...
>>> + rd_prepare_msg(rd, RDMA_NLDEV_CMD_NEWLINK, &seq,
>>> + (NLM_F_REQUEST | NLM_F_ACK));
>>> + mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_DEV_NAME, name);
>>> + mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_LINK_TYPE, type);
>>> + mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_NDEV_NAME, dev);
>>> + ret = rd_send_msg(rd);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + ret = rd_recv_msg(rd, link_add_parse_cb, rd, seq);
>>> + if (ret)
>>> + perror(NULL);
>> Why do you need rd_recv_msg()? I think that it is not needed, at least
>> for rename, I didn't need it.
>> https://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git/tree/rdma/dev.c#n244
> To get the response of if it was successfully added. It provides the
> errno value.
If I don't do the rd_recv_msg, then adding the same name twice fails
without any error notification. Ditto for deleting a non-existent
link. So the rd_recv_msg() allows getting the failure reason (and
detecting the failure).
