PPPoE usses a midchain adjacency stack on an interface-tx DPO

1) introduce an interface-tx DPO. This is a simple wrapper around a sw_if_index. enhance DPO stacking functions to allow per-instance next-nodes and hence allow children to stack onto the interface per-instance tx node and not on 'interface-output'.
2) update PPPoE code to use ta midchain stack on a interface-tx DPO of the encap-interface. This remove the need for pppoe_encap node (which is replaced by the adj-midchain-tx) and interface-output node is no longer used (see above). Since PPPoE encap node is no longer needed, the PPPoE seesion does not need to be retrieved in the data-path, hence the cahce misses are removed.

Change-Id: Id8b40f53daa14889a9c51d802e14fed7fba4399a
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 0 insertions, 446 deletions

diff --git a/src/vnet/dpo/interface_dpo.c b/src/vnet/dpo/interface_dpo.c
deleted file mode 100644
index 780bfa2a293..00000000000
--- a/src/vnet/dpo/interface_dpo.c
+++ /dev/null
@@ -1,446 +0,0 @@
-/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <vnet/dpo/interface_dpo.h>
-#include <vnet/fib/fib_node.h>
-
-/*
- * The 'DB' of interface DPOs.
- * There is only one  per-interface per-protocol, so this is a per-interface
- * vector
- */
-static index_t *interface_dpo_db[DPO_PROTO_NUM];
-
-static interface_dpo_t *
-interface_dpo_alloc (void)
-{
-    interface_dpo_t *ido;
-
-    pool_get(interface_dpo_pool, ido);
-
-    return (ido);
-}
-
-static inline interface_dpo_t *
-interface_dpo_get_from_dpo (const dpo_id_t *dpo)
-{
-    ASSERT(DPO_INTERFACE == dpo->dpoi_type);
-
-    return (interface_dpo_get(dpo->dpoi_index));
-}
-
-static inline index_t
-interface_dpo_get_index (interface_dpo_t *ido)
-{
-    return (ido - interface_dpo_pool);
-}
-
-static void
-interface_dpo_lock (dpo_id_t *dpo)
-{
-    interface_dpo_t *ido;
-
-    ido = interface_dpo_get_from_dpo(dpo);
-    ido->ido_locks++;
-}
-
-static void
-interface_dpo_unlock (dpo_id_t *dpo)
-{
-    interface_dpo_t *ido;
-
-    ido = interface_dpo_get_from_dpo(dpo);
-    ido->ido_locks--;
-
-    if (0 == ido->ido_locks)
-    {
-	interface_dpo_db[ido->ido_proto][ido->ido_sw_if_index] =
-            INDEX_INVALID;
-        pool_put(interface_dpo_pool, ido);
-    }
-}
-
-/*
- * interface_dpo_add_or_lock
- *
- * Add/create and lock a new or lock an existing for the interface DPO
- * on the interface and protocol given
- */
-void
-interface_dpo_add_or_lock (dpo_proto_t proto,
-                           u32 sw_if_index,
-                           dpo_id_t *dpo)
-{
-    interface_dpo_t *ido;
-
-    vec_validate_init_empty(interface_dpo_db[proto],
-                            sw_if_index,
-                            INDEX_INVALID);
-
-    if (INDEX_INVALID == interface_dpo_db[proto][sw_if_index])
-    {
-	ido = interface_dpo_alloc();
-
-        ido->ido_sw_if_index = sw_if_index;
-        ido->ido_proto = proto;
-
-	interface_dpo_db[proto][sw_if_index] =
-            interface_dpo_get_index(ido);
-    }
-    else
-    {
-	ido = interface_dpo_get(interface_dpo_db[proto][sw_if_index]);
-    }
-
-    dpo_set(dpo, DPO_INTERFACE, proto, interface_dpo_get_index(ido));
-}
-
-
-static clib_error_t *
-interface_dpo_interface_state_change (vnet_main_t * vnm,
-                                      u32 sw_if_index,
-                                      u32 flags)
-{
-    /*
-     */
-    return (NULL);
-}
-
-VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(
-    interface_dpo_interface_state_change);
-
-/**
- * @brief Registered callback for HW interface state changes
- */
-static clib_error_t *
-interface_dpo_hw_interface_state_change (vnet_main_t * vnm,
-                                         u32 hw_if_index,
-                                         u32 flags)
-{
-    return (NULL);
-}
-
-VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(
-    interface_dpo_hw_interface_state_change);
-
-static clib_error_t *
-interface_dpo_interface_delete (vnet_main_t * vnm,
-                                u32 sw_if_index,
-                                u32 is_add)
-{
-    return (NULL);
-}
-
-VNET_SW_INTERFACE_ADD_DEL_FUNCTION(
-    interface_dpo_interface_delete);
-
-u8*
-format_interface_dpo (u8* s, va_list *ap)
-{
-    index_t index = va_arg(*ap, index_t);
-    CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
-    vnet_main_t * vnm = vnet_get_main();
-    interface_dpo_t *ido = interface_dpo_get(index);
-
-    return (format(s, "%U-dpo: %U",
-                   format_vnet_sw_interface_name,
-                   vnm,
-                   vnet_get_sw_interface(vnm, ido->ido_sw_if_index),
-                   format_dpo_proto, ido->ido_proto));
-}
-
-static void
-interface_dpo_mem_show (void)
-{
-    fib_show_memory_usage("Interface",
-			  pool_elts(interface_dpo_pool),
-			  pool_len(interface_dpo_pool),
-			  sizeof(interface_dpo_t));
-}
-
-
-const static dpo_vft_t interface_dpo_vft = {
-    .dv_lock = interface_dpo_lock,
-    .dv_unlock = interface_dpo_unlock,
-    .dv_format = format_interface_dpo,
-    .dv_mem_show = interface_dpo_mem_show,
-};
-
-/**
- * @brief The per-protocol VLIB graph nodes that are assigned to a glean
- *        object.
