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 .slave_alloc = fc_slave_alloc,
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->features & NETIF_F_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 del_timer_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_select_cpu() - Selects CPU to handle post-processing of incoming
1304 * command.
1305 *
1306 * This routine selects next CPU based on cpumask to distribute
1307 * incoming requests in round robin.
1308 *
1309 * Returns: int CPU number
1310 */
fcoe_select_cpu(void)1311 static inline unsigned int fcoe_select_cpu(void)
1312 {
1313 static unsigned int selected_cpu;
1314
1315 selected_cpu = cpumask_next(selected_cpu, cpu_online_mask);
1316 if (selected_cpu >= nr_cpu_ids)
1317 selected_cpu = cpumask_first(cpu_online_mask);
1318
1319 return selected_cpu;
1320 }
1321
1322 /**
1323 * fcoe_rcv() - Receive packets from a net device
1324 * @skb: The received packet
1325 * @netdev: The net device that the packet was received on
1326 * @ptype: The packet type context
1327 * @olddev: The last device net device
1328 *
1329 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
1330 * FC frame and passes the frame to libfc.
1331 *
1332 * Returns: 0 for success
1333 */
fcoe_rcv(struct sk_buff * skb,struct net_device * netdev,struct packet_type * ptype,struct net_device * olddev)1334 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
1335 struct packet_type *ptype, struct net_device *olddev)
1336 {
1337 struct fc_lport *lport;
1338 struct fcoe_rcv_info *fr;
1339 struct fcoe_ctlr *ctlr;
1340 struct fcoe_interface *fcoe;
1341 struct fc_frame_header *fh;
1342 struct fcoe_percpu_s *fps;
1343 struct ethhdr *eh;
1344 unsigned int cpu;
1345
1346 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
1347 ctlr = fcoe_to_ctlr(fcoe);
1348 lport = ctlr->lp;
1349 if (unlikely(!lport)) {
1350 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n");
1351 goto err2;
1352 }
1353 if (!lport->link_up)
1354 goto err2;
1355
1356 FCOE_NETDEV_DBG(netdev,
1357 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1358 skb->len, skb->data_len, skb->head, skb->data,
1359 skb_tail_pointer(skb), skb_end_pointer(skb),
1360 skb->csum, skb->dev ? skb->dev->name : "<NULL>");
1361
1362
1363 skb = skb_share_check(skb, GFP_ATOMIC);
1364
1365 if (skb == NULL)
1366 return NET_RX_DROP;
1367
1368 eh = eth_hdr(skb);
1369
1370 if (is_fip_mode(ctlr) &&
1371 !ether_addr_equal(eh->h_source, ctlr->dest_addr)) {
1372 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
1373 eh->h_source);
1374 goto err;
1375 }
1376
1377 /*
1378 * Check for minimum frame length, and make sure required FCoE
1379 * and FC headers are pulled into the linear data area.
1380 */
1381 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
1382 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
1383 goto err;
1384
1385 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
1386 fh = (struct fc_frame_header *) skb_transport_header(skb);
1387
1388 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
1389 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
1390 eh->h_dest);
1391 goto err;
1392 }
1393
1394 fr = fcoe_dev_from_skb(skb);
1395 fr->fr_dev = lport;
1396
1397 /*
1398 * In case the incoming frame's exchange is originated from
1399 * the initiator, then received frame's exchange id is ANDed
1400 * with fc_cpu_mask bits to get the same cpu on which exchange
1401 * was originated, otherwise select cpu using rx exchange id
1402 * or fcoe_select_cpu().
1403 */
1404 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
1405 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
1406 else {
1407 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
1408 cpu = fcoe_select_cpu();
1409 else
1410 cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
1411 }
1412
1413 if (cpu >= nr_cpu_ids)
1414 goto err;
1415
1416 fps = &per_cpu(fcoe_percpu, cpu);
1417 spin_lock(&fps->fcoe_rx_list.lock);
1418 /*
1419 * We now have a valid CPU that we're targeting for
1420 * this skb. We also have this receive thread locked,
1421 * so we're free to queue skbs into it's queue.
1422 */
1423
1424 /*
1425 * Note: We used to have a set of conditions under which we would
1426 * call fcoe_recv_frame directly, rather than queuing to the rx list
1427 * as it could save a few cycles, but doing so is prohibited, as
1428 * fcoe_recv_frame has several paths that may sleep, which is forbidden
1429 * in softirq context.
1430 */
1431 __skb_queue_tail(&fps->fcoe_rx_list, skb);
1432 schedule_work_on(cpu, &fps->work);
1433 spin_unlock(&fps->fcoe_rx_list.lock);
1434
1435 return NET_RX_SUCCESS;
1436 err:
1437 this_cpu_inc(lport->stats->ErrorFrames);
1438 err2:
1439 kfree_skb(skb);
1440 return NET_RX_DROP;
1441 }
1442
1443 /**
1444 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC
1445 * @skb: The packet to be transmitted
1446 * @tlen: The total length of the trailer
1447 *
1448 * Returns: 0 for success
1449 */
fcoe_alloc_paged_crc_eof(struct sk_buff * skb,int tlen)1450 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
1451 {
1452 struct fcoe_percpu_s *fps;
1453 int rc;
1454
1455 local_lock(&fcoe_percpu.lock);
1456 fps = this_cpu_ptr(&fcoe_percpu);
1457 rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
1458 local_unlock(&fcoe_percpu.lock);
1459
1460 return rc;
1461 }
1462
1463 /**
1464 * fcoe_xmit() - Transmit a FCoE frame
1465 * @lport: The local port that the frame is to be transmitted for
1466 * @fp: The frame to be transmitted
1467 *
1468 * Return: 0 for success
1469 */
fcoe_xmit(struct fc_lport * lport,struct fc_frame * fp)1470 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
1471 {
1472 int wlen;
1473 u32 crc;
1474 struct ethhdr *eh;
1475 struct fcoe_crc_eof *cp;
1476 struct sk_buff *skb;
1477 struct fc_frame_header *fh;
1478 unsigned int hlen; /* header length implies the version */
1479 unsigned int tlen; /* trailer length */
1480 unsigned int elen; /* eth header, may include vlan */
1481 struct fcoe_port *port = lport_priv(lport);
1482 struct fcoe_interface *fcoe = port->priv;
