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