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authorDamjan Marion <damarion@cisco.com>2017-07-13 18:53:27 +0200
committerDave Barach <openvpp@barachs.net>2017-07-14 15:39:24 +0000
commit072401e8096c648b91f958bd911f64ce24fecff9 (patch)
tree5ef774bbcf5e9c072b8795d39115b012015e05f1 /src/vlib
parent0f09b77778644577545235156a2ea2798ec9ee6c (diff)
Introduce l{2,3,4}_hdr_offset fields in the buffer metadata
To save space in the first cacheline following is changed: - total_length_not_including_first_buffer moved to the 2nd cacheline. This field is used only when VLIB_BUFFER_TOTAL_LENGTH_VALID and VLIB_BUFFER_NEXT_PRESENT are both set. - free_list_index is now stored in 4bits inside flags, which allows up to 16 free lists. In case we need more we can store index in the 2nd cachelin Change-Id: Ic8521350819391af470d31d3fa1013e67ecb7681 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vlib')
-rw-r--r--src/vlib/buffer.c16
-rw-r--r--src/vlib/buffer.h40
-rw-r--r--src/vlib/buffer_funcs.h50
3 files changed, 68 insertions, 38 deletions
diff --git a/src/vlib/buffer.c b/src/vlib/buffer.c
index b2a095cfb1a..53b60c165c1 100644
--- a/src/vlib/buffer.c
+++ b/src/vlib/buffer.c
@@ -72,8 +72,8 @@ format_vlib_buffer (u8 * s, va_list * args)
uword indent = format_get_indent (s);
s = format (s, "current data %d, length %d, free-list %d, clone-count %u",
- b->current_data, b->current_length, b->free_list_index,
- b->n_add_refs);
+ 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",
@@ -163,10 +163,14 @@ vlib_validate_buffer_helper (vlib_main_t * vm,
vlib_buffer_main_t *bm = vm->buffer_main;
vlib_buffer_free_list_t *fl;
- if (pool_is_free_index (bm->buffer_free_list_pool, b->free_list_index))
- return format (0, "unknown free list 0x%x", b->free_list_index);
+ if (pool_is_free_index
+ (bm->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 (bm->buffer_free_list_pool, b->free_list_index);
+ fl =
+ pool_elt_at_index (bm->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);
@@ -388,7 +392,7 @@ vlib_buffer_create_free_list_helper (vlib_main_t * vm,
f->name = clib_mem_is_vec (name) ? name : format (0, "%s", name);
/* Setup free buffer template. */
- f->buffer_init_template.free_list_index = f->index;
+ vlib_buffer_set_free_list_index (&f->buffer_init_template, f->index);
f->buffer_init_template.n_add_refs = 0;
if (is_public)
diff --git a/src/vlib/buffer.h b/src/vlib/buffer.h
index b20538b7f8c..c810db4e860 100644
--- a/src/vlib/buffer.h
+++ b/src/vlib/buffer.h
@@ -72,6 +72,7 @@ typedef struct
the end of this buffer.
*/
u32 flags; /**< buffer flags:
+ <br> VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index,
<br> VLIB_BUFFER_IS_TRACED: trace this buffer.
<br> VLIB_BUFFER_NEXT_PRESENT: this is a multi-chunk buffer.
<br> VLIB_BUFFER_TOTAL_LENGTH_VALID: as it says
@@ -82,28 +83,26 @@ typedef struct
set to avoid adding it to a flow report
<br> VLIB_BUFFER_FLAG_USER(n): user-defined bit N
*/
-#define VLIB_BUFFER_IS_TRACED (1 << 0)
-#define VLIB_BUFFER_LOG2_NEXT_PRESENT (1)
+
+/* any change to the following line requres update of
+ * vlib_buffer_get_free_list_index(...) and
+ * vlib_buffer_set_free_list_index(...) functions */
+#define VLIB_BUFFER_FREE_LIST_INDEX_MASK ((1 << 4) - 1)
+
+#define VLIB_BUFFER_IS_TRACED (1 << 4)
+#define VLIB_BUFFER_LOG2_NEXT_PRESENT (5)
#define VLIB_BUFFER_NEXT_PRESENT (1 << VLIB_BUFFER_LOG2_NEXT_PRESENT)
-#define VLIB_BUFFER_IS_RECYCLED (1 << 2)
-#define VLIB_BUFFER_TOTAL_LENGTH_VALID (1 << 3)
-#define VLIB_BUFFER_REPL_FAIL (1 << 4)
-#define VLIB_BUFFER_RECYCLE (1 << 5)
-#define VLIB_BUFFER_FLOW_REPORT (1 << 6)
-#define VLIB_BUFFER_EXT_HDR_VALID (1 << 7)
+#define VLIB_BUFFER_IS_RECYCLED (1 << 6)
+#define VLIB_BUFFER_TOTAL_LENGTH_VALID (1 << 7)
+#define VLIB_BUFFER_REPL_FAIL (1 << 8)
+#define VLIB_BUFFER_RECYCLE (1 << 9)
+#define VLIB_BUFFER_FLOW_REPORT (1 << 10)
+#define VLIB_BUFFER_EXT_HDR_VALID (1 << 11)
/* User defined buffer flags. */
#define LOG2_VLIB_BUFFER_FLAG_USER(n) (32 - (n))
#define VLIB_BUFFER_FLAG_USER(n) (1 << LOG2_VLIB_BUFFER_FLAG_USER(n))
- u32 free_list_index; /**< Buffer free list that this buffer was
- allocated from and will be freed to.
- */
-
- u32 total_length_not_including_first_buffer;
- /**< Only valid for first buffer in chain. Current length plus
- total length given here give total number of bytes in buffer chain.
- */
STRUCT_MARK (template_end);
u32 next_buffer; /**< Next buffer for this linked-list of buffers.
@@ -128,7 +127,7 @@ typedef struct
Before allocating any of it, discussion required!
*/
- u32 opaque[8]; /**< Opaque data used by sub-graphs for their own purposes.
+ u32 opaque[10]; /**< Opaque data used by sub-graphs for their own purposes.
See .../vnet/vnet/buffer.h
*/
CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
@@ -137,7 +136,12 @@ typedef struct
if VLIB_PACKET_IS_TRACED flag is set.
*/
u32 recycle_count; /**< Used by L2 path recycle code */
- u32 opaque2[14]; /**< More opaque data, currently unused */
+
+ u32 total_length_not_including_first_buffer;
+ /**< Only valid for first buffer in chain. Current length plus
+ total length given here give total number of bytes in buffer chain.
+ */
+ u32 opaque2[13]; /**< More opaque data, currently unused */
/***** end of second cache line */
CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h
index 97442e12239..1aaac0b2a11 100644
--- a/src/vlib/buffer_funcs.h
+++ b/src/vlib/buffer_funcs.h
@@ -106,12 +106,15 @@ uword vlib_buffer_length_in_chain_slow_path (vlib_main_t * vm,
always_inline uword
vlib_buffer_length_in_chain (vlib_main_t * vm, vlib_buffer_t * b)
{
- uword l = b->current_length + b->total_length_not_including_first_buffer;
- if (PREDICT_FALSE ((b->flags & (VLIB_BUFFER_NEXT_PRESENT
- | VLIB_BUFFER_TOTAL_LENGTH_VALID))
- == VLIB_BUFFER_NEXT_PRESENT))
- return vlib_buffer_length_in_chain_slow_path (vm, b);
- return l;
+ uword len = b->current_length;
+
+ if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
+ return len;
+
+ if (PREDICT_TRUE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
+ return len + b->total_length_not_including_first_buffer;
+
+ return vlib_buffer_length_in_chain_slow_path (vm, b);
}
/** \brief Get length in bytes of the buffer index buffer chain
@@ -261,6 +264,24 @@ vlib_buffer_round_size (u32 size)
return round_pow2 (size, sizeof (vlib_buffer_t));
}
+always_inline u32
+vlib_buffer_get_free_list_index (vlib_buffer_t * b)
+{
+ return b->flags & VLIB_BUFFER_FREE_LIST_INDEX_MASK;
+}
+
+always_inline void
+vlib_buffer_set_free_list_index (vlib_buffer_t * b, u32 index)
+{
+ /* if there is an need for more free lists we should consider
+ storig data in the 2nd cacheline */
+ ASSERT (VLIB_BUFFER_FREE_LIST_INDEX_MASK & 1);
+ ASSERT (index <= VLIB_BUFFER_FREE_LIST_INDEX_MASK);
+
+ b->flags &= ~VLIB_BUFFER_FREE_LIST_INDEX_MASK;
+ b->flags |= index & VLIB_BUFFER_FREE_LIST_INDEX_MASK;
+}
+
/** \brief Allocate buffers from specific freelist into supplied array
@param vm - (vlib_main_t *) vlib main data structure pointer
@@ -381,7 +402,7 @@ vlib_buffer_get_buffer_free_list (vlib_main_t * vm, vlib_buffer_t * b,
vlib_buffer_main_t *bm = vm->buffer_main;
u32 i;
- *index = i = b->free_list_index;
+ *index = i = vlib_buffer_get_free_list_index (b);
return pool_elt_at_index (bm->buffer_free_list_pool, i);
}
@@ -569,7 +590,8 @@ vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
}
n_buffers = vlib_buffer_alloc_from_free_list (vm, buffers, n_buffers,
- s->free_list_index);
+ vlib_buffer_get_free_list_index
+ (s));
if (PREDICT_FALSE (n_buffers == 0))
{
buffers[0] = src_buffer;
@@ -581,7 +603,8 @@ vlib_buffer_clone (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
d->current_data = s->current_data;
d->current_length = head_end_offset;
- d->free_list_index = s->free_list_index;
+ vlib_buffer_set_free_list_index (d,
+ vlib_buffer_get_free_list_index (s));
d->total_length_not_including_first_buffer =
s->total_length_not_including_first_buffer + s->current_length -
head_end_offset;
@@ -615,7 +638,8 @@ vlib_buffer_attach_clone (vlib_main_t * vm, vlib_buffer_t * head,
vlib_buffer_t * tail)
{
ASSERT ((head->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
- ASSERT (head->free_list_index == tail->free_list_index);
+ ASSERT (vlib_buffer_get_free_list_index (head) ==
+ vlib_buffer_get_free_list_index (tail));
head->flags |= VLIB_BUFFER_NEXT_PRESENT;
head->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
@@ -791,7 +815,7 @@ vlib_buffer_init_for_free_list (vlib_buffer_t * dst,
CLIB_CACHE_LINE_BYTES * 2);
/* Make sure buffer template is sane. */
- ASSERT (fl->index == fl->buffer_init_template.free_list_index);
+ ASSERT (fl->index == vlib_buffer_get_free_list_index (src));
clib_memcpy (STRUCT_MARK_PTR (dst, template_start),
STRUCT_MARK_PTR (src, template_start),
@@ -806,7 +830,6 @@ vlib_buffer_init_for_free_list (vlib_buffer_t * dst,
_(current_data);
_(current_length);
_(flags);
- _(free_list_index);
#undef _
ASSERT (dst->total_length_not_including_first_buffer == 0);
ASSERT (dst->n_add_refs == 0);
@@ -832,7 +855,7 @@ vlib_buffer_init_two_for_free_list (vlib_buffer_t * dst0,
vlib_buffer_t *src = &fl->buffer_init_template;
/* Make sure buffer template is sane. */
- ASSERT (fl->index == fl->buffer_init_template.free_list_index);
+ ASSERT (fl->index == vlib_buffer_get_free_list_index (src));
clib_memcpy (STRUCT_MARK_PTR (dst0, template_start),
STRUCT_MARK_PTR (src, template_start),
@@ -853,7 +876,6 @@ vlib_buffer_init_two_for_free_list (vlib_buffer_t * dst0,
_(current_data);
_(current_length);
_(flags);
- _(free_list_index);
#undef _
ASSERT (dst0->total_length_not_including_first_buffer == 0);