netdev - RE: [PATCH v3 net-next 6/6] tls: Add generic NIC offload infrastructure.

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Message-ID: <AM4PR0501MB272304FEA861384F0F7895BCD40F0@AM4PR0501MB2723.eurprd05.prod.outlook.com>
Date:   Tue, 19 Dec 2017 15:38:16 +0000
From:   Ilya Lesokhin <ilyal@...lanox.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "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 6/6] tls: Add generic NIC offload
 infrastructure.

Tuesday, December 19, 2017 5:12 PM, Marcelo Ricardo Leitner wrote:

> > I'm not quite sure what you mean by "no net_device's are registered"
> > Presumably you mean there is no device that implements the
> > NETIF_F_HW_TLS_TX capability yet.
> 
> Not really. Let me try again. This patchset is using the expression "tls_device".
> When I read that, I expect a new interface type, like a tunnel, that would be
> created on top of another interface that has the offloading capability. That's
> why I'm confused. IMHO "tls_offload" is a better fit. Makes sense?
> 

We don't expose a new interface. An existing netdev does the offload.

The xfrm layer also calls the offload layer xfrm_device and It also doesn't need to
add another interface to offload ipsec to a netdev.

I thought about calling it tls_hw or tls_hw_offload.
The problem is that the important distinction here is that the 
offload is done by a netdev.
tls_sw can also use hw offload if you have the required 
memory to memory crypto engine and crypto_alloc_aead("gcm(aes)", 0, 0); 
decides on using it.