IPSEC: tunnel-input; don't load the HW interface struct

also fix the stats to include all the data in the tunnel.
And don't load the SA.

Change-Id: I7cd2e8d879f19683175fd0de78a606a2836e6da2
Signed-off-by: Neale Ranns <nranns@cisco.com>

4 files changed, 41 insertions, 43 deletions

diff --git a/src/vnet/ipsec/ipsec.h b/src/vnet/ipsec/ipsec.h
index 78d000030c9..3279fab6701 100644
--- a/src/vnet/ipsec/ipsec.h
+++ b/src/vnet/ipsec/ipsec.h
@@ -140,6 +140,7 @@ typedef struct
   uword *sa_index_by_sa_id;
   uword *ipsec_if_pool_index_by_key;
   uword *ipsec_if_real_dev_by_show_dev;
+  u32 *ipsec_if_by_sw_if_index;
 
   /* node indices */
   u32 error_drop_node_index;
diff --git a/src/vnet/ipsec/ipsec_if.c b/src/vnet/ipsec/ipsec_if.c
index 3ec4b0b460c..d03d1a9ffe3 100644
--- a/src/vnet/ipsec/ipsec_if.c
+++ b/src/vnet/ipsec/ipsec_if.c
@@ -70,6 +70,17 @@ format_ipsec_if_tx_trace (u8 * s, va_list * args)
   return s;
 }
 
+always_inline ipsec_tunnel_if_t *
+ipsec_tun_get_by_sw_if_index (u32 sw_if_index)
+{
+  ipsec_main_t *im = &ipsec_main;
+  u32 ti;
+
+  ti = im->ipsec_if_by_sw_if_index[sw_if_index];
+
+  return (pool_elt_at_index (im->tunnel_interfaces, ti));
+}
+
 static uword
 ipsec_if_tx_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		     vlib_frame_t * from_frame)
@@ -94,10 +105,9 @@ ipsec_if_tx_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 
       while (n_left_from > 0 && n_left_to_next > 0)
 	{
+	  const ipsec_tunnel_if_t *t0;
 	  u32 bi0, next0, len0;
 	  vlib_buffer_t *b0;
-	  ipsec_tunnel_if_t *t0;
-	  vnet_hw_interface_t *hi0;
 
 	  bi0 = to_next[0] = from[0];
 	  from += 1;
@@ -106,8 +116,7 @@ ipsec_if_tx_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 	  n_left_to_next -= 1;
 	  b0 = vlib_get_buffer (vm, bi0);
 	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
-	  hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
-	  t0 = pool_elt_at_index (im->tunnel_interfaces, hi0->dev_instance);
+	  t0 = ipsec_tun_get_by_sw_if_index (sw_if_index0);
 	  vnet_buffer (b0)->ipsec.sad_index = t0->output_sa_index;
 
 	  /* 0, tx-node next[0] was added by vlib_node_add_next_with_slot */
@@ -170,6 +179,7 @@ ipsec_admin_up_down_function (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
 
   hi = vnet_get_hw_interface (vnm, hw_if_index);
   t = pool_elt_at_index (im->tunnel_interfaces, hi->hw_instance);
+  t->flags = flags;
 
   if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
     {
@@ -290,8 +300,7 @@ ipsec_add_del_tunnel_if_internal (vnet_main_t * vnm,
       if (p)
 	return VNET_API_ERROR_INVALID_VALUE;
 
-      pool_get_aligned (im->tunnel_interfaces, t, CLIB_CACHE_LINE_BYTES);
-      clib_memset (t, 0, sizeof (*t));
+      pool_get_aligned_zero (im->tunnel_interfaces, t, CLIB_CACHE_LINE_BYTES);
 
       dev_instance = t - im->tunnel_interfaces;
       if (args->renumber)
@@ -373,6 +382,11 @@ ipsec_add_del_tunnel_if_internal (vnet_main_t * vnm,
       ASSERT (slot == 0);
 
       t->hw_if_index = hw_if_index;
+      t->sw_if_index = hi->sw_if_index;
+
+      vec_validate_init_empty (im->ipsec_if_by_sw_if_index,
+			       t->sw_if_index, ~0);
+      im->ipsec_if_by_sw_if_index[t->sw_if_index] = t - im->tunnel_interfaces;
 
       vnet_feature_enable_disable ("interface-output", "ipsec-if-output",
 				   hi->sw_if_index, 1, 0, 0);
@@ -400,6 +414,7 @@ ipsec_add_del_tunnel_if_internal (vnet_main_t * vnm,
 
       hash_unset (im->ipsec_if_pool_index_by_key, key);
       hash_unset (im->ipsec_if_real_dev_by_show_dev, t->show_instance);
+      im->ipsec_if_by_sw_if_index[t->sw_if_index] = ~0;
 
       pool_put (im->tunnel_interfaces, t);
 
@@ -599,7 +614,6 @@ ipsec_set_interface_sa (vnet_main_t * vnm, u32 hw_if_index, u32 sa_id,
   return 0;
 }
 
-
 clib_error_t *
 ipsec_tunnel_if_init (vlib_main_t * vm)
 {
diff --git a/src/vnet/ipsec/ipsec_if.h b/src/vnet/ipsec/ipsec_if.h
index 67d5554e777..3d042f0af01 100644
--- a/src/vnet/ipsec/ipsec_if.h
+++ b/src/vnet/ipsec/ipsec_if.h
@@ -33,6 +33,8 @@ typedef struct
   u32 input_sa_index;
   u32 output_sa_index;
   u32 hw_if_index;
+  u32 sw_if_index;
+  vnet_hw_interface_flags_t flags;
   u32 show_instance;
 } ipsec_tunnel_if_t;
 
diff --git a/src/vnet/ipsec/ipsec_if_in.c b/src/vnet/ipsec/ipsec_if_in.c
index ffa9c8e515d..c7f5735a64e 100644
--- a/src/vnet/ipsec/ipsec_if_in.c
+++ b/src/vnet/ipsec/ipsec_if_in.c
@@ -68,14 +68,11 @@ VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
   ipsec_main_t *im = &ipsec_main;
   vnet_main_t *vnm = im->vnet_main;
   vnet_interface_main_t *vim = &vnm->interface_main;
-  ipsec_proto_main_t *em = &ipsec_proto_main;
   u32 *from, *to_next = 0, next_index;
   u32 n_left_from, last_sw_if_index = ~0;
   u32 thread_index = vm->thread_index;
   u64 n_bytes = 0, n_packets = 0;
-  u8 icv_len;
-  ipsec_tunnel_if_t *last_t = NULL;
-  ipsec_sa_t *sa0;
+  const ipsec_tunnel_if_t *last_t = NULL;
   vlib_combined_counter_main_t *rx_counter;
   vlib_combined_counter_main_t *drop_counter;
   u32 n_disabled = 0, n_no_tunnel = 0;
@@ -96,9 +93,9 @@ VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
       while (n_left_from > 0 && n_left_to_next > 0)
 	{
 	  u32 bi0, next0, sw_if_index0;
+	  const esp_header_t *esp0;
+	  const ip4_header_t *ip0;
 	  vlib_buffer_t *b0;
-	  ip4_header_t *ip0;
-	  esp_header_t *esp0;
 	  uword *p;
 	  u32 len0;
 
@@ -109,7 +106,7 @@ VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
 	  n_left_to_next -= 1;
 	  b0 = vlib_get_buffer (vm, bi0);
 	  ip0 = vlib_buffer_get_current (b0);
-	  esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
+	  esp0 = (const esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 
 	  next0 = IPSEC_INPUT_NEXT_DROP;
 
@@ -117,24 +114,26 @@ VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
 
 	  p = hash_get (im->ipsec_if_pool_index_by_key, key);
 
+	  /* stats for the tunnel include all the data after the IP header
+	     just like a norml IP-IP tunnel */
+	  vlib_buffer_advance (b0, ip4_header_bytes (ip0));
 	  len0 = vlib_buffer_length_in_chain (vm, b0);
 
-	  if (p)
+	  if (PREDICT_TRUE (NULL != p))
 	    {
-	      ipsec_tunnel_if_t *t;
-	      t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
-	      vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
-	      if (t->hw_if_index != ~0)
-		{
-		  vnet_hw_interface_t *hi;
+	      const ipsec_tunnel_if_t *t0;
+
+	      t0 = pool_elt_at_index (im->tunnel_interfaces, p[0]);
+	      vnet_buffer (b0)->ipsec.sad_index = t0->input_sa_index;
 
+	      if (PREDICT_TRUE (t0->hw_if_index != ~0))
+		{
 		  vnet_buffer (b0)->ipsec.flags = 0;
-		  hi = vnet_get_hw_interface (vnm, t->hw_if_index);
-		  sw_if_index0 = hi->sw_if_index;
+		  sw_if_index0 = t0->sw_if_index;
 		  vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
 
 		  if (PREDICT_FALSE
-		      (!(hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
+		      (!(t0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
 		    {
 		      vlib_increment_combined_counter
 			(drop_counter, thread_index, sw_if_index0, 1, len0);
@@ -150,17 +149,6 @@ VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
 		    }
 		  else
 		    {
-		      sa0 = pool_elt_at_index (im->sad, t->input_sa_index);
-		      icv_len =
-			em->ipsec_proto_main_integ_algs[sa0->
-							integ_alg].trunc_size;
-
-		      /* length = packet length - ESP/tunnel overhead */
-		      n_bytes -= n_packets * (sizeof (ip4_header_t) +
-					      sizeof (esp_header_t) +
-					      sizeof (esp_footer_t) +
-					      16 /* aes-cbc IV */  + icv_len);
-
 		      if (last_t)
 			{
 			  vlib_increment_combined_counter
@@ -169,7 +157,7 @@ VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
 			}
 
 		      last_sw_if_index = sw_if_index0;
-		      last_t = t;
+		      last_t = t0;
 		      n_packets = 1;
 		      n_bytes = len0;
 		    }
@@ -179,7 +167,6 @@ VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
 		  vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
 		}
 
-	      vlib_buffer_advance (b0, ip4_header_bytes (ip0));
 	      next0 = im->esp4_decrypt_next_index;
 	    }
 	  else
@@ -205,12 +192,6 @@ VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
 
   if (last_t)
     {
-      sa0 = pool_elt_at_index (im->sad, last_t->input_sa_index);
-      icv_len = em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
-
-      n_bytes -= n_packets * (sizeof (ip4_header_t) + sizeof (esp_header_t) +
-			      sizeof (esp_footer_t) + 16 /* aes-cbc IV */  +
-			      icv_len);
       vlib_increment_combined_counter (rx_counter,
 				       thread_index,
 				       last_sw_if_index, n_packets, n_bytes);