[PATCH 3/5] virtio_net: Add a set_rx_mode interface
From: Alex Williamson <hidden>
Date: 2009-01-16 21:15:21
Also in:
kvm
Subsystem:
networking drivers, the rest, virtio core, virtio net driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, "Michael S. Tsirkin", Jason Wang
Make use of the RX_MODE control virtqueue class to enable the set_rx_mode netdev interface. This allows us to selectively enable/disable promiscuous and allmulti mode so we don't see packets we don't want. We'll automatically enable these as needed if additional unicast or multicast addresses are requested. Signed-off-by: Alex Williamson <redacted> --- drivers/net/virtio_net.c | 28 +++++++++++++++++++++++++++- include/linux/virtio_net.h | 9 +++++++++ 2 files changed, 36 insertions(+), 1 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index d4be0a2..da96368 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c@@ -658,6 +658,31 @@ static int virtnet_set_tx_csum(struct net_device *dev, u32 data) return ethtool_op_set_tx_hw_csum(dev, data); } +static void virtnet_set_rx_mode(struct net_device *dev) +{ + struct virtnet_info *vi = netdev_priv(dev); + u8 promisc, allmulti; + + /* we're useless without the control virtqueue */ + if (!vi->cvq) + return; + + promisc = ((dev->flags & IFF_PROMISC) != 0 || dev->uc_count > 0); + allmulti = ((dev->flags & IFF_ALLMULTI) != 0 || dev->mc_count > 0); + + if (virtnet_send_command(vi, VIRTIO_NET_CTRL_RX_MODE, + VIRTIO_NET_CTRL_RX_MODE_PROMISC, + &promisc, sizeof(promisc))) + printk(KERN_WARNING "%s: Failed to %sable promisc mode.\n", + dev->name, promisc ? "en" : "dis"); + + if (virtnet_send_command(vi, VIRTIO_NET_CTRL_RX_MODE, + VIRTIO_NET_CTRL_RX_MODE_ALLMULTI, + &allmulti, sizeof(allmulti))) + printk(KERN_WARNING "%s: Failed to %sable allmulti mode.\n", + dev->name, allmulti ? "en" : "dis"); +} + static struct ethtool_ops virtnet_ethtool_ops = { .set_tx_csum = virtnet_set_tx_csum, .set_sg = ethtool_op_set_sg,
@@ -681,6 +706,7 @@ static const struct net_device_ops virtnet_netdev = { .ndo_start_xmit = start_xmit, .ndo_validate_addr = eth_validate_addr, .ndo_set_mac_address = virtnet_set_mac_address, + .ndo_set_rx_mode = virtnet_set_rx_mode, .ndo_change_mtu = virtnet_change_mtu, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = virtnet_netpoll,
@@ -770,7 +796,7 @@ static int virtnet_probe(struct virtio_device *vdev) /* * Outbound control channel virtqueue. We can live without it, - * so don't go fatal if it's not there. + * so don't go fatal if it's not there. Required for set_rx_mode. */ vi->cvq = vdev->config->find_vq(vdev, 2, NULL); if (IS_ERR(vi->cvq))
diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
index e2c1d81..f8afef3 100644
--- a/include/linux/virtio_net.h
+++ b/include/linux/virtio_net.h@@ -70,4 +70,13 @@ typedef __u8 virtio_net_ctrl_ack; #define VIRTIO_NET_OK 0 #define VIRTIO_NET_ERR 1 +/* + * Control the RX mode, ie. promisucous and allmulti. PROMISC and + * ALLMULTI commands require an "out" sg entry containing a 1 byte + * state value, zero = disable, non-zero = enable. + */ +#define VIRTIO_NET_CTRL_RX_MODE 0 + #define VIRTIO_NET_CTRL_RX_MODE_PROMISC 0 + #define VIRTIO_NET_CTRL_RX_MODE_ALLMULTI 1 + #endif /* _LINUX_VIRTIO_NET_H */