diff options
| author | Lorenzo Bianconi <lorenzo@kernel.org> | 2022-03-11 10:14:20 +0100 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-03-17 20:33:52 +0100 |
| commit | 7cda76d858a4e71ac4a04066c093679a12e1312c (patch) | |
| tree | 8b45b5a36f9002c3f72ee2f5e778fd1d99837f4b /drivers/net | |
| parent | 718a18a0c8a67f97781e40bdef7cdd055c430996 (diff) | |
veth: Allow jumbo frames in xdp mode
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
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/veth.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/net/veth.c b/drivers/net/veth.c index bfae15ec902b..1b5714926d81 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -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; |