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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 C817DC83000 for ; Tue, 28 Apr 2020 18:32:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A8CF221775 for ; Tue, 28 Apr 2020 18:32:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588098774; bh=uwHpq0c4se3+HxWbMzyYSyeGaIC4RLN0iuO/eA7PMvA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bppV8k1j0LexEy5hwPFikha/D3kaiE3LisrnVfN27l0TI7v0rxd4dLEJbbXhnUOLQ +0bVVjuCpOwAX7SO0cwnxq37KtFPOcDZIZupjYk3x0LuACTDhGjjl1d77fS3nOFwGF 1aLrOx6Ob4FKa20lCFq7bIu+TPOoDGqrOulJBBTU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729862AbgD1Scx (ORCPT ); Tue, 28 Apr 2020 14:32:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:49088 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729853AbgD1Sct (ORCPT ); Tue, 28 Apr 2020 14:32:49 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0199421775; Tue, 28 Apr 2020 18:32:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588098768; bh=uwHpq0c4se3+HxWbMzyYSyeGaIC4RLN0iuO/eA7PMvA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IoyMSh/F5eAgBPcdmTjV3AC0n3ac8Xgzvj2Mc8470/F3XAHxSVDZUqxYGR4SnpNa3 /bQQg1F9e6tMwh3covIh0O+7xBUJBc4GRo0xT6ToreIdhDA2UZU6uJBx/Qvb0SjtRz tYZYyYx69IPlU5AzBWmIcKRD75nyp0HO6uxF6Urk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Manoj Malviya , Rahul Lakkireddy , "David S. Miller" Subject: [PATCH 4.19 054/131] cxgb4: fix large delays in PTP synchronization Date: Tue, 28 Apr 2020 20:24:26 +0200 Message-Id: <20200428182231.757495996@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200428182224.822179290@linuxfoundation.org> References: <20200428182224.822179290@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rahul Lakkireddy [ Upstream commit bd019427bf3623ee3c7d2845cf921bbf4c14846c ] Fetching PTP sync information from mailbox is slow and can take up to 10 milliseconds. Reduce this unnecessary delay by directly reading the information from the corresponding registers. Fixes: 9c33e4208bce ("cxgb4: Add PTP Hardware Clock (PHC) support") Signed-off-by: Manoj Malviya Signed-off-by: Rahul Lakkireddy Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c | 27 +++++-------------------- drivers/net/ethernet/chelsio/cxgb4/t4_regs.h | 3 ++ 2 files changed, 9 insertions(+), 21 deletions(-) --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c @@ -311,32 +311,17 @@ static int cxgb4_ptp_adjtime(struct ptp_ */ static int cxgb4_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts) { - struct adapter *adapter = (struct adapter *)container_of(ptp, - struct adapter, ptp_clock_info); - struct fw_ptp_cmd c; + struct adapter *adapter = container_of(ptp, struct adapter, + ptp_clock_info); u64 ns; - int err; - memset(&c, 0, sizeof(c)); - c.op_to_portid = cpu_to_be32(FW_CMD_OP_V(FW_PTP_CMD) | - FW_CMD_REQUEST_F | - FW_CMD_READ_F | - FW_PTP_CMD_PORTID_V(0)); - c.retval_len16 = cpu_to_be32(FW_CMD_LEN16_V(sizeof(c) / 16)); - c.u.ts.sc = FW_PTP_SC_GET_TIME; - - err = t4_wr_mbox(adapter, adapter->mbox, &c, sizeof(c), &c); - if (err < 0) { - dev_err(adapter->pdev_dev, - "PTP: %s error %d\n", __func__, -err); - return err; - } + ns = t4_read_reg(adapter, T5_PORT_REG(0, MAC_PORT_PTP_SUM_LO_A)); + ns |= (u64)t4_read_reg(adapter, + T5_PORT_REG(0, MAC_PORT_PTP_SUM_HI_A)) << 32; /* convert to timespec*/ - ns = be64_to_cpu(c.u.ts.tm); *ts = ns_to_timespec64(ns); - - return err; + return 0; } /** --- a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h +++ b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h @@ -1896,6 +1896,9 @@ #define MAC_PORT_CFG2_A 0x818 +#define MAC_PORT_PTP_SUM_LO_A 0x990 +#define MAC_PORT_PTP_SUM_HI_A 0x994 + #define MPS_CMN_CTL_A 0x9000 #define COUNTPAUSEMCRX_S 5