From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: * X-Spam-Status: No, score=1.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_SOFTFAIL autolearn=no autolearn_force=no version=3.4.6 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D584C433EF for ; Tue, 5 Jul 2022 15:02:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230381AbiGEPCj (ORCPT ); Tue, 5 Jul 2022 11:02:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52932 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232410AbiGEPCO (ORCPT ); Tue, 5 Jul 2022 11:02:14 -0400 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B42515FF2; Tue, 5 Jul 2022 08:02:01 -0700 (PDT) Received: by mail-wr1-x436.google.com with SMTP id v14so17965305wra.5; Tue, 05 Jul 2022 08:02:01 -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=GzLsAsxy95Fx76UEZFPuQaGwMf2vIR+G+ARPeYpyXs4=; b=UtZqPl6VuQcFKVyoE0m4M/ucDCoYfxGDoydFFTFdz8JcqeSF5qHI56kr0FmSCRmKQV Y05fIA5HjqzAilH2s3+vQTKL8iweuJoqI1X6qyQVBvh0RrhBouebHr9CA0a/fRau3cz3 fE4hjvSdDLe2lrc+ce78EouI3mDI3sONIS0l1Qq8lxkoOesTg5SPX3tjyRbj1WYbT7jX zKNPxJ/q7T8pTNf7Z4icOTZfjOn/DBxelt/9z3uUf3GkOsaSlWfavoEDrzYF3U8SN8Rr 3eJPo8sjGIcyWgiMo7ZqkzoIkCBKM8HfxRwT9C899dG3YBzlzvP5aMKPZ6oNN+p+GdBY SNvg== 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=GzLsAsxy95Fx76UEZFPuQaGwMf2vIR+G+ARPeYpyXs4=; b=xHVGyNFS4bHobXWdxl/5o3Fs91XYie2TSmNxwLESLBUm9T3lA7xP5PMpv6UHKM0Kc2 /YF3BqIU2xkjiEsTxX73mK8Z71CyNEXIrPMbrOEeL7+wqFy5tq8qmpplrX0mNYwreOo2 zw9s9JLV8Vedn6e0XTDxzx7r/Pt0ukhod/AqQ68O1GDs8cOsxHfF5MSdBjdcKUmJgGzy psY5WRBUNvAgx67tlFzajUHQH3p3J4yaNCSqr/YUUsHRvQeo55mV6AgWYA+s6thkgdJ2 BmYED5Wr5vC7oYbgou0KI7HMjnQt+Ge82c214KnMxME7VilRyCs93YEs+BphRU7yxqsx reAQ== X-Gm-Message-State: AJIora/VkQydiLvUwD6nSrORbLFgKK3ooYDvFpMuDdWUlk2ncUTsQyhH yYGTTYUuYUSAIuTikovwGV340WADbM7A4A== X-Google-Smtp-Source: AGRyM1uLLTELWeUDiGk8a+3owFmoMQvgcLMkMVHcxwokk6AYmB+pAUhin1uHsB1AHeKR5c0qfvcZsA== X-Received: by 2002:a05:6000:1861:b0:21b:a8a2:858d with SMTP id d1-20020a056000186100b0021ba8a2858dmr33600051wri.53.1657033319713; Tue, 05 Jul 2022 08:01:59 -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 k27-20020adfd23b000000b0021d728d687asm2518200wrh.36.2022.07.05.08.01.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Jul 2022 08:01:59 -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 v3 10/25] ipv6/udp: support zc with managed data Date: Tue, 5 Jul 2022 16:01:10 +0100 Message-Id: <74c0f3cf7ff2464b0025a590ce9e716adb350be7.1656318994.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: io-uring@vger.kernel.org Just as with ipv4/udp make ipv6/udp to take advantage of managed data and propagate SKBFL_MANAGED_FRAG_REFS to skb_zerocopy_iter_dgram(). Signed-off-by: Pavel Begunkov --- net/ipv6/ip6_output.c | 57 ++++++++++++++++++++++++++++++++----------- 1 file changed, 43 insertions(+), 14 deletions(-) diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index fc74ce3ed8cc..34eb3b5da5e2 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; @@ -1778,7 +1796,18 @@ static int __ip6_append_data(struct sock *sk, skb->truesize += copy; wmem_alloc_delta += copy; } else { - err = skb_zerocopy_iter_dgram(skb, from, copy); + struct msghdr *msg = from; + + if (!skb_shinfo(skb)->nr_frags) { + if (msg->msg_managed_data) + skb_shinfo(skb)->flags |= SKBFL_MANAGED_FRAG_REFS; + } else { + /* appending, don't mix managed and unmanaged */ + if (!msg->msg_managed_data) + skb_zcopy_downgrade_managed(skb); + } + + err = skb_zerocopy_iter_dgram(skb, msg, copy); if (err < 0) goto error; } -- 2.36.1