From patchwork Sat Jun 15 10:30:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paul Barker X-Patchwork-Id: 13699270 X-Patchwork-Delegate: kuba@kernel.org Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 42F9C38DDB; Sat, 15 Jun 2024 10:30:54 +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=1718447457; cv=none; b=UyCvRGddQ8DLLxv2zpAMf59lmHbY0L7lqIgg5SknP6hSAohnE1q+VEEMaD+8JE2NprZ8hTS2/rNlhbP0aXsqoUnx90ABZSQcpOI5PuJA8zCBPMSdY90jnuoWIf4CJQr8OqzFpkE94lunS/A4QMQku/XmdZaoTBjfL7tGVvuGPt0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718447457; c=relaxed/simple; bh=DiMKpHDWyatyehE4Sc48yNSznIy8WZ+otkL59Gy7c9M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=frvcQImEMgimnkXxHnbCJuUfHwWaTU6zw7Lk//66v8gWdHfQd092JmjtgStcATGekhlJSr8gOv/rzjbcwOQZKnu6QQOhcf800ec7f1kaIwAh4MeR4SAghDLw68G86lj6ILdh+TNqnVgM4iIgqjXwjKan10/XRGEJhZNged7OlnY= 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="6.08,240,1712588400"; d="scan'208";a="208029883" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 15 Jun 2024 19:30:54 +0900 Received: from renesas-deb12.mshome.net (unknown [10.226.92.58]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 4958940071E2; Sat, 15 Jun 2024 19:30:49 +0900 (JST) From: Paul Barker To: Sergey Shtylyov , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , =?utf-8?q?Niklas_S=C3=B6derlund?= Cc: Paul Barker , Biju Das , Claudiu Beznea , Lad Prabhakar , Mitsuhiro Kimura , netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [net-next PATCH 1/2] net: ravb: Fix maximum MTU for GbEth devices Date: Sat, 15 Jun 2024 11:30:37 +0100 Message-Id: <20240615103038.973-2-paul.barker.ct@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240615103038.973-1-paul.barker.ct@bp.renesas.com> References: <20240615103038.973-1-paul.barker.ct@bp.renesas.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org 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") Signed-off-by: Paul Barker Reviewed-by: Niklas Söderlund Reviewed-by: Sergey Shtylyov --- 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/renesas/ravb.h index 6b2444d31fcc..e592e89b0d96 100644 --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -1051,6 +1051,7 @@ 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/ethernet/renesas/ravb_main.c index c1546b916e4e..02cbf850bd85 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -2664,6 +2664,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = { .net_features = NETIF_F_RXCSUM, .stats_len = ARRAY_SIZE(ravb_gstrings_stats), .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, + .tx_max_frame_size = SZ_2K, .rx_max_frame_size = SZ_2K, .rx_buffer_size = SZ_2K + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)), @@ -2689,6 +2690,7 @@ static const struct ravb_hw_info ravb_gen2_hw_info = { .net_features = NETIF_F_RXCSUM, .stats_len = ARRAY_SIZE(ravb_gstrings_stats), .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, + .tx_max_frame_size = SZ_2K, .rx_max_frame_size = SZ_2K, .rx_buffer_size = SZ_2K + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)), @@ -2711,6 +2713,7 @@ static const struct ravb_hw_info ravb_rzv2m_hw_info = { .net_features = NETIF_F_RXCSUM, .stats_len = ARRAY_SIZE(ravb_gstrings_stats), .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, + .tx_max_frame_size = SZ_2K, .rx_max_frame_size = SZ_2K, .rx_buffer_size = SZ_2K + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)), @@ -2735,6 +2738,7 @@ static const struct ravb_hw_info gbeth_hw_info = { .net_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM, .stats_len = ARRAY_SIZE(ravb_gstrings_stats_gbeth), .tccr_mask = TCCR_TSRQ0, + .tx_max_frame_size = 1522, .rx_max_frame_size = SZ_8K, .rx_buffer_size = SZ_2K, .rx_desc_size = sizeof(struct ravb_rx_desc), @@ -2946,7 +2950,7 @@ static int ravb_probe(struct platform_device *pdev) priv->avb_link_active_low = of_property_read_bool(np, "renesas,ether-link-active-low"); - ndev->max_mtu = info->rx_max_frame_size - + ndev->max_mtu = info->tx_max_frame_size - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN); ndev->min_mtu = ETH_MIN_MTU;