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31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 #include <sys/types.h>
49 #include <sys/queue.h>
51 #include <sys/ioctl.h>
53 #include <rte_interrupts.h>
56 #include <rte_common.h>
57 #include <rte_launch.h>
58 #include <rte_memory.h>
59 #include <rte_memzone.h>
60 #include <rte_tailq.h>
62 #include <rte_eal_memconfig.h>
63 #include <rte_per_lcore.h>
64 #include <rte_lcore.h>
65 #include <rte_malloc.h>
66 #include <rte_string_fns.h>
67 #include <rte_debug.h>
69 #include "eal_filesystem.h"
70 #include "eal_private.h"
74 * PCI probing under linux
76 * This code is used to simulate a PCI probe by parsing information in
77 * sysfs. Moreover, when a registered driver matches a device, the
78 * kernel driver currently using it is unloaded and replaced by
79 * igb_uio module, which is a very minimal userland driver for Intel
80 * network card, only providing access to PCI BAR to applications, and
81 * enabling bus master.
92 * For multi-process we need to reproduce all PCI mappings in secondary
93 * processes, so save them in a tailq.
96 TAILQ_ENTRY(uio_resource) next;
98 struct rte_pci_addr pci_addr;
101 struct uio_map maps[PCI_MAX_RESOURCE];
104 TAILQ_HEAD(uio_res_list, uio_resource);
106 static struct uio_res_list *uio_res_list = NULL;
107 static int pci_parse_sysfs_value(const char *filename, uint64_t *val);
109 /* forward prototype of function called in pci_switch_module below */
110 static int pci_uio_map_resource(struct rte_pci_device *dev);
112 #ifdef RTE_EAL_UNBIND_PORTS
113 #define PROC_MODULES "/proc/modules"
115 #define IGB_UIO_NAME "igb_uio"
117 #define UIO_DRV_PATH "/sys/bus/pci/drivers/%s"
119 /* maximum time to wait that /dev/uioX appears */
120 #define UIO_DEV_WAIT_TIMEOUT 3 /* seconds */
123 * Check that a kernel module is loaded. Returns 0 on success, or if the
124 * parameter is NULL, or -1 if the module is not loaded.
127 pci_uio_check_module(const char *module_name)
133 if (module_name == NULL)
136 f = fopen(PROC_MODULES, "r");
138 RTE_LOG(ERR, EAL, "Cannot open "PROC_MODULES": %s\n",
143 while(fgets(buf, sizeof(buf), f) != NULL) {
145 for (i = 0; i < sizeof(buf) && buf[i] != '\0'; i++) {
150 if (strncmp(buf, module_name, sizeof(buf)) == 0) {
159 /* bind a PCI to the kernel module driver */
161 pci_bind_device(struct rte_pci_device *dev, char dr_path[])
166 char dev_bind[PATH_MAX];
167 struct rte_pci_addr *loc = &dev->addr;
169 n = rte_snprintf(dev_bind, sizeof(dev_bind), "%s/bind", dr_path);
170 if ((n < 0) || (n >= (int)sizeof(buf))) {
171 RTE_LOG(ERR, EAL, "Cannot rte_snprintf device bind path\n");
175 f = fopen(dev_bind, "w");
177 RTE_LOG(ERR, EAL, "Cannot open %s\n", dev_bind);
180 n = rte_snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n",
181 loc->domain, loc->bus, loc->devid, loc->function);
182 if ((n < 0) || (n >= (int)sizeof(buf))) {
183 RTE_LOG(ERR, EAL, "Cannot rte_snprintf PCI infos\n");
187 if (fwrite(buf, n, 1, f) == 0) {
197 pci_uio_bind_device(struct rte_pci_device *dev, const char *module_name)
202 char uio_newid[PATH_MAX];
203 char uio_bind[PATH_MAX];
205 n = rte_snprintf(uio_newid, sizeof(uio_newid), UIO_DRV_PATH "/new_id", module_name);
206 if ((n < 0) || (n >= (int)sizeof(uio_newid))) {
207 RTE_LOG(ERR, EAL, "Cannot rte_snprintf uio_newid name\n");
211 n = rte_snprintf(uio_bind, sizeof(uio_bind), UIO_DRV_PATH, module_name);
