4 * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
35 #include "ena_datapath.h"
37 #include "ena_netmap.h"
38 #endif /* DEV_NETMAP */
40 /*********************************************************************
41 * Static functions prototypes
42 *********************************************************************/
44 static int ena_tx_cleanup(struct ena_ring *);
45 static int ena_rx_cleanup(struct ena_ring *);
46 static inline int validate_tx_req_id(struct ena_ring *, uint16_t);
47 static void ena_rx_hash_mbuf(struct ena_ring *, struct ena_com_rx_ctx *,
49 static struct mbuf* ena_rx_mbuf(struct ena_ring *, struct ena_com_rx_buf_info *,
50 struct ena_com_rx_ctx *, uint16_t *);
51 static inline void ena_rx_checksum(struct ena_ring *, struct ena_com_rx_ctx *,
53 static void ena_tx_csum(struct ena_com_tx_ctx *, struct mbuf *, bool);
54 static int ena_check_and_collapse_mbuf(struct ena_ring *tx_ring,
56 static int ena_xmit_mbuf(struct ena_ring *, struct mbuf **);
57 static void ena_start_xmit(struct ena_ring *);
59 /*********************************************************************
61 *********************************************************************/
64 ena_cleanup(void *arg, int pending)
66 struct ena_que *que = arg;
67 struct ena_adapter *adapter = que->adapter;
68 if_t ifp = adapter->ifp;
69 struct ena_ring *tx_ring;
70 struct ena_ring *rx_ring;
71 struct ena_com_io_cq* io_cq;
72 struct ena_eth_io_intr_reg intr_reg;
76 if (unlikely((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0))
79 ena_trace(ENA_DBG, "MSI-X TX/RX routine\n");
81 tx_ring = que->tx_ring;
82 rx_ring = que->rx_ring;
84 ena_qid = ENA_IO_TXQ_IDX(qid);
85 io_cq = &adapter->ena_dev->io_cq_queues[ena_qid];
87 tx_ring->first_interrupt = true;
88 rx_ring->first_interrupt = true;
90 for (i = 0; i < CLEAN_BUDGET; ++i) {
91 rxc = ena_rx_cleanup(rx_ring);
92 txc = ena_tx_cleanup(tx_ring);
94 if (unlikely((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0))
97 if ((txc != TX_BUDGET) && (rxc != RX_BUDGET))
101 /* Signal that work is done and unmask interrupt */
102 ena_com_update_intr_reg(&intr_reg,
106 ena_com_unmask_intr(io_cq, &intr_reg);
110 ena_deferred_mq_start(void *arg, int pending)
112 struct ena_ring *tx_ring = (struct ena_ring *)arg;
113 struct ifnet *ifp = tx_ring->adapter->ifp;
115 while (!drbr_empty(ifp, tx_ring->br) &&
117 (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0) {
118 ENA_RING_MTX_LOCK(tx_ring);
119 ena_start_xmit(tx_ring);
120 ENA_RING_MTX_UNLOCK(tx_ring);
125 ena_mq_start(if_t ifp, struct mbuf *m)
127 struct ena_adapter *adapter = ifp->if_softc;
128 struct ena_ring *tx_ring;
129 int ret, is_drbr_empty;
132 if (unlikely((if_getdrvflags(adapter->ifp) & IFF_DRV_RUNNING) == 0))
135 /* Which queue to use */
137 * If everything is setup correctly, it should be the
138 * same bucket that the current CPU we're on is.
139 * It should improve performance.
141 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
142 i = m->m_pkthdr.flowid % adapter->num_io_queues;
144 i = curcpu % adapter->num_io_queues;
146 tx_ring = &adapter->tx_ring[i];
148 /* Check if drbr is empty before putting packet */
149 is_drbr_empty = drbr_empty(ifp, tx_ring->br);
150 ret = drbr_enqueue(ifp, tx_ring->br, m);
151 if (unlikely(ret != 0)) {
152 taskqueue_enqueue(tx_ring->enqueue_tq, &tx_ring->enqueue_task);
156 if (is_drbr_empty && (ENA_RING_MTX_TRYLOCK(tx_ring) != 0)) {
157 ena_start_xmit(tx_ring);
158 ENA_RING_MTX_UNLOCK(tx_ring);
160 taskqueue_enqueue(tx_ring->enqueue_tq, &tx_ring->enqueue_task);
169 struct ena_adapter *adapter = ifp->if_softc;
170 struct ena_ring *tx_ring = adapter->tx_ring;
173 for(i = 0; i < adapter->num_io_queues; ++i, ++tx_ring)
174 if (!drbr_empty(ifp, tx_ring->br)) {
175 ENA_RING_MTX_LOCK(tx_ring);
176 drbr_flush(ifp, tx_ring->br);
177 ENA_RING_MTX_UNLOCK(tx_ring);
183 /*********************************************************************
185 *********************************************************************/
188 validate_tx_req_id(struct ena_ring *tx_ring, uint16_t req_id)
190 struct ena_adapter *adapter = tx_ring->adapter;
191 struct ena_tx_buffer *tx_info = NULL;
193 if (likely(req_id < tx_ring->ring_size)) {
194 tx_info = &tx_ring->tx_buffer_info[req_id];
195 if (tx_info->mbuf != NULL)
197 device_printf(adapter->pdev,
198 "tx_info doesn't have valid mbuf\n");
201 device_printf(adapter->pdev, "Invalid req_id: %hu\n", req_id);
202 counter_u64_add(tx_ring->tx_stats.bad_req_id, 1);
204 /* Trigger device reset */
205 ena_trigger_reset(adapter, ENA_REGS_RESET_INV_TX_REQ_ID);
211 * ena_tx_cleanup - clear sent packets and corresponding descriptors
212 * @tx_ring: ring for which we want to clean packets
214 * Once packets are sent, we ask the device in a loop for no longer used
215 * descriptors. We find the related mbuf chain in a map (index in an array)
216 * and free it, then update ring state.
217 * This is performed in "endless" loop, updating ring pointers every
218 * TX_COMMIT. The first check of free descriptor is performed before the actual
219 * loop, then repeated at the loop end.
222 ena_tx_cleanup(struct ena_ring *tx_ring)
224 struct ena_adapter *adapter;
225 struct ena_com_io_cq* io_cq;
226 uint16_t next_to_clean;
229 unsigned int total_done = 0;
231 int commit = TX_COMMIT;
232 int budget = TX_BUDGET;
236 adapter = tx_ring->que->adapter;
237 ena_qid = ENA_IO_TXQ_IDX(tx_ring->que->id);
238 io_cq = &adapter->ena_dev->io_cq_queues[ena_qid];
239 next_to_clean = tx_ring->next_to_clean;
242 if (netmap_tx_irq(adapter->ifp, tx_ring->qid) != NM_IRQ_PASS)
244 #endif /* DEV_NETMAP */
247 struct ena_tx_buffer *tx_info;
250 rc = ena_com_tx_comp_req_id_get(io_cq, &req_id);
251 if (unlikely(rc != 0))
254 rc = validate_tx_req_id(tx_ring, req_id);
255 if (unlikely(rc != 0))
258 tx_info = &tx_ring->tx_buffer_info[req_id];
260 mbuf = tx_info->mbuf;
262 tx_info->mbuf = NULL;
263 bintime_clear(&tx_info->timestamp);
265 bus_dmamap_sync(adapter->tx_buf_tag, tx_info->dmamap,
266 BUS_DMASYNC_POSTWRITE);
267 bus_dmamap_unload(adapter->tx_buf_tag,
270 ena_trace(ENA_DBG | ENA_TXPTH, "tx: q %d mbuf %p completed\n",
275 total_done += tx_info->tx_descs;
277 tx_ring->free_tx_ids[next_to_clean] = req_id;
278 next_to_clean = ENA_TX_RING_IDX_NEXT(next_to_clean,
281 if (unlikely(--commit == 0)) {
283 /* update ring state every TX_COMMIT descriptor */
284 tx_ring->next_to_clean = next_to_clean;
286 &adapter->ena_dev->io_sq_queues[ena_qid],
288 ena_com_update_dev_comp_head(io_cq);
291 } while (likely(--budget));
293 work_done = TX_BUDGET - budget;
295 ena_trace(ENA_DBG | ENA_TXPTH, "tx: q %d done. total pkts: %d\n",
296 tx_ring->qid, work_done);
298 /* If there is still something to commit update ring state */
299 if (likely(commit != TX_COMMIT)) {
300 tx_ring->next_to_clean = next_to_clean;
301 ena_com_comp_ack(&adapter->ena_dev->io_sq_queues[ena_qid],
303 ena_com_update_dev_comp_head(io_cq);
307 * Need to make the rings circular update visible to
308 * ena_xmit_mbuf() before checking for tx_ring->running.
312 above_thresh = ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq,
313 ENA_TX_RESUME_THRESH);
314 if (unlikely(!tx_ring->running && above_thresh)) {
315 ENA_RING_MTX_LOCK(tx_ring);
317 ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq,
318 ENA_TX_RESUME_THRESH);
319 if (!tx_ring->running && above_thresh) {
320 tx_ring->running = true;
321 counter_u64_add(tx_ring->tx_stats.queue_wakeup, 1);
322 taskqueue_enqueue(tx_ring->enqueue_tq,
323 &tx_ring->enqueue_task);
325 ENA_RING_MTX_UNLOCK(tx_ring);
332 ena_rx_hash_mbuf(struct ena_ring *rx_ring, struct ena_com_rx_ctx *ena_rx_ctx,
335 struct ena_adapter *adapter = rx_ring->adapter;
337 if (likely(ENA_FLAG_ISSET(ENA_FLAG_RSS_ACTIVE, adapter))) {
338 mbuf->m_pkthdr.flowid = ena_rx_ctx->hash;
342 * Hardware and software RSS are in agreement only when both are
343 * configured to Toeplitz algorithm. This driver configures
344 * that algorithm only when software RSS is enabled and uses it.
346 if (adapter->ena_dev->rss.hash_func != ENA_ADMIN_TOEPLITZ &&
347 ena_rx_ctx->l3_proto != ENA_ETH_IO_L3_PROTO_UNKNOWN) {
348 M_HASHTYPE_SET(mbuf, M_HASHTYPE_OPAQUE_HASH);
353 if (ena_rx_ctx->frag &&
354 (ena_rx_ctx->l3_proto != ENA_ETH_IO_L3_PROTO_UNKNOWN)) {
355 M_HASHTYPE_SET(mbuf, M_HASHTYPE_OPAQUE_HASH);
359 switch (ena_rx_ctx->l3_proto) {
360 case ENA_ETH_IO_L3_PROTO_IPV4:
361 switch (ena_rx_ctx->l4_proto) {
362 case ENA_ETH_IO_L4_PROTO_TCP:
363 M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_TCP_IPV4);
365 case ENA_ETH_IO_L4_PROTO_UDP:
366 M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_UDP_IPV4);
369 M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_IPV4);
372 case ENA_ETH_IO_L3_PROTO_IPV6:
373 switch (ena_rx_ctx->l4_proto) {
374 case ENA_ETH_IO_L4_PROTO_TCP:
375 M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_TCP_IPV6);
377 case ENA_ETH_IO_L4_PROTO_UDP:
378 M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_UDP_IPV6);
381 M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_IPV6);
384 case ENA_ETH_IO_L3_PROTO_UNKNOWN:
385 M_HASHTYPE_SET(mbuf, M_HASHTYPE_NONE);
388 M_HASHTYPE_SET(mbuf, M_HASHTYPE_OPAQUE_HASH);
391 mbuf->m_pkthdr.flowid = rx_ring->qid;
392 M_HASHTYPE_SET(mbuf, M_HASHTYPE_NONE);
397 * ena_rx_mbuf - assemble mbuf from descriptors
398 * @rx_ring: ring for which we want to clean packets
399 * @ena_bufs: buffer info
400 * @ena_rx_ctx: metadata for this packet(s)
401 * @next_to_clean: ring pointer, will be updated only upon success
405 ena_rx_mbuf(struct ena_ring *rx_ring, struct ena_com_rx_buf_info *ena_bufs,
406 struct ena_com_rx_ctx *ena_rx_ctx, uint16_t *next_to_clean)
409 struct ena_rx_buffer *rx_info;
410 struct ena_adapter *adapter;
411 unsigned int descs = ena_rx_ctx->descs;
413 uint16_t ntc, len, req_id, buf = 0;
415 ntc = *next_to_clean;
416 adapter = rx_ring->adapter;
418 len = ena_bufs[buf].len;
419 req_id = ena_bufs[buf].req_id;
420 rc = validate_rx_req_id(rx_ring, req_id);
421 if (unlikely(rc != 0))
424 rx_info = &rx_ring->rx_buffer_info[req_id];
425 if (unlikely(rx_info->mbuf == NULL)) {
426 device_printf(adapter->pdev, "NULL mbuf in rx_info");
430 ena_trace(ENA_DBG | ENA_RXPTH, "rx_info %p, mbuf %p, paddr %jx\n",
431 rx_info, rx_info->mbuf, (uintmax_t)rx_info->ena_buf.paddr);
433 bus_dmamap_sync(adapter->rx_buf_tag, rx_info->map,
434 BUS_DMASYNC_POSTREAD);
435 mbuf = rx_info->mbuf;
436 mbuf->m_flags |= M_PKTHDR;
437 mbuf->m_pkthdr.len = len;
439 mbuf->m_pkthdr.rcvif = rx_ring->que->adapter->ifp;
441 /* Fill mbuf with hash key and it's interpretation for optimization */
442 ena_rx_hash_mbuf(rx_ring, ena_rx_ctx, mbuf);
444 ena_trace(ENA_DBG | ENA_RXPTH, "rx mbuf 0x%p, flags=0x%x, len: %d\n",
445 mbuf, mbuf->m_flags, mbuf->m_pkthdr.len);
447 /* DMA address is not needed anymore, unmap it */
448 bus_dmamap_unload(rx_ring->adapter->rx_buf_tag, rx_info->map);
450 rx_info->mbuf = NULL;
451 rx_ring->free_rx_ids[ntc] = req_id;
452 ntc = ENA_RX_RING_IDX_NEXT(ntc, rx_ring->ring_size);
455 * While we have more than 1 descriptors for one rcvd packet, append
456 * other mbufs to the main one
460 len = ena_bufs[buf].len;
461 req_id = ena_bufs[buf].req_id;
462 rc = validate_rx_req_id(rx_ring, req_id);
463 if (unlikely(rc != 0)) {
465 * If the req_id is invalid, then the device will be
466 * reset. In that case we must free all mbufs that
467 * were already gathered.
472 rx_info = &rx_ring->rx_buffer_info[req_id];
474 if (unlikely(rx_info->mbuf == NULL)) {
475 device_printf(adapter->pdev, "NULL mbuf in rx_info");
477 * If one of the required mbufs was not allocated yet,
478 * we can break there.
479 * All earlier used descriptors will be reallocated
480 * later and not used mbufs can be reused.
481 * The next_to_clean pointer will not be updated in case
482 * of an error, so caller should advance it manually
483 * in error handling routine to keep it up to date
490 bus_dmamap_sync(adapter->rx_buf_tag, rx_info->map,
491 BUS_DMASYNC_POSTREAD);
492 if (unlikely(m_append(mbuf, len, rx_info->mbuf->m_data) == 0)) {
493 counter_u64_add(rx_ring->rx_stats.mbuf_alloc_fail, 1);
494 ena_trace(ENA_WARNING, "Failed to append Rx mbuf %p\n",
498 ena_trace(ENA_DBG | ENA_RXPTH,
499 "rx mbuf updated. len %d\n", mbuf->m_pkthdr.len);
501 /* Free already appended mbuf, it won't be useful anymore */
502 bus_dmamap_unload(rx_ring->adapter->rx_buf_tag, rx_info->map);
503 m_freem(rx_info->mbuf);
504 rx_info->mbuf = NULL;
506 rx_ring->free_rx_ids[ntc] = req_id;
507 ntc = ENA_RX_RING_IDX_NEXT(ntc, rx_ring->ring_size);
510 *next_to_clean = ntc;
516 * ena_rx_checksum - indicate in mbuf if hw indicated a good cksum
519 ena_rx_checksum(struct ena_ring *rx_ring, struct ena_com_rx_ctx *ena_rx_ctx,
523 /* if IP and error */
524 if (unlikely((ena_rx_ctx->l3_proto == ENA_ETH_IO_L3_PROTO_IPV4) &&
525 ena_rx_ctx->l3_csum_err)) {
526 /* ipv4 checksum error */
527 mbuf->m_pkthdr.csum_flags = 0;
528 counter_u64_add(rx_ring->rx_stats.bad_csum, 1);
529 ena_trace(ENA_DBG, "RX IPv4 header checksum error\n");
534 if ((ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_TCP) ||
535 (ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_UDP)) {
536 if (ena_rx_ctx->l4_csum_err) {
537 /* TCP/UDP checksum error */
538 mbuf->m_pkthdr.csum_flags = 0;
539 counter_u64_add(rx_ring->rx_stats.bad_csum, 1);
540 ena_trace(ENA_DBG, "RX L4 checksum error\n");
542 mbuf->m_pkthdr.csum_flags = CSUM_IP_CHECKED;
543 mbuf->m_pkthdr.csum_flags |= CSUM_IP_VALID;
549 * ena_rx_cleanup - handle rx irq
550 * @arg: ring for which irq is being handled
553 ena_rx_cleanup(struct ena_ring *rx_ring)
555 struct ena_adapter *adapter;
557 struct ena_com_rx_ctx ena_rx_ctx;
558 struct ena_com_io_cq* io_cq;
559 struct ena_com_io_sq* io_sq;
562 uint16_t next_to_clean;
563 uint32_t refill_required;
564 uint32_t refill_threshold;
565 uint32_t do_if_input = 0;
568 int budget = RX_BUDGET;
571 #endif /* DEV_NETMAP */
573 adapter = rx_ring->que->adapter;
575 qid = rx_ring->que->id;
576 ena_qid = ENA_IO_RXQ_IDX(qid);
577 io_cq = &adapter->ena_dev->io_cq_queues[ena_qid];
578 io_sq = &adapter->ena_dev->io_sq_queues[ena_qid];
579 next_to_clean = rx_ring->next_to_clean;
582 if (netmap_rx_irq(adapter->ifp, rx_ring->qid, &done) != NM_IRQ_PASS)
584 #endif /* DEV_NETMAP */
586 ena_trace(ENA_DBG, "rx: qid %d\n", qid);
589 ena_rx_ctx.ena_bufs = rx_ring->ena_bufs;
590 ena_rx_ctx.max_bufs = adapter->max_rx_sgl_size;
591 ena_rx_ctx.descs = 0;
592 bus_dmamap_sync(io_cq->cdesc_addr.mem_handle.tag,
593 io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_POSTREAD);
594 rc = ena_com_rx_pkt(io_cq, io_sq, &ena_rx_ctx);
596 if (unlikely(rc != 0))
