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virtio_net: suppress cpu stall when free_unused_bufs

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[ Upstream commit f8bb5104394560e29017c25bcade4c6b7aabd108 ]

For multi-queue and large ring-size use case, the following error
occurred when free_unused_bufs:
rcu: INFO: rcu_sched self-detected stall on CPU.

Fixes: 986a4f4d45 ("virtio_net: multiqueue support")
Signed-off-by: Wenliang Wang <wangwenliang.1995@bytedance.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wenliang Wang
2023-05-04 10:27:06 +08:00
committed by Greg Kroah-Hartman
parent c043714ef2
commit b6b15de512
1 changed files with 2 additions and 0 deletions
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2
drivers/net/virtio_net.c
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@@ -2777,12 +2777,14 @@ static void free_unused_bufs(struct virtnet_info *vi)
struct virtqueue *vq = vi->sq[i].vq; struct virtqueue *vq = vi->sq[i].vq;
while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
virtnet_sq_free_unused_buf(vq, buf); virtnet_sq_free_unused_buf(vq, buf);
cond_resched();
} }
for (i = 0; i < vi->max_queue_pairs; i++) { for (i = 0; i < vi->max_queue_pairs; i++) {
struct virtqueue *vq = vi->rq[i].vq; struct virtqueue *vq = vi->rq[i].vq;
while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
virtnet_rq_free_unused_buf(vq, buf); virtnet_rq_free_unused_buf(vq, buf);
cond_resched();
} }
} }