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-rw-r--r--src/plugins/lacp/node.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/src/plugins/lacp/node.c b/src/plugins/lacp/node.c
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+++ b/src/plugins/lacp/node.c
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <vnet/bonding/node.h>
+#include <vnet/ethernet/packet.h>
+#include <lacp/node.h>
+
+lacp_state_struct lacp_state_array[] = {
+#define _(b, s, n) {.bit = b, .str = #s, },
+ foreach_lacp_state_flag
+#undef _
+ {.str = NULL}
+};
+
+static vlib_node_registration_t lacp_process_node;
+
+/** \file
+
+ 2 x LACP graph nodes: an "interior" node to process
+ incoming announcements, and a "process" node to periodically
+ send announcements.
+
+ The interior node is neither pipelined nor dual-looped, because
+ it would be very unusual to see more than one LACP packet in
+ a given input frame. So, it's a very simple / straighforward
+ example.
+*/
+
+/*
+ * packet counter strings
+ * Dump these counters via the "show error" CLI command
+ */
+static char *lacp_error_strings[] = {
+#define _(sym,string) string,
+ foreach_lacp_error
+#undef _
+};
+
+/*
+ * We actually send all lacp pkts to the "error" node after scanning
+ * them, so the graph node has only one next-index. The "error-drop"
+ * node automatically bumps our per-node packet counters for us.
+ */
+typedef enum
+{
+ LACP_INPUT_NEXT_NORMAL,
+ LACP_INPUT_N_NEXT,
+} lacp_next_t;
+
+/*
+ * Process a frame of lacp packets
+ * Expect 1 packet / frame
+ */
+static uword
+lacp_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from;
+ lacp_input_trace_t *t0;
+ uword n_trace = vlib_get_trace_count (vm, node);
+
+ from = vlib_frame_vector_args (frame); /* array of buffer indices */
+ n_left_from = frame->n_vectors; /* number of buffer indices */
+
+ while (n_left_from > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0, error0;
+
+ bi0 = from[0];
+ b0 = vlib_get_buffer (vm, bi0);
+
+ next0 = LACP_INPUT_NEXT_NORMAL;
+
+ /* scan this lacp pkt. error0 is the counter index to bump */
+ error0 = lacp_input (vm, b0, bi0);
+ b0->error = node->errors[error0];
+
+ /* If this pkt is traced, snapshoot the data */
+ if (PREDICT_FALSE (n_trace > 0))
+ {
+ int len;
+ vlib_trace_buffer (vm, node, next0, b0,
+ /* follow_chain */ 0);
+ vlib_set_trace_count (vm, node, --n_trace);
+ t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
+ len = (b0->current_length < sizeof (t0->pkt))
+ ? b0->current_length : sizeof (t0->pkt);
+ t0->len = len;
+ clib_memcpy (&t0->pkt, vlib_buffer_get_current (b0), len);
+ }
+ /* push this pkt to the next graph node, always error-drop */
+ vlib_set_next_frame_buffer (vm, node, next0, bi0);
+
+ from += 1;
+ n_left_from -= 1;
+ }
+
+ return frame->n_vectors;
+}
+
+/*
+ * lacp input graph node declaration
+ */
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (lacp_input_node, static) = {
+ .function = lacp_node_fn,
+ .name = "lacp-input",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = LACP_N_ERROR,
+ .error_strings = lacp_error_strings,
+
+ .format_trace = lacp_input_format_trace,
+
+ .n_next_nodes = LACP_INPUT_N_NEXT,
+ .next_nodes = {
+ [LACP_INPUT_NEXT_NORMAL] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+/*
+ * lacp periodic function
+ */
+static uword
+lacp_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
+{
+ lacp_main_t *lm = &lacp_main;
+ f64 poll_time_remaining;
+ uword event_type, *event_data = 0;
+ u8 enabled = 0;
+
+ /* So we can send events to the lacp process */
+ lm->lacp_process_node_index = lacp_process_node.index;
+
+ ethernet_register_input_type (vm, ETHERNET_TYPE_SLOW_PROTOCOLS /* LACP */ ,
+ lacp_input_node.index);
+
+ poll_time_remaining = 0.2;
+ while (1)
+ {
+ if (enabled)
+ poll_time_remaining =
+ vlib_process_wait_for_event_or_clock (vm, poll_time_remaining);
+ else
+ vlib_process_wait_for_event (vm);
+
+ event_type = vlib_process_get_events (vm, &event_data);
+ switch (event_type)
+ {
+ case ~0: /* no events => timeout */
+ break;
+ case LACP_PROCESS_EVENT_START:
+ enabled = 1;
+ break;
+ case LACP_PROCESS_EVENT_STOP:
+ enabled = 0;
+ continue;
+ default:
+ clib_warning ("BUG: event type 0x%wx", event_type);
+ break;
+ }
+ if (event_data)
+ _vec_len (event_data) = 0;
+
+ if (vlib_process_suspend_time_is_zero (poll_time_remaining))
+ {
+ lacp_periodic (vm);
+ poll_time_remaining = 0.2;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * lacp periodic node declaration
+ */
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (lacp_process_node, static) = {
+ .function = lacp_process,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "lacp-process",
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */