lib/librte_acl/acl_run_scalar.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include "acl_run.h"
   6
   7 /*
   8  * Resolve priority for multiple results (scalar version).
   9  * This consists comparing the priority of the current traversal with the
  10  * running set of results for the packet.
  11  * For each result, keep a running array of the result (rule number) and
  12  * its priority for each category.
  13  */
  14 static inline void
  15 resolve_priority_scalar(uint64_t transition, int n,
  16         const struct rte_acl_ctx *ctx, struct parms *parms,
  17         const struct rte_acl_match_results *p, uint32_t categories)
  18 {
  19         uint32_t i;
  20         int32_t *saved_priority;
  21         uint32_t *saved_results;
  22         const int32_t *priority;
  23         const uint32_t *results;
  24
  25         saved_results = parms[n].cmplt->results;
  26         saved_priority = parms[n].cmplt->priority;
  27
  28         /* results and priorities for completed trie */
  29         results = p[transition].results;
  30         priority = p[transition].priority;
  31
  32         /* if this is not the first completed trie */
  33         if (parms[n].cmplt->count != ctx->num_tries) {
  34                 for (i = 0; i < categories; i += RTE_ACL_RESULTS_MULTIPLIER) {
  35
  36                         if (saved_priority[i] <= priority[i]) {
  37                                 saved_priority[i] = priority[i];
  38                                 saved_results[i] = results[i];
  39                         }
  40                         if (saved_priority[i + 1] <= priority[i + 1]) {
  41                                 saved_priority[i + 1] = priority[i + 1];
  42                                 saved_results[i + 1] = results[i + 1];
  43                         }
  44                         if (saved_priority[i + 2] <= priority[i + 2]) {
  45                                 saved_priority[i + 2] = priority[i + 2];
  46                                 saved_results[i + 2] = results[i + 2];
  47                         }
  48                         if (saved_priority[i + 3] <= priority[i + 3]) {
  49                                 saved_priority[i + 3] = priority[i + 3];
  50                                 saved_results[i + 3] = results[i + 3];
  51                         }
  52                 }
  53         } else {
  54                 for (i = 0; i < categories; i += RTE_ACL_RESULTS_MULTIPLIER) {
  55                         saved_priority[i] = priority[i];
  56                         saved_priority[i + 1] = priority[i + 1];
  57                         saved_priority[i + 2] = priority[i + 2];
  58                         saved_priority[i + 3] = priority[i + 3];
  59
  60                         saved_results[i] = results[i];
  61                         saved_results[i + 1] = results[i + 1];
  62                         saved_results[i + 2] = results[i + 2];
  63                         saved_results[i + 3] = results[i + 3];
  64                 }
  65         }
  66 }
  67
  68 static inline uint32_t
  69 scan_forward(uint32_t input, uint32_t max)
  70 {
  71         return (input == 0) ? max : rte_bsf32(input);
  72 }
  73
  74 static inline uint64_t
  75 scalar_transition(const uint64_t *trans_table, uint64_t transition,
  76         uint8_t input)
  77 {
  78         uint32_t addr, index, ranges, x, a, b, c;
  79
  80         /* break transition into component parts */
  81         ranges = transition >> (sizeof(index) * CHAR_BIT);
  82         index = transition & ~RTE_ACL_NODE_INDEX;
  83         addr = transition ^ index;
  84
  85         if (index != RTE_ACL_NODE_DFA) {
  86                 /* calc address for a QRANGE/SINGLE node */
  87                 c = (uint32_t)input * SCALAR_QRANGE_MULT;
  88                 a = ranges | SCALAR_QRANGE_MIN;
  89                 a -= (c & SCALAR_QRANGE_MASK);
  90                 b = c & SCALAR_QRANGE_MIN;
  91                 a &= SCALAR_QRANGE_MIN;
  92                 a ^= (ranges ^ b) & (a ^ b);
  93                 x = scan_forward(a, 32) >> 3;
  94         } else {
  95                 /* calc address for a DFA node */
  96                 x = ranges >> (input /
  97                         RTE_ACL_DFA_GR64_SIZE * RTE_ACL_DFA_GR64_BIT);
  98                 x &= UINT8_MAX;
  99                 x = input - x;
 100         }
 101
 102         addr += x;
 103
 104         /* pickup next transition */
 105         transition = *(trans_table + addr);
 106         return transition;
 107 }
 108
 109 int
 110 rte_acl_classify_scalar(const struct rte_acl_ctx *ctx, const uint8_t **data,
 111         uint32_t *results, uint32_t num, uint32_t categories)
 112 {
 113         int n;
 114         uint64_t transition0, transition1;
 115         uint32_t input0, input1;
 116         struct acl_flow_data flows;
 117         uint64_t index_array[MAX_SEARCHES_SCALAR];
 118         struct completion cmplt[MAX_SEARCHES_SCALAR];
 119         struct parms parms[MAX_SEARCHES_SCALAR];
 120
 121         acl_set_flow(&flows, cmplt, RTE_DIM(cmplt), data, results, num,
 122                 categories, ctx->trans_table);
 123
 124         for (n = 0; n < MAX_SEARCHES_SCALAR; n++) {
 125                 cmplt[n].count = 0;
 126                 index_array[n] = acl_start_next_trie(&flows, parms, n, ctx);
 127         }
 128
 129         transition0 = index_array[0];
 130         transition1 = index_array[1];
 131
 132         while ((transition0 | transition1) & RTE_ACL_NODE_MATCH) {
 133                 transition0 = acl_match_check(transition0,
 134                         0, ctx, parms, &flows, resolve_priority_scalar);
 135                 transition1 = acl_match_check(transition1,
 136                         1, ctx, parms, &flows, resolve_priority_scalar);
 137         }
 138
 139         while (flows.started > 0) {
 140
 141                 input0 = GET_NEXT_4BYTES(parms, 0);
 142                 input1 = GET_NEXT_4BYTES(parms, 1);
 143
 144                 for (n = 0; n < 4; n++) {
 145
 146                         transition0 = scalar_transition(flows.trans,
 147                                 transition0, (uint8_t)input0);
 148                         input0 >>= CHAR_BIT;
 149
 150                         transition1 = scalar_transition(flows.trans,
 151                                 transition1, (uint8_t)input1);
 152                         input1 >>= CHAR_BIT;
 153                 }
 154
 155                 while ((transition0 | transition1) & RTE_ACL_NODE_MATCH) {
 156                         transition0 = acl_match_check(transition0,
 157                                 0, ctx, parms, &flows, resolve_priority_scalar);
 158                         transition1 = acl_match_check(transition1,
 159                                 1, ctx, parms, &flows, resolve_priority_scalar);
 160                 }
 161         }
 162         return 0;
 163 }