--- /dev/null
+;;; 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 skel-plugin-node
+"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))
+'(setq capital-oh-en "ON")
+"/*
+ * 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;
+ u8 new_src_mac[6];
+ u8 new_dst_mac[6];
+} " plugin-name "_trace_t;
+
+static u8 *
+format_mac_address (u8 * s, va_list * args)
+{
+ u8 *a = va_arg (*args, u8 *);
+ return format (s, \"%02x:%02x:%02x:%02x:%02x:%02x\",
+ a[0], a[1], a[2], a[3], a[4], a[5]);
+}
+
+/* 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\\n\",
+ t->sw_if_index, t->next_index);
+ s = format (s, \" new src %U -> new dst %U\",
+ format_mac_address, t->new_src_mac,
+ format_mac_address, t->new_dst_mac);
+ 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;
+ clib_memcpy (t->new_src_mac, en0->src_address,
+ sizeof (t->new_src_mac));
+ clib_memcpy (t->new_dst_mac, en0->dst_address,
+ sizeof (t->new_dst_mac));
+ }
+ 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;
+ clib_memcpy (t->new_src_mac, en1->src_address,
+ sizeof (t->new_src_mac));
+ clib_memcpy (t->new_dst_mac, en1->dst_address,
+ sizeof (t->new_dst_mac));
+ }
+ }
+
+ /* 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;
+ clib_memcpy (t->new_src_mac, en0->src_address,
+ sizeof (t->new_src_mac));
+ clib_memcpy (t->new_dst_mac, en0->dst_address,
+ sizeof (t->new_dst_mac));
+ }
+
+ 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;
+}
+
+/* *INDENT-OFF* */
+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\",
+ },
+};
+/* *INDENT-ON* */
+/*
+ * fd.io coding-style-patch-verification: " capital-oh-en "
+ *
+ * Local Variables:
+ * eval: (c-set-style \"gnu\")
+ * End:
+ */
+")
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