• James Smart's avatar
    [SCSI] scsi_netlink: Add transport and LLD recieve and event support · 22447be7
    James Smart authored
    This patch adds scsi netlink recieve and event support for transport
    and scsi LLDD's.  It is a reimplementation of the patch posted last
    week by David Somayajulu.
    There are a few things done differently:
    - Transport support is included
    - Event delivery is included
    - The vendor message is now its own unique message type, considered
      part of the generic "SCSI Transport".
    - LLDD entry points are now registered rather than included in the
      Background: When I started to implement the event handler via template,
      I had to either: muck up scsi_add_host and scsi_remove_host;  or have
      the event handler search all possible shosts. Neither was acceptable.
      Moving to a registration solves this, and also limits the scope of
      the changes to something that could be backported to a distro without
      breaking an already-released-distro kabi. However, I admit it isn't
      as elegant, as the passing of the LLDD host template in the
      registration and the complexity around dynamic add/remove shows.
    - The receive path was augmented to require a unique identifier for
      the LLDD before the message was allowed to be handed off to the
      driver. Given how quickly very fatal errors occur if there's msg
      mismatches (which I saw in testing my own tools :), I believe this
      to be a very good thing. The id plays off the vendor id scheme already
      introduced for the vendor unique event messages used by FC.
      Additionally, the id use as the basis of the registration/deregistration.
    - Send assist functions, for both the transport and LLDDs are included.
    [fujita.tomonori@lab.ntt.co.jp: fix missing cast]
    Signed-off-by: default avatarJames Smart <james.smart@emulex.com>
    Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
scsi_netlink.h 4.25 KB