63b6b10670
Improves network performance in some cases when checksum offload is not available Signed-off-by: Felix Fietkau <nbd@nbd.name>
29 lines
989 B
Diff
29 lines
989 B
Diff
From: Robin Murphy <robin.murphy@arm.com>
|
|
Date: Fri, 17 Jan 2020 15:48:39 +0000
|
|
Subject: [PATCH] arm64: csum: Fix pathological zero-length calls
|
|
|
|
In validating the checksumming results of the new routine, I sadly
|
|
neglected to test its not-checksumming results. Thus it slipped through
|
|
that the one case where @buff is already dword-aligned and @len = 0
|
|
manages to defeat the tail-masking logic and behave as if @len = 8.
|
|
For a zero length it doesn't make much sense to deference @buff anyway,
|
|
so just add an early return (which has essentially zero impact on
|
|
performance).
|
|
|
|
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
|
|
Signed-off-by: Will Deacon <will@kernel.org>
|
|
---
|
|
|
|
--- a/arch/arm64/lib/csum.c
|
|
+++ b/arch/arm64/lib/csum.c
|
|
@@ -20,6 +20,9 @@ unsigned int do_csum(const unsigned char
|
|
const u64 *ptr;
|
|
u64 data, sum64 = 0;
|
|
|
|
+ if (unlikely(len == 0))
|
|
+ return 0;
|
|
+
|
|
offset = (unsigned long)buff & 7;
|
|
/*
|
|
* This is to all intents and purposes safe, since rounding down cannot
|