a43dad2238d097c0de69b5599ab439611c17c80c
[linux-3.10.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 /**
164  * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
165  * @fip: The FCoE controller whose FCFs are to be reset
166  *
167  * Called with &fcoe_ctlr lock held.
168  */
169 static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
170 {
171         struct fcoe_fcf *fcf;
172         struct fcoe_fcf *next;
173
174         fip->sel_fcf = NULL;
175         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
176                 list_del(&fcf->list);
177                 kfree(fcf);
178         }
179         fip->fcf_count = 0;
180         fip->sel_time = 0;
181 }
182
183 /**
184  * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
185  * @fip: The FCoE controller to tear down
186  *
187  * This is called by FCoE drivers before freeing the &fcoe_ctlr.
188  *
189  * The receive handler will have been deleted before this to guarantee
190  * that no more recv_work will be scheduled.
191  *
192  * The timer routine will simply return once we set FIP_ST_DISABLED.
193  * This guarantees that no further timeouts or work will be scheduled.
194  */
195 void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
196 {
197         cancel_work_sync(&fip->recv_work);
198         skb_queue_purge(&fip->fip_recv_list);
199
200         mutex_lock(&fip->ctlr_mutex);
201         fcoe_ctlr_set_state(fip, FIP_ST_DISABLED);
202         fcoe_ctlr_reset_fcfs(fip);
203         mutex_unlock(&fip->ctlr_mutex);
204         del_timer_sync(&fip->timer);
205         cancel_work_sync(&fip->timer_work);
206 }
207 EXPORT_SYMBOL(fcoe_ctlr_destroy);
208
209 /**
210  * fcoe_ctlr_announce() - announce new FCF selection
211  * @fip: The FCoE controller
212  *
213  * Also sets the destination MAC for FCoE and control packets
214  *
215  * Called with neither ctlr_mutex nor ctlr_lock held.
216  */
217 static void fcoe_ctlr_announce(struct fcoe_ctlr *fip)
218 {
219         struct fcoe_fcf *sel;
220         struct fcoe_fcf *fcf;
221
222         mutex_lock(&fip->ctlr_mutex);
223         spin_lock_bh(&fip->ctlr_lock);
224
225         kfree_skb(fip->flogi_req);
226         fip->flogi_req = NULL;
227         list_for_each_entry(fcf, &fip->fcfs, list)
228                 fcf->flogi_sent = 0;
229
230         spin_unlock_bh(&fip->ctlr_lock);
231         sel = fip->sel_fcf;
232
233         if (sel && !compare_ether_addr(sel->fcf_mac, fip->dest_addr))
234                 goto unlock;
235         if (!is_zero_ether_addr(fip->dest_addr)) {
236                 printk(KERN_NOTICE "libfcoe: host%d: "
237                        "FIP Fibre-Channel Forwarder MAC %pM deselected\n",
238                        fip->lp->host->host_no, fip->dest_addr);
239                 memset(fip->dest_addr, 0, ETH_ALEN);
240         }
241         if (sel) {
242                 printk(KERN_INFO "libfcoe: host%d: FIP selected "
243                        "Fibre-Channel Forwarder MAC %pM\n",
244                        fip->lp->host->host_no, sel->fcf_mac);
245                 memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN);
246                 fip->map_dest = 0;
247         }
248 unlock:
249         mutex_unlock(&fip->ctlr_mutex);
250 }
251
252 /**
253  * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
254  * @fip: The FCoE controller to get the maximum FCoE size from
255  *
256  * Returns the maximum packet size including the FCoE header and trailer,
257  * but not including any Ethernet or VLAN headers.
258  */
259 static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
260 {
261         /*
262          * Determine the max FCoE frame size allowed, including
263          * FCoE header and trailer.
264          * Note:  lp->mfs is currently the payload size, not the frame size.
265          */
266         return fip->lp->mfs + sizeof(struct fc_frame_header) +
267                 sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
268 }
269
270 /**
271  * fcoe_ctlr_solicit() - Send a FIP solicitation
272  * @fip: The FCoE controller to send the solicitation on
273  * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
274  */
275 static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
276 {
277         struct sk_buff *skb;
278         struct fip_sol {
279                 struct ethhdr eth;
280                 struct fip_header fip;
281                 struct {
282                         struct fip_mac_desc mac;
283                         struct fip_wwn_desc wwnn;
284                         struct fip_size_desc size;
285                 } __packed desc;
286         }  __packed * sol;
287         u32 fcoe_size;
288
289         skb = dev_alloc_skb(sizeof(*sol));
290         if (!skb)
291                 return;
292
293         sol = (struct fip_sol *)skb->data;
294
295         memset(sol, 0, sizeof(*sol));
296         memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
297         memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
298         sol->eth.h_proto = htons(ETH_P_FIP);
299
300         sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
301         sol->fip.fip_op = htons(FIP_OP_DISC);
302         sol->fip.fip_subcode = FIP_SC_SOL;
303         sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
304         sol->fip.fip_flags = htons(FIP_FL_FPMA);
305         if (fip->spma)
306                 sol->fip.fip_flags |= htons(FIP_FL_SPMA);
307
308         sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
309         sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
310         memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
311
312         sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
313         sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
314         put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
315
316         fcoe_size = fcoe_ctlr_fcoe_size(fip);
317         sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
318         sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
319         sol->desc.size.fd_size = htons(fcoe_size);
320
321         skb_put(skb, sizeof(*sol));
322         skb->protocol = htons(ETH_P_FIP);
323         skb->priority = fip->priority;
324         skb_reset_mac_header(skb);
325         skb_reset_network_header(skb);
326         fip->send(fip, skb);
327
328         if (!fcf)
329                 fip->sol_time = jiffies;
330 }
331
332 /**
333  * fcoe_ctlr_link_up() - Start FCoE controller
334  * @fip: The FCoE controller to start
335  *
336  * Called from the LLD when the network link is ready.
337  */
338 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
339 {
340         mutex_lock(&fip->ctlr_mutex);
341         if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
342                 mutex_unlock(&fip->ctlr_mutex);
343                 fc_linkup(fip->lp);
344         } else if (fip->state == FIP_ST_LINK_WAIT) {
345                 fcoe_ctlr_set_state(fip, fip->mode);
346                 switch (fip->mode) {
347                 default:
348                         LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode);
349                         /* fall-through */
350                 case FIP_MODE_AUTO:
351                         LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
352                         /* fall-through */
353                 case FIP_MODE_FABRIC:
354                 case FIP_MODE_NON_FIP:
355                         mutex_unlock(&fip->ctlr_mutex);
356                         fc_linkup(fip->lp);
357                         fcoe_ctlr_solicit(fip, NULL);
358                         break;
359                 case FIP_MODE_VN2VN:
360                         fcoe_ctlr_vn_start(fip);
361                         mutex_unlock(&fip->ctlr_mutex);
362                         fc_linkup(fip->lp);
363                         break;
364                 }
365         } else
366                 mutex_unlock(&fip->ctlr_mutex);
367 }
368 EXPORT_SYMBOL(fcoe_ctlr_link_up);
369
370 /**
371  * fcoe_ctlr_reset() - Reset a FCoE controller
372  * @fip:       The FCoE controller to reset
373  */
374 static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
375 {
376         fcoe_ctlr_reset_fcfs(fip);
377         del_timer(&fip->timer);
378         fip->ctlr_ka_time = 0;
379         fip->port_ka_time = 0;
380         fip->sol_time = 0;
381         fip->flogi_oxid = FC_XID_UNKNOWN;
382         fcoe_ctlr_map_dest(fip);
383 }
384
385 /**
386  * fcoe_ctlr_link_down() - Stop a FCoE controller
387  * @fip: The FCoE controller to be stopped
388  *
389  * Returns non-zero if the link was up and now isn't.
390  *
391  * Called from the LLD when the network link is not ready.
392  * There may be multiple calls while the link is down.
393  */
394 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
395 {
396         int link_dropped;
397
398         LIBFCOE_FIP_DBG(fip, "link down.\n");
399         mutex_lock(&fip->ctlr_mutex);
400         fcoe_ctlr_reset(fip);
401         link_dropped = fip->state != FIP_ST_LINK_WAIT;
402         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
403         mutex_unlock(&fip->ctlr_mutex);
404
405         if (link_dropped)
406                 fc_linkdown(fip->lp);
407         return link_dropped;
408 }
409 EXPORT_SYMBOL(fcoe_ctlr_link_down);
410
411 /**
412  * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
413  * @fip:   The FCoE controller to send the FKA on
414  * @lport: libfc fc_lport to send from
415  * @ports: 0 for controller keep-alive, 1 for port keep-alive
416  * @sa:    The source MAC address
417  *
418  * A controller keep-alive is sent every fka_period (typically 8 seconds).
419  * The source MAC is the native MAC address.
420  *
421  * A port keep-alive is sent every 90 seconds while logged in.
422  * The source MAC is the assigned mapped source address.
423  * The destination is the FCF's F-port.
424  */
425 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
426                                       struct fc_lport *lport,
427                                       int ports, u8 *sa)
428 {
429         struct sk_buff *skb;
430         struct fip_kal {
431                 struct ethhdr eth;
432                 struct fip_header fip;
433                 struct fip_mac_desc mac;
434         } __packed * kal;
435         struct fip_vn_desc *vn;
436         u32 len;
437         struct fc_lport *lp;
438         struct fcoe_fcf *fcf;
439
440         fcf = fip->sel_fcf;
441         lp = fip->lp;
442         if (!fcf || (ports && !lp->port_id))
443                 return;
444
445         len = sizeof(*kal) + ports * sizeof(*vn);
446         skb = dev_alloc_skb(len);
447         if (!skb)
448                 return;
449
450         kal = (struct fip_kal *)skb->data;
451         memset(kal, 0, len);
452         memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
453         memcpy(kal->eth.h_source, sa, ETH_ALEN);
454         kal->eth.h_proto = htons(ETH_P_FIP);
455
456         kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
457         kal->fip.fip_op = htons(FIP_OP_CTRL);
458         kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
459         kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
460                                      ports * sizeof(*vn)) / FIP_BPW);
461         kal->fip.fip_flags = htons(FIP_FL_FPMA);
462         if (fip->spma)
463                 kal->fip.fip_flags |= htons(FIP_FL_SPMA);
464
465         kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
466         kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
467         memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
468         if (ports) {
469                 vn = (struct fip_vn_desc *)(kal + 1);
470                 vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
471                 vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
472                 memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
473                 hton24(vn->fd_fc_id, lport->port_id);
474                 put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
475         }
476         skb_put(skb, len);
477         skb->protocol = htons(ETH_P_FIP);
478         skb->priority = fip->priority;
479         skb_reset_mac_header(skb);
480         skb_reset_network_header(skb);
481         fip->send(fip, skb);
482 }
483
484 /**
485  * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
486  * @fip:   The FCoE controller for the ELS frame
487  * @dtype: The FIP descriptor type for the frame
488  * @skb:   The FCoE ELS frame including FC header but no FCoE headers
489  * @d_id:  The destination port ID.
490  *
491  * Returns non-zero error code on failure.
