diff mbox series

[net-next,4/7] r8169: improve rtl_coalesce_choose_scale

Message ID 15ec315a-724b-e4ba-83ad-9df424307fa4@gmail.com
State New
Headers show
Series r8169: refactor and improve interrupt coalescing | expand

Commit Message

Heiner Kallweit April 30, 2020, 7:57 p.m. UTC 
The time limit provided by userspace is multiplied with 1000,
what could result in an overflow. Therefore change the time limit
parameter unit from ns to us, and avoid the problematic operation.
If there's no matching scale because provided time limit is too big,
return ERANGE instead of EINVAL to provide a hint to the user what's
wrong.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index d898e6f5f..a95615684 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -1854,8 +1854,8 @@  static int rtl_get_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
 	return 0;
 }
 
-/* choose appropriate scale factor and CPlusCmd[0:1] for (speed, nsec) */
-static int rtl_coalesce_choose_scale(struct rtl8169_private *tp, u32 nsec,
+/* choose appropriate scale factor and CPlusCmd[0:1] for (speed, usec) */
+static int rtl_coalesce_choose_scale(struct rtl8169_private *tp, u32 usec,
 				     u16 *cp01)
 {
 	const struct rtl_coalesce_info *ci;
@@ -1866,13 +1866,13 @@  static int rtl_coalesce_choose_scale(struct rtl8169_private *tp, u32 nsec,
 		return PTR_ERR(ci);
 
 	for (i = 0; i < 4; i++) {
-		if (nsec <= ci->scale_nsecs[i] * RTL_COALESCE_T_MAX) {
+		if (usec <= ci->scale_nsecs[i] * RTL_COALESCE_T_MAX / 1000U) {
 			*cp01 = i;
 			return ci->scale_nsecs[i];
 		}
 	}
 
-	return -EINVAL;
+	return -ERANGE;
 }
 
 static int rtl_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
@@ -1886,13 +1886,14 @@  static int rtl_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
 		{ ec->tx_max_coalesced_frames, ec->tx_coalesce_usecs }
 	}, *p = coal_settings;
 	u16 w = 0, cp01 = 0;
+	u32 coal_usec_max;
 	int scale, i;
 
 	if (rtl_is_8125(tp))
 		return -EOPNOTSUPP;
 
-	scale = rtl_coalesce_choose_scale(tp,
-			max(p[0].usecs, p[1].usecs) * 1000, &cp01);
+	coal_usec_max = max(ec->rx_coalesce_usecs, ec->tx_coalesce_usecs);
+	scale = rtl_coalesce_choose_scale(tp, coal_usec_max, &cp01);
 	if (scale < 0)
 		return scale;