tree 7b95ec9a1573125cd4113bb87f72c54a62064f47
parent 7cf5b7882184ecb347903e9480667ee977946ddd
author Daniel Jurgens <danielj@mellanox.com> 1477575401 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1480150493 +0100

IB/mlx5: Use cache line size to select CQE stride

commit 16b0e0695a73b68d8ca40288c8f9614ef208917b upstream.

When creating kernel CQs use 128B CQE stride if the
cache line size is 128B, 64B otherwise.  This prevents
multiple CQEs from residing in a 128B cache line,
which can cause retries when there are concurrent
read and writes in one cache line.

Tested with IPoIB on PPC64, saw ~5% throughput
improvement.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>