From: Noah Goldstein goldstein.w.n@gmail.com
[ Upstream commit 5d4acb62853abac1da2deebcb1c1c5b79219bf3b ]
The special case for odd aligned buffers is unnecessary and mostly just adds overhead. Aligned buffers is the expectations, and even for unaligned buffer, the only case that was helped is if the buffer was 1-byte from word aligned which is ~1/7 of the cases. Overall it seems highly unlikely to be worth to extra branch.
It was left in the previous perf improvement patch because I was erroneously comparing the exact output of `csum_partial(...)`, but really we only need `csum_fold(csum_partial(...))` to match so its safe to remove.
All csum kunit tests pass.
Signed-off-by: Noah Goldstein goldstein.w.n@gmail.com Reviewed-by: Eric Dumazet edumazet@google.com Reviewed-by: David Laight david.laight@aculab.com Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/lib/csum-partial_64.c | 36 ++++------------------------------ 1 file changed, 4 insertions(+), 32 deletions(-)
diff --git a/arch/x86/lib/csum-partial_64.c b/arch/x86/lib/csum-partial_64.c index cea25ca8b8cf6..557e42ede68ec 100644 --- a/arch/x86/lib/csum-partial_64.c +++ b/arch/x86/lib/csum-partial_64.c @@ -11,26 +11,9 @@ #include <asm/checksum.h> #include <asm/word-at-a-time.h>
-static inline unsigned short from32to16(unsigned a) +static inline __wsum csum_finalize_sum(u64 temp64) { - unsigned short b = a >> 16; - asm("addw %w2,%w0\n\t" - "adcw $0,%w0\n" - : "=r" (b) - : "0" (b), "r" (a)); - return b; -} - -static inline __wsum csum_tail(u64 temp64, int odd) -{ - unsigned int result; - - result = add32_with_carry(temp64 >> 32, temp64 & 0xffffffff); - if (unlikely(odd)) { - result = from32to16(result); - result = ((result >> 8) & 0xff) | ((result & 0xff) << 8); - } - return (__force __wsum)result; + return (__force __wsum)((temp64 + ror64(temp64, 32)) >> 32); }
/* @@ -47,17 +30,6 @@ static inline __wsum csum_tail(u64 temp64, int odd) __wsum csum_partial(const void *buff, int len, __wsum sum) { u64 temp64 = (__force u64)sum; - unsigned odd; - - odd = 1 & (unsigned long) buff; - if (unlikely(odd)) { - if (unlikely(len == 0)) - return sum; - temp64 = ror32((__force u32)sum, 8); - temp64 += (*(unsigned char *)buff << 8); - len--; - buff++; - }
/* * len == 40 is the hot case due to IPv6 headers, but annotating it likely() @@ -73,7 +45,7 @@ __wsum csum_partial(const void *buff, int len, __wsum sum) "adcq $0,%[res]" : [res] "+r"(temp64) : [src] "r"(buff), "m"(*(const char(*)[40])buff)); - return csum_tail(temp64, odd); + return csum_finalize_sum(temp64); } if (unlikely(len >= 64)) { /* @@ -143,7 +115,7 @@ __wsum csum_partial(const void *buff, int len, __wsum sum) : [res] "+r"(temp64) : [trail] "r"(trail)); } - return csum_tail(temp64, odd); + return csum_finalize_sum(temp64); } EXPORT_SYMBOL(csum_partial);