crypto: introduce async crypto infra

Type: feature

Signed-off-by: Damjan Marion <damarion@cisco.com>
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
Signed-off-by: Piotr Bronowski <piotrx.bronowski@intel.com>
Signed-off-by: Dariusz Kazimierski <dariuszx.kazimierski@intel.com>
Signed-off-by: Piotr Kleski <piotrx.kleski@intel.com>
Change-Id: I4c3fcccf55c36842b7b48aed260fef2802b5c54b

8 files changed, 1862 insertions, 708 deletions

diff --git a/src/vnet/ipsec/esp.h b/src/vnet/ipsec/esp.h
index b1736453b93..6c47bb05428 100644
--- a/src/vnet/ipsec/esp.h
+++ b/src/vnet/ipsec/esp.h
@@ -105,29 +105,101 @@ esp_seq_advance (ipsec_sa_t * sa)
   return 0;
 }
 
-always_inline void
-esp_aad_fill (vnet_crypto_op_t * op,
-	      const esp_header_t * esp, const ipsec_sa_t * sa)
+always_inline u16
+esp_aad_fill (u8 * data, const esp_header_t * esp, const ipsec_sa_t * sa)
 {
   esp_aead_t *aad;
 
-  aad = (esp_aead_t *) op->aad;
+  aad = (esp_aead_t *) data;
   aad->data[0] = esp->spi;
 
   if (ipsec_sa_is_set_USE_ESN (sa))
     {
       /* SPI, seq-hi, seq-low */
-      aad->data[1] = clib_host_to_net_u32 (sa->seq_hi);
+      aad->data[1] = (u32) clib_host_to_net_u32 (sa->seq_hi);
       aad->data[2] = esp->seq;
-      op->aad_len = 12;
+      return 12;
     }
   else
     {
       /* SPI, seq-low */
       aad->data[1] = esp->seq;
-      op->aad_len = 8;
+      return 8;
     }
 }
+
+/**
+ * The post data structure to for esp_encrypt/decrypt_inline to write to
+ * vib_buffer_t opaque unused field, and for post nodes to pick up after
+ * dequeue.
+ **/
+typedef struct
+{
+  union
+  {
+    struct
+    {
+      u8 icv_sz;
+      u8 iv_sz;
+      ipsec_sa_flags_t flags;
+      u32 sa_index;
+    };
+    u64 sa_data;
+  };
+
+  u32 seq;
+  i16 current_data;
+  i16 current_length;
+  u16 hdr_sz;
+  u16 is_chain;
+  u32 protect_index;
+} esp_decrypt_packet_data_t;
+
+STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 3 * sizeof (u64));
+
+/* we are forced to store the decrypt post data into 2 separate places -
+   vlib_opaque and opaque2. */
+typedef struct
+{
+  vlib_buffer_t *lb;
+  u32 free_buffer_index;
+  u8 icv_removed;
+} esp_decrypt_packet_data2_t;
+
+typedef union
+{
+  u16 next_index;
+  esp_decrypt_packet_data_t decrypt_data;
+} esp_post_data_t;
+
+STATIC_ASSERT (sizeof (esp_post_data_t) <=
+	       STRUCT_SIZE_OF (vnet_buffer_opaque_t, unused),
+	       "Custom meta-data too large for vnet_buffer_opaque_t");
+
+#define esp_post_data(b) \
+    ((esp_post_data_t *)((u8 *)((b)->opaque) \
+        + STRUCT_OFFSET_OF (vnet_buffer_opaque_t, unused)))
+
+STATIC_ASSERT (sizeof (esp_decrypt_packet_data2_t) <=
+	       STRUCT_SIZE_OF (vnet_buffer_opaque2_t, unused),
+	       "Custom meta-data too large for vnet_buffer_opaque2_t");
+
+#define esp_post_data2(b) \
+    ((esp_decrypt_packet_data2_t *)((u8 *)((b)->opaque2) \
+        + STRUCT_OFFSET_OF (vnet_buffer_opaque2_t, unused)))
+
+typedef struct
+{
+  /* esp post node index for async crypto */
+  u32 esp4_post_next;
+  u32 esp6_post_next;
+  u32 esp4_tun_post_next;
+  u32 esp6_tun_post_next;
+} esp_async_post_next_t;
+
+extern esp_async_post_next_t esp_encrypt_async_next;
+extern esp_async_post_next_t esp_decrypt_async_next;
+
 #endif /* __ESP_H__ */
 
 /*
diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c
index 0d14fe56740..b3c031e54af 100644
--- a/src/vnet/ipsec/esp_decrypt.c
+++ b/src/vnet/ipsec/esp_decrypt.c
@@ -32,7 +32,8 @@ _(DROP, "error-drop")                           \
 _(IP4_INPUT, "ip4-input-no-checksum")           \
 _(IP6_INPUT, "ip6-input")                       \
 _(L2_INPUT, "l2-input")                         \
-_(HANDOFF, "handoff")
+_(HANDOFF, "handoff")				\
+_(PENDING, "pending")
 
 #define _(v, s) ESP_DECRYPT_NEXT_##v,
 typedef enum
@@ -42,9 +43,23 @@ typedef enum
     ESP_DECRYPT_N_NEXT,
 } esp_decrypt_next_t;
 
+#define foreach_esp_decrypt_post_next                  \
+_(DROP, "error-drop")                                  \
+_(IP4_INPUT, "ip4-input-no-checksum")                  \
+_(IP6_INPUT, "ip6-input")                              \
+_(L2_INPUT, "l2-input")
+
+#define _(v, s) ESP_DECRYPT_POST_NEXT_##v,
+typedef enum
+{
+  foreach_esp_decrypt_post_next
+#undef _
+    ESP_DECRYPT_POST_N_NEXT,
+} esp_decrypt_post_next_t;
 
 #define foreach_esp_decrypt_error                               \
  _(RX_PKTS, "ESP pkts received")                                \
+ _(RX_POST_PKTS, "ESP-POST pkts received")                      \
  _(DECRYPTION_FAILED, "ESP decryption failed")                  \
  _(INTEG_ERROR, "Integrity check failed")                       \
  _(CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \
@@ -96,32 +111,6 @@ format_esp_decrypt_trace (u8 * s, va_list * args)
   return s;
 }
 
-typedef struct
-{
-  vlib_buffer_t *lb;
-  union
-  {
-    struct
-    {
-      u8 icv_sz;
-      u8 iv_sz;
-      ipsec_sa_flags_t flags;
-      u32 sa_index;
-    };
-    u64 sa_data;
-  };
-
-  u32 seq;
-  u32 free_buffer_index;
-  i16 current_data;
-  i16 current_length;
-  u16 hdr_sz;
-  u8 icv_removed;
-  u8 __unused;
-} esp_decrypt_packet_data_t;
-
-STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 4 * sizeof (u64));
-
 #define ESP_ENCRYPT_PD_F_FD_TRANSPORT (1 << 2)
 
 static_always_inline void
@@ -214,10 +203,10 @@ esp_remove_tail (vlib_main_t * vm, vlib_buffer_t * b, vlib_buffer_t * last,
    return pointer to it */
 static_always_inline u8 *
 esp_move_icv (vlib_main_t * vm, vlib_buffer_t * first,
-	      esp_decrypt_packet_data_t * pd, u16 icv_sz, u16 * dif)
+	      esp_decrypt_packet_data2_t * pd2, u16 icv_sz, u16 * dif)
 {
   vlib_buffer_t *before_last, *bp;
-  u16 last_sz = pd->lb->current_length;
+  u16 last_sz = pd2->lb->current_length;
   u16 first_sz = icv_sz - last_sz;
 
   bp = before_last = first;
@@ -227,42 +216,43 @@ esp_move_icv (vlib_main_t * vm, vlib_buffer_t * first,
       bp = vlib_get_buffer (vm, bp->next_buffer);
     }
 
-  u8 *lb_curr = vlib_buffer_get_current (pd->lb);
+  u8 *lb_curr = vlib_buffer_get_current (pd2->lb);
   memmove (lb_curr + first_sz, lb_curr, last_sz);
   clib_memcpy_fast (lb_curr, vlib_buffer_get_tail (before_last) - first_sz,
 		    first_sz);
   before_last->current_length -= first_sz;
+  clib_memset (vlib_buffer_get_tail (before_last), 0, first_sz);
   if (dif)
     dif[0] = first_sz;
-  pd->lb = before_last;
-  pd->icv_removed = 1;
-  pd->free_buffer_index = before_last->next_buffer;
+  pd2->lb = before_last;
+  pd2->icv_removed = 1;
+  pd2->free_buffer_index = before_last->next_buffer;
   before_last->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
   return lb_curr;
 }
 
-static_always_inline int
+static_always_inline i16
 esp_insert_esn (vlib_main_t * vm, ipsec_sa_t * sa,
-		esp_decrypt_packet_data_t * pd, vnet_crypto_op_t * op,
-		u16 * len, vlib_buffer_t * b, u8 * payload)
+		esp_decrypt_packet_data2_t * pd2, u32 * data_len,
+		u8 ** digest, u16 * len, vlib_buffer_t * b, u8 * payload)
 {
   if (!ipsec_sa_is_set_USE_ESN (sa))
-    return 1;
+    return 0;
 
   /* shift ICV by 4 bytes to insert ESN */
   u32 seq_hi = clib_host_to_net_u32 (sa->seq_hi);
   u8 tmp[ESP_MAX_ICV_SIZE], sz = sizeof (sa->seq_hi);
 
-  if (pd->icv_removed)
+  if (pd2->icv_removed)
     {
-      u16 space_left = vlib_buffer_space_left_at_end (vm, pd->lb);
+      u16 space_left = vlib_buffer_space_left_at_end (vm, pd2->lb);
       if (space_left >= sz)
 	{
-	  clib_memcpy_fast (vlib_buffer_get_tail (pd->lb), &seq_hi, sz);
-	  op->len += sz;
+	  clib_memcpy_fast (vlib_buffer_get_tail (pd2->lb), &seq_hi, sz);
+	  *data_len += sz;
 	}
       else
-	return 0;
+	return sz;
 
       len[0] = b->current_length;
     }
@@ -271,39 +261,39 @@ esp_insert_esn (vlib_main_t * vm, ipsec_sa_t * sa,
       clib_memcpy_fast (tmp, payload + len[0], ESP_MAX_ICV_SIZE);
       clib_memcpy_fast (payload + len[0], &seq_hi, sz);
       clib_memcpy_fast (payload + len[0] + sz, tmp, ESP_MAX_ICV_SIZE);
-      op->len += sz;
-      op->digest += sz;
+      *data_len += sz;
+      *digest += sz;
     }
-  return 1;
+  return sz;
 }
 
 static_always_inline u8 *
 esp_move_icv_esn (vlib_main_t * vm, vlib_buffer_t * first,
-		  esp_decrypt_packet_data_t * pd, u16 icv_sz, ipsec_sa_t * sa,
-		  u8 * extra_esn, vnet_crypto_op_t * op)
+		  esp_decrypt_packet_data2_t * pd2, u16 icv_sz,
+		  ipsec_sa_t * sa, u8 * extra_esn, u32 * len)
 {
   u16 dif = 0;
-  u8 *digest = esp_move_icv (vm, first, pd, icv_sz, &dif);
+  u8 *digest = esp_move_icv (vm, first, pd2, icv_sz, &dif);
   if (dif)
-    op->len -= dif;
+    *len -= dif;
 
   if (ipsec_sa_is_set_USE_ESN (sa))
     {
       u8 sz = sizeof (sa->seq_hi);
       u32 seq_hi = clib_host_to_net_u32 (sa->seq_hi);
-      u16 space_left = vlib_buffer_space_left_at_end (vm, pd->lb);
+      u16 space_left = vlib_buffer_space_left_at_end (vm, pd2->lb);
 
       if (space_left >= sz)
 	{
-	  clib_memcpy_fast (vlib_buffer_get_tail (pd->lb), &seq_hi, sz);
-	  op->len += sz;
+	  clib_memcpy_fast (vlib_buffer_get_tail (pd2->lb), &seq_hi, sz);
+	  *len += sz;
 	}
       else
 	{
 	  /* no space for ESN at the tail, use the next buffer
 	   * (with ICV data) */
-	  ASSERT (pd->icv_removed);
-	  vlib_buffer_t *tmp = vlib_get_buffer (vm, pd->free_buffer_index);
+	  ASSERT (pd2->icv_removed);
+	  vlib_buffer_t *tmp = vlib_get_buffer (vm, pd2->free_buffer_index);
 	  clib_memcpy_fast (vlib_buffer_get_current (tmp) - sz, &seq_hi, sz);
 	  extra_esn[0] = 1;
 	}
@@ -311,10 +301,735 @@ esp_move_icv_esn (vlib_main_t * vm, vlib_buffer_t * first,
   return digest;
 }
 
