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

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Date:   Mon, 5 Dec 2022 04:46:31 +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: Thursday, December 1, 2022 12:11 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: Re: [EXT] Re: [PATCH net-next v2 2/9] octeon_ep: poll for control
> messages
> 
> On Wed, Nov 30, 2022 at 03:44:30PM +0000, Veerasenareddy Burru wrote:
> >
> >
> > > -----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.
> 
> I don't know if it is acceptable behaviour in netdev, but it doesn't sound right
> to me. What type of control messages will be sent by FW, which PF should
> listen to them?
> 

These messages include periodic keep alive (heartbeat) messages from FW and control messages from VFs.
Every PF will be listening for its own control messages.

Thank you.

> > >
> > > > 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.
> 
> It is applicable to all patches.
> 
> And please fix your email client to properly add blank lines between replies.
> 
> Thanks
> 
> > >
> > > Thanks