Index: head/sys/dev/ena/ena_datapath.c =================================================================== --- head/sys/dev/ena/ena_datapath.c (revision 361528) +++ head/sys/dev/ena/ena_datapath.c (revision 361529) @@ -1,1143 +1,1110 @@ /*- * BSD LICENSE * * Copyright (c) 2015-2019 Amazon.com, Inc. or its affiliates. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include "ena.h" #include "ena_datapath.h" #ifdef DEV_NETMAP #include "ena_netmap.h" #endif /* DEV_NETMAP */ /********************************************************************* * Static functions prototypes *********************************************************************/ static int ena_tx_cleanup(struct ena_ring *); static int ena_rx_cleanup(struct ena_ring *); static inline int validate_tx_req_id(struct ena_ring *, uint16_t); static void ena_rx_hash_mbuf(struct ena_ring *, struct ena_com_rx_ctx *, struct mbuf *); static struct mbuf* ena_rx_mbuf(struct ena_ring *, struct ena_com_rx_buf_info *, struct ena_com_rx_ctx *, uint16_t *); static inline void ena_rx_checksum(struct ena_ring *, struct ena_com_rx_ctx *, struct mbuf *); static void ena_tx_csum(struct ena_com_tx_ctx *, struct mbuf *, bool); static int ena_check_and_collapse_mbuf(struct ena_ring *tx_ring, struct mbuf **mbuf); static int ena_xmit_mbuf(struct ena_ring *, struct mbuf **); static void ena_start_xmit(struct ena_ring *); /********************************************************************* * Global functions *********************************************************************/ void ena_cleanup(void *arg, int pending) { struct ena_que *que = arg; struct ena_adapter *adapter = que->adapter; if_t ifp = adapter->ifp; struct ena_ring *tx_ring; struct ena_ring *rx_ring; struct ena_com_io_cq* io_cq; struct ena_eth_io_intr_reg intr_reg; int qid, ena_qid; int txc, rxc, i; if (unlikely((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0)) return; ena_trace(ENA_DBG, "MSI-X TX/RX routine\n"); tx_ring = que->tx_ring; rx_ring = que->rx_ring; qid = que->id; ena_qid = ENA_IO_TXQ_IDX(qid); io_cq = &adapter->ena_dev->io_cq_queues[ena_qid]; tx_ring->first_interrupt = true; rx_ring->first_interrupt = true; for (i = 0; i < CLEAN_BUDGET; ++i) { rxc = ena_rx_cleanup(rx_ring); txc = ena_tx_cleanup(tx_ring); if (unlikely((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0)) return; if ((txc != TX_BUDGET) && (rxc != RX_BUDGET)) break; } /* Signal that work is done and unmask interrupt */ ena_com_update_intr_reg(&intr_reg, RX_IRQ_INTERVAL, TX_IRQ_INTERVAL, true); ena_com_unmask_intr(io_cq, &intr_reg); } void ena_deferred_mq_start(void *arg, int pending) { struct ena_ring *tx_ring = (struct ena_ring *)arg; struct ifnet *ifp = tx_ring->adapter->ifp; while (!drbr_empty(ifp, tx_ring->br) && tx_ring->running && (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0) { ENA_RING_MTX_LOCK(tx_ring); ena_start_xmit(tx_ring); ENA_RING_MTX_UNLOCK(tx_ring); } } int ena_mq_start(if_t ifp, struct mbuf *m) { struct ena_adapter *adapter = ifp->if_softc; struct ena_ring *tx_ring; int ret, is_drbr_empty; uint32_t i; if (unlikely((if_getdrvflags(adapter->ifp) & IFF_DRV_RUNNING) == 0)) return (ENODEV); /* Which queue to use */ /* * If everything is setup correctly, it should be the * same bucket that the current CPU we're on is. * It should improve performance. */ if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { i = m->m_pkthdr.flowid % adapter->num_io_queues; } else { i = curcpu % adapter->num_io_queues; } tx_ring = &adapter->tx_ring[i]; /* Check if drbr is empty before putting packet */ is_drbr_empty = drbr_empty(ifp, tx_ring->br); ret = drbr_enqueue(ifp, tx_ring->br, m); if (unlikely(ret != 0)) { taskqueue_enqueue(tx_ring->enqueue_tq, &tx_ring->enqueue_task); return (ret); } if (is_drbr_empty && (ENA_RING_MTX_TRYLOCK(tx_ring) != 0)) { ena_start_xmit(tx_ring); ENA_RING_MTX_UNLOCK(tx_ring); } else { taskqueue_enqueue(tx_ring->enqueue_tq, &tx_ring->enqueue_task); } return (0); } void ena_qflush(if_t ifp) { struct ena_adapter *adapter = ifp->if_softc; struct ena_ring *tx_ring = adapter->tx_ring; int i; for(i = 0; i < adapter->num_io_queues; ++i, ++tx_ring) if (!drbr_empty(ifp, tx_ring->br)) { ENA_RING_MTX_LOCK(tx_ring); drbr_flush(ifp, tx_ring->br); ENA_RING_MTX_UNLOCK(tx_ring); } if_qflush(ifp); } /********************************************************************* * Static functions *********************************************************************/ static inline int validate_tx_req_id(struct ena_ring *tx_ring, uint16_t req_id) { struct ena_adapter *adapter = tx_ring->adapter; struct ena_tx_buffer *tx_info = NULL; if (likely(req_id < tx_ring->ring_size)) { tx_info = &tx_ring->tx_buffer_info[req_id]; if (tx_info->mbuf != NULL) return (0); device_printf(adapter->pdev, "tx_info doesn't have valid mbuf\n"); } device_printf(adapter->pdev, "Invalid req_id: %hu\n", req_id); counter_u64_add(tx_ring->tx_stats.bad_req_id, 1); /* Trigger device reset */ ena_trigger_reset(adapter, ENA_REGS_RESET_INV_TX_REQ_ID); return (EFAULT); } /** * ena_tx_cleanup - clear sent packets and corresponding descriptors * @tx_ring: ring for which we want to clean packets * * Once packets are sent, we ask the device in a loop for no longer used * descriptors. We find the related mbuf chain in a map (index in an array) * and free it, then update ring state. * This is performed in "endless" loop, updating ring pointers every * TX_COMMIT. The first check of free descriptor is performed before the actual * loop, then repeated at the loop end. **/ static int ena_tx_cleanup(struct ena_ring *tx_ring) { struct ena_adapter *adapter; struct ena_com_io_cq* io_cq; uint16_t next_to_clean; uint16_t req_id; uint16_t ena_qid; unsigned int total_done = 0; int rc; int commit = TX_COMMIT; int budget = TX_BUDGET; int work_done; bool above_thresh; adapter = tx_ring->que->adapter; ena_qid = ENA_IO_TXQ_IDX(tx_ring->que->id); io_cq = &adapter->ena_dev->io_cq_queues[ena_qid]; next_to_clean = tx_ring->next_to_clean; #ifdef DEV_NETMAP if (netmap_tx_irq(adapter->ifp, tx_ring->qid) != NM_IRQ_PASS) return (0); #endif /* DEV_NETMAP */ do { struct ena_tx_buffer *tx_info; struct mbuf *mbuf; rc = ena_com_tx_comp_req_id_get(io_cq, &req_id); if (unlikely(rc != 0)) break; rc = validate_tx_req_id(tx_ring, req_id); if (unlikely(rc != 0)) break; tx_info = &tx_ring->tx_buffer_info[req_id]; mbuf = tx_info->mbuf; tx_info->mbuf = NULL; bintime_clear(&tx_info->timestamp); bus_dmamap_sync(adapter->tx_buf_tag, tx_info->dmamap, BUS_DMASYNC_POSTWRITE); bus_dmamap_unload(adapter->tx_buf_tag, tx_info->dmamap); ena_trace(ENA_DBG | ENA_TXPTH, "tx: q %d mbuf %p completed\n", tx_ring->qid, mbuf); m_freem(mbuf); total_done += tx_info->tx_descs; tx_ring->free_tx_ids[next_to_clean] = req_id; next_to_clean = ENA_TX_RING_IDX_NEXT(next_to_clean, tx_ring->ring_size); if (unlikely(--commit == 0)) { commit = TX_COMMIT; /* update ring state every TX_COMMIT descriptor */ tx_ring->next_to_clean = next_to_clean; ena_com_comp_ack( &adapter->ena_dev->io_sq_queues[ena_qid], total_done); ena_com_update_dev_comp_head(io_cq); total_done = 0; } } while (likely(--budget)); work_done = TX_BUDGET - budget; ena_trace(ENA_DBG | ENA_TXPTH, "tx: q %d done. total pkts: %d\n", tx_ring->qid, work_done); /* If there is still something to commit update ring state */ if (likely(commit != TX_COMMIT)) { tx_ring->next_to_clean = next_to_clean; ena_com_comp_ack(&adapter->ena_dev->io_sq_queues[ena_qid], total_done); ena_com_update_dev_comp_head(io_cq); } /* * Need to make the rings circular update visible to * ena_xmit_mbuf() before checking for tx_ring->running. */ mb(); above_thresh = ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq, ENA_TX_RESUME_THRESH); if (unlikely(!tx_ring->running && above_thresh)) { ENA_RING_MTX_LOCK(tx_ring); above_thresh = ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq, ENA_TX_RESUME_THRESH); if (!tx_ring->running && above_thresh) { tx_ring->running = true; counter_u64_add(tx_ring->tx_stats.queue_wakeup, 1); taskqueue_enqueue(tx_ring->enqueue_tq, &tx_ring->enqueue_task); } ENA_RING_MTX_UNLOCK(tx_ring); } return (work_done); } static void ena_rx_hash_mbuf(struct ena_ring *rx_ring, struct ena_com_rx_ctx *ena_rx_ctx, struct mbuf *mbuf) { struct ena_adapter *adapter = rx_ring->adapter; if (likely(ENA_FLAG_ISSET(ENA_FLAG_RSS_ACTIVE, adapter))) { mbuf->m_pkthdr.flowid = ena_rx_ctx->hash; if (ena_rx_ctx->frag && (ena_rx_ctx->l3_proto != ENA_ETH_IO_L3_PROTO_UNKNOWN)) { M_HASHTYPE_SET(mbuf, M_HASHTYPE_OPAQUE_HASH); return; } switch (ena_rx_ctx->l3_proto) { case ENA_ETH_IO_L3_PROTO_IPV4: switch (ena_rx_ctx->l4_proto) { case ENA_ETH_IO_L4_PROTO_TCP: M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_TCP_IPV4); break; case ENA_ETH_IO_L4_PROTO_UDP: M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_UDP_IPV4); break; default: M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_IPV4); } break; case ENA_ETH_IO_L3_PROTO_IPV6: switch (ena_rx_ctx->l4_proto) { case ENA_ETH_IO_L4_PROTO_TCP: M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_TCP_IPV6); break; case ENA_ETH_IO_L4_PROTO_UDP: M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_UDP_IPV6); break; default: M_HASHTYPE_SET(mbuf, M_HASHTYPE_RSS_IPV6); } break; case ENA_ETH_IO_L3_PROTO_UNKNOWN: M_HASHTYPE_SET(mbuf, M_HASHTYPE_NONE); break; default: M_HASHTYPE_SET(mbuf, M_HASHTYPE_OPAQUE_HASH); } } else { mbuf->m_pkthdr.flowid = rx_ring->qid; M_HASHTYPE_SET(mbuf, M_HASHTYPE_NONE); } } /** * ena_rx_mbuf - assemble mbuf from descriptors * @rx_ring: ring for which we want to clean packets * @ena_bufs: buffer info * @ena_rx_ctx: metadata for this packet(s) * @next_to_clean: ring pointer, will be updated only upon success * **/ static struct mbuf* ena_rx_mbuf(struct ena_ring *rx_ring, struct ena_com_rx_buf_info *ena_bufs, struct ena_com_rx_ctx *ena_rx_ctx, uint16_t *next_to_clean) { struct mbuf *mbuf; struct ena_rx_buffer *rx_info; struct ena_adapter *adapter; unsigned int descs = ena_rx_ctx->descs; int rc; uint16_t ntc, len, req_id, buf = 0; ntc = *next_to_clean; adapter = rx_ring->adapter; len = ena_bufs[buf].len; req_id = ena_bufs[buf].req_id; rc = validate_rx_req_id(rx_ring, req_id); if (unlikely(rc != 0)) return (NULL); rx_info = &rx_ring->rx_buffer_info[req_id]; if (unlikely(rx_info->mbuf == NULL)) { device_printf(adapter->pdev, "NULL mbuf in rx_info"); return (NULL); } ena_trace(ENA_DBG | ENA_RXPTH, "rx_info %p, mbuf %p, paddr %jx\n", rx_info, rx_info->mbuf, (uintmax_t)rx_info->ena_buf.paddr); bus_dmamap_sync(adapter->rx_buf_tag, rx_info->map, BUS_DMASYNC_POSTREAD); mbuf = rx_info->mbuf; mbuf->m_flags |= M_PKTHDR; mbuf->m_pkthdr.len = len; mbuf->m_len = len; mbuf->m_pkthdr.rcvif = rx_ring->que->adapter->ifp; /* Fill mbuf with hash key and it's interpretation for optimization */ ena_rx_hash_mbuf(rx_ring, ena_rx_ctx, mbuf); ena_trace(ENA_DBG | ENA_RXPTH, "rx mbuf 0x%p, flags=0x%x, len: %d\n", mbuf, mbuf->m_flags, mbuf->m_pkthdr.len); /* DMA address is not needed anymore, unmap it */ bus_dmamap_unload(rx_ring->adapter->rx_buf_tag, rx_info->map); rx_info->mbuf = NULL; rx_ring->free_rx_ids[ntc] = req_id; ntc = ENA_RX_RING_IDX_NEXT(ntc, rx_ring->ring_size); /* * While we have more than 1 descriptors for one rcvd packet, append * other mbufs to the main one */ while (--descs) { ++buf; len = ena_bufs[buf].len; req_id = ena_bufs[buf].req_id; rc = validate_rx_req_id(rx_ring, req_id); if (unlikely(rc != 0)) { /* * If the req_id is invalid, then the device will be * reset. In that case we must free all mbufs that * were already gathered. */ m_freem(mbuf); return (NULL); } rx_info = &rx_ring->rx_buffer_info[req_id]; if (unlikely(rx_info->mbuf == NULL)) { device_printf(adapter->pdev, "NULL mbuf in rx_info"); /* * If one of the required mbufs was not allocated yet, * we can break there. * All earlier used descriptors will be reallocated * later and not used mbufs can be reused. * The next_to_clean pointer will not be updated in case * of an error, so caller should advance it manually * in error handling routine to keep it up to date * with hw ring. */ m_freem(mbuf); return (NULL); } bus_dmamap_sync(adapter->rx_buf_tag, rx_info->map, BUS_DMASYNC_POSTREAD); if (unlikely(m_append(mbuf, len, rx_info->mbuf->m_data) == 0)) { counter_u64_add(rx_ring->rx_stats.mbuf_alloc_fail, 1); ena_trace(ENA_WARNING, "Failed to append Rx mbuf %p\n", mbuf); } ena_trace(ENA_DBG | ENA_RXPTH, "rx mbuf updated. len %d\n", mbuf->m_pkthdr.len); /* Free already appended mbuf, it won't be useful anymore */ bus_dmamap_unload(rx_ring->adapter->rx_buf_tag, rx_info->map); m_freem(rx_info->mbuf); rx_info->mbuf = NULL; rx_ring->free_rx_ids[ntc] = req_id; ntc = ENA_RX_RING_IDX_NEXT(ntc, rx_ring->ring_size); } *next_to_clean = ntc; return (mbuf); } /** * ena_rx_checksum - indicate in mbuf if hw indicated a good cksum **/ static inline void ena_rx_checksum(struct ena_ring *rx_ring, struct ena_com_rx_ctx *ena_rx_ctx, struct mbuf *mbuf) { /* if IP and error */ if (unlikely((ena_rx_ctx->l3_proto == ENA_ETH_IO_L3_PROTO_IPV4) && ena_rx_ctx->l3_csum_err)) { /* ipv4 checksum error */ mbuf->m_pkthdr.csum_flags = 0; counter_u64_add(rx_ring->rx_stats.bad_csum, 1); ena_trace(ENA_DBG, "RX IPv4 header checksum error\n"); return; } /* if TCP/UDP */ if ((ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_TCP) || (ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_UDP)) { if (ena_rx_ctx->l4_csum_err) { /* TCP/UDP checksum error */ mbuf->m_pkthdr.csum_flags = 0; counter_u64_add(rx_ring->rx_stats.bad_csum, 1); ena_trace(ENA_DBG, "RX L4 checksum error\n"); } else { mbuf->m_pkthdr.csum_flags = CSUM_IP_CHECKED; mbuf->m_pkthdr.csum_flags |= CSUM_IP_VALID; } } } /** * ena_rx_cleanup - handle rx irq * @arg: ring for which irq is being handled **/ static int ena_rx_cleanup(struct ena_ring *rx_ring) { struct ena_adapter *adapter; struct mbuf *mbuf; struct ena_com_rx_ctx ena_rx_ctx; struct ena_com_io_cq* io_cq; struct ena_com_io_sq* io_sq; if_t ifp; uint16_t ena_qid; uint16_t next_to_clean; uint32_t refill_required; uint32_t refill_threshold; uint32_t do_if_input = 0; unsigned int qid; int rc, i; int budget = RX_BUDGET; #ifdef DEV_NETMAP int done; #endif /* DEV_NETMAP */ adapter = rx_ring->que->adapter; ifp = adapter->ifp; qid = rx_ring->que->id; ena_qid = ENA_IO_RXQ_IDX(qid); io_cq = &adapter->ena_dev->io_cq_queues[ena_qid]; io_sq = &adapter->ena_dev->io_sq_queues[ena_qid]; next_to_clean = rx_ring->next_to_clean; #ifdef DEV_NETMAP if (netmap_rx_irq(adapter->ifp, rx_ring->qid, &done) != NM_IRQ_PASS) return (0); #endif /* DEV_NETMAP */ ena_trace(ENA_DBG, "rx: qid %d\n", qid); do { ena_rx_ctx.ena_bufs = rx_ring->ena_bufs; ena_rx_ctx.max_bufs = adapter->max_rx_sgl_size; ena_rx_ctx.descs = 0; bus_dmamap_sync(io_cq->cdesc_addr.mem_handle.tag, io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_POSTREAD); rc = ena_com_rx_pkt(io_cq, io_sq, &ena_rx_ctx); if (unlikely(rc != 0)) goto error; if (unlikely(ena_rx_ctx.descs == 0)) break; ena_trace(ENA_DBG | ENA_RXPTH, "rx: q %d got packet from ena. " "descs #: %d l3 proto %d l4 proto %d hash: %x\n", rx_ring->qid, ena_rx_ctx.descs, ena_rx_ctx.l3_proto, ena_rx_ctx.l4_proto, ena_rx_ctx.hash); /* Receive mbuf from the ring */ mbuf = ena_rx_mbuf(rx_ring, rx_ring->ena_bufs, &ena_rx_ctx, &next_to_clean); bus_dmamap_sync(io_cq->cdesc_addr.mem_handle.tag, io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_PREREAD); /* Exit if we failed to retrieve a buffer */ if (unlikely(mbuf == NULL)) { for (i = 0; i < ena_rx_ctx.descs; ++i) { rx_ring->free_rx_ids[next_to_clean] = rx_ring->ena_bufs[i].req_id; next_to_clean = ENA_RX_RING_IDX_NEXT(next_to_clean, rx_ring->ring_size); } break; } if (((ifp->if_capenable & IFCAP_RXCSUM) != 0) || ((ifp->if_capenable & IFCAP_RXCSUM_IPV6) != 0)) { ena_rx_checksum(rx_ring, &ena_rx_ctx, mbuf); } counter_enter(); counter_u64_add_protected(rx_ring->rx_stats.bytes, mbuf->m_pkthdr.len); counter_u64_add_protected(adapter->hw_stats.rx_bytes, mbuf->m_pkthdr.len); counter_exit(); /* * LRO is only for IP/TCP packets and TCP checksum of the packet * should be computed by hardware. */ do_if_input = 1; if (((ifp->if_capenable & IFCAP_LRO) != 0) && ((mbuf->m_pkthdr.csum_flags & CSUM_IP_VALID) != 0) && (ena_rx_ctx.l4_proto == ENA_ETH_IO_L4_PROTO_TCP)) { /* * Send to the stack if: * - LRO not enabled, or * - no LRO resources, or * - lro enqueue fails */ if ((rx_ring->lro.lro_cnt != 0) && (tcp_lro_rx(&rx_ring->lro, mbuf, 0) == 0)) do_if_input = 0; } if (do_if_input != 0) { ena_trace(ENA_DBG | ENA_RXPTH, "calling if_input() with mbuf %p\n", mbuf); (*ifp->if_input)(ifp, mbuf); } counter_enter(); counter_u64_add_protected(rx_ring->rx_stats.cnt, 1); counter_u64_add_protected(adapter->hw_stats.rx_packets, 1); counter_exit(); } while (--budget); rx_ring->next_to_clean = next_to_clean; refill_required = ena_com_free_q_entries(io_sq); refill_threshold = min_t(int, rx_ring->ring_size / ENA_RX_REFILL_THRESH_DIVIDER, ENA_RX_REFILL_THRESH_PACKET); if (refill_required > refill_threshold) { ena_com_update_dev_comp_head(rx_ring->ena_com_io_cq); ena_refill_rx_bufs(rx_ring, refill_required); } tcp_lro_flush_all(&rx_ring->lro); return (RX_BUDGET - budget); error: counter_u64_add(rx_ring->rx_stats.bad_desc_num, 1); /* Too many desc from the device. Trigger reset */ ena_trigger_reset(adapter, ENA_REGS_RESET_TOO_MANY_RX_DESCS); return (0); } static void ena_tx_csum(struct ena_com_tx_ctx *ena_tx_ctx, struct mbuf *mbuf, bool disable_meta_caching) { struct ena_com_tx_meta *ena_meta; struct ether_vlan_header *eh; struct mbuf *mbuf_next; u32 mss; bool offload; uint16_t etype; int ehdrlen; struct ip *ip; int iphlen; struct tcphdr *th; int offset; offload = false; ena_meta = &ena_tx_ctx->ena_meta; mss = mbuf->m_pkthdr.tso_segsz; if (mss != 0) offload = true; if ((mbuf->m_pkthdr.csum_flags & CSUM_TSO) != 0) offload = true; if ((mbuf->m_pkthdr.csum_flags & CSUM_OFFLOAD) != 0) offload = true; if (!offload) { if (disable_meta_caching) { memset(ena_meta, 0, sizeof(*ena_meta)); ena_tx_ctx->meta_valid = 1; } else { ena_tx_ctx->meta_valid = 0; } return; } /* Determine where frame payload starts. */ eh = mtod(mbuf, struct ether_vlan_header *); if (eh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { etype = ntohs(eh->evl_proto); ehdrlen = ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN; } else { etype = ntohs(eh->evl_encap_proto); ehdrlen = ETHER_HDR_LEN; } mbuf_next = m_getptr(mbuf, ehdrlen, &offset); ip = (struct ip *)(mtodo(mbuf_next, offset)); iphlen = ip->ip_hl << 2; mbuf_next = m_getptr(mbuf, iphlen + ehdrlen, &offset); th = (struct tcphdr *)(mtodo(mbuf_next, offset)); if ((mbuf->m_pkthdr.csum_flags & CSUM_IP) != 0) { ena_tx_ctx->l3_csum_enable = 1; } if ((mbuf->m_pkthdr.csum_flags & CSUM_TSO) != 0) { ena_tx_ctx->tso_enable = 1; ena_meta->l4_hdr_len = (th->th_off); } switch (etype) { case ETHERTYPE_IP: ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV4; if ((ip->ip_off & htons(IP_DF)) != 0) ena_tx_ctx->df = 1; break; case ETHERTYPE_IPV6: ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV6; default: break; } if (ip->ip_p == IPPROTO_TCP) { ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_TCP; if ((mbuf->m_pkthdr.csum_flags & (CSUM_IP_TCP | CSUM_IP6_TCP)) != 0) ena_tx_ctx->l4_csum_enable = 1; else ena_tx_ctx->l4_csum_enable = 0; } else if (ip->ip_p == IPPROTO_UDP) { ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_UDP; if ((mbuf->m_pkthdr.csum_flags & (CSUM_IP_UDP | CSUM_IP6_UDP)) != 0) ena_tx_ctx->l4_csum_enable = 1; else ena_tx_ctx->l4_csum_enable = 0; } else { ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_UNKNOWN; ena_tx_ctx->l4_csum_enable = 0; } ena_meta->mss = mss; ena_meta->l3_hdr_len = iphlen; ena_meta->l3_hdr_offset = ehdrlen; ena_tx_ctx->meta_valid = 1; } static int ena_check_and_collapse_mbuf(struct ena_ring *tx_ring, struct mbuf **mbuf) { struct ena_adapter *adapter; struct mbuf *collapsed_mbuf; int num_frags; adapter = tx_ring->adapter; num_frags = ena_mbuf_count(*mbuf); /* One segment must be reserved for configuration descriptor. */ if (num_frags < adapter->max_tx_sgl_size) return (0); counter_u64_add(tx_ring->tx_stats.collapse, 1); collapsed_mbuf = m_collapse(*mbuf, M_NOWAIT, adapter->max_tx_sgl_size - 1); if (unlikely(collapsed_mbuf == NULL)) { counter_u64_add(tx_ring->tx_stats.collapse_err, 1); return (ENOMEM); } /* If mbuf was collapsed succesfully, original mbuf is released. */ *mbuf = collapsed_mbuf; return (0); } static int ena_tx_map_mbuf(struct ena_ring *tx_ring, struct ena_tx_buffer *tx_info, struct mbuf *mbuf, void **push_hdr, u16 *header_len) { struct ena_adapter *adapter = tx_ring->adapter; struct ena_com_buf *ena_buf; bus_dma_segment_t segs[ENA_BUS_DMA_SEGS]; size_t iseg = 0; - uint32_t mbuf_head_len, frag_len; - uint16_t push_len = 0; - uint16_t delta = 0; + uint32_t mbuf_head_len; + uint16_t offset; int rc, nsegs; mbuf_head_len = mbuf->m_len; tx_info->mbuf = mbuf; ena_buf = tx_info->bufs; /* * For easier maintaining of the DMA map, map the whole mbuf even if * the LLQ is used. The descriptors will be filled using the segments. */ rc = bus_dmamap_load_mbuf_sg(adapter->tx_buf_tag, tx_info->dmamap, mbuf, segs, &nsegs, BUS_DMA_NOWAIT); if (unlikely((rc != 0) || (nsegs == 0))) { ena_trace(ENA_WARNING, "dmamap load failed! err: %d nsegs: %d\n", rc, nsegs); goto dma_error; } - if (tx_ring->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) { /* * When the device is LLQ mode, the driver will copy * the header into the device memory space. * the ena_com layer assumes the header is in a linear * memory space. * This assumption might be wrong since part of the header * can be in the fragmented buffers. * First check if header fits in the mbuf. If not, copy it to * separate buffer that will be holding linearized data. */ - push_len = min_t(uint32_t, mbuf->m_pkthdr.len, - tx_ring->tx_max_header_size); - *header_len = push_len; + *header_len = min_t(uint32_t, mbuf->m_pkthdr.len, tx_ring->tx_max_header_size); + /* If header is in linear space, just point into mbuf's data. */ - if (likely(push_len <= mbuf_head_len)) { + if (likely(*header_len <= mbuf_head_len)) { *push_hdr = mbuf->m_data; /* * Otherwise, copy whole portion of header from multiple mbufs * to intermediate buffer. */ } else { - m_copydata(mbuf, 0, push_len, - tx_ring->push_buf_intermediate_buf); + m_copydata(mbuf, 0, *header_len, tx_ring->push_buf_intermediate_buf); *push_hdr = tx_ring->push_buf_intermediate_buf; counter_u64_add(tx_ring->tx_stats.llq_buffer_copy, 1); - delta = push_len - mbuf_head_len; } ena_trace(ENA_DBG | ENA_TXPTH, "mbuf: %p header_buf->vaddr: %p push_len: %d\n", - mbuf, *push_hdr, push_len); + mbuf, *push_hdr, *header_len); - /* - * If header was in linear memory space, map for the dma rest of the data - * in the first mbuf of the mbuf chain. - */ - if (mbuf_head_len > push_len) { - ena_buf->paddr = segs[iseg].ds_addr + push_len; - ena_buf->len = segs[iseg].ds_len - push_len; - ena_buf++; - tx_info->num_of_bufs++; + /* If packet is fitted in LLQ header, no need for DMA segments. */ + if (mbuf->m_pkthdr.len <= tx_ring->tx_max_header_size) { + return (0); + } else { + offset = tx_ring->tx_max_header_size; + /* + * As Header part is mapped to LLQ header, we can skip it and just + * map the residuum of the mbuf to DMA Segments. + */ + while (offset > 0) { + if (offset >= segs[iseg].ds_len) { + offset -= segs[iseg].ds_len; + } else { + ena_buf->paddr = segs[iseg].ds_addr + offset; + ena_buf->len = segs[iseg].ds_len - offset; + ena_buf++; + tx_info->num_of_bufs++; + offset = 0; + } + iseg++; + } } - /* - * Advance the seg index as either the 1st mbuf was mapped or is - * a part of push_hdr. - */ - iseg++; } else { *push_hdr = NULL; /* * header_len is just a hint for the device. Because FreeBSD is not * giving us information about packet header length and it is not * guaranteed that all packet headers will be in the 1st mbuf, setting * header_len to 0 is making the device ignore this value and resolve * header on it's own. */ *header_len = 0; - } - - /* - * If header is in non linear space (delta > 0), then skip mbufs - * containing header and map the last one containing both header and the - * packet data. - * The first segment is already counted in. - * If LLQ is not supported, the loop will be skipped. - */ - while (delta > 0) { - frag_len = segs[iseg].ds_len; - - /* - * If whole segment contains header just move to the - * next one and reduce delta. - */ - if (unlikely(delta >= frag_len)) { - delta -= frag_len; - } else { - /* - * Map rest of the packet data that was contained in - * the mbuf. - */ - ena_buf->paddr = segs[iseg].ds_addr + delta; - ena_buf->len = frag_len - delta; - ena_buf++; - tx_info->num_of_bufs++; - - delta = 0; - } - iseg++; - } - - if (mbuf == NULL) { - return (0); } /* Map rest of the mbuf */ while (iseg < nsegs) { ena_buf->paddr = segs[iseg].ds_addr; ena_buf->len = segs[iseg].ds_len; ena_buf++; iseg++; tx_info->num_of_bufs++; } return (0); dma_error: counter_u64_add(tx_ring->tx_stats.dma_mapping_err, 1); tx_info->mbuf = NULL; return (rc); } static int ena_xmit_mbuf(struct ena_ring *tx_ring, struct mbuf **mbuf) { struct ena_adapter *adapter; struct ena_tx_buffer *tx_info; struct ena_com_tx_ctx ena_tx_ctx; struct ena_com_dev *ena_dev; struct ena_com_io_sq* io_sq; void *push_hdr; uint16_t next_to_use; uint16_t req_id; uint16_t ena_qid; uint16_t header_len; int rc; int nb_hw_desc; ena_qid = ENA_IO_TXQ_IDX(tx_ring->que->id); adapter = tx_ring->que->adapter; ena_dev = adapter->ena_dev; io_sq = &ena_dev->io_sq_queues[ena_qid]; rc = ena_check_and_collapse_mbuf(tx_ring, mbuf); if (unlikely(rc != 0)) { ena_trace(ENA_WARNING, "Failed to collapse mbuf! err: %d\n", rc); return (rc); } ena_trace(ENA_DBG | ENA_TXPTH, "Tx: %d bytes\n", (*mbuf)->m_pkthdr.len); next_to_use = tx_ring->next_to_use; req_id = tx_ring->free_tx_ids[next_to_use]; tx_info = &tx_ring->tx_buffer_info[req_id]; tx_info->num_of_bufs = 0; rc = ena_tx_map_mbuf(tx_ring, tx_info, *mbuf, &push_hdr, &header_len); if (unlikely(rc != 0)) { ena_trace(ENA_WARNING, "Failed to map TX mbuf\n"); return (rc); } memset(&ena_tx_ctx, 0x0, sizeof(struct ena_com_tx_ctx)); ena_tx_ctx.ena_bufs = tx_info->bufs; ena_tx_ctx.push_header = push_hdr; ena_tx_ctx.num_bufs = tx_info->num_of_bufs; ena_tx_ctx.req_id = req_id; ena_tx_ctx.header_len = header_len; /* Set flags and meta data */ ena_tx_csum(&ena_tx_ctx, *mbuf, adapter->disable_meta_caching); if (tx_ring->acum_pkts == DB_THRESHOLD || ena_com_is_doorbell_needed(tx_ring->ena_com_io_sq, &ena_tx_ctx)) { ena_trace(ENA_DBG | ENA_TXPTH, "llq tx max burst size of queue %d achieved, writing doorbell to send burst\n", tx_ring->que->id); ena_com_write_sq_doorbell(tx_ring->ena_com_io_sq); counter_u64_add(tx_ring->tx_stats.doorbells, 1); tx_ring->acum_pkts = 0; } /* Prepare the packet's descriptors and send them to device */ rc = ena_com_prepare_tx(io_sq, &ena_tx_ctx, &nb_hw_desc); if (unlikely(rc != 0)) { if (likely(rc == ENA_COM_NO_MEM)) { ena_trace(ENA_DBG | ENA_TXPTH, "tx ring[%d] if out of space\n", tx_ring->que->id); } else { device_printf(adapter->pdev, "failed to prepare tx bufs\n"); } counter_u64_add(tx_ring->tx_stats.prepare_ctx_err, 1); goto dma_error; } counter_enter(); counter_u64_add_protected(tx_ring->tx_stats.cnt, 1); counter_u64_add_protected(tx_ring->tx_stats.bytes, (*mbuf)->m_pkthdr.len); counter_u64_add_protected(adapter->hw_stats.tx_packets, 1); counter_u64_add_protected(adapter->hw_stats.tx_bytes, (*mbuf)->m_pkthdr.len); counter_exit(); tx_info->tx_descs = nb_hw_desc; getbinuptime(&tx_info->timestamp); tx_info->print_once = true; tx_ring->next_to_use = ENA_TX_RING_IDX_NEXT(next_to_use, tx_ring->ring_size); /* stop the queue when no more space available, the packet can have up * to sgl_size + 2. one for the meta descriptor and one for header * (if the header is larger than tx_max_header_size). */ if (unlikely(!ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq, adapter->max_tx_sgl_size + 2))) { ena_trace(ENA_DBG | ENA_TXPTH, "Stop queue %d\n", tx_ring->que->id); tx_ring->running = false; counter_u64_add(tx_ring->tx_stats.queue_stop, 1); /* There is a rare condition where this function decides to * stop the queue but meanwhile tx_cleanup() updates * next_to_completion and terminates. * The queue will remain stopped forever. * To solve this issue this function performs mb(), checks * the wakeup condition and wakes up the queue if needed. */ mb(); if (ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq, ENA_TX_RESUME_THRESH)) { tx_ring->running = true; counter_u64_add(tx_ring->tx_stats.queue_wakeup, 1); } } bus_dmamap_sync(adapter->tx_buf_tag, tx_info->dmamap, BUS_DMASYNC_PREWRITE); return (0); dma_error: tx_info->mbuf = NULL; bus_dmamap_unload(adapter->tx_buf_tag, tx_info->dmamap); return (rc); } static void ena_start_xmit(struct ena_ring *tx_ring) { struct mbuf *mbuf; struct ena_adapter *adapter = tx_ring->adapter; struct ena_com_io_sq* io_sq; int ena_qid; int ret = 0; if (unlikely((if_getdrvflags(adapter->ifp) & IFF_DRV_RUNNING) == 0)) return; if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_LINK_UP, adapter))) return; ena_qid = ENA_IO_TXQ_IDX(tx_ring->que->id); io_sq = &adapter->ena_dev->io_sq_queues[ena_qid]; while ((mbuf = drbr_peek(adapter->ifp, tx_ring->br)) != NULL) { ena_trace(ENA_DBG | ENA_TXPTH, "\ndequeued mbuf %p with flags %#x and" " header csum flags %#jx\n", mbuf, mbuf->m_flags, (uint64_t)mbuf->m_pkthdr.csum_flags); if (unlikely(!tx_ring->running)) { drbr_putback(adapter->ifp, tx_ring->br, mbuf); break; } if (unlikely((ret = ena_xmit_mbuf(tx_ring, &mbuf)) != 0)) { if (ret == ENA_COM_NO_MEM) { drbr_putback(adapter->ifp, tx_ring->br, mbuf); } else if (ret == ENA_COM_NO_SPACE) { drbr_putback(adapter->ifp, tx_ring->br, mbuf); } else { m_freem(mbuf); drbr_advance(adapter->ifp, tx_ring->br); } break; } drbr_advance(adapter->ifp, tx_ring->br); if (unlikely((if_getdrvflags(adapter->ifp) & IFF_DRV_RUNNING) == 0)) return; tx_ring->acum_pkts++; BPF_MTAP(adapter->ifp, mbuf); } if (likely(tx_ring->acum_pkts != 0)) { /* Trigger the dma engine */ ena_com_write_sq_doorbell(io_sq); counter_u64_add(tx_ring->tx_stats.doorbells, 1); tx_ring->acum_pkts = 0; } if (unlikely(!tx_ring->running)) taskqueue_enqueue(tx_ring->que->cleanup_tq, &tx_ring->que->cleanup_task); }