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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 | |
85b4aa49 RL |
48 | MODULE_AUTHOR("Open-FCoE.org"); |
49 | MODULE_DESCRIPTION("FCoE"); | |
9b34ecff | 50 | MODULE_LICENSE("GPL v2"); |
85b4aa49 RL |
51 | |
52 | /* fcoe host list */ | |
53 | LIST_HEAD(fcoe_hostlist); | |
54 | DEFINE_RWLOCK(fcoe_hostlist_lock); | |
5e5e92df | 55 | DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
85b4aa49 | 56 | |
dd3fd72e | 57 | /* Function Prototypes */ |
fdd78027 VD |
58 | static int fcoe_reset(struct Scsi_Host *shost); |
59 | static int fcoe_xmit(struct fc_lport *, struct fc_frame *); | |
60 | static int fcoe_rcv(struct sk_buff *, struct net_device *, | |
61 | struct packet_type *, struct net_device *); | |
62 | static int fcoe_percpu_receive_thread(void *arg); | |
63 | static void fcoe_clean_pending_queue(struct fc_lport *lp); | |
64 | static void fcoe_percpu_clean(struct fc_lport *lp); | |
65 | static int fcoe_link_ok(struct fc_lport *lp); | |
66 | ||
67 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); | |
68 | static int fcoe_hostlist_add(const struct fc_lport *); | |
69 | static int fcoe_hostlist_remove(const struct fc_lport *); | |
70 | ||
4bb6b515 | 71 | static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *); |
85b4aa49 RL |
72 | static int fcoe_device_notification(struct notifier_block *, ulong, void *); |
73 | static void fcoe_dev_setup(void); | |
74 | static void fcoe_dev_cleanup(void); | |
75 | ||
76 | /* notification function from net device */ | |
77 | static struct notifier_block fcoe_notifier = { | |
78 | .notifier_call = fcoe_device_notification, | |
79 | }; | |
80 | ||
7f349142 VD |
81 | static struct scsi_transport_template *scsi_transport_fcoe_sw; |
82 | ||
83 | struct fc_function_template fcoe_transport_function = { | |
84 | .show_host_node_name = 1, | |
85 | .show_host_port_name = 1, | |
86 | .show_host_supported_classes = 1, | |
87 | .show_host_supported_fc4s = 1, | |
88 | .show_host_active_fc4s = 1, | |
89 | .show_host_maxframe_size = 1, | |
90 | ||
91 | .show_host_port_id = 1, | |
92 | .show_host_supported_speeds = 1, | |
93 | .get_host_speed = fc_get_host_speed, | |
94 | .show_host_speed = 1, | |
95 | .show_host_port_type = 1, | |
96 | .get_host_port_state = fc_get_host_port_state, | |
97 | .show_host_port_state = 1, | |
98 | .show_host_symbolic_name = 1, | |
99 | ||
100 | .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), | |
101 | .show_rport_maxframe_size = 1, | |
102 | .show_rport_supported_classes = 1, | |
103 | ||
104 | .show_host_fabric_name = 1, | |
105 | .show_starget_node_name = 1, | |
106 | .show_starget_port_name = 1, | |
107 | .show_starget_port_id = 1, | |
108 | .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, | |
109 | .show_rport_dev_loss_tmo = 1, | |
110 | .get_fc_host_stats = fc_get_host_stats, | |
111 | .issue_fc_host_lip = fcoe_reset, | |
112 | ||
113 | .terminate_rport_io = fc_rport_terminate_io, | |
114 | }; | |
115 | ||
116 | static struct scsi_host_template fcoe_shost_template = { | |
117 | .module = THIS_MODULE, | |
118 | .name = "FCoE Driver", | |
119 | .proc_name = FCOE_NAME, | |
120 | .queuecommand = fc_queuecommand, | |
121 | .eh_abort_handler = fc_eh_abort, | |
122 | .eh_device_reset_handler = fc_eh_device_reset, | |
123 | .eh_host_reset_handler = fc_eh_host_reset, | |
124 | .slave_alloc = fc_slave_alloc, | |
125 | .change_queue_depth = fc_change_queue_depth, | |
126 | .change_queue_type = fc_change_queue_type, | |
127 | .this_id = -1, | |
128 | .cmd_per_lun = 32, | |
129 | .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, | |
130 | .use_clustering = ENABLE_CLUSTERING, | |
131 | .sg_tablesize = SG_ALL, | |
132 | .max_sectors = 0xffff, | |
133 | }; | |
134 | ||
ab6b85c1 VD |
135 | /** |
136 | * fcoe_fip_recv - handle a received FIP frame. | |
137 | * @skb: the receive skb | |
138 | * @dev: associated &net_device | |
139 | * @ptype: the &packet_type structure which was used to register this handler. | |
140 | * @orig_dev: original receive &net_device, in case @dev is a bond. | |
141 | * | |
142 | * Returns: 0 for success | |
143 | */ | |
144 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, | |
145 | struct packet_type *ptype, | |
146 | struct net_device *orig_dev) | |
147 | { | |
148 | struct fcoe_softc *fc; | |
149 | ||
150 | fc = container_of(ptype, struct fcoe_softc, fip_packet_type); | |
151 | fcoe_ctlr_recv(&fc->ctlr, skb); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | /** | |
156 | * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame. | |
157 | * @fip: FCoE controller. | |
158 | * @skb: FIP Packet. | |
159 | */ | |
160 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
161 | { | |
162 | skb->dev = fcoe_from_ctlr(fip)->real_dev; | |
163 | dev_queue_xmit(skb); | |
164 | } | |
165 | ||
166 | /** | |
167 | * fcoe_update_src_mac() - Update Ethernet MAC filters. | |
168 | * @fip: FCoE controller. | |
169 | * @old: Unicast MAC address to delete if the MAC is non-zero. | |
170 | * @new: Unicast MAC address to add. | |
171 | * | |
172 | * Remove any previously-set unicast MAC filter. | |
173 | * Add secondary FCoE MAC address filter for our OUI. | |
174 | */ | |
175 | static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new) | |
176 | { | |
177 | struct fcoe_softc *fc; | |
178 | ||
179 | fc = fcoe_from_ctlr(fip); | |
180 | rtnl_lock(); | |
181 | if (!is_zero_ether_addr(old)) | |
ccffad25 JP |
182 | dev_unicast_delete(fc->real_dev, old); |
183 | dev_unicast_add(fc->real_dev, new); | |
ab6b85c1 VD |
184 | rtnl_unlock(); |
185 | } | |
186 | ||
7f349142 VD |
187 | /** |
188 | * fcoe_lport_config() - sets up the fc_lport | |
189 | * @lp: ptr to the fc_lport | |
7f349142 VD |
190 | * |
191 | * Returns: 0 for success | |
192 | */ | |
193 | static int fcoe_lport_config(struct fc_lport *lp) | |
194 | { | |
195 | lp->link_up = 0; | |
196 | lp->qfull = 0; | |
197 | lp->max_retry_count = 3; | |
a3666955 | 198 | lp->max_rport_retry_count = 3; |
7f349142 VD |
199 | lp->e_d_tov = 2 * 1000; /* FC-FS default */ |
200 | lp->r_a_tov = 2 * 2 * 1000; | |
201 | lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | | |
202 | FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); | |
203 | ||
204 | fc_lport_init_stats(lp); | |
205 | ||
206 | /* lport fc_lport related configuration */ | |
207 | fc_lport_config(lp); | |
208 | ||
209 | /* offload related configuration */ | |
210 | lp->crc_offload = 0; | |
211 | lp->seq_offload = 0; | |
212 | lp->lro_enabled = 0; | |
213 | lp->lro_xid = 0; | |
214 | lp->lso_max = 0; | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
ab6b85c1 VD |
219 | /** |
220 | * fcoe_netdev_cleanup() - clean up netdev configurations | |
221 | * @fc: ptr to the fcoe_softc | |
222 | */ | |
223 | void fcoe_netdev_cleanup(struct fcoe_softc *fc) | |
224 | { | |
225 | u8 flogi_maddr[ETH_ALEN]; | |
226 | ||
227 | /* Don't listen for Ethernet packets anymore */ | |
228 | dev_remove_pack(&fc->fcoe_packet_type); | |
229 | dev_remove_pack(&fc->fip_packet_type); | |
230 | ||
231 | /* Delete secondary MAC addresses */ | |
232 | rtnl_lock(); | |
233 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
ccffad25 | 234 | dev_unicast_delete(fc->real_dev, flogi_maddr); |
ab6b85c1 | 235 | if (!is_zero_ether_addr(fc->ctlr.data_src_addr)) |
ccffad25 | 236 | dev_unicast_delete(fc->real_dev, fc->ctlr.data_src_addr); |
184dd345 | 237 | if (fc->ctlr.spma) |
ccffad25 | 238 | dev_unicast_delete(fc->real_dev, fc->ctlr.ctl_src_addr); |
ab6b85c1 VD |
239 | dev_mc_delete(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); |
240 | rtnl_unlock(); | |
241 | } | |
242 | ||
1047f221 VD |
243 | /** |
244 | * fcoe_queue_timer() - fcoe queue timer | |
245 | * @lp: the fc_lport pointer | |
246 | * | |
247 | * Calls fcoe_check_wait_queue on timeout | |
248 | * | |
249 | */ | |
250 | static void fcoe_queue_timer(ulong lp) | |
251 | { | |
252 | fcoe_check_wait_queue((struct fc_lport *)lp, NULL); | |
253 | } | |
254 | ||
7f349142 VD |
255 | /** |
256 | * fcoe_netdev_config() - Set up netdev for SW FCoE | |
257 | * @lp : ptr to the fc_lport | |
258 | * @netdev : ptr to the associated netdevice struct | |
259 | * | |
260 | * Must be called after fcoe_lport_config() as it will use lport mutex | |
261 | * | |
262 | * Returns : 0 for success | |
263 | */ | |
264 | static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) | |
265 | { | |
266 | u32 mfs; | |
267 | u64 wwnn, wwpn; | |
268 | struct fcoe_softc *fc; | |
269 | u8 flogi_maddr[ETH_ALEN]; | |