1483 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1484 u8 sof, eof;
1485 struct fcoe_hdr *hp;
1486
1487 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1488
1489 fh = fc_frame_header_get(fp);
1490 skb = fp_skb(fp);
1491
1492 if (!lport->link_up) {
1493 kfree_skb(skb);
1494 return 0;
1495 }
1496
1497 if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
1498 fcoe_ctlr_els_send(ctlr, lport, skb))
1499 return 0;
1500
1501 sof = fr_sof(fp);
1502 eof = fr_eof(fp);
1503
1504 elen = sizeof(struct ethhdr);
1505 hlen = sizeof(struct fcoe_hdr);
1506 tlen = sizeof(struct fcoe_crc_eof);
1507 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1508
1509 /* crc offload */
1510 if (likely(lport->crc_offload)) {
1511 skb->ip_summed = CHECKSUM_PARTIAL;
1512 skb->csum_start = skb_headroom(skb);
1513 skb->csum_offset = skb->len;
1514 crc = 0;
1515 } else {
1516 skb->ip_summed = CHECKSUM_NONE;
1517 crc = fcoe_fc_crc(fp);
1518 }
1519
1520 /* copy port crc and eof to the skb buff */
1521 if (skb_is_nonlinear(skb)) {
1522 skb_frag_t *frag;
1523 if (fcoe_alloc_paged_crc_eof(skb, tlen)) {
1524 kfree_skb(skb);
1525 return -ENOMEM;
1526 }
1527 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1528 cp = kmap_atomic(skb_frag_page(frag)) + skb_frag_off(frag);
1529 } else {
1530 cp = skb_put(skb, tlen);
1531 }
1532
1533 memset(cp, 0, sizeof(*cp));
1534 cp->fcoe_eof = eof;
1535 cp->fcoe_crc32 = cpu_to_le32(~crc);
1536
1537 if (skb_is_nonlinear(skb)) {
1538 kunmap_atomic(cp);
1539 cp = NULL;
1540 }
1541
1542 /* adjust skb network/transport offsets to match mac/fcoe/port */
1543 skb_push(skb, elen + hlen);
1544 skb_reset_mac_header(skb);
1545 skb_reset_network_header(skb);
1546 skb->mac_len = elen;
1547 skb->protocol = htons(ETH_P_FCOE);
1548 skb->priority = fcoe->priority;
1549
1550 if (is_vlan_dev(fcoe->netdev) &&
1551 fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) {
1552 /* must set skb->dev before calling vlan_put_tag */
1553 skb->dev = fcoe->realdev;
1554 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1555 vlan_dev_vlan_id(fcoe->netdev));
1556 } else
1557 skb->dev = fcoe->netdev;
1558
1559 /* fill up mac and fcoe headers */
1560 eh = eth_hdr(skb);
1561 eh->h_proto = htons(ETH_P_FCOE);
1562 memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN);
1563 if (ctlr->map_dest)
1564 memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
1565
1566 if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN))
1567 memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN);
1568 else
1569 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
1570
1571 hp = (struct fcoe_hdr *)(eh + 1);
1572 memset(hp, 0, sizeof(*hp));
1573 if (FC_FCOE_VER)
1574 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1575 hp->fcoe_sof = sof;
1576
1577 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1578 if (lport->seq_offload && fr_max_payload(fp)) {
1579 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1580 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1581 } else {
1582 skb_shinfo(skb)->gso_type = 0;
1583 skb_shinfo(skb)->gso_size = 0;
1584 }
1585 /* update tx stats: regardless if LLD fails */
1586 this_cpu_inc(lport->stats->TxFrames);
1587 this_cpu_add(lport->stats->TxWords, wlen);
1588
1589 /* send down to lld */
1590 fr_dev(fp) = lport;
1591 fcoe_port_send(port, skb);
1592 return 0;
1593 }
1594
1595 /**
1596 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC
1597 * @lport: The local port the frame was received on
1598 * @fp: The received frame
1599 *
1600 * Return: 0 on passing filtering checks
1601 */
fcoe_filter_frames(struct fc_lport * lport,struct fc_frame * fp)1602 static inline int fcoe_filter_frames(struct fc_lport *lport,
1603 struct fc_frame *fp)
1604 {
1605 struct fcoe_ctlr *ctlr;
1606 struct fcoe_interface *fcoe;
1607 struct fc_frame_header *fh;
1608 struct sk_buff *skb = (struct sk_buff *)fp;
1609
1610 /*
1611 * We only check CRC if no offload is available and if it is
1612 * it's solicited data, in which case, the FCP layer would
1613 * check it during the copy.
1614 */
1615 if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1616 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1617 else
1618 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1619
1620 fh = fc_frame_header_get(fp);
1621 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
1622 return 0;
1623
1624 fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
1625 ctlr = fcoe_to_ctlr(fcoe);
1626 if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
1627 ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
1628 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
1629 return -EINVAL;
1630 }
1631
1632 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) ||
1633 le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) {
1634 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1635 return 0;
1636 }
1637
1638 if (this_cpu_inc_return(lport->stats->InvalidCRCCount) < 5)
1639 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
1640 return -EINVAL;
1641 }
1642
1643 /**
1644 * fcoe_recv_frame() - process a single received frame
1645 * @skb: frame to process
1646 */
fcoe_recv_frame(struct sk_buff * skb)1647 static void fcoe_recv_frame(struct sk_buff *skb)
1648 {
1649 u32 fr_len;
1650 struct fc_lport *lport;
1651 struct fcoe_rcv_info *fr;
1652 struct fcoe_crc_eof crc_eof;
1653 struct fc_frame *fp;
1654 struct fcoe_hdr *hp;
1655
1656 fr = fcoe_dev_from_skb(skb);
1657 lport = fr->fr_dev;
1658 if (unlikely(!lport)) {
1659 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n");
1660 kfree_skb(skb);
1661 return;
1662 }
1663
1664 FCOE_NETDEV_DBG(skb->dev,
1665 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1666 skb->len, skb->data_len,
1667 skb->head, skb->data, skb_tail_pointer(skb),
1668 skb_end_pointer(skb), skb->csum,
1669 skb->dev ? skb->dev->name : "<NULL>");
1670
1671 skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */
1672
1673 /*
1674 * Frame length checks and setting up the header pointers
1675 * was done in fcoe_rcv already.
