linux-kernel - RE: [PATCH rdma-next 2/2] RDMA/mana

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Date: Tue, 28 May 2024 20:14:22 +0000
From: Long Li <longli@...rosoft.com>
To: Konstantin Taranov <kotaranov@...ux.microsoft.com>, Konstantin Taranov
	<kotaranov@...rosoft.com>, "sharmaajay@...rosoft.com"
	<sharmaajay@...rosoft.com>, "jgg@...pe.ca" <jgg@...pe.ca>, "leon@...nel.org"
	<leon@...nel.org>
CC: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH rdma-next 2/2] RDMA/mana_ib: extend query device

> Subject: [PATCH rdma-next 2/2] RDMA/mana_ib: extend query device
> 
> From: Konstantin Taranov <kotaranov@...rosoft.com>
> 
> Fill in properties of the ib device.
> Order the assignment in the order of fields in the struct ib_device_attr.
> 
> Signed-off-by: Konstantin Taranov <kotaranov@...rosoft.com>
> ---
>  drivers/infiniband/hw/mana/main.c    | 19 ++++++++++++++++---
>  drivers/infiniband/hw/mana/mana_ib.h |  5 +++++
>  2 files changed, 21 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mana/main.c
> b/drivers/infiniband/hw/mana/main.c
> index 2a41135..814a61e 100644
> --- a/drivers/infiniband/hw/mana/main.c
> +++ b/drivers/infiniband/hw/mana/main.c
> @@ -547,14 +547,27 @@ int mana_ib_query_device(struct ib_device *ibdev,
> struct ib_device_attr *props,
>  	struct mana_ib_dev *dev = container_of(ibdev,
>  			struct mana_ib_dev, ib_dev);
> 
> +	memset(props, 0, sizeof(*props));
> +	props->max_mr_size = MANA_IB_MAX_MR_SIZE;
> +	props->page_size_cap = PAGE_SZ_BM;
>  	props->max_qp = dev->adapter_caps.max_qp_count;
>  	props->max_qp_wr = dev->adapter_caps.max_qp_wr;
> +	props->device_cap_flags = IB_DEVICE_RC_RNR_NAK_GEN;
> +	props->max_send_sge = dev->adapter_caps.max_send_sge_count;
> +	props->max_recv_sge = dev->adapter_caps.max_recv_sge_count;
> +	props->max_sge_rd = dev->adapter_caps.max_recv_sge_count;
>  	props->max_cq = dev->adapter_caps.max_cq_count;
>  	props->max_cqe = dev->adapter_caps.max_qp_wr;
>  	props->max_mr = dev->adapter_caps.max_mr_count;
> -	props->max_mr_size = MANA_IB_MAX_MR_SIZE;
> -	props->max_send_sge = dev->adapter_caps.max_send_sge_count;
> -	props->max_recv_sge = dev->adapter_caps.max_recv_sge_count;
> +	props->max_pd = dev->adapter_caps.max_pd_count;
> +	props->max_qp_rd_atom = dev->adapter_caps.max_inbound_read_limit;
> +	props->max_res_rd_atom = props->max_qp_rd_atom * props->max_qp;
> +	props->max_qp_init_rd_atom = dev-
> >adapter_caps.max_outbound_read_limit;
> +	props->atomic_cap = IB_ATOMIC_NONE;
> +	props->masked_atomic_cap = IB_ATOMIC_NONE;
> +	props->max_ah = INT_MAX;
> +	props->max_pkeys = 1;
> +	props->local_ca_ack_delay = MANA_CA_ACK_DELAY;
> 
>  	return 0;
>  }
> diff --git a/drivers/infiniband/hw/mana/mana_ib.h
> b/drivers/infiniband/hw/mana/mana_ib.h
> index 68c3b4f..1348bfb 100644
> --- a/drivers/infiniband/hw/mana/mana_ib.h
> +++ b/drivers/infiniband/hw/mana/mana_ib.h
> @@ -27,6 +27,11 @@
>   */
>  #define MANA_IB_MAX_MR		0xFFFFFFu
> 
> +/*
> + * The CA timeout is approx. 260ms
> + */
> +#define MANA_CA_ACK_DELAY	16

Looks good. But can you add a comment on where 16 is coming from 260ms?