[PATCH] RDMA/srpt: Filter out AGN bits

[Bart Van Assche <bvanassche@acm.org>]

The ib_srpt driver derives its default service GUID from the node GUID
of the first encountered HCA. Since that service GUID is passed to
ib_cm_listen(), the AGN bits must not be set. Since the AGN bits can
be set in the node GUID of RoCE HCAs, filter these bits out. This
patch avoids that loading the ib_srpt driver fails as follows for the
hns driver:

  ib_srpt srpt_add_one(hns_0) failed.

Cc: oulijun <oulijun@huawei.com>
Reported-by: oulijun <oulijun@huawei.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/infiniband/ulp/srpt/ib_srpt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index e25c70a56be6..114bf8d6c82b 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -3109,7 +3109,8 @@ static void srpt_add_one(struct ib_device *device)
 	srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq);
 
 	if (!srpt_service_guid)
-		srpt_service_guid = be64_to_cpu(device->node_guid);
+		srpt_service_guid = be64_to_cpu(device->node_guid) &
+			~IB_SERVICE_ID_AGN_MASK;
 
 	if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND)
 		sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
-- 
2.23.0.rc1.153.gdeed80330f-goog