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 /* 121 * Check for port-name as a string of the form pf0 122 * (support kernel ver >= 5.7 for HPF representor on BF). 123 */ 124 sc_items = sscanf(port_name_in, "%c%c%d", 125 &pf_c1, &pf_c2, &port_info_out->pf_num); 126 if (sc_items == 3 && pf_c1 == 'p' && pf_c2 == 'f') { 127 port_info_out->port_name = -1; 128 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_PFHPF; 129 return; 130 } 131 /* Check for port-name as a number (support kernel ver < 5.0 */ 132 errno = 0; 133 port_info_out->port_name = strtol(port_name_in, &end, 0); 134 if (!errno && 135 (size_t)(end - port_name_in) == strlen(port_name_in)) { 136 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_LEGACY; 137 return; 138 } 139 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UNKNOWN; 140 } 141 142 /** 143 * Get kernel interface name from IB device path. 144 * 145 * @param[in] ibdev_path 146 * Pointer to IB device path. 147 * @param[out] ifname 148 * Interface name output buffer. 149 * 150 * @return 151 * 0 on success, a negative errno value otherwise and rte_errno is set. 152 */ 153 int 154 mlx5_get_ifname_sysfs(const char *ibdev_path, char *ifname) 155 { 156 DIR *dir; 157 struct dirent *dent; 158 unsigned int dev_type = 0; 159 unsigned int dev_port_prev = ~0u; 160 char match[IF_NAMESIZE] = ""; 161 162 MLX5_ASSERT(ibdev_path); 163 { 164 MKSTR(path, "%s/device/net", ibdev_path); 165 166 dir = opendir(path); 167 if (dir == NULL) { 168 rte_errno = errno; 169 return -rte_errno; 170 } 171 } 172 while ((dent = readdir(dir)) != NULL) { 173 char *name = dent->d_name; 174 FILE *file; 175 unsigned int dev_port; 176 int r; 177 178 if ((name[0] == '.') && 179 ((name[1] == '\0') || 180 ((name[1] == '.') && (name[2] == '\0')))) 181 continue; 182 183 MKSTR(path, "%s/device/net/%s/%s", 184 ibdev_path, name, 185 (dev_type ? "dev_id" : "dev_port")); 186 187 file = fopen(path, "rb"); 188 if (file == NULL) { 189 if (errno != ENOENT) 190 continue; 191 /* 192 * Switch to dev_id when dev_port does not exist as 193 * is the case with Linux kernel versions < 3.15. 194 */ 195 try_dev_id: 196 match[0] = '\0'; 197 if (dev_type) 198 break; 199 dev_type = 1; 200 dev_port_prev = ~0u; 201 rewinddir(dir); 202 continue; 203 } 204 r = fscanf(file, (dev_type ? "%x" : "%u"), &dev_port); 205 fclose(file); 206 if (r != 1) 207 continue; 208 /* 209 * Switch to dev_id when dev_port returns the same value for 210 * all ports. May happen when using a MOFED release older than 211 * 3.0 with a Linux kernel >= 3.15. 212 */ 213 if (dev_port == dev_port_prev) 214 goto try_dev_id; 215 dev_port_prev = dev_port; 216 if (dev_port == 0) 217 strlcpy(match, name, IF_NAMESIZE); 218 } 219 closedir(dir); 220 if (match[0] == '\0') { 221 rte_errno = ENOENT; 222 return -rte_errno; 223 } 224 strncpy(ifname, match, IF_NAMESIZE); 225 return 0; 226 } 227 228 #ifdef MLX5_GLUE 229 230 /** 231 * Suffix RTE_EAL_PMD_PATH with "-glue". 232 * 233 * This function performs a sanity check on RTE_EAL_PMD_PATH before 234 * suffixing its last component. 235 * 236 * @param buf[out] 237 * Output buffer, should be large enough otherwise NULL is returned. 238 * @param size 239 * Size of @p out. 240 * 241 * @return 242 * Pointer to @p buf or @p NULL in case suffix cannot be appended. 243 */ 244 static char * 245 mlx5_glue_path(char *buf, size_t size) 246 { 247 static const char *const bad[] = { "/", ".", "..", NULL }; 248 const char *path = RTE_EAL_PMD_PATH; 249 size_t len = strlen(path); 250 size_t off; 251 int i; 252 253 while (len && path[len - 1] == '/') 254 --len; 255 for (off = len; off && path[off - 1] != '/'; --off) 256 ; 257 for (i = 0; bad[i]; ++i) 258 if (!strncmp(path + off, bad[i], (int)(len - off))) 259 goto error; 260 i = snprintf(buf, size, "%.*s-glue", (int)len, path); 261 if (i == -1 || (size_t)i >= size) 262 goto error; 263 return buf; 264 error: 265 RTE_LOG(ERR, PMD, "unable to append \"-glue\" to last component of" 266 " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"), please" 267 " re-configure DPDK"); 268 return NULL; 269 } 270 271 static int 272 mlx5_glue_dlopen(void) 273 { 274 char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")]; 275 void *handle = NULL; 276 277 char const *path[] = { 278 /* 279 * A basic security check is necessary before trusting 280 * MLX5_GLUE_PATH, which may override RTE_EAL_PMD_PATH. 281 */ 282 (geteuid() == getuid() && getegid() == getgid() ? 283 getenv("MLX5_GLUE_PATH") : NULL), 284 /* 285 * When RTE_EAL_PMD_PATH is set, use its glue-suffixed 286 * variant, otherwise let dlopen() look up libraries on its 287 * own. 288 */ 289 (*RTE_EAL_PMD_PATH ? 290 mlx5_glue_path(glue_path, sizeof(glue_path)) : ""), 291 }; 292 unsigned int i = 0; 293 void **sym; 294 const char *dlmsg; 295 296 while (!handle && i != RTE_DIM(path)) { 297 const char *end; 298 size_t len; 299 int ret; 300 301 if (!path[i]) { 302 ++i; 303 continue; 304 } 305 end = strpbrk(path[i], ":;"); 306 if (!end) 307 end = path[i] + strlen(path[i]); 308 len = end - path[i]; 309 ret = 0; 310 do { 311 char name[ret + 1]; 312 313 ret = snprintf(name, sizeof(name), "%.*s%s" MLX5_GLUE, 314 (int)len, path[i], 315 (!len || *(end - 1) == '/') ? "" : "/"); 316 if (ret == -1) 317 break; 318 if (sizeof(name) != (size_t)ret + 1) 319 continue; 320 DRV_LOG(DEBUG, "Looking for rdma-core glue as " 321 "\"%s\"", name); 322 handle = dlopen(name, RTLD_LAZY); 323 break; 324 } while (1); 325 path[i] = end + 1; 326 if (!*end) 327 ++i; 328 } 329 if (!handle) { 330 rte_errno = EINVAL; 331 dlmsg = dlerror(); 332 if (dlmsg) 333 DRV_LOG(WARNING, "Cannot load glue library: %s", dlmsg); 334 goto glue_error; 335 } 336 sym = dlsym(handle, "mlx5_glue"); 337 if (!sym || !*sym) { 338 rte_errno = EINVAL; 339 dlmsg = dlerror(); 340 if (dlmsg) 341 DRV_LOG(ERR, "Cannot resolve glue symbol: %s", dlmsg); 342 goto glue_error; 343 } 344 mlx5_glue = *sym; 345 return 0; 346 347 glue_error: 348 if (handle) 349 dlclose(handle); 350 return -1; 351 } 352 353 #endif 354 355 /** 356 * Initialization routine for run-time dependency on rdma-core. 357 */ 358 void 359 mlx5_glue_constructor(void) 360 { 361 /* 362 * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use 363 * huge pages. Calling ibv_fork_init() during init allows 364 * applications to use fork() safely for purposes other than 365 * using this PMD, which is not supported in forked processes. 366 */ 367 setenv("RDMAV_HUGEPAGES_SAFE", "1", 1); 368 /* Match the size of Rx completion entry to the size of a cacheline. */ 369 if (RTE_CACHE_LINE_SIZE == 128) 370 setenv("MLX5_CQE_SIZE", "128", 0); 371 /* 372 * MLX5_DEVICE_FATAL_CLEANUP tells ibv_destroy functions to 373 * cleanup all the Verbs resources even when the device was removed. 374 */ 375 setenv("MLX5_DEVICE_FATAL_CLEANUP", "1", 1); 376 377 #ifdef MLX5_GLUE 378 if (mlx5_glue_dlopen() != 0) 379 goto glue_error; 380 #endif 381 382 #ifdef RTE_LIBRTE_MLX5_DEBUG 383 /* Glue structure must not contain any NULL pointers. */ 384 { 385 unsigned int i; 386 387 for (i = 0; i != sizeof(*mlx5_glue) / sizeof(void *); ++i) 388 MLX5_ASSERT(((const void *const *)mlx5_glue)[i]); 389 } 390 #endif 391 if (strcmp(mlx5_glue->version, MLX5_GLUE_VERSION)) { 392 rte_errno = EINVAL; 393 DRV_LOG(ERR, "rdma-core glue \"%s\" mismatch: \"%s\" is " 394 "required", mlx5_glue->version, MLX5_GLUE_VERSION); 395 goto glue_error; 396 } 397 mlx5_glue->fork_init(); 398 return; 399 400 glue_error: 401 DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing" 402 " run-time dependency on rdma-core libraries (libibverbs," 403 " libmlx5)"); 404 mlx5_glue = NULL; 405 } 406 407