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- From 7cda76d858a4e71ac4a04066c093679a12e1312c Mon Sep 17 00:00:00 2001
- From: Lorenzo Bianconi <[email protected]>
- Date: Fri, 11 Mar 2022 10:14:20 +0100
- Subject: [PATCH] veth: Allow jumbo frames in xdp mode
- MIME-Version: 1.0
- Content-Type: text/plain; charset=UTF-8
- Content-Transfer-Encoding: 8bit
- 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 <[email protected]>
- Signed-off-by: Daniel Borkmann <[email protected]>
- Acked-by: Toke Høiland-Jørgensen <[email protected]>
- Acked-by: John Fastabend <[email protected]>
- Link: https://lore.kernel.org/bpf/d5dc039c3d4123426e7023a488c449181a7bc57f.1646989407.git.lorenzo@kernel.org
- ---
- drivers/net/veth.c | 11 ++++++++---
- 1 file changed, 8 insertions(+), 3 deletions(-)
- --- a/drivers/net/veth.c
- +++ b/drivers/net/veth.c
- @@ -1455,9 +1455,14 @@ static int veth_xdp_set(struct net_devic
- 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;
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