From patchwork Thu Feb 15 08:33:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Horatiu Vultur X-Patchwork-Id: 13557647 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 37D1CC4829E for ; Thu, 15 Feb 2024 08:34:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=JtWyuvxdxM7Cs54ML+WM/MRjKZCFG7WeisQcepCGoI0=; b=n7JnMAH+KVI46D E3Lvhyk5OnghfajaAvtLPsTrO/01RotZDvyoBBYCGPssuXcuENIEKU95/OOce1MqDWt0nkxadnMq1 8D2186Qz/bI6Grcwc/PK8iMU3QjiI0LVS22NhIi/mwK8whGRGlUfCv1HFx/jhv7VWo4ImrmSbG4q4 YMkwqvNWxcMafMpiqjgYDXF2cIDWyNhKp2MpxpF9ls8iEvMmLTig2sxjOUd423QmFYE0o2Xjelvi+ VkyDQNNKAc+ONtc3UUr2qleetGFYtiO8GqKKfShInL5ce672eWj8PHnyeypPsnj59a8Svh26//I8d GD2UfdO7MDNJIDCEzd4g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1raXC3-0000000FMOt-2s4I; Thu, 15 Feb 2024 08:34:07 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1raXC0-0000000FMNw-3oiM for linux-arm-kernel@lists.infradead.org; Thu, 15 Feb 2024 08:34:06 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1707986044; x=1739522044; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=1PN5B4HatVU4lz03ulC8NL9fJ0XJu/MDPjB+SmKs/Ow=; b=LQDmy7rKj1QDFFvgLLo0p1lYSdHWC3Kim/Y6v2rsaw+94ufAzsywR3Tt iyhdgAQ+iKw+4kc9UmXgz+hdwizJbXhxp385nyhVX6pL7jy02O90r7HDe 0Re5i6dZ22GQE4mE/ZiaKlkPBDpmHW105a/YaFpmk0XG5C7Do2+AUq7bl WFkkEEgTlKh/xSpfEbB3tCIn2YJ4Z3TH8g1IfdQsUwV2n/6FDvkqNpbs/ JLfa5LUdk8m88Ak8pjcH8KUFreYBHVe0PWeVhPdjrxT+/hY9NjGyx/Rbm j4YJZpZI9npncCZ87ksXEXN+8Mp/SM6JoWPo5gRTdJo5wKkp1LchpvpSo g==; X-CSE-ConnectionGUID: 1+ZJrS8eQVCWRu3QTzhT8A== X-CSE-MsgGUID: bM0MQsLhRxaPsBiqvRBQLA== X-IronPort-AV: E=Sophos;i="6.06,161,1705388400"; d="scan'208";a="247019029" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa5.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 15 Feb 2024 01:34:04 -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 15.1.2507.35; Thu, 15 Feb 2024 01:33:40 -0700 Received: from DEN-DL-M31836.microsemi.net (10.10.85.11) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.35 via Frontend Transport; Thu, 15 Feb 2024 01:33:37 -0700 From: Horatiu Vultur To: , , , , , , , CC: , , , , , , , , Horatiu Vultur Subject: [PATCH net v2] net: sparx5: Add spinlock for frame transmission from CPU Date: Thu, 15 Feb 2024 09:33:33 +0100 Message-ID: <20240215083333.2139380-1-horatiu.vultur@microchip.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240215_003404_974104_CF5CB01A X-CRM114-Status: GOOD ( 14.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Both registers used when doing manual injection or fdma injection are shared between all the net devices of the switch. It was noticed that when having two process which each of them trying to inject frames on different ethernet ports, that the HW started to behave strange, by sending out more frames then expected. When doing fdma injection it is required to set the frame in the DCB and then make sure that the next pointer of the last DCB is invalid. But because there is no locks for this, then easily this pointer between the DCB can be broken and then it would create a loop of DCBs. And that means that the HW will continuously transmit these frames in a loop. Until the SW will break this loop. Therefore to fix this issue, add a spin lock for when accessing the registers for manual or fdma injection. Signed-off-by: Horatiu Vultur Reviewed-by: Daniel Machon --- v1->v2: - target net instead of net-next --- drivers/net/ethernet/microchip/sparx5/sparx5_main.c | 1 + drivers/net/ethernet/microchip/sparx5/sparx5_main.h | 1 + drivers/net/ethernet/microchip/sparx5/sparx5_packet.c | 2 ++ 3 files changed, 4 insertions(+) diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c index d1f7fc8b1b71a..3c066b62e6894 100644 --- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c @@ -757,6 +757,7 @@ static int mchp_sparx5_probe(struct platform_device *pdev) platform_set_drvdata(pdev, sparx5); sparx5->pdev = pdev; sparx5->dev = &pdev->dev; + spin_lock_init(&sparx5->tx_lock); /* Do switch core reset if available */ reset = devm_reset_control_get_optional_shared(&pdev->dev, "switch"); diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.h b/drivers/net/ethernet/microchip/sparx5/sparx5_main.h index 6f565c0c0c3dc..316fed5f27355 100644 --- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.h +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.h @@ -280,6 +280,7 @@ struct sparx5 { int xtr_irq; /* Frame DMA */ int fdma_irq; + spinlock_t tx_lock; /* lock for frame transmission */ struct sparx5_rx rx; struct sparx5_tx tx; /* PTP */ diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c b/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c index 6db6ac6a3bbc2..ac7e1cffbcecf 100644 --- a/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c @@ -244,10 +244,12 @@ netdev_tx_t sparx5_port_xmit_impl(struct sk_buff *skb, struct net_device *dev) } skb_tx_timestamp(skb); + spin_lock(&sparx5->tx_lock); if (sparx5->fdma_irq > 0) ret = sparx5_fdma_xmit(sparx5, ifh, skb); else ret = sparx5_inject(sparx5, ifh, skb, dev); + spin_unlock(&sparx5->tx_lock); if (ret == -EBUSY) goto busy;