1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright 2020 Mellanox Technologies, Ltd
8 #ifdef RTE_IBVERBS_LINK_DLOPEN
14 #include <rte_errno.h>
15 #include <rte_string_fns.h>
17 #include "mlx5_common.h"
18 #include "mlx5_common_utils.h"
19 #include "mlx5_glue.h"
22 const struct mlx5_glue *mlx5_glue;
26 * Get PCI information by sysfs device path.
29 * Pointer to device sysfs folder name.
30 * @param[out] pci_addr
31 * PCI bus address output buffer.
34 * 0 on success, a negative errno value otherwise and rte_errno is set.
37 mlx5_dev_to_pci_addr(const char *dev_path,
38 struct rte_pci_addr *pci_addr)
42 MKSTR(path, "%s/device/uevent", dev_path);
44 file = fopen(path, "rb");
49 while (fgets(line, sizeof(line), file) == line) {
50 size_t len = strlen(line);
53 /* Truncate long lines. */
54 if (len == (sizeof(line) - 1))
55 while (line[(len - 1)] != '\n') {
59 line[(len - 1)] = ret;
61 /* Extract information. */
64 "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
68 &pci_addr->function) == 4) {
78 * Extract port name, as a number, from sysfs or netlink information.
80 * @param[in] port_name_in
81 * String representing the port name.
82 * @param[out] port_info_out
83 * Port information, including port name as a number and port name
87 * port_name field set according to recognized name format.
90 mlx5_translate_port_name(const char *port_name_in,
91 struct mlx5_switch_info *port_info_out)
93 char pf_c1, pf_c2, vf_c1, vf_c2;
98 * Check for port-name as a string of the form pf0vf0
99 * (support kernel ver >= 5.0 or OFED ver >= 4.6).
101 sc_items = sscanf(port_name_in, "%c%c%d%c%c%d",
102 &pf_c1, &pf_c2, &port_info_out->pf_num,
103 &vf_c1, &vf_c2, &port_info_out->port_name);
105 pf_c1 == 'p' && pf_c2 == 'f' &&
106 vf_c1 == 'v' && vf_c2 == 'f') {
107 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_PFVF;
111 * Check for port-name as a string of the form p0
112 * (support kernel ver >= 5.0, or OFED ver >= 4.6).
114 sc_items = sscanf(port_name_in, "%c%d",
115 &pf_c1, &port_info_out->port_name);
116 if (sc_items == 2 && pf_c1 == 'p') {
117 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UPLINK;
120 /* Check for port-name as a number (support kernel ver < 5.0 */
122 port_info_out->port_name = strtol(port_name_in, &end, 0);
124 (size_t)(end - port_name_in) == strlen(port_name_in)) {
125 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_LEGACY;
128 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UNKNOWN;
132 * Get kernel interface name from IB device path.
134 * @param[in] ibdev_path
135 * Pointer to IB device path.
137 * Interface name output buffer.
140 * 0 on success, a negative errno value otherwise and rte_errno is set.
143 mlx5_get_ifname_sysfs(const char *ibdev_path, char *ifname)
147 unsigned int dev_type = 0;
148 unsigned int dev_port_prev = ~0u;
149 char match[IF_NAMESIZE] = "";
151 MLX5_ASSERT(ibdev_path);
153 MKSTR(path, "%s/device/net", ibdev_path);
161 while ((dent = readdir(dir)) != NULL) {
162 char *name = dent->d_name;
164 unsigned int dev_port;
167 if ((name[0] == '.') &&
168 ((name[1] == '\0') ||
169 ((name[1] == '.') && (name[2] == '\0'))))
172 MKSTR(path, "%s/device/net/%s/%s",
174 (dev_type ? "dev_id" : "dev_port"));
176 file = fopen(path, "rb");
181 * Switch to dev_id when dev_port does not exist as
182 * is the case with Linux kernel versions < 3.15.
193 r = fscanf(file, (dev_type ? "%x" : "%u"), &dev_port);
198 * Switch to dev_id when dev_port returns the same value for
199 * all ports. May happen when using a MOFED release older than
200 * 3.0 with a Linux kernel >= 3.15.
