On Mon, Sep 21, 2015 at 08:58:23PM +0200, Stephan Mueller wrote:
>
> +/*
> + * Fast forward the SGL to the "end" length minus SEMIBSIZE.
> + * The start in the SGL defined by the fast-forward is returned with
> + * the walk variable
> + */
> +static void crypto_kw_scatterlist_ff(struct scatter_walk *walk,
> + struct scatterlist *sg,
> + unsigned int end)
> +{
> + unsigned int skip = 0;
> +
> + /* The caller should only operate on full SEMIBLOCKs. */
> + BUG_ON(end < SEMIBSIZE);
> +
> + skip = end - SEMIBSIZE;
> + while (sg) {
> + if (sg->length > skip) {
> + scatterwalk_start(walk, sg);
> + scatterwalk_advance(walk, skip);
> + break;
> + } else
> + skip -= sg->length;
> +
> + sg = sg_next(sg);
> + }
> +}
This looks very slow but it's conceptually nice and I like it :)
I'll apply this today.
Thanks,
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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