--- /dev/null
+/*
+ * net/tipc/link.h: Include file for TIPC link code
+ *
+ * Copyright (c) 1995-2006, Ericsson AB
+ * Copyright (c) 2004-2005, 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 "dbg.h"
+#include "msg.h"
+#include "bearer.h"
+#include "node.h"
+
+#define PUSH_FAILED 1
+#define PUSH_FINISHED 2
+
+/*
+ * Link states
+ */
+
+#define WORKING_WORKING 560810u
+#define WORKING_UNKNOWN 560811u
+#define RESET_UNKNOWN 560812u
+#define RESET_RESET 560813u
+
+/*
+ * Starting value for maximum packet size negotiation on unicast links
+ * (unless bearer MTU is less)
+ */
+
+#define MAX_PKT_DEFAULT 1500
+
+/**
+ * struct 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
+ * @link_list: adjacent links in bearer's list of links
+ * @started: indicates if link has been started
+ * @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
+ * @b_ptr: pointer to bearer used by link
+ * @tolerance: minimum link continuity loss needed to reset link [in ms]
+ * @continuity_interval: link continuity testing interval [in ms]
+ * @abort_limit: # of unacknowledged continuity probes needed to reset link
+ * @state: current state of link FSM
+ * @blocked: indicates if link has been administratively blocked
+ * @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
+ * @queue_limit: outbound message queue congestion thresholds (indexed by user)
+ * @exp_msg_count: # of tunnelled messages expected during link changeover
+ * @reset_checkpoint: seq # of last acknowledged message at time of link reset
+ * @max_pkt: current maximum packet size for this link
+ * @max_pkt_target: desired maximum packet size for this link
+ * @max_pkt_probes: # of probes based on current (max_pkt, max_pkt_target)
+ * @out_queue_size: # of messages in outbound message queue
+ * @first_out: ptr to first outbound message in queue
+ * @last_out: ptr to last outbound message in queue
+ * @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_inqueue_sz: # of messages in inbound message queue
+ * @oldest_deferred_in: ptr to first inbound message in queue
+ * @newest_deferred_in: ptr to last inbound message in queue
+ * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
+ * @proto_msg_queue: ptr to (single) outbound control message
+ * @retransm_queue_size: number of messages to retransmit
+ * @retransm_queue_head: sequence number of first message to retransmit
+ * @next_out: ptr to first unsent outbound message in queue
+ * @waiting_ports: linked list of ports waiting for link congestion to abate
+ * @long_msg_seq_no: next identifier to use for outbound fragmented messages
+ * @defragm_buf: list of partially reassembled inbound message fragments
+ * @stats: collects statistics regarding link activity
+ * @print_buf: print buffer used to log link activity
+ */
+
+struct link {
+ u32 addr;
+ char name[TIPC_MAX_LINK_NAME];
+ struct tipc_media_addr media_addr;
+ struct timer_list timer;
+ struct node *owner;
+ struct list_head link_list;
+
+ /* Management and link supervision data */
+ int started;
+ u32 checkpoint;
+ u32 peer_session;
+ u32 peer_bearer_id;
+ struct bearer *b_ptr;
+ u32 tolerance;
+ u32 continuity_interval;
+ u32 abort_limit;
+ int state;
+ int blocked;
+ u32 fsm_msg_cnt;
+ struct {
+ unchar hdr[INT_H_SIZE];
+ unchar body[TIPC_MAX_IF_NAME];
+ } proto_msg;
+ struct tipc_msg *pmsg;
+ u32 priority;
+ u32 queue_limit[15]; /* queue_limit[0]==window limit */
+
+ /* Changeover */
+ u32 exp_msg_count;
+ u32 reset_checkpoint;
+
+ /* Max packet negotiation */
+ u32 max_pkt;
+ u32 max_pkt_target;
+ u32 max_pkt_probes;
+
+ /* Sending */
