bnxt_en: Handle async event when the PHC is updated in RTC mode

In Multi-host environment, when the PHC is updated by one host,
an async message from firmware will be sent to other hosts.
Re-initialize the timecounter when the driver receives this
async message.

Cc: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@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

@@ -233,6 +233,7 @@ static const u16 bnxt_async_events_arr[] = {
 	ASYNC_EVENT_CMPL_EVENT_ID_ECHO_REQUEST,
 	ASYNC_EVENT_CMPL_EVENT_ID_PPS_TIMESTAMP,
 	ASYNC_EVENT_CMPL_EVENT_ID_ERROR_REPORT,
+	ASYNC_EVENT_CMPL_EVENT_ID_PHC_UPDATE,
 };
 
 static struct workqueue_struct *bnxt_pf_wq;
@@ -2079,6 +2080,16 @@ static void bnxt_event_error_report(struct bnxt *bp, u32 data1, u32 data2)
 	(BNXT_EVENT_RING_TYPE(data2) ==	\
 	 ASYNC_EVENT_CMPL_RING_MONITOR_MSG_EVENT_DATA2_DISABLE_RING_TYPE_RX)
 
+#define BNXT_EVENT_PHC_EVENT_TYPE(data1)	\
+	(((data1) & ASYNC_EVENT_CMPL_PHC_UPDATE_EVENT_DATA1_FLAGS_MASK) >>\
+	 ASYNC_EVENT_CMPL_PHC_UPDATE_EVENT_DATA1_FLAGS_SFT)
+
+#define BNXT_EVENT_PHC_RTC_UPDATE(data1)	\
+	(((data1) & ASYNC_EVENT_CMPL_PHC_UPDATE_EVENT_DATA1_PHC_TIME_MSB_MASK) >>\
+	 ASYNC_EVENT_CMPL_PHC_UPDATE_EVENT_DATA1_PHC_TIME_MSB_SFT)
+
+#define BNXT_PHC_BITS	48
+
 static int bnxt_async_event_process(struct bnxt *bp,
 				    struct hwrm_async_event_cmpl *cmpl)
 {
@@ -2258,6 +2269,24 @@ static int bnxt_async_event_process(struct bnxt *bp,
 		bnxt_event_error_report(bp, data1, data2);
 		goto async_event_process_exit;
 	}
+	case ASYNC_EVENT_CMPL_EVENT_ID_PHC_UPDATE: {
+		switch (BNXT_EVENT_PHC_EVENT_TYPE(data1)) {
+		case ASYNC_EVENT_CMPL_PHC_UPDATE_EVENT_DATA1_FLAGS_PHC_RTC_UPDATE:
+			if (bp->fw_cap & BNXT_FW_CAP_PTP_RTC) {
+				struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+				u64 ns;
+
+				spin_lock_bh(&ptp->ptp_lock);
+				bnxt_ptp_update_current_time(bp);
+				ns = (((u64)BNXT_EVENT_PHC_RTC_UPDATE(data1) <<
+				       BNXT_PHC_BITS) | ptp->current_time);
+				bnxt_ptp_rtc_timecounter_init(ptp, ns);
+				spin_unlock_bh(&ptp->ptp_lock);
+			}
+			break;
+		}
+		goto async_event_process_exit;
+	}
 	case ASYNC_EVENT_CMPL_EVENT_ID_DEFERRED_RESPONSE: {
 		u16 seq_id = le32_to_cpu(cmpl->event_data2) & 0xffff;