[PATCH rdma-next v2 0/6] RDMA/irdma: Add support for ioctl

[David Hu <dhu@x6u.co>]

From: David Hu <xuehaohu@google.com>

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. Split CQ creation setup logic by umode and kmode into separate
   routines to be consistent with other queue creation logic.
5. Adds support for driver-specific shadow area UMEM attributes during CQ
   creation with CQ resize capability.
6. 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.

Changes in v2:
- Add patch 4/6 to split out setup logic from irdma_create_cq() into
  umode and kmode helpers (Leon).
- Rewrap commit messages to ~75 characters (Leon).
- Fix a pble/umem resource leak in irdma_resize_cq() (Sashiko).
- Link to v1: https://lore.kernel.org/all/20261011011022.1445352-1-dhu@x6u.co/

David Hu (6):
  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: Split CQ setup to umode and kmode
  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 | 574 +++++++++++++++++++++-------
 include/uapi/rdma/irdma-abi.h       |   5 +
 3 files changed, 444 insertions(+), 147 deletions(-)


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