1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
4 *
5 * Maintained at www.Open-FCoE.org
6 */
7
8 #include <linux/module.h>
9 #include <linux/spinlock.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <linux/ethtool.h>
13 #include <linux/if_ether.h>
14 #include <linux/if_vlan.h>
15 #include <linux/crc32.h>
16 #include <linux/slab.h>
17 #include <linux/cpu.h>
18 #include <linux/fs.h>
19 #include <linux/sysfs.h>
20 #include <linux/ctype.h>
21 #include <linux/workqueue.h>
22 #include <net/dcbnl.h>
23 #include <net/dcbevent.h>
24 #include <scsi/scsi_tcq.h>
25 #include <scsi/scsicam.h>
26 #include <scsi/scsi_transport.h>
27 #include <scsi/scsi_transport_fc.h>
28 #include <net/rtnetlink.h>
29
30 #include <scsi/fc/fc_encaps.h>
31 #include <scsi/fc/fc_fip.h>
32 #include <scsi/fc/fc_fcoe.h>
33
34 #include <scsi/libfc.h>
35 #include <scsi/fc_frame.h>
36 #include <scsi/libfcoe.h>
37
38 #include "fcoe.h"
39
40 MODULE_AUTHOR("Open-FCoE.org");
41 MODULE_DESCRIPTION("FCoE");
42 MODULE_LICENSE("GPL v2");
43
44 /* Performance tuning parameters for fcoe */
45 static unsigned int fcoe_ddp_min = 4096;
46 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
47 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \
48 "Direct Data Placement (DDP).");
49
50 unsigned int fcoe_debug_logging;
51 module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR);
52 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
53
54 static unsigned int fcoe_e_d_tov = 2 * 1000;
55 module_param_named(e_d_tov, fcoe_e_d_tov, int, S_IRUGO|S_IWUSR);
56 MODULE_PARM_DESC(e_d_tov, "E_D_TOV in ms, default 2000");
57
58 static unsigned int fcoe_r_a_tov = 2 * 2 * 1000;
59 module_param_named(r_a_tov, fcoe_r_a_tov, int, S_IRUGO|S_IWUSR);
60 MODULE_PARM_DESC(r_a_tov, "R_A_TOV in ms, default 4000");
61
62 static DEFINE_MUTEX(fcoe_config_mutex);
63
64 static struct workqueue_struct *fcoe_wq;
65
66 /* fcoe host list */
67 /* must only by accessed under the RTNL mutex */
68 static LIST_HEAD(fcoe_hostlist);
69 static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
70
71 /* Function Prototypes */
72 static int fcoe_reset(struct Scsi_Host *);
73 static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
74 static int fcoe_rcv(struct sk_buff *, struct net_device *,
75 struct packet_type *, struct net_device *);
76 static void fcoe_percpu_clean(struct fc_lport *);
77 static int fcoe_link_ok(struct fc_lport *);
78
79 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
80 static int fcoe_hostlist_add(const struct fc_lport *);
81 static void fcoe_hostlist_del(const struct fc_lport *);
82
83 static int fcoe_device_notification(struct notifier_block *, ulong, void *);
84 static void fcoe_dev_setup(void);
85 static void fcoe_dev_cleanup(void);
86 static struct fcoe_interface
87 *fcoe_hostlist_lookup_port(const struct net_device *);
88
89 static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
90 struct packet_type *, struct net_device *);
91 static int fcoe_fip_vlan_recv(struct sk_buff *, struct net_device *,
92 struct packet_type *, struct net_device *);
93
94 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
95 static void fcoe_update_src_mac(struct fc_lport *, u8 *);
96 static u8 *fcoe_get_src_mac(struct fc_lport *);
97 static void fcoe_destroy_work(struct work_struct *);
98
99 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
100 unsigned int);
101 static int fcoe_ddp_done(struct fc_lport *, u16);
102 static int fcoe_ddp_target(struct fc_lport *, u16, struct scatterlist *,
103 unsigned int);
104 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
105 ulong event, void *ptr);
106
107 static bool fcoe_match(struct net_device *netdev);
108 static int fcoe_create(struct net_device *netdev, enum fip_mode fip_mode);
109 static int fcoe_destroy(struct net_device *netdev);
110 static int fcoe_enable(struct net_device *netdev);
111 static int fcoe_disable(struct net_device *netdev);
112
113 /* fcoe_syfs control interface handlers */
114 static int fcoe_ctlr_alloc(struct net_device *netdev);
115 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev);
116 static void fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev);
117
118 static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
119 u32 did, struct fc_frame *,
120 unsigned int op,
121 void (*resp)(struct fc_seq *,
122 struct fc_frame *,
123 void *),
124 void *, u32 timeout);
125 static void fcoe_recv_frame(struct sk_buff *skb);
126
127 /* notification function for packets from net device */
128 static struct notifier_block fcoe_notifier = {
129 .notifier_call = fcoe_device_notification,
130 };
131
132 /* notification function for DCB events */
133 static struct notifier_block dcb_notifier = {
134 .notifier_call = fcoe_dcb_app_notification,
135 };
136
137 static struct scsi_transport_template *fcoe_nport_scsi_transport;
138 static struct scsi_transport_template *fcoe_vport_scsi_transport;
139
140 static int fcoe_vport_destroy(struct fc_vport *);
141 static int fcoe_vport_create(struct fc_vport *, bool disabled);
142 static int fcoe_vport_disable(struct fc_vport *, bool disable);
143 static void fcoe_set_vport_symbolic_name(struct fc_vport *);
144 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
145 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *);
146 static void fcoe_vport_remove(struct fc_lport *);
147
148 static struct fcoe_sysfs_function_template fcoe_sysfs_templ = {
149 .set_fcoe_ctlr_mode = fcoe_ctlr_mode,
150 .set_fcoe_ctlr_enabled = fcoe_ctlr_enabled,
151 .get_fcoe_ctlr_link_fail = fcoe_ctlr_get_lesb,
152 .get_fcoe_ctlr_vlink_fail = fcoe_ctlr_get_lesb,
153 .get_fcoe_ctlr_miss_fka = fcoe_ctlr_get_lesb,
154 .get_fcoe_ctlr_symb_err = fcoe_ctlr_get_lesb,
155 .get_fcoe_ctlr_err_block = fcoe_ctlr_get_lesb,
156 .get_fcoe_ctlr_fcs_error = fcoe_ctlr_get_lesb,
157
158 .get_fcoe_fcf_selected = fcoe_fcf_get_selected,
159 .get_fcoe_fcf_vlan_id = fcoe_fcf_get_vlan_id,
160 };
161
162 static struct libfc_function_template fcoe_libfc_fcn_templ = {
163 .frame_send = fcoe_xmit,
164 .ddp_setup = fcoe_ddp_setup,
165 .ddp_done = fcoe_ddp_done,
166 .ddp_target = fcoe_ddp_target,
167 .elsct_send = fcoe_elsct_send,
168 .get_lesb = fcoe_get_lesb,
169 .lport_set_port_id = fcoe_set_port_id,
170 };
171
172 static struct fc_function_template fcoe_nport_fc_functions = {
173 .show_host_node_name = 1,
174 .show_host_port_name = 1,
175 .show_host_supported_classes = 1,
176 .show_host_supported_fc4s = 1,
177 .show_host_active_fc4s = 1,
178 .show_host_maxframe_size = 1,
179 .show_host_serial_number = 1,
180 .show_host_manufacturer = 1,
181 .show_host_model = 1,
182 .show_host_model_description = 1,
183 .show_host_hardware_version = 1,
184 .show_host_driver_version = 1,
185 .show_host_firmware_version = 1,
186 .show_host_optionrom_version = 1,
187
188 .show_host_port_id = 1,
189 .show_host_supported_speeds = 1,
190 .get_host_speed = fc_get_host_speed,
191 .show_host_speed = 1,
192 .show_host_port_type = 1,
193 .get_host_port_state = fc_get_host_port_state,
194 .show_host_port_state = 1,
195 .show_host_symbolic_name = 1,
196
197 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
198 .show_rport_maxframe_size = 1,
199 .show_rport_supported_classes = 1,
200
201 .show_host_fabric_name = 1,
202 .show_starget_node_name = 1,
203 .show_starget_port_name = 1,
204 .show_starget_port_id = 1,
205 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
206 .show_rport_dev_loss_tmo = 1,
207 .get_fc_host_stats = fc_get_host_stats,
208 .issue_fc_host_lip = fcoe_reset,
209
210 .terminate_rport_io = fc_rport_terminate_io,
211
212 .vport_create = fcoe_vport_create,
213 .vport_delete = fcoe_vport_destroy,
214 .vport_disable = fcoe_vport_disable,
215 .set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
216
217 .bsg_request = fc_lport_bsg_request,
218 };
219
220 static struct fc_function_template fcoe_vport_fc_functions = {
221 .show_host_node_name = 1,
222 .show_host_port_name = 1,
223 .show_host_supported_classes = 1,
224 .show_host_supported_fc4s = 1,
225 .show_host_active_fc4s = 1,
226 .show_host_maxframe_size = 1,
227 .show_host_serial_number = 1,
228 .show_host_manufacturer = 1,
229 .show_host_model = 1,
230 .show_host_model_description = 1,
231 .show_host_hardware_version = 1,
232 .show_host_driver_version = 1,
233 .show_host_firmware_version = 1,
234 .show_host_optionrom_version = 1,
235
236 .show_host_port_id = 1,
237 .show_host_supported_speeds = 1,
238 .get_host_speed = fc_get_host_speed,
239 .show_host_speed = 1,
240 .show_host_port_type = 1,
241 .get_host_port_state = fc_get_host_port_state,
242 .show_host_port_state = 1,
243 .show_host_symbolic_name = 1,
244
245 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
246 .show_rport_maxframe_size = 1,
247 .show_rport_supported_classes = 1,
248
249 .show_host_fabric_name = 1,
250 .show_starget_node_name = 1,
251 .show_starget_port_name = 1,
252 .show_starget_port_id = 1,
253 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
254 .show_rport_dev_loss_tmo = 1,
255 .get_fc_host_stats = fc_get_host_stats,
256 .issue_fc_host_lip = fcoe_reset,
257
258 .terminate_rport_io = fc_rport_terminate_io,
259
260 .bsg_request = fc_lport_bsg_request,
261 };
262
263 static const struct scsi_host_template fcoe_shost_template = {
264 .module = THIS_MODULE,
265 .name = "FCoE Driver",
266 .proc_name = FCOE_NAME,
267 .queuecommand = fc_queuecommand,
268 .eh_timed_out = fc_eh_timed_out,
269 .eh_abort_handler = fc_eh_abort,
270 .eh_device_reset_handler = fc_eh_device_reset,
271 .eh_host_reset_handler = fc_eh_host_reset,
272 .sdev_init = fc_sdev_init,
273 .change_queue_depth = scsi_change_queue_depth,
274 .this_id = -1,
275 .cmd_per_lun = 3,
276 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
277 .sg_tablesize = SG_ALL,
278 .max_sectors = 0xffff,
279 .track_queue_depth = 1,
280 .cmd_size = sizeof(struct libfc_cmd_priv),
281 };
282
283 /**
284 * fcoe_interface_setup() - Setup a FCoE interface
285 * @fcoe: The new FCoE interface
286 * @netdev: The net device that the fcoe interface is on
287 *
288 * Returns : 0 for success
289 * Locking: must be called with the RTNL mutex held
290 */
fcoe_interface_setup(struct fcoe_interface * fcoe,struct net_device * netdev)291 static int fcoe_interface_setup(struct fcoe_interface *fcoe,
292 struct net_device *netdev)
293 {
294 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
295 struct netdev_hw_addr *ha;
296 struct net_device *real_dev;
297 static const u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
298 const struct net_device_ops *ops;
299
300 fcoe->netdev = netdev;
301
302 /* Let LLD initialize for FCoE */
303 ops = netdev->netdev_ops;
304 if (ops->ndo_fcoe_enable) {
305 if (ops->ndo_fcoe_enable(netdev))
306 FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
307 " specific feature for LLD.\n");
308 }
309
310 /* Do not support for bonding device */
311 if (netif_is_bond_master(netdev)) {
312 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
313 return -EOPNOTSUPP;
314 }
315
316 /* look for SAN MAC address, if multiple SAN MACs exist, only
317 * use the first one for SPMA */
318 real_dev = is_vlan_dev(netdev) ? vlan_dev_real_dev(netdev) : netdev;
319 fcoe->realdev = real_dev;
320 rcu_read_lock();
321 for_each_dev_addr(real_dev, ha) {
322 if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
323 (is_valid_ether_addr(ha->addr))) {
324 memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
325 fip->spma = 1;
326 break;
327 }
328 }
329 rcu_read_unlock();
330
331 /* setup Source Mac Address */
332 if (!fip->spma)
333 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
334
335 /*
336 * Add FCoE MAC address as second unicast MAC address
337 * or enter promiscuous mode if not capable of listening
338 * for multiple unicast MACs.
