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85b4aa49 | 1 | /* |
af7f85d9 | 2 | * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. |
85b4aa49 RL |
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 | ||
dfc1d0fe CL |
58 | DEFINE_MUTEX(fcoe_config_mutex); |
59 | ||
e7a51997 JE |
60 | /* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */ |
61 | static DECLARE_COMPLETION(fcoe_flush_completion); | |
62 | ||
85b4aa49 | 63 | /* fcoe host list */ |
090eb6c4 | 64 | /* must only by accessed under the RTNL mutex */ |
85b4aa49 | 65 | LIST_HEAD(fcoe_hostlist); |
5e5e92df | 66 | DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
85b4aa49 | 67 | |
dd3fd72e | 68 | /* Function Prototypes */ |
fdd78027 VD |
69 | static int fcoe_reset(struct Scsi_Host *shost); |
70 | static int fcoe_xmit(struct fc_lport *, struct fc_frame *); | |
71 | static int fcoe_rcv(struct sk_buff *, struct net_device *, | |
72 | struct packet_type *, struct net_device *); | |
73 | static int fcoe_percpu_receive_thread(void *arg); | |
74 | static void fcoe_clean_pending_queue(struct fc_lport *lp); | |
75 | static void fcoe_percpu_clean(struct fc_lport *lp); | |
76 | static int fcoe_link_ok(struct fc_lport *lp); | |
77 | ||
78 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); | |
79 | static int fcoe_hostlist_add(const struct fc_lport *); | |
fdd78027 | 80 | |
4bb6b515 | 81 | static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *); |
85b4aa49 RL |
82 | static int fcoe_device_notification(struct notifier_block *, ulong, void *); |
83 | static void fcoe_dev_setup(void); | |
84 | static void fcoe_dev_cleanup(void); | |
2e70e241 CL |
85 | static struct fcoe_interface * |
86 | fcoe_hostlist_lookup_port(const struct net_device *dev); | |
85b4aa49 RL |
87 | |
88 | /* notification function from net device */ | |
89 | static struct notifier_block fcoe_notifier = { | |
90 | .notifier_call = fcoe_device_notification, | |
91 | }; | |
92 | ||
e9084bb8 CL |
93 | static struct scsi_transport_template *fcoe_transport_template; |
94 | static struct scsi_transport_template *fcoe_vport_transport_template; | |
7f349142 | 95 | |
9a05753b CL |
96 | static int fcoe_vport_destroy(struct fc_vport *vport); |
97 | static int fcoe_vport_create(struct fc_vport *vport, bool disabled); | |
98 | static int fcoe_vport_disable(struct fc_vport *vport, bool disable); | |
dc8596d3 | 99 | static void fcoe_set_vport_symbolic_name(struct fc_vport *vport); |
9a05753b | 100 | |
7f349142 VD |
101 | struct fc_function_template fcoe_transport_function = { |
102 | .show_host_node_name = 1, | |
103 | .show_host_port_name = 1, | |
104 | .show_host_supported_classes = 1, | |
105 | .show_host_supported_fc4s = 1, | |
106 | .show_host_active_fc4s = 1, | |
107 | .show_host_maxframe_size = 1, | |
108 | ||
109 | .show_host_port_id = 1, | |
110 | .show_host_supported_speeds = 1, | |
111 | .get_host_speed = fc_get_host_speed, | |
112 | .show_host_speed = 1, | |
113 | .show_host_port_type = 1, | |
114 | .get_host_port_state = fc_get_host_port_state, | |
115 | .show_host_port_state = 1, | |
116 | .show_host_symbolic_name = 1, | |
117 | ||
118 | .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), | |
119 | .show_rport_maxframe_size = 1, | |
120 | .show_rport_supported_classes = 1, | |
121 | ||
122 | .show_host_fabric_name = 1, | |
123 | .show_starget_node_name = 1, | |
124 | .show_starget_port_name = 1, | |
125 | .show_starget_port_id = 1, | |
126 | .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, | |
127 | .show_rport_dev_loss_tmo = 1, | |
128 | .get_fc_host_stats = fc_get_host_stats, | |
129 | .issue_fc_host_lip = fcoe_reset, | |
130 | ||
131 | .terminate_rport_io = fc_rport_terminate_io, | |
9a05753b CL |
132 | |
133 | .vport_create = fcoe_vport_create, | |
134 | .vport_delete = fcoe_vport_destroy, | |
135 | .vport_disable = fcoe_vport_disable, | |
dc8596d3 | 136 | .set_vport_symbolic_name = fcoe_set_vport_symbolic_name, |
7f349142 VD |
137 | }; |
138 | ||
e9084bb8 CL |
139 | struct fc_function_template fcoe_vport_transport_function = { |
140 | .show_host_node_name = 1, | |
141 | .show_host_port_name = 1, | |
142 | .show_host_supported_classes = 1, | |
143 | .show_host_supported_fc4s = 1, | |
144 | .show_host_active_fc4s = 1, | |
145 | .show_host_maxframe_size = 1, | |
146 | ||
147 | .show_host_port_id = 1, | |
148 | .show_host_supported_speeds = 1, | |
149 | .get_host_speed = fc_get_host_speed, | |
150 | .show_host_speed = 1, | |
151 | .show_host_port_type = 1, | |
152 | .get_host_port_state = fc_get_host_port_state, | |
153 | .show_host_port_state = 1, | |
154 | .show_host_symbolic_name = 1, | |
155 | ||
156 | .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), | |
157 | .show_rport_maxframe_size = 1, | |
158 | .show_rport_supported_classes = 1, | |
159 | ||
160 | .show_host_fabric_name = 1, | |
161 | .show_starget_node_name = 1, | |
162 | .show_starget_port_name = 1, | |
163 | .show_starget_port_id = 1, | |
164 | .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, | |
165 | .show_rport_dev_loss_tmo = 1, | |
166 | .get_fc_host_stats = fc_get_host_stats, | |
167 | .issue_fc_host_lip = fcoe_reset, | |
168 | ||
169 | .terminate_rport_io = fc_rport_terminate_io, | |
170 | }; | |
171 | ||
7f349142 VD |
172 | static struct scsi_host_template fcoe_shost_template = { |
173 | .module = THIS_MODULE, | |
174 | .name = "FCoE Driver", | |
175 | .proc_name = FCOE_NAME, | |
176 | .queuecommand = fc_queuecommand, | |
177 | .eh_abort_handler = fc_eh_abort, | |
178 | .eh_device_reset_handler = fc_eh_device_reset, | |
179 | .eh_host_reset_handler = fc_eh_host_reset, | |
180 | .slave_alloc = fc_slave_alloc, | |
181 | .change_queue_depth = fc_change_queue_depth, | |
182 | .change_queue_type = fc_change_queue_type, | |
183 | .this_id = -1, | |
14caf44c | 184 | .cmd_per_lun = 3, |
7f349142 VD |
185 | .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, |
186 | .use_clustering = ENABLE_CLUSTERING, | |
187 | .sg_tablesize = SG_ALL, | |
188 | .max_sectors = 0xffff, | |
189 | }; | |
190 | ||
54b649f8 CL |
191 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, |
192 | struct packet_type *ptype, | |
193 | struct net_device *orig_dev); | |
194 | /** | |
195 | * fcoe_interface_setup() | |
196 | * @fcoe: new fcoe_interface | |
197 | * @netdev : ptr to the associated netdevice struct | |
198 | * | |
199 | * Returns : 0 for success | |
2e70e241 | 200 | * Locking: must be called with the RTNL mutex held |
54b649f8 CL |
201 | */ |
202 | static int fcoe_interface_setup(struct fcoe_interface *fcoe, | |
203 | struct net_device *netdev) | |
204 | { | |
205 | struct fcoe_ctlr *fip = &fcoe->ctlr; | |
206 | struct netdev_hw_addr *ha; | |
207 | u8 flogi_maddr[ETH_ALEN]; | |
b7a727f1 | 208 | const struct net_device_ops *ops; |
54b649f8 CL |
209 | |
210 | fcoe->netdev = netdev; | |
211 | ||
b7a727f1 YZ |
212 | /* Let LLD initialize for FCoE */ |
213 | ops = netdev->netdev_ops; | |
214 | if (ops->ndo_fcoe_enable) { | |
215 | if (ops->ndo_fcoe_enable(netdev)) | |
216 | FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE" | |
217 | " specific feature for LLD.\n"); | |
218 | } | |
219 | ||
54b649f8 CL |
220 | /* Do not support for bonding device */ |
221 | if ((netdev->priv_flags & IFF_MASTER_ALB) || | |
222 | (netdev->priv_flags & IFF_SLAVE_INACTIVE) || | |
223 | (netdev->priv_flags & IFF_MASTER_8023AD)) { | |
224 | return -EOPNOTSUPP; | |
225 | } | |
226 | ||
227 | /* look for SAN MAC address, if multiple SAN MACs exist, only | |
228 | * use the first one for SPMA */ | |
229 | rcu_read_lock(); | |
230 | for_each_dev_addr(netdev, ha) { | |
231 | if ((ha->type == NETDEV_HW_ADDR_T_SAN) && | |
232 | (is_valid_ether_addr(fip->ctl_src_addr))) { | |
233 | memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN); | |
234 | fip->spma = 1; | |
235 | break; | |
236 | } | |
237 | } | |
238 | rcu_read_unlock(); | |
239 | ||
240 | /* setup Source Mac Address */ | |
241 | if (!fip->spma) | |
242 | memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len); | |
243 | ||
244 | /* | |
245 | * Add FCoE MAC address as second unicast MAC address | |
246 | * or enter promiscuous mode if not capable of listening | |
247 | * for multiple unicast MACs. | |
248 | */ | |
54b649f8 CL |
249 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); |
250 | dev_unicast_add(netdev, flogi_maddr); | |
251 | if (fip->spma) | |
252 | dev_unicast_add(netdev, fip->ctl_src_addr); | |
253 | dev_mc_add(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); | |
54b649f8 CL |
254 | |
255 | /* | |
256 | * setup the receive function from ethernet driver | |
257 | * on the ethertype for the given device | |
258 | */ | |
259 | fcoe->fcoe_packet_type.func = fcoe_rcv; | |
260 | fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); | |
261 | fcoe->fcoe_packet_type.dev = netdev; | |
262 | dev_add_pack(&fcoe->fcoe_packet_type); | |
263 | ||
264 | fcoe->fip_packet_type.func = fcoe_fip_recv; | |
265 | fcoe->fip_packet_type.type = htons(ETH_P_FIP); | |
266 | fcoe->fip_packet_type.dev = netdev; | |
267 | dev_add_pack(&fcoe->fip_packet_type); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb); | |
11b56188 CL |
273 | static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr); |
274 | static u8 *fcoe_get_src_mac(struct fc_lport *lport); | |
2e70e241 | 275 | static void fcoe_destroy_work(struct work_struct *work); |
54b649f8 | 276 | |
030f4e00 CL |
277 | /** |
278 | * fcoe_interface_create() | |
279 | * @netdev: network interface | |
280 | * | |
281 | * Returns: pointer to a struct fcoe_interface or NULL on error | |
282 | */ | |
283 | static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev) | |
284 | { | |
285 | struct fcoe_interface *fcoe; | |
286 | ||
287 | fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL); | |
288 | if (!fcoe) { | |
289 | FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n"); | |
290 | return NULL; | |
291 | } | |
292 | ||
2e70e241 | 293 | dev_hold(netdev); |
030f4e00 | 294 | kref_init(&fcoe->kref); |
54b649f8 CL |
295 | |
296 | /* | |
297 | * Initialize FIP. | |
298 | */ | |
299 | fcoe_ctlr_init(&fcoe->ctlr); | |
300 | fcoe->ctlr.send = fcoe_fip_send; | |
301 | fcoe->ctlr.update_mac = fcoe_update_src_mac; | |
11b56188 | 302 | fcoe->ctlr.get_src_addr = fcoe_get_src_mac; |
54b649f8 CL |
303 | |
304 | fcoe_interface_setup(fcoe, netdev); | |
030f4e00 CL |
305 | |
306 | return fcoe; | |
307 | } | |
308 | ||
54b649f8 CL |
309 | /** |
310 | * fcoe_interface_cleanup() - clean up netdev configurations | |
311 | * @fcoe: | |
2e70e241 CL |
312 | * |
313 | * Caller must be holding the RTNL mutex | |
54b649f8 CL |
314 | */ |
315 | void fcoe_interface_cleanup(struct fcoe_interface *fcoe) | |
316 | { | |
317 | struct net_device *netdev = fcoe->netdev; | |
318 | struct fcoe_ctlr *fip = &fcoe->ctlr; | |
319 | u8 flogi_maddr[ETH_ALEN]; | |
b7a727f1 | 320 | const struct net_device_ops *ops; |
54b649f8 CL |
321 | |
322 | /* | |
323 | * Don't listen for Ethernet packets anymore. | |
324 | * synchronize_net() ensures that the packet handlers are not running | |
325 | * on another CPU. dev_remove_pack() would do that, this calls the | |
326 | * unsyncronized version __dev_remove_pack() to avoid multiple delays. | |
327 | */ | |
328 | __dev_remove_pack(&fcoe->fcoe_packet_type); | |
329 | __dev_remove_pack(&fcoe->fip_packet_type); | |
330 | synchronize_net(); | |
331 | ||
54b649f8 | 332 | /* Delete secondary MAC addresses */ |
54b649f8 CL |
333 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); |
334 | dev_unicast_delete(netdev, flogi_maddr); | |
54b649f8 CL |
335 | if (fip->spma) |
336 | dev_unicast_delete(netdev, fip->ctl_src_addr); | |
337 | dev_mc_delete(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); | |
b7a727f1 YZ |
338 | |
339 | /* Tell the LLD we are done w/ FCoE */ | |
340 | ops = netdev->netdev_ops; | |
341 | if (ops->ndo_fcoe_disable) { | |
342 | if (ops->ndo_fcoe_disable(netdev)) | |
343 | FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" | |
344 | " specific feature for LLD.\n"); | |
345 | } | |
54b649f8 CL |
346 | } |
347 | ||
030f4e00 CL |
348 | /** |
349 | * fcoe_interface_release() - fcoe_port kref release function | |
350 | * @kref: embedded reference count in an fcoe_interface struct | |
351 | */ | |
352 | static void fcoe_interface_release(struct kref *kref) | |
353 | { | |
354 | struct fcoe_interface *fcoe; | |
2e70e241 | 355 | struct net_device *netdev; |
030f4e00 CL |
356 | |
357 | fcoe = container_of(kref, struct fcoe_interface, kref); | |
2e70e241 CL |
358 | netdev = fcoe->netdev; |
359 | /* tear-down the FCoE controller */ | |
360 | fcoe_ctlr_destroy(&fcoe->ctlr); | |
030f4e00 | 361 | kfree(fcoe); |
2e70e241 | 362 | dev_put(netdev); |
030f4e00 CL |
363 | } |
364 | ||
365 | /** | |
366 | * fcoe_interface_get() | |
367 | * @fcoe: | |
368 | */ | |
369 | static inline void fcoe_interface_get(struct fcoe_interface *fcoe) | |
370 | { | |
371 | kref_get(&fcoe->kref); | |
372 | } | |
373 | ||
374 | /** | |
375 | * fcoe_interface_put() | |
376 | * @fcoe: | |
377 | */ | |
378 | static inline void fcoe_interface_put(struct fcoe_interface *fcoe) | |
379 | { | |
380 | kref_put(&fcoe->kref, fcoe_interface_release); | |
381 | } | |
382 | ||
ab6b85c1 VD |
383 | /** |
384 | * fcoe_fip_recv - handle a received FIP frame. | |
385 | * @skb: the receive skb | |
386 | * @dev: associated &net_device | |
387 | * @ptype: the &packet_type structure which was used to register this handler. | |
388 | * @orig_dev: original receive &net_device, in case @dev is a bond. | |
389 | * | |
390 | * Returns: 0 for success | |
391 | */ | |
392 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, | |
393 | struct packet_type *ptype, | |
394 | struct net_device *orig_dev) | |
395 | { | |
259ad85d | 396 | struct fcoe_interface *fcoe; |
ab6b85c1 | 397 | |
259ad85d | 398 | fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type); |
3fe9a0ba | 399 | fcoe_ctlr_recv(&fcoe->ctlr, skb); |
ab6b85c1 VD |
400 | return 0; |
401 | } | |
402 | ||
403 | /** | |
404 | * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame. | |
405 | * @fip: FCoE controller. | |
406 | * @skb: FIP Packet. | |
407 | */ | |
408 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
409 | { | |
3fe9a0ba | 410 | skb->dev = fcoe_from_ctlr(fip)->netdev; |
ab6b85c1 VD |
411 | dev_queue_xmit(skb); |
412 | } | |
413 | ||
414 | /** | |
415 | * fcoe_update_src_mac() - Update Ethernet MAC filters. | |
11b56188 CL |
416 | * @lport: libfc lport |
417 | * @addr: Unicast MAC address to add. | |
ab6b85c1 VD |
418 | * |
419 | * Remove any previously-set unicast MAC filter. | |
420 | * Add secondary FCoE MAC address filter for our OUI. | |
421 | */ | |
11b56188 | 422 | static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr) |
ab6b85c1 | 423 | { |
11b56188 CL |
424 | struct fcoe_port *port = lport_priv(lport); |
425 | struct fcoe_interface *fcoe = port->fcoe; | |
25024989 | 426 | |
ab6b85c1 | 427 | rtnl_lock(); |
11b56188 CL |
428 | if (!is_zero_ether_addr(port->data_src_addr)) |
429 | dev_unicast_delete(fcoe->netdev, port->data_src_addr); | |
430 | if (!is_zero_ether_addr(addr)) | |
431 | dev_unicast_add(fcoe->netdev, addr); | |
432 | memcpy(port->data_src_addr, addr, ETH_ALEN); | |
ab6b85c1 VD |
433 | rtnl_unlock(); |
434 | } | |
435 | ||
11b56188 CL |
436 | /** |
437 | * fcoe_get_src_mac() - return the Ethernet source address for an lport | |
438 | * @lport: libfc lport | |
439 | */ | |
440 | static u8 *fcoe_get_src_mac(struct fc_lport *lport) | |
441 | { | |
442 | struct fcoe_port *port = lport_priv(lport); | |
443 | ||
444 | return port->data_src_addr; | |
445 | } | |
446 | ||
7f349142 VD |
447 | /** |
448 | * fcoe_lport_config() - sets up the fc_lport | |
449 | * @lp: ptr to the fc_lport | |
7f349142 VD |
450 | * |
451 | * Returns: 0 for success | |
452 | */ | |
453 | static int fcoe_lport_config(struct fc_lport *lp) | |
454 | { | |
455 | lp->link_up = 0; | |
456 | lp->qfull = 0; | |
457 | lp->max_retry_count = 3; | |
a3666955 | 458 | lp->max_rport_retry_count = 3; |
7f349142 VD |
459 | lp->e_d_tov = 2 * 1000; /* FC-FS default */ |
460 | lp->r_a_tov = 2 * 2 * 1000; | |
461 | lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | | |
462 | FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); | |
9a05753b | 463 | lp->does_npiv = 1; |
7f349142 VD |
464 | |
465 | fc_lport_init_stats(lp); | |
466 | ||
467 | /* lport fc_lport related configuration */ | |
468 | fc_lport_config(lp); | |
469 | ||
470 | /* offload related configuration */ | |
471 | lp->crc_offload = 0; | |
472 | lp->seq_offload = 0; | |
473 | lp->lro_enabled = 0; | |
474 | lp->lro_xid = 0; | |
475 | lp->lso_max = 0; | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
1047f221 VD |
480 | /** |
481 | * fcoe_queue_timer() - fcoe queue timer | |
482 | * @lp: the fc_lport pointer | |
483 | * | |
484 | * Calls fcoe_check_wait_queue on timeout | |
485 | * | |
486 | */ | |
487 | static void fcoe_queue_timer(ulong lp) | |
488 | { | |
489 | fcoe_check_wait_queue((struct fc_lport *)lp, NULL); | |
490 | } | |
491 | ||
7f349142 VD |
492 | /** |
493 | * fcoe_netdev_config() - Set up netdev for SW FCoE | |
494 | * @lp : ptr to the fc_lport | |
495 | * @netdev : ptr to the associated netdevice struct | |
496 | * | |
497 | * Must be called after fcoe_lport_config() as it will use lport mutex | |
498 | * | |
499 | * Returns : 0 for success | |
500 | */ | |
501 | static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) | |
502 | { | |
503 | u32 mfs; | |
504 | u64 wwnn, wwpn; | |
25024989 | 505 | struct fcoe_interface *fcoe; |
014f5c3f | 506 | struct fcoe_port *port; |
7f349142 VD |
507 | |
508 | /* Setup lport private data to point to fcoe softc */ | |
014f5c3f | 509 | port = lport_priv(lp); |
25024989 | 510 | fcoe = port->fcoe; |
7f349142 VD |
511 | |
512 | /* | |
513 | * Determine max frame size based on underlying device and optional | |
514 | * user-configured limit. If the MFS is too low, fcoe_link_ok() | |
515 | * will return 0, so do this first. | |
516 | */ | |
7221d7e5 YZ |
517 | mfs = netdev->mtu; |
518 | if (netdev->features & NETIF_F_FCOE_MTU) { | |
519 | mfs = FCOE_MTU; | |
520 | FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs); | |
521 | } | |
522 | mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); | |
7f349142 VD |
523 | if (fc_set_mfs(lp, mfs)) |
524 | return -EINVAL; | |
525 | ||
7f349142 | 526 | /* offload features support */ |
1d1b88dc | 527 | if (netdev->features & NETIF_F_SG) |
7f349142 VD |
528 | lp->sg_supp = 1; |
529 | ||
7f349142 VD |
530 | if (netdev->features & NETIF_F_FCOE_CRC) { |
531 | lp->crc_offload = 1; | |
d5488eb9 | 532 | FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); |
7f349142 | 533 | } |
7f349142 VD |
534 | if (netdev->features & NETIF_F_FSO) { |
535 | lp->seq_offload = 1; | |
536 | lp->lso_max = netdev->gso_max_size; | |
d5488eb9 RL |
537 | FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", |
538 | lp->lso_max); | |
7f349142 | 539 | } |
7f349142 VD |
540 | if (netdev->fcoe_ddp_xid) { |
541 | lp->lro_enabled = 1; | |
542 | lp->lro_xid = netdev->fcoe_ddp_xid; | |
d5488eb9 RL |
543 | FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", |
544 | lp->lro_xid); | |
7f349142 | 545 | } |
014f5c3f CL |
546 | skb_queue_head_init(&port->fcoe_pending_queue); |
547 | port->fcoe_pending_queue_active = 0; | |
548 | setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lp); | |
7f349142 | 549 | |
9a05753b CL |
550 | if (!lp->vport) { |
551 | wwnn = fcoe_wwn_from_mac(netdev->dev_addr, 1, 0); | |
552 | fc_set_wwnn(lp, wwnn); | |
553 | /* XXX - 3rd arg needs to be vlan id */ | |
554 | wwpn = fcoe_wwn_from_mac(netdev->dev_addr, 2, 0); | |
555 | fc_set_wwpn(lp, wwpn); | |
556 | } | |
7f349142 | 557 | |
7f349142 VD |
558 | return 0; |
559 | } | |
560 | ||
561 | /** | |
562 | * fcoe_shost_config() - Sets up fc_lport->host | |
563 | * @lp : ptr to the fc_lport | |
564 | * @shost : ptr to the associated scsi host | |
565 | * @dev : device associated to scsi host | |
566 | * | |
567 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() | |
568 | * | |
569 | * Returns : 0 for success | |
570 | */ | |
571 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, | |
572 | struct device *dev) | |
573 | { | |
574 | int rc = 0; | |
575 | ||
576 | /* lport scsi host config */ | |
7f349142 VD |
577 | lp->host->max_lun = FCOE_MAX_LUN; |
578 | lp->host->max_id = FCOE_MAX_FCP_TARGET; | |
579 | lp->host->max_channel = 0; | |
e9084bb8 CL |
580 | if (lp->vport) |
581 | lp->host->transportt = fcoe_vport_transport_template; | |
582 | else | |
583 | lp->host->transportt = fcoe_transport_template; | |
7f349142 VD |
584 | |
585 | /* add the new host to the SCSI-ml */ | |
586 | rc = scsi_add_host(lp->host, dev); | |
587 | if (rc) { | |
d5488eb9 RL |
588 | FCOE_NETDEV_DBG(fcoe_netdev(lp), "fcoe_shost_config: " |
589 | "error on scsi_add_host\n"); | |
7f349142 VD |
590 | return rc; |
591 | } | |
9a05753b CL |
592 | |
593 | if (!lp->vport) | |
594 | fc_host_max_npiv_vports(lp->host) = USHORT_MAX; | |
595 | ||
5baa17c3 CL |
596 | snprintf(fc_host_symbolic_name(lp->host), FC_SYMBOLIC_NAME_SIZE, |
597 | "%s v%s over %s", FCOE_NAME, FCOE_VERSION, | |
598 | fcoe_netdev(lp)->name); | |
7f349142 VD |
599 | |
600 | return 0; | |
601 | } | |
602 | ||
d7179680 VD |
603 | /* |
604 | * fcoe_oem_match() - match for read types IO | |
605 | * @fp: the fc_frame for new IO. | |
606 | * | |
607 | * Returns : true for read types IO, otherwise returns false. | |
608 | */ | |
609 | bool fcoe_oem_match(struct fc_frame *fp) | |
610 | { | |
05cc7390 YZ |
611 | return fc_fcp_is_read(fr_fsp(fp)) && |
612 | (fr_fsp(fp)->data_len > fcoe_ddp_min); | |
d7179680 VD |
613 | } |
614 | ||
7f349142 VD |
615 | /** |
616 | * fcoe_em_config() - allocates em for this lport | |
014f5c3f | 617 | * @lp: the fcoe that em is to allocated for |
7f349142 VD |
618 | * |
619 | * Returns : 0 on success | |
620 | */ | |
621 | static inline int fcoe_em_config(struct fc_lport *lp) | |
622 | { | |
014f5c3f | 623 | struct fcoe_port *port = lport_priv(lp); |
25024989 CL |
624 | struct fcoe_interface *fcoe = port->fcoe; |
625 | struct fcoe_interface *oldfcoe = NULL; | |
1d1b88dc | 626 | struct net_device *old_real_dev, *cur_real_dev; |
d7179680 VD |
627 | u16 min_xid = FCOE_MIN_XID; |
628 | u16 max_xid = FCOE_MAX_XID; | |
629 | ||
630 | /* | |
631 | * Check if need to allocate an em instance for | |
632 | * offload exchange ids to be shared across all VN_PORTs/lport. | |
633 | */ | |
634 | if (!lp->lro_enabled || !lp->lro_xid || (lp->lro_xid >= max_xid)) { | |
635 | lp->lro_xid = 0; | |
636 | goto skip_oem; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Reuse existing offload em instance in case | |
1d1b88dc | 641 | * it is already allocated on real eth device |
d7179680 | 642 | */ |
25024989 CL |
643 | if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) |
644 | cur_real_dev = vlan_dev_real_dev(fcoe->netdev); | |
1d1b88dc | 645 | else |
25024989 | 646 | cur_real_dev = fcoe->netdev; |
1d1b88dc | 647 | |
25024989 | 648 | list_for_each_entry(oldfcoe, &fcoe_hostlist, list) { |
25024989 CL |
649 | if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN) |
650 | old_real_dev = vlan_dev_real_dev(oldfcoe->netdev); | |
1d1b88dc | 651 | else |
25024989 | 652 | old_real_dev = oldfcoe->netdev; |
1d1b88dc VD |
653 | |
654 | if (cur_real_dev == old_real_dev) { | |
991cbb60 | 655 | fcoe->oem = oldfcoe->oem; |
d7179680 VD |
656 | break; |
657 | } | |
658 | } | |
659 | ||
991cbb60 CL |
660 | if (fcoe->oem) { |
661 | if (!fc_exch_mgr_add(lp, fcoe->oem, fcoe_oem_match)) { | |
d7179680 VD |
662 | printk(KERN_ERR "fcoe_em_config: failed to add " |
663 | "offload em:%p on interface:%s\n", | |
991cbb60 | 664 | fcoe->oem, fcoe->netdev->name); |
d7179680 VD |
665 | return -ENOMEM; |
666 | } | |
667 | } else { | |
991cbb60 | 668 | fcoe->oem = fc_exch_mgr_alloc(lp, FC_CLASS_3, |
d7179680 VD |
669 | FCOE_MIN_XID, lp->lro_xid, |
670 | fcoe_oem_match); | |
991cbb60 | 671 | if (!fcoe->oem) { |
d7179680 VD |
672 | printk(KERN_ERR "fcoe_em_config: failed to allocate " |
673 | "em for offload exches on interface:%s\n", | |
25024989 | 674 | fcoe->netdev->name); |
d7179680 VD |
675 | return -ENOMEM; |
676 | } | |
677 | } | |
678 | ||
679 | /* | |
680 | * Exclude offload EM xid range from next EM xid range. | |
681 | */ | |
682 | min_xid += lp->lro_xid + 1; | |
683 | ||
684 | skip_oem: | |
685 | if (!fc_exch_mgr_alloc(lp, FC_CLASS_3, min_xid, max_xid, NULL)) { | |
686 | printk(KERN_ERR "fcoe_em_config: failed to " | |
25024989 | 687 | "allocate em on interface %s\n", fcoe->netdev->name); |
7f349142 | 688 | return -ENOMEM; |
d7179680 | 689 | } |
7f349142 VD |
690 | |
691 | return 0; | |
692 | } | |
693 | ||
694 | /** | |
695 | * fcoe_if_destroy() - FCoE software HBA tear-down function | |
af7f85d9 | 696 | * @lport: fc_lport to destroy |
7f349142 | 697 | */ |
af7f85d9 | 698 | static void fcoe_if_destroy(struct fc_lport *lport) |
7f349142 | 699 | { |
014f5c3f CL |
700 | struct fcoe_port *port = lport_priv(lport); |
701 | struct fcoe_interface *fcoe = port->fcoe; | |
25024989 | 702 | struct net_device *netdev = fcoe->netdev; |
7f349142 | 703 | |
d5488eb9 | 704 | FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); |
7f349142 | 705 | |
7f349142 | 706 | /* Logout of the fabric */ |
af7f85d9 | 707 | fc_fabric_logoff(lport); |
7f349142 | 708 | |
54b649f8 CL |
709 | /* Cleanup the fc_lport */ |
710 | fc_lport_destroy(lport); | |
711 | fc_fcp_destroy(lport); | |
712 | ||
713 | /* Stop the transmit retry timer */ | |
714 | del_timer_sync(&port->timer); | |
ab6b85c1 | 715 | |
54b649f8 CL |
716 | /* Free existing transmit skbs */ |
717 | fcoe_clean_pending_queue(lport); | |
718 | ||
11b56188 CL |
719 | rtnl_lock(); |
720 | if (!is_zero_ether_addr(port->data_src_addr)) | |
721 | dev_unicast_delete(netdev, port->data_src_addr); | |
722 | rtnl_unlock(); | |
723 | ||
54b649f8 CL |
724 | /* receives may not be stopped until after this */ |
725 | fcoe_interface_put(fcoe); | |
7f349142 | 726 | |
f161fb72 | 727 | /* Free queued packets for the per-CPU receive threads */ |
af7f85d9 | 728 | fcoe_percpu_clean(lport); |
f161fb72 | 729 | |
7f349142 | 730 | /* Detach from the scsi-ml */ |
af7f85d9 CL |
731 | fc_remove_host(lport->host); |
732 | scsi_remove_host(lport->host); | |
7f349142 VD |
733 | |
734 | /* There are no more rports or I/O, free the EM */ | |
af7f85d9 | 735 | fc_exch_mgr_free(lport); |
7f349142 | 736 | |
7f349142 | 737 | /* Free memory used by statistical counters */ |
af7f85d9 | 738 | fc_lport_free_stats(lport); |
7f349142 | 739 | |
2e70e241 | 740 | /* Release the Scsi_Host */ |
af7f85d9 | 741 | scsi_host_put(lport->host); |
7f349142 VD |
742 | } |
743 | ||
744 | /* | |
745 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device | |
746 | * @lp: the corresponding fc_lport | |
747 | * @xid: the exchange id for this ddp transfer | |
748 | * @sgl: the scatterlist describing this transfer | |
749 | * @sgc: number of sg items | |
750 | * | |
751 | * Returns : 0 no ddp | |
752 | */ | |
753 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, | |
754 | struct scatterlist *sgl, unsigned int sgc) | |
755 | { | |
756 | struct net_device *n = fcoe_netdev(lp); | |
757 | ||
b04d023c | 758 | if (n->netdev_ops->ndo_fcoe_ddp_setup) |
7f349142 VD |
759 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
764 | /* | |
765 | * fcoe_ddp_done - calls LLD's ddp_done through net_device | |
766 | * @lp: the corresponding fc_lport | |
767 | * @xid: the exchange id for this ddp transfer | |
768 | * | |
769 | * Returns : the length of data that have been completed by ddp | |
770 | */ | |
771 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) | |
772 | { | |
773 | struct net_device *n = fcoe_netdev(lp); | |
774 | ||
b04d023c | 775 | if (n->netdev_ops->ndo_fcoe_ddp_done) |
7f349142 VD |
776 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); |
777 | return 0; | |
778 | } | |
779 | ||
11b56188 CL |
780 | static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, |
781 | u32 did, struct fc_frame *fp, unsigned int op, | |
782 | void (*resp)(struct fc_seq *, struct fc_frame *, void *), | |
783 | void *arg, u32 timeout); | |
784 | ||
7f349142 VD |
785 | static struct libfc_function_template fcoe_libfc_fcn_templ = { |
786 | .frame_send = fcoe_xmit, | |
787 | .ddp_setup = fcoe_ddp_setup, | |
788 | .ddp_done = fcoe_ddp_done, | |
11b56188 | 789 | .elsct_send = fcoe_elsct_send, |
7f349142 VD |
790 | }; |
791 | ||
792 | /** | |
030f4e00 CL |
793 | * fcoe_if_create() - this function creates the fcoe port |
794 | * @fcoe: fcoe_interface structure to create an fc_lport instance on | |
af7f85d9 | 795 | * @parent: device pointer to be the parent in sysfs for the SCSI host |
9a05753b | 796 | * @npiv: is this a vport? |
7f349142 | 797 | * |
54b649f8 | 798 | * Creates fc_lport struct and scsi_host for lport, configures lport. |
7f349142 | 799 | * |
af7f85d9 | 800 | * Returns : The allocated fc_lport or an error pointer |
7f349142 | 801 | */ |
030f4e00 | 802 | static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe, |
9a05753b | 803 | struct device *parent, int npiv) |
7f349142 VD |
804 | { |
805 | int rc; | |
af7f85d9 | 806 | struct fc_lport *lport = NULL; |
014f5c3f | 807 | struct fcoe_port *port; |
7f349142 | 808 | struct Scsi_Host *shost; |
030f4e00 | 809 | struct net_device *netdev = fcoe->netdev; |
9a05753b CL |
810 | /* |
811 | * parent is only a vport if npiv is 1, | |
812 | * but we'll only use vport in that case so go ahead and set it | |
813 | */ | |
814 | struct fc_vport *vport = dev_to_vport(parent); | |
7f349142 | 815 | |
d5488eb9 | 816 | FCOE_NETDEV_DBG(netdev, "Create Interface\n"); |
7f349142 | 817 | |
9a05753b CL |
818 | if (!npiv) { |
819 | lport = libfc_host_alloc(&fcoe_shost_template, | |
820 | sizeof(struct fcoe_port)); | |
821 | } else { | |
822 | lport = libfc_vport_create(vport, | |
823 | sizeof(struct fcoe_port)); | |
824 | } | |
86221969 | 825 | if (!lport) { |
d5488eb9 | 826 | FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); |
af7f85d9 | 827 | rc = -ENOMEM; |
030f4e00 | 828 | goto out; |
7f349142 | 829 | } |
86221969 | 830 | shost = lport->host; |
014f5c3f | 831 | port = lport_priv(lport); |
2e70e241 | 832 | port->lport = lport; |
014f5c3f | 833 | port->fcoe = fcoe; |
2e70e241 | 834 | INIT_WORK(&port->destroy_work, fcoe_destroy_work); |
7f349142 VD |
835 | |
836 | /* configure fc_lport, e.g., em */ | |
af7f85d9 | 837 | rc = fcoe_lport_config(lport); |
7f349142 | 838 | if (rc) { |
d5488eb9 RL |
839 | FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " |
840 | "interface\n"); | |
7f349142 VD |
841 | goto out_host_put; |
842 | } | |
843 | ||
9a05753b CL |
844 | if (npiv) { |
845 | FCOE_NETDEV_DBG(netdev, "Setting vport names, 0x%llX 0x%llX\n", | |
846 | vport->node_name, vport->port_name); | |
847 | fc_set_wwnn(lport, vport->node_name); | |
848 | fc_set_wwpn(lport, vport->port_name); | |
849 | } | |
850 | ||
ab6b85c1 | 851 | /* configure lport network properties */ |
af7f85d9 | 852 | rc = fcoe_netdev_config(lport, netdev); |
ab6b85c1 | 853 | if (rc) { |
d5488eb9 RL |
854 | FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " |
855 | "interface\n"); | |
54b649f8 | 856 | goto out_lp_destroy; |
ab6b85c1 | 857 | } |
97c8389d | 858 | |
7f349142 | 859 | /* configure lport scsi host properties */ |
af7f85d9 | 860 | rc = fcoe_shost_config(lport, shost, parent); |
7f349142 | 861 | if (rc) { |
d5488eb9 RL |
862 | FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " |
863 | "interface\n"); | |
54b649f8 | 864 | goto out_lp_destroy; |
7f349142 VD |
865 | } |
866 | ||
96316099 | 867 | /* Initialize the library */ |
af7f85d9 | 868 | rc = fcoe_libfc_config(lport, &fcoe_libfc_fcn_templ); |
7f349142 | 869 | if (rc) { |
96316099 | 870 | FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " |
d5488eb9 | 871 | "interface\n"); |
96316099 | 872 | goto out_lp_destroy; |
7f349142 VD |
873 | } |
874 | ||
9a05753b CL |
875 | if (!npiv) { |
876 | /* | |
877 | * fcoe_em_alloc() and fcoe_hostlist_add() both | |
878 | * need to be atomic with respect to other changes to the | |
879 | * hostlist since fcoe_em_alloc() looks for an existing EM | |
880 | * instance on host list updated by fcoe_hostlist_add(). | |
881 | * | |
882 | * This is currently handled through the fcoe_config_mutex | |
883 | * begin held. | |
884 | */ | |
c863df33 | 885 | |
9a05753b CL |
886 | /* lport exch manager allocation */ |
887 | rc = fcoe_em_config(lport); | |
888 | if (rc) { | |
889 | FCOE_NETDEV_DBG(netdev, "Could not configure the EM " | |
890 | "for the interface\n"); | |
891 | goto out_lp_destroy; | |
892 | } | |
7f349142 VD |
893 | } |
894 | ||
030f4e00 | 895 | fcoe_interface_get(fcoe); |
af7f85d9 | 896 | return lport; |
7f349142 VD |
897 | |
898 | out_lp_destroy: | |
af7f85d9 | 899 | fc_exch_mgr_free(lport); |
7f349142 | 900 | out_host_put: |
af7f85d9 CL |
901 | scsi_host_put(lport->host); |
902 | out: | |
903 | return ERR_PTR(rc); | |
7f349142 VD |
904 | } |
905 | ||
906 | /** | |
907 | * fcoe_if_init() - attach to scsi transport | |
908 | * | |
909 | * Returns : 0 on success | |
910 | */ | |
911 | static int __init fcoe_if_init(void) | |
912 | { | |
913 | /* attach to scsi transport */ | |
e9084bb8 CL |
914 | fcoe_transport_template = fc_attach_transport(&fcoe_transport_function); |
915 | fcoe_vport_transport_template = | |
916 | fc_attach_transport(&fcoe_vport_transport_function); | |
7f349142 | 917 | |
e9084bb8 | 918 | if (!fcoe_transport_template) { |
d5488eb9 | 919 | printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); |
7f349142 VD |
920 | return -ENODEV; |
921 | } | |
922 | ||
923 | return 0; | |
924 | } | |
925 | ||
926 | /** | |
927 | * fcoe_if_exit() - detach from scsi transport | |
928 | * | |
929 | * Returns : 0 on success | |
930 | */ | |
931 | int __exit fcoe_if_exit(void) | |
932 | { | |
e9084bb8 CL |
933 | fc_release_transport(fcoe_transport_template); |
934 | fc_release_transport(fcoe_vport_transport_template); | |
935 | fcoe_transport_template = NULL; | |
936 | fcoe_vport_transport_template = NULL; | |
7f349142 VD |
937 | return 0; |
938 | } | |
939 | ||
8976f424 RL |
940 | /** |
941 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu | |
942 | * @cpu: cpu index for the online cpu | |
943 | */ | |
944 | static void fcoe_percpu_thread_create(unsigned int cpu) | |
945 | { | |
946 | struct fcoe_percpu_s *p; | |
947 | struct task_struct *thread; | |
948 | ||
949 | p = &per_cpu(fcoe_percpu, cpu); | |
950 | ||
951 | thread = kthread_create(fcoe_percpu_receive_thread, | |
952 | (void *)p, "fcoethread/%d", cpu); | |
953 | ||
e7a51997 | 954 | if (likely(!IS_ERR(thread))) { |
8976f424 RL |
955 | kthread_bind(thread, cpu); |
956 | wake_up_process(thread); | |
957 | ||
958 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
959 | p->thread = thread; | |
960 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
961 | } | |
962 | } | |
963 | ||
964 | /** | |
965 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu | |
966 | * @cpu: cpu index the rx thread is to be removed | |
967 | * | |
968 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the | |
969 | * current CPU's Rx thread. If the thread being destroyed is bound to | |
970 | * the CPU processing this context the skbs will be freed. | |
971 | */ | |
972 | static void fcoe_percpu_thread_destroy(unsigned int cpu) | |
973 | { | |
974 | struct fcoe_percpu_s *p; | |
975 | struct task_struct *thread; | |
976 | struct page *crc_eof; | |
977 | struct sk_buff *skb; | |
978 | #ifdef CONFIG_SMP | |
979 | struct fcoe_percpu_s *p0; | |
980 | unsigned targ_cpu = smp_processor_id(); | |
981 | #endif /* CONFIG_SMP */ | |
982 | ||
d5488eb9 | 983 | FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); |
8976f424 RL |
984 | |
985 | /* Prevent any new skbs from being queued for this CPU. */ | |
986 | p = &per_cpu(fcoe_percpu, cpu); | |
987 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
988 | thread = p->thread; | |
989 | p->thread = NULL; | |
990 | crc_eof = p->crc_eof_page; | |
991 | p->crc_eof_page = NULL; | |
992 | p->crc_eof_offset = 0; | |
993 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
994 | ||
995 | #ifdef CONFIG_SMP | |
996 | /* | |
997 | * Don't bother moving the skb's if this context is running | |
998 | * on the same CPU that is having its thread destroyed. This | |
999 | * can easily happen when the module is removed. | |
1000 | */ | |
1001 | if (cpu != targ_cpu) { | |
1002 | p0 = &per_cpu(fcoe_percpu, targ_cpu); | |
1003 | spin_lock_bh(&p0->fcoe_rx_list.lock); | |
1004 | if (p0->thread) { | |
d5488eb9 RL |
1005 | FCOE_DBG("Moving frames from CPU %d to CPU %d\n", |
1006 | cpu, targ_cpu); | |
8976f424 RL |
1007 | |
1008 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
1009 | __skb_queue_tail(&p0->fcoe_rx_list, skb); | |
1010 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
1011 | } else { | |
1012 | /* | |
1013 | * The targeted CPU is not initialized and cannot accept | |
1014 | * new skbs. Unlock the targeted CPU and drop the skbs | |
1015 | * on the CPU that is going offline. | |
1016 | */ | |
1017 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
1018 | kfree_skb(skb); | |
1019 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
1020 | } | |
1021 | } else { | |
1022 | /* | |
1023 | * This scenario occurs when the module is being removed | |
1024 | * and all threads are being destroyed. skbs will continue | |
1025 | * to be shifted from the CPU thread that is being removed | |
1026 | * to the CPU thread associated with the CPU that is processing | |
1027 | * the module removal. Once there is only one CPU Rx thread it | |
1028 | * will reach this case and we will drop all skbs and later | |
1029 | * stop the thread. | |
1030 | */ | |
1031 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1032 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
1033 | kfree_skb(skb); | |
1034 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1035 | } | |
1036 | #else | |
1037 | /* | |
dd3fd72e | 1038 | * This a non-SMP scenario where the singular Rx thread is |
8976f424 RL |
1039 | * being removed. Free all skbs and stop the thread. |
1040 | */ | |
1041 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1042 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
1043 | kfree_skb(skb); | |
1044 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1045 | #endif | |
1046 | ||
1047 | if (thread) | |
1048 | kthread_stop(thread); | |
1049 | ||
1050 | if (crc_eof) | |
1051 | put_page(crc_eof); | |
1052 | } | |
1053 | ||
1054 | /** | |
1055 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback | |
1056 | * @nfb: callback data block | |
1057 | * @action: event triggering the callback | |
1058 | * @hcpu: index for the cpu of this event | |
1059 | * | |
1060 | * This creates or destroys per cpu data for fcoe | |
1061 | * | |
1062 | * Returns NOTIFY_OK always. | |
1063 | */ | |
1064 | static int fcoe_cpu_callback(struct notifier_block *nfb, | |
1065 | unsigned long action, void *hcpu) | |
1066 | { | |
1067 | unsigned cpu = (unsigned long)hcpu; | |
1068 | ||
1069 | switch (action) { | |
1070 | case CPU_ONLINE: | |
1071 | case CPU_ONLINE_FROZEN: | |
d5488eb9 | 1072 | FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); |
8976f424 RL |
1073 | fcoe_percpu_thread_create(cpu); |
1074 | break; | |
1075 | case CPU_DEAD: | |
1076 | case CPU_DEAD_FROZEN: | |
d5488eb9 | 1077 | FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); |
8976f424 RL |
1078 | fcoe_percpu_thread_destroy(cpu); |
1079 | break; | |
1080 | default: | |
1081 | break; | |
1082 | } | |
1083 | return NOTIFY_OK; | |
1084 | } | |
1085 | ||
1086 | static struct notifier_block fcoe_cpu_notifier = { | |
1087 | .notifier_call = fcoe_cpu_callback, | |
1088 | }; | |
1089 | ||
85b4aa49 | 1090 | /** |
34f42a07 | 1091 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
1092 | * @skb: the receive skb |
1093 | * @dev: associated net device | |
1094 | * @ptype: context | |
dd3fd72e | 1095 | * @olddev: last device |
85b4aa49 RL |
1096 | * |
1097 | * this function will receive the packet and build fc frame and pass it up | |
1098 | * | |
1099 | * Returns: 0 for success | |
34f42a07 | 1100 | */ |
85b4aa49 RL |
1101 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
1102 | struct packet_type *ptype, struct net_device *olddev) | |
1103 | { | |
1104 | struct fc_lport *lp; | |
1105 | struct fcoe_rcv_info *fr; | |
259ad85d | 1106 | struct fcoe_interface *fcoe; |
85b4aa49 | 1107 | struct fc_frame_header *fh; |
85b4aa49 | 1108 | struct fcoe_percpu_s *fps; |
b2f0091f | 1109 | unsigned int cpu; |
85b4aa49 | 1110 | |
259ad85d | 1111 | fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type); |
3fe9a0ba | 1112 | lp = fcoe->ctlr.lp; |
85b4aa49 | 1113 | if (unlikely(lp == NULL)) { |
d5488eb9 | 1114 | FCOE_NETDEV_DBG(dev, "Cannot find hba structure"); |
85b4aa49 RL |
1115 | goto err2; |
1116 | } | |
97c8389d JE |
1117 | if (!lp->link_up) |
1118 | goto err2; | |
85b4aa49 | 1119 | |
d5488eb9 RL |
1120 | FCOE_NETDEV_DBG(dev, "skb_info: len:%d data_len:%d head:%p " |
1121 | "data:%p tail:%p end:%p sum:%d dev:%s", | |
1122 | skb->len, skb->data_len, skb->head, skb->data, | |
1123 | skb_tail_pointer(skb), skb_end_pointer(skb), | |
1124 | skb->csum, skb->dev ? skb->dev->name : "<NULL>"); | |
85b4aa49 RL |
1125 | |
1126 | /* check for FCOE packet type */ | |
1127 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
d5488eb9 | 1128 | FCOE_NETDEV_DBG(dev, "Wrong FC type frame"); |
85b4aa49 RL |
1129 | goto err; |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * Check for minimum frame length, and make sure required FCoE | |
1134 | * and FC headers are pulled into the linear data area. | |
1135 | */ | |
1136 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
1137 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
1138 | goto err; | |
1139 | ||
1140 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
1141 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1142 | ||
85b4aa49 RL |
1143 | fr = fcoe_dev_from_skb(skb); |
1144 | fr->fr_dev = lp; | |
1145 | fr->ptype = ptype; | |
5e5e92df | 1146 | |
85b4aa49 | 1147 | /* |
b2f0091f VD |
1148 | * In case the incoming frame's exchange is originated from |
1149 | * the initiator, then received frame's exchange id is ANDed | |
1150 | * with fc_cpu_mask bits to get the same cpu on which exchange | |
1151 | * was originated, otherwise just use the current cpu. | |
85b4aa49 | 1152 | */ |
b2f0091f VD |
1153 | if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) |
1154 | cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; | |
1155 | else | |
1156 | cpu = smp_processor_id(); | |
5e5e92df | 1157 | |
8976f424 | 1158 | fps = &per_cpu(fcoe_percpu, cpu); |
85b4aa49 | 1159 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
8976f424 RL |
1160 | if (unlikely(!fps->thread)) { |
1161 | /* | |
1162 | * The targeted CPU is not ready, let's target | |
1163 | * the first CPU now. For non-SMP systems this | |
1164 | * will check the same CPU twice. | |
1165 | */ | |
d5488eb9 RL |
1166 | FCOE_NETDEV_DBG(dev, "CPU is online, but no receive thread " |
1167 | "ready for incoming skb- using first online " | |
1168 | "CPU.\n"); | |
8976f424 RL |
1169 | |
1170 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
1171 | cpu = first_cpu(cpu_online_map); | |
1172 | fps = &per_cpu(fcoe_percpu, cpu); | |
1173 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
1174 | if (!fps->thread) { | |
1175 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
1176 | goto err; | |
1177 | } | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * We now have a valid CPU that we're targeting for | |
1182 | * this skb. We also have this receive thread locked, | |
1183 | * so we're free to queue skbs into it's queue. | |
1184 | */ | |
85b4aa49 RL |
1185 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
1186 | if (fps->fcoe_rx_list.qlen == 1) | |
1187 | wake_up_process(fps->thread); | |
1188 | ||
1189 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
1190 | ||
1191 | return 0; | |
1192 | err: | |
582b45bc | 1193 | fc_lport_get_stats(lp)->ErrorFrames++; |
85b4aa49 RL |
1194 | |
1195 | err2: | |
1196 | kfree_skb(skb); | |
1197 | return -1; | |
1198 | } | |
85b4aa49 RL |
1199 | |
1200 | /** | |
34f42a07 | 1201 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
1202 | * @skb: the skb to be xmitted |
1203 | * | |
1204 | * Returns: 0 for success | |
34f42a07 | 1205 | */ |
85b4aa49 RL |
1206 | static inline int fcoe_start_io(struct sk_buff *skb) |
1207 | { | |
1208 | int rc; | |
1209 | ||
1210 | skb_get(skb); | |
1211 | rc = dev_queue_xmit(skb); | |
1212 | if (rc != 0) | |
1213 | return rc; | |
1214 | kfree_skb(skb); | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | /** | |
dd3fd72e | 1219 | * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof |
85b4aa49 RL |
1220 | * @skb: the skb to be xmitted |
1221 | * @tlen: total len | |
1222 | * | |
1223 | * Returns: 0 for success | |
34f42a07 | 1224 | */ |
85b4aa49 RL |
1225 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
1226 | { | |
1227 | struct fcoe_percpu_s *fps; | |
1228 | struct page *page; | |
85b4aa49 | 1229 | |
5e5e92df | 1230 | fps = &get_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1231 | page = fps->crc_eof_page; |
1232 | if (!page) { | |
1233 | page = alloc_page(GFP_ATOMIC); | |
1234 | if (!page) { | |
5e5e92df | 1235 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1236 | return -ENOMEM; |
1237 | } | |
1238 | fps->crc_eof_page = page; | |
8976f424 | 1239 | fps->crc_eof_offset = 0; |
85b4aa49 RL |
1240 | } |
1241 | ||
1242 | get_page(page); | |
1243 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
1244 | fps->crc_eof_offset, tlen); | |
1245 | skb->len += tlen; | |
1246 | skb->data_len += tlen; | |
1247 | skb->truesize += tlen; | |
1248 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
1249 | ||
1250 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
1251 | fps->crc_eof_page = NULL; | |
1252 | fps->crc_eof_offset = 0; | |
1253 | put_page(page); | |
1254 | } | |
5e5e92df | 1255 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1256 | return 0; |
1257 | } | |
1258 | ||
1259 | /** | |
34f42a07 | 1260 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
dd3fd72e | 1261 | * @fp: the fc_frame containing data to be checksummed |
85b4aa49 | 1262 | * |
014f5c3f | 1263 | * This uses crc32() to calculate the crc for port frame |
85b4aa49 | 1264 | * Return : 32 bit crc |
34f42a07 | 1265 | */ |
85b4aa49 RL |
1266 | u32 fcoe_fc_crc(struct fc_frame *fp) |
1267 | { | |
1268 | struct sk_buff *skb = fp_skb(fp); | |
1269 | struct skb_frag_struct *frag; | |
1270 | unsigned char *data; | |
1271 | unsigned long off, len, clen; | |
1272 | u32 crc; | |
1273 | unsigned i; | |
1274 | ||
1275 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
1276 | ||
1277 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1278 | frag = &skb_shinfo(skb)->frags[i]; | |
1279 | off = frag->page_offset; | |
1280 | len = frag->size; | |
1281 | while (len > 0) { | |
1282 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
1283 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
1284 | KM_SKB_DATA_SOFTIRQ); | |
1285 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
1286 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
1287 | off += clen; | |
1288 | len -= clen; | |
1289 | } | |
1290 | } | |
1291 | return crc; | |
1292 | } | |
85b4aa49 RL |
1293 | |
1294 | /** | |
34f42a07 | 1295 | * fcoe_xmit() - FCoE frame transmit function |
014f5c3f | 1296 | * @lp: the associated local fcoe |
85b4aa49 RL |
1297 | * @fp: the fc_frame to be transmitted |
1298 | * | |
1299 | * Return : 0 for success | |
34f42a07 | 1300 | */ |
85b4aa49 RL |
1301 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
1302 | { | |
4bb6b515 | 1303 | int wlen; |
85b4aa49 RL |
1304 | u32 crc; |
1305 | struct ethhdr *eh; | |
1306 | struct fcoe_crc_eof *cp; | |
1307 | struct sk_buff *skb; | |
1308 | struct fcoe_dev_stats *stats; | |
1309 | struct fc_frame_header *fh; | |
1310 | unsigned int hlen; /* header length implies the version */ | |
1311 | unsigned int tlen; /* trailer length */ | |
1312 | unsigned int elen; /* eth header, may include vlan */ | |
3fe9a0ba CL |
1313 | struct fcoe_port *port = lport_priv(lp); |
1314 | struct fcoe_interface *fcoe = port->fcoe; | |
85b4aa49 RL |
1315 | u8 sof, eof; |
1316 | struct fcoe_hdr *hp; | |
1317 | ||
1318 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
1319 | ||
85b4aa49 | 1320 | fh = fc_frame_header_get(fp); |
97c8389d JE |
1321 | skb = fp_skb(fp); |
1322 | wlen = skb->len / FCOE_WORD_TO_BYTE; | |
1323 | ||
1324 | if (!lp->link_up) { | |
3caf02ee | 1325 | kfree_skb(skb); |
97c8389d | 1326 | return 0; |
85b4aa49 RL |
1327 | } |
1328 | ||
97c8389d | 1329 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) && |
11b56188 | 1330 | fcoe_ctlr_els_send(&fcoe->ctlr, lp, skb)) |
97c8389d JE |
1331 | return 0; |
1332 | ||
85b4aa49 RL |
1333 | sof = fr_sof(fp); |
1334 | eof = fr_eof(fp); | |
1335 | ||
4e57e1cb | 1336 | elen = sizeof(struct ethhdr); |
85b4aa49 RL |
1337 | hlen = sizeof(struct fcoe_hdr); |
1338 | tlen = sizeof(struct fcoe_crc_eof); | |
1339 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
1340 | ||
1341 | /* crc offload */ | |
1342 | if (likely(lp->crc_offload)) { | |
39ca9a06 | 1343 | skb->ip_summed = CHECKSUM_PARTIAL; |
85b4aa49 RL |
1344 | skb->csum_start = skb_headroom(skb); |
1345 | skb->csum_offset = skb->len; | |
1346 | crc = 0; | |
1347 | } else { | |
1348 | skb->ip_summed = CHECKSUM_NONE; | |
1349 | crc = fcoe_fc_crc(fp); | |
1350 | } | |
1351 | ||
014f5c3f | 1352 | /* copy port crc and eof to the skb buff */ |
85b4aa49 RL |
1353 | if (skb_is_nonlinear(skb)) { |
1354 | skb_frag_t *frag; | |
1355 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 1356 | kfree_skb(skb); |
85b4aa49 RL |
1357 | return -ENOMEM; |
1358 | } | |
1359 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
1360 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
1361 | + frag->page_offset; | |
1362 | } else { | |
1363 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
1364 | } | |
1365 | ||
1366 | memset(cp, 0, sizeof(*cp)); | |
1367 | cp->fcoe_eof = eof; | |
1368 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
1369 | ||
1370 | if (skb_is_nonlinear(skb)) { | |
1371 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
1372 | cp = NULL; | |
1373 | } | |
1374 | ||
014f5c3f | 1375 | /* adjust skb network/transport offsets to match mac/fcoe/port */ |
85b4aa49 RL |
1376 | skb_push(skb, elen + hlen); |
1377 | skb_reset_mac_header(skb); | |
1378 | skb_reset_network_header(skb); | |
1379 | skb->mac_len = elen; | |
211c738d | 1380 | skb->protocol = htons(ETH_P_FCOE); |
3fe9a0ba | 1381 | skb->dev = fcoe->netdev; |
85b4aa49 RL |
1382 | |
1383 | /* fill up mac and fcoe headers */ | |
1384 | eh = eth_hdr(skb); | |
1385 | eh->h_proto = htons(ETH_P_FCOE); | |
3fe9a0ba | 1386 | if (fcoe->ctlr.map_dest) |
85b4aa49 RL |
1387 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); |
1388 | else | |
1389 | /* insert GW address */ | |
3fe9a0ba | 1390 | memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN); |
85b4aa49 | 1391 | |
3fe9a0ba CL |
1392 | if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
1393 | memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN); | |
85b4aa49 | 1394 | else |
11b56188 | 1395 | memcpy(eh->h_source, port->data_src_addr, ETH_ALEN); |
85b4aa49 RL |
1396 | |
1397 | hp = (struct fcoe_hdr *)(eh + 1); | |
1398 | memset(hp, 0, sizeof(*hp)); | |
1399 | if (FC_FCOE_VER) | |
1400 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
1401 | hp->fcoe_sof = sof; | |
1402 | ||
39ca9a06 YZ |
1403 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ |
1404 | if (lp->seq_offload && fr_max_payload(fp)) { | |
1405 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; | |
1406 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); | |
1407 | } else { | |
1408 | skb_shinfo(skb)->gso_type = 0; | |
1409 | skb_shinfo(skb)->gso_size = 0; | |
1410 | } | |
85b4aa49 | 1411 | /* update tx stats: regardless if LLD fails */ |
582b45bc RL |
1412 | stats = fc_lport_get_stats(lp); |
1413 | stats->TxFrames++; | |
1414 | stats->TxWords += wlen; | |
85b4aa49 RL |
1415 | |
1416 | /* send down to lld */ | |
1417 | fr_dev(fp) = lp; | |
014f5c3f | 1418 | if (port->fcoe_pending_queue.qlen) |
4bb6b515 VD |
1419 | fcoe_check_wait_queue(lp, skb); |
1420 | else if (fcoe_start_io(skb)) | |
1421 | fcoe_check_wait_queue(lp, skb); | |
85b4aa49 RL |
1422 | |
1423 | return 0; | |
1424 | } | |
85b4aa49 | 1425 | |
e7a51997 JE |
1426 | /** |
1427 | * fcoe_percpu_flush_done() - Indicate percpu queue flush completion. | |
1428 | * @skb: the skb being completed. | |
1429 | */ | |
1430 | static void fcoe_percpu_flush_done(struct sk_buff *skb) | |
1431 | { | |
1432 | complete(&fcoe_flush_completion); | |
1433 | } | |
1434 | ||
34f42a07 RL |
1435 | /** |
1436 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
1437 | * @arg: ptr to the fcoe per cpu struct |
1438 | * | |
1439 | * Return: 0 for success | |
85b4aa49 RL |
1440 | */ |
1441 | int fcoe_percpu_receive_thread(void *arg) | |
1442 | { | |
1443 | struct fcoe_percpu_s *p = arg; | |
1444 | u32 fr_len; | |
1445 | struct fc_lport *lp; | |
1446 | struct fcoe_rcv_info *fr; | |
1447 | struct fcoe_dev_stats *stats; | |
1448 | struct fc_frame_header *fh; | |
1449 | struct sk_buff *skb; | |
1450 | struct fcoe_crc_eof crc_eof; | |
1451 | struct fc_frame *fp; | |
1452 | u8 *mac = NULL; | |
014f5c3f | 1453 | struct fcoe_port *port; |
85b4aa49 RL |
1454 | struct fcoe_hdr *hp; |
1455 | ||
4469c195 | 1456 | set_user_nice(current, -20); |
85b4aa49 RL |
1457 | |
1458 | while (!kthread_should_stop()) { | |
1459 | ||
1460 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1461 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
1462 | set_current_state(TASK_INTERRUPTIBLE); | |
1463 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1464 | schedule(); | |
1465 | set_current_state(TASK_RUNNING); | |
1466 | if (kthread_should_stop()) | |
1467 | return 0; | |
1468 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1469 | } | |
1470 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1471 | fr = fcoe_dev_from_skb(skb); | |
1472 | lp = fr->fr_dev; | |
1473 | if (unlikely(lp == NULL)) { | |
e7a51997 JE |
1474 | if (skb->destructor != fcoe_percpu_flush_done) |
1475 | FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb"); | |
85b4aa49 RL |
1476 | kfree_skb(skb); |
1477 | continue; | |
1478 | } | |
1479 | ||
d5488eb9 RL |
1480 | FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d " |
1481 | "head:%p data:%p tail:%p end:%p sum:%d dev:%s", | |
1482 | skb->len, skb->data_len, | |
1483 | skb->head, skb->data, skb_tail_pointer(skb), | |
1484 | skb_end_pointer(skb), skb->csum, | |
1485 | skb->dev ? skb->dev->name : "<NULL>"); | |
85b4aa49 RL |
1486 | |
1487 | /* | |
1488 | * Save source MAC address before discarding header. | |
1489 | */ | |
014f5c3f | 1490 | port = lport_priv(lp); |
85b4aa49 RL |
1491 | if (skb_is_nonlinear(skb)) |
1492 | skb_linearize(skb); /* not ideal */ | |
97c8389d | 1493 | mac = eth_hdr(skb)->h_source; |
85b4aa49 RL |
1494 | |
1495 | /* | |
1496 | * Frame length checks and setting up the header pointers | |
1497 | * was done in fcoe_rcv already. | |
1498 | */ | |
1499 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
1500 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1501 | ||
582b45bc | 1502 | stats = fc_lport_get_stats(lp); |
85b4aa49 | 1503 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
582b45bc | 1504 | if (stats->ErrorFrames < 5) |
d5488eb9 | 1505 | printk(KERN_WARNING "fcoe: FCoE version " |
582b45bc RL |
1506 | "mismatch: The frame has " |
1507 | "version %x, but the " | |
1508 | "initiator supports version " | |
1509 | "%x\n", FC_FCOE_DECAPS_VER(hp), | |
1510 | FC_FCOE_VER); | |
1511 | stats->ErrorFrames++; | |
85b4aa49 RL |
1512 | kfree_skb(skb); |
1513 | continue; | |
1514 | } | |
1515 | ||
1516 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
1517 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
1518 | ||
582b45bc RL |
1519 | stats->RxFrames++; |
1520 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
85b4aa49 RL |
1521 | |
1522 | fp = (struct fc_frame *)skb; | |
1523 | fc_frame_init(fp); | |
1524 | fr_dev(fp) = lp; | |
1525 | fr_sof(fp) = hp->fcoe_sof; | |
1526 | ||
1527 | /* Copy out the CRC and EOF trailer for access */ | |
1528 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
1529 | kfree_skb(skb); | |
1530 | continue; | |
1531 | } | |
1532 | fr_eof(fp) = crc_eof.fcoe_eof; | |
1533 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
1534 | if (pskb_trim(skb, fr_len)) { | |
1535 | kfree_skb(skb); | |
1536 | continue; | |
1537 | } | |
1538 | ||
1539 | /* | |
1540 | * We only check CRC if no offload is available and if it is | |
1541 | * it's solicited data, in which case, the FCP layer would | |
1542 | * check it during the copy. | |
1543 | */ | |
07c00ec4 | 1544 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
85b4aa49 RL |
1545 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
1546 | else | |
1547 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
1548 | ||
1549 | fh = fc_frame_header_get(fp); | |
1550 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
1551 | fh->fh_type == FC_TYPE_FCP) { | |
52ff878c | 1552 | fc_exch_recv(lp, fp); |
85b4aa49 RL |
1553 | continue; |
1554 | } | |
1555 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
1556 | if (le32_to_cpu(fr_crc(fp)) != | |
1557 | ~crc32(~0, skb->data, fr_len)) { | |
d5488eb9 | 1558 | if (stats->InvalidCRCCount < 5) |
85b4aa49 RL |
1559 | printk(KERN_WARNING "fcoe: dropping " |
1560 | "frame with CRC error\n"); | |
1561 | stats->InvalidCRCCount++; | |
1562 | stats->ErrorFrames++; | |
1563 | fc_frame_free(fp); | |
1564 | continue; | |
1565 | } | |
1566 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
1567 | } | |
52ff878c | 1568 | fc_exch_recv(lp, fp); |
85b4aa49 RL |
1569 | } |
1570 | return 0; | |
1571 | } | |
1572 | ||
85b4aa49 | 1573 | /** |
dd3fd72e CL |
1574 | * fcoe_check_wait_queue() - attempt to clear the transmit backlog |
1575 | * @lp: the fc_lport | |
85b4aa49 RL |
1576 | * |
1577 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
1578 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 | 1579 | * transmitted, return qlen or -1 if a error occurs, then restore |
dd3fd72e | 1580 | * wait_queue and try again later. |
85b4aa49 RL |
1581 | * |
1582 | * The wait_queue is used when the skb transmit fails. skb will go | |
dd3fd72e | 1583 | * in the wait_queue which will be emptied by the timer function or |
85b4aa49 | 1584 | * by the next skb transmit. |
34f42a07 | 1585 | */ |
4bb6b515 | 1586 | static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb) |
85b4aa49 | 1587 | { |
014f5c3f | 1588 | struct fcoe_port *port = lport_priv(lp); |
4bb6b515 | 1589 | int rc; |
85b4aa49 | 1590 | |
014f5c3f | 1591 | spin_lock_bh(&port->fcoe_pending_queue.lock); |
4bb6b515 VD |
1592 | |
1593 | if (skb) | |
014f5c3f | 1594 | __skb_queue_tail(&port->fcoe_pending_queue, skb); |
4bb6b515 | 1595 | |
014f5c3f | 1596 | if (port->fcoe_pending_queue_active) |
c826a314 | 1597 | goto out; |
014f5c3f | 1598 | port->fcoe_pending_queue_active = 1; |
55c8bafb | 1599 | |
014f5c3f | 1600 | while (port->fcoe_pending_queue.qlen) { |
55c8bafb | 1601 | /* keep qlen > 0 until fcoe_start_io succeeds */ |
014f5c3f CL |
1602 | port->fcoe_pending_queue.qlen++; |
1603 | skb = __skb_dequeue(&port->fcoe_pending_queue); | |
55c8bafb | 1604 | |
014f5c3f | 1605 | spin_unlock_bh(&port->fcoe_pending_queue.lock); |
55c8bafb | 1606 | rc = fcoe_start_io(skb); |
014f5c3f | 1607 | spin_lock_bh(&port->fcoe_pending_queue.lock); |
55c8bafb CL |
1608 | |
1609 | if (rc) { | |
014f5c3f | 1610 | __skb_queue_head(&port->fcoe_pending_queue, skb); |
55c8bafb | 1611 | /* undo temporary increment above */ |
014f5c3f | 1612 | port->fcoe_pending_queue.qlen--; |
55c8bafb | 1613 | break; |
85b4aa49 | 1614 | } |
55c8bafb | 1615 | /* undo temporary increment above */ |
014f5c3f | 1616 | port->fcoe_pending_queue.qlen--; |
85b4aa49 | 1617 | } |
55c8bafb | 1618 | |
014f5c3f | 1619 | if (port->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) |
55c8bafb | 1620 | lp->qfull = 0; |
014f5c3f CL |
1621 | if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer)) |
1622 | mod_timer(&port->timer, jiffies + 2); | |
1623 | port->fcoe_pending_queue_active = 0; | |
c826a314 | 1624 | out: |
014f5c3f | 1625 | if (port->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
4bb6b515 | 1626 | lp->qfull = 1; |
014f5c3f | 1627 | spin_unlock_bh(&port->fcoe_pending_queue.lock); |
4bb6b515 | 1628 | return; |
85b4aa49 RL |
1629 | } |
1630 | ||
85b4aa49 | 1631 | /** |
34f42a07 RL |
1632 | * fcoe_dev_setup() - setup link change notification interface |
1633 | */ | |
b0d428ad | 1634 | static void fcoe_dev_setup(void) |
85b4aa49 | 1635 | { |
85b4aa49 RL |
1636 | register_netdevice_notifier(&fcoe_notifier); |
1637 | } | |
1638 | ||
1639 | /** | |
b0d428ad | 1640 | * fcoe_dev_cleanup() - cleanup link change notification interface |
34f42a07 | 1641 | */ |
85b4aa49 RL |
1642 | static void fcoe_dev_cleanup(void) |
1643 | { | |
1644 | unregister_netdevice_notifier(&fcoe_notifier); | |
1645 | } | |
1646 | ||
1647 | /** | |
34f42a07 | 1648 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
1649 | * @notifier: context of the notification |
1650 | * @event: type of event | |
1651 | * @ptr: fixed array for output parsed ifname | |
1652 | * | |
1653 | * This function is called by the ethernet driver in case of link change event | |
1654 | * | |
1655 | * Returns: 0 for success | |
34f42a07 | 1656 | */ |
85b4aa49 RL |
1657 | static int fcoe_device_notification(struct notifier_block *notifier, |
1658 | ulong event, void *ptr) | |
1659 | { | |
1660 | struct fc_lport *lp = NULL; | |
1d1b88dc | 1661 | struct net_device *netdev = ptr; |
014f5c3f | 1662 | struct fcoe_interface *fcoe; |
2e70e241 | 1663 | struct fcoe_port *port; |
85b4aa49 | 1664 | struct fcoe_dev_stats *stats; |
97c8389d | 1665 | u32 link_possible = 1; |
85b4aa49 RL |
1666 | u32 mfs; |
1667 | int rc = NOTIFY_OK; | |
1668 | ||
014f5c3f | 1669 | list_for_each_entry(fcoe, &fcoe_hostlist, list) { |
25024989 | 1670 | if (fcoe->netdev == netdev) { |
3fe9a0ba | 1671 | lp = fcoe->ctlr.lp; |
85b4aa49 RL |
1672 | break; |
1673 | } | |
1674 | } | |
85b4aa49 RL |
1675 | if (lp == NULL) { |
1676 | rc = NOTIFY_DONE; | |
1677 | goto out; | |
1678 | } | |
1679 | ||
85b4aa49 RL |
1680 | switch (event) { |
1681 | case NETDEV_DOWN: | |
1682 | case NETDEV_GOING_DOWN: | |
97c8389d | 1683 | link_possible = 0; |
85b4aa49 RL |
1684 | break; |
1685 | case NETDEV_UP: | |
1686 | case NETDEV_CHANGE: | |
85b4aa49 RL |
1687 | break; |
1688 | case NETDEV_CHANGEMTU: | |
7221d7e5 YZ |
1689 | if (netdev->features & NETIF_F_FCOE_MTU) |
1690 | break; | |
1d1b88dc VD |
1691 | mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + |
1692 | sizeof(struct fcoe_crc_eof)); | |
85b4aa49 RL |
1693 | if (mfs >= FC_MIN_MAX_FRAME) |
1694 | fc_set_mfs(lp, mfs); | |
85b4aa49 RL |
1695 | break; |
1696 | case NETDEV_REGISTER: | |
1697 | break; | |
2e70e241 CL |
1698 | case NETDEV_UNREGISTER: |
1699 | list_del(&fcoe->list); | |
1700 | port = lport_priv(fcoe->ctlr.lp); | |
1701 | fcoe_interface_cleanup(fcoe); | |
1702 | schedule_work(&port->destroy_work); | |
1703 | goto out; | |
1704 | break; | |
85b4aa49 | 1705 | default: |
1d1b88dc | 1706 | FCOE_NETDEV_DBG(netdev, "Unknown event %ld " |
d5488eb9 | 1707 | "from netdev netlink\n", event); |
85b4aa49 | 1708 | } |
97c8389d | 1709 | if (link_possible && !fcoe_link_ok(lp)) |
3fe9a0ba CL |
1710 | fcoe_ctlr_link_up(&fcoe->ctlr); |
1711 | else if (fcoe_ctlr_link_down(&fcoe->ctlr)) { | |
97c8389d JE |
1712 | stats = fc_lport_get_stats(lp); |
1713 | stats->LinkFailureCount++; | |
1714 | fcoe_clean_pending_queue(lp); | |
85b4aa49 RL |
1715 | } |
1716 | out: | |
1717 | return rc; | |
1718 | } | |
1719 | ||
1720 | /** | |
34f42a07 | 1721 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
1722 | * @buffer: incoming buffer to be copied |
1723 | * | |
dd3fd72e | 1724 | * Returns: NULL or ptr to net_device |
34f42a07 | 1725 | */ |
85b4aa49 RL |
1726 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
1727 | { | |
1728 | char *cp; | |
1729 | char ifname[IFNAMSIZ + 2]; | |
1730 | ||
1731 | if (buffer) { | |
1732 | strlcpy(ifname, buffer, IFNAMSIZ); | |
1733 | cp = ifname + strlen(ifname); | |
1734 | while (--cp >= ifname && *cp == '\n') | |
1735 | *cp = '\0'; | |
1736 | return dev_get_by_name(&init_net, ifname); | |
1737 | } | |
1738 | return NULL; | |
1739 | } | |
1740 | ||
85b4aa49 | 1741 | /** |
34f42a07 | 1742 | * fcoe_destroy() - handles the destroy from sysfs |
dd3fd72e | 1743 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1744 | * @kp: associated kernel param |
1745 | * | |
1746 | * Returns: 0 for success | |
34f42a07 | 1747 | */ |
85b4aa49 RL |
1748 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
1749 | { | |
030f4e00 | 1750 | struct fcoe_interface *fcoe; |
2e70e241 | 1751 | struct net_device *netdev; |
8eca355f | 1752 | int rc = 0; |
85b4aa49 | 1753 | |
dfc1d0fe CL |
1754 | mutex_lock(&fcoe_config_mutex); |
1755 | #ifdef CONFIG_FCOE_MODULE | |
1756 | /* | |
1757 | * Make sure the module has been initialized, and is not about to be | |
1758 | * removed. Module paramter sysfs files are writable before the | |
1759 | * module_init function is called and after module_exit. | |
1760 | */ | |
1761 | if (THIS_MODULE->state != MODULE_STATE_LIVE) { | |
1762 | rc = -ENODEV; | |
1763 | goto out_nodev; | |
1764 | } | |
1765 | #endif | |
1766 | ||
85b4aa49 RL |
1767 | netdev = fcoe_if_to_netdev(buffer); |
1768 | if (!netdev) { | |
1769 | rc = -ENODEV; | |
1770 | goto out_nodev; | |
1771 | } | |
2e70e241 | 1772 | |
090eb6c4 | 1773 | rtnl_lock(); |
2e70e241 CL |
1774 | fcoe = fcoe_hostlist_lookup_port(netdev); |
1775 | if (!fcoe) { | |
090eb6c4 | 1776 | rtnl_unlock(); |
85b4aa49 RL |
1777 | rc = -ENODEV; |
1778 | goto out_putdev; | |
1779 | } | |
2e70e241 | 1780 | list_del(&fcoe->list); |
2e70e241 CL |
1781 | fcoe_interface_cleanup(fcoe); |
1782 | rtnl_unlock(); | |
1783 | fcoe_if_destroy(fcoe->ctlr.lp); | |
85b4aa49 RL |
1784 | out_putdev: |
1785 | dev_put(netdev); | |
1786 | out_nodev: | |
dfc1d0fe | 1787 | mutex_unlock(&fcoe_config_mutex); |
85b4aa49 RL |
1788 | return rc; |
1789 | } | |
1790 | ||
2e70e241 CL |
1791 | static void fcoe_destroy_work(struct work_struct *work) |
1792 | { | |
1793 | struct fcoe_port *port; | |
1794 | ||
1795 | port = container_of(work, struct fcoe_port, destroy_work); | |
1796 | mutex_lock(&fcoe_config_mutex); | |
1797 | fcoe_if_destroy(port->lport); | |
1798 | mutex_unlock(&fcoe_config_mutex); | |
1799 | } | |
1800 | ||
85b4aa49 | 1801 | /** |
34f42a07 | 1802 | * fcoe_create() - Handles the create call from sysfs |
dd3fd72e | 1803 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1804 | * @kp: associated kernel param |
1805 | * | |
1806 | * Returns: 0 for success | |
34f42a07 | 1807 | */ |
85b4aa49 RL |
1808 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1809 | { | |
1810 | int rc; | |
030f4e00 | 1811 | struct fcoe_interface *fcoe; |
af7f85d9 | 1812 | struct fc_lport *lport; |
85b4aa49 RL |
1813 | struct net_device *netdev; |
1814 | ||
dfc1d0fe CL |
1815 | mutex_lock(&fcoe_config_mutex); |
1816 | #ifdef CONFIG_FCOE_MODULE | |
1817 | /* | |
1818 | * Make sure the module has been initialized, and is not about to be | |
1819 | * removed. Module paramter sysfs files are writable before the | |
1820 | * module_init function is called and after module_exit. | |
1821 | */ | |
1822 | if (THIS_MODULE->state != MODULE_STATE_LIVE) { | |
1823 | rc = -ENODEV; | |
1824 | goto out_nodev; | |
1825 | } | |
1826 | #endif | |
1827 | ||
2e70e241 | 1828 | rtnl_lock(); |
85b4aa49 RL |
1829 | netdev = fcoe_if_to_netdev(buffer); |
1830 | if (!netdev) { | |
1831 | rc = -ENODEV; | |
1832 | goto out_nodev; | |
1833 | } | |
2e70e241 | 1834 | |
85b4aa49 RL |
1835 | /* look for existing lport */ |
1836 | if (fcoe_hostlist_lookup(netdev)) { | |
1837 | rc = -EEXIST; | |
1838 | goto out_putdev; | |
1839 | } | |
85b4aa49 | 1840 | |
030f4e00 CL |
1841 | fcoe = fcoe_interface_create(netdev); |
1842 | if (!fcoe) { | |
1843 | rc = -ENOMEM; | |
1844 | goto out_putdev; | |
1845 | } | |
1846 | ||
9a05753b | 1847 | lport = fcoe_if_create(fcoe, &netdev->dev, 0); |
af7f85d9 | 1848 | if (IS_ERR(lport)) { |
d5488eb9 | 1849 | printk(KERN_ERR "fcoe: Failed to create interface (%s)\n", |
85b4aa49 | 1850 | netdev->name); |
85b4aa49 | 1851 | rc = -EIO; |
2e70e241 | 1852 | fcoe_interface_cleanup(fcoe); |
030f4e00 | 1853 | goto out_free; |
85b4aa49 | 1854 | } |
030f4e00 | 1855 | |
54b649f8 CL |
1856 | /* Make this the "master" N_Port */ |
1857 | fcoe->ctlr.lp = lport; | |
1858 | ||
c863df33 CL |
1859 | /* add to lports list */ |
1860 | fcoe_hostlist_add(lport); | |
1861 | ||
54b649f8 CL |
1862 | /* start FIP Discovery and FLOGI */ |
1863 | lport->boot_time = jiffies; | |
1864 | fc_fabric_login(lport); | |
1865 | if (!fcoe_link_ok(lport)) | |
1866 | fcoe_ctlr_link_up(&fcoe->ctlr); | |
030f4e00 | 1867 | |
54b649f8 | 1868 | rc = 0; |
030f4e00 | 1869 | out_free: |
54b649f8 CL |
1870 | /* |
1871 | * Release from init in fcoe_interface_create(), on success lport | |
1872 | * should be holding a reference taken in fcoe_if_create(). | |
1873 | */ | |
030f4e00 | 1874 | fcoe_interface_put(fcoe); |
85b4aa49 RL |
1875 | out_putdev: |
1876 | dev_put(netdev); | |
1877 | out_nodev: | |
2e70e241 | 1878 | rtnl_unlock(); |
dfc1d0fe | 1879 | mutex_unlock(&fcoe_config_mutex); |
85b4aa49 RL |
1880 | return rc; |
1881 | } | |
1882 | ||
1883 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1884 | __MODULE_PARM_TYPE(create, "string"); | |
014f5c3f | 1885 | MODULE_PARM_DESC(create, "Create fcoe fcoe using net device passed in."); |
85b4aa49 RL |
1886 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); |
1887 | __MODULE_PARM_TYPE(destroy, "string"); | |
014f5c3f | 1888 | MODULE_PARM_DESC(destroy, "Destroy fcoe fcoe"); |
85b4aa49 | 1889 | |
34f42a07 RL |
1890 | /** |
1891 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1892 | * @lp: ptr to the fc_lport |
1893 | * | |
1894 | * Any permanently-disqualifying conditions have been previously checked. | |
1895 | * This also updates the speed setting, which may change with link for 100/1000. | |
1896 | * | |
1897 | * This function should probably be checking for PAUSE support at some point | |
1898 | * in the future. Currently Per-priority-pause is not determinable using | |
1899 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1900 | * | |
1901 | * Returns: 0 if link is OK for use by FCoE. | |
1902 | * | |
1903 | */ | |
1904 | int fcoe_link_ok(struct fc_lport *lp) | |
1905 | { | |
014f5c3f | 1906 | struct fcoe_port *port = lport_priv(lp); |
25024989 | 1907 | struct net_device *dev = port->fcoe->netdev; |
85b4aa49 | 1908 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; |
85b4aa49 | 1909 | |
2f718d64 YZ |
1910 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && |
1911 | (!dev_ethtool_get_settings(dev, &ecmd))) { | |
1912 | lp->link_supported_speeds &= | |
1913 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1914 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1915 | SUPPORTED_1000baseT_Full)) | |
1916 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1917 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1918 | lp->link_supported_speeds |= | |
1919 | FC_PORTSPEED_10GBIT; | |
1920 | if (ecmd.speed == SPEED_1000) | |
1921 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1922 | if (ecmd.speed == SPEED_10000) | |
1923 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
85b4aa49 | 1924 | |
2f718d64 YZ |
1925 | return 0; |
1926 | } | |
1927 | return -1; | |
85b4aa49 | 1928 | } |
85b4aa49 | 1929 | |
34f42a07 RL |
1930 | /** |
1931 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 | 1932 | * @lp: the fc_lport |
e7a51997 JE |
1933 | * |
1934 | * Must be called with fcoe_create_mutex held to single-thread completion. | |
1935 | * | |
1936 | * This flushes the pending skbs by adding a new skb to each queue and | |
1937 | * waiting until they are all freed. This assures us that not only are | |
1938 | * there no packets that will be handled by the lport, but also that any | |
1939 | * threads already handling packet have returned. | |
85b4aa49 RL |
1940 | */ |
1941 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1942 | { | |
85b4aa49 RL |
1943 | struct fcoe_percpu_s *pp; |
1944 | struct fcoe_rcv_info *fr; | |
1945 | struct sk_buff_head *list; | |
1946 | struct sk_buff *skb, *next; | |
1947 | struct sk_buff *head; | |
5e5e92df | 1948 | unsigned int cpu; |
85b4aa49 | 1949 | |
5e5e92df RL |
1950 | for_each_possible_cpu(cpu) { |
1951 | pp = &per_cpu(fcoe_percpu, cpu); | |
1952 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1953 | list = &pp->fcoe_rx_list; | |
1954 | head = list->next; | |
1955 | for (skb = head; skb != (struct sk_buff *)list; | |
1956 | skb = next) { | |
1957 | next = skb->next; | |
1958 | fr = fcoe_dev_from_skb(skb); | |
1959 | if (fr->fr_dev == lp) { | |
1960 | __skb_unlink(skb, list); | |
1961 | kfree_skb(skb); | |
85b4aa49 | 1962 | } |
85b4aa49 | 1963 | } |
e7a51997 JE |
1964 | |
1965 | if (!pp->thread || !cpu_online(cpu)) { | |
1966 | spin_unlock_bh(&pp->fcoe_rx_list.lock); | |
1967 | continue; | |
1968 | } | |
1969 | ||
1970 | skb = dev_alloc_skb(0); | |
1971 | if (!skb) { | |
1972 | spin_unlock_bh(&pp->fcoe_rx_list.lock); | |
1973 | continue; | |
1974 | } | |
1975 | skb->destructor = fcoe_percpu_flush_done; | |
1976 | ||
1977 | __skb_queue_tail(&pp->fcoe_rx_list, skb); | |
1978 | if (pp->fcoe_rx_list.qlen == 1) | |
1979 | wake_up_process(pp->thread); | |
5e5e92df | 1980 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
e7a51997 JE |
1981 | |
1982 | wait_for_completion(&fcoe_flush_completion); | |
85b4aa49 RL |
1983 | } |
1984 | } | |
85b4aa49 RL |
1985 | |
1986 | /** | |
34f42a07 | 1987 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1988 | * @lp: the corresponding fc_lport |
1989 | * | |
1990 | * Returns: none | |
34f42a07 | 1991 | */ |
85b4aa49 RL |
1992 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1993 | { | |
014f5c3f | 1994 | struct fcoe_port *port = lport_priv(lp); |
85b4aa49 RL |
1995 | struct sk_buff *skb; |
1996 | ||
014f5c3f CL |
1997 | spin_lock_bh(&port->fcoe_pending_queue.lock); |
1998 | while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) { | |
1999 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
85b4aa49 | 2000 | kfree_skb(skb); |
014f5c3f | 2001 | spin_lock_bh(&port->fcoe_pending_queue.lock); |
85b4aa49 | 2002 | } |
014f5c3f | 2003 | spin_unlock_bh(&port->fcoe_pending_queue.lock); |
85b4aa49 | 2004 | } |
85b4aa49 | 2005 | |
34f42a07 RL |
2006 | /** |
2007 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
2008 | * @shost: shost the reset is from |
2009 | * | |
2010 | * Returns: always 0 | |
2011 | */ | |
2012 | int fcoe_reset(struct Scsi_Host *shost) | |
2013 | { | |
2014 | struct fc_lport *lport = shost_priv(shost); | |
2015 | fc_lport_reset(lport); | |
2016 | return 0; | |
2017 | } | |
85b4aa49 | 2018 | |
34f42a07 | 2019 | /** |
014f5c3f | 2020 | * fcoe_hostlist_lookup_port() - find the corresponding lport by a given device |
dd3fd72e | 2021 | * @dev: this is currently ptr to net_device |
85b4aa49 | 2022 | * |
014f5c3f | 2023 | * Returns: NULL or the located fcoe_port |
090eb6c4 | 2024 | * Locking: must be called with the RNL mutex held |
85b4aa49 | 2025 | */ |
014f5c3f CL |
2026 | static struct fcoe_interface * |
2027 | fcoe_hostlist_lookup_port(const struct net_device *dev) | |
85b4aa49 | 2028 | { |
014f5c3f | 2029 | struct fcoe_interface *fcoe; |
85b4aa49 | 2030 | |
014f5c3f | 2031 | list_for_each_entry(fcoe, &fcoe_hostlist, list) { |
25024989 | 2032 | if (fcoe->netdev == dev) |
014f5c3f | 2033 | return fcoe; |
85b4aa49 | 2034 | } |
85b4aa49 RL |
2035 | return NULL; |
2036 | } | |
2037 | ||
34f42a07 RL |
2038 | /** |
2039 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
2040 | * @netdev: ptr to net_device |
2041 | * | |
2042 | * Returns: 0 for success | |
090eb6c4 | 2043 | * Locking: must be called with the RTNL mutex held |
85b4aa49 | 2044 | */ |
090eb6c4 | 2045 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) |
85b4aa49 | 2046 | { |
014f5c3f | 2047 | struct fcoe_interface *fcoe; |
85b4aa49 | 2048 | |
014f5c3f | 2049 | fcoe = fcoe_hostlist_lookup_port(netdev); |
3fe9a0ba | 2050 | return (fcoe) ? fcoe->ctlr.lp : NULL; |
85b4aa49 | 2051 | } |
85b4aa49 | 2052 | |
34f42a07 RL |
2053 | /** |
2054 | * fcoe_hostlist_add() - Add a lport to lports list | |
dd3fd72e | 2055 | * @lp: ptr to the fc_lport to be added |
85b4aa49 RL |
2056 | * |
2057 | * Returns: 0 for success | |
090eb6c4 | 2058 | * Locking: must be called with the RTNL mutex held |
85b4aa49 | 2059 | */ |
090eb6c4 | 2060 | static int fcoe_hostlist_add(const struct fc_lport *lport) |
85b4aa49 | 2061 | { |
014f5c3f CL |
2062 | struct fcoe_interface *fcoe; |
2063 | struct fcoe_port *port; | |
2064 | ||
2065 | fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport)); | |
2066 | if (!fcoe) { | |
2067 | port = lport_priv(lport); | |
2068 | fcoe = port->fcoe; | |
2069 | list_add_tail(&fcoe->list, &fcoe_hostlist); | |
85b4aa49 RL |
2070 | } |
2071 | return 0; | |
2072 | } | |
85b4aa49 | 2073 | |
85b4aa49 | 2074 | /** |
34f42a07 | 2075 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 | 2076 | * |
85b4aa49 | 2077 | * Returns 0 on success, negative on failure |
34f42a07 | 2078 | */ |
85b4aa49 RL |
2079 | static int __init fcoe_init(void) |
2080 | { | |
38eccabd | 2081 | unsigned int cpu; |
8976f424 | 2082 | int rc = 0; |
85b4aa49 RL |
2083 | struct fcoe_percpu_s *p; |
2084 | ||
dfc1d0fe CL |
2085 | mutex_lock(&fcoe_config_mutex); |
2086 | ||
38eccabd | 2087 | for_each_possible_cpu(cpu) { |
5e5e92df | 2088 | p = &per_cpu(fcoe_percpu, cpu); |
38eccabd RL |
2089 | skb_queue_head_init(&p->fcoe_rx_list); |
2090 | } | |
2091 | ||
8976f424 RL |
2092 | for_each_online_cpu(cpu) |
2093 | fcoe_percpu_thread_create(cpu); | |
85b4aa49 | 2094 | |
8976f424 RL |
2095 | /* Initialize per CPU interrupt thread */ |
2096 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); | |
2097 | if (rc) | |
2098 | goto out_free; | |
85b4aa49 | 2099 | |
8976f424 | 2100 | /* Setup link change notification */ |
85b4aa49 RL |
2101 | fcoe_dev_setup(); |
2102 | ||
5892c32f CL |
2103 | rc = fcoe_if_init(); |
2104 | if (rc) | |
2105 | goto out_free; | |
85b4aa49 | 2106 | |
dfc1d0fe | 2107 | mutex_unlock(&fcoe_config_mutex); |
85b4aa49 | 2108 | return 0; |
8976f424 RL |
2109 | |
2110 | out_free: | |
2111 | for_each_online_cpu(cpu) { | |
2112 | fcoe_percpu_thread_destroy(cpu); | |
2113 | } | |
dfc1d0fe | 2114 | mutex_unlock(&fcoe_config_mutex); |
8976f424 | 2115 | return rc; |
85b4aa49 RL |
2116 | } |
2117 | module_init(fcoe_init); | |
2118 | ||
2119 | /** | |
34f42a07 | 2120 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
2121 | * |
2122 | * Returns 0 on success, negative on failure | |
34f42a07 | 2123 | */ |
85b4aa49 RL |
2124 | static void __exit fcoe_exit(void) |
2125 | { | |
5e5e92df | 2126 | unsigned int cpu; |
014f5c3f | 2127 | struct fcoe_interface *fcoe, *tmp; |
2e70e241 | 2128 | struct fcoe_port *port; |
85b4aa49 | 2129 | |
dfc1d0fe CL |
2130 | mutex_lock(&fcoe_config_mutex); |
2131 | ||
85b4aa49 RL |
2132 | fcoe_dev_cleanup(); |
2133 | ||
5919a595 | 2134 | /* releases the associated fcoe hosts */ |
090eb6c4 CL |
2135 | rtnl_lock(); |
2136 | list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) { | |
c863df33 | 2137 | list_del(&fcoe->list); |
2e70e241 | 2138 | port = lport_priv(fcoe->ctlr.lp); |
2e70e241 | 2139 | fcoe_interface_cleanup(fcoe); |
2e70e241 | 2140 | schedule_work(&port->destroy_work); |
c863df33 | 2141 | } |
090eb6c4 | 2142 | rtnl_unlock(); |
85b4aa49 | 2143 | |
8976f424 RL |
2144 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
2145 | ||
014f5c3f | 2146 | for_each_online_cpu(cpu) |
8976f424 | 2147 | fcoe_percpu_thread_destroy(cpu); |
85b4aa49 | 2148 | |
dfc1d0fe | 2149 | mutex_unlock(&fcoe_config_mutex); |
2e70e241 CL |
2150 | |
2151 | /* flush any asyncronous interface destroys, | |
2152 | * this should happen after the netdev notifier is unregistered */ | |
2153 | flush_scheduled_work(); | |
9a05753b CL |
2154 | /* That will flush out all the N_Ports on the hostlist, but now we |
2155 | * may have NPIV VN_Ports scheduled for destruction */ | |
2156 | flush_scheduled_work(); | |
2e70e241 CL |
2157 | |
2158 | /* detach from scsi transport | |
2159 | * must happen after all destroys are done, therefor after the flush */ | |
2160 | fcoe_if_exit(); | |
85b4aa49 RL |
2161 | } |
2162 | module_exit(fcoe_exit); | |
11b56188 CL |
2163 | |
2164 | /** | |
2165 | * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler | |
2166 | * @seq: active sequence in the FLOGI or FDISC exchange | |
2167 | * @fp: response frame, or error encoded in a pointer (timeout) | |
2168 | * @arg: pointer the the fcoe_ctlr structure | |
2169 | * | |
2170 | * This handles MAC address managment for FCoE, then passes control on to | |
2171 | * the libfc FLOGI response handler. | |
2172 | */ | |
2173 | static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
2174 | { | |
2175 | struct fcoe_ctlr *fip = arg; | |
2176 | struct fc_exch *exch = fc_seq_exch(seq); | |
2177 | struct fc_lport *lport = exch->lp; | |
2178 | u8 *mac; | |
2179 | ||
2180 | if (IS_ERR(fp)) | |
2181 | goto done; | |
2182 | ||
2183 | mac = fr_cb(fp)->granted_mac; | |
2184 | if (is_zero_ether_addr(mac)) { | |
2185 | /* pre-FIP */ | |
2186 | mac = eth_hdr(&fp->skb)->h_source; | |
2187 | if (fcoe_ctlr_recv_flogi(fip, lport, fp, mac)) { | |
2188 | fc_frame_free(fp); | |
2189 | return; | |
2190 | } | |
2191 | } else { | |
2192 | /* FIP, libfcoe has already seen it */ | |
2193 | fip->update_mac(lport, fr_cb(fp)->granted_mac); | |
2194 | } | |
2195 | done: | |
2196 | fc_lport_flogi_resp(seq, fp, lport); | |
2197 | } | |
2198 | ||
2199 | /** | |
2200 | * fcoe_logo_resp() - FCoE specific LOGO response handler | |
2201 | * @seq: active sequence in the LOGO exchange | |
2202 | * @fp: response frame, or error encoded in a pointer (timeout) | |
2203 | * @arg: pointer the the fcoe_ctlr structure | |
2204 | * | |
2205 | * This handles MAC address managment for FCoE, then passes control on to | |
2206 | * the libfc LOGO response handler. | |
2207 | */ | |
2208 | static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
2209 | { | |
2210 | struct fcoe_ctlr *fip = arg; | |
2211 | struct fc_exch *exch = fc_seq_exch(seq); | |
2212 | struct fc_lport *lport = exch->lp; | |
2213 | static u8 zero_mac[ETH_ALEN] = { 0 }; | |
2214 | ||
2215 | if (!IS_ERR(fp)) | |
2216 | fip->update_mac(lport, zero_mac); | |
2217 | fc_lport_logo_resp(seq, fp, lport); | |
2218 | } | |
2219 | ||
2220 | /** | |
2221 | * fcoe_elsct_send - FCoE specific ELS handler | |
2222 | * | |
2223 | * This does special case handling of FIP encapsualted ELS exchanges for FCoE, | |
2224 | * using FCoE specific response handlers and passing the FIP controller as | |
2225 | * the argument (the lport is still available from the exchange). | |
2226 | * | |
2227 | * Most of the work here is just handed off to the libfc routine. | |
2228 | */ | |
2229 | static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, | |
2230 | u32 did, struct fc_frame *fp, unsigned int op, | |
2231 | void (*resp)(struct fc_seq *, struct fc_frame *, void *), | |
2232 | void *arg, u32 timeout) | |
2233 | { | |
2234 | struct fcoe_port *port = lport_priv(lport); | |
2235 | struct fcoe_interface *fcoe = port->fcoe; | |
2236 | struct fcoe_ctlr *fip = &fcoe->ctlr; | |
2237 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
2238 | ||
2239 | switch (op) { | |
2240 | case ELS_FLOGI: | |
2241 | case ELS_FDISC: | |
2242 | return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp, | |
2243 | fip, timeout); | |
2244 | case ELS_LOGO: | |
2245 | /* only hook onto fabric logouts, not port logouts */ | |
2246 | if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) | |
2247 | break; | |
2248 | return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp, | |
2249 | fip, timeout); | |
2250 | } | |
2251 | return fc_elsct_send(lport, did, fp, op, resp, arg, timeout); | |
2252 | } | |
2253 | ||
9a05753b CL |
2254 | /** |
2255 | * fcoe_vport_create() - create an fc_host/scsi_host for a vport | |
2256 | * @vport: fc_vport object to create a new fc_host for | |
2257 | * @disabled: start the new fc_host in a disabled state by default? | |
2258 | * | |
2259 | * Returns: 0 for success | |
2260 | */ | |
2261 | static int fcoe_vport_create(struct fc_vport *vport, bool disabled) | |
2262 | { | |
2263 | struct Scsi_Host *shost = vport_to_shost(vport); | |
2264 | struct fc_lport *n_port = shost_priv(shost); | |
2265 | struct fcoe_port *port = lport_priv(n_port); | |
2266 | struct fcoe_interface *fcoe = port->fcoe; | |
2267 | struct net_device *netdev = fcoe->netdev; | |
2268 | struct fc_lport *vn_port; | |
2269 | ||
2270 | mutex_lock(&fcoe_config_mutex); | |
2271 | vn_port = fcoe_if_create(fcoe, &vport->dev, 1); | |
2272 | mutex_unlock(&fcoe_config_mutex); | |
2273 | ||
2274 | if (IS_ERR(vn_port)) { | |
2275 | printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n", | |
2276 | netdev->name); | |
2277 | return -EIO; | |
2278 | } | |
2279 | ||
2280 | if (disabled) { | |
2281 | fc_vport_set_state(vport, FC_VPORT_DISABLED); | |
2282 | } else { | |
2283 | vn_port->boot_time = jiffies; | |
2284 | fc_fabric_login(vn_port); | |
2285 | fc_vport_setlink(vn_port); | |
2286 | } | |
2287 | return 0; | |
2288 | } | |
2289 | ||
2290 | /** | |
2291 | * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport | |
2292 | * @vport: fc_vport object that is being destroyed | |
2293 | * | |
2294 | * Returns: 0 for success | |
2295 | */ | |
2296 | static int fcoe_vport_destroy(struct fc_vport *vport) | |
2297 | { | |
2298 | struct Scsi_Host *shost = vport_to_shost(vport); | |
2299 | struct fc_lport *n_port = shost_priv(shost); | |
2300 | struct fc_lport *vn_port = vport->dd_data; | |
2301 | struct fcoe_port *port = lport_priv(vn_port); | |
2302 | ||
2303 | mutex_lock(&n_port->lp_mutex); | |
2304 | list_del(&vn_port->list); | |
2305 | mutex_unlock(&n_port->lp_mutex); | |
2306 | schedule_work(&port->destroy_work); | |
2307 | return 0; | |
2308 | } | |
2309 | ||
2310 | /** | |
2311 | * fcoe_vport_disable() - change vport state | |
2312 | * @vport: vport to bring online/offline | |
2313 | * @disable: should the vport be disabled? | |
2314 | */ | |
2315 | static int fcoe_vport_disable(struct fc_vport *vport, bool disable) | |
2316 | { | |
2317 | struct fc_lport *lport = vport->dd_data; | |
2318 | ||
2319 | if (disable) { | |
2320 | fc_vport_set_state(vport, FC_VPORT_DISABLED); | |
2321 | fc_fabric_logoff(lport); | |
2322 | } else { | |
2323 | lport->boot_time = jiffies; | |
2324 | fc_fabric_login(lport); | |
2325 | fc_vport_setlink(lport); | |
2326 | } | |
2327 | ||
2328 | return 0; | |
2329 | } | |
2330 | ||
dc8596d3 CL |
2331 | /** |
2332 | * fcoe_vport_set_symbolic_name() - append vport string to symbolic name | |
2333 | * @vport: fc_vport with a new symbolic name string | |
2334 | * | |
2335 | * After generating a new symbolic name string, a new RSPN_ID request is | |
2336 | * sent to the name server. There is no response handler, so if it fails | |
2337 | * for some reason it will not be retried. | |
2338 | */ | |
2339 | static void fcoe_set_vport_symbolic_name(struct fc_vport *vport) | |
2340 | { | |
2341 | struct fc_lport *lport = vport->dd_data; | |
2342 | struct fc_frame *fp; | |
2343 | size_t len; | |
2344 | ||
2345 | snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, | |
2346 | "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION, | |
2347 | fcoe_netdev(lport)->name, vport->symbolic_name); | |
2348 | ||
2349 | if (lport->state != LPORT_ST_READY) | |
2350 | return; | |
2351 | ||
2352 | len = strnlen(fc_host_symbolic_name(lport->host), 255); | |
2353 | fp = fc_frame_alloc(lport, | |
2354 | sizeof(struct fc_ct_hdr) + | |
2355 | sizeof(struct fc_ns_rspn) + len); | |
2356 | if (!fp) | |
2357 | return; | |
2358 | lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID, | |
2359 | NULL, NULL, lport->e_d_tov); | |
2360 | } | |
2361 |