#include <vppinfra/linux/sysfs.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
+#include <vlib/stats/stats.h>
#define VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA 16384
#define VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV 8192
}
u8 *
-format_vlib_buffer (u8 * s, va_list * args)
+format_vlib_buffer_no_chain (u8 * s, va_list * args)
{
vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
u32 indent = format_get_indent (s);
"ref-count %u", b->current_data, b->current_length,
b->buffer_pool_index, b->ref_count);
- if (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)
+ if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
s = format (s, ", totlen-nifb %d",
b->total_length_not_including_first_buffer);
if (b->flags & VLIB_BUFFER_IS_TRACED)
- s = format (s, ", trace 0x%x", b->trace_index);
+ s = format (s, ", trace handle 0x%x", b->trace_handle);
if (a)
s = format (s, "\n%U%v", format_white_space, indent, a);
vec_free (a);
+ return s;
+}
+
+u8 *
+format_vlib_buffer (u8 * s, va_list * args)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *);
+ u32 indent = format_get_indent (s);
+
+ s = format (s, "%U", format_vlib_buffer_no_chain, b);
+
while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
- vlib_main_t *vm = vlib_get_main ();
u32 next_buffer = b->next_buffer;
b = vlib_get_buffer (vm, next_buffer);
if ((signed) b->current_data < (signed) -VLIB_BUFFER_PRE_DATA_SIZE)
return format (0, "current data %d before pre-data", b->current_data);
- if (b->current_data + b->current_length > VLIB_BUFFER_DATA_SIZE)
+ if (b->current_data + b->current_length >
+ vlib_buffer_get_default_data_size (vm))
return format (0, "%d-%d beyond end of buffer %d", b->current_data,
- b->current_length, VLIB_BUFFER_DATA_SIZE);
+ b->current_length, vlib_buffer_get_default_data_size (vm));
if (follow_buffer_next && (b->flags & VLIB_BUFFER_NEXT_PRESENT))
{
return result;
}
-/*
- * Hand-craft a static vector w/ length 1, so vec_len(vlib_mains) =1
- * and vlib_mains[0] = &vlib_global_main from the beginning of time.
- *
- * The only place which should ever expand vlib_mains is start_workers()
- * in threads.c. It knows about the bootstrap vector.
- */
-/* *INDENT-OFF* */
-static struct
-{
- vec_header_t h;
- vlib_main_t *vm;
-} __attribute__ ((packed)) __bootstrap_vlib_main_vector
- __attribute__ ((aligned (CLIB_CACHE_LINE_BYTES))) =
-{
- .h.len = 1,
- .vm = &vlib_global_main,
-};
-/* *INDENT-ON* */
-
-vlib_main_t **vlib_mains = &__bootstrap_vlib_main_vector.vm;
-
-
-/* When dubugging validate that given buffers are either known allocated
+/* When debugging validate that given buffers are either known allocated
or known free. */
void
vlib_buffer_validate_alloc_free (vlib_main_t * vm,
d = data;
n_left = n_data_bytes;
- n_buffer_bytes = VLIB_BUFFER_DATA_SIZE;
+ n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
b = vlib_get_buffer (vm, bi);
b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
u16 data_len)
{
vlib_buffer_t *l = *last;
- u32 n_buffer_bytes = VLIB_BUFFER_DATA_SIZE;
+ u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
u16 copied = 0;
ASSERT (n_buffer_bytes >= l->current_length + l->current_data);
while (data_len)
return copied;
}
-clib_error_t *
-vlib_buffer_pool_create (vlib_main_t * vm, u8 index, char *name,
- u32 data_size, u32 physmem_map_index)
+static uword
+vlib_buffer_alloc_size (uword ext_hdr_size, uword data_size)
+{
+ uword alloc_size = ext_hdr_size + sizeof (vlib_buffer_t) + data_size;
+ alloc_size = CLIB_CACHE_LINE_ROUND (alloc_size);
+
+ /* in case when we have even number of cachelines, we add one more for
+ * better cache occupancy */
+ alloc_size |= CLIB_CACHE_LINE_BYTES;
+
+ return alloc_size;
+}
+
+u8
+vlib_buffer_pool_create (vlib_main_t *vm, u32 data_size, u32 physmem_map_index,
+ char *fmt, ...)
