From: Russell King Subject: [PATCH 15/18] crypto: marvell: rearrange handling for hw finished hashes Date: Sun, 18 Oct 2015 17:24:42 +0100 Message-ID: References: <20151018161649.GA6651@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Cc: Herbert Xu , "David S. Miller" , linux-crypto@vger.kernel.org To: Boris Brezillon , Arnaud Ebalard , Thomas Petazzoni , Jason Cooper Return-path: Received: from pandora.arm.linux.org.uk ([78.32.30.218]:45288 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932094AbbJRQY4 (ORCPT ); Sun, 18 Oct 2015 12:24:56 -0400 In-Reply-To: <20151018161649.GA6651@n2100.arm.linux.org.uk> Content-Disposition: inline Sender: linux-crypto-owner@vger.kernel.org List-ID: Rearrange the last request handling for hardware finished hashes by moving the generation of the fragment operation into this path. This results in a simplified sequence to handle this case, and allows us to move the software padded case further down into the function. Add comments describing these parts. Signed-off-by: Russell King --- drivers/crypto/marvell/hash.c | 35 ++++++++++++++++++++++++----------- 1 file changed, 24 insertions(+), 11 deletions(-) diff --git a/drivers/crypto/marvell/hash.c b/drivers/crypto/marvell/hash.c index b8ed0478031a..d2265beaaa6b 100644 --- a/drivers/crypto/marvell/hash.c +++ b/drivers/crypto/marvell/hash.c @@ -529,32 +529,45 @@ mv_cesa_ahash_dma_last_req(struct mv_cesa_tdma_chain *chain, struct mv_cesa_op_ctx *op; int ret; - if (frag_len) { + /* + * If the transfer is smaller than our maximum length, and we have + * some data outstanding, we can ask the engine to finish the hash. + */ + if (creq->len <= CESA_SA_DESC_MAC_SRC_TOTAL_LEN_MAX && frag_len) { op = mv_cesa_dma_add_frag(chain, &creq->op_tmpl, frag_len, flags); if (IS_ERR(op)) return op; - } else { - op = NULL; - } - - if (op && creq->len <= CESA_SA_DESC_MAC_SRC_TOTAL_LEN_MAX) { - u32 frag = CESA_SA_DESC_CFG_NOT_FRAG; - - if (!mv_cesa_mac_op_is_first_frag(op)) - frag = CESA_SA_DESC_CFG_LAST_FRAG; - mv_cesa_update_op_cfg(op, frag, CESA_SA_DESC_CFG_FRAG_MSK); + mv_cesa_set_mac_op_total_len(op, creq->len); + mv_cesa_update_op_cfg(op, mv_cesa_mac_op_is_first_frag(op) ? + CESA_SA_DESC_CFG_NOT_FRAG : + CESA_SA_DESC_CFG_LAST_FRAG, + CESA_SA_DESC_CFG_FRAG_MSK); return op; } + /* + * The request is longer than the engine can handle, or we have + * no data outstanding. Manually generate the padding, adding it + * as a "mid" fragment. + */ ret = mv_cesa_ahash_dma_alloc_padding(ahashdreq, flags); if (ret) return ERR_PTR(ret); trailerlen = mv_cesa_ahash_pad_req(creq, ahashdreq->padding); + if (frag_len) { + op = mv_cesa_dma_add_frag(chain, &creq->op_tmpl, frag_len, + flags); + if (IS_ERR(op)) + return op; + } else { + op = NULL; + } + if (op) { len = min(CESA_SA_SRAM_PAYLOAD_SIZE - dma_iter->base.op_len, trailerlen); -- 2.1.0