selftests: rds: Fix stale log clean up

Since rds self tests no longer has a default folder, users must
specify a log collection folder if they want to collect logs.
Currently the log folder is deleted and recreated, but this can
be dangerous if the user exports RDS_LOG_DIR=/tmp or /var/log.
This patch corrects the clean up to delete only rds log artifacts
from the log folder, and further prefixes rds specific logs as rds*

Signed-off-by: Allison Henderson <achender@kernel.org>
Link: https://patch.msgid.link/20260507233213.556182-2-achender@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/rds/run.sh

@@ -189,17 +189,21 @@ check_gcov_conf
 
 TRACE_CMD=()
 if [[ -n "$LOG_DIR" ]]; then
-   rm -fr "$LOG_DIR"
    FLAGS+=("-d" "$LOG_DIR")
 
    TRACE_FILE="${LOG_DIR}/rds-strace.txt"
    COVR_DIR="${LOG_DIR}/coverage/"
+   DMESG_FILE="${LOG_DIR}/rds-dmesg.out"
+
    mkdir -p  "$LOG_DIR"
    mkdir -p "$COVR_DIR"
 
-   echo "#Traces will be logged to ${TRACE_FILE}"
    rm -f "$TRACE_FILE"
+   rm -f "$DMESG_FILE"
+   rm -f "$LOG_DIR"/rds-*.pcap
+   rm -f "$COVR_DIR"/gcovr*
 
+   echo "# Traces will be logged to ${TRACE_FILE}"
    TRACE_CMD=(strace -T -tt -o "${TRACE_FILE}")
 fi
 
@@ -210,7 +214,7 @@ echo "#running RDS tests..."
 test_rc=$?
 
 if [[ -n "$LOG_DIR" ]]; then
-   dmesg > "${LOG_DIR}/dmesg.out"
+   dmesg > "${DMESG_FILE}"
 fi
 
 if [[ -n "$LOG_DIR" ]] && [ "$GENERATE_GCOV_REPORT" -eq 1 ]; then

tools/testing/selftests/net/rds/test.py

@@ -151,7 +151,7 @@ tcpdump_procs = []
 # Start a packet capture on each network
 if logdir is not None:
     for net in [NET0, NET1]:
-        pcap = logdir+'/'+net+'.pcap'
+        pcap = logdir+'/rds-'+net+'.pcap'
 
         tcpdump_cmd = ['ip', 'netns', 'exec', net, '/usr/sbin/tcpdump']
         sudo_user = os.environ.get('SUDO_USER')