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veth: Allow jumbo frames in xdp mode

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Allow increasing the MTU over page boundaries on veth devices
if the attached xdp program declares to support xdp fragments.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/d5dc039c3d4123426e7023a488c449181a7bc57f.1646989407.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi 2022-03-11 10:14:20 +01:00 committed by Daniel Borkmann
parent 718a18a0c8
commit 7cda76d858
1 changed files with 8 additions and 3 deletions
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11
drivers/net/veth.c
View file

@ -1528,9 +1528,14 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog,
goto err;
}
max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM -
peer->hard_header_len -
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
max_mtu = SKB_WITH_OVERHEAD(PAGE_SIZE - VETH_XDP_HEADROOM) -
peer->hard_header_len;
/* Allow increasing the max_mtu if the program supports
* XDP fragments.
*/
if (prog->aux->xdp_has_frags)
max_mtu += PAGE_SIZE * MAX_SKB_FRAGS;
if (peer->mtu > max_mtu) {
NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP");
err = -ERANGE;