linux-kernel - [PATCH v4 for-next 0/3] IB/core: Obtaining subnet

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Message-Id: <20210616065213.987-1-anand.a.khoje@oracle.com>
Date:   Wed, 16 Jun 2021 12:22:10 +0530
From:   Anand Khoje <anand.a.khoje@...cle.com>
To:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     dledford@...hat.com, jgg@...pe.ca, haakon.bugge@...cle.com,
        leon@...nel.org
Subject: [PATCH v4 for-next 0/3] IB/core: Obtaining subnet_prefix from cache in

This v4 patch series is used to read the port_attribute subnet_prefix
from a valid cache entry instead of having to call
device->ops.query_gid() in Infiniband link-layer devices. This requires
addition of a flag used to check that the cache entry is initialized and
that a valid value is being read.

1. Removed the port validity check from ib_get_cached_subnet_prefix.
This check was not useful as the port_num is always valid.

2. Shuffled locks pkey_lost_lock and netdev_lock in struct ib_port_data.
This was done as output of pahole showed two 4-byte holes in the
structure ib_port_data after pkey_list_lock and netdev_lock. Moving
netdev_lock shaved off 8 bytes from the structure.

3. Added a flag to struct ib_port_data. This is used to validate the
status of cached subnet_prefix. This valid cache entry of subnet_prefix
is used in function __ib_query_port().
This allows the utilization of the cache entry and hence avoids a call
into device->ops.query_gid(). We also ensure that in the event of a
cache update, the value for subnet_prefix gets read from the newly updated
GID cache and not via ib_query_port(), so that we do not end up reading a
stale cache value.

Anand Khoje (3):
  IB/core: Removed port validity check from ib_get_cached_subnet_prefix
  IB/core: Shuffle locks in ib_port_data to save memory
  IB/core: Obtain subnet_prefix from cache in IB devices

 drivers/infiniband/core/cache.c     | 25 ++++++++++++++++---------
 drivers/infiniband/core/core_priv.h |  2 +-
 drivers/infiniband/core/device.c    | 20 +++++++++++---------
 drivers/infiniband/core/security.c  |  7 ++-----
 include/rdma/ib_cache.h             |  5 +++++
 include/rdma/ib_verbs.h             |  6 +++++-
 6 files changed, 40 insertions(+), 25 deletions(-)

-- 
1.8.3.1