ipsec: One DPO per SA

An SA can be used only for ESP or AH nver both, so it needs only one
coresponding DPO.

Type: refactor

Change-Id: I689060f795ee352245a0eaed0890a6b234c63d71
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/ipsec/ipsec_sa.h b/src/vnet/ipsec/ipsec_sa.h
index 969b5d1..53035aa 100644
--- a/src/vnet/ipsec/ipsec_sa.h
+++ b/src/vnet/ipsec/ipsec_sa.h
@@ -71,8 +71,6 @@
   IPSEC_PROTOCOL_ESP = 1
 } ipsec_protocol_t;
 
-#define IPSEC_N_PROTOCOLS (IPSEC_PROTOCOL_ESP+1)
-
 #define IPSEC_KEY_MAX_LEN 128
 typedef struct ipsec_key_t_
 {
@@ -124,6 +122,7 @@
   u32 last_seq;
   u32 last_seq_hi;
   u64 replay_window;
+  dpo_id_t dpo;
 
   vnet_crypto_key_index_t crypto_key_index;
   vnet_crypto_key_index_t integ_key_index;
@@ -131,8 +130,6 @@
   vnet_crypto_op_id_t crypto_dec_op_id:16;
   vnet_crypto_op_id_t integ_op_id:16;
 
-  dpo_id_t dpo[IPSEC_N_PROTOCOLS];
-
   /* data accessed by dataplane code should be above this comment */
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);