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netconsole: convert 'enabled' flag to enum for clearer state management

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This patch refactors the netconsole driver's target enabled state from a
simple boolean to an explicit enum (`target_state`).

This allow the states to be expanded to a new state in the upcoming
change.

Co-developed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Andre Carvalho <asantostc@gmail.com>
Tested-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20260118-netcons-retrigger-v11-2-4de36aebcf48@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andre Carvalho
2026-01-18 11:00:22 +00:00
committed by Jakub Kicinski
parent d793db4aa0
commit a46bb0103c
1 changed files with 28 additions and 24 deletions
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52
drivers/net/netconsole.c
View File

@@ -135,12 +135,12 @@ enum target_state {
* @sysdata_fields: Sysdata features enabled.
* @msgcounter: Message sent counter.
* @stats: Packet send stats for the target. Used for debugging.
* @enabled: On / off knob to enable / disable target.
* @state: State of the target.
* Visible from userspace (read-write).
* We maintain a strict 1:1 correspondence between this and
* whether the corresponding netpoll is active or inactive.
* Also, other parameters of a target may be modified at
* runtime only when it is disabled (enabled == 0).
* runtime only when it is disabled (state == STATE_DISABLED).
* @extended: Denotes whether console is extended or not.
* @release: Denotes whether kernel release version should be prepended
* to the message. Depends on extended console.
@@ -170,7 +170,7 @@ struct netconsole_target {
u32 msgcounter;
#endif
struct netconsole_target_stats stats;
bool enabled;
enum target_state state;
bool extended;
bool release;
struct netpoll np;
@@ -262,6 +262,7 @@ static struct netconsole_target *alloc_and_init(void)
nt->np.local_port = 6665;
nt->np.remote_port = 6666;
eth_broadcast_addr(nt->np.remote_mac);
nt->state = STATE_DISABLED;
return nt;
}
@@ -280,7 +281,7 @@ static void netconsole_process_cleanups_core(void)
mutex_lock(&target_cleanup_list_lock);
list_for_each_entry_safe(nt, tmp, &target_cleanup_list, list) {
/* all entries in the cleanup_list needs to be disabled */
WARN_ON_ONCE(nt->enabled);
WARN_ON_ONCE(nt->state == STATE_ENABLED);
do_netpoll_cleanup(&nt->np);
/* moved the cleaned target to target_list. Need to hold both
* locks
@@ -403,7 +404,7 @@ static void trim_newline(char *s, size_t maxlen)
static ssize_t enabled_show(struct config_item *item, char *buf)
{
return sysfs_emit(buf, "%d\n", to_target(item)->enabled);
return sysfs_emit(buf, "%d\n", to_target(item)->state == STATE_ENABLED);
}
static ssize_t extended_show(struct config_item *item, char *buf)
@@ -570,8 +571,8 @@ static ssize_t enabled_store(struct config_item *item,
const char *buf, size_t count)
{
struct netconsole_target *nt = to_target(item);
bool enabled, current_enabled;
unsigned long flags;
bool enabled;
ssize_t ret;
mutex_lock(&dynamic_netconsole_mutex);
@@ -580,9 +581,10 @@ static ssize_t enabled_store(struct config_item *item,
goto out_unlock;
ret = -EINVAL;
if (enabled == nt->enabled) {
current_enabled = nt->state == STATE_ENABLED;
if (enabled == current_enabled) {
pr_info("network logging has already %s\n",
nt->enabled ? "started" : "stopped");
current_enabled ? "started" : "stopped");
goto out_unlock;
}
@@ -615,16 +617,16 @@ static ssize_t enabled_store(struct config_item *item,
if (ret)
goto out_unlock;
nt->enabled = true;
nt->state = STATE_ENABLED;
pr_info("network logging started\n");
} else { /* false */
/* We need to disable the netconsole before cleaning it up
* otherwise we might end up in write_msg() with
* nt->np.dev == NULL and nt->enabled == true
* nt->np.dev == NULL and nt->state == STATE_ENABLED
*/
mutex_lock(&target_cleanup_list_lock);
spin_lock_irqsave(&target_list_lock, flags);
nt->enabled = false;
nt->state = STATE_DISABLED;
/* Remove the target from the list, while holding
* target_list_lock
*/
@@ -653,7 +655,7 @@ static ssize_t release_store(struct config_item *item, const char *buf,
ssize_t ret;
mutex_lock(&dynamic_netconsole_mutex);
if (nt->enabled) {
if (nt->state == STATE_ENABLED) {
pr_err("target (%s) is enabled, disable to update parameters\n",
config_item_name(&nt->group.cg_item));
ret = -EINVAL;
@@ -680,7 +682,7 @@ static ssize_t extended_store(struct config_item *item, const char *buf,
ssize_t ret;
mutex_lock(&dynamic_netconsole_mutex);
if (nt->enabled) {
if (nt->state == STATE_ENABLED) {
pr_err("target (%s) is enabled, disable to update parameters\n",
config_item_name(&nt->group.cg_item));
ret = -EINVAL;
@@ -704,7 +706,7 @@ static ssize_t dev_name_store(struct config_item *item, const char *buf,
struct netconsole_target *nt = to_target(item);
mutex_lock(&dynamic_netconsole_mutex);
if (nt->enabled) {
if (nt->state == STATE_ENABLED) {
pr_err("target (%s) is enabled, disable to update parameters\n",
config_item_name(&nt->group.cg_item));
mutex_unlock(&dynamic_netconsole_mutex);
@@ -725,7 +727,7 @@ static ssize_t local_port_store(struct config_item *item, const char *buf,
ssize_t ret = -EINVAL;
mutex_lock(&dynamic_netconsole_mutex);
if (nt->enabled) {
if (nt->state == STATE_ENABLED) {
pr_err("target (%s) is enabled, disable to update parameters\n",
config_item_name(&nt->group.cg_item));
goto out_unlock;
@@ -747,7 +749,7 @@ static ssize_t remote_port_store(struct config_item *item,
ssize_t ret = -EINVAL;
mutex_lock(&dynamic_netconsole_mutex);
if (nt->enabled) {
if (nt->state == STATE_ENABLED) {
pr_err("target (%s) is enabled, disable to update parameters\n",
config_item_name(&nt->group.cg_item));
goto out_unlock;
@@ -770,7 +772,7 @@ static ssize_t local_ip_store(struct config_item *item, const char *buf,
int ipv6;
mutex_lock(&dynamic_netconsole_mutex);
if (nt->enabled) {
if (nt->state == STATE_ENABLED) {
pr_err("target (%s) is enabled, disable to update parameters\n",
config_item_name(&nt->group.cg_item));
goto out_unlock;
@@ -795,7 +797,7 @@ static ssize_t remote_ip_store(struct config_item *item, const char *buf,
int ipv6;
mutex_lock(&dynamic_netconsole_mutex);
if (nt->enabled) {
if (nt->state == STATE_ENABLED) {
pr_err("target (%s) is enabled, disable to update parameters\n",
config_item_name(&nt->group.cg_item));
goto out_unlock;
@@ -830,7 +832,7 @@ static ssize_t remote_mac_store(struct config_item *item, const char *buf,
ssize_t ret = -EINVAL;
mutex_lock(&dynamic_netconsole_mutex);
if (nt->enabled) {
if (nt->state == STATE_ENABLED) {
pr_err("target (%s) is enabled, disable to update parameters\n",
config_item_name(&nt->group.cg_item));
goto out_unlock;
@@ -1326,7 +1328,7 @@ static void drop_netconsole_target(struct config_group *group,
* The target may have never been enabled, or was manually disabled
* before being removed so netpoll may have already been cleaned up.
*/
if (nt->enabled)
if (nt->state == STATE_ENABLED)
netpoll_cleanup(&nt->np);
config_item_put(&nt->group.cg_item);
@@ -1444,7 +1446,7 @@ static int netconsole_netdev_event(struct notifier_block *this,
case NETDEV_RELEASE:
case NETDEV_JOIN:
case NETDEV_UNREGISTER:
nt->enabled = false;
nt->state = STATE_DISABLED;
list_move(&nt->list, &target_cleanup_list);
stopped = true;
}
@@ -1725,7 +1727,8 @@ static void write_ext_msg(struct console *con, const char *msg,
spin_lock_irqsave(&target_list_lock, flags);
list_for_each_entry(nt, &target_list, list)
if (nt->extended && nt->enabled && netif_running(nt->np.dev))
if (nt->extended && nt->state == STATE_ENABLED &&
netif_running(nt->np.dev))
send_ext_msg_udp(nt, msg, len);
spin_unlock_irqrestore(&target_list_lock, flags);
}
@@ -1745,7 +1748,8 @@ static void write_msg(struct console *con, const char *msg, unsigned int len)
spin_lock_irqsave(&target_list_lock, flags);
list_for_each_entry(nt, &target_list, list) {
if (!nt->extended && nt->enabled && netif_running(nt->np.dev)) {
if (!nt->extended && nt->state == STATE_ENABLED &&
netif_running(nt->np.dev)) {
/*
* We nest this inside the for-each-target loop above
* so that we're able to get as much logging out to
@@ -1901,7 +1905,7 @@ static struct netconsole_target *alloc_param_target(char *target_config,
*/
goto fail;
} else {
nt->enabled = true;
nt->state = STATE_ENABLED;
}
populate_configfs_item(nt, cmdline_count);