[dpdk-dev] [PATCH] net/virtio: fix vectorized Rx queue stuck
Xueming(Steven) Li
xuemingl at nvidia.com
Wed Apr 14 08:11:05 CEST 2021
+@谢华伟(此时此刻) <huawei.xhw at alibaba-inc.com>
> -----Original Message-----
> From: Xueming Li <xuemingl at nvidia.com>
> Sent: Wednesday, April 14, 2021 12:27 PM
> Cc: dev at dpdk.org; Xueming(Steven) Li <xuemingl at nvidia.com>; huawei.xie at intel.com; jerin.jacob at caviumnetworks.com;
> drc at linux.vnet.ibm.com; stable at dpdk.org; Maxime Coquelin <maxime.coquelin at redhat.com>; Chenbo Xia <chenbo.xia at intel.com>;
> Jerin Jacob <jerinj at marvell.com>; Ruifeng Wang <ruifeng.wang at arm.com>; Bruce Richardson <bruce.richardson at intel.com>;
> Konstantin Ananyev <konstantin.ananyev at intel.com>; Jianfeng Tan <jianfeng.tan at intel.com>; Jianbo Liu <jianbo.liu at linaro.org>;
> Yuanhan Liu <yuanhan.liu at linux.intel.com>
> Subject: [PATCH] net/virtio: fix vectorized Rx queue stuck
>
> When Rx burst size >= Rx queue size, all descriptors in used queue consumed without rearm, the next Rx burst found no new packets
> and returned directly without rearm as well.
>
> This patch rearms available queue at once after rx_burst to avoid vq hungry.
>
> Fixes: fc3d66212fed ("virtio: add vector Rx")
> Cc: huawei.xie at intel.com
> Fixes: 2d7c37194ee4 ("net/virtio: add NEON based Rx handler")
> Cc: jerin.jacob at caviumnetworks.com
> Fixes: 52b5a707e6ca ("net/virtio: add Altivec Rx")
> Cc: drc at linux.vnet.ibm.com
> Cc: stable at dpdk.org
>
> Signed-off-by: Xueming Li <xuemingl at nvidia.com>
> ---
> 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..1ffae234da 100644
> --- a/drivers/net/virtio/virtio_rxtx_simple_altivec.c
> +++ b/drivers/net/virtio/virtio_rxtx_simple_altivec.c
> @@ -102,12 +102,6 @@ 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;
> @@ -204,5 +198,11 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
> for (nb_used = 0; nb_used < nb_pkts_received; nb_used++)
> virtio_update_packet_stats(&rxvq->stats, ref_rx_pkts[nb_used]);
>
> + 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);
> + }
> +
> return nb_pkts_received;
> }
> diff --git a/drivers/net/virtio/virtio_rxtx_simple_neon.c b/drivers/net/virtio/virtio_rxtx_simple_neon.c
> index c8e4b13a02..341dedce41 100644
> --- a/drivers/net/virtio/virtio_rxtx_simple_neon.c
> +++ b/drivers/net/virtio/virtio_rxtx_simple_neon.c
> @@ -100,12 +100,6 @@ 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;
> @@ -210,5 +204,11 @@ virtio_recv_pkts_vec(void *rx_queue,
> for (nb_used = 0; nb_used < nb_pkts_received; nb_used++)
> virtio_update_packet_stats(&rxvq->stats, ref_rx_pkts[nb_used]);
>
> + 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);
> + }
> +
> return nb_pkts_received;
> }
> diff --git a/drivers/net/virtio/virtio_rxtx_simple_sse.c b/drivers/net/virtio/virtio_rxtx_simple_sse.c
> index ff4eba33d6..2e17f9d1f2 100644
> --- a/drivers/net/virtio/virtio_rxtx_simple_sse.c
> +++ b/drivers/net/virtio/virtio_rxtx_simple_sse.c
> @@ -100,12 +100,6 @@ 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;
> @@ -194,5 +188,11 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
> for (nb_used = 0; nb_used < nb_pkts_received; nb_used++)
> virtio_update_packet_stats(&rxvq->stats, ref_rx_pkts[nb_used]);
>
> + 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);
> + }
> +
> return nb_pkts_received;
> }
> --
> 2.25.1
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