scsi: hisi_sas: enable use_clustering

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5B468
CVE: NA

------------------------------------------------

Enable "clustering", that is merging of segments so that they might span
more than a single page, and optimized the issue that 520 KB of service
delivery is split.

fio test with --filename=/dev/sdb --bs=520k --iodepth=32

before:
[root@localhost ~]# cat /sys/block/sdb/queue/max_segment_size
4096

[root@localhost ~]#iostat -x
Device ... r_await rareq-sz ... aqu-sz  %util
sdb    ... 29.78   259.89   ... 5.87    9.92

after:
[root@localhost ~]# cat /sys/block/sdb/queue/max_segment_size
65536

[root@localhost ~]#iostat -x
Device ... r_await rareq-sz ... aqu-sz  %util
sdb    ... 29.80   516.03   ... 1.34    4.50
Signed-off-by: NXingui Yang <yangxingui@huawei.com>
Reviewed-by: Nkang fenglong <kangfenglong@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NLaibin Qiu <qiulaibin@huawei.com>

drivers/scsi/hisi_sas/hisi_sas_v1_hw.c

@@ -1783,6 +1783,7 @@ static struct scsi_host_template sht_v1_hw = {
 	.this_id		= -1,
 	.sg_tablesize		= HISI_SAS_SGE_PAGE_CNT,
 	.max_sectors		= SCSI_DEFAULT_MAX_SECTORS,
+	.use_clustering		= ENABLE_CLUSTERING,
 	.eh_device_reset_handler = sas_eh_device_reset_handler,
 	.eh_target_reset_handler = sas_eh_target_reset_handler,
 	.slave_alloc		= sas_slave_alloc,

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

@@ -3600,6 +3600,7 @@ static struct scsi_host_template sht_v2_hw = {
 	.this_id		= -1,
 	.sg_tablesize		= HISI_SAS_SGE_PAGE_CNT,
 	.max_sectors		= SCSI_DEFAULT_MAX_SECTORS,
+	.use_clustering		= ENABLE_CLUSTERING,
 	.eh_device_reset_handler = sas_eh_device_reset_handler,
 	.eh_target_reset_handler = sas_eh_target_reset_handler,
 	.slave_alloc		= sas_slave_alloc,

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -3288,6 +3288,7 @@ static struct scsi_host_template sht_v3_hw = {
 	.sg_tablesize		= HISI_SAS_SGE_PAGE_CNT,
 	.sg_prot_tablesize	= HISI_SAS_SGE_PAGE_CNT,
 	.max_sectors		= SCSI_DEFAULT_MAX_SECTORS,
+	.use_clustering		= ENABLE_CLUSTERING,
 	.eh_device_reset_handler = sas_eh_device_reset_handler,
 	.eh_target_reset_handler = sas_eh_target_reset_handler,
 	.slave_alloc		= sas_slave_alloc,