From patchwork Thu Jan 12 17:24:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 13098500 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C1905C54EBE for ; Thu, 12 Jan 2023 17:26:30 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pG1K9-0006e6-8L; Thu, 12 Jan 2023 12:25:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pG1K7-0006dB-9E for qemu-devel@nongnu.org; Thu, 12 Jan 2023 12:25:07 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pG1K5-0008RP-P9 for qemu-devel@nongnu.org; Thu, 12 Jan 2023 12:25:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673544305; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OPoj2lVJsWprqpmTaHUkjMZg3CvrA3oSBniXKgLWMks=; b=FI9AIQmFq5zCQPY+7nk+bFc4Lm+j1VbCvf1/BogUVNNZ6CCO7gDadGdklEVxc4d9hneKtT wDfqDm57nZFWauz74iO7hA0aOfYxtmsRSRCXfNWkDuaWUhRLykrEBuu5meHVyjeVBEtHBh J2g7r0aLJgCIGONQTjkDYMpRKc7KX58= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-617-CJIBQHQXO_e4oCaU984VEA-1; Thu, 12 Jan 2023 12:25:01 -0500 X-MC-Unique: CJIBQHQXO_e4oCaU984VEA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CE74D85D067; Thu, 12 Jan 2023 17:25:00 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.72]) by smtp.corp.redhat.com (Postfix) with ESMTP id A3DAC4078903; Thu, 12 Jan 2023 17:24:57 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: si-wei.liu@oracle.com, Liuxiangdong , Zhu Lingshan , "Gonglei (Arei)" , alvaro.karsz@solid-run.com, Shannon Nelson , Laurent Vivier , Harpreet Singh Anand , Gautam Dawar , Stefano Garzarella , Cornelia Huck , Cindy Lu , Eli Cohen , Paolo Bonzini , "Michael S. Tsirkin" , Jason Wang , Stefan Hajnoczi , Parav Pandit Subject: [RFC v2 06/13] vhost: delay set_vring_ready after DRIVER_OK Date: Thu, 12 Jan 2023 18:24:27 +0100 Message-Id: <20230112172434.760850-7-eperezma@redhat.com> In-Reply-To: <20230112172434.760850-1-eperezma@redhat.com> References: <20230112172434.760850-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass client-ip=170.10.129.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org To restore the device at the destination of a live migration we send the commands through control virtqueue. For a device to read CVQ it must have received the DRIVER_OK status bit. However this opens a window where the device could start receiving packets in rx queue 0 before it receives the RSS configuration. To avoid that, we will not send vring_enable until all configuration is used by the device. As a first step, run vhost_set_vring_ready for all vhost_net backend after all of them are started (with DRIVER_OK). This code should not affect vdpa. Signed-off-by: Eugenio Pérez --- hw/net/vhost_net.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c index c4eecc6f36..3900599465 100644 --- a/hw/net/vhost_net.c +++ b/hw/net/vhost_net.c @@ -399,6 +399,18 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs, } else { peer = qemu_get_peer(ncs, n->max_queue_pairs); } + r = vhost_net_start_one(get_vhost_net(peer), dev); + if (r < 0) { + goto err_start; + } + } + + for (int j = 0; j < nvhosts; j++) { + if (j < data_queue_pairs) { + peer = qemu_get_peer(ncs, j); + } else { + peer = qemu_get_peer(ncs, n->max_queue_pairs); + } if (peer->vring_enable) { /* restore vring enable state */ @@ -408,11 +420,6 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs, goto err_start; } } - - r = vhost_net_start_one(get_vhost_net(peer), dev); - if (r < 0) { - goto err_start; - } } return 0;