qed*: Add link change count value to ethtool statistics display.

This patch adds driver changes for capturing the link change count in
ethtool statistics display.

Please consider applying this to "net-next".
Signed-off-by: Sudarsana Reddy Kalluru <Sudarsana.Kalluru@cavium.com>
Signed-off-by: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_l2.c

@@ -1854,6 +1854,11 @@ static void __qed_get_vport_port_stats(struct qed_hwfn *p_hwfn,
 		p_ah->tx_1519_to_max_byte_packets =
 		    port_stats.eth.u1.ah1.t1519_to_max;
 	}
+
+	p_common->link_change_count = qed_rd(p_hwfn, p_ptt,
+					     p_hwfn->mcp_info->port_addr +
+					     offsetof(struct public_port,
+						      link_change_count));
 }
 
 static void __qed_get_vport_stats(struct qed_hwfn *p_hwfn,
@@ -1961,11 +1966,14 @@ void qed_reset_vport_stats(struct qed_dev *cdev)
 
 	/* PORT statistics are not necessarily reset, so we need to
 	 * read and create a baseline for future statistics.
+	 * Link change stat is maintained by MFW, return its value as is.
 	 */
-	if (!cdev->reset_stats)
+	if (!cdev->reset_stats) {
 		DP_INFO(cdev, "Reset stats not allocated\n");
-	else
+	} else {
 		_qed_get_vport_stats(cdev, cdev->reset_stats);
+		cdev->reset_stats->common.link_change_count = 0;
+	}
 }
 
 static enum gft_profile_type

drivers/net/ethernet/qlogic/qede/qede.h

@@ -88,6 +88,7 @@ struct qede_stats_common {
 	u64 coalesced_aborts_num;
 	u64 non_coalesced_pkts;
 	u64 coalesced_bytes;
+	u64 link_change_count;
 
 	/* port */
 	u64 rx_64_byte_packets;

drivers/net/ethernet/qlogic/qede/qede_ethtool.c

@@ -171,6 +171,8 @@ static const struct {
 	QEDE_STAT(coalesced_aborts_num),
 	QEDE_STAT(non_coalesced_pkts),
 	QEDE_STAT(coalesced_bytes),
+
+	QEDE_STAT(link_change_count),
 };
 
 #define QEDE_NUM_STATS	ARRAY_SIZE(qede_stats_arr)

drivers/net/ethernet/qlogic/qede/qede_main.c

@@ -399,6 +399,7 @@ void qede_fill_by_demand_stats(struct qede_dev *edev)
 	p_common->brb_truncates = stats.common.brb_truncates;
 	p_common->brb_discards = stats.common.brb_discards;
 	p_common->tx_mac_ctrl_frames = stats.common.tx_mac_ctrl_frames;
+	p_common->link_change_count = stats.common.link_change_count;
 
 	if (QEDE_IS_BB(edev)) {
 		struct qede_stats_bb *p_bb = &edev->stats.bb;

include/linux/qed/qed_if.h

@@ -1180,6 +1180,7 @@ struct qed_eth_stats_common {
 	u64	tx_mac_mc_packets;
 	u64	tx_mac_bc_packets;
 	u64	tx_mac_ctrl_frames;
+	u64	link_change_count;
 };
 
 struct qed_eth_stats_bb {