net: hsr: Provide RedBox support (HSR-SAN)

Introduce RedBox support (HSR-SAN to be more precise) for HSR networks.
Following traffic reduction optimizations have been implemented:
- Do not send HSR supervisory frames to Port C (interlink)
- Do not forward to HSR ring frames addressed to Port C
- Do not forward to Port C frames from HSR ring
- Do not send duplicate HSR frame to HSR ring when destination is Port C

The corresponding patch to modify iptable2 sources has already been sent:
https://lore.kernel.org/netdev/20240308145729.490863-1-lukma@denx.de/T/

Testing procedure (veth and netns):
-----------------------------------
One shall run:
linux-vanila/tools/testing/selftests/net/hsr/hsr_redbox.sh
(Detailed description of the setup one can find in the test
script file).

Testing procedure (real hardware):
----------------------------------
The EVB-KSZ9477 has been used for testing on net-next branch
(SHA1: 5fc68320c1fb3c7d456ddcae0b4757326a043e6f).

Ports 4/5 were used for SW managed HSR (hsr1) as first hsr0 for ports 1/2
(with HW offloading for ksz9477) was created. Port 3 has been used as
interlink port (single USB-ETH dongle).

Configuration - RedBox (EVB-KSZ9477):
if link set lan1 down;ip link set lan2 down
ip link add name hsr0 type hsr slave1 lan1 slave2 lan2 supervision 45 version 1
ip link add name hsr1 type hsr slave1 lan4 slave2 lan5 interlink lan3 supervision 45 version 1
ip link set lan4 up;ip link set lan5 up
ip link set lan3 up
ip addr add 192.168.0.11/24 dev hsr1
ip link set hsr1 up

Configuration - DAN-H (EVB-KSZ9477):

ip link set lan1 down;ip link set lan2 down
ip link add name hsr0 type hsr slave1 lan1 slave2 lan2 supervision 45 version 1
ip link add name hsr1 type hsr slave1 lan4 slave2 lan5 supervision 45 version 1
ip link set lan4 up;ip link set lan5 up
ip addr add 192.168.0.12/24 dev hsr1
ip link set hsr1 up

This approach uses only SW based HSR devices (hsr1).

--------------          -----------------       ------------
DAN-H  Port5 | <------> | Port5         |       |
       Port4 | <------> | Port4   Port3 | <---> | PC
             |          | (RedBox)      |       | (USB-ETH)
EVB-KSZ9477  |          | EVB-KSZ9477   |       |
--------------          -----------------       ------------

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 18e01791ad79..23850b16d1ea 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -21,6 +21,7 @@
  */
 #define HSR_LIFE_CHECK_INTERVAL		 2000 /* ms */
 #define HSR_NODE_FORGET_TIME		60000 /* ms */
+#define HSR_PROXY_NODE_FORGET_TIME	60000 /* ms */
 #define HSR_ANNOUNCE_INTERVAL		  100 /* ms */
 #define HSR_ENTRY_FORGET_TIME		  400 /* ms */
 
@@ -35,6 +36,7 @@
  * HSR_NODE_FORGET_TIME?
  */
 #define PRUNE_PERIOD			 3000 /* ms */
+#define PRUNE_PROXY_PERIOD		 3000 /* ms */
 #define HSR_TLV_EOT				   0  /* End of TLVs */
 #define HSR_TLV_ANNOUNCE		   22
 #define HSR_TLV_LIFE_CHECK		   23
@@ -192,11 +194,14 @@ struct hsr_priv {
 	struct rcu_head		rcu_head;
 	struct list_head	ports;
 	struct list_head	node_db;	/* Known HSR nodes */
+	struct list_head	proxy_node_db;	/* RedBox HSR proxy nodes */
 	struct hsr_self_node	__rcu *self_node;	/* MACs of slaves */
 	struct timer_list	announce_timer;	/* Supervision frame dispatch */
 	struct timer_list	prune_timer;
+	struct timer_list	prune_proxy_timer;
 	int announce_count;
 	u16 sequence_nr;
+	u16 interlink_sequence_nr; /* Interlink port seq_nr */
 	u16 sup_sequence_nr;	/* For HSRv1 separate seq_nr for supervision */
 	enum hsr_version prot_version;	/* Indicate if HSRv0, HSRv1 or PRPv1 */
 	spinlock_t seqnr_lock;	/* locking for sequence_nr */
@@ -209,6 +214,8 @@ struct hsr_priv {
 				 * of lan_id
 				 */
 	bool fwd_offloaded;	/* Forwarding offloaded to HW */
+	bool redbox;            /* Device supports HSR RedBox */
+	unsigned char		macaddress_redbox[ETH_ALEN];
 	unsigned char		sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16));
 				/* Align to u16 boundary to avoid unaligned access
 				 * in ether_addr_equal