[net-next v2 0/4] Openvswitch meter action

[net-next v2 0/4] Openvswitch meter action

[Andy Zhou]

This patch series is the first attempt to add openvswitch
meter support. We have previously experimented with adding
metering support in nftables. However 1) It was not clear
how to expose a named nftables object cleanly, and 2)
the logic that implements metering is quite small, < 100 lines
of code.

With those two observations, it seems cleaner to add meter
support in the openvswitch module directly.

---
    v1(RFC)->v2:  remove unused code
                  improve locking
                  and other review comments

Andy Zhou (4):
  openvswitch: Add meter netlink definitions
  openvswitch: export get_dp() API.
  openvswitch: Add meter infrastructure
  openvswitch: Add meter action support

 include/uapi/linux/openvswitch.h |  54 ++++
 net/openvswitch/Makefile         |   1 +
 net/openvswitch/actions.c        |   6 +
 net/openvswitch/datapath.c       |  43 +--
 net/openvswitch/datapath.h       |  35 +++
 net/openvswitch/flow_netlink.c   |   6 +
 net/openvswitch/meter.c          | 604 +++++++++++++++++++++++++++++++++++++++
 net/openvswitch/meter.h          |  54 ++++
 8 files changed, 772 insertions(+), 31 deletions(-)
 create mode 100644 net/openvswitch/meter.c
 create mode 100644 net/openvswitch/meter.h

-- 
1.8.3.1

[net-next v2 1/4] openvswitch: Add meter netlink definitions

[Andy Zhou]

Meter has its own netlink family. Define netlink messages and attributes
for communicating with the user space programs.

Signed-off-by: Andy Zhou <azhou@ovn.org>
---
 include/uapi/linux/openvswitch.h | 51 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
index 0cd6f8833147..d413a2398214 100644
--- a/include/uapi/linux/openvswitch.h
+++ b/include/uapi/linux/openvswitch.h
@@ -851,4 +851,55 @@ enum ovs_action_attr {
 
 #define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
 
+/* Meters. */
+#define OVS_METER_FAMILY  "ovs_meter"
+#define OVS_METER_MCGROUP "ovs_meter"
+#define OVS_METER_VERSION 0x1
+
+enum ovs_meter_cmd {
+	OVS_METER_CMD_UNSPEC,
+	OVS_METER_CMD_FEATURES,	/* Get features supported by the datapath. */
+	OVS_METER_CMD_SET,	/* Add or modify a meter. */
+	OVS_METER_CMD_DEL,	/* Delete a meter. */
+	OVS_METER_CMD_GET	/* Get meter stats. */
+};
+
+enum ovs_meter_attr {
+	OVS_METER_ATTR_UNSPEC,
+	OVS_METER_ATTR_ID,	/* u32 meter ID within datapath. */
+	OVS_METER_ATTR_KBPS,	/* No argument. If set, units in kilobits
+				 * per second. Otherwise, units in
+				 * packets per second.
+				 */
+	OVS_METER_ATTR_STATS,	/* struct ovs_flow_stats for the meter. */
+	OVS_METER_ATTR_BANDS,	/* Nested attributes for meter bands. */
+	OVS_METER_ATTR_USED,	/* u64 msecs last used in monotonic time. */
+	OVS_METER_ATTR_CLEAR,	/* Flag to clear stats, used. */
+	OVS_METER_ATTR_MAX_METERS, /* u32 number of meters supported. */
+	OVS_METER_ATTR_MAX_BANDS,  /* u32 max number of bands per meter. */
+	OVS_METER_ATTR_PAD,
+	__OVS_METER_ATTR_MAX
+};
+
+#define OVS_METER_ATTR_MAX (__OVS_METER_ATTR_MAX - 1)
+
+enum ovs_band_attr {
+	OVS_BAND_ATTR_UNSPEC,
+	OVS_BAND_ATTR_TYPE,	/* u32 OVS_METER_BAND_TYPE_* constant. */
+	OVS_BAND_ATTR_RATE,	/* u32 band rate in meter units (see above). */
+	OVS_BAND_ATTR_BURST,	/* u32 burst size in meter units. */
+	OVS_BAND_ATTR_STATS,	/* struct ovs_flow_stats for the band. */
+	__OVS_BAND_ATTR_MAX
+};
+
+#define OVS_BAND_ATTR_MAX (__OVS_BAND_ATTR_MAX - 1)
+
+enum ovs_meter_band_type {
+	OVS_METER_BAND_TYPE_UNSPEC,
+	OVS_METER_BAND_TYPE_DROP,   /* Drop exceeding packets. */
+	__OVS_METER_BAND_TYPE_MAX
+};
+
+#define OVS_METER_BAND_TYPE_MAX (__OVS_METER_BAND_TYPE_MAX - 1)
+
 #endif /* _LINUX_OPENVSWITCH_H */
-- 
1.8.3.1

[net-next v2 2/4] openvswitch: export get_dp() API.

[Andy Zhou]

Later patches will invoke get_dp() outside of datapath.c. Export it.

Signed-off-by: Andy Zhou <azhou@ovn.org>
---
 net/openvswitch/datapath.c | 29 -----------------------------
 net/openvswitch/datapath.h | 31 +++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 29 deletions(-)

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index c3aec6227c91..ac7154018676 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -142,35 +142,6 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
 				  const struct dp_upcall_info *,
 				  uint32_t cutlen);
 
-/* Must be called with rcu_read_lock. */
-static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
-{
-	struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
-
-	if (dev) {
-		struct vport *vport = ovs_internal_dev_get_vport(dev);
-		if (vport)
-			return vport->dp;
-	}
-
-	return NULL;
-}
-
-/* The caller must hold either ovs_mutex or rcu_read_lock to keep the
- * returned dp pointer valid.
- */
-static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
-{
-	struct datapath *dp;
-
-	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
-	rcu_read_lock();
-	dp = get_dp_rcu(net, dp_ifindex);
-	rcu_read_unlock();
-
-	return dp;
-}
-
 /* Must be called with rcu_read_lock or ovs_mutex. */
 const char *ovs_dp_name(const struct datapath *dp)
 {
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index 480600649d0b..ad14b571219d 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -30,6 +30,7 @@
 #include "conntrack.h"
 #include "flow.h"
 #include "flow_table.h"
+#include "vport-internal_dev.h"
 
 #define DP_MAX_PORTS           USHRT_MAX
 #define DP_VPORT_HASH_BUCKETS  1024
@@ -190,6 +191,36 @@ static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_n
 	return ovs_lookup_vport(dp, port_no);
 }
 
+/* Must be called with rcu_read_lock. */
+static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
+{
+	struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
+
+	if (dev) {
+		struct vport *vport = ovs_internal_dev_get_vport(dev);
+
+		if (vport)
+			return vport->dp;
+	}
+
+	return NULL;
+}
+
+/* The caller must hold either ovs_mutex or rcu_read_lock to keep the
+ * returned dp pointer valid.
+ */
+static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
+{
+	struct datapath *dp;
+
+	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
+	rcu_read_lock();
+	dp = get_dp_rcu(net, dp_ifindex);
+	rcu_read_unlock();
+
+	return dp;
+}
+
 extern struct notifier_block ovs_dp_device_notifier;
 extern struct genl_family dp_vport_genl_family;
 
-- 
1.8.3.1

[net-next v2 3/4] openvswitch: Add meter infrastructure

[Andy Zhou]

OVS kernel datapath so far does not support Openflow meter action.
This is the first stab at adding kernel datapath meter support.
This implementation supports only drop band type.

