[openib-general] [RFC] [PATCH 1/3] RDMA CM: addrdma_get/set_optioncalls to get/set path records

[Sean Hefty]

>What about for IB HCAs? Are there a large number
>of options that have not yet been exposed but
>which are device independent and *might* be
>desirable to control? If not, then why introduce
>a "catchall" interface as opposed to specific
>interfaces that have to justified on a per
>method basis?

Sockets provides setsockopt/getsockopt calls, and there is an attempt here to
emulate sockets.  These calls provide a very simple way to extend functionality
without needing to modify the user to kernel transition code with every feature.

Functionality that I would like to add through these calls in the short term
include:

* Bind to a device based on IB specific addresses (e.g. GIDs).
* Getting usable path records between two nodes.
* Setting primary and alternate paths for a connection.
* Modify an alternate path for a connection.
* Joining a multicast group identified by an IP address.
* Leaving a multicast group identified by an IP address.
* Joining a multicast group identified by an MCMemberRecord.
* Leaving a multicast group identified by an MCMemberRecord.

- Sean