scsi: fnic: Define stats to track multiqueue (MQ) IOs

Define an array to track IOs for the different queues, print the IO stats
in fnic get stats data.

Reviewed-by: Sesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: Arulprabhu Ponnusamy <arulponn@cisco.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Karan Tilak Kumar <kartilak@cisco.com>
Link: https://lore.kernel.org/r/20231211173617.932990-9-kartilak@cisco.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: Karan Tilak Kumar

drivers/scsi/fnic/fnic_stats.h

@@ -2,6 +2,7 @@
 /* Copyright 2013 Cisco Systems, Inc.  All rights reserved. */
 #ifndef _FNIC_STATS_H_
 #define _FNIC_STATS_H_
+#define FNIC_MQ_MAX_QUEUES 64
 
 struct stats_timestamps {
 	struct timespec64 last_reset_time;
@@ -26,6 +27,7 @@ struct io_path_stats {
 	atomic64_t io_btw_10000_to_30000_msec;
 	atomic64_t io_greater_than_30000_msec;
 	atomic64_t current_max_io_time;
+	atomic64_t ios[FNIC_MQ_MAX_QUEUES];
 };
 
 struct abort_stats {

drivers/scsi/fnic/fnic_trace.c

@@ -204,6 +204,7 @@ int fnic_get_stats_data(struct stats_debug_info *debug,
 	int len = 0;
 	int buf_size = debug->buf_size;
 	struct timespec64 val1, val2;
+	int i = 0;
 
 	ktime_get_real_ts64(&val1);
 	len = scnprintf(debug->debug_buffer + len, buf_size - len,
@@ -266,6 +267,16 @@ int fnic_get_stats_data(struct stats_debug_info *debug,
 		  (u64)atomic64_read(&stats->io_stats.io_btw_10000_to_30000_msec),
 		  (u64)atomic64_read(&stats->io_stats.io_greater_than_30000_msec));
 
+	len += scnprintf(debug->debug_buffer + len, buf_size - len,
+			"------------------------------------------\n"
+			"\t\tIO Queues and cumulative IOs\n"
+			"------------------------------------------\n");
+
+	for (i = 0; i < FNIC_MQ_MAX_QUEUES; i++) {
+		len += scnprintf(debug->debug_buffer + len, buf_size - len,
+				"Q:%d -> %lld\n", i, (u64)atomic64_read(&stats->io_stats.ios[i]));
+	}
+
 	len += scnprintf(debug->debug_buffer + len, buf_size - len,
 		  "\nCurrent Max IO time : %lld\n",
 		  (u64)atomic64_read(&stats->io_stats.current_max_io_time));