Signed-off-by: Andy Zhou <azhou@ovn.org>
---
 net/openvswitch/Makefile   |   1 +
 net/openvswitch/datapath.c |  14 +-
 net/openvswitch/datapath.h |   3 +
 net/openvswitch/meter.c    | 604 +++++++++++++++++++++++++++++++++++++++++++++
 net/openvswitch/meter.h    |  54 ++++
 5 files changed, 674 insertions(+), 2 deletions(-)
 create mode 100644 net/openvswitch/meter.c
 create mode 100644 net/openvswitch/meter.h

diff --git a/net/openvswitch/Makefile b/net/openvswitch/Makefile
index 60f809085b92..658383fbdf53 100644
--- a/net/openvswitch/Makefile
+++ b/net/openvswitch/Makefile
@@ -11,6 +11,7 @@ openvswitch-y := \
 	flow.o \
 	flow_netlink.o \
 	flow_table.o \
+	meter.o \
 	vport.o \
 	vport-internal_dev.o \
 	vport-netdev.o
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index ac7154018676..eef8d3ea3aae 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -55,6 +55,7 @@
 #include "flow.h"
 #include "flow_table.h"
 #include "flow_netlink.h"
+#include "meter.h"
 #include "vport-internal_dev.h"
 #include "vport-netdev.h"
 
@@ -174,6 +175,7 @@ static void destroy_dp_rcu(struct rcu_head *rcu)
 	ovs_flow_tbl_destroy(&dp->table);
 	free_percpu(dp->stats_percpu);
 	kfree(dp->ports);
+	ovs_meters_exit(dp);
 	kfree(dp);
 }
 
@@ -1572,6 +1574,10 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
 	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
 		INIT_HLIST_HEAD(&dp->ports[i]);
 
+	err = ovs_meters_init(dp);
+	if (err)
+		goto err_destroy_ports_array;
+
 	/* Set up our datapath device. */
 	parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
 	parms.type = OVS_VPORT_TYPE_INTERNAL;
@@ -1600,7 +1606,7 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
 				ovs_dp_reset_user_features(skb, info);
 		}
 
-		goto err_destroy_ports_array;
+		goto err_destroy_meters;
 	}
 
 	err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
@@ -1615,8 +1621,10 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
 	ovs_notify(&dp_datapath_genl_family, reply, info);
 	return 0;
 
-err_destroy_ports_array:
+err_destroy_meters:
 	ovs_unlock();
+	ovs_meters_exit(dp);
+err_destroy_ports_array:
 	kfree(dp->ports);
 err_destroy_percpu:
 	free_percpu(dp->stats_percpu);
@@ -2244,6 +2252,7 @@ struct genl_family dp_vport_genl_family __ro_after_init = {
 	&dp_vport_genl_family,
 	&dp_flow_genl_family,
 	&dp_packet_genl_family,
+	&dp_meter_genl_family,
 };
 
 static void dp_unregister_genl(int n_families)
@@ -2424,3 +2433,4 @@ static void dp_cleanup(void)
 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index ad14b571219d..d1ffa1d9fe57 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -92,6 +92,9 @@ struct datapath {
 	u32 user_features;
 
 	u32 max_headroom;
+
+	/* Switch meters. */
+	struct hlist_head *meters;
 };
 
