netdev - Re: [PATCH for-next v3 0/2] Introduce rdma_set_min_rnr

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Date:   Tue, 13 Apr 2021 11:13:38 +0000
From:   Haakon Bugge <haakon.bugge@...cle.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Jason Gunthorpe <jgg@...dia.com>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Doug Ledford <dledford@...hat.com>,
        OFED mailing list <linux-rdma@...r.kernel.org>,
        Parav Pandit <parav@...dia.com>,
        Linux-Net <netdev@...r.kernel.org>,
        "rds-devel@....oracle.com" <rds-devel@....oracle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH for-next v3 0/2] Introduce rdma_set_min_rnr_timer() and
 use it in RDS



> On 13 Apr 2021, at 08:29, Leon Romanovsky <leon@...nel.org> wrote:
> 
> On Mon, Apr 12, 2021 at 07:58:47PM -0300, Jason Gunthorpe wrote:
>> On Wed, Mar 31, 2021 at 08:43:12PM +0200, Håkon Bugge wrote:
>>> ib_modify_qp() is an expensive operation on some HCAs running
>>> virtualized. This series removes two ib_modify_qp() calls from RDS.
>>> 
>>> I am sending this as a v3, even though it is the first sent to
>>> net. This because the IB Core commit has reach v3.
>>> 
>>> Håkon Bugge (2):
>>>  IB/cma: Introduce rdma_set_min_rnr_timer()
>>>  rds: ib: Remove two ib_modify_qp() calls
>> 
>> Applied to rdma for-next, thanks
> 
> Jason,
> 
> It should be 
> +	WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT);

With no return you will arm the setting of the timer and subsequently get an error from the modify_qp later.


Håkon

> 
> and not
> +	if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
> +		return -EINVAL;
> 
> Thanks
> 
>> 
>> Jason