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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>
This commit is contained in:
Hannes Reinecke 2014-11-24 15:37:20 +01:00 committed by Christoph Hellwig
parent a87bf29362
commit 3707a186c8
2 changed files with 7 additions and 8 deletions
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12
drivers/scsi/esp_scsi.c
View File

@ -2317,6 +2317,10 @@ int scsi_esp_register(struct esp *esp, struct device *dev)
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 @@ static int esp_slave_configure(struct scsi_device *dev)
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;

3
drivers/scsi/esp_scsi.h
View File

@ -283,7 +283,6 @@ struct esp_cmd_entry {
struct completion *eh_done;
};
/* XXX make this configurable somehow XXX */
#define ESP_DEFAULT_TAGS 16
#define ESP_MAX_TARGET 16
@ -445,7 +444,7 @@ struct esp {
u8 prev_soff;
u8 prev_stp;
u8 prev_cfg3;
u8 __pad;
u8 num_tags;
struct list_head esp_cmd_pool;