4 * Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
5 * Copyright(c) 2012-2014 6WIND S.A.
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15 * notice, this list of conditions and the following disclaimer in
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32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
50 #include <sys/queue.h>
52 #if defined(RTE_ARCH_X86)
56 #include <rte_common.h>
57 #include <rte_debug.h>
58 #include <rte_memory.h>
59 #include <rte_memzone.h>
60 #include <rte_launch.h>
62 #include <rte_eal_memconfig.h>
63 #include <rte_errno.h>
64 #include <rte_per_lcore.h>
65 #include <rte_lcore.h>
66 #include <rte_service_component.h>
68 #include <rte_random.h>
69 #include <rte_cycles.h>
70 #include <rte_string_fns.h>
71 #include <rte_cpuflags.h>
72 #include <rte_interrupts.h>
76 #include <rte_devargs.h>
77 #include <rte_version.h>
78 #include <rte_atomic.h>
79 #include <malloc_heap.h>
81 #include "eal_private.h"
82 #include "eal_thread.h"
83 #include "eal_internal_cfg.h"
84 #include "eal_filesystem.h"
85 #include "eal_hugepages.h"
86 #include "eal_options.h"
89 #define MEMSIZE_IF_NO_HUGE_PAGE (64ULL * 1024ULL * 1024ULL)
91 #define SOCKET_MEM_STRLEN (RTE_MAX_NUMA_NODES * 10)
93 /* Allow the application to print its usage message too if set */
94 static rte_usage_hook_t rte_application_usage_hook = NULL;
96 /* early configuration structure, when memory config is not mmapped */
97 static struct rte_mem_config early_mem_config;
99 /* define fd variable here, because file needs to be kept open for the
100 * duration of the program, as we hold a write lock on it in the primary proc */
101 static int mem_cfg_fd = -1;
103 static struct flock wr_lock = {
105 .l_whence = SEEK_SET,
106 .l_start = offsetof(struct rte_mem_config, memseg),
107 .l_len = sizeof(early_mem_config.memseg),
110 /* Address of global and public configuration */
111 static struct rte_config rte_config = {
112 .mem_config = &early_mem_config,
115 /* internal configuration (per-core) */
116 struct lcore_config lcore_config[RTE_MAX_LCORE];
118 /* internal configuration */
119 struct internal_config internal_config;
121 /* used by rte_rdtsc() */
122 int rte_cycles_vmware_tsc_map;
124 /* Return a pointer to the configuration structure */
126 rte_eal_get_configuration(void)
131 /* parse a sysfs (or other) file containing one integer value */
133 eal_parse_sysfs_value(const char *filename, unsigned long *val)
139 if ((f = fopen(filename, "r")) == NULL) {
140 RTE_LOG(ERR, EAL, "%s(): cannot open sysfs value %s\n",
145 if (fgets(buf, sizeof(buf), f) == NULL) {
146 RTE_LOG(ERR, EAL, "%s(): cannot read sysfs value %s\n",
151 *val = strtoul(buf, &end, 0);
152 if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
153 RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs value %s\n",
163 /* create memory configuration in shared/mmap memory. Take out
164 * a write lock on the memsegs, so we can auto-detect primary/secondary.
165 * This means we never close the file while running (auto-close on exit).
166 * We also don't lock the whole file, so that in future we can use read-locks
167 * on other parts, e.g. memzones, to detect if there are running secondary
170 rte_eal_config_create(void)
172 void *rte_mem_cfg_addr;
175 const char *pathname = eal_runtime_config_path();
177 if (internal_config.no_shconf)
180 /* map the config before hugepage address so that we don't waste a page */
181 if (internal_config.base_virtaddr != 0)
182 rte_mem_cfg_addr = (void *)
183 RTE_ALIGN_FLOOR(internal_config.base_virtaddr -
184 sizeof(struct rte_mem_config), sysconf(_SC_PAGE_SIZE));
186 rte_mem_cfg_addr = NULL;
189 mem_cfg_fd = open(pathname, O_RDWR | O_CREAT, 0660);
191 rte_panic("Cannot open '%s' for rte_mem_config\n", pathname);
194 retval = ftruncate(mem_cfg_fd, sizeof(*rte_config.mem_config));
197 rte_panic("Cannot resize '%s' for rte_mem_config\n", pathname);
200 retval = fcntl(mem_cfg_fd, F_SETLK, &wr_lock);
203 rte_exit(EXIT_FAILURE, "Cannot create lock on '%s'. Is another primary "
204 "process running?\n", pathname);
207 rte_mem_cfg_addr = mmap(rte_mem_cfg_addr, sizeof(*rte_config.mem_config),
208 PROT_READ | PROT_WRITE, MAP_SHARED, mem_cfg_fd, 0);
210 if (rte_mem_cfg_addr == MAP_FAILED){
211 rte_panic("Cannot mmap memory for rte_config\n");
213 memcpy(rte_mem_cfg_addr, &early_mem_config, sizeof(early_mem_config));
214 rte_config.mem_config = rte_mem_cfg_addr;
216 /* store address of the config in the config itself so that secondary
217 * processes could later map the config into this exact location */
218 rte_config.mem_config->mem_cfg_addr = (uintptr_t) rte_mem_cfg_addr;
222 /* attach to an existing shared memory config */
224 rte_eal_config_attach(void)
226 struct rte_mem_config *mem_config;
228 const char *pathname = eal_runtime_config_path();
230 if (internal_config.no_shconf)
234 mem_cfg_fd = open(pathname, O_RDWR);
236 rte_panic("Cannot open '%s' for rte_mem_config\n", pathname);
239 /* map it as read-only first */
240 mem_config = (struct rte_mem_config *) mmap(NULL, sizeof(*mem_config),
241 PROT_READ, MAP_SHARED, mem_cfg_fd, 0);
242 if (mem_config == MAP_FAILED)
243 rte_panic("Cannot mmap memory for rte_config! error %i (%s)\n",
244 errno, strerror(errno));
246 rte_config.mem_config = mem_config;
249 /* reattach the shared config at exact memory location primary process has it */
251 rte_eal_config_reattach(void)
253 struct rte_mem_config *mem_config;
254 void *rte_mem_cfg_addr;
256 if (internal_config.no_shconf)
259 /* save the address primary process has mapped shared config to */
260 rte_mem_cfg_addr = (void *) (uintptr_t) rte_config.mem_config->mem_cfg_addr;
262 /* unmap original config */
263 munmap(rte_config.mem_config, sizeof(struct rte_mem_config));
265 /* remap the config at proper address */
266 mem_config = (struct rte_mem_config *) mmap(rte_mem_cfg_addr,
267 sizeof(*mem_config), PROT_READ | PROT_WRITE, MAP_SHARED,
269 if (mem_config == MAP_FAILED || mem_config != rte_mem_cfg_addr) {
270 if (mem_config != MAP_FAILED)
271 /* errno is stale, don't use */
272 rte_panic("Cannot mmap memory for rte_config at [%p], got [%p]"
273 " - please use '--base-virtaddr' option\n",
274 rte_mem_cfg_addr, mem_config);
276 rte_panic("Cannot mmap memory for rte_config! error %i (%s)\n",
277 errno, strerror(errno));
281 rte_config.mem_config = mem_config;
284 /* Detect if we are a primary or a secondary process */
286 eal_proc_type_detect(void)
288 enum rte_proc_type_t ptype = RTE_PROC_PRIMARY;
289 const char *pathname = eal_runtime_config_path();
291 /* if we can open the file but not get a write-lock we are a secondary
292 * process. NOTE: if we get a file handle back, we keep that open
293 * and don't close it to prevent a race condition between multiple opens */
294 if (((mem_cfg_fd = open(pathname, O_RDWR)) >= 0) &&
295 (fcntl(mem_cfg_fd, F_SETLK, &wr_lock) < 0))
296 ptype = RTE_PROC_SECONDARY;
298 RTE_LOG(INFO, EAL, "Auto-detected process type: %s\n",
299 ptype == RTE_PROC_PRIMARY ? "PRIMARY" : "SECONDARY");
304 /* Sets up rte_config structure with the pointer to shared memory config.*/
306 rte_config_init(void)
308 rte_config.process_type = internal_config.process_type;
310 switch (rte_config.process_type){
311 case RTE_PROC_PRIMARY:
312 rte_eal_config_create();
314 case RTE_PROC_SECONDARY:
315 rte_eal_config_attach();
316 rte_eal_mcfg_wait_complete(rte_config.mem_config);
317 rte_eal_config_reattach();
320 case RTE_PROC_INVALID:
321 rte_panic("Invalid process type\n");
325 /* Unlocks hugepage directories that were locked by eal_hugepage_info_init */
327 eal_hugedirs_unlock(void)
331 for (i = 0; i < MAX_HUGEPAGE_SIZES; i++)
333 /* skip uninitialized */
334 if (internal_config.hugepage_info[i].lock_descriptor < 0)
336 /* unlock hugepage file */
337 flock(internal_config.hugepage_info[i].lock_descriptor, LOCK_UN);
338 close(internal_config.hugepage_info[i].lock_descriptor);
339 /* reset the field */
340 internal_config.hugepage_info[i].lock_descriptor = -1;
346 eal_usage(const char *prgname)
348 printf("\nUsage: %s ", prgname);
350 printf("EAL Linux options:\n"
351 " --"OPT_SOCKET_MEM" Memory to allocate on sockets (comma separated values)\n"
352 " --"OPT_HUGE_DIR" Directory where hugetlbfs is mounted\n"
353 " --"OPT_FILE_PREFIX" Prefix for hugepage filenames\n"
354 " --"OPT_BASE_VIRTADDR" Base virtual address\n"
355 " --"OPT_CREATE_UIO_DEV" Create /dev/uioX (usually done by hotplug)\n"
356 " --"OPT_VFIO_INTR" Interrupt mode for VFIO (legacy|msi|msix)\n"
357 " --"OPT_XEN_DOM0" Support running on Xen dom0 without hugetlbfs\n"
359 /* Allow the application to print its usage message too if hook is set */
360 if ( rte_application_usage_hook ) {
361 printf("===== Application Usage =====\n\n");
362 rte_application_usage_hook(prgname);
366 /* Set a per-application usage message */
368 rte_set_application_usage_hook( rte_usage_hook_t usage_func )
370 rte_usage_hook_t old_func;
372 /* Will be NULL on the first call to denote the last usage routine. */
373 old_func = rte_application_usage_hook;
374 rte_application_usage_hook = usage_func;
380 eal_parse_socket_mem(char *socket_mem)
382 char * arg[RTE_MAX_NUMA_NODES];
385 uint64_t total_mem = 0;
387 len = strnlen(socket_mem, SOCKET_MEM_STRLEN);
388 if (len == SOCKET_MEM_STRLEN) {
389 RTE_LOG(ERR, EAL, "--socket-mem is too long\n");
393 /* all other error cases will be caught later */
394 if (!isdigit(socket_mem[len-1]))
397 /* split the optarg into separate socket values */
398 arg_num = rte_strsplit(socket_mem, len,
399 arg, RTE_MAX_NUMA_NODES, ',');
401 /* if split failed, or 0 arguments */
405 internal_config.force_sockets = 1;
407 /* parse each defined socket option */
409 for (i = 0; i < arg_num; i++) {
411 internal_config.socket_mem[i] = strtoull(arg[i], &end, 10);
413 /* check for invalid input */
415 (arg[i][0] == '\0') || (end == NULL) || (*end != '\0'))
417 internal_config.socket_mem[i] *= 1024ULL;
418 internal_config.socket_mem[i] *= 1024ULL;
419 total_mem += internal_config.socket_mem[i];
422 /* check if we have a positive amount of total memory */
430 eal_parse_base_virtaddr(const char *arg)
436 addr = strtoull(arg, &end, 16);
438 /* check for errors */
439 if ((errno != 0) || (arg[0] == '\0') || end == NULL || (*end != '\0'))
442 /* make sure we don't exceed 32-bit boundary on 32-bit target */
444 if (addr >= UINTPTR_MAX)
448 /* align the addr on 16M boundary, 16MB is the minimum huge page
449 * size on IBM Power architecture. If the addr is aligned to 16MB,
450 * it can align to 2MB for x86. So this alignment can also be used
452 internal_config.base_virtaddr =
453 RTE_PTR_ALIGN_CEIL((uintptr_t)addr, (size_t)RTE_PGSIZE_16M);
459 eal_parse_vfio_intr(const char *mode)
464 enum rte_intr_mode value;
466 { "legacy", RTE_INTR_MODE_LEGACY },
467 { "msi", RTE_INTR_MODE_MSI },
468 { "msix", RTE_INTR_MODE_MSIX },
471 for (i = 0; i < RTE_DIM(map); i++) {
472 if (!strcmp(mode, map[i].name)) {
473 internal_config.vfio_intr_mode = map[i].value;
480 /* Parse the arguments for --log-level only */
482 eal_log_level_parse(int argc, char **argv)
487 const int old_optind = optind;
488 const int old_optopt = optopt;
489 char * const old_optarg = optarg;
494 while ((opt = getopt_long(argc, argvopt, eal_short_options,
495 eal_long_options, &option_index)) != EOF) {
499 /* getopt is not happy, stop right now */
503 ret = (opt == OPT_LOG_LEVEL_NUM) ?
