3 files changed, 32 insertions, 0 deletions

diff --git a/drivers/scsi/fnic/fnic_debugfs.c b/drivers/scsi/fnic/fnic_debugfs.c
index d6498fabe628..5e3d909cfc53 100644
--- a/drivers/scsi/fnic/fnic_debugfs.c
+++ b/drivers/scsi/fnic/fnic_debugfs.c
@@ -632,6 +632,7 @@ static ssize_t fnic_reset_stats_write(struct file *file,
 			sizeof(struct io_path_stats) - sizeof(u64));
 		memset(fw_stats_p+1, 0,
 			sizeof(struct fw_stats) - sizeof(u64));
+		getnstimeofday(&stats->stats_timestamps.last_reset_time);
 	}
 
 	(*ppos)++;
diff --git a/drivers/scsi/fnic/fnic_stats.h b/drivers/scsi/fnic/fnic_stats.h
index 88c73cccb015..e007feedbf72 100644
--- a/drivers/scsi/fnic/fnic_stats.h
+++ b/drivers/scsi/fnic/fnic_stats.h
@@ -16,6 +16,12 @@
  */
 #ifndef _FNIC_STATS_H_
 #define _FNIC_STATS_H_
+
+struct stats_timestamps {
+	struct timespec last_reset_time;
+	struct timespec last_read_time;
+};
+
 struct io_path_stats {
 	atomic64_t active_ios;
 	atomic64_t max_active_ios;
@@ -110,6 +116,7 @@ struct misc_stats {
 };
 
 struct fnic_stats {
+	struct stats_timestamps stats_timestamps;
 	struct io_path_stats io_stats;
 	struct abort_stats abts_stats;
 	struct terminate_stats term_stats;
diff --git a/drivers/scsi/fnic/fnic_trace.c b/drivers/scsi/fnic/fnic_trace.c
index b5ac5381a0d7..4826f596cb31 100644
--- a/drivers/scsi/fnic/fnic_trace.c
+++ b/drivers/scsi/fnic/fnic_trace.c
@@ -219,7 +219,31 @@ int fnic_get_stats_data(struct stats_debug_info *debug,
 	int buf_size = debug->buf_size;
 	struct timespec val1, val2;
 
+	getnstimeofday(&val1);
 	len = snprintf(debug->debug_buffer + len, buf_size - len,
+		"------------------------------------------\n"
+		 "\t\tTime\n"
+		"------------------------------------------\n");
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		"Current time :          [%ld:%ld]\n"
+		"Last stats reset time:  [%ld:%ld]\n"
+		"Last stats read time:   [%ld:%ld]\n"
+		"delta since last reset: [%ld:%ld]\n"
+		"delta since last read:  [%ld:%ld]\n",
+	val1.tv_sec, val1.tv_nsec,
+	stats->stats_timestamps.last_reset_time.tv_sec,
+	stats->stats_timestamps.last_reset_time.tv_nsec,
+	stats->stats_timestamps.last_read_time.tv_sec,
+	stats->stats_timestamps.last_read_time.tv_nsec,
+	timespec_sub(val1, stats->stats_timestamps.last_reset_time).tv_sec,
+	timespec_sub(val1, stats->stats_timestamps.last_reset_time).tv_nsec,
+	timespec_sub(val1, stats->stats_timestamps.last_read_time).tv_sec,
+	timespec_sub(val1, stats->stats_timestamps.last_read_time).tv_nsec);
+
+	stats->stats_timestamps.last_read_time = val1;
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
 		  "------------------------------------------\n"
 		  "\t\tIO Statistics\n"
 		  "------------------------------------------\n");