- *
- * this means that these graph nodes are ones from which a glean is the
- * parent object in the DPO-graph.
- */
-const static char* const interface_dpo_ip4_nodes[] =
-{
-    "interface-dpo-ip4",
-    NULL,
-};
-const static char* const interface_dpo_ip6_nodes[] =
-{
-    "interface-dpo-ip4",
-    NULL,
-};
-const static char* const interface_dpo_l2_nodes[] =
-{
-    "interface-dpo-l2",
-    NULL,
-};
-
-const static char* const * const interface_dpo_nodes[DPO_PROTO_NUM] =
-{
-    [DPO_PROTO_IP4]  = interface_dpo_ip4_nodes,
-    [DPO_PROTO_IP6]  = interface_dpo_ip6_nodes,
-    [DPO_PROTO_ETHERNET]  = interface_dpo_l2_nodes,
-    [DPO_PROTO_MPLS] = NULL,
-};
-
-void
-interface_dpo_module_init (void)
-{
-    dpo_register(DPO_INTERFACE,
-                 &interface_dpo_vft,
-                 interface_dpo_nodes);
-}
-
-/**
- * @brief Interface DPO trace data
- */
-typedef struct interface_dpo_trace_t_
-{
-    u32 sw_if_index;
-} interface_dpo_trace_t;
-
-typedef enum interface_dpo_next_t_
-{
-    INTERFACE_DPO_DROP = 0,
-    INTERFACE_DPO_INPUT = 1,
-} interface_dpo_next_t;
-
-always_inline uword
-interface_dpo_inline (vlib_main_t * vm,
-                      vlib_node_runtime_t * node,
-                      vlib_frame_t * from_frame)
-{
-    u32 n_left_from, next_index, * from, * to_next;
-    u32 thread_index = vlib_get_thread_index ();
-    vnet_interface_main_t *im;
-
-    im = &vnet_get_main ()->interface_main;
-    from = vlib_frame_vector_args (from_frame);
-    n_left_from = from_frame->n_vectors;
-
-    next_index = node->cached_next_index;
-
-    while (n_left_from > 0)
-    {
-        u32 n_left_to_next;
-
-        vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
-
-	while (n_left_from >= 4 && n_left_to_next > 2)
-	{
-	    const interface_dpo_t *ido0, *ido1;
-	    u32 bi0, idoi0, bi1, idoi1;
-	    vlib_buffer_t *b0, *b1;
-
-	    bi0 = from[0];
-	    to_next[0] = bi0;
-	    bi1 = from[1];
-	    to_next[1] = bi1;
-	    from += 2;
-	    to_next += 2;
-	    n_left_from -= 2;
-	    n_left_to_next -= 2;
-
-	    b0 = vlib_get_buffer (vm, bi0);
-	    b1 = vlib_get_buffer (vm, bi1);
-
-	    idoi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
-	    idoi1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
-	    ido0 = interface_dpo_get(idoi0);
-	    ido1 = interface_dpo_get(idoi1);
-
-	    vnet_buffer(b0)->sw_if_index[VLIB_RX] = ido0->ido_sw_if_index;
-	    vnet_buffer(b1)->sw_if_index[VLIB_RX] = ido1->ido_sw_if_index;
-
-            vlib_increment_combined_counter (im->combined_sw_if_counters
-                                             + VNET_INTERFACE_COUNTER_RX,
-                                             thread_index,
-                                             ido0->ido_sw_if_index,
-                                             1,
-                                             vlib_buffer_length_in_chain (vm, b0));
-            vlib_increment_combined_counter (im->combined_sw_if_counters
-                                             + VNET_INTERFACE_COUNTER_RX,
-                                             thread_index,
-                                             ido1->ido_sw_if_index,
-                                             1,
-                                             vlib_buffer_length_in_chain (vm, b1));
-
-	    if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
-	    {
-		interface_dpo_trace_t *tr0;
-
-                tr0 = vlib_add_trace (vm, node, b0, sizeof (*tr0));
-		tr0->sw_if_index = ido0->ido_sw_if_index;
-	    }
-	    if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
-	    {
-		interface_dpo_trace_t *tr1;
-
-                tr1 = vlib_add_trace (vm, node, b1, sizeof (*tr1));
-		tr1->sw_if_index = ido1->ido_sw_if_index;
-	    }
-
-	    vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
-					    n_left_to_next, bi0, bi1,
-                                            INTERFACE_DPO_INPUT,
-                                            INTERFACE_DPO_INPUT);