212 if ((n < 0) || (n >= (int)sizeof(uio_bind))) {
213 RTE_LOG(ERR, EAL, "Cannot rte_snprintf uio_bind name\n");
217 n = rte_snprintf(buf, sizeof(buf), "%x %x\n",
218 dev->id.vendor_id, dev->id.device_id);
219 if ((n < 0) || (n >= (int)sizeof(buf))) {
220 RTE_LOG(ERR, EAL, "Cannot rte_snprintf vendor_id/device_id\n");
224 f = fopen(uio_newid, "w");
226 RTE_LOG(ERR, EAL, "Cannot open %s\n", uio_newid);
229 if (fwrite(buf, n, 1, f) == 0) {
235 pci_bind_device(dev, uio_bind);
239 /* unbind kernel driver for this device */
241 pci_unbind_kernel_driver(struct rte_pci_device *dev)
245 char filename[PATH_MAX];
247 struct rte_pci_addr *loc = &dev->addr;
249 /* open /sys/bus/pci/devices/AAAA:BB:CC.D/driver */
250 rte_snprintf(filename, sizeof(filename),
251 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/driver/unbind",
252 loc->domain, loc->bus, loc->devid, loc->function);
254 f = fopen(filename, "w");
255 if (f == NULL) /* device was not bound */
258 n = rte_snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n",
259 loc->domain, loc->bus, loc->devid, loc->function);
260 if ((n < 0) || (n >= (int)sizeof(buf))) {
261 RTE_LOG(ERR, EAL, "%s(): rte_snprintf failed\n", __func__);
264 if (fwrite(buf, n, 1, f) == 0) {
265 RTE_LOG(ERR, EAL, "%s(): could not write to %s\n", __func__,
280 pci_switch_module(struct rte_pci_driver *dr, struct rte_pci_device *dev,
281 int uio_status, const char *module_name)
283 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
284 /* check that our driver is loaded */
285 if (uio_status != 0 &&
286 (uio_status = pci_uio_check_module(module_name)) != 0)
287 rte_exit(EXIT_FAILURE, "The %s module is required by the "
288 "%s driver\n", module_name, dr->name);
290 /* unbind current driver, bind ours */
291 if (pci_unbind_kernel_driver(dev) < 0)
293 if (pci_uio_bind_device(dev, module_name) < 0)
296 /* map the NIC resources */
297 if (pci_uio_map_resource(dev) < 0)
303 #endif /* ifdef EAL_UNBIND_PORTS */
305 /* map a particular resource from a file */
307 pci_map_resource(struct rte_pci_device *dev, void *requested_addr,
308 const char *devname, off_t offset, size_t size)
313 #ifdef RTE_EAL_UNBIND_PORTS
315 * open devname, and mmap it: it can take some time to
316 * appear, so we wait some time before returning an error
319 fd = dev->intr_handle.fd;
320 for (n = 0; n < UIO_DEV_WAIT_TIMEOUT*10 && fd < 0; n++) {
322 if ((fd = open(devname, O_RDWR)) < 0 && errno != ENOENT)
328 * open devname, to mmap it
330 fd = open(devname, O_RDWR);
333 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
334 devname, strerror(errno));
338 /* Map the PCI memory resource of device */
339 mapaddr = mmap(requested_addr, size, PROT_READ | PROT_WRITE,
340 MAP_SHARED, fd, offset);
341 if (mapaddr == MAP_FAILED ||
342 (requested_addr != NULL && mapaddr != requested_addr)) {
343 RTE_LOG(ERR, EAL, "%s(): cannot mmap(%s(%d), %p, 0x%lx, 0x%lx):"
344 " %s (%p)\n", __func__, devname, fd, requested_addr,
345 (unsigned long)size, (unsigned long)offset,
346 strerror(errno), mapaddr);
350 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
351 /* save fd if in primary process */
352 dev->intr_handle.fd = fd;
353 dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
355 /* fd is not needed in slave process, close it */
356 dev->intr_handle.fd = -1;
357 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
361 RTE_LOG(DEBUG, EAL, " PCI memory mapped at %p\n", mapaddr);
366 dev->intr_handle.fd = -1;
367 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
372 #define OFF_MAX ((uint64_t)(off_t)-1)
374 pci_uio_get_mappings(const char *devname, struct uio_map maps[], size_t nb_maps)
377 char dirname[PATH_MAX];
378 char filename[PATH_MAX];
379 uint64_t offset, size;
381 for (i = 0; i != nb_maps; i++) {
383 /* check if map directory exists */
384 rte_snprintf(dirname, sizeof(dirname),
385 "%s/maps/map%u", devname, i);
387 if (access(dirname, F_OK) != 0)
390 /* get mapping offset */
391 rte_snprintf(filename, sizeof(filename),
392 "%s/offset", dirname);
393 if (pci_parse_sysfs_value(filename, &offset) < 0) {
395 "%s(): cannot parse offset of %s\n",
400 /* get mapping size */
401 rte_snprintf(filename, sizeof(filename),
403 if (pci_parse_sysfs_value(filename, &size) < 0) {
405 "%s(): cannot parse size of %s\n",
410 /* get mapping physical address */
411 rte_snprintf(filename, sizeof(filename),
413 if (pci_parse_sysfs_value(filename, &maps[i].phaddr) < 0) {
415 "%s(): cannot parse addr of %s\n",
420 if ((offset > OFF_MAX) || (size > SIZE_MAX)) {
422 "%s(): offset/size exceed system max value\n",
427 maps[i].offset = offset;
434 pci_uio_map_secondary(struct rte_pci_device *dev)
437 struct uio_resource *uio_res;
439 TAILQ_FOREACH(uio_res, uio_res_list, next) {
441 /* skip this element if it doesn't match our PCI address */
442 if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
445 for (i = 0; i != uio_res->nb_maps; i++) {
446 if (pci_map_resource(dev, uio_res->maps[i].addr,
448 (off_t)uio_res->maps[i].offset,
449 (size_t)uio_res->maps[i].size) !=
450 uio_res->maps[i].addr) {
452 "Cannot mmap device resource\n");
459 RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
463 /* map the PCI resource of a PCI device in virtual memory */
465 pci_uio_map_resource(struct rte_pci_device *dev)
470 char dirname[PATH_MAX];
471 char dirname2[PATH_MAX];
472 char devname[PATH_MAX]; /* contains the /dev/uioX */
479 struct rte_pci_addr *loc = &dev->addr;
480 struct uio_resource *uio_res;
481 struct uio_map *maps;
483 dev->intr_handle.fd = -1;
485 /* secondary processes - use already recorded details */
486 if (rte_eal_process_type() != RTE_PROC_PRIMARY)
487 return (pci_uio_map_secondary(dev));
489 /* depending on kernel version, uio can be located in uio/uioX
492 rte_snprintf(dirname, sizeof(dirname),
493 "/sys/bus/pci/devices/" PCI_PRI_FMT "/uio",
494 loc->domain, loc->bus, loc->devid, loc->function);
496 dir = opendir(dirname);
498 /* retry with the parent directory */
499 rte_snprintf(dirname, sizeof(dirname),
500 "/sys/bus/pci/devices/" PCI_PRI_FMT,
501 loc->domain, loc->bus, loc->devid, loc->function);
502 dir = opendir(dirname);
505 RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
510 /* take the first file starting with "uio" */
511 while ((e = readdir(dir)) != NULL) {
512 /* format could be uio%d ...*/
513 int shortprefix_len = sizeof("uio") - 1;
514 /* ... or uio:uio%d */
515 int longprefix_len = sizeof("uio:uio") - 1;
518 if (strncmp(e->d_name, "uio", 3) != 0)
521 /* first try uio%d */
523 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
524 if (errno == 0 && endptr != e->d_name) {
525 rte_snprintf(dirname2, sizeof(dirname2),
526 "%s/uio%u", dirname, uio_num);
530 /* then try uio:uio%d */
532 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
533 if (errno == 0 && endptr != e->d_name) {
534 rte_snprintf(dirname2, sizeof(dirname2),
535 "%s/uio:uio%u", dirname, uio_num);
541 /* No uio resource found */
543 RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, "
544 "skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
548 /* allocate the mapping details for secondary processes*/
549 if ((uio_res = rte_zmalloc("UIO_RES", sizeof (*uio_res), 0)) == NULL) {
551 "%s(): cannot store uio mmap details\n", __func__);
555 rte_snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
556 rte_snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
557 memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
559 /* collect info about device mappings */
560 if ((nb_maps = pci_uio_get_mappings(dirname2, uio_res->maps,
561 sizeof (uio_res->maps) / sizeof (uio_res->maps[0])))
565 uio_res->nb_maps = nb_maps;
568 pagesz = sysconf(_SC_PAGESIZE);
570 maps = uio_res->maps;
571 for (i = 0; i != PCI_MAX_RESOURCE; i++) {
574 if ((phaddr = dev->mem_resource[i].phys_addr) == 0)
577 for (j = 0; j != nb_maps && (phaddr != maps[j].phaddr ||
578 dev->mem_resource[i].len != maps[j].size);
582 /* if matching map is found, then use it */
585 if (maps[j].addr != NULL ||
586 (mapaddr = pci_map_resource(dev,
587 NULL, devname, (off_t)offset,
588 (size_t)maps[j].size)) == NULL) {
592 maps[j].addr = mapaddr;
593 maps[j].offset = offset;
594 dev->mem_resource[i].addr = mapaddr;
598 TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
603 /* parse the "resource" sysfs file */
604 #define IORESOURCE_MEM 0x00000200
607 pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev)
611 union pci_resource_info {
617 char *ptrs[PCI_RESOURCE_FMT_NVAL];
620 uint64_t phys_addr, end_addr, flags;
622 f = fopen(filename, "r");
624 RTE_LOG(ERR, EAL, "Cannot open sysfs resource\n");
628 for (i = 0; i<PCI_MAX_RESOURCE; i++) {
630 if (fgets(buf, sizeof(buf), f) == NULL) {
632 "%s(): cannot read resource\n", __func__);
636 if (rte_strsplit(buf, sizeof(buf), res_info.ptrs, 3, ' ') != 3) {
638 "%s(): bad resource format\n", __func__);
642 phys_addr = strtoull(res_info.phys_addr, NULL, 16);
643 end_addr = strtoull(res_info.end_addr, NULL, 16);
644 flags = strtoull(res_info.flags, NULL, 16);
647 "%s(): bad resource format\n", __func__);
651 if (flags & IORESOURCE_MEM) {
652 dev->mem_resource[i].phys_addr = phys_addr;
653 dev->mem_resource[i].len = end_addr - phys_addr + 1;
654 /* not mapped for now */
655 dev->mem_resource[i].addr = NULL;
667 * parse a sysfs file containing one integer value
668 * different to the eal version, as it needs to work with 64-bit values
671 pci_parse_sysfs_value(const char *filename, uint64_t *val)
677 f = fopen(filename, "r");
679 RTE_LOG(ERR, EAL, "%s(): cannot open sysfs value %s\n",
684 if (fgets(buf, sizeof(buf), f) == NULL) {
685 RTE_LOG(ERR, EAL, "%s(): cannot read sysfs value %s\n",
690 *val = strtoull(buf, &end, 0);
691 if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
692 RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs value %s\n",
701 /* Compare two PCI device addresses. */
703 pci_addr_comparison(struct rte_pci_addr *addr, struct rte_pci_addr *addr2)
705 uint64_t dev_addr = (addr->domain << 24) + (addr->bus << 16) + (addr->devid << 8) + addr->function;
706 uint64_t dev_addr2 = (addr2->domain << 24) + (addr2->bus << 16) + (addr2->devid << 8) + addr2->function;
708 if (dev_addr > dev_addr2)
