xprtrdma: Take struct ib_qp_attr and ib_qp_init_attr off the stack

Reduce stack footprint of the connection upcall handler function.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 123bb04dd823..958b372cb919 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -425,8 +425,8 @@ rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
         struct sockaddr_in *addr = (struct sockaddr_in *) &ep->rep_remote_addr;
 #endif
-        struct ib_qp_attr attr;
-        struct ib_qp_init_attr iattr;
+        struct ib_qp_attr *attr = &ia->ri_qp_attr;
+        struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr;
         int connstate = 0;
 
         switch (event->event) {
@@ -449,12 +449,13 @@ rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
                 break;
         case RDMA_CM_EVENT_ESTABLISHED:
                 connstate = 1;
-                ib_query_qp(ia->ri_id->qp, &attr,
-                        IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
-                        &iattr);
+                ib_query_qp(ia->ri_id->qp, attr,
+                            IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
+                            iattr);
                 dprintk("RPC:       %s: %d responder resources"
                         " (%d initiator)\n",
-                        __func__, attr.max_dest_rd_atomic, attr.max_rd_atomic);
+                        __func__, attr->max_dest_rd_atomic,
+                        attr->max_rd_atomic);
                 goto connected;
         case RDMA_CM_EVENT_CONNECT_ERROR:
                 connstate = -ENOTCONN;
@@ -487,7 +488,7 @@ connected:
 
 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
         if (connstate == 1) {
-                int ird = attr.max_dest_rd_atomic;
+                int ird = attr->max_dest_rd_atomic;
                 int tird = ep->rep_remote_cma.responder_resources;
                 printk(KERN_INFO "rpcrdma: connection to %pI4:%u "
                         "on %s, memreg %d slots %d ird %d%s\n",