linux-kernel - Re: [PATCH rdma-next v2 2/5] RDMA/mana_ib: Create and destroy rnic adapter

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Message-ID: <20240204123013.GE5400@unreal>
Date: Sun, 4 Feb 2024 14:30:13 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Konstantin Taranov <kotaranov@...ux.microsoft.com>
Cc: kotaranov@...rosoft.com, sharmaajay@...rosoft.com, longli@...rosoft.com,
	jgg@...pe.ca, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH rdma-next v2 2/5] RDMA/mana_ib: Create and destroy rnic
 adapter

On Fri, Feb 02, 2024 at 07:06:34AM -0800, Konstantin Taranov wrote:
> This patch adds RNIC creation and destruction.
> If creation of RNIC fails, we support only RAW QPs as they are served by
> ethernet driver.

So please make sure that you are creating RNIC only when you are
supporting it. The idea that some function tries-and-fails with dmesg
errors is not good idea.

Thanks

> 
> Signed-off-by: Konstantin Taranov <kotaranov@...ux.microsoft.com>
> ---
>  drivers/infiniband/hw/mana/main.c    | 31 +++++++++++++++++++++++++++++++
>  drivers/infiniband/hw/mana/mana_ib.h | 29 +++++++++++++++++++++++++++++
>  2 files changed, 60 insertions(+)
> 
> diff --git a/drivers/infiniband/hw/mana/main.c b/drivers/infiniband/hw/mana/main.c
> index c64d569..33cd69e 100644
> --- a/drivers/infiniband/hw/mana/main.c
> +++ b/drivers/infiniband/hw/mana/main.c
> @@ -581,14 +581,31 @@ static void mana_ib_destroy_eqs(struct mana_ib_dev *mdev)
>  
>  void mana_ib_gd_create_rnic_adapter(struct mana_ib_dev *mdev)
>  {
> +	struct mana_rnic_create_adapter_resp resp = {};
> +	struct mana_rnic_create_adapter_req req = {};
> +	struct gdma_context *gc = mdev_to_gc(mdev);
>  	int err;
>  
> +	mdev->adapter_handle = INVALID_MANA_HANDLE;
> +
>  	err = mana_ib_create_eqs(mdev);
>  	if (err) {
>  		ibdev_err(&mdev->ib_dev, "Failed to create EQs for RNIC err %d", err);
>  		goto cleanup;
>  	}
>  
> +	mana_gd_init_req_hdr(&req.hdr, MANA_IB_CREATE_ADAPTER, sizeof(req), sizeof(resp));
> +	req.hdr.req.msg_version = GDMA_MESSAGE_V2;
> +	req.hdr.dev_id = gc->mana_ib.dev_id;
> +	req.notify_eq_id = mdev->fatal_err_eq->id;
> +
> +	err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
> +	if (err) {
> +		ibdev_err(&mdev->ib_dev, "Failed to create RNIC adapter err %d", err);
> +		goto cleanup;
> +	}
> +	mdev->adapter_handle = resp.adapter;
> +
>  	return;
>  
>  cleanup:
> @@ -599,5 +616,19 @@ void mana_ib_gd_create_rnic_adapter(struct mana_ib_dev *mdev)
>  
>  void mana_ib_gd_destroy_rnic_adapter(struct mana_ib_dev *mdev)
>  {
> +	struct mana_rnic_destroy_adapter_resp resp = {};
> +	struct mana_rnic_destroy_adapter_req req = {};
> +	struct gdma_context *gc;
> +
> +	if (!rnic_is_enabled(mdev))
> +		return;
> +
> +	gc = mdev_to_gc(mdev);
> +	mana_gd_init_req_hdr(&req.hdr, MANA_IB_DESTROY_ADAPTER, sizeof(req), sizeof(resp));
> +	req.hdr.dev_id = gc->mana_ib.dev_id;
> +	req.adapter = mdev->adapter_handle;
> +
> +	mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
> +	mdev->adapter_handle = INVALID_MANA_HANDLE;
>  	mana_ib_destroy_eqs(mdev);
>  }
> diff --git a/drivers/infiniband/hw/mana/mana_ib.h b/drivers/infiniband/hw/mana/mana_ib.h
> index a4b94ee..96454cf 100644
> --- a/drivers/infiniband/hw/mana/mana_ib.h
> +++ b/drivers/infiniband/hw/mana/mana_ib.h
> @@ -48,6 +48,7 @@ struct mana_ib_adapter_caps {
>  struct mana_ib_dev {
>  	struct ib_device ib_dev;
>  	struct gdma_dev *gdma_dev;
> +	mana_handle_t adapter_handle;
>  	struct gdma_queue *fatal_err_eq;
>  	struct mana_ib_adapter_caps adapter_caps;
>  };
> @@ -115,6 +116,8 @@ 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,
>  };
>  
>  struct mana_ib_query_adapter_caps_req {
> @@ -143,6 +146,32 @@ struct mana_ib_query_adapter_caps_resp {
>  	u32 max_inline_data_size;
>  }; /* HW Data */
>  
> +struct mana_rnic_create_adapter_req {
> +	struct gdma_req_hdr hdr;
> +	u32 notify_eq_id;
> +	u32 reserved;
> +	u64 feature_flags;
> +}; /*HW Data */
> +
> +struct mana_rnic_create_adapter_resp {
> +	struct gdma_resp_hdr hdr;
> +	mana_handle_t adapter;
> +}; /* HW Data */
> +
> +struct mana_rnic_destroy_adapter_req {
> +	struct gdma_req_hdr hdr;
> +	mana_handle_t adapter;
> +}; /*HW Data */
> +
> +struct mana_rnic_destroy_adapter_resp {
> +	struct gdma_resp_hdr hdr;
> +}; /* HW Data */
> +
> +static inline bool rnic_is_enabled(struct mana_ib_dev *mdev)
> +{
> +	return mdev->adapter_handle != INVALID_MANA_HANDLE;
> +}
> +
>  static inline struct gdma_context *mdev_to_gc(struct mana_ib_dev *mdev)
>  {
>  	return mdev->gdma_dev->gdma_context;
> -- 
> 1.8.3.1
>