From dd1b119c835632f5d939f2a7351ad95001d9cb52 Mon Sep 17 00:00:00 2001
From: hayeswang <hayeswang@realtek.com>
Date: Wed, 20 Nov 2013 17:30:56 +0800
Subject: [PATCH] r8152: support stopping/waking tx queue

The maximum packet number which a tx aggregation buffer could contain
is the tx_qlen.

	tx_qlen = buffer size / (packet size + descriptor size).

If the tx buffer is empty and the queued packets are more than the
maximum value which is defined above, stop the tx queue. Wake the
tx queue if tx queue is stopped and the queued packets are less than
tx_qlen.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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