From nobody Fri Nov 29 16:34:32 2024 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0973517A5BC; Wed, 18 Sep 2024 08:19:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.160.252.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726647547; cv=none; b=H5PSkcaq4VVbkee4rsTB9AKxTFNc42SODIGb1AzGXXSdXlzmbLxnV7jMBF3/TcD4w/3sJ0WseBPQMAzoHWIV6OurCa/6298YlQI3LgLkYTVqTuMTkwt4oRfsqD3UQnUaE8NmcZqO/HkCfrkDRVr9VcRcIzYE1NrPSsEHNMn4YAY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726647547; c=relaxed/simple; bh=PXHc9uuEKqK8V0DD82JKE/Uw+92fOHpCejGBJKOAV6o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=kcSehjWROecGj+7ncxUKqNAMFGfU5SymkwRdjT30d5tOPIxT6JktXXJmMvA/WFoFolgNONFKc0wJMUyq8ve5pKPPFyO/MeghZJ3oCEPNE5yR4cXJ2k6NGN7YpLG1prOmqLgyPx+UdIYyZA1YU/Y8x+Tupqp4hVbBCbgV2+IO7O8= 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=210.160.252.172 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="223036307" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 18 Sep 2024 17:19:00 +0900 Received: from GBR-5CG2373LKG.adwin.renesas.com (unknown [10.226.93.61]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 14DBF40062C9; Wed, 18 Sep 2024 17:18:54 +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 1/2] net: ravb: Fix maximum TX frame size for GbEth devices Date: Wed, 18 Sep 2024 09:18:38 +0100 Message-Id: <20240918081839.259-2-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 datasheets for all SoCs using the GbEth IP specify a maximum transmission frame size of 1.5 kByte. I've confirmed through internal discussions that support for 1522 byte frames has been validated, which allows us to support the default MTU of 1500 bytes after reserving space for the Ethernet header, frame checksums and an optional VLAN tag. Fixes: 2e95e08ac009 ("ravb: Add rx_max_buf_size to struct ravb_hw_info") Reviewed-by: Niklas S=C3=B6derlund Reviewed-by: Sergey Shtylyov Signed-off-by: Paul Barker Reviewed-by: Simon Horman --- drivers/net/ethernet/renesas/ravb.h | 1 + drivers/net/ethernet/renesas/ravb_main.c | 6 +++++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/ren= esas/ravb.h index 9893c91af105..a7de5cf6b317 100644 --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -1052,6 +1052,7 @@ struct ravb_hw_info { netdev_features_t net_features; int stats_len; u32 tccr_mask; + u32 tx_max_frame_size; u32 rx_max_frame_size; u32 rx_buffer_size; u32 rx_desc_size; diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/etherne= t/renesas/ravb_main.c index c7ec23688d56..e73cdba58516 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -2674,6 +2674,7 @@ static const struct ravb_hw_info ravb_gen2_hw_info = =3D { .net_features =3D NETIF_F_RXCSUM, .stats_len =3D ARRAY_SIZE(ravb_gstrings_stats), .tccr_mask =3D TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, + .tx_max_frame_size =3D SZ_2K, .rx_max_frame_size =3D SZ_2K, .rx_buffer_size =3D SZ_2K + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)), @@ -2696,6 +2697,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = =3D { .net_features =3D NETIF_F_RXCSUM, .stats_len =3D ARRAY_SIZE(ravb_gstrings_stats), .tccr_mask =3D TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, + .tx_max_frame_size =3D SZ_2K, .rx_max_frame_size =3D SZ_2K, .rx_buffer_size =3D SZ_2K + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)), @@ -2721,6 +2723,7 @@ static const struct ravb_hw_info ravb_gen4_hw_info = =3D { .net_features =3D NETIF_F_RXCSUM, .stats_len =3D ARRAY_SIZE(ravb_gstrings_stats), .tccr_mask =3D TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, + .tx_max_frame_size =3D SZ_2K, .rx_max_frame_size =3D SZ_2K, .rx_buffer_size =3D SZ_2K + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)), @@ -2770,6 +2773,7 @@ static const struct ravb_hw_info gbeth_hw_info =3D { .net_features =3D NETIF_F_RXCSUM | NETIF_F_HW_CSUM, .stats_len =3D ARRAY_SIZE(ravb_gstrings_stats_gbeth), .tccr_mask =3D TCCR_TSRQ0, + .tx_max_frame_size =3D 1522, .rx_max_frame_size =3D SZ_8K, .rx_buffer_size =3D SZ_2K, .rx_desc_size =3D sizeof(struct ravb_rx_desc), @@ -2981,7 +2985,7 @@ static int ravb_probe(struct platform_device *pdev) priv->avb_link_active_low =3D of_property_read_bool(np, "renesas,ether-link-active-low"); =20 - ndev->max_mtu =3D info->rx_max_frame_size - + ndev->max_mtu =3D info->tx_max_frame_size - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN); ndev->min_mtu =3D ETH_MIN_MTU; =20 --=20 2.43.0