From: Tom Herbert <therbert@google.com>
Date: Tue, 4 Nov 2014 17:06:56 +0000 (-0800)
Subject: gue: TX support for using remote checksum offload option
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~122^2~274^2~1
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b17f709a24013fcbb257f6f89b4d81ac9fdf0d18;p=pandora-kernel.git

gue: TX support for using remote checksum offload option

Add if_tunnel flag TUNNEL_ENCAP_FLAG_REMCSUM to configure
remote checksum offload on an IP tunnel. Add logic in gue_build_header
to insert remote checksum offload option.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/net/fou.h b/include/net/fou.h
index cf4ce8874f92..25b26ffcf1df 100644
--- a/include/net/fou.h
+++ b/include/net/fou.h
@@ -20,7 +20,19 @@ static size_t fou_encap_hlen(struct ip_tunnel_encap *e)
 
 static size_t gue_encap_hlen(struct ip_tunnel_encap *e)
 {
-	return sizeof(struct udphdr) + sizeof(struct guehdr);
+	size_t len;
+	bool need_priv = false;
+
+	len = sizeof(struct udphdr) + sizeof(struct guehdr);
+
+	if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) {
+		len += GUE_PLEN_REMCSUM;
+		need_priv = true;
+	}
+
+	len += need_priv ? GUE_LEN_PRIV : 0;
+
+	return len;
 }
 
 #endif
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