[dpdk-dev] [PATCH v2 01/16] Separate igb_uio mapping into a separate file

[Anatoly Burakov <anatoly.burakov@intel.com>]

In order to make the code a bit more clean while using multiple
drivers, IGB_UIO mapping has been separated into its own file.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_eal/linuxapp/eal/Makefile               |    1 +
 lib/librte_eal/linuxapp/eal/eal_pci.c              |  424 +-------------------
 lib/librte_eal/linuxapp/eal/eal_pci_uio.c          |  403 +++++++++++++++++++
 lib/librte_eal/linuxapp/eal/include/eal_pci_init.h |   65 +++
 4 files changed, 478 insertions(+), 415 deletions(-)
 create mode 100644 lib/librte_eal/linuxapp/eal/eal_pci_uio.c
 create mode 100644 lib/librte_eal/linuxapp/eal/include/eal_pci_init.h

diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
index b00e3ec..527fa2a 100644
--- a/lib/librte_eal/linuxapp/eal/Makefile
+++ b/lib/librte_eal/linuxapp/eal/Makefile
@@ -57,6 +57,7 @@ endif
 SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_thread.c
 SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_log.c
 SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci.c
+SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci_uio.c
 SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_debug.c
 SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_lcore.c
 SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_timer.c
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index ac2c1fe..cd5b797 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -31,82 +31,31 @@
  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <inttypes.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <errno.h>
 #include <dirent.h>
-#include <limits.h>
-#include <sys/queue.h>
 #include <sys/mman.h>
-#include <sys/ioctl.h>
 
-#include <rte_interrupts.h>
 #include <rte_log.h>
 #include <rte_pci.h>
-#include <rte_common.h>
-#include <rte_launch.h>
-#include <rte_memory.h>
-#include <rte_memzone.h>
 #include <rte_tailq.h>
-#include <rte_eal.h>
 #include <rte_eal_memconfig.h>
-#include <rte_per_lcore.h>
-#include <rte_lcore.h>
-#include <rte_malloc.h>
-#include <rte_string_fns.h>
-#include <rte_debug.h>
 #include <rte_devargs.h>
 
 #include "rte_pci_dev_ids.h"
 #include "eal_filesystem.h"
 #include "eal_private.h"
+#include "eal_pci_init.h"
 
 /**
  * @file
  * PCI probing under linux
  *
  * This code is used to simulate a PCI probe by parsing information in
- * sysfs. Moreover, when a registered driver matches a device, the
- * kernel driver currently using it is unloaded and replaced by
- * igb_uio module, which is a very minimal userland driver for Intel
- * network card, only providing access to PCI BAR to applications, and
- * enabling bus master.
+ * sysfs. When a registered device matches a driver, it is then initialized
+ * with either VFIO or IGB_UIO driver (or doesn't initialize), whichever
+ * driver the device is bound to.
  */
 
-struct uio_map {
-	void *addr;
-	uint64_t offset;
-	uint64_t size;
-	uint64_t phaddr;
-};
-
-/*
- * For multi-process we need to reproduce all PCI mappings in secondary
- * processes, so save them in a tailq.
- */
-struct uio_resource {
-	TAILQ_ENTRY(uio_resource) next;
-
-	struct rte_pci_addr pci_addr;
-	char path[PATH_MAX];
-	size_t nb_maps;
-	struct uio_map maps[PCI_MAX_RESOURCE];
-};
-
-TAILQ_HEAD(uio_res_list, uio_resource);
-
-static struct uio_res_list *uio_res_list = NULL;
-static int pci_parse_sysfs_value(const char *filename, uint64_t *val);
-
 /* unbind kernel driver for this device */
 static int
 pci_unbind_kernel_driver(struct rte_pci_device *dev)
@@ -147,31 +96,19 @@ error:
 }
 
 /* map a particular resource from a file */
-static void *
-pci_map_resource(void *requested_addr, const char *devname, off_t offset,
+void *
+pci_map_resource(void *requested_addr, int fd, off_t offset,
 		 size_t size)
 {
-	int fd;
 	void *mapaddr;
 
