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1/*******************************************************************************
2
3 Intel 10 Gigabit PCI Express Linux driver
4 Copyright(c) 1999 - 2013 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 = 0;
71 struct ixgbe_fcoe *fcoe;
72 struct ixgbe_adapter *adapter;
73 struct ixgbe_fcoe_ddp *ddp;
74 u32 fcbuff;
75
76 if (!netdev)
77 goto out_ddp_put;
78
79 if (xid >= IXGBE_FCOE_DDP_MAX)
80 goto out_ddp_put;
81
82 adapter = netdev_priv(netdev);
83 fcoe = &adapter->fcoe;
84 ddp = &fcoe->ddp[xid];
85 if (!ddp->udl)
86 goto out_ddp_put;
87
88 len = ddp->len;
89 /* if there an error, force to invalidate ddp context */
90 if (ddp->err) {
91 spin_lock_bh(&fcoe->lock);
92 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLT, 0);
93 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLTRW,
94 (xid | IXGBE_FCFLTRW_WE));
95 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCBUFF, 0);
96 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
97 (xid | IXGBE_FCDMARW_WE));
98
99 /* guaranteed to be invalidated after 100us */
100 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
101 (xid | IXGBE_FCDMARW_RE));
102 fcbuff = IXGBE_READ_REG(&adapter->hw, IXGBE_FCBUFF);
103 spin_unlock_bh(&fcoe->lock);
104 if (fcbuff & IXGBE_FCBUFF_VALID)
105 udelay(100);
106 }
107 if (ddp->sgl)
108 dma_unmap_sg(&adapter->pdev->dev, ddp->sgl, ddp->sgc,
109 DMA_FROM_DEVICE);
110 if (ddp->pool) {
111 dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
112 ddp->pool = NULL;
113 }
114
115 ixgbe_fcoe_clear_ddp(ddp);
116
117out_ddp_put:
118 return len;
119}
120
121/**
122 * ixgbe_fcoe_ddp_setup - called to set up ddp context
123 * @netdev: the corresponding net_device
124 * @xid: the exchange id requesting ddp
125 * @sgl: the scatter-gather list for this request
126 * @sgc: the number of scatter-gather items
127 *
128 * Returns : 1 for success and 0 for no ddp
129 */
130static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
131 struct scatterlist *sgl, unsigned int sgc,
132 int target_mode)
133{
134 struct ixgbe_adapter *adapter;
135 struct ixgbe_hw *hw;
136 struct ixgbe_fcoe *fcoe;
137 struct ixgbe_fcoe_ddp *ddp;
138 struct ixgbe_fcoe_ddp_pool *ddp_pool;
139 struct scatterlist *sg;
140 unsigned int i, j, dmacount;
141 unsigned int len;
142 static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
143 unsigned int firstoff = 0;
144 unsigned int lastsize;
145 unsigned int thisoff = 0;
146 unsigned int thislen = 0;
147 u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
148 dma_addr_t addr = 0;
149
150 if (!netdev || !sgl)
151 return 0;
152
153 adapter = netdev_priv(netdev);
154 if (xid >= IXGBE_FCOE_DDP_MAX) {
155 e_warn(drv, "xid=0x%x out-of-range\n", xid);
156 return 0;
157 }
158
159 /* no DDP if we are already down or resetting */
160 if (test_bit(__IXGBE_DOWN, &adapter->state) ||
161 test_bit(__IXGBE_RESETTING, &adapter->state))
162 return 0;
163
164 fcoe = &adapter->fcoe;
165 ddp = &fcoe->ddp[xid];
166 if (ddp->sgl) {
167 e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
168 xid, ddp->sgl, ddp->sgc);
169 return 0;
170 }
171 ixgbe_fcoe_clear_ddp(ddp);
172
173
174 if (!fcoe->ddp_pool) {
175 e_warn(drv, "No ddp_pool resources allocated\n");
176 return 0;
177 }
178
179 ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
180 if (!ddp_pool->pool) {
181 e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
182 goto out_noddp;
183 }
184
185 /* setup dma from scsi command sgl */
186 dmacount = dma_map_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
187 if (dmacount == 0) {
188 e_err(drv, "xid 0x%x DMA map error\n", xid);
189 goto out_noddp;
190 }
191
192 /* alloc the udl from per cpu ddp pool */
193 ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
194 if (!ddp->udl) {
195 e_err(drv, "failed allocated ddp context\n");
196 goto out_noddp_unmap;
197 }
198 ddp->pool = ddp_pool->pool;
199 ddp->sgl = sgl;
200 ddp->sgc = sgc;
201
202 j = 0;
203 for_each_sg(sgl, sg, dmacount, i) {
204 addr = sg_dma_address(sg);
205 len = sg_dma_len(sg);
206 while (len) {
207 /* max number of buffers allowed in one DDP context */
208 if (j >= IXGBE_BUFFCNT_MAX) {
209 ddp_pool->noddp++;
210 goto out_noddp_free;
211 }
212
