Commit | Line | Data |
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fdecf31b YZ |
1 | /* |
2 | * Copyright(c) 2008 - 2011 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/types.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/errno.h> | |
8597ae8b | 26 | #include <linux/crc32.h> |
fdecf31b YZ |
27 | #include <scsi/libfcoe.h> |
28 | ||
29 | #include "libfcoe.h" | |
30 | ||
e01efc33 YZ |
31 | MODULE_AUTHOR("Open-FCoE.org"); |
32 | MODULE_DESCRIPTION("FIP discovery protocol and FCoE transport for FCoE HBAs"); | |
33 | MODULE_LICENSE("GPL v2"); | |
34 | ||
fdecf31b YZ |
35 | static int fcoe_transport_create(const char *, struct kernel_param *); |
36 | static int fcoe_transport_destroy(const char *, struct kernel_param *); | |
37 | static int fcoe_transport_show(char *buffer, const struct kernel_param *kp); | |
38 | static struct fcoe_transport *fcoe_transport_lookup(struct net_device *device); | |
39 | static struct fcoe_transport *fcoe_netdev_map_lookup(struct net_device *device); | |
40 | static int fcoe_transport_enable(const char *, struct kernel_param *); | |
41 | static int fcoe_transport_disable(const char *, struct kernel_param *); | |
70be6344 BPG |
42 | static int libfcoe_device_notification(struct notifier_block *notifier, |
43 | ulong event, void *ptr); | |
fdecf31b YZ |
44 | |
45 | static LIST_HEAD(fcoe_transports); | |
fdecf31b | 46 | static DEFINE_MUTEX(ft_mutex); |
70be6344 BPG |
47 | static LIST_HEAD(fcoe_netdevs); |
48 | static DEFINE_MUTEX(fn_mutex); | |
fdecf31b | 49 | |
e01efc33 YZ |
50 | unsigned int libfcoe_debug_logging; |
51 | module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR); | |
52 | MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); | |
53 | ||
fdecf31b YZ |
54 | module_param_call(show, NULL, fcoe_transport_show, NULL, S_IRUSR); |
55 | __MODULE_PARM_TYPE(show, "string"); | |
56 | MODULE_PARM_DESC(show, " Show attached FCoE transports"); | |
57 | ||
58 | module_param_call(create, fcoe_transport_create, NULL, | |
59 | (void *)FIP_MODE_FABRIC, S_IWUSR); | |
60 | __MODULE_PARM_TYPE(create, "string"); | |
61 | MODULE_PARM_DESC(create, " Creates fcoe instance on a ethernet interface"); | |
62 | ||
63 | module_param_call(create_vn2vn, fcoe_transport_create, NULL, | |
64 | (void *)FIP_MODE_VN2VN, S_IWUSR); | |
65 | __MODULE_PARM_TYPE(create_vn2vn, "string"); | |
66 | MODULE_PARM_DESC(create_vn2vn, " Creates a VN_node to VN_node FCoE instance " | |
67 | "on an Ethernet interface"); | |
68 | ||
69 | module_param_call(destroy, fcoe_transport_destroy, NULL, NULL, S_IWUSR); | |
70 | __MODULE_PARM_TYPE(destroy, "string"); | |
71 | MODULE_PARM_DESC(destroy, " Destroys fcoe instance on a ethernet interface"); | |
72 | ||
73 | module_param_call(enable, fcoe_transport_enable, NULL, NULL, S_IWUSR); | |
74 | __MODULE_PARM_TYPE(enable, "string"); | |
75 | MODULE_PARM_DESC(enable, " Enables fcoe on a ethernet interface."); | |
76 | ||
77 | module_param_call(disable, fcoe_transport_disable, NULL, NULL, S_IWUSR); | |
78 | __MODULE_PARM_TYPE(disable, "string"); | |
79 | MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface."); | |
80 | ||
70be6344 BPG |
81 | /* notification function for packets from net device */ |
82 | static struct notifier_block libfcoe_notifier = { | |
83 | .notifier_call = libfcoe_device_notification, | |
84 | }; | |
85 | ||
814740d5 BPG |
86 | void __fcoe_get_lesb(struct fc_lport *lport, |
87 | struct fc_els_lesb *fc_lesb, | |
88 | struct net_device *netdev) | |
89 | { | |
90 | unsigned int cpu; | |
91 | u32 lfc, vlfc, mdac; | |
92 | struct fcoe_dev_stats *devst; | |
93 | struct fcoe_fc_els_lesb *lesb; | |
94 | struct rtnl_link_stats64 temp; | |
95 | ||
96 | lfc = 0; | |
97 | vlfc = 0; | |
98 | mdac = 0; | |
99 | lesb = (struct fcoe_fc_els_lesb *)fc_lesb; | |
100 | memset(lesb, 0, sizeof(*lesb)); | |
101 | for_each_possible_cpu(cpu) { | |
102 | devst = per_cpu_ptr(lport->dev_stats, cpu); | |
103 | lfc += devst->LinkFailureCount; | |
104 | vlfc += devst->VLinkFailureCount; | |
105 | mdac += devst->MissDiscAdvCount; | |
106 | } | |
107 | lesb->lesb_link_fail = htonl(lfc); | |
108 | lesb->lesb_vlink_fail = htonl(vlfc); | |
109 | lesb->lesb_miss_fka = htonl(mdac); | |
110 | lesb->lesb_fcs_error = | |
111 | htonl(dev_get_stats(netdev, &temp)->rx_crc_errors); | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(__fcoe_get_lesb); | |
114 | ||
d834895c BPG |
115 | void fcoe_wwn_to_str(u64 wwn, char *buf, int len) |
116 | { | |
117 | u8 wwpn[8]; | |
118 | ||
119 | u64_to_wwn(wwn, wwpn); | |
120 | snprintf(buf, len, "%02x%02x%02x%02x%02x%02x%02x%02x", | |
121 | wwpn[0], wwpn[1], wwpn[2], wwpn[3], | |
122 | wwpn[4], wwpn[5], wwpn[6], wwpn[7]); | |
123 | } | |
124 | EXPORT_SYMBOL_GPL(fcoe_wwn_to_str); | |
125 | ||
126 | /** | |
127 | * fcoe_validate_vport_create() - Validate a vport before creating it | |
128 | * @vport: NPIV port to be created | |
129 | * | |
130 | * This routine is meant to add validation for a vport before creating it | |
131 | * via fcoe_vport_create(). | |
132 | * Current validations are: | |
133 | * - WWPN supplied is unique for given lport | |
134 | */ | |
135 | int fcoe_validate_vport_create(struct fc_vport *vport) | |
136 | { | |
137 | struct Scsi_Host *shost = vport_to_shost(vport); | |
138 | struct fc_lport *n_port = shost_priv(shost); | |
139 | struct fc_lport *vn_port; | |
140 | int rc = 0; | |
141 | char buf[32]; | |
142 | ||
143 | mutex_lock(&n_port->lp_mutex); | |
144 | ||
145 | fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf)); | |
146 | /* Check if the wwpn is not same as that of the lport */ | |
147 | if (!memcmp(&n_port->wwpn, &vport->port_name, sizeof(u64))) { | |
148 | LIBFCOE_TRANSPORT_DBG("vport WWPN 0x%s is same as that of the " | |
149 | "base port WWPN\n", buf); | |
150 | rc = -EINVAL; | |
151 | goto out; | |
152 | } | |
153 | ||
154 | /* Check if there is any existing vport with same wwpn */ | |
155 | list_for_each_entry(vn_port, &n_port->vports, list) { | |
156 | if (!memcmp(&vn_port->wwpn, &vport->port_name, sizeof(u64))) { | |
157 | LIBFCOE_TRANSPORT_DBG("vport with given WWPN 0x%s " | |
158 | "already exists\n", buf); | |
159 | rc = -EINVAL; | |
160 | break; | |
161 | } | |
162 | } | |
163 | out: | |
164 | mutex_unlock(&n_port->lp_mutex); | |
165 | return rc; | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(fcoe_validate_vport_create); | |
168 | ||
169 | /** | |
170 | * fcoe_get_wwn() - Get the world wide name from LLD if it supports it | |
171 | * @netdev: the associated net device | |
172 | * @wwn: the output WWN | |
173 | * @type: the type of WWN (WWPN or WWNN) | |
174 | * | |
175 | * Returns: 0 for success | |
176 | */ | |
177 | int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type) | |
178 | { | |
179 | const struct net_device_ops *ops = netdev->netdev_ops; | |
180 | ||
181 | if (ops->ndo_fcoe_get_wwn) | |
182 | return ops->ndo_fcoe_get_wwn(netdev, wwn, type); | |
183 | return -EINVAL; | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(fcoe_get_wwn); | |
186 | ||
8597ae8b BPG |
187 | /** |
188 | * fcoe_fc_crc() - Calculates the CRC for a given frame | |
189 | * @fp: The frame to be checksumed | |
190 | * | |
