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 05:47:47 +0000
From:   Lukasz Spintzyk <Lukasz.Spintzyk@...aptics.com>
To:     Oliver Neukum <oneukum@...e.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     PPD-POSIX <PPD-POSIX@...aptics.com>
Subject: RE: [PATCH 2/2] net/cdc_ncm: Add ntb_max_rx,ntb_max_tx cdc_ncm module
 parameters

This Is true, 
Some of Synaptics USB eth devices require values of TX and RX NTB size higher then 32kb and this is more then CDC_NCM_NTB_MAX_SIZE_TX/RX
I wanted to be careful an 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

-----Original Message-----
From: Oliver Neukum <oneukum@...e.com> 
Sent: Monday, June 13, 2022 4:54 PM
To: Lukasz Spintzyk <Lukasz.Spintzyk@...aptics.com>; netdev@...r.kernel.org
Cc: PPD-POSIX <PPD-POSIX@...aptics.com>
Subject: Re: [PATCH 2/2] net/cdc_ncm: Add ntb_max_rx,ntb_max_tx cdc_ncm module parameters

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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