599 if (unlikely(ena_rx_ctx.descs == 0))
602 ena_trace(ENA_DBG | ENA_RXPTH, "rx: q %d got packet from ena. "
603 "descs #: %d l3 proto %d l4 proto %d hash: %x\n",
604 rx_ring->qid, ena_rx_ctx.descs, ena_rx_ctx.l3_proto,
605 ena_rx_ctx.l4_proto, ena_rx_ctx.hash);
607 /* Receive mbuf from the ring */
608 mbuf = ena_rx_mbuf(rx_ring, rx_ring->ena_bufs,
609 &ena_rx_ctx, &next_to_clean);
610 bus_dmamap_sync(io_cq->cdesc_addr.mem_handle.tag,
611 io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_PREREAD);
612 /* Exit if we failed to retrieve a buffer */
613 if (unlikely(mbuf == NULL)) {
614 for (i = 0; i < ena_rx_ctx.descs; ++i) {
615 rx_ring->free_rx_ids[next_to_clean] =
616 rx_ring->ena_bufs[i].req_id;
618 ENA_RX_RING_IDX_NEXT(next_to_clean,
625 if (((ifp->if_capenable & IFCAP_RXCSUM) != 0) ||
626 ((ifp->if_capenable & IFCAP_RXCSUM_IPV6) != 0)) {
627 ena_rx_checksum(rx_ring, &ena_rx_ctx, mbuf);
631 counter_u64_add_protected(rx_ring->rx_stats.bytes,
633 counter_u64_add_protected(adapter->hw_stats.rx_bytes,
637 * LRO is only for IP/TCP packets and TCP checksum of the packet
638 * should be computed by hardware.
641 if (((ifp->if_capenable & IFCAP_LRO) != 0) &&
642 ((mbuf->m_pkthdr.csum_flags & CSUM_IP_VALID) != 0) &&
643 (ena_rx_ctx.l4_proto == ENA_ETH_IO_L4_PROTO_TCP)) {
645 * Send to the stack if:
646 * - LRO not enabled, or
647 * - no LRO resources, or
648 * - lro enqueue fails
650 if ((rx_ring->lro.lro_cnt != 0) &&
651 (tcp_lro_rx(&rx_ring->lro, mbuf, 0) == 0))
654 if (do_if_input != 0) {
655 ena_trace(ENA_DBG | ENA_RXPTH,
656 "calling if_input() with mbuf %p\n", mbuf);
657 (*ifp->if_input)(ifp, mbuf);
661 counter_u64_add_protected(rx_ring->rx_stats.cnt, 1);
662 counter_u64_add_protected(adapter->hw_stats.rx_packets, 1);
666 rx_ring->next_to_clean = next_to_clean;
668 refill_required = ena_com_free_q_entries(io_sq);
669 refill_threshold = min_t(int,
670 rx_ring->ring_size / ENA_RX_REFILL_THRESH_DIVIDER,
671 ENA_RX_REFILL_THRESH_PACKET);
673 if (refill_required > refill_threshold) {
674 ena_com_update_dev_comp_head(rx_ring->ena_com_io_cq);
675 ena_refill_rx_bufs(rx_ring, refill_required);
678 tcp_lro_flush_all(&rx_ring->lro);
680 return (RX_BUDGET - budget);
683 counter_u64_add(rx_ring->rx_stats.bad_desc_num, 1);
685 /* Too many desc from the device. Trigger reset */
686 ena_trigger_reset(adapter, ENA_REGS_RESET_TOO_MANY_RX_DESCS);
692 ena_tx_csum(struct ena_com_tx_ctx *ena_tx_ctx, struct mbuf *mbuf,
693 bool disable_meta_caching)
695 struct ena_com_tx_meta *ena_meta;
696 struct ether_vlan_header *eh;
697 struct mbuf *mbuf_next;
708 ena_meta = &ena_tx_ctx->ena_meta;
709 mss = mbuf->m_pkthdr.tso_segsz;
714 if ((mbuf->m_pkthdr.csum_flags & CSUM_TSO) != 0)
717 if ((mbuf->m_pkthdr.csum_flags & CSUM_OFFLOAD) != 0)
721 if (disable_meta_caching) {
722 memset(ena_meta, 0, sizeof(*ena_meta));
723 ena_tx_ctx->meta_valid = 1;
725 ena_tx_ctx->meta_valid = 0;
730 /* Determine where frame payload starts. */
731 eh = mtod(mbuf, struct ether_vlan_header *);
732 if (eh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
733 etype = ntohs(eh->evl_proto);
734 ehdrlen = ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN;
736 etype = ntohs(eh->evl_encap_proto);
737 ehdrlen = ETHER_HDR_LEN;
740 mbuf_next = m_getptr(mbuf, ehdrlen, &offset);
741 ip = (struct ip *)(mtodo(mbuf_next, offset));
742 iphlen = ip->ip_hl << 2;
744 mbuf_next = m_getptr(mbuf, iphlen + ehdrlen, &offset);
745 th = (struct tcphdr *)(mtodo(mbuf_next, offset));
747 if ((mbuf->m_pkthdr.csum_flags & CSUM_IP) != 0) {
748 ena_tx_ctx->l3_csum_enable = 1;
750 if ((mbuf->m_pkthdr.csum_flags & CSUM_TSO) != 0) {
751 ena_tx_ctx->tso_enable = 1;
752 ena_meta->l4_hdr_len = (th->th_off);
757 ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV4;
758 if ((ip->ip_off & htons(IP_DF)) != 0)
762 ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV6;
768 if (ip->ip_p == IPPROTO_TCP) {
769 ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_TCP;
770 if ((mbuf->m_pkthdr.csum_flags &
771 (CSUM_IP_TCP | CSUM_IP6_TCP)) != 0)
772 ena_tx_ctx->l4_csum_enable = 1;
774 ena_tx_ctx->l4_csum_enable = 0;
775 } else if (ip->ip_p == IPPROTO_UDP) {
776 ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_UDP;
777 if ((mbuf->m_pkthdr.csum_flags &
778 (CSUM_IP_UDP | CSUM_IP6_UDP)) != 0)
779 ena_tx_ctx->l4_csum_enable = 1;
781 ena_tx_ctx->l4_csum_enable = 0;
783 ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_UNKNOWN;
784 ena_tx_ctx->l4_csum_enable = 0;
788 ena_meta->l3_hdr_len = iphlen;
789 ena_meta->l3_hdr_offset = ehdrlen;
790 ena_tx_ctx->meta_valid = 1;
794 ena_check_and_collapse_mbuf(struct ena_ring *tx_ring, struct mbuf **mbuf)
796 struct ena_adapter *adapter;
797 struct mbuf *collapsed_mbuf;
800 adapter = tx_ring->adapter;
801 num_frags = ena_mbuf_count(*mbuf);
803 /* One segment must be reserved for configuration descriptor. */
804 if (num_frags < adapter->max_tx_sgl_size)
806 counter_u64_add(tx_ring->tx_stats.collapse, 1);
808 collapsed_mbuf = m_collapse(*mbuf, M_NOWAIT,
809 adapter->max_tx_sgl_size - 1);
810 if (unlikely(collapsed_mbuf == NULL)) {
811 counter_u64_add(tx_ring->tx_stats.collapse_err, 1);
815 /* If mbuf was collapsed succesfully, original mbuf is released. */
816 *mbuf = collapsed_mbuf;
822 ena_tx_map_mbuf(struct ena_ring *tx_ring, struct ena_tx_buffer *tx_info,
823 struct mbuf *mbuf, void **push_hdr, u16 *header_len)
825 struct ena_adapter *adapter = tx_ring->adapter;
826 struct ena_com_buf *ena_buf;
827 bus_dma_segment_t segs[ENA_BUS_DMA_SEGS];
829 uint32_t mbuf_head_len;
833 mbuf_head_len = mbuf->m_len;
834 tx_info->mbuf = mbuf;
835 ena_buf = tx_info->bufs;
838 * For easier maintaining of the DMA map, map the whole mbuf even if
839 * the LLQ is used. The descriptors will be filled using the segments.
841 rc = bus_dmamap_load_mbuf_sg(adapter->tx_buf_tag, tx_info->dmamap, mbuf,
842 segs, &nsegs, BUS_DMA_NOWAIT);
843 if (unlikely((rc != 0) || (nsegs == 0))) {
844 ena_trace(ENA_WARNING,
845 "dmamap load failed! err: %d nsegs: %d\n", rc, nsegs);
849 if (tx_ring->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
851 * When the device is LLQ mode, the driver will copy
852 * the header into the device memory space.
853 * the ena_com layer assumes the header is in a linear
855 * This assumption might be wrong since part of the header
856 * can be in the fragmented buffers.
857 * First check if header fits in the mbuf. If not, copy it to
858 * separate buffer that will be holding linearized data.
860 *header_len = min_t(uint32_t, mbuf->m_pkthdr.len, tx_ring->tx_max_header_size);
862 /* If header is in linear space, just point into mbuf's data. */
863 if (likely(*header_len <= mbuf_head_len)) {
864 *push_hdr = mbuf->m_data;
866 * Otherwise, copy whole portion of header from multiple mbufs
867 * to intermediate buffer.
870 m_copydata(mbuf, 0, *header_len, tx_ring->push_buf_intermediate_buf);
871 *push_hdr = tx_ring->push_buf_intermediate_buf;
873 counter_u64_add(tx_ring->tx_stats.llq_buffer_copy, 1);
876 ena_trace(ENA_DBG | ENA_TXPTH,
877 "mbuf: %p header_buf->vaddr: %p push_len: %d\n",
878 mbuf, *push_hdr, *header_len);
880 /* If packet is fitted in LLQ header, no need for DMA segments. */
881 if (mbuf->m_pkthdr.len <= tx_ring->tx_max_header_size) {
884 offset = tx_ring->tx_max_header_size;
886 * As Header part is mapped to LLQ header, we can skip it and just
887 * map the residuum of the mbuf to DMA Segments.
890 if (offset >= segs[iseg].ds_len) {
891 offset -= segs[iseg].ds_len;
893 ena_buf->paddr = segs[iseg].ds_addr + offset;
894 ena_buf->len = segs[iseg].ds_len - offset;
896 tx_info->num_of_bufs++;
905 * header_len is just a hint for the device. Because FreeBSD is not
906 * giving us information about packet header length and it is not
907 * guaranteed that all packet headers will be in the 1st mbuf, setting
908 * header_len to 0 is making the device ignore this value and resolve
909 * header on it's own.
914 /* Map rest of the mbuf */
915 while (iseg < nsegs) {
916 ena_buf->paddr = segs[iseg].ds_addr;
917 ena_buf->len = segs[iseg].ds_len;
920 tx_info->num_of_bufs++;
926 counter_u64_add(tx_ring->tx_stats.dma_mapping_err, 1);
927 tx_info->mbuf = NULL;
932 ena_xmit_mbuf(struct ena_ring *tx_ring, struct mbuf **mbuf)
934 struct ena_adapter *adapter;
935 struct ena_tx_buffer *tx_info;
936 struct ena_com_tx_ctx ena_tx_ctx;
937 struct ena_com_dev *ena_dev;
938 struct ena_com_io_sq* io_sq;
940 uint16_t next_to_use;
947 ena_qid = ENA_IO_TXQ_IDX(tx_ring->que->id);
948 adapter = tx_ring->que->adapter;
949 ena_dev = adapter->ena_dev;
950 io_sq = &ena_dev->io_sq_queues[ena_qid];
952 rc = ena_check_and_collapse_mbuf(tx_ring, mbuf);
953 if (unlikely(rc != 0)) {
954 ena_trace(ENA_WARNING,
955 "Failed to collapse mbuf! err: %d\n", rc);
959 ena_trace(ENA_DBG | ENA_TXPTH, "Tx: %d bytes\n", (*mbuf)->m_pkthdr.len);
961 next_to_use = tx_ring->next_to_use;
962 req_id = tx_ring->free_tx_ids[next_to_use];
963 tx_info = &tx_ring->tx_buffer_info[req_id];
964 tx_info->num_of_bufs = 0;
966 rc = ena_tx_map_mbuf(tx_ring, tx_info, *mbuf, &push_hdr, &header_len);
967 if (unlikely(rc != 0)) {
968 ena_trace(ENA_WARNING, "Failed to map TX mbuf\n");
971 memset(&ena_tx_ctx, 0x0, sizeof(struct ena_com_tx_ctx));
972 ena_tx_ctx.ena_bufs = tx_info->bufs;
973 ena_tx_ctx.push_header = push_hdr;
974 ena_tx_ctx.num_bufs = tx_info->num_of_bufs;
975 ena_tx_ctx.req_id = req_id;
976 ena_tx_ctx.header_len = header_len;
978 /* Set flags and meta data */
979 ena_tx_csum(&ena_tx_ctx, *mbuf, adapter->disable_meta_caching);
981 if (tx_ring->acum_pkts == DB_THRESHOLD ||
982 ena_com_is_doorbell_needed(tx_ring->ena_com_io_sq, &ena_tx_ctx)) {
983 ena_trace(ENA_DBG | ENA_TXPTH,
984 "llq tx max burst size of queue %d achieved, writing doorbell to send burst\n",
986 ena_com_write_sq_doorbell(tx_ring->ena_com_io_sq);
987 counter_u64_add(tx_ring->tx_stats.doorbells, 1);
988 tx_ring->acum_pkts = 0;
991 /* Prepare the packet's descriptors and send them to device */
992 rc = ena_com_prepare_tx(io_sq, &ena_tx_ctx, &nb_hw_desc);
993 if (unlikely(rc != 0)) {
994 if (likely(rc == ENA_COM_NO_MEM)) {
995 ena_trace(ENA_DBG | ENA_TXPTH,
996 "tx ring[%d] if out of space\n", tx_ring->que->id);
998 device_printf(adapter->pdev,
999 "failed to prepare tx bufs\n");
1001 counter_u64_add(tx_ring->tx_stats.prepare_ctx_err, 1);
1006 counter_u64_add_protected(tx_ring->tx_stats.cnt, 1);
1007 counter_u64_add_protected(tx_ring->tx_stats.bytes,
1008 (*mbuf)->m_pkthdr.len);
1010 counter_u64_add_protected(adapter->hw_stats.tx_packets, 1);
1011 counter_u64_add_protected(adapter->hw_stats.tx_bytes,
1012 (*mbuf)->m_pkthdr.len);
1015 tx_info->tx_descs = nb_hw_desc;
1016 getbinuptime(&tx_info->timestamp);
1017 tx_info->print_once = true;
1019 tx_ring->next_to_use = ENA_TX_RING_IDX_NEXT(next_to_use,
1020 tx_ring->ring_size);
1022 /* stop the queue when no more space available, the packet can have up
1023 * to sgl_size + 2. one for the meta descriptor and one for header
1024 * (if the header is larger than tx_max_header_size).
1026 if (unlikely(!ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq,
1027 adapter->max_tx_sgl_size + 2))) {
1028 ena_trace(ENA_DBG | ENA_TXPTH, "Stop queue %d\n",
1031 tx_ring->running = false;
1032 counter_u64_add(tx_ring->tx_stats.queue_stop, 1);
1034 /* There is a rare condition where this function decides to
1035 * stop the queue but meanwhile tx_cleanup() updates
1036 * next_to_completion and terminates.
1037 * The queue will remain stopped forever.
1038 * To solve this issue this function performs mb(), checks
1039 * the wakeup condition and wakes up the queue if needed.
1043 if (ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq,
1044 ENA_TX_RESUME_THRESH)) {
1045 tx_ring->running = true;
1046 counter_u64_add(tx_ring->tx_stats.queue_wakeup, 1);
1050 bus_dmamap_sync(adapter->tx_buf_tag, tx_info->dmamap,
1051 BUS_DMASYNC_PREWRITE);
1056 tx_info->mbuf = NULL;
1057 bus_dmamap_unload(adapter->tx_buf_tag, tx_info->dmamap);
1063 ena_start_xmit(struct ena_ring *tx_ring)
1066 struct ena_adapter *adapter = tx_ring->adapter;
1067 struct ena_com_io_sq* io_sq;
1071 if (unlikely((if_getdrvflags(adapter->ifp) & IFF_DRV_RUNNING) == 0))
1074 if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_LINK_UP, adapter)))
1077 ena_qid = ENA_IO_TXQ_IDX(tx_ring->que->id);
1078 io_sq = &adapter->ena_dev->io_sq_queues[ena_qid];
1080 while ((mbuf = drbr_peek(adapter->ifp, tx_ring->br)) != NULL) {
1081 ena_trace(ENA_DBG | ENA_TXPTH, "\ndequeued mbuf %p with flags %#x and"
1082 " header csum flags %#jx\n",
1083 mbuf, mbuf->m_flags, (uint64_t)mbuf->m_pkthdr.csum_flags);
1085 if (unlikely(!tx_ring->running)) {
1086 drbr_putback(adapter->ifp, tx_ring->br, mbuf);
1090 if (unlikely((ret = ena_xmit_mbuf(tx_ring, &mbuf)) != 0)) {
1091 if (ret == ENA_COM_NO_MEM) {
1092 drbr_putback(adapter->ifp, tx_ring->br, mbuf);
1093 } else if (ret == ENA_COM_NO_SPACE) {
1094 drbr_putback(adapter->ifp, tx_ring->br, mbuf);
1097 drbr_advance(adapter->ifp, tx_ring->br);
1103 drbr_advance(adapter->ifp, tx_ring->br);
1105 if (unlikely((if_getdrvflags(adapter->ifp) &
1106 IFF_DRV_RUNNING) == 0))
1109 tx_ring->acum_pkts++;
1111 BPF_MTAP(adapter->ifp, mbuf);
1114 if (likely(tx_ring->acum_pkts != 0)) {
1115 /* Trigger the dma engine */
1116 ena_com_write_sq_doorbell(io_sq);
1117 counter_u64_add(tx_ring->tx_stats.doorbells, 1);
1118 tx_ring->acum_pkts = 0;
1121 if (unlikely(!tx_ring->running))
1122 taskqueue_enqueue(tx_ring->que->cleanup_tq,
1123 &tx_ring->que->cleanup_task);