From patchwork Wed Aug 7 00:30:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Hall, Christopher S" X-Patchwork-Id: 13755572 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C9522770E for ; Wed, 7 Aug 2024 00:36:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722991019; cv=none; b=TXLhYF8GKkKLOTi7MAHb7XOUS7zsE604qJbbHZGzTndPMEgFl/GTihW7BU5Oa7o8IgT/yit4uvEkThtwqfALl7C0ywHEymBPYQ+/ucX+ndb97gMrFw2h+9ijEVMs0QPbwiDIRw2uXcuYdkr2+zy7XsbPv+lhv/r59F/OhB6qzzw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722991019; c=relaxed/simple; bh=Rdr9qX500IejMlvTst8ST2srghzPY596qYKAm+Pca6Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=hLxEi4hePs5kdj5TKL/yOviT+K7FPRLqiRSM3UR6mK3aapy6d6lGQMRHdfwVFeThZ6IEr5R/iF3b1MquyuJoRAmgkVZSv2W1MDxU1aPvbz8AM4/yKaGgyxnZytkcZUbZt/YRU6FitpPdy7FqhiTaIgFIPppWGeXzVLwkEdwlTyw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=E9cTdrhW; arc=none smtp.client-ip=192.198.163.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="E9cTdrhW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1722991018; x=1754527018; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Rdr9qX500IejMlvTst8ST2srghzPY596qYKAm+Pca6Q=; b=E9cTdrhWKKEGbU7ifc8TI3AxleWXA7PsJy1RsWmP+GDVGu/oKCXQJqXr CDTWbqCoCtryatlj80aB+4ZPTF6jhF7xS8pSvdeimfJrJAON9ElOcUsfn 0e8u4/dwdIRfSAk9XJj1oNXc3E8GizI/n/r1iajsZKrSDbqk8YZtqDKaR gdARzYr4fDrKypnlIOwy7MAHHeX5BIr04Y7GKFqNncG1cCCKz8UaqPKTQ Gdd+Qnfu93fJ8EVR1RuHaaYA565LZof3twSPvYjKeMFWqSUOeadUgdb48 3ORXQOcEQ/CxuZ5NRJo/nR2yS7NU18GY9ynr4IT6qdf4nm8PaYgmfDlL0 w==; X-CSE-ConnectionGUID: 40m+/cQVSCebPnX8CBTySg== X-CSE-MsgGUID: 0rPddeEKSlqS0WuQmI6JVQ== X-IronPort-AV: E=McAfee;i="6700,10204,11156"; a="31669762" X-IronPort-AV: E=Sophos;i="6.09,268,1716274800"; d="scan'208";a="31669762" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Aug 2024 17:36:58 -0700 X-CSE-ConnectionGUID: cSuwcZ+2RVGto+yMtdbE9g== X-CSE-MsgGUID: kvCrhZO1SAyCv7/j1r5Agw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,268,1716274800"; d="scan'208";a="61497023" Received: from timelab-spr09.ch.intel.com (HELO timelab-spr09.sc.intel.com) ([143.182.136.138]) by orviesa003.jf.intel.com with ESMTP; 06 Aug 2024 17:36:57 -0700 From: christopher.s.hall@intel.com To: intel-wired-lan@lists.osuosl.org Cc: netdev@vger.kernel.org, vinicius.gomes@intel.com, david.zage@intel.com, vinschen@redhat.com, rodrigo.cadore@l-acoustics.com, Christopher S M Hall Subject: [PATCH iwl-net v1 5/5] igc: Add lock preventing multiple simultaneous PTM transactions Date: Tue, 6 Aug 2024 17:30:32 -0700 Message-Id: <20240807003032.10300-6-christopher.s.hall@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240807003032.10300-1-christopher.s.hall@intel.com> References: <20240807003032.10300-1-christopher.s.hall@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Christopher S M Hall Add a mutex around the PTM transaction to prevent multiple transactors Multiple processes try to initiate a PTM transaction, one or all may fail. This can be reproduced by running two instances of the following: $ sudo phc2sys -O 0 -i tsn0 -m PHC2SYS exits with: "ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction fails Note: Normally two instance of PHC2SYS will not run, but one process should not break another. Fixes: a90ec8483732 ("igc: Add support for PTP getcrosststamp()") Signed-off-by: Christopher S M Hall --- drivers/net/ethernet/intel/igc/igc.h | 1 + drivers/net/ethernet/intel/igc/igc_ptp.c | 12 ++++++++++-- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h index c38b4d0f00ce..fbac02c79178 100644 --- a/drivers/net/ethernet/intel/igc/igc.h +++ b/drivers/net/ethernet/intel/igc/igc.h @@ -315,6 +315,7 @@ struct igc_adapter { struct timespec64 prev_ptp_time; /* Pre-reset PTP clock */ ktime_t ptp_reset_start; /* Reset time in clock mono */ struct system_time_snapshot snapshot; + struct mutex ptm_lock; /* Only allow one PTM transaction at a time */ char fw_version[32]; diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c index f770e39650ef..c70a6393c210 100644 --- a/drivers/net/ethernet/intel/igc/igc_ptp.c +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c @@ -1068,9 +1068,16 @@ static int igc_ptp_getcrosststamp(struct ptp_clock_info *ptp, { struct igc_adapter *adapter = container_of(ptp, struct igc_adapter, ptp_caps); + int ret; - return get_device_system_crosststamp(igc_phc_get_syncdevicetime, - adapter, &adapter->snapshot, cts); + /* This blocks until any in progress PTM transactions complete */ + mutex_lock(&adapter->ptm_lock); + + ret = get_device_system_crosststamp(igc_phc_get_syncdevicetime, + adapter, &adapter->snapshot, cts); + mutex_unlock(&adapter->ptm_lock); + + return ret; } static int igc_ptp_getcyclesx64(struct ptp_clock_info *ptp, @@ -1302,6 +1309,7 @@ void igc_ptp_reset(struct igc_adapter *adapter) wr32(IGC_PTM_CTRL, ctrl); /* Force the first cycle to run. */ + mutex_init(&adapter->ptm_lock); igc_ptm_trigger(hw); if (readx_poll_timeout_atomic(rd32, IGC_PTM_STAT, stat,