selftests: net: more pmtu.sh fixes

JIRA: https://issues.redhat.com/browse/RHEL-31077
Upstream Status: net.git commit 20622dc

commit 20622dc
Author: Paolo Abeni <pabeni@redhat.com>
Date:   Mon Feb 12 11:19:24 2024 +0100

    selftests: net: more pmtu.sh fixes

    The netdev CI is reporting failures for the pmtu test:

      [  115.929264] br0: port 2(vxlan_a) entered forwarding state
      # 2024/02/08 17:33:22 socat[7871] E bind(7, {AF=10 [0000:0000:0000:0000:0000:0000:0000:0000]:50000}, 28): Address already in use
      # 2024/02/08 17:33:22 socat[7877] E write(7, 0x5598fb6ff000, 8192): Connection refused
      # TEST: IPv6, bridged vxlan4: PMTU exceptions                         [FAIL]
      # File size 0 mismatches exepcted value in locally bridged vxlan test

    The root cause is apparently a socket created by a previous iteration
    of the relevant loop still lasting in LAST_ACK state.

    Note that even the file size check is racy, the receiver process dumping
    the file could still be running in background

    Allow the listener to bound on the same local port via SO_REUSEADDR and
    collect file output file size only after the listener completion.

    Fixes: 136a1b4 ("selftests: net: test vxlan pmtu exceptions with tcp")
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>
    Link: https://lore.kernel.org/r/4f51c11a1ce7ca7a4dabd926cffff63dadac9ba1.1707731086.git.pabeni@redhat.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Hangbin Liu <haliu@redhat.com>

Author: Hangbin Liu

tools/testing/selftests/net/pmtu.sh

@@ -1344,16 +1344,16 @@ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
 		else
 			TCPDST="TCP:[${dst}]:50000"
 		fi
-		${ns_b} socat -T 3 -u -6 TCP-LISTEN:50000 STDOUT > $tmpoutfile &
+		${ns_b} socat -T 3 -u -6 TCP-LISTEN:50000,reuseaddr STDOUT > $tmpoutfile &
 		local socat_pid=$!
 
 		wait_local_port_listen ${NS_B} 50000 tcp
 
 		dd if=/dev/zero status=none bs=1M count=1 | ${target} socat -T 3 -u STDIN $TCPDST,connect-timeout=3
 
+		wait ${socat_pid}
 		size=$(du -sb $tmpoutfile)
 		size=${size%%/tmp/*}
-		wait ${socat_pid}
 
 		[ $size -ne 1048576 ] && err "File size $size mismatches exepcted value in locally bridged vxlan test" && return 1
 	done