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-rw-r--r--src/vlib/punt.c629
1 files changed, 629 insertions, 0 deletions
diff --git a/src/vlib/punt.c b/src/vlib/punt.c
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+++ b/src/vlib/punt.c
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+/*
+ * Copyright (c) 2018 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.
+ */
+
+#include <vlib/punt.h>
+
+/**
+ * The last allocated punt reason
+ */
+static vlib_punt_reason_t punt_reason_last;
+
+/**
+ * Counters per punt-reason
+ */
+vlib_combined_counter_main_t punt_counters = {
+ .name = "punt",
+ .stat_segment_name = "/net/punt",
+};
+
+/**
+ * A punt reason
+ */
+typedef struct punt_reason_data_t_
+{
+ /**
+ * The reason name
+ */
+ u8 *pd_name;
+
+ /**
+ * The allocated reason value
+ */
+ vlib_punt_reason_t pd_reason;
+
+ /**
+ * Clients/owners that have registered this reason
+ */
+ u32 *pd_owners;
+} punt_reason_data_t;
+
+/**
+ * data for each punt reason
+ */
+static punt_reason_data_t *punt_reason_data;
+
+typedef enum punt_format_flags_t_
+{
+ PUNT_FORMAT_FLAG_NONE = 0,
+ PUNT_FORMAT_FLAG_DETAIL = (1 << 0),
+} punt_format_flags_t;
+
+/**
+ * A registration, by a client, to direct punted traffic to a given node
+ */
+typedef struct punt_reg_t_
+{
+ /**
+ * Reason the packets were punted
+ */
+ vlib_punt_reason_t pr_reason;
+
+ /**
+ * number of clients that have made this registration
+ */
+ u16 pr_locks;
+
+ /**
+ * The edge from the punt dispatch node to the requested node
+ */
+ u16 pr_edge;
+
+ /**
+ * node-index to send punted packets to
+ */
+ u32 pr_node_index;
+} punt_reg_t;
+
+/**
+ * Pool of registrations
+ */
+static punt_reg_t *punt_reg_pool;
+
+/**
+ * A DB of all the register nodes against punt reason and node index
+ */
+static uword *punt_reg_db;
+
+/**
+ * A DB used in the DP per-reason to dispatch packets to the requested nodes.
+ * this is a vector of edges per-reason
+ */
+u16 **punt_dp_db;
+
+/**
+ * A client using the punt serivce and its registrations
+ */
+typedef struct punt_client_t_
+{
+ /**
+ * The name of the client
+ */
+ u8 *pc_name;
+
+ /**
+ * The registrations is has made
+ */
+ u32 *pc_regs;
+} punt_client_t;
+
+/**
+ * Pool of clients
+ */
+static punt_client_t *punt_client_pool;
+
+/**
+ * DB of clients key'd by their name
+ */
+static uword *punt_client_db;
+
+u8 *
+format_vlib_punt_reason (u8 * s, va_list * args)
+{
+ vlib_punt_reason_t pr = va_arg (*args, int);
+
+ return (format (s, "[%d] %v", pr, punt_reason_data[pr].pd_name));
+}
+
+vlib_punt_hdl_t
+vlib_punt_client_register (const char *who)
+{
+ u8 *pc_name;
+ uword *p;
+ u32 pci;
+
+ pc_name = format (NULL, "%s", who);
+ p = hash_get_mem (punt_client_db, pc_name);
+
+ if (NULL == p)
+ {
+ punt_client_t *pc;
+
+ pool_get (punt_client_pool, pc);
+ pci = pc - punt_client_pool;
+
+ pc->pc_name = pc_name;
+
+ hash_set_mem (punt_client_db, pc->pc_name, pci);
+ }
+ else
+ {
+ pci = p[0];
+ vec_free (pc_name);
+ }
+
+ return (pci);
