bridge: Simplify interface for ATM LANE

This patch changes FDB entry check for ATM LANE bridge integration.
There's no point in holding a FDB entry around SKB building.

br_fdb_get()/br_fdb_put() pair are changed into single br_fdb_test_addr()
hook that checks if the addr has FDB entry pointing to other port
to the one the request arrived on.

FDB entry refcounting is removed as it's not used anywhere else.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/atm/lec.c b/net/atm/lec.c
index 199b6bb79f429aadeaf6a26ad6c3b65d200d1644..75b9d59553fc8723b2249fcf183f9ef2298bdb73 100644 (file)
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -34,7 +34,6 @@
 
 /* Proxy LEC knows about bridging */
 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-#include <linux/if_bridge.h>
 #include "../bridge/br_private.h"
 
 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
@@ -518,18 +517,14 @@ static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
        case l_should_bridge:
 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
                {
-                       struct net_bridge_fdb_entry *f;
-
                        pr_debug("%s: bridge zeppelin asks about %pM\n",
                                 dev->name, mesg->content.proxy.mac_addr);
 
-                       if (br_fdb_get_hook == NULL || dev->br_port == NULL)
+                       if (br_fdb_test_addr_hook == NULL)
                                break;
 
-                       f = br_fdb_get_hook(dev->br_port->br,
-                                           mesg->content.proxy.mac_addr);
-                       if (f != NULL && f->dst->dev != dev
-                           && f->dst->state == BR_STATE_FORWARDING) {
+                       if (br_fdb_test_addr_hook(dev,
+                                       mesg->content.proxy.mac_addr)) {
                                /* hit from bridge table, send LE_ARP_RESPONSE */
                                struct sk_buff *skb2;
                                struct sock *sk;
@@ -540,10 +535,8 @@ static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
                                skb2 =
                                    alloc_skb(sizeof(struct atmlec_msg),
                                              GFP_ATOMIC);
-                               if (skb2 == NULL) {
-                                       br_fdb_put_hook(f);
+                               if (skb2 == NULL)
                                        break;
-                               }
                                skb2->len = sizeof(struct atmlec_msg);
                                skb_copy_to_linear_data(skb2, mesg,
                                                        sizeof(*mesg));
@@ -552,8 +545,6 @@ static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
                                skb_queue_tail(&sk->sk_receive_queue, skb2);
                                sk->sk_data_ready(sk, skb2->len);
                        }
-                       if (f != NULL)
-                               br_fdb_put_hook(f);
                }
 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
                break;

diff --git a/net/bridge/br.c b/net/bridge/br.c
index 4d2c1f1cb5243d2d4e7e7713bc411d4d13491e4d..9aac5213105aaf031e5ca1fcc993a051800e1475 100644 (file)
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -65,8 +65,9 @@ static int __init br_init(void)
        brioctl_set(br_ioctl_deviceless_stub);
        br_handle_frame_hook = br_handle_frame;
 
-       br_fdb_get_hook = br_fdb_get;
-       br_fdb_put_hook = br_fdb_put;
+#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+       br_fdb_test_addr_hook = br_fdb_test_addr;
+#endif
 
        return 0;
 err_out4:
@@ -95,8 +96,9 @@ static void __exit br_deinit(void)
        synchronize_net();
 
        br_netfilter_fini();
-       br_fdb_get_hook = NULL;
-       br_fdb_put_hook = NULL;
+#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+       br_fdb_test_addr_hook = NULL;
+#endif
 
        br_handle_frame_hook = NULL;
        br_fdb_fini();

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index cb3e97b93aebdaddb164b9702deeae88144183a4..57bf05c353bc804c58cffb5dc060c53850aacf79 100644 (file)
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -71,10 +71,17 @@ static inline int br_mac_hash(const unsigned char *mac)
        return jhash_1word(key, fdb_salt) & (BR_HASH_SIZE - 1);
 }
 
+static void fdb_rcu_free(struct rcu_head *head)
+{
+       struct net_bridge_fdb_entry *ent
+               = container_of(head, struct net_bridge_fdb_entry, rcu);
+       kmem_cache_free(br_fdb_cache, ent);
+}
+
 static inline void fdb_delete(struct net_bridge_fdb_entry *f)
 {
        hlist_del_rcu(&f->hlist);
-       br_fdb_put(f);
+       call_rcu(&f->rcu, fdb_rcu_free);
 }
 
 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
@@ -226,33 +233,26 @@ struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
        return NULL;
 }
 
-/* Interface used by ATM hook that keeps a ref count */
-struct net_bridge_fdb_entry *br_fdb_get(struct net_bridge *br,
-                                       unsigned char *addr)
+#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+/* Interface used by ATM LANE hook to test
+ * if an addr is on some other bridge port */
+int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
 {
        struct net_bridge_fdb_entry *fdb;
+       int ret;
+
+       if (!dev->br_port)
+               return 0;
 
        rcu_read_lock();
-       fdb = __br_fdb_get(br, addr);
-       if (fdb && !atomic_inc_not_zero(&fdb->use_count))
-               fdb = NULL;
+       fdb = __br_fdb_get(dev->br_port->br, addr);
+       ret = fdb && fdb->dst->dev != dev &&
+               fdb->dst->state == BR_STATE_FORWARDING;
        rcu_read_unlock();
-       return fdb;
-}
-
-static void fdb_rcu_free(struct rcu_head *head)
-{
-       struct net_bridge_fdb_entry *ent
-               = container_of(head, struct net_bridge_fdb_entry, rcu);
-       kmem_cache_free(br_fdb_cache, ent);
-}
 
-/* Set entry up for deletion with RCU  */
-void br_fdb_put(struct net_bridge_fdb_entry *ent)
-{
-       if (atomic_dec_and_test(&ent->use_count))
-               call_rcu(&ent->rcu, fdb_rcu_free);
+       return ret;
 }
+#endif /* CONFIG_ATM_LANE */
 
 /*
  * Fill buffer with forwarding table records in
@@ -326,7 +326,6 @@ static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
        fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
        if (fdb) {
                memcpy(fdb->addr.addr, addr, ETH_ALEN);
-               atomic_set(&fdb->use_count, 1);
                hlist_add_head_rcu(&fdb->hlist, head);
 
                fdb->dst = source;

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index b6c3b71974dc3d02da81b94b9f8f113732d6c157..d5b5537272b47af9c1e8abdcc7a693ac6a7e63cd 100644 (file)
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -51,7 +51,6 @@ struct net_bridge_fdb_entry
        struct net_bridge_port          *dst;
 
        struct rcu_head                 rcu;
-       atomic_t                        use_count;
        unsigned long                   ageing_timer;
        mac_addr                        addr;
        unsigned char                   is_local;
@@ -154,9 +153,7 @@ extern void br_fdb_delete_by_port(struct net_bridge *br,
                                  const struct net_bridge_port *p, int do_all);
 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
                                                 const unsigned char *addr);
-extern struct net_bridge_fdb_entry *br_fdb_get(struct net_bridge *br,
-                                              unsigned char *addr);
-extern void br_fdb_put(struct net_bridge_fdb_entry *ent);
+extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
                          unsigned long count, unsigned long off);
 extern int br_fdb_insert(struct net_bridge *br,
@@ -242,10 +239,9 @@ extern void br_stp_port_timer_init(struct net_bridge_port *p);
 extern unsigned long br_timer_value(const struct timer_list *timer);
 
 /* br.c */
-extern struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
-                                                      unsigned char *addr);
-extern void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
-
+#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
+#endif
 
 /* br_netlink.c */
 extern int br_netlink_init(void);

diff --git a/net/core/dev.c b/net/core/dev.c
index a09bf658970f6b48d8c59a231df6367ce356abbc..ea00e36f48e175c51c30c0b94f253f16f5be0989 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2071,11 +2071,13 @@ static inline int deliver_skb(struct sk_buff *skb,
 }
 
 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
-/* These hooks defined here for ATM */
-struct net_bridge;
-struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
-                                               unsigned char *addr);
-void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
+
+#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+/* This hook is defined here for ATM LANE */
+int (*br_fdb_test_addr_hook)(struct net_device *dev,
+                            unsigned char *addr) __read_mostly;
+EXPORT_SYMBOL(br_fdb_test_addr_hook);
+#endif
 
 /*
  * If bridge module is loaded call bridging hook.
@@ -2083,6 +2085,8 @@ void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
  */
 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
                                        struct sk_buff *skb) __read_mostly;
+EXPORT_SYMBOL(br_handle_frame_hook);
+
 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
                                            struct packet_type **pt_prev, int *ret,
                                            struct net_device *orig_dev)
@@ -5665,12 +5669,6 @@ EXPORT_SYMBOL(net_enable_timestamp);
 EXPORT_SYMBOL(net_disable_timestamp);
 EXPORT_SYMBOL(dev_get_flags);
 
-#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-EXPORT_SYMBOL(br_handle_frame_hook);
-EXPORT_SYMBOL(br_fdb_get_hook);
-EXPORT_SYMBOL(br_fdb_put_hook);
-#endif
-
 EXPORT_SYMBOL(dev_load);
 
 EXPORT_PER_CPU_SYMBOL(softnet_data);