1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright 2019 Mellanox Technologies, Ltd
10 #include <rte_errno.h>
12 #include "mlx5_common.h"
13 #include "mlx5_common_utils.h"
14 #include "mlx5_glue.h"
17 int mlx5_common_logtype;
21 * Get PCI information by sysfs device path.
24 * Pointer to device sysfs folder name.
25 * @param[out] pci_addr
26 * PCI bus address output buffer.
29 * 0 on success, a negative errno value otherwise and rte_errno is set.
32 mlx5_dev_to_pci_addr(const char *dev_path,
33 struct rte_pci_addr *pci_addr)
37 MKSTR(path, "%s/device/uevent", dev_path);
39 file = fopen(path, "rb");
44 while (fgets(line, sizeof(line), file) == line) {
45 size_t len = strlen(line);
48 /* Truncate long lines. */
49 if (len == (sizeof(line) - 1))
50 while (line[(len - 1)] != '\n') {
54 line[(len - 1)] = ret;
56 /* Extract information. */
59 "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
63 &pci_addr->function) == 4) {
72 #ifdef RTE_IBVERBS_LINK_DLOPEN
75 * Suffix RTE_EAL_PMD_PATH with "-glue".
77 * This function performs a sanity check on RTE_EAL_PMD_PATH before
78 * suffixing its last component.
81 * Output buffer, should be large enough otherwise NULL is returned.
86 * Pointer to @p buf or @p NULL in case suffix cannot be appended.
89 mlx5_glue_path(char *buf, size_t size)
91 static const char *const bad[] = { "/", ".", "..", NULL };
92 const char *path = RTE_EAL_PMD_PATH;
93 size_t len = strlen(path);
97 while (len && path[len - 1] == '/')
99 for (off = len; off && path[off - 1] != '/'; --off)
101 for (i = 0; bad[i]; ++i)
102 if (!strncmp(path + off, bad[i], (int)(len - off)))
104 i = snprintf(buf, size, "%.*s-glue", (int)len, path);
105 if (i == -1 || (size_t)i >= size)
109 RTE_LOG(ERR, PMD, "unable to append \"-glue\" to last component of"
110 " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"), please"
111 " re-configure DPDK");
117 * Initialization routine for run-time dependency on rdma-core.
119 RTE_INIT_PRIO(mlx5_glue_init, CLASS)
123 /* Initialize common log type. */
124 mlx5_common_logtype = rte_log_register("pmd.common.mlx5");
125 if (mlx5_common_logtype >= 0)
126 rte_log_set_level(mlx5_common_logtype, RTE_LOG_NOTICE);
128 * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
129 * huge pages. Calling ibv_fork_init() during init allows
130 * applications to use fork() safely for purposes other than
131 * using this PMD, which is not supported in forked processes.
133 setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
134 /* Match the size of Rx completion entry to the size of a cacheline. */
135 if (RTE_CACHE_LINE_SIZE == 128)
136 setenv("MLX5_CQE_SIZE", "128", 0);
138 * MLX5_DEVICE_FATAL_CLEANUP tells ibv_destroy functions to
139 * cleanup all the Verbs resources even when the device was removed.
141 setenv("MLX5_DEVICE_FATAL_CLEANUP", "1", 1);
142 /* The glue initialization was done earlier by mlx5 common library. */
143 #ifdef RTE_IBVERBS_LINK_DLOPEN
144 char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
145 const char *path[] = {
147 * A basic security check is necessary before trusting
148 * MLX5_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
150 (geteuid() == getuid() && getegid() == getgid() ?
151 getenv("MLX5_GLUE_PATH") : NULL),
153 * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
154 * variant, otherwise let dlopen() look up libraries on its
158 mlx5_glue_path(glue_path, sizeof(glue_path)) : ""),
164 while (!handle && i != RTE_DIM(path)) {
173 end = strpbrk(path[i], ":;");
175 end = path[i] + strlen(path[i]);
181 ret = snprintf(name, sizeof(name), "%.*s%s" MLX5_GLUE,
183 (!len || *(end - 1) == '/') ? "" : "/");
186 if (sizeof(name) != (size_t)ret + 1)
188 DRV_LOG(DEBUG, "Looking for rdma-core glue as "
190 handle = dlopen(name, RTLD_LAZY);
201 DRV_LOG(WARNING, "Cannot load glue library: %s", dlmsg);
204 sym = dlsym(handle, "mlx5_glue");
209 DRV_LOG(ERR, "Cannot resolve glue symbol: %s", dlmsg);
213 #endif /* RTE_IBVERBS_LINK_DLOPEN */
215 /* Glue structure must not contain any NULL pointers. */
219 for (i = 0; i != sizeof(*mlx5_glue) / sizeof(void *); ++i)
220 assert(((const void *const *)mlx5_glue)[i]);
223 if (strcmp(mlx5_glue->version, MLX5_GLUE_VERSION)) {
225 DRV_LOG(ERR, "rdma-core glue \"%s\" mismatch: \"%s\" is "
226 "required", mlx5_glue->version, MLX5_GLUE_VERSION);
229 mlx5_glue->fork_init();
234 DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing"
235 " run-time dependency on rdma-core libraries (libibverbs,"