From patchwork Thu Dec 17 18:30:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Chulski X-Patchwork-Id: 345909 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 74D46C4361B for ; Thu, 17 Dec 2020 18:33:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3306523975 for ; Thu, 17 Dec 2020 18:33:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730050AbgLQSdT (ORCPT ); Thu, 17 Dec 2020 13:33:19 -0500 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:21244 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728080AbgLQSdS (ORCPT ); Thu, 17 Dec 2020 13:33:18 -0500 Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 0BHIPTmS027002; Thu, 17 Dec 2020 10:30:26 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=pfpt0220; bh=43M/47gFEKR/WDfvU4oMdO7tv2WEzlESQApEb8KWowE=; b=drYaiE44evVk6Cxd3girmXigNrCPeJyJBmLoky4b8kPKeNcpKkgkJOawpCgPvlqva51a fLqx/3f0gO1n/eK8HzSTjjzqvnhKBNk8phHZaPqLiMJvHwUdIItCQmPtBYD08T0Dd7fG uEI/D5Lpch9d134Qizkrjapv7gmJ37O6jvUoVrXhJ8L+vkotb5+j13N61Fg12JyHnabw 2OSi/fmedii4Jj8hGctrhrdIxSch2iAe0N7p45wEmct625fpRJg2BdFRI2bHrZY/F2wR pf3UK1oTKjHVn3utnNueprEN6dySvGniIZ88SaooKWfX2ioVvRHMuln0Jufbt0iDuW/J 0Q== Received: from sc-exch03.marvell.com ([199.233.58.183]) by mx0b-0016f401.pphosted.com with ESMTP id 35cx8tgnuh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Thu, 17 Dec 2020 10:30:26 -0800 Received: from DC5-EXCH01.marvell.com (10.69.176.38) by SC-EXCH03.marvell.com (10.93.176.83) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 17 Dec 2020 10:30:24 -0800 Received: from maili.marvell.com (10.69.176.80) by DC5-EXCH01.marvell.com (10.69.176.38) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 17 Dec 2020 10:30:24 -0800 Received: from stefan-pc.marvell.com (unknown [10.5.25.21]) by maili.marvell.com (Postfix) with ESMTP id 923713F7040; Thu, 17 Dec 2020 10:30:21 -0800 (PST) From: To: CC: , , , , , , , , , , Subject: [PATCH net v2] net: mvpp2: Add TCAM entry to drop flow control pause frames Date: Thu, 17 Dec 2020 20:30:17 +0200 Message-ID: <1608229817-21951-1-git-send-email-stefanc@marvell.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343, 18.0.737 definitions=2020-12-17_13:2020-12-15,2020-12-17 signatures=0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Stefan Chulski Issue: Flow control frame used to pause GoP(MAC) was delivered to the CPU and created a load on the CPU. Since XOFF/XON frames are used only by MAC, these frames should be dropped inside MAC. Fix: According to 802.3-2012 - IEEE Standard for Ethernet pause frame has unique destination MAC address 01-80-C2-00-00-01. Add TCAM parser entry to track and drop pause frames by destination MAC. Fixes: 3f518509dedc ("ethernet: Add new driver for Marvell Armada 375 network unit") Signed-off-by: Stefan Chulski --- Changes in v2: - Fix "fixes tag" drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c | 34 ++++++++++++++++++++ drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h | 2 +- 2 files changed, 35 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c index 1a272c2..3a9c747 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c @@ -405,6 +405,39 @@ static int mvpp2_prs_tcam_first_free(struct mvpp2 *priv, unsigned char start, return -EINVAL; } +/* Drop flow control pause frames */ +static void mvpp2_prs_drop_fc(struct mvpp2 *priv) +{ + struct mvpp2_prs_entry pe; + unsigned int len; + unsigned char da[ETH_ALEN] = { + 0x01, 0x80, 0xC2, 0x00, 0x00, 0x01 }; + + memset(&pe, 0, sizeof(pe)); + + /* For all ports - drop flow control frames */ + pe.index = MVPP2_PE_FC_DROP; + mvpp2_prs_tcam_lu_set(&pe, MVPP2_PRS_LU_MAC); + + /* Set match on DA */ + len = ETH_ALEN; + while (len--) + mvpp2_prs_tcam_data_byte_set(&pe, len, da[len], 0xff); + + mvpp2_prs_sram_ri_update(&pe, MVPP2_PRS_RI_DROP_MASK, + MVPP2_PRS_RI_DROP_MASK); + + mvpp2_prs_sram_bits_set(&pe, MVPP2_PRS_SRAM_LU_GEN_BIT, 1); + mvpp2_prs_sram_next_lu_set(&pe, MVPP2_PRS_LU_FLOWS); + + /* Mask all ports */ + mvpp2_prs_tcam_port_map_set(&pe, MVPP2_PRS_PORT_MASK); + + /* Update shadow table and hw entry */ + mvpp2_prs_shadow_set(priv, pe.index, MVPP2_PRS_LU_MAC); + mvpp2_prs_hw_write(priv, &pe); +} + /* Enable/disable dropping all mac da's */ static void mvpp2_prs_mac_drop_all_set(struct mvpp2 *priv, int port, bool add) { @@ -1168,6 +1201,7 @@ static void mvpp2_prs_mac_init(struct mvpp2 *priv) mvpp2_prs_hw_write(priv, &pe); /* Create dummy entries for drop all and promiscuous modes */ + mvpp2_prs_drop_fc(priv); mvpp2_prs_mac_drop_all_set(priv, 0, false); mvpp2_prs_mac_promisc_set(priv, 0, MVPP2_PRS_L2_UNI_CAST, false); mvpp2_prs_mac_promisc_set(priv, 0, MVPP2_PRS_L2_MULTI_CAST, false); diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h index e22f6c8..4b68dd3 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h @@ -129,7 +129,7 @@ #define MVPP2_PE_VID_EDSA_FLTR_DEFAULT (MVPP2_PRS_TCAM_SRAM_SIZE - 7) #define MVPP2_PE_VLAN_DBL (MVPP2_PRS_TCAM_SRAM_SIZE - 6) #define MVPP2_PE_VLAN_NONE (MVPP2_PRS_TCAM_SRAM_SIZE - 5) -/* reserved */ +#define MVPP2_PE_FC_DROP (MVPP2_PRS_TCAM_SRAM_SIZE - 4) #define MVPP2_PE_MAC_MC_PROMISCUOUS (MVPP2_PRS_TCAM_SRAM_SIZE - 3) #define MVPP2_PE_MAC_UC_PROMISCUOUS (MVPP2_PRS_TCAM_SRAM_SIZE - 2) #define MVPP2_PE_MAC_NON_PROMISCUOUS (MVPP2_PRS_TCAM_SRAM_SIZE - 1)