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Date: Sat, 16 Jan 2021 13:59:17 +0800 From: Xin Long <lucien.xin@...il.com> To: network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org Cc: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>, Neil Horman <nhorman@...driver.com>, davem@...emloft.net, Jakub Kicinski <kuba@...nel.org>, Alexander Duyck <alexander.duyck@...il.com> Subject: [PATCH net-next] 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 <lucien.xin@...il.com> --- 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 ff39e94..1168d18 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 -- 2.1.0
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