Re: [PATCH net-next v5 6/8] net: bcmgenet: pad transmit frames out of the packet ready window

[Jakub Kicinski]

On Tue, 13 Oct 2026 16:20:35 +0200 Nicolai Buchwitz wrote:
> A frame that ends a few bytes past the transmit packet ready threshold
> stops the transmitter as soon as a shorter frame follows. Tx DMA then
> refuses to halt, so every later bcmgenet_init_dma() fails and the interface
> cannot be opened again. IP fragmentation generates that pattern on every
> datagram, full frames and a short tail.

This is really odd. Sounds like the IP can't really support high MTU
properly. Should the user be somehow informed that the driver will
append out-of-spec bytes to their frames or better still opt into
this hack?