[PATCH 0/5] nvmet/nvmet_fc: add events for discovery controller rescan

[jsmart2021@gmail.com (James Smart)]

A transport may have a transport-specific mechanism that can signal
when discovery controller content has changed and request a host
to reconnect to the discovery controller.

FC is such a transport. RSCNs may be generated by the FC port with
the discovery server, with the RSCNs then broadcast to the FC-NVME
hosts. A host, upon receiving the RSCN, would validate connectivity
then initiate a discovery controller rescan, allowing new subsystems
to be connected to or updating subsystem connectivity tables.

These patches:
- Modify the nvmet core layer to call a transport callback on every
  subsystem add or remove from a transport port.
- Modify the nvmet-fc transport to support the callback, and add its
  own internal lldd api to generate RSCN's via the lldd.
- Modify the lpfc driver to send/receive RSCNs for FC-NVME: transmit
  the changed attribute RSCN on the target, receiving the RSCN on
  the initiator and invoking the nvmet-fc transport rescan api.
  Also adds manual sysfs mechanism to generate the RSCN on the target.


Dick Kennedy (1):
  lpfc: Add sysfs interface to post NVME RSCN

James Smart (4):
  nvmet: call transport on subsystem add and delete
  nvmet_fc: support transport subsystem events
  lpfc: Add support to generate RSCN events for nport
  lpfc: Add NVME rescan support via RSCNs

 drivers/nvme/target/configfs.c   |   2 +
 drivers/nvme/target/core.c       |  10 ++++
 drivers/nvme/target/fc.c         |  10 ++++
 drivers/nvme/target/nvmet.h      |   2 +
 drivers/scsi/lpfc/lpfc.h         |   2 +
 drivers/scsi/lpfc/lpfc_attr.c    |  62 ++++++++++++++++++++
 drivers/scsi/lpfc/lpfc_crtn.h    |   4 ++
 drivers/scsi/lpfc/lpfc_els.c     | 118 +++++++++++++++++++++++++++++++++++++++
 drivers/scsi/lpfc/lpfc_hbadisc.c |  35 ++++++++++++
 drivers/scsi/lpfc/lpfc_hw.h      |   9 +++
 drivers/scsi/lpfc/lpfc_nvme.c    |  42 ++++++++++++++
 drivers/scsi/lpfc/lpfc_nvmet.c   |  18 ++++++
 drivers/scsi/lpfc/lpfc_sli.c     |   1 +
 include/linux/nvme-fc-driver.h   |   6 ++
 14 files changed, 321 insertions(+)

-- 
2.13.1