From: LABBE Corentin Subject: [PATCH 1/4] crypto: talitos: dma_map_sg can handle chained SG Date: Wed, 23 Sep 2015 13:55:25 +0200 Message-ID: <1443009328-12478-2-git-send-email-clabbe.montjoie@gmail.com> References: <1443009328-12478-1-git-send-email-clabbe.montjoie@gmail.com> Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, LABBE Corentin To: herbert@gondor.apana.org.au, davem@davemloft.net Return-path: In-Reply-To: <1443009328-12478-1-git-send-email-clabbe.montjoie@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org 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 --- 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