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Mon, 3 Jun 2024 18:56:58 +0000 (UTC) Received: from antares.redhat.com (unknown [10.39.193.112]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 3A0AF190DB3B; Mon, 3 Jun 2024 18:56:52 +0000 (UTC) From: Adrian Moreno To: netdev@vger.kernel.org Date: Mon, 3 Jun 2024 20:56:35 +0200 Message-ID: <20240603185647.2310748-2-amorenoz@redhat.com> In-Reply-To: <20240603185647.2310748-1-amorenoz@redhat.com> References: <20240603185647.2310748-1-amorenoz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Cc: dev@openvswitch.org, Paolo Abeni , Yotam Gigi , i.maximets@ovn.org, linux-kernel@vger.kernel.org, Eric Dumazet , horms@kernel.org, Jakub Kicinski , "David S. Miller" Subject: [ovs-dev] [PATCH net-next v2 1/9] net: psample: add user cookie X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" Add a user cookie to the sample metadata so that sample emitters can provide more contextual information to samples. If present, send the user cookie in a new attribute: PSAMPLE_ATTR_USER_COOKIE. Signed-off-by: Adrian Moreno Reviewed-by: Simon Horman --- include/net/psample.h | 2 ++ include/uapi/linux/psample.h | 1 + net/psample/psample.c | 9 ++++++++- 3 files changed, 11 insertions(+), 1 deletion(-) diff --git a/include/net/psample.h b/include/net/psample.h index 0509d2d6be67..2ac71260a546 100644 --- a/include/net/psample.h +++ b/include/net/psample.h @@ -25,6 +25,8 @@ struct psample_metadata { out_tc_occ_valid:1, latency_valid:1, unused:5; + const u8 *user_cookie; + u32 user_cookie_len; }; struct psample_group *psample_group_get(struct net *net, u32 group_num); diff --git a/include/uapi/linux/psample.h b/include/uapi/linux/psample.h index e585db5bf2d2..e80637e1d97b 100644 --- a/include/uapi/linux/psample.h +++ b/include/uapi/linux/psample.h @@ -19,6 +19,7 @@ enum { PSAMPLE_ATTR_LATENCY, /* u64, nanoseconds */ PSAMPLE_ATTR_TIMESTAMP, /* u64, nanoseconds */ PSAMPLE_ATTR_PROTO, /* u16 */ + PSAMPLE_ATTR_USER_COOKIE, /* binary, user provided data */ __PSAMPLE_ATTR_MAX }; diff --git a/net/psample/psample.c b/net/psample/psample.c index a5d9b8446f77..b37488f426bc 100644 --- a/net/psample/psample.c +++ b/net/psample/psample.c @@ -386,7 +386,9 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb, nla_total_size(sizeof(u32)) + /* group_num */ nla_total_size(sizeof(u32)) + /* seq */ nla_total_size_64bit(sizeof(u64)) + /* timestamp */ - nla_total_size(sizeof(u16)); /* protocol */ + nla_total_size(sizeof(u16)) + /* protocol */ + (md->user_cookie_len ? + nla_total_size(md->user_cookie_len) : 0); /* user cookie */ #ifdef CONFIG_INET tun_info = skb_tunnel_info(skb); @@ -486,6 +488,11 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb, } #endif + if (md->user_cookie && md->user_cookie_len && + nla_put(nl_skb, PSAMPLE_ATTR_USER_COOKIE, md->user_cookie_len, + md->user_cookie)) + goto error; + genlmsg_end(nl_skb, data); genlmsg_multicast_netns(&psample_nl_family, group->net, nl_skb, 0, PSAMPLE_NL_MCGRP_SAMPLE, GFP_ATOMIC); From patchwork Mon Jun 3 18:56:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Adri=C3=A1n_Moreno?= X-Patchwork-Id: 1943006 X-Patchwork-Delegate: horms@verge.net.au Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; 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Mon, 3 Jun 2024 18:57:13 +0000 (UTC) Received: from antares.redhat.com (unknown [10.39.193.112]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id C073418B916A; Mon, 3 Jun 2024 18:56:58 +0000 (UTC) From: Adrian Moreno To: netdev@vger.kernel.org Date: Mon, 3 Jun 2024 20:56:36 +0200 Message-ID: <20240603185647.2310748-3-amorenoz@redhat.com> In-Reply-To: <20240603185647.2310748-1-amorenoz@redhat.com> References: <20240603185647.2310748-1-amorenoz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Cc: dev@openvswitch.org, Paolo Abeni , Jiri Pirko , Jamal Hadi Salim , i.maximets@ovn.org, linux-kernel@vger.kernel.org, Eric Dumazet , horms@kernel.org, Jakub Kicinski , Cong Wang , "David S. Miller" Subject: [ovs-dev] [PATCH net-next v2 2/9] net: sched: act_sample: add action cookie to sample X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" If the action has a user_cookie, pass it along to the sample so it can be easily identified. Signed-off-by: Adrian Moreno Reviewed-by: Simon Horman --- net/sched/act_sample.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c index a69b53d54039..5c3f86ec964a 100644 --- a/net/sched/act_sample.c +++ b/net/sched/act_sample.c @@ -165,9 +165,11 @@ TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { + u8 cookie_data[TC_COOKIE_MAX_SIZE] = {}; struct tcf_sample *s = to_sample(a); struct psample_group *psample_group; struct psample_metadata md = {}; + struct tc_cookie *user_cookie; int retval; tcf_lastuse_update(&s->tcf_tm); @@ -189,6 +191,16 @@ TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb, if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev)) skb_push(skb, skb->mac_len); + rcu_read_lock(); + user_cookie = rcu_dereference(a->user_cookie); + if (user_cookie) { + memcpy(cookie_data, user_cookie->data, + user_cookie->len); + md.user_cookie = cookie_data; + md.user_cookie_len = user_cookie->len; + } + rcu_read_unlock(); + md.trunc_size = s->truncate ? s->trunc_size : skb->len; psample_sample_packet(psample_group, skb, s->rate, &md); From patchwork Mon Jun 3 18:56:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Adri=C3=A1n_Moreno?= X-Patchwork-Id: 1943007 X-Patchwork-Delegate: horms@verge.net.au Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=WfL/+eHo; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org (client-ip=140.211.166.133; helo=smtp2.osuosl.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=patchwork.ozlabs.org) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4VtNJj66Vcz20Q1 for ; 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Mon, 03 Jun 2024 14:57:20 -0400 X-MC-Unique: yJC5n1d4MP23gZgdSGrKzQ-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5DD5318BF6C6; Mon, 3 Jun 2024 18:57:18 +0000 (UTC) Received: from antares.redhat.com (unknown [10.39.193.112]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 6521D1955F6E; Mon, 3 Jun 2024 18:57:14 +0000 (UTC) From: Adrian Moreno To: netdev@vger.kernel.org Date: Mon, 3 Jun 2024 20:56:37 +0200 Message-ID: <20240603185647.2310748-4-amorenoz@redhat.com> In-Reply-To: <20240603185647.2310748-1-amorenoz@redhat.com> References: <20240603185647.2310748-1-amorenoz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Cc: dev@openvswitch.org, Paolo Abeni , Yotam Gigi , i.maximets@ovn.org, linux-kernel@vger.kernel.org, Eric Dumazet , horms@kernel.org, Jakub Kicinski , "David S. Miller" Subject: [ovs-dev] [PATCH net-next v2 3/9] net: psample: skip packet copy if no listeners X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" If nobody is listening on the multicast group, generating the sample, which involves copying packet data, seems completely unnecessary. Return fast in this case. Signed-off-by: Adrian Moreno Reviewed-by: Simon Horman --- net/psample/psample.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/psample/psample.c b/net/psample/psample.c index b37488f426bc..1c76f3e48dcd 100644 --- a/net/psample/psample.c +++ b/net/psample/psample.c @@ -376,6 +376,10 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb, void *data; int ret; + if (!genl_has_listeners(&psample_nl_family, group->net, + PSAMPLE_NL_MCGRP_SAMPLE)) + return; + meta_len = (in_ifindex ? nla_total_size(sizeof(u16)) : 0) + (out_ifindex ? nla_total_size(sizeof(u16)) : 0) + (md->out_tc_valid ? nla_total_size(sizeof(u16)) : 0) + From patchwork Mon Jun 3 18:56:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Adri=C3=A1n_Moreno?= X-Patchwork-Id: 1943009 X-Patchwork-Delegate: horms@verge.net.au Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; 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Mon, 3 Jun 2024 18:57:24 +0000 (UTC) Received: from antares.redhat.com (unknown [10.39.193.112]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2B24F1955F6E; Mon, 3 Jun 2024 18:57:18 +0000 (UTC) From: Adrian Moreno To: netdev@vger.kernel.org Date: Mon, 3 Jun 2024 20:56:38 +0200 Message-ID: <20240603185647.2310748-5-amorenoz@redhat.com> In-Reply-To: <20240603185647.2310748-1-amorenoz@redhat.com> References: <20240603185647.2310748-1-amorenoz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Cc: dev@openvswitch.org, Paolo Abeni , Jiri Pirko , linux-kernel@vger.kernel.org, Yotam Gigi , i.maximets@ovn.org, Jamal Hadi Salim , Eric Dumazet , horms@kernel.org, Cong Wang , Jakub Kicinski , "David S. Miller" Subject: [ovs-dev] [PATCH net-next v2 4/9] net: psample: allow using rate as probability X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" Although not explicitly documented in the psample module itself, the definition of PSAMPLE_ATTR_SAMPLE_RATE seems inherited from act_sample. Quoting tc-sample(8): "RATE of 100 will lead to an average of one sampled packet out of every 100 observed." With this semantics, the rates that we can express with an unsigned 32-bits number are very unevenly distributed and concentrated towards "sampling few packets". For example, we can express a probability of 2.32E-8% but we cannot express anything between 100% and 50%. For sampling applications that are capable of sampling a decent amount of packets, this sampling rate semantics is not very useful. Add a new flag to the uAPI that indicates that the sampling rate is expressed in scaled probability, this is: - 0 is 0% probability, no packets get sampled. - U32_MAX is 100% probability, all packets get sampled. Signed-off-by: Adrian Moreno --- include/net/psample.h | 3 ++- include/uapi/linux/psample.h | 4 ++++ include/uapi/linux/tc_act/tc_sample.h | 1 + net/psample/psample.c | 3 +++ 4 files changed, 10 insertions(+), 1 deletion(-) diff --git a/include/net/psample.h b/include/net/psample.h index 2ac71260a546..c52e9ebd88dd 100644 --- a/include/net/psample.h +++ b/include/net/psample.h @@ -24,7 +24,8 @@ struct psample_metadata { u8 out_tc_valid:1, out_tc_occ_valid:1, latency_valid:1, - unused:5; + rate_as_probability:1, + unused:4; const u8 *user_cookie; u32 user_cookie_len; }; diff --git a/include/uapi/linux/psample.h b/include/uapi/linux/psample.h index e80637e1d97b..8b069e75beab 100644 --- a/include/uapi/linux/psample.h +++ b/include/uapi/linux/psample.h @@ -20,6 +20,10 @@ enum { PSAMPLE_ATTR_TIMESTAMP, /* u64, nanoseconds */ PSAMPLE_ATTR_PROTO, /* u16 */ PSAMPLE_ATTR_USER_COOKIE, /* binary, user provided data */ + PSAMPLE_ATTR_SAMPLE_PROBABILITY,/* no argument, interpret rate in + * PSAMPLE_ATTR_SAMPLE_RATE as a + * probability scaled 0 - U32_MAX. + */ __PSAMPLE_ATTR_MAX }; diff --git a/include/uapi/linux/tc_act/tc_sample.h b/include/uapi/linux/tc_act/tc_sample.h index fee1bcc20793..7ee0735e7b38 100644 --- a/include/uapi/linux/tc_act/tc_sample.h +++ b/include/uapi/linux/tc_act/tc_sample.h @@ -18,6 +18,7 @@ enum { TCA_SAMPLE_TRUNC_SIZE, TCA_SAMPLE_PSAMPLE_GROUP, TCA_SAMPLE_PAD, + TCA_SAMPLE_PROBABILITY, __TCA_SAMPLE_MAX }; #define TCA_SAMPLE_MAX (__TCA_SAMPLE_MAX - 1) diff --git a/net/psample/psample.c b/net/psample/psample.c index 1c76f3e48dcd..f48b5b9cd409 100644 --- a/net/psample/psample.c +++ b/net/psample/psample.c @@ -497,6 +497,9 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb, md->user_cookie)) goto error; + if (md->rate_as_probability) + nla_put_flag(skb, PSAMPLE_ATTR_SAMPLE_PROBABILITY); + genlmsg_end(nl_skb, data); genlmsg_multicast_netns(&psample_nl_family, group->net, nl_skb, 0, PSAMPLE_NL_MCGRP_SAMPLE, GFP_ATOMIC); From patchwork Mon Jun 3 18:56:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Adri=C3=A1n_Moreno?= X-Patchwork-Id: 1943008 X-Patchwork-Delegate: horms@verge.net.au Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; 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Mon, 3 Jun 2024 18:57:30 +0000 (UTC) Received: from antares.redhat.com (unknown [10.39.193.112]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2E7671955F6E; Mon, 3 Jun 2024 18:57:25 +0000 (UTC) From: Adrian Moreno To: netdev@vger.kernel.org Date: Mon, 3 Jun 2024 20:56:39 +0200 Message-ID: <20240603185647.2310748-6-amorenoz@redhat.com> In-Reply-To: <20240603185647.2310748-1-amorenoz@redhat.com> References: <20240603185647.2310748-1-amorenoz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Cc: dev@openvswitch.org, Paolo Abeni , Donald Hunter , linux-kernel@vger.kernel.org, i.maximets@ovn.org, Eric Dumazet , horms@kernel.org, Jakub Kicinski , "David S. Miller" Subject: [ovs-dev] [PATCH net-next v2 5/9] net: openvswitch: add emit_sample action X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" Add support for a new action: emit_sample. This action accepts a u32 group id and a variable-length cookie and uses the psample multicast group to make the packet available for observability. The maximum length of the user-defined cookie is set to 16, same as tc_cookie, to discourage using cookies that will not be offloadable. Signed-off-by: Adrian Moreno --- Documentation/netlink/specs/ovs_flow.yaml | 17 ++++++++ include/uapi/linux/openvswitch.h | 25 ++++++++++++ net/openvswitch/actions.c | 50 +++++++++++++++++++++++ net/openvswitch/flow_netlink.c | 33 ++++++++++++++- 4 files changed, 124 insertions(+), 1 deletion(-) diff --git a/Documentation/netlink/specs/ovs_flow.yaml b/Documentation/netlink/specs/ovs_flow.yaml index 4fdfc6b5cae9..a7ab5593a24f 100644 --- a/Documentation/netlink/specs/ovs_flow.yaml +++ b/Documentation/netlink/specs/ovs_flow.yaml @@ -727,6 +727,12 @@ attribute-sets: name: dec-ttl type: nest nested-attributes: dec-ttl-attrs + - + name: emit-sample + type: nest + nested-attributes: emit-sample-attrs + doc: | + Sends a packet sample to psample for external observation. - name: tunnel-key-attrs enum-name: ovs-tunnel-key-attr @@ -938,6 +944,17 @@ attribute-sets: - name: gbp type: u32 + - + name: emit-sample-attrs + enum-name: ovs-emit-sample-attr + name-prefix: ovs-emit-sample-attr- + attributes: + - + name: group + type: u32 + - + name: cookie + type: binary operations: name-prefix: ovs-flow-cmd- diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h index efc82c318fa2..a0e9dde0584a 100644 --- a/include/uapi/linux/openvswitch.h +++ b/include/uapi/linux/openvswitch.h @@ -914,6 +914,30 @@ struct check_pkt_len_arg { }; #endif +#define OVS_EMIT_SAMPLE_COOKIE_MAX_SIZE 16 +/** + * enum ovs_emit_sample_attr - Attributes for %OVS_ACTION_ATTR_EMIT_SAMPLE + * action. + * + * @OVS_EMIT_SAMPLE_ATTR_GROUP: 32-bit number to identify the source of the + * sample. + * @OVS_EMIT_SAMPLE_ATTR_COOKIE: A variable-length binary cookie that contains + * user-defined metadata. The maximum length is 16 bytes. + * + * Sends the packet to the psample multicast group with the specified group and + * cookie. It is possible to combine this action with the + * %OVS_ACTION_ATTR_TRUNC action to limit the size of the packet being emitted. + */ +enum ovs_emit_sample_attr { + OVS_EMIT_SAMPLE_ATTR_UNPSEC, + OVS_EMIT_SAMPLE_ATTR_GROUP, /* u32 number. */ + OVS_EMIT_SAMPLE_ATTR_COOKIE, /* Optional, user specified cookie. */ + __OVS_EMIT_SAMPLE_ATTR_MAX +}; + +#define OVS_EMIT_SAMPLE_ATTR_MAX (__OVS_EMIT_SAMPLE_ATTR_MAX - 1) + + /** * enum ovs_action_attr - Action types. * @@ -1004,6 +1028,7 @@ enum ovs_action_attr { OVS_ACTION_ATTR_ADD_MPLS, /* struct ovs_action_add_mpls. */ OVS_ACTION_ATTR_DEC_TTL, /* Nested OVS_DEC_TTL_ATTR_*. */ OVS_ACTION_ATTR_DROP, /* u32 error code. */ + OVS_ACTION_ATTR_EMIT_SAMPLE, /* Nested OVS_EMIT_SAMPLE_ATTR_*. */ __OVS_ACTION_ATTR_MAX, /* Nothing past this will be accepted * from userspace. */ diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index 964225580824..3b4dba0ded59 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c @@ -24,6 +24,11 @@ #include #include #include + +#if IS_ENABLED(CONFIG_PSAMPLE) +#include +#endif + #include #include "datapath.h" @@ -1299,6 +1304,46 @@ static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key) return 0; } +static int execute_emit_sample(struct datapath *dp, struct sk_buff *skb, + const struct sw_flow_key *key, + const struct nlattr *attr) +{ +#if IS_ENABLED(CONFIG_PSAMPLE) + struct psample_group psample_group = {}; + struct psample_metadata md = {}; + struct vport *input_vport; + const struct nlattr *a; + int rem; + + for (a = nla_data(attr), rem = nla_len(attr); rem > 0; + a = nla_next(a, &rem)) { + switch (nla_type(a)) { + case OVS_EMIT_SAMPLE_ATTR_GROUP: + psample_group.group_num = nla_get_u32(a); + break; + + case OVS_EMIT_SAMPLE_ATTR_COOKIE: + md.user_cookie = nla_data(a); + md.user_cookie_len = nla_len(a); + break; + } + } + + psample_group.net = ovs_dp_get_net(dp); + + input_vport = ovs_vport_rcu(dp, key->phy.in_port); + if (!input_vport) + input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); + + md.in_ifindex = input_vport->dev->ifindex; + md.trunc_size = skb->len - OVS_CB(skb)->cutlen; + + psample_sample_packet(&psample_group, skb, 0, &md); +#endif + + return 0; +} + /* Execute a list of actions against 'skb'. */ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, struct sw_flow_key *key, @@ -1502,6 +1547,11 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, ovs_kfree_skb_reason(skb, reason); return 0; } + + case OVS_ACTION_ATTR_EMIT_SAMPLE: + err = execute_emit_sample(dp, skb, key, a); + OVS_CB(skb)->cutlen = 0; + break; } if (unlikely(err)) { diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c index f224d9bcea5e..eb59ff9c8154 100644 --- a/net/openvswitch/flow_netlink.c +++ b/net/openvswitch/flow_netlink.c @@ -64,6 +64,7 @@ static bool actions_may_change_flow(const struct nlattr *actions) case OVS_ACTION_ATTR_TRUNC: case OVS_ACTION_ATTR_USERSPACE: case OVS_ACTION_ATTR_DROP: + case OVS_ACTION_ATTR_EMIT_SAMPLE: break; case OVS_ACTION_ATTR_CT: @@ -2409,7 +2410,7 @@ static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len) /* Whenever new actions are added, the need to update this * function should be considered. */ - BUILD_BUG_ON(OVS_ACTION_ATTR_MAX != 24); + BUILD_BUG_ON(OVS_ACTION_ATTR_MAX != 25); if (!actions) return; @@ -3157,6 +3158,29 @@ static int validate_and_copy_check_pkt_len(struct net *net, return 0; } +static int validate_emit_sample(const struct nlattr *attr) +{ + static const struct nla_policy policy[OVS_EMIT_SAMPLE_ATTR_MAX + 1] = { + [OVS_EMIT_SAMPLE_ATTR_GROUP] = { .type = NLA_U32 }, + [OVS_EMIT_SAMPLE_ATTR_COOKIE] = { + .type = NLA_BINARY, + .len = OVS_EMIT_SAMPLE_COOKIE_MAX_SIZE + }, + }; + struct nlattr *a[OVS_EMIT_SAMPLE_ATTR_MAX + 1]; + int err; + + if (!IS_ENABLED(CONFIG_PSAMPLE)) + return -EOPNOTSUPP; + + err = nla_parse_nested(a, OVS_EMIT_SAMPLE_ATTR_MAX, attr, policy, + NULL); + if (err) + return err; + + return a[OVS_EMIT_SAMPLE_ATTR_GROUP] ? 0 : -EINVAL; +} + static int copy_action(const struct nlattr *from, struct sw_flow_actions **sfa, bool log) { @@ -3212,6 +3236,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, [OVS_ACTION_ATTR_ADD_MPLS] = sizeof(struct ovs_action_add_mpls), [OVS_ACTION_ATTR_DEC_TTL] = (u32)-1, [OVS_ACTION_ATTR_DROP] = sizeof(u32), + [OVS_ACTION_ATTR_EMIT_SAMPLE] = (u32)-1, }; const struct ovs_action_push_vlan *vlan; int type = nla_type(a); @@ -3490,6 +3515,12 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr, return -EINVAL; break; + case OVS_ACTION_ATTR_EMIT_SAMPLE: + err = validate_emit_sample(a); + if (err) + return err; + break; + default: OVS_NLERR(log, "Unknown Action type %d", type); 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Mon, 3 Jun 2024 18:57:35 +0000 (UTC) Received: from antares.redhat.com (unknown [10.39.193.112]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 361A11955F6E; Mon, 3 Jun 2024 18:57:30 +0000 (UTC) From: Adrian Moreno To: netdev@vger.kernel.org Date: Mon, 3 Jun 2024 20:56:40 +0200 Message-ID: <20240603185647.2310748-7-amorenoz@redhat.com> In-Reply-To: <20240603185647.2310748-1-amorenoz@redhat.com> References: <20240603185647.2310748-1-amorenoz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Cc: dev@openvswitch.org, Paolo Abeni , linux-kernel@vger.kernel.org, i.maximets@ovn.org, Eric Dumazet , horms@kernel.org, Jakub Kicinski , "David S. Miller" Subject: [ovs-dev] [PATCH net-next v2 6/9] net: openvswitch: store sampling probability in cb. X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" The behavior of actions might not be the exact same if they are being executed inside a nested sample action. Store the probability of the parent sample action in the skb's cb area. Use the probability in emit_sample to pass it down to psample. Signed-off-by: Adrian Moreno --- include/uapi/linux/openvswitch.h | 3 ++- net/openvswitch/actions.c | 25 ++++++++++++++++++++++--- net/openvswitch/datapath.h | 3 +++ net/openvswitch/vport.c | 1 + 4 files changed, 28 insertions(+), 4 deletions(-) diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h index a0e9dde0584a..9d675725fa2b 100644 --- a/include/uapi/linux/openvswitch.h +++ b/include/uapi/linux/openvswitch.h @@ -649,7 +649,8 @@ enum ovs_flow_attr { * Actions are passed as nested attributes. * * Executes the specified actions with the given probability on a per-packet - * basis. + * basis. Nested actions will be able to access the probability value of the + * parent @OVS_ACTION_ATTR_SAMPLE. */ enum ovs_sample_attr { OVS_SAMPLE_ATTR_UNSPEC, diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index 3b4dba0ded59..33f6d93ba5e4 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c @@ -1048,12 +1048,15 @@ static int sample(struct datapath *dp, struct sk_buff *skb, struct nlattr *sample_arg; int rem = nla_len(attr); const struct sample_arg *arg; + u32 init_probability; bool clone_flow_key; + int err; /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */ sample_arg = nla_data(attr); arg = nla_data(sample_arg); actions = nla_next(sample_arg, &rem); + init_probability = OVS_CB(skb)->probability; if ((arg->probability != U32_MAX) && (!arg->probability || get_random_u32() > arg->probability)) { @@ -1062,9 +1065,21 @@ static int sample(struct datapath *dp, struct sk_buff *skb, return 0; } + if (init_probability) { + OVS_CB(skb)->probability = ((u64)OVS_CB(skb)->probability * + arg->probability / U32_MAX); + } else { + OVS_CB(skb)->probability = arg->probability; + } + clone_flow_key = !arg->exec; - return clone_execute(dp, skb, key, 0, actions, rem, last, - clone_flow_key); + err = clone_execute(dp, skb, key, 0, actions, rem, last, + clone_flow_key); + + if (!last) + OVS_CB(skb)->probability = init_probability; + + return err; } /* When 'last' is true, clone() should always consume the 'skb'. @@ -1313,6 +1328,7 @@ static int execute_emit_sample(struct datapath *dp, struct sk_buff *skb, struct psample_metadata md = {}; struct vport *input_vport; const struct nlattr *a; + u32 rate; int rem; for (a = nla_data(attr), rem = nla_len(attr); rem > 0; @@ -1337,8 +1353,11 @@ static int execute_emit_sample(struct datapath *dp, struct sk_buff *skb, md.in_ifindex = input_vport->dev->ifindex; md.trunc_size = skb->len - OVS_CB(skb)->cutlen; + md.rate_as_probability = 1; + + rate = OVS_CB(skb)->probability ? OVS_CB(skb)->probability : U32_MAX; - psample_sample_packet(&psample_group, skb, 0, &md); + psample_sample_packet(&psample_group, skb, rate, &md); #endif return 0; diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h index 0cd29971a907..9ca6231ea647 100644 --- a/net/openvswitch/datapath.h +++ b/net/openvswitch/datapath.h @@ -115,12 +115,15 @@ struct datapath { * fragmented. * @acts_origlen: The netlink size of the flow actions applied to this skb. * @cutlen: The number of bytes from the packet end to be removed. + * @probability: The sampling probability that was applied to this skb; 0 means + * no sampling has occurred; U32_MAX means 100% probability. */ struct ovs_skb_cb { struct vport *input_vport; u16 mru; u16 acts_origlen; u32 cutlen; + u32 probability; }; #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c index 972ae01a70f7..8732f6e51ae5 100644 --- a/net/openvswitch/vport.c +++ b/net/openvswitch/vport.c @@ -500,6 +500,7 @@ int ovs_vport_receive(struct vport *vport, struct sk_buff *skb, OVS_CB(skb)->input_vport = vport; 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Mon, 03 Jun 2024 14:57:41 -0400 X-MC-Unique: grTpO5YAMvmyg-NemEBKVA-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5C03E1913F60; Mon, 3 Jun 2024 18:57:39 +0000 (UTC) Received: from antares.redhat.com (unknown [10.39.193.112]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 997951955F6E; Mon, 3 Jun 2024 18:57:35 +0000 (UTC) From: Adrian Moreno To: netdev@vger.kernel.org Date: Mon, 3 Jun 2024 20:56:41 +0200 Message-ID: <20240603185647.2310748-8-amorenoz@redhat.com> In-Reply-To: <20240603185647.2310748-1-amorenoz@redhat.com> References: <20240603185647.2310748-1-amorenoz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Cc: dev@openvswitch.org, Paolo Abeni , linux-kernel@vger.kernel.org, i.maximets@ovn.org, Eric Dumazet , horms@kernel.org, Jakub Kicinski , "David S. Miller" Subject: [ovs-dev] [PATCH net-next v2 7/9] net: openvswitch: do not notify drops inside sample X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" The OVS_ACTION_ATTR_SAMPLE action is, in essence, observability-oriented. Apart from some corner case in which it's used a replacement of clone() for old kernels, it's really only used for sFlow, IPFIX and now, local emit_sample. With this in mind, it doesn't make much sense to report OVS_DROP_LAST_ACTION inside sample actions. For instance, if the flow: actions:sample(..,emit_sample(..)),2 triggers a OVS_DROP_LAST_ACTION skb drop event, it would be extremely confusing for users since the packet did reach its destination. This patch makes internal action execution silently consume the skb instead of notifying a drop for this case. Unfortunately, this patch does not remove all potential sources of confusion since, if the sample action itself is the last action, e.g: actions:sample(..,emit_sample(..)) we actually _should_ generate a OVS_DROP_LAST_ACTION event, but we aren't. Sadly, this case is difficult to solve without breaking the optimization by which the skb is not cloned on last sample actions. But, given explicit drop actions are now supported, OVS can just add one after the last sample() and rewrite the flow as: actions:sample(..,emit_sample(..)),drop Signed-off-by: Adrian Moreno Reviewed-by: Simon Horman --- net/openvswitch/actions.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index 33f6d93ba5e4..54fc1abcff95 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c @@ -82,6 +82,15 @@ static struct action_fifo __percpu *action_fifos; static struct action_flow_keys __percpu *flow_keys; static DEFINE_PER_CPU(int, exec_actions_level); +static inline void ovs_drop_skb_last_action(struct sk_buff *skb) +{ + /* Do not emit packet drops inside sample(). */ + if (OVS_CB(skb)->probability) + consume_skb(skb); + else + ovs_kfree_skb_reason(skb, OVS_DROP_LAST_ACTION); +} + /* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys' * space. 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Mon, 3 Jun 2024 18:57:39 +0000 (UTC) From: Adrian Moreno To: netdev@vger.kernel.org Date: Mon, 3 Jun 2024 20:56:42 +0200 Message-ID: <20240603185647.2310748-9-amorenoz@redhat.com> In-Reply-To: <20240603185647.2310748-1-amorenoz@redhat.com> References: <20240603185647.2310748-1-amorenoz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Cc: dev@openvswitch.org, Paolo Abeni , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, i.maximets@ovn.org, Eric Dumazet , horms@kernel.org, Jakub Kicinski , Shuah Khan , "David S. Miller" Subject: [ovs-dev] [PATCH net-next v2 8/9] selftests: openvswitch: add emit_sample action X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" Add sample and emit_sample action support to ovs-dpctl.py. Refactor common attribute parsing logic into an external function. Signed-off-by: Adrian Moreno --- .../selftests/net/openvswitch/ovs-dpctl.py | 162 +++++++++++++++++- 1 file changed, 161 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py index a2395c3f37a1..f8b5362aac8c 100644 --- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py +++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py @@ -8,6 +8,7 @@ import argparse import errno import ipaddress import logging +import math import multiprocessing import re import struct @@ -58,6 +59,7 @@ OVS_FLOW_CMD_DEL = 2 OVS_FLOW_CMD_GET = 3 OVS_FLOW_CMD_SET = 4 +UINT32_MAX = 0xFFFFFFFF def macstr(mac): outstr = ":".join(["%02X" % i for i in mac]) @@ -267,6 +269,75 @@ def parse_extract_field( return str_skipped, data +def parse_attrs(actstr, attr_desc): + """Parses the given action string and returns a list of netlink + attributes based on a list of attribute descriptions. + + Each element in the attribute description list is a tuple such as: + (name, attr_name, parse_func) + where: + name: is the string representing the attribute + attr_name: is the name of the attribute as defined in the uAPI. + parse_func: is a callable accepting a string and returning either + a single object (the parsed attribute value) or a tuple of + two values (the parsed attribute value and the remaining string) + + Returns a list of attributes and the remaining string. + """ + def parse_attr(actstr, key, func): + actstr = actstr[len(key) :] + + if not func: + return None, actstr + + delim = actstr[0] + actstr = actstr[1:] + + if delim == "=": + pos = strcspn(actstr, ",)") + ret = func(actstr[:pos]) + else: + ret = func(actstr) + + if isinstance(ret, tuple): + (datum, actstr) = ret + else: + datum = ret + actstr = actstr[strcspn(actstr, ",)"):] + + if delim == "(": + if not actstr or actstr[0] != ")": + raise ValueError("Action contains unbalanced parentheses") + + actstr = actstr[1:] + + actstr = actstr[strspn(actstr, ", ") :] + + return datum, actstr + + attrs = [] + attr_desc = list(attr_desc) + while actstr and actstr[0] != ")" and attr_desc: + found = False + for i, (key, attr, func) in enumerate(attr_desc): + if actstr.startswith(key): + datum, actstr = parse_attr(actstr, key, func) + attrs.append([attr, datum]) + found = True + del attr_desc[i] + + if not found: + raise ValueError("Unknown attribute: '%s'" % actstr) + + actstr = actstr[strspn(actstr, ", ") :] + + if actstr[0] != ")": + raise ValueError("Action string contains extra garbage or has " + "unbalanced parenthesis: '%s'" % actstr) + + return attrs, actstr[1:] + + class ovs_dp_msg(genlmsg): # include the OVS version # We need a custom header rather than just being able to rely on @@ -285,7 +356,7 @@ class ovsactions(nla): ("OVS_ACTION_ATTR_SET", "none"), ("OVS_ACTION_ATTR_PUSH_VLAN", "none"), ("OVS_ACTION_ATTR_POP_VLAN", "flag"), - ("OVS_ACTION_ATTR_SAMPLE", "none"), + ("OVS_ACTION_ATTR_SAMPLE", "sample"), ("OVS_ACTION_ATTR_RECIRC", "uint32"), ("OVS_ACTION_ATTR_HASH", "none"), ("OVS_ACTION_ATTR_PUSH_MPLS", "none"), @@ -304,8 +375,85 @@ class ovsactions(nla): ("OVS_ACTION_ATTR_ADD_MPLS", "none"), ("OVS_ACTION_ATTR_DEC_TTL", "none"), ("OVS_ACTION_ATTR_DROP", "uint32"), + ("OVS_ACTION_ATTR_EMIT_SAMPLE", "emit_sample"), ) + class emit_sample(nla): + nla_flags = NLA_F_NESTED + + nla_map = ( + ("OVS_EMIT_SAMPLE_ATTR_UNSPEC", "none"), + ("OVS_EMIT_SAMPLE_ATTR_GROUP", "uint32"), + ("OVS_EMIT_SAMPLE_ATTR_COOKIE", "array(uint8)"), + ) + + def dpstr(self, more=False): + args = "group=%d" % self.get_attr("OVS_EMIT_SAMPLE_ATTR_GROUP") + + cookie = self.get_attr("OVS_EMIT_SAMPLE_ATTR_COOKIE") + if cookie: + args += ",cookie(%s)" % \ + "".join(format(x, "02x") for x in cookie) + + return "emit_sample(%s)" % args + + def parse(self, actstr): + desc = ( + ("group", "OVS_EMIT_SAMPLE_ATTR_GROUP", int), + ("cookie", "OVS_EMIT_SAMPLE_ATTR_COOKIE", + lambda x: list(bytearray.fromhex(x))) + ) + + attrs, actstr = parse_attrs(actstr, desc) + + for attr in attrs: + self["attrs"].append(attr) + + return actstr + + class sample(nla): + nla_flags = NLA_F_NESTED + + nla_map = ( + ("OVS_SAMPLE_ATTR_UNSPEC", "none"), + ("OVS_SAMPLE_ATTR_PROBABILITY", "uint32"), + ("OVS_SAMPLE_ATTR_ACTIONS", "ovsactions"), + ) + + def dpstr(self, more=False): + args = [] + + args.append("sample={:.2f}%".format( + 100 * self.get_attr("OVS_SAMPLE_ATTR_PROBABILITY") / + UINT32_MAX)) + + actions = self.get_attr("OVS_SAMPLE_ATTR_ACTIONS") + if actions: + args.append("actions(%s)" % actions.dpstr(more)) + + return "sample(%s)" % ",".join(args) + + def parse(self, actstr): + def parse_nested_actions(actstr): + subacts = ovsactions() + parsed_len = subacts.parse(actstr) + return subacts, actstr[parsed_len :] + + def percent_to_rate(percent): + percent = float(percent.strip('%')) + return int(math.floor(UINT32_MAX * (percent / 100.0) + .5)) + + desc = ( + ("sample", "OVS_SAMPLE_ATTR_PROBABILITY", percent_to_rate), + ("actions", "OVS_SAMPLE_ATTR_ACTIONS", parse_nested_actions), + ) + attrs, actstr = parse_attrs(actstr, desc) + + for attr in attrs: + self["attrs"].append(attr) + + return actstr + class ctact(nla): nla_flags = NLA_F_NESTED @@ -643,6 +791,18 @@ class ovsactions(nla): self["attrs"].append(["OVS_ACTION_ATTR_CT", ctact]) parsed = True + elif parse_starts_block(actstr, "sample(", False): + sampleact = self.sample() + actstr = sampleact.parse(actstr[len("sample(") : ]) + self["attrs"].append(["OVS_ACTION_ATTR_SAMPLE", sampleact]) + parsed = True + + elif parse_starts_block(actstr, "emit_sample(", False): + emitact = self.emit_sample() + actstr = emitact.parse(actstr[len("emit_sample(") : ]) + self["attrs"].append(["OVS_ACTION_ATTR_EMIT_SAMPLE", emitact]) + parsed = True + actstr = actstr[strspn(actstr, ", ") :] while parencount > 0: parencount -= 1 From patchwork Mon Jun 3 18:56:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Adri=C3=A1n_Moreno?