netdev - Re: [PATCH net-next v3 1/7] octeon_ep: defer probe if firmware not ready

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Message-ID: <Y+zFUUhogjJyp58e@unreal>
Date:   Wed, 15 Feb 2023 13:43:13 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     Veerasenareddy Burru <vburru@...vell.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, aayarekar@...vell.com,
        sedara@...vell.com, 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: [PATCH net-next v3 1/7] octeon_ep: defer probe if firmware not
 ready

On Tue, Feb 14, 2023 at 06:32:05PM +0100, Maciej Fijalkowski wrote:
> On Mon, Feb 13, 2023 at 09:14:16PM -0800, Veerasenareddy Burru wrote:
> > Defer probe if firmware is not ready for device usage.
> > 
> > Signed-off-by: Veerasenareddy Burru <vburru@...vell.com>
> > Signed-off-by: Abhijit Ayarekar <aayarekar@...vell.com>
> > Signed-off-by: Satananda Burla <sburla@...vell.com>
> > ---
> > v2 -> v3:
> >  * fix review comments
> >    https://lore.kernel.org/all/Y4chWyR6qTlptkTE@unreal/
> >    - change get_fw_ready_status() to return bool
> >    - fix the success oriented flow while looking for
> >      PCI extended capability
> >  
> > v1 -> v2:
> >  * was scheduling workqueue task to wait for firmware ready,
> >    to probe/initialize the device.
> >  * now, removed the workqueue task; the probe returns EPROBE_DEFER,
> >    if firmware is not ready.
> >  * removed device status oct->status, as it is not required with the
> >    modified implementation.
> > 
> >  .../ethernet/marvell/octeon_ep/octep_main.c   | 26 +++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> > 
> > diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> > index 5a898fb88e37..5620df4c6d55 100644
> > --- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> > +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> > @@ -1017,6 +1017,26 @@ static void octep_device_cleanup(struct octep_device *oct)
> >  	oct->conf = NULL;
> >  }
> >  
> > +static bool get_fw_ready_status(struct pci_dev *pdev)
> > +{
> > +	u32 pos = 0;
> > +	u16 vsec_id;
> > +	u8 status;
> > +
> > +	while ((pos = pci_find_next_ext_capability(pdev, pos,
> > +						   PCI_EXT_CAP_ID_VNDR))) {
> > +		pci_read_config_word(pdev, pos + 4, &vsec_id);
> > +#define FW_STATUS_VSEC_ID  0xA3
> > +		if (vsec_id != FW_STATUS_VSEC_ID)
> > +			continue;
> > +
> > +		pci_read_config_byte(pdev, (pos + 8), &status);
> > +		dev_info(&pdev->dev, "Firmware ready status = %u\n", status);
> > +		return status ? true : false;
> 
> nit:
> 
> return !!status;

"return status;" is enough, there is no need in "!!".

Thanks