Emacs-lisp scripts to generate complete vpp plugins

Change-Id: Id71147a8d5e30aadfb90dc10ea9468cf36ef23a8
Signed-off-by: Dave Barach <dave@barachs.net>

1 files changed, 295 insertions, 0 deletions

diff --git a/build-root/emacs-lisp/plugin-node-skel.el b/build-root/emacs-lisp/plugin-node-skel.el
new file mode 100644
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+++ b/build-root/emacs-lisp/plugin-node-skel.el
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+;;; plugin-node-skel.el - vpp engine plug-in "node.c" skeleton
+;;;
+;;; Copyright (c) 2016 Cisco and/or its affiliates.
+;;; Licensed under the Apache License, Version 2.0 (the "License");
+;;; you may not use this file except in compliance with the License.
+;;; You may obtain a copy of the License at:
+;;;
+;;;     http://www.apache.org/licenses/LICENSE-2.0
+;;;
+;;; Unless required by applicable law or agreed to in writing, software
+;;; distributed under the License is distributed on an "AS IS" BASIS,
+;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;;; See the License for the specific language governing permissions and
+;;; limitations under the License.
+
+(require 'skeleton)
+
+(define-skeleton plugin-node-skel
+"Insert a plug-in 'node.c' skeleton "
+nil
+'(if (not (boundp 'plugin-name))
+     (setq plugin-name (read-string "Plugin name: ")))
+'(setq PLUGIN-NAME (upcase plugin-name))
+"
+/*
+ * node.c - skeleton vpp engine plug-in dual-loop node skeleton
+ *
+ * Copyright (c) <current-year> <your-organization>
+ * Licensed under the Apache License, Version 2.0 (the \"License\");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an \"AS IS\" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vppinfra/error.h>
+#include <" plugin-name "/" plugin-name ".h>
+
+typedef struct {
+  u32 next_index;
+  u32 sw_if_index;
+} " plugin-name "_trace_t;
+
+/* packet trace format function */
+static u8 * format_" plugin-name "_trace (u8 * s, va_list * args)
+{
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  " plugin-name "_trace_t * t = va_arg (*args, " plugin-name "_trace_t *);
+  
+  s = format (s, \"" PLUGIN-NAME ": sw_if_index %d, next index %d\",
+              t->sw_if_index, t->next_index);
+  return s;
+}
+
+vlib_node_registration_t " plugin-name "_node;
+
+#define foreach_" plugin-name "_error \\
+_(SWAPPED, \"Mac swap packets processed\")
+
+typedef enum {
+#define _(sym,str) " PLUGIN-NAME "_ERROR_##sym,
+  foreach_" plugin-name "_error
+#undef _
+  " PLUGIN-NAME "_N_ERROR,
+} " plugin-name "_error_t;
+
+static char * " plugin-name "_error_strings[] = {
+#define _(sym,string) string,
+  foreach_" plugin-name "_error
+#undef _
+};
+
+typedef enum {
+  " PLUGIN-NAME "_NEXT_INTERFACE_OUTPUT,
+  " PLUGIN-NAME "_N_NEXT,
+} " plugin-name "_next_t;
+
+#define foreach_mac_address_offset              \\
+_(0)                                            \\
+_(1)                                            \\
+_(2)                                            \\
+_(3)                                            \\
+_(4)                                            \\
+_(5)
+
+static uword
+" plugin-name "_node_fn (vlib_main_t * vm,
+		  vlib_node_runtime_t * node,
+		  vlib_frame_t * frame)
+{
+  u32 n_left_from, * from, * to_next;
+  " plugin-name "_next_t next_index;
+  u32 pkts_swapped = 0;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index,
+			   to_next, n_left_to_next);
+
+      while (n_left_from >= 4 && n_left_to_next >= 2)
+	{
+          u32 next0 = " PLUGIN-NAME "_NEXT_INTERFACE_OUTPUT;
+          u32 next1 = " PLUGIN-NAME "_NEXT_INTERFACE_OUTPUT;
+          u32 sw_if_index0, sw_if_index1;
+          u8 tmp0[6], tmp1[6];
+          ethernet_header_t *en0, *en1;
+          u32 bi0, bi1;
+	  vlib_buffer_t * b0, * b1;
+          
+	  /* Prefetch next iteration. */
+	  {
+	    vlib_buffer_t * p2, * p3;
+            
+	    p2 = vlib_get_buffer (vm, from[2]);
+	    p3 = vlib_get_buffer (vm, from[3]);
+            
+	    vlib_prefetch_buffer_header (p2, LOAD);
+	    vlib_prefetch_buffer_header (p3, LOAD);
+
+	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+	  }
+
+          /* speculatively enqueue b0 and b1 to the current next frame */
+	  to_next[0] = bi0 = from[0];
+	  to_next[1] = bi1 = from[1];
+	  from += 2;
+	  to_next += 2;
+	  n_left_from -= 2;
+	  n_left_to_next -= 2;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  b1 = vlib_get_buffer (vm, bi1);
+
+          ASSERT (b0->current_data == 0);
+          ASSERT (b1->current_data == 0);
+          
+          en0 = vlib_buffer_get_current (b0);
+          en1 = vlib_buffer_get_current (b1);
+
+          /* This is not the fastest way to swap src + dst mac addresses */
+#define _(a) tmp0[a] = en0->src_address[a];
+          foreach_mac_address_offset;
+#undef _
+#define _(a) en0->src_address[a] = en0->dst_address[a];
+          foreach_mac_address_offset;
+#undef _
+#define _(a) en0->dst_address[a] = tmp0[a];
+          foreach_mac_address_offset;
+#undef _
+
+#define _(a) tmp1[a] = en1->src_address[a];
+          foreach_mac_address_offset;
+#undef _
+#define _(a) en1->src_address[a] = en1->dst_address[a];
+          foreach_mac_address_offset;
+#undef _
+#define _(a) en1->dst_address[a] = tmp1[a];
+          foreach_mac_address_offset;
+#undef _
+
+
+
+          sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+          sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
+
+          /* Send pkt back out the RX interface */
+          vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
+          vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;
+
+          pkts_swapped += 2;
+
+          if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
+            {
+              if (b0->flags & VLIB_BUFFER_IS_TRACED) 
+                {
+                    " plugin-name "_trace_t *t = 
+                      vlib_add_trace (vm, node, b0, sizeof (*t));
+                    t->sw_if_index = sw_if_index0;
+                    t->next_index = next0;
+                  }
+                if (b1->flags & VLIB_BUFFER_IS_TRACED) 
+                  {
+                    " plugin-name "_trace_t *t = 
+                      vlib_add_trace (vm, node, b1, sizeof (*t));
+                    t->sw_if_index = sw_if_index1;
+                    t->next_index = next1;
+                  }
+              }
+            
+            /* verify speculative enqueues, maybe switch current next frame */
+            vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+                                             to_next, n_left_to_next,
+                                             bi0, bi1, next0, next1);
+        }
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+          u32 bi0;
+	  vlib_buffer_t * b0;
+          u32 next0 = " PLUGIN-NAME "_NEXT_INTERFACE_OUTPUT;
+          u32 sw_if_index0;
+          u8 tmp0[6];
+          ethernet_header_t *en0;
+
+          /* speculatively enqueue b0 to the current next frame */
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+          /* 
+           * Direct from the driver, we should be at offset 0
+           * aka at &b0->data[0]
+           */
+          ASSERT (b0->current_data == 0);
+          
+          en0 = vlib_buffer_get_current (b0);
+
+          /* This is not the fastest way to swap src + dst mac addresses */
+#define _(a) tmp0[a] = en0->src_address[a];
+          foreach_mac_address_offset;
+#undef _
+#define _(a) en0->src_address[a] = en0->dst_address[a];
+          foreach_mac_address_offset;
+#undef _
+#define _(a) en0->dst_address[a] = tmp0[a];
+          foreach_mac_address_offset;
+#undef _
+
+          sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+
+          /* Send pkt back out the RX interface */
+          vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
+
+          if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) 
+                            && (b0->flags & VLIB_BUFFER_IS_TRACED))) {
+            " plugin-name "_trace_t *t = 
+               vlib_add_trace (vm, node, b0, sizeof (*t));
+            t->sw_if_index = sw_if_index0;
+            t->next_index = next0;
+            }
+            
+          pkts_swapped += 1;
+
+          /* verify speculative enqueue, maybe switch current next frame */
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   bi0, next0);
+	}
+
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+
+  vlib_node_increment_counter (vm, " plugin-name "_node.index, 
+                               " PLUGIN-NAME "_ERROR_SWAPPED, pkts_swapped);
+  return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (" plugin-name "_node) = {
+  .function = " plugin-name "_node_fn,
+  .name = \"" plugin-name "\",
+  .vector_size = sizeof (u32),
+  .format_trace = format_" plugin-name "_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  
+  .n_errors = ARRAY_LEN(" plugin-name "_error_strings),
+  .error_strings = " plugin-name "_error_strings,
+
+  .n_next_nodes = " PLUGIN-NAME "_N_NEXT,
+
+  /* edit / add dispositions here */
+  .next_nodes = {
+        [" PLUGIN-NAME "_NEXT_INTERFACE_OUTPUT] = \"interface-output\",
+  },
+};
+")