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Don't compute psuedo header checksum if nxt == 0.

This commit is contained in:
matt 2001-05-19 00:04:56 +00:00
parent 9d582d76fc
commit 66d1e28936
1 changed files with 11 additions and 9 deletions
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20
sys/arch/vax/vax/in4_cksum.c
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@ -1,4 +1,4 @@
/* $NetBSD: in4_cksum.c,v 1.2 2001/04/28 09:36:01 ragge Exp $ */
/* $NetBSD: in4_cksum.c,v 1.3 2001/05/19 00:04:56 matt Exp $ */
/*
* Copyright (C) 1999 WIDE Project.
@ -125,14 +125,16 @@ in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len)
panic("in4_cksum: bad mbuf chain");
#endif
__asm __volatile("
movzwl 16(ap),%0 # mov len to sum
addb2 8(ap),%0 # add proto to sum
rotl $8,%0,%0 # htons, carry is preserved
adwc 12(%2),%0 # add src ip
adwc 16(%2),%0 # add dst ip
adwc $0,%0 # clean up carry
" : "=r" (sum) : "0" (sum), "r" (mtod(m, void *)));
if (nxt != 0) {
__asm __volatile("
movzwl 16(ap),%0 # mov len to sum
addb2 8(ap),%0 # add proto to sum
rotl $8,%0,%0 # htons, carry is preserved
adwc 12(%2),%0 # add src ip
adwc 16(%2),%0 # add dst ip
adwc $0,%0 # clean up carry
" : "=r" (sum) : "0" (sum), "r" (mtod(m, void *)));
}
/* skip unnecessary part */
while (m && off > 0) {