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Diffstat (limited to 'src/vlib/mc.h')
| -rw-r--r-- | src/vlib/mc.h | 687 |
1 files changed, 687 insertions, 0 deletions
diff --git a/src/vlib/mc.h b/src/vlib/mc.h new file mode 100644 index 00000000..dc95b0e9 --- /dev/null +++ b/src/vlib/mc.h @@ -0,0 +1,687 @@ +/* + * mc.h: vlib reliable sequenced multicast distributed applications + * + * Copyright (c) 2010 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. + */ + +#ifndef included_vlib_mc_h +#define included_vlib_mc_h + +#include <vppinfra/elog.h> +#include <vppinfra/fifo.h> +#include <vppinfra/mhash.h> +#include <vlib/node.h> + +#ifndef MC_EVENT_LOGGING +#define MC_EVENT_LOGGING 1 +#endif + +always_inline uword +mc_need_byte_swap (void) +{ + return CLIB_ARCH_IS_LITTLE_ENDIAN; +} + +/* + * Used to uniquely identify hosts. + * For IP4 this would be ip4_address plus tcp/udp port. + */ +typedef union +{ + u8 as_u8[8]; + u64 as_u64; +} mc_peer_id_t; + +always_inline mc_peer_id_t +mc_byte_swap_peer_id (mc_peer_id_t i) +{ + /* Peer id is already in network byte order. */ + return i; +} + +always_inline int +mc_peer_id_compare (mc_peer_id_t a, mc_peer_id_t b) +{ + return memcmp (a.as_u8, b.as_u8, sizeof (a.as_u8)); +} + +/* Assert mastership. Lowest peer_id amount all peers wins mastership. + Only sent/received over mastership channel (MC_TRANSPORT_MASTERSHIP). + So, we don't need a message opcode. */ +typedef CLIB_PACKED (struct + { + /* Peer id asserting mastership. */ + mc_peer_id_t peer_id; + /* Global sequence number asserted. */ + u32 global_sequence;}) mc_msg_master_assert_t; + +always_inline void +mc_byte_swap_msg_master_assert (mc_msg_master_assert_t * r) +{ + if (mc_need_byte_swap ()) + { + r->peer_id = mc_byte_swap_peer_id (r->peer_id); + r->global_sequence = clib_byte_swap_u32 (r->global_sequence); + } +} + +#define foreach_mc_msg_type \ + _ (master_assert) \ + _ (join_or_leave_request) \ + _ (join_reply) \ + _ (user_request) \ + _ (user_ack) \ + _ (catchup_request) \ + _ (catchup_reply) + +typedef enum +{ +#define _(f) MC_MSG_TYPE_##f, + foreach_mc_msg_type +#undef _ +} mc_relay_msg_type_t; + +/* Request to join a given stream. Multicast over MC_TRANSPORT_JOIN. */ +typedef CLIB_PACKED (struct + { +mc_peer_id_t peer_id; mc_relay_msg_type_t type:32; + /* MC_MSG_TYPE_join_or_leave_request */ + /* Stream to join or leave. */ + u32 stream_index; + /* join = 1, leave = 0 */ + u8 is_join;}) mc_msg_join_or_leave_request_t; + +always_inline void +mc_byte_swap_msg_join_or_leave_request (mc_msg_join_or_leave_request_t * r) +{ + if (mc_need_byte_swap ()) + { + r->peer_id = mc_byte_swap_peer_id (r->peer_id); + r->type = clib_byte_swap_u32 (r->type); + r->stream_index = clib_byte_swap_u32 (r->stream_index); + } +} + +/* Join reply. Multicast over MC_TRANSPORT_JOIN. */ +typedef CLIB_PACKED (struct + { +mc_peer_id_t peer_id; mc_relay_msg_type_t type:32; + /* MC_MSG_TYPE_join_reply */ + u32 stream_index; + /* Peer ID to contact to catchup with this stream. */ + mc_peer_id_t catchup_peer_id;}) mc_msg_join_reply_t; + +always_inline void +mc_byte_swap_msg_join_reply (mc_msg_join_reply_t * r) +{ + if (mc_need_byte_swap ()) + { + r->peer_id = mc_byte_swap_peer_id (r->peer_id); + r->type = clib_byte_swap_u32 (r->type); + r->stream_index = clib_byte_swap_u32 (r->stream_index); + r->catchup_peer_id = mc_byte_swap_peer_id (r->catchup_peer_id); + } +} + +/* Generic (application) request. Multicast over MC_TRANSPORT_USER_REQUEST_TO_RELAY and then + relayed by