2 * Copyright (c) 2010-2016 Solarflare Communications Inc.
5 * This software was developed in part by Philip Paeps under contract for
6 * Solarflare Communications, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
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.
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.
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.
34 /* Theory of operation:
36 * Tx queues allocation and mapping
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.
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
49 #include <sys/cdefs.h>
50 __FBSDID("$FreeBSD$");
54 #include <sys/param.h>
55 #include <sys/malloc.h>
58 #include <sys/socket.h>
59 #include <sys/sysctl.h>
60 #include <sys/syslog.h>
61 #include <sys/limits.h>
64 #include <net/ethernet.h>
66 #include <net/if_vlan_var.h>
68 #include <netinet/in.h>
69 #include <netinet/ip.h>
70 #include <netinet/ip6.h>
71 #include <netinet/tcp.h>
74 #include <net/rss_config.h>
77 #include "common/efx.h"
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");
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");
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");
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");
114 static const struct {
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),
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,
143 sfxge_tx_maybe_insert_tag(struct sfxge_txq *txq, struct mbuf *mbuf)
145 uint16_t this_tag = ((mbuf->m_flags & M_VLANTAG) ?
146 mbuf->m_pkthdr.ether_vtag :
149 if (this_tag == txq->hw_vlan_tci)
152 efx_tx_qdesc_vlantci_create(txq->common,
155 txq->n_pend_desc = 1;
156 txq->hw_vlan_tci = this_tag;
161 sfxge_next_stmp(struct sfxge_txq *txq, struct sfxge_tx_mapping **pstmp)
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];
173 sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq)
175 unsigned int completed;
177 SFXGE_EVQ_LOCK_ASSERT_OWNED(evq);
179 completed = txq->completed;
180 while (completed != txq->pending) {
181 struct sfxge_tx_mapping *stmp;
184 id = completed++ & txq->ptr_mask;
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;
195 free(stmp->u.heap_buf, M_SFXGE);
200 txq->completed = completed;
202 /* Check whether we need to unblock the queue. */
207 level = txq->added - txq->completed;
208 if (level <= SFXGE_TXQ_UNBLOCK_LEVEL(txq->entries))
209 sfxge_tx_qunblock(txq);
214 sfxge_is_mbuf_non_tcp(struct mbuf *mbuf)
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.
219 return (!(mbuf->m_pkthdr.csum_flags & (CSUM_IP_TCP | CSUM_IP6_TCP)));
223 * Reorder the put list and append it to the get list.
226 sfxge_tx_qdpl_swizzle(struct sfxge_txq *txq)
228 struct sfxge_tx_dpl *stdp;
229 struct mbuf *mbuf, *get_next, **get_tailp;
230 volatile uintptr_t *putp;
233 unsigned int non_tcp_count;
235 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
239 /* Acquire the put list. */
240 putp = &stdp->std_put;
241 put = atomic_readandclear_ptr(putp);
247 /* Reverse the put list. */
248 get_tailp = &mbuf->m_nextpkt;
254 struct mbuf *put_next;
256 non_tcp_count += sfxge_is_mbuf_non_tcp(mbuf);
257 put_next = mbuf->m_nextpkt;
258 mbuf->m_nextpkt = get_next;
263 } while (mbuf != NULL);
265 if (count > stdp->std_put_hiwat)
266 stdp->std_put_hiwat = count;
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;
277 sfxge_tx_qreap(struct sfxge_txq *txq)
279 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
281 txq->reaped = txq->completed;
285 sfxge_tx_qlist_post(struct sfxge_txq *txq)
287 unsigned int old_added;
288 unsigned int block_level;
292 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
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"));
299 old_added = txq->added;
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"));
306 /* If efx_tx_qdesc_post() had to refragment, our information about
307 * buffers to free may be associated with the wrong
310 KASSERT(txq->added - old_added == txq->n_pend_desc,
311 ("efx_tx_qdesc_post() refragmented descriptors"));
313 level = txq->added - txq->reaped;
314 KASSERT(level <= txq->entries, ("overfilled TX queue"));
316 /* Clear the fragment list. */
317 txq->n_pend_desc = 0;
320 * Set the block level to ensure there is space to generate a
321 * large number of descriptors for TSO.
323 block_level = EFX_TXQ_LIMIT(txq->entries) - txq->max_pkt_desc;
325 /* Have we reached the block level? */
326 if (level < block_level)
329 /* Reap, and check again */
331 level = txq->added - txq->reaped;
332 if (level < block_level)
338 * Avoid a race with completion interrupt handling that could leave
343 level = txq->added - txq->reaped;
344 if (level < block_level) {
350 static int sfxge_tx_queue_mbuf(struct sfxge_txq *txq, struct mbuf *mbuf)
352 bus_dmamap_t *used_map;
354 bus_dma_segment_t dma_seg[SFXGE_TX_MAPPING_MAX_SEG];
356 struct sfxge_tx_mapping *stmp;
364 KASSERT(!txq->blocked, ("txq->blocked"));
366 if (mbuf->m_pkthdr.csum_flags & CSUM_TSO)
367 prefetch_read_many(mbuf->m_data);
369 if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED)) {
374 /* Load the packet for DMA. */
375 id = txq->added & txq->ptr_mask;
376 stmp = &txq->stmp[id];
377 rc = bus_dmamap_load_mbuf_sg(txq->packet_dma_tag, stmp->map,
378 mbuf, dma_seg, &n_dma_seg, 0);
381 struct mbuf *new_mbuf = m_collapse(mbuf, M_NOWAIT,
382 SFXGE_TX_MAPPING_MAX_SEG);
383 if (new_mbuf == NULL)
387 rc = bus_dmamap_load_mbuf_sg(txq->packet_dma_tag,
389 dma_seg, &n_dma_seg, 0);
394 /* Make the packet visible to the hardware. */
395 bus_dmamap_sync(txq->packet_dma_tag, stmp->map, BUS_DMASYNC_PREWRITE);
397 used_map = &stmp->map;
399 vlan_tagged = sfxge_tx_maybe_insert_tag(txq, mbuf);
401 sfxge_next_stmp(txq, &stmp);
403 if (mbuf->m_pkthdr.csum_flags & CSUM_TSO) {
404 rc = sfxge_tx_queue_tso(txq, mbuf, dma_seg, n_dma_seg, vlan_tagged);
407 stmp = &txq->stmp[(rc - 1) & txq->ptr_mask];
409 /* Add the mapping to the fragment list, and set flags
415 desc = &txq->pend_desc[i + vlan_tagged];
416 eop = (i == n_dma_seg - 1);
417 efx_tx_qdesc_dma_create(txq->common,
425 sfxge_next_stmp(txq, &stmp);
427 txq->n_pend_desc = n_dma_seg + vlan_tagged;
431 * If the mapping required more than one descriptor
432 * then we need to associate the DMA map with the last
433 * descriptor, not the first.
435 if (used_map != &stmp->map) {
437 stmp->map = *used_map;
442 stmp->flags = TX_BUF_UNMAP | TX_BUF_MBUF;
444 /* Post the fragment list. */
445 sfxge_tx_qlist_post(txq);
450 bus_dmamap_unload(txq->packet_dma_tag, *used_map);
452 /* Drop the packet on the floor. */
460 * Drain the deferred packet list into the transmit queue.
