netdev - Re: [PATCH net v3 3/7] net/rds: Wait for the FRMR_IS_FREE (or FRMR_IS_STALE) transition after posting IB_WR_LOCAL

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Message-ID: <7b2f5433-b289-dc4a-47f9-33df8d5b5503@oracle.com>
Date:   Tue, 16 Jul 2019 17:27:36 -0700
From:   santosh.shilimkar@...cle.com
To:     Gerd Rausch <gerd.rausch@...cle.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com
Cc:     David Miller <davem@...emloft.net>
Subject: Re: [PATCH net v3 3/7] net/rds: Wait for the FRMR_IS_FREE (or
 FRMR_IS_STALE) transition after posting IB_WR_LOCAL_INV

On 7/16/19 3:29 PM, Gerd Rausch wrote:
> In order to:
> 1) avoid a silly bouncing between "clean_list" and "drop_list"
>     triggered by function "rds_ib_reg_frmr" as it is releases frmr
>     regions whose state is not "FRMR_IS_FREE" right away.
> 
> 2) prevent an invalid access error in a race from a pending
>     "IB_WR_LOCAL_INV" operation with a teardown ("dma_unmap_sg", "put_page")
>     and de-registration ("ib_dereg_mr") of the corresponding
>     memory region.
> 
> Signed-off-by: Gerd Rausch <gerd.rausch@...cle.com>
> ---
Thanks for updated version.

Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>