[PATCH v3 0/4] Support PSK reauthentication (REPLACETLSPSK)

[alistair23 at gmail.com]

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

Allow userspace on the host to trigger a reauth (REPLACETLSPSK) from
sysfs. This will replace the PSK for the admin queue when using
a secure concat connection.

This can be done by writing 0 to the `tls_configured_key` sysfs file,
for example something like this

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

`tls_configured_key` will only appear for concat connections as that is
all that is supported.

Reading `tls_configured_key` will return the current configured key, which
changes after each REPLACETLSPSK operation.

This series also include some fixes for the NVMe target code to ensure
this works against a Linux NVMe target.

v3:
 - Only trigger if a 0 is written to `tls_configured_key`
 - Add documentation

Alistair Francis (4):
  nvmet-tcp: Don't error if TLS is enabed on a reset
  nvmet-tcp: Don't free SQ on authentication success
  nvme: Expose the tls_configured sysfs for secure concat connections
  nvme: Allow reauth from sysfs

 Documentation/ABI/testing/sysfs-nvme   | 13 ++++++++++
 drivers/nvme/host/sysfs.c              | 36 ++++++++++++++++++++++++--
 drivers/nvme/target/auth.c             |  4 +--
 drivers/nvme/target/core.c             |  2 +-
 drivers/nvme/target/fabrics-cmd-auth.c | 12 ++++-----
 drivers/nvme/target/nvmet.h            |  4 +--
 6 files changed, 58 insertions(+), 13 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-nvme

-- 
2.51.1