On Tue, Sep 26, 2023 at 02:41:04PM +0300, Leon Romanovsky wrote: >On Tue, Sep 26, 2023 at 01:14:04PM +0200, Alexandra Winter wrote: >> >> >> On 26.09.23 12:48, Leon Romanovsky wrote: >> > This patch made me wonder, why doesn't SMC use RDMA-CM like all other >> > in-kernel ULPs which work over RDMA? >> > >> > Thanks >> >> The idea behind SMC is that it should look an feel to the applications >> like TCP sockets. So for connection management it uses TCP over IP; >> RDMA is just used for the data transfer. > >I think that it is not different from other ULPs. For example, RDS works >over sockets and doesn't touch or reimplement GID management logic. I think the difference is SMC socket need to be compatible with TCP socket, so it need a tcp socket to fallback when something is not working. If SMC works with rdmacm, it still need a fallback-to-tcp socket, and the tcp connection has to be established for each SMC socket before the SMC socket got established, that would make rdmacm meaningless. Best regards, Dust > >Thanks
