ip: apply dual loop unrolling in ip4_input

[vpp.git] / src / vnet / ip / ip4_input.c

diff --git a/src/vnet/ip/ip4_input.c b/src/vnet/ip/ip4_input.c
index 15c2ebf..94c4aac 100644 (file)
--- a/src/vnet/ip/ip4_input.c
+++ b/src/vnet/ip/ip4_input.c
@@ -41,13 +41,13 @@
 #include <vnet/ethernet/ethernet.h>
 #include <vnet/ppp/ppp.h>
 #include <vnet/hdlc/hdlc.h>
+#include <vnet/util/throttle.h>
 
 typedef struct
 {
   u8 packet_data[64];
 } ip4_input_trace_t;
 
-#ifndef CLIB_MARCH_VARIANT
 static u8 *
 format_ip4_input_trace (u8 * s, va_list * va)
 {
@@ -60,7 +60,6 @@ format_ip4_input_trace (u8 * s, va_list * va)
 
   return s;
 }
-#endif
 
 static_always_inline u32
 ip4_input_set_next (u32 sw_if_index, vlib_buffer_t * b, int arc_enabled)
@@ -152,6 +151,7 @@ ip4_input_inline (vlib_main_t * vm,
   vlib_get_buffers (vm, from, bufs, n_left_from);
   b = bufs;
   next = nexts;
+#if (CLIB_N_PREFETCHES >= 8)
   while (n_left_from >= 4)
     {
       u32 x = 0;
@@ -164,10 +164,10 @@ ip4_input_inline (vlib_main_t * vm,
          vlib_prefetch_buffer_header (b[10], LOAD);
          vlib_prefetch_buffer_header (b[11], LOAD);
 
-         CLIB_PREFETCH (b[4]->data, sizeof (ip4_header_t), LOAD);
-         CLIB_PREFETCH (b[5]->data, sizeof (ip4_header_t), LOAD);
-         CLIB_PREFETCH (b[6]->data, sizeof (ip4_header_t), LOAD);
-         CLIB_PREFETCH (b[7]->data, sizeof (ip4_header_t), LOAD);
+         vlib_prefetch_buffer_data (b[4], LOAD);
+         vlib_prefetch_buffer_data (b[5], LOAD);
+         vlib_prefetch_buffer_data (b[6], LOAD);
+         vlib_prefetch_buffer_data (b[7], LOAD);
        }
 
       vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = ~0;
@@ -234,6 +234,73 @@ ip4_input_inline (vlib_main_t * vm,
       next += 4;
       n_left_from -= 4;
     }
+#elif (CLIB_N_PREFETCHES >= 4)
+  while (n_left_from >= 2)
+    {
+      u32 x = 0;
+      u32 next0, next1;
+
+      /* Prefetch next iteration. */
+      if (n_left_from >= 6)
+       {
+         vlib_prefetch_buffer_header (b[4], LOAD);
+         vlib_prefetch_buffer_header (b[5], LOAD);
+
+         vlib_prefetch_buffer_data (b[2], LOAD);
+         vlib_prefetch_buffer_data (b[3], LOAD);
+       }
+
+      vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = ~0;
+      vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = ~0;
+
+      sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
+      sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
+
+      x |= sw_if_index[0] ^ last_sw_if_index;
+      x |= sw_if_index[1] ^ last_sw_if_index;
+
+      if (PREDICT_TRUE (x == 0))
+       {
+         /* we deal with 2 more packets sharing the same sw_if_index
+            with the previous one, so we can optimize */
+         cnt += 2;
+         if (arc_enabled)
+           {
+             next0 = ip4_input_set_next (sw_if_index[0], b[0], 1);
+             next1 = ip4_input_set_next (sw_if_index[1], b[1], 1);
+           }
+         else
+           {
+             next0 = ip4_input_set_next (sw_if_index[0], b[0], 0);
+             next1 = ip4_input_set_next (sw_if_index[1], b[1], 0);
+           }
+       }
+      else
+       {
+         ip4_input_check_sw_if_index (vm, cm, sw_if_index[0],
+                                      &last_sw_if_index, &cnt, &arc_enabled);
+         ip4_input_check_sw_if_index (vm, cm, sw_if_index[1],
+                                      &last_sw_if_index, &cnt, &arc_enabled);
+
+         next0 = ip4_input_set_next (sw_if_index[0], b[0], 1);
+         next1 = ip4_input_set_next (sw_if_index[1], b[1], 1);
+       }
+
+      ip[0] = vlib_buffer_get_current (b[0]);
+      ip[1] = vlib_buffer_get_current (b[1]);
+
+      ip4_input_check_x2 (vm, error_node, b[0], b[1], ip[0], ip[1],
+                         &next0, &next1, verify_checksum);
+      next[0] = (u16) next0;
+      next[1] = (u16) next1;
+
+      /* next */
+      b += 2;
+      next += 2;
+      n_left_from -= 2;
+    }
+#endif
+
   while (n_left_from)
     {
       u32 next0;
@@ -312,11 +379,13 @@ char *ip4_error_strings[] = {
   foreach_ip4_error
 #undef _
 };
+#endif
 
 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ip4_input_node) = {
   .name = "ip4-input",
   .vector_size = sizeof (u32),
+  .protocol_hint = VLIB_NODE_PROTO_HINT_IP4,
 
   .n_errors = IP4_N_ERROR,
   .error_strings = ip4_error_strings,
@@ -340,17 +409,7 @@ VLIB_REGISTER_NODE (ip4_input_no_checksum_node) = {
   .name = "ip4-input-no-checksum",
   .vector_size = sizeof (u32),
 
-  .n_next_nodes = IP4_INPUT_N_NEXT,
-  .next_nodes = {
-    [IP4_INPUT_NEXT_DROP] = "error-drop",
-    [IP4_INPUT_NEXT_PUNT] = "error-punt",
-    [IP4_INPUT_NEXT_OPTIONS] = "ip4-options",
-    [IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
-    [IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-mfib-forward-lookup",
-    [IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
-    [IP4_INPUT_NEXT_REASSEMBLY] = "ip4-reassembly",
-  },
-
+  .sibling_of = "ip4-input",
   .format_buffer = format_ip4_header,
   .format_trace = format_ip4_input_trace,
 };
@@ -366,6 +425,7 @@ ip4_init (vlib_main_t * vm)
   hdlc_register_input_protocol (vm, HDLC_PROTOCOL_ip4, ip4_input_node.index);
 
   {
+    extern vlib_node_registration_t ip4_input_no_checksum_node;
     pg_node_t *pn;
     pn = pg_get_node (ip4_input_node.index);
     pn->unformat_edit = unformat_pg_ip4_header;
@@ -393,7 +453,20 @@ ip4_init (vlib_main_t * vm)
 }
 
 VLIB_INIT_FUNCTION (ip4_init);
-#endif
+
+static clib_error_t *
+ip4_main_loop_enter (vlib_main_t * vm)
+{
+  ip4_main_t *im = &ip4_main;
+  vlib_thread_main_t *tm = &vlib_thread_main;
+  u32 n_vlib_mains = tm->n_vlib_mains;
+
+  throttle_init (&im->arp_throttle, n_vlib_mains, 1e-3);
+
+  return (NULL);
+}
+
+VLIB_MAIN_LOOP_ENTER_FUNCTION (ip4_main_loop_enter);
 
 /*
  * fd.io coding-style-patch-verification: ON