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net: introduce helper dev_change_tx_queue_len()

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This patch promotes the local change_tx_queue_len() to a core
helper function, dev_change_tx_queue_len(), so that rtnetlink
and net-sysfs could share the code. This also prepares for the
following patch.

Note, the -EFAULT in the original code doesn't make sense,
we should propagate the errno from notifiers.

Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang
2018-01-25 18:26:22 -08:00
committed by David S. Miller
parent 4cd879515d
commit 6a643ddb56
4 changed files with 34 additions and 36 deletions
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28
net/core/dev.c
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@@ -7047,6 +7047,34 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
}
EXPORT_SYMBOL(dev_set_mtu);
/**
* dev_change_tx_queue_len - Change TX queue length of a netdevice
* @dev: device
* @new_len: new tx queue length
*/
int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len)
{
unsigned int orig_len = dev->tx_queue_len;
int res;
if (new_len != (unsigned int)new_len)
return -ERANGE;
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 res;
}
}
return 0;
}
/**
* dev_set_group - Change group this device belongs to
* @dev: device