[PATCH vhost 08/22] virtio_net: virtnet_poll_tx support rescheduled
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2023-10-11 09:27:42
Also in:
bpf, virtualization
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
virtnet_poll_tx() support to return budget when busy to be rescheduled. When retval < budget, napi_poll() in dev.c will exit directly. And virtqueue_napi_complete() will be called to close napi. When retval == budget, 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> --- drivers/net/virtio/main.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
index bcfd31a55076..f32cfa189972 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c@@ -1976,6 +1976,7 @@ 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 busy = 0; int opaque; bool done;
@@ -1993,6 +1994,11 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget) if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) netif_tx_wake_queue(txq); + if (busy) { + __netif_tx_unlock(txq); + return budget; + } + opaque = virtqueue_enable_cb_prepare(sq->vq); done = napi_complete_done(napi, 0);
--
2.32.0.3.g01195cf9f