339 */
340 dev_uc_add(netdev, flogi_maddr);
341 if (fip->spma)
342 dev_uc_add(netdev, fip->ctl_src_addr);
343 if (fip->mode == FIP_MODE_VN2VN) {
344 dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
345 dev_mc_add(netdev, FIP_ALL_P2P_MACS);
346 } else
347 dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
348
349 /*
350 * setup the receive function from ethernet driver
351 * on the ethertype for the given device
352 */
353 fcoe->fcoe_packet_type.func = fcoe_rcv;
354 fcoe->fcoe_packet_type.type = htons(ETH_P_FCOE);
355 fcoe->fcoe_packet_type.dev = netdev;
356 dev_add_pack(&fcoe->fcoe_packet_type);
357
358 fcoe->fip_packet_type.func = fcoe_fip_recv;
359 fcoe->fip_packet_type.type = htons(ETH_P_FIP);
360 fcoe->fip_packet_type.dev = netdev;
361 dev_add_pack(&fcoe->fip_packet_type);
362
363 if (netdev != real_dev) {
364 fcoe->fip_vlan_packet_type.func = fcoe_fip_vlan_recv;
365 fcoe->fip_vlan_packet_type.type = htons(ETH_P_FIP);
366 fcoe->fip_vlan_packet_type.dev = real_dev;
367 dev_add_pack(&fcoe->fip_vlan_packet_type);
368 }
369 return 0;
370 }
371
372 /**
373 * fcoe_interface_create() - Create a FCoE interface on a net device
374 * @netdev: The net device to create the FCoE interface on
375 * @fip_mode: The mode to use for FIP
376 *
377 * Returns: pointer to a struct fcoe_interface or NULL on error
378 */
fcoe_interface_create(struct net_device * netdev,enum fip_mode fip_mode)379 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
380 enum fip_mode fip_mode)
381 {
382 struct fcoe_ctlr_device *ctlr_dev;
383 struct fcoe_ctlr *ctlr;
384 struct fcoe_interface *fcoe;
385 int size;
386 int err;
387
388 if (!try_module_get(THIS_MODULE)) {
389 FCOE_NETDEV_DBG(netdev,
390 "Could not get a reference to the module\n");
391 fcoe = ERR_PTR(-EBUSY);
392 goto out;
393 }
394
395 size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface);
396 ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ,
397 size);
398 if (!ctlr_dev) {
399 FCOE_DBG("Failed to add fcoe_ctlr_device\n");
400 fcoe = ERR_PTR(-ENOMEM);
401 goto out_putmod;
402 }
403
404 ctlr = fcoe_ctlr_device_priv(ctlr_dev);
405 ctlr->cdev = ctlr_dev;
406 fcoe = fcoe_ctlr_priv(ctlr);
407
408 dev_hold(netdev);
409
410 /*
411 * Initialize FIP.
412 */
413 fcoe_ctlr_init(ctlr, fip_mode);
414 ctlr->send = fcoe_fip_send;
415 ctlr->update_mac = fcoe_update_src_mac;
416 ctlr->get_src_addr = fcoe_get_src_mac;
417
418 err = fcoe_interface_setup(fcoe, netdev);
419 if (err) {
420 fcoe_ctlr_destroy(ctlr);
421 fcoe_ctlr_device_delete(ctlr_dev);
422 dev_put(netdev);
423 fcoe = ERR_PTR(err);
424 goto out_putmod;
425 }
426
427 goto out;
428
429 out_putmod:
430 module_put(THIS_MODULE);
431 out:
432 return fcoe;
433 }
434
435 /**
436 * fcoe_interface_remove() - remove FCoE interface from netdev
437 * @fcoe: The FCoE interface to be cleaned up
438 *
439 * Caller must be holding the RTNL mutex
440 */
fcoe_interface_remove(struct fcoe_interface * fcoe)441 static void fcoe_interface_remove(struct fcoe_interface *fcoe)
442 {
443 struct net_device *netdev = fcoe->netdev;
444 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
445 static const u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
446 const struct net_device_ops *ops;
447
448 /*
449 * Don't listen for Ethernet packets anymore.
450 * synchronize_net() ensures that the packet handlers are not running
451 * on another CPU. dev_remove_pack() would do that, this calls the
452 * unsyncronized version __dev_remove_pack() to avoid multiple delays.
453 */
454 __dev_remove_pack(&fcoe->fcoe_packet_type);
455 __dev_remove_pack(&fcoe->fip_packet_type);
456 if (netdev != fcoe->realdev)
457 __dev_remove_pack(&fcoe->fip_vlan_packet_type);
458 synchronize_net();
459
460 /* Delete secondary MAC addresses */
461 dev_uc_del(netdev, flogi_maddr);
462 if (fip->spma)
463 dev_uc_del(netdev, fip->ctl_src_addr);
464 if (fip->mode == FIP_MODE_VN2VN) {
465 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
466 dev_mc_del(netdev, FIP_ALL_P2P_MACS);
467 } else
468 dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
469
470 /* Tell the LLD we are done w/ FCoE */
471 ops = netdev->netdev_ops;
472 if (ops->ndo_fcoe_disable) {
473 if (ops->ndo_fcoe_disable(netdev))
474 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
475 " specific feature for LLD.\n");
476 }
477 fcoe->removed = 1;
478 }
479
480
481 /**
482 * fcoe_interface_cleanup() - Clean up a FCoE interface
483 * @fcoe: The FCoE interface to be cleaned up
484 */
fcoe_interface_cleanup(struct fcoe_interface * fcoe)485 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
486 {
487 struct net_device *netdev = fcoe->netdev;
488 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
489
490 /* Release the self-reference taken during fcoe_interface_create() */
491 /* tear-down the FCoE controller */
492 fcoe_ctlr_destroy(fip);
493 scsi_host_put(fip->lp->host);
494 dev_put(netdev);
495 module_put(THIS_MODULE);
496 }
497
498 /**
499 * fcoe_fip_recv() - Handler for received FIP frames
500 * @skb: The receive skb
501 * @netdev: The associated net device
502 * @ptype: The packet_type structure which was used to register this handler
503 * @orig_dev: The original net_device the skb was received on.
504 * (in case dev is a bond)
505 *
506 * Returns: 0 for success
507 */
fcoe_fip_recv(struct sk_buff * skb,struct net_device * netdev,struct packet_type * ptype,struct net_device * orig_dev)508 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
509 struct packet_type *ptype,
510 struct net_device *orig_dev)
511 {
512 struct fcoe_interface *fcoe;
513 struct fcoe_ctlr *ctlr;
514
515 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
516 ctlr = fcoe_to_ctlr(fcoe);
517 fcoe_ctlr_recv(ctlr, skb);
518 return 0;
519 }
520
521 /**
522 * fcoe_fip_vlan_recv() - Handler for received FIP VLAN discovery frames
523 * @skb: The receive skb
524 * @netdev: The associated net device
525 * @ptype: The packet_type structure which was used to register this handler
526 * @orig_dev: The original net_device the skb was received on.
527 * (in case dev is a bond)
528 *
529 * Returns: 0 for success
530 */
fcoe_fip_vlan_recv(struct sk_buff * skb,struct net_device * netdev,struct packet_type * ptype,struct net_device * orig_dev)531 static int fcoe_fip_vlan_recv(struct sk_buff *skb, struct net_device *netdev,
532 struct packet_type *ptype,
533 struct net_device *orig_dev)
534 {
535 struct fcoe_interface *fcoe;
536 struct fcoe_ctlr *ctlr;
537
538 fcoe = container_of(ptype, struct fcoe_interface, fip_vlan_packet_type);
539 ctlr = fcoe_to_ctlr(fcoe);
540 fcoe_ctlr_recv(ctlr, skb);
541 return 0;
542 }
543
544 /**
545 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame
546 * @port: The FCoE port
547 * @skb: The FIP/FCoE packet to be sent
548 */
fcoe_port_send(struct fcoe_port * port,struct sk_buff * skb)549 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb)
550 {
551 if (port->fcoe_pending_queue.qlen)
552 fcoe_check_wait_queue(port->lport, skb);
553 else if (fcoe_start_io(skb))
554 fcoe_check_wait_queue(port->lport, skb);
555 }
556
557 /**
558 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
559 * @fip: The FCoE controller
560 * @skb: The FIP packet to be sent
561 */
fcoe_fip_send(struct fcoe_ctlr * fip,struct sk_buff * skb)562 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
563 {
564 struct fcoe_interface *fcoe = fcoe_from_ctlr(fip);
565 struct fip_frame {
566 struct ethhdr eth;
567 struct fip_header fip;
568 } __packed *frame;
569
570 /*
571 * Use default VLAN for FIP VLAN discovery protocol
572 */
573 frame = (struct fip_frame *)skb->data;
574 if (ntohs(frame->eth.h_proto) == ETH_P_FIP &&
575 ntohs(frame->fip.fip_op) == FIP_OP_VLAN &&
576 fcoe->realdev != fcoe->netdev)
577 skb->dev = fcoe->realdev;
578 else
579 skb->dev = fcoe->netdev;
580 fcoe_port_send(lport_priv(fip->lp), skb);
581 }
582
583 /**
584 * fcoe_update_src_mac() - Update the Ethernet MAC filters
585 * @lport: The local port to update the source MAC on
586 * @addr: Unicast MAC address to add
587 *
588 * Remove any previously-set unicast MAC filter.
589 * Add secondary FCoE MAC address filter for our OUI.
590 */
fcoe_update_src_mac(struct fc_lport * lport,u8 * addr)591 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
592 {
593 struct fcoe_port *port = lport_priv(lport);
594 struct fcoe_interface *fcoe = port->priv;
595
596 if (!is_zero_ether_addr(port->data_src_addr))
597 dev_uc_del(fcoe->netdev, port->data_src_addr);
598 if (!is_zero_ether_addr(addr))
599 dev_uc_add(fcoe->netdev, addr);
600 memcpy(port->data_src_addr, addr, ETH_ALEN);
601 }
602
603 /**
604 * fcoe_get_src_mac() - return the Ethernet source address for an lport
605 * @lport: libfc lport
606 */
fcoe_get_src_mac(struct fc_lport * lport)607 static u8 *fcoe_get_src_mac(struct fc_lport *lport)
608 {
609 struct fcoe_port *port = lport_priv(lport);
610
611 return port->data_src_addr;
612 }
613
614 /**
615 * fcoe_lport_config() - Set up a local port
616 * @lport: The local port to be setup
617 *
618 * Returns: 0 for success
619 */
fcoe_lport_config(struct fc_lport * lport)620 static int fcoe_lport_config(struct fc_lport *lport)
621 {
622 lport->link_up = 0;
623 lport->qfull = 0;
624 lport->max_retry_count = 3;
625 lport->max_rport_retry_count = 3;
626 lport->e_d_tov = fcoe_e_d_tov;
627 lport->r_a_tov = fcoe_r_a_tov;
628 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
629 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
630 lport->does_npiv = 1;
631
632 fc_lport_init_stats(lport);
633
634 /* lport fc_lport related configuration */
635 fc_lport_config(lport);
636
637 /* offload related configuration */
638 lport->crc_offload = 0;
639 lport->seq_offload = 0;
640 lport->lro_enabled = 0;
641 lport->lro_xid = 0;
642 lport->lso_max = 0;
643
644 return 0;
645 }
646
647 /*
648 * fcoe_netdev_features_change - Updates the lport's offload flags based
649 * on the LLD netdev's FCoE feature flags
650 */
fcoe_netdev_features_change(struct fc_lport * lport,struct net_device * netdev)651 static void fcoe_netdev_features_change(struct fc_lport *lport,
652 struct net_device *netdev)
653 {
654 mutex_lock(&lport->lp_mutex);
655
656 if (netdev->features & NETIF_F_SG)
657 lport->sg_supp = 1;
658 else
659 lport->sg_supp = 0;
660
661 if (netdev->features & NETIF_F_FCOE_CRC) {
662 lport->crc_offload = 1;
663 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
664 } else {
665 lport->crc_offload = 0;
666 }
667
668 if (netdev->features & NETIF_F_FSO) {
669 lport->seq_offload = 1;
670 lport->lso_max = min(netdev->gso_max_size, GSO_LEGACY_MAX_SIZE);
671 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
672 lport->lso_max);
673 } else {
674 lport->seq_offload = 0;
675 lport->lso_max = 0;
676 }
677
678 if (netdev->fcoe_ddp_xid) {
679 lport->lro_enabled = 1;
680 lport->lro_xid = netdev->fcoe_ddp_xid;
681 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
682 lport->lro_xid);
683 } else {
684 lport->lro_enabled = 0;
685 lport->lro_xid = 0;
686 }
687
688 mutex_unlock(&lport->lp_mutex);
689 }
690
691 /**
692 * fcoe_netdev_config() - Set up net devive for SW FCoE
693 * @lport: The local port that is associated with the net device
694 * @netdev: The associated net device
695 *
696 * Must be called after fcoe_lport_config() as it will use local port mutex
697 *
698 * Returns: 0 for success
699 */
fcoe_netdev_config(struct fc_lport * lport,struct net_device * netdev)700 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
701 {
702 u32 mfs;
703 u64 wwnn, wwpn;
704 struct fcoe_interface *fcoe;
705 struct fcoe_ctlr *ctlr;
706 struct fcoe_port *port;
707
708 /* Setup lport private data to point to fcoe softc */
709 port = lport_priv(lport);
710 fcoe = port->priv;
711 ctlr = fcoe_to_ctlr(fcoe);
712
713 /* Figure out the VLAN ID, if any */
714 if (is_vlan_dev(netdev))
715 lport->vlan = vlan_dev_vlan_id(netdev);
716 else
717 lport->vlan = 0;
718
719 /*
720 * Determine max frame size based on underlying device and optional
721 * user-configured limit. If the MFS is too low, fcoe_link_ok()
722 * will return 0, so do this first.
