netdev - Re: Generalizing mmap'ed sockets

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Message-ID: <AANLkTinCS2LuNv3opCvTcTrxbm5HzFy7JESdu_CzyrFB@mail.gmail.com>
Date:	Fri, 19 Nov 2010 13:55:15 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	rick.jones2@...com, netdev@...r.kernel.org
Subject: Re: Generalizing mmap'ed sockets

On Fri, Nov 19, 2010 at 1:52 PM, David Miller <davem@...emloft.net> wrote:
> From: Rick Jones <rick.jones2@...com>
> Date: Fri, 19 Nov 2010 13:32:57 -0800
>
>> I suppose then one would be able to track the consumer pointer (on tx)
>> to "know" that certain data had been ACKed by the remote?  For TCP
>> anyway - and assuming there wouldn't be a case where TCP might copy
>> the data out of the ring and assert "completion."
>
> Yes, that's implicit in his design, the kernel manages the consumer
> pointer in the ring and this is how userspace can see when ring entries
> are reusable.
>

And, for stream sockets the ring would be one big contiguous buffer,
for datagram would be packetized buffer like with packet interface.
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