vpp - Vector Packet Processing

diff options

Diffstat (limited to 'src/vnet/session/session_node.c')

-rw-r--r--

1 files changed, 20 insertions, 7 deletions

/* * 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 <vlib/vlib.h> #include <vlib/unix/unix.h> vlib_buffer_callbacks_t *vlib_buffer_callbacks = 0; static u32 vlib_buffer_physmem_sz = 32 << 20; vlib_buffer_main_t buffer_main; 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 (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, free-list %d, clone-count %u", b->current_data, b->current_length, vlib_buffer_get_free_list_index (b), b->n_add_refs); 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 0x%x", b->trace_index); if (a) s = format (s, "\n%U%v", format_white_space, indent, a); vec_free (a); 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); s = format (s, "\n%Unext-buffer 0x%x, segment length %d, clone-count %u", format_white_space, indent, next_buffer, b->current_length, b->n_add_refs); } 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_t *b = vlib_get_buffer (vm, bi); vlib_buffer_free_list_t *fl; if (pool_is_free_index (vm->buffer_free_list_pool, vlib_buffer_get_free_list_index (b))) return format (0, "unknown free list 0x%x", vlib_buffer_get_free_list_index (b)); fl = pool_elt_at_index (vm->buffer_free_list_pool, vlib_buffer_get_free_list_index (b)); 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 > fl->n_data_bytes) return format (0, "%d-%d beyond end of buffer %d", b->current_data, b->current_length, fl->n_data_bytes); if (follow_buffer_next && (b->flags & VLIB_BUFFER_NEXT_PRESENT)) { vlib_buffer_known_state_t k; u8 *msg, *result; k = vlib_buffer_is_known (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 (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; } /* * 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 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) { u32 *b; uword i, bi, is_free; if (CLIB_DEBUG == 0) return; if (vlib_buffer_callbacks) 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 (bi); if (known != expected_state) { ASSERT (0); vlib_panic_with_msg (vm, "%s %U buffer 0x%x", is_free ? "freeing" : "allocating", format_vlib_buffer_known_state, known, bi); } vlib_buffer_set_known_state (bi, is_free ? VLIB_BUFFER_KNOWN_FREE : VLIB_BUFFER_KNOWN_ALLOCATED); } } /* Add buffer free list. */ static vlib_buffer_free_list_index_t vlib_buffer_create_free_list_helper (vlib_main_t * vm, u32 n_data_bytes, u32 is_public, u32 is_default, u8 * name) { vlib_buffer_main_t *bm = &buffer_main; vlib_buffer_free_list_t *f; int i; ASSERT (vlib_get_thread_index () == 0); if (!is_default && pool_elts (vm->buffer_free_list_pool) == 0) { vlib_buffer_free_list_index_t default_free_free_list_index; /* *INDENT-OFF* */ default_free_free_list_index = vlib_buffer_create_free_list_helper (vm, /* default buffer size */ VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES, /* is_public */ 1, /* is_default */ 1, (u8 *) "default"); /* *INDENT-ON* */ ASSERT (default_free_free_list_index == VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); if (n_data_bytes == VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES && is_public) return default_free_free_list_index; } pool_get_aligned (vm->buffer_free_list_pool, f, CLIB_CACHE_LINE_BYTES); clib_memset (f, 0, sizeof (f[0])); f->index = f - vm->buffer_free_list_pool; f->n_data_bytes = vlib_buffer_round_size (n_data_bytes); f->min_n_buffers_each_alloc = VLIB_FRAME_SIZE; f->buffer_pool_index = 0; f->name = clib_mem_is_vec (name) ? name : format (0, "%s", name); /* Setup free buffer template. */ vlib_buffer_set_free_list_index (&f->buffer_init_template, f->index); f->buffer_init_template.n_add_refs = 0; if (is_public) { uword *p = hash_get (bm->free_list_by_size, f->n_data_bytes); if (!p) hash_set (bm->free_list_by_size, f->n_data_bytes, f->index); } for (i = 1; i < vec_len (vlib_mains); i++) { vlib_main_t *wvm = vlib_mains[i]; vlib_buffer_free_list_t *wf; pool_get_aligned (wvm->buffer_free_list_pool, wf, CLIB_CACHE_LINE_BYTES); ASSERT (f - vm->buffer_free_list_pool == wf - wvm->buffer_free_list_pool); wf[0] = f[0]; wf->buffers = 0; wf->n_alloc = 0; } return f->index; } vlib_buffer_free_list_index_t vlib_buffer_create_free_list (vlib_main_t * vm, u32 n_data_bytes, char *fmt, ...) { va_list va; u8 *name; va_start (va, fmt); name = va_format (0, fmt, &va); va_end (va); return vlib_buffer_create_free_list_helper (vm, n_data_bytes, /* is_public */ 0, /* is_default */ 0, name); } static void del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f) { vlib_buffer_pool_t *bp = vlib_buffer_pool_get (f->buffer_pool_index); vec_add_aligned (bp->buffers, f->buffers, vec_len (f->buffers), CLIB_CACHE_LINE_BYTES); vec_free (f->name); vec_free (f->buffers); /* Poison it. */ clib_memset (f, 0xab, sizeof (f[0])); } /* Add buffer free list. */ void vlib_buffer_delete_free_list_internal (vlib_main_t * vm, vlib_buffer_free_list_index_t index) { vlib_buffer_free_list_t *f; int i; ASSERT (vlib_get_thread_index () == 0); f = vlib_buffer_get_free_list (vm, index); ASSERT (vec_len (f->buffers) == f->n_alloc); del_free_list (vm, f); pool_put (vm->buffer_free_list_pool, f); for (i = 1; i < vec_len (vlib_mains); i++) { vlib_main_t *wvm = vlib_mains[i]; f = vlib_buffer_get_free_list (vlib_mains[i], index); del_free_list (wvm, f); pool_put (wvm->buffer_free_list_pool, f); } } static_always_inline void * vlib_buffer_pool_get_buffer (vlib_buffer_pool_t * bp) { uword slot, page, addr; if (PREDICT_FALSE (bp->n_elts == bp->n_used)) { clib_spinlock_unlock (&bp->lock); return 0; } slot = bp->next_clear; bp->bitmap = clib_bitmap_set (bp->bitmap, slot, 1); bp->next_clear = clib_bitmap_next_clear (bp->bitmap, slot + 1); bp->n_used++; page = slot / bp->buffers_per_page; slot -= page * bp->buffers_per_page; addr = bp->start + (page << bp->log2_page_size) + slot * bp->buffer_size; return uword_to_pointer (addr, void *); } /* Make sure free list has at least given number of free buffers. */ static uword vlib_buffer_fill_free_list_internal (vlib_main_t * vm, vlib_buffer_free_list_t * fl, uword min_free_buffers) { vlib_buffer_t *b; vlib_buffer_pool_t *bp = vlib_buffer_pool_get (fl->buffer_pool_index); int n; u32 *bi; u32 n_alloc = 0; /* Already have enough free buffers on free list? */ n = min_free_buffers - vec_len (fl->buffers); if (n <= 0) return min_free_buffers; if (vec_len (bp->buffers) > 0) { int n_copy, n_left; clib_spinlock_lock (&bp->lock); n_copy = clib_min (vec_len (bp->buffers), n); n_left = vec_len (bp->buffers) - n_copy; vec_add_aligned (fl->buffers, bp->buffers + n_left, n_copy, CLIB_CACHE_LINE_BYTES); _vec_len (bp->buffers) = n_left; clib_spinlock_unlock (&bp->lock); n = min_free_buffers - vec_len (fl->buffers); if (n <= 0) return min_free_buffers; } /* Always allocate round number of buffers. */ n = round_pow2 (n, CLIB_CACHE_LINE_BYTES / sizeof (u32)); /* Always allocate new buffers in reasonably large sized chunks. */ n = clib_max (n, fl->min_n_buffers_each_alloc); clib_spinlock_lock (&bp->lock); while (n_alloc < n) { if ((b = vlib_buffer_pool_get_buffer (bp)) == 0) goto done; n_alloc += 1; vec_add2_aligned (fl->buffers, bi, 1, CLIB_CACHE_LINE_BYTES); bi[0] = vlib_get_buffer_index (vm, b); if (CLIB_DEBUG > 0) vlib_buffer_set_known_state (bi[0], VLIB_BUFFER_KNOWN_FREE); clib_memset (b, 0, sizeof (vlib_buffer_t)); vlib_buffer_init_for_free_list (b, fl); if (fl->buffer_init_function) fl->buffer_init_function (vm, fl, bi, 1); } done: clib_spinlock_unlock (&bp->lock); fl->n_alloc += n_alloc; return n_alloc; } void * vlib_set_buffer_free_callback (vlib_main_t * vm, void *fp) { vlib_buffer_main_t *bm = &buffer_main; void *rv = bm->buffer_free_callback; bm->buffer_free_callback = fp; return rv; } static_always_inline void recycle_or_free (vlib_main_t * vm, vlib_buffer_main_t * bm, u32 bi, vlib_buffer_t * b, u32 follow_buffer_next) { vlib_buffer_free_list_t *fl; vlib_buffer_free_list_index_t fi; u32 flags, next; fl = vlib_buffer_get_buffer_free_list (vm, b, &fi); do { vlib_buffer_t *nb = vlib_get_buffer (vm, bi); flags = nb->flags; next = nb->next_buffer; if (nb->n_add_refs) nb->n_add_refs--; else { vlib_buffer_validate_alloc_free (vm, &bi, 1, VLIB_BUFFER_KNOWN_ALLOCATED); vlib_buffer_add_to_free_list (vm, fl, bi, 1); } bi = next; } while (follow_buffer_next && (flags & VLIB_BUFFER_NEXT_PRESENT)); } static_always_inline void vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers, u32 follow_buffer_next) { vlib_buffer_main_t *bm = &buffer_main; vlib_buffer_t *p, *b0, *b1, *b2, *b3; int i = 0; u32 (*cb) (vlib_main_t * vm, u32 * buffers, u32 n_buffers, u32 follow_buffer_next); cb = bm->buffer_free_callback; if (PREDICT_FALSE (cb != 0)) n_buffers = (*cb) (vm, buffers, n_buffers, follow_buffer_next); if (!n_buffers) return; while (i + 11 < n_buffers) { p = vlib_get_buffer (vm, buffers[i + 8]); vlib_prefetch_buffer_header (p, LOAD); p = vlib_get_buffer (vm, buffers[i + 9]); vlib_prefetch_buffer_header (p, LOAD); p = vlib_get_buffer (vm, buffers[i + 10]); vlib_prefetch_buffer_header (p, LOAD); p = vlib_get_buffer (vm, buffers[i + 11]); vlib_prefetch_buffer_header (p, LOAD); b0 = vlib_get_buffer (vm, buffers[i]); b1 = vlib_get_buffer (vm, buffers[i + 1]); b2 = vlib_get_buffer (vm, buffers[i + 2]); b3 = vlib_get_buffer (vm, buffers[i + 3]); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b2); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b3); recycle_or_free (vm, bm, buffers[i], b0, follow_buffer_next); recycle_or_free (vm, bm, buffers[i + 1], b1, follow_buffer_next); recycle_or_free (vm, bm, buffers[i + 2], b2, follow_buffer_next); recycle_or_free (vm, bm, buffers[i + 3], b3, follow_buffer_next); i += 4; } while (i < n_buffers) { b0 = vlib_get_buffer (vm, buffers[i]); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); recycle_or_free (vm, bm, buffers[i], b0, follow_buffer_next); i++; } } static void vlib_buffer_free_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers) { vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */ 1); } static void vlib_buffer_free_no_next_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers) { vlib_buffer_free_inline (vm, buffers, n_buffers, /* follow_buffer_next */ 0); } /* Copy template packet data into buffers as they are allocated. */ static void __attribute__ ((unused)) vlib_packet_template_buffer_init (vlib_main_t * vm, vlib_buffer_free_list_t * fl, u32 * buffers, u32 n_buffers) { vlib_packet_template_t *t = uword_to_pointer (fl->buffer_init_function_opaque, vlib_packet_template_t *); uword i; for (i = 0; i < n_buffers; i++) { vlib_buffer_t *b = vlib_get_buffer (vm, buffers[i]); ASSERT (b->current_length == vec_len (t->packet_data)); clib_memcpy (vlib_buffer_get_current (b), t->packet_data, b->current_length); } } 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, ...) { vlib_buffer_main_t *bm = &buffer_main; va_list va; u8 *name; vlib_buffer_free_list_t *fl; va_start (va, fmt); name = va_format (0, fmt, &va); va_end (va); if (bm->cb.vlib_packet_template_init_cb) bm->cb.vlib_packet_template_init_cb (vm, (void *) t, packet_data, n_packet_data_bytes, min_n_buffers_each_alloc, name); 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; t->free_list_index = vlib_buffer_create_free_list_helper (vm, n_packet_data_bytes, /* is_public */ 1, /* is_default */ 0, name); ASSERT (t->free_list_index != 0); fl = vlib_buffer_get_free_list (vm, t->free_list_index); fl->min_n_buffers_each_alloc = t->min_n_buffers_each_alloc; fl->buffer_init_function = vlib_packet_template_buffer_init; fl->buffer_init_function_opaque = pointer_to_uword (t); fl->buffer_init_template.current_data = 0; fl->buffer_init_template.current_length = n_packet_data_bytes; fl->buffer_init_template.flags = 0; fl->buffer_init_template.n_add_refs = 0; 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 (vlib_buffer_get_current (b), t->packet_data, vec_len (t->packet_data)); b->current_length = vec_len (t->packet_data); return b->data; } void vlib_packet_template_get_packet_helper (vlib_main_t * vm, vlib_packet_template_t * t) { word n = t->min_n_buffers_each_alloc; word l = vec_len (t->packet_data); word n_alloc; ASSERT (l > 0); ASSERT (vec_len (t->free_buffers) == 0); vec_validate (t->free_buffers, n - 1); n_alloc = vlib_buffer_alloc_from_free_list (vm, t->free_buffers, n, t->free_list_index); _vec_len (t->free_buffers) = n_alloc; } /* Append given data to end of buffer, possibly allocating new buffers. */ u32 vlib_buffer_add_data (vlib_main_t * vm, vlib_buffer_free_list_index_t free_list_index, 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_from_free_list (vm, &bi, 1, free_list_index)) goto out_of_buffers; d = data; n_left = n_data_bytes; n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm, free_list_index); 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 (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_from_free_list (vm, &b->next_buffer, 1, free_list_index)) goto out_of_buffers; b->flags |= VLIB_BUFFER_NEXT_PRESENT; b = vlib_get_buffer (vm, b->next_buffer); } return bi; out_of_buffers: clib_error ("out of buffers"); return bi; } u16 vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm, vlib_buffer_free_list_index_t free_list_index, vlib_buffer_t * first, vlib_buffer_t ** last, void *data, u16 data_len) { vlib_buffer_t *l = *last; u32 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm, free_list_index); 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_free_list (vm, &l->next_buffer, 1, free_list_index)) return copied; *last = l = vlib_buffer_chain_buffer (vm, first, l, l->next_buffer); max = n_buffer_bytes - l->current_length - l->current_data; } u16 len = (data_len > max) ? max : data_len; clib_memcpy (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; } u8 vlib_buffer_pool_create (vlib_main_t * vm, vlib_physmem_region_index_t pri, u16 buffer_size) { vlib_buffer_main_t *bm = &buffer_main; vlib_physmem_region_t *pr = vlib_physmem_get_region (vm, pri); vlib_buffer_pool_t *p; uword start = pointer_to_uword (pr->mem); uword size = pr->size; 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!"); } vec_add2 (bm->buffer_pools, p, 1); p->start = start; p->size = size; p->physmem_region = pri; if (buffer_size == 0) goto done; p->log2_page_size = pr->log2_page_size; p->buffer_size = buffer_size; p->buffers_per_page = (1ull << pr->log2_page_size) / p->buffer_size; p->n_elts = p->buffers_per_page * pr->n_pages; p->n_used = 0; clib_spinlock_init (&p->lock); done: ASSERT (p - bm->buffer_pools < 256); return p - bm->buffer_pools; } static u8 * format_vlib_buffer_free_list (u8 * s, va_list * va) { vlib_buffer_free_list_t *f = va_arg (*va, vlib_buffer_free_list_t *); u32 threadnum = va_arg (*va, u32); uword bytes_alloc, bytes_free, n_free, size; if (!f) return format (s, "%=7s%=30s%=12s%=12s%=12s%=12s%=12s%=12s", "Thread", "Name", "Index", "Size", "Alloc", "Free", "#Alloc", "#Free"); size = sizeof (vlib_buffer_t) + f->n_data_bytes; n_free = vec_len (f->buffers); bytes_alloc = size * f->n_alloc; bytes_free = size * n_free; s = format (s, "%7d%30v%12d%12d%=12U%=12U%=12d%=12d", threadnum, f->name, f->index, f->n_data_bytes, format_memory_size, bytes_alloc, format_memory_size, bytes_free, f->n_alloc, n_free); return s; } static clib_error_t * show_buffers (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vlib_buffer_free_list_t *f; vlib_main_t *curr_vm; u32 vm_index = 0; vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, 0, 0); do { curr_vm = vlib_mains[vm_index]; /* *INDENT-OFF* */ pool_foreach (f, curr_vm->buffer_free_list_pool, ({ vlib_cli_output (vm, "%U", format_vlib_buffer_free_list, f, vm_index); })); /* *INDENT-ON* */ vm_index++; } while (vm_index < vec_len (vlib_mains)); 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_main_init (struct vlib_main_t * vm) { vlib_buffer_main_t *bm = &buffer_main; vlib_physmem_region_index_t pri; clib_error_t *error; if (vlib_buffer_callbacks) { /* external plugin has registered own buffer callbacks so we just copy them and quit */ clib_memcpy (&bm->cb, vlib_buffer_callbacks, sizeof (vlib_buffer_callbacks_t)); bm->callbacks_registered = 1; return 0; } bm->cb.vlib_buffer_fill_free_list_cb = &vlib_buffer_fill_free_list_internal; bm->cb.vlib_buffer_free_cb = &vlib_buffer_free_internal; bm->cb.vlib_buffer_free_no_next_cb = &vlib_buffer_free_no_next_internal; bm->cb.vlib_buffer_delete_free_list_cb = &vlib_buffer_delete_free_list_internal; clib_spinlock_init (&bm->buffer_known_hash_lockp); /* allocate default region */ error = vlib_physmem_region_alloc (vm, "buffers", vlib_buffer_physmem_sz, 0, VLIB_PHYSMEM_F_SHARED | VLIB_PHYSMEM_F_HUGETLB, &pri); if (error == 0) goto done; clib_error_free (error); error = vlib_physmem_region_alloc (vm, "buffers", vlib_buffer_physmem_sz, 0, VLIB_PHYSMEM_F_SHARED, &pri); done: if (error == 0) vlib_buffer_pool_create (vm, pri, sizeof (vlib_buffer_t) + VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES); return error; } static clib_error_t * vlib_buffers_configure (vlib_main_t * vm, unformat_input_t * input) { u32 size_in_mb; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "memory-size-in-mb %d", &size_in_mb)) vlib_buffer_physmem_sz = size_in_mb << 20; else return unformat_parse_error (input); } unformat_free (input); return 0; } VLIB_EARLY_CONFIG_FUNCTION (vlib_buffers_configure, "buffers"); /** @endcond */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


context:
space:
mode: