From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 ABDFEC432C3 for ; Sat, 16 Nov 2019 15:57:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7748A2089D for ; Sat, 16 Nov 2019 15:57:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573919831; bh=faAfye4U9NiBAVX4GKVcclxbx9Ur0Cd7sQHtZGt+ov0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=O1nvIDS60OTS1GURyUszlsZqn2glTfQna9XzvSB4GPlovVCKTtbuqGUzy0kc2MXpO /1XO9lpX36st/n3RrHNqvgxPzn3mqBDoa9f8ssNA78RC6X2+kxRHbJOcwapc6yOxjD H0PaUH7SxP+2AoibT99o/7jx5H7EtCbtGtTJW0a4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731570AbfKPPzR (ORCPT ); Sat, 16 Nov 2019 10:55:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:37266 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731558AbfKPPzQ (ORCPT ); Sat, 16 Nov 2019 10:55:16 -0500 Received: from sasha-vm.mshome.net (unknown [50.234.116.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E6C62218BA; Sat, 16 Nov 2019 15:55:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573919715; bh=faAfye4U9NiBAVX4GKVcclxbx9Ur0Cd7sQHtZGt+ov0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2RjHV2kGM+rEwzIl72PLUuZEeOtAdvLlFTgYDJakdqyAC6phAmVf9wR+lB1JkLFOW ZaLBlFeIQ2L1k5EDuJtv43guX2kkKuHlgOyNIgttKVBThqThhLAWml0AWGANNxFswT J1Gub57ebuADy4WX6fkuZycwkSL3WetjtIVqqv+I= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Eric Dumazet , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 58/77] net: do not abort bulk send on BQL status Date: Sat, 16 Nov 2019 10:53:20 -0500 Message-Id: <20191116155339.11909-58-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191116155339.11909-1-sashal@kernel.org> References: <20191116155339.11909-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Eric Dumazet [ Upstream commit fe60faa5063822f2d555f4f326c7dd72a60929bf ] Before calling dev_hard_start_xmit(), upper layers tried to cook optimal skb list based on BQL budget. Problem is that GSO packets can end up comsuming more than the BQL budget. Breaking the loop is not useful, since requeued packets are ahead of any packets still in the qdisc. It is also more expensive, since next TX completion will push these packets later, while skbs are not in cpu caches. It is also a behavior difference with TSO packets, that can break the BQL limit by a large amount. Note that drivers should use __netdev_tx_sent_queue() in order to have optimal xmit_more support, and avoid useless atomic operations as shown in the following patch. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/dev.c b/net/core/dev.c index 18a5154e2f254..903c6242b4499 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2801,7 +2801,7 @@ struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *de } skb = next; - if (netif_xmit_stopped(txq) && skb) { + if (netif_tx_queue_stopped(txq) && skb) { rc = NETDEV_TX_BUSY; break; } -- 2.20.1