net: fec: dynamically set the NETDEV_XDP_ACT_NDO_XMIT feature of XDP

When a XDP program is installed or uninstalled, fec_restart() will
be invoked to reset MAC and buffer descriptor rings. It's reasonable
not to transmit any packet during the process of reset. However, the
NETDEV_XDP_ACT_NDO_XMIT bit of xdp_features is enabled by default,
that is to say, it's possible that the fec_enet_xdp_xmit() will be
invoked even if the process of reset is not finished. In this case,
the redirected XDP frames might be dropped and available transmit BDs
may be incorrectly deemed insufficient. So this patch disable the
NETDEV_XDP_ACT_NDO_XMIT feature by default and dynamically configure
this feature when the bpf program is installed or uninstalled.

Fixes: e4ac7cc6 ("net: fec: turn on XDP features")
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/freescale/fec_main.c

@@ -3732,12 +3732,18 @@ static int fec_enet_bpf(struct net_device *dev, struct netdev_bpf *bpf)
 		if (fep->quirks & FEC_QUIRK_SWAP_FRAME)
 			return -EOPNOTSUPP;
 
+		if (!bpf->prog)
+			xdp_features_clear_redirect_target(dev);
+
 		if (is_run) {
 			napi_disable(&fep->napi);
 			netif_tx_disable(dev);
 		}
 
 		old_prog = xchg(&fep->xdp_prog, bpf->prog);
+		if (old_prog)
+			bpf_prog_put(old_prog);
+
 		fec_restart(dev);
 
 		if (is_run) {
@@ -3745,8 +3751,8 @@ static int fec_enet_bpf(struct net_device *dev, struct netdev_bpf *bpf)
 			netif_tx_start_all_queues(dev);
 		}
 
-		if (old_prog)
-			bpf_prog_put(old_prog);
+		if (bpf->prog)
+			xdp_features_set_redirect_target(dev, false);
 
 		return 0;
 
@@ -4016,8 +4022,7 @@ static int fec_enet_init(struct net_device *ndev)
 
 	if (!(fep->quirks & FEC_QUIRK_SWAP_FRAME))
 		ndev->xdp_features = NETDEV_XDP_ACT_BASIC |
-				     NETDEV_XDP_ACT_REDIRECT |
-				     NETDEV_XDP_ACT_NDO_XMIT;
+				     NETDEV_XDP_ACT_REDIRECT;
 
 	fec_restart(ndev);