[Credo][Ycable] fix incorrect uart statistics (#296)

Description
The original get_uart_stat() will only report the last record of the uart statistic due to all record shared the same object instance.

Motivation and Context
How Has This Been Tested?

Signed-off-by: xinyu <[email protected]>

Author: xinyulin

sonic_y_cable/credo/y_cable_credo.py

@@ -3153,8 +3153,7 @@ def get_uart_stat(self):
         """
 
         if self.platform_chassis is not None:
-            cnt = {}
-            uartPort = {}
+            
             result = {}
 
             for option in range(2):
@@ -3166,27 +3165,41 @@ def get_uart_stat(self):
                     self.log_error('Dump Uart statstics error (error code:0x%04X)' % (status))
                     return result
 
-                addr = 128
-
-                for idx in range(1, 3):
-                    cnt['TxPktCnt']   = (self.read_mmap(YCable.MIS_PAGE_FC, addr + 3) << 24) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 2) << 16) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 1) << 8) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 0) << 0)
-                    addr += 4
-                    cnt['RxPktCnt']   = (self.read_mmap(YCable.MIS_PAGE_FC, addr + 3) << 24) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 2) << 16) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 1) << 8) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 0) << 0)
-                    addr += 4
-                    cnt['AckCnt']     = (self.read_mmap(YCable.MIS_PAGE_FC, addr + 3) << 24) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 2) << 16) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 1) << 8) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 0) << 0)
-                    addr += 4
-                    cnt['NackCnt']    = (self.read_mmap(YCable.MIS_PAGE_FC, addr + 3) << 24) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 2) << 16) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 1) << 8) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 0) << 0)
-                    addr += 4
-                    cnt['TxRetryCnt'] = (self.read_mmap(YCable.MIS_PAGE_FC, addr + 3) << 24) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 2) << 16) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 1) << 8) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 0) << 0)
-                    addr += 4
-                    cnt['TxAbortCnt'] = (self.read_mmap(YCable.MIS_PAGE_FC, addr + 3) << 24) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 2) << 16) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 1) << 8) | (self.read_mmap(YCable.MIS_PAGE_FC, addr + 0) << 0)
-                    addr += 4
-                    uartPort['UART%d' % idx] = cnt
+                data = self.read_mmap(YCable.MIS_PAGE_FC, 128, 64)
+                ver  = self.read_mmap(YCable.MIS_PAGE_VSC, 130, 1)
+
+                uartPort = {}
+                cnt = {}
+                cnt['TxPktCnt']   = struct.unpack_from('<I', data[  0 :  4])[0] 
+                cnt['RxPktCnt']   = struct.unpack_from('<I', data[  4 :  8])[0] 
+                cnt['AckCnt']     = struct.unpack_from('<I', data[  8 : 12])[0] 
+                cnt['NackCnt']    = struct.unpack_from('<I', data[ 12 : 16])[0] 
+                cnt['TxRetryCnt'] = struct.unpack_from('<I', data[ 16 : 20])[0] 
+                cnt['TxAbortCnt'] = struct.unpack_from('<I', data[ 20 : 24])[0]
+
+                if ver == 1:
+                    cnt['RxErrorCnt'] = struct.unpack_from('<I', data[ 48 : 52])[0]
+
+                uartPort['UART1'] = cnt
+
+                cnt = {}
+                cnt['TxPktCnt']   = struct.unpack_from('<I', data[ 24 : 28])[0] 
+                cnt['RxPktCnt']   = struct.unpack_from('<I', data[ 28 : 32])[0] 
+                cnt['AckCnt']     = struct.unpack_from('<I', data[ 32 : 36])[0] 
+                cnt['NackCnt']    = struct.unpack_from('<I', data[ 36 : 40])[0] 
+                cnt['TxRetryCnt'] = struct.unpack_from('<I', data[ 40 : 44])[0] 
+                cnt['TxAbortCnt'] = struct.unpack_from('<I', data[ 44 : 48])[0] 
+
+                if ver == 1:
+                    cnt['RxErrorCnt'] = struct.unpack_from('<I', data[ 52 : 56])[0]
+
+                uartPort['UART2'] = cnt
+
                 if option == 0: result['Local']  = uartPort
                 else:           result['Remote'] = uartPort
 
         else:
-            self.log_error("platform_chassis is not loaded, failed to get Uart statstics")
+            self.log_error("platform_chassis is not loaded, failed to get Uart statistics")
 
         return result