184dd345 | 270 | struct netdev_hw_addr *ha; |
7f349142 VD |
271 | |
272 | /* Setup lport private data to point to fcoe softc */ | |
273 | fc = lport_priv(lp); | |
97c8389d | 274 | fc->ctlr.lp = lp; |
7f349142 VD |
275 | fc->real_dev = netdev; |
276 | fc->phys_dev = netdev; | |
277 | ||
278 | /* Require support for get_pauseparam ethtool op. */ | |
279 | if (netdev->priv_flags & IFF_802_1Q_VLAN) | |
280 | fc->phys_dev = vlan_dev_real_dev(netdev); | |
281 | ||
282 | /* Do not support for bonding device */ | |
283 | if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) || | |
284 | (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) || | |
285 | (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) { | |
286 | return -EOPNOTSUPP; | |
287 | } | |
288 | ||
289 | /* | |
290 | * Determine max frame size based on underlying device and optional | |
291 | * user-configured limit. If the MFS is too low, fcoe_link_ok() | |
292 | * will return 0, so do this first. | |
293 | */ | |
294 | mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) + | |
295 | sizeof(struct fcoe_crc_eof)); | |
296 | if (fc_set_mfs(lp, mfs)) | |
297 | return -EINVAL; | |
298 | ||
7f349142 VD |
299 | /* offload features support */ |
300 | if (fc->real_dev->features & NETIF_F_SG) | |
301 | lp->sg_supp = 1; | |
302 | ||
7f349142 VD |
303 | if (netdev->features & NETIF_F_FCOE_CRC) { |
304 | lp->crc_offload = 1; | |
d5488eb9 | 305 | FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); |
7f349142 | 306 | } |
7f349142 VD |
307 | if (netdev->features & NETIF_F_FSO) { |
308 | lp->seq_offload = 1; | |
309 | lp->lso_max = netdev->gso_max_size; | |
d5488eb9 RL |
310 | FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", |
311 | lp->lso_max); | |
7f349142 | 312 | } |
7f349142 VD |
313 | if (netdev->fcoe_ddp_xid) { |
314 | lp->lro_enabled = 1; | |
315 | lp->lro_xid = netdev->fcoe_ddp_xid; | |
d5488eb9 RL |
316 | FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", |
317 | lp->lro_xid); | |
7f349142 VD |
318 | } |
319 | skb_queue_head_init(&fc->fcoe_pending_queue); | |
320 | fc->fcoe_pending_queue_active = 0; | |
1047f221 | 321 | setup_timer(&fc->timer, fcoe_queue_timer, (unsigned long)lp); |
7f349142 | 322 | |
184dd345 VD |
323 | /* look for SAN MAC address, if multiple SAN MACs exist, only |
324 | * use the first one for SPMA */ | |
325 | rcu_read_lock(); | |
326 | for_each_dev_addr(netdev, ha) { | |
327 | if ((ha->type == NETDEV_HW_ADDR_T_SAN) && | |
7a7f0c7f | 328 | (is_valid_ether_addr(ha->addr))) { |
184dd345 VD |
329 | memcpy(fc->ctlr.ctl_src_addr, ha->addr, ETH_ALEN); |
330 | fc->ctlr.spma = 1; | |
331 | break; | |
332 | } | |
333 | } | |
334 | rcu_read_unlock(); | |
335 | ||
7f349142 | 336 | /* setup Source Mac Address */ |
184dd345 VD |
337 | if (!fc->ctlr.spma) |
338 | memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr, | |
339 | fc->real_dev->addr_len); | |
7f349142 VD |
340 | |
341 | wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0); | |
342 | fc_set_wwnn(lp, wwnn); | |
343 | /* XXX - 3rd arg needs to be vlan id */ | |
344 | wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0); | |
345 | fc_set_wwpn(lp, wwpn); | |
346 | ||
347 | /* | |
348 | * Add FCoE MAC address as second unicast MAC address | |
349 | * or enter promiscuous mode if not capable of listening | |
350 | * for multiple unicast MACs. | |
351 | */ | |
352 | rtnl_lock(); | |
353 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
ccffad25 | 354 | dev_unicast_add(fc->real_dev, flogi_maddr); |
184dd345 | 355 | if (fc->ctlr.spma) |
ccffad25 | 356 | dev_unicast_add(fc->real_dev, fc->ctlr.ctl_src_addr); |
6401bdca | 357 | dev_mc_add(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); |
7f349142 VD |
358 | rtnl_unlock(); |
359 | ||
360 | /* | |
361 | * setup the receive function from ethernet driver | |
362 | * on the ethertype for the given device | |
363 | */ | |
364 | fc->fcoe_packet_type.func = fcoe_rcv; | |
365 | fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); | |
366 | fc->fcoe_packet_type.dev = fc->real_dev; | |
367 | dev_add_pack(&fc->fcoe_packet_type); | |
368 | ||
ab6b85c1 VD |
369 | fc->fip_packet_type.func = fcoe_fip_recv; |
370 | fc->fip_packet_type.type = htons(ETH_P_FIP); | |
371 | fc->fip_packet_type.dev = fc->real_dev; | |
372 | dev_add_pack(&fc->fip_packet_type); | |
373 | ||
7f349142 VD |
374 | return 0; |
375 | } | |
376 | ||
377 | /** | |
378 | * fcoe_shost_config() - Sets up fc_lport->host | |
379 | * @lp : ptr to the fc_lport | |
380 | * @shost : ptr to the associated scsi host | |
381 | * @dev : device associated to scsi host | |
382 | * | |
383 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() | |
384 | * | |
385 | * Returns : 0 for success | |
386 | */ | |
387 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, | |
388 | struct device *dev) | |
389 | { | |
390 | int rc = 0; | |
391 | ||
392 | /* lport scsi host config */ | |
393 | lp->host = shost; | |
394 | ||
395 | lp->host->max_lun = FCOE_MAX_LUN; | |
396 | lp->host->max_id = FCOE_MAX_FCP_TARGET; | |
397 | lp->host->max_channel = 0; | |
398 | lp->host->transportt = scsi_transport_fcoe_sw; | |
399 | ||
400 | /* add the new host to the SCSI-ml */ | |
401 | rc = scsi_add_host(lp->host, dev); | |
402 | if (rc) { | |
d5488eb9 RL |
403 | FCOE_NETDEV_DBG(fcoe_netdev(lp), "fcoe_shost_config: " |
404 | "error on scsi_add_host\n"); | |
7f349142 VD |
405 | return rc; |
406 | } | |
407 | sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", | |
408 | FCOE_NAME, FCOE_VERSION, | |
409 | fcoe_netdev(lp)->name); | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
d7179680 VD |
414 | /* |
415 | * fcoe_oem_match() - match for read types IO | |
416 | * @fp: the fc_frame for new IO. | |
417 | * | |
418 | * Returns : true for read types IO, otherwise returns false. | |
419 | */ | |
420 | bool fcoe_oem_match(struct fc_frame *fp) | |
421 | { | |
422 | return fc_fcp_is_read(fr_fsp(fp)); | |
423 | } | |
424 | ||
7f349142 VD |
425 | /** |
426 | * fcoe_em_config() - allocates em for this lport | |
427 | * @lp: the port that em is to allocated for | |
428 | * | |
e8af4d43 VD |
429 | * Called with write fcoe_hostlist_lock held. |
430 | * | |
7f349142 VD |
431 | * Returns : 0 on success |
432 | */ | |
433 | static inline int fcoe_em_config(struct fc_lport *lp) | |
434 | { | |
d7179680 VD |
435 | struct fcoe_softc *fc = lport_priv(lp); |
436 | struct fcoe_softc *oldfc = NULL; | |
437 | u16 min_xid = FCOE_MIN_XID; | |
438 | u16 max_xid = FCOE_MAX_XID; | |
439 | ||
440 | /* | |
441 | * Check if need to allocate an em instance for | |
442 | * offload exchange ids to be shared across all VN_PORTs/lport. | |
443 | */ | |
444 | if (!lp->lro_enabled || !lp->lro_xid || (lp->lro_xid >= max_xid)) { | |
445 | lp->lro_xid = 0; | |
446 | goto skip_oem; | |
447 | } | |
448 | ||
449 | /* | |
450 | * Reuse existing offload em instance in case | |
451 | * it is already allocated on phys_dev. | |
452 | */ | |
453 | list_for_each_entry(oldfc, &fcoe_hostlist, list) { | |
454 | if (oldfc->phys_dev == fc->phys_dev) { | |
455 | fc->oem = oldfc->oem; | |
456 | break; | |
457 | } | |
458 | } | |
459 | ||
460 | if (fc->oem) { | |
461 | if (!fc_exch_mgr_add(lp, fc->oem, fcoe_oem_match)) { | |
462 | printk(KERN_ERR "fcoe_em_config: failed to add " | |
463 | "offload em:%p on interface:%s\n", | |
464 | fc->oem, fc->real_dev->name); | |
465 | return -ENOMEM; | |
466 | } | |
467 | } else { | |
468 | fc->oem = fc_exch_mgr_alloc(lp, FC_CLASS_3, | |
469 | FCOE_MIN_XID, lp->lro_xid, | |
470 | fcoe_oem_match); | |
471 | if (!fc->oem) { | |
472 | printk(KERN_ERR "fcoe_em_config: failed to allocate " | |
473 | "em for offload exches on interface:%s\n", | |
474 | fc->real_dev->name); | |
475 | return -ENOMEM; | |
476 | } | |
477 | } | |
478 | ||
479 | /* | |
480 | * Exclude offload EM xid range from next EM xid range. | |
481 | */ | |
482 | min_xid += lp->lro_xid + 1; | |
483 | ||
484 | skip_oem: | |
485 | if (!fc_exch_mgr_alloc(lp, FC_CLASS_3, min_xid, max_xid, NULL)) { | |
486 | printk(KERN_ERR "fcoe_em_config: failed to " | |
487 | "allocate em on interface %s\n", fc->real_dev->name); | |
7f349142 | 488 | return -ENOMEM; |
d7179680 | 489 | } |
7f349142 VD |
490 | |
491 | return 0; | |
492 | } | |
493 | ||
494 | /** | |
495 | * fcoe_if_destroy() - FCoE software HBA tear-down function | |
496 | * @netdev: ptr to the associated net_device | |
497 | * | |
498 | * Returns: 0 if link is OK for use by FCoE. | |
499 | */ | |
500 | static int fcoe_if_destroy(struct net_device *netdev) | |
