hw/rdma: Add Query QP operation

This operation is needed by rdma devices - implement it.
Signed-off-by: NYuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: NMarcel Apfelbaum <marcel@redhat.com>
Signed-off-by: NMarcel Apfelbaum <marcel@redhat.com>

hw/rdma/rdma_backend.c

@@ -646,6 +646,18 @@ int rdma_backend_qp_state_rts(RdmaBackendQP *qp, uint8_t qp_type,
     return 0;
 }
 
+int rdma_backend_query_qp(RdmaBackendQP *qp, struct ibv_qp_attr *attr,
+                          int attr_mask, struct ibv_qp_init_attr *init_attr)
+{
+    if (!qp->ibqp) {
+        pr_dbg("QP1\n");
+        attr->qp_state = IBV_QPS_RTS;
+        return 0;
+    }
+
+    return ibv_query_qp(qp->ibqp, attr, attr_mask, init_attr);
+}
+
 void rdma_backend_destroy_qp(RdmaBackendQP *qp)
 {
     if (qp->ibqp) {

hw/rdma/rdma_backend.h

@@ -83,6 +83,8 @@ int rdma_backend_qp_state_rtr(RdmaBackendDev *backend_dev, RdmaBackendQP *qp,
                               bool use_qkey);
 int rdma_backend_qp_state_rts(RdmaBackendQP *qp, uint8_t qp_type,
                               uint32_t sq_psn, uint32_t qkey, bool use_qkey);
+int rdma_backend_query_qp(RdmaBackendQP *qp, struct ibv_qp_attr *attr,
+                          int attr_mask, struct ibv_qp_init_attr *init_attr);
 void rdma_backend_destroy_qp(RdmaBackendQP *qp);
 
 void rdma_backend_post_send(RdmaBackendDev *backend_dev,

hw/rdma/rdma_rm.c

@@ -453,6 +453,24 @@ int rdma_rm_modify_qp(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev,
     return 0;
 }
 
+int rdma_rm_query_qp(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev,
+                     uint32_t qp_handle, struct ibv_qp_attr *attr,
+                     int attr_mask, struct ibv_qp_init_attr *init_attr)
+{
+    RdmaRmQP *qp;
+
+    pr_dbg("qpn=%d\n", qp_handle);
+
+    qp = rdma_rm_get_qp(dev_res, qp_handle);
+    if (!qp) {
+        return -EINVAL;
+    }
+
+    pr_dbg("qp_type=%d\n", qp->qp_type);
+
+    return rdma_backend_query_qp(&qp->backend_qp, attr, attr_mask, init_attr);
+}
+
 void rdma_rm_dealloc_qp(RdmaDeviceResources *dev_res, uint32_t qp_handle)
 {
     RdmaRmQP *qp;

hw/rdma/rdma_rm.h

@@ -59,6 +59,9 @@ int rdma_rm_modify_qp(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev,
                       union ibv_gid *dgid, uint32_t dqpn,
                       enum ibv_qp_state qp_state, uint32_t qkey,
                       uint32_t rq_psn, uint32_t sq_psn);
+int rdma_rm_query_qp(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev,
+                     uint32_t qp_handle, struct ibv_qp_attr *attr,
+                     int attr_mask, struct ibv_qp_init_attr *init_attr);
 void rdma_rm_dealloc_qp(RdmaDeviceResources *dev_res, uint32_t qp_handle);
 
 int rdma_rm_alloc_cqe_ctx(RdmaDeviceResources *dev_res, uint32_t *cqe_ctx_id,