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From: Jason Wang <jasowang@redhat.com>
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Date: Fri, 25 Sep 2015 13:21:30 +0800
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Subject: [PATCH] virtio-net: correctly drop truncated packets
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When packet is truncated during receiving, we drop the packets but
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neither discard the descriptor nor add and signal used
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descriptor. This will lead several issues:
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- sg mappings are leaked
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- rx will be stalled if a lots of packets were truncated
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In order to be consistent with vhost, fix by discarding the descriptor
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in this case.
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Cc: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 0cf33fb6b49a19de32859e2cdc6021334f448fb3)
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---
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hw/net/virtio-net.c | 8 +-------
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1 file changed, 1 insertion(+), 7 deletions(-)
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diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
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index 1510839..775389b 100644
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--- a/hw/net/virtio-net.c
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+++ b/hw/net/virtio-net.c
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@@ -1086,13 +1086,7 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
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* must have consumed the complete packet.
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* Otherwise, drop it. */
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if (!n->mergeable_rx_bufs && offset < size) {
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-#if 0
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- error_report("virtio-net truncated non-mergeable packet: "
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- "i %zd mergeable %d offset %zd, size %zd, "
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- "guest hdr len %zd, host hdr len %zd",
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- i, n->mergeable_rx_bufs,
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- offset, size, n->guest_hdr_len, n->host_hdr_len);
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-#endif
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+ virtqueue_discard(q->rx_vq, &elem, total);
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return size;
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}
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