On 3/14/23 7:31 PM, Cheng Xu wrote:
>
>
> On 3/14/23 6:23 PM, Leon Romanovsky wrote:
>> On Tue, Mar 07, 2023 at 06:29:24PM +0800, Cheng Xu wrote:
>>> Doorbell resources are exposed to userspace by mmap. The size unit of mmap
>>> is PAGE_SIZE, previous implementation can not work correctly if PAGE_SIZE
>>> is not 4K. We support non-4K page size in this commit.
>>
>> Why do you need this information in rdma-core?
>> Can you use sysconf(_SC_PAGESIZE) there to understand the page size like
>> other providers?
>>
>
> I don't expose PAGE_SIZE to userspace in this patchset, but the *offset* in
> PAGE of the DBs:
>
> diff --git a/include/uapi/rdma/erdma-abi.h b/include/uapi/rdma/erdma-abi.h
> index b7a0222f978f..57f8942a3c56 100644
> --- a/include/uapi/rdma/erdma-abi.h
> +++ b/include/uapi/rdma/erdma-abi.h
> @@ -40,10 +40,13 @@ struct erdma_uresp_alloc_ctx {
> __u32 dev_id;
> __u32 pad;
> __u32 sdb_type;
> - __u32 sdb_offset;
> + __u32 sdb_entid;
> __aligned_u64 sdb;
> __aligned_u64 rdb;
> __aligned_u64 cdb;
> + __u32 sdb_off;
> + __u32 rdb_off;
> + __u32 cdb_off;
> };
>
> Our doorbell space is aligned to 4096
>
Please ignore these two response. There is something wrong with my Thunderbird:
When I press ctrl + s, it send the email, not save it.
Sorry for this.
Cheng Xu
>
>
>> Thanks
