net: introduce NETDEV_CHANGE_TX_QUEUE_LEN
This patch introduces a new event - NETDEV_CHANGE_TX_QUEUE_LEN, this
will be triggered when tx_queue_len. It could be used by net device
who want to do some processing at that time. An example is tun who may
want to resize tx array when tx_queue_len is changed.
Cc: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index cfed7bc..a9e3805 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1927,11 +1927,19 @@
if (tb[IFLA_TXQLEN]) {
unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
+ unsigned long orig_len = dev->tx_queue_len;
- if (dev->tx_queue_len ^ value)
+ if (dev->tx_queue_len ^ value) {
+ dev->tx_queue_len = value;
+ err = call_netdevice_notifiers(
+ NETDEV_CHANGE_TX_QUEUE_LEN, dev);
+ err = notifier_to_errno(err);
+ if (err) {
+ dev->tx_queue_len = orig_len;
+ goto errout;
+ }
status |= DO_SETLINK_NOTIFY;
-
- dev->tx_queue_len = value;
+ }
}
if (tb[IFLA_OPERSTATE])