Commit 76171c6c authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Keith Busch
Browse files

nvme: expose hostnqn via sysfs for fabrics controllers 



We allow userspace to connect with a custom hostnqn which is useful for
certain use-cases. However there is no way to tell what is the hostnqn
used to connect to a given controller.

Expose this so userspace can correlate controllers based on hostnqn.

Signed-off-by: default avatarSagi Grimberg <sagi@grimberg.me>
Reviewed-by: default avatarChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
parent 43cc6689

drivers/nvme/host/core.c

+13 −0
Original line number Diff line number Diff line
@@ -3242,6 +3242,16 @@ static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev, 
}

static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);



static ssize_t nvme_sysfs_show_hostnqn(struct device *dev,

					struct device_attribute *attr,

					char *buf)

{

	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);



	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->opts->host->nqn);

}

static DEVICE_ATTR(hostnqn, S_IRUGO, nvme_sysfs_show_hostnqn, NULL);



static ssize_t nvme_sysfs_show_address(struct device *dev,

					 struct device_attribute *attr,

					 char *buf)
@@ -3267,6 +3277,7 @@ static struct attribute *nvme_dev_attrs[] = { 
	&dev_attr_numa_node.attr,

	&dev_attr_queue_count.attr,

	&dev_attr_sqsize.attr,

	&dev_attr_hostnqn.attr,

	NULL

};
@@ -3280,6 +3291,8 @@ static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj, 
		return 0;

	if (a == &dev_attr_address.attr && !ctrl->ops->get_address)

		return 0;

	if (a == &dev_attr_hostnqn.attr && !ctrl->opts)

		return 0;



	return a->mode;

}

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