Subject: [RFC][PATCH] Turn part of SNMP accounting macros into functions

From: Pavel Emelyanov <[email-masked]>
Date: Wed, 27 Aug 2008 20:31:25 +0400

After turning IP_XXX_STATS, TCP_XXX_STATS and NET_XXX_STATS from
macros into functions the net/ipv4/built-in.o shrank significantly:

add/remove: 14/0 grow/shrink: 0/67 up/down: 482/-2246 (-1764)

Turning the CONFIG_NET_NS option on makes this shrink even larger:

add/remove: 14/0 grow/shrink: 0/67 up/down: 478/-2646 (-2168)

So the question is - what was the reason to keep those as macros?
I thought about the possible performance questions, but netperf
didn't show any (I admit I just cannot cook it properly).

The sample patch is here, but it's not good (EXPORTs for ipv6
and a better place for functions rather than net/ipv4/af_inet.c
are required).

Signed-off-by: Pavel Emelyanov <[email-masked]>

diff --git a/include/net/ip.h b/include/net/ip.h
index 250e6ef..ad8ef7b 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -156,14 +156,16 @@ struct ipv4_config
 };
 
 extern struct ipv4_config ipv4_config;
-#define IP_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.ip_statistics, field)
-#define IP_INC_STATS_BH(net, field)	SNMP_INC_STATS_BH((net)->mib.ip_statistics, field)
-#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val)
-#define NET_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.net_statistics, field)
-#define NET_INC_STATS_BH(net, field)	SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
-#define NET_INC_STATS_USER(net, field) 	SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
-#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
-#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
+
+void IP_INC_STATS(struct net *net, int field);
+void IP_INC_STATS_BH(struct net *net, int field);
+void IP_ADD_STATS_BH(struct net *net, int field, int val);
+
+void NET_INC_STATS(struct net *net, int field);
+void NET_INC_STATS_BH(struct net *net, int field);
+void NET_INC_STATS_USER(struct net *net, int field);
+void NET_ADD_STATS_BH(struct net *net, int field, int val);
+void NET_ADD_STATS_USER(struct net *net, int field, int val);
 
 extern unsigned long snmp_fold_field(void *mib[], int offt);
 extern int snmp_mib_init(void *ptr[2], size_t mibsize);
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 8983386..b973e68 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -267,10 +267,10 @@ static inline int tcp_too_many_orphans(struct sock *sk, int num)
 
 extern struct proto tcp_prot;
 
-#define TCP_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.tcp_statistics, field)
-#define TCP_INC_STATS_BH(net, field)	SNMP_INC_STATS_BH((net)->mib.tcp_statistics, field)
-#define TCP_DEC_STATS(net, field)	SNMP_DEC_STATS((net)->mib.tcp_statistics, field)
-#define TCP_ADD_STATS_USER(net, field, val) SNMP_ADD_STATS_USER((net)->mib.tcp_statistics, field, val)
+void TCP_INC_STATS(struct net *net, int field);
+void TCP_INC_STATS_BH(struct net *net, int field);
+void TCP_DEC_STATS(struct net *net, int field);
+void TCP_ADD_STATS_USER(struct net *net, int field, int val);
 
 extern void			tcp_v4_err(struct sk_buff *skb, u32);
 
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 8a3ac1f..413adda 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1580,3 +1580,63 @@ EXPORT_SYMBOL(inet_stream_connect);
 EXPORT_SYMBOL(inet_stream_ops);
 EXPORT_SYMBOL(inet_unregister_protosw);
 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
+
+void NET_INC_STATS(struct net *net, int field)
+{
+	SNMP_INC_STATS((net)->mib.net_statistics, field);
+}
+
+void NET_INC_STATS_BH(struct net *net, int field)
+{
+	SNMP_INC_STATS_BH((net)->mib.net_statistics, field);
+}
+
+void NET_INC_STATS_USER(struct net *net, int field)
+{
+	SNMP_INC_STATS_USER((net)->mib.net_statistics, field);
+}
+
+void NET_ADD_STATS_BH(struct net *net, int field, int adnd)
+{
+	SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd);
+}
+
+void NET_ADD_STATS_USER(struct net *net, int field, int adnd)
+{
+	SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd);
+}
+
+void IP_INC_STATS(struct net *net, int field)
+{
+	SNMP_INC_STATS((net)->mib.ip_statistics, field);
+}
+
+void IP_INC_STATS_BH(struct net *net, int field)
+{
+	SNMP_INC_STATS_BH((net)->mib.ip_statistics, field);
+}
+
+void IP_ADD_STATS_BH(struct net *net, int field, int val)
+{
+	SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val);
+}
+
+void TCP_INC_STATS(struct net *net, int field)
+{
+	SNMP_INC_STATS((net)->mib.tcp_statistics, field);
+}
+
+void TCP_INC_STATS_BH(struct net *net, int field)
+{
+	SNMP_INC_STATS_BH((net)->mib.tcp_statistics, field);
+}
+
+void TCP_DEC_STATS(struct net *net, int field)
+{
+	SNMP_DEC_STATS((net)->mib.tcp_statistics, field);
+}
+
+void TCP_ADD_STATS_USER(struct net *net, int field, int val)
+{
+	SNMP_ADD_STATS_USER((net)->mib.tcp_statistics, field, val);
+}