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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 | ||
85b4aa49 | 74 | static int fcoe_check_wait_queue(struct fc_lport *); |
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; | |
149 | lp->e_d_tov = 2 * 1000; /* FC-FS default */ | |
150 | lp->r_a_tov = 2 * 2 * 1000; | |
151 | lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | | |
152 | FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); | |
153 | ||
154 | fc_lport_init_stats(lp); | |
155 | ||
156 | /* lport fc_lport related configuration */ | |
157 | fc_lport_config(lp); | |
158 | ||
159 | /* offload related configuration */ | |
160 | lp->crc_offload = 0; | |
161 | lp->seq_offload = 0; | |
162 | lp->lro_enabled = 0; | |
163 | lp->lro_xid = 0; | |
164 | lp->lso_max = 0; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | /** | |
170 | * fcoe_netdev_config() - Set up netdev for SW FCoE | |
171 | * @lp : ptr to the fc_lport | |
172 | * @netdev : ptr to the associated netdevice struct | |
173 | * | |
174 | * Must be called after fcoe_lport_config() as it will use lport mutex | |
175 | * | |
176 | * Returns : 0 for success | |
177 | */ | |
178 | static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) | |
179 | { | |
180 | u32 mfs; | |
181 | u64 wwnn, wwpn; | |
182 | struct fcoe_softc *fc; | |
183 | u8 flogi_maddr[ETH_ALEN]; | |
184 | ||
185 | /* Setup lport private data to point to fcoe softc */ | |
186 | fc = lport_priv(lp); | |
97c8389d | 187 | fc->ctlr.lp = lp; |
7f349142 VD |
188 | fc->real_dev = netdev; |
189 | fc->phys_dev = netdev; | |
190 | ||
191 | /* Require support for get_pauseparam ethtool op. */ | |
192 | if (netdev->priv_flags & IFF_802_1Q_VLAN) | |
193 | fc->phys_dev = vlan_dev_real_dev(netdev); | |
194 | ||
195 | /* Do not support for bonding device */ | |
196 | if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) || | |
197 | (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) || | |
198 | (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) { | |
199 | return -EOPNOTSUPP; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Determine max frame size based on underlying device and optional | |
204 | * user-configured limit. If the MFS is too low, fcoe_link_ok() | |
205 | * will return 0, so do this first. | |
206 | */ | |
207 | mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) + | |
208 | sizeof(struct fcoe_crc_eof)); | |
209 | if (fc_set_mfs(lp, mfs)) | |
210 | return -EINVAL; | |
211 | ||
7f349142 VD |
212 | /* offload features support */ |
213 | if (fc->real_dev->features & NETIF_F_SG) | |
214 | lp->sg_supp = 1; | |
215 | ||
216 | #ifdef NETIF_F_FCOE_CRC | |
217 | if (netdev->features & NETIF_F_FCOE_CRC) { | |
218 | lp->crc_offload = 1; | |
219 | printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n", | |
220 | netdev->name); | |
221 | } | |
222 | #endif | |
223 | #ifdef NETIF_F_FSO | |
224 | if (netdev->features & NETIF_F_FSO) { | |
225 | lp->seq_offload = 1; | |
226 | lp->lso_max = netdev->gso_max_size; | |
227 | printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n", | |
228 | netdev->name, lp->lso_max); | |
229 | } | |
230 | #endif | |
231 | if (netdev->fcoe_ddp_xid) { | |
232 | lp->lro_enabled = 1; | |
233 | lp->lro_xid = netdev->fcoe_ddp_xid; | |
234 | printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n", | |
235 | netdev->name, lp->lro_xid); | |
236 | } | |
237 | skb_queue_head_init(&fc->fcoe_pending_queue); | |
238 | fc->fcoe_pending_queue_active = 0; | |
239 | ||
240 | /* setup Source Mac Address */ | |
97c8389d | 241 | memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr, |
7f349142 VD |
242 | fc->real_dev->addr_len); |
243 | ||
244 | wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0); | |
245 | fc_set_wwnn(lp, wwnn); | |
246 | /* XXX - 3rd arg needs to be vlan id */ | |
247 | wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0); | |
248 | fc_set_wwpn(lp, wwpn); | |
249 | ||
250 | /* | |
251 | * Add FCoE MAC address as second unicast MAC address | |
252 | * or enter promiscuous mode if not capable of listening | |
253 | * for multiple unicast MACs. | |
254 | */ | |
255 | rtnl_lock(); | |
256 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
257 | dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN); | |
6401bdca | 258 | dev_mc_add(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); |
7f349142 VD |
259 | rtnl_unlock(); |
260 | ||
261 | /* | |
262 | * setup the receive function from ethernet driver | |
263 | * on the ethertype for the given device | |
264 | */ | |
265 | fc->fcoe_packet_type.func = fcoe_rcv; | |
266 | fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); | |
267 | fc->fcoe_packet_type.dev = fc->real_dev; | |
268 | dev_add_pack(&fc->fcoe_packet_type); | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | /** | |
274 | * fcoe_shost_config() - Sets up fc_lport->host | |
275 | * @lp : ptr to the fc_lport | |
276 | * @shost : ptr to the associated scsi host | |
277 | * @dev : device associated to scsi host | |
278 | * | |
279 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() | |
280 | * | |
281 | * Returns : 0 for success | |
282 | */ | |
283 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, | |
284 | struct device *dev) | |
285 | { | |
286 | int rc = 0; | |
287 | ||
288 | /* lport scsi host config */ | |
289 | lp->host = shost; | |
290 | ||
291 | lp->host->max_lun = FCOE_MAX_LUN; | |
292 | lp->host->max_id = FCOE_MAX_FCP_TARGET; | |
293 | lp->host->max_channel = 0; | |
294 | lp->host->transportt = scsi_transport_fcoe_sw; | |
295 | ||
296 | /* add the new host to the SCSI-ml */ | |
297 | rc = scsi_add_host(lp->host, dev); | |
298 | if (rc) { | |
299 | FC_DBG("fcoe_shost_config:error on scsi_add_host\n"); | |
300 | return rc; | |
301 | } | |
302 | sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", | |
303 | FCOE_NAME, FCOE_VERSION, | |
304 | fcoe_netdev(lp)->name); | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | /** | |
310 | * fcoe_em_config() - allocates em for this lport | |
311 | * @lp: the port that em is to allocated for | |
312 | * | |
313 | * Returns : 0 on success | |
314 | */ | |
315 | static inline int fcoe_em_config(struct fc_lport *lp) | |
316 | { | |
317 | BUG_ON(lp->emp); | |
318 | ||
319 | lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3, | |
320 | FCOE_MIN_XID, FCOE_MAX_XID); | |
321 | if (!lp->emp) | |
322 | return -ENOMEM; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | /** | |
328 | * fcoe_if_destroy() - FCoE software HBA tear-down function | |
329 | * @netdev: ptr to the associated net_device | |
330 | * | |
331 | * Returns: 0 if link is OK for use by FCoE. | |
332 | */ | |
333 | static int fcoe_if_destroy(struct net_device *netdev) | |
334 | { | |
335 | struct fc_lport *lp = NULL; | |
336 | struct fcoe_softc *fc; | |
337 | u8 flogi_maddr[ETH_ALEN]; | |
338 | ||
339 | BUG_ON(!netdev); | |
340 | ||
341 | printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n", | |
342 | netdev->name); | |
343 | ||
344 | lp = fcoe_hostlist_lookup(netdev); | |
345 | if (!lp) | |
346 | return -ENODEV; | |
347 | ||
348 | fc = lport_priv(lp); | |
349 | ||
350 | /* Logout of the fabric */ | |
351 | fc_fabric_logoff(lp); | |
352 | ||
353 | /* Remove the instance from fcoe's list */ | |
354 | fcoe_hostlist_remove(lp); | |
355 | ||
356 | /* Don't listen for Ethernet packets anymore */ | |
357 | dev_remove_pack(&fc->fcoe_packet_type); | |
97c8389d JE |
358 | dev_remove_pack(&fc->fip_packet_type); |
359 | fcoe_ctlr_destroy(&fc->ctlr); | |
7f349142 VD |
360 | |
361 | /* Cleanup the fc_lport */ | |
362 | fc_lport_destroy(lp); | |
363 | fc_fcp_destroy(lp); | |
364 | ||
365 | /* Detach from the scsi-ml */ | |
366 | fc_remove_host(lp->host); | |
367 | scsi_remove_host(lp->host); | |
368 | ||
369 | /* There are no more rports or I/O, free the EM */ | |
370 | if (lp->emp) | |
371 | fc_exch_mgr_free(lp->emp); | |
372 | ||
373 | /* Delete secondary MAC addresses */ | |
374 | rtnl_lock(); | |
375 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
376 | dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN); | |
97c8389d JE |
377 | if (!is_zero_ether_addr(fc->ctlr.data_src_addr)) |
378 | dev_unicast_delete(fc->real_dev, | |
379 | fc->ctlr.data_src_addr, ETH_ALEN); | |
380 | dev_mc_delete(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); | |
7f349142 VD |
381 | rtnl_unlock(); |
382 | ||
dd3fd72e | 383 | /* Free the per-CPU receive threads */ |
7f349142 VD |
384 | fcoe_percpu_clean(lp); |
385 | ||
386 | /* Free existing skbs */ | |
387 | fcoe_clean_pending_queue(lp); | |
388 | ||
389 | /* Free memory used by statistical counters */ | |
390 | fc_lport_free_stats(lp); | |
391 | ||
392 | /* Release the net_device and Scsi_Host */ | |
393 | dev_put(fc->real_dev); | |
394 | scsi_host_put(lp->host); | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | /* | |
400 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device | |
401 | * @lp: the corresponding fc_lport | |
402 | * @xid: the exchange id for this ddp transfer | |
403 | * @sgl: the scatterlist describing this transfer | |
404 | * @sgc: number of sg items | |
405 | * | |
406 | * Returns : 0 no ddp | |
407 | */ | |
408 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, | |
409 | struct scatterlist *sgl, unsigned int sgc) | |
410 | { | |
411 | struct net_device *n = fcoe_netdev(lp); | |
412 | ||
413 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup) | |
414 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | /* | |
420 | * fcoe_ddp_done - calls LLD's ddp_done through net_device | |
421 | * @lp: the corresponding fc_lport | |
422 | * @xid: the exchange id for this ddp transfer | |
423 | * | |
424 | * Returns : the length of data that have been completed by ddp | |
425 | */ | |
426 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) | |
427 | { | |
428 | struct net_device *n = fcoe_netdev(lp); | |
429 | ||
430 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done) | |
431 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | static struct libfc_function_template fcoe_libfc_fcn_templ = { | |
436 | .frame_send = fcoe_xmit, | |
437 | .ddp_setup = fcoe_ddp_setup, | |
438 | .ddp_done = fcoe_ddp_done, | |
439 | }; | |
440 | ||
97c8389d JE |
441 | /** |
442 | * fcoe_fip_recv - handle a received FIP frame. | |
443 | * @skb: the receive skb | |
444 | * @dev: associated &net_device | |
445 | * @ptype: the &packet_type structure which was used to register this handler. | |
446 | * @orig_dev: original receive &net_device, in case @dev is a bond. | |
447 | * | |
448 | * Returns: 0 for success | |
449 | */ | |
450 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, | |
451 | struct packet_type *ptype, | |
452 | struct net_device *orig_dev) | |
453 | { | |
454 | struct fcoe_softc *fc; | |
455 | ||
456 | fc = container_of(ptype, struct fcoe_softc, fip_packet_type); | |
457 | fcoe_ctlr_recv(&fc->ctlr, skb); | |
458 | return 0; | |
459 | } | |
460 | ||
461 | /** | |
462 | * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame. | |
463 | * @fip: FCoE controller. | |
464 | * @skb: FIP Packet. | |
465 | */ | |
466 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
467 | { | |
468 | skb->dev = fcoe_from_ctlr(fip)->real_dev; | |
469 | dev_queue_xmit(skb); | |
470 | } | |
471 | ||
472 | /** | |
473 | * fcoe_update_src_mac() - Update Ethernet MAC filters. | |
474 | * @fip: FCoE controller. | |
475 | * @old: Unicast MAC address to delete if the MAC is non-zero. | |
476 | * @new: Unicast MAC address to add. | |
477 | * | |
478 | * Remove any previously-set unicast MAC filter. | |
479 | * Add secondary FCoE MAC address filter for our OUI. | |
480 | */ | |
481 | static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new) | |
482 | { | |
483 | struct fcoe_softc *fc; | |
484 | ||
485 | fc = fcoe_from_ctlr(fip); | |
486 | rtnl_lock(); | |
487 | if (!is_zero_ether_addr(old)) | |
488 | dev_unicast_delete(fc->real_dev, old, ETH_ALEN); | |
489 | dev_unicast_add(fc->real_dev, new, ETH_ALEN); | |
490 | rtnl_unlock(); | |
491 | } | |
492 | ||
7f349142 VD |
493 | /** |
494 | * fcoe_if_create() - this function creates the fcoe interface | |
495 | * @netdev: pointer the associated netdevice | |
496 | * | |
497 | * Creates fc_lport struct and scsi_host for lport, configures lport | |
498 | * and starts fabric login. | |
499 | * | |
500 | * Returns : 0 on success | |
501 | */ | |
502 | static int fcoe_if_create(struct net_device *netdev) | |
503 | { | |
504 | int rc; | |
505 | struct fc_lport *lp = NULL; | |
506 | struct fcoe_softc *fc; | |
507 | struct Scsi_Host *shost; | |
508 | ||
509 | BUG_ON(!netdev); | |
510 | ||
511 | printk(KERN_DEBUG "fcoe_if_create:interface on %s\n", | |
512 | netdev->name); | |
513 | ||
514 | lp = fcoe_hostlist_lookup(netdev); | |
515 | if (lp) | |
516 | return -EEXIST; | |
517 | ||
a0a25da2 VD |
518 | shost = libfc_host_alloc(&fcoe_shost_template, |
519 | sizeof(struct fcoe_softc)); | |
7f349142 VD |
520 | if (!shost) { |
521 | FC_DBG("Could not allocate host structure\n"); | |
522 | return -ENOMEM; | |
523 | } | |
524 | lp = shost_priv(shost); | |
525 | fc = lport_priv(lp); | |
526 | ||
527 | /* configure fc_lport, e.g., em */ | |
528 | rc = fcoe_lport_config(lp); | |
529 | if (rc) { | |
530 | FC_DBG("Could not configure lport\n"); | |
531 | goto out_host_put; | |
532 | } | |
533 | ||
534 | /* configure lport network properties */ | |
535 | rc = fcoe_netdev_config(lp, netdev); | |
536 | if (rc) { | |
537 | FC_DBG("Could not configure netdev for lport\n"); | |
538 | goto out_host_put; | |
539 | } | |
540 | ||
97c8389d JE |
541 | /* |
542 | * Initialize FIP. | |
543 | */ | |
544 | fcoe_ctlr_init(&fc->ctlr); | |
545 | fc->ctlr.send = fcoe_fip_send; | |
546 | fc->ctlr.update_mac = fcoe_update_src_mac; | |
547 | ||
548 | fc->fip_packet_type.func = fcoe_fip_recv; | |
549 | fc->fip_packet_type.type = htons(ETH_P_FIP); | |
550 | fc->fip_packet_type.dev = fc->real_dev; | |
551 | dev_add_pack(&fc->fip_packet_type); | |
552 | ||
7f349142 VD |
553 | /* configure lport scsi host properties */ |
554 | rc = fcoe_shost_config(lp, shost, &netdev->dev); | |
555 | if (rc) { | |
556 | FC_DBG("Could not configure shost for lport\n"); | |
557 | goto out_host_put; | |
558 | } | |
559 | ||
560 | /* lport exch manager allocation */ | |
561 | rc = fcoe_em_config(lp); | |
562 | if (rc) { | |
563 | FC_DBG("Could not configure em for lport\n"); | |
564 | goto out_host_put; | |
565 | } | |
566 | ||
567 | /* Initialize the library */ | |
568 | rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ); | |
569 | if (rc) { | |
570 | FC_DBG("Could not configure libfc for lport!\n"); | |
571 | goto out_lp_destroy; | |
572 | } | |
573 | ||
574 | /* add to lports list */ | |
575 | fcoe_hostlist_add(lp); | |
576 | ||
577 | lp->boot_time = jiffies; | |
578 | ||
579 | fc_fabric_login(lp); | |
580 | ||
97c8389d JE |
581 | if (!fcoe_link_ok(lp)) |
582 | fcoe_ctlr_link_up(&fc->ctlr); | |
583 | ||
7f349142 VD |
584 | dev_hold(netdev); |
585 | ||
586 | return rc; | |
587 | ||
588 | out_lp_destroy: | |
