[CORE] Stack changes to add multiqueue hardware support API

Add the multiqueue hardware device support API to the core network
stack.  Allow drivers to allocate multiple queues and manage them at
the netdev level if they choose to do so.

Added a new field to sk_buff, namely queue_mapping, for drivers to
know which tx_ring to select based on OS classification of the flow.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index a0efdd7a6b3..4b06d193637 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -66,8 +66,9 @@ static void queue_process(struct work_struct *work)
 
                 local_irq_save(flags);
                 netif_tx_lock(dev);
-                if (netif_queue_stopped(dev) ||
-                    dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) {
+                if ((netif_queue_stopped(dev) ||
+                     netif_subqueue_stopped(dev, skb->queue_mapping)) ||
+                     dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) {
                         skb_queue_head(&npinfo->txq, skb);
                         netif_tx_unlock(dev);
                         local_irq_restore(flags);
@@ -254,7 +255,8 @@ static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
                 for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
                      tries > 0; --tries) {
                         if (netif_tx_trylock(dev)) {
-                                if (!netif_queue_stopped(dev))
+                                if (!netif_queue_stopped(dev) &&
+                                    !netif_subqueue_stopped(dev, skb->queue_mapping))
                                         status = dev->hard_start_xmit(skb, dev);
                                 netif_tx_unlock(dev);