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-rw-r--r--src/vlib/buffer_funcs.h80
1 files changed, 59 insertions, 21 deletions
diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h
index c7b5321ffac..08f5b3e9010 100644
--- a/src/vlib/buffer_funcs.h
+++ b/src/vlib/buffer_funcs.h
@@ -218,6 +218,11 @@ typedef enum
VLIB_BUFFER_KNOWN_ALLOCATED,
} vlib_buffer_known_state_t;
+void vlib_buffer_validate_alloc_free (vlib_main_t * vm, u32 * buffers,
+ uword n_buffers,
+ vlib_buffer_known_state_t
+ expected_state);
+
always_inline vlib_buffer_known_state_t
vlib_buffer_is_known (vlib_main_t * vm, u32 buffer_index)
{
@@ -245,24 +250,6 @@ vlib_buffer_set_known_state (vlib_main_t * vm,
u8 *vlib_validate_buffer (vlib_main_t * vm, u32 buffer_index,
uword follow_chain);
-/** \brief Allocate buffers 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
- @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)
-{
- vlib_buffer_main_t *bm = vm->buffer_main;
-
- ASSERT (bm->cb.vlib_buffer_alloc_cb);
-
- return bm->cb.vlib_buffer_alloc_cb (vm, buffers, n_buffers);
-}
-
always_inline u32
vlib_buffer_round_size (u32 size)
{
@@ -301,11 +288,62 @@ vlib_buffer_alloc_from_free_list (vlib_main_t * vm,
u32 n_buffers, u32 free_list_index)
{
vlib_buffer_main_t *bm = vm->buffer_main;
+ vlib_buffer_free_list_t *fl;
+ u32 *src;
+ uword len;
+
+ ASSERT (bm->cb.vlib_buffer_fill_free_list_cb);
+
+ fl = pool_elt_at_index (bm->buffer_free_list_pool, free_list_index);
+
+ len = vec_len (fl->buffers);
+
+ if (PREDICT_FALSE (len < n_buffers))
+ {
+ bm->cb.vlib_buffer_fill_free_list_cb (vm, fl, n_buffers);
+ len = vec_len (fl->buffers);
- ASSERT (bm->cb.vlib_buffer_alloc_from_free_list_cb);
+ /* 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);
- return bm->cb.vlib_buffer_alloc_from_free_list_cb (vm, buffers, n_buffers,
- free_list_index);
+ /* following code is intentionaly duplicated to allow compiler
+ to optimize fast path when n_buffers is constant value */
+ src = fl->buffers + len - n_buffers;
+ clib_memcpy (buffers, src, n_buffers * sizeof (u32));
+ _vec_len (fl->buffers) -= n_buffers;
+
+ /* Verify that buffers are known free. */
+ vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
+ VLIB_BUFFER_KNOWN_FREE);
+
+ return n_buffers;
+ }
+
+ src = fl->buffers + len - n_buffers;
+ clib_memcpy (buffers, src, n_buffers * sizeof (u32));
+ _vec_len (fl->buffers) -= n_buffers;
+
+ /* Verify that buffers are known free. */
+ vlib_buffer_validate_alloc_free (vm, buffers, n_buffers,
+ VLIB_BUFFER_KNOWN_FREE);
+
+ return n_buffers;
+}
+
+/** \brief Allocate buffers 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
+ @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);
}
/** \brief Free buffers