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dccf863d79ee59ff1e86b3b308671648a1d5642c
vpp/src/vlib/main.c
Damjan Marion dccf863d79 vppinfra: allow handoff to main thread 
Type: improvement
Change-Id: If2e907967c9b75997b581ff0c058bd5c15e823f5
Signed-off-by: Damjan Marion <damarion@cisco.com>
(cherry picked from commit f6e6c78807)
2020-09-24 12:15:52 +00:00

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/*
* 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.
*/
/*
* main.c: main vector processing loop
*
* 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 <math.h>
#include <vppinfra/format.h>
#include <vlib/vlib.h>
#include <vlib/threads.h>
#include <vppinfra/tw_timer_1t_3w_1024sl_ov.h>
#include <vlib/unix/unix.h>
/* Actually allocate a few extra slots of vector data to support
speculative vector enqueues which overflow vector data in next frame. */
#define VLIB_FRAME_SIZE_ALLOC (VLIB_FRAME_SIZE + 4)
always_inline u32
vlib_frame_bytes (u32 n_scalar_bytes, u32 n_vector_bytes)
{
u32 n_bytes;
/* Make room for vlib_frame_t plus scalar arguments. */
n_bytes = vlib_frame_vector_byte_offset (n_scalar_bytes);
/* Make room for vector arguments.
Allocate a few extra slots of vector data to support
speculative vector enqueues which overflow vector data in next frame. */
#define VLIB_FRAME_SIZE_EXTRA 4
n_bytes += (VLIB_FRAME_SIZE + VLIB_FRAME_SIZE_EXTRA) * n_vector_bytes;
/* Magic number is first 32bit number after vector data.
Used to make sure that vector data is never overrun. */
#define VLIB_FRAME_MAGIC (0xabadc0ed)
n_bytes += sizeof (u32);
/* Pad to cache line. */
n_bytes = round_pow2 (n_bytes, CLIB_CACHE_LINE_BYTES);
return n_bytes;
}
always_inline u32 *
vlib_frame_find_magic (vlib_frame_t * f, vlib_node_t * node)
{
void *p = f;
p += vlib_frame_vector_byte_offset (node->scalar_size);
p += (VLIB_FRAME_SIZE + VLIB_FRAME_SIZE_EXTRA) * node->vector_size;
return p;
}
static inline vlib_frame_size_t *
get_frame_size_info (vlib_node_main_t * nm,
u32 n_scalar_bytes, u32 n_vector_bytes)
{
#ifdef VLIB_SUPPORTS_ARBITRARY_SCALAR_SIZES
uword key = (n_scalar_bytes << 16) | n_vector_bytes;
uword *p, i;
p = hash_get (nm->frame_size_hash, key);
if (p)
i = p[0];
else
{
i = vec_len (nm->frame_sizes);
vec_validate (nm->frame_sizes, i);
hash_set (nm->frame_size_hash, key, i);
}
return vec_elt_at_index (nm->frame_sizes, i);
#else
ASSERT (vlib_frame_bytes (n_scalar_bytes, n_vector_bytes)
== (vlib_frame_bytes (0, 4)));
return vec_elt_at_index (nm->frame_sizes, 0);
#endif
}
static vlib_frame_t *
vlib_frame_alloc_to_node (vlib_main_t * vm, u32 to_node_index,
u32 frame_flags)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_frame_size_t *fs;
vlib_node_t *to_node;
vlib_frame_t *f;
u32 l, n, scalar_size, vector_size;
to_node = vlib_get_node (vm, to_node_index);
scalar_size = to_node->scalar_size;
vector_size = to_node->vector_size;
fs = get_frame_size_info (nm, scalar_size, vector_size);
n = vlib_frame_bytes (scalar_size, vector_size);
if ((l = vec_len (fs->free_frames)) > 0)
{
/* Allocate from end of free list. */
f = fs->free_frames[l - 1];
_vec_len (fs->free_frames) = l - 1;
}
else
{
f = clib_mem_alloc_aligned_no_fail (n, VLIB_FRAME_ALIGN);
}
/* Poison frame when debugging. */
if (CLIB_DEBUG > 0)
clib_memset (f, 0xfe, n);
/* Insert magic number. */
{
u32 *magic;
magic = vlib_frame_find_magic (f, to_node);
*magic = VLIB_FRAME_MAGIC;
}
f->frame_flags = VLIB_FRAME_IS_ALLOCATED | frame_flags;
f->n_vectors = 0;
f->scalar_size = scalar_size;
f->vector_size = vector_size;
f->flags = 0;
fs->n_alloc_frames += 1;
return f;
}
/* Allocate a frame for from FROM_NODE to TO_NODE via TO_NEXT_INDEX.
Returns frame index. */
static vlib_frame_t *
vlib_frame_alloc (vlib_main_t * vm, vlib_node_runtime_t * from_node_runtime,
u32 to_next_index)
{
vlib_node_t *from_node;
from_node = vlib_get_node (vm, from_node_runtime->node_index);
ASSERT (to_next_index < vec_len (from_node->next_nodes));
return vlib_frame_alloc_to_node (vm, from_node->next_nodes[to_next_index],
/* frame_flags */ 0);
}
vlib_frame_t *
vlib_get_frame_to_node (vlib_main_t * vm, u32 to_node_index)
{
vlib_frame_t *f = vlib_frame_alloc_to_node (vm, to_node_index,
/* frame_flags */
VLIB_FRAME_FREE_AFTER_DISPATCH);
return vlib_get_frame (vm, f);
}
static inline void
vlib_validate_frame_indices (vlib_frame_t * f)
{
if (CLIB_DEBUG > 0)
{
int i;
u32 *from = vlib_frame_vector_args (f);
/* Check for bad buffer index values */
for (i = 0; i < f->n_vectors; i++)
{
if (from[i] == 0)
{
clib_warning ("BUG: buffer index 0 at index %d", i);
ASSERT (0);
}
else if (from[i] == 0xfefefefe)
{
clib_warning ("BUG: frame poison pattern at index %d", i);
ASSERT (0);
}
}
}
}
void
vlib_put_frame_to_node (vlib_main_t * vm, u32 to_node_index, vlib_frame_t * f)
{
vlib_pending_frame_t *p;
vlib_node_t *to_node;
if (f->n_vectors == 0)
return;
vlib_validate_frame_indices (f);
to_node = vlib_get_node (vm, to_node_index);
vec_add2 (vm->node_main.pending_frames, p, 1);
f->frame_flags |= VLIB_FRAME_PENDING;
p->frame = vlib_get_frame (vm, f);
p->node_runtime_index = to_node->runtime_index;
p->next_frame_index = VLIB_PENDING_FRAME_NO_NEXT_FRAME;
}
/* Free given frame. */
void
vlib_frame_free (vlib_main_t * vm, vlib_node_runtime_t * r, vlib_frame_t * f)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_node_t *node;
vlib_frame_size_t *fs;
ASSERT (f->frame_flags & VLIB_FRAME_IS_ALLOCATED);
node = vlib_get_node (vm, r->node_index);
fs = get_frame_size_info (nm, node->scalar_size, node->vector_size);
ASSERT (f->frame_flags & VLIB_FRAME_IS_ALLOCATED);
/* No next frames may point to freed frame. */
if (CLIB_DEBUG > 0)
{
vlib_next_frame_t *nf;
vec_foreach (nf, vm->node_main.next_frames) ASSERT (nf->frame != f);
}
f->frame_flags &= ~(VLIB_FRAME_IS_ALLOCATED | VLIB_FRAME_NO_APPEND);
vec_add1 (fs->free_frames, f);
ASSERT (fs->n_alloc_frames > 0);
fs->n_alloc_frames -= 1;
}
static clib_error_t *
show_frame_stats (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_frame_size_t *fs;
vlib_cli_output (vm, "%=6s%=12s%=12s", "Size", "# Alloc", "# Free");
vec_foreach (fs, nm->frame_sizes)
{
u32 n_alloc = fs->n_alloc_frames;
u32 n_free = vec_len (fs->free_frames);
if (n_alloc + n_free > 0)
vlib_cli_output (vm, "%=6d%=12d%=12d",
fs - nm->frame_sizes, n_alloc, n_free);
}
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_frame_stats_cli, static) = {
.path = "show vlib frame-allocation",
.short_help = "Show node dispatch frame statistics",
.function = show_frame_stats,
};
/* *INDENT-ON* */
/* Change ownership of enqueue rights to given next node. */
static void
vlib_next_frame_change_ownership (vlib_main_t * vm,
vlib_node_runtime_t * node_runtime,
u32 next_index)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_next_frame_t *next_frame;
vlib_node_t *node, *next_node;
node = vec_elt (nm->nodes, node_runtime->node_index);
/* Only internal & input nodes are allowed to call other nodes. */
ASSERT (node->type == VLIB_NODE_TYPE_INTERNAL
|| node->type == VLIB_NODE_TYPE_INPUT
|| node->type == VLIB_NODE_TYPE_PROCESS);
ASSERT (vec_len (node->next_nodes) == node_runtime->n_next_nodes);
next_frame =
vlib_node_runtime_get_next_frame (vm, node_runtime, next_index);
next_node = vec_elt (nm->nodes, node->next_nodes[next_index]);
if (next_node->owner_node_index != VLIB_INVALID_NODE_INDEX)
{
/* Get frame from previous owner. */
vlib_next_frame_t *owner_next_frame;
vlib_next_frame_t tmp;
owner_next_frame =
vlib_node_get_next_frame (vm,
next_node->owner_node_index,
next_node->owner_next_index);
/* Swap target next frame with owner's. */
tmp = owner_next_frame[0];
owner_next_frame[0] = next_frame[0];
next_frame[0] = tmp;
/*
* If next_frame is already pending, we have to track down
* all pending frames and fix their next_frame_index fields.
*/
if (next_frame->flags & VLIB_FRAME_PENDING)
{
vlib_pending_frame_t *p;
if (next_frame->frame != NULL)
{
vec_foreach (p, nm->pending_frames)
{
if (p->frame == next_frame->frame)
{
p->next_frame_index =
next_frame - vm->node_main.next_frames;
}
}
}
}
}
else
{
/* No previous owner. Take ownership. */
next_frame->flags |= VLIB_FRAME_OWNER;
}
/* Record new owner. */
next_node->owner_node_index = node->index;
next_node->owner_next_index = next_index;
/* Now we should be owner. */
ASSERT (next_frame->flags & VLIB_FRAME_OWNER);
}
/* Make sure that magic number is still there.
Otherwise, it is likely that caller has overrun frame arguments. */
always_inline void
validate_frame_magic (vlib_main_t * vm,
vlib_frame_t * f, vlib_node_t * n, uword next_index)
{
vlib_node_t *next_node = vlib_get_node (vm, n->next_nodes[next_index]);
u32 *magic = vlib_frame_find_magic (f, next_node);
ASSERT (VLIB_FRAME_MAGIC == magic[0]);
}
vlib_frame_t *
vlib_get_next_frame_internal (vlib_main_t * vm,
vlib_node_runtime_t * node,
u32 next_index, u32 allocate_new_next_frame)
{
vlib_frame_t *f;
vlib_next_frame_t *nf;
u32 n_used;
nf = vlib_node_runtime_get_next_frame (vm, node, next_index);
/* Make sure this next frame owns right to enqueue to destination frame. */
if (PREDICT_FALSE (!(nf->flags & VLIB_FRAME_OWNER)))
vlib_next_frame_change_ownership (vm, node, next_index);
/* ??? Don't need valid flag: can use frame_index == ~0 */
if (PREDICT_FALSE (!(nf->flags & VLIB_FRAME_IS_ALLOCATED)))
{
nf->frame = vlib_frame_alloc (vm, node, next_index);
nf->flags |= VLIB_FRAME_IS_ALLOCATED;
}
f = nf->frame;
/* Has frame been removed from pending vector (e.g. finished dispatching)?
If so we can reuse frame. */
if ((nf->flags & VLIB_FRAME_PENDING)
&& !(f->frame_flags & VLIB_FRAME_PENDING))
{
nf->flags &= ~VLIB_FRAME_PENDING;
f->n_vectors = 0;
f->flags = 0;
}
/* Allocate new frame if current one is marked as no-append or
it is already full. */
n_used = f->n_vectors;
if (n_used >= VLIB_FRAME_SIZE || (allocate_new_next_frame && n_used > 0) ||
(f->frame_flags & VLIB_FRAME_NO_APPEND))
{
/* Old frame may need to be freed after dispatch, since we'll have
two redundant frames from node -> next node. */
if (!(nf->flags & VLIB_FRAME_NO_FREE_AFTER_DISPATCH))
{
vlib_frame_t *f_old = vlib_get_frame (vm, nf->frame);
f_old->frame_flags |= VLIB_FRAME_FREE_AFTER_DISPATCH;
}
/* Allocate new frame to replace full one. */
f = nf->frame = vlib_frame_alloc (vm, node, next_index);
n_used = f->n_vectors;
}
/* Should have free vectors in frame now. */
ASSERT (n_used < VLIB_FRAME_SIZE);
if (CLIB_DEBUG > 0)
{
validate_frame_magic (vm, f,
vlib_get_node (vm, node->node_index), next_index);
}
return f;
}
static void
vlib_put_next_frame_validate (vlib_main_t * vm,
vlib_node_runtime_t * rt,
u32 next_index, u32 n_vectors_left)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_next_frame_t *nf;
vlib_frame_t *f;
vlib_node_runtime_t *next_rt;
vlib_node_t *next_node;
u32 n_before, n_after;
nf = vlib_node_runtime_get_next_frame (vm, rt, next_index);
f = vlib_get_frame (vm, nf->frame);
ASSERT (n_vectors_left <= VLIB_FRAME_SIZE);
vlib_validate_frame_indices (f);
n_after = VLIB_FRAME_SIZE - n_vectors_left;
n_before = f->n_vectors;
ASSERT (n_after >= n_before);
next_rt = vec_elt_at_index (nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL],
nf->node_runtime_index);
next_node = vlib_get_node (vm, next_rt->node_index);
if (n_after > 0 && next_node->validate_frame)
{
u8 *msg = next_node->validate_frame (vm, rt, f);
if (msg)
{
clib_warning ("%v", msg);
ASSERT (0);
}
vec_free (msg);
}
}
void
vlib_put_next_frame (vlib_main_t * vm,
vlib_node_runtime_t * r,
u32 next_index, u32 n_vectors_left)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_next_frame_t *nf;
vlib_frame_t *f;
u32 n_vectors_in_frame;
if (CLIB_DEBUG > 0)
vlib_put_next_frame_validate (vm, r, next_index, n_vectors_left);
nf = vlib_node_runtime_get_next_frame (vm, r, next_index);
f = vlib_get_frame (vm, nf->frame);
/* Make sure that magic number is still there. Otherwise, caller
has overrun frame meta data. */
if (CLIB_DEBUG > 0)
{
vlib_node_t *node = vlib_get_node (vm, r->node_index);
validate_frame_magic (vm, f, node, next_index);
}
/* Convert # of vectors left -> number of vectors there. */
ASSERT (n_vectors_left <= VLIB_FRAME_SIZE);
n_vectors_in_frame = VLIB_FRAME_SIZE - n_vectors_left;
f->n_vectors = n_vectors_in_frame;
/* If vectors were added to frame, add to pending vector. */
if (PREDICT_TRUE (n_vectors_in_frame > 0))
{
vlib_pending_frame_t *p;
u32 v0, v1;
r->cached_next_index = next_index;
if (!(f->frame_flags & VLIB_FRAME_PENDING))
{
__attribute__ ((unused)) vlib_node_t *node;
vlib_node_t *next_node;
vlib_node_runtime_t *next_runtime;
node = vlib_get_node (vm, r->node_index);
next_node = vlib_get_next_node (vm, r->node_index, next_index);
next_runtime = vlib_node_get_runtime (vm, next_node->index);
vec_add2 (nm->pending_frames, p, 1);
p->frame = nf->frame;
p->node_runtime_index = nf->node_runtime_index;
p->next_frame_index = nf - nm->next_frames;
nf->flags |= VLIB_FRAME_PENDING;
f->frame_flags |= VLIB_FRAME_PENDING;
/*
* If we're going to dispatch this frame on another thread,
* force allocation of a new frame. Otherwise, we create
* a dangling frame reference. Each thread has its own copy of
* the next_frames vector.
*/
if (0 && r->thread_index != next_runtime->thread_index)
{
nf->frame = NULL;
nf->flags &= ~(VLIB_FRAME_PENDING | VLIB_FRAME_IS_ALLOCATED);
}
}
/* Copy trace flag from next_frame and from runtime. */
nf->flags |=
(nf->flags & VLIB_NODE_FLAG_TRACE) | (r->
flags & VLIB_NODE_FLAG_TRACE);
v0 = nf->vectors_since_last_overflow;
v1 = v0 + n_vectors_in_frame;
nf->vectors_since_last_overflow = v1;
if (PREDICT_FALSE (v1 < v0))
{
vlib_node_t *node = vlib_get_node (vm, r->node_index);
vec_elt (node->n_vectors_by_next_node, next_index) += v0;
}
}
}
/* Sync up runtime (32 bit counters) and main node stats (64 bit counters). */
never_inline void
vlib_node_runtime_sync_stats (vlib_main_t * vm,
vlib_node_runtime_t * r,
uword n_calls, uword n_vectors, uword n_clocks)
{
vlib_node_t *n = vlib_get_node (vm, r->node_index);
n->stats_total.calls += n_calls + r->calls_since_last_overflow;
n->stats_total.vectors += n_vectors + r->vectors_since_last_overflow;
n->stats_total.clocks += n_clocks + r->clocks_since_last_overflow;
n->stats_total.max_clock = r->max_clock;
n->stats_total.max_clock_n = r->max_clock_n;
r->calls_since_last_overflow = 0;
r->vectors_since_last_overflow = 0;
r->clocks_since_last_overflow = 0;
}
always_inline void __attribute__ ((unused))
vlib_process_sync_stats (vlib_main_t * vm,
vlib_process_t * p,
uword n_calls, uword n_vectors, uword n_clocks)
{
vlib_node_runtime_t *rt = &p->node_runtime;
vlib_node_t *n = vlib_get_node (vm, rt->node_index);
vlib_node_runtime_sync_stats (vm, rt, n_calls, n_vectors, n_clocks);
n->stats_total.suspends += p->n_suspends;
p->n_suspends = 0;
}
void
vlib_node_sync_stats (vlib_main_t * vm, vlib_node_t * n)
{
vlib_node_runtime_t *rt;
if (n->type == VLIB_NODE_TYPE_PROCESS)
{
/* Nothing to do for PROCESS nodes except in main thread */
if (vm != &vlib_global_main)
return;
vlib_process_t *p = vlib_get_process_from_node (vm, n);
n->stats_total.suspends += p->n_suspends;
p->n_suspends = 0;
rt = &p->node_runtime;
}
else
rt =
vec_elt_at_index (vm->node_main.nodes_by_type[n->type],
n->runtime_index);
vlib_node_runtime_sync_stats (vm, rt, 0, 0, 0);
/* Sync up runtime next frame vector counters with main node structure. */
{
vlib_next_frame_t *nf;
uword i;
for (i = 0; i < rt->n_next_nodes; i++)
{
nf = vlib_node_runtime_get_next_frame (vm, rt, i);
vec_elt (n->n_vectors_by_next_node, i) +=
nf->vectors_since_last_overflow;
nf->vectors_since_last_overflow = 0;
}
}
}
always_inline u32
vlib_node_runtime_update_stats (vlib_main_t * vm,
vlib_node_runtime_t * node,
uword n_calls,
uword n_vectors, uword n_clocks)
{
u32 ca0, ca1, v0, v1, cl0, cl1, r;
cl0 = cl1 = node->clocks_since_last_overflow;
ca0 = ca1 = node->calls_since_last_overflow;
v0 = v1 = node->vectors_since_last_overflow;
ca1 = ca0 + n_calls;
v1 = v0 + n_vectors;
cl1 = cl0 + n_clocks;
node->calls_since_last_overflow = ca1;
node->clocks_since_last_overflow = cl1;
node->vectors_since_last_overflow = v1;
node->max_clock_n = node->max_clock > n_clocks ?
node->max_clock_n : n_vectors;
node->max_clock = node->max_clock > n_clocks ? node->max_clock : n_clocks;
r = vlib_node_runtime_update_main_loop_vector_stats (vm, node, n_vectors);
if (PREDICT_FALSE (ca1 < ca0 || v1 < v0 || cl1 < cl0))
{
node->calls_since_last_overflow = ca0;
node->clocks_since_last_overflow = cl0;
node->vectors_since_last_overflow = v0;
vlib_node_runtime_sync_stats (vm, node, n_calls, n_vectors, n_clocks);
}
return r;
}
always_inline void
vlib_process_update_stats (vlib_main_t * vm,
vlib_process_t * p,
uword n_calls, uword n_vectors, uword n_clocks)
{
vlib_node_runtime_update_stats (vm, &p->node_runtime,
n_calls, n_vectors, n_clocks);
}
static clib_error_t *
vlib_cli_elog_clear (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
elog_reset_buffer (&vm->elog_main);
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (elog_clear_cli, static) = {
.path = "event-logger clear",
.short_help = "Clear the event log",
.function = vlib_cli_elog_clear,
};
/* *INDENT-ON* */
#ifdef CLIB_UNIX
static clib_error_t *
elog_save_buffer (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
elog_main_t *em = &vm->elog_main;
char *file, *chroot_file;
clib_error_t *error = 0;
if (!unformat (input, "%s", &file))
{
vlib_cli_output (vm, "expected file name, got `%U'",
format_unformat_error, input);
return 0;
}
/* It's fairly hard to get "../oopsie" through unformat; just in case */
if (strstr (file, "..") || index (file, '/'))
{
vlib_cli_output (vm, "illegal characters in filename '%s'", file);
return 0;
}
chroot_file = (char *) format (0, "/tmp/%s%c", file, 0);
vec_free (file);
vlib_cli_output (vm, "Saving %wd of %wd events to %s",
elog_n_events_in_buffer (em),
elog_buffer_capacity (em), chroot_file);
vlib_worker_thread_barrier_sync (vm);
error = elog_write_file (em, chroot_file, 1 /* flush ring */ );
vlib_worker_thread_barrier_release (vm);
vec_free (chroot_file);
return error;
}
void
elog_post_mortem_dump (void)
{
vlib_main_t *vm = &vlib_global_main;
elog_main_t *em = &vm->elog_main;
u8 *filename;
clib_error_t *error;
if (!vm->elog_post_mortem_dump)
return;
filename = format (0, "/tmp/elog_post_mortem.%d%c", getpid (), 0);
error = elog_write_file (em, (char *) filename, 1 /* flush ring */ );
if (error)
clib_error_report (error);
vec_free (filename);
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (elog_save_cli, static) = {
.path = "event-logger save",
.short_help = "event-logger save <filename> (saves log in /tmp/<filename>)",
.function = elog_save_buffer,
};
/* *INDENT-ON* */
static clib_error_t *
elog_stop (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
elog_main_t *em = &vm->elog_main;
em->n_total_events_disable_limit = em->n_total_events;
vlib_cli_output (vm, "Stopped the event logger...");
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (elog_stop_cli, static) = {
.path = "event-logger stop",
.short_help = "Stop the event-logger",
.function = elog_stop,
};
/* *INDENT-ON* */
static clib_error_t *
elog_restart (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
elog_main_t *em = &vm->elog_main;
em->n_total_events_disable_limit = ~0;
vlib_cli_output (vm, "Restarted the event logger...");
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (elog_restart_cli, static) = {
.path = "event-logger restart",
.short_help = "Restart the event-logger",
.function = elog_restart,
};
/* *INDENT-ON* */
static clib_error_t *
elog_resize (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
elog_main_t *em = &vm->elog_main;
u32 tmp;
/* Stop the parade */
elog_reset_buffer (&vm->elog_main);
if (unformat (input, "%d", &tmp))
{
elog_alloc (em, tmp);
em->n_total_events_disable_limit = ~0;
}
else
return clib_error_return (0, "Must specify how many events in the ring");
vlib_cli_output (vm, "Resized ring and restarted the event logger...");
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (elog_resize_cli, static) = {
.path = "event-logger resize",
.short_help = "event-logger resize <nnn>",
.function = elog_resize,
};
/* *INDENT-ON* */
#endif /* CLIB_UNIX */
static void
elog_show_buffer_internal (vlib_main_t * vm, u32 n_events_to_show)
{
elog_main_t *em = &vm->elog_main;
elog_event_t *e, *es;
f64 dt;
/* Show events in VLIB time since log clock starts after VLIB clock. */
dt = (em->init_time.cpu - vm->clib_time.init_cpu_time)
* vm->clib_time.seconds_per_clock;
es = elog_peek_events (em);
vlib_cli_output (vm, "%d of %d events in buffer, logger %s", vec_len (es),
em->event_ring_size,
em->n_total_events < em->n_total_events_disable_limit ?
"running" : "stopped");
vec_foreach (e, es)
{
vlib_cli_output (vm, "%18.9f: %U",
e->time + dt, format_elog_event, em, e);
n_events_to_show--;
if (n_events_to_show == 0)
break;
}
vec_free (es);
}
static clib_error_t *
elog_show_buffer (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
u32 n_events_to_show;
clib_error_t *error = 0;
n_events_to_show = 250;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "%d", &n_events_to_show))
;
else if (unformat (input, "all"))
n_events_to_show = ~0;
else
return unformat_parse_error (input);
}
elog_show_buffer_internal (vm, n_events_to_show);
return error;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (elog_show_cli, static) = {
.path = "show event-logger",
.short_help = "Show event logger info",
.function = elog_show_buffer,
};
/* *INDENT-ON* */
void
vlib_gdb_show_event_log (void)
{
elog_show_buffer_internal (vlib_get_main (), (u32) ~ 0);
}
static inline void
vlib_elog_main_loop_event (vlib_main_t * vm,
u32 node_index,
u64 time, u32 n_vectors, u32 is_return)
{
vlib_main_t *evm = &vlib_global_main;
elog_main_t *em = &evm->elog_main;
int enabled = evm->elog_trace_graph_dispatch |
evm->elog_trace_graph_circuit;
if (PREDICT_FALSE (enabled && n_vectors))
{
if (PREDICT_FALSE (!elog_is_enabled (em)))
{
evm->elog_trace_graph_dispatch = 0;
evm->elog_trace_graph_circuit = 0;
return;
}
if (PREDICT_TRUE
(evm->elog_trace_graph_dispatch ||
(evm->elog_trace_graph_circuit &&
node_index == evm->elog_trace_graph_circuit_node_index)))
{
elog_track (em,
/* event type */
vec_elt_at_index (is_return
? evm->node_return_elog_event_types
: evm->node_call_elog_event_types,
node_index),
/* track */
(vm->thread_index ?