 /**
diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
new file mode 100644
index 000000000000..ff57c1cb5f6a
--- /dev/null
+++ b/net/openvswitch/meter.c
@@ -0,0 +1,604 @@
+/*
+ * Copyright (c) 2017 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/if.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/openvswitch.h>
+#include <linux/netlink.h>
+#include <linux/rculist.h>
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include "datapath.h"
+#include "meter.h"
+
+#define METER_HASH_BUCKETS 1024
+
+static const struct nla_policy meter_policy[OVS_METER_ATTR_MAX + 1] = {
+	[OVS_METER_ATTR_ID] = { .type = NLA_U32, },
+	[OVS_METER_ATTR_KBPS] = { .type = NLA_FLAG },
+	[OVS_METER_ATTR_STATS] = { .len = sizeof(struct ovs_flow_stats) },
+	[OVS_METER_ATTR_BANDS] = { .type = NLA_NESTED },
+	[OVS_METER_ATTR_USED] = { .type = NLA_U64 },
+	[OVS_METER_ATTR_CLEAR] = { .type = NLA_FLAG },
+	[OVS_METER_ATTR_MAX_METERS] = { .type = NLA_U32 },
+	[OVS_METER_ATTR_MAX_BANDS] = { .type = NLA_U32 },
+};
+
+static const struct nla_policy band_policy[OVS_BAND_ATTR_MAX + 1] = {
+	[OVS_BAND_ATTR_TYPE] = { .type = NLA_U32, },
+	[OVS_BAND_ATTR_RATE] = { .type = NLA_U32, },
+	[OVS_BAND_ATTR_BURST] = { .type = NLA_U32, },
+	[OVS_BAND_ATTR_STATS] = { .len = sizeof(struct ovs_flow_stats) },
+};
+
+static void rcu_free_ovs_meter_callback(struct rcu_head *rcu)
+{
+	struct dp_meter *meter = container_of(rcu, struct dp_meter, rcu);
+
+	kfree(meter);
+}
+
+static void ovs_meter_free(struct dp_meter *meter)
+{
+	if (!meter)
+		return;
+
+	call_rcu(&meter->rcu, rcu_free_ovs_meter_callback);
+}
+
+static struct hlist_head *meter_hash_bucket(const struct datapath *dp,
+					    u32 meter_id)
+{
+	return &dp->meters[meter_id & (METER_HASH_BUCKETS - 1)];
+}
+
+/* Call with ovs_mutex or RCU read lock. */
+static struct dp_meter *lookup_meter(const struct datapath *dp,
+				     u32 meter_id)
+{
+	struct dp_meter *meter;
+	struct hlist_head *head;
+
+	head = meter_hash_bucket(dp, meter_id);
+	hlist_for_each_entry_rcu(meter, head, dp_hash_node) {
+		if (meter->id == meter_id)
+			return meter;
+	}
+	return NULL;
+}
+
+static void attach_meter(struct datapath *dp, struct dp_meter *meter)
+{
+	struct hlist_head *head = meter_hash_bucket(dp, meter->id);
+
+	hlist_add_head_rcu(&meter->dp_hash_node, head);
+}
+
+static void detach_meter(struct dp_meter *meter)
+{
+	ASSERT_OVSL();
+	if (meter)
+		hlist_del_rcu(&meter->dp_hash_node);
+}
+
+static struct sk_buff *
+ovs_meter_cmd_reply_start(struct genl_info *info, u8 cmd,
+			  struct ovs_header **ovs_reply_header)
+{
+	struct sk_buff *skb;
+	struct ovs_header *ovs_header = info->userhdr;
+
+	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	*ovs_reply_header = genlmsg_put(skb, info->snd_portid,
+					info->snd_seq,
+					&dp_meter_genl_family, 0, cmd);
+	if (!ovs_reply_header) {
+		nlmsg_free(skb);
+		return ERR_PTR(-EMSGSIZE);
+	}
+	(*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
+
+	return skb;
+}
+
+static int ovs_meter_cmd_reply_stats(struct sk_buff *reply, u32 meter_id,
+				     struct dp_meter *meter)
+{
+	struct nlattr *nla;
+	struct dp_meter_band *band;
+	u16 i;
+
+	if (nla_put_u32(reply, OVS_METER_ATTR_ID, meter_id))
+		goto error;
+
+	if (!meter)
+		return 0;
+
+	if (nla_put(reply, OVS_METER_ATTR_STATS,
+		    sizeof(struct ovs_flow_stats), &meter->stats) ||
+	    nla_put_u64_64bit(reply, OVS_METER_ATTR_USED, meter->used,
+			      OVS_METER_ATTR_PAD))
+		goto error;
+
+	nla = nla_nest_start(reply, OVS_METER_ATTR_BANDS);
+	if (!nla)
+		goto error;
+
+	band = meter->bands;
+
+	for (i = 0; i < meter->n_bands; ++i, ++band) {
+		struct nlattr *band_nla;
+
+		band_nla = nla_nest_start(reply, OVS_BAND_ATTR_UNSPEC);
+		if (!band_nla || nla_put(reply, OVS_BAND_ATTR_STATS,
+					 sizeof(struct ovs_flow_stats),
+					 &band->stats))
+			goto error;
+		nla_nest_end(reply, band_nla);
+	}
+	nla_nest_end(reply, nla);
+
+	return 0;
+error:
+	return -EMSGSIZE;
+}
+
+static int ovs_meter_cmd_features(struct sk_buff *skb, struct genl_info *info)
+{
+	struct sk_buff *reply;
+	struct ovs_header *ovs_reply_header;
+	struct nlattr *nla, *band_nla;
+	int err;
+
+	reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_FEATURES,
+					  &ovs_reply_header);
+	if (!reply)
+		return PTR_ERR(reply);
+
+	if (nla_put_u32(reply, OVS_METER_ATTR_MAX_METERS, U32_MAX) ||
+	    nla_put_u32(reply, OVS_METER_ATTR_MAX_BANDS, DP_MAX_BANDS))
+		goto nla_put_failure;
+
+	nla = nla_nest_start(reply, OVS_METER_ATTR_BANDS);
+	if (!nla)
+		goto nla_put_failure;
+
+	band_nla = nla_nest_start(reply, OVS_BAND_ATTR_UNSPEC);
+	if (!band_nla)
+		goto nla_put_failure;
+	/* Currently only DROP band type is supported. */
+	if (nla_put_u32(reply, OVS_BAND_ATTR_TYPE, OVS_METER_BAND_TYPE_DROP))
+		goto nla_put_failure;
+	nla_nest_end(reply, band_nla);
+	nla_nest_end(reply, nla);
+
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+nla_put_failure:
+	nlmsg_free(reply);
+	err = -EMSGSIZE;
+	return err;
+}
+
+static struct dp_meter *dp_meter_create(struct nlattr **a)
+{
+	struct nlattr *nla;
+	int rem;
+	u16 n_bands = 0;
+	struct dp_meter *meter;
+	struct dp_meter_band *band;
+	int err;
+
+	/* Validate attributes, count the bands. */
+	if (!a[OVS_METER_ATTR_BANDS])
+		return ERR_PTR(-EINVAL);
+
+	nla_for_each_nested(nla, a[OVS_METER_ATTR_BANDS], rem)
+		if (++n_bands > DP_MAX_BANDS)
+			return ERR_PTR(-EINVAL);
+
+	/* Allocate and set up the meter before locking anything. */
+	meter = kzalloc(n_bands * sizeof(struct dp_meter_band) +
+			sizeof(*meter), GFP_KERNEL);
+	if (!meter)
+		return ERR_PTR(-ENOMEM);
+
+	meter->used = ktime_get_ns() / 1000 / 1000;
+	meter->kbps = a[OVS_METER_ATTR_KBPS] ? 1 : 0;
+	meter->keep_stats = !a[OVS_METER_ATTR_CLEAR];
+	spin_lock_init(&meter->lock);
+	if (meter->keep_stats && a[OVS_METER_ATTR_STATS]) {
+		meter->stats = *(struct ovs_flow_stats *)
+			nla_data(a[OVS_METER_ATTR_STATS]);
+	}
+	meter->n_bands = n_bands;
+
+	/* Set up meter bands. */
+	band = meter->bands;
+	nla_for_each_nested(nla, a[OVS_METER_ATTR_BANDS], rem) {
+		struct nlattr *attr[OVS_BAND_ATTR_MAX + 1];
+		u32 band_max_delta_t;
+
+		err = nla_parse((struct nlattr **)&attr, OVS_BAND_ATTR_MAX,
+				nla_data(nla), nla_len(nla), band_policy,
+				NULL);
+		if (err)
+			goto exit_free_meter;
+
+		if (!attr[OVS_BAND_ATTR_TYPE] ||
+		    !attr[OVS_BAND_ATTR_RATE] ||
+		    !attr[OVS_BAND_ATTR_BURST]) {
+			err = -EINVAL;
+			goto exit_free_meter;
+		}
+
+		band->type = nla_get_u32(attr[OVS_BAND_ATTR_TYPE]);
+		band->rate = nla_get_u32(attr[OVS_BAND_ATTR_RATE]);
+		band->burst_size = nla_get_u32(attr[OVS_BAND_ATTR_BURST]);
+		/* Figure out max delta_t that is enough to fill any bucket.
+		 * Keep max_delta_t size to the bucket units:
+		 * pkts => 1/1000 packets, kilobits => bits.
+		 */
+		band_max_delta_t = (band->burst_size + band->rate) * 1000;
+		/* Start with a full bucket. */
+		band->bucket = band_max_delta_t;
+		if (band_max_delta_t > meter->max_delta_t)
+			meter->max_delta_t = band_max_delta_t;
+		band++;
+	}
+
+	return meter;
+
+exit_free_meter:
+	kfree(meter);
+	return ERR_PTR(err);
+}
+
+static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	struct dp_meter *meter, *old_meter;
+	struct sk_buff *reply;
+	struct ovs_header *ovs_reply_header;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct datapath *dp;
+	int err;
+	u32 meter_id;
+	bool failed;
+
+	meter = dp_meter_create(a);
+	if (IS_ERR_OR_NULL(meter))
+		return PTR_ERR(meter);
+
+	reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
+					  &ovs_reply_header);
+	if (IS_ERR(reply)) {
+		err = PTR_ERR(reply);
+		goto exit_free_meter;
+	}
+
+	ovs_lock();
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		err = -ENODEV;
+		goto exit_unlock;
+	}
+
+	if (!a[OVS_METER_ATTR_ID]) {
+		err = -ENODEV;
+		goto exit_unlock;
+	}
+
+	meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
+
+	/* Cannot fail after this. */
+	old_meter = lookup_meter(dp, meter_id);
+	detach_meter(old_meter);
+	attach_meter(dp, meter);
+	ovs_unlock();
+
+	/* Build response with the meter_id and stats from
+	 * the old meter, if any.
+	 */
+	failed = nla_put_u32(reply, OVS_METER_ATTR_ID, meter_id);
