From d99088431ea5d6bb568c5cb5542688453084dcc6 Mon Sep 17 00:00:00 2001 From: Xueming Li Date: Wed, 14 Apr 2021 22:14:04 +0800 Subject: [PATCH] net/virtio: fix vectorized Rx queue rearm When Rx queue worked in vectorized mode and rxd <= 512, under traffic of high PPS rate, testpmd often start and receive packets of rxd without further growth. Testpmd started with rxq flush which tried to rx MAX_PKT_BURST(512) packets and drop. When Rx burst size >= Rx queue size, all descriptors in used queue consumed without rearm, device can't receive more packets. The next Rx burst returned at once since no used descriptors found, rearm logic was skipped, rx vq kept in starving state. To avoid rx vq starving, this patch always check the available queue, rearm if needed even no used descriptor reported by device. Fixes: fc3d66212fed ("virtio: add vector Rx") Fixes: 2d7c37194ee4 ("net/virtio: add NEON based Rx handler") Fixes: 52b5a707e6ca ("net/virtio: add Altivec Rx") Cc: stable@dpdk.org Signed-off-by: Xueming Li Reviewed-by: David Christensen Reviewed-by: Maxime Coquelin --- drivers/net/virtio/virtio_rxtx_simple_altivec.c | 12 ++++++------ drivers/net/virtio/virtio_rxtx_simple_neon.c | 12 ++++++------ drivers/net/virtio/virtio_rxtx_simple_sse.c | 12 ++++++------ 3 files changed, 18 insertions(+), 18 deletions(-) diff --git a/drivers/net/virtio/virtio_rxtx_simple_altivec.c b/drivers/net/virtio/virtio_rxtx_simple_altivec.c index 62e5100a48..7534974ef4 100644 --- a/drivers/net/virtio/virtio_rxtx_simple_altivec.c +++ b/drivers/net/virtio/virtio_rxtx_simple_altivec.c @@ -85,6 +85,12 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP)) return 0; + if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { + virtio_rxq_rearm_vec(rxvq); + if (unlikely(virtqueue_kick_prepare(vq))) + virtqueue_notify(vq); + } + nb_used = virtqueue_nused(vq); rte_compiler_barrier(); @@ -102,12 +108,6 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, rte_prefetch0(rused); - if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { - virtio_rxq_rearm_vec(rxvq); - if (unlikely(virtqueue_kick_prepare(vq))) - virtqueue_notify(vq); - } - nb_total = nb_used; ref_rx_pkts = rx_pkts; for (nb_pkts_received = 0; diff --git a/drivers/net/virtio/virtio_rxtx_simple_neon.c b/drivers/net/virtio/virtio_rxtx_simple_neon.c index c8e4b13a02..7fd92d1b0c 100644 --- a/drivers/net/virtio/virtio_rxtx_simple_neon.c +++ b/drivers/net/virtio/virtio_rxtx_simple_neon.c @@ -84,6 +84,12 @@ virtio_recv_pkts_vec(void *rx_queue, if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP)) return 0; + if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { + virtio_rxq_rearm_vec(rxvq); + if (unlikely(virtqueue_kick_prepare(vq))) + virtqueue_notify(vq); + } + /* virtqueue_nused has a load-acquire or rte_io_rmb inside */ nb_used = virtqueue_nused(vq); @@ -100,12 +106,6 @@ virtio_recv_pkts_vec(void *rx_queue, rte_prefetch_non_temporal(rused); - if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { - virtio_rxq_rearm_vec(rxvq); - if (unlikely(virtqueue_kick_prepare(vq))) - virtqueue_notify(vq); - } - nb_total = nb_used; ref_rx_pkts = rx_pkts; for (nb_pkts_received = 0; diff --git a/drivers/net/virtio/virtio_rxtx_simple_sse.c b/drivers/net/virtio/virtio_rxtx_simple_sse.c index ff4eba33d6..7577f5e86d 100644 --- a/drivers/net/virtio/virtio_rxtx_simple_sse.c +++ b/drivers/net/virtio/virtio_rxtx_simple_sse.c @@ -85,6 +85,12 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP)) return 0; + if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { + virtio_rxq_rearm_vec(rxvq); + if (unlikely(virtqueue_kick_prepare(vq))) + virtqueue_notify(vq); + } + nb_used = virtqueue_nused(vq); if (unlikely(nb_used == 0)) @@ -100,12 +106,6 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, rte_prefetch0(rused); - if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { - virtio_rxq_rearm_vec(rxvq); - if (unlikely(virtqueue_kick_prepare(vq))) - virtqueue_notify(vq); - } - nb_total = nb_used; ref_rx_pkts = rx_pkts; for (nb_pkts_received = 0; -- 2.20.1