aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/cxgb4/sge.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/cxgb4/sge.c')
-rw-r--r--drivers/net/cxgb4/sge.c2431
1 files changed, 2431 insertions, 0 deletions
diff --git a/drivers/net/cxgb4/sge.c b/drivers/net/cxgb4/sge.c
new file mode 100644
index 000000000000..14adc58e71c3
--- /dev/null
+++ b/drivers/net/cxgb4/sge.c
@@ -0,0 +1,2431 @@
1/*
2 * This file is part of the Chelsio T4 Ethernet driver for Linux.
3 *
4 * Copyright (c) 2003-2010 Chelsio Communications, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35#include <linux/skbuff.h>
36#include <linux/netdevice.h>
37#include <linux/etherdevice.h>
38#include <linux/if_vlan.h>
39#include <linux/ip.h>
40#include <linux/dma-mapping.h>
41#include <linux/jiffies.h>
42#include <net/ipv6.h>
43#include <net/tcp.h>
44#include "cxgb4.h"
45#include "t4_regs.h"
46#include "t4_msg.h"
47#include "t4fw_api.h"
48
49/*
50 * Rx buffer size. We use largish buffers if possible but settle for single
51 * pages under memory shortage.
52 */
53#if PAGE_SHIFT >= 16
54# define FL_PG_ORDER 0
55#else
56# define FL_PG_ORDER (16 - PAGE_SHIFT)
57#endif
58
59/* RX_PULL_LEN should be <= RX_COPY_THRES */
60#define RX_COPY_THRES 256
61#define RX_PULL_LEN 128
62
63/*
64 * Main body length for sk_buffs used for Rx Ethernet packets with fragments.
65 * Should be >= RX_PULL_LEN but possibly bigger to give pskb_may_pull some room.
66 */
67#define RX_PKT_SKB_LEN 512
68
69/* Ethernet header padding prepended to RX_PKTs */
70#define RX_PKT_PAD 2
71
72/*
73 * Max number of Tx descriptors we clean up at a time. Should be modest as
74 * freeing skbs isn't cheap and it happens while holding locks. We just need
75 * to free packets faster than they arrive, we eventually catch up and keep
76 * the amortized cost reasonable. Must be >= 2 * TXQ_STOP_THRES.
77 */
78#define MAX_TX_RECLAIM 16
79
80/*
81 * Max number of Rx buffers we replenish at a time. Again keep this modest,
82 * allocating buffers isn't cheap either.
83 */
84#define MAX_RX_REFILL 16U
85
86/*
87 * Period of the Rx queue check timer. This timer is infrequent as it has
88 * something to do only when the system experiences severe memory shortage.
89 */
90#define RX_QCHECK_PERIOD (HZ / 2)
91
92/*
93 * Period of the Tx queue check timer.
94 */
95#define TX_QCHECK_PERIOD (HZ / 2)
96
97/*
98 * Max number of Tx descriptors to be reclaimed by the Tx timer.
99 */
100#define MAX_TIMER_TX_RECLAIM 100
101
102/*
103 * Timer index used when backing off due to memory shortage.
104 */
105#define NOMEM_TMR_IDX (SGE_NTIMERS - 1)
106
107/*
108 * An FL with <= FL_STARVE_THRES buffers is starving and a periodic timer will
109 * attempt to refill it.
110 */
111#define FL_STARVE_THRES 4
112
113/*
114 * Suspend an Ethernet Tx queue with fewer available descriptors than this.
115 * This is the same as calc_tx_descs() for a TSO packet with
116 * nr_frags == MAX_SKB_FRAGS.
117 */
118#define ETHTXQ_STOP_THRES \
119 (1 + DIV_ROUND_UP((3 * MAX_SKB_FRAGS) / 2 + (MAX_SKB_FRAGS & 1), 8))
120
121/*
122 * Suspension threshold for non-Ethernet Tx queues. We require enough room
123 * for a full sized WR.
124 */
125#define TXQ_STOP_THRES (SGE_MAX_WR_LEN / sizeof(struct tx_desc))
126
127/*
128 * Max Tx descriptor space we allow for an Ethernet packet to be inlined
129 * into a WR.
130 */
131#define MAX_IMM_TX_PKT_LEN 128
132
133/*
134 * Max size of a WR sent through a control Tx queue.
135 */
136#define MAX_CTRL_WR_LEN SGE_MAX_WR_LEN
137
138enum {
139 /* packet alignment in FL buffers */
140 FL_ALIGN = L1_CACHE_BYTES < 32 ? 32 : L1_CACHE_BYTES,
141 /* egress status entry size */
142 STAT_LEN = L1_CACHE_BYTES > 64 ? 128 : 64
143};
144
145struct tx_sw_desc { /* SW state per Tx descriptor */
146 struct sk_buff *skb;
147 struct ulptx_sgl *sgl;
148};
149
150struct rx_sw_desc { /* SW state per Rx descriptor */
151 struct page *page;
152 dma_addr_t dma_addr;
153};
154
155/*
156 * The low bits of rx_sw_desc.dma_addr have special meaning.
157 */
158enum {
159 RX_LARGE_BUF = 1 << 0, /* buffer is larger than PAGE_SIZE */
160 RX_UNMAPPED_BUF = 1 << 1, /* buffer is not mapped */
161};
162
163static inline dma_addr_t get_buf_addr(const struct rx_sw_desc *d)
164{
165 return d->dma_addr & ~(dma_addr_t)(RX_LARGE_BUF | RX_UNMAPPED_BUF);
166}
167
168static inline bool is_buf_mapped(const struct rx_sw_desc *d)
169{
170 return !(d->dma_addr & RX_UNMAPPED_BUF);
171}
172
173/**
174 * txq_avail - return the number of available slots in a Tx queue
175 * @q: the Tx queue
176 *
177 * Returns the number of descriptors in a Tx queue available to write new
178 * packets.
179 */
180static inline unsigned int txq_avail(const struct sge_txq *q)
181{
182 return q->size - 1 - q->in_use;
183}
184
185/**
186 * fl_cap - return the capacity of a free-buffer list
187 * @fl: the FL
188 *
189 * Returns the capacity of a free-buffer list. The capacity is less than
190 * the size because one descriptor needs to be left unpopulated, otherwise
191 * HW will think the FL is empty.
192 */
193static inline unsigned int fl_cap(const struct sge_fl *fl)
194{
195 return fl->size - 8; /* 1 descriptor = 8 buffers */
196}
197
198static inline bool fl_starving(const struct sge_fl *fl)
199{
200 return fl->avail - fl->pend_cred <= FL_STARVE_THRES;
201}
202
203static int map_skb(struct device *dev, const struct sk_buff *skb,
204 dma_addr_t *addr)
205{
206 const skb_frag_t *fp, *end;
207 const struct skb_shared_info *si;
208
209 *addr = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
210 if (dma_mapping_error(dev, *addr))
211 goto out_err;
212
213 si = skb_shinfo(skb);
214 end = &si->frags[si->nr_frags];
215
216 for (fp = si->frags; fp < end; fp++) {
217 *++addr = dma_map_page(dev, fp->page, fp->page_offset, fp->size,
218 DMA_TO_DEVICE);
219 if (dma_mapping_error(dev, *addr))
220 goto unwind;
221 }
222 return 0;
223
224unwind:
225 while (fp-- > si->frags)
226 dma_unmap_page(dev, *--addr, fp->size, DMA_TO_DEVICE);
227
228 dma_unmap_single(dev, addr[-1], skb_headlen(skb), DMA_TO_DEVICE);
229out_err:
230 return -ENOMEM;
231}
232
233#ifdef CONFIG_NEED_DMA_MAP_STATE
234static void unmap_skb(struct device *dev, const struct sk_buff *skb,
235 const dma_addr_t *addr)
236{
237 const skb_frag_t *fp, *end;
238 const struct skb_shared_info *si;
239
240 dma_unmap_single(dev, *addr++, skb_headlen(skb), DMA_TO_DEVICE);
241
242 si = skb_shinfo(skb);
243 end = &si->frags[si->nr_frags];
244 for (fp = si->frags; fp < end; fp++)
245 dma_unmap_page(dev, *addr++, fp->size, DMA_TO_DEVICE);
246}
247
248/**
249 * deferred_unmap_destructor - unmap a packet when it is freed
250 * @skb: the packet
251 *
252 * This is the packet destructor used for Tx packets that need to remain
253 * mapped until they are freed rather than until their Tx descriptors are
254 * freed.
255 */
256static void deferred_unmap_destructor(struct sk_buff *skb)
257{
258 unmap_skb(skb->dev->dev.parent, skb, (dma_addr_t *)skb->head);
259}
260#endif
261
262static void unmap_sgl(struct device *dev, const struct sk_buff *skb,
263 const struct ulptx_sgl *sgl, const struct sge_txq *q)
264{
265 const struct ulptx_sge_pair *p;
266 unsigned int nfrags = skb_shinfo(skb)->nr_frags;
267
268 if (likely(skb_headlen(skb)))
269 dma_unmap_single(dev, be64_to_cpu(sgl->addr0), ntohl(sgl->len0),
270 DMA_TO_DEVICE);
271 else {
272 dma_unmap_page(dev, be64_to_cpu(sgl->addr0), ntohl(sgl->len0),
273 DMA_TO_DEVICE);
274 nfrags--;
275 }
276
277 /*
278 * the complexity below is because of the possibility of a wrap-around
279 * in the middle of an SGL
280 */
281 for (p = sgl->sge; nfrags >= 2; nfrags -= 2) {
282 if (likely((u8 *)(p + 1) <= (u8 *)q->stat)) {
283unmap: dma_unmap_page(dev, be64_to_cpu(p->addr[0]),
284 ntohl(p->len[0]), DMA_TO_DEVICE);
285 dma_unmap_page(dev, be64_to_cpu(p->addr[1]),
286 ntohl(p->len[1]), DMA_TO_DEVICE);
287 p++;
288 } else if ((u8 *)p == (u8 *)q->stat) {
289 p = (const struct ulptx_sge_pair *)q->desc;
290 goto unmap;
291 } else if ((u8 *)p + 8 == (u8 *)q->stat) {
292 const __be64 *addr = (const __be64 *)q->desc;
293
294 dma_unmap_page(dev, be64_to_cpu(addr[0]),
295 ntohl(p->len[0]), DMA_TO_DEVICE);
296 dma_unmap_page(dev, be64_to_cpu(addr[1]),
297 ntohl(p->len[1]), DMA_TO_DEVICE);
298 p = (const struct ulptx_sge_pair *)&addr[2];
299 } else {
300 const __be64 *addr = (const __be64 *)q->desc;
301
302 dma_unmap_page(dev, be64_to_cpu(p->addr[0]),
303 ntohl(p->len[0]), DMA_TO_DEVICE);
304 dma_unmap_page(dev, be64_to_cpu(addr[0]),
305 ntohl(p->len[1]), DMA_TO_DEVICE);
306 p = (const struct ulptx_sge_pair *)&addr[1];
307 }
308 }
309 if (nfrags) {
310 __be64 addr;
311
312 if ((u8 *)p == (u8 *)q->stat)
313 p = (const struct ulptx_sge_pair *)q->desc;
314 addr = (u8 *)p + 16 <= (u8 *)q->stat ? p->addr[0] :
315 *(const __be64 *)q->desc;
316 dma_unmap_page(dev, be64_to_cpu(addr), ntohl(p->len[0]),
317 DMA_TO_DEVICE);
318 }
319}
320
321/**
322 * free_tx_desc - reclaims Tx descriptors and their buffers
323 * @adapter: the adapter
324 * @q: the Tx queue to reclaim descriptors from
325 * @n: the number of descriptors to reclaim
326 * @unmap: whether the buffers should be unmapped for DMA
327 *
328 * Reclaims Tx descriptors from an SGE Tx queue and frees the associated
329 * Tx buffers. Called with the Tx queue lock held.
330 */
331static void free_tx_desc(struct adapter *adap, struct sge_txq *q,
332 unsigned int n, bool unmap)
333{
334 struct tx_sw_desc *d;
335 unsigned int cidx = q->cidx;
336 struct device *dev = adap->pdev_dev;
337
338 d = &q->sdesc[cidx];
339 while (n--) {
340 if (d->skb) { /* an SGL is present */
341 if (unmap)
342 unmap_sgl(dev, d->skb, d->sgl, q);
343 kfree_skb(d->skb);
344 d->skb = NULL;
345 }
346 ++d;
347 if (++cidx == q->size) {
348 cidx = 0;
349 d = q->sdesc;
350 }
351 }
352 q->cidx = cidx;
353}
354
355/*
356 * Return the number of reclaimable descriptors in a Tx queue.
