thr3ads.net - Linux Ethernet Bridging - [Bridge] [PATCH net-next v5 00/10] net: bridge: cfm: Add support for Connectivity Fault Management(CFM) [Oct 2020]

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Henrik Bjoernlund

2020-Oct-12 14:04 UTC

[Bridge] [PATCH net-next v5 00/10] net: bridge: cfm: Add support for Connectivity Fault Management(CFM)

Connectivity Fault Management (CFM) is defined in 802.1Q section 12.14.

Connectivity Fault Management (CFM) comprises capabilities for detecting,
verifying,
and isolating connectivity failures in Virtual Bridged Networks.
These capabilities can be used in networks operated by multiple independent
organizations,
each with restricted management access to each other?s equipment.

CFM functions are partitioned as follows:
    ? Path discovery
    ? Fault detection
    ? Fault verification and isolation
    ? Fault notification
    ? Fault recovery

The primary CFM protocol shims are called Maintenance Points (MPs).
A MP can be either a MEP or a MHF.
The MEP:
    -It is the Maintenance association End Point
     described in 802.1Q section 19.2.
    -It is created on a specific level (1-7) and is assuring
     that no CFM frames are passing through this MEP on lower levels.
    -It initiates and terminates/validates CFM frames on its level.
    -It can only exist on a port that is related to a bridge.
The MHF:
    -It is the Maintenance Domain Intermediate Point
     (MIP) Half Function (MHF) described in 802.1Q section 19.3.
    -It is created on a specific level (1-7).
    -It is extracting/injecting certain CFM frame on this level.
    -It can only exist on a port that is related to a bridge.
    -Currently not supported.

There are defined the following CFM protocol functions:
    -Continuity Check
    -Loopback. Currently not supported.
    -Linktrace. Currently not supported.

This CFM component supports create/delete of MEP instances and configuration of
the different CFM protocols. Also status information can be fetched and
delivered
through notification due to defect status change.

The user interacts with CFM using the 'cfm' user space client program,
the client talks with the kernel using netlink.

Any notification emitted by CFM from the kernel can be monitored in user space
by starting 'cfm_server' program.

Currently this 'cfm' and 'cfm_server' programs are standalone
placed in a cfm
repository https://github.com/microchip-ung/cfm but it is considered to
integrate
this into 'iproute2'.

v1 -> v2
    Added the CFM switchdev interface and also added utilization by calling the
    interface from the kernel CFM implementation trying to offload CFM
functionality
    to HW. This offload (CFM driver) is currently not implemented.
    
    Corrections based on RCF comments:
        -The single CFM kernel implementation Patch is broken up into three
patches.
        -Changed the list of MEP instances from list_head to hlist_head.
        -Removed unnecessary RCU list traversing.
        -Solved RCU unlocking problem.
        -Removed unnecessary comments.
        -Added ASSERT_RTNL() where required.
        -Shaping up on error messages.
        -Correction NETLINK br_fill_ifinfo() to be able to handle
'filter_mask'
         with multiple flags asserted.

v2 -> v3
    The switchdev definition and utilization has been removed as there was no
    switchdev implementation.
    Some compiling issues are fixed as Reported-by: kernel test robot <lkp at
intel.com>.

v3 -> v4
    Fixed potential crash during hlist walk where elements are removed.
    Giving all commits unique titles.
    NETLINK implementation split into three commits.
    Commit "bridge: cfm: Bridge port remove" is merged with
    commit "bridge: cfm: Kernel space implementation of CFM. MEP
create/delete."

v4 -> v5
    Reordered members in struct net_bridge to bring member frame_type_list to
the
    first cache line.
    Helper functions nla_get_mac() and nla_get_maid() are removed.
    The NLA_POLICY_NESTED() macro is used to initialize the br_cfm_policy array.
    Fixed reverse xmas tree.

Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>

Henrik Bjoernlund (10):
  net: bridge: extend the process of special frames
  bridge: cfm: Add BRIDGE_CFM to Kconfig.
  bridge: uapi: cfm: Added EtherType used by the CFM protocol.
  bridge: cfm: Kernel space implementation of CFM. MEP create/delete.
  bridge: cfm: Kernel space implementation of CFM. CCM frame TX added.
  bridge: cfm: Kernel space implementation of CFM. CCM frame RX added.
  bridge: cfm: Netlink SET configuration Interface.
  bridge: cfm: Netlink GET configuration Interface.
  bridge: cfm: Netlink GET status Interface.
  bridge: cfm: Netlink Notifications.

 include/uapi/linux/cfm_bridge.h |  70 +++
 include/uapi/linux/if_bridge.h  | 125 +++++
 include/uapi/linux/if_ether.h   |   1 +
 include/uapi/linux/rtnetlink.h  |   2 +
 net/bridge/Kconfig              |  11 +
 net/bridge/Makefile             |   2 +
 net/bridge/br_cfm.c             | 884 ++++++++++++++++++++++++++++++++
 net/bridge/br_cfm_netlink.c     | 726 ++++++++++++++++++++++++++
 net/bridge/br_device.c          |   4 +
 net/bridge/br_if.c              |   1 +
 net/bridge/br_input.c           |  33 +-
 net/bridge/br_mrp.c             |  19 +-
 net/bridge/br_netlink.c         | 115 ++++-
 net/bridge/br_private.h         |  77 ++-
 net/bridge/br_private_cfm.h     | 147 ++++++
 15 files changed, 2194 insertions(+), 23 deletions(-)
 create mode 100644 include/uapi/linux/cfm_bridge.h
 create mode 100644 net/bridge/br_cfm.c
 create mode 100644 net/bridge/br_cfm_netlink.c
 create mode 100644 net/bridge/br_private_cfm.h

-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 01/10] net: bridge: extend the process of special frames

This patch extends the processing of frames in the bridge. Currently MRP
frames needs special processing and the current implementation doesn't
allow a nice way to process different frame types. Therefore try to
improve this by adding a list that contains frame types that need
special processing. This list is iterated for each input frame and if
there is a match based on frame type then these functions will be called
and decide what to do with the frame. It can process the frame then the
bridge doesn't need to do anything or don't process so then the bridge
will do normal forwarding.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
---
 net/bridge/br_device.c  |  1 +
 net/bridge/br_input.c   | 33 ++++++++++++++++++++++++++++++++-
 net/bridge/br_mrp.c     | 19 +++++++++++++++----
 net/bridge/br_private.h | 19 ++++++++++++-------
 4 files changed, 60 insertions(+), 12 deletions(-)

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 9a2fb4aa1a10..206c4ba51cd2 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -473,6 +473,7 @@ void br_dev_setup(struct net_device *dev)
 	spin_lock_init(&br->lock);
 	INIT_LIST_HEAD(&br->port_list);
 	INIT_HLIST_HEAD(&br->fdb_list);
+	INIT_HLIST_HEAD(&br->frame_type_list);
 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 	INIT_LIST_HEAD(&br->mrp_list);
 #endif
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 59a318b9f646..bece03bf83c4 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -254,6 +254,21 @@ static int nf_hook_bridge_pre(struct sk_buff *skb, struct
sk_buff **pskb)
 	return RX_HANDLER_CONSUMED;
 }
 
+/* Return 0 if the frame was not processed otherwise 1
+ * note: already called with rcu_read_lock
+ */
+static int br_process_frame_type(struct net_bridge_port *p,
+				 struct sk_buff *skb)
+{
+	struct br_frame_type *tmp;
+
+	hlist_for_each_entry_rcu(tmp, &p->br->frame_type_list, list)
+		if (unlikely(tmp->type == skb->protocol))
+			return tmp->frame_handler(p, skb);
+
+	return 0;
+}
+
 /*
  * Return NULL if skb is handled
  * note: already called with rcu_read_lock
@@ -343,7 +358,7 @@ static rx_handler_result_t br_handle_frame(struct sk_buff
**pskb)
 		}
 	}
 
-	if (unlikely(br_mrp_process(p, skb)))
+	if (unlikely(br_process_frame_type(p, skb)))
 		return RX_HANDLER_PASS;
 
 forward:
@@ -380,3 +395,19 @@ rx_handler_func_t *br_get_rx_handler(const struct
net_device *dev)
 
 	return br_handle_frame;
 }
+
+void br_add_frame(struct net_bridge *br, struct br_frame_type *ft)
+{
+	hlist_add_head_rcu(&ft->list, &br->frame_type_list);
+}
+
+void br_del_frame(struct net_bridge *br, struct br_frame_type *ft)
+{
+	struct br_frame_type *tmp;
+
+	hlist_for_each_entry(tmp, &br->frame_type_list, list)
+		if (ft == tmp) {
+			hlist_del_rcu(&ft->list);
+			return;
+		}
+}
diff --git a/net/bridge/br_mrp.c b/net/bridge/br_mrp.c
index b36689e6e7cb..f94d72bb7c32 100644
--- a/net/bridge/br_mrp.c
+++ b/net/bridge/br_mrp.c
@@ -6,6 +6,13 @@
 static const u8 mrp_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x1 };
 static const u8 mrp_in_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x3
};
 
+static int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
+
+static struct br_frame_type mrp_frame_type __read_mostly = {
+	.type = cpu_to_be16(ETH_P_MRP),
+	.frame_handler = br_mrp_process,
+};
+
 static bool br_mrp_is_ring_port(struct net_bridge_port *p_port,
 				struct net_bridge_port *s_port,
 				struct net_bridge_port *port)
@@ -445,6 +452,9 @@ static void br_mrp_del_impl(struct net_bridge *br, struct
br_mrp *mrp)
 
 	list_del_rcu(&mrp->list);
 	kfree_rcu(mrp, rcu);
+
+	if (list_empty(&br->mrp_list))
+		br_del_frame(br, &mrp_frame_type);
 }
 
 /* Adds a new MRP instance.
@@ -493,6 +503,9 @@ int br_mrp_add(struct net_bridge *br, struct br_mrp_instance
*instance)
 	spin_unlock_bh(&br->lock);
 	rcu_assign_pointer(mrp->s_port, p);
 
+	if (list_empty(&br->mrp_list))
+		br_add_frame(br, &mrp_frame_type);
+
 	INIT_DELAYED_WORK(&mrp->test_work, br_mrp_test_work_expired);
 	INIT_DELAYED_WORK(&mrp->in_test_work, br_mrp_in_test_work_expired);
 	list_add_tail_rcu(&mrp->list, &br->mrp_list);
@@ -1172,15 +1185,13 @@ static int br_mrp_rcv(struct net_bridge_port *p,
  * normal forwarding.
  * note: already called with rcu_read_lock
  */
-int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
+static int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
 {
 	/* If there is no MRP instance do normal forwarding */
 	if (likely(!(p->flags & BR_MRP_AWARE)))
 		goto out;
 
-	if (unlikely(skb->protocol == htons(ETH_P_MRP)))
-		return br_mrp_rcv(p, skb, p->dev);
-
+	return br_mrp_rcv(p, skb, p->dev);
 out:
 	return 0;
 }
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 345118e35c42..2fe8b88d090e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -383,7 +383,7 @@ enum net_bridge_opts {
 struct net_bridge {
 	spinlock_t			lock;
 	spinlock_t			hash_lock;
-	struct list_head		port_list;
+	struct hlist_head		frame_type_list;
 	struct net_device		*dev;
 	struct pcpu_sw_netstats		__percpu *stats;
 	unsigned long			options;
@@ -395,6 +395,7 @@ struct net_bridge {
 #endif
 
 	struct rhashtable		fdb_hash_tbl;
+	struct list_head		port_list;
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 	union {
 		struct rtable		fake_rtable;
@@ -755,6 +756,16 @@ int nbp_backup_change(struct net_bridge_port *p, struct
net_device *backup_dev);
 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff
*skb);
 rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
 
+struct br_frame_type {
+	__be16			type;
+	int			(*frame_handler)(struct net_bridge_port *port,
+						 struct sk_buff *skb);
+	struct hlist_node	list;
+};
+
+void br_add_frame(struct net_bridge *br, struct br_frame_type *ft);
+void br_del_frame(struct net_bridge *br, struct br_frame_type *ft);
+
 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 {
 	return rcu_dereference(dev->rx_handler) == br_get_rx_handler(dev);
@@ -1417,7 +1428,6 @@ extern int (*br_fdb_test_addr_hook)(struct net_device
*dev, unsigned char *addr)
 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
 		 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
-int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
 bool br_mrp_enabled(struct net_bridge *br);
 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p);
 int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br);
@@ -1429,11 +1439,6 @@ static inline int br_mrp_parse(struct net_bridge *br,
struct net_bridge_port *p,
 	return -EOPNOTSUPP;
 }
 
-static inline int br_mrp_process(struct net_bridge_port *p, struct sk_buff
*skb)
-{
-	return 0;
-}
-
 static inline bool br_mrp_enabled(struct net_bridge *br)
 {
 	return false;
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 02/10] bridge: cfm: Add BRIDGE_CFM to Kconfig.

This makes it possible to include or exclude the CFM
protocol according to 802.1Q section 12.14.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay at nvidia.com>
---
 net/bridge/Kconfig      | 11 +++++++++++
 net/bridge/br_device.c  |  3 +++
 net/bridge/br_private.h |  3 +++
 3 files changed, 17 insertions(+)

diff --git a/net/bridge/Kconfig b/net/bridge/Kconfig
index 80879196560c..3c8ded7d3e84 100644
--- a/net/bridge/Kconfig
+++ b/net/bridge/Kconfig
@@ -73,3 +73,14 @@ config BRIDGE_MRP
 	  Say N to exclude this support and reduce the binary size.
 
 	  If unsure, say N.
+
+config BRIDGE_CFM
+	bool "CFM protocol"
+	depends on BRIDGE
+	help
+	  If you say Y here, then the Ethernet bridge will be able to run CFM
+	  protocol according to 802.1Q section 12.14
+
+	  Say N to exclude this support and reduce the binary size.
+
+	  If unsure, say N.
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 206c4ba51cd2..2a3b316f32eb 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -476,6 +476,9 @@ void br_dev_setup(struct net_device *dev)
 	INIT_HLIST_HEAD(&br->frame_type_list);
 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 	INIT_LIST_HEAD(&br->mrp_list);
+#endif
+#if IS_ENABLED(CONFIG_BRIDGE_CFM)
+	INIT_HLIST_HEAD(&br->mep_list);
 #endif
 	spin_lock_init(&br->hash_lock);
 
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 2fe8b88d090e..90ead48fa762 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -484,6 +484,9 @@ struct net_bridge {
 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 	struct list_head		mrp_list;
 #endif
+#if IS_ENABLED(CONFIG_BRIDGE_CFM)
+	struct hlist_head		mep_list;
+#endif
 };
 
 struct br_input_skb_cb {
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 03/10] bridge: uapi: cfm: Added EtherType used by the CFM protocol.

This EtherType is used by all CFM protocal frames transmitted
according to 802.1Q section 12.14.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay at nvidia.com>
---
 include/uapi/linux/if_ether.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index d6de2b167448..a0b637911d3c 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -99,6 +99,7 @@
 #define ETH_P_1588	0x88F7		/* IEEE 1588 Timesync */
 #define ETH_P_NCSI	0x88F8		/* NCSI protocol		*/
 #define ETH_P_PRP	0x88FB		/* IEC 62439-3 PRP/HSRv0	*/
+#define ETH_P_CFM	0x8902		/* Connectivity Fault Management */
 #define ETH_P_FCOE	0x8906		/* Fibre Channel over Ethernet  */
 #define ETH_P_IBOE	0x8915		/* Infiniband over Ethernet	*/
 #define ETH_P_TDLS	0x890D          /* TDLS */
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 04/10] bridge: cfm: Kernel space implementation of CFM. MEP create/delete.

This is the first commit of the implementation of the CFM protocol
according to 802.1Q section 12.14.

It contains MEP instance create, delete and configuration.

Connectivity Fault Management (CFM) comprises capabilities for
detecting, verifying, and isolating connectivity failures in
Virtual Bridged Networks. These capabilities can be used in
networks operated by multiple independent organizations, each
with restricted management access to each other<E2><80><99>s
equipment.

CFM functions are partitioned as follows:
    - Path discovery
    - Fault detection
    - Fault verification and isolation
    - Fault notification
    - Fault recovery

Interface consists of these functions:
br_cfm_mep_create()
br_cfm_mep_delete()
br_cfm_mep_config_set()
br_cfm_cc_config_set()
br_cfm_cc_peer_mep_add()
br_cfm_cc_peer_mep_remove()

A MEP instance is created by br_cfm_mep_create()
    -It is the Maintenance association End Point
     described in 802.1Q section 19.2.
    -It is created on a specific level (1-7) and is assuring
     that no CFM frames are passing through this MEP on lower levels.
    -It initiates and validates CFM frames on its level.
    -It can only exist on a port that is related to a bridge.
    -Attributes given cannot be changed until the instance is
     deleted.

A MEP instance can be deleted by br_cfm_mep_delete().

A created MEP instance has attributes that can be
configured by br_cfm_mep_config_set().

A MEP Continuity Check feature can be configured by
br_cfm_cc_config_set()
    The Continuity Check Receiver state machine can be
    enabled and disabled.
    According to 802.1Q section 19.2.8

A MEP can have Peer MEPs added and removed by
br_cfm_cc_peer_mep_add() and br_cfm_cc_peer_mep_remove()
    The Continuity Check feature can maintain connectivity
    status on each added Peer MEP.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay at nvidia.com>
---
 include/uapi/linux/cfm_bridge.h |  23 +++
 net/bridge/Makefile             |   2 +
 net/bridge/br_cfm.c             | 278 ++++++++++++++++++++++++++++++++
 net/bridge/br_if.c              |   1 +
 net/bridge/br_private.h         |  10 ++
 net/bridge/br_private_cfm.h     |  61 +++++++
 6 files changed, 375 insertions(+)
 create mode 100644 include/uapi/linux/cfm_bridge.h
 create mode 100644 net/bridge/br_cfm.c
 create mode 100644 net/bridge/br_private_cfm.h

diff --git a/include/uapi/linux/cfm_bridge.h b/include/uapi/linux/cfm_bridge.h
new file mode 100644
index 000000000000..a262a8c0e085
--- /dev/null
+++ b/include/uapi/linux/cfm_bridge.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+
+#ifndef _UAPI_LINUX_CFM_BRIDGE_H_
+#define _UAPI_LINUX_CFM_BRIDGE_H_
+
+#include <linux/types.h>
+#include <linux/if_ether.h>
+
+#define CFM_MAID_LENGTH		48
+
+/* MEP domain */
+enum br_cfm_domain {
+	BR_CFM_PORT,
+	BR_CFM_VLAN,
+};
+
+/* MEP direction */
+enum br_cfm_mep_direction {
+	BR_CFM_MEP_DIRECTION_DOWN,
+	BR_CFM_MEP_DIRECTION_UP,
+};
+
+#endif
diff --git a/net/bridge/Makefile b/net/bridge/Makefile
index ccb394236fbd..ddc0a9192348 100644
--- a/net/bridge/Makefile
+++ b/net/bridge/Makefile
@@ -27,3 +27,5 @@ bridge-$(CONFIG_NET_SWITCHDEV) += br_switchdev.o
 obj-$(CONFIG_NETFILTER) += netfilter/
 
 bridge-$(CONFIG_BRIDGE_MRP)	+= br_mrp_switchdev.o br_mrp.o br_mrp_netlink.o
+
+bridge-$(CONFIG_BRIDGE_CFM)	+= br_cfm.o
diff --git a/net/bridge/br_cfm.c b/net/bridge/br_cfm.c
new file mode 100644
index 000000000000..d171f69a7f30
--- /dev/null
+++ b/net/bridge/br_cfm.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/cfm_bridge.h>
+#include <uapi/linux/cfm_bridge.h>
+#include "br_private_cfm.h"
+
+static struct br_cfm_mep *br_mep_find(struct net_bridge *br, u32 instance)
+{
+	struct br_cfm_mep *mep;
+
+	hlist_for_each_entry(mep, &br->mep_list, head)
+		if (mep->instance == instance)
+			return mep;
+
+	return NULL;
+}
+
+static struct br_cfm_mep *br_mep_find_ifindex(struct net_bridge *br,
+					      u32 ifindex)
+{
+	struct br_cfm_mep *mep;
+
+	hlist_for_each_entry_rcu(mep, &br->mep_list, head,
+				 lockdep_rtnl_is_held())
+		if (mep->create.ifindex == ifindex)
+			return mep;
+
+	return NULL;
+}
+
+static struct br_cfm_peer_mep *br_peer_mep_find(struct br_cfm_mep *mep,
+						u32 mepid)
+{
+	struct br_cfm_peer_mep *peer_mep;
+
+	hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head,
+				 lockdep_rtnl_is_held())
+		if (peer_mep->mepid == mepid)
+			return peer_mep;
+
+	return NULL;
+}
+
+static struct net_bridge_port *br_mep_get_port(struct net_bridge *br,
+					       u32 ifindex)
+{
+	struct net_bridge_port *port;
+
+	list_for_each_entry(port, &br->port_list, list)
+		if (port->dev->ifindex == ifindex)
+			return port;
+
+	return NULL;
+}
+
+int br_cfm_mep_create(struct net_bridge *br,
+		      const u32 instance,
+		      struct br_cfm_mep_create *const create,
+		      struct netlink_ext_ack *extack)
+{
+	struct net_bridge_port *p;
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	if (create->domain == BR_CFM_VLAN) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "VLAN domain not supported");
+		return -EINVAL;
+	}
+	if (create->domain != BR_CFM_PORT) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Invalid domain value");
+		return -EINVAL;
+	}
+	if (create->direction == BR_CFM_MEP_DIRECTION_UP) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Up-MEP not supported");
+		return -EINVAL;
+	}
+	if (create->direction != BR_CFM_MEP_DIRECTION_DOWN) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Invalid direction value");
+		return -EINVAL;
+	}
+	p = br_mep_get_port(br, create->ifindex);
+	if (!p) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Port is not related to bridge");
+		return -EINVAL;
+	}
+	mep = br_mep_find(br, instance);
+	if (mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP instance already exists");
+		return -EEXIST;
+	}
+
+	/* In PORT domain only one instance can be created per port */
+	if (create->domain == BR_CFM_PORT) {
+		mep = br_mep_find_ifindex(br, create->ifindex);
+		if (mep) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Only one Port MEP on a port allowed");
+			return -EINVAL;
+		}
+	}
+
+	mep = kzalloc(sizeof(*mep), GFP_KERNEL);
+	if (!mep)
+		return -ENOMEM;
+
+	mep->create = *create;
+	mep->instance = instance;
+	rcu_assign_pointer(mep->b_port, p);
+
+	INIT_HLIST_HEAD(&mep->peer_mep_list);
+
+	hlist_add_tail_rcu(&mep->head, &br->mep_list);
+
+	return 0;
+}
+
+static void mep_delete_implementation(struct net_bridge *br,
+				      struct br_cfm_mep *mep)
+{
+	struct br_cfm_peer_mep *peer_mep;
+	struct hlist_node *n_store;
+
+	ASSERT_RTNL();
+
+	/* Empty and free peer MEP list */
+	hlist_for_each_entry_safe(peer_mep, n_store, &mep->peer_mep_list, head)
{
+		hlist_del_rcu(&peer_mep->head);
+		kfree_rcu(peer_mep, rcu);
+	}
+
+	RCU_INIT_POINTER(mep->b_port, NULL);
+	hlist_del_rcu(&mep->head);
+	kfree_rcu(mep, rcu);
+}
+
+int br_cfm_mep_delete(struct net_bridge *br,
+		      const u32 instance,
+		      struct netlink_ext_ack *extack)
+{
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	mep = br_mep_find(br, instance);
+	if (!mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP instance does not exists");
+		return -ENOENT;
+	}
+
+	mep_delete_implementation(br, mep);
+
+	return 0;
+}
+
+int br_cfm_mep_config_set(struct net_bridge *br,
+			  const u32 instance,
+			  const struct br_cfm_mep_config *const config,
+			  struct netlink_ext_ack *extack)
+{
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	if (config->mdlevel > 7) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MD level is invalid");
+		return -EINVAL;
+	}
+	/* The MEP-ID is a 13 bit field in the CCM PDU identifying the MEP */
+	if (config->mepid > 0x1FFF) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP-ID is invalid");
+		return -EINVAL;
+	}
+
+	mep = br_mep_find(br, instance);
+	if (!mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP instance does not exists");
+		return -ENOENT;
+	}
+
+	mep->config = *config;
+
+	return 0;
+}
+
+int br_cfm_cc_peer_mep_add(struct net_bridge *br, const u32 instance,
+			   u32 mepid,
+			   struct netlink_ext_ack *extack)
+{
+	struct br_cfm_peer_mep *peer_mep;
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	mep = br_mep_find(br, instance);
+	if (!mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP instance does not exists");
+		return -ENOENT;
+	}
+	/* The MEP-ID is a 13 bit field in the CCM PDU identifying the MEP */
+	if (mepid > 0x1FFF) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP-ID is invalid");
+		return -EINVAL;
+	}
+
+	peer_mep = br_peer_mep_find(mep, mepid);
+	if (peer_mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Peer MEP-ID already exists");
+		return -EEXIST;
+	}
+
+	peer_mep = kzalloc(sizeof(*peer_mep), GFP_KERNEL);
+	if (!peer_mep)
+		return -ENOMEM;
+
+	peer_mep->mepid = mepid;
+	peer_mep->mep = mep;
+
+	hlist_add_tail_rcu(&peer_mep->head, &mep->peer_mep_list);
+
+	return 0;
+}
+
+int br_cfm_cc_peer_mep_remove(struct net_bridge *br, const u32 instance,
+			      u32 mepid,
+			      struct netlink_ext_ack *extack)
+{
+	struct br_cfm_peer_mep *peer_mep;
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	mep = br_mep_find(br, instance);
+	if (!mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP instance does not exists");
+		return -ENOENT;
+	}
+
+	peer_mep = br_peer_mep_find(mep, mepid);
+	if (!peer_mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Peer MEP-ID does not exists");
+		return -ENOENT;
+	}
+
+	hlist_del_rcu(&peer_mep->head);
+	kfree_rcu(peer_mep, rcu);
+
+	return 0;
+}
+
+/* Deletes the CFM instances on a specific bridge port
+ */
+void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *port)
+{
+	struct hlist_node *n_store;
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	hlist_for_each_entry_safe(mep, n_store, &br->mep_list, head)
+		if (mep->create.ifindex == port->dev->ifindex)
+			mep_delete_implementation(br, mep);
+}
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index a0e9a7937412..f7d2f472ae24 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -334,6 +334,7 @@ static void del_nbp(struct net_bridge_port *p)
 	spin_unlock_bh(&br->lock);
 
 	br_mrp_port_del(br, p);
+	br_cfm_port_del(br, p);
 
 	br_ifinfo_notify(RTM_DELLINK, NULL, p);
 
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 90ead48fa762..f7c41380de4d 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1459,6 +1459,16 @@ static inline int br_mrp_fill_info(struct sk_buff *skb,
struct net_bridge *br)
 
 #endif
 
+/* br_mrp.c */
+#if IS_ENABLED(CONFIG_BRIDGE_CFM)
+void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *p);
+#else
+static inline void br_cfm_port_del(struct net_bridge *br,
+				   struct net_bridge_port *p)
+{
+}
+#endif
+
 /* br_netlink.c */
 extern struct rtnl_link_ops br_link_ops;
 int br_netlink_init(void);
diff --git a/net/bridge/br_private_cfm.h b/net/bridge/br_private_cfm.h
new file mode 100644
index 000000000000..40fe982added
--- /dev/null
+++ b/net/bridge/br_private_cfm.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef _BR_PRIVATE_CFM_H_
+#define _BR_PRIVATE_CFM_H_
+
+#include "br_private.h"
+#include <uapi/linux/cfm_bridge.h>
+
+struct br_cfm_mep_create {
+	enum br_cfm_domain domain; /* Domain for this MEP */
+	enum br_cfm_mep_direction direction; /* Up or Down MEP direction */
+	u32 ifindex; /* Residence port */
+};
+
+int br_cfm_mep_create(struct net_bridge *br,
+		      const u32 instance,
+		      struct br_cfm_mep_create *const create,
+		      struct netlink_ext_ack *extack);
+
+int br_cfm_mep_delete(struct net_bridge *br,
+		      const u32 instance,
+		      struct netlink_ext_ack *extack);
+
+struct br_cfm_mep_config {
+	u32 mdlevel;
+	u32 mepid; /* MEPID for this MEP */
+	struct mac_addr unicast_mac; /* The MEP unicast MAC */
+};
+
+int br_cfm_mep_config_set(struct net_bridge *br,
+			  const u32 instance,
+			  const struct br_cfm_mep_config *const config,
+			  struct netlink_ext_ack *extack);
+
+int br_cfm_cc_peer_mep_add(struct net_bridge *br, const u32 instance,
+			   u32 peer_mep_id,
+			   struct netlink_ext_ack *extack);
+int br_cfm_cc_peer_mep_remove(struct net_bridge *br, const u32 instance,
+			      u32 peer_mep_id,
+			      struct netlink_ext_ack *extack);
+
+struct br_cfm_mep {
+	/* list header of MEP instances */
+	struct hlist_node		head;
+	u32				instance;
+	struct br_cfm_mep_create	create;
+	struct br_cfm_mep_config	config;
+	/* List of multiple peer MEPs */
+	struct hlist_head		peer_mep_list;
+	struct net_bridge_port __rcu	*b_port;
+	struct rcu_head			rcu;
+};
+
+struct br_cfm_peer_mep {
+	struct hlist_node		head;
+	struct br_cfm_mep		*mep;
+	u32				mepid;
+	struct rcu_head			rcu;
+};
+
+#endif /* _BR_PRIVATE_CFM_H_ */
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 05/10] bridge: cfm: Kernel space implementation of CFM. CCM frame TX added.

This is the second commit of the implementation of the CFM protocol
according to 802.1Q section 12.14.

Functionality is extended with CCM frame transmission.

Interface is extended with these functions:
br_cfm_cc_rdi_set()
br_cfm_cc_ccm_tx()
br_cfm_cc_config_set()

A MEP Continuity Check feature can be configured by
br_cfm_cc_config_set()
    The Continuity Check parameters can be configured to be used when
    transmitting CCM.

A MEP can be configured to start or stop transmission of CCM frames by
br_cfm_cc_ccm_tx()
    The CCM will be transmitted for a selected period in seconds.
    Must call this function before timeout to keep transmission alive.

A MEP transmitting CCM can be configured with inserted RDI in PDU by
br_cfm_cc_rdi_set()

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay at nvidia.com>
---
 include/uapi/linux/cfm_bridge.h |  39 ++++-
 net/bridge/br_cfm.c             | 284 ++++++++++++++++++++++++++++++++
 net/bridge/br_private_cfm.h     |  54 ++++++
 3 files changed, 376 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/cfm_bridge.h b/include/uapi/linux/cfm_bridge.h
index a262a8c0e085..84a3817da90b 100644
--- a/include/uapi/linux/cfm_bridge.h
+++ b/include/uapi/linux/cfm_bridge.h
@@ -6,7 +6,32 @@
 #include <linux/types.h>
 #include <linux/if_ether.h>
 
-#define CFM_MAID_LENGTH		48
+#define ETHER_HEADER_LENGTH		(6+6+4+2)
+#define CFM_MAID_LENGTH			48
+#define CFM_CCM_PDU_LENGTH		75
+#define CFM_PORT_STATUS_TLV_LENGTH	4
+#define CFM_IF_STATUS_TLV_LENGTH	4
+#define CFM_IF_STATUS_TLV_TYPE		4
+#define CFM_PORT_STATUS_TLV_TYPE	2
+#define CFM_ENDE_TLV_TYPE		0
+#define CFM_CCM_MAX_FRAME_LENGTH	(ETHER_HEADER_LENGTH+\
+					 CFM_CCM_PDU_LENGTH+\
+					 CFM_PORT_STATUS_TLV_LENGTH+\
+					 CFM_IF_STATUS_TLV_LENGTH)
+#define CFM_FRAME_PRIO			7
+#define CFM_CCM_TLV_OFFSET		70
+#define CFM_CCM_ITU_RESERVED_SIZE	16
+
+struct br_cfm_common_hdr {
+	__u8 mdlevel_version;
+	__u8 opcode;
+	__u8 flags;
+	__u8 tlv_offset;
+};
+
+enum br_cfm_opcodes {
+	BR_CFM_OPCODE_CCM = 0x1,
+};
 
 /* MEP domain */
 enum br_cfm_domain {
@@ -20,4 +45,16 @@ enum br_cfm_mep_direction {
 	BR_CFM_MEP_DIRECTION_UP,
 };
 
+/* CCM interval supported. */
+enum br_cfm_ccm_interval {
+	BR_CFM_CCM_INTERVAL_NONE,
+	BR_CFM_CCM_INTERVAL_3_3_MS,
+	BR_CFM_CCM_INTERVAL_10_MS,
+	BR_CFM_CCM_INTERVAL_100_MS,
+	BR_CFM_CCM_INTERVAL_1_SEC,
+	BR_CFM_CCM_INTERVAL_10_SEC,
+	BR_CFM_CCM_INTERVAL_1_MIN,
+	BR_CFM_CCM_INTERVAL_10_MIN,
+};
+
 #endif
diff --git a/net/bridge/br_cfm.c b/net/bridge/br_cfm.c
index d171f69a7f30..4b7af1adcd6a 100644
--- a/net/bridge/br_cfm.c
+++ b/net/bridge/br_cfm.c
@@ -53,6 +53,184 @@ static struct net_bridge_port *br_mep_get_port(struct
net_bridge *br,
 	return NULL;
 }
 
+/* Calculate the CCM interval in us. */
+static u32 interval_to_us(enum br_cfm_ccm_interval interval)
+{
+	switch (interval) {
+	case BR_CFM_CCM_INTERVAL_NONE:
+		return 0;
+	case BR_CFM_CCM_INTERVAL_3_3_MS:
+		return 3300;
+	case BR_CFM_CCM_INTERVAL_10_MS:
+		return 10 * 1000;
+	case BR_CFM_CCM_INTERVAL_100_MS:
+		return 100 * 1000;
+	case BR_CFM_CCM_INTERVAL_1_SEC:
+		return 1000 * 1000;
+	case BR_CFM_CCM_INTERVAL_10_SEC:
+		return 10 * 1000 * 1000;
+	case BR_CFM_CCM_INTERVAL_1_MIN:
+		return 60 * 1000 * 1000;
+	case BR_CFM_CCM_INTERVAL_10_MIN:
+		return 10 * 60 * 1000 * 1000;
+	}
+	return 0;
+}
+
+/* Convert the interface interval to CCM PDU value. */
+static u32 interval_to_pdu(enum br_cfm_ccm_interval interval)
+{
+	switch (interval) {
+	case BR_CFM_CCM_INTERVAL_NONE:
+		return 0;
+	case BR_CFM_CCM_INTERVAL_3_3_MS:
+		return 1;
+	case BR_CFM_CCM_INTERVAL_10_MS:
+		return 2;
+	case BR_CFM_CCM_INTERVAL_100_MS:
+		return 3;
+	case BR_CFM_CCM_INTERVAL_1_SEC:
+		return 4;
+	case BR_CFM_CCM_INTERVAL_10_SEC:
+		return 5;
+	case BR_CFM_CCM_INTERVAL_1_MIN:
+		return 6;
+	case BR_CFM_CCM_INTERVAL_10_MIN:
+		return 7;
+	}
+	return 0;
+}
+
+static struct sk_buff *ccm_frame_build(struct br_cfm_mep *mep,
+				       const struct br_cfm_cc_ccm_tx_info *const tx_info)
+
+{
+	struct br_cfm_common_hdr *common_hdr;
+	struct net_bridge_port *b_port;
+	struct br_cfm_maid *maid;
+	u8 *itu_reserved, *e_tlv;
+	struct ethhdr *eth_hdr;
+	struct sk_buff *skb;
+	__be32 *status_tlv;
+	__be32 *snumber;
+	__be16 *mepid;
+
+	skb = dev_alloc_skb(CFM_CCM_MAX_FRAME_LENGTH);
+	if (!skb)
+		return NULL;
+
+	rcu_read_lock();
+	b_port = rcu_dereference(mep->b_port);
+	if (!b_port) {
+		rcu_read_unlock();
+		return NULL;
+	}
+	skb->dev = b_port->dev;
+	rcu_read_unlock();
+	/* The device cannot be deleted until the work_queue functions has
+	 * completed. This function is called from ccm_tx_work_expired()
+	 * that is a work_queue functions.
+	 */
+
+	skb->protocol = htons(ETH_P_CFM);
+	skb->priority = CFM_FRAME_PRIO;
+
+	/* Ethernet header */
+	eth_hdr = skb_put(skb, sizeof(*eth_hdr));
+	ether_addr_copy(eth_hdr->h_dest, tx_info->dmac.addr);
+	ether_addr_copy(eth_hdr->h_source, mep->config.unicast_mac.addr);
+	eth_hdr->h_proto = htons(ETH_P_CFM);
+
+	/* Common CFM Header */
+	common_hdr = skb_put(skb, sizeof(*common_hdr));
+	common_hdr->mdlevel_version = mep->config.mdlevel << 5;
+	common_hdr->opcode = BR_CFM_OPCODE_CCM;
+	common_hdr->flags = (mep->rdi << 7) |
+			    interval_to_pdu(mep->cc_config.exp_interval);
+	common_hdr->tlv_offset = CFM_CCM_TLV_OFFSET;
+
+	/* Sequence number */
+	snumber = skb_put(skb, sizeof(*snumber));
+	if (tx_info->seq_no_update) {
+		*snumber = cpu_to_be32(mep->ccm_tx_snumber);
+		mep->ccm_tx_snumber += 1;
+	} else {
+		*snumber = 0;
+	}
+
+	mepid = skb_put(skb, sizeof(*mepid));
+	*mepid = cpu_to_be16((u16)mep->config.mepid);
+
+	maid = skb_put(skb, sizeof(*maid));
+	memcpy(maid->data, mep->cc_config.exp_maid.data, sizeof(maid->data));
+
+	/* ITU reserved (CFM_CCM_ITU_RESERVED_SIZE octets) */
+	itu_reserved = skb_put(skb, CFM_CCM_ITU_RESERVED_SIZE);
+	memset(itu_reserved, 0, CFM_CCM_ITU_RESERVED_SIZE);
+
+	/* Generel CFM TLV format:
+	 * TLV type:		one byte
+	 * TLV value length:	two bytes
+	 * TLV value:		'TLV value length' bytes
+	 */
+
+	/* Port status TLV. The value length is 1. Total of 4 bytes. */
+	if (tx_info->port_tlv) {
+		status_tlv = skb_put(skb, sizeof(*status_tlv));
+		*status_tlv = cpu_to_be32((CFM_PORT_STATUS_TLV_TYPE << 24) |
+					  (1 << 8) |	/* Value length */
+					  (tx_info->port_tlv_value & 0xFF));
+	}
+
+	/* Interface status TLV. The value length is 1. Total of 4 bytes. */
+	if (tx_info->if_tlv) {
+		status_tlv = skb_put(skb, sizeof(*status_tlv));
+		*status_tlv = cpu_to_be32((CFM_IF_STATUS_TLV_TYPE << 24) |
+					  (1 << 8) |	/* Value length */
+					  (tx_info->if_tlv_value & 0xFF));
+	}
+
+	/* End TLV */
+	e_tlv = skb_put(skb, sizeof(*e_tlv));
+	*e_tlv = CFM_ENDE_TLV_TYPE;
+
+	return skb;
+}
+
+static void ccm_frame_tx(struct sk_buff *skb)
+{
+	skb_reset_network_header(skb);
+	dev_queue_xmit(skb);
+}
+
+/* This function is called with the configured CC 'expected_interval'
+ * in order to drive CCM transmission when enabled.
+ */
+static void ccm_tx_work_expired(struct work_struct *work)
+{
+	struct delayed_work *del_work;
+	struct br_cfm_mep *mep;
+	struct sk_buff *skb;
+	u32 interval_us;
+
+	del_work = to_delayed_work(work);
+	mep = container_of(del_work, struct br_cfm_mep, ccm_tx_dwork);
+
+	if (time_before_eq(mep->ccm_tx_end, jiffies)) {
+		/* Transmission period has ended */
+		mep->cc_ccm_tx_info.period = 0;
+		return;
+	}
+
+	skb = ccm_frame_build(mep, &mep->cc_ccm_tx_info);
+	if (skb)
+		ccm_frame_tx(skb);
+
+	interval_us = interval_to_us(mep->cc_config.exp_interval);
+	queue_delayed_work(system_wq, &mep->ccm_tx_dwork,
+			   usecs_to_jiffies(interval_us));
+}
+
 int br_cfm_mep_create(struct net_bridge *br,
 		      const u32 instance,
 		      struct br_cfm_mep_create *const create,
@@ -115,6 +293,7 @@ int br_cfm_mep_create(struct net_bridge *br,
 	rcu_assign_pointer(mep->b_port, p);
 
 	INIT_HLIST_HEAD(&mep->peer_mep_list);
+	INIT_DELAYED_WORK(&mep->ccm_tx_dwork, ccm_tx_work_expired);
 
 	hlist_add_tail_rcu(&mep->head, &br->mep_list);
 
@@ -135,6 +314,8 @@ static void mep_delete_implementation(struct net_bridge *br,
 		kfree_rcu(peer_mep, rcu);
 	}
 
+	cancel_delayed_work_sync(&mep->ccm_tx_dwork);
+
 	RCU_INIT_POINTER(mep->b_port, NULL);
 	hlist_del_rcu(&mep->head);
 	kfree_rcu(mep, rcu);
@@ -193,6 +374,32 @@ int br_cfm_mep_config_set(struct net_bridge *br,
 	return 0;
 }
 
+int br_cfm_cc_config_set(struct net_bridge *br,
+			 const u32 instance,
+			 const struct br_cfm_cc_config *const config,
+			 struct netlink_ext_ack *extack)
+{
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	mep = br_mep_find(br, instance);
+	if (!mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP instance does not exists");
+		return -ENOENT;
+	}
+
+	/* Check for no change in configuration */
+	if (memcmp(config, &mep->cc_config, sizeof(*config)) == 0)
+		return 0;
+
+	mep->cc_config = *config;
+	mep->ccm_tx_snumber = 1;
+
+	return 0;
+}
+
 int br_cfm_cc_peer_mep_add(struct net_bridge *br, const u32 instance,
 			   u32 mepid,
 			   struct netlink_ext_ack *extack)
@@ -263,6 +470,83 @@ int br_cfm_cc_peer_mep_remove(struct net_bridge *br, const
u32 instance,
 	return 0;
 }
 
+int br_cfm_cc_rdi_set(struct net_bridge *br, const u32 instance,
+		      const bool rdi, struct netlink_ext_ack *extack)
+{
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	mep = br_mep_find(br, instance);
+	if (!mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP instance does not exists");
+		return -ENOENT;
+	}
+
+	mep->rdi = rdi;
+
+	return 0;
+}
+
+int br_cfm_cc_ccm_tx(struct net_bridge *br, const u32 instance,
+		     const struct br_cfm_cc_ccm_tx_info *const tx_info,
+		     struct netlink_ext_ack *extack)
+{
+	struct br_cfm_mep *mep;
+
+	ASSERT_RTNL();
+
+	mep = br_mep_find(br, instance);
+	if (!mep) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "MEP instance does not exists");
+		return -ENOENT;
+	}
+
+	if (memcmp(tx_info, &mep->cc_ccm_tx_info, sizeof(*tx_info)) == 0) {
+		/* No change in tx_info. */
+		if (mep->cc_ccm_tx_info.period == 0)
+			/* Transmission is not enabled - just return */
+			return 0;
+
+		/* Transmission is ongoing, the end time is recalculated */
+		mep->ccm_tx_end = jiffies +
+				  usecs_to_jiffies(tx_info->period * 1000000);
+		return 0;
+	}
+
+	if (tx_info->period == 0 && mep->cc_ccm_tx_info.period == 0)
+		/* Some change in info and transmission is not ongoing */
+		goto save;
+
+	if (tx_info->period != 0 && mep->cc_ccm_tx_info.period != 0) {
+		/* Some change in info and transmission is ongoing
+		 * The end time is recalculated
+		 */
+		mep->ccm_tx_end = jiffies +
+				  usecs_to_jiffies(tx_info->period * 1000000);
+
+		goto save;
+	}
+
+	if (tx_info->period == 0 && mep->cc_ccm_tx_info.period != 0) {
+		cancel_delayed_work_sync(&mep->ccm_tx_dwork);
+		goto save;
+	}
+
+	/* Start delayed work to transmit CCM frames. It is done with zero delay
+	 * to send first frame immediately
+	 */
+	mep->ccm_tx_end = jiffies + usecs_to_jiffies(tx_info->period * 1000000);
+	queue_delayed_work(system_wq, &mep->ccm_tx_dwork, 0);
+
+save:
+	mep->cc_ccm_tx_info = *tx_info;
+
+	return 0;
+}
+
 /* Deletes the CFM instances on a specific bridge port
  */
 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *port)
diff --git a/net/bridge/br_private_cfm.h b/net/bridge/br_private_cfm.h
index 40fe982added..8d1b449acfbf 100644
--- a/net/bridge/br_private_cfm.h
+++ b/net/bridge/br_private_cfm.h
@@ -32,6 +32,24 @@ int br_cfm_mep_config_set(struct net_bridge *br,
 			  const struct br_cfm_mep_config *const config,
 			  struct netlink_ext_ack *extack);
 
+struct br_cfm_maid {
+	u8 data[CFM_MAID_LENGTH];
+};
+
+struct br_cfm_cc_config {
+	/* Expected received CCM PDU MAID. */
+	struct br_cfm_maid exp_maid;
+
+	/* Expected received CCM PDU interval. */
+	/* Transmitting CCM PDU interval when CCM tx is enabled. */
+	enum br_cfm_ccm_interval exp_interval;
+};
+
+int br_cfm_cc_config_set(struct net_bridge *br,
+			 const u32 instance,
+			 const struct br_cfm_cc_config *const config,
+			 struct netlink_ext_ack *extack);
+
 int br_cfm_cc_peer_mep_add(struct net_bridge *br, const u32 instance,
 			   u32 peer_mep_id,
 			   struct netlink_ext_ack *extack);
@@ -39,15 +57,51 @@ int br_cfm_cc_peer_mep_remove(struct net_bridge *br, const
u32 instance,
 			      u32 peer_mep_id,
 			      struct netlink_ext_ack *extack);
 
+/* Transmitted CCM Remote Defect Indication status set.
+ * This RDI is inserted in transmitted CCM PDUs if CCM transmission is enabled.
+ * See br_cfm_cc_ccm_tx() with interval != BR_CFM_CCM_INTERVAL_NONE
+ */
+int br_cfm_cc_rdi_set(struct net_bridge *br, const u32 instance,
+		      const bool rdi, struct netlink_ext_ack *extack);
+
+/* OAM PDU Tx information */
+struct br_cfm_cc_ccm_tx_info {
+	struct mac_addr dmac;
+	/* The CCM will be transmitted for this period in seconds.
+	 * Call br_cfm_cc_ccm_tx before timeout to keep transmission alive.
+	 * When period is zero any ongoing transmission will be stopped.
+	 */
+	u32 period;
+
+	bool seq_no_update; /* Update Tx CCM sequence number */
+	bool if_tlv; /* Insert Interface Status TLV */
+	u8 if_tlv_value; /* Interface Status TLV value */
+	bool port_tlv; /* Insert Port Status TLV */
+	u8 port_tlv_value; /* Port Status TLV value */
+	/* Sender ID TLV ??
+	 * Organization-Specific TLV ??
+	 */
+};
+
+int br_cfm_cc_ccm_tx(struct net_bridge *br, const u32 instance,
+		     const struct br_cfm_cc_ccm_tx_info *const tx_info,
+		     struct netlink_ext_ack *extack);
+
 struct br_cfm_mep {
 	/* list header of MEP instances */
 	struct hlist_node		head;
 	u32				instance;
 	struct br_cfm_mep_create	create;
 	struct br_cfm_mep_config	config;
+	struct br_cfm_cc_config		cc_config;
+	struct br_cfm_cc_ccm_tx_info	cc_ccm_tx_info;
 	/* List of multiple peer MEPs */
 	struct hlist_head		peer_mep_list;
 	struct net_bridge_port __rcu	*b_port;
+	unsigned long			ccm_tx_end;
+	struct delayed_work		ccm_tx_dwork;
+	u32				ccm_tx_snumber;
+	bool				rdi;
 	struct rcu_head			rcu;
 };
 
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 06/10] bridge: cfm: Kernel space implementation of CFM. CCM frame RX added.

This is the third commit of the implementation of the CFM protocol
according to 802.1Q section 12.14.

Functionality is extended with CCM frame reception.
The MEP instance now contains CCM based status information.
Most important is the CCM defect status indicating if correct
CCM frames are received with the expected interval.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay at nvidia.com>
---
 include/uapi/linux/cfm_bridge.h |  10 ++
 net/bridge/br_cfm.c             | 269 ++++++++++++++++++++++++++++++++
 net/bridge/br_private_cfm.h     |  32 ++++
 3 files changed, 311 insertions(+)

diff --git a/include/uapi/linux/cfm_bridge.h b/include/uapi/linux/cfm_bridge.h
index 84a3817da90b..4be195cc6b70 100644
--- a/include/uapi/linux/cfm_bridge.h
+++ b/include/uapi/linux/cfm_bridge.h
@@ -20,6 +20,10 @@
 					 CFM_IF_STATUS_TLV_LENGTH)
 #define CFM_FRAME_PRIO			7
 #define CFM_CCM_TLV_OFFSET		70
+#define CFM_CCM_PDU_MAID_OFFSET		10
+#define CFM_CCM_PDU_MEPID_OFFSET	8
+#define CFM_CCM_PDU_SEQNR_OFFSET	4
+#define CFM_CCM_PDU_TLV_OFFSET		74
 #define CFM_CCM_ITU_RESERVED_SIZE	16
 
 struct br_cfm_common_hdr {
@@ -29,6 +33,12 @@ struct br_cfm_common_hdr {
 	__u8 tlv_offset;
 };
 
+struct br_cfm_status_tlv {
+	__u8 type;
+	__be16 length;
+	__u8 value;
+};
+
 enum br_cfm_opcodes {
 	BR_CFM_OPCODE_CCM = 0x1,
 };
diff --git a/net/bridge/br_cfm.c b/net/bridge/br_cfm.c
index 4b7af1adcd6a..d928de5de155 100644
--- a/net/bridge/br_cfm.c
+++ b/net/bridge/br_cfm.c
@@ -101,6 +101,56 @@ static u32 interval_to_pdu(enum br_cfm_ccm_interval
interval)
 	return 0;
 }
 
+/* Convert the CCM PDU value to interval on interface. */
+static u32 pdu_to_interval(u32 value)
+{
+	switch (value) {
+	case 0:
+		return BR_CFM_CCM_INTERVAL_NONE;
+	case 1:
+		return BR_CFM_CCM_INTERVAL_3_3_MS;
+	case 2:
+		return BR_CFM_CCM_INTERVAL_10_MS;
+	case 3:
+		return BR_CFM_CCM_INTERVAL_100_MS;
+	case 4:
+		return BR_CFM_CCM_INTERVAL_1_SEC;
+	case 5:
+		return BR_CFM_CCM_INTERVAL_10_SEC;
+	case 6:
+		return BR_CFM_CCM_INTERVAL_1_MIN;
+	case 7:
+		return BR_CFM_CCM_INTERVAL_10_MIN;
+	}
+	return BR_CFM_CCM_INTERVAL_NONE;
+}
+
+static void ccm_rx_timer_start(struct br_cfm_peer_mep *peer_mep)
+{
+	u32 interval_us;
+
+	interval_us = interval_to_us(peer_mep->mep->cc_config.exp_interval);
+	/* Function ccm_rx_dwork must be called with 1/4
+	 * of the configured CC 'expected_interval'
+	 * in order to detect CCM defect after 3.25 interval.
+	 */
+	queue_delayed_work(system_wq, &peer_mep->ccm_rx_dwork,
+			   usecs_to_jiffies(interval_us / 4));
+}
+
+static void cc_peer_enable(struct br_cfm_peer_mep *peer_mep)
+{
+	memset(&peer_mep->cc_status, 0, sizeof(peer_mep->cc_status));
+	peer_mep->ccm_rx_count_miss = 0;
+
+	ccm_rx_timer_start(peer_mep);
+}
+
+static void cc_peer_disable(struct br_cfm_peer_mep *peer_mep)
+{
+	cancel_delayed_work_sync(&peer_mep->ccm_rx_dwork);
+}
+
 static struct sk_buff *ccm_frame_build(struct br_cfm_mep *mep,
 				       const struct br_cfm_cc_ccm_tx_info *const tx_info)
 
@@ -231,6 +281,200 @@ static void ccm_tx_work_expired(struct work_struct *work)
 			   usecs_to_jiffies(interval_us));
 }
 
+/* This function is called with 1/4 of the configured CC
'expected_interval'
+ * in order to detect CCM defect after 3.25 interval.
+ */
+static void ccm_rx_work_expired(struct work_struct *work)
+{
+	struct br_cfm_peer_mep *peer_mep;
+	struct delayed_work *del_work;
+
+	del_work = to_delayed_work(work);
+	peer_mep = container_of(del_work, struct br_cfm_peer_mep, ccm_rx_dwork);
+
+	/* After 13 counts (4 * 3,25) then 3.25 intervals are expired */
+	if (peer_mep->ccm_rx_count_miss < 13) {
+		/* 3.25 intervals are NOT expired without CCM reception */
+		peer_mep->ccm_rx_count_miss++;
+
+		/* Start timer again */
+		ccm_rx_timer_start(peer_mep);
+	} else {
+		/* 3.25 intervals are expired without CCM reception.
+		 * CCM defect detected
+		 */
+		peer_mep->cc_status.ccm_defect = true;
+	}
+}
+
+static u32 ccm_tlv_extract(struct sk_buff *skb, u32 index,
+			   struct br_cfm_peer_mep *peer_mep)
+{
+	__be32 *s_tlv;
+	__be32 _s_tlv;
+	u32 h_s_tlv;
+	u8 *e_tlv;
+	u8 _e_tlv;
+
+	e_tlv = skb_header_pointer(skb, index, sizeof(_e_tlv), &_e_tlv);
+	if (!e_tlv)
+		return 0;
+
+	/* TLV is present - get the status TLV */
+	s_tlv = skb_header_pointer(skb,
+				   index,
+				   sizeof(_s_tlv), &_s_tlv);
+	if (!s_tlv)
+		return 0;
+
+	h_s_tlv = ntohl(*s_tlv);
+	if ((h_s_tlv >> 24) == CFM_IF_STATUS_TLV_TYPE) {
+		/* Interface status TLV */
+		peer_mep->cc_status.tlv_seen = true;
+		peer_mep->cc_status.if_tlv_value = (h_s_tlv & 0xFF);
+	}
+
+	if ((h_s_tlv >> 24) == CFM_PORT_STATUS_TLV_TYPE) {
+		/* Port status TLV */
+		peer_mep->cc_status.tlv_seen = true;
+		peer_mep->cc_status.port_tlv_value = (h_s_tlv & 0xFF);
+	}
+
+	/* The Sender ID TLV is not handled */
+	/* The Organization-Specific TLV is not handled */
+
+	/* Return the length of this tlv.
+	 * This is the length of the value field plus 3 bytes for size of type
+	 * field and length field
+	 */
+	return ((h_s_tlv >> 8) & 0xFFFF) + 3;
+}
+
+/* note: already called with rcu_read_lock */
+static int br_cfm_frame_rx(struct net_bridge_port *port, struct sk_buff *skb)
+{
+	u32 mdlevel, interval, size, index, max;
+	const struct br_cfm_common_hdr *hdr;
+	struct br_cfm_peer_mep *peer_mep;
+	const struct br_cfm_maid *maid;
+	struct br_cfm_common_hdr _hdr;
+	struct br_cfm_maid _maid;
+	struct br_cfm_mep *mep;
+	struct net_bridge *br;
+	__be32 *snumber;
+	__be32 _snumber;
+	__be16 *mepid;
+	__be16 _mepid;
+
+	if (port->state == BR_STATE_DISABLED)
+		return 0;
+
+	hdr = skb_header_pointer(skb, 0, sizeof(_hdr), &_hdr);
+	if (!hdr)
+		return 1;
+
+	br = port->br;
+	mep = br_mep_find_ifindex(br, port->dev->ifindex);
+	if (unlikely(!mep))
+		/* No MEP on this port - must be forwarded */
+		return 0;
+
+	mdlevel = hdr->mdlevel_version >> 5;
+	if (mdlevel > mep->config.mdlevel)
+		/* The level is above this MEP level - must be forwarded */
+		return 0;
+
+	if ((hdr->mdlevel_version & 0x1F) != 0) {
+		/* Invalid version */
+		mep->status.version_unexp_seen = true;
+		return 1;
+	}
+
+	if (mdlevel < mep->config.mdlevel) {
+		/* The level is below this MEP level */
+		mep->status.rx_level_low_seen = true;
+		return 1;
+	}
+
+	if (hdr->opcode == BR_CFM_OPCODE_CCM) {
+		/* CCM PDU received. */
+		/* MA ID is after common header + sequence number + MEP ID */
+		maid = skb_header_pointer(skb,
+					  CFM_CCM_PDU_MAID_OFFSET,
+					  sizeof(_maid), &_maid);
+		if (!maid)
+			return 1;
+		if (memcmp(maid->data, mep->cc_config.exp_maid.data,
+			   sizeof(maid->data)))
+			/* MA ID not as expected */
+			return 1;
+
+		/* MEP ID is after common header + sequence number */
+		mepid = skb_header_pointer(skb,
+					   CFM_CCM_PDU_MEPID_OFFSET,
+					   sizeof(_mepid), &_mepid);
+		if (!mepid)
+			return 1;
+		peer_mep = br_peer_mep_find(mep, (u32)ntohs(*mepid));
+		if (!peer_mep)
+			return 1;
+
+		/* Interval is in common header flags */
+		interval = hdr->flags & 0x07;
+		if (mep->cc_config.exp_interval != pdu_to_interval(interval))
+			/* Interval not as expected */
+			return 1;
+
+		/* A valid CCM frame is received */
+		if (peer_mep->cc_status.ccm_defect) {
+			peer_mep->cc_status.ccm_defect = false;
+
+			/* Start CCM RX timer */
+			ccm_rx_timer_start(peer_mep);
+		}
+
+		peer_mep->cc_status.seen = true;
+		peer_mep->ccm_rx_count_miss = 0;
+
+		/* RDI is in common header flags */
+		peer_mep->cc_status.rdi = (hdr->flags & 0x80) ? true : false;
+
+		/* Sequence number is after common header */
+		snumber = skb_header_pointer(skb,
+					     CFM_CCM_PDU_SEQNR_OFFSET,
+					     sizeof(_snumber), &_snumber);
+		if (!snumber)
+			return 1;
+		if (ntohl(*snumber) != (mep->ccm_rx_snumber + 1))
+			/* Unexpected sequence number */
+			peer_mep->cc_status.seq_unexp_seen = true;
+
+		mep->ccm_rx_snumber = ntohl(*snumber);
+
+		/* TLV end is after common header + sequence number + MEP ID +
+		 * MA ID + ITU reserved
+		 */
+		index = CFM_CCM_PDU_TLV_OFFSET;
+		max = 0;
+		do { /* Handle all TLVs */
+			size = ccm_tlv_extract(skb, index, peer_mep);
+			index += size;
+			max += 1;
+		} while (size != 0 && max < 4); /* Max four TLVs possible */
+
+		return 1;
+	}
+
+	mep->status.opcode_unexp_seen = true;
+
+	return 1;
+}
+
+static struct br_frame_type cfm_frame_type __read_mostly = {
+	.type = cpu_to_be16(ETH_P_CFM),
+	.frame_handler = br_cfm_frame_rx,
+};
+
 int br_cfm_mep_create(struct net_bridge *br,
 		      const u32 instance,
 		      struct br_cfm_mep_create *const create,
@@ -295,6 +539,9 @@ int br_cfm_mep_create(struct net_bridge *br,
 	INIT_HLIST_HEAD(&mep->peer_mep_list);
 	INIT_DELAYED_WORK(&mep->ccm_tx_dwork, ccm_tx_work_expired);
 
+	if (hlist_empty(&br->mep_list))
+		br_add_frame(br, &cfm_frame_type);
+
 	hlist_add_tail_rcu(&mep->head, &br->mep_list);
 
 	return 0;
@@ -310,6 +557,7 @@ static void mep_delete_implementation(struct net_bridge *br,
 
 	/* Empty and free peer MEP list */
 	hlist_for_each_entry_safe(peer_mep, n_store, &mep->peer_mep_list, head)
{
+		cancel_delayed_work_sync(&peer_mep->ccm_rx_dwork);
 		hlist_del_rcu(&peer_mep->head);
 		kfree_rcu(peer_mep, rcu);
 	}
@@ -319,6 +567,9 @@ static void mep_delete_implementation(struct net_bridge *br,
 	RCU_INIT_POINTER(mep->b_port, NULL);
 	hlist_del_rcu(&mep->head);
 	kfree_rcu(mep, rcu);
+
+	if (hlist_empty(&br->mep_list))
+		br_del_frame(br, &cfm_frame_type);
 }
 
 int br_cfm_mep_delete(struct net_bridge *br,
@@ -379,6 +630,7 @@ int br_cfm_cc_config_set(struct net_bridge *br,
 			 const struct br_cfm_cc_config *const config,
 			 struct netlink_ext_ack *extack)
 {
+	struct br_cfm_peer_mep *peer_mep;
 	struct br_cfm_mep *mep;
 
 	ASSERT_RTNL();
@@ -394,7 +646,18 @@ int br_cfm_cc_config_set(struct net_bridge *br,
 	if (memcmp(config, &mep->cc_config, sizeof(*config)) == 0)
 		return 0;
 
+	if (config->enable && !mep->cc_config.enable)
+		/* CC is enabled */
+		hlist_for_each_entry(peer_mep, &mep->peer_mep_list, head)
+			cc_peer_enable(peer_mep);
+
+	if (!config->enable && mep->cc_config.enable)
+		/* CC is disabled */
+		hlist_for_each_entry(peer_mep, &mep->peer_mep_list, head)
+			cc_peer_disable(peer_mep);
+
 	mep->cc_config = *config;
+	mep->ccm_rx_snumber = 0;
 	mep->ccm_tx_snumber = 1;
 
 	return 0;
@@ -435,6 +698,10 @@ int br_cfm_cc_peer_mep_add(struct net_bridge *br, const u32
instance,
 
 	peer_mep->mepid = mepid;
 	peer_mep->mep = mep;
+	INIT_DELAYED_WORK(&peer_mep->ccm_rx_dwork, ccm_rx_work_expired);
+
+	if (mep->cc_config.enable)
+		cc_peer_enable(peer_mep);
 
 	hlist_add_tail_rcu(&peer_mep->head, &mep->peer_mep_list);
 
@@ -464,6 +731,8 @@ int br_cfm_cc_peer_mep_remove(struct net_bridge *br, const
u32 instance,
 		return -ENOENT;
 	}
 
+	cc_peer_disable(peer_mep);
+
 	hlist_del_rcu(&peer_mep->head);
 	kfree_rcu(peer_mep, rcu);
 
diff --git a/net/bridge/br_private_cfm.h b/net/bridge/br_private_cfm.h
index 8d1b449acfbf..6a2294c0ea79 100644
--- a/net/bridge/br_private_cfm.h
+++ b/net/bridge/br_private_cfm.h
@@ -43,6 +43,8 @@ struct br_cfm_cc_config {
 	/* Expected received CCM PDU interval. */
 	/* Transmitting CCM PDU interval when CCM tx is enabled. */
 	enum br_cfm_ccm_interval exp_interval;
+
+	bool enable; /* Enable/disable CCM PDU handling */
 };
 
 int br_cfm_cc_config_set(struct net_bridge *br,
@@ -87,6 +89,31 @@ int br_cfm_cc_ccm_tx(struct net_bridge *br, const u32
instance,
 		     const struct br_cfm_cc_ccm_tx_info *const tx_info,
 		     struct netlink_ext_ack *extack);
 
+struct br_cfm_mep_status {
+	/* Indications that an OAM PDU has been seen. */
+	bool opcode_unexp_seen; /* RX of OAM PDU with unexpected opcode */
+	bool version_unexp_seen; /* RX of OAM PDU with unexpected version */
+	bool rx_level_low_seen; /* Rx of OAM PDU with level low */
+};
+
+struct br_cfm_cc_peer_status {
+	/* This CCM related status is based on the latest received CCM PDU. */
+	u8 port_tlv_value; /* Port Status TLV value */
+	u8 if_tlv_value; /* Interface Status TLV value */
+
+	/* CCM has not been received for 3.25 intervals */
+	bool ccm_defect;
+
+	/* (RDI == 1) for last received CCM PDU */
+	bool rdi;
+
+	/* Indications that a CCM PDU has been seen. */
+	bool seen; /* CCM PDU received */
+	bool tlv_seen; /* CCM PDU with TLV received */
+	/* CCM PDU with unexpected sequence number received */
+	bool seq_unexp_seen;
+};
+
 struct br_cfm_mep {
 	/* list header of MEP instances */
 	struct hlist_node		head;
@@ -101,6 +128,8 @@ struct br_cfm_mep {
 	unsigned long			ccm_tx_end;
 	struct delayed_work		ccm_tx_dwork;
 	u32				ccm_tx_snumber;
+	u32				ccm_rx_snumber;
+	struct br_cfm_mep_status	status;
 	bool				rdi;
 	struct rcu_head			rcu;
 };
@@ -108,7 +137,10 @@ struct br_cfm_mep {
 struct br_cfm_peer_mep {
 	struct hlist_node		head;
 	struct br_cfm_mep		*mep;
+	struct delayed_work		ccm_rx_dwork;
 	u32				mepid;
+	struct br_cfm_cc_peer_status	cc_status;
+	u32				ccm_rx_count_miss;
 	struct rcu_head			rcu;
 };
 
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 07/10] bridge: cfm: Netlink SET configuration Interface.

This is the implementation of CFM netlink configuration
set information interface.

Add new nested netlink attributes. These attributes are used by the
user space to create/delete/configure CFM instances.

SETLINK:
    IFLA_BRIDGE_CFM:
        Indicate that the following attributes are CFM.

    IFLA_BRIDGE_CFM_MEP_CREATE:
        This indicate that a MEP instance must be created.
    IFLA_BRIDGE_CFM_MEP_DELETE:
        This indicate that a MEP instance must be deleted.
    IFLA_BRIDGE_CFM_MEP_CONFIG:
        This indicate that a MEP instance must be configured.
    IFLA_BRIDGE_CFM_CC_CONFIG:
        This indicate that a MEP instance Continuity Check (CC)
        functionality must be configured.
    IFLA_BRIDGE_CFM_CC_PEER_MEP_ADD:
        This indicate that a CC Peer MEP must be added.
    IFLA_BRIDGE_CFM_CC_PEER_MEP_REMOVE:
        This indicate that a CC Peer MEP must be removed.
    IFLA_BRIDGE_CFM_CC_CCM_TX:
        This indicate that the CC transmitted CCM PDU must be configured.
    IFLA_BRIDGE_CFM_CC_RDI:
        This indicate that the CC transmitted CCM PDU RDI must be
        configured.

CFM nested attribute has the following attributes in next level.

SETLINK RTEXT_FILTER_CFM_CONFIG:
    IFLA_BRIDGE_CFM_MEP_CREATE_INSTANCE:
        The created MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_MEP_CREATE_DOMAIN:
        The created MEP domain.
        The type is u32 (br_cfm_domain).
        It must be BR_CFM_PORT.
        This means that CFM frames are transmitted and received
        directly on the port - untagged. Not in a VLAN.
    IFLA_BRIDGE_CFM_MEP_CREATE_DIRECTION:
        The created MEP direction.
        The type is u32 (br_cfm_mep_direction).
        It must be BR_CFM_MEP_DIRECTION_DOWN.
        This means that CFM frames are transmitted and received on
        the port. Not in the bridge.
    IFLA_BRIDGE_CFM_MEP_CREATE_IFINDEX:
        The created MEP residence port ifindex.
        The type is u32 (ifindex).

    IFLA_BRIDGE_CFM_MEP_DELETE_INSTANCE:
        The deleted MEP instance number.
        The type is u32.

    IFLA_BRIDGE_CFM_MEP_CONFIG_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_MEP_CONFIG_UNICAST_MAC:
        The configured MEP unicast MAC address.
        The type is 6*u8 (array).
        This is used as SMAC in all transmitted CFM frames.
    IFLA_BRIDGE_CFM_MEP_CONFIG_MDLEVEL:
        The configured MEP unicast MD level.
        The type is u32.
        It must be in the range 1-7.
        No CFM frames are passing through this MEP on lower levels.
    IFLA_BRIDGE_CFM_MEP_CONFIG_MEPID:
        The configured MEP ID.
        The type is u32.
        It must be in the range 0-0x1FFF.
        This MEP ID is inserted in any transmitted CCM frame.

    IFLA_BRIDGE_CFM_CC_CONFIG_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_CONFIG_ENABLE:
        The Continuity Check (CC) functionality is enabled or disabled.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL:
        The CC expected receive interval of CCM frames.
        The type is u32 (br_cfm_ccm_interval).
        This is also the transmission interval of CCM frames when enabled.
    IFLA_BRIDGE_CFM_CC_CONFIG_EXP_MAID:
        The CC expected receive MAID in CCM frames.
        The type is CFM_MAID_LENGTH*u8.
        This is MAID is also inserted in transmitted CCM frames.

    IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_PEER_MEPID:
        The CC Peer MEP ID added.
        The type is u32.
        When a Peer MEP ID is added and CC is enabled it is expected to
        receive CCM frames from that Peer MEP.

    IFLA_BRIDGE_CFM_CC_RDI_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_RDI_RDI:
        The RDI that is inserted in transmitted CCM PDU.
        The type is u32 (bool).

    IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC:
        The transmitted CCM frame destination MAC address.
        The type is 6*u8 (array).
        This is used as DMAC in all transmitted CFM frames.
    IFLA_BRIDGE_CFM_CC_CCM_TX_SEQ_NO_UPDATE:
        The transmitted CCM frame update (increment) of sequence
        number is enabled or disabled.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_CCM_TX_PERIOD:
        The period of time where CCM frame are transmitted.
        The type is u32.
        The time is given in seconds. SETLINK IFLA_BRIDGE_CFM_CC_CCM_TX
        must be done before timeout to keep transmission alive.
        When period is zero any ongoing CCM frame transmission
        will be stopped.
    IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV:
        The transmitted CCM frame update with Interface Status TLV
        is enabled or disabled.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV_VALUE:
        The transmitted Interface Status TLV value field.
        The type is u8.
    IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV:
        The transmitted CCM frame update with Port Status TLV is enabled
        or disabled.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV_VALUE:
        The transmitted Port Status TLV value field.
        The type is u8.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay at nvidia.com>
---
 include/uapi/linux/if_bridge.h |  90 +++++++
 include/uapi/linux/rtnetlink.h |   1 +
 net/bridge/Makefile            |   2 +-
 net/bridge/br_cfm.c            |   5 +
 net/bridge/br_cfm_netlink.c    | 453 +++++++++++++++++++++++++++++++++
 net/bridge/br_netlink.c        |   5 +
 net/bridge/br_private.h        |  17 +-
 7 files changed, 571 insertions(+), 2 deletions(-)
 create mode 100644 net/bridge/br_cfm_netlink.c

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 4c687686aa8f..94cc9444d749 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -121,6 +121,7 @@ enum {
 	IFLA_BRIDGE_VLAN_INFO,
 	IFLA_BRIDGE_VLAN_TUNNEL_INFO,
 	IFLA_BRIDGE_MRP,
+	IFLA_BRIDGE_CFM,
 	__IFLA_BRIDGE_MAX,
 };
 #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
@@ -328,6 +329,95 @@ struct br_mrp_start_in_test {
 	__u16 in_id;
 };
 
+enum {
+	IFLA_BRIDGE_CFM_UNSPEC,
+	IFLA_BRIDGE_CFM_MEP_CREATE,
+	IFLA_BRIDGE_CFM_MEP_DELETE,
+	IFLA_BRIDGE_CFM_MEP_CONFIG,
+	IFLA_BRIDGE_CFM_CC_CONFIG,
+	IFLA_BRIDGE_CFM_CC_PEER_MEP_ADD,
+	IFLA_BRIDGE_CFM_CC_PEER_MEP_REMOVE,
+	IFLA_BRIDGE_CFM_CC_RDI,
+	IFLA_BRIDGE_CFM_CC_CCM_TX,
+	__IFLA_BRIDGE_CFM_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_MAX (__IFLA_BRIDGE_CFM_MAX - 1)
+
+enum {
+	IFLA_BRIDGE_CFM_MEP_CREATE_UNSPEC,
+	IFLA_BRIDGE_CFM_MEP_CREATE_INSTANCE,
+	IFLA_BRIDGE_CFM_MEP_CREATE_DOMAIN,
+	IFLA_BRIDGE_CFM_MEP_CREATE_DIRECTION,
+	IFLA_BRIDGE_CFM_MEP_CREATE_IFINDEX,
+	__IFLA_BRIDGE_CFM_MEP_CREATE_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_MEP_CREATE_MAX (__IFLA_BRIDGE_CFM_MEP_CREATE_MAX - 1)
+
+enum {
+	IFLA_BRIDGE_CFM_MEP_DELETE_UNSPEC,
+	IFLA_BRIDGE_CFM_MEP_DELETE_INSTANCE,
+	__IFLA_BRIDGE_CFM_MEP_DELETE_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_MEP_DELETE_MAX (__IFLA_BRIDGE_CFM_MEP_DELETE_MAX - 1)
+
+enum {
+	IFLA_BRIDGE_CFM_MEP_CONFIG_UNSPEC,
+	IFLA_BRIDGE_CFM_MEP_CONFIG_INSTANCE,
+	IFLA_BRIDGE_CFM_MEP_CONFIG_UNICAST_MAC,
+	IFLA_BRIDGE_CFM_MEP_CONFIG_MDLEVEL,
+	IFLA_BRIDGE_CFM_MEP_CONFIG_MEPID,
+	__IFLA_BRIDGE_CFM_MEP_CONFIG_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_MEP_CONFIG_MAX (__IFLA_BRIDGE_CFM_MEP_CONFIG_MAX - 1)
+
+enum {
+	IFLA_BRIDGE_CFM_CC_CONFIG_UNSPEC,
+	IFLA_BRIDGE_CFM_CC_CONFIG_INSTANCE,
+	IFLA_BRIDGE_CFM_CC_CONFIG_ENABLE,
+	IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL,
+	IFLA_BRIDGE_CFM_CC_CONFIG_EXP_MAID,
+	__IFLA_BRIDGE_CFM_CC_CONFIG_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_CC_CONFIG_MAX (__IFLA_BRIDGE_CFM_CC_CONFIG_MAX - 1)
+
+enum {
+	IFLA_BRIDGE_CFM_CC_PEER_MEP_UNSPEC,
+	IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE,
+	IFLA_BRIDGE_CFM_CC_PEER_MEPID,
+	__IFLA_BRIDGE_CFM_CC_PEER_MEP_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_CC_PEER_MEP_MAX (__IFLA_BRIDGE_CFM_CC_PEER_MEP_MAX - 1)
+
+enum {
+	IFLA_BRIDGE_CFM_CC_RDI_UNSPEC,
+	IFLA_BRIDGE_CFM_CC_RDI_INSTANCE,
+	IFLA_BRIDGE_CFM_CC_RDI_RDI,
+	__IFLA_BRIDGE_CFM_CC_RDI_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_CC_RDI_MAX (__IFLA_BRIDGE_CFM_CC_RDI_MAX - 1)
+
+enum {
+	IFLA_BRIDGE_CFM_CC_CCM_TX_UNSPEC,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_SEQ_NO_UPDATE,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_PERIOD,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV_VALUE,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV_VALUE,
+	__IFLA_BRIDGE_CFM_CC_CCM_TX_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_CC_CCM_TX_MAX (__IFLA_BRIDGE_CFM_CC_CCM_TX_MAX - 1)
+
 struct bridge_stp_xstats {
 	__u64 transition_blk;
 	__u64 transition_fwd;
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 9b814c92de12..ffc9ca1f2bdb 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -779,6 +779,7 @@ enum {
 #define RTEXT_FILTER_BRVLAN_COMPRESSED	(1 << 2)
 #define	RTEXT_FILTER_SKIP_STATS	(1 << 3)
 #define RTEXT_FILTER_MRP	(1 << 4)
+#define RTEXT_FILTER_CFM_CONFIG	(1 << 5)
 
 /* End of information exported to user level */
 
diff --git a/net/bridge/Makefile b/net/bridge/Makefile
index ddc0a9192348..4702702a74d3 100644
--- a/net/bridge/Makefile
+++ b/net/bridge/Makefile
@@ -28,4 +28,4 @@ obj-$(CONFIG_NETFILTER) += netfilter/
 
 bridge-$(CONFIG_BRIDGE_MRP)	+= br_mrp_switchdev.o br_mrp.o br_mrp_netlink.o
 
-bridge-$(CONFIG_BRIDGE_CFM)	+= br_cfm.o
+bridge-$(CONFIG_BRIDGE_CFM)	+= br_cfm.o br_cfm_netlink.o
diff --git a/net/bridge/br_cfm.c b/net/bridge/br_cfm.c
index d928de5de155..c8de462c2fd4 100644
--- a/net/bridge/br_cfm.c
+++ b/net/bridge/br_cfm.c
@@ -816,6 +816,11 @@ int br_cfm_cc_ccm_tx(struct net_bridge *br, const u32
instance,
 	return 0;
 }
 
+bool br_cfm_created(struct net_bridge *br)
+{
+	return !hlist_empty(&br->mep_list);
+}
+
 /* Deletes the CFM instances on a specific bridge port
  */
 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *port)
diff --git a/net/bridge/br_cfm_netlink.c b/net/bridge/br_cfm_netlink.c
new file mode 100644
index 000000000000..6558fa95630e
--- /dev/null
+++ b/net/bridge/br_cfm_netlink.c
@@ -0,0 +1,453 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <net/genetlink.h>
+
+#include "br_private.h"
+#include "br_private_cfm.h"
+
+static const struct nla_policy
+br_cfm_mep_create_policy[IFLA_BRIDGE_CFM_MEP_CREATE_MAX + 1] = {
+	[IFLA_BRIDGE_CFM_MEP_CREATE_UNSPEC]	= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_CFM_MEP_CREATE_INSTANCE]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_MEP_CREATE_DOMAIN]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_MEP_CREATE_DIRECTION]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_MEP_CREATE_IFINDEX]	= { .type = NLA_U32 },
+};
+
+static const struct nla_policy
+br_cfm_mep_delete_policy[IFLA_BRIDGE_CFM_MEP_DELETE_MAX + 1] = {
+	[IFLA_BRIDGE_CFM_MEP_DELETE_UNSPEC]	= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_CFM_MEP_DELETE_INSTANCE]	= { .type = NLA_U32 },
+};
+
+static const struct nla_policy
+br_cfm_mep_config_policy[IFLA_BRIDGE_CFM_MEP_CONFIG_MAX + 1] = {
+	[IFLA_BRIDGE_CFM_MEP_CONFIG_UNSPEC]		= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_CFM_MEP_CONFIG_INSTANCE]		= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_MEP_CONFIG_UNICAST_MAC]	= NLA_POLICY_ETH_ADDR,
+	[IFLA_BRIDGE_CFM_MEP_CONFIG_MDLEVEL]		= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_MEP_CONFIG_MEPID]		= { .type = NLA_U32 },
+};
+
+static const struct nla_policy
+br_cfm_cc_config_policy[IFLA_BRIDGE_CFM_CC_CONFIG_MAX + 1] = {
+	[IFLA_BRIDGE_CFM_CC_CONFIG_UNSPEC]		= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_CFM_CC_CONFIG_INSTANCE]		= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_CONFIG_ENABLE]		= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_CONFIG_EXP_MAID]	= {
+	.type = NLA_BINARY, .len = CFM_MAID_LENGTH },
+};
+
+static const struct nla_policy
+br_cfm_cc_peer_mep_policy[IFLA_BRIDGE_CFM_CC_PEER_MEP_MAX + 1] = {
+	[IFLA_BRIDGE_CFM_CC_PEER_MEP_UNSPEC]	= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_PEER_MEPID]		= { .type = NLA_U32 },
+};
+
+static const struct nla_policy
+br_cfm_cc_rdi_policy[IFLA_BRIDGE_CFM_CC_RDI_MAX + 1] = {
+	[IFLA_BRIDGE_CFM_CC_RDI_UNSPEC]		= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_CFM_CC_RDI_INSTANCE]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_RDI_RDI]		= { .type = NLA_U32 },
+};
+
+static const struct nla_policy
+br_cfm_cc_ccm_tx_policy[IFLA_BRIDGE_CFM_CC_CCM_TX_MAX + 1] = {
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_UNSPEC]		= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE]		= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC]		= NLA_POLICY_ETH_ADDR,
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_SEQ_NO_UPDATE]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_PERIOD]		= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV]		= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV_VALUE]	= { .type = NLA_U8 },
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV]		= { .type = NLA_U32 },
+	[IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV_VALUE]	= { .type = NLA_U8 },
+};
+
+static const struct nla_policy
+br_cfm_policy[IFLA_BRIDGE_CFM_MAX + 1] = {
+	[IFLA_BRIDGE_CFM_UNSPEC]		= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_CFM_MEP_CREATE]		+			
NLA_POLICY_NESTED(br_cfm_mep_create_policy),
+	[IFLA_BRIDGE_CFM_MEP_DELETE]		+			
NLA_POLICY_NESTED(br_cfm_mep_delete_policy),
+	[IFLA_BRIDGE_CFM_MEP_CONFIG]		+			
NLA_POLICY_NESTED(br_cfm_mep_config_policy),
+	[IFLA_BRIDGE_CFM_CC_CONFIG]		+				NLA_POLICY_NESTED(br_cfm_cc_config_policy),
+	[IFLA_BRIDGE_CFM_CC_PEER_MEP_ADD]	+			
NLA_POLICY_NESTED(br_cfm_cc_peer_mep_policy),
+	[IFLA_BRIDGE_CFM_CC_PEER_MEP_REMOVE]	+			
NLA_POLICY_NESTED(br_cfm_cc_peer_mep_policy),
+	[IFLA_BRIDGE_CFM_CC_RDI]		+				NLA_POLICY_NESTED(br_cfm_cc_rdi_policy),
+	[IFLA_BRIDGE_CFM_CC_CCM_TX]		+				NLA_POLICY_NESTED(br_cfm_cc_ccm_tx_policy),
+};
+
+static int br_mep_create_parse(struct net_bridge *br, struct nlattr *attr,
+			       struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_MEP_CREATE_MAX + 1];
+	struct br_cfm_mep_create create;
+	u32 instance;
+	int err;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_MEP_CREATE_MAX, attr,
+			       br_cfm_mep_create_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[IFLA_BRIDGE_CFM_MEP_CREATE_INSTANCE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing INSTANCE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_MEP_CREATE_DOMAIN]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing DOMAIN attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_MEP_CREATE_DIRECTION]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing DIRECTION attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_MEP_CREATE_IFINDEX]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing IFINDEX attribute");
+		return -EINVAL;
+	}
+
+	memset(&create, 0, sizeof(create));
+
+	instance =  nla_get_u32(tb[IFLA_BRIDGE_CFM_MEP_CREATE_INSTANCE]);
+	create.domain = nla_get_u32(tb[IFLA_BRIDGE_CFM_MEP_CREATE_DOMAIN]);
+	create.direction = nla_get_u32(tb[IFLA_BRIDGE_CFM_MEP_CREATE_DIRECTION]);
+	create.ifindex = nla_get_u32(tb[IFLA_BRIDGE_CFM_MEP_CREATE_IFINDEX]);
+
+	return br_cfm_mep_create(br, instance, &create, extack);
+}
+
+static int br_mep_delete_parse(struct net_bridge *br, struct nlattr *attr,
+			       struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_MEP_DELETE_MAX + 1];
+	u32 instance;
+	int err;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_MEP_DELETE_MAX, attr,
+			       br_cfm_mep_delete_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[IFLA_BRIDGE_CFM_MEP_DELETE_INSTANCE]) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Missing INSTANCE attribute");
+		return -EINVAL;
+	}
+
+	instance =  nla_get_u32(tb[IFLA_BRIDGE_CFM_MEP_DELETE_INSTANCE]);
+
+	return br_cfm_mep_delete(br, instance, extack);
+}
+
+static int br_mep_config_parse(struct net_bridge *br, struct nlattr *attr,
+			       struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_MEP_CONFIG_MAX + 1];
+	struct br_cfm_mep_config config;
+	u32 instance;
+	int err;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_MEP_CONFIG_MAX, attr,
+			       br_cfm_mep_config_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[IFLA_BRIDGE_CFM_MEP_CONFIG_INSTANCE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing INSTANCE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_MEP_CONFIG_UNICAST_MAC]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing UNICAST_MAC attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_MEP_CONFIG_MDLEVEL]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing MDLEVEL attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_MEP_CONFIG_MEPID]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing MEPID attribute");
+		return -EINVAL;
+	}
+
+	memset(&config, 0, sizeof(config));
+
+	instance =  nla_get_u32(tb[IFLA_BRIDGE_CFM_MEP_CONFIG_INSTANCE]);
+	nla_memcpy(&config.unicast_mac.addr,
+		   tb[IFLA_BRIDGE_CFM_MEP_CONFIG_UNICAST_MAC],
+		   sizeof(config.unicast_mac.addr));
+	config.mdlevel = nla_get_u32(tb[IFLA_BRIDGE_CFM_MEP_CONFIG_MDLEVEL]);
+	config.mepid = nla_get_u32(tb[IFLA_BRIDGE_CFM_MEP_CONFIG_MEPID]);
+
+	return br_cfm_mep_config_set(br, instance, &config, extack);
+}
+
+static int br_cc_config_parse(struct net_bridge *br, struct nlattr *attr,
+			      struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_CC_CONFIG_MAX + 1];
+	struct br_cfm_cc_config config;
+	u32 instance;
+	int err;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_CC_CONFIG_MAX, attr,
+			       br_cfm_cc_config_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[IFLA_BRIDGE_CFM_CC_CONFIG_INSTANCE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing INSTANCE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CONFIG_ENABLE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing ENABLE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing INTERVAL attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CONFIG_EXP_MAID]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing MAID attribute");
+		return -EINVAL;
+	}
+
+	memset(&config, 0, sizeof(config));
+
+	instance =  nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CONFIG_INSTANCE]);
+	config.enable = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CONFIG_ENABLE]);
+	config.exp_interval = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL]);
+	nla_memcpy(&config.exp_maid.data, tb[IFLA_BRIDGE_CFM_CC_CONFIG_EXP_MAID],
+		   sizeof(config.exp_maid.data));
+
+	return br_cfm_cc_config_set(br, instance, &config, extack);
+}
+
+static int br_cc_peer_mep_add_parse(struct net_bridge *br, struct nlattr *attr,
+				    struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_MAX + 1];
+	u32 instance, peer_mep_id;
+	int err;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_CC_PEER_MEP_MAX, attr,
+			       br_cfm_cc_peer_mep_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing INSTANCE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_PEER_MEPID]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing PEER_MEP_ID attribute");
+		return -EINVAL;
+	}
+
+	instance =  nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE]);
+	peer_mep_id =  nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_PEER_MEPID]);
+
+	return br_cfm_cc_peer_mep_add(br, instance, peer_mep_id, extack);
+}
+
+static int br_cc_peer_mep_remove_parse(struct net_bridge *br, struct nlattr
*attr,
+				       struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_MAX + 1];
+	u32 instance, peer_mep_id;
+	int err;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_CC_PEER_MEP_MAX, attr,
+			       br_cfm_cc_peer_mep_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing INSTANCE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_PEER_MEPID]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing PEER_MEP_ID attribute");
+		return -EINVAL;
+	}
+
+	instance =  nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE]);
+	peer_mep_id =  nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_PEER_MEPID]);
+
+	return br_cfm_cc_peer_mep_remove(br, instance, peer_mep_id, extack);
+}
+
+static int br_cc_rdi_parse(struct net_bridge *br, struct nlattr *attr,
+			   struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_CC_RDI_MAX + 1];
+	u32 instance, rdi;
+	int err;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_CC_RDI_MAX, attr,
+			       br_cfm_cc_rdi_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[IFLA_BRIDGE_CFM_CC_RDI_INSTANCE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing INSTANCE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_RDI_RDI]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing RDI attribute");
+		return -EINVAL;
+	}
+
+	instance =  nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_RDI_INSTANCE]);
+	rdi =  nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_RDI_RDI]);
+
+	return br_cfm_cc_rdi_set(br, instance, rdi, extack);
+}
+
+static int br_cc_ccm_tx_parse(struct net_bridge *br, struct nlattr *attr,
+			      struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_CC_CCM_TX_MAX + 1];
+	struct br_cfm_cc_ccm_tx_info tx_info;
+	u32 instance;
+	int err;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_CC_CCM_TX_MAX, attr,
+			       br_cfm_cc_ccm_tx_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing INSTANCE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing DMAC attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CCM_TX_SEQ_NO_UPDATE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing SEQ_NO_UPDATE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CCM_TX_PERIOD]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing PERIOD attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing IF_TLV attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV_VALUE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing IF_TLV_VALUE attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing PORT_TLV attribute");
+		return -EINVAL;
+	}
+	if (!tb[IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV_VALUE]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing PORT_TLV_VALUE attribute");
+		return -EINVAL;
+	}
+
+	memset(&tx_info, 0, sizeof(tx_info));
+
+	instance = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_RDI_INSTANCE]);
+	nla_memcpy(&tx_info.dmac.addr,
+		   tb[IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC],
+		   sizeof(tx_info.dmac.addr));
+	tx_info.seq_no_update =
nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CCM_TX_SEQ_NO_UPDATE]);
+	tx_info.period = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CCM_TX_PERIOD]);
+	tx_info.if_tlv = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV]);
+	tx_info.if_tlv_value = nla_get_u8(tb[IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV_VALUE]);
+	tx_info.port_tlv = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV]);
+	tx_info.port_tlv_value =
nla_get_u8(tb[IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV_VALUE]);
+
+	return br_cfm_cc_ccm_tx(br, instance, &tx_info, extack);
+}
+
+int br_cfm_parse(struct net_bridge *br, struct net_bridge_port *p,
+		 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_CFM_MAX + 1];
+	int err;
+
+	/* When this function is called for a port then the br pointer is
+	 * invalid, therefor set the br to point correctly
+	 */
+	if (p)
+		br = p->br;
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_CFM_MAX, attr,
+			       br_cfm_policy, extack);
+	if (err)
+		return err;
+
+	if (tb[IFLA_BRIDGE_CFM_MEP_CREATE]) {
+		err = br_mep_create_parse(br, tb[IFLA_BRIDGE_CFM_MEP_CREATE],
+					  extack);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_CFM_MEP_DELETE]) {
+		err = br_mep_delete_parse(br, tb[IFLA_BRIDGE_CFM_MEP_DELETE],
+					  extack);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_CFM_MEP_CONFIG]) {
+		err = br_mep_config_parse(br, tb[IFLA_BRIDGE_CFM_MEP_CONFIG],
+					  extack);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_CFM_CC_CONFIG]) {
+		err = br_cc_config_parse(br, tb[IFLA_BRIDGE_CFM_CC_CONFIG],
+					 extack);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_ADD]) {
+		err = br_cc_peer_mep_add_parse(br, tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_ADD],
+					       extack);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_REMOVE]) {
+		err = br_cc_peer_mep_remove_parse(br, tb[IFLA_BRIDGE_CFM_CC_PEER_MEP_REMOVE],
+						  extack);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_CFM_CC_RDI]) {
+		err = br_cc_rdi_parse(br, tb[IFLA_BRIDGE_CFM_CC_RDI],
+				      extack);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_CFM_CC_CCM_TX]) {
+		err = br_cc_ccm_tx_parse(br, tb[IFLA_BRIDGE_CFM_CC_CCM_TX],
+					 extack);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 92d64abffa87..431ee2b06dc1 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -700,6 +700,11 @@ static int br_afspec(struct net_bridge *br,
 			if (err)
 				return err;
 			break;
+		case IFLA_BRIDGE_CFM:
+			err = br_cfm_parse(br, p, attr, cmd, extack);
+			if (err)
+				return err;
+			break;
 		}
 	}
 
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index f7c41380de4d..6a5db0553f19 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1459,10 +1459,25 @@ static inline int br_mrp_fill_info(struct sk_buff *skb,
struct net_bridge *br)
 
 #endif
 
-/* br_mrp.c */
+/* br_cfm.c */
 #if IS_ENABLED(CONFIG_BRIDGE_CFM)
+int br_cfm_parse(struct net_bridge *br, struct net_bridge_port *p,
+		 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
+bool br_cfm_created(struct net_bridge *br);
 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *p);
 #else
+static inline int br_cfm_parse(struct net_bridge *br, struct net_bridge_port
*p,
+			       struct nlattr *attr, int cmd,
+			       struct netlink_ext_ack *extack)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline bool br_cfm_created(struct net_bridge *br)
+{
+	return false;
+}
+
 static inline void br_cfm_port_del(struct net_bridge *br,
 				   struct net_bridge_port *p)
 {
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 08/10] bridge: cfm: Netlink GET configuration Interface.

This is the implementation of CFM netlink configuration
get information interface.

Add new nested netlink attributes. These attributes are used by the
user space to get configuration information.

GETLINK:
    Request filter RTEXT_FILTER_CFM_CONFIG:
    Indicating that CFM configuration information must be delivered.

    IFLA_BRIDGE_CFM:
        Points to the CFM information.

    IFLA_BRIDGE_CFM_MEP_CREATE_INFO:
        This indicate that MEP instance create parameters are following.
    IFLA_BRIDGE_CFM_MEP_CONFIG_INFO:
        This indicate that MEP instance config parameters are following.
    IFLA_BRIDGE_CFM_CC_CONFIG_INFO:
        This indicate that MEP instance CC functionality
        parameters are following.
    IFLA_BRIDGE_CFM_CC_RDI_INFO:
        This indicate that CC transmitted CCM PDU RDI
        parameters are following.
    IFLA_BRIDGE_CFM_CC_CCM_TX_INFO:
        This indicate that CC transmitted CCM PDU parameters are
        following.
    IFLA_BRIDGE_CFM_CC_PEER_MEP_INFO:
        This indicate that the added peer MEP IDs are following.

CFM nested attribute has the following attributes in next level.

GETLINK RTEXT_FILTER_CFM_CONFIG:
    IFLA_BRIDGE_CFM_MEP_CREATE_INSTANCE:
        The created MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_MEP_CREATE_DOMAIN:
        The created MEP domain.
        The type is u32 (br_cfm_domain).
        It must be BR_CFM_PORT.
        This means that CFM frames are transmitted and received
        directly on the port - untagged. Not in a VLAN.
    IFLA_BRIDGE_CFM_MEP_CREATE_DIRECTION:
        The created MEP direction.
        The type is u32 (br_cfm_mep_direction).
        It must be BR_CFM_MEP_DIRECTION_DOWN.
        This means that CFM frames are transmitted and received on
        the port. Not in the bridge.
    IFLA_BRIDGE_CFM_MEP_CREATE_IFINDEX:
        The created MEP residence port ifindex.
        The type is u32 (ifindex).

    IFLA_BRIDGE_CFM_MEP_DELETE_INSTANCE:
        The deleted MEP instance number.
        The type is u32.

    IFLA_BRIDGE_CFM_MEP_CONFIG_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_MEP_CONFIG_UNICAST_MAC:
        The configured MEP unicast MAC address.
        The type is 6*u8 (array).
        This is used as SMAC in all transmitted CFM frames.
    IFLA_BRIDGE_CFM_MEP_CONFIG_MDLEVEL:
        The configured MEP unicast MD level.
        The type is u32.
        It must be in the range 1-7.
        No CFM frames are passing through this MEP on lower levels.
    IFLA_BRIDGE_CFM_MEP_CONFIG_MEPID:
        The configured MEP ID.
        The type is u32.
        It must be in the range 0-0x1FFF.
        This MEP ID is inserted in any transmitted CCM frame.

    IFLA_BRIDGE_CFM_CC_CONFIG_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_CONFIG_ENABLE:
        The Continuity Check (CC) functionality is enabled or disabled.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL:
        The CC expected receive interval of CCM frames.
        The type is u32 (br_cfm_ccm_interval).
        This is also the transmission interval of CCM frames when enabled.
    IFLA_BRIDGE_CFM_CC_CONFIG_EXP_MAID:
        The CC expected receive MAID in CCM frames.
        The type is CFM_MAID_LENGTH*u8.
        This is MAID is also inserted in transmitted CCM frames.

    IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_PEER_MEPID:
        The CC Peer MEP ID added.
        The type is u32.
        When a Peer MEP ID is added and CC is enabled it is expected to
        receive CCM frames from that Peer MEP.

    IFLA_BRIDGE_CFM_CC_RDI_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_RDI_RDI:
        The RDI that is inserted in transmitted CCM PDU.
        The type is u32 (bool).

    IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE:
        The configured MEP instance number.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC:
        The transmitted CCM frame destination MAC address.
        The type is 6*u8 (array).
        This is used as DMAC in all transmitted CFM frames.
    IFLA_BRIDGE_CFM_CC_CCM_TX_SEQ_NO_UPDATE:
        The transmitted CCM frame update (increment) of sequence
        number is enabled or disabled.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_CCM_TX_PERIOD:
        The period of time where CCM frame are transmitted.
        The type is u32.
        The time is given in seconds. SETLINK IFLA_BRIDGE_CFM_CC_CCM_TX
        must be done before timeout to keep transmission alive.
        When period is zero any ongoing CCM frame transmission
        will be stopped.
    IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV:
        The transmitted CCM frame update with Interface Status TLV
        is enabled or disabled.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV_VALUE:
        The transmitted Interface Status TLV value field.
        The type is u8.
    IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV:
        The transmitted CCM frame update with Port Status TLV is enabled
        or disabled.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV_VALUE:
        The transmitted Port Status TLV value field.
        The type is u8.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
---
 include/uapi/linux/if_bridge.h |   6 ++
 net/bridge/br_cfm_netlink.c    | 161 +++++++++++++++++++++++++++++++++
 net/bridge/br_netlink.c        |  29 +++++-
 net/bridge/br_private.h        |   6 ++
 4 files changed, 200 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 94cc9444d749..b8b4491922d9 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -339,6 +339,12 @@ enum {
 	IFLA_BRIDGE_CFM_CC_PEER_MEP_REMOVE,
 	IFLA_BRIDGE_CFM_CC_RDI,
 	IFLA_BRIDGE_CFM_CC_CCM_TX,
+	IFLA_BRIDGE_CFM_MEP_CREATE_INFO,
+	IFLA_BRIDGE_CFM_MEP_CONFIG_INFO,
+	IFLA_BRIDGE_CFM_CC_CONFIG_INFO,
+	IFLA_BRIDGE_CFM_CC_RDI_INFO,
+	IFLA_BRIDGE_CFM_CC_CCM_TX_INFO,
+	IFLA_BRIDGE_CFM_CC_PEER_MEP_INFO,
 	__IFLA_BRIDGE_CFM_MAX,
 };
 
diff --git a/net/bridge/br_cfm_netlink.c b/net/bridge/br_cfm_netlink.c
index 6558fa95630e..e7bfb8e003e8 100644
--- a/net/bridge/br_cfm_netlink.c
+++ b/net/bridge/br_cfm_netlink.c
@@ -451,3 +451,164 @@ int br_cfm_parse(struct net_bridge *br, struct
net_bridge_port *p,
 
 	return 0;
 }
+
+int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br)
+{
+	struct br_cfm_peer_mep *peer_mep;
+	struct br_cfm_mep *mep;
+	struct nlattr *tb;
+
+	hlist_for_each_entry_rcu(mep, &br->mep_list, head) {
+		tb = nla_nest_start(skb, IFLA_BRIDGE_CFM_MEP_CREATE_INFO);
+		if (!tb)
+			goto nla_info_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_MEP_CREATE_INSTANCE,
+				mep->instance))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_MEP_CREATE_DOMAIN,
+				mep->create.domain))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_MEP_CREATE_DIRECTION,
+				mep->create.direction))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_MEP_CREATE_IFINDEX,
+				mep->create.ifindex))
+			goto nla_put_failure;
+
+		nla_nest_end(skb, tb);
+
+		tb = nla_nest_start(skb, IFLA_BRIDGE_CFM_MEP_CONFIG_INFO);
+
+		if (!tb)
+			goto nla_info_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_MEP_CONFIG_INSTANCE,
+				mep->instance))
+			goto nla_put_failure;
+
+		if (nla_put(skb, IFLA_BRIDGE_CFM_MEP_CONFIG_UNICAST_MAC,
+			    sizeof(mep->config.unicast_mac.addr),
+			    mep->config.unicast_mac.addr))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_MEP_CONFIG_MDLEVEL,
+				mep->config.mdlevel))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_MEP_CONFIG_MEPID,
+				mep->config.mepid))
+			goto nla_put_failure;
+
+		nla_nest_end(skb, tb);
+
+		tb = nla_nest_start(skb, IFLA_BRIDGE_CFM_CC_CONFIG_INFO);
+
+		if (!tb)
+			goto nla_info_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_CONFIG_INSTANCE,
+				mep->instance))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_CONFIG_ENABLE,
+				mep->cc_config.enable))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL,
+				mep->cc_config.exp_interval))
+			goto nla_put_failure;
+
+		if (nla_put(skb, IFLA_BRIDGE_CFM_CC_CONFIG_EXP_MAID,
+			    sizeof(mep->cc_config.exp_maid.data),
+			    mep->cc_config.exp_maid.data))
+			goto nla_put_failure;
+
+		nla_nest_end(skb, tb);
+
+		tb = nla_nest_start(skb, IFLA_BRIDGE_CFM_CC_RDI_INFO);
+
+		if (!tb)
+			goto nla_info_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_RDI_INSTANCE,
+				mep->instance))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_RDI_RDI,
+				mep->rdi))
+			goto nla_put_failure;
+
+		nla_nest_end(skb, tb);
+
+		tb = nla_nest_start(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_INFO);
+
+		if (!tb)
+			goto nla_info_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE,
+				mep->instance))
+			goto nla_put_failure;
+
+		if (nla_put(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC,
+			    sizeof(mep->cc_ccm_tx_info.dmac),
+			    mep->cc_ccm_tx_info.dmac.addr))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_SEQ_NO_UPDATE,
+				mep->cc_ccm_tx_info.seq_no_update))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_PERIOD,
+				mep->cc_ccm_tx_info.period))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV,
+				mep->cc_ccm_tx_info.if_tlv))
+			goto nla_put_failure;
+
+		if (nla_put_u8(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV_VALUE,
+			       mep->cc_ccm_tx_info.if_tlv_value))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV,
+				mep->cc_ccm_tx_info.port_tlv))
+			goto nla_put_failure;
+
+		if (nla_put_u8(skb, IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV_VALUE,
+			       mep->cc_ccm_tx_info.port_tlv_value))
+			goto nla_put_failure;
+
+		nla_nest_end(skb, tb);
+
+		hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head) {
+			tb = nla_nest_start(skb,
+					    IFLA_BRIDGE_CFM_CC_PEER_MEP_INFO);
+
+			if (!tb)
+				goto nla_info_failure;
+
+			if (nla_put_u32(skb,
+					IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE,
+					mep->instance))
+				goto nla_put_failure;
+
+			if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_PEER_MEPID,
+					peer_mep->mepid))
+				goto nla_put_failure;
+
+			nla_nest_end(skb, tb);
+		}
+	}
+
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(skb, tb);
+
+nla_info_failure:
+	return -EMSGSIZE;
+}
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 431ee2b06dc1..69bfe165ff7f 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -16,6 +16,7 @@
 
 #include "br_private.h"
 #include "br_private_stp.h"
+#include "br_private_cfm.h"
 #include "br_private_tunnel.h"
 
 static int __get_num_vlan_infos(struct net_bridge_vlan_group *vg,
@@ -426,7 +427,8 @@ static int br_fill_ifinfo(struct sk_buff *skb,
 
 	if (filter_mask & (RTEXT_FILTER_BRVLAN |
 			   RTEXT_FILTER_BRVLAN_COMPRESSED |
-			   RTEXT_FILTER_MRP)) {
+			   RTEXT_FILTER_MRP |
+			   RTEXT_FILTER_CFM_CONFIG)) {
 		af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
 		if (!af)
 			goto nla_put_failure;
@@ -475,6 +477,28 @@ static int br_fill_ifinfo(struct sk_buff *skb,
 			goto nla_put_failure;
 	}
 
+	if (filter_mask & RTEXT_FILTER_CFM_CONFIG) {
+		struct nlattr *cfm_nest = NULL;
+		int err;
+
+		if (!br_cfm_created(br) || port)
+			goto done;
+
+		cfm_nest = nla_nest_start(skb, IFLA_BRIDGE_CFM);
+		if (!cfm_nest)
+			goto nla_put_failure;
+
+		if (filter_mask & RTEXT_FILTER_CFM_CONFIG) {
+			rcu_read_lock();
+			err = br_cfm_config_fill_info(skb, br);
+			rcu_read_unlock();
+			if (err)
+				goto nla_put_failure;
+		}
+
+		nla_nest_end(skb, cfm_nest);
+	}
+
 done:
 	if (af)
 		nla_nest_end(skb, af);
@@ -538,7 +562,8 @@ int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 
 	if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
 	    !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) &&
-	    !(filter_mask & RTEXT_FILTER_MRP))
+	    !(filter_mask & RTEXT_FILTER_MRP) &&
+	    !(filter_mask & RTEXT_FILTER_CFM_CONFIG))
 		return 0;
 
 	return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 6a5db0553f19..f571bdeb5d83 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1465,6 +1465,7 @@ int br_cfm_parse(struct net_bridge *br, struct
net_bridge_port *p,
 		 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
 bool br_cfm_created(struct net_bridge *br);
 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *p);
+int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br);
 #else
 static inline int br_cfm_parse(struct net_bridge *br, struct net_bridge_port
*p,
 			       struct nlattr *attr, int cmd,
@@ -1482,6 +1483,11 @@ static inline void br_cfm_port_del(struct net_bridge *br,
 				   struct net_bridge_port *p)
 {
 }
+
+static inline int br_cfm_config_fill_info(struct sk_buff *skb, struct
net_bridge *br)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 
 /* br_netlink.c */
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 09/10] bridge: cfm: Netlink GET status Interface.

This is the implementation of CFM netlink status
get information interface.

Add new nested netlink attributes. These attributes are used by the
user space to get status information.

GETLINK:
    Request filter RTEXT_FILTER_CFM_STATUS:
    Indicating that CFM status information must be delivered.

    IFLA_BRIDGE_CFM:
        Points to the CFM information.

    IFLA_BRIDGE_CFM_MEP_STATUS_INFO:
        This indicate that the MEP instance status are following.
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO:
        This indicate that the peer MEP status are following.

CFM nested attribute has the following attributes in next level.

GETLINK RTEXT_FILTER_CFM_STATUS:
    IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE:
        The MEP instance number of the delivered status.
        The type is u32.
    IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN:
        The MEP instance received CFM PDU with unexpected Opcode.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN:
        The MEP instance received CFM PDU with unexpected version.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN:
        The MEP instance received CCM PDU with MD level lower than
        configured level. This frame is discarded.
        The type is u32 (bool).

    IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE:
        The MEP instance number of the delivered status.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID:
        The added Peer MEP ID of the delivered status.
        The type is u32.
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT:
        The CCM defect status.
        The type is u32 (bool).
        True means no CCM frame is received for 3.25 intervals.
        IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL.
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI:
        The last received CCM PDU RDI.
        The type is u32 (bool).
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE:
        The last received CCM PDU Port Status TLV value field.
        The type is u8.
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE:
        The last received CCM PDU Interface Status TLV value field.
        The type is u8.
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN:
        A CCM frame has been received from Peer MEP.
        The type is u32 (bool).
        This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN:
        A CCM frame with TLV has been received from Peer MEP.
        The type is u32 (bool).
        This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
    IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN:
        A CCM frame with unexpected sequence number has been received
        from Peer MEP.
        The type is u32 (bool).
        When a sequence number is not one higher than previously received
        then it is unexpected.
        This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
---
 include/uapi/linux/if_bridge.h |  29 +++++++++
 include/uapi/linux/rtnetlink.h |   1 +
 net/bridge/br_cfm_netlink.c    | 105 +++++++++++++++++++++++++++++++++
 net/bridge/br_netlink.c        |  16 ++++-
 net/bridge/br_private.h        |   6 ++
 5 files changed, 154 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index b8b4491922d9..d975e1223884 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -345,6 +345,8 @@ enum {
 	IFLA_BRIDGE_CFM_CC_RDI_INFO,
 	IFLA_BRIDGE_CFM_CC_CCM_TX_INFO,
 	IFLA_BRIDGE_CFM_CC_PEER_MEP_INFO,
+	IFLA_BRIDGE_CFM_MEP_STATUS_INFO,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO,
 	__IFLA_BRIDGE_CFM_MAX,
 };
 
@@ -424,6 +426,33 @@ enum {
 
 #define IFLA_BRIDGE_CFM_CC_CCM_TX_MAX (__IFLA_BRIDGE_CFM_CC_CCM_TX_MAX - 1)
 
+enum {
+	IFLA_BRIDGE_CFM_MEP_STATUS_UNSPEC,
+	IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE,
+	IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN,
+	IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN,
+	IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN,
+	__IFLA_BRIDGE_CFM_MEP_STATUS_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_MEP_STATUS_MAX (__IFLA_BRIDGE_CFM_MEP_STATUS_MAX - 1)
+
+enum {
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_UNSPEC,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN,
+	IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN,
+	__IFLA_BRIDGE_CFM_CC_PEER_STATUS_MAX,
+};
+
+#define IFLA_BRIDGE_CFM_CC_PEER_STATUS_MAX
(__IFLA_BRIDGE_CFM_CC_PEER_STATUS_MAX - 1)
+
 struct bridge_stp_xstats {
 	__u64 transition_blk;
 	__u64 transition_fwd;
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index ffc9ca1f2bdb..fdd408f6a5d2 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -780,6 +780,7 @@ enum {
 #define	RTEXT_FILTER_SKIP_STATS	(1 << 3)
 #define RTEXT_FILTER_MRP	(1 << 4)
 #define RTEXT_FILTER_CFM_CONFIG	(1 << 5)
+#define RTEXT_FILTER_CFM_STATUS	(1 << 6)
 
 /* End of information exported to user level */
 
diff --git a/net/bridge/br_cfm_netlink.c b/net/bridge/br_cfm_netlink.c
index e7bfb8e003e8..506e352cc763 100644
--- a/net/bridge/br_cfm_netlink.c
+++ b/net/bridge/br_cfm_netlink.c
@@ -612,3 +612,108 @@ int br_cfm_config_fill_info(struct sk_buff *skb, struct
net_bridge *br)
 nla_info_failure:
 	return -EMSGSIZE;
 }
+
+int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br)
+{
+	struct br_cfm_peer_mep *peer_mep;
+	struct br_cfm_mep *mep;
+	struct nlattr *tb;
+
+	hlist_for_each_entry_rcu(mep, &br->mep_list, head) {
+		tb = nla_nest_start(skb, IFLA_BRIDGE_CFM_MEP_STATUS_INFO);
+		if (!tb)
+			goto nla_info_failure;
+
+		if (nla_put_u32(skb, IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE,
+				mep->instance))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb,
+				IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN,
+				mep->status.opcode_unexp_seen))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb,
+				IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN,
+				mep->status.version_unexp_seen))
+			goto nla_put_failure;
+
+		if (nla_put_u32(skb,
+				IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN,
+				mep->status.rx_level_low_seen))
+			goto nla_put_failure;
+
+		/* Clear all 'seen' indications */
+		mep->status.opcode_unexp_seen = false;
+		mep->status.version_unexp_seen = false;
+		mep->status.rx_level_low_seen = false;
+
+		nla_nest_end(skb, tb);
+
+		hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head) {
+			tb = nla_nest_start(skb,
+					    IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO);
+			if (!tb)
+				goto nla_info_failure;
+
+			if (nla_put_u32(skb,
+					IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE,
+					mep->instance))
+				goto nla_put_failure;
+
+			if (nla_put_u32(skb,
+					IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID,
+					peer_mep->mepid))
+				goto nla_put_failure;
+
+			if (nla_put_u32(skb,
+					IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT,
+					peer_mep->cc_status.ccm_defect))
+				goto nla_put_failure;
+
+			if (nla_put_u32(skb, IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI,
+					peer_mep->cc_status.rdi))
+				goto nla_put_failure;
+
+			if (nla_put_u8(skb,
+				       IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE,
+				       peer_mep->cc_status.port_tlv_value))
+				goto nla_put_failure;
+
+			if (nla_put_u8(skb,
+				       IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE,
+				       peer_mep->cc_status.if_tlv_value))
+				goto nla_put_failure;
+
+			if (nla_put_u32(skb,
+					IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN,
+					peer_mep->cc_status.seen))
+				goto nla_put_failure;
+
+			if (nla_put_u32(skb,
+					IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN,
+					peer_mep->cc_status.tlv_seen))
+				goto nla_put_failure;
+
+			if (nla_put_u32(skb,
+					IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN,
+					peer_mep->cc_status.seq_unexp_seen))
+				goto nla_put_failure;
+
+			/* Clear all 'seen' indications */
+			peer_mep->cc_status.seen = false;
+			peer_mep->cc_status.tlv_seen = false;
+			peer_mep->cc_status.seq_unexp_seen = false;
+
+			nla_nest_end(skb, tb);
+		}
+	}
+
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(skb, tb);
+
+nla_info_failure:
+	return -EMSGSIZE;
+}
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 69bfe165ff7f..68c2ed87e26b 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -428,7 +428,8 @@ static int br_fill_ifinfo(struct sk_buff *skb,
 	if (filter_mask & (RTEXT_FILTER_BRVLAN |
 			   RTEXT_FILTER_BRVLAN_COMPRESSED |
 			   RTEXT_FILTER_MRP |
-			   RTEXT_FILTER_CFM_CONFIG)) {
+			   RTEXT_FILTER_CFM_CONFIG |
+			   RTEXT_FILTER_CFM_STATUS)) {
 		af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
 		if (!af)
 			goto nla_put_failure;
@@ -477,7 +478,7 @@ static int br_fill_ifinfo(struct sk_buff *skb,
 			goto nla_put_failure;
 	}
 
-	if (filter_mask & RTEXT_FILTER_CFM_CONFIG) {
+	if (filter_mask & (RTEXT_FILTER_CFM_CONFIG | RTEXT_FILTER_CFM_STATUS)) {
 		struct nlattr *cfm_nest = NULL;
 		int err;
 
@@ -496,6 +497,14 @@ static int br_fill_ifinfo(struct sk_buff *skb,
 				goto nla_put_failure;
 		}
 
+		if (filter_mask & RTEXT_FILTER_CFM_STATUS) {
+			rcu_read_lock();
+			err = br_cfm_status_fill_info(skb, br);
+			rcu_read_unlock();
+			if (err)
+				goto nla_put_failure;
+		}
+
 		nla_nest_end(skb, cfm_nest);
 	}
 
@@ -563,7 +572,8 @@ int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 	if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
 	    !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) &&
 	    !(filter_mask & RTEXT_FILTER_MRP) &&
-	    !(filter_mask & RTEXT_FILTER_CFM_CONFIG))
+	    !(filter_mask & RTEXT_FILTER_CFM_CONFIG) &&
+	    !(filter_mask & RTEXT_FILTER_CFM_STATUS))
 		return 0;
 
 	return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index f571bdeb5d83..228635b350a2 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1466,6 +1466,7 @@ int br_cfm_parse(struct net_bridge *br, struct
net_bridge_port *p,
 bool br_cfm_created(struct net_bridge *br);
 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *p);
 int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br);
+int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br);
 #else
 static inline int br_cfm_parse(struct net_bridge *br, struct net_bridge_port
*p,
 			       struct nlattr *attr, int cmd,
@@ -1488,6 +1489,11 @@ static inline int br_cfm_config_fill_info(struct sk_buff
*skb, struct net_bridge
 {
 	return -EOPNOTSUPP;
 }
+
+static inline int br_cfm_status_fill_info(struct sk_buff *skb, struct
net_bridge *br)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 
 /* br_netlink.c */
-- 
2.28.0

Henrik Bjoernlund

2020-Oct-12 14:04 UTC

head link

[Bridge] [PATCH net-next v5 10/10] bridge: cfm: Netlink Notifications.

This is the implementation of Netlink notifications out of CFM.

Notifications are initiated whenever a state change happens in CFM.

IFLA_BRIDGE_CFM:
    Points to the CFM information.

IFLA_BRIDGE_CFM_MEP_STATUS_INFO:
    This indicate that the MEP instance status are following.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO:
    This indicate that the peer MEP status are following.

CFM nested attribute has the following attributes in next level.

IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE:
    The MEP instance number of the delivered status.
    The type is NLA_U32.
IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN:
    The MEP instance received CFM PDU with unexpected Opcode.
    The type is NLA_U32 (bool).
IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN:
    The MEP instance received CFM PDU with unexpected version.
    The type is NLA_U32 (bool).
IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN:
    The MEP instance received CCM PDU with MD level lower than
    configured level. This frame is discarded.
    The type is NLA_U32 (bool).

IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE:
    The MEP instance number of the delivered status.
    The type is NLA_U32.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID:
    The added Peer MEP ID of the delivered status.
    The type is NLA_U32.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT:
    The CCM defect status.
    The type is NLA_U32 (bool).
    True means no CCM frame is received for 3.25 intervals.
    IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI:
    The last received CCM PDU RDI.
    The type is NLA_U32 (bool).
IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE:
    The last received CCM PDU Port Status TLV value field.
    The type is NLA_U8.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE:
    The last received CCM PDU Interface Status TLV value field.
    The type is NLA_U8.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN:
    A CCM frame has been received from Peer MEP.
    The type is NLA_U32 (bool).
    This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN:
    A CCM frame with TLV has been received from Peer MEP.
    The type is NLA_U32 (bool).
    This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN:
    A CCM frame with unexpected sequence number has been received
    from Peer MEP.
    The type is NLA_U32 (bool).
    When a sequence number is not one higher than previously received
    then it is unexpected.
    This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay at nvidia.com>
---
 net/bridge/br_cfm.c         | 48 ++++++++++++++++++++++++
 net/bridge/br_cfm_netlink.c | 25 ++++++++-----
 net/bridge/br_netlink.c     | 73 ++++++++++++++++++++++++++++++++-----
 net/bridge/br_private.h     | 22 ++++++++++-
 4 files changed, 147 insertions(+), 21 deletions(-)

diff --git a/net/bridge/br_cfm.c b/net/bridge/br_cfm.c
index c8de462c2fd4..b945033934bc 100644
--- a/net/bridge/br_cfm.c
+++ b/net/bridge/br_cfm.c
@@ -138,6 +138,13 @@ static void ccm_rx_timer_start(struct br_cfm_peer_mep
*peer_mep)
 			   usecs_to_jiffies(interval_us / 4));
 }
 
+static void br_cfm_notify(int event, const struct net_bridge_port *port)
+{
+	u32 filter = RTEXT_FILTER_CFM_STATUS;
+
+	return br_info_notify(event, port->br, NULL, filter);
+}
+
 static void cc_peer_enable(struct br_cfm_peer_mep *peer_mep)
 {
 	memset(&peer_mep->cc_status, 0, sizeof(peer_mep->cc_status));
@@ -287,6 +294,7 @@ static void ccm_tx_work_expired(struct work_struct *work)
 static void ccm_rx_work_expired(struct work_struct *work)
 {
 	struct br_cfm_peer_mep *peer_mep;
+	struct net_bridge_port *b_port;
 	struct delayed_work *del_work;
 
 	del_work = to_delayed_work(work);
@@ -304,6 +312,13 @@ static void ccm_rx_work_expired(struct work_struct *work)
 		 * CCM defect detected
 		 */
 		peer_mep->cc_status.ccm_defect = true;
+
+		/* Change in CCM defect status - notify */
+		rcu_read_lock();
+		b_port = rcu_dereference(peer_mep->mep->b_port);
+		if (b_port)
+			br_cfm_notify(RTM_NEWLINK, b_port);
+		rcu_read_unlock();
 	}
 }
 
@@ -429,6 +444,9 @@ static int br_cfm_frame_rx(struct net_bridge_port *port,
struct sk_buff *skb)
 		if (peer_mep->cc_status.ccm_defect) {
 			peer_mep->cc_status.ccm_defect = false;
 
+			/* Change in CCM defect status - notify */
+			br_cfm_notify(RTM_NEWLINK, port);
+
 			/* Start CCM RX timer */
 			ccm_rx_timer_start(peer_mep);
 		}
@@ -816,6 +834,36 @@ int br_cfm_cc_ccm_tx(struct net_bridge *br, const u32
instance,
 	return 0;
 }
 
+int br_cfm_mep_count(struct net_bridge *br, u32 *count)
+{
+	struct br_cfm_mep *mep;
+
+	*count = 0;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(mep, &br->mep_list, head)
+		*count += 1;
+	rcu_read_unlock();
+
+	return 0;
+}
+
+int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count)
+{
+	struct br_cfm_peer_mep *peer_mep;
+	struct br_cfm_mep *mep;
+
+	*count = 0;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(mep, &br->mep_list, head)
+		hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head)
+			*count += 1;
+	rcu_read_unlock();
+
+	return 0;
+}
+
 bool br_cfm_created(struct net_bridge *br)
 {
 	return !hlist_empty(&br->mep_list);
diff --git a/net/bridge/br_cfm_netlink.c b/net/bridge/br_cfm_netlink.c
index 506e352cc763..57882dbbf41f 100644
--- a/net/bridge/br_cfm_netlink.c
+++ b/net/bridge/br_cfm_netlink.c
@@ -613,7 +613,9 @@ int br_cfm_config_fill_info(struct sk_buff *skb, struct
net_bridge *br)
 	return -EMSGSIZE;
 }
 
-int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br)
+int br_cfm_status_fill_info(struct sk_buff *skb,
+			    struct net_bridge *br,
+			    bool getlink)
 {
 	struct br_cfm_peer_mep *peer_mep;
 	struct br_cfm_mep *mep;
@@ -643,10 +645,13 @@ int br_cfm_status_fill_info(struct sk_buff *skb, struct
net_bridge *br)
 				mep->status.rx_level_low_seen))
 			goto nla_put_failure;
 
-		/* Clear all 'seen' indications */
-		mep->status.opcode_unexp_seen = false;
-		mep->status.version_unexp_seen = false;
-		mep->status.rx_level_low_seen = false;
+		/* Only clear if this is a GETLINK */
+		if (getlink) {
+			/* Clear all 'seen' indications */
+			mep->status.opcode_unexp_seen = false;
+			mep->status.version_unexp_seen = false;
+			mep->status.rx_level_low_seen = false;
+		}
 
 		nla_nest_end(skb, tb);
 
@@ -700,10 +705,12 @@ int br_cfm_status_fill_info(struct sk_buff *skb, struct
net_bridge *br)
 					peer_mep->cc_status.seq_unexp_seen))
 				goto nla_put_failure;
 
-			/* Clear all 'seen' indications */
-			peer_mep->cc_status.seen = false;
-			peer_mep->cc_status.tlv_seen = false;
-			peer_mep->cc_status.seq_unexp_seen = false;
+			if (getlink) { /* Only clear if this is a GETLINK */
+				/* Clear all 'seen' indications */
+				peer_mep->cc_status.seen = false;
+				peer_mep->cc_status.tlv_seen = false;
+				peer_mep->cc_status.seq_unexp_seen = false;
+			}
 
 			nla_nest_end(skb, tb);
 		}
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 68c2ed87e26b..6952d4852942 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -94,9 +94,11 @@ static size_t br_get_link_af_size_filtered(const struct
net_device *dev,
 {
 	struct net_bridge_vlan_group *vg = NULL;
 	struct net_bridge_port *p = NULL;
-	struct net_bridge *br;
-	int num_vlan_infos;
+	struct net_bridge *br = NULL;
+	u32 num_cfm_peer_mep_infos;
+	u32 num_cfm_mep_infos;
 	size_t vinfo_sz = 0;
+	int num_vlan_infos;
 
 	rcu_read_lock();
 	if (netif_is_bridge_port(dev)) {
@@ -115,6 +117,49 @@ static size_t br_get_link_af_size_filtered(const struct
net_device *dev,
 	/* Each VLAN is returned in bridge_vlan_info along with flags */
 	vinfo_sz += num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));
 
+	if (!(filter_mask & RTEXT_FILTER_CFM_STATUS))
+		return vinfo_sz;
+
+	if (!br)
+		return vinfo_sz;
+
+	/* CFM status info must be added */
+	br_cfm_mep_count(br, &num_cfm_mep_infos);
+	br_cfm_peer_mep_count(br, &num_cfm_peer_mep_infos);
+
+	vinfo_sz += nla_total_size(0);	/* IFLA_BRIDGE_CFM */
+	/* For each status struct the MEP instance (u32) is added */
+	/* MEP instance (u32) + br_cfm_mep_status */
+	vinfo_sz += num_cfm_mep_infos *
+		     /*IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE */
+		    (nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN */
+		     + nla_total_size(sizeof(u32)));
+	/* MEP instance (u32) + br_cfm_cc_peer_status */
+	vinfo_sz += num_cfm_peer_mep_infos *
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE */
+		    (nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE */
+		     + nla_total_size(sizeof(u8))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE */
+		     + nla_total_size(sizeof(u8))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN */
+		     + nla_total_size(sizeof(u32)));
+
 	return vinfo_sz;
 }
 
@@ -378,7 +423,8 @@ static int br_fill_ifvlaninfo(struct sk_buff *skb,
 static int br_fill_ifinfo(struct sk_buff *skb,
 			  const struct net_bridge_port *port,
 			  u32 pid, u32 seq, int event, unsigned int flags,
-			  u32 filter_mask, const struct net_device *dev)
+			  u32 filter_mask, const struct net_device *dev,
+			  bool getlink)
 {
 	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
 	struct nlattr *af = NULL;
@@ -499,7 +545,7 @@ static int br_fill_ifinfo(struct sk_buff *skb,
 
 		if (filter_mask & RTEXT_FILTER_CFM_STATUS) {
 			rcu_read_lock();
-			err = br_cfm_status_fill_info(skb, br);
+			err = br_cfm_status_fill_info(skb, br, getlink);
 			rcu_read_unlock();
 			if (err)
 				goto nla_put_failure;
@@ -519,11 +565,9 @@ static int br_fill_ifinfo(struct sk_buff *skb,
 	return -EMSGSIZE;
 }
 
-/* Notify listeners of a change in bridge or port information */
-void br_ifinfo_notify(int event, const struct net_bridge *br,
-		      const struct net_bridge_port *port)
+void br_info_notify(int event, const struct net_bridge *br,
+		    const struct net_bridge_port *port, u32 filter)
 {
-	u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
 	struct net_device *dev;
 	struct sk_buff *skb;
 	int err = -ENOBUFS;
@@ -548,7 +592,7 @@ void br_ifinfo_notify(int event, const struct net_bridge
*br,
 	if (skb == NULL)
 		goto errout;
 
-	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, dev);
+	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, dev, false);
 	if (err < 0) {
 		/* -EMSGSIZE implies BUG in br_nlmsg_size() */
 		WARN_ON(err == -EMSGSIZE);
@@ -561,6 +605,15 @@ void br_ifinfo_notify(int event, const struct net_bridge
*br,
 	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 }
 
+/* Notify listeners of a change in bridge or port information */
+void br_ifinfo_notify(int event, const struct net_bridge *br,
+		      const struct net_bridge_port *port)
+{
+	u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
+
+	return br_info_notify(event, br, port, filter);
+}
+
 /*
  * Dump information about all ports, in response to GETLINK
  */
@@ -577,7 +630,7 @@ int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 		return 0;
 
 	return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
-			      filter_mask, dev);
+			      filter_mask, dev, true);
 }
 
 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 228635b350a2..905d406a2fc7 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1466,7 +1466,11 @@ int br_cfm_parse(struct net_bridge *br, struct
net_bridge_port *p,
 bool br_cfm_created(struct net_bridge *br);
 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *p);
 int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br);
-int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br);
+int br_cfm_status_fill_info(struct sk_buff *skb,
+			    struct net_bridge *br,
+			    bool getlink);
+int br_cfm_mep_count(struct net_bridge *br, u32 *count);
+int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count);
 #else
 static inline int br_cfm_parse(struct net_bridge *br, struct net_bridge_port
*p,
 			       struct nlattr *attr, int cmd,
@@ -1490,7 +1494,19 @@ static inline int br_cfm_config_fill_info(struct sk_buff
*skb, struct net_bridge
 	return -EOPNOTSUPP;
 }
 
-static inline int br_cfm_status_fill_info(struct sk_buff *skb, struct
net_bridge *br)
+static inline int br_cfm_status_fill_info(struct sk_buff *skb,
+					  struct net_bridge *br,
+					  bool getlink)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int br_cfm_mep_count(struct net_bridge *br, u32 *count)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count)
 {
 	return -EOPNOTSUPP;
 }
@@ -1502,6 +1518,8 @@ int br_netlink_init(void);
 void br_netlink_fini(void);
 void br_ifinfo_notify(int event, const struct net_bridge *br,
 		      const struct net_bridge_port *port);
+void br_info_notify(int event, const struct net_bridge *br,
+		    const struct net_bridge_port *port, u32 filter);
 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
 	       struct netlink_ext_ack *extack);
 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
-- 
2.28.0

Jakub Kicinski

2020-Oct-14 22:58 UTC

head link

[Bridge] [PATCH net-next v5 00/10] net: bridge: cfm: Add support for Connectivity Fault Management(CFM)

On Mon, 12 Oct 2020 14:04:18 +0000 Henrik Bjoernlund
wrote:> Connectivity Fault Management (CFM) is defined in 802.1Q section 12.14.
> 
> Connectivity Fault Management (CFM) comprises capabilities for detecting,
verifying,
> and isolating connectivity failures in Virtual Bridged Networks.
> These capabilities can be used in networks operated by multiple independent
organizations,
> each with restricted management access to each other?s equipment.
Please wrap the cover letter and commit messages to 70 chars.
> Reviewed-by: Horatiu Vultur  <horatiu.vultur at microchip.com>
> Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund at
microchip.com>
You have two spaces after the name in many tags.

Linux Ethernet Bridging - Oct 2020 - [Bridge] [PATCH net-next v5 00/10] net: bridge: cfm: Add support for Connectivity Fault Management(CFM)

[Bridge] [PATCH net-next v5 00/10] net: bridge: cfm: Add support for Connectivity Fault Management(CFM)

[Bridge] [PATCH net-next v5 01/10] net: bridge: extend the process of special frames

[Bridge] [PATCH net-next v5 02/10] bridge: cfm: Add BRIDGE_CFM to Kconfig.

[Bridge] [PATCH net-next v5 03/10] bridge: uapi: cfm: Added EtherType used by the CFM protocol.

[Bridge] [PATCH net-next v5 04/10] bridge: cfm: Kernel space implementation of CFM. MEP create/delete.

[Bridge] [PATCH net-next v5 05/10] bridge: cfm: Kernel space implementation of CFM. CCM frame TX added.

[Bridge] [PATCH net-next v5 06/10] bridge: cfm: Kernel space implementation of CFM. CCM frame RX added.

[Bridge] [PATCH net-next v5 07/10] bridge: cfm: Netlink SET configuration Interface.

[Bridge] [PATCH net-next v5 08/10] bridge: cfm: Netlink GET configuration Interface.

[Bridge] [PATCH net-next v5 09/10] bridge: cfm: Netlink GET status Interface.

[Bridge] [PATCH net-next v5 10/10] bridge: cfm: Netlink Notifications.

[Bridge] [PATCH net-next v5 00/10] net: bridge: cfm: Add support for Connectivity Fault Management(CFM)