Move pkt replication counter to the opaque2 cache line

Change-Id: I5e6edfd03ab41949be2c768dfe68aa824bbc1f38
Signed-off-by: Dave Barach <dave@barachs.net>

9 files changed, 17 insertions, 20 deletions

diff --git a/vnet/vnet/devices/af_packet/node.c b/vnet/vnet/devices/af_packet/node.c
index 0c608ea4..6e2ec46e 100644
--- a/vnet/vnet/devices/af_packet/node.c
+++ b/vnet/vnet/devices/af_packet/node.c
@@ -183,7 +183,6 @@ af_packet_device_input_fn  (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      clib_memcpy (vlib_buffer_get_current (b0), (u8 *) tph + tph->tp_mac + offset, bytes_to_copy);
 
 	      /* fill buffer header */
-	      b0->clone_count = 0;
 	      b0->current_length = bytes_to_copy;
 
 	      if (offset == 0)
diff --git a/vnet/vnet/devices/dpdk/device.c b/vnet/vnet/devices/dpdk/device.c
index f4d4fe77..b248f40f 100644
--- a/vnet/vnet/devices/dpdk/device.c
+++ b/vnet/vnet/devices/dpdk/device.c
@@ -672,10 +672,12 @@ dpdk_interface_tx (vlib_main_t * vm,
       mb0 = rte_mbuf_from_vlib_buffer(b0);
       mb1 = rte_mbuf_from_vlib_buffer(b1);
 
-      any_clone = b0->clone_count | b1->clone_count;
+      any_clone = (b0->flags & VLIB_BUFFER_RECYCLE)
+          | (b1->flags & VLIB_BUFFER_RECYCLE);
       if (PREDICT_FALSE(any_clone != 0))
         {
-          if (PREDICT_FALSE(b0->clone_count != 0))
+            if (PREDICT_FALSE
+                ((b0->flags & VLIB_BUFFER_RECYCLE) != 0))
 	    {
 	      struct rte_mbuf * mb0_new = dpdk_replicate_packet_mb (b0);
 	      if (PREDICT_FALSE(mb0_new == 0))
@@ -688,7 +690,8 @@ dpdk_interface_tx (vlib_main_t * vm,
 		mb0 = mb0_new;
 	      vec_add1 (dm->recycle[my_cpu], bi0);
 	    }
-          if (PREDICT_FALSE(b1->clone_count != 0))
+          if (PREDICT_FALSE
+              ((b1->flags & VLIB_BUFFER_RECYCLE) != 0))
 	    {
 	      struct rte_mbuf * mb1_new = dpdk_replicate_packet_mb (b1);
 	      if (PREDICT_FALSE(mb1_new == 0))
@@ -772,7 +775,7 @@ dpdk_interface_tx (vlib_main_t * vm,
       b0 = vlib_get_buffer (vm, bi0);
 
       mb0 = rte_mbuf_from_vlib_buffer(b0);
-      if (PREDICT_FALSE(b0->clone_count != 0))
+      if (PREDICT_FALSE((b0->flags & VLIB_BUFFER_RECYCLE) != 0))
 	{
 	  struct rte_mbuf * mb0_new = dpdk_replicate_packet_mb (b0);
 	  if (PREDICT_FALSE(mb0_new == 0))
diff --git a/vnet/vnet/devices/dpdk/node.c b/vnet/vnet/devices/dpdk/node.c
index 0d453085..dc2a60e4 100644
--- a/vnet/vnet/devices/dpdk/node.c
+++ b/vnet/vnet/devices/dpdk/node.c
@@ -439,7 +439,6 @@ static inline u32 dpdk_device_input ( dpdk_main_t * dm,
             }
 
           vlib_buffer_init_for_free_list (b0, fl);
-          b0->clone_count = 0;
           
           bi0 = vlib_get_buffer_index (vm, b0);
 
@@ -490,7 +489,6 @@ static inline u32 dpdk_device_input ( dpdk_main_t * dm,
 
 	      b_seg = vlib_buffer_from_rte_mbuf(mb_seg);
 	      vlib_buffer_init_for_free_list (b_seg, fl);
-              b_seg->clone_count = 0;
 
 	      ASSERT((b_seg->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
 	      ASSERT(b_seg->current_data == 0);
diff --git a/vnet/vnet/devices/netmap/node.c b/vnet/vnet/devices/netmap/node.c
index f4c39e62..eae189c0 100644
--- a/vnet/vnet/devices/netmap/node.c
+++ b/vnet/vnet/devices/netmap/node.c
@@ -183,7 +183,6 @@ netmap_device_input_fn  (vlib_main_t * vm, vlib_node_runtime_t * node,
 			  bytes_to_copy);
 
 		  /* fill buffer header */
-		  b0->clone_count = 0;
 		  b0->current_length = bytes_to_copy;
 
 		  if (offset == 0)
diff --git a/vnet/vnet/devices/ssvm/node.c b/vnet/vnet/devices/ssvm/node.c
index 57b5fd22..b182fef9 100644
--- a/vnet/vnet/devices/ssvm/node.c
+++ b/vnet/vnet/devices/ssvm/node.c
@@ -166,7 +166,6 @@ ssvm_eth_device_input (ssvm_eth_main_t * em,
           while (1)
             {
               vlib_buffer_init_for_free_list (b0, fl);
-              b0->clone_count = 0;
               
               b0->current_data = elt->current_data_hint;
               b0->current_length = elt->length_this_buffer;
diff --git a/vnet/vnet/mcast/mcast.c b/vnet/vnet/mcast/mcast.c
index e9177c71..55be89ae 100644
--- a/vnet/vnet/mcast/mcast.c
+++ b/vnet/vnet/mcast/mcast.c
@@ -193,7 +193,8 @@ mcast_prep_node_fn (vlib_main_t * vm,
               /* 
                * Make sure that intermediate "frees" don't screw up 
                */
-              b0->clone_count = vec_len (g0->members);
+              b0->recycle_count = vec_len (g0->members);
+              b0->flags |= VLIB_BUFFER_RECYCLE;
 
               /* Set up for the recycle node */
               vnet_buffer(b0)->mcast.mcast_current_index = 1;
@@ -394,11 +395,12 @@ mcast_recycle_node_fn (vlib_main_t * vm,
                                   vnet_buffer(b0)->mcast.mcast_group_index);
 
           /* No more replicas? */
-          if (b0->clone_count == 1)
+          if (b0->recycle_count == 1)
             {
               /* Restore the original free list index */
               b0->free_list_index = 
                 vnet_buffer(b0)->mcast.original_free_list_index;
+              b0->flags &= ~(VLIB_BUFFER_RECYCLE);
             }
           current_member0 = vnet_buffer(b0)->mcast.mcast_current_index;
           
diff --git a/vnet/vnet/replication.c b/vnet/vnet/replication.c
index 4e12f0b8..999e1b12 100644
--- a/vnet/vnet/replication.c
+++ b/vnet/vnet/replication.c
@@ -45,13 +45,13 @@ replication_prep (vlib_main_t * vm,
   ctx_id = ctx - rm->contexts[cpu_number];
 
   // Save state from vlib buffer
-  ctx->saved_clone_count = b0->clone_count;
   ctx->saved_free_list_index = b0->free_list_index;
   ctx->current_data = b0->current_data;
 
   // Set up vlib buffer hooks
-  b0->clone_count = ctx_id;
+  b0->recycle_count = ctx_id;
   b0->free_list_index = rm->recycle_list_index;
+  b0->flags |= VLIB_BUFFER_RECYCLE;
 
   // Save feature state
   ctx->recycle_node_index = recycle_node_index;
@@ -95,7 +95,7 @@ replication_recycle (vlib_main_t * vm,
   ip4_header_t * ip;
 
   // Get access to the replication context
-  ctx = pool_elt_at_index (rm->contexts[cpu_number], b0->clone_count);
+  ctx = pool_elt_at_index (rm->contexts[cpu_number], b0->recycle_count);
 
   // Restore vnet buffer state
   clib_memcpy (vnet_buffer(b0), ctx->vnet_buffer, sizeof(vnet_buffer_opaque_t));
@@ -121,7 +121,6 @@ replication_recycle (vlib_main_t * vm,
   if (is_last) {
     // This is the last replication in the list. 
     // Restore original buffer free functionality.
-    b0->clone_count = ctx->saved_clone_count;
     b0->free_list_index = ctx->saved_free_list_index;
 
     // Free context back to its pool
@@ -162,12 +161,12 @@ static void replication_recycle_callback (vlib_main_t *vm,
     bi0 = fl->aligned_buffers[0];
     b0 = vlib_get_buffer (vm, bi0);
     ctx = pool_elt_at_index (rm->contexts[cpu_number],
-                             b0->clone_count);
+                             b0->recycle_count);
     feature_node_index = ctx->recycle_node_index;
   } else if (vec_len (fl->unaligned_buffers) > 0) {
     bi0 = fl->unaligned_buffers[0];
     b0 = vlib_get_buffer (vm, bi0);
-    ctx = pool_elt_at_index (rm->contexts[cpu_number], b0->clone_count);
+    ctx = pool_elt_at_index (rm->contexts[cpu_number], b0->recycle_count);
     feature_node_index = ctx->recycle_node_index;
   }
 
diff --git a/vnet/vnet/replication.h b/vnet/vnet/replication.h
index 9de5717f..b16d5dc4 100644
--- a/vnet/vnet/replication.h
+++ b/vnet/vnet/replication.h
@@ -36,7 +36,6 @@ typedef struct {
   u32  recycle_node_index;   // feature's recycle node index
 
   // data saved from the start of replication and restored at the end of replication
-  u32  saved_clone_count;     // from vlib buffer
   u32  saved_free_list_index; // from vlib buffer
 
   // data saved from the original packet and restored for each replica
@@ -93,7 +92,7 @@ replication_get_ctx (vlib_buffer_t * b0)
   replication_main_t * rm = &replication_main;
 
   return replication_is_recycled (b0) ? 
-   pool_elt_at_index (rm->contexts[os_get_cpu_number()], b0->clone_count) :
+   pool_elt_at_index (rm->contexts[os_get_cpu_number()], b0->recycle_count) :
    0;
 }
 
diff --git a/vnet/vnet/unix/tapcli.c b/vnet/vnet/unix/tapcli.c
index 7856b057..bb280db9 100644
--- a/vnet/vnet/unix/tapcli.c
+++ b/vnet/vnet/unix/tapcli.c
@@ -261,7 +261,6 @@ static uword tapcli_rx_iface(vlib_main_t * vm,
     vec_validate (tm->iovecs, tm->mtu_buffers - 1);
     for (j = 0; j < tm->mtu_buffers; j++) {
       b = vlib_get_buffer (vm, tm->rx_buffers[i_rx - j]);
-      b->clone_count = 0;
       tm->iovecs[j].iov_base = b->data;
       tm->iovecs[j].iov_len = buffer_size;
     }