net: adjust handle_macvlan to pass port struct to hook

Now there's null check here and also again in the hook. Looking at bridge bits
which are simmilar, port structure is rcu_dereferenced right away in
handle_bridge and passed to hook. Looks nicer.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 9a939d8..1b78c00 100644 (file)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -145,19 +145,15 @@ static void macvlan_broadcast(struct sk_buff *skb,
 }
 
 /* called under rcu_read_lock() from netif_receive_skb */
-static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
+static struct sk_buff *macvlan_handle_frame(struct macvlan_port *port,
+                                           struct sk_buff *skb)
 {
        const struct ethhdr *eth = eth_hdr(skb);
-       const struct macvlan_port *port;
        const struct macvlan_dev *vlan;
        const struct macvlan_dev *src;
        struct net_device *dev;
        unsigned int len;
 
-       port = rcu_dereference(skb->dev->macvlan_port);
-       if (port == NULL)
-               return skb;
-
        if (is_multicast_ether_addr(eth->h_dest)) {
                src = macvlan_hash_lookup(port, eth->h_source);
                if (!src)

diff --git a/include/linux/if_macvlan.h b/include/linux/if_macvlan.h
index b78a712..9ea047a 100644 (file)
--- a/include/linux/if_macvlan.h
+++ b/include/linux/if_macvlan.h
@@ -85,6 +85,7 @@ extern netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
                                      struct net_device *dev);
 
 
-extern struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *);
+extern struct sk_buff *(*macvlan_handle_frame_hook)(struct macvlan_port *,
+                                                   struct sk_buff *);
 
 #endif /* _LINUX_IF_MACVLAN_H */

diff --git a/net/core/dev.c b/net/core/dev.c
index 3daee30..5cbba09 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2612,7 +2612,8 @@ static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
 #endif
 
 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
-struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
+struct sk_buff *(*macvlan_handle_frame_hook)(struct macvlan_port *p,
+                                            struct sk_buff *skb) __read_mostly;
 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
 
 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
@@ -2620,14 +2621,17 @@ static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
                                             int *ret,
                                             struct net_device *orig_dev)
 {
-       if (skb->dev->macvlan_port == NULL)
+       struct macvlan_port *port;
+
+       port = rcu_dereference(skb->dev->macvlan_port);
+       if (!port)
                return skb;
 
        if (*pt_prev) {
                *ret = deliver_skb(skb, *pt_prev, orig_dev);
                *pt_prev = NULL;
        }
-       return macvlan_handle_frame_hook(skb);
+       return macvlan_handle_frame_hook(port, skb);
 }
 #else
 #define handle_macvlan(skb, pt_prev, ret, orig_dev)    (skb)