xref: /openbmc/linux/drivers/scsi/fnic/fnic_fcs.c (revision f5ad1c74)
1 /*
2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
4  *
5  * This program is free software; you may redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; version 2 of the License.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16  * SOFTWARE.
17  */
18 #include <linux/errno.h>
19 #include <linux/pci.h>
20 #include <linux/slab.h>
21 #include <linux/skbuff.h>
22 #include <linux/interrupt.h>
23 #include <linux/spinlock.h>
24 #include <linux/if_ether.h>
25 #include <linux/if_vlan.h>
26 #include <linux/workqueue.h>
27 #include <scsi/fc/fc_fip.h>
28 #include <scsi/fc/fc_els.h>
29 #include <scsi/fc/fc_fcoe.h>
30 #include <scsi/fc_frame.h>
31 #include <scsi/libfc.h>
32 #include "fnic_io.h"
33 #include "fnic.h"
34 #include "fnic_fip.h"
35 #include "cq_enet_desc.h"
36 #include "cq_exch_desc.h"
37 
38 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
39 struct workqueue_struct *fnic_fip_queue;
40 struct workqueue_struct *fnic_event_queue;
41 
42 static void fnic_set_eth_mode(struct fnic *);
43 static void fnic_fcoe_send_vlan_req(struct fnic *fnic);
44 static void fnic_fcoe_start_fcf_disc(struct fnic *fnic);
45 static void fnic_fcoe_process_vlan_resp(struct fnic *fnic, struct sk_buff *);
46 static int fnic_fcoe_vlan_check(struct fnic *fnic, u16 flag);
47 static int fnic_fcoe_handle_fip_frame(struct fnic *fnic, struct sk_buff *skb);
48 
49 void fnic_handle_link(struct work_struct *work)
50 {
51 	struct fnic *fnic = container_of(work, struct fnic, link_work);
52 	unsigned long flags;
53 	int old_link_status;
54 	u32 old_link_down_cnt;
55 	u64 old_port_speed, new_port_speed;
56 
57 	spin_lock_irqsave(&fnic->fnic_lock, flags);
58 
59 	if (fnic->stop_rx_link_events) {
60 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
61 		return;
62 	}
63 
64 	old_link_down_cnt = fnic->link_down_cnt;
65 	old_link_status = fnic->link_status;
66 	old_port_speed = atomic64_read(
67 			&fnic->fnic_stats.misc_stats.current_port_speed);
68 
69 	fnic->link_status = vnic_dev_link_status(fnic->vdev);
70 	fnic->link_down_cnt = vnic_dev_link_down_cnt(fnic->vdev);
71 
72 	new_port_speed = vnic_dev_port_speed(fnic->vdev);
73 	atomic64_set(&fnic->fnic_stats.misc_stats.current_port_speed,
74 			new_port_speed);
75 	if (old_port_speed != new_port_speed)
76 		shost_printk(KERN_INFO, fnic->lport->host,
77 				"Current vnic speed set to :  %llu\n",
78 				new_port_speed);
79 
80 	switch (vnic_dev_port_speed(fnic->vdev)) {
81 	case DCEM_PORTSPEED_10G:
82 		fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_10GBIT;
83 		fnic->lport->link_supported_speeds = FC_PORTSPEED_10GBIT;
84 		break;
85 	case DCEM_PORTSPEED_20G:
86 		fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_20GBIT;
87 		fnic->lport->link_supported_speeds = FC_PORTSPEED_20GBIT;
88 		break;
89 	case DCEM_PORTSPEED_25G:
90 		fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_25GBIT;
91 		fnic->lport->link_supported_speeds = FC_PORTSPEED_25GBIT;
92 		break;
93 	case DCEM_PORTSPEED_40G:
94 	case DCEM_PORTSPEED_4x10G:
95 		fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_40GBIT;
96 		fnic->lport->link_supported_speeds = FC_PORTSPEED_40GBIT;
97 		break;
98 	case DCEM_PORTSPEED_100G:
99 		fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_100GBIT;
100 		fnic->lport->link_supported_speeds = FC_PORTSPEED_100GBIT;
101 		break;
102 	default:
103 		fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_UNKNOWN;
104 		fnic->lport->link_supported_speeds = FC_PORTSPEED_UNKNOWN;
105 		break;
106 	}
107 
108 	if (old_link_status == fnic->link_status) {
109 		if (!fnic->link_status) {
110 			/* DOWN -> DOWN */
111 			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
112 			fnic_fc_trace_set_data(fnic->lport->host->host_no,
113 				FNIC_FC_LE, "Link Status: DOWN->DOWN",
114 				strlen("Link Status: DOWN->DOWN"));
115 		} else {
116 			if (old_link_down_cnt != fnic->link_down_cnt) {
117 				/* UP -> DOWN -> UP */
118 				fnic->lport->host_stats.link_failure_count++;
119 				spin_unlock_irqrestore(&fnic->fnic_lock, flags);
120 				fnic_fc_trace_set_data(
121 					fnic->lport->host->host_no,
122 					FNIC_FC_LE,
123 					"Link Status:UP_DOWN_UP",
124 					strlen("Link_Status:UP_DOWN_UP")
125 					);
126 				FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
127 					     "link down\n");
128 				fcoe_ctlr_link_down(&fnic->ctlr);
129 				if (fnic->config.flags & VFCF_FIP_CAPABLE) {
130 					/* start FCoE VLAN discovery */
131 					fnic_fc_trace_set_data(
132 						fnic->lport->host->host_no,
133 						FNIC_FC_LE,
134 						"Link Status: UP_DOWN_UP_VLAN",
135 						strlen(
136 						"Link Status: UP_DOWN_UP_VLAN")
137 						);
138 					fnic_fcoe_send_vlan_req(fnic);
139 					return;
140 				}
141 				FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
142 					     "link up\n");
143 				fcoe_ctlr_link_up(&fnic->ctlr);
144 			} else {
145 				/* UP -> UP */
146 				spin_unlock_irqrestore(&fnic->fnic_lock, flags);
147 				fnic_fc_trace_set_data(
148 					fnic->lport->host->host_no, FNIC_FC_LE,
149 					"Link Status: UP_UP",
150 					strlen("Link Status: UP_UP"));
151 			}
152 		}
153 	} else if (fnic->link_status) {
154 		/* DOWN -> UP */
155 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
156 		if (fnic->config.flags & VFCF_FIP_CAPABLE) {
157 			/* start FCoE VLAN discovery */
158 				fnic_fc_trace_set_data(
159 				fnic->lport->host->host_no,
160 				FNIC_FC_LE, "Link Status: DOWN_UP_VLAN",
161 				strlen("Link Status: DOWN_UP_VLAN"));
162 			fnic_fcoe_send_vlan_req(fnic);
163 			return;
164 		}
165 		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link up\n");
166 		fnic_fc_trace_set_data(fnic->lport->host->host_no, FNIC_FC_LE,
167 			"Link Status: DOWN_UP", strlen("Link Status: DOWN_UP"));
168 		fcoe_ctlr_link_up(&fnic->ctlr);
169 	} else {
170 		/* UP -> DOWN */
171 		fnic->lport->host_stats.link_failure_count++;
172 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
173 		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link down\n");
174 		fnic_fc_trace_set_data(
175 			fnic->lport->host->host_no, FNIC_FC_LE,
176 			"Link Status: UP_DOWN",
177 			strlen("Link Status: UP_DOWN"));
178 		if (fnic->config.flags & VFCF_FIP_CAPABLE) {
179 			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
180 				"deleting fip-timer during link-down\n");
181 			del_timer_sync(&fnic->fip_timer);
182 		}
183 		fcoe_ctlr_link_down(&fnic->ctlr);
184 	}
185 
186 }
187 
188 /*
189  * This function passes incoming fabric frames to libFC
190  */
191 void fnic_handle_frame(struct work_struct *work)
192 {
193 	struct fnic *fnic = container_of(work, struct fnic, frame_work);
194 	struct fc_lport *lp = fnic->lport;
195 	unsigned long flags;
196 	struct sk_buff *skb;
197 	struct fc_frame *fp;
198 
199 	while ((skb = skb_dequeue(&fnic->frame_queue))) {
200 
201 		spin_lock_irqsave(&fnic->fnic_lock, flags);
202 		if (fnic->stop_rx_link_events) {
203 			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
204 			dev_kfree_skb(skb);
205 			return;
206 		}
207 		fp = (struct fc_frame *)skb;
208 
209 		/*
210 		 * If we're in a transitional state, just re-queue and return.
211 		 * The queue will be serviced when we get to a stable state.
212 		 */
213 		if (fnic->state != FNIC_IN_FC_MODE &&
214 		    fnic->state != FNIC_IN_ETH_MODE) {
215 			skb_queue_head(&fnic->frame_queue, skb);
216 			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
217 			return;
218 		}
219 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
220 
221 		fc_exch_recv(lp, fp);
222 	}
223 }
224 
225 void fnic_fcoe_evlist_free(struct fnic *fnic)
226 {
227 	struct fnic_event *fevt = NULL;
228 	struct fnic_event *next = NULL;
229 	unsigned long flags;
230 
231 	spin_lock_irqsave(&fnic->fnic_lock, flags);
232 	if (list_empty(&fnic->evlist)) {
233 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
234 		return;
235 	}
236 
237 	list_for_each_entry_safe(fevt, next, &fnic->evlist, list) {
238 		list_del(&fevt->list);
239 		kfree(fevt);
240 	}
241 	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
242 }
243 
244 void fnic_handle_event(struct work_struct *work)
245 {
246 	struct fnic *fnic = container_of(work, struct fnic, event_work);
247 	struct fnic_event *fevt = NULL;
248 	struct fnic_event *next = NULL;
249 	unsigned long flags;
250 
251 	spin_lock_irqsave(&fnic->fnic_lock, flags);
252 	if (list_empty(&fnic->evlist)) {
253 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
254 		return;
255 	}
256 
257 	list_for_each_entry_safe(fevt, next, &fnic->evlist, list) {
258 		if (fnic->stop_rx_link_events) {
259 			list_del(&fevt->list);
260 			kfree(fevt);
261 			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
262 			return;
263 		}
264 		/*
265 		 * If we're in a transitional state, just re-queue and return.
266 		 * The queue will be serviced when we get to a stable state.
267 		 */
268 		if (fnic->state != FNIC_IN_FC_MODE &&
269 		    fnic->state != FNIC_IN_ETH_MODE) {
270 			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
271 			return;
272 		}
273 
274 		list_del(&fevt->list);
275 		switch (fevt->event) {
276 		case FNIC_EVT_START_VLAN_DISC:
277 			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
278 			fnic_fcoe_send_vlan_req(fnic);
279 			spin_lock_irqsave(&fnic->fnic_lock, flags);
280 			break;
281 		case FNIC_EVT_START_FCF_DISC:
282 			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
283 				  "Start FCF Discovery\n");
284 			fnic_fcoe_start_fcf_disc(fnic);
285 			break;
286 		default:
287 			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
288 				  "Unknown event 0x%x\n", fevt->event);
289 			break;
290 		}
291 		kfree(fevt);
292 	}
293 	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
294 }
295 
296 /**
297  * Check if the Received FIP FLOGI frame is rejected
298  * @fip: The FCoE controller that received the frame
299  * @skb: The received FIP frame
300  *
301  * Returns non-zero if the frame is rejected with unsupported cmd with
302  * insufficient resource els explanation.
303  */
304 static inline int is_fnic_fip_flogi_reject(struct fcoe_ctlr *fip,
305 					 struct sk_buff *skb)
306 {
307 	struct fc_lport *lport = fip->lp;
308 	struct fip_header *fiph;
309 	struct fc_frame_header *fh = NULL;
310 	struct fip_desc *desc;
311 	struct fip_encaps *els;
312 	u16 op;
313 	u8 els_op;
314 	u8 sub;
315 
316 	size_t rlen;
317 	size_t dlen = 0;
318 
319 	if (skb_linearize(skb))
320 		return 0;
321 
322 	if (skb->len < sizeof(*fiph))
323 		return 0;
324 
325 	fiph = (struct fip_header *)skb->data;
326 	op = ntohs(fiph->fip_op);
327 	sub = fiph->fip_subcode;
328 
329 	if (op != FIP_OP_LS)
330 		return 0;
331 
332 	if (sub != FIP_SC_REP)
333 		return 0;
334 
335 	rlen = ntohs(fiph->fip_dl_len) * 4;
336 	if (rlen + sizeof(*fiph) > skb->len)
337 		return 0;
338 
339 	desc = (struct fip_desc *)(fiph + 1);
340 	dlen = desc->fip_dlen * FIP_BPW;
341 
342 	if (desc->fip_dtype == FIP_DT_FLOGI) {
343 
344 		if (dlen < sizeof(*els) + sizeof(*fh) + 1)
345 			return 0;
346 
347 		els = (struct fip_encaps *)desc;
348 		fh = (struct fc_frame_header *)(els + 1);
349 
350 		if (!fh)
351 			return 0;
352 
353 		/*
354 		 * ELS command code, reason and explanation should be = Reject,
355 		 * unsupported command and insufficient resource
356 		 */
357 		els_op = *(u8 *)(fh + 1);
358 		if (els_op == ELS_LS_RJT) {
359 			shost_printk(KERN_INFO, lport->host,
360 				  "Flogi Request Rejected by Switch\n");
361 			return 1;
362 		}
363 		shost_printk(KERN_INFO, lport->host,
364 				"Flogi Request Accepted by Switch\n");
365 	}
366 	return 0;
367 }
368 
369 static void fnic_fcoe_send_vlan_req(struct fnic *fnic)
370 {
371 	struct fcoe_ctlr *fip = &fnic->ctlr;
372 	struct fnic_stats *fnic_stats = &fnic->fnic_stats;
373 	struct sk_buff *skb;
374 	char *eth_fr;
375 	struct fip_vlan *vlan;
376 	u64 vlan_tov;
377 
378 	fnic_fcoe_reset_vlans(fnic);
379 	fnic->set_vlan(fnic, 0);
380 
381 	if (printk_ratelimit())
382 		FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
383 			  "Sending VLAN request...\n");
384 
385 	skb = dev_alloc_skb(sizeof(struct fip_vlan));
386 	if (!skb)
387 		return;
388 
389 	eth_fr = (char *)skb->data;
390 	vlan = (struct fip_vlan *)eth_fr;
391 
392 	memset(vlan, 0, sizeof(*vlan));
393 	memcpy(vlan->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
394 	memcpy(vlan->eth.h_dest, fcoe_all_fcfs, ETH_ALEN);
395 	vlan->eth.h_proto = htons(ETH_P_FIP);
396 
397 	vlan->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
398 	vlan->fip.fip_op = htons(FIP_OP_VLAN);
399 	vlan->fip.fip_subcode = FIP_SC_VL_REQ;
400 	vlan->fip.fip_dl_len = htons(sizeof(vlan->desc) / FIP_BPW);
401 
402 	vlan->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
403 	vlan->desc.mac.fd_desc.fip_dlen = sizeof(vlan->desc.mac) / FIP_BPW;
404 	memcpy(&vlan->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
405 
406 	vlan->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
407 	vlan->desc.wwnn.fd_desc.fip_dlen = sizeof(vlan->desc.wwnn) / FIP_BPW;
408 	put_unaligned_be64(fip->lp->wwnn, &vlan->desc.wwnn.fd_wwn);
409 	atomic64_inc(&fnic_stats->vlan_stats.vlan_disc_reqs);
410 
411 	skb_put(skb, sizeof(*vlan));
412 	skb->protocol = htons(ETH_P_FIP);
413 	skb_reset_mac_header(skb);
414 	skb_reset_network_header(skb);
415 	fip->send(fip, skb);
416 
417 	/* set a timer so that we can retry if there no response */
418 	vlan_tov = jiffies + msecs_to_jiffies(FCOE_CTLR_FIPVLAN_TOV);
419 	mod_timer(&fnic->fip_timer, round_jiffies(vlan_tov));
420 }
421 
422 static void fnic_fcoe_process_vlan_resp(struct fnic *fnic, struct sk_buff *skb)
423 {
424 	struct fcoe_ctlr *fip = &fnic->ctlr;
425 	struct fip_header *fiph;
426 	struct fip_desc *desc;
427 	struct fnic_stats *fnic_stats = &fnic->fnic_stats;
428 	u16 vid;
429 	size_t rlen;
430 	size_t dlen;
431 	struct fcoe_vlan *vlan;
432 	u64 sol_time;
433 	unsigned long flags;
434 
435 	FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
436 		  "Received VLAN response...\n");
437 
438 	fiph = (struct fip_header *) skb->data;
439 
440 	FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
441 		  "Received VLAN response... OP 0x%x SUB_OP 0x%x\n",
442 		  ntohs(fiph->fip_op), fiph->fip_subcode);
443 
444 	rlen = ntohs(fiph->fip_dl_len) * 4;
445 	fnic_fcoe_reset_vlans(fnic);
446 	spin_lock_irqsave(&fnic->vlans_lock, flags);
447 	desc = (struct fip_desc *)(fiph + 1);
448 	while (rlen > 0) {
449 		dlen = desc->fip_dlen * FIP_BPW;
450 		switch (desc->fip_dtype) {
451 		case FIP_DT_VLAN:
452 			vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan);
453 			shost_printk(KERN_INFO, fnic->lport->host,
454 				  "process_vlan_resp: FIP VLAN %d\n", vid);
455 			vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
456 			if (!vlan) {
457 				/* retry from timer */
458 				spin_unlock_irqrestore(&fnic->vlans_lock,
459 							flags);
460 				goto out;
461 			}
462 			vlan->vid = vid & 0x0fff;
463 			vlan->state = FIP_VLAN_AVAIL;
464 			list_add_tail(&vlan->list, &fnic->vlans);
465 			break;
466 		}
467 		desc = (struct fip_desc *)((char *)desc + dlen);
468 		rlen -= dlen;
469 	}
470 
471 	/* any VLAN descriptors present ? */
472 	if (list_empty(&fnic->vlans)) {
473 		/* retry from timer */
474 		atomic64_inc(&fnic_stats->vlan_stats.resp_withno_vlanID);
475 		FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
476 			  "No VLAN descriptors in FIP VLAN response\n");
477 		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
478 		goto out;
479 	}
480 
481 	vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
482 	fnic->set_vlan(fnic, vlan->vid);
483 	vlan->state = FIP_VLAN_SENT; /* sent now */
484 	vlan->sol_count++;
485 	spin_unlock_irqrestore(&fnic->vlans_lock, flags);
486 
487 	/* start the solicitation */
488 	fcoe_ctlr_link_up(fip);
489 
490 	sol_time = jiffies + msecs_to_jiffies(FCOE_CTLR_START_DELAY);
491 	mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
492 out:
493 	return;
494 }
495 
496 static void fnic_fcoe_start_fcf_disc(struct fnic *fnic)
497 {
498 	unsigned long flags;
499 	struct fcoe_vlan *vlan;
500 	u64 sol_time;
501 
502 	spin_lock_irqsave(&fnic->vlans_lock, flags);
503 	vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
504 	fnic->set_vlan(fnic, vlan->vid);
505 	vlan->state = FIP_VLAN_SENT; /* sent now */
506 	vlan->sol_count = 1;
507 	spin_unlock_irqrestore(&fnic->vlans_lock, flags);
508 
509 	/* start the solicitation */
510 	fcoe_ctlr_link_up(&fnic->ctlr);
511 
512 	sol_time = jiffies + msecs_to_jiffies(FCOE_CTLR_START_DELAY);
513 	mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
514 }
515 
516 static int fnic_fcoe_vlan_check(struct fnic *fnic, u16 flag)
517 {
518 	unsigned long flags;
519 	struct fcoe_vlan *fvlan;
520 
521 	spin_lock_irqsave(&fnic->vlans_lock, flags);
522 	if (list_empty(&fnic->vlans)) {
523 		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
524 		return -EINVAL;
525 	}
526 
527 	fvlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
528 	if (fvlan->state == FIP_VLAN_USED) {
529 		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
530 		return 0;
531 	}
532 
533 	if (fvlan->state == FIP_VLAN_SENT) {
534 		fvlan->state = FIP_VLAN_USED;
535 		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
536 		return 0;
537 	}
538 	spin_unlock_irqrestore(&fnic->vlans_lock, flags);
539 	return -EINVAL;
540 }
541 
542 static void fnic_event_enq(struct fnic *fnic, enum fnic_evt ev)
543 {
544 	struct fnic_event *fevt;
545 	unsigned long flags;
546 
547 	fevt = kmalloc(sizeof(*fevt), GFP_ATOMIC);
548 	if (!fevt)
549 		return;
550 
551 	fevt->fnic = fnic;
552 	fevt->event = ev;
553 
554 	spin_lock_irqsave(&fnic->fnic_lock, flags);
555 	list_add_tail(&fevt->list, &fnic->evlist);
556 	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
557 
558 	schedule_work(&fnic->event_work);
559 }
560 
561 static int fnic_fcoe_handle_fip_frame(struct fnic *fnic, struct sk_buff *skb)
562 {
563 	struct fip_header *fiph;
564 	int ret = 1;
565 	u16 op;
566 	u8 sub;
567 
568 	if (!skb || !(skb->data))
569 		return -1;
570 
571 	if (skb_linearize(skb))
572 		goto drop;
573 
574 	fiph = (struct fip_header *)skb->data;
575 	op = ntohs(fiph->fip_op);
576 	sub = fiph->fip_subcode;
577 
578 	if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
579 		goto drop;
580 
581 	if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
582 		goto drop;
583 
584 	if (op == FIP_OP_DISC && sub == FIP_SC_ADV) {
585 		if (fnic_fcoe_vlan_check(fnic, ntohs(fiph->fip_flags)))
586 			goto drop;
587 		/* pass it on to fcoe */
588 		ret = 1;
589 	} else if (op == FIP_OP_VLAN && sub == FIP_SC_VL_NOTE) {
590 		/* set the vlan as used */
591 		fnic_fcoe_process_vlan_resp(fnic, skb);
592 		ret = 0;
593 	} else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) {
594 		/* received CVL request, restart vlan disc */
595 		fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
596 		/* pass it on to fcoe */
597 		ret = 1;
598 	}
599 drop:
600 	return ret;
601 }
602 
603 void fnic_handle_fip_frame(struct work_struct *work)
604 {
605 	struct fnic *fnic = container_of(work, struct fnic, fip_frame_work);
606 	struct fnic_stats *fnic_stats = &fnic->fnic_stats;
607 	unsigned long flags;
608 	struct sk_buff *skb;
609 	struct ethhdr *eh;
610 
611 	while ((skb = skb_dequeue(&fnic->fip_frame_queue))) {
612 		spin_lock_irqsave(&fnic->fnic_lock, flags);
613 		if (fnic->stop_rx_link_events) {
614 			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
615 			dev_kfree_skb(skb);
616 			return;
617 		}
618 		/*
619 		 * If we're in a transitional state, just re-queue and return.