492  *
493  * The caller must check that the length is a multiple of 4.
494  *
495  * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
496  * Headroom includes the FIP encapsulation description, FIP header, and
497  * Ethernet header.  The tailroom is for the FIP MAC descriptor.
498  */
499 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
500                             u8 dtype, struct sk_buff *skb, u32 d_id)
501 {
502         struct fip_encaps_head {
503                 struct ethhdr eth;
504                 struct fip_header fip;
505                 struct fip_encaps encaps;
506         } __packed * cap;
507         struct fc_frame_header *fh;
508         struct fip_mac_desc *mac;
509         struct fcoe_fcf *fcf;
510         size_t dlen;
511         u16 fip_flags;
512         u8 op;
513
514         fh = (struct fc_frame_header *)skb->data;
515         op = *(u8 *)(fh + 1);
516         dlen = sizeof(struct fip_encaps) + skb->len;    /* len before push */
517         cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));
518         memset(cap, 0, sizeof(*cap));
519
520         if (lport->point_to_multipoint) {
521                 if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest))
522                         return -ENODEV;
523                 fip_flags = 0;
524         } else {
525                 fcf = fip->sel_fcf;
526                 if (!fcf)
527                         return -ENODEV;
528                 fip_flags = fcf->flags;
529                 fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA :
530                                          FIP_FL_FPMA;
531                 if (!fip_flags)
532                         return -ENODEV;
533                 memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
534         }
535         memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
536         cap->eth.h_proto = htons(ETH_P_FIP);
537
538         cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
539         cap->fip.fip_op = htons(FIP_OP_LS);
540         if (op == ELS_LS_ACC || op == ELS_LS_RJT)
541                 cap->fip.fip_subcode = FIP_SC_REP;
542         else
543                 cap->fip.fip_subcode = FIP_SC_REQ;
544         cap->fip.fip_flags = htons(fip_flags);
545
546         cap->encaps.fd_desc.fip_dtype = dtype;
547         cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
548
549         if (op != ELS_LS_RJT) {
550                 dlen += sizeof(*mac);
551                 mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
552                 memset(mac, 0, sizeof(*mac));
553                 mac->fd_desc.fip_dtype = FIP_DT_MAC;
554                 mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
555                 if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
556                         memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
557                 } else if (fip->mode == FIP_MODE_VN2VN) {
558                         hton24(mac->fd_mac, FIP_VN_FC_MAP);
559                         hton24(mac->fd_mac + 3, fip->port_id);
560                 } else if (fip_flags & FIP_FL_SPMA) {
561                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
562                         memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
563                 } else {
564                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
565                         /* FPMA only FLOGI.  Must leave the MAC desc zeroed. */
566                 }
567         }
568         cap->fip.fip_dl_len = htons(dlen / FIP_BPW);
569
570         skb->protocol = htons(ETH_P_FIP);
571         skb->priority = fip->priority;
572         skb_reset_mac_header(skb);
573         skb_reset_network_header(skb);
574         return 0;
575 }
576
577 /**
578  * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
579  * @fip:        FCoE controller.
580  * @lport:      libfc fc_lport to send from
581  * @skb:        FCoE ELS frame including FC header but no FCoE headers.
582  *
583  * Returns a non-zero error code if the frame should not be sent.
584  * Returns zero if the caller should send the frame with FCoE encapsulation.
585  *
586  * The caller must check that the length is a multiple of 4.
587  * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
588  * The the skb must also be an fc_frame.
589  *
590  * This is called from the lower-level driver with spinlocks held,
591  * so we must not take a mutex here.
592  */
593 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
594                        struct sk_buff *skb)
595 {
596         struct fc_frame *fp;
597         struct fc_frame_header *fh;
598         u16 old_xid;
599         u8 op;
600         u8 mac[ETH_ALEN];
601
602         fp = container_of(skb, struct fc_frame, skb);
603         fh = (struct fc_frame_header *)skb->data;
604         op = *(u8 *)(fh + 1);
605
606         if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) {
607                 old_xid = fip->flogi_oxid;
608                 fip->flogi_oxid = ntohs(fh->fh_ox_id);
609                 if (fip->state == FIP_ST_AUTO) {
610                         if (old_xid == FC_XID_UNKNOWN)
611                                 fip->flogi_count = 0;
612                         fip->flogi_count++;
613                         if (fip->flogi_count < 3)
614                                 goto drop;
615                         fcoe_ctlr_map_dest(fip);
616                         return 0;
617                 }
618                 if (fip->state == FIP_ST_NON_FIP)
619                         fcoe_ctlr_map_dest(fip);
620         }
621
622         if (fip->state == FIP_ST_NON_FIP)
623                 return 0;
624         if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN)
625                 goto drop;
626         switch (op) {
627         case ELS_FLOGI:
628                 op = FIP_DT_FLOGI;
629                 if (fip->mode == FIP_MODE_VN2VN)
630                         break;
631                 spin_lock_bh(&fip->ctlr_lock);
632                 kfree_skb(fip->flogi_req);
633                 fip->flogi_req = skb;
634                 fip->flogi_req_send = 1;
635                 spin_unlock_bh(&fip->ctlr_lock);
636                 schedule_work(&fip->timer_work);
637                 return -EINPROGRESS;
638         case ELS_FDISC:
639                 if (ntoh24(fh->fh_s_id))
640                         return 0;
641                 op = FIP_DT_FDISC;
642                 break;
643         case ELS_LOGO:
644                 if (fip->mode == FIP_MODE_VN2VN) {
645                         if (fip->state != FIP_ST_VNMP_UP)
646                                 return -EINVAL;
647                         if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI)
648                                 return -EINVAL;
649                 } else {
650                         if (fip->state != FIP_ST_ENABLED)
651                                 return 0;
652                         if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
653                                 return 0;
654                 }
655                 op = FIP_DT_LOGO;
656                 break;
657         case ELS_LS_ACC:
658                 /*
659                  * If non-FIP, we may have gotten an SID by accepting an FLOGI
660                  * from a point-to-point connection.  Switch to using
661                  * the source mac based on the SID.  The destination
662                  * MAC in this case would have been set by receiving the
663                  * FLOGI.
664                  */
665                 if (fip->state == FIP_ST_NON_FIP) {
666                         if (fip->flogi_oxid == FC_XID_UNKNOWN)
667                                 return 0;
668                         fip->flogi_oxid = FC_XID_UNKNOWN;
669                         fc_fcoe_set_mac(mac, fh->fh_d_id);
670                         fip->update_mac(lport, mac);
671                 }
672                 /* fall through */
673         case ELS_LS_RJT:
674                 op = fr_encaps(fp);
675                 if (op)
676                         break;
677                 return 0;
678         default:
679                 if (fip->state != FIP_ST_ENABLED &&
680                     fip->state != FIP_ST_VNMP_UP)
681                         goto drop;
682                 return 0;
683         }
684         LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n",
685                         op, ntoh24(fh->fh_d_id));
686         if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id)))
687                 goto drop;
688         fip->send(fip, skb);
689         return -EINPROGRESS;
690 drop:
691         kfree_skb(skb);
692         return -EINVAL;
693 }
694 EXPORT_SYMBOL(fcoe_ctlr_els_send);
695
696 /**
697  * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
698  * @fip: The FCoE controller to free FCFs on
699  *
700  * Called with lock held and preemption disabled.
701  *
702  * An FCF is considered old if we have missed two advertisements.
703  * That is, there have been no valid advertisement from it for 2.5
704  * times its keep-alive period.
705  *
706  * In addition, determine the time when an FCF selection can occur.
707  *
708  * Also, increment the MissDiscAdvCount when no advertisement is received
709  * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
710  *
711  * Returns the time in jiffies for the next call.
712  */
713 static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
714 {
715         struct fcoe_fcf *fcf;
716         struct fcoe_fcf *next;
717         unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
718         unsigned long deadline;
719         unsigned long sel_time = 0;
720         struct fcoe_dev_stats *stats;
721
722         stats = per_cpu_ptr(fip->lp->dev_stats, get_cpu());
723
724         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
725                 deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
726                 if (fip->sel_fcf == fcf) {
727                         if (time_after(jiffies, deadline)) {
728                                 stats->MissDiscAdvCount++;
729                                 printk(KERN_INFO "libfcoe: host%d: "
730                                        "Missing Discovery Advertisement "
731                                        "for fab %16.16llx count %lld\n",
732                                        fip->lp->host->host_no, fcf->fabric_name,
733                                        stats->MissDiscAdvCount);
734                         } else if (time_after(next_timer, deadline))
735                                 next_timer = deadline;
736                 }
737
738                 deadline += fcf->fka_period;
739                 if (time_after_eq(jiffies, deadline)) {
740                         if (fip->sel_fcf == fcf)
741                                 fip->sel_fcf = NULL;
742                         list_del(&fcf->list);
743                         WARN_ON(!fip->fcf_count);
744                         fip->fcf_count--;
745                         kfree(fcf);
746                         stats->VLinkFailureCount++;
747                 } else {
748                         if (time_after(next_timer, deadline))
749                                 next_timer = deadline;
750                         if (fcoe_ctlr_mtu_valid(fcf) &&
751                             (!sel_time || time_before(sel_time, fcf->time)))
752                                 sel_time = fcf->time;
753                 }
754         }
755         put_cpu();
756         if (sel_time && !fip->sel_fcf && !fip->sel_time) {
757                 sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
758                 fip->sel_time = sel_time;
759         }
760
761         return next_timer;
762 }
763
764 /**
765  * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
766  * @fip: The FCoE controller receiving the advertisement
767  * @skb: The received FIP advertisement frame
768  * @fcf: The resulting FCF entry
769  *
770  * Returns zero on a valid parsed advertisement,
771  * otherwise returns non zero value.
772  */
773 static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
774                                struct sk_buff *skb, struct fcoe_fcf *fcf)
775 {
776         struct fip_header *fiph;
777         struct fip_desc *desc = NULL;
778         struct fip_wwn_desc *wwn;
779         struct fip_fab_desc *fab;
780         struct fip_fka_desc *fka;
781         unsigned long t;
782         size_t rlen;
783         size_t dlen;
784         u32 desc_mask;
785
786         memset(fcf, 0, sizeof(*fcf));
787         fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
788
789         fiph = (struct fip_header *)skb->data;
790         fcf->flags = ntohs(fiph->fip_flags);
791
792         /*
793          * mask of required descriptors. validating each one clears its bit.