+}
+
+static int
+punt_validate_client (vlib_punt_hdl_t client)
+{
+ return (!pool_is_free_index (punt_client_pool, client));
+}
+
+static u64
+punt_reg_mk_key (vlib_punt_reason_t reason, u32 node_index)
+{
+ return (((u64) node_index) << 32 | reason);
+}
+
+static u32
+punt_reg_find (vlib_punt_reason_t reason, u32 node_index)
+{
+ uword *p;
+
+ p = hash_get (punt_reg_db, punt_reg_mk_key (reason, node_index));
+
+ if (p)
+ return p[0];
+
+ return ~0;
+}
+
+static void
+punt_reg_add (const punt_reg_t * pr)
+{
+ hash_set (punt_reg_db, punt_reg_mk_key (pr->pr_reason,
+ pr->pr_node_index),
+ pr - punt_reg_pool);
+}
+
+static void
+punt_reg_remove (const punt_reg_t * pr)
+{
+ hash_unset (punt_reg_db, punt_reg_mk_key (pr->pr_reason,
+ pr->pr_node_index));
+}
+
+/**
+ * reconstruct the DP per-reason DB
+ */
+static void
+punt_reg_mk_dp (vlib_punt_reason_t reason)
+{
+ u32 pri, *prip, *pris;
+ const punt_reg_t *pr;
+ u16 *edges, *old;
+ u64 key;
+
+ pris = NULL;
+ edges = NULL;
+ vec_validate (punt_dp_db, reason);
+
+ old = punt_dp_db[reason];
+
+ /* *INDENT-OFF* */
+ hash_foreach (key, pri, punt_reg_db,
+ ({
+ vec_add1(pris, pri);
+ }));
+ /* *INDENT-ON* */
+
+ /*
+ * A check for an empty vector is done in the DP, so the a zero
+ * length vector here is ok
+ */
+ vec_foreach (prip, pris)
+ {
+ pr = pool_elt_at_index (punt_reg_pool, *prip);
+
+ if (pr->pr_reason == reason)
+ vec_add1 (edges, pr->pr_edge);
+ }
+
+ /* atomic update of the DP */
+ punt_dp_db[reason] = edges;
+
+ vec_free (old);
+}
+
+int
+vlib_punt_register (vlib_punt_hdl_t client, vlib_punt_reason_t reason,
+ const char *node_name)
+{
+ vlib_node_t *punt_to, *punt_from;
+ punt_client_t *pc;
+ vlib_main_t *vm;
+ punt_reg_t *pr;
+ u32 pri;
+
+ if (reason >= punt_reason_last)
+ return -1;
+ if (!punt_validate_client (client))
+ return -2;
+
+ vm = vlib_get_main ();
+ pc = pool_elt_at_index (punt_client_pool, client);
+ punt_to = vlib_get_node_by_name (vm, (u8 *) node_name);
+ punt_from = vlib_get_node_by_name (vm, (u8 *) "punt-dispatch");
+
+ /*
+ * find a global matching registration
+ */
+ pri = punt_reg_find (reason, punt_to->index);
+
+ if (~0 != pri)
+ {
+ u32 pos;
+
+ pos = vec_search (pc->pc_regs, pri);
+
+ if (~0 != pos)
+ {
+ /* duplicate registration for this client */
+ return -1;
+ }
+
+ pr = pool_elt_at_index (punt_reg_pool, pri);
+ }
+ else
+ {
+ pool_get (punt_reg_pool, pr);
+
+ pr->pr_reason = reason;
+ pr->pr_node_index = punt_to->index;
+ pr->pr_edge = vlib_node_add_next (vm,
+ punt_from->index, pr->pr_node_index);
+
+ pri = pr - punt_reg_pool;
+
+ punt_reg_add (pr);
+ }
+
+ /*
+ * add this reg to the list the client has made
+ */
+ pr->pr_locks++;
+ vec_add1 (pc->pc_regs, pri);
+
+ punt_reg_mk_dp (reason);
+
+ return 0;
+}
+
+int
+vlib_punt_unregister (vlib_punt_hdl_t client,
+ vlib_punt_reason_t reason, const char *node_name)
+{
+ vlib_node_t *punt_to;
+ punt_client_t *pc;
+ vlib_main_t *vm;
+ punt_reg_t *pr;
+ u32 pri;
+
+ if (reason >= punt_reason_last)
+ return -1;
+
+ vm = vlib_get_main ();
+ pc = pool_elt_at_index (punt_client_pool, client);
+ punt_to = vlib_get_node_by_name (vm, (u8 *) node_name);
+
+ /*
+ * construct a registration and check if it's one this client already has
+ */
+ pri = punt_reg_find (reason, punt_to->index);
+
+ if (~0 != pri)
+ {
+ u32 pos;
+
+ pos = vec_search (pc->pc_regs, pri);
+
+ if (~0 == pos)
+ {
+ /* not a registration for this client */
+ return -1;
+ }
+ vec_del1 (pc->pc_regs, pos);
+
+ pr = pool_elt_at_index (punt_reg_pool, pri);
+
+ pr->pr_locks--;
+
+ if (0 == pr->pr_locks)
+ {
+ punt_reg_remove (pr);
+ pool_put (punt_reg_pool, pr);
+ }
+ }
+
+ /*
+ * rebuild the DP data-base
+ */
+ punt_reg_mk_dp (reason);
+
+ return (0);
+}
+
+int
+vlib_punt_reason_alloc (vlib_punt_hdl_t client,
+ const char *reason_name, vlib_punt_reason_t * reason)
+{
+ vlib_punt_reason_t new;
+
+ if (!punt_validate_client (client))
+ return -2;
+
+ new = punt_reason_last++;
+ vec_validate (punt_reason_data, new);
+ punt_reason_data[new].pd_name = format (NULL, "%s", reason_name);
+ punt_reason_data[new].pd_reason = new;
+ vec_add1 (punt_reason_data[new].pd_owners, client);
+
+ vlib_validate_combined_counter (&punt_counters, new);
+ vlib_zero_combined_counter (&punt_counters, new);
+
+ *reason = new;
+
+ /* build the DP data-base */
+ punt_reg_mk_dp (*reason);
+
+ return (0);
+}
+
+/* Parse node name -> node index. */
+uword
+unformat_punt_client (unformat_input_t * input, va_list * args)
+{
+ u32 *result = va_arg (*args, u32 *);
+
+ return unformat_user (input, unformat_hash_vec_string,
+ punt_client_db, result);
+}
+
+u8 *
+format_punt_reg (u8 * s, va_list * args)
+{
+ u32 pri = va_arg (*args, u32);
+ punt_reg_t *pr;
+
+ pr = pool_elt_at_index (punt_reg_pool, pri);
+
+ s = format (s, "%U -> %U",
+ format_vlib_punt_reason, pr->pr_reason,
+ format_vlib_node_name, vlib_get_main (), pr->pr_node_index);
+
+ return (s);
+}
+
+u8 *
+format_punt_reason_data (u8 * s, va_list * args)
+{
+ punt_reason_data_t *pd = va_arg (*args, punt_reason_data_t *);
+ punt_client_t *pc;
+ u32 *pci;
+
+ s = format (s, "[%d] %v from:[", pd->pd_reason, pd->pd_name);
+ vec_foreach (pci, pd->pd_owners)
+ {
+ pc = pool_elt_at_index (punt_client_pool, *pci);
+ s = format (s, "%v ", pc->pc_name);
+ }
+ s = format (s, "]");
+
+ return (s);
+}
+
+u8 *
+format_punt_client (u8 * s, va_list * args)
+{
+ u32 pci = va_arg (*args, u32);
+ punt_format_flags_t flags = va_arg (*args, punt_format_flags_t);
+ punt_client_t *pc;
+
+ pc = pool_elt_at_index (punt_client_pool, pci);
+
+ s = format (s, "%v", pc->pc_name);
+
+ if (flags & PUNT_FORMAT_FLAG_DETAIL)
+ {
+ punt_reason_data_t *pd;
+ u32 *pri;
+
+ s = format (s, "\n registrations:");
+ vec_foreach (pri, pc->pc_regs)
+ {
+ s = format (s, "\n [%U]", format_punt_reg, *pri);
+ }
+
+ s = format (s, "\n reasons:");
+
+ vec_foreach (pd, punt_reason_data)
+ {
+ u32 *tmp;
+
+ vec_foreach (tmp, pd->pd_owners)
+ {
+ if (*tmp == pci)
+ s = format (s, "\n %U", format_punt_reason_data, pd);
