xref: /openbmc/linux/drivers/scsi/fcoe/fcoe.c (revision 1c2dd16a)
1 /*
2  * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  *
13  * You should have received a copy of the GNU General Public License along with
14  * this program; if not, write to the Free Software Foundation, Inc.,
15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16  *
17  * Maintained at www.Open-FCoE.org
18  */
19 
20 #include <linux/module.h>
21 #include <linux/spinlock.h>
22 #include <linux/netdevice.h>
23 #include <linux/etherdevice.h>
24 #include <linux/ethtool.h>
25 #include <linux/if_ether.h>
26 #include <linux/if_vlan.h>
27 #include <linux/crc32.h>
28 #include <linux/slab.h>
29 #include <linux/cpu.h>
30 #include <linux/fs.h>
31 #include <linux/sysfs.h>
32 #include <linux/ctype.h>
33 #include <linux/workqueue.h>
34 #include <net/dcbnl.h>
35 #include <net/dcbevent.h>
36 #include <scsi/scsi_tcq.h>
37 #include <scsi/scsicam.h>
38 #include <scsi/scsi_transport.h>
39 #include <scsi/scsi_transport_fc.h>
40 #include <net/rtnetlink.h>
41 
42 #include <scsi/fc/fc_encaps.h>
43 #include <scsi/fc/fc_fip.h>
44 #include <scsi/fc/fc_fcoe.h>
45 
46 #include <scsi/libfc.h>
47 #include <scsi/fc_frame.h>
48 #include <scsi/libfcoe.h>
49 
50 #include "fcoe.h"
51 
52 MODULE_AUTHOR("Open-FCoE.org");
53 MODULE_DESCRIPTION("FCoE");
54 MODULE_LICENSE("GPL v2");
55 
56 /* Performance tuning parameters for fcoe */
57 static unsigned int fcoe_ddp_min = 4096;
58 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
59 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for "	\
60 		 "Direct Data Placement (DDP).");
61 
62 unsigned int fcoe_debug_logging;
63 module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR);
64 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
65 
66 unsigned int fcoe_e_d_tov = 2 * 1000;
67 module_param_named(e_d_tov, fcoe_e_d_tov, int, S_IRUGO|S_IWUSR);
68 MODULE_PARM_DESC(e_d_tov, "E_D_TOV in ms, default 2000");
69 
70 unsigned int fcoe_r_a_tov = 2 * 2 * 1000;
71 module_param_named(r_a_tov, fcoe_r_a_tov, int, S_IRUGO|S_IWUSR);
72 MODULE_PARM_DESC(r_a_tov, "R_A_TOV in ms, default 4000");
73 
74 static DEFINE_MUTEX(fcoe_config_mutex);
75 
76 static struct workqueue_struct *fcoe_wq;
77 
78 /* fcoe host list */
79 /* must only by accessed under the RTNL mutex */
80 static LIST_HEAD(fcoe_hostlist);
81 static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
82 
83 /* Function Prototypes */
84 static int fcoe_reset(struct Scsi_Host *);
85 static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
86 static int fcoe_rcv(struct sk_buff *, struct net_device *,
87 		    struct packet_type *, struct net_device *);
88 static void fcoe_percpu_clean(struct fc_lport *);
89 static int fcoe_link_ok(struct fc_lport *);
90 
91 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
92 static int fcoe_hostlist_add(const struct fc_lport *);
93 static void fcoe_hostlist_del(const struct fc_lport *);
94 
95 static int fcoe_device_notification(struct notifier_block *, ulong, void *);
96 static void fcoe_dev_setup(void);
97 static void fcoe_dev_cleanup(void);
98 static struct fcoe_interface
99 *fcoe_hostlist_lookup_port(const struct net_device *);
100 
101 static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
102 			 struct packet_type *, struct net_device *);
103 static int fcoe_fip_vlan_recv(struct sk_buff *, struct net_device *,
104 			      struct packet_type *, struct net_device *);
105 
106 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
107 static void fcoe_update_src_mac(struct fc_lport *, u8 *);
108 static u8 *fcoe_get_src_mac(struct fc_lport *);
109 static void fcoe_destroy_work(struct work_struct *);
110 
111 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
112 			  unsigned int);
113 static int fcoe_ddp_done(struct fc_lport *, u16);
114 static int fcoe_ddp_target(struct fc_lport *, u16, struct scatterlist *,
115 			   unsigned int);
116 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
117 				     ulong event, void *ptr);
118 
119 static bool fcoe_match(struct net_device *netdev);
120 static int fcoe_create(struct net_device *netdev, enum fip_mode fip_mode);
121 static int fcoe_destroy(struct net_device *netdev);
122 static int fcoe_enable(struct net_device *netdev);
123 static int fcoe_disable(struct net_device *netdev);
124 
125 /* fcoe_syfs control interface handlers */
126 static int fcoe_ctlr_alloc(struct net_device *netdev);
127 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev);
128 static void fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev);
129 
130 static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
131 				      u32 did, struct fc_frame *,
132 				      unsigned int op,
133 				      void (*resp)(struct fc_seq *,
134 						   struct fc_frame *,
135 						   void *),
136 				      void *, u32 timeout);
137 static void fcoe_recv_frame(struct sk_buff *skb);
138 
139 /* notification function for packets from net device */
140 static struct notifier_block fcoe_notifier = {
141 	.notifier_call = fcoe_device_notification,
142 };
143 
144 /* notification function for DCB events */
145 static struct notifier_block dcb_notifier = {
146 	.notifier_call = fcoe_dcb_app_notification,
147 };
148 
149 static struct scsi_transport_template *fcoe_nport_scsi_transport;
150 static struct scsi_transport_template *fcoe_vport_scsi_transport;
151 
152 static int fcoe_vport_destroy(struct fc_vport *);
153 static int fcoe_vport_create(struct fc_vport *, bool disabled);
154 static int fcoe_vport_disable(struct fc_vport *, bool disable);
155 static void fcoe_set_vport_symbolic_name(struct fc_vport *);
156 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
157 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *);
158 
159 
160 static struct fcoe_sysfs_function_template fcoe_sysfs_templ = {
161 	.set_fcoe_ctlr_mode = fcoe_ctlr_mode,
162 	.set_fcoe_ctlr_enabled = fcoe_ctlr_enabled,
163 	.get_fcoe_ctlr_link_fail = fcoe_ctlr_get_lesb,
164 	.get_fcoe_ctlr_vlink_fail = fcoe_ctlr_get_lesb,
165 	.get_fcoe_ctlr_miss_fka = fcoe_ctlr_get_lesb,
166 	.get_fcoe_ctlr_symb_err = fcoe_ctlr_get_lesb,
167 	.get_fcoe_ctlr_err_block = fcoe_ctlr_get_lesb,
168 	.get_fcoe_ctlr_fcs_error = fcoe_ctlr_get_lesb,
169 
170 	.get_fcoe_fcf_selected = fcoe_fcf_get_selected,
171 	.get_fcoe_fcf_vlan_id = fcoe_fcf_get_vlan_id,
172 };
173 
174 static struct libfc_function_template fcoe_libfc_fcn_templ = {
175 	.frame_send = fcoe_xmit,
176 	.ddp_setup = fcoe_ddp_setup,
177 	.ddp_done = fcoe_ddp_done,
178 	.ddp_target = fcoe_ddp_target,
179 	.elsct_send = fcoe_elsct_send,
180 	.get_lesb = fcoe_get_lesb,
181 	.lport_set_port_id = fcoe_set_port_id,
182 };
183 
184 static struct fc_function_template fcoe_nport_fc_functions = {
185 	.show_host_node_name = 1,
186 	.show_host_port_name = 1,
187 	.show_host_supported_classes = 1,
188 	.show_host_supported_fc4s = 1,
189 	.show_host_active_fc4s = 1,
190 	.show_host_maxframe_size = 1,
191 	.show_host_serial_number = 1,
192 	.show_host_manufacturer = 1,
193 	.show_host_model = 1,
194 	.show_host_model_description = 1,
195 	.show_host_hardware_version = 1,
196 	.show_host_driver_version = 1,
197 	.show_host_firmware_version = 1,
198 	.show_host_optionrom_version = 1,
199 
200 	.show_host_port_id = 1,
201 	.show_host_supported_speeds = 1,
202 	.get_host_speed = fc_get_host_speed,
203 	.show_host_speed = 1,
204 	.show_host_port_type = 1,
205 	.get_host_port_state = fc_get_host_port_state,
206 	.show_host_port_state = 1,
207 	.show_host_symbolic_name = 1,
208 
209 	.dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
210 	.show_rport_maxframe_size = 1,
211 	.show_rport_supported_classes = 1,
212 
213 	.show_host_fabric_name = 1,
214 	.show_starget_node_name = 1,
215 	.show_starget_port_name = 1,
216 	.show_starget_port_id = 1,
217 	.set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
218 	.show_rport_dev_loss_tmo = 1,
219 	.get_fc_host_stats = fc_get_host_stats,
220 	.issue_fc_host_lip = fcoe_reset,
221 
222 	.terminate_rport_io = fc_rport_terminate_io,
223 
224 	.vport_create = fcoe_vport_create,
225 	.vport_delete = fcoe_vport_destroy,
226 	.vport_disable = fcoe_vport_disable,
227 	.set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
228 
229 	.bsg_request = fc_lport_bsg_request,
230 };
231 
232 static struct fc_function_template fcoe_vport_fc_functions = {
233 	.show_host_node_name = 1,
234 	.show_host_port_name = 1,
235 	.show_host_supported_classes = 1,
236 	.show_host_supported_fc4s = 1,
237 	.show_host_active_fc4s = 1,
238 	.show_host_maxframe_size = 1,
239 	.show_host_serial_number = 1,
240 	.show_host_manufacturer = 1,
241 	.show_host_model = 1,
242 	.show_host_model_description = 1,
243 	.show_host_hardware_version = 1,
244 	.show_host_driver_version = 1,
245 	.show_host_firmware_version = 1,
246 	.show_host_optionrom_version = 1,
247 
248 	.show_host_port_id = 1,
249 	.show_host_supported_speeds = 1,
250 	.get_host_speed = fc_get_host_speed,
251 	.show_host_speed = 1,
252 	.show_host_port_type = 1,
253 	.get_host_port_state = fc_get_host_port_state,
254 	.show_host_port_state = 1,
255 	.show_host_symbolic_name = 1,
256 
257 	.dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
258 	.show_rport_maxframe_size = 1,
259 	.show_rport_supported_classes = 1,
260 
261 	.show_host_fabric_name = 1,
262 	.show_starget_node_name = 1,
263 	.show_starget_port_name = 1,
264 	.show_starget_port_id = 1,
265 	.set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
266 	.show_rport_dev_loss_tmo = 1,
267 	.get_fc_host_stats = fc_get_host_stats,
268 	.issue_fc_host_lip = fcoe_reset,
269 
270 	.terminate_rport_io = fc_rport_terminate_io,
271 
272 	.bsg_request = fc_lport_bsg_request,
273 };
274 
275 static struct scsi_host_template fcoe_shost_template = {
276 	.module = THIS_MODULE,
277 	.name = "FCoE Driver",
278 	.proc_name = FCOE_NAME,
279 	.queuecommand = fc_queuecommand,
280 	.eh_timed_out = fc_eh_timed_out,
281 	.eh_abort_handler = fc_eh_abort,
282 	.eh_device_reset_handler = fc_eh_device_reset,
283 	.eh_host_reset_handler = fc_eh_host_reset,
284 	.slave_alloc = fc_slave_alloc,
285 	.change_queue_depth = scsi_change_queue_depth,
286 	.this_id = -1,
287 	.cmd_per_lun = 3,
288 	.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
289 	.use_clustering = ENABLE_CLUSTERING,
290 	.sg_tablesize = SG_ALL,
291 	.max_sectors = 0xffff,
292 	.track_queue_depth = 1,
293 };
294 
295 /**
296  * fcoe_interface_setup() - Setup a FCoE interface
297  * @fcoe:   The new FCoE interface
298  * @netdev: The net device that the fcoe interface is on
299  *
300  * Returns : 0 for success
301  * Locking: must be called with the RTNL mutex held
302  */
303 static int fcoe_interface_setup(struct fcoe_interface *fcoe,
304 				struct net_device *netdev)
305 {
306 	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
307 	struct netdev_hw_addr *ha;
308 	struct net_device *real_dev;
309 	u8 flogi_maddr[ETH_ALEN];
310 	const struct net_device_ops *ops;
311 
312 	fcoe->netdev = netdev;
313 
314 	/* Let LLD initialize for FCoE */
315 	ops = netdev->netdev_ops;
316 	if (ops->ndo_fcoe_enable) {
317 		if (ops->ndo_fcoe_enable(netdev))
318 			FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
319 					" specific feature for LLD.\n");
320 	}
321 
322 	/* Do not support for bonding device */
323 	if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) {
324 		FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
325 		return -EOPNOTSUPP;
326 	}
327 
328 	/* look for SAN MAC address, if multiple SAN MACs exist, only
329 	 * use the first one for SPMA */
330 	real_dev = is_vlan_dev(netdev) ? vlan_dev_real_dev(netdev) : netdev;
331 	fcoe->realdev = real_dev;
332 	rcu_read_lock();
333 	for_each_dev_addr(real_dev, ha) {
334 		if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
335 		    (is_valid_ether_addr(ha->addr))) {
336 			memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
337 			fip->spma = 1;
338 			break;
339 		}
340 	}
341 	rcu_read_unlock();
342 
343 	/* setup Source Mac Address */
344 	if (!fip->spma)
345 		memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
346 
347 	/*
348 	 * Add FCoE MAC address as second unicast MAC address
349 	 * or enter promiscuous mode if not capable of listening
350 	 * for multiple unicast MACs.
