From patchwork Thu Jul 7 11:49:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 12909397 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 7C3C4CCA482 for ; Thu, 7 Jul 2022 11:52:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235492AbiGGLwH (ORCPT ); Thu, 7 Jul 2022 07:52:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55580 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235391AbiGGLwD (ORCPT ); Thu, 7 Jul 2022 07:52:03 -0400 Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0389153D33; Thu, 7 Jul 2022 04:51:59 -0700 (PDT) Received: by mail-wr1-x432.google.com with SMTP id d16so19626743wrv.10; Thu, 07 Jul 2022 04:51:58 -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=++tIUpQtGSkeKjCS0jHLC0PODcc+eo2SODOf2a2LF1M=; b=A53V5STeaTnol4pMhOzEPuKv2y4iLeid1sqRq9e6jYzGWfsZiwJtnmmGunpPNAPt0b b9EC5W1t8FKIqAPiP+d8XwpQi/YZANO+ub6l9RcBUc2nC57FR1GNIEj0Lj/2deNwT6wJ frGuC/DjVxbLgLhaL96tlf8vCdxb6UjG1tBKDIhKY/YqBmK4PfAz1XSUJaEf0DiSbBh8 NPvQ6zY3wRMlXENkhiqBFD6cbAnvnTRm6YynGZ/8z1tt9s+16clnAgjNmxWFB5+bhJE+ IVUqcAM93zbHmGY5DmmjrMHCkLq44q6r/OY0qMrgQBC3I3DX0w0MQUugQ2pZVXViGjus 0IOA== 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=++tIUpQtGSkeKjCS0jHLC0PODcc+eo2SODOf2a2LF1M=; b=PEpQPEFcUQp4c/wZvYYWBxB2w1IGhXbisFSyZY2KovgfU/GME0tjPNmiabkHxMZw+B p9D+akHxgLK+N4JAInuj4LR9Uke3Qf/YT789UENcwt/65KfaqIkGYoKNf/r9/8ZCyOZo 99KTCqsfM3QDzmo0yMZ8qHErYcDNKGNKqCZyBnQdax4OSwJwPZLqGglZaiU/VASxZ+0C bqZFWtiZZpDsGufe1yotXYTNtiEPYMSVl55miihB/lboYzKYudMs0BRQDnr3+yZmamRQ v7RUB4rqMwCz3KdxuF4MutuJfoxhGEef24/Et9xmnzWxAqiJZrlsHl0hZYcoeI5ETE+e DrhA== X-Gm-Message-State: AJIora9yWDC4GmhR+Q8Pej1INgmwJD51WGo/5s6vPoRSZu1oK+PuNo9B P/Nsirg9S5gLnOSZaZzChu1Rf2vSWV0KSnfUz/c= X-Google-Smtp-Source: AGRyM1vCf9z1ZEc+5Tas7+SnDucHB8uJjo8JUvx3cZcEQ7zLw6Adl7taSXYxtdIyIbaz1p+seuKcKw== X-Received: by 2002:adf:dd87:0:b0:21d:6ec4:26b0 with SMTP id x7-20020adfdd87000000b0021d6ec426b0mr15484890wrl.182.1657194718343; Thu, 07 Jul 2022 04:51:58 -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.19.2022.07.07.04.51.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jul 2022 04:51:57 -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 10/27] ipv6/udp: support externally provided ubufs Date: Thu, 7 Jul 2022 12:49:41 +0100 Message-Id: <6d56b7c5ddf8add5b2a887dbd734c060e29ca6b2.1657194434.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Teach ipv6/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/ipv6/ip6_output.c | 44 ++++++++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 13 deletions(-) diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index fc74ce3ed8cc..897ca4f9b791 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1542,18 +1542,35 @@ static int __ip6_append_data(struct sock *sk, rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM)) csummode = CHECKSUM_PARTIAL; - if (flags & MSG_ZEROCOPY && length && sock_flag(sk, SOCK_ZEROCOPY)) { - uarg = msg_zerocopy_realloc(sk, length, skb_zcopy(skb)); - if (!uarg) - return -ENOBUFS; - extra_uref = !skb_zcopy(skb); /* only ref on new uarg */ - if (rt->dst.dev->features & NETIF_F_SG && - csummode == CHECKSUM_PARTIAL) { - paged = true; - zc = true; - } else { - uarg->zerocopy = 0; - skb_zcopy_set(skb, uarg, &extra_uref); + if ((flags & MSG_ZEROCOPY) && length) { + struct msghdr *msg = from; + + if (getfrag == ip_generic_getfrag && msg->msg_ubuf) { + if (skb_zcopy(skb) && msg->msg_ubuf != skb_zcopy(skb)) + return -EINVAL; + + /* Leave uarg NULL if can't zerocopy, callers should + * be able to handle it. + */ + if ((rt->dst.dev->features & NETIF_F_SG) && + csummode == CHECKSUM_PARTIAL) { + paged = true; + zc = true; + uarg = msg->msg_ubuf; + } + } else if (sock_flag(sk, SOCK_ZEROCOPY)) { + uarg = msg_zerocopy_realloc(sk, length, skb_zcopy(skb)); + if (!uarg) + return -ENOBUFS; + extra_uref = !skb_zcopy(skb); /* only ref on new uarg */ + if (rt->dst.dev->features & NETIF_F_SG && + csummode == CHECKSUM_PARTIAL) { + paged = true; + zc = true; + } else { + uarg->zerocopy = 0; + skb_zcopy_set(skb, uarg, &extra_uref); + } } } @@ -1747,13 +1764,14 @@ static int __ip6_append_data(struct sock *sk, err = -EFAULT; goto error; } - } else if (!uarg || !uarg->zerocopy) { + } else if (!zc) { int i = skb_shinfo(skb)->nr_frags; err = -ENOMEM; if (!sk_page_frag_refill(sk, pfrag)) goto error; + skb_zcopy_downgrade_managed(skb); if (!skb_can_coalesce(skb, i, pfrag->page, pfrag->offset)) { err = -EMSGSIZE;