netdev - Re: [PATCH] mac80211: port CCMP to cryptoapi's CCM driver

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Date:	Tue, 08 Oct 2013 13:52:32 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	patches@...aro.org, linville@...driver.com
Subject: Re: [PATCH] mac80211: port CCMP to cryptoapi's CCM driver

On Tue, 2013-10-08 at 13:31 +0200, Ard Biesheuvel wrote:

Hmm, thanks I guess. I'll need to review this in more detail, but I have
a question first:

> +	/* allocate the variable sized aead_request on the stack */
> +	int l = DIV_ROUND_UP(crypto_aead_reqsize(tfm),
> +			     sizeof(struct aead_request));
> +	struct aead_request req[1 + l];

This looks a bit odd, why round up first and then add one? Why even
bother using a struct array rather than some local struct like

struct {
  struct aead_request req;
  u8 data[crypto_aed_reqsize(tfm)];
} req_data;

or so?

johannes

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