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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 | ||
650bd12b RL |
59 | unsigned int libfcoe_debug_logging; |
60 | module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR); | |
61 | MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); | |
97c8389d | 62 | |
650bd12b RL |
63 | #define LIBFCOE_LOGGING 0x01 /* General logging, not categorized */ |
64 | #define LIBFCOE_FIP_LOGGING 0x02 /* FIP logging */ | |
65 | ||
66 | #define LIBFCOE_CHECK_LOGGING(LEVEL, CMD) \ | |
67 | do { \ | |
68 | if (unlikely(libfcoe_debug_logging & LEVEL)) \ | |
97c8389d | 69 | do { \ |
650bd12b RL |
70 | CMD; \ |
71 | } while (0); \ | |
72 | } while (0); | |
73 | ||
74 | #define LIBFCOE_DBG(fmt, args...) \ | |
75 | LIBFCOE_CHECK_LOGGING(LIBFCOE_LOGGING, \ | |
76 | printk(KERN_INFO "libfcoe: " fmt, ##args);) | |
97c8389d | 77 | |
650bd12b RL |
78 | #define LIBFCOE_FIP_DBG(fmt, args...) \ |
79 | LIBFCOE_CHECK_LOGGING(LIBFCOE_FIP_LOGGING, \ | |
80 | printk(KERN_INFO "fip: " fmt, ##args);) | |
97c8389d JE |
81 | |
82 | /* | |
83 | * Return non-zero if FCF fcoe_size has been validated. | |
84 | */ | |
85 | static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf) | |
86 | { | |
87 | return (fcf->flags & FIP_FL_SOL) != 0; | |
88 | } | |
89 | ||
90 | /* | |
91 | * Return non-zero if the FCF is usable. | |
92 | */ | |
93 | static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf) | |
94 | { | |
95 | u16 flags = FIP_FL_SOL | FIP_FL_AVAIL; | |
96 | ||
97 | return (fcf->flags & flags) == flags; | |
98 | } | |
99 | ||
100 | /** | |
101 | * fcoe_ctlr_init() - Initialize the FCoE Controller instance. | |
102 | * @fip: FCoE controller. | |
103 | */ | |
104 | void fcoe_ctlr_init(struct fcoe_ctlr *fip) | |
105 | { | |
106 | fip->state = FIP_ST_LINK_WAIT; | |
107 | INIT_LIST_HEAD(&fip->fcfs); | |
108 | spin_lock_init(&fip->lock); | |
109 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
110 | setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip); | |
111 | INIT_WORK(&fip->link_work, fcoe_ctlr_link_work); | |
112 | INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work); | |
113 | skb_queue_head_init(&fip->fip_recv_list); | |
114 | } | |
115 | EXPORT_SYMBOL(fcoe_ctlr_init); | |
116 | ||
117 | /** | |
118 | * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller. | |
119 | * @fip: FCoE controller. | |
120 | * | |
121 | * Called with &fcoe_ctlr lock held. | |
122 | */ | |
123 | static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip) | |
124 | { | |
125 | struct fcoe_fcf *fcf; | |
126 | struct fcoe_fcf *next; | |
127 | ||
128 | fip->sel_fcf = NULL; | |
129 | list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { | |
130 | list_del(&fcf->list); | |
131 | kfree(fcf); | |
132 | } | |
133 | fip->fcf_count = 0; | |
134 | fip->sel_time = 0; | |
135 | } | |
136 | ||
137 | /** | |
dd3fd72e | 138 | * fcoe_ctlr_destroy() - Disable and tear-down the FCoE controller. |
97c8389d JE |
139 | * @fip: FCoE controller. |
140 | * | |
141 | * This is called by FCoE drivers before freeing the &fcoe_ctlr. | |
142 | * | |
143 | * The receive handler will have been deleted before this to guarantee | |
144 | * that no more recv_work will be scheduled. | |
145 | * | |
146 | * The timer routine will simply return once we set FIP_ST_DISABLED. | |
147 | * This guarantees that no further timeouts or work will be scheduled. | |
148 | */ | |
149 | void fcoe_ctlr_destroy(struct fcoe_ctlr *fip) | |
150 | { | |
151 | flush_work(&fip->recv_work); | |
152 | spin_lock_bh(&fip->lock); | |
153 | fip->state = FIP_ST_DISABLED; | |
154 | fcoe_ctlr_reset_fcfs(fip); | |
155 | spin_unlock_bh(&fip->lock); | |
156 | del_timer_sync(&fip->timer); | |
157 | flush_work(&fip->link_work); | |
158 | } | |
159 | EXPORT_SYMBOL(fcoe_ctlr_destroy); | |
160 | ||
161 | /** | |
162 | * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port. | |
163 | * @fip: FCoE controller. | |
164 | * | |
165 | * Returns the maximum packet size including the FCoE header and trailer, | |
166 | * but not including any Ethernet or VLAN headers. | |
167 | */ | |
168 | static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip) | |
169 | { | |
170 | /* | |
171 | * Determine the max FCoE frame size allowed, including | |
172 | * FCoE header and trailer. | |
173 | * Note: lp->mfs is currently the payload size, not the frame size. | |
174 | */ | |
175 | return fip->lp->mfs + sizeof(struct fc_frame_header) + | |
176 | sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof); | |
177 | } | |
178 | ||
179 | /** | |
180 | * fcoe_ctlr_solicit() - Send a solicitation. | |
181 | * @fip: FCoE controller. | |
182 | * @fcf: Destination FCF. If NULL, a multicast solicitation is sent. | |
183 | */ | |
184 | static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf) | |
185 | { | |
186 | struct sk_buff *skb; | |
187 | struct fip_sol { | |
188 | struct ethhdr eth; | |
189 | struct fip_header fip; | |
190 | struct { | |
191 | struct fip_mac_desc mac; | |
192 | struct fip_wwn_desc wwnn; | |
193 | struct fip_size_desc size; | |
194 | } __attribute__((packed)) desc; | |
195 | } __attribute__((packed)) *sol; | |
196 | u32 fcoe_size; | |
197 | ||
198 | skb = dev_alloc_skb(sizeof(*sol)); | |
199 | if (!skb) | |
200 | return; | |
201 | ||
202 | sol = (struct fip_sol *)skb->data; | |
203 | ||
204 | memset(sol, 0, sizeof(*sol)); | |
205 | memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN); | |
206 | memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN); | |
207 | sol->eth.h_proto = htons(ETH_P_FIP); | |
208 | ||
209 | sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); | |
210 | sol->fip.fip_op = htons(FIP_OP_DISC); | |
211 | sol->fip.fip_subcode = FIP_SC_SOL; | |
212 | sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW); | |
213 | sol->fip.fip_flags = htons(FIP_FL_FPMA); | |
184dd345 VD |
214 | if (fip->spma) |
