drivers/net/vsc9953: Add command to show/clear port counters

The new added command:
ethsw [port <port_no>] statistics { [help] | [clear] }

will print counters like the number of Rx/Tx frames,
number of Rx/Tx bytes, number of Rx/Tx unicast frames, etc.
This patch also adds this commnd in the genereric ethsw
parser from cmd_ethsw.c

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@freescale.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <yorksun@freescale.com>

include/vsc9953.h

@@ -77,6 +77,11 @@
 /* Macros for vsc9953_sys_pause_cfgtot_tail_drop_lvl register */
 #define VSC9953_TOT_TAIL_DROP_LVL	0x000003ff
 
+/* Macros for vsc9953_sys_sys.stat_cfg register */
+#define VSC9953_STAT_CLEAR_RX		0x00000400
+#define VSC9953_STAT_CLEAR_TX		0x00000800
+#define VSC9953_STAT_CLEAR_DR		0x00001000
+
 /* Macros for vsc9953_vcap_core_cfg.vcap_mv_cfg register */
 #define VSC9953_VCAP_MV_CFG		0x0000ffff
 #define VSC9953_VCAP_UPDATE_CTRL	0x01000004
@@ -332,10 +337,115 @@ struct vsc9953_qsys_reg {
 
 /* VSC9953 SYS structure */
 
+struct vsc9953_rx_cntrs {
+	u32	c_rx_oct;
+	u32	c_rx_uc;
+	u32	c_rx_mc;
+	u32	c_rx_bc;
+	u32	c_rx_short;
+	u32	c_rx_frag;
+	u32	c_rx_jabber;
+	u32	c_rx_crc;
+	u32	c_rx_symbol_err;
+	u32	c_rx_sz_64;
+	u32	c_rx_sz_65_127;
+	u32	c_rx_sz_128_255;
+	u32	c_rx_sz_256_511;
+	u32	c_rx_sz_512_1023;
+	u32	c_rx_sz_1024_1526;
+	u32	c_rx_sz_jumbo;
+	u32	c_rx_pause;
+	u32	c_rx_control;
+	u32	c_rx_long;
+	u32	c_rx_cat_drop;
+	u32	c_rx_red_prio_0;
+	u32	c_rx_red_prio_1;
+	u32	c_rx_red_prio_2;
+	u32	c_rx_red_prio_3;
+	u32	c_rx_red_prio_4;
+	u32	c_rx_red_prio_5;
+	u32	c_rx_red_prio_6;
+	u32	c_rx_red_prio_7;
+	u32	c_rx_yellow_prio_0;
+	u32	c_rx_yellow_prio_1;
+	u32	c_rx_yellow_prio_2;
+	u32	c_rx_yellow_prio_3;
+	u32	c_rx_yellow_prio_4;
+	u32	c_rx_yellow_prio_5;
+	u32	c_rx_yellow_prio_6;
+	u32	c_rx_yellow_prio_7;
+	u32	c_rx_green_prio_0;
+	u32	c_rx_green_prio_1;
+	u32	c_rx_green_prio_2;
+	u32	c_rx_green_prio_3;
+	u32	c_rx_green_prio_4;
+	u32	c_rx_green_prio_5;
+	u32	c_rx_green_prio_6;
+	u32	c_rx_green_prio_7;
+	u32	reserved[20];
+};
+
+struct vsc9953_tx_cntrs {
+	u32	c_tx_oct;
+	u32	c_tx_uc;
+	u32	c_tx_mc;
+	u32	c_tx_bc;
+	u32	c_tx_col;
+	u32	c_tx_drop;
+	u32	c_tx_pause;
+	u32	c_tx_sz_64;
+	u32	c_tx_sz_65_127;
+	u32	c_tx_sz_128_255;
+	u32	c_tx_sz_256_511;
+	u32	c_tx_sz_512_1023;
+	u32	c_tx_sz_1024_1526;
+	u32	c_tx_sz_jumbo;
+	u32	c_tx_yellow_prio_0;
+	u32	c_tx_yellow_prio_1;
+	u32	c_tx_yellow_prio_2;
+	u32	c_tx_yellow_prio_3;
+	u32	c_tx_yellow_prio_4;
+	u32	c_tx_yellow_prio_5;
+	u32	c_tx_yellow_prio_6;
+	u32	c_tx_yellow_prio_7;
+	u32	c_tx_green_prio_0;
+	u32	c_tx_green_prio_1;
+	u32	c_tx_green_prio_2;
+	u32	c_tx_green_prio_3;
+	u32	c_tx_green_prio_4;
+	u32	c_tx_green_prio_5;
+	u32	c_tx_green_prio_6;
+	u32	c_tx_green_prio_7;
+	u32	c_tx_aged;
+	u32	reserved[33];
+};
+
+struct vsc9953_drop_cntrs {
+	u32	c_dr_local;
+	u32	c_dr_tail;
+	u32	c_dr_yellow_prio_0;
+	u32	c_dr_yellow_prio_1;
+	u32	c_dr_yellow_prio_2;
+	u32	c_dr_yellow_prio_3;
+	u32	c_dr_yellow_prio_4;
+	u32	c_dr_yellow_prio_5;
+	u32	c_dr_yellow_prio_6;
+	u32	c_dr_yellow_prio_7;
+	u32	c_dr_green_prio_0;
+	u32	c_dr_green_prio_1;
+	u32	c_dr_green_prio_2;
+	u32	c_dr_green_prio_3;
+	u32	c_dr_green_prio_4;
+	u32	c_dr_green_prio_5;
+	u32	c_dr_green_prio_6;
+	u32	c_dr_green_prio_7;
+	u32	reserved[46];
+};
+
 struct vsc9953_sys_stat {
-	u32	rx_cntrs[64];
-	u32	tx_cntrs[64];
-	u32	drop_cntrs[64];
+	struct vsc9953_rx_cntrs	rx_cntrs;
+	struct vsc9953_tx_cntrs	tx_cntrs;
+	struct vsc9953_drop_cntrs	drop_cntrs;
 	u32	reserved1[6];
 };