[PATCH net-next v7 19/19] net/mlx5e: Implement PSP key_rotate operation

[Daniel Zahka <daniel.zahka@gmail.com>]

From: Raed Salem <raeds@nvidia.com>

Implement .key_rotate operation where when invoked will cause the HW to use
a new master key to derive PSP spi/key pairs with complience with PSP spec.

Signed-off-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Signed-off-by: Daniel Zahka <daniel.zahka@gmail.com>
---

Notes:
    v1:
    - https://lore.kernel.org/netdev/20240510030435.120935-16-kuba@kernel.org/

 .../net/ethernet/mellanox/mlx5/core/en_accel/psp.c    | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c
index 56f39f452bc8..406fe351cd28 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c
@@ -82,11 +82,22 @@ static void mlx5e_psp_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)
 	atomic_dec(&psp->tx_key_cnt);
 }
 
+static int mlx5e_psp_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *exack)
+{
+	struct mlx5e_priv *priv = netdev_priv(psd->main_netdev);
+
+	/* no support for protecting against external rotations */
+	psd->generation = 0;
+
+	return mlx5e_psp_rotate_key(priv->mdev);
+}
+
 static struct psp_dev_ops mlx5_psp_ops = {
 	.set_config   = mlx5e_psp_set_config,
 	.rx_spi_alloc = mlx5e_psp_rx_spi_alloc,
 	.tx_key_add   = mlx5e_psp_assoc_add,
 	.tx_key_del   = mlx5e_psp_assoc_del,
+	.key_rotate   = mlx5e_psp_key_rotate,
 };
 
 void mlx5e_psp_unregister(struct mlx5e_priv *priv)
-- 
2.47.3