-	/*
-	 * open devname, to mmap it
-	 */
-	fd = open(devname, O_RDWR);
-	if (fd < 0) {
-		RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
-			devname, strerror(errno));
-		goto fail;
-	}
-
 	/* Map the PCI memory resource of device */
 	mapaddr = mmap(requested_addr, size, PROT_READ | PROT_WRITE,
 			MAP_SHARED, fd, offset);
-	close(fd);
 	if (mapaddr == MAP_FAILED ||
 			(requested_addr != NULL && mapaddr != requested_addr)) {
-		RTE_LOG(ERR, EAL, "%s(): cannot mmap(%s(%d), %p, 0x%lx, 0x%lx):"
-			" %s (%p)\n", __func__, devname, fd, requested_addr,
+		RTE_LOG(ERR, EAL, "%s(): cannot mmap(%d, %p, 0x%lx, 0x%lx):"
+			" %s (%p)\n", __func__, fd, requested_addr,
 			(unsigned long)size, (unsigned long)offset,
 			strerror(errno), mapaddr);
 		goto fail;
@@ -185,314 +122,6 @@ fail:
 	return NULL;
 }
 
-#define OFF_MAX              ((uint64_t)(off_t)-1)
-static ssize_t
-pci_uio_get_mappings(const char *devname, struct uio_map maps[], size_t nb_maps)
-{
-	size_t i;
-	char dirname[PATH_MAX];
-	char filename[PATH_MAX];
-	uint64_t offset, size;
-
-	for (i = 0; i != nb_maps; i++) {
- 
-		/* check if map directory exists */
-		rte_snprintf(dirname, sizeof(dirname), 
-			"%s/maps/map%u", devname, i);
- 
-		if (access(dirname, F_OK) != 0)
-			break;
- 
-		/* get mapping offset */
-		rte_snprintf(filename, sizeof(filename),
-			"%s/offset", dirname);
-		if (pci_parse_sysfs_value(filename, &offset) < 0) {
-			RTE_LOG(ERR, EAL,
-				"%s(): cannot parse offset of %s\n",
-				__func__, dirname);
-			return (-1);
-		}
- 
-		/* get mapping size */
-		rte_snprintf(filename, sizeof(filename),
-			"%s/size", dirname);
-		if (pci_parse_sysfs_value(filename, &size) < 0) {
-			RTE_LOG(ERR, EAL,
-				"%s(): cannot parse size of %s\n",
-				__func__, dirname);
-			return (-1);
-		}
- 
-		/* get mapping physical address */
-		rte_snprintf(filename, sizeof(filename),
-			"%s/addr", dirname);
-		if (pci_parse_sysfs_value(filename, &maps[i].phaddr) < 0) {
-			RTE_LOG(ERR, EAL,
-				"%s(): cannot parse addr of %s\n",
-				__func__, dirname);
-			return (-1);
-		}
-
-		if ((offset > OFF_MAX) || (size > SIZE_MAX)) {
-			RTE_LOG(ERR, EAL,
-				"%s(): offset/size exceed system max value\n",
-				__func__); 
-			return (-1);
-		}
-
-		maps[i].offset = offset;
-		maps[i].size = size;
-        }
-	return (i);
-}
-
-static int
-pci_uio_map_secondary(struct rte_pci_device *dev)
-{
-        size_t i;
-        struct uio_resource *uio_res;
-
-	TAILQ_FOREACH(uio_res, uio_res_list, next) {
-
-		/* skip this element if it doesn't match our PCI address */
-		if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
-			continue;
-
-		for (i = 0; i != uio_res->nb_maps; i++) {
-			if (pci_map_resource(uio_res->maps[i].addr,
-					     uio_res->path,
-					     (off_t)uio_res->maps[i].offset,
-					     (size_t)uio_res->maps[i].size)
-			    != uio_res->maps[i].addr) {
-				RTE_LOG(ERR, EAL,
-					"Cannot mmap device resource\n");
-				return (-1);
-			}
-		}
-		return (0);
-	}
-
-	RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
-	return -1;
-}
-
-static int pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num)
-{
-	FILE *f;
-	char filename[PATH_MAX];
-	int ret;
-	unsigned major, minor;
-	dev_t dev;
-
-	/* get the name of the sysfs file that contains the major and minor
-	 * of the uio device and read its content */
-	rte_snprintf(filename, sizeof(filename), "%s/dev", sysfs_uio_path);
-
-	f = fopen(filename, "r");
-	if (f == NULL) {
-		RTE_LOG(ERR, EAL, "%s(): cannot open sysfs to get major:minor\n",
-			__func__);
-		return -1;
-	}
-
-	ret = fscanf(f, "%d:%d", &major, &minor);
-	if (ret != 2) {
-		RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs to get major:minor\n",
-			__func__);
-		fclose(f);
-		return -1;
-	}
-	fclose(f);
-
-	/* create the char device "mknod /dev/uioX c major minor" */
-	rte_snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
-	dev = makedev(major, minor);
-	ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev);
-	if (f == NULL) {
-		RTE_LOG(ERR, EAL, "%s(): mknod() failed %s\n",
-			__func__, strerror(errno));
-		return -1;
-	}
-
-	return ret;
-}
-
-/*
- * Return the uioX char device used for a pci device. On success, return
- * the UIO number and fill dstbuf string with the path of the device in
- * sysfs. On error, return a negative value. In this case dstbuf is
- * invalid.
- */
-static int pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
-			   unsigned int buflen)
-{
-	struct rte_pci_addr *loc = &dev->addr;
-	unsigned int uio_num;
-	struct dirent *e;
-	DIR *dir;
-	char dirname[PATH_MAX];
-
-	/* depending on kernel version, uio can be located in uio/uioX
-	 * or uio:uioX */
-
-	rte_snprintf(dirname, sizeof(dirname),
-	         SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
-	         loc->domain, loc->bus, loc->devid, loc->function);
-
-	dir = opendir(dirname);
-	if (dir == NULL) {
-		/* retry with the parent directory */
-		rte_snprintf(dirname, sizeof(dirname),
-		         SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
-		         loc->domain, loc->bus, loc->devid, loc->function);
-		dir = opendir(dirname);
-
-		if (dir == NULL) {
-			RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
-			return -1;
-		}
-	}
-
-	/* take the first file starting with "uio" */
-	while ((e = readdir(dir)) != NULL) {
-		/* format could be uio%d ...*/
-		int shortprefix_len = sizeof("uio") - 1;
-		/* ... or uio:uio%d */
-		int longprefix_len = sizeof("uio:uio") - 1; 
-		char *endptr;
-
-		if (strncmp(e->d_name, "uio", 3) != 0)
-			continue;
-
-		/* first try uio%d */
-		errno = 0;
-		uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
-		if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
-			rte_snprintf(dstbuf, buflen, "%s/uio%u", dirname, uio_num);
-			break;
-		}
-
-		/* then try uio:uio%d */
-		errno = 0;
-		uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
-		if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
-			rte_snprintf(dstbuf, buflen, "%s/uio:uio%u", dirname, uio_num);
-			break;
-		}
-	}
-	closedir(dir);
-
-	/* No uio resource found */
-	if (e == NULL)
-		return -1;
-
-	/* create uio device if we've been asked to */
-	if (internal_config.create_uio_dev && pci_mknod_uio_dev(dstbuf, uio_num) < 0)
-		RTE_LOG(WARNING, EAL, "Cannot create /dev/uio%u\n", uio_num);
-
-	return uio_num;
-}
-
-/* map the PCI resource of a PCI device in virtual memory */
-static int
-pci_uio_map_resource(struct rte_pci_device *dev)
-{
-	int i, j;
-	char dirname[PATH_MAX];
-	char devname[PATH_MAX]; /* contains the /dev/uioX */
-	void *mapaddr;
-	int uio_num;
-	uint64_t phaddr;
-	uint64_t offset;
-	uint64_t pagesz;
-	ssize_t nb_maps;
-	struct rte_pci_addr *loc = &dev->addr;
-	struct uio_resource *uio_res;
-	struct uio_map *maps;
-
-	dev->intr_handle.fd = -1;
-	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
-
-	/* secondary processes - use already recorded details */
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
-		return (pci_uio_map_secondary(dev));
-
-	/* find uio resource */
-	uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname));
-	if (uio_num < 0) {
-		RTE_LOG(WARNING, EAL, "  "PCI_PRI_FMT" not managed by UIO driver, "
-				"skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
-		return -1;
-	}
-	rte_snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
-
-	/* save fd if in primary process */
-	dev->intr_handle.fd = open(devname, O_RDWR);
-	if (dev->intr_handle.fd < 0) {
-		RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
-			devname, strerror(errno));
-		return -1;
-	}
-	dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
-
-	/* allocate the mapping details for secondary processes*/
-	if ((uio_res = rte_zmalloc("UIO_RES", sizeof (*uio_res), 0)) == NULL) {
-		RTE_LOG(ERR, EAL,
-			"%s(): cannot store uio mmap details\n", __func__);
-		return (-1);
-	}
-
-	rte_snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
-	memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
-
-	/* collect info about device mappings */
-	nb_maps = pci_uio_get_mappings(dirname, uio_res->maps,
-				       RTE_DIM(uio_res->maps));
-	if (nb_maps < 0) {
-		rte_free(uio_res);
-		return (nb_maps);
-	}
-
-	uio_res->nb_maps = nb_maps;
-
-	/* Map all BARs */
-	pagesz = sysconf(_SC_PAGESIZE);
-
-	maps = uio_res->maps;
-	for (i = 0; i != PCI_MAX_RESOURCE; i++) {
-
-		/* skip empty BAR */
-		if ((phaddr = dev->mem_resource[i].phys_addr) == 0)
-			continue;
-
-		for (j = 0; j != nb_maps && (phaddr != maps[j].phaddr ||
-				dev->mem_resource[i].len != maps[j].size);
-				j++)
-			;
-
-		/* if matching map is found, then use it */
-		if (j != nb_maps) {
-			offset = j * pagesz;
-			if (maps[j].addr != NULL ||
-			    (mapaddr = pci_map_resource(NULL, devname,
-							(off_t)offset,
-							(size_t)maps[j].size)
-			    ) == NULL) {
-				rte_free(uio_res);
-				return (-1);
-			}
-
-			maps[j].addr = mapaddr;
-			maps[j].offset = offset;
-			dev->mem_resource[i].addr = mapaddr;
-		}
-	}
-
-	TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
-
-	return (0);
-}
-
 /* parse the "resource" sysfs file */
 #define IORESOURCE_MEM  0x00000200
 
@@ -556,41 +185,6 @@ error:
 	return -1;
 }
 
-/* 
- * parse a sysfs file containing one integer value 
- * different to the eal version, as it needs to work with 64-bit values
- */ 
-static int 
-pci_parse_sysfs_value(const char *filename, uint64_t *val) 
-{
-        FILE *f;
-        char buf[BUFSIZ];
-        char *end = NULL;
- 
-        f = fopen(filename, "r");
-        if (f == NULL) {
-                RTE_LOG(ERR, EAL, "%s(): cannot open sysfs value %s\n",
-                        __func__, filename);
-                return -1;
-        }
- 
-        if (fgets(buf, sizeof(buf), f) == NULL) {
-                RTE_LOG(ERR, EAL, "%s(): cannot read sysfs value %s\n",
-                        __func__, filename);
-                fclose(f);
-                return -1;
-        }
-        *val = strtoull(buf, &end, 0);
-        if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
-                RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs value %s\n",
-                                __func__, filename);
-                fclose(f);
-                return -1;
-        }
-        fclose(f);
-        return 0;
-}
-
 /* Compare two PCI device addresses. */
 static int
 pci_addr_comparison(struct rte_pci_addr *addr, struct rte_pci_addr *addr2)
@@ -866,7 +460,7 @@ rte_eal_pci_init(void)
 {
 	TAILQ_INIT(&pci_driver_list);
 	TAILQ_INIT(&pci_device_list);
-	uio_res_list = RTE_TAILQ_RESERVE_BY_IDX(RTE_TAILQ_PCI, uio_res_list);
+	pci_res_list = RTE_TAILQ_RESERVE_BY_IDX(RTE_TAILQ_PCI, mapped_pci_res_list);
 