620 		 * The queue will be serviced when we get to a stable state.
621 		 */
622 		if (fnic->state != FNIC_IN_FC_MODE &&
623 		    fnic->state != FNIC_IN_ETH_MODE) {
624 			skb_queue_head(&fnic->fip_frame_queue, skb);
625 			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
626 			return;
627 		}
628 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
629 		eh = (struct ethhdr *)skb->data;
630 		if (eh->h_proto == htons(ETH_P_FIP)) {
631 			skb_pull(skb, sizeof(*eh));
632 			if (fnic_fcoe_handle_fip_frame(fnic, skb) <= 0) {
633 				dev_kfree_skb(skb);
634 				continue;
635 			}
636 			/*
637 			 * If there's FLOGI rejects - clear all
638 			 * fcf's & restart from scratch
639 			 */
640 			if (is_fnic_fip_flogi_reject(&fnic->ctlr, skb)) {
641 				atomic64_inc(
642 					&fnic_stats->vlan_stats.flogi_rejects);
643 				shost_printk(KERN_INFO, fnic->lport->host,
644 					  "Trigger a Link down - VLAN Disc\n");
645 				fcoe_ctlr_link_down(&fnic->ctlr);
646 				/* start FCoE VLAN discovery */
647 				fnic_fcoe_send_vlan_req(fnic);
648 				dev_kfree_skb(skb);
649 				continue;
650 			}
651 			fcoe_ctlr_recv(&fnic->ctlr, skb);
652 			continue;
653 		}
654 	}
655 }
656 
657 /**
658  * fnic_import_rq_eth_pkt() - handle received FCoE or FIP frame.
659  * @fnic:	fnic instance.
660  * @skb:	Ethernet Frame.
661  */
662 static inline int fnic_import_rq_eth_pkt(struct fnic *fnic, struct sk_buff *skb)
663 {
664 	struct fc_frame *fp;
665 	struct ethhdr *eh;
666 	struct fcoe_hdr *fcoe_hdr;
667 	struct fcoe_crc_eof *ft;
668 
669 	/*
670 	 * Undo VLAN encapsulation if present.
671 	 */
672 	eh = (struct ethhdr *)skb->data;
673 	if (eh->h_proto == htons(ETH_P_8021Q)) {
674 		memmove((u8 *)eh + VLAN_HLEN, eh, ETH_ALEN * 2);
675 		eh = skb_pull(skb, VLAN_HLEN);
676 		skb_reset_mac_header(skb);
677 	}
678 	if (eh->h_proto == htons(ETH_P_FIP)) {
679 		if (!(fnic->config.flags & VFCF_FIP_CAPABLE)) {
680 			printk(KERN_ERR "Dropped FIP frame, as firmware "
681 					"uses non-FIP mode, Enable FIP "
682 					"using UCSM\n");
683 			goto drop;
684 		}
685 		if ((fnic_fc_trace_set_data(fnic->lport->host->host_no,
686 			FNIC_FC_RECV|0x80, (char *)skb->data, skb->len)) != 0) {
687 			printk(KERN_ERR "fnic ctlr frame trace error!!!");
688 		}
689 		skb_queue_tail(&fnic->fip_frame_queue, skb);
690 		queue_work(fnic_fip_queue, &fnic->fip_frame_work);
691 		return 1;		/* let caller know packet was used */
692 	}
693 	if (eh->h_proto != htons(ETH_P_FCOE))
694 		goto drop;
695 	skb_set_network_header(skb, sizeof(*eh));
696 	skb_pull(skb, sizeof(*eh));
697 
698 	fcoe_hdr = (struct fcoe_hdr *)skb->data;
699 	if (FC_FCOE_DECAPS_VER(fcoe_hdr) != FC_FCOE_VER)
700 		goto drop;
701 
702 	fp = (struct fc_frame *)skb;
703 	fc_frame_init(fp);
704 	fr_sof(fp) = fcoe_hdr->fcoe_sof;
705 	skb_pull(skb, sizeof(struct fcoe_hdr));
706 	skb_reset_transport_header(skb);
707 
708 	ft = (struct fcoe_crc_eof *)(skb->data + skb->len - sizeof(*ft));
709 	fr_eof(fp) = ft->fcoe_eof;
710 	skb_trim(skb, skb->len - sizeof(*ft));
711 	return 0;
712 drop:
713 	dev_kfree_skb_irq(skb);
714 	return -1;
715 }
716 
717 /**
718  * fnic_update_mac_locked() - set data MAC address and filters.
719  * @fnic:	fnic instance.
720  * @new:	newly-assigned FCoE MAC address.
721  *
722  * Called with the fnic lock held.
723  */
724 void fnic_update_mac_locked(struct fnic *fnic, u8 *new)
725 {
726 	u8 *ctl = fnic->ctlr.ctl_src_addr;
727 	u8 *data = fnic->data_src_addr;
728 
729 	if (is_zero_ether_addr(new))
730 		new = ctl;
731 	if (ether_addr_equal(data, new))
732 		return;
733 	FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "update_mac %pM\n", new);
734 	if (!is_zero_ether_addr(data) && !ether_addr_equal(data, ctl))
735 		vnic_dev_del_addr(fnic->vdev, data);
736 	memcpy(data, new, ETH_ALEN);
737 	if (!ether_addr_equal(new, ctl))
738 		vnic_dev_add_addr(fnic->vdev, new);
739 }
740 
741 /**
742  * fnic_update_mac() - set data MAC address and filters.
743  * @lport:	local port.
744  * @new:	newly-assigned FCoE MAC address.
745  */
746 void fnic_update_mac(struct fc_lport *lport, u8 *new)
747 {
748 	struct fnic *fnic = lport_priv(lport);
749 
750 	spin_lock_irq(&fnic->fnic_lock);
751 	fnic_update_mac_locked(fnic, new);
752 	spin_unlock_irq(&fnic->fnic_lock);
753 }
754 
755 /**
756  * fnic_set_port_id() - set the port_ID after successful FLOGI.
757  * @lport:	local port.
758  * @port_id:	assigned FC_ID.
759  * @fp:		received frame containing the FLOGI accept or NULL.
760  *
761  * This is called from libfc when a new FC_ID has been assigned.
762  * This causes us to reset the firmware to FC_MODE and setup the new MAC
763  * address and FC_ID.
764  *
765  * It is also called with FC_ID 0 when we're logged off.
766  *
767  * If the FC_ID is due to point-to-point, fp may be NULL.
768  */
769 void fnic_set_port_id(struct fc_lport *lport, u32 port_id, struct fc_frame *fp)
770 {
771 	struct fnic *fnic = lport_priv(lport);
772 	u8 *mac;
773 	int ret;
774 
775 	FNIC_FCS_DBG(KERN_DEBUG, lport->host, "set port_id %x fp %p\n",
776 		     port_id, fp);
777 
778 	/*
779 	 * If we're clearing the FC_ID, change to use the ctl_src_addr.
780 	 * Set ethernet mode to send FLOGI.
781 	 */
782 	if (!port_id) {
783 		fnic_update_mac(lport, fnic->ctlr.ctl_src_addr);
784 		fnic_set_eth_mode(fnic);
785 		return;
786 	}
787 
788 	if (fp) {
789 		mac = fr_cb(fp)->granted_mac;
790 		if (is_zero_ether_addr(mac)) {
791 			/* non-FIP - FLOGI already accepted - ignore return */
792 			fcoe_ctlr_recv_flogi(&fnic->ctlr, lport, fp);
793 		}
794 		fnic_update_mac(lport, mac);
795 	}
796 
797 	/* Change state to reflect transition to FC mode */
798 	spin_lock_irq(&fnic->fnic_lock);
799 	if (fnic->state == FNIC_IN_ETH_MODE || fnic->state == FNIC_IN_FC_MODE)
800 		fnic->state = FNIC_IN_ETH_TRANS_FC_MODE;
801 	else {
802 		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
803 			     "Unexpected fnic state %s while"
804 			     " processing flogi resp\n",
805 			     fnic_state_to_str(fnic->state));
806 		spin_unlock_irq(&fnic->fnic_lock);
807 		return;
808 	}
809 	spin_unlock_irq(&fnic->fnic_lock);
810 
811 	/*
812 	 * Send FLOGI registration to firmware to set up FC mode.
813 	 * The new address will be set up when registration completes.
814 	 */
815 	ret = fnic_flogi_reg_handler(fnic, port_id);
816 
817 	if (ret < 0) {
818 		spin_lock_irq(&fnic->fnic_lock);
819 		if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE)
820 			fnic->state = FNIC_IN_ETH_MODE;
821 		spin_unlock_irq(&fnic->fnic_lock);
822 	}
823 }
824 
825 static void fnic_rq_cmpl_frame_recv(struct vnic_rq *rq, struct cq_desc
826 				    *cq_desc, struct vnic_rq_buf *buf,
827 				    int skipped __attribute__((unused)),
828 				    void *opaque)
829 {
830 	struct fnic *fnic = vnic_dev_priv(rq->vdev);
831 	struct sk_buff *skb;
832 	struct fc_frame *fp;
833 	struct fnic_stats *fnic_stats = &fnic->fnic_stats;
834 	u8 type, color, eop, sop, ingress_port, vlan_stripped;
835 	u8 fcoe = 0, fcoe_sof, fcoe_eof;
836 	u8 fcoe_fc_crc_ok = 1, fcoe_enc_error = 0;
837 	u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
838 	u8 ipv6, ipv4, ipv4_fragment, rss_type, csum_not_calc;
839 	u8 fcs_ok = 1, packet_error = 0;
840 	u16 q_number, completed_index, bytes_written = 0, vlan, checksum;
841 	u32 rss_hash;
842 	u16 exchange_id, tmpl;
843 	u8 sof = 0;
844 	u8 eof = 0;
845 	u32 fcp_bytes_written = 0;
846 	unsigned long flags;
847 
848 	dma_unmap_single(&fnic->pdev->dev, buf->dma_addr, buf->len,
849 			 DMA_FROM_DEVICE);
850 	skb = buf->os_buf;
851 	fp = (struct fc_frame *)skb;
852 	buf->os_buf = NULL;
853 
854 	cq_desc_dec(cq_desc, &type, &color, &q_number, &completed_index);
855 	if (type == CQ_DESC_TYPE_RQ_FCP) {
856 		cq_fcp_rq_desc_dec((struct cq_fcp_rq_desc *)cq_desc,
857 				   &type, &color, &q_number, &completed_index,
858 				   &eop, &sop, &fcoe_fc_crc_ok, &exchange_id,
859 				   &tmpl, &fcp_bytes_written, &sof, &eof,
860 				   &ingress_port, &packet_error,
861 				   &fcoe_enc_error, &fcs_ok, &vlan_stripped,
862 				   &vlan);
863 		skb_trim(skb, fcp_bytes_written);
864 		fr_sof(fp) = sof;
865 		fr_eof(fp) = eof;
866 
867 	} else if (type == CQ_DESC_TYPE_RQ_ENET) {
868 		cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
869 				    &type, &color, &q_number, &completed_index,
870 				    &ingress_port, &fcoe, &eop, &sop,
871 				    &rss_type, &csum_not_calc, &rss_hash,
872 				    &bytes_written, &packet_error,
873 				    &vlan_stripped, &vlan, &checksum,
874 				    &fcoe_sof, &fcoe_fc_crc_ok,
875 				    &fcoe_enc_error, &fcoe_eof,
876 				    &tcp_udp_csum_ok, &udp, &tcp,
877 				    &ipv4_csum_ok, &ipv6, &ipv4,
878 				    &ipv4_fragment, &fcs_ok);
879 		skb_trim(skb, bytes_written);
880 		if (!fcs_ok) {
881 			atomic64_inc(&fnic_stats->misc_stats.frame_errors);
882 			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
883 				     "fcs error.  dropping packet.\n");
884 			goto drop;
885 		}
886 		if (fnic_import_rq_eth_pkt(fnic, skb))
887 			return;
888 
889 	} else {
890 		/* wrong CQ type*/
891 		shost_printk(KERN_ERR, fnic->lport->host,
892 			     "fnic rq_cmpl wrong cq type x%x\n", type);
893 		goto drop;
894 	}
895 
896 	if (!fcs_ok || packet_error || !fcoe_fc_crc_ok || fcoe_enc_error) {
897 		atomic64_inc(&fnic_stats->misc_stats.frame_errors);
898 		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
899 			     "fnic rq_cmpl fcoe x%x fcsok x%x"
900 			     " pkterr x%x fcoe_fc_crc_ok x%x, fcoe_enc_err"
901 			     " x%x\n",
902 			     fcoe, fcs_ok, packet_error,
903 			     fcoe_fc_crc_ok, fcoe_enc_error);
904 		goto drop;
905 	}
906 
907 	spin_lock_irqsave(&fnic->fnic_lock, flags);
908 	if (fnic->stop_rx_link_events) {
909 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
910 		goto drop;
911 	}
912 	fr_dev(fp) = fnic->lport;
913 	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
914 	if ((fnic_fc_trace_set_data(fnic->lport->host->host_no, FNIC_FC_RECV,
915 					(char *)skb->data, skb->len)) != 0) {
916 		printk(KERN_ERR "fnic ctlr frame trace error!!!");
917 	}
918 
919 	skb_queue_tail(&fnic->frame_queue, skb);
920 	queue_work(fnic_event_queue, &fnic->frame_work);
921 
922 	return;
923 drop:
924 	dev_kfree_skb_irq(skb);
925 }
926 
927 static int fnic_rq_cmpl_handler_cont(struct vnic_dev *vdev,
928 				     struct cq_desc *cq_desc, u8 type,
929 				     u16 q_number, u16 completed_index,
930 				     void *opaque)
931 {
932 	struct fnic *fnic = vnic_dev_priv(vdev);
933 
934 	vnic_rq_service(&fnic->rq[q_number], cq_desc, completed_index,
935 			VNIC_RQ_RETURN_DESC, fnic_rq_cmpl_frame_recv,
936 			NULL);
937 	return 0;
938 }
939 
940 int fnic_rq_cmpl_handler(struct fnic *fnic, int rq_work_to_do)
941 {
942 	unsigned int tot_rq_work_done = 0, cur_work_done;
943 	unsigned int i;
944 	int err;
945 
946 	for (i = 0; i < fnic->rq_count; i++) {
947 		cur_work_done = vnic_cq_service(&fnic->cq[i], rq_work_to_do,
948 						fnic_rq_cmpl_handler_cont,
949 						NULL);
950 		if (cur_work_done) {
951 			err = vnic_rq_fill(&fnic->rq[i], fnic_alloc_rq_frame);
952 			if (err)
953 				shost_printk(KERN_ERR, fnic->lport->host,
954 					     "fnic_alloc_rq_frame can't alloc"
955 					     " frame\n");
956 		}
957 		tot_rq_work_done += cur_work_done;
958 	}
959 
960 	return tot_rq_work_done;
961 }
962 
963 /*
964  * This function is called once at init time to allocate and fill RQ
965  * buffers. Subsequently, it is called in the interrupt context after RQ
966  * buffer processing to replenish the buffers in the RQ
967  */
968 int fnic_alloc_rq_frame(struct vnic_rq *rq)
969 {
970 	struct fnic *fnic = vnic_dev_priv(rq->vdev);
971 	struct sk_buff *skb;
972 	u16 len;
973 	dma_addr_t pa;
974 	int r;
975 
976 	len = FC_FRAME_HEADROOM + FC_MAX_FRAME + FC_FRAME_TAILROOM;
977 	skb = dev_alloc_skb(len);
978 	if (!skb) {
979 		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
980 			     "Unable to allocate RQ sk_buff\n");
981 		return -ENOMEM;
982 	}
983 	skb_reset_mac_header(skb);
984 	skb_reset_transport_header(skb);
985 	skb_reset_network_header(skb);
986 	skb_put(skb, len);
987 	pa = dma_map_single(&fnic->pdev->dev, skb->data, len, DMA_FROM_DEVICE);
988 	if (dma_mapping_error(&fnic->pdev->dev, pa)) {
989 		r = -ENOMEM;
990 		printk(KERN_ERR "PCI mapping failed with error %d\n", r);
991 		goto free_skb;
992 	}
993 
994 	fnic_queue_rq_desc(rq, skb, pa, len);
995 	return 0;
996 
997 free_skb:
998 	kfree_skb(skb);
999 	return r;
1000 }
1001 
1002 void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
1003 {
1004 	struct fc_frame *fp = buf->os_buf;
1005 	struct fnic *fnic = vnic_dev_priv(rq->vdev);
1006 
1007 	dma_unmap_single(&fnic->pdev->dev, buf->dma_addr, buf->len,
1008 			 DMA_FROM_DEVICE);
1009 
1010 	dev_kfree_skb(fp_skb(fp));
1011 	buf->os_buf = NULL;
1012 }
1013 
1014 /**
1015  * fnic_eth_send() - Send Ethernet frame.
1016  * @fip:	fcoe_ctlr instance.
1017  * @skb:	Ethernet Frame, FIP, without VLAN encapsulation.
1018  */
1019 void fnic_eth_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
1020 {
1021 	struct fnic *fnic = fnic_from_ctlr(fip);
1022 	struct vnic_wq *wq = &fnic->wq[0];
1023 	dma_addr_t pa;
1024 	struct ethhdr *eth_hdr;
1025 	struct vlan_ethhdr *vlan_hdr;
1026 	unsigned long flags;
1027 
1028 	if (!fnic->vlan_hw_insert) {
1029 		eth_hdr = (struct ethhdr *)skb_mac_header(skb);
1030 		vlan_hdr = skb_push(skb, sizeof(*vlan_hdr) - sizeof(*eth_hdr));
1031 		memcpy(vlan_hdr, eth_hdr, 2 * ETH_ALEN);
1032 		vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
1033 		vlan_hdr->h_vlan_encapsulated_proto = eth_hdr->h_proto;
1034 		vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
1035 		if ((fnic_fc_trace_set_data(fnic->lport->host->host_no,
1036 			FNIC_FC_SEND|0x80, (char *)eth_hdr, skb->len)) != 0) {
1037 			printk(KERN_ERR "fnic ctlr frame trace error!!!");
1038 		}
1039 	} else {
1040 		if ((fnic_fc_trace_set_data(fnic->lport->host->host_no,
1041 			FNIC_FC_SEND|0x80, (char *)skb->data, skb->len)) != 0) {
1042 			printk(KERN_ERR "fnic ctlr frame trace error!!!");
1043 		}
1044 	}
1045 
1046 	pa = dma_map_single(&fnic->pdev->dev, skb->data, skb->len,
1047 			DMA_TO_DEVICE);
1048 	if (dma_mapping_error(&fnic->pdev->dev, pa)) {
1049 		printk(KERN_ERR "DMA mapping failed\n");
1050 		goto free_skb;
1051 	}
1052 
1053 	spin_lock_irqsave(&fnic->wq_lock[0], flags);
1054 	if (!vnic_wq_desc_avail(wq))
1055 		goto irq_restore;
1056 
1057 	fnic_queue_wq_eth_desc(wq, skb, pa, skb->len,
1058 			       0 /* hw inserts cos value */,
1059 			       fnic->vlan_id, 1);
1060 	spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
1061 	return;
1062 
1063 irq_restore:
1064 	spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
1065 	dma_unmap_single(&fnic->pdev->dev, pa, skb->len, DMA_TO_DEVICE);
1066 free_skb:
1067 	kfree_skb(skb);
1068 }
1069 
1070 /*
1071  * Send FC frame.
1072  */
1073 static int fnic_send_frame(struct fnic *fnic, struct fc_frame *fp)
1074 {
1075 	struct vnic_wq *wq = &fnic->wq[0];
1076 	struct sk_buff *skb;
1077 	dma_addr_t pa;
1078 	struct ethhdr *eth_hdr;
1079 	struct vlan_ethhdr *vlan_hdr;
1080 	struct fcoe_hdr *fcoe_hdr;
1081 	struct fc_frame_header *fh;
1082 	u32 tot_len, eth_hdr_len;
1083 	int ret = 0;
1084 	unsigned long flags;
1085 
1086 	fh = fc_frame_header_get(fp);
1087 	skb = fp_skb(fp);
1088 
1089 	if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
1090 	    fcoe_ctlr_els_send(&fnic->ctlr, fnic->lport, skb))
1091 		return 0;
1092 
1093 	if (!fnic->vlan_hw_insert) {
1094 		eth_hdr_len = sizeof(*vlan_hdr) + sizeof(*fcoe_hdr);
1095 		vlan_hdr = skb_push(skb, eth_hdr_len);
1096 		eth_hdr = (struct ethhdr *)vlan_hdr;
1097 		vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
1098 		vlan_hdr->h_vlan_encapsulated_proto = htons(ETH_P_FCOE);
1099 		vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
1100 		fcoe_hdr = (struct fcoe_hdr *)(vlan_hdr + 1);
1101 	} else {
1102 		eth_hdr_len = sizeof(*eth_hdr) + sizeof(*fcoe_hdr);
1103 		eth_hdr = skb_push(skb, eth_hdr_len);
1104 		eth_hdr->h_proto = htons(ETH_P_FCOE);
1105 		fcoe_hdr = (struct fcoe_hdr *)(eth_hdr + 1);
1106 	}
1107 
1108 	if (fnic->ctlr.map_dest)
1109 		fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id);
1110 	else
1111 		memcpy(eth_hdr->h_dest, fnic->ctlr.dest_addr, ETH_ALEN);
1112 	memcpy(eth_hdr->h_source, fnic->data_src_addr, ETH_ALEN);
1113 
1114 	tot_len = skb->len;
1115 	BUG_ON(tot_len % 4);
1116 
1117 	memset(fcoe_hdr, 0, sizeof(*fcoe_hdr));
1118 	fcoe_hdr->fcoe_sof = fr_sof(fp);
1119 	if (FC_FCOE_VER)
1120 		FC_FCOE_ENCAPS_VER(fcoe_hdr, FC_FCOE_VER);
1121 
1122 	pa = dma_map_single(&fnic->pdev->dev, eth_hdr, tot_len, DMA_TO_DEVICE);
1123 	if (dma_mapping_error(&fnic->pdev->dev, pa)) {
1124 		ret = -ENOMEM;
1125 		printk(KERN_ERR "DMA map failed with error %d\n", ret);
1126 		goto free_skb_on_err;
1127 	}
1128 
1129 	if ((fnic_fc_trace_set_data(fnic->lport->host->host_no, FNIC_FC_SEND,
1130 				(char *)eth_hdr, tot_len)) != 0) {
1131 		printk(KERN_ERR "fnic ctlr frame trace error!!!");
1132 	}
1133 
1134 	spin_lock_irqsave(&fnic->wq_lock[0], flags);
1135 
1136 	if (!vnic_wq_desc_avail(wq)) {
1137 		dma_unmap_single(&fnic->pdev->dev, pa, tot_len, DMA_TO_DEVICE);
1138 		ret = -1;
1139 		goto irq_restore;
1140 	}
1141 
1142 	fnic_queue_wq_desc(wq, skb, pa, tot_len, fr_eof(fp),
1143 			   0 /* hw inserts cos value */,
1144 			   fnic->vlan_id, 1, 1, 1);
1145 
1146 irq_restore:
1147 	spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
1148 
1149 free_skb_on_err:
1150 	if (ret)
1151 		dev_kfree_skb_any(fp_skb(fp));
1152 
1153 	return ret;
1154 }
1155 
1156 /*
1157  * fnic_send
1158  * Routine to send a raw frame
1159  */
1160 int fnic_send(struct fc_lport *lp, struct fc_frame *fp)
1161 {
1162 	struct fnic *fnic = lport_priv(lp);
1163 	unsigned long flags;
1164 
1165 	if (fnic->in_remove) {
1166 		dev_kfree_skb(fp_skb(fp));
1167 		return -1;
1168 	}
1169 
1170 	/*
1171 	 * Queue frame if in a transitional state.
1172 	 * This occurs while registering the Port_ID / MAC address after FLOGI.
1173 	 */
1174 	spin_lock_irqsave(&fnic->fnic_lock, flags);
1175 	if (fnic->state != FNIC_IN_FC_MODE && fnic->state != FNIC_IN_ETH_MODE) {
1176 		skb_queue_tail(&fnic->tx_queue, fp_skb(fp));
1177 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
1178 		return 0;
1179 	}
1180 	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
1181 
1182 	return fnic_send_frame(fnic, fp);
1183 }
1184 
1185 /**
1186  * fnic_flush_tx() - send queued frames.
1187  * @fnic: fnic device
1188  *
1189  * Send frames that were waiting to go out in FC or Ethernet mode.
1190  * Whenever changing modes we purge queued frames, so these frames should
1191  * be queued for the stable mode that we're in, either FC or Ethernet.
1192  *
1193  * Called without fnic_lock held.
1194  */
1195 void fnic_flush_tx(struct fnic *fnic)
1196 {
1197 	struct sk_buff *skb;
1198 	struct fc_frame *fp;
1199 
1200 	while ((skb = skb_dequeue(&fnic->tx_queue))) {
1201 		fp = (struct fc_frame *)skb;
1202 		fnic_send_frame(fnic, fp);
1203 	}
1204 }
1205 
1206 /**
1207  * fnic_set_eth_mode() - put fnic into ethernet mode.
1208  * @fnic: fnic device
1209  *
1210  * Called without fnic lock held.
1211  */
1212 static void fnic_set_eth_mode(struct fnic *fnic)
1213 {
1214 	unsigned long flags;
1215 	enum fnic_state old_state;
1216 	int ret;
1217 
1218 	spin_lock_irqsave(&fnic->fnic_lock, flags);
1219 again:
1220 	old_state = fnic->state;
1221 	switch (old_state) {
1222 	case FNIC_IN_FC_MODE:
1223 	case FNIC_IN_ETH_TRANS_FC_MODE:
1224 	default:
1225 		fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
1226 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
1227 
1228 		ret = fnic_fw_reset_handler(fnic);
1229 
1230 		spin_lock_irqsave(&fnic->fnic_lock, flags);
1231 		if (fnic->state != FNIC_IN_FC_TRANS_ETH_MODE)
1232 			goto again;
1233 		if (ret)
1234 			fnic->state = old_state;
1235 		break;
1236 
1237 	case FNIC_IN_FC_TRANS_ETH_MODE:
1238 	case FNIC_IN_ETH_MODE:
1239 		break;
1240 	}
1241 	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
1242 }
1243 
1244 static void fnic_wq_complete_frame_send(struct vnic_wq *wq,
1245 					struct cq_desc *cq_desc,
1246 					struct vnic_wq_buf *buf, void *opaque)
1247 {
1248 	struct sk_buff *skb = buf->os_buf;
1249 	struct fc_frame *fp = (struct fc_frame *)skb;
1250 	struct fnic *fnic = vnic_dev_priv(wq->vdev);
1251 
1252 	dma_unmap_single(&fnic->pdev->dev, buf->dma_addr, buf->len,
1253 			 DMA_TO_DEVICE);
1254 	dev_kfree_skb_irq(fp_skb(fp));
1255 	buf->os_buf = NULL;
1256 }
1257 
1258 static int fnic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
1259 				     struct cq_desc *cq_desc, u8 type,
1260 				     u16 q_number, u16 completed_index,
1261 				     void *opaque)
1262 {
1263 	struct fnic *fnic = vnic_dev_priv(vdev);
1264 	unsigned long flags;
1265 
1266 	spin_lock_irqsave(&fnic->wq_lock[q_number], flags);
1267 	vnic_wq_service(&fnic->wq[q_number], cq_desc, completed_index,
1268 			fnic_wq_complete_frame_send, NULL);
1269 	spin_unlock_irqrestore(&fnic->wq_lock[q_number], flags);
1270 
1271 	return 0;
1272 }
1273 
1274 int fnic_wq_cmpl_handler(struct fnic *fnic, int work_to_do)
1275 {
1276 	unsigned int wq_work_done = 0;
1277 	unsigned int i;
1278 
1279 	for (i = 0; i < fnic->raw_wq_count; i++) {
1280 		wq_work_done  += vnic_cq_service(&fnic->cq[fnic->rq_count+i],
1281 						 work_to_do,
1282 						 fnic_wq_cmpl_handler_cont,
1283 						 NULL);
1284 	}
1285 
1286 	return wq_work_done;
1287 }
1288 
1289 
1290 void fnic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
1291 {
1292 	struct fc_frame *fp = buf->os_buf;
1293 	struct fnic *fnic = vnic_dev_priv(wq->vdev);
1294 
1295 	dma_unmap_single(&fnic->pdev->dev, buf->dma_addr, buf->len,
1296 			 DMA_TO_DEVICE);
1297 
1298 	dev_kfree_skb(fp_skb(fp));
1299 	buf->os_buf = NULL;
1300 }
1301 
1302 void fnic_fcoe_reset_vlans(struct fnic *fnic)
1303 {
1304 	unsigned long flags;
1305 	struct fcoe_vlan *vlan;
1306 	struct fcoe_vlan *next;
1307 
1308 	/*
1309 	 * indicate a link down to fcoe so that all fcf's are free'd
1310 	 * might not be required since we did this before sending vlan
1311 	 * discovery request
1312 	 */
1313 	spin_lock_irqsave(&fnic->vlans_lock, flags);
1314 	if (!list_empty(&fnic->vlans)) {
1315 		list_for_each_entry_safe(vlan, next, &fnic->vlans, list) {
1316 			list_del(&vlan->list);
1317 			kfree(vlan);
1318 		}
1319 	}
1320 	spin_unlock_irqrestore(&fnic->vlans_lock, flags);
1321 }
1322 
1323 void fnic_handle_fip_timer(struct fnic *fnic)
1324 {
1325 	unsigned long flags;
1326 	struct fcoe_vlan *vlan;
1327 	struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1328 	u64 sol_time;
1329 
1330 	spin_lock_irqsave(&fnic->fnic_lock, flags);
1331 	if (fnic->stop_rx_link_events) {
1332 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
1333 		return;
1334 	}
1335 	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
1336 
1337 	if (fnic->ctlr.mode == FIP_MODE_NON_FIP)
1338 		return;
1339 
1340 	spin_lock_irqsave(&fnic->vlans_lock, flags);
1341 	if (list_empty(&fnic->vlans)) {
1342 		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
1343 		/* no vlans available, try again */
1344 		if (printk_ratelimit())
1345 			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
1346 				  "Start VLAN Discovery\n");
1347 		fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
1348 		return;
1349 	}
1350 
1351 	vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
1352 	shost_printk(KERN_DEBUG, fnic->lport->host,
1353 		  "fip_timer: vlan %d state %d sol_count %d\n",
1354 		  vlan->vid, vlan->state, vlan->sol_count);
1355 	switch (vlan->state) {
1356 	case FIP_VLAN_USED:
1357 		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
1358 			  "FIP VLAN is selected for FC transaction\n");
1359 		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
1360 		break;
1361 	case FIP_VLAN_FAILED:
1362 		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
1363 		/* if all vlans are in failed state, restart vlan disc */
1364 		if (printk_ratelimit())
1365 			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
1366 				  "Start VLAN Discovery\n");
1367 		fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
1368 		break;
1369 	case FIP_VLAN_SENT:
1370 		if (vlan->sol_count >= FCOE_CTLR_MAX_SOL) {
1371 			/*
1372 			 * no response on this vlan, remove  from the list.
1373 			 * Try the next vlan
1374 			 */
1375 			shost_printk(KERN_INFO, fnic->lport->host,
1376 				  "Dequeue this VLAN ID %d from list\n",
1377 				  vlan->vid);
1378 			list_del(&vlan->list);
1379 			kfree(vlan);
1380 			vlan = NULL;
1381 			if (list_empty(&fnic->vlans)) {
1382 				/* we exhausted all vlans, restart vlan disc */
1383 				spin_unlock_irqrestore(&fnic->vlans_lock,
1384 							flags);
1385 				shost_printk(KERN_INFO, fnic->lport->host,
1386 					  "fip_timer: vlan list empty, "
1387 					  "trigger vlan disc\n");
1388 				fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
1389 				return;
1390 			}
1391 			/* check the next vlan */
1392 			vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan,
1393 							list);
1394 			fnic->set_vlan(fnic, vlan->vid);
1395 			vlan->state = FIP_VLAN_SENT; /* sent now */
1396 		}
1397 		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
1398 		atomic64_inc(&fnic_stats->vlan_stats.sol_expiry_count);
1399 		vlan->sol_count++;
1400 		sol_time = jiffies + msecs_to_jiffies
1401 					(FCOE_CTLR_START_DELAY);
1402 		mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
1403 		break;
1404 	}
1405 }
1406