net: mhi: Add rx_length_errors stat

This can be used by proto when packet len is incorrect.
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mhi/mhi.h

@@ -9,6 +9,7 @@ struct mhi_net_stats {
 	u64_stats_t rx_bytes;
 	u64_stats_t rx_errors;
 	u64_stats_t rx_dropped;
+	u64_stats_t rx_length_errors;
 	u64_stats_t tx_packets;
 	u64_stats_t tx_bytes;
 	u64_stats_t tx_errors;

drivers/net/mhi/net.c

@@ -95,6 +95,7 @@ static void mhi_ndo_get_stats64(struct net_device *ndev,
 		stats->rx_bytes = u64_stats_read(&mhi_netdev->stats.rx_bytes);
 		stats->rx_errors = u64_stats_read(&mhi_netdev->stats.rx_errors);
 		stats->rx_dropped = u64_stats_read(&mhi_netdev->stats.rx_dropped);
+		stats->rx_length_errors = u64_stats_read(&mhi_netdev->stats.rx_length_errors);
 	} while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.rx_syncp, start));
 
 	do {