- Before IOB offload, srcaddr / src_addr_size / ifindex are written into
IOB by iob_trycopyin, so io_pktlen > 0 is always true, this check is
correct at that time. (It won't fail with zero-length UDP datagram.)
- After IOB offload, srcaddr / src_addr_size / ifindex are written into
offset 0, without increasing io_pktlen. So this check will fail with
zero-length UDP datagram now.
- We need to support zero-length UDP datagram and this check is
unnecessary at this point.
- https://stackoverflow.com/questions/5307031/how-to-detect-receipt-of-a-0-length-udp-datagram
- https://github.com/apache/nuttx/blob/nuttx-12.1.0/net/udp/udp_callback.c#L214
Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
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