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Date:   Thu, 23 Jul 2020 12:28:08 +0200
From:   Richard Sailer <>
To:     David Miller <>
Subject: Re: [PATCH net-next v5] net: dccp: Add SIOCOUTQ IOCTL support (send
 buffer fill)

> Applied, but I wonder if you'll also need something like tcp's SIOCOUTQNSD?
A good question. SIOCOUTQNSD is not mentioned in man 7 tcp and I didn't
know and consider it. Now that I looked it up (bytes of unsent packets
in send buffer) maybe this patch's ioctl should be renamed SIOCOUTQNSD,
since it returns the byte count of unsent packets.

I'm undecided here, this is also the only of these ioctl's that makes
sense for DCCP since DCCP does not keep sent but un-acked packets so
SIOCOUTQ does not exist for DCCP. Or SIOCOUTQ and SIOCOUTQNSD are the
same for DCCP, that's a viewpoint question. And it's anyhow correctly
documented in dccp.rst, it's about unsent packets.

So I'm undecided here, should I resend my patch renamed to SIOCOUTQNSD?

-- Richard

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