From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 0706DC07E94 for ; Fri, 4 Jun 2021 07:39:28 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 9A2C2613BF for ; Fri, 4 Jun 2021 07:39:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A2C2613BF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:33880 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lp4QQ-0003Pz-Qa for qemu-devel@archiver.kernel.org; Fri, 04 Jun 2021 03:39:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49850) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lp4Ni-0004jM-3O for qemu-devel@nongnu.org; Fri, 04 Jun 2021 03:36:39 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:21101) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lp4Ng-0001aG-06 for qemu-devel@nongnu.org; Fri, 04 Jun 2021 03:36:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1622792195; 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=mx73yWAEftgr6pgsLC+IHDZMF4NSAJIPQWWCouWwVpk=; b=WmP8HR9MuDn+wctgcoMZyDpmPuXEjzgJ6rVo9fZHozTECA5Mo+jTvN/6TQrbO/knIWJ+eU +KxgJAwsbbYRa0zHynuzXdoOrrWmupQueDSbBBBD9ghvvPD2uxbYXCxKcv1u4/i0cpkXpX j6/BcqvIZXyQtwb3njstYdlIYa7hN7U= 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-585-W6p_UTvlNT-trxAK-VZ35A-1; Fri, 04 Jun 2021 03:36:33 -0400 X-MC-Unique: W6p_UTvlNT-trxAK-VZ35A-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 A62558049D4; Fri, 4 Jun 2021 07:36:32 +0000 (UTC) Received: from localhost.localdomain (ovpn-12-212.pek2.redhat.com [10.72.12.212]) by smtp.corp.redhat.com (Postfix) with ESMTP id C730361008; Fri, 4 Jun 2021 07:36:30 +0000 (UTC) From: Jason Wang To: qemu-devel@nongnu.org, peter.maydell@linaro.org Subject: [PULL 5/7] virtio-net: Added eBPF RSS to virtio-net. Date: Fri, 4 Jun 2021 15:36:15 +0800 Message-Id: <20210604073617.69622-6-jasowang@redhat.com> In-Reply-To: <20210604073617.69622-1-jasowang@redhat.com> References: <20210604073617.69622-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.37, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yuri Benditovich , Andrew Melnychenko , Jason Wang Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Andrew Melnychenko When RSS is enabled the device tries to load the eBPF program to select RX virtqueue in the TUN. If eBPF can be loaded the RSS will function also with vhost (works with kernel 5.8 and later). Software RSS is used as a fallback with vhost=off when eBPF can't be loaded or when hash population requested by the guest. Signed-off-by: Yuri Benditovich Signed-off-by: Andrew Melnychenko Signed-off-by: Jason Wang --- hw/net/vhost_net.c | 3 ++ hw/net/virtio-net.c | 116 +++++++++++++++++++++++++++++++++++++++-- include/hw/virtio/virtio-net.h | 4 ++ net/vhost-vdpa.c | 2 + 4 files changed, 122 insertions(+), 3 deletions(-) diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c index 24d555e..44c1ed9 100644 --- a/hw/net/vhost_net.c +++ b/hw/net/vhost_net.c @@ -45,6 +45,7 @@ static const int kernel_feature_bits[] = { VIRTIO_NET_F_MTU, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_RING_PACKED, + VIRTIO_NET_F_HASH_REPORT, VHOST_INVALID_FEATURE_BIT }; @@ -71,6 +72,8 @@ static const int user_feature_bits[] = { VIRTIO_NET_F_MTU, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_RING_PACKED, + VIRTIO_NET_F_RSS, + VIRTIO_NET_F_HASH_REPORT, /* This bit implies RARP isn't sent by QEMU out of band */ VIRTIO_NET_F_GUEST_ANNOUNCE, diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 6b7e8dd..613be07 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -737,8 +737,9 @@ static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, return features; } - virtio_clear_feature(&features, VIRTIO_NET_F_RSS); - virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT); + if (!ebpf_rss_is_loaded(&n->ebpf_rss)) { + virtio_clear_feature(&features, VIRTIO_NET_F_RSS); + } features = vhost_net_get_features(get_vhost_net(nc->peer), features); vdev->backend_features = features; @@ -1163,12 +1164,79 @@ static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, } } +static void virtio_net_detach_epbf_rss(VirtIONet *n); + static void virtio_net_disable_rss(VirtIONet *n) { if (n->rss_data.enabled) { trace_virtio_net_rss_disable(); } n->rss_data.enabled = false; + + virtio_net_detach_epbf_rss(n); +} + +static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd) +{ + NetClientState *nc = qemu_get_peer(qemu_get_queue(nic), 0); + if (nc == NULL || nc->info->set_steering_ebpf == NULL) { + return false; + } + + return nc->info->set_steering_ebpf(nc, prog_fd); +} + +static void rss_data_to_rss_config(struct VirtioNetRssData *data, + struct EBPFRSSConfig *config) +{ + config->redirect = data->redirect; + config->populate_hash = data->populate_hash; + config->hash_types = data->hash_types; + config->indirections_len = data->indirections_len; + config->default_queue = data->default_queue; +} + +static bool virtio_net_attach_epbf_rss(VirtIONet *n) +{ + struct EBPFRSSConfig config = {}; + + if (!ebpf_rss_is_loaded(&n->ebpf_rss)) { + return false; + } + + rss_data_to_rss_config(&n->rss_data, &config); + + if (!ebpf_rss_set_all(&n->ebpf_rss, &config, + n->rss_data.indirections_table, n->rss_data.key)) { + return false; + } + + if (!virtio_net_attach_ebpf_to_backend(n->nic, n->ebpf_rss.program_fd)) { + return false; + } + + return true; +} + +static void virtio_net_detach_epbf_rss(VirtIONet *n) +{ + virtio_net_attach_ebpf_to_backend(n->nic, -1); +} + +static bool virtio_net_load_ebpf(VirtIONet *n) +{ + if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) { + /* backend does't support steering ebpf */ + return false; + } + + return ebpf_rss_load(&n->ebpf_rss); +} + +static void virtio_net_unload_ebpf(VirtIONet *n) +{ + virtio_net_attach_ebpf_to_backend(n->nic, -1); + ebpf_rss_unload(&n->ebpf_rss); } static uint16_t virtio_net_handle_rss(VirtIONet *n, @@ -1283,6 +1351,25 @@ static uint16_t virtio_net_handle_rss(VirtIONet *n, goto error; } n->rss_data.enabled = true; + + if (!n->rss_data.populate_hash) { + if (!virtio_net_attach_epbf_rss(n)) { + /* EBPF must be loaded for vhost */ + if (get_vhost_net(qemu_get_queue(n->nic)->peer)) { + warn_report("Can't load eBPF RSS for vhost"); + goto error; + } + /* fallback to software RSS */ + warn_report("Can't load eBPF RSS - fallback to software RSS"); + n->rss_data.enabled_software_rss = true; + } + } else { + /* use software RSS for hash populating */ + /* and detach eBPF if was loaded before */ + virtio_net_detach_epbf_rss(n); + n->rss_data.enabled_software_rss = true; + } + trace_virtio_net_rss_enable(n->rss_data.hash_types, n->rss_data.indirections_len, temp.b); @@ -1668,7 +1755,7 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, return -1; } - if (!no_rss && n->rss_data.enabled) { + if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) { int index = virtio_net_process_rss(nc, buf, size); if (index >= 0) { NetClientState *nc2 = qemu_get_subqueue(n->nic, index); @@ -2772,6 +2859,19 @@ static int virtio_net_post_load_device(void *opaque, int version_id) } if (n->rss_data.enabled) { + n->rss_data.enabled_software_rss = n->rss_data.populate_hash; + if (!n->rss_data.populate_hash) { + if (!virtio_net_attach_epbf_rss(n)) { + if (get_vhost_net(qemu_get_queue(n->nic)->peer)) { + warn_report("Can't post-load eBPF RSS for vhost"); + } else { + warn_report("Can't post-load eBPF RSS - " + "fallback to software RSS"); + n->rss_data.enabled_software_rss = true; + } + } + } + trace_virtio_net_rss_enable(n->rss_data.hash_types, n->rss_data.indirections_len, sizeof(n->rss_data.key)); @@ -3352,6 +3452,10 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp) n->qdev = dev; net_rx_pkt_init(&n->rx_pkt, false); + + if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { + virtio_net_load_ebpf(n); + } } static void virtio_net_device_unrealize(DeviceState *dev) @@ -3360,6 +3464,10 @@ static void virtio_net_device_unrealize(DeviceState *dev) VirtIONet *n = VIRTIO_NET(dev); int i, max_queues; + if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { + virtio_net_unload_ebpf(n); + } + /* This will stop vhost backend if appropriate. */ virtio_net_set_status(vdev, 0); @@ -3402,6 +3510,8 @@ static void virtio_net_instance_init(Object *obj) device_add_bootindex_property(obj, &n->nic_conf.bootindex, "bootindex", "/ethernet-phy@0", DEVICE(n)); + + ebpf_rss_init(&n->ebpf_rss); } static int virtio_net_pre_save(void *opaque) diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h index 7e96d19..824a69c 100644 --- a/include/hw/virtio/virtio-net.h +++ b/include/hw/virtio/virtio-net.h @@ -21,6 +21,8 @@ #include "qemu/option_int.h" #include "qom/object.h" +#include "ebpf/ebpf_rss.h" + #define TYPE_VIRTIO_NET "virtio-net-device" OBJECT_DECLARE_SIMPLE_TYPE(VirtIONet, VIRTIO_NET) @@ -130,6 +132,7 @@ typedef struct VirtioNetRscChain { typedef struct VirtioNetRssData { bool enabled; + bool enabled_software_rss; bool redirect; bool populate_hash; uint32_t hash_types; @@ -209,6 +212,7 @@ struct VirtIONet { Notifier migration_state; VirtioNetRssData rss_data; struct NetRxPkt *rx_pkt; + struct EBPFRSSContext ebpf_rss; }; void virtio_net_set_netclient_name(VirtIONet *n, const char *name, diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index fe659ec..8b14215 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -54,6 +54,8 @@ const int vdpa_feature_bits[] = { VIRTIO_NET_F_MTU, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_RING_PACKED, + VIRTIO_NET_F_RSS, + VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_STATUS, VHOST_INVALID_FEATURE_BIT -- 2.7.4