linux-kernel - [PATCH v6 net-next 3/6] net: fec: update MAX

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Message-ID: <20250908161755.608704-4-shenwei.wang@nxp.com>
Date: Mon,  8 Sep 2025 11:17:52 -0500
From: Shenwei Wang <shenwei.wang@....com>
To: Wei Fang <wei.fang@....com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>
Cc: Shenwei Wang <shenwei.wang@....com>,
	Clark Wang <xiaoning.wang@....com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	imx@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-imx@....com
Subject: [PATCH v6 net-next 3/6] net: fec: update MAX_FL based on the current MTU

Configure the MAX_FL (Maximum Frame Length) register according to the
current MTU value, which ensures that packets exceeding the configured MTU
trigger an RX error.

Signed-off-by: Shenwei Wang <shenwei.wang@....com>
---
 drivers/net/ethernet/freescale/fec_main.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 642e19187128..5b71c4cf86bc 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1147,9 +1147,8 @@ fec_restart(struct net_device *ndev)
 	u32 ecntl = FEC_ECR_ETHEREN;
 
 #ifdef OPT_ARCH_HAS_MAX_FL
-	rcntl |= fep->max_buf_size << 16;
+	rcntl |= (fep->netdev->mtu + ETH_HLEN + ETH_FCS_LEN) << 16;
 #endif
-
 	if (fep->bufdesc_ex)
 		fec_ptp_save_state(fep);
 
-- 
2.43.0