202 if (dev_port == dev_port_prev)
204 dev_port_prev = dev_port;
206 strlcpy(match, name, IF_NAMESIZE);
209 if (match[0] == '\0') {
213 strncpy(ifname, match, IF_NAMESIZE);
220 * Suffix RTE_EAL_PMD_PATH with "-glue".
222 * This function performs a sanity check on RTE_EAL_PMD_PATH before
223 * suffixing its last component.
226 * Output buffer, should be large enough otherwise NULL is returned.
231 * Pointer to @p buf or @p NULL in case suffix cannot be appended.
234 mlx5_glue_path(char *buf, size_t size)
236 static const char *const bad[] = { "/", ".", "..", NULL };
237 const char *path = RTE_EAL_PMD_PATH;
238 size_t len = strlen(path);
242 while (len && path[len - 1] == '/')
244 for (off = len; off && path[off - 1] != '/'; --off)
246 for (i = 0; bad[i]; ++i)
247 if (!strncmp(path + off, bad[i], (int)(len - off)))
249 i = snprintf(buf, size, "%.*s-glue", (int)len, path);
250 if (i == -1 || (size_t)i >= size)
254 RTE_LOG(ERR, PMD, "unable to append \"-glue\" to last component of"
255 " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"), please"
256 " re-configure DPDK");
261 mlx5_glue_dlopen(void)
263 char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
266 char const *path[] = {
268 * A basic security check is necessary before trusting
269 * MLX5_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
271 (geteuid() == getuid() && getegid() == getgid() ?
272 getenv("MLX5_GLUE_PATH") : NULL),
274 * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
275 * variant, otherwise let dlopen() look up libraries on its
279 mlx5_glue_path(glue_path, sizeof(glue_path)) : ""),
285 while (!handle && i != RTE_DIM(path)) {
294 end = strpbrk(path[i], ":;");
296 end = path[i] + strlen(path[i]);
302 ret = snprintf(name, sizeof(name), "%.*s%s" MLX5_GLUE,
304 (!len || *(end - 1) == '/') ? "" : "/");
307 if (sizeof(name) != (size_t)ret + 1)
309 DRV_LOG(DEBUG, "Looking for rdma-core glue as "
311 handle = dlopen(name, RTLD_LAZY);
322 DRV_LOG(WARNING, "Cannot load glue library: %s", dlmsg);
325 sym = dlsym(handle, "mlx5_glue");
330 DRV_LOG(ERR, "Cannot resolve glue symbol: %s", dlmsg);
345 * Initialization routine for run-time dependency on rdma-core.
348 mlx5_glue_constructor(void)
351 * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
352 * huge pages. Calling ibv_fork_init() during init allows
353 * applications to use fork() safely for purposes other than
354 * using this PMD, which is not supported in forked processes.
356 setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
357 /* Match the size of Rx completion entry to the size of a cacheline. */
358 if (RTE_CACHE_LINE_SIZE == 128)
359 setenv("MLX5_CQE_SIZE", "128", 0);
361 * MLX5_DEVICE_FATAL_CLEANUP tells ibv_destroy functions to
362 * cleanup all the Verbs resources even when the device was removed.
364 setenv("MLX5_DEVICE_FATAL_CLEANUP", "1", 1);
367 if (mlx5_glue_dlopen() != 0)
371 #ifdef RTE_LIBRTE_MLX5_DEBUG
372 /* Glue structure must not contain any NULL pointers. */
376 for (i = 0; i != sizeof(*mlx5_glue) / sizeof(void *); ++i)
377 MLX5_ASSERT(((const void *const *)mlx5_glue)[i]);
380 if (strcmp(mlx5_glue->version, MLX5_GLUE_VERSION)) {
382 DRV_LOG(ERR, "rdma-core glue \"%s\" mismatch: \"%s\" is "
383 "required", mlx5_glue->version, MLX5_GLUE_VERSION);
386 mlx5_glue->fork_init();
390 DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing"
391 " run-time dependency on rdma-core libraries (libibverbs,"