net: fec: correct rx_bytes statistic for the case SHIFT16 is set

[ Upstream commit ad17e7e92a7c52ce70bb764813fcf99464f96903 ]

Two additional bytes in front of each frame received into the RX FIFO if
SHIFT16 is set, so we need to subtract the extra two bytes from pkt_len
to correct the statistic of rx_bytes.

Fixes: 3ac72b7b63d5 ("net: fec: align IP header in hardware")
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20251106021421.2096585-1-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index adf1f2bbcbb16f27c486cfbb7ac95a81a36a521c..c404ca590b73cc304fd3ad1d27173ae197b8492f 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1820,6 +1820,8 @@ fec_enet_rx_queue(struct net_device *ndev, u16 queue_id, int budget)
                ndev->stats.rx_packets++;
                pkt_len = fec16_to_cpu(bdp->cbd_datlen);
                ndev->stats.rx_bytes += pkt_len;
+               if (fep->quirks & FEC_QUIRK_HAS_RACC)
+                       ndev->stats.rx_bytes -= 2;
 
                index = fec_enet_get_bd_index(bdp, &rxq->bd);
                page = rxq->rx_skb_info[index].page;