[PATCH for-rc 2/6] RDMA/hns: Response dmac to userspace

[Junxian Huang <huangjunxian6@hisilicon.com>]

While creating AH, dmac is already resolved in kernel. Response dmac
to userspace so that userspace doesn't need to resolve dmac repeatedly.

Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
---
 drivers/infiniband/hw/hns/hns_roce_ah.c | 7 +++++++
 include/uapi/rdma/hns-abi.h             | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_ah.c b/drivers/infiniband/hw/hns/hns_roce_ah.c
index 3df032ddda18..e839a83c4b8f 100644
--- a/drivers/infiniband/hw/hns/hns_roce_ah.c
+++ b/drivers/infiniband/hw/hns/hns_roce_ah.c
@@ -57,6 +57,7 @@ int hns_roce_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
 	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
 	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
 	struct hns_roce_dev *hr_dev = to_hr_dev(ibah->device);
+	struct hns_roce_ib_create_ah_resp resp = {};
 	struct hns_roce_ah *ah = to_hr_ah(ibah);
 	int ret = 0;
 	u32 max_sl;
@@ -97,6 +98,12 @@ int hns_roce_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
 		ah->av.vlan_en = ah->av.vlan_id < VLAN_N_VID;
 	}
 
+	if (udata) {
+		memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
+		ret = ib_copy_to_udata(udata, &resp,
+				       min(udata->outlen, sizeof(resp)));
+	}
+
 	return ret;
 }
 
diff --git a/include/uapi/rdma/hns-abi.h b/include/uapi/rdma/hns-abi.h
index ce0f37f83416..c996e151081e 100644
--- a/include/uapi/rdma/hns-abi.h
+++ b/include/uapi/rdma/hns-abi.h
@@ -125,4 +125,9 @@ struct hns_roce_ib_alloc_pd_resp {
 	__u32 pdn;
 };
 
+struct hns_roce_ib_create_ah_resp {
+	__u8 dmac[6];
+	__u8 reserved[2];
+};
+
 #endif /* HNS_ABI_USER_H */
-- 
2.30.0