+ u32 out_queue_size;
+ struct sk_buff *first_out;
+ struct sk_buff *last_out;
+ u32 next_out_no;
+ u32 last_retransmitted;
+ u32 stale_count;
+
+ /* Reception */
+ u32 next_in_no;
+ u32 deferred_inqueue_sz;
+ struct sk_buff *oldest_deferred_in;
+ struct sk_buff *newest_deferred_in;
+ u32 unacked_window;
+
+ /* Congestion handling */
+ struct sk_buff *proto_msg_queue;
+ u32 retransm_queue_size;
+ u32 retransm_queue_head;
+ struct sk_buff *next_out;
+ struct list_head waiting_ports;
+
+ /* Fragmentation/defragmentation */
+ u32 long_msg_seq_no;
+ struct sk_buff *defragm_buf;
+
+ /* Statistics */
+ struct {
+ 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 bearer_congs;
+ u32 deferred_recv;
+ u32 duplicates;
+
+ /* for statistical profiling of send queue size */
+
+ u32 max_queue_sz;
+ u32 accu_queue_sz;
+ u32 queue_sz_counts;
+
+ /* for statistical profiling of message lengths */
+
+ u32 msg_length_counts;
+ u32 msg_lengths_total;
+ u32 msg_length_profile[7];
+#if 0
+ u32 sent_tunneled;
+ u32 recv_tunneled;
+#endif
+ } stats;
+
+ struct print_buf print_buf;
+};
+
+struct port;
+
+struct link *tipc_link_create(struct bearer *b_ptr, const u32 peer,
+ const struct tipc_media_addr *media_addr);
+void tipc_link_delete(struct link *l_ptr);
+void tipc_link_changeover(struct link *l_ptr);
+void tipc_link_send_duplicate(struct link *l_ptr, struct link *dest);
+void tipc_link_reset_fragments(struct link *l_ptr);
+int tipc_link_is_up(struct link *l_ptr);
+int tipc_link_is_active(struct link *l_ptr);
+void tipc_link_start(struct link *l_ptr);
+u32 tipc_link_push_packet(struct link *l_ptr);
+void tipc_link_stop(struct link *l_ptr);
+struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space, u16 cmd);
+struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space);
+struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space);
+void tipc_link_reset(struct link *l_ptr);
+int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector);
+int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf);
+u32 tipc_link_get_max_pkt(u32 dest,u32 selector);
+int tipc_link_send_sections_fast(struct port* sender,
+ struct iovec const *msg_sect,
+ const u32 num_sect,
+ u32 destnode);
+int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf);
+void tipc_link_tunnel(struct link *l_ptr, struct tipc_msg *tnl_hdr,
+ struct tipc_msg *msg, u32 selector);
+void tipc_link_recv_bundle(struct sk_buff *buf);
+int tipc_link_recv_fragment(struct sk_buff **pending,
+ struct sk_buff **fb,
+ struct tipc_msg **msg);
+void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int prob, u32 gap,
+ u32 tolerance, u32 priority, u32 acked_mtu);
+void tipc_link_push_queue(struct link *l_ptr);
+u32 tipc_link_defer_pkt(struct sk_buff **head, struct sk_buff **tail,
+ struct sk_buff *buf);
+void tipc_link_wakeup_ports(struct link *l_ptr, int all);
+void tipc_link_set_queue_limits(struct link *l_ptr, u32 window);
+void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *start, u32 retransmits);
+
+/*
+ * Link sequence number manipulation routines (uses modulo 2**16 arithmetic)
+ */
+
+static inline u32 mod(u32 x)
+{
+ return x & 0xffffu;
+}
+
+static inline int between(u32 lower, u32 upper, u32 n)
+{
+ if ((lower < n) && (n < upper))
+ return 1;
+ if ((upper < lower) && ((n > lower) || (n < upper)))
+ return 1;
+ return 0;
+}
+
+static inline int less_eq(u32 left, u32 right)
+{
+ return (mod(right - left) < 32768u);
+}
+
+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;
+}
+
+#endif
git://git.onelab.eu / linux-2.6.git / blobdiff