IB/mlx5: Fix micro UAR allocator

The micro UAR (uuar) allocator had a bug which resulted from the fact
that in each UAR we only have two micro UARs avaialable, those at
index 0 and 1.  This patch defines iterators to aid in traversing the
list of available micro UARs when allocating a uuar.

In addition, change the logic in create_user_qp() so that if high
class allocation fails (high class means lower latency), we revert to
medium class and not to the low class.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index da78875807fc..2c1c62e339ca 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -104,9 +104,10 @@ enum {
 };
 
 enum {
-        MLX5_BF_REGS_PER_PAGE   = 4,
-        MLX5_MAX_UAR_PAGES      = 1 << 8,
-        MLX5_MAX_UUARS          = MLX5_MAX_UAR_PAGES * MLX5_BF_REGS_PER_PAGE,
+        MLX5_BF_REGS_PER_PAGE           = 4,
+        MLX5_MAX_UAR_PAGES              = 1 << 8,
+        MLX5_NON_FP_BF_REGS_PER_PAGE    = 2,
+        MLX5_MAX_UUARS  = MLX5_MAX_UAR_PAGES * MLX5_NON_FP_BF_REGS_PER_PAGE,
 };
 
 enum {