net: ldpaa_eth: extend debug capabilities with DPMAC statistics

The ldpaa_eth driver already had a DPMAC statistics dump, this patch
extends the list of stats and adds a bit more structure to the code.

For a bit more context, the DPAA2 u-boot software architecture uses a
default network interface object - a DPNI - which, at runtime, will get
connected to the currently used DPMAC object.
Each time the .stop() eth callback is called, the DPMAC is destroyed
thus any previous counters will get lost.

As a preparation for the next patches, we add a software kept set of
DPMAC counters which will get updated before each destroy operation
takes place.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/include/fsl-mc/fsl_dpmac.h b/include/fsl-mc/fsl_dpmac.h
index 8f5e17f..1fa26ef 100644
--- a/include/fsl-mc/fsl_dpmac.h
+++ b/include/fsl-mc/fsl_dpmac.h
@@ -412,6 +412,8 @@
  * @DPMAC_CNT_EGR_ERR_FRAME: counts frame transmitted with an error
  * @DPMAC_CNT_ING_GOOD_FRAME: counts frame received without error, including
  *			      pause frames.
+ * @DPMAC_CNT_EGR_GOOD_FRAME: counts frames transmitted without error, including
+ *			      pause frames.
  */
 enum dpmac_counter {
 	DPMAC_CNT_ING_FRAME_64,
@@ -440,7 +442,8 @@
 	DPMAC_CNT_EGR_BCAST_FRAME,
 	DPMAC_CNT_EGR_UCAST_FRAME,
 	DPMAC_CNT_EGR_ERR_FRAME,
-	DPMAC_CNT_ING_GOOD_FRAME
+	DPMAC_CNT_ING_GOOD_FRAME,
+	DPMAC_CNT_EGR_GOOD_FRAME,
 };
 
 /**