From patchwork Tue Dec 4 01:52:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sagi Grimberg X-Patchwork-Id: 10711043 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D8FDB15A6 for ; Tue, 4 Dec 2018 01:54:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CC5872AA76 for ; Tue, 4 Dec 2018 01:54:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C02152AB2C; Tue, 4 Dec 2018 01:54:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 548F32AA76 for ; Tue, 4 Dec 2018 01:54:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726088AbeLDBx5 (ORCPT ); Mon, 3 Dec 2018 20:53:57 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:39036 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726041AbeLDBwV (ORCPT ); Mon, 3 Dec 2018 20:52:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From: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=1xaWj2DkSruQXBA0LceZdeUUzKkF1j3gtF+8ajMkIng=; b=NXYQQ7ZO4wtBmZY2tF19CwKif nf9JgZyv/ONW9YpAoPSCOG8GOlP7ftTxW/Wn9hjWlFtH5Cuks/MMEvOpLaTDUwyQOYr8TrnR59d+d N4R0gDk8WnAER34MNlvGliDV24MXvDWz9mDT95R8ATGe/1ptQ/SvdEqCmcwdkrlLk+FR2q39/IQRf F8tcdLM7kdnxfIelvYjWftIvxL2Qr+skOuf3VxURRaV9lk8hhhd36AfwT/U17CUlUx6CJksLsA0qs iXJP0Z9XGiTfq5uK7Zo/b3hyENZq+loPK94oIfig1KcDylvROedp0cMlHFB7qHrWC6QZIp7hynxlp mX11FexnA==; Received: from [2600:1700:65a0:78e0:514:7862:1503:8e4d] (helo=sagi-Latitude-E7470.lbits) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1gTzsq-0003Zq-Q4; Tue, 04 Dec 2018 01:52:20 +0000 From: Sagi Grimberg To: linux-nvme@lists.infradead.org Cc: linux-block@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , Keith Busch , "David S. Miller" Subject: [PATCH v5 05/13] iov_iter: introduce hash_and_copy_to_iter helper Date: Mon, 3 Dec 2018 17:52:09 -0800 Message-Id: <20181204015217.16613-6-sagi@grimberg.me> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181204015217.16613-1-sagi@grimberg.me> References: <20181204015217.16613-1-sagi@grimberg.me> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sagi Grimberg Allow consumers that want to use iov iterator helpers and also update a predefined hash calculation online when copying data. This is useful when copying incoming network buffers to a local iterator and calculate a digest on the incoming stream. nvme-tcp host driver that will be introduced in following patches is the first consumer via skb_copy_and_hash_datagram_iter. Acked-by: David S. Miller Signed-off-by: Sagi Grimberg --- include/linux/uio.h | 3 +++ lib/iov_iter.c | 16 ++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/uio.h b/include/linux/uio.h index 41d1f8d3313d..ecf584f6b82d 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -11,6 +11,7 @@ #include #include +#include #include struct page; @@ -269,6 +270,8 @@ static inline void iov_iter_reexpand(struct iov_iter *i, size_t count) size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump, struct iov_iter *i); size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); +size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp, + struct iov_iter *i); int import_iovec(int type, const struct iovec __user * uvector, unsigned nr_segs, unsigned fast_segs, diff --git a/lib/iov_iter.c b/lib/iov_iter.c index db93531ca3e3..8a5f7b2ae346 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -6,6 +6,7 @@ #include #include #include +#include #define PIPE_PARANOIA /* for now */ @@ -1475,6 +1476,21 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump, } EXPORT_SYMBOL(csum_and_copy_to_iter); +size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp, + struct iov_iter *i) +{ + struct ahash_request *hash = hashp; + struct scatterlist sg; + size_t copied; + + copied = copy_to_iter(addr, bytes, i); + sg_init_one(&sg, addr, copied); + ahash_request_set_crypt(hash, &sg, NULL, copied); + crypto_ahash_update(hash); + return copied; +} +EXPORT_SYMBOL(hash_and_copy_to_iter); + int iov_iter_npages(const struct iov_iter *i, int maxpages) { size_t size = i->count;