random32: rename random32 to prandom
[sfrench/cifs-2.6.git] / drivers / scsi / fcoe / fcoe_ctlr.c
1 /*
2  * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
3  * Copyright (c) 2009 Intel Corporation.  All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms and conditions of the GNU General Public License,
7  * version 2, as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17  *
18  * Maintained at www.Open-FCoE.org
19  */
20
21 #include <linux/types.h>
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/list.h>
25 #include <linux/spinlock.h>
26 #include <linux/timer.h>
27 #include <linux/netdevice.h>
28 #include <linux/etherdevice.h>
29 #include <linux/ethtool.h>
30 #include <linux/if_ether.h>
31 #include <linux/if_vlan.h>
32 #include <linux/errno.h>
33 #include <linux/bitops.h>
34 #include <linux/slab.h>
35 #include <net/rtnetlink.h>
36
37 #include <scsi/fc/fc_els.h>
38 #include <scsi/fc/fc_fs.h>
39 #include <scsi/fc/fc_fip.h>
40 #include <scsi/fc/fc_encaps.h>
41 #include <scsi/fc/fc_fcoe.h>
42 #include <scsi/fc/fc_fcp.h>
43
44 #include <scsi/libfc.h>
45 #include <scsi/libfcoe.h>
46
47 #include "libfcoe.h"
48
49 #define FCOE_CTLR_MIN_FKA       500             /* min keep alive (mS) */
50 #define FCOE_CTLR_DEF_FKA       FIP_DEF_FKA     /* default keep alive (mS) */
51
52 static void fcoe_ctlr_timeout(unsigned long);
53 static void fcoe_ctlr_timer_work(struct work_struct *);
54 static void fcoe_ctlr_recv_work(struct work_struct *);
55 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *);
56
57 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *);
58 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *, struct sk_buff *);
59 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *);
60 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *, u32, u8 *);
61
62 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
63 static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS;
64 static u8 fcoe_all_vn2vn[ETH_ALEN] = FIP_ALL_VN2VN_MACS;
65 static u8 fcoe_all_p2p[ETH_ALEN] = FIP_ALL_P2P_MACS;
66
67 static const char * const fcoe_ctlr_states[] = {
68         [FIP_ST_DISABLED] =     "DISABLED",
69         [FIP_ST_LINK_WAIT] =    "LINK_WAIT",
70         [FIP_ST_AUTO] =         "AUTO",
71         [FIP_ST_NON_FIP] =      "NON_FIP",
72         [FIP_ST_ENABLED] =      "ENABLED",
73         [FIP_ST_VNMP_START] =   "VNMP_START",
74         [FIP_ST_VNMP_PROBE1] =  "VNMP_PROBE1",
75         [FIP_ST_VNMP_PROBE2] =  "VNMP_PROBE2",
76         [FIP_ST_VNMP_CLAIM] =   "VNMP_CLAIM",
77         [FIP_ST_VNMP_UP] =      "VNMP_UP",
78 };
79
80 static const char *fcoe_ctlr_state(enum fip_state state)
81 {
82         const char *cp = "unknown";
83
84         if (state < ARRAY_SIZE(fcoe_ctlr_states))
85                 cp = fcoe_ctlr_states[state];
86         if (!cp)
87                 cp = "unknown";
88         return cp;
89 }
90
91 /**
92  * fcoe_ctlr_set_state() - Set and do debug printing for the new FIP state.
93  * @fip: The FCoE controller
94  * @state: The new state
95  */
96 static void fcoe_ctlr_set_state(struct fcoe_ctlr *fip, enum fip_state state)
97 {
98         if (state == fip->state)
99                 return;
100         if (fip->lp)
101                 LIBFCOE_FIP_DBG(fip, "state %s -> %s\n",
102                         fcoe_ctlr_state(fip->state), fcoe_ctlr_state(state));
103         fip->state = state;
104 }
105
106 /**
107  * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
108  * @fcf: The FCF to check
109  *
110  * Return non-zero if FCF fcoe_size has been validated.
111  */
112 static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
113 {
114         return (fcf->flags & FIP_FL_SOL) != 0;
115 }
116
117 /**
118  * fcoe_ctlr_fcf_usable() - Check if a FCF is usable
119  * @fcf: The FCF to check
120  *
121  * Return non-zero if the FCF is usable.
122  */
123 static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
124 {
125         u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
126
127         return (fcf->flags & flags) == flags;
128 }
129
130 /**
131  * fcoe_ctlr_map_dest() - Set flag and OUI for mapping destination addresses
132  * @fip: The FCoE controller
133  */
134 static void fcoe_ctlr_map_dest(struct fcoe_ctlr *fip)
135 {
136         if (fip->mode == FIP_MODE_VN2VN)
137                 hton24(fip->dest_addr, FIP_VN_FC_MAP);
138         else
139                 hton24(fip->dest_addr, FIP_DEF_FC_MAP);
140         hton24(fip->dest_addr + 3, 0);
141         fip->map_dest = 1;
142 }
143
144 /**
145  * fcoe_ctlr_init() - Initialize the FCoE Controller instance
146  * @fip: The FCoE controller to initialize
147  */
148 void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_state mode)
149 {
150         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
151         fip->mode = mode;
152         INIT_LIST_HEAD(&fip->fcfs);
153         mutex_init(&fip->ctlr_mutex);
154         spin_lock_init(&fip->ctlr_lock);
155         fip->flogi_oxid = FC_XID_UNKNOWN;
156         setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
157         INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
158         INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
159         skb_queue_head_init(&fip->fip_recv_list);
160 }
161 EXPORT_SYMBOL(fcoe_ctlr_init);
162
163 static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
164 {
165         struct fcoe_ctlr *fip = new->fip;
166         struct fcoe_ctlr_device *ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
167         struct fcoe_fcf_device temp, *fcf_dev;
168         int rc = 0;
169
170         LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
171                         new->fabric_name, new->fcf_mac);
172
173         mutex_lock(&ctlr_dev->lock);
174
175         temp.fabric_name = new->fabric_name;
176         temp.switch_name = new->switch_name;
177         temp.fc_map = new->fc_map;
178         temp.vfid = new->vfid;
179         memcpy(temp.mac, new->fcf_mac, ETH_ALEN);
180         temp.priority = new->pri;
181         temp.fka_period = new->fka_period;
182         temp.selected = 0; /* default to unselected */
183
184         fcf_dev = fcoe_fcf_device_add(ctlr_dev, &temp);
185         if (unlikely(!fcf_dev)) {
186                 rc = -ENOMEM;
187                 goto out;
188         }
189
190         /*
191          * The fcoe_sysfs layer can return a CONNECTED fcf that
192          * has a priv (fcf was never deleted) or a CONNECTED fcf
193          * that doesn't have a priv (fcf was deleted). However,
194          * libfcoe will always delete FCFs before trying to add
195          * them. This is ensured because both recv_adv and
196          * age_fcfs are protected by the the fcoe_ctlr's mutex.
197          * This means that we should never get a FCF with a
198          * non-NULL priv pointer.
199          */
200         BUG_ON(fcf_dev->priv);
201
202         fcf_dev->priv = new;
203         new->fcf_dev = fcf_dev;
204
205         list_add(&new->list, &fip->fcfs);
206         fip->fcf_count++;
207
208 out:
209         mutex_unlock(&ctlr_dev->lock);
210         return rc;
211 }
212
213 static void fcoe_sysfs_fcf_del(struct fcoe_fcf *new)
214 {
215         struct fcoe_ctlr *fip = new->fip;
216         struct fcoe_ctlr_device *ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
217         struct fcoe_fcf_device *fcf_dev;
218
219         list_del(&new->list);
220         fip->fcf_count--;
221
222         mutex_lock(&ctlr_dev->lock);
223
224         fcf_dev = fcoe_fcf_to_fcf_dev(new);
225         WARN_ON(!fcf_dev);
226         new->fcf_dev = NULL;
227         fcoe_fcf_device_delete(fcf_dev);
228         kfree(new);
229
230         mutex_unlock(&ctlr_dev->lock);
231 }
232
233 /**
234  * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
235  * @fip: The FCoE controller whose FCFs are to be reset
236  *
237  * Called with &fcoe_ctlr lock held.
238  */
239 static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
240 {
241         struct fcoe_fcf *fcf;
242         struct fcoe_fcf *next;
243
244         fip->sel_fcf = NULL;
245         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
246                 fcoe_sysfs_fcf_del(fcf);
247         }
248         WARN_ON(fip->fcf_count);
249
250         fip->sel_time = 0;
251 }
252
253 /**
254  * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
255  * @fip: The FCoE controller to tear down
256  *
257  * This is called by FCoE drivers before freeing the &fcoe_ctlr.
258  *
259  * The receive handler will have been deleted before this to guarantee
260  * that no more recv_work will be scheduled.
261  *
262  * The timer routine will simply return once we set FIP_ST_DISABLED.
263  * This guarantees that no further timeouts or work will be scheduled.
264  */
265 void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
266 {
267         cancel_work_sync(&fip->recv_work);
268         skb_queue_purge(&fip->fip_recv_list);
269
270         mutex_lock(&fip->ctlr_mutex);
271         fcoe_ctlr_set_state(fip, FIP_ST_DISABLED);
272         fcoe_ctlr_reset_fcfs(fip);
273         mutex_unlock(&fip->ctlr_mutex);
274         del_timer_sync(&fip->timer);
275         cancel_work_sync(&fip->timer_work);
276 }
277 EXPORT_SYMBOL(fcoe_ctlr_destroy);
278
279 /**
280  * fcoe_ctlr_announce() - announce new FCF selection
281  * @fip: The FCoE controller
282  *
283  * Also sets the destination MAC for FCoE and control packets
284  *
285  * Called with neither ctlr_mutex nor ctlr_lock held.
286  */
287 static void fcoe_ctlr_announce(struct fcoe_ctlr *fip)
288 {
289         struct fcoe_fcf *sel;
290         struct fcoe_fcf *fcf;
291
292         mutex_lock(&fip->ctlr_mutex);
293         spin_lock_bh(&fip->ctlr_lock);
294
295         kfree_skb(fip->flogi_req);
296         fip->flogi_req = NULL;
297         list_for_each_entry(fcf, &fip->fcfs, list)
298                 fcf->flogi_sent = 0;
299
300         spin_unlock_bh(&fip->ctlr_lock);
301         sel = fip->sel_fcf;
302
303         if (sel && !compare_ether_addr(sel->fcf_mac, fip->dest_addr))
304                 goto unlock;
305         if (!is_zero_ether_addr(fip->dest_addr)) {
306                 printk(KERN_NOTICE "libfcoe: host%d: "
307                        "FIP Fibre-Channel Forwarder MAC %pM deselected\n",
308                        fip->lp->host->host_no, fip->dest_addr);
309                 memset(fip->dest_addr, 0, ETH_ALEN);
310         }
311         if (sel) {
312                 printk(KERN_INFO "libfcoe: host%d: FIP selected "
313                        "Fibre-Channel Forwarder MAC %pM\n",
314                        fip->lp->host->host_no, sel->fcf_mac);
315                 memcpy(fip->dest_addr, sel->fcoe_mac, ETH_ALEN);
316                 fip->map_dest = 0;
317         }
318 unlock:
319         mutex_unlock(&fip->ctlr_mutex);
320 }
321
322 /**
323  * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
324  * @fip: The FCoE controller to get the maximum FCoE size from
325  *
326  * Returns the maximum packet size including the FCoE header and trailer,
327  * but not including any Ethernet or VLAN headers.
328  */
329 static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
330 {
331         /*
332          * Determine the max FCoE frame size allowed, including
333          * FCoE header and trailer.
334          * Note:  lp->mfs is currently the payload size, not the frame size.
335          */
336         return fip->lp->mfs + sizeof(struct fc_frame_header) +
337                 sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
338 }
339
340 /**
341  * fcoe_ctlr_solicit() - Send a FIP solicitation
342  * @fip: The FCoE controller to send the solicitation on
343  * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
344  */
345 static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
346 {
347         struct sk_buff *skb;
348         struct fip_sol {
349                 struct ethhdr eth;
350                 struct fip_header fip;
351                 struct {
352                         struct fip_mac_desc mac;
353                         struct fip_wwn_desc wwnn;
354                         struct fip_size_desc size;
355                 } __packed desc;
356         }  __packed * sol;
357         u32 fcoe_size;
358
359         skb = dev_alloc_skb(sizeof(*sol));
360         if (!skb)
361                 return;
362
363         sol = (struct fip_sol *)skb->data;
364
365         memset(sol, 0, sizeof(*sol));
366         memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
367         memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
368         sol->eth.h_proto = htons(ETH_P_FIP);
369
370         sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
371         sol->fip.fip_op = htons(FIP_OP_DISC);
372         sol->fip.fip_subcode = FIP_SC_SOL;
373         sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
374         sol->fip.fip_flags = htons(FIP_FL_FPMA);
375         if (fip->spma)
376                 sol->fip.fip_flags |= htons(FIP_FL_SPMA);
377
378         sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
379         sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
380         memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
381
382         sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
383         sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
384         put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
385
386         fcoe_size = fcoe_ctlr_fcoe_size(fip);
387         sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
388         sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
389         sol->desc.size.fd_size = htons(fcoe_size);
390
391         skb_put(skb, sizeof(*sol));
392         skb->protocol = htons(ETH_P_FIP);
393         skb->priority = fip->priority;
394         skb_reset_mac_header(skb);
395         skb_reset_network_header(skb);
396         fip->send(fip, skb);
397
398         if (!fcf)
399                 fip->sol_time = jiffies;
400 }
401
402 /**
403  * fcoe_ctlr_link_up() - Start FCoE controller
404  * @fip: The FCoE controller to start
405  *
406  * Called from the LLD when the network link is ready.
407  */
408 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
409 {
410         mutex_lock(&fip->ctlr_mutex);
411         if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
412                 mutex_unlock(&fip->ctlr_mutex);
413                 fc_linkup(fip->lp);
414         } else if (fip->state == FIP_ST_LINK_WAIT) {
415                 fcoe_ctlr_set_state(fip, fip->mode);
416                 switch (fip->mode) {
417                 default:
418                         LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode);
419                         /* fall-through */
420                 case FIP_MODE_AUTO:
421                         LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
422                         /* fall-through */
423                 case FIP_MODE_FABRIC:
424                 case FIP_MODE_NON_FIP:
425                         mutex_unlock(&fip->ctlr_mutex);
426                         fc_linkup(fip->lp);
427                         fcoe_ctlr_solicit(fip, NULL);
428                         break;
429                 case FIP_MODE_VN2VN:
430                         fcoe_ctlr_vn_start(fip);
431                         mutex_unlock(&fip->ctlr_mutex);
432                         fc_linkup(fip->lp);
433                         break;
434                 }
435         } else
436                 mutex_unlock(&fip->ctlr_mutex);
437 }
438 EXPORT_SYMBOL(fcoe_ctlr_link_up);
439
440 /**
441  * fcoe_ctlr_reset() - Reset a FCoE controller
442  * @fip:       The FCoE controller to reset
443  */
444 static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
445 {
446         fcoe_ctlr_reset_fcfs(fip);
447         del_timer(&fip->timer);
448         fip->ctlr_ka_time = 0;
449         fip->port_ka_time = 0;
450         fip->sol_time = 0;
451         fip->flogi_oxid = FC_XID_UNKNOWN;
452         fcoe_ctlr_map_dest(fip);
453 }
454
455 /**
456  * fcoe_ctlr_link_down() - Stop a FCoE controller
457  * @fip: The FCoE controller to be stopped
458  *
459  * Returns non-zero if the link was up and now isn't.
460  *
461  * Called from the LLD when the network link is not ready.
462  * There may be multiple calls while the link is down.
463  */
464 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
465 {
466         int link_dropped;
467
468         LIBFCOE_FIP_DBG(fip, "link down.\n");
469         mutex_lock(&fip->ctlr_mutex);
470         fcoe_ctlr_reset(fip);
471         link_dropped = fip->state != FIP_ST_LINK_WAIT;
472         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
473         mutex_unlock(&fip->ctlr_mutex);
474
475         if (link_dropped)
476                 fc_linkdown(fip->lp);
477         return link_dropped;
478 }
479 EXPORT_SYMBOL(fcoe_ctlr_link_down);
480
481 /**
482  * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
483  * @fip:   The FCoE controller to send the FKA on
484  * @lport: libfc fc_lport to send from
485  * @ports: 0 for controller keep-alive, 1 for port keep-alive
486  * @sa:    The source MAC address
487  *
488  * A controller keep-alive is sent every fka_period (typically 8 seconds).
489  * The source MAC is the native MAC address.
490  *
491  * A port keep-alive is sent every 90 seconds while logged in.
492  * The source MAC is the assigned mapped source address.
493  * The destination is the FCF's F-port.
494  */
495 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
496                                       struct fc_lport *lport,
497                                       int ports, u8 *sa)
498 {
499         struct sk_buff *skb;
500         struct fip_kal {
501                 struct ethhdr eth;
502                 struct fip_header fip;
503                 struct fip_mac_desc mac;
504         } __packed * kal;
505         struct fip_vn_desc *vn;
506         u32 len;
507         struct fc_lport *lp;
508         struct fcoe_fcf *fcf;
509
510         fcf = fip->sel_fcf;
511         lp = fip->lp;
512         if (!fcf || (ports && !lp->port_id))
513                 return;
514
515         len = sizeof(*kal) + ports * sizeof(*vn);
516         skb = dev_alloc_skb(len);
517         if (!skb)
518                 return;
519
520         kal = (struct fip_kal *)skb->data;
521         memset(kal, 0, len);
522         memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
523         memcpy(kal->eth.h_source, sa, ETH_ALEN);
524         kal->eth.h_proto = htons(ETH_P_FIP);
525
526         kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
527         kal->fip.fip_op = htons(FIP_OP_CTRL);
528         kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
529         kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
530                                      ports * sizeof(*vn)) / FIP_BPW);
531         kal->fip.fip_flags = htons(FIP_FL_FPMA);
532         if (fip->spma)
533                 kal->fip.fip_flags |= htons(FIP_FL_SPMA);
534
535         kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
536         kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
537         memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
538         if (ports) {
539                 vn = (struct fip_vn_desc *)(kal + 1);
540                 vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
541                 vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
542                 memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
543                 hton24(vn->fd_fc_id, lport->port_id);
544                 put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
545         }
546         skb_put(skb, len);
547         skb->protocol = htons(ETH_P_FIP);
548         skb->priority = fip->priority;
549         skb_reset_mac_header(skb);
550         skb_reset_network_header(skb);
551         fip->send(fip, skb);
552 }
553
554 /**
555  * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
556  * @fip:   The FCoE controller for the ELS frame
557  * @dtype: The FIP descriptor type for the frame
558  * @skb:   The FCoE ELS frame including FC header but no FCoE headers
559  * @d_id:  The destination port ID.
560  *
561  * Returns non-zero error code on failure.
562  *
563  * The caller must check that the length is a multiple of 4.
564  *
565  * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
566  * Headroom includes the FIP encapsulation description, FIP header, and
567  * Ethernet header.  The tailroom is for the FIP MAC descriptor.
568  */
569 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
570                             u8 dtype, struct sk_buff *skb, u32 d_id)
571 {
572         struct fip_encaps_head {
573                 struct ethhdr eth;
574                 struct fip_header fip;
575                 struct fip_encaps encaps;
576         } __packed * cap;
577         struct fc_frame_header *fh;
578         struct fip_mac_desc *mac;
579         struct fcoe_fcf *fcf;
580         size_t dlen;
581         u16 fip_flags;
582         u8 op;
583
584         fh = (struct fc_frame_header *)skb->data;
585         op = *(u8 *)(fh + 1);
586         dlen = sizeof(struct fip_encaps) + skb->len;    /* len before push */
587         cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));
588         memset(cap, 0, sizeof(*cap));
589
590         if (lport->point_to_multipoint) {
591                 if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest))
592                         return -ENODEV;
593                 fip_flags = 0;
594         } else {
595                 fcf = fip->sel_fcf;
596                 if (!fcf)
597                         return -ENODEV;
598                 fip_flags = fcf->flags;
599                 fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA :
600                                          FIP_FL_FPMA;
601                 if (!fip_flags)
602                         return -ENODEV;
603                 memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
604         }
605         memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
606         cap->eth.h_proto = htons(ETH_P_FIP);
607
608         cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
609         cap->fip.fip_op = htons(FIP_OP_LS);
610         if (op == ELS_LS_ACC || op == ELS_LS_RJT)
611                 cap->fip.fip_subcode = FIP_SC_REP;
612         else
613                 cap->fip.fip_subcode = FIP_SC_REQ;
614         cap->fip.fip_flags = htons(fip_flags);
615
616         cap->encaps.fd_desc.fip_dtype = dtype;
617         cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
618
619         if (op != ELS_LS_RJT) {
620                 dlen += sizeof(*mac);
621                 mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
622                 memset(mac, 0, sizeof(*mac));
623                 mac->fd_desc.fip_dtype = FIP_DT_MAC;
624                 mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
625                 if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
626                         memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
627                 } else if (fip->mode == FIP_MODE_VN2VN) {
628                         hton24(mac->fd_mac, FIP_VN_FC_MAP);
629                         hton24(mac->fd_mac + 3, fip->port_id);
630                 } else if (fip_flags & FIP_FL_SPMA) {
631                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
632                         memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
633                 } else {
634                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
635                         /* FPMA only FLOGI.  Must leave the MAC desc zeroed. */
636                 }
637         }
638         cap->fip.fip_dl_len = htons(dlen / FIP_BPW);
639
640         skb->protocol = htons(ETH_P_FIP);
641         skb->priority = fip->priority;
642         skb_reset_mac_header(skb);
643         skb_reset_network_header(skb);
644         return 0;
645 }
646
647 /**
648  * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
649  * @fip:        FCoE controller.
650  * @lport:      libfc fc_lport to send from
651  * @skb:        FCoE ELS frame including FC header but no FCoE headers.
652  *
653  * Returns a non-zero error code if the frame should not be sent.
654  * Returns zero if the caller should send the frame with FCoE encapsulation.
655  *
656  * The caller must check that the length is a multiple of 4.
657  * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
658  * The the skb must also be an fc_frame.
659  *
660  * This is called from the lower-level driver with spinlocks held,
661  * so we must not take a mutex here.
662  */
663 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
664                        struct sk_buff *skb)
665 {
666         struct fc_frame *fp;
667         struct fc_frame_header *fh;
668         u16 old_xid;
669         u8 op;
670         u8 mac[ETH_ALEN];
671
672         fp = container_of(skb, struct fc_frame, skb);
673         fh = (struct fc_frame_header *)skb->data;
674         op = *(u8 *)(fh + 1);
675
676         if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) {
677                 old_xid = fip->flogi_oxid;
678                 fip->flogi_oxid = ntohs(fh->fh_ox_id);
679                 if (fip->state == FIP_ST_AUTO) {
680                         if (old_xid == FC_XID_UNKNOWN)
681                                 fip->flogi_count = 0;
682                         fip->flogi_count++;
683                         if (fip->flogi_count < 3)
684                                 goto drop;
685                         fcoe_ctlr_map_dest(fip);
686                         return 0;
687                 }
688                 if (fip->state == FIP_ST_NON_FIP)
689                         fcoe_ctlr_map_dest(fip);
690         }
691
692         if (fip->state == FIP_ST_NON_FIP)
693                 return 0;
694         if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN)
695                 goto drop;
696         switch (op) {
697         case ELS_FLOGI:
698                 op = FIP_DT_FLOGI;
699                 if (fip->mode == FIP_MODE_VN2VN)
700                         break;
701                 spin_lock_bh(&fip->ctlr_lock);
702                 kfree_skb(fip->flogi_req);
703                 fip->flogi_req = skb;
704                 fip->flogi_req_send = 1;
705                 spin_unlock_bh(&fip->ctlr_lock);
706                 schedule_work(&fip->timer_work);
707                 return -EINPROGRESS;
708         case ELS_FDISC:
709                 if (ntoh24(fh->fh_s_id))
710                         return 0;
711                 op = FIP_DT_FDISC;
712                 break;
713         case ELS_LOGO:
714                 if (fip->mode == FIP_MODE_VN2VN) {
715                         if (fip->state != FIP_ST_VNMP_UP)
716                                 return -EINVAL;
717                         if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI)
718                                 return -EINVAL;
719                 } else {
720                         if (fip->state != FIP_ST_ENABLED)
721                                 return 0;
722                         if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
723                                 return 0;
724                 }
725                 op = FIP_DT_LOGO;
726                 break;
727         case ELS_LS_ACC:
728                 /*
729                  * If non-FIP, we may have gotten an SID by accepting an FLOGI
730                  * from a point-to-point connection.  Switch to using
731                  * the source mac based on the SID.  The destination
732                  * MAC in this case would have been set by receiving the
733                  * FLOGI.
734                  */
735                 if (fip->state == FIP_ST_NON_FIP) {
736                         if (fip->flogi_oxid == FC_XID_UNKNOWN)
737                                 return 0;
738                         fip->flogi_oxid = FC_XID_UNKNOWN;
739                         fc_fcoe_set_mac(mac, fh->fh_d_id);
740                         fip->update_mac(lport, mac);
741                 }
742                 /* fall through */
743         case ELS_LS_RJT:
744                 op = fr_encaps(fp);
745                 if (op)
746                         break;
747                 return 0;
748         default:
749                 if (fip->state != FIP_ST_ENABLED &&
750                     fip->state != FIP_ST_VNMP_UP)
751                         goto drop;
752                 return 0;
753         }
754         LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n",
755                         op, ntoh24(fh->fh_d_id));
756         if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id)))
757                 goto drop;
758         fip->send(fip, skb);
759         return -EINPROGRESS;
760 drop:
761         kfree_skb(skb);
762         return -EINVAL;
763 }
764 EXPORT_SYMBOL(fcoe_ctlr_els_send);
765
766 /**
767  * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
768  * @fip: The FCoE controller to free FCFs on
769  *
770  * Called with lock held and preemption disabled.
771  *
772  * An FCF is considered old if we have missed two advertisements.
773  * That is, there have been no valid advertisement from it for 2.5
774  * times its keep-alive period.
775  *
776  * In addition, determine the time when an FCF selection can occur.
777  *
778  * Also, increment the MissDiscAdvCount when no advertisement is received
779  * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
780  *
781  * Returns the time in jiffies for the next call.
782  */
783 static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
784 {
785         struct fcoe_fcf *fcf;
786         struct fcoe_fcf *next;
787         unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
788         unsigned long deadline;
789         unsigned long sel_time = 0;
790         struct list_head del_list;
791         struct fc_stats *stats;
792
793         INIT_LIST_HEAD(&del_list);
794
795         stats = per_cpu_ptr(fip->lp->stats, get_cpu());
796
797         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
798                 deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
799                 if (fip->sel_fcf == fcf) {
800                         if (time_after(jiffies, deadline)) {
801                                 stats->MissDiscAdvCount++;
802                                 printk(KERN_INFO "libfcoe: host%d: "
803                                        "Missing Discovery Advertisement "
804                                        "for fab %16.16llx count %lld\n",
805                                        fip->lp->host->host_no, fcf->fabric_name,
806                                        stats->MissDiscAdvCount);
807                         } else if (time_after(next_timer, deadline))
808                                 next_timer = deadline;
809                 }
810
811                 deadline += fcf->fka_period;
812                 if (time_after_eq(jiffies, deadline)) {
813                         if (fip->sel_fcf == fcf)
814                                 fip->sel_fcf = NULL;
815                         /*
816                          * Move to delete list so we can call
817                          * fcoe_sysfs_fcf_del (which can sleep)
818                          * after the put_cpu().
819                          */
820                         list_del(&fcf->list);
821                         list_add(&fcf->list, &del_list);
822                         stats->VLinkFailureCount++;
823                 } else {
824                         if (time_after(next_timer, deadline))
825                                 next_timer = deadline;
826                         if (fcoe_ctlr_mtu_valid(fcf) &&
827                             (!sel_time || time_before(sel_time, fcf->time)))
828                                 sel_time = fcf->time;
829                 }
830         }
831         put_cpu();
832
833         list_for_each_entry_safe(fcf, next, &del_list, list) {
834                 /* Removes fcf from current list */
835                 fcoe_sysfs_fcf_del(fcf);
836         }
837
838         if (sel_time && !fip->sel_fcf && !fip->sel_time) {
839                 sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
840                 fip->sel_time = sel_time;
841         }
842
843         return next_timer;
844 }
845
846 /**
847  * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
848  * @fip: The FCoE controller receiving the advertisement
849  * @skb: The received FIP advertisement frame
850  * @fcf: The resulting FCF entry
851  *
852  * Returns zero on a valid parsed advertisement,
853  * otherwise returns non zero value.
854  */
855 static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
856                                struct sk_buff *skb, struct fcoe_fcf *fcf)
857 {
858         struct fip_header *fiph;
859         struct fip_desc *desc = NULL;
860         struct fip_wwn_desc *wwn;
861         struct fip_fab_desc *fab;
862         struct fip_fka_desc *fka;
863         unsigned long t;
864         size_t rlen;
865         size_t dlen;
866         u32 desc_mask;
867
868         memset(fcf, 0, sizeof(*fcf));
869         fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
870
871         fiph = (struct fip_header *)skb->data;
872         fcf->flags = ntohs(fiph->fip_flags);
873
874         /*
875          * mask of required descriptors. validating each one clears its bit.
876          */
877         desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
878                         BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA);
879
880         rlen = ntohs(fiph->fip_dl_len) * 4;
881         if (rlen + sizeof(*fiph) > skb->len)
882                 return -EINVAL;
883
884         desc = (struct fip_desc *)(fiph + 1);
885         while (rlen > 0) {
886                 dlen = desc->fip_dlen * FIP_BPW;
887                 if (dlen < sizeof(*desc) || dlen > rlen)
888                         return -EINVAL;
889                 /* Drop Adv if there are duplicate critical descriptors */
890                 if ((desc->fip_dtype < 32) &&
891                     !(desc_mask & 1U << desc->fip_dtype)) {
892                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
893                                         "Descriptors in FIP adv\n");
894                         return -EINVAL;
895                 }
896                 switch (desc->fip_dtype) {
897                 case FIP_DT_PRI:
898                         if (dlen != sizeof(struct fip_pri_desc))
899                                 goto len_err;
900                         fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
901                         desc_mask &= ~BIT(FIP_DT_PRI);
902                         break;
903                 case FIP_DT_MAC:
904                         if (dlen != sizeof(struct fip_mac_desc))
905                                 goto len_err;
906                         memcpy(fcf->fcf_mac,
907                                ((struct fip_mac_desc *)desc)->fd_mac,
908                                ETH_ALEN);
909                         memcpy(fcf->fcoe_mac, fcf->fcf_mac, ETH_ALEN);
910                         if (!is_valid_ether_addr(fcf->fcf_mac)) {
911                                 LIBFCOE_FIP_DBG(fip,
912                                         "Invalid MAC addr %pM in FIP adv\n",
913                                         fcf->fcf_mac);
914                                 return -EINVAL;
915                         }
916                         desc_mask &= ~BIT(FIP_DT_MAC);
917                         break;
918                 case FIP_DT_NAME:
919                         if (dlen != sizeof(struct fip_wwn_desc))
920                                 goto len_err;
921                         wwn = (struct fip_wwn_desc *)desc;
922                         fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
923                         desc_mask &= ~BIT(FIP_DT_NAME);
924                         break;
925                 case FIP_DT_FAB:
926                         if (dlen != sizeof(struct fip_fab_desc))
927                                 goto len_err;
928                         fab = (struct fip_fab_desc *)desc;
929                         fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
930                         fcf->vfid = ntohs(fab->fd_vfid);
931                         fcf->fc_map = ntoh24(fab->fd_map);
932                         desc_mask &= ~BIT(FIP_DT_FAB);
933                         break;
934                 case FIP_DT_FKA:
935                         if (dlen != sizeof(struct fip_fka_desc))
936                                 goto len_err;
937                         fka = (struct fip_fka_desc *)desc;
938                         if (fka->fd_flags & FIP_FKA_ADV_D)
939                                 fcf->fd_flags = 1;
940                         t = ntohl(fka->fd_fka_period);
941                         if (t >= FCOE_CTLR_MIN_FKA)
942                                 fcf->fka_period = msecs_to_jiffies(t);
943                         desc_mask &= ~BIT(FIP_DT_FKA);
944                         break;
945                 case FIP_DT_MAP_OUI:
946                 case FIP_DT_FCOE_SIZE:
947                 case FIP_DT_FLOGI:
948                 case FIP_DT_FDISC:
949                 case FIP_DT_LOGO:
950                 case FIP_DT_ELP:
951                 default:
952                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
953                                         "in FIP adv\n", desc->fip_dtype);
954                         /* standard says ignore unknown descriptors >= 128 */
955                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
956                                 return -EINVAL;
957                         break;
958                 }
959                 desc = (struct fip_desc *)((char *)desc + dlen);
960                 rlen -= dlen;
961         }
962         if (!fcf->fc_map || (fcf->fc_map & 0x10000))
963                 return -EINVAL;
964         if (!fcf->switch_name)
965                 return -EINVAL;
966         if (desc_mask) {
967                 LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n",
968                                 desc_mask);
969                 return -EINVAL;
970         }
971         return 0;
972
973 len_err:
974         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
975                         desc->fip_dtype, dlen);
976         return -EINVAL;
977 }
978
979 /**
980  * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
981  * @fip: The FCoE controller receiving the advertisement
982  * @skb: The received FIP packet
983  */
984 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
985 {
986         struct fcoe_fcf *fcf;
987         struct fcoe_fcf new;
988         unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
989         int first = 0;
990         int mtu_valid;
991         int found = 0;
992         int rc = 0;
993
994         if (fcoe_ctlr_parse_adv(fip, skb, &new))
995                 return;
996
997         mutex_lock(&fip->ctlr_mutex);
998         first = list_empty(&fip->fcfs);
999         list_for_each_entry(fcf, &fip->fcfs, list) {
1000                 if (fcf->switch_name == new.switch_name &&
1001                     fcf->fabric_name == new.fabric_name &&
1002                     fcf->fc_map == new.fc_map &&
1003                     compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) {
1004                         found = 1;
1005                         break;
1006                 }
1007         }
1008         if (!found) {
1009                 if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
1010                         goto out;
1011
1012                 fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
1013                 if (!fcf)
1014                         goto out;
1015
1016                 memcpy(fcf, &new, sizeof(new));
1017                 fcf->fip = fip;
1018                 rc = fcoe_sysfs_fcf_add(fcf);
1019                 if (rc) {
1020                         printk(KERN_ERR "Failed to allocate sysfs instance "
1021                                "for FCF, fab %16.16llx mac %pM\n",
1022                                new.fabric_name, new.fcf_mac);
1023                         kfree(fcf);
1024                         goto out;
1025                 }
1026         } else {
1027                 /*
1028                  * Update the FCF's keep-alive descriptor flags.
1029                  * Other flag changes from new advertisements are
1030                  * ignored after a solicited advertisement is
1031                  * received and the FCF is selectable (usable).
1032                  */
1033                 fcf->fd_flags = new.fd_flags;
1034                 if (!fcoe_ctlr_fcf_usable(fcf))
1035                         fcf->flags = new.flags;
1036
1037                 if (fcf == fip->sel_fcf && !fcf->fd_flags) {
1038                         fip->ctlr_ka_time -= fcf->fka_period;
1039                         fip->ctlr_ka_time += new.fka_period;
1040                         if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1041                                 mod_timer(&fip->timer, fip->ctlr_ka_time);
1042                 }
1043                 fcf->fka_period = new.fka_period;
1044                 memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
1045         }
1046
1047         mtu_valid = fcoe_ctlr_mtu_valid(fcf);
1048         fcf->time = jiffies;
1049         if (!found)
1050                 LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
1051                                 fcf->fabric_name, fcf->fcf_mac);
1052
1053         /*
1054          * If this advertisement is not solicited and our max receive size
1055          * hasn't been verified, send a solicited advertisement.
1056          */
1057         if (!mtu_valid)
1058                 fcoe_ctlr_solicit(fip, fcf);
1059
1060         /*
1061          * If its been a while since we did a solicit, and this is
1062          * the first advertisement we've received, do a multicast
1063          * solicitation to gather as many advertisements as we can
1064          * before selection occurs.
1065          */
1066         if (first && time_after(jiffies, fip->sol_time + sol_tov))
1067                 fcoe_ctlr_solicit(fip, NULL);
1068
1069         /*
1070          * Put this FCF at the head of the list for priority among equals.
1071          * This helps in the case of an NPV switch which insists we use
1072          * the FCF that answers multicast solicitations, not the others that
1073          * are sending periodic multicast advertisements.
1074          */
1075         if (mtu_valid)
1076                 list_move(&fcf->list, &fip->fcfs);
1077
1078         /*
1079          * If this is the first validated FCF, note the time and
1080          * set a timer to trigger selection.
