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nvme: expose hostnqn via sysfs for fabrics controllers

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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: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Sagi Grimberg 2020-02-07 17:13:53 -08:00 committed by Keith Busch
parent 43cc66892e
commit 76171c6cdf
1 changed files with 13 additions and 0 deletions
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13
drivers/nvme/host/core.c
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@ -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;
}