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* inet_chksum.c: Allow choice of one of the sample algorithms to be

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made from lwipopts.h. Fix comment on how to override LWIP_CHKSUM.
This commit is contained in:
jifl 2008-03-10 16:12:31 +00:00
parent f067d34392
commit a48370d5e9
2 changed files with 23 additions and 9 deletions
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4
CHANGELOG
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@ -19,6 +19,10 @@ HISTORY
++ New features:
2008-03-10 Jonathan Larmour
* inet_chksum.c: Allow choice of one of the sample algorithms to be
made from lwipopts.h. Fix comment on how to override LWIP_CHKSUM.
2008-01-22 Frédéric Bernon
* tcp.c, tcp_in.c, tcp.h, opt.h: Rename LWIP_CALCULATE_EFF_SEND_MSS in
TCP_CALCULATE_EFF_SEND_MSS to have coherent TCP options names.

28
src/core/ipv4/inet_chksum.c
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@ -46,14 +46,26 @@
/* These are some reference implementations of the checksum algorithm, with the
* aim of being simple, correct and fully portable. Checksumming is the
* first thing you would want to optimize for your platform. If you create
* your own version, link it in and in your sys_arch.h put:
* your own version, link it in and in your cc.h put:
*
* #define LWIP_CHKSUM <your_checksum_routine>
*/
#ifndef LWIP_CHKSUM
#define LWIP_CHKSUM lwip_standard_chksum
*
* Or you can select from the implementations below by defining
* LWIP_CHKSUM_ALGORITHM to 1, 2 or 3.
*/
#if 1 /* Version A */
#ifndef LWIP_CHKSUM
# define LWIP_CHKSUM lwip_standard_chksum
# ifndef LWIP_CHKSUM_ALGORITHM
# define LWIP_CHKSUM_ALGORITHM 1
# endif
#endif
/* If none set: */
#ifndef LWIP_CHKSUM_ALGORITHM
# define LWIP_CHKSUM_ALGORITHM 0
#endif
#if (LWIP_CHKSUM_ALGORITHM == 1) /* Version #1 */
/**
* lwip checksum
*
@ -104,7 +116,7 @@ lwip_standard_chksum(void *dataptr, u16_t len)
}
#endif
#if 0 /* Version B */
#if (LWIP_CHKSUM_ALGORITHM == 2) /* Alternative version #2 */
/*
* Curt McDowell
* Broadcom Corp.
@ -160,7 +172,7 @@ lwip_standard_chksum(void *dataptr, int len)
}
#endif
#if 0 /* Version C */
#if (LWIP_CHKSUM_ALGORITHM == 3) /* Alternative version #3 */
/**
* An optimized checksum routine. Basically, it uses loop-unrolling on
* the checksum loop, treating the head and tail bytes specially, whereas
@ -236,8 +248,6 @@ lwip_standard_chksum(void *dataptr, int len)
}
#endif
#endif /* LWIP_CHKSUM */
/* inet_chksum_pseudo:
*
* Calculates the pseudo Internet checksum used by TCP and UDP for a pbuf chain.