589 | fc_exch_mgr_free(lp->emp); /* Free the EM */ | |
590 | out_host_put: | |
591 | scsi_host_put(lp->host); | |
592 | return rc; | |
593 | } | |
594 | ||
595 | /** | |
596 | * fcoe_if_init() - attach to scsi transport | |
597 | * | |
598 | * Returns : 0 on success | |
599 | */ | |
600 | static int __init fcoe_if_init(void) | |
601 | { | |
602 | /* attach to scsi transport */ | |
603 | scsi_transport_fcoe_sw = | |
604 | fc_attach_transport(&fcoe_transport_function); | |
605 | ||
606 | if (!scsi_transport_fcoe_sw) { | |
607 | printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n"); | |
608 | return -ENODEV; | |
609 | } | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | /** | |
615 | * fcoe_if_exit() - detach from scsi transport | |
616 | * | |
617 | * Returns : 0 on success | |
618 | */ | |
619 | int __exit fcoe_if_exit(void) | |
620 | { | |
621 | fc_release_transport(scsi_transport_fcoe_sw); | |
622 | return 0; | |
623 | } | |
624 | ||
8976f424 RL |
625 | /** |
626 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu | |
627 | * @cpu: cpu index for the online cpu | |
628 | */ | |
629 | static void fcoe_percpu_thread_create(unsigned int cpu) | |
630 | { | |
631 | struct fcoe_percpu_s *p; | |
632 | struct task_struct *thread; | |
633 | ||
634 | p = &per_cpu(fcoe_percpu, cpu); | |
635 | ||
636 | thread = kthread_create(fcoe_percpu_receive_thread, | |
637 | (void *)p, "fcoethread/%d", cpu); | |
638 | ||
639 | if (likely(!IS_ERR(p->thread))) { | |
640 | kthread_bind(thread, cpu); | |
641 | wake_up_process(thread); | |
642 | ||
643 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
644 | p->thread = thread; | |
645 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
646 | } | |
647 | } | |
648 | ||
649 | /** | |
650 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu | |
651 | * @cpu: cpu index the rx thread is to be removed | |
652 | * | |
653 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the | |
654 | * current CPU's Rx thread. If the thread being destroyed is bound to | |
655 | * the CPU processing this context the skbs will be freed. | |
656 | */ | |
657 | static void fcoe_percpu_thread_destroy(unsigned int cpu) | |
658 | { | |
659 | struct fcoe_percpu_s *p; | |
660 | struct task_struct *thread; | |
661 | struct page *crc_eof; | |
662 | struct sk_buff *skb; | |
663 | #ifdef CONFIG_SMP | |
664 | struct fcoe_percpu_s *p0; | |
665 | unsigned targ_cpu = smp_processor_id(); | |
666 | #endif /* CONFIG_SMP */ | |
667 | ||
668 | printk(KERN_DEBUG "fcoe: Destroying receive thread for CPU %d\n", cpu); | |
669 | ||
670 | /* Prevent any new skbs from being queued for this CPU. */ | |
671 | p = &per_cpu(fcoe_percpu, cpu); | |
672 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
673 | thread = p->thread; | |
674 | p->thread = NULL; | |
675 | crc_eof = p->crc_eof_page; | |
676 | p->crc_eof_page = NULL; | |
677 | p->crc_eof_offset = 0; | |
678 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
679 | ||
680 | #ifdef CONFIG_SMP | |
681 | /* | |
682 | * Don't bother moving the skb's if this context is running | |
683 | * on the same CPU that is having its thread destroyed. This | |
684 | * can easily happen when the module is removed. | |
685 | */ | |
686 | if (cpu != targ_cpu) { | |
687 | p0 = &per_cpu(fcoe_percpu, targ_cpu); | |
688 | spin_lock_bh(&p0->fcoe_rx_list.lock); | |
689 | if (p0->thread) { | |
690 | FC_DBG("Moving frames from CPU %d to CPU %d\n", | |
691 | cpu, targ_cpu); | |
692 | ||
693 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
694 | __skb_queue_tail(&p0->fcoe_rx_list, skb); | |
695 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
696 | } else { | |
697 | /* | |
698 | * The targeted CPU is not initialized and cannot accept | |
699 | * new skbs. Unlock the targeted CPU and drop the skbs | |
700 | * on the CPU that is going offline. | |
701 | */ | |
702 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
703 | kfree_skb(skb); | |
704 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
705 | } | |
706 | } else { | |
707 | /* | |
708 | * This scenario occurs when the module is being removed | |
709 | * and all threads are being destroyed. skbs will continue | |
710 | * to be shifted from the CPU thread that is being removed | |
711 | * to the CPU thread associated with the CPU that is processing | |
712 | * the module removal. Once there is only one CPU Rx thread it | |
713 | * will reach this case and we will drop all skbs and later | |
714 | * stop the thread. | |
715 | */ | |
716 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
717 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
718 | kfree_skb(skb); | |
719 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
720 | } | |
721 | #else | |
722 | /* | |
dd3fd72e | 723 | * This a non-SMP scenario where the singular Rx thread is |
8976f424 RL |
724 | * being removed. Free all skbs and stop the thread. |
725 | */ | |
726 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
727 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
728 | kfree_skb(skb); | |
729 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
730 | #endif | |
731 | ||
732 | if (thread) | |
733 | kthread_stop(thread); | |
734 | ||
735 | if (crc_eof) | |
736 | put_page(crc_eof); | |
737 | } | |
738 | ||
739 | /** | |
740 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback | |
741 | * @nfb: callback data block | |
742 | * @action: event triggering the callback | |
743 | * @hcpu: index for the cpu of this event | |
744 | * | |
745 | * This creates or destroys per cpu data for fcoe | |
746 | * | |
747 | * Returns NOTIFY_OK always. | |
748 | */ | |
749 | static int fcoe_cpu_callback(struct notifier_block *nfb, | |
750 | unsigned long action, void *hcpu) | |
751 | { | |
752 | unsigned cpu = (unsigned long)hcpu; | |
753 | ||
754 | switch (action) { | |
755 | case CPU_ONLINE: | |
756 | case CPU_ONLINE_FROZEN: | |
757 | FC_DBG("CPU %x online: Create Rx thread\n", cpu); | |
758 | fcoe_percpu_thread_create(cpu); | |
759 | break; | |
760 | case CPU_DEAD: | |
761 | case CPU_DEAD_FROZEN: | |
762 | FC_DBG("CPU %x offline: Remove Rx thread\n", cpu); | |
763 | fcoe_percpu_thread_destroy(cpu); | |
764 | break; | |
765 | default: | |
766 | break; | |
767 | } | |
768 | return NOTIFY_OK; | |
769 | } | |
770 | ||
771 | static struct notifier_block fcoe_cpu_notifier = { | |
772 | .notifier_call = fcoe_cpu_callback, | |
773 | }; | |
774 | ||
85b4aa49 | 775 | /** |
34f42a07 | 776 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
777 | * @skb: the receive skb |
778 | * @dev: associated net device | |
779 | * @ptype: context | |
dd3fd72e | 780 | * @olddev: last device |
85b4aa49 RL |
781 | * |
782 | * this function will receive the packet and build fc frame and pass it up | |
783 | * | |
784 | * Returns: 0 for success | |
34f42a07 | 785 | */ |
85b4aa49 RL |
786 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
787 | struct packet_type *ptype, struct net_device *olddev) | |
788 | { | |
789 | struct fc_lport *lp; | |
790 | struct fcoe_rcv_info *fr; | |
791 | struct fcoe_softc *fc; | |
85b4aa49 | 792 | struct fc_frame_header *fh; |
85b4aa49 | 793 | struct fcoe_percpu_s *fps; |
38eccabd | 794 | unsigned short oxid; |
8976f424 | 795 | unsigned int cpu = 0; |
85b4aa49 RL |
796 | |
797 | fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); | |
97c8389d | 798 | lp = fc->ctlr.lp; |
85b4aa49 RL |
799 | if (unlikely(lp == NULL)) { |
800 | FC_DBG("cannot find hba structure"); | |
801 | goto err2; | |
802 | } | |
97c8389d JE |
803 | if (!lp->link_up) |
804 | goto err2; | |
