bnxt_en: Handle RESET_NOTIFY async event from firmware.

This event from firmware signals a coordinated reset initiated by the
firmware.  It may be triggered by some error conditions encountered
in the firmware or other orderly reset conditions.

We store the parameters from this event.  Subsequent patches will
add logic to handle reset itself using devlink reporters.

Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -254,6 +254,7 @@ static const u16 bnxt_async_events_arr[] = {
 	ASYNC_EVENT_CMPL_EVENT_ID_PORT_CONN_NOT_ALLOWED,
 	ASYNC_EVENT_CMPL_EVENT_ID_VF_CFG_CHANGE,
 	ASYNC_EVENT_CMPL_EVENT_ID_LINK_SPEED_CFG_CHANGE,
+	ASYNC_EVENT_CMPL_EVENT_ID_RESET_NOTIFY,
 	ASYNC_EVENT_CMPL_EVENT_ID_ERROR_RECOVERY,
 };
 
@@ -1979,6 +1980,16 @@ static int bnxt_async_event_process(struct bnxt *bp,
 			goto async_event_process_exit;
 		set_bit(BNXT_RESET_TASK_SILENT_SP_EVENT, &bp->sp_event);
 		break;
+	case ASYNC_EVENT_CMPL_EVENT_ID_RESET_NOTIFY:
+		bp->fw_reset_timestamp = jiffies;
+		bp->fw_reset_min_dsecs = cmpl->timestamp_lo;
+		if (!bp->fw_reset_min_dsecs)
+			bp->fw_reset_min_dsecs = BNXT_DFLT_FW_RST_MIN_DSECS;
+		bp->fw_reset_max_dsecs = le16_to_cpu(cmpl->timestamp_hi);
+		if (!bp->fw_reset_max_dsecs)
+			bp->fw_reset_max_dsecs = BNXT_DFLT_FW_RST_MAX_DSECS;
+		set_bit(BNXT_FW_RESET_NOTIFY_SP_EVENT, &bp->sp_event);
+		break;
 	case ASYNC_EVENT_CMPL_EVENT_ID_ERROR_RECOVERY: {
 		struct bnxt_fw_health *fw_health = bp->fw_health;
 		u32 data1 = le32_to_cpu(cmpl->event_data1);

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1719,6 +1719,13 @@ struct bnxt {
 #define BNXT_FLOW_STATS_SP_EVENT	15
 #define BNXT_UPDATE_PHY_SP_EVENT	16
 #define BNXT_RING_COAL_NOW_SP_EVENT	17
+#define BNXT_FW_RESET_NOTIFY_SP_EVENT	18
+
+	u16			fw_reset_min_dsecs;
+#define BNXT_DFLT_FW_RST_MIN_DSECS	20
+	u16			fw_reset_max_dsecs;
+#define BNXT_DFLT_FW_RST_MAX_DSECS	60
+	unsigned long		fw_reset_timestamp;
 
 	struct bnxt_fw_health	*fw_health;