[fix] Use the same storm detection condition for queue occupancy non-zero case as the zero case (sonic-net#1111)

* Check if pfc is at on state over the polling period for queue occupany non-zero case

Signed-off-by: Wenda Ni <[email protected]>

* Use the same condition for queue occupany zero and non-zero cases

Signed-off-by: Wenda Ni <[email protected]>

* Remove single line comments that no longer valid

Author: wendani

orchagent/pfc_detect_broadcom.lua

@@ -67,11 +67,8 @@ for i = n, 1, -1 do
                     pfc_on2off_last = tonumber(pfc_on2off_last)
 
                     -- Check actual condition of queue being in PFC storm
-                    if (occupancy_bytes > 0 and packets - packets_last == 0 and pfc_rx_packets - pfc_rx_packets_last > 0) or
-                        -- DEBUG CODE START. Uncomment to enable
-                        (debug_storm == "enabled") or
-                        -- DEBUG CODE END.
-                        (occupancy_bytes == 0 and pfc_rx_packets - pfc_rx_packets_last > 0 and pfc_on2off - pfc_on2off_last == 0 and queue_pause_status_last == 'true' and queue_pause_status == 'true') then
+                    if (pfc_rx_packets - pfc_rx_packets_last > 0 and pfc_on2off - pfc_on2off_last == 0 and queue_pause_status_last == 'true' and queue_pause_status == 'true') or
+                        (debug_storm == "enabled") then
                         if time_left <= poll_time then
                             redis.call('PUBLISH', 'PFC_WD_ACTION', '["' .. KEYS[i] .. '","storm"]')
                             is_deadlock = true