#include <vppinfra/hash.h>
#include <vppinfra/fifo.h>
+#include <vlib/buffer.h>
+#include <vlib/physmem_funcs.h>
+#include <vlib/main.h>
+#include <vlib/node.h>
/** \file
vlib buffer access methods.
*/
+always_inline void
+vlib_buffer_validate (vlib_main_t * vm, vlib_buffer_t * b)
+{
+ vlib_buffer_main_t *bm = vm->buffer_main;
+ vlib_buffer_pool_t *bp;
+
+ /* reference count in allocated buffer always must be 1 or higher */
+ ASSERT (b->ref_count > 0);
+
+ /* verify that buffer pool index is valid */
+ bp = vec_elt_at_index (bm->buffer_pools, b->buffer_pool_index);
+ ASSERT (pointer_to_uword (b) >= bp->start);
+ ASSERT (pointer_to_uword (b) < bp->start + bp->size -
+ (bp->data_size + sizeof (vlib_buffer_t)));
+}
+
+always_inline void *
+vlib_buffer_ptr_from_index (uword buffer_mem_start, u32 buffer_index,
+ uword offset)
+{
+ offset += ((uword) buffer_index) << CLIB_LOG2_CACHE_LINE_BYTES;
+ return uword_to_pointer (buffer_mem_start + offset, vlib_buffer_t *);
+}
/** \brief Translate buffer index into buffer pointer
always_inline vlib_buffer_t *
vlib_get_buffer (vlib_main_t * vm, u32 buffer_index)
{
- vlib_buffer_main_t *bm = &buffer_main;
- uword offset = ((uword) buffer_index) << CLIB_LOG2_CACHE_LINE_BYTES;
- ASSERT (offset < bm->buffer_mem_size);
+ vlib_buffer_main_t *bm = vm->buffer_main;
+ vlib_buffer_t *b;
- return uword_to_pointer (bm->buffer_mem_start + offset, void *);
+ b = vlib_buffer_ptr_from_index (bm->buffer_mem_start, buffer_index, 0);
+ vlib_buffer_validate (vm, b);
+ return b;
+}
+
+static_always_inline u32
+vlib_buffer_get_default_data_size (vlib_main_t * vm)
+{
+ return vm->buffer_main->default_data_size;
}
static_always_inline void
vlib_buffer_copy_indices (u32 * dst, u32 * src, u32 n_indices)
{
- clib_memcpy_fast (dst, src, n_indices * sizeof (u32));
+#if defined(CLIB_HAVE_VEC512)
+ while (n_indices >= 16)
+ {
+ u32x16_store_unaligned (u32x16_load_unaligned (src), dst);
+ dst += 16;
+ src += 16;
+ n_indices -= 16;
+ }
+#endif
+
+#if defined(CLIB_HAVE_VEC256)
+ while (n_indices >= 8)
+ {
+ u32x8_store_unaligned (u32x8_load_unaligned (src), dst);
+ dst += 8;
+ src += 8;
+ n_indices -= 8;
+ }
+#endif
+
+#if defined(CLIB_HAVE_VEC128)
+ while (n_indices >= 4)
+ {
+ u32x4_store_unaligned (u32x4_load_unaligned (src), dst);
+ dst += 4;
+ src += 4;
+ n_indices -= 4;
+ }
+#endif
+
+ while (n_indices)
+ {
+ dst[0] = src[0];
+ dst += 1;
+ src += 1;
+ n_indices -= 1;
+ }
+}
+
+always_inline void
+vlib_buffer_copy_indices_from_ring (u32 * dst, u32 * ring, u32 start,
+ u32 ring_size, u32 n_buffers)
+{
+ ASSERT (n_buffers <= ring_size);
+
+ if (PREDICT_TRUE (start + n_buffers <= ring_size))
+ {
+ vlib_buffer_copy_indices (dst, ring + start, n_buffers);
+ }
+ else
+ {
+ u32 n = ring_size - start;
+ vlib_buffer_copy_indices (dst, ring + start, n);
+ vlib_buffer_copy_indices (dst + n, ring, n_buffers - n);
+ }
+}
+
+always_inline void
+vlib_buffer_copy_indices_to_ring (u32 * ring, u32 * src, u32 start,
+ u32 ring_size, u32 n_buffers)
+{
+ ASSERT (n_buffers <= ring_size);
+
+ if (PREDICT_TRUE (start + n_buffers <= ring_size))
+ {
+ vlib_buffer_copy_indices (ring + start, src, n_buffers);
+ }
+ else
+ {
+ u32 n = ring_size - start;
+ vlib_buffer_copy_indices (ring + start, src, n);
+ vlib_buffer_copy_indices (ring, src + n, n_buffers - n);
+ }
}
+STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64);
static_always_inline void
vlib_buffer_copy_template (vlib_buffer_t * b, vlib_buffer_t * bt)
{
- clib_memcpy_fast (b, bt, STRUCT_OFFSET_OF (vlib_buffer_t, template_end));
+#if defined CLIB_HAVE_VEC512
+ b->as_u8x64[0] = bt->as_u8x64[0];
+#elif defined (CLIB_HAVE_VEC256)
+ b->as_u8x32[0] = bt->as_u8x32[0];
+ b->as_u8x32[1] = bt->as_u8x32[1];
+#elif defined (CLIB_HAVE_VEC128)
+ b->as_u8x16[0] = bt->as_u8x16[0];
+ b->as_u8x16[1] = bt->as_u8x16[1];
+ b->as_u8x16[2] = bt->as_u8x16[2];
+ b->as_u8x16[3] = bt->as_u8x16[3];
+#else
+ clib_memcpy_fast (b, bt, 64);
+#endif
+}
+
+always_inline u8
+vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node)
+{
+ ASSERT (numa_node < VLIB_BUFFER_MAX_NUMA_NODES);
+ return vm->buffer_main->default_buffer_pool_index_for_numa[numa_node];
}
/** \brief Translate array of buffer indices into buffer pointers with offset
vlib_get_buffers_with_offset (vlib_main_t * vm, u32 * bi, void **b, int count,
i32 offset)
{
+ uword buffer_mem_start = vm->buffer_main->buffer_mem_start;
#ifdef CLIB_HAVE_VEC256
- u64x4 off = u64x4_splat (buffer_main.buffer_mem_start + offset);
+ u64x4 off = u64x4_splat (buffer_mem_start + offset);
/* if count is not const, compiler will not unroll while loop
se we maintain two-in-parallel variant */
while (count >= 8)
/* shift and add to get vlib_buffer_t pointer */
u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
#elif defined (CLIB_HAVE_VEC128)
- u64x2 off = u64x2_splat (buffer_main.buffer_mem_start + offset);
+ u64x2 off = u64x2_splat (buffer_mem_start + offset);
u32x4 bi4 = u32x4_load_unaligned (bi);
u64x2 b0 = u32x4_extend_to_u64x2 ((u32x4) bi4);
#if defined (__aarch64__)
u64x2_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
u64x2_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 2);
#else
- b[0] = ((u8 *) vlib_get_buffer (vm, bi[0])) + offset;
