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

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Date:	Tue, 10 Nov 2009 14:34:41 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
CC:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCH] ifb: add multi-queue support

Changli Gao a écrit :
> On Tue, Nov 10, 2009 at 8:45 PM, Patrick McHardy <kaber@...sh.net> wrote:
>> Its a trivial change, you can put them in the same patch:
>>
>> static int ifb_get_tx_queues(struct net *net, struct nlattr *tb[],
>>                             unsigned int *num_tx_queues,
>>                             unsigned int *real_num_tx_queues)
>> {
>>    unsigned int n = 1;
>>
>>    if (tb[IFLA_NTXQ])
>>       n = nla_get_u32(tb[IFLA_NTXQ]);
>>
>>    *num_tx_queues = n;
>>    *real_num_tx_queues = n;
>>    return 0;
>> }
>>
> 
> Is IFLA_NTXQ added? I didn't find it in any branch. And I think both
> num_tx_queueus and real_num_tx_queues are needed.
> 

I believe Patrick was referring to vlan get_tx_queues() implementation,
but it actually gets values from real device (tb[IFLA_LINK])

In your case you'll need to add a new IFLA_NTXQ attribute, and
change iproute2 to pass this new attribute at link creation.
(check include/linux/if_link.h)

ip link add link .....  ntxq 2

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;
}


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