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r8169: add check for invalid parameter combination in rtl_set_coalesce

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Realtek provided information about a HW constraint that time limit must
not be set to 0 if the frame limit is >0. Add a check for this and
reject invalid parameter combinations.

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 21:59:48 +02:00 committed by David S. Miller
parent 2b3e48b665
commit 81496b72e9
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/realtek/r8169_main.c
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@ -1908,6 +1908,11 @@ static int rtl_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
if (tx_fr == 1)
tx_fr = 0;
/* HW requires time limit to be set if frame limit is set */
if ((tx_fr && !ec->tx_coalesce_usecs) ||
(rx_fr && !ec->rx_coalesce_usecs))
return -EINVAL;
w |= FIELD_PREP(RTL_COALESCE_TX_FRAMES, DIV_ROUND_UP(tx_fr, 4));
w |= FIELD_PREP(RTL_COALESCE_RX_FRAMES, DIV_ROUND_UP(rx_fr, 4));