tipc: clean up link creation
We simplify the link creation function tipc_link_create() and the way
the link struct it is connected to the node struct. In particular, we
remove the duplicate initialization of some fields which are anyway set
in tipc_link_reset().
Tested-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>
diff --git a/net/tipc/link.c b/net/tipc/link.c
index d683fe9..f067e54 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -147,87 +147,71 @@
return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l);
}
+static u32 link_own_addr(struct tipc_link *l)
+{
+ return msg_prevnode(l->pmsg);
+}
+
/**
* tipc_link_create - create a new link
- * @n_ptr: pointer to associated node
- * @b_ptr: pointer to associated bearer
- * @media_addr: media address to use when sending messages over link
+ * @n: pointer to associated node
+ * @b: pointer to associated bearer
+ * @ownnode: identity of own node
+ * @peer: identity of peer node
+ * @maddr: media address to be used
+ * @inputq: queue to put messages ready for delivery
+ * @namedq: queue to put binding table update messages ready for delivery
+ * @link: return value, pointer to put the created link
*
- * Returns pointer to link.
+ * Returns true if link was created, otherwise false
*/
-struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
- struct tipc_bearer *b_ptr,
- const struct tipc_media_addr *media_addr,
- struct sk_buff_head *inputq,
- struct sk_buff_head *namedq)
+bool tipc_link_create(struct tipc_node *n, struct tipc_bearer *b, u32 session,
+ u32 ownnode, u32 peer, struct tipc_media_addr *maddr,
+ struct sk_buff_head *inputq, struct sk_buff_head *namedq,
+ struct tipc_link **link)
{
- struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
- struct tipc_link *l_ptr;
- struct tipc_msg *msg;
+ struct tipc_link *l;
+ struct tipc_msg *hdr;
char *if_name;
- char addr_string[16];
- u32 peer = n_ptr->addr;
- if (n_ptr->link_cnt >= MAX_BEARERS) {
- tipc_addr_string_fill(addr_string, n_ptr->addr);
- pr_err("Cannot establish %uth link to %s. Max %u allowed.\n",
- n_ptr->link_cnt, addr_string, MAX_BEARERS);
- return NULL;
- }
+ l = kzalloc(sizeof(*l), GFP_ATOMIC);
+ if (!l)
+ return false;
+ *link = l;
- if (n_ptr->links[b_ptr->identity].link) {
- tipc_addr_string_fill(addr_string, n_ptr->addr);
- pr_err("Attempt to establish second link on <%s> to %s\n",
- b_ptr->name, addr_string);
- return NULL;
- }
+ /* Note: peer i/f name is completed by reset/activate message */
+ if_name = strchr(b->name, ':') + 1;
+ sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
+ tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode),
+ if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
- l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
- if (!l_ptr) {
- pr_warn("Link creation failed, no memory\n");
- return NULL;
- }
- l_ptr->addr = peer;
- if_name = strchr(b_ptr->name, ':') + 1;
- sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
- tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr),
- tipc_node(tn->own_addr),
- if_name,
- tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
- /* note: peer i/f name is updated by reset/activate message */
- memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
- l_ptr->owner = n_ptr;
- l_ptr->peer_session = WILDCARD_SESSION;
- l_ptr->bearer_id = b_ptr->identity;
- l_ptr->tolerance = b_ptr->tolerance;
- l_ptr->snd_nxt = 1;
- l_ptr->rcv_nxt = 1;
- l_ptr->state = LINK_RESET;
-
- l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
- msg = l_ptr->pmsg;
- tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE,
- l_ptr->addr);
- msg_set_size(msg, sizeof(l_ptr->proto_msg));
- msg_set_session(msg, (tn->random & 0xffff));
- msg_set_bearer_id(msg, b_ptr->identity);
- strcpy((char *)msg_data(msg), if_name);
- l_ptr->net_plane = b_ptr->net_plane;
- l_ptr->advertised_mtu = b_ptr->mtu;
- l_ptr->mtu = l_ptr->advertised_mtu;
- l_ptr->priority = b_ptr->priority;
- tipc_link_set_queue_limits(l_ptr, b_ptr->window);
- l_ptr->snd_nxt = 1;
- __skb_queue_head_init(&l_ptr->transmq);
- __skb_queue_head_init(&l_ptr->backlogq);
- __skb_queue_head_init(&l_ptr->deferdq);
- skb_queue_head_init(&l_ptr->wakeupq);
- l_ptr->inputq = inputq;
- l_ptr->namedq = namedq;
- skb_queue_head_init(l_ptr->inputq);
- link_reset_statistics(l_ptr);
- tipc_node_attach_link(n_ptr, l_ptr);
- return l_ptr;
+ l->addr = peer;
+ l->media_addr = maddr;
+ l->owner = n;
+ l->peer_session = WILDCARD_SESSION;
+ l->bearer_id = b->identity;
+ l->tolerance = b->tolerance;
+ l->net_plane = b->net_plane;
+ l->advertised_mtu = b->mtu;
+ l->mtu = b->mtu;
+ l->priority = b->priority;
+ tipc_link_set_queue_limits(l, b->window);
+ l->inputq = inputq;
+ l->namedq = namedq;
+ l->state = LINK_RESETTING;
+ l->pmsg = (struct tipc_msg *)&l->proto_msg;
+ hdr = l->pmsg;
+ tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer);
+ msg_set_size(hdr, sizeof(l->proto_msg));
+ msg_set_session(hdr, session);
+ msg_set_bearer_id(hdr, l->bearer_id);
+ strcpy((char *)msg_data(hdr), if_name);
+ __skb_queue_head_init(&l->transmq);
+ __skb_queue_head_init(&l->backlogq);
+ __skb_queue_head_init(&l->deferdq);
+ skb_queue_head_init(&l->wakeupq);
+ skb_queue_head_init(l->inputq);
+ return true;
}
/* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints.
@@ -643,7 +627,7 @@
u16 ack = mod(link->rcv_nxt - 1);
u16 seqno = link->snd_nxt;
u16 bc_last_in = link->owner->bclink.last_in;
- struct tipc_media_addr *addr = &link->media_addr;
+ struct tipc_media_addr *addr = link->media_addr;
struct sk_buff_head *transmq = &link->transmq;
struct sk_buff_head *backlogq = &link->backlogq;
struct sk_buff *skb, *bskb;
@@ -809,7 +793,7 @@
link->rcv_unacked = 0;
__skb_queue_tail(&link->transmq, skb);
tipc_bearer_send(link->owner->net, link->bearer_id,
- skb, &link->media_addr);
+ skb, link->media_addr);
}
link->snd_nxt = seqno;
}
@@ -912,7 +896,7 @@
msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1));
msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb,
- &l_ptr->media_addr);
+ l_ptr->media_addr);
retransmits--;
l_ptr->stats.retransmitted++;
}
@@ -1200,7 +1184,7 @@
skb = __skb_dequeue(&xmitq);
if (!skb)
return;
- tipc_bearer_send(l->owner->net, l->bearer_id, skb, &l->media_addr);
+ tipc_bearer_send(l->owner->net, l->bearer_id, skb, l->media_addr);
l->rcv_unacked = 0;
kfree_skb(skb);
}