[NET] NETNS: Omit neigh_parms->net and pneigh_entry->net without CONFIG_NET_NS.

Introduce neigh_parms/pneigh_entry inlines: neigh_parms_net(), pneigh_net().
Without CONFIG_NET_NS, no namespace other than &init_net exists.
Let's explicitly define them to help compiler optimizations.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

2 files changed, 41 insertions, 10 deletions

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 062281872064..8bec0d69b270 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -38,7 +38,9 @@ struct neighbour;
 
 struct neigh_parms
 {
+#ifdef CONFIG_NET_NS
         struct net *net;
+#endif
         struct net_device *dev;
         struct neigh_parms *next;
         int     (*neigh_setup)(struct neighbour *);
@@ -131,7 +133,9 @@ struct neigh_ops
 struct pneigh_entry
 {
         struct pneigh_entry     *next;
+#ifdef CONFIG_NET_NS
         struct net              *net;
+#endif
         struct net_device       *dev;
         u8                      flags;
         u8                      key[0];
@@ -213,6 +217,17 @@ extern struct neighbour 	*neigh_event_ns(struct neigh_table *tbl,
 
 extern struct neigh_parms       *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
 extern void                     neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
+
+static inline
+struct net                      *neigh_parms_net(const struct neigh_parms *parms)
+{
+#ifdef CONFIG_NET_NS
+        return parms->net;
+#else
+        return &init_net;
+#endif
+}
+
 extern unsigned long            neigh_rand_reach_time(unsigned long base);
 
 extern void                     pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
@@ -220,6 +235,16 @@ extern void			pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
 extern struct pneigh_entry      *pneigh_lookup(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev, int creat);
 extern int                      pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev);
 
+static inline
+struct net                      *pneigh_net(const struct pneigh_entry *pneigh)
+{
+#ifdef CONFIG_NET_NS
+        return pneigh->net;
+#else
+        return &init_net;
+#endif
+}
+
 extern void neigh_app_ns(struct neighbour *n);
 extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
 extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index b8d491fb4b42..de654ea8a944 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -483,7 +483,7 @@ struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl,
 
         for (n = tbl->phash_buckets[hash_val]; n; n = n->next) {
                 if (!memcmp(n->key, pkey, key_len) &&
-                    (n->net == net) &&
+                    (pneigh_net(n) == net) &&
                     (n->dev == dev || !n->dev)) {
                         read_unlock_bh(&tbl->lock);
                         goto out;
@@ -500,7 +500,9 @@ struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl,
         if (!n)
                 goto out;
 
+#ifdef CONFIG_NET_NS
         n->net = hold_net(net);
+#endif
         memcpy(n->key, pkey, key_len);
         n->dev = dev;
         if (dev)
@@ -540,14 +542,14 @@ int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey,
         for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL;
              np = &n->next) {
                 if (!memcmp(n->key, pkey, key_len) && n->dev == dev &&
-                    (n->net == net)) {
+                    (pneigh_net(n) == net)) {
                         *np = n->next;
                         write_unlock_bh(&tbl->lock);
                         if (tbl->pdestructor)
                                 tbl->pdestructor(n);
                         if (n->dev)
                                 dev_put(n->dev);
-                        release_net(n->net);
+                        release_net(pneigh_net(n));
                         kfree(n);
                         return 0;
                 }
@@ -570,7 +572,7 @@ static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev)
                                         tbl->pdestructor(n);
                                 if (n->dev)
                                         dev_put(n->dev);
-                                release_net(n->net);
+                                release_net(pneigh_net(n));
                                 kfree(n);
                                 continue;
                         }
@@ -1284,7 +1286,7 @@ static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl,
         struct neigh_parms *p;
 
         for (p = &tbl->parms; p; p = p->next) {
-                if ((p->dev && p->dev->ifindex == ifindex && p->net == net) ||
+                if ((p->dev && p->dev->ifindex == ifindex && neigh_parms_net(p) == net) ||
                     (!p->dev && !ifindex))
                         return p;
         }
@@ -1318,7 +1320,9 @@ struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
 
                 dev_hold(dev);
                 p->dev = dev;
+#ifdef CONFIG_NET_NS
                 p->net = hold_net(net);
+#endif
                 p->sysctl_table = NULL;
                 write_lock_bh(&tbl->lock);
                 p->next         = tbl->parms.next;
@@ -1360,7 +1364,7 @@ void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms)
 
 static void neigh_parms_destroy(struct neigh_parms *parms)
 {
-        release_net(parms->net);
+        release_net(neigh_parms_net(parms));
         kfree(parms);
 }
 
@@ -1371,7 +1375,9 @@ void neigh_table_init_no_netlink(struct neigh_table *tbl)
         unsigned long now = jiffies;
         unsigned long phsize;
 
+#ifdef CONFIG_NET_NS
         tbl->parms.net = &init_net;
+#endif
         atomic_set(&tbl->parms.refcnt, 1);
         INIT_RCU_HEAD(&tbl->parms.rcu_head);
         tbl->parms.reachable_time =
@@ -1958,7 +1964,7 @@ static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
                         break;
 
                 for (nidx = 0, p = tbl->parms.next; p; p = p->next) {
-                        if (net != p->net)
+                        if (net != neigh_parms_net(p))
                                 continue;
 
                         if (nidx++ < neigh_skip)
@@ -2254,7 +2260,7 @@ static struct pneigh_entry *pneigh_get_first(struct seq_file *seq)
         state->flags |= NEIGH_SEQ_IS_PNEIGH;
         for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) {
                 pn = tbl->phash_buckets[bucket];
-                while (pn && (pn->net != net))
+                while (pn && (pneigh_net(pn) != net))
                         pn = pn->next;
                 if (pn)
                         break;
@@ -2277,7 +2283,7 @@ static struct pneigh_entry *pneigh_get_next(struct seq_file *seq,
                 if (++state->bucket > PNEIGH_HASHMASK)
                         break;
                 pn = tbl->phash_buckets[state->bucket];
-                while (pn && (pn->net != net))
+                while (pn && (pneigh_net(pn) != net))
                         pn = pn->next;
                 if (pn)
                         break;
@@ -2740,7 +2746,7 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
         neigh_path[NEIGH_CTL_PATH_PROTO].ctl_name = p_id;
 
         t->sysctl_header =
-                register_net_sysctl_table(p->net, neigh_path, t->neigh_vars);
+                register_net_sysctl_table(neigh_parms_net(p), neigh_path, t->neigh_vars);
         if (!t->sysctl_header)
                 goto free_procname;