{
vlib_buffer_main_t *bm = vm->buffer_main;
vlib_buffer_pool_t *bp;
vlib_physmem_map_t *m = vlib_physmem_get_map (vm, physmem_map_index);
uword start = pointer_to_uword (m->base);
uword size = (uword) m->n_pages << m->log2_page_size;
- uword i, j;
- u32 alloc_size, n_alloc_per_page;;
-
- vec_validate_aligned (bm->buffer_pools, index, CLIB_CACHE_LINE_BYTES);
- bp = vec_elt_at_index (bm->buffer_pools, index);
+ uword page_mask = ~pow2_mask (m->log2_page_size);
+ u8 *p;
+ u32 alloc_size;
+ va_list va;
- if (bp->start)
- return clib_error_return (0, "buffer with index %u already exists",
- index);
+ if (vec_len (bm->buffer_pools) >= 255)
+ return ~0;
- if (index >= 255)
- return clib_error_return (0, "buffer index must be < 255", index);
+ vec_add2_aligned (bm->buffer_pools, bp, 1, CLIB_CACHE_LINE_BYTES);
if (bm->buffer_mem_size == 0)
{
bp->buffer_template.buffer_pool_index = bp->index;
bp->buffer_template.ref_count = 1;
bp->physmem_map_index = physmem_map_index;
- bp->name = format (0, "%s%c", name, 0);
bp->data_size = data_size;
bp->numa_node = m->numa_node;
+ bp->log2_page_size = m->log2_page_size;
- vec_validate_aligned (bp->threads, vec_len (vlib_mains) - 1,
+ va_start (va, fmt);
+ bp->name = va_format (0, fmt, &va);
+ va_end (va);
+
+ vec_validate_aligned (bp->threads, vlib_get_n_threads () - 1,
CLIB_CACHE_LINE_BYTES);
- alloc_size = data_size + sizeof (vlib_buffer_t) + bm->ext_hdr_size;
- n_alloc_per_page = (1ULL << m->log2_page_size) / alloc_size;
+ alloc_size = vlib_buffer_alloc_size (bm->ext_hdr_size, data_size);
+ bp->alloc_size = alloc_size;
/* preallocate buffer indices memory */
- vec_validate_aligned (bp->buffers, m->n_pages * n_alloc_per_page,
- CLIB_CACHE_LINE_BYTES);
- vec_reset_length (bp->buffers);
+ bp->buffers = clib_mem_alloc_aligned (
+ round_pow2 ((size / alloc_size) * sizeof (u32), CLIB_CACHE_LINE_BYTES),
+ CLIB_CACHE_LINE_BYTES);
clib_spinlock_init (&bp->lock);
- for (j = 0; j < m->n_pages; j++)
- for (i = 0; i < n_alloc_per_page; i++)
- {
- u8 *p;
- u32 bi;
+ p = m->base;
- p = m->base + (j << m->log2_page_size) + i * alloc_size;
- p += bm->ext_hdr_size;
+ /* start with naturally aligned address */
+ p += alloc_size - (uword) p % alloc_size;
- vlib_buffer_copy_template ((vlib_buffer_t *) p, &bp->buffer_template);
+ /*
+ * Waste 1 buffer (maximum) so that 0 is never a valid buffer index.
+ * Allows various places to ASSERT (bi != 0). Much easier
+ * than debugging downstream crashes in successor nodes.
