Add unregister_netcons_consoles() function to automatically unregister console handlers when no targets of the corresponding type remain active.

The function iterates through the target list to determine which console types (basic vs extended) are still needed, and unregisters any console handlers that are no longer required. This prevents having registered console handlers without corresponding active targets.

The function is called when a target is disabled and moved to the cleanup list, ensuring proper cleanup of unused console registrations.

Signed-off-by: Breno Leitao leitao@debian.org --- drivers/net/netconsole.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 01baa45221b4b..524e717a71e8e 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -460,6 +460,33 @@ static ssize_t sysdata_release_enabled_show(struct config_item *item, return sysfs_emit(buf, "%d\n", release_enabled); }

+/* Iterate in the list of target, and make sure we don't have any console + * register without targets of the same type + */ +static void unregister_netcons_consoles(void) +{ + struct netconsole_target *nt; + u32 console_type_needed = 0; + unsigned long flags; + + spin_lock_irqsave(&target_list_lock, flags); + list_for_each_entry(nt, &target_list, list) { + if (nt->extended) + console_type_needed |= CONS_EXTENDED; + else + console_type_needed |= CONS_BASIC; + } + spin_unlock_irqrestore(&target_list_lock, flags); + + if (!(console_type_needed & CONS_EXTENDED) && + console_is_registered(&netconsole_ext)) + unregister_console(&netconsole_ext); + + if (!(console_type_needed & CONS_BASIC) && + console_is_registered(&netconsole)) + unregister_console(&netconsole); +} + /* * This one is special -- targets created through the configfs interface * are not enabled (and the corresponding netpoll activated) by default. @@ -528,6 +555,10 @@ static ssize_t enabled_store(struct config_item *item, list_move(&nt->list, &target_cleanup_list); spin_unlock_irqrestore(&target_list_lock, flags); mutex_unlock(&target_cleanup_list_lock); + /* Unregister consoles, whose the last target of that type got + * disabled. + */ + unregister_netcons_consoles(); }

ret = strnlen(buf, count);

Extend the netconsole selftest to validate both basic and extended target formats. The basic format is a simpler variant that doesn't support userdata or release functionality.

The test now validates that netconsole works correctly in both configurations, improving test coverage for different netconsole deployment scenarios.

Signed-off-by: Breno Leitao leitao@debian.org --- .../selftests/drivers/net/lib/sh/lib_netcons.sh | 26 +++++++++-- .../testing/selftests/drivers/net/netcons_basic.sh | 52 +++++++++++++--------- 2 files changed, 54 insertions(+), 24 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh b/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh index 1b508131a6461..e0bc5927e83d5 100644 --- a/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh +++ b/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh @@ -96,6 +96,8 @@ function set_network() { }

function create_dynamic_target() { + local FORMAT=${1:-"extended"} + DSTMAC=$(ip netns exec "${NAMESPACE}" \ ip link show "${DSTIF}" | awk '/ether/ {print $2}')

@@ -107,6 +109,16 @@ function create_dynamic_target() { echo "${DSTMAC}" > "${NETCONS_PATH}"/remote_mac echo "${SRCIF}" > "${NETCONS_PATH}"/dev_name

+ if [ "${FORMAT}" == "basic" ] + then + # Basic target does not support release + echo 0 > "${NETCONS_PATH}"/release + echo 0 > "${NETCONS_PATH}"/extended + elif [ "${FORMAT}" == "extended" ] + then + echo 1 > "${NETCONS_PATH}"/extended + fi + echo 1 > "${NETCONS_PATH}"/enabled }

@@ -160,6 +172,7 @@ function listen_port_and_save_to() {

function validate_result() { local TMPFILENAME="$1" + local FORMAT=${2:-"extended"}

# TMPFILENAME will contain something like: # 6.11.1-0_fbk0_rc13_509_g30d75cea12f7,13,1822,115075213798,-;netconsole selftest: netcons_gtJHM @@ -177,10 +190,15 @@ function validate_result() { exit "${ksft_fail}" fi

- if ! grep -q "${USERDATA_KEY}=${USERDATA_VALUE}" "${TMPFILENAME}"; then - echo "FAIL: ${USERDATA_KEY}=${USERDATA_VALUE} not found in ${TMPFILENAME}" >&2 - cat "${TMPFILENAME}" >&2 - exit "${ksft_fail}" + # userdata is not supported on basic format target, + # thus, do not validate it. + if [ "${FORMAT}" != "basic" ]; + then + if ! grep -q "${USERDATA_KEY}=${USERDATA_VALUE}" "${TMPFILENAME}"; then + echo "FAIL: ${USERDATA_KEY}=${USERDATA_VALUE} not found in ${TMPFILENAME}" >&2 + cat "${TMPFILENAME}" >&2 + exit "${ksft_fail}" + fi fi

# Delete the file once it is validated, otherwise keep it diff --git a/tools/testing/selftests/drivers/net/netcons_basic.sh b/tools/testing/selftests/drivers/net/netcons_basic.sh index ada6b899c5282..40a6ac6191b8b 100755 --- a/tools/testing/selftests/drivers/net/netcons_basic.sh +++ b/tools/testing/selftests/drivers/net/netcons_basic.sh @@ -32,23 +32,35 @@ check_for_dependencies echo "6 5" > /proc/sys/kernel/printk # Remove the namespace, interfaces and netconsole target on exit trap cleanup EXIT -# Create one namespace and two interfaces -set_network -# Create a dynamic target for netconsole -create_dynamic_target -# Set userdata "key" with the "value" value -set_user_data -# Listed for netconsole port inside the namespace and destination interface -listen_port_and_save_to "${OUTPUT_FILE}" & -# Wait for socat to start and listen to the port. -wait_local_port_listen "${NAMESPACE}" "${PORT}" udp -# Send the message -echo "${MSG}: ${TARGET}" > /dev/kmsg -# Wait until socat saves the file to disk -busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}" - -# Make sure the message was received in the dst part -# and exit -validate_result "${OUTPUT_FILE}" - -exit "${ksft_pass} + +# Run the test twice, with different format modes +for FORMAT in "basic" "extended" +do + echo "Running with target mode: ${FORMAT}" + # Create one namespace and two interfaces + set_network + # Create a dynamic target for netconsole + create_dynamic_target "${FORMAT}" + # Only set userdata for extended format + if [ "$FORMAT" == "extended" ] + then + # Set userdata "key" with the "value" value + set_user_data + fi + # Listed for netconsole port inside the namespace and destination interface + listen_port_and_save_to "${OUTPUT_FILE}" & + # Wait for socat to start and listen to the port. + wait_local_port_listen "${NAMESPACE}" "${PORT}" udp + # Send the message + echo "${MSG}: ${TARGET}" > /dev/kmsg + # Wait until socat saves the file to disk + busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}" + + # Make sure the message was received in the dst part + # and exit + validate_result "${OUTPUT_FILE}" "${FORMAT}" + cleanup +done + +trap - EXIT +exit "${ksft_pass}"