From patchwork Thu Sep 23 14:08:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 12513023 X-Patchwork-Delegate: kuba@kernel.org 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 EB0D6C433F5 for ; Thu, 23 Sep 2021 14:09:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D404B610C8 for ; Thu, 23 Sep 2021 14:09:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241674AbhIWOKd (ORCPT ); Thu, 23 Sep 2021 10:10:33 -0400 Received: from relmlor2.renesas.com ([210.160.252.172]:46334 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S241642AbhIWOK2 (ORCPT ); Thu, 23 Sep 2021 10:10:28 -0400 X-IronPort-AV: E=Sophos;i="5.85,316,1624287600"; d="scan'208";a="94936100" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 23 Sep 2021 23:08:56 +0900 Received: from localhost.localdomain (unknown [10.226.92.2]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id C6F87437E764; Thu, 23 Sep 2021 23:08:53 +0900 (JST) From: Biju Das To: "David S. Miller" , Jakub Kicinski Cc: Biju Das , Sergey Shtylyov , Lad Prabhakar , Andrew Lunn , Sergei Shtylyov , Geert Uytterhoeven , Adam Ford , Yoshihiro Shimoda , netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Chris Paterson , Biju Das Subject: [RFC/PATCH 11/18] ravb: Add rx_2k_buffers to struct ravb_hw_info Date: Thu, 23 Sep 2021 15:08:06 +0100 Message-Id: <20210923140813.13541-12-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210923140813.13541-1-biju.das.jz@bp.renesas.com> References: <20210923140813.13541-1-biju.das.jz@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC R-Car AVB-DMAC has Maximum 2K size on RZ buffer. We need to Allow for changing the MTU within the limit of the maximum size of a descriptor (2048 bytes). Add a rx_2k_buffers hw feature bit to struct ravb_hw_info to add this constraint only for R-Car. Signed-off-by: Biju Das --- drivers/net/ethernet/renesas/ravb.h | 1 + drivers/net/ethernet/renesas/ravb_main.c | 8 ++++++-- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h index 7532cb51d7b8..ab4909244276 100644 --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -1033,6 +1033,7 @@ struct ravb_hw_info { unsigned magic_pkt:1; /* E-MAC supports magic packet detection */ unsigned mii_rgmii_selection:1; /* E-MAC supports mii/rgmii selection */ unsigned half_duplex:1; /* E-MAC supports half duplex mode */ + unsigned rx_2k_buffers:1; /* AVB-DMAC has Max 2K buf size on RX */ }; struct ravb_private { diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 7f06adbd00e1..9c0d35f4b221 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -2164,6 +2164,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = { .ccc_gac = 1, .multi_tsrq = 1, .magic_pkt = 1, + .rx_2k_buffers = 1, }; static const struct ravb_hw_info ravb_gen2_hw_info = { @@ -2184,6 +2185,7 @@ static const struct ravb_hw_info ravb_gen2_hw_info = { .aligned_tx = 1, .multi_tsrq = 1, .magic_pkt = 1, + .rx_2k_buffers = 1, }; static const struct ravb_hw_info rgeth_hw_info = { @@ -2417,8 +2419,10 @@ static int ravb_probe(struct platform_device *pdev) } clk_prepare_enable(priv->refclk); - ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN); - ndev->min_mtu = ETH_MIN_MTU; + if (info->rx_2k_buffers) { + ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN); + ndev->min_mtu = ETH_MIN_MTU; + } /* FIXME: R-Car Gen2 has 4byte alignment restriction for tx buffer * Use two descriptor to handle such situation. First descriptor to