1 /*-
2 * Copyright (c) 2010-2016 Solarflare Communications Inc.
3 * All rights reserved.
4 *
5 * This software was developed in part by Philip Paeps under contract for
6 * Solarflare Communications, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
19 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
27 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * The views and conclusions contained in the software and documentation are
30 * those of the authors and should not be interpreted as representing official
31 * policies, either expressed or implied, of the FreeBSD Project.
32 */
33
34 /* Theory of operation:
35 *
36 * Tx queues allocation and mapping
37 *
38 * One Tx queue with enabled checksum offload is allocated per Rx channel
39 * (event queue). Also 2 Tx queues (one without checksum offload and one
40 * with IP checksum offload only) are allocated and bound to event queue 0.
41 * sfxge_txq_type is used as Tx queue label.
42 *
43 * So, event queue plus label mapping to Tx queue index is:
44 * if event queue index is 0, TxQ-index = TxQ-label * [0..SFXGE_TXQ_NTYPES)
45 * else TxQ-index = SFXGE_TXQ_NTYPES + EvQ-index - 1
46 * See sfxge_get_txq_by_label() sfxge_ev.c
47 */
48
49 #include <sys/cdefs.h>
50 __FBSDID("$FreeBSD: releng/11.2/sys/dev/sfxge/sfxge_tx.c 331722 2018-03-29 02:50:57Z eadler $");
51
52 #include "opt_rss.h"
53
54 #include <sys/param.h>
55 #include <sys/malloc.h>
56 #include <sys/mbuf.h>
57 #include <sys/smp.h>
58 #include <sys/socket.h>
59 #include <sys/sysctl.h>
60 #include <sys/syslog.h>
61 #include <sys/limits.h>
62
63 #include <net/bpf.h>
64 #include <net/ethernet.h>
65 #include <net/if.h>
66 #include <net/if_vlan_var.h>
67
68 #include <netinet/in.h>
69 #include <netinet/ip.h>
70 #include <netinet/ip6.h>
71 #include <netinet/tcp.h>
72
73 #ifdef RSS
74 #include <net/rss_config.h>
75 #endif
76
77 #include "common/efx.h"
78
79 #include "sfxge.h"
80 #include "sfxge_tx.h"
81
82
83 #define SFXGE_PARAM_TX_DPL_GET_MAX SFXGE_PARAM(tx_dpl_get_max)
84 static int sfxge_tx_dpl_get_max = SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT;
85 TUNABLE_INT(SFXGE_PARAM_TX_DPL_GET_MAX, &sfxge_tx_dpl_get_max);
86 SYSCTL_INT(_hw_sfxge, OID_AUTO, tx_dpl_get_max, CTLFLAG_RDTUN,
87 &sfxge_tx_dpl_get_max, 0,
88 "Maximum number of any packets in deferred packet get-list");
89
90 #define SFXGE_PARAM_TX_DPL_GET_NON_TCP_MAX \
91 SFXGE_PARAM(tx_dpl_get_non_tcp_max)
92 static int sfxge_tx_dpl_get_non_tcp_max =
93 SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT;
94 TUNABLE_INT(SFXGE_PARAM_TX_DPL_GET_NON_TCP_MAX, &sfxge_tx_dpl_get_non_tcp_max);
95 SYSCTL_INT(_hw_sfxge, OID_AUTO, tx_dpl_get_non_tcp_max, CTLFLAG_RDTUN,
96 &sfxge_tx_dpl_get_non_tcp_max, 0,
97 "Maximum number of non-TCP packets in deferred packet get-list");
98
99 #define SFXGE_PARAM_TX_DPL_PUT_MAX SFXGE_PARAM(tx_dpl_put_max)
100 static int sfxge_tx_dpl_put_max = SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT;
101 TUNABLE_INT(SFXGE_PARAM_TX_DPL_PUT_MAX, &sfxge_tx_dpl_put_max);
102 SYSCTL_INT(_hw_sfxge, OID_AUTO, tx_dpl_put_max, CTLFLAG_RDTUN,
103 &sfxge_tx_dpl_put_max, 0,
104 "Maximum number of any packets in deferred packet put-list");
105
106 #define SFXGE_PARAM_TSO_FW_ASSISTED SFXGE_PARAM(tso_fw_assisted)
107 static int sfxge_tso_fw_assisted = (SFXGE_FATSOV1 | SFXGE_FATSOV2);
108 TUNABLE_INT(SFXGE_PARAM_TSO_FW_ASSISTED, &sfxge_tso_fw_assisted);
109 SYSCTL_INT(_hw_sfxge, OID_AUTO, tso_fw_assisted, CTLFLAG_RDTUN,
110 &sfxge_tso_fw_assisted, 0,
111 "Bitmask of FW-assisted TSO allowed to use if supported by NIC firmware");
112
113
114 static const struct {
115 const char *name;
116 size_t offset;
117 } sfxge_tx_stats[] = {
118 #define SFXGE_TX_STAT(name, member) \
119 { #name, offsetof(struct sfxge_txq, member) }
120 SFXGE_TX_STAT(tso_bursts, tso_bursts),
121 SFXGE_TX_STAT(tso_packets, tso_packets),
122 SFXGE_TX_STAT(tso_long_headers, tso_long_headers),
123 SFXGE_TX_STAT(tso_pdrop_too_many, tso_pdrop_too_many),
124 SFXGE_TX_STAT(tso_pdrop_no_rsrc, tso_pdrop_no_rsrc),
125 SFXGE_TX_STAT(tx_collapses, collapses),
126 SFXGE_TX_STAT(tx_drops, drops),
127 SFXGE_TX_STAT(tx_get_overflow, get_overflow),
128 SFXGE_TX_STAT(tx_get_non_tcp_overflow, get_non_tcp_overflow),
129 SFXGE_TX_STAT(tx_put_overflow, put_overflow),
130 SFXGE_TX_STAT(tx_netdown_drops, netdown_drops),
131 };
132
133
134 /* Forward declarations. */
135 static void sfxge_tx_qdpl_service(struct sfxge_txq *txq);
136 static void sfxge_tx_qlist_post(struct sfxge_txq *txq);
137 static void sfxge_tx_qunblock(struct sfxge_txq *txq);
138 static int sfxge_tx_queue_tso(struct sfxge_txq *txq, struct mbuf *mbuf,
139 const bus_dma_segment_t *dma_seg, int n_dma_seg,
140 int vlan_tagged);
141
142 static int
143 sfxge_tx_maybe_insert_tag(struct sfxge_txq *txq, struct mbuf *mbuf)
144 {
145 uint16_t this_tag = ((mbuf->m_flags & M_VLANTAG) ?
146 mbuf->m_pkthdr.ether_vtag :
147 0);
148
149 if (this_tag == txq->hw_vlan_tci)
150 return (0);
151
152 efx_tx_qdesc_vlantci_create(txq->common,
153 bswap16(this_tag),
154 &txq->pend_desc[0]);
155 txq->n_pend_desc = 1;
156 txq->hw_vlan_tci = this_tag;
157 return (1);
158 }
159
160 static inline void
161 sfxge_next_stmp(struct sfxge_txq *txq, struct sfxge_tx_mapping **pstmp)
162 {
163 KASSERT((*pstmp)->flags == 0, ("stmp flags are not 0"));
164 if (__predict_false(*pstmp ==
165 &txq->stmp[txq->ptr_mask]))
166 *pstmp = &txq->stmp[0];
167 else
168 (*pstmp)++;
169 }
170
171
172 void
173 sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq)
174 {
175 unsigned int completed;
176
177 SFXGE_EVQ_LOCK_ASSERT_OWNED(evq);
178
179 completed = txq->completed;
180 while (completed != txq->pending) {
181 struct sfxge_tx_mapping *stmp;
182 unsigned int id;
183
184 id = completed++ & txq->ptr_mask;
185
186 stmp = &txq->stmp[id];
187 if (stmp->flags & TX_BUF_UNMAP) {
188 bus_dmamap_unload(txq->packet_dma_tag, stmp->map);
189 if (stmp->flags & TX_BUF_MBUF) {
190 struct mbuf *m = stmp->u.mbuf;
191 do
192 m = m_free(m);
193 while (m != NULL);
194 } else {
195 free(stmp->u.heap_buf, M_SFXGE);
196 }
197 stmp->flags = 0;
198 }
199 }
200 txq->completed = completed;
201
202 /* Check whether we need to unblock the queue. */
203 mb();
204 if (txq->blocked) {
205 unsigned int level;
206
207 level = txq->added - txq->completed;
208 if (level <= SFXGE_TXQ_UNBLOCK_LEVEL(txq->entries))
209 sfxge_tx_qunblock(txq);
210 }
211 }
212
213 static unsigned int
214 sfxge_is_mbuf_non_tcp(struct mbuf *mbuf)
215 {
216 /* Absence of TCP checksum flags does not mean that it is non-TCP
217 * but it should be true if user wants to achieve high throughput.
218 */
219 return (!(mbuf->m_pkthdr.csum_flags & (CSUM_IP_TCP | CSUM_IP6_TCP)));
220 }
221
222 /*
223 * Reorder the put list and append it to the get list.
224 */
225 static void
226 sfxge_tx_qdpl_swizzle(struct sfxge_txq *txq)
227 {
228 struct sfxge_tx_dpl *stdp;
229 struct mbuf *mbuf, *get_next, **get_tailp;
230 volatile uintptr_t *putp;
231 uintptr_t put;
232 unsigned int count;
233 unsigned int non_tcp_count;
234
235 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
236
237 stdp = &txq->dpl;
238
239 /* Acquire the put list. */
240 putp = &stdp->std_put;
241 put = atomic_readandclear_ptr(putp);
242 mbuf = (void *)put;
243
244 if (mbuf == NULL)
245 return;
246
247 /* Reverse the put list. */
248 get_tailp = &mbuf->m_nextpkt;
249 get_next = NULL;
250
251 count = 0;
252 non_tcp_count = 0;
253 do {
254 struct mbuf *put_next;
255
256 non_tcp_count += sfxge_is_mbuf_non_tcp(mbuf);
257 put_next = mbuf->m_nextpkt;
258 mbuf->m_nextpkt = get_next;
259 get_next = mbuf;
260 mbuf = put_next;
261
262 count++;
263 } while (mbuf != NULL);
264
265 if (count > stdp->std_put_hiwat)
266 stdp->std_put_hiwat = count;
267
268 /* Append the reversed put list to the get list. */
269 KASSERT(*get_tailp == NULL, ("*get_tailp != NULL"));
270 *stdp->std_getp = get_next;
271 stdp->std_getp = get_tailp;
272 stdp->std_get_count += count;
273 stdp->std_get_non_tcp_count += non_tcp_count;
274 }
275
276 static void
277 sfxge_tx_qreap(struct sfxge_txq *txq)
278 {
279 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
280
281 txq->reaped = txq->completed;
282 }
283
284 static void
285 sfxge_tx_qlist_post(struct sfxge_txq *txq)
286 {
287 unsigned int old_added;
288 unsigned int block_level;
289 unsigned int level;
290 int rc;
291
292 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
293
294 KASSERT(txq->n_pend_desc != 0, ("txq->n_pend_desc == 0"));
295 KASSERT(txq->n_pend_desc <= txq->max_pkt_desc,
296 ("txq->n_pend_desc too large"));
297 KASSERT(!txq->blocked, ("txq->blocked"));
298
299 old_added = txq->added;
300
301 /* Post the fragment list. */
302 rc = efx_tx_qdesc_post(txq->common, txq->pend_desc, txq->n_pend_desc,
303 txq->reaped, &txq->added);
304 KASSERT(rc == 0, ("efx_tx_qdesc_post() failed"));
305
306 /* If efx_tx_qdesc_post() had to refragment, our information about
307 * buffers to free may be associated with the wrong
308 * descriptors.
309 */
310 KASSERT(txq->added - old_added == txq->n_pend_desc,
311 ("efx_tx_qdesc_post() refragmented descriptors"));
312
313 level = txq->added - txq->reaped;
314 KASSERT(level <= txq->entries, ("overfilled TX queue"));
315
316 /* Clear the fragment list. */
317 txq->n_pend_desc = 0;
318
319 /*
320 * Set the block level to ensure there is space to generate a
321 * large number of descriptors for TSO.
322 */
323 block_level = EFX_TXQ_LIMIT(txq->entries) - txq->max_pkt_desc;
324
325 /* Have we reached the block level? */
326 if (level < block_level)
327 return;
328
329 /* Reap, and check again */
330 sfxge_tx_qreap(txq);
331 level = txq->added - txq->reaped;
332 if (level < block_level)
333 return;
334
335 txq->blocked = 1;
336
337 /*
338 * Avoid a race with completion interrupt handling that could leave
339 * the queue blocked.
340 */
341 mb();
342 sfxge_tx_qreap(txq);
343 level = txq->added - txq->reaped;
344 if (level < block_level) {
345 mb();
346 txq->blocked = 0;
347 }
348 }
349
350 static int sfxge_tx_queue_mbuf(struct sfxge_txq *txq, struct mbuf *mbuf)
351 {
352 bus_dmamap_t *used_map;
353 bus_dmamap_t map;
354 bus_dma_segment_t dma_seg[SFXGE_TX_MAPPING_MAX_SEG];
355 unsigned int id;
356 struct sfxge_tx_mapping *stmp;
357 efx_desc_t *desc;
358 int n_dma_seg;
359 int rc;
360 int i;
361 int eop;
362 int vlan_tagged;
363
364 KASSERT(!txq->blocked, ("txq->blocked"));
365
366 #if SFXGE_TX_PARSE_EARLY
367 /*
368 * If software TSO is used, we still need to copy packet header,
369 * even if we have already parsed it early before enqueue.
370 */
371 if ((mbuf->m_pkthdr.csum_flags & CSUM_TSO) &&
372 (txq->tso_fw_assisted == 0))
373 prefetch_read_many(mbuf->m_data);
374 #else
375 /*
376 * Prefetch packet header since we need to parse it and extract
377 * IP ID, TCP sequence number and flags.
378 */
379 if (mbuf->m_pkthdr.csum_flags & CSUM_TSO)
380 prefetch_read_many(mbuf->m_data);
381 #endif
382
383 if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED)) {
384 rc = EINTR;
385 goto reject;
386 }
387
388 /* Load the packet for DMA. */
389 id = txq->added & txq->ptr_mask;
390 stmp = &txq->stmp[id];
391 rc = bus_dmamap_load_mbuf_sg(txq->packet_dma_tag, stmp->map,
392 mbuf, dma_seg, &n_dma_seg, 0);
393 if (rc == EFBIG) {
394 /* Try again. */
395 struct mbuf *new_mbuf = m_collapse(mbuf, M_NOWAIT,
396 SFXGE_TX_MAPPING_MAX_SEG);
397 if (new_mbuf == NULL)
398 goto reject;
399 ++txq->collapses;
400 mbuf = new_mbuf;
401 rc = bus_dmamap_load_mbuf_sg(txq->packet_dma_tag,
402 stmp->map, mbuf,
403 dma_seg, &n_dma_seg, 0);
404 }
405 if (rc != 0)
406 goto reject;
407
408 /* Make the packet visible to the hardware. */
409 bus_dmamap_sync(txq->packet_dma_tag, stmp->map, BUS_DMASYNC_PREWRITE);
410
411 used_map = &stmp->map;
412
413 vlan_tagged = sfxge_tx_maybe_insert_tag(txq, mbuf);
414 if (vlan_tagged) {
415 sfxge_next_stmp(txq, &stmp);
416 }
417 if (mbuf->m_pkthdr.csum_flags & CSUM_TSO) {
418 rc = sfxge_tx_queue_tso(txq, mbuf, dma_seg, n_dma_seg, vlan_tagged);
419 if (rc < 0)
420 goto reject_mapped;
421 stmp = &txq->stmp[(rc - 1) & txq->ptr_mask];
422 } else {
423 /* Add the mapping to the fragment list, and set flags
424 * for the buffer.
425 */
426
427 i = 0;
428 for (;;) {
429 desc = &txq->pend_desc[i + vlan_tagged];
430 eop = (i == n_dma_seg - 1);
431 efx_tx_qdesc_dma_create(txq->common,
432 dma_seg[i].ds_addr,
433 dma_seg[i].ds_len,
434 eop,
435 desc);
436 if (eop)
437 break;
438 i++;
439 sfxge_next_stmp(txq, &stmp);
440 }
441 txq->n_pend_desc = n_dma_seg + vlan_tagged;
442 }
443
444 /*
445 * If the mapping required more than one descriptor
446 * then we need to associate the DMA map with the last
447 * descriptor, not the first.
448 */
449 if (used_map != &stmp->map) {
450 map = stmp->map;
451 stmp->map = *used_map;
452 *used_map = map;
453 }
454
455 stmp->u.mbuf = mbuf;
456 stmp->flags = TX_BUF_UNMAP | TX_BUF_MBUF;
457
458 /* Post the fragment list. */
459 sfxge_tx_qlist_post(txq);
460
461 return (0);
462
463 reject_mapped:
464 bus_dmamap_unload(txq->packet_dma_tag, *used_map);
465 reject:
466 /* Drop the packet on the floor. */
467 m_freem(mbuf);
468 ++txq->drops;
469
470 return (rc);
471 }
472
473 /*
474 * Drain the deferred packet list into the transmit queue.
475 */
476 static void
477 sfxge_tx_qdpl_drain(struct sfxge_txq *txq)
478 {
479 struct sfxge_softc *sc;
480 struct sfxge_tx_dpl *stdp;
481 struct mbuf *mbuf, *next;
482 unsigned int count;
483 unsigned int non_tcp_count;
484 unsigned int pushed;
485 int rc;
486
487 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
488
489 sc = txq->sc;
490 stdp = &txq->dpl;
491 pushed = txq->added;
492
493 if (__predict_true(txq->init_state == SFXGE_TXQ_STARTED)) {
494 prefetch_read_many(sc->enp);
495 prefetch_read_many(txq->common);
496 }
497
498 mbuf = stdp->std_get;
499 count = stdp->std_get_count;
500 non_tcp_count = stdp->std_get_non_tcp_count;
501
502 if (count > stdp->std_get_hiwat)
503 stdp->std_get_hiwat = count;
504
505 while (count != 0) {
506 KASSERT(mbuf != NULL, ("mbuf == NULL"));
507
508 next = mbuf->m_nextpkt;
509 mbuf->m_nextpkt = NULL;
510
511 ETHER_BPF_MTAP(sc->ifnet, mbuf); /* packet capture */
512
513 if (next != NULL)
514 prefetch_read_many(next);
515
516 rc = sfxge_tx_queue_mbuf(txq, mbuf);
517 --count;
518 non_tcp_count -= sfxge_is_mbuf_non_tcp(mbuf);
519 mbuf = next;
520 if (rc != 0)
521 continue;
522
523 if (txq->blocked)
524 break;
525
526 /* Push the fragments to the hardware in batches. */
527 if (txq->added - pushed >= SFXGE_TX_BATCH) {
528 efx_tx_qpush(txq->common, txq->added, pushed);
529 pushed = txq->added;
530 }
531 }
532
533 if (count == 0) {
534 KASSERT(mbuf == NULL, ("mbuf != NULL"));
535 KASSERT(non_tcp_count == 0,
536 ("inconsistent TCP/non-TCP detection"));
537 stdp->std_get = NULL;
538 stdp->std_get_count = 0;
539 stdp->std_get_non_tcp_count = 0;
540 stdp->std_getp = &stdp->std_get;
541 } else {
542 stdp->std_get = mbuf;
543 stdp->std_get_count = count;
544 stdp->std_get_non_tcp_count = non_tcp_count;
545 }
546
547 if (txq->added != pushed)
548 efx_tx_qpush(txq->common, txq->added, pushed);
549
550 KASSERT(txq->blocked || stdp->std_get_count == 0,
551 ("queue unblocked but count is non-zero"));
552 }
553
554 #define SFXGE_TX_QDPL_PENDING(_txq) ((_txq)->dpl.std_put != 0)
555
556 /*
557 * Service the deferred packet list.
