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IB/mlx5: Fix retrieval of index to first hi class bfreg

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First the function retrieving the index of the first hi latency class
blue flame register. High latency class bfregs are located right above
medium latency class bfregs.

Fixes: c1be5232d2 ('IB/mlx5: Fix micro UAR allocator')
Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Eli Cohen 2017-01-03 23:55:22 +02:00 committed by Leon Romanovsky
parent 2f5ff26478
commit 0b80c14f00
1 changed files with 14 additions and 10 deletions
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24
drivers/infiniband/hw/mlx5/qp.c
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@ -490,12 +490,21 @@ static int next_bfreg(int n)
return n;
}
enum {
/* this is the first blue flame register in the array of bfregs assigned
* to a processes. Since we do not use it for blue flame but rather
* regular 64 bit doorbells, we do not need a lock for maintaiing
* "odd/even" order
*/
NUM_NON_BLUE_FLAME_BFREGS = 1,
};
static int num_med_bfreg(struct mlx5_bfreg_info *bfregi)
{
int n;
n = bfregi->num_uars * MLX5_NON_FP_BFREGS_PER_UAR -
bfregi->num_low_latency_bfregs - 1;
bfregi->num_low_latency_bfregs - NUM_NON_BLUE_FLAME_BFREGS;
return n >= 0 ? n : 0;
}
@ -508,17 +517,9 @@ static int max_bfregi(struct mlx5_bfreg_info *bfregi)
static int first_hi_bfreg(struct mlx5_bfreg_info *bfregi)
{
int med;
int i;
int t;
med = num_med_bfreg(bfregi);
for (t = 0, i = first_med_bfreg();; i = next_bfreg(i)) {
t++;
if (t == med)
return next_bfreg(i);
}
return 0;
return next_bfreg(med);
}
static int alloc_high_class_bfreg(struct mlx5_bfreg_info *bfregi)
@ -544,6 +545,8 @@ static int alloc_med_class_bfreg(struct mlx5_bfreg_info *bfregi)
for (i = first_med_bfreg(); i < first_hi_bfreg(bfregi); i = next_bfreg(i)) {
if (bfregi->count[i] < bfregi->count[minidx])
minidx = i;
if (!bfregi->count[minidx])
break;
}
bfregi->count[minidx]++;
@ -558,6 +561,7 @@ static int alloc_bfreg(struct mlx5_bfreg_info *bfregi,
mutex_lock(&bfregi->lock);
switch (lat) {
case MLX5_IB_LATENCY_CLASS_LOW:
BUILD_BUG_ON(NUM_NON_BLUE_FLAME_BFREGS != 1);
bfregn = 0;
bfregi->count[bfregn]++;
break;