[ovs-dev] [PATCH] netdev: Set the default number of queues at removal from the database

[Ilya Maximets]

Expected behavior for attribute removal from the database is
resetting it to default value. Currently this doesn't work for
n_rxq/n_txq options of pmd netdevs (last requested value used):

	# ovs-vsctl set interface dpdk0 options:n_rxq=4
	# ovs-vsctl remove interface dpdk0 options n_rxq
	# ovs-appctl dpif/show | grep dpdk0
	  <...>
	  dpdk0 1/1: (dpdk: configured_rx_queues=4, <...> \
	                    requested_rx_queues=4,  <...>)

Fix that by using NR_QUEUE or 1 as a default value for 'smap_get_int'.

Fixes: a14b8947fd13 ("dpif-netdev: Allow different numbers of
                      rx queues for different ports.")
Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
---
 lib/netdev-dpdk.c  | 2 +-
 lib/netdev-dummy.c | 4 ++--
 tests/pmd.at       | 7 +++++++
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index 61d7aa3..625f425 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -1084,7 +1084,7 @@ dpdk_set_rxq_config(struct netdev_dpdk *dev, const struct smap *args)
 {
     int new_n_rxq;
 
-    new_n_rxq = MAX(smap_get_int(args, "n_rxq", dev->requested_n_rxq), 1);
+    new_n_rxq = MAX(smap_get_int(args, "n_rxq", NR_QUEUE), 1);
     if (new_n_rxq != dev->requested_n_rxq) {
         dev->requested_n_rxq = new_n_rxq;
         netdev_request_reconfigure(&dev->up);
diff --git a/lib/netdev-dummy.c b/lib/netdev-dummy.c
index dec1a8e..de74846 100644
--- a/lib/netdev-dummy.c
+++ b/lib/netdev-dummy.c
@@ -868,8 +868,8 @@ netdev_dummy_set_config(struct netdev *netdev_, const struct smap *args)
         goto exit;
     }
 
-    new_n_rxq = MAX(smap_get_int(args, "n_rxq", netdev->requested_n_rxq), 1);
-    new_n_txq = MAX(smap_get_int(args, "n_txq", netdev->requested_n_txq), 1);
+    new_n_rxq = MAX(smap_get_int(args, "n_rxq", 1), 1);
+    new_n_txq = MAX(smap_get_int(args, "n_txq", 1), 1);
     new_numa_id = smap_get_int(args, "numa_id", 0);
     if (new_n_rxq != netdev->requested_n_rxq
         || new_n_txq != netdev->requested_n_txq
diff --git a/tests/pmd.at b/tests/pmd.at
index 8f05d74..7d3fa0d 100644
--- a/tests/pmd.at
+++ b/tests/pmd.at
@@ -259,6 +259,13 @@ NXT_PACKET_IN2 (xid=0x0): cookie=0x0 total_len=42 in_port=1 (via action) data_le
 icmp,vlan_tci=0x0000,dl_src=50:54:00:00:00:09,dl_dst=50:54:00:00:00:0a,nw_src=10.0.0.2,nw_dst=10.0.0.1,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0 icmp_csum:f7ff
 ])
 
+dnl Check resetting to default number of rx queues after removal from the db.
+AT_CHECK([ovs-vsctl remove interface p1 options n_rxq])
+
+AT_CHECK([ovs-appctl dpif/show | grep p1 | sed 's/\(tx_queues=\)[[0-9]]*/\1<cleared>/g'], [0], [dnl
+		p1 1/1: (dummy-pmd: configured_rx_queues=1, configured_tx_queues=<cleared>, requested_rx_queues=1, requested_tx_queues=<cleared>)
+])
+
 OVS_VSWITCHD_STOP
 AT_CLEANUP
 
-- 
2.7.4