netdev - Re: [PATCH 1/1] cls_cgroup: unify classid syntax to tc

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Message-ID: <20090611093149.GA12543@bombadil.infradead.org>
Date:	Thu, 11 Jun 2009 05:31:49 -0400
From:	Thomas Graf <tgraf@...radead.org>
To:	Minoru Usui <usui@....nes.nec.co.jp>
Cc:	containers@...ts.linux-foundation.org, netdev@...r.kernel.org,
	tgraf@...g.ch, hadi@...erus.ca, jarkao2@...il.com
Subject: Re: [PATCH 1/1] cls_cgroup: unify classid syntax to tc

Very nice, this is a big improvement.

On Thu, Jun 11, 2009 at 06:05:55PM +0900, Minoru Usui wrote:
> +static int get_tc_classid(u32 *classid, const char *str)

Maybe make this return u32?

>  {
> -	return cgrp_cls_state(cgrp)->classid;
> +	u32 maj, min;
> +	char *p;
> +
> +	/* check "0" for reset request */
> +	if (!strcmp(str, "0")) {
> +		*classid = 0;
> +		return 0;
> +	}
> +
> +	/* parse major number */
> +	maj = simple_strtoul(str, &p, 16);
> +	if (p == str) {
> +		maj = 0;
> +		if (*p != ':')
> +			return -EINVAL;
> +	}
> +
> +	/* parse minor number */
> +	if (*p == ':') {
> +		if (maj >= (1<<16))
> +			return -EINVAL;
> +
> +		str = p + 1;
> +		min = simple_strtoul(str, &p, 16);
> +		if (*p != 0)
> +			return -EINVAL;
> +		if (min >= (1<<16))
> +			return -EINVAL;
> +	} else if (*p != 0)
> +		return -EINVAL;

What do you think about keeping things backwards compatible by
accepting both the X:Y and XY format?

} else if (*p != 0)
	return strtoul(str, NULL, 0);
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