[SCSI] Merge tag 'fcoe-02-19-13' into for-linus
[~shefty/rdma-dev.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                 /*
1296                  * We are yet to select best FCF, but we got CVL in the
1297                  * meantime. reset the ctlr and let it rediscover the FCF
1298                  */
1299                 mutex_lock(&fip->ctlr_mutex);
1300                 fcoe_ctlr_reset(fip);
1301                 mutex_unlock(&fip->ctlr_mutex);
1302                 return;
1303         }
1304
1305         /*
1306          * mask of required descriptors.  Validating each one clears its bit.
1307          */
1308         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
1309
1310         rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
1311         desc = (struct fip_desc *)(fh + 1);
1312
1313         /*
1314          * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
1315          * before determining max Vx_Port descriptor but a buggy FCF could have
1316          * omited either or both MAC Address and Name Identifier descriptors
1317          */
1318         num_vlink_desc = rlen / sizeof(*vp);
1319         if (num_vlink_desc)
1320                 vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc,
1321                                          GFP_ATOMIC);
1322         if (!vlink_desc_arr)
1323                 return;
1324         num_vlink_desc = 0;
1325
1326         while (rlen >= sizeof(*desc)) {
1327                 dlen = desc->fip_dlen * FIP_BPW;
1328                 if (dlen > rlen)
1329                         goto err;
1330                 /* Drop CVL if there are duplicate critical descriptors */
1331                 if ((desc->fip_dtype < 32) &&
1332                     (desc->fip_dtype != FIP_DT_VN_ID) &&
1333                     !(desc_mask & 1U << desc->fip_dtype)) {
1334                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1335                                         "Descriptors in FIP CVL\n");
1336                         goto err;
1337                 }
1338                 switch (desc->fip_dtype) {
1339                 case FIP_DT_MAC:
1340                         mp = (struct fip_mac_desc *)desc;
1341                         if (dlen < sizeof(*mp))
1342                                 goto err;
1343                         if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
1344                                 goto err;
1345                         desc_mask &= ~BIT(FIP_DT_MAC);
1346                         break;
1347                 case FIP_DT_NAME:
1348                         wp = (struct fip_wwn_desc *)desc;
1349                         if (dlen < sizeof(*wp))
1350                                 goto err;
1351                         if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
1352                                 goto err;
1353                         desc_mask &= ~BIT(FIP_DT_NAME);
1354                         break;
1355                 case FIP_DT_VN_ID:
1356                         vp = (struct fip_vn_desc *)desc;
1357                         if (dlen < sizeof(*vp))
1358                                 goto err;
1359                         vlink_desc_arr[num_vlink_desc++] = vp;
1360                         vn_port = fc_vport_id_lookup(lport,
1361                                                       ntoh24(vp->fd_fc_id));
1362                         if (vn_port && (vn_port == lport)) {
1363                                 mutex_lock(&fip->ctlr_mutex);
1364                                 per_cpu_ptr(lport->stats,
1365                                             get_cpu())->VLinkFailureCount++;
1366                                 put_cpu();
1367                                 fcoe_ctlr_reset(fip);
1368                                 mutex_unlock(&fip->ctlr_mutex);
1369                         }
1370                         break;
1371                 default:
1372                         /* standard says ignore unknown descriptors >= 128 */
1373                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1374                                 goto err;
1375                         break;
1376                 }
1377                 desc = (struct fip_desc *)((char *)desc + dlen);
1378                 rlen -= dlen;
1379         }
1380
1381         /*
1382          * reset only if all required descriptors were present and valid.
1383          */
1384         if (desc_mask)
1385                 LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
1386                                 desc_mask);
1387         else if (!num_vlink_desc) {
1388                 LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
1389                 /*
1390                  * No Vx_Port description. Clear all NPIV ports,
1391                  * followed by physical port
1392                  */
1393                 mutex_lock(&fip->ctlr_mutex);
1394                 per_cpu_ptr(lport->stats, get_cpu())->VLinkFailureCount++;
1395                 put_cpu();
1396                 fcoe_ctlr_reset(fip);
1397                 mutex_unlock(&fip->ctlr_mutex);
1398
1399                 mutex_lock(&lport->lp_mutex);
1400                 list_for_each_entry(vn_port, &lport->vports, list)
1401                         fc_lport_reset(vn_port);
1402                 mutex_unlock(&lport->lp_mutex);
1403
1404                 fc_lport_reset(fip->lp);
1405                 fcoe_ctlr_solicit(fip, NULL);
1406         } else {
1407                 int i;
1408
1409                 LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
1410                 for (i = 0; i < num_vlink_desc; i++) {
1411                         vp = vlink_desc_arr[i];
1412                         vn_port = fc_vport_id_lookup(lport,
1413                                                      ntoh24(vp->fd_fc_id));
1414                         if (!vn_port)
1415                                 continue;
1416
1417                         /*
1418                          * 'port_id' is already validated, check MAC address and
1419                          * wwpn
1420                          */
1421                         if (compare_ether_addr(fip->get_src_addr(vn_port),
1422                                                 vp->fd_mac) != 0 ||
1423                                 get_unaligned_be64(&vp->fd_wwpn) !=
1424                                                         vn_port->wwpn)
1425                                 continue;
1426
1427                         if (vn_port == lport)
1428                                 /*
1429                                  * Physical port, defer processing till all
1430                                  * listed NPIV ports are cleared
1431                                  */
1432                                 reset_phys_port = 1;
1433                         else    /* NPIV port */
1434                                 fc_lport_reset(vn_port);
1435                 }
1436
1437                 if (reset_phys_port) {
1438                         fc_lport_reset(fip->lp);
1439                         fcoe_ctlr_solicit(fip, NULL);
1440                 }
1441         }
1442
1443 err:
1444         kfree(vlink_desc_arr);
1445 }
1446
1447 /**
1448  * fcoe_ctlr_recv() - Receive a FIP packet
1449  * @fip: The FCoE controller that received the packet
1450  * @skb: The received FIP packet
1451  *
1452  * This may be called from either NET_RX_SOFTIRQ or IRQ.
1453  */
1454 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1455 {
1456         skb_queue_tail(&fip->fip_recv_list, skb);
1457         schedule_work(&fip->recv_work);
1458 }
1459 EXPORT_SYMBOL(fcoe_ctlr_recv);
1460
1461 /**
1462  * fcoe_ctlr_recv_handler() - Receive a FIP frame
1463  * @fip: The FCoE controller that received the frame
1464  * @skb: The received FIP frame
1465  *
1466  * Returns non-zero if the frame is dropped.
