[SCSI] qla2xxx: Honour "Extended BB credits" bit for CNAs.

We now enable/disable "Additional Receive Credits" in f/w based on nvram
parameter "Extended_BB_Credits" bit (i.e. Enhanced-Features: at offset 0x196).
This is applicable only for GEN2 CNAs.

Signed-off-by: Santosh Vernekar <santosh.vernekar@qlogic.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 22 insertions, 4 deletions

diff --git a/drivers/scsi/qla2xxx/qla_fw.h b/drivers/scsi/qla2xxx/qla_fw.h
index cebf4f1bb7d9..42c5587cc50c 100644
--- a/drivers/scsi/qla2xxx/qla_fw.h
+++ b/drivers/scsi/qla2xxx/qla_fw.h
@@ -1592,10 +1592,22 @@ struct nvram_81xx {
 
         /* Offset 384. */
         uint8_t reserved_21[16];
-        uint16_t reserved_22[8];
+        uint16_t reserved_22[3];
+
+        /*
+         * BIT 0 = Extended BB credits for LR
+         * BIT 1 = Virtual Fabric Enable
+         * BIT 2 = Enhanced Features Unused
+         * BIT 3-7 = Enhanced Features Reserved
+         */
+        /* Enhanced Features */
+        uint8_t enhanced_features;
+
+        uint8_t reserved_23;
+        uint16_t reserved_24[4];
 
         /* Offset 416. */
-        uint16_t reserved_23[32];
+        uint16_t reserved_25[32];
 
         /* Offset 480. */
         uint8_t model_name[16];
@@ -1603,7 +1615,7 @@ struct nvram_81xx {
         /* Offset 496. */
         uint16_t feature_mask_l;
         uint16_t feature_mask_h;
-        uint16_t reserved_24[2];
+        uint16_t reserved_26[2];
 
         uint16_t subsystem_vendor_id;
         uint16_t subsystem_device_id;
diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index 6e53bdbb1da8..3ba9a2b56556 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -339,6 +339,7 @@ qla2x00_load_ram(scsi_qla_host_t *vha, dma_addr_t req_dma, uint32_t risc_addr,
         return rval;
 }
 
+#define EXTENDED_BB_CREDITS     BIT_0
 /*
  * qla2x00_execute_fw
  *     Start adapter firmware.
@@ -371,7 +372,12 @@ qla2x00_execute_fw(scsi_qla_host_t *vha, uint32_t risc_addr)
                 mcp->mb[1] = MSW(risc_addr);
                 mcp->mb[2] = LSW(risc_addr);
                 mcp->mb[3] = 0;
-                mcp->mb[4] = 0;
+                if (IS_QLA81XX(ha)) {
+                        struct nvram_81xx *nv = ha->nvram;
+                        mcp->mb[4] = (nv->enhanced_features &
+                            EXTENDED_BB_CREDITS);
+                } else
+                        mcp->mb[4] = 0;
                 mcp->out_mb |= MBX_4|MBX_3|MBX_2|MBX_1;
                 mcp->in_mb |= MBX_1;
         } else {