netdev - Re: [RFC PATCH net-next 7/8] net: ipv4: listified version of ip

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Date:	Tue, 19 Apr 2016 17:50:45 +0100
From:	Edward Cree <ecree@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<netdev@...r.kernel.org>, David Miller <davem@...emloft.net>,
	"Jesper Dangaard Brouer" <brouer@...hat.com>,
	<linux-net-drivers@...arflare.com>
Subject: Re: [RFC PATCH net-next 7/8] net: ipv4: listified version of ip_rcv

On 19/04/16 15:50, Eric Dumazet wrote:
> The main problem in UDP stack today is having to lock the socket because
> of the dumb forward allocation problem.
I'm not quite sure what you're referring to here, care to educate me?

> Are you really going to provide
> a list of skbs up to _one_ UDP socket ?
In principle we should be able to take it that far, yes.  AFAICT the
socket already has a receive queue that we end up appending the packet
to (and which I presume the recvmsg() syscall pulls from), I don't see
why we couldn't just splice a list of skbs on the end rather than
appending them one by one.  Thus amortising looking up the socket.