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01cfbad79a
This patch updates all instances of csum_tcpudp_magic and csum_tcpudp_nofold to reflect the types that are usually used as the source inputs. For example the protocol field is populated based on nexthdr which is actually an unsigned 8 bit value. The length is usually populated based on skb->len which is an unsigned integer. This addresses an issue in which the IPv6 function csum_ipv6_magic was generating a checksum using the full 32b of skb->len while csum_tcpudp_magic was only using the lower 16 bits. As a result we could run into issues when attempting to adjust the checksum as there was no protocol agnostic way to update it. With this change the value is still truncated as many architectures use "(len + proto) << 8", however this truncation only occurs for values greater than 16776960 in length and as such is unlikely to occur as we stop the inner headers at ~64K in size. I did have to make a few minor changes in the arm, mn10300, nios2, and score versions of the function in order to support these changes as they were either using things such as an OR to combine the protocol and length, or were using ntohs to convert the length which would have truncated the value. I also updated a few spots in terms of whitespace and type differences for the addresses. Most of this was just to make sure all of the definitions were in sync going forward. Signed-off-by: Alexander Duyck <aduyck@mirantis.com> Signed-off-by: David S. Miller <davem@davemloft.net>
35 lines
947 B
C
35 lines
947 B
C
/*
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* Copyright (C) 2011 Texas Instruments Incorporated
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* Author: Mark Salter <msalter@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_C6X_CHECKSUM_H
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#define _ASM_C6X_CHECKSUM_H
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static inline __wsum
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
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__u8 proto, __wsum sum)
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{
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unsigned long long tmp;
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asm ("add .d1 %1,%5,%1\n"
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"|| addu .l1 %3,%4,%0\n"
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"addu .l1 %2,%0,%0\n"
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#ifndef CONFIG_CPU_BIG_ENDIAN
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"|| shl .s1 %1,8,%1\n"
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#endif
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"addu .l1 %1,%0,%0\n"
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"add .l1 %P0,%p0,%2\n"
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: "=&a"(tmp), "+a"(len), "+a"(sum)
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: "a" (saddr), "a" (daddr), "a" (proto));
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return sum;
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}
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#define csum_tcpudp_nofold csum_tcpudp_nofold
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#include <asm-generic/checksum.h>
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#endif /* _ASM_C6X_CHECKSUM_H */
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