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e90e115a HH |
1 | /* |
2 | * Copyright (c) 2020 Intel Corporation. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | #include <errno.h> | |
19 | #include "dpif-netdev-lookup.h" | |
20 | ||
21 | #include "openvswitch/vlog.h" | |
22 | ||
23 | VLOG_DEFINE_THIS_MODULE(dpif_netdev_lookup); | |
24 | ||
25 | /* Actual list of implementations goes here */ | |
26 | static struct dpcls_subtable_lookup_info_t subtable_lookups[] = { | |
27 | /* The autovalidator implementation will not be used by default, it must | |
28 | * be enabled at compile time to be the default lookup implementation. The | |
29 | * user may enable it at runtime using the normal "prio-set" command if | |
30 | * desired. The compile time default switch is here to enable all unit | |
31 | * tests to transparently run with the autovalidator. | |
32 | */ | |
33 | #ifdef DPCLS_AUTOVALIDATOR_DEFAULT | |
34 | { .prio = 255, | |
35 | #else | |
36 | { .prio = 0, | |
37 | #endif | |
38 | .probe = dpcls_subtable_autovalidator_probe, | |
39 | .name = "autovalidator", }, | |
40 | ||
41 | /* The default scalar C code implementation. */ | |
42 | { .prio = 1, | |
43 | .probe = dpcls_subtable_generic_probe, | |
44 | .name = "generic", }, | |
352b6c71 HH |
45 | |
46 | #if (__x86_64__ && HAVE_AVX512F && HAVE_LD_AVX512_GOOD && __SSE4_2__) | |
47 | /* Only available on x86_64 bit builds with SSE 4.2 used for OVS core. */ | |
48 | { .prio = 0, | |
49 | .probe = dpcls_subtable_avx512_gather_probe, | |
50 | .name = "avx512_gather", }, | |
51 | #else | |
52 | /* Disabling AVX512 at compile time, as compile time requirements not met. | |
53 | * This could be due to a number of reasons: | |
54 | * 1) core OVS is not compiled with SSE4.2 instruction set. | |
55 | * The SSE42 instructions are required to use CRC32 ISA for high- | |
56 | * performance hashing. Consider ./configure of OVS with -msse42 (or | |
57 | * newer) to enable CRC32 hashing and higher performance. | |
58 | * 2) The assembler in binutils versions 2.30 and 2.31 has bugs in AVX512 | |
59 | * assembly. Compile time probes check for this assembler issue, and | |
60 | * disable the HAVE_LD_AVX512_GOOD check if an issue is detected. | |
61 | * Please upgrade binutils, or backport this binutils fix commit: | |
62 | * 2069ccaf8dc28ea699bd901fdd35d90613e4402a | |
63 | */ | |
64 | #endif | |
e90e115a HH |
65 | }; |
66 | ||
67 | int32_t | |
68 | dpcls_subtable_lookup_info_get(struct dpcls_subtable_lookup_info_t **out_ptr) | |
69 | { | |
70 | if (out_ptr == NULL) { | |
71 | return -1; | |
72 | } | |
73 | ||
74 | *out_ptr = subtable_lookups; | |
75 | return ARRAY_SIZE(subtable_lookups); | |
76 | } | |
77 | ||
78 | /* sets the priority of the lookup function with "name". */ | |
79 | int32_t | |
80 | dpcls_subtable_set_prio(const char *name, uint8_t priority) | |
81 | { | |
82 | for (int i = 0; i < ARRAY_SIZE(subtable_lookups); i++) { | |
83 | if (strcmp(name, subtable_lookups[i].name) == 0) { | |
84 | subtable_lookups[i].prio = priority; | |
85 | VLOG_INFO("Subtable function '%s' set priority to %d\n", | |
86 | name, priority); | |
87 | return 0; | |
88 | } | |
89 | } | |
90 | VLOG_WARN("Subtable function '%s' not found, failed to set priority\n", | |
91 | name); | |
92 | return -EINVAL; | |
93 | } | |
94 | ||
95 | dpcls_subtable_lookup_func | |
96 | dpcls_subtable_get_best_impl(uint32_t u0_bit_count, uint32_t u1_bit_count) | |
97 | { | |
98 | /* Iter over each subtable impl, and get highest priority one. */ | |
99 | int32_t prio = -1; | |
100 | const char *name = NULL; | |
101 | dpcls_subtable_lookup_func best_func = NULL; | |
102 | ||
103 | for (int i = 0; i < ARRAY_SIZE(subtable_lookups); i++) { | |
104 | int32_t probed_prio = subtable_lookups[i].prio; | |
105 | if (probed_prio > prio) { | |
106 | dpcls_subtable_lookup_func probed_func; | |
107 | probed_func = subtable_lookups[i].probe(u0_bit_count, | |
108 | u1_bit_count); | |
109 | if (probed_func) { | |
110 | best_func = probed_func; | |
111 | prio = probed_prio; | |
112 | name = subtable_lookups[i].name; | |
113 | } | |
114 | } | |
115 | } | |
116 | ||
117 | VLOG_DBG("Subtable lookup function '%s' with units (%d,%d), priority %d\n", | |
118 | name, u0_bit_count, u1_bit_count, prio); | |
119 | ||
120 | /* Programming error - we must always return a valid func ptr. */ | |
121 | ovs_assert(best_func != NULL); | |
122 | ||
123 | return best_func; | |
124 | } |