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net: avoid reloads in SNMP_UPD_PO_STATS 

Avoid two instructions to reload dev->nd_net->mib.ip_statistics pointer,
unsing a temp variable, in ip_rcv(), ip_output() paths for example.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-08-04 20:26:13 +00:00 committed by David S. Miller
parent 9eb43e7653
commit d25398df59
1 changed files with 6 additions and 4 deletions
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10
include/net/snmp.h
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@ -154,13 +154,15 @@ struct linux_xfrm_mib {
*/
#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
do { \
this_cpu_inc(mib[0]->mibs[basefield##PKTS]); \
this_cpu_add(mib[0]->mibs[basefield##OCTETS], addend); \
__typeof__(*mib[0]->mibs) *ptr = mib[0]->mibs; \
this_cpu_inc(ptr[basefield##PKTS]); \
this_cpu_add(ptr[basefield##OCTETS], addend); \
} while (0)
#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
do { \
__this_cpu_inc(mib[0]->mibs[basefield##PKTS]); \
__this_cpu_add(mib[0]->mibs[basefield##OCTETS], addend); \
__typeof__(*mib[0]->mibs) *ptr = mib[0]->mibs; \
__this_cpu_inc(ptr[basefield##PKTS]); \
__this_cpu_add(ptr[basefield##OCTETS], addend); \
} while (0)