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85b4aa49 RL |
1 | /* |
2 | * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | * | |
17 | * Maintained at www.Open-FCoE.org | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/version.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/ethtool.h> | |
28 | #include <linux/if_ether.h> | |
29 | #include <linux/if_vlan.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/crc32.h> | |
32 | #include <linux/cpu.h> | |
33 | #include <linux/fs.h> | |
34 | #include <linux/sysfs.h> | |
35 | #include <linux/ctype.h> | |
36 | #include <scsi/scsi_tcq.h> | |
37 | #include <scsi/scsicam.h> | |
38 | #include <scsi/scsi_transport.h> | |
39 | #include <scsi/scsi_transport_fc.h> | |
40 | #include <net/rtnetlink.h> | |
41 | ||
42 | #include <scsi/fc/fc_encaps.h> | |
43 | ||
44 | #include <scsi/libfc.h> | |
45 | #include <scsi/fc_frame.h> | |
46 | #include <scsi/libfcoe.h> | |
85b4aa49 RL |
47 | |
48 | static int debug_fcoe; | |
49 | ||
50 | #define FCOE_MAX_QUEUE_DEPTH 256 | |
c826a314 | 51 | #define FCOE_LOW_QUEUE_DEPTH 32 |
85b4aa49 RL |
52 | |
53 | /* destination address mode */ | |
54 | #define FCOE_GW_ADDR_MODE 0x00 | |
55 | #define FCOE_FCOUI_ADDR_MODE 0x01 | |
56 | ||
57 | #define FCOE_WORD_TO_BYTE 4 | |
58 | ||
7f349142 VD |
59 | #define FCOE_VERSION "0.1" |
60 | #define FCOE_NAME "fcoe" | |
61 | #define FCOE_VENDOR "Open-FCoE.org" | |
62 | ||
63 | #define FCOE_MAX_LUN 255 | |
64 | #define FCOE_MAX_FCP_TARGET 256 | |
65 | ||
66 | #define FCOE_MAX_OUTSTANDING_COMMANDS 1024 | |
67 | ||
68 | #define FCOE_MIN_XID 0x0001 /* the min xid supported by fcoe_sw */ | |
69 | #define FCOE_MAX_XID 0x07ef /* the max xid supported by fcoe_sw */ | |
70 | ||
85b4aa49 RL |
71 | MODULE_AUTHOR("Open-FCoE.org"); |
72 | MODULE_DESCRIPTION("FCoE"); | |
73 | MODULE_LICENSE("GPL"); | |
74 | ||
75 | /* fcoe host list */ | |
76 | LIST_HEAD(fcoe_hostlist); | |
77 | DEFINE_RWLOCK(fcoe_hostlist_lock); | |
78 | DEFINE_TIMER(fcoe_timer, NULL, 0, 0); | |
5e5e92df | 79 | DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
85b4aa49 RL |
80 | |
81 | ||
82 | /* Function Prototyes */ | |
83 | static int fcoe_check_wait_queue(struct fc_lport *); | |
85b4aa49 | 84 | static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *); |
85b4aa49 RL |
85 | static int fcoe_device_notification(struct notifier_block *, ulong, void *); |
86 | static void fcoe_dev_setup(void); | |
87 | static void fcoe_dev_cleanup(void); | |
88 | ||
89 | /* notification function from net device */ | |
90 | static struct notifier_block fcoe_notifier = { | |
91 | .notifier_call = fcoe_device_notification, | |
92 | }; | |
93 | ||
7f349142 VD |
94 | static struct scsi_transport_template *scsi_transport_fcoe_sw; |
95 | ||
96 | struct fc_function_template fcoe_transport_function = { | |
97 | .show_host_node_name = 1, | |
98 | .show_host_port_name = 1, | |
99 | .show_host_supported_classes = 1, | |
100 | .show_host_supported_fc4s = 1, | |
101 | .show_host_active_fc4s = 1, | |
102 | .show_host_maxframe_size = 1, | |
103 | ||
104 | .show_host_port_id = 1, | |
105 | .show_host_supported_speeds = 1, | |
106 | .get_host_speed = fc_get_host_speed, | |
107 | .show_host_speed = 1, | |
108 | .show_host_port_type = 1, | |
109 | .get_host_port_state = fc_get_host_port_state, | |
110 | .show_host_port_state = 1, | |
111 | .show_host_symbolic_name = 1, | |
112 | ||
113 | .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), | |
114 | .show_rport_maxframe_size = 1, | |
115 | .show_rport_supported_classes = 1, | |
116 | ||
117 | .show_host_fabric_name = 1, | |
118 | .show_starget_node_name = 1, | |
119 | .show_starget_port_name = 1, | |
120 | .show_starget_port_id = 1, | |
121 | .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, | |
122 | .show_rport_dev_loss_tmo = 1, | |
123 | .get_fc_host_stats = fc_get_host_stats, | |
124 | .issue_fc_host_lip = fcoe_reset, | |
125 | ||
126 | .terminate_rport_io = fc_rport_terminate_io, | |
127 | }; | |
128 | ||
129 | static struct scsi_host_template fcoe_shost_template = { | |
130 | .module = THIS_MODULE, | |
131 | .name = "FCoE Driver", | |
132 | .proc_name = FCOE_NAME, | |
133 | .queuecommand = fc_queuecommand, | |
134 | .eh_abort_handler = fc_eh_abort, | |
135 | .eh_device_reset_handler = fc_eh_device_reset, | |
136 | .eh_host_reset_handler = fc_eh_host_reset, | |
137 | .slave_alloc = fc_slave_alloc, | |
138 | .change_queue_depth = fc_change_queue_depth, | |
139 | .change_queue_type = fc_change_queue_type, | |
140 | .this_id = -1, | |
141 | .cmd_per_lun = 32, | |
142 | .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, | |
143 | .use_clustering = ENABLE_CLUSTERING, | |
144 | .sg_tablesize = SG_ALL, | |
145 | .max_sectors = 0xffff, | |
146 | }; | |
147 | ||
148 | /** | |
149 | * fcoe_lport_config() - sets up the fc_lport | |
150 | * @lp: ptr to the fc_lport | |
151 | * @shost: ptr to the parent scsi host | |
152 | * | |
153 | * Returns: 0 for success | |
154 | */ | |
155 | static int fcoe_lport_config(struct fc_lport *lp) | |
156 | { | |
157 | lp->link_up = 0; | |
158 | lp->qfull = 0; | |
159 | lp->max_retry_count = 3; | |
160 | lp->e_d_tov = 2 * 1000; /* FC-FS default */ | |
161 | lp->r_a_tov = 2 * 2 * 1000; | |
162 | lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | | |
163 | FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); | |
164 | ||
165 | fc_lport_init_stats(lp); | |
166 | ||
167 | /* lport fc_lport related configuration */ | |
168 | fc_lport_config(lp); | |
169 | ||
170 | /* offload related configuration */ | |
171 | lp->crc_offload = 0; | |
172 | lp->seq_offload = 0; | |
173 | lp->lro_enabled = 0; | |
174 | lp->lro_xid = 0; | |
175 | lp->lso_max = 0; | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /** | |
181 | * fcoe_netdev_config() - Set up netdev for SW FCoE | |
182 | * @lp : ptr to the fc_lport | |
183 | * @netdev : ptr to the associated netdevice struct | |
184 | * | |
185 | * Must be called after fcoe_lport_config() as it will use lport mutex | |
186 | * | |
187 | * Returns : 0 for success | |
188 | */ | |
189 | static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) | |
190 | { | |
191 | u32 mfs; | |
192 | u64 wwnn, wwpn; | |
193 | struct fcoe_softc *fc; | |
194 | u8 flogi_maddr[ETH_ALEN]; | |
195 | ||
196 | /* Setup lport private data to point to fcoe softc */ | |
197 | fc = lport_priv(lp); | |
198 | fc->lp = lp; | |
199 | fc->real_dev = netdev; | |
200 | fc->phys_dev = netdev; | |
201 | ||
202 | /* Require support for get_pauseparam ethtool op. */ | |
203 | if (netdev->priv_flags & IFF_802_1Q_VLAN) | |
204 | fc->phys_dev = vlan_dev_real_dev(netdev); | |
205 | ||
206 | /* Do not support for bonding device */ | |
207 | if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) || | |
208 | (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) || | |
209 | (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) { | |
210 | return -EOPNOTSUPP; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Determine max frame size based on underlying device and optional | |
215 | * user-configured limit. If the MFS is too low, fcoe_link_ok() | |
216 | * will return 0, so do this first. | |
217 | */ | |
218 | mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) + | |
219 | sizeof(struct fcoe_crc_eof)); | |
220 | if (fc_set_mfs(lp, mfs)) | |
221 | return -EINVAL; | |
222 | ||
223 | if (!fcoe_link_ok(lp)) | |
224 | lp->link_up = 1; | |
225 | ||
226 | /* offload features support */ | |
227 | if (fc->real_dev->features & NETIF_F_SG) | |
228 | lp->sg_supp = 1; | |
229 | ||
230 | #ifdef NETIF_F_FCOE_CRC | |
231 | if (netdev->features & NETIF_F_FCOE_CRC) { | |
232 | lp->crc_offload = 1; | |
233 | printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n", | |
234 | netdev->name); | |
235 | } | |
236 | #endif | |
237 | #ifdef NETIF_F_FSO | |
238 | if (netdev->features & NETIF_F_FSO) { | |
239 | lp->seq_offload = 1; | |
240 | lp->lso_max = netdev->gso_max_size; | |
241 | printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n", | |
242 | netdev->name, lp->lso_max); | |
243 | } | |
244 | #endif | |
245 | if (netdev->fcoe_ddp_xid) { | |
246 | lp->lro_enabled = 1; | |
247 | lp->lro_xid = netdev->fcoe_ddp_xid; | |
248 | printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n", | |
249 | netdev->name, lp->lro_xid); | |
250 | } | |
251 | skb_queue_head_init(&fc->fcoe_pending_queue); | |
252 | fc->fcoe_pending_queue_active = 0; | |
253 | ||
254 | /* setup Source Mac Address */ | |
255 | memcpy(fc->ctl_src_addr, fc->real_dev->dev_addr, | |
256 | fc->real_dev->addr_len); | |
257 | ||
258 | wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0); | |
259 | fc_set_wwnn(lp, wwnn); | |
260 | /* XXX - 3rd arg needs to be vlan id */ | |
261 | wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0); | |
262 | fc_set_wwpn(lp, wwpn); | |
263 | ||
264 | /* | |
265 | * Add FCoE MAC address as second unicast MAC address | |
266 | * or enter promiscuous mode if not capable of listening | |
267 | * for multiple unicast MACs. | |
268 | */ | |
269 | rtnl_lock(); | |
270 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
271 | dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN); | |
272 | rtnl_unlock(); | |
273 | ||
274 | /* | |
275 | * setup the receive function from ethernet driver | |
276 | * on the ethertype for the given device | |
277 | */ | |
278 | fc->fcoe_packet_type.func = fcoe_rcv; | |
279 | fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); | |
280 | fc->fcoe_packet_type.dev = fc->real_dev; | |
281 | dev_add_pack(&fc->fcoe_packet_type); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | /** | |
287 | * fcoe_shost_config() - Sets up fc_lport->host | |
288 | * @lp : ptr to the fc_lport | |
289 | * @shost : ptr to the associated scsi host | |
290 | * @dev : device associated to scsi host | |
291 | * | |
292 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() | |
293 | * | |
294 | * Returns : 0 for success | |
295 | */ | |
296 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, | |
297 | struct device *dev) | |
298 | { | |
299 | int rc = 0; | |
300 | ||
301 | /* lport scsi host config */ | |
302 | lp->host = shost; | |
303 | ||
304 | lp->host->max_lun = FCOE_MAX_LUN; | |
305 | lp->host->max_id = FCOE_MAX_FCP_TARGET; | |
306 | lp->host->max_channel = 0; | |
307 | lp->host->transportt = scsi_transport_fcoe_sw; | |
308 | ||
309 | /* add the new host to the SCSI-ml */ | |
310 | rc = scsi_add_host(lp->host, dev); | |
311 | if (rc) { | |
312 | FC_DBG("fcoe_shost_config:error on scsi_add_host\n"); | |
313 | return rc; | |
314 | } | |
315 | sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", | |
316 | FCOE_NAME, FCOE_VERSION, | |
317 | fcoe_netdev(lp)->name); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | /** | |
323 | * fcoe_em_config() - allocates em for this lport | |
324 | * @lp: the port that em is to allocated for | |
325 | * | |
326 | * Returns : 0 on success | |
327 | */ | |
328 | static inline int fcoe_em_config(struct fc_lport *lp) | |
329 | { | |
330 | BUG_ON(lp->emp); | |
331 | ||
332 | lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3, | |
333 | FCOE_MIN_XID, FCOE_MAX_XID); | |
334 | if (!lp->emp) | |
335 | return -ENOMEM; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | /** | |
341 | * fcoe_if_destroy() - FCoE software HBA tear-down function | |
342 | * @netdev: ptr to the associated net_device | |
343 | * | |
344 | * Returns: 0 if link is OK for use by FCoE. | |
345 | */ | |
346 | static int fcoe_if_destroy(struct net_device *netdev) | |
347 | { | |
348 | struct fc_lport *lp = NULL; | |
349 | struct fcoe_softc *fc; | |
350 | u8 flogi_maddr[ETH_ALEN]; | |
351 | ||
352 | BUG_ON(!netdev); | |
353 | ||
354 | printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n", | |
355 | netdev->name); | |
356 | ||
357 | lp = fcoe_hostlist_lookup(netdev); | |
358 | if (!lp) | |
359 | return -ENODEV; | |
360 | ||
361 | fc = lport_priv(lp); | |
362 | ||
363 | /* Logout of the fabric */ | |
364 | fc_fabric_logoff(lp); | |
365 | ||
366 | /* Remove the instance from fcoe's list */ | |
367 | fcoe_hostlist_remove(lp); | |
368 | ||
369 | /* Don't listen for Ethernet packets anymore */ | |
370 | dev_remove_pack(&fc->fcoe_packet_type); | |
371 | ||
372 | /* Cleanup the fc_lport */ | |
373 | fc_lport_destroy(lp); | |
374 | fc_fcp_destroy(lp); | |
375 | ||
376 | /* Detach from the scsi-ml */ | |
377 | fc_remove_host(lp->host); | |
378 | scsi_remove_host(lp->host); | |
379 | ||
380 | /* There are no more rports or I/O, free the EM */ | |
381 | if (lp->emp) | |
382 | fc_exch_mgr_free(lp->emp); | |
383 | ||
384 | /* Delete secondary MAC addresses */ | |
385 | rtnl_lock(); | |
386 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
387 | dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN); | |
388 | if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 })) | |
389 | dev_unicast_delete(fc->real_dev, fc->data_src_addr, ETH_ALEN); | |
390 | rtnl_unlock(); | |
391 | ||
392 | /* Free the per-CPU revieve threads */ | |
393 | fcoe_percpu_clean(lp); | |
394 | ||
395 | /* Free existing skbs */ | |
396 | fcoe_clean_pending_queue(lp); | |
397 | ||
398 | /* Free memory used by statistical counters */ | |
399 | fc_lport_free_stats(lp); | |
400 | ||
401 | /* Release the net_device and Scsi_Host */ | |
402 | dev_put(fc->real_dev); | |
403 | scsi_host_put(lp->host); | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | /* | |
409 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device | |
410 | * @lp: the corresponding fc_lport | |
411 | * @xid: the exchange id for this ddp transfer | |
412 | * @sgl: the scatterlist describing this transfer | |
413 | * @sgc: number of sg items | |
414 | * | |
415 | * Returns : 0 no ddp | |
416 | */ | |
417 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, | |
418 | struct scatterlist *sgl, unsigned int sgc) | |
419 | { | |
420 | struct net_device *n = fcoe_netdev(lp); | |
421 | ||
422 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup) | |
423 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | /* | |
429 | * fcoe_ddp_done - calls LLD's ddp_done through net_device | |
430 | * @lp: the corresponding fc_lport | |
431 | * @xid: the exchange id for this ddp transfer | |
432 | * | |
433 | * Returns : the length of data that have been completed by ddp | |
434 | */ | |
435 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) | |
436 | { | |
437 | struct net_device *n = fcoe_netdev(lp); | |
438 | ||
439 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done) | |
440 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static struct libfc_function_template fcoe_libfc_fcn_templ = { | |
445 | .frame_send = fcoe_xmit, | |
446 | .ddp_setup = fcoe_ddp_setup, | |
447 | .ddp_done = fcoe_ddp_done, | |
448 | }; | |
449 | ||
450 | /** | |
451 | * fcoe_if_create() - this function creates the fcoe interface | |
452 | * @netdev: pointer the associated netdevice | |
453 | * | |
454 | * Creates fc_lport struct and scsi_host for lport, configures lport | |
455 | * and starts fabric login. | |
456 | * | |
457 | * Returns : 0 on success | |
458 | */ | |
459 | static int fcoe_if_create(struct net_device *netdev) | |
460 | { | |
461 | int rc; | |
462 | struct fc_lport *lp = NULL; | |
463 | struct fcoe_softc *fc; | |
464 | struct Scsi_Host *shost; | |
465 | ||
466 | BUG_ON(!netdev); | |
467 | ||
468 | printk(KERN_DEBUG "fcoe_if_create:interface on %s\n", | |
469 | netdev->name); | |
470 | ||
471 | lp = fcoe_hostlist_lookup(netdev); | |
472 | if (lp) | |
473 | return -EEXIST; | |
474 | ||
475 | shost = fcoe_host_alloc(&fcoe_shost_template, | |
476 | sizeof(struct fcoe_softc)); | |
477 | if (!shost) { | |
478 | FC_DBG("Could not allocate host structure\n"); | |
479 | return -ENOMEM; | |
480 | } | |
481 | lp = shost_priv(shost); | |
482 | fc = lport_priv(lp); | |
483 | ||
484 | /* configure fc_lport, e.g., em */ | |
485 | rc = fcoe_lport_config(lp); | |
486 | if (rc) { | |
487 | FC_DBG("Could not configure lport\n"); | |
488 | goto out_host_put; | |
489 | } | |
490 | ||
491 | /* configure lport network properties */ | |
492 | rc = fcoe_netdev_config(lp, netdev); | |
493 | if (rc) { | |
494 | FC_DBG("Could not configure netdev for lport\n"); | |
495 | goto out_host_put; | |
496 | } | |
497 | ||
498 | /* configure lport scsi host properties */ | |
499 | rc = fcoe_shost_config(lp, shost, &netdev->dev); | |
500 | if (rc) { | |
501 | FC_DBG("Could not configure shost for lport\n"); | |
502 | goto out_host_put; | |
503 | } | |
504 | ||
505 | /* lport exch manager allocation */ | |
506 | rc = fcoe_em_config(lp); | |
507 | if (rc) { | |
508 | FC_DBG("Could not configure em for lport\n"); | |
509 | goto out_host_put; | |
510 | } | |
511 | ||
512 | /* Initialize the library */ | |
513 | rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ); | |
514 | if (rc) { | |
515 | FC_DBG("Could not configure libfc for lport!\n"); | |
516 | goto out_lp_destroy; | |
517 | } | |
518 | ||
519 | /* add to lports list */ | |
520 | fcoe_hostlist_add(lp); | |
521 | ||
522 | lp->boot_time = jiffies; | |
523 | ||
524 | fc_fabric_login(lp); | |
525 | ||
526 | dev_hold(netdev); | |
