From patchwork Mon Feb 19 08:00:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Horatiu Vultur X-Patchwork-Id: 13562322 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 4661CC48BC3 for ; Mon, 19 Feb 2024 08:01:23 +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=zZAbYNhVqgfEPakOPjqJm/J05sPmd9D9rOpfAr+c/GU=; b=GVqA5/ym+GF+Tp ShCXbMxhoFpAHDDliQW8XWZ6SbSsDi8TIkn2hYpGl62e4wnRodBOXM3JlcEhlLcFDIDNSY/+JxAd/ gQ/AOlOSZkM/c8GkePZT60s9OO5L2lRdoOhNTYchaGqOWCd+eB5PxMctaGpkpCJB7w0Mv0iJPJ55g CURhvMgFGn6cyRzP0f6LRIv+ZbWXIpY0oF+qk4tbNj5h+G2KsrPtR7FZhJdm0bZSVL5UZyV1DCpub NZtcqGcvEn+jEFbHHAB+HvBYs16zF6JlV5ezo4L/wYD1eNzt3//D2XZROUrg0GQIZnthpY7sezmyj gUKsuK6+Sl624tlIQ0RA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rbyaK-00000009UTX-1enc; Mon, 19 Feb 2024 08:01:08 +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 1rbyaH-00000009URE-436i for linux-arm-kernel@lists.infradead.org; Mon, 19 Feb 2024 08:01:07 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1708329666; x=1739865666; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=rfQkQXfU5XnbLWnwEW1iiJydHy5t2btASLhVXbbDWdw=; b=o7TGhRmTYZF2XT1nrisU4e5Mrtwp+eCJl3uSf27mDp0B+DXo12k7bQBo 0UUcOevK6kjH8VSh31DX3wSjto74g3mtMw0Znh/WLtnykZ9DCD4ua1Q9P PUxiiNyp80FxdgkQkrql+kkpmOCE6NVwXdS/SVp5t8BDs6yh5MhC6mF8S r1oT4DGxDOvWwGQ634iojxBSWu9Vu+PTLru0TzakKc2H7GaJ1754q0ef8 FnkCr9Umkj1QG79So2lVMTAQnEvC+B83uA1kP4OXuDpxc1caKc89KAJJz cYsg/mgY772jWw0ROygPPaQvvyGKwJSlOCsS0DwgInpOcfTDQXBPShzRc Q==; X-CSE-ConnectionGUID: 0bIe6Jl+SMycL+aUC1NHPA== X-CSE-MsgGUID: XC9el0JIT7ONn6Wduk/pEg== X-IronPort-AV: E=Sophos;i="6.06,170,1705388400"; d="scan'208";a="247196761" 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; 19 Feb 2024 01:00:59 -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; Mon, 19 Feb 2024 01:00:49 -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; Mon, 19 Feb 2024 01:00:46 -0700 From: Horatiu Vultur To: , , , , , , , CC: , , , , , , , , Horatiu Vultur Subject: [PATCH net v3] net: sparx5: Add spinlock for frame transmission from CPU Date: Mon, 19 Feb 2024 09:00:43 +0100 Message-ID: <20240219080043.1561014-1-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-20240219_000106_152412_BA9B3F2B X-CRM114-Status: GOOD ( 15.28 ) 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 Fixes: f3cad2611a77 ("net: sparx5: add hostmode with phylink support") --- v2->v3: - add missing fix tag as it is targeting net 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;