From patchwork Thu Mar 10 05:46:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Dumazet X-Patchwork-Id: 12775937 X-Patchwork-Delegate: kuba@kernel.org 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 A4857C433F5 for ; Thu, 10 Mar 2022 05:47:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239637AbiCJFsm (ORCPT ); Thu, 10 Mar 2022 00:48:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51096 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239646AbiCJFsX (ORCPT ); Thu, 10 Mar 2022 00:48:23 -0500 Received: from mail-pg1-x532.google.com (mail-pg1-x532.google.com [IPv6:2607:f8b0:4864:20::532]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A729B12E148 for ; Wed, 9 Mar 2022 21:47:22 -0800 (PST) Received: by mail-pg1-x532.google.com with SMTP id o26so3841756pgb.8 for ; Wed, 09 Mar 2022 21:47:22 -0800 (PST) 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=Eo3id4mltdS6nMy0F8ZyU5fXOpJVIISYbsPHwatxSno=; b=j11Puk6hcPGnQFLogjNiZEDsaooFUewQEz6ZaONpcZ8aCCW0vLujPCsILDMoHQgctV cpFIKAznuFJcRCab6kRqqfbjXWq0488l89ntnIIBTt0kCKbZ02ycWFLhysZZuMA8XSwq It95DIOiYFBQB2zm4nqMkHoQ6OTVnHX0D2Maw+TbqoeXX1b+EDugzzCSzBt4u7IodOZy iYof4+SJ8quWUaRQcHQYctKrnjoyzpz1te9e9aRwPFWCk7rbWqUHcbnP13HV1la9r8Wa Quto96hARc4fdXG/vqRGLpILXX695xG/mkL3Cri+Q1+1yUIs40qgAoBkl+HACSQWa3yy zclA== 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=Eo3id4mltdS6nMy0F8ZyU5fXOpJVIISYbsPHwatxSno=; b=pIxCe6ifoCvKx+d1l8MaO2ORlvjlKFN7/UZegjMi5tx2+gYmxHW2c844ONglYCXSAm 1Yoailzk+Nmg/h397seEz8pBu4+D2os39YBVaB+XFNf3ffo8LPJvEeQDgBw2fa3yuqmE JlynhYkMQ81Eg6py1zGHYGdx/ksFhkNbluZO0QMHK6r07grmEsxrJkSBTHbcEOt4F6es Es88VcQPFkZIgMpBl82uqG8JnsCdBCB0xb4tLRjNtzuTLG6popr/7BYFz549cisYmrV6 WC+Y238GCUiXAZe1B2yYKguRichhWYDcBWP83p74S2jmAZ9BqUA8+kO+hOtVktQyYRP9 5/rw== X-Gm-Message-State: AOAM5304gPPR6O7Nn0L8HV0EV+F92VIJ4Xs5HJ+0941FbYfT0zvoxj1k qnogsQjhA6z9G1pmBFRX+aQ= X-Google-Smtp-Source: ABdhPJwO14p+YV4a+W3Lnn8VMmJwpThdT6kDtKqNRn7m0VmOkAkqsSCp4088/UWXf9YXT1u8z6Wcaw== X-Received: by 2002:a05:6a00:1687:b0:4e1:45d:3ded with SMTP id k7-20020a056a00168700b004e1045d3dedmr3185637pfc.0.1646891242147; Wed, 09 Mar 2022 21:47:22 -0800 (PST) Received: from edumazet1.svl.corp.google.com ([2620:15c:2c4:201:c6c7:6f77:9634:183c]) by smtp.gmail.com with ESMTPSA id 16-20020a056a00073000b004dfe2217090sm5270779pfm.200.2022.03.09.21.47.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Mar 2022 21:47:21 -0800 (PST) From: Eric Dumazet To: "David S . Miller" , Jakub Kicinski Cc: netdev , Alexander Duyck , Coco Li , Eric Dumazet , Eric Dumazet Subject: [PATCH v4 net-next 07/14] ipv6: add GRO_IPV6_MAX_SIZE Date: Wed, 9 Mar 2022 21:46:56 -0800 Message-Id: <20220310054703.849899-8-eric.dumazet@gmail.com> X-Mailer: git-send-email 2.35.1.616.g0bdcbb4464-goog In-Reply-To: <20220310054703.849899-1-eric.dumazet@gmail.com> References: <20220310054703.849899-1-eric.dumazet@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Coco Li Enable GRO to have IPv6 specific limit for max packet size. This patch introduces new dev->gro_ipv6_max_size that is modifiable