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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 AA1CFC43381 for ; Tue, 26 Feb 2019 19:08:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C64221852 for ; Tue, 26 Feb 2019 19:08:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728815AbfBZTIR (ORCPT ); Tue, 26 Feb 2019 14:08:17 -0500 Received: from esa4.microchip.iphmx.com ([68.232.154.123]:55719 "EHLO esa4.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727054AbfBZTIQ (ORCPT ); Tue, 26 Feb 2019 14:08:16 -0500 X-IronPort-AV: E=Sophos;i="5.58,416,1544511600"; d="scan'208";a="26922216" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa4.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 26 Feb 2019 12:08:15 -0700 Received: from BW-Ubuntu-tester.mchp-main.com (10.10.76.4) by chn-sv-exch06.mchp-main.com (10.10.76.107) with Microsoft SMTP Server id 14.3.352.0; Tue, 26 Feb 2019 12:08:15 -0700 From: Bryan Whitehead To: CC: , Subject: [PATCH v1 net] lan743x: Fix TX Stall Issue Date: Tue, 26 Feb 2019 14:06:26 -0500 Message-ID: <1551207986-7283-1-git-send-email-Bryan.Whitehead@microchip.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org It has been observed that tx queue stalls while downloading from certain web sites (example www.speedtest.net) The cause has been tracked down to a corner case where dma descriptors where not setup properly. And there for a tx completion interrupt was not signaled. This fix corrects the problem by properly marking the end of a multi descriptor transmission. fixes: 23f0703c125b ("lan743x: Add main source files for new lan743x driver") Signed-off-by: Bryan Whitehead --- drivers/net/ethernet/microchip/lan743x_main.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c index 310807e..4d1b4a2 100644 --- a/drivers/net/ethernet/microchip/lan743x_main.c +++ b/drivers/net/ethernet/microchip/lan743x_main.c @@ -1400,7 +1400,8 @@ static int lan743x_tx_frame_start(struct lan743x_tx *tx, } static void lan743x_tx_frame_add_lso(struct lan743x_tx *tx, - unsigned int frame_length) + unsigned int frame_length, + int nr_frags) { /* called only from within lan743x_tx_xmit_frame. * assuming tx->ring_lock has already been acquired. @@ -1410,6 +1411,10 @@ static void lan743x_tx_frame_add_lso(struct lan743x_tx *tx, /* wrap up previous descriptor */ tx->frame_data0 |= TX_DESC_DATA0_EXT_; + if (nr_frags <= 0) { + tx->frame_data0 |= TX_DESC_DATA0_LS_; + tx->frame_data0 |= TX_DESC_DATA0_IOC_; + } tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail]; tx_descriptor->data0 = tx->frame_data0; @@ -1514,8 +1519,11 @@ static void lan743x_tx_frame_end(struct lan743x_tx *tx, u32 tx_tail_flags = 0; /* wrap up previous descriptor */ - tx->frame_data0 |= TX_DESC_DATA0_LS_; - tx->frame_data0 |= TX_DESC_DATA0_IOC_; + if ((tx->frame_data0 & TX_DESC_DATA0_DTYPE_MASK_) == + TX_DESC_DATA0_DTYPE_DATA_) { + tx->frame_data0 |= TX_DESC_DATA0_LS_; + tx->frame_data0 |= TX_DESC_DATA0_IOC_; + } tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail]; buffer_info = &tx->buffer_info[tx->frame_tail]; @@ -1600,7 +1608,7 @@ static netdev_tx_t lan743x_tx_xmit_frame(struct lan743x_tx *tx, } if (gso) - lan743x_tx_frame_add_lso(tx, frame_length); + lan743x_tx_frame_add_lso(tx, frame_length, nr_frags); if (nr_frags <= 0) goto finish; -- 2.7.4