1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright 2020 Mellanox Technologies, Ltd
8 #ifdef RTE_IBVERBS_LINK_DLOPEN
12 #include <rte_errno.h>
14 #include "mlx5_common.h"
15 #include "mlx5_common_utils.h"
16 #include "mlx5_glue.h"
19 const struct mlx5_glue *mlx5_glue;
23 * Get PCI information by sysfs device path.
26 * Pointer to device sysfs folder name.
27 * @param[out] pci_addr
28 * PCI bus address output buffer.
31 * 0 on success, a negative errno value otherwise and rte_errno is set.
34 mlx5_dev_to_pci_addr(const char *dev_path,
35 struct rte_pci_addr *pci_addr)
39 MKSTR(path, "%s/device/uevent", dev_path);
41 file = fopen(path, "rb");
46 while (fgets(line, sizeof(line), file) == line) {
47 size_t len = strlen(line);
50 /* Truncate long lines. */
51 if (len == (sizeof(line) - 1))
52 while (line[(len - 1)] != '\n') {
56 line[(len - 1)] = ret;
58 /* Extract information. */
61 "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
65 &pci_addr->function) == 4) {
75 * Extract port name, as a number, from sysfs or netlink information.
77 * @param[in] port_name_in
78 * String representing the port name.
79 * @param[out] port_info_out
80 * Port information, including port name as a number and port name
84 * port_name field set according to recognized name format.
87 mlx5_translate_port_name(const char *port_name_in,
88 struct mlx5_switch_info *port_info_out)
90 char pf_c1, pf_c2, vf_c1, vf_c2;
95 * Check for port-name as a string of the form pf0vf0
96 * (support kernel ver >= 5.0 or OFED ver >= 4.6).
98 sc_items = sscanf(port_name_in, "%c%c%d%c%c%d",
99 &pf_c1, &pf_c2, &port_info_out->pf_num,
100 &vf_c1, &vf_c2, &port_info_out->port_name);
102 pf_c1 == 'p' && pf_c2 == 'f' &&
103 vf_c1 == 'v' && vf_c2 == 'f') {
104 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_PFVF;
108 * Check for port-name as a string of the form p0
109 * (support kernel ver >= 5.0, or OFED ver >= 4.6).
111 sc_items = sscanf(port_name_in, "%c%d",
112 &pf_c1, &port_info_out->port_name);
113 if (sc_items == 2 && pf_c1 == 'p') {
114 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UPLINK;
117 /* Check for port-name as a number (support kernel ver < 5.0 */
119 port_info_out->port_name = strtol(port_name_in, &end, 0);
121 (size_t)(end - port_name_in) == strlen(port_name_in)) {
122 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_LEGACY;
125 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UNKNOWN;
131 * Suffix RTE_EAL_PMD_PATH with "-glue".
133 * This function performs a sanity check on RTE_EAL_PMD_PATH before
134 * suffixing its last component.
137 * Output buffer, should be large enough otherwise NULL is returned.
142 * Pointer to @p buf or @p NULL in case suffix cannot be appended.
145 mlx5_glue_path(char *buf, size_t size)
147 static const char *const bad[] = { "/", ".", "..", NULL };
148 const char *path = RTE_EAL_PMD_PATH;
149 size_t len = strlen(path);
153 while (len && path[len - 1] == '/')
155 for (off = len; off && path[off - 1] != '/'; --off)
157 for (i = 0; bad[i]; ++i)
158 if (!strncmp(path + off, bad[i], (int)(len - off)))
160 i = snprintf(buf, size, "%.*s-glue", (int)len, path);
161 if (i == -1 || (size_t)i >= size)
165 RTE_LOG(ERR, PMD, "unable to append \"-glue\" to last component of"
166 " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"), please"
167 " re-configure DPDK");
172 mlx5_glue_dlopen(void)
174 char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
177 char const *path[] = {
179 * A basic security check is necessary before trusting
180 * MLX5_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
182 (geteuid() == getuid() && getegid() == getgid() ?
183 getenv("MLX5_GLUE_PATH") : NULL),
185 * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
186 * variant, otherwise let dlopen() look up libraries on its
190 mlx5_glue_path(glue_path, sizeof(glue_path)) : ""),
196 while (!handle && i != RTE_DIM(path)) {
205 end = strpbrk(path[i], ":;");
207 end = path[i] + strlen(path[i]);
213 ret = snprintf(name, sizeof(name), "%.*s%s" MLX5_GLUE,
215 (!len || *(end - 1) == '/') ? "" : "/");
218 if (sizeof(name) != (size_t)ret + 1)
220 DRV_LOG(DEBUG, "Looking for rdma-core glue as "
222 handle = dlopen(name, RTLD_LAZY);
233 DRV_LOG(WARNING, "Cannot load glue library: %s", dlmsg);
236 sym = dlsym(handle, "mlx5_glue");
241 DRV_LOG(ERR, "Cannot resolve glue symbol: %s", dlmsg);
256 * Initialization routine for run-time dependency on rdma-core.
259 mlx5_glue_constructor(void)
262 * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
263 * huge pages. Calling ibv_fork_init() during init allows
264 * applications to use fork() safely for purposes other than
265 * using this PMD, which is not supported in forked processes.
267 setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
268 /* Match the size of Rx completion entry to the size of a cacheline. */
269 if (RTE_CACHE_LINE_SIZE == 128)
270 setenv("MLX5_CQE_SIZE", "128", 0);
272 * MLX5_DEVICE_FATAL_CLEANUP tells ibv_destroy functions to
273 * cleanup all the Verbs resources even when the device was removed.
275 setenv("MLX5_DEVICE_FATAL_CLEANUP", "1", 1);
278 if (mlx5_glue_dlopen() != 0)
282 #ifdef RTE_LIBRTE_MLX5_DEBUG
283 /* Glue structure must not contain any NULL pointers. */
287 for (i = 0; i != sizeof(*mlx5_glue) / sizeof(void *); ++i)
288 MLX5_ASSERT(((const void *const *)mlx5_glue)[i]);
291 if (strcmp(mlx5_glue->version, MLX5_GLUE_VERSION)) {
293 DRV_LOG(ERR, "rdma-core glue \"%s\" mismatch: \"%s\" is "
294 "required", mlx5_glue->version, MLX5_GLUE_VERSION);
297 mlx5_glue->fork_init();
301 DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing"
302 " run-time dependency on rdma-core libraries (libibverbs,"