[SCSI] be2iscsi: Enable async mode for mcc rings

This patches enables async mode for mcc rings so that
multiple requests can be queued.

Signed-off-by: Jayamohan Kallickal <jayamohank@serverengines.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 13 insertions, 3 deletions

diff --git a/drivers/scsi/be2iscsi/be.h b/drivers/scsi/be2iscsi/be.h
index a93a5040f087..3861cf44dc15 100644
--- a/drivers/scsi/be2iscsi/be.h
+++ b/drivers/scsi/be2iscsi/be.h
@@ -24,6 +24,7 @@
 #define FW_VER_LEN      32
 #define MCC_Q_LEN       128
 #define MCC_CQ_LEN      256
+#define MAX_MCC_CMD     16
 
 struct be_dma_mem {
         void *va;
@@ -57,6 +58,11 @@ static inline void *queue_head_node(struct be_queue_info *q)
         return q->dma_mem.va + q->head * q->entry_size;
 }
 
+static inline void *queue_get_wrb(struct be_queue_info *q, unsigned int wrb_num)
+{
+        return q->dma_mem.va + wrb_num * q->entry_size;
+}
+
 static inline void *queue_tail_node(struct be_queue_info *q)
 {
         return q->dma_mem.va + q->tail * q->entry_size;
@@ -104,15 +110,19 @@ struct be_ctrl_info {
         spinlock_t mcc_lock;    /* For serializing mcc cmds to BE card */
         spinlock_t mcc_cq_lock;
 
-        /* MCC Async callback */
-        void (*async_cb) (void *adapter, bool link_up);
-        void *adapter_ctxt;
+        wait_queue_head_t mcc_wait[MAX_MCC_CMD + 1];
+        unsigned int mcc_tag[MAX_MCC_CMD];
+        unsigned int mcc_numtag[MAX_MCC_CMD + 1];
+        unsigned short mcc_alloc_index;
+        unsigned short mcc_free_index;
+        unsigned int mcc_tag_available;
 };
 
 #include "be_cmds.h"
 
 #define PAGE_SHIFT_4K 12
 #define PAGE_SIZE_4K (1 << PAGE_SHIFT_4K)
+#define mcc_timeout             120000 /* 5s timeout */
 
 /* Returns number of pages spanned by the data starting at the given addr */
 #define PAGES_4K_SPANNED(_address, size)                                \