[SCSI] be2iscsi: Adding Ring Mode Wrb's V3

This patch adds support for ring based wrbs

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

3 files changed, 169 insertions, 48 deletions

diff --git a/drivers/scsi/be2iscsi/be_cmds.c b/drivers/scsi/be2iscsi/be_cmds.c
index 10f8fe7a38d2..698a527d6cca 100644
--- a/drivers/scsi/be2iscsi/be_cmds.c
+++ b/drivers/scsi/be2iscsi/be_cmds.c
@@ -125,7 +125,7 @@ static void beiscsi_cq_notify(struct beiscsi_hba *phba, u16 qid, bool arm,
 }
 
 
-int be_process_mcc(struct beiscsi_hba *phba)
+int beiscsi_process_mcc(struct beiscsi_hba *phba)
 {
         struct be_mcc_compl *compl;
         int num = 0, status = 0;
@@ -161,7 +161,7 @@ static int be_mcc_wait_compl(struct beiscsi_hba *phba)
 #define mcc_timeout             120000 /* 5s timeout */
         int i, status;
         for (i = 0; i < mcc_timeout; i++) {
-                status = be_process_mcc(phba);
+                status = beiscsi_process_mcc(phba);
                 if (status)
                         return status;
 
@@ -504,7 +504,7 @@ static u32 be_encoded_q_len(int q_len)
         return len_encoded;
 }
 
-int be_cmd_mccq_create(struct beiscsi_hba *phba,
+int beiscsi_cmd_mccq_create(struct beiscsi_hba *phba,
                         struct be_queue_info *mccq,
                         struct be_queue_info *cq)
 {
diff --git a/drivers/scsi/be2iscsi/be_cmds.h b/drivers/scsi/be2iscsi/be_cmds.h
index 76fe1f9dd4cb..5de8acb924cb 100644
--- a/drivers/scsi/be2iscsi/be_cmds.h
+++ b/drivers/scsi/be2iscsi/be_cmds.h
@@ -418,7 +418,7 @@ int beiscsi_cmd_cq_create(struct be_ctrl_info *ctrl,
 
 int beiscsi_cmd_q_destroy(struct be_ctrl_info *ctrl, struct be_queue_info *q,
                           int type);
-int be_cmd_mccq_create(struct beiscsi_hba *phba,
+int beiscsi_cmd_mccq_create(struct beiscsi_hba *phba,
                         struct be_queue_info *mccq,
                         struct be_queue_info *cq);
 
diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 2c3e99eeff82..d15df07ba783 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -40,6 +40,7 @@
 static unsigned int be_iopoll_budget = 10;
 static unsigned int be_max_phys_size = 64;
 static unsigned int enable_msix = 1;
+static unsigned int ring_mode;
 
 MODULE_DEVICE_TABLE(pci, beiscsi_pci_id_table);
 MODULE_DESCRIPTION(DRV_DESC " " BUILD_STR);
@@ -670,8 +671,9 @@ static void
 free_wrb_handle(struct beiscsi_hba *phba, struct hwi_wrb_context *pwrb_context,
                 struct wrb_handle *pwrb_handle)
 {
-
-        pwrb_context->pwrb_handle_base[pwrb_context->free_index] = pwrb_handle;
+        if (!ring_mode)
+                pwrb_context->pwrb_handle_base[pwrb_context->free_index] =
+                                               pwrb_handle;
         pwrb_context->wrb_handles_available++;
         if (pwrb_context->free_index == (phba->params.wrbs_per_cxn - 1))
                 pwrb_context->free_index = 0;
@@ -857,6 +859,7 @@ hwi_complete_drvr_msgs(struct beiscsi_conn *beiscsi_conn,
 {
         struct hwi_wrb_context *pwrb_context;
         struct wrb_handle *pwrb_handle = NULL;
+        struct sgl_handle *psgl_handle = NULL;
         struct hwi_controller *phwi_ctrlr;
         struct iscsi_task *task;
         struct beiscsi_io_task *io_task;
@@ -864,13 +867,23 @@ hwi_complete_drvr_msgs(struct beiscsi_conn *beiscsi_conn,
         struct iscsi_session *session = conn->session;
 
         phwi_ctrlr = phba->phwi_ctrlr;
-        pwrb_context = &phwi_ctrlr->wrb_context[((psol->
-                        dw[offsetof(struct amap_sol_cqe, cid) / 32] &
-                        SOL_CID_MASK) >> 6)];
-        pwrb_handle = pwrb_context->pwrb_handle_basestd[((psol->
-                        dw[offsetof(struct amap_sol_cqe, wrb_index) /
-                        32] & SOL_WRB_INDEX_MASK) >> 16)];
-        task = pwrb_handle->pio_handle;
+        if (ring_mode) {
+                psgl_handle = phba->sgl_hndl_array[((psol->
+                              dw[offsetof(struct amap_sol_cqe_ring, icd_index) /
+                                32] & SOL_ICD_INDEX_MASK) >> 6)];
+                pwrb_context = &phwi_ctrlr->wrb_context[psgl_handle->cid];
+                task = psgl_handle->task;
+                pwrb_handle = NULL;
+        } else {
+                pwrb_context = &phwi_ctrlr->wrb_context[((psol->
+                                dw[offsetof(struct amap_sol_cqe, cid) / 32] &
+                                SOL_CID_MASK) >> 6)];
+                pwrb_handle = pwrb_context->pwrb_handle_basestd[((psol->
+                                dw[offsetof(struct amap_sol_cqe, wrb_index) /
+                                32] & SOL_WRB_INDEX_MASK) >> 16)];
+                task = pwrb_handle->pio_handle;
+        }
+
         io_task = task->dd_data;
         spin_lock(&phba->mgmt_sgl_lock);
         free_mgmt_sgl_handle(phba, io_task->psgl_handle);
@@ -910,23 +923,31 @@ static void hwi_complete_cmd(struct beiscsi_conn *beiscsi_conn,
         struct iscsi_wrb *pwrb = NULL;
         struct hwi_controller *phwi_ctrlr;
         struct iscsi_task *task;
+        struct sgl_handle *psgl_handle = NULL;
         unsigned int type;
         struct iscsi_conn *conn = beiscsi_conn->conn;
         struct iscsi_session *session = conn->session;
 
         phwi_ctrlr = phba->phwi_ctrlr;
-        pwrb_context = &phwi_ctrlr->
-                        wrb_context[((psol->dw[offsetof
-                        (struct amap_sol_cqe, cid) / 32]
-                        & SOL_CID_MASK) >> 6)];
-        pwrb_handle = pwrb_context->pwrb_handle_basestd[((psol->
-                        dw[offsetof(struct amap_sol_cqe, wrb_index) /
-                        32] & SOL_WRB_INDEX_MASK) >> 16)];
-        task = pwrb_handle->pio_handle;
-        pwrb = pwrb_handle->pwrb;
-        type = (pwrb->dw[offsetof(struct amap_iscsi_wrb, type) / 32] &
+        if (ring_mode) {
+                psgl_handle = phba->sgl_hndl_array[((psol->
+                              dw[offsetof(struct amap_sol_cqe_ring, icd_index) /
+                              32] & SOL_ICD_INDEX_MASK) >> 6)];
+                task = psgl_handle->task;
+                type = psgl_handle->type;
+        } else {
+                pwrb_context = &phwi_ctrlr->
+                                wrb_context[((psol->dw[offsetof
+                                (struct amap_sol_cqe, cid) / 32]
+                                & SOL_CID_MASK) >> 6)];
+                pwrb_handle = pwrb_context->pwrb_handle_basestd[((psol->
+                                dw[offsetof(struct amap_sol_cqe, wrb_index) /
+                                32] & SOL_WRB_INDEX_MASK) >> 16)];
+                task = pwrb_handle->pio_handle;
+                pwrb = pwrb_handle->pwrb;
+                type = (pwrb->dw[offsetof(struct amap_iscsi_wrb, type) / 32] &
                          WRB_TYPE_MASK) >> 28;
-
+        }
         spin_lock_bh(&session->lock);
         switch (type) {
         case HWH_TYPE_IO:
@@ -957,15 +978,24 @@ static void hwi_complete_cmd(struct beiscsi_conn *beiscsi_conn,
                 break;
 
         default:
-                shost_printk(KERN_WARNING, phba->shost,
-                        "In hwi_complete_cmd, unknown type = %d"
-                        "wrb_index 0x%x CID 0x%x\n", type,
-                        ((psol->dw[offsetof(struct amap_iscsi_wrb,
-                        type) / 32] & SOL_WRB_INDEX_MASK) >> 16),
-                        ((psol->dw[offsetof(struct amap_sol_cqe,
-                        cid) / 32] & SOL_CID_MASK) >> 6));
+                if (ring_mode)
+                        shost_printk(KERN_WARNING, phba->shost,
+                                "In hwi_complete_cmd, unknown type = %d"
+                                "icd_index 0x%x CID 0x%x\n", type,
+                                ((psol->dw[offsetof(struct amap_sol_cqe_ring,
+                                icd_index) / 32] & SOL_ICD_INDEX_MASK) >> 6),
+                                psgl_handle->cid);
+                else
+                        shost_printk(KERN_WARNING, phba->shost,
+                                "In hwi_complete_cmd, unknown type = %d"
+                                "wrb_index 0x%x CID 0x%x\n", type,
+                                ((psol->dw[offsetof(struct amap_iscsi_wrb,
+                                type) / 32] & SOL_WRB_INDEX_MASK) >> 16),
+                                ((psol->dw[offsetof(struct amap_sol_cqe,
+                                cid) / 32] & SOL_CID_MASK) >> 6));
                 break;
         }
+
         spin_unlock_bh(&session->lock);
 }
 
@@ -1401,6 +1431,7 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
         unsigned int num_processed = 0;
         unsigned int tot_nump = 0;
         struct beiscsi_conn *beiscsi_conn;
+        struct sgl_handle *psgl_handle = NULL;
         struct beiscsi_hba *phba;
 
         cq = pbe_eq->cq;
@@ -1411,17 +1442,32 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
                CQE_VALID_MASK) {
                 be_dws_le_to_cpu(sol, sizeof(struct sol_cqe));
 
-                beiscsi_conn = phba->conn_table[(u32) (sol->
+                if (ring_mode) {
+                        psgl_handle = phba->sgl_hndl_array[((sol->
+                                      dw[offsetof(struct amap_sol_cqe_ring,
+                                      icd_index) / 32] & SOL_ICD_INDEX_MASK)
+                                      >> 6)];
+                        beiscsi_conn = phba->conn_table[psgl_handle->cid];
+                        if (!beiscsi_conn || !beiscsi_conn->ep) {
+                                shost_printk(KERN_WARNING, phba->shost,
+                                     "Connection table empty for cid = %d\n",
+                                      psgl_handle->cid);
+                                return 0;
+                        }
+
+                } else {
+                        beiscsi_conn = phba->conn_table[(u32) (sol->
                                  dw[offsetof(struct amap_sol_cqe, cid) / 32] &
                                  SOL_CID_MASK) >> 6];
 
-                if (!beiscsi_conn || !beiscsi_conn->ep) {
-                        shost_printk(KERN_WARNING, phba->shost,
+                        if (!beiscsi_conn || !beiscsi_conn->ep) {
+                                shost_printk(KERN_WARNING, phba->shost,
                                      "Connection table empty for cid = %d\n",
                                      (u32)(sol->dw[offsetof(struct amap_sol_cqe,
                                      cid) / 32] & SOL_CID_MASK) >> 6);
                                 return 0;
                         }
+                }
 
                 if (num_processed >= 32) {
                         hwi_ring_cq_db(phba, cq->id,
@@ -1465,13 +1511,21 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
                 case CMD_CXN_KILLED_ITT_INVALID:
                 case CMD_CXN_KILLED_SEQ_OUTOFORDER:
                 case CMD_CXN_KILLED_INVALID_DATASN_RCVD:
-                        SE_DEBUG(DBG_LVL_1,
+                        if (ring_mode) {
+                                SE_DEBUG(DBG_LVL_1,
+                                 "CQ Error notification for cmd.. "
+                                 "code %d cid 0x%x\n",
+                                 sol->dw[offsetof(struct amap_sol_cqe, code) /
+                                 32] & CQE_CODE_MASK, psgl_handle->cid);
+                        } else {
+                                SE_DEBUG(DBG_LVL_1,
                                  "CQ Error notification for cmd.. "
                                  "code %d cid 0x%x\n",
                                  sol->dw[offsetof(struct amap_sol_cqe, code) /
                                  32] & CQE_CODE_MASK,
                                  (sol->dw[offsetof(struct amap_sol_cqe, cid) /
                                  32] & SOL_CID_MASK));
+                        }
                         break;
                 case UNSOL_DATA_DIGEST_ERROR_NOTIFY:
                         SE_DEBUG(DBG_LVL_1,
@@ -1493,23 +1547,37 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
                 case CXN_KILLED_OVER_RUN_RESIDUAL:
                 case CXN_KILLED_UNDER_RUN_RESIDUAL:
                 case CXN_KILLED_CMND_DATA_NOT_ON_SAME_CONN:
-                        SE_DEBUG(DBG_LVL_1, "CQ Error %d, reset CID "
+                        if (ring_mode) {
+                                SE_DEBUG(DBG_LVL_1, "CQ Error %d, reset CID "
+                                 "0x%x...\n",
+                                 sol->dw[offsetof(struct amap_sol_cqe, code) /
+                                 32] & CQE_CODE_MASK, psgl_handle->cid);
+                        } else {
+                                SE_DEBUG(DBG_LVL_1, "CQ Error %d, reset CID "
                                  "0x%x...\n",
                                  sol->dw[offsetof(struct amap_sol_cqe, code) /
                                  32] & CQE_CODE_MASK,
                                  sol->dw[offsetof(struct amap_sol_cqe, cid) /
                                  32] & CQE_CID_MASK);
+                        }
                         iscsi_conn_failure(beiscsi_conn->conn,
                                            ISCSI_ERR_CONN_FAILED);
                         break;
                 case CXN_KILLED_RST_SENT:
                 case CXN_KILLED_RST_RCVD:
-                        SE_DEBUG(DBG_LVL_1, "CQ Error %d, reset"
+                        if (ring_mode) {
+                                SE_DEBUG(DBG_LVL_1, "CQ Error %d, reset"
+                                "received/sent on CID 0x%x...\n",
+                                 sol->dw[offsetof(struct amap_sol_cqe, code) /
+                                 32] & CQE_CODE_MASK, psgl_handle->cid);
+                        } else {
+                                SE_DEBUG(DBG_LVL_1, "CQ Error %d, reset"
                                 "received/sent on CID 0x%x...\n",
                                  sol->dw[offsetof(struct amap_sol_cqe, code) /
                                  32] & CQE_CODE_MASK,
                                  sol->dw[offsetof(struct amap_sol_cqe, cid) /
                                  32] & CQE_CID_MASK);
+                        }
                         iscsi_conn_failure(beiscsi_conn->conn,
                                            ISCSI_ERR_CONN_FAILED);
                         break;
@@ -2674,7 +2742,7 @@ static int be_mcc_queues_create(struct beiscsi_hba *phba,
                 goto mcc_cq_destroy;
 
         /* Ask BE to create MCC queue */
-        if (be_cmd_mccq_create(phba, q, cq))
+        if (beiscsi_cmd_mccq_create(phba, q, cq))
                 goto mcc_q_free;
 
         return 0;
@@ -2735,6 +2803,10 @@ static int hwi_init_port(struct beiscsi_hba *phba)
                 goto error;
         }
 
+        if (phba->fw_config.iscsi_features == 0x1)
+                ring_mode = 1;
+        else
+                ring_mode = 0;
         status = mgmt_get_fw_config(ctrl, phba);
         if (status != 0) {
                 shost_printk(KERN_ERR, phba->shost,
@@ -2869,6 +2941,17 @@ static int beiscsi_init_sgl_handle(struct beiscsi_hba *phba)
         phba->io_sgl_hndl_avbl = 0;
         phba->eh_sgl_hndl_avbl = 0;
 
