From patchwork Thu Sep 27 06:48:25 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li,Rongqing via dev" X-Patchwork-Id: 975549 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=openvswitch.org (client-ip=140.211.169.12; helo=mail.linuxfoundation.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=openvswitch.org Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=broadcom.com header.i=@broadcom.com header.b="QQ14LiDr"; dkim-atps=neutral Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 42LQB74g3Nz9s1x for ; Thu, 27 Sep 2018 16:38:39 +1000 (AEST) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 700631028; Thu, 27 Sep 2018 06:38:16 +0000 (UTC) X-Original-To: dev@openvswitch.org Delivered-To: ovs-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 53F181009 for ; Thu, 27 Sep 2018 06:38:15 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 836F4F8 for ; Thu, 27 Sep 2018 06:38:14 +0000 (UTC) Received: by mail-wr1-f66.google.com with SMTP id j15-v6so1241975wrt.8 for ; Wed, 26 Sep 2018 23:38:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=bOFxBYZBy7d7vp1sk3Xhg+u6t8ldxEcDab6Xar5IpFA=; b=QQ14LiDrcWh5UA1M6FScHZZ35JsAV+S6UYz2MEqfcSrbVXtQqJ4/38k83f3NuacHjm dI4uZpbD69z8GcvPSOD7Ifwpl0WHSqrW3WaRKWfkqnXg0aaNBn04n6N/6MXM0H6kh2YC 465O9zDG2at6HlzvYKcbTMfkyVx3jSPsavC2I= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=bOFxBYZBy7d7vp1sk3Xhg+u6t8ldxEcDab6Xar5IpFA=; b=sric6cXNiT7GYg6gvoecXAy+24OfW+rziQ39jQFfSYOtQtDq4v4LBdVzZ1IC/TZ0YB v38yRyCVLc03mvLtGmk+bLR3QghYn7rMKyQeE0aXqJFJti8gSBiM+RRlUAF/Agf+6XBW GkPQm9h+7ecbejdtWx1M2nGyPXsQSxsdvfexE3VjvYal33Ffdr58UZko6WSWyq35s4PZ TI8qlFIsagbZfqmTcZPR19Rxnjah9+QLqUz2CySlLY67ouw9PTgBlrFEQHWQZfbfYfJm 3f2dG2jdevulHlFiptjmkhbHiqRBplgIi806/6N1ulmhPBHND1YR5XGRr2Jds4SZd3Vb qEnA== X-Gm-Message-State: ABuFfoinIrqsVOdIaMt/nuw324dXjYK3SS3LDcRv7GyJJBegrR/pR8/Z 9m2k2+DNZwWLs9cP9P89KYY1OZ9kOHg= X-Google-Smtp-Source: ACcGV62yj18DGHdMk1a9B9gBtH9aqvKDYyLa572mxM9jsLW8jBgOv4tf0+isRhQ0zNskBW5l9yY0ag== X-Received: by 2002:adf:f301:: with SMTP id i1-v6mr5104590wro.161.1538030292567; Wed, 26 Sep 2018 23:38:12 -0700 (PDT) Received: from host-10-123-153-36.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id 64-v6sm1488547wrr.64.2018.09.26.23.38.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Sep 2018 23:38:11 -0700 (PDT) To: dev@openvswitch.org Date: Thu, 27 Sep 2018 12:18:25 +0530 Message-Id: <20180927064827.26256-2-sriharsha.basavapatna@broadcom.com> X-Mailer: git-send-email 2.18.0.rc1.1.g6f333ff In-Reply-To: <20180927064827.26256-1-sriharsha.basavapatna@broadcom.com> References: <20180927064827.26256-1-sriharsha.basavapatna@broadcom.com> X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Subject: [ovs-dev] [PATCH v7 1/3] dpif-netlink: Detect Out-Of-Resource condition on a netdev X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Sriharsha Basavapatna via dev From: "Li,Rongqing via dev" Reply-To: Sriharsha Basavapatna MIME-Version: 1.0 Sender: ovs-dev-bounces@openvswitch.org Errors-To: ovs-dev-bounces@openvswitch.org This is the first patch in the patch-set to support dynamic rebalancing of offloaded flows. The patch detects OOR condition on a netdev port when ENOSPC error is returned by TC-Flower while adding a flow rule. A new structure is added to the netdev called "netdev_hw_info", to store OOR related information required to perform dynamic offload-rebalancing. Signed-off-by: Sriharsha Basavapatna Co-authored-by: Venkat Duvvuru Signed-off-by: Venkat Duvvuru Reviewed-by: Sathya Perla --- lib/dpif-netlink.c | 18 +++++++++++++++++- lib/flow.c | 25 +++++++++++++++++++++++++ lib/flow.h | 1 + lib/netdev-provider.h | 11 +++++++++++ lib/netdev.c | 35 +++++++++++++++++++++++++++++++++++ lib/netdev.h | 3 +++ 6 files changed, 92 insertions(+), 1 deletion(-) diff --git a/lib/dpif-netlink.c b/lib/dpif-netlink.c index e6d5a6ec5..b9ce9cbe2 100644 --- a/lib/dpif-netlink.c +++ b/lib/dpif-netlink.c @@ -2178,7 +2178,23 @@ parse_flow_put(struct dpif_netlink *dpif, struct dpif_flow_put *put) VLOG_DBG("added flow"); } else if (err != EEXIST) { - VLOG_ERR_RL(&rl, "failed to offload flow: %s", ovs_strerror(err)); + struct netdev *oor_netdev = NULL; + if (err == ENOSPC && netdev_is_offload_rebalance_policy_enabled()) { + /* + * We need to set OOR on the input netdev (i.e, 'dev') for the + * flow. But if the flow has a tunnel attribute (i.e, decap action, + * with a virtual device like a VxLAN interface as its in-port), + * then lookup and set OOR on the underlying tunnel (real) netdev. + */ + oor_netdev = flow_get_tunnel_netdev(&match.flow.tunnel); + if (!oor_netdev) { + /* Not a 'tunnel' flow */ + oor_netdev = dev; + } + netdev_set_hw_info(oor_netdev, HW_INFO_TYPE_OOR, true); + } + VLOG_ERR_RL(&rl, "failed to offload flow: %s: %s", ovs_strerror(err), + (oor_netdev ? oor_netdev->name : dev->name)); } out: diff --git a/lib/flow.c b/lib/flow.c index 77ed3d9df..a39807908 100644 --- a/lib/flow.c +++ b/lib/flow.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -41,6 +42,8 @@ #include "unaligned.h" #include "util.h" #include "openvswitch/nsh.h" +#include "ovs-router.h" +#include "lib/netdev-provider.h" COVERAGE_DEFINE(flow_extract); COVERAGE_DEFINE(miniflow_malloc); @@ -3403,3 +3406,25 @@ flow_limit_vlans(int vlan_limit) flow_vlan_limit = MIN(vlan_limit, FLOW_MAX_VLAN_HEADERS); } } + +struct netdev * +flow_get_tunnel_netdev(struct flow_tnl *tunnel) +{ + char iface[IFNAMSIZ]; + struct in6_addr ip6; + struct in6_addr gw; + + if (tunnel->ip_src) { + in6_addr_set_mapped_ipv4(&ip6, tunnel->ip_src); + } else if (ipv6_addr_is_set(&tunnel->ipv6_src)) { + ip6 = tunnel->ipv6_src; + } else { + return NULL; + } + + if (!ovs_router_lookup(0, &ip6, iface, NULL, &gw)) { + return NULL; + } + + return netdev_from_name(iface); +} diff --git a/lib/flow.h b/lib/flow.h index d03f1ba9c..aca60c41a 100644 --- a/lib/flow.h +++ b/lib/flow.h @@ -73,6 +73,7 @@ void flow_extract(struct dp_packet *, struct flow *); void flow_zero_wildcards(struct flow *, const struct flow_wildcards *); void flow_unwildcard_tp_ports(const struct flow *, struct flow_wildcards *); void flow_get_metadata(const struct flow *, struct match *flow_metadata); +struct netdev *flow_get_tunnel_netdev(struct flow_tnl *tunnel); const char *ct_state_to_string(uint32_t state); uint32_t ct_state_from_string(const char *); diff --git a/lib/netdev-provider.h b/lib/netdev-provider.h index 5a7947351..e320dad61 100644 --- a/lib/netdev-provider.h +++ b/lib/netdev-provider.h @@ -35,6 +35,15 @@ extern "C" { struct netdev_tnl_build_header_params; #define NETDEV_NUMA_UNSPEC OVS_NUMA_UNSPEC +/* Offload-capable (HW) netdev information */ +struct netdev_hw_info { + bool oor; /* Out of Offload Resources ? */ +}; + +enum hw_info_type { + HW_INFO_TYPE_OOR = 1 /* OOR state */ +}; + /* A network device (e.g. an Ethernet device). * * Network device implementations may read these members but should not modify @@ -80,6 +89,8 @@ struct netdev { int n_rxq; struct shash_node *node; /* Pointer to element in global map. */ struct ovs_list saved_flags_list; /* Contains "struct netdev_saved_flags". */ + + struct netdev_hw_info hw_info; /* offload-capable netdev info */ }; static inline void diff --git a/lib/netdev.c b/lib/netdev.c index 690d28409..3e2ce7c09 100644 --- a/lib/netdev.c +++ b/lib/netdev.c @@ -415,6 +415,7 @@ netdev_open(const char *name, const char *type, struct netdev **netdevp) netdev->reconfigure_seq = seq_create(); netdev->last_reconfigure_seq = seq_read(netdev->reconfigure_seq); + netdev->hw_info.oor = false; netdev->node = shash_add(&netdev_shash, name, netdev); /* By default enable one tx and rx queue per netdev. */ @@ -2252,6 +2253,31 @@ netdev_get_block_id(struct netdev *netdev) : 0); } +/* + * Get the value of the hw info parameter specified by type. + * Returns the value on success (>= 0). Returns -1 on failure. + */ +int +netdev_get_hw_info(struct netdev *netdev, int type) +{ + if (type == HW_INFO_TYPE_OOR) { + return netdev->hw_info.oor; + } + + return -1; +} + +/* + * Set the value of the hw info parameter specified by type. + */ +void +netdev_set_hw_info(struct netdev *netdev, int type, int val) +{ + if (type == HW_INFO_TYPE_OOR) { + netdev->hw_info.oor = val; + } +} + bool netdev_is_flow_api_enabled(void) { @@ -2489,6 +2515,15 @@ netdev_free_custom_stats_counters(struct netdev_custom_stats *custom_stats) } #ifdef __linux__ + +static bool netdev_offload_rebalance_policy = false; + +bool +netdev_is_offload_rebalance_policy_enabled(void) +{ + return netdev_offload_rebalance_policy; +} + static void netdev_ports_flow_init(void) { diff --git a/lib/netdev.h b/lib/netdev.h index 556676046..b0e5c5b72 100644 --- a/lib/netdev.h +++ b/lib/netdev.h @@ -227,8 +227,11 @@ int netdev_flow_del(struct netdev *, const ovs_u128 *, struct dpif_flow_stats *); int netdev_init_flow_api(struct netdev *); uint32_t netdev_get_block_id(struct netdev *); +int netdev_get_hw_info(struct netdev *, int); +void netdev_set_hw_info(struct netdev *, int, int); bool netdev_is_flow_api_enabled(void); void netdev_set_flow_api_enabled(const struct smap *ovs_other_config); +bool netdev_is_offload_rebalance_policy_enabled(void); struct dpif_port; int netdev_ports_insert(struct netdev *, const struct dpif_class *, From patchwork Thu Sep 27 06:48:26 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li,Rongqing via dev" X-Patchwork-Id: 975550 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=openvswitch.org (client-ip=140.211.169.12; helo=mail.linuxfoundation.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=openvswitch.org Authentication-Results: ozlabs.org; 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Wed, 26 Sep 2018 23:38:15 -0700 (PDT) Received: from host-10-123-153-36.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id 64-v6sm1488547wrr.64.2018.09.26.23.38.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Sep 2018 23:38:15 -0700 (PDT) To: dev@openvswitch.org Date: Thu, 27 Sep 2018 12:18:26 +0530 Message-Id: <20180927064827.26256-3-sriharsha.basavapatna@broadcom.com> X-Mailer: git-send-email 2.18.0.rc1.1.g6f333ff In-Reply-To: <20180927064827.26256-1-sriharsha.basavapatna@broadcom.com> References: <20180927064827.26256-1-sriharsha.basavapatna@broadcom.com> X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Subject: [ovs-dev] [PATCH v7 2/3] revalidator: Gather packets-per-second rate of flows X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Sriharsha Basavapatna via dev From: "Li,Rongqing via dev" Reply-To: Sriharsha Basavapatna MIME-Version: 1.0 Sender: ovs-dev-bounces@openvswitch.org Errors-To: ovs-dev-bounces@openvswitch.org This is the second patch in the patch-set to support dynamic rebalancing of offloaded flows. The packets-per-second (pps) rate for each flow is computed in the context of revalidator threads when the flow stats are retrieved. The pps-rate is computed only after a flow is revalidated and is not scheduled for deletion. The parameters used to compute pps and the pps itself are saved in udpif_key since they need to be persisted across iterations of rebalancing. Signed-off-by: Sriharsha Basavapatna Co-authored-by: Venkat Duvvuru Signed-off-by: Venkat Duvvuru Reviewed-by: Sathya Perla --- lib/dpif-provider.h | 1 + ofproto/ofproto-dpif-upcall.c | 51 +++++++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h index 873b6e3d4..7a71f5c0a 100644 --- a/lib/dpif-provider.h +++ b/lib/dpif-provider.h @@ -39,6 +39,7 @@ struct dpif { char *full_name; uint8_t netflow_engine_type; uint8_t netflow_engine_id; + long long int current_ms; }; void dpif_init(struct dpif *, const struct dpif_class *, const char *name, diff --git a/ofproto/ofproto-dpif-upcall.c b/ofproto/ofproto-dpif-upcall.c index 62222079f..a372d6252 100644 --- a/ofproto/ofproto-dpif-upcall.c +++ b/ofproto/ofproto-dpif-upcall.c @@ -42,6 +42,8 @@ #include "tunnel.h" #include "unixctl.h" #include "openvswitch/vlog.h" +#include "lib/dpif-provider.h" +#include "lib/netdev-provider.h" #define MAX_QUEUE_LENGTH 512 #define UPCALL_MAX_BATCH 64 @@ -304,6 +306,13 @@ struct udpif_key { uint32_t key_recirc_id; /* Non-zero if reference is held by the ukey. */ struct recirc_refs recircs; /* Action recirc IDs with references held. */ + +#define OFFL_REBAL_INTVL_MSEC 3000 /* dynamic offload rebalance freq */ + bool offloaded; /* True if flow is offloaded */ + uint64_t flow_pps_rate; /* Packets-Per-Second rate */ + long long int flow_time; /* last pps update time */ + uint64_t flow_packets; /* #pkts seen in interval */ + uint64_t flow_backlog_packets; /* prev-mode #pkts (offl or kernel) */ }; /* Datapath operation with optional ukey attached. */ @@ -1667,6 +1676,10 @@ ukey_create__(const struct nlattr *key, size_t key_len, ukey->stats.used = used; ukey->xcache = NULL; + ukey->offloaded = false; + ukey->flow_time = 0; + ukey->flow_packets = ukey->flow_backlog_packets = 0; + ukey->key_recirc_id = key_recirc_id; recirc_refs_init(&ukey->recircs); if (xout) { @@ -2442,6 +2455,39 @@ reval_op_init(struct ukey_op *op, enum reval_result result, } } +static uint64_t +udpif_flow_packet_delta(struct udpif_key *ukey, const struct dpif_flow *f) +{ + return f->stats.n_packets + ukey->flow_backlog_packets - + ukey->flow_packets; +} + +static long long int +udpif_flow_time_delta(struct udpif *udpif, struct udpif_key *ukey) +{ + return (udpif->dpif->current_ms - ukey->flow_time) / 1000; +} + +/* Gather pps-rate for the given dpif_flow and save it in its ukey */ +static void +udpif_update_flow_pps(struct udpif *udpif, struct udpif_key *ukey, + const struct dpif_flow *f) +{ + uint64_t pps; + + /* Update pps-rate only when we are close to rebalance interval */ + if (udpif->dpif->current_ms - ukey->flow_time < OFFL_REBAL_INTVL_MSEC) { + return; + } + + ukey->offloaded = f->attrs.offloaded; + pps = udpif_flow_packet_delta(ukey, f) / + udpif_flow_time_delta(udpif, ukey); + ukey->flow_pps_rate = pps; + ukey->flow_packets = ukey->flow_backlog_packets + f->stats.n_packets; + ukey->flow_time = udpif->dpif->current_ms; +} + static void revalidate(struct revalidator *revalidator) { @@ -2550,6 +2596,11 @@ revalidate(struct revalidator *revalidator) } ukey->dump_seq = dump_seq; + if (netdev_is_offload_rebalance_policy_enabled() && + result != UKEY_DELETE) { + udpif_update_flow_pps(udpif, ukey, f); + } + if (result != UKEY_KEEP) { /* Takes ownership of 'recircs'. */ reval_op_init(&ops[n_ops++], result, udpif, ukey, &recircs, From patchwork Thu Sep 27 06:48:27 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li,Rongqing via dev" X-Patchwork-Id: 975551 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=openvswitch.org (client-ip=140.211.169.12; helo=mail.linuxfoundation.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=openvswitch.org Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=broadcom.com header.i=@broadcom.com header.b="GPz9tlQe"; dkim-atps=neutral Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 42LQC86ct1z9s1x for ; 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Wed, 26 Sep 2018 23:38:19 -0700 (PDT) Received: from host-10-123-153-36.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id 64-v6sm1488547wrr.64.2018.09.26.23.38.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Sep 2018 23:38:18 -0700 (PDT) To: dev@openvswitch.org Date: Thu, 27 Sep 2018 12:18:27 +0530 Message-Id: <20180927064827.26256-4-sriharsha.basavapatna@broadcom.com> X-Mailer: git-send-email 2.18.0.rc1.1.g6f333ff In-Reply-To: <20180927064827.26256-1-sriharsha.basavapatna@broadcom.com> References: <20180927064827.26256-1-sriharsha.basavapatna@broadcom.com> X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Subject: [ovs-dev] [PATCH v7 3/3] revalidator: Rebalance offloaded flows based on the pps rate X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Sriharsha Basavapatna via dev From: "Li,Rongqing via dev" Reply-To: Sriharsha Basavapatna MIME-Version: 1.0 Sender: ovs-dev-bounces@openvswitch.org Errors-To: ovs-dev-bounces@openvswitch.org This is the third patch in the patch-set to support dynamic rebalancing of offloaded flows. The dynamic rebalancing functionality is implemented in this patch. The ukeys that are not scheduled for deletion are obtained and passed as input to the rebalancing routine. The rebalancing is done in the context of revalidation leader thread, after all other revalidator threads are done with gathering rebalancing data for flows. For each netdev that is in OOR state, a list of flows - both offloaded and non-offloaded (pending) - is obtained using the ukeys. For each netdev that is in OOR state, the flows are grouped and sorted into offloaded and pending flows. The offloaded flows are sorted in descending order of pps-rate, while pending flows are sorted in ascending order of pps-rate. The rebalancing is done in two phases. In the first phase, we try to offload all pending flows and if that succeeds, the OOR state on the device is cleared. If some (or none) of the pending flows could not be offloaded, then we start replacing an offloaded flow that has a lower pps-rate than a pending flow, until there are no more pending flows with a higher rate than an offloaded flow. The flows that are replaced from the device are added into kernel datapath. A new OVS configuration parameter "offload-rebalance", is added to ovsdb. The default value of this is "false". To enable this feature, set the value of this parameter to "true", which provides packets-per-second rate based policy to dynamically offload and un-offload flows. Note: This option can be enabled only when 'hw-offload' policy is enabled. It also requires 'tc-policy' to be set to 'skip_sw'; otherwise, flow offload errors (specifically ENOSPC error this feature depends on) reported by an offloaded device are supressed by TC-Flower kernel module. Signed-off-by: Sriharsha Basavapatna Co-authored-by: Venkat Duvvuru Signed-off-by: Venkat Duvvuru Reviewed-by: Sathya Perla --- NEWS | 3 + lib/dpif-netdev.c | 3 +- lib/dpif-netlink.c | 29 ++- lib/dpif-provider.h | 8 +- lib/dpif.c | 30 ++- lib/dpif.h | 12 +- lib/netdev-provider.h | 7 +- lib/netdev.c | 62 ++++- lib/netdev.h | 1 + ofproto/ofproto-dpif-upcall.c | 445 +++++++++++++++++++++++++++++++++- vswitchd/vswitch.xml | 21 ++ 11 files changed, 592 insertions(+), 29 deletions(-) diff --git a/NEWS b/NEWS index 33b4d8a23..846b46fb5 100644 --- a/NEWS +++ b/NEWS @@ -8,6 +8,9 @@ Post-v2.10.0 as the default timeout for control utilities. - ovn: * ovn-ctl: allow passing user:group ids to the OVN daemons. + - ovs-vswitchd: + * New configuration option "offload-rebalance", that enables dynamic + rebalancing of offloaded flows. v2.10.0 - xx xxx xxxx diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c index 7c0300cc5..1c01d2278 100644 --- a/lib/dpif-netdev.c +++ b/lib/dpif-netdev.c @@ -3689,7 +3689,8 @@ dpif_netdev_execute(struct dpif *dpif, struct dpif_execute *execute) } static void -dpif_netdev_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops) +dpif_netdev_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops, + enum dpif_offload_type offload_type OVS_UNUSED) { size_t i; diff --git a/lib/dpif-netlink.c b/lib/dpif-netlink.c index b9ce9cbe2..2e01f5750 100644 --- a/lib/dpif-netlink.c +++ b/lib/dpif-netlink.c @@ -2281,7 +2281,8 @@ dpif_netlink_operate_chunks(struct dpif_netlink *dpif, struct dpif_op **ops, } static void -dpif_netlink_operate(struct dpif *dpif_, struct dpif_op **ops, size_t n_ops) +dpif_netlink_operate(struct dpif *dpif_, struct dpif_op **ops, size_t n_ops, + enum dpif_offload_type offload_type) { struct dpif_netlink *dpif = dpif_netlink_cast(dpif_); struct dpif_op *new_ops[OPERATE_MAX_OPS]; @@ -2289,7 +2290,12 @@ dpif_netlink_operate(struct dpif *dpif_, struct dpif_op **ops, size_t n_ops) int i = 0; int err = 0; - if (netdev_is_flow_api_enabled()) { + if (offload_type == DPIF_OFFLOAD_ALWAYS && !netdev_is_flow_api_enabled()) { + VLOG_DBG("Invalid offload_type: %d", offload_type); + return; + } + + if (offload_type != DPIF_OFFLOAD_NEVER && netdev_is_flow_api_enabled()) { while (n_ops > 0) { count = 0; @@ -2298,6 +2304,23 @@ dpif_netlink_operate(struct dpif *dpif_, struct dpif_op **ops, size_t n_ops) err = try_send_to_netdev(dpif, op); if (err && err != EEXIST) { + if (offload_type == DPIF_OFFLOAD_ALWAYS) { + /* We got an error while offloading an op. Since + * OFFLOAD_ALWAYS is specified, we stop further + * processing and return to the caller without + * invoking kernel datapath as fallback. But the + * interface requires us to process all n_ops; so + * return the same error in the remaining ops too. + */ + op->error = err; + n_ops--; + while (n_ops > 0) { + op = ops[i++]; + op->error = err; + n_ops--; + } + return; + } new_ops[count++] = op; } else { op->error = err; @@ -2308,7 +2331,7 @@ dpif_netlink_operate(struct dpif *dpif_, struct dpif_op **ops, size_t n_ops) dpif_netlink_operate_chunks(dpif, new_ops, count); } - } else { + } else if (offload_type != DPIF_OFFLOAD_ALWAYS) { dpif_netlink_operate_chunks(dpif, ops, n_ops); } } diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h index 7a71f5c0a..a30de740f 100644 --- a/lib/dpif-provider.h +++ b/lib/dpif-provider.h @@ -296,12 +296,14 @@ struct dpif_class { int (*flow_dump_next)(struct dpif_flow_dump_thread *thread, struct dpif_flow *flows, int max_flows); - /* Executes each of the 'n_ops' operations in 'ops' on 'dpif', in the order * in which they are specified, placing each operation's results in the * "output" members documented in comments and the 'error' member of each - * dpif_op. */ - void (*operate)(struct dpif *dpif, struct dpif_op **ops, size_t n_ops); + * dpif_op. The offload_type argument tells the provider if 'ops' should + * be submitted to to a netdev (only offload) or to the kernel datapath + * (never offload) or to both (offload if possible; software fallback). */ + void (*operate)(struct dpif *dpif, struct dpif_op **ops, size_t n_ops, + enum dpif_offload_type offload_type); /* Enables or disables receiving packets with dpif_recv() for 'dpif'. * Turning packet receive off and then back on is allowed to change Netlink diff --git a/lib/dpif.c b/lib/dpif.c index d799f972c..65880b86a 100644 --- a/lib/dpif.c +++ b/lib/dpif.c @@ -49,6 +49,7 @@ #include "valgrind.h" #include "openvswitch/ofp-errors.h" #include "openvswitch/vlog.h" +#include "lib/netdev-provider.h" VLOG_DEFINE_THIS_MODULE(dpif); @@ -1015,7 +1016,7 @@ dpif_flow_get(struct dpif *dpif, op.flow_get.flow->key_len = key_len; opp = &op; - dpif_operate(dpif, &opp, 1); + dpif_operate(dpif, &opp, 1, DPIF_OFFLOAD_AUTO); return op.error; } @@ -1045,7 +1046,7 @@ dpif_flow_put(struct dpif *dpif, enum dpif_flow_put_flags flags, op.flow_put.stats = stats; opp = &op; - dpif_operate(dpif, &opp, 1); + dpif_operate(dpif, &opp, 1, DPIF_OFFLOAD_AUTO); return op.error; } @@ -1068,7 +1069,7 @@ dpif_flow_del(struct dpif *dpif, op.flow_del.terse = false; opp = &op; - dpif_operate(dpif, &opp, 1); + dpif_operate(dpif, &opp, 1, DPIF_OFFLOAD_AUTO); return op.error; } @@ -1325,7 +1326,7 @@ dpif_execute(struct dpif *dpif, struct dpif_execute *execute) op.execute = *execute; opp = &op; - dpif_operate(dpif, &opp, 1); + dpif_operate(dpif, &opp, 1, DPIF_OFFLOAD_AUTO); return op.error; } else { @@ -1336,10 +1337,21 @@ dpif_execute(struct dpif *dpif, struct dpif_execute *execute) /* Executes each of the 'n_ops' operations in 'ops' on 'dpif', in the order in * which they are specified. Places each operation's results in the "output" * members documented in comments, and 0 in the 'error' member on success or a - * positive errno on failure. */ + * positive errno on failure. + */ void -dpif_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops) -{ +dpif_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops, + enum dpif_offload_type offload_type) +{ + if (offload_type == DPIF_OFFLOAD_ALWAYS && !netdev_is_flow_api_enabled()) { + size_t i; + for (i = 0; i < n_ops; i++) { + struct dpif_op *op = ops[i]; + op->error = EINVAL; + } + return; + } + while (n_ops > 0) { size_t chunk; @@ -1360,7 +1372,7 @@ dpif_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops) * handle itself, without help. */ size_t i; - dpif->dpif_class->operate(dpif, ops, chunk); + dpif->dpif_class->operate(dpif, ops, chunk, offload_type); for (i = 0; i < chunk; i++) { struct dpif_op *op = ops[i]; @@ -1657,7 +1669,7 @@ dpif_queue_to_priority(const struct dpif *dpif, uint32_t queue_id, log_operation(dpif, "queue_to_priority", error); return error; } - + void dpif_init(struct dpif *dpif, const struct dpif_class *dpif_class, const char *name, diff --git a/lib/dpif.h b/lib/dpif.h index bbdc3eb6c..0675ab19f 100644 --- a/lib/dpif.h +++ b/lib/dpif.h @@ -614,6 +614,13 @@ enum dpif_op_type { DPIF_OP_FLOW_GET, }; +/* offload_type argument types to (*operate) interface */ +enum dpif_offload_type { + DPIF_OFFLOAD_AUTO, /* Offload if possible, fallback to software. */ + DPIF_OFFLOAD_NEVER, /* Never offload to hardware. */ + DPIF_OFFLOAD_ALWAYS, /* Always offload to hardware. */ +}; + /* Add or modify a flow. * * The flow is specified by the Netlink attributes with types OVS_KEY_ATTR_* in @@ -768,8 +775,9 @@ struct dpif_op { }; }; -void dpif_operate(struct dpif *, struct dpif_op **ops, size_t n_ops); - +void dpif_operate(struct dpif *, struct dpif_op **ops, size_t n_ops, + enum dpif_offload_type); + /* Upcalls. */ enum dpif_upcall_type { diff --git a/lib/netdev-provider.h b/lib/netdev-provider.h index e320dad61..fb0c27e6e 100644 --- a/lib/netdev-provider.h +++ b/lib/netdev-provider.h @@ -38,10 +38,14 @@ struct netdev_tnl_build_header_params; /* Offload-capable (HW) netdev information */ struct netdev_hw_info { bool oor; /* Out of Offload Resources ? */ + int offload_count; /* Pending (non-offloaded) flow count */ + int pending_count; /* Offloaded flow count */ }; enum hw_info_type { - HW_INFO_TYPE_OOR = 1 /* OOR state */ + HW_INFO_TYPE_OOR = 1, /* OOR state */ + HW_INFO_TYPE_PEND_COUNT = 2, /* Pending(non-offloaded) flow count */ + HW_INFO_TYPE_OFFL_COUNT = 3 /* Offloaded flow count */ }; /* A network device (e.g. an Ethernet device). @@ -89,7 +93,6 @@ struct netdev { int n_rxq; struct shash_node *node; /* Pointer to element in global map. */ struct ovs_list saved_flags_list; /* Contains "struct netdev_saved_flags". */ - struct netdev_hw_info hw_info; /* offload-capable netdev info */ }; diff --git a/lib/netdev.c b/lib/netdev.c index 3e2ce7c09..5a61bbd2e 100644 --- a/lib/netdev.c +++ b/lib/netdev.c @@ -2260,11 +2260,23 @@ netdev_get_block_id(struct netdev *netdev) int netdev_get_hw_info(struct netdev *netdev, int type) { - if (type == HW_INFO_TYPE_OOR) { - return netdev->hw_info.oor; + int val = -1; + + switch (type) { + case HW_INFO_TYPE_OOR: + val = netdev->hw_info.oor; + break; + case HW_INFO_TYPE_PEND_COUNT: + val = netdev->hw_info.pending_count; + break; + case HW_INFO_TYPE_OFFL_COUNT: + val = netdev->hw_info.offload_count; + break; + default: + break; } - return -1; + return val; } /* @@ -2273,9 +2285,47 @@ netdev_get_hw_info(struct netdev *netdev, int type) void netdev_set_hw_info(struct netdev *netdev, int type, int val) { - if (type == HW_INFO_TYPE_OOR) { + switch (type) { + case HW_INFO_TYPE_OOR: + if (val == 0) { + VLOG_DBG("Offload rebalance: netdev: %s is not OOR", netdev->name); + } netdev->hw_info.oor = val; + break; + case HW_INFO_TYPE_PEND_COUNT: + netdev->hw_info.pending_count = val; + break; + case HW_INFO_TYPE_OFFL_COUNT: + netdev->hw_info.offload_count = val; + break; + default: + break; + } +} + +/* + * Find if any netdev is in OOR state. Return true if there's at least + * one netdev that's in OOR state; otherwise return false. + */ +bool +netdev_any_oor(void) + OVS_EXCLUDED(netdev_mutex) +{ + struct shash_node *node; + bool oor = false; + + ovs_mutex_lock(&netdev_mutex); + SHASH_FOR_EACH (node, &netdev_shash) { + struct netdev *dev = node->data; + + if (dev->hw_info.oor) { + oor = true; + break; + } } + ovs_mutex_unlock(&netdev_mutex); + + return oor; } bool @@ -2550,6 +2600,10 @@ netdev_set_flow_api_enabled(const struct smap *ovs_other_config) tc_set_policy(smap_get_def(ovs_other_config, "tc-policy", TC_POLICY_DEFAULT)); + if (smap_get_bool(ovs_other_config, "offload-rebalance", false)) { + netdev_offload_rebalance_policy = true; + } + netdev_ports_flow_init(); ovsthread_once_done(&once); diff --git a/lib/netdev.h b/lib/netdev.h index b0e5c5b72..373be7cc0 100644 --- a/lib/netdev.h +++ b/lib/netdev.h @@ -229,6 +229,7 @@ int netdev_init_flow_api(struct netdev *); uint32_t netdev_get_block_id(struct netdev *); int netdev_get_hw_info(struct netdev *, int); void netdev_set_hw_info(struct netdev *, int, int); +bool netdev_any_oor(void); bool netdev_is_flow_api_enabled(void); void netdev_set_flow_api_enabled(const struct smap *ovs_other_config); bool netdev_is_offload_rebalance_policy_enabled(void); diff --git a/ofproto/ofproto-dpif-upcall.c b/ofproto/ofproto-dpif-upcall.c