net: ravb: Fix max TX frame size for RZ/V2M

BugLink: https://bugs.launchpad.net/bugs/2107449

[ Upstream commit e7e441a4100e4bc90b52f80494a28a9667993975 ]

When tx_max_frame_size was added to struct ravb_hw_info, no value was
set in ravb_rzv2m_hw_info so the default value of zero was used.

The maximum MTU is set by subtracting from tx_max_frame_size to allow
space for headers and frame checksums. As ndev->max_mtu is unsigned,
this subtraction wraps around leading to a ridiculously large positive
value that is obviously incorrect.

Before tx_max_frame_size was introduced, the maximum MTU was based on
rx_max_frame_size. So, we can restore the correct maximum MTU by copying
the rx_max_frame_size value into tx_max_frame_size for RZ/V2M.

Fixes: 1d63864299ca ("net: ravb: Fix maximum TX frame size for GbEth devices")
Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://patch.msgid.link/20250109113706.1409149-1-paul.barker.ct@bp.renesas.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

This commit is contained in:

Paul Barker

2025-01-09 11:37:06 +00:00

committed by

Stefan Bader

parent 6c4b81cd9d

commit 17da067ec2

1 changed files with 1 additions and 0 deletions

									
										drivers/net/ethernet/renesas/ravb_main.c
									
		+1
		
												View File
												
				@@ -2495,6 +2495,7 @@ static const struct ravb_hw_info ravb_rzv2m_hw_info = {

					.stats_len = ARRAY_SIZE(ravb_gstrings_stats),

					.max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1,

					.tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,

					.tx_max_frame_size = SZ_2K,

					.rx_max_frame_size = SZ_2K,

					.multi_irqs = 1,

					.err_mgmt_irqs = 1,