351 	 */
352 	memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
353 	dev_uc_add(netdev, flogi_maddr);
354 	if (fip->spma)
355 		dev_uc_add(netdev, fip->ctl_src_addr);
356 	if (fip->mode == FIP_MODE_VN2VN) {
357 		dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
358 		dev_mc_add(netdev, FIP_ALL_P2P_MACS);
359 	} else
360 		dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
361 
362 	/*
363 	 * setup the receive function from ethernet driver
364 	 * on the ethertype for the given device
365 	 */
366 	fcoe->fcoe_packet_type.func = fcoe_rcv;
367 	fcoe->fcoe_packet_type.type = htons(ETH_P_FCOE);
368 	fcoe->fcoe_packet_type.dev = netdev;
369 	dev_add_pack(&fcoe->fcoe_packet_type);
370 
371 	fcoe->fip_packet_type.func = fcoe_fip_recv;
372 	fcoe->fip_packet_type.type = htons(ETH_P_FIP);
373 	fcoe->fip_packet_type.dev = netdev;
374 	dev_add_pack(&fcoe->fip_packet_type);
375 
376 	if (netdev != real_dev) {
377 		fcoe->fip_vlan_packet_type.func = fcoe_fip_vlan_recv;
378 		fcoe->fip_vlan_packet_type.type = htons(ETH_P_FIP);
379 		fcoe->fip_vlan_packet_type.dev = real_dev;
380 		dev_add_pack(&fcoe->fip_vlan_packet_type);
381 	}
382 	return 0;
383 }
384 
385 /**
386  * fcoe_interface_create() - Create a FCoE interface on a net device
387  * @netdev: The net device to create the FCoE interface on
388  * @fip_mode: The mode to use for FIP
389  *
390  * Returns: pointer to a struct fcoe_interface or NULL on error
391  */
392 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
393 						    enum fip_state fip_mode)
394 {
395 	struct fcoe_ctlr_device *ctlr_dev;
396 	struct fcoe_ctlr *ctlr;
397 	struct fcoe_interface *fcoe;
398 	int size;
399 	int err;
400 
401 	if (!try_module_get(THIS_MODULE)) {
402 		FCOE_NETDEV_DBG(netdev,
403 				"Could not get a reference to the module\n");
404 		fcoe = ERR_PTR(-EBUSY);
405 		goto out;
406 	}
407 
408 	size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface);
409 	ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ,
410 					size);
411 	if (!ctlr_dev) {
412 		FCOE_DBG("Failed to add fcoe_ctlr_device\n");
413 		fcoe = ERR_PTR(-ENOMEM);
414 		goto out_putmod;
415 	}
416 
417 	ctlr = fcoe_ctlr_device_priv(ctlr_dev);
418 	ctlr->cdev = ctlr_dev;
419 	fcoe = fcoe_ctlr_priv(ctlr);
420 
421 	dev_hold(netdev);
422 
423 	/*
424 	 * Initialize FIP.
425 	 */
426 	fcoe_ctlr_init(ctlr, fip_mode);
427 	ctlr->send = fcoe_fip_send;
428 	ctlr->update_mac = fcoe_update_src_mac;
429 	ctlr->get_src_addr = fcoe_get_src_mac;
430 
431 	err = fcoe_interface_setup(fcoe, netdev);
432 	if (err) {
433 		fcoe_ctlr_destroy(ctlr);
434 		fcoe_ctlr_device_delete(ctlr_dev);
435 		dev_put(netdev);
436 		fcoe = ERR_PTR(err);
437 		goto out_putmod;
438 	}
439 
440 	goto out;
441 
442 out_putmod:
443 	module_put(THIS_MODULE);
444 out:
445 	return fcoe;
446 }
447 
448 /**
449  * fcoe_interface_remove() - remove FCoE interface from netdev
450  * @fcoe: The FCoE interface to be cleaned up
451  *
452  * Caller must be holding the RTNL mutex
453  */
454 static void fcoe_interface_remove(struct fcoe_interface *fcoe)
455 {
456 	struct net_device *netdev = fcoe->netdev;
457 	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
458 	u8 flogi_maddr[ETH_ALEN];
459 	const struct net_device_ops *ops;
460 
461 	/*
462 	 * Don't listen for Ethernet packets anymore.
463 	 * synchronize_net() ensures that the packet handlers are not running
464 	 * on another CPU. dev_remove_pack() would do that, this calls the
465 	 * unsyncronized version __dev_remove_pack() to avoid multiple delays.
466 	 */
467 	__dev_remove_pack(&fcoe->fcoe_packet_type);
468 	__dev_remove_pack(&fcoe->fip_packet_type);
469 	if (netdev != fcoe->realdev)
470 		__dev_remove_pack(&fcoe->fip_vlan_packet_type);
471 	synchronize_net();
472 
473 	/* Delete secondary MAC addresses */
474 	memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
475 	dev_uc_del(netdev, flogi_maddr);
476 	if (fip->spma)
477 		dev_uc_del(netdev, fip->ctl_src_addr);
478 	if (fip->mode == FIP_MODE_VN2VN) {
479 		dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
480 		dev_mc_del(netdev, FIP_ALL_P2P_MACS);
481 	} else
482 		dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
483 
484 	/* Tell the LLD we are done w/ FCoE */
485 	ops = netdev->netdev_ops;
486 	if (ops->ndo_fcoe_disable) {
487 		if (ops->ndo_fcoe_disable(netdev))
488 			FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
489 					" specific feature for LLD.\n");
490 	}
491 	fcoe->removed = 1;
492 }
493 
494 
495 /**
496  * fcoe_interface_cleanup() - Clean up a FCoE interface
497  * @fcoe: The FCoE interface to be cleaned up
498  */
499 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
500 {
501 	struct net_device *netdev = fcoe->netdev;
502 	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
503 
504 	rtnl_lock();
505 	if (!fcoe->removed)
506 		fcoe_interface_remove(fcoe);
507 	rtnl_unlock();
508 
509 	/* Release the self-reference taken during fcoe_interface_create() */
510 	/* tear-down the FCoE controller */
511 	fcoe_ctlr_destroy(fip);
512 	scsi_host_put(fip->lp->host);
513 	dev_put(netdev);
514 	module_put(THIS_MODULE);
515 }
516 
517 /**
518  * fcoe_fip_recv() - Handler for received FIP frames
519  * @skb:      The receive skb
520  * @netdev:   The associated net device
521  * @ptype:    The packet_type structure which was used to register this handler
522  * @orig_dev: The original net_device the the skb was received on.
523  *	      (in case dev is a bond)
524  *
525  * Returns: 0 for success
526  */
527 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
528 			 struct packet_type *ptype,
529 			 struct net_device *orig_dev)
530 {
531 	struct fcoe_interface *fcoe;
532 	struct fcoe_ctlr *ctlr;
533 
534 	fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
535 	ctlr = fcoe_to_ctlr(fcoe);
536 	fcoe_ctlr_recv(ctlr, skb);
537 	return 0;
538 }
539 
540 /**
541  * fcoe_fip_vlan_recv() - Handler for received FIP VLAN discovery frames
542  * @skb:      The receive skb
543  * @netdev:   The associated net device
544  * @ptype:    The packet_type structure which was used to register this handler
545  * @orig_dev: The original net_device the the skb was received on.
546  *	      (in case dev is a bond)
547  *
548  * Returns: 0 for success
549  */
550 static int fcoe_fip_vlan_recv(struct sk_buff *skb, struct net_device *netdev,
551 			      struct packet_type *ptype,
552 			      struct net_device *orig_dev)
553 {
554 	struct fcoe_interface *fcoe;
555 	struct fcoe_ctlr *ctlr;
556 
557 	fcoe = container_of(ptype, struct fcoe_interface, fip_vlan_packet_type);
558 	ctlr = fcoe_to_ctlr(fcoe);
559 	fcoe_ctlr_recv(ctlr, skb);
560 	return 0;
561 }
562 
563 /**
564  * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame
565  * @port: The FCoE port
566  * @skb: The FIP/FCoE packet to be sent
567  */
568 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb)
569 {
570 	if (port->fcoe_pending_queue.qlen)
571 		fcoe_check_wait_queue(port->lport, skb);
572 	else if (fcoe_start_io(skb))
573 		fcoe_check_wait_queue(port->lport, skb);
574 }
575 
576 /**
577  * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
578  * @fip: The FCoE controller
579  * @skb: The FIP packet to be sent
580  */
581 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
582 {
583 	struct fcoe_interface *fcoe = fcoe_from_ctlr(fip);
584 	struct fip_frame {
585 		struct ethhdr eth;
586 		struct fip_header fip;
587 	} __packed *frame;
588 
589 	/*
590 	 * Use default VLAN for FIP VLAN discovery protocol
591 	 */
592 	frame = (struct fip_frame *)skb->data;
593 	if (ntohs(frame->eth.h_proto) == ETH_P_FIP &&
594 	    ntohs(frame->fip.fip_op) == FIP_OP_VLAN &&
595 	    fcoe->realdev != fcoe->netdev)
596 		skb->dev = fcoe->realdev;
597 	else
598 		skb->dev = fcoe->netdev;
599 	fcoe_port_send(lport_priv(fip->lp), skb);
600 }
601 
602 /**
603  * fcoe_update_src_mac() - Update the Ethernet MAC filters
604  * @lport: The local port to update the source MAC on
605  * @addr:  Unicast MAC address to add
606  *
607  * Remove any previously-set unicast MAC filter.
608  * Add secondary FCoE MAC address filter for our OUI.
609  */
610 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
611 {
612 	struct fcoe_port *port = lport_priv(lport);
613 	struct fcoe_interface *fcoe = port->priv;
614 
615 	if (!is_zero_ether_addr(port->data_src_addr))
616 		dev_uc_del(fcoe->netdev, port->data_src_addr);
617 	if (!is_zero_ether_addr(addr))
618 		dev_uc_add(fcoe->netdev, addr);
619 	memcpy(port->data_src_addr, addr, ETH_ALEN);
620 }
621 
622 /**
623  * fcoe_get_src_mac() - return the Ethernet source address for an lport
624  * @lport: libfc lport
625  */
626 static u8 *fcoe_get_src_mac(struct fc_lport *lport)
627 {
628 	struct fcoe_port *port = lport_priv(lport);
629 
630 	return port->data_src_addr;
631 }
632 
633 /**
634  * fcoe_lport_config() - Set up a local port
635  * @lport: The local port to be setup
636  *
637  * Returns: 0 for success
638  */
639 static int fcoe_lport_config(struct fc_lport *lport)
640 {
641 	lport->link_up = 0;
642 	lport->qfull = 0;
643 	lport->max_retry_count = 3;
644 	lport->max_rport_retry_count = 3;
645 	lport->e_d_tov = fcoe_e_d_tov;
646 	lport->r_a_tov = fcoe_r_a_tov;
647 	lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
648 				 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
649 	lport->does_npiv = 1;
650 
651 	fc_lport_init_stats(lport);
652 
653 	/* lport fc_lport related configuration */
654 	fc_lport_config(lport);
655 
656 	/* offload related configuration */
657 	lport->crc_offload = 0;
658 	lport->seq_offload = 0;
659 	lport->lro_enabled = 0;
660 	lport->lro_xid = 0;
661 	lport->lso_max = 0;
662 
663 	return 0;
664 }
665 
666 /**
667  * fcoe_netdev_features_change - Updates the lport's offload flags based
668  * on the LLD netdev's FCoE feature flags
669  */
670 static void fcoe_netdev_features_change(struct fc_lport *lport,
671 					struct net_device *netdev)
672 {
673 	mutex_lock(&lport->lp_mutex);
674 
675 	if (netdev->features & NETIF_F_SG)
676 		lport->sg_supp = 1;
677 	else
678 		lport->sg_supp = 0;
679 
680 	if (netdev->features & NETIF_F_FCOE_CRC) {
681 		lport->crc_offload = 1;
682 		FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
683 	} else {
684 		lport->crc_offload = 0;
685 	}
686 
687 	if (netdev->features & NETIF_F_FSO) {
688 		lport->seq_offload = 1;
689 		lport->lso_max = netdev->gso_max_size;
690 		FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
691 				lport->lso_max);
692 	} else {
693 		lport->seq_offload = 0;
694 		lport->lso_max = 0;
695 	}
696 
697 	if (netdev->fcoe_ddp_xid) {
698 		lport->lro_enabled = 1;
699 		lport->lro_xid = netdev->fcoe_ddp_xid;
700 		FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
701 				lport->lro_xid);
702 	} else {
703 		lport->lro_enabled = 0;
704 		lport->lro_xid = 0;
705 	}
706 
707 	mutex_unlock(&lport->lp_mutex);
708 }
709 
710 /**
711  * fcoe_netdev_config() - Set up net devive for SW FCoE
712  * @lport:  The local port that is associated with the net device
713  * @netdev: The associated net device
714  *
715  * Must be called after fcoe_lport_config() as it will use local port mutex
716  *
717  * Returns: 0 for success
718  */
719 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
720 {
721 	u32 mfs;
722 	u64 wwnn, wwpn;
723 	struct fcoe_interface *fcoe;
724 	struct fcoe_ctlr *ctlr;
725 	struct fcoe_port *port;
726 
727 	/* Setup lport private data to point to fcoe softc */
728 	port = lport_priv(lport);
729 	fcoe = port->priv;
730 	ctlr = fcoe_to_ctlr(fcoe);
731 
732 	/* Figure out the VLAN ID, if any */
733 	if (is_vlan_dev(netdev))
734 		lport->vlan = vlan_dev_vlan_id(netdev);
735 	else
736 		lport->vlan = 0;
737 
738 	/*
739 	 * Determine max frame size based on underlying device and optional
740 	 * user-configured limit.  If the MFS is too low, fcoe_link_ok()
741 	 * will return 0, so do this first.
742 	 */
743 	mfs = netdev->mtu;
744 	if (netdev->features & NETIF_F_FCOE_MTU) {
745 		mfs = FCOE_MTU;
746 		FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
747 	}
748 	mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
749 	if (fc_set_mfs(lport, mfs))
750 		return -EINVAL;
751 
752 	/* offload features support */
753 	fcoe_netdev_features_change(lport, netdev);
754 
755 	skb_queue_head_init(&port->fcoe_pending_queue);
756 	port->fcoe_pending_queue_active = 0;
757 	setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
758 
759 	fcoe_link_speed_update(lport);
760 
761 	if (!lport->vport) {
762 		if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
763 			wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0);
764 		fc_set_wwnn(lport, wwnn);
765 		if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
766 			wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr,
767 						 2, 0);
768 		fc_set_wwpn(lport, wwpn);
769 	}
770 
771 	return 0;
772 }
773 
774 /**
775  * fcoe_shost_config() - Set up the SCSI host associated with a local port
776  * @lport: The local port
777  * @dev:   The device associated with the SCSI host
778  *
779  * Must be called after fcoe_lport_config() and fcoe_netdev_config()
780  *
781  * Returns: 0 for success
782  */
783 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
784 {
785 	int rc = 0;
786 
787 	/* lport scsi host config */
788 	lport->host->max_lun = FCOE_MAX_LUN;
789 	lport->host->max_id = FCOE_MAX_FCP_TARGET;
790 	lport->host->max_channel = 0;
791 	lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
792 
793 	if (lport->vport)
794 		lport->host->transportt = fcoe_vport_scsi_transport;
795 	else
796 		lport->host->transportt = fcoe_nport_scsi_transport;
797 
798 	/* add the new host to the SCSI-ml */
799 	rc = scsi_add_host(lport->host, dev);
800 	if (rc) {
801 		FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
802 				"error on scsi_add_host\n");
803 		return rc;
804 	}
805 
806 	if (!lport->vport)
807 		fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
808 
809 	snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
810 		 "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
811 		 fcoe_netdev(lport)->name);
812 
813 	return 0;
814 }
815 
816 
817 /**
818  * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE
819  * @lport:  The local port that is associated with the net device
820  * @netdev: The associated net device
821  *
822  * Must be called after fcoe_shost_config() as it will use local port mutex
823  *
824  */
825 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
826 {
827 	struct fcoe_interface *fcoe;
828 	struct fcoe_port *port;
829 	struct net_device *realdev;
830 	int rc;
831 
832 	port = lport_priv(lport);
833 	fcoe = port->priv;
834 	realdev = fcoe->realdev;
835 
836 	/* No FDMI state m/c for NPIV ports */
837 	if (lport->vport)
838 		return;
839 
840 	if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) {
841 		struct netdev_fcoe_hbainfo *fdmi;
842 		fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL);
843 		if (!fdmi)
844 			return;
845 
846 		rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev,
847 							       fdmi);
848 		if (rc) {
849 			printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
850 					"information from netdev.\n");
851 			return;
852 		}
853 
854 		snprintf(fc_host_serial_number(lport->host),
855 			 FC_SERIAL_NUMBER_SIZE,
856 			 "%s",
857 			 fdmi->serial_number);
858 		snprintf(fc_host_manufacturer(lport->host),
859 			 FC_SERIAL_NUMBER_SIZE,
860 			 "%s",
861 			 fdmi->manufacturer);
862 		snprintf(fc_host_model(lport->host),
863 			 FC_SYMBOLIC_NAME_SIZE,
864 			 "%s",
865 			 fdmi->model);
866 		snprintf(fc_host_model_description(lport->host),
867 			 FC_SYMBOLIC_NAME_SIZE,
868 			 "%s",
869 			 fdmi->model_description);
870 		snprintf(fc_host_hardware_version(lport->host),
871 			 FC_VERSION_STRING_SIZE,
872 			 "%s",
873 			 fdmi->hardware_version);
874 		snprintf(fc_host_driver_version(lport->host),
875 			 FC_VERSION_STRING_SIZE,
876 			 "%s",
877 			 fdmi->driver_version);
878 		snprintf(fc_host_optionrom_version(lport->host),
879 			 FC_VERSION_STRING_SIZE,
880 			 "%s",
881 			 fdmi->optionrom_version);
882 		snprintf(fc_host_firmware_version(lport->host),
883 			 FC_VERSION_STRING_SIZE,
884 			 "%s",
885 			 fdmi->firmware_version);
886 
887 		/* Enable FDMI lport states */
888 		lport->fdmi_enabled = 1;
889 		kfree(fdmi);
890 	} else {
891 		lport->fdmi_enabled = 0;
892 		printk(KERN_INFO "fcoe: No FDMI support.\n");
893 	}
894 }
895 
896 /**
897  * fcoe_oem_match() - The match routine for the offloaded exchange manager
898  * @fp: The I/O frame
899  *
900  * This routine will be associated with an exchange manager (EM). When
901  * the libfc exchange handling code is looking for an EM to use it will
902  * call this routine and pass it the frame that it wishes to send. This
903  * routine will return True if the associated EM is to be used and False
904  * if the echange code should continue looking for an EM.
905  *
906  * The offload EM that this routine is associated with will handle any
907  * packets that are for SCSI read requests.
908  *
909  * This has been enhanced to work when FCoE stack is operating in target
910  * mode.
911  *
912  * Returns: True for read types I/O, otherwise returns false.
913  */
914 static bool fcoe_oem_match(struct fc_frame *fp)
915 {
916 	struct fc_frame_header *fh = fc_frame_header_get(fp);
917 	struct fcp_cmnd *fcp;
918 
919 	if (fc_fcp_is_read(fr_fsp(fp)) &&
920 	    (fr_fsp(fp)->data_len > fcoe_ddp_min))
921 		return true;
922 	else if ((fr_fsp(fp) == NULL) &&
923 		 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) &&
924 		 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) {
925 		fcp = fc_frame_payload_get(fp, sizeof(*fcp));
926 		if ((fcp->fc_flags & FCP_CFL_WRDATA) &&
927 		    (ntohl(fcp->fc_dl) > fcoe_ddp_min))
928 			return true;
929 	}
930 	return false;
931 }
932 
933 /**
934  * fcoe_em_config() - Allocate and configure an exchange manager
935  * @lport: The local port that the new EM will be associated with
936  *
937  * Returns: 0 on success
938  */
939 static inline int fcoe_em_config(struct fc_lport *lport)
940 {
941 	struct fcoe_port *port = lport_priv(lport);
942 	struct fcoe_interface *fcoe = port->priv;
943 	struct fcoe_interface *oldfcoe = NULL;
944 	struct net_device *old_real_dev, *cur_real_dev;
945 	u16 min_xid = FCOE_MIN_XID;
946 	u16 max_xid = FCOE_MAX_XID;
947 
948 	/*
949 	 * Check if need to allocate an em instance for
950 	 * offload exchange ids to be shared across all VN_PORTs/lport.
951 	 */
952 	if (!lport->lro_enabled || !lport->lro_xid ||
953 	    (lport->lro_xid >= max_xid)) {
954 		lport->lro_xid = 0;
955 		goto skip_oem;
956 	}
957 
958 	/*
959 	 * Reuse existing offload em instance in case
960 	 * it is already allocated on real eth device
961 	 */
962 	if (is_vlan_dev(fcoe->netdev))
963 		cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
964 	else
965 		cur_real_dev = fcoe->netdev;
966 
967 	list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
968 		if (is_vlan_dev(oldfcoe->netdev))
969 			old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
970 		else
971 			old_real_dev = oldfcoe->netdev;
972 
973 		if (cur_real_dev == old_real_dev) {
974 			fcoe->oem = oldfcoe->oem;
975 			break;
976 		}
977 	}
978 
979 	if (fcoe->oem) {
980 		if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
981 			printk(KERN_ERR "fcoe_em_config: failed to add "
982 			       "offload em:%p on interface:%s\n",
983 			       fcoe->oem, fcoe->netdev->name);
984 			return -ENOMEM;
985 		}
986 	} else {
987 		fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
988 					      FCOE_MIN_XID, lport->lro_xid,
989 					      fcoe_oem_match);
990 		if (!fcoe->oem) {
991 			printk(KERN_ERR "fcoe_em_config: failed to allocate "
992 			       "em for offload exches on interface:%s\n",
993 			       fcoe->netdev->name);
994 			return -ENOMEM;
995 		}
996 	}
997 
998 	/*
999 	 * Exclude offload EM xid range from next EM xid range.
1000 	 */
1001 	min_xid += lport->lro_xid + 1;
1002 
1003 skip_oem:
1004 	if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
1005 		printk(KERN_ERR "fcoe_em_config: failed to "
1006 		       "allocate em on interface %s\n", fcoe->netdev->name);
1007 		return -ENOMEM;
1008 	}
1009 
1010 	return 0;
1011 }
1012 
1013 /**
1014  * fcoe_if_destroy() - Tear down a SW FCoE instance
1015  * @lport: The local port to be destroyed
1016  *
1017  */
1018 static void fcoe_if_destroy(struct fc_lport *lport)
1019 {
1020 	struct fcoe_port *port = lport_priv(lport);
1021 	struct fcoe_interface *fcoe = port->priv;
1022 	struct net_device *netdev = fcoe->netdev;
1023 
1024 	FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
1025 
1026 	/* Logout of the fabric */
1027 	fc_fabric_logoff(lport);
1028 
1029 	/* Cleanup the fc_lport */
1030 	fc_lport_destroy(lport);
1031 
1032 	/* Stop the transmit retry timer */
1033 	del_timer_sync(&port->timer);
1034 
1035 	/* Free existing transmit skbs */
1036 	fcoe_clean_pending_queue(lport);
1037 
1038 	rtnl_lock();
1039 	if (!is_zero_ether_addr(port->data_src_addr))
1040 		dev_uc_del(netdev, port->data_src_addr);
1041 	if (lport->vport)
1042 		synchronize_net();
1043 	else
1044 		fcoe_interface_remove(fcoe);
1045 	rtnl_unlock();
1046 
1047 	/* Free queued packets for the per-CPU receive threads */
1048 	fcoe_percpu_clean(lport);
1049 
1050 	/* Detach from the scsi-ml */
1051 	fc_remove_host(lport->host);
1052 	scsi_remove_host(lport->host);
1053 
1054 	/* Destroy lport scsi_priv */
1055 	fc_fcp_destroy(lport);
1056 
1057 	/* There are no more rports or I/O, free the EM */
1058 	fc_exch_mgr_free(lport);
1059 
1060 	/* Free memory used by statistical counters */
1061 	fc_lport_free_stats(lport);
1062 
1063 	/*
1064 	 * Release the Scsi_Host for vport but hold on to
1065 	 * master lport until it fcoe interface fully cleaned-up.
