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tipc: enqueue arrived buffers in socket in separate function

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The code for enqueuing arriving buffers in the function tipc_sk_rcv()
contains long code lines and currently goes to two indentation levels.
As a cosmetic preparaton for the next commits, we break it out into
a separate function.

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 2015-02-05 08:36:38 -05:00 committed by David S. Miller
parent 1186adf7df
commit d570d86497
1 changed files with 31 additions and 15 deletions
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46
net/tipc/socket.c
View File

@ -1764,6 +1764,35 @@ static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
return 0;
}
/**
* tipc_sk_enqueue_skb - enqueue buffer to socket or backlog queue
* @sk: socket
* @skb: pointer to message. Set to NULL if buffer is consumed.
* @dnode: if buffer should be forwarded/returned, send to this node
*
* Caller must hold socket lock
*
* Returns TIPC_OK (0) or -tipc error code
*/
static int tipc_sk_enqueue_skb(struct sock *sk, struct sk_buff **skb)
{
unsigned int lim;
atomic_t *dcnt;
if (unlikely(!*skb))
return TIPC_OK;
if (!sock_owned_by_user(sk))
return filter_rcv(sk, skb);
dcnt = &tipc_sk(sk)->dupl_rcvcnt;
if (sk->sk_backlog.len)
atomic_set(dcnt, 0);
lim = rcvbuf_limit(sk, *skb) + atomic_read(dcnt);
if (unlikely(sk_add_backlog(sk, *skb, lim)))
return -TIPC_ERR_OVERLOAD;
*skb = NULL;
return TIPC_OK;
}
/**
* tipc_sk_rcv - handle incoming message
* @skb: buffer containing arriving message
@ -1776,8 +1805,7 @@ int tipc_sk_rcv(struct net *net, struct sk_buff *skb)
struct tipc_net *tn;
struct sock *sk;
u32 dport = msg_destport(buf_msg(skb));
int err = TIPC_OK;
uint limit;
int err;
u32 dnode;
/* Validate destination and message */
@ -1788,20 +1816,8 @@ int tipc_sk_rcv(struct net *net, struct sk_buff *skb)
}
sk = &tsk->sk;
/* Queue message */
spin_lock_bh(&sk->sk_lock.slock);
if (!sock_owned_by_user(sk)) {
err = filter_rcv(sk, &skb);
} else {
if (sk->sk_backlog.len == 0)
atomic_set(&tsk->dupl_rcvcnt, 0);
limit = rcvbuf_limit(sk, skb) + atomic_read(&tsk->dupl_rcvcnt);
if (likely(!sk_add_backlog(sk, skb, limit)))
skb = NULL;
else
err = -TIPC_ERR_OVERLOAD;
}
err = tipc_sk_enqueue_skb(sk, &skb);
spin_unlock_bh(&sk->sk_lock.slock);
sock_put(sk);
exit: