From nobody Wed Dec 31 09:23:24 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5AB93C4332F for ; Sun, 5 Nov 2023 20:57:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229730AbjKEU5g (ORCPT ); Sun, 5 Nov 2023 15:57:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36308 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229463AbjKEU5c (ORCPT ); Sun, 5 Nov 2023 15:57:32 -0500 Received: from mail-lf1-x12a.google.com (mail-lf1-x12a.google.com [IPv6:2a00:1450:4864:20::12a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CB02BEB for ; Sun, 5 Nov 2023 12:57:29 -0800 (PST) Received: by mail-lf1-x12a.google.com with SMTP id 2adb3069b0e04-507ad511315so5477153e87.0 for ; Sun, 05 Nov 2023 12:57:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699217848; x=1699822648; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=gQE5Q7bSQ5CYGQU246bebUi4YlUrrbixJJSlZ4tZEQg=; b=eebXLP15HFRHF1NnfTmdlPXcVOVbnmtE9p8dzz+IYmqFzesu1EkR+fVaXcEV5iDmYe OgiebByePomyAo9ga9txe6TlOwSPNlgoXQgeqP5GACCp9bYrQXhPdRX720MlHUkbui68 cTzw/oERVjohWz//20L7BPP9MDgBvSTM3gV3Ekz1BWhnv7F1cqq6nApigEZKm9SFbfX5 35qt0oBJ5n74RnqT8hcRD33giUNU6gZL91oYfaxDcHRUNYftLzJwix+fh+/nb0U64qNJ KQl5Cvfpk/oBhmmquYMwuSX35Y1xqmTlh/7be3SCtg88PVBM0T49LTvZy63IfKlPZSz+ Si6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699217848; x=1699822648; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=gQE5Q7bSQ5CYGQU246bebUi4YlUrrbixJJSlZ4tZEQg=; b=U+vjpuavYR43iyXgHTV23yW2TgfTmWBCezv/j7jzVrLS/4QNNKS1nifp9/mPIaUZFK f/+UFJ24HKN3K4Jc0vjt7lE/TlkH5OeBQuWj5kfFZfJtVAzFae5Stk+coVXDt+mLEtR5 rWwMbrD4y3qpAqfOTjG82VYVEShmUXR5nM2ugdiGUWHWPYm73aGrFfu34MuSXpALJEt7 OgubK2X+VdvOHRvk60DI3g2UHfbZwSMoYdaQLJ7P2MjMZBuG1REfmYmNOpkl8n3U9Xyd vsJZ42XoFdfjw+QVZUlxJ+Y+VEpw3CCv/7PpU1lkF6rIXXuFGS6SKitDQ9+/0zy43ANA 6vtA== X-Gm-Message-State: AOJu0YxC6H1ZVcIZlp7F7FvzfM5Ml0RAbTlkSmGuiidL2GhIf0uZBt2o EgA6bmEDeo75hOo1twwxBOlWNuxgcQxhVkez+RI= X-Google-Smtp-Source: AGHT+IHOmoeKz7m5iyemJOxxs0vWx/4QhLzQOa5mtwwvMfSXkeaGjljiQd5YYPz0Pgyz9fiVyiPrlQ== X-Received: by 2002:ac2:4d07:0:b0:502:ff3b:766f with SMTP id r7-20020ac24d07000000b00502ff3b766fmr18019859lfi.6.1699217847698; Sun, 05 Nov 2023 12:57:27 -0800 (PST) Received: from [127.0.1.1] ([85.235.12.238]) by smtp.gmail.com with ESMTPSA id d12-20020ac24c8c000000b00507c72697d0sm931873lfl.303.2023.11.05.12.57.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Nov 2023 12:57:27 -0800 (PST) From: Linus Walleij Date: Sun, 05 Nov 2023 21:57:23 +0100 Subject: [PATCH net v2 1/4] net: ethernet: cortina: Fix MTU max setting MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231105-gemini-largeframe-fix-v2-1-cd3a5aa6c496@linaro.org> References: <20231105-gemini-largeframe-fix-v2-0-cd3a5aa6c496@linaro.org> In-Reply-To: <20231105-gemini-largeframe-fix-v2-0-cd3a5aa6c496@linaro.org> To: Hans Ulli Kroll , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , =?utf-8?q?Micha=C5=82_Miros=C5=82aw?= , Vladimir Oltean , Andrew Lunn Cc: linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Linus Walleij X-Mailer: b4 0.12.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The RX max frame size is over 10000 for the Gemini ethernet, but the TX max frame size is actually just 2047 (0x7ff after checking the datasheet). Reflect this in what we offer to Linux, cap the MTU at the TX max frame minus ethernet headers. Use the BIT() macro for related bit flags so these TX settings are consistent. Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethern= et") Signed-off-by: Linus Walleij Reviewed-by: Andrew Lunn --- drivers/net/ethernet/cortina/gemini.c | 7 ++++--- drivers/net/ethernet/cortina/gemini.h | 2 +- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/c= ortina/gemini.c index 5423fe26b4ef..ed9701f8ad9a 100644 --- a/drivers/net/ethernet/cortina/gemini.c +++ b/drivers/net/ethernet/cortina/gemini.c @@ -2464,11 +2464,12 @@ static int gemini_ethernet_port_probe(struct platfo= rm_device *pdev) =20 netdev->hw_features =3D GMAC_OFFLOAD_FEATURES; netdev->features |=3D GMAC_OFFLOAD_FEATURES | NETIF_F_GRO; - /* We can handle jumbo frames up to 10236 bytes so, let's accept - * payloads of 10236 bytes minus VLAN and ethernet header + /* We can receive jumbo frames up to 10236 bytes but only + * transmit 2047 bytes so, let's accept payloads of 2047 + * bytes minus VLAN and ethernet header */ netdev->min_mtu =3D ETH_MIN_MTU; - netdev->max_mtu =3D 10236 - VLAN_ETH_HLEN; + netdev->max_mtu =3D MTU_SIZE_BIT_MASK - VLAN_ETH_HLEN; =20 port->freeq_refill =3D 0; netif_napi_add(netdev, &port->napi, gmac_napi_poll); diff --git a/drivers/net/ethernet/cortina/gemini.h b/drivers/net/ethernet/c= ortina/gemini.h index 9fdf77d5eb37..201b4efe2937 100644 --- a/drivers/net/ethernet/cortina/gemini.h +++ b/drivers/net/ethernet/cortina/gemini.h @@ -502,7 +502,7 @@ union gmac_txdesc_3 { #define SOF_BIT 0x80000000 #define EOF_BIT 0x40000000 #define EOFIE_BIT BIT(29) -#define MTU_SIZE_BIT_MASK 0x1fff +#define MTU_SIZE_BIT_MASK 0x7ff /* Max MTU 2047 bytes */ =20 /* GMAC Tx Descriptor */ struct gmac_txdesc { --=20 2.34.1 From nobody Wed Dec 31 09:23:24 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0ACCCC4167D for ; Sun, 5 Nov 2023 20:57:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229781AbjKEU5j (ORCPT ); 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Sun, 05 Nov 2023 12:57:28 -0800 (PST) From: Linus Walleij Date: Sun, 05 Nov 2023 21:57:24 +0100 Subject: [PATCH net v2 2/4] net: ethernet: cortina: Fix max RX frame define MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231105-gemini-largeframe-fix-v2-2-cd3a5aa6c496@linaro.org> References: <20231105-gemini-largeframe-fix-v2-0-cd3a5aa6c496@linaro.org> In-Reply-To: <20231105-gemini-largeframe-fix-v2-0-cd3a5aa6c496@linaro.org> To: Hans Ulli Kroll , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , =?utf-8?q?Micha=C5=82_Miros=C5=82aw?= , Vladimir Oltean , Andrew Lunn Cc: linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Linus Walleij X-Mailer: b4 0.12.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Enumerator 3 is 1548 bytes according to the datasheet. Not 1542. Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethern= et") Reviewed-by: Andrew Lunn Signed-off-by: Linus Walleij --- drivers/net/ethernet/cortina/gemini.c | 4 ++-- drivers/net/ethernet/cortina/gemini.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/c= ortina/gemini.c index ed9701f8ad9a..b21a94b4ab5c 100644 --- a/drivers/net/ethernet/cortina/gemini.c +++ b/drivers/net/ethernet/cortina/gemini.c @@ -432,8 +432,8 @@ static const struct gmac_max_framelen gmac_maxlens[] = =3D { .val =3D CONFIG0_MAXLEN_1536, }, { - .max_l3_len =3D 1542, - .val =3D CONFIG0_MAXLEN_1542, + .max_l3_len =3D 1548, + .val =3D CONFIG0_MAXLEN_1548, }, { .max_l3_len =3D 9212, diff --git a/drivers/net/ethernet/cortina/gemini.h b/drivers/net/ethernet/c= ortina/gemini.h index 201b4efe2937..24bb989981f2 100644 --- a/drivers/net/ethernet/cortina/gemini.h +++ b/drivers/net/ethernet/cortina/gemini.h @@ -787,7 +787,7 @@ union gmac_config0 { #define CONFIG0_MAXLEN_1536 0 #define CONFIG0_MAXLEN_1518 1 #define CONFIG0_MAXLEN_1522 2 -#define CONFIG0_MAXLEN_1542 3 +#define CONFIG0_MAXLEN_1548 3 #define CONFIG0_MAXLEN_9k 4 /* 9212 */ #define CONFIG0_MAXLEN_10k 5 /* 10236 */ #define CONFIG0_MAXLEN_1518__6 6 --=20 2.34.1 From nobody Wed Dec 31 09:23:24 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7271C41535 for ; Sun, 5 Nov 2023 20:57:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229791AbjKEU5m (ORCPT ); Sun, 5 Nov 2023 15:57:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229655AbjKEU5f (ORCPT ); Sun, 5 Nov 2023 15:57:35 -0500 Received: from mail-lj1-x22e.google.com (mail-lj1-x22e.google.com [IPv6:2a00:1450:4864:20::22e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D268F2 for ; Sun, 5 Nov 2023 12:57:32 -0800 (PST) Received: by mail-lj1-x22e.google.com with SMTP id 38308e7fff4ca-2c514cbbe7eso54279311fa.1 for ; Sun, 05 Nov 2023 12:57:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699217850; x=1699822650; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=hHGg7IgOG8aP3eorgAYgy9MJBjBd5UgvuR9R9eWvihw=; b=u8Wy9jANe9JmWn3rXVAJj1iNV1dQIxXllohcGldOr4GrLo2+dAwpct5BXSIncZGY/V IynXdgJUzzzrO6bQQ/QBdlwqCjGYq4JuQ7IMEHNfQOIfthAw9fOjYgqi3u9/j0y8Nkmu Zerox7yAGlML/hU/LfOzJ0DxroanMhajcMYIUqHDJEP7ksfV3FaYXjMVCTgaU4KEjJbT PPx3a1ceGdTx9ei7i8YcUT61pxDiWXcM3X8l5t8I6QHnMdyxS82iT7nwfMD6pHhQKnsZ 9gCXzh5QWjOcbvhR/Ma/YmRtbGeHrJ8akaujvYhe0E2oJUO3OTejjOLiNR0senP2x+IV ZUrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699217850; x=1699822650; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=hHGg7IgOG8aP3eorgAYgy9MJBjBd5UgvuR9R9eWvihw=; b=Ezixc6WFM2FuR+NEcIeZCj2dzV6oMP9F7y9Zhyt9ayzhpnNMgwsz9MiihJimRhdA/5 RopiLpcqinjMh1Z34Kp3h4sTRBJ3ABymISVqDB2rAkvU6mLDvryl2mDBTiDxXPv5BAA4 yoZMzSBBPrp/vE48MCiY3P7nYfY93wl6HNPhzcBWulNshCfAqQUVYDMgmW+Hx4URp8rQ wMuiaoQaOKoFUqC/9J88NS0Xt4WItH13sF5/hKKkLXaKlgHkfmh4+qM5gcxL80GHZ1zM +jzOkFsNYfbrqvX0hDaLtM+R7lm37HOX9D6stOuAfasHE0C9qqDou02Ov5s+cdaREIOI ANKA== X-Gm-Message-State: AOJu0Yyd+SKImRMfFZRUg9XaPpXVSo53v9DwoV+xwfFtLEI8VbNYBgxB S4pSbjqtCuFa1syJ0hJ8I1VLAA== X-Google-Smtp-Source: AGHT+IF7W3TbvSvzphWkJ38I4V5LXCkTCcll16Xd2nGcrFIOQF+dFaXj5XAglJ+flcNEhVosFX81xQ== X-Received: by 2002:a05:6512:368f:b0:506:8d2a:5654 with SMTP id d15-20020a056512368f00b005068d2a5654mr17718911lfs.28.1699217850484; Sun, 05 Nov 2023 12:57:30 -0800 (PST) Received: from [127.0.1.1] ([85.235.12.238]) by smtp.gmail.com with ESMTPSA id d12-20020ac24c8c000000b00507c72697d0sm931873lfl.303.2023.11.05.12.57.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Nov 2023 12:57:30 -0800 (PST) From: Linus Walleij Date: Sun, 05 Nov 2023 21:57:25 +0100 Subject: [PATCH net v2 3/4] net: ethernet: cortina: Protect against oversized frames MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231105-gemini-largeframe-fix-v2-3-cd3a5aa6c496@linaro.org> References: <20231105-gemini-largeframe-fix-v2-0-cd3a5aa6c496@linaro.org> In-Reply-To: <20231105-gemini-largeframe-fix-v2-0-cd3a5aa6c496@linaro.org> To: Hans Ulli Kroll , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , =?utf-8?q?Micha=C5=82_Miros=C5=82aw?= , Vladimir Oltean , Andrew Lunn Cc: linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Linus Walleij X-Mailer: b4 0.12.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The max size of a transfer no matter the MTU is 64KB-1 so immediately bail out if the skb exceeds that. The calling site tries to linearize the skbuff on error so return a special error code -E2BIG to indicate that this will not work in any way and bail out immediately if this happens. Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethern= et") Signed-off-by: Linus Walleij --- drivers/net/ethernet/cortina/gemini.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/c= ortina/gemini.c index b21a94b4ab5c..576174a862a9 100644 --- a/drivers/net/ethernet/cortina/gemini.c +++ b/drivers/net/ethernet/cortina/gemini.c @@ -1151,6 +1151,12 @@ static int gmac_map_tx_bufs(struct net_device *netde= v, struct sk_buff *skb, if (skb->protocol =3D=3D htons(ETH_P_8021Q)) mtu +=3D VLAN_HLEN; =20 + if (skb->len > 65535) { + /* The field for length is only 16 bits */ + netdev_err(netdev, "%s: frame too big, max size 65535 bytes\n", __func__= ); + return -E2BIG; + } + word1 =3D skb->len; word3 =3D SOF_BIT; =20 @@ -1232,6 +1238,7 @@ static netdev_tx_t gmac_start_xmit(struct sk_buff *sk= b, struct gmac_txq *txq; int txq_num, nfrags; union dma_rwptr rw; + int ret; =20 if (skb->len >=3D 0x10000) goto out_drop_free; @@ -1269,7 +1276,11 @@ static netdev_tx_t gmac_start_xmit(struct sk_buff *s= kb, } } =20 - if (gmac_map_tx_bufs(netdev, skb, txq, &w)) { + ret =3D gmac_map_tx_bufs(netdev, skb, txq, &w); + if (ret =3D=3D -E2BIG) + goto out_drop; + if (ret) { + /* Linearize and retry */ if (skb_linearize(skb)) goto out_drop; =20 --=20 2.34.1 From nobody Wed Dec 31 09:23:24 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6C2EC4167B for ; Sun, 5 Nov 2023 20:57:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229912AbjKEU5o (ORCPT ); Sun, 5 Nov 2023 15:57:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229690AbjKEU5g (ORCPT ); Sun, 5 Nov 2023 15:57:36 -0500 Received: from mail-lj1-x231.google.com (mail-lj1-x231.google.com [IPv6:2a00:1450:4864:20::231]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2ADEBE1 for ; Sun, 5 Nov 2023 12:57:33 -0800 (PST) Received: by mail-lj1-x231.google.com with SMTP id 38308e7fff4ca-2c5071165d5so51621591fa.0 for ; Sun, 05 Nov 2023 12:57:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699217851; x=1699822651; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=SkmUkmLoK96BNboao7deauYFXBoeWm6vYd1S1QHVdg4=; b=NVrow5zPhOARUcJ620qmCGf0cuZ2picFuADI/ObES/Oco0TYqjoz1pQJyywbgPD1C5 hWPzKNDAjAQoBAnTXQB9f3b2XIjSWOFdHemaGM8KUdgl/gsYa9p6tP8ZUoXDaNuTN7Pm vNYT3QpLD32izsPve5f6HGIcG3ku8VcUpYMy2QtAKBTuTqqcmBBA1K/84x2xZXlfJLG8 g5kZO/yf7dCep1JDglfPTx3qW90oaIkGqxb5whXumg/QOHu3/63p9mYGIpkqquy3niW5 yXPknZ60LFWXrqcHMlLoFovxG9N0fV+Ru1UAyx4eIlZQh4jxPyjPdqBX/F5Y3SBwlw4h Z+pQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699217851; x=1699822651; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=SkmUkmLoK96BNboao7deauYFXBoeWm6vYd1S1QHVdg4=; b=vObtsb4s/4OVja7J8hQtiIfzvFFxXBU5VOukmdg5+SgQdvklGUiYtTXviaQK7WacGS hhIDChwuILZCG4t04K3DkYl8D1dSgAFBFn2G32EozP9xQFZRDwMsZv8xeEX6c4E+nFfj EiY4Wxo38zWkdmMACPgeKC5uLi5Amb9JoCPCpVGZhAnCTt6DZDelh5xdcM3HdsPt3+T4 90FF02RWJRZykO/RmO1FZoHl4hPuyrMKPR3e7Ym5pVlLNuVlkJIinfxhuTpF8vcMNuK4 +TqdEvckpcKPys7HJvWegMw8YPb7epyFw24F93OFaifxrpcdSx17cRRnxQd6InLfUNKp 9T6g== X-Gm-Message-State: AOJu0YxI+Txtgh14j70n/iVdaC9aLyKONF9Q7MCS49j9VCG4tvHU/M3I a7TkwBBR8dxepN7vtfmBva7gkQ== X-Google-Smtp-Source: AGHT+IEZ5yfK1828ZFfg1z0JEcil3ZmjTYmj62YIDKrrJea9QiYH64N281WrNe7UIF3CYVdtagRcqg== X-Received: by 2002:ac2:522c:0:b0:507:9dfd:f846 with SMTP id i12-20020ac2522c000000b005079dfdf846mr19156590lfl.69.1699217851479; Sun, 05 Nov 2023 12:57:31 -0800 (PST) Received: from [127.0.1.1] ([85.235.12.238]) by smtp.gmail.com with ESMTPSA id d12-20020ac24c8c000000b00507c72697d0sm931873lfl.303.2023.11.05.12.57.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Nov 2023 12:57:31 -0800 (PST) From: Linus Walleij Date: Sun, 05 Nov 2023 21:57:26 +0100 Subject: [PATCH net v2 4/4] net: ethernet: cortina: Handle large frames MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231105-gemini-largeframe-fix-v2-4-cd3a5aa6c496@linaro.org> References: <20231105-gemini-largeframe-fix-v2-0-cd3a5aa6c496@linaro.org> In-Reply-To: <20231105-gemini-largeframe-fix-v2-0-cd3a5aa6c496@linaro.org> To: Hans Ulli Kroll , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , =?utf-8?q?Micha=C5=82_Miros=C5=82aw?= , Vladimir Oltean , Andrew Lunn Cc: linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Linus Walleij X-Mailer: b4 0.12.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The Gemini ethernet controller provides hardware checksumming for frames up to 1514 bytes including ethernet headers but not FCS. If we start sending bigger frames (after first bumping up the MTU on both interfaces sending and receiveing the frames), truncated packets start to appear on the target such as in this tcpdump resulting from ping -s 1474: 23:34:17.241983 14:d6:4d:a8:3c:4f (oui Unknown) > bc:ae:c5:6b:a8:3d (oui Un= known), ethertype IPv4 (0x0800), length 1514: truncated-ip - 2 bytes missing! (tos 0x0, ttl 64, id 32653, offset 0, flags [DF], proto ICMP (1), length 15= 02) OpenWrt.lan > Fecusia: ICMP echo request, id 1672, seq 50, length 1482 If we bypass the hardware checksumming and provide a software fallback, everything starts working fine up to the max TX MTU of 2047 bytes, for example ping -s2000 192.168.1.2: 00:44:29.587598 bc:ae:c5:6b:a8:3d (oui Unknown) > 14:d6:4d:a8:3c:4f (oui Un= known), ethertype IPv4 (0x0800), length 2042: (tos 0x0, ttl 64, id 51828, offset 0, flags [none], proto ICMP (1), length = 2028) Fecusia > OpenWrt.lan: ICMP echo reply, id 1683, seq 4, length 2008 The bit enabling to bypass hardware checksum (or any of the "TSS" bits) are undocumented in the hardware reference manual. The entire hardware checksum unit appears undocumented. The conclusion that we need to use the "bypass" bit was found by trial-and-error. Since no hardware checksum will happen, we slot in a software checksum fallback. Check for the condition where we need to compute checksum on the skb with either hardware or software using =3D=3D CHECKSUM_PARTIAL instead of !=3D CHECKSUM_NONE which is an incomplete check according to . On the D-Link DIR-685 router this fixes a bug on the conduit interface to the RTL8366RB DSA switch: as the switch needs to add space for its tag it increases the MTU on the conduit interface to 1504 and that means that when the router sends packages of 1500 bytes these get an extra 4 bytes of DSA tag and the transfer fails because of the erroneous hardware checksumming, affecting such basic functionality as the LuCI web interface. Suggested-by: Vladimir Oltean Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethern= et") Signed-off-by: Linus Walleij --- drivers/net/ethernet/cortina/gemini.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/c= ortina/gemini.c index 576174a862a9..84295c1b87e6 100644 --- a/drivers/net/ethernet/cortina/gemini.c +++ b/drivers/net/ethernet/cortina/gemini.c @@ -1145,6 +1145,7 @@ static int gmac_map_tx_bufs(struct net_device *netdev= , struct sk_buff *skb, dma_addr_t mapping; unsigned short mtu; void *buffer; + int ret; =20 mtu =3D ETH_HLEN; mtu +=3D netdev->mtu; @@ -1165,7 +1166,19 @@ static int gmac_map_tx_bufs(struct net_device *netde= v, struct sk_buff *skb, word3 |=3D mtu; } =20 - if (skb->ip_summed !=3D CHECKSUM_NONE) { + if (skb->len >=3D ETH_FRAME_LEN) { + /* Hardware offloaded checksumming isn't working on frames + * bigger than 1514 bytes. Perhaps the buffer is only 1518 + * bytes fitting a normal frame and a checksum? + * Just use software checksumming and bypass on bigger frames. + */ + if (skb->ip_summed =3D=3D CHECKSUM_PARTIAL) { + ret =3D skb_checksum_help(skb); + if (ret) + return ret; + } + word1 |=3D TSS_BYPASS_BIT; + } else if (skb->ip_summed =3D=3D CHECKSUM_PARTIAL) { int tcp =3D 0; =20 if (skb->protocol =3D=3D htons(ETH_P_IP)) { --=20 2.34.1