[dpdk-dev] [PATCH] net/mlx5: fix Rx descriptor status returned value

[Didier Pallard]

Two bugs in rx_queue_count function:
- One entry may contain several segments, so 'used' must be multiplied
  by number of segments per entry to properly reflect the queue usage.
- rx_queue_count returns the number of entries used in queue, so it ranges
  from 0 to max number of entries in queue, not this number minus
  one.

Fixes: 8788fec1f269 ("net/mlx5: implement descriptor status API")
Cc: sta...@dpdk.org
Signed-off-by: Didier Pallard <didier.pall...@6wind.com>
---
 drivers/net/mlx5/mlx5_rxtx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 5ac63da8039d..17f80c25443e 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -500,7 +500,7 @@ rx_queue_count(struct mlx5_rxq_data *rxq)
                used += n;
                cqe = &(*rxq->cqes)[cq_ci & cqe_cnt];
        }
-       used = RTE_MIN(used, (1U << rxq->elts_n) - 1);
+       used = RTE_MIN(used * (1 << rxq->sges_n), 1U << rxq->elts_n);
        return used;
 }
 
-- 
2.24.1