Commit 764075fd authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Christoph Hellwig
Browse files

nvme: expose reconnect_delay and ctrl_loss_tmo via sysfs 



This is useful information, and moreover its it's useful to
be able to alter these parameters per controller after it
has been established.

Signed-off-by: default avatarSagi Grimberg <sagi@grimberg.me>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 240e6ee2

drivers/nvme/host/core.c

+62 −0
Original line number Diff line number Diff line
@@ -3535,6 +3535,66 @@ static ssize_t nvme_sysfs_show_address(struct device *dev, 
}

static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);



static ssize_t nvme_ctrl_loss_tmo_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	struct nvmf_ctrl_options *opts = ctrl->opts;



	if (ctrl->opts->max_reconnects == -1)

		return sprintf(buf, "off\n");

	return sprintf(buf, "%d\n",

			opts->max_reconnects * opts->reconnect_delay);

}



static ssize_t nvme_ctrl_loss_tmo_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t count)

{

	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	struct nvmf_ctrl_options *opts = ctrl->opts;

	int ctrl_loss_tmo, err;



	err = kstrtoint(buf, 10, &ctrl_loss_tmo);

	if (err)

		return -EINVAL;



	else if (ctrl_loss_tmo < 0)

		opts->max_reconnects = -1;

	else

		opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo,

						opts->reconnect_delay);

	return count;

}

static DEVICE_ATTR(ctrl_loss_tmo, S_IRUGO | S_IWUSR,

	nvme_ctrl_loss_tmo_show, nvme_ctrl_loss_tmo_store);



static ssize_t nvme_ctrl_reconnect_delay_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);



	if (ctrl->opts->reconnect_delay == -1)

		return sprintf(buf, "off\n");

	return sprintf(buf, "%d\n", ctrl->opts->reconnect_delay);

}



static ssize_t nvme_ctrl_reconnect_delay_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t count)

{

	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	unsigned int v;

	int err;



	err = kstrtou32(buf, 10, &v);

	if (err || v > UINT_MAX)

		return -EINVAL;



	ctrl->opts->reconnect_delay = v;

	return count;

}

static DEVICE_ATTR(reconnect_delay, S_IRUGO | S_IWUSR,

	nvme_ctrl_reconnect_delay_show, nvme_ctrl_reconnect_delay_store);



static struct attribute *nvme_dev_attrs[] = {

	&dev_attr_reset_controller.attr,

	&dev_attr_rescan_controller.attr,
@@ -3552,6 +3612,8 @@ static struct attribute *nvme_dev_attrs[] = { 
	&dev_attr_sqsize.attr,

	&dev_attr_hostnqn.attr,

	&dev_attr_hostid.attr,

	&dev_attr_ctrl_loss_tmo.attr,

	&dev_attr_reconnect_delay.attr,

	NULL

};

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