netdev - Re: [PATCH V3 2/6] net/ethtool: support get coalesce per queue

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Date:	Sun, 17 Jan 2016 02:06:33 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	kan.liang@...el.com, netdev@...r.kernel.org, davem@...emloft.net,
	bwh@...nel.org
Cc:	jesse.brandeburg@...el.com, andi@...stfloor.org,
	f.fainelli@...il.com, alexander.duyck@...il.com,
	jeffrey.t.kirsher@...el.com, shannon.nelson@...el.com,
	carolyn.wyborny@...el.com, donald.c.skidmore@...el.com,
	mitch.a.williams@...el.com, ogerlitz@...lanox.com,
	edumazet@...gle.com, jiri@...lanox.com, sfeldma@...il.com,
	gospo@...ulusnetworks.com, sasha.levin@...cle.com,
	dsahern@...il.com, tj@...nel.org, cascardo@...hat.com,
	corbet@....net
Subject: Re: [PATCH V3 2/6] net/ethtool: support get coalesce per queue

On Thu, 2016-01-14 at 09:08 -0500, kan.liang@...el.com wrote:
[...]
> @@ -1814,6 +1840,10 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
>  	case ETHTOOL_GTUNABLE:
>  		break;
>  	case ETHTOOL_PERQUEUE:
> +		if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
> +			return -EFAULT;
> +		if (sub_cmd == ETHTOOL_GCOALESCE)
> +			break;

ETHTOOL_PERQUEUE should be handled before the containing switch(), so
we can then apply the switch() to sub_cmd; something like this:

	if (ethcmd == ETHTOOL_PERQUEUE) {
		if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
			return -EFAULT;
	} else {
		sub_cmd = ethcmd;
	}

	switch (sub_cmd) {
	...
	}

Ben.

>  	default:
>  		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
>  			return -EPERM;
-- 
Ben Hutchings
Theory and practice are closer in theory than in practice.
                                - John Levine, moderator of comp.compilers
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