+static_always_inline int
+esp_decrypt_chain_integ (vlib_main_t * vm, ipsec_per_thread_data_t * ptd,
+			 esp_decrypt_packet_data2_t * pd2,
+			 ipsec_sa_t * sa0, vlib_buffer_t * b, u8 icv_sz,
+			 u8 * start_src, u32 start_len,
+			 u8 ** digest, u16 * n_ch, u32 * integ_total_len)
+{
+  vnet_crypto_op_chunk_t *ch;
+  vlib_buffer_t *cb = vlib_get_buffer (vm, b->next_buffer);
+  u16 n_chunks = 1;
+  u32 total_len;
+  vec_add2 (ptd->chunks, ch, 1);
+  total_len = ch->len = start_len;
+  ch->src = start_src;
+
+  while (1)
+    {
+      vec_add2 (ptd->chunks, ch, 1);
+      n_chunks += 1;
+      ch->src = vlib_buffer_get_current (cb);
+      if (pd2->lb == cb)
+	{
+	  if (pd2->icv_removed)
+	    ch->len = cb->current_length;
+	  else
+	    ch->len = cb->current_length - icv_sz;
+	  if (ipsec_sa_is_set_USE_ESN (sa0))
+	    {
+	      u32 seq_hi = clib_host_to_net_u32 (sa0->seq_hi);
+	      u8 tmp[ESP_MAX_ICV_SIZE], sz = sizeof (sa0->seq_hi);
+	      u8 *esn;
+	      vlib_buffer_t *tmp_b;
+	      u16 space_left = vlib_buffer_space_left_at_end (vm, pd2->lb);
+	      if (space_left < sz)
+		{
+		  if (pd2->icv_removed)
+		    {
+		      /* use pre-data area from the last bufer
+		         that was removed from the chain */
+		      tmp_b = vlib_get_buffer (vm, pd2->free_buffer_index);
+		      esn = tmp_b->data - sz;
+		    }
+		  else
+		    {
+		      /* no space, need to allocate new buffer */
+		      u32 tmp_bi = 0;
+		      if (vlib_buffer_alloc (vm, &tmp_bi, 1) != 1)
+			return -1;
+		      tmp_b = vlib_get_buffer (vm, tmp_bi);
+		      esn = tmp_b->data;
+		      pd2->free_buffer_index = tmp_bi;
+		    }
+		  clib_memcpy_fast (esn, &seq_hi, sz);
+
+		  vec_add2 (ptd->chunks, ch, 1);
+		  n_chunks += 1;
+		  ch->src = esn;
+		  ch->len = sz;
+		}
+	      else
+		{
+		  if (pd2->icv_removed)
+		    {
+		      clib_memcpy_fast (vlib_buffer_get_tail
+					(pd2->lb), &seq_hi, sz);
+		    }
+		  else
+		    {
+		      clib_memcpy_fast (tmp, *digest, ESP_MAX_ICV_SIZE);
+		      clib_memcpy_fast (*digest, &seq_hi, sz);
+		      clib_memcpy_fast (*digest + sz, tmp, ESP_MAX_ICV_SIZE);
+		      *digest += sz;
+		    }
+		  ch->len += sz;
+		}
+	    }
+	  total_len += ch->len;
+	  break;
+	}
+      else
+	total_len += ch->len = cb->current_length;
+
+      if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
+	break;
+
+      cb = vlib_get_buffer (vm, cb->next_buffer);
+    }
+
+  if (n_ch)
+    *n_ch = n_chunks;
+  if (integ_total_len)
+    *integ_total_len = total_len;
+
+  return 0;
+}
+
+static_always_inline u32
+esp_decrypt_chain_crypto (vlib_main_t * vm, ipsec_per_thread_data_t * ptd,
+			  esp_decrypt_packet_data2_t * pd2,
+			  ipsec_sa_t * sa0, vlib_buffer_t * b, u8 icv_sz,
+			  u8 * start, u32 start_len, u8 ** tag, u16 * n_ch)
+{
+  vnet_crypto_op_chunk_t *ch;
+  vlib_buffer_t *cb = b;
+  u16 n_chunks = 1;
+  u32 total_len;
+  vec_add2 (ptd->chunks, ch, 1);
+  total_len = ch->len = start_len;
+  ch->src = ch->dst = start;
+  cb = vlib_get_buffer (vm, cb->next_buffer);
+  n_chunks = 1;
+
+  while (1)
+    {
+      vec_add2 (ptd->chunks, ch, 1);
+      n_chunks += 1;
+      ch->src = ch->dst = vlib_buffer_get_current (cb);
+      if (pd2->lb == cb)
+	{
+	  if (ipsec_sa_is_set_IS_AEAD (sa0))
+	    {
+	      if (pd2->lb->current_length < icv_sz)
+		{
+		  u16 dif = 0;
+		  *tag = esp_move_icv (vm, b, pd2, icv_sz, &dif);
+
+		  /* this chunk does not contain crypto data */
+		  n_chunks -= 1;
+		  /* and fix previous chunk's length as it might have
+		     been changed */
+		  ASSERT (n_chunks > 0);
+		  if (pd2->lb == b)
+		    {
+		      total_len -= dif;
+		      ch[-1].len -= dif;
+		    }
+		  else
+		    {
+		      total_len = total_len + pd2->lb->current_length -
+			ch[-1].len;
+		      ch[-1].len = pd2->lb->current_length;
+		    }
+		  break;
+		}
+	      else
+		*tag = vlib_buffer_get_tail (pd2->lb) - icv_sz;
+	    }
+
+	  if (pd2->icv_removed)
+	    total_len += ch->len = cb->current_length;
+	  else
+	    total_len += ch->len = cb->current_length - icv_sz;
+	}
+      else
+	total_len += ch->len = cb->current_length;
+
+      if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
+	break;
+
+      cb = vlib_get_buffer (vm, cb->next_buffer);
+    }
+
+  if (n_ch)
+    *n_ch = n_chunks;
+
+  return total_len;
+}
+
+static_always_inline void
+esp_decrypt_prepare_sync_op (vlib_main_t * vm, vlib_node_runtime_t * node,
+			     ipsec_per_thread_data_t * ptd,
+			     vnet_crypto_op_t *** crypto_ops,
+			     vnet_crypto_op_t *** integ_ops,
+			     vnet_crypto_op_t * op,
+			     ipsec_sa_t * sa0, u8 * payload,
+			     u16 len, u8 icv_sz, u8 iv_sz,
+			     esp_decrypt_packet_data_t * pd,
+			     esp_decrypt_packet_data2_t * pd2,
+			     vlib_buffer_t * b, u16 * next, u32 index)
+{
+  const u8 esp_sz = sizeof (esp_header_t);
+
+  if (PREDICT_TRUE (sa0->integ_op_id != VNET_CRYPTO_OP_NONE))
+    {
+      vnet_crypto_op_init (op, sa0->integ_op_id);
+      op->key_index = sa0->integ_key_index;
+      op->src = payload;
+      op->flags = VNET_CRYPTO_OP_FLAG_HMAC_CHECK;
+      op->user_data = index;
+      op->digest = payload + len;
+      op->digest_len = icv_sz;
+      op->len = len;
+
+      if (pd->is_chain)
+	{
+	  /* buffer is chained */
+	  op->len = pd->current_length;
+
+	  /* special case when ICV is splitted and needs to be reassembled
+	   * first -> move it to the last buffer. Also take into account
+	   * that ESN needs to be added after encrypted data and may or
+	   * may not fit in the tail.*/
+	  if (pd2->lb->current_length < icv_sz)
+	    {
+	      u8 extra_esn = 0;
+	      op->digest =
+		esp_move_icv_esn (vm, b, pd2, icv_sz, sa0,
+				  &extra_esn, &op->len);
+
+	      if (extra_esn)
+		{
+		  /* esn is in the last buffer, that was unlinked from
+		   * the chain */
+		  op->len = b->current_length;
+		}
+	      else
+		{
+		  if (pd2->lb == b)
+		    {
+		      /* we now have a single buffer of crypto data, adjust
+		       * the length (second buffer contains only ICV) */
+		      *integ_ops = &ptd->integ_ops;
+		      *crypto_ops = &ptd->crypto_ops;
+		      len = b->current_length;
+		      goto out;
+		    }
+		}
+	    }
+	  else
+	    op->digest = vlib_buffer_get_tail (pd2->lb) - icv_sz;
+
+	  op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+	  op->chunk_index = vec_len (ptd->chunks);
+	  if (esp_decrypt_chain_integ (vm, ptd, pd2, sa0, b, icv_sz,
+				       payload, pd->current_length,
+				       &op->digest, &op->n_chunks, 0) < 0)
+	    {
+	      b->error = node->errors[ESP_DECRYPT_ERROR_NO_BUFFERS];
+	      next[0] = ESP_DECRYPT_NEXT_DROP;
+	      return;
+	    }
+	}
+      else
+	esp_insert_esn (vm, sa0, pd2, &op->len, &op->digest, &len, b,
+			payload);
+    out:
+      vec_add_aligned (*(integ_ops[0]), op, 1, CLIB_CACHE_LINE_BYTES);
+    }
+
+  payload += esp_sz;
+  len -= esp_sz;
+
+  if (sa0->crypto_dec_op_id != VNET_CRYPTO_OP_NONE)
+    {
+      vnet_crypto_op_init (op, sa0->crypto_dec_op_id);
+      op->key_index = sa0->crypto_key_index;
+      op->iv = payload;
+
+      if (ipsec_sa_is_set_IS_AEAD (sa0))
+	{
+	  esp_header_t *esp0;
+	  esp_aead_t *aad;
+	  u8 *scratch;
+
+	  /*
+	   * construct the AAD and the nonce (Salt || IV) in a scratch
+	   * space in front of the IP header.
+	   */
+	  scratch = payload - esp_sz;
+	  esp0 = (esp_header_t *) (scratch);
+
+	  scratch -= (sizeof (*aad) + pd->hdr_sz);
+	  op->aad = scratch;
+
+	  op->aad_len = esp_aad_fill (op->aad, esp0, sa0);
+
+	  /*
+	   * we don't need to refer to the ESP header anymore so we
+	   * can overwrite it with the salt and use the IV where it is
+	   * to form the nonce = (Salt + IV)
+	   */
+	  op->iv -= sizeof (sa0->salt);
+	  clib_memcpy_fast (op->iv, &sa0->salt, sizeof (sa0->salt));
+
+	  op->tag = payload + len;
+	  op->tag_len = 16;
+	}
+      op->src = op->dst = payload += iv_sz;
+      op->len = len - iv_sz;
+      op->user_data = index;
+
+      if (pd->is_chain && (pd2->lb != b))
+	{
+	  /* buffer is chained */
+	  op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+	  op->chunk_index = vec_len (ptd->chunks);
+	  esp_decrypt_chain_crypto (vm, ptd, pd2, sa0, b, icv_sz,
+				    payload, len - pd->iv_sz + pd->icv_sz,
+				    &op->tag, &op->n_chunks);
+	}
+
+      vec_add_aligned (*(crypto_ops[0]), op, 1, CLIB_CACHE_LINE_BYTES);
+    }
+}
+
+static_always_inline int
+esp_decrypt_prepare_async_frame (vlib_main_t * vm,
+				 vlib_node_runtime_t * node,
+				 ipsec_per_thread_data_t * ptd,
+				 vnet_crypto_async_frame_t ** f,
+				 ipsec_sa_t * sa0, u8 * payload, u16 len,
+				 u8 icv_sz, u8 iv_sz,
+				 esp_decrypt_packet_data_t * pd,
+				 esp_decrypt_packet_data2_t * pd2, u32 bi,
+				 vlib_buffer_t * b, u16 * next,
+				 u16 async_next)
+{
+  const u8 esp_sz = sizeof (esp_header_t);
+  u32 current_protect_index = vnet_buffer (b)->ipsec.protect_index;
+  esp_decrypt_packet_data_t *async_pd = &(esp_post_data (b))->decrypt_data;
+  esp_decrypt_packet_data2_t *async_pd2 = esp_post_data2 (b);
+  u8 *tag = payload + len, *iv = payload + esp_sz, *aad = 0;
+  u32 key_index;
+  u32 crypto_len, integ_len = 0;
+  i16 crypto_start_offset, integ_start_offset = 0;
+  u8 flags = 0;
+
+  if (!ipsec_sa_is_set_IS_AEAD (sa0))
+    {
+      /* linked algs */
+      key_index = sa0->linked_key_index;
+      integ_start_offset = payload - b->data;
+      integ_len = len;
+
+      if (pd->is_chain)
+	{
+	  /* buffer is chained */
+	  integ_len = pd->current_length;
+
+	  /* special case when ICV is splitted and needs to be reassembled
+	   * first -> move it to the last buffer. Also take into account
+	   * that ESN needs to be added after encrypted data and may or
+	   * may not fit in the tail.*/
+	  if (pd2->lb->current_length < icv_sz)
+	    {
+	      u8 extra_esn = 0;
+	      tag = esp_move_icv_esn (vm, b, pd2, icv_sz, sa0,
+				      &extra_esn, &integ_len);
+
+	      if (extra_esn)
+		{
+		  /* esn is in the last buffer, that was unlinked from
+		   * the chain */
+		  integ_len = b->current_length;
+		}
+	      else
+		{
+		  if (pd2->lb == b)
+		    {
+		      /* we now have a single buffer of crypto data, adjust
+		       * the length (second buffer contains only ICV) */
+		      len = b->current_length;
+		      goto out;
+		    }
+		}
+	    }
+	  else
+	    tag = vlib_buffer_get_tail (pd2->lb) - icv_sz;
+
+	  flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+	  if (esp_decrypt_chain_integ (vm, ptd, pd2, sa0, b, icv_sz, payload,
+				       pd->current_length, &tag,
+				       0, &integ_len) < 0)
+	    {
+	      /* allocate buffer failed, will not add to frame and drop */
+	      b->error = node->errors[ESP_DECRYPT_ERROR_NO_BUFFERS];
+	      next[0] = ESP_DECRYPT_NEXT_DROP;
+	      return 0;
+	    }
+	}
+      else
+	esp_insert_esn (vm, sa0, pd2, &integ_len, &tag, &len, b, payload);
+    }
+  else
+    key_index = sa0->crypto_key_index;
+
+out:
+  /* crypto */
+  payload += esp_sz;
+  len -= esp_sz;
+  iv = payload;
+
+  if (ipsec_sa_is_set_IS_AEAD (sa0))
+    {
+      esp_header_t *esp0;
+      u8 *scratch;
+
+      /*
+       * construct the AAD and the nonce (Salt || IV) in a scratch
+       * space in front of the IP header.
+       */
+      scratch = payload - esp_sz;
+      esp0 = (esp_header_t *) (scratch);
+
+      scratch -= (sizeof (esp_aead_t) + pd->hdr_sz);
+      aad = scratch;
+
+      esp_aad_fill (aad, esp0, sa0);
+
+      /*
+       * we don't need to refer to the ESP header anymore so we
+       * can overwrite it with the salt and use the IV where it is
+       * to form the nonce = (Salt + IV)
+       */
+      iv -= sizeof (sa0->salt);
+      clib_memcpy_fast (iv, &sa0->salt, sizeof (sa0->salt));
+
+      tag = payload + len;
+    }
+
+  crypto_start_offset = (payload += iv_sz) - b->data;
+  crypto_len = len - iv_sz;
+
+  if (pd->is_chain && (pd2->lb != b))
+    {
+      /* buffer is chained */
+      flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+
+      crypto_len = esp_decrypt_chain_crypto (vm, ptd, pd2, sa0, b, icv_sz,
+					     payload,
+					     len - pd->iv_sz + pd->icv_sz,
+					     &tag, 0);
+    }
+
+  *async_pd = *pd;
+  *async_pd2 = *pd2;
+  pd->protect_index = current_protect_index;
+  next[0] = ESP_DECRYPT_NEXT_PENDING;
+
+  /* for AEAD integ_len - crypto_len will be negative, it is ok since it
+   * is ignored by the engine. */
+  return vnet_crypto_async_add_to_frame (vm, f, key_index, crypto_len,
+					 integ_len - crypto_len,
+					 crypto_start_offset,
+					 integ_start_offset,
+					 bi, async_next, iv, tag, aad, flags);
+}
+
+static_always_inline void
+esp_decrypt_post_crypto (vlib_main_t * vm, vlib_node_runtime_t * node,
+			 esp_decrypt_packet_data_t * pd,
+			 esp_decrypt_packet_data2_t * pd2, vlib_buffer_t * b,
+			 u16 * next, int is_ip6, int is_tun, int is_async)
+{
+  ipsec_main_t *im = &ipsec_main;
+  ipsec_sa_t *sa0 = vec_elt_at_index (im->sad, pd->sa_index);
+  vlib_buffer_t *lb = b;
+  const u8 esp_sz = sizeof (esp_header_t);
+  const u8 tun_flags = IPSEC_SA_FLAG_IS_TUNNEL | IPSEC_SA_FLAG_IS_TUNNEL_V6;
+  u8 pad_length = 0, next_header = 0;
+  u16 icv_sz;
+
+  /*
+   * redo the anti-reply check
+   * in this frame say we have sequence numbers, s, s+1, s+1, s+1
+   * and s and s+1 are in the window. When we did the anti-replay
+   * check above we did so against the state of the window (W),
+   * after packet s-1. So each of the packets in the sequence will be
+   * accepted.
+   * This time s will be cheked against Ws-1, s+1 chceked against Ws
+   * (i.e. the window state is updated/advnaced)
+   * so this time the successive s+! packet will be dropped.
+   * This is a consequence of batching the decrypts. If the
+   * check-dcrypt-advance process was done for each packet it would
+   * be fine. But we batch the decrypts because it's much more efficient
+   * to do so in SW and if we offload to HW and the process is async.
+   *
+   * You're probably thinking, but this means an attacker can send the
+   * above sequence and cause VPP to perform decrpyts that will fail,
+   * and that's true. But if the attacker can determine s (a valid
+   * sequence number in the window) which is non-trivial, it can generate
+   * a sequence s, s+1, s+2, s+3, ... s+n and nothing will prevent any
+   * implementation, sequential or batching, from decrypting these.
+   */
+  if (ipsec_sa_anti_replay_check (sa0, pd->seq))
+    {
+      b->error = node->errors[ESP_DECRYPT_ERROR_REPLAY];
+      next[0] = ESP_DECRYPT_NEXT_DROP;
+      return;
+    }
+
+  ipsec_sa_anti_replay_advance (sa0, pd->seq);
+
+  if (pd->is_chain)
+    {
+      lb = pd2->lb;
+      icv_sz = pd2->icv_removed ? 0 : pd->icv_sz;
+      if (pd2->free_buffer_index)
+	{
+	  vlib_buffer_free_one (vm, pd2->free_buffer_index);
+	  lb->next_buffer = 0;
+	}
+      if (lb->current_length < sizeof (esp_footer_t) + icv_sz)
+	{
+	  /* esp footer is either splitted in two buffers or in the before
+	   * last buffer */
+
+	  vlib_buffer_t *before_last = b, *bp = b;
+	  while (bp->flags & VLIB_BUFFER_NEXT_PRESENT)
+	    {
+	      before_last = bp;
+	      bp = vlib_get_buffer (vm, bp->next_buffer);
+	    }
+	  u8 *bt = vlib_buffer_get_tail (before_last);
+
+	  if (lb->current_length == icv_sz)
+	    {
+	      esp_footer_t *f = (esp_footer_t *) (bt - sizeof (*f));
+	      pad_length = f->pad_length;
+	      next_header = f->next_header;
+	    }
+	  else
+	    {
+	      pad_length = (bt - 1)[0];
+	      next_header = ((u8 *) vlib_buffer_get_current (lb))[0];
+	    }
+	}
+      else
+	{
+	  esp_footer_t *f =
+	    (esp_footer_t *) (lb->data + lb->current_data +
+			      lb->current_length - sizeof (esp_footer_t) -
+			      icv_sz);
+	  pad_length = f->pad_length;
+	  next_header = f->next_header;
+	}
+    }
+  else
+    {
+      icv_sz = pd->icv_sz;
+      esp_footer_t *f =
+	(esp_footer_t *) (lb->data + lb->current_data + lb->current_length -
+			  sizeof (esp_footer_t) - icv_sz);
+      pad_length = f->pad_length;
+      next_header = f->next_header;
+    }
+
+  u16 adv = pd->iv_sz + esp_sz;
+  u16 tail = sizeof (esp_footer_t) + pad_length + icv_sz;
+  u16 tail_orig = sizeof (esp_footer_t) + pad_length + pd->icv_sz;
+  b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
+
+  if ((pd->flags & tun_flags) == 0 && !is_tun)	/* transport mode */
+    {
+      u8 udp_sz = (is_ip6 == 0 && pd->flags & IPSEC_SA_FLAG_UDP_ENCAP) ?
+	sizeof (udp_header_t) : 0;
+      u16 ip_hdr_sz = pd->hdr_sz - udp_sz;
+      u8 *old_ip = b->data + pd->current_data - ip_hdr_sz - udp_sz;
+      u8 *ip = old_ip + adv + udp_sz;
+
+      if (is_ip6 && ip_hdr_sz > 64)
+	memmove (ip, old_ip, ip_hdr_sz);
+      else
+	clib_memcpy_le64 (ip, old_ip, ip_hdr_sz);
+
+      b->current_data = pd->current_data + adv - ip_hdr_sz;
+      b->current_length += ip_hdr_sz - adv;
+      esp_remove_tail (vm, b, lb, tail);
+
+      if (is_ip6)
+	{
+	  ip6_header_t *ip6 = (ip6_header_t *) ip;
+	  u16 len = clib_net_to_host_u16 (ip6->payload_length);
+	  len -= adv + tail_orig;
+	  ip6->payload_length = clib_host_to_net_u16 (len);
+	  ip6->protocol = next_header;
+	  next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
+	}
+      else
+	{
+	  ip4_header_t *ip4 = (ip4_header_t *) ip;
+	  ip_csum_t sum = ip4->checksum;
+	  u16 len = clib_net_to_host_u16 (ip4->length);
+	  len = clib_host_to_net_u16 (len - adv - tail_orig - udp_sz);
+	  sum = ip_csum_update (sum, ip4->protocol, next_header,
+				ip4_header_t, protocol);
+	  sum = ip_csum_update (sum, ip4->length, len, ip4_header_t, length);
+	  ip4->checksum = ip_csum_fold (sum);
+	  ip4->protocol = next_header;
+	  ip4->length = len;
+	  next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
+	}
+    }
+  else
+    {
+      if (PREDICT_TRUE (next_header == IP_PROTOCOL_IP_IN_IP))
+	{
+	  next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
+	  b->current_data = pd->current_data + adv;
+	  b->current_length = pd->current_length - adv;
+	  esp_remove_tail (vm, b, lb, tail);
+	}
+      else if (next_header == IP_PROTOCOL_IPV6)
+	{
+	  next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
+	  b->current_data = pd->current_data + adv;
+	  b->current_length = pd->current_length - adv;
+	  esp_remove_tail (vm, b, lb, tail);
+	}
+      else
+	{
+	  if (is_tun && next_header == IP_PROTOCOL_GRE)
+	    {
+	      gre_header_t *gre;
+
+	      b->current_data = pd->current_data + adv;
+	      b->current_length = pd->current_length - adv - tail;
+
+	      gre = vlib_buffer_get_current (b);
+
+	      vlib_buffer_advance (b, sizeof (*gre));
+
+	      switch (clib_net_to_host_u16 (gre->protocol))
+		{
+		case GRE_PROTOCOL_teb:
+		  vnet_update_l2_len (b);
+		  next[0] = ESP_DECRYPT_NEXT_L2_INPUT;
+		  break;
+		case GRE_PROTOCOL_ip4:
+		  next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
+		  break;
+		case GRE_PROTOCOL_ip6:
+		  next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
+		  break;
+		default:
+		  b->error = node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD];
+		  next[0] = ESP_DECRYPT_NEXT_DROP;
+		  break;
+		}
+	    }
+	  else
+	    {
+	      next[0] = ESP_DECRYPT_NEXT_DROP;
+	      b->error = node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD];
+	      return;
+	    }
+	}
+      if (is_tun)
+	{
+	  if (ipsec_sa_is_set_IS_PROTECT (sa0))
+	    {
+	      /*
+	       * There are two encap possibilities
+	       * 1) the tunnel and ths SA are prodiving encap, i.e. it's
+	       *   MAC | SA-IP | TUN-IP | ESP | PAYLOAD
+	       * implying the SA is in tunnel mode (on a tunnel interface)
+	       * 2) only the tunnel provides encap
+	       *   MAC | TUN-IP | ESP | PAYLOAD
+	       * implying the SA is in transport mode.
+	       *
+	       * For 2) we need only strip the tunnel encap and we're good.
+	       *  since the tunnel and crypto ecnap (int the tun=protect
+	       * object) are the same and we verified above that these match
+	       * for 1) we need to strip the SA-IP outer headers, to
+	       * reveal the tunnel IP and then check that this matches
+	       * the configured tunnel.
+	       */
+	      const ipsec_tun_protect_t *itp;
+
+	      if (is_async)
+		itp = ipsec_tun_protect_get (pd->protect_index);
+	      else
+		itp =
+		  ipsec_tun_protect_get (vnet_buffer (b)->
+					 ipsec.protect_index);
+
+	      if (PREDICT_TRUE (next_header == IP_PROTOCOL_IP_IN_IP))
+		{
+		  const ip4_header_t *ip4;
+
+		  ip4 = vlib_buffer_get_current (b);
+
+		  if (!ip46_address_is_equal_v4 (&itp->itp_tun.src,
+						 &ip4->dst_address) ||
+		      !ip46_address_is_equal_v4 (&itp->itp_tun.dst,
+						 &ip4->src_address))
+		    {
+		      next[0] = ESP_DECRYPT_NEXT_DROP;
+		      b->error = node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO];
+		    }
+		}
+	      else if (next_header == IP_PROTOCOL_IPV6)
+		{
+		  const ip6_header_t *ip6;
+
+		  ip6 = vlib_buffer_get_current (b);
+
+		  if (!ip46_address_is_equal_v6 (&itp->itp_tun.src,
+						 &ip6->dst_address) ||
+		      !ip46_address_is_equal_v6 (&itp->itp_tun.dst,
+						 &ip6->src_address))
+		    {
+		      next[0] = ESP_DECRYPT_NEXT_DROP;
+		      b->error = node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO];
+		    }
+		}
+	    }
+	}
+    }
+}
+
+/* when submitting a frame is failed, drop all buffers in the frame */
+static_always_inline void
+esp_async_recycle_failed_submit (vnet_crypto_async_frame_t * f,
+				 vlib_buffer_t ** b, u16 * next)
+{
+  u32 n_drop = f->n_elts;
+  while (--n_drop)
+    {
+      (b - n_drop)[0]->error = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR;
+      (next - n_drop)[0] = ESP_DECRYPT_NEXT_DROP;
+    }
+  vnet_crypto_async_reset_frame (f);
+}
+
 always_inline uword
 esp_decrypt_inline (vlib_main_t * vm,
 		    vlib_node_runtime_t * node, vlib_frame_t * from_frame,
-		    int is_ip6, int is_tun)
+		    int is_ip6, int is_tun, u16 async_next)
 {
   ipsec_main_t *im = &ipsec_main;
   u32 thread_index = vm->thread_index;
@@ -325,20 +1040,26 @@ esp_decrypt_inline (vlib_main_t * vm,
   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
   u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
   esp_decrypt_packet_data_t pkt_data[VLIB_FRAME_SIZE], *pd = pkt_data;
+  esp_decrypt_packet_data2_t pkt_data2[VLIB_FRAME_SIZE], *pd2 = pkt_data2;
   esp_decrypt_packet_data_t cpd = { };
   u32 current_sa_index = ~0, current_sa_bytes = 0, current_sa_pkts = 0;
   const u8 esp_sz = sizeof (esp_header_t);
   ipsec_sa_t *sa0 = 0;
   vnet_crypto_op_t _op, *op = &_op;
-  vnet_crypto_op_chunk_t *ch;
   vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops;
   vnet_crypto_op_t **integ_ops = &ptd->integ_ops;
+  vnet_crypto_async_frame_t *async_frame = 0;
+  int is_async = im->async_mode;
+  vnet_crypto_async_op_id_t last_async_op = ~0;
 