-	}
-
-	while (n_left_from > 0 && n_left_to_next > 0)
-	{
-	    const interface_dpo_t * ido0;
-	    vlib_buffer_t * b0;
-	    u32 bi0, idoi0;
-
-	    bi0 = from[0];
-	    to_next[0] = bi0;
-	    from += 1;
-	    to_next += 1;
-	    n_left_from -= 1;
-	    n_left_to_next -= 1;
-
-	    b0 = vlib_get_buffer (vm, bi0);
-
-	    idoi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
-	    ido0 = interface_dpo_get(idoi0);
-
-            /* Swap the RX interface of the packet to the one the
-             * interface DPR represents */
-	    vnet_buffer(b0)->sw_if_index[VLIB_RX] = ido0->ido_sw_if_index;
-
-            /* Bump the interface's RX coutners */
-            vlib_increment_combined_counter (im->combined_sw_if_counters
-                                             + VNET_INTERFACE_COUNTER_RX,
-                                             thread_index,
-                                             ido0->ido_sw_if_index,
-                                             1,
-                                             vlib_buffer_length_in_chain (vm, b0));
-
-	    if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
-	    {
-		interface_dpo_trace_t *tr;
-
-                tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
-		tr->sw_if_index = ido0->ido_sw_if_index;
-	    }
-
-	    vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
-					    n_left_to_next, bi0,
-                                            INTERFACE_DPO_INPUT);
-	}
-        vlib_put_next_frame (vm, node, next_index, n_left_to_next);
-    }
-    return from_frame->n_vectors;
-}
-
-static u8 *
-format_interface_dpo_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 *);
-    interface_dpo_trace_t * t = va_arg (*args, interface_dpo_trace_t *);
-    uword indent = format_get_indent (s);
-    s = format (s, "%U sw_if_index:%d",
-                format_white_space, indent,
-                t->sw_if_index);
-    return s;
-}
-
-static uword
-interface_dpo_ip4 (vlib_main_t * vm,
-                   vlib_node_runtime_t * node,
-                   vlib_frame_t * from_frame)
-{
-    return (interface_dpo_inline(vm, node, from_frame));
-}
-
-static uword
-interface_dpo_ip6 (vlib_main_t * vm,
-                   vlib_node_runtime_t * node,
-                   vlib_frame_t * from_frame)
-{
-    return (interface_dpo_inline(vm, node, from_frame));
-}
-
-static uword
-interface_dpo_l2 (vlib_main_t * vm,
-                   vlib_node_runtime_t * node,
-                   vlib_frame_t * from_frame)
-{
-    return (interface_dpo_inline(vm, node, from_frame));
-}
-
-VLIB_REGISTER_NODE (interface_dpo_ip4_node) = {
-    .function = interface_dpo_ip4,
-    .name = "interface-dpo-ip4",
-    .vector_size = sizeof (u32),
-    .format_trace = format_interface_dpo_trace,
-
-    .n_next_nodes = 2,
-    .next_nodes = {
-        [INTERFACE_DPO_DROP] = "ip4-drop",
-        [INTERFACE_DPO_INPUT] = "ip4-input",
-    },
-};
-
-VLIB_NODE_FUNCTION_MULTIARCH (interface_dpo_ip4_node,
-                              interface_dpo_ip4)
-
-VLIB_REGISTER_NODE (interface_dpo_ip6_node) = {
-    .function = interface_dpo_ip6,
-    .name = "interface-dpo-ip6",
-    .vector_size = sizeof (u32),
-    .format_trace = format_interface_dpo_trace,
-
-    .n_next_nodes = 2,
-    .next_nodes = {
-        [INTERFACE_DPO_DROP] = "ip6-drop",
-        [INTERFACE_DPO_INPUT] = "ip6-input",
-    },
-};
-
-VLIB_NODE_FUNCTION_MULTIARCH (interface_dpo_ip6_node,
-                              interface_dpo_ip6)
-
-VLIB_REGISTER_NODE (interface_dpo_l2_node) = {
-    .function = interface_dpo_l2,
-    .name = "interface-dpo-l2",
-    .vector_size = sizeof (u32),
-    .format_trace = format_interface_dpo_trace,
-
-    .n_next_nodes = 2,
-    .next_nodes = {
-        [INTERFACE_DPO_DROP] = "error-drop",
-        [INTERFACE_DPO_INPUT] = "l2-input",
-    },
-};
-
-VLIB_NODE_FUNCTION_MULTIARCH (interface_dpo_l2_node,
-                              interface_dpo_l2)
-