eth: fbnic: Add initial messaging to notify FW of our presence

After the driver loads we need to get some initial capabilities from the
firmware to determine what the device is capable of and what functionality
needs to be enabled. Specifically we receive information about the current
state of the link and if a BMC is present.

After that when we bring the interface up we will need the ability to take
ownership from the FW. To do that we will need to notify it that we are
taking control before we start configuring the traffic classifier and MAC.

Once we have ownership we need to notify the firmware that we are still
present and active. To do that we will send a regular heartbeat to the FW.
If the FW doesn't receive the heartbeat in a timely fashion it will retake
control of the RPC and MAC and assume that the host has gone offline.

Signed-off-by: Alexander Duyck <[email protected]>
Link: https://patch.msgid.link/172079939458.1778861.8966209942099133957.stgit@ahduyck-xeon-server.home.arpa
Signed-off-by: Jakub Kicinski <[email protected]>

Author: ahduyck

drivers/net/ethernet/meta/fbnic/fbnic.h

@@ -26,9 +26,14 @@ struct fbnic_dev {
 	struct delayed_work service_task;
 
 	struct fbnic_fw_mbx mbx[FBNIC_IPC_MBX_INDICES];
+	struct fbnic_fw_cap fw_cap;
 	/* Lock protecting Tx Mailbox queue to prevent possible races */
 	spinlock_t fw_tx_lock;
 
+	unsigned long last_heartbeat_request;
+	unsigned long last_heartbeat_response;
+	u8 fw_heartbeat_enabled;
+
 	u64 dsn;
 	u32 mps;
 	u32 readrq;

drivers/net/ethernet/meta/fbnic/fbnic_csr.h

@@ -12,6 +12,14 @@
 #define DESC_BIT(nr)		BIT_ULL(nr)
 #define DESC_GENMASK(h, l)	GENMASK_ULL(h, l)
 
+/* Defines the minimum firmware version required by the driver */
+#define MIN_FW_MAJOR_VERSION    0
+#define MIN_FW_MINOR_VERSION    10
+#define MIN_FW_BUILD_VERSION    6
+#define MIN_FW_VERSION_CODE     (MIN_FW_MAJOR_VERSION * (1u << 24) + \
+				 MIN_FW_MINOR_VERSION * (1u << 16) + \
+				 MIN_FW_BUILD_VERSION)
+
 #define PCI_DEVICE_ID_META_FBNIC_ASIC		0x0013
 
 #define FBNIC_CLOCK_FREQ	(600 * (1000 * 1000))