linux-kernel - [PATCH v4 3/3] ibmvscsi: Allow to configure maximum LUN

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Date:	Mon,  9 Nov 2015 15:47:45 +0100
From:	Laurent Vivier <lvivier@...hat.com>
To:	martin.petersen@...cle.com
Cc:	hare@...e.de, brking@...ux.vnet.ibm.com, tyreld@...ux.vnet.ibm.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	lvivier@...hat.com
Subject: [PATCH v4 3/3] ibmvscsi: Allow to configure maximum LUN

This patch allows to define the maximum LUN numbers.
As defined in 4.6.9 of SAM-4, the encoding of LUN is
on 5 bits (max_lun=32) and the current value is only 8.

Signed-off-by: Laurent Vivier <lvivier@...hat.com>
---
 drivers/scsi/ibmvscsi/ibmvscsi.c | 9 ++++++++-
 drivers/scsi/ibmvscsi/ibmvscsi.h | 1 +
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 04de287..adcd5e8 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -84,6 +84,7 @@
  */
 static int max_id = 64;
 static int max_channel = 3;
+static int max_lun = 8;
 static int init_timeout = 300;
 static int login_timeout = 60;
 static int info_timeout = 30;
@@ -117,6 +118,9 @@ module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
 module_param_named(client_reserve, client_reserve, int, S_IRUGO );
 MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
+module_param(max_lun, int, S_IRUGO);
+MODULE_PARM_DESC(max_lun, "Maximum allowed LUN "
+                          "[Default=8,Max="__stringify(IBMVSCSI_MAX_LUN)"]");
 
 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
 				struct ibmvscsi_host_data *hostdata);
@@ -2289,7 +2293,7 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 		goto init_pool_failed;
 	}
 
-	host->max_lun = 8;
+	host->max_lun = max_lun;
 	host->max_id = max_id;
 	host->max_channel = max_channel;
 	host->max_cmd_len = 16;
@@ -2414,6 +2418,9 @@ int __init ibmvscsi_module_init(void)
 {
 	int ret;
 
+	if (max_lun > IBMVSCSI_MAX_LUN)
+		return -EINVAL;
+
 	/* Ensure we have two requests to do error recovery */
 	driver_template.can_queue = max_requests;
 	max_events = max_requests + 2;
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h
index 7d64867..1067367 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.h
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.h
@@ -48,6 +48,7 @@ struct Scsi_Host;
 #define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16
 #define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */
 #define IBMVSCSI_MAX_CMDS_PER_LUN 64
+#define IBMVSCSI_MAX_LUN 32
 
 /* ------------------------------------------------------------
  * Data Structures
-- 
2.1.0

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