diff options
| author | Jason Wang <jasowang@redhat.com> | 2016-06-30 14:45:35 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-07-01 05:32:17 -0400 |
| commit | 08294a26e15d7baf1e14ee569e9f2bc82a7ae768 (patch) | |
| tree | f64f414e88d4352b4f20f4db869848caa4144c62 /net/core/rtnetlink.c | |
| parent | bf900b3dbefee49855c17aa09fb4245346a78fb3 (diff) | |
| download | lwn-08294a26e15d7baf1e14ee569e9f2bc82a7ae768.tar.gz lwn-08294a26e15d7baf1e14ee569e9f2bc82a7ae768.zip | |
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/rtnetlink.c')
| -rw-r--r-- | net/core/rtnetlink.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index cfed7bc14ee6..a9e3805af739 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1927,11 +1927,19 @@ static int do_setlink(const struct sk_buff *skb, if (tb[IFLA_TXQLEN]) { unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]); - - if (dev->tx_queue_len ^ value) + unsigned long orig_len = dev->tx_queue_len; + + 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]) |