Hi Patrick, Harald,
I was working on unrelated problem and noticed that ip_tables.c
seem to abuse inline. I prepared a patch which removes inlines
except those which are used by packet matching code
(and thus are really performance-critical).
I added comments explaining that remaining inlines are
performance critical.
Result as reported by size:
textdata bss dec hex filename
- 6451 380 8869191b07 ip_tables.o
+ 6339 348 7267591a67 ip_tables.o
Please take this patch into netfilter queue.
Signed-off-by: Denys Vlasenko <[EMAIL PROTECTED]>
--
vda
diff -urpN linux-2.6.org/net/ipv4/netfilter/ip_tables.c linux-2.6.ipt/net/ipv4/netfilter/ip_tables.c
--- linux-2.6.org/net/ipv4/netfilter/ip_tables.c 2007-12-14 10:46:37.0 -0800
+++ linux-2.6.ipt/net/ipv4/netfilter/ip_tables.c 2007-12-16 12:37:46.0 -0800
@@ -74,6 +74,7 @@ do {\
Hence the start of any table is given by get_table() below. */
/* Returns whether matches rule or not. */
+/* Performance critical - called for every packet */
static inline int
ip_packet_match(const struct iphdr *ip,
const char *indev,
@@ -152,7 +153,7 @@ ip_packet_match(const struct iphdr *ip,
return 1;
}
-static inline bool
+static bool
ip_checkentry(const struct ipt_ip *ip)
{
if (ip->flags & ~IPT_F_MASK) {
@@ -182,6 +183,7 @@ ipt_error(struct sk_buff *skb,
return NF_DROP;
}
+/* Performance critical - called for every packet */
static inline
bool do_match(struct ipt_entry_match *m,
const struct sk_buff *skb,
@@ -198,6 +200,7 @@ bool do_match(struct ipt_entry_match *m,
return false;
}
+/* Performance critical */
static inline struct ipt_entry *
get_entry(void *base, unsigned int offset)
{
@@ -205,6 +208,7 @@ get_entry(void *base, unsigned int offse
}
/* All zeroes == unconditional rule. */
+/* Mildly perf critical (only if packet tracing is on) */
static inline int
unconditional(const struct ipt_ip *ip)
{
@@ -219,7 +223,7 @@ unconditional(const struct ipt_ip *ip)
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
-static const char *hooknames[] = {
+static const char *const hooknames[] = {
[NF_IP_PRE_ROUTING] = "PREROUTING",
[NF_IP_LOCAL_IN] = "INPUT",
[NF_IP_FORWARD] = "FORWARD",
@@ -233,7 +237,7 @@ enum nf_ip_trace_comments {
NF_IP_TRACE_COMMENT_POLICY,
};
-static const char *comments[] = {
+static const char *const comments[] = {
[NF_IP_TRACE_COMMENT_RULE] = "rule",
[NF_IP_TRACE_COMMENT_RETURN] = "return",
[NF_IP_TRACE_COMMENT_POLICY] = "policy",
@@ -249,6 +253,7 @@ static struct nf_loginfo trace_loginfo =
},
};
+/* Mildly perf critical (only if packet tracing is on) */
static inline int
get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e,
char *hookname, char **chainname,
@@ -567,7 +572,7 @@ mark_source_chains(struct xt_table_info
return 1;
}
-static inline int
+static int
cleanup_match(struct ipt_entry_match *m, unsigned int *i)
{
if (i && (*i)-- == 0)
@@ -579,7 +584,7 @@ cleanup_match(struct ipt_entry_match *m,
return 0;
}
-static inline int
+static int
check_entry(struct ipt_entry *e, const char *name)
{
struct ipt_entry_target *t;
@@ -599,7 +604,7 @@ check_entry(struct ipt_entry *e, const c
return 0;
}
-static inline int check_match(struct ipt_entry_match *m, const char *name,
+static int check_match(struct ipt_entry_match *m, const char *name,
const struct ipt_ip *ip, unsigned int hookmask,
unsigned int *i)
{
@@ -622,7 +627,7 @@ static inline int check_match(struct ipt
return ret;
}
-static inline int
+static int
find_check_match(struct ipt_entry_match *m,
const char *name,
const struct ipt_ip *ip,
@@ -651,7 +656,7 @@ err:
return ret;
}
-static inline int check_target(struct ipt_entry *e, const char *name)
+static int check_target(struct ipt_entry *e, const char *name)
{
struct ipt_entry_target *t;
struct xt_target *target;
@@ -672,7 +677,7 @@ static inline int check_target(struct ip
return ret;
}
-static inline int
+static int
find_check_entry(struct ipt_entry *e, const char *name, unsigned int size,
unsigned int *i)
{
@@ -716,7 +721,7 @@ find_check_entry(struct ipt_entry *e, co
return ret;
}
-static inline int
+static int
check_entry_size_and_hooks(struct ipt_entry *e,
struct xt_table_info *newinfo,
unsigned char *base,
@@ -759,7 +764,7 @@ check_entry_size_and_hooks(struct ipt_en
return 0;
}
-static inline int
+static int
cleanup_entry(struct ipt_entry *e, unsigned int *i)
{
struct ipt_entry_target *t;
@@ -1293,7 +1298,7 @@ __do_replace(const char *name, unsigned
get_counters(oldinfo, counters);
/* Decrease module usage counts and free resource */
loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
- IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL);
+ IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size,