85b4aa49 RL |
805 | |
806 | if (unlikely(debug_fcoe)) { | |
807 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p " | |
808 | "end:%p sum:%d dev:%s", skb->len, skb->data_len, | |
809 | skb->head, skb->data, skb_tail_pointer(skb), | |
810 | skb_end_pointer(skb), skb->csum, | |
811 | skb->dev ? skb->dev->name : "<NULL>"); | |
812 | ||
813 | } | |
814 | ||
815 | /* check for FCOE packet type */ | |
816 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
817 | FC_DBG("wrong FC type frame"); | |
818 | goto err; | |
819 | } | |
820 | ||
821 | /* | |
822 | * Check for minimum frame length, and make sure required FCoE | |
823 | * and FC headers are pulled into the linear data area. | |
824 | */ | |
825 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
826 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
827 | goto err; | |
828 | ||
829 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
830 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
831 | ||
832 | oxid = ntohs(fh->fh_ox_id); | |
833 | ||
834 | fr = fcoe_dev_from_skb(skb); | |
835 | fr->fr_dev = lp; | |
836 | fr->ptype = ptype; | |
5e5e92df | 837 | |
85b4aa49 RL |
838 | #ifdef CONFIG_SMP |
839 | /* | |
840 | * The incoming frame exchange id(oxid) is ANDed with num of online | |
8976f424 RL |
841 | * cpu bits to get cpu and then this cpu is used for selecting |
842 | * a per cpu kernel thread from fcoe_percpu. | |
85b4aa49 | 843 | */ |
8976f424 | 844 | cpu = oxid & (num_online_cpus() - 1); |
85b4aa49 | 845 | #endif |
5e5e92df | 846 | |
8976f424 | 847 | fps = &per_cpu(fcoe_percpu, cpu); |
85b4aa49 | 848 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
8976f424 RL |
849 | if (unlikely(!fps->thread)) { |
850 | /* | |
851 | * The targeted CPU is not ready, let's target | |
852 | * the first CPU now. For non-SMP systems this | |
853 | * will check the same CPU twice. | |
854 | */ | |
855 | FC_DBG("CPU is online, but no receive thread ready " | |
856 | "for incoming skb- using first online CPU.\n"); | |
857 | ||
858 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
859 | cpu = first_cpu(cpu_online_map); | |
860 | fps = &per_cpu(fcoe_percpu, cpu); | |
861 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
862 | if (!fps->thread) { | |
863 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
864 | goto err; | |
865 | } | |
866 | } | |
867 | ||
868 | /* | |
869 | * We now have a valid CPU that we're targeting for | |
870 | * this skb. We also have this receive thread locked, | |
871 | * so we're free to queue skbs into it's queue. | |
872 | */ | |
85b4aa49 RL |
873 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
874 | if (fps->fcoe_rx_list.qlen == 1) | |
875 | wake_up_process(fps->thread); | |
876 | ||
877 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
878 | ||
879 | return 0; | |
880 | err: | |
582b45bc | 881 | fc_lport_get_stats(lp)->ErrorFrames++; |
85b4aa49 RL |
882 | |
883 | err2: | |
884 | kfree_skb(skb); | |
885 | return -1; | |
886 | } | |
85b4aa49 RL |
887 | |
888 | /** | |
34f42a07 | 889 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
890 | * @skb: the skb to be xmitted |
891 | * | |
892 | * Returns: 0 for success | |
34f42a07 | 893 | */ |
85b4aa49 RL |
894 | static inline int fcoe_start_io(struct sk_buff *skb) |
895 | { | |
896 | int rc; | |
897 | ||
898 | skb_get(skb); | |
899 | rc = dev_queue_xmit(skb); | |
900 | if (rc != 0) | |
901 | return rc; | |
902 | kfree_skb(skb); | |
903 | return 0; | |
904 | } | |
905 | ||
906 | /** | |
dd3fd72e | 907 | * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof |
85b4aa49 RL |
908 | * @skb: the skb to be xmitted |
909 | * @tlen: total len | |
910 | * | |
911 | * Returns: 0 for success | |
34f42a07 | 912 | */ |
85b4aa49 RL |
913 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
914 | { | |
915 | struct fcoe_percpu_s *fps; | |
916 | struct page *page; | |
85b4aa49 | 917 | |
5e5e92df | 918 | fps = &get_cpu_var(fcoe_percpu); |
85b4aa49 RL |
919 | page = fps->crc_eof_page; |
920 | if (!page) { | |
921 | page = alloc_page(GFP_ATOMIC); | |
922 | if (!page) { | |
5e5e92df | 923 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
924 | return -ENOMEM; |
925 | } | |
926 | fps->crc_eof_page = page; | |
8976f424 | 927 | fps->crc_eof_offset = 0; |
85b4aa49 RL |
928 | } |
929 | ||
930 | get_page(page); | |
931 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
932 | fps->crc_eof_offset, tlen); | |
933 | skb->len += tlen; | |
934 | skb->data_len += tlen; | |
935 | skb->truesize += tlen; | |
936 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
937 | ||
938 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
939 | fps->crc_eof_page = NULL; | |
940 | fps->crc_eof_offset = 0; | |
941 | put_page(page); | |
942 | } | |
5e5e92df | 943 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
944 | return 0; |
945 | } | |
946 | ||
947 | /** | |
34f42a07 | 948 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
dd3fd72e | 949 | * @fp: the fc_frame containing data to be checksummed |
85b4aa49 RL |
950 | * |
951 | * This uses crc32() to calculate the crc for fc frame | |
952 | * Return : 32 bit crc | |
34f42a07 | 953 | */ |
85b4aa49 RL |
954 | u32 fcoe_fc_crc(struct fc_frame *fp) |
955 | { | |
956 | struct sk_buff *skb = fp_skb(fp); | |
957 | struct skb_frag_struct *frag; | |
958 | unsigned char *data; | |
959 | unsigned long off, len, clen; | |
960 | u32 crc; | |
961 | unsigned i; | |
962 | ||
963 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
964 | ||
965 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
966 | frag = &skb_shinfo(skb)->frags[i]; | |
967 | off = frag->page_offset; | |
968 | len = frag->size; | |
969 | while (len > 0) { | |
970 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
971 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
972 | KM_SKB_DATA_SOFTIRQ); | |
973 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
974 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
975 | off += clen; | |
976 | len -= clen; | |
977 | } | |
978 | } | |
979 | return crc; | |
980 | } | |
85b4aa49 RL |
981 | |
982 | /** | |
34f42a07 | 983 | * fcoe_xmit() - FCoE frame transmit function |
85b4aa49 RL |
984 | * @lp: the associated local port |
985 | * @fp: the fc_frame to be transmitted | |
986 | * | |
987 | * Return : 0 for success | |
34f42a07 | 988 | */ |
85b4aa49 RL |
989 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
990 | { | |
991 | int wlen, rc = 0; | |
992 | u32 crc; | |
993 | struct ethhdr *eh; | |
994 | struct fcoe_crc_eof *cp; | |
995 | struct sk_buff *skb; | |
996 | struct fcoe_dev_stats *stats; | |
997 | struct fc_frame_header *fh; | |
998 | unsigned int hlen; /* header length implies the version */ | |
999 | unsigned int tlen; /* trailer length */ | |
1000 | unsigned int elen; /* eth header, may include vlan */ | |
85b4aa49 RL |
1001 | struct fcoe_softc *fc; |
1002 | u8 sof, eof; | |
1003 | struct fcoe_hdr *hp; | |
1004 | ||
1005 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
1006 | ||
fc47ff6b | 1007 | fc = lport_priv(lp); |
85b4aa49 | 1008 | fh = fc_frame_header_get(fp); |
97c8389d JE |
1009 | skb = fp_skb(fp); |
1010 | wlen = skb->len / FCOE_WORD_TO_BYTE; | |
1011 | ||
1012 | if (!lp->link_up) { | |
3caf02ee | 1013 | kfree_skb(skb); |
97c8389d | 1014 | return 0; |
85b4aa49 RL |
1015 | } |
1016 | ||
97c8389d JE |
1017 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) && |
1018 | fcoe_ctlr_els_send(&fc->ctlr, skb)) | |
1019 | return 0; | |
1020 | ||
85b4aa49 RL |
1021 | sof = fr_sof(fp); |
1022 | eof = fr_eof(fp); | |
