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SubjectRe: [RFC PATCH rdma-next 03/10] RDMA/rxe: Allow registering FLUSH flags for supported device only
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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@cn.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;
> }
>
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