723 */
724 mfs = netdev->mtu;
725 if (netdev->fcoe_mtu) {
726 mfs = FCOE_MTU;
727 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
728 }
729 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
730 if (fc_set_mfs(lport, mfs))
731 return -EINVAL;
732
733 /* offload features support */
734 fcoe_netdev_features_change(lport, netdev);
735
736 skb_queue_head_init(&port->fcoe_pending_queue);
737 port->fcoe_pending_queue_active = 0;
738 timer_setup(&port->timer, fcoe_queue_timer, 0);
739
740 fcoe_link_speed_update(lport);
741
742 if (!lport->vport) {
743 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
744 wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0);
745 fc_set_wwnn(lport, wwnn);
746 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
747 wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr,
748 2, 0);
749 fc_set_wwpn(lport, wwpn);
750 }
751
752 return 0;
753 }
754
755 /**
756 * fcoe_shost_config() - Set up the SCSI host associated with a local port
757 * @lport: The local port
758 * @dev: The device associated with the SCSI host
759 *
760 * Must be called after fcoe_lport_config() and fcoe_netdev_config()
761 *
762 * Returns: 0 for success
763 */
fcoe_shost_config(struct fc_lport * lport,struct device * dev)764 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
765 {
766 int rc = 0;
767
768 /* lport scsi host config */
769 lport->host->max_lun = FCOE_MAX_LUN;
770 lport->host->max_id = FCOE_MAX_FCP_TARGET;
771 lport->host->max_channel = 0;
772 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
773
774 if (lport->vport)
775 lport->host->transportt = fcoe_vport_scsi_transport;
776 else
777 lport->host->transportt = fcoe_nport_scsi_transport;
778
779 /* add the new host to the SCSI-ml */
780 rc = scsi_add_host(lport->host, dev);
781 if (rc) {
782 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
783 "error on scsi_add_host\n");
784 return rc;
785 }
786
787 if (!lport->vport)
788 fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
789
790 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
791 "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
792 fcoe_netdev(lport)->name);
793
794 return 0;
795 }
796
797
798 /**
799 * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE
800 * @lport: The local port that is associated with the net device
801 * @netdev: The associated net device
802 *
803 * Must be called after fcoe_shost_config() as it will use local port mutex
804 *
805 */
fcoe_fdmi_info(struct fc_lport * lport,struct net_device * netdev)806 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
807 {
808 struct fcoe_interface *fcoe;
809 struct fcoe_port *port;
810 struct net_device *realdev;
811 int rc;
812
813 port = lport_priv(lport);
814 fcoe = port->priv;
815 realdev = fcoe->realdev;
816
817 /* No FDMI state m/c for NPIV ports */
818 if (lport->vport)
819 return;
820
821 if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) {
822 struct netdev_fcoe_hbainfo *fdmi;
823 fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL);
824 if (!fdmi)
825 return;
826
827 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev,
828 fdmi);
829 if (rc) {
830 printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
831 "information from netdev.\n");
832 return;
833 }
834
835 snprintf(fc_host_serial_number(lport->host),
836 FC_SERIAL_NUMBER_SIZE,
837 "%s",
838 fdmi->serial_number);
839 snprintf(fc_host_manufacturer(lport->host),
840 FC_SERIAL_NUMBER_SIZE,
841 "%s",
842 fdmi->manufacturer);
843 snprintf(fc_host_model(lport->host),
844 FC_SYMBOLIC_NAME_SIZE,
845 "%s",
846 fdmi->model);
847 snprintf(fc_host_model_description(lport->host),
848 FC_SYMBOLIC_NAME_SIZE,
849 "%s",
850 fdmi->model_description);
851 snprintf(fc_host_hardware_version(lport->host),
852 FC_VERSION_STRING_SIZE,
853 "%s",
854 fdmi->hardware_version);
855 snprintf(fc_host_driver_version(lport->host),
856 FC_VERSION_STRING_SIZE,
857 "%s",
858 fdmi->driver_version);
859 snprintf(fc_host_optionrom_version(lport->host),
860 FC_VERSION_STRING_SIZE,
861 "%s",
862 fdmi->optionrom_version);
863 snprintf(fc_host_firmware_version(lport->host),
864 FC_VERSION_STRING_SIZE,
865 "%s",
866 fdmi->firmware_version);
867
868 /* Enable FDMI lport states */
869 lport->fdmi_enabled = 1;
870 kfree(fdmi);
871 } else {
872 lport->fdmi_enabled = 0;
873 printk(KERN_INFO "fcoe: No FDMI support.\n");
874 }
875 }
876
877 /**
878 * fcoe_oem_match() - The match routine for the offloaded exchange manager
879 * @fp: The I/O frame
880 *
881 * This routine will be associated with an exchange manager (EM). When
882 * the libfc exchange handling code is looking for an EM to use it will
883 * call this routine and pass it the frame that it wishes to send. This
884 * routine will return True if the associated EM is to be used and False
885 * if the echange code should continue looking for an EM.
886 *
887 * The offload EM that this routine is associated with will handle any
888 * packets that are for SCSI read requests.
889 *
890 * This has been enhanced to work when FCoE stack is operating in target
891 * mode.
892 *
893 * Returns: True for read types I/O, otherwise returns false.
894 */
fcoe_oem_match(struct fc_frame * fp)895 static bool fcoe_oem_match(struct fc_frame *fp)
896 {
897 struct fc_frame_header *fh = fc_frame_header_get(fp);
898 struct fcp_cmnd *fcp;
899
900 if (fc_fcp_is_read(fr_fsp(fp)) &&
901 (fr_fsp(fp)->data_len > fcoe_ddp_min))
902 return true;
903 else if ((fr_fsp(fp) == NULL) &&
904 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) &&
905 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) {
906 fcp = fc_frame_payload_get(fp, sizeof(*fcp));
907 if ((fcp->fc_flags & FCP_CFL_WRDATA) &&
908 (ntohl(fcp->fc_dl) > fcoe_ddp_min))
909 return true;
910 }
911 return false;
912 }
913
914 /**
915 * fcoe_em_config() - Allocate and configure an exchange manager
916 * @lport: The local port that the new EM will be associated with
917 *
918 * Returns: 0 on success
919 */
fcoe_em_config(struct fc_lport * lport)920 static inline int fcoe_em_config(struct fc_lport *lport)
921 {
922 struct fcoe_port *port = lport_priv(lport);
923 struct fcoe_interface *fcoe = port->priv;
924 struct fcoe_interface *oldfcoe = NULL;
925 struct net_device *old_real_dev, *cur_real_dev;
926 u16 min_xid = FCOE_MIN_XID;
927 u16 max_xid = FCOE_MAX_XID;
928
929 /*
930 * Check if need to allocate an em instance for
931 * offload exchange ids to be shared across all VN_PORTs/lport.
932 */
933 if (!lport->lro_enabled || !lport->lro_xid ||
934 (lport->lro_xid >= max_xid)) {
935 lport->lro_xid = 0;
936 goto skip_oem;
937 }
938
939 /*
940 * Reuse existing offload em instance in case
941 * it is already allocated on real eth device
942 */
943 if (is_vlan_dev(fcoe->netdev))
944 cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
945 else
946 cur_real_dev = fcoe->netdev;
947
948 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
949 if (is_vlan_dev(oldfcoe->netdev))
950 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
951 else
952 old_real_dev = oldfcoe->netdev;
953
954 if (cur_real_dev == old_real_dev) {
955 fcoe->oem = oldfcoe->oem;
956 break;
957 }
958 }
959
960 if (fcoe->oem) {
961 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
962 printk(KERN_ERR "fcoe_em_config: failed to add "
963 "offload em:%p on interface:%s\n",
964 fcoe->oem, fcoe->netdev->name);
965 return -ENOMEM;
966 }
967 } else {
968 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
969 FCOE_MIN_XID, lport->lro_xid,
970 fcoe_oem_match);
971 if (!fcoe->oem) {
972 printk(KERN_ERR "fcoe_em_config: failed to allocate "
973 "em for offload exches on interface:%s\n",
974 fcoe->netdev->name);
975 return -ENOMEM;
976 }
977 }
978
979 /*
980 * Exclude offload EM xid range from next EM xid range.
981 */
982 min_xid += lport->lro_xid + 1;
983
984 skip_oem:
985 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
986 printk(KERN_ERR "fcoe_em_config: failed to "
987 "allocate em on interface %s\n", fcoe->netdev->name);
988 return -ENOMEM;
989 }
990
991 return 0;
992 }
993
994 /**
995 * fcoe_if_destroy() - Tear down a SW FCoE instance
996 * @lport: The local port to be destroyed
997 *
998 * Locking: Must be called with the RTNL mutex held.
999 *
1000 */
fcoe_if_destroy(struct fc_lport * lport)1001 static void fcoe_if_destroy(struct fc_lport *lport)
1002 {
1003 struct fcoe_port *port = lport_priv(lport);
1004 struct fcoe_interface *fcoe = port->priv;
1005 struct net_device *netdev = fcoe->netdev;
1006
1007 FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
1008
1009 /* Logout of the fabric */
1010 fc_fabric_logoff(lport);
1011
1012 /* Cleanup the fc_lport */
1013 fc_lport_destroy(lport);
1014
1015 /* Stop the transmit retry timer */
1016 timer_delete_sync(&port->timer);
1017
1018 /* Free existing transmit skbs */
1019 fcoe_clean_pending_queue(lport);
1020
1021 if (!is_zero_ether_addr(port->data_src_addr))
1022 dev_uc_del(netdev, port->data_src_addr);
1023 if (lport->vport)
1024 synchronize_net();
1025 else
1026 fcoe_interface_remove(fcoe);
1027
1028 /* Free queued packets for the per-CPU receive threads */
1029 fcoe_percpu_clean(lport);
1030
1031 /* Detach from the scsi-ml */
1032 fc_remove_host(lport->host);
1033 scsi_remove_host(lport->host);
1034
1035 /* Destroy lport scsi_priv */
1036 fc_fcp_destroy(lport);
1037
1038 /* There are no more rports or I/O, free the EM */
1039 fc_exch_mgr_free(lport);
1040
1041 /* Free memory used by statistical counters */
1042 fc_lport_free_stats(lport);
1043
1044 /*
1045 * Release the Scsi_Host for vport but hold on to
1046 * master lport until it fcoe interface fully cleaned-up.
