[PATCH net-next RFC 2/6] netconsole: allow configuring the rate limit interval through configfs
From: Breno Leitao <leitao@debian.org>
Date: 2026-08-18 10:29:54
Also in:
linux-doc, linux-kselftest, lkml
Subsystem:
netconsole, networking drivers, the rest · Maintainers:
Breno Leitao, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
The per-target token bucket has no interface, so every target is still unlimited. Expose the interval as ratelimit_interval_ms through configfs. It defaults to zero, so a target stays unlimited until an administrator sets one. Signed-off-by: Breno Leitao <leitao@debian.org> --- drivers/net/netconsole.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 2ad514afa2b89..6f94495d0abc3 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c@@ -940,6 +940,14 @@ static ssize_t transmit_errors_show(struct config_item *item, char *buf) return sysfs_emit(buf, "%llu\n", xmit_drop_count + enomem_count); } +static ssize_t ratelimit_interval_ms_show(struct config_item *item, char *buf) +{ + struct netconsole_target *nt = to_target(item); + + return sysfs_emit(buf, "%u\n", + jiffies_to_msecs(READ_ONCE(nt->ratelimit.interval))); +} + /* configfs helper to display if cpu_nr sysdata feature is enabled */ static ssize_t sysdata_cpu_nr_enabled_show(struct config_item *item, char *buf) {
@@ -1335,6 +1343,29 @@ static ssize_t remote_mac_store(struct config_item *item, const char *buf, return ret; } +static ssize_t ratelimit_interval_ms_store(struct config_item *item, + const char *buf, size_t count) +{ + struct netconsole_target *nt = to_target(item); + unsigned int interval; + unsigned long jifs; + ssize_t ret; + + ret = kstrtouint(buf, 10, &interval); + if (ret) + return ret; + + jifs = msecs_to_jiffies(interval); + if (jifs > INT_MAX) + return -ERANGE; + + dynamic_netconsole_mutex_lock(); + WRITE_ONCE(nt->ratelimit.interval, jifs); + dynamic_netconsole_mutex_unlock(); + + return count; +} + struct userdatum { struct config_item item; char value[MAX_EXTRADATA_VALUE_LEN];
@@ -1699,6 +1730,7 @@ CONFIGFS_ATTR_RO(, local_mac); CONFIGFS_ATTR(, remote_mac); CONFIGFS_ATTR(, release); CONFIGFS_ATTR_RO(, transmit_errors); +CONFIGFS_ATTR(, ratelimit_interval_ms); static struct configfs_attribute *netconsole_target_attrs[] = { &attr_enabled,
@@ -1712,6 +1744,7 @@ static struct configfs_attribute *netconsole_target_attrs[] = { &attr_local_mac, &attr_remote_mac, &attr_transmit_errors, + &attr_ratelimit_interval_ms, NULL, };
--
2.53.0-Meta