[PATCH rdma-next 0/5] RDMA/irdma: Add support for ioctl

[David Hu]

From: David Hu <xuehaohu@xxxxxxxxxx>

Hello,

This patch series introduces support for uverbs ioctl queue creation
(QP, CQ, and SRQ) in the irdma driver. This series makes progress towards
modernizing irdma. This enables 1-step queue creation from pinned UMEMs
and shared dma-buf heaps (system_cc_shared), providing RDMA support for
Confidential Computing (CoCo) guest environments where memory encryption
otherwise prevents standard host-VA-based queues from operating.

Historically, irdma relied on legacy write() commands for queue setup.
This series modernizes irdma's queue creation path by adopting the ioctl
infrastructure:

1. Plumbs uverbs_attr_bundle into the irdma QP and SRQ creation routines.
2. Registers irdma's UVERBS ioctl namespace definition for QP, CQ, and SRQ.
3. Implements 1-step queue buffer creation for QP, CQ, and SRQ using
   UVERBS_ATTR_CREATE_*_BUF_UMEM attributes and ib_umem_get_attr(),
   configuring hardware Page Buffer Lists (PBLs) directly from pinned umems.
4. Adds support for driver-specific shadow area UMEM attributes during CQ
   creation with CQ resize capability.
5. Preserves backward compatibility with legacy 2-step write() path
   registrations when UMEM attributes are not provided.

User space rdma-core PR: https://github.com/linux-rdma/rdma-core/pull/1766

Testing:
Verified with rc_pingpong, srq_pingpong, and dmabuf_pingpong over irdma
devices in Confidential VM environments.

David Hu (5):
  RDMA/irdma: Plumb uverbs_attr_bundle for QP, SRQ
  RDMA/irdma: Register irdma UVERBS ioctl namespace
  RDMA/irdma: Support UMEM attribute for QP creation
  RDMA/irdma: Support UMEM attribute for CQ creation
  RDMA/irdma: Support UMEM attribute for SRQ creation

 drivers/infiniband/hw/irdma/utils.c |  12 +-
 drivers/infiniband/hw/irdma/verbs.c | 347 ++++++++++++++++++++++++----
 include/uapi/rdma/irdma-abi.h       |   5 +
 3 files changed, 314 insertions(+), 50 deletions(-)


base-commit: d2c08575500145dc5cb55075cd9b177626531613
-- 
2.56.0.385.gd3acb90ef8-goog