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crypto: caam - replace sg_count() with sg_nents_for_len()

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Replace internal sg_count() function and the convoluted logic
around it with the standard sg_nents_for_len() function.
src_nents, dst_nents now hold the number of SW S/G entries,
instead of the HW S/G table entries.

With this change, null (zero length) input data for AEAD case
needs to be handled in a visible way. req->src is no longer
(un)mapped, pointer address is set to 0 in SEQ IN PTR command.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Horia Geantă 2017-02-10 14:07:19 +02:00 committed by Herbert Xu
parent fd144d83cc
commit fa0c92db1e
2 changed files with 88 additions and 112 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

177
drivers/crypto/caam/caamalg.c
View File

@ -887,8 +887,8 @@ static int xts_ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
/*
* aead_edesc - s/w-extended aead descriptor
* @src_nents: number of segments in input scatterlist
* @dst_nents: number of segments in output scatterlist
* @src_nents: number of segments in input s/w scatterlist
* @dst_nents: number of segments in output s/w scatterlist
* @sec4_sg_bytes: length of dma mapped sec4_sg space
* @sec4_sg_dma: bus physical mapped address of h/w link table
* @sec4_sg: pointer to h/w link table
@ -905,8 +905,8 @@ struct aead_edesc {
/*
* ablkcipher_edesc - s/w-extended ablkcipher descriptor
* @src_nents: number of segments in input scatterlist
* @dst_nents: number of segments in output scatterlist
* @src_nents: number of segments in input s/w scatterlist
* @dst_nents: number of segments in output s/w scatterlist
* @iv_dma: dma address of iv for checking continuity and link table
* @sec4_sg_bytes: length of dma mapped sec4_sg space
* @sec4_sg_dma: bus physical mapped address of h/w link table
@ -930,10 +930,11 @@ static void caam_unmap(struct device *dev, struct scatterlist *src,
int sec4_sg_bytes)
{
if (dst != src) {
dma_unmap_sg(dev, src, src_nents ? : 1, DMA_TO_DEVICE);
dma_unmap_sg(dev, dst, dst_nents ? : 1, DMA_FROM_DEVICE);
if (src_nents)
dma_unmap_sg(dev, src, src_nents, DMA_TO_DEVICE);
dma_unmap_sg(dev, dst, dst_nents, DMA_FROM_DEVICE);
} else {
dma_unmap_sg(dev, src, src_nents ? : 1, DMA_BIDIRECTIONAL);
dma_unmap_sg(dev, src, src_nents, DMA_BIDIRECTIONAL);
}
if (iv_dma)
@ -1102,7 +1103,7 @@ static void init_aead_job(struct aead_request *req,
init_job_desc_shared(desc, ptr, len, HDR_SHARE_DEFER | HDR_REVERSE);
if (all_contig) {
src_dma = sg_dma_address(req->src);
src_dma = edesc->src_nents ? sg_dma_address(req->src) : 0;
in_options = 0;
} else {
src_dma = edesc->sec4_sg_dma;
@ -1117,7 +1118,7 @@ static void init_aead_job(struct aead_request *req,
out_options = in_options;
if (unlikely(req->src != req->dst)) {
if (!edesc->dst_nents) {
if (edesc->dst_nents == 1) {
dst_dma = sg_dma_address(req->dst);
} else {
dst_dma = edesc->sec4_sg_dma +
@ -1227,10 +1228,11 @@ static void init_ablkcipher_job(u32 *sh_desc, dma_addr_t ptr,
print_hex_dump(KERN_ERR, "presciv@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, req->info,
ivsize, 1);
printk(KERN_ERR "asked=%d, nbytes%d\n", (int)edesc->src_nents ? 100 : req->nbytes, req->nbytes);
pr_err("asked=%d, nbytes%d\n",
(int)edesc->src_nents > 1 ? 100 : req->nbytes, req->nbytes);
dbg_dump_sg(KERN_ERR, "src @"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, req->src,
edesc->src_nents ? 100 : req->nbytes, 1);
edesc->src_nents > 1 ? 100 : req->nbytes, 1);
#endif
len = desc_len(sh_desc);
@ -1247,7 +1249,7 @@ static void init_ablkcipher_job(u32 *sh_desc, dma_addr_t ptr,
append_seq_in_ptr(desc, src_dma, req->nbytes + ivsize, in_options);
