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charset="utf-8" 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: Wei Fang Reviewed-by: Vladimir Oltean --- .../net/ethernet/freescale/enetc/enetc4_pf.c | 18 ++++++++++++++++++ .../ethernet/freescale/enetc/enetc_pf_common.c | 4 +--- 2 files changed, 19 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c b/drivers/net= /ethernet/freescale/enetc/enetc4_pf.c index 1f6500f12bbb..c16378eb50bc 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c +++ b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c @@ -101,6 +101,21 @@ static void enetc4_pf_set_si_mc_hash_filter(struct ene= tc_hw *hw, int si, enetc_port_wr(hw, ENETC4_PSIMMHFR1(si), upper_32_bits(hash)); } =20 +static void enetc4_pf_set_loopback(struct net_device *ndev, bool en) +{ + struct enetc_ndev_priv *priv =3D netdev_priv(ndev); + struct enetc_si *si =3D priv->si; + u32 val; + + val =3D enetc_port_mac_rd(si, ENETC4_PM_CMD_CFG(0)); + val =3D u32_replace_bits(val, en ? 1 : 0, PM_CMD_CFG_LOOP_EN); + /* Default to select MAC level loopback mode if loopback is enabled. */ + val =3D 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 *nd= ev, enetc4_pf_set_si_vlan_promisc(hw, 0, promisc_en); } =20 + if (changed & NETIF_F_LOOPBACK) + enetc4_pf_set_loopback(ndev, !!(features & NETIF_F_LOOPBACK)); + enetc_set_features(ndev, features); =20 return 0; diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c b/drive= rs/net/ethernet/freescale/enetc/enetc_pf_common.c index 8c563e552021..edf14a95cab7 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c @@ -134,10 +134,8 @@ void enetc_pf_netdev_setup(struct enetc_si *si, struct= net_device *ndev, } =20 /* TODO: currently, i.MX95 ENETC driver does not support advanced feature= s */ - if (!is_enetc_rev1(si)) { - ndev->hw_features &=3D ~NETIF_F_LOOPBACK; + if (!is_enetc_rev1(si)) goto end; - } =20 ndev->xdp_features =3D NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT | NETDEV_XDP_ACT_NDO_XMIT | NETDEV_XDP_ACT_RX_SG | --=20 2.34.1