463 sfxge_tx_qdpl_drain(struct sfxge_txq *txq)
465 struct sfxge_softc *sc;
466 struct sfxge_tx_dpl *stdp;
467 struct mbuf *mbuf, *next;
469 unsigned int non_tcp_count;
473 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
479 if (__predict_true(txq->init_state == SFXGE_TXQ_STARTED)) {
480 prefetch_read_many(sc->enp);
481 prefetch_read_many(txq->common);
484 mbuf = stdp->std_get;
485 count = stdp->std_get_count;
486 non_tcp_count = stdp->std_get_non_tcp_count;
488 if (count > stdp->std_get_hiwat)
489 stdp->std_get_hiwat = count;
492 KASSERT(mbuf != NULL, ("mbuf == NULL"));
494 next = mbuf->m_nextpkt;
495 mbuf->m_nextpkt = NULL;
497 ETHER_BPF_MTAP(sc->ifnet, mbuf); /* packet capture */
500 prefetch_read_many(next);
502 rc = sfxge_tx_queue_mbuf(txq, mbuf);
504 non_tcp_count -= sfxge_is_mbuf_non_tcp(mbuf);
512 /* Push the fragments to the hardware in batches. */
513 if (txq->added - pushed >= SFXGE_TX_BATCH) {
514 efx_tx_qpush(txq->common, txq->added, pushed);
520 KASSERT(mbuf == NULL, ("mbuf != NULL"));
521 KASSERT(non_tcp_count == 0,
522 ("inconsistent TCP/non-TCP detection"));
523 stdp->std_get = NULL;
524 stdp->std_get_count = 0;
525 stdp->std_get_non_tcp_count = 0;
526 stdp->std_getp = &stdp->std_get;
528 stdp->std_get = mbuf;
529 stdp->std_get_count = count;
530 stdp->std_get_non_tcp_count = non_tcp_count;
533 if (txq->added != pushed)
534 efx_tx_qpush(txq->common, txq->added, pushed);
536 KASSERT(txq->blocked || stdp->std_get_count == 0,
537 ("queue unblocked but count is non-zero"));
540 #define SFXGE_TX_QDPL_PENDING(_txq) ((_txq)->dpl.std_put != 0)
543 * Service the deferred packet list.
545 * NOTE: drops the txq mutex!
548 sfxge_tx_qdpl_service(struct sfxge_txq *txq)
550 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
553 if (SFXGE_TX_QDPL_PENDING(txq))
554 sfxge_tx_qdpl_swizzle(txq);
557 sfxge_tx_qdpl_drain(txq);
559 SFXGE_TXQ_UNLOCK(txq);
560 } while (SFXGE_TX_QDPL_PENDING(txq) &&
561 SFXGE_TXQ_TRYLOCK(txq));
565 * Put a packet on the deferred packet get-list.
568 sfxge_tx_qdpl_put_locked(struct sfxge_txq *txq, struct mbuf *mbuf)
570 struct sfxge_tx_dpl *stdp;
574 KASSERT(mbuf->m_nextpkt == NULL, ("mbuf->m_nextpkt != NULL"));
576 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq);
578 if (stdp->std_get_count >= stdp->std_get_max) {
582 if (sfxge_is_mbuf_non_tcp(mbuf)) {
583 if (stdp->std_get_non_tcp_count >=
584 stdp->std_get_non_tcp_max) {
585 txq->get_non_tcp_overflow++;
588 stdp->std_get_non_tcp_count++;
591 *(stdp->std_getp) = mbuf;
592 stdp->std_getp = &mbuf->m_nextpkt;
593 stdp->std_get_count++;
599 * Put a packet on the deferred packet put-list.
601 * We overload the csum_data field in the mbuf to keep track of this length
602 * because there is no cheap alternative to avoid races.
605 sfxge_tx_qdpl_put_unlocked(struct sfxge_txq *txq, struct mbuf *mbuf)
607 struct sfxge_tx_dpl *stdp;
608 volatile uintptr_t *putp;
613 KASSERT(mbuf->m_nextpkt == NULL, ("mbuf->m_nextpkt != NULL"));
615 SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(txq);
618 putp = &stdp->std_put;
619 new = (uintptr_t)mbuf;
624 struct mbuf *mp = (struct mbuf *)old;
625 old_len = mp->m_pkthdr.csum_data;
628 if (old_len >= stdp->std_put_max) {
629 atomic_add_long(&txq->put_overflow, 1);
632 mbuf->m_pkthdr.csum_data = old_len + 1;
633 mbuf->m_nextpkt = (void *)old;
634 } while (atomic_cmpset_ptr(putp, old, new) == 0);
640 * Called from if_transmit - will try to grab the txq lock and enqueue to the
641 * put list if it succeeds, otherwise try to push onto the defer list if space.
644 sfxge_tx_packet_add(struct sfxge_txq *txq, struct mbuf *m)
648 if (!SFXGE_LINK_UP(txq->sc)) {
649 atomic_add_long(&txq->netdown_drops, 1);
654 * Try to grab the txq lock. If we are able to get the lock,
655 * the packet will be appended to the "get list" of the deferred
656 * packet list. Otherwise, it will be pushed on the "put list".
658 if (SFXGE_TXQ_TRYLOCK(txq)) {
659 /* First swizzle put-list to get-list to keep order */
660 sfxge_tx_qdpl_swizzle(txq);
662 rc = sfxge_tx_qdpl_put_locked(txq, m);
664 /* Try to service the list. */
665 sfxge_tx_qdpl_service(txq);
666 /* Lock has been dropped. */
668 rc = sfxge_tx_qdpl_put_unlocked(txq, m);
671 * Try to grab the lock again.
673 * If we are able to get the lock, we need to process
674 * the deferred packet list. If we are not able to get
675 * the lock, another thread is processing the list.
677 if ((rc == 0) && SFXGE_TXQ_TRYLOCK(txq)) {
678 sfxge_tx_qdpl_service(txq);
679 /* Lock has been dropped. */
683 SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(txq);
689 sfxge_tx_qdpl_flush(struct sfxge_txq *txq)
691 struct sfxge_tx_dpl *stdp = &txq->dpl;
692 struct mbuf *mbuf, *next;
696 sfxge_tx_qdpl_swizzle(txq);
697 for (mbuf = stdp->std_get; mbuf != NULL; mbuf = next) {
698 next = mbuf->m_nextpkt;
701 stdp->std_get = NULL;
702 stdp->std_get_count = 0;
703 stdp->std_get_non_tcp_count = 0;
704 stdp->std_getp = &stdp->std_get;
706 SFXGE_TXQ_UNLOCK(txq);
710 sfxge_if_qflush(struct ifnet *ifp)
712 struct sfxge_softc *sc;
717 for (i = 0; i < sc->txq_count; i++)
718 sfxge_tx_qdpl_flush(sc->txq[i]);
721 #if SFXGE_TX_PARSE_EARLY
723 /* There is little space for user data in mbuf pkthdr, so we
724 * use l*hlen fields which are not used by the driver otherwise
725 * to store header offsets.
726 * The fields are 8-bit, but it's ok, no header may be longer than 255 bytes.
730 #define TSO_MBUF_PROTO(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.sixteen[0])
731 /* We abuse l5hlen here because PH_loc can hold only 64 bits of data */
732 #define TSO_MBUF_FLAGS(_mbuf) ((_mbuf)->m_pkthdr.l5hlen)
733 #define TSO_MBUF_PACKETID(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.sixteen[1])
734 #define TSO_MBUF_SEQNUM(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.thirtytwo[1])
736 static void sfxge_parse_tx_packet(struct mbuf *mbuf)
738 struct ether_header *eh = mtod(mbuf, struct ether_header *);
739 const struct tcphdr *th;
740 struct tcphdr th_copy;
742 /* Find network protocol and header */
743 TSO_MBUF_PROTO(mbuf) = eh->ether_type;
744 if (TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_VLAN)) {
745 struct ether_vlan_header *veh =
746 mtod(mbuf, struct ether_vlan_header *);
747 TSO_MBUF_PROTO(mbuf) = veh->evl_proto;
748 mbuf->m_pkthdr.l2hlen = sizeof(*veh);
750 mbuf->m_pkthdr.l2hlen = sizeof(*eh);
753 /* Find TCP header */
754 if (TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_IP)) {
755 const struct ip *iph = (const struct ip *)mtodo(mbuf, mbuf->m_pkthdr.l2hlen);
757 KASSERT(iph->ip_p == IPPROTO_TCP,
758 ("TSO required on non-TCP packet"));
759 mbuf->m_pkthdr.l3hlen = mbuf->m_pkthdr.l2hlen + 4 * iph->ip_hl;
760 TSO_MBUF_PACKETID(mbuf) = iph->ip_id;
762 KASSERT(TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_IPV6),
763 ("TSO required on non-IP packet"));
764 KASSERT(((const struct ip6_hdr *)mtodo(mbuf, mbuf->m_pkthdr.l2hlen))->ip6_nxt ==
766 ("TSO required on non-TCP packet"));
767 mbuf->m_pkthdr.l3hlen = mbuf->m_pkthdr.l2hlen + sizeof(struct ip6_hdr);
768 TSO_MBUF_PACKETID(mbuf) = 0;
771 KASSERT(mbuf->m_len >= mbuf->m_pkthdr.l3hlen,
772 ("network header is fragmented in mbuf"));
774 /* We need TCP header including flags (window is the next) */
775 if (mbuf->m_len < mbuf->m_pkthdr.l3hlen + offsetof(struct tcphdr, th_win)) {
776 m_copydata(mbuf, mbuf->m_pkthdr.l3hlen, sizeof(th_copy),
780 th = (const struct tcphdr *)mtodo(mbuf, mbuf->m_pkthdr.l3hlen);
783 mbuf->m_pkthdr.l4hlen = mbuf->m_pkthdr.l3hlen + 4 * th->th_off;
784 TSO_MBUF_SEQNUM(mbuf) = ntohl(th->th_seq);
786 /* These flags must not be duplicated */
788 * RST should not be duplicated as well, but FreeBSD kernel
789 * generates TSO packets with RST flag. So, do not assert
792 KASSERT(!(th->th_flags & (TH_URG | TH_SYN)),
793 ("incompatible TCP flag 0x%x on TSO packet",
794 th->th_flags & (TH_URG | TH_SYN)));
795 TSO_MBUF_FLAGS(mbuf) = th->th_flags;
800 * TX start -- called by the stack.
803 sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m)
805 struct sfxge_softc *sc;
806 struct sfxge_txq *txq;
809 sc = (struct sfxge_softc *)ifp->if_softc;
812 * Transmit may be called when interface is up from the kernel
813 * point of view, but not yet up (in progress) from the driver
814 * point of view. I.e. link aggregation bring up.
815 * Transmit may be called when interface is up from the driver
816 * point of view, but already down from the kernel point of
817 * view. I.e. Rx when interface shutdown is in progress.
819 KASSERT((ifp->if_flags & IFF_UP) || (sc->if_flags & IFF_UP),
820 ("interface not up"));
822 /* Pick the desired transmit queue. */
823 if (m->m_pkthdr.csum_flags &
824 (CSUM_DELAY_DATA | CSUM_TCP_IPV6 | CSUM_UDP_IPV6 | CSUM_TSO)) {
831 * Select a TX queue which matches the corresponding
832 * RX queue for the hash in order to assign both
833 * TX and RX parts of the flow to the same CPU
835 if (rss_m2bucket(m, &bucket_id) == 0)
836 index = bucket_id % (sc->txq_count - (SFXGE_TXQ_NTYPES - 1));
838 /* check if flowid is set */
839 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
840 uint32_t hash = m->m_pkthdr.flowid;
841 uint32_t idx = hash % nitems(sc->rx_indir_table);
843 index = sc->rx_indir_table[idx];
846 #if SFXGE_TX_PARSE_EARLY
847 if (m->m_pkthdr.csum_flags & CSUM_TSO)
848 sfxge_parse_tx_packet(m);
850 txq = sc->txq[SFXGE_TXQ_IP_TCP_UDP_CKSUM + index];
851 } else if (m->m_pkthdr.csum_flags & CSUM_DELAY_IP) {
852 txq = sc->txq[SFXGE_TXQ_IP_CKSUM];
854 txq = sc->txq[SFXGE_TXQ_NON_CKSUM];
857 rc = sfxge_tx_packet_add(txq, m);
865 * Software "TSO". Not quite as good as doing it in hardware, but
866 * still faster than segmenting in the stack.
869 struct sfxge_tso_state {
870 /* Output position */
871 unsigned out_len; /* Remaining length in current segment */
872 unsigned seqnum; /* Current sequence number */
873 unsigned packet_space; /* Remaining space in current packet */
874 unsigned segs_space; /* Remaining number of DMA segments
875 for the packet (FATSOv2 only) */
878 uint64_t dma_addr; /* DMA address of current position */
879 unsigned in_len; /* Remaining length in current mbuf */
881 const struct mbuf *mbuf; /* Input mbuf (head of chain) */
882 u_short protocol; /* Network protocol (after VLAN decap) */
883 ssize_t nh_off; /* Offset of network header */
884 ssize_t tcph_off; /* Offset of TCP header */
885 unsigned header_len; /* Number of bytes of header */
886 unsigned seg_size; /* TCP segment size */
887 int fw_assisted; /* Use FW-assisted TSO */
888 u_short packet_id; /* IPv4 packet ID from the original packet */
889 uint8_t tcp_flags; /* TCP flags */
890 efx_desc_t header_desc; /* Precomputed header descriptor for
894 #if !SFXGE_TX_PARSE_EARLY
895 static const struct ip *tso_iph(const struct sfxge_tso_state *tso)
897 KASSERT(tso->protocol == htons(ETHERTYPE_IP),
898 ("tso_iph() in non-IPv4 state"));
899 return (const struct ip *)(tso->mbuf->m_data + tso->nh_off);
902 static __unused const struct ip6_hdr *tso_ip6h(const struct sfxge_tso_state *tso)
904 KASSERT(tso->protocol == htons(ETHERTYPE_IPV6),
905 ("tso_ip6h() in non-IPv6 state"));
906 return (const struct ip6_hdr *)(tso->mbuf->m_data + tso->nh_off);
909 static const struct tcphdr *tso_tcph(const struct sfxge_tso_state *tso)
911 return (const struct tcphdr *)(tso->mbuf->m_data + tso->tcph_off);
916 /* Size of preallocated TSO header buffers. Larger blocks must be
917 * allocated from the heap.
919 #define TSOH_STD_SIZE 128
921 /* At most half the descriptors in the queue at any time will refer to
922 * a TSO header buffer, since they must always be followed by a
923 * payload descriptor referring to an mbuf.
925 #define TSOH_COUNT(_txq_entries) ((_txq_entries) / 2u)
926 #define TSOH_PER_PAGE (PAGE_SIZE / TSOH_STD_SIZE)
927 #define TSOH_PAGE_COUNT(_txq_entries) \
928 howmany(TSOH_COUNT(_txq_entries), TSOH_PER_PAGE)
930 static int tso_init(struct sfxge_txq *txq)
932 struct sfxge_softc *sc = txq->sc;
933 unsigned int tsoh_page_count = TSOH_PAGE_COUNT(sc->txq_entries);
936 /* Allocate TSO header buffers */
937 txq->tsoh_buffer = malloc(tsoh_page_count * sizeof(txq->tsoh_buffer[0]),
940 for (i = 0; i < tsoh_page_count; i++) {
941 rc = sfxge_dma_alloc(sc, PAGE_SIZE, &txq->tsoh_buffer[i]);
950 sfxge_dma_free(&txq->tsoh_buffer[i]);
951 free(txq->tsoh_buffer, M_SFXGE);
952 txq->tsoh_buffer = NULL;
956 static void tso_fini(struct sfxge_txq *txq)
960 if (txq->tsoh_buffer != NULL) {
961 for (i = 0; i < TSOH_PAGE_COUNT(txq->sc->txq_entries); i++)
962 sfxge_dma_free(&txq->tsoh_buffer[i]);
963 free(txq->tsoh_buffer, M_SFXGE);
967 static void tso_start(struct sfxge_txq *txq, struct sfxge_tso_state *tso,
968 const bus_dma_segment_t *hdr_dma_seg,
971 const efx_nic_cfg_t *encp = efx_nic_cfg_get(txq->sc->enp);
972 #if !SFXGE_TX_PARSE_EARLY
973 struct ether_header *eh = mtod(mbuf, struct ether_header *);
974 const struct tcphdr *th;
975 struct tcphdr th_copy;
978 tso->fw_assisted = txq->tso_fw_assisted;
981 /* Find network protocol and header */
982 #if !SFXGE_TX_PARSE_EARLY
983 tso->protocol = eh->ether_type;
984 if (tso->protocol == htons(ETHERTYPE_VLAN)) {
985 struct ether_vlan_header *veh =
986 mtod(mbuf, struct ether_vlan_header *);
987 tso->protocol = veh->evl_proto;
988 tso->nh_off = sizeof(*veh);
990 tso->nh_off = sizeof(*eh);
993 tso->protocol = TSO_MBUF_PROTO(mbuf);
994 tso->nh_off = mbuf->m_pkthdr.l2hlen;
995 tso->tcph_off = mbuf->m_pkthdr.l3hlen;
996 tso->packet_id = ntohs(TSO_MBUF_PACKETID(mbuf));
999 #if !SFXGE_TX_PARSE_EARLY
1000 /* Find TCP header */
1001 if (tso->protocol == htons(ETHERTYPE_IP)) {
1002 KASSERT(tso_iph(tso)->ip_p == IPPROTO_TCP,
1003 ("TSO required on non-TCP packet"));
1004 tso->tcph_off = tso->nh_off + 4 * tso_iph(tso)->ip_hl;
1005 tso->packet_id = ntohs(tso_iph(tso)->ip_id);
1007 KASSERT(tso->protocol == htons(ETHERTYPE_IPV6),
1008 ("TSO required on non-IP packet"));
1009 KASSERT(tso_ip6h(tso)->ip6_nxt == IPPROTO_TCP,
1010 ("TSO required on non-TCP packet"));
1011 tso->tcph_off = tso->nh_off + sizeof(struct ip6_hdr);
1017 if (tso->fw_assisted &&
1018 __predict_false(tso->tcph_off >
1019 encp->enc_tx_tso_tcp_header_offset_limit)) {
1020 tso->fw_assisted = 0;
1024 #if !SFXGE_TX_PARSE_EARLY
1025 KASSERT(mbuf->m_len >= tso->tcph_off,
1026 ("network header is fragmented in mbuf"));
1027 /* We need TCP header including flags (window is the next) */
1028 if (mbuf->m_len < tso->tcph_off + offsetof(struct tcphdr, th_win)) {
1029 m_copydata(tso->mbuf, tso->tcph_off, sizeof(th_copy),
1035 tso->header_len = tso->tcph_off + 4 * th->th_off;
1037 tso->header_len = mbuf->m_pkthdr.l4hlen;
1039 tso->seg_size = mbuf->m_pkthdr.tso_segsz;
1041 #if !SFXGE_TX_PARSE_EARLY
1042 tso->seqnum = ntohl(th->th_seq);
1044 /* These flags must not be duplicated */
1046 * RST should not be duplicated as well, but FreeBSD kernel
1047 * generates TSO packets with RST flag. So, do not assert
1050 KASSERT(!(th->th_flags & (TH_URG | TH_SYN)),
1051 ("incompatible TCP flag 0x%x on TSO packet",
1052 th->th_flags & (TH_URG | TH_SYN)));
1053 tso->tcp_flags = th->th_flags;
1055 tso->seqnum = TSO_MBUF_SEQNUM(mbuf);
1056 tso->tcp_flags = TSO_MBUF_FLAGS(mbuf);
1059 tso->out_len = mbuf->m_pkthdr.len - tso->header_len;
1061 if (tso->fw_assisted) {
1062 if (hdr_dma_seg->ds_len >= tso->header_len)
1063 efx_tx_qdesc_dma_create(txq->common,
1064 hdr_dma_seg->ds_addr,
1069 tso->fw_assisted = 0;
1074 * tso_fill_packet_with_fragment - form descriptors for the current fragment
1076 * Form descriptors for the current fragment, until we reach the end
1077 * of fragment or end-of-packet. Return 0 on success, 1 if not enough
1080 static void tso_fill_packet_with_fragment(struct sfxge_txq *txq,
1081 struct sfxge_tso_state *tso)
1085 uint64_t dma_addr = tso->dma_addr;
1088 if (tso->in_len == 0 || tso->packet_space == 0)
1091 KASSERT(tso->in_len > 0, ("TSO input length went negative"));
1092 KASSERT(tso->packet_space > 0, ("TSO packet space went negative"));
1094 if (tso->fw_assisted & SFXGE_FATSOV2) {
1099 if (n < tso->packet_space) {
1100 tso->packet_space -= n;
1103 tso->packet_space = tso->seg_size -
1104 (n - tso->packet_space) % tso->seg_size;
1106 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1 -
1107 (tso->packet_space != tso->seg_size);
1110 n = min(tso->in_len, tso->packet_space);
1111 tso->packet_space -= n;
1118 * It is OK to use binary OR below to avoid extra branching
1119 * since all conditions may always be checked.
