From 4eb5d4a5b4d64bb9495141b2f323caf7524ef8a6 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Sat, 16 Jan 2021 13:59:17 +0800 Subject: [PATCH] udp: not remove the CRC flag from dev features when need_csum is false In __skb_udp_tunnel_segment(), when it's a SCTP over VxLAN/GENEVE packet and need_csum is false, which means the outer udp checksum doesn't need to be computed, csum_start and csum_offset could be used by the inner SCTP CRC CSUM for SCTP HW CRC offload. So this patch is to not remove the CRC flag from dev features when need_csum is false. Signed-off-by: Xin Long Link: https://lore.kernel.org/r/1e81b700642498546eaa3f298e023fd7ad394f85.1610776757.git.lucien.xin@gmail.com Signed-off-by: Jakub Kicinski --- net/ipv4/udp_offload.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index ff39e94781bf..1168d186cc43 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -68,8 +68,8 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb, (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)))); features &= skb->dev->hw_enc_features; - /* CRC checksum can't be handled by HW when it's a UDP tunneling packet. */ - features &= ~NETIF_F_SCTP_CRC; + if (need_csum) + features &= ~NETIF_F_SCTP_CRC; /* The only checksum offload we care about from here on out is the * outer one so strip the existing checksum feature flags and