1676 */
1677 hp = (struct fcoe_hdr *) skb_network_header(skb);
1678
1679 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1680 struct fc_stats *stats;
1681
1682 stats = per_cpu_ptr(lport->stats, raw_smp_processor_id());
1683 if (READ_ONCE(stats->ErrorFrames) < 5)
1684 printk(KERN_WARNING "fcoe: FCoE version "
1685 "mismatch: The frame has "
1686 "version %x, but the "
1687 "initiator supports version "
1688 "%x\n", FC_FCOE_DECAPS_VER(hp),
1689 FC_FCOE_VER);
1690 goto drop;
1691 }
1692
1693 skb_pull(skb, sizeof(struct fcoe_hdr));
1694 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1695
1696 this_cpu_inc(lport->stats->RxFrames);
1697 this_cpu_add(lport->stats->RxWords, fr_len / FCOE_WORD_TO_BYTE);
1698
1699 fp = (struct fc_frame *)skb;
1700 fc_frame_init(fp);
1701 fr_dev(fp) = lport;
1702 fr_sof(fp) = hp->fcoe_sof;
1703
1704 /* Copy out the CRC and EOF trailer for access */
1705 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
1706 goto drop;
1707 fr_eof(fp) = crc_eof.fcoe_eof;
1708 fr_crc(fp) = crc_eof.fcoe_crc32;
1709 if (pskb_trim(skb, fr_len))
1710 goto drop;
1711
1712 if (!fcoe_filter_frames(lport, fp)) {
1713 fc_exch_recv(lport, fp);
1714 return;
1715 }
1716 drop:
1717 this_cpu_inc(lport->stats->ErrorFrames);
1718 kfree_skb(skb);
1719 }
1720
1721 /**
1722 * fcoe_receive_work() - The per-CPU worker
1723 * @work: The work struct
1724 *
1725 */
fcoe_receive_work(struct work_struct * work)1726 static void fcoe_receive_work(struct work_struct *work)
1727 {
1728 struct fcoe_percpu_s *p;
1729 struct sk_buff *skb;
1730 struct sk_buff_head tmp;
1731
1732 p = container_of(work, struct fcoe_percpu_s, work);
1733 skb_queue_head_init(&tmp);
1734
1735 spin_lock_bh(&p->fcoe_rx_list.lock);
1736 skb_queue_splice_init(&p->fcoe_rx_list, &tmp);
1737 spin_unlock_bh(&p->fcoe_rx_list.lock);
1738
1739 if (!skb_queue_len(&tmp))
1740 return;
1741
1742 while ((skb = __skb_dequeue(&tmp)))
1743 fcoe_recv_frame(skb);
1744 }
1745
1746 /**
1747 * fcoe_dev_setup() - Setup the link change notification interface
1748 */
fcoe_dev_setup(void)1749 static void fcoe_dev_setup(void)
1750 {
1751 register_dcbevent_notifier(&dcb_notifier);
1752 register_netdevice_notifier(&fcoe_notifier);
1753 }
1754
1755 /**
1756 * fcoe_dev_cleanup() - Cleanup the link change notification interface
1757 */
fcoe_dev_cleanup(void)1758 static void fcoe_dev_cleanup(void)
1759 {
1760 unregister_dcbevent_notifier(&dcb_notifier);
1761 unregister_netdevice_notifier(&fcoe_notifier);
1762 }
1763
1764 static struct fcoe_interface *
fcoe_hostlist_lookup_realdev_port(struct net_device * netdev)1765 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev)
1766 {
1767 struct fcoe_interface *fcoe;
1768 struct net_device *real_dev;
1769
1770 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1771 if (is_vlan_dev(fcoe->netdev))
1772 real_dev = vlan_dev_real_dev(fcoe->netdev);
1773 else
1774 real_dev = fcoe->netdev;
1775
1776 if (netdev == real_dev)
1777 return fcoe;
1778 }
1779 return NULL;
1780 }
1781
fcoe_dcb_app_notification(struct notifier_block * notifier,ulong event,void * ptr)1782 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
1783 ulong event, void *ptr)
1784 {
1785 struct dcb_app_type *entry = ptr;
1786 struct fcoe_ctlr *ctlr;
1787 struct fcoe_interface *fcoe;
1788 struct net_device *netdev;
1789 int prio;
1790
1791 if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE)
1792 return NOTIFY_OK;
1793
1794 netdev = dev_get_by_index(&init_net, entry->ifindex);
1795 if (!netdev)
1796 return NOTIFY_OK;
1797
1798 fcoe = fcoe_hostlist_lookup_realdev_port(netdev);
1799 dev_put(netdev);
1800 if (!fcoe)
1801 return NOTIFY_OK;
1802
1803 ctlr = fcoe_to_ctlr(fcoe);
1804
1805 if (entry->dcbx & DCB_CAP_DCBX_VER_CEE)
1806 prio = ffs(entry->app.priority) - 1;
1807 else
1808 prio = entry->app.priority;
1809
1810 if (prio < 0)
1811 return NOTIFY_OK;
1812
1813 if (entry->app.protocol == ETH_P_FIP ||
1814 entry->app.protocol == ETH_P_FCOE)
1815 ctlr->priority = prio;
1816
1817 if (entry->app.protocol == ETH_P_FCOE)
1818 fcoe->priority = prio;
1819
1820 return NOTIFY_OK;
1821 }
1822
1823 /**
1824 * fcoe_device_notification() - Handler for net device events
1825 * @notifier: The context of the notification
1826 * @event: The type of event
1827 * @ptr: The net device that the event was on
1828 *
1829 * This function is called by the Ethernet driver in case of link change event.
1830 *
1831 * Returns: 0 for success
1832 */
fcoe_device_notification(struct notifier_block * notifier,ulong event,void * ptr)1833 static int fcoe_device_notification(struct notifier_block *notifier,
1834 ulong event, void *ptr)
1835 {
1836 struct fcoe_ctlr_device *cdev;
1837 struct fc_lport *lport = NULL;
1838 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1839 struct fcoe_ctlr *ctlr;
1840 struct fcoe_interface *fcoe;
1841 u32 link_possible = 1;
1842 u32 mfs;
1843 int rc = NOTIFY_OK;
1844
1845 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1846 if (fcoe->netdev == netdev) {
1847 ctlr = fcoe_to_ctlr(fcoe);
1848 lport = ctlr->lp;
1849 break;
1850 }
1851 }
1852 if (!lport) {
1853 rc = NOTIFY_DONE;
1854 goto out;
1855 }
1856
1857 switch (event) {
1858 case NETDEV_DOWN:
1859 case NETDEV_GOING_DOWN:
1860 link_possible = 0;
1861 break;
1862 case NETDEV_UP:
1863 case NETDEV_CHANGE:
1864 break;
1865 case NETDEV_CHANGEMTU:
1866 if (netdev->features & NETIF_F_FCOE_MTU)
1867 break;
1868 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
1869 sizeof(struct fcoe_crc_eof));
1870 if (mfs >= FC_MIN_MAX_FRAME)
1871 fc_set_mfs(lport, mfs);
1872 break;
1873 case NETDEV_REGISTER:
1874 break;
1875 case NETDEV_UNREGISTER:
1876 list_del(&fcoe->list);
1877 fcoe_vport_remove(lport);
1878 mutex_lock(&fcoe_config_mutex);
1879 fcoe_if_destroy(lport);
1880 if (!fcoe->removed)
1881 fcoe_interface_remove(fcoe);
1882 fcoe_interface_cleanup(fcoe);
1883 mutex_unlock(&fcoe_config_mutex);
1884 fcoe_ctlr_device_delete(fcoe_ctlr_to_ctlr_dev(ctlr));
1885 goto out;
1886 case NETDEV_FEAT_CHANGE:
1887 fcoe_netdev_features_change(lport, netdev);
1888 break;
1889 default:
1890 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
1891 "from netdev netlink\n", event);
1892 }
1893
1894 fcoe_link_speed_update(lport);
1895
1896 cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
1897
1898 if (link_possible && !fcoe_link_ok(lport)) {
1899 switch (cdev->enabled) {
1900 case FCOE_CTLR_DISABLED:
1901 pr_info("Link up while interface is disabled.\n");
1902 break;
1903 case FCOE_CTLR_ENABLED:
1904 case FCOE_CTLR_UNUSED:
1905 fcoe_ctlr_link_up(ctlr);
1906 }
1907 } else if (fcoe_ctlr_link_down(ctlr)) {
1908 switch (cdev->enabled) {
1909 case FCOE_CTLR_DISABLED:
1910 pr_info("Link down while interface is disabled.\n");
1911 break;
1912 case FCOE_CTLR_ENABLED:
1913 case FCOE_CTLR_UNUSED:
1914 this_cpu_inc(lport->stats->LinkFailureCount);
1915 fcoe_clean_pending_queue(lport);
1916 }
1917 }
1918 out:
1919 return rc;
1920 }
1921
1922 /**
1923 * fcoe_disable() - Disables a FCoE interface
1924 * @netdev : The net_device object the Ethernet interface to create on
1925 *
1926 * Called from fcoe transport.