relay master after filling in global sequence number. */ +typedef CLIB_PACKED (struct + { + mc_peer_id_t peer_id; u32 stream_index; + /* Global sequence number as filled in by relay master. */ + u32 global_sequence; + /* Local sequence number as filled in by peer sending message. */ + u32 local_sequence; + /* Size of request data. */ + u32 n_data_bytes; + /* Opaque request data. */ + u8 data[0];}) mc_msg_user_request_t; + +always_inline void +mc_byte_swap_msg_user_request (mc_msg_user_request_t * r) +{ + if (mc_need_byte_swap ()) + { + r->peer_id = mc_byte_swap_peer_id (r->peer_id); + r->stream_index = clib_byte_swap_u32 (r->stream_index); + r->global_sequence = clib_byte_swap_u32 (r->global_sequence); + r->local_sequence = clib_byte_swap_u32 (r->local_sequence); + r->n_data_bytes = clib_byte_swap_u32 (r->n_data_bytes); + } +} + +/* Sent unicast over ACK channel. */ +typedef CLIB_PACKED (struct + { + mc_peer_id_t peer_id; + u32 global_sequence; u32 stream_index; + u32 local_sequence; + i32 seq_cmp_result;}) mc_msg_user_ack_t; + +always_inline void +mc_byte_swap_msg_user_ack (mc_msg_user_ack_t * r) +{ + if (mc_need_byte_swap ()) + { + r->peer_id = mc_byte_swap_peer_id (r->peer_id); + r->stream_index = clib_byte_swap_u32 (r->stream_index); + r->global_sequence = clib_byte_swap_u32 (r->global_sequence); + r->local_sequence = clib_byte_swap_u32 (r->local_sequence); + r->seq_cmp_result = clib_byte_swap_i32 (r->seq_cmp_result); + } +} + +/* Sent/received unicast over catchup channel (e.g. using TCP). */ +typedef CLIB_PACKED (struct + { + mc_peer_id_t peer_id; + u32 stream_index;}) mc_msg_catchup_request_t; + +always_inline void +mc_byte_swap_msg_catchup_request (mc_msg_catchup_request_t * r) +{ + if (mc_need_byte_swap ()) + { + r->peer_id = mc_byte_swap_peer_id (r->peer_id); + r->stream_index = clib_byte_swap_u32 (r->stream_index); + } +} + +/* Sent/received unicast over catchup channel. */ +typedef CLIB_PACKED (struct + { + mc_peer_id_t peer_id; u32 stream_index; + /* Last global sequence number included in catchup data. */ + u32 last_global_sequence_included; + /* Size of catchup data. */ + u32 n_data_bytes; + /* Catchup data. */ + u8 data[0];}) mc_msg_catchup_reply_t; + +always_inline void +mc_byte_swap_msg_catchup_reply (mc_msg_catchup_reply_t * r) +{ + if (mc_need_byte_swap ()) + { + r->peer_id = mc_byte_swap_peer_id (r->peer_id); + r->stream_index = clib_byte_swap_u32 (r->stream_index); + r->last_global_sequence_included = + clib_byte_swap_u32 (r->last_global_sequence_included); + r->n_data_bytes = clib_byte_swap_u32 (r->n_data_bytes); + } +} + +typedef struct _mc_serialize_msg +{ + /* Name for this type. */ + char *name; + + /* Functions to serialize/unserialize data. */ + serialize_function_t *serialize; + serialize_function_t *unserialize; + + /* Maximum message size in bytes when serialized. + If zero then this will be set to the largest sent message. */ + u32 max_n_bytes_serialized; + + /* Opaque to use for first argument to serialize/unserialize function. */ + u32 opaque; + + /* Index in global message vector. */ + u32 global_index; + + /* Registration list */ + struct _mc_serialize_msg *next_registration; +} mc_serialize_msg_t; + +typedef struct +{ + /* Index into global message vector. */ + u32 global_index; +} mc_serialize_stream_msg_t; + +#define MC_SERIALIZE_MSG(x,...) \ + __VA_ARGS__ mc_serialize_msg_t x; \ +static void __mc_serialize_msg_registration_##x (void) \ + __attribute__((__constructor__)) ; \ +static void __mc_serialize_msg_registration_##x (void) \ +{ \ + vlib_main_t * vm = vlib_get_main(); \ + x.next_registration = vm->mc_msg_registrations; \ + vm->mc_msg_registrations = &x; \ +} \ +__VA_ARGS__ mc_serialize_msg_t x + +typedef enum +{ + MC_TRANSPORT_MASTERSHIP, + MC_TRANSPORT_JOIN, + MC_TRANSPORT_USER_REQUEST_TO_RELAY, + MC_TRANSPORT_USER_REQUEST_FROM_RELAY, + MC_N_TRANSPORT_TYPE, +} mc_transport_type_t; + +typedef struct +{ + clib_error_t *(*tx_buffer) (void *opaque, mc_transport_type_t type, + u32 buffer_index); + + clib_error_t *(*tx_ack) (void *opaque, mc_peer_id_t peer_id, + u32 buffer_index); + + /* Returns catchup opaque. */ + uword (*catchup_request_fun) (void *opaque, u32 stream_index, + mc_peer_id_t catchup_peer_id); + + void (*catchup_send_fun) (void *opaque, uword catchup_opaque, + u8 * data_vector); + + /* Opaque passed to callbacks. */ + void *opaque; + + mc_peer_id_t our_ack_peer_id; + mc_peer_id_t our_catchup_peer_id; + + /* Max packet size (MTU) for this transport. + For IP this is interface MTU less IP + UDP header size. */ + u32 max_packet_size; + + format_function_t *format_peer_id; +} mc_transport_t; + +typedef struct +{ + /* Count of messages received from this peer from the past/future + (with seq_cmp != 0). */ + u64 n_msgs_from_past; + u64 n_msgs_from_future; +} mc_stream_peer_stats_t; + +typedef struct +{ + /* ID of this peer. */ + mc_peer_id_t id; + + /* The last sequence we received from this peer. */ + u32 last_sequence_received; + + mc_stream_peer_stats_t stats, stats_last_clear; +} mc_stream_peer_t; + +typedef struct +{ + u32 buffer_index; + + /* Cached copy of local sequence number from buffer. */ + u32 local_sequence; + + /* Number of times this buffer has been sent (retried). */ + u32 n_retries; + + /* Previous/next retries in doubly-linked list. */ + u32 prev_index, next_index; + + /* Bitmap of all peers which have acked this msg */ + uword *unacked_by_peer_bitmap; + + /* Message send or resend time */ + f64 sent_at; +} mc_retry_t; + +typedef struct +{ + /* Number of retries sent for this stream. */ + u64 n_retries; +} mc_stream_stats_t; + +struct mc_main_t; +struct mc_stream_t; + +typedef struct +{ + /* Stream name. */ + char *name; + + /* Number of outstanding messages. */ + u32 window_size; + + /* Retry interval, in seconds */ + f64 retry_interval; + + /* Retry limit */ + u32 retry_limit; + + /* User rx buffer callback */ + void (*rx_buffer) (struct mc_main_t * mc_main, + struct mc_stream_t * stream, + mc_peer_id_t peer_id, u32 buffer_index); + + /* User callback to create a snapshot */ + u8 *(*catchup_snapshot) (struct mc_main_t * mc_main, + u8 * snapshot_vector, + u32 last_global_sequence_included); + + /* User callback to replay a snapshot */ + void (*catchup) (struct mc_main_t * mc_main, + u8 * snapshot_data, u32 n_snapshot_data_bytes); + + /* Callback to save a snapshot for offline replay */ + void (*save_snapshot) (struct mc_main_t * mc_main, + u32 is_catchup, + u8 * snapshot_data, u32 n_snapshot_data_bytes); + + /* Called when a peer dies */ + void (*peer_died) (struct mc_main_t * mc_main, + struct mc_stream_t * stream, mc_peer_id_t peer_id); +} mc_stream_config_t; + +#define foreach_mc_stream_state \ + _ (invalid) \ + _ (name_known) \ + _ (join_in_progress) \ + _ (catchup) \ + _ (ready) + +typedef enum +{ +#define _(f) MC_STREAM_STATE_##f, + foreach_mc_stream_state +#undef _ +} mc_stream_state_t; + +typedef struct mc_stream_t +{ + mc_stream_config_t config; + + mc_stream_state_t state; + + /* Index in stream pool. */ + u32 