drivers/net/sfc/sfc_filter.c

   1 /*-
   2  * Copyright (c) 2017 Solarflare Communications Inc.
   3  * All rights reserved.
   4  *
   5  * This software was jointly developed between OKTET Labs (under contract
   6  * for Solarflare) and Solarflare Communications, Inc.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright notice,
  14  *    this list of conditions and the following disclaimer in the documentation
  15  *    and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  19  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  27  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <rte_common.h>
  31
  32 #include "efx.h"
  33
  34 #include "sfc.h"
  35 #include "sfc_log.h"
  36
  37 boolean_t
  38 sfc_filter_is_match_supported(struct sfc_adapter *sa, uint32_t match)
  39 {
  40         struct sfc_filter *filter = &sa->filter;
  41         size_t i;
  42
  43         for (i = 0; i < filter->supported_match_num; ++i) {
  44                 if (match == filter->supported_match[i])
  45                         return B_TRUE;
  46         }
  47
  48         return B_FALSE;
  49 }
  50
  51 static int
  52 sfc_filter_cache_match_supported(struct sfc_adapter *sa)
  53 {
  54         struct sfc_filter *filter = &sa->filter;
  55         size_t num = filter->supported_match_num;
  56         uint32_t *buf = filter->supported_match;
  57         unsigned int retry;
  58         int rc;
  59
  60         /* Just a guess of possibly sufficient entries */
  61         if (num == 0)
  62                 num = 16;
  63
  64         for (retry = 0; retry < 2; ++retry) {
  65                 if (num != filter->supported_match_num) {
  66                         rc = ENOMEM;
  67                         buf = rte_realloc(buf, num * sizeof(*buf), 0);
  68                         if (buf == NULL)
  69                                 goto fail_realloc;
  70                 }
  71
  72                 rc = efx_filter_supported_filters(sa->nic, buf, num, &num);
  73                 if (rc == 0) {
  74                         filter->supported_match_num = num;
  75                         filter->supported_match = buf;
  76
  77                         return 0;
  78                 } else if (rc != ENOSPC) {
  79                         goto fail_efx_filter_supported_filters;
  80                 }
  81         }
  82
  83         SFC_ASSERT(rc == ENOSPC);
  84
  85 fail_efx_filter_supported_filters:
  86 fail_realloc:
  87         /* Original pointer is not freed by rte_realloc() on failure */
  88         rte_free(buf);
  89         filter->supported_match = NULL;
  90         filter->supported_match_num = 0;
  91         return rc;
  92 }
  93
  94 int
  95 sfc_filter_attach(struct sfc_adapter *sa)
  96 {
  97         int rc;
  98
  99         sfc_log_init(sa, "entry");
 100
 101         rc = efx_filter_init(sa->nic);
 102         if (rc != 0)
 103                 goto fail_filter_init;
 104
 105         rc = sfc_filter_cache_match_supported(sa);
 106         if (rc != 0)
 107                 goto fail_cache_match_supported;
 108
 109         efx_filter_fini(sa->nic);
 110
 111         sfc_log_init(sa, "done");
 112
 113         return 0;
 114
 115 fail_cache_match_supported:
 116         efx_filter_fini(sa->nic);
 117
 118 fail_filter_init:
 119         sfc_log_init(sa, "failed %d", rc);
 120         return rc;
 121 }
 122
 123 void
 124 sfc_filter_detach(struct sfc_adapter *sa)
 125 {
 126         struct sfc_filter *filter = &sa->filter;
 127
 128         sfc_log_init(sa, "entry");
 129
 130         rte_free(filter->supported_match);
 131         filter->supported_match = NULL;
 132         filter->supported_match_num = 0;
 133
 134         sfc_log_init(sa, "done");
 135 }