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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 | ||
8597ae8b BPG |
86 | /** |
87 | * fcoe_fc_crc() - Calculates the CRC for a given frame | |
88 | * @fp: The frame to be checksumed | |
89 | * | |
90 | * This uses crc32() routine to calculate the CRC for a frame | |
91 | * | |
92 | * Return: The 32 bit CRC value | |
93 | */ | |
94 | u32 fcoe_fc_crc(struct fc_frame *fp) | |
95 | { | |
96 | struct sk_buff *skb = fp_skb(fp); | |
97 | struct skb_frag_struct *frag; | |
98 | unsigned char *data; | |
99 | unsigned long off, len, clen; | |
100 | u32 crc; | |
101 | unsigned i; | |
102 | ||
103 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
104 | ||
105 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
106 | frag = &skb_shinfo(skb)->frags[i]; | |
107 | off = frag->page_offset; | |
108 | len = frag->size; | |
109 | while (len > 0) { | |
110 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
111 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
112 | KM_SKB_DATA_SOFTIRQ); | |
113 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
114 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
115 | off += clen; | |
116 | len -= clen; | |
117 | } | |
118 | } | |
119 | return crc; | |
120 | } | |
121 | EXPORT_SYMBOL_GPL(fcoe_fc_crc); | |
122 | ||
123 | /** | |
124 | * fcoe_start_io() - Start FCoE I/O | |
125 | * @skb: The packet to be transmitted | |
126 | * | |
127 | * This routine is called from the net device to start transmitting | |
128 | * FCoE packets. | |
129 | * | |
130 | * Returns: 0 for success | |
131 | */ | |
132 | int fcoe_start_io(struct sk_buff *skb) | |
133 | { | |
134 | struct sk_buff *nskb; | |
135 | int rc; | |
136 | ||
137 | nskb = skb_clone(skb, GFP_ATOMIC); | |
138 | if (!nskb) | |
139 | return -ENOMEM; | |
140 | rc = dev_queue_xmit(nskb); | |
141 | if (rc != 0) | |
142 | return rc; | |
143 | kfree_skb(skb); | |
144 | return 0; | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(fcoe_start_io); | |
147 | ||
148 | ||
149 | /** | |
150 | * fcoe_clean_pending_queue() - Dequeue a skb and free it | |
151 | * @lport: The local port to dequeue a skb on | |
152 | */ | |
153 | void fcoe_clean_pending_queue(struct fc_lport *lport) | |
154 | { | |
155 | struct fcoe_port *port = lport_priv(lport); | |
156 | struct sk_buff *skb; | |
157 | ||
158 | spin_lock_bh(&port->fcoe_pending_queue.lock); | |
159 | while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) { | |
160 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
161 | kfree_skb(skb); | |
162 | spin_lock_bh(&port->fcoe_pending_queue.lock); | |
163 | } | |
164 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue); | |
167 | ||
168 | /** | |
169 | * fcoe_check_wait_queue() - Attempt to clear the transmit backlog | |
170 | * @lport: The local port whose backlog is to be cleared | |
171 | * | |
172 | * This empties the wait_queue, dequeues the head of the wait_queue queue | |
173 | * and calls fcoe_start_io() for each packet. If all skb have been | |
174 | * transmitted it returns the qlen. If an error occurs it restores | |
175 | * wait_queue (to try again later) and returns -1. | |
176 | * | |
177 | * The wait_queue is used when the skb transmit fails. The failed skb | |
178 | * will go in the wait_queue which will be emptied by the timer function or | |
179 | * by the next skb transmit. | |
180 | */ | |
181 | void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb) | |
182 | { | |
183 | struct fcoe_port *port = lport_priv(lport); | |
184 | int rc; | |
185 | ||
186 | spin_lock_bh(&port->fcoe_pending_queue.lock); | |
187 | ||
188 | if (skb) | |
189 | __skb_queue_tail(&port->fcoe_pending_queue, skb); | |
190 | ||
191 | if (port->fcoe_pending_queue_active) | |
192 | goto out; | |
193 | port->fcoe_pending_queue_active = 1; | |
194 | ||
195 | while (port->fcoe_pending_queue.qlen) { | |
196 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
197 | port->fcoe_pending_queue.qlen++; | |
198 | skb = __skb_dequeue(&port->fcoe_pending_queue); | |
199 | ||
200 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
201 | rc = fcoe_start_io(skb); | |
202 | spin_lock_bh(&port->fcoe_pending_queue.lock); | |
203 | ||
204 | if (rc) { | |
205 | __skb_queue_head(&port->fcoe_pending_queue, skb); | |
206 | /* undo temporary increment above */ | |
207 | port->fcoe_pending_queue.qlen--; | |
208 | break; | |
209 | } | |
210 | /* undo temporary increment above */ | |
211 | port->fcoe_pending_queue.qlen--; | |
212 | } | |
213 | ||
214 | if (port->fcoe_pending_queue.qlen < port->min_queue_depth) | |
215 | lport->qfull = 0; | |
216 | if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer)) | |
217 | mod_timer(&port->timer, jiffies + 2); | |
218 | port->fcoe_pending_queue_active = 0; | |
219 | out: | |
220 | if (port->fcoe_pending_queue.qlen > port->max_queue_depth) | |
221 | lport->qfull = 1; | |
222 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(fcoe_check_wait_queue); | |
225 | ||
226 | /** | |
227 | * fcoe_queue_timer() - The fcoe queue timer | |
228 | * @lport: The local port | |
229 | * | |
230 | * Calls fcoe_check_wait_queue on timeout | |
231 | */ | |
232 | void fcoe_queue_timer(ulong lport) | |
233 | { | |
234 | fcoe_check_wait_queue((struct fc_lport *)lport, NULL); | |
235 | } | |
236 | EXPORT_SYMBOL_GPL(fcoe_queue_timer); | |
237 | ||
238 | /** | |
239 | * fcoe_get_paged_crc_eof() - Allocate a page to be used for the trailer CRC | |
240 | * @skb: The packet to be transmitted | |
241 | * @tlen: The total length of the trailer | |
242 | * @fps: The fcoe context | |
243 | * | |
244 | * This routine allocates a page for frame trailers. The page is re-used if | |
245 | * there is enough room left on it for the current trailer. If there isn't | |
246 | * enough buffer left a new page is allocated for the trailer. Reference to | |
247 | * the page from this function as well as the skbs using the page fragments | |
248 | * ensure that the page is freed at the appropriate time. | |
249 | * | |
250 | * Returns: 0 for success | |
251 | */ | |
252 | int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen, | |
253 | struct fcoe_percpu_s *fps) | |
254 | { | |
255 | struct page *page; | |
256 | ||
257 | page = fps->crc_eof_page; | |
258 | if (!page) { | |
259 | page = alloc_page(GFP_ATOMIC); | |
260 | if (!page) | |
261 | return -ENOMEM; | |
262 | ||
263 | fps->crc_eof_page = page; | |
264 | fps->crc_eof_offset = 0; | |
265 | } | |
266 | ||
267 | get_page(page); | |
268 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
269 | fps->crc_eof_offset, tlen); | |
270 | skb->len += tlen; | |
271 | skb->data_len += tlen; | |
272 | skb->truesize += tlen; | |
273 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
274 | ||
275 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
276 | fps->crc_eof_page = NULL; | |
277 | fps->crc_eof_offset = 0; | |
278 | put_page(page); | |
279 | } | |
280 | ||
281 | return 0; | |
282 | } | |
283 | EXPORT_SYMBOL_GPL(fcoe_get_paged_crc_eof); | |
284 | ||
fdecf31b YZ |
285 | /** |
286 | * fcoe_transport_lookup - find an fcoe transport that matches a netdev | |
287 | * @netdev: The netdev to look for from all attached transports | |
288 | * | |
289 | * Returns : ptr to the fcoe transport that supports this netdev or NULL | |
290 | * if not found. | |
291 | * | |
292 | * The ft_mutex should be held when this is called | |
293 | */ | |
294 | static struct fcoe_transport *fcoe_transport_lookup(struct net_device *netdev) | |
295 | { | |
296 | struct fcoe_transport *ft = NULL; | |
297 | ||
298 | list_for_each_entry(ft, &fcoe_transports, list) | |
299 | if (ft->match && ft->match(netdev)) | |
300 | return ft; | |
301 | return NULL; | |
302 | } | |
303 | ||
304 | /** | |
305 | * fcoe_transport_attach - Attaches an FCoE transport | |
306 | * @ft: The fcoe transport to be attached | |
307 | * | |
308 | * Returns : 0 for success | |
309 | */ | |
310 | int fcoe_transport_attach(struct fcoe_transport *ft) | |
311 | { | |
312 | int rc = 0; | |
313 | ||
314 | mutex_lock(&ft_mutex); | |
315 | if (ft->attached) { | |
316 | LIBFCOE_TRANSPORT_DBG("transport %s already attached\n", | |
317 | ft->name); | |
318 | rc = -EEXIST; | |
319 | goto out_attach; | |
320 | } | |
321 | ||
322 | /* Add default transport to the tail */ | |
323 | if (strcmp(ft->name, FCOE_TRANSPORT_DEFAULT)) | |
324 | list_add(&ft->list, &fcoe_transports); | |
325 | else | |
326 | list_add_tail(&ft->list, &fcoe_transports); | |
327 | ||
328 | ft->attached = true; | |
329 | LIBFCOE_TRANSPORT_DBG("attaching transport %s\n", ft->name); | |
330 | ||
331 | out_attach: | |
332 | mutex_unlock(&ft_mutex); | |
333 | return rc; | |
334 | } | |
335 | EXPORT_SYMBOL(fcoe_transport_attach); | |
336 | ||
337 | /** | |
338 | * fcoe_transport_attach - Detaches an FCoE transport | |
339 | * @ft: The fcoe transport to be attached | |
340 | * | |
341 | * Returns : 0 for success | |
342 | */ | |
343 | int fcoe_transport_detach(struct fcoe_transport *ft) | |
344 | { | |
345 | int rc = 0; | |
69922fcd | 346 | struct fcoe_netdev_mapping *nm = NULL, *tmp; |
fdecf31b YZ |
347 | |
348 | mutex_lock(&ft_mutex); | |
349 | if (!ft->attached) { | |
350 | LIBFCOE_TRANSPORT_DBG("transport %s already detached\n", | |
351 | ft->name); | |
352 | rc = -ENODEV; | |
353 | goto out_attach; | |
354 | } | |
355 | ||
69922fcd YZ |
356 | /* remove netdev mapping for this transport as it is going away */ |
357 | mutex_lock(&fn_mutex); | |
358 | list_for_each_entry_safe(nm, tmp, &fcoe_netdevs, list) { | |
359 | if (nm->ft == ft) { | |
360 | LIBFCOE_TRANSPORT_DBG("transport %s going away, " | |
361 | "remove its netdev mapping for %s\n", | |
362 | ft->name, nm->netdev->name); | |
363 | list_del(&nm->list); | |
364 | kfree(nm); | |
365 | } | |
366 | } | |
367 | mutex_unlock(&fn_mutex); | |
368 | ||
fdecf31b YZ |
369 | list_del(&ft->list); |
370 | ft->attached = false; | |
371 | LIBFCOE_TRANSPORT_DBG("detaching transport %s\n", ft->name); | |
372 | ||
373 | out_attach: | |
374 | mutex_unlock(&ft_mutex); | |
375 | return rc; | |
376 | ||
377 | } | |
378 | EXPORT_SYMBOL(fcoe_transport_detach); | |
379 | ||
380 | static int fcoe_transport_show(char *buffer, const struct kernel_param *kp) | |
381 | { | |
382 | int i, j; | |
383 | struct fcoe_transport *ft = NULL; | |
384 | ||
385 | i = j = sprintf(buffer, "Attached FCoE transports:"); | |
386 | mutex_lock(&ft_mutex); | |
387 | list_for_each_entry(ft, &fcoe_transports, list) { | |
a01a5a57 | 388 | if (i >= PAGE_SIZE - IFNAMSIZ) |
fdecf31b | 389 | break; |
a01a5a57 | 390 | i += snprintf(&buffer[i], IFNAMSIZ, "%s ", ft->name); |
fdecf31b YZ |
391 | } |
392 | mutex_unlock(&ft_mutex); | |
393 | if (i == j) | |
394 | i += snprintf(&buffer[i], IFNAMSIZ, "none"); | |
395 | return i; | |
396 | } | |
397 | ||
398 | static int __init fcoe_transport_init(void) | |
399 | { | |
70be6344 | 400 | register_netdevice_notifier(&libfcoe_notifier); |
fdecf31b YZ |
401 | return 0; |
402 | } | |
403 | ||
404 | static int __exit fcoe_transport_exit(void) | |
405 | { | |
406 | struct fcoe_transport *ft; | |
407 | ||
70be6344 | 408 | unregister_netdevice_notifier(&libfcoe_notifier); |
fdecf31b YZ |
409 | mutex_lock(&ft_mutex); |
410 | list_for_each_entry(ft, &fcoe_transports, list) | |
411 | printk(KERN_ERR "FCoE transport %s is still attached!\n", | |
412 | ft->name); | |
413 | mutex_unlock(&ft_mutex); | |
414 | return 0; | |
415 | } | |
416 | ||
417 | ||
418 | static int fcoe_add_netdev_mapping(struct net_device *netdev, | |
419 | struct fcoe_transport *ft) | |
420 | { | |
421 | struct fcoe_netdev_mapping *nm; | |
422 | ||
423 | nm = kmalloc(sizeof(*nm), GFP_KERNEL); | |
424 | if (!nm) { | |
425 | printk(KERN_ERR "Unable to allocate netdev_mapping"); | |
426 | return -ENOMEM; | |
427 | } | |
428 | ||
429 | nm->netdev = netdev; | |
430 | nm->ft = ft; | |
431 | ||
70be6344 | 432 | mutex_lock(&fn_mutex); |
fdecf31b | 433 | list_add(&nm->list, &fcoe_netdevs); |
70be6344 | 434 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
435 | return 0; |
436 | } | |
437 | ||
438 | ||
439 | static void fcoe_del_netdev_mapping(struct net_device *netdev) | |
440 | { | |
441 | struct fcoe_netdev_mapping *nm = NULL, *tmp; | |
442 | ||
70be6344 | 443 | mutex_lock(&fn_mutex); |
fdecf31b YZ |
444 | list_for_each_entry_safe(nm, tmp, &fcoe_netdevs, list) { |
445 | if (nm->netdev == netdev) { | |
446 | list_del(&nm->list); | |
447 | kfree(nm); | |
70be6344 | 448 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
449 | return; |
450 | } | |
451 | } | |
70be6344 | 452 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
453 | } |
454 | ||
455 | ||
456 | /** | |
457 | * fcoe_netdev_map_lookup - find the fcoe transport that matches the netdev on which | |
458 | * it was created | |
459 | * | |
460 | * Returns : ptr to the fcoe transport that supports this netdev or NULL | |
461 | * if not found. | |
462 | * | |
463 | * The ft_mutex should be held when this is called | |
464 | */ | |
465 | static struct fcoe_transport *fcoe_netdev_map_lookup(struct net_device *netdev) | |
466 | { | |
467 | struct fcoe_transport *ft = NULL; | |
468 | struct fcoe_netdev_mapping *nm; | |
469 | ||
70be6344 | 470 | mutex_lock(&fn_mutex); |
fdecf31b YZ |
471 | list_for_each_entry(nm, &fcoe_netdevs, list) { |
472 | if (netdev == nm->netdev) { | |
473 | ft = nm->ft; | |
70be6344 | 474 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
475 | return ft; |
476 | } | |
477 | } | |
478 | ||
70be6344 | 479 | mutex_unlock(&fn_mutex); |
fdecf31b YZ |
480 | return NULL; |
481 | } | |
482 | ||
483 | /** | |
484 | * fcoe_if_to_netdev() - Parse a name buffer to get a net device | |
485 | * @buffer: The name of the net device | |
486 | * | |
487 | * Returns: NULL or a ptr to net_device | |
488 | */ | |
489 | static struct net_device *fcoe_if_to_netdev(const char *buffer) | |
490 | { | |
491 | char *cp; | |
492 | char ifname[IFNAMSIZ + 2]; | |
493 | ||
494 | if (buffer) { | |
495 | strlcpy(ifname, buffer, IFNAMSIZ); | |
496 | cp = ifname + strlen(ifname); | |
497 | while (--cp >= ifname && *cp == '\n') | |
498 | *cp = '\0'; | |
499 | return dev_get_by_name(&init_net, ifname); | |
500 | } | |
501 | return NULL; | |
502 | } | |
503 | ||
70be6344 BPG |
504 | /** |
505 | * libfcoe_device_notification() - Handler for net device events | |
506 | * @notifier: The context of the notification | |
507 | * @event: The type of event | |
508 | * @ptr: The net device that the event was on | |
509 | * | |
510 | * This function is called by the Ethernet driver in case of link change event. | |
511 | * | |
512 | * Returns: 0 for success | |
513 | */ | |
514 | static int libfcoe_device_notification(struct notifier_block *notifier, | |
515 | ulong event, void *ptr) | |
516 | { | |
517 | struct net_device *netdev = ptr; | |
518 | ||
519 | switch (event) { | |
520 | case NETDEV_UNREGISTER: | |
521 | printk(KERN_ERR "libfcoe_device_notification: NETDEV_UNREGISTER %s\n", | |
522 | netdev->name); | |
523 | fcoe_del_netdev_mapping(netdev); | |
524 | break; | |
525 | } | |
526 | return NOTIFY_OK; | |
527 | } | |
528 | ||
529 | ||
fdecf31b YZ |
530 | /** |
531 | * fcoe_transport_create() - Create a fcoe interface | |
532 | * @buffer: The name of the Ethernet interface to create on | |
533 | * @kp: The associated kernel param | |
534 | * | |
535 | * Called from sysfs. This holds the ft_mutex while calling the | |
536 | * registered fcoe transport's create function. | |
537 | * | |
538 | * Returns: 0 for success | |
539 | */ | |
540 | static int fcoe_transport_create(const char *buffer, struct kernel_param *kp) | |
541 | { | |
542 | int rc = -ENODEV; | |
543 | struct net_device *netdev = NULL; | |
544 | struct fcoe_transport *ft = NULL; | |
545 | enum fip_state fip_mode = (enum fip_state)(long)kp->arg; | |
546 | ||
fdecf31b YZ |
547 | #ifdef CONFIG_LIBFCOE_MODULE |
548 | /* | |
549 | * Make sure the module has been initialized, and is not about to be | |
550 | * removed. Module parameter sysfs files are writable before the | |
551 | * module_init function is called and after module_exit. | |
552 | */ | |
553 | if (THIS_MODULE->state != MODULE_STATE_LIVE) | |
554 | goto out_nodev; | |
555 | #endif | |
556 | ||
b3960afe RL |
557 | mutex_lock(&ft_mutex); |
558 | ||
fdecf31b YZ |
559 | netdev = fcoe_if_to_netdev(buffer); |
560 | if (!netdev) { | |
561 | LIBFCOE_TRANSPORT_DBG("Invalid device %s.\n", buffer); | |
562 | goto out_nodev; | |
563 | } | |
564 | ||
565 | ft = fcoe_netdev_map_lookup(netdev); | |
566 | if (ft) { | |
567 | LIBFCOE_TRANSPORT_DBG("transport %s already has existing " | |
568 | "FCoE instance on %s.\n", | |
569 | ft->name, netdev->name); | |
570 | rc = -EEXIST; | |
571 | goto out_putdev; | |
572 | } | |
573 | ||
574 | ft = fcoe_transport_lookup(netdev); | |
575 | if (!ft) { | |
576 | LIBFCOE_TRANSPORT_DBG("no FCoE transport found for %s.\n", | |
577 | netdev->name); | |
578 | goto out_putdev; | |
579 | } | |
580 | ||
581 | rc = fcoe_add_netdev_mapping(netdev, ft); | |
582 | if (rc) { | |
583 | LIBFCOE_TRANSPORT_DBG("failed to add new netdev mapping " | |
584 | "for FCoE transport %s for %s.\n", | |
585 | ft->name, netdev->name); | |
586 | goto out_putdev; | |
587 | } | |
588 | ||
589 | /* pass to transport create */ | |
590 | rc = ft->create ? ft->create(netdev, fip_mode) : -ENODEV; | |
591 | if (rc) | |
592 | fcoe_del_netdev_mapping(netdev); | |
593 | ||
594 | LIBFCOE_TRANSPORT_DBG("transport %s %s to create fcoe on %s.\n", | |
595 | ft->name, (rc) ? "failed" : "succeeded", | |
596 | netdev->name); | |
597 | ||
598 | out_putdev: | |
599 | dev_put(netdev); | |
600 | out_nodev: | |
601 | mutex_unlock(&ft_mutex); | |
b3960afe | 602 | return rc; |
fdecf31b YZ |
603 | } |
604 | ||
605 | /** | |
606 | * fcoe_transport_destroy() - Destroy a FCoE interface | |
607 | * @buffer: The name of the Ethernet interface to be destroyed | |
608 | * @kp: The associated kernel parameter | |
609 | * | |
610 | * Called from sysfs. This holds the ft_mutex while calling the | |
611 | * registered fcoe transport's destroy function. | |
612 | * | |
613 | * Returns: 0 for success | |
614 | */ | |
615 | static int fcoe_transport_destroy(const char *buffer, struct kernel_param *kp) | |
616 | { | |
617 | int rc = -ENODEV; | |
618 | struct net_device *netdev = NULL; | |
619 | struct fcoe_transport *ft = NULL; | |
620 | ||
fdecf31b YZ |
621 | #ifdef CONFIG_LIBFCOE_MODULE |
622 | /* | |
623 | * Make sure the module has been initialized, and is not about to be | |
624 | * removed. Module parameter sysfs files are writable before the | |
625 | * module_init function is called and after module_exit. | |
626 | */ | |
627 | if (THIS_MODULE->state != MODULE_STATE_LIVE) | |
628 | goto out_nodev; | |
629 | #endif | |
630 | ||
b3960afe RL |
631 | mutex_lock(&ft_mutex); |
632 | ||
fdecf31b YZ |
633 | netdev = fcoe_if_to_netdev(buffer); |
634 | if (!netdev) { | |
635 | LIBFCOE_TRANSPORT_DBG("invalid device %s.\n", buffer); | |
636 | goto out_nodev; | |
637 | } | |
638 | ||
639 | ft = fcoe_netdev_map_lookup(netdev); | |
640 | if (!ft) { | |
641 | LIBFCOE_TRANSPORT_DBG("no FCoE transport found for %s.\n", | |
642 | netdev->name); | |
643 | goto out_putdev; | |
644 | } | |
645 | ||
646 | /* pass to transport destroy */ | |
647 | rc = ft->destroy ? ft->destroy(netdev) : -ENODEV; | |
648 | fcoe_del_netdev_mapping(netdev); | |
649 | LIBFCOE_TRANSPORT_DBG("transport %s %s to destroy fcoe on %s.\n", | |
650 | ft->name, (rc) ? "failed" : "succeeded", | |
651 | netdev->name); | |
652 | ||
653 | out_putdev: | |
654 | dev_put(netdev); | |
655 | out_nodev: | |
656 | mutex_unlock(&ft_mutex); | |
b3960afe | 657 | return rc; |
fdecf31b YZ |
658 | } |
659 | ||
660 | /** | |
661 | * fcoe_transport_disable() - Disables a FCoE interface | |
662 | * @buffer: The name of the Ethernet interface to be disabled | |
663 | * @kp: The associated kernel parameter | |
664 | * | |
665 | * Called from sysfs. | |
666 | * | |
667 | * Returns: 0 for success | |
668 | */ | |
669 | static int fcoe_transport_disable(const char *buffer, struct kernel_param *kp) | |
670 | { | |
671 | int rc = -ENODEV; | |
672 | struct net_device *netdev = NULL; | |
673 | struct fcoe_transport *ft = NULL; | |
674 | ||
fdecf31b YZ |
675 | #ifdef CONFIG_LIBFCOE_MODULE |
676 | /* | |
677 | * Make sure the module has been initialized, and is not about to be | |
678 | * removed. Module parameter sysfs files are writable before the | |
679 | * module_init function is called and after module_exit. | |
680 | */ | |
681 | if (THIS_MODULE->state != MODULE_STATE_LIVE) | |
682 | goto out_nodev; | |
683 | #endif | |
684 | ||
b3960afe RL |
685 | mutex_lock(&ft_mutex); |
686 | ||
fdecf31b YZ |
687 | netdev = fcoe_if_to_netdev(buffer); |
688 | if (!netdev) | |
689 | goto out_nodev; | |
690 | ||
691 | ft = fcoe_netdev_map_lookup(netdev); | |
692 | if (!ft) | |
693 | goto out_putdev; | |
694 | ||
695 | rc = ft->disable ? ft->disable(netdev) : -ENODEV; | |
696 | ||
697 | out_putdev: | |
698 | dev_put(netdev); | |
699 | out_nodev: | |
700 | mutex_unlock(&ft_mutex); | |
701 | ||
702 | if (rc == -ERESTARTSYS) | |
703 | return restart_syscall(); | |
704 | else | |
705 | return rc; | |
706 | } | |
707 | ||
708 | /** | |
709 | * fcoe_transport_enable() - Enables a FCoE interface | |
710 | * @buffer: The name of the Ethernet interface to be enabled | |
711 | * @kp: The associated kernel parameter | |
712 | * | |
713 | * Called from sysfs. | |
714 | * | |
715 | * Returns: 0 for success | |
716 | */ | |
717 | static int fcoe_transport_enable(const char *buffer, struct kernel_param *kp) | |
718 | { | |
719 | int rc = -ENODEV; | |
720 | struct net_device *netdev = NULL; | |
721 | struct fcoe_transport *ft = NULL; | |
722 | ||
fdecf31b YZ |
723 | #ifdef CONFIG_LIBFCOE_MODULE |
724 | /* | |
725 | * Make sure the module has been initialized, and is not about to be | |
726 | * removed. Module parameter sysfs files are writable before the | |
727 | * module_init function is called and after module_exit. | |
728 | */ | |
729 | if (THIS_MODULE->state != MODULE_STATE_LIVE) | |
730 | goto out_nodev; | |
731 | #endif | |
732 | ||
b3960afe RL |
733 | mutex_lock(&ft_mutex); |
734 | ||
fdecf31b YZ |
735 | netdev = fcoe_if_to_netdev(buffer); |
736 | if (!netdev) | |
737 | goto out_nodev; | |
738 | ||
739 | ft = fcoe_netdev_map_lookup(netdev); | |
740 | if (!ft) | |
741 | goto out_putdev; | |
742 | ||
743 | rc = ft->enable ? ft->enable(netdev) : -ENODEV; | |
744 | ||
745 | out_putdev: | |
746 | dev_put(netdev); | |
747 | out_nodev: | |
748 | mutex_unlock(&ft_mutex); | |
b3960afe | 749 | return rc; |
fdecf31b YZ |
750 | } |
751 | ||
752 | /** | |
753 | * libfcoe_init() - Initialization routine for libfcoe.ko | |
754 | */ | |
755 | static int __init libfcoe_init(void) | |
756 | { | |
757 | fcoe_transport_init(); | |
758 | ||
759 | return 0; | |
760 | } | |
761 | module_init(libfcoe_init); | |
762 | ||
763 | /** | |
764 | * libfcoe_exit() - Tear down libfcoe.ko | |
765 | */ | |
766 | static void __exit libfcoe_exit(void) | |
767 | { | |
768 | fcoe_transport_exit(); | |
769 | } | |
770 | module_exit(libfcoe_exit); |