RDMA/rtrs-clt: Follow "one entry one value" rule for IO migration stats

This commit divides the sysfs entry cpu_migration into 2 different entries
One for "from cpus" and the other for "to cpus".

Link: https://lore.kernel.org/r/20210922125333.351454-8-haris.iqbal@ionos.com
Signed-off-by: Md Haris Iqbal <haris.iqbal@ionos.com>
Reviewed-by: Gioh Kim <gi-oh.kim@ionos.com>
Reviewed-by: Aleksei Marov <aleksei.marov@ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/rtrs/rtrs-clt-stats.c

@@ -37,29 +37,38 @@ void rtrs_clt_inc_failover_cnt(struct rtrs_clt_stats *stats)
 	s->rdma.failover_cnt++;
 }
 
-int rtrs_clt_stats_migration_cnt_to_str(struct rtrs_clt_stats *stats, char *buf)
+int rtrs_clt_stats_migration_from_cnt_to_str(struct rtrs_clt_stats *stats, char *buf)
 {
 	struct rtrs_clt_stats_pcpu *s;
 
 	size_t used;
 	int cpu;
 
-	used = sysfs_emit(buf, "    ");
-	for_each_possible_cpu(cpu)
-		used += sysfs_emit_at(buf, used, " CPU%u", cpu);
-
-	used += sysfs_emit_at(buf, used, "\nfrom:");
+	used = 0;
 	for_each_possible_cpu(cpu) {
 		s = per_cpu_ptr(stats->pcpu_stats, cpu);
-		used += sysfs_emit_at(buf, used, " %d",
+		used += sysfs_emit_at(buf, used, "%d ",
 				  atomic_read(&s->cpu_migr.from));
 	}
 
-	used += sysfs_emit_at(buf, used, "\nto  :");
+	used += sysfs_emit_at(buf, used, "\n");
+
+	return used;
+}
+
+int rtrs_clt_stats_migration_to_cnt_to_str(struct rtrs_clt_stats *stats, char *buf)
+{
+	struct rtrs_clt_stats_pcpu *s;
+
+	size_t used;
+	int cpu;
+
+	used = 0;
 	for_each_possible_cpu(cpu) {
 		s = per_cpu_ptr(stats->pcpu_stats, cpu);
-		used += sysfs_emit_at(buf, used, " %d", s->cpu_migr.to);
+		used += sysfs_emit_at(buf, used, "%d ", s->cpu_migr.to);
 	}
+
 	used += sysfs_emit_at(buf, used, "\n");
 
 	return used;

drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c

@@ -296,8 +296,12 @@ static struct kobj_attribute rtrs_clt_remove_path_attr =
 	__ATTR(remove_path, 0644, rtrs_clt_remove_path_show,
 	       rtrs_clt_remove_path_store);
 
-STAT_ATTR(struct rtrs_clt_stats, cpu_migration,
-	  rtrs_clt_stats_migration_cnt_to_str,
+STAT_ATTR(struct rtrs_clt_stats, cpu_migration_from,
+	  rtrs_clt_stats_migration_from_cnt_to_str,
+	  rtrs_clt_reset_cpu_migr_stats);
+
+STAT_ATTR(struct rtrs_clt_stats, cpu_migration_to,
+	  rtrs_clt_stats_migration_to_cnt_to_str,
 	  rtrs_clt_reset_cpu_migr_stats);
 
 STAT_ATTR(struct rtrs_clt_stats, reconnects,
@@ -313,7 +317,8 @@ STAT_ATTR(struct rtrs_clt_stats, reset_all,
 	  rtrs_clt_reset_all_stats);
 
 static struct attribute *rtrs_clt_stats_attrs[] = {
-	&cpu_migration_attr.attr,
+	&cpu_migration_from_attr.attr,
+	&cpu_migration_to_attr.attr,
 	&reconnects_attr.attr,
 	&rdma_attr.attr,
 	&reset_all_attr.attr,

drivers/infiniband/ulp/rtrs/rtrs-clt.h

@@ -226,7 +226,8 @@ int rtrs_clt_reset_rdma_lat_distr_stats(struct rtrs_clt_stats *stats,
 ssize_t rtrs_clt_stats_rdma_lat_distr_to_str(struct rtrs_clt_stats *stats,
 					      char *page);
 int rtrs_clt_reset_cpu_migr_stats(struct rtrs_clt_stats *stats, bool enable);
-int rtrs_clt_stats_migration_cnt_to_str(struct rtrs_clt_stats *stats, char *buf);
+int rtrs_clt_stats_migration_from_cnt_to_str(struct rtrs_clt_stats *stats, char *buf);
+int rtrs_clt_stats_migration_to_cnt_to_str(struct rtrs_clt_stats *stats, char *buf);
 int rtrs_clt_reset_reconnects_stat(struct rtrs_clt_stats *stats, bool enable);
 int rtrs_clt_stats_reconnects_to_str(struct rtrs_clt_stats *stats, char *buf);
 int rtrs_clt_reset_rdma_stats(struct rtrs_clt_stats *stats, bool enable);