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 EA942C282D2 for ; Tue, 4 Mar 2025 17:50:24 +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=CqAT5+Gi1O68uLcYreVHzC9MDAGC4lcpXT9gC3flVdI=; b=45EJkxEHpJy3sQOLn75vSrC4p9 lPffOPjwdi+zJwm/Sdmayh47qKGo9rMmkydn34xAcU///l63su/epNZlPHGFv7P64g12fB3d7/H2T xjRWcKIPglJ7/M5tGtr/tD6pCkqnfmFgg5k4My5AfNPUMgMUQqgDodRI/jkyA1C2agut59w04Hpc5 SOHFcREdE8SMRb187U2rqYIrup/tKAIEcEReUPM6P4JXMWx41Zf0IffSN3QcrXtsRjAOScTip7taF +oWeD9WTSYs+3ELPmA+2Sf+lm/e7cPcfde3hwq5PpgfTMXIZBv3aJdXzheUkqicWx+8lpEKhG5zk+ dYkRP6iQ==; 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x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddutddvhedtucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpeffhffvvefukfgjfhhoofggtgfgsehtqhertdertdejnecuhfhrohhmpeforgigihhmvgcuvehhvghvrghllhhivghruceomhgrgihimhgvrdgthhgvvhgrlhhlihgvrhessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepuefhfefggfdthffghfdvhffhhfetuedtkeetgffhteevheehjeejgfduieduhedunecukfhppeeltddrkeelrdduieefrdduvdejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepledtrdekledrudeifedruddvjedphhgvlhhopehfvgguohhrrgdrhhhomhgvpdhmrghilhhfrhhomhepmhgrgihimhgvrdgthhgvvhgrlhhlihgvrhessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepvddtpdhrtghpthhtohepkhhorhihrdhmrghinhgtvghnthessghoohhtlhhinhdrtghomhdprhgtphhtthhopegurghvvghmsegurghvvghmlhhofhhtrdhnvghtpdhrtghpthhtoheprghnughrvgifsehluhhnnhdrtghhpdhrtghpthhtohepkhhusggrsehkvghrnhgvlhdrohhrghdprhgtphhtthhopegvughumhgriigvthesghhoohhglhgvrdgtohhmpdhrt ghpthhtohepphgrsggvnhhisehrvgguhhgrthdrtghomhdprhgtphhtthhopehhkhgrlhhlfigvihhtudesghhmrghilhdrtghomhdprhgtphhtthhopehnvghtuggvvhesvhhgvghrrdhkvghrnhgvlhdrohhrgh X-GND-Sasl: maxime.chevallier@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250304_081525_641098_32B41511 X-CRM114-Status: GOOD ( 30.14 ) 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 Hi K=C3=B6ry, On Tue, 4 Mar 2025 17:00:51 +0100 Kory Maincent wrote: > On Sun, 2 Mar 2025 17:21:36 +0100 > Maxime Chevallier wrote: >=20 > > There are a few netlink commands that rely on the req_info->dev field > > being populated by ethnl in their ->prepare_data() and ->fill_reply(). > >=20 > > For a regular GET request, this will be set by ethnl_default_parse(), > > which calls ethnl_parse_header_dev_get(). > >=20 > > In the case of a DUMP request, the ->prepare_data() and ->fill_reply() > > callbacks will be called with the req_info->dev being NULL, which can > > cause discrepancies in the behaviour between GET and DUMP results. > >=20 > > The main impact is that ethnl_req_get_phydev() will not find any > > phy_device, impacting : > > - plca > > - pse-pd > > - stats > >=20 > > Some other commands rely on req_info->dev, namely : > > - coalesce in ->fill_reply to look for an irq_moder > >=20 > > Although cable_test and tunnels also rely on req_info->dev being set, > > that's not a problem for these commands as : > > - cable_test doesn't support DUMP > > - tunnels rolls its own ->dumpit (and sets dev in the req_info). > > - phy also has its own ->dumpit > >=20 > > All other commands use reply_data->dev (probably the correct way of > > doing things) and aren't facing this issue. > >=20 > > Simply set the dev in the req_info context when iterating to dump each > > dev. > >=20 > > Fixes: c15e065b46dc ("net: ethtool: Allow passing a phy index for some > > commands") Signed-off-by: Maxime Chevallier > > --- > >=20 > > Fixes tag targets the phy-index commit, as it introduced a change in > > behaviour for PLCA. From what I can tell, coalesce never correctly > > detected irq_moder in DUMP requests. > >=20 > > We could also consider fixing all individual commands that use > > req_info->dev, however I'm not actually sure it's incorrect to do so, > > feel free to correct me though. > >=20 > > Maxime > >=20 > > net/ethtool/netlink.c | 1 + > > 1 file changed, 1 insertion(+) > >=20 > > diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c > > index b4c45207fa32..de967961d8fe 100644 > > --- a/net/ethtool/netlink.c > > +++ b/net/ethtool/netlink.c > > @@ -582,6 +582,7 @@ static int ethnl_default_dumpit(struct sk_buff *skb, > > dev_hold(dev); > > rcu_read_unlock(); > > =20 > > + ctx->req_info->dev =3D dev; =20 >=20 > I would rather put it in ethnl_default_dump_one() before > ethnl_init_reply_data() call. Ah yes true, that'll be more consistent with the other callpaths. > With this change: > Reviewed-by: Kory Maincent > Tested-by: Kory Maincent Thank you for testing, I'll respin. Maxime >=20