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1/*******************************************************************************
2
3 Intel 10 Gigabit PCI Express Linux driver
4 Copyright(c) 1999 - 2011 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 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
24 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25
26*******************************************************************************/
27
28#include "ixgbe.h"
29#include <linux/if_ether.h>
30#include <linux/gfp.h>
31#include <linux/if_vlan.h>
32#include <scsi/scsi_cmnd.h>
33#include <scsi/scsi_device.h>
34#include <scsi/fc/fc_fs.h>
35#include <scsi/fc/fc_fcoe.h>
36#include <scsi/libfc.h>
37#include <scsi/libfcoe.h>
38
39/**
40 * ixgbe_fcoe_clear_ddp - clear the given ddp context
41 * @ddp - ptr to the ixgbe_fcoe_ddp
42 *
43 * Returns : none
44 *
45 */
46static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
47{
48 ddp->len = 0;
49 ddp->err = 1;
50 ddp->udl = NULL;
51 ddp->udp = 0UL;
52 ddp->sgl = NULL;
53 ddp->sgc = 0;
54}
55
56/**
57 * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
58 * @netdev: the corresponding net_device
59 * @xid: the xid that corresponding ddp will be freed
60 *
61 * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
62 * and it is expected to be called by ULD, i.e., FCP layer of libfc
63 * to release the corresponding ddp context when the I/O is done.
64 *
65 * Returns : data length already ddp-ed in bytes
66 */
67int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
68{
69 int len = 0;
70 struct ixgbe_fcoe *fcoe;
71 struct ixgbe_adapter *adapter;
72 struct ixgbe_fcoe_ddp *ddp;
73 u32 fcbuff;
74
75 if (!netdev)
76 goto out_ddp_put;
77
78 if (xid >= IXGBE_FCOE_DDP_MAX)
79 goto out_ddp_put;
80
81 adapter = netdev_priv(netdev);
82 fcoe = &adapter->fcoe;
83 ddp = &fcoe->ddp[xid];
84 if (!ddp->udl)
85 goto out_ddp_put;
86
87 len = ddp->len;
88 /* if there an error, force to invalidate ddp context */
89 if (ddp->err) {
90 spin_lock_bh(&fcoe->lock);
91 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLT, 0);
92 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLTRW,
93 (xid | IXGBE_FCFLTRW_WE));
94 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCBUFF, 0);
95 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
96 (xid | IXGBE_FCDMARW_WE));
97
98 /* guaranteed to be invalidated after 100us */
99 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
100 (xid | IXGBE_FCDMARW_RE));
101 fcbuff = IXGBE_READ_REG(&adapter->hw, IXGBE_FCBUFF);
102 spin_unlock_bh(&fcoe->lock);
103 if (fcbuff & IXGBE_FCBUFF_VALID)
104 udelay(100);
105 }
106 if (ddp->sgl)
107 pci_unmap_sg(adapter->pdev, ddp->sgl, ddp->sgc,
108 DMA_FROM_DEVICE);
109 if (ddp->pool) {
110 pci_pool_free(ddp->pool, ddp->udl, ddp->udp);
111 ddp->pool = NULL;
112 }
113
114 ixgbe_fcoe_clear_ddp(ddp);
115
116out_ddp_put:
117 return len;
118}
119
120/**
121 * ixgbe_fcoe_ddp_setup - called to set up ddp context
122 * @netdev: the corresponding net_device
123 * @xid: the exchange id requesting ddp
124 * @sgl: the scatter-gather list for this request
125 * @sgc: the number of scatter-gather items
126 *
127 * Returns : 1 for success and 0 for no ddp
128 */
129static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
130 struct scatterlist *sgl, unsigned int sgc,
131 int target_mode)
132{
133 struct ixgbe_adapter *adapter;
134 struct ixgbe_hw *hw;
135 struct ixgbe_fcoe *fcoe;
136 struct ixgbe_fcoe_ddp *ddp;
137 struct scatterlist *sg;
138 unsigned int i, j, dmacount;
139 unsigned int len;
140 static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
141 unsigned int firstoff = 0;
142 unsigned int lastsize;
143 unsigned int thisoff = 0;
144 unsigned int thislen = 0;
145 u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
146 dma_addr_t addr = 0;
147 struct pci_pool *pool;
148
149 if (!netdev || !sgl)
150 return 0;
151
152 adapter = netdev_priv(netdev);
153 if (xid >= IXGBE_FCOE_DDP_MAX) {
154 e_warn(drv, "xid=0x%x out-of-range\n", xid);
155 return 0;
156 }
157
158 /* no DDP if we are already down or resetting */
159 if (test_bit(__IXGBE_DOWN, &adapter->state) ||
160 test_bit(__IXGBE_RESETTING, &adapter->state))
161 return 0;
162
163 fcoe = &adapter->fcoe;
164 if (!fcoe->pool) {
165 e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
166 return 0;
167 }
168
169 ddp = &fcoe->ddp[xid];
170 if (ddp->sgl) {
171 e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
172 xid, ddp->sgl, ddp->sgc);
173 return 0;
