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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2016-03-07 17:44:37 (GMT) |
|---|---|---|
| committer | Scott Wood <oss@buserror.net> | 2016-03-09 16:44:18 (GMT) |
| commit | 7e393220b6e1ecfa5520d1b2ca31150b7588f458 (patch) | |
| tree | dcea05372297033d1327befd4cfa60dfb24141fb /arch/powerpc/lib/checksum_32.S | |
| parent | ac6082dd32da2774241a75f1fca2de71a39ef768 (diff) | |
| download | linux-7e393220b6e1ecfa5520d1b2ca31150b7588f458.tar.xz | |
powerpc: optimise csum_partial() call when len is constant
csum_partial is often called for small fixed length packets
for which it is suboptimal to use the generic csum_partial()
function.
For instance, in my configuration, I got:
* One place calling it with constant len 4
* Seven places calling it with constant len 8
* Three places calling it with constant len 14
* One place calling it with constant len 20
* One place calling it with constant len 24
* One place calling it with constant len 32
This patch renames csum_partial() to __csum_partial() and
implements csum_partial() as a wrapper inline function which
* uses csum_add() for small 16bits multiple constant length
* uses ip_fast_csum() for other 32bits multiple constant
* uses __csum_partial() in all other cases
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>
Diffstat (limited to 'arch/powerpc/lib/checksum_32.S')
| -rw-r--r-- | arch/powerpc/lib/checksum_32.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/lib/checksum_32.S b/arch/powerpc/lib/checksum_32.S index 0d34f47..d90870a 100644 --- a/arch/powerpc/lib/checksum_32.S +++ b/arch/powerpc/lib/checksum_32.S @@ -24,9 +24,9 @@ * computes the checksum of a memory block at buff, length len, * and adds in "sum" (32-bit) * - * csum_partial(buff, len, sum) + * __csum_partial(buff, len, sum) */ -_GLOBAL(csum_partial) +_GLOBAL(__csum_partial) subi r3,r3,4 srawi. r6,r4,2 /* Divide len by 4 and also clear carry */ beq 3f /* if we're doing < 4 bytes */ |