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

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>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 1edcfaee6819e02d44f6eb51baaef0d43db69de6..3222359ac15b7745270c066b0a2de5eb19135024 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1835,6 +1835,8 @@ 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;