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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | // SPDX-License-Identifier: GPL-2.0-only /* * Checksum functions for Hexagon * * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. */ /* This was derived from arch/alpha/lib/checksum.c */ #include <linux/module.h> #include <linux/string.h> #include <asm/byteorder.h> #include <net/checksum.h> #include <linux/uaccess.h> #include <asm/intrinsics.h> /* Vector value operations */ #define SIGN(x, y) ((0x8000ULL*x)<<y) #define CARRY(x, y) ((0x0002ULL*x)<<y) #define SELECT(x, y) ((0x0001ULL*x)<<y) #define VR_NEGATE(a, b, c, d) (SIGN(a, 48) + SIGN(b, 32) + SIGN(c, 16) \ + SIGN(d, 0)) #define VR_CARRY(a, b, c, d) (CARRY(a, 48) + CARRY(b, 32) + CARRY(c, 16) \ + CARRY(d, 0)) #define VR_SELECT(a, b, c, d) (SELECT(a, 48) + SELECT(b, 32) + SELECT(c, 16) \ + SELECT(d, 0)) /* optimized HEXAGON V3 intrinsic version */ static inline unsigned short from64to16(u64 x) { u64 sum; sum = HEXAGON_P_vrmpyh_PP(x^VR_NEGATE(1, 1, 1, 1), VR_SELECT(1, 1, 1, 1)); sum += VR_CARRY(0, 0, 1, 0); sum = HEXAGON_P_vrmpyh_PP(sum, VR_SELECT(0, 0, 1, 1)); return 0xFFFF & sum; } /* * computes the checksum of the TCP/UDP pseudo-header * returns a 16-bit checksum, already complemented. */ __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, __wsum sum) { return (__force __sum16)~from64to16( (__force u64)saddr + (__force u64)daddr + (__force u64)sum + ((len + proto) << 8)); } __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, __wsum sum) { u64 result; result = (__force u64)saddr + (__force u64)daddr + (__force u64)sum + ((len + proto) << 8); /* Fold down to 32-bits so we don't lose in the typedef-less network stack. */ /* 64 to 33 */ result = (result & 0xffffffffUL) + (result >> 32); /* 33 to 32 */ result = (result & 0xffffffffUL) + (result >> 32); return (__force __wsum)result; } EXPORT_SYMBOL(csum_tcpudp_nofold); /* * Do a 64-bit checksum on an arbitrary memory area.. * * This isn't a great routine, but it's not _horrible_ either. The * inner loop could be unrolled a bit further, and there are better * ways to do the carry, but this is reasonable. */ /* optimized HEXAGON intrinsic version, with over read fixed */ unsigned int do_csum(const void *voidptr, int len) { u64 sum0, sum1, x0, x1, *ptr8_o, *ptr8_e, *ptr8; int i, start, mid, end, mask; const char *ptr = voidptr; unsigned short *ptr2; unsigned int *ptr4; if (len <= 0) return 0; start = 0xF & (16-(((int) ptr) & 0xF)) ; mask = 0x7fffffffUL >> HEXAGON_R_cl0_R(len); start = start & mask ; mid = len - start; end = mid & 0xF; mid = mid>>4; sum0 = mid << 18; sum1 = 0; if (start & 1) sum0 += (u64) (ptr[0] << 8); ptr2 = (unsigned short *) &ptr[start & 1]; if (start & 2) sum1 += (u64) ptr2[0]; ptr4 = (unsigned int *) &ptr[start & 3]; if (start & 4) { sum0 = HEXAGON_P_vrmpyhacc_PP(sum0, VR_NEGATE(0, 0, 1, 1)^((u64)ptr4[0]), VR_SELECT(0, 0, 1, 1)); sum0 += VR_SELECT(0, 0, 1, 0); } ptr8 = (u64 *) &ptr[start & 7]; if (start & 8) { sum1 = HEXAGON_P_vrmpyhacc_PP(sum1, VR_NEGATE(1, 1, 1, 1)^(ptr8[0]), VR_SELECT(1, 1, 1, 1)); sum1 += VR_CARRY(0, 0, 1, 0); } ptr8_o = (u64 *) (ptr + start); ptr8_e = (u64 *) (ptr + start + 8); if (mid) { x0 = *ptr8_e; ptr8_e += 2; x1 = *ptr8_o; ptr8_o += 2; if (mid > 1) for (i = 0; i < mid-1; i++) { sum0 = HEXAGON_P_vrmpyhacc_PP(sum0, x0^VR_NEGATE(1, 1, 1, 1), VR_SELECT(1, 1, 1, 1)); sum1 = HEXAGON_P_vrmpyhacc_PP(sum1, x1^VR_NEGATE(1, 1, 1, 1), VR_SELECT(1, 1, 1, 1)); x0 = *ptr8_e; ptr8_e += 2; x1 = *ptr8_o; ptr8_o += 2; } sum0 = HEXAGON_P_vrmpyhacc_PP(sum0, x0^VR_NEGATE(1, 1, 1, 1), VR_SELECT(1, 1, 1, 1)); sum1 = HEXAGON_P_vrmpyhacc_PP(sum1, x1^VR_NEGATE(1, 1, 1, 1), VR_SELECT(1, 1, 1, 1)); } ptr4 = (unsigned int *) &ptr[start + (mid * 16) + (end & 8)]; if (end & 4) { sum1 = HEXAGON_P_vrmpyhacc_PP(sum1, VR_NEGATE(0, 0, 1, 1)^((u64)ptr4[0]), VR_SELECT(0, 0, 1, 1)); sum1 += VR_SELECT(0, 0, 1, 0); } ptr2 = (unsigned short *) &ptr[start + (mid * 16) + (end & 12)]; if (end & 2) sum0 += (u64) ptr2[0]; if (end & 1) sum1 += (u64) ptr[start + (mid * 16) + (end & 14)]; ptr8 = (u64 *) &ptr[start + (mid * 16)]; if (end & 8) { sum0 = HEXAGON_P_vrmpyhacc_PP(sum0, VR_NEGATE(1, 1, 1, 1)^(ptr8[0]), VR_SELECT(1, 1, 1, 1)); sum0 += VR_CARRY(0, 0, 1, 0); } sum0 = HEXAGON_P_vrmpyh_PP((sum0+sum1)^VR_NEGATE(0, 0, 0, 1), VR_SELECT(0, 0, 1, 1)); sum0 += VR_NEGATE(0, 0, 0, 1); sum0 = HEXAGON_P_vrmpyh_PP(sum0, VR_SELECT(0, 0, 1, 1)); if (start & 1) sum0 = (sum0 << 8) | (0xFF & (sum0 >> 8)); return 0xFFFF & sum0; } |