   vlib_get_buffers (vm, from, b, n_left);
-  vec_reset_length (ptd->crypto_ops);
-  vec_reset_length (ptd->integ_ops);
-  vec_reset_length (ptd->chained_crypto_ops);
-  vec_reset_length (ptd->chained_integ_ops);
+  if (!is_async)
+    {
+      vec_reset_length (ptd->crypto_ops);
+      vec_reset_length (ptd->integ_ops);
+      vec_reset_length (ptd->chained_crypto_ops);
+      vec_reset_length (ptd->chained_integ_ops);
+    }
   vec_reset_length (ptd->chunks);
   clib_memset_u16 (nexts, -1, n_left);
 
@@ -379,6 +1100,19 @@ esp_decrypt_inline (vlib_main_t * vm,
 	  cpd.iv_sz = sa0->crypto_iv_size;
 	  cpd.flags = sa0->flags;
 	  cpd.sa_index = current_sa_index;
+
+	  /* submit frame when op_id is different then the old one */
+	  if (is_async && last_async_op != sa0->crypto_async_dec_op_id)
+	    {
+	      if (async_frame && async_frame->n_elts)
+		{
+		  if (vnet_crypto_async_submit_open_frame (vm, async_frame))
+		    esp_async_recycle_failed_submit (async_frame, b, next);
+		}
+	      async_frame =
+		vnet_crypto_async_get_frame (vm, sa0->crypto_async_dec_op_id);
+	      last_async_op = sa0->crypto_async_dec_op_id;
+	    }
 	}
 
       if (PREDICT_FALSE (~0 == sa0->decrypt_thread_index))
@@ -402,19 +1136,22 @@ esp_decrypt_inline (vlib_main_t * vm,
       pd->hdr_sz = pd->current_data - vnet_buffer (b[0])->l3_hdr_offset;
       payload = b[0]->data + pd->current_data;
       pd->seq = clib_host_to_net_u32 (((esp_header_t *) payload)->seq);
-      pd->free_buffer_index = 0;
-      pd->icv_removed = 0;
+      pd->is_chain = 0;
+      pd2->lb = b[0];
+      pd2->free_buffer_index = 0;
+      pd2->icv_removed = 0;
 
-      pd->lb = b[0];
       if (n_bufs > 1)
 	{
+	  pd->is_chain = 1;
 	  /* find last buffer in the chain */
-	  while (pd->lb->flags & VLIB_BUFFER_NEXT_PRESENT)
-	    pd->lb = vlib_get_buffer (vm, pd->lb->next_buffer);
+	  while (pd2->lb->flags & VLIB_BUFFER_NEXT_PRESENT)
+	    pd2->lb = vlib_get_buffer (vm, pd2->lb->next_buffer);
 
 	  crypto_ops = &ptd->chained_crypto_ops;
 	  integ_ops = &ptd->chained_integ_ops;
 	}
+
       pd->current_length = b[0]->current_length;
 
       /* anti-reply check */
@@ -436,260 +1173,33 @@ esp_decrypt_inline (vlib_main_t * vm,
       current_sa_pkts += 1;
       current_sa_bytes += vlib_buffer_length_in_chain (vm, b[0]);
 
-      if (PREDICT_TRUE (sa0->integ_op_id != VNET_CRYPTO_OP_NONE))
+      if (is_async)
 	{
-	  vnet_crypto_op_init (op, sa0->integ_op_id);
-	  op->key_index = sa0->integ_key_index;
-	  op->src = payload;
-	  op->flags = VNET_CRYPTO_OP_FLAG_HMAC_CHECK;
-	  op->user_data = b - bufs;
-	  op->digest = payload + len;
-	  op->digest_len = cpd.icv_sz;
-	  op->len = len;
-
-	  if (pd->lb != b[0])
+	  int ret = esp_decrypt_prepare_async_frame (vm, node, ptd,
+						     &async_frame,
+						     sa0, payload, len,
+						     cpd.icv_sz,
+						     cpd.iv_sz,
+						     pd, pd2,
+						     from[b - bufs],
+						     b[0], next, async_next);
+	  if (PREDICT_FALSE (ret < 0))
 	    {
-	      /* buffer is chained */
-	      vlib_buffer_t *cb = b[0];
-	      op->len = pd->current_length;
-
-	      /* special case when ICV is splitted and needs to be reassembled
-	       * first -> move it to the last buffer. Also take into account
-	       * that ESN needs to be added after encrypted data and may or
-	       * may not fit in the tail.*/
-	      if (pd->lb->current_length < cpd.icv_sz)
-		{
-		  u8 extra_esn = 0;
-		  op->digest =
-		    esp_move_icv_esn (vm, b[0], pd, cpd.icv_sz, sa0,
-				      &extra_esn, op);
-
-		  if (extra_esn)
-		    {
-		      /* esn is in the last buffer, that was unlinked from
-		       * the chain */
-		      op->len = b[0]->current_length;
-		    }
-		  else
-		    {
-		      if (pd->lb == b[0])
-			{
-			  /* we now have a single buffer of crypto data, adjust
-			   * the length (second buffer contains only ICV) */
-			  integ_ops = &ptd->integ_ops;
-			  crypto_ops = &ptd->crypto_ops;
-			  len = b[0]->current_length;
-			  goto out;
-			}
-		    }
-		}
-	      else
-		op->digest = vlib_buffer_get_tail (pd->lb) - cpd.icv_sz;
-
-	      op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
-	      op->chunk_index = vec_len (ptd->chunks);
-	      vec_add2 (ptd->chunks, ch, 1);
-	      ch->len = pd->current_length;
-	      ch->src = payload;
-	      cb = vlib_get_buffer (vm, cb->next_buffer);
-	      op->n_chunks = 1;
-	      while (1)
-		{
-		  vec_add2 (ptd->chunks, ch, 1);
-		  op->n_chunks += 1;
-		  ch->src = vlib_buffer_get_current (cb);
-		  if (pd->lb == cb)
-		    {
-		      if (pd->icv_removed)
-			ch->len = cb->current_length;
-		      else
-			ch->len = cb->current_length - cpd.icv_sz;
-		      if (ipsec_sa_is_set_USE_ESN (sa0))
-			{
-			  u32 seq_hi = clib_host_to_net_u32 (sa0->seq_hi);
-			  u8 tmp[ESP_MAX_ICV_SIZE], sz = sizeof (sa0->seq_hi);
-			  u8 *esn;
-			  vlib_buffer_t *tmp_b;
-			  u16 space_left = vlib_buffer_space_left_at_end
-			    (vm, pd->lb);
-			  if (space_left < sz)
-			    {
-			      if (pd->icv_removed)
-				{
-				  /* use pre-data area from the last bufer
-				     that was removed from the chain */
-				  tmp_b =
-				    vlib_get_buffer (vm,
-						     pd->free_buffer_index);
-				  esn = tmp_b->data - sz;
-				}
-			      else
-				{
-				  /* no space, need to allocate new buffer */
-				  u32 tmp_bi = 0;
-				  if (1 != vlib_buffer_alloc (vm, &tmp_bi, 1))
-				    {
-				      b[0]->error = node->errors
-					[ESP_DECRYPT_ERROR_NO_BUFFERS];
-				      next[0] = ESP_DECRYPT_NEXT_DROP;
-				      goto next;
-				    }
-				  tmp_b = vlib_get_buffer (vm, tmp_bi);
-				  esn = tmp_b->data;
-				  pd->free_buffer_index = tmp_bi;
-				}
-			      clib_memcpy_fast (esn, &seq_hi, sz);
-
-			      vec_add2 (ptd->chunks, ch, 1);
-			      op->n_chunks += 1;
-			      ch->src = esn;
-			      ch->len = sz;
-			    }
-			  else
-			    {
-			      if (pd->icv_removed)
-				{
-				  clib_memcpy_fast (vlib_buffer_get_tail
-						    (pd->lb), &seq_hi, sz);
-				}
-			      else
-				{
-				  clib_memcpy_fast (tmp, op->digest,
-						    ESP_MAX_ICV_SIZE);
-				  clib_memcpy_fast (op->digest, &seq_hi, sz);
-				  clib_memcpy_fast (op->digest + sz, tmp,
-						    ESP_MAX_ICV_SIZE);
-				  op->digest += sz;
-				}
-			      ch->len += sz;
-			    }
-			}
-		      break;
-		    }
-		  else
-		    ch->len = cb->current_length;
-
-		  if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
-		    break;
-
-		  cb = vlib_get_buffer (vm, cb->next_buffer);
-		}
+	      esp_async_recycle_failed_submit (async_frame, b, next);
+	      goto next;
 	    }
-	  else
-	    esp_insert_esn (vm, sa0, pd, op, &len, b[0], payload);
-	out:
-	  vec_add_aligned (integ_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
 	}
-
-      payload += esp_sz;
-      len -= esp_sz;
-
-      if (sa0->crypto_dec_op_id != VNET_CRYPTO_OP_NONE)
-	{
-	  vnet_crypto_op_init (op, sa0->crypto_dec_op_id);
-	  op->key_index = sa0->crypto_key_index;
-	  op->iv = payload;
-
-	  if (ipsec_sa_is_set_IS_AEAD (sa0))
-	    {
-	      esp_header_t *esp0;
-	      esp_aead_t *aad;
-	      u8 *scratch;
-
-	      /*
-	       * construct the AAD and the nonce (Salt || IV) in a scratch
-	       * space in front of the IP header.
-	       */
-	      scratch = payload - esp_sz;
-	      esp0 = (esp_header_t *) (scratch);
-
-	      scratch -= (sizeof (*aad) + pd->hdr_sz);
-	      op->aad = scratch;
-
-	      esp_aad_fill (op, esp0, sa0);
-
-	      /*
-	       * we don't need to refer to the ESP header anymore so we
-	       * can overwrite it with the salt and use the IV where it is
-	       * to form the nonce = (Salt + IV)
-	       */
-	      op->iv -= sizeof (sa0->salt);
-	      clib_memcpy_fast (op->iv, &sa0->salt, sizeof (sa0->salt));
-
-	      op->tag = payload + len;
-	      op->tag_len = 16;
-	    }
-	  op->src = op->dst = payload += cpd.iv_sz;
-	  op->len = len - cpd.iv_sz;
-	  op->user_data = b - bufs;
-
-	  if (pd->lb != b[0])
-	    {
-	      /* buffer is chained */
-	      vlib_buffer_t *cb = b[0];
-	      op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
-	      op->chunk_index = vec_len (ptd->chunks);
-	      vec_add2 (ptd->chunks, ch, 1);
-	      ch->len = len - cpd.iv_sz + cpd.icv_sz;
-	      ch->src = ch->dst = payload;
-	      cb = vlib_get_buffer (vm, cb->next_buffer);
-	      op->n_chunks = 1;
-
-	      while (1)
-		{
-		  vec_add2 (ptd->chunks, ch, 1);
-		  op->n_chunks += 1;
-		  ch->src = ch->dst = vlib_buffer_get_current (cb);
-		  if (pd->lb == cb)
-		    {
-		      if (ipsec_sa_is_set_IS_AEAD (sa0))
-			{
-			  if (pd->lb->current_length < cpd.icv_sz)
-			    {
-			      u16 dif = 0;
-			      op->tag =
-				esp_move_icv (vm, b[0], pd, cpd.icv_sz, &dif);
-
-			      /* this chunk does not contain crypto data */
-			      op->n_chunks -= 1;
-
-			      /* and fix previous chunk's length as it might have
-			         been changed */
-			      ASSERT (op->n_chunks > 0);
-			      if (pd->lb == b[0])
-				ch[-1].len -= dif;
-			      else
-				ch[-1].len = pd->lb->current_length;
-			      break;
-			    }
-			  else
-			    op->tag =
-			      vlib_buffer_get_tail (pd->lb) - cpd.icv_sz;
-			}
-
-		      if (pd->icv_removed)
-			ch->len = cb->current_length;
-		      else
-			ch->len = cb->current_length - cpd.icv_sz;
-		    }
-		  else
-		    ch->len = cb->current_length;
-
-		  if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
-		    break;
-
-		  cb = vlib_get_buffer (vm, cb->next_buffer);
-		}
-	    }
-
-	  vec_add_aligned (crypto_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
-	}
-
+      else
+	esp_decrypt_prepare_sync_op (vm, node, ptd, &crypto_ops, &integ_ops,
+				     op, sa0, payload, len, cpd.icv_sz,
+				     cpd.iv_sz, pd, pd2, b[0], next,
+				     b - bufs);
       /* next */
     next:
       n_left -= 1;
       next += 1;
       pd += 1;
+      pd2 += 1;
       b += 1;
     }
 
@@ -698,15 +1208,35 @@ esp_decrypt_inline (vlib_main_t * vm,
 				     current_sa_index, current_sa_pkts,
 				     current_sa_bytes);
 
-  esp_process_ops (vm, node, ptd->integ_ops, bufs, nexts,
-		   ESP_DECRYPT_ERROR_INTEG_ERROR);
-  esp_process_chained_ops (vm, node, ptd->chained_integ_ops, bufs, nexts,
-			   ptd->chunks, ESP_DECRYPT_ERROR_INTEG_ERROR);
+  if (is_async)
+    {
+      if (async_frame && async_frame->n_elts)
+	{
+	  if (vnet_crypto_async_submit_open_frame (vm, async_frame) < 0)
+	    esp_async_recycle_failed_submit (async_frame, b, next);
+	}
+
+      /* no post process in async */
+      n_left = from_frame->n_vectors;
+      vlib_node_increment_counter (vm, node->node_index,
+				   ESP_DECRYPT_ERROR_RX_PKTS, n_left);
+      vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left);
 
-  esp_process_ops (vm, node, ptd->crypto_ops, bufs, nexts,
-		   ESP_DECRYPT_ERROR_DECRYPTION_FAILED);
-  esp_process_chained_ops (vm, node, ptd->chained_crypto_ops, bufs, nexts,
-			   ptd->chunks, ESP_DECRYPT_ERROR_DECRYPTION_FAILED);
+      return n_left;
+    }
+  else
+    {
+      esp_process_ops (vm, node, ptd->integ_ops, bufs, nexts,
+		       ESP_DECRYPT_ERROR_INTEG_ERROR);
+      esp_process_chained_ops (vm, node, ptd->chained_integ_ops, bufs, nexts,
+			       ptd->chunks, ESP_DECRYPT_ERROR_INTEG_ERROR);
+
+      esp_process_ops (vm, node, ptd->crypto_ops, bufs, nexts,
+		       ESP_DECRYPT_ERROR_DECRYPTION_FAILED);
+      esp_process_chained_ops (vm, node, ptd->chained_crypto_ops, bufs, nexts,
+			       ptd->chunks,
+			       ESP_DECRYPT_ERROR_DECRYPTION_FAILED);
+    }
 
   /* Post decryption ronud - adjust packet data start and length and next
      node */
@@ -714,13 +1244,11 @@ esp_decrypt_inline (vlib_main_t * vm,
   n_left = from_frame->n_vectors;
   next = nexts;
   pd = pkt_data;
+  pd2 = pkt_data2;
   b = bufs;
 
   while (n_left)
     {
-      const u8 tun_flags = IPSEC_SA_FLAG_IS_TUNNEL |
-	IPSEC_SA_FLAG_IS_TUNNEL_V6;
-
       if (n_left >= 2)
 	{
 	  void *data = b[1]->data + pd[1].current_data;
@@ -737,253 +1265,83 @@ esp_decrypt_inline (vlib_main_t * vm,
 			 CLIB_CACHE_LINE_BYTES * 2, LOAD);
 	}
 
-      if (next[0] < ESP_DECRYPT_N_NEXT)
-	goto trace;
-
-      sa0 = vec_elt_at_index (im->sad, pd->sa_index);
+      if (next[0] >= ESP_DECRYPT_N_NEXT)
+	esp_decrypt_post_crypto (vm, node, pd, pd2, b[0], next, is_ip6,
+				 is_tun, 0);
 
-      /*
-       * redo the anti-reply check
-       * in this frame say we have sequence numbers, s, s+1, s+1, s+1
-       * and s and s+1 are in the window. When we did the anti-replay
-       * check above we did so against the state of the window (W),
-       * after packet s-1. So each of the packets in the sequence will be
-       * accepted.
-       * This time s will be cheked against Ws-1, s+1 chceked against Ws
-       * (i.e. the window state is updated/advnaced)
-       * so this time the successive s+! packet will be dropped.
-       * This is a consequence of batching the decrypts. If the
-       * check-dcrypt-advance process was done for each packet it would
-       * be fine. But we batch the decrypts because it's much more efficient
-       * to do so in SW and if we offload to HW and the process is async.
-       *
-       * You're probably thinking, but this means an attacker can send the
-       * above sequence and cause VPP to perform decrpyts that will fail,
-       * and that's true. But if the attacker can determine s (a valid
-       * sequence number in the window) which is non-trivial, it can generate
-       * a sequence s, s+1, s+2, s+3, ... s+n and nothing will prevent any
-       * implementation, sequential or batching, from decrypting these.
-       */
-      if (ipsec_sa_anti_replay_check (sa0, pd->seq))
+      /* trace: */
+      if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 	{
-	  b[0]->error = node->errors[ESP_DECRYPT_ERROR_REPLAY];
-	  next[0] = ESP_DECRYPT_NEXT_DROP;
-	  goto trace;
+	  esp_decrypt_trace_t *tr;
+	  tr = vlib_add_trace (vm, node, b[0], sizeof (*tr));
+	  sa0 = pool_elt_at_index (im->sad,
+				   vnet_buffer (b[0])->ipsec.sad_index);
+	  tr->crypto_alg = sa0->crypto_alg;
+	  tr->integ_alg = sa0->integ_alg;
+	  tr->seq = pd->seq;
+	  tr->sa_seq = sa0->last_seq;
+	  tr->sa_seq_hi = sa0->seq_hi;
 	}
 
-      ipsec_sa_anti_replay_advance (sa0, pd->seq);
-
-      u8 pad_length = 0, next_header = 0;
-      u16 icv_sz = pd->icv_removed ? 0 : pd->icv_sz;
+      /* next */
+      n_left -= 1;
+      next += 1;
+      pd += 1;
+      pd2 += 1;
+      b += 1;
+    }
 
-      if (pd->free_buffer_index)
-	vlib_buffer_free_one (vm, pd->free_buffer_index);
+  n_left = from_frame->n_vectors;
+  vlib_node_increment_counter (vm, node->node_index,
+			       ESP_DECRYPT_ERROR_RX_PKTS, n_left);
 
-      if (pd->lb->current_length < sizeof (esp_footer_t) + icv_sz)
-	{
-	  /* esp footer is either splitted in two buffers or in the before
-	   * last buffer */
+  vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left);
 
-	  vlib_buffer_t *before_last = b[0], *bp = b[0];
-	  while (bp->flags & VLIB_BUFFER_NEXT_PRESENT)
-	    {
-	      before_last = bp;
-	      bp = vlib_get_buffer (vm, bp->next_buffer);
-	    }
-	  u8 *bt = vlib_buffer_get_tail (before_last);
+  return n_left;
+}
 
-	  if (pd->lb->current_length == icv_sz)
-	    {
-	      esp_footer_t *f = (esp_footer_t *) (bt - sizeof (*f));
-	      pad_length = f->pad_length;
-	      next_header = f->next_header;
-	    }
-	  else
-	    {
-	      pad_length = (bt - 1)[0];
-	      next_header = ((u8 *) vlib_buffer_get_current (pd->lb))[0];
-	    }
-	}
-      else
-	{
-	  esp_footer_t *f =
-	    (esp_footer_t *) (pd->lb->data + pd->lb->current_data +
-			      pd->lb->current_length - sizeof (esp_footer_t) -
-			      icv_sz);
-	  pad_length = f->pad_length;
-	  next_header = f->next_header;
-	}
+always_inline uword
+esp_decrypt_post_inline (vlib_main_t * vm,
+			 vlib_node_runtime_t * node,
+			 vlib_frame_t * from_frame, int is_ip6, int is_tun)
+{
+  ipsec_main_t *im = &ipsec_main;
+  u32 *from = vlib_frame_vector_args (from_frame);
+  u32 n_left = from_frame->n_vectors;
+  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
+  u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
+  vlib_get_buffers (vm, from, b, n_left);
 
-      u16 adv = pd->iv_sz + esp_sz;
-      u16 tail = sizeof (esp_footer_t) + pad_length + icv_sz;
-      u16 tail_orig = sizeof (esp_footer_t) + pad_length + pd->icv_sz;
-      b[0]->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
+  while (n_left > 0)
+    {
+      esp_decrypt_packet_data_t *pd = &(esp_post_data (b[0]))->decrypt_data;
 
-      if ((pd->flags & tun_flags) == 0 && !is_tun)	/* transport mode */
+      if (n_left > 2)
 	{
-	  u8 udp_sz = (is_ip6 == 0 && pd->flags & IPSEC_SA_FLAG_UDP_ENCAP) ?
-	    sizeof (udp_header_t) : 0;
-	  u16 ip_hdr_sz = pd->hdr_sz - udp_sz;
-	  u8 *old_ip = b[0]->data + pd->current_data - ip_hdr_sz - udp_sz;
-	  u8 *ip = old_ip + adv + udp_sz;
-
-	  if (is_ip6 && ip_hdr_sz > 64)
-	    memmove (ip, old_ip, ip_hdr_sz);
-	  else
-	    clib_memcpy_le64 (ip, old_ip, ip_hdr_sz);
-
-	  b[0]->current_data = pd->current_data + adv - ip_hdr_sz;
-	  b[0]->current_length += ip_hdr_sz - adv;
-	  esp_remove_tail (vm, b[0], pd->lb, tail);
-
-	  if (is_ip6)
-	    {
-	      ip6_header_t *ip6 = (ip6_header_t *) ip;
-	      u16 len = clib_net_to_host_u16 (ip6->payload_length);
-	      len -= adv + tail_orig;
-	      ip6->payload_length = clib_host_to_net_u16 (len);
-	      ip6->protocol = next_header;
-	      next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
-	    }
-	  else
-	    {
-	      ip4_header_t *ip4 = (ip4_header_t *) ip;
-	      ip_csum_t sum = ip4->checksum;
-	      u16 len = clib_net_to_host_u16 (ip4->length);
-	      len = clib_host_to_net_u16 (len - adv - tail_orig - udp_sz);
-	      sum = ip_csum_update (sum, ip4->protocol, next_header,
-				    ip4_header_t, protocol);
-	      sum = ip_csum_update (sum, ip4->length, len,
-				    ip4_header_t, length);
-	      ip4->checksum = ip_csum_fold (sum);
-	      ip4->protocol = next_header;
-	      ip4->length = len;
-	      next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
-	    }
+	  vlib_prefetch_buffer_header (b[2], LOAD);
+	  vlib_prefetch_buffer_header (b[1], LOAD);
 	}
+
+      if (!pd->is_chain)
+	esp_decrypt_post_crypto (vm, node, pd, 0, b[0], next, is_ip6, is_tun,
+				 1);
       else
 	{
-	  if (PREDICT_TRUE (next_header == IP_PROTOCOL_IP_IN_IP))
-	    {
-	      next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
-	      b[0]->current_data = pd->current_data + adv;
-	      b[0]->current_length = pd->current_length - adv;
-	      esp_remove_tail (vm, b[0], pd->lb, tail);
-	    }
-	  else if (next_header == IP_PROTOCOL_IPV6)
-	    {
-	      next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
-	      b[0]->current_data = pd->current_data + adv;
-	      b[0]->current_length = pd->current_length - adv;
-	      esp_remove_tail (vm, b[0], pd->lb, tail);
-	    }
-	  else
-	    {
-	      if (is_tun && next_header == IP_PROTOCOL_GRE)
-		{
-		  gre_header_t *gre;
-
-		  b[0]->current_data = pd->current_data + adv;
-		  b[0]->current_length = pd->current_length - adv - tail;
-
-		  gre = vlib_buffer_get_current (b[0]);
-
-		  vlib_buffer_advance (b[0], sizeof (*gre));
-
-		  switch (clib_net_to_host_u16 (gre->protocol))
-		    {
-		    case GRE_PROTOCOL_teb:
-		      vnet_update_l2_len (b[0]);
-		      next[0] = ESP_DECRYPT_NEXT_L2_INPUT;
-		      break;
-		    case GRE_PROTOCOL_ip4:
-		      next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
-		      break;
-		    case GRE_PROTOCOL_ip6:
-		      next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
-		      break;
-		    default:
-		      b[0]->error =
-			node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD];
-		      next[0] = ESP_DECRYPT_NEXT_DROP;
-		      break;
-		    }
-		}
-	      else
-		{
-		  next[0] = ESP_DECRYPT_NEXT_DROP;
-		  b[0]->error = node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD];
-		  goto trace;
-		}
-	    }
-	  if (is_tun)
-	    {
-	      if (ipsec_sa_is_set_IS_PROTECT (sa0))
-		{
-		  /*
-		   * There are two encap possibilities
-		   * 1) the tunnel and ths SA are prodiving encap, i.e. it's
-		   *   MAC | SA-IP | TUN-IP | ESP | PAYLOAD
-		   * implying the SA is in tunnel mode (on a tunnel interface)
-		   * 2) only the tunnel provides encap
-		   *   MAC | TUN-IP | ESP | PAYLOAD
-		   * implying the SA is in transport mode.
-		   *
-		   * For 2) we need only strip the tunnel encap and we're good.
-		   *  since the tunnel and crypto ecnap (int the tun=protect
-		   * object) are the same and we verified above that these match
-		   * for 1) we need to strip the SA-IP outer headers, to
-		   * reveal the tunnel IP and then check that this matches
-		   * the configured tunnel.
-		   */
-		  const ipsec_tun_protect_t *itp;
-
-		  itp = ipsec_tun_protect_get
-		    (vnet_buffer (b[0])->ipsec.protect_index);
-
-		  if (PREDICT_TRUE (next_header == IP_PROTOCOL_IP_IN_IP))
-		    {
-		      const ip4_header_t *ip4;
-
-		      ip4 = vlib_buffer_get_current (b[0]);
-
-		      if (!ip46_address_is_equal_v4 (&itp->itp_tun.src,
-						     &ip4->dst_address) ||
-			  !ip46_address_is_equal_v4 (&itp->itp_tun.dst,
-						     &ip4->src_address))
-			{
-			  next[0] = ESP_DECRYPT_NEXT_DROP;
-			  b[0]->error =
-			    node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO];
-			}
-		    }
-		  else if (next_header == IP_PROTOCOL_IPV6)
-		    {
-		      const ip6_header_t *ip6;
-
-		      ip6 = vlib_buffer_get_current (b[0]);
-
-		      if (!ip46_address_is_equal_v6 (&itp->itp_tun.src,
-						     &ip6->dst_address) ||
-			  !ip46_address_is_equal_v6 (&itp->itp_tun.dst,
-						     &ip6->src_address))
-			{
-			  next[0] = ESP_DECRYPT_NEXT_DROP;
-			  b[0]->error =
-			    node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO];
-			}
-		    }
-		}
-	    }
+	  esp_decrypt_packet_data2_t *pd2 = esp_post_data2 (b[0]);
+	  esp_decrypt_post_crypto (vm, node, pd, pd2, b[0], next, is_ip6,
+				   is_tun, 1);
 	}
 
-    trace:
+      /*trace: */
       if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 	{
+	  ipsec_sa_t *sa0 = pool_elt_at_index (im->sad, pd->sa_index);
 	  esp_decrypt_trace_t *tr;
+	  esp_decrypt_packet_data_t *async_pd =
+	    &(esp_post_data (b[0]))->decrypt_data;
 	  tr = vlib_add_trace (vm, node, b[0], sizeof (*tr));
-	  sa0 = pool_elt_at_index (im->sad,
-				   vnet_buffer (b[0])->ipsec.sad_index);
+	  sa0 = pool_elt_at_index (im->sad, async_pd->sa_index);
+
 	  tr->crypto_alg = sa0->crypto_alg;
 	  tr->integ_alg = sa0->integ_alg;
 	  tr->seq = pd->seq;
@@ -991,16 +1349,14 @@ esp_decrypt_inline (vlib_main_t * vm,
 	  tr->sa_seq_hi = sa0->seq_hi;
 	}
 
-      /* next */
-      n_left -= 1;
-      next += 1;
-      pd += 1;
-      b += 1;
+      n_left--;
+      next++;
+      b++;
     }
 
   n_left = from_frame->n_vectors;
   vlib_node_increment_counter (vm, node->node_index,
-			       ESP_DECRYPT_ERROR_RX_PKTS, n_left);
+			       ESP_DECRYPT_ERROR_RX_POST_PKTS, n_left);
 
   vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left);
 
@@ -1011,31 +1367,80 @@ VLIB_NODE_FN (esp4_decrypt_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * from_frame)
 {
-  return esp_decrypt_inline (vm, node, from_frame, 0, 0);
+  return esp_decrypt_inline (vm, node, from_frame, 0, 0,
+			     esp_decrypt_async_next.esp4_post_next);
+}
+
+VLIB_NODE_FN (esp4_decrypt_post_node) (vlib_main_t * vm,
+				       vlib_node_runtime_t * node,
+				       vlib_frame_t * from_frame)
+{
+  return esp_decrypt_post_inline (vm, node, from_frame, 0, 0);
 }
 
 VLIB_NODE_FN (esp4_decrypt_tun_node) (vlib_main_t * vm,
 				      vlib_node_runtime_t * node,
 				      vlib_frame_t * from_frame)
 {
-  return esp_decrypt_inline (vm, node, from_frame, 0, 1);
+  return esp_decrypt_inline (vm, node, from_frame, 0, 1,
+			     esp_decrypt_async_next.esp4_tun_post_next);
+}
+
+VLIB_NODE_FN (esp4_decrypt_tun_post_node) (vlib_main_t * vm,
+					   vlib_node_runtime_t * node,
+					   vlib_frame_t * from_frame)
+{
+  return esp_decrypt_post_inline (vm, node, from_frame, 0, 1);
 }
 
 VLIB_NODE_FN (esp6_decrypt_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * from_frame)
 {
-  return esp_decrypt_inline (vm, node, from_frame, 1, 0);
+  return esp_decrypt_inline (vm, node, from_frame, 1, 0,
+			     esp_decrypt_async_next.esp6_post_next);
+}
+
+VLIB_NODE_FN (esp6_decrypt_post_node) (vlib_main_t * vm,
+				       vlib_node_runtime_t * node,
+				       vlib_frame_t * from_frame)
+{
+  return esp_decrypt_post_inline (vm, node, from_frame, 1, 0);
 }
 
 VLIB_NODE_FN (esp6_decrypt_tun_node) (vlib_main_t * vm,
 				      vlib_node_runtime_t * node,
 				      vlib_frame_t * from_frame)
 {
-  return esp_decrypt_inline (vm, node, from_frame, 1, 1);
+  return esp_decrypt_inline (vm, node, from_frame, 1, 1,
+			     esp_decrypt_async_next.esp6_tun_post_next);
+}
+
+VLIB_NODE_FN (esp6_decrypt_tun_post_node) (vlib_main_t * vm,
+					   vlib_node_runtime_t * node,
+					   vlib_frame_t * from_frame)
+{
+  return esp_decrypt_post_inline (vm, node, from_frame, 1, 1);
+}
+
+VLIB_NODE_FN (esp_decrypt_pending_node) (vlib_main_t * vm,
+					 vlib_node_runtime_t * node,
+					 vlib_frame_t * from_frame)
+{
+  return from_frame->n_vectors;
 }
 
 /* *INDENT-OFF* */
+VLIB_REGISTER_NODE (esp_decrypt_pending_node) = {
+  .name = "esp-decrypt-pending",
+  .vector_size = sizeof (u32),
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_next_nodes = 0
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
 VLIB_REGISTER_NODE (esp4_decrypt_node) = {
   .name = "esp4-decrypt",
   .vector_size = sizeof (u32),
@@ -1052,9 +1457,22 @@ VLIB_REGISTER_NODE (esp4_decrypt_node) = {
     [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input",
     [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input",
     [ESP_DECRYPT_NEXT_HANDOFF] = "esp4-decrypt-handoff",
+    [ESP_DECRYPT_NEXT_PENDING] = "esp-decrypt-pending"
   },
 };
 
+VLIB_REGISTER_NODE (esp4_decrypt_post_node) = {
+  .name = "esp4-decrypt-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_decrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
+  .error_strings = esp_decrypt_error_strings,
+
+  .sibling_of = "esp4-decrypt",
+};
+
 VLIB_REGISTER_NODE (esp6_decrypt_node) = {
   .name = "esp6-decrypt",
   .vector_size = sizeof (u32),
@@ -1071,9 +1489,22 @@ VLIB_REGISTER_NODE (esp6_decrypt_node) = {
     [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input",
     [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input",
     [ESP_DECRYPT_NEXT_HANDOFF]=  "esp6-decrypt-handoff",
+    [ESP_DECRYPT_NEXT_PENDING] = "esp-decrypt-pending"
   },
 };
 
+VLIB_REGISTER_NODE (esp6_decrypt_post_node) = {
+  .name = "esp6-decrypt-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_decrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
+  .error_strings = esp_decrypt_error_strings,
+
+  .sibling_of = "esp6-decrypt",
+};
+
 VLIB_REGISTER_NODE (esp4_decrypt_tun_node) = {
   .name = "esp4-decrypt-tun",
   .vector_size = sizeof (u32),
@@ -1088,9 +1519,22 @@ VLIB_REGISTER_NODE (esp4_decrypt_tun_node) = {
     [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input",
     [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input",
     [ESP_DECRYPT_NEXT_HANDOFF] = "esp4-decrypt-tun-handoff",
+    [ESP_DECRYPT_NEXT_PENDING] = "esp-decrypt-pending"
   },
 };
 
+VLIB_REGISTER_NODE (esp4_decrypt_tun_post_node) = {
+  .name = "esp4-decrypt-tun-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_decrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
+  .error_strings = esp_decrypt_error_strings,
+
+  .sibling_of = "esp4-decrypt-tun",
+};
+
 VLIB_REGISTER_NODE (esp6_decrypt_tun_node) = {
   .name = "esp6-decrypt-tun",
   .vector_size = sizeof (u32),
@@ -1105,8 +1549,21 @@ VLIB_REGISTER_NODE (esp6_decrypt_tun_node) = {
     [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input",
     [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input",
     [ESP_DECRYPT_NEXT_HANDOFF]=  "esp6-decrypt-tun-handoff",
+    [ESP_DECRYPT_NEXT_PENDING] = "esp-decrypt-pending"
   },
 };
+
+VLIB_REGISTER_NODE (esp6_decrypt_tun_post_node) = {
+  .name = "esp6-decrypt-tun-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_decrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
+  .error_strings = esp_decrypt_error_strings,
+
+  .sibling_of = "esp6-decrypt-tun",
+};
 /* *INDENT-ON* */
 
 /*
diff --git a/src/vnet/ipsec/esp_encrypt.c b/src/vnet/ipsec/esp_encrypt.c
index e40d30d7b3e..dce887f6fa8 100644
--- a/src/vnet/ipsec/esp_encrypt.c
+++ b/src/vnet/ipsec/esp_encrypt.c
@@ -28,6 +28,7 @@
 
 #define foreach_esp_encrypt_next                   \
 _(DROP, "error-drop")                              \
+_(PENDING, "pending")                              \
 _(HANDOFF, "handoff")                              \
 _(INTERFACE_OUTPUT, "interface-output")
 
@@ -41,8 +42,10 @@ typedef enum
 
 #define foreach_esp_encrypt_error                               \
  _(RX_PKTS, "ESP pkts received")                                \
+ _(POST_RX_PKTS, "ESP-post pkts received")                      \
  _(SEQ_CYCLED, "sequence number cycled (packet dropped)")       \
  _(CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \
+ _(CRYPTO_QUEUE_FULL, "crypto queue full (packet dropped)")     \
  _(NO_BUFFERS, "no buffers (packet dropped)")                   \
 
 typedef enum
@@ -70,6 +73,11 @@ typedef struct
   ipsec_integ_alg_t integ_alg;
 } esp_encrypt_trace_t;
 
+typedef struct
+{
+  u32 next_index;
+} esp_encrypt_post_trace_t;
+
 /* packet trace format function */
 static u8 *
 format_esp_encrypt_trace (u8 * s, va_list * args)
@@ -88,6 +96,17 @@ format_esp_encrypt_trace (u8 * s, va_list * args)
   return s;
 }
 
+static u8 *
+format_esp_post_encrypt_trace (u8 * s, va_list * args)
+{
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  esp_encrypt_post_trace_t *t = va_arg (*args, esp_encrypt_post_trace_t *);
+
+  s = format (s, "esp-post: next node index %u", t->next_index);
+  return s;
+}
+
 /* pad packet in input buffer */
 static_always_inline u8 *
 esp_add_footer_and_icv (vlib_main_t * vm, vlib_buffer_t ** last,
@@ -276,9 +295,281 @@ typedef struct
 
 STATIC_ASSERT_SIZEOF (esp_gcm_nonce_t, 12);
 
+static_always_inline u32
+esp_encrypt_chain_crypto (vlib_main_t * vm, ipsec_per_thread_data_t * ptd,
+			  ipsec_sa_t * sa0, vlib_buffer_t * b,
+			  vlib_buffer_t * lb, u8 icv_sz, u8 * start,
+			  u32 start_len, u16 * n_ch)
+{
+  vnet_crypto_op_chunk_t *ch;
+  vlib_buffer_t *cb = b;
+  u32 n_chunks = 1;
+  u32 total_len;
+  vec_add2 (ptd->chunks, ch, 1);
+  total_len = ch->len = start_len;
+  ch->src = ch->dst = start;
+  cb = vlib_get_buffer (vm, cb->next_buffer);
+
+  while (1)
+    {
+      vec_add2 (ptd->chunks, ch, 1);
+      n_chunks += 1;
+      if (lb == cb)
+	total_len += ch->len = cb->current_length - icv_sz;
+      else
+	total_len += ch->len = cb->current_length;
+      ch->src = ch->dst = vlib_buffer_get_current (cb);
+
+      if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
+	break;
+
+      cb = vlib_get_buffer (vm, cb->next_buffer);
+    }
+
+  if (n_ch)
+    *n_ch = n_chunks;
+
+  return total_len;
+}
+
+static_always_inline u32
+esp_encrypt_chain_integ (vlib_main_t * vm, ipsec_per_thread_data_t * ptd,
+			 ipsec_sa_t * sa0, vlib_buffer_t * b,
+			 vlib_buffer_t * lb, u8 icv_sz, u8 * start,
+			 u32 start_len, u8 * digest, u16 * n_ch)
+{
+  vnet_crypto_op_chunk_t *ch;
+  vlib_buffer_t *cb = b;
+  u32 n_chunks = 1;
+  u32 total_len;
+  vec_add2 (ptd->chunks, ch, 1);
+  total_len = ch->len = start_len;
+  ch->src = start;
+  cb = vlib_get_buffer (vm, cb->next_buffer);
+
+  while (1)
+    {
+      vec_add2 (ptd->chunks, ch, 1);
+      n_chunks += 1;
+      if (lb == cb)
+	{
+	  total_len += ch->len = cb->current_length - icv_sz;
+	  if (ipsec_sa_is_set_USE_ESN (sa0))
+	    {
+	      u32 seq_hi = clib_net_to_host_u32 (sa0->seq_hi);
+	      clib_memcpy_fast (digest, &seq_hi, sizeof (seq_hi));
+	      ch->len += sizeof (seq_hi);
+	      total_len += sizeof (seq_hi);
+	    }
+	}
+      else
+	total_len += ch->len = cb->current_length;
+      ch->src = vlib_buffer_get_current (cb);
+
+      if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
+	break;
+
+      cb = vlib_get_buffer (vm, cb->next_buffer);
+    }
+
+  if (n_ch)
+    *n_ch = n_chunks;
+
+  return total_len;
+}
+
+always_inline void
+esp_prepare_sync_op (vlib_main_t * vm, ipsec_per_thread_data_t * ptd,
+		     vnet_crypto_op_t ** crypto_ops,
+		     vnet_crypto_op_t ** integ_ops, ipsec_sa_t * sa0,
+		     u8 * payload, u16 payload_len, u8 iv_sz, u8 icv_sz,
+		     vlib_buffer_t ** bufs, vlib_buffer_t ** b,
+		     vlib_buffer_t * lb, u32 hdr_len, esp_header_t * esp,
+		     esp_gcm_nonce_t * nonce)
+{
+  if (sa0->crypto_enc_op_id)
+    {
+      vnet_crypto_op_t *op;
+      vec_add2_aligned (crypto_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
+      vnet_crypto_op_init (op, sa0->crypto_enc_op_id);
+
+      op->src = op->dst = payload;
+      op->key_index = sa0->crypto_key_index;
+      op->len = payload_len - icv_sz;
+      op->user_data = b - bufs;
+
+      if (ipsec_sa_is_set_IS_AEAD (sa0))
+	{
+	  /*
+	   * construct the AAD in a scratch space in front
+	   * of the IP header.
+	   */
+	  op->aad = payload - hdr_len - sizeof (esp_aead_t);
+	  op->aad_len = esp_aad_fill (op->aad, esp, sa0);
+
+	  op->tag = payload + op->len;
+	  op->tag_len = 16;
+
+	  u64 *iv = (u64 *) (payload - iv_sz);
+	  nonce->salt = sa0->salt;
+	  nonce->iv = *iv = clib_host_to_net_u64 (sa0->gcm_iv_counter++);
+	  op->iv = (u8 *) nonce;
+	}
+      else
+	{
+	  op->iv = payload - iv_sz;
+	  op->flags = VNET_CRYPTO_OP_FLAG_INIT_IV;
+	}
+
+      if (lb != b[0])
+	{
+	  /* is chained */
+	  op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+	  op->chunk_index = vec_len (ptd->chunks);
+	  op->tag = vlib_buffer_get_tail (lb) - icv_sz;
+	  esp_encrypt_chain_crypto (vm, ptd, sa0, b[0], lb, icv_sz, payload,
+				    payload_len, &op->n_chunks);
+	}
+    }
+
+  if (sa0->integ_op_id)
+    {
+      vnet_crypto_op_t *op;
+      vec_add2_aligned (integ_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
+      vnet_crypto_op_init (op, sa0->integ_op_id);
+      op->src = payload - iv_sz - sizeof (esp_header_t);
+      op->digest = payload + payload_len - icv_sz;
+      op->key_index = sa0->integ_key_index;
+      op->digest_len = icv_sz;
+      op->len = payload_len - icv_sz + iv_sz + sizeof (esp_header_t);
+      op->user_data = b - bufs;
+
+      if (lb != b[0])
+	{
+	  /* is chained */
+	  op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+	  op->chunk_index = vec_len (ptd->chunks);
+	  op->digest = vlib_buffer_get_tail (lb) - icv_sz;
+
+	  esp_encrypt_chain_integ (vm, ptd, sa0, b[0], lb, icv_sz,
+				   payload - iv_sz - sizeof (esp_header_t),
+				   payload_len + iv_sz +
+				   sizeof (esp_header_t), op->digest,
+				   &op->n_chunks);
+	}
+      else if (ipsec_sa_is_set_USE_ESN (sa0))
+	{
+	  u32 seq_hi = clib_net_to_host_u32 (sa0->seq_hi);
+	  clib_memcpy_fast (op->digest, &seq_hi, sizeof (seq_hi));
+	  op->len += sizeof (seq_hi);
+	}
+    }
+}
+
+static_always_inline int
+esp_prepare_async_frame (vlib_main_t * vm, ipsec_per_thread_data_t * ptd,
+			 vnet_crypto_async_frame_t ** async_frame,
+			 ipsec_sa_t * sa, vlib_buffer_t * b,
+			 esp_header_t * esp, u8 * payload, u32 payload_len,
+			 u8 iv_sz, u8 icv_sz, u32 bi, u16 * next, u32 hdr_len,
+			 u16 async_next, vlib_buffer_t * lb)
+{
+  esp_post_data_t *post = esp_post_data (b);
+  u8 *tag, *iv, *aad = 0;
+  u8 flag = 0;
+  u32 key_index;
+  i16 crypto_start_offset, integ_start_offset = 0;
+  u16 crypto_total_len, integ_total_len;
+
+  post->next_index = next[0];
+  next[0] = ESP_ENCRYPT_NEXT_PENDING;
+
+  /* crypto */
+  crypto_start_offset = payload - b->data;
+  crypto_total_len = integ_total_len = payload_len - icv_sz;
+  tag = payload + crypto_total_len;
+
+  /* aead */
+  if (ipsec_sa_is_set_IS_AEAD (sa))
+    {
+      esp_gcm_nonce_t *nonce;
+      u64 *pkt_iv = (u64 *) (payload - iv_sz);
+
+      aad = payload - hdr_len - sizeof (esp_aead_t);
+      esp_aad_fill (aad, esp, sa);
+      nonce = (esp_gcm_nonce_t *) (aad - sizeof (*nonce));
+      nonce->salt = sa->salt;
+      nonce->iv = *pkt_iv = clib_host_to_net_u64 (sa->gcm_iv_counter++);
+      iv = (u8 *) nonce;
+      key_index = sa->crypto_key_index;
+
+      if (lb != b)
+	{
+	  /* chain */
+	  flag |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+	  tag = vlib_buffer_get_tail (lb) - icv_sz;
+	  crypto_total_len = esp_encrypt_chain_crypto (vm, ptd, sa, b, lb,
+						       icv_sz, payload,
+						       payload_len, 0);
+	}
+      goto out;
+    }
+
+  /* cipher then hash */
+  iv = payload - iv_sz;
+  integ_start_offset = crypto_start_offset - iv_sz - sizeof (esp_header_t);
+  integ_total_len += iv_sz + sizeof (esp_header_t);
+  flag |= VNET_CRYPTO_OP_FLAG_INIT_IV;
+  key_index = sa->linked_key_index;
+
+  if (b != lb)
+    {
+      flag |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+      crypto_total_len = esp_encrypt_chain_crypto (vm, ptd, sa, b, lb,
+						   icv_sz, payload,
+						   payload_len, 0);
+      tag = vlib_buffer_get_tail (lb) - icv_sz;
+      integ_total_len = esp_encrypt_chain_integ (vm, ptd, sa, b, lb, icv_sz,
+						 payload - iv_sz -
+						 sizeof (esp_header_t),
+						 payload_len + iv_sz +
+						 sizeof (esp_header_t),
+						 tag, 0);
+    }
+  else if (ipsec_sa_is_set_USE_ESN (sa) && !ipsec_sa_is_set_IS_AEAD (sa))
+    {
+      u32 seq_hi = clib_net_to_host_u32 (sa->seq_hi);
+      clib_memcpy_fast (tag, &seq_hi, sizeof (seq_hi));
+      integ_total_len += sizeof (seq_hi);
+    }
+
+out:
+  return vnet_crypto_async_add_to_frame (vm, async_frame, key_index,
+					 crypto_total_len,
+					 integ_total_len - crypto_total_len,
+					 crypto_start_offset,
+					 integ_start_offset, bi, async_next,
+					 iv, tag, aad, flag);
+}
+
+/* when submitting a frame is failed, drop all buffers in the frame */
+static_always_inline void
+esp_async_recycle_failed_submit (vnet_crypto_async_frame_t * f,
+				 vlib_buffer_t ** b, u16 * next)
+{
+  u32 n_drop = f->n_elts;
+  while (--n_drop)
+    {
+      (b - n_drop)[0]->error = ESP_ENCRYPT_ERROR_CRYPTO_ENGINE_ERROR;
+      (next - n_drop)[0] = ESP_ENCRYPT_NEXT_DROP;
+    }
+  vnet_crypto_async_reset_frame (f);
+}
+
 always_inline uword
 esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
-		    vlib_frame_t * frame, int is_ip6, int is_tun)
+		    vlib_frame_t * frame, int is_ip6, int is_tun,
+		    u16 async_next)
 {
   ipsec_main_t *im = &ipsec_main;
   ipsec_per_thread_data_t *ptd = vec_elt_at_index (im->ptd, vm->thread_index);
@@ -293,16 +584,21 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
   u32 current_sa_bytes = 0, spi = 0;
   u8 block_sz = 0, iv_sz = 0, icv_sz = 0;
   ipsec_sa_t *sa0 = 0;
-  vnet_crypto_op_chunk_t *ch;
   vlib_buffer_t *lb;
   vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops;
   vnet_crypto_op_t **integ_ops = &ptd->integ_ops;
+  vnet_crypto_async_frame_t *async_frame = 0;
+  int is_async = im->async_mode;
+  vnet_crypto_async_op_id_t last_async_op = ~0;
 
   vlib_get_buffers (vm, from, b, n_left);
-  vec_reset_length (ptd->crypto_ops);
-  vec_reset_length (ptd->integ_ops);
-  vec_reset_length (ptd->chained_crypto_ops);
-  vec_reset_length (ptd->chained_integ_ops);
+  if (!is_async)
+    {
+      vec_reset_length (ptd->crypto_ops);
+      vec_reset_length (ptd->integ_ops);
+      vec_reset_length (ptd->chained_crypto_ops);
+      vec_reset_length (ptd->chained_integ_ops);
+    }
   vec_reset_length (ptd->chunks);
 
   while (n_left > 0)
@@ -351,6 +647,20 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	  block_sz = sa0->crypto_block_size;
 	  icv_sz = sa0->integ_icv_size;
 	  iv_sz = sa0->crypto_iv_size;
+
+	  /* submit frame when op_id is different then the old one */
+	  if (is_async && sa0->crypto_async_enc_op_id != last_async_op)
+	    {
+	      if (async_frame && async_frame->n_elts)
+		{
+		  if (vnet_crypto_async_submit_open_frame (vm, async_frame)
+		      < 0)
+		    esp_async_recycle_failed_submit (async_frame, b, next);
+		}
+	      async_frame =
+		vnet_crypto_async_get_frame (vm, sa0->crypto_async_enc_op_id);
+	      last_async_op = sa0->crypto_async_enc_op_id;
+	    }
 	}
 
       if (PREDICT_FALSE (~0 == sa0->encrypt_thread_index))
@@ -569,129 +879,25 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       esp->spi = spi;
       esp->seq = clib_net_to_host_u32 (sa0->seq);
 
-      if (sa0->crypto_enc_op_id)
+      if (is_async)
 	{
-	  vnet_crypto_op_t *op;
-	  vec_add2_aligned (crypto_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
-	  vnet_crypto_op_init (op, sa0->crypto_enc_op_id);
-
-	  op->src = op->dst = payload;
-	  op->key_index = sa0->crypto_key_index;
-	  op->len = payload_len - icv_sz;
-	  op->user_data = b - bufs;
-
-	  if (ipsec_sa_is_set_IS_AEAD (sa0))
-	    {
-	      /*
-	       * construct the AAD in a scratch space in front
-	       * of the IP header.
-	       */
-	      op->aad = payload - hdr_len - sizeof (esp_aead_t);
-
-	      esp_aad_fill (op, esp, sa0);
-
-	      op->tag = payload + op->len;
-	      op->tag_len = 16;
-
-	      u64 *iv = (u64 *) (payload - iv_sz);
-	      nonce->salt = sa0->salt;
-	      nonce->iv = *iv = clib_host_to_net_u64 (sa0->gcm_iv_counter++);
-	      op->iv = (u8 *) nonce;
-	      nonce++;
-	    }
-	  else
-	    {
-	      op->iv = payload - iv_sz;
-	      op->flags = VNET_CRYPTO_OP_FLAG_INIT_IV;
-	    }
+	  if (PREDICT_FALSE (sa0->crypto_async_enc_op_id == 0))
+	    goto trace;
 
-	  if (lb != b[0])
+	  if (esp_prepare_async_frame (vm, ptd, &async_frame, sa0, b[0], esp,
+				       payload, payload_len, iv_sz,
+				       icv_sz, from[b - bufs], next, hdr_len,
+				       async_next, lb))
 	    {
-	      /* is chained */
-	      vlib_buffer_t *cb = b[0];
-	      op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
-	      op->chunk_index = vec_len (ptd->chunks);
-	      op->tag = vlib_buffer_get_tail (lb) - icv_sz;
-	      vec_add2 (ptd->chunks, ch, 1);
-	      ch->len = payload_len;
-	      ch->src = ch->dst = payload;
-	      cb = vlib_get_buffer (vm, cb->next_buffer);
-	      op->n_chunks = 1;
-
-	      while (1)
-		{
-		  vec_add2 (ptd->chunks, ch, 1);
-		  op->n_chunks += 1;
-		  if (lb == cb)
-		    ch->len = cb->current_length - icv_sz;
-		  else
-		    ch->len = cb->current_length;
-		  ch->src = ch->dst = vlib_buffer_get_current (cb);
-
-		  if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
-		    break;
-
-		  cb = vlib_get_buffer (vm, cb->next_buffer);
-		}
+	      esp_async_recycle_failed_submit (async_frame, b, next);
+	      goto trace;
 	    }
 	}
-
-      if (sa0->integ_op_id)
+      else
 	{
-	  vnet_crypto_op_t *op;
-	  vec_add2_aligned (integ_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
-	  vnet_crypto_op_init (op, sa0->integ_op_id);
-	  op->src = payload - iv_sz - sizeof (esp_header_t);
-	  op->digest = payload + payload_len - icv_sz;
-	  op->key_index = sa0->integ_key_index;
-	  op->digest_len = icv_sz;
-	  op->len = payload_len - icv_sz + iv_sz + sizeof (esp_header_t);
-	  op->user_data = b - bufs;
-
-	  if (lb != b[0])
-	    {
-	      /* is chained */
-	      op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
-	      vlib_buffer_t *cb = b[0];
-	      op->chunk_index = vec_len (ptd->chunks);
-	      op->digest = vlib_buffer_get_tail (lb) - icv_sz;
-	      vec_add2 (ptd->chunks, ch, 1);
-	      ch->len = payload_len + iv_sz + sizeof (esp_header_t);
-	      ch->src = payload - iv_sz - sizeof (esp_header_t);
-	      cb = vlib_get_buffer (vm, cb->next_buffer);
-	      op->n_chunks = 1;
-
-	      while (1)
-		{
-		  vec_add2 (ptd->chunks, ch, 1);
-		  op->n_chunks += 1;
-		  if (lb == cb)
-		    {
-		      ch->len = cb->current_length - icv_sz;
-		      if (ipsec_sa_is_set_USE_ESN (sa0))
-			{
-			  u32 seq_hi = clib_net_to_host_u32 (sa0->seq_hi);
-			  clib_memcpy_fast (op->digest, &seq_hi,
-					    sizeof (seq_hi));
-			  ch->len += sizeof (seq_hi);
-			}
-		    }
-		  else
-		    ch->len = cb->current_length;
-		  ch->src = vlib_buffer_get_current (cb);
-
-		  if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
-		    break;
-
-		  cb = vlib_get_buffer (vm, cb->next_buffer);
-		}
-	    }
-	  else if (ipsec_sa_is_set_USE_ESN (sa0))
-	    {
-	      u32 seq_hi = clib_net_to_host_u32 (sa0->seq_hi);
-	      clib_memcpy_fast (op->digest, &seq_hi, sizeof (seq_hi));
-	      op->len += sizeof (seq_hi);
-	    }
+	  esp_prepare_sync_op (vm, ptd, crypto_ops, integ_ops, sa0, payload,
+			       payload_len, iv_sz, icv_sz, bufs, b, lb,
+			       hdr_len, esp, nonce++);
 	}
 
       vlib_buffer_advance (b[0], 0LL - hdr_len);
@@ -721,14 +927,21 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
   vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
 				   current_sa_index, current_sa_packets,
 				   current_sa_bytes);
+  if (!is_async)
+    {
+      esp_process_ops (vm, node, ptd->crypto_ops, bufs, nexts);
+      esp_process_chained_ops (vm, node, ptd->chained_crypto_ops, bufs, nexts,
+			       ptd->chunks);
 
-  esp_process_ops (vm, node, ptd->crypto_ops, bufs, nexts);
-  esp_process_chained_ops (vm, node, ptd->chained_crypto_ops, bufs, nexts,
-			   ptd->chunks);
-
-  esp_process_ops (vm, node, ptd->integ_ops, bufs, nexts);
-  esp_process_chained_ops (vm, node, ptd->chained_integ_ops, bufs, nexts,
-			   ptd->chunks);
+      esp_process_ops (vm, node, ptd->integ_ops, bufs, nexts);
+      esp_process_chained_ops (vm, node, ptd->chained_integ_ops, bufs, nexts,
+			       ptd->chunks);
+    }
+  else if (async_frame && async_frame->n_elts)
+    {
+      if (vnet_crypto_async_submit_open_frame (vm, async_frame) < 0)
+	esp_async_recycle_failed_submit (async_frame, b, next);
+    }
 
   vlib_node_increment_counter (vm, node->node_index,
 			       ESP_ENCRYPT_ERROR_RX_PKTS, frame->n_vectors);
@@ -737,11 +950,98 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
   return frame->n_vectors;
 }
 
+always_inline uword
+esp_encrypt_post_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+			 vlib_frame_t * frame)
+{
+  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
+  u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
+  u32 *from = vlib_frame_vector_args (frame);
+  u32 n_left = frame->n_vectors;
+
+  vlib_get_buffers (vm, from, b, n_left);
+
+  if (n_left >= 4)
+    {
+      vlib_prefetch_buffer_header (b[0], LOAD);
+      vlib_prefetch_buffer_header (b[1], LOAD);
+      vlib_prefetch_buffer_header (b[2], LOAD);
+      vlib_prefetch_buffer_header (b[3], LOAD);
+    }
+
+  while (n_left > 8)
+    {
+      vlib_prefetch_buffer_header (b[4], LOAD);
+      vlib_prefetch_buffer_header (b[5], LOAD);
+      vlib_prefetch_buffer_header (b[6], LOAD);
+      vlib_prefetch_buffer_header (b[7], LOAD);
+
+      next[0] = (esp_post_data (b[0]))->next_index;
+      next[1] = (esp_post_data (b[1]))->next_index;
+      next[2] = (esp_post_data (b[2]))->next_index;
+      next[3] = (esp_post_data (b[3]))->next_index;
+
+      if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
+	{
+	  if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
+	    {
+	      esp_encrypt_post_trace_t *tr = vlib_add_trace (vm, node, b[0],
+							     sizeof (*tr));
+	      tr->next_index = next[0];
+	    }
+	  if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
+	    {
+	      esp_encrypt_post_trace_t *tr = vlib_add_trace (vm, node, b[1],
+							     sizeof (*tr));
+	      tr->next_index = next[1];
+	    }
+	  if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
+	    {
+	      esp_encrypt_post_trace_t *tr = vlib_add_trace (vm, node, b[2],
+							     sizeof (*tr));
+	      tr->next_index = next[2];
+	    }
+	  if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
+	    {
+	      esp_encrypt_post_trace_t *tr = vlib_add_trace (vm, node, b[3],
+							     sizeof (*tr));
+	      tr->next_index = next[3];
+	    }
+	}
+
+      b += 4;
+      next += 4;
+      n_left -= 4;
+    }
+
+  while (n_left > 0)
+    {
+      next[0] = (esp_post_data (b[0]))->next_index;
+      if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
+	{
+	  esp_encrypt_post_trace_t *tr = vlib_add_trace (vm, node, b[0],
+							 sizeof (*tr));
+	  tr->next_index = next[0];
+	}
+
+      b += 1;
+      next += 1;
+      n_left -= 1;
+    }
+
+  vlib_node_increment_counter (vm, node->node_index,
+			       ESP_ENCRYPT_ERROR_POST_RX_PKTS,
+			       frame->n_vectors);
+  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
+  return frame->n_vectors;
+}
+
 VLIB_NODE_FN (esp4_encrypt_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * from_frame)
 {
-  return esp_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ , 0);
+  return esp_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ , 0,
+			     esp_encrypt_async_next.esp4_post_next);
 }
 
 /* *INDENT-OFF* */
@@ -759,15 +1059,37 @@ VLIB_REGISTER_NODE (esp4_encrypt_node) = {
     [ESP_ENCRYPT_NEXT_DROP] = "ip4-drop",
     [ESP_ENCRYPT_NEXT_HANDOFF] = "esp4-encrypt-handoff",
     [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "interface-output",
+    [ESP_ENCRYPT_NEXT_PENDING] = "esp-encrypt-pending",
   },
 };
 /* *INDENT-ON* */
 
+VLIB_NODE_FN (esp4_encrypt_post_node) (vlib_main_t * vm,
+				       vlib_node_runtime_t * node,
+				       vlib_frame_t * from_frame)
+{
+  return esp_encrypt_post_inline (vm, node, from_frame);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (esp4_encrypt_post_node) = {
+  .name = "esp4-encrypt-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_post_encrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .sibling_of = "esp4-encrypt",
+
+  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
+  .error_strings = esp_encrypt_error_strings,
+};
+/* *INDENT-ON* */
+
 VLIB_NODE_FN (esp6_encrypt_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * from_frame)
 {
-  return esp_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ , 0);
+  return esp_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ , 0,
+			     esp_encrypt_async_next.esp6_post_next);
 }
 
 /* *INDENT-OFF* */
@@ -785,15 +1107,37 @@ VLIB_REGISTER_NODE (esp6_encrypt_node) = {
     [ESP_ENCRYPT_NEXT_DROP] = "ip6-drop",
     [ESP_ENCRYPT_NEXT_HANDOFF] = "esp6-encrypt-handoff",
     [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "interface-output",
+    [ESP_ENCRYPT_NEXT_PENDING] = "esp-encrypt-pending",
   },
 };
 /* *INDENT-ON* */
 
+VLIB_NODE_FN (esp6_encrypt_post_node) (vlib_main_t * vm,
+				       vlib_node_runtime_t * node,
+				       vlib_frame_t * from_frame)
+{
+  return esp_encrypt_post_inline (vm, node, from_frame);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (esp6_encrypt_post_node) = {
+  .name = "esp6-encrypt-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_post_encrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .sibling_of = "esp6-encrypt",
+
+  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
+  .error_strings = esp_encrypt_error_strings,
+};
+/* *INDENT-ON* */
+
 VLIB_NODE_FN (esp4_encrypt_tun_node) (vlib_main_t * vm,
 				      vlib_node_runtime_t * node,
 				      vlib_frame_t * from_frame)
 {
-  return esp_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ , 1);
+  return esp_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ , 1,
+			     esp_encrypt_async_next.esp4_tun_post_next);
 }
 
 /* *INDENT-OFF* */
@@ -811,9 +1155,29 @@ VLIB_REGISTER_NODE (esp4_encrypt_tun_node) = {
     [ESP_ENCRYPT_NEXT_DROP] = "ip4-drop",
     [ESP_ENCRYPT_NEXT_HANDOFF] = "esp4-encrypt-tun-handoff",
     [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "error-drop",
+    [ESP_ENCRYPT_NEXT_PENDING] = "esp-encrypt-pending",
   },
 };
 
+VLIB_NODE_FN (esp4_encrypt_tun_post_node) (vlib_main_t * vm,
+				  vlib_node_runtime_t * node,
+				  vlib_frame_t * from_frame)
+{
+  return esp_encrypt_post_inline (vm, node, from_frame);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (esp4_encrypt_tun_post_node) = {
+  .name = "esp4-encrypt-tun-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_post_encrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .sibling_of = "esp4-encrypt-tun",
+
+  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
+  .error_strings = esp_encrypt_error_strings,
+};
+
 VNET_FEATURE_INIT (esp4_encrypt_tun_feat_node, static) =
 {
   .arc_name = "ip4-output",
@@ -840,7 +1204,8 @@ VLIB_NODE_FN (esp6_encrypt_tun_node) (vlib_main_t * vm,
 				      vlib_node_runtime_t * node,
 				      vlib_frame_t * from_frame)
 {
-  return esp_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ , 1);
+  return esp_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ , 1,
+			     esp_encrypt_async_next.esp6_tun_post_next);
 }
 
 /* *INDENT-OFF* */
@@ -858,6 +1223,7 @@ VLIB_REGISTER_NODE (esp6_encrypt_tun_node) = {
     [ESP_ENCRYPT_NEXT_DROP] = "ip6-drop",
     [ESP_ENCRYPT_NEXT_HANDOFF] = "esp6-encrypt-tun-handoff",
     [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "error-drop",
+    [ESP_ENCRYPT_NEXT_PENDING] = "esp-encrypt-pending",
   },
 };
 
@@ -877,6 +1243,26 @@ VNET_FEATURE_INIT (esp4o6_encrypt_tun_feat_node, static) =
 
 /* *INDENT-ON* */
 
+VLIB_NODE_FN (esp6_encrypt_tun_post_node) (vlib_main_t * vm,
+					   vlib_node_runtime_t * node,
+					   vlib_frame_t * from_frame)
+{
+  return esp_encrypt_post_inline (vm, node, from_frame);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (esp6_encrypt_tun_post_node) = {
+  .name = "esp6-encrypt-tun-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_post_encrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .sibling_of = "esp6-encrypt-tun",
+
+  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
+  .error_strings = esp_encrypt_error_strings,
+};
+/* *INDENT-ON* */
+
 typedef struct
 {
   u32 sa_index;
@@ -1008,6 +1394,23 @@ VNET_FEATURE_INIT (esp6_no_crypto_tun_feat_node, static) =
 };
 /* *INDENT-ON* */
 
+VLIB_NODE_FN (esp_encrypt_pending_node) (vlib_main_t * vm,
+					 vlib_node_runtime_t * node,
+					 vlib_frame_t * from_frame)
+{
+  return from_frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (esp_encrypt_pending_node) = {
+  .name = "esp-encrypt-pending",
+  .vector_size = sizeof (u32),
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_next_nodes = 0
+};
+/* *INDENT-ON* */
+
 /*
  * fd.io coding-style-patch-verification: ON
  *
diff --git a/src/vnet/ipsec/ipsec.c b/src/vnet/ipsec/ipsec.c
index e7cb615f957..6b31926be4f 100644
--- a/src/vnet/ipsec/ipsec.c
+++ b/src/vnet/ipsec/ipsec.c
@@ -26,6 +26,8 @@
 #include <vnet/ipsec/ah.h>
 
 ipsec_main_t ipsec_main;
+esp_async_post_next_t esp_encrypt_async_next;
+esp_async_post_next_t esp_decrypt_async_next;
 
 static clib_error_t *
 ipsec_check_ah_support (ipsec_sa_t * sa)
@@ -173,7 +175,8 @@ ipsec_register_esp_backend (vlib_main_t * vm, ipsec_main_t * im,
 			    const char *esp6_decrypt_node_name,
 			    const char *esp6_decrypt_tun_node_name,
 			    check_support_cb_t esp_check_support_cb,
-			    add_del_sa_sess_cb_t esp_add_del_sa_sess_cb)
+			    add_del_sa_sess_cb_t esp_add_del_sa_sess_cb,
+			    enable_disable_cb_t enable_disable_cb)
 {
   ipsec_esp_backend_t *b;
 
@@ -206,6 +209,8 @@ ipsec_register_esp_backend (vlib_main_t * vm, ipsec_main_t * im,
 
   b->check_support_cb = esp_check_support_cb;
   b->add_del_sa_sess_cb = esp_add_del_sa_sess_cb;
+  b->enable_disable_cb = enable_disable_cb;
+
   return b - im->esp_backends;
 }
 
@@ -253,6 +258,18 @@ ipsec_select_esp_backend (ipsec_main_t * im, u32 backend_idx)
   if (pool_is_free_index (im->esp_backends, backend_idx))
     return VNET_API_ERROR_INVALID_VALUE;
 
