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nvmet: expose max queues to configfs

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Allow to set the max queues the target supports. This is useful for
testing the reconnect attempt of the host with changing numbers of
supported queues.

Signed-off-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Daniel Wagner 2022-08-29 11:28:39 +02:00 committed by Christoph Hellwig
parent d416800776
commit 3e980f5995
1 changed files with 29 additions and 0 deletions
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29
drivers/nvme/target/configfs.c
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@ -1281,6 +1281,34 @@ static ssize_t nvmet_subsys_attr_pi_enable_store(struct config_item *item,
CONFIGFS_ATTR(nvmet_subsys_, attr_pi_enable);
#endif
static ssize_t nvmet_subsys_attr_qid_max_show(struct config_item *item,
char *page)
{
return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->max_qid);
}
static ssize_t nvmet_subsys_attr_qid_max_store(struct config_item *item,
const char *page, size_t cnt)
{
struct nvmet_port *port = to_nvmet_port(item);
u16 qid_max;
if (nvmet_is_port_enabled(port, __func__))
return -EACCES;
if (sscanf(page, "%hu\n", &qid_max) != 1)
return -EINVAL;
if (qid_max < 1 || qid_max > NVMET_NR_QUEUES)
return -EINVAL;
down_write(&nvmet_config_sem);
to_subsys(item)->max_qid = qid_max;
up_write(&nvmet_config_sem);
return cnt;
}
CONFIGFS_ATTR(nvmet_subsys_, attr_qid_max);
static struct configfs_attribute *nvmet_subsys_attrs[] = {
&nvmet_subsys_attr_attr_allow_any_host,
&nvmet_subsys_attr_attr_version,
@ -1288,6 +1316,7 @@ static struct configfs_attribute *nvmet_subsys_attrs[] = {
&nvmet_subsys_attr_attr_cntlid_min,
&nvmet_subsys_attr_attr_cntlid_max,
&nvmet_subsys_attr_attr_model,
&nvmet_subsys_attr_attr_qid_max,
#ifdef CONFIG_BLK_DEV_INTEGRITY
&nvmet_subsys_attr_attr_pi_enable,
#endif