1 files changed, 440 insertions, 0 deletions

diff --git a/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_pci_uio.c b/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_pci_uio.c
new file mode 100755
index 00000000..e53f06b8
--- /dev/null
+++ b/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_pci_uio.c
@@ -0,0 +1,440 @@
+/*-
+ *   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 <sys/mman.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);
+
+void *pci_map_addr = NULL;
+
+
+#define OFF_MAX              ((uint64_t)(off_t)-1)
+static int
+pci_uio_get_mappings(const char *devname, struct pci_map maps[], int nb_maps)
+{
+	int 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 */
+		snprintf(dirname, sizeof(dirname),
+			"%s/maps/map%u", devname, i);
+
+		if (access(dirname, F_OK) != 0)
+			break;
+
+		/* get mapping offset */
+		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 */
+		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 */
+		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 */
+	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" */
+	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 */
+
+	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 */
+		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)) {
+			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)) {
+			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;
+	int 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;
+	}
+	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*/
+	uio_res = rte_zmalloc("UIO_RES", sizeof(*uio_res), 0);
+	if (uio_res == NULL) {
+		RTE_LOG(ERR, EAL,
+			"%s(): cannot store uio mmap details\n", __func__);
+		return -1;
+	}
+
+	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 */
+		phaddr = dev->mem_resource[i].phys_addr;
+		if (phaddr == 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) {
+			int fail = 0;
+			offset = j * pagesz;
+
+			/*
+			 * 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));
+				return -1;
+			}
+
+			if (maps[j].addr != NULL)
+				fail = 1;
+			else {
+				/* try mapping somewhere close to the end of hugepages */
+				if (pci_map_addr == NULL)
+					pci_map_addr = pci_find_max_end_va();
+
+				mapaddr = pci_map_resource(pci_map_addr, fd, (off_t)offset,
+						(size_t)maps[j].size);
+				if (mapaddr == MAP_FAILED)
+					fail = 1;
+
+				pci_map_addr = RTE_PTR_ADD(mapaddr, (size_t) maps[j].size);
+			}
+
+			if (fail) {
+				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;
+}