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SubjectRe: [PATCH rdma-next 2/5] RDMA/hns: Modify uar allocation algorithm to avoid bitmap exhaust
On Wed, May 23, 2018 at 02:49:35PM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2018/5/23 14:05, Leon Romanovsky wrote:
> > On Thu, May 17, 2018 at 04:02:50PM +0800, Wei Hu (Xavier) wrote:
> >> This patch modified uar allocation algorithm in hns_roce_uar_alloc
> >> function to avoid bitmap exhaust.
> >>
> >> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
> >> ---
> >> drivers/infiniband/hw/hns/hns_roce_device.h | 1 +
> >> drivers/infiniband/hw/hns/hns_roce_pd.c | 10 ++++++----
> >> 2 files changed, 7 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
> >> index 53c2f1b..412297d4 100644
> >> --- a/drivers/infiniband/hw/hns/hns_roce_device.h
> >> +++ b/drivers/infiniband/hw/hns/hns_roce_device.h
> >> @@ -214,6 +214,7 @@ enum {
> >> struct hns_roce_uar {
> >> u64 pfn;
> >> unsigned long index;
> >> + unsigned long logic_idx;
> >> };
> >>
> >> struct hns_roce_ucontext {
> >> diff --git a/drivers/infiniband/hw/hns/hns_roce_pd.c b/drivers/infiniband/hw/hns/hns_roce_pd.c
> >> index 4b41e04..b9f2c87 100644
> >> --- a/drivers/infiniband/hw/hns/hns_roce_pd.c
> >> +++ b/drivers/infiniband/hw/hns/hns_roce_pd.c
> >> @@ -107,13 +107,15 @@ int hns_roce_uar_alloc(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
> >> int ret = 0;
> >>
> >> /* Using bitmap to manager UAR index */
> >> - ret = hns_roce_bitmap_alloc(&hr_dev->uar_table.bitmap, &uar->index);
> >> + ret = hns_roce_bitmap_alloc(&hr_dev->uar_table.bitmap, &uar->logic_idx);
> >> if (ret == -1)
> >> return -ENOMEM;
> >>
> >> - if (uar->index > 0)
> >> - uar->index = (uar->index - 1) %
> >> + if (uar->logic_idx > 0 && hr_dev->caps.phy_num_uars > 1)
> >> + uar->index = (uar->logic_idx - 1) %
> >> (hr_dev->caps.phy_num_uars - 1) + 1;
> >> + else
> >> + uar->index = 0;
> >>
> > Sorry, but maybe I didn't understand this change fully, but logic_idx is
> > not initialized at all and one of two (needs to check your uar
> > allocation): the logic_idx is always zero -> index will be zero too,
> > or logic_idx is random variable -> index will be random too.
> >
> > What did you want to do?
> >
> Hi, Leon
>
> The prototype of hns_roce_bitmap_alloc as belows:
> int hns_roce_bitmap_alloc(struct hns_roce_bitmap *bitmap,
> unsigned long *obj);
> In this statement, we evaluate uar->logic_idx.
> ret = hns_roce_bitmap_alloc(&hr_dev->uar_table.bitmap,
> &uar->logic_idx);
>
> In hip06, hr_dev->caps.phy_num_uars equals 8,
> if (uar->logic_idx > 0)
> uar-> index = 0;
> else
> uar-> index =(uar->logic_idx - 1) %
> (hr_dev->caps.phy_num_uars - 1) + 1;
> In hip08, hr_dev->caps.phy_num_uars equals 1, uar-> index = 0;
>
> Regards

Where did you change/set logic_idx?

Thanks


> Wei Hu
> >> if (!dev_is_pci(hr_dev->dev)) {
> >> res = platform_get_resource(hr_dev->pdev, IORESOURCE_MEM, 0);
> >> @@ -132,7 +134,7 @@ int hns_roce_uar_alloc(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
> >>
> >> void hns_roce_uar_free(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
> >> {
> >> - hns_roce_bitmap_free(&hr_dev->uar_table.bitmap, uar->index,
> >> + hns_roce_bitmap_free(&hr_dev->uar_table.bitmap, uar->logic_idx,
> >> BITMAP_NO_RR);
> >> }
> >>
> >> --
> >> 1.9.1
> >>
>
>
> --
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