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85b4aa49 RL |
1 | /* |
2 | * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | * | |
17 | * Maintained at www.Open-FCoE.org | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/version.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/ethtool.h> | |
28 | #include <linux/if_ether.h> | |
29 | #include <linux/if_vlan.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/crc32.h> | |
32 | #include <linux/cpu.h> | |
33 | #include <linux/fs.h> | |
34 | #include <linux/sysfs.h> | |
35 | #include <linux/ctype.h> | |
36 | #include <scsi/scsi_tcq.h> | |
37 | #include <scsi/scsicam.h> | |
38 | #include <scsi/scsi_transport.h> | |
39 | #include <scsi/scsi_transport_fc.h> | |
40 | #include <net/rtnetlink.h> | |
41 | ||
42 | #include <scsi/fc/fc_encaps.h> | |
43 | ||
44 | #include <scsi/libfc.h> | |
45 | #include <scsi/fc_frame.h> | |
46 | #include <scsi/libfcoe.h> | |
47 | #include <scsi/fc_transport_fcoe.h> | |
48 | ||
49 | static int debug_fcoe; | |
50 | ||
51 | #define FCOE_MAX_QUEUE_DEPTH 256 | |
c826a314 | 52 | #define FCOE_LOW_QUEUE_DEPTH 32 |
85b4aa49 RL |
53 | |
54 | /* destination address mode */ | |
55 | #define FCOE_GW_ADDR_MODE 0x00 | |
56 | #define FCOE_FCOUI_ADDR_MODE 0x01 | |
57 | ||
58 | #define FCOE_WORD_TO_BYTE 4 | |
59 | ||
60 | MODULE_AUTHOR("Open-FCoE.org"); | |
61 | MODULE_DESCRIPTION("FCoE"); | |
62 | MODULE_LICENSE("GPL"); | |
63 | ||
64 | /* fcoe host list */ | |
65 | LIST_HEAD(fcoe_hostlist); | |
66 | DEFINE_RWLOCK(fcoe_hostlist_lock); | |
67 | DEFINE_TIMER(fcoe_timer, NULL, 0, 0); | |
68 | struct fcoe_percpu_s *fcoe_percpu[NR_CPUS]; | |
69 | ||
70 | ||
71 | /* Function Prototyes */ | |
72 | static int fcoe_check_wait_queue(struct fc_lport *); | |
85b4aa49 RL |
73 | static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *); |
74 | #ifdef CONFIG_HOTPLUG_CPU | |
75 | static int fcoe_cpu_callback(struct notifier_block *, ulong, void *); | |
76 | #endif /* CONFIG_HOTPLUG_CPU */ | |
77 | static int fcoe_device_notification(struct notifier_block *, ulong, void *); | |
78 | static void fcoe_dev_setup(void); | |
79 | static void fcoe_dev_cleanup(void); | |
80 | ||
81 | /* notification function from net device */ | |
82 | static struct notifier_block fcoe_notifier = { | |
83 | .notifier_call = fcoe_device_notification, | |
84 | }; | |
85 | ||
86 | ||
87 | #ifdef CONFIG_HOTPLUG_CPU | |
88 | static struct notifier_block fcoe_cpu_notifier = { | |
89 | .notifier_call = fcoe_cpu_callback, | |
90 | }; | |
91 | ||
92 | /** | |
34f42a07 | 93 | * fcoe_create_percpu_data() - creates the associated cpu data |
85b4aa49 RL |
94 | * @cpu: index for the cpu where fcoe cpu data will be created |
95 | * | |
96 | * create percpu stats block, from cpu add notifier | |
97 | * | |
98 | * Returns: none | |
34f42a07 | 99 | */ |
85b4aa49 RL |
100 | static void fcoe_create_percpu_data(int cpu) |
101 | { | |
102 | struct fc_lport *lp; | |
103 | struct fcoe_softc *fc; | |
104 | ||
105 | write_lock_bh(&fcoe_hostlist_lock); | |
106 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
107 | lp = fc->lp; | |
108 | if (lp->dev_stats[cpu] == NULL) | |
109 | lp->dev_stats[cpu] = | |
110 | kzalloc(sizeof(struct fcoe_dev_stats), | |
111 | GFP_KERNEL); | |
112 | } | |
113 | write_unlock_bh(&fcoe_hostlist_lock); | |
114 | } | |
115 | ||
116 | /** | |
34f42a07 | 117 | * fcoe_destroy_percpu_data() - destroys the associated cpu data |
85b4aa49 RL |
118 | * @cpu: index for the cpu where fcoe cpu data will destroyed |
119 | * | |
120 | * destroy percpu stats block called by cpu add/remove notifier | |
121 | * | |
122 | * Retuns: none | |
34f42a07 | 123 | */ |
85b4aa49 RL |
124 | static void fcoe_destroy_percpu_data(int cpu) |
125 | { | |
126 | struct fc_lport *lp; | |
127 | struct fcoe_softc *fc; | |
128 | ||
129 | write_lock_bh(&fcoe_hostlist_lock); | |
130 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
131 | lp = fc->lp; | |
132 | kfree(lp->dev_stats[cpu]); | |
133 | lp->dev_stats[cpu] = NULL; | |
134 | } | |
135 | write_unlock_bh(&fcoe_hostlist_lock); | |
136 | } | |
137 | ||
138 | /** | |
34f42a07 | 139 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback |
85b4aa49 RL |
140 | * @nfb: callback data block |
141 | * @action: event triggering the callback | |
142 | * @hcpu: index for the cpu of this event | |
143 | * | |
144 | * this creates or destroys per cpu data for fcoe | |
145 | * | |
146 | * Returns NOTIFY_OK always. | |
34f42a07 | 147 | */ |
85b4aa49 RL |
148 | static int fcoe_cpu_callback(struct notifier_block *nfb, unsigned long action, |
149 | void *hcpu) | |
150 | { | |
151 | unsigned int cpu = (unsigned long)hcpu; | |
152 | ||
153 | switch (action) { | |
154 | case CPU_ONLINE: | |
155 | fcoe_create_percpu_data(cpu); | |
156 | break; | |
157 | case CPU_DEAD: | |
158 | fcoe_destroy_percpu_data(cpu); | |
159 | break; | |
160 | default: | |
161 | break; | |
162 | } | |
163 | return NOTIFY_OK; | |
164 | } | |
165 | #endif /* CONFIG_HOTPLUG_CPU */ | |
166 | ||
167 | /** | |
34f42a07 | 168 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
169 | * @skb: the receive skb |
170 | * @dev: associated net device | |
171 | * @ptype: context | |
172 | * @odldev: last device | |
173 | * | |
174 | * this function will receive the packet and build fc frame and pass it up | |
175 | * | |
176 | * Returns: 0 for success | |
34f42a07 | 177 | */ |
85b4aa49 RL |
178 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
179 | struct packet_type *ptype, struct net_device *olddev) | |
180 | { | |
181 | struct fc_lport *lp; | |
182 | struct fcoe_rcv_info *fr; | |
183 | struct fcoe_softc *fc; | |
184 | struct fcoe_dev_stats *stats; | |
185 | struct fc_frame_header *fh; | |
186 | unsigned short oxid; | |
187 | int cpu_idx; | |
188 | struct fcoe_percpu_s *fps; | |
189 | ||
190 | fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); | |
191 | lp = fc->lp; | |
192 | if (unlikely(lp == NULL)) { | |
193 | FC_DBG("cannot find hba structure"); | |
194 | goto err2; | |
195 | } | |
196 | ||
197 | if (unlikely(debug_fcoe)) { | |
198 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p " | |
199 | "end:%p sum:%d dev:%s", skb->len, skb->data_len, | |
200 | skb->head, skb->data, skb_tail_pointer(skb), | |
201 | skb_end_pointer(skb), skb->csum, | |
202 | skb->dev ? skb->dev->name : "<NULL>"); | |
203 | ||
204 | } | |
205 | ||
206 | /* check for FCOE packet type */ | |
207 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
208 | FC_DBG("wrong FC type frame"); | |
209 | goto err; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Check for minimum frame length, and make sure required FCoE | |
214 | * and FC headers are pulled into the linear data area. | |
215 | */ | |
216 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
217 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
218 | goto err; | |
219 | ||
220 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
221 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
222 | ||
223 | oxid = ntohs(fh->fh_ox_id); | |
224 | ||
225 | fr = fcoe_dev_from_skb(skb); | |
226 | fr->fr_dev = lp; | |
227 | fr->ptype = ptype; | |
228 | cpu_idx = 0; | |
229 | #ifdef CONFIG_SMP | |
230 | /* | |
231 | * The incoming frame exchange id(oxid) is ANDed with num of online | |
232 | * cpu bits to get cpu_idx and then this cpu_idx is used for selecting | |
233 | * a per cpu kernel thread from fcoe_percpu. In case the cpu is | |
234 | * offline or no kernel thread for derived cpu_idx then cpu_idx is | |
235 | * initialize to first online cpu index. | |
236 | */ | |
237 | cpu_idx = oxid & (num_online_cpus() - 1); | |
238 | if (!fcoe_percpu[cpu_idx] || !cpu_online(cpu_idx)) | |
239 | cpu_idx = first_cpu(cpu_online_map); | |
240 | #endif | |
241 | fps = fcoe_percpu[cpu_idx]; | |
242 | ||
243 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
244 | __skb_queue_tail(&fps->fcoe_rx_list, skb); | |
245 | if (fps->fcoe_rx_list.qlen == 1) | |
246 | wake_up_process(fps->thread); | |
247 | ||
248 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
249 | ||
250 | return 0; | |
251 | err: | |
252 | #ifdef CONFIG_SMP | |
253 | stats = lp->dev_stats[smp_processor_id()]; | |
254 | #else | |
255 | stats = lp->dev_stats[0]; | |
256 | #endif | |
257 | if (stats) | |
258 | stats->ErrorFrames++; | |
259 | ||
260 | err2: | |
261 | kfree_skb(skb); | |
262 | return -1; | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(fcoe_rcv); | |
265 | ||
266 | /** | |
34f42a07 | 267 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
268 | * @skb: the skb to be xmitted |
269 | * | |
270 | * Returns: 0 for success | |
34f42a07 | 271 | */ |
85b4aa49 RL |
272 | static inline int fcoe_start_io(struct sk_buff *skb) |
273 | { | |
274 | int rc; | |
275 | ||
276 | skb_get(skb); | |
277 | rc = dev_queue_xmit(skb); | |
278 | if (rc != 0) | |
279 | return rc; | |
280 | kfree_skb(skb); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | /** | |
34f42a07 | 285 | * fcoe_get_paged_crc_eof() - in case we need alloc a page for crc_eof |
85b4aa49 RL |
286 | * @skb: the skb to be xmitted |
287 | * @tlen: total len | |
288 | * | |
289 | * Returns: 0 for success | |
34f42a07 | 290 | */ |
85b4aa49 RL |
291 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
292 | { | |
293 | struct fcoe_percpu_s *fps; | |
294 | struct page *page; | |
295 | int cpu_idx; | |
296 | ||
297 | cpu_idx = get_cpu(); | |
298 | fps = fcoe_percpu[cpu_idx]; | |
299 | page = fps->crc_eof_page; | |
300 | if (!page) { | |
301 | page = alloc_page(GFP_ATOMIC); | |
302 | if (!page) { | |
303 | put_cpu(); | |
304 | return -ENOMEM; | |
305 | } | |
306 | fps->crc_eof_page = page; | |
307 | WARN_ON(fps->crc_eof_offset != 0); | |
308 | } | |
309 | ||
310 | get_page(page); | |
311 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
312 | fps->crc_eof_offset, tlen); | |
313 | skb->len += tlen; | |
314 | skb->data_len += tlen; | |
315 | skb->truesize += tlen; | |
316 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
317 | ||
318 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
319 | fps->crc_eof_page = NULL; | |
320 | fps->crc_eof_offset = 0; | |
321 | put_page(page); | |
322 | } | |
323 | put_cpu(); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | /** | |
34f42a07 | 328 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
85b4aa49 RL |
329 | * @fp: the fc_frame containg data to be checksummed |
330 | * | |
331 | * This uses crc32() to calculate the crc for fc frame | |
332 | * Return : 32 bit crc | |
34f42a07 | 333 | */ |
85b4aa49 RL |
334 | u32 fcoe_fc_crc(struct fc_frame *fp) |
335 | { | |
336 | struct sk_buff *skb = fp_skb(fp); | |
337 | struct skb_frag_struct *frag; | |
338 | unsigned char *data; | |
339 | unsigned long off, len, clen; | |
340 | u32 crc; | |
341 | unsigned i; | |
342 | ||
343 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
344 | ||
345 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
346 | frag = &skb_shinfo(skb)->frags[i]; | |
347 | off = frag->page_offset; | |
348 | len = frag->size; | |
349 | while (len > 0) { | |
350 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
351 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
352 | KM_SKB_DATA_SOFTIRQ); | |
353 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
354 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
355 | off += clen; | |
356 | len -= clen; | |
357 | } | |
358 | } | |
359 | return crc; | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(fcoe_fc_crc); | |
362 | ||
363 | /** | |
34f42a07 | 364 | * fcoe_xmit() - FCoE frame transmit function |
85b4aa49 RL |
365 | * @lp: the associated local port |
366 | * @fp: the fc_frame to be transmitted | |
367 | * | |
368 | * Return : 0 for success | |
34f42a07 | 369 | */ |
85b4aa49 RL |
370 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
371 | { | |
372 | int wlen, rc = 0; | |
373 | u32 crc; | |
374 | struct ethhdr *eh; | |
375 | struct fcoe_crc_eof *cp; | |
376 | struct sk_buff *skb; | |
377 | struct fcoe_dev_stats *stats; | |
378 | struct fc_frame_header *fh; | |
379 | unsigned int hlen; /* header length implies the version */ | |
380 | unsigned int tlen; /* trailer length */ | |
381 | unsigned int elen; /* eth header, may include vlan */ | |
382 | int flogi_in_progress = 0; | |
383 | struct fcoe_softc *fc; | |
384 | u8 sof, eof; | |
385 | struct fcoe_hdr *hp; | |
386 | ||
387 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
388 | ||
fc47ff6b | 389 | fc = lport_priv(lp); |
85b4aa49 RL |
390 | /* |
391 | * if it is a flogi then we need to learn gw-addr | |
392 | * and my own fcid | |
393 | */ | |
394 | fh = fc_frame_header_get(fp); | |
395 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) { | |
396 | if (fc_frame_payload_op(fp) == ELS_FLOGI) { | |
397 | fc->flogi_oxid = ntohs(fh->fh_ox_id); | |
398 | fc->address_mode = FCOE_FCOUI_ADDR_MODE; | |
399 | fc->flogi_progress = 1; | |
400 | flogi_in_progress = 1; | |
401 | } else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) { | |
402 | /* | |
403 | * Here we must've gotten an SID by accepting an FLOGI | |
404 | * from a point-to-point connection. Switch to using | |
405 | * the source mac based on the SID. The destination | |
406 | * MAC in this case would have been set by receving the | |
407 | * FLOGI. | |
408 | */ | |
409 | fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id); | |
410 | fc->flogi_progress = 0; | |
411 | } | |
412 | } | |
413 | ||
414 | skb = fp_skb(fp); | |
415 | sof = fr_sof(fp); | |
416 | eof = fr_eof(fp); | |
417 | ||
418 | elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ? | |
419 | sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr); | |
420 | hlen = sizeof(struct fcoe_hdr); | |
421 | tlen = sizeof(struct fcoe_crc_eof); | |
422 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
423 | ||
424 | /* crc offload */ | |
425 | if (likely(lp->crc_offload)) { | |
426 | skb->ip_summed = CHECKSUM_COMPLETE; | |
427 | skb->csum_start = skb_headroom(skb); | |
428 | skb->csum_offset = skb->len; | |
429 | crc = 0; | |
430 | } else { | |
431 | skb->ip_summed = CHECKSUM_NONE; | |
432 | crc = fcoe_fc_crc(fp); | |
433 | } | |
434 | ||
435 | /* copy fc crc and eof to the skb buff */ | |
436 | if (skb_is_nonlinear(skb)) { | |
437 | skb_frag_t *frag; | |
438 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 439 | kfree_skb(skb); |
85b4aa49 RL |
440 | return -ENOMEM; |
441 | } | |
442 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
443 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
444 | + frag->page_offset; | |
445 | } else { | |
446 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
447 | } | |
448 | ||
449 | memset(cp, 0, sizeof(*cp)); | |
450 | cp->fcoe_eof = eof; | |
451 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
452 | ||
453 | if (skb_is_nonlinear(skb)) { | |
454 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
455 | cp = NULL; | |
456 | } | |
457 | ||
458 | /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */ | |
459 | skb_push(skb, elen + hlen); | |
460 | skb_reset_mac_header(skb); | |
461 | skb_reset_network_header(skb); | |
462 | skb->mac_len = elen; | |
463 | skb->protocol = htons(ETH_P_802_3); | |
464 | skb->dev = fc->real_dev; | |
465 | ||
466 | /* fill up mac and fcoe headers */ | |
467 | eh = eth_hdr(skb); | |
468 | eh->h_proto = htons(ETH_P_FCOE); | |
469 | if (fc->address_mode == FCOE_FCOUI_ADDR_MODE) | |
470 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); | |
471 | else | |
472 | /* insert GW address */ | |
473 | memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN); | |
474 | ||
475 | if (unlikely(flogi_in_progress)) | |
476 | memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN); | |
477 | else | |
478 | memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN); | |
479 | ||
480 | hp = (struct fcoe_hdr *)(eh + 1); | |
481 | memset(hp, 0, sizeof(*hp)); | |
482 | if (FC_FCOE_VER) | |
483 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
484 | hp->fcoe_sof = sof; | |
485 | ||
486 | /* update tx stats: regardless if LLD fails */ | |
487 | stats = lp->dev_stats[smp_processor_id()]; | |
488 | if (stats) { | |
489 | stats->TxFrames++; | |
490 | stats->TxWords += wlen; | |
491 | } | |
492 | ||
493 | /* send down to lld */ | |
494 | fr_dev(fp) = lp; | |
495 | if (fc->fcoe_pending_queue.qlen) | |
496 | rc = fcoe_check_wait_queue(lp); | |
497 | ||
498 | if (rc == 0) | |
499 | rc = fcoe_start_io(skb); | |
500 | ||
501 | if (rc) { | |
55c8bafb CL |
502 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
503 | __skb_queue_tail(&fc->fcoe_pending_queue, skb); | |
504 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
85b4aa49 | 505 | if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
bc0e17f6 | 506 | lp->qfull = 1; |
85b4aa49 RL |
507 | } |
508 | ||
509 | return 0; | |
510 | } | |
511 | EXPORT_SYMBOL_GPL(fcoe_xmit); | |
512 | ||
34f42a07 RL |
513 | /** |
514 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
515 | * @arg: ptr to the fcoe per cpu struct |
516 | * | |
517 | * Return: 0 for success | |
85b4aa49 RL |
518 | */ |
519 | int fcoe_percpu_receive_thread(void *arg) | |
520 | { | |
521 | struct fcoe_percpu_s *p = arg; | |
522 | u32 fr_len; | |
523 | struct fc_lport *lp; | |
524 | struct fcoe_rcv_info *fr; | |
525 | struct fcoe_dev_stats *stats; | |
526 | struct fc_frame_header *fh; | |
527 | struct sk_buff *skb; | |
528 | struct fcoe_crc_eof crc_eof; | |
529 | struct fc_frame *fp; | |
530 | u8 *mac = NULL; | |
531 | struct fcoe_softc *fc; | |
532 | struct fcoe_hdr *hp; | |
533 | ||
534 | set_user_nice(current, 19); | |
535 | ||
536 | while (!kthread_should_stop()) { | |
537 | ||
538 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
539 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
540 | set_current_state(TASK_INTERRUPTIBLE); | |
541 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
542 | schedule(); | |
543 | set_current_state(TASK_RUNNING); | |
544 | if (kthread_should_stop()) | |
545 | return 0; | |
546 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
547 | } | |
548 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
549 | fr = fcoe_dev_from_skb(skb); | |
550 | lp = fr->fr_dev; | |
551 | if (unlikely(lp == NULL)) { | |
552 | FC_DBG("invalid HBA Structure"); | |
553 | kfree_skb(skb); | |
554 | continue; | |
555 | } | |
556 | ||
557 | stats = lp->dev_stats[smp_processor_id()]; | |
558 | ||
559 | if (unlikely(debug_fcoe)) { | |
560 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p " | |
561 | "tail:%p end:%p sum:%d dev:%s", | |
562 | skb->len, skb->data_len, | |
563 | skb->head, skb->data, skb_tail_pointer(skb), | |
564 | skb_end_pointer(skb), skb->csum, | |
565 | skb->dev ? skb->dev->name : "<NULL>"); | |
566 | } | |
567 | ||
568 | /* | |
569 | * Save source MAC address before discarding header. | |
570 | */ | |
571 | fc = lport_priv(lp); | |
572 | if (unlikely(fc->flogi_progress)) | |
573 | mac = eth_hdr(skb)->h_source; | |
574 | ||
575 | if (skb_is_nonlinear(skb)) | |
576 | skb_linearize(skb); /* not ideal */ | |
577 | ||
578 | /* | |
579 | * Frame length checks and setting up the header pointers | |
580 | * was done in fcoe_rcv already. | |
581 | */ | |
582 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
583 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
584 | ||
585 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { | |
586 | if (stats) { | |
587 | if (stats->ErrorFrames < 5) | |
588 | FC_DBG("unknown FCoE version %x", | |
589 | FC_FCOE_DECAPS_VER(hp)); | |
590 | stats->ErrorFrames++; | |
591 | } | |
592 | kfree_skb(skb); | |
593 | continue; | |
594 | } | |
595 | ||
596 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
597 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
598 | ||
599 | if (stats) { | |
600 | stats->RxFrames++; | |
601 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
602 | } | |
603 | ||
604 | fp = (struct fc_frame *)skb; | |
605 | fc_frame_init(fp); | |
606 | fr_dev(fp) = lp; | |
607 | fr_sof(fp) = hp->fcoe_sof; | |
608 | ||
609 | /* Copy out the CRC and EOF trailer for access */ | |
610 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
611 | kfree_skb(skb); | |
612 | continue; | |
613 | } | |
614 | fr_eof(fp) = crc_eof.fcoe_eof; | |
615 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
616 | if (pskb_trim(skb, fr_len)) { | |
617 | kfree_skb(skb); | |
618 | continue; | |
619 | } | |
620 | ||
621 | /* | |
622 | * We only check CRC if no offload is available and if it is | |
623 | * it's solicited data, in which case, the FCP layer would | |
624 | * check it during the copy. | |
625 | */ | |
626 | if (lp->crc_offload) | |
627 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
628 | else | |
629 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
630 | ||
631 | fh = fc_frame_header_get(fp); | |
632 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
633 | fh->fh_type == FC_TYPE_FCP) { | |
634 | fc_exch_recv(lp, lp->emp, fp); | |
635 | continue; | |
636 | } | |
637 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
638 | if (le32_to_cpu(fr_crc(fp)) != | |
639 | ~crc32(~0, skb->data, fr_len)) { | |
640 | if (debug_fcoe || stats->InvalidCRCCount < 5) | |
641 | printk(KERN_WARNING "fcoe: dropping " | |
642 | "frame with CRC error\n"); | |
643 | stats->InvalidCRCCount++; | |
644 | stats->ErrorFrames++; | |
645 | fc_frame_free(fp); | |
646 | continue; | |
647 | } | |
648 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
649 | } | |
650 | /* non flogi and non data exchanges are handled here */ | |
651 | if (unlikely(fc->flogi_progress)) | |
652 | fcoe_recv_flogi(fc, fp, mac); | |
653 | fc_exch_recv(lp, lp->emp, fp); | |
654 | } | |
655 | return 0; | |
656 | } | |
657 | ||
658 | /** | |
34f42a07 | 659 | * fcoe_recv_flogi() - flogi receive function |
85b4aa49 RL |
660 | * @fc: associated fcoe_softc |
661 | * @fp: the recieved frame | |
662 | * @sa: the source address of this flogi | |
663 | * | |
664 | * This is responsible to parse the flogi response and sets the corresponding | |
665 | * mac address for the initiator, eitehr OUI based or GW based. | |
666 | * | |
667 | * Returns: none | |
34f42a07 | 668 | */ |
85b4aa49 RL |
669 | static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa) |
670 | { | |
671 | struct fc_frame_header *fh; | |
672 | u8 op; | |
673 | ||
674 | fh = fc_frame_header_get(fp); | |
675 | if (fh->fh_type != FC_TYPE_ELS) | |
676 | return; | |
677 | op = fc_frame_payload_op(fp); | |
678 | if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP && | |
679 | fc->flogi_oxid == ntohs(fh->fh_ox_id)) { | |
680 | /* | |
681 | * FLOGI accepted. | |
682 | * If the src mac addr is FC_OUI-based, then we mark the | |
683 | * address_mode flag to use FC_OUI-based Ethernet DA. | |
684 | * Otherwise we use the FCoE gateway addr | |
685 | */ | |
686 | if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) { | |
687 | fc->address_mode = FCOE_FCOUI_ADDR_MODE; | |
688 | } else { | |
689 | memcpy(fc->dest_addr, sa, ETH_ALEN); | |
690 | fc->address_mode = FCOE_GW_ADDR_MODE; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Remove any previously-set unicast MAC filter. | |
695 | * Add secondary FCoE MAC address filter for our OUI. | |
696 | */ | |
697 | rtnl_lock(); | |
698 | if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 })) | |
699 | dev_unicast_delete(fc->real_dev, fc->data_src_addr, | |
700 | ETH_ALEN); | |
701 | fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id); | |
702 | dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN); | |
703 | rtnl_unlock(); | |
704 | ||
705 | fc->flogi_progress = 0; | |
706 | } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) { | |
707 | /* | |
708 | * Save source MAC for point-to-point responses. | |
709 | */ | |
710 | memcpy(fc->dest_addr, sa, ETH_ALEN); | |
711 | fc->address_mode = FCOE_GW_ADDR_MODE; | |
712 | } | |
713 | } | |
714 | ||
715 | /** | |
34f42a07 | 716 | * fcoe_watchdog() - fcoe timer callback |
85b4aa49 RL |
717 | * @vp: |
718 | * | |
bc0e17f6 | 719 | * This checks the pending queue length for fcoe and set lport qfull |
85b4aa49 RL |
720 | * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the |
721 | * fcoe_hostlist. | |
722 | * | |
723 | * Returns: 0 for success | |
34f42a07 | 724 | */ |
85b4aa49 RL |
725 | void fcoe_watchdog(ulong vp) |
726 | { | |
85b4aa49 | 727 | struct fcoe_softc *fc; |
85b4aa49 RL |
728 | |
729 | read_lock(&fcoe_hostlist_lock); | |
730 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
c826a314 VD |
731 | if (fc->lp) |
732 | fcoe_check_wait_queue(fc->lp); | |
85b4aa49 RL |
733 | } |
734 | read_unlock(&fcoe_hostlist_lock); | |
735 | ||
736 | fcoe_timer.expires = jiffies + (1 * HZ); | |
737 | add_timer(&fcoe_timer); | |
738 | } | |
739 | ||
740 | ||
741 | /** | |
34f42a07 | 742 | * fcoe_check_wait_queue() - put the skb into fcoe pending xmit queue |
85b4aa49 RL |
743 | * @lp: the fc_port for this skb |
744 | * @skb: the associated skb to be xmitted | |
745 | * | |
746 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
747 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 VD |
748 | * transmitted, return qlen or -1 if a error occurs, then restore |
749 | * wait_queue and try again later. | |
85b4aa49 RL |
750 | * |
751 | * The wait_queue is used when the skb transmit fails. skb will go | |
752 | * in the wait_queue which will be emptied by the time function OR | |
753 | * by the next skb transmit. | |
754 | * | |
755 | * Returns: 0 for success | |
34f42a07 | 756 | */ |
85b4aa49 RL |
757 | static int fcoe_check_wait_queue(struct fc_lport *lp) |
758 | { | |
55c8bafb | 759 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 | 760 | struct sk_buff *skb; |
c826a314 | 761 | int rc = -1; |
85b4aa49 | 762 | |
85b4aa49 | 763 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
c826a314 VD |
764 | if (fc->fcoe_pending_queue_active) |
765 | goto out; | |
766 | fc->fcoe_pending_queue_active = 1; | |
55c8bafb CL |
767 | |
768 | while (fc->fcoe_pending_queue.qlen) { | |
769 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
770 | fc->fcoe_pending_queue.qlen++; | |
771 | skb = __skb_dequeue(&fc->fcoe_pending_queue); | |
772 | ||
773 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
774 | rc = fcoe_start_io(skb); | |
775 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
776 | ||
777 | if (rc) { | |
778 | __skb_queue_head(&fc->fcoe_pending_queue, skb); | |
779 | /* undo temporary increment above */ | |
780 | fc->fcoe_pending_queue.qlen--; | |
781 | break; | |
85b4aa49 | 782 | } |
55c8bafb CL |
783 | /* undo temporary increment above */ |
784 | fc->fcoe_pending_queue.qlen--; | |
85b4aa49 | 785 | } |
55c8bafb CL |
786 | |
787 | if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) | |
788 | lp->qfull = 0; | |
c826a314 VD |
789 | fc->fcoe_pending_queue_active = 0; |
790 | rc = fc->fcoe_pending_queue.qlen; | |
791 | out: | |
85b4aa49 | 792 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
c826a314 | 793 | return rc; |
85b4aa49 RL |
794 | } |
795 | ||
85b4aa49 | 796 | /** |
34f42a07 RL |
797 | * fcoe_dev_setup() - setup link change notification interface |
798 | */ | |
799 | static void fcoe_dev_setup() | |
85b4aa49 RL |
800 | { |
801 | /* | |
802 | * here setup a interface specific wd time to | |
803 | * monitor the link state | |
804 | */ | |
805 | register_netdevice_notifier(&fcoe_notifier); | |
806 | } | |
807 | ||
808 | /** | |
34f42a07 RL |
809 | * fcoe_dev_setup() - cleanup link change notification interface |
810 | */ | |
85b4aa49 RL |
811 | static void fcoe_dev_cleanup(void) |
812 | { | |
813 | unregister_netdevice_notifier(&fcoe_notifier); | |
814 | } | |
815 | ||
816 | /** | |
34f42a07 | 817 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
818 | * @notifier: context of the notification |
819 | * @event: type of event | |
820 | * @ptr: fixed array for output parsed ifname | |
821 | * | |
822 | * This function is called by the ethernet driver in case of link change event | |
823 | * | |
824 | * Returns: 0 for success | |
34f42a07 | 825 | */ |
85b4aa49 RL |
826 | static int fcoe_device_notification(struct notifier_block *notifier, |
827 | ulong event, void *ptr) | |
828 | { | |
829 | struct fc_lport *lp = NULL; | |
830 | struct net_device *real_dev = ptr; | |
831 | struct fcoe_softc *fc; | |
832 | struct fcoe_dev_stats *stats; | |
bc0e17f6 | 833 | u32 new_link_up; |
85b4aa49 RL |
834 | u32 mfs; |
835 | int rc = NOTIFY_OK; | |
836 | ||
837 | read_lock(&fcoe_hostlist_lock); | |
838 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
839 | if (fc->real_dev == real_dev) { | |
840 | lp = fc->lp; | |
841 | break; | |
842 | } | |
843 | } | |
844 | read_unlock(&fcoe_hostlist_lock); | |
845 | if (lp == NULL) { | |
846 | rc = NOTIFY_DONE; | |
847 | goto out; | |
848 | } | |
849 | ||
bc0e17f6 | 850 | new_link_up = lp->link_up; |
85b4aa49 RL |
851 | switch (event) { |
852 | case NETDEV_DOWN: | |
853 | case NETDEV_GOING_DOWN: | |
bc0e17f6 | 854 | new_link_up = 0; |
85b4aa49 RL |
855 | break; |
856 | case NETDEV_UP: | |
857 | case NETDEV_CHANGE: | |
bc0e17f6 | 858 | new_link_up = !fcoe_link_ok(lp); |
85b4aa49 RL |
859 | break; |
860 | case NETDEV_CHANGEMTU: | |
861 | mfs = fc->real_dev->mtu - | |
862 | (sizeof(struct fcoe_hdr) + | |
863 | sizeof(struct fcoe_crc_eof)); | |
864 | if (mfs >= FC_MIN_MAX_FRAME) | |
865 | fc_set_mfs(lp, mfs); | |
bc0e17f6 | 866 | new_link_up = !fcoe_link_ok(lp); |
85b4aa49 RL |
867 | break; |
868 | case NETDEV_REGISTER: | |
869 | break; | |
870 | default: | |
871 | FC_DBG("unknown event %ld call", event); | |
872 | } | |
bc0e17f6 VD |
873 | if (lp->link_up != new_link_up) { |
874 | if (new_link_up) | |
85b4aa49 RL |
875 | fc_linkup(lp); |
876 | else { | |
877 | stats = lp->dev_stats[smp_processor_id()]; | |
878 | if (stats) | |
879 | stats->LinkFailureCount++; | |
880 | fc_linkdown(lp); | |
881 | fcoe_clean_pending_queue(lp); | |
882 | } | |
883 | } | |
884 | out: | |
885 | return rc; | |
886 | } | |
887 | ||
888 | /** | |
34f42a07 | 889 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
890 | * @ifname: fixed array for output parsed ifname |
891 | * @buffer: incoming buffer to be copied | |
892 | * | |
893 | * Returns: NULL or ptr to netdeive | |
34f42a07 | 894 | */ |
85b4aa49 RL |
895 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
896 | { | |
897 | char *cp; | |
898 | char ifname[IFNAMSIZ + 2]; | |
899 | ||
900 | if (buffer) { | |
901 | strlcpy(ifname, buffer, IFNAMSIZ); | |
902 | cp = ifname + strlen(ifname); | |
903 | while (--cp >= ifname && *cp == '\n') | |
904 | *cp = '\0'; | |
905 | return dev_get_by_name(&init_net, ifname); | |
906 | } | |
907 | return NULL; | |
908 | } | |
909 | ||
910 | /** | |
34f42a07 | 911 | * fcoe_netdev_to_module_owner() - finds out the nic drive moddule of the netdev |
85b4aa49 RL |
912 | * @netdev: the target netdev |
913 | * | |
914 | * Returns: ptr to the struct module, NULL for failure | |
34f42a07 | 915 | */ |
b2ab99c9 RL |
916 | static struct module * |
917 | fcoe_netdev_to_module_owner(const struct net_device *netdev) | |
85b4aa49 RL |
918 | { |
919 | struct device *dev; | |
920 | ||
921 | if (!netdev) | |
922 | return NULL; | |
923 | ||
924 | dev = netdev->dev.parent; | |
925 | if (!dev) | |
926 | return NULL; | |
927 | ||
928 | if (!dev->driver) | |
929 | return NULL; | |
930 | ||
931 | return dev->driver->owner; | |
932 | } | |
933 | ||
934 | /** | |
34f42a07 | 935 | * fcoe_ethdrv_get() - Hold the Ethernet driver |
85b4aa49 RL |
936 | * @netdev: the target netdev |
937 | * | |
34f42a07 RL |
938 | * Holds the Ethernet driver module by try_module_get() for |
939 | * the corresponding netdev. | |
940 | * | |
85b4aa49 | 941 | * Returns: 0 for succsss |
34f42a07 | 942 | */ |
85b4aa49 RL |
943 | static int fcoe_ethdrv_get(const struct net_device *netdev) |
944 | { | |
945 | struct module *owner; | |
946 | ||
947 | owner = fcoe_netdev_to_module_owner(netdev); | |
948 | if (owner) { | |
56b854bb JB |
949 | printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n", |
950 | module_name(owner), netdev->name); | |
85b4aa49 RL |
951 | return try_module_get(owner); |
952 | } | |
953 | return -ENODEV; | |
954 | } | |
955 | ||
956 | /** | |
34f42a07 | 957 | * fcoe_ethdrv_put() - Release the Ethernet driver |
85b4aa49 RL |
958 | * @netdev: the target netdev |
959 | * | |
34f42a07 RL |
960 | * Releases the Ethernet driver module by module_put for |
961 | * the corresponding netdev. | |
962 | * | |
85b4aa49 | 963 | * Returns: 0 for succsss |
34f42a07 | 964 | */ |
85b4aa49 RL |
965 | static int fcoe_ethdrv_put(const struct net_device *netdev) |
966 | { | |
967 | struct module *owner; | |
968 | ||
969 | owner = fcoe_netdev_to_module_owner(netdev); | |
970 | if (owner) { | |
56b854bb JB |
971 | printk(KERN_DEBUG "fcoe:release driver module %s for %s\n", |
972 | module_name(owner), netdev->name); | |
85b4aa49 RL |
973 | module_put(owner); |
974 | return 0; | |
975 | } | |
976 | return -ENODEV; | |
977 | } | |
978 | ||
979 | /** | |
34f42a07 | 980 | * fcoe_destroy() - handles the destroy from sysfs |
85b4aa49 RL |
981 | * @buffer: expcted to be a eth if name |
982 | * @kp: associated kernel param | |
983 | * | |
984 | * Returns: 0 for success | |
34f42a07 | 985 | */ |
85b4aa49 RL |
986 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
987 | { | |
988 | int rc; | |
989 | struct net_device *netdev; | |
990 | ||
991 | netdev = fcoe_if_to_netdev(buffer); | |
992 | if (!netdev) { | |
993 | rc = -ENODEV; | |
994 | goto out_nodev; | |
995 | } | |
996 | /* look for existing lport */ | |
997 | if (!fcoe_hostlist_lookup(netdev)) { | |
998 | rc = -ENODEV; | |
999 | goto out_putdev; | |
1000 | } | |
1001 | /* pass to transport */ | |
1002 | rc = fcoe_transport_release(netdev); | |
1003 | if (rc) { | |
1004 | printk(KERN_ERR "fcoe: fcoe_transport_release(%s) failed\n", | |
1005 | netdev->name); | |
1006 | rc = -EIO; | |
1007 | goto out_putdev; | |
1008 | } | |
1009 | fcoe_ethdrv_put(netdev); | |
1010 | rc = 0; | |
1011 | out_putdev: | |
1012 | dev_put(netdev); | |
1013 | out_nodev: | |
1014 | return rc; | |
1015 | } | |
1016 | ||
1017 | /** | |
34f42a07 | 1018 | * fcoe_create() - Handles the create call from sysfs |
85b4aa49 RL |
1019 | * @buffer: expcted to be a eth if name |
1020 | * @kp: associated kernel param | |
1021 | * | |
1022 | * Returns: 0 for success | |
34f42a07 | 1023 | */ |
85b4aa49 RL |
1024 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1025 | { | |
1026 | int rc; | |
1027 | struct net_device *netdev; | |
1028 | ||
1029 | netdev = fcoe_if_to_netdev(buffer); | |
1030 | if (!netdev) { | |
1031 | rc = -ENODEV; | |
1032 | goto out_nodev; | |
1033 | } | |
1034 | /* look for existing lport */ | |
1035 | if (fcoe_hostlist_lookup(netdev)) { | |
1036 | rc = -EEXIST; | |
1037 | goto out_putdev; | |
1038 | } | |
1039 | fcoe_ethdrv_get(netdev); | |
1040 | ||
1041 | /* pass to transport */ | |
1042 | rc = fcoe_transport_attach(netdev); | |
1043 | if (rc) { | |
1044 | printk(KERN_ERR "fcoe: fcoe_transport_attach(%s) failed\n", | |
1045 | netdev->name); | |
1046 | fcoe_ethdrv_put(netdev); | |
1047 | rc = -EIO; | |
1048 | goto out_putdev; | |
1049 | } | |
1050 | rc = 0; | |
1051 | out_putdev: | |
1052 | dev_put(netdev); | |
1053 | out_nodev: | |
1054 | return rc; | |
1055 | } | |
1056 | ||
1057 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1058 | __MODULE_PARM_TYPE(create, "string"); | |
1059 | MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); | |
1060 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); | |
1061 | __MODULE_PARM_TYPE(destroy, "string"); | |
1062 | MODULE_PARM_DESC(destroy, "Destroy fcoe port"); | |
1063 | ||
34f42a07 RL |
1064 | /** |
1065 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1066 | * @lp: ptr to the fc_lport |
1067 | * | |
1068 | * Any permanently-disqualifying conditions have been previously checked. | |
1069 | * This also updates the speed setting, which may change with link for 100/1000. | |
1070 | * | |
1071 | * This function should probably be checking for PAUSE support at some point | |
1072 | * in the future. Currently Per-priority-pause is not determinable using | |
1073 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1074 | * | |
1075 | * Returns: 0 if link is OK for use by FCoE. | |
1076 | * | |
1077 | */ | |
1078 | int fcoe_link_ok(struct fc_lport *lp) | |
1079 | { | |
fc47ff6b | 1080 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 RL |
1081 | struct net_device *dev = fc->real_dev; |
1082 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; | |
1083 | int rc = 0; | |
1084 | ||
1085 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) { | |
1086 | dev = fc->phys_dev; | |
1087 | if (dev->ethtool_ops->get_settings) { | |
1088 | dev->ethtool_ops->get_settings(dev, &ecmd); | |
1089 | lp->link_supported_speeds &= | |
1090 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1091 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1092 | SUPPORTED_1000baseT_Full)) | |
1093 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1094 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1095 | lp->link_supported_speeds |= | |
1096 | FC_PORTSPEED_10GBIT; | |
1097 | if (ecmd.speed == SPEED_1000) | |
1098 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1099 | if (ecmd.speed == SPEED_10000) | |
1100 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
1101 | } | |
1102 | } else | |
1103 | rc = -1; | |
1104 | ||
1105 | return rc; | |
1106 | } | |
1107 | EXPORT_SYMBOL_GPL(fcoe_link_ok); | |
1108 | ||
34f42a07 RL |
1109 | /** |
1110 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 RL |
1111 | * @lp: the fc_lport |
1112 | */ | |
1113 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1114 | { | |
1115 | int idx; | |
1116 | struct fcoe_percpu_s *pp; | |
1117 | struct fcoe_rcv_info *fr; | |
1118 | struct sk_buff_head *list; | |
1119 | struct sk_buff *skb, *next; | |
1120 | struct sk_buff *head; | |
1121 | ||
1122 | for (idx = 0; idx < NR_CPUS; idx++) { | |
1123 | if (fcoe_percpu[idx]) { | |
1124 | pp = fcoe_percpu[idx]; | |
1125 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1126 | list = &pp->fcoe_rx_list; | |
1127 | head = list->next; | |
1128 | for (skb = head; skb != (struct sk_buff *)list; | |
1129 | skb = next) { | |
1130 | next = skb->next; | |
1131 | fr = fcoe_dev_from_skb(skb); | |
1132 | if (fr->fr_dev == lp) { | |
1133 | __skb_unlink(skb, list); | |
1134 | kfree_skb(skb); | |
1135 | } | |
1136 | } | |
1137 | spin_unlock_bh(&pp->fcoe_rx_list.lock); | |
1138 | } | |
1139 | } | |
1140 | } | |
1141 | EXPORT_SYMBOL_GPL(fcoe_percpu_clean); | |
1142 | ||
1143 | /** | |
34f42a07 | 1144 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1145 | * @lp: the corresponding fc_lport |
1146 | * | |
1147 | * Returns: none | |
34f42a07 | 1148 | */ |
85b4aa49 RL |
1149 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1150 | { | |
1151 | struct fcoe_softc *fc = lport_priv(lp); | |
1152 | struct sk_buff *skb; | |
1153 | ||
1154 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1155 | while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { | |
1156 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1157 | kfree_skb(skb); | |
1158 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1159 | } | |
1160 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1161 | } | |
1162 | EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue); | |
1163 | ||
1164 | /** | |
34f42a07 | 1165 | * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport |
85b4aa49 RL |
1166 | * @sht: ptr to the scsi host templ |
1167 | * @priv_size: size of private data after fc_lport | |
1168 | * | |
1169 | * Returns: ptr to Scsi_Host | |
34f42a07 | 1170 | * TODO: to libfc? |
85b4aa49 | 1171 | */ |
b2ab99c9 RL |
1172 | static inline struct Scsi_Host * |
1173 | libfc_host_alloc(struct scsi_host_template *sht, int priv_size) | |
85b4aa49 RL |
1174 | { |
1175 | return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size); | |
1176 | } | |
1177 | ||
1178 | /** | |
34f42a07 | 1179 | * fcoe_host_alloc() - Allocate a Scsi_Host with room for the fcoe_softc |
85b4aa49 RL |
1180 | * @sht: ptr to the scsi host templ |
1181 | * @priv_size: size of private data after fc_lport | |
1182 | * | |
1183 | * Returns: ptr to Scsi_Host | |
1184 | */ | |
1185 | struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size) | |
1186 | { | |
1187 | return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size); | |
1188 | } | |
1189 | EXPORT_SYMBOL_GPL(fcoe_host_alloc); | |
1190 | ||
34f42a07 RL |
1191 | /** |
1192 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
1193 | * @shost: shost the reset is from |
1194 | * | |
1195 | * Returns: always 0 | |
1196 | */ | |
1197 | int fcoe_reset(struct Scsi_Host *shost) | |
1198 | { | |
1199 | struct fc_lport *lport = shost_priv(shost); | |
1200 | fc_lport_reset(lport); | |
1201 | return 0; | |
1202 | } | |
1203 | EXPORT_SYMBOL_GPL(fcoe_reset); | |
1204 | ||
34f42a07 RL |
1205 | /** |
1206 | * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN. | |
85b4aa49 RL |
1207 | * @mac: mac address |
1208 | * @scheme: check port | |
1209 | * @port: port indicator for converting | |
1210 | * | |
1211 | * Returns: u64 fc world wide name | |
1212 | */ | |
1213 | u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN], | |
1214 | unsigned int scheme, unsigned int port) | |
1215 | { | |
1216 | u64 wwn; | |
1217 | u64 host_mac; | |
1218 | ||
1219 | /* The MAC is in NO, so flip only the low 48 bits */ | |
1220 | host_mac = ((u64) mac[0] << 40) | | |
1221 | ((u64) mac[1] << 32) | | |
1222 | ((u64) mac[2] << 24) | | |
1223 | ((u64) mac[3] << 16) | | |
1224 | ((u64) mac[4] << 8) | | |
1225 | (u64) mac[5]; | |
1226 | ||
1227 | WARN_ON(host_mac >= (1ULL << 48)); | |
1228 | wwn = host_mac | ((u64) scheme << 60); | |
1229 | switch (scheme) { | |
1230 | case 1: | |
1231 | WARN_ON(port != 0); | |
1232 | break; | |
1233 | case 2: | |
1234 | WARN_ON(port >= 0xfff); | |
1235 | wwn |= (u64) port << 48; | |
1236 | break; | |
1237 | default: | |
1238 | WARN_ON(1); | |
1239 | break; | |
1240 | } | |
1241 | ||
1242 | return wwn; | |
1243 | } | |
1244 | EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac); | |
34f42a07 RL |
1245 | |
1246 | /** | |
1247 | * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device | |
85b4aa49 RL |
1248 | * @device: this is currently ptr to net_device |
1249 | * | |
1250 | * Returns: NULL or the located fcoe_softc | |
1251 | */ | |
b2ab99c9 RL |
1252 | static struct fcoe_softc * |
1253 | fcoe_hostlist_lookup_softc(const struct net_device *dev) | |
85b4aa49 RL |
1254 | { |
1255 | struct fcoe_softc *fc; | |
1256 | ||
1257 | read_lock(&fcoe_hostlist_lock); | |
1258 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1259 | if (fc->real_dev == dev) { | |
1260 | read_unlock(&fcoe_hostlist_lock); | |
1261 | return fc; | |
1262 | } | |
1263 | } | |
1264 | read_unlock(&fcoe_hostlist_lock); | |
1265 | return NULL; | |
1266 | } | |
1267 | ||
34f42a07 RL |
1268 | /** |
1269 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
1270 | * @netdev: ptr to net_device |
1271 | * | |
1272 | * Returns: 0 for success | |
1273 | */ | |
1274 | struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) | |
1275 | { | |
1276 | struct fcoe_softc *fc; | |
1277 | ||
1278 | fc = fcoe_hostlist_lookup_softc(netdev); | |
1279 | ||
1280 | return (fc) ? fc->lp : NULL; | |
1281 | } | |
1282 | EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup); | |
1283 | ||
34f42a07 RL |
1284 | /** |
1285 | * fcoe_hostlist_add() - Add a lport to lports list | |
85b4aa49 RL |
1286 | * @lp: ptr to the fc_lport to badded |
1287 | * | |
1288 | * Returns: 0 for success | |
1289 | */ | |
1290 | int fcoe_hostlist_add(const struct fc_lport *lp) | |
1291 | { | |
1292 | struct fcoe_softc *fc; | |
1293 | ||
1294 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1295 | if (!fc) { | |
fc47ff6b | 1296 | fc = lport_priv(lp); |
85b4aa49 RL |
1297 | write_lock_bh(&fcoe_hostlist_lock); |
1298 | list_add_tail(&fc->list, &fcoe_hostlist); | |
1299 | write_unlock_bh(&fcoe_hostlist_lock); | |
1300 | } | |
1301 | return 0; | |
1302 | } | |
1303 | EXPORT_SYMBOL_GPL(fcoe_hostlist_add); | |
1304 | ||
34f42a07 RL |
1305 | /** |
1306 | * fcoe_hostlist_remove() - remove a lport from lports list | |
85b4aa49 RL |
1307 | * @lp: ptr to the fc_lport to badded |
1308 | * | |
1309 | * Returns: 0 for success | |
1310 | */ | |
1311 | int fcoe_hostlist_remove(const struct fc_lport *lp) | |
1312 | { | |
1313 | struct fcoe_softc *fc; | |
1314 | ||
1315 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1316 | BUG_ON(!fc); | |
1317 | write_lock_bh(&fcoe_hostlist_lock); | |
1318 | list_del(&fc->list); | |
1319 | write_unlock_bh(&fcoe_hostlist_lock); | |
1320 | ||
1321 | return 0; | |
1322 | } | |
1323 | EXPORT_SYMBOL_GPL(fcoe_hostlist_remove); | |
1324 | ||
1325 | /** | |
34f42a07 | 1326 | * fcoe_libfc_config() - sets up libfc related properties for lport |
85b4aa49 RL |
1327 | * @lp: ptr to the fc_lport |
1328 | * @tt: libfc function template | |
1329 | * | |
1330 | * Returns : 0 for success | |
34f42a07 | 1331 | */ |
85b4aa49 RL |
1332 | int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt) |
1333 | { | |
1334 | /* Set the function pointers set by the LLDD */ | |
1335 | memcpy(&lp->tt, tt, sizeof(*tt)); | |
1336 | if (fc_fcp_init(lp)) | |
1337 | return -ENOMEM; | |
1338 | fc_exch_init(lp); | |
1339 | fc_elsct_init(lp); | |
1340 | fc_lport_init(lp); | |
1341 | fc_rport_init(lp); | |
1342 | fc_disc_init(lp); | |
1343 | ||
1344 | return 0; | |
1345 | } | |
1346 | EXPORT_SYMBOL_GPL(fcoe_libfc_config); | |
1347 | ||
1348 | /** | |
34f42a07 | 1349 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 RL |
1350 | * |
1351 | * Initialization routine | |
1352 | * 1. Will create fc transport software structure | |
1353 | * 2. initialize the link list of port information structure | |
1354 | * | |
1355 | * Returns 0 on success, negative on failure | |
34f42a07 | 1356 | */ |
85b4aa49 RL |
1357 | static int __init fcoe_init(void) |
1358 | { | |
1359 | int cpu; | |
1360 | struct fcoe_percpu_s *p; | |
1361 | ||
1362 | ||
1363 | INIT_LIST_HEAD(&fcoe_hostlist); | |
1364 | rwlock_init(&fcoe_hostlist_lock); | |
1365 | ||
1366 | #ifdef CONFIG_HOTPLUG_CPU | |
1367 | register_cpu_notifier(&fcoe_cpu_notifier); | |
1368 | #endif /* CONFIG_HOTPLUG_CPU */ | |
1369 | ||
1370 | /* | |
1371 | * initialize per CPU interrupt thread | |
1372 | */ | |
1373 | for_each_online_cpu(cpu) { | |
1374 | p = kzalloc(sizeof(struct fcoe_percpu_s), GFP_KERNEL); | |
1375 | if (p) { | |
1376 | p->thread = kthread_create(fcoe_percpu_receive_thread, | |
1377 | (void *)p, | |
1378 | "fcoethread/%d", cpu); | |
1379 | ||
1380 | /* | |
1381 | * if there is no error then bind the thread to the cpu | |
1382 | * initialize the semaphore and skb queue head | |
1383 | */ | |
1384 | if (likely(!IS_ERR(p->thread))) { | |
1385 | p->cpu = cpu; | |
1386 | fcoe_percpu[cpu] = p; | |
1387 | skb_queue_head_init(&p->fcoe_rx_list); | |
1388 | kthread_bind(p->thread, cpu); | |
1389 | wake_up_process(p->thread); | |
1390 | } else { | |
1391 | fcoe_percpu[cpu] = NULL; | |
1392 | kfree(p); | |
85b4aa49 RL |
1393 | } |
1394 | } | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * setup link change notification | |
1399 | */ | |
1400 | fcoe_dev_setup(); | |
1401 | ||
a468f328 RL |
1402 | setup_timer(&fcoe_timer, fcoe_watchdog, 0); |
1403 | ||
1404 | mod_timer(&fcoe_timer, jiffies + (10 * HZ)); | |
85b4aa49 RL |
1405 | |
1406 | /* initiatlize the fcoe transport */ | |
1407 | fcoe_transport_init(); | |
1408 | ||
1409 | fcoe_sw_init(); | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | module_init(fcoe_init); | |
1414 | ||
1415 | /** | |
34f42a07 | 1416 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
1417 | * |
1418 | * Returns 0 on success, negative on failure | |
34f42a07 | 1419 | */ |
85b4aa49 RL |
1420 | static void __exit fcoe_exit(void) |
1421 | { | |
1422 | u32 idx; | |
1423 | struct fcoe_softc *fc, *tmp; | |
1424 | struct fcoe_percpu_s *p; | |
1425 | struct sk_buff *skb; | |
1426 | ||
1427 | /* | |
1428 | * Stop all call back interfaces | |
1429 | */ | |
1430 | #ifdef CONFIG_HOTPLUG_CPU | |
1431 | unregister_cpu_notifier(&fcoe_cpu_notifier); | |
1432 | #endif /* CONFIG_HOTPLUG_CPU */ | |
1433 | fcoe_dev_cleanup(); | |
1434 | ||
1435 | /* | |
1436 | * stop timer | |
1437 | */ | |
1438 | del_timer_sync(&fcoe_timer); | |
1439 | ||
b2ab99c9 | 1440 | /* releases the associated fcoe transport for each lport */ |
85b4aa49 RL |
1441 | list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
1442 | fcoe_transport_release(fc->real_dev); | |
1443 | ||
1444 | for (idx = 0; idx < NR_CPUS; idx++) { | |
1445 | if (fcoe_percpu[idx]) { | |
1446 | kthread_stop(fcoe_percpu[idx]->thread); | |
1447 | p = fcoe_percpu[idx]; | |
1448 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1449 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
1450 | kfree_skb(skb); | |
1451 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1452 | if (fcoe_percpu[idx]->crc_eof_page) | |
1453 | put_page(fcoe_percpu[idx]->crc_eof_page); | |
1454 | kfree(fcoe_percpu[idx]); | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | /* remove sw trasnport */ | |
1459 | fcoe_sw_exit(); | |
1460 | ||
1461 | /* detach the transport */ | |
1462 | fcoe_transport_exit(); | |
1463 | } | |
1464 | module_exit(fcoe_exit); |