Commit | Line | Data |
---|---|---|
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 | 51 | |
05cc7390 YZ |
52 | /* Performance tuning parameters for fcoe */ |
53 | static unsigned int fcoe_ddp_min; | |
54 | module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR); | |
55 | MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \ | |
56 | "Direct Data Placement (DDP)."); | |
57 | ||
85b4aa49 RL |
58 | /* fcoe host list */ |
59 | LIST_HEAD(fcoe_hostlist); | |
60 | DEFINE_RWLOCK(fcoe_hostlist_lock); | |
5e5e92df | 61 | DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
85b4aa49 | 62 | |
dd3fd72e | 63 | /* Function Prototypes */ |
fdd78027 VD |
64 | static int fcoe_reset(struct Scsi_Host *shost); |
65 | static int fcoe_xmit(struct fc_lport *, struct fc_frame *); | |
66 | static int fcoe_rcv(struct sk_buff *, struct net_device *, | |
67 | struct packet_type *, struct net_device *); | |
68 | static int fcoe_percpu_receive_thread(void *arg); | |
69 | static void fcoe_clean_pending_queue(struct fc_lport *lp); | |
70 | static void fcoe_percpu_clean(struct fc_lport *lp); | |
71 | static int fcoe_link_ok(struct fc_lport *lp); | |
72 | ||
73 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); | |
74 | static int fcoe_hostlist_add(const struct fc_lport *); | |
75 | static int fcoe_hostlist_remove(const struct fc_lport *); | |
76 | ||
4bb6b515 | 77 | static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *); |
85b4aa49 RL |
78 | static int fcoe_device_notification(struct notifier_block *, ulong, void *); |
79 | static void fcoe_dev_setup(void); | |
80 | static void fcoe_dev_cleanup(void); | |
81 | ||
82 | /* notification function from net device */ | |
83 | static struct notifier_block fcoe_notifier = { | |
84 | .notifier_call = fcoe_device_notification, | |
85 | }; | |
86 | ||
7f349142 VD |
87 | static struct scsi_transport_template *scsi_transport_fcoe_sw; |
88 | ||
89 | struct fc_function_template fcoe_transport_function = { | |
90 | .show_host_node_name = 1, | |
91 | .show_host_port_name = 1, | |
92 | .show_host_supported_classes = 1, | |
93 | .show_host_supported_fc4s = 1, | |
94 | .show_host_active_fc4s = 1, | |
95 | .show_host_maxframe_size = 1, | |
96 | ||
97 | .show_host_port_id = 1, | |
98 | .show_host_supported_speeds = 1, | |
99 | .get_host_speed = fc_get_host_speed, | |
100 | .show_host_speed = 1, | |
101 | .show_host_port_type = 1, | |
102 | .get_host_port_state = fc_get_host_port_state, | |
103 | .show_host_port_state = 1, | |
104 | .show_host_symbolic_name = 1, | |
105 | ||
106 | .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), | |
107 | .show_rport_maxframe_size = 1, | |
108 | .show_rport_supported_classes = 1, | |
109 | ||
110 | .show_host_fabric_name = 1, | |
111 | .show_starget_node_name = 1, | |
112 | .show_starget_port_name = 1, | |
113 | .show_starget_port_id = 1, | |
114 | .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, | |
115 | .show_rport_dev_loss_tmo = 1, | |
116 | .get_fc_host_stats = fc_get_host_stats, | |
117 | .issue_fc_host_lip = fcoe_reset, | |
118 | ||
119 | .terminate_rport_io = fc_rport_terminate_io, | |
120 | }; | |
121 | ||
122 | static struct scsi_host_template fcoe_shost_template = { | |
123 | .module = THIS_MODULE, | |
124 | .name = "FCoE Driver", | |
125 | .proc_name = FCOE_NAME, | |
126 | .queuecommand = fc_queuecommand, | |
127 | .eh_abort_handler = fc_eh_abort, | |
128 | .eh_device_reset_handler = fc_eh_device_reset, | |
129 | .eh_host_reset_handler = fc_eh_host_reset, | |
130 | .slave_alloc = fc_slave_alloc, | |
131 | .change_queue_depth = fc_change_queue_depth, | |
132 | .change_queue_type = fc_change_queue_type, | |
133 | .this_id = -1, | |
134 | .cmd_per_lun = 32, | |
135 | .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, | |
136 | .use_clustering = ENABLE_CLUSTERING, | |
137 | .sg_tablesize = SG_ALL, | |
138 | .max_sectors = 0xffff, | |
139 | }; | |
140 | ||
ab6b85c1 VD |
141 | /** |
142 | * fcoe_fip_recv - handle a received FIP frame. | |
143 | * @skb: the receive skb | |
144 | * @dev: associated &net_device | |
145 | * @ptype: the &packet_type structure which was used to register this handler. | |
146 | * @orig_dev: original receive &net_device, in case @dev is a bond. | |
147 | * | |
148 | * Returns: 0 for success | |
149 | */ | |
150 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, | |
151 | struct packet_type *ptype, | |
152 | struct net_device *orig_dev) | |
153 | { | |
154 | struct fcoe_softc *fc; | |
155 | ||
156 | fc = container_of(ptype, struct fcoe_softc, fip_packet_type); | |
157 | fcoe_ctlr_recv(&fc->ctlr, skb); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /** | |
162 | * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame. | |
163 | * @fip: FCoE controller. | |
164 | * @skb: FIP Packet. | |
165 | */ | |
166 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
167 | { | |
1d1b88dc | 168 | skb->dev = fcoe_from_ctlr(fip)->netdev; |
ab6b85c1 VD |
169 | dev_queue_xmit(skb); |
170 | } | |
171 | ||
172 | /** | |
173 | * fcoe_update_src_mac() - Update Ethernet MAC filters. | |
174 | * @fip: FCoE controller. | |
175 | * @old: Unicast MAC address to delete if the MAC is non-zero. | |
176 | * @new: Unicast MAC address to add. | |
177 | * | |
178 | * Remove any previously-set unicast MAC filter. | |
179 | * Add secondary FCoE MAC address filter for our OUI. | |
180 | */ | |
181 | static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new) | |
182 | { | |
183 | struct fcoe_softc *fc; | |
184 | ||
185 | fc = fcoe_from_ctlr(fip); | |
186 | rtnl_lock(); | |
187 | if (!is_zero_ether_addr(old)) | |
1d1b88dc VD |
188 | dev_unicast_delete(fc->netdev, old); |
189 | dev_unicast_add(fc->netdev, new); | |
ab6b85c1 VD |
190 | rtnl_unlock(); |
191 | } | |
192 | ||
7f349142 VD |
193 | /** |
194 | * fcoe_lport_config() - sets up the fc_lport | |
195 | * @lp: ptr to the fc_lport | |
7f349142 VD |
196 | * |
197 | * Returns: 0 for success | |
198 | */ | |
199 | static int fcoe_lport_config(struct fc_lport *lp) | |
200 | { | |
201 | lp->link_up = 0; | |
202 | lp->qfull = 0; | |
203 | lp->max_retry_count = 3; | |
a3666955 | 204 | lp->max_rport_retry_count = 3; |
7f349142 VD |
205 | lp->e_d_tov = 2 * 1000; /* FC-FS default */ |
206 | lp->r_a_tov = 2 * 2 * 1000; | |
207 | lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | | |
208 | FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); | |
209 | ||
210 | fc_lport_init_stats(lp); | |
211 | ||
212 | /* lport fc_lport related configuration */ | |
213 | fc_lport_config(lp); | |
214 | ||
215 | /* offload related configuration */ | |
216 | lp->crc_offload = 0; | |
217 | lp->seq_offload = 0; | |
218 | lp->lro_enabled = 0; | |
219 | lp->lro_xid = 0; | |
220 | lp->lso_max = 0; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
ab6b85c1 VD |
225 | /** |
226 | * fcoe_netdev_cleanup() - clean up netdev configurations | |
227 | * @fc: ptr to the fcoe_softc | |
228 | */ | |
229 | void fcoe_netdev_cleanup(struct fcoe_softc *fc) | |
230 | { | |
231 | u8 flogi_maddr[ETH_ALEN]; | |
232 | ||
233 | /* Don't listen for Ethernet packets anymore */ | |
234 | dev_remove_pack(&fc->fcoe_packet_type); | |
235 | dev_remove_pack(&fc->fip_packet_type); | |
236 | ||
237 | /* Delete secondary MAC addresses */ | |
238 | rtnl_lock(); | |
239 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
1d1b88dc | 240 | dev_unicast_delete(fc->netdev, flogi_maddr); |
ab6b85c1 | 241 | if (!is_zero_ether_addr(fc->ctlr.data_src_addr)) |
1d1b88dc | 242 | dev_unicast_delete(fc->netdev, fc->ctlr.data_src_addr); |
184dd345 | 243 | if (fc->ctlr.spma) |
1d1b88dc VD |
244 | dev_unicast_delete(fc->netdev, fc->ctlr.ctl_src_addr); |
245 | dev_mc_delete(fc->netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); | |
ab6b85c1 VD |
246 | rtnl_unlock(); |
247 | } | |
248 | ||
1047f221 VD |
249 | /** |
250 | * fcoe_queue_timer() - fcoe queue timer | |
251 | * @lp: the fc_lport pointer | |
252 | * | |
253 | * Calls fcoe_check_wait_queue on timeout | |
254 | * | |
255 | */ | |
256 | static void fcoe_queue_timer(ulong lp) | |
257 | { | |
258 | fcoe_check_wait_queue((struct fc_lport *)lp, NULL); | |
259 | } | |
260 | ||
7f349142 VD |
261 | /** |
262 | * fcoe_netdev_config() - Set up netdev for SW FCoE | |
263 | * @lp : ptr to the fc_lport | |
264 | * @netdev : ptr to the associated netdevice struct | |
265 | * | |
266 | * Must be called after fcoe_lport_config() as it will use lport mutex | |
267 | * | |
268 | * Returns : 0 for success | |
269 | */ | |
270 | static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) | |
271 | { | |
272 | u32 mfs; | |
273 | u64 wwnn, wwpn; | |
274 | struct fcoe_softc *fc; | |
275 | u8 flogi_maddr[ETH_ALEN]; | |
184dd345 | 276 | struct netdev_hw_addr *ha; |
7f349142 VD |
277 | |
278 | /* Setup lport private data to point to fcoe softc */ | |
279 | fc = lport_priv(lp); | |
97c8389d | 280 | fc->ctlr.lp = lp; |
1d1b88dc | 281 | fc->netdev = netdev; |
7f349142 VD |
282 | |
283 | /* Do not support for bonding device */ | |
1d1b88dc VD |
284 | if ((netdev->priv_flags & IFF_MASTER_ALB) || |
285 | (netdev->priv_flags & IFF_SLAVE_INACTIVE) || | |
286 | (netdev->priv_flags & IFF_MASTER_8023AD)) { | |
7f349142 VD |
287 | return -EOPNOTSUPP; |
288 | } | |
289 | ||
290 | /* | |
291 | * Determine max frame size based on underlying device and optional | |
292 | * user-configured limit. If the MFS is too low, fcoe_link_ok() | |
293 | * will return 0, so do this first. | |
294 | */ | |
1d1b88dc VD |
295 | mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + |
296 | sizeof(struct fcoe_crc_eof)); | |
7f349142 VD |
297 | if (fc_set_mfs(lp, mfs)) |
298 | return -EINVAL; | |
299 | ||
7f349142 | 300 | /* offload features support */ |
1d1b88dc | 301 | if (netdev->features & NETIF_F_SG) |
7f349142 VD |
302 | lp->sg_supp = 1; |
303 | ||
7f349142 VD |
304 | if (netdev->features & NETIF_F_FCOE_CRC) { |
305 | lp->crc_offload = 1; | |
d5488eb9 | 306 | FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); |
7f349142 | 307 | } |
7f349142 VD |
308 | if (netdev->features & NETIF_F_FSO) { |
309 | lp->seq_offload = 1; | |
310 | lp->lso_max = netdev->gso_max_size; | |
d5488eb9 RL |
311 | FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", |
312 | lp->lso_max); | |
7f349142 | 313 | } |
7f349142 VD |
314 | if (netdev->fcoe_ddp_xid) { |
315 | lp->lro_enabled = 1; | |
316 | lp->lro_xid = netdev->fcoe_ddp_xid; | |
d5488eb9 RL |
317 | FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", |
318 | lp->lro_xid); | |
7f349142 VD |
319 | } |
320 | skb_queue_head_init(&fc->fcoe_pending_queue); | |
321 | fc->fcoe_pending_queue_active = 0; | |
1047f221 | 322 | setup_timer(&fc->timer, fcoe_queue_timer, (unsigned long)lp); |
7f349142 | 323 | |
184dd345 VD |
324 | /* look for SAN MAC address, if multiple SAN MACs exist, only |
325 | * use the first one for SPMA */ | |
326 | rcu_read_lock(); | |
327 | for_each_dev_addr(netdev, ha) { | |
328 | if ((ha->type == NETDEV_HW_ADDR_T_SAN) && | |
7a7f0c7f | 329 | (is_valid_ether_addr(ha->addr))) { |
184dd345 VD |
330 | memcpy(fc->ctlr.ctl_src_addr, ha->addr, ETH_ALEN); |
331 | fc->ctlr.spma = 1; | |
332 | break; | |
333 | } | |
334 | } | |
335 | rcu_read_unlock(); | |
336 | ||
7f349142 | 337 | /* setup Source Mac Address */ |
184dd345 | 338 | if (!fc->ctlr.spma) |
1d1b88dc VD |
339 | memcpy(fc->ctlr.ctl_src_addr, netdev->dev_addr, |
340 | fc->netdev->addr_len); | |
7f349142 | 341 | |
1d1b88dc | 342 | wwnn = fcoe_wwn_from_mac(netdev->dev_addr, 1, 0); |
7f349142 VD |
343 | fc_set_wwnn(lp, wwnn); |
344 | /* XXX - 3rd arg needs to be vlan id */ | |
1d1b88dc | 345 | wwpn = fcoe_wwn_from_mac(netdev->dev_addr, 2, 0); |
7f349142 VD |
346 | fc_set_wwpn(lp, wwpn); |
347 | ||
348 | /* | |
349 | * Add FCoE MAC address as second unicast MAC address | |
350 | * or enter promiscuous mode if not capable of listening | |
351 | * for multiple unicast MACs. | |
352 | */ | |
353 | rtnl_lock(); | |
354 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); | |
1d1b88dc | 355 | dev_unicast_add(netdev, flogi_maddr); |
184dd345 | 356 | if (fc->ctlr.spma) |
1d1b88dc VD |
357 | dev_unicast_add(netdev, fc->ctlr.ctl_src_addr); |
358 | dev_mc_add(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); | |
7f349142 VD |
359 | rtnl_unlock(); |
360 | ||
361 | /* | |
362 | * setup the receive function from ethernet driver | |
363 | * on the ethertype for the given device | |
364 | */ | |
365 | fc->fcoe_packet_type.func = fcoe_rcv; | |
366 | fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); | |
1d1b88dc | 367 | fc->fcoe_packet_type.dev = netdev; |
7f349142 VD |
368 | dev_add_pack(&fc->fcoe_packet_type); |
369 | ||
ab6b85c1 VD |
370 | fc->fip_packet_type.func = fcoe_fip_recv; |
371 | fc->fip_packet_type.type = htons(ETH_P_FIP); | |
1d1b88dc | 372 | fc->fip_packet_type.dev = netdev; |
ab6b85c1 VD |
373 | dev_add_pack(&fc->fip_packet_type); |
374 | ||
7f349142 VD |
375 | return 0; |
376 | } | |
377 | ||
378 | /** | |
379 | * fcoe_shost_config() - Sets up fc_lport->host | |
380 | * @lp : ptr to the fc_lport | |
381 | * @shost : ptr to the associated scsi host | |
382 | * @dev : device associated to scsi host | |
383 | * | |
384 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() | |
385 | * | |
386 | * Returns : 0 for success | |
387 | */ | |
388 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, | |
389 | struct device *dev) | |
390 | { | |
391 | int rc = 0; | |
392 | ||
393 | /* lport scsi host config */ | |
394 | lp->host = shost; | |
395 | ||
396 | lp->host->max_lun = FCOE_MAX_LUN; | |
397 | lp->host->max_id = FCOE_MAX_FCP_TARGET; | |
398 | lp->host->max_channel = 0; | |
399 | lp->host->transportt = scsi_transport_fcoe_sw; | |
400 | ||
401 | /* add the new host to the SCSI-ml */ | |
402 | rc = scsi_add_host(lp->host, dev); | |
403 | if (rc) { | |
d5488eb9 RL |
404 | FCOE_NETDEV_DBG(fcoe_netdev(lp), "fcoe_shost_config: " |
405 | "error on scsi_add_host\n"); | |
7f349142 VD |
406 | return rc; |
407 | } | |
408 | sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", | |
409 | FCOE_NAME, FCOE_VERSION, | |
410 | fcoe_netdev(lp)->name); | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
d7179680 VD |
415 | /* |
416 | * fcoe_oem_match() - match for read types IO | |
417 | * @fp: the fc_frame for new IO. | |
418 | * | |
419 | * Returns : true for read types IO, otherwise returns false. | |
420 | */ | |
421 | bool fcoe_oem_match(struct fc_frame *fp) | |
422 | { | |
05cc7390 YZ |
423 | return fc_fcp_is_read(fr_fsp(fp)) && |
424 | (fr_fsp(fp)->data_len > fcoe_ddp_min); | |
d7179680 VD |
425 | } |
426 | ||
7f349142 VD |
427 | /** |
428 | * fcoe_em_config() - allocates em for this lport | |
429 | * @lp: the port that em is to allocated for | |
430 | * | |
e8af4d43 VD |
431 | * Called with write fcoe_hostlist_lock held. |
432 | * | |
7f349142 VD |
433 | * Returns : 0 on success |
434 | */ | |
435 | static inline int fcoe_em_config(struct fc_lport *lp) | |
436 | { | |
d7179680 VD |
437 | struct fcoe_softc *fc = lport_priv(lp); |
438 | struct fcoe_softc *oldfc = NULL; | |
1d1b88dc | 439 | struct net_device *old_real_dev, *cur_real_dev; |
d7179680 VD |
440 | u16 min_xid = FCOE_MIN_XID; |
441 | u16 max_xid = FCOE_MAX_XID; | |
442 | ||
443 | /* | |
444 | * Check if need to allocate an em instance for | |
445 | * offload exchange ids to be shared across all VN_PORTs/lport. | |
446 | */ | |
447 | if (!lp->lro_enabled || !lp->lro_xid || (lp->lro_xid >= max_xid)) { | |
448 | lp->lro_xid = 0; | |
449 | goto skip_oem; | |
450 | } | |
451 | ||
452 | /* | |
453 | * Reuse existing offload em instance in case | |
1d1b88dc | 454 | * it is already allocated on real eth device |
d7179680 | 455 | */ |
1d1b88dc VD |
456 | if (fc->netdev->priv_flags & IFF_802_1Q_VLAN) |
457 | cur_real_dev = vlan_dev_real_dev(fc->netdev); | |
458 | else | |
459 | cur_real_dev = fc->netdev; | |
460 | ||
d7179680 | 461 | list_for_each_entry(oldfc, &fcoe_hostlist, list) { |
1d1b88dc VD |
462 | if (oldfc->netdev->priv_flags & IFF_802_1Q_VLAN) |
463 | old_real_dev = vlan_dev_real_dev(oldfc->netdev); | |
464 | else | |
465 | old_real_dev = oldfc->netdev; | |
466 | ||
467 | if (cur_real_dev == old_real_dev) { | |
d7179680 VD |
468 | fc->oem = oldfc->oem; |
469 | break; | |
470 | } | |
471 | } | |
472 | ||
473 | if (fc->oem) { | |
474 | if (!fc_exch_mgr_add(lp, fc->oem, fcoe_oem_match)) { | |
475 | printk(KERN_ERR "fcoe_em_config: failed to add " | |
476 | "offload em:%p on interface:%s\n", | |
1d1b88dc | 477 | fc->oem, fc->netdev->name); |
d7179680 VD |
478 | return -ENOMEM; |
479 | } | |
480 | } else { | |
481 | fc->oem = fc_exch_mgr_alloc(lp, FC_CLASS_3, | |
482 | FCOE_MIN_XID, lp->lro_xid, | |
483 | fcoe_oem_match); | |
484 | if (!fc->oem) { | |
485 | printk(KERN_ERR "fcoe_em_config: failed to allocate " | |
486 | "em for offload exches on interface:%s\n", | |
1d1b88dc | 487 | fc->netdev->name); |
d7179680 VD |
488 | return -ENOMEM; |
489 | } | |
490 | } | |
491 | ||
492 | /* | |
493 | * Exclude offload EM xid range from next EM xid range. | |
494 | */ | |
495 | min_xid += lp->lro_xid + 1; | |
496 | ||
497 | skip_oem: | |
498 | if (!fc_exch_mgr_alloc(lp, FC_CLASS_3, min_xid, max_xid, NULL)) { | |
499 | printk(KERN_ERR "fcoe_em_config: failed to " | |
1d1b88dc | 500 | "allocate em on interface %s\n", fc->netdev->name); |
7f349142 | 501 | return -ENOMEM; |
d7179680 | 502 | } |
7f349142 VD |
503 | |
504 | return 0; | |
505 | } | |
506 | ||
507 | /** | |
508 | * fcoe_if_destroy() - FCoE software HBA tear-down function | |
509 | * @netdev: ptr to the associated net_device | |
510 | * | |
511 | * Returns: 0 if link is OK for use by FCoE. | |
512 | */ | |
513 | static int fcoe_if_destroy(struct net_device *netdev) | |
514 | { | |
515 | struct fc_lport *lp = NULL; | |
516 | struct fcoe_softc *fc; | |
7f349142 VD |
517 | |
518 | BUG_ON(!netdev); | |
519 | ||
d5488eb9 | 520 | FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); |
7f349142 VD |
521 | |
522 | lp = fcoe_hostlist_lookup(netdev); | |
523 | if (!lp) | |
524 | return -ENODEV; | |
525 | ||
526 | fc = lport_priv(lp); | |
527 | ||
528 | /* Logout of the fabric */ | |
529 | fc_fabric_logoff(lp); | |
530 | ||
531 | /* Remove the instance from fcoe's list */ | |
532 | fcoe_hostlist_remove(lp); | |
533 | ||
ab6b85c1 VD |
534 | /* clean up netdev configurations */ |
535 | fcoe_netdev_cleanup(fc); | |
536 | ||
537 | /* tear-down the FCoE controller */ | |
97c8389d | 538 | fcoe_ctlr_destroy(&fc->ctlr); |
7f349142 | 539 | |
f161fb72 JE |
540 | /* Free queued packets for the per-CPU receive threads */ |
541 | fcoe_percpu_clean(lp); | |
542 | ||
7f349142 VD |
543 | /* Cleanup the fc_lport */ |
544 | fc_lport_destroy(lp); | |
545 | fc_fcp_destroy(lp); | |
546 | ||
547 | /* Detach from the scsi-ml */ | |
548 | fc_remove_host(lp->host); | |
549 | scsi_remove_host(lp->host); | |
550 | ||
551 | /* There are no more rports or I/O, free the EM */ | |
52ff878c | 552 | fc_exch_mgr_free(lp); |
7f349142 | 553 | |
7f349142 VD |
554 | /* Free existing skbs */ |
555 | fcoe_clean_pending_queue(lp); | |
556 | ||
1047f221 VD |
557 | /* Stop the timer */ |
558 | del_timer_sync(&fc->timer); | |
559 | ||
7f349142 VD |
560 | /* Free memory used by statistical counters */ |
561 | fc_lport_free_stats(lp); | |
562 | ||
563 | /* Release the net_device and Scsi_Host */ | |
1d1b88dc | 564 | dev_put(netdev); |
7f349142 VD |
565 | scsi_host_put(lp->host); |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | /* | |
571 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device | |
572 | * @lp: the corresponding fc_lport | |
573 | * @xid: the exchange id for this ddp transfer | |
574 | * @sgl: the scatterlist describing this transfer | |
575 | * @sgc: number of sg items | |
576 | * | |
577 | * Returns : 0 no ddp | |
578 | */ | |
579 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, | |
580 | struct scatterlist *sgl, unsigned int sgc) | |
581 | { | |
582 | struct net_device *n = fcoe_netdev(lp); | |
583 | ||
584 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup) | |
585 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | /* | |
591 | * fcoe_ddp_done - calls LLD's ddp_done through net_device | |
592 | * @lp: the corresponding fc_lport | |
593 | * @xid: the exchange id for this ddp transfer | |
594 | * | |
595 | * Returns : the length of data that have been completed by ddp | |
596 | */ | |
597 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) | |
598 | { | |
599 | struct net_device *n = fcoe_netdev(lp); | |
600 | ||
601 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done) | |
602 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); | |
603 | return 0; | |
604 | } | |
605 | ||
606 | static struct libfc_function_template fcoe_libfc_fcn_templ = { | |
607 | .frame_send = fcoe_xmit, | |
608 | .ddp_setup = fcoe_ddp_setup, | |
609 | .ddp_done = fcoe_ddp_done, | |
610 | }; | |
611 | ||
612 | /** | |
613 | * fcoe_if_create() - this function creates the fcoe interface | |
614 | * @netdev: pointer the associated netdevice | |
615 | * | |
616 | * Creates fc_lport struct and scsi_host for lport, configures lport | |
617 | * and starts fabric login. | |
618 | * | |
619 | * Returns : 0 on success | |
620 | */ | |
621 | static int fcoe_if_create(struct net_device *netdev) | |
622 | { | |
623 | int rc; | |
624 | struct fc_lport *lp = NULL; | |
625 | struct fcoe_softc *fc; | |
626 | struct Scsi_Host *shost; | |
627 | ||
628 | BUG_ON(!netdev); | |
629 | ||
d5488eb9 | 630 | FCOE_NETDEV_DBG(netdev, "Create Interface\n"); |
7f349142 VD |
631 | |
632 | lp = fcoe_hostlist_lookup(netdev); | |
633 | if (lp) | |
634 | return -EEXIST; | |
635 | ||
a0a25da2 VD |
636 | shost = libfc_host_alloc(&fcoe_shost_template, |
637 | sizeof(struct fcoe_softc)); | |
7f349142 | 638 | if (!shost) { |
d5488eb9 | 639 | FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); |
7f349142 VD |
640 | return -ENOMEM; |
641 | } | |
642 | lp = shost_priv(shost); | |
643 | fc = lport_priv(lp); | |
644 | ||
645 | /* configure fc_lport, e.g., em */ | |
646 | rc = fcoe_lport_config(lp); | |
647 | if (rc) { | |
d5488eb9 RL |
648 | FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " |
649 | "interface\n"); | |
7f349142 VD |
650 | goto out_host_put; |
651 | } | |
652 | ||
97c8389d JE |
653 | /* |
654 | * Initialize FIP. | |
655 | */ | |
656 | fcoe_ctlr_init(&fc->ctlr); | |
657 | fc->ctlr.send = fcoe_fip_send; | |
658 | fc->ctlr.update_mac = fcoe_update_src_mac; | |
659 | ||
ab6b85c1 VD |
660 | /* configure lport network properties */ |
661 | rc = fcoe_netdev_config(lp, netdev); | |
662 | if (rc) { | |
d5488eb9 RL |
663 | FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " |
664 | "interface\n"); | |
ab6b85c1 VD |
665 | goto out_netdev_cleanup; |
666 | } | |
97c8389d | 667 | |
7f349142 VD |
668 | /* configure lport scsi host properties */ |
669 | rc = fcoe_shost_config(lp, shost, &netdev->dev); | |
670 | if (rc) { | |
d5488eb9 RL |
671 | FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " |
672 | "interface\n"); | |
ab6b85c1 | 673 | goto out_netdev_cleanup; |
7f349142 VD |
674 | } |
675 | ||
96316099 VD |
676 | /* Initialize the library */ |
677 | rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ); | |
7f349142 | 678 | if (rc) { |
96316099 | 679 | FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " |
d5488eb9 | 680 | "interface\n"); |
96316099 | 681 | goto out_lp_destroy; |
7f349142 VD |
682 | } |
683 | ||
e8af4d43 VD |
684 | /* |
685 | * fcoe_em_alloc() and fcoe_hostlist_add() both | |
686 | * need to be atomic under fcoe_hostlist_lock | |
687 | * since fcoe_em_alloc() looks for an existing EM | |
688 | * instance on host list updated by fcoe_hostlist_add(). | |
689 | */ | |
690 | write_lock(&fcoe_hostlist_lock); | |
96316099 VD |
691 | /* lport exch manager allocation */ |
692 | rc = fcoe_em_config(lp); | |
7f349142 | 693 | if (rc) { |
96316099 | 694 | FCOE_NETDEV_DBG(netdev, "Could not configure the EM for the " |
d5488eb9 | 695 | "interface\n"); |
7f349142 VD |
696 | goto out_lp_destroy; |
697 | } | |
698 | ||
699 | /* add to lports list */ | |
700 | fcoe_hostlist_add(lp); | |
e8af4d43 | 701 | write_unlock(&fcoe_hostlist_lock); |
7f349142 VD |
702 | |
703 | lp->boot_time = jiffies; | |
704 | ||
705 | fc_fabric_login(lp); | |
706 | ||
97c8389d JE |
707 | if (!fcoe_link_ok(lp)) |
708 | fcoe_ctlr_link_up(&fc->ctlr); | |
709 | ||
7f349142 VD |
710 | dev_hold(netdev); |
711 | ||
712 | return rc; | |
713 | ||
714 | out_lp_destroy: | |
52ff878c | 715 | fc_exch_mgr_free(lp); |
ab6b85c1 VD |
716 | out_netdev_cleanup: |
717 | fcoe_netdev_cleanup(fc); | |
7f349142 VD |
718 | out_host_put: |
719 | scsi_host_put(lp->host); | |
720 | return rc; | |
721 | } | |
722 | ||
723 | /** | |
724 | * fcoe_if_init() - attach to scsi transport | |
725 | * | |
726 | * Returns : 0 on success | |
727 | */ | |
728 | static int __init fcoe_if_init(void) | |
729 | { | |
730 | /* attach to scsi transport */ | |
731 | scsi_transport_fcoe_sw = | |
732 | fc_attach_transport(&fcoe_transport_function); | |
733 | ||
734 | if (!scsi_transport_fcoe_sw) { | |
d5488eb9 | 735 | printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); |
7f349142 VD |
736 | return -ENODEV; |
737 | } | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
742 | /** | |
743 | * fcoe_if_exit() - detach from scsi transport | |
744 | * | |
745 | * Returns : 0 on success | |
746 | */ | |
747 | int __exit fcoe_if_exit(void) | |
748 | { | |
749 | fc_release_transport(scsi_transport_fcoe_sw); | |
750 | return 0; | |
751 | } | |
752 | ||
8976f424 RL |
753 | /** |
754 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu | |
755 | * @cpu: cpu index for the online cpu | |
756 | */ | |
757 | static void fcoe_percpu_thread_create(unsigned int cpu) | |
758 | { | |
759 | struct fcoe_percpu_s *p; | |
760 | struct task_struct *thread; | |
761 | ||
762 | p = &per_cpu(fcoe_percpu, cpu); | |
763 | ||
764 | thread = kthread_create(fcoe_percpu_receive_thread, | |
765 | (void *)p, "fcoethread/%d", cpu); | |
766 | ||
767 | if (likely(!IS_ERR(p->thread))) { | |
768 | kthread_bind(thread, cpu); | |
769 | wake_up_process(thread); | |
770 | ||
771 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
772 | p->thread = thread; | |
773 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
774 | } | |
775 | } | |
776 | ||
777 | /** | |
778 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu | |
779 | * @cpu: cpu index the rx thread is to be removed | |
780 | * | |
781 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the | |
782 | * current CPU's Rx thread. If the thread being destroyed is bound to | |
783 | * the CPU processing this context the skbs will be freed. | |
784 | */ | |
785 | static void fcoe_percpu_thread_destroy(unsigned int cpu) | |
786 | { | |
787 | struct fcoe_percpu_s *p; | |
788 | struct task_struct *thread; | |
789 | struct page *crc_eof; | |
790 | struct sk_buff *skb; | |
791 | #ifdef CONFIG_SMP | |
792 | struct fcoe_percpu_s *p0; | |
793 | unsigned targ_cpu = smp_processor_id(); | |
794 | #endif /* CONFIG_SMP */ | |
795 | ||
d5488eb9 | 796 | FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); |
8976f424 RL |
797 | |
798 | /* Prevent any new skbs from being queued for this CPU. */ | |
799 | p = &per_cpu(fcoe_percpu, cpu); | |
800 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
801 | thread = p->thread; | |
802 | p->thread = NULL; | |
803 | crc_eof = p->crc_eof_page; | |
804 | p->crc_eof_page = NULL; | |
805 | p->crc_eof_offset = 0; | |
806 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
807 | ||
808 | #ifdef CONFIG_SMP | |
809 | /* | |
810 | * Don't bother moving the skb's if this context is running | |
811 | * on the same CPU that is having its thread destroyed. This | |
812 | * can easily happen when the module is removed. | |
813 | */ | |
814 | if (cpu != targ_cpu) { | |
815 | p0 = &per_cpu(fcoe_percpu, targ_cpu); | |
816 | spin_lock_bh(&p0->fcoe_rx_list.lock); | |
817 | if (p0->thread) { | |
d5488eb9 RL |
818 | FCOE_DBG("Moving frames from CPU %d to CPU %d\n", |
819 | cpu, targ_cpu); | |
8976f424 RL |
820 | |
821 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
822 | __skb_queue_tail(&p0->fcoe_rx_list, skb); | |
823 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
824 | } else { | |
825 | /* | |
826 | * The targeted CPU is not initialized and cannot accept | |
827 | * new skbs. Unlock the targeted CPU and drop the skbs | |
828 | * on the CPU that is going offline. | |
829 | */ | |
830 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
831 | kfree_skb(skb); | |
832 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
833 | } | |
834 | } else { | |
835 | /* | |
836 | * This scenario occurs when the module is being removed | |
837 | * and all threads are being destroyed. skbs will continue | |
838 | * to be shifted from the CPU thread that is being removed | |
839 | * to the CPU thread associated with the CPU that is processing | |
840 | * the module removal. Once there is only one CPU Rx thread it | |
841 | * will reach this case and we will drop all skbs and later | |
842 | * stop the thread. | |
843 | */ | |
844 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
845 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
846 | kfree_skb(skb); | |
847 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
848 | } | |
849 | #else | |
850 | /* | |
dd3fd72e | 851 | * This a non-SMP scenario where the singular Rx thread is |
8976f424 RL |
852 | * being removed. Free all skbs and stop the thread. |
853 | */ | |
854 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
855 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
856 | kfree_skb(skb); | |
857 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
858 | #endif | |
859 | ||
860 | if (thread) | |
861 | kthread_stop(thread); | |
862 | ||
863 | if (crc_eof) | |
864 | put_page(crc_eof); | |
865 | } | |
866 | ||
867 | /** | |
868 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback | |
869 | * @nfb: callback data block | |
870 | * @action: event triggering the callback | |
871 | * @hcpu: index for the cpu of this event | |
872 | * | |
873 | * This creates or destroys per cpu data for fcoe | |
874 | * | |
875 | * Returns NOTIFY_OK always. | |
876 | */ | |
877 | static int fcoe_cpu_callback(struct notifier_block *nfb, | |
878 | unsigned long action, void *hcpu) | |
879 | { | |
880 | unsigned cpu = (unsigned long)hcpu; | |
881 | ||
882 | switch (action) { | |
883 | case CPU_ONLINE: | |
884 | case CPU_ONLINE_FROZEN: | |
d5488eb9 | 885 | FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); |
8976f424 RL |
886 | fcoe_percpu_thread_create(cpu); |
887 | break; | |
888 | case CPU_DEAD: | |
889 | case CPU_DEAD_FROZEN: | |
d5488eb9 | 890 | FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); |
8976f424 RL |
891 | fcoe_percpu_thread_destroy(cpu); |
892 | break; | |
893 | default: | |
894 | break; | |
895 | } | |
896 | return NOTIFY_OK; | |
897 | } | |
898 | ||
899 | static struct notifier_block fcoe_cpu_notifier = { | |
900 | .notifier_call = fcoe_cpu_callback, | |
901 | }; | |
902 | ||
85b4aa49 | 903 | /** |
34f42a07 | 904 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
905 | * @skb: the receive skb |
906 | * @dev: associated net device | |
907 | * @ptype: context | |
dd3fd72e | 908 | * @olddev: last device |
85b4aa49 RL |
909 | * |
910 | * this function will receive the packet and build fc frame and pass it up | |
911 | * | |
912 | * Returns: 0 for success | |
34f42a07 | 913 | */ |
85b4aa49 RL |
914 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
915 | struct packet_type *ptype, struct net_device *olddev) | |
916 | { | |
917 | struct fc_lport *lp; | |
918 | struct fcoe_rcv_info *fr; | |
919 | struct fcoe_softc *fc; | |
85b4aa49 | 920 | struct fc_frame_header *fh; |
85b4aa49 | 921 | struct fcoe_percpu_s *fps; |
b2f0091f | 922 | unsigned int cpu; |
85b4aa49 RL |
923 | |
924 | fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); | |
97c8389d | 925 | lp = fc->ctlr.lp; |
85b4aa49 | 926 | if (unlikely(lp == NULL)) { |
d5488eb9 | 927 | FCOE_NETDEV_DBG(dev, "Cannot find hba structure"); |
85b4aa49 RL |
928 | goto err2; |
929 | } | |
97c8389d JE |
930 | if (!lp->link_up) |
931 | goto err2; | |
85b4aa49 | 932 | |
d5488eb9 RL |
933 | FCOE_NETDEV_DBG(dev, "skb_info: len:%d data_len:%d head:%p " |
934 | "data:%p tail:%p end:%p sum:%d dev:%s", | |
935 | skb->len, skb->data_len, skb->head, skb->data, | |
936 | skb_tail_pointer(skb), skb_end_pointer(skb), | |
937 | skb->csum, skb->dev ? skb->dev->name : "<NULL>"); | |
85b4aa49 RL |
938 | |
939 | /* check for FCOE packet type */ | |
940 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
d5488eb9 | 941 | FCOE_NETDEV_DBG(dev, "Wrong FC type frame"); |
85b4aa49 RL |
942 | goto err; |
943 | } | |
944 | ||
945 | /* | |
946 | * Check for minimum frame length, and make sure required FCoE | |
947 | * and FC headers are pulled into the linear data area. | |
948 | */ | |
949 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
950 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
951 | goto err; | |
952 | ||
953 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
954 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
955 | ||
85b4aa49 RL |
956 | fr = fcoe_dev_from_skb(skb); |
957 | fr->fr_dev = lp; | |
958 | fr->ptype = ptype; | |
5e5e92df | 959 | |
85b4aa49 | 960 | /* |
b2f0091f VD |
961 | * In case the incoming frame's exchange is originated from |
962 | * the initiator, then received frame's exchange id is ANDed | |
963 | * with fc_cpu_mask bits to get the same cpu on which exchange | |
964 | * was originated, otherwise just use the current cpu. | |
85b4aa49 | 965 | */ |
b2f0091f VD |
966 | if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) |
967 | cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; | |
968 | else | |
969 | cpu = smp_processor_id(); | |
5e5e92df | 970 | |
8976f424 | 971 | fps = &per_cpu(fcoe_percpu, cpu); |
85b4aa49 | 972 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
8976f424 RL |
973 | if (unlikely(!fps->thread)) { |
974 | /* | |
975 | * The targeted CPU is not ready, let's target | |
976 | * the first CPU now. For non-SMP systems this | |
977 | * will check the same CPU twice. | |
978 | */ | |
d5488eb9 RL |
979 | FCOE_NETDEV_DBG(dev, "CPU is online, but no receive thread " |
980 | "ready for incoming skb- using first online " | |
981 | "CPU.\n"); | |
8976f424 RL |
982 | |
983 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
984 | cpu = first_cpu(cpu_online_map); | |
985 | fps = &per_cpu(fcoe_percpu, cpu); | |
986 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
987 | if (!fps->thread) { | |
988 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
989 | goto err; | |
990 | } | |
991 | } | |
992 | ||
993 | /* | |
994 | * We now have a valid CPU that we're targeting for | |
995 | * this skb. We also have this receive thread locked, | |
996 | * so we're free to queue skbs into it's queue. | |
997 | */ | |
85b4aa49 RL |
998 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
999 | if (fps->fcoe_rx_list.qlen == 1) | |
1000 | wake_up_process(fps->thread); | |
1001 | ||
1002 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
1003 | ||
1004 | return 0; | |
1005 | err: | |
582b45bc | 1006 | fc_lport_get_stats(lp)->ErrorFrames++; |
85b4aa49 RL |
1007 | |
1008 | err2: | |
1009 | kfree_skb(skb); | |
1010 | return -1; | |
1011 | } | |
85b4aa49 RL |
1012 | |
1013 | /** | |
34f42a07 | 1014 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
1015 | * @skb: the skb to be xmitted |
1016 | * | |
1017 | * Returns: 0 for success | |
34f42a07 | 1018 | */ |
85b4aa49 RL |
1019 | static inline int fcoe_start_io(struct sk_buff *skb) |
1020 | { | |
1021 | int rc; | |
1022 | ||
1023 | skb_get(skb); | |
1024 | rc = dev_queue_xmit(skb); | |
1025 | if (rc != 0) | |
1026 | return rc; | |
1027 | kfree_skb(skb); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | /** | |
dd3fd72e | 1032 | * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof |
85b4aa49 RL |
1033 | * @skb: the skb to be xmitted |
1034 | * @tlen: total len | |
1035 | * | |
1036 | * Returns: 0 for success | |
34f42a07 | 1037 | */ |
85b4aa49 RL |
1038 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
1039 | { | |
1040 | struct fcoe_percpu_s *fps; | |
1041 | struct page *page; | |
85b4aa49 | 1042 | |
5e5e92df | 1043 | fps = &get_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1044 | page = fps->crc_eof_page; |
1045 | if (!page) { | |
1046 | page = alloc_page(GFP_ATOMIC); | |
1047 | if (!page) { | |
5e5e92df | 1048 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1049 | return -ENOMEM; |
1050 | } | |
1051 | fps->crc_eof_page = page; | |
8976f424 | 1052 | fps->crc_eof_offset = 0; |
85b4aa49 RL |
1053 | } |
1054 | ||
1055 | get_page(page); | |
1056 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
1057 | fps->crc_eof_offset, tlen); | |
1058 | skb->len += tlen; | |
1059 | skb->data_len += tlen; | |
1060 | skb->truesize += tlen; | |
1061 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
1062 | ||
1063 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
1064 | fps->crc_eof_page = NULL; | |
1065 | fps->crc_eof_offset = 0; | |
1066 | put_page(page); | |
1067 | } | |
5e5e92df | 1068 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1069 | return 0; |
1070 | } | |
1071 | ||
1072 | /** | |
34f42a07 | 1073 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
dd3fd72e | 1074 | * @fp: the fc_frame containing data to be checksummed |
85b4aa49 RL |
1075 | * |
1076 | * This uses crc32() to calculate the crc for fc frame | |
1077 | * Return : 32 bit crc | |
34f42a07 | 1078 | */ |
85b4aa49 RL |
1079 | u32 fcoe_fc_crc(struct fc_frame *fp) |
1080 | { | |
1081 | struct sk_buff *skb = fp_skb(fp); | |
1082 | struct skb_frag_struct *frag; | |
1083 | unsigned char *data; | |
1084 | unsigned long off, len, clen; | |
1085 | u32 crc; | |
1086 | unsigned i; | |
1087 | ||
1088 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
1089 | ||
1090 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1091 | frag = &skb_shinfo(skb)->frags[i]; | |
1092 | off = frag->page_offset; | |
1093 | len = frag->size; | |
1094 | while (len > 0) { | |
1095 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
1096 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
1097 | KM_SKB_DATA_SOFTIRQ); | |
1098 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
1099 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
1100 | off += clen; | |
1101 | len -= clen; | |
1102 | } | |
1103 | } | |
1104 | return crc; | |
1105 | } | |
85b4aa49 RL |
1106 | |
1107 | /** | |
34f42a07 | 1108 | * fcoe_xmit() - FCoE frame transmit function |
85b4aa49 RL |
1109 | * @lp: the associated local port |
1110 | * @fp: the fc_frame to be transmitted | |
1111 | * | |
1112 | * Return : 0 for success | |
34f42a07 | 1113 | */ |
85b4aa49 RL |
1114 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
1115 | { | |
4bb6b515 | 1116 | int wlen; |
85b4aa49 RL |
1117 | u32 crc; |
1118 | struct ethhdr *eh; | |
1119 | struct fcoe_crc_eof *cp; | |
1120 | struct sk_buff *skb; | |
1121 | struct fcoe_dev_stats *stats; | |
1122 | struct fc_frame_header *fh; | |
1123 | unsigned int hlen; /* header length implies the version */ | |
1124 | unsigned int tlen; /* trailer length */ | |
1125 | unsigned int elen; /* eth header, may include vlan */ | |
85b4aa49 RL |
1126 | struct fcoe_softc *fc; |
1127 | u8 sof, eof; | |
1128 | struct fcoe_hdr *hp; | |
1129 | ||
1130 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
1131 | ||
fc47ff6b | 1132 | fc = lport_priv(lp); |
85b4aa49 | 1133 | fh = fc_frame_header_get(fp); |
97c8389d JE |
1134 | skb = fp_skb(fp); |
1135 | wlen = skb->len / FCOE_WORD_TO_BYTE; | |
1136 | ||
1137 | if (!lp->link_up) { | |
3caf02ee | 1138 | kfree_skb(skb); |
97c8389d | 1139 | return 0; |
85b4aa49 RL |
1140 | } |
1141 | ||
97c8389d JE |
1142 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) && |
1143 | fcoe_ctlr_els_send(&fc->ctlr, skb)) | |
1144 | return 0; | |
1145 | ||
85b4aa49 RL |
1146 | sof = fr_sof(fp); |
1147 | eof = fr_eof(fp); | |
1148 | ||
4e57e1cb | 1149 | elen = sizeof(struct ethhdr); |
85b4aa49 RL |
1150 | hlen = sizeof(struct fcoe_hdr); |
1151 | tlen = sizeof(struct fcoe_crc_eof); | |
1152 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
1153 | ||
1154 | /* crc offload */ | |
1155 | if (likely(lp->crc_offload)) { | |
39ca9a06 | 1156 | skb->ip_summed = CHECKSUM_PARTIAL; |
85b4aa49 RL |
1157 | skb->csum_start = skb_headroom(skb); |
1158 | skb->csum_offset = skb->len; | |
1159 | crc = 0; | |
1160 | } else { | |
1161 | skb->ip_summed = CHECKSUM_NONE; | |
1162 | crc = fcoe_fc_crc(fp); | |
1163 | } | |
1164 | ||
1165 | /* copy fc crc and eof to the skb buff */ | |
1166 | if (skb_is_nonlinear(skb)) { | |
1167 | skb_frag_t *frag; | |
1168 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 1169 | kfree_skb(skb); |
85b4aa49 RL |
1170 | return -ENOMEM; |
1171 | } | |
1172 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
1173 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
1174 | + frag->page_offset; | |
1175 | } else { | |
1176 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
1177 | } | |
1178 | ||
1179 | memset(cp, 0, sizeof(*cp)); | |
1180 | cp->fcoe_eof = eof; | |
1181 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
1182 | ||
1183 | if (skb_is_nonlinear(skb)) { | |
1184 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
1185 | cp = NULL; | |
1186 | } | |
1187 | ||
dd3fd72e | 1188 | /* adjust skb network/transport offsets to match mac/fcoe/fc */ |
85b4aa49 RL |
1189 | skb_push(skb, elen + hlen); |
1190 | skb_reset_mac_header(skb); | |
1191 | skb_reset_network_header(skb); | |
1192 | skb->mac_len = elen; | |
211c738d | 1193 | skb->protocol = htons(ETH_P_FCOE); |
1d1b88dc | 1194 | skb->dev = fc->netdev; |
85b4aa49 RL |
1195 | |
1196 | /* fill up mac and fcoe headers */ | |
1197 | eh = eth_hdr(skb); | |
1198 | eh->h_proto = htons(ETH_P_FCOE); | |
97c8389d | 1199 | if (fc->ctlr.map_dest) |
85b4aa49 RL |
1200 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); |
1201 | else | |
1202 | /* insert GW address */ | |
97c8389d | 1203 | memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN); |
85b4aa49 | 1204 | |
97c8389d JE |
1205 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
1206 | memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN); | |
85b4aa49 | 1207 | else |
97c8389d | 1208 | memcpy(eh->h_source, fc->ctlr.data_src_addr, ETH_ALEN); |
85b4aa49 RL |
1209 | |
1210 | hp = (struct fcoe_hdr *)(eh + 1); | |
1211 | memset(hp, 0, sizeof(*hp)); | |
1212 | if (FC_FCOE_VER) | |
1213 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
1214 | hp->fcoe_sof = sof; | |
1215 | ||
39ca9a06 YZ |
1216 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ |
1217 | if (lp->seq_offload && fr_max_payload(fp)) { | |
1218 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; | |
1219 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); | |
1220 | } else { | |
1221 | skb_shinfo(skb)->gso_type = 0; | |
1222 | skb_shinfo(skb)->gso_size = 0; | |
1223 | } | |
85b4aa49 | 1224 | /* update tx stats: regardless if LLD fails */ |
582b45bc RL |
1225 | stats = fc_lport_get_stats(lp); |
1226 | stats->TxFrames++; | |
1227 | stats->TxWords += wlen; | |
85b4aa49 RL |
1228 | |
1229 | /* send down to lld */ | |
1230 | fr_dev(fp) = lp; | |
1231 | if (fc->fcoe_pending_queue.qlen) | |
4bb6b515 VD |
1232 | fcoe_check_wait_queue(lp, skb); |
1233 | else if (fcoe_start_io(skb)) | |
1234 | fcoe_check_wait_queue(lp, skb); | |
85b4aa49 RL |
1235 | |
1236 | return 0; | |
1237 | } | |
85b4aa49 | 1238 | |
34f42a07 RL |
1239 | /** |
1240 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
1241 | * @arg: ptr to the fcoe per cpu struct |
1242 | * | |
1243 | * Return: 0 for success | |
85b4aa49 RL |
1244 | */ |
1245 | int fcoe_percpu_receive_thread(void *arg) | |
1246 | { | |
1247 | struct fcoe_percpu_s *p = arg; | |
1248 | u32 fr_len; | |
1249 | struct fc_lport *lp; | |
1250 | struct fcoe_rcv_info *fr; | |
1251 | struct fcoe_dev_stats *stats; | |
1252 | struct fc_frame_header *fh; | |
1253 | struct sk_buff *skb; | |
1254 | struct fcoe_crc_eof crc_eof; | |
1255 | struct fc_frame *fp; | |
1256 | u8 *mac = NULL; | |
1257 | struct fcoe_softc *fc; | |
1258 | struct fcoe_hdr *hp; | |
1259 | ||
4469c195 | 1260 | set_user_nice(current, -20); |
85b4aa49 RL |
1261 | |
1262 | while (!kthread_should_stop()) { | |
1263 | ||
1264 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1265 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
1266 | set_current_state(TASK_INTERRUPTIBLE); | |
1267 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1268 | schedule(); | |
1269 | set_current_state(TASK_RUNNING); | |
1270 | if (kthread_should_stop()) | |
1271 | return 0; | |
1272 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1273 | } | |
1274 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1275 | fr = fcoe_dev_from_skb(skb); | |
1276 | lp = fr->fr_dev; | |
1277 | if (unlikely(lp == NULL)) { | |
d5488eb9 | 1278 | FCOE_NETDEV_DBG(skb->dev, "Invalid HBA Structure"); |
85b4aa49 RL |
1279 | kfree_skb(skb); |
1280 | continue; | |
1281 | } | |
1282 | ||
d5488eb9 RL |
1283 | FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d " |
1284 | "head:%p data:%p tail:%p end:%p sum:%d dev:%s", | |
1285 | skb->len, skb->data_len, | |
1286 | skb->head, skb->data, skb_tail_pointer(skb), | |
1287 | skb_end_pointer(skb), skb->csum, | |
1288 | skb->dev ? skb->dev->name : "<NULL>"); | |
85b4aa49 RL |
1289 | |
1290 | /* | |
1291 | * Save source MAC address before discarding header. | |
1292 | */ | |
1293 | fc = lport_priv(lp); | |
85b4aa49 RL |
1294 | if (skb_is_nonlinear(skb)) |
1295 | skb_linearize(skb); /* not ideal */ | |
97c8389d | 1296 | mac = eth_hdr(skb)->h_source; |
85b4aa49 RL |
1297 | |
1298 | /* | |
1299 | * Frame length checks and setting up the header pointers | |
1300 | * was done in fcoe_rcv already. | |
1301 | */ | |
1302 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
1303 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1304 | ||
582b45bc | 1305 | stats = fc_lport_get_stats(lp); |
85b4aa49 | 1306 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
582b45bc | 1307 | if (stats->ErrorFrames < 5) |
d5488eb9 | 1308 | printk(KERN_WARNING "fcoe: FCoE version " |
582b45bc RL |
1309 | "mismatch: The frame has " |
1310 | "version %x, but the " | |
1311 | "initiator supports version " | |
1312 | "%x\n", FC_FCOE_DECAPS_VER(hp), | |
1313 | FC_FCOE_VER); | |
1314 | stats->ErrorFrames++; | |
85b4aa49 RL |
1315 | kfree_skb(skb); |
1316 | continue; | |
1317 | } | |
1318 | ||
1319 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
1320 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
1321 | ||
582b45bc RL |
1322 | stats->RxFrames++; |
1323 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
85b4aa49 RL |
1324 | |
1325 | fp = (struct fc_frame *)skb; | |
1326 | fc_frame_init(fp); | |
1327 | fr_dev(fp) = lp; | |
1328 | fr_sof(fp) = hp->fcoe_sof; | |
1329 | ||
1330 | /* Copy out the CRC and EOF trailer for access */ | |
1331 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
1332 | kfree_skb(skb); | |
1333 | continue; | |
1334 | } | |
1335 | fr_eof(fp) = crc_eof.fcoe_eof; | |
1336 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
1337 | if (pskb_trim(skb, fr_len)) { | |
1338 | kfree_skb(skb); | |
1339 | continue; | |
1340 | } | |
1341 | ||
1342 | /* | |
1343 | * We only check CRC if no offload is available and if it is | |
1344 | * it's solicited data, in which case, the FCP layer would | |
1345 | * check it during the copy. | |
1346 | */ | |
07c00ec4 | 1347 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
85b4aa49 RL |
1348 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
1349 | else | |
1350 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
1351 | ||
1352 | fh = fc_frame_header_get(fp); | |
1353 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
1354 | fh->fh_type == FC_TYPE_FCP) { | |
52ff878c | 1355 | fc_exch_recv(lp, fp); |
85b4aa49 RL |
1356 | continue; |
1357 | } | |
1358 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
1359 | if (le32_to_cpu(fr_crc(fp)) != | |
1360 | ~crc32(~0, skb->data, fr_len)) { | |
d5488eb9 | 1361 | if (stats->InvalidCRCCount < 5) |
85b4aa49 RL |
1362 | printk(KERN_WARNING "fcoe: dropping " |
1363 | "frame with CRC error\n"); | |
1364 | stats->InvalidCRCCount++; | |
1365 | stats->ErrorFrames++; | |
1366 | fc_frame_free(fp); | |
1367 | continue; | |
1368 | } | |
1369 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
1370 | } | |
97c8389d JE |
1371 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) && |
1372 | fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) { | |
1373 | fc_frame_free(fp); | |
1374 | continue; | |
1375 | } | |
52ff878c | 1376 | fc_exch_recv(lp, fp); |
85b4aa49 RL |
1377 | } |
1378 | return 0; | |
1379 | } | |
1380 | ||
85b4aa49 | 1381 | /** |
dd3fd72e CL |
1382 | * fcoe_check_wait_queue() - attempt to clear the transmit backlog |
1383 | * @lp: the fc_lport | |
85b4aa49 RL |
1384 | * |
1385 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
1386 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 | 1387 | * transmitted, return qlen or -1 if a error occurs, then restore |
dd3fd72e | 1388 | * wait_queue and try again later. |
85b4aa49 RL |
1389 | * |
1390 | * The wait_queue is used when the skb transmit fails. skb will go | |
dd3fd72e | 1391 | * in the wait_queue which will be emptied by the timer function or |
85b4aa49 | 1392 | * by the next skb transmit. |
34f42a07 | 1393 | */ |
4bb6b515 | 1394 | static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb) |
85b4aa49 | 1395 | { |
55c8bafb | 1396 | struct fcoe_softc *fc = lport_priv(lp); |
4bb6b515 | 1397 | int rc; |
85b4aa49 | 1398 | |
85b4aa49 | 1399 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
4bb6b515 VD |
1400 | |
1401 | if (skb) | |
1402 | __skb_queue_tail(&fc->fcoe_pending_queue, skb); | |
1403 | ||
c826a314 VD |
1404 | if (fc->fcoe_pending_queue_active) |
1405 | goto out; | |
1406 | fc->fcoe_pending_queue_active = 1; | |
55c8bafb CL |
1407 | |
1408 | while (fc->fcoe_pending_queue.qlen) { | |
1409 | /* keep qlen > 0 until fcoe_start_io succeeds */ | |
1410 | fc->fcoe_pending_queue.qlen++; | |
1411 | skb = __skb_dequeue(&fc->fcoe_pending_queue); | |
1412 | ||
1413 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1414 | rc = fcoe_start_io(skb); | |
1415 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1416 | ||
1417 | if (rc) { | |
1418 | __skb_queue_head(&fc->fcoe_pending_queue, skb); | |
1419 | /* undo temporary increment above */ | |
1420 | fc->fcoe_pending_queue.qlen--; | |
1421 | break; | |
85b4aa49 | 1422 | } |
55c8bafb CL |
1423 | /* undo temporary increment above */ |
1424 | fc->fcoe_pending_queue.qlen--; | |
85b4aa49 | 1425 | } |
55c8bafb CL |
1426 | |
1427 | if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) | |
1428 | lp->qfull = 0; | |
1047f221 VD |
1429 | if (fc->fcoe_pending_queue.qlen && !timer_pending(&fc->timer)) |
1430 | mod_timer(&fc->timer, jiffies + 2); | |
c826a314 | 1431 | fc->fcoe_pending_queue_active = 0; |
c826a314 | 1432 | out: |
4bb6b515 VD |
1433 | if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
1434 | lp->qfull = 1; | |
85b4aa49 | 1435 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
4bb6b515 | 1436 | return; |
85b4aa49 RL |
1437 | } |
1438 | ||
85b4aa49 | 1439 | /** |
34f42a07 RL |
1440 | * fcoe_dev_setup() - setup link change notification interface |
1441 | */ | |
b0d428ad | 1442 | static void fcoe_dev_setup(void) |
85b4aa49 | 1443 | { |
85b4aa49 RL |
1444 | register_netdevice_notifier(&fcoe_notifier); |
1445 | } | |
1446 | ||
1447 | /** | |
b0d428ad | 1448 | * fcoe_dev_cleanup() - cleanup link change notification interface |
34f42a07 | 1449 | */ |
85b4aa49 RL |
1450 | static void fcoe_dev_cleanup(void) |
1451 | { | |
1452 | unregister_netdevice_notifier(&fcoe_notifier); | |
1453 | } | |
1454 | ||
1455 | /** | |
34f42a07 | 1456 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
1457 | * @notifier: context of the notification |
1458 | * @event: type of event | |
1459 | * @ptr: fixed array for output parsed ifname | |
1460 | * | |
1461 | * This function is called by the ethernet driver in case of link change event | |
1462 | * | |
1463 | * Returns: 0 for success | |
34f42a07 | 1464 | */ |
85b4aa49 RL |
1465 | static int fcoe_device_notification(struct notifier_block *notifier, |
1466 | ulong event, void *ptr) | |
1467 | { | |
1468 | struct fc_lport *lp = NULL; | |
1d1b88dc | 1469 | struct net_device *netdev = ptr; |
85b4aa49 RL |
1470 | struct fcoe_softc *fc; |
1471 | struct fcoe_dev_stats *stats; | |
97c8389d | 1472 | u32 link_possible = 1; |
85b4aa49 RL |
1473 | u32 mfs; |
1474 | int rc = NOTIFY_OK; | |
1475 | ||
1476 | read_lock(&fcoe_hostlist_lock); | |
1477 | list_for_each_entry(fc, &fcoe_hostlist, list) { | |
1d1b88dc | 1478 | if (fc->netdev == netdev) { |
97c8389d | 1479 | lp = fc->ctlr.lp; |
85b4aa49 RL |
1480 | break; |
1481 | } | |
1482 | } | |
1483 | read_unlock(&fcoe_hostlist_lock); | |
1484 | if (lp == NULL) { | |
1485 | rc = NOTIFY_DONE; | |
1486 | goto out; | |
1487 | } | |
1488 | ||
85b4aa49 RL |
1489 | switch (event) { |
1490 | case NETDEV_DOWN: | |
1491 | case NETDEV_GOING_DOWN: | |
97c8389d | 1492 | link_possible = 0; |
85b4aa49 RL |
1493 | break; |
1494 | case NETDEV_UP: | |
1495 | case NETDEV_CHANGE: | |
85b4aa49 RL |
1496 | break; |
1497 | case NETDEV_CHANGEMTU: | |
1d1b88dc VD |
1498 | mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + |
1499 | sizeof(struct fcoe_crc_eof)); | |
85b4aa49 RL |
1500 | if (mfs >= FC_MIN_MAX_FRAME) |
1501 | fc_set_mfs(lp, mfs); | |
85b4aa49 RL |
1502 | break; |
1503 | case NETDEV_REGISTER: | |
1504 | break; | |
1505 | default: | |
1d1b88dc | 1506 | FCOE_NETDEV_DBG(netdev, "Unknown event %ld " |
d5488eb9 | 1507 | "from netdev netlink\n", event); |
85b4aa49 | 1508 | } |
97c8389d JE |
1509 | if (link_possible && !fcoe_link_ok(lp)) |
1510 | fcoe_ctlr_link_up(&fc->ctlr); | |
1511 | else if (fcoe_ctlr_link_down(&fc->ctlr)) { | |
1512 | stats = fc_lport_get_stats(lp); | |
1513 | stats->LinkFailureCount++; | |
1514 | fcoe_clean_pending_queue(lp); | |
85b4aa49 RL |
1515 | } |
1516 | out: | |
1517 | return rc; | |
1518 | } | |
1519 | ||
1520 | /** | |
34f42a07 | 1521 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
1522 | * @buffer: incoming buffer to be copied |
1523 | * | |
dd3fd72e | 1524 | * Returns: NULL or ptr to net_device |
34f42a07 | 1525 | */ |
85b4aa49 RL |
1526 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
1527 | { | |
1528 | char *cp; | |
1529 | char ifname[IFNAMSIZ + 2]; | |
1530 | ||
1531 | if (buffer) { | |
1532 | strlcpy(ifname, buffer, IFNAMSIZ); | |
1533 | cp = ifname + strlen(ifname); | |
1534 | while (--cp >= ifname && *cp == '\n') | |
1535 | *cp = '\0'; | |
1536 | return dev_get_by_name(&init_net, ifname); | |
1537 | } | |
1538 | return NULL; | |
1539 | } | |
1540 | ||
1541 | /** | |
dd3fd72e | 1542 | * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev |
85b4aa49 RL |
1543 | * @netdev: the target netdev |
1544 | * | |
1545 | * Returns: ptr to the struct module, NULL for failure | |
34f42a07 | 1546 | */ |
b2ab99c9 RL |
1547 | static struct module * |
1548 | fcoe_netdev_to_module_owner(const struct net_device *netdev) | |
85b4aa49 RL |
1549 | { |
1550 | struct device *dev; | |
1551 | ||
1552 | if (!netdev) | |
1553 | return NULL; | |
1554 | ||
1555 | dev = netdev->dev.parent; | |
1556 | if (!dev) | |
1557 | return NULL; | |
1558 | ||
1559 | if (!dev->driver) | |
1560 | return NULL; | |
1561 | ||
1562 | return dev->driver->owner; | |
1563 | } | |
1564 | ||
1565 | /** | |
34f42a07 | 1566 | * fcoe_ethdrv_get() - Hold the Ethernet driver |
85b4aa49 RL |
1567 | * @netdev: the target netdev |
1568 | * | |
34f42a07 RL |
1569 | * Holds the Ethernet driver module by try_module_get() for |
1570 | * the corresponding netdev. | |
1571 | * | |
dd3fd72e | 1572 | * Returns: 0 for success |
34f42a07 | 1573 | */ |
85b4aa49 RL |
1574 | static int fcoe_ethdrv_get(const struct net_device *netdev) |
1575 | { | |
1576 | struct module *owner; | |
1577 | ||
1578 | owner = fcoe_netdev_to_module_owner(netdev); | |
1579 | if (owner) { | |
d5488eb9 RL |
1580 | FCOE_NETDEV_DBG(netdev, "Hold driver module %s\n", |
1581 | module_name(owner)); | |
85b4aa49 RL |
1582 | return try_module_get(owner); |
1583 | } | |
1584 | return -ENODEV; | |
1585 | } | |
1586 | ||
1587 | /** | |
34f42a07 | 1588 | * fcoe_ethdrv_put() - Release the Ethernet driver |
85b4aa49 RL |
1589 | * @netdev: the target netdev |
1590 | * | |
34f42a07 RL |
1591 | * Releases the Ethernet driver module by module_put for |
1592 | * the corresponding netdev. | |
1593 | * | |
dd3fd72e | 1594 | * Returns: 0 for success |
34f42a07 | 1595 | */ |
85b4aa49 RL |
1596 | static int fcoe_ethdrv_put(const struct net_device *netdev) |
1597 | { | |
1598 | struct module *owner; | |
1599 | ||
1600 | owner = fcoe_netdev_to_module_owner(netdev); | |
1601 | if (owner) { | |
d5488eb9 RL |
1602 | FCOE_NETDEV_DBG(netdev, "Release driver module %s\n", |
1603 | module_name(owner)); | |
85b4aa49 RL |
1604 | module_put(owner); |
1605 | return 0; | |
1606 | } | |
1607 | return -ENODEV; | |
1608 | } | |
1609 | ||
1610 | /** | |
34f42a07 | 1611 | * fcoe_destroy() - handles the destroy from sysfs |
dd3fd72e | 1612 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1613 | * @kp: associated kernel param |
1614 | * | |
1615 | * Returns: 0 for success | |
34f42a07 | 1616 | */ |
85b4aa49 RL |
1617 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
1618 | { | |
1619 | int rc; | |
1620 | struct net_device *netdev; | |
1621 | ||
1622 | netdev = fcoe_if_to_netdev(buffer); | |
1623 | if (!netdev) { | |
1624 | rc = -ENODEV; | |
1625 | goto out_nodev; | |
1626 | } | |
1627 | /* look for existing lport */ | |
1628 | if (!fcoe_hostlist_lookup(netdev)) { | |
1629 | rc = -ENODEV; | |
1630 | goto out_putdev; | |
1631 | } | |
7f349142 | 1632 | rc = fcoe_if_destroy(netdev); |
85b4aa49 | 1633 | if (rc) { |
d5488eb9 | 1634 | printk(KERN_ERR "fcoe: Failed to destroy interface (%s)\n", |
85b4aa49 RL |
1635 | netdev->name); |
1636 | rc = -EIO; | |
1637 | goto out_putdev; | |
1638 | } | |
1639 | fcoe_ethdrv_put(netdev); | |
1640 | rc = 0; | |
1641 | out_putdev: | |
1642 | dev_put(netdev); | |
1643 | out_nodev: | |
1644 | return rc; | |
1645 | } | |
1646 | ||
1647 | /** | |
34f42a07 | 1648 | * fcoe_create() - Handles the create call from sysfs |
dd3fd72e | 1649 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1650 | * @kp: associated kernel param |
1651 | * | |
1652 | * Returns: 0 for success | |
34f42a07 | 1653 | */ |
85b4aa49 RL |
1654 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1655 | { | |
1656 | int rc; | |
1657 | struct net_device *netdev; | |
1658 | ||
1659 | netdev = fcoe_if_to_netdev(buffer); | |
1660 | if (!netdev) { | |
1661 | rc = -ENODEV; | |
1662 | goto out_nodev; | |
1663 | } | |
1664 | /* look for existing lport */ | |
1665 | if (fcoe_hostlist_lookup(netdev)) { | |
1666 | rc = -EEXIST; | |
1667 | goto out_putdev; | |
1668 | } | |
1669 | fcoe_ethdrv_get(netdev); | |
1670 | ||
7f349142 | 1671 | rc = fcoe_if_create(netdev); |
85b4aa49 | 1672 | if (rc) { |
d5488eb9 | 1673 | printk(KERN_ERR "fcoe: Failed to create interface (%s)\n", |
85b4aa49 RL |
1674 | netdev->name); |
1675 | fcoe_ethdrv_put(netdev); | |
1676 | rc = -EIO; | |
1677 | goto out_putdev; | |
1678 | } | |
1679 | rc = 0; | |
1680 | out_putdev: | |
1681 | dev_put(netdev); | |
1682 | out_nodev: | |
1683 | return rc; | |
1684 | } | |
1685 | ||
1686 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1687 | __MODULE_PARM_TYPE(create, "string"); | |
1688 | MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); | |
1689 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); | |
1690 | __MODULE_PARM_TYPE(destroy, "string"); | |
1691 | MODULE_PARM_DESC(destroy, "Destroy fcoe port"); | |
1692 | ||
34f42a07 RL |
1693 | /** |
1694 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1695 | * @lp: ptr to the fc_lport |
1696 | * | |
1697 | * Any permanently-disqualifying conditions have been previously checked. | |
1698 | * This also updates the speed setting, which may change with link for 100/1000. | |
1699 | * | |
1700 | * This function should probably be checking for PAUSE support at some point | |
1701 | * in the future. Currently Per-priority-pause is not determinable using | |
1702 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1703 | * | |
1704 | * Returns: 0 if link is OK for use by FCoE. | |
1705 | * | |
1706 | */ | |
1707 | int fcoe_link_ok(struct fc_lport *lp) | |
1708 | { | |
fc47ff6b | 1709 | struct fcoe_softc *fc = lport_priv(lp); |
1d1b88dc | 1710 | struct net_device *dev = fc->netdev; |
85b4aa49 | 1711 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; |
85b4aa49 | 1712 | |
2f718d64 YZ |
1713 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && |
1714 | (!dev_ethtool_get_settings(dev, &ecmd))) { | |
1715 | lp->link_supported_speeds &= | |
1716 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1717 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1718 | SUPPORTED_1000baseT_Full)) | |
1719 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1720 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1721 | lp->link_supported_speeds |= | |
1722 | FC_PORTSPEED_10GBIT; | |
1723 | if (ecmd.speed == SPEED_1000) | |
1724 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1725 | if (ecmd.speed == SPEED_10000) | |
1726 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
85b4aa49 | 1727 | |
2f718d64 YZ |
1728 | return 0; |
1729 | } | |
1730 | return -1; | |
85b4aa49 | 1731 | } |
85b4aa49 | 1732 | |
34f42a07 RL |
1733 | /** |
1734 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 RL |
1735 | * @lp: the fc_lport |
1736 | */ | |
1737 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1738 | { | |
85b4aa49 RL |
1739 | struct fcoe_percpu_s *pp; |
1740 | struct fcoe_rcv_info *fr; | |
1741 | struct sk_buff_head *list; | |
1742 | struct sk_buff *skb, *next; | |
1743 | struct sk_buff *head; | |
5e5e92df | 1744 | unsigned int cpu; |
85b4aa49 | 1745 | |
5e5e92df RL |
1746 | for_each_possible_cpu(cpu) { |
1747 | pp = &per_cpu(fcoe_percpu, cpu); | |
1748 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1749 | list = &pp->fcoe_rx_list; | |
1750 | head = list->next; | |
1751 | for (skb = head; skb != (struct sk_buff *)list; | |
1752 | skb = next) { | |
1753 | next = skb->next; | |
1754 | fr = fcoe_dev_from_skb(skb); | |
1755 | if (fr->fr_dev == lp) { | |
1756 | __skb_unlink(skb, list); | |
1757 | kfree_skb(skb); | |
85b4aa49 | 1758 | } |
85b4aa49 | 1759 | } |
5e5e92df | 1760 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
85b4aa49 RL |
1761 | } |
1762 | } | |
85b4aa49 RL |
1763 | |
1764 | /** | |
34f42a07 | 1765 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1766 | * @lp: the corresponding fc_lport |
1767 | * | |
1768 | * Returns: none | |
34f42a07 | 1769 | */ |
85b4aa49 RL |
1770 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1771 | { | |
1772 | struct fcoe_softc *fc = lport_priv(lp); | |
1773 | struct sk_buff *skb; | |
1774 | ||
1775 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1776 | while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { | |
1777 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1778 | kfree_skb(skb); | |
1779 | spin_lock_bh(&fc->fcoe_pending_queue.lock); | |
1780 | } | |
1781 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); | |
1782 | } | |
85b4aa49 | 1783 | |
34f42a07 RL |
1784 | /** |
1785 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
1786 | * @shost: shost the reset is from |
1787 | * | |
1788 | * Returns: always 0 | |
1789 | */ | |
1790 | int fcoe_reset(struct Scsi_Host *shost) | |
1791 | { | |
1792 | struct fc_lport *lport = shost_priv(shost); | |
1793 | fc_lport_reset(lport); | |
1794 | return 0; | |
1795 | } | |
85b4aa49 | 1796 | |
34f42a07 RL |
1797 | /** |
1798 | * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device | |
dd3fd72e | 1799 | * @dev: this is currently ptr to net_device |
85b4aa49 | 1800 | * |
e8af4d43 VD |
1801 | * Called with fcoe_hostlist_lock held. |
1802 | * | |
85b4aa49 RL |
1803 | * Returns: NULL or the located fcoe_softc |
1804 | */ | |
b2ab99c9 RL |
1805 | static struct fcoe_softc * |
1806 | fcoe_hostlist_lookup_softc(const struct net_device *dev) | |
85b4aa49 RL |
1807 | { |
1808 | struct fcoe_softc *fc; | |
1809 | ||
85b4aa49 | 1810 | list_for_each_entry(fc, &fcoe_hostlist, list) { |
1d1b88dc | 1811 | if (fc->netdev == dev) |
85b4aa49 | 1812 | return fc; |
85b4aa49 | 1813 | } |
85b4aa49 RL |
1814 | return NULL; |
1815 | } | |
1816 | ||
34f42a07 RL |
1817 | /** |
1818 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
1819 | * @netdev: ptr to net_device |
1820 | * | |
1821 | * Returns: 0 for success | |
1822 | */ | |
1823 | struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) | |
1824 | { | |
1825 | struct fcoe_softc *fc; | |
1826 | ||
e8af4d43 | 1827 | read_lock(&fcoe_hostlist_lock); |
85b4aa49 | 1828 | fc = fcoe_hostlist_lookup_softc(netdev); |
e8af4d43 | 1829 | read_unlock(&fcoe_hostlist_lock); |
85b4aa49 | 1830 | |
97c8389d | 1831 | return (fc) ? fc->ctlr.lp : NULL; |
85b4aa49 | 1832 | } |
85b4aa49 | 1833 | |
34f42a07 RL |
1834 | /** |
1835 | * fcoe_hostlist_add() - Add a lport to lports list | |
dd3fd72e | 1836 | * @lp: ptr to the fc_lport to be added |
85b4aa49 | 1837 | * |
e8af4d43 VD |
1838 | * Called with write fcoe_hostlist_lock held. |
1839 | * | |
85b4aa49 RL |
1840 | * Returns: 0 for success |
1841 | */ | |
1842 | int fcoe_hostlist_add(const struct fc_lport *lp) | |
1843 | { | |
1844 | struct fcoe_softc *fc; | |
1845 | ||
1846 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); | |
1847 | if (!fc) { | |
fc47ff6b | 1848 | fc = lport_priv(lp); |
85b4aa49 | 1849 | list_add_tail(&fc->list, &fcoe_hostlist); |
85b4aa49 RL |
1850 | } |
1851 | return 0; | |
1852 | } | |
85b4aa49 | 1853 | |
34f42a07 RL |
1854 | /** |
1855 | * fcoe_hostlist_remove() - remove a lport from lports list | |
dd3fd72e | 1856 | * @lp: ptr to the fc_lport to be removed |
85b4aa49 RL |
1857 | * |
1858 | * Returns: 0 for success | |
1859 | */ | |
1860 | int fcoe_hostlist_remove(const struct fc_lport *lp) | |
1861 | { | |
1862 | struct fcoe_softc *fc; | |
1863 | ||
e8af4d43 | 1864 | write_lock_bh(&fcoe_hostlist_lock); |
85b4aa49 RL |
1865 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); |
1866 | BUG_ON(!fc); | |
85b4aa49 RL |
1867 | list_del(&fc->list); |
1868 | write_unlock_bh(&fcoe_hostlist_lock); | |
1869 | ||
1870 | return 0; | |
1871 | } | |
85b4aa49 | 1872 | |
85b4aa49 | 1873 | /** |
34f42a07 | 1874 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 | 1875 | * |
85b4aa49 | 1876 | * Returns 0 on success, negative on failure |
34f42a07 | 1877 | */ |
85b4aa49 RL |
1878 | static int __init fcoe_init(void) |
1879 | { | |
38eccabd | 1880 | unsigned int cpu; |
8976f424 | 1881 | int rc = 0; |
85b4aa49 RL |
1882 | struct fcoe_percpu_s *p; |
1883 | ||
85b4aa49 RL |
1884 | INIT_LIST_HEAD(&fcoe_hostlist); |
1885 | rwlock_init(&fcoe_hostlist_lock); | |
1886 | ||
38eccabd | 1887 | for_each_possible_cpu(cpu) { |
5e5e92df | 1888 | p = &per_cpu(fcoe_percpu, cpu); |
38eccabd RL |
1889 | skb_queue_head_init(&p->fcoe_rx_list); |
1890 | } | |
1891 | ||
8976f424 RL |
1892 | for_each_online_cpu(cpu) |
1893 | fcoe_percpu_thread_create(cpu); | |
85b4aa49 | 1894 | |
8976f424 RL |
1895 | /* Initialize per CPU interrupt thread */ |
1896 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); | |
1897 | if (rc) | |
1898 | goto out_free; | |
85b4aa49 | 1899 | |
8976f424 | 1900 | /* Setup link change notification */ |
85b4aa49 RL |
1901 | fcoe_dev_setup(); |
1902 | ||
7f349142 | 1903 | fcoe_if_init(); |
85b4aa49 RL |
1904 | |
1905 | return 0; | |
8976f424 RL |
1906 | |
1907 | out_free: | |
1908 | for_each_online_cpu(cpu) { | |
1909 | fcoe_percpu_thread_destroy(cpu); | |
1910 | } | |
1911 | ||
1912 | return rc; | |
85b4aa49 RL |
1913 | } |
1914 | module_init(fcoe_init); | |
1915 | ||
1916 | /** | |
34f42a07 | 1917 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
1918 | * |
1919 | * Returns 0 on success, negative on failure | |
34f42a07 | 1920 | */ |
85b4aa49 RL |
1921 | static void __exit fcoe_exit(void) |
1922 | { | |
5e5e92df | 1923 | unsigned int cpu; |
85b4aa49 | 1924 | struct fcoe_softc *fc, *tmp; |
85b4aa49 | 1925 | |
85b4aa49 RL |
1926 | fcoe_dev_cleanup(); |
1927 | ||
5919a595 | 1928 | /* releases the associated fcoe hosts */ |
85b4aa49 | 1929 | list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
1d1b88dc | 1930 | fcoe_if_destroy(fc->netdev); |
85b4aa49 | 1931 | |
8976f424 RL |
1932 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
1933 | ||
1934 | for_each_online_cpu(cpu) { | |
1935 | fcoe_percpu_thread_destroy(cpu); | |
85b4aa49 RL |
1936 | } |
1937 | ||
7f349142 VD |
1938 | /* detach from scsi transport */ |
1939 | fcoe_if_exit(); | |
85b4aa49 RL |
1940 | } |
1941 | module_exit(fcoe_exit); |