netdev - Re: [PATCH v3] net: dccp: Add SIOCOUTQ IOCTL support (send buffer fill)

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Date:   Wed, 03 Jun 2020 10:47:25 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     richard_siegfried@...temli.org
Cc:     gerrit@....abdn.ac.uk, dccp@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3] net: dccp: Add SIOCOUTQ IOCTL support (send buffer
 fill)

From: Richard Sailer <richard_siegfried@...temli.org>
Date: Wed,  3 Jun 2020 13:10:51 +0200

> This adds support for the SIOCOUTQ IOCTL to get the send buffer fill
> of a DCCP socket, like UDP and TCP sockets already have.
> 
> Regarding the used data field: DCCP uses per packet sequence numbers,
> not per byte, so sequence numbers can't be used like in TCP. sk_wmem_queued
> is not used by DCCP and always 0, even in test on highly congested paths.
> Therefore this uses sk_wmem_alloc like in UDP.
> 
> Signed-off-by: Richard Sailer <richard_siegfried@...temli.org>
> ---
> v3: whitespace fixes

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