From patchwork Tue Jul 20 08:41:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Abeni X-Patchwork-Id: 482023 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=-17.2 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 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 40F17C07E9B for ; Tue, 20 Jul 2021 08:56:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A9A161209 for ; Tue, 20 Jul 2021 08:56:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235178AbhGTIPL (ORCPT ); Tue, 20 Jul 2021 04:15:11 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:26689 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235169AbhGTIMi (ORCPT ); Tue, 20 Jul 2021 04:12:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1626771196; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HxPT38iVWdFLwRh86x5TFPqsSIEZeXMoQhmGF21B+Y8=; b=MWqheXHGBm5dmovQZtYnmeTCRUe01cH9YQiTijtFf1IDVnQKXkWDA3zamcJ5p28yRchUAF IIyHFBNSOJzAYVEmXrAMPfLv7GbwQ9PXcCShvd43MUtcKxRYjZanRXBjh/DtElcOv1pDY3 EYWeZl7PjvrSswAdtFJ/g3h/t8owS4A= 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-282--cEaa1c8OtamAlzGa3oGSQ-1; Tue, 20 Jul 2021 04:45:06 -0400 X-MC-Unique: -cEaa1c8OtamAlzGa3oGSQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9DFD41940921; Tue, 20 Jul 2021 08:45:05 +0000 (UTC) Received: from gerbillo.redhat.com (ovpn-114-77.ams2.redhat.com [10.36.114.77]) by smtp.corp.redhat.com (Postfix) with ESMTP id 38C8B18F0A; Tue, 20 Jul 2021 08:45:04 +0000 (UTC) From: Paolo Abeni To: netdev@vger.kernel.org Cc: "David S. Miller" , Jakub Kicinski , Shuah Khan , toke@redhat.com Subject: [PATCH net-next 4/5] veth: create by default nr_possible_cpus queues Date: Tue, 20 Jul 2021 10:41:51 +0200 Message-Id: <27e2e3fa5df299779f5a90489447ff6c46253f02.1626768072.git.pabeni@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This allows easier XDP usage. The number of default active queues is not changed: 1 RX and 1 TX so that this does not introduce overhead on the datapath for queue selection. v1 -> v2: - drop the module parameter, force default to nr_possible_cpus - Toke Signed-off-by: Paolo Abeni --- note: I think here a kernel module parameter to make the default num_{r,t}x_queues configurable could be worthy... --- drivers/net/veth.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index ae869c097587..381670c08ba7 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -1609,6 +1609,23 @@ static void veth_disable_gro(struct net_device *dev) netdev_update_features(dev); } +static int veth_init_queues(struct net_device *dev, struct nlattr *tb[]) +{ + int err; + + if (!tb[IFLA_NUM_TX_QUEUES] && dev->num_tx_queues > 1) { + err = netif_set_real_num_tx_queues(dev, 1); + if (err) + return err; + } + if (!tb[IFLA_NUM_RX_QUEUES] && dev->num_rx_queues > 1) { + err = netif_set_real_num_rx_queues(dev, 1); + if (err) + return err; + } + return 0; +} + static int veth_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) @@ -1718,13 +1735,21 @@ static int veth_newlink(struct net *src_net, struct net_device *dev, priv = netdev_priv(dev); rcu_assign_pointer(priv->peer, peer); + err = veth_init_queues(dev, tb); + if (err) + goto err_queues; priv = netdev_priv(peer); rcu_assign_pointer(priv->peer, dev); + err = veth_init_queues(peer, tb); + if (err) + goto err_queues; veth_disable_gro(dev); return 0; +err_queues: + unregister_netdevice(dev); err_register_dev: /* nothing to do */ err_configure_peer: @@ -1770,6 +1795,16 @@ static struct net *veth_get_link_net(const struct net_device *dev) return peer ? dev_net(peer) : dev_net(dev); } +static unsigned int veth_get_num_queues(void) +{ + /* enforce the same queue limit as rtnl_create_link */ + int queues = num_possible_cpus(); + + if (queues > 4096) + queues = 4096; + return queues; +} + static struct rtnl_link_ops veth_link_ops = { .kind = DRV_NAME, .priv_size = sizeof(struct veth_priv), @@ -1780,6 +1815,8 @@ static struct rtnl_link_ops veth_link_ops = { .policy = veth_policy, .maxtype = VETH_INFO_MAX, .get_link_net = veth_get_link_net, + .get_num_tx_queues = veth_get_num_queues, + .get_num_rx_queues = veth_get_num_queues, }; /*