linux-kernel - Re: [PATCH] octeontx2-pf: Add error handling for cn10k_map_unmap_rq

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Message-ID: <Z_NpOu08haGEgqi6@452e0070d9ab>
Date: Mon, 7 Apr 2025 05:57:14 +0000
From: Subbaraya Sundeep <sbhatta@...vell.com>
To: Simon Horman <horms@...nel.org>
CC: Wentao Liang <vulab@...as.ac.cn>,
        Sunil Kovvuri Goutham
	<sgoutham@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>,
        "Hariprasad Kelam" <hkelam@...vell.com>,
        "andrew+netdev@...n.ch"
	<andrew+netdev@...n.ch>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org"
	<kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] octeontx2-pf:  Add error handling for
 cn10k_map_unmap_rq_policer().

On 2025-04-04 at 11:11:38, Simon Horman (horms@...nel.org) wrote:
> On Fri, Apr 04, 2025 at 05:22:16AM +0000, Subbaraya Sundeep Bhatta wrote:
> > Hi,
> > 
> > From: Wentao Liang <vulab@...as.ac.cn> 
> > Sent: Thursday, April 3, 2025 8:43 PM
> > To: Sunil Kovvuri Goutham <sgoutham@...vell.com>; Geethasowjanya Akula <gakula@...vell.com>; Subbaraya Sundeep Bhatta <sbhatta@...vell.com>; Hariprasad Kelam <hkelam@...vell.com>; andrew+netdev@...n.ch; davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com
> > Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Wentao Liang <vulab@...as.ac.cn>
> > Subject: [PATCH] octeontx2-pf: Add error handling for cn10k_map_unmap_rq_policer().
> > 
> > The cn10k_free_matchall_ipolicer() calls the cn10k_map_unmap_rq_policer()
> > for each queue in a for loop without checking for any errors. A proper
> > implementation can be found in cn10k_set_matchall_ipolicer_rate().
> > 
> > Check the return value of the cn10k_map_unmap_rq_policer() function during
> > each loop. Jump to unlock function and return the error code if the
> > funciton fails to unmap policer.
> > 
> > Fixes: 2ca89a2c3752 ("octeontx2-pf: TC_MATCHALL ingress ratelimiting offload")
> > Signed-off-by: Wentao Liang <mailto:vulab@...as.ac.cn>
> > ---
> >  drivers/net/ethernet/marvell/octeontx2/nic/cn10k.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/cn10k.c b/drivers/net/ethernet/marvell/octeontx2/nic/cn10k.c
> > index a15cc86635d6..ce58ad61198e 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/nic/cn10k.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/nic/cn10k.c
> > @@ -353,11 +353,13 @@ int cn10k_free_matchall_ipolicer(struct otx2_nic *pfvf)
> >  
> >  	/* Remove RQ's policer mapping */
> >  	for (qidx = 0; qidx < hw->rx_queues; qidx++)
> > -		cn10k_map_unmap_rq_policer(pfvf, qidx,
> > -					   hw->matchall_ipolicer, false);
> > +		rc = cn10k_map_unmap_rq_policer(pfvf, qidx, hw->matchall_ipolicer, false);
> > +		if (rc)
> > +			goto out;
> >  
> > Intentionally we do not bail out when unmapping one of the queues is failed. The reason is during teardown if one of the queues is failed then
> > we end up not tearing down rest of the queues and those queues cannot be used later which is bad. So leave whatever queues have failed and proceed
> > with tearing down the rest. Hence all we can do is print an error for the failed queue and continue.
> 
> Hi Sundeep,
> 
> Sorry that I didn't notice your response before sending my own to Wentao.
> 
> I do agree that bailing out here is not a good idea.  But I wonder if there
> is any value in the function should propagate some error reporting if any
> call to cn10k_map_unmap_rq_policer fails - e.g. the first failure - while
> still iterating aver all elements.
> 
> Just an idea.
> 
Hi Simon,

We can do but it gets compilcated if more than one queue failed and
reasons are different. Hence just print error and continue.

Thanks,
Sundeep

> > 
> > Thanks,
> > Sundeep
> > 
> >  	rc = cn10k_free_leaf_profile(pfvf, hw->matchall_ipolicer);
> >  
> > +out:
> >  	mutex_unlock(&pfvf->mbox.lock);
> >  	return rc;
> >  }
> > -- 
> > 2.42.0.windows.2
> >