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
