net: ethernet: ti: am65-cpsw: Fix xdp_rxq error for disabled port

When an ethX port is disabled in the device tree, an error is returned
by xdp_rxq_info_reg() function while transitioning the CPSW device to
the up state. The message 'Missing net_device from driver' is output.

This patch fixes the issue by registering xdp_rxq info only if ethX
port is enabled (i.e. ndev pointer is not NULL).

Fixes: 8acacc4 ("net: ethernet: ti: am65-cpsw: Add minimal XDP support")
Link: https://lore.kernel.org/all/260d258f-87a1-4aac-8883-aab4746b32d8@ti.com/
Reported-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Closes: https://gist.github.com/Siddharth-Vadapalli-at-TI/5ed0e436606001c247a7da664f75edee
Signed-off-by: Julien Panis <jpanis@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: jpanisbl

drivers/net/ethernet/ti/am65-cpsw-nuss.c

@@ -391,6 +391,9 @@ static void am65_cpsw_destroy_xdp_rxqs(struct am65_cpsw_common *common)
 	int i;
 
 	for (i = 0; i < common->port_num; i++) {
+		if (!common->ports[i].ndev)
+			continue;
+
 		rxq = &common->ports[i].xdp_rxq;
 
 		if (xdp_rxq_info_is_reg(rxq))
@@ -426,6 +429,9 @@ static int am65_cpsw_create_xdp_rxqs(struct am65_cpsw_common *common)
 	rx_chn->page_pool = pool;
 
 	for (i = 0; i < common->port_num; i++) {
+		if (!common->ports[i].ndev)
+			continue;
+
 		rxq = &common->ports[i].xdp_rxq;
 
 		ret = xdp_rxq_info_reg(rxq, common->ports[i].ndev, i, 0);