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@microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur@microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/net/bridge/br_private_cfm.h b/net/bridge/br_private_cfm.h
index 8d1b449acfbf..a43a5e7fa2c3 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 */
+	u8 ccm_defect:1;
+
+	/* (RDI == 1) for last received CCM PDU */
+	u8 rdi:1;
+
+	/* Indications that a CCM PDU has been seen. */
+	u8 seen:1; /* CCM PDU received */
+	u8 tlv_seen:1; /* CCM PDU with TLV received */
+	/* CCM PDU with unexpected sequence number received */
+	u8 seq_unexp_seen:1;
+};
+
 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;
 };