netdev - Re: UDP sockets oddities

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Date:   Fri, 25 Aug 2017 21:17:24 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     eric.dumazet@...il.com, netdev@...r.kernel.org, pabeni@...hat.com,
        willemb@...gle.com
Subject: Re: UDP sockets oddities

From: Florian Fainelli <f.fainelli@...il.com>
Date: Fri, 25 Aug 2017 20:25:26 -0700

> It would. Since the call trace involves udp_send_skb() how come we are
> not returning an error to write(2)? are there other code paths where the
> neighbor code can do drops like these?

Keep in mind that the neighbour code isn't dropping the current 'skb'
coming from the IP stack, it's dropping the oldest packet in the
resolution queue.