From mboxrd@z Thu Jan 1 00:00:00 1970 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=-20.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 7EB0DC43460 for ; Fri, 9 Apr 2021 00:39:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 49808610FB for ; Fri, 9 Apr 2021 00:39:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233146AbhDIAjY (ORCPT ); Thu, 8 Apr 2021 20:39:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44374 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232996AbhDIAjW (ORCPT ); Thu, 8 Apr 2021 20:39:22 -0400 Received: from mail-qt1-x829.google.com (mail-qt1-x829.google.com [IPv6:2607:f8b0:4864:20::829]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD707C061760; Thu, 8 Apr 2021 17:39:10 -0700 (PDT) Received: by mail-qt1-x829.google.com with SMTP id u8so2962319qtq.12; Thu, 08 Apr 2021 17:39:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=OvFnHWl8/4Gx0jlI2rHNT0cAkiLDkU+mFrazaADwN18=; b=JBZtwNsEfIwjHe5297rgjYqVHfpF0YZC0D3V7g4PPOea6/+RtR4APk9xOnSnalyyLn 7bHYHPDFY+AzHIheWawwullU/JSjrvSWEzHdFQ3iQirGf6/AzhClMsMbqXIRQvclb9hl 4UIZqXE6fIXz6llMYGGubgRBx9P/udBISzAOTRGh6fQgQCiw/Ttp786+Ay4NwswxiHQ7 TLo3qEmaRCA6hC/I11cTA5WTs1zcpnBBzZgVuJ0S1O8pchYh2UoA22XPCtHlqK8r+x03 e9A4xy8f+5HFq1ki7FZVjx0to3nVIFG4+9HR5rKyfkEiTipta727mdcJedxQqmaaOEPl eV0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=OvFnHWl8/4Gx0jlI2rHNT0cAkiLDkU+mFrazaADwN18=; b=XBAtU5vhiUnoyU6fVnltVze+m1tfHowhf9AAR0O4BgFg96ZgNOJ20Td3TkXmVmFbAH xLoiJUkw3eAnK3YzomlcAcMMpEgVDW1PsHWPm30z9DOs9FVdJF1ntstqFGpeuAzhAxvK dtFBt+Rb2xeue2MaS3x46K3cPlMbKATZtJ2loulKA9qGrRiRX8Mvk6H+K8CGW8YnGi2b aDVyVlydRBfyEqjXfT0xc6aAiEYr8Qd8Al+ac3enkjI+1E8wrtpyWBAwQQF/0H7TlPVZ gGnH0PKBdicEnysPHokTNNieCndCvuINsdrT0+8j71kdrBH16/w+JxGuOWK3WueOEzzP fjow== X-Gm-Message-State: AOAM533kA372PgWQQ4ng+muemxEGC+gVvqSk4R3LNxbNbes62NZUKHJl h2cNaeKlr2224wSiIhEMh/E= X-Google-Smtp-Source: ABdhPJzkeKXFzOvud5n5WrTedvzKVK/dvgDboBn4SoZixRuf6/pMOJWaID5PesTPaHOXYsWfZYbe3A== X-Received: by 2002:a05:622a:1103:: with SMTP id e3mr10594081qty.346.1617928749337; Thu, 08 Apr 2021 17:39:09 -0700 (PDT) Received: from localhost.localdomain ([198.52.185.246]) by smtp.gmail.com with ESMTPSA id f12sm819766qti.63.2021.04.08.17.39.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Apr 2021 17:39:09 -0700 (PDT) From: Sven Van Asbroeck X-Google-Original-From: Sven Van Asbroeck To: Bryan Whitehead , David S Miller , Jakub Kicinski , George McCollister Cc: Sven Van Asbroeck , Heiner Kallweit , Andrew Lunn , UNGLinuxDriver@microchip.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net v1] lan743x: fix ethernet frame cutoff issue Date: Thu, 8 Apr 2021 20:39:04 -0400 Message-Id: <20210409003904.8957-1-TheSven73@gmail.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sven Van Asbroeck The ethernet frame length is calculated incorrectly. Depending on the value of RX_HEAD_PADDING, this may result in ethernet frames that are too short (cut off at the end), or too long (garbage added to the end). Fix by calculating the ethernet frame length correctly. For added clarity, use the ETH_FCS_LEN constant in the calculation. Many thanks to Heiner Kallweit for suggesting this solution. Fixes: 3e21a10fdea3 ("lan743x: trim all 4 bytes of the FCS; not just 2") Link: https://lore.kernel.org/lkml/20210408172353.21143-1-TheSven73@gmail.com/ Signed-off-by: Sven Van Asbroeck --- Tree: git://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git # 864db232dc70 To: Bryan Whitehead To: "David S. Miller" To: Jakub Kicinski To: George McCollister Cc: Heiner Kallweit Cc: Andrew Lunn Cc: UNGLinuxDriver@microchip.com Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org drivers/net/ethernet/microchip/lan743x_main.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c index 1c3e204d727c..7b6794aa8ea9 100644 --- a/drivers/net/ethernet/microchip/lan743x_main.c +++ b/drivers/net/ethernet/microchip/lan743x_main.c @@ -885,8 +885,8 @@ static int lan743x_mac_set_mtu(struct lan743x_adapter *adapter, int new_mtu) } mac_rx &= ~(MAC_RX_MAX_SIZE_MASK_); - mac_rx |= (((new_mtu + ETH_HLEN + 4) << MAC_RX_MAX_SIZE_SHIFT_) & - MAC_RX_MAX_SIZE_MASK_); + mac_rx |= (((new_mtu + ETH_HLEN + ETH_FCS_LEN) + << MAC_RX_MAX_SIZE_SHIFT_) & MAC_RX_MAX_SIZE_MASK_); lan743x_csr_write(adapter, MAC_RX, mac_rx); if (enabled) { @@ -1944,7 +1944,7 @@ static int lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index) struct sk_buff *skb; dma_addr_t dma_ptr; - buffer_length = netdev->mtu + ETH_HLEN + 4 + RX_HEAD_PADDING; + buffer_length = netdev->mtu + ETH_HLEN + ETH_FCS_LEN + RX_HEAD_PADDING; descriptor = &rx->ring_cpu_ptr[index]; buffer_info = &rx->buffer_info[index]; @@ -2040,7 +2040,7 @@ lan743x_rx_trim_skb(struct sk_buff *skb, int frame_length) dev_kfree_skb_irq(skb); return NULL; } - frame_length = max_t(int, 0, frame_length - RX_HEAD_PADDING - 4); + frame_length = max_t(int, 0, frame_length - ETH_FCS_LEN); if (skb->len > frame_length) { skb->tail -= skb->len - frame_length; skb->len = frame_length; -- 2.17.1