xfrm: Use xdo.dev instead of xdo.real_dev

The policy offload struct was reused from the state offload and
real_dev was copied from dev, but it was never set to anything else.
Simplify the code by always using xdo.dev for policies.

Signed-off-by: Cosmin Ratiu <[email protected]>
Reviewed-by: Leon Romanovsky <[email protected]>
Reviewed-by: Nikolay Aleksandrov <[email protected]>
Signed-off-by: Steffen Klassert <[email protected]>

Author: Cosmin Ratiu

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c

@@ -1164,7 +1164,7 @@ mlx5e_ipsec_build_accel_pol_attrs(struct mlx5e_ipsec_pol_entry *pol_entry,
 static int mlx5e_xfrm_add_policy(struct xfrm_policy *x,
 				 struct netlink_ext_ack *extack)
 {
-	struct net_device *netdev = x->xdo.real_dev;
+	struct net_device *netdev = x->xdo.dev;
 	struct mlx5e_ipsec_pol_entry *pol_entry;
 	struct mlx5e_priv *priv;
 	int err;

net/xfrm/xfrm_device.c

@@ -378,7 +378,6 @@ int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
 
 	xdo->dev = dev;
 	netdev_tracker_alloc(dev, &xdo->dev_tracker, GFP_ATOMIC);
-	xdo->real_dev = dev;
 	xdo->type = XFRM_DEV_OFFLOAD_PACKET;
 	switch (dir) {
 	case XFRM_POLICY_IN:
@@ -400,7 +399,6 @@ int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
 	err = dev->xfrmdev_ops->xdo_dev_policy_add(xp, extack);
 	if (err) {
 		xdo->dev = NULL;
-		xdo->real_dev = NULL;
 		xdo->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
 		xdo->dir = 0;
 		netdev_put(dev, &xdo->dev_tracker);

net/xfrm/xfrm_state.c

@@ -1555,15 +1555,13 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 			xso->type = XFRM_DEV_OFFLOAD_PACKET;
 			xso->dir = xdo->dir;
 			xso->dev = xdo->dev;
-			xso->real_dev = xdo->real_dev;
 			xso->flags = XFRM_DEV_OFFLOAD_FLAG_ACQ;
 			netdev_hold(xso->dev, &xso->dev_tracker, GFP_ATOMIC);
 			error = xso->dev->xfrmdev_ops->xdo_dev_state_add(x, NULL);
 			if (error) {
 				xso->dir = 0;
 				netdev_put(xso->dev, &xso->dev_tracker);
 				xso->dev = NULL;
-				xso->real_dev = NULL;
 				xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
 				x->km.state = XFRM_STATE_DEAD;
 				to_put = x;