From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f53.google.com (mail-ot1-f53.google.com [209.85.210.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 60C28378813 for ; Wed, 29 Apr 2026 15:18:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777475916; cv=none; b=DETmDD1qBvAwzq4L36xBhfhFKvbxHLkGhOX7/46gt3q4l4ysdgLIEDZyfdcPvXfXq/Qmspxxwx5wvE885dtQscIYMEQZ23gzI3HUp6YKzpQtqZrAFv04UORb8lJg5kKF5TUgE4yJG6B1iUy2g79AtCVX5AOd7QYDxulo497zod0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777475916; c=relaxed/simple; bh=/BimwSCUsuashVXwD+dzxd+4t5G8fzzhA6oBT4Cnlr0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Fo5iaWcoTesBvzHuiMNDQjPCJd/qgw5YHjxHi9easbt9hkMSdCTLjHaLLnx/iLVydPcdqggO+zPCqAWzuBhKoQDR8dXJmp/ia+mI35FJt7c5n66uHk9dCTgQm+2YRZsPE1kvuecWlnK8Iv23XC/EqUNl+xeNjgha/rzOTsQKq0s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=b7iJCGba; arc=none smtp.client-ip=209.85.210.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="b7iJCGba" Received: by mail-ot1-f53.google.com with SMTP id 46e09a7af769-7dbd23bc684so7133168a34.2 for ; Wed, 29 Apr 2026 08:18:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1777475913; x=1778080713; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=7hCAZnYdZvdp+ak79vsUFUwhsK90OGnLnVC3WYq76N8=; b=b7iJCGbaNlXtp4X0g6/WayFeLAL1bJl7AXsejxs7Gg1yd3+tXxfLCqVRJ6zgl+87Ty AzkjBbmGxQXA5dPHLvzunpTs8WxAQ7r7BYtmSYzNn8xmKooUmrYgvDByEfrGR9oMNHST 6CYlQCxvgSVqcxF4KUQH1q7M9m7OjIWYp2+HxRh/LoRPURMvrEgXRK9WNLNlB7BsykRX Pmu2UsOH9F8ek8o5h+A7RETSgO/zEg5diwBo2XSltxub7IYnetVfLLiar8QOKiuubRSR mVR2pcvukrXZxLDMZLKOgq8uo+utneT0SkFkFgAMAA8W5wNs+4wTTLLdIaYkjcrXUpMc ExWA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777475913; x=1778080713; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=7hCAZnYdZvdp+ak79vsUFUwhsK90OGnLnVC3WYq76N8=; b=dyIUoE8gjdaMLV79iO3u7Ssz70FkVsnOIBicDjTMlrU6mwZZTGXVpmAfcysGtkoRr9 vaAgXU7ZaVXs6FlrUHXvJZEIsYS/I9j1YroDM99OSVZjUin/YoIObEuDLVcBqSbUwxyb CGCLWhg3WSIASlrs86f/GNBrZ2QHTA7wnDiyiO4GzyevgFM/qjw2JOKFQj0BMvYhAxmP iPkre5wAor5tJfP/9VniCEAKgXASnRQDDOKGKtOvF2t3EHjhANP+QrJFd3zq41B+IB/4 u0/JObbY8aruuj7bTdTnaQ7LqbzV7TsWngGonIlMfNeVqKVY7TAR4+Ob0BtOakhy4p3j WR1Q== X-Forwarded-Encrypted: i=1; AFNElJ8gxbtuFFJj41I1yJp6Zt24cvJ/NA5lV9BE00xkGxRWV4mT2AuO4LPylSwPjAkIXAgs9n1RL0c=@vger.kernel.org X-Gm-Message-State: AOJu0YwfLSmxzQbuvNCvvdwAK3wexB2+yBKkWCAw/6/P62A0UVdU8hue Va7K29d069XaNO5r1VHtM9LPHk6yXcG1dJfiZWWPgsc2Bw1+5dvY9nxq X-Gm-Gg: AeBDieuoIiLL1ACYzjaXNO4I63YXD9yOVky3rhAEJOD6zBS5gpaOb4tIfwaAo2krbUV Hl/zPVgJtj1y6gbz2nKe8A2eEl1odCq9wFEgDujL91oMlhGESUio+pQDpuo1gvhH2pTusQi7TFn Pt32i8dIUoprE4zzZcOiDTeFybMUCQybFhupW+RbziD++lFzhESvWCREvi2sgvy0qrrDHzDUBnb ZS6rnlSbNm4kM+99TojbK1gjnCT9SLPGZZM+vIeAHdLxBshZjjQufFy6/WqGKyXGH64v0RsApcL tSIQprwBxdKlLiFBxlAsEO+Flxi/Ph1n07LBTmTXOOei3s2ymkMLMh2Jwg7FT5dc3LUIgNWw5OI 0TCuEKDP4D0jB2PD9AJ74JsjZtDMBURsRkQMr9mC7hU5M04Tbl5uU9Be+dL24NTkfO6a1FDKuIT d8ojHuKMKpOhdgfHrzDPpZISyR7S3iyn2GTEIHhl3nbljui91zZvHWF2/PtA== X-Received: by 2002:a05:6830:25d1:b0:7dc:da80:42b4 with SMTP id 46e09a7af769-7de9a1002c7mr4284996a34.24.1777475913099; Wed, 29 Apr 2026 08:18:33 -0700 (PDT) Received: from devvm29614.prn0.facebook.com ([2a03:2880:f812:6a::]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7deab99036asm1469135a34.17.2026.04.29.08.18.