netdev - Re: [PATCH 2/2] net/cdc_ncm: Add ntb_max_rx,ntb_max_tx cdc

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Date:   Tue, 14 Jun 2022 12:24:11 +0200
From:   Lukasz Spintzyk <lukasz.spintzyk@...aptics.com>
To:     Oliver Neukum <oneukum@...e.com>, netdev@...r.kernel.org
Cc:     ppd-posix@...aptics.com
Subject: Re: [PATCH 2/2] net/cdc_ncm: Add ntb_max_rx,ntb_max_tx cdc_ncm module
 parameters

On 13/06/2022 16:54, Oliver Neukum wrote:
> CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> On 13.06.22 10:02, Łukasz Spintzyk wrote:
>> This change allows to optionally adjust maximum RX and TX NTB size
>> to better match specific device capabilities, leading to
>> higher achievable Ethernet bandwidth.
>>
> Hi,
> 
> this is awkward a patch. If some devices need bigger buffers, the
> driver should grow its buffers for them without administrative
> intervention.
> 
>          Regards
>                  Oliver
> 

This is true,
Some of DisplayLink USB ethernet devices require values of TX and RX NTB 
size higher then 32kb and this is more then defined 
CDC_NCM_NTB_MAX_SIZE_TX/RX
I wanted to be careful and not increase limit of NTB size for all 
devices. But it would also by ok to me if we could increase 
CDC_NCM_NTB_MAX_SIZE_TX/RX to 64kb.

Regards
Lukasz Spintzyk