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virtio_net: ethtool tx napi configuration

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Implement ethtool .set_coalesce (-C) and .get_coalesce (-c) handlers.
Interrupt moderation is currently not supported, so these accept and
display the default settings of 0 usec and 1 frame.

Toggle tx napi through setting tx-frames. So as to not interfere
with possible future interrupt moderation, value 1 means tx napi while
value 0 means not.

Only allow the switching when device is down for simplicity.

Link: https://patchwork.ozlabs.org/patch/948149/
Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2018-10-09 10:06:26 +08:00 committed by David S. Miller
parent 1a21cc507b
commit 0c465be183
1 changed files with 49 additions and 0 deletions
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49
drivers/net/virtio_net.c
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@ -2170,6 +2170,53 @@ static int virtnet_get_link_ksettings(struct net_device *dev,
return 0;
}
static int virtnet_set_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec)
{
struct ethtool_coalesce ec_default = {
.cmd = ETHTOOL_SCOALESCE,
.rx_max_coalesced_frames = 1,
};
struct virtnet_info *vi = netdev_priv(dev);
int i, napi_weight;
if (ec->tx_max_coalesced_frames > 1)
return -EINVAL;
ec_default.tx_max_coalesced_frames = ec->tx_max_coalesced_frames;
napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
/* disallow changes to fields not explicitly tested above */
if (memcmp(ec, &ec_default, sizeof(ec_default)))
return -EINVAL;
if (napi_weight ^ vi->sq[0].napi.weight) {
if (dev->flags & IFF_UP)
return -EBUSY;
for (i = 0; i < vi->max_queue_pairs; i++)
vi->sq[i].napi.weight = napi_weight;
}
return 0;
}
static int virtnet_get_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec)
{
struct ethtool_coalesce ec_default = {
.cmd = ETHTOOL_GCOALESCE,
.rx_max_coalesced_frames = 1,
};
struct virtnet_info *vi = netdev_priv(dev);
memcpy(ec, &ec_default, sizeof(ec_default));
if (vi->sq[0].napi.weight)
ec->tx_max_coalesced_frames = 1;
return 0;
}
static void virtnet_init_settings(struct net_device *dev)
{
struct virtnet_info *vi = netdev_priv(dev);
@ -2208,6 +2255,8 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
.get_ts_info = ethtool_op_get_ts_info,
.get_link_ksettings = virtnet_get_link_ksettings,
.set_link_ksettings = virtnet_set_link_ksettings,
.set_coalesce = virtnet_set_coalesce,
.get_coalesce = virtnet_get_coalesce,
};
static void virtnet_freeze_down(struct virtio_device *vdev)