1927 *
1928 * Returns: 0 for success
1929 *
1930 * Deprecated: use fcoe_ctlr_enabled()
1931 */
fcoe_disable(struct net_device * netdev)1932 static int fcoe_disable(struct net_device *netdev)
1933 {
1934 struct fcoe_ctlr *ctlr;
1935 struct fcoe_interface *fcoe;
1936 int rc = 0;
1937
1938 mutex_lock(&fcoe_config_mutex);
1939
1940 rtnl_lock();
1941 fcoe = fcoe_hostlist_lookup_port(netdev);
1942 rtnl_unlock();
1943
1944 if (fcoe) {
1945 ctlr = fcoe_to_ctlr(fcoe);
1946 fcoe_ctlr_link_down(ctlr);
1947 fcoe_clean_pending_queue(ctlr->lp);
1948 } else
1949 rc = -ENODEV;
1950
1951 mutex_unlock(&fcoe_config_mutex);
1952 return rc;
1953 }
1954
1955 /**
1956 * fcoe_enable() - Enables a FCoE interface
1957 * @netdev : The net_device object the Ethernet interface to create on
1958 *
1959 * Called from fcoe transport.
1960 *
1961 * Returns: 0 for success
1962 */
fcoe_enable(struct net_device * netdev)1963 static int fcoe_enable(struct net_device *netdev)
1964 {
1965 struct fcoe_ctlr *ctlr;
1966 struct fcoe_interface *fcoe;
1967 int rc = 0;
1968
1969 mutex_lock(&fcoe_config_mutex);
1970 rtnl_lock();
1971 fcoe = fcoe_hostlist_lookup_port(netdev);
1972 rtnl_unlock();
1973
1974 if (!fcoe) {
1975 rc = -ENODEV;
1976 goto out;
1977 }
1978
1979 ctlr = fcoe_to_ctlr(fcoe);
1980
1981 if (!fcoe_link_ok(ctlr->lp))
1982 fcoe_ctlr_link_up(ctlr);
1983
1984 out:
1985 mutex_unlock(&fcoe_config_mutex);
1986 return rc;
1987 }
1988
1989 /**
1990 * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller
1991 * @cdev: The FCoE Controller that is being enabled or disabled
1992 *
1993 * fcoe_sysfs will ensure that the state of 'enabled' has
1994 * changed, so no checking is necessary here. This routine simply
1995 * calls fcoe_enable or fcoe_disable, both of which are deprecated.
1996 * When those routines are removed the functionality can be merged
1997 * here.
1998 */
fcoe_ctlr_enabled(struct fcoe_ctlr_device * cdev)1999 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
2000 {
2001 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev);
2002 struct fc_lport *lport = ctlr->lp;
2003 struct net_device *netdev = fcoe_netdev(lport);
2004
2005 switch (cdev->enabled) {
2006 case FCOE_CTLR_ENABLED:
2007 return fcoe_enable(netdev);
2008 case FCOE_CTLR_DISABLED:
2009 return fcoe_disable(netdev);
2010 case FCOE_CTLR_UNUSED:
2011 default:
2012 return -ENOTSUPP;
2013 }
2014 }
2015
2016 /**
2017 * fcoe_ctlr_mode() - Switch FIP mode
2018 * @ctlr_dev: The FCoE Controller that is being modified
2019 *
2020 * When the FIP mode has been changed we need to update
2021 * the multicast addresses to ensure we get the correct
2022 * frames.
2023 */
fcoe_ctlr_mode(struct fcoe_ctlr_device * ctlr_dev)2024 static void fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev)
2025 {
2026 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2027 struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2028
2029 if (ctlr_dev->mode == FIP_CONN_TYPE_VN2VN &&
2030 ctlr->mode != FIP_MODE_VN2VN) {
2031 dev_mc_del(fcoe->netdev, FIP_ALL_ENODE_MACS);
2032 dev_mc_add(fcoe->netdev, FIP_ALL_VN2VN_MACS);
2033 dev_mc_add(fcoe->netdev, FIP_ALL_P2P_MACS);
2034 } else if (ctlr->mode != FIP_MODE_FABRIC) {
2035 dev_mc_del(fcoe->netdev, FIP_ALL_VN2VN_MACS);
2036 dev_mc_del(fcoe->netdev, FIP_ALL_P2P_MACS);
2037 dev_mc_add(fcoe->netdev, FIP_ALL_ENODE_MACS);
2038 }
2039 fcoe_ctlr_set_fip_mode(ctlr_dev);
2040 }
2041
2042 /**
2043 * fcoe_destroy() - Destroy a FCoE interface
2044 * @netdev : The net_device object the Ethernet interface to create on
2045 *
2046 * Called from fcoe transport
2047 *
2048 * Returns: 0 for success
2049 */
fcoe_destroy(struct net_device * netdev)2050 static int fcoe_destroy(struct net_device *netdev)
2051 {
2052 struct fcoe_ctlr *ctlr;
2053 struct fcoe_interface *fcoe;
2054 struct fc_lport *lport;
2055 struct fcoe_port *port;
2056 int rc = 0;
2057
2058 mutex_lock(&fcoe_config_mutex);
2059 rtnl_lock();
2060 fcoe = fcoe_hostlist_lookup_port(netdev);
2061 if (!fcoe) {
2062 rc = -ENODEV;
2063 goto out_nodev;
2064 }
2065 ctlr = fcoe_to_ctlr(fcoe);
2066 lport = ctlr->lp;
2067 port = lport_priv(lport);
2068 list_del(&fcoe->list);
2069 queue_work(fcoe_wq, &port->destroy_work);
2070 out_nodev:
2071 rtnl_unlock();
2072 mutex_unlock(&fcoe_config_mutex);
2073 return rc;
2074 }
2075
2076 /**
2077 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
2078 * @work: Handle to the FCoE port to be destroyed
2079 */
fcoe_destroy_work(struct work_struct * work)2080 static void fcoe_destroy_work(struct work_struct *work)
2081 {
2082 struct fcoe_ctlr_device *cdev;
2083 struct fcoe_ctlr *ctlr;
2084 struct fcoe_port *port;
2085 struct fcoe_interface *fcoe;
2086
2087 port = container_of(work, struct fcoe_port, destroy_work);
2088
2089 fcoe_vport_remove(port->lport);
2090
2091 mutex_lock(&fcoe_config_mutex);
2092
2093 fcoe = port->priv;
2094 ctlr = fcoe_to_ctlr(fcoe);
2095 cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2096
2097 rtnl_lock();
2098 fcoe_if_destroy(port->lport);
2099 if (!fcoe->removed)
2100 fcoe_interface_remove(fcoe);
2101 rtnl_unlock();
2102 fcoe_interface_cleanup(fcoe);
2103
2104 mutex_unlock(&fcoe_config_mutex);
2105
2106 fcoe_ctlr_device_delete(cdev);
2107 }
2108
2109 /**
2110 * fcoe_match() - Check if the FCoE is supported on the given netdevice
2111 * @netdev : The net_device object the Ethernet interface to create on
2112 *
2113 * Called from fcoe transport.
