Merge branch 'master' into dan_stateless

1 files changed, 365 insertions, 0 deletions

diff --git a/src/dpdk22/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c b/src/dpdk22/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
new file mode 100644
index 00000000..18858e2d
--- /dev/null
+++ b/src/dpdk22/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
@@ -0,0 +1,365 @@
+/*-
+ *   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 <sys/types.h>
+#include <sys/file.h>
+#include <dirent.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <fnmatch.h>
+#include <inttypes.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/queue.h>
+
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_eal.h>
+#include <rte_launch.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_debug.h>
+#include <rte_log.h>
+#include <rte_common.h>
+#include "rte_string_fns.h"
+#include "eal_internal_cfg.h"
+#include "eal_hugepages.h"
+#include "eal_filesystem.h"
+
+static const char sys_dir_path[] = "/sys/kernel/mm/hugepages";
+
+/* this function is only called from eal_hugepage_info_init which itself
+ * is only called from a primary process */
+static uint32_t
+get_num_hugepages(const char *subdir)
+{
+	char path[PATH_MAX];
+	long unsigned resv_pages, num_pages = 0;
+	const char *nr_hp_file = "free_hugepages";
+	const char *nr_rsvd_file = "resv_hugepages";
+
+	/* first, check how many reserved pages kernel reports */
+	snprintf(path, sizeof(path), "%s/%s/%s",
+			sys_dir_path, subdir, nr_rsvd_file);
+	if (eal_parse_sysfs_value(path, &resv_pages) < 0)
+		return 0;
+
+	snprintf(path, sizeof(path), "%s/%s/%s",
+			sys_dir_path, subdir, nr_hp_file);
+	if (eal_parse_sysfs_value(path, &num_pages) < 0)
+		return 0;
+
+	if (num_pages == 0)
+		RTE_LOG(WARNING, EAL, "No free hugepages reported in %s\n",
+				subdir);
+
+	/* adjust num_pages */
+	if (num_pages >= resv_pages)
+		num_pages -= resv_pages;
+	else if (resv_pages)
+		num_pages = 0;
+
+	/* we want to return a uint32_t and more than this looks suspicious
+	 * anyway ... */
+	if (num_pages > UINT32_MAX)
+		num_pages = UINT32_MAX;
+
+	return num_pages;
+}
+
+static uint64_t
+get_default_hp_size(void)
+{
+	const char proc_meminfo[] = "/proc/meminfo";
+	const char str_hugepagesz[] = "Hugepagesize:";
+	unsigned hugepagesz_len = sizeof(str_hugepagesz) - 1;
+	char buffer[256];
+	unsigned long long size = 0;
+
+	FILE *fd = fopen(proc_meminfo, "r");
+	if (fd == NULL)
+		rte_panic("Cannot open %s\n", proc_meminfo);
+	while(fgets(buffer, sizeof(buffer), fd)){
+		if (strncmp(buffer, str_hugepagesz, hugepagesz_len) == 0){
+			size = rte_str_to_size(&buffer[hugepagesz_len]);
+			break;
+		}
+	}
+	fclose(fd);
+	if (size == 0)
+		rte_panic("Cannot get default hugepage size from %s\n", proc_meminfo);
+	return size;
+}
+
+static const char *
+get_hugepage_dir(uint64_t hugepage_sz)
+{
+	enum proc_mount_fieldnames {
+		DEVICE = 0,
+		MOUNTPT,
+		FSTYPE,
+		OPTIONS,
+		_FIELDNAME_MAX
+	};
+	static uint64_t default_size = 0;
+	const char proc_mounts[] = "/proc/mounts";
+	const char hugetlbfs_str[] = "hugetlbfs";
+	const size_t htlbfs_str_len = sizeof(hugetlbfs_str) - 1;
+	const char pagesize_opt[] = "pagesize=";
+	const size_t pagesize_opt_len = sizeof(pagesize_opt) - 1;
+	const char split_tok = ' ';
+	char *splitstr[_FIELDNAME_MAX];
+	char buf[BUFSIZ];
+	char *retval = NULL;
+
+	FILE *fd = fopen(proc_mounts, "r");
+	if (fd == NULL)
+		rte_panic("Cannot open %s\n", proc_mounts);
+
+	if (default_size == 0)
+		default_size = get_default_hp_size();
+
+	while (fgets(buf, sizeof(buf), fd)){
+		if (rte_strsplit(buf, sizeof(buf), splitstr, _FIELDNAME_MAX,
+				split_tok) != _FIELDNAME_MAX) {
+			RTE_LOG(ERR, EAL, "Error parsing %s\n", proc_mounts);
+			break; /* return NULL */
+		}
+
+		/* we have a specified --huge-dir option, only examine that dir */
+		if (internal_config.hugepage_dir != NULL &&
+				strcmp(splitstr[MOUNTPT], internal_config.hugepage_dir) != 0)
+			continue;
+
+		if (strncmp(splitstr[FSTYPE], hugetlbfs_str, htlbfs_str_len) == 0){
+			const char *pagesz_str = strstr(splitstr[OPTIONS], pagesize_opt);
+
+			/* if no explicit page size, the default page size is compared */
+			if (pagesz_str == NULL){
+				if (hugepage_sz == default_size){
+					retval = strdup(splitstr[MOUNTPT]);
+					break;
+				}
+			}
+			/* there is an explicit page size, so check it */
+			else {
+				uint64_t pagesz = rte_str_to_size(&pagesz_str[pagesize_opt_len]);
+				if (pagesz == hugepage_sz) {
+					retval = strdup(splitstr[MOUNTPT]);
+					break;
+				}
+			}
+		} /* end if strncmp hugetlbfs */
+	} /* end while fgets */
+
+	fclose(fd);
+	return retval;
+}
+
+/*
+ * Clear the hugepage directory of whatever hugepage files
+ * there are. Checks if the file is locked (i.e.
+ * if it's in use by another DPDK process).
+ */
+static int
+clear_hugedir(const char * hugedir)
+{
+	DIR *dir;
+	struct dirent *dirent;
+	int dir_fd, fd, lck_result;
+	const char filter[] = "*map_*"; /* matches hugepage files */
+
+	/* open directory */
+	dir = opendir(hugedir);
+	if (!dir) {
+		RTE_LOG(ERR, EAL, "Unable to open hugepage directory %s\n",
+				hugedir);
+		goto error;
+	}
+	dir_fd = dirfd(dir);
+
+	dirent = readdir(dir);
+	if (!dirent) {
+		RTE_LOG(ERR, EAL, "Unable to read hugepage directory %s\n",
+				hugedir);
+		goto error;
+	}
+
+	while(dirent != NULL){
+		/* skip files that don't match the hugepage pattern */
+		if (fnmatch(filter, dirent->d_name, 0) > 0) {
+			dirent = readdir(dir);
+			continue;
+		}
+
+		/* try and lock the file */
+		fd = openat(dir_fd, dirent->d_name, O_RDONLY);
+
+		/* skip to next file */
+		if (fd == -1) {
+			dirent = readdir(dir);
+			continue;
+		}
+
+		/* non-blocking lock */
+		lck_result = flock(fd, LOCK_EX | LOCK_NB);
+
+		/* if lock succeeds, unlock and remove the file */
+		if (lck_result != -1) {
+			flock(fd, LOCK_UN);
+			unlinkat(dir_fd, dirent->d_name, 0);
+		}
+		close (fd);
+		dirent = readdir(dir);
+	}
+
+	closedir(dir);
+	return 0;
+
+error:
+	if (dir)
+		closedir(dir);
+
+	RTE_LOG(ERR, EAL, "Error while clearing hugepage dir: %s\n",
+		strerror(errno));
+
+	return -1;
+}
+
+static int
+compare_hpi(const void *a, const void *b)
+{
+	const struct hugepage_info *hpi_a = a;
+	const struct hugepage_info *hpi_b = b;
+
+	return hpi_b->hugepage_sz - hpi_a->hugepage_sz;
+}
+
+/*
+ * when we initialize the hugepage info, everything goes
+ * to socket 0 by default. it will later get sorted by memory
+ * initialization procedure.
+ */
+int
+eal_hugepage_info_init(void)
+{
+	const char dirent_start_text[] = "hugepages-";
+	const size_t dirent_start_len = sizeof(dirent_start_text) - 1;
+	unsigned i, num_sizes = 0;
+	DIR *dir;
+	struct dirent *dirent;
+
+	dir = opendir(sys_dir_path);
+	if (dir == NULL)
+		rte_panic("Cannot open directory %s to read system hugepage "
+			  "info\n", sys_dir_path);
+
+	for (dirent = readdir(dir); dirent != NULL; dirent = readdir(dir)) {
+		struct hugepage_info *hpi;
+
+		if (strncmp(dirent->d_name, dirent_start_text,
+			    dirent_start_len) != 0)
+			continue;
+
+		if (num_sizes >= MAX_HUGEPAGE_SIZES)
+			break;
+
+		hpi = &internal_config.hugepage_info[num_sizes];
+		hpi->hugepage_sz =
+			rte_str_to_size(&dirent->d_name[dirent_start_len]);
+		hpi->hugedir = get_hugepage_dir(hpi->hugepage_sz);
+
+		/* first, check if we have a mountpoint */
+		if (hpi->hugedir == NULL) {
+			uint32_t num_pages;
+
+			num_pages = get_num_hugepages(dirent->d_name);
+			if (num_pages > 0)
+				RTE_LOG(NOTICE, EAL,
+					"%" PRIu32 " hugepages of size "
+					"%" PRIu64 " reserved, but no mounted "
+					"hugetlbfs found for that size\n",
+					num_pages, hpi->hugepage_sz);
+			continue;
+		}
+
+		/* try to obtain a writelock */
+		hpi->lock_descriptor = open(hpi->hugedir, O_RDONLY);
+
+		/* if blocking lock failed */
+		if (flock(hpi->lock_descriptor, LOCK_EX) == -1) {
+			RTE_LOG(CRIT, EAL,
+				"Failed to lock hugepage directory!\n");
+			break;
+		}
+		/* clear out the hugepages dir from unused pages */
+		if (clear_hugedir(hpi->hugedir) == -1)
+			break;
+
+		/* for now, put all pages into socket 0,
+		 * later they will be sorted */
+		hpi->num_pages[0] = get_num_hugepages(dirent->d_name);
+
+#ifndef RTE_ARCH_64
+		/* for 32-bit systems, limit number of hugepages to
+		 * 1GB per page size */
+		hpi->num_pages[0] = RTE_MIN(hpi->num_pages[0],
+					    RTE_PGSIZE_1G / hpi->hugepage_sz);
+#endif
+
+		num_sizes++;
+	}
+	closedir(dir);
+
+	/* something went wrong, and we broke from the for loop above */
+	if (dirent != NULL)
+		return -1;
+
+	internal_config.num_hugepage_sizes = num_sizes;
+
+	/* sort the page directory entries by size, largest to smallest */
+	qsort(&internal_config.hugepage_info[0], num_sizes,
+	      sizeof(internal_config.hugepage_info[0]), compare_hpi);
+
+	/* now we have all info, check we have at least one valid size */
+	for (i = 0; i < num_sizes; i++)
+		if (internal_config.hugepage_info[i].hugedir != NULL &&
+		    internal_config.hugepage_info[i].num_pages[0] > 0)
+			return 0;
+
+	/* no valid hugepage mounts available, return error */
+	return -1;
+}