libcapulet: commit parameters used for a functionnal demo

- Revert to 1024 MTU
- Update RNR retry parameters (retry twice)
- Change MR size to match SDR return size

include/libtrx/trx_rdma.h

@@ -11,7 +11,7 @@
 #include "libcapulet/net_udp.h"
 
 #define TRX_RDMA_MR_COUNT 32
-#define TRX_RDMA_MR_SIZE 32768
+#define TRX_RDMA_MR_SIZE 256
 #define TRX_RDMA_BUFFER_SIZE 131072
 // XXX: hardcoded parameter
 #define TRX_RDMA_CHANNEL_COUNT 2

libcapulet/rdma_ib.c

@@ -146,7 +146,7 @@ bool capulet_rdma_ib_set_peer_from_udp(struct CapuletRdmaIbContext *ctx, struct
 	// Change state from Init to RTR (Ready To Receive)
 	memset(&ibv_dev_qp_params, 0, sizeof(struct ibv_qp_attr));
 	ibv_dev_qp_params.qp_state = IBV_QPS_RTR;
-	ibv_dev_qp_params.path_mtu = IBV_MTU_4096;
+	ibv_dev_qp_params.path_mtu = IBV_MTU_1024;
 	ibv_dev_qp_params.dest_qp_num = udp_ctx->remote->qpn;
 	ibv_dev_qp_params.rq_psn = udp_ctx->remote->psn;
 	ibv_dev_qp_params.max_dest_rd_atomic = 1;
@@ -171,11 +171,11 @@ bool capulet_rdma_ib_set_peer_from_udp(struct CapuletRdmaIbContext *ctx, struct
 	// Change state from RTR to RTS (Ready To Send)
 	memset(&ibv_dev_qp_params, 0, sizeof(struct ibv_qp_attr));
 	ibv_dev_qp_params.qp_state = IBV_QPS_RTS;
-	// Debugging parameters: infinite timeout without retry
+	// Debugging parameters: infinite timeout
 	// This will make the polling wait forever when a race condition occurs
 	ibv_dev_qp_params.timeout = 0;
-	ibv_dev_qp_params.retry_cnt = 0;
-	ibv_dev_qp_params.rnr_retry = 0;
+	ibv_dev_qp_params.retry_cnt = 2;
+	ibv_dev_qp_params.rnr_retry = 2;
 	ibv_dev_qp_params.sq_psn = udp_ctx->local->psn;
 	ibv_dev_qp_params.max_rd_atomic = 1;