From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792523941; b=bdZsJipmn7HuuQaqPofFrpBeM4c9gYymmQ26TD+SpztUN63+gG0MVpWvA7qJPhZ4yiLr udbL4A52G0aUPvY6g1gOfQvUyNq5IxtAl7XcSbCwIgWleKnolHIKRR+rJs+dwoRur8vik LNA7jJUxxHjpAWf+88frlTOAN5hb1z2tIRGQT9s52sBXvgbMiVVYiKWKJZj8YtcYvyI07 SnMU/6NlQbfihuaROPSmORcl96EBbl9NjHP9JNRvgSlpkAunFAk/6H9VQtMoaEnplPNih a1RMzq9j6KFK6aeQ01BvTz/Hq61Zs8R3tRGIigbTq++ded5KQyc2+0/b+Wf47BdWrUg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792523941; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: In-Reply-To:References:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=o+qYngWD3VtHRYJROR8r2QEagYzTVh9jUdoxhwafRww=; b=gdoHODeoncCBU+8sItiS/rXB3QTdA/8BwDlyLDXF1ZPBdhhS8CFsMBnOU+TPrr2FiidK eCIK/rSyl/0jEjop2RsAIyX0tYFJ0D2nPsigSxWOO3U7dE/ZKveGR3BjNbKOA3UWJb74Q vu/6iHnvzpJyUEKu7c5Zav/oeNQATS4Jz75W/fAL862XUanLRj3+PYI5dHtGsNX/IyLJY C2MICUA03EnFVAN2Yq4kfGJAnLkcZMeHgZIGQNpqNvvBNXg8zT+B2S8RZiH4OurGz9oKp /njZaLAtnbcN4QO4PeoMh5wxIbWg9AQrHjg9z+bXYDeEeJytPgxdORv9ooeSU07BPDw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=A7w0gEdO; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BDE96606A319; Tue, 20 Oct 2026 19:19:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=A7w0gEdO Received: by smtp.kernel.org (Postfix) with ESMTPSA id 921281F000C9; Tue, 20 Oct 2026 19:18:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792523940; bh=o+qYngWD3VtHRYJROR8r2QEagYzTVh9jUdoxhwafRww=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=A7w0gEdOvYzmk0vkW1JwU8bkYmH1HgaxOPga0sFNm0yLcYM4qvuuthmiN2t9Vfdoz Cvd4nrhYU5g2767tUif4Olx3uzuA/n46c9VtZTpU9WVxwL3YptLYYmWfvH3KroQ5Dv lWcBo5Qsj0pQHd7fBmqd0z0hPK+h7fEvL4kUx4Cf4987ztpjXd5CyKl5iAy+0FURRY 9bvyzOZvLD2ZovXoR9m02gJzdFd6jpTAWE45BDZ1zpEeJsVqIGwY2blTooVEy7m6e5 MEg/4Um77dGmgbveH57cGzYzZiXaO9DwLdLyfo9Y4AkHpPdJWnWc5E/IUoMft3kNva 1dzazHcVxQ7kg== Date: Tue, 20 Oct 2026 12:18:58 -0700 From: Jakub Kicinski To: Mina Almasry Cc: Pavel Begunkov , David Wei , Stanislav Fomichev , Taehee Yoo , Paolo Abeni , Kaiyuan Zhang , Bobby Eshleman , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, Andrew Lunn , "David S. Miller" , Eric Dumazet , Jesper Dangaard Brouer , Ilias Apalodimas , Simon Horman , Shuah Khan , Sumit Semwal , "Christian =?UTF-8?B?S8O2bmln?=" , Dragos Tatulea , Nikolay Aleksandrov , Daniel Borkmann , Tariq Toukan , Kaifeng Wang Subject: Re: [PATCH net v4 3/4] netdevsim: support devmem RX and TX bindings Message-ID: <20261020121858.3b9107c5@kernel.org> In-Reply-To: <20261015163915.1166043-4-almasrymina@google.com> References: <20261015163915.1166043-1-almasrymina@google.com> <20261015163915.1166043-4-almasrymina@google.com> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 15 Oct 2026 16:39:14 +0000 Mina Almasry wrote: > Set a 64-bit DMA mask on nsim_bus_dev, enable NETMEM_TX_DMA on the > netdevsim net_device, and configure page_pool instances with > PP_FLAG_ALLOW_UNREADABLE_NETMEM and queue_idx, plus PP_FLAG_DMA_MAP | > PP_FLAG_DMA_SYNC_DEV when CONFIG_HAS_DMA is set, so devmem bind-rx and > bind-tx netlink operations can be tested against netdevsim in software > selftests. Slightly worried this will bring a bunch of maintenance burden and "bugs" in netdevsim. IOW that this will be more pain than gain.