+ */
+ if (p == m->base)
+ p += alloc_size;
- bi = vlib_get_buffer_index (vm, (vlib_buffer_t *) p);
-
- vec_add1_aligned (bp->buffers, bi, CLIB_CACHE_LINE_BYTES);
- vlib_get_buffer (vm, bi);
- }
+ for (; p < (u8 *) m->base + size - alloc_size; p += alloc_size)
+ {
+ vlib_buffer_t *b;
+ u32 bi;
+
+ /* skip if buffer spans across page boundary */
+ if (((uword) p & page_mask) != ((uword) (p + alloc_size) & page_mask))
+ continue;
+
+ b = (vlib_buffer_t *) (p + bm->ext_hdr_size);
+ vlib_buffer_copy_template (b, &bp->buffer_template);
+ bi = vlib_get_buffer_index (vm, b);
+ bp->buffers[bp->n_avail++] = bi;
+ vlib_get_buffer (vm, bi);
+ }
- bp->n_buffers = vec_len (bp->buffers);
+ bp->n_buffers = bp->n_avail;
- return 0;
+ return bp->index;
}
static u8 *
/* *INDENT-OFF* */
vec_foreach (bpt, bp->threads)
- cached += vec_len (bpt->cached_buffers);
+ cached += bpt->n_cached;
/* *INDENT-ON* */
s = format (s, "%-20s%=6d%=6d%=6u%=11u%=6u%=8u%=8u%=8u",
bp->name, bp->index, bp->numa_node, bp->data_size +
sizeof (vlib_buffer_t) + vm->buffer_main->ext_hdr_size,
- bp->data_size, bp->n_buffers, vec_len (bp->buffers), cached,
- bp->n_buffers - vec_len (bp->buffers) - cached);
+ bp->data_size, bp->n_buffers, bp->n_avail, cached,
+ bp->n_buffers - bp->n_avail - cached);
return s;
}
-static clib_error_t *
-show_buffers (vlib_main_t * vm,
- unformat_input_t * input, vlib_cli_command_t * cmd)
+u8 *
+format_vlib_buffer_pool_all (u8 *s, va_list *va)
{
+ vlib_main_t *vm = va_arg (*va, vlib_main_t *);
vlib_buffer_main_t *bm = vm->buffer_main;
vlib_buffer_pool_t *bp;
- vlib_cli_output (vm, "%U", format_vlib_buffer_pool, vm, 0);
+ s = format (s, "%U", format_vlib_buffer_pool, vm, 0);
- /* *INDENT-OFF* */
vec_foreach (bp, bm->buffer_pools)
- vlib_cli_output (vm, "%U", format_vlib_buffer_pool, vm, bp);
- /* *INDENT-ON* */
+ s = format (s, "\n%U", format_vlib_buffer_pool, vm, bp);
+
+ return s;
+}
+static clib_error_t *
+show_buffers (vlib_main_t *vm, unformat_input_t *input,
+ vlib_cli_command_t *cmd)
+{
+ vlib_cli_output (vm, "%U", format_vlib_buffer_pool_all, vm);
return 0;
}
/* *INDENT-ON* */
clib_error_t *
-vlib_buffer_worker_init (vlib_main_t * vm)
+vlib_buffer_num_workers_change (vlib_main_t *vm)
{
vlib_buffer_main_t *bm = vm->buffer_main;
vlib_buffer_pool_t *bp;
- /* *INDENT-OFF* */
vec_foreach (bp, bm->buffer_pools)
- {
- clib_spinlock_lock (&bp->lock);
- vec_validate_aligned (bp->threads, vec_len (vlib_mains) - 1,
- CLIB_CACHE_LINE_BYTES);
- clib_spinlock_unlock (&bp->lock);
- }
- /* *INDENT-ON* */
+ vec_validate_aligned (bp->threads, vlib_get_n_threads () - 1,
+ CLIB_CACHE_LINE_BYTES);
return 0;
}
-VLIB_WORKER_INIT_FUNCTION (vlib_buffer_worker_init);
+VLIB_NUM_WORKERS_CHANGE_FN (vlib_buffer_num_workers_change);
static clib_error_t *
-vlib_buffer_main_init_numa_node (struct vlib_main_t *vm, u32 numa_node)
+vlib_buffer_main_init_numa_alloc (struct vlib_main_t *vm, u32 numa_node,
+ u32 * physmem_map_index,
+ clib_mem_page_sz_t log2_page_size,
+ u8 unpriv)
{
vlib_buffer_main_t *bm = vm->buffer_main;
+ u32 buffers_per_numa = bm->buffers_per_numa;
clib_error_t *error;
- u32 physmem_map_index;
+ u32 buffer_size;
uword n_pages, pagesize;
- u32 buffers_per_numa;
