ioam: configuration for SRv6 localsid (VPP-693)

This add debug cli to accept SRv6 localsid that will be
used to attract the return traffic for M-Anycast flows.

Change-Id: I8f8dd115c36498141ae4cb143c6584141950b1d3
Signed-off-by: shwethab <shwetha.bhandari@gmail.com>
(cherry picked from commit 00c14a94c34fac89e6e589c4a7aad20d8dd183dc)

4 files changed, 54 insertions, 23 deletions

diff --git a/src/plugins/ioam/ip6/ioam_cache.c b/src/plugins/ioam/ip6/ioam_cache.c
index 92e7075d680..4c9997f4923 100644
--- a/src/plugins/ioam/ip6/ioam_cache.c
+++ b/src/plugins/ioam/ip6/ioam_cache.c
@@ -94,13 +94,16 @@ ioam_e2e_cache_trace_handler (u8 * s, ip6_hop_by_hop_option_t * opt)
 
 /* Action function shared between message handler and debug CLI */
 int
-ioam_cache_ip6_enable_disable (ioam_cache_main_t * em, u8 is_disable)
+ioam_cache_ip6_enable_disable (ioam_cache_main_t * em,
+			       ip6_address_t * sr_localsid, u8 is_disable)
 {
   vlib_main_t *vm = em->vlib_main;
 
   if (is_disable == 0)
     {
       ioam_cache_table_init (vm);
+      em->sr_localsid_cache.as_u64[0] = sr_localsid->as_u64[0];
+      em->sr_localsid_cache.as_u64[1] = sr_localsid->as_u64[1];
       ip6_hbh_set_next_override (em->cache_hbh_slot);
       ip6_hbh_register_option (HBH_OPTION_TYPE_IOAM_EDGE_TO_EDGE_ID,
 			       0, ioam_e2e_id_trace_handler);
@@ -112,6 +115,8 @@ ioam_cache_ip6_enable_disable (ioam_cache_main_t * em, u8 is_disable)
     {
       ip6_hbh_set_next_override (IP6_LOOKUP_NEXT_POP_HOP_BY_HOP);
       ioam_cache_table_destroy (vm);
+      em->sr_localsid_cache.as_u64[0] = 0;
+      em->sr_localsid_cache.as_u64[1] = 0;
       ip6_hbh_unregister_option (HBH_OPTION_TYPE_IOAM_EDGE_TO_EDGE_ID);
       ip6_hbh_unregister_option (HBH_OPTION_TYPE_IOAM_E2E_CACHE_ID);
     }
@@ -123,7 +128,9 @@ ioam_cache_ip6_enable_disable (ioam_cache_main_t * em, u8 is_disable)
 int
 ioam_tunnel_select_ip6_enable_disable (ioam_cache_main_t * em,
 				       u8 criteria,
-				       u8 no_of_responses, u8 is_disable)
+				       u8 no_of_responses,
+				       ip6_address_t * sr_localsid,
+				       u8 is_disable)
 {
   vlib_main_t *vm = em->vlib_main;
 
@@ -132,6 +139,8 @@ ioam_tunnel_select_ip6_enable_disable (ioam_cache_main_t * em,
       ioam_cache_ts_table_init (vm);
       em->criteria_oneway = criteria;
       em->wait_for_responses = no_of_responses;
+      em->sr_localsid_ts.as_u64[0] = sr_localsid->as_u64[0];
+      em->sr_localsid_ts.as_u64[1] = sr_localsid->as_u64[1];
       ip6_hbh_set_next_override (em->ts_hbh_slot);
       ip6_ioam_ts_cache_set_rewrite ();
       ip6_hbh_register_option (HBH_OPTION_TYPE_IOAM_EDGE_TO_EDGE_ID,
@@ -146,6 +155,8 @@ ioam_tunnel_select_ip6_enable_disable (ioam_cache_main_t * em,
     {
       ioam_cache_ts_timer_node_enable (vm, 0);
       ip6_hbh_set_next_override (IP6_LOOKUP_NEXT_POP_HOP_BY_HOP);
+      em->sr_localsid_ts.as_u64[0] = 0;
+      em->sr_localsid_ts.as_u64[1] = 0;
       ioam_cache_ts_table_destroy (vm);
       ip6_ioam_ts_cache_cleanup_rewrite ();
       ip6_hbh_unregister_option (HBH_OPTION_TYPE_IOAM_EDGE_TO_EDGE_ID);
@@ -161,9 +172,13 @@ static void vl_api_ioam_cache_ip6_enable_disable_t_handler
 {
   vl_api_ioam_cache_ip6_enable_disable_reply_t *rmp;
   ioam_cache_main_t *cm = &ioam_cache_main;
+  ip6_address_t sr_localsid;
   int rv;
 
-  rv = ioam_cache_ip6_enable_disable (cm, (int) (mp->is_disable));
+  sr_localsid.as_u64[0] = 0;
+  sr_localsid.as_u64[1] = 0;
+  rv =
+    ioam_cache_ip6_enable_disable (cm, &sr_localsid, (int) (mp->is_disable));
   REPLY_MACRO (VL_API_IOAM_CACHE_IP6_ENABLE_DISABLE_REPLY);
 }
 
@@ -205,15 +220,25 @@ set_ioam_cache_command_fn (vlib_main_t * vm,
 {
   ioam_cache_main_t *em = &ioam_cache_main;
   u8 is_disable = 0;
+  ip6_address_t sr_localsid;
+  u8 address_set = 0;
 
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
       if (unformat (input, "disable"))
 	is_disable = 1;
+      else if (!address_set
+	       && unformat (input, "sr_localsid %U", unformat_ip6_address,
+			    &sr_localsid))
+	address_set = 1;
       else
 	break;
     }
-  ioam_cache_ip6_enable_disable (em, is_disable);
+
+  if (is_disable == 0 && !address_set)
+    return clib_error_return (0, "Error: SRv6 LocalSID address is mandatory");
+
+  ioam_cache_ip6_enable_disable (em, &sr_localsid, is_disable);
 
   return 0;
 }
@@ -222,7 +247,8 @@ set_ioam_cache_command_fn (vlib_main_t * vm,
 VLIB_CLI_COMMAND (set_ioam_cache_command, static) =
 {
 .path = "set ioam ip6 cache",.short_help =
-    "set ioam ip6 cache [disable]",.function = set_ioam_cache_command_fn};
+    "set ioam ip6 cache sr_localsid <ip6 address> [disable]",.function =
+    set_ioam_cache_command_fn};
 /* *INDENT_ON* */
 
 #define IOAM_TS_WAIT_FOR_RESPONSES 3
@@ -234,7 +260,10 @@ set_ioam_tunnel_select_command_fn (vlib_main_t * vm,
   ioam_cache_main_t *em = &ioam_cache_main;
   u8 is_disable = 0;
   u8 one_way = 0;
+  ip6_address_t sr_localsid;
+  u8 address_set = 0;
   u8 no_of_responses = IOAM_TS_WAIT_FOR_RESPONSES;
+
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
       if (unformat (input, "disable"))
@@ -245,12 +274,19 @@ set_ioam_tunnel_select_command_fn (vlib_main_t * vm,
 	one_way = 1;
       else if (unformat (input, "wait_for_responses %d", &no_of_responses))
 	;
+      else if (!address_set
+	       && unformat (input, "sr_localsid %U", unformat_ip6_address,
+			    &sr_localsid))
+	address_set = 1;
       else
 	break;
     }
+  if (is_disable == 0 && !address_set)
+    return clib_error_return (0,
+			      "Error: SRv6 LocalSID address is mandatory to receive response.");
 
   ioam_tunnel_select_ip6_enable_disable (em, one_way, no_of_responses,
-					 is_disable);
+					 &sr_localsid, is_disable);
 
   return 0;
 }
@@ -259,8 +295,8 @@ set_ioam_tunnel_select_command_fn (vlib_main_t * vm,
 VLIB_CLI_COMMAND (set_ioam_cache_ts_command, static) =
 {
 .path = "set ioam ip6 sr-tunnel-select",.short_help =
-    "set ioam ip6 sr-tunnel-select [disable] [oneway|rtt] [wait_for_responses <n|default 3>]",.function
-    = set_ioam_tunnel_select_command_fn};
+    "set ioam ip6 sr-tunnel-select [disable] [oneway|rtt] [wait_for_responses <n|default 3>] \
+  [sr_localsid <ip6 address>]",.function = set_ioam_tunnel_select_command_fn};
 /* *INDENT_ON* */
 
 static void
diff --git a/src/plugins/ioam/ip6/ioam_cache.h b/src/plugins/ioam/ip6/ioam_cache.h
index e668ad7f5b4..25a8fb65729 100644
--- a/src/plugins/ioam/ip6/ioam_cache.h
+++ b/src/plugins/ioam/ip6/ioam_cache.h
@@ -173,6 +173,7 @@ typedef struct
   /* The current rewrite string being used */
   u8 *rewrite;
   u8 rewrite_pool_index_offset;
+  ip6_address_t sr_localsid_cache;
 
   u64 lookup_table_nbuckets;
   u64 lookup_table_size;
@@ -190,6 +191,7 @@ typedef struct
    */
   bool criteria_oneway;
   u8 wait_for_responses;
+  ip6_address_t sr_localsid_ts;
 
