1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2015 Cavium, Inc. All rights reserved. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Cavium, Inc nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* Functions to compare multiple of 16 byte keys (up to 128 bytes) */ 35 static int 36 rte_hash_k16_cmp_eq(const void *key1, const void *key2, 37 size_t key_len __rte_unused) 38 { 39 uint64_t x0, x1, y0, y1; 40 41 asm volatile( 42 "ldp %x[x1], %x[x0], [%x[p1]]" 43 : [x1]"=r"(x1), [x0]"=r"(x0) 44 : [p1]"r"(key1) 45 ); 46 asm volatile( 47 "ldp %x[y1], %x[y0], [%x[p2]]" 48 : [y1]"=r"(y1), [y0]"=r"(y0) 49 : [p2]"r"(key2) 50 ); 51 x0 ^= y0; 52 x1 ^= y1; 53 return !(x0 == 0 && x1 == 0); 54 } 55 56 static int 57 rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len) 58 { 59 return rte_hash_k16_cmp_eq(key1, key2, key_len) || 60 rte_hash_k16_cmp_eq((const char *) key1 + 16, 61 (const char *) key2 + 16, key_len); 62 } 63 64 static int 65 rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len) 66 { 67 return rte_hash_k16_cmp_eq(key1, key2, key_len) || 68 rte_hash_k16_cmp_eq((const char *) key1 + 16, 69 (const char *) key2 + 16, key_len) || 70 rte_hash_k16_cmp_eq((const char *) key1 + 32, 71 (const char *) key2 + 32, key_len); 72 } 73 74 static int 75 rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len) 76 { 77 return rte_hash_k32_cmp_eq(key1, key2, key_len) || 78 rte_hash_k32_cmp_eq((const char *) key1 + 32, 79 (const char *) key2 + 32, key_len); 80 } 81 82 static int 83 rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len) 84 { 85 return rte_hash_k64_cmp_eq(key1, key2, key_len) || 86 rte_hash_k16_cmp_eq((const char *) key1 + 64, 87 (const char *) key2 + 64, key_len); 88 } 89 90 static int 91 rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len) 92 { 93 return rte_hash_k64_cmp_eq(key1, key2, key_len) || 94 rte_hash_k32_cmp_eq((const char *) key1 + 64, 95 (const char *) key2 + 64, key_len); 96 } 97 98 static int 99 rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len) 100 { 101 return rte_hash_k64_cmp_eq(key1, key2, key_len) || 102 rte_hash_k32_cmp_eq((const char *) key1 + 64, 103 (const char *) key2 + 64, key_len) || 104 rte_hash_k16_cmp_eq((const char *) key1 + 96, 105 (const char *) key2 + 96, key_len); 106 } 107 108 static int 109 rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len) 110 { 111 return rte_hash_k64_cmp_eq(key1, key2, key_len) || 112 rte_hash_k64_cmp_eq((const char *) key1 + 64, 113 (const char *) key2 + 64, key_len); 114 } 115