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net: fix ethtool->set_flags not intended -EINVAL return value

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After commit d5dbda2380 "ethtool: Add
support for vlan accleration.", drivers that have NETIF_F_HW_VLAN_TX,
and/or NETIF_F_HW_VLAN_RX feature, but do not allow enable/disable vlan
acceleration via ethtool set_flags, always return -EINVAL from that
function. Fix by returning -EINVAL only if requested features do not
match current settings and can not be changed by driver.

Change any driver that define ethtool->set_flags to use
ethtool_invalid_flags() to avoid similar problems in the future
(also on drivers that do not have the problem).

Tested with modified (to reproduce this bug) myri10ge driver.

Cc: stable@kernel.org # 2.6.37+
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stanislaw Gruszka 2011-03-22 23:54:49 +00:00 • committed by David S. Miller
parent b5845f9834
commit 673e63c688
7 changed files with 24 additions and 8 deletions
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17
net/core/ethtool.c
View file

@ -141,9 +141,24 @@ u32 ethtool_op_get_flags(struct net_device *dev)
}
EXPORT_SYMBOL(ethtool_op_get_flags);
/* Check if device can enable (or disable) particular feature coded in "data"
* argument. Flags "supported" describe features that can be toggled by device.
* If feature can not be toggled, it state (enabled or disabled) must match
* hardcoded device features state, otherwise flags are marked as invalid.
*/
bool ethtool_invalid_flags(struct net_device *dev, u32 data, u32 supported)
{
u32 features = dev->features & flags_dup_features;
/* "data" can contain only flags_dup_features bits,
* see __ethtool_set_flags */
return (features & ~supported) != (data & ~supported);
}
EXPORT_SYMBOL(ethtool_invalid_flags);
int ethtool_op_set_flags(struct net_device *dev, u32 data, u32 supported)
{
if (data & ~supported)
if (ethtool_invalid_flags(dev, data, supported))
return -EINVAL;
dev->features = ((dev->features & ~flags_dup_features) |