1 ;;; Copyright (c) 2016 Cisco and/or its affiliates.
2 ;;; Licensed under the Apache License, Version 2.0 (the "License");
3 ;;; you may not use this file except in compliance with the License.
4 ;;; You may obtain a copy of the License at:
6 ;;; http://www.apache.org/licenses/LICENSE-2.0
8 ;;; Unless required by applicable law or agreed to in writing, software
9 ;;; distributed under the License is distributed on an "AS IS" BASIS,
10 ;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 ;;; See the License for the specific language governing permissions and
12 ;;; limitations under the License.
14 ;;; dual-loop-skel.el - Eliotic dual-loop node skeleton
18 (define-skeleton skel-dual-loop
19 "Insert a skeleton dual-loop graph node"
21 '(setq node-name (skeleton-read "Node Name: "))
22 '(setq uc-node-name (upcase node-name))
23 '(setq main-p (concat (substring plugin-name 0 1) "mp"))
25 #include <vlib/vlib.h>
26 #include <vnet/vnet.h>
27 #include <vnet/pg/pg.h>
29 #include <vnet/ip/ip.h>
30 #include <vnet/ethernet/ethernet.h>
32 #include <vppinfra/hash.h>
33 #include <vppinfra/error.h>
34 #include <vppinfra/elog.h>
38 vlib_main_t * vlib_main;
39 vnet_main_t * vnet_main;
40 ethernet_main_t * ethernet_main;
41 } " node-name "_main_t;
43 " node-name "_main_t " node-name "_main;
45 vlib_node_registration_t " node-name "_node;
50 } " node-name "_trace_t;
52 /* packet trace format function */
53 static u8 * format_" node-name "_trace (u8 * s, va_list * args)
55 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
56 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
57 " node-name "_trace_t * t = va_arg (*args, " node-name "_trace_t *);
59 s = format (s, \"" uc-node-name ": sw_if_index %d, next index %d\",
60 t->sw_if_index, t->next_index);
64 vlib_node_registration_t " node-name "_node;
66 #define foreach_" node-name "_error \\
67 _(SWAPPED, \"Mac swap packets processed\")
70 #define _(sym,str) " uc-node-name "_ERROR_##sym,
71 foreach_" node-name "_error
73 " uc-node-name "_N_ERROR,
74 } " node-name "_error_t;
76 static char * " node-name "_error_strings[] = {
77 #define _(sym,string) string,
78 foreach_" node-name "_error
83 " uc-node-name "_NEXT_INTERFACE_OUTPUT,
84 " uc-node-name "_N_NEXT,
85 } " node-name "_next_t;
87 #define foreach_mac_address_offset \\
96 " node-name "_node_fn (vlib_main_t * vm,
97 vlib_node_runtime_t * node,
100 u32 n_left_from, * from, * to_next;
101 " node-name "_next_t next_index;
102 u32 pkts_swapped = 0;
104 from = vlib_frame_vector_args (frame);
105 n_left_from = frame->n_vectors;
106 next_index = node->cached_next_index;
108 while (n_left_from > 0)
112 vlib_get_next_frame (vm, node, next_index,
113 to_next, n_left_to_next);
115 while (n_left_from >= 4 && n_left_to_next >= 2)
117 u32 next0 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
118 u32 next1 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
119 u32 sw_if_index0, sw_if_index1;
121 ethernet_header_t *en0, *en1;
123 vlib_buffer_t * b0, * b1;
125 /* Prefetch next iteration. */
127 vlib_buffer_t * p2, * p3;
129 p2 = vlib_get_buffer (vm, from[2]);
130 p3 = vlib_get_buffer (vm, from[3]);
132 vlib_prefetch_buffer_header (p2, LOAD);
133 vlib_prefetch_buffer_header (p3, LOAD);
135 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
136 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
139 /* speculatively enqueue b0 and b1 to the current next frame */
140 to_next[0] = bi0 = from[0];
141 to_next[1] = bi1 = from[1];
147 b0 = vlib_get_buffer (vm, bi0);
148 b1 = vlib_get_buffer (vm, bi1);
150 /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
151 ASSERT (b0->current_data == 0);
152 ASSERT (b1->current_data == 0);
154 en0 = vlib_buffer_get_current (b0);
155 en1 = vlib_buffer_get_current (b1);
157 /* This is not the fastest way to swap src + dst mac addresses */
158 #define _(a) tmp0[a] = en0->src_address[a];
