selftests/rdma: explicitly skip tests when required modules are missing

Currently, the rdma rxe selftests fail with an exit code of 1 when
required kernel modules are not present. This causes spurious failures
in environments where these modules might not be compiled or available.

Include the standard kselftest 'ktap_helpers.sh' and replace the
hardcoded error exits with '$KSFT_SKIP'. This ensures the tests are
properly marked as skipped rather than failed.

Fixes: e01027cab3 ("RDMA/rxe: Add testcase for net namespace rxe")
Signed-off-by: Yi Lai <yi1.lai@intel.com>
Link: https://patch.msgid.link/20260507125106.3114167-1-yi1.lai@intel.com
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

tools/testing/selftests/rdma/rxe_ipv6.sh

@@ -8,6 +8,8 @@ RXE_NAME="rxe6"
 PORT=4791
 IP6_ADDR="2001:db8::1/64"
 
+source "$(dirname "$0")/../kselftest/ktap_helpers.sh"
+
 exec > /dev/null
 
 # Cleanup function to run on exit (even on failure)
@@ -21,8 +23,8 @@ trap cleanup EXIT
 # 1. Prerequisites check
 for mod in tun veth rdma_rxe; do
     if ! modinfo "$mod" >/dev/null 2>&1; then
-        echo "Error: Kernel module '$mod' not found."
-        exit 1
+        echo "SKIP: Kernel module '$mod' not found." >&2
+        exit $KSFT_SKIP
     fi
 done
 

tools/testing/selftests/rdma/rxe_rping_between_netns.sh

@@ -8,6 +8,8 @@ IP_A="1.1.1.1"
 IP_B="1.1.1.2"
 PORT=4791
 
+source "$(dirname "$0")/../kselftest/ktap_helpers.sh"
+
 exec > /dev/null
 
 # --- Cleanup Routine ---
@@ -27,6 +29,11 @@ if [[ $EUID -ne 0 ]]; then
    exit 1
 fi
 
+if ! modinfo rdma_rxe >/dev/null 2>&1; then
+    echo "SKIP: Kernel module 'rdma_rxe' not found." >&2
+    exit $KSFT_SKIP
+fi
+
 modprobe rdma_rxe || { echo "Failed to load rdma_rxe"; exit 1; }
 
 # --- Setup Network Topology ---

tools/testing/selftests/rdma/rxe_socket_with_netns.sh

@@ -4,6 +4,8 @@
 PORT=4791
 MODS=("tun" "rdma_rxe")
 
+source "$(dirname "$0")/../kselftest/ktap_helpers.sh"
+
 exec > /dev/null
 
 # --- Helper: Cleanup Routine ---
@@ -26,6 +28,10 @@ if [[ $EUID -ne 0 ]]; then
 fi
 
 for m in "${MODS[@]}"; do
+    if ! modinfo "$m" >/dev/null 2>&1; then
+        echo "SKIP: Kernel module '$m' not found." >&2
+        exit $KSFT_SKIP
+    fi
     modprobe "$m" || { echo "Error: Failed to load $m"; exit 1; }
 done
 

tools/testing/selftests/rdma/rxe_test_NETDEV_UNREGISTER.sh

@@ -5,6 +5,8 @@ DEV_NAME="tun0"
 RXE_NAME="rxe0"
 RDMA_PORT=4791
 
+source "$(dirname "$0")/../kselftest/ktap_helpers.sh"
+
 exec > /dev/null
 
 # --- Cleanup Routine ---
@@ -19,8 +21,8 @@ trap cleanup EXIT
 
 # 1. Dependency Check
 if ! modinfo rdma_rxe >/dev/null 2>&1; then
-    echo "Error: rdma_rxe module not found."
-    exit 1
+    echo "SKIP: rdma_rxe module not found." >&2
+    exit $KSFT_SKIP
 fi
 
 modprobe rdma_rxe