From patchwork Mon Mar 1 16:06:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 389620 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=-18.8 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=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 30DC7C433DB for ; Mon, 1 Mar 2021 18:40:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC11960233 for ; Mon, 1 Mar 2021 18:40:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238551AbhCASkX (ORCPT ); Mon, 1 Mar 2021 13:40:23 -0500 Received: from mail.kernel.org ([198.145.29.99]:48122 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239994AbhCASfN (ORCPT ); Mon, 1 Mar 2021 13:35:13 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 165A965015; Mon, 1 Mar 2021 17:10:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614618648; bh=y0uM8dT4BHC+eUDgC+Lr0jtDktjYvd9gt5X7yTLVvfU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RKoY8Cz2ljw7upDaFwdjSvycU6i03gmQLRRy9PjKnKMxFku4JzSwO3+jabz7HxGTN eQveYWgDU8OE7dkdQcAWHgCGUQM1kIXiyDfRqKNhnB5/WdtbLZfT0X3C71aPvyPyt9 SAbhy9DXuONUYqsZn7yRVDq87dXigNTIaL8GQWDY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Maxime Chevallier , "David S. Miller" , Sasha Levin Subject: [PATCH 5.10 134/663] net: mvneta: Remove per-cpu queue mapping for Armada 3700 Date: Mon, 1 Mar 2021 17:06:22 +0100 Message-Id: <20210301161148.382847468@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161141.760350206@linuxfoundation.org> References: <20210301161141.760350206@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Maxime Chevallier [ Upstream commit cf9bf871280d9e0a8869d98c2602d29caf69dfa3 ] According to Errata #23 "The per-CPU GbE interrupt is limited to Core 0", we can't use the per-cpu interrupt mechanism on the Armada 3700 familly. This is correctly checked for RSS configuration, but the initial queue mapping is still done by having the queues spread across all the CPUs in the system, both in the init path and in the cpu_hotplug path. Fixes: 2636ac3cc2b4 ("net: mvneta: Add network support for Armada 3700 SoC") Signed-off-by: Maxime Chevallier Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/marvell/mvneta.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index ceb4f27898002..c6b735b305156 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -3409,7 +3409,9 @@ static int mvneta_txq_sw_init(struct mvneta_port *pp, return -ENOMEM; /* Setup XPS mapping */ - if (txq_number > 1) + if (pp->neta_armada3700) + cpu = 0; + else if (txq_number > 1) cpu = txq->id % num_present_cpus(); else cpu = pp->rxq_def % num_present_cpus(); @@ -4187,6 +4189,11 @@ static int mvneta_cpu_online(unsigned int cpu, struct hlist_node *node) node_online); struct mvneta_pcpu_port *port = per_cpu_ptr(pp->ports, cpu); + /* Armada 3700's per-cpu interrupt for mvneta is broken, all interrupts + * are routed to CPU 0, so we don't need all the cpu-hotplug support + */ + if (pp->neta_armada3700) + return 0; spin_lock(&pp->lock); /*