Verbs API

The code returns:

• 0, if the destination is reachable using OFED iWARP/RNIC verbs.
• An error, if the communication with the destination cannot be established through an RNIC device, but might be possible with the InfiniBand architecture.

/*The following check_ofed_verbs_support routine does:
/*					- Call rdma_create_event_channel	to open a channel event					*/
/*					- Calls rdma_create_id() to get a cm_id													*/
/*					- And then calls rdma_resolve_addr()														*/
/*					- Get the communication event																	*/
/*					- Returns the event status:																		*/
/*								0: OK																									*/
/*								error: NOK  output device may be not a RNIC device					*/
/*					- Calls rdma_destroy_id() to delete the cm_id created							*/
/*					- Call rdma_destroy_event_channel  to close a channel event				*/

			int check_ofed_verbs_support (struct sockaddr *remoteaddr) 
			{  
						struct rdma_event channel *cm_channel; 
						struct rdma_cm_id *cm_id; 
						int ret=0;
						cm_channel = rdma_create_event_channel(); 
						if (!cm_channel)  {
								fprintf(stderr,"rdma_create_event_channel error\n");
								return -1; 
						}
						ret = rdma_create_id(cm_channel, &cm_id, NULL, RDMA_PS_TCP);
						if (ret) {
								fprintf(stderr,"rdma_create_id: %d\n", ret);
								rdma_destroy_event_channel(cm_channel);
								return(ret);
						}
						ret = rdma_resolve_addr(cm_id, NULL, remoteaddr, RESOLVE_TIMEOUT_MS);
						if (ret) {
								fprintf(stderr,"rdma_resolve_addr: %d\n", ret);
								goto out;
						}
						ret = rdma_get_cm_event(cm_channel, &event); 
						if (ret) {
								fprintf(stderr," rdma_get_cm_event() failed\n");
								goto out;
						}
						ret = event->status;
						rdma_ack_cm_event(event);
			out:
						rdma_destroy_id(cm_id);
						rdma_destroy_event_channel(cm_channel);
						return(ret);
			}