netdev - UDP GRO do not restore ervery UDP Packet

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Message-ID: <CAChiyMrhch1YEWSBKheJf36OfHsOf994C43xOb9-0qiGbj8RkQ@mail.gmail.com>
Date:   Tue, 9 Apr 2019 14:09:36 +0800
From:   Sean Tong <seantong114@...il.com>
To:     netdev <netdev@...r.kernel.org>
Subject: UDP GRO do not restore ervery UDP Packet

I find that I do not restore every UDP paket from recvmsg when I
programming with  UDP_GRO in kernel version 5.0
I can get gso_size, but I do not know the last UDP packet size in
aggregate datagram.
For example, recvmsg returns  a packet size 50  of  and gso_size of
24, so the UDP packets is restored without knowing whether it is
24+24+2 split into 3 packets or 24+26 split into 2 pakcets.
Is there any way to get the last UDP packet size or number of merged
UDP packets?