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;
}
|
