Re: [PATCH v2 for-next 2/2] RDMA/hns: Support userspace configuring congestion control algorithm with QP granularity

From: Junxian Huang
Date: Thu Feb 22 2024 - 02:06:45 EST

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In reply to: Jason Gunthorpe: "Re: [PATCH v2 for-next 2/2] RDMA/hns: Support userspace configuring congestion control algorithm with QP granularity"
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On 2024/2/21 23:52, Jason Gunthorpe wrote:
> On Thu, Feb 08, 2024 at 11:50:38AM +0800, Junxian Huang wrote:
>> Support userspace configuring congestion control algorithm with
>> QP granularity. If the algorithm is not specified in userspace,
>> use the default one.
>>
>> Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
>> ---
>> drivers/infiniband/hw/hns/hns_roce_device.h | 23 +++++--
>> drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 14 +---
>> drivers/infiniband/hw/hns/hns_roce_hw_v2.h | 3 +-
>> drivers/infiniband/hw/hns/hns_roce_main.c | 3 +
>> drivers/infiniband/hw/hns/hns_roce_qp.c | 71 +++++++++++++++++++++
>> include/uapi/rdma/hns-abi.h | 17 +++++
>> 6 files changed, 112 insertions(+), 19 deletions(-)
>>
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
>> index c88ba7e053bf..55f2f54e15fb 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_device.h
>> +++ b/drivers/infiniband/hw/hns/hns_roce_device.h
>> @@ -594,11 +594,19 @@ struct hns_roce_work {
>> u32 queue_num;
>> };
>>
>> -enum cong_type {
>> - CONG_TYPE_DCQCN,
>> - CONG_TYPE_LDCP,
>> - CONG_TYPE_HC3,
>> - CONG_TYPE_DIP,
>> +enum hns_roce_scc_algo {
>> + HNS_ROCE_SCC_ALGO_DCQCN = 0,
>> + HNS_ROCE_SCC_ALGO_LDCP,
>> + HNS_ROCE_SCC_ALGO_HC3,
>> + HNS_ROCE_SCC_ALGO_DIP,
>> + HNS_ROCE_SCC_ALGO_TOTAL,
>> +};
>> +
>> +enum hns_roce_cong_type {
>> + CONG_TYPE_DCQCN = 1 << HNS_ROCE_SCC_ALGO_DCQCN,
>> + CONG_TYPE_LDCP = 1 << HNS_ROCE_SCC_ALGO_LDCP,
>> + CONG_TYPE_HC3 = 1 << HNS_ROCE_SCC_ALGO_HC3,
>> + CONG_TYPE_DIP = 1 << HNS_ROCE_SCC_ALGO_DIP,
>> };
>>
>> struct hns_roce_qp {
>> @@ -644,7 +652,7 @@ struct hns_roce_qp {
>> struct list_head sq_node; /* all send qps are on a list */
>> struct hns_user_mmap_entry *dwqe_mmap_entry;
>> u32 config;
>> - enum cong_type cong_type;
>> + enum hns_roce_cong_type cong_type;
>> };
>>
>> struct hns_roce_ib_iboe {
>> @@ -845,7 +853,8 @@ struct hns_roce_caps {
>> u16 default_aeq_period;
>> u16 default_aeq_arm_st;
>> u16 default_ceq_arm_st;
>> - enum cong_type cong_type;
>> + u8 cong_cap;
>> + enum hns_roce_cong_type default_cong_type;
>> };
>>
>> enum hns_roce_device_state {
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> index 42e28586cefa..21532f213b0f 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> @@ -2209,11 +2209,12 @@ static int hns_roce_query_caps(struct hns_roce_dev *hr_dev)
>> caps->max_wqes = 1 << le16_to_cpu(resp_c->sq_depth);
>>
