Thread (1 message) 1 message, 1 author, 2008-01-09
DORMANTno replies REVIEWED: 2 (0M)

2 review trailers.

[PATCH net-2.6.25 7/19] [IPV4] Unify access to the routing tables.

From: Denis V. Lunev <hidden>
Date: 2008-01-09 18:04:28
Subsystem: networking [general], networking [ipv4/ipv6], the rest · Maintainers: "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds

Possibly related (same subject, not in this thread)

Replace the direct pointers to local and main tables with
calls to fib_get_table() with appropriate argument.

This doesn't introduce additional dereferences, but makes the access to fib
tables uniform in any (CONFIG_IP_MULTIPLE_TABLES) case.

Acked-by: Benjamin Thery <benjamin.thery-6ktuUTfB/bM@public.gmane.org>
Acked-by: Daniel Lezcano <dlezcano-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Denis V. Lunev <redacted>
---
 include/net/ip_fib.h    |   39 ++++++++++++++++++++++++++++-----------
 net/ipv4/fib_frontend.c |   29 ++++++++++++-----------------
 2 files changed, 40 insertions(+), 28 deletions(-)
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 338d3ed..06e6a33 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -120,16 +120,22 @@ struct fib_result_nl {
 	int             err;      
 };
 
+extern struct hlist_head fib_table_hash[];
+
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 
 #define FIB_RES_NH(res)		((res).fi->fib_nh[(res).nh_sel])
 #define FIB_RES_RESET(res)	((res).nh_sel = 0)
 
+#define FIB_TABLE_HASHSZ 2
+
 #else /* CONFIG_IP_ROUTE_MULTIPATH */
 
 #define FIB_RES_NH(res)		((res).fi->fib_nh[0])
 #define FIB_RES_RESET(res)
 
+#define FIB_TABLE_HASHSZ 256
+
 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
 
 #define FIB_RES_PREFSRC(res)		((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
@@ -156,14 +162,17 @@ struct fib_table {
 
 #ifndef CONFIG_IP_MULTIPLE_TABLES
 
-extern struct fib_table *ip_fib_local_table;
-extern struct fib_table *ip_fib_main_table;
+#define TABLE_LOCAL_INDEX	0
+#define TABLE_MAIN_INDEX	1
 
 static inline struct fib_table *fib_get_table(u32 id)
 {
-	if (id != RT_TABLE_LOCAL)
-		return ip_fib_main_table;
-	return ip_fib_local_table;
+	struct hlist_head *ptr;
+
+	ptr = id == RT_TABLE_LOCAL ?
+		&fib_table_hash[TABLE_LOCAL_INDEX] :
+		&fib_table_hash[TABLE_MAIN_INDEX];
+	return hlist_entry(ptr->first, struct fib_table, tb_hlist);
 }
 
 static inline struct fib_table *fib_new_table(u32 id)
@@ -173,16 +182,24 @@ static inline struct fib_table *fib_new_table(u32 id)
 
 static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
 {
-	if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
-	    ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
-		return -ENETUNREACH;
-	return 0;
+	struct fib_table *table;
+
+	table = fib_get_table(RT_TABLE_LOCAL);
+	if (!table->tb_lookup(table, flp, res))
+		return 0;
+
+	table = fib_get_table(RT_TABLE_MAIN);
+	if (!table->tb_lookup(table, flp, res))
+		return 0;
+	return -ENETUNREACH;
 }
 
-static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
+static inline void fib_select_default(const struct flowi *flp,
+				      struct fib_result *res)
 {
+	struct fib_table *table = fib_get_table(RT_TABLE_MAIN);
 	if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
-		ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
+		table->tb_select_default(table, flp, res);
 }
 
 #else /* CONFIG_IP_MULTIPLE_TABLES */
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 714fff9..df9716f 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -50,39 +50,34 @@
 #define FFprint(a...) printk(KERN_DEBUG a)
 
 static struct sock *fibnl;
+struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
 
 #ifndef CONFIG_IP_MULTIPLE_TABLES
 
-struct fib_table *ip_fib_local_table;
-struct fib_table *ip_fib_main_table;
-
-#define FIB_TABLE_HASHSZ 1
-static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
-
 static int __net_init fib4_rules_init(struct net *net)
 {
-	ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL);
-	if (ip_fib_local_table == NULL)
+	struct fib_table *local_table, *main_table;
+
+	local_table = fib_hash_init(RT_TABLE_LOCAL);
+	if (local_table == NULL)
 		return -ENOMEM;
 
-	ip_fib_main_table  = fib_hash_init(RT_TABLE_MAIN);
-	if (ip_fib_main_table == NULL)
+	main_table  = fib_hash_init(RT_TABLE_MAIN);
+	if (main_table == NULL)
 		goto fail;
 
-	hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]);
-	hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]);
+	hlist_add_head_rcu(&local_table->tb_hlist,
+				&fib_table_hash[TABLE_LOCAL_INDEX]);
+	hlist_add_head_rcu(&main_table->tb_hlist,
+				&fib_table_hash[TABLE_MAIN_INDEX]);
 	return 0;
 
 fail:
-	kfree(ip_fib_local_table);
-	ip_fib_local_table = NULL;
+	kfree(local_table);
 	return -ENOMEM;
 }
 #else
 
-#define FIB_TABLE_HASHSZ 256
-static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
-
 struct fib_table *fib_new_table(u32 id)
 {
 	struct fib_table *tb;
-- 
1.5.3.rc5
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