netdev - Re: [PATCH v7 01/23] net: Introduce direct data placement tcp offload

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Date:   Fri, 04 Nov 2022 15:44:57 +0200
From:   Aurelien Aptel <aaptel@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Shai Malin <smalin@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "sagi@...mberg.me" <sagi@...mberg.me>, "hch@....de" <hch@....de>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>,
        Chaitanya Kulkarni <chaitanyak@...dia.com>,
        Or Gerlitz <ogerlitz@...dia.com>,
        Yoray Zack <yorayz@...dia.com>,
        Boris Pismenny <borisp@...dia.com>,
        "aurelien.aptel@...il.com" <aurelien.aptel@...il.com>,
        "malin1024@...il.com" <malin1024@...il.com>
Subject: Re: [PATCH v7 01/23] net: Introduce direct data placement tcp offload


Jakub Kicinski kuba@...nel.org writes:
> Sounds good. Just to be clear - I was suggesting:
>
>         net_device_ops->ddp_ulp_ops->set_ulp_caps()
>
> so an extra indirection, but if you're worried about the overhead
> an ndo is fine, too.

Sure, thanks.

>> We add ETHTOOL messages to get and set ULP caps:
>>
>> - ETHTOOL_MSG_ULP_CAPS_GET: get device ulp capabilities
>> - ETHTOOL_MSG_ULP_CAPS_SET: set device up capabilities
>
> ULP or DDP? Are you planning to plumb TLS thru the same ops?
> Otherwise ULP on its own may be a little too generic of a name.

TLS is not in our scope. It was originally used as a reference.
We will use the term "ULP_DDP".

>
>> The GET reply code can use ethnl_put_bitset32() which does the job of
>> sending bits + their names as strings.
>>
>> The SET code would apply the changes to netdev->ulp_ddp_caps.caps_active.
>>
>> # Statistics
>>
>> If the ETHTOOL_MSG_ULP_CAPS_GET message requests statistics (by
>
> Would it make sense to drop the _CAPS from the name, then?
> Or replace by something more general, like INFO?

Ok, we will drop the _CAPS.

>>    # query ULP stats of $dev
>>    ethtool -u|--ulp-get --include-statistics <dev>
>
> -I|--include-statistics ?

Could you please elaborate what is the comment?

>>    # set $cap to $val on device $dev
>>    -U|--ulp-set <dev> <cap> [on|off]
>
> Sounds good!

Since -u is taken we are going with -J/-j and --ulp-ddp to keep it
consistent with the netlink flags.

> Thanks for describing the options! I definitely prefer ethtool/netlink.

Great, we will add it in v8.

Thanks