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net: thunderbolt: Allow reading link settings

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In order to use Thunderbolt networking as part of bonding device it
needs to support ->get_link_ksettings() ethtool operation, so that the
bonding driver can read the link speed and the related attributes. Add
support for this to the driver.

Signed-off-by: Ian MacDonald <ian@netstatz.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://patch.msgid.link/20260115115646.328898-5-mika.westerberg@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ian MacDonald 2026-01-15 12:56:46 +01:00 • committed by Jakub Kicinski
parent 2e62e5565b
commit 7a3d3279a5
1 changed files with 49 additions and 0 deletions
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49
drivers/net/thunderbolt/main.c
View file

@ -10,6 +10,7 @@
*/
#include <linux/atomic.h>
#include <linux/ethtool.h>
#include <linux/highmem.h>
#include <linux/if_vlan.h>
#include <linux/jhash.h>
@ -1265,6 +1266,53 @@ static const struct net_device_ops tbnet_netdev_ops = {
.ndo_get_stats64 = tbnet_get_stats64,
};
static int tbnet_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
const struct tbnet *net = netdev_priv(dev);
const struct tb_xdomain *xd = net->xd;
int speed;
ethtool_link_ksettings_zero_link_mode(cmd, supported);
ethtool_link_ksettings_zero_link_mode(cmd, advertising);
/* Figure out the current link speed and width */
switch (xd->link_speed) {
case 40:
speed = SPEED_80000;
break;
case 20:
if (xd->link_width == 2)
speed = SPEED_40000;
else
speed = SPEED_20000;
break;
case 10:
if (xd->link_width == 2) {
speed = SPEED_20000;
break;
}
fallthrough;
default:
speed = SPEED_10000;
break;
}
cmd->base.speed = speed;
cmd->base.duplex = DUPLEX_FULL;
cmd->base.autoneg = AUTONEG_DISABLE;
cmd->base.port = PORT_OTHER;
return 0;
}
static const struct ethtool_ops tbnet_ethtool_ops = {
.get_link_ksettings = tbnet_get_link_ksettings,
};
static void tbnet_generate_mac(struct net_device *dev)
{
const struct tbnet *net = netdev_priv(dev);
@ -1315,6 +1363,7 @@ static int tbnet_probe(struct tb_service *svc, const struct tb_service_id *id)
strcpy(dev->name, "thunderbolt%d");
dev->netdev_ops = &tbnet_netdev_ops;
dev->ethtool_ops = &tbnet_ethtool_ops;
/* ThunderboltIP takes advantage of TSO packets but instead of
* segmenting them we just split the packet into Thunderbolt