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tipc: improve destination linked list

Browse source 
We often see a need for a linked list of destination identities,
sometimes containing a port number, sometimes a node identity, and
sometimes both. The currently defined struct u32_list is not generic
enough to cover all cases, so we extend it to contain two u32 integers
and rename it to struct tipc_dest_list.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy 2017-10-13 11:04:22 +02:00 committed by David S. Miller
parent f70d37b796
commit a80ae5306a
4 changed files with 74 additions and 67 deletions
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18
net/tipc/bcast.c
View file

@ -258,20 +258,20 @@ static int tipc_bcast_xmit(struct net *net, struct sk_buff_head *pkts,
static int tipc_rcast_xmit(struct net *net, struct sk_buff_head *pkts,
struct tipc_nlist *dests, u16 *cong_link_cnt)
{
struct tipc_dest *dst, *tmp;
struct sk_buff_head _pkts;
struct u32_item *n, *tmp;
u32 dst, selector;
u32 dnode, selector;
selector = msg_link_selector(buf_msg(skb_peek(pkts)));
skb_queue_head_init(&_pkts);
list_for_each_entry_safe(n, tmp, &dests->list, list) {
dst = n->value;
if (!tipc_msg_pskb_copy(dst, pkts, &_pkts))
list_for_each_entry_safe(dst, tmp, &dests->list, list) {
dnode = dst->node;
if (!tipc_msg_pskb_copy(dnode, pkts, &_pkts))
return -ENOMEM;
/* Any other return value than -ELINKCONG is ignored */
if (tipc_node_xmit(net, &_pkts, dst, selector) == -ELINKCONG)
if (tipc_node_xmit(net, &_pkts, dnode, selector) == -ELINKCONG)
(*cong_link_cnt)++;
}
return 0;
@ -554,7 +554,7 @@ void tipc_nlist_add(struct tipc_nlist *nl, u32 node)
{
if (node == nl->self)
nl->local = true;
else if (u32_push(&nl->list, node))
else if (tipc_dest_push(&nl->list, node, 0))
nl->remote++;
}
@ -562,13 +562,13 @@ void tipc_nlist_del(struct tipc_nlist *nl, u32 node)
{
if (node == nl->self)
nl->local = false;
else if (u32_del(&nl->list, node))
else if (tipc_dest_del(&nl->list, node, 0))
nl->remote--;
}
void tipc_nlist_purge(struct tipc_nlist *nl)
{
u32_list_purge(&nl->list);
tipc_dest_list_purge(&nl->list);
nl->remote = 0;
nl->local = 0;
}

89
net/tipc/name_table.c
View file

@ -634,7 +634,7 @@ int tipc_nametbl_mc_translate(struct net *net, u32 type, u32 lower, u32 upper,
info = sseq->info;
list_for_each_entry(publ, &info->node_list, node_list) {
if (publ->scope <= limit)
u32_push(dports, publ->ref);
tipc_dest_push(dports, 0, publ->ref);
}
if (info->cluster_list_size != info->node_list_size)
@ -1057,78 +1057,79 @@ int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}
bool u32_find(struct list_head *l, u32 value)
struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port)
{
struct u32_item *item;
u64 value = (u64)node << 32 | port;
struct tipc_dest *dst;
list_for_each_entry(item, l, list) {
if (item->value == value)
return true;
list_for_each_entry(dst, l, list) {
if (dst->value != value)
continue;
return dst;
}
return false;
return NULL;
}
bool u32_push(struct list_head *l, u32 value)
bool tipc_dest_push(struct list_head *l, u32 node, u32 port)
{
struct u32_item *item;
u64 value = (u64)node << 32 | port;
struct tipc_dest *dst;
list_for_each_entry(item, l, list) {
if (item->value == value)
return false;
}
item = kmalloc(sizeof(*item), GFP_ATOMIC);
if (unlikely(!item))
if (tipc_dest_find(l, node, port))
return false;
item->value = value;
list_add(&item->list, l);
dst = kmalloc(sizeof(*dst), GFP_ATOMIC);
if (unlikely(!dst))
return false;
dst->value = value;
list_add(&dst->list, l);
return true;
}
u32 u32_pop(struct list_head *l)
bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port)
{
struct u32_item *item;
u32 value = 0;
struct tipc_dest *dst;
if (list_empty(l))
return 0;
item = list_first_entry(l, typeof(*item), list);
value = item->value;
list_del(&item->list);
kfree(item);
return value;
return false;
dst = list_first_entry(l, typeof(*dst), list);
if (port)
*port = dst->port;
if (node)
*node = dst->node;
list_del(&dst->list);
kfree(dst);
return true;
}
bool u32_del(struct list_head *l, u32 value)
bool tipc_dest_del(struct list_head *l, u32 node, u32 port)
{
struct u32_item *item, *tmp;
struct tipc_dest *dst;
list_for_each_entry_safe(item, tmp, l, list) {
if (item->value != value)
continue;
list_del(&item->list);
kfree(item);
return true;
}
return false;
dst = tipc_dest_find(l, node, port);
if (!dst)
return false;
list_del(&dst->list);
kfree(dst);
return true;
}
void u32_list_purge(struct list_head *l)
void tipc_dest_list_purge(struct list_head *l)
{
struct u32_item *item, *tmp;
struct tipc_dest *dst, *tmp;
list_for_each_entry_safe(item, tmp, l, list) {
list_del(&item->list);
kfree(item);
list_for_each_entry_safe(dst, tmp, l, list) {
list_del(&dst->list);
kfree(dst);
}
}
int u32_list_len(struct list_head *l)
int tipc_dest_list_len(struct list_head *l)
{
struct u32_item *item;
struct tipc_dest *dst;
int i = 0;
list_for_each_entry(item, l, list) {
list_for_each_entry(dst, l, list) {
i++;
}
return i;

22
net/tipc/name_table.h
View file

@ -120,16 +120,22 @@ void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
int tipc_nametbl_init(struct net *net);
void tipc_nametbl_stop(struct net *net);
struct u32_item {
struct tipc_dest {
struct list_head list;
u32 value;
union {
struct {
u32 port;
u32 node;
};
u64 value;
};
};
bool u32_push(struct list_head *l, u32 value);
u32 u32_pop(struct list_head *l);
bool u32_find(struct list_head *l, u32 value);
bool u32_del(struct list_head *l, u32 value);
void u32_list_purge(struct list_head *l);
int u32_list_len(struct list_head *l);
struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port);
bool tipc_dest_push(struct list_head *l, u32 node, u32 port);
bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port);
bool tipc_dest_del(struct list_head *l, u32 node, u32 port);
void tipc_dest_list_purge(struct list_head *l);
int tipc_dest_list_len(struct list_head *l);
#endif

12
net/tipc/socket.c
View file

@ -565,7 +565,7 @@ static int tipc_release(struct socket *sock)
/* Reject any messages that accumulated in backlog queue */
release_sock(sk);
u32_list_purge(&tsk->cong_links);
tipc_dest_list_purge(&tsk->cong_links);
tsk->cong_link_cnt = 0;
call_rcu(&tsk->rcu, tipc_sk_callback);
sock->sk = NULL;
@ -826,8 +826,7 @@ void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
tipc_nametbl_mc_translate(net,
msg_nametype(msg), msg_namelower(msg),
msg_nameupper(msg), scope, &dports);
portid = u32_pop(&dports);
for (; portid; portid = u32_pop(&dports)) {
while (tipc_dest_pop(&dports, NULL, &portid)) {
_skb = __pskb_copy(skb, hsz, GFP_ATOMIC);
if (_skb) {
msg_set_destport(buf_msg(_skb), portid);
@ -1000,7 +999,8 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
}
/* Block or return if destination link is congested */
rc = tipc_wait_for_cond(sock, &timeout, !u32_find(clinks, dnode));
rc = tipc_wait_for_cond(sock, &timeout,
!tipc_dest_find(clinks, dnode, 0));
if (unlikely(rc))
return rc;
@ -1012,7 +1012,7 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
if (unlikely(rc == -ELINKCONG)) {
u32_push(clinks, dnode);
tipc_dest_push(clinks, dnode, 0);
tsk->cong_link_cnt++;
rc = 0;
}
@ -1549,7 +1549,7 @@ static void tipc_sk_proto_rcv(struct sock *sk,
tipc_sk_conn_proto_rcv(tsk, skb, xmitq);
return;
case SOCK_WAKEUP:
u32_del(&tsk->cong_links, msg_orignode(hdr));
tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
tsk->cong_link_cnt--;
sk->sk_write_space(sk);
break;