Commit 932ce980 authored by Wei Fang's avatar Wei Fang Committed by Jakub Kicinski
Browse files

net: enetc: add loopback support for i.MX95 ENETC PF 



Add internal loopback support for i.MX95 ENETC PF, the default loopback
mode is MAC level loopback, the MAC Tx data is looped back onto the Rx.
The MAC interface runs at a fixed 1:8 ratio of NETC clock in MAC-level
loopback mode, with no dependency on Tx clock.

Signed-off-by: default avatarWei Fang <wei.fang@nxp.com>
Reviewed-by: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20250506080735.3444381-15-wei.fang@nxp.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent f7d30ef6

drivers/net/ethernet/freescale/enetc/enetc4_pf.c

+18 −0
Original line number Diff line number Diff line
@@ -101,6 +101,21 @@ static void enetc4_pf_set_si_mc_hash_filter(struct enetc_hw *hw, int si, 
	enetc_port_wr(hw, ENETC4_PSIMMHFR1(si), upper_32_bits(hash));

}



static void enetc4_pf_set_loopback(struct net_device *ndev, bool en)

{

	struct enetc_ndev_priv *priv = netdev_priv(ndev);

	struct enetc_si *si = priv->si;

	u32 val;



	val = enetc_port_mac_rd(si, ENETC4_PM_CMD_CFG(0));

	val = u32_replace_bits(val, en ? 1 : 0, PM_CMD_CFG_LOOP_EN);

	/* Default to select MAC level loopback mode if loopback is enabled. */

	val = u32_replace_bits(val, en ? LPBCK_MODE_MAC_LEVEL : 0,

			       PM_CMD_CFG_LPBK_MODE);



	enetc_port_mac_wr(si, ENETC4_PM_CMD_CFG(0), val);

}



static void enetc4_pf_clear_maft_entries(struct enetc_pf *pf)

{

	int i;
@@ -536,6 +551,9 @@ static int enetc4_pf_set_features(struct net_device *ndev, 
		enetc4_pf_set_si_vlan_promisc(hw, 0, promisc_en);

	}



	if (changed & NETIF_F_LOOPBACK)

		enetc4_pf_set_loopback(ndev, !!(features & NETIF_F_LOOPBACK));



	enetc_set_features(ndev, features);



	return 0;

drivers/net/ethernet/freescale/enetc/enetc_pf_common.c

+1 −3
Original line number Diff line number Diff line
@@ -134,10 +134,8 @@ void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev, 
	}



	/* TODO: currently, i.MX95 ENETC driver does not support advanced features */

	if (!is_enetc_rev1(si)) {

		ndev->hw_features &= ~NETIF_F_LOOPBACK;

	if (!is_enetc_rev1(si))

		goto end;

	}



	ndev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |

			     NETDEV_XDP_ACT_NDO_XMIT | NETDEV_XDP_ACT_RX_SG |