From: Eli Cohen <eli@dev.mellanox.co.il>
Date: Thu, 30 Jan 2014 11:49:48 +0000 (+0200)
Subject: IB/mlx5: Fix binary compatibility with libmlx5
X-Git-Tag: v3.14-rc3~24^2^6~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78c0f98cc9dd46824fa66f35f14ea24ba733d145;p=pandora-kernel.git

IB/mlx5: Fix binary compatibility with libmlx5

Commit c1be5232d21d ("Fix micro UAR allocator") broke binary compatibility
between libmlx5 and mlx5_ib since it defines a different value to the number
of micro UARs per page, leading to wrong calculation in libmlx5. This patch
defines struct mlx5_ib_alloc_ucontext_req_v2 as an extension to struct
mlx5_ib_alloc_ucontext_req.  The extended size is determined in mlx5_ib_alloc_ucontext()
and in case of old library we use uuarn 0 which works fine -- this is
acheived due to create_user_qp() falling back from high to medium then to
low class where low class will return 0.  For new libraries we use the
more sophisticated allocation algorithm.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
---

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