1 ;;; dual-loop-skel.el - Eliotic dual-loop node skeleton
5 (define-skeleton skel-dual-loop
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>
15 #include <vnet/ip/ip.h>
16 #include <vnet/ethernet/ethernet.h>
18 #include <vppinfra/hash.h>
19 #include <vppinfra/error.h>
20 #include <vppinfra/elog.h>
24 vlib_main_t * vlib_main;
25 vnet_main_t * vnet_main;
26 ethernet_main_t * ethernet_main;
27 } " node-name "_main_t;
29 " node-name "_main_t " node-name "_main;
31 vlib_node_registration_t " node-name "_node;
36 } " node-name "_trace_t;
38 /* packet trace format function */
39 static u8 * format_" node-name "_trace (u8 * s, va_list * args)
41 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
42 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
43 " node-name "_trace_t * t = va_arg (*args, " node-name "_trace_t *);
45 s = format (s, \"" uc-node-name ": sw_if_index %d, next index %d\",
46 t->sw_if_index, t->next_index);
50 vlib_node_registration_t " node-name "_node;
52 #define foreach_" node-name "_error \\
53 _(SWAPPED, \"Mac swap packets processed\")
56 #define _(sym,str) " uc-node-name "_ERROR_##sym,
57 foreach_" node-name "_error
59 " uc-node-name "_N_ERROR,
60 } " node-name "_error_t;
62 static char * " node-name "_error_strings[] = {
63 #define _(sym,string) string,
64 foreach_" node-name "_error
69 " uc-node-name "_NEXT_INTERFACE_OUTPUT,
70 " uc-node-name "_N_NEXT,
71 } " node-name "_next_t;
73 #define foreach_mac_address_offset \\
82 " node-name "_node_fn (vlib_main_t * vm,
83 vlib_node_runtime_t * node,
86 u32 n_left_from, * from, * to_next;
87 " node-name "_next_t next_index;
90 from = vlib_frame_vector_args (frame);
91 n_left_from = frame->n_vectors;
92 next_index = node->cached_next_index;
94 while (n_left_from > 0)
98 vlib_get_next_frame (vm, node, next_index,
99 to_next, n_left_to_next);
101 while (n_left_from >= 4 && n_left_to_next >= 2)
103 u32 next0 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
104 u32 next1 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
105 u32 sw_if_index0, sw_if_index1;
107 ethernet_header_t *en0, *en1;
109 vlib_buffer_t * b0, * b1;
111 /* Prefetch next iteration. */
113 vlib_buffer_t * p2, * p3;
115 p2 = vlib_get_buffer (vm, from[2]);
116 p3 = vlib_get_buffer (vm, from[3]);
118 vlib_prefetch_buffer_header (p2, LOAD);
119 vlib_prefetch_buffer_header (p3, LOAD);
121 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
122 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
125 /* speculatively enqueue b0 and b1 to the current next frame */
126 to_next[0] = bi0 = from[0];
127 to_next[1] = bi1 = from[1];
133 b0 = vlib_get_buffer (vm, bi0);
134 b1 = vlib_get_buffer (vm, bi1);
136 /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
137 ASSERT (b0->current_data == 0);
138 ASSERT (b1->current_data == 0);
140 en0 = vlib_buffer_get_current (b0);
141 en1 = vlib_buffer_get_current (b1);
143 /* This is not the fastest way to swap src + dst mac addresses */
144 #define _(a) tmp0[a] = en0->src_address[a];
145 foreach_mac_address_offset;
147 #define _(a) en0->src_address[a] = en0->dst_address[a];
148 foreach_mac_address_offset;
150 #define _(a) en0->dst_address[a] = tmp0[a];
151 foreach_mac_address_offset;
154 #define _(a) tmp1[a] = en1->src_address[a];
155 foreach_mac_address_offset;
157 #define _(a) en1->src_address[a] = en1->dst_address[a];
158 foreach_mac_address_offset;
160 #define _(a) en1->dst_address[a] = tmp1[a];
161 foreach_mac_address_offset;
164 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
165 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
167 /* Send pkt back out the RX interface */
168 vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
169 vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;
172 /* $$$$$ End of processing 2 x packets $$$$$ */
174 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
176 if (b0->flags & VLIB_BUFFER_IS_TRACED)
178 " node-name "_trace_t *t =
179 vlib_add_trace (vm, node, b0, sizeof (*t));
180 t->sw_if_index = sw_if_index0;
181 t->next_index = next0;
183 if (b1->flags & VLIB_BUFFER_IS_TRACED)
185 " node-name "_trace_t *t =
186 vlib_add_trace (vm, node, b1, sizeof (*t));
187 t->sw_if_index = sw_if_index1;
188 t->next_index = next1;
192 /* verify speculative enqueues, maybe switch current next frame */
193 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
194 to_next, n_left_to_next,
195 bi0, bi1, next0, next1);
198 while (n_left_from > 0 && n_left_to_next > 0)
202 u32 next0 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
205 ethernet_header_t *en0;
207 /* speculatively enqueue b0 to the current next frame */
215 b0 = vlib_get_buffer (vm, bi0);
217 /* $$$$$ Single loop: process 1 packet here $$$$$ */
220 * Direct from the driver, we should be at offset 0
221 * aka at &b0->data[0]
223 ASSERT (b0->current_data == 0);
225 en0 = vlib_buffer_get_current (b0);
227 /* This is not the fastest way to swap src + dst mac addresses */
228 #define _(a) tmp0[a] = en0->src_address[a];
229 foreach_mac_address_offset;
231 #define _(a) en0->src_address[a] = en0->dst_address[a];
232 foreach_mac_address_offset;
234 #define _(a) en0->dst_address[a] = tmp0[a];
235 foreach_mac_address_offset;
238 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
240 /* Send pkt back out the RX interface */
241 vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
243 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
244 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
246 " node-name "_trace_t *t =
247 vlib_add_trace (vm, node, b0, sizeof (*t));
248 t->sw_if_index = sw_if_index0;
249 t->next_index = next0;
254 /* $$$$$ Done processing 1 packet here $$$$$ */
256 /* verify speculative enqueue, maybe switch current next frame */
257 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
258 to_next, n_left_to_next,
262 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
265 vlib_node_increment_counter (vm, " node-name "_node.index,
266 " uc-node-name "_ERROR_SWAPPED, pkts_swapped);
267 return frame->n_vectors;
270 VLIB_REGISTER_NODE (" node-name "_node) = {
271 .function = " node-name "_node_fn,
272 .name = \"" node-name "\",
273 .vector_size = sizeof (u32),
274 .format_trace = format_" node-name "_trace,
275 .type = VLIB_NODE_TYPE_INTERNAL,
277 .n_errors = ARRAY_LEN(" node-name "_error_strings),
278 .error_strings = " node-name "_error_strings,
280 .n_next_nodes = " uc-node-name "_N_NEXT,
282 /* edit / add dispositions here */
284 [" uc-node-name "_NEXT_INTERFACE_OUTPUT] = \"interface-output\",
288 clib_error_t *" node-name "_init (vlib_main_t *vm)
290 " node-name "_main_t *msm = &" node-name "_main;
292 /* $$$$$ Initialize " node-name "_main_t structure here. $$$$$ */
294 msm->vnet_main = vnet_get_main();
295 msm->ethernet_main = ethernet_get_main(vm);
300 VLIB_INIT_FUNCTION(" node-name "_init);