1 ;;; dual-loop-skel.el - Eliotic dual-loop node skeleton
5 (define-skeleton dual-loop-skel
6 "Insert a skeleton dual-loop graph node"
8 '(setq node-name (skeleton-read "Node Name: "))
9 '(setq uc-node-name (upcase node-name))
11 #include <vlib/vlib.h>
12 #include <vnet/vnet.h>
13 #include <vnet/pg/pg.h>
14 #include <clib/error.h>
16 #include <vnet/ip/ip.h>
17 #include <vnet/ethernet/ethernet.h>
19 #include <clib/hash.h>
20 #include <clib/error.h>
21 #include <clib/elog.h>
25 vlib_main_t * vlib_main;
26 vnet_main_t * vnet_main;
27 ethernet_main_t * ethernet_main;
28 } " node-name "_main_t;
30 " node-name "_main_t " node-name "_main;
32 vlib_node_registration_t " node-name "_node;
37 } " node-name "_trace_t;
39 /* packet trace format function */
40 static u8 * format_" node-name "_trace (u8 * s, va_list * args)
42 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
43 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
44 " node-name "_trace_t * t = va_arg (*args, " node-name "_trace_t *);
46 s = format (s, \"" uc-node-name ": sw_if_index %d, next index %d\",
47 t->sw_if_index, t->next_index);
51 vlib_node_registration_t " node-name "_node;
53 #define foreach_" node-name "_error \\
54 _(SWAPPED, \"Mac swap packets processed\")
57 #define _(sym,str) " uc-node-name "_ERROR_##sym,
58 foreach_" node-name "_error
60 " uc-node-name "_N_ERROR,
61 } " node-name "_error_t;
63 static char * " node-name "_error_strings[] = {
64 #define _(sym,string) string,
65 foreach_" node-name "_error
70 " uc-node-name "_NEXT_INTERFACE_OUTPUT,
71 " uc-node-name "_N_NEXT,
72 } " node-name "_next_t;
74 #define foreach_mac_address_offset \\
83 " node-name "_node_fn (vlib_main_t * vm,
84 vlib_node_runtime_t * node,
87 u32 n_left_from, * from, * to_next;
88 " node-name "_next_t next_index;
91 from = vlib_frame_vector_args (frame);
92 n_left_from = frame->n_vectors;
93 next_index = node->cached_next_index;
95 while (n_left_from > 0)
99 vlib_get_next_frame (vm, node, next_index,
100 to_next, n_left_to_next);
102 while (n_left_from >= 4 && n_left_to_next >= 2)
104 u32 next0 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
105 u32 next1 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
106 u32 sw_if_index0, sw_if_index1;
108 ethernet_header_t *en0, *en1;
110 vlib_buffer_t * b0, * b1;
112 /* Prefetch next iteration. */
114 vlib_buffer_t * p2, * p3;
116 p2 = vlib_get_buffer (vm, from[2]);
117 p3 = vlib_get_buffer (vm, from[3]);
119 vlib_prefetch_buffer_header (p2, LOAD);
120 vlib_prefetch_buffer_header (p3, LOAD);
122 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
123 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
126 /* speculatively enqueue b0 and b1 to the current next frame */
127 to_next[0] = bi0 = from[0];
128 to_next[1] = bi1 = from[1];
134 b0 = vlib_get_buffer (vm, bi0);
135 b1 = vlib_get_buffer (vm, bi1);
137 /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
138 ASSERT (b0->current_data == 0);
139 ASSERT (b1->current_data == 0);
141 en0 = vlib_buffer_get_current (b0);
142 en1 = vlib_buffer_get_current (b1);
144 /* This is not the fastest way to swap src + dst mac addresses */
145 #define _(a) tmp0[a] = en0->src_address[a];
146 foreach_mac_address_offset;
148 #define _(a) en0->src_address[a] = en0->dst_address[a];
149 foreach_mac_address_offset;
151 #define _(a) en0->dst_address[a] = tmp0[a];
152 foreach_mac_address_offset;
155 #define _(a) tmp1[a] = en1->src_address[a];
156 foreach_mac_address_offset;
158 #define _(a) en1->src_address[a] = en1->dst_address[a];
159 foreach_mac_address_offset;
161 #define _(a) en1->dst_address[a] = tmp1[a];
162 foreach_mac_address_offset;
165 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
166 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
168 /* Send pkt back out the RX interface */
169 vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
170 vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;
173 /* $$$$$ End of processing 2 x packets $$$$$ */
175 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
177 if (b0->flags & VLIB_BUFFER_IS_TRACED)
179 " node-name "_trace_t *t =
180 vlib_add_trace (vm, node, b0, sizeof (*t));
181 t->sw_if_index = sw_if_index0;
182 t->next_index = next0;
184 if (b1->flags & VLIB_BUFFER_IS_TRACED)
186 " node-name "_trace_t *t =
187 vlib_add_trace (vm, node, b1, sizeof (*t));
188 t->sw_if_index = sw_if_index1;
189 t->next_index = next1;
193 /* verify speculative enqueues, maybe switch current next frame */
194 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
195 to_next, n_left_to_next,
196 bi0, bi1, next0, next1);
199 while (n_left_from > 0 && n_left_to_next > 0)
203 u32 next0 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
206 ethernet_header_t *en0;
208 /* speculatively enqueue b0 to the current next frame */
216 b0 = vlib_get_buffer (vm, bi0);
218 /* $$$$$ Single loop: process 1 packet here $$$$$ */
221 * Direct from the driver, we should be at offset 0
222 * aka at &b0->data[0]
224 ASSERT (b0->current_data == 0);
226 en0 = vlib_buffer_get_current (b0);
228 /* This is not the fastest way to swap src + dst mac addresses */
229 #define _(a) tmp0[a] = en0->src_address[a];
230 foreach_mac_address_offset;
232 #define _(a) en0->src_address[a] = en0->dst_address[a];
233 foreach_mac_address_offset;
235 #define _(a) en0->dst_address[a] = tmp0[a];
236 foreach_mac_address_offset;
239 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
241 /* Send pkt back out the RX interface */
242 vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
244 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
245 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
247 " node-name "_trace_t *t =
248 vlib_add_trace (vm, node, b0, sizeof (*t));
249 t->sw_if_index = sw_if_index0;
250 t->next_index = next0;
255 /* $$$$$ Done processing 1 packet here $$$$$ */
257 /* verify speculative enqueue, maybe switch current next frame */
258 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
259 to_next, n_left_to_next,
263 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
266 vlib_node_increment_counter (vm, " node-name "_node.index,
267 " uc-node-name "_ERROR_SWAPPED, pkts_swapped);
268 return frame->n_vectors;
271 VLIB_REGISTER_NODE (" node-name "_node) = {
272 .function = " node-name "_node_fn,
273 .name = \"" node-name "\",
274 .vector_size = sizeof (u32),
275 .format_trace = format_" node-name "_trace,
276 .type = VLIB_NODE_TYPE_INTERNAL,
278 .n_errors = ARRAY_LEN(" node-name "_error_strings),
279 .error_strings = " node-name "_error_strings,
281 .n_next_nodes = " uc-node-name "_N_NEXT,
283 /* edit / add dispositions here */
285 [" uc-node-name "_NEXT_INTERFACE_OUTPUT] = \"interface-output\",