1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 1999 - 2018 Intel Corporation. */
3 
4 #include "ixgbe.h"
5 #include <linux/if_ether.h>
6 #include <linux/gfp.h>
7 #include <linux/if_vlan.h>
8 #include <generated/utsrelease.h>
9 #include <scsi/scsi_cmnd.h>
10 #include <scsi/scsi_device.h>
11 #include <scsi/fc/fc_fs.h>
12 #include <scsi/fc/fc_fcoe.h>
13 #include <scsi/libfc.h>
14 #include <scsi/libfcoe.h>
15 
16 /**
17  * ixgbe_fcoe_clear_ddp - clear the given ddp context
18  * @ddp: ptr to the ixgbe_fcoe_ddp
19  *
20  * Returns : none
21  *
22  */
23 static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
24 {
25 	ddp->len = 0;
26 	ddp->err = 1;
27 	ddp->udl = NULL;
28 	ddp->udp = 0UL;
29 	ddp->sgl = NULL;
30 	ddp->sgc = 0;
31 }
32 
33 /**
34  * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
35  * @netdev: the corresponding net_device
36  * @xid: the xid that corresponding ddp will be freed
37  *
38  * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
39  * and it is expected to be called by ULD, i.e., FCP layer of libfc
40  * to release the corresponding ddp context when the I/O is done.
41  *
42  * Returns : data length already ddp-ed in bytes
43  */
44 int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
45 {
46 	int len;
47 	struct ixgbe_fcoe *fcoe;
48 	struct ixgbe_adapter *adapter;
49 	struct ixgbe_fcoe_ddp *ddp;
50 	struct ixgbe_hw *hw;
51 	u32 fcbuff;
52 
53 	if (!netdev)
54 		return 0;
55 
56 	if (xid >= netdev->fcoe_ddp_xid)
57 		return 0;
58 
59 	adapter = netdev_priv(netdev);
60 	fcoe = &adapter->fcoe;
61 	ddp = &fcoe->ddp[xid];
62 	if (!ddp->udl)
63 		return 0;
64 
65 	hw = &adapter->hw;
66 	len = ddp->len;
67 	/* if no error then skip ddp context invalidation */
68 	if (!ddp->err)
69 		goto skip_ddpinv;
70 
71 	if (hw->mac.type == ixgbe_mac_X550) {
72 		/* X550 does not require DDP FCoE lock */
73 
74 		IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), 0);
75 		IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid),
76 				(xid | IXGBE_FCFLTRW_WE));
77 
78 		/* program FCBUFF */
79 		IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), 0);
80 
81 		/* program FCDMARW */
82 		IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
83 				(xid | IXGBE_FCDMARW_WE));
84 
85 		/* read FCBUFF to check context invalidated */
86 		IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
87 				(xid | IXGBE_FCDMARW_RE));
88 		fcbuff = IXGBE_READ_REG(hw, IXGBE_FCDDC(2, xid));
89 	} else {
90 		/* other hardware requires DDP FCoE lock */
91 		spin_lock_bh(&fcoe->lock);
92 		IXGBE_WRITE_REG(hw, IXGBE_FCFLT, 0);
93 		IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW,
94 				(xid | IXGBE_FCFLTRW_WE));
95 		IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, 0);
96 		IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
97 				(xid | IXGBE_FCDMARW_WE));
98 
99 		/* guaranteed to be invalidated after 100us */
100 		IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
101 				(xid | IXGBE_FCDMARW_RE));
102 		fcbuff = IXGBE_READ_REG(hw, IXGBE_FCBUFF);
103 		spin_unlock_bh(&fcoe->lock);
104 		}
105 
106 	if (fcbuff & IXGBE_FCBUFF_VALID)
107 		usleep_range(100, 150);
108 
109 skip_ddpinv:
110 	if (ddp->sgl)
111 		dma_unmap_sg(&adapter->pdev->dev, ddp->sgl, ddp->sgc,
112 			     DMA_FROM_DEVICE);
113 	if (ddp->pool) {
114 		dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
115 		ddp->pool = NULL;
116 	}
117 
118 	ixgbe_fcoe_clear_ddp(ddp);
119 
120 	return len;
121 }
122 
123 /**
124  * ixgbe_fcoe_ddp_setup - called to set up ddp context
125  * @netdev: the corresponding net_device
126  * @xid: the exchange id requesting ddp
127  * @sgl: the scatter-gather list for this request
128  * @sgc: the number of scatter-gather items
129  * @target_mode: 1 to setup target mode, 0 to setup initiator mode
130  *
131  * Returns : 1 for success and 0 for no ddp
132  */
133 static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
134 				struct scatterlist *sgl, unsigned int sgc,
135 				int target_mode)
136 {
137 	struct ixgbe_adapter *adapter;
138 	struct ixgbe_hw *hw;
139 	struct ixgbe_fcoe *fcoe;
140 	struct ixgbe_fcoe_ddp *ddp;
141 	struct ixgbe_fcoe_ddp_pool *ddp_pool;
142 	struct scatterlist *sg;
143 	unsigned int i, j, dmacount;
144 	unsigned int len;
145 	static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
146 	unsigned int firstoff = 0;
147 	unsigned int lastsize;
148 	unsigned int thisoff = 0;
149 	unsigned int thislen = 0;
150 	u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
151 	dma_addr_t addr = 0;
152 
153 	if (!netdev || !sgl)
154 		return 0;
155 
156 	adapter = netdev_priv(netdev);
157 	if (xid >= netdev->fcoe_ddp_xid) {
158 		e_warn(drv, "xid=0x%x out-of-range\n", xid);
159 		return 0;
160 	}
161 
162 	/* no DDP if we are already down or resetting */
163 	if (test_bit(__IXGBE_DOWN, &adapter->state) ||
164 	    test_bit(__IXGBE_RESETTING, &adapter->state))
165 		return 0;
166 
167 	fcoe = &adapter->fcoe;
168 	ddp = &fcoe->ddp[xid];
169 	if (ddp->sgl) {
170 		e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
171 		      xid, ddp->sgl, ddp->sgc);
172 		return 0;
173 	}
174 	ixgbe_fcoe_clear_ddp(ddp);
175 
176 
177 	if (!fcoe->ddp_pool) {
178 		e_warn(drv, "No ddp_pool resources allocated\n");
179 		return 0;
180 	}
181 
182 	ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
183 	if (!ddp_pool->pool) {
184 		e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
185 		goto out_noddp;
186 	}
187 
188 	/* setup dma from scsi command sgl */
189 	dmacount = dma_map_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
190 	if (dmacount == 0) {
191 		e_err(drv, "xid 0x%x DMA map error\n", xid);
192 		goto out_noddp;
193 	}
194 
195 	/* alloc the udl from per cpu ddp pool */
196 	ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
197 	if (!ddp->udl) {
198 		e_err(drv, "failed allocated ddp context\n");
199 		goto out_noddp_unmap;
200 	}
201 	ddp->pool = ddp_pool->pool;
202 	ddp->sgl = sgl;
203 	ddp->sgc = sgc;
204 
205 	j = 0;
206 	for_each_sg(sgl, sg, dmacount, i) {
207 		addr = sg_dma_address(sg);
208 		len = sg_dma_len(sg);
209 		while (len) {
210 			/* max number of buffers allowed in one DDP context */
211 			if (j >= IXGBE_BUFFCNT_MAX) {
212 				ddp_pool->noddp++;
213 				goto out_noddp_free;
214 			}
215 
216 			/* get the offset of length of current buffer */
217 			thisoff = addr & ((dma_addr_t)bufflen - 1);
218 			thislen = min((bufflen - thisoff), len);
219 			/*
220 			 * all but the 1st buffer (j == 0)
221 			 * must be aligned on bufflen
222 			 */
223 			if ((j != 0) && (thisoff))
224 				goto out_noddp_free;
225 			/*
226 			 * all but the last buffer
227 			 * ((i == (dmacount - 1)) && (thislen == len))
228 			 * must end at bufflen
229 			 */
230 			if (((i != (dmacount - 1)) || (thislen != len))
231 			    && ((thislen + thisoff) != bufflen))
232 				goto out_noddp_free;
233 
234 			ddp->udl[j] = (u64)(addr - thisoff);
235 			/* only the first buffer may have none-zero offset */
236 			if (j == 0)
237 				firstoff = thisoff;
238 			len -= thislen;
239 			addr += thislen;
240 			j++;
241 		}
242 	}
243 	/* only the last buffer may have non-full bufflen */
244 	lastsize = thisoff + thislen;
245 
246 	/*
247 	 * lastsize can not be buffer len.
248 	 * If it is then adding another buffer with lastsize = 1.
