Drivers: scsi: storvsc: Change the limits to reflect the values on the host

Hyper-V hosts can support multiple targets and multiple channels and larger number of
LUNs per target. Update the code to reflect this. With this patch we can correctly
enumerate all the paths in a multi-path storage environment.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 31 insertions, 16 deletions

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 9969fa1ef7c4..8938b133faa8 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -330,17 +330,17 @@ static int storvsc_timeout = 180;
 
 static void storvsc_on_channel_callback(void *context);
 
-/*
- * In Hyper-V, each port/path/target maps to 1 scsi host adapter.  In
- * reality, the path/target is not used (ie always set to 0) so our
- * scsi host adapter essentially has 1 bus with 1 target that contains
- * up to 256 luns.
- */
-#define STORVSC_MAX_LUNS_PER_TARGET                     64
-#define STORVSC_MAX_TARGETS                             1
-#define STORVSC_MAX_CHANNELS                            1
+#define STORVSC_MAX_LUNS_PER_TARGET                     255
+#define STORVSC_MAX_TARGETS                             2
+#define STORVSC_MAX_CHANNELS                            8
 
+#define STORVSC_FC_MAX_LUNS_PER_TARGET                  255
+#define STORVSC_FC_MAX_TARGETS                          128
+#define STORVSC_FC_MAX_CHANNELS                         8
 
+#define STORVSC_IDE_MAX_LUNS_PER_TARGET                 64
+#define STORVSC_IDE_MAX_TARGETS                         1
+#define STORVSC_IDE_MAX_CHANNELS                        1
 
 struct storvsc_cmd_request {
         struct list_head entry;
@@ -1691,7 +1691,6 @@ static struct scsi_host_template scsi_driver = {
         .slave_destroy =        storvsc_device_destroy,
         .slave_configure =      storvsc_device_configure,
         .cmd_per_lun =          1,
-        /* 64 max_queue * 1 target */
         .can_queue =            STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
         .this_id =              -1,
         /* no use setting to 0 since ll_blk_rw reset it to 1 */
@@ -1756,6 +1755,9 @@ static int storvsc_probe(struct hv_device *device,
         }
 
 
+        if (dev_id->driver_data == SFC_GUID)
+                scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS *
+                                         STORVSC_FC_MAX_TARGETS);
         host = scsi_host_alloc(&scsi_driver,
                                sizeof(struct hv_host_device));
         if (!host)
@@ -1789,12 +1791,25 @@ static int storvsc_probe(struct hv_device *device,
         host_dev->path = stor_device->path_id;
         host_dev->target = stor_device->target_id;
 
-        /* max # of devices per target */
-        host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
-        /* max # of targets per channel */
-        host->max_id = STORVSC_MAX_TARGETS;
-        /* max # of channels */
-        host->max_channel = STORVSC_MAX_CHANNELS - 1;
+        switch (dev_id->driver_data) {
+        case SFC_GUID:
+                host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;
+                host->max_id = STORVSC_FC_MAX_TARGETS;
+                host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;
+                break;
+
+        case SCSI_GUID:
+                host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
+                host->max_id = STORVSC_MAX_TARGETS;
+                host->max_channel = STORVSC_MAX_CHANNELS - 1;
+                break;
+
+        default:
+                host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;
+                host->max_id = STORVSC_IDE_MAX_TARGETS;
+                host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;
+                break;
+        }
         /* max cmd length */
         host->max_cmd_len = STORVSC_MAX_CMD_LEN;