1047 */
1048 if (lport->vport)
1049 scsi_host_put(lport->host);
1050 }
1051
1052 /**
1053 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
1054 * @lport: The local port to setup DDP for
1055 * @xid: The exchange ID for this DDP transfer
1056 * @sgl: The scatterlist describing this transfer
1057 * @sgc: The number of sg items
1058 *
1059 * Returns: 0 if the DDP context was not configured
1060 */
fcoe_ddp_setup(struct fc_lport * lport,u16 xid,struct scatterlist * sgl,unsigned int sgc)1061 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
1062 struct scatterlist *sgl, unsigned int sgc)
1063 {
1064 struct net_device *netdev = fcoe_netdev(lport);
1065
1066 if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
1067 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
1068 xid, sgl,
1069 sgc);
1070
1071 return 0;
1072 }
1073
1074 /**
1075 * fcoe_ddp_target() - Call a LLD's ddp_target through the net device
1076 * @lport: The local port to setup DDP for
1077 * @xid: The exchange ID for this DDP transfer
1078 * @sgl: The scatterlist describing this transfer
1079 * @sgc: The number of sg items
1080 *
1081 * Returns: 0 if the DDP context was not configured
1082 */
fcoe_ddp_target(struct fc_lport * lport,u16 xid,struct scatterlist * sgl,unsigned int sgc)1083 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid,
1084 struct scatterlist *sgl, unsigned int sgc)
1085 {
1086 struct net_device *netdev = fcoe_netdev(lport);
1087
1088 if (netdev->netdev_ops->ndo_fcoe_ddp_target)
1089 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid,
1090 sgl, sgc);
1091
1092 return 0;
1093 }
1094
1095
1096 /**
1097 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
1098 * @lport: The local port to complete DDP on
1099 * @xid: The exchange ID for this DDP transfer
1100 *
1101 * Returns: the length of data that have been completed by DDP
1102 */
fcoe_ddp_done(struct fc_lport * lport,u16 xid)1103 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
1104 {
1105 struct net_device *netdev = fcoe_netdev(lport);
1106
1107 if (netdev->netdev_ops->ndo_fcoe_ddp_done)
1108 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
1109 return 0;
1110 }
1111
1112 /**
1113 * fcoe_if_create() - Create a FCoE instance on an interface
1114 * @fcoe: The FCoE interface to create a local port on
1115 * @parent: The device pointer to be the parent in sysfs for the SCSI host
1116 * @npiv: Indicates if the port is a vport or not
1117 *
1118 * Creates a fc_lport instance and a Scsi_Host instance and configure them.
1119 *
1120 * Returns: The allocated fc_lport or an error pointer
1121 */
fcoe_if_create(struct fcoe_interface * fcoe,struct device * parent,int npiv)1122 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
1123 struct device *parent, int npiv)
1124 {
1125 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1126 struct net_device *netdev = fcoe->netdev;
1127 struct fc_lport *lport, *n_port;
1128 struct fcoe_port *port;
1129 struct Scsi_Host *shost;
1130 int rc;
1131 /*
1132 * parent is only a vport if npiv is 1,
1133 * but we'll only use vport in that case so go ahead and set it
1134 */
1135 struct fc_vport *vport = dev_to_vport(parent);
1136
1137 FCOE_NETDEV_DBG(netdev, "Create Interface\n");
1138
1139 if (!npiv)
1140 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port));
1141 else
1142 lport = libfc_vport_create(vport, sizeof(*port));
1143
1144 if (!lport) {
1145 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
1146 rc = -ENOMEM;
1147 goto out;
1148 }
1149 port = lport_priv(lport);
1150 port->lport = lport;
1151 port->priv = fcoe;
1152 port->get_netdev = fcoe_netdev;
1153 port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
1154 port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
1155 INIT_WORK(&port->destroy_work, fcoe_destroy_work);
1156
1157 /*
1158 * Need to add the lport to the hostlist
1159 * so we catch NETDEV_CHANGE events.
1160 */
1161 fcoe_hostlist_add(lport);
1162
1163 /* configure a fc_lport including the exchange manager */
1164 rc = fcoe_lport_config(lport);
1165 if (rc) {
1166 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
1167 "interface\n");
1168 goto out_host_put;
1169 }
1170
1171 if (npiv) {
1172 FCOE_NETDEV_DBG(netdev, "Setting vport names, "
1173 "%16.16llx %16.16llx\n",
1174 vport->node_name, vport->port_name);
1175 fc_set_wwnn(lport, vport->node_name);
1176 fc_set_wwpn(lport, vport->port_name);
1177 }
1178
1179 /* configure lport network properties */
1180 rc = fcoe_netdev_config(lport, netdev);
1181 if (rc) {
1182 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
1183 "interface\n");
1184 goto out_lp_destroy;
1185 }
1186
1187 /* configure lport scsi host properties */
1188 rc = fcoe_shost_config(lport, parent);
1189 if (rc) {
1190 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
1191 "interface\n");
1192 goto out_lp_destroy;
1193 }
1194
1195 /* Initialize the library */
1196 rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1);
1197 if (rc) {
1198 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
1199 "interface\n");
1200 goto out_lp_destroy;
1201 }
1202
1203 /* Initialized FDMI information */
1204 fcoe_fdmi_info(lport, netdev);
1205
1206 /*
1207 * fcoe_em_alloc() and fcoe_hostlist_add() both
1208 * need to be atomic with respect to other changes to the
1209 * hostlist since fcoe_em_alloc() looks for an existing EM
1210 * instance on host list updated by fcoe_hostlist_add().
1211 *
1212 * This is currently handled through the fcoe_config_mutex
1213 * begin held.
1214 */
1215 if (!npiv)
1216 /* lport exch manager allocation */
1217 rc = fcoe_em_config(lport);
1218 else {
1219 shost = vport_to_shost(vport);
1220 n_port = shost_priv(shost);
1221 rc = fc_exch_mgr_list_clone(n_port, lport);
1222 }
1223
1224 if (rc) {
1225 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n");
1226 goto out_lp_destroy;
1227 }
1228
1229 return lport;
1230
1231 out_lp_destroy:
1232 fc_exch_mgr_free(lport);
1233 out_host_put:
1234 fcoe_hostlist_del(lport);
1235 scsi_host_put(lport->host);
1236 out:
1237 return ERR_PTR(rc);
1238 }
1239
1240 /**
1241 * fcoe_if_init() - Initialization routine for fcoe.ko
1242 *
1243 * Attaches the SW FCoE transport to the FC transport
1244 *
1245 * Returns: 0 on success
1246 */
fcoe_if_init(void)1247 static int __init fcoe_if_init(void)
1248 {
1249 /* attach to scsi transport */
1250 fcoe_nport_scsi_transport =
1251 fc_attach_transport(&fcoe_nport_fc_functions);
1252 if (!fcoe_nport_scsi_transport)
1253 goto err;
1254
1255 fcoe_vport_scsi_transport =
1256 fc_attach_transport(&fcoe_vport_fc_functions);
1257 if (!fcoe_vport_scsi_transport)
1258 goto err_vport;
1259
1260 return 0;
1261
1262 err_vport:
1263 fc_release_transport(fcoe_nport_scsi_transport);
1264 err:
1265 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
1266 return -ENODEV;
1267 }
1268
1269 /**
1270 * fcoe_if_exit() - Tear down fcoe.ko
1271 *
1272 * Detaches the SW FCoE transport from the FC transport
1273 *
1274 * Returns: 0 on success
1275 */
fcoe_if_exit(void)1276 static int __exit fcoe_if_exit(void)
1277 {
1278 fc_release_transport(fcoe_nport_scsi_transport);
1279 fc_release_transport(fcoe_vport_scsi_transport);
1280 fcoe_nport_scsi_transport = NULL;
1281 fcoe_vport_scsi_transport = NULL;
1282 return 0;
1283 }
1284
fcoe_thread_cleanup_local(unsigned int cpu)1285 static void fcoe_thread_cleanup_local(unsigned int cpu)
1286 {
1287 struct page *crc_eof;
1288 struct fcoe_percpu_s *p;
1289
1290 p = per_cpu_ptr(&fcoe_percpu, cpu);
1291 spin_lock_bh(&p->fcoe_rx_list.lock);
1292 crc_eof = p->crc_eof_page;
1293 p->crc_eof_page = NULL;
1294 p->crc_eof_offset = 0;
1295 spin_unlock_bh(&p->fcoe_rx_list.lock);
1296
1297 if (crc_eof)
1298 put_page(crc_eof);
1299 flush_work(&p->work);
1300 }
1301
1302 /**
1303 * fcoe_rcv() - Receive packets from a net device
1304 * @skb: The received packet
1305 * @netdev: The net device that the packet was received on
1306 * @ptype: The packet type context
1307 * @olddev: The last device net device
1308 *
1309 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
1310 * FC frame and passes the frame to libfc.
1311 *
1312 * Returns: 0 for success
1313 */
fcoe_rcv(struct sk_buff * skb,struct net_device * netdev,struct packet_type * ptype,struct net_device * olddev)1314 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
1315 struct packet_type *ptype, struct net_device *olddev)
1316 {
1317 struct fc_lport *lport;
1318 struct fcoe_rcv_info *fr;
1319 struct fcoe_ctlr *ctlr;
1320 struct fcoe_interface *fcoe;
1321 struct fc_frame_header *fh;
1322 struct fcoe_percpu_s *fps;
1323 struct ethhdr *eh;
1324 unsigned int cpu;
1325
1326 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
1327 ctlr = fcoe_to_ctlr(fcoe);
1328 lport = ctlr->lp;
1329 if (unlikely(!lport)) {
1330 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n");
1331 goto err2;
1332 }
1333 if (!lport->link_up)
1334 goto err2;
1335
1336 FCOE_NETDEV_DBG(netdev,
1337 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1338 skb->len, skb->data_len, skb->head, skb->data,
1339 skb_tail_pointer(skb), skb_end_pointer(skb),
1340 skb->csum, skb->dev ? skb->dev->name : "<NULL>");
1341
1342
1343 skb = skb_share_check(skb, GFP_ATOMIC);
1344
1345 if (skb == NULL)
1346 return NET_RX_DROP;
1347
1348 eh = eth_hdr(skb);
1349
1350 if (is_fip_mode(ctlr) &&
1351 !ether_addr_equal(eh->h_source, ctlr->dest_addr)) {
1352 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
1353 eh->h_source);
1354 goto err;
1355 }
1356
1357 /*
1358 * Check for minimum frame length, and make sure required FCoE
1359 * and FC headers are pulled into the linear data area.
1360 */
1361 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
1362 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
1363 goto err;
1364
1365 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
1366 fh = (struct fc_frame_header *) skb_transport_header(skb);
1367
1368 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
1369 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
1370 eh->h_dest);
1371 goto err;
1372 }
1373
1374 fr = fcoe_dev_from_skb(skb);
1375 fr->fr_dev = lport;
1376
1377 /*
1378 * In case the incoming frame's exchange is originated from
1379 * the initiator, then received frame's exchange id is ANDed
1380 * with fc_cpu_mask bits to get the same cpu on which exchange
1381 * was originated, otherwise select cpu using rx exchange id
1382 * or fcoe_select_cpu().
1383 */
1384 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
1385 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
1386 else {
1387 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
1388 cpu = skb->alloc_cpu;
1389 else
1390 cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
1391 }
1392
1393 if (cpu >= nr_cpu_ids)
1394 goto err;
1395
1396 fps = &per_cpu(fcoe_percpu, cpu);
1397 spin_lock(&fps->fcoe_rx_list.lock);
1398 /*
1399 * We now have a valid CPU that we're targeting for
1400 * this skb. We also have this receive thread locked,
1401 * so we're free to queue skbs into it's queue.
1402 */
1403
1404 /*
1405 * Note: We used to have a set of conditions under which we would
1406 * call fcoe_recv_frame directly, rather than queuing to the rx list
1407 * as it could save a few cycles, but doing so is prohibited, as
1408 * fcoe_recv_frame has several paths that may sleep, which is forbidden
1409 * in softirq context.
