linux-kernel - Re: [PATCH v2 for-next] RDMA/hns: Fix different dgids mapping to the same dip

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Message-ID: <e8230a57-4614-a2df-12fe-80e764d4df27@hisilicon.com>
Date: Mon, 11 Nov 2024 16:47:04 +0800
From: Junxian Huang <huangjunxian6@...ilicon.com>
To: Leon Romanovsky <leon@...nel.org>
CC: <jgg@...pe.ca>, <linux-rdma@...r.kernel.org>, <linuxarm@...wei.com>,
	<linux-kernel@...r.kernel.org>, <tangchengchang@...wei.com>
Subject: Re: [PATCH v2 for-next] RDMA/hns: Fix different dgids mapping to the
 same dip_idx



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@...wei.com>
>>
>> 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@...wei.com>
>> Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
>> ---
>> v1 -> v2:
>> * Use xarray instead of bitmaps as Leon suggested.
>> * v1: https://lore.kernel.org/all/20240906093444.3571619-10-huangjunxian6@hisilicon.com/
>> ---
>>  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