1121 eop = (tso->out_len == 0) | (tso->packet_space == 0) |
1122 (tso->segs_space == 0);
1124 desc = &txq->pend_desc[txq->n_pend_desc++];
1125 efx_tx_qdesc_dma_create(txq->common, dma_addr, n, eop, desc);
1128 /* Callback from bus_dmamap_load() for long TSO headers. */
1129 static void tso_map_long_header(void *dma_addr_ret,
1130 bus_dma_segment_t *segs, int nseg,
1133 *(uint64_t *)dma_addr_ret = ((__predict_true(error == 0) &&
1134 __predict_true(nseg == 1)) ?
1139 * tso_start_new_packet - generate a new header and prepare for the new packet
1141 * Generate a new header and prepare for the new packet. Return 0 on
1142 * success, or an error code if failed to alloc header.
1144 static int tso_start_new_packet(struct sfxge_txq *txq,
1145 struct sfxge_tso_state *tso,
1148 unsigned int id = *idp;
1149 struct tcphdr *tsoh_th;
1157 if (tso->fw_assisted) {
1158 if (tso->fw_assisted & SFXGE_FATSOV2) {
1159 /* Add 2 FATSOv2 option descriptors */
1160 desc = &txq->pend_desc[txq->n_pend_desc];
1161 efx_tx_qdesc_tso2_create(txq->common,
1166 EFX_TX_FATSOV2_OPT_NDESCS);
1167 desc += EFX_TX_FATSOV2_OPT_NDESCS;
1168 txq->n_pend_desc += EFX_TX_FATSOV2_OPT_NDESCS;
1169 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0"));
1170 id = (id + EFX_TX_FATSOV2_OPT_NDESCS) & txq->ptr_mask;
1173 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1;
1175 uint8_t tcp_flags = tso->tcp_flags;
1177 if (tso->out_len > tso->seg_size)
1178 tcp_flags &= ~(TH_FIN | TH_PUSH);
1180 /* Add FATSOv1 option descriptor */
1181 desc = &txq->pend_desc[txq->n_pend_desc++];
1182 efx_tx_qdesc_tso_create(txq->common,
1187 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0"));
1188 id = (id + 1) & txq->ptr_mask;
1190 tso->seqnum += tso->seg_size;
1191 tso->segs_space = UINT_MAX;
1194 /* Header DMA descriptor */
1195 *desc = tso->header_desc;
1197 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0"));
1198 id = (id + 1) & txq->ptr_mask;
1200 /* Allocate a DMA-mapped header buffer. */
1201 if (__predict_true(tso->header_len <= TSOH_STD_SIZE)) {
1202 unsigned int page_index = (id / 2) / TSOH_PER_PAGE;
1203 unsigned int buf_index = (id / 2) % TSOH_PER_PAGE;
1205 header = (txq->tsoh_buffer[page_index].esm_base +
1206 buf_index * TSOH_STD_SIZE);
1207 dma_addr = (txq->tsoh_buffer[page_index].esm_addr +
1208 buf_index * TSOH_STD_SIZE);
1209 map = txq->tsoh_buffer[page_index].esm_map;
1211 KASSERT(txq->stmp[id].flags == 0,
1212 ("stmp flags are not 0"));
1214 struct sfxge_tx_mapping *stmp = &txq->stmp[id];
1216 /* We cannot use bus_dmamem_alloc() as that may sleep */
1217 header = malloc(tso->header_len, M_SFXGE, M_NOWAIT);
1218 if (__predict_false(!header))
1220 rc = bus_dmamap_load(txq->packet_dma_tag, stmp->map,
1221 header, tso->header_len,
1222 tso_map_long_header, &dma_addr,
1224 if (__predict_false(dma_addr == 0)) {
1226 /* Succeeded but got >1 segment */
1227 bus_dmamap_unload(txq->packet_dma_tag,
1231 free(header, M_SFXGE);
1236 txq->tso_long_headers++;
1237 stmp->u.heap_buf = header;
1238 stmp->flags = TX_BUF_UNMAP;
1241 tsoh_th = (struct tcphdr *)(header + tso->tcph_off);
1243 /* Copy and update the headers. */
1244 m_copydata(tso->mbuf, 0, tso->header_len, header);
1246 tsoh_th->th_seq = htonl(tso->seqnum);
1247 tso->seqnum += tso->seg_size;
1248 if (tso->out_len > tso->seg_size) {
1249 /* This packet will not finish the TSO burst. */
1250 ip_length = tso->header_len - tso->nh_off + tso->seg_size;
1251 tsoh_th->th_flags &= ~(TH_FIN | TH_PUSH);
1253 /* This packet will be the last in the TSO burst. */
1254 ip_length = tso->header_len - tso->nh_off + tso->out_len;
1257 if (tso->protocol == htons(ETHERTYPE_IP)) {
1258 struct ip *tsoh_iph = (struct ip *)(header + tso->nh_off);
1259 tsoh_iph->ip_len = htons(ip_length);
1260 /* XXX We should increment ip_id, but FreeBSD doesn't
1261 * currently allocate extra IDs for multiple segments.
1264 struct ip6_hdr *tsoh_iph =
1265 (struct ip6_hdr *)(header + tso->nh_off);
1266 tsoh_iph->ip6_plen = htons(ip_length - sizeof(*tsoh_iph));
1269 /* Make the header visible to the hardware. */
1270 bus_dmamap_sync(txq->packet_dma_tag, map, BUS_DMASYNC_PREWRITE);
1272 /* Form a descriptor for this header. */
1273 desc = &txq->pend_desc[txq->n_pend_desc++];
1274 efx_tx_qdesc_dma_create(txq->common,
1279 id = (id + 1) & txq->ptr_mask;
1281 tso->segs_space = UINT_MAX;
1283 tso->packet_space = tso->seg_size;
1291 sfxge_tx_queue_tso(struct sfxge_txq *txq, struct mbuf *mbuf,
1292 const bus_dma_segment_t *dma_seg, int n_dma_seg,
1295 struct sfxge_tso_state tso;
1297 unsigned skipped = 0;
1299 tso_start(txq, &tso, dma_seg, mbuf);
1301 while (dma_seg->ds_len + skipped <= tso.header_len) {
1302 skipped += dma_seg->ds_len;
1304 KASSERT(n_dma_seg, ("no payload found in TSO packet"));
1307 tso.in_len = dma_seg->ds_len - (tso.header_len - skipped);
1308 tso.dma_addr = dma_seg->ds_addr + (tso.header_len - skipped);
1310 id = (txq->added + vlan_tagged) & txq->ptr_mask;
1311 if (__predict_false(tso_start_new_packet(txq, &tso, &id)))
1315 tso_fill_packet_with_fragment(txq, &tso);
1316 /* Exactly one DMA descriptor is added */
1317 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0"));
1318 id = (id + 1) & txq->ptr_mask;
1320 /* Move onto the next fragment? */
1321 if (tso.in_len == 0) {
1326 tso.in_len = dma_seg->ds_len;
1327 tso.dma_addr = dma_seg->ds_addr;
1330 /* End of packet? */
1331 if ((tso.packet_space == 0) | (tso.segs_space == 0)) {
1332 unsigned int n_fatso_opt_desc =
1333 (tso.fw_assisted & SFXGE_FATSOV2) ?
1334 EFX_TX_FATSOV2_OPT_NDESCS :
1335 (tso.fw_assisted & SFXGE_FATSOV1) ? 1 : 0;
1337 /* If the queue is now full due to tiny MSS,
1338 * or we can't create another header, discard
1339 * the remainder of the input mbuf but do not
1340 * roll back the work we have done.
1342 if (txq->n_pend_desc + n_fatso_opt_desc +
1343 1 /* header */ + n_dma_seg > txq->max_pkt_desc) {
1344 txq->tso_pdrop_too_many++;
1347 if (__predict_false(tso_start_new_packet(txq, &tso,
1349 txq->tso_pdrop_no_rsrc++;
1360 sfxge_tx_qunblock(struct sfxge_txq *txq)
1362 struct sfxge_softc *sc;
1363 struct sfxge_evq *evq;
1366 evq = sc->evq[txq->evq_index];
1368 SFXGE_EVQ_LOCK_ASSERT_OWNED(evq);
1370 if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED))
1373 SFXGE_TXQ_LOCK(txq);
1378 level = txq->added - txq->completed;
1379 if (level <= SFXGE_TXQ_UNBLOCK_LEVEL(txq->entries)) {
1380 /* reaped must be in sync with blocked */
1381 sfxge_tx_qreap(txq);
1386 sfxge_tx_qdpl_service(txq);
1387 /* note: lock has been dropped */
1391 sfxge_tx_qflush_done(struct sfxge_txq *txq)
1394 txq->flush_state = SFXGE_FLUSH_DONE;
1398 sfxge_tx_qstop(struct sfxge_softc *sc, unsigned int index)
1400 struct sfxge_txq *txq;
1401 struct sfxge_evq *evq;
1404 SFXGE_ADAPTER_LOCK_ASSERT_OWNED(sc);
1406 txq = sc->txq[index];
1407 evq = sc->evq[txq->evq_index];
1409 SFXGE_EVQ_LOCK(evq);
1410 SFXGE_TXQ_LOCK(txq);
1412 KASSERT(txq->init_state == SFXGE_TXQ_STARTED,
1413 ("txq->init_state != SFXGE_TXQ_STARTED"));
1415 txq->init_state = SFXGE_TXQ_INITIALIZED;
1417 if (txq->flush_state != SFXGE_FLUSH_DONE) {
1418 txq->flush_state = SFXGE_FLUSH_PENDING;
1420 SFXGE_EVQ_UNLOCK(evq);
1421 SFXGE_TXQ_UNLOCK(txq);
1423 /* Flush the transmit queue. */
1424 if (efx_tx_qflush(txq->common) != 0) {
1425 log(LOG_ERR, "%s: Flushing Tx queue %u failed\n",
1426 device_get_nameunit(sc->dev), index);
1427 txq->flush_state = SFXGE_FLUSH_DONE;
1431 /* Spin for 100ms. */
1433 if (txq->flush_state != SFXGE_FLUSH_PENDING)
1435 } while (++count < 20);
1437 SFXGE_EVQ_LOCK(evq);
1438 SFXGE_TXQ_LOCK(txq);
1440 KASSERT(txq->flush_state != SFXGE_FLUSH_FAILED,
1441 ("txq->flush_state == SFXGE_FLUSH_FAILED"));
1443 if (txq->flush_state != SFXGE_FLUSH_DONE) {
1445 log(LOG_ERR, "%s: Cannot flush Tx queue %u\n",
1446 device_get_nameunit(sc->dev), index);
1447 txq->flush_state = SFXGE_FLUSH_DONE;
1452 txq->pending = txq->added;
1454 sfxge_tx_qcomplete(txq, evq);
1455 KASSERT(txq->completed == txq->added,
1456 ("txq->completed != txq->added"));
1458 sfxge_tx_qreap(txq);
1459 KASSERT(txq->reaped == txq->completed,
1460 ("txq->reaped != txq->completed"));
1467 /* Destroy the common code transmit queue. */
1468 efx_tx_qdestroy(txq->common);
1471 efx_sram_buf_tbl_clear(sc->enp, txq->buf_base_id,
1472 EFX_TXQ_NBUFS(sc->txq_entries));
1474 SFXGE_EVQ_UNLOCK(evq);
1475 SFXGE_TXQ_UNLOCK(txq);
1479 * Estimate maximum number of Tx descriptors required for TSO packet.
1480 * With minimum MSS and maximum mbuf length we might need more (even
1481 * than a ring-ful of descriptors), but this should not happen in
1482 * practice except due to deliberate attack. In that case we will
1483 * truncate the output at a packet boundary.
1486 sfxge_tx_max_pkt_desc(const struct sfxge_softc *sc, enum sfxge_txq_type type,
1487 unsigned int tso_fw_assisted)
1489 /* One descriptor for every input fragment */
1490 unsigned int max_descs = SFXGE_TX_MAPPING_MAX_SEG;
1491 unsigned int sw_tso_max_descs;
1492 unsigned int fa_tso_v1_max_descs = 0;
1493 unsigned int fa_tso_v2_max_descs = 0;
1495 /* VLAN tagging Tx option descriptor may be required */
1496 if (efx_nic_cfg_get(sc->enp)->enc_hw_tx_insert_vlan_enabled)
1499 if (type == SFXGE_TXQ_IP_TCP_UDP_CKSUM) {
1501 * Plus header and payload descriptor for each output segment.
1502 * Minus one since header fragment is already counted.
1503 * Even if FATSO is used, we should be ready to fallback
1504 * to do it in the driver.
1506 sw_tso_max_descs = SFXGE_TSO_MAX_SEGS * 2 - 1;
1508 /* FW assisted TSOv1 requires one more descriptor per segment
1509 * in comparison to SW TSO */
1510 if (tso_fw_assisted & SFXGE_FATSOV1)
1511 fa_tso_v1_max_descs =
1512 sw_tso_max_descs + SFXGE_TSO_MAX_SEGS;
1514 /* FW assisted TSOv2 requires 3 (2 FATSO plus header) extra
1515 * descriptors per superframe limited by number of DMA fetches
1516 * per packet. The first packet header is already counted.
1518 if (tso_fw_assisted & SFXGE_FATSOV2) {
1519 fa_tso_v2_max_descs =
1520 howmany(SFXGE_TX_MAPPING_MAX_SEG,
1521 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1) *
1522 (EFX_TX_FATSOV2_OPT_NDESCS + 1) - 1;
1525 max_descs += MAX(sw_tso_max_descs,
1526 MAX(fa_tso_v1_max_descs, fa_tso_v2_max_descs));
1533 sfxge_tx_qstart(struct sfxge_softc *sc, unsigned int index)
1535 struct sfxge_txq *txq;
1538 unsigned int tso_fw_assisted;
1539 struct sfxge_evq *evq;
1540 unsigned int desc_index;
1543 SFXGE_ADAPTER_LOCK_ASSERT_OWNED(sc);
1545 txq = sc->txq[index];
1547 evq = sc->evq[txq->evq_index];
1549 KASSERT(txq->init_state == SFXGE_TXQ_INITIALIZED,
1550 ("txq->init_state != SFXGE_TXQ_INITIALIZED"));
1551 KASSERT(evq->init_state == SFXGE_EVQ_STARTED,
1552 ("evq->init_state != SFXGE_EVQ_STARTED"));
1554 /* Program the buffer table. */
1555 if ((rc = efx_sram_buf_tbl_set(sc->enp, txq->buf_base_id, esmp,
1556 EFX_TXQ_NBUFS(sc->txq_entries))) != 0)
1559 /* Determine the kind of queue we are creating. */
1560 tso_fw_assisted = 0;
1561 switch (txq->type) {
1562 case SFXGE_TXQ_NON_CKSUM:
1565 case SFXGE_TXQ_IP_CKSUM:
1566 flags = EFX_TXQ_CKSUM_IPV4;
1568 case SFXGE_TXQ_IP_TCP_UDP_CKSUM:
1569 flags = EFX_TXQ_CKSUM_IPV4 | EFX_TXQ_CKSUM_TCPUDP;
1570 tso_fw_assisted = sc->tso_fw_assisted;
1571 if (tso_fw_assisted & SFXGE_FATSOV2)
1572 flags |= EFX_TXQ_FATSOV2;
1575 KASSERT(0, ("Impossible TX queue"));
1580 /* Create the common code transmit queue. */
1581 if ((rc = efx_tx_qcreate(sc->enp, index, txq->type, esmp,
1582 sc->txq_entries, txq->buf_base_id, flags, evq->common,
1583 &txq->common, &desc_index)) != 0) {
1584 /* Retry if no FATSOv2 resources, otherwise fail */
1585 if ((rc != ENOSPC) || (~flags & EFX_TXQ_FATSOV2))
1588 /* Looks like all FATSOv2 contexts are used */
1589 flags &= ~EFX_TXQ_FATSOV2;
1590 tso_fw_assisted &= ~SFXGE_FATSOV2;
1591 if ((rc = efx_tx_qcreate(sc->enp, index, txq->type, esmp,
1592 sc->txq_entries, txq->buf_base_id, flags, evq->common,
1593 &txq->common, &desc_index)) != 0)
1597 /* Initialise queue descriptor indexes */
1598 txq->added = txq->pending = txq->completed = txq->reaped = desc_index;
1600 SFXGE_TXQ_LOCK(txq);
1602 /* Enable the transmit queue. */
1603 efx_tx_qenable(txq->common);
1605 txq->init_state = SFXGE_TXQ_STARTED;
1606 txq->flush_state = SFXGE_FLUSH_REQUIRED;
1607 txq->tso_fw_assisted = tso_fw_assisted;
1609 txq->max_pkt_desc = sfxge_tx_max_pkt_desc(sc, txq->type,
1612 SFXGE_TXQ_UNLOCK(txq);
1617 efx_sram_buf_tbl_clear(sc->enp, txq->buf_base_id,
1618 EFX_TXQ_NBUFS(sc->txq_entries));
1623 sfxge_tx_stop(struct sfxge_softc *sc)
1627 index = sc->txq_count;
1628 while (--index >= 0)
1629 sfxge_tx_qstop(sc, index);
1631 /* Tear down the transmit module */
1632 efx_tx_fini(sc->enp);
1636 sfxge_tx_start(struct sfxge_softc *sc)
1641 /* Initialize the common code transmit module. */
1642 if ((rc = efx_tx_init(sc->enp)) != 0)
1645 for (index = 0; index < sc->txq_count; index++) {
1646 if ((rc = sfxge_tx_qstart(sc, index)) != 0)
1653 while (--index >= 0)
1654 sfxge_tx_qstop(sc, index);
1656 efx_tx_fini(sc->enp);
1662 sfxge_txq_stat_init(struct sfxge_txq *txq, struct sysctl_oid *txq_node)
1664 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(txq->sc->dev);
1665 struct sysctl_oid *stat_node;
1668 stat_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(txq_node), OID_AUTO,
1669 "stats", CTLFLAG_RD, NULL,
1670 "Tx queue statistics");
1671 if (stat_node == NULL)
1674 for (id = 0; id < nitems(sfxge_tx_stats); id++) {
1676 ctx, SYSCTL_CHILDREN(stat_node), OID_AUTO,
1677 sfxge_tx_stats[id].name, CTLFLAG_RD | CTLFLAG_STATS,
1678 (unsigned long *)((caddr_t)txq + sfxge_tx_stats[id].offset),
1686 * Destroy a transmit queue.
1689 sfxge_tx_qfini(struct sfxge_softc *sc, unsigned int index)
1691 struct sfxge_txq *txq;
1694 txq = sc->txq[index];
1696 KASSERT(txq->init_state == SFXGE_TXQ_INITIALIZED,
1697 ("txq->init_state != SFXGE_TXQ_INITIALIZED"));
1699 if (txq->type == SFXGE_TXQ_IP_TCP_UDP_CKSUM)
1702 /* Free the context arrays. */
1703 free(txq->pend_desc, M_SFXGE);
1704 nmaps = sc->txq_entries;
1705 while (nmaps-- != 0)
1706 bus_dmamap_destroy(txq->packet_dma_tag, txq->stmp[nmaps].map);
1707 free(txq->stmp, M_SFXGE);
1709 /* Release DMA memory mapping. */
1710 sfxge_dma_free(&txq->mem);
1712 sc->txq[index] = NULL;
1714 SFXGE_TXQ_LOCK_DESTROY(txq);
1720 sfxge_tx_qinit(struct sfxge_softc *sc, unsigned int txq_index,
1721 enum sfxge_txq_type type, unsigned int evq_index)
1724 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
1725 struct sysctl_oid *txq_node;
1726 struct sfxge_txq *txq;
1727 struct sfxge_evq *evq;
1728 struct sfxge_tx_dpl *stdp;
1729 struct sysctl_oid *dpl_node;
1734 txq = malloc(sizeof(struct sfxge_txq), M_SFXGE, M_ZERO | M_WAITOK);
1736 txq->entries = sc->txq_entries;
1737 txq->ptr_mask = txq->entries - 1;
1739 sc->txq[txq_index] = txq;
1742 evq = sc->evq[evq_index];
1744 /* Allocate and zero DMA space for the descriptor ring. */
1745 if ((rc = sfxge_dma_alloc(sc, EFX_TXQ_SIZE(sc->txq_entries), esmp)) != 0)
1748 /* Allocate buffer table entries. */
1749 sfxge_sram_buf_tbl_alloc(sc, EFX_TXQ_NBUFS(sc->txq_entries),
1752 /* Create a DMA tag for packet mappings. */
1753 if (bus_dma_tag_create(sc->parent_dma_tag, 1, 0x1000,
1754 MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL,
1755 NULL, 0x11000, SFXGE_TX_MAPPING_MAX_SEG, 0x1000, 0, NULL, NULL,
1756 &txq->packet_dma_tag) != 0) {
1757 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n");
1762 /* Allocate pending descriptor array for batching writes. */
1763 txq->pend_desc = malloc(sizeof(efx_desc_t) * sc->txq_entries,
1764 M_SFXGE, M_ZERO | M_WAITOK);
1766 /* Allocate and initialise mbuf DMA mapping array. */
1767 txq->stmp = malloc(sizeof(struct sfxge_tx_mapping) * sc->txq_entries,
1768 M_SFXGE, M_ZERO | M_WAITOK);
1769 for (nmaps = 0; nmaps < sc->txq_entries; nmaps++) {
1770 rc = bus_dmamap_create(txq->packet_dma_tag, 0,
1771 &txq->stmp[nmaps].map);
1776 snprintf(name, sizeof(name), "%u", txq_index);
1777 txq_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sc->txqs_node),
1778 OID_AUTO, name, CTLFLAG_RD, NULL, "");
1779 if (txq_node == NULL) {
1784 if (type == SFXGE_TXQ_IP_TCP_UDP_CKSUM &&
1785 (rc = tso_init(txq)) != 0)
1788 if (sfxge_tx_dpl_get_max <= 0) {
1789 log(LOG_ERR, "%s=%d must be greater than 0",
1790 SFXGE_PARAM_TX_DPL_GET_MAX, sfxge_tx_dpl_get_max);
1792 goto fail_tx_dpl_get_max;
1794 if (sfxge_tx_dpl_get_non_tcp_max <= 0) {
1795 log(LOG_ERR, "%s=%d must be greater than 0",
1796 SFXGE_PARAM_TX_DPL_GET_NON_TCP_MAX,
1797 sfxge_tx_dpl_get_non_tcp_max);
1799 goto fail_tx_dpl_get_max;
1801 if (sfxge_tx_dpl_put_max < 0) {
1802 log(LOG_ERR, "%s=%d must be greater or equal to 0",
1803 SFXGE_PARAM_TX_DPL_PUT_MAX, sfxge_tx_dpl_put_max);
1805 goto fail_tx_dpl_put_max;
1808 /* Initialize the deferred packet list. */
1810 stdp->std_put_max = sfxge_tx_dpl_put_max;
1811 stdp->std_get_max = sfxge_tx_dpl_get_max;
1812 stdp->std_get_non_tcp_max = sfxge_tx_dpl_get_non_tcp_max;
1813 stdp->std_getp = &stdp->std_get;
1815 SFXGE_TXQ_LOCK_INIT(txq, device_get_nameunit(sc->dev), txq_index);
1817 dpl_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(txq_node), OID_AUTO,
1818 "dpl", CTLFLAG_RD, NULL,
1819 "Deferred packet list statistics");
1820 if (dpl_node == NULL) {
1825 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO,
1826 "get_count", CTLFLAG_RD | CTLFLAG_STATS,
1827 &stdp->std_get_count, 0, "");
1828 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO,
1829 "get_non_tcp_count", CTLFLAG_RD | CTLFLAG_STATS,
1830 &stdp->std_get_non_tcp_count, 0, "");
1831 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO,
1832 "get_hiwat", CTLFLAG_RD | CTLFLAG_STATS,
1833 &stdp->std_get_hiwat, 0, "");
1834 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO,
1835 "put_hiwat", CTLFLAG_RD | CTLFLAG_STATS,
1836 &stdp->std_put_hiwat, 0, "");
1838 rc = sfxge_txq_stat_init(txq, txq_node);
1840 goto fail_txq_stat_init;
1843 txq->evq_index = evq_index;
1844 txq->txq_index = txq_index;
1845 txq->init_state = SFXGE_TXQ_INITIALIZED;
1846 txq->hw_vlan_tci = 0;
1852 fail_tx_dpl_put_max:
1853 fail_tx_dpl_get_max:
1856 free(txq->pend_desc, M_SFXGE);
1858 while (nmaps-- != 0)
1859 bus_dmamap_destroy(txq->packet_dma_tag, txq->stmp[nmaps].map);
1860 free(txq->stmp, M_SFXGE);
1861 bus_dma_tag_destroy(txq->packet_dma_tag);
1864 sfxge_dma_free(esmp);
1870 sfxge_tx_stat_handler(SYSCTL_HANDLER_ARGS)
1872 struct sfxge_softc *sc = arg1;
1873 unsigned int id = arg2;
1877 /* Sum across all TX queues */
1879 for (index = 0; index < sc->txq_count; index++)
1880 sum += *(unsigned long *)((caddr_t)sc->txq[index] +
1881 sfxge_tx_stats[id].offset);
1883 return (SYSCTL_OUT(req, &sum, sizeof(sum)));
1887 sfxge_tx_stat_init(struct sfxge_softc *sc)
1889 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
1890 struct sysctl_oid_list *stat_list;
1893 stat_list = SYSCTL_CHILDREN(sc->stats_node);
1895 for (id = 0; id < nitems(sfxge_tx_stats); id++) {
1898 OID_AUTO, sfxge_tx_stats[id].name,
1899 CTLTYPE_ULONG|CTLFLAG_RD,
1900 sc, id, sfxge_tx_stat_handler, "LU",
1906 sfxge_tx_get_drops(struct sfxge_softc *sc)
1910 struct sfxge_txq *txq;
1912 /* Sum across all TX queues */
1913 for (index = 0; index < sc->txq_count; index++) {
1914 txq = sc->txq[index];
1916 * In theory, txq->put_overflow and txq->netdown_drops
1917 * should use atomic operation and other should be
1918 * obtained under txq lock, but it is just statistics.
1920 drops += txq->drops + txq->get_overflow +
1921 txq->get_non_tcp_overflow +
1922 txq->put_overflow + txq->netdown_drops +
1923 txq->tso_pdrop_too_many + txq->tso_pdrop_no_rsrc;
1929 sfxge_tx_fini(struct sfxge_softc *sc)
1933 index = sc->txq_count;
1934 while (--index >= 0)
1935 sfxge_tx_qfini(sc, index);
1942 sfxge_tx_init(struct sfxge_softc *sc)
1944 const efx_nic_cfg_t *encp = efx_nic_cfg_get(sc->enp);
1945 struct sfxge_intr *intr;
1951 KASSERT(intr->state == SFXGE_INTR_INITIALIZED,
1952 ("intr->state != SFXGE_INTR_INITIALIZED"));
1954 sc->txq_count = SFXGE_TXQ_NTYPES - 1 + sc->intr.n_alloc;
1956 sc->tso_fw_assisted = sfxge_tso_fw_assisted;
1957 if ((~encp->enc_features & EFX_FEATURE_FW_ASSISTED_TSO) ||
1958 (!encp->enc_fw_assisted_tso_enabled))
1959 sc->tso_fw_assisted &= ~SFXGE_FATSOV1;
1960 if ((~encp->enc_features & EFX_FEATURE_FW_ASSISTED_TSO_V2) ||
1961 (!encp->enc_fw_assisted_tso_v2_enabled))
1962 sc->tso_fw_assisted &= ~SFXGE_FATSOV2;
1964 sc->txqs_node = SYSCTL_ADD_NODE(
1965 device_get_sysctl_ctx(sc->dev),
1966 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)),
1967 OID_AUTO, "txq", CTLFLAG_RD, NULL, "Tx queues");
1968 if (sc->txqs_node == NULL) {
1973 /* Initialize the transmit queues */
1974 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_NON_CKSUM,
1975 SFXGE_TXQ_NON_CKSUM, 0)) != 0)
1978 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_IP_CKSUM,
1979 SFXGE_TXQ_IP_CKSUM, 0)) != 0)
1983 index < sc->txq_count - SFXGE_TXQ_NTYPES + 1;
1985 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_NTYPES - 1 + index,
1986 SFXGE_TXQ_IP_TCP_UDP_CKSUM, index)) != 0)
1990 sfxge_tx_stat_init(sc);
1995 while (--index >= 0)
1996 sfxge_tx_qfini(sc, SFXGE_TXQ_IP_TCP_UDP_CKSUM + index);
1998 sfxge_tx_qfini(sc, SFXGE_TXQ_IP_CKSUM);
2001 sfxge_tx_qfini(sc, SFXGE_TXQ_NON_CKSUM);