summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/fnic/fnic_fcs.c
blob: 483eb9dbe66366377c5dd4f049c15a160ca2a500 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/workqueue.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/fc_frame.h>
#include <scsi/libfc.h>
#include "fnic_io.h"
#include "fnic.h"
#include "cq_enet_desc.h"
#include "cq_exch_desc.h"

struct workqueue_struct *fnic_event_queue;

static void fnic_set_eth_mode(struct fnic *);

void fnic_handle_link(struct work_struct *work)
{
	struct fnic *fnic = container_of(work, struct fnic, link_work);
	unsigned long flags;
	int old_link_status;
	u32 old_link_down_cnt;

	spin_lock_irqsave(&fnic->fnic_lock, flags);

	if (fnic->stop_rx_link_events) {
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
		return;
	}

	old_link_down_cnt = fnic->link_down_cnt;
	old_link_status = fnic->link_status;
	fnic->link_status = vnic_dev_link_status(fnic->vdev);
	fnic->link_down_cnt = vnic_dev_link_down_cnt(fnic->vdev);

	if (old_link_status == fnic->link_status) {
		if (!fnic->link_status)
			/* DOWN -> DOWN */
			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
		else {
			if (old_link_down_cnt != fnic->link_down_cnt) {
				/* UP -> DOWN -> UP */
				fnic->lport->host_stats.link_failure_count++;
				spin_unlock_irqrestore(&fnic->fnic_lock, flags);
				FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
					     "link down\n");
				fcoe_ctlr_link_down(&fnic->ctlr);
				FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
					     "link up\n");
				fcoe_ctlr_link_up(&fnic->ctlr);
			} else
				/* UP -> UP */
				spin_unlock_irqrestore(&fnic->fnic_lock, flags);
		}
	} else if (fnic->link_status) {
		/* DOWN -> UP */
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link up\n");
		fcoe_ctlr_link_up(&fnic->ctlr);
	} else {
		/* UP -> DOWN */
		fnic->lport->host_stats.link_failure_count++;
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link down\n");
		fcoe_ctlr_link_down(&fnic->ctlr);
	}

}

/*
 * This function passes incoming fabric frames to libFC
 */
void fnic_handle_frame(struct work_struct *work)
{
	struct fnic *fnic = container_of(work, struct fnic, frame_work);
	struct fc_lport *lp = fnic->lport;
	unsigned long flags;
	struct sk_buff *skb;
	struct fc_frame *fp;

	while ((skb = skb_dequeue(&fnic->frame_queue))) {

		spin_lock_irqsave(&fnic->fnic_lock, flags);
		if (fnic->stop_rx_link_events) {
			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
			dev_kfree_skb(skb);
			return;
		}
		fp = (struct fc_frame *)skb;

		/*
		 * If we're in a transitional state, just re-queue and return.
		 * The queue will be serviced when we get to a stable state.
		 */
		if (fnic->state != FNIC_IN_FC_MODE &&
		    fnic->state != FNIC_IN_ETH_MODE) {
			skb_queue_head(&fnic->frame_queue, skb);
			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
			return;
		}
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);

		fc_exch_recv(lp, fp);
	}
}

/**
 * fnic_import_rq_eth_pkt() - handle received FCoE or FIP frame.
 * @fnic:	fnic instance.
 * @skb:	Ethernet Frame.
 */
static inline int fnic_import_rq_eth_pkt(struct fnic *fnic, struct sk_buff *skb)
{
	struct fc_frame *fp;
	struct ethhdr *eh;
	struct fcoe_hdr *fcoe_hdr;
	struct fcoe_crc_eof *ft;

	/*
	 * Undo VLAN encapsulation if present.
	 */
	eh = (struct ethhdr *)skb->data;
	if (eh->h_proto == htons(ETH_P_8021Q)) {
		memmove((u8 *)eh + VLAN_HLEN, eh, ETH_ALEN * 2);
		eh = (struct ethhdr *)skb_pull(skb, VLAN_HLEN);
		skb_reset_mac_header(skb);
	}
	if (eh->h_proto == htons(ETH_P_FIP)) {
		skb_pull(skb, sizeof(*eh));
		fcoe_ctlr_recv(&fnic->ctlr, skb);
		return 1;		/* let caller know packet was used */
	}
	if (eh->h_proto != htons(ETH_P_FCOE))
		goto drop;
	skb_set_network_header(skb, sizeof(*eh));
	skb_pull(skb, sizeof(*eh));

	fcoe_hdr = (struct fcoe_hdr *)skb->data;
	if (FC_FCOE_DECAPS_VER(fcoe_hdr) != FC_FCOE_VER)
		goto drop;

	fp = (struct fc_frame *)skb;
	fc_frame_init(fp);
	fr_sof(fp) = fcoe_hdr->fcoe_sof;
	skb_pull(skb, sizeof(struct fcoe_hdr));
	skb_reset_transport_header(skb);

	ft = (struct fcoe_crc_eof *)(skb->data + skb->len - sizeof(*ft));
	fr_eof(fp) = ft->fcoe_eof;
	skb_trim(skb, skb->len - sizeof(*ft));
	return 0;
drop:
	dev_kfree_skb_irq(skb);
	return -1;
}

/**
 * fnic_update_mac_locked() - set data MAC address and filters.
 * @fnic:	fnic instance.
 * @new:	newly-assigned FCoE MAC address.
 *
 * Called with the fnic lock held.
 */
void fnic_update_mac_locked(struct fnic *fnic, u8 *new)
{
	u8 *ctl = fnic->ctlr.ctl_src_addr;
	u8 *data = fnic->data_src_addr;

	if (is_zero_ether_addr(new))
		new = ctl;
	if (!compare_ether_addr(data, new))
		return;
	FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "update_mac %pM\n", new);
	if (!is_zero_ether_addr(data) && compare_ether_addr(data, ctl))
		vnic_dev_del_addr(fnic->vdev, data);
	memcpy(data, new, ETH_ALEN);
	if (compare_ether_addr(new, ctl))
		vnic_dev_add_addr(fnic->vdev, new);
}

/**
 * fnic_update_mac() - set data MAC address and filters.
 * @lport:	local port.
 * @new:	newly-assigned FCoE MAC address.
 */
void fnic_update_mac(struct fc_lport *lport, u8 *new)
{
	struct fnic *fnic = lport_priv(lport);

	spin_lock_irq(&fnic->fnic_lock);
	fnic_update_mac_locked(fnic, new);
	spin_unlock_irq(&fnic->fnic_lock);
}

/**
 * fnic_set_port_id() - set the port_ID after successful FLOGI.
 * @lport:	local port.
 * @port_id:	assigned FC_ID.
 * @fp:		received frame containing the FLOGI accept or NULL.
 *
 * This is called from libfc when a new FC_ID has been assigned.
 * This causes us to reset the firmware to FC_MODE and setup the new MAC
 * address and FC_ID.
 *
 * It is also called with FC_ID 0 when we're logged off.
 *
 * If the FC_ID is due to point-to-point, fp may be NULL.
 */
void fnic_set_port_id(struct fc_lport *lport, u32 port_id, struct fc_frame *fp)
{
	struct fnic *fnic = lport_priv(lport);
	u8 *mac;
	int ret;

	FNIC_FCS_DBG(KERN_DEBUG, lport->host, "set port_id %x fp %p\n",
		     port_id, fp);

	/*
	 * If we're clearing the FC_ID, change to use the ctl_src_addr.
	 * Set ethernet mode to send FLOGI.
	 */
	if (!port_id) {
		fnic_update_mac(lport, fnic->ctlr.ctl_src_addr);
		fnic_set_eth_mode(fnic);
		return;
	}

	if (fp) {
		mac = fr_cb(fp)->granted_mac;
		if (is_zero_ether_addr(mac)) {
			/* non-FIP - FLOGI already accepted - ignore return */
			fcoe_ctlr_recv_flogi(&fnic->ctlr, lport, fp);
		}
		fnic_update_mac(lport, mac);
	}

	/* Change state to reflect transition to FC mode */
	spin_lock_irq(&fnic->fnic_lock);
	if (fnic->state == FNIC_IN_ETH_MODE || fnic->state == FNIC_IN_FC_MODE)
		fnic->state = FNIC_IN_ETH_TRANS_FC_MODE;
	else {
		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
			     "Unexpected fnic state %s while"
			     " processing flogi resp\n",
			     fnic_state_to_str(fnic->state));
		spin_unlock_irq(&fnic->fnic_lock);
		return;
	}
	spin_unlock_irq(&fnic->fnic_lock);

	/*
	 * Send FLOGI registration to firmware to set up FC mode.
	 * The new address will be set up when registration completes.
	 */
	ret = fnic_flogi_reg_handler(fnic, port_id);

	if (ret < 0) {
		spin_lock_irq(&fnic->fnic_lock);
		if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE)
			fnic->state = FNIC_IN_ETH_MODE;
		spin_unlock_irq(&fnic->fnic_lock);
	}
}

static void fnic_rq_cmpl_frame_recv(struct vnic_rq *rq, struct cq_desc
				    *cq_desc, struct vnic_rq_buf *buf,
				    int skipped __attribute__((unused)),
				    void *opaque)
{
	struct fnic *fnic = vnic_dev_priv(rq->vdev);
	struct sk_buff *skb;
	struct fc_frame *fp;
	unsigned int eth_hdrs_stripped;
	u8 type, color, eop, sop, ingress_port, vlan_stripped;
	u8 fcoe = 0, fcoe_sof, fcoe_eof;
	u8 fcoe_fc_crc_ok = 1, fcoe_enc_error = 0;
	u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
	u8 ipv6, ipv4, ipv4_fragment, rss_type, csum_not_calc;
	u8 fcs_ok = 1, packet_error = 0;
	u16 q_number, completed_index, bytes_written = 0, vlan, checksum;
	u32 rss_hash;
	u16 exchange_id, tmpl;
	u8 sof = 0;
	u8 eof = 0;
	u32 fcp_bytes_written = 0;
	unsigned long flags;

	pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len,
			 PCI_DMA_FROMDEVICE);
	skb = buf->os_buf;
	fp = (struct fc_frame *)skb;
	buf->os_buf = NULL;

	cq_desc_dec(cq_desc, &type, &color, &q_number, &completed_index);
	if (type == CQ_DESC_TYPE_RQ_FCP) {
		cq_fcp_rq_desc_dec((struct cq_fcp_rq_desc *)cq_desc,
				   &type, &color, &q_number, &completed_index,
				   &eop, &sop, &fcoe_fc_crc_ok, &exchange_id,
				   &tmpl, &fcp_bytes_written, &sof, &eof,
				   &ingress_port, &packet_error,
				   &fcoe_enc_error, &fcs_ok, &vlan_stripped,
				   &vlan);
		eth_hdrs_stripped = 1;
		skb_trim(skb, fcp_bytes_written);
		fr_sof(fp) = sof;
		fr_eof(fp) = eof;

	} else if (type == CQ_DESC_TYPE_RQ_ENET) {
		cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
				    &type, &color, &q_number, &completed_index,
				    &ingress_port, &fcoe, &eop, &sop,
				    &rss_type, &csum_not_calc, &rss_hash,
				    &bytes_written, &packet_error,
				    &vlan_stripped, &vlan, &checksum,
				    &fcoe_sof, &fcoe_fc_crc_ok,
				    &fcoe_enc_error, &fcoe_eof,
				    &tcp_udp_csum_ok, &udp, &tcp,
				    &ipv4_csum_ok, &ipv6, &ipv4,
				    &ipv4_fragment, &fcs_ok);
		eth_hdrs_stripped = 0;
		skb_trim(skb, bytes_written);
		if (!fcs_ok) {
			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
				     "fcs error.  dropping packet.\n");
			goto drop;
		}
		if (fnic_import_rq_eth_pkt(fnic, skb))
			return;

	} else {
		/* wrong CQ type*/
		shost_printk(KERN_ERR, fnic->lport->host,
			     "fnic rq_cmpl wrong cq type x%x\n", type);
		goto drop;
	}

	if (!fcs_ok || packet_error || !fcoe_fc_crc_ok || fcoe_enc_error) {
		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
			     "fnic rq_cmpl fcoe x%x fcsok x%x"
			     " pkterr x%x fcoe_fc_crc_ok x%x, fcoe_enc_err"
			     " x%x\n",
			     fcoe, fcs_ok, packet_error,
			     fcoe_fc_crc_ok, fcoe_enc_error);
		goto drop;
	}

	spin_lock_irqsave(&fnic->fnic_lock, flags);
	if (fnic->stop_rx_link_events) {
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
		goto drop;
	}
	fr_dev(fp) = fnic->lport;
	spin_unlock_irqrestore(&fnic->fnic_lock, flags);

	skb_queue_tail(&fnic->frame_queue, skb);
	queue_work(fnic_event_queue, &fnic->frame_work);

	return;
drop:
	dev_kfree_skb_irq(skb);
}

static int fnic_rq_cmpl_handler_cont(struct vnic_dev *vdev,
				     struct cq_desc *cq_desc, u8 type,
				     u16 q_number, u16 completed_index,
				     void *opaque)
{
	struct fnic *fnic = vnic_dev_priv(vdev);

	vnic_rq_service(&fnic->rq[q_number], cq_desc, completed_index,
			VNIC_RQ_RETURN_DESC, fnic_rq_cmpl_frame_recv,
			NULL);
	return 0;
}

int fnic_rq_cmpl_handler(struct fnic *fnic, int rq_work_to_do)
{
	unsigned int tot_rq_work_done = 0, cur_work_done;
	unsigned int i;
	int err;

	for (i = 0; i < fnic->rq_count; i++) {
		cur_work_done = vnic_cq_service(&fnic->cq[i], rq_work_to_do,
						fnic_rq_cmpl_handler_cont,
						NULL);
		if (cur_work_done) {
			err = vnic_rq_fill(&fnic->rq[i], fnic_alloc_rq_frame);
			if (err)
				shost_printk(KERN_ERR, fnic->lport->host,
					     "fnic_alloc_rq_frame can't alloc"
					     " frame\n");
		}
		tot_rq_work_done += cur_work_done;
	}

	return tot_rq_work_done;
}

/*
 * This function is called once at init time to allocate and fill RQ
 * buffers. Subsequently, it is called in the interrupt context after RQ
 * buffer processing to replenish the buffers in the RQ
 */
int fnic_alloc_rq_frame(struct vnic_rq *rq)
{
	struct fnic *fnic = vnic_dev_priv(rq->vdev);
	struct sk_buff *skb;
	u16 len;
	dma_addr_t pa;

	len = FC_FRAME_HEADROOM + FC_MAX_FRAME + FC_FRAME_TAILROOM;
	skb = dev_alloc_skb(len);
	if (!skb) {
		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
			     "Unable to allocate RQ sk_buff\n");
		return -ENOMEM;
	}
	skb_reset_mac_header(skb);
	skb_reset_transport_header(skb);
	skb_reset_network_header(skb);
	skb_put(skb, len);
	pa = pci_map_single(fnic->pdev, skb->data, len, PCI_DMA_FROMDEVICE);
	fnic_queue_rq_desc(rq, skb, pa, len);
	return 0;
}

void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
{
	struct fc_frame *fp = buf->os_buf;
	struct fnic *fnic = vnic_dev_priv(rq->vdev);

	pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len,
			 PCI_DMA_FROMDEVICE);

	dev_kfree_skb(fp_skb(fp));
	buf->os_buf = NULL;
}

/**
 * fnic_eth_send() - Send Ethernet frame.
 * @fip:	fcoe_ctlr instance.
 * @skb:	Ethernet Frame, FIP, without VLAN encapsulation.
 */
void fnic_eth_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fnic *fnic = fnic_from_ctlr(fip);
	struct vnic_wq *wq = &fnic->wq[0];
	dma_addr_t pa;
	struct ethhdr *eth_hdr;
	struct vlan_ethhdr *vlan_hdr;
	unsigned long flags;

	if (!fnic->vlan_hw_insert) {
		eth_hdr = (struct ethhdr *)skb_mac_header(skb);
		vlan_hdr = (struct vlan_ethhdr *)skb_push(skb,
				sizeof(*vlan_hdr) - sizeof(*eth_hdr));
		memcpy(vlan_hdr, eth_hdr, 2 * ETH_ALEN);
		vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
		vlan_hdr->h_vlan_encapsulated_proto = eth_hdr->h_proto;
		vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
	}

	pa = pci_map_single(fnic->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);

	spin_lock_irqsave(&fnic->wq_lock[0], flags);
	if (!vnic_wq_desc_avail(wq)) {
		pci_unmap_single(fnic->pdev, pa, skb->len, PCI_DMA_TODEVICE);
		spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
		kfree_skb(skb);
		return;
	}

	fnic_queue_wq_eth_desc(wq, skb, pa, skb->len,
			       0 /* hw inserts cos value */,
			       fnic->vlan_id, 1);
	spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
}

/*
 * Send FC frame.
 */
static int fnic_send_frame(struct fnic *fnic, struct fc_frame *fp)
{
	struct vnic_wq *wq = &fnic->wq[0];
	struct sk_buff *skb;
	dma_addr_t pa;
	struct ethhdr *eth_hdr;
	struct vlan_ethhdr *vlan_hdr;
	struct fcoe_hdr *fcoe_hdr;
	struct fc_frame_header *fh;
	u32 tot_len, eth_hdr_len;
	int ret = 0;
	unsigned long flags;

	fh = fc_frame_header_get(fp);
	skb = fp_skb(fp);

	if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
	    fcoe_ctlr_els_send(&fnic->ctlr, fnic->lport, skb))
		return 0;

	if (!fnic->vlan_hw_insert) {
		eth_hdr_len = sizeof(*vlan_hdr) + sizeof(*fcoe_hdr);
		vlan_hdr = (struct vlan_ethhdr *)skb_push(skb, eth_hdr_len);
		eth_hdr = (struct ethhdr *)vlan_hdr;
		vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
		vlan_hdr->h_vlan_encapsulated_proto = htons(ETH_P_FCOE);
		vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
		fcoe_hdr = (struct fcoe_hdr *)(vlan_hdr + 1);
	} else {
		eth_hdr_len = sizeof(*eth_hdr) + sizeof(*fcoe_hdr);
		eth_hdr = (struct ethhdr *)skb_push(skb, eth_hdr_len);
		eth_hdr->h_proto = htons(ETH_P_FCOE);
		fcoe_hdr = (struct fcoe_hdr *)(eth_hdr + 1);
	}

	if (fnic->ctlr.map_dest)
		fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id);
	else
		memcpy(eth_hdr->h_dest, fnic->ctlr.dest_addr, ETH_ALEN);
	memcpy(eth_hdr->h_source, fnic->data_src_addr, ETH_ALEN);

	tot_len = skb->len;
	BUG_ON(tot_len % 4);

	memset(fcoe_hdr, 0, sizeof(*fcoe_hdr));
	fcoe_hdr->fcoe_sof = fr_sof(fp);
	if (FC_FCOE_VER)
		FC_FCOE_ENCAPS_VER(fcoe_hdr, FC_FCOE_VER);

	pa = pci_map_single(fnic->pdev, eth_hdr, tot_len, PCI_DMA_TODEVICE);

	spin_lock_irqsave(&fnic->wq_lock[0], flags);

	if (!vnic_wq_desc_avail(wq)) {
		pci_unmap_single(fnic->pdev, pa,
				 tot_len, PCI_DMA_TODEVICE);
		ret = -1;
		goto fnic_send_frame_end;
	}

	fnic_queue_wq_desc(wq, skb, pa, tot_len, fr_eof(fp),
			   0 /* hw inserts cos value */,
			   fnic->vlan_id, 1, 1, 1);
fnic_send_frame_end:
	spin_unlock_irqrestore(&fnic->wq_lock[0], flags);

	if (ret)
		dev_kfree_skb_any(fp_skb(fp));

	return ret;
}

/*
 * fnic_send
 * Routine to send a raw frame
 */
int fnic_send(struct fc_lport *lp, struct fc_frame *fp)
{
	struct fnic *fnic = lport_priv(lp);
	unsigned long flags;

	if (fnic->in_remove) {
		dev_kfree_skb(fp_skb(fp));
		return -1;
	}

	/*
	 * Queue frame if in a transitional state.
	 * This occurs while registering the Port_ID / MAC address after FLOGI.
	 */
	spin_lock_irqsave(&fnic->fnic_lock, flags);
	if (fnic->state != FNIC_IN_FC_MODE && fnic->state != FNIC_IN_ETH_MODE) {
		skb_queue_tail(&fnic->tx_queue, fp_skb(fp));
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
		return 0;
	}
	spin_unlock_irqrestore(&fnic->fnic_lock, flags);

	return fnic_send_frame(fnic, fp);
}

/**
 * fnic_flush_tx() - send queued frames.
 * @fnic: fnic device
 *
 * Send frames that were waiting to go out in FC or Ethernet mode.
 * Whenever changing modes we purge queued frames, so these frames should
 * be queued for the stable mode that we're in, either FC or Ethernet.
 *
 * Called without fnic_lock held.
 */
void fnic_flush_tx(struct fnic *fnic)
{
	struct sk_buff *skb;
	struct fc_frame *fp;

	while ((skb = skb_dequeue(&fnic->tx_queue))) {
		fp = (struct fc_frame *)skb;
		fnic_send_frame(fnic, fp);
	}
}

/**
 * fnic_set_eth_mode() - put fnic into ethernet mode.
 * @fnic: fnic device
 *
 * Called without fnic lock held.
 */
static void fnic_set_eth_mode(struct fnic *fnic)
{
	unsigned long flags;
	enum fnic_state old_state;
	int ret;

	spin_lock_irqsave(&fnic->fnic_lock, flags);
again:
	old_state = fnic->state;
	switch (old_state) {
	case FNIC_IN_FC_MODE:
	case FNIC_IN_ETH_TRANS_FC_MODE:
	default:
		fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);

		ret = fnic_fw_reset_handler(fnic);

		spin_lock_irqsave(&fnic->fnic_lock, flags);
		if (fnic->state != FNIC_IN_FC_TRANS_ETH_MODE)
			goto again;
		if (ret)
			fnic->state = old_state;
		break;

	case FNIC_IN_FC_TRANS_ETH_MODE:
	case FNIC_IN_ETH_MODE:
		break;
	}
	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
}

static void fnic_wq_complete_frame_send(struct vnic_wq *wq,
					struct cq_desc *cq_desc,
					struct vnic_wq_buf *buf, void *opaque)
{
	struct sk_buff *skb = buf->os_buf;
	struct fc_frame *fp = (struct fc_frame *)skb;
	struct fnic *fnic = vnic_dev_priv(wq->vdev);

	pci_unmap_single(fnic->pdev, buf->dma_addr,
			 buf->len, PCI_DMA_TODEVICE);
	dev_kfree_skb_irq(fp_skb(fp));
	buf->os_buf = NULL;
}

static int fnic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
				     struct cq_desc *cq_desc, u8 type,
				     u16 q_number, u16 completed_index,
				     void *opaque)
{
	struct fnic *fnic = vnic_dev_priv(vdev);
	unsigned long flags;

	spin_lock_irqsave(&fnic->wq_lock[q_number], flags);
	vnic_wq_service(&fnic->wq[q_number], cq_desc, completed_index,
			fnic_wq_complete_frame_send, NULL);
	spin_unlock_irqrestore(&fnic->wq_lock[q_number], flags);

	return 0;
}

int fnic_wq_cmpl_handler(struct fnic *fnic, int work_to_do)
{
	unsigned int wq_work_done = 0;
	unsigned int i;

	for (i = 0; i < fnic->raw_wq_count; i++) {
		wq_work_done  += vnic_cq_service(&fnic->cq[fnic->rq_count+i],
						 work_to_do,
						 fnic_wq_cmpl_handler_cont,
						 NULL);
	}

	return wq_work_done;
}


void fnic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
{
	struct fc_frame *fp = buf->os_buf;
	struct fnic *fnic = vnic_dev_priv(wq->vdev);

	pci_unmap_single(fnic->pdev, buf->dma_addr,
			 buf->len, PCI_DMA_TODEVICE);

	dev_kfree_skb(fp_skb(fp));
	buf->os_buf = NULL;
}