From nobody Fri Nov 29 16:34:25 2024 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 04D6E188A11; Wed, 18 Sep 2024 08:19:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.160.252.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726647548; cv=none; b=dbDlbtKKxAolFwCDit1bABQDxtDmfrzgFDPtdElayRK2kBpPL4N6/if2H1g6LNOOzQc6h9eiVNH3CRRpMo1ce387TSogI1uAyvbOg8ctmrU+PYjOoGVLMCzMSiLuwWrS3v7tyGRg7HEbZnj/5h94bbm0fMvUJTYBuG98f4fg56o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726647548; c=relaxed/simple; bh=sCzmNmE1dkbBgPAe9riNuYDBqENaSpmejami5k78wi4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=PoqOTC2Dz6/uWQAfnVS+YRT/7gdLRlcrdOpuGpyUL306YH0B+OOvh8NdnoQVW3nsDJG4gpoFTHb9sIwqbXUoI5uI4m6fwF/9b1vM6nFt2/Lj7AGiNXzSEMjXggU77GoGkPC734NaRV0wgivqrTVTNZQRQjCK/7RvjrzApAXdFmo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=bp.renesas.com; spf=pass smtp.mailfrom=bp.renesas.com; arc=none smtp.client-ip=210.160.252.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=bp.renesas.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bp.renesas.com X-IronPort-AV: E=Sophos;i="6.10,238,1719846000"; d="scan'208";a="219067088" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 18 Sep 2024 17:19:05 +0900 Received: from GBR-5CG2373LKG.adwin.renesas.com (unknown [10.226.93.61]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 9E6B940062C9; Wed, 18 Sep 2024 17:19:00 +0900 (JST) From: Paul Barker To: Sergey Shtylyov , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , =?UTF-8?q?Niklas=20S=C3=B6derlund?= , Andrew Lunn Cc: Paul Barker , Biju Das , Claudiu Beznea , Lad Prabhakar , Mitsuhiro Kimura , Geert Uytterhoeven , netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [net PATCH v3 2/2] net: ravb: Fix R-Car RX frame size limit Date: Wed, 18 Sep 2024 09:18:39 +0100 Message-Id: <20240918081839.259-3-paul.barker.ct@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240918081839.259-1-paul.barker.ct@bp.renesas.com> References: <20240918081839.259-1-paul.barker.ct@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The RX frame size limit should not be based on the current MTU setting. Instead it should be based on the hardware capabilities. While we're here, improve the description of the receive frame length setting as suggested by Niklas. Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Reviewed-by: Sergey Shtylyov Reviewed-by: Niklas S=C3=B6derlund Signed-off-by: Paul Barker Reviewed-by: Simon Horman --- drivers/net/ethernet/renesas/ravb_main.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/etherne= t/renesas/ravb_main.c index e73cdba58516..d2a6518532f3 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -555,8 +555,16 @@ static void ravb_emac_init_gbeth(struct net_device *nd= ev) =20 static void ravb_emac_init_rcar(struct net_device *ndev) { - /* Receive frame limit set register */ - ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR); + struct ravb_private *priv =3D netdev_priv(ndev); + + /* Set receive frame length + * + * The length set here describes the frame from the destination address + * up to and including the CRC data. However only the frame data, + * excluding the CRC, are transferred to memory. To allow for the + * largest frames add the CRC length to the maximum Rx descriptor size. + */ + ravb_write(ndev, priv->info->rx_max_frame_size + ETH_FCS_LEN, RFLR); =20 /* EMAC Mode: PAUSE prohibition; Duplex; RX Checksum; TX; RX */ ravb_write(ndev, ECMR_ZPF | ECMR_DM | --=20 2.43.0