794          */
795         desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
796                         BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA);
797
798         rlen = ntohs(fiph->fip_dl_len) * 4;
799         if (rlen + sizeof(*fiph) > skb->len)
800                 return -EINVAL;
801
802         desc = (struct fip_desc *)(fiph + 1);
803         while (rlen > 0) {
804                 dlen = desc->fip_dlen * FIP_BPW;
805                 if (dlen < sizeof(*desc) || dlen > rlen)
806                         return -EINVAL;
807                 /* Drop Adv if there are duplicate critical descriptors */
808                 if ((desc->fip_dtype < 32) &&
809                     !(desc_mask & 1U << desc->fip_dtype)) {
810                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
811                                         "Descriptors in FIP adv\n");
812                         return -EINVAL;
813                 }
814                 switch (desc->fip_dtype) {
815                 case FIP_DT_PRI:
816                         if (dlen != sizeof(struct fip_pri_desc))
817                                 goto len_err;
818                         fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
819                         desc_mask &= ~BIT(FIP_DT_PRI);
820                         break;
821                 case FIP_DT_MAC:
822                         if (dlen != sizeof(struct fip_mac_desc))
823                                 goto len_err;
824                         memcpy(fcf->fcf_mac,
825                                ((struct fip_mac_desc *)desc)->fd_mac,
826                                ETH_ALEN);
827                         if (!is_valid_ether_addr(fcf->fcf_mac)) {
828                                 LIBFCOE_FIP_DBG(fip,
829                                         "Invalid MAC addr %pM in FIP adv\n",
830                                         fcf->fcf_mac);
831                                 return -EINVAL;
832                         }
833                         desc_mask &= ~BIT(FIP_DT_MAC);
834                         break;
835                 case FIP_DT_NAME:
836                         if (dlen != sizeof(struct fip_wwn_desc))
837                                 goto len_err;
838                         wwn = (struct fip_wwn_desc *)desc;
839                         fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
840                         desc_mask &= ~BIT(FIP_DT_NAME);
841                         break;
842                 case FIP_DT_FAB:
843                         if (dlen != sizeof(struct fip_fab_desc))
844                                 goto len_err;
845                         fab = (struct fip_fab_desc *)desc;
846                         fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
847                         fcf->vfid = ntohs(fab->fd_vfid);
848                         fcf->fc_map = ntoh24(fab->fd_map);
849                         desc_mask &= ~BIT(FIP_DT_FAB);
850                         break;
851                 case FIP_DT_FKA:
852                         if (dlen != sizeof(struct fip_fka_desc))
853                                 goto len_err;
854                         fka = (struct fip_fka_desc *)desc;
855                         if (fka->fd_flags & FIP_FKA_ADV_D)
856                                 fcf->fd_flags = 1;
857                         t = ntohl(fka->fd_fka_period);
858                         if (t >= FCOE_CTLR_MIN_FKA)
859                                 fcf->fka_period = msecs_to_jiffies(t);
860                         desc_mask &= ~BIT(FIP_DT_FKA);
861                         break;
862                 case FIP_DT_MAP_OUI:
863                 case FIP_DT_FCOE_SIZE:
864                 case FIP_DT_FLOGI:
865                 case FIP_DT_FDISC:
866                 case FIP_DT_LOGO:
867                 case FIP_DT_ELP:
868                 default:
869                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
870                                         "in FIP adv\n", desc->fip_dtype);
871                         /* standard says ignore unknown descriptors >= 128 */
872                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
873                                 return -EINVAL;
874                         break;
875                 }
876                 desc = (struct fip_desc *)((char *)desc + dlen);
877                 rlen -= dlen;
878         }
879         if (!fcf->fc_map || (fcf->fc_map & 0x10000))
880                 return -EINVAL;
881         if (!fcf->switch_name)
882                 return -EINVAL;
883         if (desc_mask) {
884                 LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n",
885                                 desc_mask);
886                 return -EINVAL;
887         }
888         return 0;
889
890 len_err:
891         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
892                         desc->fip_dtype, dlen);
893         return -EINVAL;
894 }
895
896 /**
897  * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
898  * @fip: The FCoE controller receiving the advertisement
899  * @skb: The received FIP packet
900  */
901 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
902 {
903         struct fcoe_fcf *fcf;
904         struct fcoe_fcf new;
905         struct fcoe_fcf *found;
906         unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
907         int first = 0;
908         int mtu_valid;
909
910         if (fcoe_ctlr_parse_adv(fip, skb, &new))
911                 return;
912
913         mutex_lock(&fip->ctlr_mutex);
914         first = list_empty(&fip->fcfs);
915         found = NULL;
916         list_for_each_entry(fcf, &fip->fcfs, list) {
917                 if (fcf->switch_name == new.switch_name &&
918                     fcf->fabric_name == new.fabric_name &&
919                     fcf->fc_map == new.fc_map &&
920                     compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) {
921                         found = fcf;
922                         break;
923                 }
924         }
925         if (!found) {
926                 if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
927                         goto out;
928
929                 fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
930                 if (!fcf)
931                         goto out;
932
933                 fip->fcf_count++;
934                 memcpy(fcf, &new, sizeof(new));
935                 list_add(&fcf->list, &fip->fcfs);
936         } else {
937                 /*
938                  * Update the FCF's keep-alive descriptor flags.
939                  * Other flag changes from new advertisements are
940                  * ignored after a solicited advertisement is
941                  * received and the FCF is selectable (usable).
942                  */
943                 fcf->fd_flags = new.fd_flags;
944                 if (!fcoe_ctlr_fcf_usable(fcf))
945                         fcf->flags = new.flags;
946
947                 if (fcf == fip->sel_fcf && !fcf->fd_flags) {
948                         fip->ctlr_ka_time -= fcf->fka_period;
949                         fip->ctlr_ka_time += new.fka_period;
950                         if (time_before(fip->ctlr_ka_time, fip->timer.expires))
951                                 mod_timer(&fip->timer, fip->ctlr_ka_time);
952                 }
953                 fcf->fka_period = new.fka_period;
954                 memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
955         }
956         mtu_valid = fcoe_ctlr_mtu_valid(fcf);
957         fcf->time = jiffies;
958         if (!found)
959                 LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
960                                 fcf->fabric_name, fcf->fcf_mac);
961
962         /*
963          * If this advertisement is not solicited and our max receive size
964          * hasn't been verified, send a solicited advertisement.
965          */
966         if (!mtu_valid)
967                 fcoe_ctlr_solicit(fip, fcf);
968
969         /*
970          * If its been a while since we did a solicit, and this is
971          * the first advertisement we've received, do a multicast
972          * solicitation to gather as many advertisements as we can
973          * before selection occurs.
974          */
975         if (first && time_after(jiffies, fip->sol_time + sol_tov))
976                 fcoe_ctlr_solicit(fip, NULL);
977
978         /*
979          * Put this FCF at the head of the list for priority among equals.
980          * This helps in the case of an NPV switch which insists we use
981          * the FCF that answers multicast solicitations, not the others that
982          * are sending periodic multicast advertisements.
983          */
984         if (mtu_valid)
985                 list_move(&fcf->list, &fip->fcfs);
986
987         /*
988          * If this is the first validated FCF, note the time and
989          * set a timer to trigger selection.
990          */
991         if (mtu_valid && !fip->sel_fcf && fcoe_ctlr_fcf_usable(fcf)) {
992                 fip->sel_time = jiffies +
993                         msecs_to_jiffies(FCOE_CTLR_START_DELAY);
994                 if (!timer_pending(&fip->timer) ||
995                     time_before(fip->sel_time, fip->timer.expires))
996                         mod_timer(&fip->timer, fip->sel_time);
997         }
998 out:
999         mutex_unlock(&fip->ctlr_mutex);
1000 }
1001
1002 /**
1003  * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
1004  * @fip: The FCoE controller which received the packet
1005  * @skb: The received FIP packet
1006  */
1007 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
1008 {
1009         struct fc_lport *lport = fip->lp;
1010         struct fip_header *fiph;
1011         struct fc_frame *fp = (struct fc_frame *)skb;
1012         struct fc_frame_header *fh = NULL;
1013         struct fip_desc *desc;
1014         struct fip_encaps *els;
1015         struct fcoe_dev_stats *stats;
1016         enum fip_desc_type els_dtype = 0;
1017         u8 els_op;
1018         u8 sub;
1019         u8 granted_mac[ETH_ALEN] = { 0 };
1020         size_t els_len = 0;
1021         size_t rlen;
1022         size_t dlen;
1023         u32 desc_mask = 0;
1024         u32 desc_cnt = 0;
1025
1026         fiph = (struct fip_header *)skb->data;
1027         sub = fiph->fip_subcode;
1028         if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
1029                 goto drop;
1030
1031         rlen = ntohs(fiph->fip_dl_len) * 4;
1032         if (rlen + sizeof(*fiph) > skb->len)
1033                 goto drop;
1034
1035         desc = (struct fip_desc *)(fiph + 1);
1036         while (rlen > 0) {
1037                 desc_cnt++;
1038                 dlen = desc->fip_dlen * FIP_BPW;
1039                 if (dlen < sizeof(*desc) || dlen > rlen)
1040                         goto drop;
1041                 /* Drop ELS if there are duplicate critical descriptors */
1042                 if (desc->fip_dtype < 32) {
1043                         if (desc_mask & 1U << desc->fip_dtype) {
1044                                 LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1045                                                 "Descriptors in FIP ELS\n");
1046                                 goto drop;
1047                         }
1048                         desc_mask |= (1 << desc->fip_dtype);
1049                 }
1050                 switch (desc->fip_dtype) {
1051                 case FIP_DT_MAC:
1052                         if (desc_cnt == 1) {
1053                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1054                                                 "received out of order\n");
1055                                 goto drop;
1056                         }
1057
1058                         if (dlen != sizeof(struct fip_mac_desc))
1059                                 goto len_err;
1060                         memcpy(granted_mac,
1061                                ((struct fip_mac_desc *)desc)->fd_mac,
1062                                ETH_ALEN);
1063                         break;
1064                 case FIP_DT_FLOGI:
1065                 case FIP_DT_FDISC:
1066                 case FIP_DT_LOGO:
1067                 case FIP_DT_ELP:
1068                         if (desc_cnt != 1) {
1069                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1070                                                 "received out of order\n");
1071                                 goto drop;
1072                         }
1073                         if (fh)
1074                                 goto drop;
1075                         if (dlen < sizeof(*els) + sizeof(*fh) + 1)
1076                                 goto len_err;
1077                         els_len = dlen - sizeof(*els);
1078                         els = (struct fip_encaps *)desc;
1079                         fh = (struct fc_frame_header *)(els + 1);
1080                         els_dtype = desc->fip_dtype;
1081                         break;
1082                 default:
1083                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
1084                                         "in FIP adv\n", desc->fip_dtype);
1085                         /* standard says ignore unknown descriptors >= 128 */
1086                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1087                                 goto drop;
1088                         if (desc_cnt <= 2) {
1089                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1090                                                 "received out of order\n");
1091                                 goto drop;
1092                         }
1093                         break;
1094                 }
1095                 desc = (struct fip_desc *)((char *)desc + dlen);
1096                 rlen -= dlen;
1097         }
1098
1099         if (!fh)
1100                 goto drop;
1101         els_op = *(u8 *)(fh + 1);
1102
1103         if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) &&
1104             sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) {
1105                 if (els_op == ELS_LS_ACC) {
1106                         if (!is_valid_ether_addr(granted_mac)) {
1107                                 LIBFCOE_FIP_DBG(fip,
1108                                         "Invalid MAC address %pM in FIP ELS\n",
1109                                         granted_mac);
1110                                 goto drop;
1111                         }
1112                         memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
1113
1114                         if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1115                                 fip->flogi_oxid = FC_XID_UNKNOWN;
1116                                 if (els_dtype == FIP_DT_FLOGI)
1117                                         fcoe_ctlr_announce(fip);
1118                         }
1119                 } else if (els_dtype == FIP_DT_FLOGI &&
1120                            !fcoe_ctlr_flogi_retry(fip))
1121                         goto drop;      /* retrying FLOGI so drop reject */
1122         }
1123
1124         if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
1125             (!(1U << FIP_DT_MAC & desc_mask)))) {
1126                 LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
1127                                 "in FIP ELS\n");
1128                 goto drop;
1129         }
1130
1131         /*
1132          * Convert skb into an fc_frame containing only the ELS.
