IB/hns: Add & initialize "node_guid" parameter for RDMA CM

According to the Infiniband spec, NodeGUID uniquely identifies a
node. This must be initialized to some unique value. This patch
adds the support to the HNS RoCE driver to fetch the NodeGUID
value from DT or ACPI and then use this value to initialize the
node_guid parameter of IB device. This value shall be used by
RDMA CM.

Signed-off-by: Lijun Ou <oulijun@huawei.com>
Reviewed-by: Wei Hu <xavier.huwei@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index ea735800eb18e8c6c5962349aa94152b13d636bf..e943b9864aa24fa13b2b173e342fe4dc84245540 100644 (file)
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -74,6 +74,7 @@
 #define MR_TYPE_DMA                            0x03
 
 #define PKEY_ID                                        0xffff
+#define GUID_LEN                               8
 #define NODE_DESC_SIZE                         64
 
 #define SERV_TYPE_RC                           0

diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
index 39e69c31c5f2586faacf16ce021d842050aeeebe..f0700f4ca2c34265092c66b7c7860d2d14f90549 100644 (file)
--- a/drivers/infiniband/hw/hns/hns_roce_main.c
+++ b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -797,6 +797,15 @@ static int hns_roce_get_cfg(struct hns_roce_dev *hr_dev)
        if (IS_ERR(hr_dev->reg_base))
                return PTR_ERR(hr_dev->reg_base);
 
+       /* read the node_guid of IB device from the DT or ACPI */
+       ret = device_property_read_u8_array(dev, "node-guid",
+                                           (u8 *)&hr_dev->ib_dev.node_guid,
+                                           GUID_LEN);
+       if (ret) {
+               dev_err(dev, "couldn't get node_guid from DT or ACPI!\n");
+               return ret;
+       }
+
        /* get the RoCE associated ethernet ports or netdevices */
        for (i = 0; i < HNS_ROCE_MAX_PORTS; i++) {
                if (dev_of_node(dev)) {