linux-kernel - Re: [PATCH 5/8] NTB: perf: Don't require one more memory window than number of peers

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Date:   Fri, 15 Jun 2018 22:49:40 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-ntb@...glegroups.com,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 5/8] NTB: perf: Don't require one more memory window than
 number of peers

On Fri, Jun 08, 2018 at 06:08:15PM -0600, Logan Gunthorpe <logang@...tatee.com> wrote:
> ntb_perf should not require more than one memory window per peer. This
> was probably an off-by-one error.
> 

Good catch. Thanks. IDT got a lot of MWs especially if LookUpTables are
enabled. That's why I didn't find the effect of this error.

Regards,
-Sergey

> Fixes: 5648e56d03fa ("NTB: ntb_perf: Add full multi-port NTB API support")
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> ---
>  drivers/ntb/test/ntb_perf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
> index 2a9d6b0d1f19..fe27412ffe91 100644
> --- a/drivers/ntb/test/ntb_perf.c
> +++ b/drivers/ntb/test/ntb_perf.c
> @@ -655,7 +655,7 @@ static int perf_init_service(struct perf_ctx *perf)
>  {
>  	u64 mask;
>  
> -	if (ntb_peer_mw_count(perf->ntb) < perf->pcnt + 1) {
> +	if (ntb_peer_mw_count(perf->ntb) < perf->pcnt) {
>  		dev_err(&perf->ntb->dev, "Not enough memory windows\n");
>  		return -EINVAL;
>  	}
> -- 
> 2.11.0
> 
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