From: Jason Wang <jasowang@redhat.com>
To: Xuan Zhuo <xuanzhuo@linux.alibaba.com>, netdev@vger.kernel.org
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
"Jakub Kicinski" <kuba@kernel.org>,
"Björn Töpel" <bjorn@kernel.org>,
"Magnus Karlsson" <magnus.karlsson@intel.com>,
"Jonathan Lemon" <jonathan.lemon@gmail.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"John Fastabend" <john.fastabend@gmail.com>,
virtualization@lists.linux-foundation.org, bpf@vger.kernel.org,
"dust . li" <dust.li@linux.alibaba.com>
Subject: Re: [PATCH net-next v4 07/10] virtio-net: virtnet_poll_tx support budget check
Date: Wed, 14 Apr 2021 11:34:07 +0800 [thread overview]
Message-ID: <ad27f0b5-713f-f6f3-ba51-0468db9897ca@redhat.com> (raw)
In-Reply-To: <20210413031523.73507-8-xuanzhuo@linux.alibaba.com>
在 2021/4/13 上午11:15, Xuan Zhuo 写道:
> virtnet_poll_tx() check the work done like other network card drivers.
>
> When work < budget, napi_poll() in dev.c will exit directly. And
> virtqueue_napi_complete() will be called to close napi. If closing napi
> fails or there is still data to be processed, virtqueue_napi_complete()
> will make napi schedule again, and no conflicts with the logic of
> napi_poll().
>
> When work == budget, virtnet_poll_tx() will return the var 'work', and
> the napi_poll() in dev.c will re-add napi to the queue.
>
> The purpose of this patch is to support xsk xmit in virtio_poll_tx for
> subsequent patch.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
> ---
> drivers/net/virtio_net.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index f3752b254965..f52a25091322 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1529,6 +1529,7 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> struct virtnet_info *vi = sq->vq->vdev->priv;
> unsigned int index = vq2txq(sq->vq);
> struct netdev_queue *txq;
> + int work_done = 0;
>
> if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
> /* We don't need to enable cb for XDP */
> @@ -1541,12 +1542,13 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> free_old_xmit(sq, true);
> __netif_tx_unlock(txq);
>
> - virtqueue_napi_complete(napi, sq->vq, 0);
> + if (work_done < budget)
> + virtqueue_napi_complete(napi, sq->vq, 0);
>
> if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
> netif_tx_wake_queue(txq);
>
> - return 0;
> + return work_done;
> }
>
> static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
next prev parent reply other threads:[~2021-04-14 3:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 3:15 [PATCH net-next v4 00/10] virtio-net support xdp socket zero copy xmit Xuan Zhuo
2021-04-13 3:15 ` [PATCH net-next v4 01/10] netdevice: priv_flags extend to 64bit Xuan Zhuo
2021-04-13 18:26 ` Jakub Kicinski
2021-04-13 3:15 ` [PATCH net-next v4 02/10] netdevice: add priv_flags IFF_NOT_USE_DMA_ADDR Xuan Zhuo
2021-04-13 3:15 ` [PATCH net-next v4 03/10] virtio-net: " Xuan Zhuo
2021-04-13 3:15 ` [PATCH net-next v4 04/10] xsk: support get page by addr Xuan Zhuo
2021-04-14 6:59 ` Magnus Karlsson
2021-04-13 3:15 ` [PATCH net-next v4 05/10] xsk: XDP_SETUP_XSK_POOL support option IFF_NOT_USE_DMA_ADDR Xuan Zhuo
2021-04-14 7:00 ` Magnus Karlsson
2021-04-13 3:15 ` [PATCH net-next v4 06/10] virtio-net: unify the code for recycling the xmit ptr Xuan Zhuo
2021-04-14 3:32 ` Jason Wang
2021-04-13 3:15 ` [PATCH net-next v4 07/10] virtio-net: virtnet_poll_tx support budget check Xuan Zhuo
2021-04-14 3:34 ` Jason Wang [this message]
2021-04-13 3:15 ` [PATCH net-next v4 08/10] virtio-net: xsk zero copy xmit setup Xuan Zhuo
2021-04-14 4:01 ` Jason Wang
2021-04-14 7:36 ` Magnus Karlsson
2021-04-14 7:51 ` Jason Wang
2021-04-13 3:15 ` [PATCH net-next v4 09/10] virtio-net: xsk zero copy xmit implement wakeup and xmit Xuan Zhuo
2021-04-14 5:46 ` Jason Wang
2021-04-13 3:15 ` [PATCH net-next v4 10/10] virtio-net: xsk zero copy xmit kick by threshold Xuan Zhuo
2021-04-14 5:51 ` Jason Wang
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