[PATCH for-next 1/1] RDMA/rxe: Fix the failure of ibv_query_device() and ibv_query_device_ex() tests

[Zhu Yanjun <yanjun.zhu@linux.dev>]

In rdma-core, the following failures appear.

"
$ ./build/bin/run_tests.py -k device
ssssssss....FF........s
======================================================================
FAIL: test_query_device (tests.test_device.DeviceTest.test_query_device)
Test ibv_query_device()
----------------------------------------------------------------------
Traceback (most recent call last):
   File "/home/ubuntu/rdma-core/tests/test_device.py", line 63, in
   test_query_device
     self.verify_device_attr(attr, dev)
   File "/home/ubuntu/rdma-core/tests/test_device.py", line 200, in
   verify_device_attr
     assert attr.sys_image_guid != 0
            ^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

======================================================================
FAIL: test_query_device_ex (tests.test_device.DeviceTest.test_query_device_ex)
Test ibv_query_device_ex()
----------------------------------------------------------------------
Traceback (most recent call last):
   File "/home/ubuntu/rdma-core/tests/test_device.py", line 222, in
   test_query_device_ex
     self.verify_device_attr(attr_ex.orig_attr, dev)
   File "/home/ubuntu/rdma-core/tests/test_device.py", line 200, in
   verify_device_attr
     assert attr.sys_image_guid != 0
            ^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError
"

The root cause is: before a net device is set with rxe, this net device
is used to generate a sys_image_guid.

The solution is from siw commit bad5b6e34ffb ("RDMA/siw: Fabricate
a GID on tun and loopback devices").

Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
---
 drivers/infiniband/sw/rxe/rxe.c | 24 +-----------------------
 1 file changed, 1 insertion(+), 23 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c
index 4e56a371deb5..1ae33f616219 100644
--- a/drivers/infiniband/sw/rxe/rxe.c
+++ b/drivers/infiniband/sw/rxe/rxe.c
@@ -37,8 +37,6 @@ void rxe_dealloc(struct ib_device *ib_dev)
 /* initialize rxe device parameters */
 static void rxe_init_device_param(struct rxe_dev *rxe)
 {
-	struct net_device *ndev;
-
 	rxe->max_inline_data			= RXE_MAX_INLINE_DATA;
 
 	rxe->attr.vendor_id			= RXE_VENDOR_ID;
@@ -71,26 +69,11 @@ static void rxe_init_device_param(struct rxe_dev *rxe)
 	rxe->attr.max_pkeys			= RXE_MAX_PKEYS;
 	rxe->attr.local_ca_ack_delay		= RXE_LOCAL_CA_ACK_DELAY;
 
-	ndev = rxe_ib_device_get_netdev(&rxe->ib_dev);
-	if (!ndev)
-		return;
-
-	if (ndev->addr_len) {
-		memcpy(rxe->raw_gid, ndev->dev_addr,
-			min_t(unsigned int, ndev->addr_len, ETH_ALEN));
-	} else {
-		/*
-		 * This device does not have a HW address, but
-		 * connection mangagement requires a unique gid.
-		 */
-		eth_random_addr(rxe->raw_gid);
-	}
+	eth_random_addr(rxe->raw_gid);
 
 	addrconf_addr_eui48((unsigned char *)&rxe->attr.sys_image_guid,
 			rxe->raw_gid);
 
-	dev_put(ndev);
-
 	rxe->max_ucontext			= RXE_MAX_UCONTEXT;
 
 	if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING)) {
@@ -144,15 +127,10 @@ static void rxe_init_port_param(struct rxe_port *port)
 static void rxe_init_ports(struct rxe_dev *rxe)
 {
 	struct rxe_port *port = &rxe->port;
-	struct net_device *ndev;
 
 	rxe_init_port_param(port);
-	ndev = rxe_ib_device_get_netdev(&rxe->ib_dev);
-	if (!ndev)
-		return;
 	addrconf_addr_eui48((unsigned char *)&port->port_guid,
 			    rxe->raw_gid);
-	dev_put(ndev);
 	spin_lock_init(&port->port_lock);
 }
 
-- 
2.34.1