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Apr 2026 08:18:32 -0700 (PDT) Date: Wed, 29 Apr 2026 08:18:23 -0700 From: Bobby Eshleman To: Daniel Borkmann Cc: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Jonathan Corbet , Shuah Khan , Alex Shi , Yanteng Si , Dongliang Mu , Michael Chan , Pavan Chebbi , Joshua Washington , Harshitha Ramamurthy , Saeed Mahameed , Tariq Toukan , Mark Bloch , Leon Romanovsky , Alexander Duyck , kernel-team@meta.com, Nikolay Aleksandrov , Shuah Khan , David Wei , netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Stanislav Fomichev , Mina Almasry , Bobby Eshleman Subject: Re: [PATCH net-next 00/11] net: devmem: support devmem with netkit devices Message-ID: References: <20260428-tcp-dm-netkit-v1-0-719280eba4d2@meta.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Apr 29, 2026 at 02:08:31PM +0200, Daniel Borkmann wrote: > Hi Bobby, > > On 4/29/26 12:41 AM, Bobby Eshleman wrote: > > This series enables TCP devmem TX through netkit devices. > > > > Netkit now supports queue leasing. A physical NIC's RX queue can be > > leased to a netkit guest interface inside a container namespace. This > > gives the container a devmem-capable data path on the RX side (bind-rx, > > etc...). On the TX side, the container process binds to its netkit guest > > interface and sends traffic that netkit redirects (via BPF or ip > > forwarding) to the physical NIC for DMA. > [...] > Thanks for working on this, after the RX queue leasing got merged, I've > been looking into the same actually. :) > > I think the NETMEM_TX_* enum approach seems reasonable. > > What I have a PoC on is to build out TX queue leasing as first-class > symmetric infrastructure to complement the RX queue leasing - basically > I implemented an equivalent to the latter in netdev_nl_queue_create_doit > et al, so you can have independent RX and TX leases and per-queue > accountability, such that ynl queue-get op shows the full picture, and > lastly we could also enable AF_XDP TX-only support through this infra. > > Would you be open to collab on integrating both and migrating the devmem > code to work off an TX queue object? Next week is LSF/MM/BPF, are you > there by any chance to catch up in person? > Hey Daniel, Definitely am open to that. I will unfortunately not be at LSF/MM/BPF, but maybe we can schedule a meeting offline to sync up? On the approach, explicit TX queue leasing sounds like a better way to permit devmem's tx binding than implicitly via RX lease. Best, Bobby