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Subject[PATCH rdma-next 2/5] RDMA/hns: Modify uar allocation algorithm to avoid bitmap exhaust
Date
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;

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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