[PATCH AUTOSEL 4.19 243/671] net/mlx5: Fix multiple updates of steering rules in parallel

Sasha Levin
2020-01-16T17:04:15Z

From: Eli Britstein <elibr@mellanox.com>

[ Upstream commit 6237634d8fcc65c9e3348382910e7cdb15084c68 ]

There might be a condition where the fte found is not active yet. In
this case we should not use it, but continue to search for another, or
allocate a new one.

Fixes: bd71b08ec2ee ("net/mlx5: Support multiple updates of steering rules in parallel")
Signed-off-by: Eli Britstein <elibr@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/mellanox/mlx5/core/fs_core.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
index 82a53317285d..b16e0f45d28c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -469,6 +469,7 @@ static void del_hw_fte(struct fs_node *node)
mlx5_core_warn(dev,
"flow steering can't delete fte in index %d of flow group id %d\n",
fte->index, fg->id);
+ node->active = 0;
}
}

@@ -1597,6 +1598,11 @@ lookup_fte_locked(struct mlx5_flow_group *g,
fte_tmp = NULL;
goto out;
}
+ if (!fte_tmp->node.active) {
+ tree_put_node(&fte_tmp->node);
+ fte_tmp = NULL;
+ goto out;
+ }

nested_down_write_ref_node(&fte_tmp->node, FS_LOCK_CHILD);
out:
--
2.20.1