[PATCH net 5/7] net/mlx5e: macsec: Delete remaining SecYs during cleanup

[Tariq Toukan <tariqt@nvidia.com>]

From: Cosmin Ratiu <cratiu@nvidia.com>

Suspend invokes MACsec cleanup without unregistering the netdev, so
offloaded SecYs may still exist. Cleanup frees their owning context
without deleting them, leaking driver state, encryption keys, MACsec
objects and steering resources.

This change deletes all remaining SecYs, which releases all HW objects
and avoids leaks.

But this only fixes resource teardown. On resume, the macsec driver may
still potentially have a lot of state it considers offloaded, but the
resumed device will have a clean slate. Fixing that is outside the scope
of this patch.

Fixes: 3fd3fb6b6b88 ("net/mlx5e: Move MACsec initialization from profile init stage to profile enable stage")
Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 .../mellanox/mlx5/core/en_accel/macsec.c      | 53 ++++++++++++-------
 1 file changed, 35 insertions(+), 18 deletions(-)

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 20eec345b36c..84ce388d3846 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
@@ -1238,33 +1238,21 @@ static int mlx5e_macsec_upd_secy(struct macsec_context *ctx)
 	return err;
 }
 
-static int mlx5e_macsec_del_secy(struct macsec_context *ctx)
+static void macsec_del_secy(struct mlx5e_macsec *macsec,
+			    struct mlx5e_macsec_device *macsec_device)
 {
-	struct mlx5e_priv *priv = macsec_netdev_priv(ctx->netdev);
-	struct mlx5e_macsec_device *macsec_device;
+	struct net_device *netdev = (struct net_device *)macsec_device->netdev;
 	struct mlx5e_macsec_rx_sc *rx_sc, *tmp;
 	struct mlx5e_macsec_sa *tx_sa;
-	struct mlx5e_macsec *macsec;
 	struct list_head *list;
-	int err = 0;
 	int i;
 
-	mutex_lock(&priv->macsec->lock);
-	macsec = priv->macsec;
-	macsec_device = mlx5e_macsec_get_macsec_device_context(macsec, ctx);
-	if (!macsec_device) {
-		netdev_err(ctx->netdev, "MACsec offload: Failed to find device context\n");
-		err = -EINVAL;
-
-		goto out;
-	}
-
 	for (i = 0; i < MACSEC_NUM_AN; ++i) {
 		tx_sa = macsec_device->tx_sa[i];
 		if (!tx_sa)
 			continue;
 
-		mlx5e_macsec_cleanup_sa(macsec, tx_sa, true, ctx->secy->netdev, 0);
+		mlx5e_macsec_cleanup_sa(macsec, tx_sa, true, netdev, 0);
 		mlx5_destroy_encryption_key(macsec->mdev, tx_sa->enc_key_id);
 		kfree(tx_sa);
 		macsec_device->tx_sa[i] = NULL;
@@ -1272,7 +1260,7 @@ static int mlx5e_macsec_del_secy(struct macsec_context *ctx)
 
 	list = &macsec_device->macsec_rx_sc_list_head;
 	list_for_each_entry_safe(rx_sc, tmp, list, rx_sc_list_element)
-		macsec_del_rxsc_ctx(macsec, rx_sc, ctx->secy->netdev);
+		macsec_del_rxsc_ctx(macsec, rx_sc, netdev);
 
 	kfree(macsec_device->dev_addr);
 	macsec_device->dev_addr = NULL;
@@ -1280,7 +1268,24 @@ static int mlx5e_macsec_del_secy(struct macsec_context *ctx)
 	list_del_rcu(&macsec_device->macsec_device_list_element);
 	--macsec->num_of_devices;
 	kfree(macsec_device);
+}
+
+static int mlx5e_macsec_del_secy(struct macsec_context *ctx)
+{
+	struct mlx5e_priv *priv = macsec_netdev_priv(ctx->netdev);
+	struct mlx5e_macsec *macsec = priv->macsec;
+	struct mlx5e_macsec_device *macsec_device;
+	int err = 0;
 
+	mutex_lock(&macsec->lock);
+	macsec_device = mlx5e_macsec_get_macsec_device_context(macsec, ctx);
+	if (!macsec_device) {
+		netdev_err(ctx->netdev, "MACsec offload: Failed to find device context\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	macsec_del_secy(macsec, macsec_device);
 out:
 	mutex_unlock(&macsec->lock);
 
@@ -1796,6 +1801,7 @@ int mlx5e_macsec_init(struct mlx5e_priv *priv)
 
 void mlx5e_macsec_cleanup(struct mlx5e_priv *priv)
 {
+	struct mlx5e_macsec_device *macsec_device, *tmp;
 	struct mlx5e_macsec *macsec = priv->macsec;
 	struct mlx5_core_dev *mdev = priv->mdev;
 
@@ -1803,9 +1809,20 @@ void mlx5e_macsec_cleanup(struct mlx5e_priv *priv)
 		return;
 
 	mlx5_notifier_unregister(mdev, &macsec->nb);
-	mlx5_macsec_fs_cleanup(mdev->macsec_fs);
 	destroy_workqueue(macsec->wq);
+
+	mutex_lock(&macsec->lock);
+	list_for_each_entry_safe(macsec_device, tmp,
+				 &macsec->macsec_device_list_head,
+				 macsec_device_list_element)
+		macsec_del_secy(macsec, macsec_device);
+	mutex_unlock(&macsec->lock);
+
+	xa_destroy(&macsec->sc_xarray);
+	mlx5_macsec_fs_cleanup(mdev->macsec_fs);
+	mdev->macsec_fs = NULL;
 	mlx5e_macsec_aso_cleanup(&macsec->aso, mdev);
 	mutex_destroy(&macsec->lock);
 	kfree(macsec);
+	priv->macsec = NULL;
 }
-- 
2.44.0