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tipc: use generic SKB list APIs to manage deferred queue of link

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Use standard SKB list APIs associated with struct sk_buff_head to
manage link's deferred queue, simplifying relevant code.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ying Xue 2014-11-26 11:41:53 +08:00 • committed by David S. Miller
parent 58dc55f256
commit bc6fecd409
5 changed files with 47 additions and 69 deletions
Download patch file Download diff file Expand all files Collapse all files

74
net/tipc/link.c
View file

@ -292,6 +292,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
l_ptr->next_out_no = 1;
__skb_queue_head_init(&l_ptr->outqueue);
__skb_queue_head_init(&l_ptr->deferred_queue);
__skb_queue_head_init(&l_ptr->waiting_sks);
link_reset_statistics(l_ptr);
@ -398,7 +399,7 @@ void tipc_link_reset_fragments(struct tipc_link *l_ptr)
*/
void tipc_link_purge_queues(struct tipc_link *l_ptr)
{
kfree_skb_list(l_ptr->oldest_deferred_in);
__skb_queue_purge(&l_ptr->deferred_queue);
__skb_queue_purge(&l_ptr->outqueue);
tipc_link_reset_fragments(l_ptr);
}
@ -433,7 +434,7 @@ void tipc_link_reset(struct tipc_link *l_ptr)
/* Clean up all queues: */
__skb_queue_purge(&l_ptr->outqueue);
kfree_skb_list(l_ptr->oldest_deferred_in);
__skb_queue_purge(&l_ptr->deferred_queue);
if (!skb_queue_empty(&l_ptr->waiting_sks)) {
skb_queue_splice_init(&l_ptr->waiting_sks, &owner->waiting_sks);
owner->action_flags |= TIPC_WAKEUP_USERS;
@ -442,9 +443,6 @@ void tipc_link_reset(struct tipc_link *l_ptr)
l_ptr->unacked_window = 0;
l_ptr->checkpoint = 1;
l_ptr->next_out_no = 1;
l_ptr->deferred_inqueue_sz = 0;
l_ptr->oldest_deferred_in = NULL;
l_ptr->newest_deferred_in = NULL;
l_ptr->fsm_msg_cnt = 0;
l_ptr->stale_count = 0;
link_reset_statistics(l_ptr);
@ -974,19 +972,23 @@ void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
static struct sk_buff *link_insert_deferred_queue(struct tipc_link *l_ptr,
struct sk_buff *buf)
{
struct sk_buff_head head;
struct sk_buff *skb = NULL;
u32 seq_no;
if (l_ptr->oldest_deferred_in == NULL)
if (skb_queue_empty(&l_ptr->deferred_queue))
return buf;
seq_no = buf_seqno(l_ptr->oldest_deferred_in);
seq_no = buf_seqno(skb_peek(&l_ptr->deferred_queue));
if (seq_no == mod(l_ptr->next_in_no)) {
l_ptr->newest_deferred_in->next = buf;
buf = l_ptr->oldest_deferred_in;
l_ptr->oldest_deferred_in = NULL;
l_ptr->deferred_inqueue_sz = 0;
__skb_queue_head_init(&head);
skb_queue_splice_tail_init(&l_ptr->deferred_queue, &head);
skb = head.next;
skb->prev = NULL;
head.prev->next = buf;
head.prev->prev = NULL;
}
return buf;
return skb;
}
/**
@ -1170,7 +1172,7 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
continue;
}
l_ptr->next_in_no++;
if (unlikely(l_ptr->oldest_deferred_in))
if (unlikely(!skb_queue_empty(&l_ptr->deferred_queue)))
head = link_insert_deferred_queue(l_ptr, head);
if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
@ -1273,48 +1275,37 @@ static int tipc_link_input(struct tipc_link *l, struct sk_buff *buf)
*
* Returns increase in queue length (i.e. 0 or 1)
*/
u32 tipc_link_defer_pkt(struct sk_buff **head, struct sk_buff **tail,
struct sk_buff *buf)
u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
{
struct sk_buff *queue_buf;
struct sk_buff **prev;
u32 seq_no = buf_seqno(buf);
buf->next = NULL;
struct sk_buff *skb1;
u32 seq_no = buf_seqno(skb);
/* Empty queue ? */
if (*head == NULL) {
*head = *tail = buf;
if (skb_queue_empty(list)) {
__skb_queue_tail(list, skb);
return 1;
}
/* Last ? */
if (less(buf_seqno(*tail), seq_no)) {
(*tail)->next = buf;
*tail = buf;
if (less(buf_seqno(skb_peek_tail(list)), seq_no)) {
__skb_queue_tail(list, skb);
return 1;
}
/* Locate insertion point in queue, then insert; discard if duplicate */
prev = head;
queue_buf = *head;
for (;;) {
u32 curr_seqno = buf_seqno(queue_buf);
skb_queue_walk(list, skb1) {
u32 curr_seqno = buf_seqno(skb1);
if (seq_no == curr_seqno) {
kfree_skb(buf);
kfree_skb(skb);
return 0;
}
if (less(seq_no, curr_seqno))
break;
prev = &queue_buf->next;
queue_buf = queue_buf->next;
}
buf->next = queue_buf;
*prev = buf;
__skb_queue_before(list, skb1, skb);
return 1;
}
@ -1344,15 +1335,14 @@ static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
return;
}
if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
&l_ptr->newest_deferred_in, buf)) {
l_ptr->deferred_inqueue_sz++;
if (tipc_link_defer_pkt(&l_ptr->deferred_queue, buf)) {
l_ptr->stats.deferred_recv++;
TIPC_SKB_CB(buf)->deferred = true;
if ((l_ptr->deferred_inqueue_sz % 16) == 1)
if ((skb_queue_len(&l_ptr->deferred_queue) % 16) == 1)
tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
} else
} else {
l_ptr->stats.duplicates++;
}
}
/*
@ -1388,8 +1378,8 @@ void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
if (l_ptr->next_out)
next_sent = buf_seqno(l_ptr->next_out);
msg_set_next_sent(msg, next_sent);
if (l_ptr->oldest_deferred_in) {
u32 rec = buf_seqno(l_ptr->oldest_deferred_in);
if (!skb_queue_empty(&l_ptr->deferred_queue)) {
u32 rec = buf_seqno(skb_peek(&l_ptr->deferred_queue));
gap = mod(rec - mod(l_ptr->next_in_no));
}
msg_set_seq_gap(msg, gap);