[TIPC] Initial merge

TIPC (Transparent Inter Process Communication) is a protocol designed for
intra cluster communication. For more information see
http://tipc.sourceforge.net

Signed-off-by: Per Liden <per.liden@nospam.ericsson.com>

1 files changed, 573 insertions, 0 deletions

diff --git a/net/tipc/cluster.c b/net/tipc/cluster.c
new file mode 100644
index 00000000000..d7d0f5f17e0
--- /dev/null
+++ b/net/tipc/cluster.c
@@ -0,0 +1,573 @@
+/*
+ * net/tipc/cluster.c: TIPC cluster management routines
+ * 
+ * Copyright (c) 2003-2005, Ericsson Research Canada
+ * Copyright (c) 2005, Wind River Systems
+ * Copyright (c) 2005-2006, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * 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.
+ * 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.
+ *
+ * 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.
+ */
+
+#include "core.h"
+#include "cluster.h"
+#include "addr.h"
+#include "node_subscr.h"
+#include "link.h"
+#include "node.h"
+#include "net.h"
+#include "msg.h"
+#include "bearer.h"
+
+void cluster_multicast(struct cluster *c_ptr, struct sk_buff *buf, 
+		       u32 lower, u32 upper);
+struct sk_buff *cluster_prepare_routing_msg(u32 data_size, u32 dest);
+
+struct node **local_nodes = 0;
+struct node_map cluster_bcast_nodes = {0,{0,}};
+u32 highest_allowed_slave = 0;
+
+struct cluster *cluster_create(u32 addr)
+{
+	struct _zone *z_ptr;
+	struct cluster *c_ptr;
+	int max_nodes; 
+	int alloc;
+
+	c_ptr = (struct cluster *)kmalloc(sizeof(*c_ptr), GFP_ATOMIC);
+	if (c_ptr == NULL)
+		return 0;
+	memset(c_ptr, 0, sizeof(*c_ptr));
+
+	c_ptr->addr = tipc_addr(tipc_zone(addr), tipc_cluster(addr), 0);
+	if (in_own_cluster(addr))
+		max_nodes = LOWEST_SLAVE + tipc_max_slaves;
+	else
+		max_nodes = tipc_max_nodes + 1;
+	alloc = sizeof(void *) * (max_nodes + 1);
+	c_ptr->nodes = (struct node **)kmalloc(alloc, GFP_ATOMIC);
+	if (c_ptr->nodes == NULL) {
+		kfree(c_ptr);
+		return 0;
+	}
+	memset(c_ptr->nodes, 0, alloc);  
+	if (in_own_cluster(addr))
+		local_nodes = c_ptr->nodes;
+	c_ptr->highest_slave = LOWEST_SLAVE - 1;
+	c_ptr->highest_node = 0;
+	
+	z_ptr = zone_find(tipc_zone(addr));
+	if (z_ptr == NULL) {
+		z_ptr = zone_create(addr);
+	}
+	if (z_ptr != NULL) {
+		zone_attach_cluster(z_ptr, c_ptr);
+		c_ptr->owner = z_ptr;
+	}
+	else {
+		kfree(c_ptr);
+		c_ptr = 0;
+	}
+
+	return c_ptr;
+}
+
+void cluster_delete(struct cluster *c_ptr)
+{
+	u32 n_num;
+
+	if (!c_ptr)
+		return;
+	for (n_num = 1; n_num <= c_ptr->highest_node; n_num++) {
+		node_delete(c_ptr->nodes[n_num]);
+	}
+	for (n_num = LOWEST_SLAVE; n_num <= c_ptr->highest_slave; n_num++) {
+		node_delete(c_ptr->nodes[n_num]);
+	}
+	kfree(c_ptr->nodes);
+	kfree(c_ptr);
+}
+
+u32 cluster_next_node(struct cluster *c_ptr, u32 addr)
+{
+	struct node *n_ptr;
+	u32 n_num = tipc_node(addr) + 1;
+
+	if (!c_ptr)
+		return addr;
+	for (; n_num <= c_ptr->highest_node; n_num++) {
+		n_ptr = c_ptr->nodes[n_num];
+		if (n_ptr && node_has_active_links(n_ptr))
+			return n_ptr->addr;
+	}
+	for (n_num = 1; n_num < tipc_node(addr); n_num++) {
+		n_ptr = c_ptr->nodes[n_num];
+		if (n_ptr && node_has_active_links(n_ptr))
+			return n_ptr->addr;
+	}
+	return 0;
+}
+
+void cluster_attach_node(struct cluster *c_ptr, struct node *n_ptr)
+{
+	u32 n_num = tipc_node(n_ptr->addr);
+	u32 max_n_num = tipc_max_nodes;
+
+	if (in_own_cluster(n_ptr->addr))
+		max_n_num = highest_allowed_slave;
+	assert(n_num > 0);
+	assert(n_num <= max_n_num);
+	assert(c_ptr->nodes[n_num] == 0);
+	c_ptr->nodes[n_num] = n_ptr;
+	if (n_num > c_ptr->highest_node)
+		c_ptr->highest_node = n_num;
+}
+
+/**
+ * cluster_select_router - select router to a cluster
+ * 
+ * Uses deterministic and fair algorithm.