1410 */
1411 __skb_queue_tail(&fps->fcoe_rx_list, skb);
1412 schedule_work_on(cpu, &fps->work);
1413 spin_unlock(&fps->fcoe_rx_list.lock);
1414
1415 return NET_RX_SUCCESS;
1416 err:
1417 this_cpu_inc(lport->stats->ErrorFrames);
1418 err2:
1419 kfree_skb(skb);
1420 return NET_RX_DROP;
1421 }
1422
1423 /**
1424 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC
1425 * @skb: The packet to be transmitted
1426 * @tlen: The total length of the trailer
1427 *
1428 * Returns: 0 for success
1429 */
fcoe_alloc_paged_crc_eof(struct sk_buff * skb,int tlen)1430 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
1431 {
1432 struct fcoe_percpu_s *fps;
1433 int rc;
1434
1435 local_lock(&fcoe_percpu.lock);
1436 fps = this_cpu_ptr(&fcoe_percpu);
1437 rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
1438 local_unlock(&fcoe_percpu.lock);
1439
1440 return rc;
1441 }
1442
1443 /**
1444 * fcoe_xmit() - Transmit a FCoE frame
1445 * @lport: The local port that the frame is to be transmitted for
1446 * @fp: The frame to be transmitted
1447 *
1448 * Return: 0 for success
1449 */
fcoe_xmit(struct fc_lport * lport,struct fc_frame * fp)1450 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
1451 {
1452 int wlen;
1453 u32 crc;
1454 struct ethhdr *eh;
1455 struct fcoe_crc_eof *cp;
1456 struct sk_buff *skb;
1457 struct fc_frame_header *fh;
1458 unsigned int hlen; /* header length implies the version */
1459 unsigned int tlen; /* trailer length */
1460 unsigned int elen; /* eth header, may include vlan */
1461 struct fcoe_port *port = lport_priv(lport);
1462 struct fcoe_interface *fcoe = port->priv;
1463 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1464 u8 sof, eof;
1465 struct fcoe_hdr *hp;
1466
1467 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1468
1469 fh = fc_frame_header_get(fp);
1470 skb = fp_skb(fp);
1471
1472 if (!lport->link_up) {
1473 kfree_skb(skb);
1474 return 0;
1475 }
1476
1477 if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
1478 fcoe_ctlr_els_send(ctlr, lport, skb))
1479 return 0;
1480
1481 sof = fr_sof(fp);
1482 eof = fr_eof(fp);
1483
1484 elen = sizeof(struct ethhdr);
1485 hlen = sizeof(struct fcoe_hdr);
1486 tlen = sizeof(struct fcoe_crc_eof);
1487 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1488
1489 /* crc offload */
1490 if (likely(lport->crc_offload)) {
1491 skb->ip_summed = CHECKSUM_PARTIAL;
1492 skb->csum_start = skb_headroom(skb);
1493 skb->csum_offset = skb->len;
1494 crc = 0;
1495 } else {
1496 skb->ip_summed = CHECKSUM_NONE;
1497 crc = fcoe_fc_crc(fp);
1498 }
1499
1500 /* copy port crc and eof to the skb buff */
1501 if (skb_is_nonlinear(skb)) {
1502 skb_frag_t *frag;
1503 if (fcoe_alloc_paged_crc_eof(skb, tlen)) {
1504 kfree_skb(skb);
1505 return -ENOMEM;
1506 }
1507 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1508 cp = kmap_atomic(skb_frag_page(frag)) + skb_frag_off(frag);
1509 } else {
1510 cp = skb_put(skb, tlen);
1511 }
1512
1513 memset(cp, 0, sizeof(*cp));
1514 cp->fcoe_eof = eof;
1515 cp->fcoe_crc32 = cpu_to_le32(~crc);
1516
1517 if (skb_is_nonlinear(skb)) {
1518 kunmap_atomic(cp);
1519 cp = NULL;
1520 }
1521
1522 /* adjust skb network/transport offsets to match mac/fcoe/port */
1523 skb_push(skb, elen + hlen);
1524 skb_reset_mac_header(skb);
1525 skb_reset_network_header(skb);
1526 skb->mac_len = elen;
1527 skb->protocol = htons(ETH_P_FCOE);
1528 skb->priority = fcoe->priority;
1529
1530 if (is_vlan_dev(fcoe->netdev) &&
1531 fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) {
1532 /* must set skb->dev before calling vlan_put_tag */
1533 skb->dev = fcoe->realdev;
1534 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1535 vlan_dev_vlan_id(fcoe->netdev));
1536 } else
1537 skb->dev = fcoe->netdev;
1538
1539 /* fill up mac and fcoe headers */
1540 eh = eth_hdr(skb);
1541 eh->h_proto = htons(ETH_P_FCOE);
1542 memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN);
1543 if (ctlr->map_dest)
1544 memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
1545
1546 if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN))
1547 memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN);
1548 else
1549 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
1550
1551 hp = (struct fcoe_hdr *)(eh + 1);
1552 memset(hp, 0, sizeof(*hp));
1553 if (FC_FCOE_VER)
1554 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1555 hp->fcoe_sof = sof;
1556
1557 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1558 if (lport->seq_offload && fr_max_payload(fp)) {
1559 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1560 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1561 } else {
1562 skb_shinfo(skb)->gso_type = 0;
1563 skb_shinfo(skb)->gso_size = 0;
1564 }
1565 /* update tx stats: regardless if LLD fails */
1566 this_cpu_inc(lport->stats->TxFrames);
1567 this_cpu_add(lport->stats->TxWords, wlen);
1568
1569 /* send down to lld */
1570 fr_dev(fp) = lport;
1571 fcoe_port_send(port, skb);
1572 return 0;
1573 }
1574
1575 /**
1576 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC
1577 * @lport: The local port the frame was received on
1578 * @fp: The received frame
1579 *
1580 * Return: 0 on passing filtering checks
1581 */
fcoe_filter_frames(struct fc_lport * lport,struct fc_frame * fp)1582 static inline int fcoe_filter_frames(struct fc_lport *lport,
1583 struct fc_frame *fp)
1584 {
1585 struct fcoe_ctlr *ctlr;
1586 struct fcoe_interface *fcoe;
1587 struct fc_frame_header *fh;
1588 struct sk_buff *skb = (struct sk_buff *)fp;
1589
1590 /*
1591 * We only check CRC if no offload is available and if it is
1592 * it's solicited data, in which case, the FCP layer would
1593 * check it during the copy.
1594 */
1595 if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1596 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1597 else
1598 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1599
1600 fh = fc_frame_header_get(fp);
1601 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
1602 return 0;
1603
1604 fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
1605 ctlr = fcoe_to_ctlr(fcoe);
1606 if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
1607 ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
1608 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
1609 return -EINVAL;
1610 }
1611
1612 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) ||
1613 le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) {
1614 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1615 return 0;
1616 }
1617
1618 if (this_cpu_inc_return(lport->stats->InvalidCRCCount) < 5)
1619 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
1620 return -EINVAL;
1621 }
1622
1623 /**
1624 * fcoe_recv_frame() - process a single received frame
1625 * @skb: frame to process
1626 */
fcoe_recv_frame(struct sk_buff * skb)1627 static void fcoe_recv_frame(struct sk_buff *skb)
1628 {
1629 u32 fr_len;
1630 struct fc_lport *lport;
1631 struct fcoe_rcv_info *fr;
1632 struct fcoe_crc_eof crc_eof;
1633 struct fc_frame *fp;
1634 struct fcoe_hdr *hp;
1635
1636 fr = fcoe_dev_from_skb(skb);
1637 lport = fr->fr_dev;
1638 if (unlikely(!lport)) {
1639 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n");
1640 kfree_skb(skb);
1641 return;
1642 }
1643
1644 FCOE_NETDEV_DBG(skb->dev,
1645 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1646 skb->len, skb->data_len,
1647 skb->head, skb->data, skb_tail_pointer(skb),
1648 skb_end_pointer(skb), skb->csum,
1649 skb->dev ? skb->dev->name : "<NULL>");
1650
1651 skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */
1652
1653 /*
1654 * Frame length checks and setting up the header pointers
1655 * was done in fcoe_rcv already.
1656 */
1657 hp = (struct fcoe_hdr *) skb_network_header(skb);
1658
1659 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1660 struct fc_stats *stats;
1661
1662 stats = per_cpu_ptr(lport->stats, raw_smp_processor_id());
1663 if (READ_ONCE(stats->ErrorFrames) < 5)
1664 printk(KERN_WARNING "fcoe: FCoE version "
1665 "mismatch: The frame has "
1666 "version %x, but the "
1667 "initiator supports version "
1668 "%x\n", FC_FCOE_DECAPS_VER(hp),
1669 FC_FCOE_VER);
1670 goto drop;
1671 }
1672
1673 skb_pull(skb, sizeof(struct fcoe_hdr));
1674 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1675
1676 this_cpu_inc(lport->stats->RxFrames);
1677 this_cpu_add(lport->stats->RxWords, fr_len / FCOE_WORD_TO_BYTE);
1678
1679 fp = (struct fc_frame *)skb;
1680 fc_frame_init(fp);
1681 fr_dev(fp) = lport;
1682 fr_sof(fp) = hp->fcoe_sof;
1683
1684 /* Copy out the CRC and EOF trailer for access */
1685 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
1686 goto drop;
1687 fr_eof(fp) = crc_eof.fcoe_eof;
1688 fr_crc(fp) = crc_eof.fcoe_crc32;
1689 if (pskb_trim(skb, fr_len))
1690 goto drop;
1691
1692 if (!fcoe_filter_frames(lport, fp)) {
1693 fc_exch_recv(lport, fp);
1694 return;
1695 }
1696 drop:
1697 this_cpu_inc(lport->stats->ErrorFrames);
1698 kfree_skb(skb);
1699 }
1700
1701 /**
1702 * fcoe_receive_work() - The per-CPU worker
1703 * @work: The work struct
1704 *
1705 */
fcoe_receive_work(struct work_struct * work)1706 static void fcoe_receive_work(struct work_struct *work)
1707 {
1708 struct fcoe_percpu_s *p;
1709 struct sk_buff *skb;
1710 struct sk_buff_head tmp;
1711
1712 p = container_of(work, struct fcoe_percpu_s, work);
1713 skb_queue_head_init(&tmp);
1714
1715 spin_lock_bh(&p->fcoe_rx_list.lock);
1716 skb_queue_splice_init(&p->fcoe_rx_list, &tmp);
1717 spin_unlock_bh(&p->fcoe_rx_list.lock);
1718
1719 if (!skb_queue_len(&tmp))
1720 return;
1721
1722 while ((skb = __skb_dequeue(&tmp)))
1723 fcoe_recv_frame(skb);
1724 }
1725
1726 /**
1727 * fcoe_dev_setup() - Setup the link change notification interface
1728 */
fcoe_dev_setup(void)1729 static void fcoe_dev_setup(void)
1730 {
1731 register_dcbevent_notifier(&dcb_notifier);
1732 register_netdevice_notifier(&fcoe_notifier);
1733 }
1734
1735 /**
1736 * fcoe_dev_cleanup() - Cleanup the link change notification interface
1737 */
fcoe_dev_cleanup(void)1738 static void fcoe_dev_cleanup(void)
1739 {
1740 unregister_dcbevent_notifier(&dcb_notifier);
1741 unregister_netdevice_notifier(&fcoe_notifier);
1742 }
1743
1744 static struct fcoe_interface *
fcoe_hostlist_lookup_realdev_port(struct net_device * netdev)1745 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev)
1746 {
1747 struct fcoe_interface *fcoe;
1748 struct net_device *real_dev;
1749
1750 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1751 if (is_vlan_dev(fcoe->netdev))
1752 real_dev = vlan_dev_real_dev(fcoe->netdev);
1753 else
1754 real_dev = fcoe->netdev;
1755
1756 if (netdev == real_dev)
1757 return fcoe;
1758 }
1759 return NULL;
1760 }
1761
fcoe_dcb_app_notification(struct notifier_block * notifier,ulong event,void * ptr)1762 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
1763 ulong event, void *ptr)
1764 {
1765 struct dcb_app_type *entry = ptr;
1766 struct fcoe_ctlr *ctlr;
1767 struct fcoe_interface *fcoe;
1768 struct net_device *netdev;
1769 int prio;
1770
1771 if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE)
1772 return NOTIFY_OK;
1773
1774 netdev = dev_get_by_index(&init_net, entry->ifindex);
1775 if (!netdev)
1776 return NOTIFY_OK;
1777
1778 fcoe = fcoe_hostlist_lookup_realdev_port(netdev);
1779 dev_put(netdev);
1780 if (!fcoe)
1781 return NOTIFY_OK;
1782
1783 ctlr = fcoe_to_ctlr(fcoe);
1784
1785 if (entry->dcbx & DCB_CAP_DCBX_VER_CEE)
1786 prio = ffs(entry->app.priority) - 1;
1787 else
1788 prio = entry->app.priority;
1789
1790 if (prio < 0)
1791 return NOTIFY_OK;
1792
1793 if (entry->app.protocol == ETH_P_FIP ||
1794 entry->app.protocol == ETH_P_FCOE)
1795 ctlr->priority = prio;
1796
1797 if (entry->app.protocol == ETH_P_FCOE)
1798 fcoe->priority = prio;
1799
1800 return NOTIFY_OK;
1801 }
1802
1803 /**
1804 * fcoe_device_notification() - Handler for net device events
1805 * @notifier: The context of the notification
1806 * @event: The type of event
1807 * @ptr: The net device that the event was on
1808 *
1809 * This function is called by the Ethernet driver in case of link change event.
