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) {
73 mlx5_class_check_handler(__rte_unused const char *key, const char *value,
76 enum mlx5_class *ret = opaque;
78 if (strcmp(value, "vdpa") == 0) {
79 *ret = MLX5_CLASS_VDPA;
80 } else if (strcmp(value, "net") == 0) {
81 *ret = MLX5_CLASS_NET;
83 DRV_LOG(ERR, "Invalid mlx5 class %s. Maybe typo in device"
84 " class argument setting?", value);
85 *ret = MLX5_CLASS_INVALID;
91 mlx5_class_get(struct rte_devargs *devargs)
93 struct rte_kvargs *kvlist;
94 const char *key = MLX5_CLASS_ARG_NAME;
95 enum mlx5_class ret = MLX5_CLASS_NET;
99 kvlist = rte_kvargs_parse(devargs->args, NULL);
102 if (rte_kvargs_count(kvlist, key))
103 rte_kvargs_process(kvlist, key, mlx5_class_check_handler, &ret);
104 rte_kvargs_free(kvlist);
108 #ifdef RTE_IBVERBS_LINK_DLOPEN
111 * Suffix RTE_EAL_PMD_PATH with "-glue".
113 * This function performs a sanity check on RTE_EAL_PMD_PATH before
114 * suffixing its last component.
117 * Output buffer, should be large enough otherwise NULL is returned.
122 * Pointer to @p buf or @p NULL in case suffix cannot be appended.
125 mlx5_glue_path(char *buf, size_t size)
127 static const char *const bad[] = { "/", ".", "..", NULL };
128 const char *path = RTE_EAL_PMD_PATH;
129 size_t len = strlen(path);
133 while (len && path[len - 1] == '/')
135 for (off = len; off && path[off - 1] != '/'; --off)
137 for (i = 0; bad[i]; ++i)
138 if (!strncmp(path + off, bad[i], (int)(len - off)))
140 i = snprintf(buf, size, "%.*s-glue", (int)len, path);
141 if (i == -1 || (size_t)i >= size)
145 RTE_LOG(ERR, PMD, "unable to append \"-glue\" to last component of"
146 " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"), please"
147 " re-configure DPDK");
153 * Initialization routine for run-time dependency on rdma-core.
155 RTE_INIT_PRIO(mlx5_glue_init, CLASS)
159 /* Initialize common log type. */
160 mlx5_common_logtype = rte_log_register("pmd.common.mlx5");
161 if (mlx5_common_logtype >= 0)
162 rte_log_set_level(mlx5_common_logtype, RTE_LOG_NOTICE);
164 * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
165 * huge pages. Calling ibv_fork_init() during init allows
166 * applications to use fork() safely for purposes other than
167 * using this PMD, which is not supported in forked processes.
169 setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
170 /* Match the size of Rx completion entry to the size of a cacheline. */
171 if (RTE_CACHE_LINE_SIZE == 128)
172 setenv("MLX5_CQE_SIZE", "128", 0);
174 * MLX5_DEVICE_FATAL_CLEANUP tells ibv_destroy functions to
175 * cleanup all the Verbs resources even when the device was removed.
177 setenv("MLX5_DEVICE_FATAL_CLEANUP", "1", 1);
178 /* The glue initialization was done earlier by mlx5 common library. */
179 #ifdef RTE_IBVERBS_LINK_DLOPEN
180 char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
181 const char *path[] = {
183 * A basic security check is necessary before trusting
184 * MLX5_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
186 (geteuid() == getuid() && getegid() == getgid() ?
187 getenv("MLX5_GLUE_PATH") : NULL),
189 * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
190 * variant, otherwise let dlopen() look up libraries on its
194 mlx5_glue_path(glue_path, sizeof(glue_path)) : ""),
200 while (!handle && i != RTE_DIM(path)) {
209 end = strpbrk(path[i], ":;");
211 end = path[i] + strlen(path[i]);
217 ret = snprintf(name, sizeof(name), "%.*s%s" MLX5_GLUE,
219 (!len || *(end - 1) == '/') ? "" : "/");
222 if (sizeof(name) != (size_t)ret + 1)
224 DRV_LOG(DEBUG, "Looking for rdma-core glue as "
226 handle = dlopen(name, RTLD_LAZY);
237 DRV_LOG(WARNING, "Cannot load glue library: %s", dlmsg);
240 sym = dlsym(handle, "mlx5_glue");
245 DRV_LOG(ERR, "Cannot resolve glue symbol: %s", dlmsg);
249 #endif /* RTE_IBVERBS_LINK_DLOPEN */
251 /* Glue structure must not contain any NULL pointers. */
255 for (i = 0; i != sizeof(*mlx5_glue) / sizeof(void *); ++i)
256 assert(((const void *const *)mlx5_glue)[i]);
259 if (strcmp(mlx5_glue->version, MLX5_GLUE_VERSION)) {
261 DRV_LOG(ERR, "rdma-core glue \"%s\" mismatch: \"%s\" is "
262 "required", mlx5_glue->version, MLX5_GLUE_VERSION);
265 mlx5_glue->fork_init();
270 DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing"
271 " run-time dependency on rdma-core libraries (libibverbs,"