Commit 48734994 authored Apr 29, 2015 by Vlastimil Setka Committed by David S. Miller Apr 29, 2015

altera_tse: Correct rx packet length

Altera TSE MAC rx DMA transfer starts with the 2 additional bytes for IP
payload alignment. This patch fixes tse_rx() function loop which reads DMA
rx status and extracts packet length from it. Status signalises a whole DMA
transfer length, which is 2 bytes longer than the packet itself.

Signed-off-by: Vlastimil Setka <setka@vsis.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 42eab005

drivers/net/ethernet/altera/altera_tse_main.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -391,6 +391,12 @@ static int tse_rx(struct altera_tse_private *priv, int limit)
		"RCV pktstatus %08X pktlength %08X\n",
		pktstatus, pktlength);

		/* DMA trasfer from TSE starts with 2 aditional bytes for
		* IP payload alignment. Status returned by get_rx_status()
		* contains DMA transfer length. Packet is 2 bytes shorter.
		*/
		pktlength -= 2;

		count++;
		next_entry = (++priv->rx_cons) % priv->rx_ring_size;