[dpdk-dev] [PATCH] net/mlx5: fix doorbell release on Rx queue release

[Dekel Peled <dekelp@mellanox.com>]

Function mlx5_rxq_release() calls mlx5_release_dbr() to release the
doorbell allocated for this Rx queue.
This call is relevant only for Rx queue objects created using
DevX API.

This patch adds the required check, to call mlx5_release_dbr()
only when relevant.
It also updates mlx5_release_dbr() to use the input offset correctly.

Fixes: 69abf7b1db4a ("net/mlx5: create advanced RxQ using new API")

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
---
 drivers/net/mlx5/mlx5.c      | 1 +
 drivers/net/mlx5/mlx5_rxq.c  | 6 ++++--
 drivers/net/mlx5/mlx5_rxtx.h | 1 +
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 973c80a..8f9693c 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -1460,6 +1460,7 @@ struct mlx5_dev_spawn_data {
 		rte_free(page);
 	} else {
 		/* Mark in bitmap that this door-bell is not in use. */
+		offset /= MLX5_DBR_SIZE;
 		int i = offset / 64;
 		int j = offset % 64;
 
diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index b225055..c9df8b0 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -1242,6 +1242,7 @@ struct mlx5_rxq_obj *
 			goto error;
 		rxq_ctrl->dbr_offset = dbr_offset;
 		rxq_ctrl->dbr_umem_id = dbr_page->umem->umem_id;
+		rxq_ctrl->dbr_umem_id_valid = 1;
 		rxq_data->rq_db = (uint32_t *)((uintptr_t)dbr_page->dbrs +
 					       (uintptr_t)rxq_ctrl->dbr_offset);
 	}
@@ -1829,8 +1830,9 @@ struct mlx5_rxq_ctrl *
 	if (rxq_ctrl->obj && !mlx5_rxq_obj_release(rxq_ctrl->obj))
 		rxq_ctrl->obj = NULL;
 	if (rte_atomic32_dec_and_test(&rxq_ctrl->refcnt)) {
-		claim_zero(mlx5_release_dbr(dev, rxq_ctrl->dbr_umem_id,
-					    rxq_ctrl->dbr_offset));
+		if (rxq_ctrl->dbr_umem_id_valid)
+			claim_zero(mlx5_release_dbr(dev, rxq_ctrl->dbr_umem_id,
+						    rxq_ctrl->dbr_offset));
 		mlx5_mr_btree_free(&rxq_ctrl->rxq.mr_ctrl.cache_bh);
 		LIST_REMOVE(rxq_ctrl, next);
 		rte_free(rxq_ctrl);
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index 928d6c3..60d871c 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -184,6 +184,7 @@ struct mlx5_rxq_ctrl {
 	struct mlx5_priv *priv; /* Back pointer to private data. */
 	unsigned int socket; /* CPU socket ID for allocations. */
 	unsigned int irq:1; /* Whether IRQ is enabled. */
+	unsigned int dbr_umem_id_valid:1; /* dbr_umem_id holds a valid value. */
 	uint32_t flow_mark_n; /* Number of Mark/Flag flows using this Queue. */
 	uint32_t flow_tunnels_n[MLX5_FLOW_TUNNEL]; /* Tunnels counters. */
 	uint32_t wqn; /* WQ number. */
-- 
1.8.3.1