+	WARN_ON(failed);
+	if (old_meter) {
+		spin_lock_bh(&old_meter->lock);
+		if (old_meter->keep_stats) {
+			err = ovs_meter_cmd_reply_stats(reply, meter_id,
+							old_meter);
+			WARN_ON(err);
+		}
+		spin_unlock_bh(&old_meter->lock);
+		ovs_meter_free(old_meter);
+	}
+
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_unlock:
+	ovs_unlock();
+	nlmsg_free(reply);
+exit_free_meter:
+	kfree(meter);
+	return err;
+}
+
+static int ovs_meter_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	u32 meter_id;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct ovs_header *ovs_reply_header;
+	struct datapath *dp;
+	int err;
+	struct sk_buff *reply;
+	struct dp_meter *meter;
+
+	if (!a[OVS_METER_ATTR_ID])
+		return -EINVAL;
+
+	meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
+
+	reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_GET,
+					  &ovs_reply_header);
+	if (IS_ERR(reply))
+		return PTR_ERR(reply);
+
+	ovs_lock();
+
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		err = -ENODEV;
+		goto exit_unlock;
+	}
+
+	/* Locate meter, copy stats. */
+	meter = lookup_meter(dp, meter_id);
+	if (!meter) {
+		err = -ENOENT;
+		goto exit_unlock;
+	}
+
+	spin_lock_bh(&meter->lock);
+	err = ovs_meter_cmd_reply_stats(reply, meter_id, meter);
+	spin_unlock_bh(&meter->lock);
+	if (err)
+		goto exit_unlock;
+
+	ovs_unlock();
+
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_unlock:
+	ovs_unlock();
+	nlmsg_free(reply);
+	return err;
+}
+
+static int ovs_meter_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+	struct nlattr **a = info->attrs;
+	u32 meter_id;
+	struct ovs_header *ovs_header = info->userhdr;
+	struct ovs_header *ovs_reply_header;
+	struct datapath *dp;
+	int err;
+	struct sk_buff *reply;
+	struct dp_meter *old_meter;
+
+	if (!a[OVS_METER_ATTR_ID])
+		return -EINVAL;
+	meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
+
+	reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_DEL,
+					  &ovs_reply_header);
+	if (IS_ERR(reply))
+		return PTR_ERR(reply);
+
+	ovs_lock();
+
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp) {
+		err = -ENODEV;
+		goto exit_unlock;
+	}
+
+	old_meter = lookup_meter(dp, meter_id);
+	if (old_meter) {
+		spin_lock_bh(&old_meter->lock);
+		err = ovs_meter_cmd_reply_stats(reply, meter_id, old_meter);
+		WARN_ON(err);
+		spin_unlock_bh(&old_meter->lock);
+		detach_meter(old_meter);
+	}
+	ovs_unlock();
+	ovs_meter_free(old_meter);
+	genlmsg_end(reply, ovs_reply_header);
+	return genlmsg_reply(reply, info);
+
+exit_unlock:
+	ovs_unlock();
+	nlmsg_free(reply);
+	return err;
+}
+
+/* Meter action execution.
+ *
+ * Return true 'meter_id' drop band is triggered. The 'skb' should be
+ * dropped by the caller'.
+ */
+bool ovs_meter_execute(struct datapath *dp, struct sk_buff *skb,
+		       struct sw_flow_key *key, u32 meter_id)
+{
+	struct dp_meter *meter;
+	struct dp_meter_band *band;
+	long long int now_ms = ktime_get_ns() / 1000 / 1000;
+	long long int long_delta_ms;
+	u32 delta_ms;
+	u32 cost;
+	int i, band_exceeded_max = -1;
+	u32 band_exceeded_rate = 0;
+
+	meter = lookup_meter(dp, meter_id);
+	/* Do not drop the packet when there is no meter. */
+	if (!meter)
+		return false;
+
+	/* Lock the meter while using it. */
+	spin_lock(&meter->lock);
+
+	long_delta_ms = (now_ms - meter->used); /* ms */
+
+	/* Make sure delta_ms will not be too large, so that bucket will not
+	 * wrap around below.
+	 */
+	delta_ms = (long_delta_ms > (long long int)meter->max_delta_t)
+		   ? meter->max_delta_t : (u32)long_delta_ms;
+
+	/* Update meter statistics.
+	 */
+	meter->used = now_ms;
+	meter->stats.n_packets += 1;
+	meter->stats.n_bytes += skb->len;
+
+	/* Bucket rate is either in kilobits per second, or in packets per
+	 * second.  We maintain the bucket in the units of either bits or
+	 * 1/1000th of a packet, correspondingly.
+	 * Then, when rate is multiplied with milliseconds, we get the
+	 * bucket units:
+	 * msec * kbps = bits, and
+	 * msec * packets/sec = 1/1000 packets.
+	 *
+	 * 'cost' is the number of bucket units in this packet.
+	 */
+	cost = (meter->kbps) ? skb->len * 8 : 1000;
+
+	/* Update all bands and find the one hit with the highest rate. */
+	for (i = 0; i < meter->n_bands; ++i) {
+		long long int max_bucket_size;
+
+		band = &meter->bands[i];
+		max_bucket_size = (band->burst_size + band->rate) * 1000;
+
+		band->bucket += delta_ms * band->rate;
+		if (band->bucket > max_bucket_size)
+			band->bucket = max_bucket_size;
+
+		if (band->bucket >= cost) {
+			band->bucket -= cost;
+		} else if (band->rate > band_exceeded_rate) {
+			band_exceeded_rate = band->rate;
+			band_exceeded_max = i;
+		}
+	}
+
+	if (band_exceeded_max >= 0) {
+		/* Update band statistics. */
+		band = &meter->bands[band_exceeded_max];
+		band->stats.n_packets += 1;
+		band->stats.n_bytes += skb->len;
+
+		/* Drop band triggered, let the caller drop the 'skb'.  */
+		if (band->type == OVS_METER_BAND_TYPE_DROP) {
+			spin_unlock(&meter->lock);
+			return true;
+		}
+	}
+
+	spin_unlock(&meter->lock);
+	return false;
+}
+
+static struct genl_ops dp_meter_genl_ops[] = {
+	{ .cmd = OVS_METER_CMD_FEATURES,
+		.flags = 0,		  /* OK for unprivileged users. */
+		.policy = meter_policy,
+		.doit = ovs_meter_cmd_features
+	},
+	{ .cmd = OVS_METER_CMD_SET,
+		.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
+					   *  privilege.
+					   */
+		.policy = meter_policy,
+		.doit = ovs_meter_cmd_set,
+	},
+	{ .cmd = OVS_METER_CMD_GET,
+		.flags = 0,		  /* OK for unprivileged users. */
+		.policy = meter_policy,
+		.doit = ovs_meter_cmd_get,
+	},
+	{ .cmd = OVS_METER_CMD_DEL,
+		.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
+					   *  privilege.
+					   */
+		.policy = meter_policy,
+		.doit = ovs_meter_cmd_del
+	},
+};
+
+static const struct genl_multicast_group ovs_meter_multicast_group = {
+	.name = OVS_METER_MCGROUP,
+};
+
+struct genl_family dp_meter_genl_family __ro_after_init = {
+	.hdrsize = sizeof(struct ovs_header),
+	.name = OVS_METER_FAMILY,
+	.version = OVS_METER_VERSION,
+	.maxattr = OVS_METER_ATTR_MAX,
+	.netnsok = true,
+	.parallel_ops = true,
+	.ops = dp_meter_genl_ops,
+	.n_ops = ARRAY_SIZE(dp_meter_genl_ops),
+	.mcgrps = &ovs_meter_multicast_group,
+	.n_mcgrps = 1,
+	.module = THIS_MODULE,
+};
+
+int ovs_meters_init(struct datapath *dp)
+{
+	int i;
+
+	dp->meters = kmalloc_array(METER_HASH_BUCKETS,
+				   sizeof(struct hlist_head), GFP_KERNEL);
+
+	if (!dp->meters)
+		return -ENOMEM;
+
+	for (i = 0; i < METER_HASH_BUCKETS; i++)
+		INIT_HLIST_HEAD(&dp->meters[i]);
+
+	return 0;
+}
+
+void ovs_meters_exit(struct datapath *dp)
+{
+	int i;
+
+	for (i = 0; i < METER_HASH_BUCKETS; i++) {
+		struct hlist_head *head = &dp->meters[i];
+		struct dp_meter *meter;
+		struct hlist_node *n;
+
+		hlist_for_each_entry_safe(meter, n, head, dp_hash_node)
+			kfree(meter);
+	}
+
+	kfree(dp->meters);
+}
diff --git a/net/openvswitch/meter.h b/net/openvswitch/meter.h
new file mode 100644
index 000000000000..964ace2650f8
--- /dev/null
+++ b/net/openvswitch/meter.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2017 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+
+#ifndef METER_H
+#define METER_H 1
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/openvswitch.h>
+#include <linux/genetlink.h>
+#include <linux/skbuff.h>
+
+#include "flow.h"
+struct datapath;
+
+#define DP_MAX_BANDS		1
+
+struct dp_meter_band {
+	u32 type;
+	u32 rate;
+	u32 burst_size;
+	u32 bucket; /* 1/1000 packets, or in bits */
+	struct ovs_flow_stats stats;
+};
+
+struct dp_meter {
+	spinlock_t lock;    /* Per meter lock */
+	struct rcu_head rcu;
+	struct hlist_node dp_hash_node; /*Element in datapath->meters
+					 * hash table.
+					 */
+	u32 id;
+	u16 kbps:1, keep_stats:1;
+	u16 n_bands;
+	u32 max_delta_t;
+	u64 used;
+	struct ovs_flow_stats stats;
+	struct dp_meter_band bands[];
+};
+
+extern struct genl_family dp_meter_genl_family;
+int ovs_meters_init(struct datapath *dp);
+void ovs_meters_exit(struct datapath *dp);
+bool ovs_meter_execute(struct datapath *dp, struct sk_buff *skb,
+		       struct sw_flow_key *key, u32 meter_id);
+
+#endif /* meter.h */
-- 
1.8.3.1

[net-next v2 4/4] openvswitch: Add meter action support

[Andy Zhou]

Implements OVS kernel meter action support.

Signed-off-by: Andy Zhou <azhou@ovn.org>
---
 include/uapi/linux/openvswitch.h | 3 +++
 net/openvswitch/actions.c        | 6 ++++++
 net/openvswitch/datapath.h       | 1 +
 net/openvswitch/flow_netlink.c   | 6 ++++++
 4 files changed, 16 insertions(+)

diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
index d413a2398214..de2807a9cc60 100644
--- a/include/uapi/linux/openvswitch.h
+++ b/include/uapi/linux/openvswitch.h
@@ -808,6 +808,8 @@ struct ovs_action_push_eth {
  * @OVS_ACTION_ATTR_POP_ETH: Pop the outermost Ethernet header off the
  * packet.
  * @OVS_ACTION_ATTR_CT_CLEAR: Clear conntrack state from the packet.
+ * @OVS_ACTION_ATTR_METER: Run packet through a meter, which may drop the
+ * packet, or modify the packet (e.g., change the DSCP field).
  *
  * Only a single header can be set with a single %OVS_ACTION_ATTR_SET.  Not all
  * fields within a header are modifiable, e.g. the IPv4 protocol and fragment
@@ -838,6 +840,7 @@ enum ovs_action_attr {
 	OVS_ACTION_ATTR_PUSH_ETH,     /* struct ovs_action_push_eth. */
 	OVS_ACTION_ATTR_POP_ETH,      /* No argument. */
 	OVS_ACTION_ATTR_CT_CLEAR,     /* No argument. */
+	OVS_ACTION_ATTR_METER,        /* u32 meter ID. */
 
 	__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 a551232daf61..df342fe66492 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -1214,6 +1214,12 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
 		case OVS_ACTION_ATTR_POP_ETH:
 			err = pop_eth(skb, key);
 			break;
+
+		case OVS_ACTION_ATTR_METER:
+			if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) {
+				consume_skb(skb);
+				return 0;
+			}
 		}
 
 		if (unlikely(err)) {
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index d1ffa1d9fe57..cda40c6af40a 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -30,6 +30,7 @@
 #include "conntrack.h"
 #include "flow.h"
 #include "flow_table.h"
+#include "meter.h"
 #include "vport-internal_dev.h"
 
 #define DP_MAX_PORTS           USHRT_MAX
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index dc0d79092e74..6789bb1ddf0e 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -87,6 +87,7 @@ static bool actions_may_change_flow(const struct nlattr *actions)
 		case OVS_ACTION_ATTR_SAMPLE:
 		case OVS_ACTION_ATTR_SET:
 		case OVS_ACTION_ATTR_SET_MASKED:
+		case OVS_ACTION_ATTR_METER:
 		default:
 			return true;
 		}
@@ -2533,6 +2534,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
 			[OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc),
 			[OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth),
 			[OVS_ACTION_ATTR_POP_ETH] = 0,
+			[OVS_ACTION_ATTR_METER] = sizeof(u32),
 		};
 		const struct ovs_action_push_vlan *vlan;
 		int type = nla_type(a);
@@ -2690,6 +2692,10 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
 			mac_proto = MAC_PROTO_ETHERNET;
 			break;
 
+		case OVS_ACTION_ATTR_METER:
+			/* Non-existent meters are simply ignored.  */
+			break;
+
 		default:
 			OVS_NLERR(log, "Unknown Action type %d", type);
 			return -EINVAL;
-- 
1.8.3.1

Re: [net-next v2 3/4] openvswitch: Add meter infrastructure

[Pravin Shelar]

On Tue, Oct 17, 2017 at 12:36 AM, Andy Zhou <azhou@ovn.org> wrote:
> OVS kernel datapath so far does not support Openflow meter action.
> This is the first stab at adding kernel datapath meter support.
> This implementation supports only drop band type.
>
> Signed-off-by: Andy Zhou <azhou@ovn.org>
> ---
>  net/openvswitch/Makefile   |   1 +
>  net/openvswitch/datapath.c |  14 +-
>  net/openvswitch/datapath.h |   3 +
>  net/openvswitch/meter.c    | 604 +++++++++++++++++++++++++++++++++++++++++++++
>  net/openvswitch/meter.h    |  54 ++++
>  5 files changed, 674 insertions(+), 2 deletions(-)
>  create mode 100644 net/openvswitch/meter.c
>  create mode 100644 net/openvswitch/meter.h
>
This patch mostly looks good. I have one comment below.

> +static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
> +{
> +       struct nlattr **a = info->attrs;
> +       struct dp_meter *meter, *old_meter;
> +       struct sk_buff *reply;
> +       struct ovs_header *ovs_reply_header;
> +       struct ovs_header *ovs_header = info->userhdr;
> +       struct datapath *dp;
> +       int err;
> +       u32 meter_id;
> +       bool failed;
> +
> +       meter = dp_meter_create(a);
> +       if (IS_ERR_OR_NULL(meter))
> +               return PTR_ERR(meter);
> +
> +       reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
> +                                         &ovs_reply_header);
> +       if (IS_ERR(reply)) {
> +               err = PTR_ERR(reply);
> +               goto exit_free_meter;
> +       }
> +
> +       ovs_lock();
> +       dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
> +       if (!dp) {
> +               err = -ENODEV;
> +               goto exit_unlock;
> +       }
> +
> +       if (!a[OVS_METER_ATTR_ID]) {
> +               err = -ENODEV;
> +               goto exit_unlock;
> +       }
> +
> +       meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
> +
> +       /* Cannot fail after this. */
> +       old_meter = lookup_meter(dp, meter_id);
I do not see RCU read lock taken here. This is not correctness issue
but it could cause RCU checker to spit out warning message. You could
do same trick that is done in get_dp() to avoid this issue.

Can you also test the code with rcu sparse check config option enabled?

Thanks.

Re: [net-next v2 3/4] openvswitch: Add meter infrastructure

[Pravin Shelar]

On Thu, Oct 19, 2017 at 5:58 PM, Andy Zhou <azhou@ovn.org> wrote:
>
> On Thu, Oct 19, 2017 at 02:47 Pravin Shelar <pshelar@ovn.org> wrote:
>>
>> On Tue, Oct 17, 2017 at 12:36 AM, Andy Zhou <azhou@ovn.org> wrote:
>> > OVS kernel datapath so far does not support Openflow meter action.
>> > This is the first stab at adding kernel datapath meter support.
>> > This implementation supports only drop band type.
>> >
>> > Signed-off-by: Andy Zhou <azhou@ovn.org>
>> > ---
>> >  net/openvswitch/Makefile   |   1 +
>> >  net/openvswitch/datapath.c |  14 +-
>> >  net/openvswitch/datapath.h |   3 +
>> >  net/openvswitch/meter.c    | 604
>> > +++++++++++++++++++++++++++++++++++++++++++++
>> >  net/openvswitch/meter.h    |  54 ++++
>> >  5 files changed, 674 insertions(+), 2 deletions(-)
>> >  create mode 100644 net/openvswitch/meter.c
>> >  create mode 100644 net/openvswitch/meter.h
>> >
>> This patch mostly looks good. I have one comment below.
>>
>> > +static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info
>> > *info)
>> > +{
>> > +       struct nlattr **a = info->attrs;
>> > +       struct dp_meter *meter, *old_meter;
>> > +       struct sk_buff *reply;
>> > +       struct ovs_header *ovs_reply_header;
>> > +       struct ovs_header *ovs_header = info->userhdr;
>> > +       struct datapath *dp;
>> > +       int err;
>> > +       u32 meter_id;
>> > +       bool failed;
>> > +
>> > +       meter = dp_meter_create(a);
>> > +       if (IS_ERR_OR_NULL(meter))
>> > +               return PTR_ERR(meter);
>> > +
>> > +       reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
>> > +                                         &ovs_reply_header);
>> > +       if (IS_ERR(reply)) {
>> > +               err = PTR_ERR(reply);
>> > +               goto exit_free_meter;
>> > +       }
>> > +
>> > +       ovs_lock();
>> > +       dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
>> > +       if (!dp) {
>> > +               err = -ENODEV;
>> > +               goto exit_unlock;
>> > +       }
>> > +
>> > +       if (!a[OVS_METER_ATTR_ID]) {
>> > +               err = -ENODEV;
>> > +               goto exit_unlock;
>> > +       }
>> > +
>> > +       meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
>> > +
>> > +       /* Cannot fail after this. */
>> > +       old_meter = lookup_meter(dp, meter_id);
>> I do not see RCU read lock taken here. This is not correctness issue
>> but it could cause RCU checker to spit out warning message. You could
>> do same trick that is done in get_dp() to avoid this issue.
>
> O.K.
>>
>>
>>
>> Can you also test the code with rcu sparse check config option enabled?
>
>
> Do you mean to sparse compile with CONFIG_PROVE_LOCKING and
> CONFIG_DENUG_OBJECTS_RCU_HEAD?

You could use all following options simultaneously:
CONFIG_PREEMPT
CONFIG_DEBUG_PREEMPT
CONFIG_DEBUG_SPINLOCK
CONFIG_DEBUG_ATOMIC_SLEEP
CONFIG_PROVE_RCU
CONFIG_DEBUG_OBJECTS_RCU_HEAD

Thanks,
Pravin.

Re: [net-next v2 3/4] openvswitch: Add meter infrastructure

[Andy Zhou]

On Fri, Oct 20, 2017 at 8:32 PM, Pravin Shelar <pshelar@ovn.org> wrote:
> On Thu, Oct 19, 2017 at 5:58 PM, Andy Zhou <azhou@ovn.org> wrote:
>>
>> On Thu, Oct 19, 2017 at 02:47 Pravin Shelar <pshelar@ovn.org> wrote:
>>>
>>> On Tue, Oct 17, 2017 at 12:36 AM, Andy Zhou <azhou@ovn.org> wrote:
>>> > OVS kernel datapath so far does not support Openflow meter action.
>>> > This is the first stab at adding kernel datapath meter support.
>>> > This implementation supports only drop band type.
>>> >
>>> > Signed-off-by: Andy Zhou <azhou@ovn.org>
>>> > ---
>>> >  net/openvswitch/Makefile   |   1 +
>>> >  net/openvswitch/datapath.c |  14 +-
>>> >  net/openvswitch/datapath.h |   3 +
>>> >  net/openvswitch/meter.c    | 604
>>> > +++++++++++++++++++++++++++++++++++++++++++++
>>> >  net/openvswitch/meter.h    |  54 ++++
>>> >  5 files changed, 674 insertions(+), 2 deletions(-)
>>> >  create mode 100644 net/openvswitch/meter.c
>>> >  create mode 100644 net/openvswitch/meter.h
>>> >
>>> This patch mostly looks good. I have one comment below.
>>>
>>> > +static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info
>>> > *info)
>>> > +{
>>> > +       struct nlattr **a = info->attrs;
>>> > +       struct dp_meter *meter, *old_meter;
>>> > +       struct sk_buff *reply;
>>> > +       struct ovs_header *ovs_reply_header;
>>> > +       struct ovs_header *ovs_header = info->userhdr;
>>> > +       struct datapath *dp;
>>> > +       int err;
>>> > +       u32 meter_id;
>>> > +       bool failed;
>>> > +
>>> > +       meter = dp_meter_create(a);
>>> > +       if (IS_ERR_OR_NULL(meter))
>>> > +               return PTR_ERR(meter);
>>> > +
>>> > +       reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
>>> > +                                         &ovs_reply_header);
>>> > +       if (IS_ERR(reply)) {
>>> > +               err = PTR_ERR(reply);
>>> > +               goto exit_free_meter;
>>> > +       }
>>> > +
>>> > +       ovs_lock();
>>> > +       dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
>>> > +       if (!dp) {
>>> > +               err = -ENODEV;
>>> > +               goto exit_unlock;
>>> > +       }
>>> > +
>>> > +       if (!a[OVS_METER_ATTR_ID]) {
>>> > +               err = -ENODEV;
>>> > +               goto exit_unlock;
>>> > +       }
>>> > +
>>> > +       meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
>>> > +
>>> > +       /* Cannot fail after this. */
>>> > +       old_meter = lookup_meter(dp, meter_id);
>>> I do not see RCU read lock taken here. This is not correctness issue
>>> but it could cause RCU checker to spit out warning message. You could
>>> do same trick that is done in get_dp() to avoid this issue.
>>
>> O.K.
>>>
>>>
>>>
>>> Can you also test the code with rcu sparse check config option enabled?
>>
>>
>> Do you mean to sparse compile with CONFIG_PROVE_LOCKING and
>> CONFIG_DENUG_OBJECTS_RCU_HEAD?
>
> You could use all following options simultaneously:
> CONFIG_PREEMPT
> CONFIG_DEBUG_PREEMPT
> CONFIG_DEBUG_SPINLOCK
> CONFIG_DEBUG_ATOMIC_SLEEP
> CONFIG_PROVE_RCU
> CONFIG_DEBUG_OBJECTS_RCU_HEAD

Thanks, I turned on those flags but did not get any error message. Do you
mind share the RCU checker message?