+  /* disable current backend */
+  if (im->esp_current_backend != ~0)
+    {
+      ipsec_esp_backend_t *cb = pool_elt_at_index (im->esp_backends,
+						   im->esp_current_backend);
+      if (cb->enable_disable_cb)
+	{
+	  if ((cb->enable_disable_cb) (0) != 0)
+	    return -1;
+	}
+    }
+
   ipsec_esp_backend_t *b = pool_elt_at_index (im->esp_backends, backend_idx);
   im->esp_current_backend = backend_idx;
   im->esp4_encrypt_node_index = b->esp4_encrypt_node_index;
@@ -273,9 +290,64 @@ ipsec_select_esp_backend (ipsec_main_t * im, u32 backend_idx)
   im->esp46_encrypt_tun_feature_index = b->esp46_encrypt_tun_feature_index;
   im->esp66_encrypt_tun_feature_index = b->esp66_encrypt_tun_feature_index;
 
+  if (b->enable_disable_cb)
+    {
+      if ((b->enable_disable_cb) (1) != 0)
+	return -1;
+    }
   return 0;
 }
 
+void
+ipsec_set_async_mode (u32 is_enabled)
+{
+  ipsec_main_t *im = &ipsec_main;
+  ipsec_sa_t *sa;
+
+  /* lock all SAs before change im->async_mode */
+  pool_foreach (sa, im->sad, (
+			       {
+			       fib_node_lock (&sa->node);
+			       }));
+
+  im->async_mode = is_enabled;
+
+  /* change SA crypto op data before unlock them */
+  pool_foreach (sa, im->sad, (
+			       {
+			       sa->crypto_op_data = is_enabled ?
+			       sa->async_op_data.data : sa->sync_op_data.data;
+			       fib_node_unlock (&sa->node);
+			       }));
+}
+
+static void
+crypto_engine_backend_register_post_node (vlib_main_t * vm)
+{
+  esp_async_post_next_t *eit;
+  esp_async_post_next_t *dit;
+
+  eit = &esp_encrypt_async_next;
+  eit->esp4_post_next =
+    vnet_crypto_register_post_node (vm, "esp4-encrypt-post");
+  eit->esp6_post_next =
+    vnet_crypto_register_post_node (vm, "esp6-encrypt-post");
+  eit->esp4_tun_post_next =
+    vnet_crypto_register_post_node (vm, "esp4-encrypt-tun-post");
+  eit->esp6_tun_post_next =
+    vnet_crypto_register_post_node (vm, "esp6-encrypt-tun-post");
+
+  dit = &esp_decrypt_async_next;
+  dit->esp4_post_next =
+    vnet_crypto_register_post_node (vm, "esp4-decrypt-post");
+  dit->esp6_post_next =
+    vnet_crypto_register_post_node (vm, "esp6-decrypt-post");
+  dit->esp4_tun_post_next =
+    vnet_crypto_register_post_node (vm, "esp4-decrypt-tun-post");
+  dit->esp6_tun_post_next =
+    vnet_crypto_register_post_node (vm, "esp6-decrypt-tun-post");
+}
+
 static clib_error_t *
 ipsec_init (vlib_main_t * vm)
 {
@@ -298,6 +370,9 @@ ipsec_init (vlib_main_t * vm)
   ASSERT (node);
   im->error_drop_node_index = node->index;
 
+  im->ah_current_backend = ~0;
+  im->esp_current_backend = ~0;
+
   u32 idx = ipsec_register_ah_backend (vm, im, "crypto engine backend",
 				       "ah4-encrypt",
 				       "ah4-decrypt",
@@ -320,7 +395,8 @@ ipsec_init (vlib_main_t * vm)
 				    "esp6-encrypt-tun",
 				    "esp6-decrypt",
 				    "esp6-decrypt-tun",
-				    ipsec_check_esp_support, NULL);
+				    ipsec_check_esp_support,
+				    NULL, crypto_dispatch_enable_disable);
   im->esp_default_backend = idx;
 
   rv = ipsec_select_esp_backend (im, idx);
@@ -454,6 +530,9 @@ ipsec_init (vlib_main_t * vm)
   im->esp6_dec_tun_fq_index =
     vlib_frame_queue_main_init (esp6_decrypt_tun_node.index, 0);
 
+  im->async_mode = 0;
+  crypto_engine_backend_register_post_node (vm);
+
   return 0;
 }
 
diff --git a/src/vnet/ipsec/ipsec.h b/src/vnet/ipsec/ipsec.h
index f1b7dafa9be..712e16dab4c 100644
--- a/src/vnet/ipsec/ipsec.h
+++ b/src/vnet/ipsec/ipsec.h
@@ -28,6 +28,7 @@
 
 typedef clib_error_t *(*add_del_sa_sess_cb_t) (u32 sa_index, u8 is_add);
 typedef clib_error_t *(*check_support_cb_t) (ipsec_sa_t * sa);
+typedef clib_error_t *(*enable_disable_cb_t) (int is_enable);
 
 typedef struct
 {
@@ -53,6 +54,8 @@ typedef struct
   add_del_sa_sess_cb_t add_del_sa_sess_cb;
   /* check support function */
   check_support_cb_t check_support_cb;
+  /* enable or disable function */
+  enable_disable_cb_t enable_disable_cb;
   u32 esp4_encrypt_node_index;
   u32 esp4_decrypt_node_index;
   u32 esp4_encrypt_next_index;
@@ -194,6 +197,8 @@ typedef struct
   u32 esp6_enc_tun_fq_index;
   u32 esp4_dec_tun_fq_index;
   u32 esp6_dec_tun_fq_index;
+
+  u8 async_mode;
 } ipsec_main_t;
 
 typedef enum ipsec_format_flags_t_
@@ -266,7 +271,8 @@ u32 ipsec_register_esp_backend (vlib_main_t * vm, ipsec_main_t * im,
 				const char *esp6_decrypt_node_name,
 				const char *esp6_decrypt_tun_node_name,
 				check_support_cb_t esp_check_support_cb,
-				add_del_sa_sess_cb_t esp_add_del_sa_sess_cb);
+				add_del_sa_sess_cb_t esp_add_del_sa_sess_cb,
+				enable_disable_cb_t enable_disable_cb);
 
 int ipsec_select_ah_backend (ipsec_main_t * im, u32 ah_backend_idx);
 int ipsec_select_esp_backend (ipsec_main_t * im, u32 esp_backend_idx);
@@ -282,6 +288,7 @@ ipsec_sa_get (u32 sa_index)
 void ipsec_add_feature (const char *arc_name, const char *node_name,
 			u32 * out_feature_index);
 
+void ipsec_set_async_mode (u32 is_enabled);
 
 #endif /* __IPSEC_H__ */
 
diff --git a/src/vnet/ipsec/ipsec_cli.c b/src/vnet/ipsec/ipsec_cli.c
index 7779e79f067..13f9efdf566 100644
--- a/src/vnet/ipsec/ipsec_cli.c
+++ b/src/vnet/ipsec/ipsec_cli.c
@@ -414,6 +414,9 @@ show_ipsec_command_fn (vlib_main_t * vm,
   ipsec_spd_bindings_show_all (vm, im);
   ipsec_tun_protect_walk (ipsec_tun_protect_show_one, vm);
 
+  vlib_cli_output (vm, "IPSec async mode: %s",
+		   (im->async_mode ? "on" : "off"));
+
   return 0;
 }
 
@@ -1038,6 +1041,41 @@ ipsec_cli_init (vlib_main_t * vm)
 
 VLIB_INIT_FUNCTION (ipsec_cli_init);
 
+static clib_error_t *
+set_async_mode_command_fn (vlib_main_t * vm, unformat_input_t * input,
+			   vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  int async_enable = 0;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "on"))
+	async_enable = 1;
+      else if (unformat (line_input, "off"))
+	async_enable = 0;
+      else
+	return (clib_error_return (0, "unknown input '%U'",
+				   format_unformat_error, line_input));
+    }
+
+  vnet_crypto_request_async_mode (async_enable);
+  ipsec_set_async_mode (async_enable);
+
+  unformat_free (line_input);
+  return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (set_async_mode_command, static) = {
+    .path = "set ipsec async mode",
+    .short_help = "set ipsec async mode on|off",
+    .function = set_async_mode_command_fn,
+};
+/* *INDENT-ON* */
 
 /*
  * fd.io coding-style-patch-verification: ON
diff --git a/src/vnet/ipsec/ipsec_sa.c b/src/vnet/ipsec/ipsec_sa.c
index 0e1e63d0db4..f60566cba79 100644
--- a/src/vnet/ipsec/ipsec_sa.c
+++ b/src/vnet/ipsec/ipsec_sa.c
@@ -100,8 +100,8 @@ ipsec_sa_set_crypto_alg (ipsec_sa_t * sa, ipsec_crypto_alg_t crypto_alg)
   sa->crypto_alg = crypto_alg;
   sa->crypto_iv_size = im->crypto_algs[crypto_alg].iv_size;
   sa->crypto_block_size = im->crypto_algs[crypto_alg].block_size;
-  sa->crypto_enc_op_id = im->crypto_algs[crypto_alg].enc_op_id;
-  sa->crypto_dec_op_id = im->crypto_algs[crypto_alg].dec_op_id;
+  sa->sync_op_data.crypto_enc_op_id = im->crypto_algs[crypto_alg].enc_op_id;
+  sa->sync_op_data.crypto_dec_op_id = im->crypto_algs[crypto_alg].dec_op_id;
   sa->crypto_calg = im->crypto_algs[crypto_alg].alg;
   ASSERT (sa->crypto_iv_size <= ESP_MAX_IV_SIZE);
   ASSERT (sa->crypto_block_size <= ESP_MAX_BLOCK_SIZE);
@@ -118,11 +118,54 @@ ipsec_sa_set_integ_alg (ipsec_sa_t * sa, ipsec_integ_alg_t integ_alg)
   ipsec_main_t *im = &ipsec_main;
   sa->integ_alg = integ_alg;
   sa->integ_icv_size = im->integ_algs[integ_alg].icv_size;
-  sa->integ_op_id = im->integ_algs[integ_alg].op_id;
+  sa->sync_op_data.integ_op_id = im->integ_algs[integ_alg].op_id;
   sa->integ_calg = im->integ_algs[integ_alg].alg;
   ASSERT (sa->integ_icv_size <= ESP_MAX_ICV_SIZE);
 }
 
+void
+ipsec_sa_set_async_op_ids (ipsec_sa_t * sa)
+{
+  /* *INDENT-OFF* */
+  if (ipsec_sa_is_set_USE_ESN (sa))
+    {
+#define _(n, s, k) \
+  if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##n##_ENC ) \
+    sa->async_op_data.crypto_async_enc_op_id = \
+      VNET_CRYPTO_OP_##n##_TAG16_AAD12_ENC; \
+  if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##n##_DEC ) \
+    sa->async_op_data.crypto_async_dec_op_id = \
+      VNET_CRYPTO_OP_##n##_TAG16_AAD12_DEC;
+    foreach_crypto_aead_alg
+#undef _
+    }
+  else
+    {
+#define _(n, s, k) \
+  if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##n##_ENC ) \
+    sa->async_op_data.crypto_async_enc_op_id = \
+      VNET_CRYPTO_OP_##n##_TAG16_AAD8_ENC; \
+  if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##n##_DEC ) \
+    sa->async_op_data.crypto_async_dec_op_id = \
+      VNET_CRYPTO_OP_##n##_TAG16_AAD8_DEC;
+    foreach_crypto_aead_alg
+#undef _
+    }
+
+#define _(c, h, s, k ,d) \
+  if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##c##_ENC && \
+      sa->sync_op_data.integ_op_id == VNET_CRYPTO_OP_##h##_HMAC) \
+    sa->async_op_data.crypto_async_enc_op_id = \
+      VNET_CRYPTO_OP_##c##_##h##_TAG##d##_ENC; \
+  if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##c##_DEC && \
+      sa->sync_op_data.integ_op_id == VNET_CRYPTO_OP_##h##_HMAC) \
+    sa->async_op_data.crypto_async_dec_op_id = \
+      VNET_CRYPTO_OP_##c##_##h##_TAG##d##_DEC;
+  foreach_crypto_link_async_alg
+#undef _
+  /* *INDENT-ON* */
+}
+
 int
 ipsec_sa_add_and_lock (u32 id,
 		       u32 spi,
@@ -172,6 +215,8 @@ ipsec_sa_add_and_lock (u32 id,
       clib_memcpy (&sa->integ_key, ik, sizeof (sa->integ_key));
     }
   ipsec_sa_set_crypto_alg (sa, crypto_alg);
+  ipsec_sa_set_async_op_ids (sa);
+
   clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
   ip46_address_copy (&sa->tunnel_src_addr, tun_src);
   ip46_address_copy (&sa->tunnel_dst_addr, tun_dst);
@@ -198,6 +243,19 @@ ipsec_sa_add_and_lock (u32 id,
 	}
     }
 
+  if (sa->async_op_data.crypto_async_enc_op_id &&
+      !ipsec_sa_is_set_IS_AEAD (sa))
+    {				//AES-CBC & HMAC
+      sa->async_op_data.linked_key_index =
+	vnet_crypto_key_add_linked (vm, sa->crypto_key_index,
+				    sa->integ_key_index);
+    }
+
+  if (im->async_mode)
+    sa->crypto_op_data = sa->async_op_data.data;
+  else
+    sa->crypto_op_data = sa->sync_op_data.data;
+
   err = ipsec_check_support_cb (im, sa);
   if (err)
     {
diff --git a/src/vnet/ipsec/ipsec_sa.h b/src/vnet/ipsec/ipsec_sa.h
index 0997eb7d8bc..de9b51ea66a 100644
--- a/src/vnet/ipsec/ipsec_sa.h
+++ b/src/vnet/ipsec/ipsec_sa.h
@@ -127,9 +127,27 @@ typedef struct
 
   vnet_crypto_key_index_t crypto_key_index;
   vnet_crypto_key_index_t integ_key_index;
-  vnet_crypto_op_id_t crypto_enc_op_id:16;
-  vnet_crypto_op_id_t crypto_dec_op_id:16;
-  vnet_crypto_op_id_t integ_op_id:16;
+
+  /* Union data shared by sync and async ops, updated when mode is
+   * changed. */
+  union
+  {
+    struct
+    {
+      vnet_crypto_op_id_t crypto_enc_op_id:16;
+      vnet_crypto_op_id_t crypto_dec_op_id:16;
+      vnet_crypto_op_id_t integ_op_id:16;
+    };
+
+    struct
+    {
+      vnet_crypto_async_op_id_t crypto_async_enc_op_id:16;
+      vnet_crypto_async_op_id_t crypto_async_dec_op_id:16;
+      vnet_crypto_key_index_t linked_key_index;
+    };
+
+    u64 crypto_op_data;
+  };
 
   /* data accessed by dataplane code should be above this comment */
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
@@ -165,6 +183,28 @@ typedef struct
   /* Salt used in GCM modes - stored in network byte order */
   u32 salt;
   u64 gcm_iv_counter;
+
+  union
+  {
+    struct
+    {
+      vnet_crypto_op_id_t crypto_enc_op_id:16;
+      vnet_crypto_op_id_t crypto_dec_op_id:16;
+      vnet_crypto_op_id_t integ_op_id:16;
+    };
+    u64 data;
+  } sync_op_data;
+
+  union
+  {
+    struct
+    {
+      vnet_crypto_async_op_id_t crypto_async_enc_op_id:16;
+      vnet_crypto_async_op_id_t crypto_async_dec_op_id:16;
+      vnet_crypto_key_index_t linked_key_index;
+    };
+    u64 data;
+  } async_op_data;
 } ipsec_sa_t;
 
 STATIC_ASSERT_OFFSET_OF (ipsec_sa_t, cacheline1, CLIB_CACHE_LINE_BYTES);