diff options
Diffstat (limited to 'net/tipc/link.h')
| -rw-r--r-- | net/tipc/link.h | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/net/tipc/link.h b/net/tipc/link.h new file mode 100644 index 000000000..b5b4e3554 --- /dev/null +++ b/net/tipc/link.h @@ -0,0 +1,311 @@ +/* + * net/tipc/link.h: Include file for TIPC link code + * + * Copyright (c) 1995-2006, 2013-2014, Ericsson AB + * Copyright (c) 2004-2005, 2010-2011, Wind River Systems + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the names of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _TIPC_LINK_H +#define _TIPC_LINK_H + +#include <net/genetlink.h> +#include "msg.h" +#include "node.h" + +/* TIPC-specific error codes +*/ +#define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */ + +/* Out-of-range value for link sequence numbers + */ +#define INVALID_LINK_SEQ 0x10000 + +/* Link working states + */ +#define WORKING_WORKING 560810u +#define WORKING_UNKNOWN 560811u +#define RESET_UNKNOWN 560812u +#define RESET_RESET 560813u + +/* Link endpoint execution states + */ +#define LINK_STARTED 0x0001 +#define LINK_STOPPED 0x0002 +#define LINK_SYNCHING 0x0004 +#define LINK_FAILINGOVER 0x0008 + +/* Starting value for maximum packet size negotiation on unicast links + * (unless bearer MTU is less) + */ +#define MAX_PKT_DEFAULT 1500 + +struct tipc_stats { + u32 sent_info; /* used in counting # sent packets */ + u32 recv_info; /* used in counting # recv'd packets */ + u32 sent_states; + u32 recv_states; + u32 sent_probes; + u32 recv_probes; + u32 sent_nacks; + u32 recv_nacks; + u32 sent_acks; + u32 sent_bundled; + u32 sent_bundles; + u32 recv_bundled; + u32 recv_bundles; + u32 retransmitted; + u32 sent_fragmented; + u32 sent_fragments; + u32 recv_fragmented; + u32 recv_fragments; + u32 link_congs; /* # port sends blocked by congestion */ + u32 deferred_recv; + u32 duplicates; + u32 max_queue_sz; /* send queue size high water mark */ + u32 accu_queue_sz; /* used for send queue size profiling */ + u32 queue_sz_counts; /* used for send queue size profiling */ + u32 msg_length_counts; /* used for message length profiling */ + u32 msg_lengths_total; /* used for message length profiling */ + u32 msg_length_profile[7]; /* used for msg. length profiling */ +}; + +/** + * struct tipc_link - TIPC link data structure + * @addr: network address of link's peer node + * @name: link name character string + * @media_addr: media address to use when sending messages over link + * @timer: link timer + * @owner: pointer to peer node + * @refcnt: reference counter for permanent references (owner node & timer) + * @flags: execution state flags for link endpoint instance + * @checkpoint: reference point for triggering link continuity checking + * @peer_session: link session # being used by peer end of link + * @peer_bearer_id: bearer id used by link's peer endpoint + * @bearer_id: local bearer id used by link + * @tolerance: minimum link continuity loss needed to reset link [in ms] + * @cont_intv: link continuity testing interval + * @abort_limit: # of unacknowledged continuity probes needed to reset link + * @state: current state of link FSM + * @fsm_msg_cnt: # of protocol messages link FSM has sent in current state + * @proto_msg: template for control messages generated by link + * @pmsg: convenience pointer to "proto_msg" field + * @priority: current link priority + * @net_plane: current link network plane ('A' through 'H') + * @backlog_limit: backlog queue congestion thresholds (indexed by importance) + * @exp_msg_count: # of tunnelled messages expected during link changeover + * @reset_checkpoint: seq # of last acknowledged message at time of link reset + * @mtu: current maximum packet size for this link + * @advertised_mtu: advertised own mtu when link is being established + * @transmitq: queue for sent, non-acked messages + * @backlogq: queue for messages waiting to be sent + * @next_out_no: next sequence number to use for outbound messages + * @last_retransmitted: sequence number of most recently retransmitted message + * @stale_count: # of identical retransmit requests made by peer + * @next_in_no: next sequence number to expect for inbound messages + * @deferred_queue: deferred queue saved OOS b'cast message received from node + * @unacked_window: # of inbound messages rx'd without ack'ing back to peer + * @inputq: buffer queue for messages to be delivered upwards + * @namedq: buffer queue for name table messages to be delivered upwards + * @next_out: ptr to first unsent outbound message in queue + * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate + * @long_msg_seq_no: next identifier to use for outbound fragmented messages + * @reasm_buf: head of partially reassembled inbound message fragments + * @stats: collects statistics regarding link activity + */ +struct tipc_link { + u32 addr; + char name[TIPC_MAX_LINK_NAME]; + struct tipc_media_addr media_addr; + struct timer_list timer; + struct tipc_node *owner; + struct kref ref; + + /* Management and link supervision data */ + unsigned int flags; + u32 checkpoint; + u32 peer_session; + u32 peer_bearer_id; + u32 bearer_id; + u32 tolerance; + unsigned long cont_intv; + u32 abort_limit; + int state; + u32 fsm_msg_cnt; + struct { + unchar hdr[INT_H_SIZE]; + unchar body[TIPC_MAX_IF_NAME]; + } proto_msg; + struct tipc_msg *pmsg; + u32 priority; + char net_plane; + u16 synch_point; + + /* Failover */ + u16 failover_pkts; + u16 failover_checkpt; + struct sk_buff *failover_skb; + + /* Max packet negotiation */ + u16 mtu; + u16 advertised_mtu; + + /* Sending */ + struct sk_buff_head transmq; + struct sk_buff_head backlogq; + struct { + u16 len; + u16 limit; + } backlog[5]; + u32 next_out_no; + u32 window; + u32 last_retransmitted; + u32 stale_count; + + /* Reception */ + u32 next_in_no; + u32 rcv_unacked; + struct sk_buff_head deferdq; + struct sk_buff_head inputq; + struct sk_buff_head namedq; + + /* Congestion handling */ + struct sk_buff_head wakeupq; + + /* Fragmentation/reassembly */ + struct sk_buff *reasm_buf; + + /* Statistics */ + struct tipc_stats stats; +}; + +struct tipc_port; + +struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, + struct tipc_bearer *b_ptr, + const struct tipc_media_addr *media_addr); +void tipc_link_delete(struct tipc_link *link); +void tipc_link_delete_list(struct net *net, unsigned int bearer_id, + bool shutting_down); +void tipc_link_failover_send_queue(struct tipc_link *l_ptr); +void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, struct tipc_link *dest); +void tipc_link_reset_fragments(struct tipc_link *l_ptr); +int tipc_link_is_up(struct tipc_link *l_ptr); +int tipc_link_is_active(struct tipc_link *l_ptr); +void tipc_link_purge_queues(struct tipc_link *l_ptr); +void tipc_link_reset_all(struct tipc_node *node); +void tipc_link_reset(struct tipc_link *l_ptr); +void tipc_link_reset_list(struct net *net, unsigned int bearer_id); +int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dest, + u32 selector); +int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dest, + u32 selector); +int __tipc_link_xmit(struct net *net, struct tipc_link *link, + struct sk_buff_head *list); +void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int prob, + u32 gap, u32 tolerance, u32 priority); +void tipc_link_push_packets(struct tipc_link *l_ptr); +u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *buf); +void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window); +void tipc_link_retransmit(struct tipc_link *l_ptr, + struct sk_buff *start, u32 retransmits); +struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list, + const struct sk_buff *skb); + +int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb); +int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info); +int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info); +int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info); +int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]); +void link_prepare_wakeup(struct tipc_link *l); + +/* + * Link sequence number manipulation routines (uses modulo 2**16 arithmetic) + */ +static inline u32 buf_seqno(struct sk_buff *buf) +{ + return msg_seqno(buf_msg(buf)); +} + +static inline u32 mod(u32 x) +{ + return x & 0xffffu; +} + +static inline int less_eq(u32 left, u32 right) +{ + return mod(right - left) < 32768u; +} + +static inline int more(u32 left, u32 right) +{ + return !less_eq(left, right); +} + +static inline int less(u32 left, u32 right) +{ + return less_eq(left, right) && (mod(right) != mod(left)); +} + +static inline u32 lesser(u32 left, u32 right) +{ + return less_eq(left, right) ? left : right; +} + +static inline u32 link_own_addr(struct tipc_link *l) +{ + return msg_prevnode(l->pmsg); +} + +/* + * Link status checking routines + */ +static inline int link_working_working(struct tipc_link *l_ptr) +{ + return l_ptr->state == WORKING_WORKING; +} + +static inline int link_working_unknown(struct tipc_link *l_ptr) +{ + return l_ptr->state == WORKING_UNKNOWN; +} + +static inline int link_reset_unknown(struct tipc_link *l_ptr) +{ + return l_ptr->state == RESET_UNKNOWN; +} + +static inline int link_reset_reset(struct tipc_link *l_ptr) +{ + return l_ptr->state == RESET_RESET; +} + +#endif |