1810 *
1811 * Returns: 0 for success
1812 */
fcoe_device_notification(struct notifier_block * notifier,ulong event,void * ptr)1813 static int fcoe_device_notification(struct notifier_block *notifier,
1814 ulong event, void *ptr)
1815 {
1816 struct fcoe_ctlr_device *cdev;
1817 struct fc_lport *lport = NULL;
1818 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1819 struct fcoe_ctlr *ctlr;
1820 struct fcoe_interface *fcoe;
1821 u32 link_possible = 1;
1822 u32 mfs;
1823 int rc = NOTIFY_OK;
1824
1825 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1826 if (fcoe->netdev == netdev) {
1827 ctlr = fcoe_to_ctlr(fcoe);
1828 lport = ctlr->lp;
1829 break;
1830 }
1831 }
1832 if (!lport) {
1833 rc = NOTIFY_DONE;
1834 goto out;
1835 }
1836
1837 switch (event) {
1838 case NETDEV_DOWN:
1839 case NETDEV_GOING_DOWN:
1840 link_possible = 0;
1841 break;
1842 case NETDEV_UP:
1843 case NETDEV_CHANGE:
1844 break;
1845 case NETDEV_CHANGEMTU:
1846 if (netdev->fcoe_mtu)
1847 break;
1848 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
1849 sizeof(struct fcoe_crc_eof));
1850 if (mfs >= FC_MIN_MAX_FRAME)
1851 fc_set_mfs(lport, mfs);
1852 break;
1853 case NETDEV_REGISTER:
1854 break;
1855 case NETDEV_UNREGISTER:
1856 list_del(&fcoe->list);
1857 fcoe_vport_remove(lport);
1858 mutex_lock(&fcoe_config_mutex);
1859 fcoe_if_destroy(lport);
1860 if (!fcoe->removed)
1861 fcoe_interface_remove(fcoe);
1862 fcoe_interface_cleanup(fcoe);
1863 mutex_unlock(&fcoe_config_mutex);
1864 fcoe_ctlr_device_delete(fcoe_ctlr_to_ctlr_dev(ctlr));
1865 goto out;
1866 case NETDEV_FEAT_CHANGE:
1867 fcoe_netdev_features_change(lport, netdev);
1868 break;
1869 default:
1870 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
1871 "from netdev netlink\n", event);
1872 }
1873
1874 fcoe_link_speed_update(lport);
1875
1876 cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
1877
1878 if (link_possible && !fcoe_link_ok(lport)) {
1879 switch (cdev->enabled) {
1880 case FCOE_CTLR_DISABLED:
1881 pr_info("Link up while interface is disabled.\n");
1882 break;
1883 case FCOE_CTLR_ENABLED:
1884 case FCOE_CTLR_UNUSED:
1885 fcoe_ctlr_link_up(ctlr);
1886 }
1887 } else if (fcoe_ctlr_link_down(ctlr)) {
1888 switch (cdev->enabled) {
1889 case FCOE_CTLR_DISABLED:
1890 pr_info("Link down while interface is disabled.\n");
1891 break;
1892 case FCOE_CTLR_ENABLED:
1893 case FCOE_CTLR_UNUSED:
1894 this_cpu_inc(lport->stats->LinkFailureCount);
1895 fcoe_clean_pending_queue(lport);
1896 }
1897 }
1898 out:
1899 return rc;
1900 }
1901
1902 /**
1903 * fcoe_disable() - Disables a FCoE interface
1904 * @netdev : The net_device object the Ethernet interface to create on
1905 *
1906 * Called from fcoe transport.
1907 *
1908 * Returns: 0 for success
1909 *
1910 * Deprecated: use fcoe_ctlr_enabled()
1911 */
fcoe_disable(struct net_device * netdev)1912 static int fcoe_disable(struct net_device *netdev)
1913 {
1914 struct fcoe_ctlr *ctlr;
1915 struct fcoe_interface *fcoe;
1916 int rc = 0;
1917
1918 mutex_lock(&fcoe_config_mutex);
1919
1920 rtnl_lock();
1921 fcoe = fcoe_hostlist_lookup_port(netdev);
1922 rtnl_unlock();
1923
1924 if (fcoe) {
1925 ctlr = fcoe_to_ctlr(fcoe);
1926 fcoe_ctlr_link_down(ctlr);
1927 fcoe_clean_pending_queue(ctlr->lp);
1928 } else
1929 rc = -ENODEV;
1930
1931 mutex_unlock(&fcoe_config_mutex);
1932 return rc;
1933 }
1934
1935 /**
1936 * fcoe_enable() - Enables a FCoE interface
1937 * @netdev : The net_device object the Ethernet interface to create on
1938 *
1939 * Called from fcoe transport.
1940 *
1941 * Returns: 0 for success
1942 */
fcoe_enable(struct net_device * netdev)1943 static int fcoe_enable(struct net_device *netdev)
1944 {
1945 struct fcoe_ctlr *ctlr;
1946 struct fcoe_interface *fcoe;
1947 int rc = 0;
1948
1949 mutex_lock(&fcoe_config_mutex);
1950 rtnl_lock();
1951 fcoe = fcoe_hostlist_lookup_port(netdev);
1952 rtnl_unlock();
1953
1954 if (!fcoe) {
1955 rc = -ENODEV;
1956 goto out;
1957 }
1958
1959 ctlr = fcoe_to_ctlr(fcoe);
1960
1961 if (!fcoe_link_ok(ctlr->lp))
1962 fcoe_ctlr_link_up(ctlr);
1963
1964 out:
1965 mutex_unlock(&fcoe_config_mutex);
1966 return rc;
1967 }
1968
1969 /**
1970 * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller
1971 * @cdev: The FCoE Controller that is being enabled or disabled
1972 *
1973 * fcoe_sysfs will ensure that the state of 'enabled' has
1974 * changed, so no checking is necessary here. This routine simply
1975 * calls fcoe_enable or fcoe_disable, both of which are deprecated.
1976 * When those routines are removed the functionality can be merged
1977 * here.
1978 */
fcoe_ctlr_enabled(struct fcoe_ctlr_device * cdev)1979 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
1980 {
1981 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev);
1982 struct fc_lport *lport = ctlr->lp;
1983 struct net_device *netdev = fcoe_netdev(lport);
1984
1985 switch (cdev->enabled) {
1986 case FCOE_CTLR_ENABLED:
1987 return fcoe_enable(netdev);
1988 case FCOE_CTLR_DISABLED:
1989 return fcoe_disable(netdev);
1990 case FCOE_CTLR_UNUSED:
1991 default:
1992 return -ENOTSUPP;
1993 }
1994 }
1995
1996 /**
1997 * fcoe_ctlr_mode() - Switch FIP mode
1998 * @ctlr_dev: The FCoE Controller that is being modified
1999 *
2000 * When the FIP mode has been changed we need to update
2001 * the multicast addresses to ensure we get the correct
2002 * frames.
2003 */
fcoe_ctlr_mode(struct fcoe_ctlr_device * ctlr_dev)2004 static void fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev)
2005 {
2006 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2007 struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2008
2009 if (ctlr_dev->mode == FIP_CONN_TYPE_VN2VN &&
2010 ctlr->mode != FIP_MODE_VN2VN) {
2011 dev_mc_del(fcoe->netdev, FIP_ALL_ENODE_MACS);
2012 dev_mc_add(fcoe->netdev, FIP_ALL_VN2VN_MACS);
2013 dev_mc_add(fcoe->netdev, FIP_ALL_P2P_MACS);
2014 } else if (ctlr->mode != FIP_MODE_FABRIC) {
2015 dev_mc_del(fcoe->netdev, FIP_ALL_VN2VN_MACS);
2016 dev_mc_del(fcoe->netdev, FIP_ALL_P2P_MACS);
2017 dev_mc_add(fcoe->netdev, FIP_ALL_ENODE_MACS);
2018 }
2019 fcoe_ctlr_set_fip_mode(ctlr_dev);
2020 }
2021
2022 /**
2023 * fcoe_destroy() - Destroy a FCoE interface
2024 * @netdev : The net_device object the Ethernet interface to create on
2025 *
2026 * Called from fcoe transport
2027 *
2028 * Returns: 0 for success
2029 */
fcoe_destroy(struct net_device * netdev)2030 static int fcoe_destroy(struct net_device *netdev)
2031 {
2032 struct fcoe_ctlr *ctlr;
2033 struct fcoe_interface *fcoe;
2034 struct fc_lport *lport;
2035 struct fcoe_port *port;
2036 int rc = 0;
2037
2038 mutex_lock(&fcoe_config_mutex);
2039 rtnl_lock();
2040 fcoe = fcoe_hostlist_lookup_port(netdev);
2041 if (!fcoe) {
2042 rc = -ENODEV;
2043 goto out_nodev;
2044 }
2045 ctlr = fcoe_to_ctlr(fcoe);
2046 lport = ctlr->lp;
2047 port = lport_priv(lport);
2048 list_del(&fcoe->list);
2049 queue_work(fcoe_wq, &port->destroy_work);
2050 out_nodev:
2051 rtnl_unlock();
2052 mutex_unlock(&fcoe_config_mutex);
2053 return rc;
2054 }
2055
2056 /**
2057 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
2058 * @work: Handle to the FCoE port to be destroyed
2059 */
fcoe_destroy_work(struct work_struct * work)2060 static void fcoe_destroy_work(struct work_struct *work)
2061 {
2062 struct fcoe_ctlr_device *cdev;
2063 struct fcoe_ctlr *ctlr;
2064 struct fcoe_port *port;
2065 struct fcoe_interface *fcoe;
2066
2067 port = container_of(work, struct fcoe_port, destroy_work);
2068
2069 fcoe_vport_remove(port->lport);
2070
2071 mutex_lock(&fcoe_config_mutex);
2072
2073 fcoe = port->priv;
2074 ctlr = fcoe_to_ctlr(fcoe);
2075 cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2076
2077 rtnl_lock();
2078 fcoe_if_destroy(port->lport);
2079 if (!fcoe->removed)
2080 fcoe_interface_remove(fcoe);
2081 rtnl_unlock();
2082 fcoe_interface_cleanup(fcoe);
2083
2084 mutex_unlock(&fcoe_config_mutex);
2085
2086 fcoe_ctlr_device_delete(cdev);
2087 }
2088
2089 /**
2090 * fcoe_match() - Check if the FCoE is supported on the given netdevice
2091 * @netdev : The net_device object the Ethernet interface to create on
2092 *
2093 * Called from fcoe transport.
2094 *
2095 * Returns: always returns true as this is the default FCoE transport,
2096 * i.e., support all netdevs.