if (likely(req->src == req->dst)) {
if (!edesc->src_nents && iv_contig) {
if (edesc->src_nents == 1 && iv_contig) {
dst_dma = sg_dma_address(req->src);
} else {
dst_dma = edesc->sec4_sg_dma +
@ -1255,7 +1257,7 @@ static void init_ablkcipher_job(u32 *sh_desc, dma_addr_t ptr,
out_options = LDST_SGF;
}
} else {
if (!edesc->dst_nents) {
if (edesc->dst_nents == 1) {
dst_dma = sg_dma_address(req->dst);
} else {
dst_dma = edesc->sec4_sg_dma +
@ -1287,13 +1289,13 @@ static void init_ablkcipher_giv_job(u32 *sh_desc, dma_addr_t ptr,
ivsize, 1);
dbg_dump_sg(KERN_ERR, "src @" __stringify(__LINE__) ": ",
DUMP_PREFIX_ADDRESS, 16, 4, req->src,
edesc->src_nents ? 100 : req->nbytes, 1);
edesc->src_nents > 1 ? 100 : req->nbytes, 1);
#endif
len = desc_len(sh_desc);
init_job_desc_shared(desc, ptr, len, HDR_SHARE_DEFER | HDR_REVERSE);
if (!edesc->src_nents) {
if (edesc->src_nents == 1) {
src_dma = sg_dma_address(req->src);
in_options = 0;
} else {
@ -1329,21 +1331,22 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
int src_nents, dst_nents = 0;
struct aead_edesc *edesc;
int sgc;
bool all_contig = true;
int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
int sec4_sg_index, sec4_sg_len, sec4_sg_bytes;
unsigned int authsize = ctx->authsize;
if (unlikely(req->dst != req->src)) {
src_nents = sg_count(req->src, req->assoclen + req->cryptlen);
src_nents = sg_nents_for_len(req->src, req->assoclen +
req->cryptlen);
if (unlikely(src_nents < 0)) {
dev_err(jrdev, "Insufficient bytes (%d) in src S/G\n",
req->assoclen + req->cryptlen);
return ERR_PTR(src_nents);
}
dst_nents = sg_count(req->dst,
req->assoclen + req->cryptlen +
(encrypt ? authsize : (-authsize)));
dst_nents = sg_nents_for_len(req->dst, req->assoclen +
req->cryptlen +
(encrypt ? authsize :
(-authsize)));
if (unlikely(dst_nents < 0)) {
dev_err(jrdev, "Insufficient bytes (%d) in dst S/G\n",
req->assoclen + req->cryptlen +
@ -1351,8 +1354,8 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
return ERR_PTR(dst_nents);
}
} else {
src_nents = sg_count(req->src,
req->assoclen + req->cryptlen +
src_nents = sg_nents_for_len(req->src, req->assoclen +
req->cryptlen +
(encrypt ? authsize : 0));
if (unlikely(src_nents < 0)) {
dev_err(jrdev, "Insufficient bytes (%d) in src S/G\n",
@ -1362,13 +1365,8 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
}
}
/* Check if data are contiguous. */
all_contig = !src_nents;
if (!all_contig)
sec4_sg_len = src_nents;
sec4_sg_len += dst_nents;
sec4_sg_len = src_nents > 1 ? src_nents : 0;
sec4_sg_len += dst_nents > 1 ? dst_nents : 0;
sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
/* allocate space for base edesc and hw desc commands, link tables */
@ -1380,28 +1378,28 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
}
if (likely(req->src == req->dst)) {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_BIDIRECTIONAL);
sgc = dma_map_sg(jrdev, req->src, src_nents, DMA_BIDIRECTIONAL);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
kfree(edesc);
return ERR_PTR(-ENOMEM);
}
} else {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
/* Cover also the case of null (zero length) input data */
if (src_nents) {
sgc = dma_map_sg(jrdev, req->src, src_nents,
DMA_TO_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
kfree(edesc);
return ERR_PTR(-ENOMEM);
}
}
sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1,
DMA_FROM_DEVICE);
sgc = dma_map_sg(jrdev, req->dst, dst_nents, DMA_FROM_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map destination\n");
dma_unmap_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
dma_unmap_sg(jrdev, req->src, src_nents, DMA_TO_DEVICE);
kfree(edesc);
return ERR_PTR(-ENOMEM);
}
@ -1411,15 +1409,15 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
edesc->dst_nents = dst_nents;
edesc->sec4_sg = (void *)edesc + sizeof(struct aead_edesc) +
desc_bytes;
*all_contig_ptr = all_contig;
*all_contig_ptr = !(src_nents > 1);
sec4_sg_index = 0;
if (!all_contig) {
if (src_nents > 1) {
sg_to_sec4_sg_last(req->src, src_nents,
edesc->sec4_sg + sec4_sg_index, 0);
sec4_sg_index += src_nents;
}
if (dst_nents) {
if (dst_nents > 1) {
sg_to_sec4_sg_last(req->dst, dst_nents,
edesc->sec4_sg + sec4_sg_index, 0);
}
@ -1621,12 +1619,12 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
int src_nents, dst_nents = 0, sec4_sg_bytes;
struct ablkcipher_edesc *edesc;
dma_addr_t iv_dma = 0;
bool iv_contig = false;
bool in_contig;
int sgc;
int ivsize = crypto_ablkcipher_ivsize(ablkcipher);
int sec4_sg_index;
int dst_sg_idx, sec4_sg_ents;
src_nents = sg_count(req->src, req->nbytes);
src_nents = sg_nents_for_len(req->src, req->nbytes);
if (unlikely(src_nents < 0)) {
dev_err(jrdev, "Insufficient bytes (%d) in src S/G\n",
req->nbytes);
@ -1634,7 +1632,7 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
}
if (req->dst != req->src) {
dst_nents = sg_count(req->dst, req->nbytes);
dst_nents = sg_nents_for_len(req->dst, req->nbytes);
if (unlikely(dst_nents < 0)) {
dev_err(jrdev, "Insufficient bytes (%d) in dst S/G\n",
req->nbytes);
@ -1643,26 +1641,22 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
}
if (likely(req->src == req->dst)) {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_BIDIRECTIONAL);
sgc = dma_map_sg(jrdev, req->src, src_nents, DMA_BIDIRECTIONAL);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
return ERR_PTR(-ENOMEM);
}
} else {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
sgc = dma_map_sg(jrdev, req->src, src_nents, DMA_TO_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
return ERR_PTR(-ENOMEM);
}
sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1,
DMA_FROM_DEVICE);
sgc = dma_map_sg(jrdev, req->dst, dst_nents, DMA_FROM_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map destination\n");
dma_unmap_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
dma_unmap_sg(jrdev, req->src, src_nents, DMA_TO_DEVICE);
return ERR_PTR(-ENOMEM);
}
}
@ -1675,16 +1669,16 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
return ERR_PTR(-ENOMEM);
}
/*
* Check if iv can be contiguous with source and destination.
* If so, include it. If not, create scatterlist.
*/
if (!src_nents && iv_dma + ivsize == sg_dma_address(req->src))
iv_contig = true;
else
src_nents = src_nents ? : 1;
sec4_sg_bytes = ((iv_contig ? 0 : 1) + src_nents + dst_nents) *
sizeof(struct sec4_sg_entry);
if (src_nents == 1 && iv_dma + ivsize == sg_dma_address(req->src)) {
in_contig = true;
sec4_sg_ents = 0;
} else {
in_contig = false;
sec4_sg_ents = 1 + src_nents;
}
dst_sg_idx = sec4_sg_ents;
sec4_sg_ents += dst_nents > 1 ? dst_nents : 0;
sec4_sg_bytes = sec4_sg_ents * sizeof(struct sec4_sg_entry);
/* allocate space for base edesc and hw desc commands, link tables */
edesc = kzalloc(sizeof(*edesc) + desc_bytes + sec4_sg_bytes,
@ -1702,17 +1696,15 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) +
desc_bytes;
sec4_sg_index = 0;
if (!iv_contig) {
if (!in_contig) {
dma_to_sec4_sg_one(edesc->sec4_sg, iv_dma, ivsize, 0);
sg_to_sec4_sg_last(req->src, src_nents,
edesc->sec4_sg + 1, 0);
sec4_sg_index += 1 + src_nents;
}
if (dst_nents) {
if (dst_nents > 1) {
sg_to_sec4_sg_last(req->dst, dst_nents,
edesc->sec4_sg + sec4_sg_index, 0);
edesc->sec4_sg + dst_sg_idx, 0);
}
edesc->sec4_sg_dma = dma_map_single(jrdev, edesc->sec4_sg,
@ -1733,7 +1725,7 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
sec4_sg_bytes, 1);
#endif
*iv_contig_out = iv_contig;
