Re: [PATCH v2 for-next 8/9] RDMA/hns: Fix non-standard error codes

[Leon Romanovsky <leon@kernel.org>]

On Wed, Nov 06, 2019 at 06:44:06PM +0800, Weihang Li wrote:
>
>
> On 2019/11/6 1:00, Leon Romanovsky wrote:
> > On Tue, Nov 05, 2019 at 07:08:01PM +0800, Weihang Li wrote:
> >> From: Yixian Liu <liuyixian@huawei.com>
> >>
> >> It is better to return a linux error code than define a private constant.
> >>
> >> Signed-off-by: Yixian Liu <liuyixian@huawei.com>
> >> Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
> >> Signed-off-by: Weihang Li <liweihang@hisilicon.com>
> >> ---
> >>  drivers/infiniband/hw/hns/hns_roce_alloc.c |  4 ++--
> >>  drivers/infiniband/hw/hns/hns_roce_cq.c    |  4 ++--
> >>  drivers/infiniband/hw/hns/hns_roce_mr.c    | 15 ++++++++-------
> >>  drivers/infiniband/hw/hns/hns_roce_pd.c    |  2 +-
> >>  drivers/infiniband/hw/hns/hns_roce_srq.c   |  2 +-
> >>  5 files changed, 14 insertions(+), 13 deletions(-)
> >>
> >> diff --git a/drivers/infiniband/hw/hns/hns_roce_alloc.c b/drivers/infiniband/hw/hns/hns_roce_alloc.c
> >> index 8c063c5..da574c2 100644
> >> --- a/drivers/infiniband/hw/hns/hns_roce_alloc.c
> >> +++ b/drivers/infiniband/hw/hns/hns_roce_alloc.c
> >> @@ -55,7 +55,7 @@ int hns_roce_bitmap_alloc(struct hns_roce_bitmap *bitmap, unsigned long *obj)
> >
> > Why do HNS driver have custom bitmap functions instead of include/linux/bitmap.h?
> >
> > Thanks
> >
> > .
> >
>
> Hi Leon,
>
> These custom functions achieved the bitmap working in round-robin fashion.
> When using CM to establish connections, if we allocate a new QP after destroying
> one, we will get the same QP number which will be rejected by IB core.

QP number is controlled by HW (or at least should) and not by this bitmap.

>
> I found related patches about this issue:
> https://git.congatec.com/android/qmx6_kernel/commit/f4ec9e9531ac79ee2521faf7ad3d98978f747e42
> https://patchwork.kernel.org/patch/3306941/
> https://patchwork.kernel.org/patch/9444173/

Irrelevant, those patches try to create and manage object numbers in SW.

Thanks

>
> Thanks,
> Weihang
>