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Message-ID: <CAH-L+nPAxQHCCA6pwwHMxys4GGnvmvYZKKNzd8AvMxy-hO0eSw@mail.gmail.com>
Date: Tue, 17 Oct 2023 10:01:50 +0530
From: Kalesh Anakkur Purayil <kalesh-anakkur.purayil@...adcom.com>
To: sharmaajay@...uxonhyperv.com
Cc: Long Li <longli@...rosoft.com>, Jason Gunthorpe <jgg@...pe.ca>, 
	Leon Romanovsky <leon@...nel.org>, Dexuan Cui <decui@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, linux-rdma@...r.kernel.org, 
	linux-hyperv@...r.kernel.org, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Ajay Sharma <sharmaajay@...rosoft.com>
Subject: Re: [Patch v7 4/5] RDMA/mana_ib: Query adapter capabilities

Hi Ajay,

One comment in line.

Regards,
Kalesh

On Tue, Oct 17, 2023 at 3:42 AM <sharmaajay@...uxonhyperv.com> wrote:

> From: Ajay Sharma <sharmaajay@...rosoft.com>
>
> Query the adapter capabilities to expose to
> other clients and VF. This checks against
> the user supplied values and protects against
> overflows.
>
> Signed-off-by: Ajay Sharma <sharmaajay@...rosoft.com>
> ---
>  drivers/infiniband/hw/mana/device.c  |  4 ++
>  drivers/infiniband/hw/mana/main.c    | 67 ++++++++++++++++++++++------
>  drivers/infiniband/hw/mana/mana_ib.h | 53 +++++++++++++++++++++-
>  3 files changed, 110 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/infiniband/hw/mana/device.c
> b/drivers/infiniband/hw/mana/device.c
> index 4077e440657a..e15da43c73a0 100644
> --- a/drivers/infiniband/hw/mana/device.c
> +++ b/drivers/infiniband/hw/mana/device.c
> @@ -97,6 +97,10 @@ static int mana_ib_probe(struct auxiliary_device *adev,
>                 goto free_error_eq;
>         }
>
> +       ret = mana_ib_query_adapter_caps(mib_dev);
> +       if (ret)
> +               ibdev_dbg(&mib_dev->ib_dev, "Failed to get caps, use
> defaults");
>
[Kalesh]: You are ignoring the failure here and continuing with the IB
register. When the FW command fails, you won't populate the
"mib_dev->adapter_caps". Subsequent "mana_ib_query_device" may return stale
values?
Is that what you want?

> +
>         ret = ib_register_device(&mib_dev->ib_dev, "mana_%d",
>                                  mdev->gdma_context->dev);
>         if (ret)
> diff --git a/drivers/infiniband/hw/mana/main.c
> b/drivers/infiniband/hw/mana/main.c
> index 5b5d7abe79ac..82923475267d 100644
> --- a/drivers/infiniband/hw/mana/main.c
> +++ b/drivers/infiniband/hw/mana/main.c
> @@ -469,20 +469,15 @@ int mana_ib_get_port_immutable(struct ib_device
> *ibdev, u32 port_num,
>  int mana_ib_query_device(struct ib_device *ibdev, struct ib_device_attr
> *props,
>                          struct ib_udata *uhw)
>  {
> -       props->max_qp = MANA_MAX_NUM_QUEUES;
> -       props->max_qp_wr = MAX_SEND_BUFFERS_PER_QUEUE;
> +       struct mana_ib_dev *mib_dev = container_of(ibdev,
> +                       struct mana_ib_dev, ib_dev);
>
> -       /*
> -        * max_cqe could be potentially much bigger.
> -        * As this version of driver only support RAW QP, set it to the
> same
> -        * value as max_qp_wr
> -        */
> -       props->max_cqe = MAX_SEND_BUFFERS_PER_QUEUE;
> -
> -       props->max_mr_size = MANA_IB_MAX_MR_SIZE;
> -       props->max_mr = MANA_IB_MAX_MR;
> -       props->max_send_sge = MAX_TX_WQE_SGL_ENTRIES;
> -       props->max_recv_sge = MAX_RX_WQE_SGL_ENTRIES;
> +       props->max_qp = mib_dev->adapter_caps.max_qp_count;
> +       props->max_qp_wr = mib_dev->adapter_caps.max_requester_sq_size;
> +       props->max_cqe = mib_dev->adapter_caps.max_requester_sq_size;
> +       props->max_mr = mib_dev->adapter_caps.max_mr_count;
> +       props->max_send_sge = mib_dev->adapter_caps.max_send_wqe_size;
> +       props->max_recv_sge = mib_dev->adapter_caps.max_recv_wqe_size;
>
>         return 0;
>  }
> @@ -601,3 +596,49 @@ int mana_ib_create_error_eq(struct mana_ib_dev
> *mib_dev)
>
>         return 0;
>  }
> +
> +static void assign_caps(struct mana_ib_adapter_caps *caps,
> +                       struct mana_ib_query_adapter_caps_resp *resp)
> +{
> +       caps->max_sq_id = resp->max_sq_id;
> +       caps->max_rq_id = resp->max_rq_id;
> +       caps->max_cq_id = resp->max_cq_id;
> +       caps->max_qp_count = resp->max_qp_count;
> +       caps->max_cq_count = resp->max_cq_count;
> +       caps->max_mr_count = resp->max_mr_count;
> +       caps->max_pd_count = resp->max_pd_count;
> +       caps->max_inbound_read_limit = resp->max_inbound_read_limit;
> +       caps->max_outbound_read_limit = resp->max_outbound_read_limit;
> +       caps->mw_count = resp->mw_count;
> +       caps->max_srq_count = resp->max_srq_count;
> +       caps->max_requester_sq_size = resp->max_requester_sq_size;
> +       caps->max_responder_sq_size = resp->max_responder_sq_size;
> +       caps->max_requester_rq_size = resp->max_requester_rq_size;
> +       caps->max_responder_rq_size = resp->max_responder_rq_size;
> +       caps->max_send_wqe_size = resp->max_send_wqe_size;
> +       caps->max_recv_wqe_size = resp->max_recv_wqe_size;
> +       caps->max_inline_data_size = resp->max_inline_data_size;
> +}
> +
> +int mana_ib_query_adapter_caps(struct mana_ib_dev *mib_dev)
> +{
> +       struct mana_ib_query_adapter_caps_resp resp = {};
> +       struct mana_ib_query_adapter_caps_req req = {};
> +       int err;
> +
> +       mana_gd_init_req_hdr(&req.hdr, MANA_IB_GET_ADAPTER_CAP,
> sizeof(req),
> +                            sizeof(resp));
> +       req.hdr.resp.msg_version = MANA_IB_GET_ADAPTER_CAP_RESPONSE_V3;
> +       req.hdr.dev_id = mib_dev->gc->mana_ib.dev_id;
> +
> +       err = mana_gd_send_request(mib_dev->gc, sizeof(req), &req,
> +                                  sizeof(resp), &resp);
> +
> +       if (err) {
> +               ibdev_err(&mib_dev->ib_dev, "Failed to query adapter caps
> err %d", err);
> +               return err;
> +       }
> +
> +       assign_caps(&mib_dev->adapter_caps, &resp);
> +       return 0;
> +}
> diff --git a/drivers/infiniband/hw/mana/mana_ib.h
> b/drivers/infiniband/hw/mana/mana_ib.h
> index 8a652bccd978..6b9406738cb2 100644
> --- a/drivers/infiniband/hw/mana/mana_ib.h
> +++ b/drivers/infiniband/hw/mana/mana_ib.h
> @@ -20,19 +20,41 @@
>
>  /* MANA doesn't have any limit for MR size */
>  #define MANA_IB_MAX_MR_SIZE    U64_MAX
> -
> +#define MANA_IB_GET_ADAPTER_CAP_RESPONSE_V3 3
>  /*
>   * The hardware limit of number of MRs is greater than maximum number of
> MRs
>   * that can possibly represent in 24 bits
>   */
>  #define MANA_IB_MAX_MR         0xFFFFFFu
>
> +struct mana_ib_adapter_caps {
> +       u32 max_sq_id;
> +       u32 max_rq_id;
> +       u32 max_cq_id;
> +       u32 max_qp_count;
> +       u32 max_cq_count;
> +       u32 max_mr_count;
> +       u32 max_pd_count;
> +       u32 max_inbound_read_limit;
> +       u32 max_outbound_read_limit;
> +       u32 mw_count;
> +       u32 max_srq_count;
> +       u32 max_requester_sq_size;
> +       u32 max_responder_sq_size;
> +       u32 max_requester_rq_size;
> +       u32 max_responder_rq_size;
> +       u32 max_send_wqe_size;
> +       u32 max_recv_wqe_size;
> +       u32 max_inline_data_size;
> +};
> +
>  struct mana_ib_dev {
>         struct ib_device ib_dev;
>         struct gdma_dev *gdma_dev;
>         struct gdma_context *gc;
>         struct gdma_queue *fatal_err_eq;
>         mana_handle_t adapter_handle;
> +       struct mana_ib_adapter_caps adapter_caps;
>  };
>
>  struct mana_ib_wq {
> @@ -96,6 +118,7 @@ struct mana_ib_rwq_ind_table {
>  };
>
>  enum mana_ib_command_code {
> +       MANA_IB_GET_ADAPTER_CAP = 0x30001,
>         MANA_IB_CREATE_ADAPTER  = 0x30002,
>         MANA_IB_DESTROY_ADAPTER = 0x30003,
>  };
> @@ -120,6 +143,32 @@ struct mana_ib_destroy_adapter_resp {
>         struct gdma_resp_hdr hdr;
>  }; /* HW Data */
>
> +struct mana_ib_query_adapter_caps_req {
> +       struct gdma_req_hdr hdr;
> +}; /*HW Data */
> +
> +struct mana_ib_query_adapter_caps_resp {
> +       struct gdma_resp_hdr hdr;
> +       u32 max_sq_id;
> +       u32 max_rq_id;
> +       u32 max_cq_id;
> +       u32 max_qp_count;
> +       u32 max_cq_count;
> +       u32 max_mr_count;
> +       u32 max_pd_count;
> +       u32 max_inbound_read_limit;
> +       u32 max_outbound_read_limit;
> +       u32 mw_count;
> +       u32 max_srq_count;
> +       u32 max_requester_sq_size;
> +       u32 max_responder_sq_size;
> +       u32 max_requester_rq_size;
> +       u32 max_responder_rq_size;
> +       u32 max_send_wqe_size;
> +       u32 max_recv_wqe_size;
> +       u32 max_inline_data_size;
> +}; /* HW Data */
> +
>  int mana_ib_gd_create_dma_region(struct mana_ib_dev *mib_dev,
>                                  struct ib_umem *umem,
>                                  mana_handle_t *gdma_region);
> @@ -194,4 +243,6 @@ int mana_ib_create_adapter(struct mana_ib_dev
> *mib_dev);
>
>  int mana_ib_destroy_adapter(struct mana_ib_dev *mib_dev);
>
> +int mana_ib_query_adapter_caps(struct mana_ib_dev *mib_dev);
> +
>  #endif
> --
> 2.25.1
>
>
>

-- 
Regards,
Kalesh A P

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