 	/* for debug purposes, PCI can be disabled */
 	if (internal_config.no_pci)
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
new file mode 100644
index 0000000..f29fee5
--- /dev/null
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
@@ -0,0 +1,403 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <sys/stat.h>
+
+#include <rte_log.h>
+#include <rte_pci.h>
+#include <rte_common.h>
+#include <rte_malloc.h>
+#include <rte_tailq.h>
+
+#include "rte_pci_dev_ids.h"
+#include "eal_filesystem.h"
+#include "eal_pci_init.h"
+
+static int pci_parse_sysfs_value(const char *filename, uint64_t *val);
+
+#define OFF_MAX              ((uint64_t)(off_t)-1)
+static ssize_t
+pci_uio_get_mappings(const char *devname, struct pci_map maps[], size_t nb_maps) {
+	size_t i;
+	char dirname[PATH_MAX];
+	char filename[PATH_MAX];
+	uint64_t offset, size;
+
+	for (i = 0; i != nb_maps; i++) {
+
+		/* check if map directory exists */
+		rte_snprintf(dirname, sizeof(dirname), "%s/maps/map%u", devname, i);
+
+		if (access(dirname, F_OK) != 0)
+			break;
+
+		/* get mapping offset */
+		rte_snprintf(filename, sizeof(filename), "%s/offset", dirname);
+		if (pci_parse_sysfs_value(filename, &offset) < 0) {
+			RTE_LOG(ERR, EAL,
+					"%s(): cannot parse offset of %s\n", __func__, dirname);
+			return (-1);
+		}
+
+		/* get mapping size */
+		rte_snprintf(filename, sizeof(filename), "%s/size", dirname);
+		if (pci_parse_sysfs_value(filename, &size) < 0) {
+			RTE_LOG(ERR, EAL,
+					"%s(): cannot parse size of %s\n", __func__, dirname);
+			return (-1);
+		}
+
+		/* get mapping physical address */
+		rte_snprintf(filename, sizeof(filename), "%s/addr", dirname);
+		if (pci_parse_sysfs_value(filename, &maps[i].phaddr) < 0) {
+			RTE_LOG(ERR, EAL,
+					"%s(): cannot parse addr of %s\n", __func__, dirname);
+			return (-1);
+		}
+
+		if ((offset > OFF_MAX) || (size > SIZE_MAX)) {
+			RTE_LOG(ERR, EAL,
+					"%s(): offset/size exceed system max value\n", __func__);
+			return (-1);
+		}
+
+		maps[i].offset = offset;
+		maps[i].size = size;
+	}
+
+	return (i);
+}
+
+static int
+pci_uio_map_secondary(struct rte_pci_device *dev) {
+	int fd, i;
+	struct mapped_pci_resource *uio_res;
+
+	TAILQ_FOREACH(uio_res, pci_res_list, next) {
+
+		/* skip this element if it doesn't match our PCI address */
+		if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
+			continue;
+
+		for (i = 0; i != uio_res->nb_maps; i++) {
+			/*
+			 * open devname, to mmap it
+			 */
+			fd = open(uio_res->path, O_RDWR);
+			if (fd < 0) {
+				RTE_LOG(ERR, EAL,
+						"Cannot open %s: %s\n", uio_res->path, strerror(errno));
+				return -1;
+			}
+
+			if (pci_map_resource(uio_res->maps[i].addr, fd,
+					(off_t) uio_res->maps[i].offset,
+					(size_t) uio_res->maps[i].size) != uio_res->maps[i].addr) {
+				RTE_LOG(ERR, EAL, "Cannot mmap device resource\n");
+				close(fd);
+				return (-1);
+			}
+			/* fd is not needed in slave process, close it */
+			close(fd);
+		}
+		return (0);
+	}
+
+	RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
+	return -1;
+}
+
+static int
+pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num) {
+	FILE *f;
+	char filename[PATH_MAX];
+	int ret;
+	unsigned major, minor;
+	dev_t dev;
+
+	/* get the name of the sysfs file that contains the major and minor
+	 * of the uio device and read its content */
+	rte_snprintf(filename, sizeof(filename), "%s/dev", sysfs_uio_path);
+
+	f = fopen(filename, "r");
+	if (f == NULL) {
+		RTE_LOG(ERR, EAL,
+				"%s(): cannot open sysfs to get major:minor\n", __func__);
+		return -1;
+	}
+
+	ret = fscanf(f, "%d:%d", &major, &minor);
+	if (ret != 2) {
+		RTE_LOG(ERR, EAL,
+				"%s(): cannot parse sysfs to get major:minor\n", __func__);
