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| author | Vlastimil Setka <setka@vsis.cz> | 2015-04-29 00:17:11 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-04-29 15:19:34 -0400 |
| commit | 48734994ac268eb391a66dca4cde7d08a08aba08 (patch) | |
| tree | 0d121b78c92a711a9144282e23ad7d0f61eca1b2 /drivers/net/ethernet/altera/altera_tse_main.c | |
| parent | 42eab005a5dd5d7ea2b0328aecc4d6cc0c23c9c2 (diff) | |
| download | linux-48734994ac268eb391a66dca4cde7d08a08aba08.tar.gz linux-48734994ac268eb391a66dca4cde7d08a08aba08.tar.bz2 linux-48734994ac268eb391a66dca4cde7d08a08aba08.zip | |
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>
Diffstat (limited to 'drivers/net/ethernet/altera/altera_tse_main.c')
| -rw-r--r-- | drivers/net/ethernet/altera/altera_tse_main.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/ethernet/altera/altera_tse_main.c b/drivers/net/ethernet/altera/altera_tse_main.c index 0533c051a3e5..da48e66377b5 100644 --- a/drivers/net/ethernet/altera/altera_tse_main.c +++ b/drivers/net/ethernet/altera/altera_tse_main.c @@ -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; |