netdev - Re: [PATCH net-next-2.6] vlan: multiqueue vlan devices

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Message-ID: <4A9F8999.1060404@gmail.com>
Date:	Thu, 03 Sep 2009 11:17:13 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
CC:	shemminger@...tta.com, brian.haley@...com, kaber@...sh.net,
	jarkao2@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] vlan: multiqueue vlan devices

David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Wed, 02 Sep 2009 21:12:03 +0200
> 
>> [PATCH net-next-2.6] vlan: multiqueue vlan device
>>
>> vlan devices are currently not multi-queue capable.
>>
>> We can do that with a new rtnl_link_ops method,
>> get_tx_queues(), called from rtnl_create_link()
>>
>> This new method gets num_tx_queues/real_num_tx_queues
>> from real device.
>>
>> register_vlan_device() is also handled.
>>
>> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> 
> Applied, but now I need you to do an audit :-)
> 
> I believe that drivers will change the number of TX queues
> in use at times where we'll need to trigger an event or
> something so that vlan's can learn about the value changing.

Here is a followup to enable 'true' multiqueue vlan xmit.

I missed this in my first patch.

[PATCH net-next-2.6] vlan: enable multiqueue xmits

vlan_dev_hard_start_xmit() & vlan_dev_hwaccel_hard_start_xmit()
select txqueue number 0, instead of using index provided by
skb_get_queue_mapping().

This is not correct after commit 2e59af3dcbdf11635c03f
[vlan: multiqueue vlan device] because
txq->tx_packets  & txq->tx_bytes changes are performed on
a single location, and not the right locking.

Fix is to take the appropriate struct netdev_queue pointer

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 53f84c7..3938c3e 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -291,7 +291,8 @@ static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 					    struct net_device *dev)
 {
-	struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
+	int i = skb_get_queue_mapping(skb);
+	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 
 	/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
@@ -329,7 +330,8 @@ static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 						    struct net_device *dev)
 {
-	struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
+	int i = skb_get_queue_mapping(skb);
+	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 	u16 vlan_tci;
 
 	vlan_tci = vlan_dev_info(dev)->vlan_id;
--
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