2114 *
2115 * Returns: always returns true as this is the default FCoE transport,
2116 * i.e., support all netdevs.
2117 */
fcoe_match(struct net_device * netdev)2118 static bool fcoe_match(struct net_device *netdev)
2119 {
2120 return true;
2121 }
2122
2123 /**
2124 * fcoe_dcb_create() - Initialize DCB attributes and hooks
2125 * @fcoe: The new FCoE interface
2126 */
fcoe_dcb_create(struct fcoe_interface * fcoe)2127 static void fcoe_dcb_create(struct fcoe_interface *fcoe)
2128 {
2129 int ctlr_prio = TC_PRIO_BESTEFFORT;
2130 int fcoe_prio = TC_PRIO_INTERACTIVE;
2131 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2132 #ifdef CONFIG_DCB
2133 int dcbx;
2134 u8 fup, up;
2135 struct net_device *netdev = fcoe->realdev;
2136 struct dcb_app app = {
2137 .priority = 0,
2138 .protocol = ETH_P_FCOE
2139 };
2140
2141 /* setup DCB priority attributes. */
2142 if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) {
2143 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
2144
2145 if (dcbx & DCB_CAP_DCBX_VER_IEEE) {
2146 app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
2147 up = dcb_ieee_getapp_mask(netdev, &app);
2148 app.protocol = ETH_P_FIP;
2149 fup = dcb_ieee_getapp_mask(netdev, &app);
2150 } else {
2151 app.selector = DCB_APP_IDTYPE_ETHTYPE;
2152 up = dcb_getapp(netdev, &app);
2153 app.protocol = ETH_P_FIP;
2154 fup = dcb_getapp(netdev, &app);
2155 }
2156
2157 fcoe_prio = ffs(up) ? ffs(up) - 1 : 0;
2158 ctlr_prio = ffs(fup) ? ffs(fup) - 1 : fcoe_prio;
2159 }
2160 #endif
2161 fcoe->priority = fcoe_prio;
2162 ctlr->priority = ctlr_prio;
2163 }
2164
2165 enum fcoe_create_link_state {
2166 FCOE_CREATE_LINK_DOWN,
2167 FCOE_CREATE_LINK_UP,
2168 };
2169
2170 /**
2171 * _fcoe_create() - (internal) Create a fcoe interface
2172 * @netdev : The net_device object the Ethernet interface to create on
2173 * @fip_mode: The FIP mode for this creation
2174 * @link_state: The ctlr link state on creation
2175 *
2176 * Called from either the libfcoe 'create' module parameter
2177 * via fcoe_create or from fcoe_syfs's ctlr_create file.
2178 *
2179 * libfcoe's 'create' module parameter is deprecated so some
2180 * consolidation of code can be done when that interface is
2181 * removed.
2182 */
_fcoe_create(struct net_device * netdev,enum fip_mode fip_mode,enum fcoe_create_link_state link_state)2183 static int _fcoe_create(struct net_device *netdev, enum fip_mode fip_mode,
2184 enum fcoe_create_link_state link_state)
2185 {
2186 int rc = 0;
2187 struct fcoe_ctlr_device *ctlr_dev;
2188 struct fcoe_ctlr *ctlr;
2189 struct fcoe_interface *fcoe;
2190 struct fc_lport *lport;
2191
2192 mutex_lock(&fcoe_config_mutex);
2193 rtnl_lock();
2194
2195 /* look for existing lport */
2196 if (fcoe_hostlist_lookup(netdev)) {
2197 rc = -EEXIST;
2198 goto out_nodev;
2199 }
2200
2201 fcoe = fcoe_interface_create(netdev, fip_mode);
2202 if (IS_ERR(fcoe)) {
2203 rc = PTR_ERR(fcoe);
2204 goto out_nodev;
2205 }
2206
2207 ctlr = fcoe_to_ctlr(fcoe);
2208 ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr);
2209 lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0);
2210 if (IS_ERR(lport)) {
2211 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
2212 netdev->name);
2213 rc = -EIO;
2214 if (!fcoe->removed)
2215 fcoe_interface_remove(fcoe);
2216 rtnl_unlock();
2217 fcoe_interface_cleanup(fcoe);
2218 mutex_unlock(&fcoe_config_mutex);
2219 fcoe_ctlr_device_delete(ctlr_dev);
2220 return rc;
2221 }
2222
2223 /* Make this the "master" N_Port */
2224 ctlr->lp = lport;
2225
2226 /* setup DCB priority attributes. */
2227 fcoe_dcb_create(fcoe);
2228
2229 /* start FIP Discovery and FLOGI */
2230 lport->boot_time = jiffies;
2231 fc_fabric_login(lport);
2232
2233 /*
2234 * If the fcoe_ctlr_device is to be set to DISABLED
2235 * it must be done after the lport is added to the
2236 * hostlist, but before the rtnl_lock is released.
2237 * This is because the rtnl_lock protects the
2238 * hostlist that fcoe_device_notification uses. If
2239 * the FCoE Controller is intended to be created
2240 * DISABLED then 'enabled' needs to be considered
2241 * handling link events. 'enabled' must be set
2242 * before the lport can be found in the hostlist
2243 * when a link up event is received.