159 foreach_mac_address_offset;
161 #define _(a) en0->src_address[a] = en0->dst_address[a];
162 foreach_mac_address_offset;
164 #define _(a) en0->dst_address[a] = tmp0[a];
165 foreach_mac_address_offset;
168 #define _(a) tmp1[a] = en1->src_address[a];
169 foreach_mac_address_offset;
171 #define _(a) en1->src_address[a] = en1->dst_address[a];
172 foreach_mac_address_offset;
174 #define _(a) en1->dst_address[a] = tmp1[a];
175 foreach_mac_address_offset;
178 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
179 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
181 /* Send pkt back out the RX interface */
182 vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
183 vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;
186 /* $$$$$ End of processing 2 x packets $$$$$ */
188 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
190 if (b0->flags & VLIB_BUFFER_IS_TRACED)
192 " node-name "_trace_t *t =
193 vlib_add_trace (vm, node, b0, sizeof (*t));
194 t->sw_if_index = sw_if_index0;
195 t->next_index = next0;
197 if (b1->flags & VLIB_BUFFER_IS_TRACED)
199 " node-name "_trace_t *t =
200 vlib_add_trace (vm, node, b1, sizeof (*t));
201 t->sw_if_index = sw_if_index1;
202 t->next_index = next1;
206 /* verify speculative enqueues, maybe switch current next frame */
207 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
208 to_next, n_left_to_next,
209 bi0, bi1, next0, next1);
212 while (n_left_from > 0 && n_left_to_next > 0)
216 u32 next0 = " uc-node-name "_NEXT_INTERFACE_OUTPUT;
219 ethernet_header_t *en0;
221 /* speculatively enqueue b0 to the current next frame */
229 b0 = vlib_get_buffer (vm, bi0);
231 /* $$$$$ Single loop: process 1 packet here $$$$$ */
234 * Direct from the driver, we should be at offset 0
235 * aka at &b0->data[0]
237 ASSERT (b0->current_data == 0);
239 en0 = vlib_buffer_get_current (b0);
241 /* This is not the fastest way to swap src + dst mac addresses */
242 #define _(a) tmp0[a] = en0->src_address[a];
243 foreach_mac_address_offset;
245 #define _(a) en0->src_address[a] = en0->dst_address[a];
246 foreach_mac_address_offset;
248 #define _(a) en0->dst_address[a] = tmp0[a];
249 foreach_mac_address_offset;
252 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
254 /* Send pkt back out the RX interface */
255 vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
257 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
258 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
260 " node-name "_trace_t *t =
261 vlib_add_trace (vm, node, b0, sizeof (*t));
262 t->sw_if_index = sw_if_index0;
263 t->next_index = next0;
268 /* $$$$$ Done processing 1 packet here $$$$$ */
270 /* verify speculative enqueue, maybe switch current next frame */
271 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
272 to_next, n_left_to_next,
276 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
279 vlib_node_increment_counter (vm, " node-name "_node.index,
280 " uc-node-name "_ERROR_SWAPPED, pkts_swapped);
281 return frame->n_vectors;
284 VLIB_REGISTER_NODE (" node-name "_node) = {
285 .function = " node-name "_node_fn,
286 .name = \"" node-name "\",
287 .vector_size = sizeof (u32),
288 .format_trace = format_" node-name "_trace,
289 .type = VLIB_NODE_TYPE_INTERNAL,
291 .n_errors = ARRAY_LEN(" node-name "_error_strings),
292 .error_strings = " node-name "_error_strings,
294 .n_next_nodes = " uc-node-name "_N_NEXT,
296 /* edit / add dispositions here */
298 [" uc-node-name "_NEXT_INTERFACE_OUTPUT] = \"interface-output\",
302 clib_error_t *" node-name "_init (vlib_main_t *vm)
304 " node-name "_main_t *" main-p " = &" node-name "_main;
306 /* $$$$$ Initialize " node-name "_main_t structure here. $$$$$ */
307 " main-p "->vlib_main = vm;
308 " main-p "->vnet_main = vnet_get_main();
309 " main-p "->ethernet_main = ethernet_get_main(vm);
314 VLIB_INIT_FUNCTION(" node-name "_init);