- u32 buffer_size = CLIB_CACHE_LINE_ROUND (bm->ext_hdr_size +
- sizeof (vlib_buffer_t) +
- VLIB_BUFFER_DATA_SIZE);
- u8 *name;
+ u8 *name = 0;
- pagesize = clib_mem_get_default_hugepage_size ();
- name = format (0, "buffers-numa-%d%c", numa_node, 0);
+ ASSERT (log2_page_size != CLIB_MEM_PAGE_SZ_UNKNOWN);
+
+ pagesize = clib_mem_page_bytes (log2_page_size);
+ buffer_size = vlib_buffer_alloc_size (bm->ext_hdr_size,
+ vlib_buffer_get_default_data_size
+ (vm));
+ if (buffer_size > pagesize)
+ return clib_error_return (0, "buffer size (%llu) is greater than page "
+ "size (%llu)", buffer_size, pagesize);
- buffers_per_numa = bm->buffers_per_numa ? bm->buffers_per_numa :
- VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA;
+ if (buffers_per_numa == 0)
+ buffers_per_numa = unpriv ? VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV :
+ VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA;
-retry:
+ name = format (0, "buffers-numa-%d%c", numa_node, 0);
n_pages = (buffers_per_numa - 1) / (pagesize / buffer_size) + 1;
error = vlib_physmem_shared_map_create (vm, (char *) name,
n_pages * pagesize,
min_log2 (pagesize), numa_node,
- &physmem_map_index);
+ physmem_map_index);
+ vec_free (name);
+ return error;
+}
- if (error && pagesize != clib_mem_get_page_size ())
+static clib_error_t *
+vlib_buffer_main_init_numa_node (struct vlib_main_t *vm, u32 numa_node,
+ u8 * index)
+{
+ vlib_buffer_main_t *bm = vm->buffer_main;
+ u32 physmem_map_index;
+ clib_error_t *error;
+
+ if (bm->log2_page_size == CLIB_MEM_PAGE_SZ_UNKNOWN)
{
- vlib_log_warn (bm->log_default, "%U", format_clib_error, error);
+ error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
+ &physmem_map_index,
+ CLIB_MEM_PAGE_SZ_DEFAULT_HUGE,
+ 0 /* unpriv */ );
+ if (!error)
+ goto buffer_pool_create;
+
+ /* If alloc failed, retry without hugepages */
+ vlib_log_warn (bm->log_default,
+ "numa[%u] falling back to non-hugepage backed "
+ "buffer pool (%U)", numa_node, format_clib_error, error);
clib_error_free (error);
- vlib_log_warn (bm->log_default, "falling back to non-hugepage "
- "backed buffer pool");
- pagesize = clib_mem_get_page_size ();
- buffers_per_numa = bm->buffers_per_numa ? bm->buffers_per_numa :
- VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV;
- goto retry;
- }
+ error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
+ &physmem_map_index,
+ CLIB_MEM_PAGE_SZ_DEFAULT,
+ 1 /* unpriv */ );
+ }
+ else
+ error = vlib_buffer_main_init_numa_alloc (vm, numa_node,
+ &physmem_map_index,
+ bm->log2_page_size,
+ 0 /* unpriv */ );
if (error)
return error;
- vec_reset_length (name);
- name = format (name, "default-numa-%d%c", numa_node, 0);
+buffer_pool_create:
+ *index =
+ vlib_buffer_pool_create (vm, vlib_buffer_get_default_data_size (vm),
+ physmem_map_index, "default-numa-%d", numa_node);
+
+ if (*index == (u8) ~ 0)
+ error = clib_error_return (0, "maximum number of buffer pools reached");
+
- return vlib_buffer_pool_create (vm, numa_node, (char *) name,
- VLIB_BUFFER_DATA_SIZE, physmem_map_index);
+ return error;
+}
+
+void
+vlib_buffer_main_alloc (vlib_main_t * vm)
+{
+ vlib_buffer_main_t *bm;
+
+ if (vm->buffer_main)
+ return;
+
+ vm->buffer_main = bm = clib_mem_alloc (sizeof (bm[0]));
+ clib_memset (vm->buffer_main, 0, sizeof (bm[0]));
+ bm->default_data_size = VLIB_BUFFER_DEFAULT_DATA_SIZE;
+}
+
+static u32
+buffer_get_cached (vlib_buffer_pool_t * bp)
+{
+ u32 cached = 0;
+ vlib_buffer_pool_thread_t *bpt;
+
+ clib_spinlock_lock (&bp->lock);
+
+ /* *INDENT-OFF* */
+ vec_foreach (bpt, bp->threads)
+ cached += bpt->n_cached;
+ /* *INDENT-ON* */
+
+ clib_spinlock_unlock (&bp->lock);
+
+ return cached;
+}
+
+static vlib_buffer_pool_t *
+buffer_get_by_index (vlib_buffer_main_t * bm, u32 index)
+{
+ vlib_buffer_pool_t *bp;
+ if (!bm->buffer_pools || vec_len (bm->buffer_pools) < index)
+ return 0;
+ bp = vec_elt_at_index (bm->buffer_pools, index);
+
+ return bp;
+}
+
+static void
+buffer_gauges_collect_used_fn (vlib_stats_collector_data_t *d)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ vlib_buffer_pool_t *bp =
+ buffer_get_by_index (vm->buffer_main, d->private_data);
+ if (!bp)
+ return;
+
+ d->entry->value = bp->n_buffers - bp->n_avail - buffer_get_cached (bp);
+}
+
+static void
+buffer_gauges_collect_available_fn (vlib_stats_collector_data_t *d)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ vlib_buffer_pool_t *bp =
+ buffer_get_by_index (vm->buffer_main, d->private_data);
+ if (!bp)
+ return;
+
+ d->entry->value = bp->n_avail;
+}
+
+static void
+buffer_gauges_collect_cached_fn (vlib_stats_collector_data_t *d)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ vlib_buffer_pool_t *bp =
+ buffer_get_by_index (vm->buffer_main, d->private_data);
+ if (!bp)
+ return;
+
+ d->entry->value = buffer_get_cached (bp);
}
clib_error_t *
-vlib_buffer_main_init (struct vlib_main_t *vm)
+vlib_buffer_main_init (struct vlib_main_t * vm)
{
vlib_buffer_main_t *bm;
clib_error_t *err;
- clib_bitmap_t *bmp = 0;
+ clib_bitmap_t *bmp = 0, *bmp_has_memory = 0;
u32 numa_node;
+ vlib_buffer_pool_t *bp;
+ u8 *name = 0, first_valid_buffer_pool_index = ~0;
- if (vm->buffer_main == 0)
- {
- vm->buffer_main = clib_mem_alloc (sizeof (bm[0]));
- clib_memset (vm->buffer_main, 0, sizeof (bm[0]));
- }
+ vlib_buffer_main_alloc (vm);
bm = vm->buffer_main;
bm->log_default = vlib_log_register_class ("buffer", 0);
clib_spinlock_init (&bm->buffer_known_hash_lockp);
- err = clib_sysfs_read ("/sys/devices/system/node/possible", "%U",
- unformat_bitmap_list, &bmp);
- if (err)
+ if ((err = clib_sysfs_read ("/sys/devices/system/node/online", "%U",
+ unformat_bitmap_list, &bmp)))
+ clib_error_free (err);
+
+ if ((err = clib_sysfs_read ("/sys/devices/system/node/has_memory", "%U",
+ unformat_bitmap_list, &bmp_has_memory)))
+ clib_error_free (err);
+
+ if (bmp && bmp_has_memory)
+ bmp = clib_bitmap_and (bmp, bmp_has_memory);
+
+ /* no info from sysfs, assuming that only numa 0 exists */
+ if (bmp == 0)
+ bmp = clib_bitmap_set (bmp, 0, 1);
+
+ if (clib_bitmap_last_set (bmp) >= VLIB_BUFFER_MAX_NUMA_NODES)
+ clib_panic ("system have more than %u NUMA nodes",
+ VLIB_BUFFER_MAX_NUMA_NODES);
+
+ /* *INDENT-OFF* */
+ clib_bitmap_foreach (numa_node, bmp)
{
- /* no info from sysfs, assuming that only numa 0 exists */
- clib_error_free (err);
- bmp = clib_bitmap_set (bmp, 0, 1);
+ u8 *index = bm->default_buffer_pool_index_for_numa + numa_node;
+ index[0] = ~0;
+ if ((err = vlib_buffer_main_init_numa_node (vm, numa_node, index)))
+ {
+ clib_error_report (err);
+ clib_error_free (err);
+ continue;
+ }
+
+ if (first_valid_buffer_pool_index == 0xff)
+ first_valid_buffer_pool_index = index[0];
+ }
+ /* *INDENT-ON* */
+
+ if (first_valid_buffer_pool_index == (u8) ~ 0)
+ {
+ err = clib_error_return (0, "failed to allocate buffer pool(s)");
+ goto done;
}
/* *INDENT-OFF* */
- clib_bitmap_foreach (numa_node, bmp, {
- if ((err = vlib_buffer_main_init_numa_node(vm, numa_node)))
- goto done;
- });
+ clib_bitmap_foreach (numa_node, bmp)
+ {
+ if (bm->default_buffer_pool_index_for_numa[numa_node] == (u8) ~0)
+ bm->default_buffer_pool_index_for_numa[numa_node] =
+ first_valid_buffer_pool_index;
+ }
/* *INDENT-ON* */
- bm->n_numa_nodes = clib_bitmap_last_set (bmp) + 1;
+ vec_foreach (bp, bm->buffer_pools)
+ {
+ vlib_stats_collector_reg_t reg = { .private_data = bp - bm->buffer_pools };
+ if (bp->n_buffers == 0)
+ continue;
+
+ reg.entry_index =
+ vlib_stats_add_gauge ("/buffer-pools/%s/cached", bp->name);
+ reg.collect_fn = buffer_gauges_collect_cached_fn;
+ vlib_stats_register_collector_fn (®);
+
+ reg.entry_index = vlib_stats_add_gauge ("/buffer-pools/%s/used", bp->name);
+ reg.collect_fn = buffer_gauges_collect_used_fn;
+ vlib_stats_register_collector_fn (®);
+
+ reg.entry_index =
+ vlib_stats_add_gauge ("/buffer-pools/%s/available", bp->name);
+ reg.collect_fn = buffer_gauges_collect_available_fn;
+ vlib_stats_register_collector_fn (®);
+ }
done:
vec_free (bmp);
+ vec_free (bmp_has_memory);
+ vec_free (name);
return err;
}
{
vlib_buffer_main_t *bm;
- if (vm->buffer_main == 0)
- {
- vm->buffer_main = clib_mem_alloc (sizeof (bm[0]));
- clib_memset (vm->buffer_main, 0, sizeof (bm[0]));
- }
+ vlib_buffer_main_alloc (vm);
bm = vm->buffer_main;
+ bm->log2_page_size = CLIB_MEM_PAGE_SZ_UNKNOWN;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "buffers-per-numa %u", &bm->buffers_per_numa))
;
+ else if (unformat (input, "page-size %U", unformat_log2_page_size,
+ &bm->log2_page_size))
+ ;
+ else if (unformat (input, "default data-size %u",
+ &bm->default_data_size))
+ ;
else
return unformat_parse_error (input);
}
VLIB_EARLY_CONFIG_FUNCTION (vlib_buffers_configure, "buffers");
+#if VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0
+u32
+vlib_buffer_alloc_may_fail (vlib_main_t * vm, u32 n_buffers)
+{
+ f64 r;
+
+ r = random_f64 (&vm->buffer_alloc_success_seed);
+
+ /* Fail this request? */
+ if (r > vm->buffer_alloc_success_rate)
+ n_buffers--;
+ /* 5% chance of returning nothing at all */
+ if (r > vm->buffer_alloc_success_rate && r > 0.95)
+ n_buffers = 0;
+
+ return n_buffers;
+}
+#endif
+
+__clib_export int
+vlib_buffer_set_alloc_free_callback (
+ vlib_main_t *vm, vlib_buffer_alloc_free_callback_t *alloc_callback_fn,
+ vlib_buffer_alloc_free_callback_t *free_callback_fn)
+{
+ vlib_buffer_main_t *bm = vm->buffer_main;
+ if ((alloc_callback_fn && bm->alloc_callback_fn) ||
+ (free_callback_fn && bm->free_callback_fn))
+ return 1;
+ bm->alloc_callback_fn = alloc_callback_fn;
+ bm->free_callback_fn = free_callback_fn;
+ return 0;
+}
/** @endcond */
/*