357 */
358static inline int reclaimable(const struct sge_txq *q)
359{
360 int hw_cidx = ntohs(q->stat->cidx);
361 hw_cidx -= q->cidx;
362 return hw_cidx < 0 ? hw_cidx + q->size : hw_cidx;
363}
364
365/**
366 * reclaim_completed_tx - reclaims completed Tx descriptors
367 * @adap: the adapter
368 * @q: the Tx queue to reclaim completed descriptors from
369 * @unmap: whether the buffers should be unmapped for DMA
370 *
371 * Reclaims Tx descriptors that the SGE has indicated it has processed,
372 * and frees the associated buffers if possible. Called with the Tx
373 * queue locked.
374 */
375static inline void reclaim_completed_tx(struct adapter *adap, struct sge_txq *q,
376 bool unmap)
377{
378 int avail = reclaimable(q);
379
380 if (avail) {
381 /*
382 * Limit the amount of clean up work we do at a time to keep
383 * the Tx lock hold time O(1).
384 */
385 if (avail > MAX_TX_RECLAIM)
386 avail = MAX_TX_RECLAIM;
387
388 free_tx_desc(adap, q, avail, unmap);
389 q->in_use -= avail;
390 }
391}
392
393static inline int get_buf_size(const struct rx_sw_desc *d)
394{
395#if FL_PG_ORDER > 0
396 return (d->dma_addr & RX_LARGE_BUF) ? (PAGE_SIZE << FL_PG_ORDER) :
397 PAGE_SIZE;
398#else
399 return PAGE_SIZE;
400#endif
401}
402
403/**
404 * free_rx_bufs - free the Rx buffers on an SGE free list
405 * @adap: the adapter
406 * @q: the SGE free list to free buffers from
407 * @n: how many buffers to free
408 *
409 * Release the next @n buffers on an SGE free-buffer Rx queue. The
410 * buffers must be made inaccessible to HW before calling this function.
411 */
412static void free_rx_bufs(struct adapter *adap, struct sge_fl *q, int n)
413{
414 while (n--) {
415 struct rx_sw_desc *d = &q->sdesc[q->cidx];
416
417 if (is_buf_mapped(d))
418 dma_unmap_page(adap->pdev_dev, get_buf_addr(d),
419 get_buf_size(d), PCI_DMA_FROMDEVICE);
420 put_page(d->page);
421 d->page = NULL;
422 if (++q->cidx == q->size)
423 q->cidx = 0;
424 q->avail--;
425 }
426}
427
428/**
429 * unmap_rx_buf - unmap the current Rx buffer on an SGE free list
430 * @adap: the adapter
431 * @q: the SGE free list
432 *
433 * Unmap the current buffer on an SGE free-buffer Rx queue. The
434 * buffer must be made inaccessible to HW before calling this function.
435 *
436 * This is similar to @free_rx_bufs above but does not free the buffer.
437 * Do note that the FL still loses any further access to the buffer.
438 */
439static void unmap_rx_buf(struct adapter *adap, struct sge_fl *q)
440{
441 struct rx_sw_desc *d = &q->sdesc[q->cidx];
442
443 if (is_buf_mapped(d))
444 dma_unmap_page(adap->pdev_dev, get_buf_addr(d),
445 get_buf_size(d), PCI_DMA_FROMDEVICE);
446 d->page = NULL;
447 if (++q->cidx == q->size)
448 q->cidx = 0;
449 q->avail--;
450}
451
452static inline void ring_fl_db(struct adapter *adap, struct sge_fl *q)
453{
454 if (q->pend_cred >= 8) {
455 wmb();
456 t4_write_reg(adap, MYPF_REG(SGE_PF_KDOORBELL), DBPRIO |
457 QID(q->cntxt_id) | PIDX(q->pend_cred / 8));
458 q->pend_cred &= 7;
459 }
460}
461
462static inline void set_rx_sw_desc(struct rx_sw_desc *sd, struct page *pg,
463 dma_addr_t mapping)
464{
465 sd->page = pg;
466 sd->dma_addr = mapping; /* includes size low bits */
467}
468
469/**
470 * refill_fl - refill an SGE Rx buffer ring
471 * @adap: the adapter
472 * @q: the ring to refill
473 * @n: the number of new buffers to allocate
474 * @gfp: the gfp flags for the allocations
475 *
476 * (Re)populate an SGE free-buffer queue with up to @n new packet buffers,
477 * allocated with the supplied gfp flags. The caller must assure that
478 * @n does not exceed the queue's capacity. If afterwards the queue is
479 * found critically low mark it as starving in the bitmap of starving FLs.
480 *
481 * Returns the number of buffers allocated.
482 */
483static unsigned int refill_fl(struct adapter *adap, struct sge_fl *q, int n,
484 gfp_t gfp)
485{
486 struct page *pg;
487 dma_addr_t mapping;
488 unsigned int cred = q->avail;
489 __be64 *d = &q->desc[q->pidx];
490 struct rx_sw_desc *sd = &q->sdesc[q->pidx];
491
492 gfp |= __GFP_NOWARN; /* failures are expected */
493
494#if FL_PG_ORDER > 0
495 /*
496 * Prefer large buffers
497 */
498 while (n) {
499 pg = alloc_pages(gfp | __GFP_COMP, FL_PG_ORDER);
500 if (unlikely(!pg)) {
501 q->large_alloc_failed++;
502 break; /* fall back to single pages */
503 }
504
505 mapping = dma_map_page(adap->pdev_dev, pg, 0,
506 PAGE_SIZE << FL_PG_ORDER,
507 PCI_DMA_FROMDEVICE);
508 if (unlikely(dma_mapping_error(adap->pdev_dev, mapping))) {
509 __free_pages(pg, FL_PG_ORDER);
510 goto out; /* do not try small pages for this error */
511 }
512 mapping |= RX_LARGE_BUF;
513 *d++ = cpu_to_be64(mapping);
514
515 set_rx_sw_desc(sd, pg, mapping);
516 sd++;
517
518 q->avail++;
519 if (++q->pidx == q->size) {
520 q->pidx = 0;
521 sd = q->sdesc;
522 d = q->desc;
523 }
524 n--;
525 }
526#endif
527
528 while (n--) {
529 pg = __netdev_alloc_page(adap->port[0], gfp);
530 if (unlikely(!pg)) {
531 q->alloc_failed++;
532 break;
533 }
534
535 mapping = dma_map_page(adap->pdev_dev, pg, 0, PAGE_SIZE,
536 PCI_DMA_FROMDEVICE);
537 if (unlikely(dma_mapping_error(adap->pdev_dev, mapping))) {
538 netdev_free_page(adap->port[0], pg);
539 goto out;
540 }
541 *d++ = cpu_to_be64(mapping);
542
543 set_rx_sw_desc(sd, pg, mapping);
544 sd++;
545
546 q->avail++;
547 if (++q->pidx == q->size) {
548 q->pidx = 0;
549 sd = q->sdesc;
550 d = q->desc;
551 }
552 }
553
554out: cred = q->avail - cred;
555 q->pend_cred += cred;
556 ring_fl_db(adap, q);
557
558 if (unlikely(fl_starving(q))) {
559 smp_wmb();
560 set_bit(q->cntxt_id, adap->sge.starving_fl);
561 }
562
563 return cred;
564}
565
566static inline void __refill_fl(struct adapter *adap, struct sge_fl *fl)
567{
568 refill_fl(adap, fl, min(MAX_RX_REFILL, fl_cap(fl) - fl->avail),
569 GFP_ATOMIC);
570}
571
572/**
573 * alloc_ring - allocate resources for an SGE descriptor ring
574 * @dev: the PCI device's core device
575 * @nelem: the number of descriptors
576 * @elem_size: the size of each descriptor
577 * @sw_size: the size of the SW state associated with each ring element
578 * @phys: the physical address of the allocated ring
579 * @metadata: address of the array holding the SW state for the ring
580 * @stat_size: extra space in HW ring for status information
581 *
582 * Allocates resources for an SGE descriptor ring, such as Tx queues,
583 * free buffer lists, or response queues. Each SGE ring requires
584 * space for its HW descriptors plus, optionally, space for the SW state
585 * associated with each HW entry (the metadata). The function returns
586 * three values: the virtual address for the HW ring (the return value
587 * of the function), the bus address of the HW ring, and the address
588 * of the SW ring.
589 */
590static void *alloc_ring(struct device *dev, size_t nelem, size_t elem_size,
591 size_t sw_size, dma_addr_t *phys, void *metadata,
592 size_t stat_size)
593{
594 size_t len = nelem * elem_size + stat_size;
595 void *s = NULL;
596 void *p = dma_alloc_coherent(dev, len, phys, GFP_KERNEL);
597
598 if (!p)
599 return NULL;
600 if (sw_size) {
601 s = kcalloc(nelem, sw_size, GFP_KERNEL);
602
603 if (!s) {
604 dma_free_coherent(dev, len, p, *phys);
605 return NULL;
606 }
607 }
608 if (metadata)
609 *(void **)metadata = s;
610 memset(p, 0, len);
611 return p;
612}
613
614/**
615 * sgl_len - calculates the size of an SGL of the given capacity
616 * @n: the number of SGL entries
617 *
618 * Calculates the number of flits needed for a scatter/gather list that
619 * can hold the given number of entries.
620 */
621static inline unsigned int sgl_len(unsigned int n)
622{
623 n--;
624 return (3 * n) / 2 + (n & 1) + 2;
625}
626
627/**
628 * flits_to_desc - returns the num of Tx descriptors for the given flits
629 * @n: the number of flits
630 *
631 * Returns the number of Tx descriptors needed for the supplied number
632 * of flits.
633 */
634static inline unsigned int flits_to_desc(unsigned int n)
635{
636 BUG_ON(n > SGE_MAX_WR_LEN / 8);
637 return DIV_ROUND_UP(n, 8);
638}
639
640/**
641 * is_eth_imm - can an Ethernet packet be sent as immediate data?
642 * @skb: the packet
643 *
644 * Returns whether an Ethernet packet is small enough to fit as
645 * immediate data.
646 */
647static inline int is_eth_imm(const struct sk_buff *skb)
648{
649 return skb->len <= MAX_IMM_TX_PKT_LEN - sizeof(struct cpl_tx_pkt);
650}
651
652/**
653 * calc_tx_flits - calculate the number of flits for a packet Tx WR
654 * @skb: the packet
655 *
656 * Returns the number of flits needed for a Tx WR for the given Ethernet
657 * packet, including the needed WR and CPL headers.
658 */
659static inline unsigned int calc_tx_flits(const struct sk_buff *skb)
660{
661 unsigned int flits;
662
663 if (is_eth_imm(skb))
664 return DIV_ROUND_UP(skb->len + sizeof(struct cpl_tx_pkt), 8);
665
666 flits = sgl_len(skb_shinfo(skb)->nr_frags + 1) + 4;
667 if (skb_shinfo(skb)->gso_size)
668 flits += 2;
669 return flits;
670}
671
672/**
673 * calc_tx_descs - calculate the number of Tx descriptors for a packet
674 * @skb: the packet
675 *
676 * Returns the number of Tx descriptors needed for the given Ethernet
677 * packet, including the needed WR and CPL headers.
678 */
679static inline unsigned int calc_tx_descs(const struct sk_buff *skb)
680{
681 return flits_to_desc(calc_tx_flits(skb));
682}
683
684/**
685 * write_sgl - populate a scatter/gather list for a packet
686 * @skb: the packet
687 * @q: the Tx queue we are writing into
688 * @sgl: starting location for writing the SGL
689 * @end: points right after the end of the SGL
690 * @start: start offset into skb main-body data to include in the SGL
691 * @addr: the list of bus addresses for the SGL elements
692 *
693 * Generates a gather list for the buffers that make up a packet.
694 * The caller must provide adequate space for the SGL that will be written.
695 * The SGL includes all of the packet's page fragments and the data in its
696 * main body except for the first @start bytes. @sgl must be 16-byte
697 * aligned and within a Tx descriptor with available space. @end points
698 * right after the end of the SGL but does not account for any potential
699 * wrap around, i.e., @end > @sgl.
700 */
701static void write_sgl(const struct sk_buff *skb, struct sge_txq *q,
702 struct ulptx_sgl *sgl, u64 *end, unsigned int start,
703 const dma_addr_t *addr)
704{
705 unsigned int i, len;
706 struct ulptx_sge_pair *to;
707 const struct skb_shared_info *si = skb_shinfo(skb);
708 unsigned int nfrags = si->nr_frags;
709 struct ulptx_sge_pair buf[MAX_SKB_FRAGS / 2 + 1];
710
711 len = skb_headlen(skb) - start;
712 if (likely(len)) {
713 sgl->len0 = htonl(len);
714 sgl->addr0 = cpu_to_be64(addr[0] + start);
715 nfrags++;
716 } else {
717 sgl->len0 = htonl(si->frags[0].size);
718 sgl->addr0 = cpu_to_be64(addr[1]);
719 }
720
721 sgl->cmd_nsge = htonl(ULPTX_CMD(ULP_TX_SC_DSGL) | ULPTX_NSGE(nfrags));
722 if (likely(--nfrags == 0))
723 return;
724 /*
725 * Most of the complexity below deals with the possibility we hit the
726 * end of the queue in the middle of writing the SGL. For this case
727 * only we create the SGL in a temporary buffer and then copy it.
728 */
729 to = (u8 *)end > (u8 *)q->stat ? buf : sgl->sge;
730
731 for (i = (nfrags != si->nr_frags); nfrags >= 2; nfrags -= 2, to++) {
732 to->len[0] = cpu_to_be32(si->frags[i].size);
733 to->len[1] = cpu_to_be32(si->frags[++i].size);
734 to->addr[0] = cpu_to_be64(addr[i]);
735 to->addr[1] = cpu_to_be64(addr[++i]);
736 }
737 if (nfrags) {
738 to->len[0] = cpu_to_be32(si->frags[i].size);
739 to->len[1] = cpu_to_be32(0);
740 to->addr[0] = cpu_to_be64(addr[i + 1]);
741 }
742 if (unlikely((u8 *)end > (u8 *)q->stat)) {
743 unsigned int part0 = (u8 *)q->stat - (u8 *)sgl->sge, part1;
744
745 if (likely(part0))
746 memcpy(sgl->sge, buf, part0);
747 part1 = (u8 *)end - (u8 *)q->stat;
748 memcpy(q->desc, (u8 *)buf + part0, part1);
749 end = (void *)q->desc + part1;
750 }
751 if ((uintptr_t)end & 8) /* 0-pad to multiple of 16 */
752 *(u64 *)end = 0;
753}
754
755/**
756 * ring_tx_db - check and potentially ring a Tx queue's doorbell
757 * @adap: the adapter
758 * @q: the Tx queue
759 * @n: number of new descriptors to give to HW
760 *
761 * Ring the doorbel for a Tx queue.
762 */
763static inline void ring_tx_db(struct adapter *adap, struct sge_txq *q, int n)
764{
765 wmb(); /* write descriptors before telling HW */
766 t4_write_reg(adap, MYPF_REG(SGE_PF_KDOORBELL),
767 QID(q->cntxt_id) | PIDX(n));
768}
769
770/**
771 * inline_tx_skb - inline a packet's data into Tx descriptors
772 * @skb: the packet
773 * @q: the Tx queue where the packet will be inlined
774 * @pos: starting position in the Tx queue where to inline the packet
775 *
776 * Inline a packet's contents directly into Tx descriptors, starting at
777 * the given position within the Tx DMA ring.
778 * Most of the complexity of this operation is dealing with wrap arounds
779 * in the middle of the packet we want to inline.
780 */
781static void inline_tx_skb(const struct sk_buff *skb, const struct sge_txq *q,
782 void *pos)
783{
784 u64 *p;
785 int left = (void *)q->stat - pos;
786
787 if (likely(skb->len <= left)) {
788 if (likely(!skb->data_len))
789 skb_copy_from_linear_data(skb, pos, skb->len);
790 else
791 skb_copy_bits(skb, 0, pos, skb->len);
792 pos += skb->len;
793 } else {
794 skb_copy_bits(skb, 0, pos, left);
795 skb_copy_bits(skb, left, q->desc, skb->len - left);
796 pos = (void *)q->desc + (skb->len - left);
797 }
798
799 /* 0-pad to multiple of 16 */
800 p = PTR_ALIGN(pos, 8);
801 if ((uintptr_t)p & 8)
802 *p = 0;
803}
804
805/*
806 * Figure out what HW csum a packet wants and return the appropriate control
807 * bits.
808 */
809static u64 hwcsum(const struct sk_buff *skb)
810{
811 int csum_type;
812 const struct iphdr *iph = ip_hdr(skb);
813
814 if (iph->version == 4) {
815 if (iph->protocol == IPPROTO_TCP)
816 csum_type = TX_CSUM_TCPIP;
817 else if (iph->protocol == IPPROTO_UDP)
818 csum_type = TX_CSUM_UDPIP;
819 else {
820nocsum: /*
821 * unknown protocol, disable HW csum
822 * and hope a bad packet is detected
823 */
824 return TXPKT_L4CSUM_DIS;
825 }
826 } else {
827 /*
828 * this doesn't work with extension headers
829 */
830 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)iph;
831
832 if (ip6h->nexthdr == IPPROTO_TCP)
833 csum_type = TX_CSUM_TCPIP6;
834 else if (ip6h->nexthdr == IPPROTO_UDP)
835 csum_type = TX_CSUM_UDPIP6;
836 else
837 goto nocsum;
838 }
839
840 if (likely(csum_type >= TX_CSUM_TCPIP))
841 return TXPKT_CSUM_TYPE(csum_type) |
842 TXPKT_IPHDR_LEN(skb_network_header_len(skb)) |
843 TXPKT_ETHHDR_LEN(skb_network_offset(skb) - ETH_HLEN);
844 else {
845 int start = skb_transport_offset(skb);
846
847 return TXPKT_CSUM_TYPE(csum_type) | TXPKT_CSUM_START(start) |
848 TXPKT_CSUM_LOC(start + skb->csum_offset);
849 }
850}
851
852static void eth_txq_stop(struct sge_eth_txq *q)
853{
854 netif_tx_stop_queue(q->txq);
855 q->q.stops++;
856}
857
858static inline void txq_advance(struct sge_txq *q, unsigned int n)
859{
860 q->in_use += n;
861 q->pidx += n;
862 if (q->pidx >= q->size)
863 q->pidx -= q->size;
864}
865
866/**
867 * t4_eth_xmit - add a packet to an Ethernet Tx queue
868 * @skb: the packet
869 * @dev: the egress net device
870 *
871 * Add a packet to an SGE Ethernet Tx queue. Runs with softirqs disabled.
872 */
873netdev_tx_t t4_eth_xmit(struct sk_buff *skb, struct net_device *dev)
874{
875 u32 wr_mid;
876 u64 cntrl, *end;
877 int qidx, credits;
878 unsigned int flits, ndesc;
879 struct adapter *adap;
880 struct sge_eth_txq *q;
881 const struct port_info *pi;
882 struct fw_eth_tx_pkt_wr *wr;
883 struct cpl_tx_pkt_core *cpl;
884 const struct skb_shared_info *ssi;
885 dma_addr_t addr[MAX_SKB_FRAGS + 1];
886
887 /*
888 * The chip min packet length is 10 octets but play safe and reject
889 * anything shorter than an Ethernet header.
890 */
891 if (unlikely(skb->len < ETH_HLEN)) {
892out_free: dev_kfree_skb(skb);
893 return NETDEV_TX_OK;
894 }
895
896 pi = netdev_priv(dev);
897 adap = pi->adapter;
898 qidx = skb_get_queue_mapping(skb);
899 q = &adap->sge.ethtxq[qidx + pi->first_qset];
900
901 reclaim_completed_tx(adap, &q->q, true);
902
903 flits = calc_tx_flits(skb);
904 ndesc = flits_to_desc(flits);
905 credits = txq_avail(&q->q) - ndesc;
906
907 if (unlikely(credits < 0)) {
908 eth_txq_stop(q);
909 dev_err(adap->pdev_dev,
910 "%s: Tx ring %u full while queue awake!\n",
911 dev->name, qidx);
912 return NETDEV_TX_BUSY;
913 }
914
915 if (!is_eth_imm(skb) &&
916 unlikely(map_skb(adap->pdev_dev, skb, addr) < 0)) {
917 q->mapping_err++;
918 goto out_free;
919 }
920
921 wr_mid = FW_WR_LEN16(DIV_ROUND_UP(flits, 2));
922 if (unlikely(credits < ETHTXQ_STOP_THRES)) {
923 eth_txq_stop(q);
924 wr_mid |= FW_WR_EQUEQ | FW_WR_EQUIQ;
925 }
926
927 wr = (void *)&q->q.desc[q->q.pidx];
928 wr->equiq_to_len16 = htonl(wr_mid);
929 wr->r3 = cpu_to_be64(0);
930 end = (u64 *)wr + flits;
931
932 ssi = skb_shinfo(skb);
933 if (ssi->gso_size) {
934 struct cpl_tx_pkt_lso *lso = (void *)wr;
935 bool v6 = (ssi->gso_type & SKB_GSO_TCPV6) != 0;
936 int l3hdr_len = skb_network_header_len(skb);
937 int eth_xtra_len = skb_network_offset(skb) - ETH_HLEN;
938
939 wr->op_immdlen = htonl(FW_WR_OP(FW_ETH_TX_PKT_WR) |
940 FW_WR_IMMDLEN(sizeof(*lso)));
941 lso->lso_ctrl = htonl(LSO_OPCODE(CPL_TX_PKT_LSO) |
942 LSO_FIRST_SLICE | LSO_LAST_SLICE |
943 LSO_IPV6(v6) |
944 LSO_ETHHDR_LEN(eth_xtra_len / 4) |
945 LSO_IPHDR_LEN(l3hdr_len / 4) |
946 LSO_TCPHDR_LEN(tcp_hdr(skb)->doff));
947 lso->ipid_ofst = htons(0);
948 lso->mss = htons(ssi->gso_size);
949 lso->seqno_offset = htonl(0);
950 lso->len = htonl(skb->len);
951 cpl = (void *)(lso + 1);
952 cntrl = TXPKT_CSUM_TYPE(v6 ? TX_CSUM_TCPIP6 : TX_CSUM_TCPIP) |
953 TXPKT_IPHDR_LEN(l3hdr_len) |
954 TXPKT_ETHHDR_LEN(eth_xtra_len);
955 q->tso++;
956 q->tx_cso += ssi->gso_segs;
957 } else {
958 int len;
959
960 len = is_eth_imm(skb) ? skb->len + sizeof(*cpl) : sizeof(*cpl);
961 wr->op_immdlen = htonl(FW_WR_OP(FW_ETH_TX_PKT_WR) |
962 FW_WR_IMMDLEN(len));
963 cpl = (void *)(wr + 1);
964 if (skb->ip_summed == CHECKSUM_PARTIAL) {
965 cntrl = hwcsum(skb) | TXPKT_IPCSUM_DIS;
966 q->tx_cso++;
967 } else
968 cntrl = TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS;
969 }
970
971 if (vlan_tx_tag_present(skb)) {
972 q->vlan_ins++;
973 cntrl |= TXPKT_VLAN_VLD | TXPKT_VLAN(vlan_tx_tag_get(skb));
974 }
975
976 cpl->ctrl0 = htonl(TXPKT_OPCODE(CPL_TX_PKT_XT) |
977 TXPKT_INTF(pi->tx_chan) | TXPKT_PF(0));
978 cpl->pack = htons(0);
979 cpl->len = htons(skb->len);
980 cpl->ctrl1 = cpu_to_be64(cntrl);
981
982 if (is_eth_imm(skb)) {
983 inline_tx_skb(skb, &q->q, cpl + 1);
984 dev_kfree_skb(skb);
985 } else {
986 int last_desc;
987
988 write_sgl(skb, &q->q, (struct ulptx_sgl *)(cpl + 1), end, 0,
989 addr);
990 skb_orphan(skb);
991
992 last_desc = q->q.pidx + ndesc - 1;
993 if (last_desc >= q->q.size)
994 last_desc -= q->q.size;
995 q->q.sdesc[last_desc].skb = skb;
996 q->q.sdesc[last_desc].sgl = (struct ulptx_sgl *)(cpl + 1);
997 }
998
999 txq_advance(&q->q, ndesc);
1000
1001 ring_tx_db(adap, &q->q, ndesc);
1002 return NETDEV_TX_OK;
1003}
1004
1005/**
1006 * reclaim_completed_tx_imm - reclaim completed control-queue Tx descs
1007 * @q: the SGE control Tx queue
1008 *
1009 * This is a variant of reclaim_completed_tx() that is used for Tx queues
1010 * that send only immediate data (presently just the control queues) and
1011 * thus do not have any sk_buffs to release.
1012 */
1013static inline void reclaim_completed_tx_imm(struct sge_txq *q)
1014{
1015 int hw_cidx = ntohs(q->stat->cidx);
1016 int reclaim = hw_cidx - q->cidx;
1017
1018 if (reclaim < 0)
1019 reclaim += q->size;
1020
1021 q->in_use -= reclaim;
1022 q->cidx = hw_cidx;
1023}
1024
1025/**
1026 * is_imm - check whether a packet can be sent as immediate data
1027 * @skb: the packet
1028 *
1029 * Returns true if a packet can be sent as a WR with immediate data.
1030 */
1031static inline int is_imm(const struct sk_buff *skb)
1032{
1033 return skb->len <= MAX_CTRL_WR_LEN;
1034}
1035
1036/**
1037 * ctrlq_check_stop - check if a control queue is full and should stop
1038 * @q: the queue
1039 * @wr: most recent WR written to the queue
1040 *
1041 * Check if a control queue has become full and should be stopped.
1042 * We clean up control queue descriptors very lazily, only when we are out.
1043 * If the queue is still full after reclaiming any completed descriptors
1044 * we suspend it and have the last WR wake it up.
1045 */
1046static void ctrlq_check_stop(struct sge_ctrl_txq *q, struct fw_wr_hdr *wr)
1047{
1048 reclaim_completed_tx_imm(&q->q);
1049 if (unlikely(txq_avail(&q->q) < TXQ_STOP_THRES)) {
1050 wr->lo |= htonl(FW_WR_EQUEQ | FW_WR_EQUIQ);
1051 q->q.stops++;
1052 q->full = 1;
1053 }
1054}
1055
1056/**
1057 * ctrl_xmit - send a packet through an SGE control Tx queue
1058 * @q: the control queue
1059 * @skb: the packet
1060 *
1061 * Send a packet through an SGE control Tx queue. Packets sent through
1062 * a control queue must fit entirely as immediate data.
1063 */
1064static int ctrl_xmit(struct sge_ctrl_txq *q, struct sk_buff *skb)
1065{
1066 unsigned int ndesc;
1067 struct fw_wr_hdr *wr;
1068
1069 if (unlikely(!is_imm(skb))) {
1070 WARN_ON(1);
1071 dev_kfree_skb(skb);
1072 return NET_XMIT_DROP;
1073 }
1074
1075 ndesc = DIV_ROUND_UP(skb->len, sizeof(struct tx_desc));
1076 spin_lock(&q->sendq.lock);
1077
1078 if (unlikely(q->full)) {
1079 skb->priority = ndesc; /* save for restart */
1080 __skb_queue_tail(&q->sendq, skb);
1081 spin_unlock(&q->sendq.lock);
1082 return NET_XMIT_CN;
1083 }
1084
1085 wr = (struct fw_wr_hdr *)&q->q.desc[q->q.pidx];
1086 inline_tx_skb(skb, &q->q, wr);
1087
1088 txq_advance(&q->q, ndesc);
1089 if (unlikely(txq_avail(&q->q) < TXQ_STOP_THRES))
1090 ctrlq_check_stop(q, wr);
1091
1092 ring_tx_db(q->adap, &q->q, ndesc);
1093 spin_unlock(&q->sendq.lock);
1094
1095 kfree_skb(skb);
1096 return NET_XMIT_SUCCESS;
1097}
1098
1099/**
1100 * restart_ctrlq - restart a suspended control queue
1101 * @data: the control queue to restart
1102 *
1103 * Resumes transmission on a suspended Tx control queue.
1104 */
1105static void restart_ctrlq(unsigned long data)
1106{
1107 struct sk_buff *skb;
1108 unsigned int written = 0;
1109 struct sge_ctrl_txq *q = (struct sge_ctrl_txq *)data;
1110
1111 spin_lock(&q->sendq.lock);
1112 reclaim_completed_tx_imm(&q->q);
1113 BUG_ON(txq_avail(&q->q) < TXQ_STOP_THRES); /* q should be empty */
1114
1115 while ((skb = __skb_dequeue(&q->sendq)) != NULL) {
1116 struct fw_wr_hdr *wr;
1117 unsigned int ndesc = skb->priority; /* previously saved */
1118
1119 /*
1120 * Write descriptors and free skbs outside the lock to limit
1121 * wait times. q->full is still set so new skbs will be queued.
1122 */
1123 spin_unlock(&q->sendq.lock);
1124
1125 wr = (struct fw_wr_hdr *)&q->q.desc[q->q.pidx];
1126 inline_tx_skb(skb, &q->q, wr);
1127 kfree_skb(skb);
1128
1129 written += ndesc;
1130 txq_advance(&q->q, ndesc);
1131 if (unlikely(txq_avail(&q->q) < TXQ_STOP_THRES)) {
1132 unsigned long old = q->q.stops;
1133
1134 ctrlq_check_stop(q, wr);
1135 if (q->q.stops != old) { /* suspended anew */
1136 spin_lock(&q->sendq.lock);
1137 goto ringdb;
1138 }
1139 }
1140 if (written > 16) {
1141 ring_tx_db(q->adap, &q->q, written);
1142 written = 0;
1143 }
1144 spin_lock(&q->sendq.lock);
1145 }
1146 q->full = 0;
1147ringdb: if (written)
1148 ring_tx_db(q->adap, &q->q, written);
1149 spin_unlock(&q->sendq.lock);
1150}
1151
1152/**
1153 * t4_mgmt_tx - send a management message
1154 * @adap: the adapter
1155 * @skb: the packet containing the management message
1156 *
1157 * Send a management message through control queue 0.
1158 */
1159int t4_mgmt_tx(struct adapter *adap, struct sk_buff *skb)
1160{
1161 int ret;
1162
1163 local_bh_disable();
1164 ret = ctrl_xmit(&adap->sge.ctrlq[0], skb);
1165 local_bh_enable();
1166 return ret;
1167}
1168
1169/**
1170 * is_ofld_imm - check whether a packet can be sent as immediate data
1171 * @skb: the packet
1172 *
1173 * Returns true if a packet can be sent as an offload WR with immediate
1174 * data. We currently use the same limit as for Ethernet packets.
1175 */
1176static inline int is_ofld_imm(const struct sk_buff *skb)
1177{
1178 return skb->len <= MAX_IMM_TX_PKT_LEN;
1179}
1180
1181/**
1182 * calc_tx_flits_ofld - calculate # of flits for an offload packet
1183 * @skb: the packet
1184 *
1185 * Returns the number of flits needed for the given offload packet.
1186 * These packets are already fully constructed and no additional headers
1187 * will be added.
1188 */
1189static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
1190{
1191 unsigned int flits, cnt;
1192
1193 if (is_ofld_imm(skb))
1194 return DIV_ROUND_UP(skb->len, 8);
1195
1196 flits = skb_transport_offset(skb) / 8U; /* headers */
1197 cnt = skb_shinfo(skb)->nr_frags;
1198 if (skb->tail != skb->transport_header)
1199 cnt++;
1200 return flits + sgl_len(cnt);
1201}
1202
1203/**
1204 * txq_stop_maperr - stop a Tx queue due to I/O MMU exhaustion
1205 * @adap: the adapter
1206 * @q: the queue to stop
1207 *
1208 * Mark a Tx queue stopped due to I/O MMU exhaustion and resulting
1209 * inability to map packets. A periodic timer attempts to restart
1210 * queues so marked.
1211 */
1212static void txq_stop_maperr(struct sge_ofld_txq *q)
1213{
1214 q->mapping_err++;
1215 q->q.stops++;
1216 set_bit(q->q.cntxt_id, q->adap->sge.txq_maperr);
1217}
1218
1219/**
1220 * ofldtxq_stop - stop an offload Tx queue that has become full
1221 * @q: the queue to stop
1222 * @skb: the packet causing the queue to become full
1223 *
1224 * Stops an offload Tx queue that has become full and modifies the packet
1225 * being written to request a wakeup.
1226 */
1227static void ofldtxq_stop(struct sge_ofld_txq *q, struct sk_buff *skb)
1228{
1229 struct fw_wr_hdr *wr = (struct fw_wr_hdr *)skb->data;
1230
1231 wr->lo |= htonl(FW_WR_EQUEQ | FW_WR_EQUIQ);
1232 q->q.stops++;
1233 q->full = 1;
1234}
1235
1236/**
1237 * service_ofldq - restart a suspended offload queue
1238 * @q: the offload queue
1239 *
1240 * Services an offload Tx queue by moving packets from its packet queue
1241 * to the HW Tx ring. The function starts and ends with the queue locked.
1242 */
1243static void service_ofldq(struct sge_ofld_txq *q)
1244{
1245 u64 *pos;
1246 int credits;
1247 struct sk_buff *skb;
1248 unsigned int written = 0;
1249 unsigned int flits, ndesc;
1250
1251 while ((skb = skb_peek(&q->sendq)) != NULL && !q->full) {
1252 /*
1253 * We drop the lock but leave skb on sendq, thus retaining
1254 * exclusive access to the state of the queue.
1255 */
1256 spin_unlock(&q->sendq.lock);
1257
1258 reclaim_completed_tx(q->adap, &q->q, false);
1259
1260 flits = skb->priority; /* previously saved */
1261 ndesc = flits_to_desc(flits);
1262 credits = txq_avail(&q->q) - ndesc;
1263 BUG_ON(credits < 0);
1264 if (unlikely(credits < TXQ_STOP_THRES))
1265 ofldtxq_stop(q, skb);
1266
1267 pos = (u64 *)&q->q.desc[q->q.pidx];
1268 if (is_ofld_imm(skb))
1269 inline_tx_skb(skb, &q->q, pos);
1270 else if (map_skb(q->adap->pdev_dev, skb,
1271 (dma_addr_t *)skb->head)) {
1272 txq_stop_maperr(q);
1273 spin_lock(&q->sendq.lock);
1274 break;
1275 } else {
1276 int last_desc, hdr_len = skb_transport_offset(skb);
1277
1278 memcpy(pos, skb->data, hdr_len);
1279 write_sgl(skb, &q->q, (void *)pos + hdr_len,
1280 pos + flits, hdr_len,
1281 (dma_addr_t *)skb->head);
1282#ifdef CONFIG_NEED_DMA_MAP_STATE
1283 skb->dev = q->adap->port[0];
1284 skb->destructor = deferred_unmap_destructor;
1285#endif
1286 last_desc = q->q.pidx + ndesc - 1;
1287 if (last_desc >= q->q.size)
1288 last_desc -= q->q.size;
1289 q->q.sdesc[last_desc].skb = skb;
1290 }
1291
1292 txq_advance(&q->q, ndesc);
1293 written += ndesc;
1294 if (unlikely(written > 32)) {
1295 ring_tx_db(q->adap, &q->q, written);
1296 written = 0;
1297 }
1298
1299 spin_lock(&q->sendq.lock);
1300 __skb_unlink(skb, &q->sendq);
1301 if (is_ofld_imm(skb))
1302 kfree_skb(skb);
1303 }
1304 if (likely(written))
1305 ring_tx_db(q->adap, &q->q, written);
1306}
1307
1308/**
1309 * ofld_xmit - send a packet through an offload queue
1310 * @q: the Tx offload queue
1311 * @skb: the packet
1312 *
1313 * Send an offload packet through an SGE offload queue.
1314 */
1315static int ofld_xmit(struct sge_ofld_txq *q, struct sk_buff *skb)
1316{
1317 skb->priority = calc_tx_flits_ofld(skb); /* save for restart */
1318 spin_lock(&q->sendq.lock);
1319 __skb_queue_tail(&q->sendq, skb);
1320 if (q->sendq.qlen == 1)
1321 service_ofldq(q);
1322 spin_unlock(&q->sendq.lock);
1323 return NET_XMIT_SUCCESS;
1324}
1325
1326/**
1327 * restart_ofldq - restart a suspended offload queue
1328 * @data: the offload queue to restart
1329 *
1330 * Resumes transmission on a suspended Tx offload queue.
1331 */
1332static void restart_ofldq(unsigned long data)
1333{
1334 struct sge_ofld_txq *q = (struct sge_ofld_txq *)data;
1335
1336 spin_lock(&q->sendq.lock);
1337 q->full = 0; /* the queue actually is completely empty now */
1338 service_ofldq(q);
1339 spin_unlock(&q->sendq.lock);
1340}
1341
1342/**
1343 * skb_txq - return the Tx queue an offload packet should use
1344 * @skb: the packet
1345 *
1346 * Returns the Tx queue an offload packet should use as indicated by bits
1347 * 1-15 in the packet's queue_mapping.
1348 */
1349static inline unsigned int skb_txq(const struct sk_buff *skb)
1350{
1351 return skb->queue_mapping >> 1;
1352}
1353
1354/**
1355 * is_ctrl_pkt - return whether an offload packet is a control packet
1356 * @skb: the packet
1357 *
1358 * Returns whether an offload packet should use an OFLD or a CTRL
1359 * Tx queue as indicated by bit 0 in the packet's queue_mapping.
1360 */
1361static inline unsigned int is_ctrl_pkt(const struct sk_buff *skb)
1362{
1363 return skb->queue_mapping & 1;
1364}
1365
1366static inline int ofld_send(struct adapter *adap, struct sk_buff *skb)
1367{
1368 unsigned int idx = skb_txq(skb);
1369
1370 if (unlikely(is_ctrl_pkt(skb)))
1371 return ctrl_xmit(&adap->sge.ctrlq[idx], skb);
1372 return ofld_xmit(&adap->sge.ofldtxq[idx], skb);
1373}
1374
1375/**
1376 * t4_ofld_send - send an offload packet
1377 * @adap: the adapter
1378 * @skb: the packet
1379 *
1380 * Sends an offload packet. We use the packet queue_mapping to select the
1381 * appropriate Tx queue as follows: bit 0 indicates whether the packet
1382 * should be sent as regular or control, bits 1-15 select the queue.
1383 */
1384int t4_ofld_send(struct adapter *adap, struct sk_buff *skb)
1385{
1386 int ret;
1387
1388 local_bh_disable();
1389 ret = ofld_send(adap, skb);
1390 local_bh_enable();
1391 return ret;
1392}
1393
1394/**
1395 * cxgb4_ofld_send - send an offload packet
1396 * @dev: the net device
1397 * @skb: the packet
1398 *
1399 * Sends an offload packet. This is an exported version of @t4_ofld_send,
1400 * intended for ULDs.
1401 */
1402int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb)
1403{
1404 return t4_ofld_send(netdev2adap(dev), skb);
1405}
1406EXPORT_SYMBOL(cxgb4_ofld_send);
1407
1408static inline void copy_frags(struct skb_shared_info *ssi,
1409 const struct pkt_gl *gl, unsigned int offset)
1410{
1411 unsigned int n;
1412
1413 /* usually there's just one frag */
1414 ssi->frags[0].page = gl->frags[0].page;
1415 ssi->frags[0].page_offset = gl->frags[0].page_offset + offset;
1416 ssi->frags[0].size = gl->frags[0].size - offset;
1417 ssi->nr_frags = gl->nfrags;
1418 n = gl->nfrags - 1;
1419 if (n)
1420 memcpy(&ssi->frags[1], &gl->frags[1], n * sizeof(skb_frag_t));
1421
1422 /* get a reference to the last page, we don't own it */
1423 get_page(gl->frags[n].page);
1424}
1425
1426/**
1427 * cxgb4_pktgl_to_skb - build an sk_buff from a packet gather list
1428 * @gl: the gather list
1429 * @skb_len: size of sk_buff main body if it carries fragments
1430 * @pull_len: amount of data to move to the sk_buff's main body
1431 *
1432 * Builds an sk_buff from the given packet gather list. Returns the
1433 * sk_buff or %NULL if sk_buff allocation failed.
1434 */
1435struct sk_buff *cxgb4_pktgl_to_skb(const struct pkt_gl *gl,
1436 unsigned int skb_len, unsigned int pull_len)
1437{
1438 struct sk_buff *skb;
1439
1440 /*
1441 * Below we rely on RX_COPY_THRES being less than the smallest Rx buffer
1442 * size, which is expected since buffers are at least PAGE_SIZEd.
1443 * In this case packets up to RX_COPY_THRES have only one fragment.
1444 */
1445 if (gl->tot_len <= RX_COPY_THRES) {
1446 skb = dev_alloc_skb(gl->tot_len);
1447 if (unlikely(!skb))
1448 goto out;
1449 __skb_put(skb, gl->tot_len);
1450 skb_copy_to_linear_data(skb, gl->va, gl->tot_len);
1451 } else {
1452 skb = dev_alloc_skb(skb_len);
1453 if (unlikely(!skb))
1454 goto out;
1455 __skb_put(skb, pull_len);
1456 skb_copy_to_linear_data(skb, gl->va, pull_len);
1457
1458 copy_frags(skb_shinfo(skb), gl, pull_len);
1459 skb->len = gl->tot_len;
1460 skb->data_len = skb->len - pull_len;
1461 skb->truesize += skb->data_len;
1462 }
1463out: return skb;
1464}
1465EXPORT_SYMBOL(cxgb4_pktgl_to_skb);
1466
1467/**
1468 * t4_pktgl_free - free a packet gather list
1469 * @gl: the gather list
1470 *
1471 * Releases the pages of a packet gather list. We do not own the last
1472 * page on the list and do not free it.
1473 */
1474void t4_pktgl_free(const struct pkt_gl *gl)
1475{
1476 int n;
1477 const skb_frag_t *p;
1478
1479 for (p = gl->frags, n = gl->nfrags - 1; n--; p++)
1480 put_page(p->page);
1481}
1482
1483/*
1484 * Process an MPS trace packet. Give it an unused protocol number so it won't
1485 * be delivered to anyone and send it to the stack for capture.
1486 */
1487static noinline int handle_trace_pkt(struct adapter *adap,
1488 const struct pkt_gl *gl)
1489{
1490 struct sk_buff *skb;
1491 struct cpl_trace_pkt *p;
1492
1493 skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
1494 if (unlikely(!skb)) {
1495 t4_pktgl_free(gl);
1496 return 0;
1497 }
1498
1499 p = (struct cpl_trace_pkt *)skb->data;
1500 __skb_pull(skb, sizeof(*p));
1501 skb_reset_mac_header(skb);
1502 skb->protocol = htons(0xffff);
1503 skb->dev = adap->port[0];
1504 netif_receive_skb(skb);
1505 return 0;
1506}
1507
1508static void do_gro(struct sge_eth_rxq *rxq, const struct pkt_gl *gl,
1509 const struct cpl_rx_pkt *pkt)
1510{
1511 int ret;
1512 struct sk_buff *skb;
1513
1514 skb = napi_get_frags(&rxq->rspq.napi);
1515 if (unlikely(!skb)) {
1516 t4_pktgl_free(gl);
1517 rxq->stats.rx_drops++;
1518 return;
1519 }
1520
1521 copy_frags(skb_shinfo(skb), gl, RX_PKT_PAD);
1522 skb->len = gl->tot_len - RX_PKT_PAD;
1523 skb->data_len = skb->len;
1524 skb->truesize += skb->data_len;
1525 skb->ip_summed = CHECKSUM_UNNECESSARY;
1526 skb_record_rx_queue(skb, rxq->rspq.idx);
1527
1528 if (unlikely(pkt->vlan_ex)) {
1529 struct port_info *pi = netdev_priv(rxq->rspq.netdev);
1530 struct vlan_group *grp = pi->vlan_grp;
1531
1532 rxq->stats.vlan_ex++;
1533 if (likely(grp)) {
1534 ret = vlan_gro_frags(&rxq->rspq.napi, grp,
1535 ntohs(pkt->vlan));
1536 goto stats;
1537 }
1538 }
1539 ret = napi_gro_frags(&rxq->rspq.napi);
1540stats: if (ret == GRO_HELD)
1541 rxq->stats.lro_pkts++;
1542 else if (ret == GRO_MERGED || ret == GRO_MERGED_FREE)
1543 rxq->stats.lro_merged++;
1544 rxq->stats.pkts++;
1545 rxq->stats.rx_cso++;
1546}
1547
1548/**
1549 * t4_ethrx_handler - process an ingress ethernet packet
1550 * @q: the response queue that received the packet
1551 * @rsp: the response queue descriptor holding the RX_PKT message
1552 * @si: the gather list of packet fragments
1553 *
1554 * Process an ingress ethernet packet and deliver it to the stack.
1555 */
1556int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
1557 const struct pkt_gl *si)
1558{
1559 bool csum_ok;
1560 struct sk_buff *skb;
1561 struct port_info *pi;
1562 const struct cpl_rx_pkt *pkt;
1563 struct sge_eth_rxq *rxq = container_of(q, struct sge_eth_rxq, rspq);
1564
1565 if (unlikely(*(u8 *)rsp == CPL_TRACE_PKT))
1566 return handle_trace_pkt(q->adap, si);
1567
1568 pkt = (void *)&rsp[1];
1569 csum_ok = pkt->csum_calc && !pkt->err_vec;
1570 if ((pkt->l2info & htonl(RXF_TCP)) &&
1571 (q->netdev->features & NETIF_F_GRO) && csum_ok && !pkt->ip_frag) {
1572 do_gro(rxq, si, pkt);
1573 return 0;
1574 }
1575
1576 skb = cxgb4_pktgl_to_skb(si, RX_PKT_SKB_LEN, RX_PULL_LEN);
1577 if (unlikely(!skb)) {
1578 t4_pktgl_free(si);
1579 rxq->stats.rx_drops++;
1580 return 0;
1581 }
1582
1583 __skb_pull(skb, RX_PKT_PAD); /* remove ethernet header padding */
1584 skb->protocol = eth_type_trans(skb, q->netdev);
1585 skb_record_rx_queue(skb, q->idx);
1586 pi = netdev_priv(skb->dev);
1587 rxq->stats.pkts++;
1588
1589 if (csum_ok && (pi->rx_offload & RX_CSO) &&
1590 (pkt->l2info & htonl(RXF_UDP | RXF_TCP))) {
1591 if (!pkt->ip_frag)
1592 skb->ip_summed = CHECKSUM_UNNECESSARY;
1593 else {
1594 __sum16 c = (__force __sum16)pkt->csum;
1595 skb->csum = csum_unfold(c);
1596 skb->ip_summed = CHECKSUM_COMPLETE;
1597 }
1598 rxq->stats.rx_cso++;
1599 } else
1600 skb->ip_summed = CHECKSUM_NONE;
1601
1602 if (unlikely(pkt->vlan_ex)) {
1603 struct vlan_group *grp = pi->vlan_grp;
1604
1605 rxq->stats.vlan_ex++;
1606 if (likely(grp))
1607 vlan_hwaccel_receive_skb(skb, grp, ntohs(pkt->vlan));
1608 else
1609 dev_kfree_skb_any(skb);
1610 } else
1611 netif_receive_skb(skb);
1612
1613 return 0;
1614}
1615
1616/**
1617 * restore_rx_bufs - put back a packet's Rx buffers
1618 * @si: the packet gather list
1619 * @q: the SGE free list
1620 * @frags: number of FL buffers to restore
1621 *
1622 * Puts back on an FL the Rx buffers associated with @si. The buffers
1623 * have already been unmapped and are left unmapped, we mark them so to
1624 * prevent further unmapping attempts.
1625 *
1626 * This function undoes a series of @unmap_rx_buf calls when we find out
1627 * that the current packet can't be processed right away afterall and we
1628 * need to come back to it later. This is a very rare event and there's
1629 * no effort to make this particularly efficient.
1630 */
1631static void restore_rx_bufs(const struct pkt_gl *si, struct sge_fl *q,
1632 int frags)
1633{
1634 struct rx_sw_desc *d;
1635
1636 while (frags--) {
1637 if (q->cidx == 0)
1638 q->cidx = q->size - 1;
1639 else
1640 q->cidx--;
1641 d = &q->sdesc[q->cidx];
1642 d->page = si->frags[frags].page;
1643 d->dma_addr |= RX_UNMAPPED_BUF;
1644 q->avail++;
1645 }
1646}
1647
1648/**
1649 * is_new_response - check if a response is newly written
1650 * @r: the response descriptor
1651 * @q: the response queue
1652 *
1653 * Returns true if a response descriptor contains a yet unprocessed
1654 * response.
1655 */
1656static inline bool is_new_response(const struct rsp_ctrl *r,
1657 const struct sge_rspq *q)
1658{
1659 return RSPD_GEN(r->type_gen) == q->gen;
1660}
1661
1662/**
1663 * rspq_next - advance to the next entry in a response queue
1664 * @q: the queue
1665 *
1666 * Updates the state of a response queue to advance it to the next entry.
1667 */
1668static inline void rspq_next(struct sge_rspq *q)
1669{
1670 q->cur_desc = (void *)q->cur_desc + q->iqe_len;
1671 if (unlikely(++q->cidx == q->size)) {
1672 q->cidx = 0;
1673 q->gen ^= 1;
1674 q->cur_desc = q->desc;
1675 }
1676}
1677
1678/**
1679 * process_responses - process responses from an SGE response queue
1680 * @q: the ingress queue to process
1681 * @budget: how many responses can be processed in this round
1682 *
1683 * Process responses from an SGE response queue up to the supplied budget.
1684 * Responses include received packets as well as control messages from FW
1685 * or HW.
1686 *
1687 * Additionally choose the interrupt holdoff time for the next interrupt
1688 * on this queue. If the system is under memory shortage use a fairly
1689 * long delay to help recovery.
1690 */
1691static int process_responses(struct sge_rspq *q, int budget)
1692{
1693 int ret, rsp_type;
1694 int budget_left = budget;
1695 const struct rsp_ctrl *rc;
1696 struct sge_eth_rxq *rxq = container_of(q, struct sge_eth_rxq, rspq);
1697
1698 while (likely(budget_left)) {
1699 rc = (void *)q->cur_desc + (q->iqe_len - sizeof(*rc));
1700 if (!is_new_response(rc, q))
1701 break;
1702
1703 rmb();
1704 rsp_type = RSPD_TYPE(rc->type_gen);
1705 if (likely(rsp_type == RSP_TYPE_FLBUF)) {
1706 skb_frag_t *fp;
1707 struct pkt_gl si;
1708 const struct rx_sw_desc *rsd;
1709 u32 len = ntohl(rc->pldbuflen_qid), bufsz, frags;
1710
1711 if (len & RSPD_NEWBUF) {
1712 if (likely(q->offset > 0)) {
1713 free_rx_bufs(q->adap, &rxq->fl, 1);
1714 q->offset = 0;
1715 }
1716 len &= RSPD_LEN;
1717 }
1718 si.tot_len = len;
1719
1720 /* gather packet fragments */
1721 for (frags = 0, fp = si.frags; ; frags++, fp++) {
1722 rsd = &rxq->fl.sdesc[rxq->fl.cidx];
1723 bufsz = get_buf_size(rsd);
1724 fp->page = rsd->page;
1725 fp->page_offset = q->offset;
1726 fp->size = min(bufsz, len);
1727 len -= fp->size;
1728 if (!len)
1729 break;
1730 unmap_rx_buf(q->adap, &rxq->fl);
1731 }
1732
1733 /*
1734 * Last buffer remains mapped so explicitly make it
1735 * coherent for CPU access.
1736 */
1737 dma_sync_single_for_cpu(q->adap->pdev_dev,
1738 get_buf_addr(rsd),
1739 fp->size, DMA_FROM_DEVICE);
1740
1741 si.va = page_address(si.frags[0].page) +
1742 si.frags[0].page_offset;
1743 prefetch(si.va);
1744
1745 si.nfrags = frags + 1;
1746 ret = q->handler(q, q->cur_desc, &si);
1747 if (likely(ret == 0))
1748 q->offset += ALIGN(fp->size, FL_ALIGN);
1749 else
1750 restore_rx_bufs(&si, &rxq->fl, frags);
1751 } else if (likely(rsp_type == RSP_TYPE_CPL)) {
1752 ret = q->handler(q, q->cur_desc, NULL);
1753 } else {
1754 ret = q->handler(q, (const __be64 *)rc, CXGB4_MSG_AN);
1755 }
1756
1757 if (unlikely(ret)) {
1758 /* couldn't process descriptor, back off for recovery */
1759 q->next_intr_params = QINTR_TIMER_IDX(NOMEM_TMR_IDX);
1760 break;
1761 }
1762
1763 rspq_next(q);
1764 budget_left--;
1765 }
1766
1767 if (q->offset >= 0 && rxq->fl.size - rxq->fl.avail >= 16)
1768 __refill_fl(q->adap, &rxq->fl);
1769 return budget - budget_left;
1770}
1771
1772/**
1773 * napi_rx_handler - the NAPI handler for Rx processing
1774 * @napi: the napi instance
1775 * @budget: how many packets we can process in this round
1776 *
1777 * Handler for new data events when using NAPI. This does not need any
1778 * locking or protection from interrupts as data interrupts are off at
1779 * this point and other adapter interrupts do not interfere (the latter
1780 * in not a concern at all with MSI-X as non-data interrupts then have
1781 * a separate handler).
1782 */
1783static int napi_rx_handler(struct napi_struct *napi, int budget)
1784{
1785 unsigned int params;
1786 struct sge_rspq *q = container_of(napi, struct sge_rspq, napi);
1787 int work_done = process_responses(q, budget);
1788
1789 if (likely(work_done < budget)) {
1790 napi_complete(napi);
1791 params = q->next_intr_params;
1792 q->next_intr_params = q->intr_params;
1793 } else
1794 params = QINTR_TIMER_IDX(7);
1795
1796 t4_write_reg(q->adap, MYPF_REG(SGE_PF_GTS), CIDXINC(work_done) |
1797 INGRESSQID((u32)q->cntxt_id) | SEINTARM(params));
1798 return work_done;
1799}
1800
1801/*
1802 * The MSI-X interrupt handler for an SGE response queue.
1803 */
1804irqreturn_t t4_sge_intr_msix(int irq, void *cookie)
1805{
1806 struct sge_rspq *q = cookie;
1807
1808 napi_schedule(&q->napi);
1809 return IRQ_HANDLED;
1810}
1811
1812/*
1813 * Process the indirect interrupt entries in the interrupt queue and kick off
1814 * NAPI for each queue that has generated an entry.
1815 */
1816static unsigned int process_intrq(struct adapter *adap)
1817{
1818 unsigned int credits;
1819 const struct rsp_ctrl *rc;
1820 struct sge_rspq *q = &adap->sge.intrq;
1821
1822 spin_lock(&adap->sge.intrq_lock);
1823 for (credits = 0; ; credits++) {
1824 rc = (void *)q->cur_desc + (q->iqe_len - sizeof(*rc));
1825 if (!is_new_response(rc, q))
1826 break;
1827
1828 rmb();
1829 if (RSPD_TYPE(rc->type_gen) == RSP_TYPE_INTR) {
1830 unsigned int qid = ntohl(rc->pldbuflen_qid);
1831
1832 napi_schedule(&adap->sge.ingr_map[qid]->napi);
1833 }
1834
1835 rspq_next(q);
1836 }
1837
1838 t4_write_reg(adap, MYPF_REG(SGE_PF_GTS), CIDXINC(credits) |
1839 INGRESSQID(q->cntxt_id) | SEINTARM(q->intr_params));
1840 spin_unlock(&adap->sge.intrq_lock);
1841 return credits;
1842}
1843
1844/*
1845 * The MSI interrupt handler, which handles data events from SGE response queues
1846 * as well as error and other async events as they all use the same MSI vector.
1847 */
1848static irqreturn_t t4_intr_msi(int irq, void *cookie)
1849{
1850 struct adapter *adap = cookie;
1851
1852 t4_slow_intr_handler(adap);
1853 process_intrq(adap);
1854 return IRQ_HANDLED;
1855}
1856
1857/*
1858 * Interrupt handler for legacy INTx interrupts.
1859 * Handles data events from SGE response queues as well as error and other
1860 * async events as they all use the same interrupt line.
1861 */
1862static irqreturn_t t4_intr_intx(int irq, void *cookie)
1863{
1864 struct adapter *adap = cookie;
1865
1866 t4_write_reg(adap, MYPF_REG(PCIE_PF_CLI), 0);
1867 if (t4_slow_intr_handler(adap) | process_intrq(adap))
1868 return IRQ_HANDLED;
1869 return IRQ_NONE; /* probably shared interrupt */
1870}
1871
1872/**
1873 * t4_intr_handler - select the top-level interrupt handler
1874 * @adap: the adapter
1875 *
1876 * Selects the top-level interrupt handler based on the type of interrupts
1877 * (MSI-X, MSI, or INTx).
1878 */
1879irq_handler_t t4_intr_handler(struct adapter *adap)
1880{
1881 if (adap->flags & USING_MSIX)
1882 return t4_sge_intr_msix;
1883 if (adap->flags & USING_MSI)
1884 return t4_intr_msi;
1885 return t4_intr_intx;
1886}
1887
1888static void sge_rx_timer_cb(unsigned long data)
1889{
1890 unsigned long m;
1891 unsigned int i, cnt[2];
1892 struct adapter *adap = (struct adapter *)data;
1893 struct sge *s = &adap->sge;
1894
1895 for (i = 0; i < ARRAY_SIZE(s->starving_fl); i++)
1896 for (m = s->starving_fl[i]; m; m &= m - 1) {
1897 struct sge_eth_rxq *rxq;
1898 unsigned int id = __ffs(m) + i * BITS_PER_LONG;
1899 struct sge_fl *fl = s->egr_map[id];
1900
1901 clear_bit(id, s->starving_fl);
1902 smp_mb__after_clear_bit();
1903
1904 if (fl_starving(fl)) {
1905 rxq = container_of(fl, struct sge_eth_rxq, fl);
1906 if (napi_reschedule(&rxq->rspq.napi))
1907 fl->starving++;
1908 else
1909 set_bit(id, s->starving_fl);
1910 }
1911 }
1912
1913 t4_write_reg(adap, SGE_DEBUG_INDEX, 13);
1914 cnt[0] = t4_read_reg(adap, SGE_DEBUG_DATA_HIGH);
1915 cnt[1] = t4_read_reg(adap, SGE_DEBUG_DATA_LOW);
1916
1917 for (i = 0; i < 2; i++)
1918 if (cnt[i] >= s->starve_thres) {
1919 if (s->idma_state[i] || cnt[i] == 0xffffffff)
1920 continue;
1921 s->idma_state[i] = 1;
1922 t4_write_reg(adap, SGE_DEBUG_INDEX, 11);
1923 m = t4_read_reg(adap, SGE_DEBUG_DATA_LOW) >> (i * 16);
1924 dev_warn(adap->pdev_dev,
1925 "SGE idma%u starvation detected for "
1926 "queue %lu\n", i, m & 0xffff);
1927 } else if (s->idma_state[i])
1928 s->idma_state[i] = 0;
1929
1930 mod_timer(&s->rx_timer, jiffies + RX_QCHECK_PERIOD);
1931}
1932
1933static void sge_tx_timer_cb(unsigned long data)
1934{
1935 unsigned long m;
1936 unsigned int i, budget;
1937 struct adapter *adap = (struct adapter *)data;
1938 struct sge *s = &adap->sge;
1939
1940 for (i = 0; i < ARRAY_SIZE(s->txq_maperr); i++)
1941 for (m = s->txq_maperr[i]; m; m &= m - 1) {
1942 unsigned long id = __ffs(m) + i * BITS_PER_LONG;
1943 struct sge_ofld_txq *txq = s->egr_map[id];
1944
1945 clear_bit(id, s->txq_maperr);
1946 tasklet_schedule(&txq->qresume_tsk);
1947 }
1948
1949 budget = MAX_TIMER_TX_RECLAIM;
1950 i = s->ethtxq_rover;
1951 do {
1952 struct sge_eth_txq *q = &s->ethtxq[i];
1953
1954 if (q->q.in_use &&
1955 time_after_eq(jiffies, q->txq->trans_start + HZ / 100) &&
1956 __netif_tx_trylock(q->txq)) {
1957 int avail = reclaimable(&q->q);
1958
1959 if (avail) {
1960 if (avail > budget)
1961 avail = budget;
1962
1963 free_tx_desc(adap, &q->q, avail, true);
1964 q->q.in_use -= avail;
1965 budget -= avail;
1966 }
1967 __netif_tx_unlock(q->txq);
1968 }
1969
1970 if (++i >= s->ethqsets)
1971 i = 0;
1972 } while (budget && i != s->ethtxq_rover);
1973 s->ethtxq_rover = i;
1974 mod_timer(&s->tx_timer, jiffies + (budget ? TX_QCHECK_PERIOD : 2));
1975}
1976
1977int t4_sge_alloc_rxq(struct adapter *adap, struct sge_rspq *iq, bool fwevtq,
1978 struct net_device *dev, int intr_idx,
1979 struct sge_fl *fl, rspq_handler_t hnd)
1980{
1981 int ret, flsz = 0;
1982 struct fw_iq_cmd c;
1983 struct port_info *pi = netdev_priv(dev);
1984
1985 /* Size needs to be multiple of 16, including status entry. */
1986 iq->size = roundup(iq->size, 16);
1987
1988 iq->desc = alloc_ring(adap->pdev_dev, iq->size, iq->iqe_len, 0,
1989 &iq->phys_addr, NULL, 0);
1990 if (!iq->desc)
1991 return -ENOMEM;
1992
1993 memset(&c, 0, sizeof(c));
1994 c.op_to_vfn = htonl(FW_CMD_OP(FW_IQ_CMD) | FW_CMD_REQUEST |
1995 FW_CMD_WRITE | FW_CMD_EXEC |
1996 FW_IQ_CMD_PFN(0) | FW_IQ_CMD_VFN(0));
1997 c.alloc_to_len16 = htonl(FW_IQ_CMD_ALLOC | FW_IQ_CMD_IQSTART(1) |
1998 FW_LEN16(c));
1999 c.type_to_iqandstindex = htonl(FW_IQ_CMD_TYPE(FW_IQ_TYPE_FL_INT_CAP) |
2000 FW_IQ_CMD_IQASYNCH(fwevtq) | FW_IQ_CMD_VIID(pi->viid) |
2001 FW_IQ_CMD_IQANDST(intr_idx < 0) | FW_IQ_CMD_IQANUD(1) |
2002 FW_IQ_CMD_IQANDSTINDEX(intr_idx >= 0 ? intr_idx :
2003 -intr_idx - 1));
2004 c.iqdroprss_to_iqesize = htons(FW_IQ_CMD_IQPCIECH(pi->tx_chan) |
2005 FW_IQ_CMD_IQGTSMODE |
2006 FW_IQ_CMD_IQINTCNTTHRESH(iq->pktcnt_idx) |
2007 FW_IQ_CMD_IQESIZE(ilog2(iq->iqe_len) - 4));
2008 c.iqsize = htons(iq->size);
2009 c.iqaddr = cpu_to_be64(iq->phys_addr);
2010
2011 if (fl) {
2012 fl->size = roundup(fl->size, 8);
2013 fl->desc = alloc_ring(adap->pdev_dev, fl->size, sizeof(__be64),
2014 sizeof(struct rx_sw_desc), &fl->addr,
2015 &fl->sdesc, STAT_LEN);
2016 if (!fl->desc)
2017 goto fl_nomem;
2018
2019 flsz = fl->size / 8 + STAT_LEN / sizeof(struct tx_desc);
2020 c.iqns_to_fl0congen = htonl(FW_IQ_CMD_FL0PACKEN |
2021 FW_IQ_CMD_FL0PADEN);
2022 c.fl0dcaen_to_fl0cidxfthresh = htons(FW_IQ_CMD_FL0FBMIN(2) |
2023 FW_IQ_CMD_FL0FBMAX(3));
2024 c.fl0size = htons(flsz);
2025 c.fl0addr = cpu_to_be64(fl->addr);
2026 }
2027
2028 ret = t4_wr_mbox(adap, 0, &c, sizeof(c), &c);
2029 if (ret)
2030 goto err;
2031
2032 netif_napi_add(dev, &iq->napi, napi_rx_handler, 64);
2033 iq->cur_desc = iq->desc;
2034 iq->cidx = 0;
2035 iq->gen = 1;
2036 iq->next_intr_params = iq->intr_params;
2037 iq->cntxt_id = ntohs(c.iqid);
2038 iq->abs_id = ntohs(c.physiqid);
2039 iq->size--; /* subtract status entry */
2040 iq->adap = adap;
2041 iq->netdev = dev;
2042 iq->handler = hnd;
2043
2044 /* set offset to -1 to distinguish ingress queues without FL */
2045 iq->offset = fl ? 0 : -1;
2046
2047 adap->sge.ingr_map[iq->cntxt_id] = iq;
2048
2049 if (fl) {
2050 fl->cntxt_id = htons(c.fl0id);
2051 fl->avail = fl->pend_cred = 0;
2052 fl->pidx = fl->cidx = 0;
2053 fl->alloc_failed = fl->large_alloc_failed = fl->starving = 0;
2054 adap->sge.egr_map[fl->cntxt_id] = fl;
2055 refill_fl(adap, fl, fl_cap(fl), GFP_KERNEL);
2056 }
2057 return 0;
2058
2059fl_nomem:
2060 ret = -ENOMEM;
2061err:
2062 if (iq->desc) {
2063 dma_free_coherent(adap->pdev_dev, iq->size * iq->iqe_len,
2064 iq->desc, iq->phys_addr);
2065 iq->desc = NULL;
2066 }
2067 if (fl && fl->desc) {
2068 kfree(fl->sdesc);
2069 fl->sdesc = NULL;
2070 dma_free_coherent(adap->pdev_dev, flsz * sizeof(struct tx_desc),
2071 fl->desc, fl->addr);
2072 fl->desc = NULL;
2073 }
2074 return ret;
2075}
2076
2077static void init_txq(struct adapter *adap, struct sge_txq *q, unsigned int id)
2078{
2079 q->in_use = 0;
2080 q->cidx = q->pidx = 0;
2081 q->stops = q->restarts = 0;
2082 q->stat = (void *)&q->desc[q->size];
2083 q->cntxt_id = id;
2084 adap->sge.egr_map[id] = q;
2085}
2086
2087int t4_sge_alloc_eth_txq(struct adapter *adap, struct sge_eth_txq *txq,
2088 struct net_device *dev, struct netdev_queue *netdevq,
2089 unsigned int iqid)
2090{
2091 int ret, nentries;
2092 struct fw_eq_eth_cmd c;
2093 struct port_info *pi = netdev_priv(dev);
2094
2095 /* Add status entries */
2096 nentries = txq->q.size + STAT_LEN / sizeof(struct tx_desc);
2097
2098 txq->q.desc = alloc_ring(adap->pdev_dev, txq->q.size,
2099 sizeof(struct tx_desc), sizeof(struct tx_sw_desc),
2100 &txq->q.phys_addr, &txq->q.sdesc, STAT_LEN);
2101 if (!txq->q.desc)
2102 return -ENOMEM;
2103
2104 memset(&c, 0, sizeof(c));
2105 c.op_to_vfn = htonl(FW_CMD_OP(FW_EQ_ETH_CMD) | FW_CMD_REQUEST |
2106 FW_CMD_WRITE | FW_CMD_EXEC |
2107 FW_EQ_ETH_CMD_PFN(0) | FW_EQ_ETH_CMD_VFN(0));
2108 c.alloc_to_len16 = htonl(FW_EQ_ETH_CMD_ALLOC |
2109 FW_EQ_ETH_CMD_EQSTART | FW_LEN16(c));
2110 c.viid_pkd = htonl(FW_EQ_ETH_CMD_VIID(pi->viid));
2111 c.fetchszm_to_iqid = htonl(FW_EQ_ETH_CMD_HOSTFCMODE(2) |
2112 FW_EQ_ETH_CMD_PCIECHN(pi->tx_chan) |
2113 FW_EQ_ETH_CMD_IQID(iqid));
2114 c.dcaen_to_eqsize = htonl(FW_EQ_ETH_CMD_FBMIN(2) |
2115 FW_EQ_ETH_CMD_FBMAX(3) |
2116 FW_EQ_ETH_CMD_CIDXFTHRESH(5) |
2117 FW_EQ_ETH_CMD_EQSIZE(nentries));
2118 c.eqaddr = cpu_to_be64(txq->q.phys_addr);
2119
2120 ret = t4_wr_mbox(adap, 0, &c, sizeof(c), &c);
2121 if (ret) {
2122 kfree(txq->q.sdesc);
2123 txq->q.sdesc = NULL;
2124 dma_free_coherent(adap->pdev_dev,
2125 nentries * sizeof(struct tx_desc),
2126 txq->q.desc, txq->q.phys_addr);
2127 txq->q.desc = NULL;
2128 return ret;
2129 }
2130
2131 init_txq(adap, &txq->q, FW_EQ_ETH_CMD_EQID_GET(ntohl(c.eqid_pkd)));
2132 txq->txq = netdevq;
2133 txq->tso = txq->tx_cso = txq->vlan_ins = 0;
2134 txq->mapping_err = 0;
2135 return 0;
2136}
2137
2138int t4_sge_alloc_ctrl_txq(struct adapter *adap, struct sge_ctrl_txq *txq,
2139 struct net_device *dev, unsigned int iqid,
2140 unsigned int cmplqid)
2141{
2142 int ret, nentries;
2143 struct fw_eq_ctrl_cmd c;
2144 struct port_info *pi = netdev_priv(dev);
2145
2146 /* Add status entries */
2147 nentries = txq->q.size + STAT_LEN / sizeof(struct tx_desc);
2148
2149 txq->q.desc = alloc_ring(adap->pdev_dev, nentries,
2150 sizeof(struct tx_desc), 0, &txq->q.phys_addr,
2151 NULL, 0);
2152 if (!txq->q.desc)
2153 return -ENOMEM;
2154
2155 c.op_to_vfn = htonl(FW_CMD_OP(FW_EQ_CTRL_CMD) | FW_CMD_REQUEST |
2156 FW_CMD_WRITE | FW_CMD_EXEC |
2157 FW_EQ_CTRL_CMD_PFN(0) | FW_EQ_CTRL_CMD_VFN(0));
2158 c.alloc_to_len16 = htonl(FW_EQ_CTRL_CMD_ALLOC |
2159 FW_EQ_CTRL_CMD_EQSTART | FW_LEN16(c));
2160 c.cmpliqid_eqid = htonl(FW_EQ_CTRL_CMD_CMPLIQID(cmplqid));
2161 c.physeqid_pkd = htonl(0);
2162 c.fetchszm_to_iqid = htonl(FW_EQ_CTRL_CMD_HOSTFCMODE(2) |
2163 FW_EQ_CTRL_CMD_PCIECHN(pi->tx_chan) |
2164 FW_EQ_CTRL_CMD_IQID(iqid));
2165 c.dcaen_to_eqsize = htonl(FW_EQ_CTRL_CMD_FBMIN(2) |
2166 FW_EQ_CTRL_CMD_FBMAX(3) |
2167 FW_EQ_CTRL_CMD_CIDXFTHRESH(5) |
2168 FW_EQ_CTRL_CMD_EQSIZE(nentries));
2169 c.eqaddr = cpu_to_be64(txq->q.phys_addr);
2170
2171 ret = t4_wr_mbox(adap, 0, &c, sizeof(c), &c);
2172 if (ret) {
2173 dma_free_coherent(adap->pdev_dev,
2174 nentries * sizeof(struct tx_desc),
2175 txq->q.desc, txq->q.phys_addr);
2176 txq->q.desc = NULL;
2177 return ret;
2178 }
2179
2180 init_txq(adap, &txq->q, FW_EQ_CTRL_CMD_EQID_GET(ntohl(c.cmpliqid_eqid)));
2181 txq->adap = adap;
2182 skb_queue_head_init(&txq->sendq);
2183 tasklet_init(&txq->qresume_tsk, restart_ctrlq, (unsigned long)txq);
2184 txq->full = 0;
2185 return 0;
2186}
2187
2188int t4_sge_alloc_ofld_txq(struct adapter *adap, struct sge_ofld_txq *txq,
2189 struct net_device *dev, unsigned int iqid)
2190{
2191 int ret, nentries;
2192 struct fw_eq_ofld_cmd c;
2193 struct port_info *pi = netdev_priv(dev);
2194
2195 /* Add status entries */
2196 nentries = txq->q.size + STAT_LEN / sizeof(struct tx_desc);
2197
2198 txq->q.desc = alloc_ring(adap->pdev_dev, txq->q.size,
2199 sizeof(struct tx_desc), sizeof(struct tx_sw_desc),
2200 &txq->q.phys_addr, &txq->q.sdesc, STAT_LEN);
2201 if (!txq->q.desc)
2202 return -ENOMEM;
2203
2204 memset(&c, 0, sizeof(c));
2205 c.op_to_vfn = htonl(FW_CMD_OP(FW_EQ_OFLD_CMD) | FW_CMD_REQUEST |
2206 FW_CMD_WRITE | FW_CMD_EXEC |
2207 FW_EQ_OFLD_CMD_PFN(0) | FW_EQ_OFLD_CMD_VFN(0));
2208 c.alloc_to_len16 = htonl(FW_EQ_OFLD_CMD_ALLOC |
2209 FW_EQ_OFLD_CMD_EQSTART | FW_LEN16(c));
2210 c.fetchszm_to_iqid = htonl(FW_EQ_OFLD_CMD_HOSTFCMODE(2) |
2211 FW_EQ_OFLD_CMD_PCIECHN(pi->tx_chan) |
2212 FW_EQ_OFLD_CMD_IQID(iqid));
2213 c.dcaen_to_eqsize = htonl(FW_EQ_OFLD_CMD_FBMIN(2) |
2214 FW_EQ_OFLD_CMD_FBMAX(3) |
2215 FW_EQ_OFLD_CMD_CIDXFTHRESH(5) |
2216 FW_EQ_OFLD_CMD_EQSIZE(nentries));
2217 c.eqaddr = cpu_to_be64(txq->q.phys_addr);
2218
2219 ret = t4_wr_mbox(adap, 0, &c, sizeof(c), &c);
2220 if (ret) {
2221 kfree(txq->q.sdesc);
2222 txq->q.sdesc = NULL;
2223 dma_free_coherent(adap->pdev_dev,
2224 nentries * sizeof(struct tx_desc),
2225 txq->q.desc, txq->q.phys_addr);
2226 txq->q.desc = NULL;
2227 return ret;
2228 }
2229
2230 init_txq(adap, &txq->q, FW_EQ_OFLD_CMD_EQID_GET(ntohl(c.eqid_pkd)));
2231 txq->adap = adap;
2232 skb_queue_head_init(&txq->sendq);
2233 tasklet_init(&txq->qresume_tsk, restart_ofldq, (unsigned long)txq);
2234 txq->full = 0;
2235 txq->mapping_err = 0;
2236 return 0;
2237}
2238
2239static void free_txq(struct adapter *adap, struct sge_txq *q)
2240{
2241 dma_free_coherent(adap->pdev_dev,
2242 q->size * sizeof(struct tx_desc) + STAT_LEN,
2243 q->desc, q->phys_addr);
2244 q->cntxt_id = 0;
2245 q->sdesc = NULL;
2246 q->desc = NULL;
2247}
2248
2249static void free_rspq_fl(struct adapter *adap, struct sge_rspq *rq,
2250 struct sge_fl *fl)
2251{
2252 unsigned int fl_id = fl ? fl->cntxt_id : 0xffff;
2253
2254 adap->sge.ingr_map[rq->cntxt_id] = NULL;
2255 t4_iq_free(adap, 0, 0, 0, FW_IQ_TYPE_FL_INT_CAP, rq->cntxt_id, fl_id,
2256 0xffff);
2257 dma_free_coherent(adap->pdev_dev, (rq->size + 1) * rq->iqe_len,
2258 rq->desc, rq->phys_addr);
2259 netif_napi_del(&rq->napi);
2260 rq->netdev = NULL;
2261 rq->cntxt_id = rq->abs_id = 0;
2262 rq->desc = NULL;
2263
2264 if (fl) {
2265 free_rx_bufs(adap, fl, fl->avail);
2266 dma_free_coherent(adap->pdev_dev, fl->size * 8 + STAT_LEN,
2267 fl->desc, fl->addr);
2268 kfree(fl->sdesc);
2269 fl->sdesc = NULL;
2270 fl->cntxt_id = 0;
2271 fl->desc = NULL;
2272 }
2273}
2274
2275/**
2276 * t4_free_sge_resources - free SGE resources
2277 * @adap: the adapter
2278 *
2279 * Frees resources used by the SGE queue sets.
2280 */
2281void t4_free_sge_resources(struct adapter *adap)
2282{
2283 int i;
2284 struct sge_eth_rxq *eq = adap->sge.ethrxq;
2285 struct sge_eth_txq *etq = adap->sge.ethtxq;
2286 struct sge_ofld_rxq *oq = adap->sge.ofldrxq;
2287
2288 /* clean up Ethernet Tx/Rx queues */
2289 for (i = 0; i < adap->sge.ethqsets; i++, eq++, etq++) {
2290 if (eq->rspq.desc)
2291 free_rspq_fl(adap, &eq->rspq, &eq->fl);
2292 if (etq->q.desc) {
2293 t4_eth_eq_free(adap, 0, 0, 0, etq->q.cntxt_id);
2294 free_tx_desc(adap, &etq->q, etq->q.in_use, true);
2295 kfree(etq->q.sdesc);
2296 free_txq(adap, &etq->q);
2297 }
2298 }
2299
2300 /* clean up RDMA and iSCSI Rx queues */
2301 for (i = 0; i < adap->sge.ofldqsets; i++, oq++) {
2302 if (oq->rspq.desc)
2303 free_rspq_fl(adap, &oq->rspq, &oq->fl);
2304 }
2305 for (i = 0, oq = adap->sge.rdmarxq; i < adap->sge.rdmaqs; i++, oq++) {
2306 if (oq->rspq.desc)
2307 free_rspq_fl(adap, &oq->rspq, &oq->fl);
2308 }
2309
2310 /* clean up offload Tx queues */
2311 for (i = 0; i < ARRAY_SIZE(adap->sge.ofldtxq); i++) {
2312 struct sge_ofld_txq *q = &adap->sge.ofldtxq[i];
2313
2314 if (q->q.desc) {
2315 tasklet_kill(&q->qresume_tsk);
2316 t4_ofld_eq_free(adap, 0, 0, 0, q->q.cntxt_id);
2317 free_tx_desc(adap, &q->q, q->q.in_use, false);
2318 kfree(q->q.sdesc);
2319 __skb_queue_purge(&q->sendq);
2320 free_txq(adap, &q->q);
2321 }
2322 }
2323
2324 /* clean up control Tx queues */
2325 for (i = 0; i < ARRAY_SIZE(adap->sge.ctrlq); i++) {
2326 struct sge_ctrl_txq *cq = &adap->sge.ctrlq[i];
2327
2328 if (cq->q.desc) {
2329 tasklet_kill(&cq->qresume_tsk);
2330 t4_ctrl_eq_free(adap, 0, 0, 0, cq->q.cntxt_id);
2331 __skb_queue_purge(&cq->sendq);
2332 free_txq(adap, &cq->q);
2333 }
2334 }
2335
2336 if (adap->sge.fw_evtq.desc)
2337 free_rspq_fl(adap, &adap->sge.fw_evtq, NULL);
2338
2339 if (adap->sge.intrq.desc)
2340 free_rspq_fl(adap, &adap->sge.intrq, NULL);
2341
2342 /* clear the reverse egress queue map */
2343 memset(adap->sge.egr_map, 0, sizeof(adap->sge.egr_map));
2344}
2345
2346void t4_sge_start(struct adapter *adap)
2347{
2348 adap->sge.ethtxq_rover = 0;
2349 mod_timer(&adap->sge.rx_timer, jiffies + RX_QCHECK_PERIOD);
2350 mod_timer(&adap->sge.tx_timer, jiffies + TX_QCHECK_PERIOD);
2351}
2352
2353/**
2354 * t4_sge_stop - disable SGE operation
2355 * @adap: the adapter
2356 *
2357 * Stop tasklets and timers associated with the DMA engine. Note that
2358 * this is effective only if measures have been taken to disable any HW
2359 * events that may restart them.
2360 */
2361void t4_sge_stop(struct adapter *adap)
2362{
2363 int i;
2364 struct sge *s = &adap->sge;
2365
2366 if (in_interrupt()) /* actions below require waiting */
2367 return;
2368
2369 if (s->rx_timer.function)
2370 del_timer_sync(&s->rx_timer);
2371 if (s->tx_timer.function)
2372 del_timer_sync(&s->tx_timer);
2373
2374 for (i = 0; i < ARRAY_SIZE(s->ofldtxq); i++) {
2375 struct sge_ofld_txq *q = &s->ofldtxq[i];
2376
2377 if (q->q.desc)
2378 tasklet_kill(&q->qresume_tsk);
2379 }
2380 for (i = 0; i < ARRAY_SIZE(s->ctrlq); i++) {
2381 struct sge_ctrl_txq *cq = &s->ctrlq[i];
2382
2383 if (cq->q.desc)
2384 tasklet_kill(&cq->qresume_tsk);
2385 }
2386}
2387
2388/**
2389 * t4_sge_init - initialize SGE
2390 * @adap: the adapter
2391 *
2392 * Performs SGE initialization needed every time after a chip reset.
2393 * We do not initialize any of the queues here, instead the driver
2394 * top-level must request them individually.
2395 */
2396void t4_sge_init(struct adapter *adap)
2397{
2398 struct sge *s = &adap->sge;
2399 unsigned int fl_align_log = ilog2(FL_ALIGN);
2400
2401 t4_set_reg_field(adap, SGE_CONTROL, PKTSHIFT_MASK |
2402 INGPADBOUNDARY_MASK | EGRSTATUSPAGESIZE,
2403 INGPADBOUNDARY(fl_align_log - 5) | PKTSHIFT(2) |
2404 RXPKTCPLMODE |
2405 (STAT_LEN == 128 ? EGRSTATUSPAGESIZE : 0));
2406 t4_set_reg_field(adap, SGE_HOST_PAGE_SIZE, HOSTPAGESIZEPF0_MASK,
2407 HOSTPAGESIZEPF0(PAGE_SHIFT - 10));
2408 t4_write_reg(adap, SGE_FL_BUFFER_SIZE0, PAGE_SIZE);
2409#if FL_PG_ORDER > 0
2410 t4_write_reg(adap, SGE_FL_BUFFER_SIZE1, PAGE_SIZE << FL_PG_ORDER);
2411#endif
2412 t4_write_reg(adap, SGE_INGRESS_RX_THRESHOLD,
2413 THRESHOLD_0(s->counter_val[0]) |
2414 THRESHOLD_1(s->counter_val[1]) |
2415 THRESHOLD_2(s->counter_val[2]) |
2416 THRESHOLD_3(s->counter_val[3]));
2417 t4_write_reg(adap, SGE_TIMER_VALUE_0_AND_1,
2418 TIMERVALUE0(us_to_core_ticks(adap, s->timer_val[0])) |
2419 TIMERVALUE1(us_to_core_ticks(adap, s->timer_val[1])));
2420 t4_write_reg(adap, SGE_TIMER_VALUE_2_AND_3,
2421 TIMERVALUE0(us_to_core_ticks(adap, s->timer_val[2])) |
2422 TIMERVALUE1(us_to_core_ticks(adap, s->timer_val[3])));
2423 t4_write_reg(adap, SGE_TIMER_VALUE_4_AND_5,
2424 TIMERVALUE0(us_to_core_ticks(adap, s->timer_val[4])) |
2425 TIMERVALUE1(us_to_core_ticks(adap, s->timer_val[5])));
2426 setup_timer(&s->rx_timer, sge_rx_timer_cb, (unsigned long)adap);
2427 setup_timer(&s->tx_timer, sge_tx_timer_cb, (unsigned long)adap);
2428 s->starve_thres = core_ticks_per_usec(adap) * 1000000; /* 1 s */
2429 s->idma_state[0] = s->idma_state[1] = 0;
2430 spin_lock_init(&s->intrq_lock);
2431}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 20:08:43 -0500