netdev - [PATCH] net: airoha_eth: increase max mtu to 9220 for DSA jumbo frames

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Message-ID: <20260115084837.52307-1-sayantann11@gmail.com>
Date: Thu, 15 Jan 2026 14:18:37 +0530
From: Sayantan Nandy <sayantann11@...il.com>
To: lorenzo@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	netdev@...r.kernel.org,
	sayantan.nandy@...oha.com,
	bread.hsu@...oha.com,
	kuldeep.malik@...oha.com,
	aniket.negi@...oha.com,
	rajeev.kumar@...oha.com,
	Sayantan Nandy <sayantann11@...il.com>
Subject: [PATCH] net: airoha_eth: increase max mtu to 9220 for DSA jumbo frames

The Industry standard for jumbo frame MTU is 9216 bytes. When using DSA
sub-system, an extra 4 byte tag is added to each frame. To allow users
to set the standard 9216-byte MTU via ifconfig,increase AIROHA_MAX_MTU
to 9220 bytes (9216+4).

Signed-off-by: Sayantan Nandy <sayantann11@...il.com>
---
 drivers/net/ethernet/airoha/airoha_eth.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.h b/drivers/net/ethernet/airoha/airoha_eth.h
index fbbc58133364..20e602d61e61 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.h
+++ b/drivers/net/ethernet/airoha/airoha_eth.h
@@ -21,7 +21,7 @@
 #define AIROHA_MAX_NUM_IRQ_BANKS	4
 #define AIROHA_MAX_DSA_PORTS		7
 #define AIROHA_MAX_NUM_RSTS		3
-#define AIROHA_MAX_MTU			9216
+#define AIROHA_MAX_MTU			9220
 #define AIROHA_MAX_PACKET_SIZE		2048
 #define AIROHA_NUM_QOS_CHANNELS		4
 #define AIROHA_NUM_QOS_QUEUES		8
-- 
2.43.0