diff options
Diffstat (limited to 'include/asm-s390/checksum.h')
| -rw-r--r-- | include/asm-s390/checksum.h | 59 |
1 files changed, 15 insertions, 44 deletions
diff --git a/include/asm-s390/checksum.h b/include/asm-s390/checksum.h index 0a3cd7ec8451..d5a8e7c1477c 100644 --- a/include/asm-s390/checksum.h +++ b/include/asm-s390/checksum.h @@ -121,50 +121,21 @@ csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, unsigned short proto, __wsum sum) { -#ifndef __s390x__ - asm volatile( - " alr %0,%1\n" /* sum += saddr */ - " brc 12,0f\n" - " ahi %0,1\n" /* add carry */ - "0:" - : "+&d" (sum) : "d" (saddr) : "cc"); - asm volatile( - " alr %0,%1\n" /* sum += daddr */ - " brc 12,1f\n" - " ahi %0,1\n" /* add carry */ - "1:" - : "+&d" (sum) : "d" (daddr) : "cc"); - asm volatile( - " alr %0,%1\n" /* sum += len + proto */ - " brc 12,2f\n" - " ahi %0,1\n" /* add carry */ - "2:" - : "+&d" (sum) - : "d" (len + proto) - : "cc"); -#else /* __s390x__ */ - asm volatile( - " lgfr %0,%0\n" - " algr %0,%1\n" /* sum += saddr */ - " brc 12,0f\n" - " aghi %0,1\n" /* add carry */ - "0: algr %0,%2\n" /* sum += daddr */ - " brc 12,1f\n" - " aghi %0,1\n" /* add carry */ - "1: algfr %0,%3\n" /* sum += len + proto */ - " brc 12,2f\n" - " aghi %0,1\n" /* add carry */ - "2: srlg 0,%0,32\n" - " alr %0,0\n" /* fold to 32 bits */ - " brc 12,3f\n" - " ahi %0,1\n" /* add carry */ - "3: llgfr %0,%0" - : "+&d" (sum) - : "d" (saddr), "d" (daddr), - "d" (len + proto) - : "cc", "0"); -#endif /* __s390x__ */ - return sum; + __u32 csum = (__force __u32)sum; + + csum += (__force __u32)saddr; + if (csum < (__force __u32)saddr) + csum++; + + csum += (__force __u32)daddr; + if (csum < (__force __u32)daddr) + csum++; + + csum += len + proto; + if (csum < len + proto) + csum++; + + return (__force __wsum)csum; } /* |