netdev - Re: [PATCH net-next 05/15] idpf: add create vport and netdev configuration

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Date: Wed, 7 Jun 2023 20:20:57 +0200
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: "Linga, Pavan Kumar" <pavan.kumar.linga@...el.com>, Jakub Kicinski <kuba@...nel.org>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>, davem@...emloft.net, pabeni@...hat.com, 
	edumazet@...gle.com, netdev@...r.kernel.org, emil.s.tantilov@...el.com, 
	jesse.brandeburg@...el.com, sridhar.samudrala@...el.com, 
	shiraz.saleem@...el.com, sindhu.devale@...el.com, willemb@...gle.com, 
	decot@...gle.com, andrew@...n.ch, leon@...nel.org, mst@...hat.com, 
	simon.horman@...igine.com, shannon.nelson@....com, stephen@...workplumber.org, 
	Alan Brady <alan.brady@...el.com>, Joshua Hay <joshua.a.hay@...el.com>, 
	Madhu Chittim <madhu.chittim@...el.com>, Phani Burra <phani.r.burra@...el.com>, 
	Shailendra Bhatnagar <shailendra.bhatnagar@...el.com>, 
	Krishneil Singh <krishneil.k.singh@...el.com>
Subject: Re: [PATCH net-next 05/15] idpf: add create vport and netdev configuration

On Fri, Jun 2, 2023 at 1:48 AM Linga, Pavan Kumar
<pavan.kumar.linga@...el.com> wrote:
>
>
>
> On 5/31/2023 11:22 PM, Jakub Kicinski wrote:
> > On Tue, 30 May 2023 16:44:51 -0700 Tony Nguyen wrote:
> >> @@ -137,8 +210,12 @@ static int idpf_set_msg_pending_bit(struct idpf_adapter *adapter,
> >>       * previous message.
> >>       */
> >>      while (retries) {
> >> -            if (!test_and_set_bit(IDPF_VC_MSG_PENDING, adapter->flags))
> >> +            if ((vport && !test_and_set_bit(IDPF_VPORT_VC_MSG_PENDING,
> >> +                                            vport->flags)) ||
> >> +                (!vport && !test_and_set_bit(IDPF_VC_MSG_PENDING,
> >> +                                             adapter->flags)))
> >>                      break;
> >> +
> >>              msleep(20);
> >>              retries--;
> >>      }
> >
> > Please use locks. Every single Intel driver comes with gazillion flags
> > and endless bugs when the flags go out of sync.
>
> Thanks for the feedback. Will use mutex lock instead of 'VC_MSG_PENDING'
> flag.

Was that the intent of the comment?

Or is it to replace these individual atomic test_and_set bit
operations with a single spinlock-protected critical section around
all the flag operations?

That's how I read the suggestion.