/* * 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. */ /* * buffer.c: allocate/free network buffers. * * 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. */ /** * @file * * Allocate/free network buffers. */ #include <vppinfra/linux/sysfs.h> #include <vlib/vlib.h> #include <vlib/unix/unix.h> #include <vpp/stats/stat_segment.h> #define VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA 16384 #define VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV 8192 #ifdef CLIB_HAVE_VEC128 /* Assumptions by vlib_buffer_free_inline: */ STATIC_ASSERT_FITS_IN (vlib_buffer_t, flags, 16); STATIC_ASSERT_FITS_IN (vlib_buffer_t, ref_count, 16); STATIC_ASSERT_FITS_IN (vlib_buffer_t, buffer_pool_index, 16); #endif /* Make sure that buffer template size is not accidentally changed */ STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64); u16 __vlib_buffer_external_hdr_size = 0; static void buffer_gauges_update_cached_fn (stat_segment_directory_entry_t * e, u32 index); static void buffer_gauges_update_available_fn (stat_segment_directory_entry_t * e, u32 index); static void buffer_gauges_update_used_fn (stat_segment_directory_entry_t * e, u32 index); uword vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm, vlib_buffer_t * b_first) { vlib_buffer_t *b = b_first; uword l_first = b_first->current_length; uword l = 0; while (b->flags & VLIB_BUFFER_NEXT_PRESENT) { b = vlib_get_buffer (vm, b->next_buffer); l += b->current_length; } b_first->total_length_not_including_first_buffer = l; b_first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; return l + l_first; } u8 * 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); u8 *a = 0; #define _(bit, name, v) \ if (v && (b->flags & VLIB_BUFFER_##name)) \ a = format (a, "%s ", v); foreach_vlib_buffer_flag #undef _ s = format (s, "current data %d, length %d, buffer-pool %d, " "ref-count %u", b->current_data, b->current_length, b->buffer_pool_index, b->ref_count); if (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID) s = format (s, ", totlen-nifb %d", b->total_length_not_including_first_buffer); if (b->flags & VLIB_BUFFER_IS_TRACED) 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) { u32 next_buffer = b->next_buffer; b = vlib_get_buffer (vm, next_buffer); s = format (s, "\n%Unext-buffer 0x%x, segment length %d, ref-count %u", format_white_space, indent, next_buffer, b->current_length, b->ref_count); } return s; } u8 * format_vlib_buffer_and_data (u8 * s, va_list * args) { vlib_buffer_t *b = va_arg (*args, vlib_buffer_t *); s = format (s, "%U, %U", format_vlib_buffer, b, format_hex_bytes, vlib_buffer_get_current (b), 64); return s; } static u8 * format_vlib_buffer_known_state (u8 * s, va_list * args) { vlib_buffer_known_state_t state = va_arg (*args, vlib_buffer_known_state_t); char *t; switch (state) { case VLIB_BUFFER_UNKNOWN: t = "unknown"; break; case VLIB_BUFFER_KNOWN_ALLOCATED: t = "known-allocated"; break; case VLIB_BUFFER_KNOWN_FREE: t = "known-free"; break; default: t = "invalid"; break; } return format (s, "%s", t); } u8 * format_vlib_buffer_contents (u8 * s, va_list * va) { vlib_main_t *vm = va_arg (*va, vlib_main_t *); vlib_buffer_t *b = va_arg (*va, vlib_buffer_t *); while (1) { vec_add (s, vlib_buffer_get_current (b), b->current_length); if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)) break; b = vlib_get_buffer (vm, b->next_buffer); } return s; } static u8 * vlib_validate_buffer_helper (vlib_main_t * vm, u32 bi, uword follow_buffer_next, uword ** unique_hash) { vlib_buffer_main_t *bm = vm->buffer_main; vlib_buffer_t *b = vlib_get_buffer (vm, bi); if (vec_len (bm->buffer_pools) <= b->buffer_pool_index) return format (0, "unknown buffer pool 0x%x", b->buffer_pool_index); 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_get_default_data_size (vm)) return format (0, "%d-%d beyond end of buffer %d", b->current_data, b->current_length, vlib_buffer_get_default_data_size (vm)); if (follow_buffer_next && (b->flags & VLIB_BUFFER_NEXT_PRESENT)) { vlib_buffer_known_state_t k; u8 *msg, *result; k = vlib_buffer_is_known (vm, b->next_buffer); if (k != VLIB_BUFFER_KNOWN_ALLOCATED) return format (0, "next 0x%x: %U", b->next_buffer, format_vlib_buffer_known_state, k); if (unique_hash) { if (hash_get (*unique_hash, b->next_buffer)) return format (0, "duplicate buffer 0x%x", b->next_buffer); hash_set1 (*unique_hash, b->next_buffer); } msg = vlib_validate_buffer (vm, b->next_buffer, follow_buffer_next); if (msg) { result = format (0, "next 0x%x: %v", b->next_buffer, msg); vec_free (msg); return result; } } return 0; } u8 * vlib_validate_buffer (vlib_main_t * vm, u32 bi, uword follow_buffer_next) { return vlib_validate_buffer_helper (vm, bi, follow_buffer_next, /* unique_hash */ 0); } u8 * vlib_validate_buffers (vlib_main_t * vm, u32 * buffers, uword next_buffer_stride, uword n_buffers, vlib_buffer_known_state_t known_state, uword follow_buffer_next) { uword i, *hash; u32 bi, *b = buffers; vlib_buffer_known_state_t k; u8 *msg = 0, *result = 0; hash = hash_create (0, 0); for (i = 0; i < n_buffers; i++) { bi = b[0]; b += next_buffer_stride; /* Buffer is not unique. */ if (hash_get (hash, bi)) { msg = format (0, "not unique"); goto done; } k = vlib_buffer_is_known (vm, bi); if (k != known_state) { msg = format (0, "is %U; expected %U", format_vlib_buffer_known_state, k, format_vlib_buffer_known_state, known_state); goto done; } msg = vlib_validate_buffer_helper (vm, bi, follow_buffer_next, &hash); if (msg) goto done; hash_set1 (hash, bi); } done: if (msg) { result = format (0, "0x%x: %v", bi, msg); vec_free (msg); } hash_free (hash); return result; } /* When debugging validate that given buffers are either known allocated or known free. */ void vlib_buffer_validate_alloc_free (vlib_main_t * vm, u32 * buffers, uword n_buffers, vlib_buffer_known_state_t expected_state) { vlib_buffer_main_t *bm = vm->buffer_main; u32 *b; uword i, bi, is_free; if (CLIB_DEBUG == 0) return; is_free = expected_state == VLIB_BUFFER_KNOWN_ALLOCATED; b = buffers; for (i = 0; i < n_buffers; i++) { vlib_buffer_known_state_t known; bi = b[0]; b += 1; known = vlib_buffer_is_known (vm, bi); if (known == VLIB_BUFFER_UNKNOWN && expected_state == VLIB_BUFFER_KNOWN_FREE) known = VLIB_BUFFER_KNOWN_FREE; if (known != expected_state) { clib_panic ("%s %U buffer 0x%x", is_free ? "freeing" : "allocating", format_vlib_buffer_known_state, known, bi); } clib_spinlock_lock (&bm->buffer_known_hash_lockp); hash_set (bm->buffer_known_hash, bi, is_free ? VLIB_BUFFER_KNOWN_FREE : VLIB_BUFFER_KNOWN_ALLOCATED); clib_spinlock_unlock (&bm->buffer_known_hash_lockp); } } void vlib_packet_template_init (vlib_main_t * vm, vlib_packet_template_t * t, void *packet_data, uword n_packet_data_bytes, uword min_n_buffers_each_alloc, char *fmt, ...) { va_list va; va_start (va, fmt); t->name = va_format (0, fmt, &va); va_end (va); vlib_worker_thread_barrier_sync (vm); clib_memset (t, 0, sizeof (t[0])); vec_add (t->packet_data, packet_data, n_packet_data_bytes); t->min_n_buffers_each_alloc = min_n_buffers_each_alloc; vlib_worker_thread_barrier_release (vm); } void * vlib_packet_template_get_packet (vlib_main_t * vm, vlib_packet_template_t * t, u32 * bi_result) { u32 bi; vlib_buffer_t *b; if (vlib_buffer_alloc (vm, &bi, 1) != 1) return 0; *bi_result = bi; b = vlib_get_buffer (vm, bi); clib_memcpy_fast (vlib_buffer_get_current (b), t->packet_data, vec_len (t->packet_data)); b->current_length = vec_len (t->packet_data); return b->data; } /* Append given data to end of buffer, possibly allocating new buffers. */ int vlib_buffer_add_data (vlib_main_t * vm, u32 * buffer_index, void *data, u32 n_data_bytes) { u32 n_buffer_bytes, n_left, n_left_this_buffer, bi; vlib_buffer_t *b; void *d; bi = *buffer_index; if (bi == ~0 && 1 != vlib_buffer_alloc (vm, &bi, 1)) goto out_of_buffers; d = data; n_left = n_data_bytes; n_buffer_bytes = vlib_buffer_get_default_data_size (vm); b = vlib_get_buffer (vm, bi); b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID; /* Get to the end of the chain before we try to append data... */ while (b->flags & VLIB_BUFFER_NEXT_PRESENT) b = vlib_get_buffer (vm, b->next_buffer); while (1) { u32 n; ASSERT (n_buffer_bytes >= b->current_length); n_left_this_buffer = n_buffer_bytes - (b->current_data + b->current_length); n = clib_min (n_left_this_buffer, n_left); clib_memcpy_fast (vlib_buffer_get_current (b) + b->current_length, d, n); b->current_length += n; n_left -= n; if (n_left == 0) break; d += n; if (1 != vlib_buffer_alloc (vm, &b->next_buffer, 1)) goto out_of_buffers; b->flags |= VLIB_BUFFER_NEXT_PRESENT; b = vlib_get_buffer (vm, b->next_buffer); } *buffer_index = bi; return 0; out_of_buffers: clib_warning ("out of buffers"); return 1; } u16 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm, vlib_buffer_t * first, vlib_buffer_t ** last, void *data, u16 data_len) { vlib_buffer_t *l = *last; 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) { u16 max = n_buffer_bytes - l->current_length - l->current_data; if (max == 0) { if (1 != vlib_buffer_alloc_from_pool (vm, &l->next_buffer, 1, first->buffer_pool_index)) return copied; *last = l = vlib_buffer_chain_buffer (vm, l, l->next_buffer); max = n_buffer_bytes - l->current_length - l->current_data; } u16 len = (data_len > max) ? max : data_len; clib_memcpy_fast (vlib_buffer_get_current (l) + l->current_length, data + copied, len); vlib_buffer_chain_increase_length (first, l, len); data_len -= len; copied += len; } return copied; } 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, char *name, u32 data_size, u32 physmem_map_index) { 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; if (vec_len (bm->buffer_pools) >= 255) return ~0; vec_add2_aligned (bm->buffer_pools, bp, 1, CLIB_CACHE_LINE_BYTES); if (bm->buffer_mem_size == 0) { bm->buffer_mem_start = start; bm->buffer_mem_size = size; } else if (start < bm->buffer_mem_start) { bm->buffer_mem_size += bm->buffer_mem_start - start; bm->buffer_mem_start = start; if (size > bm->buffer_mem_size) bm->buffer_mem_size = size; } else if (start > bm->buffer_mem_start) { uword new_size = start - bm->buffer_mem_start + size; if (new_size > bm->buffer_mem_size) bm->buffer_mem_size = new_size; } if ((u64) bm->buffer_mem_size > ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES))) { clib_panic ("buffer memory size out of range!"); } bp->start = start; bp->size = size; bp->index = bp - bm->buffer_pools; 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; vec_validate_aligned (bp->threads, vlib_get_n_threads () - 1, CLIB_CACHE_LINE_BYTES); alloc_size = vlib_buffer_alloc_size (bm->ext_hdr_size, data_size); n_alloc_per_page = (1ULL << m->log2_page_size) / alloc_size; /* preallocate buffer indices memory */ bp->n_buffers = m->n_pages * n_alloc_per_page; bp->buffers = clib_mem_alloc_aligned (bp->n_buffers * sizeof (u32), 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 + (j << m->log2_page_size) + i * alloc_size; p += bm->ext_hdr_size; /* * 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) continue; vlib_buffer_copy_template ((vlib_buffer_t *) p, &bp->buffer_template); bi = vlib_get_buffer_index (vm, (vlib_buffer_t *) p); bp->buffers[bp->n_avail++] = bi; vlib_get_buffer (vm, bi); } return bp->index; } static u8 * format_vlib_buffer_pool (u8 * s, va_list * va) { vlib_main_t *vm = va_arg (*va, vlib_main_t *); vlib_buffer_pool_t *bp = va_arg (*va, vlib_buffer_pool_t *); vlib_buffer_pool_thread_t *bpt; u32 cached = 0; if (!bp) return format (s, "%-20s%=6s%=6s%=6s%=11s%=6s%=8s%=8s%=8s", "Pool Name", "Index", "NUMA", "Size", "Data Size", "Total", "Avail", "Cached", "Used"); /* *INDENT-OFF* */ vec_foreach (bpt, bp->threads) 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, bp->n_avail, cached, bp->n_buffers - bp->n_avail - cached); return s; } 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; s = format (s, "%U", format_vlib_buffer_pool, vm, 0); vec_foreach (bp, bm->buffer_pools) 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-OFF* */ VLIB_CLI_COMMAND (show_buffers_command, static) = { .path = "show buffers", .short_help = "Show packet buffer allocation", .function = show_buffers, }; /* *INDENT-ON* */ clib_error_t * vlib_buffer_worker_init (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, vlib_get_n_threads () - 1, CLIB_CACHE_LINE_BYTES); clib_spinlock_unlock (&bp->lock); } /* *INDENT-ON* */ return 0; } VLIB_WORKER_INIT_FUNCTION (vlib_buffer_worker_init); static clib_error_t * 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 buffer_size; uword n_pages, pagesize; u8 *name = 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); if (buffers_per_numa == 0) buffers_per_numa = unpriv ? VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA_UNPRIV : VLIB_BUFFER_DEFAULT_BUFFERS_PER_NUMA; 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); vec_free (name); return error; } 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; u8 *name = 0; if (bm->log2_page_size == CLIB_MEM_PAGE_SZ_UNKNOWN) { 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); 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; buffer_pool_create: name = format (name, "default-numa-%d%c", numa_node, 0); *index = vlib_buffer_pool_create (vm, (char *) name, vlib_buffer_get_default_data_size (vm), physmem_map_index); if (*index == (u8) ~ 0) error = clib_error_return (0, "maximum number of buffer pools reached"); vec_free (name); 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_update_used_fn (stat_segment_directory_entry_t * e, u32 index) { vlib_main_t *vm = vlib_get_main (); vlib_buffer_pool_t *bp = buffer_get_by_index (vm->buffer_main, index); if (!bp) return; e->value = bp->n_buffers - bp->n_avail - buffer_get_cached (bp); } static void buffer_gauges_update_available_fn (stat_segment_directory_entry_t * e, u32 index) { vlib_main_t *vm = vlib_get_main (); vlib_buffer_pool_t *bp = buffer_get_by_index (vm->buffer_main, index); if (!bp) return; e->value = bp->n_avail; } static void buffer_gauges_update_cached_fn (stat_segment_directory_entry_t * e, u32 index) { vlib_main_t *vm = vlib_get_main (); vlib_buffer_pool_t *bp = buffer_get_by_index (vm->buffer_main, index); if (!bp) return; e->value = buffer_get_cached (bp); } clib_error_t * vlib_buffer_main_init (struct vlib_main_t * vm) { vlib_buffer_main_t *bm; clib_error_t *err; 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; vlib_buffer_main_alloc (vm); bm = vm->buffer_main; bm->log_default = vlib_log_register_class ("buffer", 0); bm->ext_hdr_size = __vlib_buffer_external_hdr_size; clib_spinlock_init (&bm->buffer_known_hash_lockp); 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) { 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 (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* */ vec_foreach (bp, bm->buffer_pools) { if (bp->n_buffers == 0) continue; vec_reset_length (name); name = format (name, "/buffer-pools/%s/cached%c", bp->name, 0); stat_segment_register_gauge (name, buffer_gauges_update_cached_fn, bp - bm->buffer_pools); vec_reset_length (name); name = format (name, "/buffer-pools/%s/used%c", bp->name, 0); stat_segment_register_gauge (name, buffer_gauges_update_used_fn, bp - bm->buffer_pools); vec_reset_length (name); name = format (name, "/buffer-pools/%s/available%c", bp->name, 0); stat_segment_register_gauge (name, buffer_gauges_update_available_fn, bp - bm->buffer_pools); } done: vec_free (bmp); vec_free (bmp_has_memory); vec_free (name); return err; } static clib_error_t * vlib_buffers_configure (vlib_main_t * vm, unformat_input_t * input) { vlib_buffer_main_t *bm; 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); } unformat_free (input); return 0; } 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 */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */