[arbel] Synchronise changes with the Hermon driver

Backport some changes from the Hermon driver to the Arbel driver.
Specifically:

 o  Rename reserved_lkey to lkey

 o  Add arbel_rate() to calculate transmission rates

 o  Structure code to allow for addition of RC queue pairs

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/infiniband/arbel.h

@@ -107,6 +107,10 @@ FILE_LICENCE ( GPL2_OR_LATER );
 
 #define ARBEL_LOG_MULTICAST_HASH_SIZE	3
 
+#define ARBEL_PM_STATE_ARMED		0x00
+#define ARBEL_PM_STATE_REARM		0x01
+#define ARBEL_PM_STATE_MIGRATED		0x03
+
 /*
  * Datatypes that seem to be missing from the autogenerated documentation
  *
@@ -469,11 +473,11 @@ struct arbel {
 	struct arbel_event_queue eq;
 	/** Doorbell records */
 	union arbelprm_doorbell_record *db_rec;
-	/** Reserved LKey
+	/** Unrestricted LKey
 	 *
 	 * Used to get unrestricted memory access.
 	 */
-	unsigned long reserved_lkey;
+	unsigned long lkey;
 
 	/** Completion queue in-use bitmask */
 	arbel_bitmask_t cq_inuse[ ARBEL_BITMASK_SIZE ( ARBEL_MAX_CQS ) ];