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authorDamjan Marion <damarion@cisco.com>2017-11-24 20:15:23 +0100
committerDave Barach <openvpp@barachs.net>2017-11-27 14:53:23 +0000
commitc8a26c6d239554bac96c481c840b3f5b3d8a17af (patch)
tree4ad52a5fd5bbbd7c3dd1ca976d5cd9e9b2c03cd5 /src/vlib
parent8b9a5d198cc316d36b93f19fee7a351fc3922e4a (diff)
vlib: make vlib_buffer_alloc inline function
Currently, every alloc involves callback function call. With this change callback function is called only if there is no empty buffers on the free list. Change-Id: I2238c19ece7ce182c49ba0f2485add52f335f3b6 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vlib')
-rw-r--r--src/vlib/buffer.c71
-rw-r--r--src/vlib/buffer.h12
-rw-r--r--src/vlib/buffer_funcs.h80
-rw-r--r--src/vlib/mc.c2
4 files changed, 72 insertions, 93 deletions
diff --git a/src/vlib/buffer.c b/src/vlib/buffer.c
index f00e8854ac1..880cd95a067 100644
--- a/src/vlib/buffer.c
+++ b/src/vlib/buffer.c
@@ -294,7 +294,7 @@ vlib_main_t **vlib_mains = &__bootstrap_vlib_main_vector.vm;
/* When dubugging validate that given buffers are either known allocated
or known free. */
-static void
+void
vlib_buffer_validate_alloc_free (vlib_main_t * vm,
u32 * buffers,
uword n_buffers,
@@ -306,6 +306,9 @@ vlib_buffer_validate_alloc_free (vlib_main_t * vm,
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++)
@@ -509,8 +512,9 @@ vlib_buffer_delete_free_list_internal (vlib_main_t * vm, u32 free_list_index)
/* Make sure free list has at least given number of free buffers. */
static uword
-fill_free_list (vlib_main_t * vm,
- vlib_buffer_free_list_t * fl, uword min_free_buffers)
+vlib_buffer_fill_free_list_internal (vlib_main_t * vm,
+ vlib_buffer_free_list_t * fl,
+ uword min_free_buffers)
{
vlib_buffer_t *buffers, *b;
vlib_buffer_free_list_t *mfl;
@@ -596,63 +600,6 @@ fill_free_list (vlib_main_t * vm,
return n_alloc;
}
-static u32
-alloc_from_free_list (vlib_main_t * vm,
- vlib_buffer_free_list_t * free_list,
- u32 * alloc_buffers, u32 n_alloc_buffers)
-{
- u32 *dst, *src;
- uword len;
- uword n_filled;
-
- dst = alloc_buffers;
-
- n_filled = fill_free_list (vm, free_list, n_alloc_buffers);
- if (n_filled == 0)
- return 0;
-
- len = vec_len (free_list->buffers);
- ASSERT (len >= n_alloc_buffers);
-
- src = free_list->buffers + len - n_alloc_buffers;
- clib_memcpy (dst, src, n_alloc_buffers * sizeof (u32));
-
- _vec_len (free_list->buffers) -= n_alloc_buffers;
-
- /* Verify that buffers are known free. */
- vlib_buffer_validate_alloc_free (vm, alloc_buffers,
- n_alloc_buffers, VLIB_BUFFER_KNOWN_FREE);
-
- return n_alloc_buffers;
-}
-
-
-/* Allocate a given number of buffers into given array.
- Returns number actually allocated which will be either zero or
- number requested. */
-static u32
-vlib_buffer_alloc_internal (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
-{
- vlib_buffer_main_t *bm = vm->buffer_main;
-
- return alloc_from_free_list
- (vm,
- pool_elt_at_index (bm->buffer_free_list_pool,
- VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX),
- buffers, n_buffers);
-}
-
-static u32
-vlib_buffer_alloc_from_free_list_internal (vlib_main_t * vm,
- u32 * buffers,
- u32 n_buffers, u32 free_list_index)
-{
- vlib_buffer_main_t *bm = vm->buffer_main;
- vlib_buffer_free_list_t *f;
- f = pool_elt_at_index (bm->buffer_free_list_pool, free_list_index);
- return alloc_from_free_list (vm, f, buffers, n_buffers);
-}
-
void *
vlib_set_buffer_free_callback (vlib_main_t * vm, void *fp)
{
@@ -1087,9 +1034,7 @@ vlib_buffer_main_init (struct vlib_main_t * vm)
return 0;
}
- bm->cb.vlib_buffer_alloc_cb = &vlib_buffer_alloc_internal;
- bm->cb.vlib_buffer_alloc_from_free_list_cb =
- &vlib_buffer_alloc_from_free_list_internal;
+ 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 =
diff --git a/src/vlib/buffer.h b/src/vlib/buffer.h
index 21bed48ac14..c3c4def0991 100644
--- a/src/vlib/buffer.h
+++ b/src/vlib/buffer.h
@@ -380,12 +380,9 @@ typedef struct vlib_buffer_free_list_t
uword buffer_init_function_opaque;
} __attribute__ ((aligned (16))) vlib_buffer_free_list_t;
-typedef u32 (vlib_buffer_alloc_cb_t) (struct vlib_main_t * vm, u32 * buffers,
- u32 n_buffers);
-typedef u32 (vlib_buffer_alloc_from_free_list_cb_t) (struct vlib_main_t * vm,
- u32 * buffers,
- u32 n_buffers,
- u32 free_list_index);
+typedef uword (vlib_buffer_fill_free_list_cb_t) (struct vlib_main_t * vm,
+ vlib_buffer_free_list_t * fl,
+ uword min_free_buffers);
typedef void (vlib_buffer_free_cb_t) (struct vlib_main_t * vm, u32 * buffers,
u32 n_buffers);
typedef void (vlib_buffer_free_no_next_cb_t) (struct vlib_main_t * vm,
@@ -393,8 +390,7 @@ typedef void (vlib_buffer_free_no_next_cb_t) (struct vlib_main_t * vm,
typedef struct
{
- vlib_buffer_alloc_cb_t *vlib_buffer_alloc_cb;
- vlib_buffer_alloc_from_free_list_cb_t *vlib_buffer_alloc_from_free_list_cb;
+ vlib_buffer_fill_free_list_cb_t *vlib_buffer_fill_free_list_cb;
vlib_buffer_free_cb_t *vlib_buffer_free_cb;
vlib_buffer_free_no_next_cb_t *vlib_buffer_free_no_next_cb;
void (*vlib_packet_template_init_cb) (struct vlib_main_t * vm, void *t,
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
diff --git a/src/vlib/mc.c b/src/vlib/mc.c
index e57962c94de..a289871f570 100644
--- a/src/vlib/mc.c
+++ b/src/vlib/mc.c
@@ -109,7 +109,7 @@ mc_seq_cmp (u32 x, u32 y)
void *
mc_get_vlib_buffer (vlib_main_t * vm, u32 n_bytes, u32 * bi_return)
{
- u32 n_alloc, bi;
+ u32 n_alloc, bi = 0;
vlib_buffer_t *b;
n_alloc = vlib_buffer_alloc (vm, &bi, 1);