linux-kernel - Re: [RFC PATCH rdma-next 03/10] RDMA/rxe: Allow registering FLUSH flags for supported device only

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Date:   Thu, 13 Jan 2022 06:43:34 +0000
From:   "lizhijian@...itsu.com" <lizhijian@...itsu.com>
To:     "lizhijian@...itsu.com" <lizhijian@...itsu.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "zyjzyj2000@...il.com" <zyjzyj2000@...il.com>,
        "jgg@...pe.ca" <jgg@...pe.ca>,
        "aharonl@...dia.com" <aharonl@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>, Tom Talpey <tom@...pey.com>,
        "Gromadzki, Tomasz" <tomasz.gromadzki@...el.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mbloch@...dia.com" <mbloch@...dia.com>,
        "liangwenpeng@...wei.com" <liangwenpeng@...wei.com>,
        "yangx.jy@...itsu.com" <yangx.jy@...itsu.com>,
        "rpearsonhpe@...il.com" <rpearsonhpe@...il.com>,
        "y-goto@...itsu.com" <y-goto@...itsu.com>
Subject: Re: [RFC PATCH rdma-next 03/10] RDMA/rxe: Allow registering FLUSH
 flags for supported device only

Hey Tom, Tomas, all

I recall that the SPEC says:
> A19.4.3.1 HCA RESOURCES
> This Annex introduces the following new HCA attributes:
> • Ability to support Memory Placement Extensions
> a) Ability to support FLUSH
> i) Ability to support FLUSH with PLT Global Visibility
> ii) Ability to support FLUSH with PLT Persistence

Do you have any idea that can the HCA support just part of the FLUSH capabilities.
For example,  HCA_foo only supports PLT Global Visibility, no PLT Persistence support.

Thanks
Zhijian



On 28/12/2021 16:07, Li Zhijian wrote:
> Device should enable IB_DEVICE_RDMA_FLUSH capability if it want to
> support RDMA FLUSH.
>
> Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com>
> ---
>   include/rdma/ib_verbs.h | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
> index f04d66539879..51d58b641201 100644
> --- a/include/rdma/ib_verbs.h
> +++ b/include/rdma/ib_verbs.h
> @@ -291,6 +291,7 @@ enum ib_device_cap_flags {
>   	/* The device supports padding incoming writes to cacheline. */
>   	IB_DEVICE_PCI_WRITE_END_PADDING		= (1ULL << 36),
>   	IB_DEVICE_ALLOW_USER_UNREG		= (1ULL << 37),
> +	IB_DEVICE_RDMA_FLUSH			= (1ULL << 38),
>   };
>   
>   enum ib_atomic_cap {
> @@ -4319,6 +4320,10 @@ static inline int ib_check_mr_access(struct ib_device *ib_dev,
>   	if (flags & IB_ACCESS_ON_DEMAND &&
>   	    !(ib_dev->attrs.device_cap_flags & IB_DEVICE_ON_DEMAND_PAGING))
>   		return -EINVAL;
> +
> +	if (flags & IB_ACCESS_FLUSH &&
> +	    !(ib_dev->attrs.device_cap_flags & IB_DEVICE_RDMA_FLUSH))
> +		return -EINVAL;
>   	return 0;
>   }
>