netdev - Re: [PATCH V1 net-next 0/5] Add devlink support to ena

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Message-ID: <f2fd4262-58b7-147d-2784-91f2431c53df@nvidia.com>
Date:   Thu, 12 Jan 2023 12:31:04 +0200
From:   Gal Pressman <gal@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "Arinzon, David" <darinzon@...zon.com>
Cc:     David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Machulsky, Zorik" <zorik@...zon.com>,
        "Matushevsky, Alexander" <matua@...zon.com>,
        "Bshara, Saeed" <saeedb@...zon.com>,
        "Bshara, Nafea" <nafea@...zon.com>,
        "Saidi, Ali" <alisaidi@...zon.com>,
        "Kiyanovski, Arthur" <akiyano@...zon.com>,
        "Dagan, Noam" <ndagan@...zon.com>,
        "Agroskin, Shay" <shayagr@...zon.com>,
        "Itzko, Shahar" <itzko@...zon.com>,
        "Abboud, Osama" <osamaabb@...zon.com>
Subject: Re: [PATCH V1 net-next 0/5] Add devlink support to ena

On 11/01/2023 22:00, Jakub Kicinski wrote:
> On Wed, 11 Jan 2023 19:31:39 +0000 Arinzon, David wrote:
>> If the packet network headers are not within the size of the LLQ entry, then the packet will
>> be dropped. So I'll say that c) describes the impact the best given that certain types of
>> traffic will not succeed or have disruptions due to dropped TX packets.
> 
> I see. Sounds like it could be a fit for
> DEVLINK_ATTR_ESWITCH_INLINE_MODE ? But that one configures the depth of
> the headers copied inline, rather than bytes. We could add a value for
> "tunneled" and have that imply 256B LLQ in case of ena.
> 
> The other option is to introduce the concept of "max length of inline
> data" to ethtool, and add a new netlink attribute to ethtool -g.

TX copybreak? When the user sets it to > 96 bytes, use the large LLQ.

BTW, shouldn't ethtool's tx_push reflect the fact that LLQs are being
used? I don't see it used in ena.