[NET]: Add NETIF_F_GEN_CSUM and NETIF_F_ALL_CSUM

The current stack treats NETIF_F_HW_CSUM and NETIF_F_NO_CSUM
identically so we test for them in quite a few places.  For the sake
of brevity, I'm adding the macro NETIF_F_GEN_CSUM for these two.  We
also test the disjunct of NETIF_F_IP_CSUM and the other two in various
places, for that purpose I've added NETIF_F_ALL_CSUM.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -1199,8 +1199,7 @@ int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
 }
 
 #define BOND_INTERSECT_FEATURES \
-	(NETIF_F_SG|NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM|\
-	NETIF_F_TSO|NETIF_F_UFO)
+	(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_TSO | NETIF_F_UFO)
 
 /* 
  * Compute the common dev->feature set available to all slaves.  Some
@@ -1218,9 +1217,7 @@ static int bond_compute_features(struct bonding *bond)
 		features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
 
 	if ((features & NETIF_F_SG) && 
-	    !(features & (NETIF_F_IP_CSUM |
-			  NETIF_F_NO_CSUM |
-			  NETIF_F_HW_CSUM)))
+	    !(features & NETIF_F_ALL_CSUM))
 		features &= ~NETIF_F_SG;
 
 	/* 

include/linux/netdevice.h

@@ -312,6 +312,9 @@ struct net_device
 #define NETIF_F_LLTX		4096	/* LockLess TX */
 #define NETIF_F_UFO             8192    /* Can offload UDP Large Send*/
 
+#define NETIF_F_GEN_CSUM	(NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
+#define NETIF_F_ALL_CSUM	(NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
+
 	struct net_device	*next_sched;
 
 	/* Interface index. Unique device identifier	*/

net/bridge/br_if.c

@@ -376,8 +376,7 @@ void br_features_recompute(struct net_bridge *br)
 	checksum = br->feature_mask & NETIF_F_IP_CSUM;
 
 	list_for_each_entry(p, &br->port_list, list) {
-		if (!(p->dev->features 
-		      & (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM)))
+		if (!(p->dev->features & NETIF_F_ALL_CSUM))
 			checksum = 0;
 		features &= p->dev->features;
 	}

net/core/dev.c

@@ -1284,7 +1284,7 @@ int dev_queue_xmit(struct sk_buff *skb)
 	 * checksumming for this protocol, complete checksumming here.
 	 */
 	if (skb->ip_summed == CHECKSUM_HW &&
-	    (!(dev->features & (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)) &&
+	    (!(dev->features & NETIF_F_GEN_CSUM) &&
 	     (!(dev->features & NETIF_F_IP_CSUM) ||
 	      skb->protocol != htons(ETH_P_IP))))
 	      	if (skb_checksum_help(skb, 0))
@@ -2789,9 +2789,7 @@ int register_netdevice(struct net_device *dev)
 
 	/* Fix illegal SG+CSUM combinations. */
 	if ((dev->features & NETIF_F_SG) &&
-	    !(dev->features & (NETIF_F_IP_CSUM |
-			       NETIF_F_NO_CSUM |
-			       NETIF_F_HW_CSUM))) {
+	    !(dev->features & NETIF_F_ALL_CSUM)) {
 		printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
 		       dev->name);
 		dev->features &= ~NETIF_F_SG;

net/core/ethtool.c

@@ -30,7 +30,7 @@ u32 ethtool_op_get_link(struct net_device *dev)
 
 u32 ethtool_op_get_tx_csum(struct net_device *dev)
 {
-	return (dev->features & (NETIF_F_IP_CSUM | NETIF_F_HW_CSUM)) != 0;
+	return (dev->features & NETIF_F_ALL_CSUM) != 0;
 }
 
 int ethtool_op_set_tx_csum(struct net_device *dev, u32 data)
@@ -551,9 +551,7 @@ static int ethtool_set_sg(struct net_device *dev, char __user *useraddr)
 		return -EFAULT;
 
 	if (edata.data && 
-	    !(dev->features & (NETIF_F_IP_CSUM |
-			       NETIF_F_NO_CSUM |
-			       NETIF_F_HW_CSUM)))
+	    !(dev->features & NETIF_F_ALL_CSUM))
 		return -EINVAL;
 
 	return __ethtool_set_sg(dev, edata.data);

net/ipv4/ip_output.c

@@ -840,7 +840,7 @@ int ip_append_data(struct sock *sk,
 	 */
 	if (transhdrlen &&
 	    length + fragheaderlen <= mtu &&
-	    rt->u.dst.dev->features&(NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM) &&
+	    rt->u.dst.dev->features & NETIF_F_ALL_CSUM &&
 	    !exthdrlen)
 		csummode = CHECKSUM_HW;
 

net/ipv4/tcp.c

@@ -622,14 +622,10 @@ ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset,
 	ssize_t res;
 	struct sock *sk = sock->sk;
 
-#define TCP_ZC_CSUM_FLAGS (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
-
 	if (!(sk->sk_route_caps & NETIF_F_SG) ||
-	    !(sk->sk_route_caps & TCP_ZC_CSUM_FLAGS))
+	    !(sk->sk_route_caps & NETIF_F_ALL_CSUM))
 		return sock_no_sendpage(sock, page, offset, size, flags);
 
-#undef TCP_ZC_CSUM_FLAGS
-
 	lock_sock(sk);
 	TCP_CHECK_TIMER(sk);
 	res = do_tcp_sendpages(sk, &page, offset, size, flags);
@@ -726,9 +722,7 @@ int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 				/*
 				 * Check whether we can use HW checksum.
 				 */
-				if (sk->sk_route_caps &
-				    (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM |
-				     NETIF_F_HW_CSUM))
+				if (sk->sk_route_caps & NETIF_F_ALL_CSUM)
 					skb->ip_summed = CHECKSUM_HW;
 
 				skb_entail(sk, tp, skb);