through ip link. ip link set dev eth0 gro_ipv6_max_size 185000 Note that this value is only considered if bigger than gro_max_size, and for non encapsulated TCP/ipv6 packets. Signed-off-by: Coco Li Signed-off-by: Eric Dumazet --- include/linux/netdevice.h | 10 ++++++++++ include/uapi/linux/if_link.h | 1 + net/core/dev.c | 1 + net/core/gro.c | 20 ++++++++++++++++++-- net/core/rtnetlink.c | 15 +++++++++++++++ tools/include/uapi/linux/if_link.h | 1 + 6 files changed, 46 insertions(+), 2 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 9ed348d8b6f1195514c3b5f85fbe2c45b3fa997f..771440f6f8a8fa6cdadd398be8f2bacb4841138c 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1944,6 +1944,8 @@ enum netdev_ml_priv_type { * keep a list of interfaces to be deleted. * @gro_max_size: Maximum size of aggregated packet in generic * receive offload (GRO) + * @gro_ipv6_max_size: Maximum size of aggregated packet in generic + * receive offload (GRO), for IPv6 * * @dev_addr_shadow: Copy of @dev_addr to catch direct writes. * @linkwatch_dev_tracker: refcount tracker used by linkwatch. @@ -2140,6 +2142,7 @@ struct net_device { int napi_defer_hard_irqs; #define GRO_MAX_SIZE 65536 unsigned int gro_max_size; + unsigned int gro_ipv6_max_size; rx_handler_func_t __rcu *rx_handler; void __rcu *rx_handler_data; @@ -4910,6 +4913,13 @@ static inline void netif_set_gso_ipv6_max_size(struct net_device *dev, WRITE_ONCE(dev->gso_ipv6_max_size, size); } +static inline void netif_set_gro_ipv6_max_size(struct net_device *dev, + unsigned int size) +{ + /* This pairs with the READ_ONCE() in skb_gro_receive() */ + WRITE_ONCE(dev->gro_ipv6_max_size, size); +} + static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol, int pulled_hlen, u16 mac_offset, int mac_len) diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index 048a9c848a3a39596b6c3135553fdfb9a1fe37d2..9baa084fe2c6762b05029c4692cfd9c4646bb916 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -365,6 +365,7 @@ enum { IFLA_GRO_MAX_SIZE, IFLA_TSO_IPV6_MAX_SIZE, IFLA_GSO_IPV6_MAX_SIZE, + IFLA_GRO_IPV6_MAX_SIZE, __IFLA_MAX }; diff --git a/net/core/dev.c b/net/core/dev.c index 87f8b8cb39a61c8f5a444e3b341a97ba0a4c06d9..9921cee9c20d2bc396ef1f4d783ac01604b1e8be 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -10469,6 +10469,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, dev->gro_max_size = GRO_MAX_SIZE; dev->tso_ipv6_max_size = GSO_MAX_SIZE; dev->gso_ipv6_max_size = GSO_MAX_SIZE; + dev->gro_ipv6_max_size = GRO_MAX_SIZE; dev->upper_level = 1; dev->lower_level = 1; diff --git a/net/core/gro.c b/net/core/gro.c index ee5e7e889d8bdd8db18715afc7bb6c1c759c9c23..f795393a883b08d71bfcfbd2d897e1ddcddf6fce 100644 --- a/net/core/gro.c +++ b/net/core/gro.c @@ -136,11 +136,27 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb) unsigned int new_truesize; struct sk_buff *lp; + if (unlikely(NAPI_GRO_CB(skb)->flush)) + return -E2BIG; + /* pairs with WRITE_ONCE() in netif_set_gro_max_size() */ gro_max_size = READ_ONCE(p->dev->gro_max_size); - if (unlikely(p->len + len >= gro_max_size || NAPI_GRO_CB(skb)->flush)) - return -E2BIG; + if (unlikely(p->len + len >= gro_max_size)) { + /* pairs with WRITE_ONCE() in netif_set_gro_ipv6_max_size() */ + unsigned int gro6_max_size = READ_ONCE(p->dev->gro_ipv6_max_size); + + if (gro6_max_size > gro_max_size && + p->protocol == htons(ETH_P_IPV6) && + skb_headroom(p) >= sizeof(struct hop_jumbo_hdr) && + ipv6_hdr(p)->nexthdr == IPPROTO_TCP && + !p->encapsulation) + gro_max_size = gro6_max_size; + + if (p->len + len >= gro_max_size) + return -E2BIG; + } + lp = NAPI_GRO_CB(p)->last; pinfo = skb_shinfo(lp); diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 172de404c595c89e30651a091242a75be8f786b7..39c5a9fb792df3992b4e7177f4dfeba2553eaa08 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1029,6 +1029,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev, + nla_total_size(4) /* IFLA_GRO_MAX_SIZE */ + nla_total_size(4) /* IFLA_TSO_IPV6_MAX_SIZE */ + nla_total_size(4) /* IFLA_GSO_IPV6_MAX_SIZE */ + + nla_total_size(4) /* IFLA_GRO_IPV6_MAX_SIZE */ + nla_total_size(1) /* IFLA_OPERSTATE */ + nla_total_size(1) /* IFLA_LINKMODE */ + nla_total_size(4) /* IFLA_CARRIER_CHANGES */ @@ -1736,6 +1737,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, nla_put_u32(skb, IFLA_GRO_MAX_SIZE, dev->gro_max_size) || nla_put_u32(skb, IFLA_TSO_IPV6_MAX_SIZE, dev->tso_ipv6_max_size) || nla_put_u32(skb, IFLA_GSO_IPV6_MAX_SIZE, dev->gso_ipv6_max_size) || + nla_put_u32(skb, IFLA_GRO_IPV6_MAX_SIZE, dev->gro_ipv6_max_size) || #ifdef CONFIG_RPS nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || #endif @@ -1891,6 +1893,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = { [IFLA_GRO_MAX_SIZE] = { .type = NLA_U32 }, [IFLA_TSO_IPV6_MAX_SIZE] = { .type = NLA_U32 }, [IFLA_GSO_IPV6_MAX_SIZE] = { .type = NLA_U32 }, + [IFLA_GRO_IPV6_MAX_SIZE] = { .type = NLA_U32 }, }; static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { @@ -2786,6 +2789,15 @@ static int do_setlink(const struct sk_buff *skb, } } + if (tb[IFLA_GRO_IPV6_MAX_SIZE]) { + u32 max_size = nla_get_u32(tb[IFLA_GRO_IPV6_MAX_SIZE]); + + if (dev->gro_ipv6_max_size ^ max_size) { + netif_set_gro_ipv6_max_size(dev, max_size); + status |= DO_SETLINK_MODIFIED; + } + } + if (tb[IFLA_GSO_MAX_SEGS]) { u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]); @@ -3264,6 +3276,9 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname, if (tb[IFLA_GSO_IPV6_MAX_SIZE]) netif_set_gso_ipv6_max_size(dev, nla_get_u32(tb[IFLA_GSO_IPV6_MAX_SIZE])); + if (tb[IFLA_GRO_IPV6_MAX_SIZE]) + netif_set_gro_ipv6_max_size(dev, + nla_get_u32(tb[IFLA_GRO_IPV6_MAX_SIZE])); return dev; } diff --git a/tools/include/uapi/linux/if_link.h b/tools/include/uapi/linux/if_link.h index e40cd575607872d3bff3bc1971df8c6426290562..567008925a8be6900aa048c7ebb12684b2eebb4b 100644 --- a/tools/include/uapi/linux/if_link.h +++ b/tools/include/uapi/linux/if_link.h @@ -350,6 +350,7 @@ enum { IFLA_GRO_MAX_SIZE, IFLA_TSO_IPV6_MAX_SIZE, IFLA_GSO_IPV6_MAX_SIZE, + IFLA_GRO_IPV6_MAX_SIZE, __IFLA_MAX };