From patchwork Tue Jul 13 20:58:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vasily Averin X-Patchwork-Id: 477320 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=-17.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_SANE_1 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 D9C64C07E95 for ; Tue, 13 Jul 2021 20:58:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C405B60FED for ; Tue, 13 Jul 2021 20:58:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236085AbhGMVBW (ORCPT ); Tue, 13 Jul 2021 17:01:22 -0400 Received: from relay.sw.ru ([185.231.240.75]:56802 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234765AbhGMVBV (ORCPT ); Tue, 13 Jul 2021 17:01:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=Content-Type:MIME-Version:Date:Message-ID:Subject :From; bh=DjCOdgpkoI0at8tuKwNz31O7tJL6hWslJd/79i+mUfg=; b=i4kDdCI+EgLRON8xYQm YUW/6jSjegOdiUvRv+h1vIAWIJU7kngB8PWw4fYWphEcz2jgwMCTkhJQ6SVnpUO3k4v8TP9AQXKVu 0cZOnAN8i62A2BKxVh78s17sYc7LugabnsOtcbEiDCfeaFOI2dQmHEqZ4Yu7GbJjJ66+8skPRWk=; Received: from [10.93.0.56] by relay.sw.ru with esmtp (Exim 4.94.2) (envelope-from ) id 1m3PU5-003saG-Nn; Tue, 13 Jul 2021 23:58:29 +0300 From: Vasily Averin Subject: [PATCH NET v2 5/7] vrf: use skb_expand_head in vrf_finish_output To: "David S. Miller" , Hideaki YOSHIFUJI , David Ahern , Jakub Kicinski , Eric Dumazet Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <55c9e2ae-b060-baa2-460c-90eb3e9ded5c@virtuozzo.com> Message-ID: <85ba9cbe-2687-5af0-0b10-f06e35b44882@virtuozzo.com> Date: Tue, 13 Jul 2021 23:58:28 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Unlike skb_realloc_headroom, new helper skb_expand_head does not allocate a new skb if possible. Signed-off-by: Vasily Averin --- drivers/net/vrf.c | 21 +++++++-------------- 1 file changed, 7 insertions(+), 14 deletions(-) diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c index 28a6c4c..82e7696 100644 --- a/drivers/net/vrf.c +++ b/drivers/net/vrf.c @@ -857,30 +857,24 @@ static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *s unsigned int hh_len = LL_RESERVED_SPACE(dev); struct neighbour *neigh; bool is_v6gw = false; - int ret = -EINVAL; nf_reset_ct(skb); /* Be paranoid, rather than too clever. */ if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { - struct sk_buff *skb2; - - skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); - if (!skb2) { - ret = -ENOMEM; - goto err; + skb = skb_expand_head(skb, hh_len); + if (!skb) { + skb->dev->stats.tx_errors++; + return -ENOMEM; } - if (skb->sk) - skb_set_owner_w(skb2, skb->sk); - - consume_skb(skb); - skb = skb2; } rcu_read_lock_bh(); neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); if (!IS_ERR(neigh)) { + int ret; + sock_confirm_neigh(skb, neigh); /* if crossing protocols, can not use the cached header */ ret = neigh_output(neigh, skb, is_v6gw); @@ -889,9 +883,8 @@ static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *s } rcu_read_unlock_bh(); -err: vrf_tx_error(skb->dev, skb); - return ret; + return -EINVAL; } static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)