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/*
* Copyright (c) 2011 Maxim Levitsky
*
* This file is part of linux cryptodev.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <crypto/scatterwalk.h>
#include <linux/scatterlist.h>
#include "util.h"
/* These were taken from Maxim Levitsky's patch to lkml.
*/
struct scatterlist *cryptodev_sg_advance(struct scatterlist *sg, int consumed)
{
while (consumed >= sg->length) {
consumed -= sg->length;
sg = sg_next(sg);
if (!sg)
break;
}
WARN_ON(!sg && consumed);
if (!sg)
return NULL;
sg->offset += consumed;
sg->length -= consumed;
if (sg->offset >= PAGE_SIZE) {
struct page *page =
nth_page(sg_page(sg), sg->offset / PAGE_SIZE);
sg_set_page(sg, page, sg->length, sg->offset % PAGE_SIZE);
}
return sg;
}
/**
* cryptodev_sg_copy - copies sg entries from sg_from to sg_to, such
* as sg_to covers first 'len' bytes from sg_from.
*/
int cryptodev_sg_copy(struct scatterlist *sg_from, struct scatterlist *sg_to, int len)
{
while (len > sg_from->length) {
len -= sg_from->length;
sg_set_page(sg_to, sg_page(sg_from),
sg_from->length, sg_from->offset);
sg_to = sg_next(sg_to);
sg_from = sg_next(sg_from);
if (len && (!sg_from || !sg_to))
return -ENOMEM;
}
if (len)
sg_set_page(sg_to, sg_page(sg_from),
len, sg_from->offset);
sg_mark_end(sg_to);
return 0;
}
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