[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, 3 insertions, 0 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c989c3a0f907..6a41b96b3d37 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -419,6 +419,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
         n->nohdr = 0;
         C(pkt_type);
         C(ip_summed);
+        skb_copy_queue_mapping(n, skb);
         C(priority);
 #if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
         C(ipvs_property);
@@ -460,6 +461,7 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 #endif
         new->sk         = NULL;
         new->dev        = old->dev;
+        skb_copy_queue_mapping(new, old);
         new->priority   = old->priority;
         new->protocol   = old->protocol;
         new->dst        = dst_clone(old->dst);
@@ -1932,6 +1934,7 @@ struct sk_buff *skb_segment(struct sk_buff *skb, int features)
                 tail = nskb;
 
                 nskb->dev = skb->dev;
+                skb_copy_queue_mapping(nskb, skb);
                 nskb->priority = skb->priority;
                 nskb->protocol = skb->protocol;
                 nskb->dst = dst_clone(skb->dst);