715 /* Scan one pci sysfs entry, and fill the devices list from it. */
717 pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
718 uint8_t devid, uint8_t function)
720 char filename[PATH_MAX];
722 struct rte_pci_device *dev;
724 dev = malloc(sizeof(*dev));
729 memset(dev, 0, sizeof(*dev));
730 dev->addr.domain = domain;
732 dev->addr.devid = devid;
733 dev->addr.function = function;
736 rte_snprintf(filename, sizeof(filename), "%s/vendor", dirname);
737 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
741 dev->id.vendor_id = (uint16_t)tmp;
744 rte_snprintf(filename, sizeof(filename), "%s/device", dirname);
745 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
749 dev->id.device_id = (uint16_t)tmp;
751 /* get subsystem_vendor id */
752 rte_snprintf(filename, sizeof(filename), "%s/subsystem_vendor",
754 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
758 dev->id.subsystem_vendor_id = (uint16_t)tmp;
760 /* get subsystem_device id */
761 rte_snprintf(filename, sizeof(filename), "%s/subsystem_device",
763 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
767 dev->id.subsystem_device_id = (uint16_t)tmp;
771 rte_snprintf(filename, sizeof(filename), "%s/max_vfs", dirname);
772 if (!access(filename, F_OK) &&
773 eal_parse_sysfs_value(filename, &tmp) == 0) {
774 dev->max_vfs = (uint16_t)tmp;
778 rte_snprintf(filename, sizeof(filename), "%s/numa_node",
780 if (access(filename, R_OK) != 0) {
781 /* if no NUMA support just set node to 0 */
784 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
788 dev->numa_node = tmp;
791 /* parse resources */
792 rte_snprintf(filename, sizeof(filename), "%s/resource", dirname);
793 if (pci_parse_sysfs_resource(filename, dev) < 0) {
794 RTE_LOG(ERR, EAL, "%s(): cannot parse resource\n", __func__);
799 /* device is valid, add in list (sorted) */
800 if (TAILQ_EMPTY(&device_list)) {
801 TAILQ_INSERT_TAIL(&device_list, dev, next);
804 struct rte_pci_device *dev2 = NULL;
806 TAILQ_FOREACH(dev2, &device_list, next) {
807 if (pci_addr_comparison(&dev->addr, &dev2->addr))
810 TAILQ_INSERT_BEFORE(dev2, dev, next);
814 TAILQ_INSERT_TAIL(&device_list, dev, next);
821 * split up a pci address into its constituent parts.
824 parse_pci_addr_format(const char *buf, int bufsize, uint16_t *domain,
825 uint8_t *bus, uint8_t *devid, uint8_t *function)
827 /* first split on ':' */
835 char *str[PCI_FMT_NVAL]; /* last element-separator is "." not ":" */
838 char *buf_copy = strndup(buf, bufsize);
839 if (buf_copy == NULL)
842 if (rte_strsplit(buf_copy, bufsize, splitaddr.str, PCI_FMT_NVAL, ':')
845 /* final split is on '.' between devid and function */
846 splitaddr.function = strchr(splitaddr.devid,'.');
847 if (splitaddr.function == NULL)
849 *splitaddr.function++ = '\0';
851 /* now convert to int values */
853 *domain = (uint16_t)strtoul(splitaddr.domain, NULL, 16);
854 *bus = (uint8_t)strtoul(splitaddr.bus, NULL, 16);
855 *devid = (uint8_t)strtoul(splitaddr.devid, NULL, 16);
856 *function = (uint8_t)strtoul(splitaddr.function, NULL, 10);
860 free(buf_copy); /* free the copy made with strdup */
868 * Scan the content of the PCI bus, and the devices in the devices
876 char dirname[PATH_MAX];
878 uint8_t bus, devid, function;
880 dir = opendir(SYSFS_PCI_DEVICES);
882 RTE_LOG(ERR, EAL, "%s(): opendir failed: %s\n",
883 __func__, strerror(errno));
887 while ((e = readdir(dir)) != NULL) {
888 if (e->d_name[0] == '.')
891 if (parse_pci_addr_format(e->d_name, sizeof(e->d_name), &domain,
892 &bus, &devid, &function) != 0)
895 rte_snprintf(dirname, sizeof(dirname), "%s/%s", SYSFS_PCI_DEVICES,
897 if (pci_scan_one(dirname, domain, bus, devid, function) < 0)
909 * If vendor/device ID match, call the devinit() function of the
913 rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *dev)
915 struct rte_pci_id *id_table;
916 #ifdef RTE_EAL_UNBIND_PORTS
917 const char *module_name = NULL;
920 if (dr->drv_flags & RTE_PCI_DRV_NEED_IGB_UIO)
921 module_name = IGB_UIO_NAME;
924 for (id_table = dr->id_table ; id_table->vendor_id != 0; id_table++) {
926 /* check if device's identifiers match the driver's ones */
927 if (id_table->vendor_id != dev->id.vendor_id &&
928 id_table->vendor_id != PCI_ANY_ID)
930 if (id_table->device_id != dev->id.device_id &&
931 id_table->device_id != PCI_ANY_ID)
933 if (id_table->subsystem_vendor_id != dev->id.subsystem_vendor_id &&
934 id_table->subsystem_vendor_id != PCI_ANY_ID)
936 if (id_table->subsystem_device_id != dev->id.subsystem_device_id &&
937 id_table->subsystem_device_id != PCI_ANY_ID)
940 struct rte_pci_addr *loc = &dev->addr;
942 RTE_LOG(DEBUG, EAL, "PCI device "PCI_PRI_FMT" on NUMA socket %i\n",
943 loc->domain, loc->bus, loc->devid, loc->function,
946 RTE_LOG(DEBUG, EAL, " probe driver: %x:%x %s\n", dev->id.vendor_id,
947 dev->id.device_id, dr->name);
949 /* no initialization when blacklisted, return without error */
950 if (dev->blacklisted) {
951 RTE_LOG(DEBUG, EAL, " Device is blacklisted, not initializing\n");
955 #ifdef RTE_EAL_UNBIND_PORTS
956 /* Unbind PCI devices if needed */
957 if (module_name != NULL)
958 if (pci_switch_module(dr, dev, uio_status, module_name) < 0)
961 /* just map the NIC resources */
962 if (pci_uio_map_resource(dev) < 0)
966 /* We always should have BAR0 mapped */
967 if (rte_eal_process_type() == RTE_PROC_PRIMARY &&
968 dev->mem_resource[0].addr == NULL) {
970 "%s(): BAR0 is not mapped\n",
975 /* reference driver structure */
978 /* call the driver devinit() function */
979 return dr->devinit(dr, dev);
984 /* Init the PCI EAL subsystem */
986 rte_eal_pci_init(void)
988 TAILQ_INIT(&driver_list);
989 TAILQ_INIT(&device_list);
990 uio_res_list = RTE_TAILQ_RESERVE_BY_IDX(RTE_TAILQ_PCI, uio_res_list);
992 /* for debug purposes, PCI can be disabled */
993 if (internal_config.no_pci)
996 if (pci_scan() < 0) {
997 RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);