netdev - [PATCH net-next V4 05/11] net/mlx5: fs, retry insertion to hash table on EBUSY

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Message-ID: <20241219175841.1094544-6-tariqt@nvidia.com>
Date: Thu, 19 Dec 2024 19:58:35 +0200
From: Tariq Toukan <tariqt@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, "Andrew
 Lunn" <andrew+netdev@...n.ch>
CC: <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>, Gal Pressman
	<gal@...dia.com>, Leon Romanovsky <leonro@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, Przemek Kitszel <przemyslaw.kitszel@...el.com>, "Tariq
 Toukan" <tariqt@...dia.com>
Subject: [PATCH net-next V4 05/11] net/mlx5: fs, retry insertion to hash table on EBUSY

From: Mark Bloch <mbloch@...dia.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@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.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);
-- 
2.45.0