1066 	 */
1067 	if (lport->vport)
1068 		scsi_host_put(lport->host);
1069 }
1070 
1071 /**
1072  * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
1073  * @lport: The local port to setup DDP for
1074  * @xid:   The exchange ID for this DDP transfer
1075  * @sgl:   The scatterlist describing this transfer
1076  * @sgc:   The number of sg items
1077  *
1078  * Returns: 0 if the DDP context was not configured
1079  */
1080 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
1081 			  struct scatterlist *sgl, unsigned int sgc)
1082 {
1083 	struct net_device *netdev = fcoe_netdev(lport);
1084 
1085 	if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
1086 		return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
1087 							      xid, sgl,
1088 							      sgc);
1089 
1090 	return 0;
1091 }
1092 
1093 /**
1094  * fcoe_ddp_target() - Call a LLD's ddp_target through the net device
1095  * @lport: The local port to setup DDP for
1096  * @xid:   The exchange ID for this DDP transfer
1097  * @sgl:   The scatterlist describing this transfer
1098  * @sgc:   The number of sg items
1099  *
1100  * Returns: 0 if the DDP context was not configured
1101  */
1102 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid,
1103 			   struct scatterlist *sgl, unsigned int sgc)
1104 {
1105 	struct net_device *netdev = fcoe_netdev(lport);
1106 
1107 	if (netdev->netdev_ops->ndo_fcoe_ddp_target)
1108 		return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid,
1109 							       sgl, sgc);
1110 
1111 	return 0;
1112 }
1113 
1114 
1115 /**
1116  * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
1117  * @lport: The local port to complete DDP on
1118  * @xid:   The exchange ID for this DDP transfer
1119  *
1120  * Returns: the length of data that have been completed by DDP
1121  */
1122 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
1123 {
1124 	struct net_device *netdev = fcoe_netdev(lport);
1125 
1126 	if (netdev->netdev_ops->ndo_fcoe_ddp_done)
1127 		return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
1128 	return 0;
1129 }
1130 
1131 /**
1132  * fcoe_if_create() - Create a FCoE instance on an interface
1133  * @fcoe:   The FCoE interface to create a local port on
1134  * @parent: The device pointer to be the parent in sysfs for the SCSI host
1135  * @npiv:   Indicates if the port is a vport or not
1136  *
1137  * Creates a fc_lport instance and a Scsi_Host instance and configure them.
1138  *
1139  * Returns: The allocated fc_lport or an error pointer
1140  */
1141 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
1142 				       struct device *parent, int npiv)
1143 {
1144 	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1145 	struct net_device *netdev = fcoe->netdev;
1146 	struct fc_lport *lport, *n_port;
1147 	struct fcoe_port *port;
1148 	struct Scsi_Host *shost;
1149 	int rc;
1150 	/*
1151 	 * parent is only a vport if npiv is 1,
1152 	 * but we'll only use vport in that case so go ahead and set it
1153 	 */
1154 	struct fc_vport *vport = dev_to_vport(parent);
1155 
1156 	FCOE_NETDEV_DBG(netdev, "Create Interface\n");
1157 
1158 	if (!npiv)
1159 		lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port));
1160 	else
1161 		lport = libfc_vport_create(vport, sizeof(*port));
1162 
1163 	if (!lport) {
1164 		FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
1165 		rc = -ENOMEM;
1166 		goto out;
1167 	}
1168 	port = lport_priv(lport);
1169 	port->lport = lport;
1170 	port->priv = fcoe;
1171 	port->get_netdev = fcoe_netdev;
1172 	port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
1173 	port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
1174 	INIT_WORK(&port->destroy_work, fcoe_destroy_work);
1175 
1176 	/*
1177 	 * Need to add the lport to the hostlist
1178 	 * so we catch NETDEV_CHANGE events.
1179 	 */
1180 	fcoe_hostlist_add(lport);
1181 
1182 	/* configure a fc_lport including the exchange manager */
1183 	rc = fcoe_lport_config(lport);
1184 	if (rc) {
1185 		FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
1186 				"interface\n");
1187 		goto out_host_put;
1188 	}
1189 
1190 	if (npiv) {
1191 		FCOE_NETDEV_DBG(netdev, "Setting vport names, "
1192 				"%16.16llx %16.16llx\n",
1193 				vport->node_name, vport->port_name);
1194 		fc_set_wwnn(lport, vport->node_name);
1195 		fc_set_wwpn(lport, vport->port_name);
1196 	}
1197 
1198 	/* configure lport network properties */
1199 	rc = fcoe_netdev_config(lport, netdev);
1200 	if (rc) {
1201 		FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
1202 				"interface\n");
1203 		goto out_lp_destroy;
1204 	}
1205 
1206 	/* configure lport scsi host properties */
1207 	rc = fcoe_shost_config(lport, parent);
1208 	if (rc) {
1209 		FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
1210 				"interface\n");
1211 		goto out_lp_destroy;
1212 	}
1213 
1214 	/* Initialize the library */
1215 	rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1);
1216 	if (rc) {
1217 		FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
1218 				"interface\n");
1219 		goto out_lp_destroy;
1220 	}
1221 
1222 	/* Initialized FDMI information */
1223 	fcoe_fdmi_info(lport, netdev);
1224 
1225 	/*
1226 	 * fcoe_em_alloc() and fcoe_hostlist_add() both
1227 	 * need to be atomic with respect to other changes to the
1228 	 * hostlist since fcoe_em_alloc() looks for an existing EM
1229 	 * instance on host list updated by fcoe_hostlist_add().
1230 	 *
1231 	 * This is currently handled through the fcoe_config_mutex
1232 	 * begin held.
1233 	 */
1234 	if (!npiv)
1235 		/* lport exch manager allocation */
1236 		rc = fcoe_em_config(lport);
1237 	else {
1238 		shost = vport_to_shost(vport);
1239 		n_port = shost_priv(shost);
1240 		rc = fc_exch_mgr_list_clone(n_port, lport);
1241 	}
1242 
1243 	if (rc) {
1244 		FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n");
1245 		goto out_lp_destroy;
1246 	}
1247 
1248 	return lport;
1249 
1250 out_lp_destroy:
1251 	fc_exch_mgr_free(lport);
1252 out_host_put:
1253 	fcoe_hostlist_del(lport);
1254 	scsi_host_put(lport->host);
1255 out:
1256 	return ERR_PTR(rc);
1257 }
1258 
1259 /**
1260  * fcoe_if_init() - Initialization routine for fcoe.ko
1261  *
1262  * Attaches the SW FCoE transport to the FC transport
1263  *
1264  * Returns: 0 on success
1265  */
1266 static int __init fcoe_if_init(void)
1267 {
1268 	/* attach to scsi transport */
1269 	fcoe_nport_scsi_transport =
1270 		fc_attach_transport(&fcoe_nport_fc_functions);
1271 	fcoe_vport_scsi_transport =
1272 		fc_attach_transport(&fcoe_vport_fc_functions);
1273 
1274 	if (!fcoe_nport_scsi_transport) {
1275 		printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
1276 		return -ENODEV;
1277 	}
1278 
1279 	return 0;
1280 }
1281 
1282 /**
1283  * fcoe_if_exit() - Tear down fcoe.ko
1284  *
1285  * Detaches the SW FCoE transport from the FC transport
1286  *
1287  * Returns: 0 on success
1288  */
1289 static int __exit fcoe_if_exit(void)
1290 {
1291 	fc_release_transport(fcoe_nport_scsi_transport);
1292 	fc_release_transport(fcoe_vport_scsi_transport);
1293 	fcoe_nport_scsi_transport = NULL;
1294 	fcoe_vport_scsi_transport = NULL;
1295 	return 0;
1296 }
1297 
1298 static void fcoe_thread_cleanup_local(unsigned int cpu)
1299 {
1300 	struct page *crc_eof;
1301 	struct fcoe_percpu_s *p;
1302 
1303 	p = per_cpu_ptr(&fcoe_percpu, cpu);
1304 	spin_lock_bh(&p->fcoe_rx_list.lock);
1305 	crc_eof = p->crc_eof_page;
1306 	p->crc_eof_page = NULL;
1307 	p->crc_eof_offset = 0;
1308 	spin_unlock_bh(&p->fcoe_rx_list.lock);
1309 
1310 	if (crc_eof)
1311 		put_page(crc_eof);
1312 	flush_work(&p->work);
1313 }
1314 
1315 /**
1316  * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming
1317  *			command.
1318  *
1319  * This routine selects next CPU based on cpumask to distribute
1320  * incoming requests in round robin.
1321  *
1322  * Returns: int CPU number
1323  */
1324 static inline unsigned int fcoe_select_cpu(void)
1325 {
1326 	static unsigned int selected_cpu;
1327 
1328 	selected_cpu = cpumask_next(selected_cpu, cpu_online_mask);
1329 	if (selected_cpu >= nr_cpu_ids)
1330 		selected_cpu = cpumask_first(cpu_online_mask);
1331 
1332 	return selected_cpu;
1333 }
1334 
1335 /**
1336  * fcoe_rcv() - Receive packets from a net device
1337  * @skb:    The received packet
1338  * @netdev: The net device that the packet was received on
1339  * @ptype:  The packet type context
1340  * @olddev: The last device net device
1341  *
1342  * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
1343  * FC frame and passes the frame to libfc.
1344  *
1345  * Returns: 0 for success
1346  */
1347 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
1348 	     struct packet_type *ptype, struct net_device *olddev)
1349 {
1350 	struct fc_lport *lport;
1351 	struct fcoe_rcv_info *fr;
1352 	struct fcoe_ctlr *ctlr;
1353 	struct fcoe_interface *fcoe;
1354 	struct fc_frame_header *fh;
1355 	struct fcoe_percpu_s *fps;
1356 	struct ethhdr *eh;
1357 	unsigned int cpu;
1358 
1359 	fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
1360 	ctlr = fcoe_to_ctlr(fcoe);
1361 	lport = ctlr->lp;
1362 	if (unlikely(!lport)) {
1363 		FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n");
1364 		goto err2;
1365 	}
1366 	if (!lport->link_up)
1367 		goto err2;
1368 
1369 	FCOE_NETDEV_DBG(netdev,
1370 			"skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1371 			skb->len, skb->data_len, skb->head, skb->data,
1372 			skb_tail_pointer(skb), skb_end_pointer(skb),
1373 			skb->csum, skb->dev ? skb->dev->name : "<NULL>");
1374 
1375 
1376 	skb = skb_share_check(skb, GFP_ATOMIC);
1377 
1378 	if (skb == NULL)
1379 		return NET_RX_DROP;
1380 
1381 	eh = eth_hdr(skb);
1382 
1383 	if (is_fip_mode(ctlr) &&
1384 	    !ether_addr_equal(eh->h_source, ctlr->dest_addr)) {
1385 		FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
1386 				eh->h_source);
1387 		goto err;
1388 	}
1389 
1390 	/*
1391 	 * Check for minimum frame length, and make sure required FCoE
1392 	 * and FC headers are pulled into the linear data area.
1393 	 */
1394 	if (unlikely((skb->len < FCOE_MIN_FRAME) ||
1395 		     !pskb_may_pull(skb, FCOE_HEADER_LEN)))
1396 		goto err;
1397 
1398 	skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
1399 	fh = (struct fc_frame_header *) skb_transport_header(skb);
1400 
1401 	if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
1402 		FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
1403 				eh->h_dest);
1404 		goto err;
1405 	}
1406 
1407 	fr = fcoe_dev_from_skb(skb);
1408 	fr->fr_dev = lport;
1409 
1410 	/*
1411 	 * In case the incoming frame's exchange is originated from
1412 	 * the initiator, then received frame's exchange id is ANDed
1413 	 * with fc_cpu_mask bits to get the same cpu on which exchange
1414 	 * was originated, otherwise select cpu using rx exchange id
1415 	 * or fcoe_select_cpu().
1416 	 */
1417 	if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
1418 		cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
1419 	else {
1420 		if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
1421 			cpu = fcoe_select_cpu();
1422 		else
1423 			cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
1424 	}
1425 
1426 	if (cpu >= nr_cpu_ids)
1427 		goto err;
1428 
1429 	fps = &per_cpu(fcoe_percpu, cpu);
1430 	spin_lock(&fps->fcoe_rx_list.lock);
1431 	/*
1432 	 * We now have a valid CPU that we're targeting for
1433 	 * this skb. We also have this receive thread locked,
1434 	 * so we're free to queue skbs into it's queue.
1435 	 */
1436 
1437 	/*
1438 	 * Note: We used to have a set of conditions under which we would
1439 	 * call fcoe_recv_frame directly, rather than queuing to the rx list
1440 	 * as it could save a few cycles, but doing so is prohibited, as
1441 	 * fcoe_recv_frame has several paths that may sleep, which is forbidden
1442 	 * in softirq context.
1443 	 */
1444 	__skb_queue_tail(&fps->fcoe_rx_list, skb);
1445 	schedule_work_on(cpu, &fps->work);
1446 	spin_unlock(&fps->fcoe_rx_list.lock);
1447 
1448 	return NET_RX_SUCCESS;
1449 err:
1450 	per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++;
1451 	put_cpu();
1452 err2:
1453 	kfree_skb(skb);
1454 	return NET_RX_DROP;
1455 }
1456 
1457 /**
1458  * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC
1459  * @skb:  The packet to be transmitted
1460  * @tlen: The total length of the trailer
1461  *
1462  * Returns: 0 for success
1463  */
1464 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
1465 {
1466 	struct fcoe_percpu_s *fps;
1467 	int rc;
1468 
1469 	fps = &get_cpu_var(fcoe_percpu);
1470 	rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
1471 	put_cpu_var(fcoe_percpu);
1472 
1473 	return rc;
1474 }
1475 
1476 /**
1477  * fcoe_xmit() - Transmit a FCoE frame
1478  * @lport: The local port that the frame is to be transmitted for
1479  * @fp:	   The frame to be transmitted
1480  *
1481  * Return: 0 for success
1482  */
1483 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
1484 {
1485 	int wlen;
1486 	u32 crc;
1487 	struct ethhdr *eh;
1488 	struct fcoe_crc_eof *cp;
1489 	struct sk_buff *skb;
1490 	struct fc_stats *stats;
1491 	struct fc_frame_header *fh;
1492 	unsigned int hlen;		/* header length implies the version */
1493 	unsigned int tlen;		/* trailer length */
1494 	unsigned int elen;		/* eth header, may include vlan */
1495 	struct fcoe_port *port = lport_priv(lport);
1496 	struct fcoe_interface *fcoe = port->priv;
1497 	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1498 	u8 sof, eof;
1499 	struct fcoe_hdr *hp;
1500 
1501 	WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1502 
1503 	fh = fc_frame_header_get(fp);
1504 	skb = fp_skb(fp);
1505 	wlen = skb->len / FCOE_WORD_TO_BYTE;
1506 
1507 	if (!lport->link_up) {
1508 		kfree_skb(skb);
1509 		return 0;
1510 	}
1511 
1512 	if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
1513 	    fcoe_ctlr_els_send(ctlr, lport, skb))
1514 		return 0;
1515 
1516 	sof = fr_sof(fp);
1517 	eof = fr_eof(fp);
1518 
1519 	elen = sizeof(struct ethhdr);
1520 	hlen = sizeof(struct fcoe_hdr);
1521 	tlen = sizeof(struct fcoe_crc_eof);
1522 	wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1523 
1524 	/* crc offload */
1525 	if (likely(lport->crc_offload)) {
1526 		skb->ip_summed = CHECKSUM_PARTIAL;
1527 		skb->csum_start = skb_headroom(skb);
1528 		skb->csum_offset = skb->len;
1529 		crc = 0;
1530 	} else {
1531 		skb->ip_summed = CHECKSUM_NONE;
1532 		crc = fcoe_fc_crc(fp);
1533 	}
1534 
1535 	/* copy port crc and eof to the skb buff */
1536 	if (skb_is_nonlinear(skb)) {
1537 		skb_frag_t *frag;
1538 		if (fcoe_alloc_paged_crc_eof(skb, tlen)) {
1539 			kfree_skb(skb);
1540 			return -ENOMEM;
1541 		}
1542 		frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1543 		cp = kmap_atomic(skb_frag_page(frag))
1544 			+ frag->page_offset;
1545 	} else {
1546 		cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
1547 	}
1548 
1549 	memset(cp, 0, sizeof(*cp));
1550 	cp->fcoe_eof = eof;
1551 	cp->fcoe_crc32 = cpu_to_le32(~crc);
1552 
1553 	if (skb_is_nonlinear(skb)) {
1554 		kunmap_atomic(cp);
1555 		cp = NULL;
1556 	}
1557 
1558 	/* adjust skb network/transport offsets to match mac/fcoe/port */
1559 	skb_push(skb, elen + hlen);
1560 	skb_reset_mac_header(skb);
1561 	skb_reset_network_header(skb);
1562 	skb->mac_len = elen;
1563 	skb->protocol = htons(ETH_P_FCOE);
1564 	skb->priority = fcoe->priority;
1565 
1566 	if (is_vlan_dev(fcoe->netdev) &&
1567 	    fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) {
1568 		/* must set skb->dev before calling vlan_put_tag */
1569 		skb->dev = fcoe->realdev;
1570 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1571 				       vlan_dev_vlan_id(fcoe->netdev));
1572 	} else
1573 		skb->dev = fcoe->netdev;
1574 
1575 	/* fill up mac and fcoe headers */
1576 	eh = eth_hdr(skb);
1577 	eh->h_proto = htons(ETH_P_FCOE);
1578 	memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN);
1579 	if (ctlr->map_dest)
1580 		memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
1581 
1582 	if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN))
1583 		memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN);
1584 	else
1585 		memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
1586 
1587 	hp = (struct fcoe_hdr *)(eh + 1);
1588 	memset(hp, 0, sizeof(*hp));
1589 	if (FC_FCOE_VER)
1590 		FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1591 	hp->fcoe_sof = sof;
1592 
1593 	/* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1594 	if (lport->seq_offload && fr_max_payload(fp)) {
1595 		skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1596 		skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1597 	} else {
1598 		skb_shinfo(skb)->gso_type = 0;
1599 		skb_shinfo(skb)->gso_size = 0;
1600 	}
1601 	/* update tx stats: regardless if LLD fails */
1602 	stats = per_cpu_ptr(lport->stats, get_cpu());
1603 	stats->TxFrames++;
1604 	stats->TxWords += wlen;
1605 	put_cpu();
1606 
1607 	/* send down to lld */
1608 	fr_dev(fp) = lport;
1609 	fcoe_port_send(port, skb);
1610 	return 0;
1611 }
1612 
1613 /**
1614  * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC
1615  * @lport: The local port the frame was received on
1616  * @fp:	   The received frame
1617  *
1618  * Return: 0 on passing filtering checks
1619  */
1620 static inline int fcoe_filter_frames(struct fc_lport *lport,
1621 				     struct fc_frame *fp)
1622 {
1623 	struct fcoe_ctlr *ctlr;
1624 	struct fcoe_interface *fcoe;
1625 	struct fc_frame_header *fh;
1626 	struct sk_buff *skb = (struct sk_buff *)fp;
1627 	struct fc_stats *stats;
1628 
1629 	/*
1630 	 * We only check CRC if no offload is available and if it is
1631 	 * it's solicited data, in which case, the FCP layer would
1632 	 * check it during the copy.
1633 	 */
1634 	if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1635 		fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1636 	else
1637 		fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1638 
1639 	fh = (struct fc_frame_header *) skb_transport_header(skb);
1640 	fh = fc_frame_header_get(fp);
1641 	if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
1642 		return 0;
1643 
1644 	fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
1645 	ctlr = fcoe_to_ctlr(fcoe);
1646 	if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
1647 	    ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
1648 		FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
1649 		return -EINVAL;
1650 	}
1651 
1652 	if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) ||
1653 	    le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) {
1654 		fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1655 		return 0;
1656 	}
1657 
1658 	stats = per_cpu_ptr(lport->stats, get_cpu());
1659 	stats->InvalidCRCCount++;
1660 	if (stats->InvalidCRCCount < 5)
1661 		printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
1662 	put_cpu();
1663 	return -EINVAL;
1664 }
1665 
1666 /**
1667  * fcoe_recv_frame() - process a single received frame
1668  * @skb: frame to process
1669  */
1670 static void fcoe_recv_frame(struct sk_buff *skb)
1671 {
1672 	u32 fr_len;
1673 	struct fc_lport *lport;
1674 	struct fcoe_rcv_info *fr;
1675 	struct fc_stats *stats;
1676 	struct fcoe_crc_eof crc_eof;
1677 	struct fc_frame *fp;
1678 	struct fcoe_port *port;
1679 	struct fcoe_hdr *hp;
1680 
1681 	fr = fcoe_dev_from_skb(skb);
1682 	lport = fr->fr_dev;
1683 	if (unlikely(!lport)) {
1684 		FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n");
1685 		kfree_skb(skb);
1686 		return;
1687 	}
1688 
1689 	FCOE_NETDEV_DBG(skb->dev,
1690 			"skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1691 			skb->len, skb->data_len,
1692 			skb->head, skb->data, skb_tail_pointer(skb),
1693 			skb_end_pointer(skb), skb->csum,
1694 			skb->dev ? skb->dev->name : "<NULL>");
1695 
1696 	port = lport_priv(lport);
1697 	skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */
1698 
1699 	/*
1700 	 * Frame length checks and setting up the header pointers
1701 	 * was done in fcoe_rcv already.
1702 	 */
1703 	hp = (struct fcoe_hdr *) skb_network_header(skb);
1704 
1705 	stats = per_cpu_ptr(lport->stats, get_cpu());
1706 	if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1707 		if (stats->ErrorFrames < 5)
1708 			printk(KERN_WARNING "fcoe: FCoE version "
1709 			       "mismatch: The frame has "
1710 			       "version %x, but the "
1711 			       "initiator supports version "
1712 			       "%x\n", FC_FCOE_DECAPS_VER(hp),
1713 			       FC_FCOE_VER);
1714 		goto drop;
1715 	}
1716 
1717 	skb_pull(skb, sizeof(struct fcoe_hdr));
1718 	fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1719 
1720 	stats->RxFrames++;
1721 	stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1722 
1723 	fp = (struct fc_frame *)skb;
1724 	fc_frame_init(fp);
1725 	fr_dev(fp) = lport;
1726 	fr_sof(fp) = hp->fcoe_sof;
1727 
1728 	/* Copy out the CRC and EOF trailer for access */
1729 	if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
1730 		goto drop;
1731 	fr_eof(fp) = crc_eof.fcoe_eof;
1732 	fr_crc(fp) = crc_eof.fcoe_crc32;
1733 	if (pskb_trim(skb, fr_len))
1734 		goto drop;
1735 
1736 	if (!fcoe_filter_frames(lport, fp)) {
1737 		put_cpu();
1738 		fc_exch_recv(lport, fp);
1739 		return;
1740 	}
1741 drop:
1742 	stats->ErrorFrames++;
1743 	put_cpu();
1744 	kfree_skb(skb);
1745 }
1746 
1747 /**
1748  * fcoe_receive_work() - The per-CPU worker
1749  * @work: The work struct
1750  *
1751  */
1752 static void fcoe_receive_work(struct work_struct *work)
1753 {
1754 	struct fcoe_percpu_s *p;
1755 	struct sk_buff *skb;
1756 	struct sk_buff_head tmp;
1757 
1758 	p = container_of(work, struct fcoe_percpu_s, work);
1759 	skb_queue_head_init(&tmp);
1760 
1761 	spin_lock_bh(&p->fcoe_rx_list.lock);
1762 	skb_queue_splice_init(&p->fcoe_rx_list, &tmp);
1763 	spin_unlock_bh(&p->fcoe_rx_list.lock);
1764 
1765 	if (!skb_queue_len(&tmp))
1766 		return;
1767 
1768 	while ((skb = __skb_dequeue(&tmp)))
1769 		fcoe_recv_frame(skb);
1770 }
1771 
1772 /**
1773  * fcoe_dev_setup() - Setup the link change notification interface
1774  */
1775 static void fcoe_dev_setup(void)
1776 {
1777 	register_dcbevent_notifier(&dcb_notifier);
1778 	register_netdevice_notifier(&fcoe_notifier);
1779 }
1780 
1781 /**
1782  * fcoe_dev_cleanup() - Cleanup the link change notification interface
1783  */
1784 static void fcoe_dev_cleanup(void)
1785 {
1786 	unregister_dcbevent_notifier(&dcb_notifier);
1787 	unregister_netdevice_notifier(&fcoe_notifier);
1788 }
1789 
1790 static struct fcoe_interface *
1791 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev)
1792 {
1793 	struct fcoe_interface *fcoe;
1794 	struct net_device *real_dev;
1795 
1796 	list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1797 		if (is_vlan_dev(fcoe->netdev))
1798 			real_dev = vlan_dev_real_dev(fcoe->netdev);
1799 		else
1800 			real_dev = fcoe->netdev;
1801 
1802 		if (netdev == real_dev)
1803 			return fcoe;
1804 	}
1805 	return NULL;
1806 }
1807 
1808 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
1809 				     ulong event, void *ptr)
1810 {
1811 	struct dcb_app_type *entry = ptr;
1812 	struct fcoe_ctlr *ctlr;
1813 	struct fcoe_interface *fcoe;
1814 	struct net_device *netdev;
1815 	int prio;
1816 
1817 	if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE)
1818 		return NOTIFY_OK;
1819 
1820 	netdev = dev_get_by_index(&init_net, entry->ifindex);
1821 	if (!netdev)
1822 		return NOTIFY_OK;
1823 
1824 	fcoe = fcoe_hostlist_lookup_realdev_port(netdev);
1825 	dev_put(netdev);
1826 	if (!fcoe)
1827 		return NOTIFY_OK;
1828 
1829 	ctlr = fcoe_to_ctlr(fcoe);
1830 
1831 	if (entry->dcbx & DCB_CAP_DCBX_VER_CEE)
1832 		prio = ffs(entry->app.priority) - 1;
1833 	else
1834 		prio = entry->app.priority;
1835 
1836 	if (prio < 0)
1837 		return NOTIFY_OK;
1838 
1839 	if (entry->app.protocol == ETH_P_FIP ||
1840 	    entry->app.protocol == ETH_P_FCOE)
1841 		ctlr->priority = prio;
1842 
1843 	if (entry->app.protocol == ETH_P_FCOE)
1844 		fcoe->priority = prio;
1845 
1846 	return NOTIFY_OK;
1847 }
1848 
1849 /**
1850  * fcoe_device_notification() - Handler for net device events
1851  * @notifier: The context of the notification
1852  * @event:    The type of event
1853  * @ptr:      The net device that the event was on
1854  *
1855  * This function is called by the Ethernet driver in case of link change event.