215 | sol->fip.fip_flags |= htons(FIP_FL_SPMA); | |
97c8389d JE |
216 | |
217 | sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC; | |
218 | sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW; | |
219 | memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); | |
220 | ||
221 | sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME; | |
222 | sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW; | |
223 | put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn); | |
224 | ||
225 | fcoe_size = fcoe_ctlr_fcoe_size(fip); | |
226 | sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE; | |
227 | sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW; | |
228 | sol->desc.size.fd_size = htons(fcoe_size); | |
229 | ||
230 | skb_put(skb, sizeof(*sol)); | |
0f491539 | 231 | skb->protocol = htons(ETH_P_FIP); |
97c8389d JE |
232 | skb_reset_mac_header(skb); |
233 | skb_reset_network_header(skb); | |
234 | fip->send(fip, skb); | |
235 | ||
236 | if (!fcf) | |
237 | fip->sol_time = jiffies; | |
238 | } | |
239 | ||
240 | /** | |
241 | * fcoe_ctlr_link_up() - Start FCoE controller. | |
242 | * @fip: FCoE controller. | |
243 | * | |
244 | * Called from the LLD when the network link is ready. | |
245 | */ | |
246 | void fcoe_ctlr_link_up(struct fcoe_ctlr *fip) | |
247 | { | |
248 | spin_lock_bh(&fip->lock); | |
249 | if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) { | |
250 | fip->last_link = 1; | |
251 | fip->link = 1; | |
252 | spin_unlock_bh(&fip->lock); | |
253 | fc_linkup(fip->lp); | |
254 | } else if (fip->state == FIP_ST_LINK_WAIT) { | |
255 | fip->state = FIP_ST_AUTO; | |
256 | fip->last_link = 1; | |
257 | fip->link = 1; | |
258 | spin_unlock_bh(&fip->lock); | |
650bd12b | 259 | LIBFCOE_FIP_DBG("%s", "setting AUTO mode.\n"); |
97c8389d JE |
260 | fc_linkup(fip->lp); |
261 | fcoe_ctlr_solicit(fip, NULL); | |
262 | } else | |
263 | spin_unlock_bh(&fip->lock); | |
264 | } | |
265 | EXPORT_SYMBOL(fcoe_ctlr_link_up); | |
266 | ||
267 | /** | |
268 | * fcoe_ctlr_reset() - Reset FIP. | |
269 | * @fip: FCoE controller. | |
270 | * @new_state: FIP state to be entered. | |
271 | * | |
272 | * Returns non-zero if the link was up and now isn't. | |
273 | */ | |
274 | static int fcoe_ctlr_reset(struct fcoe_ctlr *fip, enum fip_state new_state) | |
275 | { | |
276 | struct fc_lport *lp = fip->lp; | |
277 | int link_dropped; | |
278 | ||
279 | spin_lock_bh(&fip->lock); | |
280 | fcoe_ctlr_reset_fcfs(fip); | |
281 | del_timer(&fip->timer); | |
282 | fip->state = new_state; | |
283 | fip->ctlr_ka_time = 0; | |
284 | fip->port_ka_time = 0; | |
285 | fip->sol_time = 0; | |
286 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
287 | fip->map_dest = 0; | |
288 | fip->last_link = 0; | |
289 | link_dropped = fip->link; | |
290 | fip->link = 0; | |
291 | spin_unlock_bh(&fip->lock); | |
292 | ||
293 | if (link_dropped) | |
294 | fc_linkdown(lp); | |
295 | ||
296 | if (new_state == FIP_ST_ENABLED) { | |
297 | fcoe_ctlr_solicit(fip, NULL); | |
298 | fc_linkup(lp); | |
299 | link_dropped = 0; | |
300 | } | |
301 | return link_dropped; | |
302 | } | |
303 | ||
304 | /** | |
305 | * fcoe_ctlr_link_down() - Stop FCoE controller. | |
306 | * @fip: FCoE controller. | |
307 | * | |
308 | * Returns non-zero if the link was up and now isn't. | |
309 | * | |
310 | * Called from the LLD when the network link is not ready. | |
311 | * There may be multiple calls while the link is down. | |
312 | */ | |
313 | int fcoe_ctlr_link_down(struct fcoe_ctlr *fip) | |
314 | { | |
315 | return fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT); | |
316 | } | |
317 | EXPORT_SYMBOL(fcoe_ctlr_link_down); | |
318 | ||
319 | /** | |
320 | * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF. | |
321 | * @fip: FCoE controller. | |
322 | * @ports: 0 for controller keep-alive, 1 for port keep-alive. | |
323 | * @sa: source MAC address. | |
324 | * | |
325 | * A controller keep-alive is sent every fka_period (typically 8 seconds). | |
326 | * The source MAC is the native MAC address. | |
327 | * | |
328 | * A port keep-alive is sent every 90 seconds while logged in. | |
329 | * The source MAC is the assigned mapped source address. | |
330 | * The destination is the FCF's F-port. | |
331 | */ | |
332 | static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip, int ports, u8 *sa) | |
333 | { | |
334 | struct sk_buff *skb; | |
335 | struct fip_kal { | |
336 | struct ethhdr eth; | |
337 | struct fip_header fip; | |
338 | struct fip_mac_desc mac; | |
339 | } __attribute__((packed)) *kal; | |
340 | struct fip_vn_desc *vn; | |
341 | u32 len; | |
342 | struct fc_lport *lp; | |
343 | struct fcoe_fcf *fcf; | |
344 | ||
345 | fcf = fip->sel_fcf; | |
346 | lp = fip->lp; | |
347 | if (!fcf || !fc_host_port_id(lp->host)) | |
348 | return; | |
349 | ||
350 | len = fcoe_ctlr_fcoe_size(fip) + sizeof(struct ethhdr); | |
351 | BUG_ON(len < sizeof(*kal) + sizeof(*vn)); | |
352 | skb = dev_alloc_skb(len); | |
353 | if (!skb) | |
354 | return; | |
355 | ||
356 | kal = (struct fip_kal *)skb->data; | |
357 | memset(kal, 0, len); | |
358 | memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN); | |
359 | memcpy(kal->eth.h_source, sa, ETH_ALEN); | |
360 | kal->eth.h_proto = htons(ETH_P_FIP); | |
361 | ||
362 | kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); | |
363 | kal->fip.fip_op = htons(FIP_OP_CTRL); | |
364 | kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE; | |
365 | kal->fip.fip_dl_len = htons((sizeof(kal->mac) + | |
366 | ports * sizeof(*vn)) / FIP_BPW); | |
367 | kal->fip.fip_flags = htons(FIP_FL_FPMA); | |
184dd345 VD |
368 | if (fip->spma) |
369 | kal->fip.fip_flags |= htons(FIP_FL_SPMA); | |
97c8389d JE |
370 | |
371 | kal->mac.fd_desc.fip_dtype = FIP_DT_MAC; | |
372 | kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW; | |
373 | memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); | |
374 | ||
375 | if (ports) { | |
376 | vn = (struct fip_vn_desc *)(kal + 1); | |
377 | vn->fd_desc.fip_dtype = FIP_DT_VN_ID; | |
378 | vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW; | |
379 | memcpy(vn->fd_mac, fip->data_src_addr, ETH_ALEN); | |
380 | hton24(vn->fd_fc_id, fc_host_port_id(lp->host)); | |
381 | put_unaligned_be64(lp->wwpn, &vn->fd_wwpn); | |
382 | } | |
383 | ||
384 | skb_put(skb, len); | |
0f491539 | 385 | skb->protocol = htons(ETH_P_FIP); |
97c8389d JE |
386 | skb_reset_mac_header(skb); |
387 | skb_reset_network_header(skb); | |
388 | fip->send(fip, skb); | |
389 | } | |
390 | ||
391 | /** | |
392 | * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it. | |
393 | * @fip: FCoE controller. | |
394 | * @dtype: FIP descriptor type for the frame. | |
395 | * @skb: FCoE ELS frame including FC header but no FCoE headers. | |
396 | * | |
397 | * Returns non-zero error code on failure. | |
398 | * | |
399 | * The caller must check that the length is a multiple of 4. | |
400 | * | |
401 | * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes). | |
402 | * Headroom includes the FIP encapsulation description, FIP header, and | |
403 | * Ethernet header. The tailroom is for the FIP MAC descriptor. | |
404 | */ | |
405 | static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, | |
406 | u8 dtype, struct sk_buff *skb) | |
407 | { | |
408 | struct fip_encaps_head { | |
409 | struct ethhdr eth; | |
410 | struct fip_header fip; | |
411 | struct fip_encaps encaps; | |
412 | } __attribute__((packed)) *cap; | |
413 | struct fip_mac_desc *mac; | |
414 | struct fcoe_fcf *fcf; | |
415 | size_t dlen; | |
5a84baea | 416 | u16 fip_flags; |
97c8389d JE |
417 | |
418 | fcf = fip->sel_fcf; | |
419 | if (!fcf) | |
420 | return -ENODEV; | |
5a84baea YZ |
421 | |
422 | /* set flags according to both FCF and lport's capability on SPMA */ | |
423 | fip_flags = fcf->flags; | |
424 | fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA : FIP_FL_FPMA; | |
425 | if (!fip_flags) | |
426 | return -ENODEV; | |
427 | ||
97c8389d JE |
428 | dlen = sizeof(struct fip_encaps) + skb->len; /* len before push */ |
429 | cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap)); | |
430 | ||
431 | memset(cap, 0, sizeof(*cap)); | |
432 | memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN); | |
433 | memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN); | |
434 | cap->eth.h_proto = htons(ETH_P_FIP); | |
435 | ||
436 | cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); | |
437 | cap->fip.fip_op = htons(FIP_OP_LS); | |
438 | cap->fip.fip_subcode = FIP_SC_REQ; | |
439 | cap->fip.fip_dl_len = htons((dlen + sizeof(*mac)) / FIP_BPW); | |
5a84baea | 440 | cap->fip.fip_flags = htons(fip_flags); |
97c8389d JE |
441 | |
442 | cap->encaps.fd_desc.fip_dtype = dtype; | |
443 | cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW; | |
444 | ||
445 | mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac)); | |
446 | memset(mac, 0, sizeof(mac)); | |
447 | mac->fd_desc.fip_dtype = FIP_DT_MAC; | |
448 | mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW; | |
184dd345 | 449 | if (dtype != FIP_DT_FLOGI) |
97c8389d | 450 | memcpy(mac->fd_mac, fip->data_src_addr, ETH_ALEN); |
184dd345 VD |
451 | else if (fip->spma) |
452 | memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN); | |
97c8389d | 453 | |
0f491539 | 454 | skb->protocol = htons(ETH_P_FIP); |
97c8389d JE |
455 | skb_reset_mac_header(skb); |
456 | skb_reset_network_header(skb); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | /** | |
461 | * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate. | |
462 | * @fip: FCoE controller. | |
463 | * @skb: FCoE ELS frame including FC header but no FCoE headers. | |
464 | * | |
465 | * Returns a non-zero error code if the frame should not be sent. | |
466 | * Returns zero if the caller should send the frame with FCoE encapsulation. | |
467 | * | |
468 | * The caller must check that the length is a multiple of 4. | |
469 | * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes). | |
470 | */ | |
471 | int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
472 | { | |
473 | struct fc_frame_header *fh; | |
474 | u16 old_xid; | |
475 | u8 op; | |
476 | ||
97c8389d JE |
477 | fh = (struct fc_frame_header *)skb->data; |
478 | op = *(u8 *)(fh + 1); | |
479 | ||
5f48f70e | 480 | if (op == ELS_FLOGI) { |
97c8389d JE |
481 | old_xid = fip->flogi_oxid; |
482 | fip->flogi_oxid = ntohs(fh->fh_ox_id); | |
483 | if (fip->state == FIP_ST_AUTO) { | |
484 | if (old_xid == FC_XID_UNKNOWN) | |
485 | fip->flogi_count = 0; | |
486 | fip->flogi_count++; | |
487 | if (fip->flogi_count < 3) | |
488 | goto drop; | |
489 | fip->map_dest = 1; | |
490 | return 0; | |
491 | } | |
5f48f70e JE |
492 | if (fip->state == FIP_ST_NON_FIP) |
493 | fip->map_dest = 1; | |
494 | } | |
495 | ||
496 | if (fip->state == FIP_ST_NON_FIP) | |
497 | return 0; | |
498 | ||
499 | switch (op) { | |
500 | case ELS_FLOGI: | |
97c8389d JE |
501 | op = FIP_DT_FLOGI; |
502 | break; | |
503 | case ELS_FDISC: | |
504 | if (ntoh24(fh->fh_s_id)) | |
505 | return 0; | |
506 | op = FIP_DT_FDISC; | |
507 | break; | |
508 | case ELS_LOGO: | |
509 | if (fip->state != FIP_ST_ENABLED) | |
510 | return 0; | |
511 | if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) | |
512 | return 0; | |
513 | op = FIP_DT_LOGO; | |
514 | break; | |
515 | case ELS_LS_ACC: | |
516 | if (fip->flogi_oxid == FC_XID_UNKNOWN) | |
517 | return 0; | |
518 | if (!ntoh24(fh->fh_s_id)) | |
519 | return 0; | |
520 | if (fip->state == FIP_ST_AUTO) | |
521 | return 0; | |
522 | /* | |
523 | * Here we must've gotten an SID by accepting an FLOGI | |
524 | * from a point-to-point connection. Switch to using | |
525 | * the source mac based on the SID. The destination | |
526 | * MAC in this case would have been set by receving the | |
527 | * FLOGI. | |
528 | */ | |
529 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
530 | fc_fcoe_set_mac(fip->data_src_addr, fh->fh_s_id); | |
531 | return 0; | |
532 | default: | |
533 | if (fip->state != FIP_ST_ENABLED) | |
534 | goto drop; | |
535 | return 0; | |
536 | } | |
537 | if (fcoe_ctlr_encaps(fip, op, skb)) | |
538 | goto drop; | |
539 | fip->send(fip, skb); | |
540 | return -EINPROGRESS; | |
541 | drop: | |
542 | kfree_skb(skb); | |
543 | return -EINVAL; | |
544 | } | |
545 | EXPORT_SYMBOL(fcoe_ctlr_els_send); | |
546 | ||
547 | /* | |
548 | * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller. | |
549 | * @fip: FCoE controller. | |
550 | * | |
551 | * Called with lock held. | |
552 | * | |
553 | * An FCF is considered old if we have missed three advertisements. | |
554 | * That is, there have been no valid advertisement from it for three | |
555 | * times its keep-alive period including fuzz. | |
556 | * | |
557 | * In addition, determine the time when an FCF selection can occur. | |
558 | */ | |
559 | static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip) | |
560 | { | |
561 | struct fcoe_fcf *fcf; | |
562 | struct fcoe_fcf *next; | |
563 | unsigned long sel_time = 0; | |
564 | ||
565 | list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { | |
566 | if (time_after(jiffies, fcf->time + fcf->fka_period * 3 + | |
567 | msecs_to_jiffies(FIP_FCF_FUZZ * 3))) { | |
568 | if (fip->sel_fcf == fcf) | |
569 | fip->sel_fcf = NULL; | |
570 | list_del(&fcf->list); | |
571 | WARN_ON(!fip->fcf_count); | |
572 | fip->fcf_count--; | |
573 | kfree(fcf); | |
574 | } else if (fcoe_ctlr_mtu_valid(fcf) && | |
575 | (!sel_time || time_before(sel_time, fcf->time))) { | |
576 | sel_time = fcf->time; | |
577 | } | |
578 | } | |
579 | if (sel_time) { | |
580 | sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY); | |
581 | fip->sel_time = sel_time; | |
582 | if (time_before(sel_time, fip->timer.expires)) | |
583 | mod_timer(&fip->timer, sel_time); | |
584 | } else { | |
585 | fip->sel_time = 0; | |
586 | } | |
587 | } | |
588 | ||
589 | /** | |
590 | * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry. | |
591 | * @skb: received FIP advertisement frame | |
592 | * @fcf: resulting FCF entry. | |
593 | * | |
594 | * Returns zero on a valid parsed advertisement, | |
595 | * otherwise returns non zero value. | |
596 | */ | |
597 | static int fcoe_ctlr_parse_adv(struct sk_buff *skb, struct fcoe_fcf *fcf) | |
598 | { | |
599 | struct fip_header *fiph; | |
600 | struct fip_desc *desc = NULL; | |
601 | struct fip_wwn_desc *wwn; | |
602 | struct fip_fab_desc *fab; | |
603 | struct fip_fka_desc *fka; | |
604 | unsigned long t; | |
605 | size_t rlen; | |
606 | size_t dlen; | |
607 | ||
608 | memset(fcf, 0, sizeof(*fcf)); | |
609 | fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA); | |
610 | ||
611 | fiph = (struct fip_header *)skb->data; | |
612 | fcf->flags = ntohs(fiph->fip_flags); | |
613 | ||
614 | rlen = ntohs(fiph->fip_dl_len) * 4; | |
615 | if (rlen + sizeof(*fiph) > skb->len) | |
616 | return -EINVAL; | |
617 | ||
618 | desc = (struct fip_desc *)(fiph + 1); | |
619 | while (rlen > 0) { | |
620 | dlen = desc->fip_dlen * FIP_BPW; | |
621 | if (dlen < sizeof(*desc) || dlen > rlen) | |
622 | return -EINVAL; | |
623 | switch (desc->fip_dtype) { | |
624 | case FIP_DT_PRI: | |
625 | if (dlen != sizeof(struct fip_pri_desc)) | |
626 | goto len_err; | |
627 | fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri; | |
628 | break; | |
629 | case FIP_DT_MAC: | |
630 | if (dlen != sizeof(struct fip_mac_desc)) | |
631 | goto len_err; | |
632 | memcpy(fcf->fcf_mac, | |
633 | ((struct fip_mac_desc *)desc)->fd_mac, | |
634 | ETH_ALEN); | |
635 | if (!is_valid_ether_addr(fcf->fcf_mac)) { | |
650bd12b RL |
636 | LIBFCOE_FIP_DBG("Invalid MAC address " |
637 | "in FIP adv\n"); | |
97c8389d JE |
638 | return -EINVAL; |
639 | } | |
640 | break; | |
641 | case FIP_DT_NAME: | |
642 | if (dlen != sizeof(struct fip_wwn_desc)) | |
643 | goto len_err; | |
644 | wwn = (struct fip_wwn_desc *)desc; | |
645 | fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn); | |
646 | break; | |
647 | case FIP_DT_FAB: | |
648 | if (dlen != sizeof(struct fip_fab_desc)) | |
649 | goto len_err; | |
650 | fab = (struct fip_fab_desc *)desc; | |
651 | fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn); | |
652 | fcf->vfid = ntohs(fab->fd_vfid); | |
653 | fcf->fc_map = ntoh24(fab->fd_map); | |
654 | break; | |
655 | case FIP_DT_FKA: | |
656 | if (dlen != sizeof(struct fip_fka_desc)) | |
657 | goto len_err; | |
658 | fka = (struct fip_fka_desc *)desc; | |
659 | t = ntohl(fka->fd_fka_period); | |
660 | if (t >= FCOE_CTLR_MIN_FKA) | |
661 | fcf->fka_period = msecs_to_jiffies(t); | |
662 | break; | |
663 | case FIP_DT_MAP_OUI: | |
664 | case FIP_DT_FCOE_SIZE: | |
665 | case FIP_DT_FLOGI: | |
666 | case FIP_DT_FDISC: | |
667 | case FIP_DT_LOGO: | |
668 | case FIP_DT_ELP: | |
669 | default: | |
650bd12b RL |
670 | LIBFCOE_FIP_DBG("unexpected descriptor type %x " |
671 | "in FIP adv\n", desc->fip_dtype); | |
97c8389d JE |
672 | /* standard says ignore unknown descriptors >= 128 */ |
673 | if (desc->fip_dtype < FIP_DT_VENDOR_BASE) | |
674 | return -EINVAL; | |
675 | continue; | |
676 | } | |
677 | desc = (struct fip_desc *)((char *)desc + dlen); | |
678 | rlen -= dlen; | |
679 | } | |
680 | if (!fcf->fc_map || (fcf->fc_map & 0x10000)) | |
681 | return -EINVAL; | |
682 | if (!fcf->switch_name || !fcf->fabric_name) | |
683 | return -EINVAL; | |
684 | return 0; | |
685 | ||
686 | len_err: | |
650bd12b RL |
687 | LIBFCOE_FIP_DBG("FIP length error in descriptor type %x len %zu\n", |
688 | desc->fip_dtype, dlen); | |
97c8389d JE |
689 | return -EINVAL; |
690 | } | |
691 | ||
692 | /** | |
693 | * fcoe_ctlr_recv_adv() - Handle an incoming advertisement. | |
694 | * @fip: FCoE controller. | |
695 | * @skb: Received FIP packet. | |
696 | */ | |
697 | static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
698 | { | |
699 | struct fcoe_fcf *fcf; | |
700 | struct fcoe_fcf new; | |
701 | struct fcoe_fcf *found; | |
702 | unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV); | |
703 | int first = 0; | |
704 | int mtu_valid; | |
705 | ||
706 | if (fcoe_ctlr_parse_adv(skb, &new)) | |
707 | return; | |
708 | ||
709 | spin_lock_bh(&fip->lock); | |
710 | first = list_empty(&fip->fcfs); | |
711 | found = NULL; | |
712 | list_for_each_entry(fcf, &fip->fcfs, list) { | |
713 | if (fcf->switch_name == new.switch_name && | |
714 | fcf->fabric_name == new.fabric_name && | |
715 | fcf->fc_map == new.fc_map && | |
716 | compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) { | |
717 | found = fcf; | |
718 | break; | |
719 | } | |
720 | } | |
721 | if (!found) { | |
722 | if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT) | |
723 | goto out; | |
724 | ||
725 | fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC); | |
726 | if (!fcf) | |
727 | goto out; | |
728 | ||
729 | fip->fcf_count++; | |
730 | memcpy(fcf, &new, sizeof(new)); | |
731 | list_add(&fcf->list, &fip->fcfs); | |
732 | } else { | |
733 | /* | |
734 | * Flags in advertisements are ignored once the FCF is | |
735 | * selected. Flags in unsolicited advertisements are | |
736 | * ignored after a usable solicited advertisement | |
737 | * has been received. | |
738 | */ | |
739 | if (fcf == fip->sel_fcf) { | |
740 | fip->ctlr_ka_time -= fcf->fka_period; | |
741 | fip->ctlr_ka_time += new.fka_period; | |
742 | if (time_before(fip->ctlr_ka_time, fip->timer.expires)) | |
743 | mod_timer(&fip->timer, fip->ctlr_ka_time); | |
744 | } else if (!fcoe_ctlr_fcf_usable(fcf)) | |
745 | fcf->flags = new.flags; | |
746 | fcf->fka_period = new.fka_period; | |
747 | memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN); | |
748 | } | |
749 | mtu_valid = fcoe_ctlr_mtu_valid(fcf); | |
750 | fcf->time = jiffies; | |
650bd12b RL |
751 | if (!found) { |
752 | LIBFCOE_FIP_DBG("New FCF for fab %llx map %x val %d\n", | |
753 | fcf->fabric_name, fcf->fc_map, mtu_valid); | |
754 | } | |
97c8389d JE |
755 | |
756 | /* | |
757 | * If this advertisement is not solicited and our max receive size | |
758 | * hasn't been verified, send a solicited advertisement. | |
759 | */ | |
760 | if (!mtu_valid) | |
761 | fcoe_ctlr_solicit(fip, fcf); | |
762 | ||
763 | /* | |
764 | * If its been a while since we did a solicit, and this is | |
765 | * the first advertisement we've received, do a multicast | |
766 | * solicitation to gather as many advertisements as we can | |
767 | * before selection occurs. | |
768 | */ | |
769 | if (first && time_after(jiffies, fip->sol_time + sol_tov)) | |
770 | fcoe_ctlr_solicit(fip, NULL); | |
771 | ||
772 | /* | |
773 | * If this is the first validated FCF, note the time and | |
774 | * set a timer to trigger selection. | |
775 | */ | |
776 | if (mtu_valid && !fip->sel_time && fcoe_ctlr_fcf_usable(fcf)) { | |
777 | fip->sel_time = jiffies + | |
778 | msecs_to_jiffies(FCOE_CTLR_START_DELAY); | |
779 | if (!timer_pending(&fip->timer) || | |
780 | time_before(fip->sel_time, fip->timer.expires)) | |
781 | mod_timer(&fip->timer, fip->sel_time); | |
782 | } | |
783 | out: | |
784 | spin_unlock_bh(&fip->lock); | |
785 | } | |
786 | ||
787 | /** | |
788 | * fcoe_ctlr_recv_els() - Handle an incoming FIP-encapsulated ELS frame. | |
789 | * @fip: FCoE controller. | |
790 | * @skb: Received FIP packet. | |
791 | */ | |
792 | static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
793 | { | |
794 | struct fc_lport *lp = fip->lp; | |
795 | struct fip_header *fiph; | |
796 | struct fc_frame *fp; | |
797 | struct fc_frame_header *fh = NULL; | |
798 | struct fip_desc *desc; | |
799 | struct fip_encaps *els; | |
800 | struct fcoe_dev_stats *stats; | |
801 | enum fip_desc_type els_dtype = 0; | |
802 | u8 els_op; | |
803 | u8 sub; | |
804 | u8 granted_mac[ETH_ALEN] = { 0 }; | |
805 | size_t els_len = 0; | |
806 | size_t rlen; | |
807 | size_t dlen; | |
808 | ||
809 | fiph = (struct fip_header *)skb->data; | |
810 | sub = fiph->fip_subcode; | |
811 | if (sub != FIP_SC_REQ && sub != FIP_SC_REP) | |
812 | goto drop; | |
813 | ||
814 | rlen = ntohs(fiph->fip_dl_len) * 4; | |
815 | if (rlen + sizeof(*fiph) > skb->len) | |
816 | goto drop; | |
817 | ||
818 | desc = (struct fip_desc *)(fiph + 1); | |
819 | while (rlen > 0) { | |
820 | dlen = desc->fip_dlen * FIP_BPW; | |
821 | if (dlen < sizeof(*desc) || dlen > rlen) | |
822 | goto drop; | |
823 | switch (desc->fip_dtype) { | |
824 | case FIP_DT_MAC: | |
825 | if (dlen != sizeof(struct fip_mac_desc)) | |
826 | goto len_err; | |
827 | memcpy(granted_mac, | |
828 | ((struct fip_mac_desc *)desc)->fd_mac, | |
829 | ETH_ALEN); | |
830 | if (!is_valid_ether_addr(granted_mac)) { | |
650bd12b RL |
831 | LIBFCOE_FIP_DBG("Invalid MAC address " |
832 | "in FIP ELS\n"); | |
97c8389d JE |
833 | goto drop; |
834 | } | |
835 | break; | |
836 | case FIP_DT_FLOGI: | |
837 | case FIP_DT_FDISC: | |
838 | case FIP_DT_LOGO: | |
839 | case FIP_DT_ELP: | |
840 | if (fh) | |
841 | goto drop; | |
842 | if (dlen < sizeof(*els) + sizeof(*fh) + 1) | |
843 | goto len_err; | |
844 | els_len = dlen - sizeof(*els); | |
845 | els = (struct fip_encaps *)desc; | |
846 | fh = (struct fc_frame_header *)(els + 1); | |
847 | els_dtype = desc->fip_dtype; | |
848 | break; | |
849 | default: | |
650bd12b RL |
850 | LIBFCOE_FIP_DBG("unexpected descriptor type %x " |
851 | "in FIP adv\n", desc->fip_dtype); | |
97c8389d JE |
852 | /* standard says ignore unknown descriptors >= 128 */ |
853 | if (desc->fip_dtype < FIP_DT_VENDOR_BASE) | |
854 | goto drop; | |
855 | continue; | |
856 | } | |
857 | desc = (struct fip_desc *)((char *)desc + dlen); | |
858 | rlen -= dlen; | |
859 | } | |
860 | ||
861 | if (!fh) | |
862 | goto drop; | |
863 | els_op = *(u8 *)(fh + 1); | |
864 | ||
865 | if (els_dtype == FIP_DT_FLOGI && sub == FIP_SC_REP && | |
866 | fip->flogi_oxid == ntohs(fh->fh_ox_id) && | |
867 | els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac)) { | |
868 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
869 | fip->update_mac(fip, fip->data_src_addr, granted_mac); | |
870 | memcpy(fip->data_src_addr, granted_mac, ETH_ALEN); | |
871 | } | |
872 | ||
873 | /* | |
874 | * Convert skb into an fc_frame containing only the ELS. | |
875 | */ | |
876 | skb_pull(skb, (u8 *)fh - skb->data); | |
877 | skb_trim(skb, els_len); | |
878 | fp = (struct fc_frame *)skb; | |
879 | fc_frame_init(fp); | |
880 | fr_sof(fp) = FC_SOF_I3; | |
881 | fr_eof(fp) = FC_EOF_T; | |
882 | fr_dev(fp) = lp; | |
883 | ||
884 | stats = fc_lport_get_stats(lp); | |
885 | stats->RxFrames++; | |
886 | stats->RxWords += skb->len / FIP_BPW; | |
887 | ||
888 | fc_exch_recv(lp, lp->emp, fp); | |
889 | return; | |
890 | ||
891 | len_err: | |
650bd12b RL |
892 | LIBFCOE_FIP_DBG("FIP length error in descriptor type %x len %zu\n", |
893 | desc->fip_dtype, dlen); | |
97c8389d JE |
894 | drop: |
895 | kfree_skb(skb); | |
896 | } | |
897 | ||
898 | /** | |
899 | * fcoe_ctlr_recv_els() - Handle an incoming link reset frame. | |
900 | * @fip: FCoE controller. | |
901 | * @fh: Received FIP header. | |
902 | * | |
903 | * There may be multiple VN_Port descriptors. | |
904 | * The overall length has already been checked. | |
905 | */ | |
906 | static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip, | |
907 | struct fip_header *fh) | |
908 | { | |
909 | struct fip_desc *desc; | |
910 | struct fip_mac_desc *mp; | |
911 | struct fip_wwn_desc *wp; | |
912 | struct fip_vn_desc *vp; | |
913 | size_t rlen; | |
914 | size_t dlen; | |
915 | struct fcoe_fcf *fcf = fip->sel_fcf; | |
916 | struct fc_lport *lp = fip->lp; | |
917 | u32 desc_mask; | |
918 | ||
650bd12b | 919 | LIBFCOE_FIP_DBG("Clear Virtual Link received\n"); |
97c8389d JE |
920 | if (!fcf) |
921 | return; | |
922 | if (!fcf || !fc_host_port_id(lp->host)) | |
923 | return; | |
924 | ||
925 | /* | |
926 | * mask of required descriptors. Validating each one clears its bit. | |
927 | */ | |
928 | desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | BIT(FIP_DT_VN_ID); | |
929 | ||
930 | rlen = ntohs(fh->fip_dl_len) * FIP_BPW; | |
931 | desc = (struct fip_desc *)(fh + 1); | |
932 | while (rlen >= sizeof(*desc)) { | |
933 | dlen = desc->fip_dlen * FIP_BPW; | |
934 | if (dlen > rlen) | |
935 | return; | |
936 | switch (desc->fip_dtype) { | |
937 | case FIP_DT_MAC: | |
938 | mp = (struct fip_mac_desc *)desc; | |
939 | if (dlen < sizeof(*mp)) | |
940 | return; | |
941 | if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac)) | |
942 | return; | |
943 | desc_mask &= ~BIT(FIP_DT_MAC); | |
944 | break; | |
945 | case FIP_DT_NAME: | |
946 | wp = (struct fip_wwn_desc *)desc; | |
947 | if (dlen < sizeof(*wp)) | |
948 | return; | |
949 | if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name) | |
950 | return; | |
951 | desc_mask &= ~BIT(FIP_DT_NAME); | |
952 | break; | |
953 | case FIP_DT_VN_ID: | |
954 | vp = (struct fip_vn_desc *)desc; | |
955 | if (dlen < sizeof(*vp)) | |
956 | return; | |
957 | if (compare_ether_addr(vp->fd_mac, | |
958 | fip->data_src_addr) == 0 && | |
959 | get_unaligned_be64(&vp->fd_wwpn) == lp->wwpn && | |
960 | ntoh24(vp->fd_fc_id) == fc_host_port_id(lp->host)) | |
961 | desc_mask &= ~BIT(FIP_DT_VN_ID); | |
962 | break; | |
963 | default: | |
964 | /* standard says ignore unknown descriptors >= 128 */ | |
965 | if (desc->fip_dtype < FIP_DT_VENDOR_BASE) | |
966 | return; | |
967 | break; | |
968 | } | |
969 | desc = (struct fip_desc *)((char *)desc + dlen); | |
970 | rlen -= dlen; | |
971 | } | |
972 | ||
973 | /* | |
974 | * reset only if all required descriptors were present and valid. | |
975 | */ | |
976 | if (desc_mask) { | |
650bd12b | 977 | LIBFCOE_FIP_DBG("missing descriptors mask %x\n", desc_mask); |
97c8389d | 978 | } else { |
650bd12b | 979 | LIBFCOE_FIP_DBG("performing Clear Virtual Link\n"); |
97c8389d JE |
980 | fcoe_ctlr_reset(fip, FIP_ST_ENABLED); |
981 | } | |
982 | } | |
983 | ||
984 | /** | |
985 | * fcoe_ctlr_recv() - Receive a FIP frame. | |
986 | * @fip: FCoE controller. | |
987 | * @skb: Received FIP packet. | |
988 | * | |
989 | * This is called from NET_RX_SOFTIRQ. | |
990 | */ | |
991 | void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
992 | { | |
993 | spin_lock_bh(&fip->fip_recv_list.lock); | |
994 | __skb_queue_tail(&fip->fip_recv_list, skb); | |
995 | spin_unlock_bh(&fip->fip_recv_list.lock); | |
996 | schedule_work(&fip->recv_work); | |
997 | } | |
998 | EXPORT_SYMBOL(fcoe_ctlr_recv); | |
999 | ||
1000 | /** | |
1001 | * fcoe_ctlr_recv_handler() - Receive a FIP frame. | |
1002 | * @fip: FCoE controller. | |
1003 | * @skb: Received FIP packet. | |
1004 | * | |
1005 | * Returns non-zero if the frame is dropped. | |
1006 | */ | |
1007 | static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
1008 | { | |
1009 | struct fip_header *fiph; | |
1010 | struct ethhdr *eh; | |
1011 | enum fip_state state; | |
1012 | u16 op; | |
1013 | u8 sub; | |
1014 | ||
1015 | if (skb_linearize(skb)) | |
1016 | goto drop; | |
1017 | if (skb->len < sizeof(*fiph)) | |
1018 | goto drop; | |
1019 | eh = eth_hdr(skb); | |
1020 | if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) && | |
1021 | compare_ether_addr(eh->h_dest, FIP_ALL_ENODE_MACS)) | |
1022 | goto drop; | |
1023 | fiph = (struct fip_header *)skb->data; | |
1024 | op = ntohs(fiph->fip_op); | |
1025 | sub = fiph->fip_subcode; | |
1026 | ||
97c8389d JE |
1027 | if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER) |
1028 | goto drop; | |
1029 | if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len) | |
1030 | goto drop; | |
1031 | ||
1032 | spin_lock_bh(&fip->lock); | |
1033 | state = fip->state; | |
1034 | if (state == FIP_ST_AUTO) { | |
1035 | fip->map_dest = 0; | |
1036 | fip->state = FIP_ST_ENABLED; | |
1037 | state = FIP_ST_ENABLED; | |
650bd12b | 1038 | LIBFCOE_FIP_DBG("Using FIP mode\n"); |
