linux-kernel - Re: [PATCH RFC 1/2] RDMA/rxe: don't allow registering !PAGE

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Date:   Sat, 28 Oct 2023 16:07:23 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Zhu Yanjun <yanjun.zhu@...ux.dev>,
        Li Zhijian <lizhijian@...itsu.com>, zyjzyj2000@...il.com,
        jgg@...pe.ca, leon@...nel.org, linux-rdma@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, rpearsonhpe@...il.com,
        matsuda-daisuke@...itsu.com
Subject: Re: [PATCH RFC 1/2] RDMA/rxe: don't allow registering !PAGE_SIZE mr

On 10/27/23 19:48, Zhu Yanjun wrote:
> In this case, ULP with folio will not work well with current RXE after 
> this commit is applied.

Why not? RDMA ULPs like the SRP initiator driver use ib_map_mr_sg(). The
latter function calls rxe_map_mr_sg() if the RXE driver is used. 
rxe_map_mr_sg() calls ib_sg_to_pages(). ib_sg_to_pages() translates
SG-entries that are larger than a virtual memory page into multiple
entries with size mr->page_size.

Thanks,

Bart.