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 break; 70 } 71 } 72 fclose(file); 73 return 0; 74 } 75 76 /** 77 * Extract port name, as a number, from sysfs or netlink information. 78 * 79 * @param[in] port_name_in 80 * String representing the port name. 81 * @param[out] port_info_out 82 * Port information, including port name as a number and port name 83 * type if recognized 84 * 85 * @return 86 * port_name field set according to recognized name format. 87 */ 88 void 89 mlx5_translate_port_name(const char *port_name_in, 90 struct mlx5_switch_info *port_info_out) 91 { 92 char pf_c1, pf_c2, vf_c1, vf_c2, eol; 93 char *end; 94 int sc_items; 95 96 /* 97 * Check for port-name as a string of the form pf0vf0 98 * (support kernel ver >= 5.0 or OFED ver >= 4.6). 99 */ 100 sc_items = sscanf(port_name_in, "%c%c%d%c%c%d%c", 101 &pf_c1, &pf_c2, &port_info_out->pf_num, 102 &vf_c1, &vf_c2, &port_info_out->port_name, &eol); 103 if (sc_items == 6 && 104 pf_c1 == 'p' && pf_c2 == 'f' && 105 vf_c1 == 'v' && vf_c2 == 'f') { 106 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_PFVF; 107 return; 108 } 109 /* 110 * Check for port-name as a string of the form p0 111 * (support kernel ver >= 5.0, or OFED ver >= 4.6). 112 */ 113 sc_items = sscanf(port_name_in, "%c%d%c", 114 &pf_c1, &port_info_out->port_name, &eol); 115 if (sc_items == 2 && pf_c1 == 'p') { 116 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UPLINK; 117 return; 118 } 119 /* 120 * Check for port-name as a string of the form pf0 121 * (support kernel ver >= 5.7 for HPF representor on BF). 122 */ 123 sc_items = sscanf(port_name_in, "%c%c%d%c", 124 &pf_c1, &pf_c2, &port_info_out->pf_num, &eol); 125 if (sc_items == 3 && pf_c1 == 'p' && pf_c2 == 'f') { 126 port_info_out->port_name = -1; 127 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_PFHPF; 128 return; 129 } 130 /* Check for port-name as a number (support kernel ver < 5.0 */ 131 errno = 0; 132 port_info_out->port_name = strtol(port_name_in, &end, 0); 133 if (!errno && 134 (size_t)(end - port_name_in) == strlen(port_name_in)) { 135 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_LEGACY; 136 return; 137 } 138 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UNKNOWN; 139 } 140 141 /** 142 * Get kernel interface name from IB device path. 143 * 144 * @param[in] ibdev_path 145 * Pointer to IB device path. 146 * @param[out] ifname 147 * Interface name output buffer. 148 * 149 * @return 150 * 0 on success, a negative errno value otherwise and rte_errno is set. 151 */ 152 int 153 mlx5_get_ifname_sysfs(const char *ibdev_path, char *ifname) 154 { 155 DIR *dir; 156 struct dirent *dent; 157 unsigned int dev_type = 0; 158 unsigned int dev_port_prev = ~0u; 159 char match[IF_NAMESIZE] = ""; 160 161 MLX5_ASSERT(ibdev_path); 162 { 163 MKSTR(path, "%s/device/net", ibdev_path); 164 165 dir = opendir(path); 166 if (dir == NULL) { 167 rte_errno = errno; 168 return -rte_errno; 169 } 170 } 171 while ((dent = readdir(dir)) != NULL) { 172 char *name = dent->d_name; 173 FILE *file; 174 unsigned int dev_port; 175 int r; 176 177 if ((name[0] == '.') && 178 ((name[1] == '\0') || 179 ((name[1] == '.') && (name[2] == '\0')))) 180 continue; 181 182 MKSTR(path, "%s/device/net/%s/%s", 183 ibdev_path, name, 184 (dev_type ? "dev_id" : "dev_port")); 185 186 file = fopen(path, "rb"); 187 if (file == NULL) { 188 if (errno != ENOENT) 189 continue; 190 /* 191 * Switch to dev_id when dev_port does not exist as 192 * is the case with Linux kernel versions < 3.15. 193 */ 194 try_dev_id: 195 match[0] = '\0'; 196 if (dev_type) 197 break; 198 dev_type = 1; 199 dev_port_prev = ~0u; 200 rewinddir(dir); 201 continue; 202 } 203 r = fscanf(file, (dev_type ? "%x" : "%u"), &dev_port); 204 fclose(file); 205 if (r != 1) 206 continue; 207 /* 208 * Switch to dev_id when dev_port returns the same value for 209 * all ports. May happen when using a MOFED release older than 210 * 3.0 with a Linux kernel >= 3.15. 211 */ 212 if (dev_port == dev_port_prev) 213 goto try_dev_id; 214 dev_port_prev = dev_port; 215 if (dev_port == 0) 216 strlcpy(match, name, IF_NAMESIZE); 217 } 218 closedir(dir); 219 if (match[0] == '\0') { 220 rte_errno = ENOENT; 221 return -rte_errno; 222 } 223 strncpy(ifname, match, IF_NAMESIZE); 224 return 0; 225 } 226 227 #ifdef MLX5_GLUE 228 229 /** 230 * Suffix RTE_EAL_PMD_PATH with "-glue". 231 * 232 * This function performs a sanity check on RTE_EAL_PMD_PATH before 233 * suffixing its last component. 234 * 235 * @param buf[out] 236 * Output buffer, should be large enough otherwise NULL is returned. 237 * @param size 238 * Size of @p out. 239 * 240 * @return 241 * Pointer to @p buf or @p NULL in case suffix cannot be appended. 242 */ 243 static char * 244 mlx5_glue_path(char *buf, size_t size) 245 { 246 static const char *const bad[] = { "/", ".", "..", NULL }; 247 const char *path = RTE_EAL_PMD_PATH; 248 size_t len = strlen(path); 249 size_t off; 250 int i; 251 252 while (len && path[len - 1] == '/') 253 --len; 254 for (off = len; off && path[off - 1] != '/'; --off) 255 ; 256 for (i = 0; bad[i]; ++i) 257 if (!strncmp(path + off, bad[i], (int)(len - off))) 258 goto error; 259 i = snprintf(buf, size, "%.*s-glue", (int)len, path); 260 if (i == -1 || (size_t)i >= size) 261 goto error; 262 return buf; 263 error: 264 RTE_LOG(ERR, PMD, "unable to append \"-glue\" to last component of" 265 " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"), please" 266 " re-configure DPDK"); 267 return NULL; 268 } 269 270 static int 271 mlx5_glue_dlopen(void) 272 { 273 char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")]; 274 void *handle = NULL; 275 276 char const *path[] = { 277 /* 278 * A basic security check is necessary before trusting 279 * MLX5_GLUE_PATH, which may override RTE_EAL_PMD_PATH. 280 */ 281 (geteuid() == getuid() && getegid() == getgid() ? 282 getenv("MLX5_GLUE_PATH") : NULL), 283 /* 284 * When RTE_EAL_PMD_PATH is set, use its glue-suffixed 285 * variant, otherwise let dlopen() look up libraries on its 286 * own. 287 */ 288 (*RTE_EAL_PMD_PATH ? 289 mlx5_glue_path(glue_path, sizeof(glue_path)) : ""), 290 }; 291 unsigned int i = 0; 292 void **sym; 293 const char *dlmsg; 294 295 while (!handle && i != RTE_DIM(path)) { 296 const char *end; 297 size_t len; 298 int ret; 299 300 if (!path[i]) { 301 ++i; 302 continue; 303 } 304 end = strpbrk(path[i], ":;"); 305 if (!end) 306 end = path[i] + strlen(path[i]); 307 len = end - path[i]; 308 ret = 0; 309 do { 310 char name[ret + 1]; 311 312 ret = snprintf(name, sizeof(name), "%.*s%s" MLX5_GLUE, 313 (int)len, path[i], 314 (!len || *(end - 1) == '/') ? "" : "/"); 315 if (ret == -1) 316 break; 317 if (sizeof(name) != (size_t)ret + 1) 318 continue; 319 DRV_LOG(DEBUG, "Looking for rdma-core glue as " 320 "\"%s\"", name); 321 handle = dlopen(name, RTLD_LAZY); 322 break; 323 } while (1); 324 path[i] = end + 1; 325 if (!*end) 326 ++i; 327 } 328 if (!handle) { 329 rte_errno = EINVAL; 330 dlmsg = dlerror(); 331 if (dlmsg) 332 DRV_LOG(WARNING, "Cannot load glue library: %s", dlmsg); 333 goto glue_error; 334 } 335 sym = dlsym(handle, "mlx5_glue"); 336 if (!sym || !*sym) { 337 rte_errno = EINVAL; 338 dlmsg = dlerror(); 339 if (dlmsg) 340 DRV_LOG(ERR, "Cannot resolve glue symbol: %s", dlmsg); 341 goto glue_error; 342 } 343 mlx5_glue = *sym; 344 return 0; 345 346 glue_error: 347 if (handle) 348 dlclose(handle); 349 return -1; 350 } 351 352 #endif 353 354 /** 355 * Initialization routine for run-time dependency on rdma-core. 356 */ 357 void 358 mlx5_glue_constructor(void) 359 { 360 /* 361 * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use 362 * huge pages. Calling ibv_fork_init() during init allows 363 * applications to use fork() safely for purposes other than 364 * using this PMD, which is not supported in forked processes. 365 */ 366 setenv("RDMAV_HUGEPAGES_SAFE", "1", 1); 367 /* Match the size of Rx completion entry to the size of a cacheline. */ 368 if (RTE_CACHE_LINE_SIZE == 128) 369 setenv("MLX5_CQE_SIZE", "128", 0); 370 /* 371 * MLX5_DEVICE_FATAL_CLEANUP tells ibv_destroy functions to 372 * cleanup all the Verbs resources even when the device was removed. 373 */ 374 setenv("MLX5_DEVICE_FATAL_CLEANUP", "1", 1); 375 376 #ifdef MLX5_GLUE 377 if (mlx5_glue_dlopen() != 0) 378 goto glue_error; 379 #endif 380 381 #ifdef RTE_LIBRTE_MLX5_DEBUG 382 /* Glue structure must not contain any NULL pointers. */ 383 { 384 unsigned int i; 385 386 for (i = 0; i != sizeof(*mlx5_glue) / sizeof(void *); ++i) 387 MLX5_ASSERT(((const void *const *)mlx5_glue)[i]); 388 } 389 #endif 390 if (strcmp(mlx5_glue->version, MLX5_GLUE_VERSION)) { 391 rte_errno = EINVAL; 392 DRV_LOG(ERR, "rdma-core glue \"%s\" mismatch: \"%s\" is " 393 "required", mlx5_glue->version, MLX5_GLUE_VERSION); 394 goto glue_error; 395 } 396 mlx5_glue->fork_init(); 397 return; 398 399 glue_error: 400 DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing" 401 " run-time dependency on rdma-core libraries (libibverbs," 402 " libmlx5)"); 403 mlx5_glue = NULL; 404 } 405 406