From patchwork Sun Jun 13 14:43:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Taehee Yoo X-Patchwork-Id: 459710 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 319B7C48BCF for ; Sun, 13 Jun 2021 14:44:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08A0A610A1 for ; Sun, 13 Jun 2021 14:44:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231933AbhFMOqM (ORCPT ); Sun, 13 Jun 2021 10:46:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58398 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231794AbhFMOqJ (ORCPT ); Sun, 13 Jun 2021 10:46:09 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C41CFC061574 for ; Sun, 13 Jun 2021 07:43:56 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id o9so6632243pgd.2 for ; Sun, 13 Jun 2021 07:43:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=admH69WwWHg/51d+9NCBP6U2S76mlrc/E9mDIfezmhc=; b=cNBWazbep2rGuZmbRsWIBmKf7I3tlGzGUEvRyeargVpfK8zwxo89x9A0Z5f7PE9jK6 FV/VlEsu04EceHps4s/X1BmdL+PaobVtWTEq7/V1yTbwJ4baaDvF2fZCYs1TKTaE1ofo LxiwSlCmSlre7xompKD8BBqr8QG/6lGhdIl+q3hK/XjyjtWuJNmjmxegGvQmm3B3dsYR ylKCSI4yoMhTkTvVqRuYkUiiTl2d4NOrykW6zmYLDHD8Taif2Fzo9dEgDmgEZESkRDd8 Q/SXc+WMpWbOaW3tD+SQe3RXzpOVZvSCGfSxYDGwWueBekyvvQdAkNtpSJDHA4ADc3IU uGyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=admH69WwWHg/51d+9NCBP6U2S76mlrc/E9mDIfezmhc=; b=sDR4odp3Ke/HqWNlfQS2qiyoItvVQSPDGfveMIAj5kJu3PBd+DyC4QLXjwDl+KvniA Mf4qgeBZJrciJboQWgyr1Khwlj4zKnM+i4B9D0XcXMXpYZtk6NAuaWhMSWZ25y+ZiGZB O6juRx9HY2I9wah6F5eLd3BbzjN1PyDyExMka5vWyg9Q1VUXZdMlOxRt9X1qypzGK+Re O5iJYeFqzZcNOF6Lnvdox9M/CcqY3aRHuSK8r5gH3ZcrMKUF36UG4w/8wGy+15GZnZQB BX95/6OSV2824Kl9lAzjtfycrDfosF1vqKYnxxOuWhltfIfLFw3Qy1tRDlFc93Ri62Kz uwEA== X-Gm-Message-State: AOAM531l/884hAU199nC+JK6K1bmMnVmSxUTv+algOgnGIOBaMi3w4QD FYrFrQUx0NM0yZDgBrq/2TY= X-Google-Smtp-Source: ABdhPJz4F6UsvlYV0SRjipg+F2QeHCg8Yo7gVcm/hiFK+10nSZky5wbN6akQqsUB6EXJn2pUqvBQVA== X-Received: by 2002:a05:6a00:d65:b029:2ec:2bfa:d0d1 with SMTP id n37-20020a056a000d65b02902ec2bfad0d1mr17630963pfv.14.1623595436156; Sun, 13 Jun 2021 07:43:56 -0700 (PDT) Received: from localhost.localdomain ([49.173.165.50]) by smtp.gmail.com with ESMTPSA id e21sm9632676pjh.55.2021.06.13.07.43.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Jun 2021 07:43:55 -0700 (PDT) From: Taehee Yoo To: davem@davemloft.net, kuba@kernel.org, dsahern@kernel.org, yoshfuji@linux-ipv6.org, netdev@vger.kernel.org, eric.dumazet@gmail.com Cc: ap420073@gmail.com Subject: [PATCH net-next] mld: avoid unnecessary high order page allocation in mld_newpack() Date: Sun, 13 Jun 2021 14:43:44 +0000 Message-Id: <20210613144344.31311-1-ap420073@gmail.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org If link mtu is too big, mld_newpack() allocates high-order page. But most mld packets don't need high-order page. So, it might waste unnecessary pages. To avoid this, it makes mld_newpack() try to allocate order-0 page. Suggested-by: Eric Dumazet Signed-off-by: Taehee Yoo --- net/ipv6/mcast.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index d36ef9d25e73..54ec163fbafa 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -1729,22 +1729,25 @@ static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) { + u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, + 2, 0, 0, IPV6_TLV_PADN, 0 }; struct net_device *dev = idev->dev; - struct net *net = dev_net(dev); - struct sock *sk = net->ipv6.igmp_sk; - struct sk_buff *skb; - struct mld2_report *pmr; - struct in6_addr addr_buf; - const struct in6_addr *saddr; int hlen = LL_RESERVED_SPACE(dev); int tlen = dev->needed_tailroom; - unsigned int size = mtu + hlen + tlen; + struct net *net = dev_net(dev); + const struct in6_addr *saddr; + struct in6_addr addr_buf; + struct mld2_report *pmr; + struct sk_buff *skb; + unsigned int size; + struct sock *sk; int err; - u8 ra[8] = { IPPROTO_ICMPV6, 0, - IPV6_TLV_ROUTERALERT, 2, 0, 0, - IPV6_TLV_PADN, 0 }; - /* we assume size > sizeof(ra) here */ + sk = net->ipv6.igmp_sk; + /* we assume size > sizeof(ra) here + * Also try to not allocate high-order pages for big MTU + */ + size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; skb = sock_alloc_send_skb(sk, size, 1, &err); if (!skb) return NULL;