174 }
175 ixgbe_fcoe_clear_ddp(ddp);
176
177 /* setup dma from scsi command sgl */
178 dmacount = pci_map_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
179 if (dmacount == 0) {
180 e_err(drv, "xid 0x%x DMA map error\n", xid);
181 return 0;
182 }
183
184 /* alloc the udl from per cpu ddp pool */
185 pool = *per_cpu_ptr(fcoe->pool, get_cpu());
186 ddp->udl = pci_pool_alloc(pool, GFP_ATOMIC, &ddp->udp);
187 if (!ddp->udl) {
188 e_err(drv, "failed allocated ddp context\n");
189 goto out_noddp_unmap;
190 }
191 ddp->pool = pool;
192 ddp->sgl = sgl;
193 ddp->sgc = sgc;
194
195 j = 0;
196 for_each_sg(sgl, sg, dmacount, i) {
197 addr = sg_dma_address(sg);
198 len = sg_dma_len(sg);
199 while (len) {
200 /* max number of buffers allowed in one DDP context */
201 if (j >= IXGBE_BUFFCNT_MAX) {
202 e_err(drv, "xid=%x:%d,%d,%d:addr=%llx "
203 "not enough descriptors\n",
204 xid, i, j, dmacount, (u64)addr);
205 goto out_noddp_free;
206 }
207
208 /* get the offset of length of current buffer */
209 thisoff = addr & ((dma_addr_t)bufflen - 1);
210 thislen = min((bufflen - thisoff), len);
211 /*
212 * all but the 1st buffer (j == 0)
213 * must be aligned on bufflen
214 */
215 if ((j != 0) && (thisoff))
216 goto out_noddp_free;
217 /*
218 * all but the last buffer
219 * ((i == (dmacount - 1)) && (thislen == len))
220 * must end at bufflen
221 */
222 if (((i != (dmacount - 1)) || (thislen != len))
223 && ((thislen + thisoff) != bufflen))
224 goto out_noddp_free;
225
226 ddp->udl[j] = (u64)(addr - thisoff);
227 /* only the first buffer may have none-zero offset */
228 if (j == 0)
229 firstoff = thisoff;
230 len -= thislen;
231 addr += thislen;
232 j++;
233 }
234 }
235 /* only the last buffer may have non-full bufflen */
236 lastsize = thisoff + thislen;
237
238 /*
239 * lastsize can not be buffer len.
240 * If it is then adding another buffer with lastsize = 1.
241 */
242 if (lastsize == bufflen) {
243 if (j >= IXGBE_BUFFCNT_MAX) {
244 e_err(drv, "xid=%x:%d,%d,%d:addr=%llx "
245 "not enough user buffers. We need an extra "
246 "buffer because lastsize is bufflen.\n",
247 xid, i, j, dmacount, (u64)addr);
248 goto out_noddp_free;
249 }
250
251 ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
252 j++;
253 lastsize = 1;
254 }
255 put_cpu();
256
257 fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
258 fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
259 fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
260 /* Set WRCONTX bit to allow DDP for target */
261 if (target_mode)
262 fcbuff |= (IXGBE_FCBUFF_WRCONTX);
263 fcbuff |= (IXGBE_FCBUFF_VALID);
264
265 fcdmarw = xid;
266 fcdmarw |= IXGBE_FCDMARW_WE;
267 fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
268
269 fcfltrw = xid;
270 fcfltrw |= IXGBE_FCFLTRW_WE;
271
272 /* program DMA context */
273 hw = &adapter->hw;
274 spin_lock_bh(&fcoe->lock);
275
276 /* turn on last frame indication for target mode as FCP_RSPtarget is
277 * supposed to send FCP_RSP when it is done. */
278 if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
279 set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
280 fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
281 fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
282 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
283 }
284
285 IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
286 IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
287 IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
288 IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
289 /* program filter context */
290 IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
291 IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
292 IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
293
294 spin_unlock_bh(&fcoe->lock);
295
296 return 1;
297
298out_noddp_free:
299 pci_pool_free(pool, ddp->udl, ddp->udp);
300 ixgbe_fcoe_clear_ddp(ddp);
301
302out_noddp_unmap:
303 pci_unmap_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
304 put_cpu();
305 return 0;
306}
307
308/**
309 * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
310 * @netdev: the corresponding net_device
311 * @xid: the exchange id requesting ddp
312 * @sgl: the scatter-gather list for this request
313 * @sgc: the number of scatter-gather items
314 *
315 * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
316 * and is expected to be called from ULD, e.g., FCP layer of libfc
317 * to set up ddp for the corresponding xid of the given sglist for
318 * the corresponding I/O.
