From: Yonatan Nachum <ynachum@amazon.com>
To: <jgg@nvidia.com>, <leon@kernel.org>, <linux-rdma@vger.kernel.org>
Cc: <mrgolin@amazon.com>, <sleybo@amazon.com>, <matua@amazon.com>,
<gal.pressman@linux.dev>, Yonatan Nachum <ynachum@amazon.com>
Subject: [PATCH for-next 0/2] RDMA/efa: Add AH cache for AH reuse
Date: Sun, 10 May 2026 08:30:33 +0000 [thread overview]
Message-ID: <20260510083035.458081-1-ynachum@amazon.com> (raw)
New EFA devices don't support the creation of multiple AHs to the same
remote on the same PD. To overcome this limitation, introduce an AH
cache that manages AH reuse transparently.
The cache uses an rhashtable keyed by (PD, GID) to track active address
handles with refcounts. On create AH, the driver returns an existing AH
number if one is already cached, or creates a new one and caches it. On
destroy AH, the driver only issues the device destroy command when the
last reference is dropped.
A per-entry mutex serializes concurrent device commands on the same
cache entry, preventing create-before-destroy races on the device.
Yonatan Nachum (2):
RDMA/efa: Add initialization of AH cache rhashtable
RDMA/efa: Add AH cache handling on create and destroy AH
drivers/infiniband/hw/efa/Makefile | 4 +-
drivers/infiniband/hw/efa/efa_ah_cache.c | 154 +++++++++++++++++++++++
drivers/infiniband/hw/efa/efa_ah_cache.h | 41 ++++++
drivers/infiniband/hw/efa/efa_com.c | 12 +-
drivers/infiniband/hw/efa/efa_com.h | 5 +-
drivers/infiniband/hw/efa/efa_com_cmd.c | 27 ++++
drivers/infiniband/hw/efa/efa_com_cmd.h | 1 +
drivers/infiniband/hw/efa/efa_verbs.c | 9 +-
8 files changed, 245 insertions(+), 8 deletions(-)
create mode 100644 drivers/infiniband/hw/efa/efa_ah_cache.c
create mode 100644 drivers/infiniband/hw/efa/efa_ah_cache.h
--
2.50.1
next reply other threads:[~2026-05-10 8:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-10 8:30 Yonatan Nachum [this message]
2026-05-10 8:30 ` [PATCH for-next 1/2] RDMA/efa: Add initialization of AH cache rhashtable Yonatan Nachum
2026-05-10 8:30 ` [PATCH for-next 2/2] RDMA/efa: Add AH cache handling on create and destroy AH Yonatan Nachum
2026-05-11 8:00 ` Gal Pressman
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