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authorDamjan Marion <damarion@cisco.com>2017-02-05 23:44:42 +0100
committerDave Barach <openvpp@barachs.net>2017-02-06 13:54:50 +0000
commitbd69a5f24c6e83e9101f203dd124864fb2877a17 (patch)
tree7c0c896d5cd5abea4cbe75dbe979bbdaa3f60b3a /src/vnet/devices/dpdk/buffer.c
parent63205141704cb1adafd1b5108f787e640eda71e9 (diff)
vlib: remove algned/unaligned buffers scheme
Change-Id: I4433eaed3f4e201edc329c4842cbbf74beb19a9a Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/devices/dpdk/buffer.c')
-rw-r--r--src/vnet/devices/dpdk/buffer.c131
1 files changed, 13 insertions, 118 deletions
diff --git a/src/vnet/devices/dpdk/buffer.c b/src/vnet/devices/dpdk/buffer.c
index 038f46d9859..43ceb91e773 100644
--- a/src/vnet/devices/dpdk/buffer.c
+++ b/src/vnet/devices/dpdk/buffer.c
@@ -79,8 +79,6 @@
STATIC_ASSERT (VLIB_BUFFER_PRE_DATA_SIZE == RTE_PKTMBUF_HEADROOM,
"VLIB_BUFFER_PRE_DATA_SIZE must be equal to RTE_PKTMBUF_HEADROOM");
-#define BUFFERS_PER_COPY (sizeof (vlib_copy_unit_t) / sizeof (u32))
-
static void
del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f)
{
@@ -88,23 +86,15 @@ del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f)
struct rte_mbuf *mb;
vlib_buffer_t *b;
- for (i = 0; i < vec_len (f->unaligned_buffers); i++)
+ for (i = 0; i < vec_len (f->buffers); i++)
{
- b = vlib_get_buffer (vm, f->unaligned_buffers[i]);
- mb = rte_mbuf_from_vlib_buffer (b);
- ASSERT (rte_mbuf_refcnt_read (mb) == 1);
- rte_pktmbuf_free (mb);
- }
- for (i = 0; i < vec_len (f->aligned_buffers); i++)
- {
- b = vlib_get_buffer (vm, f->aligned_buffers[i]);
+ b = vlib_get_buffer (vm, f->buffers[i]);
mb = rte_mbuf_from_vlib_buffer (b);
ASSERT (rte_mbuf_refcnt_read (mb) == 1);
rte_pktmbuf_free (mb);
}
vec_free (f->name);
- vec_free (f->unaligned_buffers);
- vec_free (f->aligned_buffers);
+ vec_free (f->buffers);
}
/* Add buffer free list. */
@@ -162,15 +152,13 @@ fill_free_list (vlib_main_t * vm,
if (PREDICT_FALSE (rmp == 0))
return 0;
- vlib_buffer_free_list_trim_aligned (fl);
-
/* Already have enough free buffers on free list? */
- n = min_free_buffers - vec_len (fl->aligned_buffers);
+ 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, BUFFERS_PER_COPY);
+ 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_physmem_alloc);
@@ -192,7 +180,7 @@ fill_free_list (vlib_main_t * vm,
b = vlib_buffer_from_rte_mbuf (mb);
bi = vlib_get_buffer_index (vm, b);
- vec_add1_aligned (fl->aligned_buffers, bi, sizeof (vlib_copy_unit_t));
+ vec_add1_aligned (fl->buffers, bi, CLIB_CACHE_LINE_BYTES);
n_alloc++;
n_remaining--;
@@ -207,120 +195,27 @@ fill_free_list (vlib_main_t * vm,
return n;
}
-always_inline uword
-copy_alignment (u32 * x)
-{
- return (pointer_to_uword (x) / sizeof (x[0])) % BUFFERS_PER_COPY;
-}
-
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, *u_src;
- uword u_len, n_left;
- uword n_unaligned_start, n_unaligned_end, n_filled;
+ u32 *dst, *src;
+ uword len, n_filled;
- n_left = n_alloc_buffers;
dst = alloc_buffers;
- n_unaligned_start = ((BUFFERS_PER_COPY - copy_alignment (dst))
- & (BUFFERS_PER_COPY - 1));
n_filled = fill_free_list (vm, free_list, n_alloc_buffers);
if (n_filled == 0)
return 0;
- n_left = n_filled < n_left ? n_filled : n_left;
- n_alloc_buffers = n_left;
-
- if (n_unaligned_start >= n_left)
- {
- n_unaligned_start = n_left;
- n_unaligned_end = 0;
- }
- else
- n_unaligned_end = copy_alignment (dst + n_alloc_buffers);
-
- vlib_buffer_free_list_fill_unaligned (vm, free_list,
- n_unaligned_start + n_unaligned_end);
-
- u_len = vec_len (free_list->unaligned_buffers);
- u_src = free_list->unaligned_buffers + u_len - 1;
-
- if (n_unaligned_start)
- {
- uword n_copy = n_unaligned_start;
- if (n_copy > n_left)
- n_copy = n_left;
- n_left -= n_copy;
-
- while (n_copy > 0)
- {
- *dst++ = *u_src--;
- n_copy--;
- u_len--;
- }
-
- /* Now dst should be aligned. */
- if (n_left > 0)
- ASSERT (pointer_to_uword (dst) % sizeof (vlib_copy_unit_t) == 0);
- }
-
- /* Aligned copy. */
- {
- vlib_copy_unit_t *d, *s;
- uword n_copy;
-
- if (vec_len (free_list->aligned_buffers) <
- ((n_left / BUFFERS_PER_COPY) * BUFFERS_PER_COPY))
- abort ();
-
- n_copy = n_left / BUFFERS_PER_COPY;
- n_left = n_left % BUFFERS_PER_COPY;
-
- /* Remove buffers from aligned free list. */
- _vec_len (free_list->aligned_buffers) -= n_copy * BUFFERS_PER_COPY;
-
- s = (vlib_copy_unit_t *) vec_end (free_list->aligned_buffers);
- d = (vlib_copy_unit_t *) dst;
+ len = vec_len (free_list->buffers);
+ ASSERT (len >= n_alloc_buffers);
- /* Fast path loop. */
- while (n_copy >= 4)
- {
- d[0] = s[0];
- d[1] = s[1];
- d[2] = s[2];
- d[3] = s[3];
- n_copy -= 4;
- s += 4;
- d += 4;
- }
-
- while (n_copy >= 1)
- {
- d[0] = s[0];
- n_copy -= 1;
- s += 1;
- d += 1;
- }
-
- dst = (void *) d;
- }
-
- /* Unaligned copy. */
- ASSERT (n_unaligned_end == n_left);
- while (n_left > 0)
- {
- *dst++ = *u_src--;
- n_left--;
- u_len--;
- }
+ src = free_list->buffers + len - n_alloc_buffers;
+ clib_memcpy (dst, src, n_alloc_buffers * sizeof (u32));
- if (!free_list->unaligned_buffers)
- ASSERT (u_len == 0);
- else
- _vec_len (free_list->unaligned_buffers) = u_len;
+ _vec_len (free_list->buffers) -= n_alloc_buffers;
return n_alloc_buffers;
}