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| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
|---|---|
| 2 | /* |
| 3 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| 4 | * |
| 5 | * Joern Rennecke <joern.rennecke@embecosm.com>: Jan 2012 |
| 6 | * -Insn Scheduling improvements to csum core routines. |
| 7 | * = csum_fold( ) largely derived from ARM version. |
| 8 | * = ip_fast_cum( ) to have module scheduling |
| 9 | * -gcc 4.4.x broke networking. Alias analysis needed to be primed. |
| 10 | * worked around by adding memory clobber to ip_fast_csum( ) |
| 11 | * |
| 12 | * vineetg: May 2010 |
| 13 | * -Rewrote ip_fast_cscum( ) and csum_fold( ) with fast inline asm |
| 14 | */ |
| 15 | |
| 16 | #ifndef _ASM_ARC_CHECKSUM_H |
| 17 | #define _ASM_ARC_CHECKSUM_H |
| 18 | |
| 19 | /* |
| 20 | * Fold a partial checksum |
| 21 | * |
| 22 | * The 2 swords comprising the 32bit sum are added, any carry to 16th bit |
| 23 | * added back and final sword result inverted. |
| 24 | */ |
| 25 | static inline __sum16 csum_fold(__wsum s) |
| 26 | { |
| 27 | unsigned int r = s << 16 | s >> 16; /* ror */ |
| 28 | s = ~s; |
| 29 | s -= r; |
| 30 | return s >> 16; |
| 31 | } |
| 32 | |
| 33 | /* |
| 34 | * This is a version of ip_compute_csum() optimized for IP headers, |
| 35 | * which always checksum on 4 octet boundaries. |
| 36 | */ |
| 37 | static inline __sum16 |
| 38 | ip_fast_csum(const void *iph, unsigned int ihl) |
| 39 | { |
| 40 | const void *ptr = iph; |
| 41 | unsigned int tmp, tmp2, sum; |
| 42 | |
| 43 | __asm__( |
| 44 | " ld.ab %0, [%3, 4] \n" |
| 45 | " ld.ab %2, [%3, 4] \n" |
| 46 | " sub %1, %4, 2 \n" |
| 47 | " lsr.f lp_count, %1, 1 \n" |
| 48 | " bcc 0f \n" |
| 49 | " add.f %0, %0, %2 \n" |
| 50 | " ld.ab %2, [%3, 4] \n" |
| 51 | "0: lp 1f \n" |
| 52 | " ld.ab %1, [%3, 4] \n" |
| 53 | " adc.f %0, %0, %2 \n" |
| 54 | " ld.ab %2, [%3, 4] \n" |
| 55 | " adc.f %0, %0, %1 \n" |
| 56 | "1: adc.f %0, %0, %2 \n" |
| 57 | " add.cs %0,%0,1 \n" |
| 58 | : "=&r"(sum), "=r"(tmp), "=&r"(tmp2), "+&r" (ptr) |
| 59 | : "r"(ihl) |
| 60 | : "cc", "lp_count", "memory"); |
| 61 | |
| 62 | return csum_fold(sum); |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * TCP pseudo Header is 12 bytes: |
| 67 | * SA [4], DA [4], zeroes [1], Proto[1], TCP Seg(hdr+data) Len [2] |
| 68 | */ |
| 69 | static inline __wsum |
| 70 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, |
| 71 | __u8 proto, __wsum sum) |
| 72 | { |
| 73 | __asm__ __volatile__( |
| 74 | " add.f %0, %0, %1 \n" |
| 75 | " adc.f %0, %0, %2 \n" |
| 76 | " adc.f %0, %0, %3 \n" |
| 77 | " adc.f %0, %0, %4 \n" |
| 78 | " adc %0, %0, 0 \n" |
| 79 | : "+&r"(sum) |
| 80 | : "r"(saddr), "r"(daddr), |
| 81 | #ifdef CONFIG_CPU_BIG_ENDIAN |
| 82 | "r"(len), |
| 83 | #else |
| 84 | "r"(len << 8), |
| 85 | #endif |
| 86 | "r"(htons(proto)) |
| 87 | : "cc"); |
| 88 | |
| 89 | return sum; |
| 90 | } |
| 91 | |
| 92 | #define csum_fold csum_fold |
| 93 | #define ip_fast_csum ip_fast_csum |
| 94 | #define csum_tcpudp_nofold csum_tcpudp_nofold |
| 95 | |
| 96 | #include <asm-generic/checksum.h> |
| 97 | |
| 98 | #endif /* _ASM_ARC_CHECKSUM_H */ |
| 99 |
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