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https://github.com/openvswitch/ovs
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cf62fa4c70
Currently dp-packet make use of ofpbuf for managing packet buffers. That complicates ofpbuf, by making dp-packet independent of ofpbuf both libraries can be optimized for their own use case. This avoids mapping operation between ofpbuf and dp_packet in datapath upcalls. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Jarno Rajahalme <jrajahalme@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
163 lines
6.3 KiB
C
163 lines
6.3 KiB
C
/*
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* Copyright (c) 2008, 2011 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef STP_H
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#define STP_H 1
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/* This is an implementation of Spanning Tree Protocol as described in IEEE
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* 802.1D-1998, clauses 8 and 9. Section numbers refer to this standard. */
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#include <stdbool.h>
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#include <stdint.h>
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#include "compiler.h"
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#include "util.h"
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struct dp_packet;
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/* Bridge and port priorities that should be used by default. */
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#define STP_DEFAULT_BRIDGE_PRIORITY 32768
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#define STP_DEFAULT_PORT_PRIORITY 128
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/* Default time values. */
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#define STP_DEFAULT_MAX_AGE 20000
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#define STP_DEFAULT_HELLO_TIME 2000
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#define STP_DEFAULT_FWD_DELAY 15000
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/* Bridge identifier. Top 16 bits are a priority value (numerically lower
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* values are higher priorities). Bottom 48 bits are MAC address of bridge. */
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typedef uint64_t stp_identifier;
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#define STP_ID_FMT "%04"PRIx16".%012"PRIx64
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#define STP_ID_ARGS(stp_id) \
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(uint16_t)((stp_id) >> 48), \
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(uint64_t)((stp_id) & 0xffffffffffffULL)
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#define STP_PORT_ID_FMT "%04"PRIx16
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/* Basic STP functionality. */
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#define STP_MAX_PORTS 255
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void stp_init(void);
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struct stp *stp_create(const char *name, stp_identifier bridge_id,
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void (*send_bpdu)(struct dp_packet *bpdu, int port_no,
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void *aux),
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void *aux);
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struct stp *stp_ref(const struct stp *);
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void stp_unref(struct stp *);
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void stp_tick(struct stp *, int ms);
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void stp_set_bridge_id(struct stp *, stp_identifier bridge_id);
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void stp_set_bridge_priority(struct stp *, uint16_t new_priority);
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void stp_set_hello_time(struct stp *, int ms);
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void stp_set_max_age(struct stp *, int ms);
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void stp_set_forward_delay(struct stp *, int ms);
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/* STP properties. */
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const char *stp_get_name(const struct stp *);
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stp_identifier stp_get_bridge_id(const struct stp *);
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stp_identifier stp_get_designated_root(const struct stp *);
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bool stp_is_root_bridge(const struct stp *);
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int stp_get_root_path_cost(const struct stp *);
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int stp_get_hello_time(const struct stp *);
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int stp_get_max_age(const struct stp *);
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int stp_get_forward_delay(const struct stp *);
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bool stp_check_and_reset_fdb_flush(struct stp *);
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/* Obtaining STP ports. */
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struct stp_port *stp_get_port(struct stp *, int port_no);
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struct stp_port *stp_get_root_port(struct stp *);
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bool stp_get_changed_port(struct stp *, struct stp_port **portp);
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/* State of an STP port.
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*
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* A port is in exactly one state at any given time, but distinct bits are used
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* for states to allow testing for more than one state with a bit mask.
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*
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* The STP_DISABLED state means that the port is disabled by management.
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* In our implementation, this state means that the port does not
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* participate in the spanning tree, but it still forwards traffic as if
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* it were in the STP_FORWARDING state. This may be different from
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* other implementations.
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*
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* The following diagram describes the various states and what they are
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* allowed to do in OVS:
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*
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* FWD LRN TX_BPDU RX_BPDU FWD_BPDU
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* --- --- ------- ------- --------
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* Disabled Y - - - Y
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* Blocking - - - Y -
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* Listening - - Y Y Y
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* Learning - Y Y Y Y
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* Forwarding Y Y Y Y Y
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*
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*
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* FWD: the port should forward any incoming non-stp-BPDU
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* packets.
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*
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* LRN: the port should conduct MAC learning on packets received.
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*
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* TX_BPDU/RX_BPDU: the port could generate/consume bpdus.
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*
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* FWD_BPDU: the port should should always forward the BPDUS,
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* whether they are generated by the port or received
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* as incoming packets.
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*
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* Once again, note that the disabled state forwards traffic, which is
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* likely different than the spec would indicate.
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*/
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enum stp_state {
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STP_DISABLED = 1 << 0, /* 8.4.5: See note above. */
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STP_LISTENING = 1 << 1, /* 8.4.2: Not learning or relaying frames. */
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STP_LEARNING = 1 << 2, /* 8.4.3: Learning but not relaying frames. */
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STP_FORWARDING = 1 << 3, /* 8.4.4: Learning and relaying frames. */
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STP_BLOCKING = 1 << 4 /* 8.4.1: Initial boot state. */
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};
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const char *stp_state_name(enum stp_state);
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bool stp_forward_in_state(enum stp_state);
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bool stp_learn_in_state(enum stp_state);
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bool stp_should_forward_bpdu(enum stp_state);
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/* Role of an STP port. */
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enum stp_role {
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STP_ROLE_ROOT, /* Path to root bridge. */
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STP_ROLE_DESIGNATED, /* Path to LAN segments. */
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STP_ROLE_ALTERNATE, /* Backup path to root bridge. */
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STP_ROLE_DISABLED /* Port does not participate in STP. */
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};
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const char *stp_role_name(enum stp_role);
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void stp_received_bpdu(struct stp_port *, const void *bpdu, size_t bpdu_size);
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struct stp *stp_port_get_stp(struct stp_port *);
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void stp_port_set_name(struct stp_port *, const char *);
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void stp_port_set_aux(struct stp_port *, void *);
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void *stp_port_get_aux(struct stp_port *);
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int stp_port_no(const struct stp_port *);
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int stp_port_get_id(const struct stp_port *);
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enum stp_state stp_port_get_state(const struct stp_port *);
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enum stp_role stp_port_get_role(const struct stp_port *);
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void stp_port_get_counts(const struct stp_port *,
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int *tx_count, int *rx_count, int *error_count);
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void stp_port_enable(struct stp_port *);
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void stp_port_disable(struct stp_port *);
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void stp_port_set_priority(struct stp_port *, uint8_t new_priority);
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uint16_t stp_convert_speed_to_cost(unsigned int speed);
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void stp_port_set_path_cost(struct stp_port *, uint16_t path_cost);
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void stp_port_set_speed(struct stp_port *, unsigned int speed);
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void stp_port_enable_change_detection(struct stp_port *);
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void stp_port_disable_change_detection(struct stp_port *);
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#endif /* stp.h */
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