319 *
320 * Returns : 1 for success and 0 for no ddp
321 */
322int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
323 struct scatterlist *sgl, unsigned int sgc)
324{
325 return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
326}
327
328/**
329 * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
330 * @netdev: the corresponding net_device
331 * @xid: the exchange id requesting ddp
332 * @sgl: the scatter-gather list for this request
333 * @sgc: the number of scatter-gather items
334 *
335 * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
336 * and is expected to be called from ULD, e.g., FCP layer of libfc
337 * to set up ddp for the corresponding xid of the given sglist for
338 * the corresponding I/O. The DDP in target mode is a write I/O request
339 * from the initiator.
340 *
341 * Returns : 1 for success and 0 for no ddp
342 */
343int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
344 struct scatterlist *sgl, unsigned int sgc)
345{
346 return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
347}
348
349/**
350 * ixgbe_fcoe_ddp - check ddp status and mark it done
351 * @adapter: ixgbe adapter
352 * @rx_desc: advanced rx descriptor
353 * @skb: the skb holding the received data
354 *
355 * This checks ddp status.
356 *
357 * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
358 * not passing the skb to ULD, > 0 indicates is the length of data
359 * being ddped.
360 */
361int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
362 union ixgbe_adv_rx_desc *rx_desc,
363 struct sk_buff *skb,
364 u32 staterr)
365{
366 u16 xid;
367 u32 fctl;
368 u32 fceofe, fcerr, fcstat;
369 int rc = -EINVAL;
370 struct ixgbe_fcoe *fcoe;
371 struct ixgbe_fcoe_ddp *ddp;
372 struct fc_frame_header *fh;
373 struct fcoe_crc_eof *crc;
374
375 fcerr = (staterr & IXGBE_RXDADV_ERR_FCERR);
376 fceofe = (staterr & IXGBE_RXDADV_ERR_FCEOFE);
377 if (fcerr == IXGBE_FCERR_BADCRC)
378 skb_checksum_none_assert(skb);
379 else
380 skb->ip_summed = CHECKSUM_UNNECESSARY;
381
382 if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
383 fh = (struct fc_frame_header *)(skb->data +
384 sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
385 else
386 fh = (struct fc_frame_header *)(skb->data +
387 sizeof(struct fcoe_hdr));
388 fctl = ntoh24(fh->fh_f_ctl);
389 if (fctl & FC_FC_EX_CTX)
390 xid = be16_to_cpu(fh->fh_ox_id);
391 else
392 xid = be16_to_cpu(fh->fh_rx_id);
393
394 if (xid >= IXGBE_FCOE_DDP_MAX)
395 goto ddp_out;
396
397 fcoe = &adapter->fcoe;
398 ddp = &fcoe->ddp[xid];
399 if (!ddp->udl)
400 goto ddp_out;
401
402 if (fcerr | fceofe)
403 goto ddp_out;
404
405 fcstat = (staterr & IXGBE_RXDADV_STAT_FCSTAT);
406 if (fcstat) {
407 /* update length of DDPed data */
408 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
409 /* unmap the sg list when FCP_RSP is received */
410 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_FCPRSP) {
411 pci_unmap_sg(adapter->pdev, ddp->sgl,
412 ddp->sgc, DMA_FROM_DEVICE);
413 ddp->err = (fcerr | fceofe);
414 ddp->sgl = NULL;
415 ddp->sgc = 0;
416 }
417 /* return 0 to bypass going to ULD for DDPed data */
418 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_DDP)
419 rc = 0;
420 else if (ddp->len)
421 rc = ddp->len;
422 }
423 /* In target mode, check the last data frame of the sequence.
