[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, 22 insertions, 3 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 881fe80f01d0..2d6a14f5f2f1 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -196,7 +196,6 @@ typedef unsigned char *sk_buff_data_t;
  *      @sk: Socket we are owned by
  *      @tstamp: Time we arrived
  *      @dev: Device we arrived on/are leaving by
- *      @iif: ifindex of device we arrived on
  *      @transport_header: Transport layer header
  *      @network_header: Network layer header
  *      @mac_header: Link layer header
@@ -231,6 +230,8 @@ typedef unsigned char *sk_buff_data_t;
  *      @nfctinfo: Relationship of this skb to the connection
  *      @nfct_reasm: netfilter conntrack re-assembly pointer
  *      @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
+ *      @iif: ifindex of device we arrived on
+ *      @queue_mapping: Queue mapping for multiqueue devices
  *      @tc_index: Traffic control index
  *      @tc_verd: traffic control verdict
  *      @dma_cookie: a cookie to one of several possible DMA operations
@@ -246,8 +247,6 @@ struct sk_buff {
         struct sock             *sk;
         ktime_t                 tstamp;
         struct net_device       *dev;
-        int                     iif;
-        /* 4 byte hole on 64 bit*/
 
         struct  dst_entry       *dst;
         struct  sec_path        *sp;
@@ -290,12 +289,18 @@ struct sk_buff {
 #ifdef CONFIG_BRIDGE_NETFILTER
         struct nf_bridge_info   *nf_bridge;
 #endif
+
+        int                     iif;
+        __u16                   queue_mapping;
+
 #ifdef CONFIG_NET_SCHED
         __u16                   tc_index;       /* traffic control index */
 #ifdef CONFIG_NET_CLS_ACT
         __u16                   tc_verd;        /* traffic control verdict */
 #endif
 #endif
+        /* 2 byte hole */
+
 #ifdef CONFIG_NET_DMA
         dma_cookie_t            dma_cookie;
 #endif
@@ -1725,6 +1730,20 @@ static inline void skb_init_secmark(struct sk_buff *skb)
 { }
 #endif
 
+static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping)
+{
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+        skb->queue_mapping = queue_mapping;
+#endif
+}
+
+static inline void skb_copy_queue_mapping(struct sk_buff *to, const struct sk_buff *from)
+{
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+        to->queue_mapping = from->queue_mapping;
+#endif
+}
+
 static inline int skb_is_gso(const struct sk_buff *skb)
 {
         return skb_shinfo(skb)->gso_size;