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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> | |
97c8389d | 40 | #include <scsi/fc/fc_fip.h> |
85b4aa49 RL |
41 | |
42 | #include <scsi/libfc.h> | |
43 | #include <scsi/fc_frame.h> | |
44 | #include <scsi/libfcoe.h> | |
85b4aa49 | 45 | |
fdd78027 | 46 | #include "fcoe.h" |
7f349142 | 47 | |
fdd78027 | 48 | static int debug_fcoe; |
7f349142 | 49 | |
85b4aa49 RL |
50 | MODULE_AUTHOR("Open-FCoE.org"); |
51 | MODULE_DESCRIPTION("FCoE"); | |
9b34ecff | 52 | MODULE_LICENSE("GPL v2"); |
85b4aa49 RL |
53 | |
54 | /* fcoe host list */ | |
55 | LIST_HEAD(fcoe_hostlist); | |
56 | DEFINE_RWLOCK(fcoe_hostlist_lock); | |
57 | DEFINE_TIMER(fcoe_timer, NULL, 0, 0); | |
5e5e92df | 58 | DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
85b4aa49 | 59 | |
dd3fd72e | 60 | /* Function Prototypes */ |
fdd78027 VD |
61 | static int fcoe_reset(struct Scsi_Host *shost); |
62 | static int fcoe_xmit(struct fc_lport *, struct fc_frame *); | |
63 | static int fcoe_rcv(struct sk_buff *, struct net_device *, | |
64 | struct packet_type *, struct net_device *); | |
65 | static int fcoe_percpu_receive_thread(void *arg); | |
66 | static void fcoe_clean_pending_queue(struct fc_lport *lp); | |
67 | static void fcoe_percpu_clean(struct fc_lport *lp); | |
68 | static int fcoe_link_ok(struct fc_lport *lp); | |
69 | ||
70 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); | |
71 | static int fcoe_hostlist_add(const struct fc_lport *); | |
72 | static int fcoe_hostlist_remove(const struct fc_lport *); | |
73 | ||
4bb6b515 | 74 | static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *); |
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 | |
7f349142 VD |
141 | * |
142 | * Returns: 0 for success | |
143 | */ | |
144 | static int fcoe_lport_config(struct fc_lport *lp) | |
145 | { | |
146 | lp->link_up = 0; | |
147 | lp->qfull = 0; | |
148 | lp->max_retry_count = 3; | |
a3666955 | 149 | lp->max_rport_retry_count = 3; |
7f349142 VD |
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); | |
97c8389d | 188 | fc->ctlr.lp = lp; |
7f349142 VD |
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 | ||
7f349142 VD |
213 | /* offload features support */ |
214 | if (fc->real_dev->features & NETIF_F_SG) | |
215 | lp->sg_supp = 1; | |
216 | ||
217 | #ifdef NETIF_F_FCOE_CRC | |
218 | if (netdev->features & NETIF_F_FCOE_CRC) { | |
219 | lp->crc_offload = 1; | |
220 | printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n", | |
221 | netdev->name); | |
222 | } | |
223 | #endif | |
224 | #ifdef NETIF_F_FSO | |
225 | if (netdev->features & NETIF_F_FSO) { | |
226 | lp->seq_offload = 1; | |
227 | lp->lso_max = netdev->gso_max_size; | |
228 | printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n", | |
229 | netdev->name, lp->lso_max); | |
230 | } | |
231 | #endif | |
232 | if (netdev->fcoe_ddp_xid) { | |
233 | lp->lro_enabled = 1; | |
234 | lp->lro_xid = netdev->fcoe_ddp_xid; | |
235 | printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n", | |
236 | netdev->name, lp->lro_xid); | |
237 | } | |
238 | skb_queue_head_init(&fc->fcoe_pending_queue); | |
239 | fc->fcoe_pending_queue_active = 0; | |
240 | ||
241 | /* setup Source Mac Address */ | |
97c8389d | 242 | memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr, |
7f349142 VD |
243 | fc->real_dev->addr_len); |
244 | ||
245 | wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0); | |
246 | fc_set_wwnn(lp, wwnn); | |
247 | /* XXX - 3rd arg needs to be vlan id */ | |
248 | wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0); | |
249 | fc_set_wwpn(lp, wwpn); | |
250 | ||
251 | /* | |
252 | * Add FCoE MAC address as second unicast MAC address | |
253 | * or enter promiscuous mode if not capable of listening | |
254 | * for multiple unicast MACs. | |
255 | */ | |
256 | rtnl_lock(); | |
257 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
258 | dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN); | |
6401bdca | 259 | dev_mc_add(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); |
7f349142 VD |
260 | rtnl_unlock(); |
261 | ||
262 | /* | |
263 | * setup the receive function from ethernet driver | |
264 | * on the ethertype for the given device | |
265 | */ | |
266 | fc->fcoe_packet_type.func = fcoe_rcv; | |
267 | fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); | |
268 | fc->fcoe_packet_type.dev = fc->real_dev; | |
269 | dev_add_pack(&fc->fcoe_packet_type); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | /** | |
275 | * fcoe_shost_config() - Sets up fc_lport->host | |
276 | * @lp : ptr to the fc_lport | |
277 | * @shost : ptr to the associated scsi host | |
278 | * @dev : device associated to scsi host | |
279 | * | |
280 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() | |
281 | * | |
282 | * Returns : 0 for success | |
283 | */ | |
284 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, | |
285 | struct device *dev) | |
286 | { | |
287 | int rc = 0; | |
288 | ||
289 | /* lport scsi host config */ | |
290 | lp->host = shost; | |
291 | ||
292 | lp->host->max_lun = FCOE_MAX_LUN; | |
293 | lp->host->max_id = FCOE_MAX_FCP_TARGET; | |
294 | lp->host->max_channel = 0; | |
295 | lp->host->transportt = scsi_transport_fcoe_sw; | |
296 | ||
297 | /* add the new host to the SCSI-ml */ | |
298 | rc = scsi_add_host(lp->host, dev); | |
299 | if (rc) { | |
300 | FC_DBG("fcoe_shost_config:error on scsi_add_host\n"); | |
301 | return rc; | |
302 | } | |
303 | sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", | |
304 | FCOE_NAME, FCOE_VERSION, | |
305 | fcoe_netdev(lp)->name); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | /** | |
311 | * fcoe_em_config() - allocates em for this lport | |
312 | * @lp: the port that em is to allocated for | |
313 | * | |
314 | * Returns : 0 on success | |
315 | */ | |
316 | static inline int fcoe_em_config(struct fc_lport *lp) | |
317 | { | |
318 | BUG_ON(lp->emp); | |
319 | ||
320 | lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3, | |
321 | FCOE_MIN_XID, FCOE_MAX_XID); | |
322 | if (!lp->emp) | |
323 | return -ENOMEM; | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | /** | |
329 | * fcoe_if_destroy() - FCoE software HBA tear-down function | |
330 | * @netdev: ptr to the associated net_device | |
331 | * | |
332 | * Returns: 0 if link is OK for use by FCoE. | |
333 | */ | |
334 | static int fcoe_if_destroy(struct net_device *netdev) | |
335 | { | |
336 | struct fc_lport *lp = NULL; | |
337 | struct fcoe_softc *fc; | |
338 | u8 flogi_maddr[ETH_ALEN]; | |
339 | ||
340 | BUG_ON(!netdev); | |
341 | ||
342 | printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n", | |
343 | netdev->name); | |
344 | ||
345 | lp = fcoe_hostlist_lookup(netdev); | |
346 | if (!lp) | |
347 | return -ENODEV; | |
348 | ||
349 | fc = lport_priv(lp); | |
350 | ||
351 | /* Logout of the fabric */ | |
352 | fc_fabric_logoff(lp); | |
353 | ||
354 | /* Remove the instance from fcoe's list */ | |
355 | fcoe_hostlist_remove(lp); | |
356 | ||
357 | /* Don't listen for Ethernet packets anymore */ | |
358 | dev_remove_pack(&fc->fcoe_packet_type); | |
97c8389d JE |
359 | dev_remove_pack(&fc->fip_packet_type); |
360 | fcoe_ctlr_destroy(&fc->ctlr); | |
7f349142 VD |
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); | |
97c8389d JE |
378 | if (!is_zero_ether_addr(fc->ctlr.data_src_addr)) |
379 | dev_unicast_delete(fc->real_dev, | |
