linux/drivers/infiniband
Parav Pandit b150c3862d IB/core: Introduce GID entry reference counts
In order to be able to expose pointers to the ib_gid_attrs in the GID
table we need to make it so the value of the pointer cannot be
changed. Thus each GID table entry gets a unique piece of kref'd memory
that is written only during initialization and remains constant for its
lifetime.

This eventually will allow the struct ib_gid_attrs to be returned without
copy from many of query the APIs, but it also provides a way to track when
all users of a HW table index go away.

For roce we no longer allow an in-use HW table index to be re-used for a
new an different entry. When a GID table entry needs to be removed it is
hidden from the find API, but remains as a valid HW index and all
ib_gid_attr points remain valid. The HW index is not relased until all
users put the kref.

Later patches will broadly replace the use of the sgid_index integer with
the kref'd structure.

Ultimately this will prevent security problems where the OS changes the
properties of a HW GID table entry while an active user object is still
using the entry.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-18 11:09:05 -06:00
..
core IB/core: Introduce GID entry reference counts 2018-06-18 11:09:05 -06:00
hw treewide: Use array_size() in kvzalloc_node() 2018-06-12 16:19:22 -07:00
sw treewide: Use array_size() in vzalloc_node() 2018-06-12 16:19:22 -07:00
ulp treewide: Use array_size() in vzalloc() 2018-06-12 16:19:22 -07:00
Kconfig RDMA/ucm: Mark UCM interface as BROKEN 2018-05-24 09:39:25 -06:00
Makefile