From patchwork Sat Mar 8 12:45:23 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Herbert Xu X-Patchwork-Id: 871721 Received: from abb.hmeau.com (abb.hmeau.com [144.6.53.87]) (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 6409B2744E for ; Sat, 8 Mar 2025 12:45:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=144.6.53.87 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741437929; cv=none; b=jpe4qWX04KIRiXgHOgwulY3JbmgE/hK0Ul9Uisrw1n2EBw3wUf1z5dTXDSJ60AkRO3mMWa3Kt6hdbCmRyNE2dt49kshzlYJHK/96iu2p8jbRnCwQf6VqaA89PsC4MxnwEU2lSfosqJqaPl9ARn4Zlhn154E7NNEDj2FPs8siM1Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741437929; c=relaxed/simple; bh=paTGudFEGIoTnfijlsMla3IXBdp0gmfWbEodnoBw/7k=; h=Date:Message-Id:In-Reply-To:References:From:Subject:To:Cc; b=TFyoFm2KGVG0xyBGEcSFg35FJvGvFUx5169rStp2xJWaQnZFGVvketJEZ4YqKjBdCvYNXk/7a4WWfSFquYURi8osOVc3sfj+u2Bza6uBOCYJiHO8Lm0k6cyKL2cTfVi0V8btbLi8B689muIDWmaxZYLRG17MPQtdYGifIqIm8E0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gondor.apana.org.au; spf=pass smtp.mailfrom=gondor.apana.org.au; dkim=pass (2048-bit key) header.d=hmeau.com header.i=@hmeau.com header.b=cOZo84Uk; arc=none smtp.client-ip=144.6.53.87 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gondor.apana.org.au Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gondor.apana.org.au Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=hmeau.com header.i=@hmeau.com header.b="cOZo84Uk" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=hmeau.com; s=formenos; h=Cc:To:Subject:From:References:In-Reply-To:Message-Id:Date: Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=XLQlhAY/2txbdivpVV2RwPAG5NKf5880rbxqDk5bHNA=; b=cOZo84Ukd2szV36Ve9lJOHPN9p MTdU8A5x0gqhAf/J+weEAkrfN+VB1MSivJqVPClKETNQcGxxJ6Jt7QRnQ+Kb/ANFarhOafTtPxFrc SzE/jT5PvziTjh5+Wk1L9znuW7lvEOIqx4rsSu3e6KaVNOjQio48X7ESDKiSAzAZD+S9WWoPSzoOy ao0LzmxrDIE5OqiiOfvgtk0/j0cXZhU5msoFqmTpwCPzRjbLtG4wxbZKgOcm+I8N+pfzXta5hMi4a i+/Jm5FGKoaTJ1PfHEJgbxV+r0vb7TLNdtTG9xDX1wG8OWatSC32Bgpx9/3AOVFNlS6vF+JwG5npV fPP5mcHw==; Received: from loth.rohan.me.apana.org.au ([192.168.167.2]) by formenos.hmeau.com with smtp (Exim 4.96 #2 (Debian)) id 1tqtYR-004r9G-1s; Sat, 08 Mar 2025 20:45:24 +0800 Received: by loth.rohan.me.apana.org.au (sSMTP sendmail emulation); Sat, 08 Mar 2025 20:45:23 +0800 Date: Sat, 08 Mar 2025 20:45:23 +0800 Message-Id: In-Reply-To: References: From: Herbert Xu Subject: [v3 PATCH 2/3] crypto: scatterwalk - Add memcpy_sglist To: Linux Crypto Mailing List Cc: Eric Biggers Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Add memcpy_sglist which copies one SG list to another. Signed-off-by: Herbert Xu --- crypto/scatterwalk.c | 27 +++++++++++++++++++++++++++ include/crypto/scatterwalk.h | 3 +++ 2 files changed, 30 insertions(+) diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c index 20a28c6d94da..8225801488d5 100644 --- a/crypto/scatterwalk.c +++ b/crypto/scatterwalk.c @@ -86,6 +86,33 @@ void memcpy_to_sglist(struct scatterlist *sg, unsigned int start, } EXPORT_SYMBOL_GPL(memcpy_to_sglist); +void memcpy_sglist(struct scatterlist *dst, struct scatterlist *src, + unsigned int nbytes) +{ + struct scatter_walk swalk; + struct scatter_walk dwalk; + + if (unlikely(nbytes == 0)) /* in case sg == NULL */ + return; + + scatterwalk_start(&swalk, src); + scatterwalk_start(&dwalk, dst); + + do { + unsigned int slen, dlen; + unsigned int len; + + slen = scatterwalk_next(&swalk, nbytes); + dlen = scatterwalk_next(&dwalk, nbytes); + len = min(slen, dlen); + memcpy(dwalk.addr, swalk.addr, len); + scatterwalk_done_dst(&dwalk, len); + scatterwalk_done_src(&swalk, len); + nbytes -= len; + } while (nbytes); +} +EXPORT_SYMBOL_GPL(memcpy_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 8523c7591d95..c62f47d04eb1 100644 --- a/include/crypto/scatterwalk.h +++ b/include/crypto/scatterwalk.h @@ -210,6 +210,9 @@ void memcpy_from_sglist(void *buf, struct scatterlist *sg, void memcpy_to_sglist(struct scatterlist *sg, unsigned int start, const void *buf, unsigned int nbytes); +void memcpy_sglist(struct scatterlist *dst, struct scatterlist *src, + 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,