From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 04FB15A44 for ; Fri, 21 Sep 2018 12:34:21 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 6D598307D86F; Fri, 21 Sep 2018 10:34:20 +0000 (UTC) Received: from localhost (dhcp-192-209.str.redhat.com [10.33.192.209]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 300F94122; Fri, 21 Sep 2018 10:34:15 +0000 (UTC) From: Jens Freimann To: dev@dpdk.org Cc: tiwei.bie@intel.com, maxime.coquelin@redhat.com, Gavin.Hu@arm.com Date: Fri, 21 Sep 2018 12:33:05 +0200 Message-Id: <20180921103308.16357-9-jfreimann@redhat.com> In-Reply-To: <20180921103308.16357-1-jfreimann@redhat.com> References: <20180921103308.16357-1-jfreimann@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.48]); Fri, 21 Sep 2018 10:34:20 +0000 (UTC) Subject: [dpdk-dev] [PATCH v6 08/11] net/virtio: add support for mergeable buffers with packed virtqueues 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, 21 Sep 2018 10:34:21 -0000 Implement support for receiving merged buffers in virtio when packed virtqueues are enabled. Signed-off-by: Jens Freimann --- drivers/net/virtio/virtio_ethdev.c | 8 +- drivers/net/virtio/virtio_rxtx.c | 117 ++++++++++++++++++++++++++--- drivers/net/virtio/virtqueue.h | 1 + 3 files changed, 113 insertions(+), 13 deletions(-) diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c index f03cf04a9..c4ef095ed 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c @@ -1322,12 +1322,12 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev) { struct virtio_hw *hw = eth_dev->data->dev_private; - /* - * workarount for packed vqs which don't support - * mrg_rxbuf at this point - */ if (vtpci_packed_queue(hw)) { + if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) { + eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts; + } else { eth_dev->rx_pkt_burst = &virtio_recv_pkts_packed; + } } else if (hw->use_simple_rx) { PMD_INIT_LOG(INFO, "virtio: using simple Rx path on port %u", eth_dev->data->port_id); diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c index 90a0e306f..35c375cd5 100644 --- a/drivers/net/virtio/virtio_rxtx.c +++ b/drivers/net/virtio/virtio_rxtx.c @@ -90,6 +90,80 @@ vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx) dp->next = VQ_RING_DESC_CHAIN_END; } +static void +virtio_refill_packed(struct virtqueue *vq, uint16_t used_idx, + struct virtnet_rx *rxvq) +{ + struct vq_desc_extra *dxp; + struct vring_desc_packed *descs = vq->vq_ring.desc_packed; + struct vring_desc_packed *desc; + struct rte_mbuf *nmb; + + nmb = rte_mbuf_raw_alloc(rxvq->mpool); + if (unlikely(nmb == NULL)) { + struct rte_eth_dev *dev + = &rte_eth_devices[rxvq->port_id]; + dev->data->rx_mbuf_alloc_failed++; + return; + } + + desc = &descs[used_idx]; + + dxp = &vq->vq_descx[used_idx]; + + dxp->cookie = nmb; + dxp->ndescs = 1; + + desc->addr = VIRTIO_MBUF_ADDR(nmb, vq) + + RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size; + desc->len = nmb->buf_len - RTE_PKTMBUF_HEADROOM + + vq->hw->vtnet_hdr_size; + desc->flags |= VRING_DESC_F_WRITE; +} + +static uint16_t +virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq, + struct rte_mbuf **rx_pkts, + uint32_t *len, + uint16_t num, + struct virtnet_rx *rx_queue) +{ + struct rte_mbuf *cookie; + uint16_t used_idx; + uint16_t id; + struct vring_desc_packed *desc; + uint16_t i; + + for (i = 0; i < num; i++) { + used_idx = vq->vq_used_cons_idx; + desc = &vq->vq_ring.desc_packed[used_idx]; + if (!desc_is_used(desc, &vq->vq_ring)) + return i; + len[i] = desc->len; + id = desc[used_idx].index; + cookie = (struct rte_mbuf *)vq->vq_descx[id].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; + + virtio_refill_packed(vq, used_idx, rx_queue); + + if (++vq->vq_used_cons_idx >= vq->vq_nentries) { + vq->vq_used_cons_idx = 0; + vq->vq_ring.used_wrap_counter ^= 1; + } + vq->vq_descx[id].cookie = NULL; + } + + return i; +} + static uint16_t virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts, uint32_t *len, uint16_t num) @@ -1476,12 +1550,16 @@ virtio_recv_mergeable_pkts(void *rx_queue, uint16_t extra_idx; uint32_t seg_res; uint32_t hdr_size; + uint32_t rx_num = 0; nb_rx = 0; if (unlikely(hw->started == 0)) return nb_rx; - nb_used = VIRTQUEUE_NUSED(vq); + if (vtpci_packed_queue(vq->hw)) + nb_used = VIRTIO_MBUF_BURST_SZ; + else + nb_used = VIRTQUEUE_NUSED(vq); virtio_rmb(); @@ -1494,13 +1572,21 @@ virtio_recv_mergeable_pkts(void *rx_queue, seg_res = 0; hdr_size = hw->vtnet_hdr_size; + vq->vq_used_idx = vq->vq_used_cons_idx; + while (i < nb_used) { struct virtio_net_hdr_mrg_rxbuf *header; if (nb_rx == nb_pkts) break; - num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1); + if (vtpci_packed_queue(vq->hw)) + num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, + len, 1, (struct virtnet_rx *)rx_queue); + else + num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1); + if (num == 0) + return nb_rx; if (num != 1) continue; @@ -1552,12 +1638,15 @@ virtio_recv_mergeable_pkts(void *rx_queue, */ uint16_t rcv_cnt = RTE_MIN(seg_res, RTE_DIM(rcv_pkts)); - if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { - uint32_t rx_num = - virtqueue_dequeue_burst_rx(vq, - rcv_pkts, len, rcv_cnt); - i += rx_num; - rcv_cnt = rx_num; + if (vtpci_packed_queue(vq->hw)) { + if (likely(vq->vq_free_cnt >= rcv_cnt)) { + rx_num = virtqueue_dequeue_burst_rx_packed(vq, + rcv_pkts, len, rcv_cnt, + (struct virtnet_rx *)rx_queue); + } + } else if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { + rx_num = virtqueue_dequeue_burst_rx(vq, + rcv_pkts, len, rcv_cnt); } else { PMD_RX_LOG(ERR, "No enough segments for packet."); @@ -1566,6 +1655,8 @@ virtio_recv_mergeable_pkts(void *rx_queue, rxvq->stats.errors++; break; } + i += rx_num; + rcv_cnt = rx_num; extra_idx = 0; @@ -1599,6 +1690,15 @@ virtio_recv_mergeable_pkts(void *rx_queue, rxvq->stats.packets += nb_rx; + if (vtpci_packed_queue(vq->hw)) { + if (unlikely(virtqueue_kick_prepare_packed(vq)) && + likely(nb_rx)) { + virtqueue_notify(vq); + PMD_RX_LOG(DEBUG, "Notified"); + } + return nb_rx; + } + /* Allocate new mbuf for the used descriptor */ while (likely(!virtqueue_full(vq))) { new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); @@ -1618,7 +1718,6 @@ virtio_recv_mergeable_pkts(void *rx_queue, if (likely(nb_enqueued)) { vq_update_avail_idx(vq); - if (unlikely(virtqueue_kick_prepare(vq))) { virtqueue_notify(vq); PMD_RX_LOG(DEBUG, "Notified"); diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h index ffa2d8f92..15df6a050 100644 --- a/drivers/net/virtio/virtqueue.h +++ b/drivers/net/virtio/virtqueue.h @@ -171,6 +171,7 @@ struct virtqueue { * trails vq_ring.used->idx. */ uint16_t vq_used_cons_idx; + uint16_t vq_used_idx; uint16_t vq_nentries; /**< vring desc numbers */ uint16_t vq_free_cnt; /**< num of desc available */ uint16_t vq_avail_idx; /**< sync until needed */ -- 2.17.1