424 * For DDP in target mode, data is already DDPed but the header
425 * indication of the last data frame ould allow is to tell if we
426 * got all the data and the ULP can send FCP_RSP back, as this is
427 * not a full fcoe frame, we fill the trailer here so it won't be
428 * dropped by the ULP stack.
429 */
430 if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
431 (fctl & FC_FC_END_SEQ)) {
432 crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
433 crc->fcoe_eof = FC_EOF_T;
434 }
435ddp_out:
436 return rc;
437}
438
439/**
440 * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
441 * @adapter: ixgbe adapter
442 * @tx_ring: tx desc ring
443 * @skb: associated skb
444 * @tx_flags: tx flags
445 * @hdr_len: hdr_len to be returned
446 *
447 * This sets up large send offload for FCoE
448 *
449 * Returns : 0 indicates no FSO, > 0 for FSO, < 0 for error
450 */
451int ixgbe_fso(struct ixgbe_ring *tx_ring, struct sk_buff *skb,
452 u32 tx_flags, u8 *hdr_len)
453{
454 struct fc_frame_header *fh;
455 u32 vlan_macip_lens;
456 u32 fcoe_sof_eof = 0;
457 u32 mss_l4len_idx;
458 u8 sof, eof;
459
460 if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
461 dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
462 skb_shinfo(skb)->gso_type);
463 return -EINVAL;
464 }
465
466 /* resets the header to point fcoe/fc */
467 skb_set_network_header(skb, skb->mac_len);
468 skb_set_transport_header(skb, skb->mac_len +
469 sizeof(struct fcoe_hdr));
470
471 /* sets up SOF and ORIS */
472 sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
473 switch (sof) {
474 case FC_SOF_I2:
475 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
476 break;
477 case FC_SOF_I3:
478 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
479 IXGBE_ADVTXD_FCOEF_ORIS;
480 break;
481 case FC_SOF_N2:
482 break;
483 case FC_SOF_N3:
484 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
485 break;
486 default:
487 dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
488 return -EINVAL;
489 }
490
491 /* the first byte of the last dword is EOF */
492 skb_copy_bits(skb, skb->len - 4, &eof, 1);
493 /* sets up EOF and ORIE */
494 switch (eof) {
495 case FC_EOF_N:
496 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
497 break;
498 case FC_EOF_T:
499 /* lso needs ORIE */
500 if (skb_is_gso(skb))
501 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
502 IXGBE_ADVTXD_FCOEF_ORIE;
503 else
504 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
505 break;
506 case FC_EOF_NI:
507 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
508 break;
509 case FC_EOF_A:
510 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
511 break;
512 default:
513 dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
514 return -EINVAL;
515 }
516
517 /* sets up PARINC indicating data offset */
518 fh = (struct fc_frame_header *)skb_transport_header(skb);
519 if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
520 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
521
522 /* include trailer in headlen as it is replicated per frame */
523 *hdr_len = sizeof(struct fcoe_crc_eof);
524
525 /* hdr_len includes fc_hdr if FCoE LSO is enabled */
526 if (skb_is_gso(skb))
527 *hdr_len += (skb_transport_offset(skb) +
528 sizeof(struct fc_frame_header));
529
530 /* mss_l4len_id: use 1 for FSO as TSO, no need for L4LEN */
531 mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
532 mss_l4len_idx |= 1 << IXGBE_ADVTXD_IDX_SHIFT;
533
534 /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
535 vlan_macip_lens = skb_transport_offset(skb) +
536 sizeof(struct fc_frame_header);
537 vlan_macip_lens |= (skb_transport_offset(skb) - 4)
538 << IXGBE_ADVTXD_MACLEN_SHIFT;
539 vlan_macip_lens |= tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
540
541 /* write context desc */
542 ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
543 IXGBE_ADVTXT_TUCMD_FCOE, mss_l4len_idx);
544
545 return skb_is_gso(skb);
546}
547
548static void ixgbe_fcoe_ddp_pools_free(struct ixgbe_fcoe *fcoe)
549{
550 unsigned int cpu;
551 struct pci_pool **pool;
552
553 for_each_possible_cpu(cpu) {
554 pool = per_cpu_ptr(fcoe->pool, cpu);
555 if (*pool)
556 pci_pool_destroy(*pool);
557 }
558 free_percpu(fcoe->pool);
559 fcoe->pool = NULL;
560}
561
562static void ixgbe_fcoe_ddp_pools_alloc(struct ixgbe_adapter *adapter)
563{
564 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
565 unsigned int cpu;
566 struct pci_pool **pool;
