[BRIDGE]: Add support for NETIF_F_HW_CSUM devices

As it is the bridge will only ever declare NETIF_F_IP_CSUM even if all
its constituent devices support NETIF_F_HW_CSUM.  This patch fixes
this by supporting the first one out of NETIF_F_NO_CSUM,
NETIF_F_HW_CSUM, and NETIF_F_IP_CSUM that is supported by all
constituent devices.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 12 insertions, 6 deletions

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 0c88a2ac32c1..2afdc7c0736c 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -145,9 +145,9 @@ static int br_set_tx_csum(struct net_device *dev, u32 data)
         struct net_bridge *br = netdev_priv(dev);
 
         if (data)
-                br->feature_mask |= NETIF_F_IP_CSUM;
+                br->feature_mask |= NETIF_F_NO_CSUM;
         else
-                br->feature_mask &= ~NETIF_F_IP_CSUM;
+                br->feature_mask &= ~NETIF_F_ALL_CSUM;
 
         br_features_recompute(br);
         return 0;
@@ -185,5 +185,5 @@ void br_dev_setup(struct net_device *dev)
         dev->priv_flags = IFF_EBRIDGE;
 
         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
-                | NETIF_F_HIGHDMA | NETIF_F_TSO | NETIF_F_IP_CSUM;
+                | NETIF_F_HIGHDMA | NETIF_F_TSO | NETIF_F_NO_CSUM;
 }
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 90c95f59dc82..fdec773f5b52 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -372,11 +372,17 @@ void br_features_recompute(struct net_bridge *br)
         struct net_bridge_port *p;
         unsigned long features, checksum;
 
-        features = br->feature_mask &~ NETIF_F_IP_CSUM;
-        checksum = br->feature_mask & NETIF_F_IP_CSUM;
+        checksum = br->feature_mask & NETIF_F_ALL_CSUM ? NETIF_F_NO_CSUM : 0;
+        features = br->feature_mask & ~NETIF_F_ALL_CSUM;
 
         list_for_each_entry(p, &br->port_list, list) {
-                if (!(p->dev->features & NETIF_F_ALL_CSUM))
+                if (checksum & NETIF_F_NO_CSUM &&
+                    !(p->dev->features & NETIF_F_NO_CSUM))
+                        checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
+                if (checksum & NETIF_F_HW_CSUM &&
+                    !(p->dev->features & NETIF_F_HW_CSUM))
+                        checksum ^= NETIF_F_HW_CSUM | NETIF_F_IP_CSUM;
+                if (!(p->dev->features & NETIF_F_IP_CSUM))
                         checksum = 0;
                 features &= p->dev->features;
         }