501 | { | |
502 | struct fc_lport *lp = NULL; | |
503 | struct fcoe_softc *fc; | |
7f349142 VD |
504 | |
505 | BUG_ON(!netdev); | |
506 | ||
d5488eb9 | 507 | FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); |
7f349142 VD |
508 | |
509 | lp = fcoe_hostlist_lookup(netdev); | |
510 | if (!lp) | |
511 | return -ENODEV; | |
512 | ||
513 | fc = lport_priv(lp); | |
514 | ||
515 | /* Logout of the fabric */ | |
516 | fc_fabric_logoff(lp); | |
517 | ||
518 | /* Remove the instance from fcoe's list */ | |
519 | fcoe_hostlist_remove(lp); | |
520 | ||
ab6b85c1 VD |
521 | /* clean up netdev configurations */ |
522 | fcoe_netdev_cleanup(fc); | |
523 | ||
524 | /* tear-down the FCoE controller */ | |
97c8389d | 525 | fcoe_ctlr_destroy(&fc->ctlr); |
7f349142 | 526 | |
f161fb72 JE |
527 | /* Free queued packets for the per-CPU receive threads */ |
528 | fcoe_percpu_clean(lp); | |
529 | ||
7f349142 VD |
530 | /* Cleanup the fc_lport */ |
531 | fc_lport_destroy(lp); | |
532 | fc_fcp_destroy(lp); | |
533 | ||
534 | /* Detach from the scsi-ml */ | |
535 | fc_remove_host(lp->host); | |
536 | scsi_remove_host(lp->host); | |
537 | ||
538 | /* There are no more rports or I/O, free the EM */ | |
52ff878c | 539 | fc_exch_mgr_free(lp); |
7f349142 | 540 | |
7f349142 VD |
541 | /* Free existing skbs */ |
542 | fcoe_clean_pending_queue(lp); | |
543 | ||
1047f221 VD |
544 | /* Stop the timer */ |
545 | del_timer_sync(&fc->timer); | |
546 | ||
7f349142 VD |
547 | /* Free memory used by statistical counters */ |
548 | fc_lport_free_stats(lp); | |
549 | ||
550 | /* Release the net_device and Scsi_Host */ | |
551 | dev_put(fc->real_dev); | |
552 | scsi_host_put(lp->host); | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | /* | |
558 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device | |
559 | * @lp: the corresponding fc_lport | |
560 | * @xid: the exchange id for this ddp transfer | |
561 | * @sgl: the scatterlist describing this transfer | |
562 | * @sgc: number of sg items | |
563 | * | |
564 | * Returns : 0 no ddp | |
565 | */ | |
566 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, | |
567 | struct scatterlist *sgl, unsigned int sgc) | |
568 | { | |
569 | struct net_device *n = fcoe_netdev(lp); | |
570 | ||
571 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup) | |
572 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | * fcoe_ddp_done - calls LLD's ddp_done through net_device | |
579 | * @lp: the corresponding fc_lport | |
580 | * @xid: the exchange id for this ddp transfer | |
581 | * | |
582 | * Returns : the length of data that have been completed by ddp | |
583 | */ | |
584 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) | |
585 | { | |
586 | struct net_device *n = fcoe_netdev(lp); | |
587 | ||
588 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done) | |
589 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static struct libfc_function_template fcoe_libfc_fcn_templ = { | |
594 | .frame_send = fcoe_xmit, | |
595 | .ddp_setup = fcoe_ddp_setup, | |
596 | .ddp_done = fcoe_ddp_done, | |
597 | }; | |
598 | ||
599 | /** | |
600 | * fcoe_if_create() - this function creates the fcoe interface | |
601 | * @netdev: pointer the associated netdevice | |
602 | * | |
603 | * Creates fc_lport struct and scsi_host for lport, configures lport | |
604 | * and starts fabric login. | |
605 | * | |
606 | * Returns : 0 on success | |
607 | */ | |
608 | static int fcoe_if_create(struct net_device *netdev) | |
609 | { | |
610 | int rc; | |
611 | struct fc_lport *lp = NULL; | |
612 | struct fcoe_softc *fc; | |
613 | struct Scsi_Host *shost; | |
614 | ||
615 | BUG_ON(!netdev); | |
616 | ||
d5488eb9 | 617 | FCOE_NETDEV_DBG(netdev, "Create Interface\n"); |
7f349142 VD |
618 | |
619 | lp = fcoe_hostlist_lookup(netdev); | |
620 | if (lp) | |
621 | return -EEXIST; | |
622 | ||
a0a25da2 VD |
623 | shost = libfc_host_alloc(&fcoe_shost_template, |
624 | sizeof(struct fcoe_softc)); | |
7f349142 | 625 | if (!shost) { |
d5488eb9 | 626 | FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); |
7f349142 VD |
627 | return -ENOMEM; |
628 | } | |
629 | lp = shost_priv(shost); | |
630 | fc = lport_priv(lp); | |
631 | ||
632 | /* configure fc_lport, e.g., em */ | |
633 | rc = fcoe_lport_config(lp); | |
634 | if (rc) { | |
d5488eb9 RL |
635 | FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " |
636 | "interface\n"); | |
7f349142 VD |
637 | goto out_host_put; |
638 | } | |
639 | ||
97c8389d JE |
640 | /* |
641 | * Initialize FIP. | |
642 | */ | |
643 | fcoe_ctlr_init(&fc->ctlr); | |
644 | fc->ctlr.send = fcoe_fip_send; | |
645 | fc->ctlr.update_mac = fcoe_update_src_mac; | |
646 | ||
ab6b85c1 VD |
647 | /* configure lport network properties */ |
648 | rc = fcoe_netdev_config(lp, netdev); | |
649 | if (rc) { | |
d5488eb9 RL |
650 | FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " |
651 | "interface\n"); | |
ab6b85c1 VD |
652 | goto out_netdev_cleanup; |
653 | } | |
97c8389d | 654 | |
7f349142 VD |
655 | /* configure lport scsi host properties */ |
656 | rc = fcoe_shost_config(lp, shost, &netdev->dev); | |
657 | if (rc) { | |
d5488eb9 RL |
658 | FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " |
659 | "interface\n"); | |
ab6b85c1 | 660 | goto out_netdev_cleanup; |
7f349142 VD |
661 | } |
662 | ||
96316099 VD |
663 | /* Initialize the library */ |
664 | rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ); | |
7f349142 | 665 | if (rc) { |
96316099 | 666 | FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " |
d5488eb9 | 667 | "interface\n"); |
96316099 | 668 | goto out_lp_destroy; |
7f349142 VD |
669 | } |
670 | ||
e8af4d43 VD |
671 | /* |
672 | * fcoe_em_alloc() and fcoe_hostlist_add() both | |
673 | * need to be atomic under fcoe_hostlist_lock | |
674 | * since fcoe_em_alloc() looks for an existing EM | |
675 | * instance on host list updated by fcoe_hostlist_add(). | |
676 | */ | |
677 | write_lock(&fcoe_hostlist_lock); | |
96316099 VD |
678 | /* lport exch manager allocation */ |
679 | rc = fcoe_em_config(lp); | |
7f349142 | 680 | if (rc) { |
96316099 | 681 | FCOE_NETDEV_DBG(netdev, "Could not configure the EM for the " |
d5488eb9 | 682 | "interface\n"); |
7f349142 VD |
683 | goto out_lp_destroy; |
684 | } | |
685 | ||
686 | /* add to lports list */ | |
687 | fcoe_hostlist_add(lp); | |
e8af4d43 | 688 | write_unlock(&fcoe_hostlist_lock); |
7f349142 VD |
689 | |
690 | lp->boot_time = jiffies; | |
691 | ||
692 | fc_fabric_login(lp); | |
693 | ||
97c8389d JE |
694 | if (!fcoe_link_ok(lp)) |
695 | fcoe_ctlr_link_up(&fc->ctlr); | |
696 | ||
7f349142 VD |
697 | dev_hold(netdev); |
698 | ||
699 | return rc; | |
700 | ||
701 | out_lp_destroy: | |
52ff878c | 702 | fc_exch_mgr_free(lp); |
ab6b85c1 VD |
703 | out_netdev_cleanup: |
704 | fcoe_netdev_cleanup(fc); | |
7f349142 VD |
705 | out_host_put: |
706 | scsi_host_put(lp->host); | |
707 | return rc; | |
708 | } | |
709 | ||
710 | /** | |
711 | * fcoe_if_init() - attach to scsi transport | |
712 | * | |
713 | * Returns : 0 on success | |
714 | */ | |
715 | static int __init fcoe_if_init(void) | |
716 | { | |
717 | /* attach to scsi transport */ | |
718 | scsi_transport_fcoe_sw = | |
719 | fc_attach_transport(&fcoe_transport_function); | |
720 | ||
721 | if (!scsi_transport_fcoe_sw) { | |
d5488eb9 | 722 | printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); |
7f349142 VD |
723 | return -ENODEV; |
724 | } | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | /** | |
730 | * fcoe_if_exit() - detach from scsi transport | |
731 | * | |
732 | * Returns : 0 on success | |
733 | */ | |
734 | int __exit fcoe_if_exit(void) | |
735 | { | |
736 | fc_release_transport(scsi_transport_fcoe_sw); | |
737 | return 0; | |
738 | } | |
739 | ||
8976f424 RL |
740 | /** |
741 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu | |
742 | * @cpu: cpu index for the online cpu | |
743 | */ | |
744 | static void fcoe_percpu_thread_create(unsigned int cpu) | |
745 | { | |
746 | struct fcoe_percpu_s *p; | |
747 | struct task_struct *thread; | |
748 | ||
749 | p = &per_cpu(fcoe_percpu, cpu); | |
750 | ||
751 | thread = kthread_create(fcoe_percpu_receive_thread, | |
752 | (void *)p, "fcoethread/%d", cpu); | |
753 | ||
754 | if (likely(!IS_ERR(p->thread))) { | |
755 | kthread_bind(thread, cpu); | |
756 | wake_up_process(thread); | |
757 | ||
758 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
759 | p->thread = thread; | |
760 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
761 | } | |
762 | } | |
763 | ||
764 | /** | |
765 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu | |
766 | * @cpu: cpu index the rx thread is to be removed | |
767 | * | |
768 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the | |
769 | * current CPU's Rx thread. If the thread being destroyed is bound to | |
770 | * the CPU processing this context the skbs will be freed. | |
771 | */ | |
772 | static void fcoe_percpu_thread_destroy(unsigned int cpu) | |
773 | { | |
774 | struct fcoe_percpu_s *p; | |
775 | struct task_struct *thread; | |
776 | struct page *crc_eof; | |
777 | struct sk_buff *skb; | |
778 | #ifdef CONFIG_SMP | |
779 | struct fcoe_percpu_s *p0; | |
780 | unsigned targ_cpu = smp_processor_id(); | |
781 | #endif /* CONFIG_SMP */ | |
782 | ||
d5488eb9 | 783 | FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); |
8976f424 RL |
784 | |
785 | /* Prevent any new skbs from being queued for this CPU. */ | |
786 | p = &per_cpu(fcoe_percpu, cpu); | |
787 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
788 | thread = p->thread; | |
789 | p->thread = NULL; | |
790 | crc_eof = p->crc_eof_page; | |
791 | p->crc_eof_page = NULL; | |
792 | p->crc_eof_offset = 0; | |
793 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
794 | ||
795 | #ifdef CONFIG_SMP | |
796 | /* | |
797 | * Don't bother moving the skb's if this context is running | |
798 | * on the same CPU that is having its thread destroyed. This | |
799 | * can easily happen when the module is removed. | |
800 | */ | |
801 | if (cpu != targ_cpu) { | |
802 | p0 = &per_cpu(fcoe_percpu, targ_cpu); | |
803 | spin_lock_bh(&p0->fcoe_rx_list.lock); | |
804 | if (p0->thread) { | |
d5488eb9 RL |
805 | FCOE_DBG("Moving frames from CPU %d to CPU %d\n", |
806 | cpu, targ_cpu); | |
8976f424 RL |
807 | |
808 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
809 | __skb_queue_tail(&p0->fcoe_rx_list, skb); | |
810 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
811 | } else { | |
812 | /* | |
813 | * The targeted CPU is not initialized and cannot accept | |
814 | * new skbs. Unlock the targeted CPU and drop the skbs | |
815 | * on the CPU that is going offline. | |
816 | */ | |
817 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
818 | kfree_skb(skb); | |
819 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
820 | } | |
821 | } else { | |
822 | /* | |
823 | * This scenario occurs when the module is being removed | |
824 | * and all threads are being destroyed. skbs will continue | |
825 | * to be shifted from the CPU thread that is being removed | |
826 | * to the CPU thread associated with the CPU that is processing | |
827 | * the module removal. Once there is only one CPU Rx thread it | |
828 | * will reach this case and we will drop all skbs and later | |
829 | * stop the thread. | |
830 | */ | |
831 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
832 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
833 | kfree_skb(skb); | |
834 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
835 | } | |
836 | #else | |
837 | /* | |
dd3fd72e | 838 | * This a non-SMP scenario where the singular Rx thread is |
8976f424 RL |
839 | * being removed. Free all skbs and stop the thread. |
840 | */ | |
841 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
842 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
843 | kfree_skb(skb); | |
844 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
845 | #endif | |
846 | ||
847 | if (thread) | |
848 | kthread_stop(thread); | |
849 | ||
850 | if (crc_eof) | |
851 | put_page(crc_eof); | |
852 | } | |
853 | ||
854 | /** | |
855 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback | |
856 | * @nfb: callback data block | |
857 | * @action: event triggering the callback | |
858 | * @hcpu: index for the cpu of this event | |
859 | * | |
860 | * This creates or destroys per cpu data for fcoe | |
861 | * | |
862 | * Returns NOTIFY_OK always. | |
863 | */ | |
864 | static int fcoe_cpu_callback(struct notifier_block *nfb, | |
865 | unsigned long action, void *hcpu) | |
866 | { | |
867 | unsigned cpu = (unsigned long)hcpu; | |
868 | ||
869 | switch (action) { | |
870 | case CPU_ONLINE: | |
871 | case CPU_ONLINE_FROZEN: | |
d5488eb9 | 872 | FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); |
8976f424 RL |
873 | fcoe_percpu_thread_create(cpu); |
874 | break; | |
875 | case CPU_DEAD: | |
876 | case CPU_DEAD_FROZEN: | |
d5488eb9 | 877 | FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); |
8976f424 RL |
878 | fcoe_percpu_thread_destroy(cpu); |
879 | break; | |
880 | default: | |
881 | break; | |
882 | } | |
883 | return NOTIFY_OK; | |
884 | } | |
885 | ||
886 | static struct notifier_block fcoe_cpu_notifier = { | |
887 | .notifier_call = fcoe_cpu_callback, | |
888 | }; | |
889 | ||
85b4aa49 | 890 | /** |
34f42a07 | 891 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
892 | * @skb: the receive skb |
893 | * @dev: associated net device | |
894 | * @ptype: context | |
dd3fd72e | 895 | * @olddev: last device |
85b4aa49 RL |
896 | * |
897 | * this function will receive the packet and build fc frame and pass it up | |
898 | * | |
899 | * Returns: 0 for success | |
34f42a07 | 900 | */ |
85b4aa49 RL |
901 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
902 | struct packet_type *ptype, struct net_device *olddev) | |
903 | { | |
904 | struct fc_lport *lp; | |
905 | struct fcoe_rcv_info *fr; | |
906 | struct fcoe_softc *fc; | |
85b4aa49 | 907 | struct fc_frame_header *fh; |
85b4aa49 | 908 | struct fcoe_percpu_s *fps; |
38eccabd | 909 | unsigned short oxid; |
8976f424 | 910 | unsigned int cpu = 0; |
85b4aa49 RL |
911 | |
912 | fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); | |
97c8389d | 913 | lp = fc->ctlr.lp; |
85b4aa49 | 914 | if (unlikely(lp == NULL)) { |
d5488eb9 | 915 | FCOE_NETDEV_DBG(dev, "Cannot find hba structure"); |
85b4aa49 RL |
916 | goto err2; |
917 | } | |
97c8389d JE |
918 | if (!lp->link_up) |
919 | goto err2; | |
85b4aa49 | 920 | |
d5488eb9 RL |
921 | FCOE_NETDEV_DBG(dev, "skb_info: len:%d data_len:%d head:%p " |
922 | "data:%p tail:%p end:%p sum:%d dev:%s", | |
923 | skb->len, skb->data_len, skb->head, skb->data, | |
924 | skb_tail_pointer(skb), skb_end_pointer(skb), | |
925 | skb->csum, skb->dev ? skb->dev->name : "<NULL>"); | |
85b4aa49 RL |
926 | |
927 | /* check for FCOE packet type */ | |
928 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
d5488eb9 | 929 | FCOE_NETDEV_DBG(dev, "Wrong FC type frame"); |
85b4aa49 RL |
930 | goto err; |
931 | } | |
932 | ||
933 | /* | |
934 | * Check for minimum frame length, and make sure required FCoE | |
935 | * and FC headers are pulled into the linear data area. | |
936 | */ | |
937 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
938 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
939 | goto err; | |
940 | ||
941 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
942 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
943 | ||
944 | oxid = ntohs(fh->fh_ox_id); | |
945 | ||
946 | fr = fcoe_dev_from_skb(skb); | |
947 | fr->fr_dev = lp; | |
948 | fr->ptype = ptype; | |
5e5e92df | 949 | |
85b4aa49 RL |
950 | #ifdef CONFIG_SMP |
951 | /* | |
952 | * The incoming frame exchange id(oxid) is ANDed with num of online | |
8976f424 RL |
953 | * cpu bits to get cpu and then this cpu is used for selecting |
954 | * a per cpu kernel thread from fcoe_percpu. | |
85b4aa49 | 955 | */ |
8976f424 | 956 | cpu = oxid & (num_online_cpus() - 1); |
85b4aa49 | 957 | #endif |
5e5e92df | 958 | |
8976f424 | 959 | fps = &per_cpu(fcoe_percpu, cpu); |
85b4aa49 | 960 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
8976f424 RL |
961 | if (unlikely(!fps->thread)) { |
962 | /* | |
963 | * The targeted CPU is not ready, let's target | |
964 | * the first CPU now. For non-SMP systems this | |
965 | * will check the same CPU twice. | |
966 | */ | |
d5488eb9 RL |
967 | FCOE_NETDEV_DBG(dev, "CPU is online, but no receive thread " |
968 | "ready for incoming skb- using first online " | |
969 | "CPU.\n"); | |
8976f424 RL |
970 | |
971 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
972 | cpu = first_cpu(cpu_online_map); | |
973 | fps = &per_cpu(fcoe_percpu, cpu); | |
974 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
975 | if (!fps->thread) { | |
976 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
977 | goto err; | |
978 | } | |
979 | } | |
980 | ||
981 | /* | |
982 | * We now have a valid CPU that we're targeting for | |
983 | * this skb. We also have this receive thread locked, | |