= X-Patchwork-Id: 1943014 X-Patchwork-Delegate: horms@verge.net.au Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=gOKoPDDe; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org (client-ip=2605:bc80:3010::136; helo=smtp3.osuosl.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=patchwork.ozlabs.org) Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4VtNKl1492z20Q1 for ; Tue, 4 Jun 2024 04:58:35 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 7ACD661121; Mon, 3 Jun 2024 18:58:33 +0000 (UTC) X-Virus-Scanned: amavis at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavis, port 10024) with ESMTP id KUaI3gAnYFAI; Mon, 3 Jun 2024 18:58:30 +0000 (UTC) X-Comment: SPF check N/A for local connections - 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Miller" Subject: [ovs-dev] [PATCH net-next v2 9/9] selftests: openvswitch: add emit_sample test X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" Add a test to verify sampling packets via psample works. In order to do that, create a subcommand in ovs-dpctl.py to listen to on the psample multicast group and print samples. In order to also test simultaneous sFlow and psample actions and packet truncation, add missing parsing support for "userspace" and "trunc" actions. Signed-off-by: Adrian Moreno --- .../selftests/net/openvswitch/openvswitch.sh | 99 +++++++++++++++- .../selftests/net/openvswitch/ovs-dpctl.py | 112 +++++++++++++++++- 2 files changed, 204 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh index 5cae53543849..f6e0ae3f6424 100755 --- a/tools/testing/selftests/net/openvswitch/openvswitch.sh +++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh @@ -20,7 +20,8 @@ tests=" nat_related_v4 ip4-nat-related: ICMP related matches work with SNAT netlink_checks ovsnl: validate netlink attrs and settings upcall_interfaces ovs: test the upcall interfaces - drop_reason drop: test drop reasons are emitted" + drop_reason drop: test drop reasons are emitted + emit_sample emit_sample: Sampling packets with psample" info() { [ $VERBOSE = 0 ] || echo $* @@ -170,6 +171,19 @@ ovs_drop_reason_count() return `echo "$perf_output" | grep "$pattern" | wc -l` } +ovs_test_flow_fails () { + ERR_MSG="Flow actions may not be safe on all matching packets" + + PRE_TEST=$(dmesg | grep -c "${ERR_MSG}") + ovs_add_flow $@ &> /dev/null $@ && return 1 + POST_TEST=$(dmesg | grep -c "${ERR_MSG}") + + if [ "$PRE_TEST" == "$POST_TEST" ]; then + return 1 + fi + return 0 +} + usage() { echo echo "$0 [OPTIONS] [TEST]..." @@ -184,6 +198,89 @@ usage() { exit 1 } + +# emit_sample test +# - use emit_sample to observe packets +test_emit_sample() { + sbx_add "test_emit_sample" || return $? + + # Add a datapath with per-vport dispatching. + ovs_add_dp "test_emit_sample" emit_sample -V 2:1 || return 1 + + info "create namespaces" + ovs_add_netns_and_veths "test_emit_sample" "emit_sample" \ + client c0 c1 172.31.110.10/24 -u || return 1 + ovs_add_netns_and_veths "test_emit_sample" "emit_sample" \ + server s0 s1 172.31.110.20/24 -u || return 1 + + # Check if emit_sample actions can be configured. + ovs_add_flow "test_emit_sample" emit_sample \ + 'in_port(1),eth(),eth_type(0x0806),arp()' 'emit_sample(group=1)' + if [ $? == 1 ]; then + info "no support for emit_sample - skipping" + ovs_exit_sig + return $ksft_skip + fi + + ovs_del_flows "test_emit_sample" emit_sample + + # Allow ARP + ovs_add_flow "test_emit_sample" emit_sample \ + 'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1 + ovs_add_flow "test_emit_sample" emit_sample \ + 'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1 + + # Test action verification. + OLDIFS=$IFS + IFS='*' + min_key='in_port(1),eth(),eth_type(0x0800),ipv4()' + for testcase in \ + "cookie to large"*"emit_sample(group=1,cookie=1615141312111009080706050403020100)" \ + "no group with cookie"*"emit_sample(cookie=abcd)" \ + "no group"*"sample()"; + do + set -- $testcase; + ovs_test_flow_fails "test_emit_sample" emit_sample $min_key $2 + if [ $? == 1 ]; then + info "failed - $1" + return 1 + fi + done + IFS=$OLDIFS + + # Sample first 14 bytes of all traffic. + ovs_add_flow "test_emit_sample" emit_sample \ + "in_port(1),eth(),eth_type(0x0800),ipv4(src=172.31.110.10,proto=1),icmp()" "trunc(14),emit_sample(group=1,cookie=c0ffee),2" + + # Sample all traffic. In this case, use a sample() action with both + # emit_sample and an upcall emulating simultaneous local sampling and + # sFlow / IPFIX. + nlpid=$(grep -E "listening on upcall packet handler" $ovs_dir/s0.out | cut -d ":" -f 2 | tr -d ' ') + ovs_add_flow "test_emit_sample" emit_sample \ + "in_port(2),eth(),eth_type(0x0800),ipv4(src=172.31.110.20,proto=1),icmp()" "sample(sample=100%,actions(emit_sample(group=2,cookie=eeff0c),userspace(pid=${nlpid},userdata=eeff0c))),1" + + # Record emit_sample data. + python3 $ovs_base/ovs-dpctl.py psample >$ovs_dir/psample.out 2>$ovs_dir/psample.err & + pid=$! + on_exit "ovs_sbx test_emit_sample kill -TERM $pid 2>/dev/null" + + # Send a single ping. + sleep 1 + ovs_sbx "test_emit_sample" ip netns exec client ping -I c1 172.31.110.20 -c 1 || return 1 + sleep 1 + + # We should have received one userspace action upcall and 2 psample packets. + grep -E "userspace action command" $ovs_dir/s0.out >/dev/null 2>&1 || return 1 + + # client -> server samples should only contain the first 14 bytes of the packet. + grep -E "rate:4294967295,group:1,cookie:c0ffee data:[0-9a-f]{28}$" \ + $ovs_dir/psample.out >/dev/null 2>&1 || return 1 + grep -E "rate:4294967295,group:2,cookie:eeff0c" \ + $ovs_dir/psample.out >/dev/null 2>&1 || return 1 + + return 0 +} + # drop_reason test # - drop packets and verify the right drop reason is reported test_drop_reason() { diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py index f8b5362aac8c..44fdeb9491a2 100644 --- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py +++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py @@ -27,8 +27,10 @@ try: from pyroute2.netlink import genlmsg from pyroute2.netlink import nla from pyroute2.netlink import nlmsg_atoms - from pyroute2.netlink.exceptions import NetlinkError + from pyroute2.netlink.event import EventSocket from pyroute2.netlink.generic import GenericNetlinkSocket + from pyroute2.netlink.nlsocket import Marshal + from pyroute2.netlink.exceptions import NetlinkError import pyroute2 except ModuleNotFoundError: @@ -575,13 +577,27 @@ class ovsactions(nla): print_str += "userdata=" for f in self.get_attr("OVS_USERSPACE_ATTR_USERDATA"): print_str += "%x." % f - if self.get_attr("OVS_USERSPACE_ATTR_TUN_PORT") is not None: + if self.get_attr("OVS_USERSPACE_ATTR_EGRESS_TUN_PORT") is not None: print_str += "egress_tun_port=%d" % self.get_attr( - "OVS_USERSPACE_ATTR_TUN_PORT" + "OVS_USERSPACE_ATTR_EGRESS_TUN_PORT" ) print_str += ")" return print_str + def parse(self, actstr): + attrs_desc = ( + ("pid", "OVS_USERSPACE_ATTR_PID", int), + ("userdata", "OVS_USERSPACE_ATTR_USERDATA", + lambda x: list(bytearray.fromhex(x))), + ("egress_tun_port", "OVS_USERSPACE_ATTR_EGRESS_TUN_PORT", int) + ) + + attrs, actstr = parse_attrs(actstr, attrs_desc) + for attr in attrs: + self["attrs"].append(attr) + + return actstr + def dpstr(self, more=False): print_str = "" @@ -803,6 +819,25 @@ class ovsactions(nla): self["attrs"].append(["OVS_ACTION_ATTR_EMIT_SAMPLE", emitact]) parsed = True + elif parse_starts_block(actstr, "userspace(", False): + uact = self.userspace() + actstr = uact.parse(actstr[len("userpsace(") : ]) + self["attrs"].append(["OVS_ACTION_ATTR_USERSPACE", uact]) + parsed = True + + elif parse_starts_block(actstr, "trunc", False): + parencount += 1 + actstr, val = parse_extract_field( + actstr, + "trunc(", + r"([0-9]+)", + int, + False, + None, + ) + self["attrs"].append(["OVS_ACTION_ATTR_TRUNC", val]) + parsed = True + actstr = actstr[strspn(actstr, ", ") :] while parencount > 0: parencount -= 1 @@ -2184,10 +2219,70 @@ class OvsFlow(GenericNetlinkSocket): print("MISS upcall[%d/%s]: %s" % (seq, pktpres, keystr), flush=True) def execute(self, packetmsg): - print("userspace execute command") + print("userspace execute command", flush=True) def action(self, packetmsg): - print("userspace action command") + print("userspace action command", flush=True) + + +class psample_sample(genlmsg): + nla_map = ( + ("PSAMPLE_ATTR_IIFINDEX", "none"), + ("PSAMPLE_ATTR_OIFINDEX", "none"), + ("PSAMPLE_ATTR_ORIGSIZE", "none"), + ("PSAMPLE_ATTR_SAMPLE_GROUP", "uint32"), + ("PSAMPLE_ATTR_GROUP_SEQ", "none"), + ("PSAMPLE_ATTR_SAMPLE_RATE", "uint32"), + ("PSAMPLE_ATTR_DATA", "array(uint8)"), + ("PSAMPLE_ATTR_GROUP_REFCOUNT", "none"), + ("PSAMPLE_ATTR_TUNNEL", "none"), + ("PSAMPLE_ATTR_PAD", "none"), + ("PSAMPLE_ATTR_OUT_TC", "none"), + ("PSAMPLE_ATTR_OUT_TC_OCC", "none"), + ("PSAMPLE_ATTR_LATENCY", "none"), + ("PSAMPLE_ATTR_TIMESTAMP", "none"), + ("PSAMPLE_ATTR_PROTO", "none"), + ("PSAMPLE_ATTR_USER_COOKIE", "array(uint8)"), + ) + + def dpstr(self): + fields = [] + data = "" + for (attr, value) in self["attrs"]: + if attr == "PSAMPLE_ATTR_SAMPLE_GROUP": + fields.append("group:%d" % value) + if attr == "PSAMPLE_ATTR_SAMPLE_RATE": + fields.append("rate:%d" % value) + if attr == "PSAMPLE_ATTR_USER_COOKIE": + value = "".join(format(x, "02x") for x in value) + fields.append("cookie:%s" % value) + if attr == "PSAMPLE_ATTR_DATA" and len(value) > 0: + data = "data:%s" % "".join(format(x, "02x") for x in value) + + return ("%s %s" % (",".join(fields), data)).strip() + + +class psample_msg(Marshal): + PSAMPLE_CMD_SAMPLE = 0 + PSAMPLE_CMD_GET_GROUP = 1 + PSAMPLE_CMD_NEW_GROUP = 2 + PSAMPLE_CMD_DEL_GROUP = 3 + PSAMPLE_CMD_SET_FILTER = 4 + msg_map = {PSAMPLE_CMD_SAMPLE: psample_sample} + + +class Psample(EventSocket): + genl_family = "psample" + mcast_groups = ["packets"] + marshal_class = psample_msg + + def read_samples(self): + while True: + try: + for msg in self.get(): + print(msg.dpstr(), flush=True) + except NetlinkError as ne: + raise ne def print_ovsdp_full(dp_lookup_rep, ifindex, ndb=NDB(), vpl=OvsVport()): @@ -2247,7 +2342,7 @@ def main(argv): help="Increment 'verbose' output counter.", default=0, ) - subparsers = parser.add_subparsers() + subparsers = parser.add_subparsers(dest="subcommand") showdpcmd = subparsers.add_parser("show") showdpcmd.add_argument( @@ -2304,6 +2399,8 @@ def main(argv): delfscmd = subparsers.add_parser("del-flows") delfscmd.add_argument("flsbr", help="Datapath name") + subparsers.add_parser("psample") + args = parser.parse_args() if args.verbose > 0: @@ -2318,6 +2415,9 @@ def main(argv): sys.setrecursionlimit(100000) + if args.subcommand == "psample": + Psample().read_samples() + if hasattr(args, "showdp"): found = False for iface in ndb.interfaces: