diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index e33dfc0165f610cb940fd9d792ae2e5cb041ce91..a02a5f4a02949c3f8dbf38849391ce30b3715097 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -474,11 +474,19 @@ static void rxq_refill(struct rx_queue *rxq)
 		/*
 		 * Reserve 2+14 bytes for an ethernet header (the
 		 * hardware automatically prepends 2 bytes of dummy
-		 * data to each received packet), 4 bytes for a VLAN
-		 * header, and 4 bytes for the trailing FCS -- 24
-		 * bytes total.
+		 * data to each received packet), 16 bytes for up to
+		 * four VLAN tags, and 4 bytes for the trailing FCS
+		 * -- 36 bytes total.
 		 */
-		skb_size = mp->dev->mtu + 24;
+		skb_size = mp->dev->mtu + 36;
+
+		/*
+		 * Make sure that the skb size is a multiple of 8
+		 * bytes, as the lower three bits of the receive
+		 * descriptor's buffer size field are ignored by
+		 * the hardware.
+		 */
+		skb_size = (skb_size + 7) & ~7;
 
 		skb = dev_alloc_skb(skb_size + dma_get_cache_alignment() - 1);
 		if (skb == NULL)
@@ -552,7 +560,7 @@ static int rxq_process(struct rx_queue *rxq, int budget)
 		spin_unlock_irqrestore(&mp->lock, flags);
 
 		dma_unmap_single(NULL, rx_desc->buf_ptr + 2,
-				 mp->dev->mtu + 24, DMA_FROM_DEVICE);
+				 rx_desc->buf_size, DMA_FROM_DEVICE);
 		rxq->rx_desc_count--;
 		rx++;