380 | fc->ctlr.data_src_addr, ETH_ALEN); | |
381 | dev_mc_delete(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); | |
7f349142 VD |
382 | rtnl_unlock(); |
383 | ||
dd3fd72e | 384 | /* Free the per-CPU receive threads */ |
7f349142 VD |
385 | fcoe_percpu_clean(lp); |
386 | ||
387 | /* Free existing skbs */ | |
388 | fcoe_clean_pending_queue(lp); | |
389 | ||
390 | /* Free memory used by statistical counters */ | |
391 | fc_lport_free_stats(lp); | |
392 | ||
393 | /* Release the net_device and Scsi_Host */ | |
394 | dev_put(fc->real_dev); | |
395 | scsi_host_put(lp->host); | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | /* | |
401 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device | |
402 | * @lp: the corresponding fc_lport | |
403 | * @xid: the exchange id for this ddp transfer | |
404 | * @sgl: the scatterlist describing this transfer | |
405 | * @sgc: number of sg items | |
406 | * | |
407 | * Returns : 0 no ddp | |
408 | */ | |
409 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, | |
410 | struct scatterlist *sgl, unsigned int sgc) | |
411 | { | |
412 | struct net_device *n = fcoe_netdev(lp); | |
413 | ||
414 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup) | |
415 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | /* | |
421 | * fcoe_ddp_done - calls LLD's ddp_done through net_device | |
422 | * @lp: the corresponding fc_lport | |
423 | * @xid: the exchange id for this ddp transfer | |
424 | * | |
425 | * Returns : the length of data that have been completed by ddp | |
426 | */ | |
427 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) | |
428 | { | |
429 | struct net_device *n = fcoe_netdev(lp); | |
430 | ||
431 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done) | |
432 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static struct libfc_function_template fcoe_libfc_fcn_templ = { | |
437 | .frame_send = fcoe_xmit, | |
438 | .ddp_setup = fcoe_ddp_setup, | |
439 | .ddp_done = fcoe_ddp_done, | |
440 | }; | |
441 | ||
97c8389d JE |
442 | /** |
443 | * fcoe_fip_recv - handle a received FIP frame. | |
444 | * @skb: the receive skb | |
445 | * @dev: associated &net_device | |
446 | * @ptype: the &packet_type structure which was used to register this handler. | |
447 | * @orig_dev: original receive &net_device, in case @dev is a bond. | |
448 | * | |
449 | * Returns: 0 for success | |
450 | */ | |
451 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, | |
452 | struct packet_type *ptype, | |
453 | struct net_device *orig_dev) | |
454 | { | |
455 | struct fcoe_softc *fc; | |
456 | ||
457 | fc = container_of(ptype, struct fcoe_softc, fip_packet_type); | |
458 | fcoe_ctlr_recv(&fc->ctlr, skb); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | /** | |
463 | * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame. | |
464 | * @fip: FCoE controller. | |
465 | * @skb: FIP Packet. | |
466 | */ | |
467 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
468 | { | |
469 | skb->dev = fcoe_from_ctlr(fip)->real_dev; | |
470 | dev_queue_xmit(skb); | |
471 | } | |
472 | ||
473 | /** | |
474 | * fcoe_update_src_mac() - Update Ethernet MAC filters. | |
475 | * @fip: FCoE controller. | |
476 | * @old: Unicast MAC address to delete if the MAC is non-zero. | |
477 | * @new: Unicast MAC address to add. | |
478 | * | |
479 | * Remove any previously-set unicast MAC filter. | |
480 | * Add secondary FCoE MAC address filter for our OUI. | |
481 | */ | |
482 | static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new) | |
483 | { | |
484 | struct fcoe_softc *fc; | |
485 | ||
486 | fc = fcoe_from_ctlr(fip); | |
487 | rtnl_lock(); | |
488 | if (!is_zero_ether_addr(old)) | |
489 | dev_unicast_delete(fc->real_dev, old, ETH_ALEN); | |
490 | dev_unicast_add(fc->real_dev, new, ETH_ALEN); | |
491 | rtnl_unlock(); | |
492 | } | |
493 | ||
7f349142 VD |
494 | /** |
495 | * fcoe_if_create() - this function creates the fcoe interface | |
496 | * @netdev: pointer the associated netdevice | |
497 | * | |
498 | * Creates fc_lport struct and scsi_host for lport, configures lport | |
499 | * and starts fabric login. | |
500 | * | |
501 | * Returns : 0 on success | |
502 | */ | |
503 | static int fcoe_if_create(struct net_device *netdev) | |
504 | { | |
505 | int rc; | |
506 | struct fc_lport *lp = NULL; | |
507 | struct fcoe_softc *fc; | |
508 | struct Scsi_Host *shost; | |
509 | ||
510 | BUG_ON(!netdev); | |
511 | ||
512 | printk(KERN_DEBUG "fcoe_if_create:interface on %s\n", | |
513 | netdev->name); | |
514 | ||
515 | lp = fcoe_hostlist_lookup(netdev); | |
516 | if (lp) | |
517 | return -EEXIST; | |
518 | ||
a0a25da2 VD |
519 | shost = libfc_host_alloc(&fcoe_shost_template, |
520 | sizeof(struct fcoe_softc)); | |
7f349142 VD |
521 | if (!shost) { |
522 | FC_DBG("Could not allocate host structure\n"); | |
523 | return -ENOMEM; | |
524 | } | |
525 | lp = shost_priv(shost); | |
526 | fc = lport_priv(lp); | |
527 | ||
528 | /* configure fc_lport, e.g., em */ | |
529 | rc = fcoe_lport_config(lp); | |
530 | if (rc) { | |
531 | FC_DBG("Could not configure lport\n"); | |
532 | goto out_host_put; | |
533 | } | |
534 | ||
535 | /* configure lport network properties */ | |
536 | rc = fcoe_netdev_config(lp, netdev); | |
537 | if (rc) { | |
538 | FC_DBG("Could not configure netdev for lport\n"); | |
539 | goto out_host_put; | |
540 | } | |
541 | ||
97c8389d JE |
542 | /* |
543 | * Initialize FIP. | |
544 | */ | |
545 | fcoe_ctlr_init(&fc->ctlr); | |
546 | fc->ctlr.send = fcoe_fip_send; | |
547 | fc->ctlr.update_mac = fcoe_update_src_mac; | |
548 | ||
549 | fc->fip_packet_type.func = fcoe_fip_recv; | |
550 | fc->fip_packet_type.type = htons(ETH_P_FIP); | |
551 | fc->fip_packet_type.dev = fc->real_dev; | |
552 | dev_add_pack(&fc->fip_packet_type); | |
553 | ||
7f349142 VD |
554 | /* configure lport scsi host properties */ |
555 | rc = fcoe_shost_config(lp, shost, &netdev->dev); | |
556 | if (rc) { | |
557 | FC_DBG("Could not configure shost for lport\n"); | |
558 | goto out_host_put; | |
559 | } | |
560 | ||
561 | /* lport exch manager allocation */ | |
562 | rc = fcoe_em_config(lp); | |
563 | if (rc) { | |
564 | FC_DBG("Could not configure em for lport\n"); | |
565 | goto out_host_put; | |
566 | } | |
567 | ||
568 | /* Initialize the library */ | |
569 | rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ); | |
570 | if (rc) { | |
571 | FC_DBG("Could not configure libfc for lport!\n"); | |
572 | goto out_lp_destroy; | |
573 | } | |
574 | ||
575 | /* add to lports list */ | |
576 | fcoe_hostlist_add(lp); | |
577 | ||
578 | lp->boot_time = jiffies; | |
579 | ||
580 | fc_fabric_login(lp); | |
581 | ||
97c8389d JE |
582 | if (!fcoe_link_ok(lp)) |
583 | fcoe_ctlr_link_up(&fc->ctlr); | |
584 | ||
7f349142 VD |
585 | dev_hold(netdev); |
586 | ||
587 | return rc; | |
588 | ||
589 | out_lp_destroy: | |
590 | fc_exch_mgr_free(lp->emp); /* Free the EM */ | |
591 | out_host_put: | |
592 | scsi_host_put(lp->host); | |
593 | return rc; | |
594 | } | |
595 | ||
596 | /** | |
597 | * fcoe_if_init() - attach to scsi transport | |
598 | * | |
599 | * Returns : 0 on success | |
600 | */ | |
601 | static int __init fcoe_if_init(void) | |
602 | { | |
603 | /* attach to scsi transport */ | |
604 | scsi_transport_fcoe_sw = | |
605 | fc_attach_transport(&fcoe_transport_function); | |
606 | ||
607 | if (!scsi_transport_fcoe_sw) { | |
608 | printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n"); | |
609 | return -ENODEV; | |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | /** | |
616 | * fcoe_if_exit() - detach from scsi transport | |
617 | * | |
618 | * Returns : 0 on success | |
619 | */ | |
620 | int __exit fcoe_if_exit(void) | |
621 | { | |
622 | fc_release_transport(scsi_transport_fcoe_sw); | |
623 | return 0; | |
624 | } | |
625 | ||
8976f424 RL |
626 | /** |
627 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu | |
628 | * @cpu: cpu index for the online cpu | |
629 | */ | |
630 | static void fcoe_percpu_thread_create(unsigned int cpu) | |
631 | { | |
632 | struct fcoe_percpu_s *p; | |
633 | struct task_struct *thread; | |
634 | ||
635 | p = &per_cpu(fcoe_percpu, cpu); | |
636 | ||
637 | thread = kthread_create(fcoe_percpu_receive_thread, | |
638 | (void *)p, "fcoethread/%d", cpu); | |
639 | ||
640 | if (likely(!IS_ERR(p->thread))) { | |
641 | kthread_bind(thread, cpu); | |
642 | wake_up_process(thread); | |
643 | ||
644 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
645 | p->thread = thread; | |
646 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
647 | } | |
648 | } | |
649 | ||
650 | /** | |
651 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu | |
652 | * @cpu: cpu index the rx thread is to be removed | |
653 | * | |
654 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the | |
655 | * current CPU's Rx thread. If the thread being destroyed is bound to | |
656 | * the CPU processing this context the skbs will be freed. | |
657 | */ | |
658 | static void fcoe_percpu_thread_destroy(unsigned int cpu) | |
659 | { | |
660 | struct fcoe_percpu_s *p; | |
661 | struct task_struct *thread; | |
662 | struct page *crc_eof; | |
663 | struct sk_buff *skb; | |
664 | #ifdef CONFIG_SMP | |
665 | struct fcoe_percpu_s *p0; | |
666 | unsigned targ_cpu = smp_processor_id(); | |
667 | #endif /* CONFIG_SMP */ | |
668 | ||
669 | printk(KERN_DEBUG "fcoe: Destroying receive thread for CPU %d\n", cpu); | |
670 | ||
671 | /* Prevent any new skbs from being queued for this CPU. */ | |
672 | p = &per_cpu(fcoe_percpu, cpu); | |
673 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
674 | thread = p->thread; | |
675 | p->thread = NULL; | |
676 | crc_eof = p->crc_eof_page; | |
677 | p->crc_eof_page = NULL; | |
678 | p->crc_eof_offset = 0; | |
679 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
680 | ||
681 | #ifdef CONFIG_SMP | |
682 | /* | |
683 | * Don't bother moving the skb's if this context is running | |
684 | * on the same CPU that is having its thread destroyed. This | |
685 | * can easily happen when the module is removed. | |
686 | */ | |
687 | if (cpu != targ_cpu) { | |
688 | p0 = &per_cpu(fcoe_percpu, targ_cpu); | |
689 | spin_lock_bh(&p0->fcoe_rx_list.lock); | |
690 | if (p0->thread) { | |
691 | FC_DBG("Moving frames from CPU %d to CPU %d\n", | |
692 | cpu, targ_cpu); | |
693 | ||
694 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
695 | __skb_queue_tail(&p0->fcoe_rx_list, skb); | |
696 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
697 | } else { | |
698 | /* | |
699 | * The targeted CPU is not initialized and cannot accept | |
700 | * new skbs. Unlock the targeted CPU and drop the skbs | |
701 | * on the CPU that is going offline. | |
702 | */ | |
703 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
704 | kfree_skb(skb); | |
705 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
706 | } | |
707 | } else { | |
708 | /* | |
709 | * This scenario occurs when the module is being removed | |
710 | * and all threads are being destroyed. skbs will continue | |
711 | * to be shifted from the CPU thread that is being removed | |
712 | * to the CPU thread associated with the CPU that is processing | |
713 | * the module removal. Once there is only one CPU Rx thread it | |
714 | * will reach this case and we will drop all skbs and later | |
715 | * stop the thread. | |
716 | */ | |
717 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
718 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
719 | kfree_skb(skb); | |
720 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
721 | } | |
722 | #else | |
723 | /* | |
dd3fd72e | 724 | * This a non-SMP scenario where the singular Rx thread is |
8976f424 RL |
725 | * being removed. Free all skbs and stop the thread. |
726 | */ | |
727 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
728 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
729 | kfree_skb(skb); | |
730 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
731 | #endif | |
732 | ||
733 | if (thread) | |
734 | kthread_stop(thread); | |
735 | ||
736 | if (crc_eof) | |
737 | put_page(crc_eof); | |
738 | } | |
739 | ||
740 | /** | |
741 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback | |
742 | * @nfb: callback data block | |
743 | * @action: event triggering the callback | |
744 | * @hcpu: index for the cpu of this event | |
745 | * | |
746 | * This creates or destroys per cpu data for fcoe | |
747 | * | |
748 | * Returns NOTIFY_OK always. | |
749 | */ | |
750 | static int fcoe_cpu_callback(struct notifier_block *nfb, | |
751 | unsigned long action, void *hcpu) | |
752 | { | |
753 | unsigned cpu = (unsigned long)hcpu; | |
754 | ||
755 | switch (action) { | |
756 | case CPU_ONLINE: | |
757 | case CPU_ONLINE_FROZEN: | |
758 | FC_DBG("CPU %x online: Create Rx thread\n", cpu); | |
759 | fcoe_percpu_thread_create(cpu); | |
760 | break; | |
761 | case CPU_DEAD: | |
762 | case CPU_DEAD_FROZEN: | |
763 | FC_DBG("CPU %x offline: Remove Rx thread\n", cpu); | |
764 | fcoe_percpu_thread_destroy(cpu); | |
765 | break; | |
766 | default: | |
767 | break; | |
768 | } | |
769 | return NOTIFY_OK; | |
770 | } | |
771 | ||
772 | static struct notifier_block fcoe_cpu_notifier = { | |
773 | .notifier_call = fcoe_cpu_callback, | |
774 | }; | |
775 | ||
85b4aa49 | 776 | /** |
34f42a07 | 777 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
778 | * @skb: the receive skb |
779 | * @dev: associated net device | |
780 | * @ptype: context | |
dd3fd72e | 781 | * @olddev: last device |
85b4aa49 RL |
782 | * |
783 | * this function will receive the packet and build fc frame and pass it up | |
784 | * | |
785 | * Returns: 0 for success | |
34f42a07 | 786 | */ |
85b4aa49 RL |
787 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
788 | struct packet_type *ptype, struct net_device *olddev) | |
789 | { | |
790 | struct fc_lport *lp; | |
791 | struct fcoe_rcv_info *fr; | |
792 | struct fcoe_softc *fc; | |
85b4aa49 | 793 | struct fc_frame_header *fh; |
85b4aa49 | 794 | struct fcoe_percpu_s *fps; |
38eccabd | 795 | unsigned short oxid; |
8976f424 | 796 | unsigned int cpu = 0; |
85b4aa49 RL |
797 | |
798 | fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); | |
97c8389d | 799 | lp = fc->ctlr.lp; |
85b4aa49 RL |
800 | if (unlikely(lp == NULL)) { |
801 | FC_DBG("cannot find hba structure"); | |
802 | goto err2; | |
803 | } | |
97c8389d JE |
804 | if (!lp->link_up) |
805 | goto err2; | |
85b4aa49 RL |
806 | |
807 | if (unlikely(debug_fcoe)) { | |
808 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p " | |
809 | "end:%p sum:%d dev:%s", skb->len, skb->data_len, | |
810 | skb->head, skb->data, skb_tail_pointer(skb), | |
811 | skb_end_pointer(skb), skb->csum, | |
812 | skb->dev ? skb->dev->name : "<NULL>"); | |
813 | ||
814 | } | |
815 | ||
816 | /* check for FCOE packet type */ | |
817 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
