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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> | |
85b4aa49 | 22 | #include <linux/spinlock.h> |
85b4aa49 RL |
23 | #include <linux/netdevice.h> |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/ethtool.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/if_vlan.h> | |
85b4aa49 RL |
28 | #include <linux/crc32.h> |
29 | #include <linux/cpu.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/sysfs.h> | |
32 | #include <linux/ctype.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsicam.h> | |
35 | #include <scsi/scsi_transport.h> | |
36 | #include <scsi/scsi_transport_fc.h> | |
37 | #include <net/rtnetlink.h> | |
38 | ||
39 | #include <scsi/fc/fc_encaps.h> | |
40 | ||
41 | #include <scsi/libfc.h> | |
42 | #include <scsi/fc_frame.h> | |
43 | #include <scsi/libfcoe.h> | |
85b4aa49 | 44 | |
fdd78027 | 45 | #include "fcoe.h" |
7f349142 | 46 | |
fdd78027 | 47 | static int debug_fcoe; |
7f349142 | 48 | |
85b4aa49 RL |
49 | MODULE_AUTHOR("Open-FCoE.org"); |
50 | MODULE_DESCRIPTION("FCoE"); | |
9b34ecff | 51 | MODULE_LICENSE("GPL v2"); |
85b4aa49 RL |
52 | |
53 | /* fcoe host list */ | |
54 | LIST_HEAD(fcoe_hostlist); | |
55 | DEFINE_RWLOCK(fcoe_hostlist_lock); | |
56 | DEFINE_TIMER(fcoe_timer, NULL, 0, 0); | |
5e5e92df | 57 | DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
85b4aa49 | 58 | |
85b4aa49 | 59 | /* Function Prototyes */ |
fdd78027 VD |
60 | static int fcoe_reset(struct Scsi_Host *shost); |
61 | static int fcoe_xmit(struct fc_lport *, struct fc_frame *); | |
62 | static int fcoe_rcv(struct sk_buff *, struct net_device *, | |
63 | struct packet_type *, struct net_device *); | |
64 | static int fcoe_percpu_receive_thread(void *arg); | |
65 | static void fcoe_clean_pending_queue(struct fc_lport *lp); | |
66 | static void fcoe_percpu_clean(struct fc_lport *lp); | |
67 | static int fcoe_link_ok(struct fc_lport *lp); | |
68 | ||
69 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); | |
70 | static int fcoe_hostlist_add(const struct fc_lport *); | |
71 | static int fcoe_hostlist_remove(const struct fc_lport *); | |
72 | ||
85b4aa49 | 73 | static int fcoe_check_wait_queue(struct fc_lport *); |
85b4aa49 | 74 | static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *); |
85b4aa49 RL |
75 | static int fcoe_device_notification(struct notifier_block *, ulong, void *); |
76 | static void fcoe_dev_setup(void); | |
77 | static void fcoe_dev_cleanup(void); | |
78 | ||
79 | /* notification function from net device */ | |
80 | static struct notifier_block fcoe_notifier = { | |
81 | .notifier_call = fcoe_device_notification, | |
82 | }; | |
83 | ||
7f349142 VD |
84 | static struct scsi_transport_template *scsi_transport_fcoe_sw; |
85 | ||
86 | struct fc_function_template fcoe_transport_function = { | |
87 | .show_host_node_name = 1, | |
88 | .show_host_port_name = 1, | |
89 | .show_host_supported_classes = 1, | |
90 | .show_host_supported_fc4s = 1, | |
91 | .show_host_active_fc4s = 1, | |
92 | .show_host_maxframe_size = 1, | |
93 | ||
94 | .show_host_port_id = 1, | |
95 | .show_host_supported_speeds = 1, | |
96 | .get_host_speed = fc_get_host_speed, | |
97 | .show_host_speed = 1, | |
98 | .show_host_port_type = 1, | |
99 | .get_host_port_state = fc_get_host_port_state, | |
100 | .show_host_port_state = 1, | |
101 | .show_host_symbolic_name = 1, | |
102 | ||
103 | .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), | |
104 | .show_rport_maxframe_size = 1, | |
105 | .show_rport_supported_classes = 1, | |
106 | ||
107 | .show_host_fabric_name = 1, | |
108 | .show_starget_node_name = 1, | |
109 | .show_starget_port_name = 1, | |
110 | .show_starget_port_id = 1, | |
111 | .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, | |
112 | .show_rport_dev_loss_tmo = 1, | |
113 | .get_fc_host_stats = fc_get_host_stats, | |
114 | .issue_fc_host_lip = fcoe_reset, | |
115 | ||
116 | .terminate_rport_io = fc_rport_terminate_io, | |
117 | }; | |
118 | ||
119 | static struct scsi_host_template fcoe_shost_template = { | |
120 | .module = THIS_MODULE, | |
121 | .name = "FCoE Driver", | |
122 | .proc_name = FCOE_NAME, | |
123 | .queuecommand = fc_queuecommand, | |
124 | .eh_abort_handler = fc_eh_abort, | |
125 | .eh_device_reset_handler = fc_eh_device_reset, | |
126 | .eh_host_reset_handler = fc_eh_host_reset, | |
127 | .slave_alloc = fc_slave_alloc, | |
128 | .change_queue_depth = fc_change_queue_depth, | |
129 | .change_queue_type = fc_change_queue_type, | |
130 | .this_id = -1, | |
131 | .cmd_per_lun = 32, | |
132 | .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, | |
133 | .use_clustering = ENABLE_CLUSTERING, | |
134 | .sg_tablesize = SG_ALL, | |
135 | .max_sectors = 0xffff, | |
136 | }; | |
137 | ||
138 | /** | |
139 | * fcoe_lport_config() - sets up the fc_lport | |
140 | * @lp: ptr to the fc_lport | |
141 | * @shost: ptr to the parent scsi host | |
142 | * | |
143 | * Returns: 0 for success | |
144 | */ | |
145 | static int fcoe_lport_config(struct fc_lport *lp) | |
146 | { | |
147 | lp->link_up = 0; | |
148 | lp->qfull = 0; | |
149 | lp->max_retry_count = 3; | |
150 | lp->e_d_tov = 2 * 1000; /* FC-FS default */ | |
151 | lp->r_a_tov = 2 * 2 * 1000; | |
152 | lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | | |
153 | FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); | |
154 | ||
155 | fc_lport_init_stats(lp); | |
156 | ||
157 | /* lport fc_lport related configuration */ | |
158 | fc_lport_config(lp); | |
159 | ||
160 | /* offload related configuration */ | |
161 | lp->crc_offload = 0; | |
162 | lp->seq_offload = 0; | |
163 | lp->lro_enabled = 0; | |
164 | lp->lro_xid = 0; | |
165 | lp->lso_max = 0; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | /** | |
171 | * fcoe_netdev_config() - Set up netdev for SW FCoE | |
172 | * @lp : ptr to the fc_lport | |
173 | * @netdev : ptr to the associated netdevice struct | |
174 | * | |
175 | * Must be called after fcoe_lport_config() as it will use lport mutex | |
176 | * | |
177 | * Returns : 0 for success | |
178 | */ | |
179 | static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) | |
180 | { | |
181 | u32 mfs; | |
182 | u64 wwnn, wwpn; | |
183 | struct fcoe_softc *fc; | |
184 | u8 flogi_maddr[ETH_ALEN]; | |
185 | ||
186 | /* Setup lport private data to point to fcoe softc */ | |
187 | fc = lport_priv(lp); | |
188 | fc->lp = lp; | |
189 | fc->real_dev = netdev; | |
190 | fc->phys_dev = netdev; | |
191 | ||
192 | /* Require support for get_pauseparam ethtool op. */ | |
193 | if (netdev->priv_flags & IFF_802_1Q_VLAN) | |
194 | fc->phys_dev = vlan_dev_real_dev(netdev); | |
195 | ||
196 | /* Do not support for bonding device */ | |
197 | if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) || | |
198 | (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) || | |
199 | (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) { | |
200 | return -EOPNOTSUPP; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Determine max frame size based on underlying device and optional | |
205 | * user-configured limit. If the MFS is too low, fcoe_link_ok() | |
206 | * will return 0, so do this first. | |
207 | */ | |
208 | mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) + | |
209 | sizeof(struct fcoe_crc_eof)); | |
210 | if (fc_set_mfs(lp, mfs)) | |
211 | return -EINVAL; | |
212 | ||
213 | if (!fcoe_link_ok(lp)) | |
214 | lp->link_up = 1; | |
215 | ||
216 | /* offload features support */ | |
217 | if (fc->real_dev->features & NETIF_F_SG) | |
218 | lp->sg_supp = 1; | |
219 | ||
220 | #ifdef NETIF_F_FCOE_CRC | |
221 | if (netdev->features & NETIF_F_FCOE_CRC) { | |
222 | lp->crc_offload = 1; | |
223 | printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n", | |
224 | netdev->name); | |
225 | } | |
226 | #endif | |
227 | #ifdef NETIF_F_FSO | |
228 | if (netdev->features & NETIF_F_FSO) { | |
229 | lp->seq_offload = 1; | |
230 | lp->lso_max = netdev->gso_max_size; | |
231 | printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n", | |
232 | netdev->name, lp->lso_max); | |
233 | } | |
234 | #endif | |
235 | if (netdev->fcoe_ddp_xid) { | |
236 | lp->lro_enabled = 1; | |
237 | lp->lro_xid = netdev->fcoe_ddp_xid; | |
238 | printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n", | |
239 | netdev->name, lp->lro_xid); | |
240 | } | |
241 | skb_queue_head_init(&fc->fcoe_pending_queue); | |
242 | fc->fcoe_pending_queue_active = 0; | |
243 | ||
244 | /* setup Source Mac Address */ | |
245 | memcpy(fc->ctl_src_addr, fc->real_dev->dev_addr, | |
246 | fc->real_dev->addr_len); | |
247 | ||
248 | wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0); | |
249 | fc_set_wwnn(lp, wwnn); | |
250 | /* XXX - 3rd arg needs to be vlan id */ | |
251 | wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0); | |
252 | fc_set_wwpn(lp, wwpn); | |
253 | ||
254 | /* | |
255 | * Add FCoE MAC address as second unicast MAC address | |
256 | * or enter promiscuous mode if not capable of listening | |
257 | * for multiple unicast MACs. | |
258 | */ | |
259 | rtnl_lock(); | |
260 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
261 | dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN); | |
262 | rtnl_unlock(); | |
263 | ||
264 | /* | |
265 | * setup the receive function from ethernet driver | |
266 | * on the ethertype for the given device | |
267 | */ | |
268 | fc->fcoe_packet_type.func = fcoe_rcv; | |
269 | fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); | |
270 | fc->fcoe_packet_type.dev = fc->real_dev; | |
271 | dev_add_pack(&fc->fcoe_packet_type); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | /** | |
277 | * fcoe_shost_config() - Sets up fc_lport->host | |
278 | * @lp : ptr to the fc_lport | |
279 | * @shost : ptr to the associated scsi host | |
280 | * @dev : device associated to scsi host | |
281 | * | |
282 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() | |
283 | * | |
284 | * Returns : 0 for success | |
285 | */ | |
286 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, | |
287 | struct device *dev) | |
288 | { | |
289 | int rc = 0; | |
290 | ||
291 | /* lport scsi host config */ | |
292 | lp->host = shost; | |
293 | ||
294 | lp->host->max_lun = FCOE_MAX_LUN; | |
295 | lp->host->max_id = FCOE_MAX_FCP_TARGET; | |
296 | lp->host->max_channel = 0; | |
297 | lp->host->transportt = scsi_transport_fcoe_sw; | |
298 | ||
299 | /* add the new host to the SCSI-ml */ | |
300 | rc = scsi_add_host(lp->host, dev); | |
301 | if (rc) { | |
302 | FC_DBG("fcoe_shost_config:error on scsi_add_host\n"); | |
303 | return rc; | |
304 | } | |
305 | sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", | |
306 | FCOE_NAME, FCOE_VERSION, | |
307 | fcoe_netdev(lp)->name); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | /** | |
313 | * fcoe_em_config() - allocates em for this lport | |
314 | * @lp: the port that em is to allocated for | |
315 | * | |
316 | * Returns : 0 on success | |
317 | */ | |
318 | static inline int fcoe_em_config(struct fc_lport *lp) | |
319 | { | |
320 | BUG_ON(lp->emp); | |
321 | ||
322 | lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3, | |
323 | FCOE_MIN_XID, FCOE_MAX_XID); | |
324 | if (!lp->emp) | |
325 | return -ENOMEM; | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | /** | |
331 | * fcoe_if_destroy() - FCoE software HBA tear-down function | |
332 | * @netdev: ptr to the associated net_device | |
333 | * | |
334 | * Returns: 0 if link is OK for use by FCoE. | |
335 | */ | |
336 | static int fcoe_if_destroy(struct net_device *netdev) | |
337 | { | |
338 | struct fc_lport *lp = NULL; | |
339 | struct fcoe_softc *fc; | |
340 | u8 flogi_maddr[ETH_ALEN]; | |
341 | ||
342 | BUG_ON(!netdev); | |
343 | ||
344 | printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n", | |
345 | netdev->name); | |
346 | ||
347 | lp = fcoe_hostlist_lookup(netdev); | |
348 | if (!lp) | |
349 | return -ENODEV; | |
350 | ||
351 | fc = lport_priv(lp); | |
352 | ||
353 | /* Logout of the fabric */ | |
354 | fc_fabric_logoff(lp); | |
355 | ||
356 | /* Remove the instance from fcoe's list */ | |
357 | fcoe_hostlist_remove(lp); | |
358 | ||
359 | /* Don't listen for Ethernet packets anymore */ | |
360 | dev_remove_pack(&fc->fcoe_packet_type); | |
361 | ||
362 | /* Cleanup the fc_lport */ | |
363 | fc_lport_destroy(lp); | |
364 | fc_fcp_destroy(lp); | |
365 | ||
366 | /* Detach from the scsi-ml */ | |
367 | fc_remove_host(lp->host); | |
368 | scsi_remove_host(lp->host); | |
369 | ||
370 | /* There are no more rports or I/O, free the EM */ | |
371 | if (lp->emp) | |
372 | fc_exch_mgr_free(lp->emp); | |
373 | ||
374 | /* Delete secondary MAC addresses */ | |
375 | rtnl_lock(); | |
376 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
377 | dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN); | |
378 | if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 })) | |
379 | dev_unicast_delete(fc->real_dev, fc->data_src_addr, ETH_ALEN); | |
380 | rtnl_unlock(); | |
381 | ||
382 | /* Free the per-CPU revieve threads */ | |
383 | fcoe_percpu_clean(lp); | |
384 | ||
385 | /* Free existing skbs */ | |
386 | fcoe_clean_pending_queue(lp); | |
387 | ||
388 | /* Free memory used by statistical counters */ | |
389 | fc_lport_free_stats(lp); | |
390 | ||
391 | /* Release the net_device and Scsi_Host */ | |
392 | dev_put(fc->real_dev); | |
393 | scsi_host_put(lp->host); | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | /* | |
399 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device | |
400 | * @lp: the corresponding fc_lport | |
401 | * @xid: the exchange id for this ddp transfer | |
402 | * @sgl: the scatterlist describing this transfer | |
403 | * @sgc: number of sg items | |
404 | * | |
405 | * Returns : 0 no ddp | |
406 | */ | |
407 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, | |
408 | struct scatterlist *sgl, unsigned int sgc) | |
409 | { | |
410 | struct net_device *n = fcoe_netdev(lp); | |
411 | ||
412 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup) | |
413 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | /* | |
419 | * fcoe_ddp_done - calls LLD's ddp_done through net_device | |
420 | * @lp: the corresponding fc_lport | |
421 | * @xid: the exchange id for this ddp transfer | |
422 | * | |
423 | * Returns : the length of data that have been completed by ddp | |
424 | */ | |
425 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) | |
426 | { | |
427 | struct net_device *n = fcoe_netdev(lp); | |
428 | ||
429 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done) | |
430 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); | |
431 | return 0; | |
432 | } | |
433 | ||
434 | static struct libfc_function_template fcoe_libfc_fcn_templ = { | |
435 | .frame_send = fcoe_xmit, | |
436 | .ddp_setup = fcoe_ddp_setup, | |
437 | .ddp_done = fcoe_ddp_done, | |
438 | }; | |
439 | ||
440 | /** | |
441 | * fcoe_if_create() - this function creates the fcoe interface | |
442 | * @netdev: pointer the associated netdevice | |
443 | * | |
444 | * Creates fc_lport struct and scsi_host for lport, configures lport | |
445 | * and starts fabric login. | |
446 | * | |
447 | * Returns : 0 on success | |
448 | */ | |
449 | static int fcoe_if_create(struct net_device *netdev) | |
450 | { | |
451 | int rc; | |
452 | struct fc_lport *lp = NULL; | |
453 | struct fcoe_softc *fc; | |
454 | struct Scsi_Host *shost; | |
455 | ||
456 | BUG_ON(!netdev); | |
457 | ||
458 | printk(KERN_DEBUG "fcoe_if_create:interface on %s\n", | |
459 | netdev->name); | |
460 | ||
461 | lp = fcoe_hostlist_lookup(netdev); | |
462 | if (lp) | |
463 | return -EEXIST; | |
464 | ||
a0a25da2 VD |
465 | shost = libfc_host_alloc(&fcoe_shost_template, |
466 | sizeof(struct fcoe_softc)); | |
7f349142 VD |
467 | if (!shost) { |
468 | FC_DBG("Could not allocate host structure\n"); | |
469 | return -ENOMEM; | |
470 | } | |
471 | lp = shost_priv(shost); | |
472 | fc = lport_priv(lp); | |
473 | ||
474 | /* configure fc_lport, e.g., em */ | |
475 | rc = fcoe_lport_config(lp); | |
476 | if (rc) { | |
477 | FC_DBG("Could not configure lport\n"); | |
478 | goto out_host_put; | |
479 | } | |
480 | ||
481 | /* configure lport network properties */ | |
482 | rc = fcoe_netdev_config(lp, netdev); | |
483 | if (rc) { | |
484 | FC_DBG("Could not configure netdev for lport\n"); | |
485 | goto out_host_put; | |
486 | } | |
487 | ||
488 | /* configure lport scsi host properties */ | |
