netdev - [PATCH net] net: veth: fix packet segmentation in veth_convert_skb_to_xdp

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Message-ID: <eddfe549e7e626870071930964ac3c38a1dc8068.1701702000.git.lorenzo@kernel.org>
Date: Mon,  4 Dec 2023 16:01:48 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	lorenzo.bianconi@...hat.com,
	linyunsheng@...wei.com,
	alexander.duyck@...il.com,
	aleksander.lobakin@...el.com,
	liangchen.linux@...il.com
Subject: [PATCH net] net: veth: fix packet segmentation in veth_convert_skb_to_xdp_buff

Based on the previous allocated packet, page_offset can be not null
in veth_convert_skb_to_xdp_buff routine.
Take into account page fragment offset during the skb paged area copy
in veth_convert_skb_to_xdp_buff().

Fixes: 2d0de67da51a ("net: veth: use newly added page pool API for veth with xdp")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/veth.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 57efb3454c57..977861c46b1f 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -790,7 +790,8 @@ static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq,
 
 			skb_add_rx_frag(nskb, i, page, page_offset, size,
 					truesize);
-			if (skb_copy_bits(skb, off, page_address(page),
+			if (skb_copy_bits(skb, off,
+					  page_address(page) + page_offset,
 					  size)) {
 				consume_skb(nskb);
 				goto drop;
-- 
2.43.0