[PATCH 06/11] nvme: Implement In-Band authentication

[Christoph Hellwig]

On Wed, Jun 08, 2022 at 04:45:13PM +0200, Hannes Reinecke wrote:
> Implement NVMe-oF In-Band authentication according to NVMe TPAR 8006.
> This patch adds two new fabric options 'dhchap_secret' to specify the
> pre-shared key (in ASCII respresentation according to NVMe 2.0 section
> 8.13.5.8 'Secret representation') and 'dhchap_ctrl_secret' to specify
> the pre-shared controller key for bi-directional authentication of both
> the host and the controller.
> Re-authentication can be triggered by writing the PSK into the new
> controller sysfs attribute 'dhchap_secret' or 'dhchap_ctrl_secret'.

The Kconfig doesn't apply due to the new nvme-apple driver.

Also when I fix it up manually Kconfig and sparse are both not
happy:

WARNING: unmet direct dependencies detected for CRYPTO_DH_RFC7919_GROUPS
  Depends on [n]: CRYPTO [=y] && CRYPTO_DH [=n]
  Selected by [y]:
  - NVME_AUTH [=y] && NVME_CORE [=y]

i.e. when you select something you also need to select its dependencies

sparse also isn't exactly happy with the series:

rivers/nvme/host/core.c:3667:1: warning: symbol 'dev_attr_dhchap_secret' was not declared. Should it be static?
drivers/nvme/host/core.c:3717:1: warning: symbol 'dev_attr_dhchap_ctrl_secret' was not declared. Should it be static?

drivers/nvme/target/fabrics-cmd-auth.c:33:30: warning: invalid assignment: |=
drivers/nvme/target/fabrics-cmd-auth.c:33:30:    left side has type restricted __le32
drivers/nvme/target/fabrics-cmd-auth.c:33:30:    right side has type int
drivers/nvme/target/fabrics-cmd-auth.c:118:22: warning: cast to restricted __le32
drivers/nvme/target/fabrics-cmd-auth.c:118:22: warning: cast from restricted __le16
drivers/nvme/target/fabrics-cmd-auth.c:389:30: warning: incorrect type in assignment (different base types)
drivers/nvme/target/fabrics-cmd-auth.c:389:30:    expected restricted __le16 [usertype] dhvlen
drivers/nvme/target/fabrics-cmd-auth.c:389:30:    got restricted __le32 [usertype]