From patchwork Thu Oct 8 14:09:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jesper Dangaard Brouer X-Patchwork-Id: 269406 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=-9.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=unavailable 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 6C040C46466 for ; Thu, 8 Oct 2020 14:09:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30AB821927 for ; Thu, 8 Oct 2020 14:09:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="VMRJ8zTP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730526AbgJHOJp (ORCPT ); Thu, 8 Oct 2020 10:09:45 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:27918 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730476AbgJHOJj (ORCPT ); Thu, 8 Oct 2020 10:09:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602166177; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=32w48iMNGkmD+it7eg91axPb7iDFt5xqhVL3TNeV8g4=; b=VMRJ8zTPtzzzH12RTc67hGLxpA2Sb+5OUbLveOB0DIAEeoEsaXjh9Fs/nf7OtdnIJIsWWp 1R49ef8DlShjDzb4owKdCvpCfZrD87FE9r4LRq+UPe8RfzyAAv+B0RvjG0zgKGUJx/dR1Z 7rKvZ1u5jDDSonZ8t4C6Iq2cHS8ccDI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-414-zNhDG5Z2O_CA2BDK9_zNpA-1; Thu, 08 Oct 2020 10:09:33 -0400 X-MC-Unique: zNhDG5Z2O_CA2BDK9_zNpA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id CA0C4804018; Thu, 8 Oct 2020 14:09:31 +0000 (UTC) Received: from firesoul.localdomain (unknown [10.40.208.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id D42CD55768; Thu, 8 Oct 2020 14:09:28 +0000 (UTC) Received: from [192.168.42.3] (localhost [IPv6:::1]) by firesoul.localdomain (Postfix) with ESMTP id E58A730736C8B; Thu, 8 Oct 2020 16:09:27 +0200 (CEST) Subject: [PATCH bpf-next V3 6/6] net: inline and splitup is_skb_forwardable From: Jesper Dangaard Brouer To: bpf@vger.kernel.org Cc: Jesper Dangaard Brouer , netdev@vger.kernel.org, Daniel Borkmann , Alexei Starovoitov , maze@google.com, lmb@cloudflare.com, shaun@tigera.io, Lorenzo Bianconi , marek@cloudflare.com, John Fastabend , Jakub Kicinski , eyal.birger@gmail.com Date: Thu, 08 Oct 2020 16:09:27 +0200 Message-ID: <160216616785.882446.3058399056188507434.stgit@firesoul> In-Reply-To: <160216609656.882446.16642490462568561112.stgit@firesoul> References: <160216609656.882446.16642490462568561112.stgit@firesoul> User-Agent: StGit/0.19 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The BPF-helper bpf_skb_fib_lookup() use is_skb_forwardable() that also checks if net_device is "up", which is unnecessary for this helper. This patch splitup is_skb_forwardable() into is_skb_fwd_size_ok() such that the helper can use this instead. This change also cause is_skb_forwardable() to be inlined in the existing call sites. Most importantly in dev_forward_skb(). Signed-off-by: Jesper Dangaard Brouer --- include/linux/netdevice.h | 27 +++++++++++++++++++++++++-- net/core/dev.c | 21 --------------------- net/core/filter.c | 2 +- 3 files changed, 26 insertions(+), 24 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 58fb7b4869ba..4857c54590b5 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3862,8 +3862,31 @@ int xdp_umem_query(struct net_device *dev, u16 queue_id); int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb); int dev_forward_skb(struct net_device *dev, struct sk_buff *skb); -bool is_skb_forwardable(const struct net_device *dev, - const struct sk_buff *skb); + +static __always_inline bool is_skb_fwd_size_ok(const struct net_device *dev, + const struct sk_buff *skb) +{ + const u32 vlan_hdr_len = 4; /* VLAN_HLEN */ + unsigned int mtu = dev->mtu + dev->hard_header_len + vlan_hdr_len; + + /* Assumes SKB length at L2 */ + if (likely(skb->len <= mtu)) + return true; + + /* If TSO is enabled, we don't care about the length as the packet + * could be forwarded without being segmented before. + */ + return skb_is_gso(skb); +} + +static __always_inline bool is_skb_forwardable(const struct net_device *dev, + const struct sk_buff *skb) +{ + if (unlikely(!(dev->flags & IFF_UP))) + return false; + + return is_skb_fwd_size_ok(dev, skb); +} static __always_inline int ____dev_forward_skb(struct net_device *dev, struct sk_buff *skb, diff --git a/net/core/dev.c b/net/core/dev.c index 96b455f15872..21b62bda0ef9 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2186,27 +2186,6 @@ static inline void net_timestamp_set(struct sk_buff *skb) __net_timestamp(SKB); \ } \ -bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb) -{ - unsigned int len; - - if (!(dev->flags & IFF_UP)) - return false; - - len = dev->mtu + dev->hard_header_len + VLAN_HLEN; - if (skb->len <= len) - return true; - - /* if TSO is enabled, we don't care about the length as the packet - * could be forwarded without being segmented before - */ - if (skb_is_gso(skb)) - return true; - - return false; -} -EXPORT_SYMBOL_GPL(is_skb_forwardable); - int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) { int ret = ____dev_forward_skb(dev, skb, true); diff --git a/net/core/filter.c b/net/core/filter.c index a8e24092e4f5..14e6b93757d4 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5502,7 +5502,7 @@ BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, struct net_device *dev; dev = dev_get_by_index_rcu(net, params->ifindex); - if (!is_skb_forwardable(dev, skb)) + if (!is_skb_fwd_size_ok(dev, skb)) rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; params->mtu = dev->mtu; /* union with tot_len */