527 | ||
528 | return rc; | |
529 | ||
530 | out_lp_destroy: | |
531 | fc_exch_mgr_free(lp->emp); /* Free the EM */ | |
532 | out_host_put: | |
533 | scsi_host_put(lp->host); | |
534 | return rc; | |
535 | } | |
536 | ||
537 | /** | |
538 | * fcoe_if_init() - attach to scsi transport | |
539 | * | |
540 | * Returns : 0 on success | |
541 | */ | |
542 | static int __init fcoe_if_init(void) | |
543 | { | |
544 | /* attach to scsi transport */ | |
545 | scsi_transport_fcoe_sw = | |
546 | fc_attach_transport(&fcoe_transport_function); | |
547 | ||
548 | if (!scsi_transport_fcoe_sw) { | |
549 | printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n"); | |
550 | return -ENODEV; | |
551 | } | |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
556 | /** | |
557 | * fcoe_if_exit() - detach from scsi transport | |
558 | * | |
559 | * Returns : 0 on success | |
560 | */ | |
561 | int __exit fcoe_if_exit(void) | |
562 | { | |
563 | fc_release_transport(scsi_transport_fcoe_sw); | |
564 | return 0; | |
565 | } | |
566 | ||
8976f424 RL |
567 | /** |
568 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu | |
569 | * @cpu: cpu index for the online cpu | |
570 | */ | |
571 | static void fcoe_percpu_thread_create(unsigned int cpu) | |
572 | { | |
573 | struct fcoe_percpu_s *p; | |
574 | struct task_struct *thread; | |
575 | ||
576 | p = &per_cpu(fcoe_percpu, cpu); | |
577 | ||
578 | thread = kthread_create(fcoe_percpu_receive_thread, | |
579 | (void *)p, "fcoethread/%d", cpu); | |
580 | ||
581 | if (likely(!IS_ERR(p->thread))) { | |
582 | kthread_bind(thread, cpu); | |
583 | wake_up_process(thread); | |
584 | ||
585 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
586 | p->thread = thread; | |
587 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
588 | } | |
589 | } | |
590 | ||
591 | /** | |
592 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu | |
593 | * @cpu: cpu index the rx thread is to be removed | |
594 | * | |
595 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the | |
596 | * current CPU's Rx thread. If the thread being destroyed is bound to | |
597 | * the CPU processing this context the skbs will be freed. | |
598 | */ | |
599 | static void fcoe_percpu_thread_destroy(unsigned int cpu) | |
600 | { | |
601 | struct fcoe_percpu_s *p; | |
602 | struct task_struct *thread; | |
603 | struct page *crc_eof; | |
604 | struct sk_buff *skb; | |
605 | #ifdef CONFIG_SMP | |
606 | struct fcoe_percpu_s *p0; | |
607 | unsigned targ_cpu = smp_processor_id(); | |
608 | #endif /* CONFIG_SMP */ | |
609 | ||
610 | printk(KERN_DEBUG "fcoe: Destroying receive thread for CPU %d\n", cpu); | |
611 | ||
612 | /* Prevent any new skbs from being queued for this CPU. */ | |
613 | p = &per_cpu(fcoe_percpu, cpu); | |
614 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
615 | thread = p->thread; | |
616 | p->thread = NULL; | |
617 | crc_eof = p->crc_eof_page; | |
618 | p->crc_eof_page = NULL; | |
619 | p->crc_eof_offset = 0; | |
620 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
621 | ||
622 | #ifdef CONFIG_SMP | |
623 | /* | |
624 | * Don't bother moving the skb's if this context is running | |
625 | * on the same CPU that is having its thread destroyed. This | |
626 | * can easily happen when the module is removed. | |
627 | */ | |
628 | if (cpu != targ_cpu) { | |
629 | p0 = &per_cpu(fcoe_percpu, targ_cpu); | |
630 | spin_lock_bh(&p0->fcoe_rx_list.lock); | |
631 | if (p0->thread) { | |
632 | FC_DBG("Moving frames from CPU %d to CPU %d\n", | |
633 | cpu, targ_cpu); | |
634 | ||
635 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
636 | __skb_queue_tail(&p0->fcoe_rx_list, skb); | |
637 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
638 | } else { | |
639 | /* | |
640 | * The targeted CPU is not initialized and cannot accept | |
641 | * new skbs. Unlock the targeted CPU and drop the skbs | |
642 | * on the CPU that is going offline. | |
643 | */ | |
644 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
645 | kfree_skb(skb); | |
646 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
647 | } | |
648 | } else { | |
649 | /* | |
650 | * This scenario occurs when the module is being removed | |
651 | * and all threads are being destroyed. skbs will continue | |
652 | * to be shifted from the CPU thread that is being removed | |
653 | * to the CPU thread associated with the CPU that is processing | |
654 | * the module removal. Once there is only one CPU Rx thread it | |
655 | * will reach this case and we will drop all skbs and later | |
656 | * 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 | } | |
663 | #else | |
664 | /* | |
665 | * This a non-SMP scenario where the singluar Rx thread is | |
666 | * being removed. Free all skbs and stop the thread. | |
667 | */ | |
668 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
669 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
670 | kfree_skb(skb); | |
671 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
672 | #endif | |
673 | ||
674 | if (thread) | |
675 | kthread_stop(thread); | |
676 | ||
677 | if (crc_eof) | |
678 | put_page(crc_eof); | |
679 | } | |
680 | ||
681 | /** | |
682 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback | |
683 | * @nfb: callback data block | |
684 | * @action: event triggering the callback | |
685 | * @hcpu: index for the cpu of this event | |
686 | * | |
687 | * This creates or destroys per cpu data for fcoe | |
688 | * | |
689 | * Returns NOTIFY_OK always. | |
690 | */ | |
691 | static int fcoe_cpu_callback(struct notifier_block *nfb, | |
692 | unsigned long action, void *hcpu) | |
693 | { | |
694 | unsigned cpu = (unsigned long)hcpu; | |
695 | ||
696 | switch (action) { | |
697 | case CPU_ONLINE: | |
698 | case CPU_ONLINE_FROZEN: | |
699 | FC_DBG("CPU %x online: Create Rx thread\n", cpu); | |
700 | fcoe_percpu_thread_create(cpu); | |
701 | break; | |
702 | case CPU_DEAD: | |
703 | case CPU_DEAD_FROZEN: | |
704 | FC_DBG("CPU %x offline: Remove Rx thread\n", cpu); | |
705 | fcoe_percpu_thread_destroy(cpu); | |
706 | break; | |
707 | default: | |
708 | break; | |
709 | } | |
710 | return NOTIFY_OK; | |
711 | } | |
712 | ||
713 | static struct notifier_block fcoe_cpu_notifier = { | |
714 | .notifier_call = fcoe_cpu_callback, | |
715 | }; | |
716 | ||
85b4aa49 | 717 | /** |
34f42a07 | 718 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
719 | * @skb: the receive skb |
720 | * @dev: associated net device | |
721 | * @ptype: context | |
722 | * @odldev: last device | |
723 | * | |
724 | * this function will receive the packet and build fc frame and pass it up | |
725 | * | |
726 | * Returns: 0 for success | |
34f42a07 | 727 | */ |
85b4aa49 RL |
728 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
729 | struct packet_type *ptype, struct net_device *olddev) | |
730 | { | |
731 | struct fc_lport *lp; | |
732 | struct fcoe_rcv_info *fr; | |
733 | struct fcoe_softc *fc; | |
85b4aa49 | 734 | struct fc_frame_header *fh; |
85b4aa49 | 735 | struct fcoe_percpu_s *fps; |
38eccabd | 736 | unsigned short oxid; |
8976f424 | 737 | unsigned int cpu = 0; |
85b4aa49 RL |
738 | |
739 | fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); | |
740 | lp = fc->lp; | |
741 | if (unlikely(lp == NULL)) { | |
742 | FC_DBG("cannot find hba structure"); | |
743 | goto err2; | |
744 | } | |
745 | ||
746 | if (unlikely(debug_fcoe)) { | |
747 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p " | |
748 | "end:%p sum:%d dev:%s", skb->len, skb->data_len, | |
749 | skb->head, skb->data, skb_tail_pointer(skb), | |
750 | skb_end_pointer(skb), skb->csum, | |
751 | skb->dev ? skb->dev->name : "<NULL>"); | |
752 | ||
753 | } | |
754 | ||
755 | /* check for FCOE packet type */ | |
756 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
757 | FC_DBG("wrong FC type frame"); | |
758 | goto err; | |
759 | } | |
760 | ||
761 | /* | |
762 | * Check for minimum frame length, and make sure required FCoE | |
763 | * and FC headers are pulled into the linear data area. | |
764 | */ | |
765 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
766 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
767 | goto err; | |
768 | ||
769 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
770 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
771 | ||
772 | oxid = ntohs(fh->fh_ox_id); | |
773 | ||
774 | fr = fcoe_dev_from_skb(skb); | |
775 | fr->fr_dev = lp; | |
776 | fr->ptype = ptype; | |
5e5e92df | 777 | |
85b4aa49 RL |
778 | #ifdef CONFIG_SMP |
779 | /* | |
780 | * The incoming frame exchange id(oxid) is ANDed with num of online | |
8976f424 RL |
781 | * cpu bits to get cpu and then this cpu is used for selecting |
782 | * a per cpu kernel thread from fcoe_percpu. | |
85b4aa49 | 783 | */ |
8976f424 | 784 | cpu = oxid & (num_online_cpus() - 1); |
85b4aa49 | 785 | #endif |
5e5e92df | 786 | |
8976f424 | 787 | fps = &per_cpu(fcoe_percpu, cpu); |
85b4aa49 | 788 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
8976f424 RL |
789 | if (unlikely(!fps->thread)) { |
790 | /* | |
791 | * The targeted CPU is not ready, let's target | |
792 | * the first CPU now. For non-SMP systems this | |
793 | * will check the same CPU twice. | |
794 | */ | |
795 | FC_DBG("CPU is online, but no receive thread ready " | |
796 | "for incoming skb- using first online CPU.\n"); | |
797 | ||
798 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
799 | cpu = first_cpu(cpu_online_map); | |
800 | fps = &per_cpu(fcoe_percpu, cpu); | |
801 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
802 | if (!fps->thread) { | |
803 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
804 | goto err; | |
805 | } | |
806 | } | |
807 | ||
808 | /* | |
809 | * We now have a valid CPU that we're targeting for | |
810 | * this skb. We also have this receive thread locked, | |
811 | * so we're free to queue skbs into it's queue. | |
812 | */ | |
85b4aa49 RL |
813 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
814 | if (fps->fcoe_rx_list.qlen == 1) | |
815 | wake_up_process(fps->thread); | |
816 | ||
817 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
818 | ||
819 | return 0; | |
820 | err: | |
582b45bc | 821 | fc_lport_get_stats(lp)->ErrorFrames++; |
85b4aa49 RL |
822 | |
823 | err2: | |
824 | kfree_skb(skb); | |
825 | return -1; | |
826 | } | |
827 | EXPORT_SYMBOL_GPL(fcoe_rcv); | |
828 | ||
829 | /** | |
34f42a07 | 830 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
831 | * @skb: the skb to be xmitted |
832 | * | |
833 | * Returns: 0 for success | |
34f42a07 | 834 | */ |
85b4aa49 RL |
835 | static inline int fcoe_start_io(struct sk_buff *skb) |
836 | { | |
837 | int rc; | |
838 | ||
839 | skb_get(skb); | |
840 | rc = dev_queue_xmit(skb); | |
841 | if (rc != 0) | |
842 | return rc; | |
843 | kfree_skb(skb); | |
844 | return 0; | |
845 | } | |
846 | ||
847 | /** | |
34f42a07 | 848 | * fcoe_get_paged_crc_eof() - in case we need alloc a page for crc_eof |
85b4aa49 RL |
849 | * @skb: the skb to be xmitted |
850 | * @tlen: total len | |
851 | * | |
852 | * Returns: 0 for success | |
34f42a07 | 853 | */ |
85b4aa49 RL |
854 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
855 | { | |
856 | struct fcoe_percpu_s *fps; | |
857 | struct page *page; | |
85b4aa49 | 858 | |
5e5e92df | 859 | fps = &get_cpu_var(fcoe_percpu); |
85b4aa49 RL |
860 | page = fps->crc_eof_page; |
861 | if (!page) { | |
862 | page = alloc_page(GFP_ATOMIC); | |
863 | if (!page) { | |
5e5e92df | 864 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
865 | return -ENOMEM; |
866 | } | |
867 | fps->crc_eof_page = page; | |
8976f424 | 868 | fps->crc_eof_offset = 0; |
85b4aa49 RL |
869 | } |
870 | ||
871 | get_page(page); | |
872 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
873 | fps->crc_eof_offset, tlen); | |
874 | skb->len += tlen; | |
875 | skb->data_len += tlen; | |
876 | skb->truesize += tlen; | |
877 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
878 | ||
879 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
880 | fps->crc_eof_page = NULL; | |
881 | fps->crc_eof_offset = 0; | |
882 | put_page(page); | |
883 | } | |
5e5e92df | 884 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
885 | return 0; |
886 | } | |
887 | ||
888 | /** | |
34f42a07 | 889 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
85b4aa49 RL |
890 | * @fp: the fc_frame containg data to be checksummed |
891 | * | |
892 | * This uses crc32() to calculate the crc for fc frame | |
893 | * Return : 32 bit crc | |
34f42a07 | 894 | */ |
85b4aa49 RL |
895 | u32 fcoe_fc_crc(struct fc_frame *fp) |
896 | { | |
897 | struct sk_buff *skb = fp_skb(fp); | |
898 | struct skb_frag_struct *frag; | |
899 | unsigned char *data; | |
900 | unsigned long off, len, clen; | |
901 | u32 crc; | |
902 | unsigned i; | |
903 | ||
904 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
905 | ||
906 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
907 | frag = &skb_shinfo(skb)->frags[i]; | |
908 | off = frag->page_offset; | |
909 | len = frag->size; | |
910 | while (len > 0) { | |
911 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
912 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
913 | KM_SKB_DATA_SOFTIRQ); | |
914 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
915 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
916 | off += clen; | |
917 | len -= clen; | |
918 | } | |
919 | } | |
920 | return crc; | |
921 | } | |
922 | EXPORT_SYMBOL_GPL(fcoe_fc_crc); | |
923 | ||
924 | /** | |
34f42a07 | 925 | * fcoe_xmit() - FCoE frame transmit function |
85b4aa49 RL |
926 | * @lp: the associated local port |
927 | * @fp: the fc_frame to be transmitted | |
928 | * | |
929 | * Return : 0 for success | |
34f42a07 | 930 | */ |
85b4aa49 RL |
931 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
932 | { | |
933 | int wlen, rc = 0; | |
934 | u32 crc; | |
935 | struct ethhdr *eh; | |
936 | struct fcoe_crc_eof *cp; | |
937 | struct sk_buff *skb; | |
938 | struct fcoe_dev_stats *stats; | |
939 | struct fc_frame_header *fh; | |
940 | unsigned int hlen; /* header length implies the version */ | |
941 | unsigned int tlen; /* trailer length */ | |
942 | unsigned int elen; /* eth header, may include vlan */ | |
943 | int flogi_in_progress = 0; | |
944 | struct fcoe_softc *fc; | |
945 | u8 sof, eof; | |
946 | struct fcoe_hdr *hp; | |
947 | ||
948 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
949 | ||
fc47ff6b | 950 | fc = lport_priv(lp); |
85b4aa49 RL |
951 | /* |
952 | * if it is a flogi then we need to learn gw-addr | |
953 | * and my own fcid | |
954 | */ | |
955 | fh = fc_frame_header_get(fp); | |
956 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) { | |
957 | if (fc_frame_payload_op(fp) == ELS_FLOGI) { | |
958 | fc->flogi_oxid = ntohs(fh->fh_ox_id); | |
959 | fc->address_mode = FCOE_FCOUI_ADDR_MODE; | |
960 | fc->flogi_progress = 1; | |
961 | flogi_in_progress = 1; | |
962 | } else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) { | |
963 | /* | |
964 | * Here we must've gotten an SID by accepting an FLOGI | |
965 | * from a point-to-point connection. Switch to using | |
966 | * the source mac based on the SID. The destination | |
967 | * MAC in this case would have been set by receving the | |
968 | * FLOGI. | |
969 | */ | |
970 | fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id); | |
971 | fc->flogi_progress = 0; | |
972 | } | |
973 | } | |
974 | ||
975 | skb = fp_skb(fp); | |
976 | sof = fr_sof(fp); | |
977 | eof = fr_eof(fp); | |
978 | ||
979 | elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ? | |
980 | sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr); | |
981 | hlen = sizeof(struct fcoe_hdr); | |
982 | tlen = sizeof(struct fcoe_crc_eof); | |
983 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
984 | ||
985 | /* crc offload */ | |
986 | if (likely(lp->crc_offload)) { | |
39ca9a06 | 987 | skb->ip_summed = CHECKSUM_PARTIAL; |
85b4aa49 RL |
988 | skb->csum_start = skb_headroom(skb); |
989 | skb->csum_offset = skb->len; | |
990 | crc = 0; | |
991 | } else { | |
992 | skb->ip_summed = CHECKSUM_NONE; | |
993 | crc = fcoe_fc_crc(fp); | |
994 | } | |
995 | ||
996 | /* copy fc crc and eof to the skb buff */ | |
997 | if (skb_is_nonlinear(skb)) { | |
998 | skb_frag_t *frag; | |
999 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 1000 | kfree_skb(skb); |
85b4aa49 RL |
1001 | return -ENOMEM; |
1002 | } | |
1003 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
1004 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
1005 | + frag->page_offset; | |
1006 | } else { | |
1007 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
1008 | } | |
1009 | ||
1010 | memset(cp, 0, sizeof(*cp)); | |
1011 | cp->fcoe_eof = eof; | |
1012 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
1013 | ||
1014 | if (skb_is_nonlinear(skb)) { | |
1015 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
1016 | cp = NULL; | |
1017 | } | |
1018 | ||
1019 | /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */ | |
1020 | skb_push(skb, elen + hlen); | |
1021 | skb_reset_mac_header(skb); | |
1022 | skb_reset_network_header(skb); | |
1023 | skb->mac_len = elen; | |
211c738d | 1024 | skb->protocol = htons(ETH_P_FCOE); |
85b4aa49 RL |
1025 | skb->dev = fc->real_dev; |
1026 | ||
1027 | /* fill up mac and fcoe headers */ | |
1028 | eh = eth_hdr(skb); | |
1029 | eh->h_proto = htons(ETH_P_FCOE); | |
1030 | if (fc->address_mode == FCOE_FCOUI_ADDR_MODE) | |
1031 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); | |
1032 | else | |
1033 | /* insert GW address */ | |
1034 | memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN); | |
1035 | ||
1036 | if (unlikely(flogi_in_progress)) | |
1037 | memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN); | |
1038 | else | |
1039 | memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN); | |
1040 | ||
1041 | hp = (struct fcoe_hdr *)(eh + 1); | |
1042 | memset(hp, 0, sizeof(*hp)); | |
1043 | if (FC_FCOE_VER) | |
1044 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
1045 | hp->fcoe_sof = sof; | |
1046 | ||
39ca9a06 YZ |
1047 | #ifdef NETIF_F_FSO |
1048 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ | |
1049 | if (lp->seq_offload && fr_max_payload(fp)) { | |
1050 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; | |
1051 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); | |
1052 | } else { | |
1053 | skb_shinfo(skb)->gso_type = 0; | |
1054 | skb_shinfo(skb)->gso_size = 0; | |
1055 | } | |
1056 | #endif | |
85b4aa49 | 1057 | /* update tx stats: regardless if LLD fails */ |
582b45bc RL |
1058 | stats = fc_lport_get_stats(lp); |
1059 | stats->TxFrames++; | |
1060 | stats->TxWords += wlen; | |
85b4aa49 RL |
1061 | |
1062 | /* send down to lld */ | |
1063 | fr_dev(fp) = lp; | |
1064 | if (fc->fcoe_pending_queue.qlen) | |
1065 | rc = fcoe_check_wait_queue(lp); | |
1066 | ||
1067 | if (rc == 0) | |
1068 | rc = fcoe_start_io(skb); | |
1069 | ||
1070 | if (rc) { | |
55c8bafb CL |
1071 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
1072 | __skb_queue_tail(&fc->fcoe_pending_queue, skb); | |
1073 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
85b4aa49 | 1074 | if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
bc0e17f6 | 1075 | lp->qfull = 1; |
85b4aa49 RL |
1076 | } |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | EXPORT_SYMBOL_GPL(fcoe_xmit); | |
1081 | ||
34f42a07 RL |
1082 | /** |
1083 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
1084 | * @arg: ptr to the fcoe per cpu struct |
1085 | * | |
1086 | * Return: 0 for success | |
85b4aa49 RL |
1087 | */ |
1088 | int fcoe_percpu_receive_thread(void *arg) | |
1089 | { | |
1090 | struct fcoe_percpu_s *p = arg; | |
1091 | u32 fr_len; | |
1092 | struct fc_lport *lp; | |
1093 | struct fcoe_rcv_info *fr; | |
1094 | struct fcoe_dev_stats *stats; | |
1095 | struct fc_frame_header *fh; | |
1096 | struct sk_buff *skb; | |
1097 | struct fcoe_crc_eof crc_eof; | |
1098 | struct fc_frame *fp; | |
1099 | u8 *mac = NULL; | |
1100 | struct fcoe_softc *fc; | |
1101 | struct fcoe_hdr *hp; | |
1102 | ||
4469c195 | 1103 | set_user_nice(current, -20); |
85b4aa49 RL |
1104 | |
1105 | while (!kthread_should_stop()) { | |
1106 | ||
1107 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1108 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
1109 | set_current_state(TASK_INTERRUPTIBLE); | |
1110 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1111 | schedule(); | |
1112 | set_current_state(TASK_RUNNING); | |
1113 | if (kthread_should_stop()) | |
1114 | return 0; | |
1115 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1116 | } | |
1117 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1118 | fr = fcoe_dev_from_skb(skb); | |
1119 | lp = fr->fr_dev; | |
1120 | if (unlikely(lp == NULL)) { | |
1121 | FC_DBG("invalid HBA Structure"); | |
1122 | kfree_skb(skb); | |
1123 | continue; | |
1124 | } | |
1125 | ||
85b4aa49 RL |
1126 | if (unlikely(debug_fcoe)) { |
1127 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p " | |
1128 | "tail:%p end:%p sum:%d dev:%s", | |
1129 | skb->len, skb->data_len, | |
1130 | skb->head, skb->data, skb_tail_pointer(skb), | |
1131 | skb_end_pointer(skb), skb->csum, | |
1132 | skb->dev ? skb->dev->name : "<NULL>"); | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Save source MAC address before discarding header. | |
1137 | */ | |
1138 | fc = lport_priv(lp); | |
1139 | if (unlikely(fc->flogi_progress)) | |
1140 | mac = eth_hdr(skb)->h_source; | |
1141 | ||
1142 | if (skb_is_nonlinear(skb)) | |
1143 | skb_linearize(skb); /* not ideal */ | |
1144 | ||
1145 | /* | |
1146 | * Frame length checks and setting up the header pointers | |
1147 | * was done in fcoe_rcv already. | |
1148 | */ | |
1149 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
1150 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1151 | ||
582b45bc | 1152 | stats = fc_lport_get_stats(lp); |
85b4aa49 | 1153 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
582b45bc RL |
1154 | if (stats->ErrorFrames < 5) |
1155 | printk(KERN_WARNING "FCoE version " | |
1156 | "mismatch: The frame has " | |
1157 | "version %x, but the " | |
1158 | "initiator supports version " | |
1159 | "%x\n", FC_FCOE_DECAPS_VER(hp), | |
1160 | FC_FCOE_VER); | |
1161 | stats->ErrorFrames++; | |
85b4aa49 RL |
1162 | kfree_skb(skb); |
1163 | continue; | |
1164 | } | |
1165 | ||
1166 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
1167 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
1168 | ||
582b45bc RL |
1169 | stats->RxFrames++; |
1170 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
85b4aa49 RL |
1171 | |
1172 | fp = (struct fc_frame *)skb; | |
1173 | fc_frame_init(fp); | |
1174 | fr_dev(fp) = lp; | |
1175 | fr_sof(fp) = hp->fcoe_sof; | |
1176 | ||
1177 | /* Copy out the CRC and EOF trailer for access */ | |
1178 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
1179 | kfree_skb(skb); | |
1180 | continue; | |
1181 | } | |
1182 | fr_eof(fp) = crc_eof.fcoe_eof; | |
1183 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
1184 | if (pskb_trim(skb, fr_len)) { | |
1185 | kfree_skb(skb); | |
1186 | continue; | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * We only check CRC if no offload is available and if it is | |
1191 | * it's solicited data, in which case, the FCP layer would | |
1192 | * check it during the copy. | |
1193 | */ | |
07c00ec4 | 1194 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
85b4aa49 RL |
1195 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
1196 | else | |
1197 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
1198 | ||
1199 | fh = fc_frame_header_get(fp); | |
1200 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
1201 | fh->fh_type == FC_TYPE_FCP) { | |
1202 | fc_exch_recv(lp, lp->emp, fp); | |
1203 | continue; | |
1204 | } | |
1205 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
1206 | if (le32_to_cpu(fr_crc(fp)) != | |
1207 | ~crc32(~0, skb->data, fr_len)) { | |
1208 | if (debug_fcoe || stats->InvalidCRCCount < 5) | |
1209 | printk(KERN_WARNING "fcoe: dropping " | |
1210 | "frame with CRC error\n"); | |
1211 | stats->InvalidCRCCount++; | |
1212 | stats->ErrorFrames++; | |
1213 | fc_frame_free(fp); | |
1214 | continue; | |
1215 | } | |
1216 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
1217 | } | |
1218 | /* non flogi and non data exchanges are handled here */ | |
1219 | if (unlikely(fc->flogi_progress)) | |
1220 | fcoe_recv_flogi(fc, fp, mac); | |
1221 | fc_exch_recv(lp, lp->emp, fp); | |
1222 | } | |
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | /** | |
34f42a07 | 1227 | * fcoe_recv_flogi() - flogi receive function |
85b4aa49 RL |
1228 | * @fc: associated fcoe_softc |
1229 | * @fp: the recieved frame | |
1230 | * @sa: the source address of this flogi | |
1231 | * | |
1232 | * This is responsible to parse the flogi response and sets the corresponding | |
1233 | * mac address for the initiator, eitehr OUI based or GW based. | |
1234 | * | |
1235 | * Returns: none | |
34f42a07 | 1236 | */ |
85b4aa49 RL |
1237 | static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa) |
1238 | { | |
1239 | struct fc_frame_header *fh; | |
1240 | u8 op; | |
1241 | ||
1242 | fh = fc_frame_header_get(fp); | |
1243 | if (fh->fh_type != FC_TYPE_ELS) | |
1244 | return; | |
1245 | op = fc_frame_payload_op(fp); | |
1246 | if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP && | |
1247 | fc->flogi_oxid == ntohs(fh->fh_ox_id)) { | |
1248 | /* | |
1249 | * FLOGI accepted. | |
1250 | * If the src mac addr is FC_OUI-based, then we mark the | |
1251 | * address_mode flag to use FC_OUI-based Ethernet DA. | |
1252 | * Otherwise we use the FCoE gateway addr | |
1253 | */ | |
1254 | if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) { | |
1255 | fc->address_mode = FCOE_FCOUI_ADDR_MODE; | |
1256 | } else { | |
1257 | memcpy(fc->dest_addr, sa, ETH_ALEN); | |
1258 | fc->address_mode = FCOE_GW_ADDR_MODE; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Remove any previously-set unicast MAC filter. | |
1263 | * Add secondary FCoE MAC address filter for our OUI. | |
1264 | */ | |
1265 | rtnl_lock(); | |
1266 | if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 })) | |
1267 | dev_unicast_delete(fc->real_dev, fc->data_src_addr, | |
1268 | ETH_ALEN); | |
1269 | fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id); | |
1270 | dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN); | |
1271 | rtnl_unlock(); | |
1272 | ||
1273 | fc->flogi_progress = 0; | |
1274 | } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) { | |
1275 | /* | |
1276 | * Save source MAC for point-to-point responses. | |
1277 | */ | |
1278 | memcpy(fc->dest_addr, sa, ETH_ALEN); | |
1279 | fc->address_mode = FCOE_GW_ADDR_MODE; | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | /** | |
34f42a07 | 1284 | * fcoe_watchdog() - fcoe timer callback |
85b4aa49 RL |
1285 | * @vp: |
1286 | * | |
bc0e17f6 | 1287 | * This checks the pending queue length for fcoe and set lport qfull |
85b4aa49 RL |
1288 | * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the |
1289 | * fcoe_hostlist. | |
1290 | * | |
1291 | * Returns: 0 for success | |
34f42a07 | 1292 | */ |
85b4aa49 RL |
1293 | void fcoe_watchdog(ulong vp) |
1294 | { | |
85b4aa49 | 1295 | struct fcoe_softc *fc; |
85b4aa49 RL |
1296 | |
1297 | read_lock(&fcoe_hostlist_lock); | |
1298 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
c826a314 VD |
1299 | if (fc->lp) |
1300 | fcoe_check_wait_queue(fc->lp); | |
85b4aa49 RL |
1301 | } |
1302 | read_unlock(&fcoe_hostlist_lock); | |
1303 | ||
1304 | fcoe_timer.expires = jiffies + (1 * HZ); | |
1305 | add_timer(&fcoe_timer); | |
1306 | } | |
1307 | ||
1308 | ||
1309 | /** | |
34f42a07 | 1310 | * fcoe_check_wait_queue() - put the skb into fcoe pending xmit queue |
85b4aa49 RL |
1311 | * @lp: the fc_port for this skb |
1312 | * @skb: the associated skb to be xmitted | |
1313 | * | |
1314 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
1315 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 VD |
1316 | * transmitted, return qlen or -1 if a error occurs, then restore |
1317 | * wait_queue and try again later. | |
85b4aa49 RL |
1318 | * |
1319 | * The wait_queue is used when the skb transmit fails. skb will go | |
1320 | * in the wait_queue which will be emptied by the time function OR | |
1321 | * by the next skb transmit. | |
1322 | * | |
1323 | * Returns: 0 for success | |
34f42a07 | 1324 | */ |
85b4aa49 RL |
1325 | static int fcoe_check_wait_queue(struct fc_lport *lp) |
1326 | { | |
55c8bafb | 1327 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 | 1328 | struct sk_buff *skb; |
c826a314 | 1329 | int rc = -1; |
85b4aa49 | 1330 | |
85b4aa49 | 1331 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
c826a314 VD |
1332 | if (fc->fcoe_pending_queue_active) |
1333 | goto out; | |
1334 | fc->fcoe_pending_queue_active = 1; | |
55c8bafb CL |
1335 | |
1336 | while (fc->fcoe_pending_queue.qlen) { | |
1337 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
1338 | fc->fcoe_pending_queue.qlen++; | |
1339 | skb = __skb_dequeue(&fc->fcoe_pending_queue); | |
1340 | ||
1341 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1342 | rc = fcoe_start_io(skb); | |
1343 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1344 | ||
1345 | if (rc) { | |
1346 | __skb_queue_head(&fc->fcoe_pending_queue, skb); | |
1347 | /* undo temporary increment above */ | |
1348 | fc->fcoe_pending_queue.qlen--; | |
1349 | break; | |
85b4aa49 | 1350 | } |
55c8bafb CL |
1351 | /* undo temporary increment above */ |
1352 | fc->fcoe_pending_queue.qlen--; | |
85b4aa49 | 1353 | } |
55c8bafb CL |
1354 | |
1355 | if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) | |
1356 | lp->qfull = 0; | |
c826a314 VD |
1357 | fc->fcoe_pending_queue_active = 0; |
1358 | rc = fc->fcoe_pending_queue.qlen; | |
1359 | out: | |
85b4aa49 | 1360 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
c826a314 | 1361 | return rc; |
85b4aa49 RL |
1362 | } |
1363 | ||
85b4aa49 | 1364 | /** |
34f42a07 RL |
1365 | * fcoe_dev_setup() - setup link change notification interface |
1366 | */ | |
1367 | static void fcoe_dev_setup() | |
85b4aa49 RL |
1368 | { |
1369 | /* | |
1370 | * here setup a interface specific wd time to | |
1371 | * monitor the link state | |
1372 | */ | |
1373 | register_netdevice_notifier(&fcoe_notifier); | |
1374 | } | |
1375 | ||
1376 | /** | |
34f42a07 RL |
1377 | * fcoe_dev_setup() - cleanup link change notification interface |
1378 | */ | |
85b4aa49 RL |
1379 | static void fcoe_dev_cleanup(void) |
1380 | { | |
1381 | unregister_netdevice_notifier(&fcoe_notifier); | |
1382 | } | |
1383 | ||
1384 | /** | |
34f42a07 | 1385 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
1386 | * @notifier: context of the notification |
1387 | * @event: type of event | |
1388 | * @ptr: fixed array for output parsed ifname | |
1389 | * | |
1390 | * This function is called by the ethernet driver in case of link change event | |
1391 | * | |
1392 | * Returns: 0 for success | |
34f42a07 | 1393 | */ |
85b4aa49 RL |
1394 | static int fcoe_device_notification(struct notifier_block *notifier, |
1395 | ulong event, void *ptr) | |
1396 | { | |
1397 | struct fc_lport *lp = NULL; | |
1398 | struct net_device *real_dev = ptr; | |
1399 | struct fcoe_softc *fc; | |
1400 | struct fcoe_dev_stats *stats; | |
bc0e17f6 | 1401 | u32 new_link_up; |
85b4aa49 RL |
1402 | u32 mfs; |
1403 | int rc = NOTIFY_OK; | |
1404 | ||
1405 | read_lock(&fcoe_hostlist_lock); | |
1406 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1407 | if (fc->real_dev == real_dev) { | |
1408 | lp = fc->lp; | |
1409 | break; | |
1410 | } | |
1411 | } | |
1412 | read_unlock(&fcoe_hostlist_lock); | |
1413 | if (lp == NULL) { | |
1414 | rc = NOTIFY_DONE; | |
1415 | goto out; | |
1416 | } | |
1417 | ||
bc0e17f6 | 1418 | new_link_up = lp->link_up; |
85b4aa49 RL |
1419 | switch (event) { |
1420 | case NETDEV_DOWN: | |
1421 | case NETDEV_GOING_DOWN: | |
bc0e17f6 | 1422 | new_link_up = 0; |
85b4aa49 RL |
1423 | break; |
1424 | case NETDEV_UP: | |
1425 | case NETDEV_CHANGE: | |
bc0e17f6 | 1426 | new_link_up = !fcoe_link_ok(lp); |
85b4aa49 RL |
1427 | break; |
1428 | case NETDEV_CHANGEMTU: | |
1429 | mfs = fc->real_dev->mtu - | |
1430 | (sizeof(struct fcoe_hdr) + | |
1431 | sizeof(struct fcoe_crc_eof)); | |
1432 | if (mfs >= FC_MIN_MAX_FRAME) | |
1433 | fc_set_mfs(lp, mfs); | |
bc0e17f6 | 1434 | new_link_up = !fcoe_link_ok(lp); |
85b4aa49 RL |
1435 | break; |
1436 | case NETDEV_REGISTER: | |
1437 | break; | |
1438 | default: | |
1439 | FC_DBG("unknown event %ld call", event); | |
1440 | } | |
bc0e17f6 VD |
1441 | if (lp->link_up != new_link_up) { |
1442 | if (new_link_up) | |
85b4aa49 RL |
1443 | fc_linkup(lp); |
1444 | else { | |
582b45bc RL |
1445 | stats = fc_lport_get_stats(lp); |
1446 | stats->LinkFailureCount++; | |
85b4aa49 RL |
1447 | fc_linkdown(lp); |
1448 | fcoe_clean_pending_queue(lp); | |
1449 | } | |
1450 | } | |
1451 | out: | |
1452 | return rc; | |
1453 | } | |
1454 | ||
1455 | /** | |
34f42a07 | 1456 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
1457 | * @ifname: fixed array for output parsed ifname |
1458 | * @buffer: incoming buffer to be copied | |
1459 | * | |
1460 | * Returns: NULL or ptr to netdeive | |
34f42a07 | 1461 | */ |
85b4aa49 RL |
1462 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
1463 | { | |
1464 | char *cp; | |
1465 | char ifname[IFNAMSIZ + 2]; | |
1466 | ||
1467 | if (buffer) { | |
1468 | strlcpy(ifname, buffer, IFNAMSIZ); | |
1469 | cp = ifname + strlen(ifname); | |
1470 | while (--cp >= ifname && *cp == '\n') | |
1471 | *cp = '\0'; | |
1472 | return dev_get_by_name(&init_net, ifname); | |
1473 | } | |
1474 | return NULL; | |
1475 | } | |
1476 | ||
1477 | /** | |
34f42a07 | 1478 | * fcoe_netdev_to_module_owner() - finds out the nic drive moddule of the netdev |
85b4aa49 RL |
1479 | * @netdev: the target netdev |
1480 | * | |
1481 | * Returns: ptr to the struct module, NULL for failure | |
34f42a07 | 1482 | */ |
b2ab99c9 RL |
1483 | static struct module * |
1484 | fcoe_netdev_to_module_owner(const struct net_device *netdev) | |
85b4aa49 RL |
1485 | { |
1486 | struct device *dev; | |
1487 | ||
1488 | if (!netdev) | |
1489 | return NULL; | |
1490 | ||
1491 | dev = netdev->dev.parent; | |
