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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 1ADB7C4743C for ; Mon, 21 Jun 2021 18:03:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08BE261351 for ; Mon, 21 Jun 2021 18:03:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233727AbhFUSFt (ORCPT ); Mon, 21 Jun 2021 14:05:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:45498 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233232AbhFUSCS (ORCPT ); Mon, 21 Jun 2021 14:02:18 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C4E9C61402; Mon, 21 Jun 2021 17:55:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624298116; bh=Jqt3hR+Jp41pR6IvveiJL44RhOEw7yUt+5UF1OyRxm4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sqfG6S2qGGyzs+U68G2Eot3Nte7aUJFusLbT3afGElE6kCy8Nz2p9qEiV3SkKd6t2 FkqYvX6aD/6mkEQb+IZ+7/ffKjKfwIKvdPuTz0+qKtsFGMsEmHDFseHI0ZY+lcg+H8 BLQecbD/hslZsnqZm0V8sQLFNgt6RIG6kMip1S2XMi8FBoOAb3rSyy7mBGd4JU4Dns 0uFBCbe00D1ZUdqZw6ul/PgZw/xzOycjM0IA5mR9NJ1ixoH14a4qRYT2+6+xMtTltC o4PUpcDyepR72n/6axfWWLV0yCEPgRbbC3R7xbl+HSeT/mbcTOFSSagJD/1ylaRSF5 vXB6k4FE5Sz9Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Esben Haabendal , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 4.19 16/16] net: ll_temac: Avoid ndo_start_xmit returning NETDEV_TX_BUSY Date: Mon, 21 Jun 2021 13:54:50 -0400 Message-Id: <20210621175450.736067-16-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210621175450.736067-1-sashal@kernel.org> References: <20210621175450.736067-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Esben Haabendal [ Upstream commit f6396341194234e9b01cd7538bc2c6ac4501ab14 ] As documented in Documentation/networking/driver.rst, the ndo_start_xmit method must not return NETDEV_TX_BUSY under any normal circumstances, and as recommended, we simply stop the tx queue in advance, when there is a risk that the next xmit would cause a NETDEV_TX_BUSY return. Signed-off-by: Esben Haabendal Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/xilinx/ll_temac_main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c index 2241f9897092..939de185bc6b 100644 --- a/drivers/net/ethernet/xilinx/ll_temac_main.c +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c @@ -736,6 +736,11 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev) /* Kick off the transfer */ lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */ + if (temac_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1)) { + netdev_info(ndev, "%s -> netif_stop_queue\n", __func__); + netif_stop_queue(ndev); + } + return NETDEV_TX_OK; } -- 2.30.2