avf: optimized with NEON SIMD instruction

Optimize avf-input node processing function with NEON SIMD instruction.

Type: improvement

Change-Id: I3dd76ac659686209dda9b176fc426aeae639e99b
Signed-off-by: Lijian Zhang <Lijian.Zhang@arm.com>

diff --git a/src/plugins/avf/input.c b/src/plugins/avf/input.c
index 4e4f116..85f97ca 100644 (file)
--- a/src/plugins/avf/input.c
+++ b/src/plugins/avf/input.c
@@ -253,6 +253,9 @@ avf_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 #ifdef CLIB_HAVE_VEC256
   u64x4 q1x4, or_q1x4 = { 0 };
   u64x4 dd_eop_mask4 = u64x4_splat (AVF_RXD_STATUS_DD | AVF_RXD_STATUS_EOP);
+#elif defined(CLIB_HAVE_VEC128)
+  u32x4 q1x4_lo, q1x4_hi, or_q1x4 = { 0 };
+  u32x4 dd_eop_mask4 = u32x4_splat (AVF_RXD_STATUS_DD | AVF_RXD_STATUS_EOP);
 #endif
 
   /* is there anything on the ring */
@@ -300,6 +303,29 @@ avf_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 
       or_q1x4 |= q1x4;
       u64x4_store_unaligned (q1x4, ptd->qw1s + n_rx_packets);
+#elif defined(CLIB_HAVE_VEC128)
+      if (n_rx_packets >= AVF_RX_VECTOR_SZ - 4 || next >= size - 4)
+       goto one_by_one;
+
+      q1x4_lo =
+       u32x4_gather ((void *) &d[0].qword[1], (void *) &d[1].qword[1],
+                     (void *) &d[2].qword[1], (void *) &d[3].qword[1]);
+
+      /* not all packets are ready or at least one of them is chained */
+      if (!u32x4_is_equal (q1x4_lo & dd_eop_mask4, dd_eop_mask4))
+       goto one_by_one;
+
+      q1x4_hi = u32x4_gather (
+       (void *) &d[0].qword[1] + 4, (void *) &d[1].qword[1] + 4,
+       (void *) &d[2].qword[1] + 4, (void *) &d[3].qword[1] + 4);
+
+      or_q1x4 |= q1x4_lo;
+      ptd->qw1s[n_rx_packets + 0] = (u64) q1x4_hi[0] << 32 | (u64) q1x4_lo[0];
+      ptd->qw1s[n_rx_packets + 1] = (u64) q1x4_hi[1] << 32 | (u64) q1x4_lo[1];
+      ptd->qw1s[n_rx_packets + 2] = (u64) q1x4_hi[2] << 32 | (u64) q1x4_lo[2];
+      ptd->qw1s[n_rx_packets + 3] = (u64) q1x4_hi[3] << 32 | (u64) q1x4_lo[3];
+#endif
+#if defined(CLIB_HAVE_VEC256) || defined(CLIB_HAVE_VEC128)
       vlib_buffer_copy_indices (bi, rxq->bufs + next, 4);
 
       /* next */
@@ -359,7 +385,7 @@ no_more_desc:
   rxq->next = next;
   rxq->n_enqueued -= n_rx_packets + n_tail_desc;
 
-#ifdef CLIB_HAVE_VEC256
+#if defined(CLIB_HAVE_VEC256) || defined(CLIB_HAVE_VEC128)
   or_qw1 |= or_q1x4[0] | or_q1x4[1] | or_q1x4[2] | or_q1x4[3];
 #endif