commit c8cd0989bd151fda87bbf10887b3df18021284bc
author Tom Herbert <tom@herbertland.com> Mon Dec 14 11:19:44 2015 -0800
committer David S. Miller <davem@davemloft.net> Tue Dec 15 16:50:20 2015 -0500
tree 714a0169000dfa3c7456e69b58da887159b71586
parent a188222b6ed29404ac2d4232d35d1fe0e77af370

net: Eliminate NETIF_F_GEN_CSUM and NETIF_F_V[46]_CSUM

These netif flags are unnecessary convolutions. It is more
straightforward to just use NETIF_F_HW_CSUM, NETIF_F_IP_CSUM,
and NETIF_F_IPV6_CSUM directly.

This patch also:
    - Cleans up can_checksum_protocol
    - Simplifies netdev_intersect_features

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

net/ipv4/ip_output.c

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index e0b94cd..568e2bc 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -911,7 +911,7 @@
 	 */
 	if (transhdrlen &&
 	    length + fragheaderlen <= mtu &&
-	    rt->dst.dev->features & NETIF_F_V4_CSUM &&
+	    rt->dst.dev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM) &&
 	    !(flags & MSG_MORE) &&
 	    !exthdrlen)
 		csummode = CHECKSUM_PARTIAL;

net/ipv4/netfilter/nf_nat_l3proto_ipv4.c

diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
index 5075b7e..61c7cc2 100644
--- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
@@ -132,7 +132,8 @@
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL) {
 		if (!(rt->rt_flags & RTCF_LOCAL) &&
-		    (!skb->dev || skb->dev->features & NETIF_F_V4_CSUM)) {
+		    (!skb->dev || skb->dev->features &
+		     (NETIF_F_IP_CSUM | NETIF_F_HW_CSUM))) {
 			skb->ip_summed = CHECKSUM_PARTIAL;
 			skb->csum_start = skb_headroom(skb) +
 					  skb_network_offset(skb) +

net/ipv4/udp.c

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 0c7b0e6..8841e98 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -772,7 +772,8 @@
 	else if (skb_is_gso(skb))
 		uh->check = ~udp_v4_check(len, saddr, daddr, 0);
 	else if (skb_dst(skb) && skb_dst(skb)->dev &&
-		 (skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) {
+		 (skb_dst(skb)->dev->features &
+		  (NETIF_F_IP_CSUM | NETIF_F_HW_CSUM))) {
 
 		BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
 

net/ipv4/udp_offload.c

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index f938616..1300426 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -60,8 +60,9 @@
 
 	/* Try to offload checksum if possible */
 	offload_csum = !!(need_csum &&
-			  (skb->dev->features &
-			   (is_ipv6 ? NETIF_F_V6_CSUM : NETIF_F_V4_CSUM)));
+			  ((skb->dev->features & NETIF_F_HW_CSUM) ||
+			   (skb->dev->features & (is_ipv6 ?
+			    NETIF_F_IPV6_CSUM : NETIF_F_IP_CSUM))));
 
 	/* segment inner packet. */
 	enc_features = skb->dev->hw_enc_features & features;