567 char pool_name[32];
568
569 fcoe->pool = alloc_percpu(struct pci_pool *);
570 if (!fcoe->pool)
571 return;
572
573 /* allocate pci pool for each cpu */
574 for_each_possible_cpu(cpu) {
575 snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%d", cpu);
576 pool = per_cpu_ptr(fcoe->pool, cpu);
577 *pool = pci_pool_create(pool_name,
578 adapter->pdev, IXGBE_FCPTR_MAX,
579 IXGBE_FCPTR_ALIGN, PAGE_SIZE);
580 if (!*pool) {
581 e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
582 ixgbe_fcoe_ddp_pools_free(fcoe);
583 return;
584 }
585 }
586}
587
588/**
589 * ixgbe_configure_fcoe - configures registers for fcoe at start
590 * @adapter: ptr to ixgbe adapter
591 *
592 * This sets up FCoE related registers
593 *
594 * Returns : none
595 */
596void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
597{
598 int i, fcoe_q, fcoe_i;
599 struct ixgbe_hw *hw = &adapter->hw;
600 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
601 struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE];
602
603 if (!fcoe->pool) {
604 spin_lock_init(&fcoe->lock);
605
606 ixgbe_fcoe_ddp_pools_alloc(adapter);
607 if (!fcoe->pool) {
608 e_err(drv, "failed to alloc percpu fcoe DDP pools\n");
609 return;
610 }
611
612 /* Extra buffer to be shared by all DDPs for HW work around */
613 fcoe->extra_ddp_buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
614 if (fcoe->extra_ddp_buffer == NULL) {
615 e_err(drv, "failed to allocated extra DDP buffer\n");
616 goto out_ddp_pools;
617 }
618
619 fcoe->extra_ddp_buffer_dma =
620 dma_map_single(&adapter->pdev->dev,
621 fcoe->extra_ddp_buffer,
622 IXGBE_FCBUFF_MIN,
623 DMA_FROM_DEVICE);
624 if (dma_mapping_error(&adapter->pdev->dev,
625 fcoe->extra_ddp_buffer_dma)) {
626 e_err(drv, "failed to map extra DDP buffer\n");
627 goto out_extra_ddp_buffer;
628 }
629 }
630
631 /* Enable L2 eth type filter for FCoE */
632 IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE),
633 (ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN));
634 /* Enable L2 eth type filter for FIP */
635 IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP),
636 (ETH_P_FIP | IXGBE_ETQF_FILTER_EN));
637 if (adapter->ring_feature[RING_F_FCOE].indices) {
638 /* Use multiple rx queues for FCoE by redirection table */
639 for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
640 fcoe_i = f->mask + i % f->indices;
641 fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
642 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
643 IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
644 }
645 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
646 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
647 } else {
648 /* Use single rx queue for FCoE */
649 fcoe_i = f->mask;
650 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
651 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, 0);
652 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE),
653 IXGBE_ETQS_QUEUE_EN |
654 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
655 }
656 /* send FIP frames to the first FCoE queue */
657 fcoe_i = f->mask;
658 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
659 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
660 IXGBE_ETQS_QUEUE_EN |
661 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
662
663 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
664 IXGBE_FCRXCTRL_FCOELLI |
665 IXGBE_FCRXCTRL_FCCRCBO |
666 (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
667 return;
668
669out_extra_ddp_buffer:
670 kfree(fcoe->extra_ddp_buffer);
671out_ddp_pools:
672 ixgbe_fcoe_ddp_pools_free(fcoe);
673}
674
675/**
676 * ixgbe_cleanup_fcoe - release all fcoe ddp context resources
677 * @adapter : ixgbe adapter
678 *
679 * Cleans up outstanding ddp context resources
680 *
681 * Returns : none
682 */
683void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter)
684{
685 int i;
686 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
687
688 if (!fcoe->pool)
689 return;
690
691 for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
692 ixgbe_fcoe_ddp_put(adapter->netdev, i);
693 dma_unmap_single(&adapter->pdev->dev,
694 fcoe->extra_ddp_buffer_dma,
695 IXGBE_FCBUFF_MIN,
696 DMA_FROM_DEVICE);
697 kfree(fcoe->extra_ddp_buffer);
698 ixgbe_fcoe_ddp_pools_free(fcoe);
699}
700
701/**
702 * ixgbe_fcoe_enable - turn on FCoE offload feature
703 * @netdev: the corresponding netdev
704 *
705 * Turns on FCoE offload feature in 82599.
706 *
707 * Returns : 0 indicates success or -EINVAL on failure
708 */
709int ixgbe_fcoe_enable(struct net_device *netdev)
710{
711 int rc = -EINVAL;
712 struct ixgbe_adapter *adapter = netdev_priv(netdev);
713 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
714
715
716 if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
717 goto out_enable;
718
719 atomic_inc(&fcoe->refcnt);
720 if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
721 goto out_enable;
722
723 e_info(drv, "Enabling FCoE offload features.\n");
724 if (netif_running(netdev))
725 netdev->netdev_ops->ndo_stop(netdev);
726
727 ixgbe_clear_interrupt_scheme(adapter);
728
729 adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
730 adapter->ring_feature[RING_F_FCOE].indices = IXGBE_FCRETA_SIZE;
731 netdev->features |= NETIF_F_FCOE_CRC;
732 netdev->features |= NETIF_F_FSO;
733 netdev->features |= NETIF_F_FCOE_MTU;
734 netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
735
736 ixgbe_init_interrupt_scheme(adapter);
737 netdev_features_change(netdev);
738
739 if (netif_running(netdev))
740 netdev->netdev_ops->ndo_open(netdev);
741 rc = 0;
742
743out_enable:
744 return rc;
745}
746
747/**
748 * ixgbe_fcoe_disable - turn off FCoE offload feature
749 * @netdev: the corresponding netdev
750 *
751 * Turns off FCoE offload feature in 82599.
752 *
753 * Returns : 0 indicates success or -EINVAL on failure
754 */
755int ixgbe_fcoe_disable(struct net_device *netdev)
756{
757 int rc = -EINVAL;
758 struct ixgbe_adapter *adapter = netdev_priv(netdev);
759 struct ixgbe_fcoe *fcoe = &adapter->fcoe;
760
761 if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
762 goto out_disable;
763
764 if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
765 goto out_disable;
766
767 if (!atomic_dec_and_test(&fcoe->refcnt))
768 goto out_disable;
769
770 e_info(drv, "Disabling FCoE offload features.\n");
771 netdev->features &= ~NETIF_F_FCOE_CRC;
772 netdev->features &= ~NETIF_F_FSO;
773 netdev->features &= ~NETIF_F_FCOE_MTU;
774 netdev->fcoe_ddp_xid = 0;
775 netdev_features_change(netdev);
776
777 if (netif_running(netdev))
778 netdev->netdev_ops->ndo_stop(netdev);
779
780 ixgbe_clear_interrupt_scheme(adapter);
781 adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
782 adapter->ring_feature[RING_F_FCOE].indices = 0;
783 ixgbe_cleanup_fcoe(adapter);
784 ixgbe_init_interrupt_scheme(adapter);
785
786 if (netif_running(netdev))
787 netdev->netdev_ops->ndo_open(netdev);
788 rc = 0;
789
790out_disable:
791 return rc;
792}
793
794/**
795 * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
796 * @netdev : ixgbe adapter
797 * @wwn : the world wide name
798 * @type: the type of world wide name
799 *
800 * Returns the node or port world wide name if both the prefix and the san
801 * mac address are valid, then the wwn is formed based on the NAA-2 for
802 * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
803 *
804 * Returns : 0 on success
805 */
806int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
807{
808 int rc = -EINVAL;
809 u16 prefix = 0xffff;
810 struct ixgbe_adapter *adapter = netdev_priv(netdev);
811 struct ixgbe_mac_info *mac = &adapter->hw.mac;
812
813 switch (type) {
814 case NETDEV_FCOE_WWNN:
815 prefix = mac->wwnn_prefix;
816 break;
817 case NETDEV_FCOE_WWPN:
818 prefix = mac->wwpn_prefix;
819 break;
820 default:
821 break;
822 }
823
824 if ((prefix != 0xffff) &&
825 is_valid_ether_addr(mac->san_addr)) {
826 *wwn = ((u64) prefix << 48) |
827 ((u64) mac->san_addr[0] << 40) |
828 ((u64) mac->san_addr[1] << 32) |
829 ((u64) mac->san_addr[2] << 24) |
830 ((u64) mac->san_addr[3] << 16) |
831 ((u64) mac->san_addr[4] << 8) |
832 ((u64) mac->san_addr[5]);
833 rc = 0;
834 }
835 return rc;
836}