From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by dpdk.org (Postfix) with ESMTP id 1F0C21B1A3 for ; Fri, 8 Jun 2018 03:20:57 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jun 2018 18:20:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,488,1520924400"; d="scan'208";a="230856647" Received: from dpdk-test32.sh.intel.com ([10.67.119.57]) by orsmga005.jf.intel.com with ESMTP; 07 Jun 2018 18:20:56 -0700 From: Marvin Liu To: maxime.coquelin@redhat.com, tiwei.bie@intel.com Cc: zhihong.wang@intel.com, dev@dpdk.org, Marvin Liu Date: Fri, 8 Jun 2018 17:07:22 +0800 Message-Id: <20180608090724.20855-6-yong.liu@intel.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180608090724.20855-1-yong.liu@intel.com> References: <20180608090724.20855-1-yong.liu@intel.com> Subject: [dpdk-dev] [PATCH 5/7] net/virtio: support IN_ORDER Rx and Tx X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Jun 2018 01:20:59 -0000 IN_ORDER Rx function can support merge-able feature. Descriptors allocation and free will be done in bulk. Virtio dequeue logic: dequeue_burst_rx(burst mbufs) for (each mbuf b) { if (b need merge) { merge remained mbufs add merged mbuf to return mbufs list } else { add mbuf to return mbufs list } } if (last mbuf c need merge) { dequeue_burst_rx(required mbufs) merge last mbuf c } refill_avail_ring_bulk() update_avail_ring() return mbufs list IN_ORDER Tx function can support indirect and offloading features. Virtio enqueue logic: xmit_cleanup(used descs) for (each xmit mbuf b) { if (b can inorder xmit) { add mbuf b to inorder burst list } else { xmit inorder burst list xmit mbuf b with normal xmit } } if (inorder burst list not empty) { xmit inorder burst list } update_avail_ring() Signed-off-by: Marvin Liu diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h index bb40064ea..25697c872 100644 --- a/drivers/net/virtio/virtio_ethdev.h +++ b/drivers/net/virtio/virtio_ethdev.h @@ -83,9 +83,15 @@ uint16_t virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t virtio_recv_mergeable_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts); +uint16_t virtio_recv_inorder_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, + uint16_t nb_pkts); + uint16_t virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts); +uint16_t virtio_xmit_inorder_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, + uint16_t nb_pkts); + uint16_t virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts); diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c index 0bca29855..d0473d6b4 100644 --- a/drivers/net/virtio/virtio_rxtx.c +++ b/drivers/net/virtio/virtio_rxtx.c @@ -122,6 +122,45 @@ virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts, return i; } +static uint16_t +virtqueue_dequeue_inorder_rx(struct virtqueue *vq, + struct rte_mbuf **rx_pkts, + uint32_t *len, + uint16_t num) +{ + struct vring_used_elem *uep; + struct rte_mbuf *cookie; + uint16_t used_idx; + uint16_t i; + + if (unlikely(num == 0)) + return 0; + + used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1); + for (i = 0; i < num; i++) { + used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1); + /* Desc idx same as used idx */ + uep = &vq->vq_ring.used->ring[used_idx]; + len[i] = uep->len; + cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie; + + if (unlikely(cookie == NULL)) { + PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u", + vq->vq_used_cons_idx); + break; + } + + rte_prefetch0(cookie); + rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *)); + rx_pkts[i] = cookie; + vq->vq_used_cons_idx++; + vq->vq_descx[used_idx].cookie = NULL; + } + + vq_ring_free_inorder(vq, used_idx, i); + return i; +} + #ifndef DEFAULT_TX_FREE_THRESH #define DEFAULT_TX_FREE_THRESH 32 #endif @@ -150,6 +189,70 @@ virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num) } } +/* Cleanup from completed inorder transmits. */ +static void +virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num) +{ + uint16_t i, used_idx; + + used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1); + for (i = 0; i < num; i++) { + struct vq_desc_extra *dxp; + + used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1); + dxp = &vq->vq_descx[used_idx]; + vq->vq_used_cons_idx++; + + if (dxp->cookie != NULL) { + rte_pktmbuf_free(dxp->cookie); + dxp->cookie = NULL; + } + } + vq_ring_free_inorder(vq, used_idx, num); +} + +static inline int +virtqueue_enqueue_inorder_refill(struct virtqueue *vq, + struct rte_mbuf **cookies, + uint16_t num) +{ + struct vq_desc_extra *dxp; + struct virtio_hw *hw = vq->hw; + struct vring_desc *start_dp; + uint16_t head_idx, idx, i = 0; + + if (unlikely(vq->vq_free_cnt == 0)) + return -ENOSPC; + if (unlikely(vq->vq_free_cnt < num)) + return -EMSGSIZE; + + head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1); + start_dp = vq->vq_ring.desc; + + while (i < num) { + idx = head_idx & (vq->vq_nentries - 1); + dxp = &vq->vq_descx[idx]; + dxp->cookie = (void *)(struct rte_mbuf *)cookies[i]; + dxp->ndescs = 1; + + start_dp[idx].addr = + VIRTIO_MBUF_ADDR(cookies[i], vq) + + RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size; + start_dp[idx].len = + cookies[i]->buf_len - + RTE_PKTMBUF_HEADROOM + + hw->vtnet_hdr_size; + start_dp[idx].flags = VRING_DESC_F_WRITE; + + head_idx++; + i++; + } + + vq->vq_avail_idx += num; + vq->vq_desc_head_idx += num; + vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num); + return 0; +} static inline int virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie) @@ -246,9 +349,113 @@ tx_offload_enabled(struct virtio_hw *hw) (var) = (val); \ } while (0) +static inline void +virtqueue_xmit_offload(struct virtio_net_hdr *hdr, + struct rte_mbuf *cookie, + int offload) +{ + if (offload) { + if (cookie->ol_flags & PKT_TX_TCP_SEG) + cookie->ol_flags |= PKT_TX_TCP_CKSUM; + + switch (cookie->ol_flags & PKT_TX_L4_MASK) { + case PKT_TX_UDP_CKSUM: + hdr->csum_start = cookie->l2_len + cookie->l3_len; + hdr->csum_offset = offsetof(struct udp_hdr, + dgram_cksum); + hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + break; + + case PKT_TX_TCP_CKSUM: + hdr->csum_start = cookie->l2_len + cookie->l3_len; + hdr->csum_offset = offsetof(struct tcp_hdr, cksum); + hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + break; + + default: + ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0); + ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0); + ASSIGN_UNLESS_EQUAL(hdr->flags, 0); + break; + } + + /* TCP Segmentation Offload */ + if (cookie->ol_flags & PKT_TX_TCP_SEG) { + virtio_tso_fix_cksum(cookie); + hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ? + VIRTIO_NET_HDR_GSO_TCPV6 : + VIRTIO_NET_HDR_GSO_TCPV4; + hdr->gso_size = cookie->tso_segsz; + hdr->hdr_len = + cookie->l2_len + + cookie->l3_len + + cookie->l4_len; + } else { + ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0); + ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0); + ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0); + } + } +} + +static inline void +virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq, + struct rte_mbuf **cookies, + uint16_t num) +{ + struct vq_desc_extra *dxp; + struct virtqueue *vq = txvq->vq; + struct vring_desc *start_dp; + struct virtio_net_hdr *hdr; + uint16_t idx; + uint16_t head_size = vq->hw->vtnet_hdr_size; + int offload; + uint16_t i = 0; + + idx = vq->vq_desc_head_idx; + start_dp = vq->vq_ring.desc; + + offload = tx_offload_enabled(vq->hw); + + while (i < num) { + idx = idx & (vq->vq_nentries - 1); + dxp = &vq->vq_descx[idx]; + dxp->cookie = (void *)cookies[i]; + dxp->ndescs = 1; + + hdr = (struct virtio_net_hdr *) + rte_pktmbuf_prepend(cookies[i], head_size); + cookies[i]->pkt_len -= head_size; + + /* if offload disabled, it is not zeroed below, do it now */ + if (offload == 0) { + ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0); + ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0); + ASSIGN_UNLESS_EQUAL(hdr->flags, 0); + ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0); + ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0); + ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0); + } + + virtqueue_xmit_offload(hdr, cookies[i], offload); + + start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq); + start_dp[idx].len = cookies[i]->data_len; + start_dp[idx].flags = 0; + + idx++; + i++; + }; + + vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num); + vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1); + vq->vq_avail_idx += num; +} + static inline void virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, - uint16_t needed, int use_indirect, int can_push) + uint16_t needed, int use_indirect, int can_push, + int in_order) { struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr; struct vq_desc_extra *dxp; @@ -261,6 +468,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, int offload; offload = tx_offload_enabled(vq->hw); + head_idx = vq->vq_desc_head_idx; idx = head_idx; dxp = &vq->vq_descx[idx]; @@ -277,6 +485,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, * which is wrong. Below subtract restores correct pkt size. */ cookie->pkt_len -= head_size; + /* if offload disabled, it is not zeroed below, do it now */ if (offload == 0) { ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0); @@ -315,49 +524,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, idx = start_dp[idx].next; } - /* Checksum Offload / TSO */ - if (offload) { - if (cookie->ol_flags & PKT_TX_TCP_SEG) - cookie->ol_flags |= PKT_TX_TCP_CKSUM; - - switch (cookie->ol_flags & PKT_TX_L4_MASK) { - case PKT_TX_UDP_CKSUM: - hdr->csum_start = cookie->l2_len + cookie->l3_len; - hdr->csum_offset = offsetof(struct udp_hdr, - dgram_cksum); - hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; - break; - - case PKT_TX_TCP_CKSUM: - hdr->csum_start = cookie->l2_len + cookie->l3_len; - hdr->csum_offset = offsetof(struct tcp_hdr, cksum); - hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; - break; - - default: - ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0); - ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0); - ASSIGN_UNLESS_EQUAL(hdr->flags, 0); - break; - } - - /* TCP Segmentation Offload */ - if (cookie->ol_flags & PKT_TX_TCP_SEG) { - virtio_tso_fix_cksum(cookie); - hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ? - VIRTIO_NET_HDR_GSO_TCPV6 : - VIRTIO_NET_HDR_GSO_TCPV4; - hdr->gso_size = cookie->tso_segsz; - hdr->hdr_len = - cookie->l2_len + - cookie->l3_len + - cookie->l4_len; - } else { - ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0); - ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0); - ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0); - } - } + virtqueue_xmit_offload(hdr, cookie, offload); do { start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq); @@ -369,11 +536,20 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, if (use_indirect) idx = vq->vq_ring.desc[head_idx].next; - vq->vq_desc_head_idx = idx; - if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) - vq->vq_desc_tail_idx = idx; vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); - vq_update_avail_ring(vq, head_idx); + + if (in_order) { + if (likely(use_indirect)) + vq->vq_avail_idx++; + else + vq->vq_avail_idx += needed; + vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1); + } else { + vq->vq_desc_head_idx = idx; + if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) + vq->vq_desc_tail_idx = idx; + vq_update_avail_ring(vq, head_idx); + } } void @@ -583,6 +759,19 @@ virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) * successful since it was just dequeued. */ error = virtqueue_enqueue_recv_refill(vq, m); + + if (unlikely(error)) { + RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); + rte_pktmbuf_free(m); + } +} + +static void +virtio_discard_inorder_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) +{ + int error; + + error = virtqueue_enqueue_inorder_refill(vq, &m, 1); if (unlikely(error)) { RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); rte_pktmbuf_free(m); @@ -813,6 +1002,191 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) return nb_rx; } +uint16_t +virtio_recv_inorder_pkts(void *rx_queue, + struct rte_mbuf **rx_pkts, + uint16_t nb_pkts) +{ + struct virtnet_rx *rxvq = rx_queue; + struct virtqueue *vq = rxvq->vq; + struct virtio_hw *hw = vq->hw; + struct rte_mbuf *rxm; + struct rte_mbuf *prev; + uint16_t nb_used, num, nb_rx; + uint32_t len[VIRTIO_MBUF_BURST_SZ]; + struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; + int error; + uint32_t i, nb_enqueued; + uint32_t seg_num; + uint32_t seg_res; + uint32_t hdr_size; + int offload; + + nb_rx = 0; + if (unlikely(hw->started == 0)) + return nb_rx; + + nb_used = VIRTQUEUE_NUSED(vq); + nb_used = RTE_MIN(nb_used, nb_pkts); + nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ); + + virtio_rmb(); + + PMD_RX_LOG(DEBUG, "used:%d", nb_used); + + i = 0; + nb_enqueued = 0; + seg_num = 1; + seg_res = 0; + hdr_size = hw->vtnet_hdr_size; + offload = rx_offload_enabled(hw); + + num = virtqueue_dequeue_inorder_rx(vq, rcv_pkts, len, nb_used); + + for (; i < num; i++) { + struct virtio_net_hdr_mrg_rxbuf *header; + + PMD_RX_LOG(DEBUG, "dequeue:%d", num); + PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); + + rxm = rcv_pkts[i]; + + if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { + PMD_RX_LOG(ERR, "Packet drop"); + nb_enqueued++; + virtio_discard_inorder_rxbuf(vq, rxm); + rxvq->stats.errors++; + continue; + } + + header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr + + RTE_PKTMBUF_HEADROOM - hdr_size); + seg_num = header->num_buffers; + + if (seg_num == 0) + seg_num = 1; + + rxm->data_off = RTE_PKTMBUF_HEADROOM; + rxm->nb_segs = seg_num; + rxm->ol_flags = 0; + rxm->vlan_tci = 0; + rxm->pkt_len = (uint32_t)(len[i] - hdr_size); + rxm->data_len = (uint16_t)(len[i] - hdr_size); + + rxm->port = rxvq->port_id; + + rx_pkts[nb_rx] = rxm; + prev = rxm; + + if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) { + virtio_discard_inorder_rxbuf(vq, rxm); + rxvq->stats.errors++; + continue; + } + + seg_res = seg_num - 1; + + /* Merge remaining segments */ + while (seg_res != 0 && i < num) { + rxm = rcv_pkts[i]; + rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; + rxm->pkt_len = (uint32_t)(len[i]); + rxm->data_len = (uint16_t)(len[i]); + + rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]); + rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]); + + i++; + + if (prev) + prev->next = rxm; + + prev = rxm; + seg_res -= 1; + } + + if (hw->vlan_strip) + rte_vlan_strip(rx_pkts[nb_rx]); + + VIRTIO_DUMP_PACKET(rx_pkts[nb_rx], + rx_pkts[nb_rx]->data_len); + + rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len; + virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]); + nb_rx++; + } + + /* Last packet still need merge segments */ + while (seg_res != 0) { + uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res, + VIRTIO_MBUF_BURST_SZ); + + prev = rcv_pkts[nb_rx - 1]; + if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { + num = virtqueue_dequeue_inorder_rx(vq, rcv_pkts, len, + rcv_cnt); + uint16_t extra_idx = 0; + + rcv_cnt = num; + while (extra_idx < rcv_cnt) { + rxm = rcv_pkts[extra_idx]; + rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; + rxm->pkt_len = (uint32_t)(len[extra_idx]); + rxm->data_len = (uint16_t)(len[extra_idx]); + prev->next = rxm; + prev = rxm; + rx_pkts[nb_rx - 1]->pkt_len += len[extra_idx]; + rx_pkts[nb_rx - 1]->data_len += len[extra_idx]; + extra_idx += 1; + }; + seg_res -= rcv_cnt; + } else { + PMD_RX_LOG(ERR, + "No enough segments for packet."); + virtio_discard_inorder_rxbuf(vq, prev); + rxvq->stats.errors++; + nb_rx--; + break; + } + } + + rxvq->stats.packets += nb_rx; + + /* Allocate new mbuf for the used descriptor */ + error = ENOSPC; + + if (likely(!virtqueue_full(vq))) { + /* free_cnt may include mrg descs */ + uint16_t free_cnt = vq->vq_free_cnt; + struct rte_mbuf *new_pkts[free_cnt]; + + if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) { + error = virtqueue_enqueue_inorder_refill(vq, new_pkts, + free_cnt); + if (unlikely(error)) { + for (i = 0; i < free_cnt; i++) + rte_pktmbuf_free(new_pkts[i]); + } + nb_enqueued += free_cnt; + } else { + struct rte_eth_dev *dev + = &rte_eth_devices[rxvq->port_id]; + dev->data->rx_mbuf_alloc_failed += free_cnt; + } + } + + if (likely(nb_enqueued)) { + vq_update_avail_idx(vq); + + if (unlikely(virtqueue_kick_prepare(vq))) { + virtqueue_notify(vq); + PMD_RX_LOG(DEBUG, "Notified"); + } + } + + return nb_rx; +} + uint16_t virtio_recv_mergeable_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, @@ -1060,7 +1434,8 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) } /* Enqueue Packet buffers */ - virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push); + virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, + can_push, 0); txvq->stats.bytes += txm->pkt_len; virtio_update_packet_stats(&txvq->stats, txm); @@ -1079,3 +1454,121 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) return nb_tx; } + +uint16_t +virtio_xmit_inorder_pkts(void *tx_queue, + struct rte_mbuf **tx_pkts, + uint16_t nb_pkts) +{ + struct virtnet_tx *txvq = tx_queue; + struct virtqueue *vq = txvq->vq; + struct virtio_hw *hw = vq->hw; + uint16_t hdr_size = hw->vtnet_hdr_size; + uint16_t nb_used, nb_avail, nb_tx = 0, inorder_tx = 0; + struct rte_mbuf *inorder_pkts[nb_pkts]; + int error; + + if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts)) + return nb_tx; + + if (unlikely(nb_pkts < 1)) + return nb_pkts; + + VIRTQUEUE_DUMP(vq); + PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); + nb_used = VIRTQUEUE_NUSED(vq); + + virtio_rmb(); + if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh)) + virtio_xmit_cleanup_inorder(vq, nb_used); + + nb_avail = RTE_MIN(vq->vq_free_cnt, nb_pkts); + + for (nb_tx = 0; nb_tx < nb_avail; nb_tx++) { + struct rte_mbuf *txm = tx_pkts[nb_tx]; + int slots, need; + int can_push = 0, use_indirect = 0, flush_inorder = 1; + + /* Do VLAN tag insertion */ + if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { + error = rte_vlan_insert(&txm); + if (unlikely(error)) { + rte_pktmbuf_free(txm); + continue; + } + } + + txvq->stats.bytes += txm->pkt_len; + virtio_update_packet_stats(&txvq->stats, txm); + + /* optimize ring usage */ + if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) || + vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) && + rte_mbuf_refcnt_read(txm) == 1 && + RTE_MBUF_DIRECT(txm) && + txm->nb_segs == 1 && + rte_pktmbuf_headroom(txm) >= hdr_size && + rte_is_aligned(rte_pktmbuf_mtod(txm, char *), + __alignof__(struct virtio_net_hdr_mrg_rxbuf))) { + can_push = 1; + + inorder_pkts[inorder_tx] = txm; + inorder_tx++; + flush_inorder = 0; + } else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) && + txm->nb_segs < VIRTIO_MAX_TX_INDIRECT) { + use_indirect = 1; + } + + if (flush_inorder) { + /* Flush inorder packets */ + virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts, + inorder_tx); + inorder_tx = 0; + + /* How many main ring entries are needed to this Tx? + * any_layout => number of segments + * indirect => 1 + * default => number of segments + 1 + */ + slots = use_indirect ? 1 : (txm->nb_segs + !can_push); + need = slots - vq->vq_free_cnt; + + if (unlikely(need > 0)) { + nb_used = VIRTQUEUE_NUSED(vq); + virtio_rmb(); + need = RTE_MIN(need, (int)nb_used); + + virtio_xmit_cleanup_inorder(vq, need); + need = slots - vq->vq_free_cnt; + if (unlikely(need > 0)) { + PMD_TX_LOG(ERR, + "No free tx descriptors to transmit"); + break; + } + } + /* Enqueue Packet buffers */ + virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, + can_push, 1); + } + } + + /* Transmit all inorder packets */ + if (inorder_tx) + virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts, inorder_tx); + + txvq->stats.packets += nb_tx; + + if (likely(nb_tx)) { + vq_update_avail_idx(vq); + + if (unlikely(virtqueue_kick_prepare(vq))) { + virtqueue_notify(vq); + PMD_TX_LOG(DEBUG, "Notified backend after xmit"); + } + } + + VIRTQUEUE_DUMP(vq); + + return nb_tx; +} -- 2.17.0