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c774e93e21
The VIA Padlock device is able to perform much better when multiple blocks are fed to it at once. As this device offers an exceptional throughput rate it is worthwhile to optimise the infrastructure specifically for it. We shift the existing page-sized fast path down to the CBC/ECB functions. We can then replace the CBC/ECB functions with functions provided by the underlying algorithm that performs the multi-block operations. As a side-effect this improves the performance of large cipher operations for all existing algorithm implementations. I've measured the gain to be around 5% for 3DES and 15% for AES. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
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* Cryptographic API.
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*
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* Cipher operations.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* 2002 Adam J. Richter <adam@yggdrasil.com>
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* 2004 Jean-Luc Cooke <jlcooke@certainkey.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <asm/bug.h>
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#include <asm/scatterlist.h>
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#include "internal.h"
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#include "scatterwalk.h"
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enum km_type crypto_km_types[] = {
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KM_USER0,
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KM_USER1,
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KM_SOFTIRQ0,
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KM_SOFTIRQ1,
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};
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static void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out)
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{
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if (out)
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memcpy(sgdata, buf, nbytes);
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else
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memcpy(buf, sgdata, nbytes);
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}
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void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg)
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{
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unsigned int rest_of_page;
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walk->sg = sg;
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walk->page = sg->page;
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walk->len_this_segment = sg->length;
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BUG_ON(!sg->length);
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rest_of_page = PAGE_CACHE_SIZE - (sg->offset & (PAGE_CACHE_SIZE - 1));
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walk->len_this_page = min(sg->length, rest_of_page);
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walk->offset = sg->offset;
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}
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void scatterwalk_map(struct scatter_walk *walk, int out)
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{
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walk->data = crypto_kmap(walk->page, out) + walk->offset;
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}
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static inline void scatterwalk_unmap(struct scatter_walk *walk, int out)
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{
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/* walk->data may be pointing the first byte of the next page;
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however, we know we transfered at least one byte. So,
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walk->data - 1 will be a virtual address in the mapped page. */
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crypto_kunmap(walk->data - 1, out);
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}
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static void scatterwalk_pagedone(struct scatter_walk *walk, int out,
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unsigned int more)
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{
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if (out)
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flush_dcache_page(walk->page);
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if (more) {
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walk->len_this_segment -= walk->len_this_page;
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if (walk->len_this_segment) {
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walk->page++;
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walk->len_this_page = min(walk->len_this_segment,
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(unsigned)PAGE_CACHE_SIZE);
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walk->offset = 0;
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}
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else
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scatterwalk_start(walk, sg_next(walk->sg));
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}
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}
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void scatterwalk_done(struct scatter_walk *walk, int out, int more)
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{
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scatterwalk_unmap(walk, out);
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if (walk->len_this_page == 0 || !more)
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scatterwalk_pagedone(walk, out, more);
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}
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/*
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* Do not call this unless the total length of all of the fragments
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* has been verified as multiple of the block size.
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*/
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int scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
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size_t nbytes, int out)
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{
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while (nbytes > walk->len_this_page) {
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memcpy_dir(buf, walk->data, walk->len_this_page, out);
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buf += walk->len_this_page;
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nbytes -= walk->len_this_page;
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scatterwalk_unmap(walk, out);
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scatterwalk_pagedone(walk, out, 1);
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scatterwalk_map(walk, out);
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}
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memcpy_dir(buf, walk->data, nbytes, out);
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return nbytes;
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}
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