selftests: rds: Add helper function check_info() in test.py

Hoist the page info logic in test.py into a helper function,
check_info().  This is a preparatory refactoring for the rds over ROCE
series that helps modularize the send/recv logic. Breaking up the logic
now will help avoid large function pylint errors later.  No functional
changes are introduced in this patch.

Signed-off-by: Allison Henderson <achender@kernel.org>
Link: https://patch.msgid.link/20260518012443.2629206-4-achender@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/rds/test.py

@@ -79,6 +79,36 @@ def netns_socket(netns, *sock_args):
     u1.close()
     return socket.fromfd(fds[0], *sock_args)
 
+def check_info(socks):
+    """
+    Check all rds info pages for errors
+
+    :param socks: list of sockets to check
+    """
+
+    # the Python socket module doesn't know these
+    rds_info_first = 10000
+    rds_info_last = 10017
+
+    nr_success = 0
+    nr_error = 0
+
+    for sock in socks:
+        for optname in range(rds_info_first, rds_info_last + 1):
+            # Sigh, the Python socket module doesn't allow us to pass
+            # buffer lengths greater than 1024 for some reason. RDS
+            # wants multiple pages.
+            try:
+                sock.getsockopt(socket.SOL_RDS, optname, 1024)
+                nr_success = nr_success + 1
+            except OSError as e:
+                nr_error = nr_error + 1
+                if e.errno == errno.ENOSPC:
+                    # ignore
+                    pass
+
+    ksft_pr(f"getsockopt(): {nr_success}/{nr_error}")
+
 def stop_pcaps():
     """Stop tcpdump processes.
 
@@ -268,28 +298,7 @@ while nr_send < NUM_PACKETS:
 
 ksft_pr("done", nr_send, nr_recv)
 
-# the Python socket module doesn't know these
-RDS_INFO_FIRST = 10000
-RDS_INFO_LAST = 10017
-
-nr_success = 0
-nr_error = 0
-
-for s in sockets:
-    for optname in range(RDS_INFO_FIRST, RDS_INFO_LAST + 1):
-        # Sigh, the Python socket module doesn't allow us to pass
-        # buffer lengths greater than 1024 for some reason. RDS
-        # wants multiple pages.
-        try:
-            s.getsockopt(socket.SOL_RDS, optname, 1024)
-            nr_success = nr_success + 1
-        except OSError as e:
-            nr_error = nr_error + 1
-            if e.errno == errno.ENOSPC:
-                # ignore
-                pass
-
-ksft_pr(f"getsockopt(): {nr_success}/{nr_error}")
+check_info(sockets)
 
 # cancel timeout
 signal.alarm(0)