!2459 Bugfixes for RDMA/hns

Merge Pull Request from: @stinft 
 
Upload seven bugfixes to fix four issues.
1. Problems related to dca：
  (1) HNS_ROCE_UCTX_RSP_DCA_FLAGS is set only if HNS_ROCE_UCTX_CONFIG_DCA is configured；
  (2) The hr_qp can be a NULL pointer. A check has been added to avoid illegal access.
  (3) DCA debugfs is not needed when DCA is not set for this ucontext.
  (4) When unregistering the device or destroying of ucontext and accessing dca debugfs concurrently, 
      there may be a problem of accessing a null pointer. This patch fixes it by delaying the pointer 
      assignment to null until debugfs has been unregistered.
https://gitee.com/openeuler/kernel/issues/I87LCF

2. Fix printing level of asynchronous events:
   The current driver will print all asynchronous events. Some of the print levels are set improperly, 
   e.g. SRQ limit reach and SRQ last wqe reach, which may also occur during normal operation of the 
   software. Currently, the information of these event is printed as a warning, which causes a large 
   amount of printing even during normal use of the application. As a result, the service performance 
   deteriorates. This patch fixes the printing storms by modifying the print level.
https://gitee.com/openeuler/kernel/issues/I87LIY

3. Fix signed-unsigned mix with relational:
   The ib_mtu_enum_to_int() and uverbs_attr_get_len() may returns a negative value. In this case, 
   mixed comparisons of signed and unsigned types will throw wrong results.
https://gitee.com/openeuler/kernel/issues/I87LLN

4. Fix the concurrency error between bond and reset:
   In the concurrency process between setting bond and reset, when the reset process is finished, the 
   driver detects that bond resource has already been allocated, thus entering the bond recover 
   process, where the bond state is set to HNS_ROCE_BOND_IS_BONDED. But at this point
   the set bond process hasn't been executed yet(i.e. slaves haven't been uninited). This wrong bond 
   state leads to the abnormal reset result that 2 slaves are both registered as bond device.
   Thus delete the bond state setting in bond recover process. Besides, to fix other potential 
   concurrency errors between bond and reset, some improvements are also added:
   (1) For the situation that reset occurs before bond work, add a reset check at the beginning of 
       bond work. If there is an ongoing reset process, re-queue the bond work until the reset is 
       finished.
   (2) For the situation that reset occurs during bond work, add reset checks to bond init/uninit 
       process, treating this situation as an abnormal case.
https://gitee.com/openeuler/kernel/issues/I87LSW

 Chengchang Tang (6):
   RDMA/hns: Fix context dca configuration
   RDMA/hns: Fix potential NULL pointer in DCA memory query
   RDMA/hns: Fix registering dca debugfs when dca has not been set
   RDMA/hns: Fix printing level of asynchronous events
   RDMA/hns: Fix signed-unsigned mix with relational
   RDMA/hns: Fix unregistering device and accessing to debugfs concurrently
 
Junxian Huang (1):
   RDMA/hns: Fix the concurrency error between bond and reset. 
 
Link:https://gitee.com/openeuler/kernel/pulls/2459

 

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