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 84721405C5C;
	Mon, 18 May 2026 23:18:29 +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=1779146309; cv=none; b=U2lzZUsqfpJl/nhuMe5h0oAxIV2Ear22hnj8rk9VKJTmZrxaKhvYBT7BrEVstXn/Gw/6a5TWVYq/beOprnBttqHpHKgp4gg49HOvcpl5uiQOK1cOitSONPrmXBccPNPnyJ2pZlS4Vf0Z9KKRUeaEmu8xGWo8IgC43zNPwmkOZAw=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1779146309; c=relaxed/simple;
	bh=hSrUietGsWm4nbIdz8mtePDymIlbVtfyxxCKrDmNEik=;
	h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References:
	 MIME-Version:Content-Type; b=PHEssEzPsy+4lRt3cY4tuPXl+/g8GKXvKmWHxg5vfE/jyI3gmrl3ev+NxIL+K4odHtNhJajUMU8Es/H7cQd1Ul6nuTQxhgI4jQIC7g4CgGD3vaJzoHlGe7R8Fpd56E6TpQ9XatjduzH9gi33g5mbim7WWhwRJCZDGb18HU0tX1s=
ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KpRw/8Nt; 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="KpRw/8Nt"
Received: by smtp.kernel.org (Postfix) with ESMTPSA id A7A00C2BCB7;
	Mon, 18 May 2026 23:18:28 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;
	s=k20201202; t=1779146309;
	bh=hSrUietGsWm4nbIdz8mtePDymIlbVtfyxxCKrDmNEik=;
	h=Date:From:To:Cc:Subject:In-Reply-To:References:From;
	b=KpRw/8Nt6yO+BBPAie79YSEvMfXtWiReT8HGBfDWNZZnaOPKUNFBwED9UB0v8G/88
	 lHkaWHon75Pr+Qj+2IR+Rs+CXxyyzjt6mqbx/UZ5muUuXVMszlKv6EUE5L/ocPWXqi
	 8f8gXpOChRXW24oWtBs+ePGo8wCi2HzvYUpXX2pmZsC/EUHN9qpUCLT7iXkU19OcwY
	 jqh5FSzaE0Vw5fJ6vcKnXAXOHC1G0HsG9KtNPejHpEzCAG9WHWN6FRhDBaIb1d0Yv5
	 nkaDMpUFyNrPCgA6v5Ndzokzq9uZfiXDS2ifJnCgLESEjizzS2W6sUbhuSq1LDJGag
	 0dC/SDmhRVSBw==
Date: Mon, 18 May 2026 16:18:27 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Jakub Sitnicki <jakub@cloudflare.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>, "David S. Miller"
 <davem@davemloft.net>, David Ahern <dsahern@kernel.org>, Eric Dumazet
 <edumazet@google.com>, Paolo Abeni <pabeni@redhat.com>, Simon Horman
 <horms@kernel.org>, Martin KaFai Lau <martin.lau@kernel.org>,
 netdev@vger.kernel.org, bpf@vger.kernel.org, kernel-team@cloudflare.com
Subject: Re: [PATCH net v2] net: Clear skb metadata in LWT BPF xmit
Message-ID: <20260518161827.2ac4766f@kernel.org>
In-Reply-To: <20260514-bpf-lwt-drop-skb-metadata-v2-1-458664edc2b5@cloudflare.com>
References: <20260514-bpf-lwt-drop-skb-metadata-v2-1-458664edc2b5@cloudflare.com>
Precedence: bulk
X-Mailing-List: netdev@vger.kernel.org
List-Id: <netdev.vger.kernel.org>
List-Subscribe: <mailto:netdev+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:netdev+unsubscribe@vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

On Thu, 14 May 2026 12:47:09 +0200 Jakub Sitnicki wrote:
> +		/* LWT BPF programs cannot access skb metadata but can corrupt
> +		 * it with helpers that operate on skb headroom. Drop it.
> +		 */
> +		skb_metadata_clear(skb);

Sashiko has a point, right? Is there something in LWT which would
prevent us from working on clones?