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| author |   Mao Wenan <wenan.mao@linux.alibaba.com> | 2020-08-02 15:44:09 +0800 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2020-08-05 11:08:41 -0400 |
| commit | 481a0d7422db26fb63e2d64f0652667a5c6d0f3e (patch) | |
| tree | 6e49aa0f8afb2fa31add1737fb04e899f81c1186 /drivers/vhost/vdpa.c | |
| parent | virtio_net: use LE accessors for speed/duplex (diff) | |
| download | linux-dev-481a0d7422db26fb63e2d64f0652667a5c6d0f3e.tar.xz linux-dev-481a0d7422db26fb63e2d64f0652667a5c6d0f3e.zip | |
virtio_ring: Avoid loop when vq is broken in virtqueue_poll
The loop may exist if vq->broken is true,
virtqueue_get_buf_ctx_packed or virtqueue_get_buf_ctx_split
will return NULL, so virtnet_poll will reschedule napi to
receive packet, it will lead cpu usage(si) to 100%.
call trace as below:
virtnet_poll
virtnet_receive
virtqueue_get_buf_ctx
virtqueue_get_buf_ctx_packed
virtqueue_get_buf_ctx_split
virtqueue_napi_complete
virtqueue_poll //return true
virtqueue_napi_schedule //it will reschedule napi
to fix this, return false if vq is broken in virtqueue_poll.
Signed-off-by: Mao Wenan <wenan.mao@linux.alibaba.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/1596354249-96204-1-git-send-email-wenan.mao@linux.alibaba.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'drivers/vhost/vdpa.c')
0 files changed, 0 insertions, 0 deletions