net: bgmac: rate limit RX error messages

When the RX ring is full the RX FIFO overflows. With RX overflow
continue enabled, the DMA engine then writes one frame with a bogus
length (always 0x45c2 on a BCM4716), which the driver drops with
"Found oversized packet at slot %d, DMA issue!".

Under sustained overload this happens on every NAPI poll. On an Asus
RT-N16 a 950 Mbit/s UDP stream to the router printed about 1450 such
lines in 20 seconds. The messages are printed from NAPI context, so
with a serial console the router spends most of its time printing.

The frames are already accounted in rx_length_errors and rx_errors.
Rate limit both RX error messages. With this change the same flood
printed 60 lines while rx_length_errors counted 14297 dropped frames.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://patch.msgid.link/20261018231629.39734-1-rosenp@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions