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net/ethtool: Introduce link_ksettings API for virtual network devices

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With the ethtool_virtdev_set_link_ksettings function in core/ethtool.c,
ibmveth, netvsc, and virtio now use the core's helper function.

Funtionality changes that pertain to ibmveth driver include:

  1. Changed the initial hardcoded link speed to 1GB.

  2. Added support for allowing a user to change the reported link
  speed via ethtool.

Functionality changes to the netvsc driver include:

  1. When netvsc_get_link_ksettings is called, it will defer to the VF
  device if it exists to pull accelerated networking values, otherwise
  pull default or user-defined values.

  2. Similarly, if netvsc_set_link_ksettings called and a VF device
  exists, the real values of speed and duplex are changed.

Signed-off-by: Cris Forno <cforno12@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cris Forno
2020-02-28 14:12:05 -06:00
committed by David S. Miller
parent 70ae1e127b
commit 9aedc6e2f1
4 changed files with 51 additions and 85 deletions
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39
drivers/net/virtio_net.c
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@@ -2178,48 +2178,13 @@ static void virtnet_get_channels(struct net_device *dev,
channels->other_count = 0;
}
/* Check if the user is trying to change anything besides speed/duplex */
static bool
virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd)
{
struct ethtool_link_ksettings diff1 = *cmd;
struct ethtool_link_ksettings diff2 = {};
/* cmd is always set so we need to clear it, validate the port type
* and also without autonegotiation we can ignore advertising
*/
diff1.base.speed = 0;
diff2.base.port = PORT_OTHER;
ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
diff1.base.duplex = 0;
diff1.base.cmd = 0;
diff1.base.link_mode_masks_nwords = 0;
return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) &&
bitmap_empty(diff1.link_modes.supported,
__ETHTOOL_LINK_MODE_MASK_NBITS) &&
bitmap_empty(diff1.link_modes.advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS) &&
bitmap_empty(diff1.link_modes.lp_advertising,
__ETHTOOL_LINK_MODE_MASK_NBITS);
}
static int virtnet_set_link_ksettings(struct net_device *dev,
const struct ethtool_link_ksettings *cmd)
{
struct virtnet_info *vi = netdev_priv(dev);
u32 speed;
speed = cmd->base.speed;
/* don't allow custom speed and duplex */
if (!ethtool_validate_speed(speed) ||
!ethtool_validate_duplex(cmd->base.duplex) ||
!virtnet_validate_ethtool_cmd(cmd))
return -EINVAL;
vi->speed = speed;
vi->duplex = cmd->base.duplex;
return 0;
return ethtool_virtdev_set_link_ksettings(dev, cmd,
&vi->speed, &vi->duplex);
}
static int virtnet_get_link_ksettings(struct net_device *dev,