[PATCH v2 4/4] nvme: Allow reauth from sysfs

[alistair23 at gmail.com]

From: Alistair Francis <alistair.francis at wdc.com>

Allow userspace to trigger a reauth (REPLACETLSPSK) from sysfs.
This can be done by writing to the sysfs file.

echo 0 > /sys/devices/virtual/nvme-fabrics/ctl/nvme0/tls_configured_key

Signed-off-by: Alistair Francis <alistair.francis at wdc.com>
---
v2:
 - Trigger on any value written to `tls_configured_key`

 drivers/nvme/host/sysfs.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/sysfs.c b/drivers/nvme/host/sysfs.c
index 6d10e12136d0..db1c53e00501 100644
--- a/drivers/nvme/host/sysfs.c
+++ b/drivers/nvme/host/sysfs.c
@@ -806,7 +806,28 @@ static ssize_t tls_configured_key_show(struct device *dev,
 
 	return sysfs_emit(buf, "%08x\n", key_serial(key));
 }
-static DEVICE_ATTR_RO(tls_configured_key);
+
+static ssize_t tls_configured_key_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+	int error;
+
+	if (!ctrl->opts || !ctrl->opts->concat)
+		return -EOPNOTSUPP;
+
+	error = nvme_auth_negotiate(ctrl, 0);
+	if (error < 0)
+		return error;
+
+	error = nvme_auth_wait(ctrl, 0);
+	if (error < 0)
+		return error;
+
+	return count;
+}
+static DEVICE_ATTR_RW(tls_configured_key);
 
 static ssize_t tls_keyring_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
-- 
2.51.1