Author: kp
Date: Mon Jun  1 19:26:16 2020
New Revision: 361701
URL: https://svnweb.freebsd.org/changeset/base/361701

Log:
  bridge tests: Avoid building a switching loop
  
  Enable STP before bringing the bridges up. This avoids a switching loop,
  which has a tendency to drown out progress in userspace processes,
  especially on single-core systems.
  
  Only check that we have indeed shut down one of the looped interfaces
  
  PR:           246448
  Reviewed by:  melifaro
  Differential Revision:        https://reviews.freebsd.org/D25084

Modified:
  head/tests/sys/net/if_bridge_test.sh

Modified: head/tests/sys/net/if_bridge_test.sh
==============================================================================
--- head/tests/sys/net/if_bridge_test.sh        Mon Jun  1 18:58:09 2020        
(r361700)
+++ head/tests/sys/net/if_bridge_test.sh        Mon Jun  1 19:26:16 2020        
(r361701)
@@ -72,7 +72,6 @@ stp_head()
 {
        atf_set descr 'Spanning tree test'
        atf_set require.user root
-       atf_set require.progs jq
 }
 
 stp_body()
@@ -91,13 +90,11 @@ stp_body()
        vnet_mkjail a ${bridge_a} ${epair_one}a ${epair_two}a
        vnet_mkjail b ${bridge_b} ${epair_one}b ${epair_two}b
 
-       jexec a ifconfig ${bridge_a} up
        jexec a ifconfig ${epair_one}a up
        jexec a ifconfig ${epair_two}a up
        jexec a ifconfig ${bridge_a} addm ${epair_one}a
        jexec a ifconfig ${bridge_a} addm ${epair_two}a
 
-       jexec b ifconfig ${bridge_b} up
        jexec b ifconfig ${epair_one}b up
        jexec b ifconfig ${epair_two}b up
        jexec b ifconfig ${bridge_b} addm ${epair_one}b
@@ -105,22 +102,14 @@ stp_body()
 
        jexec a ifconfig ${bridge_a} 192.0.2.1/24
 
-       # Give the interfaces some time to come up and pass some traffic
-       sleep 5
-
-       # Confirm that there's looping traffic
-       nbr=$(jexec a netstat -I ${bridge_a} --libxo json \
-               | jq ".statistics.interface[0].\"received-packets\"")
-       if [ ${nbr} -lt 100 ]
-       then
-               atf_fail "Expected bridging loop, but found very few packets."
-       fi
-
        # Enable spanning tree
        jexec a ifconfig ${bridge_a} stp ${epair_one}a
        jexec a ifconfig ${bridge_a} stp ${epair_two}a
        jexec b ifconfig ${bridge_b} stp ${epair_one}b
        jexec b ifconfig ${bridge_b} stp ${epair_two}b
+
+       jexec b ifconfig ${bridge_b} up
+       jexec a ifconfig ${bridge_a} up
 
        # Give STP time to do its thing
        sleep 5
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