netdev - Re: [RFC PATCH] sock: add SO_RCVQUEUE

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Message-Id: <20170313.171008.1845413549443399902.davem@davemloft.net>
Date:   Mon, 13 Mar 2017 17:10:08 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     johunt@...mai.com
Cc:     edumazet@...gle.com, arnd@...db.de, soheil@...gle.com,
        willemb@...gle.com, pabeni@...hat.com, linux-arch@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RFC PATCH] sock: add SO_RCVQUEUE_SIZE getsockopt

From: Josh Hunt <johunt@...mai.com>
Date: Mon, 13 Mar 2017 18:34:41 -0500

> In this particular case they really do want to know total # of bytes
> in the receive queue, not the data bytes they can consume from an
> application pov. The kernel currently only exposes this value through
> netlink or /proc/net/udp from what I saw.

Can you explain in what way this is useful?

The difference between skb->len and skb->truesize is really kernel
internal implementation detail, and I'm trying to figure out why
this would be useful to an application.