lib/librte_ethdev/ethdev_private.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Gaëtan Rivet
   3  */
   4
   5 #include "rte_ethdev.h"
   6 #include "ethdev_driver.h"
   7 #include "ethdev_private.h"
   8
   9 uint16_t
  10 eth_dev_to_id(const struct rte_eth_dev *dev)
  11 {
  12         if (dev == NULL)
  13                 return RTE_MAX_ETHPORTS;
  14         return dev - rte_eth_devices;
  15 }
  16
  17 struct rte_eth_dev *
  18 eth_find_device(const struct rte_eth_dev *start, rte_eth_cmp_t cmp,
  19                 const void *data)
  20 {
  21         struct rte_eth_dev *edev;
  22         ptrdiff_t idx;
  23
  24         /* Avoid Undefined Behaviour */
  25         if (start != NULL &&
  26             (start < &rte_eth_devices[0] ||
  27              start > &rte_eth_devices[RTE_MAX_ETHPORTS]))
  28                 return NULL;
  29         if (start != NULL)
  30                 idx = eth_dev_to_id(start) + 1;
  31         else
  32                 idx = 0;
  33         for (; idx < RTE_MAX_ETHPORTS; idx++) {
  34                 edev = &rte_eth_devices[idx];
  35                 if (cmp(edev, data) == 0)
  36                         return edev;
  37         }
  38         return NULL;
  39 }
  40
  41 /* Put new value into list. */
  42 static int
  43 rte_eth_devargs_enlist(uint16_t *list, uint16_t *len_list,
  44                        const uint16_t max_list, uint16_t val)
  45 {
  46         uint16_t i;
  47
  48         for (i = 0; i < *len_list; i++) {
  49                 if (list[i] == val)
  50                         return 0;
  51         }
  52         if (*len_list >= max_list)
  53                 return -1;
  54         list[(*len_list)++] = val;
  55         return 0;
  56 }
  57
  58 /* Parse and enlist a range expression of "min-max" or a single value. */
  59 static char *
  60 rte_eth_devargs_process_range(char *str, uint16_t *list, uint16_t *len_list,
  61         const uint16_t max_list)
  62 {
  63         uint16_t lo, hi, val;
  64         int result, n = 0;
  65         char *pos = str;
  66
  67         result = sscanf(str, "%hu%n-%hu%n", &lo, &n, &hi, &n);
  68         if (result == 1) {
  69                 if (rte_eth_devargs_enlist(list, len_list, max_list, lo) != 0)
  70                         return NULL;
  71         } else if (result == 2) {
  72                 if (lo > hi)
  73                         return NULL;
  74                 for (val = lo; val <= hi; val++) {
  75                         if (rte_eth_devargs_enlist(list, len_list, max_list,
  76                                                    val) != 0)
  77                                 return NULL;
  78                 }
  79         } else
  80                 return NULL;
  81         return pos + n;
  82 }
  83
  84 /*
  85  * Parse list of values separated by ",".
  86  * Each value could be a range [min-max] or single number.
  87  * Examples:
  88  *  2               - single
  89  *  [1,2,3]         - single list
  90  *  [1,3-5,7,9-11]  - list with singles and ranges
  91  */
  92 static char *
  93 rte_eth_devargs_process_list(char *str, uint16_t *list, uint16_t *len_list,
  94         const uint16_t max_list)
  95 {
  96         char *pos = str;
  97
  98         if (*pos == '[')
  99                 pos++;
 100         while (1) {
 101                 pos = rte_eth_devargs_process_range(pos, list, len_list,
 102                                                     max_list);
 103                 if (pos == NULL)
 104                         return NULL;
 105                 if (*pos != ',') /* end of list */
 106                         break;
 107                 pos++;
 108         }
 109         if (*str == '[' && *pos != ']')
 110                 return NULL;
 111         if (*pos == ']')
 112                 pos++;
 113         return pos;
 114 }
 115
 116 /*
 117  * Parse representor ports from a single value or lists.
 118  *
 119  * Representor format:
 120  *   #: range or single number of VF representor - legacy
 121  *   [[c#]pf#]vf#: VF port representor/s
 122  *   [[c#]pf#]sf#: SF port representor/s
 123  *   [c#]pf#:      PF port representor/s
 124  *
 125  * Examples of #:
 126  *  2               - single
 127  *  [1,2,3]         - single list
 128  *  [1,3-5,7,9-11]  - list with singles and ranges
 129  */
 130 int
 131 rte_eth_devargs_parse_representor_ports(char *str, void *data)
 132 {
 133         struct rte_eth_devargs *eth_da = data;
 134
 135         if (str[0] == 'c') {
 136                 str += 1;
 137                 str = rte_eth_devargs_process_list(str, eth_da->mh_controllers,
 138                                 &eth_da->nb_mh_controllers,
 139                                 RTE_DIM(eth_da->mh_controllers));
 140                 if (str == NULL)
 141                         goto done;
 142         }
 143         if (str[0] == 'p' && str[1] == 'f') {
 144                 eth_da->type = RTE_ETH_REPRESENTOR_PF;
 145                 str += 2;
 146                 str = rte_eth_devargs_process_list(str, eth_da->ports,
 147                                 &eth_da->nb_ports, RTE_DIM(eth_da->ports));
 148                 if (str == NULL || str[0] == '\0')
 149                         goto done;
 150         } else if (eth_da->nb_mh_controllers > 0) {
 151                 /* 'c' must followed by 'pf'. */
 152                 str = NULL;
 153                 goto done;
 154         }
 155         if (str[0] == 'v' && str[1] == 'f') {
 156                 eth_da->type = RTE_ETH_REPRESENTOR_VF;
 157                 str += 2;
 158         } else if (str[0] == 's' && str[1] == 'f') {
 159                 eth_da->type = RTE_ETH_REPRESENTOR_SF;
 160                 str += 2;
 161         } else {
 162                 /* 'pf' must followed by 'vf' or 'sf'. */
 163                 if (eth_da->type == RTE_ETH_REPRESENTOR_PF) {
 164                         str = NULL;
 165                         goto done;
 166                 }
 167                 eth_da->type = RTE_ETH_REPRESENTOR_VF;
 168         }
 169         str = rte_eth_devargs_process_list(str, eth_da->representor_ports,
 170                 &eth_da->nb_representor_ports,
 171                 RTE_DIM(eth_da->representor_ports));
 172 done:
 173         if (str == NULL)
 174                 RTE_LOG(ERR, EAL, "wrong representor format: %s\n", str);
 175         return str == NULL ? -1 : 0;
 176 }