netdev - Re: [PATCH] ifb: add multi-queue support

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Date:	Tue, 10 Nov 2009 20:37:02 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCH] ifb: add multi-queue support

On Tue, Nov 10, 2009 at 8:19 PM, Patrick McHardy <kaber@...sh.net> wrote:
>
> You have to add a get_tx_queues() callback to the rtnl_link_ops.

It is used to get the current real_num_tx_queues and num_tx_queues,
not to setting.

> Additionally you need a new attribute (IFLA_NTXQ or something like
> that) that contains the number of queues. The callback has to parse
> the attribute and set the number of queues accordingly.

It seems another patch is needed first.

>> Does this work?
>>
>>         ifb_link_ops.priv_size = sizeof(struct ifb_private) * numtxqs;
>>         rtnl_lock();
>>         err = __rtnl_link_register(&ifb_link_ops);
>
> Only for the module parameter. For rtnl_link you need to either
> allocate the private space seperately or turn priv_size into
> a callback that returns the required space based on the number
> of queues.

Do you means that if module ifb is loaded automatically, parameters
won't be set correctly?

-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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