From patchwork Sat Jun 5 00:23:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinicius Costa Gomes X-Patchwork-Id: 12300949 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=-11.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_NONE,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 D9464C4743C for ; Sat, 5 Jun 2021 00:24:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C451C613D8 for ; Sat, 5 Jun 2021 00:24:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230270AbhFEAZ5 (ORCPT ); Fri, 4 Jun 2021 20:25:57 -0400 Received: from mga02.intel.com ([134.134.136.20]:53213 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229906AbhFEAZ4 (ORCPT ); Fri, 4 Jun 2021 20:25:56 -0400 IronPort-SDR: n/J59wQVrVOHOEJIa9rJiJ052QNSz/B7YSSTKRxdCbZ8ntDQhr6ss0rQn0dSJKH43zig/BoYa5 I/fJ6g3JdfHg== X-IronPort-AV: E=McAfee;i="6200,9189,10005"; a="191505922" X-IronPort-AV: E=Sophos;i="5.83,249,1616482800"; d="scan'208";a="191505922" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jun 2021 17:24:08 -0700 IronPort-SDR: FurWPIQxgq+h1KVjINEEeAORtwNZTNm5b4+wsUr+gf9BZXei9zI4xA3yO4L19WrJqN67SOWI4G tNyjMNDDLv7Q== X-IronPort-AV: E=Sophos;i="5.83,249,1616482800"; d="scan'208";a="446862943" Received: from lmrivera-mobl.amr.corp.intel.com (HELO localhost.localdomain) ([10.251.24.65]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jun 2021 17:24:08 -0700 From: Vinicius Costa Gomes To: intel-wired-lan@lists.osuosl.org Cc: Vinicius Costa Gomes , sasha.neftin@intel.com, anthony.l.nguyen@intel.com, linux-pci@vger.kernel.org, bhelgaas@google.com, netdev@vger.kernel.org, mlichvar@redhat.com, richardcochran@gmail.com, hch@infradead.org, helgaas@kernel.org Subject: [PATCH next-queue v5 0/4] igc: Add support for PCIe PTM Date: Fri, 4 Jun 2021 17:23:52 -0700 Message-Id: <20210605002356.3996853-1-vinicius.gomes@intel.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi, Changes from v4: - Improved commit messages (Bjorn Helgaas); Changes from v3: - More descriptive commit messages and comments (Bjorn Helgaas); - Added a pcie_ptm_enabled() helper (Bjorn Helgaas); Changes from v2: - Now the PTM timestamps are retrieved synchronously with the ioctl(); - Fixed some typos in constants; - The IGC_PTM_STAT register is write-1-to-clear, document this more clearly; Changes from v1: - This now should cross compile better, convert_art_ns_to_tsc() will only be used if CONFIG_X86_TSC is enabled; - PCIe PTM errors reported by the NIC are logged and PTM cycles are restarted in case an error is detected; Original cover letter (lightly edited): This adds support for PCIe PTM (Precision Time Measurement) to the igc driver. PCIe PTM allows the NIC and Host clocks to be compared more precisely, improving the clock synchronization accuracy. Patch 1/4 reverts a commit that made pci_enable_ptm() private to the PCI subsystem, reverting makes it possible for it to be called from the drivers. Patch 2/4 adds the pcie_ptm_enabled() helper. Patch 3/4 calls pci_enable_ptm() from the igc driver. Patch 4/4 implements the PCIe PTM support. It adds a workqueue that reads the PTM registers periodically and collects the information so a subsequent call to getcrosststamp() has all the timestamps needed. Some questions are raised (also pointed out in the commit message): 1. Using convert_art_ns_to_tsc() is too x86 specific, there should be a common way to create a 'system_counterval_t' from a timestamp. 2. convert_art_ns_to_tsc() says that it should only be used when X86_FEATURE_TSC_KNOWN_FREQ is true, but during tests it works even when it returns false. Should that check be done? Cheers, Vinicius Costa Gomes (4): Revert "PCI: Make pci_enable_ptm() private" PCI: Add pcie_ptm_enabled() igc: Enable PCIe PTM igc: Add support for PTP getcrosststamp() drivers/net/ethernet/intel/igc/igc.h | 1 + drivers/net/ethernet/intel/igc/igc_defines.h | 31 ++++ drivers/net/ethernet/intel/igc/igc_main.c | 6 + drivers/net/ethernet/intel/igc/igc_ptp.c | 182 +++++++++++++++++++ drivers/net/ethernet/intel/igc/igc_regs.h | 23 +++ drivers/pci/pci.h | 3 - drivers/pci/pcie/ptm.c | 9 + include/linux/pci.h | 10 + 8 files changed, 262 insertions(+), 3 deletions(-)