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net: mv643xx_eth: ensure coalesce settings survive read-modify-write 

The coalesce settings behave badly when changing just one value:

... # ethtool -c eth0
rx-usecs: 249
... # ethtool -C eth0 tx-usecs 250
... # ethtool -c eth0
rx-usecs: 248

This occurs due to rounding errors when calculating the microseconds
value - the divisons round down.  This causes (eg) the rx-usecs to
decrease by one every time the tx-usecs value is set as per the above.

Fix this by making the divison round-to-nearest.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2016-11-01 10:50:01 +00:00 committed by David S. Miller
parent 42fb18fd58
commit b9b84fc07d
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/marvell/mv643xx_eth.c
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@ -1381,6 +1381,7 @@ static unsigned int get_rx_coal(struct mv643xx_eth_private *mp)
temp = (val & 0x003fff00) >> 8;
temp *= 64000000;
temp += mp->t_clk / 2;
do_div(temp, mp->t_clk);
return (unsigned int)temp;
@ -1417,6 +1418,7 @@ static unsigned int get_tx_coal(struct mv643xx_eth_private *mp)
temp = (rdlp(mp, TX_FIFO_URGENT_THRESHOLD) & 0x3fff0) >> 4;
temp *= 64000000;
temp += mp->t_clk / 2;
do_div(temp, mp->t_clk);
return (unsigned int)temp;