[PATCH rdma-next 0/6] RDMA/mana_ib: Implement RNIC CQs

Konstantin Taranov
2024-04-18T16:52:11Z

From: Konstantin Taranov <kotaranov@microsoft.com>

This patch series implements creation and destruction of CQs
which can be used with RC QPs.

Patches with RC QPs will be sent in the next patch series.

To create a CQ for RNIC, mana_ib requires creation of EQs
within mana_ib device. An EQ of mana ethernet cannot be used.

To make the implementation of create_cq cleaner, this series
also introduces minor changes to mana_cq structure (cqe->buf_size)
and adds a helper to remove CQ callbacks.

Mana ethernet and mana_ib CQs are different entities which are
created in different isolation zones (ethernet vs rnic).
As a result, RNIC cannot use ethenet CQs and ethernet cannot
use RNIC CQs.
That is why, we use existing udata request for creation of
ethernet CQs. If the request has extra fields, then we create
an RNIC CQ. The kernel-level CQs will be RNIC CQs (in future
patches).

To preserve backward and forward compatibility with RDMA-CORE,
we will make the following changes to mana provider in RDMA-CORE:

The rdma-core will request RNIC CQs by default, with the proposed
request format.
If the mana has installed an allocator with manadv_set_context_attr,
then the rdma-core undestands that this is a DPDK use-case and
requests an ethernet CQ, using old short request format.

Konstantin Taranov (6):
RDMA/mana_ib: create EQs for RNIC CQs
RDMA/mana_ib: create and destroy RNIC cqs
RDMA/mana_ib: replace duplicate cqe with buf_size
RDMA/mana_ib: introduce a helper to remove cq callbacks
RDMA/mana_ib: boundary check before installing cq callbacks
RDMA/mana_ib: implement uapi for creation of rnic cq

drivers/infiniband/hw/mana/cq.c | 77 ++++++++++++++++++++----
drivers/infiniband/hw/mana/main.c | 88 +++++++++++++++++++++++++++-
drivers/infiniband/hw/mana/mana_ib.h | 36 +++++++++++-
drivers/infiniband/hw/mana/qp.c | 30 ++--------
include/uapi/rdma/mana-abi.h | 7 +++
5 files changed, 200 insertions(+), 38 deletions(-)

--
2.43.0