On 2024/11/10 22:28, Leon Romanovsky wrote:
> On Thu, Nov 07, 2024 at 02:11:48PM +0800, Junxian Huang wrote:
>> From: Feng Fang <fangfeng4@xxxxxxxxxx>
>>
>> DIP algorithm requires a one-to-one mapping between dgid and dip_idx.
>> Currently a queue 'spare_idx' is used to store QPN of QPs that use
>> DIP algorithm. For a new dgid, use a QPN from spare_idx as dip_idx.
>> This method lacks a mechanism for deduplicating QPN, which may result
>> in different dgids sharing the same dip_idx and break the one-to-one
>> mapping requirement.
>>
>> This patch replaces spare_idx with xarray and introduces a refcnt of
>> a dip_idx to indicate the number of QPs that using this dip_idx.
>>
>> The state machine for dip_idx management is implemented as:
>>
>> * The entry at an index in xarray is empty -- This indicates that the
>> corresponding dip_idx hasn't been created.
>>
>> * The entry at an index in xarray is not empty but with 0 refcnt --
>> This indicates that the corresponding dip_idx has been created but
>> not used as dip_idx yet.
>>
>> * The entry at an index in xarray is not empty and with non-0 refcnt --
>> This indicates that the corresponding dip_idx is being used by refcnt
>> number of DIP QPs.
>>
>> Fixes: eb653eda1e91 ("RDMA/hns: Bugfix for incorrect association between dip_idx and dgid")
>> Fixes: f91696f2f053 ("RDMA/hns: Support congestion control type selection according to the FW")
>> Signed-off-by: Feng Fang <fangfeng4@xxxxxxxxxx>
>> Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
>> ---
>> v1 -> v2:
>> * Use xarray instead of bitmaps as Leon suggested.
>> * v1: https://lore.kernel.org/all/20240906093444.3571619-10-huangjunxian6@xxxxxxxxxxxxx/
>> ---
>> drivers/infiniband/hw/hns/hns_roce_device.h | 11 +--
>> drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 96 +++++++++++++++------
>> drivers/infiniband/hw/hns/hns_roce_hw_v2.h | 2 +-
>> drivers/infiniband/hw/hns/hns_roce_main.c | 2 -
>> drivers/infiniband/hw/hns/hns_roce_qp.c | 7 +-
>> 5 files changed, 74 insertions(+), 44 deletions(-)
>>
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
>> index 9b51d5a1533f..560a1d9de408 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_device.h
>> +++ b/drivers/infiniband/hw/hns/hns_roce_device.h
>> @@ -489,12 +489,6 @@ struct hns_roce_bank {
>> u32 next; /* Next ID to allocate. */
>> };
>>
>> -struct hns_roce_idx_table {
>> - u32 *spare_idx;
>> - u32 head;
>> - u32 tail;
>> -};
>> -
>> struct hns_roce_qp_table {
>> struct hns_roce_hem_table qp_table;
>> struct hns_roce_hem_table irrl_table;
>> @@ -503,7 +497,7 @@ struct hns_roce_qp_table {
>> struct mutex scc_mutex;
>> struct hns_roce_bank bank[HNS_ROCE_QP_BANK_NUM];
>> struct mutex bank_mutex;
>> - struct hns_roce_idx_table idx_table;
>> + struct xarray dip_xa;
>
> I don't see xa_destroy() for this xarray, why?
>
Will add in v3, thanks.
Junxian
> Thanks
