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vlan: lockless transmit path

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vlan is a stacked device, like tunnels. We should use the lockless
mechanism we are using in tunnels and loopback.

This patch completely removes locking in TX path.

tx stat counters are added into existing percpu stat structure, renamed
from vlan_rx_stats to vlan_pcpu_stats.

Note : this partially reverts commit 2e59af3dcb (vlan: multiqueue vlan
device)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2010-11-10 23:42:00 +00:00
committed by David S. Miller
parent 8ffab51b3d
commit 4af429d29b
5 changed files with 50 additions and 57 deletions
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20
net/8021q/vlan_netlink.c
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@@ -101,25 +101,6 @@ static int vlan_changelink(struct net_device *dev,
return 0;
}
static int vlan_get_tx_queues(struct net *net,
struct nlattr *tb[],
unsigned int *num_tx_queues,
unsigned int *real_num_tx_queues)
{
struct net_device *real_dev;
if (!tb[IFLA_LINK])
return -EINVAL;
real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
if (!real_dev)
return -ENODEV;
*num_tx_queues = real_dev->num_tx_queues;
*real_num_tx_queues = real_dev->real_num_tx_queues;
return 0;
}
static int vlan_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
@@ -237,7 +218,6 @@ struct rtnl_link_ops vlan_link_ops __read_mostly = {
.maxtype = IFLA_VLAN_MAX,
.policy = vlan_policy,
.priv_size = sizeof(struct vlan_dev_info),
.get_tx_queues = vlan_get_tx_queues,
.setup = vlan_setup,
.validate = vlan_validate,
.newlink = vlan_newlink,