[PATCH v7] net/tap: Allow jumbo frames

[Francesco Mancino]

Thank you for the feedback. 

I am sorry for the email spam, it was a learning process.

I am not sure what results we would get by querying the MTU
before configuring it, since we can (and do) set the MTU using
SIOCSIFMTU.

On 2022-08-08 17:03, Stephen Hemminger wrote:
> On Mon, 8 Aug 2022 16:49:44 +0200
> Francesco Mancino <francesco.mancino at tutus.se> wrote:
> 
>> eth_dev_validate_mtu, introduced in 990912e676e, validates configured
>> MTU plus overhead against max_rx_pktlen.
>> Since TAP is a virtual device, it should support as big MTU as possible.
>>
>> Signed-off-by: Francesco Mancino <francesco.mancino at tutus.se>
> 	dev_info->min_rx_bufsize = 0;
> 
> 
> Thanks for your patience.
> 
> Since tap is built on top of an existing kernel network device a more
> complete solution would be to query the kernel device to find out what
> its MTU is. 
> 
> Acked-by: Stephen Hemminger <stephen at networkplumber.org>
>