489 | rc = fcoe_shost_config(lp, shost, &netdev->dev); | |
490 | if (rc) { | |
491 | FC_DBG("Could not configure shost for lport\n"); | |
492 | goto out_host_put; | |
493 | } | |
494 | ||
495 | /* lport exch manager allocation */ | |
496 | rc = fcoe_em_config(lp); | |
497 | if (rc) { | |
498 | FC_DBG("Could not configure em for lport\n"); | |
499 | goto out_host_put; | |
500 | } | |
501 | ||
502 | /* Initialize the library */ | |
503 | rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ); | |
504 | if (rc) { | |
505 | FC_DBG("Could not configure libfc for lport!\n"); | |
506 | goto out_lp_destroy; | |
507 | } | |
508 | ||
509 | /* add to lports list */ | |
510 | fcoe_hostlist_add(lp); | |
511 | ||
512 | lp->boot_time = jiffies; | |
513 | ||
514 | fc_fabric_login(lp); | |
515 | ||
516 | dev_hold(netdev); | |
517 | ||
518 | return rc; | |
519 | ||
520 | out_lp_destroy: | |
521 | fc_exch_mgr_free(lp->emp); /* Free the EM */ | |
522 | out_host_put: | |
523 | scsi_host_put(lp->host); | |
524 | return rc; | |
525 | } | |
526 | ||
527 | /** | |
528 | * fcoe_if_init() - attach to scsi transport | |
529 | * | |
530 | * Returns : 0 on success | |
531 | */ | |
532 | static int __init fcoe_if_init(void) | |
533 | { | |
534 | /* attach to scsi transport */ | |
535 | scsi_transport_fcoe_sw = | |
536 | fc_attach_transport(&fcoe_transport_function); | |
537 | ||
538 | if (!scsi_transport_fcoe_sw) { | |
539 | printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n"); | |
540 | return -ENODEV; | |
541 | } | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
546 | /** | |
547 | * fcoe_if_exit() - detach from scsi transport | |
548 | * | |
549 | * Returns : 0 on success | |
550 | */ | |
551 | int __exit fcoe_if_exit(void) | |
552 | { | |
553 | fc_release_transport(scsi_transport_fcoe_sw); | |
554 | return 0; | |
555 | } | |
556 | ||
8976f424 RL |
557 | /** |
558 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu | |
559 | * @cpu: cpu index for the online cpu | |
560 | */ | |
561 | static void fcoe_percpu_thread_create(unsigned int cpu) | |
562 | { | |
563 | struct fcoe_percpu_s *p; | |
564 | struct task_struct *thread; | |
565 | ||
566 | p = &per_cpu(fcoe_percpu, cpu); | |
567 | ||
568 | thread = kthread_create(fcoe_percpu_receive_thread, | |
569 | (void *)p, "fcoethread/%d", cpu); | |
570 | ||
571 | if (likely(!IS_ERR(p->thread))) { | |
572 | kthread_bind(thread, cpu); | |
573 | wake_up_process(thread); | |
574 | ||
575 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
576 | p->thread = thread; | |
577 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
578 | } | |
579 | } | |
580 | ||
581 | /** | |
582 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu | |
583 | * @cpu: cpu index the rx thread is to be removed | |
584 | * | |
585 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the | |
586 | * current CPU's Rx thread. If the thread being destroyed is bound to | |
587 | * the CPU processing this context the skbs will be freed. | |
588 | */ | |
589 | static void fcoe_percpu_thread_destroy(unsigned int cpu) | |
590 | { | |
591 | struct fcoe_percpu_s *p; | |
592 | struct task_struct *thread; | |
593 | struct page *crc_eof; | |
594 | struct sk_buff *skb; | |
595 | #ifdef CONFIG_SMP | |
596 | struct fcoe_percpu_s *p0; | |
597 | unsigned targ_cpu = smp_processor_id(); | |
598 | #endif /* CONFIG_SMP */ | |
599 | ||
600 | printk(KERN_DEBUG "fcoe: Destroying receive thread for CPU %d\n", cpu); | |
601 | ||
602 | /* Prevent any new skbs from being queued for this CPU. */ | |
603 | p = &per_cpu(fcoe_percpu, cpu); | |
604 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
605 | thread = p->thread; | |
606 | p->thread = NULL; | |
607 | crc_eof = p->crc_eof_page; | |
608 | p->crc_eof_page = NULL; | |
609 | p->crc_eof_offset = 0; | |
610 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
611 | ||
612 | #ifdef CONFIG_SMP | |
613 | /* | |
614 | * Don't bother moving the skb's if this context is running | |
615 | * on the same CPU that is having its thread destroyed. This | |
616 | * can easily happen when the module is removed. | |
617 | */ | |
618 | if (cpu != targ_cpu) { | |
619 | p0 = &per_cpu(fcoe_percpu, targ_cpu); | |
620 | spin_lock_bh(&p0->fcoe_rx_list.lock); | |
621 | if (p0->thread) { | |
622 | FC_DBG("Moving frames from CPU %d to CPU %d\n", | |
623 | cpu, targ_cpu); | |
624 | ||
625 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
626 | __skb_queue_tail(&p0->fcoe_rx_list, skb); | |
627 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
628 | } else { | |
629 | /* | |
630 | * The targeted CPU is not initialized and cannot accept | |
631 | * new skbs. Unlock the targeted CPU and drop the skbs | |
632 | * on the CPU that is going offline. | |
633 | */ | |
634 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
635 | kfree_skb(skb); | |
636 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
637 | } | |
638 | } else { | |
639 | /* | |
640 | * This scenario occurs when the module is being removed | |
641 | * and all threads are being destroyed. skbs will continue | |
642 | * to be shifted from the CPU thread that is being removed | |
643 | * to the CPU thread associated with the CPU that is processing | |
644 | * the module removal. Once there is only one CPU Rx thread it | |
645 | * will reach this case and we will drop all skbs and later | |
646 | * stop the thread. | |
647 | */ | |
648 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
649 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
650 | kfree_skb(skb); | |
651 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
652 | } | |
653 | #else | |
654 | /* | |
655 | * This a non-SMP scenario where the singluar Rx thread is | |
656 | * being removed. Free all skbs and stop the thread. | |
657 | */ | |
658 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
659 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
660 | kfree_skb(skb); | |
661 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
662 | #endif | |
663 | ||
664 | if (thread) | |
665 | kthread_stop(thread); | |
666 | ||
667 | if (crc_eof) | |
668 | put_page(crc_eof); | |
669 | } | |
670 | ||
671 | /** | |
672 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback | |
673 | * @nfb: callback data block | |
674 | * @action: event triggering the callback | |
675 | * @hcpu: index for the cpu of this event | |
676 | * | |
677 | * This creates or destroys per cpu data for fcoe | |
678 | * | |
679 | * Returns NOTIFY_OK always. | |
680 | */ | |
681 | static int fcoe_cpu_callback(struct notifier_block *nfb, | |
682 | unsigned long action, void *hcpu) | |
683 | { | |
684 | unsigned cpu = (unsigned long)hcpu; | |
685 | ||
686 | switch (action) { | |
687 | case CPU_ONLINE: | |
688 | case CPU_ONLINE_FROZEN: | |
689 | FC_DBG("CPU %x online: Create Rx thread\n", cpu); | |
690 | fcoe_percpu_thread_create(cpu); | |
691 | break; | |
692 | case CPU_DEAD: | |
693 | case CPU_DEAD_FROZEN: | |
694 | FC_DBG("CPU %x offline: Remove Rx thread\n", cpu); | |
695 | fcoe_percpu_thread_destroy(cpu); | |
696 | break; | |
697 | default: | |
698 | break; | |
699 | } | |
700 | return NOTIFY_OK; | |
701 | } | |
702 | ||
703 | static struct notifier_block fcoe_cpu_notifier = { | |
704 | .notifier_call = fcoe_cpu_callback, | |
705 | }; | |
706 | ||
85b4aa49 | 707 | /** |
34f42a07 | 708 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
709 | * @skb: the receive skb |
710 | * @dev: associated net device | |
711 | * @ptype: context | |
712 | * @odldev: last device | |
713 | * | |
714 | * this function will receive the packet and build fc frame and pass it up | |
715 | * | |
716 | * Returns: 0 for success | |
34f42a07 | 717 | */ |
85b4aa49 RL |
718 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
719 | struct packet_type *ptype, struct net_device *olddev) | |
720 | { | |
721 | struct fc_lport *lp; | |
722 | struct fcoe_rcv_info *fr; | |
723 | struct fcoe_softc *fc; | |
85b4aa49 | 724 | struct fc_frame_header *fh; |
85b4aa49 | 725 | struct fcoe_percpu_s *fps; |
38eccabd | 726 | unsigned short oxid; |
8976f424 | 727 | unsigned int cpu = 0; |
85b4aa49 RL |
728 | |
729 | fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); | |
730 | lp = fc->lp; | |