- b[1] = ((u8 *) vlib_get_buffer (vm, bi[1])) + offset;
- b[2] = ((u8 *) vlib_get_buffer (vm, bi[2])) + offset;
- b[3] = ((u8 *) vlib_get_buffer (vm, bi[3])) + offset;
+ b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset);
+ b[1] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[1], offset);
+ b[2] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[2], offset);
+ b[3] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[3], offset);
#endif
b += 4;
bi += 4;
}
while (count)
{
- b[0] = ((u8 *) vlib_get_buffer (vm, bi[0])) + offset;
+ b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset);
b += 1;
bi += 1;
count -= 1;
always_inline u32
vlib_get_buffer_index (vlib_main_t * vm, void *p)
{
- vlib_buffer_main_t *bm = &buffer_main;
+ vlib_buffer_main_t *bm = vm->buffer_main;
uword offset = pointer_to_uword (p) - bm->buffer_mem_start;
ASSERT (pointer_to_uword (p) >= bm->buffer_mem_start);
ASSERT (offset < bm->buffer_mem_size);
{
#ifdef CLIB_HAVE_VEC256
u32x8 mask = { 0, 2, 4, 6, 1, 3, 5, 7 };
- u64x4 off4 = u64x4_splat (buffer_main.buffer_mem_start - offset);
+ u64x4 off4 = u64x4_splat (vm->buffer_main->buffer_mem_start - offset);
while (count >= 8)
{
expected_state);
always_inline vlib_buffer_known_state_t
-vlib_buffer_is_known (u32 buffer_index)
+vlib_buffer_is_known (vlib_main_t * vm, u32 buffer_index)
{
- vlib_buffer_main_t *bm = &buffer_main;
+ vlib_buffer_main_t *bm = vm->buffer_main;
clib_spinlock_lock (&bm->buffer_known_hash_lockp);
uword *p = hash_get (bm->buffer_known_hash, buffer_index);
return p ? p[0] : VLIB_BUFFER_UNKNOWN;
}
-always_inline void
-vlib_buffer_set_known_state (u32 buffer_index,
- vlib_buffer_known_state_t state)
-{
- vlib_buffer_main_t *bm = &buffer_main;
-
- clib_spinlock_lock (&bm->buffer_known_hash_lockp);
- hash_set (bm->buffer_known_hash, buffer_index, state);
- clib_spinlock_unlock (&bm->buffer_known_hash_lockp);
-}
-
/* Validates sanity of a single buffer.
Returns format'ed vector with error message if any. */
u8 *vlib_validate_buffer (vlib_main_t * vm, u32 buffer_index,
uword follow_chain);
-always_inline u32
-vlib_buffer_round_size (u32 size)
+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);
+
+static_always_inline vlib_buffer_pool_t *
+vlib_get_buffer_pool (vlib_main_t * vm, u8 buffer_pool_index)
{
- return round_pow2 (size, sizeof (vlib_buffer_t));
+ vlib_buffer_main_t *bm = vm->buffer_main;
+ return vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
}
-always_inline vlib_buffer_free_list_index_t
-vlib_buffer_get_free_list_index (vlib_buffer_t * b)
+static_always_inline uword
+vlib_buffer_pool_get (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers,
+ u32 n_buffers)
{
- if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NON_DEFAULT_FREELIST))
- return b->free_list_index;
+ vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
+ u32 len;
- return 0;
-}
+ ASSERT (bp->buffers);
-always_inline void
-vlib_buffer_set_free_list_index (vlib_buffer_t * b,
- vlib_buffer_free_list_index_t index)
-{
- if (PREDICT_FALSE (index))
+ clib_spinlock_lock (&bp->lock);
+ len = bp->n_avail;
+ if (PREDICT_TRUE (n_buffers < len))
{
- b->flags |= VLIB_BUFFER_NON_DEFAULT_FREELIST;
- b->free_list_index = index;
+ len -= n_buffers;
+ vlib_buffer_copy_indices (buffers, bp->buffers + len, n_buffers);
+ bp->n_avail = len;
+ clib_spinlock_unlock (&bp->lock);
+ return n_buffers;
}
else
- b->flags &= ~VLIB_BUFFER_NON_DEFAULT_FREELIST;
+ {
+ vlib_buffer_copy_indices (buffers, bp->buffers, len);
+ bp->n_avail = 0;
+ clib_spinlock_unlock (&bp->lock);
+ return len;
+ }
}
-/** \brief Allocate buffers from specific freelist into supplied array
+
+/** \brief Allocate buffers from specific pool into supplied array
@param vm - (vlib_main_t *) vlib main data structure pointer
@param buffers - (u32 * ) buffer index array
@return - (u32) number of buffers actually allocated, may be
less than the number requested or zero
*/
+
always_inline u32
-vlib_buffer_alloc_from_free_list (vlib_main_t * vm,
- u32 * buffers,
- u32 n_buffers,
- vlib_buffer_free_list_index_t index)
+vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
+ u8 buffer_pool_index)
{
- vlib_buffer_main_t *bm = &buffer_main;
- vlib_buffer_free_list_t *fl;
- u32 *src;
- uword len;
+ vlib_buffer_main_t *bm = vm->buffer_main;
+ vlib_buffer_pool_t *bp;
+ vlib_buffer_pool_thread_t *bpt;
+ u32 *src, *dst, len, n_left;
+
+ bp = vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
+ bpt = vec_elt_at_index (bp->threads, vm->thread_index);
- ASSERT (bm->cb.vlib_buffer_fill_free_list_cb);
+ dst = buffers;
+ n_left = n_buffers;
+ len = bpt->n_cached;
- fl = pool_elt_at_index (vm->buffer_free_list_pool, index);
+ /* per-thread cache contains enough buffers */
+ if (len >= n_buffers)
+ {
+ src = bpt->cached_buffers + len - n_buffers;
+ vlib_buffer_copy_indices (dst, src, n_buffers);
+ bpt->n_cached -= n_buffers;
- len = vec_len (fl->buffers);
+ if (CLIB_DEBUG > 0)
+ vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
+ VLIB_BUFFER_KNOWN_FREE);
+ return n_buffers;
+ }
- if (PREDICT_FALSE (len < n_buffers))
+ /* alloc bigger than cache - take buffers directly from main pool */
+ if (n_buffers >= VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ)
{
- bm->cb.vlib_buffer_fill_free_list_cb (vm, fl, n_buffers);
- if (PREDICT_FALSE ((len = vec_len (fl->buffers)) == 0))
- return 0;
+ n_buffers = vlib_buffer_pool_get (vm, buffer_pool_index, buffers,
+ n_buffers);
- /* even if fill free list didn't manage to refill free list
- we should give what we have */
- n_buffers = clib_min (len, n_buffers);
+ if (CLIB_DEBUG > 0)
+ vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
+ VLIB_BUFFER_KNOWN_FREE);
+ return n_buffers;
+ }
- /* following code is intentionaly duplicated to allow compiler
- to optimize fast path when n_buffers is constant value */
- src = fl->buffers + len - n_buffers;
- vlib_buffer_copy_indices (buffers, src, n_buffers);
- _vec_len (fl->buffers) -= n_buffers;
+ /* take everything available in the cache */
+ if (len)
+ {
+ vlib_buffer_copy_indices (dst, bpt->cached_buffers, len);
+ bpt->n_cached = 0;
+ dst += len;
+ n_left -= len;
+ }
- /* Verify that buffers are known free. */
- vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
- VLIB_BUFFER_KNOWN_FREE);
+ len = round_pow2 (n_left, 32);
+ len = vlib_buffer_pool_get (vm, buffer_pool_index, bpt->cached_buffers,
+ len);
+ bpt->n_cached = len;
- return n_buffers;
+ if (len)
+ {
+ u32 n_copy = clib_min (len, n_left);
+ src = bpt->cached_buffers + len - n_copy;
+ vlib_buffer_copy_indices (dst, src, n_copy);
+ bpt->n_cached -= n_copy;
+ n_left -= n_copy;
}
- src = fl->buffers + len - n_buffers;
- vlib_buffer_copy_indices (buffers, src, n_buffers);
- _vec_len (fl->buffers) -= n_buffers;
+ n_buffers -= n_left;
/* Verify that buffers are known free. */
- vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
- VLIB_BUFFER_KNOWN_FREE);
+ if (CLIB_DEBUG > 0)
+ vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
+ VLIB_BUFFER_KNOWN_FREE);
return n_buffers;
}
+/** \brief Allocate buffers from specific numa node into supplied array
+
+ @param vm - (vlib_main_t *) vlib main data structure pointer
+ @param buffers - (u32 * ) buffer index array
+ @param n_buffers - (u32) number of buffers requested
+ @param numa_node - (u32) numa node
+ @return - (u32) number of buffers actually allocated, may be
+ less than the number requested or zero
+*/
+always_inline u32
+vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
+ u32 numa_node)
+{
+ u8 index = vlib_buffer_pool_get_default_for_numa (vm, numa_node);
+ return vlib_buffer_alloc_from_pool (vm, buffers, n_buffers, index);
+}
+
/** \brief Allocate buffers into supplied array
@param vm - (vlib_main_t *) vlib main data structure pointer
@return - (u32) number of buffers actually allocated, may be
less than the number requested or zero
*/
+
always_inline u32
vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
{
- return vlib_buffer_alloc_from_free_list (vm, buffers, n_buffers,
- VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+ return vlib_buffer_alloc_on_numa (vm, buffers, n_buffers, vm->numa_node);
}
/** \brief Allocate buffers into ring
return n_alloc;
}
+/** \brief Allocate buffers into ring from specific buffer pool
+
+ @param vm - (vlib_main_t *) vlib main data structure pointer
+ @param buffers - (u32 * ) buffer index ring
+ @param start - (u32) first slot in the ring
+ @param ring_size - (u32) ring size
+ @param n_buffers - (u32) number of buffers requested
+ @return - (u32) number of buffers actually allocated, may be
+ less than the number requested or zero
+*/
+always_inline u32
+vlib_buffer_alloc_to_ring_from_pool (vlib_main_t * vm, u32 * ring, u32 start,
+ u32 ring_size, u32 n_buffers,
+ u8 buffer_pool_index)
+{
+ u32 n_alloc;
+
+ ASSERT (n_buffers <= ring_size);
+
+ if (PREDICT_TRUE (start + n_buffers <= ring_size))
+ return vlib_buffer_alloc_from_pool (vm, ring + start, n_buffers,
+ buffer_pool_index);
+
+ n_alloc = vlib_buffer_alloc_from_pool (vm, ring + start, ring_size - start,
+ buffer_pool_index);
+
+ if (PREDICT_TRUE (n_alloc == ring_size - start))
+ n_alloc += vlib_buffer_alloc_from_pool (vm, ring, n_buffers - n_alloc,
+ buffer_pool_index);
+
+ return n_alloc;
+}
+
+static_always_inline void
+vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index,
+ u32 * buffers, u32 n_buffers)
+{
+ vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index);
+ vlib_buffer_pool_thread_t *bpt = vec_elt_at_index (bp->threads,
+ vm->thread_index);
+ u32 n_cached, n_empty;
+
+ if (CLIB_DEBUG > 0)
+ vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
+ VLIB_BUFFER_KNOWN_ALLOCATED);
+
+ n_cached = bpt->n_cached;
+ n_empty = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ - n_cached;
+ if (n_buffers <= n_empty)
+ {
+ vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
+ buffers, n_buffers);
+ bpt->n_cached = n_cached + n_buffers;
+ return;
+ }
+
+ vlib_buffer_copy_indices (bpt->cached_buffers + n_cached,
+ buffers + n_buffers - n_empty, n_empty);
+ bpt->n_cached = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ;
+
+ clib_spinlock_lock (&bp->lock);
+ vlib_buffer_copy_indices (bp->buffers + bp->n_avail, buffers,
+ n_buffers - n_empty);
+ bp->n_avail += n_buffers - n_empty;
+ clib_spinlock_unlock (&bp->lock);
+}
+
+static_always_inline void
+vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
+ int maybe_next)
+{
+ const int queue_size = 128;
+ vlib_buffer_pool_t *bp = 0;
+ u8 buffer_pool_index = ~0;
+ u32 n_queue = 0, queue[queue_size + 4];
+ vlib_buffer_t bt = { };
+#if defined(CLIB_HAVE_VEC128)
+ vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 };
+ vlib_buffer_t bpi_vec = {.buffer_pool_index = ~0 };
+ vlib_buffer_t flags_refs_mask = {
+ .flags = VLIB_BUFFER_NEXT_PRESENT,
+ .ref_count = ~1
+ };
+#endif
+
+ while (n_buffers)
+ {
+ vlib_buffer_t *b[8];
+ u32 bi, sum = 0, flags, next;
+
+ if (n_buffers < 12)
+ goto one_by_one;
+
+ vlib_get_buffers (vm, buffers, b, 4);
+ vlib_get_buffers (vm, buffers + 8, b + 4, 4);
+
+ vlib_prefetch_buffer_header (b[4], LOAD);
+ vlib_prefetch_buffer_header (b[5], LOAD);
+ vlib_prefetch_buffer_header (b[6], LOAD);
+ vlib_prefetch_buffer_header (b[7], LOAD);
+
+#if defined(CLIB_HAVE_VEC128)
+ u8x16 p0, p1, p2, p3, r;
+ p0 = u8x16_load_unaligned (b[0]);
+ p1 = u8x16_load_unaligned (b[1]);
+ p2 = u8x16_load_unaligned (b[2]);
+ p3 = u8x16_load_unaligned (b[3]);
+
+ r = p0 ^ bpi_vec.as_u8x16[0];
+ r |= p1 ^ bpi_vec.as_u8x16[0];
+ r |= p2 ^ bpi_vec.as_u8x16[0];
+ r |= p3 ^ bpi_vec.as_u8x16[0];
+ r &= bpi_mask.as_u8x16[0];
+ r |= (p0 | p1 | p2 | p3) & flags_refs_mask.as_u8x16[0];
+
+ sum = !u8x16_is_all_zero (r);
+#else
+ sum |= b[0]->flags;
+ sum |= b[1]->flags;
+ sum |= b[2]->flags;
+ sum |= b[3]->flags;
+ sum &= VLIB_BUFFER_NEXT_PRESENT;
+ sum += b[0]->ref_count - 1;
+ sum += b[1]->ref_count - 1;
+ sum += b[2]->ref_count - 1;
+ sum += b[3]->ref_count - 1;
+ sum |= b[0]->buffer_pool_index ^ buffer_pool_index;
+ sum |= b[1]->buffer_pool_index ^ buffer_pool_index;
+ sum |= b[2]->buffer_pool_index ^ buffer_pool_index;
+ sum |= b[3]->buffer_pool_index ^ buffer_pool_index;
+#endif
+
+ if (sum)
+ goto one_by_one;
+
+ vlib_buffer_copy_indices (queue + n_queue, buffers, 4);
+ vlib_buffer_copy_template (b[0], &bt);
+ vlib_buffer_copy_template (b[1], &bt);
+ vlib_buffer_copy_template (b[2], &bt);
+ vlib_buffer_copy_template (b[3], &bt);
+ n_queue += 4;
+
+ vlib_buffer_validate (vm, b[0]);
+ vlib_buffer_validate (vm, b[1]);
+ vlib_buffer_validate (vm, b[2]);
+ vlib_buffer_validate (vm, b[3]);
+
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
+
+ if (n_queue >= queue_size)
+ {
+ vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
+ n_queue = 0;
+ }
+ buffers += 4;
+ n_buffers -= 4;
+ continue;
+
+ one_by_one:
+ bi = buffers[0];
+
+ next_in_chain:
+ b[0] = vlib_get_buffer (vm, bi);
+ flags = b[0]->flags;
+ next = b[0]->next_buffer;
+
+ if (PREDICT_FALSE (buffer_pool_index != b[0]->buffer_pool_index))
+ {
+
+ if (n_queue)
+ {
+ vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
+ n_queue = 0;
+ }
+
+ buffer_pool_index = b[0]->buffer_pool_index;
+#if defined(CLIB_HAVE_VEC128)
+ bpi_vec.buffer_pool_index = buffer_pool_index;
+#endif
+ bp = vlib_get_buffer_pool (vm, buffer_pool_index);
+ vlib_buffer_copy_template (&bt, &bp->buffer_template);
+ }
+
+ vlib_buffer_validate (vm, b[0]);
+
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
+
+ if (clib_atomic_sub_fetch (&b[0]->ref_count, 1) == 0)
+ {
+ vlib_buffer_copy_template (b[0], &bt);
+ queue[n_queue++] = bi;
+ }
+
+ if (n_queue == queue_size)
+ {
+ vlib_buffer_pool_put (vm, buffer_pool_index, queue, queue_size);
+ n_queue = 0;
+ }
+
+ if (maybe_next && (flags & VLIB_BUFFER_NEXT_PRESENT))
+ {
+ bi = next;
+ goto next_in_chain;
+ }
+
+ buffers++;
+ n_buffers--;
+ }
+
+ if (n_queue)
+ vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
+}
+
+
/** \brief Free buffers
Frees the entire buffer chain for each buffer
/* number of buffers to free */
u32 n_buffers)
{
- vlib_buffer_main_t *bm = &buffer_main;
-
- ASSERT (bm->cb.vlib_buffer_free_cb);
-
- return bm->cb.vlib_buffer_free_cb (vm, buffers, n_buffers);
+ vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 1);
}
/** \brief Free buffers, does not free the buffer chain for each buffer
/* number of buffers to free */
u32 n_buffers)
{
- vlib_buffer_main_t *bm = &buffer_main;
-
- ASSERT (bm->cb.vlib_buffer_free_no_next_cb);
-
- return bm->cb.vlib_buffer_free_no_next_cb (vm, buffers, n_buffers);
+ vlib_buffer_free_inline (vm, buffers, n_buffers, /* maybe next */ 0);
}
/** \brief Free one buffer
always_inline void
vlib_buffer_free_one (vlib_main_t * vm, u32 buffer_index)
{
- vlib_buffer_free (vm, &buffer_index, /* n_buffers */ 1);
+ vlib_buffer_free_inline (vm, &buffer_index, 1, /* maybe next */ 1);
}
/** \brief Free buffers from ring
}
}
-/* Add/delete buffer free lists. */
-vlib_buffer_free_list_index_t vlib_buffer_create_free_list (vlib_main_t * vm,
- u32 n_data_bytes,
- char *fmt, ...);
-always_inline void
-vlib_buffer_delete_free_list (vlib_main_t * vm,
- vlib_buffer_free_list_index_t free_list_index)
-{
- vlib_buffer_main_t *bm = &buffer_main;
-
- ASSERT (bm->cb.vlib_buffer_delete_free_list_cb);
-
- bm->cb.vlib_buffer_delete_free_list_cb (vm, free_list_index);
-}
-
-/* Make sure we have at least given number of unaligned buffers. */
-void vlib_buffer_free_list_fill_unaligned (vlib_main_t * vm,
- vlib_buffer_free_list_t *
- free_list,
- uword n_unaligned_buffers);
-
-always_inline vlib_buffer_free_list_t *
-vlib_buffer_get_buffer_free_list (vlib_main_t * vm, vlib_buffer_t * b,
- vlib_buffer_free_list_index_t * index)
-{
- vlib_buffer_free_list_index_t i;
-
- *index = i = vlib_buffer_get_free_list_index (b);
- return pool_elt_at_index (vm->buffer_free_list_pool, i);
-}
-
-always_inline vlib_buffer_free_list_t *
-vlib_buffer_get_free_list (vlib_main_t * vm,
- vlib_buffer_free_list_index_t free_list_index)
-{
- vlib_buffer_free_list_t *f;
-
- f = pool_elt_at_index (vm->buffer_free_list_pool, free_list_index);
-
- /* Sanity: indices must match. */
- ASSERT (f->index == free_list_index);
-
- return f;
-}
-
-always_inline u32
-vlib_buffer_free_list_buffer_size (vlib_main_t * vm,
- vlib_buffer_free_list_index_t index)
-{
- vlib_buffer_free_list_t *f = vlib_buffer_get_free_list (vm, index);
- return f->n_data_bytes;
-}
-
/* 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);
+/* Define vlib_buffer and vnet_buffer flags bits preserved for copy/clone */
+#define VLIB_BUFFER_COPY_CLONE_FLAGS_MASK \
+ (VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID | \
+ VLIB_BUFFER_IS_TRACED | ~VLIB_BUFFER_FLAGS_ALL)
+
/* duplicate all buffers in chain */
always_inline vlib_buffer_t *
vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
{
vlib_buffer_t *s, *d, *fd;
uword n_alloc, n_buffers = 1;
- u32 flag_mask = VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID;
+ u32 flag_mask = VLIB_BUFFER_COPY_CLONE_FLAGS_MASK;
int i;
s = b;
d->current_data = s->current_data;
d->current_length = s->current_length;
d->flags = s->flags & flag_mask;
+ d->trace_handle = s->trace_handle;
d->total_length_not_including_first_buffer =
s->total_length_not_including_first_buffer;
clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
return fd;
}
+/* duplicate first buffer in chain */
+always_inline vlib_buffer_t *
+vlib_buffer_copy_no_chain (vlib_main_t * vm, vlib_buffer_t * b, u32 * di)
+{
+ vlib_buffer_t *d;
+
+ if ((vlib_buffer_alloc (vm, di, 1)) != 1)
+ return 0;
+
+ d = vlib_get_buffer (vm, *di);
+ /* 1st segment */
+ d->current_data = b->current_data;
+ d->current_length = b->current_length;
+ clib_memcpy_fast (d->opaque, b->opaque, sizeof (b->opaque));
+ clib_memcpy_fast (d->opaque2, b->opaque2, sizeof (b->opaque2));
+ clib_memcpy_fast (vlib_buffer_get_current (d),
+ vlib_buffer_get_current (b), b->current_length);
+
+ return d;
+}
+
+/* \brief Move packet from current position to offset position in buffer.
+ Only work for small packet using one buffer with room to fit the move
+ @param vm - (vlib_main_t *) vlib main data structure pointer
+ @param b - (vlib_buffer_t *) pointer to buffer
+ @param offset - (i16) position to move the packet in buffer
+ */
+always_inline void
+vlib_buffer_move (vlib_main_t * vm, vlib_buffer_t * b, i16 offset)
+{
+ ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
+ ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
+ ASSERT (offset + b->current_length <
+ vlib_buffer_get_default_data_size (vm));
+
+ u8 *source = vlib_buffer_get_current (b);
+ b->current_data = offset;
+ u8 *destination = vlib_buffer_get_current (b);
+ u16 length = b->current_length;
+
+ if (source + length <= destination) /* no overlap */
+ clib_memcpy_fast (destination, source, length);
+ else
+ memmove (destination, source, length);
+}
+
/** \brief Create a maximum of 256 clones of buffer and store them
in the supplied array
@param n_buffers - (u16) number of buffer clones requested (<=256)
@param head_end_offset - (u16) offset relative to current position
where packet head ends
+ @param offset - (i16) copy packet head at current position if 0,
+ else at offset position to change headroom space as specified
@return - (u16) number of buffers actually cloned, may be
less than the number requested or zero
*/
always_inline u16
vlib_buffer_clone_256 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
- u16 n_buffers, u16 head_end_offset)
+ u16 n_buffers, u16 head_end_offset, i16 offset)
{
u16 i;
vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
- ASSERT (s->n_add_refs == 0);
+ ASSERT (s->ref_count == 1);
ASSERT (n_buffers);
ASSERT (n_buffers <= 256);
+ ASSERT (offset + VLIB_BUFFER_PRE_DATA_SIZE >= 0);
+ ASSERT ((offset + head_end_offset) <
+ vlib_buffer_get_default_data_size (vm));
if (s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2)
{
buffers[0] = src_buffer;
+ if (offset)
+ vlib_buffer_move (vm, s, offset);
+
for (i = 1; i < n_buffers; i++)
{
vlib_buffer_t *d;
return n_buffers;
}
- if (PREDICT_FALSE (n_buffers == 1))
+ if (PREDICT_FALSE ((n_buffers == 1) && (offset == 0)))
{
buffers[0] = src_buffer;
return 1;
}
- n_buffers = vlib_buffer_alloc_from_free_list (vm, buffers, n_buffers,
- vlib_buffer_get_free_list_index
- (s));
+ n_buffers = vlib_buffer_alloc_from_pool (vm, buffers, n_buffers,
+ s->buffer_pool_index);
for (i = 0; i < n_buffers; i++)
{
vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
- d->current_data = s->current_data;
+ if (offset)
+ d->current_data = offset;
+ else
+ d->current_data = s->current_data;
+
d->current_length = head_end_offset;
- vlib_buffer_set_free_list_index (d,
- vlib_buffer_get_free_list_index (s));
+ ASSERT (d->buffer_pool_index == s->buffer_pool_index);
d->total_length_not_including_first_buffer = s->current_length -
head_end_offset;
d->total_length_not_including_first_buffer +=
s->total_length_not_including_first_buffer;
}
- d->flags = s->flags | VLIB_BUFFER_NEXT_PRESENT;
- d->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
+ d->flags = (s->flags & VLIB_BUFFER_COPY_CLONE_FLAGS_MASK) |
+ VLIB_BUFFER_NEXT_PRESENT;
+ d->trace_handle = s->trace_handle;
clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
clib_memcpy_fast (vlib_buffer_get_current (d),
d->next_buffer = src_buffer;
}
vlib_buffer_advance (s, head_end_offset);
- s->n_add_refs = n_buffers - 1;
+ s->ref_count = n_buffers;
while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
{
s = vlib_get_buffer (vm, s->next_buffer);
- s->n_add_refs = n_buffers - 1;
+ s->ref_count = n_buffers;
}
return n_buffers;
@param n_buffers - (u16) number of buffer clones requested (<=256)
@param head_end_offset - (u16) offset relative to current position
where packet head ends
+ @param offset - (i16) copy packet head at current position if 0,
+ else at offset position to change headroom space as specified
@return - (u16) number of buffers actually cloned, may be
less than the number requested or zero
*/
always_inline u16
-vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
- u16 n_buffers, u16 head_end_offset)
+vlib_buffer_clone_at_offset (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
+ u16 n_buffers, u16 head_end_offset, i16 offset)
{
vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);
u16 n_cloned = 0;
n_cloned += vlib_buffer_clone_256 (vm,
vlib_get_buffer_index (vm, copy),
(buffers + n_cloned),
- 256, head_end_offset);
+ 256, head_end_offset, offset);
n_buffers -= 256;
}
n_cloned += vlib_buffer_clone_256 (vm, src_buffer,
buffers + n_cloned,
- n_buffers, head_end_offset);
+ n_buffers, head_end_offset, offset);
return n_cloned;
}
+/** \brief Create multiple clones of buffer and store them
+ in the supplied array
+
+ @param vm - (vlib_main_t *) vlib main data structure pointer
+ @param src_buffer - (u32) source buffer index
+ @param buffers - (u32 * ) buffer index array
+ @param n_buffers - (u16) number of buffer clones requested (<=256)
+ @param head_end_offset - (u16) offset relative to current position
+ where packet head ends
+ @return - (u16) number of buffers actually cloned, may be
+ less than the number requested or zero
+*/
+always_inline u16
+vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
+ u16 n_buffers, u16 head_end_offset)
+{
+ return vlib_buffer_clone_at_offset (vm, src_buffer, buffers, n_buffers,
+ head_end_offset, 0);
+}
+
/** \brief Attach cloned tail to the buffer
@param vm - (vlib_main_t *) vlib main data structure pointer
vlib_buffer_t * tail)
{
ASSERT ((head->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
- ASSERT (vlib_buffer_get_free_list_index (head) ==
- vlib_buffer_get_free_list_index (tail));
+ ASSERT (head->buffer_pool_index == tail->buffer_pool_index);
head->flags |= VLIB_BUFFER_NEXT_PRESENT;
head->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
tail->total_length_not_including_first_buffer;
next_segment:
- clib_atomic_add_fetch (&tail->n_add_refs, 1);
+ clib_atomic_add_fetch (&tail->ref_count, 1);
if (tail->flags & VLIB_BUFFER_NEXT_PRESENT)
{
* Returns the number of copied bytes. */
always_inline u16
vlib_buffer_chain_append_data (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)
{
- u32 n_buffer_bytes =
- vlib_buffer_free_list_buffer_size (vm, free_list_index);
+ u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
ASSERT (n_buffer_bytes >= last->current_length + last->current_data);
u16 len = clib_min (data_len,
n_buffer_bytes - last->current_length -
* chained and points to the last buffer in the chain. */
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);
void vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * first);
format_function_t format_vlib_buffer, format_vlib_buffer_and_data,
- format_vlib_buffer_contents;
+ format_vlib_buffer_contents, format_vlib_buffer_no_chain;
typedef struct
{
/* Number of buffers to allocate in each call to allocator. */
u32 min_n_buffers_each_alloc;
- /* Buffer free list for this template. */
- vlib_buffer_free_list_index_t free_list_index;
-
- u32 *free_buffers;
-
u8 *name;
} vlib_packet_template_t;
-void vlib_packet_template_get_packet_helper (vlib_main_t * vm,
- vlib_packet_template_t * t);
-
void vlib_packet_template_init (vlib_main_t * vm,
vlib_packet_template_t * t,
void *packet_data,
vec_free (t->packet_data);
}
-/* Set a buffer quickly into "uninitialized" state. We want this to
- be extremely cheap and arrange for all fields that need to be
- initialized to be in the first 128 bits of the buffer. */
-always_inline void
-vlib_buffer_init_for_free_list (vlib_buffer_t * dst,
- vlib_buffer_free_list_t * fl)
-{
- vlib_buffer_t *src = &fl->buffer_init_template;
-
- /* Make sure vlib_buffer_t is cacheline aligned and sized */
- ASSERT (STRUCT_OFFSET_OF (vlib_buffer_t, cacheline0) == 0);
- ASSERT (STRUCT_OFFSET_OF (vlib_buffer_t, cacheline1) ==
- CLIB_CACHE_LINE_BYTES);
- ASSERT (STRUCT_OFFSET_OF (vlib_buffer_t, cacheline2) ==
- CLIB_CACHE_LINE_BYTES * 2);
-
- /* Make sure buffer template is sane. */
- vlib_buffer_copy_template (dst, src);
-
- /* Not in the first 16 octets. */
- dst->n_add_refs = src->n_add_refs;
- vlib_buffer_set_free_list_index (dst, fl->index);
-
- /* Make sure it really worked. */
-#define _(f) ASSERT (dst->f == src->f);
- _(current_data);
- _(current_length);
- _(flags);
-#undef _
- /* ASSERT (dst->total_length_not_including_first_buffer == 0); */
- /* total_length_not_including_first_buffer is not in the template anymore
- * so it may actually not zeroed for some buffers. One option is to
- * uncomment the line lower (comes at a cost), the other, is to just not
- * care */
- /* dst->total_length_not_including_first_buffer = 0; */
- ASSERT (dst->n_add_refs == 0);
-}
-
-always_inline void
-vlib_buffer_add_to_free_list (vlib_main_t * vm,
- vlib_buffer_free_list_t * f,
- u32 buffer_index, u8 do_init)
+always_inline u32
+vlib_buffer_space_left_at_end (vlib_main_t * vm, vlib_buffer_t * b)
{
- vlib_buffer_pool_t *bp = vlib_buffer_pool_get (f->buffer_pool_index);
- vlib_buffer_t *b;
- b = vlib_get_buffer (vm, buffer_index);
- if (PREDICT_TRUE (do_init))
- vlib_buffer_init_for_free_list (b, f);
- vec_add1_aligned (f->buffers, buffer_index, CLIB_CACHE_LINE_BYTES);
-
- if (vec_len (f->buffers) > 4 * VLIB_FRAME_SIZE)
- {
- clib_spinlock_lock (&bp->lock);
- /* keep last stored buffers, as they are more likely hot in the cache */
- vec_add_aligned (bp->buffers, f->buffers, VLIB_FRAME_SIZE,
- CLIB_CACHE_LINE_BYTES);
- vec_delete (f->buffers, VLIB_FRAME_SIZE, 0);
- f->n_alloc -= VLIB_FRAME_SIZE;
- clib_spinlock_unlock (&bp->lock);
- }
+ return b->data + vlib_buffer_get_default_data_size (vm) -
+ ((u8 *) vlib_buffer_get_current (b) + b->current_length);
}
-#if CLIB_DEBUG > 0
-extern u32 *vlib_buffer_state_validation_lock;
-extern uword *vlib_buffer_state_validation_hash;
-extern void *vlib_buffer_state_heap;
-#endif
-
-static inline void
-vlib_validate_buffer_in_use (vlib_buffer_t * b, u32 expected)
+always_inline u32
+vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * b)
{
-#if CLIB_DEBUG > 0
- uword *p;
- void *oldheap;
+ vlib_buffer_t *db = b, *sb, *first = b;
+ int is_cloned = 0;
+ u32 bytes_left = 0, data_size;
+ u16 src_left, dst_left, n_buffers = 1;
+ u8 *dp, *sp;
+ u32 to_free = 0;
- oldheap = clib_mem_set_heap (vlib_buffer_state_heap);
+ if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
+ return 1;
- while (clib_atomic_test_and_set (vlib_buffer_state_validation_lock))
- ;
+ data_size = vlib_buffer_get_default_data_size (vm);
- p = hash_get (vlib_buffer_state_validation_hash, b);
+ dst_left = vlib_buffer_space_left_at_end (vm, b);
- /* If we don't know about b, declare it to be in the expected state */
- if (!p)
+ while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
- hash_set (vlib_buffer_state_validation_hash, b, expected);
- goto out;
+ b = vlib_get_buffer (vm, b->next_buffer);
+ if (b->ref_count > 1)
+ is_cloned = 1;
+ bytes_left += b->current_length;
+ n_buffers++;
}
- if (p[0] != expected)
+ /* if buffer is cloned, create completely new chain - unless everything fits
+ * into one buffer */
+ if (is_cloned && bytes_left >= dst_left)
{
- void cj_stop (void);
- u32 bi;
- vlib_main_t *vm = &vlib_global_main;
+ u32 len = 0;
+ u32 space_needed = bytes_left - dst_left;
+ u32 tail;
- cj_stop ();
+ if (vlib_buffer_alloc (vm, &tail, 1) == 0)
+ return 0;
- bi = vlib_get_buffer_index (vm, b);
+ ++n_buffers;
+ len += data_size;
+ b = vlib_get_buffer (vm, tail);
- clib_mem_set_heap (oldheap);
- clib_warning ("%.6f buffer %llx (%d): %s, not %s",
- vlib_time_now (vm), bi,
- p[0] ? "busy" : "free", expected ? "busy" : "free");
- os_panic ();
+ while (len < space_needed)
+ {
+ u32 bi;
+ if (vlib_buffer_alloc (vm, &bi, 1) == 0)
+ {
+ vlib_buffer_free_one (vm, tail);
+ return 0;
+ }
+ b->flags = VLIB_BUFFER_NEXT_PRESENT;
+ b->next_buffer = bi;
+ b = vlib_get_buffer (vm, bi);
+ len += data_size;
+ n_buffers++;
+ }
+ sb = vlib_get_buffer (vm, first->next_buffer);
+ to_free = first->next_buffer;
+ first->next_buffer = tail;
}
-out:
- CLIB_MEMORY_BARRIER ();
- *vlib_buffer_state_validation_lock = 0;
- clib_mem_set_heap (oldheap);
-#endif
-}
-
-static inline void
-vlib_validate_buffer_set_in_use (vlib_buffer_t * b, u32 expected)
-{
-#if CLIB_DEBUG > 0
- void *oldheap;
-
- oldheap = clib_mem_set_heap (vlib_buffer_state_heap);
-
- while (clib_atomic_test_and_set (vlib_buffer_state_validation_lock))
- ;
-
- hash_set (vlib_buffer_state_validation_hash, b, expected);
-
- CLIB_MEMORY_BARRIER ();
- *vlib_buffer_state_validation_lock = 0;
- clib_mem_set_heap (oldheap);
-#endif
-}
+ else
+ sb = vlib_get_buffer (vm, first->next_buffer);
-/** minimum data size of first buffer in a buffer chain */
-#define VLIB_BUFFER_CHAIN_MIN_FIRST_DATA_SIZE (256)
+ src_left = sb->current_length;
+ sp = vlib_buffer_get_current (sb);
+ dp = vlib_buffer_get_tail (db);
-/**
- * @brief compress buffer chain in a way where the first buffer is at least
- * VLIB_BUFFER_CHAIN_MIN_FIRST_DATA_SIZE long
- *
- * @param[in] vm - vlib_main
- * @param[in,out] first - first buffer in chain
- * @param[in,out] discard_vector - vector of buffer indexes which were removed
- * from the chain
- */
-always_inline void
-vlib_buffer_chain_compress (vlib_main_t * vm,
- vlib_buffer_t * first, u32 ** discard_vector)
-{
- if (first->current_length >= VLIB_BUFFER_CHAIN_MIN_FIRST_DATA_SIZE ||
- !(first->flags & VLIB_BUFFER_NEXT_PRESENT))
+ while (bytes_left)
{
- /* this is already big enough or not a chain */
- return;
- }
- /* probe free list to find allocated buffer size to avoid overfill */
- vlib_buffer_free_list_index_t index;
- vlib_buffer_free_list_t *free_list =
- vlib_buffer_get_buffer_free_list (vm, first, &index);
-
- u32 want_first_size = clib_min (VLIB_BUFFER_CHAIN_MIN_FIRST_DATA_SIZE,
- free_list->n_data_bytes -
- first->current_data);
- do
- {
- vlib_buffer_t *second = vlib_get_buffer (vm, first->next_buffer);
- u32 need = want_first_size - first->current_length;
- u32 amount_to_copy = clib_min (need, second->current_length);
- clib_memcpy_fast (((u8 *) vlib_buffer_get_current (first)) +
- first->current_length,
- vlib_buffer_get_current (second), amount_to_copy);
- first->current_length += amount_to_copy;
- second->current_data += amount_to_copy;
- second->current_length -= amount_to_copy;
- if (first->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)
- {
- first->total_length_not_including_first_buffer -= amount_to_copy;
- }
- if (!second->current_length)
+ u16 bytes_to_copy;
+
+ if (dst_left == 0)
{
- vec_add1 (*discard_vector, first->next_buffer);
- if (second->flags & VLIB_BUFFER_NEXT_PRESENT)
+ db->current_length = dp - (u8 *) vlib_buffer_get_current (db);
+ ASSERT (db->flags & VLIB_BUFFER_NEXT_PRESENT);
+ db = vlib_get_buffer (vm, db->next_buffer);
+ dst_left = data_size;
+ if (db->current_data > 0)
{
- first->next_buffer = second->next_buffer;
+ db->current_data = 0;
}
else
{
- first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
+ dst_left += -db->current_data;
}
- second->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
+ dp = vlib_buffer_get_current (db);
}
- }
- while ((first->current_length < want_first_size) &&
- (first->flags & VLIB_BUFFER_NEXT_PRESENT));
-}
-/**
- * @brief linearize buffer chain - the first buffer is filled, if needed,
- * buffers are allocated and filled, returns free space in last buffer or
- * negative on failure
- *
- * @param[in] vm - vlib_main
- * @param[in,out] first - first buffer in chain
- */
-always_inline int
-vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * first)
-{
- vlib_buffer_t *b = first;
- vlib_buffer_free_list_t *fl =
- vlib_buffer_get_free_list (vm, vlib_buffer_get_free_list_index (b));
- u32 buf_len = fl->n_data_bytes;
- // free buffer chain starting from the second buffer
- int free_count = (b->flags & VLIB_BUFFER_NEXT_PRESENT) != 0;
- u32 chain_to_free = b->next_buffer;
-
- u32 len = vlib_buffer_length_in_chain (vm, b);
- u32 free_len = buf_len - b->current_data - b->current_length;
- int alloc_len = clib_max (len - free_len, 0); //use the free len in the first buffer
- int n_buffers = (alloc_len + buf_len - 1) / buf_len;
- u32 new_buffers[n_buffers];
+ while (src_left == 0)
+ {
+ ASSERT (sb->flags & VLIB_BUFFER_NEXT_PRESENT);
+ sb = vlib_get_buffer (vm, sb->next_buffer);
+ src_left = sb->current_length;
+ sp = vlib_buffer_get_current (sb);
+ }
- u32 n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
- if (n_alloc != n_buffers)
- {
- vlib_buffer_free_no_next (vm, new_buffers, n_alloc);
- return -1;
+ bytes_to_copy = clib_min (dst_left, src_left);
+
+ if (dp != sp)
+ {
+ if (sb == db)
+ bytes_to_copy = clib_min (bytes_to_copy, sp - dp);
+
+ clib_memcpy_fast (dp, sp, bytes_to_copy);
+ }
+
+ src_left -= bytes_to_copy;
+ dst_left -= bytes_to_copy;
+ dp += bytes_to_copy;
+ sp += bytes_to_copy;
+ bytes_left -= bytes_to_copy;
}
+ if (db != first)
+ db->current_data = 0;
+ db->current_length = dp - (u8 *) vlib_buffer_get_current (db);
- vlib_buffer_t *s = b;
- while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
+ if (is_cloned && to_free)
+ vlib_buffer_free_one (vm, to_free);
+ else
{
- s = vlib_get_buffer (vm, s->next_buffer);
- int d_free_len = buf_len - b->current_data - b->current_length;
- ASSERT (d_free_len >= 0);
- // chain buf and split write
- u32 copy_len = clib_min (d_free_len, s->current_length);
- u8 *d = vlib_buffer_put_uninit (b, copy_len);
- clib_memcpy (d, vlib_buffer_get_current (s), copy_len);
- int rest = s->current_length - copy_len;
- if (rest > 0)
+ if (db->flags & VLIB_BUFFER_NEXT_PRESENT)
+ vlib_buffer_free_one (vm, db->next_buffer);
+ db->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
+ b = first;
+ n_buffers = 1;
+ while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
- //prev buf is full
- ASSERT (vlib_buffer_get_tail (b) == b->data + buf_len);
- ASSERT (n_buffers > 0);
- b = vlib_buffer_chain_buffer (vm, b, new_buffers[--n_buffers]);
- //make full use of the new buffers
- b->current_data = 0;
- d = vlib_buffer_put_uninit (b, rest);
- clib_memcpy (d, vlib_buffer_get_current (s) + copy_len, rest);
+ b = vlib_get_buffer (vm, b->next_buffer);
+ ++n_buffers;
}
}
- vlib_buffer_free (vm, &chain_to_free, free_count);
- b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
- if (b == first) /* no buffers addeed */
- b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
- ASSERT (len == vlib_buffer_length_in_chain (vm, first));
- ASSERT (n_buffers == 0);
- return buf_len - b->current_data - b->current_length;
+
+ first->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
+
+ return n_buffers;
}
#endif /* included_vlib_buffer_funcs_h */
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