index a372d6252..6e5c37e97 100644 --- a/ofproto/ofproto-dpif-upcall.c +++ b/ofproto/ofproto-dpif-upcall.c @@ -22,6 +22,7 @@ #include "connmgr.h" #include "coverage.h" #include "cmap.h" +#include "lib/dpif-provider.h" #include "dpif.h" #include "openvswitch/dynamic-string.h" #include "fail-open.h" @@ -42,7 +43,6 @@ #include "tunnel.h" #include "unixctl.h" #include "openvswitch/vlog.h" -#include "lib/dpif-provider.h" #include "lib/netdev-provider.h" #define MAX_QUEUE_LENGTH 512 @@ -182,6 +182,8 @@ struct udpif { uint64_t conn_seq; /* Corresponds to 'dump_seq' when conns[n_conns-1] was stored. */ size_t n_conns; /* Number of connections waiting. */ + + long long int offload_rebalance_time; /* Time of last offload rebalance */ }; enum upcall_type { @@ -308,6 +310,7 @@ struct udpif_key { struct recirc_refs recircs; /* Action recirc IDs with references held. */ #define OFFL_REBAL_INTVL_MSEC 3000 /* dynamic offload rebalance freq */ + struct netdev *in_netdev; /* in_odp_port's netdev */ bool offloaded; /* True if flow is offloaded */ uint64_t flow_pps_rate; /* Packets-Per-Second rate */ long long int flow_time; /* last pps update time */ @@ -396,6 +399,12 @@ static int upcall_receive(struct upcall *, const struct dpif_backer *, const ovs_u128 *ufid, const unsigned pmd_id); static void upcall_uninit(struct upcall *); +static void udpif_flow_rebalance(struct udpif *udpif); +static int udpif_flow_program(struct udpif *udpif, struct udpif_key *ukey, + enum dpif_offload_type offload_type); +static int udpif_flow_unprogram(struct udpif *udpif, struct udpif_key *ukey, + enum dpif_offload_type offload_type); + static upcall_callback upcall_cb; static dp_purge_callback dp_purge_cb; @@ -567,6 +576,7 @@ udpif_start_threads(struct udpif *udpif, size_t n_handlers_, ovs_barrier_init(&udpif->pause_barrier, udpif->n_revalidators + 1); udpif->reval_exit = false; udpif->pause = false; + udpif->offload_rebalance_time = time_msec(); udpif->revalidators = xzalloc(udpif->n_revalidators * sizeof *udpif->revalidators); for (size_t i = 0; i < udpif->n_revalidators; i++) { @@ -859,6 +869,26 @@ free_dupcall: return n_upcalls; } +static void +udpif_run_flow_rebalance(struct udpif *udpif) +{ + long long int now = 0; + + /* Don't rebalance if OFFL_REBAL_INTVL_MSEC have not elapsed */ + now = time_msec(); + if (now < udpif->offload_rebalance_time + OFFL_REBAL_INTVL_MSEC) { + return; + } + + if (!netdev_any_oor()) { + return; + } + + VLOG_DBG("Offload rebalance: Found OOR netdevs"); + udpif->offload_rebalance_time = now; + udpif_flow_rebalance(udpif); +} + static void * udpif_revalidator(void *arg) { @@ -933,6 +963,9 @@ udpif_revalidator(void *arg) dpif_flow_dump_destroy(udpif->dump); seq_change(udpif->dump_seq); + if (netdev_is_offload_rebalance_policy_enabled()) { + udpif_run_flow_rebalance(udpif); + } duration = MAX(time_msec() - start_time, 1); udpif->dump_duration = duration; @@ -977,7 +1010,7 @@ udpif_revalidator(void *arg) return NULL; } - + static enum upcall_type classify_upcall(enum dpif_upcall_type type, const struct nlattr *userdata, struct user_action_cookie *cookie) @@ -1579,7 +1612,7 @@ handle_upcalls(struct udpif *udpif, struct upcall *upcalls, for (i = 0; i < n_ops; i++) { opsp[n_opsp++] = &ops[i].dop; } - dpif_operate(udpif->dpif, opsp, n_opsp); + dpif_operate(udpif->dpif, opsp, n_opsp, DPIF_OFFLOAD_AUTO); for (i = 0; i < n_ops; i++) { struct udpif_key *ukey = ops[i].ukey; @@ -1671,13 +1704,14 @@ ukey_create__(const struct nlattr *key, size_t key_len, ukey->state = UKEY_CREATED; ukey->state_thread = ovsthread_id_self(); ukey->state_where = OVS_SOURCE_LOCATOR; - ukey->created = time_msec(); + ukey->created = ukey->flow_time = time_msec(); memset(&ukey->stats, 0, sizeof ukey->stats); ukey->stats.used = used; ukey->xcache = NULL; ukey->offloaded = false; ukey->flow_time = 0; + ukey->in_netdev = NULL; ukey->flow_packets = ukey->flow_backlog_packets = 0; ukey->key_recirc_id = key_recirc_id; @@ -2329,7 +2363,7 @@ push_dp_ops(struct udpif *udpif, struct ukey_op *ops, size_t n_ops) for (i = 0; i < n_ops; i++) { opsp[i] = &ops[i].dop; } - dpif_operate(udpif->dpif, opsp, n_ops); + dpif_operate(udpif->dpif, opsp, n_ops, DPIF_OFFLOAD_AUTO); for (i = 0; i < n_ops; i++) { struct ukey_op *op = &ops[i]; @@ -2455,6 +2489,57 @@ reval_op_init(struct ukey_op *op, enum reval_result result, } } +static void +ukey_netdev_unref(struct udpif_key *ukey) +{ + if (!ukey->in_netdev) { + return; + } + netdev_close(ukey->in_netdev); + ukey->in_netdev = NULL; +} + +/* + * Given a udpif_key, get its input port (netdev) by parsing the flow keys + * and actions. The flow may not contain flow attributes if it is a terse + * dump; read its attributes from the ukey and then parse the flow to get + * the port info. Save them in udpif_key. + */ +static void +ukey_to_flow_netdev(struct udpif *udpif, struct udpif_key *ukey) +{ + const struct dpif *dpif = udpif->dpif; + const struct dpif_class *dpif_class = dpif->dpif_class; + const struct nlattr *k; + unsigned int left; + + /* Remove existing references to netdev */ + ukey_netdev_unref(ukey); + + /* Find the input port and get a reference to its netdev */ + NL_ATTR_FOR_EACH (k, left, ukey->key, ukey->key_len) { + enum ovs_key_attr type = nl_attr_type(k); + + if (type == OVS_KEY_ATTR_IN_PORT) { + ukey->in_netdev = netdev_ports_get(nl_attr_get_odp_port(k), + dpif_class); + } else if (type == OVS_KEY_ATTR_TUNNEL) { + struct flow_tnl tnl; + enum odp_key_fitness res; + + if (ukey->in_netdev) { + netdev_close(ukey->in_netdev); + ukey->in_netdev = NULL; + } + res = odp_tun_key_from_attr(k, &tnl); + if (res != ODP_FIT_ERROR) { + ukey->in_netdev = flow_get_tunnel_netdev(&tnl); + break; + } + } + } +} + static uint64_t udpif_flow_packet_delta(struct udpif_key *ukey, const struct dpif_flow *f) { @@ -2468,6 +2553,16 @@ udpif_flow_time_delta(struct udpif *udpif, struct udpif_key *ukey) return (udpif->dpif->current_ms - ukey->flow_time) / 1000; } +/* + * Save backlog packet count while switching modes + * between offloaded and kernel datapaths. + */ +static void +udpif_set_ukey_backlog_packets(struct udpif_key *ukey) +{ + ukey->flow_backlog_packets = ukey->flow_packets; +} + /* Gather pps-rate for the given dpif_flow and save it in its ukey */ static void udpif_update_flow_pps(struct udpif *udpif, struct udpif_key *ukey, @@ -2539,6 +2634,7 @@ revalidate(struct revalidator *revalidator) kill_them_all = n_dp_flows > flow_limit * 2; max_idle = n_dp_flows > flow_limit ? 100 : ofproto_max_idle; + udpif->dpif->current_ms = time_msec(); for (f = flows; f < &flows[n_dumped]; f++) { long long int used = f->stats.used; struct recirc_refs recircs = RECIRC_REFS_EMPTY_INITIALIZER; @@ -2915,3 +3011,342 @@ upcall_unixctl_purge(struct unixctl_conn *conn, int argc OVS_UNUSED, } unixctl_command_reply(conn, ""); } + +/* Flows are sorted in the following order: + * netdev, flow state (offloaded/kernel path), flow_pps_rate. + */ +static int +flow_compare_rebalance(const void *elem1, const void *elem2) +{ + const struct udpif_key *f1 = *(struct udpif_key **)elem1; + const struct udpif_key *f2 = *(struct udpif_key **)elem2; + int64_t diff; + + if (f1->in_netdev < f2->in_netdev) { + return -1; + } else if (f1->in_netdev > f2->in_netdev) { + return 1; + } + + if (f1->offloaded != f2->offloaded) { + return f2->offloaded - f1->offloaded; + } + + diff = (f1->offloaded == true) ? + f1->flow_pps_rate - f2->flow_pps_rate : + f2->flow_pps_rate - f1->flow_pps_rate; + + return (diff < 0) ? -1 : 1; +} + +/* Insert flows from pending array during rebalancing */ +static int +rebalance_insert_pending(struct udpif *udpif, struct udpif_key **pending_flows, + int pending_count, int insert_count, + uint64_t rate_threshold) +{ + int count = 0; + + for (int i = 0; i < pending_count; i++) { + struct udpif_key *flow = pending_flows[i]; + int err; + + /* Stop offloading pending flows if the insert count is + * reached and the flow rate is less than the threshold + */ + if (count >= insert_count && flow->flow_pps_rate < rate_threshold) { + break; + } + + /* Offload the flow to netdev */ + err = udpif_flow_program(udpif, flow, DPIF_OFFLOAD_ALWAYS); + + if (err == ENOSPC) { + /* Stop if we are out of resources */ + break; + } + + if (err) { + continue; + } + + /* Offload succeeded; delete it from the kernel datapath */ + udpif_flow_unprogram(udpif, flow, DPIF_OFFLOAD_NEVER); + + /* Change the state of the flow, adjust dpif counters */ + flow->offloaded = true; + + udpif_set_ukey_backlog_packets(flow); + count++; + } + + return count; +} + +/* Remove flows from offloaded array during rebalancing */ +static void +rebalance_remove_offloaded(struct udpif *udpif, + struct udpif_key **offloaded_flows, + int offload_count) +{ + for (int i = 0; i < offload_count; i++) { + struct udpif_key *flow = offloaded_flows[i]; + int err; + + /* Install the flow into kernel path first */ + err = udpif_flow_program(udpif, flow, DPIF_OFFLOAD_NEVER); + if (err) { + continue; + } + + /* Success; now remove offloaded flow from netdev */ + err = udpif_flow_unprogram(udpif, flow, DPIF_OFFLOAD_ALWAYS); + if (err) { + udpif_flow_unprogram(udpif, flow, DPIF_OFFLOAD_NEVER); + continue; + } + udpif_set_ukey_backlog_packets(flow); + flow->offloaded = false; + } +} + +/* + * Rebalance offloaded flows on a netdev that's in OOR state. + * + * The rebalancing is done in two phases. In the first phase, we check if + * the pending flows can be offloaded (if some resources became available + * in the meantime) by trying to offload each pending flow. If all pending + * flows get successfully offloaded, the OOR state is cleared on the netdev + * and there's nothing to rebalance. + * + * If some of the pending flows could not be offloaded, i.e, we still see + * the OOR error, then we move to the second phase of rebalancing. In this + * phase, the rebalancer compares pps-rate of an offloaded flow with the + * least pps-rate with that of a pending flow with the highest pps-rate from + * their respective sorted arrays. If pps-rate of the offloaded flow is less + * than the pps-rate of the pending flow, then it deletes the offloaded flow + * from the HW/netdev and adds it to kernel datapath and then offloads pending + * to HW/netdev. This process is repeated for every pair of offloaded and + * pending flows in the ordered list. The process stops when we encounter an + * offloaded flow that has a higher pps-rate than the corresponding pending + * flow. The entire rebalancing process is repeated in the next iteration. + */ +static bool +rebalance_device(struct udpif *udpif, struct udpif_key **offloaded_flows, + int offload_count, struct udpif_key **pending_flows, + int pending_count) +{ + + /* Phase 1 */ + int num_inserted = rebalance_insert_pending(udpif, pending_flows, + pending_count, pending_count, + 0); + if (num_inserted) { + VLOG_DBG("Offload rebalance: Phase1: inserted %d pending flows", + num_inserted); + } + + /* Adjust pending array */ + pending_flows = &pending_flows[num_inserted]; + pending_count -= num_inserted; + + if (!pending_count) { + /* + * Successfully offloaded all pending flows. The device + * is no longer in OOR state; done rebalancing this device. + */ + return false; + } + + /* + * Phase 2; determine how many offloaded flows to churn. + */ +#define OFFL_REBAL_MAX_CHURN 1024 + int churn_count = 0; + while (churn_count < OFFL_REBAL_MAX_CHURN && churn_count < offload_count + && churn_count < pending_count) { + if (pending_flows[churn_count]->flow_pps_rate <= + offloaded_flows[churn_count]->flow_pps_rate) + break; + churn_count++; + } + + if (churn_count) { + VLOG_DBG("Offload rebalance: Phase2: removing %d offloaded flows", + churn_count); + } + + /* Bail early if nothing to churn */ + if (!churn_count) { + return true; + } + + /* Remove offloaded flows */ + rebalance_remove_offloaded(udpif, offloaded_flows, churn_count); + + /* Adjust offloaded array */ + offloaded_flows = &offloaded_flows[churn_count]; + offload_count -= churn_count; + + /* Replace offloaded flows with pending flows */ + num_inserted = rebalance_insert_pending(udpif, pending_flows, + pending_count, churn_count, + offload_count ? + offloaded_flows[0]->flow_pps_rate : + 0); + if (num_inserted) { + VLOG_DBG("Offload rebalance: Phase2: inserted %d pending flows", + num_inserted); + } + + return true; +} + +static struct udpif_key ** +udpif_add_oor_flows(struct udpif_key **sort_flows, size_t *total_flow_count, + size_t *alloc_flow_count, struct udpif_key *ukey) +{ + if (*total_flow_count >= *alloc_flow_count) { + sort_flows = x2nrealloc(sort_flows, alloc_flow_count, sizeof ukey); + } + sort_flows[(*total_flow_count)++] = ukey; + return sort_flows; +} + +/* + * Build sort_flows[] initially with flows that + * reference an 'OOR' netdev as their input port. + */ +static struct udpif_key ** +udpif_build_oor_flows(struct udpif_key **sort_flows, size_t *total_flow_count, + size_t *alloc_flow_count, struct udpif_key *ukey, + int *oor_netdev_count) +{ + struct netdev *netdev; + int count; + + /* Input netdev must be available for the flow */ + netdev = ukey->in_netdev; + if (!netdev) { + return sort_flows; + } + + /* Is the in-netdev for this flow in OOR state ? */ + if (!netdev_get_hw_info(netdev, HW_INFO_TYPE_OOR)) { + ukey_netdev_unref(ukey); + return sort_flows; + } + + /* Add the flow to sort_flows[] */ + sort_flows = udpif_add_oor_flows(sort_flows, total_flow_count, + alloc_flow_count, ukey); + if (ukey->offloaded) { + count = netdev_get_hw_info(netdev, HW_INFO_TYPE_OFFL_COUNT); + ovs_assert(count >= 0); + if (count++ == 0) { + (*oor_netdev_count)++; + } + netdev_set_hw_info(netdev, HW_INFO_TYPE_OFFL_COUNT, count); + } else { + count = netdev_get_hw_info(netdev, HW_INFO_TYPE_PEND_COUNT); + ovs_assert(count >= 0); + netdev_set_hw_info(netdev, HW_INFO_TYPE_PEND_COUNT, ++count); + } + + return sort_flows; +} + +/* + * Rebalance offloaded flows on HW netdevs that are in OOR state. + */ +static void +udpif_flow_rebalance(struct udpif *udpif) +{ + struct udpif_key **sort_flows = NULL; + size_t alloc_flow_count = 0; + size_t total_flow_count = 0; + int oor_netdev_count = 0; + int offload_index = 0; + int pending_index; + + /* Collect flows (offloaded and pending) that reference OOR netdevs */ + for (size_t i = 0; i < N_UMAPS; i++) { + struct udpif_key *ukey; + struct umap *umap = &udpif->ukeys[i]; + + CMAP_FOR_EACH (ukey, cmap_node, &umap->cmap) { + ukey_to_flow_netdev(udpif, ukey); + sort_flows = udpif_build_oor_flows(sort_flows, &total_flow_count, + &alloc_flow_count, ukey, + &oor_netdev_count); + } + } + + /* Sort flows by OOR netdevs, state (offloaded/pending) and pps-rate */ + qsort(sort_flows, total_flow_count, sizeof(struct udpif_key *), + flow_compare_rebalance); + + /* + * We now have flows referencing OOR netdevs, that are sorted. We also + * have a count of offloaded and pending flows on each of the netdevs + * that are in OOR state. Now rebalance each oor-netdev. + */ + while (oor_netdev_count) { + struct netdev *netdev; + int offload_count; + int pending_count; + bool oor; + + netdev = sort_flows[offload_index]->in_netdev; + ovs_assert(netdev_get_hw_info(netdev, HW_INFO_TYPE_OOR) == true); + VLOG_DBG("Offload rebalance: netdev: %s is OOR", netdev->name); + + offload_count = netdev_get_hw_info(netdev, HW_INFO_TYPE_OFFL_COUNT); + pending_count = netdev_get_hw_info(netdev, HW_INFO_TYPE_PEND_COUNT); + pending_index = offload_index + offload_count; + + oor = rebalance_device(udpif, + &sort_flows[offload_index], offload_count, + &sort_flows[pending_index], pending_count); + netdev_set_hw_info(netdev, HW_INFO_TYPE_OOR, oor); + + offload_index = pending_index + pending_count; + netdev_set_hw_info(netdev, HW_INFO_TYPE_OFFL_COUNT, 0); + netdev_set_hw_info(netdev, HW_INFO_TYPE_PEND_COUNT, 0); + oor_netdev_count--; + } + + for (int i = 0; i < total_flow_count; i++) { + struct udpif_key *ukey = sort_flows[i]; + ukey_netdev_unref(ukey); + } + free(sort_flows); +} + +static int +udpif_flow_program(struct udpif *udpif, struct udpif_key *ukey, + enum dpif_offload_type offload_type) +{ + struct dpif_op *opsp; + struct ukey_op uop; + + opsp = &uop.dop; + put_op_init(&uop, ukey, DPIF_FP_CREATE); + dpif_operate(udpif->dpif, &opsp, 1, offload_type); + + return opsp->error; +} + +static int +udpif_flow_unprogram(struct udpif *udpif, struct udpif_key *ukey, + enum dpif_offload_type offload_type) +{ + struct dpif_op *opsp; + struct ukey_op uop; + + opsp = &uop.dop; + delete_op_init(udpif, &uop, ukey); + dpif_operate(udpif->dpif, &opsp, 1, offload_type); + + return opsp->error; +} diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml index f05f616fe..2bfe4ff24 100644 --- a/vswitchd/vswitch.xml +++ b/vswitchd/vswitch.xml @@ -519,6 +519,27 @@

+ +

+ Configures HW offload rebalancing, that allows to dynamically + offload and un-offload flows while an offload-device is out of + resources (OOR). This policy allows flows to be selected for + offloading based on the packets-per-second (pps) rate of flows. +

+

+ Set this value to true to enable this option. +

+

+ The default value is false. Changing this value requires + restarting the daemon. +

+

+ This is only relevant if HW offloading is enabled (hw-offload). + When this policy is enabled, it also requires 'tc-policy' to + be set to 'skip_sw'. +

+