From nobody Mon Feb 9 07:39:38 2026 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) (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 9467B225397; Sun, 25 Jan 2026 03:35:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769312160; cv=none; b=aT2BwSXovNmNpKnykKNySeUolUTbzjQwDooJpULrn72VPyOQ9QPW6OAIy0NJOYnvBu2ETIDMaOQYQ3t9THvZ7ZPjCrocSoOqXj7FgWnQ1c5Znhb2pw2dxi3h4YVcWBzFbbFNBu+1t0Huy+wEbNFat0JvYc8tuVY1PMA/0Tb8Opc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769312160; c=relaxed/simple; bh=70sBRuY0D3jWosg337M/chzngh/qThvgD1lCMLip+1Y=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=W3xOaWWPeOhQNVO+VCPCWBRPygZzQFe0j/opda/EiPIdMhIwuVqvEq3JsM5Y42yyacTtF4+x01++Yu024fQ2PRAopVDBbQqPnEL+NGf1L3W5oo3IiI1IrN7jOHxSBS5m9XsIupDdzPCWwks3uhUe4RGOmJZfNQs44KRm/Chw7/E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=kxOIXE0B; arc=none smtp.client-ip=192.198.163.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="kxOIXE0B" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1769312158; x=1800848158; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=70sBRuY0D3jWosg337M/chzngh/qThvgD1lCMLip+1Y=; b=kxOIXE0BHjj97Dxbt2TM0Wn+o3JERZG7IjUr9fGNcf5Ry/57rXKQ6VGa v/MmYzDXRJa1IX/ZtAHoem0GxHxlX5hCseQ2MOCAhbEL+Yy4m3XNBRQnn 3Pdpvp58zrpiQNyMLwMved2UNQR8h4R9cF5ktt2Qwpjwj38sW0fk3MWd9 4KwKBDMdvAf2e/hKTme5R/CXXr2Edd7DpEVCQq3Gny8/ecq8Qs+rQLLAt Mra0l0jJm7YYbTwRtWlT4lb07o+KNhqyhm3vUyWu0Lg/K9jEjTA/ttkXr t+MszXVBUZ+BXB7qijUjt9x0NDLCBPLfKN83eTxpa/widERe79vwuJlUv w==; X-CSE-ConnectionGUID: 4KWdrViwR3eh5qmpz4Om4g== X-CSE-MsgGUID: n67kYFXKRwy/oY/7k91QJg== X-IronPort-AV: E=McAfee;i="6800,10657,11681"; a="81887494" X-IronPort-AV: E=Sophos;i="6.21,252,1763452800"; d="scan'208";a="81887494" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jan 2026 19:35:58 -0800 X-CSE-ConnectionGUID: QrFMYZo2Qt2H6QcH3tF6aA== X-CSE-MsgGUID: QBjoQZT8TKWWSVQKfQakGw== X-ExtLoop1: 1 Received: from jf5300-b11a338t.jf.intel.com ([10.242.51.115]) by fmviesa003.fm.intel.com with ESMTP; 24 Jan 2026 19:35:56 -0800 From: Kanchana P Sridhar To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, hannes@cmpxchg.org, yosry.ahmed@linux.dev, nphamcs@gmail.com, chengming.zhou@linux.dev, usamaarif642@gmail.com, ryan.roberts@arm.com, 21cnbao@gmail.com, ying.huang@linux.alibaba.com, akpm@linux-foundation.org, senozhatsky@chromium.org, sj@kernel.org, kasong@tencent.com, linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net, clabbe@baylibre.com, ardb@kernel.org, ebiggers@google.com, surenb@google.com, kristen.c.accardi@intel.com, vinicius.gomes@intel.com, giovanni.cabiddu@intel.com Cc: wajdi.k.feghali@intel.com, kanchana.p.sridhar@intel.com Subject: [PATCH v14 13/26] crypto: acomp - Define a unit_size in struct acomp_req to enable batching. Date: Sat, 24 Jan 2026 19:35:24 -0800 Message-Id: <20260125033537.334628-14-kanchana.p.sridhar@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20260125033537.334628-1-kanchana.p.sridhar@intel.com> References: <20260125033537.334628-1-kanchana.p.sridhar@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" mm: zswap: Set the unit size for zswap to PAGE_SIZE. We add a new @unit_size data member to struct acomp_req along with a helper function acomp_request_set_unit_size() for kernel modules to set the unit size to use while breaking down the request's src/dst scatterlists. An acomp_alg can implement batching by using the @req->unit_size to break down the SG lists passed in via @req->dst and/or @req->src, to submit individual @req->slen/@req->unit_size compress jobs or @req->dlen/@req->unit_size decompress jobs, for batch compression and batch decompression respectively. In case of batch compression, the folio's pages for the batch can be retrieved from the @req->src scatterlist by using a struct sg_page_iter after determining the number of pages as @req->slen/@req->unit_size. 1) acomp_request_set_callback() sets the @req->unit_size to 0. 2) In zswap_cpu_comp_prepare(), after the call to acomp_request_set_callback(), we call: acomp_request_set_unit_size(acomp_ctx->req, PAGE_SIZE); to set the unit size for zswap to PAGE_SIZE. Suggested-by: Herbert Xu Signed-off-by: Kanchana P Sridhar Signed-off-by: Herbert Xu --- include/crypto/acompress.h | 48 ++++++++++++++++++++++++++++++++++++++ mm/zswap.c | 3 +++ 2 files changed, 51 insertions(+) diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h index 9eacb9fa375d..23a1a659843c 100644 --- a/include/crypto/acompress.h +++ b/include/crypto/acompress.h @@ -79,6 +79,7 @@ struct acomp_req_chain { * @dvirt: Destination virtual address * @slen: Size of the input buffer * @dlen: Size of the output buffer and number of bytes produced + * @unit_size: Unit size for the request for use in batching * @chain: Private API code data, do not use * @__ctx: Start of private context data */ @@ -94,6 +95,7 @@ struct acomp_req { }; unsigned int slen; unsigned int dlen; + unsigned int unit_size; =20 struct acomp_req_chain chain; =20 @@ -328,9 +330,55 @@ static inline void acomp_request_set_callback(struct a= comp_req *req, { flgs &=3D ~CRYPTO_ACOMP_REQ_PRIVATE; flgs |=3D req->base.flags & CRYPTO_ACOMP_REQ_PRIVATE; + req->unit_size =3D 0; crypto_request_set_callback(&req->base, flgs, cmpl, data); } =20 +/** + * acomp_request_set_unit_size() -- Sets the unit size for the request. + * + * This is a helper function that enables batching for zswap, IPComp, etc. + * It allows multiple independent compression (or decompression) operation= s to + * be submitted in a single request's SG lists, where each SG list ("segme= nt") + * is processed independently. The unit size helps derive segments from a + * single request. crypto_acomp does not expect the segments to be related= in + * any way. + * + * Example usage model: + * + * A module such as zswap that's configured to use a batching compressor, = can + * accomplish batch compression of "nr_pages" with crypto_acomp by creatin= g an + * output SG table for the batch, initialized to contain "nr_pages" SG + * lists. Each scatterlist is mapped to the nth destination buffer for the + * batch. Depending on whether the @req is used for batch compress/decompr= ess, + * zswap must set the @req's source/destination length to be + * "nr_pages * @req->unit_size" respectively. + * + * An acomp_alg can implement batch compression by using the @req->unit_si= ze + * to break down the SG lists passed in via @req->dst to submit individual + * "@req->slen/@req->unit_size" compress jobs to be processed as a batch. + * + * Similarly, zswap can implement batch decompression by passing an + * SG table with "nr_pages" SG lists via @req->src to process + * "@req->dlen/@req->unit_size" decompress jobs as a batch. + * + * This API must be called after acomp_request_set_callback(), + * which sets @req->unit_size to 0. This makes it easy for users of + * crypto_acomp to rely on a default of not opting in to batching. + * Users such as zswap opt in to batching by defining @req->unit_size + * to a non-zero value for use by acomp_algs supporting batching. + * + * @du would be PAGE_SIZE for zswap, it could be the MTU for IPsec. + * + * @req: asynchronous compress/decompress request + * @du: data unit size of the input/output buffer scatterlist. + */ +static inline void acomp_request_set_unit_size(struct acomp_req *req, + unsigned int du) +{ + req->unit_size =3D du; +} + /** * acomp_request_set_params() -- Sets request parameters * diff --git a/mm/zswap.c b/mm/zswap.c index a3811b05ab57..038e240c03dd 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -781,6 +781,9 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, str= uct hlist_node *node) acomp_ctx->buffer =3D buffer; acomp_ctx->acomp =3D acomp; acomp_ctx->req =3D req; + + acomp_request_set_unit_size(acomp_ctx->req, PAGE_SIZE); + mutex_unlock(&acomp_ctx->mutex); return 0; =20 --=20 2.27.0