From patchwork Wed Feb 19 18:23:26 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13982638 X-Patchwork-Delegate: herbert@gondor.apana.org.au Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 32032215053; Wed, 19 Feb 2025 18:24:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739989468; cv=none; b=HmkuipXnLaX3z8Op84Wcltt2Ke7cdh27mmz47DD/7BDl00IiW0ou9ENzK2Wq00RIKG+MDIONymAcLz1tIqrNIUI+SUgmsL8K93zfogk1mNVvzs/LKrJFXHyjMfXjkiXur8KtWpbQ6Qh6prfF8RMxRfSyaEV2MGV+XjJSuQ7j4gk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739989468; c=relaxed/simple; bh=B94Zf/9ecwbLJRGlZygRaCWWQNJw7qERS46dXk1bops=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rqauSynOSXdD/13wLnk+WbLeON+WLjtbJ8uIAF3vrUn46qVgArn8MZrssQ2IqRjxm5vxdGG838saVPk1wzjuPwBxjfXF85OgxmaY0itOxmOTxEB2rXaMNL22eii7cOFmeMmVtzqIHVyQdy4PQmVeHkIYHjYLYnajKSWwP/kZBUg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MYpOTwsq; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MYpOTwsq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1652C4CEE7; Wed, 19 Feb 2025 18:24:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739989468; bh=B94Zf/9ecwbLJRGlZygRaCWWQNJw7qERS46dXk1bops=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MYpOTwsqtsFphHk3bYX2KYLcOnNJJZ6U0psJuditGIz33kygDLh0RLKw98kzhVkn4 cfN2EloO3IAFYH+e6jOSyIBEv30uulkZztbVXB6+DxjBuqdPbeZYS9LWIEdRKvTsEK m7YZiLK4gSPl7zUNxY/dxuTtgT9UnVJH2Tb4v7omixyqp0nK8f2SKPodjNZZT995fq qEClzohCyOdnlJBnaUsqidBhiNApX+MzPBuhAruYC5/+zOqqj6l+CqE7ZN2w3B6Qgk k0Y0rkb5aedYGLJf45djsy0kjnoQ4Fu/Y3Op+qOCNB7L4KakkTl03680ylytIJ8CFm 1jv22HnW7AGDg== From: Eric Biggers To: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v3 04/19] crypto: scatterwalk - add new functions for copying data Date: Wed, 19 Feb 2025 10:23:26 -0800 Message-ID: <20250219182341.43961-5-ebiggers@kernel.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250219182341.43961-1-ebiggers@kernel.org> References: <20250219182341.43961-1-ebiggers@kernel.org> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Eric Biggers Add memcpy_from_sglist() and memcpy_to_sglist() which are more readable versions of scatterwalk_map_and_copy() with the 'out' argument 0 and 1 respectively. They follow the same argument order as memcpy_from_page() and memcpy_to_page() from . Note that in the case of memcpy_from_sglist(), this also happens to be the same argument order that scatterwalk_map_and_copy() uses. The new code is also faster, mainly because it builds the scatter_walk directly without creating a temporary scatterlist. E.g., a 20% performance improvement is seen for copying the AES-GCM auth tag. Make scatterwalk_map_and_copy() be a wrapper around memcpy_from_sglist() and memcpy_to_sglist(). Callers of scatterwalk_map_and_copy() should be updated to call memcpy_from_sglist() or memcpy_to_sglist() directly, but there are a lot of them so they aren't all being updated right away. Also add functions memcpy_from_scatterwalk() and memcpy_to_scatterwalk() which are similar but operate on a scatter_walk instead of a scatterlist. These will replace scatterwalk_copychunks() with the 'out' argument 0 and 1 respectively. Their behavior differs slightly from scatterwalk_copychunks() in that they automatically take care of flushing the dcache when needed, making them easier to use. scatterwalk_copychunks() itself is left unchanged for now. It will be removed after its callers are updated to use other functions instead. Signed-off-by: Eric Biggers --- crypto/scatterwalk.c | 59 ++++++++++++++++++++++++++++++------ include/crypto/scatterwalk.h | 24 +++++++++++++-- 2 files changed, 72 insertions(+), 11 deletions(-) diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c index af436ad02e3ff..2e7a532152d61 100644 --- a/crypto/scatterwalk.c +++ b/crypto/scatterwalk.c @@ -65,26 +65,67 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, scatterwalk_pagedone(walk, out & 1, 1); } } EXPORT_SYMBOL_GPL(scatterwalk_copychunks); -void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, - unsigned int start, unsigned int nbytes, int out) +inline void memcpy_from_scatterwalk(void *buf, struct scatter_walk *walk, + unsigned int nbytes) +{ + do { + const void *src_addr; + unsigned int to_copy; + + src_addr = scatterwalk_next(walk, nbytes, &to_copy); + memcpy(buf, src_addr, to_copy); + scatterwalk_done_src(walk, src_addr, to_copy); + buf += to_copy; + nbytes -= to_copy; + } while (nbytes); +} +EXPORT_SYMBOL_GPL(memcpy_from_scatterwalk); + +inline void memcpy_to_scatterwalk(struct scatter_walk *walk, const void *buf, + unsigned int nbytes) +{ + do { + void *dst_addr; + unsigned int to_copy; + + dst_addr = scatterwalk_next(walk, nbytes, &to_copy); + memcpy(dst_addr, buf, to_copy); + scatterwalk_done_dst(walk, dst_addr, to_copy); + buf += to_copy; + nbytes -= to_copy; + } while (nbytes); +} +EXPORT_SYMBOL_GPL(memcpy_to_scatterwalk); + +void memcpy_from_sglist(void *buf, struct scatterlist *sg, + unsigned int start, unsigned int nbytes) { struct scatter_walk walk; - struct scatterlist tmp[2]; - if (!nbytes) + if (unlikely(nbytes == 0)) /* in case sg == NULL */ return; - sg = scatterwalk_ffwd(tmp, sg, start); + scatterwalk_start_at_pos(&walk, sg, start); + memcpy_from_scatterwalk(buf, &walk, nbytes); +} +EXPORT_SYMBOL_GPL(memcpy_from_sglist); + +void memcpy_to_sglist(struct scatterlist *sg, unsigned int start, + const void *buf, unsigned int nbytes) +{ + struct scatter_walk walk; + + if (unlikely(nbytes == 0)) /* in case sg == NULL */ + return; - scatterwalk_start(&walk, sg); - scatterwalk_copychunks(buf, &walk, nbytes, out); - scatterwalk_done(&walk, out, 0); + scatterwalk_start_at_pos(&walk, sg, start); + memcpy_to_scatterwalk(&walk, buf, nbytes); } -EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy); +EXPORT_SYMBOL_GPL(memcpy_to_sglist); struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2], struct scatterlist *src, unsigned int len) { diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h index 8e83c43016c9d..1689ecd7ddafa 100644 --- a/include/crypto/scatterwalk.h +++ b/include/crypto/scatterwalk.h @@ -168,12 +168,32 @@ static inline void scatterwalk_done_dst(struct scatter_walk *walk, void scatterwalk_skip(struct scatter_walk *walk, unsigned int nbytes); void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, size_t nbytes, int out); -void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, - unsigned int start, unsigned int nbytes, int out); +void memcpy_from_scatterwalk(void *buf, struct scatter_walk *walk, + unsigned int nbytes); + +void memcpy_to_scatterwalk(struct scatter_walk *walk, const void *buf, + unsigned int nbytes); + +void memcpy_from_sglist(void *buf, struct scatterlist *sg, + unsigned int start, unsigned int nbytes); + +void memcpy_to_sglist(struct scatterlist *sg, unsigned int start, + const void *buf, unsigned int nbytes); + +/* In new code, please use memcpy_{from,to}_sglist() directly instead. */ +static inline void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, + unsigned int start, + unsigned int nbytes, int out) +{ + if (out) + memcpy_to_sglist(sg, start, buf, nbytes); + else + memcpy_from_sglist(buf, sg, start, nbytes); +} struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2], struct scatterlist *src, unsigned int len);