NTB: BWD Link Recovery

The BWD NTB device will drop the link if an error is encountered on the
point-to-point PCI bridge.  The link will stay down until all errors are
cleared and the link is re-established.  On link down, check to see if
the error is detected, if so do the necessary housekeeping to try and
recover from the error and reestablish the link.

There is a potential race between the 2 NTB devices recovering at the
same time.  If the times are synchronized, the link will not recover and the
driver will be stuck in this loop forever.  Add a random interval to the
recovery time to prevent this race.

Signed-off-by: Jon Mason <jon.mason@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/ntb/ntb_hw.h b/drivers/ntb/ntb_hw.h
index 72fcb22d7dd..3a15d492593 100644
--- a/drivers/ntb/ntb_hw.h
+++ b/drivers/ntb/ntb_hw.h
@@ -125,10 +125,15 @@ struct ntb_device {
 	unsigned char num_msix;
 	unsigned char bits_per_vector;
 	unsigned char max_cbs;
+	unsigned char link_width;
+	unsigned char link_speed;
 	unsigned char link_status;
+
 	struct delayed_work hb_timer;
 	unsigned long last_ts;
 
+	struct delayed_work lr_timer;
+
 	struct dentry *debugfs_dir;
 };