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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2016-03-07 18:44:37 +0100 |
|---|---|---|
| committer | Scott Wood <oss@buserror.net> | 2016-03-09 10:44:18 -0600 |
| commit | 7e393220b6e1ecfa5520d1b2ca31150b7588f458 (patch) | |
| tree | dcea05372297033d1327befd4cfa60dfb24141fb /arch/powerpc/lib | |
| parent | ac6082dd32da2774241a75f1fca2de71a39ef768 (diff) | |
| download | linux-7e393220b6e1ecfa5520d1b2ca31150b7588f458.tar.gz | |
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')
| -rw-r--r-- | arch/powerpc/lib/checksum_32.S | 4 | ||||
| -rw-r--r-- | arch/powerpc/lib/checksum_64.S | 4 | ||||
| -rw-r--r-- | arch/powerpc/lib/ppc_ksyms.c | 2 |
3 files changed, 5 insertions, 5 deletions
diff --git a/arch/powerpc/lib/checksum_32.S b/arch/powerpc/lib/checksum_32.S index 0d34f47c8a5e..d90870a66b60 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 */ diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S index f53f4abb9282..8e6e51016cc5 100644 --- a/arch/powerpc/lib/checksum_64.S +++ b/arch/powerpc/lib/checksum_64.S @@ -21,9 +21,9 @@ * Computes the checksum of a memory block at buff, length len, * and adds in "sum" (32-bit). * - * csum_partial(r3=buff, r4=len, r5=sum) + * __csum_partial(r3=buff, r4=len, r5=sum) */ -_GLOBAL(csum_partial) +_GLOBAL(__csum_partial) addic r0,r5,0 /* clear carry */ srdi. r6,r4,3 /* less than 8 bytes? */ diff --git a/arch/powerpc/lib/ppc_ksyms.c b/arch/powerpc/lib/ppc_ksyms.c index 8cd5c0b2986c..c422812f7405 100644 --- a/arch/powerpc/lib/ppc_ksyms.c +++ b/arch/powerpc/lib/ppc_ksyms.c @@ -17,7 +17,7 @@ EXPORT_SYMBOL(strcmp); EXPORT_SYMBOL(strncmp); #ifndef CONFIG_GENERIC_CSUM -EXPORT_SYMBOL(csum_partial); +EXPORT_SYMBOL(__csum_partial); EXPORT_SYMBOL(csum_partial_copy_generic); #endif |