/* * Copyright (c) 2015 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. */ /* * node.c: VLIB processing nodes * * Copyright (c) 2008 Eliot Dresselhaus * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <vlib/vlib.h> #include <vlib/threads.h> /* Query node given name. */ vlib_node_t * vlib_get_node_by_name (vlib_main_t * vm, u8 * name) { vlib_node_main_t *nm = &vm->node_main; uword *p; u8 *key = name; if (!clib_mem_is_heap_object (key)) key = format (0, "%s", key); p = hash_get (nm->node_by_name, key); if (key != name) vec_free (key); return p ? vec_elt (nm->nodes, p[0]) : 0; } static void node_set_elog_name (vlib_main_t * vm, uword node_index) { vlib_node_t *n = vlib_get_node (vm, node_index); elog_event_type_t *t; t = vec_elt_at_index (vm->node_call_elog_event_types, node_index); vec_free (t->format); t->format = (char *) format (0, "%v-call: %%d%c", n->name, 0); t = vec_elt_at_index (vm->node_return_elog_event_types, node_index); vec_free (t->format); t->format = (char *) format (0, "%v-return: %%d%c", n->name, 0); n->name_elog_string = elog_string (&vm->elog_main, "%v%c", n->name, 0); } void vlib_node_rename (vlib_main_t * vm, u32 node_index, char *fmt, ...) { va_list va; vlib_node_main_t *nm = &vm->node_main; vlib_node_t *n = vlib_get_node (vm, node_index); va_start (va, fmt); hash_unset (nm->node_by_name, n->name); vec_free (n->name); n->name = va_format (0, fmt, &va); va_end (va); hash_set (nm->node_by_name, n->name, n->index); node_set_elog_name (vm, node_index); } static void vlib_node_runtime_update (vlib_main_t * vm, u32 node_index, u32 next_index) { vlib_node_main_t *nm = &vm->node_main; vlib_node_runtime_t *r, *s; vlib_node_t *node, *next_node; vlib_next_frame_t *nf; vlib_pending_frame_t *pf; i32 i, j, n_insert; ASSERT (vlib_get_thread_index () == 0); vlib_worker_thread_barrier_sync (vm); node = vec_elt (nm->nodes, node_index); r = vlib_node_get_runtime (vm, node_index); n_insert = vec_len (node->next_nodes) - r->n_next_nodes; if (n_insert > 0) { i = r->next_frame_index + r->n_next_nodes; vec_insert (nm->next_frames, n_insert, i); /* Initialize newly inserted next frames. */ for (j = 0; j < n_insert; j++) vlib_next_frame_init (nm->next_frames + i + j); /* Relocate other next frames at higher indices. */ for (j = 0; j < vec_len (nm->nodes); j++) { s = vlib_node_get_runtime (vm, j); if (j != node_index && s->next_frame_index >= i) s->next_frame_index += n_insert; } /* Pending frames may need to be relocated also. */ vec_foreach (pf, nm->pending_frames) { if (pf->next_frame_index != VLIB_PENDING_FRAME_NO_NEXT_FRAME && pf->next_frame_index >= i) pf->next_frame_index += n_insert; } /* *INDENT-OFF* */ pool_foreach (pf, nm->suspended_process_frames, ({ if (pf->next_frame_index != ~0 && pf->next_frame_index >= i) pf->next_frame_index += n_insert; })); /* *INDENT-ON* */ r->n_next_nodes = vec_len (node->next_nodes); } /* Set frame's node runtime index. */ next_node = vlib_get_node (vm, node->next_nodes[next_index]); nf = nm->next_frames + r->next_frame_index + next_index; nf->node_runtime_index = next_node->runtime_index; vlib_worker_thread_node_runtime_update (); vlib_worker_thread_barrier_release (vm); } /* Add next node to given node in given slot. */ uword vlib_node_add_next_with_slot (vlib_main_t * vm, uword node_index, uword next_node_index, uword slot) { vlib_node_main_t *nm = &vm->node_main; vlib_node_t *node, *next; uword *p; node = vec_elt (nm->nodes, node_index); next = vec_elt (nm->nodes, next_node_index); /* Runtime has to be initialized. */ ASSERT (nm->flags & VLIB_NODE_MAIN_RUNTIME_STARTED); if ((p = hash_get (node->next_slot_by_node, next_node_index))) { /* Next already exists: slot must match. */ if (slot != ~0) ASSERT (slot == p[0]); return p[0]; } if (slot == ~0) slot = vec_len (node->next_nodes); vec_validate_init_empty (node->next_nodes, slot, ~0); vec_validate (node->n_vectors_by_next_node, slot); node->next_nodes[slot] = next_node_index; hash_set (node->next_slot_by_node, next_node_index, slot); vlib_node_runtime_update (vm, node_index, slot); next->prev_node_bitmap = clib_bitmap_ori (next->prev_node_bitmap, node_index); /* Siblings all get same node structure. */ { uword sib_node_index, sib_slot; vlib_node_t *sib_node; /* *INDENT-OFF* */ clib_bitmap_foreach (sib_node_index, node->sibling_bitmap, ({ sib_node = vec_elt (nm->nodes, sib_node_index); if (sib_node != node) { sib_slot = vlib_node_add_next_with_slot (vm, sib_node_index, next_node_index, slot); ASSERT (sib_slot == slot); } })); /* *INDENT-ON* */ } return slot; } /* Add named next node to given node in given slot. */ uword vlib_node_add_named_next_with_slot (vlib_main_t * vm, uword node, char *name, uword slot) { vlib_node_main_t *nm; vlib_node_t *n, *n_next; nm = &vm->node_main; n = vlib_get_node (vm, node); n_next = vlib_get_node_by_name (vm, (u8 *) name); if (!n_next) { if (nm->flags & VLIB_NODE_MAIN_RUNTIME_STARTED) return ~0; if (slot == ~0) slot = clib_max (vec_len (n->next_node_names), vec_len (n->next_nodes)); vec_validate (n->next_node_names, slot); n->next_node_names[slot] = name; return slot; } return vlib_node_add_next_with_slot (vm, node, n_next->index, slot); } static void node_elog_init (vlib_main_t * vm, uword ni) { elog_event_type_t t; memset (&t, 0, sizeof (t)); /* 2 event types for this node: one when node function is called. One when it returns. */ vec_validate (vm->node_call_elog_event_types, ni); vm->node_call_elog_event_types[ni] = t; vec_validate (vm->node_return_elog_event_types, ni); vm->node_return_elog_event_types[ni] = t; node_set_elog_name (vm, ni); } #ifdef CLIB_UNIX #define STACK_ALIGN (clib_mem_get_page_size()) #else #define STACK_ALIGN CLIB_CACHE_LINE_BYTES #endif static void register_node (vlib_main_t * vm, vlib_node_registration_t * r) { vlib_node_main_t *nm = &vm->node_main; vlib_node_t *n; u32 page_size = clib_mem_get_page_size (); int i; if (CLIB_DEBUG > 0) { /* Default (0) type should match INTERNAL. */ vlib_node_t zero = { 0 }; ASSERT (VLIB_NODE_TYPE_INTERNAL == zero.type); } ASSERT (r->function != 0); n = clib_mem_alloc_no_fail (sizeof (n[0])); memset (n, 0, sizeof (n[0])); n->index = vec_len (nm->nodes); vec_add1 (nm->nodes, n); /* Name is always a vector so it can be formatted with %v. */ if (clib_mem_is_heap_object (vec_header (r->name, 0))) n->name = vec_dup ((u8 *) r->name); else n->name = format (0, "%s", r->name); if (!nm->node_by_name) nm->node_by_name = hash_create_vec ( /* size */ 32, sizeof (n->name[0]), sizeof (uword)); /* Node names must be unique. */ { vlib_node_t *o = vlib_get_node_by_name (vm, n->name); if (o) clib_error ("more than one node named `%v'", n->name); } hash_set (nm->node_by_name, n->name, n->index); r->index = n->index; /* save index in registration */ n->function = r->function; /* Node index of next sibling will be filled in by vlib_node_main_init. */ n->sibling_of = r->sibling_of; if (r->sibling_of && r->n_next_nodes > 0) clib_error ("sibling node should not have any next nodes `%v'", n->name); if (r->type == VLIB_NODE_TYPE_INTERNAL) ASSERT (r->vector_size > 0); #define _(f) n->f = r->f _(type); _(flags); _(state); _(scalar_size); _(vector_size); _(format_buffer); _(unformat_buffer); _(format_trace); _(validate_frame); /* Register error counters. */ vlib_register_errors (vm, n->index, r->n_errors, r->error_strings); node_elog_init (vm, n->index); _(runtime_data_bytes); if (r->runtime_data_bytes > 0) { vec_resize (n->runtime_data, r->runtime_data_bytes); if (r->runtime_data) clib_memcpy (n->runtime_data, r->runtime_data, r->runtime_data_bytes); } vec_resize (n->next_node_names, r->n_next_nodes); for (i = 0; i < r->n_next_nodes; i++) n->next_node_names[i] = r->next_nodes[i]; vec_validate_init_empty (n->next_nodes, r->n_next_nodes - 1, ~0); vec_validate (n->n_vectors_by_next_node, r->n_next_nodes - 1); n->owner_node_index = n->owner_next_index = ~0; /* Initialize node runtime. */ { vlib_node_runtime_t *rt; u32 i; if (n->type == VLIB_NODE_TYPE_PROCESS) { vlib_process_t *p; uword log2_n_stack_bytes; log2_n_stack_bytes = clib_max (r->process_log2_n_stack_bytes, 15); #ifdef CLIB_UNIX /* * Bump the stack size if running over a kernel with a large page size, * and the stack isn't any too big to begin with. Otherwise, we'll * trip over the stack guard page for sure. */ if ((page_size > (4 << 10)) && log2_n_stack_bytes < 19) { if ((1 << log2_n_stack_bytes) <= page_size) log2_n_stack_bytes = min_log2 (page_size) + 1; else log2_n_stack_bytes++; } #endif p = clib_mem_alloc_aligned_at_offset (sizeof (p[0]) + (1 << log2_n_stack_bytes), STACK_ALIGN, STRUCT_OFFSET_OF (vlib_process_t, stack), 0 /* no, don't call os_out_of_memory */ ); if (p == 0) clib_panic ("failed to allocate process stack (%d bytes)", 1 << log2_n_stack_bytes); memset (p, 0, sizeof (p[0])); p->log2_n_stack_bytes = log2_n_stack_bytes; /* Process node's runtime index is really index into process pointer vector. */ n->runtime_index = vec_len (nm->processes); vec_add1 (nm->processes, p); /* Paint first stack word with magic number so we can at least detect process stack overruns. */ p->stack[0] = VLIB_PROCESS_STACK_MAGIC; /* Node runtime is stored inside of process. */ rt = &p->node_runtime; #ifdef CLIB_UNIX /* * Disallow writes to the bottom page of the stack, to * catch stack overflows. */ if (mprotect (p->stack, page_size, PROT_READ) < 0) clib_unix_warning ("process stack"); #endif } else { vec_add2_aligned (nm->nodes_by_type[n->type], rt, 1, /* align */ CLIB_CACHE_LINE_BYTES); n->runtime_index = rt - nm->nodes_by_type[n->type]; } if (n->type == VLIB_NODE_TYPE_INPUT) nm->input_node_counts_by_state[n->state] += 1; rt->function = n->function; rt->flags = n->flags; rt->state = n->state; rt->node_index = n->index; rt->n_next_nodes = r->n_next_nodes; rt->next_frame_index = vec_len (nm->next_frames); vec_resize (nm->next_frames, rt->n_next_nodes); for (i = 0; i < rt->n_next_nodes; i++) vlib_next_frame_init (nm->next_frames + rt->next_frame_index + i); vec_resize (rt->errors, r->n_errors); for (i = 0; i < vec_len (rt->errors); i++) rt->errors[i] = vlib_error_set (n->index, i); STATIC_ASSERT_SIZEOF (vlib_node_runtime_t, 128); ASSERT (vec_len (n->runtime_data) <= VLIB_NODE_RUNTIME_DATA_SIZE); if (vec_len (n->runtime_data) > 0) clib_memcpy (rt->runtime_data, n->runtime_data, vec_len (n->runtime_data)); vec_free (n->runtime_data); } } /* Register new packet processing node. */ u32 vlib_register_node (vlib_main_t * vm, vlib_node_registration_t * r) { register_node (vm, r); return r->index; } static uword null_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u16 n_vectors = frame->n_vectors; vlib_node_increment_counter (vm, node->node_index, 0, n_vectors); vlib_buffer_free (vm, vlib_frame_args (frame), n_vectors); vlib_frame_free (vm, node, frame); return n_vectors; } void vlib_register_all_static_nodes (vlib_main_t * vm) { vlib_node_registration_t *r; static char *null_node_error_strings[] = { "blackholed packets", }; static vlib_node_registration_t null_node_reg = { .function = null_node_fn, .vector_size = sizeof (u32), .name = "null-node", .n_errors = 1, .error_strings = null_node_error_strings, }; /* make sure that node index 0 is not used by real node */ register_node (vm, &null_node_reg); r = vm->node_main.node_registrations; while (r) { register_node (vm, r); r = r->next_registration; } } clib_error_t * vlib_node_main_init (vlib_main_t * vm) { vlib_node_main_t *nm = &vm->node_main; clib_error_t *error = 0; vlib_node_t *n; uword ni; nm->flags |= VLIB_NODE_MAIN_RUNTIME_STARTED; /* Generate sibling relationships */ { vlib_node_t *n, *sib; uword si; for (ni = 0; ni < vec_len (nm->nodes); ni++) { n = vec_elt (nm->nodes, ni); if (!n->sibling_of) continue; sib = vlib_get_node_by_name (vm, (u8 *) n->sibling_of); if (!sib) { error = clib_error_create ("sibling `%s' not found for node `%v'", n->sibling_of, n->name); goto done; } /* *INDENT-OFF* */ clib_bitmap_foreach (si, sib->sibling_bitmap, ({ vlib_node_t * m = vec_elt (nm->nodes, si); /* Connect all of sibling's siblings to us. */ m->sibling_bitmap = clib_bitmap_ori (m->sibling_bitmap, n->index); /* Connect us to all of sibling's siblings. */ n->sibling_bitmap = clib_bitmap_ori (n->sibling_bitmap, si); })); /* *INDENT-ON* */ /* Connect sibling to us. */ sib->sibling_bitmap = clib_bitmap_ori (sib->sibling_bitmap, n->index); /* Connect us to sibling. */ n->sibling_bitmap = clib_bitmap_ori (n->sibling_bitmap, sib->index); } } /* Resolve next names into next indices. */ for (ni = 0; ni < vec_len (nm->nodes); ni++) { uword i; n = vec_elt (nm->nodes, ni); for (i = 0; i < vec_len (n->next_node_names); i++) { char *a = n->next_node_names[i]; if (!a) continue; if (~0 == vlib_node_add_named_next_with_slot (vm, n->index, a, i)) { error = clib_error_create ("node `%v' refers to unknown node `%s'", n->name, a); goto done; } } vec_free (n->next_node_names); } /* Set previous node pointers. */ for (ni = 0; ni < vec_len (nm->nodes); ni++) { vlib_node_t *n_next; uword i; n = vec_elt (nm->nodes, ni); for (i = 0; i < vec_len (n->next_nodes); i++) { if (n->next_nodes[i] >= vec_len (nm->nodes)) continue; n_next = vec_elt (nm->nodes, n->next_nodes[i]); n_next->prev_node_bitmap = clib_bitmap_ori (n_next->prev_node_bitmap, n->index); } } { vlib_next_frame_t *nf; vlib_node_runtime_t *r; vlib_node_t *next; uword i; vec_foreach (r, nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL]) { if (r->n_next_nodes == 0) continue; n = vlib_get_node (vm, r->node_index); nf = vec_elt_at_index (nm->next_frames, r->next_frame_index); for (i = 0; i < vec_len (n->next_nodes); i++) { next = vlib_get_node (vm, n->next_nodes[i]); /* Validate node runtime indices are correctly initialized. */ ASSERT (nf[i].node_runtime_index == next->runtime_index); nf[i].flags = 0; if (next->flags & VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH) nf[i].flags |= VLIB_FRAME_NO_FREE_AFTER_DISPATCH; } } } done: return error; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */