iwarp_rdma_write
struct iwarp_rdma_write rwrite;
struct iwarp_rdma_write write;
struct iwarp_rdma_write rwrite;
.hdr_len = sizeof(struct iwarp_rdma_write),
.ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_write) - 2),
sizeof(struct iwarp_rdma_write);
struct iwarp_rdma_write *write = &srx->hdr.rwrite;
c_tx->ctrl_len = sizeof(struct iwarp_rdma_write);