linux-kernel - [PATCH for-next v4 0/2] RDMA/rxe: Prefetching pages with explicit ODP

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Message-ID: <20250522111955.3227-1-dskmtsd@gmail.com>
Date: Thu, 22 May 2025 11:19:53 +0000
From: Daisuke Matsuda <dskmtsd@...il.com>
To: linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	leon@...nel.org,
	jgg@...pe.ca,
	zyjzyj2000@...il.com
Cc: Daisuke Matsuda <dskmtsd@...il.com>
Subject: [PATCH for-next v4 0/2] RDMA/rxe: Prefetching pages with explicit ODP

There is ibv_advise_mr(3) that can be used by applications to optimize
memory access. This series enables the feature on rxe driver, which has
already been available in mlx5.

There is a tiny change on the rdma-core util.
cf. https://github.com/linux-rdma/rdma-core/pull/1605

Currently, there are regressions in the for-next tree. When running ODP tests,
ib_uverbs and rxe can get stuck respectively. Therefore, to test this series,
please apply the patches to commit e56b4eab9cde ("RDMA/siw: Remove unused
siw_mem_add"). The regressions are under investigation.
cf. https://lore.kernel.org/linux-rdma/20250522083257.GM7435@unreal/T/#t

v2->v3:
  - Added return -EOPNOTSUPP; (1st patch)
  - Corrected type definitions mismatch (1st patch)

v3->v4:
  - merged rxe_init_prefetch_work() to rxe_ib_advise_mr_prefetch() (2nd patch)
  - Modified to use per-MR counter to ensure RXE is not destroyed while
    the asynchronous task is running  (2nd patch)

Daisuke Matsuda (2):
  RDMA/rxe: Implement synchronous prefetch for ODP MRs
  RDMA/rxe: Enable asynchronous prefetch for ODP MRs

 drivers/infiniband/sw/rxe/rxe.c     |   7 ++
 drivers/infiniband/sw/rxe/rxe_loc.h |  10 ++
 drivers/infiniband/sw/rxe/rxe_odp.c | 159 ++++++++++++++++++++++++++++
 3 files changed, 176 insertions(+)

-- 
2.43.0