From 13ce5e7eb94fc3b4049d1127c78692eb22b5bd6c Mon Sep 17 00:00:00 2001 From: Ouyang Changchun Date: Thu, 14 Aug 2014 16:54:35 +0800 Subject: [PATCH] virtio: mergeable buffers This patch supports mergeable buffer feature in DPDK based virtio PMD, which can receive jumbo frame with larger size, like 3K, 4K or even 9K. Signed-off-by: Changchun Ouyang Acked-by: Huawei Xie Tested-by: Jingguo Fu --- lib/librte_pmd_virtio/virtio_ethdev.c | 20 +-- lib/librte_pmd_virtio/virtio_ethdev.h | 3 + lib/librte_pmd_virtio/virtio_rxtx.c | 221 ++++++++++++++++++++++---- 3 files changed, 207 insertions(+), 37 deletions(-) diff --git a/lib/librte_pmd_virtio/virtio_ethdev.c b/lib/librte_pmd_virtio/virtio_ethdev.c index 6293ac662a..3344ffb9e0 100644 --- a/lib/librte_pmd_virtio/virtio_ethdev.c +++ b/lib/librte_pmd_virtio/virtio_ethdev.c @@ -337,7 +337,7 @@ int virtio_dev_queue_setup(struct rte_eth_dev *dev, snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone", dev->data->port_id, queue_idx); vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name, - vq_size * sizeof(struct virtio_net_hdr), + vq_size * hw->vtnet_hdr_size, socket_id, 0, CACHE_LINE_SIZE); if (vq->virtio_net_hdr_mz == NULL) { rte_free(vq); @@ -346,7 +346,7 @@ int virtio_dev_queue_setup(struct rte_eth_dev *dev, vq->virtio_net_hdr_mem = vq->virtio_net_hdr_mz->phys_addr; memset(vq->virtio_net_hdr_mz->addr, 0, - vq_size * sizeof(struct virtio_net_hdr)); + vq_size * hw->vtnet_hdr_size); } else if (queue_type == VTNET_CQ) { /* Allocate a page for control vq command, data and status */ snprintf(vq_name, sizeof(vq_name), "port%d_cvq_hdrzone", @@ -571,9 +571,6 @@ virtio_negotiate_features(struct virtio_hw *hw) mask |= VIRTIO_NET_F_GUEST_TSO4 | VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN; mask |= VTNET_LRO_FEATURES; - /* rx_mbuf should not be in multiple merged segments */ - mask |= VIRTIO_NET_F_MRG_RXBUF; - /* not negotiating INDIRECT descriptor table support */ mask |= VIRTIO_RING_F_INDIRECT_DESC; @@ -746,7 +743,6 @@ eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv, } eth_dev->dev_ops = &virtio_eth_dev_ops; - eth_dev->rx_pkt_burst = &virtio_recv_pkts; eth_dev->tx_pkt_burst = &virtio_xmit_pkts; if (rte_eal_process_type() == RTE_PROC_SECONDARY) @@ -801,10 +797,13 @@ eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv, virtio_negotiate_features(hw); /* Setting up rx_header size for the device */ - if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) + if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) { + eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts; hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); - else + } else { + eth_dev->rx_pkt_burst = &virtio_recv_pkts; hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr); + } /* Allocate memory for storing MAC addresses */ eth_dev->data->mac_addrs = rte_zmalloc("virtio", ETHER_ADDR_LEN, 0); @@ -1009,7 +1008,7 @@ static void virtio_dev_free_mbufs(struct rte_eth_dev *dev) while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused( dev->data->rx_queues[i])) != NULL) { - rte_pktmbuf_free_seg(buf); + rte_pktmbuf_free(buf); mbuf_num++; } @@ -1028,7 +1027,8 @@ static void virtio_dev_free_mbufs(struct rte_eth_dev *dev) mbuf_num = 0; while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused( dev->data->tx_queues[i])) != NULL) { - rte_pktmbuf_free_seg(buf); + rte_pktmbuf_free(buf); + mbuf_num++; } diff --git a/lib/librte_pmd_virtio/virtio_ethdev.h b/lib/librte_pmd_virtio/virtio_ethdev.h index 858e644279..d2e1eede15 100644 --- a/lib/librte_pmd_virtio/virtio_ethdev.h +++ b/lib/librte_pmd_virtio/virtio_ethdev.h @@ -104,6 +104,9 @@ int virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id, uint16_t virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts); +uint16_t virtio_recv_mergeable_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); diff --git a/lib/librte_pmd_virtio/virtio_rxtx.c b/lib/librte_pmd_virtio/virtio_rxtx.c index fcd8bd1d35..0b10108a34 100644 --- a/lib/librte_pmd_virtio/virtio_rxtx.c +++ b/lib/librte_pmd_virtio/virtio_rxtx.c @@ -146,6 +146,7 @@ static inline int virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie) { struct vq_desc_extra *dxp; + struct virtio_hw *hw = vq->hw; struct vring_desc *start_dp; uint16_t needed = 1; uint16_t head_idx, idx; @@ -165,9 +166,11 @@ virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie) dxp->ndescs = needed; start_dp = vq->vq_ring.desc; - start_dp[idx].addr = - (uint64_t) (cookie->buf_physaddr + RTE_PKTMBUF_HEADROOM - sizeof(struct virtio_net_hdr)); - start_dp[idx].len = cookie->buf_len - RTE_PKTMBUF_HEADROOM + sizeof(struct virtio_net_hdr); + start_dp[idx].addr = + (uint64_t)(cookie->buf_physaddr + RTE_PKTMBUF_HEADROOM + - hw->vtnet_hdr_size); + start_dp[idx].len = + cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size; start_dp[idx].flags = VRING_DESC_F_WRITE; idx = start_dp[idx].next; vq->vq_desc_head_idx = idx; @@ -184,8 +187,10 @@ virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie) { struct vq_desc_extra *dxp; struct vring_desc *start_dp; - uint16_t needed = 2; + uint16_t seg_num = cookie->pkt.nb_segs; + uint16_t needed = 1 + seg_num; uint16_t head_idx, idx; + uint16_t head_size = txvq->hw->vtnet_hdr_size; if (unlikely(txvq->vq_free_cnt == 0)) return -ENOSPC; @@ -198,19 +203,25 @@ virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie) idx = head_idx; dxp = &txvq->vq_descx[idx]; if (dxp->cookie != NULL) - rte_pktmbuf_free_seg(dxp->cookie); + rte_pktmbuf_free(dxp->cookie); dxp->cookie = (void *)cookie; dxp->ndescs = needed; start_dp = txvq->vq_ring.desc; - start_dp[idx].addr = - txvq->virtio_net_hdr_mem + idx * sizeof(struct virtio_net_hdr); - start_dp[idx].len = sizeof(struct virtio_net_hdr); + start_dp[idx].addr = + txvq->virtio_net_hdr_mem + idx * head_size; + start_dp[idx].len = (uint32_t)head_size; start_dp[idx].flags = VRING_DESC_F_NEXT; - idx = start_dp[idx].next; - start_dp[idx].addr = RTE_MBUF_DATA_DMA_ADDR(cookie); - start_dp[idx].len = cookie->pkt.data_len; - start_dp[idx].flags = 0; + + for (; ((seg_num > 0) && (cookie != NULL)); seg_num--) { + idx = start_dp[idx].next; + start_dp[idx].addr = RTE_MBUF_DATA_DMA_ADDR(cookie); + start_dp[idx].len = cookie->pkt.data_len; + start_dp[idx].flags = VRING_DESC_F_NEXT; + cookie = cookie->pkt.next; + } + + start_dp[idx].flags &= ~VRING_DESC_F_NEXT; idx = start_dp[idx].next; txvq->vq_desc_head_idx = idx; if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) @@ -284,7 +295,7 @@ virtio_dev_vring_start(struct virtqueue *vq, int queue_type) error = virtqueue_enqueue_recv_refill(vq, m); if (error) { - rte_pktmbuf_free_seg(m); + rte_pktmbuf_free(m); break; } nbufs++; @@ -423,7 +434,7 @@ virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) error = virtqueue_enqueue_recv_refill(vq, m); if (unlikely(error)) { RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); - rte_pktmbuf_free_seg(m); + rte_pktmbuf_free(m); } } @@ -433,13 +444,13 @@ uint16_t virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) { struct virtqueue *rxvq = rx_queue; - struct virtio_hw *hw = rxvq->hw; struct rte_mbuf *rxm, *new_mbuf; uint16_t nb_used, num, nb_rx = 0; uint32_t len[VIRTIO_MBUF_BURST_SZ]; struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; int error; uint32_t i, nb_enqueued = 0; + const uint32_t hdr_size = sizeof(struct virtio_net_hdr); nb_used = VIRTQUEUE_NUSED(rxvq); @@ -460,8 +471,7 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); - if (unlikely(len[i] - < (uint32_t)hw->vtnet_hdr_size + ETHER_HDR_LEN)) { + if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { PMD_RX_LOG(ERR, "Packet drop"); nb_enqueued++; virtio_discard_rxbuf(rxvq, rxm); @@ -471,17 +481,16 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) rxm->pkt.in_port = rxvq->port_id; rxm->pkt.data = (char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM; + rxm->pkt.nb_segs = 1; rxm->pkt.next = NULL; - rxm->pkt.pkt_len = (uint32_t)(len[i] - - sizeof(struct virtio_net_hdr)); - rxm->pkt.data_len = (uint16_t)(len[i] - - sizeof(struct virtio_net_hdr)); + rxm->pkt.pkt_len = (uint32_t)(len[i] - hdr_size); + rxm->pkt.data_len = (uint16_t)(len[i] - hdr_size); VIRTIO_DUMP_PACKET(rxm, rxm->pkt.data_len); rx_pkts[nb_rx++] = rxm; - rxvq->bytes += len[i] - sizeof(struct virtio_net_hdr); + rxvq->bytes += rx_pkts[nb_rx - 1]->pkt.pkt_len; } rxvq->packets += nb_rx; @@ -498,11 +507,165 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) } error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf); if (unlikely(error)) { - rte_pktmbuf_free_seg(new_mbuf); + rte_pktmbuf_free(new_mbuf); break; } nb_enqueued++; } + + if (likely(nb_enqueued)) { + if (unlikely(virtqueue_kick_prepare(rxvq))) { + virtqueue_notify(rxvq); + PMD_RX_LOG(DEBUG, "Notified\n"); + } + } + + vq_update_avail_idx(rxvq); + + return nb_rx; +} + +uint16_t +virtio_recv_mergeable_pkts(void *rx_queue, + struct rte_mbuf **rx_pkts, + uint16_t nb_pkts) +{ + struct virtqueue *rxvq = rx_queue; + struct rte_mbuf *rxm, *new_mbuf; + uint16_t nb_used, num, nb_rx = 0; + uint32_t len[VIRTIO_MBUF_BURST_SZ]; + struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; + struct rte_mbuf *prev; + int error; + uint32_t i = 0, nb_enqueued = 0; + uint32_t seg_num = 0; + uint16_t extra_idx = 0; + uint32_t seg_res = 0; + const uint32_t hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); + + nb_used = VIRTQUEUE_NUSED(rxvq); + + rmb(); + + if (nb_used == 0) + return 0; + + PMD_RX_LOG(DEBUG, "used:%d\n", nb_used); + + while (i < nb_used) { + struct virtio_net_hdr_mrg_rxbuf *header; + + if (nb_rx == nb_pkts) + break; + + num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1); + if (num != 1) + continue; + + i++; + + PMD_RX_LOG(DEBUG, "dequeue:%d\n", num); + PMD_RX_LOG(DEBUG, "packet len:%d\n", len[0]); + + rxm = rcv_pkts[0]; + + if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) { + PMD_RX_LOG(ERR, "Packet drop\n"); + nb_enqueued++; + virtio_discard_rxbuf(rxvq, rxm); + rxvq->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->pkt.data = (char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM; + rxm->pkt.nb_segs = seg_num; + rxm->pkt.next = NULL; + rxm->pkt.pkt_len = (uint32_t)(len[0] - hdr_size); + rxm->pkt.data_len = (uint16_t)(len[0] - hdr_size); + + rxm->pkt.in_port = rxvq->port_id; + rx_pkts[nb_rx] = rxm; + prev = rxm; + + seg_res = seg_num - 1; + + while (seg_res != 0) { + /* + * Get extra segments for current uncompleted packet. + */ + uint32_t rcv_cnt = + RTE_MIN(seg_res, RTE_DIM(rcv_pkts)); + if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) { + uint32_t rx_num = + virtqueue_dequeue_burst_rx(rxvq, + rcv_pkts, len, rcv_cnt); + i += rx_num; + rcv_cnt = rx_num; + } else { + PMD_RX_LOG(ERR, + "No enough segments for packet.\n"); + nb_enqueued++; + virtio_discard_rxbuf(rxvq, rxm); + rxvq->errors++; + break; + } + + extra_idx = 0; + + while (extra_idx < rcv_cnt) { + rxm = rcv_pkts[extra_idx]; + + rxm->pkt.data = + (char *)rxm->buf_addr + + RTE_PKTMBUF_HEADROOM - hdr_size; + rxm->pkt.next = NULL; + rxm->pkt.pkt_len = (uint32_t)(len[extra_idx]); + rxm->pkt.data_len = (uint16_t)(len[extra_idx]); + + if (prev) + prev->pkt.next = rxm; + + prev = rxm; + rx_pkts[nb_rx]->pkt.pkt_len += rxm->pkt.pkt_len; + extra_idx++; + }; + seg_res -= rcv_cnt; + } + + VIRTIO_DUMP_PACKET(rx_pkts[nb_rx], + rx_pkts[nb_rx]->pkt.data_len); + + rxvq->bytes += rx_pkts[nb_rx]->pkt.pkt_len; + nb_rx++; + } + + rxvq->packets += nb_rx; + + /* Allocate new mbuf for the used descriptor */ + error = ENOSPC; + while (likely(!virtqueue_full(rxvq))) { + new_mbuf = rte_rxmbuf_alloc(rxvq->mpool); + if (unlikely(new_mbuf == NULL)) { + struct rte_eth_dev *dev + = &rte_eth_devices[rxvq->port_id]; + dev->data->rx_mbuf_alloc_failed++; + break; + } + error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf); + if (unlikely(error)) { + rte_pktmbuf_free(new_mbuf); + break; + } + nb_enqueued++; + } + if (likely(nb_enqueued)) { if (unlikely(virtqueue_kick_prepare(rxvq))) { virtqueue_notify(rxvq); @@ -536,12 +699,16 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) num = (uint16_t)(likely(nb_used < VIRTIO_MBUF_BURST_SZ) ? nb_used : VIRTIO_MBUF_BURST_SZ); while (nb_tx < nb_pkts) { - if (virtqueue_full(txvq) && num) { + int need = tx_pkts[nb_tx]->pkt.nb_segs - txvq->vq_free_cnt; + int deq_cnt = RTE_MIN(need, (int)num); + + num -= (deq_cnt > 0) ? deq_cnt : 0; + while (deq_cnt > 0) { virtqueue_dequeue_pkt_tx(txvq); - num--; + deq_cnt--; } - if (!virtqueue_full(txvq)) { + if (tx_pkts[nb_tx]->pkt.nb_segs <= txvq->vq_free_cnt) { txm = tx_pkts[nb_tx]; /* Enqueue Packet buffers */ error = virtqueue_enqueue_xmit(txvq, txm); @@ -555,7 +722,7 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) break; } nb_tx++; - txvq->bytes += txm->pkt.data_len; + txvq->bytes += txm->pkt.pkt_len; } else { PMD_TX_LOG(ERR, "No free tx descriptors to transmit"); break; -- 2.20.1