From 6406fc709ace081575de2a8a7eee12e63d4c96c6 Mon Sep 17 00:00:00 2001 From: Sayantan Nandy Date: Mon, 19 Jan 2026 13:06:58 +0530 Subject: [PATCH] net: airoha_eth: increase max MTU to 9220 for DSA jumbo frames The industry standard jumbo frame MTU is 9216 bytes. When using the DSA subsystem, a 4-byte tag is added to each Ethernet frame. Increase AIROHA_MAX_MTU to 9220 bytes (9216 + 4) so that users can set a standard 9216-byte MTU on DSA ports. The underlying hardware supports significantly larger frame sizes (approximately 16K). However, the maximum MTU is limited to 9220 bytes for now, as this is sufficient to support standard jumbo frames and does not incur additional memory allocation overhead. Signed-off-by: Sayantan Nandy Reviewed-by: Andrew Lunn Acked-by: Lorenzo Bianconi Link: https://patch.msgid.link/20260119073658.6216-1-sayantann11@gmail.com Signed-off-by: Jakub Kicinski --- 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 fbbc58133364b..20e602d61e615 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 -- 2.47.3