1467  */
1468 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
1469 {
1470         struct fip_header *fiph;
1471         struct ethhdr *eh;
1472         enum fip_state state;
1473         u16 op;
1474         u8 sub;
1475
1476         if (skb_linearize(skb))
1477                 goto drop;
1478         if (skb->len < sizeof(*fiph))
1479                 goto drop;
1480         eh = eth_hdr(skb);
1481         if (fip->mode == FIP_MODE_VN2VN) {
1482                 if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1483                     compare_ether_addr(eh->h_dest, fcoe_all_vn2vn) &&
1484                     compare_ether_addr(eh->h_dest, fcoe_all_p2p))
1485                         goto drop;
1486         } else if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1487                    compare_ether_addr(eh->h_dest, fcoe_all_enode))
1488                 goto drop;
1489         fiph = (struct fip_header *)skb->data;
1490         op = ntohs(fiph->fip_op);
1491         sub = fiph->fip_subcode;
1492
1493         if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
1494                 goto drop;
1495         if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
1496                 goto drop;
1497
1498         mutex_lock(&fip->ctlr_mutex);
1499         state = fip->state;
1500         if (state == FIP_ST_AUTO) {
1501                 fip->map_dest = 0;
1502                 fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
1503                 state = FIP_ST_ENABLED;
1504                 LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
1505         }
1506         mutex_unlock(&fip->ctlr_mutex);
1507
1508         if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
1509                 return fcoe_ctlr_vn_recv(fip, skb);
1510
1511         if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
1512             state != FIP_ST_VNMP_CLAIM)
1513                 goto drop;
1514
1515         if (op == FIP_OP_LS) {
1516                 fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
1517                 return 0;
1518         }
1519
1520         if (state != FIP_ST_ENABLED)
1521                 goto drop;
1522
1523         if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
1524                 fcoe_ctlr_recv_adv(fip, skb);
1525         else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
1526                 fcoe_ctlr_recv_clr_vlink(fip, fiph);
1527         kfree_skb(skb);
1528         return 0;
1529 drop:
1530         kfree_skb(skb);
1531         return -1;
1532 }
1533
1534 /**
1535  * fcoe_ctlr_select() - Select the best FCF (if possible)
1536  * @fip: The FCoE controller
1537  *
1538  * Returns the selected FCF, or NULL if none are usable.
1539  *
1540  * If there are conflicting advertisements, no FCF can be chosen.
1541  *
1542  * If there is already a selected FCF, this will choose a better one or
1543  * an equivalent one that hasn't already been sent a FLOGI.
1544  *
1545  * Called with lock held.
1546  */
1547 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
1548 {
1549         struct fcoe_fcf *fcf;
1550         struct fcoe_fcf *best = fip->sel_fcf;
1551         struct fcoe_fcf *first;
1552
1553         first = list_first_entry(&fip->fcfs, struct fcoe_fcf, list);
1554
1555         list_for_each_entry(fcf, &fip->fcfs, list) {
1556                 LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
1557                                 "VFID %d mac %pM map %x val %d "
1558                                 "sent %u pri %u\n",
1559                                 fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
1560                                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
1561                                 fcf->flogi_sent, fcf->pri);
1562                 if (!fcoe_ctlr_fcf_usable(fcf)) {
1563                         LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
1564                                         "map %x %svalid %savailable\n",
1565                                         fcf->fabric_name, fcf->fc_map,
1566                                         (fcf->flags & FIP_FL_SOL) ? "" : "in",
1567                                         (fcf->flags & FIP_FL_AVAIL) ?
1568                                         "" : "un");
1569                         continue;
1570                 }
1571                 if (fcf->fabric_name != first->fabric_name ||
1572                     fcf->vfid != first->vfid ||
1573                     fcf->fc_map != first->fc_map) {
1574                         LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
1575                                         "or FC-MAP\n");
1576                         return NULL;
1577                 }
1578                 if (fcf->flogi_sent)
1579                         continue;
1580                 if (!best || fcf->pri < best->pri || best->flogi_sent)
1581                         best = fcf;
1582         }
1583         fip->sel_fcf = best;
1584         if (best) {
1585                 LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
1586                 fip->port_ka_time = jiffies +
1587                         msecs_to_jiffies(FIP_VN_KA_PERIOD);
1588                 fip->ctlr_ka_time = jiffies + best->fka_period;
1589                 if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1590                         mod_timer(&fip->timer, fip->ctlr_ka_time);
1591         }
1592         return best;
1593 }
1594
1595 /**
1596  * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
1597  * @fip: The FCoE controller
1598  *
1599  * Returns non-zero error if it could not be sent.
1600  *
1601  * Called with ctlr_mutex and ctlr_lock held.
1602  * Caller must verify that fip->sel_fcf is not NULL.
1603  */
1604 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
1605 {
1606         struct sk_buff *skb;
1607         struct sk_buff *skb_orig;
1608         struct fc_frame_header *fh;
1609         int error;
1610
1611         skb_orig = fip->flogi_req;
1612         if (!skb_orig)
1613                 return -EINVAL;
1614
1615         /*
1616          * Clone and send the FLOGI request.  If clone fails, use original.
1617          */
1618         skb = skb_clone(skb_orig, GFP_ATOMIC);
1619         if (!skb) {
1620                 skb = skb_orig;
1621                 fip->flogi_req = NULL;
1622         }
1623         fh = (struct fc_frame_header *)skb->data;
1624         error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
1625                                  ntoh24(fh->fh_d_id));
1626         if (error) {
1627                 kfree_skb(skb);
1628                 return error;
1629         }
1630         fip->send(fip, skb);
1631         fip->sel_fcf->flogi_sent = 1;
1632         return 0;
1633 }
1634
1635 /**
1636  * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
1637  * @fip: The FCoE controller
1638  *
1639  * Returns non-zero error code if there's no FLOGI request to retry or
1640  * no alternate FCF available.
1641  */
1642 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
1643 {
1644         struct fcoe_fcf *fcf;
1645         int error;
1646
1647         mutex_lock(&fip->ctlr_mutex);
1648         spin_lock_bh(&fip->ctlr_lock);
1649         LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
1650         fcf = fcoe_ctlr_select(fip);
1651         if (!fcf || fcf->flogi_sent) {
1652                 kfree_skb(fip->flogi_req);
1653                 fip->flogi_req = NULL;
1654                 error = -ENOENT;
1655         } else {
1656                 fcoe_ctlr_solicit(fip, NULL);
1657                 error = fcoe_ctlr_flogi_send_locked(fip);
1658         }
1659         spin_unlock_bh(&fip->ctlr_lock);
1660         mutex_unlock(&fip->ctlr_mutex);
1661         return error;
1662 }
1663
1664
1665 /**
1666  * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
1667  * @fip: The FCoE controller that timed out
1668  *
1669  * Done here because fcoe_ctlr_els_send() can't get mutex.
1670  *
1671  * Called with ctlr_mutex held.  The caller must not hold ctlr_lock.
1672  */
1673 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
1674 {
1675         struct fcoe_fcf *fcf;
1676
1677         spin_lock_bh(&fip->ctlr_lock);
1678         fcf = fip->sel_fcf;
1679         if (!fcf || !fip->flogi_req_send)
1680                 goto unlock;
1681
1682         LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
1683
1684         /*
1685          * If this FLOGI is being sent due to a timeout retry
1686          * to the same FCF as before, select a different FCF if possible.
1687          */
1688         if (fcf->flogi_sent) {
1689                 LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
1690                 fcf = fcoe_ctlr_select(fip);
1691                 if (!fcf || fcf->flogi_sent) {
1692                         LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
1693                         list_for_each_entry(fcf, &fip->fcfs, list)
1694                                 fcf->flogi_sent = 0;
1695                         fcf = fcoe_ctlr_select(fip);
1696                 }
1697         }
1698         if (fcf) {
1699                 fcoe_ctlr_flogi_send_locked(fip);
1700                 fip->flogi_req_send = 0;
1701         } else /* XXX */
1702                 LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
1703 unlock:
1704         spin_unlock_bh(&fip->ctlr_lock);
1705 }
1706
1707 /**
1708  * fcoe_ctlr_timeout() - FIP timeout handler
1709  * @arg: The FCoE controller that timed out
1710  */
1711 static void fcoe_ctlr_timeout(unsigned long arg)
1712 {
1713         struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
1714
1715         schedule_work(&fip->timer_work);
1716 }
1717
1718 /**
1719  * fcoe_ctlr_timer_work() - Worker thread function for timer work
1720  * @work: Handle to a FCoE controller
1721  *
1722  * Ages FCFs.  Triggers FCF selection if possible.
1723  * Sends keep-alives and resets.
1724  */
1725 static void fcoe_ctlr_timer_work(struct work_struct *work)
1726 {
1727         struct fcoe_ctlr *fip;
1728         struct fc_lport *vport;
1729         u8 *mac;
1730         u8 reset = 0;
1731         u8 send_ctlr_ka = 0;
1732         u8 send_port_ka = 0;
1733         struct fcoe_fcf *sel;
1734         struct fcoe_fcf *fcf;
1735         unsigned long next_timer;
1736
1737         fip = container_of(work, struct fcoe_ctlr, timer_work);
1738         if (fip->mode == FIP_MODE_VN2VN)
1739                 return fcoe_ctlr_vn_timeout(fip);
1740         mutex_lock(&fip->ctlr_mutex);
1741         if (fip->state == FIP_ST_DISABLED) {
1742                 mutex_unlock(&fip->ctlr_mutex);
1743                 return;
1744         }
1745
1746         fcf = fip->sel_fcf;
1747         next_timer = fcoe_ctlr_age_fcfs(fip);
1748
1749         sel = fip->sel_fcf;
1750         if (!sel && fip->sel_time) {
1751                 if (time_after_eq(jiffies, fip->sel_time)) {
1752                         sel = fcoe_ctlr_select(fip);
1753                         fip->sel_time = 0;
1754                 } else if (time_after(next_timer, fip->sel_time))
1755                         next_timer = fip->sel_time;
1756         }
1757
1758         if (sel && fip->flogi_req_send)
1759                 fcoe_ctlr_flogi_send(fip);
1760         else if (!sel && fcf)
1761                 reset = 1;
1762
1763         if (sel && !sel->fd_flags) {
1764                 if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
1765                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1766                         send_ctlr_ka = 1;
1767                 }
1768                 if (time_after(next_timer, fip->ctlr_ka_time))
1769                         next_timer = fip->ctlr_ka_time;
1770
1771                 if (time_after_eq(jiffies, fip->port_ka_time)) {
1772                         fip->port_ka_time = jiffies +
1773                                 msecs_to_jiffies(FIP_VN_KA_PERIOD);
1774                         send_port_ka = 1;
1775                 }
1776                 if (time_after(next_timer, fip->port_ka_time))
1777                         next_timer = fip->port_ka_time;
1778         }
1779         if (!list_empty(&fip->fcfs))
1780                 mod_timer(&fip->timer, next_timer);
1781         mutex_unlock(&fip->ctlr_mutex);
1782
1783         if (reset) {
1784                 fc_lport_reset(fip->lp);
1785                 /* restart things with a solicitation */
1786                 fcoe_ctlr_solicit(fip, NULL);
1787         }
1788
1789         if (send_ctlr_ka)
1790                 fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
1791
1792         if (send_port_ka) {
1793                 mutex_lock(&fip->lp->lp_mutex);
1794                 mac = fip->get_src_addr(fip->lp);
1795                 fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
1796                 list_for_each_entry(vport, &fip->lp->vports, list) {
1797                         mac = fip->get_src_addr(vport);
1798                         fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
1799                 }
1800                 mutex_unlock(&fip->lp->lp_mutex);
1801         }
1802 }
1803
1804 /**
1805  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
1806  * @recv_work: Handle to a FCoE controller
1807  */
1808 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
1809 {
1810         struct fcoe_ctlr *fip;
1811         struct sk_buff *skb;
1812
1813         fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1814         while ((skb = skb_dequeue(&fip->fip_recv_list)))
1815                 fcoe_ctlr_recv_handler(fip, skb);
1816 }
1817
1818 /**
1819  * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
1820  * @fip: The FCoE controller
1821  * @fp:  The FC frame to snoop
1822  *
1823  * Snoop potential response to FLOGI or even incoming FLOGI.
1824  *
1825  * The caller has checked that we are waiting for login as indicated
1826  * by fip->flogi_oxid != FC_XID_UNKNOWN.
1827  *
1828  * The caller is responsible for freeing the frame.
1829  * Fill in the granted_mac address.
1830  *
1831  * Return non-zero if the frame should not be delivered to libfc.
1832  */
1833 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
1834                          struct fc_frame *fp)
1835 {
1836         struct fc_frame_header *fh;
1837         u8 op;
1838         u8 *sa;
1839
1840         sa = eth_hdr(&fp->skb)->h_source;
1841         fh = fc_frame_header_get(fp);
1842         if (fh->fh_type != FC_TYPE_ELS)
1843                 return 0;
1844
1845         op = fc_frame_payload_op(fp);
1846         if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
1847             fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1848
1849                 mutex_lock(&fip->ctlr_mutex);
1850                 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
1851                         mutex_unlock(&fip->ctlr_mutex);
1852                         return -EINVAL;
1853                 }
1854                 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1855                 LIBFCOE_FIP_DBG(fip,
1856                                 "received FLOGI LS_ACC using non-FIP mode\n");
1857
1858                 /*
1859                  * FLOGI accepted.
1860                  * If the src mac addr is FC_OUI-based, then we mark the
1861                  * address_mode flag to use FC_OUI-based Ethernet DA.
1862                  * Otherwise we use the FCoE gateway addr
1863                  */
1864                 if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
1865                         fcoe_ctlr_map_dest(fip);
1866                 } else {
1867                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1868                         fip->map_dest = 0;
1869                 }
1870                 fip->flogi_oxid = FC_XID_UNKNOWN;
1871                 mutex_unlock(&fip->ctlr_mutex);
1872                 fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
1873         } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
1874                 /*
1875                  * Save source MAC for point-to-point responses.
1876                  */
1877                 mutex_lock(&fip->ctlr_mutex);
1878                 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
1879                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1880                         fip->map_dest = 0;
1881                         if (fip->state == FIP_ST_AUTO)
1882                                 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
1883                                                 "Setting non-FIP mode\n");
1884                         fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1885                 }
1886                 mutex_unlock(&fip->ctlr_mutex);
1887         }
1888         return 0;
1889 }
1890 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
1891
1892 /**
1893  * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
1894  * @mac:    The MAC address to convert
1895  * @scheme: The scheme to use when converting
1896  * @port:   The port indicator for converting
1897  *
1898  * Returns: u64 fc world wide name
1899  */
1900 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1901                       unsigned int scheme, unsigned int port)
1902 {
1903         u64 wwn;
1904         u64 host_mac;
1905
1906         /* The MAC is in NO, so flip only the low 48 bits */
1907         host_mac = ((u64) mac[0] << 40) |
1908                 ((u64) mac[1] << 32) |
1909                 ((u64) mac[2] << 24) |
1910                 ((u64) mac[3] << 16) |
1911                 ((u64) mac[4] << 8) |
1912                 (u64) mac[5];
1913
1914         WARN_ON(host_mac >= (1ULL << 48));
1915         wwn = host_mac | ((u64) scheme << 60);
1916         switch (scheme) {
1917         case 1:
1918                 WARN_ON(port != 0);
1919                 break;
1920         case 2:
1921                 WARN_ON(port >= 0xfff);
1922                 wwn |= (u64) port << 48;
1923                 break;
1924         default:
1925                 WARN_ON(1);
1926                 break;
1927         }
1928
1929         return wwn;
1930 }
1931 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1932
1933 /**
1934  * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
1935  * @rdata: libfc remote port
1936  */
1937 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
1938 {
1939         return (struct fcoe_rport *)(rdata + 1);
1940 }
1941
1942 /**
1943  * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
1944  * @fip: The FCoE controller
1945  * @sub: sub-opcode for probe request, reply, or advertisement.
1946  * @dest: The destination Ethernet MAC address
1947  * @min_len: minimum size of the Ethernet payload to be sent
1948  */
1949 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
1950                               enum fip_vn2vn_subcode sub,
1951                               const u8 *dest, size_t min_len)
1952 {
1953         struct sk_buff *skb;
1954         struct fip_frame {
1955                 struct ethhdr eth;
1956                 struct fip_header fip;
1957                 struct fip_mac_desc mac;
1958                 struct fip_wwn_desc wwnn;
1959                 struct fip_vn_desc vn;
1960         } __packed * frame;
1961         struct fip_fc4_feat *ff;
1962         struct fip_size_desc *size;
1963         u32 fcp_feat;
1964         size_t len;
1965         size_t dlen;
1966
1967         len = sizeof(*frame);
1968         dlen = 0;
1969         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
1970                 dlen = sizeof(struct fip_fc4_feat) +
1971                        sizeof(struct fip_size_desc);
1972                 len += dlen;
1973         }
1974         dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
1975         len = max(len, min_len + sizeof(struct ethhdr));
1976
1977         skb = dev_alloc_skb(len);
1978         if (!skb)
1979                 return;
1980
1981         frame = (struct fip_frame *)skb->data;
1982         memset(frame, 0, len);
1983         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
1984
1985         if (sub == FIP_SC_VN_BEACON) {
1986                 hton24(frame->eth.h_source, FIP_VN_FC_MAP);
1987                 hton24(frame->eth.h_source + 3, fip->port_id);
1988         } else {
1989                 memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
1990         }
1991         frame->eth.h_proto = htons(ETH_P_FIP);
1992
1993         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
1994         frame->fip.fip_op = htons(FIP_OP_VN2VN);
1995         frame->fip.fip_subcode = sub;
1996         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
1997
1998         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
1999         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
2000         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
2001
2002         frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
2003         frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
2004         put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
2005
2006         frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
2007         frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
2008         hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
2009         hton24(frame->vn.fd_mac + 3, fip->port_id);
2010         hton24(frame->vn.fd_fc_id, fip->port_id);
2011         put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
2012
2013         /*
2014          * For claims, add FC-4 features.
2015          * TBD: Add interface to get fc-4 types and features from libfc.
2016          */
2017         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
2018                 ff = (struct fip_fc4_feat *)(frame + 1);
2019                 ff->fd_desc.fip_dtype = FIP_DT_FC4F;
2020                 ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
2021                 ff->fd_fts = fip->lp->fcts;
2022
2023                 fcp_feat = 0;
2024                 if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
2025                         fcp_feat |= FCP_FEAT_INIT;
2026                 if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
2027                         fcp_feat |= FCP_FEAT_TARG;
2028                 fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
2029                 ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
2030
2031                 size = (struct fip_size_desc *)(ff + 1);
2032                 size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
2033                 size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
2034                 size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
2035         }
2036
2037         skb_put(skb, len);
2038         skb->protocol = htons(ETH_P_FIP);
2039         skb->priority = fip->priority;
2040         skb_reset_mac_header(skb);
2041         skb_reset_network_header(skb);
2042
2043         fip->send(fip, skb);
2044 }
2045
2046 /**
2047  * fcoe_ctlr_vn_rport_callback - Event handler for rport events.
2048  * @lport: The lport which is receiving the event
2049  * @rdata: remote port private data
2050  * @event: The event that occurred
2051  *
2052  * Locking Note:  The rport lock must not be held when calling this function.
2053  */
2054 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
2055                                         struct fc_rport_priv *rdata,
2056                                         enum fc_rport_event event)
2057 {
2058         struct fcoe_ctlr *fip = lport->disc.priv;
2059         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2060
2061         LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
2062                         rdata->ids.port_id, event);
2063
2064         mutex_lock(&fip->ctlr_mutex);
2065         switch (event) {
2066         case RPORT_EV_READY:
2067                 frport->login_count = 0;
2068                 break;
2069         case RPORT_EV_LOGO:
2070         case RPORT_EV_FAILED:
2071         case RPORT_EV_STOP:
2072                 frport->login_count++;
2073                 if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
2074                         LIBFCOE_FIP_DBG(fip,
2075                                         "rport FLOGI limited port_id %6.6x\n",
2076                                         rdata->ids.port_id);
2077                         lport->tt.rport_logoff(rdata);
2078                 }
2079                 break;
2080         default:
2081                 break;
2082         }
2083         mutex_unlock(&fip->ctlr_mutex);
2084 }
2085
2086 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
2087         .event_callback = fcoe_ctlr_vn_rport_callback,
2088 };
2089
2090 /**
2091  * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
2092  * @fip: The FCoE controller
2093  *
2094  * Called with ctlr_mutex held.
2095  */
2096 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
2097 {
2098         mutex_lock(&lport->disc.disc_mutex);
2099         lport->disc.disc_callback = NULL;
2100         mutex_unlock(&lport->disc.disc_mutex);
2101 }
2102
2103 /**
2104  * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
2105  * @fip: The FCoE controller
2106  *
2107  * Called through the local port template for discovery.
2108  * Called without the ctlr_mutex held.
2109  */
2110 static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
2111 {
2112         struct fcoe_ctlr *fip = lport->disc.priv;
2113
2114         mutex_lock(&fip->ctlr_mutex);
2115         fcoe_ctlr_disc_stop_locked(lport);
2116         mutex_unlock(&fip->ctlr_mutex);
2117 }
2118
2119 /**
2120  * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
2121  * @fip: The FCoE controller
2122  *
2123  * Called through the local port template for discovery.
2124  * Called without the ctlr_mutex held.
2125  */
2126 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
2127 {
2128         fcoe_ctlr_disc_stop(lport);
2129         lport->tt.rport_flush_queue();
2130         synchronize_rcu();
2131 }
2132
2133 /**
2134  * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
2135  * @fip: The FCoE controller
2136  *
2137  * Called with fcoe_ctlr lock held.
2138  */
2139 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
2140 {
2141         unsigned long wait;
2142         u32 port_id;
2143
2144         fcoe_ctlr_disc_stop_locked(fip->lp);
2145
2146         /*
2147          * Get proposed port ID.
2148          * If this is the first try after link up, use any previous port_id.
2149          * If there was none, use the low bits of the port_name.
2150          * On subsequent tries, get the next random one.
2151          * Don't use reserved IDs, use another non-zero value, just as random.
2152          */
2153         port_id = fip->port_id;
2154         if (fip->probe_tries)
2155                 port_id = prandom_u32_state(&fip->rnd_state) & 0xffff;
2156         else if (!port_id)
2157                 port_id = fip->lp->wwpn & 0xffff;
2158         if (!port_id || port_id == 0xffff)
2159                 port_id = 1;
2160         fip->port_id = port_id;
2161
2162         if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
2163                 fip->probe_tries++;
2164                 wait = random32() % FIP_VN_PROBE_WAIT;
2165         } else
2166                 wait = FIP_VN_RLIM_INT;
2167         mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
2168         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
2169 }
2170
2171 /**
2172  * fcoe_ctlr_vn_start() - Start in VN2VN mode
2173  * @fip: The FCoE controller
2174  *
2175  * Called with fcoe_ctlr lock held.
2176  */
2177 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
2178 {
2179         fip->probe_tries = 0;
2180         prandom_seed_state(&fip->rnd_state, fip->lp->wwpn);
2181         fcoe_ctlr_vn_restart(fip);
2182 }
2183
2184 /**
2185  * fcoe_ctlr_vn_parse - parse probe request or response
2186  * @fip: The FCoE controller
2187  * @skb: incoming packet
2188  * @rdata: buffer for resulting parsed VN entry plus fcoe_rport
2189  *
2190  * Returns non-zero error number on error.
2191  * Does not consume the packet.
2192  */
2193 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
2194                               struct sk_buff *skb,
2195                               struct fc_rport_priv *rdata)
2196 {
2197         struct fip_header *fiph;
2198         struct fip_desc *desc = NULL;
2199         struct fip_mac_desc *macd = NULL;
2200         struct fip_wwn_desc *wwn = NULL;
2201         struct fip_vn_desc *vn = NULL;
2202         struct fip_size_desc *size = NULL;
2203         struct fcoe_rport *frport;
2204         size_t rlen;
2205         size_t dlen;
2206         u32 desc_mask = 0;
2207         u32 dtype;
2208         u8 sub;
2209
2210         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2211         frport = fcoe_ctlr_rport(rdata);
2212
2213         fiph = (struct fip_header *)skb->data;
2214         frport->flags = ntohs(fiph->fip_flags);
2215
2216         sub = fiph->fip_subcode;
2217         switch (sub) {
2218         case FIP_SC_VN_PROBE_REQ:
2219         case FIP_SC_VN_PROBE_REP:
2220         case FIP_SC_VN_BEACON:
2221                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2222                             BIT(FIP_DT_VN_ID);
2223                 break;
2224         case FIP_SC_VN_CLAIM_NOTIFY:
2225         case FIP_SC_VN_CLAIM_REP:
2226                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2227                             BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
2228                             BIT(FIP_DT_FCOE_SIZE);
2229                 break;
2230         default:
2231                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2232                 return -EINVAL;
2233         }
2234
2235         rlen = ntohs(fiph->fip_dl_len) * 4;
2236         if (rlen + sizeof(*fiph) > skb->len)
2237                 return -EINVAL;
2238
2239         desc = (struct fip_desc *)(fiph + 1);
2240         while (rlen > 0) {
2241                 dlen = desc->fip_dlen * FIP_BPW;
2242                 if (dlen < sizeof(*desc) || dlen > rlen)
2243                         return -EINVAL;
2244
2245                 dtype = desc->fip_dtype;
2246                 if (dtype < 32) {
2247                         if (!(desc_mask & BIT(dtype))) {
2248                                 LIBFCOE_FIP_DBG(fip,
2249                                                 "unexpected or duplicated desc "
2250                                                 "desc type %u in "
2251                                                 "FIP VN2VN subtype %u\n",
2252                                                 dtype, sub);
2253                                 return -EINVAL;
2254                         }
2255                         desc_mask &= ~BIT(dtype);
2256                 }
2257
2258                 switch (dtype) {
2259                 case FIP_DT_MAC:
2260                         if (dlen != sizeof(struct fip_mac_desc))
2261                                 goto len_err;
2262                         macd = (struct fip_mac_desc *)desc;
2263                         if (!is_valid_ether_addr(macd->fd_mac)) {
2264                                 LIBFCOE_FIP_DBG(fip,
2265                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2266                                          macd->fd_mac);
2267                                 return -EINVAL;
2268                         }
2269                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2270                         break;
2271                 case FIP_DT_NAME:
2272                         if (dlen != sizeof(struct fip_wwn_desc))
2273                                 goto len_err;
2274                         wwn = (struct fip_wwn_desc *)desc;
2275                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2276                         break;
2277                 case FIP_DT_VN_ID:
2278                         if (dlen != sizeof(struct fip_vn_desc))
2279                                 goto len_err;
2280                         vn = (struct fip_vn_desc *)desc;
2281                         memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
2282                         rdata->ids.port_id = ntoh24(vn->fd_fc_id);
2283                         rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn);
2284                         break;
2285                 case FIP_DT_FC4F:
2286                         if (dlen != sizeof(struct fip_fc4_feat))
2287                                 goto len_err;
2288                         break;
2289                 case FIP_DT_FCOE_SIZE:
2290                         if (dlen != sizeof(struct fip_size_desc))
2291                                 goto len_err;
2292                         size = (struct fip_size_desc *)desc;
2293                         frport->fcoe_len = ntohs(size->fd_size);
2294                         break;
2295                 default:
2296                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2297                                         "in FIP probe\n", dtype);
2298                         /* standard says ignore unknown descriptors >= 128 */
2299                         if (dtype < FIP_DT_VENDOR_BASE)
2300                                 return -EINVAL;
2301                         break;
2302                 }
2303                 desc = (struct fip_desc *)((char *)desc + dlen);
2304                 rlen -= dlen;
2305         }
2306         return 0;
2307
2308 len_err:
2309         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2310                         dtype, dlen);
2311         return -EINVAL;
2312 }
2313
2314 /**
2315  * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
2316  * @fip: The FCoE controller
2317  *
2318  * Called with ctlr_mutex held.
2319  */
2320 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
2321 {
2322         fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
2323         fip->sol_time = jiffies;
2324 }
2325
2326 /**
2327  * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
2328  * @fip: The FCoE controller
2329  * @rdata: parsed remote port with frport from the probe request
2330  *
2331  * Called with ctlr_mutex held.
2332  */
2333 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
2334                                    struct fc_rport_priv *rdata)
2335 {
2336         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2337
2338         if (rdata->ids.port_id != fip->port_id)
2339                 return;
2340
2341         switch (fip->state) {
2342         case FIP_ST_VNMP_CLAIM:
2343         case FIP_ST_VNMP_UP:
2344                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2345                                   frport->enode_mac, 0);
2346                 break;
2347         case FIP_ST_VNMP_PROBE1:
2348         case FIP_ST_VNMP_PROBE2:
2349                 /*
2350                  * Decide whether to reply to the Probe.
2351                  * Our selected address is never a "recorded" one, so
2352                  * only reply if our WWPN is greater and the
2353                  * Probe's REC bit is not set.
2354                  * If we don't reply, we will change our address.
2355                  */
2356                 if (fip->lp->wwpn > rdata->ids.port_name &&
2357                     !(frport->flags & FIP_FL_REC_OR_P2P)) {
2358                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2359                                           frport->enode_mac, 0);
2360                         break;
2361                 }
2362                 /* fall through */
2363         case FIP_ST_VNMP_START:
2364                 fcoe_ctlr_vn_restart(fip);
2365                 break;
2366         default:
2367                 break;
2368         }
2369 }
2370
2371 /**
2372  * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
2373  * @fip: The FCoE controller
2374  * @rdata: parsed remote port with frport from the probe request
2375  *
2376  * Called with ctlr_mutex held.
2377  */
2378 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
2379                                    struct fc_rport_priv *rdata)
2380 {
2381         if (rdata->ids.port_id != fip->port_id)
2382                 return;
2383         switch (fip->state) {
2384         case FIP_ST_VNMP_START:
2385         case FIP_ST_VNMP_PROBE1:
2386         case FIP_ST_VNMP_PROBE2:
2387         case FIP_ST_VNMP_CLAIM:
2388                 fcoe_ctlr_vn_restart(fip);
2389                 break;
2390         case FIP_ST_VNMP_UP:
2391                 fcoe_ctlr_vn_send_claim(fip);
2392                 break;
2393         default:
2394                 break;
2395         }
2396 }
2397
2398 /**
2399  * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
2400  * @fip: The FCoE controller
2401  * @new: newly-parsed remote port with frport as a template for new rdata
2402  *
2403  * Called with ctlr_mutex held.
2404  */
2405 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new)
2406 {
2407         struct fc_lport *lport = fip->lp;
2408         struct fc_rport_priv *rdata;
2409         struct fc_rport_identifiers *ids;
2410         struct fcoe_rport *frport;
2411         u32 port_id;
2412
2413         port_id = new->ids.port_id;
2414         if (port_id == fip->port_id)
2415                 return;
2416
2417         mutex_lock(&lport->disc.disc_mutex);
2418         rdata = lport->tt.rport_create(lport, port_id);
2419         if (!rdata) {
2420                 mutex_unlock(&lport->disc.disc_mutex);
2421                 return;
2422         }
2423
2424         rdata->ops = &fcoe_ctlr_vn_rport_ops;
2425         rdata->disc_id = lport->disc.disc_id;
2426
2427         ids = &rdata->ids;
2428         if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) ||
2429             (ids->node_name != -1 && ids->node_name != new->ids.node_name))
2430                 lport->tt.rport_logoff(rdata);
2431         ids->port_name = new->ids.port_name;
2432         ids->node_name = new->ids.node_name;
2433         mutex_unlock(&lport->disc.disc_mutex);
2434
2435         frport = fcoe_ctlr_rport(rdata);
2436         LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s\n",
2437                         port_id, frport->fcoe_len ? "old" : "new");
2438         *frport = *fcoe_ctlr_rport(new);
2439         frport->time = 0;
2440 }
2441
2442 /**
2443  * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
2444  * @fip: The FCoE controller
2445  * @port_id:  The port_id of the remote VN_node
2446  * @mac: buffer which will hold the VN_NODE destination MAC address, if found.
2447  *
2448  * Returns non-zero error if no remote port found.
2449  */
2450 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
2451 {
2452         struct fc_lport *lport = fip->lp;
2453         struct fc_rport_priv *rdata;
2454         struct fcoe_rport *frport;
2455         int ret = -1;
2456
2457         rcu_read_lock();
2458         rdata = lport->tt.rport_lookup(lport, port_id);
2459         if (rdata) {
2460                 frport = fcoe_ctlr_rport(rdata);
2461                 memcpy(mac, frport->enode_mac, ETH_ALEN);
2462                 ret = 0;
2463         }
2464         rcu_read_unlock();
2465         return ret;
2466 }
2467
2468 /**
2469  * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
2470  * @fip: The FCoE controller
2471  * @new: newly-parsed remote port with frport as a template for new rdata
2472  *
2473  * Called with ctlr_mutex held.
2474  */
2475 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
2476                                       struct fc_rport_priv *new)
2477 {
2478         struct fcoe_rport *frport = fcoe_ctlr_rport(new);
2479
2480         if (frport->flags & FIP_FL_REC_OR_P2P) {
2481                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2482                 return;
2483         }
2484         switch (fip->state) {
2485         case FIP_ST_VNMP_START:
2486         case FIP_ST_VNMP_PROBE1:
2487         case FIP_ST_VNMP_PROBE2:
2488                 if (new->ids.port_id == fip->port_id)
2489                         fcoe_ctlr_vn_restart(fip);
2490                 break;
2491         case FIP_ST_VNMP_CLAIM:
2492         case FIP_ST_VNMP_UP:
2493                 if (new->ids.port_id == fip->port_id) {
2494                         if (new->ids.port_name > fip->lp->wwpn) {
2495                                 fcoe_ctlr_vn_restart(fip);
2496                                 break;
2497                         }
2498                         fcoe_ctlr_vn_send_claim(fip);
2499                         break;
2500                 }
2501                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac,
2502                                   min((u32)frport->fcoe_len,
2503                                       fcoe_ctlr_fcoe_size(fip)));
2504                 fcoe_ctlr_vn_add(fip, new);
2505                 break;
2506         default:
2507                 break;
2508         }
2509 }
2510
2511 /**
2512  * fcoe_ctlr_vn_claim_resp() - handle received Claim Response
2513  * @fip: The FCoE controller that received the frame
2514  * @new: newly-parsed remote port with frport from the Claim Response
2515  *
2516  * Called with ctlr_mutex held.
2517  */
2518 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
2519                                     struct fc_rport_priv *new)
2520 {
2521         LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
2522                         new->ids.port_id, fcoe_ctlr_state(fip->state));
2523         if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
2524                 fcoe_ctlr_vn_add(fip, new);
2525 }
2526
2527 /**
2528  * fcoe_ctlr_vn_beacon() - handle received beacon.
2529  * @fip: The FCoE controller that received the frame
2530  * @new: newly-parsed remote port with frport from the Beacon
2531  *
2532  * Called with ctlr_mutex held.
2533  */
2534 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
2535                                 struct fc_rport_priv *new)
2536 {
2537         struct fc_lport *lport = fip->lp;
2538         struct fc_rport_priv *rdata;
2539         struct fcoe_rport *frport;
2540
2541         frport = fcoe_ctlr_rport(new);
2542         if (frport->flags & FIP_FL_REC_OR_P2P) {
2543                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2544                 return;
2545         }
2546         mutex_lock(&lport->disc.disc_mutex);
2547         rdata = lport->tt.rport_lookup(lport, new->ids.port_id);
2548         if (rdata)
2549                 kref_get(&rdata->kref);
2550         mutex_unlock(&lport->disc.disc_mutex);
2551         if (rdata) {
2552                 if (rdata->ids.node_name == new->ids.node_name &&
2553                     rdata->ids.port_name == new->ids.port_name) {
2554                         frport = fcoe_ctlr_rport(rdata);
2555                         if (!frport->time && fip->state == FIP_ST_VNMP_UP)
2556                                 lport->tt.rport_login(rdata);
2557                         frport->time = jiffies;
2558                 }
2559                 kref_put(&rdata->kref, lport->tt.rport_destroy);
2560                 return;
2561         }
2562         if (fip->state != FIP_ST_VNMP_UP)
2563                 return;
2564
2565         /*
2566          * Beacon from a new neighbor.
2567          * Send a claim notify if one hasn't been sent recently.
2568          * Don't add the neighbor yet.
2569          */
2570         LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
2571                         new->ids.port_id);
2572         if (time_after(jiffies,
2573                        fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
2574                 fcoe_ctlr_vn_send_claim(fip);
2575 }
2576
2577 /**
2578  * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
2579  * @fip: The FCoE controller
2580  *
2581  * Called with ctlr_mutex held.
2582  * Called only in state FIP_ST_VNMP_UP.
2583  * Returns the soonest time for next age-out or a time far in the future.
2584  */
2585 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
2586 {
2587         struct fc_lport *lport = fip->lp;
2588         struct fc_rport_priv *rdata;
2589         struct fcoe_rport *frport;
2590         unsigned long next_time;
2591         unsigned long deadline;
2592
2593         next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
2594         mutex_lock(&lport->disc.disc_mutex);
2595         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
2596                 frport = fcoe_ctlr_rport(rdata);
2597                 if (!frport->time)
2598                         continue;
2599                 deadline = frport->time +
2600                            msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
2601                 if (time_after_eq(jiffies, deadline)) {
2602                         frport->time = 0;
2603                         LIBFCOE_FIP_DBG(fip,
2604                                 "port %16.16llx fc_id %6.6x beacon expired\n",
2605                                 rdata->ids.port_name, rdata->ids.port_id);
2606                         lport->tt.rport_logoff(rdata);
2607                 } else if (time_before(deadline, next_time))
2608                         next_time = deadline;
2609         }
2610         mutex_unlock(&lport->disc.disc_mutex);
2611         return next_time;
2612 }
2613
2614 /**
2615  * fcoe_ctlr_vn_recv() - Receive a FIP frame
2616  * @fip: The FCoE controller that received the frame
2617  * @skb: The received FIP frame
2618  *
2619  * Returns non-zero if the frame is dropped.
2620  * Always consumes the frame.
2621  */
2622 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2623 {
2624         struct fip_header *fiph;
2625         enum fip_vn2vn_subcode sub;
2626         struct {
2627                 struct fc_rport_priv rdata;
2628                 struct fcoe_rport frport;
2629         } buf;
2630         int rc;
2631
2632         fiph = (struct fip_header *)skb->data;
2633         sub = fiph->fip_subcode;
2634
2635         rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata);
2636         if (rc) {
2637                 LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
2638                 goto drop;
2639         }
2640
2641         mutex_lock(&fip->ctlr_mutex);
2642         switch (sub) {
2643         case FIP_SC_VN_PROBE_REQ:
2644                 fcoe_ctlr_vn_probe_req(fip, &buf.rdata);
2645                 break;
2646         case FIP_SC_VN_PROBE_REP:
2647                 fcoe_ctlr_vn_probe_reply(fip, &buf.rdata);
2648                 break;
2649         case FIP_SC_VN_CLAIM_NOTIFY:
2650                 fcoe_ctlr_vn_claim_notify(fip, &buf.rdata);
2651                 break;
2652         case FIP_SC_VN_CLAIM_REP:
2653                 fcoe_ctlr_vn_claim_resp(fip, &buf.rdata);
2654                 break;
2655         case FIP_SC_VN_BEACON:
2656                 fcoe_ctlr_vn_beacon(fip, &buf.rdata);
2657                 break;
2658         default:
2659                 LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
2660                 rc = -1;
2661                 break;
2662         }
2663         mutex_unlock(&fip->ctlr_mutex);
2664 drop:
2665         kfree_skb(skb);
2666         return rc;
2667 }
2668
2669 /**
2670  * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
2671  * @lport: The local port
2672  * @fp: The received frame
2673  *
2674  * This should never be called since we don't see RSCNs or other
2675  * fabric-generated ELSes.
2676  */
2677 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
2678 {
2679         struct fc_seq_els_data rjt_data;
2680
2681         rjt_data.reason = ELS_RJT_UNSUP;
2682         rjt_data.explan = ELS_EXPL_NONE;
2683         lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
2684         fc_frame_free(fp);
2685 }
2686
2687 /**
2688  * fcoe_ctlr_disc_recv - start discovery for VN2VN mode.
2689  * @fip: The FCoE controller
2690  *
2691  * This sets a flag indicating that remote ports should be created
2692  * and started for the peers we discover.  We use the disc_callback
2693  * pointer as that flag.  Peers already discovered are created here.
2694  *
2695  * The lport lock is held during this call. The callback must be done
2696  * later, without holding either the lport or discovery locks.
2697  * The fcoe_ctlr lock may also be held during this call.
2698  */
2699 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
2700                                                   enum fc_disc_event),
2701                                  struct fc_lport *lport)
2702 {
2703         struct fc_disc *disc = &lport->disc;
2704         struct fcoe_ctlr *fip = disc->priv;
2705
2706         mutex_lock(&disc->disc_mutex);
2707         disc->disc_callback = callback;
2708         disc->disc_id = (disc->disc_id + 2) | 1;
2709         disc->pending = 1;
2710         schedule_work(&fip->timer_work);
2711         mutex_unlock(&disc->disc_mutex);
2712 }
2713
2714 /**
2715  * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
2716  * @fip: The FCoE controller
2717  *
2718  * Starts the FLOGI and PLOGI login process to each discovered rport for which
2719  * we've received at least one beacon.
2720  * Performs the discovery complete callback.
2721  */
2722 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
2723 {
2724         struct fc_lport *lport = fip->lp;
2725         struct fc_disc *disc = &lport->disc;
2726         struct fc_rport_priv *rdata;
2727         struct fcoe_rport *frport;
2728         void (*callback)(struct fc_lport *, enum fc_disc_event);
2729
2730         mutex_lock(&disc->disc_mutex);
2731         callback = disc->pending ? disc->disc_callback : NULL;
2732         disc->pending = 0;
2733         list_for_each_entry_rcu(rdata, &disc->rports, peers) {
2734                 frport = fcoe_ctlr_rport(rdata);
2735                 if (frport->time)
2736                         lport->tt.rport_login(rdata);
2737         }
2738         mutex_unlock(&disc->disc_mutex);
2739         if (callback)
2740                 callback(lport, DISC_EV_SUCCESS);
2741 }
2742
2743 /**
2744  * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
2745  * @fip: The FCoE controller
2746  */
2747 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
2748 {
2749         unsigned long next_time;
2750         u8 mac[ETH_ALEN];
2751         u32 new_port_id = 0;
2752
2753         mutex_lock(&fip->ctlr_mutex);
2754         switch (fip->state) {
2755         case FIP_ST_VNMP_START:
2756                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
2757                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2758                 next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
2759                 break;
2760         case FIP_ST_VNMP_PROBE1:
2761                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
2762                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2763                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2764                 break;
2765         case FIP_ST_VNMP_PROBE2:
2766                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
2767                 new_port_id = fip->port_id;
2768                 hton24(mac, FIP_VN_FC_MAP);
2769                 hton24(mac + 3, new_port_id);
2770                 fcoe_ctlr_map_dest(fip);
2771                 fip->update_mac(fip->lp, mac);
2772                 fcoe_ctlr_vn_send_claim(fip);
2773                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2774                 break;
2775         case FIP_ST_VNMP_CLAIM:
2776                 /*
2777                  * This may be invoked either by starting discovery so don't
2778                  * go to the next state unless it's been long enough.
2779                  */
2780                 next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2781                 if (time_after_eq(jiffies, next_time)) {
2782                         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
2783                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2784                                           fcoe_all_vn2vn, 0);
2785                         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2786                         fip->port_ka_time = next_time;
2787                 }
2788                 fcoe_ctlr_vn_disc(fip);
2789                 break;
2790         case FIP_ST_VNMP_UP:
2791                 next_time = fcoe_ctlr_vn_age(fip);
2792                 if (time_after_eq(jiffies, fip->port_ka_time)) {
2793                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2794                                           fcoe_all_vn2vn, 0);
2795                         fip->port_ka_time = jiffies +
2796                                  msecs_to_jiffies(FIP_VN_BEACON_INT +
2797                                         (random32() % FIP_VN_BEACON_FUZZ));
2798                 }
2799                 if (time_before(fip->port_ka_time, next_time))
2800                         next_time = fip->port_ka_time;
2801                 break;
2802         case FIP_ST_LINK_WAIT:
2803                 goto unlock;
2804         default:
2805                 WARN(1, "unexpected state %d\n", fip->state);
2806                 goto unlock;
2807         }
2808         mod_timer(&fip->timer, next_time);
2809 unlock:
2810         mutex_unlock(&fip->ctlr_mutex);
2811
2812         /* If port ID is new, notify local port after dropping ctlr_mutex */
2813         if (new_port_id)
2814                 fc_lport_set_local_id(fip->lp, new_port_id);
2815 }
2816
2817 /**
2818  * fcoe_libfc_config() - Sets up libfc related properties for local port
2819  * @lport:    The local port to configure libfc for
2820  * @fip:      The FCoE controller in use by the local port
2821  * @tt:       The libfc function template
2822  * @init_fcp: If non-zero, the FCP portion of libfc should be initialized
2823  *
2824  * Returns : 0 for success
2825  */
2826 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
2827                       const struct libfc_function_template *tt, int init_fcp)
2828 {
2829         /* Set the function pointers set by the LLDD */
2830         memcpy(&lport->tt, tt, sizeof(*tt));
2831         if (init_fcp && fc_fcp_init(lport))
2832                 return -ENOMEM;
2833         fc_exch_init(lport);
2834         fc_elsct_init(lport);
2835         fc_lport_init(lport);
2836         if (fip->mode == FIP_MODE_VN2VN)
2837                 lport->rport_priv_size = sizeof(struct fcoe_rport);
2838         fc_rport_init(lport);
2839         if (fip->mode == FIP_MODE_VN2VN) {
2840                 lport->point_to_multipoint = 1;
2841                 lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
2842                 lport->tt.disc_start = fcoe_ctlr_disc_start;
2843                 lport->tt.disc_stop = fcoe_ctlr_disc_stop;
2844                 lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
2845                 mutex_init(&lport->disc.disc_mutex);
2846                 INIT_LIST_HEAD(&lport->disc.rports);
2847                 lport->disc.priv = fip;
2848         } else {
2849                 fc_disc_init(lport);
2850         }
2851         return 0;
2852 }
2853 EXPORT_SYMBOL_GPL(fcoe_libfc_config);
2854
2855 void fcoe_fcf_get_selected(struct fcoe_fcf_device *fcf_dev)
2856 {
2857         struct fcoe_ctlr_device *ctlr_dev = fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2858         struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
2859         struct fcoe_fcf *fcf;
2860
2861         mutex_lock(&fip->ctlr_mutex);
2862         mutex_lock(&ctlr_dev->lock);
2863
2864         fcf = fcoe_fcf_device_priv(fcf_dev);
2865         if (fcf)
2866                 fcf_dev->selected = (fcf == fip->sel_fcf) ? 1 : 0;
2867         else
2868                 fcf_dev->selected = 0;
2869
2870         mutex_unlock(&ctlr_dev->lock);
2871         mutex_unlock(&fip->ctlr_mutex);
2872 }
2873 EXPORT_SYMBOL(fcoe_fcf_get_selected);
2874
2875 void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *ctlr_dev)
2876 {
2877         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2878
2879         mutex_lock(&ctlr->ctlr_mutex);
2880         switch (ctlr_dev->mode) {
2881         case FIP_CONN_TYPE_VN2VN:
2882                 ctlr->mode = FIP_MODE_VN2VN;
2883                 break;
2884         case FIP_CONN_TYPE_FABRIC:
2885         default:
2886                 ctlr->mode = FIP_MODE_FABRIC;
2887                 break;
2888         }
2889
2890         mutex_unlock(&ctlr->ctlr_mutex);
2891 }
2892 EXPORT_SYMBOL(fcoe_ctlr_set_fip_mode);