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 F0590C3ABC9 for ; Fri, 16 May 2025 01:11:24 +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=9EedyhxrBbwBUSKEVvqPNTbJY5m3bFtYRpv0O+uq3Oo=; b=4SPol+OHeg2dF4NeqBwR8FrDtb LeeUTWGKNlk7Pa+amY6jbOViDPY/ViKx+ad/riVO1+JUHKOYvM3DQDa1bg9Dn1Ke6tuHawTECy6VT zzhlgD3L1fyy2kQFohZUqQshVVhbUZkcnXWVMa7bvrkJRaex46T3eaXi9KtWoADmQQPvTqV3onY8h JNQ6OB4uqcaep0z47lwpNHfTvhO8VZiXMJHYp0obbM9gyLPpuOnp3rCfWx6LmDaBQLkxixUCNhU+b xpe9TndnPwfmiMjWwIx5Dk9Eck21V9tzMqypjltxpYo8yHMa8BFJSLQH6Ih458SJIl52P/j/w/c5c YZJ8zkLg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uFjbY-00000002BO7-2MLX; Fri, 16 May 2025 01:11:16 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uFjZO-00000002B8m-1FEZ; Fri, 16 May 2025 01:09:03 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 3537C5C067A; Fri, 16 May 2025 01:06:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD1F0C4CEE7; Fri, 16 May 2025 01:08:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747357740; bh=LlunDUDR2TDmEZ4XUi/62Fa3/lxpELn/iGKcFemx0pY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=RGbgPKQxwqSNa6sH9Id4EeYCV2OlsMGF0tPsQ2HerBXkMsznD/z1C1dV7O90isz/5 PvGQjMzjA7R0CEJl7QIWw6BW9uQTvj6EYlwj8YUeyEvzablmHzdgLEsLbBVjNBhCUk HnbbR1dPatfKYT9qMd9bPlH50j8zjn8hnWKtt4jZj/XkJxAPi+AT/oWgrTwivLKlD6 cCzJmLUVLB5/3qqoiMZkD25VaGRxzw3iBAmJ64j8yLD9pIrJe49KhLUBaYdZluIFEO 8sBH69+tOVkmjgtGEGnxxwtTlqwra9xHqA27Y639nB4an2gwDDGKM3ufJ+jxUOPofZ 4inbHkljJci3g== Date: Thu, 15 May 2025 18:08:58 -0700 From: Jakub Kicinski To: Jinjian Song Cc: chandrashekar.devegowda@intel.com, chiranjeevi.rapolu@linux.intel.com, haijun.liu@mediatek.com, m.chetan.kumar@linux.intel.com, ricardo.martinez@linux.intel.com, loic.poulain@linaro.org, ryazanov.s.a@gmail.com, johannes@sipsolutions.net, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, angelogioacchino.delregno@collabora.com, linux-arm-kernel@lists.infradead.org, matthias.bgg@gmail.com, corbet@lwn.net, linux-mediatek@lists.infradead.org, helgaas@kernel.org, danielwinkler@google.com, korneld@google.com, andrew+netdev@lunn.ch, horms@kernel.org, rafael.wang@fibocom.com Subject: Re: [net-next v1] net: wwan: t7xx: Parameterize data plane RX BAT and FAG count Message-ID: <20250515180858.2568d930@kernel.org> In-Reply-To: <20250514104728.10869-1-jinjian.song@fibocom.com> References: <20250514104728.10869-1-jinjian.song@fibocom.com> 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-20250515_180902_388045_9EDBAEDB X-CRM114-Status: UNSURE ( 6.76 ) X-CRM114-Notice: Please train this message. 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 14 May 2025 18:47:28 +0800 Jinjian Song wrote: > The DMA buffer for data plane RX is currently fixed, being parameterized > to allow configuration. 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)? -- pw-bot: cr 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 C6DA1C3DA4A for ; Fri, 16 May 2025 03:50:00 +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:MIME-Version: Content-Transfer-Encoding:Content-Type:References:In-Reply-To:Message-Id:Date :Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=xPLW2rCkMv+4Czj7vrAp4oQPC0FEEUM1fN39vPF0NQg=; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Message-ID: <20250516034657.gk2Iw_wLxPP9JYDvOm0TTGGLHd0TMgC4pn_2CkG1t_g@z> >On Wed, 14 May 2025 18:47:28 +0800 Jinjian Song wrote: >> The DMA buffer for data plane RX is currently fixed, being parameterized >> to allow configuration. > >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. These prameters are only used for MTK t7xx driver. Jinjian, Best Regards.