+ */
+
+u32 cluster_select_router(struct cluster *c_ptr, u32 ref)
+{
+	u32 n_num;
+	u32 ulim = c_ptr->highest_node;
+	u32 mask;
+	u32 tstart;
+
+	assert(!in_own_cluster(c_ptr->addr));
+	if (!ulim)
+		return 0;
+
+	/* Start entry must be random */
+	mask = tipc_max_nodes;
+	while (mask > ulim)
+		mask >>= 1;
+	tstart = ref & mask;
+	n_num = tstart;
+
+	/* Lookup upwards with wrap-around */
+	do {
+		if (node_is_up(c_ptr->nodes[n_num]))
+			break;
+	} while (++n_num <= ulim);
+	if (n_num > ulim) {
+		n_num = 1;
+		do {
+			if (node_is_up(c_ptr->nodes[n_num]))
+				break;
+		} while (++n_num < tstart);
+		if (n_num == tstart)
+			return 0;
+	}
+	assert(n_num <= ulim);
+	return node_select_router(c_ptr->nodes[n_num], ref);
+}
+
+/**
+ * cluster_select_node - select destination node within a remote cluster
+ * 
+ * Uses deterministic and fair algorithm.
+ */
+
+struct node *cluster_select_node(struct cluster *c_ptr, u32 selector)
+{
+	u32 n_num;
+	u32 mask = tipc_max_nodes;
+	u32 start_entry;
+
+	assert(!in_own_cluster(c_ptr->addr));
+	if (!c_ptr->highest_node)
+		return 0;
+
+	/* Start entry must be random */
+	while (mask > c_ptr->highest_node) {
+		mask >>= 1;
+	}
+	start_entry = (selector & mask) ? selector & mask : 1u;
+	assert(start_entry <= c_ptr->highest_node);
+
+	/* Lookup upwards with wrap-around */
+	for (n_num = start_entry; n_num <= c_ptr->highest_node; n_num++) {
+		if (node_has_active_links(c_ptr->nodes[n_num]))
+			return c_ptr->nodes[n_num];
+	}
+	for (n_num = 1; n_num < start_entry; n_num++) {
+		if (node_has_active_links(c_ptr->nodes[n_num]))
+			return c_ptr->nodes[n_num];
+	}
+	return 0;
+}
+
+/*
+ *    Routing table management: See description in node.c
+ */
+
+struct sk_buff *cluster_prepare_routing_msg(u32 data_size, u32 dest)
+{
+	u32 size = INT_H_SIZE + data_size;
+	struct sk_buff *buf = buf_acquire(size);
+	struct tipc_msg *msg;
+
+	if (buf) {
+		msg = buf_msg(buf);
+		memset((char *)msg, 0, size);
+		msg_init(msg, ROUTE_DISTRIBUTOR, 0, TIPC_OK, INT_H_SIZE, dest);
+	}
+	return buf;
+}
+
+void cluster_bcast_new_route(struct cluster *c_ptr, u32 dest,
+			     u32 lower, u32 upper)
+{
+	struct sk_buff *buf = cluster_prepare_routing_msg(0, c_ptr->addr);
+	struct tipc_msg *msg;
+
+	if (buf) {
+		msg = buf_msg(buf);
+		msg_set_remote_node(msg, dest);
+		msg_set_type(msg, ROUTE_ADDITION);
+		cluster_multicast(c_ptr, buf, lower, upper);
+	} else {
+		warn("Memory squeeze: broadcast of new route failed\n");
+	}
+}
+
+void cluster_bcast_lost_route(struct cluster *c_ptr, u32 dest,
+			      u32 lower, u32 upper)
+{
+	struct sk_buff *buf = cluster_prepare_routing_msg(0, c_ptr->addr);
