From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81145C43334 for ; Sun, 12 Jun 2022 09:00:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235377AbiFLJA5 (ORCPT ); Sun, 12 Jun 2022 05:00:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39862 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235279AbiFLJAr (ORCPT ); Sun, 12 Jun 2022 05:00:47 -0400 Received: from mail-wm1-x336.google.com (mail-wm1-x336.google.com [IPv6:2a00:1450:4864:20::336]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 106AA51E4E for ; Sun, 12 Jun 2022 02:00:44 -0700 (PDT) Received: by mail-wm1-x336.google.com with SMTP id x6-20020a1c7c06000000b003972dfca96cso1602097wmc.4 for ; Sun, 12 Jun 2022 02:00:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fastly.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Bh+5cvdXh3nnzozHNpzUlua2s6tISLW0nqJPvBVheEw=; b=RDUvhVt18U9J3OuMRKOCldFZ/tV2MGuKPzdMcLjIrxSpqqnq3EPnIHWGXU+6Oj4Mb3 6bTxjUXe+5kYOwV/kL6w/Uz7Hj9SlihPEFvEIEHwyoV9mrw3YjFF2T8E6f8J4Y3U3y99 S+cOMnUr2QKpBEtWXolUFuV7ZwjBp4xwLsiPg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Bh+5cvdXh3nnzozHNpzUlua2s6tISLW0nqJPvBVheEw=; b=s4oNlmYmi3fCSxLCFlwtUp0Wpw83sLb4ZdYXgoOmzG4lSqOnKcc5TUn1WjFO+Fj1ie mmVFZXriXCruK1vy0zvFz6L9knVZ29pGGI8WMOixyxTVUTW/ptJEOcRTe+EO5Nul65Le kC4bjmqRUzUzWk4+YUvhN2JLhuCyd7N0jWkh4Wd7F/YU6116SlVyYPadvxV0MTSXhBBD fNkJfholmirkhmCDfmiprlUgvNEZnaQqNCtOUu7jsJ9g8AN4WRqwkpuIHyXjy0riVo60 ZQaiuQLurPMkBTPB2m4mIndBVWl4DvErUMmKP2IHHQ+mptvvk8kcmdY2HJ2n0vixWqyH mEKw== X-Gm-Message-State: AOAM533zoKMLhzgIHYxxd+W1ki/YY9KTt+mN9UunwErYRBGLi+BqtXPa yv9C3FIk6NMtb21cMiAskKi6/h8ztHkiSukDjwR939rFGIuXhkUbLrM3KOZ7O7S5VLaHaWksoNB lI8xyJWp2gwfGGQDS1T3+wKs+4xjs1kfOlfb4WghsezwMrJ5/3gL5pS1GIl6zaythH65AhibTb/ BA X-Google-Smtp-Source: ABdhPJzHwiWJn0Q5mqMHXp5JXd4bsJvT8DXD1tByMG5tzxXc8u3ebIVE9ktGcRLM0xx+cGfJp2Oycw== X-Received: by 2002:a05:600c:58a:b0:39c:80ed:68be with SMTP id o10-20020a05600c058a00b0039c80ed68bemr8304657wmd.150.1655024442341; Sun, 12 Jun 2022 02:00:42 -0700 (PDT) Received: from localhost.localdomain ([178.130.153.185]) by smtp.gmail.com with ESMTPSA id d34-20020a05600c4c2200b0039c5b4ab1b0sm4798603wmp.48.2022.06.12.02.00.40 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 12 Jun 2022 02:00:41 -0700 (PDT) From: Joe Damato To: linux-kernel@vger.kernel.org Cc: Joe Damato Subject: [RFC,net-next v2 4/8] net: Add MSG_NTCOPY sendmsg flag Date: Sun, 12 Jun 2022 01:57:53 -0700 Message-Id: <1655024280-23827-5-git-send-email-jdamato@fastly.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1655024280-23827-1-git-send-email-jdamato@fastly.com> References: <1655024280-23827-1-git-send-email-jdamato@fastly.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add MSG_NTCOPY so that user applications can ask the kernel for a non-temporal copy when copying data into the kernel for TX. A simple helper is provided to set the iovec iterator copy type if MSG_NTCOPY is set. Signed-off-by: Joe Damato --- include/linux/socket.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/socket.h b/include/linux/socket.h index 17311ad..98cb735 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -318,6 +318,7 @@ struct ucred { * plain text and require encryption */ +#define MSG_NTCOPY 0x2000000 /* Use a non-temporal copy */ #define MSG_ZEROCOPY 0x4000000 /* Use user data in kernel path */ #define MSG_FASTOPEN 0x20000000 /* Send data in TCP SYN */ #define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exec for file @@ -378,6 +379,14 @@ struct ucred { extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr); extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data); +static inline void msg_set_iter_copy_type(struct msghdr *msg) +{ + if (msg->msg_flags & MSG_NTCOPY) + msg->msg_iter.iter_copy_type = ITER_NOCACHE_COPY; + else + msg->msg_iter.iter_copy_type = ITER_COPY; +} + struct timespec64; struct __kernel_timespec; struct old_timespec32; -- 2.7.4