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36 * This file provides functions for managing a whitelist of devices. An EAL
37 * command-line parameter should be used for specifying what devices to
38 * whitelist, and the functions here should be called in handling that
39 * parameter. Then when scanning the PCI bus, the is_whitelisted() function
40 * can be used to query the previously set up whitelist.
43 #include <rte_string_fns.h>
45 #include <rte_debug.h>
48 #include "eal_private.h"
50 static char dev_list_str[4096];
51 static size_t dev_list_str_len = 0;
54 * structure for storing a whitelist entry. Unlike for blacklists, we may
55 * in future use this for dummy NICs not backed by a physical device, e.g.
56 * backed by a file-system object instead, so we store the device path/addr
57 * as a string, rather than as a PCI Bus-Device-Function.
59 static struct whitelist_entry {
60 const char *device_str;
61 const char *device_params;
62 } whitelist[RTE_MAX_ETHPORTS] = { {NULL, NULL} };
64 static unsigned num_wl_entries = 0;
66 /* store a whitelist parameter for later parsing */
68 eal_dev_whitelist_add_entry(const char *entry)
70 dev_list_str_len += rte_snprintf(&dev_list_str[dev_list_str_len],
71 sizeof(dev_list_str)-dev_list_str_len, "%s,", entry);
72 /* check for strings that won't fit (snprintf doesn't go beyond buffer) */
73 if (dev_list_str_len >= sizeof(dev_list_str)) {
74 dev_list_str_len = sizeof(dev_list_str) - 1;
81 /* check if a whitelist has been set up */
83 eal_dev_whitelist_exists(void)
85 return !!dev_list_str_len;
88 /* sanity checks a whitelist entry to ensure device is correct */
90 is_valid_wl_entry(const char *device_str, size_t dev_buf_len)
94 struct rte_pci_addr pci_addr = { .domain = 0 };
96 if (eal_parse_pci_BDF(device_str, &pci_addr) == 0) {
97 size_t n = rte_snprintf(buf, sizeof(buf), PCI_SHORT_PRI_FMT,
98 pci_addr.bus, pci_addr.devid, pci_addr.function);
99 return (n == dev_buf_len) && (!strncmp(buf, device_str, dev_buf_len));
101 if (eal_parse_pci_DomBDF(device_str, &pci_addr) == 0) {
102 size_t n = rte_snprintf(buf, sizeof(buf), PCI_PRI_FMT, pci_addr.domain,
103 pci_addr.bus, pci_addr.devid, pci_addr.function);
104 return (n == dev_buf_len) && (!strncmp(buf, device_str, dev_buf_len));
110 * parse a whitelist string into a set of valid devices. To be called once
111 * all parameters have been added to the whitelist string.
114 eal_dev_whitelist_parse(void)
116 char *devs[RTE_MAX_ETHPORTS + 1] = { NULL };
118 unsigned dev_name_len, j;
120 if (!eal_dev_whitelist_exists())
123 /* strip off any extra commas */
124 if (dev_list_str[dev_list_str_len - 1] == ',')
125 dev_list_str[--dev_list_str_len] = '\0';
127 /* split on commas into separate device entries */
128 num_devs = rte_strsplit(dev_list_str, sizeof(dev_list_str), devs,
129 RTE_MAX_ETHPORTS+1, ',');
130 if (num_devs > RTE_MAX_ETHPORTS) {
131 RTE_LOG(ERR, EAL, "Error, too many devices specified. "
132 "[RTE_MAX_ETHPORTS = %u]\n", (unsigned)RTE_MAX_ETHPORTS);
136 size_t buf_len_rem = sizeof(dev_list_str); /* for tracking buffer length */
137 for (i = 0; i < num_devs; i++) {
138 char *dev_n_params[2]; /* possibly split device name from params*/
140 size_t curr_len = strnlen(devs[i], buf_len_rem);
141 buf_len_rem-= (curr_len + 1);
143 int split_res = rte_strsplit(devs[i], curr_len, dev_n_params, 2, ';');
145 /* device names go lower case, i.e. '00:0A.0' wouldn't work
146 * while '00:0a.0' would. */
147 dev_name_len = strnlen(dev_n_params[0], curr_len);
148 for (j = 0; j < dev_name_len; j++)
149 dev_n_params[0][j] = (char)tolower((int)dev_n_params[0][j]);
153 whitelist[i].device_params = dev_n_params[1]; /* fallthrough */
155 whitelist[i].device_str = dev_n_params[0];
157 default: /* should never ever occur */
158 rte_panic("Fatal error parsing whitelist [--use-device] options\n");
161 if (!is_valid_wl_entry(whitelist[i].device_str,
162 strnlen(whitelist[i].device_str, curr_len))) {
163 RTE_LOG(ERR, EAL, "Error parsing device identifier: '%s'\n",
164 whitelist[i].device_str);
168 num_wl_entries = num_devs;
172 /* check if a device is on the whitelist */
174 eal_dev_is_whitelisted(const char *device_str, const char **params)
177 if (!eal_dev_whitelist_exists())
178 return 0; /* return false if no whitelist set up */
180 for (i = 0; i < num_wl_entries; i++)
181 if (strncmp(device_str, whitelist[i].device_str, 32) == 0) {
183 *params = whitelist[i].device_params;
190 /* clear the whole whitelist */
192 eal_dev_whitelist_clear(void)
194 dev_list_str[0] = '\0';
195 dev_list_str_len = num_wl_entries = 0;