[PATCH V3 blktests 5/5] common/multipath-over-rdma: allow to set use_siw

[Yi Zhang <yi.zhang@redhat.com>]

With this change, we can change to use siw for nvme-rdma/nvmeof-mp/srp
testing from cmdline:

$ use_siw=1 nvme-trtype=rdma ./check nvme/
$ use_siw=1 ./check nvmeof-mp/
$ use_siw=1 ./check srp/

Signed-off-by: Yi Zhang <yi.zhang@redhat.com>
---
 common/multipath-over-rdma | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/multipath-over-rdma b/common/multipath-over-rdma
index ba6fa0d..b12dec3 100644
--- a/common/multipath-over-rdma
+++ b/common/multipath-over-rdma
@@ -12,7 +12,7 @@ filesystem_type=ext4
 fio_aux_path=/tmp/fio-state-files
 memtotal=$(sed -n 's/^MemTotal:[[:blank:]]*\([0-9]*\)[[:blank:]]*kB$/\1/p' /proc/meminfo)
 max_ramdisk_size=$((1<<25))
-use_siw=
+use_siw=${use_siw:-""}
 ramdisk_size=$((memtotal*(1024/16)))  # in bytes
 if [ $ramdisk_size -gt $max_ramdisk_size ]; then
 	ramdisk_size=$max_ramdisk_size
-- 
2.21.0