--- /dev/null
+;;; dual-loop-skel.el - Eliotic dual-loop node skeleton
+
+(require 'skeleton)
+
+(define-skeleton skel-dual-loop
+"Insert a skeleton dual-loop graph node"
+nil
+'(setq node-name (skeleton-read "Node Name: "))
+'(setq uc-node-name (upcase node-name))
+"
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+typedef struct {
+ /* convenience */
+ vlib_main_t * vlib_main;
+ vnet_main_t * vnet_main;
+ ethernet_main_t * ethernet_main;
+} " node-name "_main_t;
+
+" node-name "_main_t " node-name "_main;
+
+vlib_node_registration_t " node-name "_node;
+
+typedef struct {
+ u32 next_index;
+ u32 sw_if_index;
+} " node-name "_trace_t;
+
+/* packet trace format function */
+static u8 * format_" node-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 *);
+ " node-name "_trace_t * t = va_arg (*args, " node-name "_trace_t *);
+
+ s = format (s, \"" uc-node-name ": sw_if_index %d, next index %d\",
+ t->sw_if_index, t->next_index);
+ return s;
+}
+
+vlib_node_registration_t " node-name "_node;
+
+#define foreach_" node-name "_error \\
+_(SWAPPED, \"Mac swap packets processed\")
+
+typedef enum {
+#define _(sym,str) " uc-node-name "_ERROR_##sym,
+ foreach_" node-name "_error
+#undef _
+ " uc-node-name "_N_ERROR,
+} " node-name "_error_t;
+
+static char * " node-name "_error_strings[] = {
+#define _(sym,string) string,
+ foreach_" node-name "_error
+#undef _
+};
+
+typedef enum {
+ " uc-node-name "_NEXT_INTERFACE_OUTPUT,
+ " uc-node-name "_N_NEXT,
+} " node-name "_next_t;
+
+#define foreach_mac_address_offset \\
+_(0) \\
+_(1) \\
+_(2) \\
+_(3) \\
+_(4) \\
+_(5)
+
+static uword
+" node-name "_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ " node-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 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
+ u32 next1 = " uc-node-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);
+
+ /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
+ ASSERT (b0->current_data == 0);
+ ASSERT (b1->current_data == 0);
+
+ en0 = vlib_buffer_get_current (b0);
+ en1 = vlib_buffer_get_current (b1);
+
+ /* This is not the fastest way to swap src + dst mac addresses */
+#define _(a) tmp0[a] = en0->src_address[a];
+ foreach_mac_address_offset;
+#undef _
+#define _(a) en0->src_address[a] = en0->dst_address[a];
+ foreach_mac_address_offset;
+#undef _
+#define _(a) en0->dst_address[a] = tmp0[a];
+ foreach_mac_address_offset;
+#undef _
+
+#define _(a) tmp1[a] = en1->src_address[a];
+ foreach_mac_address_offset;
+#undef _
+#define _(a) en1->src_address[a] = en1->dst_address[a];
+ foreach_mac_address_offset;
+#undef _
+#define _(a) en1->dst_address[a] = tmp1[a];
+ foreach_mac_address_offset;
+#undef _
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
+
+ /* Send pkt back out the RX interface */
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;
+
+ pkts_swapped += 2;
+ /* $$$$$ End of processing 2 x packets $$$$$ */
+
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
+ {
+ if (b0->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ " node-name "_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+ if (b1->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ " node-name "_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->sw_if_index = sw_if_index1;
+ t->next_index = next1;
+ }
+ }
+
+ /* verify speculative enqueues, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ u32 next0 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
+ u32 sw_if_index0;
+ u8 tmp0[6];
+ ethernet_header_t *en0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ /* $$$$$ Single loop: process 1 packet here $$$$$ */
+
+ /*
+ * Direct from the driver, we should be at offset 0
+ * aka at &b0->data[0]
+ */
+ ASSERT (b0->current_data == 0);
+
+ en0 = vlib_buffer_get_current (b0);
+
+ /* This is not the fastest way to swap src + dst mac addresses */
+#define _(a) tmp0[a] = en0->src_address[a];
+ foreach_mac_address_offset;
+#undef _
+#define _(a) en0->src_address[a] = en0->dst_address[a];
+ foreach_mac_address_offset;
+#undef _
+#define _(a) en0->dst_address[a] = tmp0[a];
+ foreach_mac_address_offset;
+#undef _
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+
+ /* Send pkt back out the RX interface */
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
+
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ " node-name "_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ pkts_swapped += 1;
+
+ /* $$$$$ Done processing 1 packet here $$$$$ */
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, " node-name "_node.index,
+ " uc-node-name "_ERROR_SWAPPED, pkts_swapped);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (" node-name "_node) = {
+ .function = " node-name "_node_fn,
+ .name = \"" node-name "\",
+ .vector_size = sizeof (u32),
+ .format_trace = format_" node-name "_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(" node-name "_error_strings),
+ .error_strings = " node-name "_error_strings,
+
+ .n_next_nodes = " uc-node-name "_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [" uc-node-name "_NEXT_INTERFACE_OUTPUT] = \"interface-output\",
+ },
+};
+
+clib_error_t *" node-name "_init (vlib_main_t *vm)
+{
+ " node-name "_main_t *msm = &" node-name "_main;
+
+ /* $$$$$ Initialize " node-name "_main_t structure here. $$$$$ */
+ msm->vlib_main = vm;
+ msm->vnet_main = vnet_get_main();
+ msm->ethernet_main = ethernet_get_main(vm);
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION(" node-name "_init);
+")
+
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