[PATCH net-next 06/12] net/mlx5: fs, retry insertion to hash table on EBUSY

[Tariq Toukan <tariqt@nvidia.com>]

From: Mark Bloch <mbloch@nvidia.com>

When inserting into an rhashtable faster than it can grow, an -EBUSY error
may be encountered. Modify the insertion logic to retry on -EBUSY until
either a successful insertion or a genuine error is returned.

Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
index f781f8f169b9..ae1a5705b26d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -821,11 +821,17 @@ static int insert_fte(struct mlx5_flow_group *fg, struct fs_fte *fte)
 		return index;
 
 	fte->index = index + fg->start_index;
+retry_insert:
 	ret = rhashtable_insert_fast(&fg->ftes_hash,
 				     &fte->hash,
 				     rhash_fte);
-	if (ret)
+	if (ret) {
+		if (ret == -EBUSY) {
+			cond_resched();
+			goto retry_insert;
+		}
 		goto err_ida_remove;
+	}
 
 	tree_add_node(&fte->node, &fg->node);
 	list_add_tail(&fte->node.list, &fg->node.children);
-- 
2.44.0