On Mon, Mar 13, 2017 at 8:59 AM, Josh Hunt [off-list ref] wrote:

Allows application to read the amount of data sitting in the receive
queue.

Signed-off-by: Josh Hunt <redacted>
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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 ?

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.