On 2016年11月30日 21:40, Michael S. Tsirkin wrote:
On Wed, Nov 30, 2016 at 08:10:57PM +0800, Yunjian Wang wrote:
When we meet an error(err=-EBADFD) recvmsg,
How do you get EBADFD? Won't vhost_net_rx_peek_head_len
return 0 in this case, breaking the loop?
the error handling in vhost
handle_rx() will continue. This will cause a soft CPU lockup in vhost thread.
Signed-off-by: Yunjian Wang <wangyunj...@huawei.com>
---
drivers/vhost/net.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 5dc128a..edc470b 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -717,6 +717,9 @@ static void handle_rx(struct vhost_net *net)
pr_debug("Discarded rx packet: "
" len %d, expected %zd\n", err, sock_len);
vhost_discard_vq_desc(vq, headcount);
+ /* Don't continue to do, when meet errors. */
+ if (err < 0)
+ goto out;
You might get e.g. EAGAIN and I think you need to retry
in this case.
Yes.
continue;
}
/* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */
--
1.9.5.msysgit.1
