netdev - [net] udp: enable UDP checksum offload for ESP

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Message-Id: <20180412190315.3102-1-jacek.kalwas@intel.com>
Date:   Thu, 12 Apr 2018 12:03:13 -0700
From:   Jacek Kalwas <jacek.kalwas@...el.com>
To:     davem@...emloft.net
Cc:     Jacek Kalwas <jacek.kalwas@...el.com>, netdev@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org
Subject: [net] udp: enable UDP checksum offload for ESP

In case NIC has support for ESP TX CSUM offload skb->ip_summed is not
set to CHECKSUM_PARTIAL which results in checksum calculated by SW.

Fix enables ESP TX CSUM for UDP by extending condition with check for
NETIF_F_HW_ESP_TX_CSUM.

Signed-off-by: Jacek Kalwas <jacek.kalwas@...el.com>
---
 net/ipv4/ip_output.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 4c11b810a447..a2dfb5a9ba76 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -907,7 +907,7 @@ static int __ip_append_data(struct sock *sk,
 	    length + fragheaderlen <= mtu &&
 	    rt->dst.dev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM) &&
 	    !(flags & MSG_MORE) &&
-	    !exthdrlen)
+	    (!exthdrlen || (rt->dst.dev->features & NETIF_F_HW_ESP_TX_CSUM)))
 		csummode = CHECKSUM_PARTIAL;

 	cork->length += length;
-- 
2.14.3

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