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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 8356CC43457 for ; Tue, 21 Jul 2020 05:05:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6321F2080D for ; Tue, 21 Jul 2020 05:05:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728268AbgGUFFI (ORCPT ); Tue, 21 Jul 2020 01:05:08 -0400 Received: from mga07.intel.com ([134.134.136.100]:4957 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728214AbgGUFFG (ORCPT ); Tue, 21 Jul 2020 01:05:06 -0400 IronPort-SDR: bxpTRX0ySA3vgRt01tvHkWCyi6FjGBw4U4k/pKh91IhDaGqSeTGrwHJ1vEZkYt4Vqhkd8gopen N/7ZTpj7Pr3g== X-IronPort-AV: E=McAfee;i="6000,8403,9688"; a="214726587" X-IronPort-AV: E=Sophos;i="5.75,377,1589266800"; d="scan'208";a="214726587" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jul 2020 22:05:06 -0700 IronPort-SDR: l6cNtvZc24oLkjXurSvcax+JyVur6mu2T7kfb1C+VlHrPmvUcQ8QnLET38jg9blz6W+R2KqyS+ RjEIteyVD+1A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,377,1589266800"; d="scan'208";a="431855708" Received: from taktemur-mobl.ger.corp.intel.com (HELO localhost.localdomain) ([10.252.33.122]) by orsmga004.jf.intel.com with ESMTP; 20 Jul 2020 22:05:02 -0700 From: Magnus Karlsson To: magnus.karlsson@intel.com, bjorn.topel@intel.com, ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org, jonathan.lemon@gmail.com, maximmi@mellanox.com Cc: bpf@vger.kernel.org, jeffrey.t.kirsher@intel.com, anthony.l.nguyen@intel.com, maciej.fijalkowski@intel.com, maciejromanfijalkowski@gmail.com, cristian.dumitrescu@intel.com Subject: [PATCH bpf-next v4 11/14] xsk: add shared umem support between devices Date: Tue, 21 Jul 2020 07:04:05 +0200 Message-Id: <1595307848-20719-12-git-send-email-magnus.karlsson@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1595307848-20719-1-git-send-email-magnus.karlsson@intel.com> References: <1595307848-20719-1-git-send-email-magnus.karlsson@intel.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Add support to share a umem between different devices. This mode can be invoked with the XDP_SHARED_UMEM bind flag. Previously, sharing was only supported within the same device. Note that when sharing a umem between devices, just as in the case of sharing a umem between queue ids, you need to create a fill ring and a completion ring and tie them to the socket (with two setsockopts, one for each ring) before you do the bind with the XDP_SHARED_UMEM flag. This so that the single-producer single-consumer semantics of the rings can be upheld. Signed-off-by: Magnus Karlsson --- net/xdp/xsk.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index e897755..ec2a2df 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -701,14 +701,11 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) sockfd_put(sock); goto out_unlock; } - if (umem_xs->dev != dev) { - err = -EINVAL; - sockfd_put(sock); - goto out_unlock; - } - if (umem_xs->queue_id != qid) { - /* Share the umem with another socket on another qid */ + if (umem_xs->queue_id != qid || umem_xs->dev != dev) { + /* Share the umem with another socket on another qid + * and/or device. + */ xs->pool = xp_create_and_assign_umem(xs, umem_xs->umem); if (!xs->pool) { -- 2.7.4