why should the server prepost the recv request before building connection with the client?

[MtKawakarpo]

Hi,

I try to move the code " if (ibv_post_recv(cm_id->qp, &recv_wr, &bad_recv_wr)) return 1" to the location before waiting for /* Wait for receive completion */, but the program failed to function normally. why should the server prepost the recv request before building connection with the client? Thanks for replying!