+ }
+ }
+ }
+ return (s);
+}
+
+static clib_error_t *
+punt_client_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ u32 pci = ~0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "%U", unformat_punt_client, &pci))
+ ;
+ else
+ break;
+ }
+
+ if (~0 != pci)
+ {
+ vlib_cli_output (vm, "%U", format_punt_client, pci,
+ PUNT_FORMAT_FLAG_DETAIL);
+ }
+ else
+ {
+ u8 *name;
+
+ /* *INDENT-OFF* */
+ hash_foreach(name, pci, punt_client_db,
+ ({
+ vlib_cli_output (vm, "%U", format_punt_client, pci,
+ PUNT_FORMAT_FLAG_NONE);
+ }));
+ /* *INDENT-ON* */
+ }
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (punt_client_show_command, static) =
+{
+ .path = "show punt client",
+ .short_help = "show client[s] registered with the punt infra",
+ .function = punt_client_show,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+punt_reason_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ const punt_reason_data_t *pd;
+
+ vec_foreach (pd, punt_reason_data)
+ {
+ vlib_cli_output (vm, "%U", format_punt_reason_data, pd);
+ }
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (punt_reason_show_command, static) =
+{
+ .path = "show punt reasons",
+ .short_help = "show all punt reasons",
+ .function = punt_reason_show,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+punt_db_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ u32 pri, ii, jj;
+ u64 key;
+
+ /* *INDENT-OFF* */
+ hash_foreach (key, pri, punt_reg_db,
+ ({
+ vlib_cli_output (vm, " %U", format_punt_reg, pri);
+ }));
+ /* *INDENT-ON* */
+
+ vlib_cli_output (vm, "\nDerived data-plane data-base:");
+ vlib_cli_output (vm,
+ " (for each punt-reason the edge[s] from punt-dispatch)");
+
+ vec_foreach_index (ii, punt_dp_db)
+ {
+ u8 *s = NULL;
+ vlib_cli_output (vm, " %U", format_vlib_punt_reason, ii);
+
+ vec_foreach_index (jj, punt_dp_db[ii])
+ {
+ s = format (s, "%d ", punt_dp_db[ii][jj]);
+ }
+ vlib_cli_output (vm, " [%v]", s);
+ vec_free (s);
+ }
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (punt_db_show_command, static) =
+{
+ .path = "show punt db",
+ .short_help = "show the punt DB",
+ .function = punt_db_show,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+punt_stats_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ vlib_combined_counter_main_t *cm = &punt_counters;
+ vlib_counter_t c;
+ u32 ii;
+
+ for (ii = 0; ii < vlib_combined_counter_n_counters (cm); ii++)
+ {
+ vlib_get_combined_counter (cm, ii, &c);
+ vlib_cli_output (vm, "%U packets:%lld bytes:%lld",
+ format_vlib_punt_reason, ii, c.packets, c.bytes);
+ }
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (punt_stats_show_command, static) =
+{
+ .path = "show punt stats",
+ .short_help = "show the punt stats",
+ .function = punt_stats_show,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+punt_init (vlib_main_t * vm)
+{
+ punt_client_db = hash_create_vec (0, sizeof (u8), sizeof (u32));
+
+ return (NULL);
+}
+
+VLIB_INIT_FUNCTION (punt_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */