be2net: Add MCC queue mechanism for BE cmds

Currenlty all cmds use the blocking MCC mbox to post cmds. An mbox cmd is protected
via a spin_lock(cmd_lock) and not spin_lock_bh() as it is undesirable
to disable BHs while a blocking mbox cmd is in progress (and take long to finish.)
This can lockup a cmd in progress in process context. Instead cmds that may be
called in BH context must use the MCC queue to post cmds. The cmd completions
are rcvd in a separate completion queue and the events are placed in the tx-event
queue.

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/net/benet/be_hw.h b/drivers/net/benet/be_hw.h
index b132aa4893ca..b02e805c1db3 100644
--- a/drivers/net/benet/be_hw.h
+++ b/drivers/net/benet/be_hw.h
@@ -61,7 +61,7 @@
 /* Clear the interrupt for this eq */
 #define DB_EQ_CLR_SHIFT                 (9)     /* bit 9 */
 /* Must be 1 */
-#define DB_EQ_EVNT_SHIFT                        (10)    /* bit 10 */
+#define DB_EQ_EVNT_SHIFT                (10)    /* bit 10 */
 /* Number of event entries processed */
 #define DB_EQ_NUM_POPPED_SHIFT          (16)    /* bits 16 - 28 */
 /* Rearm bit */
@@ -88,6 +88,12 @@
 /* Number of rx frags posted */
 #define DB_RQ_NUM_POSTED_SHIFT          (24)    /* bits 24 - 31 */
 
+/********** MCC door bell ************/
+#define DB_MCCQ_OFFSET                  0x140
+#define DB_MCCQ_RING_ID_MASK            0x7FF   /* bits 0 - 10 */
+/* Number of entries posted */
+#define DB_MCCQ_NUM_POSTED_SHIFT        (16)    /* bits 16 - 29 */
+
 /*
  * BE descriptors: host memory data structures whose formats
  * are hardwired in BE silicon.