drivers/net/bnxt/tf_ulp/ulp_matcher.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2014-2020 Broadcom
   3  * All rights reserved.
   4  */
   5
   6 #include "ulp_matcher.h"
   7 #include "ulp_utils.h"
   8
   9 /* Utility function to calculate the class matcher hash */
  10 static uint32_t
  11 ulp_matcher_class_hash_calculate(uint64_t hi_sig, uint64_t lo_sig)
  12 {
  13         uint64_t hash;
  14
  15         hi_sig |= ((hi_sig % BNXT_ULP_CLASS_HID_HIGH_PRIME) <<
  16                    BNXT_ULP_CLASS_HID_SHFTL);
  17         lo_sig |= ((lo_sig % BNXT_ULP_CLASS_HID_LOW_PRIME) <<
  18                    (BNXT_ULP_CLASS_HID_SHFTL + 2));
  19         hash = hi_sig ^ lo_sig;
  20         hash = (hash >> BNXT_ULP_CLASS_HID_SHFTR) & BNXT_ULP_CLASS_HID_MASK;
  21         return (uint32_t)hash;
  22 }
  23
  24 /* Utility function to calculate the action matcher hash */
  25 static uint32_t
  26 ulp_matcher_action_hash_calculate(uint64_t hi_sig)
  27 {
  28         uint64_t hash;
  29
  30         hi_sig |= ((hi_sig % BNXT_ULP_ACT_HID_HIGH_PRIME) <<
  31                    BNXT_ULP_ACT_HID_SHFTL);
  32         hash = hi_sig;
  33         hash = (hash >> BNXT_ULP_ACT_HID_SHFTR) & BNXT_ULP_ACT_HID_MASK;
  34         return (uint32_t)hash;
  35 }
  36
  37 /*
  38  * Function to handle the matching of RTE Flows and validating
  39  * the pattern masks against the flow templates.
  40  */
  41 int32_t
  42 ulp_matcher_pattern_match(struct ulp_rte_parser_params *params,
  43                           uint32_t *class_id)
  44 {
  45         struct bnxt_ulp_class_match_info *class_match;
  46         uint32_t class_hid;
  47         uint8_t vf_to_vf;
  48         uint16_t tmpl_id;
  49
  50         /* determine vf to vf flow */
  51         if (params->dir == ULP_DIR_EGRESS &&
  52             ULP_BITMAP_ISSET(params->act_bitmap.bits,
  53                              BNXT_ULP_ACTION_BIT_VNIC)) {
  54                 vf_to_vf = 1;
  55         } else {
  56                 vf_to_vf = 0;
  57         }
  58
  59         /* calculate the hash of the given flow */
  60         class_hid = ulp_matcher_class_hash_calculate(params->hdr_bitmap.bits,
  61                                                      params->fld_bitmap.bits);
  62
  63         /* validate the calculate hash values */
  64         if (class_hid >= BNXT_ULP_CLASS_SIG_TBL_MAX_SZ)
  65                 goto error;
  66         tmpl_id = ulp_class_sig_tbl[class_hid];
  67         if (!tmpl_id)
  68                 goto error;
  69
  70         class_match = &ulp_class_match_list[tmpl_id];
  71         if (ULP_BITMAP_CMP(&params->hdr_bitmap, &class_match->hdr_sig)) {
  72                 BNXT_TF_DBG(DEBUG, "Proto Header does not match\n");
  73                 goto error;
  74         }
  75         if (ULP_BITMAP_CMP(&params->fld_bitmap, &class_match->field_sig)) {
  76                 BNXT_TF_DBG(DEBUG, "Field signature does not match\n");
  77                 goto error;
  78         }
  79         if (vf_to_vf != class_match->act_vnic) {
  80                 BNXT_TF_DBG(DEBUG, "Vnic Match failed\n");
  81                 goto error;
  82         }
  83         BNXT_TF_DBG(DEBUG, "Found matching pattern template %d\n",
  84                     class_match->class_tid);
  85         *class_id = class_match->class_tid;
  86         return BNXT_TF_RC_SUCCESS;
  87
  88 error:
  89         BNXT_TF_DBG(DEBUG, "Did not find any matching template\n");
  90         *class_id = 0;
  91         return BNXT_TF_RC_ERROR;
  92 }
  93
  94 /*
  95  * Function to handle the matching of RTE Flows and validating
  96  * the action against the flow templates.
  97  */
  98 int32_t
  99 ulp_matcher_action_match(struct ulp_rte_parser_params *params,
 100                          uint32_t *act_id)
 101 {
 102         uint32_t act_hid;
 103         uint16_t tmpl_id;
 104         struct bnxt_ulp_act_match_info *act_match;
 105
 106         /* calculate the hash of the given flow action */
 107         act_hid = ulp_matcher_action_hash_calculate(params->act_bitmap.bits);
 108
 109         /* validate the calculate hash values */
 110         if (act_hid >= BNXT_ULP_ACT_SIG_TBL_MAX_SZ)
 111                 goto error;
 112         tmpl_id = ulp_act_sig_tbl[act_hid];
 113         if (!tmpl_id)
 114                 goto error;
 115
 116         act_match = &ulp_act_match_list[tmpl_id];
 117         if (ULP_BITMAP_CMP(&params->act_bitmap, &act_match->act_sig)) {
 118                 BNXT_TF_DBG(DEBUG, "Action Header does not match\n");
 119                 goto error;
 120         }
 121         *act_id = act_match->act_tid;
 122         BNXT_TF_DBG(DEBUG, "Found matching action template %u\n", *act_id);
 123         return BNXT_TF_RC_SUCCESS;
 124
 125 error:
 126         BNXT_TF_DBG(DEBUG, "Did not find any matching action template\n");
 127         *act_id = 0;
 128         return BNXT_TF_RC_ERROR;
 129 }