netdev - Re: [PATCH v3 net-next 1/6] tcp: Add clean acked data hook

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Date:   Tue, 19 Dec 2017 11:28:51 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Ilya Lesokhin <ilyal@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
Cc:     "davejwatson@...com" <davejwatson@...com>,
        "tom@...bertland.com" <tom@...bertland.com>,
        "hannes@...essinduktion.org" <hannes@...essinduktion.org>,
        Boris Pismenny <borisp@...lanox.com>,
        Aviad Yehezkel <aviadye@...lanox.com>,
        Liran Liss <liranl@...lanox.com>
Subject: Re: [PATCH v3 net-next 1/6] tcp: Add clean acked data hook

On Tue, 2017-12-19 at 19:21 +0000, Ilya Lesokhin wrote:
> > 1) tcp_ack() is already very expensive.
> > 
> 
> I'm not sure how what we should do with that comment. We need
> Some trigger to free TLS records. tcp_ack seemed like a reasonable
> Trigger.

TLS records should be attached to skbs ?

It seems more reasonable to free TLS when skb are freed, and not in
general tcp_ack() path.

> 
> > 2) Since you do not pass any state here, this looks very suspicious to
> > me.
> > 
> 
> The state we need is the acknowledged sequence and it located in the socket.
> https://github.com/Mellanox/tls-offload/blob/tls_device_v3/net/tls/tls_device.c#L157

So it looks like TCP stack is bleeding all over the places ?

So in the future, a change in TCP stack will have to make sure we do
not break net/tls/... compilation.

Not pretty.