504 eal_parse_common_option(opt, optarg, &internal_config) : 0;
506 /* common parser is not happy */
511 /* restore getopt lib */
517 /* Parse the argument given in the command line of the application */
519 eal_parse_args(int argc, char **argv)
524 char *prgname = argv[0];
525 const int old_optind = optind;
526 const int old_optopt = optopt;
527 char * const old_optarg = optarg;
532 while ((opt = getopt_long(argc, argvopt, eal_short_options,
533 eal_long_options, &option_index)) != EOF) {
535 /* getopt is not happy, stop right now */
542 ret = eal_parse_common_option(opt, optarg, &internal_config);
543 /* common parser is not happy */
549 /* common parser handled this option */
559 case OPT_XEN_DOM0_NUM:
560 #ifdef RTE_LIBRTE_XEN_DOM0
561 internal_config.xen_dom0_support = 1;
563 RTE_LOG(ERR, EAL, "Can't support DPDK app "
564 "running on Dom0, please configure"
565 " RTE_LIBRTE_XEN_DOM0=y\n");
571 case OPT_HUGE_DIR_NUM:
572 internal_config.hugepage_dir = optarg;
575 case OPT_FILE_PREFIX_NUM:
576 internal_config.hugefile_prefix = optarg;
579 case OPT_SOCKET_MEM_NUM:
580 if (eal_parse_socket_mem(optarg) < 0) {
581 RTE_LOG(ERR, EAL, "invalid parameters for --"
582 OPT_SOCKET_MEM "\n");
589 case OPT_BASE_VIRTADDR_NUM:
590 if (eal_parse_base_virtaddr(optarg) < 0) {
591 RTE_LOG(ERR, EAL, "invalid parameter for --"
592 OPT_BASE_VIRTADDR "\n");
599 case OPT_VFIO_INTR_NUM:
600 if (eal_parse_vfio_intr(optarg) < 0) {
601 RTE_LOG(ERR, EAL, "invalid parameters for --"
609 case OPT_CREATE_UIO_DEV_NUM:
610 internal_config.create_uio_dev = 1;
614 if (opt < OPT_LONG_MIN_NUM && isprint(opt)) {
615 RTE_LOG(ERR, EAL, "Option %c is not supported "
617 } else if (opt >= OPT_LONG_MIN_NUM &&
618 opt < OPT_LONG_MAX_NUM) {
619 RTE_LOG(ERR, EAL, "Option %s is not supported "
621 eal_long_options[option_index].name);
623 RTE_LOG(ERR, EAL, "Option %d is not supported "
632 if (eal_adjust_config(&internal_config) != 0) {
638 if (eal_check_common_options(&internal_config) != 0) {
644 /* --xen-dom0 doesn't make sense with --socket-mem */
645 if (internal_config.xen_dom0_support && internal_config.force_sockets == 1) {
646 RTE_LOG(ERR, EAL, "Options --"OPT_SOCKET_MEM" cannot be specified "
647 "together with --"OPT_XEN_DOM0"\n");
654 argv[optind-1] = prgname;
658 /* restore getopt lib */
667 eal_check_mem_on_local_socket(void)
669 const struct rte_memseg *ms;
672 socket_id = rte_lcore_to_socket_id(rte_config.master_lcore);
674 ms = rte_eal_get_physmem_layout();
676 for (i = 0; i < RTE_MAX_MEMSEG; i++)
677 if (ms[i].socket_id == socket_id &&
681 RTE_LOG(WARNING, EAL, "WARNING: Master core has no "
682 "memory on local socket!\n");
686 sync_func(__attribute__((unused)) void *arg)
692 rte_eal_mcfg_complete(void)
694 /* ALL shared mem_config related INIT DONE */
695 if (rte_config.process_type == RTE_PROC_PRIMARY)
696 rte_config.mem_config->magic = RTE_MAGIC;
700 * Request iopl privilege for all RPL, returns 0 on success
701 * iopl() call is mostly for the i386 architecture. For other architectures,
702 * return -1 to indicate IO privilege can't be changed in this way.
705 rte_eal_iopl_init(void)
707 #if defined(RTE_ARCH_X86)
715 static int rte_eal_vfio_setup(void)
717 int vfio_enabled = 0;
719 if (!internal_config.no_pci) {
721 vfio_enabled |= pci_vfio_is_enabled();
726 /* if we are primary process, create a thread to communicate with
727 * secondary processes. the thread will use a socket to wait for
728 * requests from secondary process to send open file descriptors,
729 * because VFIO does not allow multiple open descriptors on a group or
732 if (internal_config.process_type == RTE_PROC_PRIMARY &&
733 vfio_mp_sync_setup() < 0)
741 static void rte_eal_init_alert(const char *msg)
743 fprintf(stderr, "EAL: FATAL: %s\n", msg);
744 RTE_LOG(ERR, EAL, "%s\n", msg);
747 /* Launch threads, called at application init(). */
749 rte_eal_init(int argc, char **argv)
753 static rte_atomic32_t run_once = RTE_ATOMIC32_INIT(0);
755 char cpuset[RTE_CPU_AFFINITY_STR_LEN];
756 char thread_name[RTE_MAX_THREAD_NAME_LEN];
758 /* checks if the machine is adequate */
759 if (!rte_cpu_is_supported()) {
760 rte_eal_init_alert("unsupported cpu type.");
765 if (!rte_atomic32_test_and_set(&run_once)) {
766 rte_eal_init_alert("already called initialization.");
767 rte_errno = EALREADY;
771 logid = strrchr(argv[0], '/');
772 logid = strdup(logid ? logid + 1: argv[0]);
774 thread_id = pthread_self();
776 eal_reset_internal_config(&internal_config);
778 /* set log level as early as possible */
779 eal_log_level_parse(argc, argv);
781 if (rte_eal_cpu_init() < 0) {
782 rte_eal_init_alert("Cannot detect lcores.");
787 fctret = eal_parse_args(argc, argv);
789 rte_eal_init_alert("Invalid 'command line' arguments.");
791 rte_atomic32_clear(&run_once);
795 if (internal_config.no_hugetlbfs == 0 &&
796 internal_config.process_type != RTE_PROC_SECONDARY &&
797 internal_config.xen_dom0_support == 0 &&
798 eal_hugepage_info_init() < 0) {
799 rte_eal_init_alert("Cannot get hugepage information.");
801 rte_atomic32_clear(&run_once);
805 if (internal_config.memory == 0 && internal_config.force_sockets == 0) {
806 if (internal_config.no_hugetlbfs)
807 internal_config.memory = MEMSIZE_IF_NO_HUGE_PAGE;
810 if (internal_config.vmware_tsc_map == 1) {
811 #ifdef RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT
812 rte_cycles_vmware_tsc_map = 1;
813 RTE_LOG (DEBUG, EAL, "Using VMWARE TSC MAP, "
814 "you must have monitor_control.pseudo_perfctr = TRUE\n");
816 RTE_LOG (WARNING, EAL, "Ignoring --vmware-tsc-map because "
817 "RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT is not set\n");
821 rte_srand(rte_rdtsc());
825 if (rte_eal_log_init(logid, internal_config.syslog_facility) < 0) {
826 rte_eal_init_alert("Cannot init logging.");
828 rte_atomic32_clear(&run_once);
833 if (rte_eal_vfio_setup() < 0) {
834 rte_eal_init_alert("Cannot init VFIO\n");
836 rte_atomic32_clear(&run_once);
841 if (rte_eal_memory_init() < 0) {
842 rte_eal_init_alert("Cannot init memory\n");
847 /* the directories are locked during eal_hugepage_info_init */
848 eal_hugedirs_unlock();
850 if (rte_eal_memzone_init() < 0) {
851 rte_eal_init_alert("Cannot init memzone\n");
856 if (rte_eal_tailqs_init() < 0) {
857 rte_eal_init_alert("Cannot init tail queues for objects\n");
862 if (rte_eal_alarm_init() < 0) {
863 rte_eal_init_alert("Cannot init interrupt-handling thread\n");
864 /* rte_eal_alarm_init sets rte_errno on failure. */
868 if (rte_eal_timer_init() < 0) {
869 rte_eal_init_alert("Cannot init HPET or TSC timers\n");
874 eal_check_mem_on_local_socket();
876 if (eal_plugins_init() < 0)
877 rte_eal_init_alert("Cannot init plugins\n");
879 eal_thread_init_master(rte_config.master_lcore);
881 ret = eal_thread_dump_affinity(cpuset, RTE_CPU_AFFINITY_STR_LEN);
883 RTE_LOG(DEBUG, EAL, "Master lcore %u is ready (tid=%x;cpuset=[%s%s])\n",
884 rte_config.master_lcore, (int)thread_id, cpuset,
885 ret == 0 ? "" : "...");
887 if (rte_eal_intr_init() < 0) {
888 rte_eal_init_alert("Cannot init interrupt-handling thread\n");
892 if (eal_option_device_parse()) {
897 if (rte_bus_scan()) {
898 rte_eal_init_alert("Cannot scan the buses for devices\n");
903 RTE_LCORE_FOREACH_SLAVE(i) {
906 * create communication pipes between master thread
909 if (pipe(lcore_config[i].pipe_master2slave) < 0)
910 rte_panic("Cannot create pipe\n");
911 if (pipe(lcore_config[i].pipe_slave2master) < 0)
912 rte_panic("Cannot create pipe\n");
914 lcore_config[i].state = WAIT;
916 /* create a thread for each lcore */
917 ret = pthread_create(&lcore_config[i].thread_id, NULL,
918 eal_thread_loop, NULL);
920 rte_panic("Cannot create thread\n");
922 /* Set thread_name for aid in debugging. */
923 snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN,
924 "lcore-slave-%d", i);
925 ret = rte_thread_setname(lcore_config[i].thread_id,
929 "Cannot set name for lcore thread\n");
933 * Launch a dummy function on all slave lcores, so that master lcore
934 * knows they are all ready when this function returns.
936 rte_eal_mp_remote_launch(sync_func, NULL, SKIP_MASTER);
937 rte_eal_mp_wait_lcore();
939 /* initialize services so vdevs register service during bus_probe. */
940 ret = rte_service_init();
942 rte_eal_init_alert("rte_service_init() failed\n");
947 /* Probe all the buses and devices/drivers on them */
948 if (rte_bus_probe()) {
949 rte_eal_init_alert("Cannot probe devices\n");
954 /* initialize default service/lcore mappings and start running. Ignore
955 * -ENOTSUP, as it indicates no service coremask passed to EAL.
957 ret = rte_service_start_with_defaults();
958 if (ret < 0 && ret != -ENOTSUP) {
963 rte_eal_mcfg_complete();
969 enum rte_lcore_role_t
970 rte_eal_lcore_role(unsigned lcore_id)
972 return rte_config.lcore_role[lcore_id];
976 rte_eal_process_type(void)
978 return rte_config.process_type;
981 int rte_eal_has_hugepages(void)
983 return ! internal_config.no_hugetlbfs;
987 rte_eal_check_module(const char *module_name)
989 char sysfs_mod_name[PATH_MAX];
993 if (NULL == module_name)
996 /* Check if there is sysfs mounted */
997 if (stat("/sys/module", &st) != 0) {
998 RTE_LOG(DEBUG, EAL, "sysfs is not mounted! error %i (%s)\n",
999 errno, strerror(errno));
1003 /* A module might be built-in, therefore try sysfs */
1004 n = snprintf(sysfs_mod_name, PATH_MAX, "/sys/module/%s", module_name);
1005 if (n < 0 || n > PATH_MAX) {
1006 RTE_LOG(DEBUG, EAL, "Could not format module path\n");
1010 if (stat(sysfs_mod_name, &st) != 0) {
1011 RTE_LOG(DEBUG, EAL, "Module %s not found! error %i (%s)\n",
1012 sysfs_mod_name, errno, strerror(errno));
1016 /* Module has been found */