984 | * so we're free to queue skbs into it's queue. | |
985 | */ | |
85b4aa49 RL |
986 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
987 | if (fps->fcoe_rx_list.qlen == 1) | |
988 | wake_up_process(fps->thread); | |
989 | ||
990 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
991 | ||
992 | return 0; | |
993 | err: | |
582b45bc | 994 | fc_lport_get_stats(lp)->ErrorFrames++; |
85b4aa49 RL |
995 | |
996 | err2: | |
997 | kfree_skb(skb); | |
998 | return -1; | |
999 | } | |
85b4aa49 RL |
1000 | |
1001 | /** | |
34f42a07 | 1002 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
1003 | * @skb: the skb to be xmitted |
1004 | * | |
1005 | * Returns: 0 for success | |
34f42a07 | 1006 | */ |
85b4aa49 RL |
1007 | static inline int fcoe_start_io(struct sk_buff *skb) |
1008 | { | |
1009 | int rc; | |
1010 | ||
1011 | skb_get(skb); | |
1012 | rc = dev_queue_xmit(skb); | |
1013 | if (rc != 0) | |
1014 | return rc; | |
1015 | kfree_skb(skb); | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | /** | |
dd3fd72e | 1020 | * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof |
85b4aa49 RL |
1021 | * @skb: the skb to be xmitted |
1022 | * @tlen: total len | |
1023 | * | |
1024 | * Returns: 0 for success | |
34f42a07 | 1025 | */ |
85b4aa49 RL |
1026 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
1027 | { | |
1028 | struct fcoe_percpu_s *fps; | |
1029 | struct page *page; | |
85b4aa49 | 1030 | |
5e5e92df | 1031 | fps = &get_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1032 | page = fps->crc_eof_page; |
1033 | if (!page) { | |
1034 | page = alloc_page(GFP_ATOMIC); | |
1035 | if (!page) { | |
5e5e92df | 1036 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1037 | return -ENOMEM; |
1038 | } | |
1039 | fps->crc_eof_page = page; | |
8976f424 | 1040 | fps->crc_eof_offset = 0; |
85b4aa49 RL |
1041 | } |
1042 | ||
1043 | get_page(page); | |
1044 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
1045 | fps->crc_eof_offset, tlen); | |
1046 | skb->len += tlen; | |
1047 | skb->data_len += tlen; | |
1048 | skb->truesize += tlen; | |
1049 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
1050 | ||
1051 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
1052 | fps->crc_eof_page = NULL; | |
1053 | fps->crc_eof_offset = 0; | |
1054 | put_page(page); | |
1055 | } | |
5e5e92df | 1056 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1057 | return 0; |
1058 | } | |
1059 | ||
1060 | /** | |
34f42a07 | 1061 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
dd3fd72e | 1062 | * @fp: the fc_frame containing data to be checksummed |
85b4aa49 RL |
1063 | * |
1064 | * This uses crc32() to calculate the crc for fc frame | |
1065 | * Return : 32 bit crc | |
34f42a07 | 1066 | */ |
85b4aa49 RL |
1067 | u32 fcoe_fc_crc(struct fc_frame *fp) |
1068 | { | |
1069 | struct sk_buff *skb = fp_skb(fp); | |
1070 | struct skb_frag_struct *frag; | |
1071 | unsigned char *data; | |
1072 | unsigned long off, len, clen; | |
1073 | u32 crc; | |
1074 | unsigned i; | |
1075 | ||
1076 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
1077 | ||
1078 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1079 | frag = &skb_shinfo(skb)->frags[i]; | |
1080 | off = frag->page_offset; | |
1081 | len = frag->size; | |
1082 | while (len > 0) { | |
1083 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
1084 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
1085 | KM_SKB_DATA_SOFTIRQ); | |
1086 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
1087 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
1088 | off += clen; | |
1089 | len -= clen; | |
1090 | } | |
1091 | } | |
1092 | return crc; | |
1093 | } | |
85b4aa49 RL |
1094 | |
1095 | /** | |
34f42a07 | 1096 | * fcoe_xmit() - FCoE frame transmit function |
85b4aa49 RL |
1097 | * @lp: the associated local port |
1098 | * @fp: the fc_frame to be transmitted | |
1099 | * | |
1100 | * Return : 0 for success | |
34f42a07 | 1101 | */ |
85b4aa49 RL |
1102 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
1103 | { | |
4bb6b515 | 1104 | int wlen; |
85b4aa49 RL |
1105 | u32 crc; |
1106 | struct ethhdr *eh; | |
1107 | struct fcoe_crc_eof *cp; | |
1108 | struct sk_buff *skb; | |
1109 | struct fcoe_dev_stats *stats; | |
1110 | struct fc_frame_header *fh; | |
1111 | unsigned int hlen; /* header length implies the version */ | |
1112 | unsigned int tlen; /* trailer length */ | |
1113 | unsigned int elen; /* eth header, may include vlan */ | |
85b4aa49 RL |
1114 | struct fcoe_softc *fc; |
1115 | u8 sof, eof; | |
1116 | struct fcoe_hdr *hp; | |
1117 | ||
1118 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
1119 | ||
fc47ff6b | 1120 | fc = lport_priv(lp); |
85b4aa49 | 1121 | fh = fc_frame_header_get(fp); |
97c8389d JE |
1122 | skb = fp_skb(fp); |
1123 | wlen = skb->len / FCOE_WORD_TO_BYTE; | |
1124 | ||
1125 | if (!lp->link_up) { | |
3caf02ee | 1126 | kfree_skb(skb); |
97c8389d | 1127 | return 0; |
85b4aa49 RL |
1128 | } |
1129 | ||
97c8389d JE |
1130 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) && |
1131 | fcoe_ctlr_els_send(&fc->ctlr, skb)) | |
1132 | return 0; | |
1133 | ||
85b4aa49 RL |
1134 | sof = fr_sof(fp); |
1135 | eof = fr_eof(fp); | |
1136 | ||
4e57e1cb | 1137 | elen = sizeof(struct ethhdr); |
85b4aa49 RL |
1138 | hlen = sizeof(struct fcoe_hdr); |
1139 | tlen = sizeof(struct fcoe_crc_eof); | |
1140 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
1141 | ||
1142 | /* crc offload */ | |
1143 | if (likely(lp->crc_offload)) { | |
39ca9a06 | 1144 | skb->ip_summed = CHECKSUM_PARTIAL; |
85b4aa49 RL |
1145 | skb->csum_start = skb_headroom(skb); |
1146 | skb->csum_offset = skb->len; | |
1147 | crc = 0; | |
1148 | } else { | |
1149 | skb->ip_summed = CHECKSUM_NONE; | |
1150 | crc = fcoe_fc_crc(fp); | |
1151 | } | |
1152 | ||
1153 | /* copy fc crc and eof to the skb buff */ | |
1154 | if (skb_is_nonlinear(skb)) { | |
1155 | skb_frag_t *frag; | |
1156 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 1157 | kfree_skb(skb); |
85b4aa49 RL |
1158 | return -ENOMEM; |
1159 | } | |
1160 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
1161 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
1162 | + frag->page_offset; | |
1163 | } else { | |
1164 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
1165 | } | |
1166 | ||
1167 | memset(cp, 0, sizeof(*cp)); | |
1168 | cp->fcoe_eof = eof; | |
1169 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
1170 | ||
1171 | if (skb_is_nonlinear(skb)) { | |
1172 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
1173 | cp = NULL; | |
1174 | } | |
1175 | ||
dd3fd72e | 1176 | /* adjust skb network/transport offsets to match mac/fcoe/fc */ |
85b4aa49 RL |
1177 | skb_push(skb, elen + hlen); |
1178 | skb_reset_mac_header(skb); | |
1179 | skb_reset_network_header(skb); | |
1180 | skb->mac_len = elen; | |
211c738d | 1181 | skb->protocol = htons(ETH_P_FCOE); |
85b4aa49 RL |
1182 | skb->dev = fc->real_dev; |
1183 | ||
1184 | /* fill up mac and fcoe headers */ | |
1185 | eh = eth_hdr(skb); | |
1186 | eh->h_proto = htons(ETH_P_FCOE); | |
97c8389d | 1187 | if (fc->ctlr.map_dest) |
85b4aa49 RL |
1188 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); |
1189 | else | |
1190 | /* insert GW address */ | |
97c8389d | 1191 | memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN); |
85b4aa49 | 1192 | |
97c8389d JE |
1193 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
1194 | memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN); | |
85b4aa49 | 1195 | else |
97c8389d | 1196 | memcpy(eh->h_source, fc->ctlr.data_src_addr, ETH_ALEN); |
85b4aa49 RL |
1197 | |
1198 | hp = (struct fcoe_hdr *)(eh + 1); | |
1199 | memset(hp, 0, sizeof(*hp)); | |
1200 | if (FC_FCOE_VER) | |
1201 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
1202 | hp->fcoe_sof = sof; | |
1203 | ||
39ca9a06 YZ |
1204 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ |
1205 | if (lp->seq_offload && fr_max_payload(fp)) { | |
1206 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; | |
1207 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); | |
1208 | } else { | |
1209 | skb_shinfo(skb)->gso_type = 0; | |
1210 | skb_shinfo(skb)->gso_size = 0; | |
1211 | } | |
85b4aa49 | 1212 | /* update tx stats: regardless if LLD fails */ |
582b45bc RL |
1213 | stats = fc_lport_get_stats(lp); |
1214 | stats->TxFrames++; | |
1215 | stats->TxWords += wlen; | |
85b4aa49 RL |
1216 | |
1217 | /* send down to lld */ | |
1218 | fr_dev(fp) = lp; | |
1219 | if (fc->fcoe_pending_queue.qlen) | |
4bb6b515 VD |
1220 | fcoe_check_wait_queue(lp, skb); |
1221 | else if (fcoe_start_io(skb)) | |
1222 | fcoe_check_wait_queue(lp, skb); | |
85b4aa49 RL |
1223 | |
1224 | return 0; | |
1225 | } | |
85b4aa49 | 1226 | |
34f42a07 RL |
1227 | /** |
1228 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
1229 | * @arg: ptr to the fcoe per cpu struct |
1230 | * | |
1231 | * Return: 0 for success | |
85b4aa49 RL |
1232 | */ |
1233 | int fcoe_percpu_receive_thread(void *arg) | |
1234 | { | |
1235 | struct fcoe_percpu_s *p = arg; | |
1236 | u32 fr_len; | |
1237 | struct fc_lport *lp; | |
1238 | struct fcoe_rcv_info *fr; | |
1239 | struct fcoe_dev_stats *stats; | |
1240 | struct fc_frame_header *fh; | |
1241 | struct sk_buff *skb; | |
1242 | struct fcoe_crc_eof crc_eof; | |
1243 | struct fc_frame *fp; | |
1244 | u8 *mac = NULL; | |
1245 | struct fcoe_softc *fc; | |
1246 | struct fcoe_hdr *hp; | |
1247 | ||
4469c195 | 1248 | set_user_nice(current, -20); |
85b4aa49 RL |
1249 | |
1250 | while (!kthread_should_stop()) { | |
1251 | ||
1252 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1253 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
1254 | set_current_state(TASK_INTERRUPTIBLE); | |
1255 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1256 | schedule(); | |
1257 | set_current_state(TASK_RUNNING); | |
1258 | if (kthread_should_stop()) | |
1259 | return 0; | |
1260 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1261 | } | |
1262 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1263 | fr = fcoe_dev_from_skb(skb); | |
1264 | lp = fr->fr_dev; | |
1265 | if (unlikely(lp == NULL)) { | |
d5488eb9 | 1266 | FCOE_NETDEV_DBG(skb->dev, "Invalid HBA Structure"); |
85b4aa49 RL |
1267 | kfree_skb(skb); |
1268 | continue; | |
1269 | } | |
1270 | ||
d5488eb9 RL |
1271 | FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d " |
1272 | "head:%p data:%p tail:%p end:%p sum:%d dev:%s", | |
1273 | skb->len, skb->data_len, | |
1274 | skb->head, skb->data, skb_tail_pointer(skb), | |
1275 | skb_end_pointer(skb), skb->csum, | |
1276 | skb->dev ? skb->dev->name : "<NULL>"); | |
85b4aa49 RL |
1277 | |
1278 | /* | |
1279 | * Save source MAC address before discarding header. | |
1280 | */ | |
1281 | fc = lport_priv(lp); | |
85b4aa49 RL |
1282 | if (skb_is_nonlinear(skb)) |
1283 | skb_linearize(skb); /* not ideal */ | |
97c8389d | 1284 | mac = eth_hdr(skb)->h_source; |
85b4aa49 RL |
1285 | |
1286 | /* | |
1287 | * Frame length checks and setting up the header pointers | |
1288 | * was done in fcoe_rcv already. | |
1289 | */ | |
1290 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
1291 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1292 | ||
582b45bc | 1293 | stats = fc_lport_get_stats(lp); |
85b4aa49 | 1294 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
582b45bc | 1295 | if (stats->ErrorFrames < 5) |
d5488eb9 | 1296 | printk(KERN_WARNING "fcoe: FCoE version " |
582b45bc RL |
1297 | "mismatch: The frame has " |
1298 | "version %x, but the " | |
1299 | "initiator supports version " | |
1300 | "%x\n", FC_FCOE_DECAPS_VER(hp), | |
1301 | FC_FCOE_VER); | |
1302 | stats->ErrorFrames++; | |
85b4aa49 RL |
1303 | kfree_skb(skb); |
1304 | continue; | |
1305 | } | |
1306 | ||
1307 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
1308 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
1309 | ||
582b45bc RL |
1310 | stats->RxFrames++; |
1311 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
85b4aa49 RL |
1312 | |
1313 | fp = (struct fc_frame *)skb; | |
1314 | fc_frame_init(fp); | |
1315 | fr_dev(fp) = lp; | |
1316 | fr_sof(fp) = hp->fcoe_sof; | |
1317 | ||
1318 | /* Copy out the CRC and EOF trailer for access */ | |
1319 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
1320 | kfree_skb(skb); | |
1321 | continue; | |
1322 | } | |
1323 | fr_eof(fp) = crc_eof.fcoe_eof; | |
1324 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
1325 | if (pskb_trim(skb, fr_len)) { | |
1326 | kfree_skb(skb); | |
1327 | continue; | |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * We only check CRC if no offload is available and if it is | |
1332 | * it's solicited data, in which case, the FCP layer would | |
1333 | * check it during the copy. | |
1334 | */ | |
07c00ec4 | 1335 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
85b4aa49 RL |
1336 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
1337 | else | |
1338 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
1339 | ||
1340 | fh = fc_frame_header_get(fp); | |
1341 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
1342 | fh->fh_type == FC_TYPE_FCP) { | |
52ff878c | 1343 | fc_exch_recv(lp, fp); |
85b4aa49 RL |
1344 | continue; |
1345 | } | |
1346 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
1347 | if (le32_to_cpu(fr_crc(fp)) != | |
1348 | ~crc32(~0, skb->data, fr_len)) { | |
d5488eb9 | 1349 | if (stats->InvalidCRCCount < 5) |
85b4aa49 RL |
1350 | printk(KERN_WARNING "fcoe: dropping " |
1351 | "frame with CRC error\n"); | |
1352 | stats->InvalidCRCCount++; | |
1353 | stats->ErrorFrames++; | |
1354 | fc_frame_free(fp); | |
1355 | continue; | |
1356 | } | |
1357 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
1358 | } | |
97c8389d JE |
1359 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) && |
1360 | fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) { | |
1361 | fc_frame_free(fp); | |
1362 | continue; | |
1363 | } | |
52ff878c | 1364 | fc_exch_recv(lp, fp); |
85b4aa49 RL |
1365 | } |
1366 | return 0; | |
1367 | } | |
1368 | ||
85b4aa49 | 1369 | /** |
dd3fd72e CL |
1370 | * fcoe_check_wait_queue() - attempt to clear the transmit backlog |
1371 | * @lp: the fc_lport | |
85b4aa49 RL |
1372 | * |
1373 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
1374 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 | 1375 | * transmitted, return qlen or -1 if a error occurs, then restore |
dd3fd72e | 1376 | * wait_queue and try again later. |
85b4aa49 RL |
1377 | * |
1378 | * The wait_queue is used when the skb transmit fails. skb will go | |
dd3fd72e | 1379 | * in the wait_queue which will be emptied by the timer function or |
85b4aa49 | 1380 | * by the next skb transmit. |
34f42a07 | 1381 | */ |
4bb6b515 | 1382 | static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb) |
85b4aa49 | 1383 | { |
55c8bafb | 1384 | struct fcoe_softc *fc = lport_priv(lp); |
4bb6b515 | 1385 | int rc; |
85b4aa49 | 1386 | |
85b4aa49 | 1387 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
4bb6b515 VD |
1388 | |
1389 | if (skb) | |
1390 | __skb_queue_tail(&fc->fcoe_pending_queue, skb); | |
1391 | ||
c826a314 VD |
1392 | if (fc->fcoe_pending_queue_active) |
1393 | goto out; | |
1394 | fc->fcoe_pending_queue_active = 1; | |
55c8bafb CL |
1395 | |
1396 | while (fc->fcoe_pending_queue.qlen) { | |
1397 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
1398 | fc->fcoe_pending_queue.qlen++; | |
1399 | skb = __skb_dequeue(&fc->fcoe_pending_queue); | |
1400 | ||
1401 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1402 | rc = fcoe_start_io(skb); | |
1403 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1404 | ||
1405 | if (rc) { | |
1406 | __skb_queue_head(&fc->fcoe_pending_queue, skb); | |
1407 | /* undo temporary increment above */ | |
1408 | fc->fcoe_pending_queue.qlen--; | |
1409 | break; | |
85b4aa49 | 1410 | } |
55c8bafb CL |
1411 | /* undo temporary increment above */ |
1412 | fc->fcoe_pending_queue.qlen--; | |
85b4aa49 | 1413 | } |
55c8bafb CL |
1414 | |
1415 | if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) | |
1416 | lp->qfull = 0; | |
1047f221 VD |
1417 | if (fc->fcoe_pending_queue.qlen && !timer_pending(&fc->timer)) |
1418 | mod_timer(&fc->timer, jiffies + 2); | |
c826a314 | 1419 | fc->fcoe_pending_queue_active = 0; |
c826a314 | 1420 | out: |
4bb6b515 VD |
1421 | if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
1422 | lp->qfull = 1; | |
85b4aa49 | 1423 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
4bb6b515 | 1424 | return; |
85b4aa49 RL |
1425 | } |
1426 | ||
85b4aa49 | 1427 | /** |
34f42a07 RL |
1428 | * fcoe_dev_setup() - setup link change notification interface |
1429 | */ | |
b0d428ad | 1430 | static void fcoe_dev_setup(void) |
85b4aa49 | 1431 | { |
85b4aa49 RL |
1432 | register_netdevice_notifier(&fcoe_notifier); |
1433 | } | |
1434 | ||
1435 | /** | |
b0d428ad | 1436 | * fcoe_dev_cleanup() - cleanup link change notification interface |
34f42a07 | 1437 | */ |
85b4aa49 RL |
1438 | static void fcoe_dev_cleanup(void) |
1439 | { | |
1440 | unregister_netdevice_notifier(&fcoe_notifier); | |
1441 | } | |
1442 | ||
1443 | /** | |
34f42a07 | 1444 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
1445 | * @notifier: context of the notification |
1446 | * @event: type of event | |
1447 | * @ptr: fixed array for output parsed ifname | |
1448 | * | |
1449 | * This function is called by the ethernet driver in case of link change event | |
1450 | * | |
1451 | * Returns: 0 for success | |
34f42a07 | 1452 | */ |
85b4aa49 RL |
1453 | static int fcoe_device_notification(struct notifier_block *notifier, |
1454 | ulong event, void *ptr) | |
1455 | { | |
1456 | struct fc_lport *lp = NULL; | |
1457 | struct net_device *real_dev = ptr; | |
1458 | struct fcoe_softc *fc; | |
1459 | struct fcoe_dev_stats *stats; | |
97c8389d | 1460 | u32 link_possible = 1; |
85b4aa49 RL |
1461 | u32 mfs; |
1462 | int rc = NOTIFY_OK; | |
1463 | ||
1464 | read_lock(&fcoe_hostlist_lock); | |
1465 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1466 | if (fc->real_dev == real_dev) { | |
97c8389d | 1467 | lp = fc->ctlr.lp; |
85b4aa49 RL |
1468 | break; |
1469 | } | |
1470 | } | |
1471 | read_unlock(&fcoe_hostlist_lock); | |
1472 | if (lp == NULL) { | |
1473 | rc = NOTIFY_DONE; | |
1474 | goto out; | |
1475 | } | |
1476 | ||
85b4aa49 RL |
1477 | switch (event) { |
1478 | case NETDEV_DOWN: | |
1479 | case NETDEV_GOING_DOWN: | |
97c8389d | 1480 | link_possible = 0; |
85b4aa49 RL |
1481 | break; |
1482 | case NETDEV_UP: | |
1483 | case NETDEV_CHANGE: | |
85b4aa49 RL |
1484 | break; |
1485 | case NETDEV_CHANGEMTU: | |
1486 | mfs = fc->real_dev->mtu - | |
1487 | (sizeof(struct fcoe_hdr) + | |
1488 | sizeof(struct fcoe_crc_eof)); | |
1489 | if (mfs >= FC_MIN_MAX_FRAME) | |
1490 | fc_set_mfs(lp, mfs); | |
85b4aa49 RL |
1491 | break; |
1492 | case NETDEV_REGISTER: | |
1493 | break; | |
1494 | default: | |
d5488eb9 RL |
1495 | FCOE_NETDEV_DBG(real_dev, "Unknown event %ld " |
1496 | "from netdev netlink\n", event); | |
85b4aa49 | 1497 | } |
97c8389d JE |
1498 | if (link_possible && !fcoe_link_ok(lp)) |
1499 | fcoe_ctlr_link_up(&fc->ctlr); | |
1500 | else if (fcoe_ctlr_link_down(&fc->ctlr)) { | |
1501 | stats = fc_lport_get_stats(lp); | |
1502 | stats->LinkFailureCount++; | |
1503 | fcoe_clean_pending_queue(lp); | |
85b4aa49 RL |
1504 | } |
1505 | out: | |
1506 | return rc; | |
1507 | } | |
1508 | ||
1509 | /** | |
34f42a07 | 1510 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
1511 | * @buffer: incoming buffer to be copied |
1512 | * | |
dd3fd72e | 1513 | * Returns: NULL or ptr to net_device |
34f42a07 | 1514 | */ |
85b4aa49 RL |
1515 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
1516 | { | |
1517 | char *cp; | |
1518 | char ifname[IFNAMSIZ + 2]; | |
1519 | ||
1520 | if (buffer) { | |
1521 | strlcpy(ifname, buffer, IFNAMSIZ); | |
1522 | cp = ifname + strlen(ifname); | |
1523 | while (--cp >= ifname && *cp == '\n') | |
1524 | *cp = '\0'; | |
1525 | return dev_get_by_name(&init_net, ifname); | |
1526 | } | |
1527 | return NULL; | |
1528 | } | |
1529 | ||
1530 | /** | |
dd3fd72e | 1531 | * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev |
85b4aa49 RL |
1532 | * @netdev: the target netdev |
1533 | * | |
1534 | * Returns: ptr to the struct module, NULL for failure | |
34f42a07 | 1535 | */ |
b2ab99c9 RL |
1536 | static struct module * |
1537 | fcoe_netdev_to_module_owner(const struct net_device *netdev) | |
85b4aa49 RL |
1538 | { |
1539 | struct device *dev; | |
1540 | ||
1541 | if (!netdev) | |
1542 | return NULL; | |
1543 | ||
1544 | dev = netdev->dev.parent; | |
1545 | if (!dev) | |
1546 | return NULL; | |
1547 | ||
1548 | if (!dev->driver) | |
1549 | return NULL; | |
1550 | ||
1551 | return dev->driver->owner; | |
1552 | } | |
1553 | ||
1554 | /** | |
34f42a07 | 1555 | * fcoe_ethdrv_get() - Hold the Ethernet driver |
85b4aa49 RL |
1556 | * @netdev: the target netdev |
1557 | * | |
34f42a07 RL |
1558 | * Holds the Ethernet driver module by try_module_get() for |
1559 | * the corresponding netdev. | |
1560 | * | |
dd3fd72e | 1561 | * Returns: 0 for success |
34f42a07 | 1562 | */ |
85b4aa49 RL |
1563 | static int fcoe_ethdrv_get(const struct net_device *netdev) |
1564 | { | |
1565 | struct module *owner; | |
1566 | ||
1567 | owner = fcoe_netdev_to_module_owner(netdev); | |
1568 | if (owner) { | |
d5488eb9 RL |
1569 | FCOE_NETDEV_DBG(netdev, "Hold driver module %s\n", |
1570 | module_name(owner)); | |
85b4aa49 RL |
1571 | return try_module_get(owner); |
1572 | } | |
1573 | return -ENODEV; | |
1574 | } | |
1575 | ||
1576 | /** | |
34f42a07 | 1577 | * fcoe_ethdrv_put() - Release the Ethernet driver |
85b4aa49 RL |
1578 | * @netdev: the target netdev |
1579 | * | |
34f42a07 RL |
1580 | * Releases the Ethernet driver module by module_put for |
1581 | * the corresponding netdev. | |
1582 | * | |
dd3fd72e | 1583 | * Returns: 0 for success |
34f42a07 | 1584 | */ |
85b4aa49 RL |
1585 | static int fcoe_ethdrv_put(const struct net_device *netdev) |
1586 | { | |
1587 | struct module *owner; | |
1588 | ||
1589 | owner = fcoe_netdev_to_module_owner(netdev); | |
1590 | if (owner) { | |
d5488eb9 RL |
1591 | FCOE_NETDEV_DBG(netdev, "Release driver module %s\n", |
1592 | module_name(owner)); | |
85b4aa49 RL |
1593 | module_put(owner); |
1594 | return 0; | |
1595 | } | |
1596 | return -ENODEV; | |
1597 | } | |
1598 | ||
1599 | /** | |
34f42a07 | 1600 | * fcoe_destroy() - handles the destroy from sysfs |
dd3fd72e | 1601 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1602 | * @kp: associated kernel param |
1603 | * | |
1604 | * Returns: 0 for success | |
34f42a07 | 1605 | */ |
85b4aa49 RL |
1606 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
1607 | { | |
1608 | int rc; | |
1609 | struct net_device *netdev; | |
1610 | ||
1611 | netdev = fcoe_if_to_netdev(buffer); | |
1612 | if (!netdev) { | |
1613 | rc = -ENODEV; | |
1614 | goto out_nodev; | |
1615 | } | |
1616 | /* look for existing lport */ | |
1617 | if (!fcoe_hostlist_lookup(netdev)) { | |
1618 | rc = -ENODEV; | |
1619 | goto out_putdev; | |
1620 | } | |
7f349142 | 1621 | rc = fcoe_if_destroy(netdev); |
85b4aa49 | 1622 | if (rc) { |
d5488eb9 | 1623 | printk(KERN_ERR "fcoe: Failed to destroy interface (%s)\n", |
85b4aa49 RL |
1624 | netdev->name); |
1625 | rc = -EIO; | |
1626 | goto out_putdev; | |
1627 | } | |
1628 | fcoe_ethdrv_put(netdev); | |
1629 | rc = 0; | |
1630 | out_putdev: | |
1631 | dev_put(netdev); | |
1632 | out_nodev: | |
1633 | return rc; | |
1634 | } | |
1635 | ||
1636 | /** | |
34f42a07 | 1637 | * fcoe_create() - Handles the create call from sysfs |
dd3fd72e | 1638 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1639 | * @kp: associated kernel param |
1640 | * | |
1641 | * Returns: 0 for success | |
34f42a07 | 1642 | */ |
85b4aa49 RL |
1643 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1644 | { | |
1645 | int rc; | |
1646 | struct net_device *netdev; | |
1647 | ||
1648 | netdev = fcoe_if_to_netdev(buffer); | |
1649 | if (!netdev) { | |
1650 | rc = -ENODEV; | |
1651 | goto out_nodev; | |
1652 | } | |
1653 | /* look for existing lport */ | |
1654 | if (fcoe_hostlist_lookup(netdev)) { | |
1655 | rc = -EEXIST; | |
1656 | goto out_putdev; | |
1657 | } | |
1658 | fcoe_ethdrv_get(netdev); | |
1659 | ||
7f349142 | 1660 | rc = fcoe_if_create(netdev); |
85b4aa49 | 1661 | if (rc) { |
d5488eb9 | 1662 | printk(KERN_ERR "fcoe: Failed to create interface (%s)\n", |
85b4aa49 RL |
1663 | netdev->name); |
1664 | fcoe_ethdrv_put(netdev); | |
1665 | rc = -EIO; | |
1666 | goto out_putdev; | |
1667 | } | |
1668 | rc = 0; | |
1669 | out_putdev: | |
1670 | dev_put(netdev); | |
1671 | out_nodev: | |
1672 | return rc; | |
1673 | } | |
1674 | ||
1675 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1676 | __MODULE_PARM_TYPE(create, "string"); | |
1677 | MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); | |
1678 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); | |
1679 | __MODULE_PARM_TYPE(destroy, "string"); | |
1680 | MODULE_PARM_DESC(destroy, "Destroy fcoe port"); | |
1681 | ||
34f42a07 RL |
1682 | /** |
1683 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1684 | * @lp: ptr to the fc_lport |
1685 | * | |
1686 | * Any permanently-disqualifying conditions have been previously checked. | |
1687 | * This also updates the speed setting, which may change with link for 100/1000. | |
1688 | * | |
1689 | * This function should probably be checking for PAUSE support at some point | |
1690 | * in the future. Currently Per-priority-pause is not determinable using | |
1691 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1692 | * | |
1693 | * Returns: 0 if link is OK for use by FCoE. | |
1694 | * | |
1695 | */ | |
1696 | int fcoe_link_ok(struct fc_lport *lp) | |
1697 | { | |
fc47ff6b | 1698 | struct fcoe_softc *fc = lport_priv(lp); |
85b4aa49 RL |
1699 | struct net_device *dev = fc->real_dev; |
1700 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; | |
85b4aa49 | 1701 | |
2f718d64 YZ |
1702 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && |
1703 | (!dev_ethtool_get_settings(dev, &ecmd))) { | |
1704 | lp->link_supported_speeds &= | |
1705 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1706 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1707 | SUPPORTED_1000baseT_Full)) | |
1708 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1709 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1710 | lp->link_supported_speeds |= | |
1711 | FC_PORTSPEED_10GBIT; | |
1712 | if (ecmd.speed == SPEED_1000) | |
1713 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1714 | if (ecmd.speed == SPEED_10000) | |
1715 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
85b4aa49 | 1716 | |
2f718d64 YZ |
1717 | return 0; |
1718 | } | |
1719 | return -1; | |
85b4aa49 | 1720 | } |
85b4aa49 | 1721 | |
34f42a07 RL |
1722 | /** |
1723 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 RL |
1724 | * @lp: the fc_lport |
1725 | */ | |
1726 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1727 | { | |
85b4aa49 RL |
1728 | struct fcoe_percpu_s *pp; |
1729 | struct fcoe_rcv_info *fr; | |
1730 | struct sk_buff_head *list; | |
1731 | struct sk_buff *skb, *next; | |
1732 | struct sk_buff *head; | |
5e5e92df | 1733 | unsigned int cpu; |
85b4aa49 | 1734 | |
5e5e92df RL |
1735 | for_each_possible_cpu(cpu) { |
1736 | pp = &per_cpu(fcoe_percpu, cpu); | |
1737 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1738 | list = &pp->fcoe_rx_list; | |
1739 | head = list->next; | |
1740 | for (skb = head; skb != (struct sk_buff *)list; | |
1741 | skb = next) { | |
1742 | next = skb->next; | |
1743 | fr = fcoe_dev_from_skb(skb); | |
1744 | if (fr->fr_dev == lp) { | |
1745 | __skb_unlink(skb, list); | |
1746 | kfree_skb(skb); | |
85b4aa49 | 1747 | } |
85b4aa49 | 1748 | } |
5e5e92df | 1749 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
85b4aa49 RL |
1750 | } |
1751 | } | |
85b4aa49 RL |
1752 | |
1753 | /** | |
34f42a07 | 1754 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1755 | * @lp: the corresponding fc_lport |
1756 | * | |
1757 | * Returns: none | |
34f42a07 | 1758 | */ |
85b4aa49 RL |
1759 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1760 | { | |
1761 | struct fcoe_softc *fc = lport_priv(lp); | |
1762 | struct sk_buff *skb; | |
1763 | ||
1764 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1765 | while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { | |
1766 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1767 | kfree_skb(skb); | |
1768 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1769 | } | |
1770 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1771 | } | |
85b4aa49 | 1772 | |
34f42a07 RL |
1773 | /** |
1774 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
1775 | * @shost: shost the reset is from |
1776 | * | |
1777 | * Returns: always 0 | |
1778 | */ | |
1779 | int fcoe_reset(struct Scsi_Host *shost) | |
1780 | { | |
1781 | struct fc_lport *lport = shost_priv(shost); | |
1782 | fc_lport_reset(lport); | |
1783 | return 0; | |
1784 | } | |
85b4aa49 | 1785 | |
34f42a07 RL |
1786 | /** |
1787 | * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device | |
dd3fd72e | 1788 | * @dev: this is currently ptr to net_device |
85b4aa49 | 1789 | * |
e8af4d43 VD |
1790 | * Called with fcoe_hostlist_lock held. |
1791 | * | |
85b4aa49 RL |
1792 | * Returns: NULL or the located fcoe_softc |
1793 | */ | |
b2ab99c9 RL |
1794 | static struct fcoe_softc * |
1795 | fcoe_hostlist_lookup_softc(const struct net_device *dev) | |
85b4aa49 RL |
1796 | { |
1797 | struct fcoe_softc *fc; | |
1798 | ||
85b4aa49 | 1799 | list_for_each_entry(fc, &fcoe_hostlist, list) { |
e8af4d43 | 1800 | if (fc->real_dev == dev) |
85b4aa49 | 1801 | return fc; |
85b4aa49 | 1802 | } |
85b4aa49 RL |
1803 | return NULL; |
1804 | } | |
1805 | ||
34f42a07 RL |
1806 | /** |
1807 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
1808 | * @netdev: ptr to net_device |
1809 | * | |
1810 | * Returns: 0 for success | |
1811 | */ | |
1812 | struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) | |
1813 | { | |
1814 | struct fcoe_softc *fc; | |
1815 | ||
e8af4d43 | 1816 | read_lock(&fcoe_hostlist_lock); |
85b4aa49 | 1817 | fc = fcoe_hostlist_lookup_softc(netdev); |
e8af4d43 | 1818 | read_unlock(&fcoe_hostlist_lock); |
85b4aa49 | 1819 | |
97c8389d | 1820 | return (fc) ? fc->ctlr.lp : NULL; |
85b4aa49 | 1821 | } |
85b4aa49 | 1822 | |
34f42a07 RL |
1823 | /** |
1824 | * fcoe_hostlist_add() - Add a lport to lports list | |
dd3fd72e | 1825 | * @lp: ptr to the fc_lport to be added |
85b4aa49 | 1826 | * |
e8af4d43 VD |
1827 | * Called with write fcoe_hostlist_lock held. |
1828 | * | |
85b4aa49 RL |
1829 | * Returns: 0 for success |
1830 | */ | |
1831 | int fcoe_hostlist_add(const struct fc_lport *lp) | |
1832 | { | |
1833 | struct fcoe_softc *fc; | |
1834 | ||
1835 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1836 | if (!fc) { | |
fc47ff6b | 1837 | fc = lport_priv(lp); |
85b4aa49 | 1838 | list_add_tail(&fc->list, &fcoe_hostlist); |
85b4aa49 RL |
1839 | } |
1840 | return 0; | |
1841 | } | |
85b4aa49 | 1842 | |
34f42a07 RL |
1843 | /** |
1844 | * fcoe_hostlist_remove() - remove a lport from lports list | |
dd3fd72e | 1845 | * @lp: ptr to the fc_lport to be removed |
85b4aa49 RL |
1846 | * |
1847 | * Returns: 0 for success | |
1848 | */ | |
1849 | int fcoe_hostlist_remove(const struct fc_lport *lp) | |
1850 | { | |
1851 | struct fcoe_softc *fc; | |
1852 | ||
e8af4d43 | 1853 | write_lock_bh(&fcoe_hostlist_lock); |
85b4aa49 RL |
1854 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); |
1855 | BUG_ON(!fc); | |
85b4aa49 RL |
1856 | list_del(&fc->list); |
1857 | write_unlock_bh(&fcoe_hostlist_lock); | |
1858 | ||
1859 | return 0; | |
1860 | } | |
85b4aa49 | 1861 | |
85b4aa49 | 1862 | /** |
34f42a07 | 1863 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 | 1864 | * |
85b4aa49 | 1865 | * Returns 0 on success, negative on failure |
34f42a07 | 1866 | */ |
85b4aa49 RL |
1867 | static int __init fcoe_init(void) |
1868 | { | |
38eccabd | 1869 | unsigned int cpu; |
8976f424 | 1870 | int rc = 0; |
85b4aa49 RL |
1871 | struct fcoe_percpu_s *p; |
1872 | ||
85b4aa49 RL |
1873 | INIT_LIST_HEAD(&fcoe_hostlist); |
1874 | rwlock_init(&fcoe_hostlist_lock); | |
1875 | ||
38eccabd | 1876 | for_each_possible_cpu(cpu) { |
5e5e92df | 1877 | p = &per_cpu(fcoe_percpu, cpu); |
38eccabd RL |
1878 | skb_queue_head_init(&p->fcoe_rx_list); |
1879 | } | |
1880 | ||
8976f424 RL |
1881 | for_each_online_cpu(cpu) |
1882 | fcoe_percpu_thread_create(cpu); | |
85b4aa49 | 1883 | |
8976f424 RL |
1884 | /* Initialize per CPU interrupt thread */ |
1885 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); | |
1886 | if (rc) | |
1887 | goto out_free; | |
85b4aa49 | 1888 | |
8976f424 | 1889 | /* Setup link change notification */ |
85b4aa49 RL |
1890 | fcoe_dev_setup(); |
1891 | ||
7f349142 | 1892 | fcoe_if_init(); |
85b4aa49 RL |
1893 | |
1894 | return 0; | |
8976f424 RL |
1895 | |
1896 | out_free: | |
1897 | for_each_online_cpu(cpu) { | |
1898 | fcoe_percpu_thread_destroy(cpu); | |
1899 | } | |
1900 | ||
1901 | return rc; | |
85b4aa49 RL |
1902 | } |
1903 | module_init(fcoe_init); | |
1904 | ||
1905 | /** | |
34f42a07 | 1906 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
1907 | * |
1908 | * Returns 0 on success, negative on failure | |
34f42a07 | 1909 | */ |
85b4aa49 RL |
1910 | static void __exit fcoe_exit(void) |
1911 | { | |
5e5e92df | 1912 | unsigned int cpu; |
85b4aa49 | 1913 | struct fcoe_softc *fc, *tmp; |
85b4aa49 | 1914 | |
85b4aa49 RL |
1915 | fcoe_dev_cleanup(); |
1916 | ||
5919a595 | 1917 | /* releases the associated fcoe hosts */ |
85b4aa49 | 1918 | list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
7f349142 | 1919 | fcoe_if_destroy(fc->real_dev); |
85b4aa49 | 1920 | |
8976f424 RL |
1921 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
1922 | ||
1923 | for_each_online_cpu(cpu) { | |
1924 | fcoe_percpu_thread_destroy(cpu); | |
85b4aa49 RL |
1925 | } |
1926 | ||
7f349142 VD |
1927 | /* detach from scsi transport */ |
1928 | fcoe_if_exit(); | |
85b4aa49 RL |
1929 | } |
1930 | module_exit(fcoe_exit); |