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tipc: introduce new socket option TIPC_SOCK_RECVQ_USED 

When using TIPC_SOCK_RECVQ_DEPTH for getsockopt(), it returns the
number of buffers in receive socket buffer which is not so helpful
for user space applications.

This commit introduces the new option TIPC_SOCK_RECVQ_USED which
returns the current allocated bytes of the receive socket buffer.
This helps user space applications dimension its buffer usage to
avoid buffer overload issue.

Signed-off-by: Tung Nguyen <tung.q.nguyen@dektech.com.au>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tung Nguyen 2019-04-18 21:02:19 +07:00 committed by David S. Miller
parent a26deec69f
commit 42e5425aa0
2 changed files with 4 additions and 0 deletions
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1
include/uapi/linux/tipc.h
View File

@ -190,6 +190,7 @@ struct sockaddr_tipc {
#define TIPC_MCAST_REPLICAST 134 /* Default: TIPC selects. No arg */
#define TIPC_GROUP_JOIN 135 /* Takes struct tipc_group_req* */
#define TIPC_GROUP_LEAVE 136 /* No argument */
#define TIPC_SOCK_RECVQ_USED 137 /* Default: none (read only) */
/*
* Flag values

3
net/tipc/socket.c
View File

@ -3070,6 +3070,9 @@ static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
case TIPC_SOCK_RECVQ_DEPTH:
value = skb_queue_len(&sk->sk_receive_queue);
break;
case TIPC_SOCK_RECVQ_USED:
value = sk_rmem_alloc_get(sk);
break;
case TIPC_GROUP_JOIN:
seq.type = 0;
if (tsk->group)