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udp_vu: update segment size

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In udp_vu_sock_recv(), collect a segment with a size defined to
IP_MAX_MTU + ETH_HLEN + sizeof(struct virtio_net_hdr_mrg_rxbuf)

The original version double counted the IP header: IP_MAX_MTU includes
the IP header, and so did hdrlen.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Laurent Vivier 2024-12-05 08:37:18 +01:00 committed by Stefano Brivio
parent 190829705e
commit 8996d183c5
1 changed files with 2 additions and 1 deletions
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3
udp_vu.c
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@ -104,7 +104,8 @@ static int udp_vu_sock_recv(const struct ctx *c, int s, uint32_t events,
vu_init_elem(elem, iov_vu, VIRTQUEUE_MAX_SIZE);
iov_cnt = vu_collect(vdev, vq, elem, VIRTQUEUE_MAX_SIZE,
IP_MAX_MTU - sizeof(struct udphdr) + hdrlen,
IP_MAX_MTU + ETH_HLEN +
sizeof(struct virtio_net_hdr_mrg_rxbuf),
NULL);
if (iov_cnt == 0)
return 0;