esp_scsi: make number of tags configurable
Add a field 'num_tags' to the esp structure to allow drivers
to overwrite the number of avialable tags if required.
Default is ESP_DEFAULT_TAGS.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
index 7e7687f..57ccb14 100644
--- a/drivers/scsi/esp_scsi.c
+++ b/drivers/scsi/esp_scsi.c
@@ -2317,6 +2317,10 @@
static int instance;
int err;
+ if (!esp->num_tags)
+ esp->num_tags = ESP_DEFAULT_TAGS;
+ else if (esp->num_tags >= ESP_MAX_TAG)
+ esp->num_tags = ESP_MAX_TAG - 1;
esp->host->transportt = esp_transport_template;
esp->host->max_lun = ESP_MAX_LUN;
esp->host->cmd_per_lun = 2;
@@ -2403,12 +2407,8 @@
struct esp *esp = shost_priv(dev->host);
struct esp_target_data *tp = &esp->target[dev->id];
- if (dev->tagged_supported) {
- /* XXX make this configurable somehow XXX */
- int goal_tags = min(ESP_DEFAULT_TAGS, ESP_MAX_TAG);
-
- scsi_change_queue_depth(dev, goal_tags);
- }
+ if (dev->tagged_supported)
+ scsi_change_queue_depth(dev, esp->num_tags);
tp->flags |= ESP_TGT_DISCONNECT;
diff --git a/drivers/scsi/esp_scsi.h b/drivers/scsi/esp_scsi.h
index b5862e4..975d293 100644
--- a/drivers/scsi/esp_scsi.h
+++ b/drivers/scsi/esp_scsi.h
@@ -283,7 +283,6 @@
struct completion *eh_done;
};
-/* XXX make this configurable somehow XXX */
#define ESP_DEFAULT_TAGS 16
#define ESP_MAX_TARGET 16
@@ -445,7 +444,7 @@
u8 prev_soff;
u8 prev_stp;
u8 prev_cfg3;
- u8 __pad;
+ u8 num_tags;
struct list_head esp_cmd_pool;