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tipc: introduce link entry structure to struct tipc_node

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struct 'tipc_node' currently contains two arrays for link attributes,
one for the link pointers, and one for the usable link MTUs.

We now group those into a new struct 'tipc_link_entry', and intoduce
one single array consisting of such enties. Apart from being a cosmetic
improvement, this is a starting point for the strict master-slave
relation between node and link that we will introduce in the following
commits.

Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy 2015-07-16 16:54:19 -04:00 • committed by David S. Miller
parent 6acc232660
commit 9d13ec65ed
6 changed files with 144 additions and 137 deletions
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163
net/tipc/node.c
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@ -224,126 +224,119 @@ void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
*
* Link becomes active (alone or shared) or standby, depending on its priority.
*/
void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
void tipc_node_link_up(struct tipc_node *n, int bearer_id)
{
struct tipc_link **active = &n_ptr->active_links[0];
struct tipc_link_entry **actv = &n->active_links[0];
struct tipc_link_entry *le = &n->links[bearer_id];
struct tipc_link *l = le->link;
n_ptr->working_links++;
n_ptr->action_flags |= TIPC_NOTIFY_LINK_UP;
n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id;
/* Leave room for tunnel header when returning 'mtu' to users: */
n->links[bearer_id].mtu = l->mtu - INT_H_SIZE;
n->working_links++;
n->action_flags |= TIPC_NOTIFY_LINK_UP;
n->link_id = l->peer_bearer_id << 16 | l->bearer_id;
pr_debug("Established link <%s> on network plane %c\n",
l_ptr->name, l_ptr->net_plane);
l->name, l->net_plane);
if (!active[0]) {
active[0] = active[1] = l_ptr;
node_established_contact(n_ptr);
goto exit;
/* No active links ? => take both active slots */
if (!actv[0]) {
actv[0] = le;
actv[1] = le;
node_established_contact(n);
return;
}
if (l_ptr->priority < active[0]->priority) {
pr_debug("New link <%s> becomes standby\n", l_ptr->name);
goto exit;
if (l->priority < actv[0]->link->priority) {
pr_debug("New link <%s> becomes standby\n", l->name);
return;
}
tipc_link_dup_queue_xmit(active[0], l_ptr);
if (l_ptr->priority == active[0]->priority) {
active[0] = l_ptr;
goto exit;
tipc_link_dup_queue_xmit(actv[0]->link, l);
/* Take one active slot if applicable */
if (l->priority == actv[0]->link->priority) {
actv[0] = le;
return;
}
pr_debug("Old link <%s> becomes standby\n", active[0]->name);
if (active[1] != active[0])
pr_debug("Old link <%s> becomes standby\n", active[1]->name);
active[0] = active[1] = l_ptr;
exit:
/* Leave room for changeover header when returning 'mtu' to users: */
n_ptr->act_mtus[0] = active[0]->mtu - INT_H_SIZE;
n_ptr->act_mtus[1] = active[1]->mtu - INT_H_SIZE;
/* Higher prio than current active? => take both active slots */
pr_debug("Old l <%s> becomes standby\n", actv[0]->link->name);
if (actv[1] != actv[0])
pr_debug("Old link <%s> now standby\n", actv[1]->link->name);
actv[0] = le;
actv[1] = le;
}
/**
* node_select_active_links - select active link
* node_select_active_links - select which working links should be active
*/
static void node_select_active_links(struct tipc_node *n_ptr)
static void node_select_active_links(struct tipc_node *n)
{
struct tipc_link **active = &n_ptr->active_links[0];
u32 i;
u32 highest_prio = 0;
struct tipc_link_entry **actv = &n->active_links[0];
struct tipc_link *l;
u32 b, highest = 0;
active[0] = active[1] = NULL;
actv[0] = NULL;
actv[1] = NULL;
for (i = 0; i < MAX_BEARERS; i++) {
struct tipc_link *l_ptr = n_ptr->links[i];
if (!l_ptr || !tipc_link_is_up(l_ptr) ||
(l_ptr->priority < highest_prio))
for (b = 0; b < MAX_BEARERS; b++) {
l = n->links[b].link;
if (!l || !tipc_link_is_up(l) || (l->priority < highest))
continue;
if (l->priority > highest) {
highest = l->priority;
actv[0] = &n->links[b];
actv[1] = &n->links[b];
continue;
if (l_ptr->priority > highest_prio) {
highest_prio = l_ptr->priority;
active[0] = active[1] = l_ptr;
} else {
active[1] = l_ptr;
}
actv[1] = &n->links[b];
}
}
/**
* tipc_node_link_down - handle loss of link
*/
void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
void tipc_node_link_down(struct tipc_node *n, int bearer_id)
{
struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
struct tipc_link **active;
struct tipc_link_entry **actv = &n->active_links[0];
struct tipc_link_entry *le = &n->links[bearer_id];
struct tipc_link *l = le->link;
n_ptr->working_links--;
n_ptr->action_flags |= TIPC_NOTIFY_LINK_DOWN;
n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id;
n->working_links--;
n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
n->link_id = l->peer_bearer_id << 16 | l->bearer_id;
if (!tipc_link_is_active(l_ptr)) {
if (!tipc_link_is_active(l)) {
pr_debug("Lost standby link <%s> on network plane %c\n",
l_ptr->name, l_ptr->net_plane);
l->name, l->net_plane);
return;
}
pr_debug("Lost link <%s> on network plane %c\n",
l_ptr->name, l_ptr->net_plane);
l->name, l->net_plane);
active = &n_ptr->active_links[0];
if (active[0] == l_ptr)
active[0] = active[1];
if (active[1] == l_ptr)
active[1] = active[0];
if (active[0] == l_ptr)
node_select_active_links(n_ptr);
if (tipc_node_is_up(n_ptr))
tipc_link_failover_send_queue(l_ptr);
/* Resdistribute active slots if applicable */
if (actv[0] == le)
actv[0] = actv[1];
if (actv[1] == le)
actv[1] = actv[0];
/* Last link of this priority? => select other ones if available */
if (actv[0] == le)
node_select_active_links(n);
if (tipc_node_is_up(n))
tipc_link_failover_send_queue(l);
else
node_lost_contact(n_ptr);
/* Leave room for changeover header when returning 'mtu' to users: */
if (active[0]) {
n_ptr->act_mtus[0] = active[0]->mtu - INT_H_SIZE;
n_ptr->act_mtus[1] = active[1]->mtu - INT_H_SIZE;
return;
}
/* Loopback link went down? No fragmentation needed from now on. */
if (n_ptr->addr == tn->own_addr) {
n_ptr->act_mtus[0] = MAX_MSG_SIZE;
n_ptr->act_mtus[1] = MAX_MSG_SIZE;
}
node_lost_contact(n);
}
int tipc_node_active_links(struct tipc_node *n_ptr)
bool tipc_node_is_up(struct tipc_node *n)
{
return n_ptr->active_links[0] != NULL;
}
int tipc_node_is_up(struct tipc_node *n_ptr)
{
return tipc_node_active_links(n_ptr);
return n->active_links[0];
}
void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
{
n_ptr->links[l_ptr->bearer_id] = l_ptr;
n_ptr->links[l_ptr->bearer_id].link = l_ptr;
n_ptr->link_cnt++;
}
@ -352,9 +345,9 @@ void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
int i;
for (i = 0; i < MAX_BEARERS; i++) {
if (l_ptr != n_ptr->links[i])
if (l_ptr != n_ptr->links[i].link)
continue;
n_ptr->links[i] = NULL;
n_ptr->links[i].link = NULL;
n_ptr->link_cnt--;
}
}
@ -396,7 +389,7 @@ static void node_lost_contact(struct tipc_node *n_ptr)
/* Abort any ongoing link failover */
for (i = 0; i < MAX_BEARERS; i++) {
struct tipc_link *l_ptr = n_ptr->links[i];
struct tipc_link *l_ptr = n_ptr->links[i].link;
if (!l_ptr)
continue;
l_ptr->flags &= ~LINK_FAILINGOVER;
@ -453,7 +446,7 @@ int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
goto exit;
tipc_node_lock(node);
link = node->links[bearer_id];
link = node->links[bearer_id].link;
if (link) {
strncpy(linkname, link->name, len);
err = 0;