558 *
559 * NOTE: drops the txq mutex!
560 */
561 static void
562 sfxge_tx_qdpl_service(struct sfxge_txq *txq)
563 {
564 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
565
566 do {
567 if (SFXGE_TX_QDPL_PENDING(txq))
568 sfxge_tx_qdpl_swizzle(txq);
569
570 if (!txq->blocked)
571 sfxge_tx_qdpl_drain(txq);
572
573 SFXGE_TXQ_UNLOCK(txq);
574 } while (SFXGE_TX_QDPL_PENDING(txq) &&
575 SFXGE_TXQ_TRYLOCK(txq));
576 }
577
578 /*
579 * Put a packet on the deferred packet get-list.
580 */
581 static int
582 sfxge_tx_qdpl_put_locked(struct sfxge_txq *txq, struct mbuf *mbuf)
583 {
584 struct sfxge_tx_dpl *stdp;
585
586 stdp = &txq->dpl;
587
588 KASSERT(mbuf->m_nextpkt == NULL, ("mbuf->m_nextpkt != NULL"));
589
590 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
591
592 if (stdp->std_get_count >= stdp->std_get_max) {
593 txq->get_overflow++;
594 return (ENOBUFS);
595 }
596 if (sfxge_is_mbuf_non_tcp(mbuf)) {
597 if (stdp->std_get_non_tcp_count >=
598 stdp->std_get_non_tcp_max) {
599 txq->get_non_tcp_overflow++;
600 return (ENOBUFS);
601 }
602 stdp->std_get_non_tcp_count++;
603 }
604
605 *(stdp->std_getp) = mbuf;
606 stdp->std_getp = &mbuf->m_nextpkt;
607 stdp->std_get_count++;
608
609 return (0);
610 }
611
612 /*
613 * Put a packet on the deferred packet put-list.
614 *
615 * We overload the csum_data field in the mbuf to keep track of this length
616 * because there is no cheap alternative to avoid races.
617 */
618 static int
619 sfxge_tx_qdpl_put_unlocked(struct sfxge_txq *txq, struct mbuf *mbuf)
620 {
621 struct sfxge_tx_dpl *stdp;
622 volatile uintptr_t *putp;
623 uintptr_t old;
624 uintptr_t new;
625 unsigned int put_count;
626
627 KASSERT(mbuf->m_nextpkt == NULL, ("mbuf->m_nextpkt != NULL"));
628
629 SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(txq);
630
631 stdp = &txq->dpl;
632 putp = &stdp->std_put;
633 new = (uintptr_t)mbuf;
634
635 do {
636 old = *putp;
637 if (old != 0) {
638 struct mbuf *mp = (struct mbuf *)old;
639 put_count = mp->m_pkthdr.csum_data;
640 } else
641 put_count = 0;
642 if (put_count >= stdp->std_put_max) {
643 atomic_add_long(&txq->put_overflow, 1);
644 return (ENOBUFS);
645 }
646 mbuf->m_pkthdr.csum_data = put_count + 1;
647 mbuf->m_nextpkt = (void *)old;
648 } while (atomic_cmpset_ptr(putp, old, new) == 0);
649
650 return (0);
651 }
652
653 /*
654 * Called from if_transmit - will try to grab the txq lock and enqueue to the
655 * put list if it succeeds, otherwise try to push onto the defer list if space.
656 */
657 static int
658 sfxge_tx_packet_add(struct sfxge_txq *txq, struct mbuf *m)
659 {
660 int rc;
661
662 if (!SFXGE_LINK_UP(txq->sc)) {
663 atomic_add_long(&txq->netdown_drops, 1);
664 return (ENETDOWN);
665 }
666
667 /*
668 * Try to grab the txq lock. If we are able to get the lock,
669 * the packet will be appended to the "get list" of the deferred
670 * packet list. Otherwise, it will be pushed on the "put list".
671 */
672 if (SFXGE_TXQ_TRYLOCK(txq)) {
673 /* First swizzle put-list to get-list to keep order */
674 sfxge_tx_qdpl_swizzle(txq);
675
676 rc = sfxge_tx_qdpl_put_locked(txq, m);
677
678 /* Try to service the list. */
679 sfxge_tx_qdpl_service(txq);
680 /* Lock has been dropped. */
681 } else {
682 rc = sfxge_tx_qdpl_put_unlocked(txq, m);
683
684 /*
685 * Try to grab the lock again.
686 *
687 * If we are able to get the lock, we need to process
688 * the deferred packet list. If we are not able to get
689 * the lock, another thread is processing the list.
690 */
691 if ((rc == 0) && SFXGE_TXQ_TRYLOCK(txq)) {
692 sfxge_tx_qdpl_service(txq);
693 /* Lock has been dropped. */
694 }
695 }
696
697 SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(txq);
698
699 return (rc);
700 }
701
702 static void
703 sfxge_tx_qdpl_flush(struct sfxge_txq *txq)
704 {
705 struct sfxge_tx_dpl *stdp = &txq->dpl;
706 struct mbuf *mbuf, *next;
707
708 SFXGE_TXQ_LOCK(txq);
709
710 sfxge_tx_qdpl_swizzle(txq);
711 for (mbuf = stdp->std_get; mbuf != NULL; mbuf = next) {
712 next = mbuf->m_nextpkt;
713 m_freem(mbuf);
714 }
715 stdp->std_get = NULL;
716 stdp->std_get_count = 0;
717 stdp->std_get_non_tcp_count = 0;
718 stdp->std_getp = &stdp->std_get;
719
720 SFXGE_TXQ_UNLOCK(txq);
721 }
722
723 void
724 sfxge_if_qflush(struct ifnet *ifp)
725 {
726 struct sfxge_softc *sc;
727 unsigned int i;
728
729 sc = ifp->if_softc;
730
731 for (i = 0; i < sc->txq_count; i++)
732 sfxge_tx_qdpl_flush(sc->txq[i]);
733 }
734
735 #if SFXGE_TX_PARSE_EARLY
736
737 /* There is little space for user data in mbuf pkthdr, so we
738 * use l*hlen fields which are not used by the driver otherwise
739 * to store header offsets.
740 * The fields are 8-bit, but it's ok, no header may be longer than 255 bytes.
741 */
742
743
744 #define TSO_MBUF_PROTO(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.sixteen[0])
745 /* We abuse l5hlen here because PH_loc can hold only 64 bits of data */
746 #define TSO_MBUF_FLAGS(_mbuf) ((_mbuf)->m_pkthdr.l5hlen)
747 #define TSO_MBUF_PACKETID(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.sixteen[1])
748 #define TSO_MBUF_SEQNUM(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.thirtytwo[1])
749
750 static void sfxge_parse_tx_packet(struct mbuf *mbuf)
751 {
752 struct ether_header *eh = mtod(mbuf, struct ether_header *);
753 const struct tcphdr *th;
754 struct tcphdr th_copy;
755
756 /* Find network protocol and header */
757 TSO_MBUF_PROTO(mbuf) = eh->ether_type;
758 if (TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_VLAN)) {
759 struct ether_vlan_header *veh =
760 mtod(mbuf, struct ether_vlan_header *);
761 TSO_MBUF_PROTO(mbuf) = veh->evl_proto;
762 mbuf->m_pkthdr.l2hlen = sizeof(*veh);
763 } else {
764 mbuf->m_pkthdr.l2hlen = sizeof(*eh);
765 }
766
767 /* Find TCP header */
768 if (TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_IP)) {
769 const struct ip *iph = (const struct ip *)mtodo(mbuf, mbuf->m_pkthdr.l2hlen);
770
771 KASSERT(iph->ip_p == IPPROTO_TCP,
772 ("TSO required on non-TCP packet"));
773 mbuf->m_pkthdr.l3hlen = mbuf->m_pkthdr.l2hlen + 4 * iph->ip_hl;
774 TSO_MBUF_PACKETID(mbuf) = iph->ip_id;
775 } else {
776 KASSERT(TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_IPV6),
777 ("TSO required on non-IP packet"));
778 KASSERT(((const struct ip6_hdr *)mtodo(mbuf, mbuf->m_pkthdr.l2hlen))->ip6_nxt ==
779 IPPROTO_TCP,
780 ("TSO required on non-TCP packet"));
781 mbuf->m_pkthdr.l3hlen = mbuf->m_pkthdr.l2hlen + sizeof(struct ip6_hdr);
782 TSO_MBUF_PACKETID(mbuf) = 0;
783 }
784
785 KASSERT(mbuf->m_len >= mbuf->m_pkthdr.l3hlen,
786 ("network header is fragmented in mbuf"));
787
788 /* We need TCP header including flags (window is the next) */
789 if (mbuf->m_len < mbuf->m_pkthdr.l3hlen + offsetof(struct tcphdr, th_win)) {
790 m_copydata(mbuf, mbuf->m_pkthdr.l3hlen, sizeof(th_copy),
791 (caddr_t)&th_copy);
792 th = &th_copy;
793 } else {
794 th = (const struct tcphdr *)mtodo(mbuf, mbuf->m_pkthdr.l3hlen);
795 }
796
797 mbuf->m_pkthdr.l4hlen = mbuf->m_pkthdr.l3hlen + 4 * th->th_off;
798 TSO_MBUF_SEQNUM(mbuf) = ntohl(th->th_seq);
799
800 /* These flags must not be duplicated */
801 /*
802 * RST should not be duplicated as well, but FreeBSD kernel
803 * generates TSO packets with RST flag. So, do not assert
804 * its absence.
805 */
806 KASSERT(!(th->th_flags & (TH_URG | TH_SYN)),
807 ("incompatible TCP flag 0x%x on TSO packet",
808 th->th_flags & (TH_URG | TH_SYN)));
809 TSO_MBUF_FLAGS(mbuf) = th->th_flags;
810 }
811 #endif
812
813 /*
814 * TX start -- called by the stack.
815 */
816 int
817 sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m)
818 {
819 struct sfxge_softc *sc;
820 struct sfxge_txq *txq;
821 int rc;
822
823 sc = (struct sfxge_softc *)ifp->if_softc;
824
825 /*
826 * Transmit may be called when interface is up from the kernel
827 * point of view, but not yet up (in progress) from the driver
828 * point of view. I.e. link aggregation bring up.
829 * Transmit may be called when interface is up from the driver
830 * point of view, but already down from the kernel point of
831 * view. I.e. Rx when interface shutdown is in progress.
832 */
833 KASSERT((ifp->if_flags & IFF_UP) || (sc->if_flags & IFF_UP),
834 ("interface not up"));
835
836 /* Pick the desired transmit queue. */
837 if (m->m_pkthdr.csum_flags &
838 (CSUM_DELAY_DATA | CSUM_TCP_IPV6 | CSUM_UDP_IPV6 | CSUM_TSO)) {
839 int index = 0;
840
841 #ifdef RSS
842 uint32_t bucket_id;
843
844 /*
845 * Select a TX queue which matches the corresponding
846 * RX queue for the hash in order to assign both
847 * TX and RX parts of the flow to the same CPU
848 */
849 if (rss_m2bucket(m, &bucket_id) == 0)
850 index = bucket_id % (sc->txq_count - (SFXGE_TXQ_NTYPES - 1));
851 #else
852 /* check if flowid is set */
853 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
854 uint32_t hash = m->m_pkthdr.flowid;
855 uint32_t idx = hash % nitems(sc->rx_indir_table);
856
857 index = sc->rx_indir_table[idx];
858 }
859 #endif
860 #if SFXGE_TX_PARSE_EARLY
861 if (m->m_pkthdr.csum_flags & CSUM_TSO)
862 sfxge_parse_tx_packet(m);
863 #endif
864 txq = sc->txq[SFXGE_TXQ_IP_TCP_UDP_CKSUM + index];
865 } else if (m->m_pkthdr.csum_flags & CSUM_DELAY_IP) {
866 txq = sc->txq[SFXGE_TXQ_IP_CKSUM];
867 } else {
868 txq = sc->txq[SFXGE_TXQ_NON_CKSUM];
869 }
870
871 rc = sfxge_tx_packet_add(txq, m);
872 if (rc != 0)
873 m_freem(m);
874
875 return (rc);
876 }
877
878 /*
879 * Software "TSO". Not quite as good as doing it in hardware, but
880 * still faster than segmenting in the stack.
881 */
882
883 struct sfxge_tso_state {
884 /* Output position */
885 unsigned out_len; /* Remaining length in current segment */
886 unsigned seqnum; /* Current sequence number */
887 unsigned packet_space; /* Remaining space in current packet */
888 unsigned segs_space; /* Remaining number of DMA segments
889 for the packet (FATSOv2 only) */
890
891 /* Input position */
892 uint64_t dma_addr; /* DMA address of current position */
893 unsigned in_len; /* Remaining length in current mbuf */
894
895 const struct mbuf *mbuf; /* Input mbuf (head of chain) */
896 u_short protocol; /* Network protocol (after VLAN decap) */
897 ssize_t nh_off; /* Offset of network header */
898 ssize_t tcph_off; /* Offset of TCP header */
899 unsigned header_len; /* Number of bytes of header */
900 unsigned seg_size; /* TCP segment size */
901 int fw_assisted; /* Use FW-assisted TSO */
902 u_short packet_id; /* IPv4 packet ID from the original packet */
903 uint8_t tcp_flags; /* TCP flags */
904 efx_desc_t header_desc; /* Precomputed header descriptor for
905 * FW-assisted TSO */
906 };
907
908 #if !SFXGE_TX_PARSE_EARLY
909 static const struct ip *tso_iph(const struct sfxge_tso_state *tso)
910 {
911 KASSERT(tso->protocol == htons(ETHERTYPE_IP),
912 ("tso_iph() in non-IPv4 state"));
913 return (const struct ip *)(tso->mbuf->m_data + tso->nh_off);
914 }
915
916 static __unused const struct ip6_hdr *tso_ip6h(const struct sfxge_tso_state *tso)
917 {
918 KASSERT(tso->protocol == htons(ETHERTYPE_IPV6),
919 ("tso_ip6h() in non-IPv6 state"));
920 return (const struct ip6_hdr *)(tso->mbuf->m_data + tso->nh_off);
921 }
922
923 static const struct tcphdr *tso_tcph(const struct sfxge_tso_state *tso)
924 {
925 return (const struct tcphdr *)(tso->mbuf->m_data + tso->tcph_off);
926 }
927 #endif
928
929
930 /* Size of preallocated TSO header buffers. Larger blocks must be
931 * allocated from the heap.
932 */
933 #define TSOH_STD_SIZE 128
934
935 /* At most half the descriptors in the queue at any time will refer to
936 * a TSO header buffer, since they must always be followed by a
937 * payload descriptor referring to an mbuf.
938 */
939 #define TSOH_COUNT(_txq_entries) ((_txq_entries) / 2u)
940 #define TSOH_PER_PAGE (PAGE_SIZE / TSOH_STD_SIZE)
941 #define TSOH_PAGE_COUNT(_txq_entries) \
942 howmany(TSOH_COUNT(_txq_entries), TSOH_PER_PAGE)
943
944 static int tso_init(struct sfxge_txq *txq)
945 {
946 struct sfxge_softc *sc = txq->sc;
947 unsigned int tsoh_page_count = TSOH_PAGE_COUNT(sc->txq_entries);
948 int i, rc;
949
950 /* Allocate TSO header buffers */
951 txq->tsoh_buffer = malloc(tsoh_page_count * sizeof(txq->tsoh_buffer[0]),
952 M_SFXGE, M_WAITOK);
953
954 for (i = 0; i < tsoh_page_count; i++) {
955 rc = sfxge_dma_alloc(sc, PAGE_SIZE, &txq->tsoh_buffer[i]);
956 if (rc != 0)
957 goto fail;
958 }
959
960 return (0);
961
962 fail:
963 while (i-- > 0)
964 sfxge_dma_free(&txq->tsoh_buffer[i]);
965 free(txq->tsoh_buffer, M_SFXGE);
966 txq->tsoh_buffer = NULL;
967 return (rc);
968 }
969
970 static void tso_fini(struct sfxge_txq *txq)
971 {
972 int i;
973
974 if (txq->tsoh_buffer != NULL) {
975 for (i = 0; i < TSOH_PAGE_COUNT(txq->sc->txq_entries); i++)
976 sfxge_dma_free(&txq->tsoh_buffer[i]);
977 free(txq->tsoh_buffer, M_SFXGE);
978 }
979 }
980
981 static void tso_start(struct sfxge_txq *txq, struct sfxge_tso_state *tso,
982 const bus_dma_segment_t *hdr_dma_seg,
983 struct mbuf *mbuf)
984 {
985 const efx_nic_cfg_t *encp = efx_nic_cfg_get(txq->sc->enp);
986 #if !SFXGE_TX_PARSE_EARLY
987 struct ether_header *eh = mtod(mbuf, struct ether_header *);
988 const struct tcphdr *th;
989 struct tcphdr th_copy;
990 #endif
991
992 tso->fw_assisted = txq->tso_fw_assisted;
993 tso->mbuf = mbuf;
994
995 /* Find network protocol and header */
996 #if !SFXGE_TX_PARSE_EARLY
997 tso->protocol = eh->ether_type;
998 if (tso->protocol == htons(ETHERTYPE_VLAN)) {
999 struct ether_vlan_header *veh =
1000 mtod(mbuf, struct ether_vlan_header *);
1001 tso->protocol = veh->evl_proto;
1002 tso->nh_off = sizeof(*veh);
1003 } else {
1004 tso->nh_off = sizeof(*eh);
1005 }
1006 #else
1007 tso->protocol = TSO_MBUF_PROTO(mbuf);
1008 tso->nh_off = mbuf->m_pkthdr.l2hlen;
1009 tso->tcph_off = mbuf->m_pkthdr.l3hlen;
1010 tso->packet_id = ntohs(TSO_MBUF_PACKETID(mbuf));
1011 #endif
1012
1013 #if !SFXGE_TX_PARSE_EARLY
1014 /* Find TCP header */
1015 if (tso->protocol == htons(ETHERTYPE_IP)) {
1016 KASSERT(tso_iph(tso)->ip_p == IPPROTO_TCP,
1017 ("TSO required on non-TCP packet"));
1018 tso->tcph_off = tso->nh_off + 4 * tso_iph(tso)->ip_hl;
1019 tso->packet_id = ntohs(tso_iph(tso)->ip_id);
1020 } else {
1021 KASSERT(tso->protocol == htons(ETHERTYPE_IPV6),
1022 ("TSO required on non-IP packet"));
1023 KASSERT(tso_ip6h(tso)->ip6_nxt == IPPROTO_TCP,
1024 ("TSO required on non-TCP packet"));
1025 tso->tcph_off = tso->nh_off + sizeof(struct ip6_hdr);
1026 tso->packet_id = 0;
1027 }
1028 #endif
1029
1030
1031 if (tso->fw_assisted &&
1032 __predict_false(tso->tcph_off >
1033 encp->enc_tx_tso_tcp_header_offset_limit)) {
1034 tso->fw_assisted = 0;
1035 }
1036
1037
1038 #if !SFXGE_TX_PARSE_EARLY
1039 KASSERT(mbuf->m_len >= tso->tcph_off,
1040 ("network header is fragmented in mbuf"));
1041 /* We need TCP header including flags (window is the next) */
1042 if (mbuf->m_len < tso->tcph_off + offsetof(struct tcphdr, th_win)) {
1043 m_copydata(tso->mbuf, tso->tcph_off, sizeof(th_copy),
1044 (caddr_t)&th_copy);
1045 th = &th_copy;
1046 } else {
1047 th = tso_tcph(tso);
1048 }
1049 tso->header_len = tso->tcph_off + 4 * th->th_off;
1050 #else
1051 tso->header_len = mbuf->m_pkthdr.l4hlen;
1052 #endif
1053 tso->seg_size = mbuf->m_pkthdr.tso_segsz;
1054
1055 #if !SFXGE_TX_PARSE_EARLY
1056 tso->seqnum = ntohl(th->th_seq);
1057
1058 /* These flags must not be duplicated */
1059 /*
1060 * RST should not be duplicated as well, but FreeBSD kernel
1061 * generates TSO packets with RST flag. So, do not assert
1062 * its absence.
1063 */
1064 KASSERT(!(th->th_flags & (TH_URG | TH_SYN)),
1065 ("incompatible TCP flag 0x%x on TSO packet",
1066 th->th_flags & (TH_URG | TH_SYN)));
1067 tso->tcp_flags = th->th_flags;
1068 #else
1069 tso->seqnum = TSO_MBUF_SEQNUM(mbuf);
1070 tso->tcp_flags = TSO_MBUF_FLAGS(mbuf);
1071 #endif
1072
1073 tso->out_len = mbuf->m_pkthdr.len - tso->header_len;
1074
1075 if (tso->fw_assisted) {
1076 if (hdr_dma_seg->ds_len >= tso->header_len)
1077 efx_tx_qdesc_dma_create(txq->common,
1078 hdr_dma_seg->ds_addr,
1079 tso->header_len,
1080 B_FALSE,
1081 &tso->header_desc);
1082 else
1083 tso->fw_assisted = 0;
1084 }
1085 }
1086
1087 /*
1088 * tso_fill_packet_with_fragment - form descriptors for the current fragment
1089 *
1090 * Form descriptors for the current fragment, until we reach the end
1091 * of fragment or end-of-packet. Return 0 on success, 1 if not enough
1092 * space.
1093 */
1094 static void tso_fill_packet_with_fragment(struct sfxge_txq *txq,
1095 struct sfxge_tso_state *tso)
1096 {
1097 efx_desc_t *desc;
1098 int n;
1099 uint64_t dma_addr = tso->dma_addr;
1100 boolean_t eop;
1101
1102 if (tso->in_len == 0 || tso->packet_space == 0)
1103 return;
1104
1105 KASSERT(tso->in_len > 0, ("TSO input length went negative"));
1106 KASSERT(tso->packet_space > 0, ("TSO packet space went negative"));
1107
1108 if (tso->fw_assisted & SFXGE_FATSOV2) {
1109 n = tso->in_len;
1110 tso->out_len -= n;
1111 tso->seqnum += n;
1112 tso->in_len = 0;
1113 if (n < tso->packet_space) {
1114 tso->packet_space -= n;
1115 tso->segs_space--;
1116 } else {
1117 tso->packet_space = tso->seg_size -
1118 (n - tso->packet_space) % tso->seg_size;
1119 tso->segs_space =
1120 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1 -
1121 (tso->packet_space != tso->seg_size);
1122 }
1123 } else {
1124 n = min(tso->in_len, tso->packet_space);
1125 tso->packet_space -= n;
1126 tso->out_len -= n;
1127 tso->dma_addr += n;
1128 tso->in_len -= n;
1129 }
1130
1131 /*
1132 * It is OK to use binary OR below to avoid extra branching
1133 * since all conditions may always be checked.
1134 */
1135 eop = (tso->out_len == 0) | (tso->packet_space == 0) |
1136 (tso->segs_space == 0);
1137
1138 desc = &txq->pend_desc[txq->n_pend_desc++];
1139 efx_tx_qdesc_dma_create(txq->common, dma_addr, n, eop, desc);
1140 }
1141
1142 /* Callback from bus_dmamap_load() for long TSO headers. */
1143 static void tso_map_long_header(void *dma_addr_ret,
1144 bus_dma_segment_t *segs, int nseg,
1145 int error)
1146 {
1147 *(uint64_t *)dma_addr_ret = ((__predict_true(error == 0) &&
1148 __predict_true(nseg == 1)) ?
1149 segs->ds_addr : 0);
1150 }
1151
1152 /*
1153 * tso_start_new_packet - generate a new header and prepare for the new packet
1154 *
1155 * Generate a new header and prepare for the new packet. Return 0 on
1156 * success, or an error code if failed to alloc header.
1157 */
1158 static int tso_start_new_packet(struct sfxge_txq *txq,
1159 struct sfxge_tso_state *tso,
1160 unsigned int *idp)
1161 {
1162 unsigned int id = *idp;
1163 struct tcphdr *tsoh_th;
1164 unsigned ip_length;
1165 caddr_t header;
1166 uint64_t dma_addr;
1167 bus_dmamap_t map;
1168 efx_desc_t *desc;
1169 int rc;
1170
1171 if (tso->fw_assisted) {
1172 if (tso->fw_assisted & SFXGE_FATSOV2) {
1173 /* Add 2 FATSOv2 option descriptors */
1174 desc = &txq->pend_desc[txq->n_pend_desc];
1175 efx_tx_qdesc_tso2_create(txq->common,
1176 tso->packet_id,
1177 tso->seqnum,
1178 tso->seg_size,
1179 desc,
1180 EFX_TX_FATSOV2_OPT_NDESCS);
1181 desc += EFX_TX_FATSOV2_OPT_NDESCS;
1182 txq->n_pend_desc += EFX_TX_FATSOV2_OPT_NDESCS;
1183 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0"));
1184 id = (id + EFX_TX_FATSOV2_OPT_NDESCS) & txq->ptr_mask;
1185
1186 tso->segs_space =
1187 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1;
1188 } else {
1189 uint8_t tcp_flags = tso->tcp_flags;
1190
1191 if (tso->out_len > tso->seg_size)
1192 tcp_flags &= ~(TH_FIN | TH_PUSH);
1193
1194 /* Add FATSOv1 option descriptor */
1195 desc = &txq->pend_desc[txq->n_pend_desc++];
1196 efx_tx_qdesc_tso_create(txq->common,
1197 tso->packet_id,
1198 tso->seqnum,
1199 tcp_flags,
1200 desc++);
1201 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0"));
1202 id = (id + 1) & txq->ptr_mask;
1203
1204 tso->seqnum += tso->seg_size;
1205 tso->segs_space = UINT_MAX;
1206 }
1207
1208 /* Header DMA descriptor */
1209 *desc = tso->header_desc;
1210 txq->n_pend_desc++;
1211 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0"));
1212 id = (id + 1) & txq->ptr_mask;
1213 } else {
1214 /* Allocate a DMA-mapped header buffer. */
1215 if (__predict_true(tso->header_len <= TSOH_STD_SIZE)) {
1216 unsigned int page_index = (id / 2) / TSOH_PER_PAGE;
1217 unsigned int buf_index = (id / 2) % TSOH_PER_PAGE;
1218
1219 header = (txq->tsoh_buffer[page_index].esm_base +
1220 buf_index * TSOH_STD_SIZE);
1221 dma_addr = (txq->tsoh_buffer[page_index].esm_addr +
1222 buf_index * TSOH_STD_SIZE);
1223 map = txq->tsoh_buffer[page_index].esm_map;
1224
1225 KASSERT(txq->stmp[id].flags == 0,
1226 ("stmp flags are not 0"));
1227 } else {
1228 struct sfxge_tx_mapping *stmp = &txq->stmp[id];
1229
1230 /* We cannot use bus_dmamem_alloc() as that may sleep */
1231 header = malloc(tso->header_len, M_SFXGE, M_NOWAIT);
1232 if (__predict_false(!header))
1233 return (ENOMEM);
1234 rc = bus_dmamap_load(txq->packet_dma_tag, stmp->map,
1235 header, tso->header_len,
1236 tso_map_long_header, &dma_addr,
1237 BUS_DMA_NOWAIT);
1238 if (__predict_false(dma_addr == 0)) {
1239 if (rc == 0) {
1240 /* Succeeded but got >1 segment */
1241 bus_dmamap_unload(txq->packet_dma_tag,
1242 stmp->map);
1243 rc = EINVAL;
1244 }
1245 free(header, M_SFXGE);
1246 return (rc);
1247 }
1248 map = stmp->map;
1249
1250 txq->tso_long_headers++;
1251 stmp->u.heap_buf = header;
1252 stmp->flags = TX_BUF_UNMAP;
1253 }
1254
1255 tsoh_th = (struct tcphdr *)(header + tso->tcph_off);
1256
1257 /* Copy and update the headers. */
1258 m_copydata(tso->mbuf, 0, tso->header_len, header);
1259
1260 tsoh_th->th_seq = htonl(tso->seqnum);
1261 tso->seqnum += tso->seg_size;
1262 if (tso->out_len > tso->seg_size) {
1263 /* This packet will not finish the TSO burst. */
1264 ip_length = tso->header_len - tso->nh_off + tso->seg_size;
1265 tsoh_th->th_flags &= ~(TH_FIN | TH_PUSH);
1266 } else {
1267 /* This packet will be the last in the TSO burst. */
1268 ip_length = tso->header_len - tso->nh_off + tso->out_len;
1269 }
1270
1271 if (tso->protocol == htons(ETHERTYPE_IP)) {
1272 struct ip *tsoh_iph = (struct ip *)(header + tso->nh_off);
1273 tsoh_iph->ip_len = htons(ip_length);
1274 /* XXX We should increment ip_id, but FreeBSD doesn't
1275 * currently allocate extra IDs for multiple segments.
1276 */
1277 } else {
1278 struct ip6_hdr *tsoh_iph =
1279 (struct ip6_hdr *)(header + tso->nh_off);
1280 tsoh_iph->ip6_plen = htons(ip_length - sizeof(*tsoh_iph));
1281 }
1282
1283 /* Make the header visible to the hardware. */
1284 bus_dmamap_sync(txq->packet_dma_tag, map, BUS_DMASYNC_PREWRITE);
1285
1286 /* Form a descriptor for this header. */
1287 desc = &txq->pend_desc[txq->n_pend_desc++];
1288 efx_tx_qdesc_dma_create(txq->common,
1289 dma_addr,
1290 tso->header_len,
1291 0,
1292 desc);
1293 id = (id + 1) & txq->ptr_mask;
1294
1295 tso->segs_space = UINT_MAX;
1296 }
1297 tso->packet_space = tso->seg_size;
1298 txq->tso_packets++;
1299 *idp = id;
1300
1301 return (0);
1302 }
1303
1304 static int
1305 sfxge_tx_queue_tso(struct sfxge_txq *txq, struct mbuf *mbuf,
1306 const bus_dma_segment_t *dma_seg, int n_dma_seg,
1307 int vlan_tagged)
1308 {
1309 struct sfxge_tso_state tso;
1310 unsigned int id;
1311 unsigned skipped = 0;
1312
1313 tso_start(txq, &tso, dma_seg, mbuf);
1314
1315 while (dma_seg->ds_len + skipped <= tso.header_len) {
1316 skipped += dma_seg->ds_len;
1317 --n_dma_seg;
1318 KASSERT(n_dma_seg, ("no payload found in TSO packet"));
1319 ++dma_seg;
1320 }
1321 tso.in_len = dma_seg->ds_len - (tso.header_len - skipped);
1322 tso.dma_addr = dma_seg->ds_addr + (tso.header_len - skipped);
1323
1324 id = (txq->added + vlan_tagged) & txq->ptr_mask;
1325 if (__predict_false(tso_start_new_packet(txq, &tso, &id)))
1326 return (-1);
1327
1328 while (1) {
1329 tso_fill_packet_with_fragment(txq, &tso);
1330 /* Exactly one DMA descriptor is added */
1331 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0"));
1332 id = (id + 1) & txq->ptr_mask;
1333
1334 /* Move onto the next fragment? */
1335 if (tso.in_len == 0) {
1336 --n_dma_seg;
1337 if (n_dma_seg == 0)
1338 break;
1339 ++dma_seg;
1340 tso.in_len = dma_seg->ds_len;
1341 tso.dma_addr = dma_seg->ds_addr;
1342 }
1343
1344 /* End of packet? */
1345 if ((tso.packet_space == 0) | (tso.segs_space == 0)) {
1346 unsigned int n_fatso_opt_desc =
1347 (tso.fw_assisted & SFXGE_FATSOV2) ?
1348 EFX_TX_FATSOV2_OPT_NDESCS :
1349 (tso.fw_assisted & SFXGE_FATSOV1) ? 1 : 0;
1350
1351 /* If the queue is now full due to tiny MSS,
1352 * or we can't create another header, discard
1353 * the remainder of the input mbuf but do not
1354 * roll back the work we have done.
1355 */
1356 if (txq->n_pend_desc + n_fatso_opt_desc +
1357 1 /* header */ + n_dma_seg > txq->max_pkt_desc) {
1358 txq->tso_pdrop_too_many++;
1359 break;
1360 }
1361 if (__predict_false(tso_start_new_packet(txq, &tso,
1362 &id))) {
1363 txq->tso_pdrop_no_rsrc++;
1364 break;
1365 }
1366 }
1367 }
1368
1369 txq->tso_bursts++;
1370 return (id);
1371 }
1372
1373 static void
1374 sfxge_tx_qunblock(struct sfxge_txq *txq)
1375 {
1376 struct sfxge_softc *sc;
1377 struct sfxge_evq *evq;
1378
1379 sc = txq->sc;
1380 evq = sc->evq[txq->evq_index];
1381
1382 SFXGE_EVQ_LOCK_ASSERT_OWNED(evq);
1383
1384 if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED))
1385 return;
1386
1387 SFXGE_TXQ_LOCK(txq);
1388
1389 if (txq->blocked) {
1390 unsigned int level;
1391
1392 level = txq->added - txq->completed;
1393 if (level <= SFXGE_TXQ_UNBLOCK_LEVEL(txq->entries)) {
1394 /* reaped must be in sync with blocked */
1395 sfxge_tx_qreap(txq);
1396 txq->blocked = 0;
1397 }
1398 }
1399
1400 sfxge_tx_qdpl_service(txq);
1401 /* note: lock has been dropped */
1402 }
1403
1404 void
1405 sfxge_tx_qflush_done(struct sfxge_txq *txq)
1406 {
1407
1408 txq->flush_state = SFXGE_FLUSH_DONE;
1409 }
1410
1411 static void
1412 sfxge_tx_qstop(struct sfxge_softc *sc, unsigned int index)
1413 {
1414 struct sfxge_txq *txq;
1415 struct sfxge_evq *evq;
1416 unsigned int count;
1417
1418 SFXGE_ADAPTER_LOCK_ASSERT_OWNED(sc);
1419
1420 txq = sc->txq[index];
1421 evq = sc->evq[txq->evq_index];
1422
1423 SFXGE_EVQ_LOCK(evq);
1424 SFXGE_TXQ_LOCK(txq);
1425
1426 KASSERT(txq->init_state == SFXGE_TXQ_STARTED,
1427 ("txq->init_state != SFXGE_TXQ_STARTED"));
1428
1429 txq->init_state = SFXGE_TXQ_INITIALIZED;
1430
1431 if (txq->flush_state != SFXGE_FLUSH_DONE) {
1432 txq->flush_state = SFXGE_FLUSH_PENDING;
1433
1434 SFXGE_EVQ_UNLOCK(evq);
1435 SFXGE_TXQ_UNLOCK(txq);
1436
1437 /* Flush the transmit queue. */
1438 if (efx_tx_qflush(txq->common) != 0) {
1439 log(LOG_ERR, "%s: Flushing Tx queue %u failed\n",
1440 device_get_nameunit(sc->dev), index);
1441 txq->flush_state = SFXGE_FLUSH_DONE;
1442 } else {
1443 count = 0;
1444 do {
1445 /* Spin for 100ms. */
1446 DELAY(100000);
1447 if (txq->flush_state != SFXGE_FLUSH_PENDING)
1448 break;
1449 } while (++count < 20);
1450 }
1451 SFXGE_EVQ_LOCK(evq);
1452 SFXGE_TXQ_LOCK(txq);
1453
1454 KASSERT(txq->flush_state != SFXGE_FLUSH_FAILED,
1455 ("txq->flush_state == SFXGE_FLUSH_FAILED"));
1456
1457 if (txq->flush_state != SFXGE_FLUSH_DONE) {
1458 /* Flush timeout */
1459 log(LOG_ERR, "%s: Cannot flush Tx queue %u\n",
1460 device_get_nameunit(sc->dev), index);
1461 txq->flush_state = SFXGE_FLUSH_DONE;
1462 }
1463 }
1464
1465 txq->blocked = 0;
1466 txq->pending = txq->added;
1467
1468 sfxge_tx_qcomplete(txq, evq);
1469 KASSERT(txq->completed == txq->added,
1470 ("txq->completed != txq->added"));
1471
1472 sfxge_tx_qreap(txq);
1473 KASSERT(txq->reaped == txq->completed,
1474 ("txq->reaped != txq->completed"));
1475
1476 txq->added = 0;
1477 txq->pending = 0;
1478 txq->completed = 0;
1479 txq->reaped = 0;
1480
1481 /* Destroy the common code transmit queue. */
1482 efx_tx_qdestroy(txq->common);
1483 txq->common = NULL;
1484
1485 efx_sram_buf_tbl_clear(sc->enp, txq->buf_base_id,
1486 EFX_TXQ_NBUFS(sc->txq_entries));
1487
1488 SFXGE_EVQ_UNLOCK(evq);
1489 SFXGE_TXQ_UNLOCK(txq);
1490 }
1491
1492 /*
1493 * Estimate maximum number of Tx descriptors required for TSO packet.
1494 * With minimum MSS and maximum mbuf length we might need more (even
1495 * than a ring-ful of descriptors), but this should not happen in
1496 * practice except due to deliberate attack. In that case we will
1497 * truncate the output at a packet boundary.
1498 */
1499 static unsigned int
1500 sfxge_tx_max_pkt_desc(const struct sfxge_softc *sc, enum sfxge_txq_type type,
1501 unsigned int tso_fw_assisted)
1502 {
1503 /* One descriptor for every input fragment */
1504 unsigned int max_descs = SFXGE_TX_MAPPING_MAX_SEG;
1505 unsigned int sw_tso_max_descs;
1506 unsigned int fa_tso_v1_max_descs = 0;
1507 unsigned int fa_tso_v2_max_descs = 0;
1508
1509 /* VLAN tagging Tx option descriptor may be required */
1510 if (efx_nic_cfg_get(sc->enp)->enc_hw_tx_insert_vlan_enabled)
1511 max_descs++;
1512
1513 if (type == SFXGE_TXQ_IP_TCP_UDP_CKSUM) {
1514 /*
1515 * Plus header and payload descriptor for each output segment.
1516 * Minus one since header fragment is already counted.
1517 * Even if FATSO is used, we should be ready to fallback
1518 * to do it in the driver.
1519 */
1520 sw_tso_max_descs = SFXGE_TSO_MAX_SEGS * 2 - 1;
1521
1522 /* FW assisted TSOv1 requires one more descriptor per segment
1523 * in comparison to SW TSO */
1524 if (tso_fw_assisted & SFXGE_FATSOV1)
1525 fa_tso_v1_max_descs =
1526 sw_tso_max_descs + SFXGE_TSO_MAX_SEGS;
1527
1528 /* FW assisted TSOv2 requires 3 (2 FATSO plus header) extra
1529 * descriptors per superframe limited by number of DMA fetches
1530 * per packet. The first packet header is already counted.
1531 */
1532 if (tso_fw_assisted & SFXGE_FATSOV2) {
1533 fa_tso_v2_max_descs =
1534 howmany(SFXGE_TX_MAPPING_MAX_SEG,
1535 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1) *
1536 (EFX_TX_FATSOV2_OPT_NDESCS + 1) - 1;
1537 }
1538
1539 max_descs += MAX(sw_tso_max_descs,
1540 MAX(fa_tso_v1_max_descs, fa_tso_v2_max_descs));
1541 }
1542
1543 return (max_descs);
1544 }
1545
1546 static int
1547 sfxge_tx_qstart(struct sfxge_softc *sc, unsigned int index)
1548 {
1549 struct sfxge_txq *txq;
1550 efsys_mem_t *esmp;
1551 uint16_t flags;
1552 unsigned int tso_fw_assisted;
1553 struct sfxge_evq *evq;
1554 unsigned int desc_index;
1555 int rc;
1556
1557 SFXGE_ADAPTER_LOCK_ASSERT_OWNED(sc);
1558
1559 txq = sc->txq[index];
1560 esmp = &txq->mem;
1561 evq = sc->evq[txq->evq_index];
1562
1563 KASSERT(txq->init_state == SFXGE_TXQ_INITIALIZED,
1564 ("txq->init_state != SFXGE_TXQ_INITIALIZED"));
1565 KASSERT(evq->init_state == SFXGE_EVQ_STARTED,
1566 ("evq->init_state != SFXGE_EVQ_STARTED"));
1567
1568 /* Program the buffer table. */
1569 if ((rc = efx_sram_buf_tbl_set(sc->enp, txq->buf_base_id, esmp,
1570 EFX_TXQ_NBUFS(sc->txq_entries))) != 0)
1571 return (rc);
1572
1573 /* Determine the kind of queue we are creating. */
1574 tso_fw_assisted = 0;
1575 switch (txq->type) {
1576 case SFXGE_TXQ_NON_CKSUM:
1577 flags = 0;
1578 break;
1579 case SFXGE_TXQ_IP_CKSUM:
1580 flags = EFX_TXQ_CKSUM_IPV4;
1581 break;
1582 case SFXGE_TXQ_IP_TCP_UDP_CKSUM:
1583 flags = EFX_TXQ_CKSUM_IPV4 | EFX_TXQ_CKSUM_TCPUDP;
1584 tso_fw_assisted = sc->tso_fw_assisted;
1585 if (tso_fw_assisted & SFXGE_FATSOV2)
1586 flags |= EFX_TXQ_FATSOV2;
1587 break;
1588 default:
1589 KASSERT(0, ("Impossible TX queue"));
1590 flags = 0;
1591 break;
1592 }
1593
1594 /* Create the common code transmit queue. */
1595 if ((rc = efx_tx_qcreate(sc->enp, index, txq->type, esmp,
1596 sc->txq_entries, txq->buf_base_id, flags, evq->common,
1597 &txq->common, &desc_index)) != 0) {
1598 /* Retry if no FATSOv2 resources, otherwise fail */
1599 if ((rc != ENOSPC) || (~flags & EFX_TXQ_FATSOV2))
1600 goto fail;
1601
1602 /* Looks like all FATSOv2 contexts are used */
1603 flags &= ~EFX_TXQ_FATSOV2;
1604 tso_fw_assisted &= ~SFXGE_FATSOV2;
1605 if ((rc = efx_tx_qcreate(sc->enp, index, txq->type, esmp,
1606 sc->txq_entries, txq->buf_base_id, flags, evq->common,
1607 &txq->common, &desc_index)) != 0)
1608 goto fail;
1609 }
1610
1611 /* Initialise queue descriptor indexes */
1612 txq->added = txq->pending = txq->completed = txq->reaped = desc_index;
1613
1614 SFXGE_TXQ_LOCK(txq);
1615
1616 /* Enable the transmit queue. */
1617 efx_tx_qenable(txq->common);
1618
1619 txq->init_state = SFXGE_TXQ_STARTED;
1620 txq->flush_state = SFXGE_FLUSH_REQUIRED;
1621 txq->tso_fw_assisted = tso_fw_assisted;
1622
1623 txq->max_pkt_desc = sfxge_tx_max_pkt_desc(sc, txq->type,
1624 tso_fw_assisted);
1625
1626 SFXGE_TXQ_UNLOCK(txq);
1627
1628 return (0);
1629
1630 fail:
1631 efx_sram_buf_tbl_clear(sc->enp, txq->buf_base_id,
1632 EFX_TXQ_NBUFS(sc->txq_entries));
1633 return (rc);
1634 }
1635
1636 void
1637 sfxge_tx_stop(struct sfxge_softc *sc)
1638 {
1639 int index;
1640
1641 index = sc->txq_count;
1642 while (--index >= 0)
1643 sfxge_tx_qstop(sc, index);
1644
1645 /* Tear down the transmit module */
1646 efx_tx_fini(sc->enp);
1647 }
1648
1649 int
1650 sfxge_tx_start(struct sfxge_softc *sc)
1651 {
1652 int index;
1653 int rc;
1654
1655 /* Initialize the common code transmit module. */
1656 if ((rc = efx_tx_init(sc->enp)) != 0)
1657 return (rc);
1658
1659 for (index = 0; index < sc->txq_count; index++) {
1660 if ((rc = sfxge_tx_qstart(sc, index)) != 0)
1661 goto fail;
1662 }
1663
1664 return (0);
1665
1666 fail:
1667 while (--index >= 0)
1668 sfxge_tx_qstop(sc, index);
1669
1670 efx_tx_fini(sc->enp);
1671
1672 return (rc);
1673 }
1674
1675 static int
1676 sfxge_txq_stat_init(struct sfxge_txq *txq, struct sysctl_oid *txq_node)
1677 {
1678 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(txq->sc->dev);
1679 struct sysctl_oid *stat_node;
1680 unsigned int id;
1681
1682 stat_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(txq_node), OID_AUTO,
1683 "stats", CTLFLAG_RD, NULL,
1684 "Tx queue statistics");
1685 if (stat_node == NULL)
1686 return (ENOMEM);
1687
1688 for (id = 0; id < nitems(sfxge_tx_stats); id++) {
1689 SYSCTL_ADD_ULONG(
1690 ctx, SYSCTL_CHILDREN(stat_node), OID_AUTO,
1691 sfxge_tx_stats[id].name, CTLFLAG_RD | CTLFLAG_STATS,
1692 (unsigned long *)((caddr_t)txq + sfxge_tx_stats[id].offset),
1693 "");
1694 }
1695
1696 return (0);
1697 }
1698
1699 /**
1700 * Destroy a transmit queue.
1701 */
1702 static void
1703 sfxge_tx_qfini(struct sfxge_softc *sc, unsigned int index)
1704 {
1705 struct sfxge_txq *txq;
1706 unsigned int nmaps;
1707
1708 txq = sc->txq[index];
1709
1710 KASSERT(txq->init_state == SFXGE_TXQ_INITIALIZED,
1711 ("txq->init_state != SFXGE_TXQ_INITIALIZED"));
1712
1713 if (txq->type == SFXGE_TXQ_IP_TCP_UDP_CKSUM)
1714 tso_fini(txq);
1715
1716 /* Free the context arrays. */
1717 free(txq->pend_desc, M_SFXGE);
1718 nmaps = sc->txq_entries;
1719 while (nmaps-- != 0)
1720 bus_dmamap_destroy(txq->packet_dma_tag, txq->stmp[nmaps].map);
1721 free(txq->stmp, M_SFXGE);
1722
1723 /* Release DMA memory mapping. */
1724 sfxge_dma_free(&txq->mem);
1725
1726 sc->txq[index] = NULL;
1727
1728 SFXGE_TXQ_LOCK_DESTROY(txq);
1729
1730 free(txq, M_SFXGE);
1731 }
1732
1733 static int
1734 sfxge_tx_qinit(struct sfxge_softc *sc, unsigned int txq_index,
1735 enum sfxge_txq_type type, unsigned int evq_index)
1736 {
1737 const efx_nic_cfg_t *encp = efx_nic_cfg_get(sc->enp);
1738 char name[16];
1739 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
1740 struct sysctl_oid *txq_node;
1741 struct sfxge_txq *txq;
1742 struct sfxge_evq *evq;
1743 struct sfxge_tx_dpl *stdp;
1744 struct sysctl_oid *dpl_node;
1745 efsys_mem_t *esmp;
1746 unsigned int nmaps;
1747 int rc;
1748
1749 txq = malloc(sizeof(struct sfxge_txq), M_SFXGE, M_ZERO | M_WAITOK);
1750 txq->sc = sc;
1751 txq->entries = sc->txq_entries;
1752 txq->ptr_mask = txq->entries - 1;
1753
1754 sc->txq[txq_index] = txq;
1755 esmp = &txq->mem;
1756
1757 evq = sc->evq[evq_index];
1758
1759 /* Allocate and zero DMA space for the descriptor ring. */
1760 if ((rc = sfxge_dma_alloc(sc, EFX_TXQ_SIZE(sc->txq_entries), esmp)) != 0)
1761 return (rc);
1762
1763 /* Allocate buffer table entries. */
1764 sfxge_sram_buf_tbl_alloc(sc, EFX_TXQ_NBUFS(sc->txq_entries),
1765 &txq->buf_base_id);
1766
1767 /* Create a DMA tag for packet mappings. */
1768 if (bus_dma_tag_create(sc->parent_dma_tag, 1,
1769 encp->enc_tx_dma_desc_boundary,
1770 MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL,
1771 NULL, 0x11000, SFXGE_TX_MAPPING_MAX_SEG,
1772 encp->enc_tx_dma_desc_size_max, 0, NULL, NULL,
1773 &txq->packet_dma_tag) != 0) {
1774 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n");
1775 rc = ENOMEM;
1776 goto fail;
1777 }
1778
1779 /* Allocate pending descriptor array for batching writes. */
1780 txq->pend_desc = malloc(sizeof(efx_desc_t) * sc->txq_entries,
1781 M_SFXGE, M_ZERO | M_WAITOK);
1782
1783 /* Allocate and initialise mbuf DMA mapping array. */
1784 txq->stmp = malloc(sizeof(struct sfxge_tx_mapping) * sc->txq_entries,
1785 M_SFXGE, M_ZERO | M_WAITOK);
1786 for (nmaps = 0; nmaps < sc->txq_entries; nmaps++) {
1787 rc = bus_dmamap_create(txq->packet_dma_tag, 0,
1788 &txq->stmp[nmaps].map);
1789 if (rc != 0)
1790 goto fail2;
1791 }
1792
1793 snprintf(name, sizeof(name), "%u", txq_index);
1794 txq_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sc->txqs_node),
1795 OID_AUTO, name, CTLFLAG_RD, NULL, "");
1796 if (txq_node == NULL) {
1797 rc = ENOMEM;
1798 goto fail_txq_node;
1799 }
1800
1801 if (type == SFXGE_TXQ_IP_TCP_UDP_CKSUM &&
1802 (rc = tso_init(txq)) != 0)
1803 goto fail3;
1804
1805 /* Initialize the deferred packet list. */
1806 stdp = &txq->dpl;
1807 stdp->std_put_max = sfxge_tx_dpl_put_max;
1808 stdp->std_get_max = sfxge_tx_dpl_get_max;
1809 stdp->std_get_non_tcp_max = sfxge_tx_dpl_get_non_tcp_max;
1810 stdp->std_getp = &stdp->std_get;
1811
1812 SFXGE_TXQ_LOCK_INIT(txq, device_get_nameunit(sc->dev), txq_index);
1813
1814 dpl_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(txq_node), OID_AUTO,
1815 "dpl", CTLFLAG_RD, NULL,
1816 "Deferred packet list statistics");
1817 if (dpl_node == NULL) {
1818 rc = ENOMEM;
1819 goto fail_dpl_node;
1820 }
1821
1822 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO,
1823 "get_count", CTLFLAG_RD | CTLFLAG_STATS,
1824 &stdp->std_get_count, 0, "");
1825 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO,
1826 "get_non_tcp_count", CTLFLAG_RD | CTLFLAG_STATS,
1827 &stdp->std_get_non_tcp_count, 0, "");
1828 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO,
1829 "get_hiwat", CTLFLAG_RD | CTLFLAG_STATS,
1830 &stdp->std_get_hiwat, 0, "");
1831 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO,
1832 "put_hiwat", CTLFLAG_RD | CTLFLAG_STATS,
1833 &stdp->std_put_hiwat, 0, "");
1834
1835 rc = sfxge_txq_stat_init(txq, txq_node);
1836 if (rc != 0)
1837 goto fail_txq_stat_init;
1838
1839 txq->type = type;
1840 txq->evq_index = evq_index;
1841 txq->txq_index = txq_index;
1842 txq->init_state = SFXGE_TXQ_INITIALIZED;
1843 txq->hw_vlan_tci = 0;
1844
1845 return (0);
1846
1847 fail_txq_stat_init:
1848 fail_dpl_node:
1849 fail3:
1850 fail_txq_node:
1851 free(txq->pend_desc, M_SFXGE);
1852 fail2:
1853 while (nmaps-- != 0)
1854 bus_dmamap_destroy(txq->packet_dma_tag, txq->stmp[nmaps].map);
1855 free(txq->stmp, M_SFXGE);
1856 bus_dma_tag_destroy(txq->packet_dma_tag);
1857
1858 fail:
1859 sfxge_dma_free(esmp);
1860
1861 return (rc);
1862 }
1863
1864 static int
1865 sfxge_tx_stat_handler(SYSCTL_HANDLER_ARGS)
1866 {
1867 struct sfxge_softc *sc = arg1;
1868 unsigned int id = arg2;
1869 unsigned long sum;
1870 unsigned int index;
1871
1872 /* Sum across all TX queues */
1873 sum = 0;
1874 for (index = 0; index < sc->txq_count; index++)
1875 sum += *(unsigned long *)((caddr_t)sc->txq[index] +
1876 sfxge_tx_stats[id].offset);
1877
1878 return (SYSCTL_OUT(req, &sum, sizeof(sum)));
1879 }
1880
1881 static void
1882 sfxge_tx_stat_init(struct sfxge_softc *sc)
1883 {
1884 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
1885 struct sysctl_oid_list *stat_list;
1886 unsigned int id;
1887
1888 stat_list = SYSCTL_CHILDREN(sc->stats_node);
1889
1890 for (id = 0; id < nitems(sfxge_tx_stats); id++) {
1891 SYSCTL_ADD_PROC(
1892 ctx, stat_list,
1893 OID_AUTO, sfxge_tx_stats[id].name,
1894 CTLTYPE_ULONG|CTLFLAG_RD,
1895 sc, id, sfxge_tx_stat_handler, "LU",
1896 "");
1897 }
1898 }
1899
1900 uint64_t
1901 sfxge_tx_get_drops(struct sfxge_softc *sc)
1902 {
1903 unsigned int index;
1904 uint64_t drops = 0;
1905 struct sfxge_txq *txq;
1906
1907 /* Sum across all TX queues */
1908 for (index = 0; index < sc->txq_count; index++) {
1909 txq = sc->txq[index];
1910 /*
1911 * In theory, txq->put_overflow and txq->netdown_drops
1912 * should use atomic operation and other should be
1913 * obtained under txq lock, but it is just statistics.
1914 */
1915 drops += txq->drops + txq->get_overflow +
1916 txq->get_non_tcp_overflow +
1917 txq->put_overflow + txq->netdown_drops +
1918 txq->tso_pdrop_too_many + txq->tso_pdrop_no_rsrc;
1919 }
1920 return (drops);
1921 }
1922
1923 void
1924 sfxge_tx_fini(struct sfxge_softc *sc)
1925 {
1926 int index;
1927
1928 index = sc->txq_count;
1929 while (--index >= 0)
1930 sfxge_tx_qfini(sc, index);
1931
1932 sc->txq_count = 0;
1933 }
1934
1935
1936 int
1937 sfxge_tx_init(struct sfxge_softc *sc)
1938 {
1939 const efx_nic_cfg_t *encp = efx_nic_cfg_get(sc->enp);
1940 struct sfxge_intr *intr;
1941 int index;
1942 int rc;
1943
1944 intr = &sc->intr;
1945
1946 KASSERT(intr->state == SFXGE_INTR_INITIALIZED,
1947 ("intr->state != SFXGE_INTR_INITIALIZED"));
1948
1949 if (sfxge_tx_dpl_get_max <= 0) {
1950 log(LOG_ERR, "%s=%d must be greater than 0",
1951 SFXGE_PARAM_TX_DPL_GET_MAX, sfxge_tx_dpl_get_max);
1952 rc = EINVAL;
1953 goto fail_tx_dpl_get_max;
1954 }
1955 if (sfxge_tx_dpl_get_non_tcp_max <= 0) {
1956 log(LOG_ERR, "%s=%d must be greater than 0",
1957 SFXGE_PARAM_TX_DPL_GET_NON_TCP_MAX,
1958 sfxge_tx_dpl_get_non_tcp_max);
1959 rc = EINVAL;
1960 goto fail_tx_dpl_get_non_tcp_max;
1961 }
1962 if (sfxge_tx_dpl_put_max < 0) {
1963 log(LOG_ERR, "%s=%d must be greater or equal to 0",
1964 SFXGE_PARAM_TX_DPL_PUT_MAX, sfxge_tx_dpl_put_max);
1965 rc = EINVAL;
1966 goto fail_tx_dpl_put_max;
1967 }
1968
1969 sc->txq_count = SFXGE_TXQ_NTYPES - 1 + sc->intr.n_alloc;
1970
1971 sc->tso_fw_assisted = sfxge_tso_fw_assisted;
1972 if ((~encp->enc_features & EFX_FEATURE_FW_ASSISTED_TSO) ||
1973 (!encp->enc_fw_assisted_tso_enabled))
1974 sc->tso_fw_assisted &= ~SFXGE_FATSOV1;
1975 if ((~encp->enc_features & EFX_FEATURE_FW_ASSISTED_TSO_V2) ||
1976 (!encp->enc_fw_assisted_tso_v2_enabled))
1977 sc->tso_fw_assisted &= ~SFXGE_FATSOV2;
1978
1979 sc->txqs_node = SYSCTL_ADD_NODE(
1980 device_get_sysctl_ctx(sc->dev),
1981 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)),
1982 OID_AUTO, "txq", CTLFLAG_RD, NULL, "Tx queues");
1983 if (sc->txqs_node == NULL) {
1984 rc = ENOMEM;
1985 goto fail_txq_node;
1986 }
1987
1988 /* Initialize the transmit queues */
1989 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_NON_CKSUM,
1990 SFXGE_TXQ_NON_CKSUM, 0)) != 0)
1991 goto fail;
1992
1993 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_IP_CKSUM,
1994 SFXGE_TXQ_IP_CKSUM, 0)) != 0)
1995 goto fail2;
1996
1997 for (index = 0;
1998 index < sc->txq_count - SFXGE_TXQ_NTYPES + 1;
1999 index++) {
2000 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_NTYPES - 1 + index,
2001 SFXGE_TXQ_IP_TCP_UDP_CKSUM, index)) != 0)
2002 goto fail3;
2003 }
2004
2005 sfxge_tx_stat_init(sc);
2006
2007 return (0);
2008
2009 fail3:
2010 while (--index >= 0)
2011 sfxge_tx_qfini(sc, SFXGE_TXQ_IP_TCP_UDP_CKSUM + index);
2012
2013 sfxge_tx_qfini(sc, SFXGE_TXQ_IP_CKSUM);
2014
2015 fail2:
2016 sfxge_tx_qfini(sc, SFXGE_TXQ_NON_CKSUM);
2017
2018 fail:
2019 fail_txq_node:
2020 sc->txq_count = 0;
2021 fail_tx_dpl_put_max:
2022 fail_tx_dpl_get_non_tcp_max:
2023 fail_tx_dpl_get_max:
2024 return (rc);
2025 }
Cache object: ef8629c591deb6270023e409cdeb974b
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