From patchwork Fri Jul 9 09:39:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Abeni X-Patchwork-Id: 472221 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=-16.4 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 F1722C07E99 for ; Fri, 9 Jul 2021 09:40:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C78FD613D1 for ; Fri, 9 Jul 2021 09:40:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231985AbhGIJnl (ORCPT ); Fri, 9 Jul 2021 05:43:41 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:26830 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229503AbhGIJnk (ORCPT ); Fri, 9 Jul 2021 05:43:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1625823657; 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=ZfZHL5fbmr8yT35waIQmfNtXY4S5S/FXv6+ho9UwyGk=; b=RHysZCMhrlXObOb63d60lNz5/Hx6IODPPfS9LS90sFlrou951VhoBVL3urtpT5cZqv8AmY eX7eljY3pKpjwgDGuvQJajnuFBIp1Xh5ZIwJLvnlP0PPNNPkmICMyBqVw3xQZEOUZg1mOy VNKl5xpLCCJfX/hJyD2THouA55/uD8A= 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-517-mE5vf8anPUKI2hSYhjYPIA-1; Fri, 09 Jul 2021 05:40:55 -0400 X-MC-Unique: mE5vf8anPUKI2hSYhjYPIA-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 AA7B980006E; Fri, 9 Jul 2021 09:40:54 +0000 (UTC) Received: from gerbillo.redhat.com (ovpn-113-68.ams2.redhat.com [10.36.113.68]) by smtp.corp.redhat.com (Postfix) with ESMTP id 242FC369A; Fri, 9 Jul 2021 09:40:51 +0000 (UTC) From: Paolo Abeni To: netdev@vger.kernel.org Cc: "David S. Miller" , Jakub Kicinski , toke@redhat.com Subject: [RFC PATCH 1/3] veth: implement support for set_channel ethtool op Date: Fri, 9 Jul 2021 11:39:48 +0200 Message-Id: <681c32be3a9172e9468893a89fb928b46c5c5ee6.1625823139.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 change implements the set_channel() ethtool operation, preserving the current defaults values and allowing up set the number of queues in the range set ad device creation time. Signed-off-by: Paolo Abeni --- drivers/net/veth.c | 62 +++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 58 insertions(+), 4 deletions(-) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index bdb7ce3cb054..10360228a06a 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -72,6 +72,8 @@ struct veth_priv { atomic64_t dropped; struct bpf_prog *_xdp_prog; struct veth_rq *rq; + unsigned int num_tx_queues; + unsigned int num_rx_queues; unsigned int requested_headroom; }; @@ -224,10 +226,49 @@ static void veth_get_channels(struct net_device *dev, { channels->tx_count = dev->real_num_tx_queues; channels->rx_count = dev->real_num_rx_queues; - channels->max_tx = dev->real_num_tx_queues; - channels->max_rx = dev->real_num_rx_queues; + channels->max_tx = dev->num_tx_queues; + channels->max_rx = dev->num_rx_queues; channels->combined_count = min(dev->real_num_rx_queues, dev->real_num_tx_queues); - channels->max_combined = min(dev->real_num_rx_queues, dev->real_num_tx_queues); + channels->max_combined = min(dev->num_rx_queues, dev->num_tx_queues); +} + +static int veth_close(struct net_device *dev); +static int veth_open(struct net_device *dev); + +static int veth_set_channels(struct net_device *dev, + struct ethtool_channels *ch) +{ + struct veth_priv *priv = netdev_priv(dev); + struct veth_priv *peer_priv; + + /* accept changes only on rx/tx */ + if (ch->combined_count != min(dev->real_num_rx_queues, dev->real_num_tx_queues)) + return -EINVAL; + + /* respect contraint posed at device creation time */ + if (ch->rx_count > dev->num_rx_queues || ch->tx_count > dev->num_tx_queues) + return -EINVAL; + + if (!ch->rx_count || !ch->tx_count) + return -EINVAL; + + /* avoid braking XDP, if that is enabled */ + if (priv->_xdp_prog && ch->rx_count < priv->peer->real_num_tx_queues) + return -EINVAL; + + peer_priv = netdev_priv(priv->peer); + if (peer_priv->_xdp_prog && ch->tx_count > priv->peer->real_num_rx_queues) + return -EINVAL; + + if (netif_running(dev)) + veth_close(dev); + + priv->num_tx_queues = ch->tx_count; + priv->num_rx_queues = ch->rx_count; + + if (netif_running(dev)) + veth_open(dev); + return 0; } static const struct ethtool_ops veth_ethtool_ops = { @@ -239,6 +280,7 @@ static const struct ethtool_ops veth_ethtool_ops = { .get_link_ksettings = veth_get_link_ksettings, .get_ts_info = ethtool_op_get_ts_info, .get_channels = veth_get_channels, + .set_channels = veth_set_channels, }; /* general routines */ @@ -1104,6 +1146,14 @@ static int veth_open(struct net_device *dev) if (!peer) return -ENOTCONN; + err = netif_set_real_num_rx_queues(dev, priv->num_rx_queues); + if (err) + return err; + + err = netif_set_real_num_tx_queues(dev, priv->num_tx_queues); + if (err) + return err; + if (priv->_xdp_prog) { err = veth_enable_xdp(dev); if (err) @@ -1551,14 +1601,18 @@ static int veth_newlink(struct net *src_net, struct net_device *dev, netif_carrier_off(dev); /* - * tie the deviced together + * tie the deviced together and init the default queue nr */ priv = netdev_priv(dev); rcu_assign_pointer(priv->peer, peer); + priv->num_tx_queues = dev->num_tx_queues; + priv->num_rx_queues = dev->num_rx_queues; priv = netdev_priv(peer); rcu_assign_pointer(priv->peer, dev); + priv->num_tx_queues = peer->num_tx_queues; + priv->num_rx_queues = peer->num_rx_queues; veth_disable_gro(dev); return 0;