97c8389d JE |
1039 | } |
1040 | spin_unlock_bh(&fip->lock); | |
1041 | if (state != FIP_ST_ENABLED) | |
1042 | goto drop; | |
1043 | ||
1044 | if (op == FIP_OP_LS) { | |
1045 | fcoe_ctlr_recv_els(fip, skb); /* consumes skb */ | |
1046 | return 0; | |
1047 | } | |
1048 | if (op == FIP_OP_DISC && sub == FIP_SC_ADV) | |
1049 | fcoe_ctlr_recv_adv(fip, skb); | |
1050 | else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) | |
1051 | fcoe_ctlr_recv_clr_vlink(fip, fiph); | |
1052 | kfree_skb(skb); | |
1053 | return 0; | |
1054 | drop: | |
1055 | kfree_skb(skb); | |
1056 | return -1; | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * fcoe_ctlr_select() - Select the best FCF, if possible. | |
1061 | * @fip: FCoE controller. | |
1062 | * | |
1063 | * If there are conflicting advertisements, no FCF can be chosen. | |
1064 | * | |
1065 | * Called with lock held. | |
1066 | */ | |
1067 | static void fcoe_ctlr_select(struct fcoe_ctlr *fip) | |
1068 | { | |
1069 | struct fcoe_fcf *fcf; | |
1070 | struct fcoe_fcf *best = NULL; | |
1071 | ||
1072 | list_for_each_entry(fcf, &fip->fcfs, list) { | |
650bd12b RL |
1073 | LIBFCOE_FIP_DBG("consider FCF for fab %llx VFID %d map %x " |
1074 | "val %d\n", fcf->fabric_name, fcf->vfid, | |
1075 | fcf->fc_map, fcoe_ctlr_mtu_valid(fcf)); | |
97c8389d | 1076 | if (!fcoe_ctlr_fcf_usable(fcf)) { |
650bd12b RL |
1077 | LIBFCOE_FIP_DBG("FCF for fab %llx map %x %svalid " |
1078 | "%savailable\n", fcf->fabric_name, | |
1079 | fcf->fc_map, (fcf->flags & FIP_FL_SOL) | |
1080 | ? "" : "in", (fcf->flags & FIP_FL_AVAIL) | |
1081 | ? "" : "un"); | |
97c8389d JE |
1082 | continue; |
1083 | } | |
1084 | if (!best) { | |
1085 | best = fcf; | |
1086 | continue; | |
1087 | } | |
1088 | if (fcf->fabric_name != best->fabric_name || | |
1089 | fcf->vfid != best->vfid || | |
1090 | fcf->fc_map != best->fc_map) { | |
650bd12b RL |
1091 | LIBFCOE_FIP_DBG("Conflicting fabric, VFID, " |
1092 | "or FC-MAP\n"); | |
97c8389d JE |
1093 | return; |
1094 | } | |
1095 | if (fcf->pri < best->pri) | |
1096 | best = fcf; | |
1097 | } | |
1098 | fip->sel_fcf = best; | |
1099 | } | |
1100 | ||
1101 | /** | |
1102 | * fcoe_ctlr_timeout() - FIP timer function. | |
1103 | * @arg: &fcoe_ctlr pointer. | |
1104 | * | |
1105 | * Ages FCFs. Triggers FCF selection if possible. Sends keep-alives. | |
1106 | */ | |
1107 | static void fcoe_ctlr_timeout(unsigned long arg) | |
1108 | { | |
1109 | struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg; | |
1110 | struct fcoe_fcf *sel; | |
1111 | struct fcoe_fcf *fcf; | |
1112 | unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD); | |
97c8389d JE |
1113 | u8 send_ctlr_ka; |
1114 | u8 send_port_ka; | |
1115 | ||
1116 | spin_lock_bh(&fip->lock); | |
1117 | if (fip->state == FIP_ST_DISABLED) { | |
1118 | spin_unlock_bh(&fip->lock); | |
1119 | return; | |
1120 | } | |
1121 | ||
1122 | fcf = fip->sel_fcf; | |
1123 | fcoe_ctlr_age_fcfs(fip); | |
1124 | ||
1125 | sel = fip->sel_fcf; | |
1126 | if (!sel && fip->sel_time && time_after_eq(jiffies, fip->sel_time)) { | |
1127 | fcoe_ctlr_select(fip); | |
1128 | sel = fip->sel_fcf; | |
1129 | fip->sel_time = 0; | |
1130 | } | |
1131 | ||
1132 | if (sel != fcf) { | |
1133 | fcf = sel; /* the old FCF may have been freed */ | |
1134 | if (sel) { | |
650bd12b | 1135 | printk(KERN_INFO "libfcoe: host%d: FIP selected " |
66d6faec JB |
1136 | "Fibre-Channel Forwarder MAC %pM\n", |
1137 | fip->lp->host->host_no, sel->fcf_mac); | |
97c8389d JE |
1138 | memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN); |
1139 | fip->port_ka_time = jiffies + | |
1140 | msecs_to_jiffies(FIP_VN_KA_PERIOD); | |
1141 | fip->ctlr_ka_time = jiffies + sel->fka_period; | |
1142 | fip->link = 1; | |
1143 | } else { | |
650bd12b | 1144 | printk(KERN_NOTICE "libfcoe: host%d: " |
97c8389d JE |
1145 | "FIP Fibre-Channel Forwarder timed out. " |
1146 | "Starting FCF discovery.\n", | |
1147 | fip->lp->host->host_no); | |
1148 | fip->link = 0; | |
1149 | } | |
1150 | schedule_work(&fip->link_work); | |
1151 | } | |
1152 | ||
1153 | send_ctlr_ka = 0; | |
1154 | send_port_ka = 0; | |
1155 | if (sel) { | |
1156 | if (time_after_eq(jiffies, fip->ctlr_ka_time)) { | |
1157 | fip->ctlr_ka_time = jiffies + sel->fka_period; | |
1158 | send_ctlr_ka = 1; | |
1159 | } | |
1160 | if (time_after(next_timer, fip->ctlr_ka_time)) | |
1161 | next_timer = fip->ctlr_ka_time; | |
1162 | ||
1163 | if (time_after_eq(jiffies, fip->port_ka_time)) { | |
1164 | fip->port_ka_time += jiffies + | |
1165 | msecs_to_jiffies(FIP_VN_KA_PERIOD); | |
1166 | send_port_ka = 1; | |
1167 | } | |
1168 | if (time_after(next_timer, fip->port_ka_time)) | |
1169 | next_timer = fip->port_ka_time; | |
1170 | mod_timer(&fip->timer, next_timer); | |
1171 | } else if (fip->sel_time) { | |
1172 | next_timer = fip->sel_time + | |
1173 | msecs_to_jiffies(FCOE_CTLR_START_DELAY); | |
1174 | mod_timer(&fip->timer, next_timer); | |
1175 | } | |
1176 | spin_unlock_bh(&fip->lock); | |
1177 | ||
1178 | if (send_ctlr_ka) | |
1179 | fcoe_ctlr_send_keep_alive(fip, 0, fip->ctl_src_addr); | |
1180 | if (send_port_ka) | |
1181 | fcoe_ctlr_send_keep_alive(fip, 1, fip->data_src_addr); | |
1182 | } | |
1183 | ||
1184 | /** | |
1185 | * fcoe_ctlr_link_work() - worker thread function for link changes. | |
1186 | * @work: pointer to link_work member inside &fcoe_ctlr. | |
1187 | * | |
1188 | * See if the link status has changed and if so, report it. | |
1189 | * | |
1190 | * This is here because fc_linkup() and fc_linkdown() must not | |
1191 | * be called from the timer directly, since they use a mutex. | |
1192 | */ | |
1193 | static void fcoe_ctlr_link_work(struct work_struct *work) | |
1194 | { | |
1195 | struct fcoe_ctlr *fip; | |
1196 | int link; | |
1197 | int last_link; | |
1198 | ||
1199 | fip = container_of(work, struct fcoe_ctlr, link_work); | |
1200 | spin_lock_bh(&fip->lock); | |
1201 | last_link = fip->last_link; | |
