From patchwork Fri Jun 11 13:27:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Grygorii Strashko X-Patchwork-Id: 458944 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=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 41FE3C48BD1 for ; Fri, 11 Jun 2021 13:27:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D1FF613EE for ; Fri, 11 Jun 2021 13:27:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230017AbhFKN3r (ORCPT ); Fri, 11 Jun 2021 09:29:47 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:37720 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229484AbhFKN3p (ORCPT ); Fri, 11 Jun 2021 09:29:45 -0400 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 15BDRhsj053019; Fri, 11 Jun 2021 08:27:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1623418063; bh=kCNd5UQ6OfFdSiYnFuwzAogCcAMzU3mcN6YcXGRBPyE=; h=From:To:CC:Subject:Date; b=uPfMM3BV83X7p9MeFtMHqSyVbyAMDm3SLK8BSqvosr2RJobHfFPSs6UQF80QqxVxt OMAnXBa7ti3VVa9k+uCh/lYijJvol9/a04qY824vNXUYEVhiZHG3m58q3jqLza1glO B+psAtWdujhrh1Ic59RPU2yq++CcyWQd0iklbAHQ= Received: from DLEE101.ent.ti.com (dlee101.ent.ti.com [157.170.170.31]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 15BDRgYw023175 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 11 Jun 2021 08:27:43 -0500 Received: from DLEE103.ent.ti.com (157.170.170.33) by DLEE101.ent.ti.com (157.170.170.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Fri, 11 Jun 2021 08:27:42 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE103.ent.ti.com (157.170.170.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Fri, 11 Jun 2021 08:27:42 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 15BDRf3h116489; Fri, 11 Jun 2021 08:27:41 -0500 From: Grygorii Strashko To: "David S. Miller" , , Jakub Kicinski , Ben Hutchings CC: , Vignesh Raghavendra , , Lokesh Vutla , Subject: [PATCH net] net: ethernet: ti: cpsw: fix min eth packet size for non-switch use-cases Date: Fri, 11 Jun 2021 16:27:32 +0300 Message-ID: <20210611132732.10690-1-grygorii.strashko@ti.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The CPSW switchdev driver inherited fix from commit 9421c9015047 ("net: ethernet: ti: cpsw: fix min eth packet size") which changes min TX packet size to 64bytes (VLAN_ETH_ZLEN, excluding ETH_FCS). It was done to fix HW packed drop issue when packets are sent from Host to the port with PVID and un-tagging enabled. Unfortunately this breaks some other non-switch specific use-cases, like: - [1] CPSW port as DSA CPU port with DSA-tag applied at the end of the packet - [2] Some industrial protocols, which expects min TX packet size 60Bytes (excluding FCS). Fix it by configuring min TX packet size depending driver mode - 60Bytes (ETH_ZLEN) for multi mac (dual-mac) mode - 64Bytes (VLAN_ETH_ZLEN) for switch mode [1] https://lore.kernel.org/netdev/20210531124051.GA15218@cephalopod/ [2] https://e2e.ti.com/support/arm/sitara_arm/f/791/t/701669 Cc: Ben Hutchings Cc: stable@vger.kernel.org Fixes: ed3525eda4c4 ("net: ethernet: ti: introduce cpsw switchdev based driver part 1 - dual-emac") Signed-off-by: Grygorii Strashko --- drivers/net/ethernet/ti/cpsw_new.c | 12 +++++++++--- drivers/net/ethernet/ti/cpsw_priv.h | 4 +++- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c index 11f536138495..401909bff319 100644 --- a/drivers/net/ethernet/ti/cpsw_new.c +++ b/drivers/net/ethernet/ti/cpsw_new.c @@ -918,14 +918,17 @@ static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb, struct cpts *cpts = cpsw->cpts; struct netdev_queue *txq; struct cpdma_chan *txch; + unsigned int len; int ret, q_idx; - if (skb_padto(skb, CPSW_MIN_PACKET_SIZE)) { + if (skb_padto(skb, priv->tx_packet_min)) { cpsw_err(priv, tx_err, "packet pad failed\n"); ndev->stats.tx_dropped++; return NET_XMIT_DROP; } + len = skb->len < priv->tx_packet_min ? priv->tx_packet_min : skb->len; + if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP && priv->tx_ts_enabled && cpts_can_timestamp(cpts, skb)) skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; @@ -937,7 +940,7 @@ static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb, txch = cpsw->txv[q_idx].ch; txq = netdev_get_tx_queue(ndev, q_idx); skb_tx_timestamp(skb); - ret = cpdma_chan_submit(txch, skb, skb->data, skb->len, + ret = cpdma_chan_submit(txch, skb, skb->data, len, priv->emac_port); if (unlikely(ret != 0)) { cpsw_err(priv, tx_err, "desc submit failed\n"); @@ -1100,7 +1103,7 @@ static int cpsw_ndo_xdp_xmit(struct net_device *ndev, int n, for (i = 0; i < n; i++) { xdpf = frames[i]; - if (xdpf->len < CPSW_MIN_PACKET_SIZE) + if (xdpf->len < priv->tx_packet_min) break; if (cpsw_xdp_tx_frame(priv, xdpf, NULL, priv->emac_port)) @@ -1389,6 +1392,7 @@ static int cpsw_create_ports(struct cpsw_common *cpsw) priv->dev = dev; priv->msg_enable = netif_msg_init(debug_level, CPSW_DEBUG); priv->emac_port = i + 1; + priv->tx_packet_min = CPSW_MIN_PACKET_SIZE; if (is_valid_ether_addr(slave_data->mac_addr)) { ether_addr_copy(priv->mac_addr, slave_data->mac_addr); @@ -1686,6 +1690,7 @@ static int cpsw_dl_switch_mode_set(struct devlink *dl, u32 id, priv = netdev_priv(sl_ndev); slave->port_vlan = vlan; + priv->tx_packet_min = CPSW_MIN_PACKET_SIZE_VLAN; if (netif_running(sl_ndev)) cpsw_port_add_switch_def_ale_entries(priv, slave); @@ -1714,6 +1719,7 @@ static int cpsw_dl_switch_mode_set(struct devlink *dl, u32 id, priv = netdev_priv(slave->ndev); slave->port_vlan = slave->data->dual_emac_res_vlan; + priv->tx_packet_min = CPSW_MIN_PACKET_SIZE; cpsw_port_add_dual_emac_def_ale_entries(priv, slave); } diff --git a/drivers/net/ethernet/ti/cpsw_priv.h b/drivers/net/ethernet/ti/cpsw_priv.h index a323bea54faa..2951fb7b9dae 100644 --- a/drivers/net/ethernet/ti/cpsw_priv.h +++ b/drivers/net/ethernet/ti/cpsw_priv.h @@ -89,7 +89,8 @@ do { \ #define CPSW_POLL_WEIGHT 64 #define CPSW_RX_VLAN_ENCAP_HDR_SIZE 4 -#define CPSW_MIN_PACKET_SIZE (VLAN_ETH_ZLEN) +#define CPSW_MIN_PACKET_SIZE_VLAN (VLAN_ETH_ZLEN) +#define CPSW_MIN_PACKET_SIZE (ETH_ZLEN) #define CPSW_MAX_PACKET_SIZE (VLAN_ETH_FRAME_LEN +\ ETH_FCS_LEN +\ CPSW_RX_VLAN_ENCAP_HDR_SIZE) @@ -380,6 +381,7 @@ struct cpsw_priv { u32 emac_port; struct cpsw_common *cpsw; int offload_fwd_mark; + u32 tx_packet_min; }; #define ndev_to_cpsw(ndev) (((struct cpsw_priv *)netdev_priv(ndev))->cpsw)