1492 | if (!dev) | |
1493 | return NULL; | |
1494 | ||
1495 | if (!dev->driver) | |
1496 | return NULL; | |
1497 | ||
1498 | return dev->driver->owner; | |
1499 | } | |
1500 | ||
1501 | /** | |
34f42a07 | 1502 | * fcoe_ethdrv_get() - Hold the Ethernet driver |
85b4aa49 RL |
1503 | * @netdev: the target netdev |
1504 | * | |
34f42a07 RL |
1505 | * Holds the Ethernet driver module by try_module_get() for |
1506 | * the corresponding netdev. | |
1507 | * | |
85b4aa49 | 1508 | * Returns: 0 for succsss |
34f42a07 | 1509 | */ |
85b4aa49 RL |
1510 | static int fcoe_ethdrv_get(const struct net_device *netdev) |
1511 | { | |
1512 | struct module *owner; | |
1513 | ||
1514 | owner = fcoe_netdev_to_module_owner(netdev); | |
1515 | if (owner) { | |
56b854bb JB |
1516 | printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n", |
1517 | module_name(owner), netdev->name); | |
85b4aa49 RL |
1518 | return try_module_get(owner); |
1519 | } | |
1520 | return -ENODEV; | |
1521 | } | |
1522 | ||
1523 | /** | |
34f42a07 | 1524 | * fcoe_ethdrv_put() - Release the Ethernet driver |
85b4aa49 RL |
1525 | * @netdev: the target netdev |
1526 | * | |
34f42a07 RL |
1527 | * Releases the Ethernet driver module by module_put for |
1528 | * the corresponding netdev. | |
1529 | * | |
85b4aa49 | 1530 | * Returns: 0 for succsss |
34f42a07 | 1531 | */ |
85b4aa49 RL |
1532 | static int fcoe_ethdrv_put(const struct net_device *netdev) |
1533 | { | |
1534 | struct module *owner; | |
1535 | ||
1536 | owner = fcoe_netdev_to_module_owner(netdev); | |
1537 | if (owner) { | |
56b854bb JB |
1538 | printk(KERN_DEBUG "fcoe:release driver module %s for %s\n", |
1539 | module_name(owner), netdev->name); | |
85b4aa49 RL |
1540 | module_put(owner); |
1541 | return 0; | |
1542 | } | |
1543 | return -ENODEV; | |
1544 | } | |
1545 | ||
1546 | /** | |
34f42a07 | 1547 | * fcoe_destroy() - handles the destroy from sysfs |
85b4aa49 RL |
1548 | * @buffer: expcted to be a eth if name |
1549 | * @kp: associated kernel param | |
1550 | * | |
1551 | * Returns: 0 for success | |
34f42a07 | 1552 | */ |
85b4aa49 RL |
1553 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
1554 | { | |
1555 | int rc; | |
1556 | struct net_device *netdev; | |
1557 | ||
1558 | netdev = fcoe_if_to_netdev(buffer); | |
1559 | if (!netdev) { | |
1560 | rc = -ENODEV; | |
1561 | goto out_nodev; | |
1562 | } | |
1563 | /* look for existing lport */ | |
1564 | if (!fcoe_hostlist_lookup(netdev)) { | |
1565 | rc = -ENODEV; | |
1566 | goto out_putdev; | |
1567 | } | |
7f349142 | 1568 | rc = fcoe_if_destroy(netdev); |
85b4aa49 | 1569 | if (rc) { |
7f349142 | 1570 | printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n", |
85b4aa49 RL |
1571 | netdev->name); |
1572 | rc = -EIO; | |
1573 | goto out_putdev; | |
1574 | } | |
1575 | fcoe_ethdrv_put(netdev); | |
1576 | rc = 0; | |
1577 | out_putdev: | |
1578 | dev_put(netdev); | |
1579 | out_nodev: | |
1580 | return rc; | |
1581 | } | |
1582 | ||
1583 | /** | |
34f42a07 | 1584 | * fcoe_create() - Handles the create call from sysfs |
85b4aa49 RL |
1585 | * @buffer: expcted to be a eth if name |
1586 | * @kp: associated kernel param | |
1587 | * | |
1588 | * Returns: 0 for success | |
34f42a07 | 1589 | */ |
85b4aa49 RL |
1590 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1591 | { | |
1592 | int rc; | |
1593 | struct net_device *netdev; | |
1594 | ||
1595 | netdev = fcoe_if_to_netdev(buffer); | |
1596 | if (!netdev) { | |
1597 | rc = -ENODEV; | |
1598 | goto out_nodev; | |
1599 | } | |
1600 | /* look for existing lport */ | |
1601 | if (fcoe_hostlist_lookup(netdev)) { | |
1602 | rc = -EEXIST; | |
1603 | goto out_putdev; | |
1604 | } | |
1605 | fcoe_ethdrv_get(netdev); | |
1606 | ||
7f349142 | 1607 | rc = fcoe_if_create(netdev); |
85b4aa49 | 1608 | if (rc) { |
7f349142 | 1609 | printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n", |
85b4aa49 RL |
1610 | netdev->name); |
1611 | fcoe_ethdrv_put(netdev); | |
1612 | rc = -EIO; | |
1613 | goto out_putdev; | |
1614 | } | |
1615 | rc = 0; | |
1616 | out_putdev: | |
1617 | dev_put(netdev); | |
1618 | out_nodev: | |
1619 | return rc; | |
1620 | } | |
1621 | ||
1622 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1623 | __MODULE_PARM_TYPE(create, "string"); | |
1624 | MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); | |
1625 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); | |
1626 | __MODULE_PARM_TYPE(destroy, "string"); | |
1627 | MODULE_PARM_DESC(destroy, "Destroy fcoe port"); | |
1628 | ||
34f42a07 RL |
1629 | /** |
1630 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1631 | * @lp: ptr to the fc_lport |
1632 | * | |
1633 | * Any permanently-disqualifying conditions have been previously checked. | |
1634 | * This also updates the speed setting, which may change with link for 100/1000. | |
1635 | * | |
1636 | * This function should probably be checking for PAUSE support at some point | |
1637 | * in the future. Currently Per-priority-pause is not determinable using | |
1638 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1639 | * | |
1640 | * Returns: 0 if link is OK for use by FCoE. | |
1641 | * | |
1642 | */ | |
1643 | int fcoe_link_ok(struct fc_lport *lp) | |
1644 | { | |
fc47ff6b | 1645 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 RL |
1646 | struct net_device *dev = fc->real_dev; |
1647 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; | |
1648 | int rc = 0; | |
1649 | ||
1650 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) { | |
1651 | dev = fc->phys_dev; | |
1652 | if (dev->ethtool_ops->get_settings) { | |
1653 | dev->ethtool_ops->get_settings(dev, &ecmd); | |
1654 | lp->link_supported_speeds &= | |
1655 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1656 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1657 | SUPPORTED_1000baseT_Full)) | |
1658 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1659 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1660 | lp->link_supported_speeds |= | |
1661 | FC_PORTSPEED_10GBIT; | |
1662 | if (ecmd.speed == SPEED_1000) | |
1663 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1664 | if (ecmd.speed == SPEED_10000) | |
1665 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
1666 | } | |
1667 | } else | |
1668 | rc = -1; | |
1669 | ||
1670 | return rc; | |
1671 | } | |
1672 | EXPORT_SYMBOL_GPL(fcoe_link_ok); | |
1673 | ||
34f42a07 RL |
1674 | /** |
1675 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 RL |
1676 | * @lp: the fc_lport |
1677 | */ | |
1678 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1679 | { | |
85b4aa49 RL |
1680 | struct fcoe_percpu_s *pp; |
1681 | struct fcoe_rcv_info *fr; | |
1682 | struct sk_buff_head *list; | |
1683 | struct sk_buff *skb, *next; | |
1684 | struct sk_buff *head; | |
5e5e92df | 1685 | unsigned int cpu; |
85b4aa49 | 1686 | |
5e5e92df RL |
1687 | for_each_possible_cpu(cpu) { |
1688 | pp = &per_cpu(fcoe_percpu, cpu); | |
1689 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1690 | list = &pp->fcoe_rx_list; | |
1691 | head = list->next; | |
1692 | for (skb = head; skb != (struct sk_buff *)list; | |
1693 | skb = next) { | |
1694 | next = skb->next; | |
1695 | fr = fcoe_dev_from_skb(skb); | |
1696 | if (fr->fr_dev == lp) { | |
1697 | __skb_unlink(skb, list); | |
1698 | kfree_skb(skb); | |
85b4aa49 | 1699 | } |
85b4aa49 | 1700 | } |
5e5e92df | 1701 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
85b4aa49 RL |
1702 | } |
1703 | } | |
1704 | EXPORT_SYMBOL_GPL(fcoe_percpu_clean); | |
1705 | ||
1706 | /** | |
34f42a07 | 1707 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1708 | * @lp: the corresponding fc_lport |
1709 | * | |
1710 | * Returns: none | |
34f42a07 | 1711 | */ |
85b4aa49 RL |
1712 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1713 | { | |
1714 | struct fcoe_softc *fc = lport_priv(lp); | |
1715 | struct sk_buff *skb; | |
1716 | ||
1717 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1718 | while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { | |
1719 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1720 | kfree_skb(skb); | |
1721 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1722 | } | |
1723 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1724 | } | |
1725 | EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue); | |
1726 | ||
1727 | /** | |
34f42a07 | 1728 | * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport |
85b4aa49 RL |
1729 | * @sht: ptr to the scsi host templ |
1730 | * @priv_size: size of private data after fc_lport | |
1731 | * | |
1732 | * Returns: ptr to Scsi_Host | |
34f42a07 | 1733 | * TODO: to libfc? |
85b4aa49 | 1734 | */ |
b2ab99c9 RL |
1735 | static inline struct Scsi_Host * |
1736 | libfc_host_alloc(struct scsi_host_template *sht, int priv_size) | |
85b4aa49 RL |
1737 | { |
1738 | return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size); | |
1739 | } | |
1740 | ||
1741 | /** | |
34f42a07 | 1742 | * fcoe_host_alloc() - Allocate a Scsi_Host with room for the fcoe_softc |
85b4aa49 RL |
1743 | * @sht: ptr to the scsi host templ |
1744 | * @priv_size: size of private data after fc_lport | |
1745 | * | |
1746 | * Returns: ptr to Scsi_Host | |
1747 | */ | |
1748 | struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size) | |
1749 | { | |
1750 | return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size); | |
1751 | } | |
1752 | EXPORT_SYMBOL_GPL(fcoe_host_alloc); | |
1753 | ||
34f42a07 RL |
1754 | /** |
1755 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
1756 | * @shost: shost the reset is from |
1757 | * | |
1758 | * Returns: always 0 | |
1759 | */ | |
1760 | int fcoe_reset(struct Scsi_Host *shost) | |
1761 | { | |
1762 | struct fc_lport *lport = shost_priv(shost); | |
1763 | fc_lport_reset(lport); | |
1764 | return 0; | |
1765 | } | |
1766 | EXPORT_SYMBOL_GPL(fcoe_reset); | |
1767 | ||
34f42a07 RL |
1768 | /** |
1769 | * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN. | |
85b4aa49 RL |
1770 | * @mac: mac address |
1771 | * @scheme: check port | |
1772 | * @port: port indicator for converting | |
1773 | * | |
1774 | * Returns: u64 fc world wide name | |
1775 | */ | |
1776 | u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN], | |
1777 | unsigned int scheme, unsigned int port) | |
1778 | { | |
1779 | u64 wwn; | |
1780 | u64 host_mac; | |
1781 | ||
1782 | /* The MAC is in NO, so flip only the low 48 bits */ | |
1783 | host_mac = ((u64) mac[0] << 40) | | |
1784 | ((u64) mac[1] << 32) | | |
1785 | ((u64) mac[2] << 24) | | |
1786 | ((u64) mac[3] << 16) | | |
1787 | ((u64) mac[4] << 8) | | |
1788 | (u64) mac[5]; | |
1789 | ||
1790 | WARN_ON(host_mac >= (1ULL << 48)); | |
1791 | wwn = host_mac | ((u64) scheme << 60); | |
1792 | switch (scheme) { | |
1793 | case 1: | |
1794 | WARN_ON(port != 0); | |
1795 | break; | |
1796 | case 2: | |
1797 | WARN_ON(port >= 0xfff); | |
1798 | wwn |= (u64) port << 48; | |
1799 | break; | |
1800 | default: | |
1801 | WARN_ON(1); | |
1802 | break; | |
1803 | } | |
1804 | ||
1805 | return wwn; | |
1806 | } | |
1807 | EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac); | |
34f42a07 RL |
1808 | |
1809 | /** | |
1810 | * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device | |
85b4aa49 RL |
1811 | * @device: this is currently ptr to net_device |
1812 | * | |
1813 | * Returns: NULL or the located fcoe_softc | |
1814 | */ | |
b2ab99c9 RL |
1815 | static struct fcoe_softc * |
1816 | fcoe_hostlist_lookup_softc(const struct net_device *dev) | |
85b4aa49 RL |
1817 | { |
1818 | struct fcoe_softc *fc; | |
1819 | ||
1820 | read_lock(&fcoe_hostlist_lock); | |
1821 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1822 | if (fc->real_dev == dev) { | |
1823 | read_unlock(&fcoe_hostlist_lock); | |
1824 | return fc; | |
1825 | } | |
1826 | } | |
1827 | read_unlock(&fcoe_hostlist_lock); | |
1828 | return NULL; | |
1829 | } | |
1830 | ||
34f42a07 RL |
1831 | /** |
1832 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
1833 | * @netdev: ptr to net_device |
1834 | * | |
1835 | * Returns: 0 for success | |
1836 | */ | |
1837 | struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) | |
1838 | { | |
1839 | struct fcoe_softc *fc; | |
1840 | ||
1841 | fc = fcoe_hostlist_lookup_softc(netdev); | |
1842 | ||
1843 | return (fc) ? fc->lp : NULL; | |
1844 | } | |
1845 | EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup); | |
1846 | ||
34f42a07 RL |
1847 | /** |
1848 | * fcoe_hostlist_add() - Add a lport to lports list | |
85b4aa49 RL |
1849 | * @lp: ptr to the fc_lport to badded |
1850 | * | |
1851 | * Returns: 0 for success | |
1852 | */ | |
1853 | int fcoe_hostlist_add(const struct fc_lport *lp) | |
1854 | { | |
1855 | struct fcoe_softc *fc; | |
1856 | ||
1857 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1858 | if (!fc) { | |
fc47ff6b | 1859 | fc = lport_priv(lp); |
85b4aa49 RL |
1860 | write_lock_bh(&fcoe_hostlist_lock); |
1861 | list_add_tail(&fc->list, &fcoe_hostlist); | |
1862 | write_unlock_bh(&fcoe_hostlist_lock); | |
1863 | } | |
1864 | return 0; | |
1865 | } | |
1866 | EXPORT_SYMBOL_GPL(fcoe_hostlist_add); | |
1867 | ||
34f42a07 RL |
1868 | /** |
1869 | * fcoe_hostlist_remove() - remove a lport from lports list | |
85b4aa49 RL |
1870 | * @lp: ptr to the fc_lport to badded |
1871 | * | |
1872 | * Returns: 0 for success | |
1873 | */ | |
1874 | int fcoe_hostlist_remove(const struct fc_lport *lp) | |
1875 | { | |
1876 | struct fcoe_softc *fc; | |
1877 | ||
1878 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1879 | BUG_ON(!fc); | |
1880 | write_lock_bh(&fcoe_hostlist_lock); | |
1881 | list_del(&fc->list); | |
1882 | write_unlock_bh(&fcoe_hostlist_lock); | |
1883 | ||
1884 | return 0; | |
1885 | } | |
1886 | EXPORT_SYMBOL_GPL(fcoe_hostlist_remove); | |
1887 | ||
1888 | /** | |
34f42a07 | 1889 | * fcoe_libfc_config() - sets up libfc related properties for lport |
85b4aa49 RL |
1890 | * @lp: ptr to the fc_lport |
1891 | * @tt: libfc function template | |
1892 | * | |
1893 | * Returns : 0 for success | |
34f42a07 | 1894 | */ |
85b4aa49 RL |
1895 | int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt) |
1896 | { | |
1897 | /* Set the function pointers set by the LLDD */ | |
1898 | memcpy(&lp->tt, tt, sizeof(*tt)); | |
1899 | if (fc_fcp_init(lp)) | |
1900 | return -ENOMEM; | |
1901 | fc_exch_init(lp); | |
1902 | fc_elsct_init(lp); | |
1903 | fc_lport_init(lp); | |
1904 | fc_rport_init(lp); | |
1905 | fc_disc_init(lp); | |
1906 | ||
1907 | return 0; | |
1908 | } | |
1909 | EXPORT_SYMBOL_GPL(fcoe_libfc_config); | |
1910 | ||
1911 | /** | |
34f42a07 | 1912 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 | 1913 | * |
85b4aa49 | 1914 | * Returns 0 on success, negative on failure |
34f42a07 | 1915 | */ |
85b4aa49 RL |
1916 | static int __init fcoe_init(void) |
1917 | { | |
38eccabd | 1918 | unsigned int cpu; |
8976f424 | 1919 | int rc = 0; |
85b4aa49 RL |
1920 | struct fcoe_percpu_s *p; |
1921 | ||
85b4aa49 RL |
1922 | INIT_LIST_HEAD(&fcoe_hostlist); |
1923 | rwlock_init(&fcoe_hostlist_lock); | |
1924 | ||
38eccabd | 1925 | for_each_possible_cpu(cpu) { |
5e5e92df | 1926 | p = &per_cpu(fcoe_percpu, cpu); |
38eccabd RL |
1927 | skb_queue_head_init(&p->fcoe_rx_list); |
1928 | } | |
1929 | ||
8976f424 RL |
1930 | for_each_online_cpu(cpu) |
1931 | fcoe_percpu_thread_create(cpu); | |
85b4aa49 | 1932 | |
8976f424 RL |
1933 | /* Initialize per CPU interrupt thread */ |
1934 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); | |
1935 | if (rc) | |
1936 | goto out_free; | |
85b4aa49 | 1937 | |
8976f424 | 1938 | /* Setup link change notification */ |
85b4aa49 RL |
1939 | fcoe_dev_setup(); |
1940 | ||
a468f328 RL |
1941 | setup_timer(&fcoe_timer, fcoe_watchdog, 0); |
1942 | ||
1943 | mod_timer(&fcoe_timer, jiffies + (10 * HZ)); | |
85b4aa49 | 1944 | |
7f349142 | 1945 | fcoe_if_init(); |
85b4aa49 RL |
1946 | |
1947 | return 0; | |
8976f424 RL |
1948 | |
1949 | out_free: | |
1950 | for_each_online_cpu(cpu) { | |
1951 | fcoe_percpu_thread_destroy(cpu); | |
1952 | } | |
1953 | ||
1954 | return rc; | |
85b4aa49 RL |
1955 | } |
1956 | module_init(fcoe_init); | |
1957 | ||
1958 | /** | |
34f42a07 | 1959 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
1960 | * |
1961 | * Returns 0 on success, negative on failure | |
34f42a07 | 1962 | */ |
85b4aa49 RL |
1963 | static void __exit fcoe_exit(void) |
1964 | { | |
5e5e92df | 1965 | unsigned int cpu; |
85b4aa49 | 1966 | struct fcoe_softc *fc, *tmp; |
85b4aa49 | 1967 | |
85b4aa49 RL |
1968 | fcoe_dev_cleanup(); |
1969 | ||
582b45bc | 1970 | /* Stop the timer */ |
85b4aa49 RL |
1971 | del_timer_sync(&fcoe_timer); |
1972 | ||
5919a595 | 1973 | /* releases the associated fcoe hosts */ |
85b4aa49 | 1974 | list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
7f349142 | 1975 | fcoe_if_destroy(fc->real_dev); |
85b4aa49 | 1976 | |
8976f424 RL |
1977 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
1978 | ||
1979 | for_each_online_cpu(cpu) { | |
1980 | fcoe_percpu_thread_destroy(cpu); | |
85b4aa49 RL |
1981 | } |
1982 | ||
7f349142 VD |
1983 | /* detach from scsi transport */ |
1984 | fcoe_if_exit(); | |
85b4aa49 RL |
1985 | } |
1986 | module_exit(fcoe_exit); |