[PATCH net 4/7] net/mlx5e: macsec: Track hardware object ownership for SA teardown

[Tariq Toukan <tariqt@nvidia.com>]

From: Cosmin Ratiu <cratiu@nvidia.com>

A driver MACsec SA can exist without a hardware MACsec object. Adding
an inactive RX SA or a TX SA while the SecY is non-operational creates
the encryption key but skips MACsec object creation. RX SA deactivation
also destroys the hardware object while retaining the driver SA and
its object ID.

TX SA deletion and the SA teardown performed by RX SC and SecY deletion
unconditionally destroy the hardware object. This can issue a destroy
command with an unallocated zero ID or an ID that has already been
destroyed and potentially reused. Failed RX SA activation can leave
the same stale-ID state after steering creation unwinds.

Track hardware object creation separately from SA activity. Set the
ownership flag after successful creation, clear it on destruction and
creation unwind, and check it before destroying the object during SA
cleanup. This preserves destruction of objects retained by inactive
TX SAs while avoiding destruction of unowned objects.

Fixes: 8ff0ac5be144 ("net/mlx5: Add MACsec offload Tx command support")
Fixes: aae3454e4d4c ("net/mlx5e: Add MACsec offload Rx command support")
Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
index daff53ba7d09..20eec345b36c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
@@ -58,6 +58,7 @@ struct mlx5e_macsec_async_work {
 
 struct mlx5e_macsec_sa {
 	bool active;
+	bool macsec_obj_created;
 	u8  assoc_num;
 	u32 macsec_obj_id;
 	u32 enc_key_id;
@@ -331,7 +332,10 @@ static void mlx5e_macsec_cleanup_sa(struct mlx5e_macsec *macsec,
 				    struct net_device *netdev, u32 fs_id)
 {
 	mlx5e_macsec_cleanup_sa_fs(macsec, sa, is_tx, netdev, fs_id);
-	mlx5e_macsec_destroy_object(macsec->mdev, sa->macsec_obj_id);
+	if (sa->macsec_obj_created) {
+		mlx5e_macsec_destroy_object(macsec->mdev, sa->macsec_obj_id);
+		sa->macsec_obj_created = false;
+	}
 }
 
 static int mlx5e_macsec_init_sa_fs(struct macsec_context *ctx,
@@ -396,6 +400,7 @@ static int mlx5e_macsec_init_sa(struct macsec_context *ctx,
 		if (err)
 			goto destroy_macsec_object;
 	}
+	sa->macsec_obj_created = true;
 
 	return 0;
 
-- 
2.44.0