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authorDamjan Marion <damarion@cisco.com>2021-10-28 23:03:04 +0200
committerDamjan Marion <damarion@cisco.com>2021-11-08 21:49:51 +0100
commit4c53ff459595c9ddc05002ee1847313127175b5f (patch)
tree68cff1cf0bcc2cedceb74f1b8e98eb66d05d1a7e /src/vlib/buffer_funcs.h
parent66b057e563c87dbc469c06313850fe3b9f5ee2f8 (diff)
vppinfra: vectorized index to pointer function
Type: improvement Change-Id: I05e1a8fa31761b113355123429d72da18881d4b0 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vlib/buffer_funcs.h')
-rw-r--r--src/vlib/buffer_funcs.h121
1 files changed, 29 insertions, 92 deletions
diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h
index 77964fde821..30fe23443ab 100644
--- a/src/vlib/buffer_funcs.h
+++ b/src/vlib/buffer_funcs.h
@@ -42,6 +42,7 @@
#include <vppinfra/hash.h>
#include <vppinfra/fifo.h>
+#include <vppinfra/vector/index_to_ptr.h>
#include <vlib/buffer.h>
#include <vlib/physmem_funcs.h>
#include <vlib/main.h>
@@ -201,102 +202,38 @@ vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node)
@param offset - (i32) offset applied to each pointer
*/
static_always_inline void
-vlib_get_buffers_with_offset (vlib_main_t * vm, u32 * bi, void **b, int count,
+vlib_get_buffers_with_offset (vlib_main_t *vm, u32 *bi, void **b, u32 count,
i32 offset)
{
uword buffer_mem_start = vm->buffer_main->buffer_mem_start;
-#ifdef CLIB_HAVE_VEC512
- u64x8 of8 = u64x8_splat (buffer_mem_start + offset);
- u64x4 off = u64x8_extract_lo (of8);
- /* if count is not const, compiler will not unroll while loop
- se we maintain two-in-parallel variant */
- while (count >= 32)
- {
- u64x8 b0 = u64x8_from_u32x8 (u32x8_load_unaligned (bi));
- u64x8 b1 = u64x8_from_u32x8 (u32x8_load_unaligned (bi + 8));
- u64x8 b2 = u64x8_from_u32x8 (u32x8_load_unaligned (bi + 16));
- u64x8 b3 = u64x8_from_u32x8 (u32x8_load_unaligned (bi + 24));
- /* shift and add to get vlib_buffer_t pointer */
- u64x8_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + of8, b);
- u64x8_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + of8, b + 8);
- u64x8_store_unaligned ((b2 << CLIB_LOG2_CACHE_LINE_BYTES) + of8, b + 16);
- u64x8_store_unaligned ((b3 << CLIB_LOG2_CACHE_LINE_BYTES) + of8, b + 24);
- b += 32;
- bi += 32;
- count -= 32;
- }
- while (count >= 8)
- {
- u64x8 b0 = u64x8_from_u32x8 (u32x8_load_unaligned (bi));
- /* shift and add to get vlib_buffer_t pointer */
- u64x8_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + of8, b);
- b += 8;
- bi += 8;
- count -= 8;
- }
-#elif defined CLIB_HAVE_VEC256
- 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 >= 32)
- {
- u64x4 b0 = u64x4_from_u32x4 (u32x4_load_unaligned (bi));
- u64x4 b1 = u64x4_from_u32x4 (u32x4_load_unaligned (bi + 4));
- u64x4 b2 = u64x4_from_u32x4 (u32x4_load_unaligned (bi + 8));
- u64x4 b3 = u64x4_from_u32x4 (u32x4_load_unaligned (bi + 12));
- u64x4 b4 = u64x4_from_u32x4 (u32x4_load_unaligned (bi + 16));
- u64x4 b5 = u64x4_from_u32x4 (u32x4_load_unaligned (bi + 20));
- u64x4 b6 = u64x4_from_u32x4 (u32x4_load_unaligned (bi + 24));
- u64x4 b7 = u64x4_from_u32x4 (u32x4_load_unaligned (bi + 28));
- /* shift and add to get vlib_buffer_t pointer */
- u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b);
- u64x4_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 4);
- u64x4_store_unaligned ((b2 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 8);
- u64x4_store_unaligned ((b3 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 12);
- u64x4_store_unaligned ((b4 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 16);
- u64x4_store_unaligned ((b5 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 20);
- u64x4_store_unaligned ((b6 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 24);
- u64x4_store_unaligned ((b7 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 28);
- b += 32;
- bi += 32;
- count -= 32;
- }
-#endif
- while (count >= 4)
- {
-#ifdef CLIB_HAVE_VEC256
- u64x4 b0 = u64x4_from_u32x4 (u32x4_load_unaligned (bi));
- /* 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_mem_start + offset);
- u32x4 bi4 = u32x4_load_unaligned (bi);
- u64x2 b0 = u64x2_from_u32x4 ((u32x4) bi4);
-#if defined (__aarch64__)
- u64x2 b1 = u64x2_from_u32x4_high ((u32x4) bi4);
-#else
- bi4 = u32x4_shuffle (bi4, 2, 3, 0, 1);
- u64x2 b1 = u64x2_from_u32x4 ((u32x4) bi4);
-#endif
- 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] = 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;
- count -= 4;
- }
- while (count)
+ void *base = (void *) (buffer_mem_start + offset);
+ int objsize = __builtin_object_size (b, 0);
+ const int sh = CLIB_LOG2_CACHE_LINE_BYTES;
+
+ if (COMPILE_TIME_CONST (count) == 0 && objsize >= 64 * sizeof (b[0]) &&
+ (objsize & ((8 * sizeof (b[0])) - 1)) == 0)
{
- b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset);
- b += 1;
- bi += 1;
- count -= 1;
+ u32 n = round_pow2 (count, 8);
+ ASSERT (objsize >= count);
+ CLIB_ASSUME (objsize >= count);
+ while (n >= 64)
+ {
+ clib_index_to_ptr_u32 (bi, base, sh, b, 64);
+ b += 64;
+ bi += 64;
+ n -= 64;
+ }
+
+ while (n)
+ {
+ clib_index_to_ptr_u32 (bi, base, sh, b, 8);
+ b += 8;
+ bi += 8;
+ n -= 8;
+ }
}
+ else
+ clib_index_to_ptr_u32 (bi, base, sh, b, count);
}
/** \brief Translate array of buffer indices into buffer pointers
@@ -308,7 +245,7 @@ vlib_get_buffers_with_offset (vlib_main_t * vm, u32 * bi, void **b, int count,
*/
static_always_inline void
-vlib_get_buffers (vlib_main_t * vm, u32 * bi, vlib_buffer_t ** b, int count)
+vlib_get_buffers (vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, u32 count)
{
vlib_get_buffers_with_offset (vm, bi, (void **) b, count, 0);
}