   /* convenience */
   vlib_main_t *vlib_main;
@@ -276,17 +278,11 @@ typedef CLIB_PACKED (struct
 
 static inline void
 ioam_e2e_id_rewrite_handler (ioam_e2e_id_option_t * e2e_option,
-			     vlib_buffer_t * b0)
+			     ip6_address_t * address)
 {
-  ip6_main_t *im = &ip6_main;
-  ip6_address_t *my_address = 0;
-  my_address =
-    ip6_interface_first_address (im, vnet_buffer (b0)->sw_if_index[VLIB_RX]);
-  if (my_address)
-    {
-      e2e_option->id.as_u64[0] = my_address->as_u64[0];
-      e2e_option->id.as_u64[1] = my_address->as_u64[1];
-    }
+  e2e_option->id.as_u64[0] = address->as_u64[0];
+  e2e_option->id.as_u64[1] = address->as_u64[1];
+
 }
 
 /* Following functions are for the caching of ioam header
@@ -400,7 +396,7 @@ ioam_cache_add (vlib_buffer_t * b0,
 
   /* suffix rewrite string with e2e ID option */
   e2e = (ioam_e2e_id_option_t *) (entry->ioam_rewrite_string + e2e_id_offset);
-  ioam_e2e_id_rewrite_handler (e2e, b0);
+  ioam_e2e_id_rewrite_handler (e2e, &cm->sr_localsid_cache);
   entry->my_address_offset = (u8 *) (&e2e->id) - (u8 *) hbh0;
 
   /* add it to hash, replacing and freeing any collision for now */
diff --git a/src/plugins/ioam/ip6/ioam_cache_node.c b/src/plugins/ioam/ip6/ioam_cache_node.c
index d930f3395dc..dd27e127a09 100644
--- a/src/plugins/ioam/ip6/ioam_cache_node.c
+++ b/src/plugins/ioam/ip6/ioam_cache_node.c
@@ -355,7 +355,6 @@ ip6_add_from_cache_hbh_node_fn (vlib_main_t * vm,
 	  clib_memcpy (&srh0->segments[1],
 		       (u8 *) hbh0 + entry->my_address_offset,
 		       sizeof (ip6_address_t));
-	  srh0->segments_left--;
 	  ioam_cache_entry_free (entry);
 
 	  /* Patch the protocol chain, insert the h-b-h (type 0) header */
diff --git a/src/plugins/ioam/ip6/ioam_cache_tunnel_select_node.c b/src/plugins/ioam/ip6/ioam_cache_tunnel_select_node.c
index ca06607d06c..79ee58eccda 100644
--- a/src/plugins/ioam/ip6/ioam_cache_tunnel_select_node.c
+++ b/src/plugins/ioam/ip6/ioam_cache_tunnel_select_node.c
@@ -424,7 +424,7 @@ ip6_reset_ts_hbh_node_fn (vlib_main_t * vm,
 	      ioam_e2e_id_rewrite_handler ((ioam_e2e_id_option_t *)
 					   ((u8 *) e2e +
 					    sizeof (ioam_e2e_cache_option_t)),
-					   b0);
+					   &cm->sr_localsid_ts);
 	      /* Patch the protocol chain, insert the h-b-h (type 0) header */
 	      hbh0->protocol = ip0->protocol;
 	      ip0->protocol = 0;
@@ -484,7 +484,7 @@ ip6_reset_ts_hbh_node_fn (vlib_main_t * vm,
 	      ioam_e2e_id_rewrite_handler ((ioam_e2e_id_option_t *)
 					   ((u8 *) e2e +
 					    sizeof (ioam_e2e_cache_option_t)),
-					   b1);
+					   &cm->sr_localsid_ts);
 	      /* Patch the protocol chain, insert the h-b-h (type 0) header */
 	      hbh1->protocol = ip1->protocol;
 	      ip1->protocol = 0;
@@ -590,7 +590,7 @@ ip6_reset_ts_hbh_node_fn (vlib_main_t * vm,
 	      ioam_e2e_id_rewrite_handler ((ioam_e2e_id_option_t *)
 					   ((u8 *) e2e +
 					    sizeof (ioam_e2e_cache_option_t)),
-					   b0);
+					   &cm->sr_localsid_ts);
 	      /* Patch the protocol chain, insert the h-b-h (type 0) header */
 	      hbh0->protocol = ip0->protocol;
 	      ip0->protocol = 0;