249 	 */
250 	if (lastsize == bufflen) {
251 		if (j >= IXGBE_BUFFCNT_MAX) {
252 			ddp_pool->noddp_ext_buff++;
253 			goto out_noddp_free;
254 		}
255 
256 		ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
257 		j++;
258 		lastsize = 1;
259 	}
260 	put_cpu();
261 
262 	fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
263 	fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
264 	fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
265 	/* Set WRCONTX bit to allow DDP for target */
266 	if (target_mode)
267 		fcbuff |= (IXGBE_FCBUFF_WRCONTX);
268 	fcbuff |= (IXGBE_FCBUFF_VALID);
269 
270 	fcdmarw = xid;
271 	fcdmarw |= IXGBE_FCDMARW_WE;
272 	fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
273 
274 	fcfltrw = xid;
275 	fcfltrw |= IXGBE_FCFLTRW_WE;
276 
277 	/* program DMA context */
278 	hw = &adapter->hw;
279 
280 	/* turn on last frame indication for target mode as FCP_RSPtarget is
281 	 * supposed to send FCP_RSP when it is done. */
282 	if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
283 		set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
284 		fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
285 		fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
286 		IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
287 	}
288 
289 	if (hw->mac.type == ixgbe_mac_X550) {
290 		/* X550 does not require DDP lock */
291 
292 		IXGBE_WRITE_REG(hw, IXGBE_FCDDC(0, xid),
293 				ddp->udp & DMA_BIT_MASK(32));
294 		IXGBE_WRITE_REG(hw, IXGBE_FCDDC(1, xid), (u64)ddp->udp >> 32);
295 		IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), fcbuff);
296 		IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid), fcdmarw);
297 		/* program filter context */
298 		IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), IXGBE_FCFLT_VALID);
299 		IXGBE_WRITE_REG(hw, IXGBE_FCDFC(1, xid), 0);
300 		IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid), fcfltrw);
301 	} else {
302 		/* DDP lock for indirect DDP context access */
303 		spin_lock_bh(&fcoe->lock);
304 
305 		IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
306 		IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
307 		IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
308 		IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
309 		/* program filter context */
310 		IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
311 		IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
312 		IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
313 
314 		spin_unlock_bh(&fcoe->lock);
315 	}
316 
317 	return 1;
318 
319 out_noddp_free:
320 	dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
321 	ixgbe_fcoe_clear_ddp(ddp);
322 
323 out_noddp_unmap:
324 	dma_unmap_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
325 out_noddp:
326 	put_cpu();
327 	return 0;
328 }
329 
330 /**
331  * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
332  * @netdev: the corresponding net_device
333  * @xid: the exchange id requesting ddp
334  * @sgl: the scatter-gather list for this request
335  * @sgc: the number of scatter-gather items
336  *
337  * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
338  * and is expected to be called from ULD, e.g., FCP layer of libfc
339  * to set up ddp for the corresponding xid of the given sglist for
340  * the corresponding I/O.
341  *
342  * Returns : 1 for success and 0 for no ddp
343  */
344 int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
345 		       struct scatterlist *sgl, unsigned int sgc)
346 {
347 	return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
348 }
349 
350 /**
351  * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
352  * @netdev: the corresponding net_device
353  * @xid: the exchange id requesting ddp
354  * @sgl: the scatter-gather list for this request
355  * @sgc: the number of scatter-gather items
356  *
357  * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
358  * and is expected to be called from ULD, e.g., FCP layer of libfc
359  * to set up ddp for the corresponding xid of the given sglist for
360  * the corresponding I/O. The DDP in target mode is a write I/O request
361  * from the initiator.
362  *
363  * Returns : 1 for success and 0 for no ddp
364  */
365 int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
366 			    struct scatterlist *sgl, unsigned int sgc)
367 {
368 	return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
369 }
370 
371 /**
372  * ixgbe_fcoe_ddp - check ddp status and mark it done
373  * @adapter: ixgbe adapter
374  * @rx_desc: advanced rx descriptor
375  * @skb: the skb holding the received data
376  *
377  * This checks ddp status.
378  *
379  * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
380  * not passing the skb to ULD, > 0 indicates is the length of data
381  * being ddped.
382  */
383 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
384 		   union ixgbe_adv_rx_desc *rx_desc,
385 		   struct sk_buff *skb)
386 {
387 	int rc = -EINVAL;
388 	struct ixgbe_fcoe *fcoe;
389 	struct ixgbe_fcoe_ddp *ddp;
390 	struct fc_frame_header *fh;
391 	struct fcoe_crc_eof *crc;
392 	__le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
393 	__le32 ddp_err;
394 	int ddp_max;
395 	u32 fctl;
396 	u16 xid;
397 
398 	if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
399 		skb->ip_summed = CHECKSUM_NONE;
400 	else
401 		skb->ip_summed = CHECKSUM_UNNECESSARY;
402 
403 	if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
404 		fh = (struct fc_frame_header *)(skb->data +
405 			sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
406 	else
407 		fh = (struct fc_frame_header *)(skb->data +
408 			sizeof(struct fcoe_hdr));
409 
410 	fctl = ntoh24(fh->fh_f_ctl);
411 	if (fctl & FC_FC_EX_CTX)
412 		xid =  be16_to_cpu(fh->fh_ox_id);
413 	else
414 		xid =  be16_to_cpu(fh->fh_rx_id);
415 
416 	ddp_max = IXGBE_FCOE_DDP_MAX;
417 	/* X550 has different DDP Max limit */
418 	if (adapter->hw.mac.type == ixgbe_mac_X550)
419 		ddp_max = IXGBE_FCOE_DDP_MAX_X550;
420 	if (xid >= ddp_max)
421 		return -EINVAL;
422 
423 	fcoe = &adapter->fcoe;
424 	ddp = &fcoe->ddp[xid];
425 	if (!ddp->udl)
426 		return -EINVAL;
427 
428 	ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
429 					      IXGBE_RXDADV_ERR_FCERR);
430 	if (ddp_err)
431 		return -EINVAL;
432 
433 	switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
434 	/* return 0 to bypass going to ULD for DDPed data */
435 	case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
436 		/* update length of DDPed data */
437 		ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
438 		rc = 0;
439 		break;
440 	/* unmap the sg list when FCPRSP is received */
441 	case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
442 		dma_unmap_sg(&adapter->pdev->dev, ddp->sgl,
443 			     ddp->sgc, DMA_FROM_DEVICE);
444 		ddp->err = (__force u32)ddp_err;
445 		ddp->sgl = NULL;
446 		ddp->sgc = 0;
447 		fallthrough;
448 	/* if DDP length is present pass it through to ULD */
449 	case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
450 		/* update length of DDPed data */
451 		ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
452 		if (ddp->len)
453 			rc = ddp->len;
454 		break;
455 	/* no match will return as an error */
456 	case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
457 	default:
458 		break;
459 	}
460 
461 	/* In target mode, check the last data frame of the sequence.
462 	 * For DDP in target mode, data is already DDPed but the header
463 	 * indication of the last data frame ould allow is to tell if we
464 	 * got all the data and the ULP can send FCP_RSP back, as this is
465 	 * not a full fcoe frame, we fill the trailer here so it won't be
466 	 * dropped by the ULP stack.
467 	 */
468 	if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
469 	    (fctl & FC_FC_END_SEQ)) {
470 		skb_linearize(skb);
471 		crc = skb_put(skb, sizeof(*crc));
472 		crc->fcoe_eof = FC_EOF_T;
473 	}
474 
475 	return rc;
476 }
477 
478 /**
479  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
480  * @tx_ring: tx desc ring
481  * @first: first tx_buffer structure containing skb, tx_flags, and protocol
482  * @hdr_len: hdr_len to be returned
483  *
484  * This sets up large send offload for FCoE
485  *
486  * Returns : 0 indicates success, < 0 for error
487  */
488 int ixgbe_fso(struct ixgbe_ring *tx_ring,
489 	      struct ixgbe_tx_buffer *first,
490 	      u8 *hdr_len)
491 {
492 	struct sk_buff *skb = first->skb;
493 	struct fc_frame_header *fh;
494 	u32 vlan_macip_lens;
495 	u32 fcoe_sof_eof = 0;
496 	u32 mss_l4len_idx;
497 	u32 type_tucmd = IXGBE_ADVTXT_TUCMD_FCOE;
498 	u8 sof, eof;
499 
500 	if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
501 		dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
502 			skb_shinfo(skb)->gso_type);
503 		return -EINVAL;
504 	}
505 