1202 | link = fip->link; | |
1203 | fip->last_link = link; | |
1204 | spin_unlock_bh(&fip->lock); | |
1205 | ||
1206 | if (last_link != link) { | |
1207 | if (link) | |
1208 | fc_linkup(fip->lp); | |
1209 | else | |
1210 | fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT); | |
1211 | } | |
1212 | } | |
1213 | ||
1214 | /** | |
1215 | * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames. | |
1216 | * @recv_work: pointer to recv_work member inside &fcoe_ctlr. | |
1217 | */ | |
1218 | static void fcoe_ctlr_recv_work(struct work_struct *recv_work) | |
1219 | { | |
1220 | struct fcoe_ctlr *fip; | |
1221 | struct sk_buff *skb; | |
1222 | ||
1223 | fip = container_of(recv_work, struct fcoe_ctlr, recv_work); | |
1224 | spin_lock_bh(&fip->fip_recv_list.lock); | |
1225 | while ((skb = __skb_dequeue(&fip->fip_recv_list))) { | |
1226 | spin_unlock_bh(&fip->fip_recv_list.lock); | |
1227 | fcoe_ctlr_recv_handler(fip, skb); | |
1228 | spin_lock_bh(&fip->fip_recv_list.lock); | |
1229 | } | |
1230 | spin_unlock_bh(&fip->fip_recv_list.lock); | |
1231 | } | |
1232 | ||
1233 | /** | |
1234 | * fcoe_ctlr_recv_flogi() - snoop Pre-FIP receipt of FLOGI response or request. | |
1235 | * @fip: FCoE controller. | |
1236 | * @fp: FC frame. | |
1237 | * @sa: Ethernet source MAC address from received FCoE frame. | |
1238 | * | |
1239 | * Snoop potential response to FLOGI or even incoming FLOGI. | |
1240 | * | |
1241 | * The caller has checked that we are waiting for login as indicated | |
1242 | * by fip->flogi_oxid != FC_XID_UNKNOWN. | |
1243 | * | |
1244 | * The caller is responsible for freeing the frame. | |
1245 | * | |
1246 | * Return non-zero if the frame should not be delivered to libfc. | |
1247 | */ | |
1248 | int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_frame *fp, u8 *sa) | |
1249 | { | |
1250 | struct fc_frame_header *fh; | |
1251 | u8 op; | |
1252 | u8 mac[ETH_ALEN]; | |
1253 | ||
1254 | fh = fc_frame_header_get(fp); | |
1255 | if (fh->fh_type != FC_TYPE_ELS) | |
1256 | return 0; | |
1257 | ||
1258 | op = fc_frame_payload_op(fp); | |
1259 | if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP && | |
1260 | fip->flogi_oxid == ntohs(fh->fh_ox_id)) { | |
1261 | ||
1262 | spin_lock_bh(&fip->lock); | |
1263 | if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) { | |
1264 | spin_unlock_bh(&fip->lock); | |
1265 | return -EINVAL; | |
1266 | } | |
1267 | fip->state = FIP_ST_NON_FIP; | |
650bd12b | 1268 | LIBFCOE_FIP_DBG("received FLOGI LS_ACC using non-FIP mode\n"); |
97c8389d JE |
1269 | |
1270 | /* | |
1271 | * FLOGI accepted. | |
1272 | * If the src mac addr is FC_OUI-based, then we mark the | |
1273 | * address_mode flag to use FC_OUI-based Ethernet DA. | |
1274 | * Otherwise we use the FCoE gateway addr | |
1275 | */ | |
1276 | if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) { | |
1277 | fip->map_dest = 1; | |
1278 | } else { | |
1279 | memcpy(fip->dest_addr, sa, ETH_ALEN); | |
1280 | fip->map_dest = 0; | |
1281 | } | |
1282 | fip->flogi_oxid = FC_XID_UNKNOWN; | |
1283 | memcpy(mac, fip->data_src_addr, ETH_ALEN); | |
1284 | fc_fcoe_set_mac(fip->data_src_addr, fh->fh_d_id); | |
1285 | spin_unlock_bh(&fip->lock); | |
1286 | ||
1287 | fip->update_mac(fip, mac, fip->data_src_addr); | |
1288 | } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) { | |
1289 | /* | |
1290 | * Save source MAC for point-to-point responses. | |
1291 | */ | |
1292 | spin_lock_bh(&fip->lock); | |
1293 | if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) { | |
1294 | memcpy(fip->dest_addr, sa, ETH_ALEN); | |
1295 | fip->map_dest = 0; | |
1296 | if (fip->state == FIP_ST_NON_FIP) | |
650bd12b | 1297 | LIBFCOE_FIP_DBG("received FLOGI REQ, " |
97c8389d JE |
1298 | "using non-FIP mode\n"); |
1299 | fip->state = FIP_ST_NON_FIP; | |
1300 | } | |
1301 | spin_unlock_bh(&fip->lock); | |
1302 | } | |
1303 | return 0; | |
1304 | } | |
1305 | EXPORT_SYMBOL(fcoe_ctlr_recv_flogi); | |
1306 | ||
5e80f7f7 VD |
1307 | /** |
1308 | * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN. | |
1309 | * @mac: mac address | |
1310 | * @scheme: check port | |
1311 | * @port: port indicator for converting | |
1312 | * | |
1313 | * Returns: u64 fc world wide name | |
1314 | */ | |
1315 | u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN], | |
1316 | unsigned int scheme, unsigned int port) | |
1317 | { | |
1318 | u64 wwn; | |
1319 | u64 host_mac; | |
1320 | ||
1321 | /* The MAC is in NO, so flip only the low 48 bits */ | |
1322 | host_mac = ((u64) mac[0] << 40) | | |
1323 | ((u64) mac[1] << 32) | | |
1324 | ((u64) mac[2] << 24) | | |
1325 | ((u64) mac[3] << 16) | | |
1326 | ((u64) mac[4] << 8) | | |
1327 | (u64) mac[5]; | |
1328 | ||
1329 | WARN_ON(host_mac >= (1ULL << 48)); | |
1330 | wwn = host_mac | ((u64) scheme << 60); | |
1331 | switch (scheme) { | |
1332 | case 1: | |
1333 | WARN_ON(port != 0); | |
1334 | break; | |
1335 | case 2: | |
1336 | WARN_ON(port >= 0xfff); | |
1337 | wwn |= (u64) port << 48; | |
1338 | break; | |
1339 | default: | |
1340 | WARN_ON(1); | |
1341 | break; | |
1342 | } | |
1343 | ||
1344 | return wwn; | |
1345 | } | |
1346 | EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac); | |
1347 | ||
1348 | /** | |
1349 | * fcoe_libfc_config() - sets up libfc related properties for lport | |
1350 | * @lp: ptr to the fc_lport | |
1351 | * @tt: libfc function template | |
1352 | * | |
1353 | * Returns : 0 for success | |
1354 | */ | |
1355 | int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt) | |
1356 | { | |
1357 | /* Set the function pointers set by the LLDD */ | |
1358 | memcpy(&lp->tt, tt, sizeof(*tt)); | |
1359 | if (fc_fcp_init(lp)) | |
1360 | return -ENOMEM; | |
1361 | fc_exch_init(lp); | |
1362 | fc_elsct_init(lp); | |
1363 | fc_lport_init(lp); | |
1364 | fc_rport_init(lp); | |
1365 | fc_disc_init(lp); | |
1366 | ||
1367 | return 0; | |
1368 | } | |
1369 | EXPORT_SYMBOL_GPL(fcoe_libfc_config); |