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| author | Jason Wang <jasowang@redhat.com> | 2018-10-09 10:06:26 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-10 22:34:38 -0700 |
| commit | 0c465be183c7c57a26446df6ea96d8676b865f92 (patch) | |
| tree | a32ec09bd8ecc98c6da27205b0affa070bc55c52 /drivers | |
| parent | 1a21cc507bb75954bd8618f193179e2a3f8d9069 (diff) | |
| download | linux-0c465be183c7c57a26446df6ea96d8676b865f92.tar.gz linux-0c465be183c7c57a26446df6ea96d8676b865f92.tar.bz2 linux-0c465be183c7c57a26446df6ea96d8676b865f92.zip | |
virtio_net: ethtool tx napi configuration
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/virtio_net.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index dab504ec5e50..3f5aa59c37b7 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -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) |