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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 339B1C3ABD8 for ; Fri, 16 May 2025 16:12:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=uCC2wFvX+VRXPFM+UqJWuDREx7PiggiD0yB6yD7SpzU=; b=NXvFwhjeKL3sMm3rAgK0PFmovt hLM/SfOX6fLGBOi2I1npYA782BySPpuWlwgUfCnWFZyo7Lwbg9ijHb4A1TXLRJfTDnShaARcyJ/gH W8ygYBBuF/H5JcIshp7PgM2ADfkEPMfudIvzi1s7HOJ4CsQNM6U5c6esuGnUlCtE4A+H24ahdTU+U ZBchUeyWkna6GNSyzQlP3hovFemT+9bB730Yto8+MmWIKUbtKlzGo+c+ScNmN64KTKJ7W7Gclwyl/ QNRG850m1DkJh7Mu62LSe7q/1gCtGfrFYqrd6A55zFaGXtV+5r4wQAAAtEpKZUp/z6Ol/9L1FfE1n BRxq/S4w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uFxg7-00000003ynv-0PJL; Fri, 16 May 2025 16:12:55 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uFxDW-00000003tO3-3Bm0; Fri, 16 May 2025 15:43:24 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 5685743786; Fri, 16 May 2025 15:43:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79B69C4CEF0; Fri, 16 May 2025 15:43:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747410202; bh=JX6JzbUHGsSlhtbCchsrt85j6DDVCcgzO9j3GrNG8PM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=T42LItu/hK1i86e2aCIt+WEP4NJzf4EQ8lDPZyKYgO3dkrEMLM78MUkRcCoDKnnzC /9WjEBYk989deDxl0d8r877edJv0c3Mlkbxpjtte66iq6UIR67890PwDSSXIA5Pjau znqMjRHhNDgUHyu2cbOk0o7+9H2GIGfRa4+6aHt+OaCjN5eURvrkHxoaP1QYy/GvAk eCy0T4bLBfr2cnlrV+wKiqXJNc+xxwsXAapB0qtnmOgWkB9W/dqwYyj+UPNydatxXP sFz63Dg8wJ/9moBgA1cZdZVZZQms6APs9jDtbZubuCTKKT6tGWITa1WiV88T1+5FBY fx5M4fHy8MM8g== Date: Fri, 16 May 2025 08:43:20 -0700 From: Jakub Kicinski To: Jinjian Song Cc: andrew+netdev@lunn.ch, angelogioacchino.delregno@collabora.com, chandrashekar.devegowda@intel.com, chiranjeevi.rapolu@linux.intel.com, corbet@lwn.net, danielwinkler@google.com, davem@davemloft.net, edumazet@google.com, haijun.liu@mediatek.com, helgaas@kernel.org, horms@kernel.org, johannes@sipsolutions.net, korneld@google.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, loic.poulain@linaro.org, m.chetan.kumar@linux.intel.com, matthias.bgg@gmail.com, netdev@vger.kernel.org, pabeni@redhat.com, rafael.wang@fibocom.com, ricardo.martinez@linux.intel.com, ryazanov.s.a@gmail.com Subject: Re: [net-next v1] net: wwan: t7xx: Parameterize data plane RX BAT and FAG count Message-ID: <20250516084320.66998caf@kernel.org> In-Reply-To: <20250515180858.2568d930@kernel.org> References: <20250514104728.10869-1-jinjian.song@fibocom.com> <20250515180858.2568d930@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250516_084322_822208_A31D85E5 X-CRM114-Status: GOOD ( 12.09 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Fri, 16 May 2025 11:46:57 +0800 Jinjian Song wrote: > >Module parameters are discouraged, they are pretty poor as an API since > >they apply to all devices in the system. Can you describe what "frg" > >and "bat" are ? One of the existing APIs likely covers them. > >Please also describe the scope (are they per netdev or some sort of > >device level params)? > > MTK t7xx data plane hardware use BAT (Buffer Address Table) and FRG (Fragment) BAT > to describle and manager RX buffer, these buffers will apply for a fixed size after > the driver probe, and accompany the life cycle of the driver. > > On some platforms, especially those that use swiotlb to manager buffers, without > changing the buffer pool provided by swiotlb, it's needed to adjust the buffers > used by the driver to meet the requirements. > So parameterize these buffers applicable to the MTK t7xx driver to facilitate > different platforms to work with different configurations. Have you looked at https://docs.kernel.org/networking/ethtool-netlink.html#rings-set ? 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Received: from TY0PR02MB5766.apcprd02.prod.outlook.com (2603:1096:400:1b5::6) by SEZPR02MB6410.apcprd02.prod.outlook.com (2603:1096:101:12a::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8746.30; Tue, 20 May 2025 02:59:47 +0000 Received: from TY0PR02MB5766.apcprd02.prod.outlook.com ([fe80::f53d:47b:3b04:9a8b]) by TY0PR02MB5766.apcprd02.prod.outlook.com ([fe80::f53d:47b:3b04:9a8b%5]) with mapi id 15.20.8746.030; Tue, 20 May 2025 02:59:47 +0000 From: Jinjian Song To: kuba@kernel.org Cc: andrew+netdev@lunn.ch, angelogioacchino.delregno@collabora.com, chandrashekar.devegowda@intel.com, chiranjeevi.rapolu@linux.intel.com, corbet@lwn.net, danielwinkler@google.com, davem@davemloft.net, edumazet@google.com, haijun.liu@mediatek.com, helgaas@kernel.org, horms@kernel.org, jinjian.song@fibocom.com, johannes@sipsolutions.net, korneld@google.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, loic.poulain@linaro.org, m.chetan.kumar@linux.intel.com, matthias.bgg@gmail.com, netdev@vger.kernel.org, pabeni@redhat.com, rafael.wang@fibocom.com, ricardo.martinez@linux.intel.com, ryazanov.s.a@gmail.com Subject: Re: [net-next v1] net: wwan: t7xx: Parameterize data plane RX BAT and FAG count Date: Tue, 20 May 2025 10:59:34 +0800 Message-ID: <20250516084320.66998caf@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250516084320.66998caf@kernel.org> References: <20250514104728.10869-1-jinjian.song@fibocom.com> <20250515180858.2568d930@kernel.org> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org Content-Type: text/plain; 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Can you describe what "frg" >> >and "bat" are ? One of the existing APIs likely covers them. >> >Please also describe the scope (are they per netdev or some sort of >> >device level params)? >> >> MTK t7xx data plane hardware use BAT (Buffer Address Table) and FRG (Fragment) BAT >> to describle and manager RX buffer, these buffers will apply for a fixed size after >> the driver probe, and accompany the life cycle of the driver. >> >> On some platforms, especially those that use swiotlb to manager buffers, without >> changing the buffer pool provided by swiotlb, it's needed to adjust the buffers >> used by the driver to meet the requirements. >> So parameterize these buffers applicable to the MTK t7xx driver to facilitate >> different platforms to work with different configurations. > >Have you looked at >https://docs.kernel.org/networking/ethtool-netlink.html#rings-set >? > Hi Jakub, Thanks, I've just learned this content. I think ETHTOOL_STRINGPARAM is a good summary of the ring parameters and can be referred to and applied to WWAN. However, it seemes that this can't be configured when the driver is loaded and requires an application through ioctrl. In addition, directly using this parameter can't well correspond to the multiple buffer representing BAT in the t7xx driver. If it's not feasible to directly add parameters for configuring this RX buffer(BAT/FAG) to the mtk_t7xx driver, would it be allowed to add aparameter for a default configuration ratio (1/2, 1/4)? Or is it not recommended to use driver parameters for mtk_t7xx driver. Thanks, Best Regards.