213 /* get the offset of length of current buffer */
214 thisoff = addr & ((dma_addr_t)bufflen - 1);
215 thislen = min((bufflen - thisoff), len);
216 /*
217 * all but the 1st buffer (j == 0)
218 * must be aligned on bufflen
219 */
220 if ((j != 0) && (thisoff))
221 goto out_noddp_free;
222 /*
223 * all but the last buffer
224 * ((i == (dmacount - 1)) && (thislen == len))
225 * must end at bufflen
226 */
227 if (((i != (dmacount - 1)) || (thislen != len))
228 && ((thislen + thisoff) != bufflen))
229 goto out_noddp_free;
230
231 ddp->udl[j] = (u64)(addr - thisoff);
232 /* only the first buffer may have none-zero offset */
233 if (j == 0)
234 firstoff = thisoff;
235 len -= thislen;
236 addr += thislen;
237 j++;
238 }
239 }
240 /* only the last buffer may have non-full bufflen */
241 lastsize = thisoff + thislen;
242
243 /*
244 * lastsize can not be buffer len.
245 * If it is then adding another buffer with lastsize = 1.
246 */
247 if (lastsize == bufflen) {
248 if (j >= IXGBE_BUFFCNT_MAX) {
249 ddp_pool->noddp_ext_buff++;
250 goto out_noddp_free;
251 }
252
253 ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
254 j++;
255 lastsize = 1;
256 }
257 put_cpu();
258
259 fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
260 fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
261 fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
262 /* Set WRCONTX bit to allow DDP for target */
263 if (target_mode)
264 fcbuff |= (IXGBE_FCBUFF_WRCONTX);
265 fcbuff |= (IXGBE_FCBUFF_VALID);
266
267 fcdmarw = xid;
268 fcdmarw |= IXGBE_FCDMARW_WE;
269 fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
270
271 fcfltrw = xid;
272 fcfltrw |= IXGBE_FCFLTRW_WE;
273
274 /* program DMA context */
275 hw = &adapter->hw;
276 spin_lock_bh(&fcoe->lock);
277
278 /* turn on last frame indication for target mode as FCP_RSPtarget is
279 * supposed to send FCP_RSP when it is done. */
280 if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
281 set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
282 fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
283 fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
284 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
285 }
286
287 IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
288 IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
289 IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
290 IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
291 /* program filter context */
292 IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
293 IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
294 IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
295
296 spin_unlock_bh(&fcoe->lock);
297
298 return 1;
299
300out_noddp_free:
301 dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
302 ixgbe_fcoe_clear_ddp(ddp);
303
304out_noddp_unmap:
305 dma_unmap_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
306out_noddp:
307 put_cpu();
308 return 0;
309}
310
311/**
312 * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
313 * @netdev: the corresponding net_device
314 * @xid: the exchange id requesting ddp
315 * @sgl: the scatter-gather list for this request
316 * @sgc: the number of scatter-gather items
317 *
318 * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
319 * and is expected to be called from ULD, e.g., FCP layer of libfc
320 * to set up ddp for the corresponding xid of the given sglist for
321 * the corresponding I/O.
322 *
323 * Returns : 1 for success and 0 for no ddp
324 */
325int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
326 struct scatterlist *sgl, unsigned int sgc)
327{
328 return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
329}
330
331/**
332 * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
333 * @netdev: the corresponding net_device
334 * @xid: the exchange id requesting ddp
335 * @sgl: the scatter-gather list for this request
336 * @sgc: the number of scatter-gather items
337 *
338 * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
339 * and is expected to be called from ULD, e.g., FCP layer of libfc
340 * to set up ddp for the corresponding xid of the given sglist for
341 * the corresponding I/O. The DDP in target mode is a write I/O request
342 * from the initiator.
343 *
344 * Returns : 1 for success and 0 for no ddp
345 */
346int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
347 struct scatterlist *sgl, unsigned int sgc)
348{
349 return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
350}
351
352/**
353 * ixgbe_fcoe_ddp - check ddp status and mark it done
354 * @adapter: ixgbe adapter
355 * @rx_desc: advanced rx descriptor
356 * @skb: the skb holding the received data
357 *
358 * This checks ddp status.
359 *
360 * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
361 * not passing the skb to ULD, > 0 indicates is the length of data
362 * being ddped.
363 */
364int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
365 union ixgbe_adv_rx_desc *rx_desc,
366 struct sk_buff *skb)
367{
368 int rc = -EINVAL;
369 struct ixgbe_fcoe *fcoe;
370 struct ixgbe_fcoe_ddp *ddp;
371 struct fc_frame_header *fh;
372 struct fcoe_crc_eof *crc;
373 __le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
374 __le32 ddp_err;
375 u32 fctl;
376 u16 xid;
377
378 if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
379 skb->ip_summed = CHECKSUM_NONE;
380 else
381 skb->ip_summed = CHECKSUM_UNNECESSARY;
382
383 if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
384 fh = (struct fc_frame_header *)(skb->data +
385 sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
386 else
387 fh = (struct fc_frame_header *)(skb->data +
388 sizeof(struct fcoe_hdr));
389
390 fctl = ntoh24(fh->fh_f_ctl);
391 if (fctl & FC_FC_EX_CTX)
392 xid = be16_to_cpu(fh->fh_ox_id);
393 else
394 xid = be16_to_cpu(fh->fh_rx_id);
395
396 if (xid >= IXGBE_FCOE_DDP_MAX)
397 goto ddp_out;
398
399 fcoe = &adapter->fcoe;
400 ddp = &fcoe->ddp[xid];
401 if (!ddp->udl)
402 goto ddp_out;
403
404 ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
405 IXGBE_RXDADV_ERR_FCERR);
406 if (ddp_err)
407 goto ddp_out;
408
409 switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
410 /* return 0 to bypass going to ULD for DDPed data */
411 case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
412 /* update length of DDPed data */
413 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
414 rc = 0;
415 break;
416 /* unmap the sg list when FCPRSP is received */
417 case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
418 dma_unmap_sg(&adapter->pdev->dev, ddp->sgl,
419 ddp->sgc, DMA_FROM_DEVICE);
420 ddp->err = ddp_err;
421 ddp->sgl = NULL;
422 ddp->sgc = 0;
423 /* fall through */
424 /* if DDP length is present pass it through to ULD */
425 case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
426 /* update length of DDPed data */
427 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
428 if (ddp->len)
429 rc = ddp->len;
430 break;
431 /* no match will return as an error */
432 case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
433 default:
434 break;
435 }
436
437 /* In target mode, check the last data frame of the sequence.
438 * For DDP in target mode, data is already DDPed but the header
439 * indication of the last data frame ould allow is to tell if we
440 * got all the data and the ULP can send FCP_RSP back, as this is
441 * not a full fcoe frame, we fill the trailer here so it won't be
442 * dropped by the ULP stack.
443 */
444 if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
445 (fctl & FC_FC_END_SEQ)) {
446 skb_linearize(skb);
447 crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
448 crc->fcoe_eof = FC_EOF_T;
449 }
450ddp_out:
451 return rc;
452}
453
454/**
455 * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
456 * @tx_ring: tx desc ring
457 * @first: first tx_buffer structure containing skb, tx_flags, and protocol
458 * @hdr_len: hdr_len to be returned
459 *
460 * This sets up large send offload for FCoE
461 *
462 * Returns : 0 indicates success, < 0 for error
463 */
464int ixgbe_fso(struct ixgbe_ring *tx_ring,
465 struct ixgbe_tx_buffer *first,
466 u8 *hdr_len)
467{
468 struct sk_buff *skb = first->skb;
469 struct fc_frame_header *fh;
470 u32 vlan_macip_lens;
471 u32 fcoe_sof_eof = 0;
472 u32 mss_l4len_idx;
473 u8 sof, eof;
474
475 if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
476 dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
477 skb_shinfo(skb)->gso_type);
478 return -EINVAL;
479 }
480
481 /* resets the header to point fcoe/fc */
482 skb_set_network_header(skb, skb->mac_len);
483 skb_set_transport_header(skb, skb->mac_len +
484 sizeof(struct fcoe_hdr));
485
486 /* sets up SOF and ORIS */
487 sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
488 switch (sof) {
489 case FC_SOF_I2:
490 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
491 break;
492 case FC_SOF_I3:
493 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
494 IXGBE_ADVTXD_FCOEF_ORIS;
495 break;
496 case FC_SOF_N2:
497 break;
498 case FC_SOF_N3:
499 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
500 break;
501 default:
502 dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
503 return -EINVAL;
504 }
505
506 /* the first byte of the last dword is EOF */
507 skb_copy_bits(skb, skb->len - 4, &eof, 1);
508 /* sets up EOF and ORIE */
509 switch (eof) {
510 case FC_EOF_N:
511 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
512 break;
513 case FC_EOF_T:
514 /* lso needs ORIE */
515 if (skb_is_gso(skb))
516 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
517 IXGBE_ADVTXD_FCOEF_ORIE;
518 else
519 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
520 break;
521 case FC_EOF_NI:
522 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
523 break;
524 case FC_EOF_A:
525 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
526 break;
527 default:
528 dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
529 return -EINVAL;
530 }
531
532 /* sets up PARINC indicating data offset */
533 fh = (struct fc_frame_header *)skb_transport_header(skb);
534 if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
535 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
536
537 /* include trailer in headlen as it is replicated per frame */
538 *hdr_len = sizeof(struct fcoe_crc_eof);
539
540 /* hdr_len includes fc_hdr if FCoE LSO is enabled */
541 if (skb_is_gso(skb)) {
542 *hdr_len += skb_transport_offset(skb) +
543 sizeof(struct fc_frame_header);
544 /* update gso_segs and bytecount */
545 first->gso_segs = DIV_ROUND_UP(skb->len - *hdr_len,
546 skb_shinfo(skb)->gso_size);
547 first->bytecount += (first->gso_segs - 1) * *hdr_len;
548 first->tx_flags |= IXGBE_TX_FLAGS_TSO;
549 }
550
551 /* set flag indicating FCOE to ixgbe_tx_map call */
552 first->tx_flags |= IXGBE_TX_FLAGS_FCOE | IXGBE_TX_FLAGS_CC;
553
554 /* mss_l4len_id: use 0 for FSO as TSO, no need for L4LEN */
555 mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
556
557 /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
558 vlan_macip_lens = skb_transport_offset(skb) +
559 sizeof(struct fc_frame_header);
560 vlan_macip_lens |= (skb_transport_offset(skb) - 4)
561 << IXGBE_ADVTXD_MACLEN_SHIFT;
562 vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
563
564 /* write context desc */
565 ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
566 IXGBE_ADVTXT_TUCMD_FCOE, mss_l4len_idx);
567
568 return 0;
569}
570
571static void ixgbe_fcoe_dma_pool_free(struct ixgbe_fcoe *fcoe, unsigned int cpu)
572{
573 struct ixgbe_fcoe_ddp_pool *ddp_pool;
574
575 ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
576 if (ddp_pool->pool)
577 dma_pool_destroy(ddp_pool->pool);
578 ddp_pool->pool = NULL;
579}
580
581static int ixgbe_fcoe_dma_pool_alloc(struct ixgbe_fcoe *fcoe,
582 struct device *dev,
583 unsigned int cpu)
584{
585 struct ixgbe_fcoe_ddp_pool *ddp_pool;
586 struct dma_pool *pool;
587 char pool_name[32];
588
589 snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%u", cpu);
590
591 pool = dma_pool_create(pool_name, dev, IXGBE_FCPTR_MAX,
592 IXGBE_FCPTR_ALIGN, PAGE_SIZE);
593 if (!pool)
594 return -ENOMEM;
595
596 ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
597 ddp_pool->pool = pool;
598 ddp_pool->noddp = 0;
599 ddp_pool->noddp_ext_buff = 0;
600
601 return 0;
602}
603
604/**
605 * ixgbe_configure_fcoe - configures registers for fcoe at start
606 * @adapter: ptr to ixgbe adapter
607 *
608 * This sets up FCoE related registers
609 *
610 * Returns : none
611 */
612void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
613{
614 struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
615 struct ixgbe_hw *hw = &adapter->hw;
616 int i, fcoe_q, fcoe_i;
617 u32 etqf;
618
619 /* Minimal functionality for FCoE requires at least CRC offloads */
620 if (!(adapter->netdev->features & NETIF_F_FCOE_CRC))
621 return;
622
623 /* Enable L2 EtherType filter for FCoE, needed for FCoE CRC and DDP */
624 etqf = ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN;
625 if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
626 etqf |= IXGBE_ETQF_POOL_ENABLE;
627 etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
628 }
629 IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), etqf);
630 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
631
632 /* leave registers un-configured if FCoE is disabled */
633 if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
634 return;
635
636 /* Use one or more Rx queues for FCoE by redirection table */
637 for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
638 fcoe_i = fcoe->offset + (i % fcoe->indices);
639 fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
640 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
641 IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
642 }
643 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
644
645 /* Enable L2 EtherType filter for FIP */
646 etqf = ETH_P_FIP | IXGBE_ETQF_FILTER_EN;
647 if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
648 etqf |= IXGBE_ETQF_POOL_ENABLE;
649 etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
650 }
651 IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP), etqf);
652
653 /* Send FIP frames to the first FCoE queue */
654 fcoe_q = adapter->rx_ring[fcoe->offset]->reg_idx;
655 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
656 IXGBE_ETQS_QUEUE_EN |
657 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
658
659 /* Configure FCoE Rx control */
660 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
661 IXGBE_FCRXCTRL_FCCRCBO |
662 (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
663}
664
665/**
666 * ixgbe_free_fcoe_ddp_resources - release all fcoe ddp context resources
667 * @adapter : ixgbe adapter
668 *
669 * Cleans up outstanding ddp context resources
670 *
671 * Returns : none
672 */
673void ixgbe_free_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
674{
675 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
676 int cpu, i;
677
678 /* do nothing if no DDP pools were allocated */
679 if (!fcoe->ddp_pool)
680 return;
681
682 for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
683 ixgbe_fcoe_ddp_put(adapter->netdev, i);
684
685 for_each_possible_cpu(cpu)
686 ixgbe_fcoe_dma_pool_free(fcoe, cpu);
687
688 dma_unmap_single(&adapter->pdev->dev,
689 fcoe->extra_ddp_buffer_dma,
690 IXGBE_FCBUFF_MIN,
691 DMA_FROM_DEVICE);
692 kfree(fcoe->extra_ddp_buffer);
693
694 fcoe->extra_ddp_buffer = NULL;
695 fcoe->extra_ddp_buffer_dma = 0;
696}
697
698/**
699 * ixgbe_setup_fcoe_ddp_resources - setup all fcoe ddp context resources
700 * @adapter: ixgbe adapter
701 *
702 * Sets up ddp context resouces
703 *
704 * Returns : 0 indicates success or -EINVAL on failure
705 */
706int ixgbe_setup_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
707{
708 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
709 struct device *dev = &adapter->pdev->dev;
710 void *buffer;
711 dma_addr_t dma;
712 unsigned int cpu;
713
714 /* do nothing if no DDP pools were allocated */
715 if (!fcoe->ddp_pool)
716 return 0;
717
718 /* Extra buffer to be shared by all DDPs for HW work around */
719 buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
720 if (!buffer)
721 return -ENOMEM;
722
723 dma = dma_map_single(dev, buffer, IXGBE_FCBUFF_MIN, DMA_FROM_DEVICE);
724 if (dma_mapping_error(dev, dma)) {
725 e_err(drv, "failed to map extra DDP buffer\n");
726 kfree(buffer);
727 return -ENOMEM;
728 }
729
730 fcoe->extra_ddp_buffer = buffer;
731 fcoe->extra_ddp_buffer_dma = dma;
732
733 /* allocate pci pool for each cpu */
734 for_each_possible_cpu(cpu) {
735 int err = ixgbe_fcoe_dma_pool_alloc(fcoe, dev, cpu);
736 if (!err)
737 continue;
738
739 e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
740 ixgbe_free_fcoe_ddp_resources(adapter);
741 return -ENOMEM;
742 }
743
744 return 0;
745}
746
747static int ixgbe_fcoe_ddp_enable(struct ixgbe_adapter *adapter)
748{
749 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
750
751 if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
752 return -EINVAL;
753
754 fcoe->ddp_pool = alloc_percpu(struct ixgbe_fcoe_ddp_pool);
755
756 if (!fcoe->ddp_pool) {
757 e_err(drv, "failed to allocate percpu DDP resources\n");
758 return -ENOMEM;
759 }
760
761 adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
762
763 return 0;
764}
765
766static void ixgbe_fcoe_ddp_disable(struct ixgbe_adapter *adapter)
767{
768 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
769
770 adapter->netdev->fcoe_ddp_xid = 0;
771
772 if (!fcoe->ddp_pool)
773 return;
774
775 free_percpu(fcoe->ddp_pool);
776 fcoe->ddp_pool = NULL;
777}
778
779/**
780 * ixgbe_fcoe_enable - turn on FCoE offload feature
781 * @netdev: the corresponding netdev
782 *
783 * Turns on FCoE offload feature in 82599.
784 *
785 * Returns : 0 indicates success or -EINVAL on failure
786 */
787int ixgbe_fcoe_enable(struct net_device *netdev)
788{
789 struct ixgbe_adapter *adapter = netdev_priv(netdev);
790 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
791
792 atomic_inc(&fcoe->refcnt);
793
794 if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
795 return -EINVAL;
796
797 if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
798 return -EINVAL;
799
800 e_info(drv, "Enabling FCoE offload features.\n");
801
802 if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
803 e_warn(probe, "Enabling FCoE on PF will disable legacy VFs\n");
804
805 if (netif_running(netdev))
806 netdev->netdev_ops->ndo_stop(netdev);
807
808 /* Allocate per CPU memory to track DDP pools */
809 ixgbe_fcoe_ddp_enable(adapter);
810
811 /* enable FCoE and notify stack */
812 adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
813 netdev->features |= NETIF_F_FCOE_MTU;
814 netdev_features_change(netdev);
815
816 /* release existing queues and reallocate them */
817 ixgbe_clear_interrupt_scheme(adapter);
818 ixgbe_init_interrupt_scheme(adapter);
819
820 if (netif_running(netdev))
821 netdev->netdev_ops->ndo_open(netdev);
822
823 return 0;
824}
825
826/**
827 * ixgbe_fcoe_disable - turn off FCoE offload feature
828 * @netdev: the corresponding netdev
829 *
830 * Turns off FCoE offload feature in 82599.
831 *
832 * Returns : 0 indicates success or -EINVAL on failure
833 */
834int ixgbe_fcoe_disable(struct net_device *netdev)
835{
836 struct ixgbe_adapter *adapter = netdev_priv(netdev);
837
838 if (!atomic_dec_and_test(&adapter->fcoe.refcnt))
839 return -EINVAL;
840
841 if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
842 return -EINVAL;
843
844 e_info(drv, "Disabling FCoE offload features.\n");
845 if (netif_running(netdev))
846 netdev->netdev_ops->ndo_stop(netdev);
847
848 /* Free per CPU memory to track DDP pools */
849 ixgbe_fcoe_ddp_disable(adapter);
850
851 /* disable FCoE and notify stack */
852 adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
853 netdev->features &= ~NETIF_F_FCOE_MTU;
854
855 netdev_features_change(netdev);
856
857 /* release existing queues and reallocate them */
858 ixgbe_clear_interrupt_scheme(adapter);
859 ixgbe_init_interrupt_scheme(adapter);
860
861 if (netif_running(netdev))
862 netdev->netdev_ops->ndo_open(netdev);
863
864 return 0;
865}
866
867/**
868 * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
869 * @netdev : ixgbe adapter
870 * @wwn : the world wide name
871 * @type: the type of world wide name
872 *
873 * Returns the node or port world wide name if both the prefix and the san
874 * mac address are valid, then the wwn is formed based on the NAA-2 for
875 * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
876 *
877 * Returns : 0 on success
878 */
879int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
880{
881 int rc = -EINVAL;
882 u16 prefix = 0xffff;
883 struct ixgbe_adapter *adapter = netdev_priv(netdev);
884 struct ixgbe_mac_info *mac = &adapter->hw.mac;
885
886 switch (type) {
887 case NETDEV_FCOE_WWNN:
888 prefix = mac->wwnn_prefix;
889 break;
890 case NETDEV_FCOE_WWPN:
891 prefix = mac->wwpn_prefix;
892 break;
893 default:
894 break;
895 }
896
897 if ((prefix != 0xffff) &&
898 is_valid_ether_addr(mac->san_addr)) {
899 *wwn = ((u64) prefix << 48) |
900 ((u64) mac->san_addr[0] << 40) |
901 ((u64) mac->san_addr[1] << 32) |
902 ((u64) mac->san_addr[2] << 24) |
903 ((u64) mac->san_addr[3] << 16) |
904 ((u64) mac->san_addr[4] << 8) |
905 ((u64) mac->san_addr[5]);
906 rc = 0;
907 }
908 return rc;
909}
910
911/**
912 * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
913 * @netdev : ixgbe adapter
914 * @info : HBA information
915 *
916 * Returns ixgbe HBA information
917 *
918 * Returns : 0 on success
919 */
920int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
921 struct netdev_fcoe_hbainfo *info)
922{
923 struct ixgbe_adapter *adapter = netdev_priv(netdev);
924 struct ixgbe_hw *hw = &adapter->hw;
925 int i, pos;
926 u8 buf[8];
927
928 if (!info)
929 return -EINVAL;
930
931 /* Don't return information on unsupported devices */
932 if (hw->mac.type != ixgbe_mac_82599EB &&
933 hw->mac.type != ixgbe_mac_X540)
934 return -EINVAL;
935
936 /* Manufacturer */
937 snprintf(info->manufacturer, sizeof(info->manufacturer),
938 "Intel Corporation");
939
940 /* Serial Number */
941
942 /* Get the PCI-e Device Serial Number Capability */
943 pos = pci_find_ext_capability(adapter->pdev, PCI_EXT_CAP_ID_DSN);
944 if (pos) {
945 pos += 4;
946 for (i = 0; i < 8; i++)
947 pci_read_config_byte(adapter->pdev, pos + i, &buf[i]);
948
949 snprintf(info->serial_number, sizeof(info->serial_number),
950 "%02X%02X%02X%02X%02X%02X%02X%02X",
951 buf[7], buf[6], buf[5], buf[4],
952 buf[3], buf[2], buf[1], buf[0]);
953 } else
954 snprintf(info->serial_number, sizeof(info->serial_number),
955 "Unknown");
956
957 /* Hardware Version */
958 snprintf(info->hardware_version,
959 sizeof(info->hardware_version),
960 "Rev %d", hw->revision_id);
961 /* Driver Name/Version */
962 snprintf(info->driver_version,
963 sizeof(info->driver_version),
964 "%s v%s",
965 ixgbe_driver_name,
966 ixgbe_driver_version);
967 /* Firmware Version */
968 snprintf(info->firmware_version,
969 sizeof(info->firmware_version),
970 "0x%08x",
971 (adapter->eeprom_verh << 16) |
972 adapter->eeprom_verl);
973
974 /* Model */
975 if (hw->mac.type == ixgbe_mac_82599EB) {
976 snprintf(info->model,
977 sizeof(info->model),
978 "Intel 82599");
979 } else {
980 snprintf(info->model,
981 sizeof(info->model),
982 "Intel X540");
983 }
984
985 /* Model Description */
986 snprintf(info->model_description,
987 sizeof(info->model_description),
988 "%s",
989 ixgbe_default_device_descr);
990
991 return 0;
992}
993
994/**
995 * ixgbe_fcoe_get_tc - get the current TC that fcoe is mapped to
996 * @adapter - pointer to the device adapter structure
997 *
998 * Return : TC that FCoE is mapped to
999 */
1000u8 ixgbe_fcoe_get_tc(struct ixgbe_adapter *adapter)
1001{
1002#ifdef CONFIG_IXGBE_DCB
1003 return netdev_get_prio_tc_map(adapter->netdev, adapter->fcoe.up);
1004#else
1005 return 0;
1006#endif
1007}