From patchwork Sun Feb 7 08:19:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Chulski X-Patchwork-Id: 12072601 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=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 24EEDC433DB for ; Sun, 7 Feb 2021 08:20:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DCE7464EA7 for ; Sun, 7 Feb 2021 08:20:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229561AbhBGIUs (ORCPT ); Sun, 7 Feb 2021 03:20:48 -0500 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:5670 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229570AbhBGIUp (ORCPT ); Sun, 7 Feb 2021 03:20:45 -0500 Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 1178BjfA012026; Sun, 7 Feb 2021 00:19:45 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=pfpt0220; bh=p7LIXipTBOIhUQ64UgfKYEgES92zLGVjk5ZaAQiralQ=; b=gJq8RfVA8YxsCVl8LAp1dr+TjTgtDdkGaKEIs7w6FSZ8QWGGuc+b10cCXnyxhQM7fh4i tzgnciNv3qan3NFK4htlV+6hmyAZx3CytmDpfwa8KVqehnvcVB0uhZvwj1EiQERTkdRk 54TPb/SmOM9XklECdsxerFjQKHYALTESvsXpt/ycHENu4doScEV634A7lVg0hbgWp6ph T6KRApDztm4ioo2bFYmwJ6a4EPYDUaLyq/giIylgA0EaNXl+fhO4E//FsnuFDNb5WVZQ gTrrggkDvcihipUaI6XfWRYeR5dhh9C5/Y94tJtGK7vxbVVGePX4zSHJdV1u9AcxRYdV yw== Received: from dc5-exch02.marvell.com ([199.233.59.182]) by mx0b-0016f401.pphosted.com with ESMTP id 36hugq1ky1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Sun, 07 Feb 2021 00:19:45 -0800 Received: from SC-EXCH02.marvell.com (10.93.176.82) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sun, 7 Feb 2021 00:19:43 -0800 Received: from DC5-EXCH02.marvell.com (10.69.176.39) by SC-EXCH02.marvell.com (10.93.176.82) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sun, 7 Feb 2021 00:19:43 -0800 Received: from maili.marvell.com (10.69.176.80) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Sun, 7 Feb 2021 00:19:43 -0800 Received: from stefan-pc.marvell.com (stefan-pc.marvell.com [10.5.25.21]) by maili.marvell.com (Postfix) with ESMTP id 6EA0E3F7040; Sun, 7 Feb 2021 00:19:39 -0800 (PST) From: To: CC: , , , , , , , , , , , , , , , , Subject: [RESEND PATCH v8 net-next 00/15] net: mvpp2: Add TX Flow Control support Date: Sun, 7 Feb 2021 10:19:09 +0200 Message-ID: <1612685964-21890-1-git-send-email-stefanc@marvell.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.737 definitions=2021-02-07_03:2021-02-05,2021-02-07 signatures=0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Stefan Chulski Armada hardware has a pause generation mechanism in GOP (MAC). The GOP generate flow control frames based on an indication programmed in Ports Control 0 Register. There is a bit per port. However assertion of the PortX Pause bits in the ports control 0 register only sends a one time pause. To complement the function the GOP has a mechanism to periodically send pause control messages based on periodic counters. This mechanism ensures that the pause is effective as long as the Appropriate PortX Pause is asserted. Problem is that Packet Processor that actually can drop packets due to lack of resources not connected to the GOP flow control generation mechanism. To solve this issue Armada has firmware running on CM3 CPU dedicated for Flow Control support. Firmware monitors Packet Processor resources and asserts XON/XOFF by writing to Ports Control 0 Register. MSS shared SRAM memory used to communicate between CM3 firmware and PP2 driver. During init PP2 driver informs firmware about used BM pools, RXQs, congestion and depletion thresholds. The pause frames are generated whenever congestion or depletion in resources is detected. The back pressure is stopped when the resource reaches a sufficient level. So the congestion/depletion and sufficient level implement a hysteresis that reduces the XON/XOFF toggle frequency. Packet Processor v23 hardware introduces support for RX FIFO fill level monitor. Patch "add PPv23 version definition" to differ between v23 and v22 hardware. Patch "add TX FC firmware check" verifies that CM3 firmware supports Flow Control monitoring. v7 --> v8 - Reorder "always compare hw-version vs MVPP21" and "add PPv23 version definition" commits - Typo fixes - Remove condition fix from "add RXQ flow control configurations" v6 --> v7 - Reduce patch set from 18 to 15 patches - Documentation change combined into a single patch - RXQ and BM size change combined into a single patch - Ring size change check moved into "add RXQ flow control configurations" commit v5 --> v6 - No change v4 --> v5 - Add missed Signed-off - Fix warnings in patches 3 and 12 - Add revision requirement to warning message - Move mss_spinlock into RXQ flow control configurations patch - Improve FCA RXQ non occupied descriptor threshold commit message v3 --> v4 - Remove RFC tag v2 --> v3 - Remove inline functions - Add PPv2.3 description into marvell-pp2.txt - Improve mvpp2_interrupts_mask/unmask procedure - Improve FC enable/disable procedure - Add priv->sram_pool check - Remove gen_pool_destroy call - Reduce Flow Control timer to x100 faster v1 --> v2 - Add memory requirements information - Add EPROBE_DEFER if of_gen_pool_get return NULL - Move Flow control configuration to mvpp2_mac_link_up callback - Add firmware version info with Flow control support Konstantin Porotchkin (1): dts: marvell: add CM3 SRAM memory to cp11x ethernet device tree Stefan Chulski (14): doc: marvell: add cm3-mem and PPv2.3 description net: mvpp2: add CM3 SRAM memory map net: mvpp2: always compare hw-version vs MVPP21 net: mvpp2: add PPv23 version definition net: mvpp2: increase BM pool and RXQ size net: mvpp2: add FCA periodic timer configurations net: mvpp2: add FCA RXQ non occupied descriptor threshold net: mvpp2: enable global flow control net: mvpp2: add RXQ flow control configurations net: mvpp2: add ethtool flow control configuration support net: mvpp2: add BM protection underrun feature support net: mvpp2: add PPv23 RX FIFO flow control net: mvpp2: set 802.3x GoP Flow Control mode net: mvpp2: add TX FC firmware check Documentation/devicetree/bindings/net/marvell-pp2.txt | 4 +- arch/arm64/boot/dts/marvell/armada-cp11x.dtsi | 10 + drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 128 ++++- drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 563 ++++++++++++++++++-- 4 files changed, 655 insertions(+), 50 deletions(-)