From patchwork Thu Jan 9 22:42:46 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Anderson X-Patchwork-Id: 13933308 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 D272CE7719A for ; Thu, 9 Jan 2025 22:44:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=QE3eqh5wc4f4JZTZPBPucbaDDDy7F4dN4ZWKRzaggT4=; b=h2M9K4reFoJ3fPZ94hk1OYxEZi pD3SPD0j61T+Ao6nRGXP9GLRUi1rD80sih15QVIiUptnsuHnbMtxIxhKvhu0y6c4+uCgtcC2JwN8U MTEpCroBBE/1oe/P8Xqlj8gw9wtAaj0XIst7A3U70pNaWVF9raSbPv0mVYJXgQF0QSoM5pqAPEp5z bAUArr4y722AgQd9P1gtoMbMLy2w2hmuqwGwZEYQxReRiqmpTr2F+hw8P9qFSRT/6QL6jnP9IXe8j LyRhICsVRtHgJbNJqaeb5fpURWRHFJfj4jNEG+CIS9RVQGM1W+WF65Fn0mEX+nL7XhUF0uxhyxA1o aaU/x81Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tW1GP-0000000DTuU-2p5I; Thu, 09 Jan 2025 22:44:29 +0000 Received: from out-175.mta0.migadu.com ([91.218.175.175]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tW1FB-0000000DTji-3Myc for linux-arm-kernel@lists.infradead.org; Thu, 09 Jan 2025 22:43:15 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1736462583; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=QE3eqh5wc4f4JZTZPBPucbaDDDy7F4dN4ZWKRzaggT4=; b=gfOoS4A7wzvo3W+np3l6aMRQHtNh5Qyc5XmtEm3DWQNGiA8PEESsn3lSjzA0L/+DRs/u2P ujmBWCqcrcilKzlq3bzzn7fOUEmtm7Gv7aigYGiuo4EsY8NZ+tfKuiTONTg5gvnxJX2vUl thYFdmU+HT/KWhKuwNTKnYYjROy50CU= From: Sean Anderson To: Radhey Shyam Pandey , Shannon Nelson , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org Cc: Michal Simek , Simon Horman , Daniel Borkmann , Andy Chiu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sean Anderson Subject: [PATCH net v3] net: xilinx: axienet: Fix IRQ coalescing packet count overflow Date: Thu, 9 Jan 2025 17:42:46 -0500 Message-Id: <20250109224246.1866690-1-sean.anderson@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250109_144313_988971_7FF818D4 X-CRM114-Status: UNSURE ( 9.96 ) X-CRM114-Notice: Please train this message. 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 If coalece_count is greater than 255 it will not fit in the register and will overflow. This can be reproduced by running # ethtool -C ethX rx-frames 256 which will result in a timeout of 0us instead. Fix this by checking for invalid values and reporting an error. Signed-off-by: Sean Anderson Fixes: 8a3b7a252dca ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver") --- Changes in v3: - Validate and reject instead of silently clamping Changes in v2: - Use FIELD_MAX to extract the max value from the mask - Expand the commit message with an example on how to reproduce this issue drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index 0f4b02fe6f85..c2991aeccf2b 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -2056,6 +2056,12 @@ axienet_ethtools_set_coalesce(struct net_device *ndev, return -EBUSY; } + if (ecoalesce->rx_max_coalesced_frames > 255 || + ecoalesce->rx_max_coalesced_frames > 255) { + NL_SET_ERR_MSG(extack, "frames must be less than 256"); + return -EINVAL; + } + if (ecoalesce->rx_max_coalesced_frames) lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames; if (ecoalesce->rx_coalesce_usecs)