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.

Tung Nguyen committed 7 years ago

Commit 42e54251 parent a26deec2 files · +4 −0Browse files

Unified · Split

2 files

include/uapi/linux/tipc.h +1 −0
net/tipc/socket.c +3 −0

include/uapi/linux/tipc.h+1−0

@@ -190,6 +190,7 @@ struct sockaddr_tipc { · 189 unmodified lines
190	190	#define TIPC_MCAST_REPLICAST 134 /* Default: TIPC selects. No arg */
191	191	#define TIPC_GROUP_JOIN 135 /* Takes struct tipc_group_req* */
192	192	#define TIPC_GROUP_LEAVE 136 /* No argument */
	193	+#define TIPC_SOCK_RECVQ_USED 137 /* Default: none (read only) */
193	194
194	195	/*
195	196	* Flag values

net/tipc/socket.c+3−0

@@ -3070,6 +3070,9 @@ static int tipc_getsockopt(struct socket *sock, int lvl, int opt, · 3069 unmodified lines
3070	3070	case TIPC_SOCK_RECVQ_DEPTH:
3071	3071	value = skb_queue_len(&sk->sk_receive_queue);
3072	3072	break;
	3073	+ case TIPC_SOCK_RECVQ_USED:
	3074	+ value = sk_rmem_alloc_get(sk);
	3075	+ break;
3073	3076	case TIPC_GROUP_JOIN:
3074	3077	seq.type = 0;
3075	3078	if (tsk->group)