1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright 2020 Mellanox Technologies, Ltd 3 */ 4 5 #include <unistd.h> 6 #include <string.h> 7 #include <stdio.h> 8 #ifdef RTE_IBVERBS_LINK_DLOPEN 9 #include <dlfcn.h> 10 #endif 11 #include <dirent.h> 12 #include <net/if.h> 13 14 #include <rte_errno.h> 15 #include <rte_string_fns.h> 16 17 #include "mlx5_common.h" 18 #include "mlx5_common_utils.h" 19 #include "mlx5_glue.h" 20 21 #ifdef MLX5_GLUE 22 const struct mlx5_glue *mlx5_glue; 23 #endif 24 25 /** 26 * Get PCI information by sysfs device path. 27 * 28 * @param dev_path 29 * Pointer to device sysfs folder name. 30 * @param[out] pci_addr 31 * PCI bus address output buffer. 32 * 33 * @return 34 * 0 on success, a negative errno value otherwise and rte_errno is set. 35 */ 36 int 37 mlx5_dev_to_pci_addr(const char *dev_path, 38 struct rte_pci_addr *pci_addr) 39 { 40 FILE *file; 41 char line[32]; 42 MKSTR(path, "%s/device/uevent", dev_path); 43 44 file = fopen(path, "rb"); 45 if (file == NULL) { 46 rte_errno = errno; 47 return -rte_errno; 48 } 49 while (fgets(line, sizeof(line), file) == line) { 50 size_t len = strlen(line); 51 int ret; 52 53 /* Truncate long lines. */ 54 if (len == (sizeof(line) - 1)) 55 while (line[(len - 1)] != '\n') { 56 ret = fgetc(file); 57 if (ret == EOF) 58 break; 59 line[(len - 1)] = ret; 60 } 61 /* Extract information. */ 62 if (sscanf(line, 63 "PCI_SLOT_NAME=" 64 "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n", 65 &pci_addr->domain, 66 &pci_addr->bus, 67 &pci_addr->devid, 68 &pci_addr->function) == 4) { 69 ret = 0; 70 break; 71 } 72 } 73 fclose(file); 74 return 0; 75 } 76 77 /** 78 * Extract port name, as a number, from sysfs or netlink information. 79 * 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 84 * type if recognized 85 * 86 * @return 87 * port_name field set according to recognized name format. 88 */ 89 void 90 mlx5_translate_port_name(const char *port_name_in, 91 struct mlx5_switch_info *port_info_out) 92 { 93 char pf_c1, pf_c2, vf_c1, vf_c2; 94 char *end; 95 int sc_items; 96 97 /* 98 * Check for port-name as a string of the form pf0vf0 99 * (support kernel ver >= 5.0 or OFED ver >= 4.6). 100 */ 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); 104 if (sc_items == 6 && 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; 108 return; 109 } 110 /* 111 * Check for port-name as a string of the form p0 112 * (support kernel ver >= 5.0, or OFED ver >= 4.6). 113 */ 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; 118 return; 119 } 120 /* Check for port-name as a number (support kernel ver < 5.0 */ 121 errno = 0; 122 port_info_out->port_name = strtol(port_name_in, &end, 0); 123 if (!errno && 124 (size_t)(end - port_name_in) == strlen(port_name_in)) { 125 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_LEGACY; 126 return; 127 } 128 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UNKNOWN; 129 } 130 131 /** 132 * Get kernel interface name from IB device path. 133 * 134 * @param[in] ibdev_path 135 * Pointer to IB device path. 136 * @param[out] ifname 137 * Interface name output buffer. 138 * 139 * @return 140 * 0 on success, a negative errno value otherwise and rte_errno is set. 141 */ 142 int 143 mlx5_get_ifname_sysfs(const char *ibdev_path, char *ifname) 144 { 145 DIR *dir; 146 struct dirent *dent; 147 unsigned int dev_type = 0; 148 unsigned int dev_port_prev = ~0u; 149 char match[IF_NAMESIZE] = ""; 150 151 MLX5_ASSERT(ibdev_path); 152 { 153 MKSTR(path, "%s/device/net", ibdev_path); 154 155 dir = opendir(path); 156 if (dir == NULL) { 157 rte_errno = errno; 158 return -rte_errno; 159 } 160 } 161 while ((dent = readdir(dir)) != NULL) { 162 char *name = dent->d_name; 163 FILE *file; 164 unsigned int dev_port; 165 int r; 166 167 if ((name[0] == '.') && 168 ((name[1] == '\0') || 169 ((name[1] == '.') && (name[2] == '\0')))) 170 continue; 171 172 MKSTR(path, "%s/device/net/%s/%s", 173 ibdev_path, name, 174 (dev_type ? "dev_id" : "dev_port")); 175 176 file = fopen(path, "rb"); 177 if (file == NULL) { 178 if (errno != ENOENT) 179 continue; 180 /* 181 * Switch to dev_id when dev_port does not exist as 182 * is the case with Linux kernel versions < 3.15. 183 */ 184 try_dev_id: 185 match[0] = '\0'; 186 if (dev_type) 187 break; 188 dev_type = 1; 189 dev_port_prev = ~0u; 190 rewinddir(dir); 191 continue; 192 } 193 r = fscanf(file, (dev_type ? "%x" : "%u"), &dev_port); 194 fclose(file); 195 if (r != 1) 196 continue; 197 /* 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. 201 */ 202 if (dev_port == dev_port_prev) 203 goto try_dev_id; 204 dev_port_prev = dev_port; 205 if (dev_port == 0) 206 strlcpy(match, name, IF_NAMESIZE); 207 } 208 closedir(dir); 209 if (match[0] == '\0') { 210 rte_errno = ENOENT; 211 return -rte_errno; 212 } 213 strncpy(ifname, match, IF_NAMESIZE); 214 return 0; 215 } 216 217 #ifdef MLX5_GLUE 218 219 /** 220 * Suffix RTE_EAL_PMD_PATH with "-glue". 221 * 222 * This function performs a sanity check on RTE_EAL_PMD_PATH before 223 * suffixing its last component. 224 * 225 * @param buf[out] 226 * Output buffer, should be large enough otherwise NULL is returned. 227 * @param size 228 * Size of @p out. 229 * 230 * @return 231 * Pointer to @p buf or @p NULL in case suffix cannot be appended. 232 */ 233 static char * 234 mlx5_glue_path(char *buf, size_t size) 235 { 236 static const char *const bad[] = { "/", ".", "..", NULL }; 237 const char *path = RTE_EAL_PMD_PATH; 238 size_t len = strlen(path); 239 size_t off; 240 int i; 241 242 while (len && path[len - 1] == '/') 243 --len; 244 for (off = len; off && path[off - 1] != '/'; --off) 245 ; 246 for (i = 0; bad[i]; ++i) 247 if (!strncmp(path + off, bad[i], (int)(len - off))) 248 goto error; 249 i = snprintf(buf, size, "%.*s-glue", (int)len, path); 250 if (i == -1 || (size_t)i >= size) 251 goto error; 252 return buf; 253 error: 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"); 257 return NULL; 258 } 259 260 static int 261 mlx5_glue_dlopen(void) 262 { 263 char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")]; 264 void *handle = NULL; 265 266 char const *path[] = { 267 /* 268 * A basic security check is necessary before trusting 269 * MLX5_GLUE_PATH, which may override RTE_EAL_PMD_PATH. 270 */ 271 (geteuid() == getuid() && getegid() == getgid() ? 272 getenv("MLX5_GLUE_PATH") : NULL), 273 /* 274 * When RTE_EAL_PMD_PATH is set, use its glue-suffixed 275 * variant, otherwise let dlopen() look up libraries on its 276 * own. 277 */ 278 (*RTE_EAL_PMD_PATH ? 279 mlx5_glue_path(glue_path, sizeof(glue_path)) : ""), 280 }; 281 unsigned int i = 0; 282 void **sym; 283 const char *dlmsg; 284 285 while (!handle && i != RTE_DIM(path)) { 286 const char *end; 287 size_t len; 288 int ret; 289 290 if (!path[i]) { 291 ++i; 292 continue; 293 } 294 end = strpbrk(path[i], ":;"); 295 if (!end) 296 end = path[i] + strlen(path[i]); 297 len = end - path[i]; 298 ret = 0; 299 do { 300 char name[ret + 1]; 301 302 ret = snprintf(name, sizeof(name), "%.*s%s" MLX5_GLUE, 303 (int)len, path[i], 304 (!len || *(end - 1) == '/') ? "" : "/"); 305 if (ret == -1) 306 break; 307 if (sizeof(name) != (size_t)ret + 1) 308 continue; 309 DRV_LOG(DEBUG, "Looking for rdma-core glue as " 310 "\"%s\"", name); 311 handle = dlopen(name, RTLD_LAZY); 312 break; 313 } while (1); 314 path[i] = end + 1; 315 if (!*end) 316 ++i; 317 } 318 if (!handle) { 319 rte_errno = EINVAL; 320 dlmsg = dlerror(); 321 if (dlmsg) 322 DRV_LOG(WARNING, "Cannot load glue library: %s", dlmsg); 323 goto glue_error; 324 } 325 sym = dlsym(handle, "mlx5_glue"); 326 if (!sym || !*sym) { 327 rte_errno = EINVAL; 328 dlmsg = dlerror(); 329 if (dlmsg) 330 DRV_LOG(ERR, "Cannot resolve glue symbol: %s", dlmsg); 331 goto glue_error; 332 } 333 mlx5_glue = *sym; 334 return 0; 335 336 glue_error: 337 if (handle) 338 dlclose(handle); 339 return -1; 340 } 341 342 #endif 343 344 /** 345 * Initialization routine for run-time dependency on rdma-core. 346 */ 347 void 348 mlx5_glue_constructor(void) 349 { 350 /* 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. 355 */ 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); 360 /* 361 * MLX5_DEVICE_FATAL_CLEANUP tells ibv_destroy functions to 362 * cleanup all the Verbs resources even when the device was removed. 363 */ 364 setenv("MLX5_DEVICE_FATAL_CLEANUP", "1", 1); 365 366 #ifdef MLX5_GLUE 367 if (mlx5_glue_dlopen() != 0) 368 goto glue_error; 369 #endif 370 371 #ifdef RTE_LIBRTE_MLX5_DEBUG 372 /* Glue structure must not contain any NULL pointers. */ 373 { 374 unsigned int i; 375 376 for (i = 0; i != sizeof(*mlx5_glue) / sizeof(void *); ++i) 377 MLX5_ASSERT(((const void *const *)mlx5_glue)[i]); 378 } 379 #endif 380 if (strcmp(mlx5_glue->version, MLX5_GLUE_VERSION)) { 381 rte_errno = EINVAL; 382 DRV_LOG(ERR, "rdma-core glue \"%s\" mismatch: \"%s\" is " 383 "required", mlx5_glue->version, MLX5_GLUE_VERSION); 384 goto glue_error; 385 } 386 mlx5_glue->fork_init(); 387 return; 388 389 glue_error: 390 DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing" 391 " run-time dependency on rdma-core libraries (libibverbs," 392 " libmlx5)"); 393 mlx5_glue = NULL; 394 } 395 396