vlib: 512-bit SIMD version of vlib_buffer_free

Process 8 packets perf batch in vlib_buffer_free_inline() when
CLIB_HAVE_VEC512 is enabled.

Type: improvement

Signed-off-by: Leyi Rong <leyi.rong@intel.com>
Change-Id: I78b8a525bce25ee355c9bf0e0f651698a8c45bda

2 files changed, 73 insertions, 2 deletions

diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h
index 708539957c9..017a70f4fbf 100644
--- a/src/vlib/buffer_funcs.h
+++ b/src/vlib/buffer_funcs.h
@@ -788,9 +788,16 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
       vlib_buffer_t *b[8];
       u32 bi, sum = 0, flags, next;
 
+#if defined(CLIB_HAVE_VEC512)
+      if (n_buffers < 8)
+#else
       if (n_buffers < 4)
+#endif
 	goto one_by_one;
 
+#if defined(CLIB_HAVE_VEC512)
+      vlib_get_buffers (vm, buffers, b, 8);
+#else
       vlib_get_buffers (vm, buffers, b, 4);
 
       if (n_buffers >= 12)
@@ -801,8 +808,33 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
 	  vlib_prefetch_buffer_header (b[6], LOAD);
 	  vlib_prefetch_buffer_header (b[7], LOAD);
 	}
+#endif
 
-#if defined(CLIB_HAVE_VEC128)
+#if defined(CLIB_HAVE_VEC512)
+      u8x16 p0, p1, p2, p3, p4, p5, p6, p7, r;
+      p0 = u8x16_load_unaligned (b[0]);
+      p1 = u8x16_load_unaligned (b[1]);
+      p2 = u8x16_load_unaligned (b[2]);
+      p3 = u8x16_load_unaligned (b[3]);
+      p4 = u8x16_load_unaligned (b[4]);
+      p5 = u8x16_load_unaligned (b[5]);
+      p6 = u8x16_load_unaligned (b[6]);
+      p7 = u8x16_load_unaligned (b[7]);
+
+      r = p0 ^ bpi_vec.as_u8x16[0];
+      r |= p1 ^ bpi_vec.as_u8x16[0];
+      r |= p2 ^ bpi_vec.as_u8x16[0];
+      r |= p3 ^ bpi_vec.as_u8x16[0];
+      r |= p4 ^ bpi_vec.as_u8x16[0];
+      r |= p5 ^ bpi_vec.as_u8x16[0];
+      r |= p6 ^ bpi_vec.as_u8x16[0];
+      r |= p7 ^ bpi_vec.as_u8x16[0];
+      r &= bpi_mask.as_u8x16[0];
+      r |=
+	(p0 | p1 | p2 | p3 | p4 | p5 | p6 | p7) & flags_refs_mask.as_u8x16[0];
+
+      sum = !u8x16_is_all_zero (r);
+#elif defined(CLIB_HAVE_VEC128)
       u8x16 p0, p1, p2, p3, r;
       p0 = u8x16_load_unaligned (b[0]);
       p1 = u8x16_load_unaligned (b[1]);
@@ -836,6 +868,36 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
       if (sum)
 	goto one_by_one;
 
+#if defined(CLIB_HAVE_VEC512)
+      vlib_buffer_copy_indices (queue + n_queue, buffers, 8);
+      vlib_buffer_copy_template (b[0], &bt);
+      vlib_buffer_copy_template (b[1], &bt);
+      vlib_buffer_copy_template (b[2], &bt);
+      vlib_buffer_copy_template (b[3], &bt);
+      vlib_buffer_copy_template (b[4], &bt);
+      vlib_buffer_copy_template (b[5], &bt);
+      vlib_buffer_copy_template (b[6], &bt);
+      vlib_buffer_copy_template (b[7], &bt);
+      n_queue += 8;
+
+      vlib_buffer_validate (vm, b[0]);
+      vlib_buffer_validate (vm, b[1]);
+      vlib_buffer_validate (vm, b[2]);
+      vlib_buffer_validate (vm, b[3]);
+      vlib_buffer_validate (vm, b[4]);
+      vlib_buffer_validate (vm, b[5]);
+      vlib_buffer_validate (vm, b[6]);
+      vlib_buffer_validate (vm, b[7]);
+
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[4]);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[5]);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[6]);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[7]);
+#else
       vlib_buffer_copy_indices (queue + n_queue, buffers, 4);
       vlib_buffer_copy_template (b[0], &bt);
       vlib_buffer_copy_template (b[1], &bt);
@@ -852,14 +914,20 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
+#endif
 
       if (n_queue >= queue_size)
 	{
 	  vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue);
 	  n_queue = 0;
 	}
+#if defined(CLIB_HAVE_VEC512)
+      buffers += 8;
+      n_buffers -= 8;
+#else
       buffers += 4;
       n_buffers -= 4;
+#endif
       continue;
 
     one_by_one:
diff --git a/src/vppinfra/vector/index_to_ptr.h b/src/vppinfra/vector/index_to_ptr.h
index 91de3546439..3985b757d54 100644
--- a/src/vppinfra/vector/index_to_ptr.h
+++ b/src/vppinfra/vector/index_to_ptr.h
@@ -92,7 +92,7 @@ clib_index_to_ptr_u32 (u32 *indices, void *base, u8 shift, void **ptrs,
 	  indices += 16;
 	  n_elts -= 16;
 	}
-      if (n_elts > 8)
+      if (n_elts >= 8)
 	{
 	  b0 = u64x8_from_u32x8 (u32x8_load_unaligned (indices));
 	  u64x8_store_unaligned ((b0 << shift) + off, ptrs);
@@ -101,6 +101,9 @@ clib_index_to_ptr_u32 (u32 *indices, void *base, u8 shift, void **ptrs,
 	  n_elts -= 8;
 	}
 
+      if (n_elts == 0)
+	return;
+
       b0 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + n_elts - 8));
       u64x8_store_unaligned ((b0 << shift) + off, ptrs + n_elts - 8);
     }