ipv4: Don't store a rule pointer in fib_result.

We only use it to fetch the rule's tclassid, so just store the
tclassid there instead.

This also decreases the size of fib_result by a full 8 bytes on
64-bit.  On 32-bits it's a wash.

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 11 insertions, 30 deletions

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index e91fedd22db2..5697acefeba3 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -106,12 +106,10 @@ struct fib_result {
         unsigned char   nh_sel;
         unsigned char   type;
         unsigned char   scope;
+        u32             tclassid;
         struct fib_info *fi;
         struct fib_table *table;
         struct list_head *fa_head;
-#ifdef CONFIG_IP_MULTIPLE_TABLES
-        struct fib_rule *r;
-#endif
 };
 
 struct fib_result_nl {
@@ -215,10 +213,6 @@ static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
 extern int __net_init fib4_rules_init(struct net *net);
 extern void __net_exit fib4_rules_exit(struct net *net);
 
-#ifdef CONFIG_IP_ROUTE_CLASSID
-extern u32 fib_rules_tclass(const struct fib_result *res);
-#endif
-
 extern struct fib_table *fib_new_table(struct net *net, u32 id);
 extern struct fib_table *fib_get_table(struct net *net, u32 id);
 
@@ -229,7 +223,7 @@ static inline int fib_lookup(struct net *net, struct flowi4 *flp,
                              struct fib_result *res)
 {
         if (!net->ipv4.fib_has_custom_rules) {
-                res->r = NULL;
+                res->tclassid = 0;
                 if (net->ipv4.fib_local &&
                     !fib_table_lookup(net->ipv4.fib_local, flp, res,
                                       FIB_LOOKUP_NOREF))
@@ -289,7 +283,7 @@ static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
 #endif
         *itag = FIB_RES_NH(*res).nh_tclassid<<16;
 #ifdef CONFIG_IP_MULTIPLE_TABLES
-        rtag = fib_rules_tclass(res);
+        rtag = res->tclassid;
         if (*itag == 0)
                 *itag = (rtag<<16);
         *itag |= (rtag>>16);
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 81f85716a894..7a31194ec633 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -169,10 +169,6 @@ static inline unsigned int __inet_dev_addr_type(struct net *net,
         if (ipv4_is_multicast(addr))
                 return RTN_MULTICAST;
 
-#ifdef CONFIG_IP_MULTIPLE_TABLES
-        res.r = NULL;
-#endif
-
         local_table = fib_get_table(net, RT_TABLE_LOCAL);
         if (local_table) {
                 ret = RTN_UNICAST;
@@ -934,10 +930,6 @@ static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
                 .flowi4_scope = frn->fl_scope,
         };
 
-#ifdef CONFIG_IP_MULTIPLE_TABLES
-        res.r = NULL;
-#endif
-
         frn->err = -ENOENT;
         if (tb) {
                 local_bh_disable();
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index c06da93b0b70..a83d74e498d2 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -47,13 +47,6 @@ struct fib4_rule {
 #endif
 };
 
-#ifdef CONFIG_IP_ROUTE_CLASSID
-u32 fib_rules_tclass(const struct fib_result *res)
-{
-        return res->r ? ((struct fib4_rule *) res->r)->tclassid : 0;
-}
-#endif
-
 int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
 {
         struct fib_lookup_arg arg = {
@@ -63,8 +56,12 @@ int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
         int err;
 
         err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg);
-        res->r = arg.rule;
-
+#ifdef CONFIG_IP_ROUTE_CLASSID
+        if (arg.rule)
+                res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid;
+        else
+                res->tclassid = 0;
+#endif
         return err;
 }
 EXPORT_SYMBOL_GPL(__fib_lookup);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 9319bf1f8354..aad21819316d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1735,7 +1735,7 @@ static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *fl4,
 
 #ifdef CONFIG_IP_ROUTE_CLASSID
 #ifdef CONFIG_IP_MULTIPLE_TABLES
-        set_class_tag(rt, fib_rules_tclass(res));
+        set_class_tag(rt, res->tclassid);
 #endif
         set_class_tag(rt, itag);
 #endif
@@ -2353,11 +2353,9 @@ static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4)
         __be32 orig_saddr;
         int orig_oif;
 
+        res.tclassid    = 0;
         res.fi          = NULL;
         res.table       = NULL;
-#ifdef CONFIG_IP_MULTIPLE_TABLES
-        res.r           = NULL;
-#endif
 
         orig_daddr = fl4->daddr;
         orig_saddr = fl4->saddr;