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Miller" , Maxime Coquelin , Giuseppe Cavallaro , Alexandre Torgue , Jose Abreu , netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, pei.lee.ling@intel.com Subject: Re: [PATCH net 1/1] net: stmmac: Resolve poor line rate after switching from TSO off to TSO on Message-ID: <20220715125148.GA21603@linux.intel.com> References: <20220228111558.3825974-1-vee.khee.wong@linux.intel.com> <20220302223248.2492658e@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220302223248.2492658e@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220715_055156_747650_1CF479B0 X-CRM114-Status: GOOD ( 20.61 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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X-IronPort-AV: E=McAfee;i="6400,9594,10408"; a="266199925" X-IronPort-AV: E=Sophos;i="5.92,273,1650956400"; d="scan'208";a="266199925" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jul 2022 05:51:53 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.92,273,1650956400"; d="scan'208";a="596459264" Received: from linux.intel.com ([10.54.29.200]) by orsmga002.jf.intel.com with ESMTP; 15 Jul 2022 05:51:53 -0700 Received: from linux.intel.com (vwong3-iLBPG3.png.intel.com [10.88.229.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by linux.intel.com (Postfix) with ESMTPS id 11086580970; Fri, 15 Jul 2022 05:51:50 -0700 (PDT) Date: Fri, 15 Jul 2022 20:51:48 +0800 From: Wong Vee Khee To: Jakub Kicinski Cc: "David S . Miller" , Maxime Coquelin , Giuseppe Cavallaro , Alexandre Torgue , Jose Abreu , netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, pei.lee.ling@intel.com Subject: Re: [PATCH net 1/1] net: stmmac: Resolve poor line rate after switching from TSO off to TSO on Message-ID: <20220715125148.GA21603@linux.intel.com> References: <20220228111558.3825974-1-vee.khee.wong@linux.intel.com> <20220302223248.2492658e@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20220302223248.2492658e@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 02, 2022 at 10:32:48PM -0800, Jakub Kicinski wrote: > On Mon, 28 Feb 2022 19:15:58 +0800 Wong Vee Khee wrote: > > From: Ling Pei Lee > > > > Sequential execution of these steps: > > i) TSO ON – iperf3 execution, > > ii) TSO OFF – iperf3 execution, > > iii) TSO ON – iperf3 execution, it leads to iperf3 0 bytes transfer. > > IMHO the iperf output can be dropped from the commit message, > it doesn't add much beyond this description. > Noted. Will drop those on next revision of pull request. > > Clear mss in TDES and call stmmac_enable_tso() to indicate > > a new TSO transmission when it is enabled from TSO off using > > ethtool command > > How does the TSO get disabled I don't see any ...enable_tso(, 0, ) > calls in the driver? And why call enable in fix_features rather > than set_features? It is disable when 'priv->tso = 0' in this same function. The reason I put this in fix_features rather than set_features is because the commit f748be531d70("stmmac: support new GMAC4") has already introduced the following codes in fix_features:- + /* Disable tso if asked by ethtool */ + if ((priv->plat->tso_en) && (priv->dma_cap.tsoen)) { + if (features & NETIF_F_TSO) + priv->tso = true; + else + priv->tso = false; + } BR, Vee Khee