1856  *
1857  * Returns: 0 for success
1858  */
1859 static int fcoe_device_notification(struct notifier_block *notifier,
1860 				    ulong event, void *ptr)
1861 {
1862 	struct fcoe_ctlr_device *cdev;
1863 	struct fc_lport *lport = NULL;
1864 	struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1865 	struct fcoe_ctlr *ctlr;
1866 	struct fcoe_interface *fcoe;
1867 	struct fcoe_port *port;
1868 	struct fc_stats *stats;
1869 	u32 link_possible = 1;
1870 	u32 mfs;
1871 	int rc = NOTIFY_OK;
1872 
1873 	list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1874 		if (fcoe->netdev == netdev) {
1875 			ctlr = fcoe_to_ctlr(fcoe);
1876 			lport = ctlr->lp;
1877 			break;
1878 		}
1879 	}
1880 	if (!lport) {
1881 		rc = NOTIFY_DONE;
1882 		goto out;
1883 	}
1884 
1885 	switch (event) {
1886 	case NETDEV_DOWN:
1887 	case NETDEV_GOING_DOWN:
1888 		link_possible = 0;
1889 		break;
1890 	case NETDEV_UP:
1891 	case NETDEV_CHANGE:
1892 		break;
1893 	case NETDEV_CHANGEMTU:
1894 		if (netdev->features & NETIF_F_FCOE_MTU)
1895 			break;
1896 		mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
1897 				     sizeof(struct fcoe_crc_eof));
1898 		if (mfs >= FC_MIN_MAX_FRAME)
1899 			fc_set_mfs(lport, mfs);
1900 		break;
1901 	case NETDEV_REGISTER:
1902 		break;
1903 	case NETDEV_UNREGISTER:
1904 		list_del(&fcoe->list);
1905 		port = lport_priv(ctlr->lp);
1906 		queue_work(fcoe_wq, &port->destroy_work);
1907 		goto out;
1908 		break;
1909 	case NETDEV_FEAT_CHANGE:
1910 		fcoe_netdev_features_change(lport, netdev);
1911 		break;
1912 	default:
1913 		FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
1914 				"from netdev netlink\n", event);
1915 	}
1916 
1917 	fcoe_link_speed_update(lport);
1918 
1919 	cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
1920 
1921 	if (link_possible && !fcoe_link_ok(lport)) {
1922 		switch (cdev->enabled) {
1923 		case FCOE_CTLR_DISABLED:
1924 			pr_info("Link up while interface is disabled.\n");
1925 			break;
1926 		case FCOE_CTLR_ENABLED:
1927 		case FCOE_CTLR_UNUSED:
1928 			fcoe_ctlr_link_up(ctlr);
1929 		};
1930 	} else if (fcoe_ctlr_link_down(ctlr)) {
1931 		switch (cdev->enabled) {
1932 		case FCOE_CTLR_DISABLED:
1933 			pr_info("Link down while interface is disabled.\n");
1934 			break;
1935 		case FCOE_CTLR_ENABLED:
1936 		case FCOE_CTLR_UNUSED:
1937 			stats = per_cpu_ptr(lport->stats, get_cpu());
1938 			stats->LinkFailureCount++;
1939 			put_cpu();
1940 			fcoe_clean_pending_queue(lport);
1941 		};
1942 	}
1943 out:
1944 	return rc;
1945 }
1946 
1947 /**
1948  * fcoe_disable() - Disables a FCoE interface
1949  * @netdev  : The net_device object the Ethernet interface to create on
1950  *
1951  * Called from fcoe transport.
1952  *
1953  * Returns: 0 for success
1954  *
1955  * Deprecated: use fcoe_ctlr_enabled()
1956  */
1957 static int fcoe_disable(struct net_device *netdev)
1958 {
1959 	struct fcoe_ctlr *ctlr;
1960 	struct fcoe_interface *fcoe;
1961 	int rc = 0;
1962 
1963 	mutex_lock(&fcoe_config_mutex);
1964 
1965 	rtnl_lock();
1966 	fcoe = fcoe_hostlist_lookup_port(netdev);
1967 	rtnl_unlock();
1968 
1969 	if (fcoe) {
1970 		ctlr = fcoe_to_ctlr(fcoe);
1971 		fcoe_ctlr_link_down(ctlr);
1972 		fcoe_clean_pending_queue(ctlr->lp);
1973 	} else
1974 		rc = -ENODEV;
1975 
1976 	mutex_unlock(&fcoe_config_mutex);
1977 	return rc;
1978 }
1979 
1980 /**
1981  * fcoe_enable() - Enables a FCoE interface
1982  * @netdev  : The net_device object the Ethernet interface to create on
1983  *
1984  * Called from fcoe transport.
1985  *
1986  * Returns: 0 for success
1987  */
1988 static int fcoe_enable(struct net_device *netdev)
1989 {
1990 	struct fcoe_ctlr *ctlr;
1991 	struct fcoe_interface *fcoe;
1992 	int rc = 0;
1993 
1994 	mutex_lock(&fcoe_config_mutex);
1995 	rtnl_lock();
1996 	fcoe = fcoe_hostlist_lookup_port(netdev);
1997 	rtnl_unlock();
1998 
1999 	if (!fcoe) {
2000 		rc = -ENODEV;
2001 		goto out;
2002 	}
2003 
2004 	ctlr = fcoe_to_ctlr(fcoe);
2005 
2006 	if (!fcoe_link_ok(ctlr->lp))
2007 		fcoe_ctlr_link_up(ctlr);
2008 
2009 out:
2010 	mutex_unlock(&fcoe_config_mutex);
2011 	return rc;
2012 }
2013 
2014 /**
2015  * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller
2016  * @cdev: The FCoE Controller that is being enabled or disabled
2017  *
2018  * fcoe_sysfs will ensure that the state of 'enabled' has
2019  * changed, so no checking is necessary here. This routine simply
2020  * calls fcoe_enable or fcoe_disable, both of which are deprecated.
2021  * When those routines are removed the functionality can be merged
2022  * here.
2023  */
2024 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
2025 {
2026 	struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev);
2027 	struct fc_lport *lport = ctlr->lp;
2028 	struct net_device *netdev = fcoe_netdev(lport);
2029 
2030 	switch (cdev->enabled) {
2031 	case FCOE_CTLR_ENABLED:
2032 		return fcoe_enable(netdev);
2033 	case FCOE_CTLR_DISABLED:
2034 		return fcoe_disable(netdev);
2035 	case FCOE_CTLR_UNUSED:
2036 	default:
2037 		return -ENOTSUPP;
2038 	};
2039 }
2040 
2041 /**
2042  * fcoe_ctlr_mode() - Switch FIP mode
2043  * @cdev: The FCoE Controller that is being modified
2044  *
2045  * When the FIP mode has been changed we need to update
2046  * the multicast addresses to ensure we get the correct
2047  * frames.
2048  */
2049 static void fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev)
2050 {
2051 	struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2052 	struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2053 
2054 	if (ctlr_dev->mode == FIP_CONN_TYPE_VN2VN &&
2055 	    ctlr->mode != FIP_MODE_VN2VN) {
2056 		dev_mc_del(fcoe->netdev, FIP_ALL_ENODE_MACS);
2057 		dev_mc_add(fcoe->netdev, FIP_ALL_VN2VN_MACS);
2058 		dev_mc_add(fcoe->netdev, FIP_ALL_P2P_MACS);
2059 	} else if (ctlr->mode != FIP_MODE_FABRIC) {
2060 		dev_mc_del(fcoe->netdev, FIP_ALL_VN2VN_MACS);
2061 		dev_mc_del(fcoe->netdev, FIP_ALL_P2P_MACS);
2062 		dev_mc_add(fcoe->netdev, FIP_ALL_ENODE_MACS);
2063 	}
2064 	fcoe_ctlr_set_fip_mode(ctlr_dev);
2065 }
2066 
2067 /**
2068  * fcoe_destroy() - Destroy a FCoE interface
2069  * @netdev  : The net_device object the Ethernet interface to create on
2070  *
2071  * Called from fcoe transport
2072  *
2073  * Returns: 0 for success
2074  */
2075 static int fcoe_destroy(struct net_device *netdev)
2076 {
2077 	struct fcoe_ctlr *ctlr;
2078 	struct fcoe_interface *fcoe;
2079 	struct fc_lport *lport;
2080 	struct fcoe_port *port;
2081 	int rc = 0;
2082 
2083 	mutex_lock(&fcoe_config_mutex);
2084 	rtnl_lock();
2085 	fcoe = fcoe_hostlist_lookup_port(netdev);
2086 	if (!fcoe) {
2087 		rc = -ENODEV;
2088 		goto out_nodev;
2089 	}
2090 	ctlr = fcoe_to_ctlr(fcoe);
2091 	lport = ctlr->lp;
2092 	port = lport_priv(lport);
2093 	list_del(&fcoe->list);
2094 	queue_work(fcoe_wq, &port->destroy_work);
2095 out_nodev:
2096 	rtnl_unlock();
2097 	mutex_unlock(&fcoe_config_mutex);
2098 	return rc;
2099 }
2100 
2101 /**
2102  * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
2103  * @work: Handle to the FCoE port to be destroyed
2104  */
2105 static void fcoe_destroy_work(struct work_struct *work)
2106 {
2107 	struct fcoe_ctlr_device *cdev;
2108 	struct fcoe_ctlr *ctlr;
2109 	struct fcoe_port *port;
2110 	struct fcoe_interface *fcoe;
2111 	struct Scsi_Host *shost;
2112 	struct fc_host_attrs *fc_host;
2113 	unsigned long flags;
2114 	struct fc_vport *vport;
2115 	struct fc_vport *next_vport;
2116 
2117 	port = container_of(work, struct fcoe_port, destroy_work);
2118 	shost = port->lport->host;
2119 	fc_host = shost_to_fc_host(shost);
2120 
2121 	/* Loop through all the vports and mark them for deletion */
2122 	spin_lock_irqsave(shost->host_lock, flags);
2123 	list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2124 		if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
2125 			continue;
2126 		} else {
2127 			vport->flags |= FC_VPORT_DELETING;
2128 			queue_work(fc_host_work_q(shost),
2129 				   &vport->vport_delete_work);
2130 		}
2131 	}
2132 	spin_unlock_irqrestore(shost->host_lock, flags);
2133 
2134 	flush_workqueue(fc_host_work_q(shost));
2135 
2136 	mutex_lock(&fcoe_config_mutex);
2137 
2138 	fcoe = port->priv;
2139 	ctlr = fcoe_to_ctlr(fcoe);
2140 	cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2141 
2142 	fcoe_if_destroy(port->lport);
2143 	fcoe_interface_cleanup(fcoe);
2144 
2145 	mutex_unlock(&fcoe_config_mutex);
2146 
2147 	fcoe_ctlr_device_delete(cdev);
2148 }
2149 
2150 /**
2151  * fcoe_match() - Check if the FCoE is supported on the given netdevice
2152  * @netdev  : The net_device object the Ethernet interface to create on
2153  *
2154  * Called from fcoe transport.
2155  *
2156  * Returns: always returns true as this is the default FCoE transport,
2157  * i.e., support all netdevs.
2158  */
2159 static bool fcoe_match(struct net_device *netdev)
2160 {
2161 	return true;
2162 }
2163 
2164 /**
2165  * fcoe_dcb_create() - Initialize DCB attributes and hooks
2166  * @netdev: The net_device object of the L2 link that should be queried
2167  * @port: The fcoe_port to bind FCoE APP priority with
2168  * @
2169  */
2170 static void fcoe_dcb_create(struct fcoe_interface *fcoe)
2171 {
2172 	int ctlr_prio = TC_PRIO_BESTEFFORT;
2173 	int fcoe_prio = TC_PRIO_INTERACTIVE;
2174 	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2175 #ifdef CONFIG_DCB
2176 	int dcbx;
2177 	u8 fup, up;
2178 	struct net_device *netdev = fcoe->realdev;
2179 	struct dcb_app app = {
2180 				.priority = 0,
2181 				.protocol = ETH_P_FCOE
2182 			     };
2183 
2184 	/* setup DCB priority attributes. */
2185 	if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) {
2186 		dcbx = netdev->dcbnl_ops->getdcbx(netdev);
2187 
2188 		if (dcbx & DCB_CAP_DCBX_VER_IEEE) {
2189 			app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
2190 			up = dcb_ieee_getapp_mask(netdev, &app);
2191 			app.protocol = ETH_P_FIP;
2192 			fup = dcb_ieee_getapp_mask(netdev, &app);
2193 		} else {
2194 			app.selector = DCB_APP_IDTYPE_ETHTYPE;
2195 			up = dcb_getapp(netdev, &app);
2196 			app.protocol = ETH_P_FIP;
2197 			fup = dcb_getapp(netdev, &app);
2198 		}
2199 
2200 		fcoe_prio = ffs(up) ? ffs(up) - 1 : 0;
2201 		ctlr_prio = ffs(fup) ? ffs(fup) - 1 : fcoe_prio;
2202 	}
2203 #endif
2204 	fcoe->priority = fcoe_prio;
2205 	ctlr->priority = ctlr_prio;
2206 }
2207 
2208 enum fcoe_create_link_state {
2209 	FCOE_CREATE_LINK_DOWN,
2210 	FCOE_CREATE_LINK_UP,
2211 };
2212 
2213 /**
2214  * _fcoe_create() - (internal) Create a fcoe interface
2215  * @netdev  :   The net_device object the Ethernet interface to create on
2216  * @fip_mode:   The FIP mode for this creation
2217  * @link_state: The ctlr link state on creation
2218  *
2219  * Called from either the libfcoe 'create' module parameter
2220  * via fcoe_create or from fcoe_syfs's ctlr_create file.
2221  *
2222  * libfcoe's 'create' module parameter is deprecated so some
2223  * consolidation of code can be done when that interface is
2224  * removed.
2225  */
2226 static int _fcoe_create(struct net_device *netdev, enum fip_mode fip_mode,
2227 			enum fcoe_create_link_state link_state)
2228 {
2229 	int rc = 0;
2230 	struct fcoe_ctlr_device *ctlr_dev;
2231 	struct fcoe_ctlr *ctlr;
2232 	struct fcoe_interface *fcoe;
2233 	struct fc_lport *lport;
2234 
2235 	mutex_lock(&fcoe_config_mutex);
2236 	rtnl_lock();
2237 
2238 	/* look for existing lport */
2239 	if (fcoe_hostlist_lookup(netdev)) {
2240 		rc = -EEXIST;
2241 		goto out_nodev;
2242 	}
2243 
2244 	fcoe = fcoe_interface_create(netdev, fip_mode);
2245 	if (IS_ERR(fcoe)) {
2246 		rc = PTR_ERR(fcoe);
2247 		goto out_nodev;
2248 	}
2249 
2250 	ctlr = fcoe_to_ctlr(fcoe);
2251 	ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr);
2252 	lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0);
2253 	if (IS_ERR(lport)) {
2254 		printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
2255 		       netdev->name);
2256 		rc = -EIO;
2257 		rtnl_unlock();
2258 		fcoe_interface_cleanup(fcoe);
2259 		mutex_unlock(&fcoe_config_mutex);
2260 		fcoe_ctlr_device_delete(ctlr_dev);
2261 		goto out;
2262 	}
2263 
2264 	/* Make this the "master" N_Port */
2265 	ctlr->lp = lport;
2266 
2267 	/* setup DCB priority attributes. */
2268 	fcoe_dcb_create(fcoe);
2269 
2270 	/* start FIP Discovery and FLOGI */
2271 	lport->boot_time = jiffies;
2272 	fc_fabric_login(lport);
2273 
2274 	/*
2275 	 * If the fcoe_ctlr_device is to be set to DISABLED
2276 	 * it must be done after the lport is added to the
2277 	 * hostlist, but before the rtnl_lock is released.
2278 	 * This is because the rtnl_lock protects the
2279 	 * hostlist that fcoe_device_notification uses. If
2280 	 * the FCoE Controller is intended to be created
2281 	 * DISABLED then 'enabled' needs to be considered
2282 	 * handling link events. 'enabled' must be set
2283 	 * before the lport can be found in the hostlist
2284 	 * when a link up event is received.
2285 	 */
2286 	if (link_state == FCOE_CREATE_LINK_UP)
2287 		ctlr_dev->enabled = FCOE_CTLR_ENABLED;
2288 	else
2289 		ctlr_dev->enabled = FCOE_CTLR_DISABLED;
2290 
2291 	if (link_state == FCOE_CREATE_LINK_UP &&
2292 	    !fcoe_link_ok(lport)) {
2293 		rtnl_unlock();
2294 		fcoe_ctlr_link_up(ctlr);
2295 		mutex_unlock(&fcoe_config_mutex);
2296 		return rc;
2297 	}
2298 
2299 out_nodev:
2300 	rtnl_unlock();
2301 	mutex_unlock(&fcoe_config_mutex);
2302 out:
2303 	return rc;
2304 }
2305 
2306 /**
2307  * fcoe_create() - Create a fcoe interface
2308  * @netdev  : The net_device object the Ethernet interface to create on
2309  * @fip_mode: The FIP mode for this creation
2310  *
2311  * Called from fcoe transport
2312  *
2313  * Returns: 0 for success
2314  */
2315 static int fcoe_create(struct net_device *netdev, enum fip_mode fip_mode)
2316 {
2317 	return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
2318 }
2319 
2320 /**
2321  * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs
2322  * @netdev: The net_device to be used by the allocated FCoE Controller
2323  *
2324  * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr
2325  * in a link_down state. The allows the user an opportunity to configure
2326  * the FCoE Controller from sysfs before enabling the FCoE Controller.
2327  *
2328  * Creating in with this routine starts the FCoE Controller in Fabric
2329  * mode. The user can change to VN2VN or another mode before enabling.
2330  */
2331 static int fcoe_ctlr_alloc(struct net_device *netdev)
2332 {
2333 	return _fcoe_create(netdev, FIP_MODE_FABRIC,
2334 			    FCOE_CREATE_LINK_DOWN);
2335 }
2336 
2337 /**
2338  * fcoe_link_ok() - Check if the link is OK for a local port
2339  * @lport: The local port to check link on
2340  *
2341  * Returns: 0 if link is UP and OK, -1 if not
2342  *
2343  */
2344 static int fcoe_link_ok(struct fc_lport *lport)
2345 {
2346 	struct net_device *netdev = fcoe_netdev(lport);
2347 
2348 	if (netif_oper_up(netdev))
2349 		return 0;
2350 	return -1;
2351 }
2352 
2353 /**
2354  * fcoe_percpu_clean() - Clear all pending skbs for an local port
2355  * @lport: The local port whose skbs are to be cleared
2356  *
2357  * Must be called with fcoe_create_mutex held to single-thread completion.
2358  *
2359  * This flushes the pending skbs by flush the work item for each CPU. The work
2360  * item on each possible CPU is flushed because we may have used the per-CPU
2361  * struct of an offline CPU.
2362  */
2363 static void fcoe_percpu_clean(struct fc_lport *lport)
2364 {
2365 	struct fcoe_percpu_s *pp;
2366 	unsigned int cpu;
2367 
2368 	for_each_possible_cpu(cpu) {
2369 		pp = &per_cpu(fcoe_percpu, cpu);
2370 
2371 		flush_work(&pp->work);
2372 	}
2373 }
2374 
2375 /**
2376  * fcoe_reset() - Reset a local port
2377  * @shost: The SCSI host associated with the local port to be reset
2378  *
2379  * Returns: Always 0 (return value required by FC transport template)
2380  */
2381 static int fcoe_reset(struct Scsi_Host *shost)
2382 {
2383 	struct fc_lport *lport = shost_priv(shost);
2384 	struct fcoe_port *port = lport_priv(lport);
2385 	struct fcoe_interface *fcoe = port->priv;
2386 	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2387 	struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2388 
2389 	fcoe_ctlr_link_down(ctlr);
2390 	fcoe_clean_pending_queue(ctlr->lp);
2391 
2392 	if (cdev->enabled != FCOE_CTLR_DISABLED &&
2393 	    !fcoe_link_ok(ctlr->lp))
2394 		fcoe_ctlr_link_up(ctlr);
2395 	return 0;
2396 }
2397 
2398 /**
2399  * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
2400  * @netdev: The net device used as a key
2401  *
2402  * Locking: Must be called with the RNL mutex held.
2403  *
2404  * Returns: NULL or the FCoE interface
2405  */
2406 static struct fcoe_interface *
2407 fcoe_hostlist_lookup_port(const struct net_device *netdev)
2408 {
2409 	struct fcoe_interface *fcoe;
2410 
2411 	list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2412 		if (fcoe->netdev == netdev)
2413 			return fcoe;
2414 	}
2415 	return NULL;
2416 }
2417 
2418 /**
2419  * fcoe_hostlist_lookup() - Find the local port associated with a
2420  *			    given net device
2421  * @netdev: The netdevice used as a key
2422  *
2423  * Locking: Must be called with the RTNL mutex held
2424  *
2425  * Returns: NULL or the local port
2426  */
2427 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
2428 {
2429 	struct fcoe_ctlr *ctlr;
2430 	struct fcoe_interface *fcoe;
2431 
2432 	fcoe = fcoe_hostlist_lookup_port(netdev);
2433 	ctlr = fcoe_to_ctlr(fcoe);
2434 	return (fcoe) ? ctlr->lp : NULL;
2435 }
2436 
2437 /**
2438  * fcoe_hostlist_add() - Add the FCoE interface identified by a local
2439  *			 port to the hostlist
2440  * @lport: The local port that identifies the FCoE interface to be added
2441  *
2442  * Locking: must be called with the RTNL mutex held
2443  *
2444  * Returns: 0 for success
2445  */
2446 static int fcoe_hostlist_add(const struct fc_lport *lport)
2447 {
2448 	struct fcoe_interface *fcoe;
2449 	struct fcoe_port *port;
2450 
2451 	fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
2452 	if (!fcoe) {
2453 		port = lport_priv(lport);
2454 		fcoe = port->priv;
2455 		list_add_tail(&fcoe->list, &fcoe_hostlist);
2456 	}
2457 	return 0;
2458 }
2459 
2460 /**
2461  * fcoe_hostlist_del() - Remove the FCoE interface identified by a local
2462  *			 port to the hostlist
2463  * @lport: The local port that identifies the FCoE interface to be added
2464  *
2465  * Locking: must be called with the RTNL mutex held
2466  *
2467  */
2468 static void fcoe_hostlist_del(const struct fc_lport *lport)
2469 {
2470 	struct fcoe_interface *fcoe;
2471 	struct fcoe_port *port;
2472 
2473 	port = lport_priv(lport);
2474 	fcoe = port->priv;
2475 	list_del(&fcoe->list);
2476 	return;
2477 }
2478 
2479 static struct fcoe_transport fcoe_sw_transport = {
2480 	.name = {FCOE_TRANSPORT_DEFAULT},
2481 	.attached = false,
2482 	.list = LIST_HEAD_INIT(fcoe_sw_transport.list),
2483 	.match = fcoe_match,
2484 	.alloc = fcoe_ctlr_alloc,
2485 	.create = fcoe_create,
2486 	.destroy = fcoe_destroy,
2487 	.enable = fcoe_enable,
2488 	.disable = fcoe_disable,
2489 };
2490 
2491 /**
2492  * fcoe_init() - Initialize fcoe.ko
2493  *
2494  * Returns: 0 on success, or a negative value on failure
2495  */
2496 static int __init fcoe_init(void)
2497 {
2498 	struct fcoe_percpu_s *p;
2499 	unsigned int cpu;
2500 	int rc = 0;
2501 
2502 	fcoe_wq = alloc_workqueue("fcoe", 0, 0);
2503 	if (!fcoe_wq)
2504 		return -ENOMEM;
2505 
2506 	/* register as a fcoe transport */
2507 	rc = fcoe_transport_attach(&fcoe_sw_transport);
2508 	if (rc) {
2509 		printk(KERN_ERR "failed to register an fcoe transport, check "
2510 			"if libfcoe is loaded\n");
2511 		goto out_destroy;
2512 	}
2513 
2514 	mutex_lock(&fcoe_config_mutex);
2515 
2516 	for_each_possible_cpu(cpu) {
2517 		p = per_cpu_ptr(&fcoe_percpu, cpu);
2518 		INIT_WORK(&p->work, fcoe_receive_work);
2519 		skb_queue_head_init(&p->fcoe_rx_list);
2520 	}
2521 
2522 	/* Setup link change notification */
2523 	fcoe_dev_setup();
2524 
2525 	rc = fcoe_if_init();
2526 	if (rc)
2527 		goto out_free;
2528 
2529 	mutex_unlock(&fcoe_config_mutex);
2530 	return 0;
2531 
2532 out_free:
2533 	mutex_unlock(&fcoe_config_mutex);
2534 out_destroy:
2535 	destroy_workqueue(fcoe_wq);
2536 	return rc;
2537 }
2538 module_init(fcoe_init);
2539 
2540 /**
2541  * fcoe_exit() - Clean up fcoe.ko
2542  *
2543  * Returns: 0 on success or a  negative value on failure
2544  */
2545 static void __exit fcoe_exit(void)
2546 {
2547 	struct fcoe_interface *fcoe, *tmp;
2548 	struct fcoe_ctlr *ctlr;
2549 	struct fcoe_port *port;
2550 	unsigned int cpu;
2551 
2552 	mutex_lock(&fcoe_config_mutex);
2553 
2554 	fcoe_dev_cleanup();
2555 
2556 	/* releases the associated fcoe hosts */
2557 	rtnl_lock();
2558 	list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
2559 		ctlr = fcoe_to_ctlr(fcoe);
2560 		port = lport_priv(ctlr->lp);
2561 		fcoe_hostlist_del(port->lport);
2562 		queue_work(fcoe_wq, &port->destroy_work);
2563 	}
2564 	rtnl_unlock();
2565 
2566 	for_each_possible_cpu(cpu)
2567 		fcoe_thread_cleanup_local(cpu);
2568 
2569 	mutex_unlock(&fcoe_config_mutex);
2570 
2571 	/*
2572 	 * destroy_work's may be chained but destroy_workqueue()
2573 	 * can take care of them. Just kill the fcoe_wq.
2574 	 */
2575 	destroy_workqueue(fcoe_wq);
2576 
2577 	/*
2578 	 * Detaching from the scsi transport must happen after all
2579 	 * destroys are done on the fcoe_wq. destroy_workqueue will
2580 	 * enusre the fcoe_wq is flushed.
2581 	 */
2582 	fcoe_if_exit();
2583 
2584 	/* detach from fcoe transport */
2585 	fcoe_transport_detach(&fcoe_sw_transport);
2586 }
2587 module_exit(fcoe_exit);
2588 
2589 /**
2590  * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
2591  * @seq: active sequence in the FLOGI or FDISC exchange
2592  * @fp: response frame, or error encoded in a pointer (timeout)
2593  * @arg: pointer the the fcoe_ctlr structure
2594  *
2595  * This handles MAC address management for FCoE, then passes control on to
2596  * the libfc FLOGI response handler.
2597  */
2598 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2599 {
2600 	struct fcoe_ctlr *fip = arg;
2601 	struct fc_exch *exch = fc_seq_exch(seq);
2602 	struct fc_lport *lport = exch->lp;
2603 	u8 *mac;
2604 
2605 	if (IS_ERR(fp))
2606 		goto done;
2607 
2608 	mac = fr_cb(fp)->granted_mac;
2609 	/* pre-FIP */
2610 	if (is_zero_ether_addr(mac))
2611 		fcoe_ctlr_recv_flogi(fip, lport, fp);
2612 	if (!is_zero_ether_addr(mac))
2613 		fcoe_update_src_mac(lport, mac);
2614 done:
2615 	fc_lport_flogi_resp(seq, fp, lport);
2616 }
2617 
2618 /**
2619  * fcoe_logo_resp() - FCoE specific LOGO response handler
2620  * @seq: active sequence in the LOGO exchange
2621  * @fp: response frame, or error encoded in a pointer (timeout)
2622  * @arg: pointer the the fcoe_ctlr structure
2623  *
2624  * This handles MAC address management for FCoE, then passes control on to
2625  * the libfc LOGO response handler.
2626  */
2627 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2628 {
2629 	struct fc_lport *lport = arg;
2630 	static u8 zero_mac[ETH_ALEN] = { 0 };
2631 
2632 	if (!IS_ERR(fp))
2633 		fcoe_update_src_mac(lport, zero_mac);
2634 	fc_lport_logo_resp(seq, fp, lport);
2635 }
2636 
2637 /**
2638  * fcoe_elsct_send - FCoE specific ELS handler
2639  *
2640  * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
2641  * using FCoE specific response handlers and passing the FIP controller as
2642  * the argument (the lport is still available from the exchange).
2643  *
2644  * Most of the work here is just handed off to the libfc routine.
2645  */
2646 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
2647 				      struct fc_frame *fp, unsigned int op,
2648 				      void (*resp)(struct fc_seq *,
2649 						   struct fc_frame *,
2650 						   void *),
2651 				      void *arg, u32 timeout)
2652 {
2653 	struct fcoe_port *port = lport_priv(lport);
2654 	struct fcoe_interface *fcoe = port->priv;
2655 	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
2656 	struct fc_frame_header *fh = fc_frame_header_get(fp);
2657 
2658 	switch (op) {
2659 	case ELS_FLOGI:
2660 	case ELS_FDISC:
2661 		if (lport->point_to_multipoint)
2662 			break;
2663 		return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
2664 				     fip, timeout);
2665 	case ELS_LOGO:
2666 		/* only hook onto fabric logouts, not port logouts */
2667 		if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
2668 			break;
2669 		return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
2670 				     lport, timeout);
2671 	}
2672 	return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
2673 }
2674 
2675 /**
2676  * fcoe_vport_create() - create an fc_host/scsi_host for a vport
2677  * @vport: fc_vport object to create a new fc_host for
2678  * @disabled: start the new fc_host in a disabled state by default?
2679  *
2680  * Returns: 0 for success
2681  */
2682 static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
2683 {
2684 	struct Scsi_Host *shost = vport_to_shost(vport);
2685 	struct fc_lport *n_port = shost_priv(shost);
2686 	struct fcoe_port *port = lport_priv(n_port);
2687 	struct fcoe_interface *fcoe = port->priv;
2688 	struct net_device *netdev = fcoe->netdev;
2689 	struct fc_lport *vn_port;
2690 	int rc;
2691 	char buf[32];
2692 
2693 	rc = fcoe_validate_vport_create(vport);
2694 	if (rc) {
2695 		fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
2696 		printk(KERN_ERR "fcoe: Failed to create vport, "
2697 			"WWPN (0x%s) already exists\n",
2698 			buf);
2699 		return rc;
2700 	}
2701 
2702 	mutex_lock(&fcoe_config_mutex);
2703 	rtnl_lock();
2704 	vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
2705 	rtnl_unlock();
2706 	mutex_unlock(&fcoe_config_mutex);
2707 
2708 	if (IS_ERR(vn_port)) {
2709 		printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
2710 		       netdev->name);
2711 		return -EIO;
2712 	}
2713 
2714 	if (disabled) {
2715 		fc_vport_set_state(vport, FC_VPORT_DISABLED);
2716 	} else {
2717 		vn_port->boot_time = jiffies;
2718 		fc_fabric_login(vn_port);
2719 		fc_vport_setlink(vn_port);
2720 	}
2721 	return 0;
2722 }
2723 
2724 /**
2725  * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
2726  * @vport: fc_vport object that is being destroyed
2727  *
2728  * Returns: 0 for success
2729  */
2730 static int fcoe_vport_destroy(struct fc_vport *vport)
2731 {
2732 	struct Scsi_Host *shost = vport_to_shost(vport);
2733 	struct fc_lport *n_port = shost_priv(shost);
2734 	struct fc_lport *vn_port = vport->dd_data;
2735 
2736 	mutex_lock(&n_port->lp_mutex);
2737 	list_del(&vn_port->list);
2738 	mutex_unlock(&n_port->lp_mutex);
2739 
2740 	mutex_lock(&fcoe_config_mutex);
2741 	fcoe_if_destroy(vn_port);
2742 	mutex_unlock(&fcoe_config_mutex);
2743 
2744 	return 0;
2745 }
2746 
2747 /**
2748  * fcoe_vport_disable() - change vport state
2749  * @vport: vport to bring online/offline
2750  * @disable: should the vport be disabled?
2751  */
2752 static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
2753 {
2754 	struct fc_lport *lport = vport->dd_data;
2755 
2756 	if (disable) {
2757 		fc_vport_set_state(vport, FC_VPORT_DISABLED);
2758 		fc_fabric_logoff(lport);
2759 	} else {
2760 		lport->boot_time = jiffies;
2761 		fc_fabric_login(lport);
2762 		fc_vport_setlink(lport);
2763 	}
2764 
2765 	return 0;
2766 }
2767 
2768 /**
2769  * fcoe_vport_set_symbolic_name() - append vport string to symbolic name
2770  * @vport: fc_vport with a new symbolic name string
2771  *
2772  * After generating a new symbolic name string, a new RSPN_ID request is
2773  * sent to the name server.  There is no response handler, so if it fails
2774  * for some reason it will not be retried.
2775  */
2776 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
2777 {
2778 	struct fc_lport *lport = vport->dd_data;
2779 	struct fc_frame *fp;
2780 	size_t len;
2781 
2782 	snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
2783 		 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
2784 		 fcoe_netdev(lport)->name, vport->symbolic_name);
2785 
2786 	if (lport->state != LPORT_ST_READY)
2787 		return;
2788 
2789 	len = strnlen(fc_host_symbolic_name(lport->host), 255);
2790 	fp = fc_frame_alloc(lport,
2791 			    sizeof(struct fc_ct_hdr) +
2792 			    sizeof(struct fc_ns_rspn) + len);
2793 	if (!fp)
2794 		return;
2795 	lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
2796 			     NULL, NULL, 3 * lport->r_a_tov);
2797 }
2798 
2799 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev)
2800 {
2801 	struct fcoe_ctlr_device *ctlr_dev =
2802 		fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2803 	struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2804 	struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2805 
2806 	fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev);
2807 }
2808 
2809 /**
2810  * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
2811  * @lport: the local port
2812  * @port_id: the port ID
2813  * @fp: the received frame, if any, that caused the port_id to be set.
2814  *
2815  * This routine handles the case where we received a FLOGI and are
2816  * entering point-to-point mode.  We need to call fcoe_ctlr_recv_flogi()
2817  * so it can set the non-mapped mode and gateway address.
2818  *
2819  * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
2820  */
2821 static void fcoe_set_port_id(struct fc_lport *lport,
2822 			     u32 port_id, struct fc_frame *fp)
2823 {
2824 	struct fcoe_port *port = lport_priv(lport);
2825 	struct fcoe_interface *fcoe = port->priv;
2826 	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2827 
2828 	if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
2829 		fcoe_ctlr_recv_flogi(ctlr, lport, fp);
2830 }
2831