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

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Date:	Tue, 10 Nov 2009 12:41:40 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Changli Gao <xiaosuo@...il.com>
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

Changli Gao wrote:
> 2009/11/10 Eric Dumazet <eric.dumazet@...il.com>:
>> Changli Gao a écrit :
>>> 2009/11/10 Eric Dumazet <eric.dumazet@...il.com>:
>>>> Not sure how to solve this problem (several cpus can updates counter in //)
>>>>
>>> Thanks, and follow your suggestions. I can maintain the counter per TX
>>> queue, and update it in a timer handler like ixgbe or implement our
>>> own struct net_device_stats* (*ndo_get_stats)(struct net_device *dev),
>>> and update the counters when it gets called.
>> Please no timer stuff :)
> 
> The whole ifb.c file is attached, please review and test it. Thanks!

> /* Number of TX queues per ifb */
> static int numtxqs = 1;
> module_param(numtxqs, int, 0444);
> MODULE_PARM_DESC(numtxqs, "Number of TX queues per ifb");

Module parameters suck as a configuration API. The existing numifbs
option exists purely for compatibility reasons, I'd prefer if you'd
this to the netlink interface.

> static int __init ifb_init_one(int index)
> {
> 	struct net_device *dev_ifb;
> 	int err;
> 
> 	dev_ifb = alloc_netdev_mq(sizeof(struct ifb_private) * numtxqs, "ifb%d",
> 				  ifb_setup, numtxqs);
> 

This won't work for the rtnl_link setup since the size must
be constant.
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