be2iscsi: Cleanup processing of BMBX completion

Remove confusingly named be_mcc_compl_is_new and be_mcc_compl_use
functions in processing of BMBX. Rearrange beiscsi_process_mbox_compl
function.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/be2iscsi/be_cmds.c b/drivers/scsi/be2iscsi/be_cmds.c
index 60db2de..728aa13 100644 (file)
--- a/drivers/scsi/be2iscsi/be_cmds.c
+++ b/drivers/scsi/be2iscsi/be_cmds.c
@@ -263,21 +263,6 @@ int beiscsi_mccq_compl_wait(struct beiscsi_hba *phba,
        return rc;
 }
 
-static inline bool be_mcc_compl_is_new(struct be_mcc_compl *compl)
-{
-       if (compl->flags != 0) {
-               compl->flags = le32_to_cpu(compl->flags);
-               WARN_ON((compl->flags & CQE_FLAGS_VALID_MASK) == 0);
-               return true;
-       } else
-               return false;
-}
-
-static inline void be_mcc_compl_use(struct be_mcc_compl *compl)
-{
-       compl->flags = 0;
-}
-
 /*
  * beiscsi_process_mbox_compl()- Check the MBX completion status
  * @ctrl: Function specific MBX data structure
@@ -298,30 +283,46 @@ static int beiscsi_process_mbox_compl(struct be_ctrl_info *ctrl,
        struct be_cmd_req_hdr *hdr = embedded_payload(wrb);
        struct be_cmd_resp_hdr *resp_hdr;
 
-       be_dws_le_to_cpu(compl, 4);
+       /**
+        * To check if valid bit is set, check the entire word as we don't know
+        * the endianness of the data (old entry is host endian while a new
+        * entry is little endian)
+        */
+       if (!compl->flags) {
+               beiscsi_log(phba, KERN_ERR,
+                               BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
+                               "BC_%d : BMBX busy, no completion\n");
+               return -EBUSY;
+       }
+       compl->flags = le32_to_cpu(compl->flags);
+       WARN_ON((compl->flags & CQE_FLAGS_VALID_MASK) == 0);
 
+       /**
+        * Just swap the status to host endian;
+        * mcc tag is opaquely copied from mcc_wrb.
+        */
+       be_dws_le_to_cpu(compl, 4);
        compl_status = (compl->status >> CQE_STATUS_COMPL_SHIFT) &
-                                       CQE_STATUS_COMPL_MASK;
-       if (compl_status != MCC_STATUS_SUCCESS) {
-               extd_status = (compl->status >> CQE_STATUS_EXTD_SHIFT) &
-                                               CQE_STATUS_EXTD_MASK;
+               CQE_STATUS_COMPL_MASK;
+       extd_status = (compl->status >> CQE_STATUS_EXTD_SHIFT) &
+               CQE_STATUS_EXTD_MASK;
+       /* Need to reset the entire word that houses the valid bit */
+       compl->flags = 0;
 
-               beiscsi_log(phba, KERN_ERR,
-                           BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
-                           "BC_%d : error in cmd completion: "
-                           "Subsystem : %d Opcode : %d "
-                           "status(compl/extd)=%d/%d\n",
-                           hdr->subsystem, hdr->opcode,
-                           compl_status, extd_status);
-
-               if (compl_status == MCC_STATUS_INSUFFICIENT_BUFFER) {
-                       resp_hdr = (struct be_cmd_resp_hdr *) hdr;
-                       if (resp_hdr->response_length)
-                               return 0;
-               }
-               return -EINVAL;
+       if (compl_status == MCC_STATUS_SUCCESS)
+               return 0;
+
+       beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
+                   "BC_%d : error in cmd completion: Subsystem : %d Opcode : %d status(compl/extd)=%d/%d\n",
+                   hdr->subsystem, hdr->opcode, compl_status, extd_status);
+
+       if (compl_status == MCC_STATUS_INSUFFICIENT_BUFFER) {
+               /* if status is insufficient buffer, check the length */
+               resp_hdr = (struct be_cmd_resp_hdr *) hdr;
+               if (resp_hdr->response_length)
+                       return 0;
        }
-       return 0;
+       return -EINVAL;
 }
 
 static void beiscsi_process_async_link(struct beiscsi_hba *phba,
@@ -453,10 +454,6 @@ int beiscsi_process_mcc_compl(struct be_ctrl_info *ctrl,
        struct be_dma_mem *tag_mem;
        unsigned int tag, wrb_idx;
 
-       /**
-        * Just swap the status to host endian; mcc tag is opaquely copied
-        * from mcc_wrb
-        */
        be_dws_le_to_cpu(compl, 4);
        tag = (compl->tag0 & MCC_Q_CMD_TAG_MASK);
        wrb_idx = (compl->tag0 & CQE_STATUS_WRB_MASK) >> CQE_STATUS_WRB_SHIFT;