+static void airoha_fe_maccr_init(struct airoha_eth *eth)
+{

...

+	airoha_fe_wr(eth, REG_FE_VIP_PATN(11), 0xc057); /* PPP->IPv6CP (0xc057) */

include/uapi/linux/ppp_defs.h
#define PPP_IPV6CP      0x8057  /* IPv6 Control Protocol */

Are these the same thing? Why is there one bit difference?

+	airoha_fe_wr(eth, REG_FE_VIP_PATN(17), 0x1ae0);
+	airoha_fe_wr(eth, REG_FE_VIP_EN(17),
+		     PATN_FCPU_EN_MASK | PATN_SP_EN_MASK |
+		     FIELD_PREP(PATN_TYPE_MASK, 3) | PATN_EN_MASK);
+
+	airoha_fe_wr(eth, REG_FE_VIP_PATN(18), 0x1ae00000);
+	airoha_fe_wr(eth, REG_FE_VIP_EN(18),
+		     PATN_FCPU_EN_MASK | PATN_DP_EN_MASK |
+		     FIELD_PREP(PATN_TYPE_MASK, 3) | PATN_EN_MASK);

+	airoha_fe_wr(eth, REG_FE_VIP_PATN(22), 0xaaaa);

Please add a comment what these match.

+static int airoha_dev_change_mtu(struct net_device *dev, int new_mtu)
+{
+	dev->mtu = new_mtu;
+
+	return 0;
+}
+

I don't think this is needed. Look at __dev_set_mtu().

    Andrew

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pw-bot: cr