linux-kernel - RE: [EXT] Re: [PATCH net-next v2 2/9] octeon

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Message-ID: <BYAPR18MB242397C352B0086140106A46CC159@BYAPR18MB2423.namprd18.prod.outlook.com>
Date:   Wed, 30 Nov 2022 15:44:30 +0000
From:   Veerasenareddy Burru <vburru@...vell.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Liron Himi <lironh@...vell.com>,
        Abhijit Ayarekar <aayarekar@...vell.com>,
        Sathesh B Edara <sedara@...vell.com>,
        Satananda Burla <sburla@...vell.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: RE: [EXT] Re: [PATCH net-next v2 2/9] octeon_ep: poll for control
 messages



> -----Original Message-----
> From: Leon Romanovsky <leon@...nel.org>
> Sent: Wednesday, November 30, 2022 1:30 AM
> To: Veerasenareddy Burru <vburru@...vell.com>
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Liron Himi
> <lironh@...vell.com>; Abhijit Ayarekar <aayarekar@...vell.com>; Sathesh
> B Edara <sedara@...vell.com>; Satananda Burla <sburla@...vell.com>;
> linux-doc@...r.kernel.org; David S. Miller <davem@...emloft.net>; Eric
> Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>;
> Paolo Abeni <pabeni@...hat.com>
> Subject: [EXT] Re: [PATCH net-next v2 2/9] octeon_ep: poll for control
> messages
> 
> External Email
> 
> ----------------------------------------------------------------------
> On Tue, Nov 29, 2022 at 05:09:25AM -0800, Veerasenareddy Burru wrote:
> > Poll for control messages until interrupts are enabled.
> > All the interrupts are enabled in ndo_open().
> 
> So what are you saying if I have your device and didn't enable network
> device, you will poll forever?
Yes, Leon. It will poll periodically until network interface is enabled.
> 
> > Add ability to listen for notifications from firmware before ndo_open().
> > Once interrupts are enabled, this polling is disabled and all the
> > messages are processed by bottom half of interrupt handler.
> >
> > Signed-off-by: Veerasenareddy Burru <vburru@...vell.com>
> > Signed-off-by: Abhijit Ayarekar <aayarekar@...vell.com>
> > ---
> > v1 -> v2:
> >  * removed device status oct->status, as it is not required with the
> >    modified implementation in 0001-xxxx.patch
> >
> >  .../marvell/octeon_ep/octep_cn9k_pf.c         | 49 +++++++++----------
> >  .../ethernet/marvell/octeon_ep/octep_main.c   | 35 +++++++++++++
> >  .../ethernet/marvell/octeon_ep/octep_main.h   | 11 ++++-
> >  .../marvell/octeon_ep/octep_regs_cn9k_pf.h    |  4 ++
> >  4 files changed, 71 insertions(+), 28 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> > b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> > index 6ad88d0fe43f..ace2dfd1e918 100644
> > --- a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> > +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> > @@ -352,27 +352,36 @@ static void
> octep_setup_mbox_regs_cn93_pf(struct octep_device *oct, int q_no)
> >  	mbox->mbox_read_reg = oct->mmio[0].hw_addr +
> > CN93_SDP_R_MBOX_VF_PF_DATA(q_no);  }
> >
> > -/* Mailbox Interrupt handler */
> > -static void cn93_handle_pf_mbox_intr(struct octep_device *oct)
> > +/* Process non-ioq interrupts required to keep pf interface running.
> > + * OEI_RINT is needed for control mailbox  */ static int
> > +octep_poll_non_ioq_interrupts_cn93_pf(struct octep_device *oct)
> >  {
> > -	u64 mbox_int_val = 0ULL, val = 0ULL, qno = 0ULL;
> > +	u64 reg0;
> > +	int handled = 0;
> 
> Reversed Christmas tree.
Thanks for the feedback. Will revise the patch.
> 
> Thanks