From patchwork Thu Mar 11 15:28:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Fijalkowski, Maciej" X-Patchwork-Id: 12131975 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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,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 A9BE3C4161F for ; Thu, 11 Mar 2021 15:41:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 82EF864FF3 for ; Thu, 11 Mar 2021 15:41:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234289AbhCKPlY (ORCPT ); Thu, 11 Mar 2021 10:41:24 -0500 Received: from mga06.intel.com ([134.134.136.31]:60959 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234223AbhCKPlA (ORCPT ); Thu, 11 Mar 2021 10:41:00 -0500 IronPort-SDR: sKsdBe5YeeA/e7q3thTMGxjcM4GlvJlK5VWswJDERXUGsMcLBziSBDHMxIDwxO/QxhT1d2Rcd9 LuT0wdclmHYQ== X-IronPort-AV: E=McAfee;i="6000,8403,9920"; a="250048414" X-IronPort-AV: E=Sophos;i="5.81,241,1610438400"; d="scan'208";a="250048414" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Mar 2021 07:41:00 -0800 IronPort-SDR: OGQBeM47BRtoqt5AjathkYZz4NgGdDbldEPTb5xEmuNh0i7Ln5OSsXOjUXWNzUcI/Zzr2iGMAp 59Lk8yL2qaaQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,241,1610438400"; d="scan'208";a="589253400" Received: from ranger.igk.intel.com ([10.102.21.164]) by orsmga005.jf.intel.com with ESMTP; 11 Mar 2021 07:40:57 -0800 From: Maciej Fijalkowski To: bpf@vger.kernel.org, netdev@vger.kernel.org, daniel@iogearbox.net, ast@kernel.org Cc: bjorn.topel@intel.com, magnus.karlsson@intel.com, ciara.loftus@intel.com, john.fastabend@gmail.com, toke@redhat.com, Maciej Fijalkowski Subject: [PATCH v2 bpf-next 00/17] AF_XDP selftests improvements & bpf_link Date: Thu, 11 Mar 2021 16:28:53 +0100 Message-Id: <20210311152910.56760-1-maciej.fijalkowski@intel.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net -------------------------------------------------- v1 of xsk's bpf_link support can be found here: https://lore.kernel.org/bpf/20210215154638.4627-1-maciej.fijalkowski@intel.com/ Changes since v1: - selftests improvements and test case for bpf_link persistence itself - do not unload netlink-based prog when --force flag is set (John) - simplify return semantics in xsk_link_lookup (John) -------------------------------------------------- This set is another approach towards addressing the below issue: // load xdp prog and xskmap and add entry to xskmap at idx 10 $ sudo ./xdpsock -i ens801f0 -t -q 10 // add entry to xskmap at idx 11 $ sudo ./xdpsock -i ens801f0 -t -q 11 terminate one of the processes and another one is unable to work due to the fact that the XDP prog was unloaded from interface. Previous attempt was, to put it mildly, a bit broken, as there was no synchronization between updates to additional map, as Bjorn pointed out. See https://lore.kernel.org/netdev/20190603131907.13395-5-maciej.fijalkowski@intel.com/ In the meantime bpf_link was introduced and it seems that it can address the issue of refcounting the XDP prog on interface. Although the bpf_link is the meat of the set, selftests improvements are a bigger part of it. Overall, we've been able to reduce the complexity of xsk selftests by removing a bunch of synchronization resources and simplifying logic and structs. Last but not least, for multiqueue veth working with AF-XDP, ethtool's get_channels API needs to be implemented, so it's also included in that set. Note also that in order to make it work, a commit from bpf tree: veth: store queue_mapping independently of XDP prog presence https://lore.kernel.org/bpf/20210303152903.11172-1-maciej.fijalkowski@intel.com/ is needed. Thanks, Maciej Björn Töpel (3): selftests: xsk: remove thread attribute selftest: xsk: Remove mutex and condition variable selftests: xsk: Remove unused defines Maciej Fijalkowski (14): selftests: xsk: don't call worker_pkt_dump() for stats test selftests: xsk: remove struct ifaceconfigobj selftests: xsk: remove unused function selftests: xsk: remove inline keyword from source file selftests: xsk: simplify frame traversal in dumping thread libbpf: xsk: use bpf_link samples: bpf: do not unload prog within xdpsock selftests: xsk: remove thread for netns switch selftests: xsk: split worker thread selftests: xsk: remove Tx synchronization resources selftests: xsk: refactor teardown/bidi test cases and testapp_validate selftests: xsk: remove sync_mutex_tx and atomic var veth: implement ethtool's get_channels() callback selftests: xsk: implement bpf_link test drivers/net/veth.c | 12 + samples/bpf/xdpsock_user.c | 55 +- tools/lib/bpf/xsk.c | 139 ++++- tools/testing/selftests/bpf/test_xsk.sh | 2 +- tools/testing/selftests/bpf/xdpxceiver.c | 699 ++++++++++------------- tools/testing/selftests/bpf/xdpxceiver.h | 49 +- 6 files changed, 479 insertions(+), 477 deletions(-)