&vlib_worker_threads[vm->thread_index].elog_track
: &em->default_track),
/* data to log */ n_vectors);
}
}
}
#if VLIB_BUFFER_TRACE_TRAJECTORY > 0
void (*vlib_buffer_trace_trajectory_cb) (vlib_buffer_t * b, u32 node_index);
void (*vlib_buffer_trace_trajectory_init_cb) (vlib_buffer_t * b);
void
vlib_buffer_trace_trajectory_init (vlib_buffer_t * b)
{
if (PREDICT_TRUE (vlib_buffer_trace_trajectory_init_cb != 0))
{
(*vlib_buffer_trace_trajectory_init_cb) (b);
}
}
#endif
static inline void
add_trajectory_trace (vlib_buffer_t * b, u32 node_index)
{
#if VLIB_BUFFER_TRACE_TRAJECTORY > 0
if (PREDICT_TRUE (vlib_buffer_trace_trajectory_cb != 0))
{
(*vlib_buffer_trace_trajectory_cb) (b, node_index);
}
#endif
}
u8 *format_vnet_buffer_flags (u8 * s, va_list * args) __attribute__ ((weak));
u8 *
format_vnet_buffer_flags (u8 * s, va_list * args)
{
s = format (s, "BUG STUB %s", __FUNCTION__);
return s;
}
u8 *format_vnet_buffer_opaque (u8 * s, va_list * args) __attribute__ ((weak));
u8 *
format_vnet_buffer_opaque (u8 * s, va_list * args)
{
s = format (s, "BUG STUB %s", __FUNCTION__);
return s;
}
u8 *format_vnet_buffer_opaque2 (u8 * s, va_list * args)
__attribute__ ((weak));
u8 *
format_vnet_buffer_opaque2 (u8 * s, va_list * args)
{
s = format (s, "BUG STUB %s", __FUNCTION__);
return s;
}
static u8 *
format_buffer_metadata (u8 * s, va_list * args)
{
vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
s = format (s, "flags: %U\n", format_vnet_buffer_flags, b);
s = format (s, "current_data: %d, current_length: %d\n",
(i32) (b->current_data), (i32) (b->current_length));
s = format
(s,
"current_config_index/punt_reason: %d, flow_id: %x, next_buffer: %x\n",
b->current_config_index, b->flow_id, b->next_buffer);
s =
format (s, "error: %d, ref_count: %d, buffer_pool_index: %d\n",
(u32) (b->error), (u32) (b->ref_count),
(u32) (b->buffer_pool_index));
s =
format (s, "trace_handle: 0x%x, len_not_first_buf: %d\n", b->trace_handle,
b->total_length_not_including_first_buffer);
return s;
}
#define A(x) vec_add1(vm->pcap_buffer, (x))
static void
dispatch_pcap_trace (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
int i;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **bufp, *b;
pcap_main_t *pm = &vlib_global_main.dispatch_pcap_main;
vlib_trace_main_t *tm = &vm->trace_main;
u32 capture_size;
vlib_node_t *n;
i32 n_left;
f64 time_now = vlib_time_now (vm);
u32 *from;
u8 *d;
u8 string_count;
/* Input nodes don't have frames yet */
if (frame == 0 || frame->n_vectors == 0)
return;
from = vlib_frame_vector_args (frame);
vlib_get_buffers (vm, from, bufs, frame->n_vectors);
bufp = bufs;
n = vlib_get_node (vm, node->node_index);
for (i = 0; i < frame->n_vectors; i++)
{
if (PREDICT_TRUE (pm->n_packets_captured < pm->n_packets_to_capture))
{
b = bufp[i];
vec_reset_length (vm->pcap_buffer);
string_count = 0;
/* Version, flags */
A ((u8) VLIB_PCAP_MAJOR_VERSION);
A ((u8) VLIB_PCAP_MINOR_VERSION);
A (0 /* string_count */ );
A (n->protocol_hint);
/* Buffer index (big endian) */
A ((from[i] >> 24) & 0xff);
A ((from[i] >> 16) & 0xff);
A ((from[i] >> 8) & 0xff);
A ((from[i] >> 0) & 0xff);
/* Node name, NULL-terminated ASCII */
vm->pcap_buffer = format (vm->pcap_buffer, "%v%c", n->name, 0);
string_count++;
vm->pcap_buffer = format (vm->pcap_buffer, "%U%c",
format_buffer_metadata, b, 0);
string_count++;
vm->pcap_buffer = format (vm->pcap_buffer, "%U%c",
format_vnet_buffer_opaque, b, 0);
string_count++;
vm->pcap_buffer = format (vm->pcap_buffer, "%U%c",
format_vnet_buffer_opaque2, b, 0);
string_count++;
/* Is this packet traced? */
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
{
vlib_trace_header_t **h
= pool_elt_at_index (tm->trace_buffer_pool,
vlib_buffer_get_trace_index (b));
vm->pcap_buffer = format (vm->pcap_buffer, "%U%c",
format_vlib_trace, vm, h[0], 0);
string_count++;
}
/* Save the string count */
vm->pcap_buffer[2] = string_count;
/* Figure out how many bytes in the pcap trace */
capture_size = vec_len (vm->pcap_buffer) +
+vlib_buffer_length_in_chain (vm, b);
clib_spinlock_lock_if_init (&pm->lock);
n_left = clib_min (capture_size, 16384);
d = pcap_add_packet (pm, time_now, n_left, capture_size);
/* Copy the header */
clib_memcpy_fast (d, vm->pcap_buffer, vec_len (vm->pcap_buffer));
d += vec_len (vm->pcap_buffer);
n_left = clib_min
(vlib_buffer_length_in_chain (vm, b),
(16384 - vec_len (vm->pcap_buffer)));
/* Copy the packet data */
while (1)
{
u32 copy_length = clib_min ((u32) n_left, b->current_length);
clib_memcpy_fast (d, b->data + b->current_data, copy_length);
n_left -= b->current_length;
if (n_left <= 0)
break;
d += b->current_length;
ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
b = vlib_get_buffer (vm, b->next_buffer);
}
clib_spinlock_unlock_if_init (&pm->lock);
}
}
}
static_always_inline u64
dispatch_node (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_node_type_t type,
vlib_node_state_t dispatch_state,
vlib_frame_t * frame, u64 last_time_stamp)
{
uword n, v;
u64 t;
vlib_node_main_t *nm = &vm->node_main;
vlib_next_frame_t *nf;
if (CLIB_DEBUG > 0)
{
vlib_node_t *n = vlib_get_node (vm, node->node_index);
ASSERT (n->type == type);
}
/* Only non-internal nodes may be disabled. */
if (type != VLIB_NODE_TYPE_INTERNAL && node->state != dispatch_state)
{
ASSERT (type != VLIB_NODE_TYPE_INTERNAL);
return last_time_stamp;
}
if ((type == VLIB_NODE_TYPE_PRE_INPUT || type == VLIB_NODE_TYPE_INPUT)
&& dispatch_state != VLIB_NODE_STATE_INTERRUPT)
{
u32 c = node->input_main_loops_per_call;
/* Only call node when count reaches zero. */
if (c)
{
node->input_main_loops_per_call = c - 1;
return last_time_stamp;
}
}
/* Speculatively prefetch next frames. */
if (node->n_next_nodes > 0)
{
nf = vec_elt_at_index (nm->next_frames, node->next_frame_index);
CLIB_PREFETCH (nf, 4 * sizeof (nf[0]), WRITE);
}
vm->cpu_time_last_node_dispatch = last_time_stamp;
vlib_elog_main_loop_event (vm, node->node_index,
last_time_stamp, frame ? frame->n_vectors : 0,
/* is_after */ 0);
vlib_node_runtime_perf_counter (vm, node, frame, 0, last_time_stamp,
VLIB_NODE_RUNTIME_PERF_BEFORE);
/*
* Turn this on if you run into
* "bad monkey" contexts, and you want to know exactly
* which nodes they've visited... See ixge.c...
*/
if (VLIB_BUFFER_TRACE_TRAJECTORY && frame)
{
int i;
u32 *from;
from = vlib_frame_vector_args (frame);
for (i = 0; i < frame->n_vectors; i++)
{
vlib_buffer_t *b = vlib_get_buffer (vm, from[i]);
add_trajectory_trace (b, node->node_index);
}
if (PREDICT_FALSE (vm->dispatch_pcap_enable))
dispatch_pcap_trace (vm, node, frame);
n = node->function (vm, node, frame);
}
else
{
if (PREDICT_FALSE (vm->dispatch_pcap_enable))
dispatch_pcap_trace (vm, node, frame);
n = node->function (vm, node, frame);
}
t = clib_cpu_time_now ();
vlib_node_runtime_perf_counter (vm, node, frame, n, t,
VLIB_NODE_RUNTIME_PERF_AFTER);
vlib_elog_main_loop_event (vm, node->node_index, t, n, 1 /* is_after */ );
vm->main_loop_vectors_processed += n;
vm->main_loop_nodes_processed += n > 0;
v = vlib_node_runtime_update_stats (vm, node,
/* n_calls */ 1,
/* n_vectors */ n,
/* n_clocks */ t - last_time_stamp);
/* When in interrupt mode and vector rate crosses threshold switch to
polling mode. */
if (PREDICT_FALSE ((dispatch_state == VLIB_NODE_STATE_INTERRUPT)
|| (dispatch_state == VLIB_NODE_STATE_POLLING
&& (node->flags
&
VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE))))
{
/* *INDENT-OFF* */
ELOG_TYPE_DECLARE (e) =
{
.function = (char *) __FUNCTION__,
.format = "%s vector length %d, switching to %s",
.format_args = "T4i4t4",
.n_enum_strings = 2,
.enum_strings = {
"interrupt", "polling",
},
};
/* *INDENT-ON* */
struct
{
u32 node_name, vector_length, is_polling;
} *ed;
if ((dispatch_state == VLIB_NODE_STATE_INTERRUPT
&& v >= nm->polling_threshold_vector_length) &&
!(node->flags &
VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE))
{
vlib_node_t *n = vlib_get_node (vm, node->node_index);
n->state = VLIB_NODE_STATE_POLLING;
node->state = VLIB_NODE_STATE_POLLING;
node->flags &=
~VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE;
node->flags |= VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE;
nm->input_node_counts_by_state[VLIB_NODE_STATE_INTERRUPT] -= 1;
nm->input_node_counts_by_state[VLIB_NODE_STATE_POLLING] += 1;
if (PREDICT_FALSE (vlib_global_main.elog_trace_graph_dispatch))
{
vlib_worker_thread_t *w = vlib_worker_threads
+ vm->thread_index;
ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
w->elog_track);
ed->node_name = n->name_elog_string;
ed->vector_length = v;
ed->is_polling = 1;
}
}
else if (dispatch_state == VLIB_NODE_STATE_POLLING
&& v <= nm->interrupt_threshold_vector_length)
{
vlib_node_t *n = vlib_get_node (vm, node->node_index);
if (node->flags &
VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE)
{
/* Switch to interrupt mode after dispatch in polling one more time.
This allows driver to re-enable interrupts. */
n->state = VLIB_NODE_STATE_INTERRUPT;
node->state = VLIB_NODE_STATE_INTERRUPT;
node->flags &=
~VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE;
nm->input_node_counts_by_state[VLIB_NODE_STATE_POLLING] -= 1;
nm->input_node_counts_by_state[VLIB_NODE_STATE_INTERRUPT] += 1;
}
else
{
vlib_worker_thread_t *w = vlib_worker_threads
+ vm->thread_index;
node->flags |=
VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE;
if (PREDICT_FALSE (vlib_global_main.elog_trace_graph_dispatch))
{
ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
w->elog_track);
ed->node_name = n->name_elog_string;
ed->vector_length = v;
ed->is_polling = 0;
}
}
}
}
return t;
}
static u64
dispatch_pending_node (vlib_main_t * vm, uword pending_frame_index,
u64 last_time_stamp)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_frame_t *f;
vlib_next_frame_t *nf, nf_placeholder;
vlib_node_runtime_t *n;
vlib_frame_t *restore_frame;
vlib_pending_frame_t *p;
/* See comment below about dangling references to nm->pending_frames */
p = nm->pending_frames + pending_frame_index;
n = vec_elt_at_index (nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL],
p->node_runtime_index);
f = vlib_get_frame (vm, p->frame);
if (p->next_frame_index == VLIB_PENDING_FRAME_NO_NEXT_FRAME)
{
/* No next frame: so use placeholder on stack. */
nf = &nf_placeholder;
nf->flags = f->frame_flags & VLIB_NODE_FLAG_TRACE;
nf->frame = NULL;
}
else
nf = vec_elt_at_index (nm->next_frames, p->next_frame_index);
ASSERT (f->frame_flags & VLIB_FRAME_IS_ALLOCATED);
/* Force allocation of new frame while current frame is being
dispatched. */
restore_frame = NULL;
if (nf->frame == p->frame)
{
nf->frame = NULL;
nf->flags &= ~VLIB_FRAME_IS_ALLOCATED;
if (!(n->flags & VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH))
restore_frame = p->frame;
}
/* Frame must be pending. */
ASSERT (f->frame_flags & VLIB_FRAME_PENDING);
ASSERT (f->n_vectors > 0);
/* Copy trace flag from next frame to node.
Trace flag indicates that at least one vector in the dispatched
frame is traced. */
n->flags &= ~VLIB_NODE_FLAG_TRACE;
n->flags |= (nf->flags & VLIB_FRAME_TRACE) ? VLIB_NODE_FLAG_TRACE : 0;
nf->flags &= ~VLIB_FRAME_TRACE;
last_time_stamp = dispatch_node (vm, n,
VLIB_NODE_TYPE_INTERNAL,
VLIB_NODE_STATE_POLLING,
f, last_time_stamp);
/* Internal node vector-rate accounting, for summary stats */
vm->internal_node_vectors += f->n_vectors;
vm->internal_node_calls++;
vm->internal_node_last_vectors_per_main_loop =
(f->n_vectors > vm->internal_node_last_vectors_per_main_loop) ?
f->n_vectors : vm->internal_node_last_vectors_per_main_loop;
f->frame_flags &= ~(VLIB_FRAME_PENDING | VLIB_FRAME_NO_APPEND);
/* Frame is ready to be used again, so restore it. */
if (restore_frame != NULL)
{
/*
* We musn't restore a frame that is flagged to be freed. This
* shouldn't happen since frames to be freed post dispatch are
* those used when the to-node frame becomes full i.e. they form a
* sort of queue of frames to a single node. If we get here then
* the to-node frame and the pending frame *were* the same, and so
* we removed the to-node frame. Therefore this frame is no
* longer part of the queue for that node and hence it cannot be
* it's overspill.
*/
ASSERT (!(f->frame_flags & VLIB_FRAME_FREE_AFTER_DISPATCH));
/*
* NB: dispatching node n can result in the creation and scheduling
* of new frames, and hence in the reallocation of nm->pending_frames.
* Recompute p, or no supper. This was broken for more than 10 years.
*/
p = nm->pending_frames + pending_frame_index;
/*
* p->next_frame_index can change during node dispatch if node
* function decides to change graph hook up.
*/
nf = vec_elt_at_index (nm->next_frames, p->next_frame_index);
nf->flags |= VLIB_FRAME_IS_ALLOCATED;
if (NULL == nf->frame)
{
/* no new frame has been assigned to this node, use the saved one */
nf->frame = restore_frame;
f->n_vectors = 0;
}
else
{
/* The node has gained a frame, implying packets from the current frame
were re-queued to this same node. we don't need the saved one
anymore */
vlib_frame_free (vm, n, f);
}
}
else
{
if (f->frame_flags & VLIB_FRAME_FREE_AFTER_DISPATCH)
{
ASSERT (!(n->flags & VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH));
vlib_frame_free (vm, n, f);
}
}
return last_time_stamp;
}
always_inline uword
vlib_process_stack_is_valid (vlib_process_t * p)
{
return p->stack[0] == VLIB_PROCESS_STACK_MAGIC;
}
typedef struct
{
vlib_main_t *vm;
vlib_process_t *process;
vlib_frame_t *frame;
} vlib_process_bootstrap_args_t;
/* Called in process stack. */
static uword
vlib_process_bootstrap (uword _a)
{
vlib_process_bootstrap_args_t *a;
vlib_main_t *vm;
vlib_node_runtime_t *node;
vlib_frame_t *f;
vlib_process_t *p;
uword n;
a = uword_to_pointer (_a, vlib_process_bootstrap_args_t *);
vm = a->vm;
p = a->process;
vlib_process_finish_switch_stack (vm);
f = a->frame;
node = &p->node_runtime;
n = node->function (vm, node, f);
ASSERT (vlib_process_stack_is_valid (p));
vlib_process_start_switch_stack (vm, 0);
clib_longjmp (&p->return_longjmp, n);
return n;
}
/* Called in main stack. */
static_always_inline uword
vlib_process_startup (vlib_main_t * vm, vlib_process_t * p, vlib_frame_t * f)
{
vlib_process_bootstrap_args_t a;
uword r;
a.vm = vm;
a.process = p;
a.frame = f;
r = clib_setjmp (&p->return_longjmp, VLIB_PROCESS_RETURN_LONGJMP_RETURN);
if (r == VLIB_PROCESS_RETURN_LONGJMP_RETURN)
{
vlib_process_start_switch_stack (vm, p);
r = clib_calljmp (vlib_process_bootstrap, pointer_to_uword (&a),
(void *) p->stack + (1 << p->log2_n_stack_bytes));
}
else
vlib_process_finish_switch_stack (vm);
return r;
}
static_always_inline uword
vlib_process_resume (vlib_main_t * vm, vlib_process_t * p)
{
uword r;
p->flags &= ~(VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_CLOCK
| VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_EVENT
| VLIB_PROCESS_RESUME_PENDING);
r = clib_setjmp (&p->return_longjmp, VLIB_PROCESS_RETURN_LONGJMP_RETURN);
if (r == VLIB_PROCESS_RETURN_LONGJMP_RETURN)
{
vlib_process_start_switch_stack (vm, p);
clib_longjmp (&p->resume_longjmp, VLIB_PROCESS_RESUME_LONGJMP_RESUME);
}
else
vlib_process_finish_switch_stack (vm);
return r;
}
static u64
dispatch_process (vlib_main_t * vm,
vlib_process_t * p, vlib_frame_t * f, u64 last_time_stamp)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_node_runtime_t *node_runtime = &p->node_runtime;
vlib_node_t *node = vlib_get_node (vm, node_runtime->node_index);
u32 old_process_index;
u64 t;
uword n_vectors, is_suspend;
if (node->state != VLIB_NODE_STATE_POLLING
|| (p->flags & (VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_CLOCK
| VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_EVENT)))
return last_time_stamp;
p->flags |= VLIB_PROCESS_IS_RUNNING;
t = last_time_stamp;
vlib_elog_main_loop_event (vm, node_runtime->node_index, t,
f ? f->n_vectors : 0, /* is_after */ 0);
/* Save away current process for suspend. */
old_process_index = nm->current_process_index;
nm->current_process_index = node->runtime_index;
vlib_node_runtime_perf_counter (vm, node_runtime, f, 0, last_time_stamp,
VLIB_NODE_RUNTIME_PERF_BEFORE);
n_vectors = vlib_process_startup (vm, p, f);
nm->current_process_index = old_process_index;
ASSERT (n_vectors != VLIB_PROCESS_RETURN_LONGJMP_RETURN);
is_suspend = n_vectors == VLIB_PROCESS_RETURN_LONGJMP_SUSPEND;
if (is_suspend)
{
vlib_pending_frame_t *pf;
n_vectors = 0;
pool_get (nm->suspended_process_frames, pf);
pf->node_runtime_index = node->runtime_index;
pf->frame = f;
pf->next_frame_index = ~0;
p->n_suspends += 1;
p->suspended_process_frame_index = pf - nm->suspended_process_frames;
if (p->flags & VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_CLOCK)
{
TWT (tw_timer_wheel) * tw =
(TWT (tw_timer_wheel) *) nm->timing_wheel;
p->stop_timer_handle =
TW (tw_timer_start) (tw,
vlib_timing_wheel_data_set_suspended_process
(node->runtime_index) /* [sic] pool idex */ ,
0 /* timer_id */ ,
p->resume_clock_interval);
}
}
else
p->flags &= ~VLIB_PROCESS_IS_RUNNING;
t = clib_cpu_time_now ();
vlib_elog_main_loop_event (vm, node_runtime->node_index, t, is_suspend,
/* is_after */ 1);
vlib_node_runtime_perf_counter (vm, node_runtime, f, n_vectors, t,
VLIB_NODE_RUNTIME_PERF_AFTER);
vlib_process_update_stats (vm, p,
/* n_calls */ !is_suspend,
/* n_vectors */ n_vectors,
/* n_clocks */ t - last_time_stamp);
return t;
}
void
vlib_start_process (vlib_main_t * vm, uword process_index)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_process_t *p = vec_elt (nm->processes, process_index);
dispatch_process (vm, p, /* frame */ 0, /* cpu_time_now */ 0);
}
static u64
dispatch_suspended_process (vlib_main_t * vm,
uword process_index, u64 last_time_stamp)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_node_runtime_t *node_runtime;
vlib_node_t *node;
vlib_frame_t *f;
vlib_process_t *p;
vlib_pending_frame_t *pf;
u64 t, n_vectors, is_suspend;
t = last_time_stamp;
p = vec_elt (nm->processes, process_index);
if (PREDICT_FALSE (!(p->flags & VLIB_PROCESS_IS_RUNNING)))
return last_time_stamp;
ASSERT (p->flags & (VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_CLOCK
| VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_EVENT));
pf = pool_elt_at_index (nm->suspended_process_frames,
p->suspended_process_frame_index);
node_runtime = &p->node_runtime;
node = vlib_get_node (vm, node_runtime->node_index);
f = pf->frame;
vlib_elog_main_loop_event (vm, node_runtime->node_index, t,
f ? f->n_vectors : 0, /* is_after */ 0);
/* Save away current process for suspend. */
nm->current_process_index = node->runtime_index;
vlib_node_runtime_perf_counter (vm, node_runtime, f, 0, last_time_stamp,
VLIB_NODE_RUNTIME_PERF_BEFORE);
n_vectors = vlib_process_resume (vm, p);
t = clib_cpu_time_now ();
nm->current_process_index = ~0;
is_suspend = n_vectors == VLIB_PROCESS_RETURN_LONGJMP_SUSPEND;
if (is_suspend)
{
/* Suspend it again. */
n_vectors = 0;
p->n_suspends += 1;
if (p->flags & VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_CLOCK)
{
p->stop_timer_handle =
TW (tw_timer_start) ((TWT (tw_timer_wheel) *) nm->timing_wheel,
vlib_timing_wheel_data_set_suspended_process
(node->runtime_index) /* [sic] pool idex */ ,
0 /* timer_id */ ,
p->resume_clock_interval);
}
}
else
{
p->flags &= ~VLIB_PROCESS_IS_RUNNING;
pool_put_index (nm->suspended_process_frames,
p->suspended_process_frame_index);
p->suspended_process_frame_index = ~0;
}
t = clib_cpu_time_now ();
vlib_elog_main_loop_event (vm, node_runtime->node_index, t, !is_suspend,
/* is_after */ 1);
vlib_node_runtime_perf_counter (vm, node_runtime, f, n_vectors, t,
VLIB_NODE_RUNTIME_PERF_AFTER);
vlib_process_update_stats (vm, p,
/* n_calls */ !is_suspend,
/* n_vectors */ n_vectors,
/* n_clocks */ t - last_time_stamp);
return t;
}
void vl_api_send_pending_rpc_requests (vlib_main_t *) __attribute__ ((weak));
void
vl_api_send_pending_rpc_requests (vlib_main_t * vm)
{
}
static_always_inline u64
dispatch_pending_interrupts (vlib_main_t * vm, vlib_node_main_t * nm,
u64 cpu_time_now)
{
vlib_node_runtime_t *n;
for (int i = 0; i < _vec_len (nm->pending_local_interrupts); i++)
{
vlib_node_interrupt_t *in;
in = vec_elt_at_index (nm->pending_local_interrupts, i);
n = vec_elt_at_index (nm->nodes_by_type[VLIB_NODE_TYPE_INPUT],
in->node_runtime_index);
n->interrupt_data = in->data;
cpu_time_now = dispatch_node (vm, n, VLIB_NODE_TYPE_INPUT,
VLIB_NODE_STATE_INTERRUPT, /* frame */ 0,
cpu_time_now);
}
vec_reset_length (nm->pending_local_interrupts);
return cpu_time_now;
}
static_always_inline void
vlib_main_or_worker_loop (vlib_main_t * vm, int is_main)
{
vlib_node_main_t *nm = &vm->node_main;
vlib_thread_main_t *tm = vlib_get_thread_main ();
uword i;
u64 cpu_time_now;
f64 now;
vlib_frame_queue_main_t *fqm;
u32 frame_queue_check_counter = 0;
/* Initialize pending node vector. */
if (is_main)
{
vec_resize (nm->pending_frames, 32);
_vec_len (nm->pending_frames) = 0;
}
/* Mark time of main loop start. */
if (is_main)
{
cpu_time_now = vm->clib_time.last_cpu_time;
vm->cpu_time_main_loop_start = cpu_time_now;
}
else
cpu_time_now = clib_cpu_time_now ();
/* Pre-allocate interupt runtime indices and lock. */
vec_alloc (nm->pending_local_interrupts, 32);
vec_alloc (nm->pending_remote_interrupts, 32);
vec_alloc_aligned (nm->pending_remote_interrupts_notify, 1,
CLIB_CACHE_LINE_BYTES);
clib_spinlock_init (&nm->pending_interrupt_lock);
/* Pre-allocate expired nodes. */
if (!nm->polling_threshold_vector_length)
nm->polling_threshold_vector_length = 10;
if (!nm->interrupt_threshold_vector_length)
nm->interrupt_threshold_vector_length = 5;
vm->cpu_id = clib_get_current_cpu_id ();
vm->numa_node = clib_get_current_numa_node ();
os_set_numa_index (vm->numa_node);
/* Start all processes. */
if (is_main)
{
uword i;
/*
* Perform an initial barrier sync. Pays no attention to
* the barrier sync hold-down timer scheme, which won't work
* at this point in time.
*/
vlib_worker_thread_initial_barrier_sync_and_release (vm);
nm->current_process_index = ~0;
for (i = 0; i < vec_len (nm->processes); i++)
cpu_time_now = dispatch_process (vm, nm->processes[i], /* frame */ 0,
cpu_time_now);
}
while (1)
{
vlib_node_runtime_t *n;
if (PREDICT_FALSE (_vec_len (vm->pending_rpc_requests) > 0))
{
if (!is_main)
vl_api_send_pending_rpc_requests (vm);
}
if (!is_main)
vlib_worker_thread_barrier_check ();
if (PREDICT_FALSE (vm->check_frame_queues + frame_queue_check_counter))
{
u32 processed = 0;
if (vm->check_frame_queues)
{
frame_queue_check_counter = 100;
vm->check_frame_queues = 0;
}
vec_foreach (fqm, tm->frame_queue_mains)
processed += vlib_frame_queue_dequeue (vm, fqm);
/* No handoff queue work found? */
if (processed)
frame_queue_check_counter = 100;
else
frame_queue_check_counter--;
}
if (PREDICT_FALSE (vec_len (vm->worker_thread_main_loop_callbacks)))
clib_call_callbacks (vm->worker_thread_main_loop_callbacks, vm,
cpu_time_now);
/* Process pre-input nodes. */
cpu_time_now = clib_cpu_time_now ();
vec_foreach (n, nm->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT])
cpu_time_now = dispatch_node (vm, n,
VLIB_NODE_TYPE_PRE_INPUT,
VLIB_NODE_STATE_POLLING,
/* frame */ 0,
cpu_time_now);
/* Next process input nodes. */
vec_foreach (n, nm->nodes_by_type[VLIB_NODE_TYPE_INPUT])
cpu_time_now = dispatch_node (vm, n,
VLIB_NODE_TYPE_INPUT,
VLIB_NODE_STATE_POLLING,
/* frame */ 0,
cpu_time_now);
if (PREDICT_TRUE (is_main && vm->queue_signal_pending == 0))
vm->queue_signal_callback (vm);
/* handle local interruots */
if (_vec_len (nm->pending_local_interrupts))
cpu_time_now = dispatch_pending_interrupts (vm, nm, cpu_time_now);
/* handle remote interruots */
if (PREDICT_FALSE (_vec_len (nm->pending_remote_interrupts)))
{
vlib_node_interrupt_t *in;
/* at this point it is known that
* vec_len (nm->pending_local_interrupts) is zero so we quickly swap
* local and remote vector under the spinlock */
clib_spinlock_lock (&nm->pending_interrupt_lock);
in = nm->pending_local_interrupts;
nm->pending_local_interrupts = nm->pending_remote_interrupts;
nm->pending_remote_interrupts = in;
*nm->pending_remote_interrupts_notify = 0;
clib_spinlock_unlock (&nm->pending_interrupt_lock);
cpu_time_now = dispatch_pending_interrupts (vm, nm, cpu_time_now);
}
/* Input nodes may have added work to the pending vector.
Process pending vector until there is nothing left.
All pending vectors will be processed from input -> output. */
for (i = 0; i < _vec_len (nm->pending_frames); i++)
cpu_time_now = dispatch_pending_node (vm, i, cpu_time_now);
/* Reset pending vector for next iteration. */
_vec_len (nm->pending_frames) = 0;
if (is_main)
{
/* *INDENT-OFF* */
ELOG_TYPE_DECLARE (es) =
{
.format = "process tw start",
.format_args = "",
};
ELOG_TYPE_DECLARE (ee) =
{
.format = "process tw end: %d",
.format_args = "i4",
};
/* *INDENT-ON* */
struct
{
int nready_procs;
} *ed;
/* Check if process nodes have expired from timing wheel. */
ASSERT (nm->data_from_advancing_timing_wheel != 0);
if (PREDICT_FALSE (vm->elog_trace_graph_dispatch))
ed = ELOG_DATA (&vlib_global_main.elog_main, es);
nm->data_from_advancing_timing_wheel =
TW (tw_timer_expire_timers_vec)
((TWT (tw_timer_wheel) *) nm->timing_wheel, vlib_time_now (vm),
nm->data_from_advancing_timing_wheel);
ASSERT (nm->data_from_advancing_timing_wheel != 0);
if (PREDICT_FALSE (vm->elog_trace_graph_dispatch))
{
ed = ELOG_DATA (&vlib_global_main.elog_main, ee);
ed->nready_procs =
_vec_len (nm->data_from_advancing_timing_wheel);
}
if (PREDICT_FALSE
(_vec_len (nm->data_from_advancing_timing_wheel) > 0))
{
uword i;
for (i = 0; i < _vec_len (nm->data_from_advancing_timing_wheel);
i++)
{
u32 d = nm->data_from_advancing_timing_wheel[i];
u32 di = vlib_timing_wheel_data_get_index (d);
if (vlib_timing_wheel_data_is_timed_event (d))
{
vlib_signal_timed_event_data_t *te =
pool_elt_at_index (nm->signal_timed_event_data_pool,
di);
vlib_node_t *n =
vlib_get_node (vm, te->process_node_index);
vlib_process_t *p =
vec_elt (nm->processes, n->runtime_index);
void *data;
data =
vlib_process_signal_event_helper (nm, n, p,
te->event_type_index,
te->n_data_elts,
te->n_data_elt_bytes);
if (te->n_data_bytes < sizeof (te->inline_event_data))
clib_memcpy_fast (data, te->inline_event_data,
te->n_data_bytes);
else
{
clib_memcpy_fast (data, te->event_data_as_vector,
te->n_data_bytes);
vec_free (te->event_data_as_vector);
}
pool_put (nm->signal_timed_event_data_pool, te);
}
else
{
cpu_time_now = clib_cpu_time_now ();
cpu_time_now =
dispatch_suspended_process (vm, di, cpu_time_now);
}
}
_vec_len (nm->data_from_advancing_timing_wheel) = 0;
}
}
vlib_increment_main_loop_counter (vm);
/* Record time stamp in case there are no enabled nodes and above
calls do not update time stamp. */
cpu_time_now = clib_cpu_time_now ();
vm->loops_this_reporting_interval++;
now = clib_time_now_internal (&vm->clib_time, cpu_time_now);
/* Time to update loops_per_second? */
if (PREDICT_FALSE (now >= vm->loop_interval_end))
{
/* Next sample ends in 20ms */
if (vm->loop_interval_start)
{
f64 this_loops_per_second;
this_loops_per_second =
((f64) vm->loops_this_reporting_interval) / (now -
vm->loop_interval_start);
vm->loops_per_second =
vm->loops_per_second * vm->damping_constant +
(1.0 - vm->damping_constant) * this_loops_per_second;
if (vm->loops_per_second != 0.0)
vm->seconds_per_loop = 1.0 / vm->loops_per_second;
else
vm->seconds_per_loop = 0.0;
}
/* New interval starts now, and ends in 20ms */
vm->loop_interval_start = now;
vm->loop_interval_end = now + 2e-4;
vm->loops_this_reporting_interval = 0;
}
}
}
static void
vlib_main_loop (vlib_main_t * vm)
{
vlib_main_or_worker_loop (vm, /* is_main */ 1);
}
void
vlib_worker_loop (vlib_main_t * vm)
{
vlib_main_or_worker_loop (vm, /* is_main */ 0);
}
vlib_main_t vlib_global_main;
static clib_error_t *
vlib_main_configure (vlib_main_t * vm, unformat_input_t * input)
{
int turn_on_mem_trace = 0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "memory-trace"))
turn_on_mem_trace = 1;
else if (unformat (input, "elog-events %d",
&vm->elog_main.event_ring_size))
;
else if (unformat (input, "elog-post-mortem-dump"))
vm->elog_post_mortem_dump = 1;
else if (unformat (input, "buffer-alloc-success-rate %f",
&vm->buffer_alloc_success_rate))
{
if (VLIB_BUFFER_ALLOC_FAULT_INJECTOR == 0)
return clib_error_return
(0, "Buffer fault injection not configured");
}
else if (unformat (input, "buffer-alloc-success-seed %u",
&vm->buffer_alloc_success_seed))
{
if (VLIB_BUFFER_ALLOC_FAULT_INJECTOR == 0)
return clib_error_return
(0, "Buffer fault injection not configured");
}
else
return unformat_parse_error (input);
}
unformat_free (input);
/* Enable memory trace as early as possible. */
if (turn_on_mem_trace)
clib_mem_trace (1);
return 0;
}
VLIB_EARLY_CONFIG_FUNCTION (vlib_main_configure, "vlib");
static void
placeholder_queue_signal_callback (vlib_main_t * vm)
{
}
#define foreach_weak_reference_stub \
_(vlib_map_stat_segment_init) \
_(vpe_api_init) \
_(vlibmemory_init) \
_(map_api_segment_init)
#define _(name) \
clib_error_t *name (vlib_main_t *vm) __attribute__((weak)); \
clib_error_t *name (vlib_main_t *vm) { return 0; }
foreach_weak_reference_stub;
#undef _
void vl_api_set_elog_main (elog_main_t * m) __attribute__ ((weak));
void
vl_api_set_elog_main (elog_main_t * m)
{
clib_warning ("STUB");
}
int vl_api_set_elog_trace_api_messages (int enable) __attribute__ ((weak));
int
vl_api_set_elog_trace_api_messages (int enable)
{
clib_warning ("STUB");
return 0;
}
int vl_api_get_elog_trace_api_messages (void) __attribute__ ((weak));
int
vl_api_get_elog_trace_api_messages (void)
{
clib_warning ("STUB");
return 0;
}
/* Main function. */
int
vlib_main (vlib_main_t * volatile vm, unformat_input_t * input)
{
clib_error_t *volatile error;
vlib_node_main_t *nm = &vm->node_main;
vm->queue_signal_callback = placeholder_queue_signal_callback;
/* Turn on event log. */
if (!vm->elog_main.event_ring_size)
vm->elog_main.event_ring_size = 128 << 10;
elog_init (&vm->elog_main, vm->elog_main.event_ring_size);
elog_enable_disable (&vm->elog_main, 1);
vl_api_set_elog_main (&vm->elog_main);
(void) vl_api_set_elog_trace_api_messages (1);
/* Default name. */
if (!vm->name)
vm->name = "VLIB";
if ((error = vlib_physmem_init (vm)))
{
clib_error_report (error);
goto done;
}
if ((error = vlib_map_stat_segment_init (vm)))
{
clib_error_report (error);
goto done;
}
if ((error = vlib_buffer_main_init (vm)))
{
clib_error_report (error);
goto done;
}
if ((error = vlib_thread_init (vm)))
{
clib_error_report (error);
goto done;
}
/* Register static nodes so that init functions may use them. */
vlib_register_all_static_nodes (vm);
/* Set seed for random number generator.
Allow user to specify seed to make random sequence deterministic. */
if (!unformat (input, "seed %wd", &vm->random_seed))
vm->random_seed = clib_cpu_time_now ();
clib_random_buffer_init (&vm->random_buffer, vm->random_seed);
/* Initialize node graph. */
if ((error = vlib_node_main_init (vm)))
{
/* Arrange for graph hook up error to not be fatal when debugging. */
if (CLIB_DEBUG > 0)
clib_error_report (error);
else
goto done;
}
/* Direct call / weak reference, for vlib standalone use-cases */
if ((error = vpe_api_init (vm)))
{
clib_error_report (error);
goto done;
}
if ((error = vlibmemory_init (vm)))
{
clib_error_report (error);
goto done;
}
if ((error = map_api_segment_init (vm)))
{
clib_error_report (error);
goto done;
}
/* See unix/main.c; most likely already set up */
if (vm->init_functions_called == 0)
vm->init_functions_called = hash_create (0, /* value bytes */ 0);
if ((error = vlib_call_all_init_functions (vm)))
goto done;
nm->timing_wheel = clib_mem_alloc_aligned (sizeof (TWT (tw_timer_wheel)),
CLIB_CACHE_LINE_BYTES);
vec_validate (nm->data_from_advancing_timing_wheel, 10);
_vec_len (nm->data_from_advancing_timing_wheel) = 0;
/* Create the process timing wheel */
TW (tw_timer_wheel_init) ((TWT (tw_timer_wheel) *) nm->timing_wheel,
0 /* no callback */ ,
10e-6 /* timer period 10us */ ,
~0 /* max expirations per call */ );
vec_validate (vm->pending_rpc_requests, 0);
_vec_len (vm->pending_rpc_requests) = 0;
vec_validate (vm->processing_rpc_requests, 0);
_vec_len (vm->processing_rpc_requests) = 0;
/* Default params for the buffer allocator fault injector, if configured */
if (VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0)
{
vm->buffer_alloc_success_seed = 0xdeaddabe;
vm->buffer_alloc_success_rate = 0.80;
}
if ((error = vlib_call_all_config_functions (vm, input, 0 /* is_early */ )))
goto done;
/*
* Use exponential smoothing, with a half-life of 1 second
* reported_rate(t) = reported_rate(t-1) * K + rate(t)*(1-K)
*
* Sample every 20ms, aka 50 samples per second
* K = exp (-1.0/20.0);
* K = 0.95
*/
vm->damping_constant = exp (-1.0 / 20.0);
/* Sort per-thread init functions before we start threads */
vlib_sort_init_exit_functions (&vm->worker_init_function_registrations);
/* Call all main loop enter functions. */
{
clib_error_t *sub_error;
sub_error = vlib_call_all_main_loop_enter_functions (vm);
if (sub_error)
clib_error_report (sub_error);
}
switch (clib_setjmp (&vm->main_loop_exit, VLIB_MAIN_LOOP_EXIT_NONE))
{
case VLIB_MAIN_LOOP_EXIT_NONE:
vm->main_loop_exit_set = 1;
break;
case VLIB_MAIN_LOOP_EXIT_CLI:
goto done;
default:
error = vm->main_loop_error;
goto done;
}
vlib_main_loop (vm);
done:
/* Call all exit functions. */
{
clib_error_t *sub_error;
sub_error = vlib_call_all_main_loop_exit_functions (vm);
if (sub_error)
clib_error_report (sub_error);
}
if (error)
clib_error_report (error);
return 0;
}
int
vlib_pcap_dispatch_trace_configure (vlib_pcap_dispatch_trace_args_t * a)
{
vlib_main_t *vm = vlib_get_main ();
pcap_main_t *pm = &vm->dispatch_pcap_main;
vlib_trace_main_t *tm;
vlib_trace_node_t *tn;
if (a->status)
{
if (vm->dispatch_pcap_enable)
{
int i;
vlib_cli_output
(vm, "pcap dispatch capture enabled: %d of %d pkts...",
pm->n_packets_captured, pm->n_packets_to_capture);
vlib_cli_output (vm, "capture to file %s", pm->file_name);
for (i = 0; i < vec_len (vm->dispatch_buffer_trace_nodes); i++)
{
vlib_cli_output (vm,
"Buffer trace of %d pkts from %U enabled...",
a->buffer_traces_to_capture,
format_vlib_node_name, vm,
vm->dispatch_buffer_trace_nodes[i]);
}
}
else
vlib_cli_output (vm, "pcap dispatch capture disabled");
return 0;
}
/* Consistency checks */
/* Enable w/ capture already enabled not allowed */
if (vm->dispatch_pcap_enable && a->enable)
return -7; /* VNET_API_ERROR_INVALID_VALUE */
/* Disable capture with capture already disabled, not interesting */
if (vm->dispatch_pcap_enable == 0 && a->enable == 0)
return -81; /* VNET_API_ERROR_VALUE_EXIST */
/* Change number of packets to capture while capturing */
if (vm->dispatch_pcap_enable && a->enable
&& (pm->n_packets_to_capture != a->packets_to_capture))
return -8; /* VNET_API_ERROR_INVALID_VALUE_2 */
/* Independent of enable/disable, to allow buffer trace multi nodes */
if (a->buffer_trace_node_index != ~0)
{
/* *INDENT-OFF* */
foreach_vlib_main ((
{
tm = &this_vlib_main->trace_main;
tm->verbose = 0; /* not sure this ever did anything... */
vec_validate (tm->nodes, a->buffer_trace_node_index);
tn = tm->nodes + a->buffer_trace_node_index;
tn->limit += a->buffer_traces_to_capture;
tm->trace_enable = 1;
}));
/* *INDENT-ON* */
vec_add1 (vm->dispatch_buffer_trace_nodes, a->buffer_trace_node_index);
}
if (a->enable)
{
/* Clean up from previous run, if any */
vec_free (pm->file_name);
vec_free (pm->pcap_data);
memset (pm, 0, sizeof (*pm));
vec_validate_aligned (vnet_trace_placeholder, 2048,
CLIB_CACHE_LINE_BYTES);
if (pm->lock == 0)
clib_spinlock_init (&(pm->lock));
if (a->filename == 0)
a->filename = format (0, "/tmp/dispatch.pcap%c", 0);
pm->file_name = (char *) a->filename;
pm->n_packets_captured = 0;
pm->packet_type = PCAP_PACKET_TYPE_vpp;
pm->n_packets_to_capture = a->packets_to_capture;
/* *INDENT-OFF* */
foreach_vlib_main (({this_vlib_main->dispatch_pcap_enable = 1;}));
/* *INDENT-ON* */
}
else
{
/* *INDENT-OFF* */
foreach_vlib_main (({this_vlib_main->dispatch_pcap_enable = 0;}));
/* *INDENT-ON* */
vec_reset_length (vm->dispatch_buffer_trace_nodes);
if (pm->n_packets_captured)
{
clib_error_t *error;
pm->n_packets_to_capture = pm->n_packets_captured;
vlib_cli_output (vm, "Write %d packets to %s, and stop capture...",
pm->n_packets_captured, pm->file_name);
error = pcap_write (pm);
if (pm->flags & PCAP_MAIN_INIT_DONE)
pcap_close (pm);
/* Report I/O errors... */
if (error)
{
clib_error_report (error);
return -11; /* VNET_API_ERROR_SYSCALL_ERROR_1 */
}
return 0;
}
else
return -6; /* VNET_API_ERROR_NO_SUCH_ENTRY */
}
return 0;
}
static clib_error_t *
dispatch_trace_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
vlib_pcap_dispatch_trace_args_t _a, *a = &_a;
u8 *filename = 0;
u32 max = 1000;
int rv;
int enable = 0;
int status = 0;
u32 node_index = ~0, buffer_traces_to_capture = 100;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "on %=", &enable, 1))
;
else if (unformat (line_input, "enable %=", &enable, 1))
;
else if (unformat (line_input, "off %=", &enable, 0))
;
else if (unformat (line_input, "disable %=", &enable, 0))
;
else if (unformat (line_input, "max %d", &max))
;
else if (unformat (line_input, "packets-to-capture %d", &max))
;
else if (unformat (line_input, "file %U", unformat_vlib_tmpfile,
&filename))
;
else if (unformat (line_input, "status %=", &status, 1))
;
else if (unformat (line_input, "buffer-trace %U %d",
unformat_vlib_node, vm, &node_index,
&buffer_traces_to_capture))
;
else
{
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, line_input);
}
}
unformat_free (line_input);
/* no need for memset (a, 0, sizeof (*a)), set all fields here. */
a->filename = filename;
a->enable = enable;
a->status = status;
a->packets_to_capture = max;
a->buffer_trace_node_index = node_index;
a->buffer_traces_to_capture = buffer_traces_to_capture;
rv = vlib_pcap_dispatch_trace_configure (a);
switch (rv)
{
case 0:
break;
case -7:
return clib_error_return (0, "dispatch trace already enabled...");
case -81:
return clib_error_return (0, "dispatch trace already disabled...");
case -8:
return clib_error_return
(0, "can't change number of records to capture while tracing...");
case -11:
return clib_error_return (0, "I/O writing trace capture...");
case -6:
return clib_error_return (0, "No packets captured...");
default:
vlib_cli_output (vm, "WARNING: trace configure returned %d", rv);
break;
}
return 0;
}
/*?
* This command is used to start or stop pcap dispatch trace capture, or show
* the capture status.
*
* This command has the following optional parameters:
*
* - <b>on|off</b> - Used to start or stop capture.
*
* - <b>max <nn></b> - Depth of local buffer. Once '<em>nn</em>' number
* of packets have been received, buffer is flushed to file. Once another
* '<em>nn</em>' number of packets have been received, buffer is flushed
* to file, overwriting previous write. If not entered, value defaults
* to 100. Can only be updated if packet capture is off.
*
* - <b>file <name></b> - Used to specify the output filename. The file will
* be placed in the '<em>/tmp</em>' directory, so only the filename is
* supported. Directory should not be entered. If file already exists, file
* will be overwritten. If no filename is provided, '<em>/tmp/vpe.pcap</em>'
* will be used. Can only be updated if packet capture is off.
*
* - <b>status</b> - Displays the current status and configured attributes
* associated with a packet capture. If packet capture is in progress,
* '<em>status</em>' also will return the number of packets currently in
* the local buffer. All additional attributes entered on command line
* with '<em>status</em>' will be ignored and not applied.
*
* @cliexpar
* Example of how to display the status of capture when off:
* @cliexstart{pcap dispatch trace status}
* max is 100, for any interface to file /tmp/vpe.pcap
* pcap dispatch capture is off...
* @cliexend
* Example of how to start a dispatch trace capture:
* @cliexstart{pcap dispatch trace on max 35 file dispatchTrace.pcap}
* pcap dispatch capture on...
* @cliexend
* Example of how to start a dispatch trace capture with buffer tracing
* @cliexstart{pcap dispatch trace on max 10000 file dispatchTrace.pcap buffer-trace dpdk-input 1000}
* pcap dispatch capture on...
* @cliexend
* Example of how to display the status of a tx packet capture in progress:
* @cliexstart{pcap tx trace status}
* max is 35, dispatch trace to file /tmp/vppTest.pcap
* pcap tx capture is on: 20 of 35 pkts...
* @cliexend
* Example of how to stop a tx packet capture:
* @cliexstart{vppctl pcap dispatch trace off}
* captured 21 pkts...
* saved to /tmp/dispatchTrace.pcap...
* @cliexend
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (pcap_dispatch_trace_command, static) = {
.path = "pcap dispatch trace",
.short_help =
"pcap dispatch trace [on|off] [max <nn>] [file <name>] [status]\n"
" [buffer-trace <input-node-name> <nn>]",
.function = dispatch_trace_command_fn,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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