+        if (ring_mode) {
+                phba->sgl_hndl_array = kzalloc(sizeof(struct sgl_handle *) *
+                                              phba->params.icds_per_ctrl,
+                                                 GFP_KERNEL);
+                if (!phba->sgl_hndl_array) {
+                        shost_printk(KERN_ERR, phba->shost,
+                             "Mem Alloc Failed. Failing to load\n");
+                        return -ENOMEM;
+                }
+        }
+
         mem_descr_sglh = phba->init_mem;
         mem_descr_sglh += HWI_MEM_SGLH;
         if (1 == mem_descr_sglh->num_elements) {
@@ -2876,6 +2959,8 @@ static int beiscsi_init_sgl_handle(struct beiscsi_hba *phba)
                                                  phba->params.ios_per_ctrl,
                                                  GFP_KERNEL);
                 if (!phba->io_sgl_hndl_base) {
+                        if (ring_mode)
+                                kfree(phba->sgl_hndl_array);
                         shost_printk(KERN_ERR, phba->shost,
                                      "Mem Alloc Failed. Failing to load\n");
                         return -ENOMEM;
@@ -3060,6 +3145,8 @@ static int beiscsi_init_port(struct beiscsi_hba *phba)
         if (hba_setup_cid_tbls(phba)) {
                 shost_printk(KERN_ERR, phba->shost,
                              "Failed in hba_setup_cid_tbls\n");
+                if (ring_mode)
+                        kfree(phba->sgl_hndl_array);
                 kfree(phba->io_sgl_hndl_base);
                 kfree(phba->eh_sgl_hndl_base);
                 goto do_cleanup_ctrlr;
@@ -3110,6 +3197,8 @@ static void beiscsi_clean_port(struct beiscsi_hba *phba)
                              "mgmt_epfw_cleanup FAILED \n");
         hwi_cleanup(phba);
         hwi_purge_eq(phba);
+        if (ring_mode)
+                kfree(phba->sgl_hndl_array);
         kfree(phba->io_sgl_hndl_base);
         kfree(phba->eh_sgl_hndl_base);
         kfree(phba->cid_array);
@@ -3194,7 +3283,8 @@ beiscsi_offload_connection(struct beiscsi_conn *beiscsi_conn,
         be_dws_le_to_cpu(pwrb, sizeof(struct iscsi_target_context_update_wrb));
 
         doorbell |= beiscsi_conn->beiscsi_conn_cid & DB_WRB_POST_CID_MASK;
-        doorbell |= (pwrb_handle->wrb_index & DB_DEF_PDU_WRB_INDEX_MASK)
+        if (!ring_mode)
+                doorbell |= (pwrb_handle->wrb_index & DB_DEF_PDU_WRB_INDEX_MASK)
                              << DB_DEF_PDU_WRB_INDEX_SHIFT;
         doorbell |= 1 << DB_DEF_PDU_NUM_POSTED_SHIFT;
 
@@ -3280,7 +3370,14 @@ static int beiscsi_alloc_pdu(struct iscsi_task *task, uint8_t opcode)
         itt = (itt_t) cpu_to_be32(((unsigned int)io_task->pwrb_handle->
                                  wrb_index << 16) | (unsigned int)
                                 (io_task->psgl_handle->sgl_index));
-        io_task->pwrb_handle->pio_handle = task;
+        if (ring_mode) {
+                phba->sgl_hndl_array[io_task->psgl_handle->sgl_index -
+                                     phba->fw_config.iscsi_cid_start] =
+                                     io_task->psgl_handle;
+                io_task->psgl_handle->task = task;
+                io_task->psgl_handle->cid = beiscsi_conn->beiscsi_conn_cid;
+        } else
+                io_task->pwrb_handle->pio_handle = task;
 
         io_task->cmd_bhs->iscsi_hdr.itt = itt;
         return 0;
@@ -3363,11 +3460,17 @@ static int beiscsi_iotask(struct iscsi_task *task, struct scatterlist *sg,
                               ISCSI_OPCODE_SCSI_DATA_OUT);
                 AMAP_SET_BITS(struct amap_pdu_data_out, final_bit,
                               &io_task->cmd_bhs->iscsi_data_pdu, 1);
-                AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
+                if (ring_mode)
+                        io_task->psgl_handle->type = INI_WR_CMD;
+                else
+                        AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
                                       INI_WR_CMD);
                 AMAP_SET_BITS(struct amap_iscsi_wrb, dsp, pwrb, 1);
         } else {
-                AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
+                if (ring_mode)
+                        io_task->psgl_handle->type = INI_RD_CMD;
+                else
+                        AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
                                       INI_RD_CMD);
                 AMAP_SET_BITS(struct amap_iscsi_wrb, dsp, pwrb, 0);
         }
@@ -3393,7 +3496,8 @@ static int beiscsi_iotask(struct iscsi_task *task, struct scatterlist *sg,
         be_dws_le_to_cpu(pwrb, sizeof(struct iscsi_wrb));
 
         doorbell |= beiscsi_conn->beiscsi_conn_cid & DB_WRB_POST_CID_MASK;
-        doorbell |= (io_task->pwrb_handle->wrb_index &
+        if (!ring_mode)
+                doorbell |= (io_task->pwrb_handle->wrb_index &
                      DB_DEF_PDU_WRB_INDEX_MASK) << DB_DEF_PDU_WRB_INDEX_SHIFT;
         doorbell |= 1 << DB_DEF_PDU_NUM_POSTED_SHIFT;
 
@@ -3427,19 +3531,28 @@ static int beiscsi_mtask(struct iscsi_task *task)
 
         switch (task->hdr->opcode & ISCSI_OPCODE_MASK) {
         case ISCSI_OP_LOGIN:
-                AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
+                if (ring_mode)
+                        io_task->psgl_handle->type = TGT_DM_CMD;
+                else
+                        AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
                                       TGT_DM_CMD);
                 AMAP_SET_BITS(struct amap_iscsi_wrb, dmsg, pwrb, 0);
                 AMAP_SET_BITS(struct amap_iscsi_wrb, cmdsn_itt, pwrb, 1);
                 hwi_write_buffer(pwrb, task);
                 break;
         case ISCSI_OP_NOOP_OUT:
-                AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
+                if (ring_mode)
+                        io_task->psgl_handle->type = INI_RD_CMD;
+                else
+                        AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
                                       INI_RD_CMD);
                 hwi_write_buffer(pwrb, task);
                 break;
         case ISCSI_OP_TEXT:
-                AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
+                if (ring_mode)
+                        io_task->psgl_handle->type = INI_WR_CMD;
+                else
+                        AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
                                       INI_WR_CMD);
                 AMAP_SET_BITS(struct amap_iscsi_wrb, dsp, pwrb, 1);
                 hwi_write_buffer(pwrb, task);
@@ -3462,13 +3575,19 @@ static int beiscsi_mtask(struct iscsi_task *task)
                 mgmt_invalidate_icds(phba,
                                      aborted_io_task->psgl_handle->sgl_index,
                                      cid);
-                AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
+                if (ring_mode)
+                        io_task->psgl_handle->type = INI_TMF_CMD;
+                else
+                        AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
                                       INI_TMF_CMD);
                 AMAP_SET_BITS(struct amap_iscsi_wrb, dmsg, pwrb, 0);
                 hwi_write_buffer(pwrb, task);
                 break;
         case ISCSI_OP_LOGOUT:
                 AMAP_SET_BITS(struct amap_iscsi_wrb, dmsg, pwrb, 0);
+                if (ring_mode)
+                        io_task->psgl_handle->type = HWH_TYPE_LOGOUT;
+                else
                 AMAP_SET_BITS(struct amap_iscsi_wrb, type, pwrb,
                                 HWH_TYPE_LOGOUT);
                 hwi_write_buffer(pwrb, task);
@@ -3487,7 +3606,8 @@ static int beiscsi_mtask(struct iscsi_task *task)
         be_dws_le_to_cpu(pwrb, sizeof(struct iscsi_wrb));
 
         doorbell |= cid & DB_WRB_POST_CID_MASK;
-        doorbell |= (io_task->pwrb_handle->wrb_index &
+        if (!ring_mode)
+                doorbell |= (io_task->pwrb_handle->wrb_index &
                      DB_DEF_PDU_WRB_INDEX_MASK) << DB_DEF_PDU_WRB_INDEX_SHIFT;
         doorbell |= 1 << DB_DEF_PDU_NUM_POSTED_SHIFT;
         iowrite32(doorbell, phba->db_va + DB_TXULP0_OFFSET);
@@ -3797,6 +3917,7 @@ static int __init beiscsi_module_init(void)
                          "beiscsi pci driver.\n");
                 goto unregister_iscsi_transport;
         }
+        ring_mode = 0;
         return 0;
 
 unregister_iscsi_transport: