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 E5D24C43334 for ; Thu, 7 Jul 2022 11:52:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235575AbiGGLwl (ORCPT ); Thu, 7 Jul 2022 07:52:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235476AbiGGLwE (ORCPT ); Thu, 7 Jul 2022 07:52:04 -0400 Received: from mail-wm1-x331.google.com (mail-wm1-x331.google.com [IPv6:2a00:1450:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 19564564C0; Thu, 7 Jul 2022 04:52:01 -0700 (PDT) Received: by mail-wm1-x331.google.com with SMTP id m6-20020a05600c3b0600b003a0489f412cso795450wms.1; Thu, 07 Jul 2022 04:52:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=530Kj9fyhb4BAaf8FxSCXZ47V34wdCD15bBkxNyM1cg=; b=Xf4aZke/gjdB271cikF+a8GkXtrb/Sa9rjGTmUxWDuPpGwXHnBkR17Nn9l4GWAAAvf yhw6X/L/dDh8xOXl80GBKjiPISyAW6J8Ez+9183rxiBqcFSezxJsFtMSNGR9q7UDfhq5 vkCbXEtvCXrXVqc4EA0RHmr4Gp9vMacJ9KcL5BgoYAVWn6Pnqy3bPgCOIQNhSCfspnIU e5WAxf22gSS8xlg/dQHgsA5M/pjSXWZsivseN4AnlP1BCViNg/z5AiUlF3yjc61DQeQu RWGlg19lv/9wLkATHYj6wjhgF4W893Z1WeM2q6F6tOLPNDYvqgqGlb5b1fJVyrhAjgE2 WoLQ== 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:mime-version:content-transfer-encoding; bh=530Kj9fyhb4BAaf8FxSCXZ47V34wdCD15bBkxNyM1cg=; b=8C8VsN4uRfrpgzt/w+pSf5j2qB06cjTYC+MWRIvETDKSAhpEFQR8uAXDPCg8vITscm Kw506kmMJtmMyeb75KrxMsz44tIBZrswQyu7I02GOAuwAdtt9AV5slim3muCPXpe74/v BgaBBG81yr151IFV7aW+Pnk0iTqbZZCBnmPCorJNipV9+Uy88fc5V8P+5rJiXu0TErgD o7pHcS/rmBKBpwGGjth+LP6DbsGVP8VNdN3dA5U/QJpbvQRkFZmqm9PA8j2d7iOmPNRR wL3GGj7AzNzODByCIpjyrNae6zil6pAZGv78DJyBqWjfVY0jdVgdvVcWcS7nigrGudXR Z1kQ== X-Gm-Message-State: AJIora+Qs9Ue/ceG7yMMCMqTqWRwQ3TxNhWVg025yb7GnYUe+7iyoo/h lN2klfdn3Wg497onGNywIJ74LjN3IfUhAv1J74E= X-Google-Smtp-Source: AGRyM1uxnz3sxBaRDQ+35wnzIv5JZeO0SprLs2j7hkwtj6mhvk4MLcZL9rMqeDsQfLfKrG73a/VP3g== X-Received: by 2002:a05:600c:1ca9:b0:3a0:43a9:5e1a with SMTP id k41-20020a05600c1ca900b003a043a95e1amr3881477wms.155.1657194719419; Thu, 07 Jul 2022 04:51:59 -0700 (PDT) Received: from 127.0.0.1localhost (188.28.125.106.threembb.co.uk. [188.28.125.106]) by smtp.gmail.com with ESMTPSA id u2-20020a5d5142000000b0021b966abc19sm37982131wrt.19.2022.07.07.04.51.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jul 2022 04:51:59 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "David S . Miller" , Jakub Kicinski , Jonathan Lemon , Willem de Bruijn , Jens Axboe , David Ahern , kernel-team@fb.com, Pavel Begunkov Subject: [PATCH net-next v4 11/27] tcp: support externally provided ubufs Date: Thu, 7 Jul 2022 12:49:42 +0100 Message-Id: <7ee05f644e3b3626b693973738364bcb23cf905d.1657194434.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Teach ipv4/udp how to use external ubuf_info provided in msghdr and also prepare it for managed frags by sprinkling skb_zcopy_downgrade_managed() when it could mix managed and not managed frags. Signed-off-by: Pavel Begunkov --- net/ipv4/tcp.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 390eb3dc53bd..a81f694af5e9 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1223,17 +1223,23 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size) flags = msg->msg_flags; - if (flags & MSG_ZEROCOPY && size && sock_flag(sk, SOCK_ZEROCOPY)) { + if ((flags & MSG_ZEROCOPY) && size) { skb = tcp_write_queue_tail(sk); - uarg = msg_zerocopy_realloc(sk, size, skb_zcopy(skb)); - if (!uarg) { - err = -ENOBUFS; - goto out_err; - } - zc = sk->sk_route_caps & NETIF_F_SG; - if (!zc) - uarg->zerocopy = 0; + if (msg->msg_ubuf) { + uarg = msg->msg_ubuf; + net_zcopy_get(uarg); + zc = sk->sk_route_caps & NETIF_F_SG; + } else if (sock_flag(sk, SOCK_ZEROCOPY)) { + uarg = msg_zerocopy_realloc(sk, size, skb_zcopy(skb)); + if (!uarg) { + err = -ENOBUFS; + goto out_err; + } + zc = sk->sk_route_caps & NETIF_F_SG; + if (!zc) + uarg->zerocopy = 0; + } } if (unlikely(flags & MSG_FASTOPEN || inet_sk(sk)->defer_connect) && @@ -1356,9 +1362,11 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size) copy = min_t(int, copy, pfrag->size - pfrag->offset); - if (tcp_downgrade_zcopy_pure(sk, skb)) - goto wait_for_space; - + if (unlikely(skb_zcopy_pure(skb) || skb_zcopy_managed(skb))) { + if (tcp_downgrade_zcopy_pure(sk, skb)) + goto wait_for_space; + skb_zcopy_downgrade_managed(skb); + } copy = tcp_wmem_schedule(sk, copy); if (!copy) goto wait_for_space; -- 2.36.1