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Subject[PATCH rdma-next v1 0/7] Introduce UAPIs to query UCONTEXT, PD and MR properties
From: Leon Romanovsky <>

* Replaced "KABI" word with "UAPI".
* Set IOVA as an optional attribute upon query MR.

From Yishai,

This series introduce UAPIs to query existing UCONTEXT, PD and MR for
their properties.

By those UAPIs a user space application which owns the command FD of the
device can retrieve and rebuild the above objects despite that it wasn't
their creator. As of that, PDs and MRs can be shared by any process who
owns the command FD of their creator.

This functionality enables to utilize and optimize some application
flows, few examples below.

Any solution which is a single business logic based on multi-process
design needs this. Example include NGINX, with TCP load balancing, sharing the
RSS indirection table with RQ per process. HPC frameworks with multi-rank
(process) solution on single hosts. UCX can share IB resources using the shared
PD and can help dispatch data to multiple processes/MR's in single RDMA
operation. Also, there are use cases when a primary processes registered a large
shared memory range, and each worker process spawned will create a private QP
on the shared PD, and use the shared MR to save the registration time

The matching verbs APIs were introduced in the mailing list by the below RFC [1].

In addition, the series enables CQ ioctl commands by default as this
functionality is fully mature for a long time and sets IOVA on IB MR in
the uverbs layer to let all drivers have it.



Yishai Hadas (7):
IB/uverbs: Enable CQ ioctl commands by default
IB/uverbs: Set IOVA on IB MR in uverbs layer
IB/uverbs: Expose UAPI to query ucontext
RDMA/mlx5: Refactor mlx5_ib_alloc_ucontext() response
RDMA/mlx5: Implement the query ucontext functionality
RDMA/mlx5: Introduce UAPI to query PD attributes
IB/uverbs: Expose UAPI to query MR

drivers/infiniband/Kconfig | 8 -
drivers/infiniband/core/device.c | 1 +
drivers/infiniband/core/uverbs_cmd.c | 4 +
drivers/infiniband/core/uverbs_ioctl.c | 1 +
drivers/infiniband/core/uverbs_std_types_cq.c | 3 -
.../infiniband/core/uverbs_std_types_device.c | 41 +++-
drivers/infiniband/core/uverbs_std_types_mr.c | 52 +++-
drivers/infiniband/hw/cxgb4/mem.c | 1 -
drivers/infiniband/hw/mlx4/mr.c | 1 -
drivers/infiniband/hw/mlx5/Makefile | 3 +-
drivers/infiniband/hw/mlx5/main.c | 232 ++++++++++--------
drivers/infiniband/hw/mlx5/mlx5_ib.h | 2 +
drivers/infiniband/hw/mlx5/std_types.c | 45 ++++
include/rdma/ib_verbs.h | 4 +
include/uapi/rdma/ib_user_ioctl_cmds.h | 15 ++
include/uapi/rdma/mlx5_user_ioctl_cmds.h | 14 ++
16 files changed, 308 insertions(+), 119 deletions(-)
create mode 100644 drivers/infiniband/hw/mlx5/std_types.c


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