>> caps->num_srqs = 1 << hr_reg_read(resp_d, PF_CAPS_D_NUM_SRQS);
>> - caps->cong_type = hr_reg_read(resp_d, PF_CAPS_D_CONG_TYPE);
>> + caps->cong_cap = hr_reg_read(resp_d, PF_CAPS_D_CONG_CAP);
>> caps->max_srq_wrs = 1 << le16_to_cpu(resp_d->srq_depth);
>> caps->ceqe_depth = 1 << hr_reg_read(resp_d, PF_CAPS_D_CEQ_DEPTH);
>> caps->num_comp_vectors = hr_reg_read(resp_d, PF_CAPS_D_NUM_CEQS);
>> caps->aeqe_depth = 1 << hr_reg_read(resp_d, PF_CAPS_D_AEQ_DEPTH);
>> + caps->default_cong_type = hr_reg_read(resp_d, PF_CAPS_D_DEFAULT_ALG);
>> caps->reserved_pds = hr_reg_read(resp_d, PF_CAPS_D_RSV_PDS);
>> caps->num_uars = 1 << hr_reg_read(resp_d, PF_CAPS_D_NUM_UARS);
>> caps->reserved_qps = hr_reg_read(resp_d, PF_CAPS_D_RSV_QPS);
>> @@ -4737,14 +4738,8 @@ enum {
>> static int check_cong_type(struct ib_qp *ibqp,
>> struct hns_roce_congestion_algorithm *cong_alg)
>> {
>> - struct hns_roce_dev *hr_dev = to_hr_dev(ibqp->device);
>> struct hns_roce_qp *hr_qp = to_hr_qp(ibqp);
>>
>> - if (ibqp->qp_type == IB_QPT_UD || ibqp->qp_type == IB_QPT_GSI)
>> - hr_qp->cong_type = CONG_TYPE_DCQCN;
>> - else
>> - hr_qp->cong_type = hr_dev->caps.cong_type;
>> -
>> /* different congestion types match different configurations */
>> switch (hr_qp->cong_type) {
>> case CONG_TYPE_DCQCN:
>> @@ -4772,9 +4767,6 @@ static int check_cong_type(struct ib_qp *ibqp,
>> cong_alg->wnd_mode_sel = WND_LIMIT;
>> break;
>> default:
>> - ibdev_warn(&hr_dev->ib_dev,
>> - "invalid type(%u) for congestion selection.\n",
>> - hr_qp->cong_type);
>> hr_qp->cong_type = CONG_TYPE_DCQCN;
>> cong_alg->alg_sel = CONG_DCQCN;
>> cong_alg->alg_sub_sel = UNSUPPORT_CONG_LEVEL;
>> @@ -4807,7 +4799,7 @@ static int fill_cong_field(struct ib_qp *ibqp, const struct ib_qp_attr *attr,
>> return ret;
>>
>> hr_reg_write(context, QPC_CONG_ALGO_TMPL_ID, hr_dev->cong_algo_tmpl_id +
>> - hr_qp->cong_type * HNS_ROCE_CONG_SIZE);
>> + ilog2(hr_qp->cong_type) * HNS_ROCE_CONG_SIZE);
>> hr_reg_clear(qpc_mask, QPC_CONG_ALGO_TMPL_ID);
>> hr_reg_write(&context->ext, QPCEX_CONG_ALG_SEL, cong_field.alg_sel);
>> hr_reg_clear(&qpc_mask->ext, QPCEX_CONG_ALG_SEL);
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.h b/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
>> index cd97cbee682a..359a74672ba1 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
>> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
>> @@ -1214,12 +1214,13 @@ struct hns_roce_query_pf_caps_d {
>> #define PF_CAPS_D_RQWQE_HOP_NUM PF_CAPS_D_FIELD_LOC(21, 20)
>> #define PF_CAPS_D_EX_SGE_HOP_NUM PF_CAPS_D_FIELD_LOC(23, 22)
>> #define PF_CAPS_D_SQWQE_HOP_NUM PF_CAPS_D_FIELD_LOC(25, 24)
>> -#define PF_CAPS_D_CONG_TYPE PF_CAPS_D_FIELD_LOC(29, 26)
>> +#define PF_CAPS_D_CONG_CAP PF_CAPS_D_FIELD_LOC(29, 26)
>> #define PF_CAPS_D_CEQ_DEPTH PF_CAPS_D_FIELD_LOC(85, 64)
>> #define PF_CAPS_D_NUM_CEQS PF_CAPS_D_FIELD_LOC(95, 86)
>> #define PF_CAPS_D_AEQ_DEPTH PF_CAPS_D_FIELD_LOC(117, 96)
>> #define PF_CAPS_D_AEQ_ARM_ST PF_CAPS_D_FIELD_LOC(119, 118)
>> #define PF_CAPS_D_CEQ_ARM_ST PF_CAPS_D_FIELD_LOC(121, 120)
>> +#define PF_CAPS_D_DEFAULT_ALG PF_CAPS_D_FIELD_LOC(127, 122)
>> #define PF_CAPS_D_RSV_PDS PF_CAPS_D_FIELD_LOC(147, 128)
>> #define PF_CAPS_D_NUM_UARS PF_CAPS_D_FIELD_LOC(155, 148)
>> #define PF_CAPS_D_RSV_QPS PF_CAPS_D_FIELD_LOC(179, 160)
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
>> index b55fe6911f9f..e5b678814f58 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_main.c
>> +++ b/drivers/infiniband/hw/hns/hns_roce_main.c
>> @@ -394,6 +394,9 @@ static int hns_roce_alloc_ucontext(struct ib_ucontext *uctx,
>> resp.config |= HNS_ROCE_RSP_CQE_INLINE_FLAGS;
>> }
>>
>> + if (hr_dev->pci_dev->revision >= PCI_REVISION_ID_HIP09)
>> + resp.congest_type = hr_dev->caps.cong_cap;
>> +
>> ret = hns_roce_uar_alloc(hr_dev, &context->uar);
>> if (ret)
>> goto error_out;
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_qp.c b/drivers/infiniband/hw/hns/hns_roce_qp.c
>> index 31b147210688..e22911d6b6a9 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_qp.c
>> +++ b/drivers/infiniband/hw/hns/hns_roce_qp.c
>> @@ -1004,6 +1004,70 @@ static void free_kernel_wrid(struct hns_roce_qp *hr_qp)
>> kfree(hr_qp->sq.wrid);
>> }
>>
>> +static void default_congest_type(struct hns_roce_dev *hr_dev,
>> + struct hns_roce_qp *hr_qp)
>> +{
>> + struct hns_roce_caps *caps = &hr_dev->caps;
>> +
>> + if (hr_qp->ibqp.qp_type == IB_QPT_UD ||
>> + hr_qp->ibqp.qp_type == IB_QPT_GSI)
>> + hr_qp->cong_type = CONG_TYPE_DCQCN;
>> + else
>> + hr_qp->cong_type = 1 << caps->default_cong_type;
>> +}
>> +
>> +static int set_congest_type(struct hns_roce_qp *hr_qp,
>> + struct hns_roce_ib_create_qp *ucmd)
>> +{
>> + struct hns_roce_dev *hr_dev = to_hr_dev(hr_qp->ibqp.device);
>> +
>> + switch (ucmd->cong_type_flags) {
>> + case HNS_ROCE_CREATE_QP_FLAGS_DCQCN:
>> + hr_qp->cong_type = CONG_TYPE_DCQCN;
>> + break;
>> + case HNS_ROCE_CREATE_QP_FLAGS_LDCP:
>> + hr_qp->cong_type = CONG_TYPE_LDCP;
>> + break;
>> + case HNS_ROCE_CREATE_QP_FLAGS_HC3:
>> + hr_qp->cong_type = CONG_TYPE_HC3;
>> + break;
>> + case HNS_ROCE_CREATE_QP_FLAGS_DIP:
>> + hr_qp->cong_type = CONG_TYPE_DIP;
>> + break;
>> + default:
>> + hr_qp->cong_type = 0;
>> + }
>> +
>> + if (!(hr_qp->cong_type & hr_dev->caps.cong_cap)) {
>> + ibdev_err_ratelimited(&hr_dev->ib_dev,
>> + "Unsupported congest type 0x%x, cong_cap = 0x%x.\n",
>> + hr_qp->cong_type, hr_dev->caps.cong_cap);
>> + return -EOPNOTSUPP;
>> + }
>> +
>> + if (hr_qp->ibqp.qp_type == IB_QPT_UD &&
>> + !(hr_qp->cong_type & CONG_TYPE_DCQCN)) {
>> + ibdev_err_ratelimited(&hr_dev->ib_dev,
>> + "Only DCQCN supported for UD. Unsupported congest type 0x%x.\n",
>> + hr_qp->cong_type);
>
> Do not print kernel messages triggered by bad userspace input.
>
> Jason
>

OK. Will remove these printing in next version.

>> + return -EOPNOTSUPP;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int set_congest_param(struct hns_roce_dev *hr_dev,
>> + struct hns_roce_qp *hr_qp,
>> + struct hns_roce_ib_create_qp *ucmd)
>> +{
>> + if (ucmd->comp_mask & HNS_ROCE_CREATE_QP_MASK_CONGEST_TYPE)
>> + return set_congest_type(hr_qp, ucmd);
>> +
>> + default_congest_type(hr_dev, hr_qp);
>> +
>> + return 0;
>> +}
>> +
>> static int set_qp_param(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp,
>> struct ib_qp_init_attr *init_attr,
>> struct ib_udata *udata,
>> @@ -1026,6 +1090,9 @@ static int set_qp_param(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp,
>> return ret;
>> }
>>
>> + if (init_attr->qp_type == IB_QPT_XRC_TGT)
>> + default_congest_type(hr_dev, hr_qp);
>> +
>> if (udata) {
>> ret = ib_copy_from_udata(ucmd, udata,
>> min(udata->inlen, sizeof(*ucmd)));
>> @@ -1043,6 +1110,10 @@ static int set_qp_param(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp,
>> ibdev_err(ibdev,
>> "failed to set user SQ size, ret = %d.\n",
>> ret);
>> +
>> + ret = set_congest_param(hr_dev, hr_qp, ucmd);
>> + if (ret)
>> + return ret;
>> } else {
>> if (hr_dev->pci_dev->revision >= PCI_REVISION_ID_HIP09)
>> hr_qp->config = HNS_ROCE_EXSGE_FLAGS;
>> diff --git a/include/uapi/rdma/hns-abi.h b/include/uapi/rdma/hns-abi.h
>> index c996e151081e..757095a6c6fc 100644
>> --- a/include/uapi/rdma/hns-abi.h
>> +++ b/include/uapi/rdma/hns-abi.h
>> @@ -81,6 +81,9 @@ struct hns_roce_ib_create_qp {
>> __u8 sq_no_prefetch;
>> __u8 reserved[5];
>> __aligned_u64 sdb_addr;
>> + __aligned_u64 comp_mask; /* Use enum hns_roce_create_qp_comp_mask */
>> + __aligned_u64 create_flags;
>> + __aligned_u64 cong_type_flags;
>> };
>>
>> enum hns_roce_qp_cap_flags {
>> @@ -107,6 +110,17 @@ enum {
>> HNS_ROCE_RSP_CQE_INLINE_FLAGS = 1 << 2,
>> };
>>
>> +enum hns_roce_congest_type_flags {
>> + HNS_ROCE_CREATE_QP_FLAGS_DCQCN = 1 << 0,
>> + HNS_ROCE_CREATE_QP_FLAGS_LDCP = 1 << 1,
>> + HNS_ROCE_CREATE_QP_FLAGS_HC3 = 1 << 2,
>> + HNS_ROCE_CREATE_QP_FLAGS_DIP = 1 << 3,
>> +};
>
> Why are these bit flags if they are exclusive?
>

Our FW uses bit flags. Although there is no direct relationship between
FW and ABI, but from the perspective of readability, bit flags are also
used consistently here in ABI.

>> +
>> +enum hns_roce_create_qp_comp_mask {
>> + HNS_ROCE_CREATE_QP_MASK_CONGEST_TYPE = 1 << 1,
>
> Why 1<<1 not 1<<0?

This is to keep consistent with our internal ABI, there are some
features not upstream yet.

>
> These are in the wrong order in the file too, they should be before
> their first "use", ie move above struct hns_roce_ib_create_qp
>

OK.

>> @@ -114,6 +128,9 @@ struct hns_roce_ib_alloc_ucontext_resp {
>> __u32 reserved;
>> __u32 config;
>> __u32 max_inline_data;
>> + __u8 reserved0;
>> + __u8 congest_type;
>
> Why this layout?
> > Jason

Same as the 1<<1 issue, to keep consistent with our internal ABI.

Thanks,
Junxian

Next message: Baoquan He: "Re: [PATCH v2 00/14] Split crash out from kexec and clean up related config items"
Previous message: Barry Song: "Re: [PATCH v3 4/4] mm: swap: Swap-out small-sized THP without splitting"
In reply to: Jason Gunthorpe: "Re: [PATCH v2 for-next 2/2] RDMA/hns: Support userspace configuring congestion control algorithm with QP granularity"
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