nvethernet: add lane bringup restart callback

Issue: In the current scenrio, when the remote
interface is brought down and up. There is no way
of getting the link up again with the remote device
which in turn fails the data transfers even though
interface from other end is brought up.

Fix: When interface is gone down on the other side,
MAC receives local faults and in this scenario
no data should be sent to MAC, so disable network
queues and initiate the lane bring up process for
monitoring the link status. Once the link is up,
re enable the network queues for data transfers.

Also added support for enabling driver logs using
msglvl of ethtool

Bug 3744088
Bug 3654543
Bug 3665378

Change-Id: I16cdee74e4e3ff6cd176924575f5005f385d4c5d
Signed-off-by: Narayan Reddy <narayanr@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2730876
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Rakesh Goyal <rgoyal@nvidia.com>
Reviewed-by: Bhadram Varka <vbhadram@nvidia.com>
Reviewed-by: Srinivas Ramachandran <srinivasra@nvidia.com>
GVS: Gerrit_Virtual_Submit

drivers/net/ethernet/nvidia/nvethernet/ether_linux.h

@@ -623,6 +623,10 @@ struct ether_priv_data {
 	raw_spinlock_t txts_lock;
 	/** Ref count for ether_get_tx_ts_func */
 	atomic_t tx_ts_ref_cnt;
+	/** Ref count for set_speed_work_func */
+	atomic_t set_speed_ref_cnt;
+	/** flag to enable logs using ethtool */
+	u32 msg_enable;
 };
 
 /**