Re: [net-next v2 3/4] openvswitch: Add meter infrastructure

[Pravin Shelar]

On Thu, Nov 2, 2017 at 3:07 AM, Andy Zhou <azhou@ovn.org> wrote:
> On Fri, Oct 20, 2017 at 8:32 PM, Pravin Shelar <pshelar@ovn.org> wrote:
>> On Thu, Oct 19, 2017 at 5:58 PM, Andy Zhou <azhou@ovn.org> wrote:
>>>
>>> On Thu, Oct 19, 2017 at 02:47 Pravin Shelar <pshelar@ovn.org> wrote:
>>>>
>>>> On Tue, Oct 17, 2017 at 12:36 AM, Andy Zhou <azhou@ovn.org> wrote:
>>>> > OVS kernel datapath so far does not support Openflow meter action.
>>>> > This is the first stab at adding kernel datapath meter support.
>>>> > This implementation supports only drop band type.
>>>> >
>>>> > Signed-off-by: Andy Zhou <azhou@ovn.org>
>>>> > ---
>>>> >  net/openvswitch/Makefile   |   1 +
>>>> >  net/openvswitch/datapath.c |  14 +-
>>>> >  net/openvswitch/datapath.h |   3 +
>>>> >  net/openvswitch/meter.c    | 604
>>>> > +++++++++++++++++++++++++++++++++++++++++++++
>>>> >  net/openvswitch/meter.h    |  54 ++++
>>>> >  5 files changed, 674 insertions(+), 2 deletions(-)
>>>> >  create mode 100644 net/openvswitch/meter.c
>>>> >  create mode 100644 net/openvswitch/meter.h
>>>> >
>>>> This patch mostly looks good. I have one comment below.
>>>>
>>>> > +static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info
>>>> > *info)
>>>> > +{
>>>> > +       struct nlattr **a = info->attrs;
>>>> > +       struct dp_meter *meter, *old_meter;
>>>> > +       struct sk_buff *reply;
>>>> > +       struct ovs_header *ovs_reply_header;
>>>> > +       struct ovs_header *ovs_header = info->userhdr;
>>>> > +       struct datapath *dp;
>>>> > +       int err;
>>>> > +       u32 meter_id;
>>>> > +       bool failed;
>>>> > +
>>>> > +       meter = dp_meter_create(a);
>>>> > +       if (IS_ERR_OR_NULL(meter))
>>>> > +               return PTR_ERR(meter);
>>>> > +
>>>> > +       reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
>>>> > +                                         &ovs_reply_header);
>>>> > +       if (IS_ERR(reply)) {
>>>> > +               err = PTR_ERR(reply);
>>>> > +               goto exit_free_meter;
>>>> > +       }
>>>> > +
>>>> > +       ovs_lock();
>>>> > +       dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
>>>> > +       if (!dp) {
>>>> > +               err = -ENODEV;
>>>> > +               goto exit_unlock;
>>>> > +       }
>>>> > +
>>>> > +       if (!a[OVS_METER_ATTR_ID]) {
>>>> > +               err = -ENODEV;
>>>> > +               goto exit_unlock;
>>>> > +       }
>>>> > +
>>>> > +       meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
>>>> > +
>>>> > +       /* Cannot fail after this. */
>>>> > +       old_meter = lookup_meter(dp, meter_id);
>>>> I do not see RCU read lock taken here. This is not correctness issue
>>>> but it could cause RCU checker to spit out warning message. You could
>>>> do same trick that is done in get_dp() to avoid this issue.
>>>
>>> O.K.
>>>>
>>>>
>>>>
>>>> Can you also test the code with rcu sparse check config option enabled?
>>>
>>>
>>> Do you mean to sparse compile with CONFIG_PROVE_LOCKING and
>>> CONFIG_DENUG_OBJECTS_RCU_HEAD?
>>
>> You could use all following options simultaneously:
>> CONFIG_PREEMPT
>> CONFIG_DEBUG_PREEMPT
>> CONFIG_DEBUG_SPINLOCK
>> CONFIG_DEBUG_ATOMIC_SLEEP
>> CONFIG_PROVE_RCU
>> CONFIG_DEBUG_OBJECTS_RCU_HEAD
>
> Thanks, I turned on those flags but did not get any error message. Do you
> mind share the RCU checker message?

There would be assert failure and stack trace. so it would be pretty
obvious in kernel log messages.
Let me know if you do not see any stack trace while running meter
create, delete and execute.

Re: [net-next v2 3/4] openvswitch: Add meter infrastructure

[Andy Zhou]

On Thu, Nov 2, 2017 at 5:07 AM, Pravin Shelar <pshelar@ovn.org> wrote:
> On Thu, Nov 2, 2017 at 3:07 AM, Andy Zhou <azhou@ovn.org> wrote:
>> On Fri, Oct 20, 2017 at 8:32 PM, Pravin Shelar <pshelar@ovn.org> wrote:
>>> On Thu, Oct 19, 2017 at 5:58 PM, Andy Zhou <azhou@ovn.org> wrote:
>>>>
>>>> On Thu, Oct 19, 2017 at 02:47 Pravin Shelar <pshelar@ovn.org> wrote:
>>>>>
>>>>> On Tue, Oct 17, 2017 at 12:36 AM, Andy Zhou <azhou@ovn.org> wrote:
>>>>> > OVS kernel datapath so far does not support Openflow meter action.
>>>>> > This is the first stab at adding kernel datapath meter support.
>>>>> > This implementation supports only drop band type.
>>>>> >
>>>>> > Signed-off-by: Andy Zhou <azhou@ovn.org>
>>>>> > ---
>>>>> >  net/openvswitch/Makefile   |   1 +
>>>>> >  net/openvswitch/datapath.c |  14 +-
>>>>> >  net/openvswitch/datapath.h |   3 +
>>>>> >  net/openvswitch/meter.c    | 604
>>>>> > +++++++++++++++++++++++++++++++++++++++++++++
>>>>> >  net/openvswitch/meter.h    |  54 ++++
>>>>> >  5 files changed, 674 insertions(+), 2 deletions(-)
>>>>> >  create mode 100644 net/openvswitch/meter.c
>>>>> >  create mode 100644 net/openvswitch/meter.h
>>>>> >
>>>>> This patch mostly looks good. I have one comment below.
>>>>>
>>>>> > +static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info
>>>>> > *info)
>>>>> > +{
>>>>> > +       struct nlattr **a = info->attrs;
>>>>> > +       struct dp_meter *meter, *old_meter;
>>>>> > +       struct sk_buff *reply;
>>>>> > +       struct ovs_header *ovs_reply_header;
>>>>> > +       struct ovs_header *ovs_header = info->userhdr;
>>>>> > +       struct datapath *dp;
>>>>> > +       int err;
>>>>> > +       u32 meter_id;
>>>>> > +       bool failed;
>>>>> > +
>>>>> > +       meter = dp_meter_create(a);
>>>>> > +       if (IS_ERR_OR_NULL(meter))
>>>>> > +               return PTR_ERR(meter);
>>>>> > +
>>>>> > +       reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
>>>>> > +                                         &ovs_reply_header);
>>>>> > +       if (IS_ERR(reply)) {
>>>>> > +               err = PTR_ERR(reply);
>>>>> > +               goto exit_free_meter;
>>>>> > +       }
>>>>> > +
>>>>> > +       ovs_lock();
>>>>> > +       dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
>>>>> > +       if (!dp) {
>>>>> > +               err = -ENODEV;
>>>>> > +               goto exit_unlock;
>>>>> > +       }
>>>>> > +
>>>>> > +       if (!a[OVS_METER_ATTR_ID]) {
>>>>> > +               err = -ENODEV;
>>>>> > +               goto exit_unlock;
>>>>> > +       }
>>>>> > +
>>>>> > +       meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
>>>>> > +
>>>>> > +       /* Cannot fail after this. */
>>>>> > +       old_meter = lookup_meter(dp, meter_id);
>>>>> I do not see RCU read lock taken here. This is not correctness issue
>>>>> but it could cause RCU checker to spit out warning message. You could
>>>>> do same trick that is done in get_dp() to avoid this issue.
>>>>
>>>> O.K.
>>>>>
>>>>>
>>>>>
>>>>> Can you also test the code with rcu sparse check config option enabled?
>>>>
>>>>
>>>> Do you mean to sparse compile with CONFIG_PROVE_LOCKING and
>>>> CONFIG_DENUG_OBJECTS_RCU_HEAD?
>>>
>>> You could use all following options simultaneously:
>>> CONFIG_PREEMPT
>>> CONFIG_DEBUG_PREEMPT
>>> CONFIG_DEBUG_SPINLOCK
>>> CONFIG_DEBUG_ATOMIC_SLEEP
>>> CONFIG_PROVE_RCU
>>> CONFIG_DEBUG_OBJECTS_RCU_HEAD
>>
>> Thanks, I turned on those flags but did not get any error message. Do you
>> mind share the RCU checker message?
>
> There would be assert failure and stack trace. so it would be pretty
> obvious in kernel log messages.
> Let me know if you do not see any stack trace while running meter
> create, delete and execute.

No I did not see them.

Re: [net-next v2 3/4] openvswitch: Add meter infrastructure

[Pravin Shelar]

On Thu, Nov 2, 2017 at 7:43 PM, Andy Zhou <azhou@ovn.org> wrote:
> On Thu, Nov 2, 2017 at 5:07 AM, Pravin Shelar <pshelar@ovn.org> wrote:
>> On Thu, Nov 2, 2017 at 3:07 AM, Andy Zhou <azhou@ovn.org> wrote:
>>> On Fri, Oct 20, 2017 at 8:32 PM, Pravin Shelar <pshelar@ovn.org> wrote:
>>>> On Thu, Oct 19, 2017 at 5:58 PM, Andy Zhou <azhou@ovn.org> wrote:
>>>>>
>>>>> On Thu, Oct 19, 2017 at 02:47 Pravin Shelar <pshelar@ovn.org> wrote:
>>>>>>
>>>>>> On Tue, Oct 17, 2017 at 12:36 AM, Andy Zhou <azhou@ovn.org> wrote:
>>>>>> > OVS kernel datapath so far does not support Openflow meter action.
>>>>>> > This is the first stab at adding kernel datapath meter support.
>>>>>> > This implementation supports only drop band type.
>>>>>> >
>>>>>> > Signed-off-by: Andy Zhou <azhou@ovn.org>
>>>>>> > ---
>>>>>> >  net/openvswitch/Makefile   |   1 +
>>>>>> >  net/openvswitch/datapath.c |  14 +-
>>>>>> >  net/openvswitch/datapath.h |   3 +
>>>>>> >  net/openvswitch/meter.c    | 604
>>>>>> > +++++++++++++++++++++++++++++++++++++++++++++
>>>>>> >  net/openvswitch/meter.h    |  54 ++++
>>>>>> >  5 files changed, 674 insertions(+), 2 deletions(-)
>>>>>> >  create mode 100644 net/openvswitch/meter.c
>>>>>> >  create mode 100644 net/openvswitch/meter.h
>>>>>> >
>>>>>> This patch mostly looks good. I have one comment below.
>>>>>>
>>>>>> > +static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info
>>>>>> > *info)
>>>>>> > +{
>>>>>> > +       struct nlattr **a = info->attrs;
>>>>>> > +       struct dp_meter *meter, *old_meter;
>>>>>> > +       struct sk_buff *reply;
>>>>>> > +       struct ovs_header *ovs_reply_header;
>>>>>> > +       struct ovs_header *ovs_header = info->userhdr;
>>>>>> > +       struct datapath *dp;
>>>>>> > +       int err;
>>>>>> > +       u32 meter_id;
>>>>>> > +       bool failed;
>>>>>> > +
>>>>>> > +       meter = dp_meter_create(a);
>>>>>> > +       if (IS_ERR_OR_NULL(meter))
>>>>>> > +               return PTR_ERR(meter);
>>>>>> > +
>>>>>> > +       reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
>>>>>> > +                                         &ovs_reply_header);
>>>>>> > +       if (IS_ERR(reply)) {
>>>>>> > +               err = PTR_ERR(reply);
>>>>>> > +               goto exit_free_meter;
>>>>>> > +       }
>>>>>> > +
>>>>>> > +       ovs_lock();
>>>>>> > +       dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
>>>>>> > +       if (!dp) {
>>>>>> > +               err = -ENODEV;
>>>>>> > +               goto exit_unlock;
>>>>>> > +       }
>>>>>> > +
>>>>>> > +       if (!a[OVS_METER_ATTR_ID]) {
>>>>>> > +               err = -ENODEV;
>>>>>> > +               goto exit_unlock;
>>>>>> > +       }
>>>>>> > +
>>>>>> > +       meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
>>>>>> > +
>>>>>> > +       /* Cannot fail after this. */
>>>>>> > +       old_meter = lookup_meter(dp, meter_id);
>>>>>> I do not see RCU read lock taken here. This is not correctness issue
>>>>>> but it could cause RCU checker to spit out warning message. You could
>>>>>> do same trick that is done in get_dp() to avoid this issue.
>>>>>
>>>>> O.K.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Can you also test the code with rcu sparse check config option enabled?
>>>>>
>>>>>
>>>>> Do you mean to sparse compile with CONFIG_PROVE_LOCKING and
>>>>> CONFIG_DENUG_OBJECTS_RCU_HEAD?
>>>>
>>>> You could use all following options simultaneously:
>>>> CONFIG_PREEMPT
>>>> CONFIG_DEBUG_PREEMPT
>>>> CONFIG_DEBUG_SPINLOCK
>>>> CONFIG_DEBUG_ATOMIC_SLEEP
>>>> CONFIG_PROVE_RCU
>>>> CONFIG_DEBUG_OBJECTS_RCU_HEAD
>>>
>>> Thanks, I turned on those flags but did not get any error message. Do you
>>> mind share the RCU checker message?
>>
>> There would be assert failure and stack trace. so it would be pretty
>> obvious in kernel log messages.
>> Let me know if you do not see any stack trace while running meter
>> create, delete and execute.
>
> No I did not see them.
ok, Can you send out patch against latest net-next?