506 	/* resets the header to point fcoe/fc */
507 	skb_set_network_header(skb, skb->mac_len);
508 	skb_set_transport_header(skb, skb->mac_len +
509 				 sizeof(struct fcoe_hdr));
510 
511 	/* sets up SOF and ORIS */
512 	sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
513 	switch (sof) {
514 	case FC_SOF_I2:
515 		fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
516 		break;
517 	case FC_SOF_I3:
518 		fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
519 			       IXGBE_ADVTXD_FCOEF_ORIS;
520 		break;
521 	case FC_SOF_N2:
522 		break;
523 	case FC_SOF_N3:
524 		fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
525 		break;
526 	default:
527 		dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
528 		return -EINVAL;
529 	}
530 
531 	/* the first byte of the last dword is EOF */
532 	skb_copy_bits(skb, skb->len - 4, &eof, 1);
533 	/* sets up EOF and ORIE */
534 	switch (eof) {
535 	case FC_EOF_N:
536 		fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
537 		break;
538 	case FC_EOF_T:
539 		/* lso needs ORIE */
540 		if (skb_is_gso(skb))
541 			fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
542 					IXGBE_ADVTXD_FCOEF_ORIE;
543 		else
544 			fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
545 		break;
546 	case FC_EOF_NI:
547 		fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
548 		break;
549 	case FC_EOF_A:
550 		fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
551 		break;
552 	default:
553 		dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
554 		return -EINVAL;
555 	}
556 
557 	/* sets up PARINC indicating data offset */
558 	fh = (struct fc_frame_header *)skb_transport_header(skb);
559 	if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
560 		fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
561 
562 	/* include trailer in headlen as it is replicated per frame */
563 	*hdr_len = sizeof(struct fcoe_crc_eof);
564 
565 	/* hdr_len includes fc_hdr if FCoE LSO is enabled */
566 	if (skb_is_gso(skb)) {
567 		*hdr_len += skb_transport_offset(skb) +
568 			    sizeof(struct fc_frame_header);
569 		/* update gso_segs and bytecount */
570 		first->gso_segs = DIV_ROUND_UP(skb->len - *hdr_len,
571 					       skb_shinfo(skb)->gso_size);
572 		first->bytecount += (first->gso_segs - 1) * *hdr_len;
573 		first->tx_flags |= IXGBE_TX_FLAGS_TSO;
574 		/* Hardware expects L4T to be RSV for FCoE TSO */
575 		type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_RSV;
576 	}
577 
578 	/* set flag indicating FCOE to ixgbe_tx_map call */
579 	first->tx_flags |= IXGBE_TX_FLAGS_FCOE | IXGBE_TX_FLAGS_CC;
580 
581 	/* mss_l4len_id: use 0 for FSO as TSO, no need for L4LEN */
582 	mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
583 
584 	/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
585 	vlan_macip_lens = skb_transport_offset(skb) +
586 			  sizeof(struct fc_frame_header);
587 	vlan_macip_lens |= (skb_transport_offset(skb) - 4)
588 			   << IXGBE_ADVTXD_MACLEN_SHIFT;
589 	vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
590 
591 	/* write context desc */
592 	ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
593 			  type_tucmd, mss_l4len_idx);
594 
595 	return 0;
596 }
597 
598 static void ixgbe_fcoe_dma_pool_free(struct ixgbe_fcoe *fcoe, unsigned int cpu)
599 {
600 	struct ixgbe_fcoe_ddp_pool *ddp_pool;
601 
602 	ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
603 	dma_pool_destroy(ddp_pool->pool);
604 	ddp_pool->pool = NULL;
605 }
606 
607 static int ixgbe_fcoe_dma_pool_alloc(struct ixgbe_fcoe *fcoe,
608 				     struct device *dev,
609 				     unsigned int cpu)
610 {
611 	struct ixgbe_fcoe_ddp_pool *ddp_pool;
612 	struct dma_pool *pool;
613 	char pool_name[32];
614 
615 	snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%u", cpu);
616 
617 	pool = dma_pool_create(pool_name, dev, IXGBE_FCPTR_MAX,
618 			       IXGBE_FCPTR_ALIGN, PAGE_SIZE);
619 	if (!pool)
620 		return -ENOMEM;
621 
622 	ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
623 	ddp_pool->pool = pool;
624 	ddp_pool->noddp = 0;
625 	ddp_pool->noddp_ext_buff = 0;
626 
627 	return 0;
628 }
629 
630 /**
631  * ixgbe_configure_fcoe - configures registers for fcoe at start
632  * @adapter: ptr to ixgbe adapter
633  *
634  * This sets up FCoE related registers
635  *
636  * Returns : none
637  */
638 void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
639 {
640 	struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
641 	struct ixgbe_hw *hw = &adapter->hw;
642 	int i, fcoe_q, fcoe_i, fcoe_q_h = 0;
643 	int fcreta_size;
644 	u32 etqf;
645 
646 	/* Minimal functionality for FCoE requires at least CRC offloads */
647 	if (!(adapter->netdev->features & NETIF_F_FCOE_CRC))
648 		return;
649 
650 	/* Enable L2 EtherType filter for FCoE, needed for FCoE CRC and DDP */
651 	etqf = ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN;
652 	if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
653 		etqf |= IXGBE_ETQF_POOL_ENABLE;
654 		etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
655 	}
656 	IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), etqf);
657 	IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
658 
659 	/* leave registers un-configured if FCoE is disabled */
660 	if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
661 		return;
662 
663 	/* Use one or more Rx queues for FCoE by redirection table */
664 	fcreta_size = IXGBE_FCRETA_SIZE;
665 	if (adapter->hw.mac.type == ixgbe_mac_X550)
666 		fcreta_size = IXGBE_FCRETA_SIZE_X550;
667 
668 	for (i = 0; i < fcreta_size; i++) {
669 		if (adapter->hw.mac.type == ixgbe_mac_X550) {
670 			int fcoe_i_h = fcoe->offset + ((i + fcreta_size) %
671 							fcoe->indices);
672 			fcoe_q_h = adapter->rx_ring[fcoe_i_h]->reg_idx;
673 			fcoe_q_h = (fcoe_q_h << IXGBE_FCRETA_ENTRY_HIGH_SHIFT) &
674 				   IXGBE_FCRETA_ENTRY_HIGH_MASK;
675 		}
676 
677 		fcoe_i = fcoe->offset + (i % fcoe->indices);
678 		fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
679 		fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
680 		fcoe_q |= fcoe_q_h;
681 		IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
682 	}
683 	IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
684 
685 	/* Enable L2 EtherType filter for FIP */
686 	etqf = ETH_P_FIP | IXGBE_ETQF_FILTER_EN;
687 	if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
688 		etqf |= IXGBE_ETQF_POOL_ENABLE;
689 		etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
690 	}
691 	IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP), etqf);
692 
693 	/* Send FIP frames to the first FCoE queue */
694 	fcoe_q = adapter->rx_ring[fcoe->offset]->reg_idx;
695 	IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
696 			IXGBE_ETQS_QUEUE_EN |
697 			(fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
698 
699 	/* Configure FCoE Rx control */
700 	IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
701 			IXGBE_FCRXCTRL_FCCRCBO |
702 			(FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
703 }
704 
705 /**
706  * ixgbe_free_fcoe_ddp_resources - release all fcoe ddp context resources
707  * @adapter : ixgbe adapter
708  *
709  * Cleans up outstanding ddp context resources
710  *
711  * Returns : none
712  */
713 void ixgbe_free_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
714 {
715 	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
716 	int cpu, i, ddp_max;
717 
718 	/* do nothing if no DDP pools were allocated */
719 	if (!fcoe->ddp_pool)
720 		return;
721 
722 	ddp_max = IXGBE_FCOE_DDP_MAX;
723 	/* X550 has different DDP Max limit */
724 	if (adapter->hw.mac.type == ixgbe_mac_X550)
725 		ddp_max = IXGBE_FCOE_DDP_MAX_X550;
726 
727 	for (i = 0; i < ddp_max; i++)
728 		ixgbe_fcoe_ddp_put(adapter->netdev, i);
729 
730 	for_each_possible_cpu(cpu)
731 		ixgbe_fcoe_dma_pool_free(fcoe, cpu);
732 
733 	dma_unmap_single(&adapter->pdev->dev,
734 			 fcoe->extra_ddp_buffer_dma,
735 			 IXGBE_FCBUFF_MIN,
736 			 DMA_FROM_DEVICE);
737 	kfree(fcoe->extra_ddp_buffer);
738 
739 	fcoe->extra_ddp_buffer = NULL;
740 	fcoe->extra_ddp_buffer_dma = 0;
741 }
742 
743 /**
744  * ixgbe_setup_fcoe_ddp_resources - setup all fcoe ddp context resources
745  * @adapter: ixgbe adapter
746  *
747  * Sets up ddp context resouces
748  *
749  * Returns : 0 indicates success or -EINVAL on failure
750  */
751 int ixgbe_setup_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
752 {
753 	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
754 	struct device *dev = &adapter->pdev->dev;
755 	void *buffer;
756 	dma_addr_t dma;
757 	unsigned int cpu;
758 
759 	/* do nothing if no DDP pools were allocated */
760 	if (!fcoe->ddp_pool)
761 		return 0;
762 
763 	/* Extra buffer to be shared by all DDPs for HW work around */
764 	buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_KERNEL);
765 	if (!buffer)
766 		return -ENOMEM;
767 
768 	dma = dma_map_single(dev, buffer, IXGBE_FCBUFF_MIN, DMA_FROM_DEVICE);
769 	if (dma_mapping_error(dev, dma)) {
770 		e_err(drv, "failed to map extra DDP buffer\n");
771 		kfree(buffer);
772 		return -ENOMEM;
773 	}
774 
775 	fcoe->extra_ddp_buffer = buffer;
776 	fcoe->extra_ddp_buffer_dma = dma;
777 
778 	/* allocate pci pool for each cpu */
779 	for_each_possible_cpu(cpu) {
780 		int err = ixgbe_fcoe_dma_pool_alloc(fcoe, dev, cpu);
781 		if (!err)
782 			continue;
783 
784 		e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
785 		ixgbe_free_fcoe_ddp_resources(adapter);
786 		return -ENOMEM;
787 	}
788 
789 	return 0;
790 }
791 
792 static int ixgbe_fcoe_ddp_enable(struct ixgbe_adapter *adapter)
793 {
794 	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
795 
796 	if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
797 		return -EINVAL;
798 
799 	fcoe->ddp_pool = alloc_percpu(struct ixgbe_fcoe_ddp_pool);
800 
801 	if (!fcoe->ddp_pool) {
802 		e_err(drv, "failed to allocate percpu DDP resources\n");
803 		return -ENOMEM;
804 	}
805 
806 	adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
807 	/* X550 has different DDP Max limit */
808 	if (adapter->hw.mac.type == ixgbe_mac_X550)
809 		adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX_X550 - 1;
810 
811 	return 0;
812 }
813 
814 static void ixgbe_fcoe_ddp_disable(struct ixgbe_adapter *adapter)
815 {
816 	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
817 
818 	adapter->netdev->fcoe_ddp_xid = 0;
819 
820 	if (!fcoe->ddp_pool)
821 		return;
822 
823 	free_percpu(fcoe->ddp_pool);
824 	fcoe->ddp_pool = NULL;
825 }
826 
827 /**
828  * ixgbe_fcoe_enable - turn on FCoE offload feature
829  * @netdev: the corresponding netdev
830  *
831  * Turns on FCoE offload feature in 82599.
832  *
833  * Returns : 0 indicates success or -EINVAL on failure
834  */
835 int ixgbe_fcoe_enable(struct net_device *netdev)
836 {
837 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
838 	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
839 
840 	atomic_inc(&fcoe->refcnt);
841 
842 	if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
843 		return -EINVAL;
844 
845 	if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
846 		return -EINVAL;
847 
848 	e_info(drv, "Enabling FCoE offload features.\n");
849 
850 	if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
851 		e_warn(probe, "Enabling FCoE on PF will disable legacy VFs\n");
852 
853 	if (netif_running(netdev))
854 		netdev->netdev_ops->ndo_stop(netdev);
855 
856 	/* Allocate per CPU memory to track DDP pools */
857 	ixgbe_fcoe_ddp_enable(adapter);
858 
859 	/* enable FCoE and notify stack */
860 	adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
861 	netdev->features |= NETIF_F_FCOE_MTU;
862 	netdev_features_change(netdev);
863 
864 	/* release existing queues and reallocate them */
865 	ixgbe_clear_interrupt_scheme(adapter);
866 	ixgbe_init_interrupt_scheme(adapter);
867 
868 	if (netif_running(netdev))
869 		netdev->netdev_ops->ndo_open(netdev);
870 
871 	return 0;
872 }
873 
874 /**
875  * ixgbe_fcoe_disable - turn off FCoE offload feature
876  * @netdev: the corresponding netdev
877  *
878  * Turns off FCoE offload feature in 82599.
879  *
880  * Returns : 0 indicates success or -EINVAL on failure
881  */
882 int ixgbe_fcoe_disable(struct net_device *netdev)
883 {
884 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
885 
886 	if (!atomic_dec_and_test(&adapter->fcoe.refcnt))
887 		return -EINVAL;
888 
889 	if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
890 		return -EINVAL;
891 
892 	e_info(drv, "Disabling FCoE offload features.\n");
893 	if (netif_running(netdev))
894 		netdev->netdev_ops->ndo_stop(netdev);
895 
896 	/* Free per CPU memory to track DDP pools */
897 	ixgbe_fcoe_ddp_disable(adapter);
898 
899 	/* disable FCoE and notify stack */
900 	adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
901 	netdev->features &= ~NETIF_F_FCOE_MTU;
902 
903 	netdev_features_change(netdev);
904 
905 	/* release existing queues and reallocate them */
906 	ixgbe_clear_interrupt_scheme(adapter);
907 	ixgbe_init_interrupt_scheme(adapter);
908 
909 	if (netif_running(netdev))
910 		netdev->netdev_ops->ndo_open(netdev);
911 
912 	return 0;
913 }
914 
915 /**
916  * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
917  * @netdev : ixgbe adapter
918  * @wwn : the world wide name
919  * @type: the type of world wide name
920  *
921  * Returns the node or port world wide name if both the prefix and the san
922  * mac address are valid, then the wwn is formed based on the NAA-2 for
923  * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
924  *
925  * Returns : 0 on success
926  */
927 int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
928 {
929 	u16 prefix = 0xffff;
930 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
931 	struct ixgbe_mac_info *mac = &adapter->hw.mac;
932 
933 	switch (type) {
934 	case NETDEV_FCOE_WWNN:
935 		prefix = mac->wwnn_prefix;
936 		break;
937 	case NETDEV_FCOE_WWPN:
938 		prefix = mac->wwpn_prefix;
939 		break;
940 	default:
941 		break;
942 	}
943 
944 	if ((prefix != 0xffff) &&
945 	    is_valid_ether_addr(mac->san_addr)) {
946 		*wwn = ((u64) prefix << 48) |
947 		       ((u64) mac->san_addr[0] << 40) |
948 		       ((u64) mac->san_addr[1] << 32) |
949 		       ((u64) mac->san_addr[2] << 24) |
950 		       ((u64) mac->san_addr[3] << 16) |
951 		       ((u64) mac->san_addr[4] << 8)  |
952 		       ((u64) mac->san_addr[5]);
953 		return 0;
954 	}
955 	return -EINVAL;
956 }
957 
958 /**
959  * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
960  * @netdev : ixgbe adapter
961  * @info : HBA information
962  *
963  * Returns ixgbe HBA information
964  *
965  * Returns : 0 on success
966  */
967 int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
968 			   struct netdev_fcoe_hbainfo *info)
969 {
970 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
971 	struct ixgbe_hw *hw = &adapter->hw;
972 	u64 dsn;
973 
974 	if (!info)
975 		return -EINVAL;
976 
977 	/* Don't return information on unsupported devices */
978 	if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
979 		return -EINVAL;
980 
981 	/* Manufacturer */
982 	snprintf(info->manufacturer, sizeof(info->manufacturer),
983 		 "Intel Corporation");
984 
985 	/* Serial Number */
986 
987 	/* Get the PCI-e Device Serial Number Capability */
988 	dsn = pci_get_dsn(adapter->pdev);
989 	if (dsn)
990 		snprintf(info->serial_number, sizeof(info->serial_number),
991 			 "%016llX", dsn);
992 	else
993 		snprintf(info->serial_number, sizeof(info->serial_number),
994 			 "Unknown");
995 
996 	/* Hardware Version */
997 	snprintf(info->hardware_version,
998 		 sizeof(info->hardware_version),
999 		 "Rev %d", hw->revision_id);
1000 	/* Driver Name/Version */
1001 	snprintf(info->driver_version,
1002 		 sizeof(info->driver_version),
1003 		 "%s v%s",
1004 		 ixgbe_driver_name,
1005 		 UTS_RELEASE);
1006 	/* Firmware Version */
1007 	strscpy(info->firmware_version, adapter->eeprom_id,
1008 		sizeof(info->firmware_version));
1009 
1010 	/* Model */
1011 	if (hw->mac.type == ixgbe_mac_82599EB) {
1012 		snprintf(info->model,
1013 			 sizeof(info->model),
1014 			 "Intel 82599");
1015 	} else if (hw->mac.type == ixgbe_mac_X550) {
1016 		snprintf(info->model,
1017 			 sizeof(info->model),
1018 			 "Intel X550");
1019 	} else {
1020 		snprintf(info->model,
1021 			 sizeof(info->model),
1022 			 "Intel X540");
1023 	}
1024 
1025 	/* Model Description */
1026 	snprintf(info->model_description,
1027 		 sizeof(info->model_description),
1028 		 "%s",
1029 		 ixgbe_default_device_descr);
1030 
1031 	return 0;
1032 }
1033 
1034 /**
1035  * ixgbe_fcoe_get_tc - get the current TC that fcoe is mapped to
1036  * @adapter: pointer to the device adapter structure
1037  *
1038  * Return : TC that FCoE is mapped to
1039  */
1040 u8 ixgbe_fcoe_get_tc(struct ixgbe_adapter *adapter)
1041 {
1042 #ifdef CONFIG_IXGBE_DCB
1043 	return netdev_get_prio_tc_map(adapter->netdev, adapter->fcoe.up);
1044 #else
1045 	return 0;
1046 #endif
1047 }
1048