From: Giuseppe CAVALLARO <peppe.cavallaro@st.com>
Date: Sun, 25 Nov 2012 23:10:42 +0000 (+0000)
Subject: stmmac: add the initial tx coalesce schema
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~45^2~214
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9125cdd1be1199588f71c99e76e32bcda0b7d847;p=pandora-kernel.git

stmmac: add the initial tx coalesce schema

This patch adds a new schema used for mitigating the
number of transmit interrupts.
It is based on a SW timer and a threshold value.
The timer is used to periodically call the stmmac_tx_clean
function; the threshold is used for setting the IC (Interrupt
on Completion bit). The ISR will then invoke the poll method.
Also the patch improves some ethtool stat fields.

V2: review the logic to manage the IC bit in the TDESC
that was bugged because it didn't take care about the
fragments. Also fix the tx_count_frames that has not to be
limited to TX DMA ring. Thanks to Ben Hutchings.

V3: removed the spin_lock irqsave/restore as D. Miller suggested.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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