diff --cc drivers/net/ethernet/spacemit/k1_emac.c
index 40c9504b7444,b49c4708bf9e..dab0772c5b9d
--- a/drivers/net/ethernet/spacemit/k1_emac.c
+++ b/drivers/net/ethernet/spacemit/k1_emac.c
@@@ -193,7 -201,9 +194,7 @@@ static void emac_reset_hw(struct emac_p
  
  static void emac_init_hw(struct emac_priv *priv)
  {
- 	u32 rxirq = 0, dma = 0;
 -	/* Destination address for 802.3x Ethernet flow control */
 -	u8 fc_dest_addr[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x01 };
+ 	u32 rxirq = 0, dma = 0, frame_sz;
  
  	regmap_set_bits(priv->regmap_apmu,
  			priv->regmap_apmu_offset + APMU_EMAC_CTRL_REG,
@@@ -218,6 -228,21 +219,15 @@@
  		DEFAULT_TX_THRESHOLD);
  	emac_wr(priv, MAC_RECEIVE_PACKET_START_THRESHOLD, DEFAULT_RX_THRESHOLD);
  
+ 	/* Set maximum frame size and jabber size based on configured MTU,
+ 	 * accounting for Ethernet header, double VLAN tags, and FCS.
+ 	 */
+ 	frame_sz = priv->ndev->mtu + ETH_HLEN + 2 * VLAN_HLEN + ETH_FCS_LEN;
+ 
+ 	emac_wr(priv, MAC_MAXIMUM_FRAME_SIZE, frame_sz);
+ 	emac_wr(priv, MAC_TRANSMIT_JABBER_SIZE, frame_sz);
+ 	emac_wr(priv, MAC_RECEIVE_JABBER_SIZE, frame_sz);
+ 
 -	/* Configure flow control (enabled in emac_adjust_link() later) */
 -	emac_set_mac_addr_reg(priv, fc_dest_addr, MAC_FC_SOURCE_ADDRESS_HIGH);
 -	emac_wr(priv, MAC_FC_PAUSE_HIGH_THRESHOLD, DEFAULT_FC_FIFO_HIGH);
 -	emac_wr(priv, MAC_FC_HIGH_PAUSE_TIME, DEFAULT_FC_PAUSE_TIME);
 -	emac_wr(priv, MAC_FC_PAUSE_LOW_THRESHOLD, 0);
 -
  	/* RX IRQ mitigation */
  	rxirq = FIELD_PREP(MREGBIT_RECEIVE_IRQ_FRAME_COUNTER_MASK,
  			   EMAC_RX_FRAMES);