2244 */
2245 if (link_state == FCOE_CREATE_LINK_UP)
2246 ctlr_dev->enabled = FCOE_CTLR_ENABLED;
2247 else
2248 ctlr_dev->enabled = FCOE_CTLR_DISABLED;
2249
2250 if (link_state == FCOE_CREATE_LINK_UP &&
2251 !fcoe_link_ok(lport)) {
2252 rtnl_unlock();
2253 fcoe_ctlr_link_up(ctlr);
2254 mutex_unlock(&fcoe_config_mutex);
2255 return rc;
2256 }
2257
2258 out_nodev:
2259 rtnl_unlock();
2260 mutex_unlock(&fcoe_config_mutex);
2261
2262 return rc;
2263 }
2264
2265 /**
2266 * fcoe_create() - Create a fcoe interface
2267 * @netdev : The net_device object the Ethernet interface to create on
2268 * @fip_mode: The FIP mode for this creation
2269 *
2270 * Called from fcoe transport
2271 *
2272 * Returns: 0 for success
2273 */
fcoe_create(struct net_device * netdev,enum fip_mode fip_mode)2274 static int fcoe_create(struct net_device *netdev, enum fip_mode fip_mode)
2275 {
2276 return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
2277 }
2278
2279 /**
2280 * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs
2281 * @netdev: The net_device to be used by the allocated FCoE Controller
2282 *
2283 * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr
2284 * in a link_down state. The allows the user an opportunity to configure
2285 * the FCoE Controller from sysfs before enabling the FCoE Controller.
2286 *
2287 * Creating in with this routine starts the FCoE Controller in Fabric
2288 * mode. The user can change to VN2VN or another mode before enabling.
2289 */
fcoe_ctlr_alloc(struct net_device * netdev)2290 static int fcoe_ctlr_alloc(struct net_device *netdev)
2291 {
2292 return _fcoe_create(netdev, FIP_MODE_FABRIC,
2293 FCOE_CREATE_LINK_DOWN);
2294 }
2295
2296 /**
2297 * fcoe_link_ok() - Check if the link is OK for a local port
2298 * @lport: The local port to check link on
2299 *
2300 * Returns: 0 if link is UP and OK, -1 if not
2301 *
2302 */
fcoe_link_ok(struct fc_lport * lport)2303 static int fcoe_link_ok(struct fc_lport *lport)
2304 {
2305 struct net_device *netdev = fcoe_netdev(lport);
2306
2307 if (netif_oper_up(netdev))
2308 return 0;
2309 return -1;
2310 }
2311
2312 /**
2313 * fcoe_percpu_clean() - Clear all pending skbs for an local port
2314 * @lport: The local port whose skbs are to be cleared
2315 *
2316 * Must be called with fcoe_create_mutex held to single-thread completion.
2317 *
2318 * This flushes the pending skbs by flush the work item for each CPU. The work
2319 * item on each possible CPU is flushed because we may have used the per-CPU
2320 * struct of an offline CPU.
2321 */
fcoe_percpu_clean(struct fc_lport * lport)2322 static void fcoe_percpu_clean(struct fc_lport *lport)
2323 {
2324 struct fcoe_percpu_s *pp;
2325 unsigned int cpu;
2326
2327 for_each_possible_cpu(cpu) {
2328 pp = &per_cpu(fcoe_percpu, cpu);
2329
2330 flush_work(&pp->work);
2331 }
2332 }
2333
2334 /**
2335 * fcoe_reset() - Reset a local port
2336 * @shost: The SCSI host associated with the local port to be reset
2337 *
2338 * Returns: Always 0 (return value required by FC transport template)
2339 */
fcoe_reset(struct Scsi_Host * shost)2340 static int fcoe_reset(struct Scsi_Host *shost)
2341 {
2342 struct fc_lport *lport = shost_priv(shost);
2343 struct fcoe_port *port = lport_priv(lport);
2344 struct fcoe_interface *fcoe = port->priv;
2345 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2346 struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2347
2348 fcoe_ctlr_link_down(ctlr);
2349 fcoe_clean_pending_queue(ctlr->lp);
2350
2351 if (cdev->enabled != FCOE_CTLR_DISABLED &&
2352 !fcoe_link_ok(ctlr->lp))
2353 fcoe_ctlr_link_up(ctlr);
2354 return 0;
2355 }
2356
2357 /**
2358 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
2359 * @netdev: The net device used as a key
2360 *
2361 * Locking: Must be called with the RNL mutex held.
2362 *
2363 * Returns: NULL or the FCoE interface
2364 */
2365 static struct fcoe_interface *
fcoe_hostlist_lookup_port(const struct net_device * netdev)2366 fcoe_hostlist_lookup_port(const struct net_device *netdev)
2367 {
2368 struct fcoe_interface *fcoe;
2369
2370 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2371 if (fcoe->netdev == netdev)
2372 return fcoe;
2373 }
2374 return NULL;
2375 }
2376
2377 /**
2378 * fcoe_hostlist_lookup() - Find the local port associated with a
2379 * given net device
2380 * @netdev: The netdevice used as a key
2381 *
2382 * Locking: Must be called with the RTNL mutex held
2383 *
2384 * Returns: NULL or the local port
2385 */
fcoe_hostlist_lookup(const struct net_device * netdev)2386 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
2387 {
2388 struct fcoe_ctlr *ctlr;
2389 struct fcoe_interface *fcoe;
2390
2391 fcoe = fcoe_hostlist_lookup_port(netdev);
2392 ctlr = fcoe_to_ctlr(fcoe);
2393 return (fcoe) ? ctlr->lp : NULL;
2394 }
2395
2396 /**
2397 * fcoe_hostlist_add() - Add the FCoE interface identified by a local
2398 * port to the hostlist
2399 * @lport: The local port that identifies the FCoE interface to be added
2400 *
2401 * Locking: must be called with the RTNL mutex held
2402 *
2403 * Returns: 0 for success
2404 */
fcoe_hostlist_add(const struct fc_lport * lport)2405 static int fcoe_hostlist_add(const struct fc_lport *lport)
2406 {
2407 struct fcoe_interface *fcoe;
2408 struct fcoe_port *port;
2409
2410 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
2411 if (!fcoe) {
2412 port = lport_priv(lport);
2413 fcoe = port->priv;
2414 list_add_tail(&fcoe->list, &fcoe_hostlist);
2415 }
2416 return 0;
2417 }
2418
2419 /**
2420 * fcoe_hostlist_del() - Remove the FCoE interface identified by a local
2421 * port to the hostlist
2422 * @lport: The local port that identifies the FCoE interface to be added
2423 *
2424 * Locking: must be called with the RTNL mutex held
2425 *
2426 */
fcoe_hostlist_del(const struct fc_lport * lport)2427 static void fcoe_hostlist_del(const struct fc_lport *lport)
2428 {
2429 struct fcoe_interface *fcoe;
2430 struct fcoe_port *port;
2431
2432 port = lport_priv(lport);
2433 fcoe = port->priv;
2434 list_del(&fcoe->list);
2435 return;
2436 }
2437
2438 static struct fcoe_transport fcoe_sw_transport = {
2439 .name = {FCOE_TRANSPORT_DEFAULT},
2440 .attached = false,
2441 .list = LIST_HEAD_INIT(fcoe_sw_transport.list),
2442 .match = fcoe_match,
2443 .alloc = fcoe_ctlr_alloc,
2444 .create = fcoe_create,
2445 .destroy = fcoe_destroy,
2446 .enable = fcoe_enable,
2447 .disable = fcoe_disable,
2448 };
2449
2450 /**
2451 * fcoe_init() - Initialize fcoe.ko
2452 *
2453 * Returns: 0 on success, or a negative value on failure
2454 */
fcoe_init(void)2455 static int __init fcoe_init(void)
2456 {
2457 struct fcoe_percpu_s *p;
2458 unsigned int cpu;
2459 int rc = 0;
2460
2461 fcoe_wq = alloc_workqueue("fcoe", 0, 0);
2462 if (!fcoe_wq)
2463 return -ENOMEM;
2464
2465 /* register as a fcoe transport */
2466 rc = fcoe_transport_attach(&fcoe_sw_transport);
2467 if (rc) {
2468 printk(KERN_ERR "failed to register an fcoe transport, check "
2469 "if libfcoe is loaded\n");
2470 goto out_destroy;
2471 }
2472
2473 mutex_lock(&fcoe_config_mutex);
2474
2475 for_each_possible_cpu(cpu) {
2476 p = per_cpu_ptr(&fcoe_percpu, cpu);
2477 INIT_WORK(&p->work, fcoe_receive_work);
2478 skb_queue_head_init(&p->fcoe_rx_list);
2479 local_lock_init(&p->lock);
2480 }
2481
2482 /* Setup link change notification */
2483 fcoe_dev_setup();
2484
2485 rc = fcoe_if_init();
2486 if (rc)
2487 goto out_free;
2488
2489 mutex_unlock(&fcoe_config_mutex);
2490 return 0;
2491
2492 out_free:
2493 mutex_unlock(&fcoe_config_mutex);
2494 fcoe_transport_detach(&fcoe_sw_transport);
2495 out_destroy:
2496 destroy_workqueue(fcoe_wq);
2497 return rc;
2498 }
2499 module_init(fcoe_init);
2500
2501 /**
2502 * fcoe_exit() - Clean up fcoe.ko
2503 *
2504 * Returns: 0 on success or a negative value on failure
2505 */
fcoe_exit(void)2506 static void __exit fcoe_exit(void)
2507 {
2508 struct fcoe_interface *fcoe, *tmp;
2509 struct fcoe_ctlr *ctlr;
2510 struct fcoe_port *port;
2511 unsigned int cpu;
2512
2513 mutex_lock(&fcoe_config_mutex);
2514
2515 fcoe_dev_cleanup();
2516
2517 /* releases the associated fcoe hosts */
2518 rtnl_lock();
2519 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
2520 ctlr = fcoe_to_ctlr(fcoe);
2521 port = lport_priv(ctlr->lp);
2522 fcoe_hostlist_del(port->lport);
2523 queue_work(fcoe_wq, &port->destroy_work);
2524 }
2525 rtnl_unlock();
2526
2527 for_each_possible_cpu(cpu)
2528 fcoe_thread_cleanup_local(cpu);
2529
2530 mutex_unlock(&fcoe_config_mutex);
2531
2532 /*
2533 * destroy_work's may be chained but destroy_workqueue()
2534 * can take care of them. Just kill the fcoe_wq.
2535 */
2536 destroy_workqueue(fcoe_wq);
2537
2538 /*
2539 * Detaching from the scsi transport must happen after all
2540 * destroys are done on the fcoe_wq. destroy_workqueue will
2541 * enusre the fcoe_wq is flushed.
2542 */
2543 fcoe_if_exit();
2544
2545 /* detach from fcoe transport */
2546 fcoe_transport_detach(&fcoe_sw_transport);
2547 }
2548 module_exit(fcoe_exit);
2549
2550 /**
2551 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
2552 * @seq: active sequence in the FLOGI or FDISC exchange
2553 * @fp: response frame, or error encoded in a pointer (timeout)
2554 * @arg: pointer to the fcoe_ctlr structure
2555 *
2556 * This handles MAC address management for FCoE, then passes control on to
2557 * the libfc FLOGI response handler.
2558 */
fcoe_flogi_resp(struct fc_seq * seq,struct fc_frame * fp,void * arg)2559 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2560 {
2561 struct fcoe_ctlr *fip = arg;
2562 struct fc_exch *exch = fc_seq_exch(seq);
2563 struct fc_lport *lport = exch->lp;
2564 u8 *mac;
2565
2566 if (IS_ERR(fp))
2567 goto done;
2568
2569 mac = fr_cb(fp)->granted_mac;
2570 /* pre-FIP */
2571 if (is_zero_ether_addr(mac))
2572 fcoe_ctlr_recv_flogi(fip, lport, fp);
2573 else
2574 fcoe_update_src_mac(lport, mac);
2575 done:
2576 fc_lport_flogi_resp(seq, fp, lport);
2577 }
2578
2579 /**
2580 * fcoe_logo_resp() - FCoE specific LOGO response handler
2581 * @seq: active sequence in the LOGO exchange
2582 * @fp: response frame, or error encoded in a pointer (timeout)
2583 * @arg: pointer to the fcoe_ctlr structure
2584 *
2585 * This handles MAC address management for FCoE, then passes control on to
2586 * the libfc LOGO response handler.
2587 */
fcoe_logo_resp(struct fc_seq * seq,struct fc_frame * fp,void * arg)2588 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2589 {
2590 struct fc_lport *lport = arg;
2591 static u8 zero_mac[ETH_ALEN] = { 0 };
2592
2593 if (!IS_ERR(fp))
2594 fcoe_update_src_mac(lport, zero_mac);
2595 fc_lport_logo_resp(seq, fp, lport);
2596 }
2597
2598 /*
2599 * fcoe_elsct_send - FCoE specific ELS handler
2600 *
2601 * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
2602 * using FCoE specific response handlers and passing the FIP controller as
2603 * the argument (the lport is still available from the exchange).
2604 *
2605 * Most of the work here is just handed off to the libfc routine.
2606 */
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)2607 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
2608 struct fc_frame *fp, unsigned int op,
2609 void (*resp)(struct fc_seq *,
2610 struct fc_frame *,
2611 void *),
2612 void *arg, u32 timeout)
2613 {
2614 struct fcoe_port *port = lport_priv(lport);
2615 struct fcoe_interface *fcoe = port->priv;
2616 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
2617 struct fc_frame_header *fh = fc_frame_header_get(fp);
2618
2619 switch (op) {
2620 case ELS_FLOGI:
2621 case ELS_FDISC:
2622 if (lport->point_to_multipoint)
2623 break;
2624 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
2625 fip, timeout);
2626 case ELS_LOGO:
2627 /* only hook onto fabric logouts, not port logouts */
2628 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
2629 break;
2630 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
2631 lport, timeout);
2632 }
2633 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
2634 }
2635
2636 /**
2637 * fcoe_vport_create() - create an fc_host/scsi_host for a vport
2638 * @vport: fc_vport object to create a new fc_host for
2639 * @disabled: start the new fc_host in a disabled state by default?
2640 *
2641 * Returns: 0 for success
2642 */
fcoe_vport_create(struct fc_vport * vport,bool disabled)2643 static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
2644 {
2645 struct Scsi_Host *shost = vport_to_shost(vport);
2646 struct fc_lport *n_port = shost_priv(shost);
2647 struct fcoe_port *port = lport_priv(n_port);
2648 struct fcoe_interface *fcoe = port->priv;
2649 struct net_device *netdev = fcoe->netdev;
2650 struct fc_lport *vn_port;
2651 int rc;
2652 char buf[32];
2653
2654 rc = fcoe_validate_vport_create(vport);
2655 if (rc) {
2656 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
2657 printk(KERN_ERR "fcoe: Failed to create vport, "
2658 "WWPN (0x%s) already exists\n",
2659 buf);
2660 return rc;
2661 }
2662
2663 mutex_lock(&fcoe_config_mutex);
2664 rtnl_lock();
2665 vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
2666 rtnl_unlock();
2667 mutex_unlock(&fcoe_config_mutex);
2668
2669 if (IS_ERR(vn_port)) {
2670 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
2671 netdev->name);
2672 return -EIO;
2673 }
2674
2675 if (disabled) {
2676 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2677 } else {
2678 vn_port->boot_time = jiffies;
2679 fc_fabric_login(vn_port);
2680 fc_vport_setlink(vn_port);
2681 }
2682 return 0;
2683 }
2684
2685 /**
2686 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
2687 * @vport: fc_vport object that is being destroyed
2688 *
2689 * Returns: 0 for success
2690 */
fcoe_vport_destroy(struct fc_vport * vport)2691 static int fcoe_vport_destroy(struct fc_vport *vport)
2692 {
2693 struct Scsi_Host *shost = vport_to_shost(vport);
2694 struct fc_lport *n_port = shost_priv(shost);
2695 struct fc_lport *vn_port = vport->dd_data;
2696
2697 mutex_lock(&n_port->lp_mutex);
2698 list_del(&vn_port->list);
2699 mutex_unlock(&n_port->lp_mutex);
2700
2701 mutex_lock(&fcoe_config_mutex);
2702 rtnl_lock();
2703 fcoe_if_destroy(vn_port);
2704 rtnl_unlock();
2705 mutex_unlock(&fcoe_config_mutex);
2706
2707 return 0;
2708 }
2709
2710 /**
2711 * fcoe_vport_remove() - remove attached vports
2712 * @lport: lport for which the vports should be removed
2713 */
fcoe_vport_remove(struct fc_lport * lport)2714 static void fcoe_vport_remove(struct fc_lport *lport)
2715 {
2716 struct Scsi_Host *shost;
2717 struct fc_host_attrs *fc_host;
2718 unsigned long flags;
2719 struct fc_vport *vport;
2720 struct fc_vport *next_vport;
2721
2722 shost = lport->host;
2723 fc_host = shost_to_fc_host(shost);
2724
2725 /* Loop through all the vports and mark them for deletion */
2726 spin_lock_irqsave(shost->host_lock, flags);
2727 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2728 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
2729 continue;
2730 } else {
2731 vport->flags |= FC_VPORT_DELETING;
2732 queue_work(fc_host_work_q(shost),
2733 &vport->vport_delete_work);
2734 }
2735 }
2736 spin_unlock_irqrestore(shost->host_lock, flags);
2737
2738 flush_workqueue(fc_host_work_q(shost));
2739 }
2740
2741 /**
2742 * fcoe_vport_disable() - change vport state
2743 * @vport: vport to bring online/offline
2744 * @disable: should the vport be disabled?
2745 */
fcoe_vport_disable(struct fc_vport * vport,bool disable)2746 static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
2747 {
2748 struct fc_lport *lport = vport->dd_data;
2749
2750 if (disable) {
2751 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2752 fc_fabric_logoff(lport);
2753 } else {
2754 lport->boot_time = jiffies;
2755 fc_fabric_login(lport);
2756 fc_vport_setlink(lport);
2757 }
2758
2759 return 0;
2760 }
2761
2762 /**
2763 * fcoe_set_vport_symbolic_name() - append vport string to symbolic name
2764 * @vport: fc_vport with a new symbolic name string
2765 *
2766 * After generating a new symbolic name string, a new RSPN_ID request is
2767 * sent to the name server. There is no response handler, so if it fails
2768 * for some reason it will not be retried.
2769 */
fcoe_set_vport_symbolic_name(struct fc_vport * vport)2770 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
2771 {
2772 struct fc_lport *lport = vport->dd_data;
2773 struct fc_frame *fp;
2774 size_t len;
2775
2776 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
2777 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
2778 fcoe_netdev(lport)->name, vport->symbolic_name);
2779
2780 if (lport->state != LPORT_ST_READY)
2781 return;
2782
2783 len = strnlen(fc_host_symbolic_name(lport->host), 255);
2784 fp = fc_frame_alloc(lport,
2785 sizeof(struct fc_ct_hdr) +
2786 sizeof(struct fc_ns_rspn) + len);
2787 if (!fp)
2788 return;
2789 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
2790 NULL, NULL, 3 * lport->r_a_tov);
2791 }
2792
fcoe_fcf_get_vlan_id(struct fcoe_fcf_device * fcf_dev)2793 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev)
2794 {
2795 struct fcoe_ctlr_device *ctlr_dev =
2796 fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2797 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2798 struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2799
2800 fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev);
2801 }
2802
2803 /**
2804 * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
2805 * @lport: the local port
2806 * @port_id: the port ID
2807 * @fp: the received frame, if any, that caused the port_id to be set.
2808 *
2809 * This routine handles the case where we received a FLOGI and are
2810 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi()
2811 * so it can set the non-mapped mode and gateway address.
2812 *
2813 * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
2814 */
fcoe_set_port_id(struct fc_lport * lport,u32 port_id,struct fc_frame * fp)2815 static void fcoe_set_port_id(struct fc_lport *lport,
2816 u32 port_id, struct fc_frame *fp)
2817 {
2818 struct fcoe_port *port = lport_priv(lport);
2819 struct fcoe_interface *fcoe = port->priv;
2820 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2821
2822 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
2823 fcoe_ctlr_recv_flogi(ctlr, lport, fp);
2824 }
2825
