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-rw-r--r--drivers/net/mv643xx_eth.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index e33dfc0165f..a02a5f4a029 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++;