818 | FC_DBG("wrong FC type frame"); | |
819 | goto err; | |
820 | } | |
821 | ||
822 | /* | |
823 | * Check for minimum frame length, and make sure required FCoE | |
824 | * and FC headers are pulled into the linear data area. | |
825 | */ | |
826 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
827 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
828 | goto err; | |
829 | ||
830 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
831 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
832 | ||
833 | oxid = ntohs(fh->fh_ox_id); | |
834 | ||
835 | fr = fcoe_dev_from_skb(skb); | |
836 | fr->fr_dev = lp; | |
837 | fr->ptype = ptype; | |
5e5e92df | 838 | |
85b4aa49 RL |
839 | #ifdef CONFIG_SMP |
840 | /* | |
841 | * The incoming frame exchange id(oxid) is ANDed with num of online | |
8976f424 RL |
842 | * cpu bits to get cpu and then this cpu is used for selecting |
843 | * a per cpu kernel thread from fcoe_percpu. | |
85b4aa49 | 844 | */ |
8976f424 | 845 | cpu = oxid & (num_online_cpus() - 1); |
85b4aa49 | 846 | #endif |
5e5e92df | 847 | |
8976f424 | 848 | fps = &per_cpu(fcoe_percpu, cpu); |
85b4aa49 | 849 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
8976f424 RL |
850 | if (unlikely(!fps->thread)) { |
851 | /* | |
852 | * The targeted CPU is not ready, let's target | |
853 | * the first CPU now. For non-SMP systems this | |
854 | * will check the same CPU twice. | |
855 | */ | |
856 | FC_DBG("CPU is online, but no receive thread ready " | |
857 | "for incoming skb- using first online CPU.\n"); | |
858 | ||
859 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
860 | cpu = first_cpu(cpu_online_map); | |
861 | fps = &per_cpu(fcoe_percpu, cpu); | |
862 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
863 | if (!fps->thread) { | |
864 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
865 | goto err; | |
866 | } | |
867 | } | |
868 | ||
869 | /* | |
870 | * We now have a valid CPU that we're targeting for | |
871 | * this skb. We also have this receive thread locked, | |
872 | * so we're free to queue skbs into it's queue. | |
873 | */ | |
85b4aa49 RL |
874 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
875 | if (fps->fcoe_rx_list.qlen == 1) | |
876 | wake_up_process(fps->thread); | |
877 | ||
878 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
879 | ||
880 | return 0; | |
881 | err: | |
582b45bc | 882 | fc_lport_get_stats(lp)->ErrorFrames++; |
85b4aa49 RL |
883 | |
884 | err2: | |
885 | kfree_skb(skb); | |
886 | return -1; | |
887 | } | |
85b4aa49 RL |
888 | |
889 | /** | |
34f42a07 | 890 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
891 | * @skb: the skb to be xmitted |
892 | * | |
893 | * Returns: 0 for success | |
34f42a07 | 894 | */ |
85b4aa49 RL |
895 | static inline int fcoe_start_io(struct sk_buff *skb) |
896 | { | |
897 | int rc; | |
898 | ||
899 | skb_get(skb); | |
900 | rc = dev_queue_xmit(skb); | |
901 | if (rc != 0) | |
902 | return rc; | |
903 | kfree_skb(skb); | |
904 | return 0; | |
905 | } | |
906 | ||
907 | /** | |
dd3fd72e | 908 | * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof |
85b4aa49 RL |
909 | * @skb: the skb to be xmitted |
910 | * @tlen: total len | |
911 | * | |
912 | * Returns: 0 for success | |
34f42a07 | 913 | */ |
85b4aa49 RL |
914 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
915 | { | |
916 | struct fcoe_percpu_s *fps; | |
917 | struct page *page; | |
85b4aa49 | 918 | |
5e5e92df | 919 | fps = &get_cpu_var(fcoe_percpu); |
85b4aa49 RL |
920 | page = fps->crc_eof_page; |
921 | if (!page) { | |
922 | page = alloc_page(GFP_ATOMIC); | |
923 | if (!page) { | |
5e5e92df | 924 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
925 | return -ENOMEM; |
926 | } | |
927 | fps->crc_eof_page = page; | |
8976f424 | 928 | fps->crc_eof_offset = 0; |
85b4aa49 RL |
929 | } |
930 | ||
931 | get_page(page); | |
932 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
933 | fps->crc_eof_offset, tlen); | |
934 | skb->len += tlen; | |
935 | skb->data_len += tlen; | |
936 | skb->truesize += tlen; | |
937 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
938 | ||
939 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
940 | fps->crc_eof_page = NULL; | |
941 | fps->crc_eof_offset = 0; | |
942 | put_page(page); | |
943 | } | |
5e5e92df | 944 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
945 | return 0; |
946 | } | |
947 | ||
948 | /** | |
34f42a07 | 949 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
dd3fd72e | 950 | * @fp: the fc_frame containing data to be checksummed |
85b4aa49 RL |
951 | * |
952 | * This uses crc32() to calculate the crc for fc frame | |
953 | * Return : 32 bit crc | |
34f42a07 | 954 | */ |
85b4aa49 RL |
955 | u32 fcoe_fc_crc(struct fc_frame *fp) |
956 | { | |
957 | struct sk_buff *skb = fp_skb(fp); | |
958 | struct skb_frag_struct *frag; | |
959 | unsigned char *data; | |
960 | unsigned long off, len, clen; | |
961 | u32 crc; | |
962 | unsigned i; | |
963 | ||
964 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
965 | ||
966 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
967 | frag = &skb_shinfo(skb)->frags[i]; | |
968 | off = frag->page_offset; | |
969 | len = frag->size; | |
970 | while (len > 0) { | |
971 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
972 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
973 | KM_SKB_DATA_SOFTIRQ); | |
974 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
975 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
976 | off += clen; | |
977 | len -= clen; | |
978 | } | |
979 | } | |
980 | return crc; | |
981 | } | |
85b4aa49 RL |
982 | |
983 | /** | |
34f42a07 | 984 | * fcoe_xmit() - FCoE frame transmit function |
85b4aa49 RL |
985 | * @lp: the associated local port |
986 | * @fp: the fc_frame to be transmitted | |
987 | * | |
988 | * Return : 0 for success | |
34f42a07 | 989 | */ |
85b4aa49 RL |
990 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
991 | { | |
4bb6b515 | 992 | int wlen; |
85b4aa49 RL |
993 | u32 crc; |
994 | struct ethhdr *eh; | |
995 | struct fcoe_crc_eof *cp; | |
996 | struct sk_buff *skb; | |
997 | struct fcoe_dev_stats *stats; | |
998 | struct fc_frame_header *fh; | |
999 | unsigned int hlen; /* header length implies the version */ | |
1000 | unsigned int tlen; /* trailer length */ | |
1001 | unsigned int elen; /* eth header, may include vlan */ | |
85b4aa49 RL |
1002 | struct fcoe_softc *fc; |
1003 | u8 sof, eof; | |
1004 | struct fcoe_hdr *hp; | |
1005 | ||
1006 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
1007 | ||
fc47ff6b | 1008 | fc = lport_priv(lp); |
85b4aa49 | 1009 | fh = fc_frame_header_get(fp); |
97c8389d JE |
1010 | skb = fp_skb(fp); |
1011 | wlen = skb->len / FCOE_WORD_TO_BYTE; | |
1012 | ||
1013 | if (!lp->link_up) { | |
3caf02ee | 1014 | kfree_skb(skb); |
97c8389d | 1015 | return 0; |
85b4aa49 RL |
1016 | } |
1017 | ||
97c8389d JE |
1018 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) && |
1019 | fcoe_ctlr_els_send(&fc->ctlr, skb)) | |
1020 | return 0; | |
1021 | ||
85b4aa49 RL |
1022 | sof = fr_sof(fp); |
1023 | eof = fr_eof(fp); | |
1024 | ||
1025 | elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ? | |
1026 | sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr); | |
1027 | hlen = sizeof(struct fcoe_hdr); | |
1028 | tlen = sizeof(struct fcoe_crc_eof); | |
1029 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
1030 | ||
1031 | /* crc offload */ | |
1032 | if (likely(lp->crc_offload)) { | |
39ca9a06 | 1033 | skb->ip_summed = CHECKSUM_PARTIAL; |
85b4aa49 RL |
1034 | skb->csum_start = skb_headroom(skb); |
1035 | skb->csum_offset = skb->len; | |
1036 | crc = 0; | |
1037 | } else { | |
1038 | skb->ip_summed = CHECKSUM_NONE; | |
1039 | crc = fcoe_fc_crc(fp); | |
1040 | } | |
1041 | ||
1042 | /* copy fc crc and eof to the skb buff */ | |
1043 | if (skb_is_nonlinear(skb)) { | |
1044 | skb_frag_t *frag; | |
1045 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 1046 | kfree_skb(skb); |
85b4aa49 RL |
1047 | return -ENOMEM; |
1048 | } | |
1049 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
1050 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
1051 | + frag->page_offset; | |
1052 | } else { | |
1053 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
1054 | } | |
1055 | ||
1056 | memset(cp, 0, sizeof(*cp)); | |
1057 | cp->fcoe_eof = eof; | |
1058 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
1059 | ||
1060 | if (skb_is_nonlinear(skb)) { | |
1061 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
1062 | cp = NULL; | |
1063 | } | |
1064 | ||
dd3fd72e | 1065 | /* adjust skb network/transport offsets to match mac/fcoe/fc */ |
85b4aa49 RL |
1066 | skb_push(skb, elen + hlen); |
1067 | skb_reset_mac_header(skb); | |
1068 | skb_reset_network_header(skb); | |
1069 | skb->mac_len = elen; | |
211c738d | 1070 | skb->protocol = htons(ETH_P_FCOE); |
85b4aa49 RL |
1071 | skb->dev = fc->real_dev; |
1072 | ||
1073 | /* fill up mac and fcoe headers */ | |
1074 | eh = eth_hdr(skb); | |
1075 | eh->h_proto = htons(ETH_P_FCOE); | |
97c8389d | 1076 | if (fc->ctlr.map_dest) |
85b4aa49 RL |
1077 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); |
1078 | else | |
1079 | /* insert GW address */ | |
97c8389d | 1080 | memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN); |
85b4aa49 | 1081 | |
97c8389d JE |
1082 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
1083 | memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN); | |
85b4aa49 | 1084 | else |
97c8389d | 1085 | memcpy(eh->h_source, fc->ctlr.data_src_addr, ETH_ALEN); |
85b4aa49 RL |
1086 | |
1087 | hp = (struct fcoe_hdr *)(eh + 1); | |
1088 | memset(hp, 0, sizeof(*hp)); | |
1089 | if (FC_FCOE_VER) | |
1090 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
1091 | hp->fcoe_sof = sof; | |
1092 | ||
39ca9a06 YZ |
1093 | #ifdef NETIF_F_FSO |
1094 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ | |
1095 | if (lp->seq_offload && fr_max_payload(fp)) { | |
1096 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; | |
1097 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); | |
1098 | } else { | |
1099 | skb_shinfo(skb)->gso_type = 0; | |
1100 | skb_shinfo(skb)->gso_size = 0; | |
1101 | } | |
1102 | #endif | |
85b4aa49 | 1103 | /* update tx stats: regardless if LLD fails */ |
582b45bc RL |
1104 | stats = fc_lport_get_stats(lp); |
1105 | stats->TxFrames++; | |
1106 | stats->TxWords += wlen; | |
85b4aa49 RL |
1107 | |
1108 | /* send down to lld */ | |
1109 | fr_dev(fp) = lp; | |
1110 | if (fc->fcoe_pending_queue.qlen) | |
4bb6b515 VD |
1111 | fcoe_check_wait_queue(lp, skb); |
1112 | else if (fcoe_start_io(skb)) | |
1113 | fcoe_check_wait_queue(lp, skb); | |
85b4aa49 RL |
1114 | |
1115 | return 0; | |
1116 | } | |
85b4aa49 | 1117 | |
34f42a07 RL |
1118 | /** |
1119 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
1120 | * @arg: ptr to the fcoe per cpu struct |
1121 | * | |
1122 | * Return: 0 for success | |
85b4aa49 RL |
1123 | */ |
1124 | int fcoe_percpu_receive_thread(void *arg) | |
1125 | { | |
1126 | struct fcoe_percpu_s *p = arg; | |
1127 | u32 fr_len; | |
1128 | struct fc_lport *lp; | |
1129 | struct fcoe_rcv_info *fr; | |
1130 | struct fcoe_dev_stats *stats; | |
1131 | struct fc_frame_header *fh; | |
1132 | struct sk_buff *skb; | |
1133 | struct fcoe_crc_eof crc_eof; | |
1134 | struct fc_frame *fp; | |
1135 | u8 *mac = NULL; | |
1136 | struct fcoe_softc *fc; | |
1137 | struct fcoe_hdr *hp; | |
1138 | ||
4469c195 | 1139 | set_user_nice(current, -20); |
85b4aa49 RL |
1140 | |
1141 | while (!kthread_should_stop()) { | |
1142 | ||
1143 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1144 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
1145 | set_current_state(TASK_INTERRUPTIBLE); | |
1146 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1147 | schedule(); | |
1148 | set_current_state(TASK_RUNNING); | |
1149 | if (kthread_should_stop()) | |
1150 | return 0; | |
1151 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1152 | } | |
1153 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1154 | fr = fcoe_dev_from_skb(skb); | |
1155 | lp = fr->fr_dev; | |
1156 | if (unlikely(lp == NULL)) { | |
1157 | FC_DBG("invalid HBA Structure"); | |
1158 | kfree_skb(skb); | |
1159 | continue; | |
1160 | } | |
1161 | ||
85b4aa49 RL |
1162 | if (unlikely(debug_fcoe)) { |
1163 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p " | |
1164 | "tail:%p end:%p sum:%d dev:%s", | |
1165 | skb->len, skb->data_len, | |
1166 | skb->head, skb->data, skb_tail_pointer(skb), | |
1167 | skb_end_pointer(skb), skb->csum, | |
1168 | skb->dev ? skb->dev->name : "<NULL>"); | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * Save source MAC address before discarding header. | |
1173 | */ | |
1174 | fc = lport_priv(lp); | |
85b4aa49 RL |
1175 | if (skb_is_nonlinear(skb)) |
1176 | skb_linearize(skb); /* not ideal */ | |
97c8389d | 1177 | mac = eth_hdr(skb)->h_source; |
85b4aa49 RL |
1178 | |
1179 | /* | |
1180 | * Frame length checks and setting up the header pointers | |
1181 | * was done in fcoe_rcv already. | |
1182 | */ | |
1183 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
1184 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1185 | ||
582b45bc | 1186 | stats = fc_lport_get_stats(lp); |
85b4aa49 | 1187 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
582b45bc RL |
1188 | if (stats->ErrorFrames < 5) |
1189 | printk(KERN_WARNING "FCoE version " | |
1190 | "mismatch: The frame has " | |
1191 | "version %x, but the " | |
1192 | "initiator supports version " | |
1193 | "%x\n", FC_FCOE_DECAPS_VER(hp), | |
1194 | FC_FCOE_VER); | |
1195 | stats->ErrorFrames++; | |
85b4aa49 RL |
1196 | kfree_skb(skb); |
1197 | continue; | |
1198 | } | |
1199 | ||
1200 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
1201 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
1202 | ||
582b45bc RL |
1203 | stats->RxFrames++; |
1204 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
85b4aa49 RL |
1205 | |
1206 | fp = (struct fc_frame *)skb; | |
1207 | fc_frame_init(fp); | |
1208 | fr_dev(fp) = lp; | |
1209 | fr_sof(fp) = hp->fcoe_sof; | |
1210 | ||
1211 | /* Copy out the CRC and EOF trailer for access */ | |
1212 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
1213 | kfree_skb(skb); | |
1214 | continue; | |
1215 | } | |
1216 | fr_eof(fp) = crc_eof.fcoe_eof; | |
1217 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
1218 | if (pskb_trim(skb, fr_len)) { | |
1219 | kfree_skb(skb); | |
1220 | continue; | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * We only check CRC if no offload is available and if it is | |
1225 | * it's solicited data, in which case, the FCP layer would | |
1226 | * check it during the copy. | |
1227 | */ | |
07c00ec4 | 1228 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
85b4aa49 RL |
1229 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
1230 | else | |
1231 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
1232 | ||
1233 | fh = fc_frame_header_get(fp); | |
1234 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
1235 | fh->fh_type == FC_TYPE_FCP) { | |
1236 | fc_exch_recv(lp, lp->emp, fp); | |
1237 | continue; | |
1238 | } | |
1239 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
1240 | if (le32_to_cpu(fr_crc(fp)) != | |
1241 | ~crc32(~0, skb->data, fr_len)) { | |
1242 | if (debug_fcoe || stats->InvalidCRCCount < 5) | |
1243 | printk(KERN_WARNING "fcoe: dropping " | |
1244 | "frame with CRC error\n"); | |
1245 | stats->InvalidCRCCount++; | |
1246 | stats->ErrorFrames++; | |
1247 | fc_frame_free(fp); | |
1248 | continue; | |
1249 | } | |
1250 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
1251 | } | |
97c8389d JE |
1252 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) && |
1253 | fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) { | |
1254 | fc_frame_free(fp); | |
1255 | continue; | |
1256 | } | |
85b4aa49 RL |
1257 | fc_exch_recv(lp, lp->emp, fp); |
1258 | } | |
1259 | return 0; | |
1260 | } | |
1261 | ||
85b4aa49 | 1262 | /** |
34f42a07 | 1263 | * fcoe_watchdog() - fcoe timer callback |
85b4aa49 RL |
1264 | * @vp: |
1265 | * | |
bc0e17f6 | 1266 | * This checks the pending queue length for fcoe and set lport qfull |
85b4aa49 RL |
1267 | * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the |
1268 | * fcoe_hostlist. | |
1269 | * | |
1270 | * Returns: 0 for success | |
34f42a07 | 1271 | */ |
85b4aa49 RL |
1272 | void fcoe_watchdog(ulong vp) |
1273 | { | |
85b4aa49 | 1274 | struct fcoe_softc *fc; |
85b4aa49 RL |
1275 | |
1276 | read_lock(&fcoe_hostlist_lock); | |
1277 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
97c8389d | 1278 | if (fc->ctlr.lp) |
4bb6b515 | 1279 | fcoe_check_wait_queue(fc->ctlr.lp, NULL); |
85b4aa49 RL |
1280 | } |
1281 | read_unlock(&fcoe_hostlist_lock); | |
1282 | ||
1283 | fcoe_timer.expires = jiffies + (1 * HZ); | |
1284 | add_timer(&fcoe_timer); | |
1285 | } | |
1286 | ||
1287 | ||
1288 | /** | |
dd3fd72e CL |
1289 | * fcoe_check_wait_queue() - attempt to clear the transmit backlog |
1290 | * @lp: the fc_lport | |
85b4aa49 RL |
1291 | * |
1292 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
1293 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 | 1294 | * transmitted, return qlen or -1 if a error occurs, then restore |
dd3fd72e | 1295 | * wait_queue and try again later. |
85b4aa49 RL |
1296 | * |
1297 | * The wait_queue is used when the skb transmit fails. skb will go | |
dd3fd72e | 1298 | * in the wait_queue which will be emptied by the timer function or |
85b4aa49 | 1299 | * by the next skb transmit. |
34f42a07 | 1300 | */ |
4bb6b515 | 1301 | static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb) |
85b4aa49 | 1302 | { |
55c8bafb | 1303 | struct fcoe_softc *fc = lport_priv(lp); |
4bb6b515 | 1304 | int rc; |
85b4aa49 | 1305 | |
85b4aa49 | 1306 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
4bb6b515 VD |
1307 | |
1308 | if (skb) | |
1309 | __skb_queue_tail(&fc->fcoe_pending_queue, skb); | |
1310 | ||
c826a314 VD |
1311 | if (fc->fcoe_pending_queue_active) |
1312 | goto out; | |
1313 | fc->fcoe_pending_queue_active = 1; | |
55c8bafb CL |
1314 | |
1315 | while (fc->fcoe_pending_queue.qlen) { | |
1316 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
1317 | fc->fcoe_pending_queue.qlen++; | |
1318 | skb = __skb_dequeue(&fc->fcoe_pending_queue); | |
1319 | ||
1320 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1321 | rc = fcoe_start_io(skb); | |
1322 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1323 | ||
1324 | if (rc) { | |
1325 | __skb_queue_head(&fc->fcoe_pending_queue, skb); | |
1326 | /* undo temporary increment above */ | |
1327 | fc->fcoe_pending_queue.qlen--; | |
1328 | break; | |
85b4aa49 | 1329 | } |
55c8bafb CL |
1330 | /* undo temporary increment above */ |
1331 | fc->fcoe_pending_queue.qlen--; | |
85b4aa49 | 1332 | } |
55c8bafb CL |
1333 | |
1334 | if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) | |
1335 | lp->qfull = 0; | |
c826a314 | 1336 | fc->fcoe_pending_queue_active = 0; |
c826a314 | 1337 | out: |
4bb6b515 VD |
1338 | if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
1339 | lp->qfull = 1; | |
85b4aa49 | 1340 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
4bb6b515 | 1341 | return; |
85b4aa49 RL |
1342 | } |
1343 | ||
85b4aa49 | 1344 | /** |
34f42a07 RL |
1345 | * fcoe_dev_setup() - setup link change notification interface |
1346 | */ | |
b0d428ad | 1347 | static void fcoe_dev_setup(void) |
85b4aa49 | 1348 | { |
85b4aa49 RL |
1349 | register_netdevice_notifier(&fcoe_notifier); |
1350 | } | |
1351 | ||
1352 | /** | |
b0d428ad | 1353 | * fcoe_dev_cleanup() - cleanup link change notification interface |
34f42a07 | 1354 | */ |
85b4aa49 RL |
1355 | static void fcoe_dev_cleanup(void) |
1356 | { | |
1357 | unregister_netdevice_notifier(&fcoe_notifier); | |
1358 | } | |
1359 | ||
1360 | /** | |
34f42a07 | 1361 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
1362 | * @notifier: context of the notification |
1363 | * @event: type of event | |
1364 | * @ptr: fixed array for output parsed ifname | |
1365 | * | |
1366 | * This function is called by the ethernet driver in case of link change event | |
1367 | * | |
1368 | * Returns: 0 for success | |
34f42a07 | 1369 | */ |
85b4aa49 RL |
1370 | static int fcoe_device_notification(struct notifier_block *notifier, |
1371 | ulong event, void *ptr) | |
1372 | { | |
1373 | struct fc_lport *lp = NULL; | |
1374 | struct net_device *real_dev = ptr; | |
1375 | struct fcoe_softc *fc; | |
1376 | struct fcoe_dev_stats *stats; | |
97c8389d | 1377 | u32 link_possible = 1; |
85b4aa49 RL |
1378 | u32 mfs; |
1379 | int rc = NOTIFY_OK; | |
1380 | ||
1381 | read_lock(&fcoe_hostlist_lock); | |
1382 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1383 | if (fc->real_dev == real_dev) { | |
97c8389d | 1384 | lp = fc->ctlr.lp; |
85b4aa49 RL |
1385 | break; |
1386 | } | |
1387 | } | |
1388 | read_unlock(&fcoe_hostlist_lock); | |
1389 | if (lp == NULL) { | |
1390 | rc = NOTIFY_DONE; | |
1391 | goto out; | |
1392 | } | |
1393 | ||
85b4aa49 RL |
1394 | switch (event) { |
1395 | case NETDEV_DOWN: | |
1396 | case NETDEV_GOING_DOWN: | |
97c8389d | 1397 | link_possible = 0; |
85b4aa49 RL |
1398 | break; |
1399 | case NETDEV_UP: | |
1400 | case NETDEV_CHANGE: | |
85b4aa49 RL |
1401 | break; |
1402 | case NETDEV_CHANGEMTU: | |
1403 | mfs = fc->real_dev->mtu - | |
1404 | (sizeof(struct fcoe_hdr) + | |
1405 | sizeof(struct fcoe_crc_eof)); | |
1406 | if (mfs >= FC_MIN_MAX_FRAME) | |
1407 | fc_set_mfs(lp, mfs); | |
85b4aa49 RL |
1408 | break; |
1409 | case NETDEV_REGISTER: | |
1410 | break; | |
1411 | default: | |
97c8389d | 1412 | FC_DBG("Unknown event %ld from netdev netlink\n", event); |
85b4aa49 | 1413 | } |
97c8389d JE |
1414 | if (link_possible && !fcoe_link_ok(lp)) |
1415 | fcoe_ctlr_link_up(&fc->ctlr); | |
1416 | else if (fcoe_ctlr_link_down(&fc->ctlr)) { | |
1417 | stats = fc_lport_get_stats(lp); | |
1418 | stats->LinkFailureCount++; | |
1419 | fcoe_clean_pending_queue(lp); | |
85b4aa49 RL |
1420 | } |
1421 | out: | |
1422 | return rc; | |
1423 | } | |
1424 | ||
1425 | /** | |
34f42a07 | 1426 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
1427 | * @buffer: incoming buffer to be copied |
1428 | * | |
dd3fd72e | 1429 | * Returns: NULL or ptr to net_device |
34f42a07 | 1430 | */ |
85b4aa49 RL |
1431 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
1432 | { | |
1433 | char *cp; | |
1434 | char ifname[IFNAMSIZ + 2]; | |
1435 | ||
1436 | if (buffer) { | |
1437 | strlcpy(ifname, buffer, IFNAMSIZ); | |
1438 | cp = ifname + strlen(ifname); | |
1439 | while (--cp >= ifname && *cp == '\n') | |
1440 | *cp = '\0'; | |
1441 | return dev_get_by_name(&init_net, ifname); | |
1442 | } | |
1443 | return NULL; | |
1444 | } | |
1445 | ||
1446 | /** | |
dd3fd72e | 1447 | * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev |
85b4aa49 RL |
1448 | * @netdev: the target netdev |
1449 | * | |
1450 | * Returns: ptr to the struct module, NULL for failure | |
34f42a07 | 1451 | */ |
b2ab99c9 RL |
1452 | static struct module * |
1453 | fcoe_netdev_to_module_owner(const struct net_device *netdev) | |
85b4aa49 RL |
1454 | { |
1455 | struct device *dev; | |
1456 | ||
1457 | if (!netdev) | |
1458 | return NULL; | |
1459 | ||
1460 | dev = netdev->dev.parent; | |
1461 | if (!dev) | |
1462 | return NULL; | |
1463 | ||
1464 | if (!dev->driver) | |
1465 | return NULL; | |
1466 | ||
1467 | return dev->driver->owner; | |
1468 | } | |
1469 | ||
1470 | /** | |
34f42a07 | 1471 | * fcoe_ethdrv_get() - Hold the Ethernet driver |
85b4aa49 RL |
1472 | * @netdev: the target netdev |
1473 | * | |
34f42a07 RL |
1474 | * Holds the Ethernet driver module by try_module_get() for |
1475 | * the corresponding netdev. | |
1476 | * | |
dd3fd72e | 1477 | * Returns: 0 for success |
34f42a07 | 1478 | */ |
85b4aa49 RL |
1479 | static int fcoe_ethdrv_get(const struct net_device *netdev) |
1480 | { | |
1481 | struct module *owner; | |
1482 | ||
1483 | owner = fcoe_netdev_to_module_owner(netdev); | |
1484 | if (owner) { | |
56b854bb JB |
1485 | printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n", |
1486 | module_name(owner), netdev->name); | |
85b4aa49 RL |
1487 | return try_module_get(owner); |
1488 | } | |
1489 | return -ENODEV; | |
1490 | } | |
1491 | ||
1492 | /** | |
34f42a07 | 1493 | * fcoe_ethdrv_put() - Release the Ethernet driver |
85b4aa49 RL |
1494 | * @netdev: the target netdev |
1495 | * | |
34f42a07 RL |
1496 | * Releases the Ethernet driver module by module_put for |
1497 | * the corresponding netdev. | |
1498 | * | |
dd3fd72e | 1499 | * Returns: 0 for success |
34f42a07 | 1500 | */ |
85b4aa49 RL |
1501 | static int fcoe_ethdrv_put(const struct net_device *netdev) |
1502 | { | |
1503 | struct module *owner; | |
1504 | ||
1505 | owner = fcoe_netdev_to_module_owner(netdev); | |
1506 | if (owner) { | |
56b854bb JB |
1507 | printk(KERN_DEBUG "fcoe:release driver module %s for %s\n", |
1508 | module_name(owner), netdev->name); | |
85b4aa49 RL |
1509 | module_put(owner); |
1510 | return 0; | |
1511 | } | |
1512 | return -ENODEV; | |
1513 | } | |
1514 | ||
1515 | /** | |
34f42a07 | 1516 | * fcoe_destroy() - handles the destroy from sysfs |
dd3fd72e | 1517 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1518 | * @kp: associated kernel param |
1519 | * | |
1520 | * Returns: 0 for success | |
34f42a07 | 1521 | */ |
85b4aa49 RL |
1522 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
1523 | { | |
1524 | int rc; | |
1525 | struct net_device *netdev; | |
1526 | ||
1527 | netdev = fcoe_if_to_netdev(buffer); | |
1528 | if (!netdev) { | |
1529 | rc = -ENODEV; | |
1530 | goto out_nodev; | |
1531 | } | |
1532 | /* look for existing lport */ | |
1533 | if (!fcoe_hostlist_lookup(netdev)) { | |
1534 | rc = -ENODEV; | |
1535 | goto out_putdev; | |
1536 | } | |
7f349142 | 1537 | rc = fcoe_if_destroy(netdev); |
85b4aa49 | 1538 | if (rc) { |
7f349142 | 1539 | printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n", |
85b4aa49 RL |
1540 | netdev->name); |
1541 | rc = -EIO; | |
1542 | goto out_putdev; | |
1543 | } | |
1544 | fcoe_ethdrv_put(netdev); | |
1545 | rc = 0; | |
1546 | out_putdev: | |
1547 | dev_put(netdev); | |
1548 | out_nodev: | |
1549 | return rc; | |
1550 | } | |
1551 | ||
1552 | /** | |
34f42a07 | 1553 | * fcoe_create() - Handles the create call from sysfs |
dd3fd72e | 1554 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1555 | * @kp: associated kernel param |
1556 | * | |
1557 | * Returns: 0 for success | |
34f42a07 | 1558 | */ |
85b4aa49 RL |
1559 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1560 | { | |
1561 | int rc; | |
1562 | struct net_device *netdev; | |
1563 | ||
1564 | netdev = fcoe_if_to_netdev(buffer); | |
1565 | if (!netdev) { | |
1566 | rc = -ENODEV; | |
1567 | goto out_nodev; | |
1568 | } | |
1569 | /* look for existing lport */ | |
1570 | if (fcoe_hostlist_lookup(netdev)) { | |
1571 | rc = -EEXIST; | |
1572 | goto out_putdev; | |
1573 | } | |
1574 | fcoe_ethdrv_get(netdev); | |
1575 | ||
7f349142 | 1576 | rc = fcoe_if_create(netdev); |
85b4aa49 | 1577 | if (rc) { |
7f349142 | 1578 | printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n", |
85b4aa49 RL |
1579 | netdev->name); |
1580 | fcoe_ethdrv_put(netdev); | |
1581 | rc = -EIO; | |
1582 | goto out_putdev; | |
1583 | } | |
1584 | rc = 0; | |
1585 | out_putdev: | |
1586 | dev_put(netdev); | |
1587 | out_nodev: | |
1588 | return rc; | |
1589 | } | |
1590 | ||
1591 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1592 | __MODULE_PARM_TYPE(create, "string"); | |
1593 | MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); | |
1594 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); | |
1595 | __MODULE_PARM_TYPE(destroy, "string"); | |
1596 | MODULE_PARM_DESC(destroy, "Destroy fcoe port"); | |
1597 | ||
34f42a07 RL |
1598 | /** |
1599 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1600 | * @lp: ptr to the fc_lport |
1601 | * | |
1602 | * Any permanently-disqualifying conditions have been previously checked. | |
1603 | * This also updates the speed setting, which may change with link for 100/1000. | |
1604 | * | |
1605 | * This function should probably be checking for PAUSE support at some point | |
1606 | * in the future. Currently Per-priority-pause is not determinable using | |
1607 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1608 | * | |
1609 | * Returns: 0 if link is OK for use by FCoE. | |
1610 | * | |
1611 | */ | |
1612 | int fcoe_link_ok(struct fc_lport *lp) | |
1613 | { | |
fc47ff6b | 1614 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 RL |
1615 | struct net_device *dev = fc->real_dev; |
1616 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; | |
1617 | int rc = 0; | |
1618 | ||
1619 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) { | |
1620 | dev = fc->phys_dev; | |
1621 | if (dev->ethtool_ops->get_settings) { | |
1622 | dev->ethtool_ops->get_settings(dev, &ecmd); | |
1623 | lp->link_supported_speeds &= | |
1624 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1625 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1626 | SUPPORTED_1000baseT_Full)) | |
1627 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1628 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1629 | lp->link_supported_speeds |= | |
1630 | FC_PORTSPEED_10GBIT; | |
1631 | if (ecmd.speed == SPEED_1000) | |
1632 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1633 | if (ecmd.speed == SPEED_10000) | |
1634 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
1635 | } | |
1636 | } else | |
1637 | rc = -1; | |
1638 | ||
1639 | return rc; | |
1640 | } | |
85b4aa49 | 1641 | |
34f42a07 RL |
1642 | /** |
1643 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 RL |
1644 | * @lp: the fc_lport |
1645 | */ | |
1646 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1647 | { | |
85b4aa49 RL |
1648 | struct fcoe_percpu_s *pp; |
1649 | struct fcoe_rcv_info *fr; | |
1650 | struct sk_buff_head *list; | |
1651 | struct sk_buff *skb, *next; | |
1652 | struct sk_buff *head; | |
5e5e92df | 1653 | unsigned int cpu; |
85b4aa49 | 1654 | |
5e5e92df RL |
1655 | for_each_possible_cpu(cpu) { |
1656 | pp = &per_cpu(fcoe_percpu, cpu); | |
1657 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1658 | list = &pp->fcoe_rx_list; | |
1659 | head = list->next; | |
1660 | for (skb = head; skb != (struct sk_buff *)list; | |
1661 | skb = next) { | |
1662 | next = skb->next; | |
1663 | fr = fcoe_dev_from_skb(skb); | |
1664 | if (fr->fr_dev == lp) { | |
1665 | __skb_unlink(skb, list); | |
1666 | kfree_skb(skb); | |
85b4aa49 | 1667 | } |
85b4aa49 | 1668 | } |
5e5e92df | 1669 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
85b4aa49 RL |
1670 | } |
1671 | } | |
85b4aa49 RL |
1672 | |
1673 | /** | |
34f42a07 | 1674 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1675 | * @lp: the corresponding fc_lport |
1676 | * | |
1677 | * Returns: none | |
34f42a07 | 1678 | */ |
85b4aa49 RL |
1679 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1680 | { | |
1681 | struct fcoe_softc *fc = lport_priv(lp); | |
1682 | struct sk_buff *skb; | |
1683 | ||
1684 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1685 | while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { | |
1686 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1687 | kfree_skb(skb); | |
1688 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1689 | } | |
1690 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1691 | } | |
85b4aa49 | 1692 | |
34f42a07 RL |
1693 | /** |
1694 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
1695 | * @shost: shost the reset is from |
1696 | * | |
1697 | * Returns: always 0 | |
1698 | */ | |
1699 | int fcoe_reset(struct Scsi_Host *shost) | |
1700 | { | |
1701 | struct fc_lport *lport = shost_priv(shost); | |
1702 | fc_lport_reset(lport); | |
1703 | return 0; | |
1704 | } | |
85b4aa49 | 1705 | |
34f42a07 RL |
1706 | /** |
1707 | * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device | |
dd3fd72e | 1708 | * @dev: this is currently ptr to net_device |
85b4aa49 RL |
1709 | * |
1710 | * Returns: NULL or the located fcoe_softc | |
1711 | */ | |
b2ab99c9 RL |
1712 | static struct fcoe_softc * |
1713 | fcoe_hostlist_lookup_softc(const struct net_device *dev) | |
85b4aa49 RL |
1714 | { |
1715 | struct fcoe_softc *fc; | |
1716 | ||
1717 | read_lock(&fcoe_hostlist_lock); | |
1718 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1719 | if (fc->real_dev == dev) { | |
1720 | read_unlock(&fcoe_hostlist_lock); | |
1721 | return fc; | |
1722 | } | |
1723 | } | |
1724 | read_unlock(&fcoe_hostlist_lock); | |
1725 | return NULL; | |
1726 | } | |
1727 | ||
34f42a07 RL |
1728 | /** |
1729 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
1730 | * @netdev: ptr to net_device |
1731 | * | |
1732 | * Returns: 0 for success | |
1733 | */ | |
1734 | struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) | |
1735 | { | |
1736 | struct fcoe_softc *fc; | |
1737 | ||
1738 | fc = fcoe_hostlist_lookup_softc(netdev); | |
1739 | ||
97c8389d | 1740 | return (fc) ? fc->ctlr.lp : NULL; |
85b4aa49 | 1741 | } |
85b4aa49 | 1742 | |
34f42a07 RL |
1743 | /** |
1744 | * fcoe_hostlist_add() - Add a lport to lports list | |
dd3fd72e | 1745 | * @lp: ptr to the fc_lport to be added |
85b4aa49 RL |
1746 | * |
1747 | * Returns: 0 for success | |
1748 | */ | |
1749 | int fcoe_hostlist_add(const struct fc_lport *lp) | |
1750 | { | |
1751 | struct fcoe_softc *fc; | |
1752 | ||
1753 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1754 | if (!fc) { | |
fc47ff6b | 1755 | fc = lport_priv(lp); |
85b4aa49 RL |
1756 | write_lock_bh(&fcoe_hostlist_lock); |
1757 | list_add_tail(&fc->list, &fcoe_hostlist); | |
1758 | write_unlock_bh(&fcoe_hostlist_lock); | |
1759 | } | |
1760 | return 0; | |
1761 | } | |
85b4aa49 | 1762 | |
34f42a07 RL |
1763 | /** |
1764 | * fcoe_hostlist_remove() - remove a lport from lports list | |
dd3fd72e | 1765 | * @lp: ptr to the fc_lport to be removed |
85b4aa49 RL |
1766 | * |
1767 | * Returns: 0 for success | |
1768 | */ | |
1769 | int fcoe_hostlist_remove(const struct fc_lport *lp) | |
1770 | { | |
1771 | struct fcoe_softc *fc; | |
1772 | ||
1773 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1774 | BUG_ON(!fc); | |
1775 | write_lock_bh(&fcoe_hostlist_lock); | |
1776 | list_del(&fc->list); | |
1777 | write_unlock_bh(&fcoe_hostlist_lock); | |
1778 | ||
1779 | return 0; | |
1780 | } | |
85b4aa49 | 1781 | |
85b4aa49 | 1782 | /** |
34f42a07 | 1783 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 | 1784 | * |
85b4aa49 | 1785 | * Returns 0 on success, negative on failure |
34f42a07 | 1786 | */ |
85b4aa49 RL |
1787 | static int __init fcoe_init(void) |
1788 | { | |
38eccabd | 1789 | unsigned int cpu; |
8976f424 | 1790 | int rc = 0; |
85b4aa49 RL |
1791 | struct fcoe_percpu_s *p; |
1792 | ||
85b4aa49 RL |
1793 | INIT_LIST_HEAD(&fcoe_hostlist); |
1794 | rwlock_init(&fcoe_hostlist_lock); | |
1795 | ||
38eccabd | 1796 | for_each_possible_cpu(cpu) { |
5e5e92df | 1797 | p = &per_cpu(fcoe_percpu, cpu); |
38eccabd RL |
1798 | skb_queue_head_init(&p->fcoe_rx_list); |
1799 | } | |
1800 | ||
8976f424 RL |
1801 | for_each_online_cpu(cpu) |
1802 | fcoe_percpu_thread_create(cpu); | |
85b4aa49 | 1803 | |
8976f424 RL |
1804 | /* Initialize per CPU interrupt thread */ |
1805 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); | |
1806 | if (rc) | |
1807 | goto out_free; | |
85b4aa49 | 1808 | |
8976f424 | 1809 | /* Setup link change notification */ |
85b4aa49 RL |
1810 | fcoe_dev_setup(); |
1811 | ||
a468f328 RL |
1812 | setup_timer(&fcoe_timer, fcoe_watchdog, 0); |
1813 | ||
1814 | mod_timer(&fcoe_timer, jiffies + (10 * HZ)); | |
85b4aa49 | 1815 | |
7f349142 | 1816 | fcoe_if_init(); |
85b4aa49 RL |
1817 | |
1818 | return 0; | |
8976f424 RL |
1819 | |
1820 | out_free: | |
1821 | for_each_online_cpu(cpu) { | |
1822 | fcoe_percpu_thread_destroy(cpu); | |
1823 | } | |
1824 | ||
1825 | return rc; | |
85b4aa49 RL |
1826 | } |
1827 | module_init(fcoe_init); | |
1828 | ||
1829 | /** | |
34f42a07 | 1830 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
1831 | * |
1832 | * Returns 0 on success, negative on failure | |
34f42a07 | 1833 | */ |
85b4aa49 RL |
1834 | static void __exit fcoe_exit(void) |
1835 | { | |
5e5e92df | 1836 | unsigned int cpu; |
85b4aa49 | 1837 | struct fcoe_softc *fc, *tmp; |
85b4aa49 | 1838 | |
85b4aa49 RL |
1839 | fcoe_dev_cleanup(); |
1840 | ||
582b45bc | 1841 | /* Stop the timer */ |
85b4aa49 RL |
1842 | del_timer_sync(&fcoe_timer); |
1843 | ||
5919a595 | 1844 | /* releases the associated fcoe hosts */ |
85b4aa49 | 1845 | list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
7f349142 | 1846 | fcoe_if_destroy(fc->real_dev); |
85b4aa49 | 1847 | |
8976f424 RL |
1848 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
1849 | ||
1850 | for_each_online_cpu(cpu) { | |
1851 | fcoe_percpu_thread_destroy(cpu); | |
85b4aa49 RL |
1852 | } |
1853 | ||
7f349142 VD |
1854 | /* detach from scsi transport */ |
1855 | fcoe_if_exit(); | |
85b4aa49 RL |
1856 | } |
1857 | module_exit(fcoe_exit); |