130 | next_timer = fip->ctlr_ka_time; | |
1131 | ||
1132 | if (time_after_eq(jiffies, fip->port_ka_time)) { | |
1133 | fip->port_ka_time += jiffies + | |
1134 | msecs_to_jiffies(FIP_VN_KA_PERIOD); | |
1135 | send_port_ka = 1; | |
1136 | } | |
1137 | if (time_after(next_timer, fip->port_ka_time)) | |
1138 | next_timer = fip->port_ka_time; | |
1139 | mod_timer(&fip->timer, next_timer); | |
1140 | } else if (fip->sel_time) { | |
1141 | next_timer = fip->sel_time + | |
1142 | msecs_to_jiffies(FCOE_CTLR_START_DELAY); | |
1143 | mod_timer(&fip->timer, next_timer); | |
1144 | } | |
1145 | spin_unlock_bh(&fip->lock); | |
1146 | ||
1147 | if (send_ctlr_ka) | |
1148 | fcoe_ctlr_send_keep_alive(fip, 0, fip->ctl_src_addr); | |
1149 | if (send_port_ka) | |
1150 | fcoe_ctlr_send_keep_alive(fip, 1, fip->data_src_addr); | |
1151 | } | |
1152 | ||
1153 | /** | |
1154 | * fcoe_ctlr_link_work() - worker thread function for link changes. | |
1155 | * @work: pointer to link_work member inside &fcoe_ctlr. | |
1156 | * | |
1157 | * See if the link status has changed and if so, report it. | |
1158 | * | |
1159 | * This is here because fc_linkup() and fc_linkdown() must not | |
1160 | * be called from the timer directly, since they use a mutex. | |
1161 | */ | |
1162 | static void fcoe_ctlr_link_work(struct work_struct *work) | |
1163 | { | |
1164 | struct fcoe_ctlr *fip; | |
1165 | int link; | |
1166 | int last_link; | |
1167 | ||
1168 | fip = container_of(work, struct fcoe_ctlr, link_work); | |
1169 | spin_lock_bh(&fip->lock); | |
1170 | last_link = fip->last_link; | |
1171 | link = fip->link; | |
1172 | fip->last_link = link; | |
1173 | spin_unlock_bh(&fip->lock); | |
1174 | ||
1175 | if (last_link != link) { | |
1176 | if (link) | |
1177 | fc_linkup(fip->lp); | |
1178 | else | |
1179 | fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT); | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | /** | |
1184 | * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames. | |
1185 | * @recv_work: pointer to recv_work member inside &fcoe_ctlr. | |
1186 | */ | |
1187 | static void fcoe_ctlr_recv_work(struct work_struct *recv_work) | |
1188 | { | |
1189 | struct fcoe_ctlr *fip; | |
1190 | struct sk_buff *skb; | |
1191 | ||
1192 | fip = container_of(recv_work, struct fcoe_ctlr, recv_work); | |
1193 | spin_lock_bh(&fip->fip_recv_list.lock); | |
1194 | while ((skb = __skb_dequeue(&fip->fip_recv_list))) { | |
1195 | spin_unlock_bh(&fip->fip_recv_list.lock); | |
1196 | fcoe_ctlr_recv_handler(fip, skb); | |
1197 | spin_lock_bh(&fip->fip_recv_list.lock); | |
1198 | } | |
1199 | spin_unlock_bh(&fip->fip_recv_list.lock); | |
1200 | } | |
1201 | ||
1202 | /** | |
1203 | * fcoe_ctlr_recv_flogi() - snoop Pre-FIP receipt of FLOGI response or request. | |
1204 | * @fip: FCoE controller. | |
1205 | * @fp: FC frame. | |
1206 | * @sa: Ethernet source MAC address from received FCoE frame. | |
1207 | * | |
1208 | * Snoop potential response to FLOGI or even incoming FLOGI. | |
1209 | * | |
1210 | * The caller has checked that we are waiting for login as indicated | |
1211 | * by fip->flogi_oxid != FC_XID_UNKNOWN. | |
1212 | * | |
1213 | * The caller is responsible for freeing the frame. | |
1214 | * | |
1215 | * Return non-zero if the frame should not be delivered to libfc. | |
1216 | */ | |
1217 | int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_frame *fp, u8 *sa) | |
1218 | { | |
1219 | struct fc_frame_header *fh; | |
1220 | u8 op; | |
1221 | u8 mac[ETH_ALEN]; | |
1222 | ||
1223 | fh = fc_frame_header_get(fp); | |
1224 | if (fh->fh_type != FC_TYPE_ELS) | |
1225 | return 0; | |
1226 | ||
1227 | op = fc_frame_payload_op(fp); | |
1228 | if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP && | |
1229 | fip->flogi_oxid == ntohs(fh->fh_ox_id)) { | |
1230 | ||
1231 | spin_lock_bh(&fip->lock); | |
1232 | if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) { | |
1233 | spin_unlock_bh(&fip->lock); | |
1234 | return -EINVAL; | |
1235 | } | |
1236 | fip->state = FIP_ST_NON_FIP; | |
1237 | FIP_DBG("received FLOGI LS_ACC using non-FIP mode\n"); | |
1238 | ||
1239 | /* | |
1240 | * FLOGI accepted. | |
1241 | * If the src mac addr is FC_OUI-based, then we mark the | |
1242 | * address_mode flag to use FC_OUI-based Ethernet DA. | |
1243 | * Otherwise we use the FCoE gateway addr | |
1244 | */ | |
1245 | if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) { | |
1246 | fip->map_dest = 1; | |
1247 | } else { | |
1248 | memcpy(fip->dest_addr, sa, ETH_ALEN); | |
1249 | fip->map_dest = 0; | |
1250 | } | |
1251 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
1252 | memcpy(mac, fip->data_src_addr, ETH_ALEN); | |
1253 | fc_fcoe_set_mac(fip->data_src_addr, fh->fh_d_id); | |
1254 | spin_unlock_bh(&fip->lock); | |
1255 | ||
1256 | fip->update_mac(fip, mac, fip->data_src_addr); | |
1257 | } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) { | |
1258 | /* | |
1259 | * Save source MAC for point-to-point responses. | |
1260 | */ | |
1261 | spin_lock_bh(&fip->lock); | |
1262 | if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) { | |
1263 | memcpy(fip->dest_addr, sa, ETH_ALEN); | |
1264 | fip->map_dest = 0; | |
1265 | if (fip->state == FIP_ST_NON_FIP) | |
1266 | FIP_DBG("received FLOGI REQ, " | |
1267 | "using non-FIP mode\n"); | |
1268 | fip->state = FIP_ST_NON_FIP; | |
1269 | } | |
1270 | spin_unlock_bh(&fip->lock); | |
1271 | } | |
1272 | return 0; | |
1273 | } | |
1274 | EXPORT_SYMBOL(fcoe_ctlr_recv_flogi); | |
1275 | ||
5e80f7f7 VD |
1276 | /** |
1277 | * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN. | |
1278 | * @mac: mac address | |
1279 | * @scheme: check port | |
1280 | * @port: port indicator for converting | |
1281 | * | |
1282 | * Returns: u64 fc world wide name | |
1283 | */ | |
1284 | u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN], | |
1285 | unsigned int scheme, unsigned int port) | |
1286 | { | |
1287 | u64 wwn; | |
1288 | u64 host_mac; | |
1289 | ||
1290 | /* The MAC is in NO, so flip only the low 48 bits */ | |
1291 | host_mac = ((u64) mac[0] << 40) | | |
1292 | ((u64) mac[1] << 32) | | |
1293 | ((u64) mac[2] << 24) | | |
1294 | ((u64) mac[3] << 16) | | |
1295 | ((u64) mac[4] << 8) | | |
1296 | (u64) mac[5]; | |
1297 | ||
1298 | WARN_ON(host_mac >= (1ULL << 48)); | |
1299 | wwn = host_mac | ((u64) scheme << 60); | |
1300 | switch (scheme) { | |
1301 | case 1: | |
1302 | WARN_ON(port != 0); | |
1303 | break; | |
1304 | case 2: | |
1305 | WARN_ON(port >= 0xfff); | |
1306 | wwn |= (u64) port << 48; | |
1307 | break; | |
1308 | default: | |
1309 | WARN_ON(1); | |
1310 | break; | |
1311 | } | |
1312 | ||
1313 | return wwn; | |
1314 | } | |
1315 | EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac); | |
1316 | ||
1317 | /** | |
1318 | * fcoe_libfc_config() - sets up libfc related properties for lport | |
1319 | * @lp: ptr to the fc_lport | |
1320 | * @tt: libfc function template | |
1321 | * | |
1322 | * Returns : 0 for success | |
1323 | */ | |
1324 | int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt) | |
1325 | { | |
1326 | /* Set the function pointers set by the LLDD */ | |
1327 | memcpy(&lp->tt, tt, sizeof(*tt)); | |
1328 | if (fc_fcp_init(lp)) | |
1329 | return -ENOMEM; | |
1330 | fc_exch_init(lp); | |
1331 | fc_elsct_init(lp); | |
1332 | fc_lport_init(lp); | |
1333 | fc_rport_init(lp); | |
1334 | fc_disc_init(lp); | |
1335 | ||
1336 | return 0; | |
1337 | } | |
1338 | EXPORT_SYMBOL_GPL(fcoe_libfc_config); |