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From 7cda76d858a4e71ac4a04066c093679a12e1312c Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
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 <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
---
drivers/net/veth.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1473,9 +1473,14 @@ 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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