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From: David Miller <davem@davemloft.net>
Subject: Re: [Linux-ATM-General] [PATCH] atm/br2684: netif_stop_queue()
 when atm device busy and netif_wake_queue() when we can send packets again.
Date: Fri, 11 Sep 2009 11:48:48 -0700 (PDT)
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From: Karl Hiramoto <karl@hiramoto.org>
Date: Thu, 10 Sep 2009 23:30:44 +0200

> I'm not really sure if or how many packets to upper layers buffer.

This is determined by ->tx_queue_len, so whatever value is being
set for ATM network devices is what the core will use for backlog
limiting while the device's TX queue is stopped.