*iv_contig_out = in_contig;
return edesc;
}
@ -1830,12 +1822,12 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
int src_nents, dst_nents, sec4_sg_bytes;
struct ablkcipher_edesc *edesc;
dma_addr_t iv_dma = 0;
bool iv_contig = false;
bool out_contig;
int sgc;
int ivsize = crypto_ablkcipher_ivsize(ablkcipher);
int sec4_sg_index;
int dst_sg_idx, sec4_sg_ents;
src_nents = sg_count(req->src, req->nbytes);
src_nents = sg_nents_for_len(req->src, req->nbytes);
if (unlikely(src_nents < 0)) {
dev_err(jrdev, "Insufficient bytes (%d) in src S/G\n",
req->nbytes);
@ -1843,8 +1835,7 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
}
if (likely(req->src == req->dst)) {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_BIDIRECTIONAL);
sgc = dma_map_sg(jrdev, req->src, src_nents, DMA_BIDIRECTIONAL);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
return ERR_PTR(-ENOMEM);
@ -1852,26 +1843,23 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
dst_nents = src_nents;
} else {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
sgc = dma_map_sg(jrdev, req->src, src_nents, DMA_TO_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
return ERR_PTR(-ENOMEM);
}
dst_nents = sg_count(req->dst, req->nbytes);
dst_nents = sg_nents_for_len(req->dst, req->nbytes);
if (unlikely(dst_nents < 0)) {
dev_err(jrdev, "Insufficient bytes (%d) in dst S/G\n",
req->nbytes);
return ERR_PTR(dst_nents);
}
sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1,
DMA_FROM_DEVICE);
sgc = dma_map_sg(jrdev, req->dst, dst_nents, DMA_FROM_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map destination\n");
dma_unmap_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
dma_unmap_sg(jrdev, req->src, src_nents, DMA_TO_DEVICE);
return ERR_PTR(-ENOMEM);
}
}
@ -1888,14 +1876,17 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
return ERR_PTR(-ENOMEM);
}
if (!dst_nents && iv_dma + ivsize == sg_dma_address(req->dst))
iv_contig = true;
else
dst_nents = dst_nents ? : 1;
sec4_sg_bytes = ((iv_contig ? 0 : 1) + src_nents + dst_nents) *
sizeof(struct sec4_sg_entry);
sec4_sg_ents = src_nents > 1 ? src_nents : 0;
dst_sg_idx = sec4_sg_ents;
if (dst_nents == 1 && iv_dma + ivsize == sg_dma_address(req->dst)) {
out_contig = true;
} else {
out_contig = false;
sec4_sg_ents += 1 + dst_nents;
}
/* allocate space for base edesc and hw desc commands, link tables */
sec4_sg_bytes = sec4_sg_ents * sizeof(struct sec4_sg_entry);
edesc = kzalloc(sizeof(*edesc) + desc_bytes + sec4_sg_bytes,
GFP_DMA | flags);
if (!edesc) {
@ -1911,18 +1902,14 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) +
desc_bytes;
sec4_sg_index = 0;
if (src_nents) {
if (src_nents > 1)
sg_to_sec4_sg_last(req->src, src_nents, edesc->sec4_sg, 0);
sec4_sg_index += src_nents;
}
if (!iv_contig) {
dma_to_sec4_sg_one(edesc->sec4_sg + sec4_sg_index,
if (!out_contig) {
dma_to_sec4_sg_one(edesc->sec4_sg + dst_sg_idx,
iv_dma, ivsize, 0);
sec4_sg_index += 1;
sg_to_sec4_sg_last(req->dst, dst_nents,
edesc->sec4_sg + sec4_sg_index, 0);
edesc->sec4_sg + dst_sg_idx + 1, 0);
}
edesc->sec4_sg_dma = dma_map_single(jrdev, edesc->sec4_sg,
@ -1943,7 +1930,7 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
sec4_sg_bytes, 1);
#endif
*iv_contig_out = iv_contig;
*iv_contig_out = out_contig;
return edesc;
}

11
drivers/crypto/caam/sg_sw_sec4.h
View File

@ -73,14 +73,3 @@ static inline struct sec4_sg_entry *sg_to_sec4_sg_len(
} while (total);
return sec4_sg_ptr - 1;
}
/* derive number of elements in scatterlist, but return 0 for 1 */
static inline int sg_count(struct scatterlist *sg_list, int nbytes)
{
int sg_nents = sg_nents_for_len(sg_list, nbytes);
if (likely(sg_nents == 1))
return 0;
return sg_nents;
}