Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31A6CC61DA4 for ; Thu, 2 Feb 2023 10:45:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231614AbjBBKpL (ORCPT ); Thu, 2 Feb 2023 05:45:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232801AbjBBKot (ORCPT ); Thu, 2 Feb 2023 05:44:49 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE75F8CA95; Thu, 2 Feb 2023 02:44:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1675334683; x=1706870683; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=eYSUSNvcMtkcencWWMzkog0EFZDpyw2n8vcZMXE9pIg=; b=o8yYbE3k09OY2O53aqJlzzZjc2gKO0r6p8T7QXOdmd5mX7X5IIR7XOtR DpuSM/vb2Dk+srdNtQYRq4lHJ8WpXuTroT/VT/O/y6m6NF9HGNC97XdrW GWWF6m+JIgxrZyq+1hQ0mgDj4CyF5+GrRPWd4jJ+vzIH5SvP9D/wNeO+7 Pvjc9BPMi7bMn4U5/CW597clgAkwCxbh294vKkbqVWsiJ2sdmHUvrNKS+ cu3y1xvXZIBvv+ndOFi7wUHp1KRXA4sjwef5WjO6OxqSCehu7dB66425O LFeQA9AqB/D8jBP7j6u2UnLEEhu/IHjMbmJbkYWh13uT5tOmw0YsDOqw0 w==; X-IronPort-AV: E=Sophos;i="5.97,267,1669100400"; d="scan'208";a="199297152" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa5.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 02 Feb 2023 03:44:43 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Thu, 2 Feb 2023 03:44:41 -0700 Received: from DEN-LT-70577.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Thu, 2 Feb 2023 03:44:38 -0700 From: Daniel Machon To: CC: , , , , , , , , , , , , , , , , , Subject: [PATCH net-next 06/10] net: microchip: sparx5: add function for calculating PTP basetime Date: Thu, 2 Feb 2023 11:43:51 +0100 Message-ID: <20230202104355.1612823-7-daniel.machon@microchip.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230202104355.1612823-1-daniel.machon@microchip.com> References: <20230202104355.1612823-1-daniel.machon@microchip.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a new function for calculating PTP basetime, required by the stream gate scheduler to calculate gate state (open / close). Signed-off-by: Daniel Machon --- .../ethernet/microchip/sparx5/sparx5_main.h | 5 ++ .../ethernet/microchip/sparx5/sparx5_ptp.c | 3 +- .../ethernet/microchip/sparx5/sparx5_qos.c | 57 +++++++++++++++++++ 3 files changed, 63 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.h b/drivers/net/ethernet/microchip/sparx5/sparx5_main.h index 709cad534f50..fd71b2ede49a 100644 --- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.h +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.h @@ -396,6 +396,7 @@ int sparx5_ptp_txtstamp_request(struct sparx5_port *port, void sparx5_ptp_txtstamp_release(struct sparx5_port *port, struct sk_buff *skb); irqreturn_t sparx5_ptp_irq_handler(int irq, void *args); +int sparx5_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts); /* sparx5_vcap_impl.c */ int sparx5_vcap_init(struct sparx5 *sparx5); @@ -481,6 +482,10 @@ int sparx5_psfp_fm_add(struct sparx5 *sparx5, u32 uidx, struct sparx5_psfp_fm *fm, u32 *id); int sparx5_psfp_fm_del(struct sparx5 *sparx5, u32 id); +/* sparx5_qos.c */ +void sparx5_new_base_time(struct sparx5 *sparx5, const u32 cycle_time, + const ktime_t org_base_time, ktime_t *new_base_time); + /* Clock period in picoseconds */ static inline u32 sparx5_clk_period(enum sparx5_core_clockfreq cclock) { diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c b/drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c index 0ed1ea7727c5..af85d66248b2 100644 --- a/drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c @@ -476,8 +476,7 @@ static int sparx5_ptp_settime64(struct ptp_clock_info *ptp, return 0; } -static int sparx5_ptp_gettime64(struct ptp_clock_info *ptp, - struct timespec64 *ts) +int sparx5_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts) { struct sparx5_phc *phc = container_of(ptp, struct sparx5_phc, info); struct sparx5 *sparx5 = phc->sparx5; diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_qos.c b/drivers/net/ethernet/microchip/sparx5/sparx5_qos.c index 379e540e5e6a..ebfdbbf0a1ce 100644 --- a/drivers/net/ethernet/microchip/sparx5/sparx5_qos.c +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_qos.c @@ -9,6 +9,63 @@ #include "sparx5_main.h" #include "sparx5_qos.h" +/* Calculate new base_time based on cycle_time. + * + * The hardware requires a base_time that is always in the future. + * We define threshold_time as current_time + (2 * cycle_time). + * If base_time is below threshold_time this function recalculates it to be in + * the interval: + * threshold_time <= base_time < (threshold_time + cycle_time) + * + * A very simple algorithm could be like this: + * new_base_time = org_base_time + N * cycle_time + * using the lowest N so (new_base_time >= threshold_time + */ +void sparx5_new_base_time(struct sparx5 *sparx5, const u32 cycle_time, + const ktime_t org_base_time, ktime_t *new_base_time) +{ + ktime_t current_time, threshold_time, new_time; + struct timespec64 ts; + u64 nr_of_cycles_p2; + u64 nr_of_cycles; + u64 diff_time; + + new_time = org_base_time; + + sparx5_ptp_gettime64(&sparx5->phc[SPARX5_PHC_PORT].info, &ts); + current_time = timespec64_to_ktime(ts); + threshold_time = current_time + (2 * cycle_time); + diff_time = threshold_time - new_time; + nr_of_cycles = div_u64(diff_time, cycle_time); + nr_of_cycles_p2 = 1; /* Use 2^0 as start value */ + + if (new_time >= threshold_time) { + *new_base_time = new_time; + return; + } + + /* Calculate the smallest power of 2 (nr_of_cycles_p2) + * that is larger than nr_of_cycles. + */ + while (nr_of_cycles_p2 < nr_of_cycles) + nr_of_cycles_p2 <<= 1; /* Next (higher) power of 2 */ + + /* Add as big chunks (power of 2 * cycle_time) + * as possible for each power of 2 + */ + while (nr_of_cycles_p2) { + if (new_time < threshold_time) { + new_time += cycle_time * nr_of_cycles_p2; + while (new_time < threshold_time) + new_time += cycle_time * nr_of_cycles_p2; + new_time -= cycle_time * nr_of_cycles_p2; + } + nr_of_cycles_p2 >>= 1; /* Next (lower) power of 2 */ + } + new_time += cycle_time; + *new_base_time = new_time; +} + /* Max rates for leak groups */ static const u32 spx5_hsch_max_group_rate[SPX5_HSCH_LEAK_GRP_CNT] = { 1048568, /* 1.049 Gbps */ -- 2.34.1