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Date:   Mon, 13 Mar 2017 12:38:39 -0500
From:   Josh Hunt <>
To:     Eric Dumazet <>
Cc:     David Miller <>, Arnd Bergmann <>,
        Soheil Hassas Yeganeh <>,
        Willem de Bruijn <>,
        Paolo Abeni <>,,
        netdev <>
Subject: Re: [RFC PATCH] sock: add SO_RCVQUEUE_SIZE getsockopt

On 03/13/2017 11:12 AM, Eric Dumazet wrote:
> On Mon, Mar 13, 2017 at 8:59 AM, Josh Hunt <> wrote:
>> Allows application to read the amount of data sitting in the receive
>> queue.
>> Signed-off-by: Josh Hunt <>
>> ---
>> A team here is looking for a way to get the amount of data in a UDP socket's
>> receive queue. It seems like this should be SIOCINQ, but for UDP sockets that
>> returns the size of the next pending datagram. I implemented the patch below,
>> but am wondering if this is the right place for this change? I was debating
>> between this or a new UDP ioctl.
> But what is the 'amount of data' exactly ?
> Number of packets, amount of bytes to read from these packets ?

I meant bytes. I will clarify in the next version.

> You chose to report kernel memory usage, which is not guaranteed to be
> the same among kernels versions (or kernel configs)
> If we export these internals, I would export the whole thing, like we
> did with netlink
> ie tweak sock_diag_put_meminfo() and export the SK_MEMINFO_VARS
> So that we avoid adding other options in the future.

OK, so you're suggesting we provide all of the SK_MEMINFO_VARS data via 
socket option then? That sounds good to me. I will send that in a v2.


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