Line data Source code
1 : /*
2 : * Copyright (c) 2017 Cisco and/or its affiliates.
3 : * Licensed under the Apache License, Version 2.0 (the "License");
4 : * you may not use this file except in compliance with the License.
5 : * You may obtain a copy of the License at:
6 : *
7 : * http://www.apache.org/licenses/LICENSE-2.0
8 : *
9 : * Unless required by applicable law or agreed to in writing, software
10 : * distributed under the License is distributed on an "AS IS" BASIS,
11 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 : * See the License for the specific language governing permissions and
13 : * limitations under the License.
14 : */
15 :
16 : #define _GNU_SOURCE
17 : #include <vnet/bonding/node.h>
18 : #include <vnet/ethernet/packet.h>
19 : #include <lacp/node.h>
20 :
21 : lacp_state_struct lacp_state_array[] = {
22 : #define _(b, s, n) {.bit = b, .str = #s, },
23 : foreach_lacp_state_flag
24 : #undef _
25 : {.str = NULL}
26 : };
27 :
28 : /** \file
29 :
30 : 2 x LACP graph nodes: an "interior" node to process
31 : incoming announcements, and a "process" node to periodically
32 : send announcements.
33 :
34 : The interior node is neither pipelined nor dual-looped, because
35 : it would be very unusual to see more than one LACP packet in
36 : a given input frame. So, it's a very simple / straightforward
37 : example.
38 : */
39 :
40 : /*
41 : * packet counter strings
42 : * Dump these counters via the "show error" CLI command
43 : */
44 : static char *lacp_error_strings[] = {
45 : #define _(sym,string) string,
46 : foreach_lacp_error
47 : #undef _
48 : };
49 :
50 : /*
51 : * We actually send all lacp pkts to the "error" node after scanning
52 : * them, so the graph node has only one next-index. The "error-drop"
53 : * node automatically bumps our per-node packet counters for us.
54 : */
55 : typedef enum
56 : {
57 : LACP_INPUT_NEXT_NORMAL,
58 : LACP_INPUT_N_NEXT,
59 : } lacp_next_t;
60 :
61 : /*
62 : * Process a frame of lacp packets
63 : * Expect 1 packet / frame
64 : */
65 : static uword
66 17 : lacp_node_fn (vlib_main_t * vm,
67 : vlib_node_runtime_t * node, vlib_frame_t * frame)
68 : {
69 : u32 n_left_from, *from;
70 : lacp_input_trace_t *t0;
71 :
72 17 : from = vlib_frame_vector_args (frame); /* array of buffer indices */
73 17 : n_left_from = frame->n_vectors; /* number of buffer indices */
74 :
75 41 : while (n_left_from > 0)
76 : {
77 : u32 bi0;
78 : vlib_buffer_t *b0;
79 : u32 next0, error0;
80 :
81 24 : bi0 = from[0];
82 24 : b0 = vlib_get_buffer (vm, bi0);
83 :
84 24 : next0 = LACP_INPUT_NEXT_NORMAL;
85 :
86 : /* scan this lacp pkt. error0 is the counter index to bump */
87 24 : error0 = lacp_input (vm, b0, bi0);
88 24 : b0->error = node->errors[error0];
89 :
90 : /* If this pkt is traced, snapshoot the data */
91 24 : if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
92 : {
93 : int len;
94 :
95 1 : t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
96 1 : len = (b0->current_length < sizeof (t0->pkt))
97 1 : ? b0->current_length : sizeof (t0->pkt);
98 1 : t0->len = len;
99 1 : t0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
100 1 : clib_memcpy_fast (&t0->pkt, vlib_buffer_get_current (b0), len);
101 : }
102 : /* push this pkt to the next graph node, always error-drop */
103 24 : vlib_set_next_frame_buffer (vm, node, next0, bi0);
104 :
105 24 : from += 1;
106 24 : n_left_from -= 1;
107 : }
108 :
109 17 : return frame->n_vectors;
110 : }
111 :
112 : /*
113 : * lacp input graph node declaration
114 : */
115 : /* *INDENT-OFF* */
116 111212 : VLIB_REGISTER_NODE (lacp_input_node, static) = {
117 : .function = lacp_node_fn,
118 : .name = "lacp-input",
119 : .vector_size = sizeof (u32),
120 : .type = VLIB_NODE_TYPE_INTERNAL,
121 :
122 : .n_errors = LACP_N_ERROR,
123 : .error_strings = lacp_error_strings,
124 :
125 : .format_trace = lacp_input_format_trace,
126 :
127 : .n_next_nodes = LACP_INPUT_N_NEXT,
128 : .next_nodes = {
129 : [LACP_INPUT_NEXT_NORMAL] = "error-drop",
130 : },
131 : };
132 : /* *INDENT-ON* */
133 :
134 : static void
135 4 : lacp_elog_start_event (void)
136 : {
137 4 : lacp_main_t *lm = &lacp_main;
138 : /* *INDENT-OFF* */
139 : ELOG_TYPE_DECLARE (e) =
140 : {
141 : .format = "Starting LACP process, interface count = %d",
142 : .format_args = "i4",
143 : };
144 : /* *INDENT-ON* */
145 : struct
146 : {
147 : u32 count;
148 : } *ed;
149 :
150 4 : ed = ELOG_DATA (&vlib_global_main.elog_main, e);
151 4 : ed->count = lm->lacp_int;
152 4 : }
153 :
154 : static void
155 4 : lacp_elog_stop_event (void)
156 : {
157 4 : lacp_main_t *lm = &lacp_main;
158 : /* *INDENT-OFF* */
159 : ELOG_TYPE_DECLARE (e) =
160 : {
161 : .format = "Stopping LACP process, interface count = %d",
162 : .format_args = "i4",
163 : };
164 : /* *INDENT-ON* */
165 : struct
166 : {
167 : u32 count;
168 : } *ed;
169 :
170 4 : ed = ELOG_DATA (&vlib_global_main.elog_main, e);
171 4 : ed->count = lm->lacp_int;
172 4 : }
173 :
174 : /*
175 : * lacp periodic function
176 : */
177 : static uword
178 3 : lacp_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
179 : {
180 3 : lacp_main_t *lm = &lacp_main;
181 : f64 poll_time_remaining;
182 3 : uword event_type, *event_data = 0;
183 :
184 3 : ethernet_register_input_type (vm, ETHERNET_TYPE_SLOW_PROTOCOLS /* LACP */ ,
185 : lacp_input_node.index);
186 :
187 3 : poll_time_remaining = 0.2;
188 : while (1)
189 : {
190 38 : if (lm->lacp_int > 0)
191 : poll_time_remaining =
192 31 : vlib_process_wait_for_event_or_clock (vm, poll_time_remaining);
193 : else
194 7 : vlib_process_wait_for_event (vm);
195 :
196 35 : event_type = vlib_process_get_events (vm, &event_data);
197 35 : switch (event_type)
198 : {
199 27 : case ~0: /* no events => timeout */
200 27 : break;
201 4 : case LACP_PROCESS_EVENT_START:
202 4 : poll_time_remaining = 0.2;
203 4 : lacp_elog_start_event ();
204 4 : break;
205 4 : case LACP_PROCESS_EVENT_STOP:
206 4 : if (lm->lacp_int == 0)
207 : {
208 4 : poll_time_remaining = SECS_IN_A_DAY;
209 4 : lacp_elog_stop_event ();
210 : }
211 4 : break;
212 0 : default:
213 0 : clib_warning ("BUG: event type 0x%wx", event_type);
214 0 : break;
215 : }
216 35 : vec_reset_length (event_data);
217 :
218 35 : if (vlib_process_suspend_time_is_zero (poll_time_remaining))
219 : {
220 15 : lacp_periodic (vm);
221 15 : poll_time_remaining = 0.2;
222 : }
223 : }
224 :
225 : return 0;
226 : }
227 :
228 : void
229 11 : lacp_create_periodic_process (void)
230 : {
231 11 : lacp_main_t *lm = &lacp_main;
232 :
233 : /* Already created the process node? */
234 11 : if (lm->lacp_process_node_index > 0)
235 8 : return;
236 :
237 : /* No, create it now and make a note of the node index */
238 3 : lm->lacp_process_node_index =
239 3 : vlib_process_create (lm->vlib_main, "lacp-process", lacp_process,
240 : 16 /* log2_n_stack_bytes */ );
241 : }
242 :
243 : /*
244 : * fd.io coding-style-patch-verification: ON
245 : *
246 : * Local Variables:
247 : * eval: (c-set-style "gnu")
248 : * End:
249 : */
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