[SCSI] qla4xxx: Added Get ACB support using BSG

This command is used to read ACB params from firmware

Signed-off-by: Harish Zunjarrao <harish.zunjarrao@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/qla4xxx/ql4_bsg.c

@@ -381,6 +381,71 @@ leave:
 	return rval;
 }
 
+static int
+qla4xxx_bsg_get_acb(struct bsg_job *bsg_job)
+{
+	struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+	struct scsi_qla_host *ha = to_qla_host(host);
+	struct iscsi_bsg_request *bsg_req = bsg_job->request;
+	struct iscsi_bsg_reply *bsg_reply = bsg_job->reply;
+	uint32_t acb_type = 0;
+	uint32_t len = 0;
+	dma_addr_t acb_dma;
+	uint8_t *acb = NULL;
+	int rval = -EINVAL;
+
+	bsg_reply->reply_payload_rcv_len = 0;
+
+	if (unlikely(pci_channel_offline(ha->pdev)))
+		goto leave;
+
+	/* Only 4022 and above adapters are supported */
+	if (is_qla4010(ha))
+		goto leave;
+
+	if (ql4xxx_reset_active(ha)) {
+		ql4_printk(KERN_ERR, ha, "%s: reset active\n", __func__);
+		rval = -EBUSY;
+		goto leave;
+	}
+
+	acb_type = bsg_req->rqst_data.h_vendor.vendor_cmd[1];
+	len = bsg_job->reply_payload.payload_len;
+	if (len < sizeof(struct addr_ctrl_blk)) {
+		ql4_printk(KERN_ERR, ha, "%s: invalid acb len %d\n",
+			   __func__, len);
+		rval = -EINVAL;
+		goto leave;
+	}
+
+	acb = dma_alloc_coherent(&ha->pdev->dev, len, &acb_dma, GFP_KERNEL);
+	if (!acb) {
+		ql4_printk(KERN_ERR, ha, "%s: dma alloc failed for acb "
+			   "data\n", __func__);
+		rval = -ENOMEM;
+		goto leave;
+	}
+
+	rval = qla4xxx_get_acb(ha, acb_dma, acb_type, len);
+	if (rval) {
+		ql4_printk(KERN_ERR, ha, "%s: get acb failed\n", __func__);
+		bsg_reply->result = DID_ERROR << 16;
+		rval = -EIO;
+	} else {
+		bsg_reply->reply_payload_rcv_len =
+			sg_copy_from_buffer(bsg_job->reply_payload.sg_list,
+					    bsg_job->reply_payload.sg_cnt,
+					    acb, len);
+		bsg_reply->result = DID_OK << 16;
+	}
+
+	bsg_job_done(bsg_job, bsg_reply->result,
+		     bsg_reply->reply_payload_rcv_len);
+	dma_free_coherent(&ha->pdev->dev, len, acb, acb_dma);
+leave:
+	return rval;
+}
+
 /**
  * qla4xxx_process_vendor_specific - handle vendor specific bsg request
  * @job: iscsi_bsg_job to handle
@@ -411,6 +476,9 @@ int qla4xxx_process_vendor_specific(struct bsg_job *bsg_job)
 	case QLISCSI_VND_RESTORE_DEFAULTS:
 		return qla4xxx_restore_defaults(bsg_job);
 
+	case QLISCSI_VND_GET_ACB:
+		return qla4xxx_bsg_get_acb(bsg_job);
+
 	default:
 		ql4_printk(KERN_ERR, ha, "%s: invalid BSG vendor command: "
 			   "0x%x\n", __func__, bsg_req->msgcode);

drivers/scsi/qla4xxx/ql4_bsg.h

@@ -14,5 +14,6 @@
 #define QLISCSI_VND_READ_NVRAM		4
 #define QLISCSI_VND_UPDATE_NVRAM	5
 #define QLISCSI_VND_RESTORE_DEFAULTS	6
+#define QLISCSI_VND_GET_ACB		7
 
 #endif

drivers/scsi/qla4xxx/ql4_glbl.h

@@ -56,8 +56,8 @@ int qla4xxx_conn_close_sess_logout(struct scsi_qla_host *ha,
 int qla4xxx_disable_acb(struct scsi_qla_host *ha);
 int qla4xxx_set_acb(struct scsi_qla_host *ha, uint32_t *mbox_cmd,
 		    uint32_t *mbox_sts, dma_addr_t acb_dma);
-int qla4xxx_get_acb(struct scsi_qla_host *ha, uint32_t *mbox_cmd,
-		    uint32_t *mbox_sts, dma_addr_t acb_dma);
+int qla4xxx_get_acb(struct scsi_qla_host *ha, dma_addr_t acb_dma,
+		    uint32_t acb_type, uint32_t len);
 int qla4xxx_get_ip_state(struct scsi_qla_host *ha, uint32_t acb_idx,
 			 uint32_t ip_idx, uint32_t *sts);
 void qla4xxx_mark_device_missing(struct iscsi_cls_session *cls_session);

drivers/scsi/qla4xxx/ql4_mbx.c

@@ -1425,18 +1425,21 @@ int qla4xxx_disable_acb(struct scsi_qla_host *ha)
 	return status;
 }
 
-int qla4xxx_get_acb(struct scsi_qla_host *ha, uint32_t *mbox_cmd,
-		    uint32_t *mbox_sts, dma_addr_t acb_dma)
+int qla4xxx_get_acb(struct scsi_qla_host *ha, dma_addr_t acb_dma,
+		    uint32_t acb_type, uint32_t len)
 {
+	uint32_t mbox_cmd[MBOX_REG_COUNT];
+	uint32_t mbox_sts[MBOX_REG_COUNT];
 	int status = QLA_SUCCESS;
 
-	memset(mbox_cmd, 0, sizeof(mbox_cmd[0]) * MBOX_REG_COUNT);
-	memset(mbox_sts, 0, sizeof(mbox_sts[0]) * MBOX_REG_COUNT);
+	memset(&mbox_cmd, 0, sizeof(mbox_cmd));
+	memset(&mbox_sts, 0, sizeof(mbox_sts));
+
 	mbox_cmd[0] = MBOX_CMD_GET_ACB;
-	mbox_cmd[1] = 0; /* Primary ACB */
+	mbox_cmd[1] = acb_type;
 	mbox_cmd[2] = LSDW(acb_dma);
 	mbox_cmd[3] = MSDW(acb_dma);
-	mbox_cmd[4] = sizeof(struct addr_ctrl_blk);
+	mbox_cmd[4] = len;
 
 	status = qla4xxx_mailbox_command(ha, 5, 5, &mbox_cmd[0], &mbox_sts[0]);
 	if (status != QLA_SUCCESS) {