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nvme: expose reconnect_delay and ctrl_loss_tmo via sysfs

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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: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sagi Grimberg 2020-07-05 00:57:55 -07:00 committed by Christoph Hellwig
parent 240e6ee272
commit 764075fdcb
1 changed files with 62 additions and 0 deletions
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62
drivers/nvme/host/core.c
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@ -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
};