731 | if (unlikely(lp == NULL)) { | |
732 | FC_DBG("cannot find hba structure"); | |
733 | goto err2; | |
734 | } | |
735 | ||
736 | if (unlikely(debug_fcoe)) { | |
737 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p " | |
738 | "end:%p sum:%d dev:%s", skb->len, skb->data_len, | |
739 | skb->head, skb->data, skb_tail_pointer(skb), | |
740 | skb_end_pointer(skb), skb->csum, | |
741 | skb->dev ? skb->dev->name : "<NULL>"); | |
742 | ||
743 | } | |
744 | ||
745 | /* check for FCOE packet type */ | |
746 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
747 | FC_DBG("wrong FC type frame"); | |
748 | goto err; | |
749 | } | |
750 | ||
751 | /* | |
752 | * Check for minimum frame length, and make sure required FCoE | |
753 | * and FC headers are pulled into the linear data area. | |
754 | */ | |
755 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
756 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
757 | goto err; | |
758 | ||
759 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
760 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
761 | ||
762 | oxid = ntohs(fh->fh_ox_id); | |
763 | ||
764 | fr = fcoe_dev_from_skb(skb); | |
765 | fr->fr_dev = lp; | |
766 | fr->ptype = ptype; | |
5e5e92df | 767 | |
85b4aa49 RL |
768 | #ifdef CONFIG_SMP |
769 | /* | |
770 | * The incoming frame exchange id(oxid) is ANDed with num of online | |
8976f424 RL |
771 | * cpu bits to get cpu and then this cpu is used for selecting |
772 | * a per cpu kernel thread from fcoe_percpu. | |
85b4aa49 | 773 | */ |
8976f424 | 774 | cpu = oxid & (num_online_cpus() - 1); |
85b4aa49 | 775 | #endif |
5e5e92df | 776 | |
8976f424 | 777 | fps = &per_cpu(fcoe_percpu, cpu); |
85b4aa49 | 778 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
8976f424 RL |
779 | if (unlikely(!fps->thread)) { |
780 | /* | |
781 | * The targeted CPU is not ready, let's target | |
782 | * the first CPU now. For non-SMP systems this | |
783 | * will check the same CPU twice. | |
784 | */ | |
785 | FC_DBG("CPU is online, but no receive thread ready " | |
786 | "for incoming skb- using first online CPU.\n"); | |
787 | ||
788 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
789 | cpu = first_cpu(cpu_online_map); | |
790 | fps = &per_cpu(fcoe_percpu, cpu); | |
791 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
792 | if (!fps->thread) { | |
793 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
794 | goto err; | |
795 | } | |
796 | } | |
797 | ||
798 | /* | |
799 | * We now have a valid CPU that we're targeting for | |
800 | * this skb. We also have this receive thread locked, | |
801 | * so we're free to queue skbs into it's queue. | |
802 | */ | |
85b4aa49 RL |
803 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
804 | if (fps->fcoe_rx_list.qlen == 1) | |
805 | wake_up_process(fps->thread); | |
806 | ||
807 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
808 | ||
809 | return 0; | |
810 | err: | |
582b45bc | 811 | fc_lport_get_stats(lp)->ErrorFrames++; |
85b4aa49 RL |
812 | |
813 | err2: | |
814 | kfree_skb(skb); | |
815 | return -1; | |
816 | } | |
817 | EXPORT_SYMBOL_GPL(fcoe_rcv); | |
818 | ||
819 | /** | |
34f42a07 | 820 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
821 | * @skb: the skb to be xmitted |
822 | * | |
823 | * Returns: 0 for success | |
34f42a07 | 824 | */ |
85b4aa49 RL |
825 | static inline int fcoe_start_io(struct sk_buff *skb) |
826 | { | |
827 | int rc; | |
828 | ||
829 | skb_get(skb); | |
830 | rc = dev_queue_xmit(skb); | |
831 | if (rc != 0) | |
832 | return rc; | |
833 | kfree_skb(skb); | |
834 | return 0; | |
835 | } | |
836 | ||
837 | /** | |
34f42a07 | 838 | * fcoe_get_paged_crc_eof() - in case we need alloc a page for crc_eof |
85b4aa49 RL |
839 | * @skb: the skb to be xmitted |
840 | * @tlen: total len | |
841 | * | |
842 | * Returns: 0 for success | |
34f42a07 | 843 | */ |
85b4aa49 RL |
844 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
845 | { | |
846 | struct fcoe_percpu_s *fps; | |
847 | struct page *page; | |
85b4aa49 | 848 | |
5e5e92df | 849 | fps = &get_cpu_var(fcoe_percpu); |
85b4aa49 RL |
850 | page = fps->crc_eof_page; |
851 | if (!page) { | |
852 | page = alloc_page(GFP_ATOMIC); | |
853 | if (!page) { | |
5e5e92df | 854 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
855 | return -ENOMEM; |
856 | } | |
857 | fps->crc_eof_page = page; | |
8976f424 | 858 | fps->crc_eof_offset = 0; |
85b4aa49 RL |
859 | } |
860 | ||
861 | get_page(page); | |
862 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
863 | fps->crc_eof_offset, tlen); | |
864 | skb->len += tlen; | |
865 | skb->data_len += tlen; | |
866 | skb->truesize += tlen; | |
867 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
868 | ||
869 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
870 | fps->crc_eof_page = NULL; | |
871 | fps->crc_eof_offset = 0; | |
872 | put_page(page); | |
873 | } | |
5e5e92df | 874 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
875 | return 0; |
876 | } | |
877 | ||
878 | /** | |
34f42a07 | 879 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
85b4aa49 RL |
880 | * @fp: the fc_frame containg data to be checksummed |
881 | * | |
882 | * This uses crc32() to calculate the crc for fc frame | |
883 | * Return : 32 bit crc | |
34f42a07 | 884 | */ |
85b4aa49 RL |
885 | u32 fcoe_fc_crc(struct fc_frame *fp) |
886 | { | |
887 | struct sk_buff *skb = fp_skb(fp); | |
888 | struct skb_frag_struct *frag; | |
889 | unsigned char *data; | |
890 | unsigned long off, len, clen; | |
891 | u32 crc; | |
892 | unsigned i; | |
893 | ||
894 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
895 | ||
896 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
897 | frag = &skb_shinfo(skb)->frags[i]; | |
898 | off = frag->page_offset; | |
899 | len = frag->size; | |
900 | while (len > 0) { | |
901 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
902 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
903 | KM_SKB_DATA_SOFTIRQ); | |
904 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
905 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
906 | off += clen; | |
907 | len -= clen; | |
908 | } | |
909 | } | |
910 | return crc; | |
911 | } | |
85b4aa49 RL |
912 | |
913 | /** | |
34f42a07 | 914 | * fcoe_xmit() - FCoE frame transmit function |
85b4aa49 RL |
915 | * @lp: the associated local port |
916 | * @fp: the fc_frame to be transmitted | |
917 | * | |
918 | * Return : 0 for success | |
34f42a07 | 919 | */ |
85b4aa49 RL |
920 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
921 | { | |
922 | int wlen, rc = 0; | |
923 | u32 crc; | |
924 | struct ethhdr *eh; | |
925 | struct fcoe_crc_eof *cp; | |
926 | struct sk_buff *skb; | |
927 | struct fcoe_dev_stats *stats; | |
928 | struct fc_frame_header *fh; | |
929 | unsigned int hlen; /* header length implies the version */ | |
930 | unsigned int tlen; /* trailer length */ | |
931 | unsigned int elen; /* eth header, may include vlan */ | |
932 | int flogi_in_progress = 0; | |
933 | struct fcoe_softc *fc; | |
934 | u8 sof, eof; | |
935 | struct fcoe_hdr *hp; | |
936 | ||
937 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
938 | ||
fc47ff6b | 939 | fc = lport_priv(lp); |
85b4aa49 RL |
940 | /* |
941 | * if it is a flogi then we need to learn gw-addr | |
942 | * and my own fcid | |
943 | */ | |
944 | fh = fc_frame_header_get(fp); | |
945 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) { | |
946 | if (fc_frame_payload_op(fp) == ELS_FLOGI) { | |
947 | fc->flogi_oxid = ntohs(fh->fh_ox_id); | |
948 | fc->address_mode = FCOE_FCOUI_ADDR_MODE; | |
949 | fc->flogi_progress = 1; | |
950 | flogi_in_progress = 1; | |
951 | } else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) { | |
952 | /* | |
953 | * Here we must've gotten an SID by accepting an FLOGI | |
954 | * from a point-to-point connection. Switch to using | |
955 | * the source mac based on the SID. The destination | |
956 | * MAC in this case would have been set by receving the | |
957 | * FLOGI. | |
958 | */ | |
959 | fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id); | |
960 | fc->flogi_progress = 0; | |
961 | } | |
962 | } | |
963 | ||
964 | skb = fp_skb(fp); | |
965 | sof = fr_sof(fp); | |
966 | eof = fr_eof(fp); | |
967 | ||
968 | elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ? | |
969 | sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr); | |
970 | hlen = sizeof(struct fcoe_hdr); | |
971 | tlen = sizeof(struct fcoe_crc_eof); | |
972 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
973 | ||
974 | /* crc offload */ | |
975 | if (likely(lp->crc_offload)) { | |
39ca9a06 | 976 | skb->ip_summed = CHECKSUM_PARTIAL; |
85b4aa49 RL |
977 | skb->csum_start = skb_headroom(skb); |
978 | skb->csum_offset = skb->len; | |
979 | crc = 0; | |
980 | } else { | |
981 | skb->ip_summed = CHECKSUM_NONE; | |
982 | crc = fcoe_fc_crc(fp); | |
983 | } | |
984 | ||
985 | /* copy fc crc and eof to the skb buff */ | |
986 | if (skb_is_nonlinear(skb)) { | |
987 | skb_frag_t *frag; | |
988 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 989 | kfree_skb(skb); |
85b4aa49 RL |
990 | return -ENOMEM; |
991 | } | |
992 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
993 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
994 | + frag->page_offset; | |
995 | } else { | |
996 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
997 | } | |
998 | ||
999 | memset(cp, 0, sizeof(*cp)); | |
1000 | cp->fcoe_eof = eof; | |
1001 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
1002 | ||
1003 | if (skb_is_nonlinear(skb)) { | |
1004 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
1005 | cp = NULL; | |
1006 | } | |
1007 | ||
1008 | /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */ | |
1009 | skb_push(skb, elen + hlen); | |
1010 | skb_reset_mac_header(skb); | |
1011 | skb_reset_network_header(skb); | |
1012 | skb->mac_len = elen; | |
211c738d | 1013 | skb->protocol = htons(ETH_P_FCOE); |
85b4aa49 RL |
1014 | skb->dev = fc->real_dev; |
1015 | ||
1016 | /* fill up mac and fcoe headers */ | |
1017 | eh = eth_hdr(skb); | |
1018 | eh->h_proto = htons(ETH_P_FCOE); | |
1019 | if (fc->address_mode == FCOE_FCOUI_ADDR_MODE) | |
1020 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); | |
1021 | else | |
1022 | /* insert GW address */ | |
1023 | memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN); | |
1024 | ||
1025 | if (unlikely(flogi_in_progress)) | |
1026 | memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN); | |
1027 | else | |
1028 | memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN); | |
1029 | ||
1030 | hp = (struct fcoe_hdr *)(eh + 1); | |
1031 | memset(hp, 0, sizeof(*hp)); | |
1032 | if (FC_FCOE_VER) | |
1033 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
1034 | hp->fcoe_sof = sof; | |
1035 | ||
39ca9a06 YZ |
1036 | #ifdef NETIF_F_FSO |
1037 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ | |
1038 | if (lp->seq_offload && fr_max_payload(fp)) { | |
1039 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; | |
1040 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); | |
1041 | } else { | |
1042 | skb_shinfo(skb)->gso_type = 0; | |
1043 | skb_shinfo(skb)->gso_size = 0; | |
1044 | } | |
1045 | #endif | |
85b4aa49 | 1046 | /* update tx stats: regardless if LLD fails */ |
582b45bc RL |
1047 | stats = fc_lport_get_stats(lp); |
1048 | stats->TxFrames++; | |
1049 | stats->TxWords += wlen; | |
85b4aa49 RL |
1050 | |
1051 | /* send down to lld */ | |
1052 | fr_dev(fp) = lp; | |
1053 | if (fc->fcoe_pending_queue.qlen) | |
1054 | rc = fcoe_check_wait_queue(lp); | |
1055 | ||
1056 | if (rc == 0) | |
1057 | rc = fcoe_start_io(skb); | |
1058 | ||
1059 | if (rc) { | |
55c8bafb CL |
1060 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
1061 | __skb_queue_tail(&fc->fcoe_pending_queue, skb); | |
1062 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
85b4aa49 | 1063 | if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
bc0e17f6 | 1064 | lp->qfull = 1; |
85b4aa49 RL |
1065 | } |
1066 | ||
1067 | return 0; | |
1068 | } | |
1069 | EXPORT_SYMBOL_GPL(fcoe_xmit); | |
1070 | ||
34f42a07 RL |
1071 | /** |
1072 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
1073 | * @arg: ptr to the fcoe per cpu struct |
1074 | * | |
1075 | * Return: 0 for success | |
85b4aa49 RL |
1076 | */ |
1077 | int fcoe_percpu_receive_thread(void *arg) | |
1078 | { | |
1079 | struct fcoe_percpu_s *p = arg; | |
1080 | u32 fr_len; | |
1081 | struct fc_lport *lp; | |
1082 | struct fcoe_rcv_info *fr; | |
1083 | struct fcoe_dev_stats *stats; | |
1084 | struct fc_frame_header *fh; | |
1085 | struct sk_buff *skb; | |
1086 | struct fcoe_crc_eof crc_eof; | |
1087 | struct fc_frame *fp; | |
1088 | u8 *mac = NULL; | |
1089 | struct fcoe_softc *fc; | |
1090 | struct fcoe_hdr *hp; | |
1091 | ||
4469c195 | 1092 | set_user_nice(current, -20); |
85b4aa49 RL |
1093 | |
1094 | while (!kthread_should_stop()) { | |
1095 | ||
1096 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1097 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
1098 | set_current_state(TASK_INTERRUPTIBLE); | |
1099 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1100 | schedule(); | |
1101 | set_current_state(TASK_RUNNING); | |
1102 | if (kthread_should_stop()) | |
1103 | return 0; | |
1104 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1105 | } | |
1106 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1107 | fr = fcoe_dev_from_skb(skb); | |
1108 | lp = fr->fr_dev; | |
1109 | if (unlikely(lp == NULL)) { | |
1110 | FC_DBG("invalid HBA Structure"); | |
1111 | kfree_skb(skb); | |
1112 | continue; | |
1113 | } | |
1114 | ||
85b4aa49 RL |
1115 | if (unlikely(debug_fcoe)) { |
1116 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p " | |
1117 | "tail:%p end:%p sum:%d dev:%s", | |
1118 | skb->len, skb->data_len, | |
1119 | skb->head, skb->data, skb_tail_pointer(skb), | |
1120 | skb_end_pointer(skb), skb->csum, | |
1121 | skb->dev ? skb->dev->name : "<NULL>"); | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Save source MAC address before discarding header. | |
1126 | */ | |
1127 | fc = lport_priv(lp); | |
1128 | if (unlikely(fc->flogi_progress)) | |
1129 | mac = eth_hdr(skb)->h_source; | |
1130 | ||
1131 | if (skb_is_nonlinear(skb)) | |
1132 | skb_linearize(skb); /* not ideal */ | |
1133 | ||
1134 | /* | |
1135 | * Frame length checks and setting up the header pointers | |
1136 | * was done in fcoe_rcv already. | |
1137 | */ | |
1138 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
1139 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1140 | ||
582b45bc | 1141 | stats = fc_lport_get_stats(lp); |
85b4aa49 | 1142 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
582b45bc RL |
1143 | if (stats->ErrorFrames < 5) |
1144 | printk(KERN_WARNING "FCoE version " | |
1145 | "mismatch: The frame has " | |
1146 | "version %x, but the " | |
1147 | "initiator supports version " | |
1148 | "%x\n", FC_FCOE_DECAPS_VER(hp), | |
1149 | FC_FCOE_VER); | |
1150 | stats->ErrorFrames++; | |
85b4aa49 RL |
1151 | kfree_skb(skb); |
1152 | continue; | |
1153 | } | |
1154 | ||
1155 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
1156 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
1157 | ||
582b45bc RL |
1158 | stats->RxFrames++; |
1159 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
85b4aa49 RL |
1160 | |
1161 | fp = (struct fc_frame *)skb; | |
1162 | fc_frame_init(fp); | |
1163 | fr_dev(fp) = lp; | |
1164 | fr_sof(fp) = hp->fcoe_sof; | |
1165 | ||
1166 | /* Copy out the CRC and EOF trailer for access */ | |
1167 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
1168 | kfree_skb(skb); | |
1169 | continue; | |
1170 | } | |
1171 | fr_eof(fp) = crc_eof.fcoe_eof; | |
1172 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
1173 | if (pskb_trim(skb, fr_len)) { | |
1174 | kfree_skb(skb); | |
1175 | continue; | |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * We only check CRC if no offload is available and if it is | |
1180 | * it's solicited data, in which case, the FCP layer would | |
1181 | * check it during the copy. | |
1182 | */ | |
07c00ec4 | 1183 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
85b4aa49 RL |
1184 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
1185 | else | |
1186 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
1187 | ||
1188 | fh = fc_frame_header_get(fp); | |
1189 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
1190 | fh->fh_type == FC_TYPE_FCP) { | |
1191 | fc_exch_recv(lp, lp->emp, fp); | |
1192 | continue; | |
1193 | } | |
1194 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
1195 | if (le32_to_cpu(fr_crc(fp)) != | |
1196 | ~crc32(~0, skb->data, fr_len)) { | |
1197 | if (debug_fcoe || stats->InvalidCRCCount < 5) | |
1198 | printk(KERN_WARNING "fcoe: dropping " | |
1199 | "frame with CRC error\n"); | |
1200 | stats->InvalidCRCCount++; | |
1201 | stats->ErrorFrames++; | |
1202 | fc_frame_free(fp); | |
1203 | continue; | |
1204 | } | |
1205 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
1206 | } | |
1207 | /* non flogi and non data exchanges are handled here */ | |
1208 | if (unlikely(fc->flogi_progress)) | |
1209 | fcoe_recv_flogi(fc, fp, mac); | |
1210 | fc_exch_recv(lp, lp->emp, fp); | |
1211 | } | |
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | /** | |
34f42a07 | 1216 | * fcoe_recv_flogi() - flogi receive function |
85b4aa49 RL |
1217 | * @fc: associated fcoe_softc |
1218 | * @fp: the recieved frame | |
1219 | * @sa: the source address of this flogi | |
1220 | * | |
1221 | * This is responsible to parse the flogi response and sets the corresponding | |
1222 | * mac address for the initiator, eitehr OUI based or GW based. | |
1223 | * | |
1224 | * Returns: none | |
34f42a07 | 1225 | */ |
85b4aa49 RL |
1226 | static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa) |
1227 | { | |
1228 | struct fc_frame_header *fh; | |
1229 | u8 op; | |
1230 | ||
1231 | fh = fc_frame_header_get(fp); | |
1232 | if (fh->fh_type != FC_TYPE_ELS) | |
1233 | return; | |
1234 | op = fc_frame_payload_op(fp); | |
1235 | if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP && | |
1236 | fc->flogi_oxid == ntohs(fh->fh_ox_id)) { | |
1237 | /* | |
1238 | * FLOGI accepted. | |
1239 | * If the src mac addr is FC_OUI-based, then we mark the | |
1240 | * address_mode flag to use FC_OUI-based Ethernet DA. | |
1241 | * Otherwise we use the FCoE gateway addr | |
1242 | */ | |
1243 | if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) { | |
1244 | fc->address_mode = FCOE_FCOUI_ADDR_MODE; | |
1245 | } else { | |
1246 | memcpy(fc->dest_addr, sa, ETH_ALEN); | |
1247 | fc->address_mode = FCOE_GW_ADDR_MODE; | |
1248 | } | |
1249 | ||
1250 | /* | |
1251 | * Remove any previously-set unicast MAC filter. | |
1252 | * Add secondary FCoE MAC address filter for our OUI. | |
1253 | */ | |
1254 | rtnl_lock(); | |
1255 | if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 })) | |
1256 | dev_unicast_delete(fc->real_dev, fc->data_src_addr, | |
1257 | ETH_ALEN); | |
1258 | fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id); | |
1259 | dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN); | |
1260 | rtnl_unlock(); | |
1261 | ||
1262 | fc->flogi_progress = 0; | |
1263 | } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) { | |
1264 | /* | |
1265 | * Save source MAC for point-to-point responses. | |
1266 | */ | |
1267 | memcpy(fc->dest_addr, sa, ETH_ALEN); | |
1268 | fc->address_mode = FCOE_GW_ADDR_MODE; | |
1269 | } | |
1270 | } | |
1271 | ||
1272 | /** | |
34f42a07 | 1273 | * fcoe_watchdog() - fcoe timer callback |
85b4aa49 RL |
1274 | * @vp: |
1275 | * | |
bc0e17f6 | 1276 | * This checks the pending queue length for fcoe and set lport qfull |
85b4aa49 RL |
1277 | * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the |
1278 | * fcoe_hostlist. | |
1279 | * | |
1280 | * Returns: 0 for success | |
34f42a07 | 1281 | */ |
85b4aa49 RL |
1282 | void fcoe_watchdog(ulong vp) |
1283 | { | |
85b4aa49 | 1284 | struct fcoe_softc *fc; |
85b4aa49 RL |
1285 | |
1286 | read_lock(&fcoe_hostlist_lock); | |
1287 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
c826a314 VD |
1288 | if (fc->lp) |
1289 | fcoe_check_wait_queue(fc->lp); | |
85b4aa49 RL |
1290 | } |
1291 | read_unlock(&fcoe_hostlist_lock); | |
1292 | ||
1293 | fcoe_timer.expires = jiffies + (1 * HZ); | |
1294 | add_timer(&fcoe_timer); | |
1295 | } | |
1296 | ||
1297 | ||
1298 | /** | |
34f42a07 | 1299 | * fcoe_check_wait_queue() - put the skb into fcoe pending xmit queue |
85b4aa49 RL |
1300 | * @lp: the fc_port for this skb |
1301 | * @skb: the associated skb to be xmitted | |
1302 | * | |
1303 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
1304 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 VD |
1305 | * transmitted, return qlen or -1 if a error occurs, then restore |
1306 | * wait_queue and try again later. | |
85b4aa49 RL |
1307 | * |
1308 | * The wait_queue is used when the skb transmit fails. skb will go | |
1309 | * in the wait_queue which will be emptied by the time function OR | |
1310 | * by the next skb transmit. | |
1311 | * | |
1312 | * Returns: 0 for success | |
34f42a07 | 1313 | */ |
85b4aa49 RL |
1314 | static int fcoe_check_wait_queue(struct fc_lport *lp) |
1315 | { | |
55c8bafb | 1316 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 | 1317 | struct sk_buff *skb; |
c826a314 | 1318 | int rc = -1; |
85b4aa49 | 1319 | |
85b4aa49 | 1320 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
c826a314 VD |
1321 | if (fc->fcoe_pending_queue_active) |
1322 | goto out; | |
1323 | fc->fcoe_pending_queue_active = 1; | |
55c8bafb CL |
1324 | |
1325 | while (fc->fcoe_pending_queue.qlen) { | |
1326 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
1327 | fc->fcoe_pending_queue.qlen++; | |
1328 | skb = __skb_dequeue(&fc->fcoe_pending_queue); | |
1329 | ||
1330 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1331 | rc = fcoe_start_io(skb); | |
1332 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1333 | ||
1334 | if (rc) { | |
1335 | __skb_queue_head(&fc->fcoe_pending_queue, skb); | |
1336 | /* undo temporary increment above */ | |
1337 | fc->fcoe_pending_queue.qlen--; | |
1338 | break; | |
85b4aa49 | 1339 | } |
55c8bafb CL |
1340 | /* undo temporary increment above */ |
1341 | fc->fcoe_pending_queue.qlen--; | |
85b4aa49 | 1342 | } |
55c8bafb CL |
1343 | |
1344 | if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) | |
1345 | lp->qfull = 0; | |
c826a314 VD |
1346 | fc->fcoe_pending_queue_active = 0; |
1347 | rc = fc->fcoe_pending_queue.qlen; | |
1348 | out: | |
85b4aa49 | 1349 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
c826a314 | 1350 | return rc; |
85b4aa49 RL |
1351 | } |
1352 | ||
85b4aa49 | 1353 | /** |
34f42a07 RL |
1354 | * fcoe_dev_setup() - setup link change notification interface |
1355 | */ | |
1356 | static void fcoe_dev_setup() | |
85b4aa49 RL |
1357 | { |
1358 | /* | |
1359 | * here setup a interface specific wd time to | |
1360 | * monitor the link state | |
1361 | */ | |
1362 | register_netdevice_notifier(&fcoe_notifier); | |
1363 | } | |
1364 | ||
1365 | /** | |
34f42a07 RL |
1366 | * fcoe_dev_setup() - cleanup link change notification interface |
1367 | */ | |
85b4aa49 RL |
1368 | static void fcoe_dev_cleanup(void) |
1369 | { | |
1370 | unregister_netdevice_notifier(&fcoe_notifier); | |
1371 | } | |
1372 | ||
1373 | /** | |
34f42a07 | 1374 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
1375 | * @notifier: context of the notification |
1376 | * @event: type of event | |
1377 | * @ptr: fixed array for output parsed ifname | |
1378 | * | |
1379 | * This function is called by the ethernet driver in case of link change event | |
1380 | * | |
1381 | * Returns: 0 for success | |
34f42a07 | 1382 | */ |
85b4aa49 RL |
1383 | static int fcoe_device_notification(struct notifier_block *notifier, |
1384 | ulong event, void *ptr) | |
1385 | { | |
1386 | struct fc_lport *lp = NULL; | |
1387 | struct net_device *real_dev = ptr; | |
1388 | struct fcoe_softc *fc; | |
1389 | struct fcoe_dev_stats *stats; | |
bc0e17f6 | 1390 | u32 new_link_up; |
85b4aa49 RL |
1391 | u32 mfs; |
1392 | int rc = NOTIFY_OK; | |
1393 | ||
1394 | read_lock(&fcoe_hostlist_lock); | |
1395 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1396 | if (fc->real_dev == real_dev) { | |
1397 | lp = fc->lp; | |
1398 | break; | |
1399 | } | |
1400 | } | |
1401 | read_unlock(&fcoe_hostlist_lock); | |
1402 | if (lp == NULL) { | |
1403 | rc = NOTIFY_DONE; | |
1404 | goto out; | |
1405 | } | |
1406 | ||
bc0e17f6 | 1407 | new_link_up = lp->link_up; |
85b4aa49 RL |
1408 | switch (event) { |
1409 | case NETDEV_DOWN: | |
1410 | case NETDEV_GOING_DOWN: | |
bc0e17f6 | 1411 | new_link_up = 0; |
85b4aa49 RL |
1412 | break; |
1413 | case NETDEV_UP: | |
1414 | case NETDEV_CHANGE: | |
bc0e17f6 | 1415 | new_link_up = !fcoe_link_ok(lp); |
85b4aa49 RL |
1416 | break; |
1417 | case NETDEV_CHANGEMTU: | |
1418 | mfs = fc->real_dev->mtu - | |
1419 | (sizeof(struct fcoe_hdr) + | |
1420 | sizeof(struct fcoe_crc_eof)); | |
1421 | if (mfs >= FC_MIN_MAX_FRAME) | |
1422 | fc_set_mfs(lp, mfs); | |
bc0e17f6 | 1423 | new_link_up = !fcoe_link_ok(lp); |
85b4aa49 RL |
1424 | break; |
1425 | case NETDEV_REGISTER: | |
1426 | break; | |
1427 | default: | |
1428 | FC_DBG("unknown event %ld call", event); | |
1429 | } | |
bc0e17f6 VD |
1430 | if (lp->link_up != new_link_up) { |
1431 | if (new_link_up) | |
85b4aa49 RL |
1432 | fc_linkup(lp); |
1433 | else { | |
582b45bc RL |
1434 | stats = fc_lport_get_stats(lp); |
1435 | stats->LinkFailureCount++; | |
85b4aa49 RL |
1436 | fc_linkdown(lp); |
1437 | fcoe_clean_pending_queue(lp); | |
1438 | } | |
1439 | } | |
1440 | out: | |
1441 | return rc; | |
1442 | } | |
1443 | ||
1444 | /** | |
34f42a07 | 1445 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
1446 | * @ifname: fixed array for output parsed ifname |
1447 | * @buffer: incoming buffer to be copied | |
1448 | * | |
1449 | * Returns: NULL or ptr to netdeive | |
34f42a07 | 1450 | */ |
85b4aa49 RL |
1451 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
1452 | { | |
1453 | char *cp; | |
1454 | char ifname[IFNAMSIZ + 2]; | |
1455 | ||
1456 | if (buffer) { | |
1457 | strlcpy(ifname, buffer, IFNAMSIZ); | |
1458 | cp = ifname + strlen(ifname); | |
1459 | while (--cp >= ifname && *cp == '\n') | |
1460 | *cp = '\0'; | |
1461 | return dev_get_by_name(&init_net, ifname); | |
1462 | } | |
1463 | return NULL; | |
1464 | } | |
1465 | ||
1466 | /** | |
34f42a07 | 1467 | * fcoe_netdev_to_module_owner() - finds out the nic drive moddule of the netdev |
85b4aa49 RL |
1468 | * @netdev: the target netdev |
1469 | * | |
1470 | * Returns: ptr to the struct module, NULL for failure | |
34f42a07 | 1471 | */ |
b2ab99c9 RL |
1472 | static struct module * |
1473 | fcoe_netdev_to_module_owner(const struct net_device *netdev) | |
85b4aa49 RL |
1474 | { |
1475 | struct device *dev; | |
1476 | ||
1477 | if (!netdev) | |
1478 | return NULL; | |
1479 | ||
1480 | dev = netdev->dev.parent; | |
1481 | if (!dev) | |
1482 | return NULL; | |
1483 | ||
1484 | if (!dev->driver) | |
1485 | return NULL; | |
1486 | ||
1487 | return dev->driver->owner; | |
1488 | } | |
1489 | ||
1490 | /** | |
34f42a07 | 1491 | * fcoe_ethdrv_get() - Hold the Ethernet driver |
85b4aa49 RL |
1492 | * @netdev: the target netdev |
1493 | * | |
34f42a07 RL |
1494 | * Holds the Ethernet driver module by try_module_get() for |
1495 | * the corresponding netdev. | |
1496 | * | |
85b4aa49 | 1497 | * Returns: 0 for succsss |
34f42a07 | 1498 | */ |
85b4aa49 RL |
1499 | static int fcoe_ethdrv_get(const struct net_device *netdev) |
1500 | { | |
1501 | struct module *owner; | |
1502 | ||
1503 | owner = fcoe_netdev_to_module_owner(netdev); | |
1504 | if (owner) { | |
56b854bb JB |
1505 | printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n", |
1506 | module_name(owner), netdev->name); | |
85b4aa49 RL |
1507 | return try_module_get(owner); |
1508 | } | |
1509 | return -ENODEV; | |
1510 | } | |
1511 | ||
1512 | /** | |
34f42a07 | 1513 | * fcoe_ethdrv_put() - Release the Ethernet driver |
85b4aa49 RL |
1514 | * @netdev: the target netdev |
1515 | * | |
34f42a07 RL |
1516 | * Releases the Ethernet driver module by module_put for |
1517 | * the corresponding netdev. | |
1518 | * | |
85b4aa49 | 1519 | * Returns: 0 for succsss |
34f42a07 | 1520 | */ |
85b4aa49 RL |
1521 | static int fcoe_ethdrv_put(const struct net_device *netdev) |
1522 | { | |
1523 | struct module *owner; | |
1524 | ||
1525 | owner = fcoe_netdev_to_module_owner(netdev); | |
1526 | if (owner) { | |
56b854bb JB |
1527 | printk(KERN_DEBUG "fcoe:release driver module %s for %s\n", |
1528 | module_name(owner), netdev->name); | |
85b4aa49 RL |
1529 | module_put(owner); |
1530 | return 0; | |
1531 | } | |
1532 | return -ENODEV; | |
1533 | } | |
1534 | ||
1535 | /** | |
34f42a07 | 1536 | * fcoe_destroy() - handles the destroy from sysfs |
85b4aa49 RL |
1537 | * @buffer: expcted to be a eth if name |
1538 | * @kp: associated kernel param | |
1539 | * | |
1540 | * Returns: 0 for success | |
34f42a07 | 1541 | */ |
85b4aa49 RL |
1542 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
1543 | { | |
1544 | int rc; | |
1545 | struct net_device *netdev; | |
1546 | ||
1547 | netdev = fcoe_if_to_netdev(buffer); | |
1548 | if (!netdev) { | |
1549 | rc = -ENODEV; | |
1550 | goto out_nodev; | |
1551 | } | |
1552 | /* look for existing lport */ | |
1553 | if (!fcoe_hostlist_lookup(netdev)) { | |
1554 | rc = -ENODEV; | |
1555 | goto out_putdev; | |
1556 | } | |
7f349142 | 1557 | rc = fcoe_if_destroy(netdev); |
85b4aa49 | 1558 | if (rc) { |
7f349142 | 1559 | printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n", |
85b4aa49 RL |
1560 | netdev->name); |
1561 | rc = -EIO; | |
1562 | goto out_putdev; | |
1563 | } | |
1564 | fcoe_ethdrv_put(netdev); | |
1565 | rc = 0; | |
1566 | out_putdev: | |
1567 | dev_put(netdev); | |
1568 | out_nodev: | |
1569 | return rc; | |
1570 | } | |
1571 | ||
1572 | /** | |
34f42a07 | 1573 | * fcoe_create() - Handles the create call from sysfs |
85b4aa49 RL |
1574 | * @buffer: expcted to be a eth if name |
1575 | * @kp: associated kernel param | |
1576 | * | |
1577 | * Returns: 0 for success | |
34f42a07 | 1578 | */ |
85b4aa49 RL |
1579 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1580 | { | |
1581 | int rc; | |
1582 | struct net_device *netdev; | |
1583 | ||
1584 | netdev = fcoe_if_to_netdev(buffer); | |
1585 | if (!netdev) { | |
1586 | rc = -ENODEV; | |
1587 | goto out_nodev; | |
1588 | } | |
1589 | /* look for existing lport */ | |
1590 | if (fcoe_hostlist_lookup(netdev)) { | |
1591 | rc = -EEXIST; | |
1592 | goto out_putdev; | |
1593 | } | |
1594 | fcoe_ethdrv_get(netdev); | |
1595 | ||
7f349142 | 1596 | rc = fcoe_if_create(netdev); |
85b4aa49 | 1597 | if (rc) { |
7f349142 | 1598 | printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n", |
85b4aa49 RL |
1599 | netdev->name); |
1600 | fcoe_ethdrv_put(netdev); | |
1601 | rc = -EIO; | |
1602 | goto out_putdev; | |
1603 | } | |
1604 | rc = 0; | |
1605 | out_putdev: | |
1606 | dev_put(netdev); | |
1607 | out_nodev: | |
1608 | return rc; | |
1609 | } | |
1610 | ||
1611 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1612 | __MODULE_PARM_TYPE(create, "string"); | |
1613 | MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); | |
1614 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); | |
1615 | __MODULE_PARM_TYPE(destroy, "string"); | |
1616 | MODULE_PARM_DESC(destroy, "Destroy fcoe port"); | |
1617 | ||
34f42a07 RL |
1618 | /** |
1619 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1620 | * @lp: ptr to the fc_lport |
1621 | * | |
1622 | * Any permanently-disqualifying conditions have been previously checked. | |
1623 | * This also updates the speed setting, which may change with link for 100/1000. | |
1624 | * | |
1625 | * This function should probably be checking for PAUSE support at some point | |
1626 | * in the future. Currently Per-priority-pause is not determinable using | |
1627 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1628 | * | |
1629 | * Returns: 0 if link is OK for use by FCoE. | |
1630 | * | |
1631 | */ | |
1632 | int fcoe_link_ok(struct fc_lport *lp) | |
1633 | { | |
fc47ff6b | 1634 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 RL |
1635 | struct net_device *dev = fc->real_dev; |
1636 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; | |
1637 | int rc = 0; | |
1638 | ||
1639 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) { | |
1640 | dev = fc->phys_dev; | |
1641 | if (dev->ethtool_ops->get_settings) { | |
1642 | dev->ethtool_ops->get_settings(dev, &ecmd); | |
1643 | lp->link_supported_speeds &= | |
1644 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1645 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1646 | SUPPORTED_1000baseT_Full)) | |
1647 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1648 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1649 | lp->link_supported_speeds |= | |
1650 | FC_PORTSPEED_10GBIT; | |
1651 | if (ecmd.speed == SPEED_1000) | |
1652 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1653 | if (ecmd.speed == SPEED_10000) | |
1654 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
1655 | } | |
1656 | } else | |
1657 | rc = -1; | |
1658 | ||
1659 | return rc; | |
1660 | } | |
1661 | EXPORT_SYMBOL_GPL(fcoe_link_ok); | |
1662 | ||
34f42a07 RL |
1663 | /** |
1664 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 RL |
1665 | * @lp: the fc_lport |
1666 | */ | |
1667 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1668 | { | |
85b4aa49 RL |
1669 | struct fcoe_percpu_s *pp; |
1670 | struct fcoe_rcv_info *fr; | |
1671 | struct sk_buff_head *list; | |
1672 | struct sk_buff *skb, *next; | |
1673 | struct sk_buff *head; | |
5e5e92df | 1674 | unsigned int cpu; |
85b4aa49 | 1675 | |
5e5e92df RL |
1676 | for_each_possible_cpu(cpu) { |
1677 | pp = &per_cpu(fcoe_percpu, cpu); | |
1678 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1679 | list = &pp->fcoe_rx_list; | |
1680 | head = list->next; | |
1681 | for (skb = head; skb != (struct sk_buff *)list; | |
1682 | skb = next) { | |
1683 | next = skb->next; | |
1684 | fr = fcoe_dev_from_skb(skb); | |
1685 | if (fr->fr_dev == lp) { | |
1686 | __skb_unlink(skb, list); | |
1687 | kfree_skb(skb); | |
85b4aa49 | 1688 | } |
85b4aa49 | 1689 | } |
5e5e92df | 1690 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
85b4aa49 RL |
1691 | } |
1692 | } | |
1693 | EXPORT_SYMBOL_GPL(fcoe_percpu_clean); | |
1694 | ||
1695 | /** | |
34f42a07 | 1696 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1697 | * @lp: the corresponding fc_lport |
1698 | * | |
1699 | * Returns: none | |
34f42a07 | 1700 | */ |
85b4aa49 RL |
1701 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1702 | { | |
1703 | struct fcoe_softc *fc = lport_priv(lp); | |
1704 | struct sk_buff *skb; | |
1705 | ||
1706 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1707 | while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { | |
1708 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1709 | kfree_skb(skb); | |
1710 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1711 | } | |
1712 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1713 | } | |
1714 | EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue); | |
1715 | ||
34f42a07 RL |
1716 | /** |
1717 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
1718 | * @shost: shost the reset is from |
1719 | * | |
1720 | * Returns: always 0 | |
1721 | */ | |
1722 | int fcoe_reset(struct Scsi_Host *shost) | |
1723 | { | |
1724 | struct fc_lport *lport = shost_priv(shost); | |
1725 | fc_lport_reset(lport); | |
1726 | return 0; | |
1727 | } | |
1728 | EXPORT_SYMBOL_GPL(fcoe_reset); | |
1729 | ||
34f42a07 RL |
1730 | /** |
1731 | * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device | |
85b4aa49 RL |
1732 | * @device: this is currently ptr to net_device |
1733 | * | |
1734 | * Returns: NULL or the located fcoe_softc | |
1735 | */ | |
b2ab99c9 RL |
1736 | static struct fcoe_softc * |
1737 | fcoe_hostlist_lookup_softc(const struct net_device *dev) | |
85b4aa49 RL |
1738 | { |
1739 | struct fcoe_softc *fc; | |
1740 | ||
1741 | read_lock(&fcoe_hostlist_lock); | |
1742 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1743 | if (fc->real_dev == dev) { | |
1744 | read_unlock(&fcoe_hostlist_lock); | |
1745 | return fc; | |
1746 | } | |
1747 | } | |
1748 | read_unlock(&fcoe_hostlist_lock); | |
1749 | return NULL; | |
1750 | } | |
1751 | ||
34f42a07 RL |
1752 | /** |
1753 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
1754 | * @netdev: ptr to net_device |
1755 | * | |
1756 | * Returns: 0 for success | |
1757 | */ | |
1758 | struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) | |
1759 | { | |
1760 | struct fcoe_softc *fc; | |
1761 | ||
1762 | fc = fcoe_hostlist_lookup_softc(netdev); | |
1763 | ||
1764 | return (fc) ? fc->lp : NULL; | |
1765 | } | |
1766 | EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup); | |
1767 | ||
34f42a07 RL |
1768 | /** |
1769 | * fcoe_hostlist_add() - Add a lport to lports list | |
85b4aa49 RL |
1770 | * @lp: ptr to the fc_lport to badded |
1771 | * | |
1772 | * Returns: 0 for success | |
1773 | */ | |
1774 | int fcoe_hostlist_add(const struct fc_lport *lp) | |
1775 | { | |
1776 | struct fcoe_softc *fc; | |
1777 | ||
1778 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1779 | if (!fc) { | |
fc47ff6b | 1780 | fc = lport_priv(lp); |
85b4aa49 RL |
1781 | write_lock_bh(&fcoe_hostlist_lock); |
1782 | list_add_tail(&fc->list, &fcoe_hostlist); | |
1783 | write_unlock_bh(&fcoe_hostlist_lock); | |
1784 | } | |
1785 | return 0; | |
1786 | } | |
1787 | EXPORT_SYMBOL_GPL(fcoe_hostlist_add); | |
1788 | ||
34f42a07 RL |
1789 | /** |
1790 | * fcoe_hostlist_remove() - remove a lport from lports list | |
85b4aa49 RL |
1791 | * @lp: ptr to the fc_lport to badded |
1792 | * | |
1793 | * Returns: 0 for success | |
1794 | */ | |
1795 | int fcoe_hostlist_remove(const struct fc_lport *lp) | |
1796 | { | |
1797 | struct fcoe_softc *fc; | |
1798 | ||
1799 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1800 | BUG_ON(!fc); | |
1801 | write_lock_bh(&fcoe_hostlist_lock); | |
1802 | list_del(&fc->list); | |
1803 | write_unlock_bh(&fcoe_hostlist_lock); | |
1804 | ||
1805 | return 0; | |
1806 | } | |
1807 | EXPORT_SYMBOL_GPL(fcoe_hostlist_remove); | |
1808 | ||
85b4aa49 | 1809 | /** |
34f42a07 | 1810 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 | 1811 | * |
85b4aa49 | 1812 | * Returns 0 on success, negative on failure |
34f42a07 | 1813 | */ |
85b4aa49 RL |
1814 | static int __init fcoe_init(void) |
1815 | { | |
38eccabd | 1816 | unsigned int cpu; |
8976f424 | 1817 | int rc = 0; |
85b4aa49 RL |
1818 | struct fcoe_percpu_s *p; |
1819 | ||
85b4aa49 RL |
1820 | INIT_LIST_HEAD(&fcoe_hostlist); |
1821 | rwlock_init(&fcoe_hostlist_lock); | |
1822 | ||
38eccabd | 1823 | for_each_possible_cpu(cpu) { |
5e5e92df | 1824 | p = &per_cpu(fcoe_percpu, cpu); |
38eccabd RL |
1825 | skb_queue_head_init(&p->fcoe_rx_list); |
1826 | } | |
1827 | ||
8976f424 RL |
1828 | for_each_online_cpu(cpu) |
1829 | fcoe_percpu_thread_create(cpu); | |
85b4aa49 | 1830 | |
8976f424 RL |
1831 | /* Initialize per CPU interrupt thread */ |
1832 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); | |
1833 | if (rc) | |
1834 | goto out_free; | |
85b4aa49 | 1835 | |
8976f424 | 1836 | /* Setup link change notification */ |
85b4aa49 RL |
1837 | fcoe_dev_setup(); |
1838 | ||
a468f328 RL |
1839 | setup_timer(&fcoe_timer, fcoe_watchdog, 0); |
1840 | ||
1841 | mod_timer(&fcoe_timer, jiffies + (10 * HZ)); | |
85b4aa49 | 1842 | |
7f349142 | 1843 | fcoe_if_init(); |
85b4aa49 RL |
1844 | |
1845 | return 0; | |
8976f424 RL |
1846 | |
1847 | out_free: | |
1848 | for_each_online_cpu(cpu) { | |
1849 | fcoe_percpu_thread_destroy(cpu); | |
1850 | } | |
1851 | ||
1852 | return rc; | |
85b4aa49 RL |
1853 | } |
1854 | module_init(fcoe_init); | |
1855 | ||
1856 | /** | |
34f42a07 | 1857 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
1858 | * |
1859 | * Returns 0 on success, negative on failure | |
34f42a07 | 1860 | */ |
85b4aa49 RL |
1861 | static void __exit fcoe_exit(void) |
1862 | { | |
5e5e92df | 1863 | unsigned int cpu; |
85b4aa49 | 1864 | struct fcoe_softc *fc, *tmp; |
85b4aa49 | 1865 | |
85b4aa49 RL |
1866 | fcoe_dev_cleanup(); |
1867 | ||
582b45bc | 1868 | /* Stop the timer */ |
85b4aa49 RL |
1869 | del_timer_sync(&fcoe_timer); |
1870 | ||
5919a595 | 1871 | /* releases the associated fcoe hosts */ |
85b4aa49 | 1872 | list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
7f349142 | 1873 | fcoe_if_destroy(fc->real_dev); |
85b4aa49 | 1874 | |
8976f424 RL |
1875 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
1876 | ||
1877 | for_each_online_cpu(cpu) { | |
1878 | fcoe_percpu_thread_destroy(cpu); | |
85b4aa49 RL |
1879 | } |
1880 | ||
7f349142 VD |
1881 | /* detach from scsi transport */ |
1882 | fcoe_if_exit(); | |
85b4aa49 RL |
1883 | } |
1884 | module_exit(fcoe_exit); |