[PATCH net-next] selftests: net: Change the indication for iface is up

[Danielle Ratson <danieller@nvidia.com>]

Currently, the indication that an iface is up, is the mark 'state UP' in
the iface info. That situation can be achieved also when the carrier is not
ready, and therefore after the state was found as 'up', it can be still
changed to 'down'.

For example, the below presents a part of a test output with one of the
ifaces involved detailed info and timestamps:

In setup_wait()
45: swp13: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel master
    vswp13 state UP mode DEFAULT group default qlen 1000
    link/ether 7c:fe:90:fc:7d:f1 brd ff:ff:ff:ff:ff:ff promiscuity 0
minmtu 0 maxmtu 65535
    vrf_slave table 1 addrgenmode eui64 numtxqueues 1 numrxqueues 1
gso_max_size 65536 gso_max_segs 65535 portname p13 switchid 7cfe90fc7dc0
17:58:27:242634417

In dst_mac_match_test()
45: swp13: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel
    master vswp13 state DOWN mode DEFAULT group default qlen 1000
    link/ether 7c:fe:90:fc:7d:f1 brd ff:ff:ff:ff:ff:ff promiscuity 0
minmtu 0 maxmtu 65535
    vrf_slave table 1 addrgenmode eui64 numtxqueues 1 numrxqueues 1
gso_max_size 65536 gso_max_segs 65535 portname p13 switchid 7cfe90fc7dc0
17:58:32:254535834
TEST: dst_mac match (skip_hw)					    [FAIL]
        Did not match on correct filter

In src_mac_match_test()
45: swp13: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
    master vswp13 state UP mode DEFAULT group default qlen 1000
    link/ether 7c:fe:90:fc:7d:f1 brd ff:ff:ff:ff:ff:ff promiscuity 0
minmtu 0 maxmtu 65535
    vrf_slave table 1 addrgenmode eui64 numtxqueues 1 numrxqueues 1
gso_max_size 65536 gso_max_segs 65535 portname p13 switchid 7cfe90fc7dc0
17:58:34:446367468
TEST: src_mac match (skip_hw)                                       [ OK ]

In dst_ip_match_test()
45: swp13: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
    master vswp13 state UP mode DEFAULT group default qlen 1000
    link/ether 7c:fe:90:fc:7d:f1 brd ff:ff:ff:ff:ff:ff promiscuity 0
minmtu 0 maxmtu 65535
    vrf_slave table 1 addrgenmode eui64 numtxqueues 1 numrxqueues 1
gso_max_size 65536 gso_max_segs 65535 portname p13 switchid 7cfe90fc7dc0
17:58:35:633518622

In the example, after the setup_prepare() phase, the iface state was
indeed 'UP' so the setup_wait() phase pass successfully. But since
'LOWER_UP' flag was not set yet, the next print, which was right before the
first test case has started, the status turned into 'DOWN'.

While, UP is an indicator that the interface has been enabled and running,
LOWER_UP is a physical layer link flag. It indicates that an Ethernet
cable was plugged in and that the device is connected to the network.

Therefore, the existence of the 'LOWER_UP' flag is necessary for
indicating that the port is up before testing communication.

Change the indication for iface is up to include the existence of
'LOWER_UP'.

Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
---
 tools/testing/selftests/net/forwarding/lib.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 42e28c983d41..a46076b8ebdd 100644
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -399,7 +399,7 @@ setup_wait_dev_with_timeout()
 
 	for ((i = 1; i <= $max_iterations; ++i)); do
 		ip link show dev $dev up \
-			| grep 'state UP' &> /dev/null
+			| grep 'state UP' | grep 'LOWER_UP' &> /dev/null
 		if [[ $? -ne 0 ]]; then
 			sleep 1
 		else
-- 
2.31.1