net: fec: Call swap_buffer() prior to IP header alignment

Commit 3ac72b7b63d5 ("net: fec: align IP header in hardware") breaks
networking on mx28.

There is an erratum on mx28 (ENGR121613 - ENET big endian mode
not compatible with ARM little endian) that requires an additional
byte-swap operation to workaround this problem.

So call swap_buffer() prior to performing the IP header alignment
to restore network functionality on mx28.

Fixes: 3ac72b7b63d5 ("net: fec: align IP header in hardware")
Reported-and-tested-by: Henri Roosen <henri.roosen@ginzinger.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 48a033e..5aa9d4d 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1430,14 +1430,14 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
                skb_put(skb, pkt_len - 4);
                data = skb->data;
 
+               if (!is_copybreak && need_swap)
+                       swap_buffer(data, pkt_len);
+
 #if !defined(CONFIG_M5272)
                if (fep->quirks & FEC_QUIRK_HAS_RACC)
                        data = skb_pull_inline(skb, 2);
 #endif
 
-               if (!is_copybreak && need_swap)
-                       swap_buffer(data, pkt_len);
-
                /* Extract the enhanced buffer descriptor */
                ebdp = NULL;
                if (fep->bufdesc_ex)