Expand the existing netconsole selftest to verify the functionality of
the recently added CPU number auto-population feature in the netconsole
userdata.

The changes include enabling the "populate_cpu_nr" option on the
netconsole target before sending the test data, and validating that the
received data on the listener side contains a "cpu=" entry in the
userdata, indicating that the CPU number was successfully
auto-populated.

This addition to the netconsole selftest ensures that the new CPU number
auto-population feature works as expected and helps catch any
regressions in this functionality.

Signed-off-by: Breno Leitao <[email protected]>
---
 tools/testing/selftests/drivers/net/netcons_basic.sh | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tools/testing/selftests/drivers/net/netcons_basic.sh 
b/tools/testing/selftests/drivers/net/netcons_basic.sh
index 
b175f4d966e5056ddb62e335f212c03e55f50fb0..92538a188f0696b3e54071d1d32c7b2e523db839
 100755
--- a/tools/testing/selftests/drivers/net/netcons_basic.sh
+++ b/tools/testing/selftests/drivers/net/netcons_basic.sh
@@ -153,6 +153,16 @@ function set_user_data() {
        echo "${USERDATA_VALUE}" > "${VALUE_PATH}"
 }
 
+function set_cpu_nr() {
+       if [[ ! -f "${NETCONS_PATH}""/userdata/populate_cpu_nr" ]]
+       then
+               echo "Populate CPU configfs path not available in 
${NETCONS_PATH}/userdata/populate_cpu_nr" >&2
+               exit "${ksft_skip}"
+       fi
+
+       echo 1 > "${NETCONS_PATH}""/userdata/populate_cpu_nr"
+}
+
 function listen_port_and_save_to() {
        local OUTPUT=${1}
        # Just wait for 2 seconds
@@ -185,6 +195,12 @@ function validate_result() {
                exit "${ksft_fail}"
        fi
 
+       if ! grep -q "cpu=[0-9]\+" "${TMPFILENAME}"; then
+               echo "FAIL: 'cpu=' not found in ${TMPFILENAME}" >&2
+               cat "${TMPFILENAME}" >&2
+               exit "${ksft_fail}"
+       fi
+
        # Delete the file once it is validated, otherwise keep it
        # for debugging purposes
        rm "${TMPFILENAME}"
@@ -254,6 +270,8 @@ set_network
 create_dynamic_target
 # Set userdata "key" with the "value" value
 set_user_data
+# Auto populate CPU number
+set_cpu_nr
 # Listed for netconsole port inside the namespace and destination interface
 listen_port_and_save_to "${OUTPUT_FILE}" &
 # Wait for socat to start and listen to the port.

-- 
2.43.5


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