From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 9A6831A08AF; Fri, 25 Apr 2025 12:40:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745584812; cv=none; b=Lp99Fr6N58qtykFSqTriaGzgrKUzyBqV56V3PUa+UpqI079hdUb16VX2KFnKMbsFUiaA+/9aG+qtAUVKHWAnCSpByzbT9g6ru2jfxkDjzv08IZk5QEmmjl8fsobHQiyoZ6p7fgLZVivyjUQC7arIvQf5KWUtcolXR3oB4jdeb9c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745584812; c=relaxed/simple; bh=l84s3l24uJI5BzEC5TFI3p7j+TPKs82FoLLx2xJ4JbU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=EVWEn6Q4KvdyqYS04x5OBpayRLTPszUaJDjV/Dk2hBIL3v14hdfg5zbZvVkiL/9CalVxy5rNnZdeUltiIowRCU+NDqNs1XSDl8rtpqjIX2izOCoY/zeUeVfAjy94ILbEYTUqlF8p/8c/j8qr/+xgz76h+yshC0McFD15fpQRCkk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JyL5agEl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JyL5agEl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C8D6C4CEE4; Fri, 25 Apr 2025 12:40:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745584812; bh=l84s3l24uJI5BzEC5TFI3p7j+TPKs82FoLLx2xJ4JbU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=JyL5agElbeBnCcwz6w8h2KndS1ujz8iKQH4r5yLeyerwV06Almzrm9danbCc84rMQ K6GrHnXjPAQLbHrjFD/SE2ezKhxcpcihsKo0WlyKf02s71d6xKVBZ04eztuTAdSnhO aDpFRhkgdalnXKXR7H9HXRq2Tvm9yLFei84mHlXAGFAHAdE0w5E9/+rwdmn4VADIK5 b6bcv2YRiwSma8xkXbsRTLP5RiKI4TFyAF6o4KnXfPoSBHOQiYSBPT9mTpApStFOSE QIxtnLmTwSdpPus0cXxZttlZpU62uonju8wrAMk4gx9u54azfpawI76TRvChQYwlke /xYgt9fPJGgXw== Message-ID: <9580167080271af15ef6f1f9d9baa586539bc34e.camel@kernel.org> Subject: Re: [PATCH v4 7/7] net: register debugfs file for net_device refcnt tracker From: Jeff Layton To: Eric Dumazet , Jakub Kicinski Cc: Andrew Lunn , Andrew Morton , "David S. Miller" , Paolo Abeni , Simon Horman , Kuniyuki Iwashima , Qasim Ijaz , Nathan Chancellor , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Date: Fri, 25 Apr 2025 08:40:09 -0400 In-Reply-To: References: <20250418-reftrack-dbgfs-v4-0-5ca5c7899544@kernel.org> <20250418-reftrack-dbgfs-v4-7-5ca5c7899544@kernel.org> <20250423165323.270642e3@kernel.org> <20250423173231.5c61af5b@kernel.org> <4118dbd6-2b4b-42c3-9d1e-2b533fc92a66@lunn.ch> <20250424155238.7d0d2a29@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV 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uxp4CHBDVzAslUi2idy+xpsp47DWPxYFIRP3M8QG/aNW052LaPc0cedYxp8+9eiVUNpxF4SiU4i9J DfX/sn9XcfoVZIxMpCRE750zvJvcCUz9HojsrMQ1NFc7MFT1z3MOW2/RlzPcog7xvR5ENPH19ojRD CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-04-24 at 16:07 -0700, Eric Dumazet wrote: > On Thu, Apr 24, 2025 at 3:52=E2=80=AFPM Jakub Kicinski = wrote: >=20 > > But with all that said, I guess you still want the "meaningful" ID for > > the netns, and that one is in fact stable :S >=20 > We could add a stable id for net devices, and use it for this purpose >=20 > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h > index 0321fd952f70887735ac789d72f72948a3879832..339d09167eaf7f58fc877fa47= 0c94175237ce534 > 100644 > --- a/include/linux/netdevice.h > +++ b/include/linux/netdevice.h > @@ -2544,6 +2544,8 @@ struct net_device { >=20 > struct hwtstamp_provider __rcu *hwprov; >=20 > + u64 permanent_id; > + > u8 priv[] ____cacheline_aligned > __counted_by(priv_len); > } ____cacheline_aligned; > diff --git a/net/core/dev.c b/net/core/dev.c > index d1a8cad0c99c47996e8bda44bf220266a5e51102..9d2d45e0246fab99ad3e75238= 85224bd114fa686 > 100644 > --- a/net/core/dev.c > +++ b/net/core/dev.c > @@ -10954,6 +10954,9 @@ int register_netdevice(struct net_device *dev) > { > int ret; > struct net *net =3D dev_net(dev); > + static atomic64_t permanent_id; > + > + dev->permanent_id =3D atomic64_inc_return(&permanent_id); >=20 > BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE < > NETDEV_FEATURE_COUNT); That would give us uniqueness, but the name doesn't mean anything and it wouldn't be trivial to track down which ref_tracker/netdev-* file refers to which device. If we're going to go that route, we're probably better off just embedding the address in the name using a "netdev@%px" format. --=20 Jeff Layton