> we are trying to set the service level for a QP with ibv_modify_qp, but > ibv_modify_qp() returns an error (errno = EINVAL). > > We are using RDMA CM and use rdma_create_qp() to allocate the queue > pair. After some searching in the net we found posts, which indicate > that ibv_modify_qp() cannot be used to set the service level, if you are > using RDMA CM. Can anybody confirm or negate this assumption and are > there alternatives? If you're using the rdmacm, you should avoid calling ibv_modify_qp directly. The library will call it on your behalf. The service level will be set automatically when the required path record is obtained. You have a couple of options for controlling this. An IP address is mapped to an IB GID and PKey. You can assign different service levels based on different PKeys. Quality/type of service can also be set by calling rdma_set_option, using RDMA_OPTION_ID_TOS. This value ends up being used in a path record query to the SA. In both cases, the SA must be configured with the QoS values. - Sean -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
