diff options
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/cipher.c | 27 | ||||
| -rw-r--r-- | crypto/scatterwalk.c | 89 | ||||
| -rw-r--r-- | crypto/scatterwalk.h | 48 |
3 files changed, 82 insertions, 82 deletions
diff --git a/crypto/cipher.c b/crypto/cipher.c index d8ca0ec..3264617 100644 --- a/crypto/cipher.c +++ b/crypto/cipher.c @@ -45,15 +45,10 @@ static unsigned int crypt_slow(const struct cipher_desc *desc, u8 buffer[bsize * 2 + alignmask]; u8 *src = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); u8 *dst = src + bsize; - unsigned int n; - - n = scatterwalk_copychunks(src, in, bsize, 0); - scatterwalk_advance(in, n); + scatterwalk_copychunks(src, in, bsize, 0); desc->prfn(desc, dst, src, bsize); - - n = scatterwalk_copychunks(dst, out, bsize, 1); - scatterwalk_advance(out, n); + scatterwalk_copychunks(dst, out, bsize, 1); return bsize; } @@ -64,12 +59,16 @@ static inline unsigned int crypt_fast(const struct cipher_desc *desc, unsigned int nbytes, u8 *tmp) { u8 *src, *dst; + u8 *real_src, *real_dst; + + real_src = scatterwalk_map(in, 0); + real_dst = scatterwalk_map(out, 1); - src = in->data; - dst = scatterwalk_samebuf(in, out) ? src : out->data; + src = real_src; + dst = scatterwalk_samebuf(in, out) ? src : real_dst; if (tmp) { - memcpy(tmp, in->data, nbytes); + memcpy(tmp, src, nbytes); src = tmp; dst = tmp; } @@ -77,7 +76,10 @@ static inline unsigned int crypt_fast(const struct cipher_desc *desc, nbytes = desc->prfn(desc, dst, src, nbytes); if (tmp) - memcpy(out->data, tmp, nbytes); + memcpy(real_dst, tmp, nbytes); + + scatterwalk_unmap(real_src, 0); + scatterwalk_unmap(real_dst, 1); scatterwalk_advance(in, nbytes); scatterwalk_advance(out, nbytes); @@ -126,9 +128,6 @@ static int crypt(const struct cipher_desc *desc, tmp = (u8 *)buffer; } - scatterwalk_map(&walk_in, 0); - scatterwalk_map(&walk_out, 1); - n = scatterwalk_clamp(&walk_in, n); n = scatterwalk_clamp(&walk_out, n); diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c index 2953e2c..35172d3 100644 --- a/crypto/scatterwalk.c +++ b/crypto/scatterwalk.c @@ -15,9 +15,11 @@ */ #include <linux/kernel.h> #include <linux/mm.h> +#include <linux/module.h> #include <linux/pagemap.h> #include <linux/highmem.h> -#include <asm/scatterlist.h> +#include <linux/scatterlist.h> + #include "internal.h" #include "scatterwalk.h" @@ -27,88 +29,77 @@ enum km_type crypto_km_types[] = { KM_SOFTIRQ0, KM_SOFTIRQ1, }; +EXPORT_SYMBOL_GPL(crypto_km_types); -static void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out) +static inline void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out) { - if (out) - memcpy(sgdata, buf, nbytes); - else - memcpy(buf, sgdata, nbytes); + void *src = out ? buf : sgdata; + void *dst = out ? sgdata : buf; + + memcpy(dst, src, nbytes); } void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg) { - unsigned int rest_of_page; - walk->sg = sg; - walk->page = sg->page; - walk->len_this_segment = sg->length; - BUG_ON(!sg->length); - rest_of_page = PAGE_CACHE_SIZE - (sg->offset & (PAGE_CACHE_SIZE - 1)); - walk->len_this_page = min(sg->length, rest_of_page); walk->offset = sg->offset; } +EXPORT_SYMBOL_GPL(scatterwalk_start); -void scatterwalk_map(struct scatter_walk *walk, int out) -{ - walk->data = crypto_kmap(walk->page, out) + walk->offset; -} - -static inline void scatterwalk_unmap(struct scatter_walk *walk, int out) +void *scatterwalk_map(struct scatter_walk *walk, int out) { - /* walk->data may be pointing the first byte of the next page; - however, we know we transfered at least one byte. So, - walk->data - 1 will be a virtual address in the mapped page. */ - crypto_kunmap(walk->data - 1, out); + return crypto_kmap(scatterwalk_page(walk), out) + + offset_in_page(walk->offset); } +EXPORT_SYMBOL_GPL(scatterwalk_map); static void scatterwalk_pagedone(struct scatter_walk *walk, int out, unsigned int more) { if (out) - flush_dcache_page(walk->page); + flush_dcache_page(scatterwalk_page(walk)); if (more) { - walk->len_this_segment -= walk->len_this_page; - - if (walk->len_this_segment) { - walk->page++; - walk->len_this_page = min(walk->len_this_segment, - (unsigned)PAGE_CACHE_SIZE); - walk->offset = 0; - } - else + walk->offset += PAGE_SIZE - 1; + walk->offset &= PAGE_MASK; + if (walk->offset >= walk->sg->offset + walk->sg->length) scatterwalk_start(walk, sg_next(walk->sg)); } } void scatterwalk_done(struct scatter_walk *walk, int out, int more) { - scatterwalk_unmap(walk, out); - if (walk->len_this_page == 0 || !more) + if (!offset_in_page(walk->offset) || !more) scatterwalk_pagedone(walk, out, more); } +EXPORT_SYMBOL_GPL(scatterwalk_done); -/* - * Do not call this unless the total length of all of the fragments - * has been verified as multiple of the block size. - */ -int scatterwalk_copychunks(void *buf, struct scatter_walk *walk, - size_t nbytes, int out) +void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, + size_t nbytes, int out) { - while (nbytes > walk->len_this_page) { - memcpy_dir(buf, walk->data, walk->len_this_page, out); - buf += walk->len_this_page; - nbytes -= walk->len_this_page; + for (;;) { + unsigned int len_this_page = scatterwalk_pagelen(walk); + u8 *vaddr; + + if (len_this_page > nbytes) + len_this_page = nbytes; + + vaddr = scatterwalk_map(walk, out); + memcpy_dir(buf, vaddr, len_this_page, out); + scatterwalk_unmap(vaddr, out); + + if (nbytes == len_this_page) + break; + + buf += len_this_page; + nbytes -= len_this_page; - scatterwalk_unmap(walk, out); scatterwalk_pagedone(walk, out, 1); - scatterwalk_map(walk, out); } - memcpy_dir(buf, walk->data, nbytes, out); - return nbytes; + scatterwalk_advance(walk, nbytes); } +EXPORT_SYMBOL_GPL(scatterwalk_copychunks); diff --git a/crypto/scatterwalk.h b/crypto/scatterwalk.h index e79925c..ace595a 100644 --- a/crypto/scatterwalk.h +++ b/crypto/scatterwalk.h @@ -14,17 +14,11 @@ #ifndef _CRYPTO_SCATTERWALK_H #define _CRYPTO_SCATTERWALK_H + #include <linux/mm.h> -#include <asm/scatterlist.h> +#include <linux/scatterlist.h> -struct scatter_walk { - struct scatterlist *sg; - struct page *page; - void *data; - unsigned int len_this_page; - unsigned int len_this_segment; - unsigned int offset; -}; +#include "internal.h" /* Define sg_next is an inline routine now in case we want to change scatterlist to a linked list later. */ @@ -33,26 +27,31 @@ static inline struct scatterlist *sg_next(struct scatterlist *sg) return sg + 1; } -static inline int scatterwalk_samebuf(struct scatter_walk *walk_in, - struct scatter_walk *walk_out) +static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in, + struct scatter_walk *walk_out) { - return walk_in->page == walk_out->page && - walk_in->offset == walk_out->offset; + return !(((walk_in->sg->page - walk_out->sg->page) << PAGE_SHIFT) + + (int)(walk_in->offset - walk_out->offset)); +} + +static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk) +{ + unsigned int len = walk->sg->offset + walk->sg->length - walk->offset; + unsigned int len_this_page = offset_in_page(~walk->offset) + 1; + return len_this_page > len ? len : len_this_page; } static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk, unsigned int nbytes) { - return nbytes > walk->len_this_page ? walk->len_this_page : nbytes; + unsigned int len_this_page = scatterwalk_pagelen(walk); + return nbytes > len_this_page ? len_this_page : nbytes; } static inline void scatterwalk_advance(struct scatter_walk *walk, unsigned int nbytes) { - walk->data += nbytes; walk->offset += nbytes; - walk->len_this_page -= nbytes; - walk->len_this_segment -= nbytes; } static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk, @@ -61,9 +60,20 @@ static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk, return !(walk->offset & alignmask); } +static inline struct page *scatterwalk_page(struct scatter_walk *walk) +{ + return walk->sg->page + (walk->offset >> PAGE_SHIFT); +} + +static inline void scatterwalk_unmap(void *vaddr, int out) +{ + crypto_kunmap(vaddr, out); +} + void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg); -int scatterwalk_copychunks(void *buf, struct scatter_walk *walk, size_t nbytes, int out); -void scatterwalk_map(struct scatter_walk *walk, int out); +void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, + size_t nbytes, int out); +void *scatterwalk_map(struct scatter_walk *walk, int out); void scatterwalk_done(struct scatter_walk *walk, int out, int more); #endif /* _CRYPTO_SCATTERWALK_H */ |