ipsec: Support async mode per-SA

Type: feature

This feautre only applies to ESP not AH SAs.
As well as the gobal switch for ayncs mode, allow individual SAs to be
async.
If global async is on, all SAs are async. If global async mode is off,
then if then an SA can be individually set to async. This preserves the
global switch behaviour.

the stratergy in the esp encrypt.decrypt nodes is to separate the frame
into, 1) sync buffers, 2) async buffers and 3) no-op buffers.
Sync buffer will undergo a cyrpto/ath operation, no-op will not, they
are dropped or handed-off.

Signed-off-by: Neale Ranns <neale@graphiant.com>
Change-Id: Ifc15b10b870b19413ad030ce7f92ed56275d6791

1 files changed, 11 insertions, 1 deletions

diff --git a/src/vnet/ipsec/ipsec_sa.c b/src/vnet/ipsec/ipsec_sa.c
index 7e2dc20ef90..b1e337470ab 100644
--- a/src/vnet/ipsec/ipsec_sa.c
+++ b/src/vnet/ipsec/ipsec_sa.c
@@ -245,7 +245,15 @@ ipsec_sa_add_and_lock (u32 id, u32 spi, ipsec_protocol_t proto,
   if (im->async_mode)
     sa->crypto_op_data = sa->async_op_data.data;
   else
-    sa->crypto_op_data = sa->sync_op_data.data;
+    {
+      if (ipsec_sa_is_set_IS_ASYNC (sa))
+	{
+	  vnet_crypto_request_async_mode (1);
+	  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)
@@ -332,6 +340,8 @@ ipsec_sa_del (ipsec_sa_t * sa)
   /* no recovery possible when deleting an SA */
   (void) ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
 
+  if (ipsec_sa_is_set_IS_ASYNC (sa))
+    vnet_crypto_request_async_mode (0);
   if (ipsec_sa_is_set_UDP_ENCAP (sa) && ipsec_sa_is_set_IS_INBOUND (sa))
     ipsec_unregister_udp_port (clib_net_to_host_u16 (sa->udp_hdr.dst_port));