From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 705F614A0BD; Tue, 25 Jun 2024 11:59:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.193 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719316771; cv=none; b=oOv6sT3zUajGsTCZl465lgl/BZzxNNs/7or/ua/69z4ppFBPYsvffKrUC/lLd2/ijgKD5kCLlZiW1hIzbP9ilazkbf7rRAOk/F5IMP4QmQeX6lmfwdBgDMu/BRV4Hf7jVblrqYpaaAohF9NgFtp6O+k+eDCqchpu5gdaU7YJ4NU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719316771; c=relaxed/simple; bh=QahEkLu9TC7Ijt9CJgc7loymkbNQEbP54b1wEkKu14k=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IHwvmCTMIKiB2MY3V/Ovli2eEgK7C7+jSyQnSh9r9p5jL0YODU0FhyZ0ZpmbTMSpAX/yox4bh80+TaZLdO5AklOEoCrAkYmgxcqonff6PW1M2DIHMeQ6lhg1xOhW1wUYC6k2/nOcusc/ywbv9rKJBSAPJCct9UH7ZVC69Axewkc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=VR7qrcUR; arc=none smtp.client-ip=217.70.183.193 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="VR7qrcUR" Received: by mail.gandi.net (Postfix) with ESMTPSA id E78CF240008; Tue, 25 Jun 2024 11:59:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1719316760; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bymOF6q/GmNuK/4tr2qlAhNMY7OYSXYN+52K4/jUKz4=; b=VR7qrcUREdOYnveWozg5HRW4txUj8aV6OxBVLDVv5zFe34TYSp7r91HfgwVWFAQoWjHctd ybQ31jFGiro1WO3mNfSDxUscZ6IDXJGElPOSkeSMJgn/phaZsuEc2alKGgER5b6XtZQXZA wCrcAx5KVzYTujOxFY4y8el4n5OswhpNiTG8/jgJWe3GiEVuOVLqJch/NOFTzYcfzpzpWQ DMU4T+hMxyS6U36FbtzZ+VIBhIrbKXcSWlYqyGAbUzUyM5lzk6B5hAFwEMYZ2B8niQLk75 czn68yC2CgoPRNn+SPL1lboPIsod8ZdEDFBYTBypQ5hIor5fbgwLRHdKk34EbQ== Date: Tue, 25 Jun 2024 13:59:18 +0200 From: Kory Maincent To: Oleksij Rempel Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , Thomas Petazzoni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Dent Project , kernel@pengutronix.de, UNGLinuxDriver@microchip.com Subject: Re: [PATCH net-next v3 1/7] net: ethtool: pse-pd: Expand C33 PSE status with class, power and extended state Message-ID: <20240625135918.65f71c1e@kmaincent-XPS-13-7390> In-Reply-To: References: <20240614-feature_poe_power_cap-v3-0-a26784e78311@bootlin.com> <20240614-feature_poe_power_cap-v3-1-a26784e78311@bootlin.com> <20240617154712.76fa490a@kmaincent-XPS-13-7390> <20240625111835.5ed3dff2@kmaincent-XPS-13-7390> Organization: bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-GND-Sasl: kory.maincent@bootlin.com On Tue, 25 Jun 2024 12:33:50 +0200 Oleksij Rempel wrote: > Hi K=C3=B6ry, >=20 > On Tue, Jun 25, 2024 at 11:18:35AM +0200, Kory Maincent wrote: > [...] =20 > [...] =20 > [...] =20 > [...] =20 > [...] =20 > >=20 > > In fact I can't test it, I have a splitter and an adjustable load, not a > > splitter that can adjust it's own load. So I can't decrease the load of= the > > splitter itself and reach this error condition. =20 >=20 > Hm.. how about this setup: > ------>>-----x--------->>---- =20 > PSE |-load splitter > ------>>-----x--------->>---- =20 >=20 > Attach the load directly to the ethernet line after PSE did > classification with splitter. Then remove splitter. As long as load is > high enough, PSE will not turn the port off. Then reduce load until it dr= ops > below the threshold. That was a good idea but I can't managed do test it. This is what I try:=20 /---ethernet cable---PD PSE=3D=3D=3Dpassive splitter=3D+ \---barrel cable---load The active PD is well powered with PoE negotiation but there is no voltage = at the barrel cable of the passive splitter so the load is useless. :/ Maybe passive splitter works only with passive injector. Regards, --=20 K=C3=B6ry Maincent, Bootlin Embedded Linux and kernel engineering https://bootlin.com