191 | * This uses crc32() routine to calculate the CRC for a frame | |
192 | * | |
193 | * Return: The 32 bit CRC value | |
194 | */ | |
195 | u32 fcoe_fc_crc(struct fc_frame *fp) | |
196 | { | |
197 | struct sk_buff *skb = fp_skb(fp); | |
198 | struct skb_frag_struct *frag; | |
199 | unsigned char *data; | |
200 | unsigned long off, len, clen; | |
201 | u32 crc; | |
202 | unsigned i; | |
203 | ||
204 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
205 | ||
206 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
207 | frag = &skb_shinfo(skb)->frags[i]; | |
208 | off = frag->page_offset; | |
9e903e08 | 209 | len = skb_frag_size(frag); |
8597ae8b BPG |
210 | while (len > 0) { |
211 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
165c68d5 | 212 | data = kmap_atomic( |
77dfce07 | 213 | skb_frag_page(frag) + (off >> PAGE_SHIFT)); |
8597ae8b | 214 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); |
77dfce07 | 215 | kunmap_atomic(data); |
8597ae8b BPG |
216 | off += clen; |
217 | len -= clen; | |
218 | } | |
219 | } | |
220 | return crc; | |
221 | } | |
222 | EXPORT_SYMBOL_GPL(fcoe_fc_crc); | |
223 | ||
224 | /** | |
225 | * fcoe_start_io() - Start FCoE I/O | |
226 | * @skb: The packet to be transmitted | |
227 | * | |
228 | * This routine is called from the net device to start transmitting | |
229 | * FCoE packets. | |
230 | * | |
231 | * Returns: 0 for success | |
232 | */ | |
233 | int fcoe_start_io(struct sk_buff *skb) | |
234 | { | |
235 | struct sk_buff *nskb; | |
236 | int rc; | |
237 | ||
238 | nskb = skb_clone(skb, GFP_ATOMIC); | |
239 | if (!nskb) | |
240 | return -ENOMEM; | |
241 | rc = dev_queue_xmit(nskb); | |
242 | if (rc != 0) | |
243 | return rc; | |
244 | kfree_skb(skb); | |
245 | return 0; | |
246 | } | |
247 | EXPORT_SYMBOL_GPL(fcoe_start_io); | |
248 | ||
249 | ||
250 | /** | |
251 | * fcoe_clean_pending_queue() - Dequeue a skb and free it | |
252 | * @lport: The local port to dequeue a skb on | |
253 | */ | |
254 | void fcoe_clean_pending_queue(struct fc_lport *lport) | |
255 | { | |
256 | struct fcoe_port *port = lport_priv(lport); | |
257 | struct sk_buff *skb; | |
258 | ||
259 | spin_lock_bh(&port->fcoe_pending_queue.lock); | |
260 | while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) { | |
261 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
262 | kfree_skb(skb); | |
263 | spin_lock_bh(&port->fcoe_pending_queue.lock); | |
264 | } | |
265 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue); | |
268 | ||
269 | /** | |
270 | * fcoe_check_wait_queue() - Attempt to clear the transmit backlog | |
271 | * @lport: The local port whose backlog is to be cleared | |
272 | * | |
273 | * This empties the wait_queue, dequeues the head of the wait_queue queue | |
274 | * and calls fcoe_start_io() for each packet. If all skb have been | |
275 | * transmitted it returns the qlen. If an error occurs it restores | |
276 | * wait_queue (to try again later) and returns -1. | |
277 | * | |
278 | * The wait_queue is used when the skb transmit fails. The failed skb | |
279 | * will go in the wait_queue which will be emptied by the timer function or | |
280 | * by the next skb transmit. | |
281 | */ | |
282 | void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb) | |
283 | { | |
284 | struct fcoe_port *port = lport_priv(lport); | |
285 | int rc; | |
286 | ||
287 | spin_lock_bh(&port->fcoe_pending_queue.lock); | |
288 | ||
289 | if (skb) | |
290 | __skb_queue_tail(&port->fcoe_pending_queue, skb); | |
291 | ||
292 | if (port->fcoe_pending_queue_active) | |
293 | goto out; | |
294 | port->fcoe_pending_queue_active = 1; | |
295 | ||
296 | while (port->fcoe_pending_queue.qlen) { | |
297 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
298 | port->fcoe_pending_queue.qlen++; | |
299 | skb = __skb_dequeue(&port->fcoe_pending_queue); | |
300 | ||
301 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
302 | rc = fcoe_start_io(skb); | |
303 | spin_lock_bh(&port->fcoe_pending_queue.lock); | |
304 | ||
305 | if (rc) { | |
306 | __skb_queue_head(&port->fcoe_pending_queue, skb); | |
307 | /* undo temporary increment above */ | |
308 | port->fcoe_pending_queue.qlen--; | |
309 | break; | |
310 | } | |
311 | /* undo temporary increment above */ | |
312 | port->fcoe_pending_queue.qlen--; | |
313 | } | |
314 | ||
315 | if (port->fcoe_pending_queue.qlen < port->min_queue_depth) | |
316 | lport->qfull = 0; | |
317 | if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer)) | |
318 | mod_timer(&port->timer, jiffies + 2); | |
319 | port->fcoe_pending_queue_active = 0; | |
320 | out: | |
321 | if (port->fcoe_pending_queue.qlen > port->max_queue_depth) | |
322 | lport->qfull = 1; | |
323 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
324 | } | |
325 | EXPORT_SYMBOL_GPL(fcoe_check_wait_queue); | |
326 | ||
327 | /** | |
328 | * fcoe_queue_timer() - The fcoe queue timer | |
329 | * @lport: The local port | |
330 | * | |
331 | * Calls fcoe_check_wait_queue on timeout | |
332 | */ | |
333 | void fcoe_queue_timer(ulong lport) | |
334 | { | |
335 | fcoe_check_wait_queue((struct fc_lport *)lport, NULL); | |
336 | } | |
337 | EXPORT_SYMBOL_GPL(fcoe_queue_timer); | |
338 | ||
339 | /** | |
340 | * fcoe_get_paged_crc_eof() - Allocate a page to be used for the trailer CRC | |
341 | * @skb: The packet to be transmitted | |
342 | * @tlen: The total length of the trailer | |
343 | * @fps: The fcoe context | |
344 | * | |
345 | * This routine allocates a page for frame trailers. The page is re-used if | |
346 | * there is enough room left on it for the current trailer. If there isn't | |
347 | * enough buffer left a new page is allocated for the trailer. Reference to | |
348 | * the page from this function as well as the skbs using the page fragments | |
349 | * ensure that the page is freed at the appropriate time. | |
350 | * | |
351 | * Returns: 0 for success | |
352 | */ | |
353 | int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen, | |
354 | struct fcoe_percpu_s *fps) | |
355 | { | |
356 | struct page *page; | |
357 | ||
358 | page = fps->crc_eof_page; | |
359 | if (!page) { | |
360 | page = alloc_page(GFP_ATOMIC); | |
361 | if (!page) | |
362 | return -ENOMEM; | |
363 | ||
364 | fps->crc_eof_page = page; | |
365 | fps->crc_eof_offset = 0; | |
366 | } | |
367 | ||
368 | get_page(page); | |
369 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
370 | fps->crc_eof_offset, tlen); | |
371 | skb->len += tlen; | |
372 | skb->data_len += tlen; | |
373 | skb->truesize += tlen; | |
374 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
375 | ||
376 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
377 | fps->crc_eof_page = NULL; | |
378 | fps->crc_eof_offset = 0; | |
379 | put_page(page); | |
380 | } | |
381 | ||
382 | return 0; | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(fcoe_get_paged_crc_eof); | |
385 | ||
fdecf31b YZ |
386 | /** |
387 | * fcoe_transport_lookup - find an fcoe transport that matches a netdev | |
388 | * @netdev: The netdev to look for from all attached transports | |
389 | * | |
390 | * Returns : ptr to the fcoe transport that supports this netdev or NULL | |
391 | * if not found. | |
392 | * | |
393 | * The ft_mutex should be held when this is called | |
394 | */ | |
395 | static struct fcoe_transport *fcoe_transport_lookup(struct net_device *netdev) | |
396 | { | |
397 | struct fcoe_transport *ft = NULL; | |
398 | ||
399 | list_for_each_entry(ft, &fcoe_transports, list) | |
400 | if (ft->match && ft->match(netdev)) | |
401 | return ft; | |
402 | return NULL; | |
403 | } | |
404 | ||
405 | /** | |
406 | * fcoe_transport_attach - Attaches an FCoE transport | |
407 | * @ft: The fcoe transport to be attached | |
408 | * | |
409 | * Returns : 0 for success | |
410 | */ | |
411 | int fcoe_transport_attach(struct fcoe_transport *ft) | |
412 | { | |
413 | int rc = 0; | |
414 | ||
415 | mutex_lock(&ft_mutex); | |
416 | if (ft->attached) { | |
417 | LIBFCOE_TRANSPORT_DBG("transport %s already attached\n", | |
418 | ft->name); | |
419 | rc = -EEXIST; | |
420 | goto out_attach; | |
421 | } | |
422 | ||
423 | /* Add default transport to the tail */ | |
424 | if (strcmp(ft->name, FCOE_TRANSPORT_DEFAULT)) | |
425 | list_add(&ft->list, &fcoe_transports); | |
426 | else | |
427 | list_add_tail(&ft->list, &fcoe_transports); | |
428 | ||
429 | ft->attached = true; | |
430 | LIBFCOE_TRANSPORT_DBG("attaching transport %s\n", ft->name); | |
431 | ||
432 | out_attach: | |
433 | mutex_unlock(&ft_mutex); | |
434 | return rc; | |
435 | } | |
436 | EXPORT_SYMBOL(fcoe_transport_attach); | |
437 | ||
438 | /** | |
4ef7fb15 | 439 | * fcoe_transport_detach - Detaches an FCoE transport |
fdecf31b YZ |
440 | * @ft: The fcoe transport to be attached |
441 | * | |
442 | * Returns : 0 for success | |
443 | */ | |
444 | int fcoe_transport_detach(struct fcoe_transport *ft) | |
445 | { | |
446 | int rc = 0; | |
69922fcd | 447 | struct fcoe_netdev_mapping *nm = NULL, *tmp; |
fdecf31b YZ |
448 | |
449 | mutex_lock(&ft_mutex); | |
450 | if (!ft->attached) { | |
451 | LIBFCOE_TRANSPORT_DBG("transport %s already detached\n", | |
452 | ft->name); | |
453 | rc = -ENODEV; | |
454 | goto out_attach; | |
455 | } | |
456 | ||
69922fcd YZ |
457 | /* remove netdev mapping for this transport as it is going away */ |
458 | mutex_lock(&fn_mutex); | |
459 | list_for_each_entry_safe(nm, tmp, &fcoe_netdevs, list) { | |
460 | if (nm->ft == ft) { | |
461 | LIBFCOE_TRANSPORT_DBG("transport %s going away, " | |
462 | "remove its netdev mapping for %s\n", | |
463 | ft->name, nm->netdev->name); | |
464 | list_del(&nm->list); | |
465 | kfree(nm); | |
466 | } | |
467 | } | |
468 | mutex_unlock(&fn_mutex); | |
469 | ||
fdecf31b YZ |
470 | list_del(&ft->list); |
471 | ft->attached = false; | |
472 | LIBFCOE_TRANSPORT_DBG("detaching transport %s\n", ft->name); | |
473 | ||
474 | out_attach: | |
475 | mutex_unlock(&ft_mutex); | |
476 | return rc; | |
477 | ||
478 | } | |
479 | EXPORT_SYMBOL(fcoe_transport_detach); | |
480 | ||
481 | static int fcoe_transport_show(char *buffer, const struct kernel_param *kp) | |
482 | { | |
483 | int i, j; | |
484 | struct fcoe_transport *ft = NULL; | |
485 | ||
486 | i = j = sprintf(buffer, "Attached FCoE transports:"); | |
487 | mutex_lock(&ft_mutex); | |
488 | list_for_each_entry(ft, &fcoe_transports, list) { | |
a01a5a57 | 489 | if (i >= PAGE_SIZE - IFNAMSIZ) |
fdecf31b | 490 | break; |
a01a5a57 | 491 | i += snprintf(&buffer[i], IFNAMSIZ, "%s ", ft->name); |
fdecf31b YZ |
492 | } |
493 | mutex_unlock(&ft_mutex); | |
494 | if (i == j) | |
495 | i += snprintf(&buffer[i], IFNAMSIZ, "none"); | |
496 | return i; | |
497 | } | |
498 | ||
499 | static int __init fcoe_transport_init(void) | |
500 | { | |
70be6344 | 501 | register_netdevice_notifier(&libfcoe_notifier); |
fdecf31b YZ |
502 | return 0; |
503 | } | |
504 | ||
505 | static int __exit fcoe_transport_exit(void) | |
506 | { | |
507 | struct fcoe_transport *ft; | |
508 | ||
70be6344 | 509 | unregister_netdevice_notifier(&libfcoe_notifier); |
fdecf31b YZ |
510 | mutex_lock(&ft_mutex); |
511 | list_for_each_entry(ft, &fcoe_transports, list) | |
512 | printk(KERN_ERR "FCoE transport %s is still attached!\n", | |
513 | ft->name); | |
514 | mutex_unlock(&ft_mutex); | |
515 | return 0; | |
516 | } | |
517 | ||
518 | ||
519 | static int fcoe_add_netdev_mapping(struct net_device *netdev, | |
520 | struct fcoe_transport *ft) | |
521 | { | |
522 | struct fcoe_netdev_mapping *nm; | |
523 | ||
524 | nm = kmalloc(sizeof(*nm), GFP_KERNEL); | |
525 | if (!nm) { | |
526 | printk(KERN_ERR "Unable to allocate netdev_mapping"); | |
527 | return -ENOMEM; | |
528 | } | |
529 | ||
530 | nm->netdev = netdev; | |
531 | nm->ft = ft; | |
532 | ||
70be6344 | 533 | mutex_lock(&fn_mutex); |
fdecf31b | 534 | list_add(&nm->list, &fcoe_netdevs); |
70be6344 | 535 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
536 | return 0; |
537 | } | |
538 | ||
539 | ||
540 | static void fcoe_del_netdev_mapping(struct net_device *netdev) | |
541 | { | |
542 | struct fcoe_netdev_mapping *nm = NULL, *tmp; | |
543 | ||
70be6344 | 544 | mutex_lock(&fn_mutex); |
fdecf31b YZ |
545 | list_for_each_entry_safe(nm, tmp, &fcoe_netdevs, list) { |
546 | if (nm->netdev == netdev) { | |
547 | list_del(&nm->list); | |
548 | kfree(nm); | |
70be6344 | 549 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
550 | return; |
551 | } | |
552 | } | |
70be6344 | 553 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
554 | } |
555 | ||
556 | ||
557 | /** | |
558 | * fcoe_netdev_map_lookup - find the fcoe transport that matches the netdev on which | |
559 | * it was created | |
560 | * | |
561 | * Returns : ptr to the fcoe transport that supports this netdev or NULL | |
562 | * if not found. | |
563 | * | |
564 | * The ft_mutex should be held when this is called | |
565 | */ | |
566 | static struct fcoe_transport *fcoe_netdev_map_lookup(struct net_device *netdev) | |
567 | { | |
568 | struct fcoe_transport *ft = NULL; | |
569 | struct fcoe_netdev_mapping *nm; | |
570 | ||
70be6344 | 571 | mutex_lock(&fn_mutex); |
fdecf31b YZ |
572 | list_for_each_entry(nm, &fcoe_netdevs, list) { |
573 | if (netdev == nm->netdev) { | |
574 | ft = nm->ft; | |
70be6344 | 575 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
576 | return ft; |
577 | } | |
578 | } | |
579 | ||
70be6344 | 580 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
581 | return NULL; |
582 | } | |
583 | ||
584 | /** | |
585 | * fcoe_if_to_netdev() - Parse a name buffer to get a net device | |
586 | * @buffer: The name of the net device | |
587 | * | |
588 | * Returns: NULL or a ptr to net_device | |
589 | */ | |
590 | static struct net_device *fcoe_if_to_netdev(const char *buffer) | |
591 | { | |
592 | char *cp; | |
593 | char ifname[IFNAMSIZ + 2]; | |
594 | ||
595 | if (buffer) { | |
596 | strlcpy(ifname, buffer, IFNAMSIZ); | |
597 | cp = ifname + strlen(ifname); | |
598 | while (--cp >= ifname && *cp == '\n') | |
599 | *cp = '\0'; | |
600 | return dev_get_by_name(&init_net, ifname); | |
601 | } | |
602 | return NULL; | |
603 | } | |
604 | ||
70be6344 BPG |
605 | /** |
606 | * libfcoe_device_notification() - Handler for net device events | |
607 | * @notifier: The context of the notification | |
608 | * @event: The type of event | |
609 | * @ptr: The net device that the event was on | |
610 | * | |
611 | * This function is called by the Ethernet driver in case of link change event. | |
612 | * | |
613 | * Returns: 0 for success | |
614 | */ | |
615 | static int libfcoe_device_notification(struct notifier_block *notifier, | |
616 | ulong event, void *ptr) | |
617 | { | |
618 | struct net_device *netdev = ptr; | |
619 | ||
620 | switch (event) { | |
621 | case NETDEV_UNREGISTER: | |
b99fbf6a RL |
622 | LIBFCOE_TRANSPORT_DBG("NETDEV_UNREGISTER %s\n", |
623 | netdev->name); | |
70be6344 BPG |
624 | fcoe_del_netdev_mapping(netdev); |
625 | break; | |
626 | } | |
627 | return NOTIFY_OK; | |
628 | } | |
629 | ||
630 | ||
fdecf31b YZ |
631 | /** |
632 | * fcoe_transport_create() - Create a fcoe interface | |
633 | * @buffer: The name of the Ethernet interface to create on | |
634 | * @kp: The associated kernel param | |
635 | * | |
636 | * Called from sysfs. This holds the ft_mutex while calling the | |
637 | * registered fcoe transport's create function. | |
638 | * | |
639 | * Returns: 0 for success | |
640 | */ | |
641 | static int fcoe_transport_create(const char *buffer, struct kernel_param *kp) | |
642 | { | |
643 | int rc = -ENODEV; | |
644 | struct net_device *netdev = NULL; | |
645 | struct fcoe_transport *ft = NULL; | |
646 | enum fip_state fip_mode = (enum fip_state)(long)kp->arg; | |
647 | ||
b3960afe RL |
648 | mutex_lock(&ft_mutex); |
649 | ||
fdecf31b YZ |
650 | netdev = fcoe_if_to_netdev(buffer); |
651 | if (!netdev) { | |
652 | LIBFCOE_TRANSPORT_DBG("Invalid device %s.\n", buffer); | |
653 | goto out_nodev; | |
654 | } | |
655 | ||
656 | ft = fcoe_netdev_map_lookup(netdev); | |
657 | if (ft) { | |
658 | LIBFCOE_TRANSPORT_DBG("transport %s already has existing " | |
659 | "FCoE instance on %s.\n", | |
660 | ft->name, netdev->name); | |
661 | rc = -EEXIST; | |
662 | goto out_putdev; | |
663 | } | |
664 | ||
665 | ft = fcoe_transport_lookup(netdev); | |
666 | if (!ft) { | |
667 | LIBFCOE_TRANSPORT_DBG("no FCoE transport found for %s.\n", | |
668 | netdev->name); | |
669 | goto out_putdev; | |
670 | } | |
671 | ||
672 | rc = fcoe_add_netdev_mapping(netdev, ft); | |
673 | if (rc) { | |
674 | LIBFCOE_TRANSPORT_DBG("failed to add new netdev mapping " | |
675 | "for FCoE transport %s for %s.\n", | |
676 | ft->name, netdev->name); | |
677 | goto out_putdev; | |
678 | } | |
679 | ||
680 | /* pass to transport create */ | |
681 | rc = ft->create ? ft->create(netdev, fip_mode) : -ENODEV; | |
682 | if (rc) | |
683 | fcoe_del_netdev_mapping(netdev); | |
684 | ||
685 | LIBFCOE_TRANSPORT_DBG("transport %s %s to create fcoe on %s.\n", | |
686 | ft->name, (rc) ? "failed" : "succeeded", | |
687 | netdev->name); | |
688 | ||
689 | out_putdev: | |
690 | dev_put(netdev); | |
691 | out_nodev: | |
692 | mutex_unlock(&ft_mutex); | |
b3960afe | 693 | return rc; |
fdecf31b YZ |
694 | } |
695 | ||
696 | /** | |
697 | * fcoe_transport_destroy() - Destroy a FCoE interface | |
698 | * @buffer: The name of the Ethernet interface to be destroyed | |
699 | * @kp: The associated kernel parameter | |
700 | * | |
701 | * Called from sysfs. This holds the ft_mutex while calling the | |
702 | * registered fcoe transport's destroy function. | |
703 | * | |
704 | * Returns: 0 for success | |
705 | */ | |
706 | static int fcoe_transport_destroy(const char *buffer, struct kernel_param *kp) | |
707 | { | |
708 | int rc = -ENODEV; | |
709 | struct net_device *netdev = NULL; | |
710 | struct fcoe_transport *ft = NULL; | |
711 | ||
b3960afe RL |
712 | mutex_lock(&ft_mutex); |
713 | ||
fdecf31b YZ |
714 | netdev = fcoe_if_to_netdev(buffer); |
715 | if (!netdev) { | |
716 | LIBFCOE_TRANSPORT_DBG("invalid device %s.\n", buffer); | |
717 | goto out_nodev; | |
718 | } | |
719 | ||
720 | ft = fcoe_netdev_map_lookup(netdev); | |
721 | if (!ft) { | |
722 | LIBFCOE_TRANSPORT_DBG("no FCoE transport found for %s.\n", | |
723 | netdev->name); | |
724 | goto out_putdev; | |
725 | } | |
726 | ||
727 | /* pass to transport destroy */ | |
728 | rc = ft->destroy ? ft->destroy(netdev) : -ENODEV; | |
729 | fcoe_del_netdev_mapping(netdev); | |
730 | LIBFCOE_TRANSPORT_DBG("transport %s %s to destroy fcoe on %s.\n", | |
731 | ft->name, (rc) ? "failed" : "succeeded", | |
732 | netdev->name); | |
733 | ||
734 | out_putdev: | |
735 | dev_put(netdev); | |
736 | out_nodev: | |
737 | mutex_unlock(&ft_mutex); | |
b3960afe | 738 | return rc; |
fdecf31b YZ |
739 | } |
740 | ||
741 | /** | |
742 | * fcoe_transport_disable() - Disables a FCoE interface | |
743 | * @buffer: The name of the Ethernet interface to be disabled | |
744 | * @kp: The associated kernel parameter | |
745 | * | |
746 | * Called from sysfs. | |
747 | * | |
748 | * Returns: 0 for success | |
749 | */ | |
750 | static int fcoe_transport_disable(const char *buffer, struct kernel_param *kp) | |
751 | { | |
752 | int rc = -ENODEV; | |
753 | struct net_device *netdev = NULL; | |
754 | struct fcoe_transport *ft = NULL; | |
755 | ||
b3960afe RL |
756 | mutex_lock(&ft_mutex); |
757 | ||
fdecf31b YZ |
758 | netdev = fcoe_if_to_netdev(buffer); |
759 | if (!netdev) | |
760 | goto out_nodev; | |
761 | ||
762 | ft = fcoe_netdev_map_lookup(netdev); | |
763 | if (!ft) | |
764 | goto out_putdev; | |
765 | ||
766 | rc = ft->disable ? ft->disable(netdev) : -ENODEV; | |
767 | ||
768 | out_putdev: | |
769 | dev_put(netdev); | |
770 | out_nodev: | |
771 | mutex_unlock(&ft_mutex); | |
772 | ||
773 | if (rc == -ERESTARTSYS) | |
774 | return restart_syscall(); | |
775 | else | |
776 | return rc; | |
777 | } | |
778 | ||
779 | /** | |
780 | * fcoe_transport_enable() - Enables a FCoE interface | |
781 | * @buffer: The name of the Ethernet interface to be enabled | |
782 | * @kp: The associated kernel parameter | |
783 | * | |
784 | * Called from sysfs. | |
785 | * | |
786 | * Returns: 0 for success | |
787 | */ | |
788 | static int fcoe_transport_enable(const char *buffer, struct kernel_param *kp) | |
789 | { | |
790 | int rc = -ENODEV; | |
791 | struct net_device *netdev = NULL; | |
792 | struct fcoe_transport *ft = NULL; | |
793 | ||
b3960afe RL |
794 | mutex_lock(&ft_mutex); |
795 | ||
fdecf31b YZ |
796 | netdev = fcoe_if_to_netdev(buffer); |
797 | if (!netdev) | |
798 | goto out_nodev; | |
799 | ||
800 | ft = fcoe_netdev_map_lookup(netdev); | |
801 | if (!ft) | |
802 | goto out_putdev; | |
803 | ||
804 | rc = ft->enable ? ft->enable(netdev) : -ENODEV; | |
805 | ||
806 | out_putdev: | |
807 | dev_put(netdev); | |
808 | out_nodev: | |
809 | mutex_unlock(&ft_mutex); | |
b3960afe | 810 | return rc; |
fdecf31b YZ |
811 | } |
812 | ||
813 | /** | |
814 | * libfcoe_init() - Initialization routine for libfcoe.ko | |
815 | */ | |
816 | static int __init libfcoe_init(void) | |
817 | { | |
9a74e884 | 818 | int rc = 0; |
fdecf31b | 819 | |
9a74e884 RL |
820 | rc = fcoe_transport_init(); |
821 | if (rc) | |
822 | return rc; | |
823 | ||
824 | rc = fcoe_sysfs_setup(); | |
825 | if (rc) | |
826 | fcoe_transport_exit(); | |
827 | ||
828 | return rc; | |
fdecf31b YZ |
829 | } |
830 | module_init(libfcoe_init); | |
831 | ||
832 | /** | |
833 | * libfcoe_exit() - Tear down libfcoe.ko | |
834 | */ | |
835 | static void __exit libfcoe_exit(void) | |
836 | { | |
9a74e884 | 837 | fcoe_sysfs_teardown(); |
fdecf31b YZ |
838 | fcoe_transport_exit(); |
839 | } | |
840 | module_exit(libfcoe_exit); |