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 | |
| parent | skb_array: add wrappers for resizing (diff) | |
| download | linux-dev-08294a26e15d7baf1e14ee569e9f2bc82a7ae768.tar.xz linux-dev-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')
| -rw-r--r-- | net/core/net-sysfs.c | 15 | ||||
| -rw-r--r-- | net/core/rtnetlink.c | 16 |
2 files changed, 26 insertions, 5 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; } 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]) |