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1/*******************************************************************************
2
3 Intel 10 Gigabit PCI Express Linux driver
4 Copyright(c) 1999 - 2014 Intel Corporation.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Contact Information:
23 Linux NICS <linux.nics@intel.com>
24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27*******************************************************************************/
28
29#include "ixgbe.h"
30#include <linux/if_ether.h>
31#include <linux/gfp.h>
32#include <linux/if_vlan.h>
33#include <scsi/scsi_cmnd.h>
34#include <scsi/scsi_device.h>
35#include <scsi/fc/fc_fs.h>
36#include <scsi/fc/fc_fcoe.h>
37#include <scsi/libfc.h>
38#include <scsi/libfcoe.h>
39
40/**
41 * ixgbe_fcoe_clear_ddp - clear the given ddp context
42 * @ddp: ptr to the ixgbe_fcoe_ddp
43 *
44 * Returns : none
45 *
46 */
47static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
48{
49 ddp->len = 0;
50 ddp->err = 1;
51 ddp->udl = NULL;
52 ddp->udp = 0UL;
53 ddp->sgl = NULL;
54 ddp->sgc = 0;
55}
56
57/**
58 * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
59 * @netdev: the corresponding net_device
60 * @xid: the xid that corresponding ddp will be freed
61 *
62 * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
63 * and it is expected to be called by ULD, i.e., FCP layer of libfc
64 * to release the corresponding ddp context when the I/O is done.
65 *
66 * Returns : data length already ddp-ed in bytes
67 */
68int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
69{
70 int len;
71 struct ixgbe_fcoe *fcoe;
72 struct ixgbe_adapter *adapter;
73 struct ixgbe_fcoe_ddp *ddp;
74 struct ixgbe_hw *hw;
75 u32 fcbuff;
76
77 if (!netdev)
78 return 0;
79
80 if (xid >= netdev->fcoe_ddp_xid)
81 return 0;
82
83 adapter = netdev_priv(netdev);
84 fcoe = &adapter->fcoe;
85 ddp = &fcoe->ddp[xid];
86 if (!ddp->udl)
87 return 0;
88
89 hw = &adapter->hw;
90 len = ddp->len;
91 /* if no error then skip ddp context invalidation */
92 if (!ddp->err)
93 goto skip_ddpinv;
94
95 if (hw->mac.type == ixgbe_mac_X550) {
96 /* X550 does not require DDP FCoE lock */
97
98 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), 0);
99 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid),
100 (xid | IXGBE_FCFLTRW_WE));
101
102 /* program FCBUFF */
103 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), 0);
104
105 /* program FCDMARW */
106 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
107 (xid | IXGBE_FCDMARW_WE));
108
109 /* read FCBUFF to check context invalidated */
110 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
111 (xid | IXGBE_FCDMARW_RE));
112 fcbuff = IXGBE_READ_REG(hw, IXGBE_FCDDC(2, xid));
113 } else {
114 /* other hardware requires DDP FCoE lock */
115 spin_lock_bh(&fcoe->lock);
116 IXGBE_WRITE_REG(hw, IXGBE_FCFLT, 0);
117 IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW,
118 (xid | IXGBE_FCFLTRW_WE));
119 IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, 0);
120 IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
121 (xid | IXGBE_FCDMARW_WE));
122
123 /* guaranteed to be invalidated after 100us */
124 IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
125 (xid | IXGBE_FCDMARW_RE));
126 fcbuff = IXGBE_READ_REG(hw, IXGBE_FCBUFF);
127 spin_unlock_bh(&fcoe->lock);
128 }
129
130 if (fcbuff & IXGBE_FCBUFF_VALID)
131 usleep_range(100, 150);
132
133skip_ddpinv:
134 if (ddp->sgl)
135 dma_unmap_sg(&adapter->pdev->dev, ddp->sgl, ddp->sgc,
136 DMA_FROM_DEVICE);
137 if (ddp->pool) {
138 dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
139 ddp->pool = NULL;
140 }
141
142 ixgbe_fcoe_clear_ddp(ddp);
143
144 return len;
145}
146
147/**
148 * ixgbe_fcoe_ddp_setup - called to set up ddp context
149 * @netdev: the corresponding net_device
150 * @xid: the exchange id requesting ddp
151 * @sgl: the scatter-gather list for this request
152 * @sgc: the number of scatter-gather items
153 *
154 * Returns : 1 for success and 0 for no ddp
155 */
156static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
157 struct scatterlist *sgl, unsigned int sgc,
158 int target_mode)
159{
160 struct ixgbe_adapter *adapter;
161 struct ixgbe_hw *hw;
162 struct ixgbe_fcoe *fcoe;
163 struct ixgbe_fcoe_ddp *ddp;
164 struct ixgbe_fcoe_ddp_pool *ddp_pool;
165 struct scatterlist *sg;
166 unsigned int i, j, dmacount;
167 unsigned int len;
168 static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
169 unsigned int firstoff = 0;
170 unsigned int lastsize;
171 unsigned int thisoff = 0;
172 unsigned int thislen = 0;
173 u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
174 dma_addr_t addr = 0;
175
176 if (!netdev || !sgl)
177 return 0;
178
179 adapter = netdev_priv(netdev);
180 if (xid >= netdev->fcoe_ddp_xid) {
181 e_warn(drv, "xid=0x%x out-of-range\n", xid);
182 return 0;
183 }
184
185 /* no DDP if we are already down or resetting */
186 if (test_bit(__IXGBE_DOWN, &adapter->state) ||
187 test_bit(__IXGBE_RESETTING, &adapter->state))
188 return 0;
189
190 fcoe = &adapter->fcoe;
191 ddp = &fcoe->ddp[xid];
192 if (ddp->sgl) {
193 e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
194 xid, ddp->sgl, ddp->sgc);
195 return 0;
196 }
197 ixgbe_fcoe_clear_ddp(ddp);
198
199
200 if (!fcoe->ddp_pool) {
201 e_warn(drv, "No ddp_pool resources allocated\n");
202 return 0;
203 }
204
205 ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
206 if (!ddp_pool->pool) {
207 e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
208 goto out_noddp;
209 }
210
211 /* setup dma from scsi command sgl */
212 dmacount = dma_map_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
213 if (dmacount == 0) {
214 e_err(drv, "xid 0x%x DMA map error\n", xid);
215 goto out_noddp;
216 }
217
218 /* alloc the udl from per cpu ddp pool */
219 ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
220 if (!ddp->udl) {
221 e_err(drv, "failed allocated ddp context\n");
222 goto out_noddp_unmap;
223 }
224 ddp->pool = ddp_pool->pool;
225 ddp->sgl = sgl;
226 ddp->sgc = sgc;
227
228 j = 0;
229 for_each_sg(sgl, sg, dmacount, i) {
230 addr = sg_dma_address(sg);
231 len = sg_dma_len(sg);
232 while (len) {
233 /* max number of buffers allowed in one DDP context */
234 if (j >= IXGBE_BUFFCNT_MAX) {
235 ddp_pool->noddp++;
236 goto out_noddp_free;
237 }
238
239 /* get the offset of length of current buffer */
240 thisoff = addr & ((dma_addr_t)bufflen - 1);
241 thislen = min((bufflen - thisoff), len);
242 /*
243 * all but the 1st buffer (j == 0)
244 * must be aligned on bufflen
245 */
246 if ((j != 0) && (thisoff))
247 goto out_noddp_free;
248 /*
249 * all but the last buffer
250 * ((i == (dmacount - 1)) && (thislen == len))
251 * must end at bufflen
252 */
253 if (((i != (dmacount - 1)) || (thislen != len))
254 && ((thislen + thisoff) != bufflen))
255 goto out_noddp_free;
256
257 ddp->udl[j] = (u64)(addr - thisoff);
258 /* only the first buffer may have none-zero offset */
259 if (j == 0)
260 firstoff = thisoff;
261 len -= thislen;
262 addr += thislen;
263 j++;
264 }
265 }
266 /* only the last buffer may have non-full bufflen */
267 lastsize = thisoff + thislen;
268
269 /*
270 * lastsize can not be buffer len.
271 * If it is then adding another buffer with lastsize = 1.
272 */
273 if (lastsize == bufflen) {
274 if (j >= IXGBE_BUFFCNT_MAX) {
275 ddp_pool->noddp_ext_buff++;
276 goto out_noddp_free;
277 }
278
279 ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
280 j++;
281 lastsize = 1;
282 }
283 put_cpu();
284
285 fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
286 fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
287 fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
288 /* Set WRCONTX bit to allow DDP for target */
289 if (target_mode)
290 fcbuff |= (IXGBE_FCBUFF_WRCONTX);
291 fcbuff |= (IXGBE_FCBUFF_VALID);
292
293 fcdmarw = xid;
294 fcdmarw |= IXGBE_FCDMARW_WE;
295 fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
296
297 fcfltrw = xid;
298 fcfltrw |= IXGBE_FCFLTRW_WE;
299
300 /* program DMA context */
301 hw = &adapter->hw;
302
303 /* turn on last frame indication for target mode as FCP_RSPtarget is
304 * supposed to send FCP_RSP when it is done. */
305 if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
306 set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
307 fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
308 fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
309 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
310 }
311
312 if (hw->mac.type == ixgbe_mac_X550) {
313 /* X550 does not require DDP lock */
314
315 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(0, xid),
316 ddp->udp & DMA_BIT_MASK(32));
317 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(1, xid), (u64)ddp->udp >> 32);
318 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), fcbuff);
319 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid), fcdmarw);
320 /* program filter context */
321 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), IXGBE_FCFLT_VALID);
322 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(1, xid), 0);
323 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid), fcfltrw);
324 } else {
325 /* DDP lock for indirect DDP context access */
326 spin_lock_bh(&fcoe->lock);
327
328 IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
329 IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
330 IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
331 IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
332 /* program filter context */
333 IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
334 IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
335 IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
336
337 spin_unlock_bh(&fcoe->lock);
338 }
339
340 return 1;
341
342out_noddp_free:
343 dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
344 ixgbe_fcoe_clear_ddp(ddp);
345
346out_noddp_unmap:
347 dma_unmap_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
348out_noddp:
349 put_cpu();
350 return 0;
351}
352
353/**
354 * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
355 * @netdev: the corresponding net_device
356 * @xid: the exchange id requesting ddp
357 * @sgl: the scatter-gather list for this request
358 * @sgc: the number of scatter-gather items
359 *
360 * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
361 * and is expected to be called from ULD, e.g., FCP layer of libfc
362 * to set up ddp for the corresponding xid of the given sglist for
363 * the corresponding I/O.
364 *
365 * Returns : 1 for success and 0 for no ddp
366 */
367int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
368 struct scatterlist *sgl, unsigned int sgc)
369{
370 return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
371}
372
373/**
374 * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
375 * @netdev: the corresponding net_device
376 * @xid: the exchange id requesting ddp
377 * @sgl: the scatter-gather list for this request
378 * @sgc: the number of scatter-gather items
379 *
380 * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
381 * and is expected to be called from ULD, e.g., FCP layer of libfc
382 * to set up ddp for the corresponding xid of the given sglist for
383 * the corresponding I/O. The DDP in target mode is a write I/O request
384 * from the initiator.
385 *
386 * Returns : 1 for success and 0 for no ddp
387 */
388int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
389 struct scatterlist *sgl, unsigned int sgc)
390{
391 return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
392}
393
394/**
395 * ixgbe_fcoe_ddp - check ddp status and mark it done
396 * @adapter: ixgbe adapter
397 * @rx_desc: advanced rx descriptor
398 * @skb: the skb holding the received data
399 *
400 * This checks ddp status.
401 *
402 * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
403 * not passing the skb to ULD, > 0 indicates is the length of data
404 * being ddped.
405 */
406int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
407 union ixgbe_adv_rx_desc *rx_desc,
408 struct sk_buff *skb)
409{
410 int rc = -EINVAL;
411 struct ixgbe_fcoe *fcoe;
412 struct ixgbe_fcoe_ddp *ddp;
413 struct fc_frame_header *fh;
414 struct fcoe_crc_eof *crc;
415 __le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
416 __le32 ddp_err;
417 int ddp_max;
418 u32 fctl;
419 u16 xid;
420
421 if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
422 skb->ip_summed = CHECKSUM_NONE;
423 else
424 skb->ip_summed = CHECKSUM_UNNECESSARY;
425
426 if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
427 fh = (struct fc_frame_header *)(skb->data +
428 sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
429 else
430 fh = (struct fc_frame_header *)(skb->data +
431 sizeof(struct fcoe_hdr));
432
433 fctl = ntoh24(fh->fh_f_ctl);
434 if (fctl & FC_FC_EX_CTX)
435 xid = be16_to_cpu(fh->fh_ox_id);
436 else
437 xid = be16_to_cpu(fh->fh_rx_id);
438
439 ddp_max = IXGBE_FCOE_DDP_MAX;
440 /* X550 has different DDP Max limit */
441 if (adapter->hw.mac.type == ixgbe_mac_X550)
442 ddp_max = IXGBE_FCOE_DDP_MAX_X550;
443 if (xid >= ddp_max)
444 return -EINVAL;
445
446 fcoe = &adapter->fcoe;
447 ddp = &fcoe->ddp[xid];
448 if (!ddp->udl)
449 return -EINVAL;
450
451 ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
452 IXGBE_RXDADV_ERR_FCERR);
453 if (ddp_err)
454 return -EINVAL;
455
456 switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
457 /* return 0 to bypass going to ULD for DDPed data */
458 case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
459 /* update length of DDPed data */
460 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
461 rc = 0;
462 break;
463 /* unmap the sg list when FCPRSP is received */
464 case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
465 dma_unmap_sg(&adapter->pdev->dev, ddp->sgl,
466 ddp->sgc, DMA_FROM_DEVICE);
467 ddp->err = ddp_err;
468 ddp->sgl = NULL;
469 ddp->sgc = 0;
470 /* fall through */
471 /* if DDP length is present pass it through to ULD */
472 case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
473 /* update length of DDPed data */
474 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
475 if (ddp->len)
476 rc = ddp->len;
477 break;
478 /* no match will return as an error */
479 case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
480 default:
481 break;
482 }
483
484 /* In target mode, check the last data frame of the sequence.
485 * For DDP in target mode, data is already DDPed but the header
486 * indication of the last data frame ould allow is to tell if we
487 * got all the data and the ULP can send FCP_RSP back, as this is
488 * not a full fcoe frame, we fill the trailer here so it won't be
489 * dropped by the ULP stack.
490 */
491 if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
492 (fctl & FC_FC_END_SEQ)) {
493 skb_linearize(skb);
494 crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
495 crc->fcoe_eof = FC_EOF_T;
496 }
497
498 return rc;
499}
500
501/**
502 * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
503 * @tx_ring: tx desc ring
504 * @first: first tx_buffer structure containing skb, tx_flags, and protocol
505 * @hdr_len: hdr_len to be returned
506 *
507 * This sets up large send offload for FCoE
508 *
509 * Returns : 0 indicates success, < 0 for error
510 */
511int ixgbe_fso(struct ixgbe_ring *tx_ring,
512 struct ixgbe_tx_buffer *first,
513 u8 *hdr_len)
514{
515 struct sk_buff *skb = first->skb;
516 struct fc_frame_header *fh;
517 u32 vlan_macip_lens;
518 u32 fcoe_sof_eof = 0;
519 u32 mss_l4len_idx;
520 u32 type_tucmd = IXGBE_ADVTXT_TUCMD_FCOE;
521 u8 sof, eof;
522
523 if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
524 dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
525 skb_shinfo(skb)->gso_type);
526 return -EINVAL;
527 }
528
529 /* resets the header to point fcoe/fc */
530 skb_set_network_header(skb, skb->mac_len);
531 skb_set_transport_header(skb, skb->mac_len +
532 sizeof(struct fcoe_hdr));
533
534 /* sets up SOF and ORIS */
535 sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
536 switch (sof) {
537 case FC_SOF_I2:
538 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
539 break;
540 case FC_SOF_I3:
541 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
542 IXGBE_ADVTXD_FCOEF_ORIS;
543 break;
544 case FC_SOF_N2:
545 break;
546 case FC_SOF_N3:
547 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
548 break;
549 default:
550 dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
551 return -EINVAL;
552 }
553
554 /* the first byte of the last dword is EOF */
555 skb_copy_bits(skb, skb->len - 4, &eof, 1);
556 /* sets up EOF and ORIE */
557 switch (eof) {
558 case FC_EOF_N:
559 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
560 break;
561 case FC_EOF_T:
562 /* lso needs ORIE */
563 if (skb_is_gso(skb))
564 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
565 IXGBE_ADVTXD_FCOEF_ORIE;
566 else
567 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
568 break;
569 case FC_EOF_NI:
570 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
571 break;
572 case FC_EOF_A:
573 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
574 break;
575 default:
576 dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
577 return -EINVAL;
578 }
579
580 /* sets up PARINC indicating data offset */
581 fh = (struct fc_frame_header *)skb_transport_header(skb);
582 if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
583 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
584
585 /* include trailer in headlen as it is replicated per frame */
586 *hdr_len = sizeof(struct fcoe_crc_eof);
587
588 /* hdr_len includes fc_hdr if FCoE LSO is enabled */
589 if (skb_is_gso(skb)) {
590 *hdr_len += skb_transport_offset(skb) +
591 sizeof(struct fc_frame_header);
592 /* update gso_segs and bytecount */
593 first->gso_segs = DIV_ROUND_UP(skb->len - *hdr_len,
594 skb_shinfo(skb)->gso_size);
595 first->bytecount += (first->gso_segs - 1) * *hdr_len;
596 first->tx_flags |= IXGBE_TX_FLAGS_TSO;
597 /* Hardware expects L4T to be RSV for FCoE TSO */
598 type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_RSV;
599 }
600
601 /* set flag indicating FCOE to ixgbe_tx_map call */
602 first->tx_flags |= IXGBE_TX_FLAGS_FCOE | IXGBE_TX_FLAGS_CC;
603
604 /* mss_l4len_id: use 0 for FSO as TSO, no need for L4LEN */
605 mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
606
607 /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
608 vlan_macip_lens = skb_transport_offset(skb) +
609 sizeof(struct fc_frame_header);
610 vlan_macip_lens |= (skb_transport_offset(skb) - 4)
611 << IXGBE_ADVTXD_MACLEN_SHIFT;
612 vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
613
614 /* write context desc */
615 ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
616 type_tucmd, mss_l4len_idx);
617
618 return 0;
619}
620
621static void ixgbe_fcoe_dma_pool_free(struct ixgbe_fcoe *fcoe, unsigned int cpu)
622{
623 struct ixgbe_fcoe_ddp_pool *ddp_pool;
624
625 ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
626 dma_pool_destroy(ddp_pool->pool);
627 ddp_pool->pool = NULL;
628}
629
630static int ixgbe_fcoe_dma_pool_alloc(struct ixgbe_fcoe *fcoe,
631 struct device *dev,
632 unsigned int cpu)
633{
634 struct ixgbe_fcoe_ddp_pool *ddp_pool;
635 struct dma_pool *pool;
636 char pool_name[32];
637
638 snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%u", cpu);
639
640 pool = dma_pool_create(pool_name, dev, IXGBE_FCPTR_MAX,
641 IXGBE_FCPTR_ALIGN, PAGE_SIZE);
642 if (!pool)
643 return -ENOMEM;
644
645 ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
646 ddp_pool->pool = pool;
647 ddp_pool->noddp = 0;
648 ddp_pool->noddp_ext_buff = 0;
649
650 return 0;
651}
652
653/**
654 * ixgbe_configure_fcoe - configures registers for fcoe at start
655 * @adapter: ptr to ixgbe adapter
656 *
657 * This sets up FCoE related registers
658 *
659 * Returns : none
660 */
661void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
662{
663 struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
664 struct ixgbe_hw *hw = &adapter->hw;
665 int i, fcoe_q, fcoe_i, fcoe_q_h = 0;
666 int fcreta_size;
667 u32 etqf;
668
669 /* Minimal functionality for FCoE requires at least CRC offloads */
670 if (!(adapter->netdev->features & NETIF_F_FCOE_CRC))
671 return;
672
673 /* Enable L2 EtherType filter for FCoE, needed for FCoE CRC and DDP */
674 etqf = ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN;
675 if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
676 etqf |= IXGBE_ETQF_POOL_ENABLE;
677 etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
678 }
679 IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), etqf);
680 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
681
682 /* leave registers un-configured if FCoE is disabled */
683 if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
684 return;
685
686 /* Use one or more Rx queues for FCoE by redirection table */
687 fcreta_size = IXGBE_FCRETA_SIZE;
688 if (adapter->hw.mac.type == ixgbe_mac_X550)
689 fcreta_size = IXGBE_FCRETA_SIZE_X550;
690
691 for (i = 0; i < fcreta_size; i++) {
692 if (adapter->hw.mac.type == ixgbe_mac_X550) {
693 int fcoe_i_h = fcoe->offset + ((i + fcreta_size) %
694 fcoe->indices);
695 fcoe_q_h = adapter->rx_ring[fcoe_i_h]->reg_idx;
