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batman-adv: Revert "disable ethtool link speed detection when auto negotiation off"

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The commit 8c46fcd783 ("batman-adv: disable ethtool link speed detection
when auto negotiation off") disabled the usage of ethtool's link_ksetting
when auto negotation was enabled due to invalid values when used with
tun/tap virtual net_devices. According to the patch, automatic measurements
should be used for these kind of interfaces.

But there are major flaws with this argumentation:

* automatic measurements are not implemented
* auto negotiation has nothing to do with the validity of the retrieved
  values

The first point has to be fixed by a longer patch series. The "validity"
part of the second point must be addressed in the same patch series by
dropping the usage of ethtool's link_ksetting (thus always doing automatic
measurements over ethernet).

Drop the patch again to have more default values for various net_device
types/configurations. The user can still overwrite them using the
batadv_hardif's BATADV_ATTR_THROUGHPUT_OVERRIDE.

Reported-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2019-11-25 10:46:50 +01:00 committed by Simon Wunderlich
parent cf78bb0bbc
commit 9ad346c905
1 changed files with 1 additions and 14 deletions
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15
net/batman-adv/bat_v_elp.c
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@ -127,20 +127,7 @@ static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh)
rtnl_lock();
ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings);
rtnl_unlock();
/* Virtual interface drivers such as tun / tap interfaces, VLAN, etc
* tend to initialize the interface throughput with some value for the
* sake of having a throughput number to export via ethtool. This
* exported throughput leaves batman-adv to conclude the interface
* throughput is genuine (reflecting reality), thus no measurements
* are necessary.
*
* Based on the observation that those interface types also tend to set
* the link auto-negotiation to 'off', batman-adv shall check this
* setting to differentiate between genuine link throughput information
* and placeholders installed by virtual interfaces.
*/
if (ret == 0 && link_settings.base.autoneg == AUTONEG_ENABLE) {
if (ret == 0) {
/* link characteristics might change over time */
if (link_settings.base.duplex == DUPLEX_FULL)
hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX;