selftests: mptcp: connect: print pcap prefix

To be able to find which capture files have been produced after several
runs.

This prefix was not printed anywhere before.

While at it, always use the same prefix by taking info from ns1, instead
of "$connector_ns", which is sometimes ns1, sometimes ns2 in the
subtests.

Reviewed-by: Mat Martineau <martineau@kernel.org>
Reviewed-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20250912-net-mptcp-fix-sft-connect-v1-5-d40e77cbbf02@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index c2ab9f7f0d2133559bb18ce884b613d21d1ec5f0..47ecb5b3836eb5c64787bda0f6f1cc7c3af338aa 100755 (executable)
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -211,6 +211,11 @@ if $checksum; then
        done
 fi
 
+if $capture; then
+       rndh="${ns1:4}"
+       mptcp_lib_pr_info "Packet capture files will have this prefix: ${rndh}-"
+fi
+
 set_ethtool_flags() {
        local ns="$1"
        local dev="$2"
@@ -361,7 +366,6 @@ do_transfer()
 
        if $capture; then
                local capuser
-               local rndh="${connector_ns:4}"
                if [ -z $SUDO_USER ] ; then
                        capuser=""
                else