Add statistics ring buffer analyze tool

This tool prints the statistic ring buffer.

1 files changed, 335 insertions, 0 deletions

diff --git a/tools/stats-ringbuffer-dump.c b/tools/stats-ringbuffer-dump.c
new file mode 100644
index 00000000..b1bd7134
--- /dev/null
+++ b/tools/stats-ringbuffer-dump.c
@@ -0,0 +1,335 @@
+/*
+ *
+ *  Connection Manager
+ *
+ *  Copyright (C) 2010  BMW Car IT GmbH. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _GNU_SOURCE
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <sys/time.h>
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#define MAGIC 0xFA00B915
+
+struct connman_stats_data {
+	unsigned int rx_packets;
+	unsigned int tx_packets;
+	unsigned int rx_bytes;
+	unsigned int tx_bytes;
+	unsigned int rx_errors;
+	unsigned int tx_errors;
+	unsigned int rx_dropped;
+	unsigned int tx_dropped;
+	unsigned int time;
+};
+
+struct stats_file_header {
+	unsigned int magic;
+	unsigned int begin;
+	unsigned int end;
+};
+
+struct stats_record {
+	time_t ts;
+	struct connman_stats_data data;
+};
+
+struct stats_file {
+	int fd;
+	char *name;
+	char *addr;
+	size_t len;
+
+	/* cached values */
+	int max_nr;
+	int nr;
+	struct stats_record *first;
+	struct stats_record *last;
+};
+
+static struct stats_file_header *get_hdr(struct stats_file *file)
+{
+	return (struct stats_file_header *)file->addr;
+}
+
+static struct stats_record *get_begin(struct stats_file *file)
+{
+	unsigned int off = get_hdr(file)->begin;
+
+	return (struct stats_record *)(file->addr + off);
+}
+
+static struct stats_record *get_end(struct stats_file *file)
+{
+	unsigned int off = get_hdr(file)->end;
+
+	return (struct stats_record *)(file->addr + off);
+}
+
+static struct stats_record *get_next(struct stats_file *file,
+					struct stats_record *cur)
+{
+	cur++;
+
+	if (cur > file->last)
+		cur = file->first;
+
+	return cur;
+}
+
+static int get_index(struct stats_file *file, struct stats_record *rec)
+{
+	return rec - file->first;
+}
+
+static void stats_print_record(struct stats_record *rec)
+{
+	char buffer[30];
+
+	strftime(buffer, 30, "%d-%m-%Y %T", localtime(&rec->ts));
+	printf("%p %s %d %d %d %d %d %d %d %d %d\n", rec, buffer,
+		rec->data.rx_packets,
+		rec->data.tx_packets,
+		rec->data.tx_bytes,
+		rec->data.tx_bytes,
+		rec->data.rx_errors,
+		rec->data.tx_errors,
+		rec->data.rx_dropped,
+		rec->data.tx_dropped,
+		rec->data.time);
+}
+
+static void stats_hdr_info(struct stats_file *file)
+{
+	struct stats_file_header *hdr;
+	struct stats_record *begin, *end;
+
+	hdr = get_hdr(file);
+	begin = get_begin(file);
+	end = get_end(file);
+
+	printf("Data Structure Sizes\n");
+	printf("  sizeof header   %zd/0x%02zx\n",
+		sizeof(struct stats_file_header),
+		sizeof(struct stats_file_header));
+	printf("  sizeof entry    %zd/0%02zx\n\n",
+		sizeof(struct stats_record),
+		sizeof(struct stats_record));
+
+	printf("File\n");
+	printf("  addr            %p\n",  file->addr);
+	printf("  len             %zd\n", file->len);
+
+	printf("  max nr entries  %d\n", file->max_nr);
+	printf("  nr entries      %d\n\n", file->nr);
+
+	printf("Header\n");
+	printf("  magic           0x%08x\n", hdr->magic);
+	printf("  begin           [%d] 0x%08x\n",
+		get_index(file, begin), hdr->begin);
+	printf("  end             [%d] 0x%08x\n\n",
+		get_index(file, end), hdr->end);
+
+	printf("Pointers\n");
+	printf("  hdr             %p\n", hdr);
+	printf("  begin           %p\n", begin);
+	printf("  end             %p\n", end);
+	printf("  first           %p\n", file->first);
+	printf("  last            %p\n\n", file->last);
+}
+
+static void stats_print_entries(struct stats_file *file)
+{
+	struct stats_record *it;
+	int i;
+
+	printf("[ idx] ptr ts rx_packets tx_packets rx_bytes "
+		"tx_bytes rx_errors tx_errors rx_dropped tx_dropped time\n\n");
+
+	for (i = 0, it = file->first; it <= file->last; it++, i++) {
+		printf("[%04d] ", i);
+		stats_print_record(it);
+	}
+}
+
+static void stats_print_diff(struct stats_file *file)
+{
+	struct stats_record *begin, *end;
+
+	begin = get_begin(file);
+	begin = get_next(file, begin);
+	end = get_end(file);
+
+	printf("\n(begin + 1)\n");
+	printf("\t[%04d] ", get_index(file, begin));
+	stats_print_record(begin);
+	printf("end\n");
+	printf("\t[%04d] ", get_index(file, end));
+	stats_print_record(end);
+
+	printf("\nend - (begin + 1):\n");
+	printf("\trx_packets: %d\n",
+		end->data.rx_packets - begin->data.rx_packets);
+	printf("\ttx_packets: %d\n",
+		end->data.tx_packets - begin->data.tx_packets);
+	printf("\trx_bytes:   %d\n",
+		end->data.rx_bytes - begin->data.rx_bytes);
+	printf("\ttx_bytes:   %d\n",
+		end->data.tx_bytes - begin->data.tx_bytes);
+	printf("\trx_errors:  %d\n",
+		end->data.rx_errors - begin->data.rx_errors);
+	printf("\ttx_errors:  %d\n",
+		end->data.tx_errors - begin->data.tx_errors);
+	printf("\trx_dropped: %d\n",
+		end->data.rx_dropped - begin->data.rx_dropped);
+	printf("\ttx_dropped: %d\n",
+		end->data.tx_dropped - begin->data.tx_dropped);
+	printf("\ttime:       %d\n",
+		end->data.time - begin->data.time);
+}
+
+static void update_max_nr_entries(struct stats_file *file)
+{
+	file->max_nr = (file->len - sizeof(struct stats_file_header)) /
+		sizeof(struct stats_record);
+}
+
+static void update_nr_entries(struct stats_file *file)
+{
+	struct stats_record *begin, *end;
+	int nr;
+
+	begin = get_begin(file);
+	end = get_end(file);
+
+	nr = get_index(file, end) - get_index(file, begin);
+
+	if (nr < 0)
+		nr += file->max_nr;
+
+	file->nr = nr;
+}
+
+static void update_first(struct stats_file *file)
+{
+	file->first = (struct stats_record *)(file->addr +
+					sizeof(struct stats_file_header));
+}
+
+static void update_last(struct stats_file *file)
+{
+	struct stats_record *last;
+
+	last = file->first;
+	last += file->max_nr - 1;
+
+	file->last = last;
+}
+
+static int stats_file_update_cache(struct stats_file *file)
+{
+	update_max_nr_entries(file);
+	update_nr_entries(file);
+	update_first(file);
+	update_last(file);
+
+	return 0;
+}
+
+static int stats_file_mmap(struct stats_file *file, size_t size)
+{
+	size_t page_size;
+
+	page_size = sysconf(_SC_PAGESIZE);
+	file->len = (size + page_size - 1) & ~(page_size - 1);
+
+	file->addr = mmap(NULL, file->len, PROT_READ,
+			MAP_SHARED, file->fd, 0);
+
+	if (file->addr == MAP_FAILED) {
+		fprintf(stderr, "mmap error %s for %s\n",
+			strerror(errno), file->name);
+		return -errno;
+	}
+
+	stats_file_update_cache(file);
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	struct stats_file _file, *file;
+	struct stat stat;
+	int err;
+
+	if (argc < 2) {
+		printf("Usage: %s [STATS_FILENAME]\n", argv[0]);
+		exit(0);
+	}
+
+	file = &_file;
+	bzero(file, sizeof(struct stats_file));
+
+	file->name = argv[1];
+
+	file->fd = open(file->name, O_RDONLY, 0644);
+	if (file->fd == -1) {
+		fprintf(stderr, "open error %s for %s\n",
+			strerror(errno), file->name);
+		exit(1);
+	}
+
+	err = fstat(file->fd, &stat);
+	if (err < 0) {
+		fprintf(stderr, "fstat error %s for %s\n",
+			strerror(errno), file->name);
+		exit(1);
+	}
+
+	err = stats_file_mmap(file, stat.st_size);
+	if (err < 0)
+		exit(1);
+
+	if (get_hdr(file)->magic != MAGIC) {
+		/* not fatal */
+		printf("No valid magic found\n");
+	}
+
+	stats_hdr_info(file);
+	stats_print_entries(file);
+	stats_print_diff(file);
+
+	munmap(file->addr, file->len);
+	close(file->fd);
+
+	return 0;
+}