[RESEND,v1,rdma-next,0/3] IWPM support for no port mapping

Message

Steve Wise Jan. 17, 2019, 8:31 p.m. UTC

(resend with proper threading)

A soft iwarp driver that uses the host TCP stack via a kernel mode
socket does not need port mapping.  In fact, if the port map daemon,
iwpmd, is running, then iwpmd must not try and create/bind a socket to
the actual port for a soft iwarp connection, since the driver already
has that socket bound.

Yet if the soft iwarp driver wants to interoperate with hard iwarp
devices that -are- using port mapping, then the soft iwarp driver's
mappings still need to be maintained and advertised by the iwpm protocol.

This patch enhances the rdma driver<->iwcm interface to allow an
iwarp driver to specify that it does not want port mapping.  The iwpm
kernel<->iwpmd interface is also enhanced to pass up this information
on map requests.

Care is taken to interoperate with the current iwpmd version (ABI version
3) and only use the new NL attributes if iwpmd supports ABI version 4.

The ABI version define has also been created in rdma_netlink.h so both
kernel and user code can share it.  The iwcm and iwpmd negotiate the
ABI version to use with a new HELLO netlink message.

This patch series can also be viewed at:

https://github.com/larrystevenwise/linux/tree/topic/no-port-map-v1

The corresponding rdma-core changes are at:

https://github.com/larrystevenwise/rdma-core/tree/wip/no-port-map

I will submit the rdma-core series soon for review.

Changes since rfc:

- removed the sysfs abi_version file, replaced with inband abi_version
negotiation via a new HELLO message.

Steve Wise (3):
  iw_cxgb*: kzalloc the iwcm verbs struct
  RDMA/IWPM: refactor the IWPM message attribute names
  RDMA/IWPM: Support no port mapping requirements

 drivers/infiniband/core/iwcm.c              |   7 +-
 drivers/infiniband/core/iwpm_msg.c          | 115 +++++++++++++++++++++++-----
 drivers/infiniband/core/iwpm_util.c         |  48 +++++++++++-
 drivers/infiniband/core/iwpm_util.h         |  12 +++
 drivers/infiniband/hw/cxgb3/iwch_provider.c |   2 +-
 drivers/infiniband/hw/cxgb4/provider.c      |   2 +-
 include/rdma/iw_cm.h                        |  13 ++++
 include/rdma/iw_portmap.h                   |  15 +++-
 include/uapi/rdma/rdma_netlink.h            |  45 ++++++++++-
 9 files changed, 230 insertions(+), 29 deletions(-)