On 02/02/2016 02:23 PM, Michael S. Tsirkin wrote:
> On Tue, Feb 02, 2016 at 01:51:20PM +0100, Nikolay Aleksandrov wrote:
>> From: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
>>
>> This patch allows the user to set and retrieve speed and duplex of the
>> virtio_net device via ethtool. Having this functionality is very helpful
>> for simulating different environments and also enables the virtio_net
>> device to participate in operations where proper speed and duplex are
>> required (e.g. currently bonding lacp mode requires full duplex). Custom
>> speed and duplex are not allowed, the user-supplied settings are validated
>> before applying. Only full and unknown duplex are allowed to be set.
>
> Why isn't half duplex legal?
>
It is legal, I'm just not sure it makes sense. Isn't the virtual channel
always "full duplex" ?
At first I had allowed it, but then I decided against and removed it. I
don't mind adding it back though, the argument against is not strong.
>>
>> Example:
>> $ ethtool eth1
>> Settings for eth1:
>> ...
>> Speed: Unknown!
>> Duplex: Unknown! (255)
>> $ ethtool -s eth1 speed 1000 duplex full
>> $ ethtool eth1
>> Settings for eth1:
>> ...
>> Speed: 1000Mb/s
>> Duplex: Full
>>
>> Based on a patch by Roopa Prabhu.
>>
>> CC: Roopa Prabhu <roopa@xxxxxxxxxxxxxxxxxxx>
>> CC: Michael S. Tsirkin <mst@xxxxxxxxxx>
>> CC: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
>> Signed-off-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
>
> Thanks!
> Looks ok with one comment, see below.
>
>> ---
>> Allowed to set unknown speed/duplex if the user wants to reset them, though
>> the user-space ethtool tool currently doesn't allow setting them.
>>
>> drivers/net/virtio_net.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 74 insertions(+)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index 767ab11a6e9f..722ade567ee5 100644
>> --- a/drivers/net/virtio_net.c
>> +++ b/drivers/net/virtio_net.c
>> @@ -146,6 +146,10 @@ struct virtnet_info {
>> virtio_net_ctrl_ack ctrl_status;
>> u8 ctrl_promisc;
>> u8 ctrl_allmulti;
>> +
>> + /* Ethtool settings */
>> + u8 duplex;
>> + u32 speed;
>> };
>>
>> struct padded_vnet_hdr {
>> @@ -1376,6 +1380,72 @@ static void virtnet_get_channels(struct net_device *dev,
>> channels->other_count = 0;
>> }
>>
>> +static bool virtnet_validate_speed(u32 speed)
>> +{
>> + switch (speed) {
>> + case SPEED_10:
>> + case SPEED_100:
>> + case SPEED_1000:
>> + case SPEED_2500:
>> + case SPEED_5000:
>> + case SPEED_10000:
>> + case SPEED_20000:
>> + case SPEED_25000:
>> + case SPEED_40000:
>> + case SPEED_50000:
>> + case SPEED_56000:
>> + case SPEED_100000:
>> + case SPEED_UNKNOWN:
>> + return true;
>> + }
>> +
>> + return false;
>> +}
>> +
>> +static bool virtnet_validate_duplex(u8 duplex)
>> +{
>> + switch (duplex) {
>> + case DUPLEX_FULL:
>> + case DUPLEX_UNKNOWN:
>> + return true;
>> + }
>> +
>> + return false;
>> +}
>
> Let's put the validating functions near where the
> enums are defined so people remember to extend these
> when adding new speeds?
> Will help e.g. tun reuse this, too.
>
Right, very good suggestion. I'll split this patch in two and will
add them for everyone to use.
Thank you,
Nik
>> +
>> +static int virtnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
>> +{
>> + struct virtnet_info *vi = netdev_priv(dev);
>> + u32 speed = ethtool_cmd_speed(cmd);
>> +
>> + /* don't allow custom speed and duplex */
>> + if (!virtnet_validate_speed(speed) ||
>> + !virtnet_validate_duplex(cmd->duplex))
>> + return -EINVAL;
>> + vi->speed = speed;
>> + vi->duplex = cmd->duplex;
>> +
>> + return 0;
>> +}
>> +
>> +static int virtnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
>> +{
>> + struct virtnet_info *vi = netdev_priv(dev);
>> +
>> + ethtool_cmd_speed_set(cmd, vi->speed);
>> + cmd->duplex = vi->duplex;
>> +
>> + return 0;
>> +}
>> +
>> +static void virtnet_init_settings(struct net_device *dev)
>> +{
>> + struct virtnet_info *vi = netdev_priv(dev);
>> +
>> + vi->speed = SPEED_UNKNOWN;
>> + vi->duplex = DUPLEX_UNKNOWN;
>> +}
>> +
>> static const struct ethtool_ops virtnet_ethtool_ops = {
>> .get_drvinfo = virtnet_get_drvinfo,
>> .get_link = ethtool_op_get_link,
>> @@ -1383,6 +1453,8 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
>> .set_channels = virtnet_set_channels,
>> .get_channels = virtnet_get_channels,
>> .get_ts_info = ethtool_op_get_ts_info,
>> + .get_settings = virtnet_get_settings,
>> + .set_settings = virtnet_set_settings,
>> };
>>
>> #define MIN_MTU 68
>> @@ -1855,6 +1927,8 @@ static int virtnet_probe(struct virtio_device *vdev)
>> netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
>> netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
>>
>> + virtnet_init_settings(dev);
>> +
>> err = register_netdev(dev);
>> if (err) {
>> pr_debug("virtio_net: registering device failed\n");
>> --
>> 2.4.3
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