1133          */
1134         skb_pull(skb, (u8 *)fh - skb->data);
1135         skb_trim(skb, els_len);
1136         fp = (struct fc_frame *)skb;
1137         fc_frame_init(fp);
1138         fr_sof(fp) = FC_SOF_I3;
1139         fr_eof(fp) = FC_EOF_T;
1140         fr_dev(fp) = lport;
1141         fr_encaps(fp) = els_dtype;
1142
1143         stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1144         stats->RxFrames++;
1145         stats->RxWords += skb->len / FIP_BPW;
1146         put_cpu();
1147
1148         fc_exch_recv(lport, fp);
1149         return;
1150
1151 len_err:
1152         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1153                         desc->fip_dtype, dlen);
1154 drop:
1155         kfree_skb(skb);
1156 }
1157
1158 /**
1159  * fcoe_ctlr_recv_els() - Handle an incoming link reset frame
1160  * @fip: The FCoE controller that received the frame
1161  * @fh:  The received FIP header
1162  *
1163  * There may be multiple VN_Port descriptors.
1164  * The overall length has already been checked.
1165  */
1166 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
1167                                      struct fip_header *fh)
1168 {
1169         struct fip_desc *desc;
1170         struct fip_mac_desc *mp;
1171         struct fip_wwn_desc *wp;
1172         struct fip_vn_desc *vp;
1173         size_t rlen;
1174         size_t dlen;
1175         struct fcoe_fcf *fcf = fip->sel_fcf;
1176         struct fc_lport *lport = fip->lp;
1177         struct fc_lport *vn_port = NULL;
1178         u32 desc_mask;
1179         int num_vlink_desc;
1180         int reset_phys_port = 0;
1181         struct fip_vn_desc **vlink_desc_arr = NULL;
1182
1183         LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
1184
1185         if (!fcf || !lport->port_id)
1186                 return;
1187
1188         /*
1189          * mask of required descriptors.  Validating each one clears its bit.
1190          */
1191         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
1192
1193         rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
1194         desc = (struct fip_desc *)(fh + 1);
1195
1196         /*
1197          * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
1198          * before determining max Vx_Port descriptor but a buggy FCF could have
1199          * omited either or both MAC Address and Name Identifier descriptors
1200          */
1201         num_vlink_desc = rlen / sizeof(*vp);
1202         if (num_vlink_desc)
1203                 vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc,
1204                                          GFP_ATOMIC);
1205         if (!vlink_desc_arr)
1206                 return;
1207         num_vlink_desc = 0;
1208
1209         while (rlen >= sizeof(*desc)) {
1210                 dlen = desc->fip_dlen * FIP_BPW;
1211                 if (dlen > rlen)
1212                         goto err;
1213                 /* Drop CVL if there are duplicate critical descriptors */
1214                 if ((desc->fip_dtype < 32) &&
1215                     (desc->fip_dtype != FIP_DT_VN_ID) &&
1216                     !(desc_mask & 1U << desc->fip_dtype)) {
1217                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1218                                         "Descriptors in FIP CVL\n");
1219                         goto err;
1220                 }
1221                 switch (desc->fip_dtype) {
1222                 case FIP_DT_MAC:
1223                         mp = (struct fip_mac_desc *)desc;
1224                         if (dlen < sizeof(*mp))
1225                                 goto err;
1226                         if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
1227                                 goto err;
1228                         desc_mask &= ~BIT(FIP_DT_MAC);
1229                         break;
1230                 case FIP_DT_NAME:
1231                         wp = (struct fip_wwn_desc *)desc;
1232                         if (dlen < sizeof(*wp))
1233                                 goto err;
1234                         if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
1235                                 goto err;
1236                         desc_mask &= ~BIT(FIP_DT_NAME);
1237                         break;
1238                 case FIP_DT_VN_ID:
1239                         vp = (struct fip_vn_desc *)desc;
1240                         if (dlen < sizeof(*vp))
1241                                 goto err;
1242                         vlink_desc_arr[num_vlink_desc++] = vp;
1243                         vn_port = fc_vport_id_lookup(lport,
1244                                                       ntoh24(vp->fd_fc_id));
1245                         if (vn_port && (vn_port == lport)) {
1246                                 mutex_lock(&fip->ctlr_mutex);
1247                                 per_cpu_ptr(lport->dev_stats,
1248                                             get_cpu())->VLinkFailureCount++;
1249                                 put_cpu();
1250                                 fcoe_ctlr_reset(fip);
1251                                 mutex_unlock(&fip->ctlr_mutex);
1252                         }
1253                         break;
1254                 default:
1255                         /* standard says ignore unknown descriptors >= 128 */
1256                         if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
1257                                 goto err;
1258                         break;
1259                 }
1260                 desc = (struct fip_desc *)((char *)desc + dlen);
1261                 rlen -= dlen;
1262         }
1263
1264         /*
1265          * reset only if all required descriptors were present and valid.
1266          */
1267         if (desc_mask)
1268                 LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
1269                                 desc_mask);
1270         else if (!num_vlink_desc) {
1271                 LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
1272                 /*
1273                  * No Vx_Port description. Clear all NPIV ports,
1274                  * followed by physical port
1275                  */
1276                 mutex_lock(&fip->ctlr_mutex);
1277                 per_cpu_ptr(lport->dev_stats,
1278                             get_cpu())->VLinkFailureCount++;
1279                 put_cpu();
1280                 fcoe_ctlr_reset(fip);
1281                 mutex_unlock(&fip->ctlr_mutex);
1282
1283                 mutex_lock(&lport->lp_mutex);
1284                 list_for_each_entry(vn_port, &lport->vports, list)
1285                         fc_lport_reset(vn_port);
1286                 mutex_unlock(&lport->lp_mutex);
1287
1288                 fc_lport_reset(fip->lp);
1289                 fcoe_ctlr_solicit(fip, NULL);
1290         } else {
1291                 int i;
1292
1293                 LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
1294                 for (i = 0; i < num_vlink_desc; i++) {
1295                         vp = vlink_desc_arr[i];
1296                         vn_port = fc_vport_id_lookup(lport,
1297                                                      ntoh24(vp->fd_fc_id));
1298                         if (!vn_port)
1299                                 continue;
1300
1301                         /*
1302                          * 'port_id' is already validated, check MAC address and
1303                          * wwpn
1304                          */
1305                         if (compare_ether_addr(fip->get_src_addr(vn_port),
1306                                                 vp->fd_mac) != 0 ||
1307                                 get_unaligned_be64(&vp->fd_wwpn) !=
1308                                                         vn_port->wwpn)
1309                                 continue;
1310
1311                         if (vn_port == lport)
1312                                 /*
1313                                  * Physical port, defer processing till all
1314                                  * listed NPIV ports are cleared
1315                                  */
1316                                 reset_phys_port = 1;
1317                         else    /* NPIV port */
1318                                 fc_lport_reset(vn_port);
1319                 }
1320
1321                 if (reset_phys_port) {
1322                         fc_lport_reset(fip->lp);
1323                         fcoe_ctlr_solicit(fip, NULL);
1324                 }
1325         }
1326
1327 err:
1328         kfree(vlink_desc_arr);
1329 }
1330
1331 /**
1332  * fcoe_ctlr_recv() - Receive a FIP packet
1333  * @fip: The FCoE controller that received the packet
1334  * @skb: The received FIP packet
1335  *
1336  * This may be called from either NET_RX_SOFTIRQ or IRQ.
1337  */
1338 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1339 {
1340         skb_queue_tail(&fip->fip_recv_list, skb);
1341         schedule_work(&fip->recv_work);
1342 }
1343 EXPORT_SYMBOL(fcoe_ctlr_recv);
1344
1345 /**
1346  * fcoe_ctlr_recv_handler() - Receive a FIP frame
1347  * @fip: The FCoE controller that received the frame
1348  * @skb: The received FIP frame
1349  *
1350  * Returns non-zero if the frame is dropped.
1351  */
1352 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
1353 {
1354         struct fip_header *fiph;
1355         struct ethhdr *eh;
1356         enum fip_state state;
1357         u16 op;
1358         u8 sub;
1359
1360         if (skb_linearize(skb))
1361                 goto drop;
1362         if (skb->len < sizeof(*fiph))
1363                 goto drop;
1364         eh = eth_hdr(skb);
1365         if (fip->mode == FIP_MODE_VN2VN) {
1366                 if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1367                     compare_ether_addr(eh->h_dest, fcoe_all_vn2vn) &&
1368                     compare_ether_addr(eh->h_dest, fcoe_all_p2p))
1369                         goto drop;
1370         } else if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
1371                    compare_ether_addr(eh->h_dest, fcoe_all_enode))
1372                 goto drop;
1373         fiph = (struct fip_header *)skb->data;
1374         op = ntohs(fiph->fip_op);
1375         sub = fiph->fip_subcode;
1376
1377         if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
1378                 goto drop;
1379         if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
1380                 goto drop;
1381
1382         mutex_lock(&fip->ctlr_mutex);
1383         state = fip->state;
1384         if (state == FIP_ST_AUTO) {
1385                 fip->map_dest = 0;
1386                 fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
1387                 state = FIP_ST_ENABLED;
1388                 LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
1389         }
1390         mutex_unlock(&fip->ctlr_mutex);
1391
1392         if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
1393                 return fcoe_ctlr_vn_recv(fip, skb);
1394
1395         if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
1396             state != FIP_ST_VNMP_CLAIM)
1397                 goto drop;
1398
1399         if (op == FIP_OP_LS) {
1400                 fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
1401                 return 0;
1402         }
1403
1404         if (state != FIP_ST_ENABLED)
1405                 goto drop;
1406
1407         if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
1408                 fcoe_ctlr_recv_adv(fip, skb);
1409         else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
1410                 fcoe_ctlr_recv_clr_vlink(fip, fiph);
1411         kfree_skb(skb);
1412         return 0;
1413 drop:
1414         kfree_skb(skb);
1415         return -1;
1416 }
1417
1418 /**
1419  * fcoe_ctlr_select() - Select the best FCF (if possible)
1420  * @fip: The FCoE controller
1421  *
1422  * Returns the selected FCF, or NULL if none are usable.
1423  *
1424  * If there are conflicting advertisements, no FCF can be chosen.
1425  *
1426  * If there is already a selected FCF, this will choose a better one or
1427  * an equivalent one that hasn't already been sent a FLOGI.
1428  *
1429  * Called with lock held.
1430  */
1431 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
1432 {
1433         struct fcoe_fcf *fcf;
1434         struct fcoe_fcf *best = fip->sel_fcf;
1435         struct fcoe_fcf *first;
1436
1437         first = list_first_entry(&fip->fcfs, struct fcoe_fcf, list);
1438
1439         list_for_each_entry(fcf, &fip->fcfs, list) {
1440                 LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
1441                                 "VFID %d mac %pM map %x val %d "
1442                                 "sent %u pri %u\n",
1443                                 fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
1444                                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
1445                                 fcf->flogi_sent, fcf->pri);
1446                 if (fcf->fabric_name != first->fabric_name ||
1447                     fcf->vfid != first->vfid ||
1448                     fcf->fc_map != first->fc_map) {
1449                         LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
1450                                         "or FC-MAP\n");
1451                         return NULL;
1452                 }
1453                 if (fcf->flogi_sent)
1454                         continue;
1455                 if (!fcoe_ctlr_fcf_usable(fcf)) {
1456                         LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
1457                                         "map %x %svalid %savailable\n",
1458                                         fcf->fabric_name, fcf->fc_map,
1459                                         (fcf->flags & FIP_FL_SOL) ? "" : "in",
1460                                         (fcf->flags & FIP_FL_AVAIL) ?
1461                                         "" : "un");
1462                         continue;
1463                 }
1464                 if (!best || fcf->pri < best->pri || best->flogi_sent)
1465                         best = fcf;
1466         }
1467         fip->sel_fcf = best;
1468         if (best) {
1469                 LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
1470                 fip->port_ka_time = jiffies +
1471                         msecs_to_jiffies(FIP_VN_KA_PERIOD);
1472                 fip->ctlr_ka_time = jiffies + best->fka_period;
1473                 if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1474                         mod_timer(&fip->timer, fip->ctlr_ka_time);
1475         }
1476         return best;
1477 }
1478
1479 /**
1480  * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
1481  * @fip: The FCoE controller
1482  *
1483  * Returns non-zero error if it could not be sent.
1484  *
1485  * Called with ctlr_mutex and ctlr_lock held.
1486  * Caller must verify that fip->sel_fcf is not NULL.
1487  */
1488 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
1489 {
1490         struct sk_buff *skb;
1491         struct sk_buff *skb_orig;
1492         struct fc_frame_header *fh;
1493         int error;
1494
1495         skb_orig = fip->flogi_req;
1496         if (!skb_orig)
1497                 return -EINVAL;
1498
1499         /*
1500          * Clone and send the FLOGI request.  If clone fails, use original.
1501          */
1502         skb = skb_clone(skb_orig, GFP_ATOMIC);
1503         if (!skb) {
1504                 skb = skb_orig;
1505                 fip->flogi_req = NULL;
1506         }
1507         fh = (struct fc_frame_header *)skb->data;
1508         error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
1509                                  ntoh24(fh->fh_d_id));
1510         if (error) {
1511                 kfree_skb(skb);
1512                 return error;
1513         }
1514         fip->send(fip, skb);
1515         fip->sel_fcf->flogi_sent = 1;
1516         return 0;
1517 }
1518
1519 /**
1520  * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
1521  * @fip: The FCoE controller
1522  *
1523  * Returns non-zero error code if there's no FLOGI request to retry or
1524  * no alternate FCF available.
1525  */
1526 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
1527 {
1528         struct fcoe_fcf *fcf;
1529         int error;
1530
1531         mutex_lock(&fip->ctlr_mutex);
1532         spin_lock_bh(&fip->ctlr_lock);
1533         LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
1534         fcf = fcoe_ctlr_select(fip);
1535         if (!fcf || fcf->flogi_sent) {
1536                 kfree_skb(fip->flogi_req);
1537                 fip->flogi_req = NULL;
1538                 error = -ENOENT;
1539         } else {
1540                 fcoe_ctlr_solicit(fip, NULL);
1541                 error = fcoe_ctlr_flogi_send_locked(fip);
1542         }
1543         spin_unlock_bh(&fip->ctlr_lock);
1544         mutex_unlock(&fip->ctlr_mutex);
1545         return error;
1546 }
1547
1548
1549 /**
1550  * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
1551  * @fip: The FCoE controller that timed out
1552  *
1553  * Done here because fcoe_ctlr_els_send() can't get mutex.
1554  *
1555  * Called with ctlr_mutex held.  The caller must not hold ctlr_lock.
1556  */
1557 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
1558 {
1559         struct fcoe_fcf *fcf;
1560
1561         spin_lock_bh(&fip->ctlr_lock);
1562         fcf = fip->sel_fcf;
1563         if (!fcf || !fip->flogi_req_send)
1564                 goto unlock;
1565
1566         LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
1567
1568         /*
1569          * If this FLOGI is being sent due to a timeout retry
1570          * to the same FCF as before, select a different FCF if possible.
1571          */
1572         if (fcf->flogi_sent) {
1573                 LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
1574                 fcf = fcoe_ctlr_select(fip);
1575                 if (!fcf || fcf->flogi_sent) {
1576                         LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
1577                         list_for_each_entry(fcf, &fip->fcfs, list)
1578                                 fcf->flogi_sent = 0;
1579                         fcf = fcoe_ctlr_select(fip);
1580                 }
1581         }
1582         if (fcf) {
1583                 fcoe_ctlr_flogi_send_locked(fip);
1584                 fip->flogi_req_send = 0;
1585         } else /* XXX */
1586                 LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
1587 unlock:
1588         spin_unlock_bh(&fip->ctlr_lock);
1589 }
1590
1591 /**
1592  * fcoe_ctlr_timeout() - FIP timeout handler
1593  * @arg: The FCoE controller that timed out
1594  */
1595 static void fcoe_ctlr_timeout(unsigned long arg)
1596 {
1597         struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
1598
1599         schedule_work(&fip->timer_work);
1600 }
1601
1602 /**
1603  * fcoe_ctlr_timer_work() - Worker thread function for timer work
1604  * @work: Handle to a FCoE controller
1605  *
1606  * Ages FCFs.  Triggers FCF selection if possible.
1607  * Sends keep-alives and resets.
1608  */
1609 static void fcoe_ctlr_timer_work(struct work_struct *work)
1610 {
1611         struct fcoe_ctlr *fip;
1612         struct fc_lport *vport;
1613         u8 *mac;
1614         u8 reset = 0;
1615         u8 send_ctlr_ka = 0;
1616         u8 send_port_ka = 0;
1617         struct fcoe_fcf *sel;
1618         struct fcoe_fcf *fcf;
1619         unsigned long next_timer;
1620
1621         fip = container_of(work, struct fcoe_ctlr, timer_work);
1622         if (fip->mode == FIP_MODE_VN2VN)
1623                 return fcoe_ctlr_vn_timeout(fip);
1624         mutex_lock(&fip->ctlr_mutex);
1625         if (fip->state == FIP_ST_DISABLED) {
1626                 mutex_unlock(&fip->ctlr_mutex);
1627                 return;
1628         }
1629
1630         fcf = fip->sel_fcf;
1631         next_timer = fcoe_ctlr_age_fcfs(fip);
1632
1633         sel = fip->sel_fcf;
1634         if (!sel && fip->sel_time) {
1635                 if (time_after_eq(jiffies, fip->sel_time)) {
1636                         sel = fcoe_ctlr_select(fip);
1637                         fip->sel_time = 0;
1638                 } else if (time_after(next_timer, fip->sel_time))
1639                         next_timer = fip->sel_time;
1640         }
1641
1642         if (sel && fip->flogi_req_send)
1643                 fcoe_ctlr_flogi_send(fip);
1644         else if (!sel && fcf)
1645                 reset = 1;
1646
1647         if (sel && !sel->fd_flags) {
1648                 if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
1649                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1650                         send_ctlr_ka = 1;
1651                 }
1652                 if (time_after(next_timer, fip->ctlr_ka_time))
1653                         next_timer = fip->ctlr_ka_time;
1654
1655                 if (time_after_eq(jiffies, fip->port_ka_time)) {
1656                         fip->port_ka_time = jiffies +
1657                                 msecs_to_jiffies(FIP_VN_KA_PERIOD);
1658                         send_port_ka = 1;
1659                 }
1660                 if (time_after(next_timer, fip->port_ka_time))
1661                         next_timer = fip->port_ka_time;
1662         }
1663         if (!list_empty(&fip->fcfs))
1664                 mod_timer(&fip->timer, next_timer);
1665         mutex_unlock(&fip->ctlr_mutex);
1666
1667         if (reset) {
1668                 fc_lport_reset(fip->lp);
1669                 /* restart things with a solicitation */
1670                 fcoe_ctlr_solicit(fip, NULL);
1671         }
1672
1673         if (send_ctlr_ka)
1674                 fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
1675
1676         if (send_port_ka) {
1677                 mutex_lock(&fip->lp->lp_mutex);
1678                 mac = fip->get_src_addr(fip->lp);
1679                 fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
1680                 list_for_each_entry(vport, &fip->lp->vports, list) {
1681                         mac = fip->get_src_addr(vport);
1682                         fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
1683                 }
1684                 mutex_unlock(&fip->lp->lp_mutex);
1685         }
1686 }
1687
1688 /**
1689  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
1690  * @recv_work: Handle to a FCoE controller
1691  */
1692 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
1693 {
1694         struct fcoe_ctlr *fip;
1695         struct sk_buff *skb;
1696
1697         fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1698         while ((skb = skb_dequeue(&fip->fip_recv_list)))
1699                 fcoe_ctlr_recv_handler(fip, skb);
1700 }
1701
1702 /**
1703  * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
1704  * @fip: The FCoE controller
1705  * @fp:  The FC frame to snoop
1706  *
1707  * Snoop potential response to FLOGI or even incoming FLOGI.
1708  *
1709  * The caller has checked that we are waiting for login as indicated
1710  * by fip->flogi_oxid != FC_XID_UNKNOWN.
1711  *
1712  * The caller is responsible for freeing the frame.
1713  * Fill in the granted_mac address.
1714  *
1715  * Return non-zero if the frame should not be delivered to libfc.
1716  */
1717 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
1718                          struct fc_frame *fp)
1719 {
1720         struct fc_frame_header *fh;
1721         u8 op;
1722         u8 *sa;
1723
1724         sa = eth_hdr(&fp->skb)->h_source;
1725         fh = fc_frame_header_get(fp);
1726         if (fh->fh_type != FC_TYPE_ELS)
1727                 return 0;
1728
1729         op = fc_frame_payload_op(fp);
1730         if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
1731             fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1732
1733                 mutex_lock(&fip->ctlr_mutex);
1734                 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
1735                         mutex_unlock(&fip->ctlr_mutex);
1736                         return -EINVAL;
1737                 }
1738                 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1739                 LIBFCOE_FIP_DBG(fip,
1740                                 "received FLOGI LS_ACC using non-FIP mode\n");
1741
1742                 /*
1743                  * FLOGI accepted.
1744                  * If the src mac addr is FC_OUI-based, then we mark the
1745                  * address_mode flag to use FC_OUI-based Ethernet DA.
1746                  * Otherwise we use the FCoE gateway addr
1747                  */
1748                 if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
1749                         fcoe_ctlr_map_dest(fip);
1750                 } else {
1751                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1752                         fip->map_dest = 0;
1753                 }
1754                 fip->flogi_oxid = FC_XID_UNKNOWN;
1755                 mutex_unlock(&fip->ctlr_mutex);
1756                 fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
1757         } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
1758                 /*
1759                  * Save source MAC for point-to-point responses.
1760                  */
1761                 mutex_lock(&fip->ctlr_mutex);
1762                 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
1763                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1764                         fip->map_dest = 0;
1765                         if (fip->state == FIP_ST_AUTO)
1766                                 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
1767                                                 "Setting non-FIP mode\n");
1768                         fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1769                 }
1770                 mutex_unlock(&fip->ctlr_mutex);
1771         }
1772         return 0;
1773 }
1774 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
1775
1776 /**
1777  * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
1778  * @mac:    The MAC address to convert
1779  * @scheme: The scheme to use when converting
1780  * @port:   The port indicator for converting
1781  *
1782  * Returns: u64 fc world wide name
1783  */
1784 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1785                       unsigned int scheme, unsigned int port)
1786 {
1787         u64 wwn;
1788         u64 host_mac;
1789
1790         /* The MAC is in NO, so flip only the low 48 bits */
1791         host_mac = ((u64) mac[0] << 40) |
1792                 ((u64) mac[1] << 32) |
1793                 ((u64) mac[2] << 24) |
1794                 ((u64) mac[3] << 16) |
1795                 ((u64) mac[4] << 8) |
1796                 (u64) mac[5];
1797
1798         WARN_ON(host_mac >= (1ULL << 48));
1799         wwn = host_mac | ((u64) scheme << 60);
1800         switch (scheme) {
1801         case 1:
1802                 WARN_ON(port != 0);
1803                 break;
1804         case 2:
1805                 WARN_ON(port >= 0xfff);
1806                 wwn |= (u64) port << 48;
1807                 break;
1808         default:
1809                 WARN_ON(1);
1810                 break;
1811         }
1812
1813         return wwn;
1814 }
1815 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1816
1817 /**
1818  * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
1819  * @rdata: libfc remote port
1820  */
1821 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
1822 {
1823         return (struct fcoe_rport *)(rdata + 1);
1824 }
1825
1826 /**
1827  * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
1828  * @fip: The FCoE controller
1829  * @sub: sub-opcode for probe request, reply, or advertisement.
1830  * @dest: The destination Ethernet MAC address
1831  * @min_len: minimum size of the Ethernet payload to be sent
1832  */
1833 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
1834                               enum fip_vn2vn_subcode sub,
1835                               const u8 *dest, size_t min_len)
1836 {
1837         struct sk_buff *skb;
1838         struct fip_frame {
1839                 struct ethhdr eth;
1840                 struct fip_header fip;
1841                 struct fip_mac_desc mac;
1842                 struct fip_wwn_desc wwnn;
1843                 struct fip_vn_desc vn;
1844         } __packed * frame;
1845         struct fip_fc4_feat *ff;
1846         struct fip_size_desc *size;
1847         u32 fcp_feat;
1848         size_t len;
1849         size_t dlen;
1850
1851         len = sizeof(*frame);
1852         dlen = 0;
1853         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
1854                 dlen = sizeof(struct fip_fc4_feat) +
1855                        sizeof(struct fip_size_desc);
1856                 len += dlen;
1857         }
1858         dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
1859         len = max(len, min_len + sizeof(struct ethhdr));
1860
1861         skb = dev_alloc_skb(len);
1862         if (!skb)
1863                 return;
1864
1865         frame = (struct fip_frame *)skb->data;
1866         memset(frame, 0, len);
1867         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
1868         memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
1869         frame->eth.h_proto = htons(ETH_P_FIP);
1870
1871         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
1872         frame->fip.fip_op = htons(FIP_OP_VN2VN);
1873         frame->fip.fip_subcode = sub;
1874         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
1875
1876         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
1877         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
1878         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
1879
1880         frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
1881         frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
1882         put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
1883
1884         frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
1885         frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
1886         hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
1887         hton24(frame->vn.fd_mac + 3, fip->port_id);
1888         hton24(frame->vn.fd_fc_id, fip->port_id);
1889         put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
1890
1891         /*
1892          * For claims, add FC-4 features.
1893          * TBD: Add interface to get fc-4 types and features from libfc.
1894          */
1895         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
1896                 ff = (struct fip_fc4_feat *)(frame + 1);
1897                 ff->fd_desc.fip_dtype = FIP_DT_FC4F;
1898                 ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
1899                 ff->fd_fts = fip->lp->fcts;
1900
1901                 fcp_feat = 0;
1902                 if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
1903                         fcp_feat |= FCP_FEAT_INIT;
1904                 if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
1905                         fcp_feat |= FCP_FEAT_TARG;
1906                 fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
1907                 ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
1908
1909                 size = (struct fip_size_desc *)(ff + 1);
1910                 size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
1911                 size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
1912                 size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
1913         }
1914
1915         skb_put(skb, len);
1916         skb->protocol = htons(ETH_P_FIP);
1917         skb->priority = fip->priority;
1918         skb_reset_mac_header(skb);
1919         skb_reset_network_header(skb);
1920
1921         fip->send(fip, skb);
1922 }
1923
1924 /**
1925  * fcoe_ctlr_vn_rport_callback - Event handler for rport events.
1926  * @lport: The lport which is receiving the event
1927  * @rdata: remote port private data
1928  * @event: The event that occurred
1929  *
1930  * Locking Note:  The rport lock must not be held when calling this function.
1931  */
1932 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
1933                                         struct fc_rport_priv *rdata,
1934                                         enum fc_rport_event event)
1935 {
1936         struct fcoe_ctlr *fip = lport->disc.priv;
1937         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
1938
1939         LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
1940                         rdata->ids.port_id, event);
1941
1942         mutex_lock(&fip->ctlr_mutex);
1943         switch (event) {
1944         case RPORT_EV_READY:
1945                 frport->login_count = 0;
1946                 break;
1947         case RPORT_EV_LOGO:
1948         case RPORT_EV_FAILED:
1949         case RPORT_EV_STOP:
1950                 frport->login_count++;
1951                 if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
1952                         LIBFCOE_FIP_DBG(fip,
1953                                         "rport FLOGI limited port_id %6.6x\n",
1954                                         rdata->ids.port_id);
1955                         lport->tt.rport_logoff(rdata);
1956                 }
1957                 break;
1958         default:
1959                 break;
1960         }
1961         mutex_unlock(&fip->ctlr_mutex);
1962 }
1963
1964 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
1965         .event_callback = fcoe_ctlr_vn_rport_callback,
1966 };
1967
1968 /**
1969  * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
1970  * @fip: The FCoE controller
1971  *
1972  * Called with ctlr_mutex held.
1973  */
1974 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
1975 {
1976         mutex_lock(&lport->disc.disc_mutex);
1977         lport->disc.disc_callback = NULL;
1978         mutex_unlock(&lport->disc.disc_mutex);
1979 }
1980
1981 /**
1982  * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
1983  * @fip: The FCoE controller
1984  *
1985  * Called through the local port template for discovery.
1986  * Called without the ctlr_mutex held.
1987  */
1988 static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
1989 {
1990         struct fcoe_ctlr *fip = lport->disc.priv;
1991
1992         mutex_lock(&fip->ctlr_mutex);
1993         fcoe_ctlr_disc_stop_locked(lport);
1994         mutex_unlock(&fip->ctlr_mutex);
1995 }
1996
1997 /**
1998  * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
1999  * @fip: The FCoE controller
2000  *
2001  * Called through the local port template for discovery.
2002  * Called without the ctlr_mutex held.
2003  */
2004 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
2005 {
2006         fcoe_ctlr_disc_stop(lport);
2007         lport->tt.rport_flush_queue();
2008         synchronize_rcu();
2009 }
2010
2011 /**
2012  * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
2013  * @fip: The FCoE controller
2014  *
2015  * Called with fcoe_ctlr lock held.
2016  */
2017 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
2018 {
2019         unsigned long wait;
2020         u32 port_id;
2021
2022         fcoe_ctlr_disc_stop_locked(fip->lp);
2023
2024         /*
2025          * Get proposed port ID.
2026          * If this is the first try after link up, use any previous port_id.
2027          * If there was none, use the low bits of the port_name.
2028          * On subsequent tries, get the next random one.
2029          * Don't use reserved IDs, use another non-zero value, just as random.
2030          */
2031         port_id = fip->port_id;
2032         if (fip->probe_tries)
2033                 port_id = prandom32(&fip->rnd_state) & 0xffff;
2034         else if (!port_id)
2035                 port_id = fip->lp->wwpn & 0xffff;
2036         if (!port_id || port_id == 0xffff)
2037                 port_id = 1;
2038         fip->port_id = port_id;
2039
2040         if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
2041                 fip->probe_tries++;
2042                 wait = random32() % FIP_VN_PROBE_WAIT;
2043         } else
2044                 wait = FIP_VN_RLIM_INT;
2045         mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
2046         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
2047 }
2048
2049 /**
2050  * fcoe_ctlr_vn_start() - Start in VN2VN mode
2051  * @fip: The FCoE controller
2052  *
2053  * Called with fcoe_ctlr lock held.
2054  */
2055 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
2056 {
2057         fip->probe_tries = 0;
2058         prandom32_seed(&fip->rnd_state, fip->lp->wwpn);
2059         fcoe_ctlr_vn_restart(fip);
2060 }
2061
2062 /**
2063  * fcoe_ctlr_vn_parse - parse probe request or response
2064  * @fip: The FCoE controller
2065  * @skb: incoming packet
2066  * @rdata: buffer for resulting parsed VN entry plus fcoe_rport
2067  *
2068  * Returns non-zero error number on error.
2069  * Does not consume the packet.
2070  */
2071 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
2072                               struct sk_buff *skb,
2073                               struct fc_rport_priv *rdata)
2074 {
2075         struct fip_header *fiph;
2076         struct fip_desc *desc = NULL;
2077         struct fip_mac_desc *macd = NULL;
2078         struct fip_wwn_desc *wwn = NULL;
2079         struct fip_vn_desc *vn = NULL;
2080         struct fip_size_desc *size = NULL;
2081         struct fcoe_rport *frport;
2082         size_t rlen;
2083         size_t dlen;
2084         u32 desc_mask = 0;
2085         u32 dtype;
2086         u8 sub;
2087
2088         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2089         frport = fcoe_ctlr_rport(rdata);
2090
2091         fiph = (struct fip_header *)skb->data;
2092         frport->flags = ntohs(fiph->fip_flags);
2093
2094         sub = fiph->fip_subcode;
2095         switch (sub) {
2096         case FIP_SC_VN_PROBE_REQ:
2097         case FIP_SC_VN_PROBE_REP:
2098         case FIP_SC_VN_BEACON:
2099                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2100                             BIT(FIP_DT_VN_ID);
2101                 break;
2102         case FIP_SC_VN_CLAIM_NOTIFY:
2103         case FIP_SC_VN_CLAIM_REP:
2104                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2105                             BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
2106                             BIT(FIP_DT_FCOE_SIZE);
2107                 break;
2108         default:
2109                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2110                 return -EINVAL;
2111         }
2112
2113         rlen = ntohs(fiph->fip_dl_len) * 4;
2114         if (rlen + sizeof(*fiph) > skb->len)
2115                 return -EINVAL;
2116
2117         desc = (struct fip_desc *)(fiph + 1);
2118         while (rlen > 0) {
2119                 dlen = desc->fip_dlen * FIP_BPW;
2120                 if (dlen < sizeof(*desc) || dlen > rlen)
2121                         return -EINVAL;
2122
2123                 dtype = desc->fip_dtype;
2124                 if (dtype < 32) {
2125                         if (!(desc_mask & BIT(dtype))) {
2126                                 LIBFCOE_FIP_DBG(fip,
2127                                                 "unexpected or duplicated desc "
2128                                                 "desc type %u in "
2129                                                 "FIP VN2VN subtype %u\n",
2130                                                 dtype, sub);
2131                                 return -EINVAL;
2132                         }
2133                         desc_mask &= ~BIT(dtype);
2134                 }
2135
2136                 switch (dtype) {
2137                 case FIP_DT_MAC:
2138                         if (dlen != sizeof(struct fip_mac_desc))
2139                                 goto len_err;
2140                         macd = (struct fip_mac_desc *)desc;
2141                         if (!is_valid_ether_addr(macd->fd_mac)) {
2142                                 LIBFCOE_FIP_DBG(fip,
2143                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2144                                          macd->fd_mac);
2145                                 return -EINVAL;
2146                         }
2147                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2148                         break;
2149                 case FIP_DT_NAME:
2150                         if (dlen != sizeof(struct fip_wwn_desc))
2151                                 goto len_err;
2152                         wwn = (struct fip_wwn_desc *)desc;
2153                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2154                         break;
2155                 case FIP_DT_VN_ID:
2156                         if (dlen != sizeof(struct fip_vn_desc))
2157                                 goto len_err;
2158                         vn = (struct fip_vn_desc *)desc;
2159                         memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
2160                         rdata->ids.port_id = ntoh24(vn->fd_fc_id);
2161                         rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn);
2162                         break;
2163                 case FIP_DT_FC4F:
2164                         if (dlen != sizeof(struct fip_fc4_feat))
2165                                 goto len_err;
2166                         break;
2167                 case FIP_DT_FCOE_SIZE:
2168                         if (dlen != sizeof(struct fip_size_desc))
2169                                 goto len_err;
2170                         size = (struct fip_size_desc *)desc;
2171                         frport->fcoe_len = ntohs(size->fd_size);
2172                         break;
2173                 default:
2174                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2175                                         "in FIP probe\n", dtype);
2176                         /* standard says ignore unknown descriptors >= 128 */
2177                         if (dtype < FIP_DT_VENDOR_BASE)
2178                                 return -EINVAL;
2179                         break;
2180                 }
2181                 desc = (struct fip_desc *)((char *)desc + dlen);
2182                 rlen -= dlen;
2183         }
2184         return 0;
2185
2186 len_err:
2187         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2188                         dtype, dlen);
2189         return -EINVAL;
2190 }
2191
2192 /**
2193  * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
2194  * @fip: The FCoE controller
2195  *
2196  * Called with ctlr_mutex held.
2197  */
2198 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
2199 {
2200         fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
2201         fip->sol_time = jiffies;
2202 }
2203
2204 /**
2205  * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
2206  * @fip: The FCoE controller
2207  * @rdata: parsed remote port with frport from the probe request
2208  *
2209  * Called with ctlr_mutex held.
2210  */
2211 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
2212                                    struct fc_rport_priv *rdata)
2213 {
2214         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2215
2216         if (rdata->ids.port_id != fip->port_id)
2217                 return;
2218
2219         switch (fip->state) {
2220         case FIP_ST_VNMP_CLAIM:
2221         case FIP_ST_VNMP_UP:
2222                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2223                                   frport->enode_mac, 0);
2224                 break;
2225         case FIP_ST_VNMP_PROBE1:
2226         case FIP_ST_VNMP_PROBE2:
2227                 /*
2228                  * Decide whether to reply to the Probe.
2229                  * Our selected address is never a "recorded" one, so
2230                  * only reply if our WWPN is greater and the
2231                  * Probe's REC bit is not set.
2232                  * If we don't reply, we will change our address.
2233                  */
2234                 if (fip->lp->wwpn > rdata->ids.port_name &&
2235                     !(frport->flags & FIP_FL_REC_OR_P2P)) {
2236                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2237                                           frport->enode_mac, 0);
2238                         break;
2239                 }
2240                 /* fall through */
2241         case FIP_ST_VNMP_START:
2242                 fcoe_ctlr_vn_restart(fip);
2243                 break;
2244         default:
2245                 break;
2246         }
2247 }
2248
2249 /**
2250  * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
2251  * @fip: The FCoE controller
2252  * @rdata: parsed remote port with frport from the probe request
2253  *
2254  * Called with ctlr_mutex held.
2255  */
2256 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
2257                                    struct fc_rport_priv *rdata)
2258 {
2259         if (rdata->ids.port_id != fip->port_id)
2260                 return;
2261         switch (fip->state) {
2262         case FIP_ST_VNMP_START:
2263         case FIP_ST_VNMP_PROBE1:
2264         case FIP_ST_VNMP_PROBE2:
2265         case FIP_ST_VNMP_CLAIM:
2266                 fcoe_ctlr_vn_restart(fip);
2267                 break;
2268         case FIP_ST_VNMP_UP:
2269                 fcoe_ctlr_vn_send_claim(fip);
2270                 break;
2271         default:
2272                 break;
2273         }
2274 }
2275
2276 /**
2277  * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
2278  * @fip: The FCoE controller
2279  * @new: newly-parsed remote port with frport as a template for new rdata
2280  *
2281  * Called with ctlr_mutex held.
2282  */
2283 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new)
2284 {
2285         struct fc_lport *lport = fip->lp;
2286         struct fc_rport_priv *rdata;
2287         struct fc_rport_identifiers *ids;
2288         struct fcoe_rport *frport;
2289         u32 port_id;
2290
2291         port_id = new->ids.port_id;
2292         if (port_id == fip->port_id)
2293                 return;
2294
2295         mutex_lock(&lport->disc.disc_mutex);
2296         rdata = lport->tt.rport_create(lport, port_id);
2297         if (!rdata) {
2298                 mutex_unlock(&lport->disc.disc_mutex);
2299                 return;
2300         }
2301
2302         rdata->ops = &fcoe_ctlr_vn_rport_ops;
2303         rdata->disc_id = lport->disc.disc_id;
2304
2305         ids = &rdata->ids;
2306         if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) ||
2307             (ids->node_name != -1 && ids->node_name != new->ids.node_name))
2308                 lport->tt.rport_logoff(rdata);
2309         ids->port_name = new->ids.port_name;
2310         ids->node_name = new->ids.node_name;
2311         mutex_unlock(&lport->disc.disc_mutex);
2312
2313         frport = fcoe_ctlr_rport(rdata);
2314         LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s\n",
2315                         port_id, frport->fcoe_len ? "old" : "new");
2316         *frport = *fcoe_ctlr_rport(new);
2317         frport->time = 0;
2318 }
2319
2320 /**
2321  * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
2322  * @fip: The FCoE controller
2323  * @port_id:  The port_id of the remote VN_node
2324  * @mac: buffer which will hold the VN_NODE destination MAC address, if found.
2325  *
2326  * Returns non-zero error if no remote port found.
2327  */
2328 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
2329 {
2330         struct fc_lport *lport = fip->lp;
2331         struct fc_rport_priv *rdata;
2332         struct fcoe_rport *frport;
2333         int ret = -1;
2334
2335         rcu_read_lock();
2336         rdata = lport->tt.rport_lookup(lport, port_id);
2337         if (rdata) {
2338                 frport = fcoe_ctlr_rport(rdata);
2339                 memcpy(mac, frport->enode_mac, ETH_ALEN);
2340                 ret = 0;
2341         }
2342         rcu_read_unlock();
2343         return ret;
2344 }
2345
2346 /**
2347  * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
2348  * @fip: The FCoE controller
2349  * @new: newly-parsed remote port with frport as a template for new rdata
2350  *
2351  * Called with ctlr_mutex held.
2352  */
2353 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
2354                                       struct fc_rport_priv *new)
2355 {
2356         struct fcoe_rport *frport = fcoe_ctlr_rport(new);
2357
2358         if (frport->flags & FIP_FL_REC_OR_P2P) {
2359                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2360                 return;
2361         }
2362         switch (fip->state) {
2363         case FIP_ST_VNMP_START:
2364         case FIP_ST_VNMP_PROBE1:
2365         case FIP_ST_VNMP_PROBE2:
2366                 if (new->ids.port_id == fip->port_id)
2367                         fcoe_ctlr_vn_restart(fip);
2368                 break;
2369         case FIP_ST_VNMP_CLAIM:
2370         case FIP_ST_VNMP_UP:
2371                 if (new->ids.port_id == fip->port_id) {
2372                         if (new->ids.port_name > fip->lp->wwpn) {
2373                                 fcoe_ctlr_vn_restart(fip);
2374                                 break;
2375                         }
2376                         fcoe_ctlr_vn_send_claim(fip);
2377                         break;
2378                 }
2379                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac,
2380                                   min((u32)frport->fcoe_len,
2381                                       fcoe_ctlr_fcoe_size(fip)));
2382                 fcoe_ctlr_vn_add(fip, new);
2383                 break;
2384         default:
2385                 break;
2386         }
2387 }
2388
2389 /**
2390  * fcoe_ctlr_vn_claim_resp() - handle received Claim Response
2391  * @fip: The FCoE controller that received the frame
2392  * @new: newly-parsed remote port with frport from the Claim Response
2393  *
2394  * Called with ctlr_mutex held.
2395  */
2396 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
2397                                     struct fc_rport_priv *new)
2398 {
2399         LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
2400                         new->ids.port_id, fcoe_ctlr_state(fip->state));
2401         if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
2402                 fcoe_ctlr_vn_add(fip, new);
2403 }
2404
2405 /**
2406  * fcoe_ctlr_vn_beacon() - handle received beacon.
2407  * @fip: The FCoE controller that received the frame
2408  * @new: newly-parsed remote port with frport from the Beacon
2409  *
2410  * Called with ctlr_mutex held.
2411  */
2412 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
2413                                 struct fc_rport_priv *new)
2414 {
2415         struct fc_lport *lport = fip->lp;
2416         struct fc_rport_priv *rdata;
2417         struct fcoe_rport *frport;
2418
2419         frport = fcoe_ctlr_rport(new);
2420         if (frport->flags & FIP_FL_REC_OR_P2P) {
2421                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2422                 return;
2423         }
2424         mutex_lock(&lport->disc.disc_mutex);
2425         rdata = lport->tt.rport_lookup(lport, new->ids.port_id);
2426         if (rdata)
2427                 kref_get(&rdata->kref);
2428         mutex_unlock(&lport->disc.disc_mutex);
2429         if (rdata) {
2430                 if (rdata->ids.node_name == new->ids.node_name &&
2431                     rdata->ids.port_name == new->ids.port_name) {
2432                         frport = fcoe_ctlr_rport(rdata);
2433                         if (!frport->time && fip->state == FIP_ST_VNMP_UP)
2434                                 lport->tt.rport_login(rdata);
2435                         frport->time = jiffies;
2436                 }
2437                 kref_put(&rdata->kref, lport->tt.rport_destroy);
2438                 return;
2439         }
2440         if (fip->state != FIP_ST_VNMP_UP)
2441                 return;
2442
2443         /*
2444          * Beacon from a new neighbor.
2445          * Send a claim notify if one hasn't been sent recently.
2446          * Don't add the neighbor yet.
2447          */
2448         LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
2449                         new->ids.port_id);
2450         if (time_after(jiffies,
2451                        fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
2452                 fcoe_ctlr_vn_send_claim(fip);
2453 }
2454
2455 /**
2456  * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
2457  * @fip: The FCoE controller
2458  *
2459  * Called with ctlr_mutex held.
2460  * Called only in state FIP_ST_VNMP_UP.
2461  * Returns the soonest time for next age-out or a time far in the future.
2462  */
2463 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
2464 {
2465         struct fc_lport *lport = fip->lp;
2466         struct fc_rport_priv *rdata;
2467         struct fcoe_rport *frport;
2468         unsigned long next_time;
2469         unsigned long deadline;
2470
2471         next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
2472         mutex_lock(&lport->disc.disc_mutex);
2473         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
2474                 frport = fcoe_ctlr_rport(rdata);
2475                 if (!frport->time)
2476                         continue;
2477                 deadline = frport->time +
2478                            msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
2479                 if (time_after_eq(jiffies, deadline)) {
2480                         frport->time = 0;
2481                         LIBFCOE_FIP_DBG(fip,
2482                                 "port %16.16llx fc_id %6.6x beacon expired\n",
2483                                 rdata->ids.port_name, rdata->ids.port_id);
2484                         lport->tt.rport_logoff(rdata);
2485                 } else if (time_before(deadline, next_time))
2486                         next_time = deadline;
2487         }
2488         mutex_unlock(&lport->disc.disc_mutex);
2489         return next_time;
2490 }
2491
2492 /**
2493  * fcoe_ctlr_vn_recv() - Receive a FIP frame
2494  * @fip: The FCoE controller that received the frame
2495  * @skb: The received FIP frame
2496  *
2497  * Returns non-zero if the frame is dropped.
2498  * Always consumes the frame.
2499  */
2500 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2501 {
2502         struct fip_header *fiph;
2503         enum fip_vn2vn_subcode sub;
2504         struct {
2505                 struct fc_rport_priv rdata;
2506                 struct fcoe_rport frport;
2507         } buf;
2508         int rc;
2509
2510         fiph = (struct fip_header *)skb->data;
2511         sub = fiph->fip_subcode;
2512
2513         rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata);
2514         if (rc) {
2515                 LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
2516                 goto drop;
2517         }
2518
2519         mutex_lock(&fip->ctlr_mutex);
2520         switch (sub) {
2521         case FIP_SC_VN_PROBE_REQ:
2522                 fcoe_ctlr_vn_probe_req(fip, &buf.rdata);
2523                 break;
2524         case FIP_SC_VN_PROBE_REP:
2525                 fcoe_ctlr_vn_probe_reply(fip, &buf.rdata);
2526                 break;
2527         case FIP_SC_VN_CLAIM_NOTIFY:
2528                 fcoe_ctlr_vn_claim_notify(fip, &buf.rdata);
2529                 break;
2530         case FIP_SC_VN_CLAIM_REP:
2531                 fcoe_ctlr_vn_claim_resp(fip, &buf.rdata);
2532                 break;
2533         case FIP_SC_VN_BEACON:
2534                 fcoe_ctlr_vn_beacon(fip, &buf.rdata);
2535                 break;
2536         default:
2537                 LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
2538                 rc = -1;
2539                 break;
2540         }
2541         mutex_unlock(&fip->ctlr_mutex);
2542 drop:
2543         kfree_skb(skb);
2544         return rc;
2545 }
2546
2547 /**
2548  * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
2549  * @lport: The local port
2550  * @fp: The received frame
2551  *
2552  * This should never be called since we don't see RSCNs or other
2553  * fabric-generated ELSes.
2554  */
2555 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
2556 {
2557         struct fc_seq_els_data rjt_data;
2558
2559         rjt_data.reason = ELS_RJT_UNSUP;
2560         rjt_data.explan = ELS_EXPL_NONE;
2561         lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
2562         fc_frame_free(fp);
2563 }
2564
2565 /**
2566  * fcoe_ctlr_disc_recv - start discovery for VN2VN mode.
2567  * @fip: The FCoE controller
2568  *
2569  * This sets a flag indicating that remote ports should be created
2570  * and started for the peers we discover.  We use the disc_callback
2571  * pointer as that flag.  Peers already discovered are created here.
2572  *
2573  * The lport lock is held during this call. The callback must be done
2574  * later, without holding either the lport or discovery locks.
2575  * The fcoe_ctlr lock may also be held during this call.
2576  */
2577 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
2578                                                   enum fc_disc_event),
2579                                  struct fc_lport *lport)
2580 {
2581         struct fc_disc *disc = &lport->disc;
2582         struct fcoe_ctlr *fip = disc->priv;
2583
2584         mutex_lock(&disc->disc_mutex);
2585         disc->disc_callback = callback;
2586         disc->disc_id = (disc->disc_id + 2) | 1;
2587         disc->pending = 1;
2588         schedule_work(&fip->timer_work);
2589         mutex_unlock(&disc->disc_mutex);
2590 }
2591
2592 /**
2593  * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
2594  * @fip: The FCoE controller
2595  *
2596  * Starts the FLOGI and PLOGI login process to each discovered rport for which
2597  * we've received at least one beacon.
2598  * Performs the discovery complete callback.
2599  */
2600 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
2601 {
2602         struct fc_lport *lport = fip->lp;
2603         struct fc_disc *disc = &lport->disc;
2604         struct fc_rport_priv *rdata;
2605         struct fcoe_rport *frport;
2606         void (*callback)(struct fc_lport *, enum fc_disc_event);
2607
2608         mutex_lock(&disc->disc_mutex);
2609         callback = disc->pending ? disc->disc_callback : NULL;
2610         disc->pending = 0;
2611         list_for_each_entry_rcu(rdata, &disc->rports, peers) {
2612                 frport = fcoe_ctlr_rport(rdata);
2613                 if (frport->time)
2614                         lport->tt.rport_login(rdata);
2615         }
2616         mutex_unlock(&disc->disc_mutex);
2617         if (callback)
2618                 callback(lport, DISC_EV_SUCCESS);
2619 }
2620
2621 /**
2622  * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
2623  * @fip: The FCoE controller
2624  */
2625 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
2626 {
2627         unsigned long next_time;
2628         u8 mac[ETH_ALEN];
2629         u32 new_port_id = 0;
2630
2631         mutex_lock(&fip->ctlr_mutex);
2632         switch (fip->state) {
2633         case FIP_ST_VNMP_START:
2634                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
2635                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2636                 next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
2637                 break;
2638         case FIP_ST_VNMP_PROBE1:
2639                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
2640                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2641                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2642                 break;
2643         case FIP_ST_VNMP_PROBE2:
2644                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
2645                 new_port_id = fip->port_id;
2646                 hton24(mac, FIP_VN_FC_MAP);
2647                 hton24(mac + 3, new_port_id);
2648                 fcoe_ctlr_map_dest(fip);
2649                 fip->update_mac(fip->lp, mac);
2650                 fcoe_ctlr_vn_send_claim(fip);
2651                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2652                 break;
2653         case FIP_ST_VNMP_CLAIM:
2654                 /*
2655                  * This may be invoked either by starting discovery so don't
2656                  * go to the next state unless it's been long enough.
2657                  */
2658                 next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2659                 if (time_after_eq(jiffies, next_time)) {
2660                         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
2661                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2662                                           fcoe_all_vn2vn, 0);
2663                         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
2664                         fip->port_ka_time = next_time;
2665                 }
2666                 fcoe_ctlr_vn_disc(fip);
2667                 break;
2668         case FIP_ST_VNMP_UP:
2669                 next_time = fcoe_ctlr_vn_age(fip);
2670                 if (time_after_eq(jiffies, fip->port_ka_time)) {
2671                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
2672                                           fcoe_all_vn2vn, 0);
2673                         fip->port_ka_time = jiffies +
2674                                  msecs_to_jiffies(FIP_VN_BEACON_INT +
2675                                         (random32() % FIP_VN_BEACON_FUZZ));
2676                 }
2677                 if (time_before(fip->port_ka_time, next_time))
2678                         next_time = fip->port_ka_time;
2679                 break;
2680         case FIP_ST_LINK_WAIT:
2681                 goto unlock;
2682         default:
2683                 WARN(1, "unexpected state %d\n", fip->state);
2684                 goto unlock;
2685         }
2686         mod_timer(&fip->timer, next_time);
2687 unlock:
2688         mutex_unlock(&fip->ctlr_mutex);
2689
2690         /* If port ID is new, notify local port after dropping ctlr_mutex */
2691         if (new_port_id)
2692                 fc_lport_set_local_id(fip->lp, new_port_id);
2693 }
2694
2695 /**
2696  * fcoe_libfc_config() - Sets up libfc related properties for local port
2697  * @lp: The local port to configure libfc for
2698  * @fip: The FCoE controller in use by the local port
2699  * @tt: The libfc function template
2700  * @init_fcp: If non-zero, the FCP portion of libfc should be initialized
2701  *
2702  * Returns : 0 for success
2703  */
2704 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
2705                       const struct libfc_function_template *tt, int init_fcp)
2706 {
2707         /* Set the function pointers set by the LLDD */
2708         memcpy(&lport->tt, tt, sizeof(*tt));
2709         if (init_fcp && fc_fcp_init(lport))
2710                 return -ENOMEM;
2711         fc_exch_init(lport);
2712         fc_elsct_init(lport);
2713         fc_lport_init(lport);
2714         if (fip->mode == FIP_MODE_VN2VN)
2715                 lport->rport_priv_size = sizeof(struct fcoe_rport);
2716         fc_rport_init(lport);
2717         if (fip->mode == FIP_MODE_VN2VN) {
2718                 lport->point_to_multipoint = 1;
2719                 lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
2720                 lport->tt.disc_start = fcoe_ctlr_disc_start;
2721                 lport->tt.disc_stop = fcoe_ctlr_disc_stop;
2722                 lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
2723                 mutex_init(&lport->disc.disc_mutex);
2724                 INIT_LIST_HEAD(&lport->disc.rports);
2725                 lport->disc.priv = fip;
2726         } else {
2727                 fc_disc_init(lport);
2728         }
2729         return 0;
2730 }
2731 EXPORT_SYMBOL_GPL(fcoe_libfc_config);