net: dsa: microchip: Enable HSR offloading for KSZ9477

This patch adds functions for providing in KSZ9477 switch HSR
(High-availability Seamless Redundancy) hardware offloading.

According to AN3474 application note following features are provided:
- TX packet duplication from host to switch (NETIF_F_HW_HSR_DUP)
- RX packet duplication discarding
- Prevention of packet loop

For last two ones - there is a probability that some packets will not
be filtered in HW (in some special cases - described in AN3474).
Hence, the HSR core code shall be used to discard those not caught frames.

Moreover, some switch registers adjustments are required - like setting
MAC address of HSR network interface.

Additionally, the KSZ9477 switch has been configured to forward frames
between HSR ports (e.g. 1,2) members to provide support for
NETIF_F_HW_HSR_FWD flag.

Join and leave functions are written in a way, that are executed with
single port - i.e. configuration is NOT done only when second HSR port
is configured.

Co-developed-by: Vladimir Oltean <[email protected]>
Signed-off-by: Vladimir Oltean <[email protected]>
Signed-off-by: Lukasz Majewski <[email protected]>
Reviewed-by: Vladimir Oltean <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 07c7723dbc37..8842efca0871 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -101,6 +101,11 @@ struct ksz_ptp_irq {
 	int num;
 };
 
+struct ksz_switch_macaddr {
+	unsigned char addr[ETH_ALEN];
+	refcount_t refcount;
+};
+
 struct ksz_port {
 	bool remove_tag;		/* Remove Tag flag set, for ksz8795 only */
 	bool learning;
@@ -170,6 +175,10 @@ struct ksz_device {
 	struct mutex lock_irq;		/* IRQ Access */
 	struct ksz_irq girq;
 	struct ksz_ptp_data ptp_data;
+
+	struct ksz_switch_macaddr *switch_macaddr;
+	struct net_device *hsr_dev;     /* HSR */
+	u8 hsr_ports;
 };
 
 /* List of supported models */