1081          */
1082         if (mtu_valid && !fip->sel_fcf && fcoe_ctlr_fcf_usable(fcf)) {
1083                 fip->sel_time = jiffies +
1084                         msecs_to_jiffies(FCOE_CTLR_START_DELAY);
1085                 if (!timer_pending(&fip->timer) ||
1086                     time_before(fip->sel_time, fip->timer.expires))
1087                         mod_timer(&fip->timer, fip->sel_time);
1088         }
1089
1090 out:
1091         mutex_unlock(&fip->ctlr_mutex);
1092 }
1093
1094 /**
1095  * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
1096  * @fip: The FCoE controller which received the packet
1097  * @skb: The received FIP packet
1098  */
1099 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
1100 {
1101         struct fc_lport *lport = fip->lp;
1102         struct fip_header *fiph;
1103         struct fc_frame *fp = (struct fc_frame *)skb;
1104         struct fc_frame_header *fh = NULL;
1105         struct fip_desc *desc;
1106         struct fip_encaps *els;
1107         struct fcoe_fcf *sel;
1108         struct fc_stats *stats;
1109         enum fip_desc_type els_dtype = 0;
1110         u8 els_op;
1111         u8 sub;
1112         u8 granted_mac[ETH_ALEN] = { 0 };
1113         size_t els_len = 0;
1114         size_t rlen;
1115         size_t dlen;
1116         u32 desc_mask = 0;
1117         u32 desc_cnt = 0;
1118
1119         fiph = (struct fip_header *)skb->data;
1120         sub = fiph->fip_subcode;
1121         if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
1122                 goto drop;
1123
1124         rlen = ntohs(fiph->fip_dl_len) * 4;
1125         if (rlen + sizeof(*fiph) > skb->len)
1126                 goto drop;
1127
1128         desc = (struct fip_desc *)(fiph + 1);
1129         while (rlen > 0) {
1130                 desc_cnt++;
1131                 dlen = desc->fip_dlen * FIP_BPW;
1132                 if (dlen < sizeof(*desc) || dlen > rlen)
1133                         goto drop;
1134                 /* Drop ELS if there are duplicate critical descriptors */
1135                 if (desc->fip_dtype < 32) {
1136                         if ((desc->fip_dtype != FIP_DT_MAC) &&
1137                             (desc_mask & 1U << desc->fip_dtype)) {
1138                                 LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1139                                                 "Descriptors in FIP ELS\n");
1140                                 goto drop;
1141                         }
1142                         desc_mask |= (1 << desc->fip_dtype);
1143                 }
1144                 switch (desc->fip_dtype) {
1145                 case FIP_DT_MAC:
1146                         sel = fip->sel_fcf;
1147                         if (desc_cnt == 1) {
1148                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1149                                                 "received out of order\n");
1150                                 goto drop;
1151                         }
1152                         /*
1153                          * Some switch implementations send two MAC descriptors,
1154                          * with first MAC(granted_mac) being the FPMA, and the
1155                          * second one(fcoe_mac) is used as destination address
1156                          * for sending/receiving FCoE packets. FIP traffic is
1157                          * sent using fip_mac. For regular switches, both
1158                          * fip_mac and fcoe_mac would be the same.
1159                          */
1160                         if (desc_cnt == 2)
1161                                 memcpy(granted_mac,
1162                                        ((struct fip_mac_desc *)desc)->fd_mac,
1163                                        ETH_ALEN);
1164
1165                         if (dlen != sizeof(struct fip_mac_desc))
1166                                 goto len_err;
1167
1168                         if ((desc_cnt == 3) && (sel))
1169                                 memcpy(sel->fcoe_mac,
1170                                        ((struct fip_mac_desc *)desc)->fd_mac,
1171                                        ETH_ALEN);
1172                         break;
1173                 case FIP_DT_FLOGI:
1174                 case FIP_DT_FDISC:
1175                 case FIP_DT_LOGO:
1176                 case FIP_DT_ELP:
1177                         if (desc_cnt != 1) {
1178                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1179                                                 "received out of order\n");
1180                                 goto drop;
1181                         }
1182                         if (fh)
1183                                 goto drop;
1184                         if (dlen < sizeof(*els) + sizeof(*fh) + 1)
1185                                 goto len_err;
1186                         els_len = dlen - sizeof(*els);
1187                         els = (struct fip_encaps *)desc;
1188                         fh = (struct fc_frame_header *)(els + 1);
1189                         els_dtype = desc->fip_dtype;
1190                         break;
1191                 default:
1192                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
1193                                         "in FIP adv\n", desc->fip_dtype);
1194                         /* standard says ignore unknown descriptors >= 128 */
1195                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1196                                 goto drop;
1197                         if (desc_cnt <= 2) {
1198                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1199                                                 "received out of order\n");
1200                                 goto drop;
1201                         }
1202                         break;
1203                 }
1204                 desc = (struct fip_desc *)((char *)desc + dlen);
1205                 rlen -= dlen;
1206         }
1207
1208         if (!fh)
1209                 goto drop;
1210         els_op = *(u8 *)(fh + 1);
1211
1212         if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) &&
1213             sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) {
1214                 if (els_op == ELS_LS_ACC) {
1215                         if (!is_valid_ether_addr(granted_mac)) {
1216                                 LIBFCOE_FIP_DBG(fip,
1217                                         "Invalid MAC address %pM in FIP ELS\n",
1218                                         granted_mac);
1219                                 goto drop;
1220                         }
1221                         memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
1222
1223                         if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1224                                 fip->flogi_oxid = FC_XID_UNKNOWN;
1225                                 if (els_dtype == FIP_DT_FLOGI)
1226                                         fcoe_ctlr_announce(fip);
1227                         }
1228                 } else if (els_dtype == FIP_DT_FLOGI &&
1229                            !fcoe_ctlr_flogi_retry(fip))
1230                         goto drop;      /* retrying FLOGI so drop reject */
1231         }
1232
1233         if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
1234             (!(1U << FIP_DT_MAC & desc_mask)))) {
1235                 LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
1236                                 "in FIP ELS\n");
1237                 goto drop;
1238         }
1239
1240         /*
1241          * Convert skb into an fc_frame containing only the ELS.
1242          */
1243         skb_pull(skb, (u8 *)fh - skb->data);
1244         skb_trim(skb, els_len);
1245         fp = (struct fc_frame *)skb;
1246         fc_frame_init(fp);
1247         fr_sof(fp) = FC_SOF_I3;
1248         fr_eof(fp) = FC_EOF_T;
1249         fr_dev(fp) = lport;
1250         fr_encaps(fp) = els_dtype;
1251
1252         stats = per_cpu_ptr(lport->stats, get_cpu());
1253         stats->RxFrames++;
1254         stats->RxWords += skb->len / FIP_BPW;
1255         put_cpu();
1256
1257         fc_exch_recv(lport, fp);
1258         return;
1259
1260 len_err:
1261         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1262                         desc->fip_dtype, dlen);
1263 drop:
1264         kfree_skb(skb);
1265 }
1266
1267 /**
1268  * fcoe_ctlr_recv_els() - Handle an incoming link reset frame
1269  * @fip: The FCoE controller that received the frame
1270  * @fh:  The received FIP header
1271  *
1272  * There may be multiple VN_Port descriptors.
1273  * The overall length has already been checked.
1274  */
1275 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
1276                                      struct fip_header *fh)
1277 {
1278         struct fip_desc *desc;
1279         struct fip_mac_desc *mp;
1280         struct fip_wwn_desc *wp;
1281         struct fip_vn_desc *vp;
1282         size_t rlen;
1283         size_t dlen;
1284         struct fcoe_fcf *fcf = fip->sel_fcf;
1285         struct fc_lport *lport = fip->lp;
1286         struct fc_lport *vn_port = NULL;
1287         u32 desc_mask;
1288         int num_vlink_desc;
1289         int reset_phys_port = 0;
1290         struct fip_vn_desc **vlink_desc_arr = NULL;
1291
1292         LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
1293
1294         if (!fcf || !lport->port_id)
1295                 return;
1296
1297         /*
1298          * mask of required descriptors.  Validating each one clears its bit.
1299          */
1300         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
1301
1302         rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
1303         desc = (struct fip_desc *)(fh + 1);
1304
1305         /*
1306          * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
1307          * before determining max Vx_Port descriptor but a buggy FCF could have
1308          * omited either or both MAC Address and Name Identifier descriptors
1309          */
1310         num_vlink_desc = rlen / sizeof(*vp);
1311         if (num_vlink_desc)
1312                 vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc,
1313                                          GFP_ATOMIC);
1314         if (!vlink_desc_arr)
1315                 return;
1316         num_vlink_desc = 0;
1317
1318         while (rlen >= sizeof(*desc)) {
1319                 dlen = desc->fip_dlen * FIP_BPW;
1320                 if (dlen > rlen)
1321                         goto err;
1322                 /* Drop CVL if there are duplicate critical descriptors */
1323                 if ((desc->fip_dtype < 32) &&
1324                     (desc->fip_dtype != FIP_DT_VN_ID) &&
1325                     !(desc_mask & 1U << desc->fip_dtype)) {
1326                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1327                                         "Descriptors in FIP CVL\n");
1328                         goto err;
1329                 }
1330                 switch (desc->fip_dtype) {
1331                 case FIP_DT_MAC:
1332                         mp = (struct fip_mac_desc *)desc;
1333                         if (dlen < sizeof(*mp))
1334                                 goto err;
1335                         if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
1336                                 goto err;
1337                         desc_mask &= ~BIT(FIP_DT_MAC);
1338                         break;
1339                 case FIP_DT_NAME:
1340                         wp = (struct fip_wwn_desc *)desc;
1341                         if (dlen < sizeof(*wp))
1342                                 goto err;
1343                         if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
1344                                 goto err;
1345                         desc_mask &= ~BIT(FIP_DT_NAME);
1346                         break;
1347                 case FIP_DT_VN_ID:
1348                         vp = (struct fip_vn_desc *)desc;
1349                         if (dlen < sizeof(*vp))
1350                                 goto err;
1351                         vlink_desc_arr[num_vlink_desc++] = vp;
1352                         vn_port = fc_vport_id_lookup(lport,
1353                                                       ntoh24(vp->fd_fc_id));
1354                         if (vn_port && (vn_port == lport)) {
1355                                 mutex_lock(&fip->ctlr_mutex);
1356                                 per_cpu_ptr(lport->stats,
1357                                             get_cpu())->VLinkFailureCount++;
1358                                 put_cpu();
1359                                 fcoe_ctlr_reset(fip);
1360                                 mutex_unlock(&fip->ctlr_mutex);
1361                         }
1362                         break;
1363                 default:
1364                         /* standard says ignore unknown descriptors >= 128 */
1365                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1366                                 goto err;
1367                         break;
1368                 }
1369                 desc = (struct fip_desc *)((char *)desc + dlen);
1370                 rlen -= dlen;
1371         }
1372
1373         /*
1374          * reset only if all required descriptors were present and valid.
1375          */
1376         if (desc_mask)
1377                 LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
1378                                 desc_mask);
1379         else if (!num_vlink_desc) {
1380                 LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
1381                 /*
1382                  * No Vx_Port description. Clear all NPIV ports,
1383                  * followed by physical port
1384                  */
1385                 mutex_lock(&fip->ctlr_mutex);
1386                 per_cpu_ptr(lport->stats, get_cpu())->VLinkFailureCount++;
1387                 put_cpu();
1388                 fcoe_ctlr_reset(fip);
1389                 mutex_unlock(&fip->ctlr_mutex);
1390
1391                 mutex_lock(&lport->lp_mutex);
1392                 list_for_each_entry(vn_port, &lport->vports, list)
1393                         fc_lport_reset(vn_port);
1394                 mutex_unlock(&lport->lp_mutex);
1395
1396                 fc_lport_reset(fip->lp);
1397                 fcoe_ctlr_solicit(fip, NULL);
1398         } else {
1399                 int i;
1400
1401                 LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
1402                 for (i = 0; i < num_vlink_desc; i++) {
1403                         vp = vlink_desc_arr[i];
1404                         vn_port = fc_vport_id_lookup(lport,
1405                                                      ntoh24(vp->fd_fc_id));
1406                         if (!vn_port)
1407                                 continue;
1408
1409                         /*
1410                          * 'port_id' is already validated, check MAC address and
1411                          * wwpn
1412                          */
1413                         if (compare_ether_addr(fip->get_src_addr(vn_port),
1414                                                 vp->fd_mac) != 0 ||
1415                                 get_unaligned_be64(&vp->fd_wwpn) !=
1416                                                         vn_port->wwpn)
1417                                 continue;
1418
1419                         if (vn_port == lport)
1420                                 /*
1421                                  * Physical port, defer processing till all
1422                                  * listed NPIV ports are cleared
1423                                  */
1424                                 reset_phys_port = 1;
1425                         else    /* NPIV port */
1426                                 fc_lport_reset(vn_port);
1427                 }
1428
1429                 if (reset_phys_port) {
1430                         fc_lport_reset(fip->lp);
1431                         fcoe_ctlr_solicit(fip, NULL);
1432                 }
1433         }
1434
1435 err:
1436         kfree(vlink_desc_arr);
1437 }
1438
1439 /**
1440  * fcoe_ctlr_recv() - Receive a FIP packet
1441  * @fip: The FCoE controller that received the packet
1442  * @skb: The received FIP packet
1443  *
1444  * This may be called from either NET_RX_SOFTIRQ or IRQ.
1445  */
1446 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1447 {
1448         skb_queue_tail(&fip->fip_recv_list, skb);
1449         schedule_work(&fip->recv_work);
1450 }
1451 EXPORT_SYMBOL(fcoe_ctlr_recv);
1452
1453 /**
1454  * fcoe_ctlr_recv_handler() - Receive a FIP frame
1455  * @fip: The FCoE controller that received the frame
1456  * @skb: The received FIP frame
1457  *
1458  * Returns non-zero if the frame is dropped.
1459  */
1460 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
1461 {
1462         struct fip_header *fiph;
1463         struct ethhdr *eh;
1464         enum fip_state state;
1465         u16 op;
1466         u8 sub;
1467
1468         if (skb_linearize(skb))
1469                 goto drop;
1470         if (skb->len < sizeof(*fiph))
1471                 goto drop;
1472         eh = eth_hdr(skb);
1473         if (fip->mode == FIP_MODE_VN2VN) {
1474                 if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1475                     compare_ether_addr(eh->h_dest, fcoe_all_vn2vn) &&
1476                     compare_ether_addr(eh->h_dest, fcoe_all_p2p))
1477                         goto drop;
1478         } else if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1479                    compare_ether_addr(eh->h_dest, fcoe_all_enode))
1480                 goto drop;
1481         fiph = (struct fip_header *)skb->data;
1482         op = ntohs(fiph->fip_op);
1483         sub = fiph->fip_subcode;
1484
1485         if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
1486                 goto drop;
1487         if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
1488                 goto drop;
1489
1490         mutex_lock(&fip->ctlr_mutex);
1491         state = fip->state;
1492         if (state == FIP_ST_AUTO) {
1493                 fip->map_dest = 0;
1494                 fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
1495                 state = FIP_ST_ENABLED;
1496                 LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
1497         }
1498         mutex_unlock(&fip->ctlr_mutex);
1499
1500         if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
1501                 return fcoe_ctlr_vn_recv(fip, skb);
1502
1503         if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
1504             state != FIP_ST_VNMP_CLAIM)
1505                 goto drop;
1506
1507         if (op == FIP_OP_LS) {
1508                 fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
1509                 return 0;
1510         }
1511
1512         if (state != FIP_ST_ENABLED)
1513                 goto drop;
1514
1515         if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
1516                 fcoe_ctlr_recv_adv(fip, skb);
1517         else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
1518                 fcoe_ctlr_recv_clr_vlink(fip, fiph);
1519         kfree_skb(skb);
1520         return 0;
1521 drop:
1522         kfree_skb(skb);
1523         return -1;
1524 }
1525
1526 /**
1527  * fcoe_ctlr_select() - Select the best FCF (if possible)
1528  * @fip: The FCoE controller
1529  *
1530  * Returns the selected FCF, or NULL if none are usable.
1531  *
1532  * If there are conflicting advertisements, no FCF can be chosen.
1533  *
1534  * If there is already a selected FCF, this will choose a better one or
1535  * an equivalent one that hasn't already been sent a FLOGI.
1536  *
1537  * Called with lock held.
1538  */
1539 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
1540 {
1541         struct fcoe_fcf *fcf;
1542         struct fcoe_fcf *best = fip->sel_fcf;
1543         struct fcoe_fcf *first;
1544
1545         first = list_first_entry(&fip->fcfs, struct fcoe_fcf, list);
1546
1547         list_for_each_entry(fcf, &fip->fcfs, list) {
1548                 LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
1549                                 "VFID %d mac %pM map %x val %d "
1550                                 "sent %u pri %u\n",
1551                                 fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
1552                                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
1553                                 fcf->flogi_sent, fcf->pri);
1554                 if (fcf->fabric_name != first->fabric_name ||
1555                     fcf->vfid != first->vfid ||
1556                     fcf->fc_map != first->fc_map) {
1557                         LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
1558                                         "or FC-MAP\n");
1559                         return NULL;
1560                 }
1561                 if (fcf->flogi_sent)
1562                         continue;
1563                 if (!fcoe_ctlr_fcf_usable(fcf)) {
1564                         LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
1565                                         "map %x %svalid %savailable\n",
1566                                         fcf->fabric_name, fcf->fc_map,
1567                                         (fcf->flags & FIP_FL_SOL) ? "" : "in",
1568                                         (fcf->flags & FIP_FL_AVAIL) ?
1569                                         "" : "un");
1570                         continue;
1571                 }
1572                 if (!best || fcf->pri < best->pri || best->flogi_sent)
1573                         best = fcf;
1574         }
1575         fip->sel_fcf = best;
1576         if (best) {
1577                 LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
1578                 fip->port_ka_time = jiffies +
1579                         msecs_to_jiffies(FIP_VN_KA_PERIOD);
1580                 fip->ctlr_ka_time = jiffies + best->fka_period;
1581                 if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1582                         mod_timer(&fip->timer, fip->ctlr_ka_time);
1583         }
1584         return best;
1585 }
1586
1587 /**
1588  * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
1589  * @fip: The FCoE controller
1590  *
1591  * Returns non-zero error if it could not be sent.
1592  *
1593  * Called with ctlr_mutex and ctlr_lock held.
1594  * Caller must verify that fip->sel_fcf is not NULL.
1595  */
1596 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
1597 {
1598         struct sk_buff *skb;
1599         struct sk_buff *skb_orig;
1600         struct fc_frame_header *fh;
1601         int error;
1602
1603         skb_orig = fip->flogi_req;
1604         if (!skb_orig)
1605                 return -EINVAL;
1606
1607         /*
1608          * Clone and send the FLOGI request.  If clone fails, use original.
1609          */
1610         skb = skb_clone(skb_orig, GFP_ATOMIC);
1611         if (!skb) {
1612                 skb = skb_orig;
1613                 fip->flogi_req = NULL;
1614         }
1615         fh = (struct fc_frame_header *)skb->data;
1616         error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
1617                                  ntoh24(fh->fh_d_id));
1618         if (error) {
1619                 kfree_skb(skb);
1620                 return error;
1621         }
1622         fip->send(fip, skb);
1623         fip->sel_fcf->flogi_sent = 1;
1624         return 0;
1625 }
1626
1627 /**
1628  * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
1629  * @fip: The FCoE controller
1630  *
1631  * Returns non-zero error code if there's no FLOGI request to retry or
1632  * no alternate FCF available.
1633  */
1634 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
1635 {
1636         struct fcoe_fcf *fcf;
1637         int error;
1638
1639         mutex_lock(&fip->ctlr_mutex);
1640         spin_lock_bh(&fip->ctlr_lock);
1641         LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
1642         fcf = fcoe_ctlr_select(fip);
1643         if (!fcf || fcf->flogi_sent) {
1644                 kfree_skb(fip->flogi_req);
1645                 fip->flogi_req = NULL;
1646                 error = -ENOENT;
1647         } else {
1648                 fcoe_ctlr_solicit(fip, NULL);
1649                 error = fcoe_ctlr_flogi_send_locked(fip);
1650         }
1651         spin_unlock_bh(&fip->ctlr_lock);
1652         mutex_unlock(&fip->ctlr_mutex);
1653         return error;
1654 }
1655
1656
1657 /**
1658  * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
1659  * @fip: The FCoE controller that timed out
1660  *
1661  * Done here because fcoe_ctlr_els_send() can't get mutex.
1662  *
1663  * Called with ctlr_mutex held.  The caller must not hold ctlr_lock.
1664  */
1665 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
1666 {
1667         struct fcoe_fcf *fcf;
1668
1669         spin_lock_bh(&fip->ctlr_lock);
1670         fcf = fip->sel_fcf;
1671         if (!fcf || !fip->flogi_req_send)
1672                 goto unlock;
1673
1674         LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
1675
1676         /*
1677          * If this FLOGI is being sent due to a timeout retry
1678          * to the same FCF as before, select a different FCF if possible.
1679          */
1680         if (fcf->flogi_sent) {
1681                 LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
1682                 fcf = fcoe_ctlr_select(fip);
1683                 if (!fcf || fcf->flogi_sent) {
1684                         LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
1685                         list_for_each_entry(fcf, &fip->fcfs, list)
1686                                 fcf->flogi_sent = 0;
1687                         fcf = fcoe_ctlr_select(fip);
1688                 }
1689         }
1690         if (fcf) {
1691                 fcoe_ctlr_flogi_send_locked(fip);
1692                 fip->flogi_req_send = 0;
1693         } else /* XXX */
1694                 LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
1695 unlock:
1696         spin_unlock_bh(&fip->ctlr_lock);
1697 }
1698
1699 /**
1700  * fcoe_ctlr_timeout() - FIP timeout handler
1701  * @arg: The FCoE controller that timed out
1702  */
1703 static void fcoe_ctlr_timeout(unsigned long arg)
1704 {
1705         struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
1706
1707         schedule_work(&fip->timer_work);
1708 }
1709
1710 /**
1711  * fcoe_ctlr_timer_work() - Worker thread function for timer work
1712  * @work: Handle to a FCoE controller
1713  *
1714  * Ages FCFs.  Triggers FCF selection if possible.
1715  * Sends keep-alives and resets.
1716  */
1717 static void fcoe_ctlr_timer_work(struct work_struct *work)
1718 {
1719         struct fcoe_ctlr *fip;
1720         struct fc_lport *vport;
1721         u8 *mac;
1722         u8 reset = 0;
1723         u8 send_ctlr_ka = 0;
1724         u8 send_port_ka = 0;
1725         struct fcoe_fcf *sel;
1726         struct fcoe_fcf *fcf;
1727         unsigned long next_timer;
1728
1729         fip = container_of(work, struct fcoe_ctlr, timer_work);
1730         if (fip->mode == FIP_MODE_VN2VN)
1731                 return fcoe_ctlr_vn_timeout(fip);
1732         mutex_lock(&fip->ctlr_mutex);
1733         if (fip->state == FIP_ST_DISABLED) {
1734                 mutex_unlock(&fip->ctlr_mutex);
1735                 return;
1736         }
1737
1738         fcf = fip->sel_fcf;
1739         next_timer = fcoe_ctlr_age_fcfs(fip);
1740
1741         sel = fip->sel_fcf;
1742         if (!sel && fip->sel_time) {
1743                 if (time_after_eq(jiffies, fip->sel_time)) {
1744                         sel = fcoe_ctlr_select(fip);
1745                         fip->sel_time = 0;
1746                 } else if (time_after(next_timer, fip->sel_time))
1747                         next_timer = fip->sel_time;
1748         }
1749
1750         if (sel && fip->flogi_req_send)
1751                 fcoe_ctlr_flogi_send(fip);
1752         else if (!sel && fcf)
1753                 reset = 1;
1754
1755         if (sel && !sel->fd_flags) {
1756                 if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
1757                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1758                         send_ctlr_ka = 1;
1759                 }
1760                 if (time_after(next_timer, fip->ctlr_ka_time))
1761                         next_timer = fip->ctlr_ka_time;
1762
1763                 if (time_after_eq(jiffies, fip->port_ka_time)) {
1764                         fip->port_ka_time = jiffies +
1765                                 msecs_to_jiffies(FIP_VN_KA_PERIOD);
1766                         send_port_ka = 1;
1767                 }
1768                 if (time_after(next_timer, fip->port_ka_time))
1769                         next_timer = fip->port_ka_time;
1770         }
1771         if (!list_empty(&fip->fcfs))
1772                 mod_timer(&fip->timer, next_timer);
1773         mutex_unlock(&fip->ctlr_mutex);
1774
1775         if (reset) {
1776                 fc_lport_reset(fip->lp);
1777                 /* restart things with a solicitation */
1778                 fcoe_ctlr_solicit(fip, NULL);
1779         }
1780
1781         if (send_ctlr_ka)
1782                 fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
1783
1784         if (send_port_ka) {
1785                 mutex_lock(&fip->lp->lp_mutex);
1786                 mac = fip->get_src_addr(fip->lp);
1787                 fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
1788                 list_for_each_entry(vport, &fip->lp->vports, list) {
1789                         mac = fip->get_src_addr(vport);
1790                         fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
1791                 }
1792                 mutex_unlock(&fip->lp->lp_mutex);
1793         }
1794 }
1795
1796 /**
1797  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
1798  * @recv_work: Handle to a FCoE controller
1799  */
1800 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
1801 {
1802         struct fcoe_ctlr *fip;
1803         struct sk_buff *skb;
1804
1805         fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1806         while ((skb = skb_dequeue(&fip->fip_recv_list)))
1807                 fcoe_ctlr_recv_handler(fip, skb);
1808 }
1809
1810 /**
1811  * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
1812  * @fip: The FCoE controller
1813  * @fp:  The FC frame to snoop
1814  *
1815  * Snoop potential response to FLOGI or even incoming FLOGI.
1816  *
1817  * The caller has checked that we are waiting for login as indicated
1818  * by fip->flogi_oxid != FC_XID_UNKNOWN.
1819  *
1820  * The caller is responsible for freeing the frame.
1821  * Fill in the granted_mac address.
1822  *
1823  * Return non-zero if the frame should not be delivered to libfc.
1824  */
1825 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
1826                          struct fc_frame *fp)
1827 {
1828         struct fc_frame_header *fh;
1829         u8 op;
1830         u8 *sa;
1831
1832         sa = eth_hdr(&fp->skb)->h_source;
1833         fh = fc_frame_header_get(fp);
1834         if (fh->fh_type != FC_TYPE_ELS)
1835                 return 0;
1836
1837         op = fc_frame_payload_op(fp);
1838         if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
1839             fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1840
1841                 mutex_lock(&fip->ctlr_mutex);
1842                 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
1843                         mutex_unlock(&fip->ctlr_mutex);
1844                         return -EINVAL;
1845                 }
1846                 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1847                 LIBFCOE_FIP_DBG(fip,
1848                                 "received FLOGI LS_ACC using non-FIP mode\n");
1849
1850                 /*
1851                  * FLOGI accepted.
1852                  * If the src mac addr is FC_OUI-based, then we mark the
1853                  * address_mode flag to use FC_OUI-based Ethernet DA.
1854                  * Otherwise we use the FCoE gateway addr
1855                  */
1856                 if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
1857                         fcoe_ctlr_map_dest(fip);
1858                 } else {
1859                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1860                         fip->map_dest = 0;
1861                 }
1862                 fip->flogi_oxid = FC_XID_UNKNOWN;
1863                 mutex_unlock(&fip->ctlr_mutex);
1864                 fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
1865         } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
1866                 /*
1867                  * Save source MAC for point-to-point responses.
1868                  */
1869                 mutex_lock(&fip->ctlr_mutex);
1870                 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
1871                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1872                         fip->map_dest = 0;
1873                         if (fip->state == FIP_ST_AUTO)
1874                                 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
1875                                                 "Setting non-FIP mode\n");
1876                         fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1877                 }
1878                 mutex_unlock(&fip->ctlr_mutex);
1879         }
1880         return 0;
1881 }
1882 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
1883
1884 /**
1885  * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
1886  * @mac:    The MAC address to convert
1887  * @scheme: The scheme to use when converting
1888  * @port:   The port indicator for converting
1889  *
1890  * Returns: u64 fc world wide name
1891  */
1892 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1893                       unsigned int scheme, unsigned int port)
1894 {
1895         u64 wwn;
1896         u64 host_mac;
1897
1898         /* The MAC is in NO, so flip only the low 48 bits */
1899         host_mac = ((u64) mac[0] << 40) |
1900                 ((u64) mac[1] << 32) |
1901                 ((u64) mac[2] << 24) |
1902                 ((u64) mac[3] << 16) |
1903                 ((u64) mac[4] << 8) |
1904                 (u64) mac[5];
1905
1906         WARN_ON(host_mac >= (1ULL << 48));
1907         wwn = host_mac | ((u64) scheme << 60);
1908         switch (scheme) {
1909         case 1:
1910                 WARN_ON(port != 0);
1911                 break;
1912         case 2:
1913                 WARN_ON(port >= 0xfff);
1914                 wwn |= (u64) port << 48;
1915                 break;
1916         default:
1917                 WARN_ON(1);
1918                 break;
1919         }
1920
1921         return wwn;
1922 }
1923 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1924
1925 /**
1926  * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
1927  * @rdata: libfc remote port
1928  */
1929 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
1930 {
1931         return (struct fcoe_rport *)(rdata + 1);
1932 }
1933
1934 /**
1935  * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
1936  * @fip: The FCoE controller
1937  * @sub: sub-opcode for probe request, reply, or advertisement.
1938  * @dest: The destination Ethernet MAC address
1939  * @min_len: minimum size of the Ethernet payload to be sent
1940  */
1941 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
1942                               enum fip_vn2vn_subcode sub,
1943                               const u8 *dest, size_t min_len)
1944 {
1945         struct sk_buff *skb;
1946         struct fip_frame {
1947                 struct ethhdr eth;
1948                 struct fip_header fip;
1949                 struct fip_mac_desc mac;
1950                 struct fip_wwn_desc wwnn;
1951                 struct fip_vn_desc vn;
1952         } __packed * frame;
1953         struct fip_fc4_feat *ff;
1954         struct fip_size_desc *size;
1955         u32 fcp_feat;
1956         size_t len;
1957         size_t dlen;
1958
1959         len = sizeof(*frame);
1960         dlen = 0;
1961         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
1962                 dlen = sizeof(struct fip_fc4_feat) +
1963                        sizeof(struct fip_size_desc);
1964                 len += dlen;
1965         }
1966         dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
1967         len = max(len, min_len + sizeof(struct ethhdr));
1968
1969         skb = dev_alloc_skb(len);
1970         if (!skb)
1971                 return;
1972
1973         frame = (struct fip_frame *)skb->data;
1974         memset(frame, 0, len);
1975         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
1976
1977         if (sub == FIP_SC_VN_BEACON) {
1978                 hton24(frame->eth.h_source, FIP_VN_FC_MAP);
1979                 hton24(frame->eth.h_source + 3, fip->port_id);
1980         } else {
1981                 memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
1982         }
1983         frame->eth.h_proto = htons(ETH_P_FIP);
1984
1985         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
1986         frame->fip.fip_op = htons(FIP_OP_VN2VN);
1987         frame->fip.fip_subcode = sub;
1988         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
1989
1990         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
1991         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
1992         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
1993
1994         frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
1995         frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
1996         put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
1997
1998         frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
1999         frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
2000         hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
2001         hton24(frame->vn.fd_mac + 3, fip->port_id);
2002         hton24(frame->vn.fd_fc_id, fip->port_id);
2003         put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
2004
2005         /*
2006          * For claims, add FC-4 features.
2007          * TBD: Add interface to get fc-4 types and features from libfc.
2008          */
2009         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
2010                 ff = (struct fip_fc4_feat *)(frame + 1);
2011                 ff->fd_desc.fip_dtype = FIP_DT_FC4F;
2012                 ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
2013                 ff->fd_fts = fip->lp->fcts;
2014
2015                 fcp_feat = 0;
2016                 if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
2017                         fcp_feat |= FCP_FEAT_INIT;
2018                 if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
2019                         fcp_feat |= FCP_FEAT_TARG;
2020                 fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
2021                 ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
2022
2023                 size = (struct fip_size_desc *)(ff + 1);
2024                 size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
2025                 size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
2026                 size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
2027         }
2028
2029         skb_put(skb, len);
2030         skb->protocol = htons(ETH_P_FIP);
2031         skb->priority = fip->priority;
2032         skb_reset_mac_header(skb);
2033         skb_reset_network_header(skb);
2034
2035         fip->send(fip, skb);
2036 }
2037
2038 /**
2039  * fcoe_ctlr_vn_rport_callback - Event handler for rport events.
2040  * @lport: The lport which is receiving the event
2041  * @rdata: remote port private data
2042  * @event: The event that occurred
2043  *
2044  * Locking Note:  The rport lock must not be held when calling this function.
2045  */
2046 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
2047                                         struct fc_rport_priv *rdata,
2048                                         enum fc_rport_event event)
2049 {
2050         struct fcoe_ctlr *fip = lport->disc.priv;
2051         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2052
2053         LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
2054                         rdata->ids.port_id, event);
2055
2056         mutex_lock(&fip->ctlr_mutex);
2057         switch (event) {
2058         case RPORT_EV_READY:
2059                 frport->login_count = 0;
2060                 break;
2061         case RPORT_EV_LOGO:
2062         case RPORT_EV_FAILED:
2063         case RPORT_EV_STOP:
2064                 frport->login_count++;
2065                 if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
2066                         LIBFCOE_FIP_DBG(fip,
2067                                         "rport FLOGI limited port_id %6.6x\n",
2068                                         rdata->ids.port_id);
2069                         lport->tt.rport_logoff(rdata);
2070                 }
2071                 break;
2072         default:
2073                 break;
2074         }
2075         mutex_unlock(&fip->ctlr_mutex);
2076 }
2077
2078 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
2079         .event_callback = fcoe_ctlr_vn_rport_callback,
2080 };
2081
2082 /**
2083  * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
2084  * @fip: The FCoE controller
2085  *
2086  * Called with ctlr_mutex held.
2087  */
2088 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
2089 {
2090         mutex_lock(&lport->disc.disc_mutex);
2091         lport->disc.disc_callback = NULL;
2092         mutex_unlock(&lport->disc.disc_mutex);
2093 }
2094
2095 /**
2096  * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
2097  * @fip: The FCoE controller
2098  *
2099  * Called through the local port template for discovery.
2100  * Called without the ctlr_mutex held.
2101  */
2102 static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
2103 {
2104         struct fcoe_ctlr *fip = lport->disc.priv;
2105
2106         mutex_lock(&fip->ctlr_mutex);
2107         fcoe_ctlr_disc_stop_locked(lport);
2108         mutex_unlock(&fip->ctlr_mutex);
2109 }
2110
2111 /**
2112  * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
2113  * @fip: The FCoE controller
2114  *
2115  * Called through the local port template for discovery.
2116  * Called without the ctlr_mutex held.
2117  */
2118 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
2119 {
2120         fcoe_ctlr_disc_stop(lport);
2121         lport->tt.rport_flush_queue();
2122         synchronize_rcu();
2123 }
2124
2125 /**
2126  * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
2127  * @fip: The FCoE controller
2128  *
2129  * Called with fcoe_ctlr lock held.
2130  */
2131 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
2132 {
2133         unsigned long wait;
2134         u32 port_id;
2135
2136         fcoe_ctlr_disc_stop_locked(fip->lp);
2137
2138         /*
2139          * Get proposed port ID.
2140          * If this is the first try after link up, use any previous port_id.
2141          * If there was none, use the low bits of the port_name.
2142          * On subsequent tries, get the next random one.
2143          * Don't use reserved IDs, use another non-zero value, just as random.
2144          */
2145         port_id = fip->port_id;
2146         if (fip->probe_tries)
2147                 port_id = prandom_u32_state(&fip->rnd_state) & 0xffff;
2148         else if (!port_id)
2149                 port_id = fip->lp->wwpn & 0xffff;
2150         if (!port_id || port_id == 0xffff)
2151                 port_id = 1;
2152         fip->port_id = port_id;
2153
2154         if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
2155                 fip->probe_tries++;
2156                 wait = random32() % FIP_VN_PROBE_WAIT;
2157         } else
2158                 wait = FIP_VN_RLIM_INT;
2159         mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
2160         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
2161 }
2162
2163 /**
2164  * fcoe_ctlr_vn_start() - Start in VN2VN mode
2165  * @fip: The FCoE controller
2166  *
2167  * Called with fcoe_ctlr lock held.
2168  */
2169 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
2170 {
2171         fip->probe_tries = 0;
2172         prandom_seed_state(&fip->rnd_state, fip->lp->wwpn);
2173         fcoe_ctlr_vn_restart(fip);
2174 }
2175
2176 /**
2177  * fcoe_ctlr_vn_parse - parse probe request or response
2178  * @fip: The FCoE controller
2179  * @skb: incoming packet
2180  * @rdata: buffer for resulting parsed VN entry plus fcoe_rport
2181  *
2182  * Returns non-zero error number on error.
2183  * Does not consume the packet.
2184  */
2185 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
2186                               struct sk_buff *skb,
2187                               struct fc_rport_priv *rdata)
2188 {
2189         struct fip_header *fiph;
2190         struct fip_desc *desc = NULL;
2191         struct fip_mac_desc *macd = NULL;
2192         struct fip_wwn_desc *wwn = NULL;
2193         struct fip_vn_desc *vn = NULL;
2194         struct fip_size_desc *size = NULL;
2195         struct fcoe_rport *frport;
2196         size_t rlen;
2197         size_t dlen;
2198         u32 desc_mask = 0;
2199         u32 dtype;
2200         u8 sub;
2201
2202         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2203         frport = fcoe_ctlr_rport(rdata);
2204
2205         fiph = (struct fip_header *)skb->data;
2206         frport->flags = ntohs(fiph->fip_flags);
2207
2208         sub = fiph->fip_subcode;
2209         switch (sub) {
2210         case FIP_SC_VN_PROBE_REQ:
2211         case FIP_SC_VN_PROBE_REP:
2212         case FIP_SC_VN_BEACON:
2213                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2214                             BIT(FIP_DT_VN_ID);
2215                 break;
2216         case FIP_SC_VN_CLAIM_NOTIFY:
2217         case FIP_SC_VN_CLAIM_REP:
2218                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2219                             BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
2220                             BIT(FIP_DT_FCOE_SIZE);
2221                 break;
2222         default:
2223                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2224                 return -EINVAL;
2225         }
2226
2227         rlen = ntohs(fiph->fip_dl_len) * 4;
2228         if (rlen + sizeof(*fiph) > skb->len)
2229                 return -EINVAL;
2230
2231         desc = (struct fip_desc *)(fiph + 1);
2232         while (rlen > 0) {
2233                 dlen = desc->fip_dlen * FIP_BPW;
2234                 if (dlen < sizeof(*desc) || dlen > rlen)
2235                         return -EINVAL;
2236
2237                 dtype = desc->fip_dtype;
2238                 if (dtype < 32) {
2239                         if (!(desc_mask & BIT(dtype))) {
2240                                 LIBFCOE_FIP_DBG(fip,
2241                                                 "unexpected or duplicated desc "
2242                                                 "desc type %u in "
2243                                                 "FIP VN2VN subtype %u\n",
2244                                                 dtype, sub);
2245                                 return -EINVAL;
2246                         }
2247                         desc_mask &= ~BIT(dtype);
2248                 }
2249
2250                 switch (dtype) {
2251                 case FIP_DT_MAC:
2252                         if (dlen != sizeof(struct fip_mac_desc))
2253                                 goto len_err;
2254                         macd = (struct fip_mac_desc *)desc;
2255                         if (!is_valid_ether_addr(macd->fd_mac)) {
2256                                 LIBFCOE_FIP_DBG(fip,
2257                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2258                                          macd->fd_mac);
2259                                 return -EINVAL;
2260                         }
2261                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2262                         break;
2263                 case FIP_DT_NAME:
2264                         if (dlen != sizeof(struct fip_wwn_desc))
2265                                 goto len_err;
2266                         wwn = (struct fip_wwn_desc *)desc;
2267                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2268                         break;
2269                 case FIP_DT_VN_ID:
2270                         if (dlen != sizeof(struct fip_vn_desc))
2271                                 goto len_err;
2272                         vn = (struct fip_vn_desc *)desc;
2273                         memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
2274                         rdata->ids.port_id = ntoh24(vn->fd_fc_id);
2275                         rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn);
2276                         break;
2277                 case FIP_DT_FC4F:
2278                         if (dlen != sizeof(struct fip_fc4_feat))
2279                                 goto len_err;
2280                         break;
2281                 case FIP_DT_FCOE_SIZE:
2282                         if (dlen != sizeof(struct fip_size_desc))
2283                                 goto len_err;
2284                         size = (struct fip_size_desc *)desc;
2285                         frport->fcoe_len = ntohs(size->fd_size);
2286                         break;
2287                 default:
2288                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2289                                         "in FIP probe\n", dtype);
2290                         /* standard says ignore unknown descriptors >= 128 */
2291                         if (dtype < FIP_DT_VENDOR_BASE)
2292                                 return -EINVAL;
2293                         break;
2294                 }
2295                 desc = (struct fip_desc *)((char *)desc + dlen);
2296                 rlen -= dlen;
2297         }
2298         return 0;
2299
2300 len_err:
2301         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2302                         dtype, dlen);
2303         return -EINVAL;
2304 }
2305
2306 /**
2307  * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
2308  * @fip: The FCoE controller
2309  *
2310  * Called with ctlr_mutex held.
2311  */
2312 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
2313 {
2314         fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
2315         fip->sol_time = jiffies;
2316 }
2317
2318 /**
2319  * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
2320  * @fip: The FCoE controller
2321  * @rdata: parsed remote port with frport from the probe request
2322  *
2323  * Called with ctlr_mutex held.
2324  */
2325 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
2326                                    struct fc_rport_priv *rdata)
2327 {
2328         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2329
2330         if (rdata->ids.port_id != fip->port_id)
2331                 return;
2332
2333         switch (fip->state) {
2334         case FIP_ST_VNMP_CLAIM:
2335         case FIP_ST_VNMP_UP:
2336                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2337                                   frport->enode_mac, 0);
2338                 break;
2339         case FIP_ST_VNMP_PROBE1:
2340         case FIP_ST_VNMP_PROBE2:
2341                 /*
2342                  * Decide whether to reply to the Probe.
2343                  * Our selected address is never a "recorded" one, so
2344                  * only reply if our WWPN is greater and the
2345                  * Probe's REC bit is not set.
2346                  * If we don't reply, we will change our address.
2347                  */
2348                 if (fip->lp->wwpn > rdata->ids.port_name &&
2349                     !(frport->flags & FIP_FL_REC_OR_P2P)) {
2350                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2351                                           frport->enode_mac, 0);
2352                         break;
2353                 }
2354                 /* fall through */
2355         case FIP_ST_VNMP_START:
2356                 fcoe_ctlr_vn_restart(fip);
2357                 break;
2358         default:
2359                 break;
2360         }
2361 }
2362
2363 /**
2364  * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
2365  * @fip: The FCoE controller
2366  * @rdata: parsed remote port with frport from the probe request
2367  *
2368  * Called with ctlr_mutex held.
2369  */
2370 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
2371                                    struct fc_rport_priv *rdata)
2372 {
2373         if (rdata->ids.port_id != fip->port_id)
2374                 return;
2375         switch (fip->state) {
2376         case FIP_ST_VNMP_START:
2377         case FIP_ST_VNMP_PROBE1:
2378         case FIP_ST_VNMP_PROBE2:
2379         case FIP_ST_VNMP_CLAIM:
2380                 fcoe_ctlr_vn_restart(fip);
2381                 break;
2382         case FIP_ST_VNMP_UP:
2383                 fcoe_ctlr_vn_send_claim(fip);
2384                 break;
2385         default:
2386                 break;
2387         }
2388 }
2389
2390 /**
2391  * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
2392  * @fip: The FCoE controller
2393  * @new: newly-parsed remote port with frport as a template for new rdata
2394  *
2395  * Called with ctlr_mutex held.
2396  */
2397 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new)
2398 {
2399         struct fc_lport *lport = fip->lp;
2400         struct fc_rport_priv *rdata;
2401         struct fc_rport_identifiers *ids;
2402         struct fcoe_rport *frport;
2403         u32 port_id;
2404
2405         port_id = new->ids.port_id;
2406         if (port_id == fip->port_id)
2407                 return;
2408
2409         mutex_lock(&lport->disc.disc_mutex);
2410         rdata = lport->tt.rport_create(lport, port_id);
2411         if (!rdata) {
2412                 mutex_unlock(&lport->disc.disc_mutex);
2413                 return;
2414         }
2415
2416         rdata->ops = &fcoe_ctlr_vn_rport_ops;
2417         rdata->disc_id = lport->disc.disc_id;
2418
2419         ids = &rdata->ids;
2420         if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) ||
2421             (ids->node_name != -1 && ids->node_name != new->ids.node_name))
2422                 lport->tt.rport_logoff(rdata);
2423         ids->port_name = new->ids.port_name;
2424         ids->node_name = new->ids.node_name;
2425         mutex_unlock(&lport->disc.disc_mutex);
2426
2427         frport = fcoe_ctlr_rport(rdata);
2428         LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s\n",
2429                         port_id, frport->fcoe_len ? "old" : "new");
2430         *frport = *fcoe_ctlr_rport(new);
2431         frport->time = 0;
2432 }
2433
2434 /**
2435  * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
2436  * @fip: The FCoE controller
2437  * @port_id:  The port_id of the remote VN_node
2438  * @mac: buffer which will hold the VN_NODE destination MAC address, if found.
2439  *
2440  * Returns non-zero error if no remote port found.
2441  */
2442 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
2443 {
2444         struct fc_lport *lport = fip->lp;
2445         struct fc_rport_priv *rdata;
2446         struct fcoe_rport *frport;
2447         int ret = -1;
2448
2449         rcu_read_lock();
2450         rdata = lport->tt.rport_lookup(lport, port_id);
2451         if (rdata) {
2452                 frport = fcoe_ctlr_rport(rdata);
2453                 memcpy(mac, frport->enode_mac, ETH_ALEN);
2454                 ret = 0;
2455         }
2456         rcu_read_unlock();
2457         return ret;
2458 }
2459
2460 /**
2461  * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
2462  * @fip: The FCoE controller
2463  * @new: newly-parsed remote port with frport as a template for new rdata
2464  *
2465  * Called with ctlr_mutex held.
2466  */
2467 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
2468                                       struct fc_rport_priv *new)
2469 {
2470         struct fcoe_rport *frport = fcoe_ctlr_rport(new);
2471
2472         if (frport->flags & FIP_FL_REC_OR_P2P) {
2473                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2474                 return;
2475         }
2476         switch (fip->state) {
2477         case FIP_ST_VNMP_START:
2478         case FIP_ST_VNMP_PROBE1:
2479         case FIP_ST_VNMP_PROBE2:
2480                 if (new->ids.port_id == fip->port_id)
2481                         fcoe_ctlr_vn_restart(fip);
2482                 break;
2483         case FIP_ST_VNMP_CLAIM:
2484         case FIP_ST_VNMP_UP:
2485                 if (new->ids.port_id == fip->port_id) {
2486                         if (new->ids.port_name > fip->lp->wwpn) {
2487                                 fcoe_ctlr_vn_restart(fip);
2488                                 break;
2489                         }
2490                         fcoe_ctlr_vn_send_claim(fip);
2491                         break;
2492                 }
2493                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac,
2494                                   min((u32)frport->fcoe_len,
2495                                       fcoe_ctlr_fcoe_size(fip)));
2496                 fcoe_ctlr_vn_add(fip, new);
2497                 break;
2498         default:
2499                 break;
2500         }
2501 }
2502
2503 /**
2504  * fcoe_ctlr_vn_claim_resp() - handle received Claim Response
2505  * @fip: The FCoE controller that received the frame
2506  * @new: newly-parsed remote port with frport from the Claim Response
2507  *
2508  * Called with ctlr_mutex held.
2509  */
2510 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
2511                                     struct fc_rport_priv *new)
2512 {
2513         LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
2514                         new->ids.port_id, fcoe_ctlr_state(fip->state));
2515         if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
2516                 fcoe_ctlr_vn_add(fip, new);
2517 }
2518
2519 /**
2520  * fcoe_ctlr_vn_beacon() - handle received beacon.
2521  * @fip: The FCoE controller that received the frame
2522  * @new: newly-parsed remote port with frport from the Beacon
2523  *
2524  * Called with ctlr_mutex held.
2525  */
2526 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
2527                                 struct fc_rport_priv *new)
2528 {
2529         struct fc_lport *lport = fip->lp;
2530         struct fc_rport_priv *rdata;
2531         struct fcoe_rport *frport;
2532
2533         frport = fcoe_ctlr_rport(new);
2534         if (frport->flags & FIP_FL_REC_OR_P2P) {
2535                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2536                 return;
2537         }
2538         mutex_lock(&lport->disc.disc_mutex);
2539         rdata = lport->tt.rport_lookup(lport, new->ids.port_id);
2540         if (rdata)
2541                 kref_get(&rdata->kref);
2542         mutex_unlock(&lport->disc.disc_mutex);
2543         if (rdata) {
2544                 if (rdata->ids.node_name == new->ids.node_name &&
2545                     rdata->ids.port_name == new->ids.port_name) {
2546                         frport = fcoe_ctlr_rport(rdata);
2547                         if (!frport->time && fip->state == FIP_ST_VNMP_UP)
2548                                 lport->tt.rport_login(rdata);
2549                         frport->time = jiffies;
2550                 }
2551                 kref_put(&rdata->kref, lport->tt.rport_destroy);
2552                 return;
2553         }
2554         if (fip->state != FIP_ST_VNMP_UP)
2555                 return;
2556
2557         /*
2558          * Beacon from a new neighbor.
2559          * Send a claim notify if one hasn't been sent recently.
2560          * Don't add the neighbor yet.
2561          */
2562         LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
2563                         new->ids.port_id);
2564         if (time_after(jiffies,
2565                        fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
2566                 fcoe_ctlr_vn_send_claim(fip);
2567 }
2568
2569 /**
2570  * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
2571  * @fip: The FCoE controller
2572  *
2573  * Called with ctlr_mutex held.
2574  * Called only in state FIP_ST_VNMP_UP.
2575  * Returns the soonest time for next age-out or a time far in the future.
2576  */
2577 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
2578 {
2579         struct fc_lport *lport = fip->lp;
2580         struct fc_rport_priv *rdata;
2581         struct fcoe_rport *frport;
2582         unsigned long next_time;
2583         unsigned long deadline;
2584
2585         next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
2586         mutex_lock(&lport->disc.disc_mutex);
2587         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
2588                 frport = fcoe_ctlr_rport(rdata);
2589                 if (!frport->time)
2590                         continue;
2591                 deadline = frport->time +
2592                            msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
2593                 if (time_after_eq(jiffies, deadline)) {
2594                         frport->time = 0;
2595                         LIBFCOE_FIP_DBG(fip,
2596                                 "port %16.16llx fc_id %6.6x beacon expired\n",
2597                                 rdata->ids.port_name, rdata->ids.port_id);
2598                         lport->tt.rport_logoff(rdata);
2599                 } else if (time_before(deadline, next_time))
2600                         next_time = deadline;
2601         }
2602         mutex_unlock(&lport->disc.disc_mutex);
2603         return next_time;
2604 }
2605
2606 /**
2607  * fcoe_ctlr_vn_recv() - Receive a FIP frame
2608  * @fip: The FCoE controller that received the frame
2609  * @skb: The received FIP frame
2610  *
2611  * Returns non-zero if the frame is dropped.
2612  * Always consumes the frame.
2613  */
2614 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2615 {
2616         struct fip_header *fiph;
2617         enum fip_vn2vn_subcode sub;
2618         struct {
2619                 struct fc_rport_priv rdata;
2620                 struct fcoe_rport frport;
2621         } buf;
2622         int rc;
2623
2624         fiph = (struct fip_header *)skb->data;
2625         sub = fiph->fip_subcode;
2626
2627         rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata);
2628         if (rc) {
2629                 LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
2630                 goto drop;
2631         }
2632
2633         mutex_lock(&fip->ctlr_mutex);
2634         switch (sub) {
2635         case FIP_SC_VN_PROBE_REQ:
2636                 fcoe_ctlr_vn_probe_req(fip, &buf.rdata);
2637                 break;
2638         case FIP_SC_VN_PROBE_REP:
2639                 fcoe_ctlr_vn_probe_reply(fip, &buf.rdata);
2640                 break;
2641         case FIP_SC_VN_CLAIM_NOTIFY:
2642                 fcoe_ctlr_vn_claim_notify(fip, &buf.rdata);
2643                 break;
2644         case FIP_SC_VN_CLAIM_REP:
2645                 fcoe_ctlr_vn_claim_resp(fip, &buf.rdata);
2646                 break;
2647         case FIP_SC_VN_BEACON:
2648                 fcoe_ctlr_vn_beacon(fip, &buf.rdata);
2649                 break;
2650         default:
2651                 LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
2652                 rc = -1;
2653                 break;
2654         }
2655         mutex_unlock(&fip->ctlr_mutex);
2656 drop:
2657         kfree_skb(skb);
2658         return rc;
2659 }
2660
2661 /**
2662  * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
2663  * @lport: The local port
2664  * @fp: The received frame
2665  *
2666  * This should never be called since we don't see RSCNs or other
2667  * fabric-generated ELSes.
2668  */
2669 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
2670 {
2671         struct fc_seq_els_data rjt_data;
2672
2673         rjt_data.reason = ELS_RJT_UNSUP;
2674         rjt_data.explan = ELS_EXPL_NONE;
2675         lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
2676         fc_frame_free(fp);
2677 }
2678
2679 /**
2680  * fcoe_ctlr_disc_recv - start discovery for VN2VN mode.
2681  * @fip: The FCoE controller
2682  *
2683  * This sets a flag indicating that remote ports should be created
2684  * and started for the peers we discover.  We use the disc_callback
2685  * pointer as that flag.  Peers already discovered are created here.
2686  *
2687  * The lport lock is held during this call. The callback must be done
2688  * later, without holding either the lport or discovery locks.
2689  * The fcoe_ctlr lock may also be held during this call.
2690  */
2691 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
2692                                                   enum fc_disc_event),
2693                                  struct fc_lport *lport)
2694 {
2695         struct fc_disc *disc = &lport->disc;
2696         struct fcoe_ctlr *fip = disc->priv;
2697
2698         mutex_lock(&disc->disc_mutex);
2699         disc->disc_callback = callback;
2700         disc->disc_id = (disc->disc_id + 2) | 1;
2701         disc->pending = 1;
2702         schedule_work(&fip->timer_work);
2703         mutex_unlock(&disc->disc_mutex);
2704 }
2705
2706 /**
2707  * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
2708  * @fip: The FCoE controller
2709  *
2710  * Starts the FLOGI and PLOGI login process to each discovered rport for which
2711  * we've received at least one beacon.
2712  * Performs the discovery complete callback.
2713  */
2714 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
2715 {
2716         struct fc_lport *lport = fip->lp;
2717         struct fc_disc *disc = &lport->disc;
2718         struct fc_rport_priv *rdata;
2719         struct fcoe_rport *frport;
2720         void (*callback)(struct fc_lport *, enum fc_disc_event);
2721
2722         mutex_lock(&disc->disc_mutex);
2723         callback = disc->pending ? disc->disc_callback : NULL;
2724         disc->pending = 0;
2725         list_for_each_entry_rcu(rdata, &disc->rports, peers) {
2726                 frport = fcoe_ctlr_rport(rdata);
2727                 if (frport->time)
2728                         lport->tt.rport_login(rdata);
2729         }
2730         mutex_unlock(&disc->disc_mutex);
2731         if (callback)
2732                 callback(lport, DISC_EV_SUCCESS);
2733 }
2734
2735 /**
2736  * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
2737  * @fip: The FCoE controller
2738  */
2739 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
2740 {
2741         unsigned long next_time;
2742         u8 mac[ETH_ALEN];
2743         u32 new_port_id = 0;
2744
2745         mutex_lock(&fip->ctlr_mutex);
2746         switch (fip->state) {
2747         case FIP_ST_VNMP_START:
2748                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
2749                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2750                 next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
2751                 break;
2752         case FIP_ST_VNMP_PROBE1:
2753                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
2754                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2755                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2756                 break;
2757         case FIP_ST_VNMP_PROBE2:
2758                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
2759                 new_port_id = fip->port_id;
2760                 hton24(mac, FIP_VN_FC_MAP);
2761                 hton24(mac + 3, new_port_id);
2762                 fcoe_ctlr_map_dest(fip);
2763                 fip->update_mac(fip->lp, mac);
2764                 fcoe_ctlr_vn_send_claim(fip);
2765                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2766                 break;
2767         case FIP_ST_VNMP_CLAIM:
2768                 /*
2769                  * This may be invoked either by starting discovery so don't
2770                  * go to the next state unless it's been long enough.
2771                  */
2772                 next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2773                 if (time_after_eq(jiffies, next_time)) {
2774                         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
2775                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2776                                           fcoe_all_vn2vn, 0);
2777                         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2778                         fip->port_ka_time = next_time;
2779                 }
2780                 fcoe_ctlr_vn_disc(fip);
2781                 break;
2782         case FIP_ST_VNMP_UP:
2783                 next_time = fcoe_ctlr_vn_age(fip);
2784                 if (time_after_eq(jiffies, fip->port_ka_time)) {
2785                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2786                                           fcoe_all_vn2vn, 0);
2787                         fip->port_ka_time = jiffies +
2788                                  msecs_to_jiffies(FIP_VN_BEACON_INT +
2789                                         (random32() % FIP_VN_BEACON_FUZZ));
2790                 }
2791                 if (time_before(fip->port_ka_time, next_time))
2792                         next_time = fip->port_ka_time;
2793                 break;
2794         case FIP_ST_LINK_WAIT:
2795                 goto unlock;
2796         default:
2797                 WARN(1, "unexpected state %d\n", fip->state);
2798                 goto unlock;
2799         }
2800         mod_timer(&fip->timer, next_time);
2801 unlock:
2802         mutex_unlock(&fip->ctlr_mutex);
2803
2804         /* If port ID is new, notify local port after dropping ctlr_mutex */
2805         if (new_port_id)
2806                 fc_lport_set_local_id(fip->lp, new_port_id);
2807 }
2808
2809 /**
2810  * fcoe_libfc_config() - Sets up libfc related properties for local port
2811  * @lport:    The local port to configure libfc for
2812  * @fip:      The FCoE controller in use by the local port
2813  * @tt:       The libfc function template
2814  * @init_fcp: If non-zero, the FCP portion of libfc should be initialized
2815  *
2816  * Returns : 0 for success
2817  */
2818 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
2819                       const struct libfc_function_template *tt, int init_fcp)
2820 {
2821         /* Set the function pointers set by the LLDD */
2822         memcpy(&lport->tt, tt, sizeof(*tt));
2823         if (init_fcp && fc_fcp_init(lport))
2824                 return -ENOMEM;
2825         fc_exch_init(lport);
2826         fc_elsct_init(lport);
2827         fc_lport_init(lport);
2828         if (fip->mode == FIP_MODE_VN2VN)
2829                 lport->rport_priv_size = sizeof(struct fcoe_rport);
2830         fc_rport_init(lport);
2831         if (fip->mode == FIP_MODE_VN2VN) {
2832                 lport->point_to_multipoint = 1;
2833                 lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
2834                 lport->tt.disc_start = fcoe_ctlr_disc_start;
2835                 lport->tt.disc_stop = fcoe_ctlr_disc_stop;
2836                 lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
2837                 mutex_init(&lport->disc.disc_mutex);
2838                 INIT_LIST_HEAD(&lport->disc.rports);
2839                 lport->disc.priv = fip;
2840         } else {
2841                 fc_disc_init(lport);
2842         }
2843         return 0;
2844 }
2845 EXPORT_SYMBOL_GPL(fcoe_libfc_config);
2846
2847 void fcoe_fcf_get_selected(struct fcoe_fcf_device *fcf_dev)
2848 {
2849         struct fcoe_ctlr_device *ctlr_dev = fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2850         struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
2851         struct fcoe_fcf *fcf;
2852
2853         mutex_lock(&fip->ctlr_mutex);
2854         mutex_lock(&ctlr_dev->lock);
2855
2856         fcf = fcoe_fcf_device_priv(fcf_dev);
2857         if (fcf)
2858                 fcf_dev->selected = (fcf == fip->sel_fcf) ? 1 : 0;
2859         else
2860                 fcf_dev->selected = 0;
2861
2862         mutex_unlock(&ctlr_dev->lock);
2863         mutex_unlock(&fip->ctlr_mutex);
2864 }
2865 EXPORT_SYMBOL(fcoe_fcf_get_selected);
2866
2867 void fcoe_ctlr_get_fip_mode(struct fcoe_ctlr_device *ctlr_dev)
2868 {
2869         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2870
2871         mutex_lock(&ctlr->ctlr_mutex);
2872         switch (ctlr->mode) {
2873         case FIP_MODE_FABRIC:
2874                 ctlr_dev->mode = FIP_CONN_TYPE_FABRIC;
2875                 break;
2876         case FIP_MODE_VN2VN:
2877                 ctlr_dev->mode = FIP_CONN_TYPE_VN2VN;
2878                 break;
2879         default:
2880                 ctlr_dev->mode = FIP_CONN_TYPE_UNKNOWN;
2881                 break;
2882         }
2883         mutex_unlock(&ctlr->ctlr_mutex);
2884 }
2885 EXPORT_SYMBOL(fcoe_ctlr_get_fip_mode);