From patchwork Thu Nov 12 18:10:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Camelia Alexandra Groza X-Patchwork-Id: 11900959 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 CD084C2D0E4 for ; Thu, 12 Nov 2020 18:10:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 439802222F for ; Thu, 12 Nov 2020 18:10:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726588AbgKLSKd (ORCPT ); Thu, 12 Nov 2020 13:10:33 -0500 Received: from inva020.nxp.com ([92.121.34.13]:40846 "EHLO inva020.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726344AbgKLSK3 (ORCPT ); Thu, 12 Nov 2020 13:10:29 -0500 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id B6CE21A01DD; Thu, 12 Nov 2020 19:10:27 +0100 (CET) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id A88371A0042; Thu, 12 Nov 2020 19:10:27 +0100 (CET) Received: from fsr-ub1464-019.ea.freescale.net (fsr-ub1464-019.ea.freescale.net [10.171.81.207]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 5D5D52032C; Thu, 12 Nov 2020 19:10:27 +0100 (CET) From: Camelia Groza To: kuba@kernel.org, brouer@redhat.com, davem@davemloft.net Cc: madalin.bucur@oss.nxp.com, ioana.ciornei@nxp.com, netdev@vger.kernel.org, Camelia Groza Subject: [PATCH net-next 3/7] dpaa_eth: limit the possible MTU range when XDP is enabled Date: Thu, 12 Nov 2020 20:10:08 +0200 Message-Id: <40168ce44fc9b67db550a128b96c331fd7d9705f.1605181416.git.camelia.groza@nxp.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Implement the ndo_change_mtu callback to prevent users from setting an MTU that would permit processing of S/G frames. The maximum MTU size is dependent on the buffer size. Signed-off-by: Camelia Groza --- drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 32 ++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c index d1d8a46..b9b0db2 100644 --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c @@ -2746,6 +2746,34 @@ static int dpaa_eth_stop(struct net_device *net_dev) return err; } +static bool xdp_validate_mtu(struct dpaa_priv *priv, int mtu) +{ + int max_contig_data = priv->dpaa_bp->size - priv->rx_headroom; + + /* We do not support S/G fragments when XDP is enabled. + * Limit the MTU in relation to the buffer size. + */ + if (mtu + VLAN_ETH_HLEN + ETH_FCS_LEN > max_contig_data) { + dev_warn(priv->net_dev->dev.parent, + "The maximum MTU for XDP is %d\n", + max_contig_data - VLAN_ETH_HLEN - ETH_FCS_LEN); + return false; + } + + return true; +} + +static int dpaa_change_mtu(struct net_device *net_dev, int new_mtu) +{ + struct dpaa_priv *priv = netdev_priv(net_dev); + + if (priv->xdp_prog && !xdp_validate_mtu(priv, new_mtu)) + return -EINVAL; + + net_dev->mtu = new_mtu; + return 0; +} + static int dpaa_setup_xdp(struct net_device *net_dev, struct bpf_prog *prog) { struct dpaa_priv *priv = netdev_priv(net_dev); @@ -2754,8 +2782,7 @@ static int dpaa_setup_xdp(struct net_device *net_dev, struct bpf_prog *prog) int err; /* S/G fragments are not supported in XDP-mode */ - if (prog && (priv->dpaa_bp->raw_size < - net_dev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN)) + if (prog && !xdp_validate_mtu(priv, net_dev->mtu)) return -EINVAL; up = netif_running(net_dev); @@ -2852,6 +2879,7 @@ static int dpaa_ioctl(struct net_device *net_dev, struct ifreq *rq, int cmd) .ndo_set_rx_mode = dpaa_set_rx_mode, .ndo_do_ioctl = dpaa_ioctl, .ndo_setup_tc = dpaa_setup_tc, + .ndo_change_mtu = dpaa_change_mtu, .ndo_bpf = dpaa_xdp, };