[PATCH rdma-next 0/5] IB service resolution

[Leon Romanovsky <leon@kernel.org>]

From: Leon Romanovsky <leonro@nvidia.com>

From Mark,

This patchset adds support to resolve IB service records from SM. With
this feature, the user-space is able to resolve and query IB address
information like DGID and PKEY based on an IB service name or ID,
through new ucma commands.

New CM states:
 * RDMA_CM_ADDRINFO_QUERY - Indicates cm is in the process of IB service
   resolution;
 * RDMA_CM_ADDRINFO_RESOLVED - Indicates cm has finished the process of
   IB service resolution.

New CM events:
 * RDMA_CM_EVENT_ADDRINFO_RESOLVED - Indicates successful resolution of
   address information.
 * RDMA_CM_EVENT_ADDRINFO_ERROR - Indicates a failure in address
   information resolution.

The patchset also enables writing custom events into the CM. This is
particularly useful for applications that require events not typically
generated in the standard rdmacm flow. Two new event types are
supported:

 * RDMA_CM_EVENT_USER - A user-defined event, where the event details
   are specified by the application and not interpreted by the librdmacm
   library.
 * RDMA_CM_EVENT_INTERNAL - An internal event, used and consumed exclusively
   by the librdmacm library.

For instance, the new user-space API rdma_resolve_addrinfo() will
support both SA (Service Agent) and DNS resolution. In the DNS case,
since there is no standard CM event generated upon completion, an
RDMA_CM_EVENT_INTERNAL event with "ADDRINFO_RESOLVED" information as the
parameter can be written into the CM. This allows the librdmacm library
to receive the event and report an ADDRINFO_RESOLVED event to the user,
ensuring that DNS resolution follows the same workflow as IB service
record resolution.

Thanks

Mark Zhang (5):
  RDMA/sa_query: Add RMPP support for SA queries
  RDMA/sa_query: Support IB service records resolution
  RDMA/cma: Support IB service record resolution
  RDMA/ucma: Support query resolved service records
  RDMA/ucma: Support write an event into a CM

 drivers/infiniband/core/cma.c      | 136 +++++++++++++-
 drivers/infiniband/core/cma_priv.h |   4 +-
 drivers/infiniband/core/sa_query.c | 277 +++++++++++++++++++++++++++--
 drivers/infiniband/core/ucma.c     | 120 ++++++++++++-
 include/rdma/ib_mad.h              |   1 +
 include/rdma/ib_sa.h               |  37 ++++
 include/rdma/rdma_cm.h             |  21 ++-
 include/uapi/rdma/ib_user_sa.h     |  14 ++
 include/uapi/rdma/rdma_user_cm.h   |  42 ++++-
 9 files changed, 634 insertions(+), 18 deletions(-)

-- 
2.50.0