summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c
blob: f58db453a97edd8d6d6f7dfbccb2c6f8edd1f3d3 (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
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
/*******************************************************************************

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 2013 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include "ixgbe.h"
#include <linux/if_ether.h>
#include <linux/gfp.h>
#include <linux/if_vlan.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h>
#include <scsi/libfcoe.h>

/**
 * ixgbe_fcoe_clear_ddp - clear the given ddp context
 * @ddp: ptr to the ixgbe_fcoe_ddp
 *
 * Returns : none
 *
 */
static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
{
	ddp->len = 0;
	ddp->err = 1;
	ddp->udl = NULL;
	ddp->udp = 0UL;
	ddp->sgl = NULL;
	ddp->sgc = 0;
}

/**
 * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
 * @netdev: the corresponding net_device
 * @xid: the xid that corresponding ddp will be freed
 *
 * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
 * and it is expected to be called by ULD, i.e., FCP layer of libfc
 * to release the corresponding ddp context when the I/O is done.
 *
 * Returns : data length already ddp-ed in bytes
 */
int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
{
	int len = 0;
	struct ixgbe_fcoe *fcoe;
	struct ixgbe_adapter *adapter;
	struct ixgbe_fcoe_ddp *ddp;
	u32 fcbuff;

	if (!netdev)
		goto out_ddp_put;

	if (xid >= IXGBE_FCOE_DDP_MAX)
		goto out_ddp_put;

	adapter = netdev_priv(netdev);
	fcoe = &adapter->fcoe;
	ddp = &fcoe->ddp[xid];
	if (!ddp->udl)
		goto out_ddp_put;

	len = ddp->len;
	/* if there an error, force to invalidate ddp context */
	if (ddp->err) {
		spin_lock_bh(&fcoe->lock);
		IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLT, 0);
		IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLTRW,
				(xid | IXGBE_FCFLTRW_WE));
		IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCBUFF, 0);
		IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
				(xid | IXGBE_FCDMARW_WE));

		/* guaranteed to be invalidated after 100us */
		IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
				(xid | IXGBE_FCDMARW_RE));
		fcbuff = IXGBE_READ_REG(&adapter->hw, IXGBE_FCBUFF);
		spin_unlock_bh(&fcoe->lock);
		if (fcbuff & IXGBE_FCBUFF_VALID)
			udelay(100);
	}
	if (ddp->sgl)
		dma_unmap_sg(&adapter->pdev->dev, ddp->sgl, ddp->sgc,
			     DMA_FROM_DEVICE);
	if (ddp->pool) {
		dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
		ddp->pool = NULL;
	}

	ixgbe_fcoe_clear_ddp(ddp);

out_ddp_put:
	return len;
}

/**
 * ixgbe_fcoe_ddp_setup - called to set up ddp context
 * @netdev: the corresponding net_device
 * @xid: the exchange id requesting ddp
 * @sgl: the scatter-gather list for this request
 * @sgc: the number of scatter-gather items
 *
 * Returns : 1 for success and 0 for no ddp
 */
static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
				struct scatterlist *sgl, unsigned int sgc,
				int target_mode)
{
	struct ixgbe_adapter *adapter;
	struct ixgbe_hw *hw;
	struct ixgbe_fcoe *fcoe;
	struct ixgbe_fcoe_ddp *ddp;
	struct ixgbe_fcoe_ddp_pool *ddp_pool;
	struct scatterlist *sg;
	unsigned int i, j, dmacount;
	unsigned int len;
	static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
	unsigned int firstoff = 0;
	unsigned int lastsize;
	unsigned int thisoff = 0;
	unsigned int thislen = 0;
	u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
	dma_addr_t addr = 0;

	if (!netdev || !sgl)
		return 0;

	adapter = netdev_priv(netdev);
	if (xid >= IXGBE_FCOE_DDP_MAX) {
		e_warn(drv, "xid=0x%x out-of-range\n", xid);
		return 0;
	}

	/* no DDP if we are already down or resetting */
	if (test_bit(__IXGBE_DOWN, &adapter->state) ||
	    test_bit(__IXGBE_RESETTING, &adapter->state))
		return 0;

	fcoe = &adapter->fcoe;
	ddp = &fcoe->ddp[xid];
	if (ddp->sgl) {
		e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
		      xid, ddp->sgl, ddp->sgc);
		return 0;
	}
	ixgbe_fcoe_clear_ddp(ddp);


	if (!fcoe->ddp_pool) {
		e_warn(drv, "No ddp_pool resources allocated\n");
		return 0;
	}

	ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
	if (!ddp_pool->pool) {
		e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
		goto out_noddp;
	}

	/* setup dma from scsi command sgl */
	dmacount = dma_map_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
	if (dmacount == 0) {
		e_err(drv, "xid 0x%x DMA map error\n", xid);
		goto out_noddp;
	}

	/* alloc the udl from per cpu ddp pool */
	ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
	if (!ddp->udl) {
		e_err(drv, "failed allocated ddp context\n");
		goto out_noddp_unmap;
	}
	ddp->pool = ddp_pool->pool;
	ddp->sgl = sgl;
	ddp->sgc = sgc;

	j = 0;
	for_each_sg(sgl, sg, dmacount, i) {
		addr = sg_dma_address(sg);
		len = sg_dma_len(sg);
		while (len) {
			/* max number of buffers allowed in one DDP context */
			if (j >= IXGBE_BUFFCNT_MAX) {
				ddp_pool->noddp++;
				goto out_noddp_free;
			}

			/* get the offset of length of current buffer */
			thisoff = addr & ((dma_addr_t)bufflen - 1);
			thislen = min((bufflen - thisoff), len);
			/*
			 * all but the 1st buffer (j == 0)
			 * must be aligned on bufflen
			 */
			if ((j != 0) && (thisoff))
				goto out_noddp_free;
			/*
			 * all but the last buffer
			 * ((i == (dmacount - 1)) && (thislen == len))
			 * must end at bufflen
			 */
			if (((i != (dmacount - 1)) || (thislen != len))
			    && ((thislen + thisoff) != bufflen))
				goto out_noddp_free;

			ddp->udl[j] = (u64)(addr - thisoff);
			/* only the first buffer may have none-zero offset */
			if (j == 0)
				firstoff = thisoff;
			len -= thislen;
			addr += thislen;
			j++;
		}
	}
	/* only the last buffer may have non-full bufflen */
	lastsize = thisoff + thislen;

	/*
	 * lastsize can not be buffer len.
	 * If it is then adding another buffer with lastsize = 1.
	 */
	if (lastsize == bufflen) {
		if (j >= IXGBE_BUFFCNT_MAX) {
			ddp_pool->noddp_ext_buff++;
			goto out_noddp_free;
		}

		ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
		j++;
		lastsize = 1;
	}
	put_cpu();

	fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
	fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
	fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
	/* Set WRCONTX bit to allow DDP for target */
	if (target_mode)
		fcbuff |= (IXGBE_FCBUFF_WRCONTX);
	fcbuff |= (IXGBE_FCBUFF_VALID);

	fcdmarw = xid;
	fcdmarw |= IXGBE_FCDMARW_WE;
	fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);

	fcfltrw = xid;
	fcfltrw |= IXGBE_FCFLTRW_WE;

	/* program DMA context */
	hw = &adapter->hw;
	spin_lock_bh(&fcoe->lock);

	/* turn on last frame indication for target mode as FCP_RSPtarget is
	 * supposed to send FCP_RSP when it is done. */
	if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
		set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
		fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
		fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
		IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
	}

	IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
	IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
	IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
	IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
	/* program filter context */
	IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
	IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
	IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);

	spin_unlock_bh(&fcoe->lock);

	return 1;

out_noddp_free:
	dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
	ixgbe_fcoe_clear_ddp(ddp);

out_noddp_unmap:
	dma_unmap_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
out_noddp:
	put_cpu();
	return 0;
}

/**
 * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
 * @netdev: the corresponding net_device
 * @xid: the exchange id requesting ddp
 * @sgl: the scatter-gather list for this request
 * @sgc: the number of scatter-gather items
 *
 * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 * and is expected to be called from ULD, e.g., FCP layer of libfc
 * to set up ddp for the corresponding xid of the given sglist for
 * the corresponding I/O.
 *
 * Returns : 1 for success and 0 for no ddp
 */
int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
		       struct scatterlist *sgl, unsigned int sgc)
{
	return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
}

/**
 * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
 * @netdev: the corresponding net_device
 * @xid: the exchange id requesting ddp
 * @sgl: the scatter-gather list for this request
 * @sgc: the number of scatter-gather items
 *
 * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
 * and is expected to be called from ULD, e.g., FCP layer of libfc
 * to set up ddp for the corresponding xid of the given sglist for
 * the corresponding I/O. The DDP in target mode is a write I/O request
 * from the initiator.
 *
 * Returns : 1 for success and 0 for no ddp
 */
int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
			    struct scatterlist *sgl, unsigned int sgc)
{
	return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
}

/**
 * ixgbe_fcoe_ddp - check ddp status and mark it done
 * @adapter: ixgbe adapter
 * @rx_desc: advanced rx descriptor
 * @skb: the skb holding the received data
 *
 * This checks ddp status.
 *
 * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 * not passing the skb to ULD, > 0 indicates is the length of data
 * being ddped.
 */
int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
		   union ixgbe_adv_rx_desc *rx_desc,
		   struct sk_buff *skb)
{
	int rc = -EINVAL;
	struct ixgbe_fcoe *fcoe;
	struct ixgbe_fcoe_ddp *ddp;
	struct fc_frame_header *fh;
	struct fcoe_crc_eof *crc;
	__le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
	__le32 ddp_err;
	u32 fctl;
	u16 xid;

	if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
		skb->ip_summed = CHECKSUM_NONE;
	else
		skb->ip_summed = CHECKSUM_UNNECESSARY;

	if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
		fh = (struct fc_frame_header *)(skb->data +
			sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
	else
		fh = (struct fc_frame_header *)(skb->data +
			sizeof(struct fcoe_hdr));

	fctl = ntoh24(fh->fh_f_ctl);
	if (fctl & FC_FC_EX_CTX)
		xid =  be16_to_cpu(fh->fh_ox_id);
	else
		xid =  be16_to_cpu(fh->fh_rx_id);

	if (xid >= IXGBE_FCOE_DDP_MAX)
		goto ddp_out;

	fcoe = &adapter->fcoe;
	ddp = &fcoe->ddp[xid];
	if (!ddp->udl)
		goto ddp_out;

	ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
					      IXGBE_RXDADV_ERR_FCERR);
	if (ddp_err)
		goto ddp_out;

	switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
	/* return 0 to bypass going to ULD for DDPed data */
	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
		/* update length of DDPed data */
		ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
		rc = 0;
		break;
	/* unmap the sg list when FCPRSP is received */
	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
		dma_unmap_sg(&adapter->pdev->dev, ddp->sgl,
			     ddp->sgc, DMA_FROM_DEVICE);
		ddp->err = ddp_err;
		ddp->sgl = NULL;
		ddp->sgc = 0;
		/* fall through */
	/* if DDP length is present pass it through to ULD */
	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
		/* update length of DDPed data */
		ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
		if (ddp->len)
			rc = ddp->len;
		break;
	/* no match will return as an error */
	case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
	default:
		break;
	}

	/* In target mode, check the last data frame of the sequence.
	 * For DDP in target mode, data is already DDPed but the header
	 * indication of the last data frame ould allow is to tell if we
	 * got all the data and the ULP can send FCP_RSP back, as this is
	 * not a full fcoe frame, we fill the trailer here so it won't be
	 * dropped by the ULP stack.
	 */
	if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
	    (fctl & FC_FC_END_SEQ)) {
		skb_linearize(skb);
		crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
		crc->fcoe_eof = FC_EOF_T;
	}
ddp_out:
	return rc;
}

/**
 * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 * @tx_ring: tx desc ring
 * @first: first tx_buffer structure containing skb, tx_flags, and protocol
 * @hdr_len: hdr_len to be returned
 *
 * This sets up large send offload for FCoE
 *
 * Returns : 0 indicates success, < 0 for error
 */
int ixgbe_fso(struct ixgbe_ring *tx_ring,
	      struct ixgbe_tx_buffer *first,
	      u8 *hdr_len)
{
	struct sk_buff *skb = first->skb;
	struct fc_frame_header *fh;
	u32 vlan_macip_lens;
	u32 fcoe_sof_eof = 0;
	u32 mss_l4len_idx;
	u8 sof, eof;

	if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
		dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
			skb_shinfo(skb)->gso_type);
		return -EINVAL;
	}

	/* resets the header to point fcoe/fc */
	skb_set_network_header(skb, skb->mac_len);
	skb_set_transport_header(skb, skb->mac_len +
				 sizeof(struct fcoe_hdr));

	/* sets up SOF and ORIS */
	sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
	switch (sof) {
	case FC_SOF_I2:
		fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
		break;
	case FC_SOF_I3:
		fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
			       IXGBE_ADVTXD_FCOEF_ORIS;
		break;
	case FC_SOF_N2:
		break;
	case FC_SOF_N3:
		fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
		break;
	default:
		dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
		return -EINVAL;
	}

	/* the first byte of the last dword is EOF */
	skb_copy_bits(skb, skb->len - 4, &eof, 1);
	/* sets up EOF and ORIE */
	switch (eof) {
	case FC_EOF_N:
		fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
		break;
	case FC_EOF_T:
		/* lso needs ORIE */
		if (skb_is_gso(skb))
			fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
					IXGBE_ADVTXD_FCOEF_ORIE;
		else
			fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
		break;
	case FC_EOF_NI:
		fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
		break;
	case FC_EOF_A:
		fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
		break;
	default:
		dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
		return -EINVAL;
	}

	/* sets up PARINC indicating data offset */
	fh = (struct fc_frame_header *)skb_transport_header(skb);
	if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
		fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;

	/* include trailer in headlen as it is replicated per frame */
	*hdr_len = sizeof(struct fcoe_crc_eof);

	/* hdr_len includes fc_hdr if FCoE LSO is enabled */
	if (skb_is_gso(skb)) {
		*hdr_len += skb_transport_offset(skb) +
			    sizeof(struct fc_frame_header);
		/* update gso_segs and bytecount */
		first->gso_segs = DIV_ROUND_UP(skb->len - *hdr_len,
					       skb_shinfo(skb)->gso_size);
		first->bytecount += (first->gso_segs - 1) * *hdr_len;
		first->tx_flags |= IXGBE_TX_FLAGS_TSO;
	}

	/* set flag indicating FCOE to ixgbe_tx_map call */
	first->tx_flags |= IXGBE_TX_FLAGS_FCOE | IXGBE_TX_FLAGS_CC;

	/* mss_l4len_id: use 0 for FSO as TSO, no need for L4LEN */
	mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;

	/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
	vlan_macip_lens = skb_transport_offset(skb) +
			  sizeof(struct fc_frame_header);
	vlan_macip_lens |= (skb_transport_offset(skb) - 4)
			   << IXGBE_ADVTXD_MACLEN_SHIFT;
	vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;

	/* write context desc */
	ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
			  IXGBE_ADVTXT_TUCMD_FCOE, mss_l4len_idx);

	return 0;
}

static void ixgbe_fcoe_dma_pool_free(struct ixgbe_fcoe *fcoe, unsigned int cpu)
{
	struct ixgbe_fcoe_ddp_pool *ddp_pool;

	ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
	if (ddp_pool->pool)
		dma_pool_destroy(ddp_pool->pool);
	ddp_pool->pool = NULL;
}

static int ixgbe_fcoe_dma_pool_alloc(struct ixgbe_fcoe *fcoe,
				     struct device *dev,
				     unsigned int cpu)
{
	struct ixgbe_fcoe_ddp_pool *ddp_pool;
	struct dma_pool *pool;
	char pool_name[32];

	snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%d", cpu);

	pool = dma_pool_create(pool_name, dev, IXGBE_FCPTR_MAX,
			       IXGBE_FCPTR_ALIGN, PAGE_SIZE);
	if (!pool)
		return -ENOMEM;

	ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
	ddp_pool->pool = pool;
	ddp_pool->noddp = 0;
	ddp_pool->noddp_ext_buff = 0;

	return 0;
}

/**
 * ixgbe_configure_fcoe - configures registers for fcoe at start
 * @adapter: ptr to ixgbe adapter
 *
 * This sets up FCoE related registers
 *
 * Returns : none
 */
void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
{
	struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
	struct ixgbe_hw *hw = &adapter->hw;
	int i, fcoe_q, fcoe_i;
	u32 etqf;

	/* Minimal functionality for FCoE requires at least CRC offloads */
	if (!(adapter->netdev->features & NETIF_F_FCOE_CRC))
		return;

	/* Enable L2 EtherType filter for FCoE, needed for FCoE CRC and DDP */
	etqf = ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN;
	if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
		etqf |= IXGBE_ETQF_POOL_ENABLE;
		etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
	}
	IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), etqf);
	IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);

	/* leave registers un-configured if FCoE is disabled */
	if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
		return;

	/* Use one or more Rx queues for FCoE by redirection table */
	for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
		fcoe_i = fcoe->offset + (i % fcoe->indices);
		fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
		fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
		IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
	}
	IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);

	/* Enable L2 EtherType filter for FIP */
	etqf = ETH_P_FIP | IXGBE_ETQF_FILTER_EN;
	if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
		etqf |= IXGBE_ETQF_POOL_ENABLE;
		etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
	}
	IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP), etqf);

	/* Send FIP frames to the first FCoE queue */
	fcoe_q = adapter->rx_ring[fcoe->offset]->reg_idx;
	IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
			IXGBE_ETQS_QUEUE_EN |
			(fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));

	/* Configure FCoE Rx control */
	IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
			IXGBE_FCRXCTRL_FCCRCBO |
			(FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
}

/**
 * ixgbe_free_fcoe_ddp_resources - release all fcoe ddp context resources
 * @adapter : ixgbe adapter
 *
 * Cleans up outstanding ddp context resources
 *
 * Returns : none
 */
void ixgbe_free_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
{
	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
	int cpu, i;

	/* do nothing if no DDP pools were allocated */
	if (!fcoe->ddp_pool)
		return;

	for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
		ixgbe_fcoe_ddp_put(adapter->netdev, i);

	for_each_possible_cpu(cpu)
		ixgbe_fcoe_dma_pool_free(fcoe, cpu);

	dma_unmap_single(&adapter->pdev->dev,
			 fcoe->extra_ddp_buffer_dma,
			 IXGBE_FCBUFF_MIN,
			 DMA_FROM_DEVICE);
	kfree(fcoe->extra_ddp_buffer);

	fcoe->extra_ddp_buffer = NULL;
	fcoe->extra_ddp_buffer_dma = 0;
}

/**
 * ixgbe_setup_fcoe_ddp_resources - setup all fcoe ddp context resources
 * @adapter: ixgbe adapter
 *
 * Sets up ddp context resouces
 *
 * Returns : 0 indicates success or -EINVAL on failure
 */
int ixgbe_setup_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
{
	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
	struct device *dev = &adapter->pdev->dev;
	void *buffer;
	dma_addr_t dma;
	unsigned int cpu;

	/* do nothing if no DDP pools were allocated */
	if (!fcoe->ddp_pool)
		return 0;

	/* Extra buffer to be shared by all DDPs for HW work around */
	buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
	if (!buffer)
		return -ENOMEM;

	dma = dma_map_single(dev, buffer, IXGBE_FCBUFF_MIN, DMA_FROM_DEVICE);
	if (dma_mapping_error(dev, dma)) {
		e_err(drv, "failed to map extra DDP buffer\n");
		kfree(buffer);
		return -ENOMEM;
	}

	fcoe->extra_ddp_buffer = buffer;
	fcoe->extra_ddp_buffer_dma = dma;

	/* allocate pci pool for each cpu */
	for_each_possible_cpu(cpu) {
		int err = ixgbe_fcoe_dma_pool_alloc(fcoe, dev, cpu);
		if (!err)
			continue;

		e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
		ixgbe_free_fcoe_ddp_resources(adapter);
		return -ENOMEM;
	}

	return 0;
}

static int ixgbe_fcoe_ddp_enable(struct ixgbe_adapter *adapter)
{
	struct ixgbe_fcoe *fcoe = &adapter->fcoe;

	if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
		return -EINVAL;

	fcoe->ddp_pool = alloc_percpu(struct ixgbe_fcoe_ddp_pool);

	if (!fcoe->ddp_pool) {
		e_err(drv, "failed to allocate percpu DDP resources\n");
		return -ENOMEM;
	}

	adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;

	return 0;
}

static void ixgbe_fcoe_ddp_disable(struct ixgbe_adapter *adapter)
{
	struct ixgbe_fcoe *fcoe = &adapter->fcoe;

	adapter->netdev->fcoe_ddp_xid = 0;

	if (!fcoe->ddp_pool)
		return;

	free_percpu(fcoe->ddp_pool);
	fcoe->ddp_pool = NULL;
}

/**
 * ixgbe_fcoe_enable - turn on FCoE offload feature
 * @netdev: the corresponding netdev
 *
 * Turns on FCoE offload feature in 82599.
 *
 * Returns : 0 indicates success or -EINVAL on failure
 */
int ixgbe_fcoe_enable(struct net_device *netdev)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);
	struct ixgbe_fcoe *fcoe = &adapter->fcoe;

	atomic_inc(&fcoe->refcnt);

	if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
		return -EINVAL;

	if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
		return -EINVAL;

	e_info(drv, "Enabling FCoE offload features.\n");

	if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
		e_warn(probe, "Enabling FCoE on PF will disable legacy VFs\n");

	if (netif_running(netdev))
		netdev->netdev_ops->ndo_stop(netdev);

	/* Allocate per CPU memory to track DDP pools */
	ixgbe_fcoe_ddp_enable(adapter);

	/* enable FCoE and notify stack */
	adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
	netdev->features |= NETIF_F_FCOE_MTU;
	netdev_features_change(netdev);

	/* release existing queues and reallocate them */
	ixgbe_clear_interrupt_scheme(adapter);
	ixgbe_init_interrupt_scheme(adapter);

	if (netif_running(netdev))
		netdev->netdev_ops->ndo_open(netdev);

	return 0;
}

/**
 * ixgbe_fcoe_disable - turn off FCoE offload feature
 * @netdev: the corresponding netdev
 *
 * Turns off FCoE offload feature in 82599.
 *
 * Returns : 0 indicates success or -EINVAL on failure
 */
int ixgbe_fcoe_disable(struct net_device *netdev)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	if (!atomic_dec_and_test(&adapter->fcoe.refcnt))
		return -EINVAL;

	if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
		return -EINVAL;

	e_info(drv, "Disabling FCoE offload features.\n");
	if (netif_running(netdev))
		netdev->netdev_ops->ndo_stop(netdev);

	/* Free per CPU memory to track DDP pools */
	ixgbe_fcoe_ddp_disable(adapter);

	/* disable FCoE and notify stack */
	adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
	netdev->features &= ~NETIF_F_FCOE_MTU;

	netdev_features_change(netdev);

	/* release existing queues and reallocate them */
	ixgbe_clear_interrupt_scheme(adapter);
	ixgbe_init_interrupt_scheme(adapter);

	if (netif_running(netdev))
		netdev->netdev_ops->ndo_open(netdev);

	return 0;
}

/**
 * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 * @netdev : ixgbe adapter
 * @wwn : the world wide name
 * @type: the type of world wide name
 *
 * Returns the node or port world wide name if both the prefix and the san
 * mac address are valid, then the wwn is formed based on the NAA-2 for
 * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 *
 * Returns : 0 on success
 */
int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
{
	int rc = -EINVAL;
	u16 prefix = 0xffff;
	struct ixgbe_adapter *adapter = netdev_priv(netdev);
	struct ixgbe_mac_info *mac = &adapter->hw.mac;

	switch (type) {
	case NETDEV_FCOE_WWNN:
		prefix = mac->wwnn_prefix;
		break;
	case NETDEV_FCOE_WWPN:
		prefix = mac->wwpn_prefix;
		break;
	default:
		break;
	}

	if ((prefix != 0xffff) &&
	    is_valid_ether_addr(mac->san_addr)) {
		*wwn = ((u64) prefix << 48) |
		       ((u64) mac->san_addr[0] << 40) |
		       ((u64) mac->san_addr[1] << 32) |
		       ((u64) mac->san_addr[2] << 24) |
		       ((u64) mac->san_addr[3] << 16) |
		       ((u64) mac->san_addr[4] << 8)  |
		       ((u64) mac->san_addr[5]);
		rc = 0;
	}
	return rc;
}

/**
 * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
 * @netdev : ixgbe adapter
 * @info : HBA information
 *
 * Returns ixgbe HBA information
 *
 * Returns : 0 on success
 */
int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
			   struct netdev_fcoe_hbainfo *info)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);
	struct ixgbe_hw *hw = &adapter->hw;
	int i, pos;
	u8 buf[8];

	if (!info)
		return -EINVAL;

	/* Don't return information on unsupported devices */
	if (hw->mac.type != ixgbe_mac_82599EB &&
	    hw->mac.type != ixgbe_mac_X540)
		return -EINVAL;

	/* Manufacturer */
	snprintf(info->manufacturer, sizeof(info->manufacturer),
		 "Intel Corporation");

	/* Serial Number */

	/* Get the PCI-e Device Serial Number Capability */
	pos = pci_find_ext_capability(adapter->pdev, PCI_EXT_CAP_ID_DSN);
	if (pos) {
		pos += 4;
		for (i = 0; i < 8; i++)
			pci_read_config_byte(adapter->pdev, pos + i, &buf[i]);

		snprintf(info->serial_number, sizeof(info->serial_number),
			 "%02X%02X%02X%02X%02X%02X%02X%02X",
			 buf[7], buf[6], buf[5], buf[4],
			 buf[3], buf[2], buf[1], buf[0]);
	} else
		snprintf(info->serial_number, sizeof(info->serial_number),
			 "Unknown");

	/* Hardware Version */
	snprintf(info->hardware_version,
		 sizeof(info->hardware_version),
		 "Rev %d", hw->revision_id);
	/* Driver Name/Version */
	snprintf(info->driver_version,
		 sizeof(info->driver_version),
		 "%s v%s",
		 ixgbe_driver_name,
		 ixgbe_driver_version);
	/* Firmware Version */
	snprintf(info->firmware_version,
		 sizeof(info->firmware_version),
		 "0x%08x",
		 (adapter->eeprom_verh << 16) |
		  adapter->eeprom_verl);

	/* Model */
	if (hw->mac.type == ixgbe_mac_82599EB) {
		snprintf(info->model,
			 sizeof(info->model),
			 "Intel 82599");
	} else {
		snprintf(info->model,
			 sizeof(info->model),
			 "Intel X540");
	}

	/* Model Description */
	snprintf(info->model_description,
		 sizeof(info->model_description),
		 "%s",
		 ixgbe_default_device_descr);

	return 0;
}

/**
 * ixgbe_fcoe_get_tc - get the current TC that fcoe is mapped to
 * @adapter - pointer to the device adapter structure
 *
 * Return : TC that FCoE is mapped to
 */
u8 ixgbe_fcoe_get_tc(struct ixgbe_adapter *adapter)
{
#ifdef CONFIG_IXGBE_DCB
	return netdev_get_prio_tc_map(adapter->netdev, adapter->fcoe.up);
#else
	return 0;
#endif
}