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authorJason Wang <jasowang@redhat.com>2016-06-30 14:45:35 +0800
committerDavid S. Miller <davem@davemloft.net>2016-07-01 05:32:17 -0400
commit08294a26e15d7baf1e14ee569e9f2bc82a7ae768 (patch)
treef64f414e88d4352b4f20f4db869848caa4144c62 /net/core/net-sysfs.c
parentbf900b3dbefee49855c17aa09fb4245346a78fb3 (diff)
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>
Diffstat (limited to 'net/core/net-sysfs.c')
-rw-r--r--net/core/net-sysfs.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 7a0b616557ab..6e4f34721080 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -322,7 +322,20 @@ NETDEVICE_SHOW_RW(flags, fmt_hex);
static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
{
- dev->tx_queue_len = new_len;
+ int res, orig_len = dev->tx_queue_len;
+
+ if (new_len != orig_len) {
+ dev->tx_queue_len = new_len;
+ res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
+ res = notifier_to_errno(res);
+ if (res) {
+ netdev_err(dev,
+ "refused to change device tx_queue_len\n");
+ dev->tx_queue_len = orig_len;
+ return -EFAULT;
+ }
+ }
+
return 0;
}