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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78580C43334 for ; Wed, 6 Jul 2022 20:25:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234214AbiGFUZs (ORCPT ); Wed, 6 Jul 2022 16:25:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234025AbiGFUZc (ORCPT ); Wed, 6 Jul 2022 16:25:32 -0400 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1471D2AE13 for ; Wed, 6 Jul 2022 13:25:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References: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-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=+52E+897hAC2yZGYmow7KzbKd9/5gHAo6CPMam//ys8=; b=q298a3vttxqTHLlptz8A64hgsG HNFlMBaLw35ZQPBB4mZrZMpEUkcn+HueFDAtHxUZuP+Db2omve3HUjGv336GMO+T6HazzNfgFe/pA yI4vwPYaASMFgVPJTUbKngcwCIojrc0n63/V+sjicJcBOC7tNG4diNphdlUgxwIVIf5Wiz3vNJNHT TSrTkOhVwcZgdae9GYhBqHelQm3LHKxJXSjMVvH/1m5Rko8vvwmgG3VB7oklgVPSHzh9xEpjoyyjw gTv4pt9KPTVCTxQ0aM+GoRbmnj4oyinvsTzPAQSNE/ukCz8f6Qyxq6tzLmLKlVJPI357PXXiFtloj w2L2Ec6g==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:33210) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1o9BZx-000387-FO; Wed, 06 Jul 2022 21:24:57 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1o9BZr-0004cc-Kg; Wed, 06 Jul 2022 21:24:51 +0100 Date: Wed, 6 Jul 2022 21:24:51 +0100 From: "Russell King (Oracle)" To: Hauke Mehrtens Cc: Florian Fainelli , Vladimir Oltean , Andrew Lunn , Heiner Kallweit , Alexandre Belloni , Alvin =?utf-8?Q?=C5=A0ipraga?= , Claudiu Manoil , "David S. Miller" , DENG Qingfang , Eric Dumazet , George McCollister , Jakub Kicinski , Kurt Kanzenbach , Landen Chao , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Matthias Brugger , netdev@vger.kernel.org, Paolo Abeni , Sean Wang , UNGLinuxDriver@microchip.com, Vivien Didelot , Woojung Huh Subject: Re: [PATCH RFC net-next v2 0/5] net: dsa: always use phylink Message-ID: References: <7fe6b661-06b9-96dd-e064-1db23a9eaae7@gmail.com> <20220706101459.tahby2xpm3e7okjz@skbuf> <4ec0461c-0000-ff8c-4368-5d68d70b894e@hauke-m.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4ec0461c-0000-ff8c-4368-5d68d70b894e@hauke-m.de> Sender: Russell King (Oracle) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Wed, Jul 06, 2022 at 09:05:22PM +0200, Hauke Mehrtens wrote: > On 7/6/22 18:27, Florian Fainelli wrote: > > On 7/6/22 03:14, Vladimir Oltean wrote: > > > Hi Florian, > > > > > > On Tue, Jul 05, 2022 at 09:42:33AM -0700, Florian Fainelli wrote: > > > > On 7/5/22 02:46, Russell King (Oracle) wrote: > > > > > A new revision of the series which incorporates changes that Marek > > > > > suggested. Specifically, the changes are: > > > > > > > > > > 1. Patch 2 - use the phylink_get_caps method in mv88e6xxx to get the > > > > >      default interface rather than re-using port_max_speed_mode() > > > > > > > > > > 2. Patch 4 - if no default interface is provided, use the supported > > > > >      interface mask to search for the first interface that gives the > > > > >      fastest speed. > > > > > > > > > > 3. Patch 5 - now also removes the port_max_speed_mode() method > > > > > > > > This was tested with bcm_sf2.c and b53_srab.b and did not cause > > > > regressions, > > > > however we do have a 'fixed-link' property for the CPU port > > > > (always have had > > > > one), so there was no regression expected. > > > > > > What about arch/arm/boot/dts/bcm47189-tenda-ac9.dts? > > > > You found one of the devices that I do not have access to and did not > > test, thanks. We do expect to run the port at 2GBits/sec on these > > devices however there is no "official" way to advertise that a port can > > run at 2Gbits/sec, as this is not even a "sanctioned" speed. I do have a > > similar device however, so let me run some more tests, we won't see a > > regression however since we do not use the NATP accelerator which would > > be the reason to run the port at 2Gbits/sec. > > I will try this change on some devices with the lantiq gswip driver at the > weekend. > > On the SoC supported by the lantiq gswip driver the switch is integrated in > the SoC and there is a internal link with more than 1GBit/s connecting the > switch to the rest of the system. I think it is also around 2GBit/s. We can > not configure the interface speed or many other interface settings for the > link between the switch and the CPU. How should the device tree ideally look > for this setup? I think this falls into Andrew's "don't specify anything" category, which means that we should default to the maximum speed for the port - which is in this case quite clearly fixed at whatever the internal link actually is. >From the get_caps() function, the fastest speed apparently supported is 1Gbps. I'm guessing the CPU port is one of ports 2..5 on xrx200 and 1..5 on xrx300 - in which case, PHY_INTERFACE_MODE_INTERNAL is likely to be selected, which seems appropriate given what you've said above. (PHY_INTERFACE_MODE_INTERNAL will be the first interface type found that will give the highest speed as it permits any speed given in the mac_capabilities.) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!