Commit 626851e9 authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Christoph Hellwig
Browse files

nvmet: make discovery NQN configurable 



TPAR8013 allows for unique discovery NQNs, so make the discovery
controller NQN configurable by exposing a subsys attribute
'discovery_nqn'.

Signed-off-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarChaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: default avatarHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent c7d792f9

drivers/nvme/target/configfs.c

+39 −0
Original line number Diff line number Diff line
@@ -1233,6 +1233,44 @@ static ssize_t nvmet_subsys_attr_model_store(struct config_item *item, 
}

CONFIGFS_ATTR(nvmet_subsys_, attr_model);



static ssize_t nvmet_subsys_attr_discovery_nqn_show(struct config_item *item,

			char *page)

{

	return snprintf(page, PAGE_SIZE, "%s\n",

			nvmet_disc_subsys->subsysnqn);

}



static ssize_t nvmet_subsys_attr_discovery_nqn_store(struct config_item *item,

			const char *page, size_t count)

{

	struct nvmet_subsys *subsys = to_subsys(item);

	char *subsysnqn;

	int len;



	len = strcspn(page, "\n");

	if (!len)

		return -EINVAL;



	subsysnqn = kmemdup_nul(page, len, GFP_KERNEL);

	if (!subsysnqn)

		return -ENOMEM;



	/*

	 * The discovery NQN must be different from subsystem NQN.

	 */

	if (!strcmp(subsysnqn, subsys->subsysnqn)) {

		kfree(subsysnqn);

		return -EBUSY;

	}

	down_write(&nvmet_config_sem);

	kfree(nvmet_disc_subsys->subsysnqn);

	nvmet_disc_subsys->subsysnqn = subsysnqn;

	up_write(&nvmet_config_sem);



	return count;

}

CONFIGFS_ATTR(nvmet_subsys_, attr_discovery_nqn);



#ifdef CONFIG_BLK_DEV_INTEGRITY

static ssize_t nvmet_subsys_attr_pi_enable_show(struct config_item *item,

						char *page)
@@ -1262,6 +1300,7 @@ 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_discovery_nqn,

#ifdef CONFIG_BLK_DEV_INTEGRITY

	&nvmet_subsys_attr_attr_pi_enable,

#endif

drivers/nvme/target/core.c

+2 −1
Original line number Diff line number Diff line
@@ -1493,7 +1493,8 @@ static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port, 
	if (!port)

		return NULL;



	if (!strcmp(NVME_DISC_SUBSYS_NAME, subsysnqn)) {

	if (!strcmp(NVME_DISC_SUBSYS_NAME, subsysnqn) ||

	    !strcmp(nvmet_disc_subsys->subsysnqn, subsysnqn)) {

		if (!kref_get_unless_zero(&nvmet_disc_subsys->ref))

			return NULL;

		return nvmet_disc_subsys;