b12b382ce646e5600441ec1dd381ab5ec26d551f
[vpp.git] / src / vnet / dpo / receive_dpo.c
1 /*
2  * Copyright (c) 2016 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /**
16  * @brief
17  * The data-path object representing receiveing the packet, i.e. it's for-us
18  */
19 #include <vlib/vlib.h>
20 #include <vnet/ip/ip.h>
21 #include <vnet/dpo/receive_dpo.h>
22
23 /**
24  * @brief pool of all receive DPOs
25  */
26 receive_dpo_t *receive_dpo_pool;
27
28 int
29 dpo_is_receive (const dpo_id_t *dpo)
30 {
31     return (dpo->dpoi_type == DPO_RECEIVE);
32 }
33
34 static receive_dpo_t *
35 receive_dpo_alloc (void)
36 {
37     receive_dpo_t *rd;
38     vlib_main_t *vm;
39     u8 did_barrier_sync;
40
41     dpo_pool_barrier_sync (vm, receive_dpo_pool, did_barrier_sync);
42     pool_get_aligned(receive_dpo_pool, rd, CLIB_CACHE_LINE_BYTES);
43     dpo_pool_barrier_release (vm, did_barrier_sync);
44
45     clib_memset(rd, 0, sizeof(*rd));
46
47     return (rd);
48 }
49
50 static receive_dpo_t *
51 receive_dpo_get_from_dpo (const dpo_id_t *dpo)
52 {
53     ASSERT(DPO_RECEIVE == dpo->dpoi_type);
54
55     return (receive_dpo_get(dpo->dpoi_index));
56 }
57
58
59 /*
60  * receive_dpo_add_or_lock
61  *
62  * The next_hop address here is used for source address selection in the DP.
63  * The local adj is added to an interface's receive prefix, the next-hop
64  * passed here is the local prefix on the same interface.
65  */
66 void
67 receive_dpo_add_or_lock (dpo_proto_t proto,
68                          u32 sw_if_index,
69                          const ip46_address_t *nh_addr,
70                          dpo_id_t *dpo)
71 {
72     receive_dpo_t *rd;
73
74     rd = receive_dpo_alloc();
75
76     rd->rd_sw_if_index = sw_if_index;
77     if (NULL != nh_addr)
78     {
79         rd->rd_addr = *nh_addr;
80     }
81
82     dpo_set(dpo, DPO_RECEIVE, proto, (rd - receive_dpo_pool));
83 }
84
85 static void
86 receive_dpo_lock (dpo_id_t *dpo)
87 {
88     receive_dpo_t *rd;
89
90     rd = receive_dpo_get_from_dpo(dpo);
91     rd->rd_locks++;
92 }
93
94 static void
95 receive_dpo_unlock (dpo_id_t *dpo)
96 {
97     receive_dpo_t *rd;
98
99     rd = receive_dpo_get_from_dpo(dpo);
100     rd->rd_locks--;
101
102     if (0 == rd->rd_locks)
103     {
104         pool_put(receive_dpo_pool, rd);
105     }
106 }
107
108 static u8*
109 format_receive_dpo (u8 *s, va_list *ap)
110 {
111     CLIB_UNUSED(index_t index) = va_arg(*ap, index_t);
112     CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
113     vnet_main_t * vnm = vnet_get_main();
114     receive_dpo_t *rd;
115
116     if (pool_is_free_index(receive_dpo_pool, index))
117     {
118         return (format(s, "dpo-receive DELETED"));
119     }
120
121     rd = receive_dpo_get(index);
122
123     if (~0 != rd->rd_sw_if_index)
124     {
125         return (format(s, "dpo-receive: %U on %U",
126                        format_ip46_address, &rd->rd_addr, IP46_TYPE_ANY,
127                        format_vnet_sw_interface_name, vnm,
128                        vnet_get_sw_interface(vnm, rd->rd_sw_if_index)));
129     }
130     else
131     {
132         return (format(s, "dpo-receive"));
133     }
134 }
135
136 static void
137 receive_dpo_mem_show (void)
138 {
139     fib_show_memory_usage("Receive",
140                           pool_elts(receive_dpo_pool),
141                           pool_len(receive_dpo_pool),
142                           sizeof(receive_dpo_t));
143 }
144
145 const static dpo_vft_t receive_vft = {
146     .dv_lock = receive_dpo_lock,
147     .dv_unlock = receive_dpo_unlock,
148     .dv_format = format_receive_dpo,
149     .dv_mem_show = receive_dpo_mem_show,
150 };
151
152 /**
153  * @brief The per-protocol VLIB graph nodes that are assigned to a receive
154  *        object.
155  *
156  * this means that these graph nodes are ones from which a receive is the
157  * parent object in the DPO-graph.
158  */
159 const static char* const receive_ip4_nodes[] =
160 {
161     "ip4-local",
162     NULL,
163 };
164 const static char* const receive_ip6_nodes[] =
165 {
166     "ip6-local",
167     NULL,
168 };
169
170 const static char* const * const receive_nodes[DPO_PROTO_NUM] =
171 {
172     [DPO_PROTO_IP4]  = receive_ip4_nodes,
173     [DPO_PROTO_IP6]  = receive_ip6_nodes,
174     [DPO_PROTO_MPLS] = NULL,
175 };
176
177 void
178 receive_dpo_module_init (void)
179 {
180     dpo_register(DPO_RECEIVE, &receive_vft, receive_nodes);
181 }