unable to enable jumbo frames on supported card

[Alessandro Tiberti]

tech info in the attachment
the broadcom 5761 supports jumbo frames as stated in the official user guide (page 5):
https://www.broadcom.com/docs/support/ethernet_nic/Broadcom_NetLink-NetXtreme_DTM_15.4.pdf

if I ty to set the MTU higher than 1500 I receive a "SIOCSIFMTU: Invalid argument" error.

Also tried with an old 12.04 disti but same effect.

I have the feeling I'm doing something wrong but really can't find so I came to the conclusion that must be a bug showing up for whatever reason.

Hardware is a Dell Precision M4800 with latest BIOS version (A13)

let me know if you need further information from what is already contained in the apport file.

I've found some statements about the card not supporting jumbo frames but nothing official.

thanks,
Alessandro

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1595233

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Alessandro Tiberti (alessandro-6)]

added apport file

[Alessandro Tiberti (alessandro-6)]

Hi Brad!

perhaps I raised a ticket for nothing: I find people mentioning using jumbo
frame on that card but no trace of the MTU size in the windows driver; some
says it doesn't support jumbo frames, some others yes, the official doc I
linked in the bug report says jumbo frames are supported... perhaps who'ss
been working on the tg3 kernel module/portion has got better info...

Long story short: don't get mad at it ;)

thanks,
Alessandro

2016-06-22 18:00 GMT+02:00 Brad Figg <email address hidden>:

> This bug is missing log files that will aid in diagnosing the problem.
> >From a terminal window please run:
>
> apport-collect 1595233
>
> and then change the status of the bug to 'Confirmed'.
>
> If, due to the nature of the issue you have encountered, you are unable
> to run this command, please add a comment stating that fact and change
> the bug status to 'Confirmed'.
>
> This change has been made by an automated script, maintained by the
> Ubuntu Kernel Team.
>
> ** Changed in: linux (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1595233
>
> Title:
> unable to enable jumbo frames on supported card
>
> Status in linux package in Ubuntu:
> Incomplete
>
> Bug description:
> tech info in the attachment
> the broadcom 5761 supports jumbo frames as stated in the official user
> guide (page 5):
>
> https://www.broadcom.com/docs/support/ethernet_nic/Broadcom_NetLink-NetXtreme_DTM_15.4.pdf
>
> if I ty to set the MTU higher than 1500 I receive a "SIOCSIFMTU:
> Invalid argument" error.
>
> Also tried with an old 12.04 disti but same effect.
>
> I have the feeling I'm doing something wrong but really can't find so
> I came to the conclusion that must be a bug showing up for whatever
> reason.
>
> Hardware is a Dell Precision M4800 with latest BIOS version (A13)
>
> let me know if you need further information from what is already
> contained in the apport file.
>
> I've found some statements about the card not supporting jumbo frames
> but nothing official.
>
> thanks,
> Alessandro
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1595233/+subscriptions
>