+		fclose(f);
+		return -1;
+	}
+	fclose(f);
+
+	/* create the char device "mknod /dev/uioX c major minor" */
+	rte_snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
+	dev = makedev(major, minor);
+	ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev);
+	if (f == NULL) {
+		RTE_LOG(ERR, EAL,
+				"%s(): mknod() failed %s\n", __func__, strerror(errno));
+		return -1;
+	}
+
+	return ret;
+}
+
+/*
+ * Return the uioX char device used for a pci device. On success, return
+ * the UIO number and fill dstbuf string with the path of the device in
+ * sysfs. On error, return a negative value. In this case dstbuf is
+ * invalid.
+ */
+static int
+pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
+		unsigned int buflen) {
+	struct rte_pci_addr *loc = &dev->addr;
+	unsigned int uio_num;
+	struct dirent *e;
+	DIR *dir;
+	char dirname[PATH_MAX];
+
+	/* depending on kernel version, uio can be located in uio/uioX
+	 * or uio:uioX */
+
+	rte_snprintf(dirname, sizeof(dirname),
+			SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio", loc->domain, loc->bus,
+			loc->devid, loc->function);
+
+	dir = opendir(dirname);
+	if (dir == NULL) {
+		/* retry with the parent directory */
+		rte_snprintf(dirname, sizeof(dirname),
+				SYSFS_PCI_DEVICES "/" PCI_PRI_FMT, loc->domain, loc->bus,
+				loc->devid, loc->function);
+		dir = opendir(dirname);
+
+		if (dir == NULL) {
+			RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
+			return -1;
+		}
+	}
+
+	/* take the first file starting with "uio" */
+	while ((e = readdir(dir)) != NULL) {
+		/* format could be uio%d ...*/
+		int shortprefix_len = sizeof("uio") - 1;
+		/* ... or uio:uio%d */
+		int longprefix_len = sizeof("uio:uio") - 1;
+		char *endptr;
+
+		if (strncmp(e->d_name, "uio", 3) != 0)
+			continue;
+
+		/* first try uio%d */errno = 0;
+		uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
+		if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
+			rte_snprintf(dstbuf, buflen, "%s/uio%u", dirname, uio_num);
+			break;
+		}
+
+		/* then try uio:uio%d */errno = 0;
+		uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
+		if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
+			rte_snprintf(dstbuf, buflen, "%s/uio:uio%u", dirname, uio_num);
+			break;
+		}
+	}
+	closedir(dir);
+
+	/* No uio resource found */
+	if (e == NULL)
+		return -1;
+
+	/* create uio device if we've been asked to */
+	if (internal_config.create_uio_dev
+			&& pci_mknod_uio_dev(dstbuf, uio_num) < 0)
+		RTE_LOG(WARNING, EAL, "Cannot create /dev/uio%u\n", uio_num);
+
+	return uio_num;
+}
+
+/* map the PCI resource of a PCI device in virtual memory */
+int
+pci_uio_map_resource(struct rte_pci_device *dev) {
+	int i, j;
+	char dirname[PATH_MAX];
+	char devname[PATH_MAX]; /* contains the /dev/uioX */
+	void *mapaddr;
+	int uio_num;
+	uint64_t phaddr;
+	uint64_t offset;
+	uint64_t pagesz;
+	ssize_t nb_maps;
+	struct rte_pci_addr *loc = &dev->addr;
+	struct mapped_pci_resource *uio_res;
+	struct pci_map *maps;
+
+	dev->intr_handle.fd = -1;
+	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+
+	/* secondary processes - use already recorded details */
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return (pci_uio_map_secondary(dev));
+
+	/* find uio resource */
+	uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname));
+	if (uio_num < 0) {
+		RTE_LOG(WARNING, EAL, "  "PCI_PRI_FMT" not managed by UIO driver, "
+		"skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
+		return -1;
+	}
+	rte_snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
+
+	/* save fd if in primary process */
+	dev->intr_handle.fd = open(devname, O_RDWR);
+	if (dev->intr_handle.fd < 0) {
+		RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", devname, strerror(errno));
+		return -1;
+	}
+	dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
+
+	/* allocate the mapping details for secondary processes*/
+	if ((uio_res = rte_zmalloc("UIO_RES", sizeof(*uio_res), 0)) == NULL) {
+		RTE_LOG(ERR, EAL, "%s(): cannot store uio mmap details\n", __func__);
+		return (-1);
+	}
+
+	rte_snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
+	memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
+
+	/* collect info about device mappings */
+	nb_maps = pci_uio_get_mappings(dirname, uio_res->maps,
+			RTE_DIM(uio_res->maps));
+	if (nb_maps < 0) {
+		rte_free(uio_res);
+		return (nb_maps);
+	}
+
+	uio_res->nb_maps = nb_maps;
+
+	/* Map all BARs */
+	pagesz = sysconf(_SC_PAGESIZE);
+
+	maps = uio_res->maps;
+	for (i = 0; i != PCI_MAX_RESOURCE; i++) {
+		int fd;
+
+		/* skip empty BAR */
+		if ((phaddr = dev->mem_resource[i].phys_addr) == 0)
+			continue;
+
+		for (j = 0;
+				j != nb_maps
+						&& (phaddr != maps[j].phaddr
+								|| dev->mem_resource[i].len != maps[j].size);
+				j++)
+			;
+
+		/* if matching map is found, then use it */
+		if (j != nb_maps) {
+			offset = j * pagesz;
+
+			/*
+			 * open devname, to mmap it
+			 */
+			fd = open(uio_res->path, O_RDWR);
+			if (fd < 0) {
+				RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
+					uio_res->path, strerror(errno));
+				rte_free(uio_res);
+				return -1;
+			}
+
+			if (maps[j].addr != NULL
+					|| (mapaddr = pci_map_resource(NULL, fd,
+							(off_t) offset, (size_t) maps[j].size)) == NULL) {
+				rte_free(uio_res);
+				close(fd);
+				return (-1);
+			}
+			close(fd);
+
+			maps[j].addr = mapaddr;
+			maps[j].offset = offset;
+			dev->mem_resource[i].addr = mapaddr;
+		}
+	}
+
+	TAILQ_INSERT_TAIL(pci_res_list, uio_res, next);
+
+	return (0);
+}
+
+/*
+ * parse a sysfs file containing one integer value
+ * different to the eal version, as it needs to work with 64-bit values
+ */
+static int
+pci_parse_sysfs_value(const char *filename, uint64_t *val) {
+	FILE *f;
+	char buf[BUFSIZ];
+	char *end = NULL;
+
+	f = fopen(filename, "r");
+	if (f == NULL) {
+		RTE_LOG(ERR, EAL,
+				"%s(): cannot open sysfs value %s\n", __func__, filename);
+		return -1;
+	}
+
+	if (fgets(buf, sizeof(buf), f) == NULL) {
+		RTE_LOG(ERR, EAL,
+				"%s(): cannot read sysfs value %s\n", __func__, filename);
+		fclose(f);
+		return -1;
+	}
+	*val = strtoull(buf, &end, 0);
+	if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
+		RTE_LOG(ERR, EAL,
+				"%s(): cannot parse sysfs value %s\n", __func__, filename);
+		fclose(f);
+		return -1;
+	}
+	fclose(f);
+	return 0;
+}
diff --git a/lib/librte_eal/linuxapp/eal/include/eal_pci_init.h b/lib/librte_eal/linuxapp/eal/include/eal_pci_init.h
new file mode 100644
index 0000000..699e80d
--- /dev/null
+++ b/lib/librte_eal/linuxapp/eal/include/eal_pci_init.h
@@ -0,0 +1,65 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef EAL_PCI_INIT_H_
+#define EAL_PCI_INIT_H_
+
+struct pci_map {
+	void *addr;
+	uint64_t offset;
+	uint64_t size;
+	uint64_t phaddr;
+};
+
+/*
+ * For multi-process we need to reproduce all PCI mappings in secondary
+ * processes, so save them in a tailq.
+ */
+struct mapped_pci_resource {
+	TAILQ_ENTRY(mapped_pci_resource) next;
+
+	struct rte_pci_addr pci_addr;
+	char path[PATH_MAX];
+	int nb_maps;
+	struct pci_map maps[PCI_MAX_RESOURCE];
+};
+
+TAILQ_HEAD(mapped_pci_res_list, mapped_pci_resource);
+struct mapped_pci_res_list *pci_res_list;
+
+void * pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size);
+
+/* map IGB_UIO resource prototype */
+int pci_uio_map_resource(struct rte_pci_device *dev);
+
+#endif /* EAL_PCI_INIT_H_ */
-- 
1.7.0.7