+	struct tipc_msg *msg;
+
+	if (buf) {
+		msg = buf_msg(buf);
+		msg_set_remote_node(msg, dest);
+		msg_set_type(msg, ROUTE_REMOVAL);
+		cluster_multicast(c_ptr, buf, lower, upper);
+	} else {
+		warn("Memory squeeze: broadcast of lost route failed\n");
+	}
+}
+
+void cluster_send_slave_routes(struct cluster *c_ptr, u32 dest)
+{
+	struct sk_buff *buf;
+	struct tipc_msg *msg;
+	u32 highest = c_ptr->highest_slave;
+	u32 n_num;
+	int send = 0;
+
+	assert(!is_slave(dest));
+	assert(in_own_cluster(dest));
+	assert(in_own_cluster(c_ptr->addr));
+	if (highest <= LOWEST_SLAVE)
+		return;
+	buf = cluster_prepare_routing_msg(highest - LOWEST_SLAVE + 1,
+					  c_ptr->addr);
+	if (buf) {
+		msg = buf_msg(buf);
+		msg_set_remote_node(msg, c_ptr->addr);
+		msg_set_type(msg, SLAVE_ROUTING_TABLE);
+		for (n_num = LOWEST_SLAVE; n_num <= highest; n_num++) {
+			if (c_ptr->nodes[n_num] && 
+			    node_has_active_links(c_ptr->nodes[n_num])) {
+				send = 1;
+				msg_set_dataoctet(msg, n_num);
+			}
+		}
+		if (send)
+			link_send(buf, dest, dest);
+		else
+			buf_discard(buf);
+	} else {
+		warn("Memory squeeze: broadcast of lost route failed\n");
+	}
+}
+
+void cluster_send_ext_routes(struct cluster *c_ptr, u32 dest)
+{
+	struct sk_buff *buf;
+	struct tipc_msg *msg;
+	u32 highest = c_ptr->highest_node;
+	u32 n_num;
+	int send = 0;
+
+	if (in_own_cluster(c_ptr->addr))
+		return;
+	assert(!is_slave(dest));
+	assert(in_own_cluster(dest));
+	highest = c_ptr->highest_node;
+	buf = cluster_prepare_routing_msg(highest + 1, c_ptr->addr);
+	if (buf) {
+		msg = buf_msg(buf);
+		msg_set_remote_node(msg, c_ptr->addr);
+		msg_set_type(msg, EXT_ROUTING_TABLE);
+		for (n_num = 1; n_num <= highest; n_num++) {
+			if (c_ptr->nodes[n_num] && 
+			    node_has_active_links(c_ptr->nodes[n_num])) {
+				send = 1;
+				msg_set_dataoctet(msg, n_num);
+			}
+		}
+		if (send)
+			link_send(buf, dest, dest);
+		else
+			buf_discard(buf);
+	} else {
+		warn("Memory squeeze: broadcast of external route failed\n");
+	}
+}
+
+void cluster_send_local_routes(struct cluster *c_ptr, u32 dest)
+{
+	struct sk_buff *buf;
+	struct tipc_msg *msg;
+	u32 highest = c_ptr->highest_node;
+	u32 n_num;
+	int send = 0;
+
+	assert(is_slave(dest));
+	assert(in_own_cluster(c_ptr->addr));
+	buf = cluster_prepare_routing_msg(highest, c_ptr->addr);
+	if (buf) {
+		msg = buf_msg(buf);
+		msg_set_remote_node(msg, c_ptr->addr);
+		msg_set_type(msg, LOCAL_ROUTING_TABLE);
+		for (n_num = 1; n_num <= highest; n_num++) {
+			if (c_ptr->nodes[n_num] && 
+			    node_has_active_links(c_ptr->nodes[n_num])) {
+				send = 1;
+				msg_set_dataoctet(msg, n_num);
+			}
+		}
+		if (send)
+			link_send(buf, dest, dest);
+		else
+			buf_discard(buf);
+	} else {
+		warn("Memory squeeze: broadcast of local route failed\n");
+	}
+}
+
+void cluster_recv_routing_table(struct sk_buff *buf)
+{
+	struct tipc_msg *msg = buf_msg(buf);
+	struct cluster *c_ptr;
+	struct node *n_ptr;
+	unchar *node_table;
+	u32 table_size;
+	u32 router;
+	u32 rem_node = msg_remote_node(msg);
+	u32 z_num;
+	u32 c_num;
+	u32 n_num;
+
+	c_ptr = cluster_find(rem_node);
+	if (!c_ptr) {
+		c_ptr = cluster_create(rem_node);
+		if (!c_ptr) {
+			buf_discard(buf);
+			return;
+		}
+	}
+
+	node_table = buf->data + msg_hdr_sz(msg);
+	table_size = msg_size(msg) - msg_hdr_sz(msg);
+	router = msg_prevnode(msg);
+	z_num = tipc_zone(rem_node);
+	c_num = tipc_cluster(rem_node);
+
+	switch (msg_type(msg)) {
+	case LOCAL_ROUTING_TABLE:
+		assert(is_slave(tipc_own_addr));
+	case EXT_ROUTING_TABLE:
+		for (n_num = 1; n_num < table_size; n_num++) {
+			if (node_table[n_num]) {
+				u32 addr = tipc_addr(z_num, c_num, n_num);
+				n_ptr = c_ptr->nodes[n_num];
+				if (!n_ptr) {
+					n_ptr = node_create(addr);
+				}
+				if (n_ptr)
+					node_add_router(n_ptr, router);
+			}
+		}
+		break;
+	case SLAVE_ROUTING_TABLE:
+		assert(!is_slave(tipc_own_addr));
+		assert(in_own_cluster(c_ptr->addr));
+		for (n_num = 1; n_num < table_size; n_num++) {
+			if (node_table[n_num]) {
+				u32 slave_num = n_num + LOWEST_SLAVE;
+				u32 addr = tipc_addr(z_num, c_num, slave_num);
+				n_ptr = c_ptr->nodes[slave_num];
+				if (!n_ptr) {
+					n_ptr = node_create(addr);
+				}
+				if (n_ptr)
+					node_add_router(n_ptr, router);
+			}
+		}
+		break;
+	case ROUTE_ADDITION:
+		if (!is_slave(tipc_own_addr)) {
+			assert(!in_own_cluster(c_ptr->addr)
+			       || is_slave(rem_node));
+		} else {
+			assert(in_own_cluster(c_ptr->addr)
+			       && !is_slave(rem_node));
+		}
+		n_ptr = c_ptr->nodes[tipc_node(rem_node)];
+		if (!n_ptr)
+			n_ptr = node_create(rem_node);
+		if (n_ptr)
+			node_add_router(n_ptr, router);
+		break;
+	case ROUTE_REMOVAL:
+		if (!is_slave(tipc_own_addr)) {
+			assert(!in_own_cluster(c_ptr->addr)
+			       || is_slave(rem_node));
+		} else {
+			assert(in_own_cluster(c_ptr->addr)
+			       && !is_slave(rem_node));
+		}
+		n_ptr = c_ptr->nodes[tipc_node(rem_node)];
+		if (n_ptr)
+			node_remove_router(n_ptr, router);
+		break;
+	default:
+		assert(!"Illegal routing manager message received\n");
+	}
+	buf_discard(buf);
+}
+
+void cluster_remove_as_router(struct cluster *c_ptr, u32 router)
+{
+	u32 start_entry;
+	u32 tstop;
+	u32 n_num;
+
+	if (is_slave(router))
+		return;	/* Slave nodes can not be routers */
+
+	if (in_own_cluster(c_ptr->addr)) {
+		start_entry = LOWEST_SLAVE;
+		tstop = c_ptr->highest_slave;
+	} else {
+		start_entry = 1;
+		tstop = c_ptr->highest_node;
+	}
+
+	for (n_num = start_entry; n_num <= tstop; n_num++) {
+		if (c_ptr->nodes[n_num]) {
+			node_remove_router(c_ptr->nodes[n_num], router);
+		}
+	}
+}
+
+/**
+ * cluster_multicast - multicast message to local nodes 
+ */
+
+void cluster_multicast(struct cluster *c_ptr, struct sk_buff *buf, 
+		       u32 lower, u32 upper)
+{
+	struct sk_buff *buf_copy;
+	struct node *n_ptr;
+	u32 n_num;
+	u32 tstop;
+
+	assert(lower <= upper);
+	assert(((lower >= 1) && (lower <= tipc_max_nodes)) ||
+	       ((lower >= LOWEST_SLAVE) && (lower <= highest_allowed_slave)));
+	assert(((upper >= 1) && (upper <= tipc_max_nodes)) ||
+	       ((upper >= LOWEST_SLAVE) && (upper <= highest_allowed_slave)));
+	assert(in_own_cluster(c_ptr->addr));
+
+	tstop = is_slave(upper) ? c_ptr->highest_slave : c_ptr->highest_node;
+	if (tstop > upper)
+		tstop = upper;
+	for (n_num = lower; n_num <= tstop; n_num++) {
+		n_ptr = c_ptr->nodes[n_num];
+		if (n_ptr && node_has_active_links(n_ptr)) {
+			buf_copy = skb_copy(buf, GFP_ATOMIC);
+			if (buf_copy == NULL)
+				break;
+			msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
+			link_send(buf_copy, n_ptr->addr, n_ptr->addr);
+		}
+	}
+	buf_discard(buf);
+}
+
+/**
+ * cluster_broadcast - broadcast message to all nodes within cluster
+ */
+
+void cluster_broadcast(struct sk_buff *buf)
+{
+	struct sk_buff *buf_copy;
+	struct cluster *c_ptr;
+	struct node *n_ptr;
+	u32 n_num;
+	u32 tstart;
+	u32 tstop;
+	u32 node_type;
+
+	if (tipc_mode == TIPC_NET_MODE) {
+		c_ptr = cluster_find(tipc_own_addr);
+		assert(in_own_cluster(c_ptr->addr));	/* For now */
+
+		/* Send to standard nodes, then repeat loop sending to slaves */
+		tstart = 1;
+		tstop = c_ptr->highest_node;
+		for (node_type = 1; node_type <= 2; node_type++) {
+			for (n_num = tstart; n_num <= tstop; n_num++) {
+				n_ptr = c_ptr->nodes[n_num];
+				if (n_ptr && node_has_active_links(n_ptr)) {
+					buf_copy = skb_copy(buf, GFP_ATOMIC);
+					if (buf_copy == NULL)
+						goto exit;
+					msg_set_destnode(buf_msg(buf_copy), 
+							 n_ptr->addr);
+					link_send(buf_copy, n_ptr->addr, 
+						  n_ptr->addr);
+				}
+			}
+			tstart = LOWEST_SLAVE;
+			tstop = c_ptr->highest_slave;
+		}
+	}
+exit:
+	buf_discard(buf);
+}
+
+int cluster_init(void)
+{
+	highest_allowed_slave = LOWEST_SLAVE + tipc_max_slaves;
+	return cluster_create(tipc_own_addr) ? TIPC_OK : -ENOMEM;
+}
+