[RFC PATCH net-next 2/3] macvlan: add queue selection functionality

[Vladislav Yasevich <vyasevich@gmail.com>]

This patch adds a simple queue selection function to macvlan
layer.  In most cases, this will just use the standard fallback
fuction, but when rx-queue has been recoreded we'll try to use
that value.

Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
---
 drivers/net/macvlan.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 94e6888..213d587 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1018,6 +1018,25 @@ static int macvlan_dev_get_iflink(const struct net_device *dev)
 	return vlan->lowerdev->ifindex;
 }
 
+static u16 macvlan_select_queue(struct net_device *dev,
+				struct sk_buff *skb,
+				void *accel_priv,
+				select_queue_fallback_t fallback)
+{
+	u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
+
+	if (!txq)
+		return fallback(dev, skb);
+
+	if (unlikely(txq >= dev->real_num_tx_queues)) {
+		do {
+			txq -= dev->real_num_tx_queues;
+		} while (txq >= dev->real_num_tx_queues);
+	}
+	return txq;
+}
+
+
 static const struct ethtool_ops macvlan_ethtool_ops = {
 	.get_link		= ethtool_op_get_link,
 	.get_settings		= macvlan_ethtool_get_settings,
@@ -1048,6 +1067,7 @@ static const struct net_device_ops macvlan_netdev_ops = {
 	.ndo_netpoll_setup	= macvlan_dev_netpoll_setup,
 	.ndo_netpoll_cleanup	= macvlan_dev_netpoll_cleanup,
 #endif
+	.ndo_select_queue	= macvlan_select_queue,
 	.ndo_get_iflink		= macvlan_dev_get_iflink,
 	.ndo_features_check	= passthru_features_check,
 };
-- 
2.1.0