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r8169: improve interrupt coalescing parameter handling 

The chip supports only frame limits 0, 4, 8, .. 60 internally.
Returning EINVAL for all val % 4 != 0 seems to be a little bit too
unfriendly to the user. Therefore round up the frame limit to the next
supported value. In addition round up the time limit, else a very low
limit could be rounded down to 0, and interpreted as "ignore value"
by the chip.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2020-04-30 21:58:06 +02:00 committed by David S. Miller
parent cb9d97de05
commit bdd2be3adb
1 changed files with 6 additions and 6 deletions
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12
drivers/net/ethernet/realtek/r8169_main.c
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@ -1909,21 +1909,21 @@ static int rtl_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
* - then user does `ethtool -C eth0 rx-usecs 100`
*
* since ethtool sends to kernel whole ethtool_coalesce
* settings, if we do not handle rx_usecs=!0, rx_frames=1
* we'll reject it below in `frames % 4 != 0`.
* settings, if we want to ignore rx_frames then it has
* to be set to 0.
*/
if (p->frames == 1) {
p->frames = 0;
}
units = p->usecs * 1000 / scale;
if (p->frames > RTL_COALESCE_FRAME_MAX || p->frames % 4)
return -EINVAL;
units = DIV_ROUND_UP(p->usecs * 1000, scale);
if (p->frames > RTL_COALESCE_FRAME_MAX)
return -ERANGE;
w <<= RTL_COALESCE_SHIFT;
w |= units;
w <<= RTL_COALESCE_SHIFT;
w |= p->frames >> 2;
w |= DIV_ROUND_UP(p->frames, 4);
}
rtl_lock_work(tp);