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Date: Wed, 23 Sep 2015 13:55:25 +0200
From: LABBE Corentin <clabbe.montjoie@...il.com>
To: herbert@...dor.apana.org.au, davem@...emloft.net
Cc: linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
LABBE Corentin <clabbe.montjoie@...il.com>
Subject: [PATCH 1/4] crypto: talitos: dma_map_sg can handle chained SG
The talitos driver use two dma_map_sg path
according to SG are chained or not.
Since dma_map_sg can handle both case, clean the code with all
references to sg chained.
Thus removing talitos_map_sg, talitos_unmap_sg_chain
and sg_count functions.
Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
drivers/crypto/talitos.c | 104 ++++++++---------------------------------------
1 file changed, 18 insertions(+), 86 deletions(-)
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 3b20a1b..46f531e 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -857,8 +857,6 @@ badkey:
* talitos_edesc - s/w-extended descriptor
* @src_nents: number of segments in input scatterlist
* @dst_nents: number of segments in output scatterlist
- * @src_chained: whether src is chained or not
- * @dst_chained: whether dst is chained or not
* @icv_ool: whether ICV is out-of-line
* @iv_dma: dma address of iv for checking continuity and link table
* @dma_len: length of dma mapped link_tbl space
@@ -874,8 +872,6 @@ badkey:
struct talitos_edesc {
int src_nents;
int dst_nents;
- bool src_chained;
- bool dst_chained;
bool icv_ool;
dma_addr_t iv_dma;
int dma_len;
@@ -887,29 +883,6 @@ struct talitos_edesc {
};
};
-static int talitos_map_sg(struct device *dev, struct scatterlist *sg,
- unsigned int nents, enum dma_data_direction dir,
- bool chained)
-{
- if (unlikely(chained))
- while (sg) {
- dma_map_sg(dev, sg, 1, dir);
- sg = sg_next(sg);
- }
- else
- dma_map_sg(dev, sg, nents, dir);
- return nents;
-}
-
-static void talitos_unmap_sg_chain(struct device *dev, struct scatterlist *sg,
- enum dma_data_direction dir)
-{
- while (sg) {
- dma_unmap_sg(dev, sg, 1, dir);
- sg = sg_next(sg);
- }
-}
-
static void talitos_sg_unmap(struct device *dev,
struct talitos_edesc *edesc,
struct scatterlist *src,
@@ -919,24 +892,13 @@ static void talitos_sg_unmap(struct device *dev,
unsigned int dst_nents = edesc->dst_nents ? : 1;
if (src != dst) {
- if (edesc->src_chained)
- talitos_unmap_sg_chain(dev, src, DMA_TO_DEVICE);
- else
- dma_unmap_sg(dev, src, src_nents, DMA_TO_DEVICE);
+ dma_unmap_sg(dev, src, src_nents, DMA_TO_DEVICE);
if (dst) {
- if (edesc->dst_chained)
- talitos_unmap_sg_chain(dev, dst,
- DMA_FROM_DEVICE);
- else
- dma_unmap_sg(dev, dst, dst_nents,
- DMA_FROM_DEVICE);
+ dma_unmap_sg(dev, dst, dst_nents, DMA_FROM_DEVICE);
}
} else
- if (edesc->src_chained)
- talitos_unmap_sg_chain(dev, src, DMA_BIDIRECTIONAL);
- else
- dma_unmap_sg(dev, src, src_nents, DMA_BIDIRECTIONAL);
+ dma_unmap_sg(dev, src, src_nents, DMA_BIDIRECTIONAL);
}
static void ipsec_esp_unmap(struct device *dev,
@@ -1118,10 +1080,9 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
map_single_talitos_ptr(dev, &desc->ptr[0], ctx->authkeylen, &ctx->key,
DMA_TO_DEVICE);
- sg_count = talitos_map_sg(dev, areq->src, edesc->src_nents ?: 1,
- (areq->src == areq->dst) ? DMA_BIDIRECTIONAL
- : DMA_TO_DEVICE,
- edesc->src_chained);
+ sg_count = dma_map_sg(dev, areq->src, edesc->src_nents ?: 1,
+ (areq->src == areq->dst) ? DMA_BIDIRECTIONAL
+ : DMA_TO_DEVICE);
/* hmac data */
desc->ptr[1].len = cpu_to_be16(areq->assoclen);
@@ -1185,9 +1146,8 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
desc->ptr[5].j_extent = authsize;
if (areq->src != areq->dst)
- sg_count = talitos_map_sg(dev, areq->dst,
- edesc->dst_nents ? : 1,
- DMA_FROM_DEVICE, edesc->dst_chained);
+ sg_count = dma_map_sg(dev, areq->dst, edesc->dst_nents ? : 1,
+ DMA_FROM_DEVICE);
edesc->icv_ool = false;
@@ -1234,26 +1194,6 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
}
/*
- * derive number of elements in scatterlist
- */
-static int sg_count(struct scatterlist *sg_list, int nbytes, bool *chained)
-{
- struct scatterlist *sg = sg_list;
- int sg_nents = 0;
-
- *chained = false;
- while (nbytes > 0 && sg) {
- sg_nents++;
- nbytes -= sg->length;
- if (!sg_is_last(sg) && (sg + 1)->length == 0)
- *chained = true;
- sg = sg_next(sg);
- }
-
- return sg_nents;
-}
-
-/*
* allocate and map the extended descriptor
*/
static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
@@ -1270,7 +1210,6 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
{
struct talitos_edesc *edesc;
int src_nents, dst_nents, alloc_len, dma_len;
- bool src_chained = false, dst_chained = false;
dma_addr_t iv_dma = 0;
gfp_t flags = cryptoflags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
@@ -1287,18 +1226,16 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
iv_dma = dma_map_single(dev, iv, ivsize, DMA_TO_DEVICE);
if (!dst || dst == src) {
- src_nents = sg_count(src, assoclen + cryptlen + authsize,
- &src_chained);
+ src_nents = sg_nents_for_len(src,
+ assoclen + cryptlen + authsize);
src_nents = (src_nents == 1) ? 0 : src_nents;
dst_nents = dst ? src_nents : 0;
} else { /* dst && dst != src*/
- src_nents = sg_count(src, assoclen + cryptlen +
- (encrypt ? 0 : authsize),
- &src_chained);
+ src_nents = sg_nents_for_len(src, assoclen + cryptlen +
+ (encrypt ? 0 : authsize));
src_nents = (src_nents == 1) ? 0 : src_nents;
- dst_nents = sg_count(dst, assoclen + cryptlen +
- (encrypt ? authsize : 0),
- &dst_chained);
+ dst_nents = sg_nents_for_len(dst, assoclen + cryptlen +
+ (encrypt ? authsize : 0));
dst_nents = (dst_nents == 1) ? 0 : dst_nents;
}
@@ -1332,8 +1269,6 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
edesc->src_nents = src_nents;
edesc->dst_nents = dst_nents;
- edesc->src_chained = src_chained;
- edesc->dst_chained = dst_chained;
edesc->iv_dma = iv_dma;
edesc->dma_len = dma_len;
if (dma_len)
@@ -1518,8 +1453,7 @@ int map_sg_in_talitos_ptr(struct device *dev, struct scatterlist *src,
} else {
to_talitos_ptr_extent_clear(ptr, is_sec1);
- sg_count = talitos_map_sg(dev, src, edesc->src_nents ? : 1, dir,
- edesc->src_chained);
+ sg_count = dma_map_sg(dev, src, edesc->src_nents ? : 1, dir);
if (sg_count == 1) {
to_talitos_ptr(ptr, sg_dma_address(src), is_sec1);
@@ -1552,8 +1486,7 @@ void map_sg_out_talitos_ptr(struct device *dev, struct scatterlist *dst,
bool is_sec1 = has_ftr_sec1(priv);
if (dir != DMA_NONE)
- sg_count = talitos_map_sg(dev, dst, edesc->dst_nents ? : 1,
- dir, edesc->dst_chained);
+ sg_count = dma_map_sg(dev, dst, edesc->dst_nents ? : 1, dir);
to_talitos_ptr_len(ptr, len, is_sec1);
@@ -1897,12 +1830,11 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
unsigned int nbytes_to_hash;
unsigned int to_hash_later;
unsigned int nsg;
- bool chained;
if (!req_ctx->last && (nbytes + req_ctx->nbuf <= blocksize)) {
/* Buffer up to one whole block */
sg_copy_to_buffer(areq->src,
- sg_count(areq->src, nbytes, &chained),
+ sg_nents_for_len(areq->src, nbytes),
req_ctx->buf + req_ctx->nbuf, nbytes);
req_ctx->nbuf += nbytes;
return 0;
@@ -1935,7 +1867,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
req_ctx->psrc = areq->src;
if (to_hash_later) {
- int nents = sg_count(areq->src, nbytes, &chained);
+ int nents = sg_nents_for_len(areq->src, nbytes);
sg_pcopy_to_buffer(areq->src, nents,
req_ctx->bufnext,
to_hash_later,
--
2.4.9
--
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