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 X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4605C432C3 for ; Sun, 1 Dec 2019 16:37:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9BE2C215F1 for ; Sun, 1 Dec 2019 16:37:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jBJCNYV7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727169AbfLAQf7 (ORCPT ); Sun, 1 Dec 2019 11:35:59 -0500 Received: from mail-il1-f196.google.com ([209.85.166.196]:36697 "EHLO mail-il1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726393AbfLAQf7 (ORCPT ); Sun, 1 Dec 2019 11:35:59 -0500 Received: by mail-il1-f196.google.com with SMTP id b15so10940227iln.3; Sun, 01 Dec 2019 08:35:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=EmKXPT8/zzRPMHZdVznWwaEqUYddRfodakHAFbk74gY=; b=jBJCNYV7E9qH9/FnvkjHwjWx5oRkv2t9fLyI8atyKOxXUumjx7wHBM38zb9ReMx8U2 USGKsR3ENN8rxtghmGCxxtIRqixfCTbjiMV1l+u9XQGQf2qtl7u+K4JZbssMjHKR6/pB NfGSe7cVzV1UBiPaiCIj63W4Jw1gaICoIKwjRL3BUCSlltKdkkbRrtfELlEJk2mqkNuP fxc1ghZ8tyyEkNXnuJWYloKCmZ0KDKEelCKvtbDB/e7cehbFZBxCP3G5H++EUS8PowYP MzZeVozXr8EC+YomO5nhX3fcxzCp+Cu/S5ss9+Hx33yNMmcU5NCo2GhTYsn+MnvSAaUw LEcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=EmKXPT8/zzRPMHZdVznWwaEqUYddRfodakHAFbk74gY=; b=jcdlYxcmZ09qxlVLFXXhPY5UbIhKqjYCI2DYad6iA2NVy7oHSUrh4JBfzgA5oRFdiM qKPx0dWfFiRHanmAVShmlpPqVya0wk+rEmOvabIfQgCS6Zgxmu0dP7eEGbUqdPGI+6e1 uCYOvfr6zQAGZyGTeo46YU4Y3G0wKJnP/bEAdjEB9KFG77BYO79VY8BI83g6TkOcdsBJ 5ZHu5aVTJm8mL7bqykYgLxv/Ds18J1UrJilorAM6ErX+Ky60FTicmIrKnMnwg0ICCtoG 2QOEOLz+TSqvDJGWsZabX0DXhzRyNHMkQAkWW7grI5eJc+DP6TM1RBo9BhB+VgXwj3il cylA== X-Gm-Message-State: APjAAAXLmpiV0Xiof9IcbxMY5pyudI6O7u2rwjiMf2/YtUmLG8XUdHBq Co3D8PMZoSXIR/OvYf0RJ0CAh0cz X-Google-Smtp-Source: APXvYqwIGHpUDCTLx6NUYZvnwluVz7GM9HsJnDjkWaPYpZXaxx4LTfh/9h7LO4SsISF4tXoychuGZw== X-Received: by 2002:a92:3b19:: with SMTP id i25mr16713300ila.85.1575218158458; Sun, 01 Dec 2019 08:35:58 -0800 (PST) Received: from dahern-DO-MB.local ([2601:282:800:fd80:fd6b:fde:b20f:61ed]) by smtp.googlemail.com with ESMTPSA id e73sm256972iof.63.2019.12.01.08.35.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 01 Dec 2019 08:35:57 -0800 (PST) Subject: Re: [RFC net-next 07/18] tun: set offloaded xdp program To: Prashant Bhole , "David S . Miller" , "Michael S . Tsirkin" Cc: Jason Wang , Alexei Starovoitov , Daniel Borkmann , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko , netdev@vger.kernel.org, qemu-devel@nongnu.org, kvm@vger.kernel.org References: <20191126100744.5083-1-prashantbhole.linux@gmail.com> <20191126100744.5083-8-prashantbhole.linux@gmail.com> From: David Ahern Message-ID: Date: Sun, 1 Dec 2019 09:35:56 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20191126100744.5083-8-prashantbhole.linux@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 11/26/19 4:07 AM, Prashant Bhole wrote: > From: Jason Wang > > This patch introduces an ioctl way to set an offloaded XDP program > to tun driver. This ioctl will be used by qemu to offload XDP program > from virtio_net in the guest. > > Signed-off-by: Jason Wang > Signed-off-by: Prashant Bhole > --- > drivers/net/tun.c | 19 ++++++++++++++----- > include/uapi/linux/if_tun.h | 1 + > 2 files changed, 15 insertions(+), 5 deletions(-) > > diff --git a/drivers/net/tun.c b/drivers/net/tun.c > index d078b4659897..ecb49101b0b5 100644 > --- a/drivers/net/tun.c > +++ b/drivers/net/tun.c > @@ -241,6 +241,7 @@ struct tun_struct { > struct bpf_prog __rcu *xdp_prog; > struct tun_prog __rcu *steering_prog; > struct tun_prog __rcu *filter_prog; > + struct tun_prog __rcu *offloaded_xdp_prog; I have been looking into running XDP pograms in the TX path of a tap device [1] where the program is installed and managed by a process in the host. The code paths are the same as what you are doing with XDP offload, so how about calling this xdp_prog_tx? [1] https://github.com/dsahern/linux/commit/f2303d05187c8a604cdb70b288338e9b1d1b0db6