2097 */
fcoe_match(struct net_device * netdev)2098 static bool fcoe_match(struct net_device *netdev)
2099 {
2100 return true;
2101 }
2102
2103 /**
2104 * fcoe_dcb_create() - Initialize DCB attributes and hooks
2105 * @fcoe: The new FCoE interface
2106 */
fcoe_dcb_create(struct fcoe_interface * fcoe)2107 static void fcoe_dcb_create(struct fcoe_interface *fcoe)
2108 {
2109 int ctlr_prio = TC_PRIO_BESTEFFORT;
2110 int fcoe_prio = TC_PRIO_INTERACTIVE;
2111 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2112 #ifdef CONFIG_DCB
2113 int dcbx;
2114 u8 fup, up;
2115 struct net_device *netdev = fcoe->realdev;
2116 struct dcb_app app = {
2117 .priority = 0,
2118 .protocol = ETH_P_FCOE
2119 };
2120
2121 /* setup DCB priority attributes. */
2122 if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) {
2123 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
2124
2125 if (dcbx & DCB_CAP_DCBX_VER_IEEE) {
2126 app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
2127 up = dcb_ieee_getapp_mask(netdev, &app);
2128 app.protocol = ETH_P_FIP;
2129 fup = dcb_ieee_getapp_mask(netdev, &app);
2130 } else {
2131 app.selector = DCB_APP_IDTYPE_ETHTYPE;
2132 up = dcb_getapp(netdev, &app);
2133 app.protocol = ETH_P_FIP;
2134 fup = dcb_getapp(netdev, &app);
2135 }
2136
2137 fcoe_prio = ffs(up) ? ffs(up) - 1 : 0;
2138 ctlr_prio = ffs(fup) ? ffs(fup) - 1 : fcoe_prio;
2139 }
2140 #endif
2141 fcoe->priority = fcoe_prio;
2142 ctlr->priority = ctlr_prio;
2143 }
2144
2145 enum fcoe_create_link_state {
2146 FCOE_CREATE_LINK_DOWN,
2147 FCOE_CREATE_LINK_UP,
2148 };
2149
2150 /**
2151 * _fcoe_create() - (internal) Create a fcoe interface
2152 * @netdev : The net_device object the Ethernet interface to create on
2153 * @fip_mode: The FIP mode for this creation
2154 * @link_state: The ctlr link state on creation
2155 *
2156 * Called from either the libfcoe 'create' module parameter
2157 * via fcoe_create or from fcoe_syfs's ctlr_create file.
2158 *
2159 * libfcoe's 'create' module parameter is deprecated so some
2160 * consolidation of code can be done when that interface is
2161 * removed.
2162 */
_fcoe_create(struct net_device * netdev,enum fip_mode fip_mode,enum fcoe_create_link_state link_state)2163 static int _fcoe_create(struct net_device *netdev, enum fip_mode fip_mode,
2164 enum fcoe_create_link_state link_state)
2165 {
2166 int rc = 0;
2167 struct fcoe_ctlr_device *ctlr_dev;
2168 struct fcoe_ctlr *ctlr;
2169 struct fcoe_interface *fcoe;
2170 struct fc_lport *lport;
2171
2172 mutex_lock(&fcoe_config_mutex);
2173 rtnl_lock();
2174
2175 /* look for existing lport */
2176 if (fcoe_hostlist_lookup(netdev)) {
2177 rc = -EEXIST;
2178 goto out_nodev;
2179 }
2180
2181 fcoe = fcoe_interface_create(netdev, fip_mode);
2182 if (IS_ERR(fcoe)) {
2183 rc = PTR_ERR(fcoe);
2184 goto out_nodev;
2185 }
2186
2187 ctlr = fcoe_to_ctlr(fcoe);
2188 ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr);
2189 lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0);
2190 if (IS_ERR(lport)) {
2191 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
2192 netdev->name);
2193 rc = -EIO;
2194 if (!fcoe->removed)
2195 fcoe_interface_remove(fcoe);
2196 rtnl_unlock();
2197 fcoe_interface_cleanup(fcoe);
2198 mutex_unlock(&fcoe_config_mutex);
2199 fcoe_ctlr_device_delete(ctlr_dev);
2200 return rc;
2201 }
2202
2203 /* Make this the "master" N_Port */
2204 ctlr->lp = lport;
2205
2206 /* setup DCB priority attributes. */
2207 fcoe_dcb_create(fcoe);
2208
2209 /* start FIP Discovery and FLOGI */
2210 lport->boot_time = jiffies;
2211 fc_fabric_login(lport);
2212
2213 /*
2214 * If the fcoe_ctlr_device is to be set to DISABLED
2215 * it must be done after the lport is added to the
2216 * hostlist, but before the rtnl_lock is released.
2217 * This is because the rtnl_lock protects the
2218 * hostlist that fcoe_device_notification uses. If
2219 * the FCoE Controller is intended to be created
2220 * DISABLED then 'enabled' needs to be considered
2221 * handling link events. 'enabled' must be set
2222 * before the lport can be found in the hostlist
2223 * when a link up event is received.
2224 */
2225 if (link_state == FCOE_CREATE_LINK_UP)
2226 ctlr_dev->enabled = FCOE_CTLR_ENABLED;
2227 else
2228 ctlr_dev->enabled = FCOE_CTLR_DISABLED;
2229
2230 if (link_state == FCOE_CREATE_LINK_UP &&
2231 !fcoe_link_ok(lport)) {
2232 rtnl_unlock();
2233 fcoe_ctlr_link_up(ctlr);
2234 mutex_unlock(&fcoe_config_mutex);
2235 return rc;
2236 }
2237
2238 out_nodev:
2239 rtnl_unlock();
2240 mutex_unlock(&fcoe_config_mutex);
2241
2242 return rc;
2243 }
2244
2245 /**
2246 * fcoe_create() - Create a fcoe interface
2247 * @netdev : The net_device object the Ethernet interface to create on
2248 * @fip_mode: The FIP mode for this creation
2249 *
2250 * Called from fcoe transport
2251 *
2252 * Returns: 0 for success
2253 */
fcoe_create(struct net_device * netdev,enum fip_mode fip_mode)2254 static int fcoe_create(struct net_device *netdev, enum fip_mode fip_mode)
2255 {
2256 return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
2257 }
2258
2259 /**
2260 * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs
2261 * @netdev: The net_device to be used by the allocated FCoE Controller
2262 *
2263 * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr
2264 * in a link_down state. The allows the user an opportunity to configure
2265 * the FCoE Controller from sysfs before enabling the FCoE Controller.
2266 *
2267 * Creating in with this routine starts the FCoE Controller in Fabric
2268 * mode. The user can change to VN2VN or another mode before enabling.
2269 */
fcoe_ctlr_alloc(struct net_device * netdev)2270 static int fcoe_ctlr_alloc(struct net_device *netdev)
2271 {
2272 return _fcoe_create(netdev, FIP_MODE_FABRIC,
2273 FCOE_CREATE_LINK_DOWN);
2274 }
2275
2276 /**
2277 * fcoe_link_ok() - Check if the link is OK for a local port
2278 * @lport: The local port to check link on
2279 *
2280 * Returns: 0 if link is UP and OK, -1 if not
2281 *
2282 */
fcoe_link_ok(struct fc_lport * lport)2283 static int fcoe_link_ok(struct fc_lport *lport)
2284 {
2285 struct net_device *netdev = fcoe_netdev(lport);
2286
2287 if (netif_oper_up(netdev))
2288 return 0;
2289 return -1;
2290 }
2291
2292 /**
2293 * fcoe_percpu_clean() - Clear all pending skbs for an local port
2294 * @lport: The local port whose skbs are to be cleared
2295 *
2296 * Must be called with fcoe_create_mutex held to single-thread completion.
2297 *
2298 * This flushes the pending skbs by flush the work item for each CPU. The work
2299 * item on each possible CPU is flushed because we may have used the per-CPU
2300 * struct of an offline CPU.
2301 */
fcoe_percpu_clean(struct fc_lport * lport)2302 static void fcoe_percpu_clean(struct fc_lport *lport)
2303 {
2304 struct fcoe_percpu_s *pp;
2305 unsigned int cpu;
2306
2307 for_each_possible_cpu(cpu) {
2308 pp = &per_cpu(fcoe_percpu, cpu);
2309
2310 flush_work(&pp->work);
2311 }
2312 }
2313
2314 /**
2315 * fcoe_reset() - Reset a local port
2316 * @shost: The SCSI host associated with the local port to be reset
2317 *
2318 * Returns: Always 0 (return value required by FC transport template)
2319 */
fcoe_reset(struct Scsi_Host * shost)2320 static int fcoe_reset(struct Scsi_Host *shost)
2321 {
2322 struct fc_lport *lport = shost_priv(shost);
2323 struct fcoe_port *port = lport_priv(lport);
2324 struct fcoe_interface *fcoe = port->priv;
2325 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2326 struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2327
2328 fcoe_ctlr_link_down(ctlr);
2329 fcoe_clean_pending_queue(ctlr->lp);
2330
2331 if (cdev->enabled != FCOE_CTLR_DISABLED &&
2332 !fcoe_link_ok(ctlr->lp))
2333 fcoe_ctlr_link_up(ctlr);
2334 return 0;
2335 }
2336
2337 /**
2338 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
2339 * @netdev: The net device used as a key
2340 *
2341 * Locking: Must be called with the RNL mutex held.
2342 *
2343 * Returns: NULL or the FCoE interface
2344 */
2345 static struct fcoe_interface *
fcoe_hostlist_lookup_port(const struct net_device * netdev)2346 fcoe_hostlist_lookup_port(const struct net_device *netdev)
2347 {
2348 struct fcoe_interface *fcoe;
2349
2350 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2351 if (fcoe->netdev == netdev)
2352 return fcoe;
2353 }
2354 return NULL;
2355 }
2356
2357 /**
2358 * fcoe_hostlist_lookup() - Find the local port associated with a
2359 * given net device
2360 * @netdev: The netdevice used as a key
2361 *
2362 * Locking: Must be called with the RTNL mutex held
2363 *
2364 * Returns: NULL or the local port
2365 */
fcoe_hostlist_lookup(const struct net_device * netdev)2366 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
2367 {
2368 struct fcoe_ctlr *ctlr;
2369 struct fcoe_interface *fcoe;
2370
2371 fcoe = fcoe_hostlist_lookup_port(netdev);
2372 ctlr = fcoe_to_ctlr(fcoe);
2373 return (fcoe) ? ctlr->lp : NULL;
2374 }
2375
2376 /**
2377 * fcoe_hostlist_add() - Add the FCoE interface identified by a local
2378 * port to the hostlist
2379 * @lport: The local port that identifies the FCoE interface to be added
2380 *
2381 * Locking: must be called with the RTNL mutex held
2382 *
2383 * Returns: 0 for success
2384 */
fcoe_hostlist_add(const struct fc_lport * lport)2385 static int fcoe_hostlist_add(const struct fc_lport *lport)
2386 {
2387 struct fcoe_interface *fcoe;
2388 struct fcoe_port *port;
2389
2390 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
2391 if (!fcoe) {
2392 port = lport_priv(lport);
2393 fcoe = port->priv;
2394 list_add_tail(&fcoe->list, &fcoe_hostlist);
2395 }
2396 return 0;
2397 }
2398
2399 /**
2400 * fcoe_hostlist_del() - Remove the FCoE interface identified by a local
2401 * port to the hostlist
2402 * @lport: The local port that identifies the FCoE interface to be added
2403 *
2404 * Locking: must be called with the RTNL mutex held
2405 *
2406 */
fcoe_hostlist_del(const struct fc_lport * lport)2407 static void fcoe_hostlist_del(const struct fc_lport *lport)
2408 {
2409 struct fcoe_interface *fcoe;
2410 struct fcoe_port *port;
2411
2412 port = lport_priv(lport);
2413 fcoe = port->priv;
2414 list_del(&fcoe->list);
2415 return;
2416 }
2417
2418 static struct fcoe_transport fcoe_sw_transport = {
2419 .name = {FCOE_TRANSPORT_DEFAULT},
2420 .attached = false,
2421 .list = LIST_HEAD_INIT(fcoe_sw_transport.list),
2422 .match = fcoe_match,
2423 .alloc = fcoe_ctlr_alloc,
2424 .create = fcoe_create,
2425 .destroy = fcoe_destroy,
2426 .enable = fcoe_enable,
2427 .disable = fcoe_disable,
2428 };
2429
2430 /**
2431 * fcoe_init() - Initialize fcoe.ko
2432 *
2433 * Returns: 0 on success, or a negative value on failure
2434 */
fcoe_init(void)2435 static int __init fcoe_init(void)
2436 {
2437 struct fcoe_percpu_s *p;
2438 unsigned int cpu;
2439 int rc = 0;
2440
2441 fcoe_wq = alloc_workqueue("fcoe", WQ_PERCPU, 0);
2442 if (!fcoe_wq)
2443 return -ENOMEM;
2444
2445 /* register as a fcoe transport */
2446 rc = fcoe_transport_attach(&fcoe_sw_transport);
2447 if (rc) {
2448 printk(KERN_ERR "failed to register an fcoe transport, check "
2449 "if libfcoe is loaded\n");
2450 goto out_destroy;
2451 }
2452
2453 mutex_lock(&fcoe_config_mutex);
2454
2455 for_each_possible_cpu(cpu) {
2456 p = per_cpu_ptr(&fcoe_percpu, cpu);
2457 INIT_WORK(&p->work, fcoe_receive_work);
2458 skb_queue_head_init(&p->fcoe_rx_list);
2459 local_lock_init(&p->lock);
2460 }
2461
2462 /* Setup link change notification */
2463 fcoe_dev_setup();
2464
2465 rc = fcoe_if_init();
2466 if (rc)
2467 goto out_free;
2468
2469 mutex_unlock(&fcoe_config_mutex);
2470 return 0;
2471
2472 out_free:
2473 mutex_unlock(&fcoe_config_mutex);
2474 fcoe_transport_detach(&fcoe_sw_transport);
2475 out_destroy:
2476 destroy_workqueue(fcoe_wq);
2477 return rc;
2478 }
2479 module_init(fcoe_init);
2480
2481 /**
2482 * fcoe_exit() - Clean up fcoe.ko
2483 *
2484 * Returns: 0 on success or a negative value on failure
2485 */
fcoe_exit(void)2486 static void __exit fcoe_exit(void)
2487 {
2488 struct fcoe_interface *fcoe, *tmp;
2489 struct fcoe_ctlr *ctlr;
2490 struct fcoe_port *port;
2491 unsigned int cpu;
2492
2493 mutex_lock(&fcoe_config_mutex);
2494
2495 fcoe_dev_cleanup();
2496
2497 /* releases the associated fcoe hosts */
2498 rtnl_lock();
2499 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
2500 ctlr = fcoe_to_ctlr(fcoe);
2501 port = lport_priv(ctlr->lp);
2502 fcoe_hostlist_del(port->lport);
2503 queue_work(fcoe_wq, &port->destroy_work);
2504 }
2505 rtnl_unlock();
2506
2507 for_each_possible_cpu(cpu)
2508 fcoe_thread_cleanup_local(cpu);
2509
2510 mutex_unlock(&fcoe_config_mutex);
2511
2512 /*
2513 * destroy_work's may be chained but destroy_workqueue()
2514 * can take care of them. Just kill the fcoe_wq.
2515 */
2516 destroy_workqueue(fcoe_wq);
2517
2518 /*
2519 * Detaching from the scsi transport must happen after all
2520 * destroys are done on the fcoe_wq. destroy_workqueue will
2521 * enusre the fcoe_wq is flushed.
2522 */
2523 fcoe_if_exit();
2524
2525 /* detach from fcoe transport */
2526 fcoe_transport_detach(&fcoe_sw_transport);
2527 }
2528 module_exit(fcoe_exit);
2529
2530 /**
2531 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
2532 * @seq: active sequence in the FLOGI or FDISC exchange
2533 * @fp: response frame, or error encoded in a pointer (timeout)
2534 * @arg: pointer to the fcoe_ctlr structure
2535 *
2536 * This handles MAC address management for FCoE, then passes control on to
2537 * the libfc FLOGI response handler.
2538 */
fcoe_flogi_resp(struct fc_seq * seq,struct fc_frame * fp,void * arg)2539 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2540 {
2541 struct fcoe_ctlr *fip = arg;
2542 struct fc_exch *exch = fc_seq_exch(seq);
2543 struct fc_lport *lport = exch->lp;
2544 u8 *mac;
2545
2546 if (IS_ERR(fp))
2547 goto done;
2548
2549 mac = fr_cb(fp)->granted_mac;
2550 /* pre-FIP */
2551 if (is_zero_ether_addr(mac))
2552 fcoe_ctlr_recv_flogi(fip, lport, fp);
2553 else
2554 fcoe_update_src_mac(lport, mac);
2555 done:
2556 fc_lport_flogi_resp(seq, fp, lport);
2557 }
2558
2559 /**
2560 * fcoe_logo_resp() - FCoE specific LOGO response handler
2561 * @seq: active sequence in the LOGO exchange
2562 * @fp: response frame, or error encoded in a pointer (timeout)
2563 * @arg: pointer to the fcoe_ctlr structure
2564 *
2565 * This handles MAC address management for FCoE, then passes control on to
2566 * the libfc LOGO response handler.
2567 */
fcoe_logo_resp(struct fc_seq * seq,struct fc_frame * fp,void * arg)2568 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2569 {
2570 struct fc_lport *lport = arg;
2571 static u8 zero_mac[ETH_ALEN] = { 0 };
2572
2573 if (!IS_ERR(fp))
2574 fcoe_update_src_mac(lport, zero_mac);
2575 fc_lport_logo_resp(seq, fp, lport);
2576 }
2577
2578 /*
2579 * fcoe_elsct_send - FCoE specific ELS handler
2580 *
2581 * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
2582 * using FCoE specific response handlers and passing the FIP controller as
2583 * the argument (the lport is still available from the exchange).
2584 *
2585 * Most of the work here is just handed off to the libfc routine.
2586 */
fcoe_elsct_send(struct fc_lport * lport,u32 did,struct fc_frame * fp,unsigned int op,void (* resp)(struct fc_seq *,struct fc_frame *,void *),void * arg,u32 timeout)2587 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
2588 struct fc_frame *fp, unsigned int op,
2589 void (*resp)(struct fc_seq *,
2590 struct fc_frame *,
2591 void *),
2592 void *arg, u32 timeout)
2593 {
2594 struct fcoe_port *port = lport_priv(lport);
2595 struct fcoe_interface *fcoe = port->priv;
2596 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
2597 struct fc_frame_header *fh = fc_frame_header_get(fp);
2598
2599 switch (op) {
2600 case ELS_FLOGI:
2601 case ELS_FDISC:
2602 if (lport->point_to_multipoint)
2603 break;
2604 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
2605 fip, timeout);
2606 case ELS_LOGO:
2607 /* only hook onto fabric logouts, not port logouts */
2608 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
2609 break;
2610 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
2611 lport, timeout);
2612 }
2613 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
2614 }
2615
2616 /**
2617 * fcoe_vport_create() - create an fc_host/scsi_host for a vport
2618 * @vport: fc_vport object to create a new fc_host for
2619 * @disabled: start the new fc_host in a disabled state by default?
2620 *
2621 * Returns: 0 for success
2622 */
fcoe_vport_create(struct fc_vport * vport,bool disabled)2623 static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
2624 {
2625 struct Scsi_Host *shost = vport_to_shost(vport);
2626 struct fc_lport *n_port = shost_priv(shost);
2627 struct fcoe_port *port = lport_priv(n_port);
2628 struct fcoe_interface *fcoe = port->priv;
2629 struct net_device *netdev = fcoe->netdev;
2630 struct fc_lport *vn_port;
2631 int rc;
2632 char buf[32];
2633
2634 rc = fcoe_validate_vport_create(vport);
2635 if (rc) {
2636 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
2637 printk(KERN_ERR "fcoe: Failed to create vport, "
2638 "WWPN (0x%s) already exists\n",
2639 buf);
2640 return rc;
2641 }
2642
2643 mutex_lock(&fcoe_config_mutex);
2644 rtnl_lock();
2645 vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
2646 rtnl_unlock();
2647 mutex_unlock(&fcoe_config_mutex);
2648
2649 if (IS_ERR(vn_port)) {
2650 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
2651 netdev->name);
2652 return -EIO;
2653 }
2654
2655 if (disabled) {
2656 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2657 } else {
2658 vn_port->boot_time = jiffies;
2659 fc_fabric_login(vn_port);
2660 fc_vport_setlink(vn_port);
2661 }
2662 return 0;
2663 }
2664
2665 /**
2666 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
2667 * @vport: fc_vport object that is being destroyed
2668 *
2669 * Returns: 0 for success
2670 */
fcoe_vport_destroy(struct fc_vport * vport)2671 static int fcoe_vport_destroy(struct fc_vport *vport)
2672 {
2673 struct Scsi_Host *shost = vport_to_shost(vport);
2674 struct fc_lport *n_port = shost_priv(shost);
2675 struct fc_lport *vn_port = vport->dd_data;
2676
2677 mutex_lock(&n_port->lp_mutex);
2678 list_del(&vn_port->list);
2679 mutex_unlock(&n_port->lp_mutex);
2680
2681 mutex_lock(&fcoe_config_mutex);
2682 rtnl_lock();
2683 fcoe_if_destroy(vn_port);
2684 rtnl_unlock();
2685 mutex_unlock(&fcoe_config_mutex);
2686
2687 return 0;
2688 }
2689
2690 /**
2691 * fcoe_vport_remove() - remove attached vports
2692 * @lport: lport for which the vports should be removed
2693 */
fcoe_vport_remove(struct fc_lport * lport)2694 static void fcoe_vport_remove(struct fc_lport *lport)
2695 {
2696 struct Scsi_Host *shost;
2697 struct fc_host_attrs *fc_host;
2698 unsigned long flags;
2699 struct fc_vport *vport;
2700 struct fc_vport *next_vport;
2701
2702 shost = lport->host;
2703 fc_host = shost_to_fc_host(shost);
2704
2705 /* Loop through all the vports and mark them for deletion */
2706 spin_lock_irqsave(shost->host_lock, flags);
2707 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2708 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
2709 continue;
2710 } else {
2711 vport->flags |= FC_VPORT_DELETING;
2712 queue_work(fc_host_work_q(shost),
2713 &vport->vport_delete_work);
2714 }
2715 }
2716 spin_unlock_irqrestore(shost->host_lock, flags);
2717
2718 flush_workqueue(fc_host_work_q(shost));
2719 }
2720
2721 /**
2722 * fcoe_vport_disable() - change vport state
2723 * @vport: vport to bring online/offline
2724 * @disable: should the vport be disabled?
2725 */
fcoe_vport_disable(struct fc_vport * vport,bool disable)2726 static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
2727 {
2728 struct fc_lport *lport = vport->dd_data;
2729
2730 if (disable) {
2731 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2732 fc_fabric_logoff(lport);
2733 } else {
2734 lport->boot_time = jiffies;
2735 fc_fabric_login(lport);
2736 fc_vport_setlink(lport);
2737 }
2738
2739 return 0;
2740 }
2741
2742 /**
2743 * fcoe_set_vport_symbolic_name() - append vport string to symbolic name
2744 * @vport: fc_vport with a new symbolic name string
2745 *
2746 * After generating a new symbolic name string, a new RSPN_ID request is
2747 * sent to the name server. There is no response handler, so if it fails
2748 * for some reason it will not be retried.
2749 */
fcoe_set_vport_symbolic_name(struct fc_vport * vport)2750 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
2751 {
2752 struct fc_lport *lport = vport->dd_data;
2753 struct fc_frame *fp;
2754 size_t len;
2755
2756 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
2757 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
2758 fcoe_netdev(lport)->name, vport->symbolic_name);
2759
2760 if (lport->state != LPORT_ST_READY)
2761 return;
2762
2763 len = strnlen(fc_host_symbolic_name(lport->host), 255);
2764 fp = fc_frame_alloc(lport,
2765 sizeof(struct fc_ct_hdr) +
2766 sizeof(struct fc_ns_rspn) + len);
2767 if (!fp)
2768 return;
2769 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
2770 NULL, NULL, 3 * lport->r_a_tov);
2771 }
2772
fcoe_fcf_get_vlan_id(struct fcoe_fcf_device * fcf_dev)2773 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev)
2774 {
2775 struct fcoe_ctlr_device *ctlr_dev =
2776 fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2777 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2778 struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2779
2780 fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev);
2781 }
2782
2783 /**
2784 * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
2785 * @lport: the local port
2786 * @port_id: the port ID
2787 * @fp: the received frame, if any, that caused the port_id to be set.
2788 *
2789 * This routine handles the case where we received a FLOGI and are
2790 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi()
2791 * so it can set the non-mapped mode and gateway address.
2792 *
2793 * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
2794 */
fcoe_set_port_id(struct fc_lport * lport,u32 port_id,struct fc_frame * fp)2795 static void fcoe_set_port_id(struct fc_lport *lport,
2796 u32 port_id, struct fc_frame *fp)
2797 {
2798 struct fcoe_port *port = lport_priv(lport);
2799 struct fcoe_interface *fcoe = port->priv;
2800 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2801
2802 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
2803 fcoe_ctlr_recv_flogi(ctlr, lport, fp);
2804 }
2805