index; + + /* Stream index 0 is always for MC internal use. */ +#define MC_STREAM_INDEX_INTERNAL 0 + + mc_retry_t *retry_pool; + + /* Head and tail index of retry pool. */ + u32 retry_head_index, retry_tail_index; + + /* + * Country club for recently retired messages + * If the set of peers is expanding and a new peer + * misses a message, we can easily retire the FIFO + * element before we even know about the new peer + */ + mc_retry_t *retired_fifo; + + /* Hash mapping local sequence to retry pool index. */ + uword *retry_index_by_local_sequence; + + /* catch-up fifo of VLIB buffer indices. + start recording when catching up. */ + u32 *catchup_fifo; + + mc_stream_stats_t stats, stats_last_clear; + + /* Peer pool. */ + mc_stream_peer_t *peers; + + /* Bitmap with ones for all peers in peer pool. */ + uword *all_peer_bitmap; + + /* Map of 64 bit id to index in stream pool. */ + mhash_t peer_index_by_id; + + /* Timeout, in case we're alone in the world */ + f64 join_timeout; + + vlib_one_time_waiting_process_t *procs_waiting_for_join_done; + + vlib_one_time_waiting_process_t *procs_waiting_for_open_window; + + /* Next sequence number to use */ + u32 our_local_sequence; + + /* + * Last global sequence we processed. + * When supplying catchup data, we need to tell + * the client precisely where to start replaying + */ + u32 last_global_sequence_processed; + + /* Vector of unique messages we've sent on this stream. */ + mc_serialize_stream_msg_t *stream_msgs; + + /* Vector global message index into per stream message index. */ + u32 *stream_msg_index_by_global_index; + + /* Hashed by message name. */ + uword *stream_msg_index_by_name; + + u64 user_requests_sent; + u64 user_requests_received; +} mc_stream_t; + +always_inline void +mc_stream_free (mc_stream_t * s) +{ + pool_free (s->retry_pool); + hash_free (s->retry_index_by_local_sequence); + clib_fifo_free (s->catchup_fifo); + pool_free (s->peers); + mhash_free (&s->peer_index_by_id); + vec_free (s->procs_waiting_for_join_done); + vec_free (s->procs_waiting_for_open_window); +} + +always_inline void +mc_stream_init (mc_stream_t * s) +{ + memset (s, 0, sizeof (s[0])); + s->retry_head_index = s->retry_tail_index = ~0; +} + +typedef struct +{ + u32 stream_index; + u32 catchup_opaque; + u8 *catchup_snapshot; +} mc_catchup_process_arg_t; + +typedef enum +{ + MC_RELAY_STATE_NEGOTIATE, + MC_RELAY_STATE_MASTER, + MC_RELAY_STATE_SLAVE, +} mc_relay_state_t; + +typedef struct +{ + mc_peer_id_t peer_id; + + f64 time_last_master_assert_received; +} mc_mastership_peer_t; + +typedef struct +{ + u32 stream_index; + u32 buffer_index; +} mc_stream_and_buffer_t; + +typedef struct mc_main_t +{ + mc_relay_state_t relay_state; + + /* Mastership */ + u32 we_can_be_relay_master; + + u64 relay_master_peer_id; + + mc_mastership_peer_t *mastership_peers; + + /* Map of 64 bit id to index in stream pool. */ + mhash_t mastership_peer_index_by_id; + + /* The transport we're using. */ + mc_transport_t transport; + + /* Last-used global sequence number. */ + u32 relay_global_sequence; + + /* Vector of streams. */ + mc_stream_t *stream_vector; + + /* Hash table mapping stream name to pool index. */ + uword *stream_index_by_name; + + uword *procs_waiting_for_stream_name_by_name; + + vlib_one_time_waiting_process_t **procs_waiting_for_stream_name_pool; + + int joins_in_progress; + + mc_catchup_process_arg_t *catchup_process_args; + + /* Node indices for mastership, join ager, + retry and catchup processes. */ + u32 mastership_process; + u32 