From patchwork Mon Sep 28 18:35:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nitesh Narayan Lal X-Patchwork-Id: 11804567 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8EE0E6CB for ; Mon, 28 Sep 2020 18:36:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6CA93207D8 for ; Mon, 28 Sep 2020 18:36:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ROBDmRC8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726810AbgI1SgU (ORCPT ); Mon, 28 Sep 2020 14:36:20 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:44868 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726799AbgI1SgU (ORCPT ); Mon, 28 Sep 2020 14:36:20 -0400 Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1601318179; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:in-reply-to:in-reply-to:references:references; bh=qD7K+UDAAPv7p1xhR7GsE6Qr4qBNVKTkChHI2rSdLN0=; b=ROBDmRC8mVhOXX8n01XX6+B/1BePrIMcs4cF4NgyrQl24GcQ+nyew5Z7OnMxuRR1SMshBm ZE8TZ+JvN88akOE190Mdk8Uhj3Em7amtJeFQN3HVRXMJAfD40svszvMtjJMu9Y/slQs++W Fp/LOV9NIB6eK5guY1kompMeC2b2h7I= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-378-UZjJXNY8NjeO5agRzp7SQQ-1; Mon, 28 Sep 2020 14:36:14 -0400 X-MC-Unique: UZjJXNY8NjeO5agRzp7SQQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E1AE381CBDD; Mon, 28 Sep 2020 18:36:11 +0000 (UTC) Received: from virtlab719.virt.lab.eng.bos.redhat.com (virtlab719.virt.lab.eng.bos.redhat.com [10.19.153.15]) by smtp.corp.redhat.com (Postfix) with ESMTP id 261AE60C11; Mon, 28 Sep 2020 18:36:10 +0000 (UTC) From: Nitesh Narayan Lal To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, intel-wired-lan@lists.osuosl.org, frederic@kernel.org, mtosatti@redhat.com, sassmann@redhat.com, jesse.brandeburg@intel.com, lihong.yang@intel.com, helgaas@kernel.org, nitesh@redhat.com, jeffrey.t.kirsher@intel.com, jacob.e.keller@intel.com, jlelli@redhat.com, hch@infradead.org, bhelgaas@google.com, mike.marciniszyn@intel.com, dennis.dalessandro@intel.com, thomas.lendacky@amd.com, jiri@nvidia.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, lgoncalv@redhat.com Subject: [PATCH v4 3/4] i40e: Limit msix vectors to housekeeping CPUs Date: Mon, 28 Sep 2020 14:35:28 -0400 Message-Id: <20200928183529.471328-4-nitesh@redhat.com> In-Reply-To: <20200928183529.471328-1-nitesh@redhat.com> References: <20200928183529.471328-1-nitesh@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If we have isolated CPUs designated to perform real-time tasks, to keep the latency overhead to a minimum for real-time CPUs IRQ vectors are moved to housekeeping CPUs from the userspace. Creating MSIX vectors only based on the online CPUs could lead to exhaustion of housekeeping CPU IRQ vectors in such environments. This patch prevents i40e to create vectors only based on online CPUs by retrieving the online housekeeping CPUs that are designated to perform managed IRQ jobs. Signed-off-by: Nitesh Narayan Lal Reviewed-by: Marcelo Tosatti Acked-by: Jesse Brandeburg --- drivers/net/ethernet/intel/i40e/i40e_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 2e433fdbf2c3..370b581cd48c 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -5,6 +5,7 @@ #include #include #include +#include #include /* Local includes */ @@ -11002,7 +11003,7 @@ static int i40e_init_msix(struct i40e_pf *pf) * will use any remaining vectors to reach as close as we can to the * number of online CPUs. */ - cpus = num_online_cpus(); + cpus = housekeeping_num_online_cpus(HK_FLAG_MANAGED_IRQ); pf->num_lan_msix = min_t(int, cpus, vectors_left / 2); vectors_left -= pf->num_lan_msix;