1023 | ||
1024 | elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ? | |
1025 | sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr); | |
1026 | hlen = sizeof(struct fcoe_hdr); | |
1027 | tlen = sizeof(struct fcoe_crc_eof); | |
1028 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
1029 | ||
1030 | /* crc offload */ | |
1031 | if (likely(lp->crc_offload)) { | |
39ca9a06 | 1032 | skb->ip_summed = CHECKSUM_PARTIAL; |
85b4aa49 RL |
1033 | skb->csum_start = skb_headroom(skb); |
1034 | skb->csum_offset = skb->len; | |
1035 | crc = 0; | |
1036 | } else { | |
1037 | skb->ip_summed = CHECKSUM_NONE; | |
1038 | crc = fcoe_fc_crc(fp); | |
1039 | } | |
1040 | ||
1041 | /* copy fc crc and eof to the skb buff */ | |
1042 | if (skb_is_nonlinear(skb)) { | |
1043 | skb_frag_t *frag; | |
1044 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 1045 | kfree_skb(skb); |
85b4aa49 RL |
1046 | return -ENOMEM; |
1047 | } | |
1048 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
1049 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
1050 | + frag->page_offset; | |
1051 | } else { | |
1052 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
1053 | } | |
1054 | ||
1055 | memset(cp, 0, sizeof(*cp)); | |
1056 | cp->fcoe_eof = eof; | |
1057 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
1058 | ||
1059 | if (skb_is_nonlinear(skb)) { | |
1060 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
1061 | cp = NULL; | |
1062 | } | |
1063 | ||
dd3fd72e | 1064 | /* adjust skb network/transport offsets to match mac/fcoe/fc */ |
85b4aa49 RL |
1065 | skb_push(skb, elen + hlen); |
1066 | skb_reset_mac_header(skb); | |
1067 | skb_reset_network_header(skb); | |
1068 | skb->mac_len = elen; | |
211c738d | 1069 | skb->protocol = htons(ETH_P_FCOE); |
85b4aa49 RL |
1070 | skb->dev = fc->real_dev; |
1071 | ||
1072 | /* fill up mac and fcoe headers */ | |
1073 | eh = eth_hdr(skb); | |
1074 | eh->h_proto = htons(ETH_P_FCOE); | |
97c8389d | 1075 | if (fc->ctlr.map_dest) |
85b4aa49 RL |
1076 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); |
1077 | else | |
1078 | /* insert GW address */ | |
97c8389d | 1079 | memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN); |
85b4aa49 | 1080 | |
97c8389d JE |
1081 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
1082 | memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN); | |
85b4aa49 | 1083 | else |
97c8389d | 1084 | memcpy(eh->h_source, fc->ctlr.data_src_addr, ETH_ALEN); |
85b4aa49 RL |
1085 | |
1086 | hp = (struct fcoe_hdr *)(eh + 1); | |
1087 | memset(hp, 0, sizeof(*hp)); | |
1088 | if (FC_FCOE_VER) | |
1089 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
1090 | hp->fcoe_sof = sof; | |
1091 | ||
39ca9a06 YZ |
1092 | #ifdef NETIF_F_FSO |
1093 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ | |
1094 | if (lp->seq_offload && fr_max_payload(fp)) { | |
1095 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; | |
1096 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); | |
1097 | } else { | |
1098 | skb_shinfo(skb)->gso_type = 0; | |
1099 | skb_shinfo(skb)->gso_size = 0; | |
1100 | } | |
1101 | #endif | |
85b4aa49 | 1102 | /* update tx stats: regardless if LLD fails */ |
582b45bc RL |
1103 | stats = fc_lport_get_stats(lp); |
1104 | stats->TxFrames++; | |
1105 | stats->TxWords += wlen; | |
85b4aa49 RL |
1106 | |
1107 | /* send down to lld */ | |
1108 | fr_dev(fp) = lp; | |
1109 | if (fc->fcoe_pending_queue.qlen) | |
1110 | rc = fcoe_check_wait_queue(lp); | |
1111 | ||
1112 | if (rc == 0) | |
1113 | rc = fcoe_start_io(skb); | |
1114 | ||
1115 | if (rc) { | |
55c8bafb CL |
1116 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
1117 | __skb_queue_tail(&fc->fcoe_pending_queue, skb); | |
1118 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
85b4aa49 | 1119 | if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
bc0e17f6 | 1120 | lp->qfull = 1; |
85b4aa49 RL |
1121 | } |
1122 | ||
1123 | return 0; | |
1124 | } | |
85b4aa49 | 1125 | |
34f42a07 RL |
1126 | /** |
1127 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
1128 | * @arg: ptr to the fcoe per cpu struct |
1129 | * | |
1130 | * Return: 0 for success | |
85b4aa49 RL |
1131 | */ |
1132 | int fcoe_percpu_receive_thread(void *arg) | |
1133 | { | |
1134 | struct fcoe_percpu_s *p = arg; | |
1135 | u32 fr_len; | |
1136 | struct fc_lport *lp; | |
1137 | struct fcoe_rcv_info *fr; | |
1138 | struct fcoe_dev_stats *stats; | |
1139 | struct fc_frame_header *fh; | |
1140 | struct sk_buff *skb; | |
1141 | struct fcoe_crc_eof crc_eof; | |
1142 | struct fc_frame *fp; | |
1143 | u8 *mac = NULL; | |
1144 | struct fcoe_softc *fc; | |
1145 | struct fcoe_hdr *hp; | |
1146 | ||
4469c195 | 1147 | set_user_nice(current, -20); |
85b4aa49 RL |
1148 | |
1149 | while (!kthread_should_stop()) { | |
1150 | ||
1151 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1152 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
1153 | set_current_state(TASK_INTERRUPTIBLE); | |
1154 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1155 | schedule(); | |
1156 | set_current_state(TASK_RUNNING); | |
1157 | if (kthread_should_stop()) | |
1158 | return 0; | |
1159 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1160 | } | |
1161 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1162 | fr = fcoe_dev_from_skb(skb); | |
1163 | lp = fr->fr_dev; | |
1164 | if (unlikely(lp == NULL)) { | |
1165 | FC_DBG("invalid HBA Structure"); | |
1166 | kfree_skb(skb); | |
1167 | continue; | |
1168 | } | |
1169 | ||
85b4aa49 RL |
1170 | if (unlikely(debug_fcoe)) { |
1171 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p " | |
1172 | "tail:%p end:%p sum:%d dev:%s", | |
1173 | skb->len, skb->data_len, | |
1174 | skb->head, skb->data, skb_tail_pointer(skb), | |
1175 | skb_end_pointer(skb), skb->csum, | |
1176 | skb->dev ? skb->dev->name : "<NULL>"); | |
1177 | } | |
1178 | ||
1179 | /* | |
1180 | * Save source MAC address before discarding header. | |
1181 | */ | |
1182 | fc = lport_priv(lp); | |
85b4aa49 RL |
1183 | if (skb_is_nonlinear(skb)) |
1184 | skb_linearize(skb); /* not ideal */ | |
97c8389d | 1185 | mac = eth_hdr(skb)->h_source; |
85b4aa49 RL |
1186 | |
1187 | /* | |
1188 | * Frame length checks and setting up the header pointers | |
1189 | * was done in fcoe_rcv already. | |
1190 | */ | |
1191 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
1192 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1193 | ||
582b45bc | 1194 | stats = fc_lport_get_stats(lp); |
85b4aa49 | 1195 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
582b45bc RL |
1196 | if (stats->ErrorFrames < 5) |
1197 | printk(KERN_WARNING "FCoE version " | |
1198 | "mismatch: The frame has " | |
1199 | "version %x, but the " | |
1200 | "initiator supports version " | |
1201 | "%x\n", FC_FCOE_DECAPS_VER(hp), | |
1202 | FC_FCOE_VER); | |
1203 | stats->ErrorFrames++; | |
85b4aa49 RL |
1204 | kfree_skb(skb); |
1205 | continue; | |
1206 | } | |
1207 | ||
1208 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
1209 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
1210 | ||
582b45bc RL |
1211 | stats->RxFrames++; |
1212 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
85b4aa49 RL |
1213 | |
1214 | fp = (struct fc_frame *)skb; | |
1215 | fc_frame_init(fp); | |
1216 | fr_dev(fp) = lp; | |
1217 | fr_sof(fp) = hp->fcoe_sof; | |
1218 | ||
1219 | /* Copy out the CRC and EOF trailer for access */ | |
1220 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
1221 | kfree_skb(skb); | |
1222 | continue; | |
1223 | } | |
1224 | fr_eof(fp) = crc_eof.fcoe_eof; | |
1225 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
1226 | if (pskb_trim(skb, fr_len)) { | |
1227 | kfree_skb(skb); | |
1228 | continue; | |
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * We only check CRC if no offload is available and if it is | |
1233 | * it's solicited data, in which case, the FCP layer would | |
1234 | * check it during the copy. | |
1235 | */ | |
07c00ec4 | 1236 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
85b4aa49 RL |
1237 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
1238 | else | |
1239 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
1240 | ||
1241 | fh = fc_frame_header_get(fp); | |
1242 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
1243 | fh->fh_type == FC_TYPE_FCP) { | |
1244 | fc_exch_recv(lp, lp->emp, fp); | |
1245 | continue; | |
1246 | } | |
1247 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
1248 | if (le32_to_cpu(fr_crc(fp)) != | |
1249 | ~crc32(~0, skb->data, fr_len)) { | |
1250 | if (debug_fcoe || stats->InvalidCRCCount < 5) | |
1251 | printk(KERN_WARNING "fcoe: dropping " | |
1252 | "frame with CRC error\n"); | |
1253 | stats->InvalidCRCCount++; | |
1254 | stats->ErrorFrames++; | |
1255 | fc_frame_free(fp); | |
1256 | continue; | |
1257 | } | |
1258 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
1259 | } | |
97c8389d JE |
1260 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) && |
1261 | fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) { | |
1262 | fc_frame_free(fp); | |
1263 | continue; | |
1264 | } | |
85b4aa49 RL |
1265 | fc_exch_recv(lp, lp->emp, fp); |
1266 | } | |
1267 | return 0; | |
1268 | } | |
1269 | ||
85b4aa49 | 1270 | /** |
34f42a07 | 1271 | * fcoe_watchdog() - fcoe timer callback |
85b4aa49 RL |
1272 | * @vp: |
1273 | * | |
bc0e17f6 | 1274 | * This checks the pending queue length for fcoe and set lport qfull |
85b4aa49 RL |
1275 | * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the |
1276 | * fcoe_hostlist. | |
1277 | * | |
1278 | * Returns: 0 for success | |
34f42a07 | 1279 | */ |
85b4aa49 RL |
1280 | void fcoe_watchdog(ulong vp) |
1281 | { | |
85b4aa49 | 1282 | struct fcoe_softc *fc; |
85b4aa49 RL |
1283 | |
1284 | read_lock(&fcoe_hostlist_lock); | |
1285 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
97c8389d JE |
1286 | if (fc->ctlr.lp) |
1287 | fcoe_check_wait_queue(fc->ctlr.lp); | |
85b4aa49 RL |
1288 | } |
1289 | read_unlock(&fcoe_hostlist_lock); | |
1290 | ||
1291 | fcoe_timer.expires = jiffies + (1 * HZ); | |
1292 | add_timer(&fcoe_timer); | |
1293 | } | |
1294 | ||
1295 | ||
1296 | /** | |
dd3fd72e CL |
1297 | * fcoe_check_wait_queue() - attempt to clear the transmit backlog |
1298 | * @lp: the fc_lport | |
85b4aa49 RL |
1299 | * |
1300 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
1301 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 | 1302 | * transmitted, return qlen or -1 if a error occurs, then restore |
dd3fd72e | 1303 | * wait_queue and try again later. |
85b4aa49 RL |
1304 | * |
1305 | * The wait_queue is used when the skb transmit fails. skb will go | |
dd3fd72e | 1306 | * in the wait_queue which will be emptied by the timer function or |
85b4aa49 RL |
1307 | * by the next skb transmit. |
1308 | * | |
1309 | * Returns: 0 for success | |
34f42a07 | 1310 | */ |
85b4aa49 RL |
1311 | static int fcoe_check_wait_queue(struct fc_lport *lp) |
1312 | { | |
55c8bafb | 1313 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 | 1314 | struct sk_buff *skb; |
c826a314 | 1315 | int rc = -1; |
85b4aa49 | 1316 | |
85b4aa49 | 1317 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
c826a314 VD |
1318 | if (fc->fcoe_pending_queue_active) |
1319 | goto out; | |
1320 | fc->fcoe_pending_queue_active = 1; | |
55c8bafb CL |
1321 | |
1322 | while (fc->fcoe_pending_queue.qlen) { | |
1323 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
1324 | fc->fcoe_pending_queue.qlen++; | |
1325 | skb = __skb_dequeue(&fc->fcoe_pending_queue); | |
1326 | ||
1327 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1328 | rc = fcoe_start_io(skb); | |
1329 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1330 | ||
1331 | if (rc) { | |
1332 | __skb_queue_head(&fc->fcoe_pending_queue, skb); | |
1333 | /* undo temporary increment above */ | |
1334 | fc->fcoe_pending_queue.qlen--; | |
1335 | break; | |
85b4aa49 | 1336 | } |
55c8bafb CL |
1337 | /* undo temporary increment above */ |
1338 | fc->fcoe_pending_queue.qlen--; | |
85b4aa49 | 1339 | } |
55c8bafb CL |
1340 | |
1341 | if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) | |
1342 | lp->qfull = 0; | |
c826a314 VD |
1343 | fc->fcoe_pending_queue_active = 0; |
1344 | rc = fc->fcoe_pending_queue.qlen; | |
1345 | out: | |
85b4aa49 | 1346 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
c826a314 | 1347 | return rc; |
85b4aa49 RL |
1348 | } |
1349 | ||
85b4aa49 | 1350 | /** |
34f42a07 RL |
1351 | * fcoe_dev_setup() - setup link change notification interface |
1352 | */ | |
b0d428ad | 1353 | static void fcoe_dev_setup(void) |
85b4aa49 | 1354 | { |
85b4aa49 RL |
1355 | register_netdevice_notifier(&fcoe_notifier); |
1356 | } | |
1357 | ||
1358 | /** | |
b0d428ad | 1359 | * fcoe_dev_cleanup() - cleanup link change notification interface |
34f42a07 | 1360 | */ |
85b4aa49 RL |
1361 | static void fcoe_dev_cleanup(void) |
1362 | { | |
1363 | unregister_netdevice_notifier(&fcoe_notifier); | |
1364 | } | |
1365 | ||
1366 | /** | |
34f42a07 | 1367 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
1368 | * @notifier: context of the notification |
1369 | * @event: type of event | |
1370 | * @ptr: fixed array for output parsed ifname | |
1371 | * | |
1372 | * This function is called by the ethernet driver in case of link change event | |
1373 | * | |
1374 | * Returns: 0 for success | |
34f42a07 | 1375 | */ |
85b4aa49 RL |
1376 | static int fcoe_device_notification(struct notifier_block *notifier, |
1377 | ulong event, void *ptr) | |
1378 | { | |
1379 | struct fc_lport *lp = NULL; | |
1380 | struct net_device *real_dev = ptr; | |
1381 | struct fcoe_softc *fc; | |
1382 | struct fcoe_dev_stats *stats; | |
97c8389d | 1383 | u32 link_possible = 1; |
85b4aa49 RL |
1384 | u32 mfs; |
1385 | int rc = NOTIFY_OK; | |
1386 | ||
1387 | read_lock(&fcoe_hostlist_lock); | |
1388 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1389 | if (fc->real_dev == real_dev) { | |
97c8389d | 1390 | lp = fc->ctlr.lp; |
85b4aa49 RL |
1391 | break; |
1392 | } | |
1393 | } | |
1394 | read_unlock(&fcoe_hostlist_lock); | |
1395 | if (lp == NULL) { | |
1396 | rc = NOTIFY_DONE; | |
1397 | goto out; | |
1398 | } | |
1399 | ||
85b4aa49 RL |
1400 | switch (event) { |
1401 | case NETDEV_DOWN: | |
1402 | case NETDEV_GOING_DOWN: | |
97c8389d | 1403 | link_possible = 0; |
85b4aa49 RL |
1404 | break; |
1405 | case NETDEV_UP: | |
1406 | case NETDEV_CHANGE: | |
85b4aa49 RL |
1407 | break; |
1408 | case NETDEV_CHANGEMTU: | |
1409 | mfs = fc->real_dev->mtu - | |
1410 | (sizeof(struct fcoe_hdr) + | |
1411 | sizeof(struct fcoe_crc_eof)); | |
1412 | if (mfs >= FC_MIN_MAX_FRAME) | |
1413 | fc_set_mfs(lp, mfs); | |
85b4aa49 RL |
1414 | break; |
1415 | case NETDEV_REGISTER: | |
1416 | break; | |
1417 | default: | |
97c8389d | 1418 | FC_DBG("Unknown event %ld from netdev netlink\n", event); |
85b4aa49 | 1419 | } |
97c8389d JE |
1420 | if (link_possible && !fcoe_link_ok(lp)) |
1421 | fcoe_ctlr_link_up(&fc->ctlr); | |
1422 | else if (fcoe_ctlr_link_down(&fc->ctlr)) { | |
1423 | stats = fc_lport_get_stats(lp); | |
1424 | stats->LinkFailureCount++; | |
1425 | fcoe_clean_pending_queue(lp); | |
85b4aa49 RL |
1426 | } |
1427 | out: | |
1428 | return rc; | |
1429 | } | |
1430 | ||
1431 | /** | |
34f42a07 | 1432 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
1433 | * @buffer: incoming buffer to be copied |
1434 | * | |
dd3fd72e | 1435 | * Returns: NULL or ptr to net_device |
34f42a07 | 1436 | */ |
85b4aa49 RL |
1437 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
1438 | { | |
1439 | char *cp; | |
1440 | char ifname[IFNAMSIZ + 2]; | |
1441 | ||
1442 | if (buffer) { | |
1443 | strlcpy(ifname, buffer, IFNAMSIZ); | |
1444 | cp = ifname + strlen(ifname); | |
1445 | while (--cp >= ifname && *cp == '\n') | |
1446 | *cp = '\0'; | |
1447 | return dev_get_by_name(&init_net, ifname); | |
1448 | } | |
1449 | return NULL; | |
1450 | } | |
1451 | ||
1452 | /** | |
dd3fd72e | 1453 | * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev |
85b4aa49 RL |
1454 | * @netdev: the target netdev |
1455 | * | |
1456 | * Returns: ptr to the struct module, NULL for failure | |
34f42a07 | 1457 | */ |
b2ab99c9 RL |
1458 | static struct module * |
1459 | fcoe_netdev_to_module_owner(const struct net_device *netdev) | |
85b4aa49 RL |
1460 | { |
1461 | struct device *dev; | |
1462 | ||
1463 | if (!netdev) | |
1464 | return NULL; | |
1465 | ||
1466 | dev = netdev->dev.parent; | |
1467 | if (!dev) | |
1468 | return NULL; | |
1469 | ||
1470 | if (!dev->driver) | |
1471 | return NULL; | |
1472 | ||
1473 | return dev->driver->owner; | |
1474 | } | |
1475 | ||
1476 | /** | |
34f42a07 | 1477 | * fcoe_ethdrv_get() - Hold the Ethernet driver |
85b4aa49 RL |
1478 | * @netdev: the target netdev |
1479 | * | |
34f42a07 RL |
1480 | * Holds the Ethernet driver module by try_module_get() for |
1481 | * the corresponding netdev. | |
1482 | * | |
dd3fd72e | 1483 | * Returns: 0 for success |
34f42a07 | 1484 | */ |
85b4aa49 RL |
1485 | static int fcoe_ethdrv_get(const struct net_device *netdev) |
1486 | { | |
1487 | struct module *owner; | |
1488 | ||
1489 | owner = fcoe_netdev_to_module_owner(netdev); | |
1490 | if (owner) { | |
56b854bb JB |
1491 | printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n", |
1492 | module_name(owner), netdev->name); | |
85b4aa49 RL |
1493 | return try_module_get(owner); |
1494 | } | |
1495 | return -ENODEV; | |
1496 | } | |
1497 | ||
1498 | /** | |
34f42a07 | 1499 | * fcoe_ethdrv_put() - Release the Ethernet driver |
85b4aa49 RL |
1500 | * @netdev: the target netdev |
1501 | * | |
34f42a07 RL |
1502 | * Releases the Ethernet driver module by module_put for |
1503 | * the corresponding netdev. | |
1504 | * | |
dd3fd72e | 1505 | * Returns: 0 for success |
34f42a07 | 1506 | */ |
85b4aa49 RL |
1507 | static int fcoe_ethdrv_put(const struct net_device *netdev) |
1508 | { | |
1509 | struct module *owner; | |
1510 | ||
1511 | owner = fcoe_netdev_to_module_owner(netdev); | |
1512 | if (owner) { | |
56b854bb JB |
1513 | printk(KERN_DEBUG "fcoe:release driver module %s for %s\n", |
1514 | module_name(owner), netdev->name); | |
85b4aa49 RL |
1515 | module_put(owner); |
1516 | return 0; | |
1517 | } | |
1518 | return -ENODEV; | |
1519 | } | |
1520 | ||
1521 | /** | |
34f42a07 | 1522 | * fcoe_destroy() - handles the destroy from sysfs |
dd3fd72e | 1523 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1524 | * @kp: associated kernel param |
1525 | * | |
1526 | * Returns: 0 for success | |
34f42a07 | 1527 | */ |
85b4aa49 RL |
1528 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
1529 | { | |
1530 | int rc; | |
1531 | struct net_device *netdev; | |
1532 | ||
1533 | netdev = fcoe_if_to_netdev(buffer); | |
1534 | if (!netdev) { | |
1535 | rc = -ENODEV; | |
1536 | goto out_nodev; | |
1537 | } | |
1538 | /* look for existing lport */ | |
1539 | if (!fcoe_hostlist_lookup(netdev)) { | |
1540 | rc = -ENODEV; | |
1541 | goto out_putdev; | |
1542 | } | |
7f349142 | 1543 | rc = fcoe_if_destroy(netdev); |
85b4aa49 | 1544 | if (rc) { |
7f349142 | 1545 | printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n", |
85b4aa49 RL |
1546 | netdev->name); |
1547 | rc = -EIO; | |
1548 | goto out_putdev; | |
1549 | } | |
1550 | fcoe_ethdrv_put(netdev); | |
1551 | rc = 0; | |
1552 | out_putdev: | |
1553 | dev_put(netdev); | |
1554 | out_nodev: | |
1555 | return rc; | |
1556 | } | |
1557 | ||
1558 | /** | |
34f42a07 | 1559 | * fcoe_create() - Handles the create call from sysfs |
dd3fd72e | 1560 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1561 | * @kp: associated kernel param |
1562 | * | |
1563 | * Returns: 0 for success | |
34f42a07 | 1564 | */ |
85b4aa49 RL |
1565 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1566 | { | |
1567 | int rc; | |
1568 | struct net_device *netdev; | |
1569 | ||
1570 | netdev = fcoe_if_to_netdev(buffer); | |
1571 | if (!netdev) { | |
1572 | rc = -ENODEV; | |
1573 | goto out_nodev; | |
1574 | } | |
1575 | /* look for existing lport */ | |
1576 | if (fcoe_hostlist_lookup(netdev)) { | |
1577 | rc = -EEXIST; | |
1578 | goto out_putdev; | |
1579 | } | |
1580 | fcoe_ethdrv_get(netdev); | |
1581 | ||
7f349142 | 1582 | rc = fcoe_if_create(netdev); |
85b4aa49 | 1583 | if (rc) { |
7f349142 | 1584 | printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n", |
85b4aa49 RL |
1585 | netdev->name); |
1586 | fcoe_ethdrv_put(netdev); | |
1587 | rc = -EIO; | |
1588 | goto out_putdev; | |
1589 | } | |
1590 | rc = 0; | |
1591 | out_putdev: | |
1592 | dev_put(netdev); | |
1593 | out_nodev: | |
1594 | return rc; | |
1595 | } | |
1596 | ||
1597 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1598 | __MODULE_PARM_TYPE(create, "string"); | |
1599 | MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); | |
1600 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); | |
1601 | __MODULE_PARM_TYPE(destroy, "string"); | |
1602 | MODULE_PARM_DESC(destroy, "Destroy fcoe port"); | |
1603 | ||
34f42a07 RL |
1604 | /** |
1605 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1606 | * @lp: ptr to the fc_lport |
1607 | * | |
1608 | * Any permanently-disqualifying conditions have been previously checked. | |
1609 | * This also updates the speed setting, which may change with link for 100/1000. | |
1610 | * | |
1611 | * This function should probably be checking for PAUSE support at some point | |
1612 | * in the future. Currently Per-priority-pause is not determinable using | |
1613 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1614 | * | |
1615 | * Returns: 0 if link is OK for use by FCoE. | |
1616 | * | |
1617 | */ | |
1618 | int fcoe_link_ok(struct fc_lport *lp) | |
1619 | { | |
fc47ff6b | 1620 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 RL |
1621 | struct net_device *dev = fc->real_dev; |
1622 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; | |
1623 | int rc = 0; | |
1624 | ||
1625 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) { | |
1626 | dev = fc->phys_dev; | |
1627 | if (dev->ethtool_ops->get_settings) { | |
1628 | dev->ethtool_ops->get_settings(dev, &ecmd); | |
1629 | lp->link_supported_speeds &= | |
1630 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1631 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1632 | SUPPORTED_1000baseT_Full)) | |
1633 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1634 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1635 | lp->link_supported_speeds |= | |
1636 | FC_PORTSPEED_10GBIT; | |
1637 | if (ecmd.speed == SPEED_1000) | |
1638 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1639 | if (ecmd.speed == SPEED_10000) | |
1640 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
1641 | } | |
1642 | } else | |
1643 | rc = -1; | |
1644 | ||
1645 | return rc; | |
1646 | } | |
85b4aa49 | 1647 | |
34f42a07 RL |
1648 | /** |
1649 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 RL |
1650 | * @lp: the fc_lport |
1651 | */ | |
1652 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1653 | { | |
85b4aa49 RL |
1654 | struct fcoe_percpu_s *pp; |
1655 | struct fcoe_rcv_info *fr; | |
1656 | struct sk_buff_head *list; | |
1657 | struct sk_buff *skb, *next; | |
1658 | struct sk_buff *head; | |
5e5e92df | 1659 | unsigned int cpu; |
85b4aa49 | 1660 | |
5e5e92df RL |
1661 | for_each_possible_cpu(cpu) { |
1662 | pp = &per_cpu(fcoe_percpu, cpu); | |
1663 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1664 | list = &pp->fcoe_rx_list; | |
1665 | head = list->next; | |
1666 | for (skb = head; skb != (struct sk_buff *)list; | |
1667 | skb = next) { | |
1668 | next = skb->next; | |
1669 | fr = fcoe_dev_from_skb(skb); | |
1670 | if (fr->fr_dev == lp) { | |
1671 | __skb_unlink(skb, list); | |
1672 | kfree_skb(skb); | |
85b4aa49 | 1673 | } |
85b4aa49 | 1674 | } |
5e5e92df | 1675 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
85b4aa49 RL |
1676 | } |
1677 | } | |
85b4aa49 RL |
1678 | |
1679 | /** | |
34f42a07 | 1680 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1681 | * @lp: the corresponding fc_lport |
1682 | * | |
1683 | * Returns: none | |
34f42a07 | 1684 | */ |
85b4aa49 RL |
1685 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1686 | { | |
1687 | struct fcoe_softc *fc = lport_priv(lp); | |
1688 | struct sk_buff *skb; | |
1689 | ||
1690 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1691 | while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { | |
1692 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1693 | kfree_skb(skb); | |
1694 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1695 | } | |
1696 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1697 | } | |
85b4aa49 | 1698 | |
34f42a07 RL |
1699 | /** |
1700 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
1701 | * @shost: shost the reset is from |
1702 | * | |
1703 | * Returns: always 0 | |
1704 | */ | |
1705 | int fcoe_reset(struct Scsi_Host *shost) | |
1706 | { | |
1707 | struct fc_lport *lport = shost_priv(shost); | |
1708 | fc_lport_reset(lport); | |
1709 | return 0; | |
1710 | } | |
85b4aa49 | 1711 | |
34f42a07 RL |
1712 | /** |
1713 | * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device | |
dd3fd72e | 1714 | * @dev: this is currently ptr to net_device |
85b4aa49 RL |
1715 | * |
1716 | * Returns: NULL or the located fcoe_softc | |
1717 | */ | |
b2ab99c9 RL |
1718 | static struct fcoe_softc * |
1719 | fcoe_hostlist_lookup_softc(const struct net_device *dev) | |
85b4aa49 RL |
1720 | { |
1721 | struct fcoe_softc *fc; | |
1722 | ||
1723 | read_lock(&fcoe_hostlist_lock); | |
1724 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1725 | if (fc->real_dev == dev) { | |
1726 | read_unlock(&fcoe_hostlist_lock); | |
1727 | return fc; | |
1728 | } | |
1729 | } | |
1730 | read_unlock(&fcoe_hostlist_lock); | |
1731 | return NULL; | |
1732 | } | |
1733 | ||
34f42a07 RL |
1734 | /** |
1735 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
1736 | * @netdev: ptr to net_device |
1737 | * | |
1738 | * Returns: 0 for success | |
1739 | */ | |
1740 | struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) | |
1741 | { | |
1742 | struct fcoe_softc *fc; | |
1743 | ||
1744 | fc = fcoe_hostlist_lookup_softc(netdev); | |
1745 | ||
97c8389d | 1746 | return (fc) ? fc->ctlr.lp : NULL; |
85b4aa49 | 1747 | } |
85b4aa49 | 1748 | |
34f42a07 RL |
1749 | /** |
1750 | * fcoe_hostlist_add() - Add a lport to lports list | |
dd3fd72e | 1751 | * @lp: ptr to the fc_lport to be added |
85b4aa49 RL |
1752 | * |
1753 | * Returns: 0 for success | |
1754 | */ | |
1755 | int fcoe_hostlist_add(const struct fc_lport *lp) | |
1756 | { | |
1757 | struct fcoe_softc *fc; | |
1758 | ||
1759 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1760 | if (!fc) { | |
fc47ff6b | 1761 | fc = lport_priv(lp); |
85b4aa49 RL |
1762 | write_lock_bh(&fcoe_hostlist_lock); |
1763 | list_add_tail(&fc->list, &fcoe_hostlist); | |
1764 | write_unlock_bh(&fcoe_hostlist_lock); | |
1765 | } | |
1766 | return 0; | |
1767 | } | |
85b4aa49 | 1768 | |
34f42a07 RL |
1769 | /** |
1770 | * fcoe_hostlist_remove() - remove a lport from lports list | |
dd3fd72e | 1771 | * @lp: ptr to the fc_lport to be removed |
85b4aa49 RL |
1772 | * |
1773 | * Returns: 0 for success | |
1774 | */ | |
1775 | int fcoe_hostlist_remove(const struct fc_lport *lp) | |
1776 | { | |
1777 | struct fcoe_softc *fc; | |
1778 | ||
1779 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1780 | BUG_ON(!fc); | |
1781 | write_lock_bh(&fcoe_hostlist_lock); | |
1782 | list_del(&fc->list); | |
1783 | write_unlock_bh(&fcoe_hostlist_lock); | |
1784 | ||
1785 | return 0; | |
1786 | } | |
85b4aa49 | 1787 | |
85b4aa49 | 1788 | /** |
34f42a07 | 1789 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 | 1790 | * |
85b4aa49 | 1791 | * Returns 0 on success, negative on failure |
34f42a07 | 1792 | */ |
85b4aa49 RL |
1793 | static int __init fcoe_init(void) |
1794 | { | |
38eccabd | 1795 | unsigned int cpu; |
8976f424 | 1796 | int rc = 0; |
85b4aa49 RL |
1797 | struct fcoe_percpu_s *p; |
1798 | ||
85b4aa49 RL |
1799 | INIT_LIST_HEAD(&fcoe_hostlist); |
1800 | rwlock_init(&fcoe_hostlist_lock); | |
1801 | ||
38eccabd | 1802 | for_each_possible_cpu(cpu) { |
5e5e92df | 1803 | p = &per_cpu(fcoe_percpu, cpu); |
38eccabd RL |
1804 | skb_queue_head_init(&p->fcoe_rx_list); |
1805 | } | |
1806 | ||
8976f424 RL |
1807 | for_each_online_cpu(cpu) |
1808 | fcoe_percpu_thread_create(cpu); | |
85b4aa49 | 1809 | |
8976f424 RL |
1810 | /* Initialize per CPU interrupt thread */ |
1811 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); | |
1812 | if (rc) | |
1813 | goto out_free; | |
85b4aa49 | 1814 | |
8976f424 | 1815 | /* Setup link change notification */ |
85b4aa49 RL |
1816 | fcoe_dev_setup(); |
1817 | ||
a468f328 RL |
1818 | setup_timer(&fcoe_timer, fcoe_watchdog, 0); |
1819 | ||
1820 | mod_timer(&fcoe_timer, jiffies + (10 * HZ)); | |
85b4aa49 | 1821 | |
7f349142 | 1822 | fcoe_if_init(); |
85b4aa49 RL |
1823 | |
1824 | return 0; | |
8976f424 RL |
1825 | |
1826 | out_free: | |
1827 | for_each_online_cpu(cpu) { | |
1828 | fcoe_percpu_thread_destroy(cpu); | |
1829 | } | |
1830 | ||
1831 | return rc; | |
85b4aa49 RL |
1832 | } |
1833 | module_init(fcoe_init); | |
1834 | ||
1835 | /** | |
34f42a07 | 1836 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
1837 | * |
1838 | * Returns 0 on success, negative on failure | |
34f42a07 | 1839 | */ |
85b4aa49 RL |
1840 | static void __exit fcoe_exit(void) |
1841 | { | |
5e5e92df | 1842 | unsigned int cpu; |
85b4aa49 | 1843 | struct fcoe_softc *fc, *tmp; |
85b4aa49 | 1844 | |
85b4aa49 RL |
1845 | fcoe_dev_cleanup(); |
1846 | ||
582b45bc | 1847 | /* Stop the timer */ |
85b4aa49 RL |
1848 | del_timer_sync(&fcoe_timer); |
1849 | ||
5919a595 | 1850 | /* releases the associated fcoe hosts */ |
85b4aa49 | 1851 | list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
7f349142 | 1852 | fcoe_if_destroy(fc->real_dev); |
85b4aa49 | 1853 | |
8976f424 RL |
1854 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
1855 | ||
1856 | for_each_online_cpu(cpu) { | |
1857 | fcoe_percpu_thread_destroy(cpu); | |
85b4aa49 RL |
1858 | } |
1859 | ||
7f349142 VD |
1860 | /* detach from scsi transport */ |
1861 | fcoe_if_exit(); | |
85b4aa49 RL |
1862 | } |
1863 | module_exit(fcoe_exit); |