join_ager_process; + u32 retry_process; + u32 catchup_process; + u32 unserialize_process; + + /* Global vector of messages. */ + mc_serialize_msg_t **global_msgs; + + /* Hash table mapping message name to index. */ + uword *global_msg_index_by_name; + + /* Shared serialize/unserialize main. */ + serialize_main_t serialize_mains[VLIB_N_RX_TX]; + + vlib_serialize_buffer_main_t serialize_buffer_mains[VLIB_N_RX_TX]; + + /* Convenience variables */ + struct vlib_main_t *vlib_main; + elog_main_t *elog_main; + + /* Maps 64 bit peer id to elog string table offset for this formatted peer id. */ + mhash_t elog_id_by_peer_id; + + uword *elog_id_by_msg_name; + + /* For mc_unserialize. */ + mc_stream_and_buffer_t *mc_unserialize_stream_and_buffers; +} mc_main_t; + +always_inline mc_stream_t * +mc_stream_by_name (mc_main_t * m, char *name) +{ + uword *p = hash_get (m->stream_index_by_name, name); + return p ? vec_elt_at_index (m->stream_vector, p[0]) : 0; +} + +always_inline mc_stream_t * +mc_stream_by_index (mc_main_t * m, u32 i) +{ + return i < vec_len (m->stream_vector) ? m->stream_vector + i : 0; +} + +always_inline void +mc_clear_stream_stats (mc_main_t * m) +{ + mc_stream_t *s; + mc_stream_peer_t *p; + vec_foreach (s, m->stream_vector) + { + s->stats_last_clear = s->stats; + /* *INDENT-OFF* */ + pool_foreach (p, s->peers, ({ + p->stats_last_clear = p->stats; + })); + /* *INDENT-ON* */ + } +} + +/* Declare all message handlers. */ +#define _(f) void mc_msg_##f##_handler (mc_main_t * mcm, mc_msg_##f##_t * msg, u32 buffer_index); +foreach_mc_msg_type +#undef _ + u32 mc_stream_join (mc_main_t * mcm, mc_stream_config_t *); + +void mc_stream_leave (mc_main_t * mcm, u32 stream_index); + +void mc_wait_for_stream_ready (mc_main_t * m, char *stream_name); + +u32 mc_stream_send (mc_main_t * mcm, u32 stream_index, u32 buffer_index); + +void mc_main_init (mc_main_t * mcm, char *tag); + +void mc_enable_disable_mastership (mc_main_t * mcm, int we_can_be_master); + +void *mc_get_vlib_buffer (struct vlib_main_t *vm, u32 n_bytes, + u32 * bi_return); + +format_function_t format_mc_main; + +clib_error_t *mc_serialize_internal (mc_main_t * mc, + u32 stream_index, + u32 multiple_messages_per_vlib_buffer, + mc_serialize_msg_t * msg, ...); + +clib_error_t *mc_serialize_va (mc_main_t * mc, + u32 stream_index, + u32 multiple_messages_per_vlib_buffer, + mc_serialize_msg_t * msg, va_list * va); + +#define mc_serialize_stream(mc,si,msg,args...) \ + mc_serialize_internal((mc),(si),(0),(msg),(msg)->serialize,args) + +#define mc_serialize(mc,msg,args...) \ + mc_serialize_internal((mc),(~0),(0),(msg),(msg)->serialize,args) + +#define mc_serialize2(mc,add,msg,args...) \ + mc_serialize_internal((mc),(~0),(add),(msg),(msg)->serialize,args) + +void mc_unserialize (mc_main_t * mcm, mc_stream_t * s, u32 buffer_index); +uword mc_unserialize_message (mc_main_t * mcm, mc_stream_t * s, + serialize_main_t * m); + +serialize_function_t serialize_mc_main, unserialize_mc_main; + +always_inline uword +mc_max_message_size_in_bytes (mc_main_t * mcm) +{ + return mcm->transport.max_packet_size - sizeof (mc_msg_user_request_t); +} + +always_inline word +mc_serialize_n_bytes_left (mc_main_t * mcm, serialize_main_t * m) +{ + return mc_max_message_size_in_bytes (mcm) - + serialize_vlib_buffer_n_bytes (m); +} + +void unserialize_mc_stream (serialize_main_t * m, va_list * va); +void mc_stream_join_process_hold (void); + +#endif /* included_vlib_mc_h */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |