!1671 Backport bugfixes for RDMA/hns from mainline linux

Merge Pull Request from: @stinft 
 
https://gitee.com/openeuler/kernel/issues/I76PRT
https://gitee.com/openeuler/kernel/issues/I76PUJ
https://gitee.com/openeuler/kernel/issues/I76PY9
https://gitee.com/openeuler/kernel/issues/I7R61Q
https://gitee.com/openeuler/kernel/issues/I7RKQ1 
 
Link:https://gitee.com/openeuler/kernel/pulls/1671

 

Reviewed-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>