696 fcoe_q_h = (fcoe_q_h << IXGBE_FCRETA_ENTRY_HIGH_SHIFT) &
697 IXGBE_FCRETA_ENTRY_HIGH_MASK;
698 }
699
700 fcoe_i = fcoe->offset + (i % fcoe->indices);
701 fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
702 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
703 fcoe_q |= fcoe_q_h;
704 IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
705 }
706 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
707
708 /* Enable L2 EtherType filter for FIP */
709 etqf = ETH_P_FIP | IXGBE_ETQF_FILTER_EN;
710 if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
711 etqf |= IXGBE_ETQF_POOL_ENABLE;
712 etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
713 }
714 IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP), etqf);
715
716 /* Send FIP frames to the first FCoE queue */
717 fcoe_q = adapter->rx_ring[fcoe->offset]->reg_idx;
718 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
719 IXGBE_ETQS_QUEUE_EN |
720 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
721
722 /* Configure FCoE Rx control */
723 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
724 IXGBE_FCRXCTRL_FCCRCBO |
725 (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
726}
727
728/**
729 * ixgbe_free_fcoe_ddp_resources - release all fcoe ddp context resources
730 * @adapter : ixgbe adapter
731 *
732 * Cleans up outstanding ddp context resources
733 *
734 * Returns : none
735 */
736void ixgbe_free_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
737{
738 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
739 int cpu, i, ddp_max;
740
741 /* do nothing if no DDP pools were allocated */
742 if (!fcoe->ddp_pool)
743 return;
744
745 ddp_max = IXGBE_FCOE_DDP_MAX;
746 /* X550 has different DDP Max limit */
747 if (adapter->hw.mac.type == ixgbe_mac_X550)
748 ddp_max = IXGBE_FCOE_DDP_MAX_X550;
749
750 for (i = 0; i < ddp_max; i++)
751 ixgbe_fcoe_ddp_put(adapter->netdev, i);
752
753 for_each_possible_cpu(cpu)
754 ixgbe_fcoe_dma_pool_free(fcoe, cpu);
755
756 dma_unmap_single(&adapter->pdev->dev,
757 fcoe->extra_ddp_buffer_dma,
758 IXGBE_FCBUFF_MIN,
759 DMA_FROM_DEVICE);
760 kfree(fcoe->extra_ddp_buffer);
761
762 fcoe->extra_ddp_buffer = NULL;
763 fcoe->extra_ddp_buffer_dma = 0;
764}
765
766/**
767 * ixgbe_setup_fcoe_ddp_resources - setup all fcoe ddp context resources
768 * @adapter: ixgbe adapter
769 *
770 * Sets up ddp context resouces
771 *
772 * Returns : 0 indicates success or -EINVAL on failure
773 */
774int ixgbe_setup_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
775{
776 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
777 struct device *dev = &adapter->pdev->dev;
778 void *buffer;
779 dma_addr_t dma;
780 unsigned int cpu;
781
782 /* do nothing if no DDP pools were allocated */
783 if (!fcoe->ddp_pool)
784 return 0;
785
786 /* Extra buffer to be shared by all DDPs for HW work around */
787 buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
788 if (!buffer)
789 return -ENOMEM;
790
791 dma = dma_map_single(dev, buffer, IXGBE_FCBUFF_MIN, DMA_FROM_DEVICE);
792 if (dma_mapping_error(dev, dma)) {
793 e_err(drv, "failed to map extra DDP buffer\n");
794 kfree(buffer);
795 return -ENOMEM;
796 }
797
798 fcoe->extra_ddp_buffer = buffer;
799 fcoe->extra_ddp_buffer_dma = dma;
800
801 /* allocate pci pool for each cpu */
802 for_each_possible_cpu(cpu) {
803 int err = ixgbe_fcoe_dma_pool_alloc(fcoe, dev, cpu);
804 if (!err)
805 continue;
806
807 e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
808 ixgbe_free_fcoe_ddp_resources(adapter);
809 return -ENOMEM;
810 }
811
812 return 0;
813}
814
815static int ixgbe_fcoe_ddp_enable(struct ixgbe_adapter *adapter)
816{
817 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
818
819 if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
820 return -EINVAL;
821
822 fcoe->ddp_pool = alloc_percpu(struct ixgbe_fcoe_ddp_pool);
823
824 if (!fcoe->ddp_pool) {
825 e_err(drv, "failed to allocate percpu DDP resources\n");
826 return -ENOMEM;
827 }
828
829 adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
830 /* X550 has different DDP Max limit */
831 if (adapter->hw.mac.type == ixgbe_mac_X550)
832 adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX_X550 - 1;
833
834 return 0;
835}
836
837static void ixgbe_fcoe_ddp_disable(struct ixgbe_adapter *adapter)
838{
839 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
840
841 adapter->netdev->fcoe_ddp_xid = 0;
842
843 if (!fcoe->ddp_pool)
844 return;
845
846 free_percpu(fcoe->ddp_pool);
847 fcoe->ddp_pool = NULL;
848}
849
850/**
851 * ixgbe_fcoe_enable - turn on FCoE offload feature
852 * @netdev: the corresponding netdev
853 *
854 * Turns on FCoE offload feature in 82599.
855 *
856 * Returns : 0 indicates success or -EINVAL on failure
857 */
858int ixgbe_fcoe_enable(struct net_device *netdev)
859{
860 struct ixgbe_adapter *adapter = netdev_priv(netdev);
861 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
862
863 atomic_inc(&fcoe->refcnt);
864
865 if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
866 return -EINVAL;
867
868 if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
869 return -EINVAL;
870
871 e_info(drv, "Enabling FCoE offload features.\n");
872
873 if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
874 e_warn(probe, "Enabling FCoE on PF will disable legacy VFs\n");
875
876 if (netif_running(netdev))
877 netdev->netdev_ops->ndo_stop(netdev);
878
879 /* Allocate per CPU memory to track DDP pools */
880 ixgbe_fcoe_ddp_enable(adapter);
881
882 /* enable FCoE and notify stack */
883 adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
884 netdev->features |= NETIF_F_FCOE_MTU;
885 netdev_features_change(netdev);
886
887 /* release existing queues and reallocate them */
888 ixgbe_clear_interrupt_scheme(adapter);
889 ixgbe_init_interrupt_scheme(adapter);
890
891 if (netif_running(netdev))
892 netdev->netdev_ops->ndo_open(netdev);
893
894 return 0;
895}
896
897/**
898 * ixgbe_fcoe_disable - turn off FCoE offload feature
899 * @netdev: the corresponding netdev
900 *
901 * Turns off FCoE offload feature in 82599.
902 *
903 * Returns : 0 indicates success or -EINVAL on failure
904 */
905int ixgbe_fcoe_disable(struct net_device *netdev)
906{
907 struct ixgbe_adapter *adapter = netdev_priv(netdev);
908
909 if (!atomic_dec_and_test(&adapter->fcoe.refcnt))
910 return -EINVAL;
911
912 if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
913 return -EINVAL;
914
915 e_info(drv, "Disabling FCoE offload features.\n");
916 if (netif_running(netdev))
917 netdev->netdev_ops->ndo_stop(netdev);
918
919 /* Free per CPU memory to track DDP pools */
920 ixgbe_fcoe_ddp_disable(adapter);
921
922 /* disable FCoE and notify stack */
923 adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
924 netdev->features &= ~NETIF_F_FCOE_MTU;
925
926 netdev_features_change(netdev);
927
928 /* release existing queues and reallocate them */
929 ixgbe_clear_interrupt_scheme(adapter);
930 ixgbe_init_interrupt_scheme(adapter);
931
932 if (netif_running(netdev))
933 netdev->netdev_ops->ndo_open(netdev);
934
935 return 0;
936}
937
938/**
939 * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
940 * @netdev : ixgbe adapter
941 * @wwn : the world wide name
942 * @type: the type of world wide name
943 *
944 * Returns the node or port world wide name if both the prefix and the san
945 * mac address are valid, then the wwn is formed based on the NAA-2 for
946 * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
947 *
948 * Returns : 0 on success
949 */
950int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
951{
952 u16 prefix = 0xffff;
953 struct ixgbe_adapter *adapter = netdev_priv(netdev);
954 struct ixgbe_mac_info *mac = &adapter->hw.mac;
955
956 switch (type) {
957 case NETDEV_FCOE_WWNN:
958 prefix = mac->wwnn_prefix;
959 break;
960 case NETDEV_FCOE_WWPN:
961 prefix = mac->wwpn_prefix;
962 break;
963 default:
964 break;
965 }
966
967 if ((prefix != 0xffff) &&
968 is_valid_ether_addr(mac->san_addr)) {
969 *wwn = ((u64) prefix << 48) |
970 ((u64) mac->san_addr[0] << 40) |
971 ((u64) mac->san_addr[1] << 32) |
972 ((u64) mac->san_addr[2] << 24) |
973 ((u64) mac->san_addr[3] << 16) |
974 ((u64) mac->san_addr[4] << 8) |
975 ((u64) mac->san_addr[5]);
976 return 0;
977 }
978 return -EINVAL;
979}
980
981/**
982 * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
983 * @netdev : ixgbe adapter
984 * @info : HBA information
985 *
986 * Returns ixgbe HBA information
987 *
988 * Returns : 0 on success
989 */
990int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
991 struct netdev_fcoe_hbainfo *info)
992{
993 struct ixgbe_adapter *adapter = netdev_priv(netdev);
994 struct ixgbe_hw *hw = &adapter->hw;
995 int i, pos;
996 u8 buf[8];
997
998 if (!info)
999 return -EINVAL;
1000
1001 /* Don't return information on unsupported devices */
1002 if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
1003 return -EINVAL;
1004
1005 /* Manufacturer */
1006 snprintf(info->manufacturer, sizeof(info->manufacturer),
1007 "Intel Corporation");
1008
1009 /* Serial Number */
1010
1011 /* Get the PCI-e Device Serial Number Capability */
1012 pos = pci_find_ext_capability(adapter->pdev, PCI_EXT_CAP_ID_DSN);
1013 if (pos) {
1014 pos += 4;
1015 for (i = 0; i < 8; i++)
1016 pci_read_config_byte(adapter->pdev, pos + i, &buf[i]);
1017
1018 snprintf(info->serial_number, sizeof(info->serial_number),
1019 "%02X%02X%02X%02X%02X%02X%02X%02X",
1020 buf[7], buf[6], buf[5], buf[4],
1021 buf[3], buf[2], buf[1], buf[0]);
1022 } else
1023 snprintf(info->serial_number, sizeof(info->serial_number),
1024 "Unknown");
1025
1026 /* Hardware Version */
1027 snprintf(info->hardware_version,
1028 sizeof(info->hardware_version),
1029 "Rev %d", hw->revision_id);
1030 /* Driver Name/Version */
1031 snprintf(info->driver_version,
1032 sizeof(info->driver_version),
1033 "%s v%s",
1034 ixgbe_driver_name,
1035 ixgbe_driver_version);
1036 /* Firmware Version */
1037 snprintf(info->firmware_version,
1038 sizeof(info->firmware_version),
1039 "0x%08x",
1040 (adapter->eeprom_verh << 16) |
1041 adapter->eeprom_verl);
1042
1043 /* Model */
1044 if (hw->mac.type == ixgbe_mac_82599EB) {
1045 snprintf(info->model,
1046 sizeof(info->model),
1047 "Intel 82599");
1048 } else if (hw->mac.type == ixgbe_mac_X550) {
1049 snprintf(info->model,
1050 sizeof(info->model),
1051 "Intel X550");
1052 } else {
1053 snprintf(info->model,
1054 sizeof(info->model),
1055 "Intel X540");
1056 }
1057
1058 /* Model Description */
1059 snprintf(info->model_description,
1060 sizeof(info->model_description),
1061 "%s",
1062 ixgbe_default_device_descr);
1063
1064 return 0;
1065}
1066
1067/**
1068 * ixgbe_fcoe_get_tc - get the current TC that fcoe is mapped to
1069 * @adapter - pointer to the device adapter structure
1070 *
1071 * Return : TC that FCoE is mapped to
1072 */
1073u8 ixgbe_fcoe_get_tc(struct ixgbe_adapter *adapter)
1074{
1075#ifdef CONFIG_IXGBE_DCB
1076 return netdev_get_prio_tc_map(adapter->netdev, adapter->fcoe.up);
1077#else
1078 return 0;
1079#endif
1080}