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netfilter: nf_conntrack: use atomic64 for accounting counters 

We can use atomic64_t infrastructure to avoid taking a spinlock in fast
path, and remove inaccuracies while reading values in
ctnetlink_dump_counters() and connbytes_mt() on 32bit arches.

Suggested by Pablo.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Eric Dumazet 2011-12-14 14:45:20 +01:00 committed by Pablo Neira Ayuso
parent 76ad94fc5d
commit b3e0bfa71b
5 changed files with 33 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/netfilter/nf_conntrack_acct.h
View File

@ -15,8 +15,8 @@
#include <net/netfilter/nf_conntrack_extend.h>
struct nf_conn_counter {
u_int64_t packets;
u_int64_t bytes;
atomic64_t packets;
atomic64_t bytes;
};
static inline

4
net/netfilter/nf_conntrack_acct.c
View File

@ -46,8 +46,8 @@ seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
return 0;
return seq_printf(s, "packets=%llu bytes=%llu ",
(unsigned long long)acct[dir].packets,
(unsigned long long)acct[dir].bytes);
(unsigned long long)atomic64_read(&acct[dir].packets),
(unsigned long long)atomic64_read(&acct[dir].bytes));
};
EXPORT_SYMBOL_GPL(seq_print_acct);

14
net/netfilter/nf_conntrack_core.c
View File

@ -1044,10 +1044,8 @@ acct:
acct = nf_conn_acct_find(ct);
if (acct) {
spin_lock_bh(&ct->lock);
acct[CTINFO2DIR(ctinfo)].packets++;
acct[CTINFO2DIR(ctinfo)].bytes += skb->len;
spin_unlock_bh(&ct->lock);
atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets);
atomic64_add(skb->len, &acct[CTINFO2DIR(ctinfo)].bytes);
}
}
}
@ -1063,11 +1061,9 @@ bool __nf_ct_kill_acct(struct nf_conn *ct,
acct = nf_conn_acct_find(ct);
if (acct) {
spin_lock_bh(&ct->lock);
acct[CTINFO2DIR(ctinfo)].packets++;
acct[CTINFO2DIR(ctinfo)].bytes +=
skb->len - skb_network_offset(skb);
spin_unlock_bh(&ct->lock);
atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets);
atomic64_add(skb->len - skb_network_offset(skb),
&acct[CTINFO2DIR(ctinfo)].bytes);
}
}

12
net/netfilter/nf_conntrack_netlink.c
View File

@ -219,9 +219,9 @@ ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
goto nla_put_failure;
NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
cpu_to_be64(acct[dir].packets));
cpu_to_be64(atomic64_read(&acct[dir].packets)));
NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
cpu_to_be64(acct[dir].bytes));
cpu_to_be64(atomic64_read(&acct[dir].bytes)));
nla_nest_end(skb, nest_count);
@ -720,8 +720,12 @@ restart:
struct nf_conn_counter *acct;
acct = nf_conn_acct_find(ct);
if (acct)
memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
if (acct) {
atomic64_set(&acct[IP_CT_DIR_ORIGINAL].bytes, 0);
atomic64_set(&acct[IP_CT_DIR_ORIGINAL].packets, 0);
atomic64_set(&acct[IP_CT_DIR_REPLY].bytes, 0);
atomic64_set(&acct[IP_CT_DIR_REPLY].packets, 0);
}
}
}
if (cb->args[1]) {

32
net/netfilter/xt_connbytes.c
View File

@ -40,46 +40,46 @@ connbytes_mt(const struct sk_buff *skb, struct xt_action_param *par)
case XT_CONNBYTES_PKTS:
switch (sinfo->direction) {
case XT_CONNBYTES_DIR_ORIGINAL:
what = counters[IP_CT_DIR_ORIGINAL].packets;
what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets);
break;
case XT_CONNBYTES_DIR_REPLY:
what = counters[IP_CT_DIR_REPLY].packets;
what = atomic64_read(&counters[IP_CT_DIR_REPLY].packets);
break;
case XT_CONNBYTES_DIR_BOTH:
what = counters[IP_CT_DIR_ORIGINAL].packets;
what += counters[IP_CT_DIR_REPLY].packets;
what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets);
what += atomic64_read(&counters[IP_CT_DIR_REPLY].packets);
break;
}
break;
case XT_CONNBYTES_BYTES:
switch (sinfo->direction) {
case XT_CONNBYTES_DIR_ORIGINAL:
what = counters[IP_CT_DIR_ORIGINAL].bytes;
what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes);
break;
case XT_CONNBYTES_DIR_REPLY:
what = counters[IP_CT_DIR_REPLY].bytes;
what = atomic64_read(&counters[IP_CT_DIR_REPLY].bytes);
break;
case XT_CONNBYTES_DIR_BOTH:
what = counters[IP_CT_DIR_ORIGINAL].bytes;
what += counters[IP_CT_DIR_REPLY].bytes;
what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes);
what += atomic64_read(&counters[IP_CT_DIR_REPLY].bytes);
break;
}
break;
case XT_CONNBYTES_AVGPKT:
switch (sinfo->direction) {
case XT_CONNBYTES_DIR_ORIGINAL:
bytes = counters[IP_CT_DIR_ORIGINAL].bytes;
pkts = counters[IP_CT_DIR_ORIGINAL].packets;
bytes = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes);
pkts = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets);
break;
case XT_CONNBYTES_DIR_REPLY:
bytes = counters[IP_CT_DIR_REPLY].bytes;
pkts = counters[IP_CT_DIR_REPLY].packets;
bytes = atomic64_read(&counters[IP_CT_DIR_REPLY].bytes);
pkts = atomic64_read(&counters[IP_CT_DIR_REPLY].packets);
break;
case XT_CONNBYTES_DIR_BOTH:
bytes = counters[IP_CT_DIR_ORIGINAL].bytes +
counters[IP_CT_DIR_REPLY].bytes;
pkts = counters[IP_CT_DIR_ORIGINAL].packets +
counters[IP_CT_DIR_REPLY].packets;
bytes = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes) +
atomic64_read(&counters[IP_CT_DIR_REPLY].bytes);
pkts = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets) +
atomic64_read(&counters[IP_CT_DIR_REPLY].packets);
break;
}
if (pkts != 0)