netdev - Re: [PATCH] net-bnx2x: Force link UP when the interface is in LOOPBACK mode

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Date:	Wed, 30 Jan 2013 08:52:53 -0800
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	eilong@...adcom.com
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Yaniv Rosner <yanivr@...adcom.com>
Subject: Re: [PATCH] net-bnx2x: Force link UP when the interface is in
 LOOPBACK mode

On Wed, Jan 30, 2013 at 2:24 AM, Eilon Greenstein <eilong@...adcom.com> wrote:
>
> On Tue, 2013-01-29 at 17:51 -0800, Mahesh Bandewar wrote:
> > When the interface does not have carrier but when it's put into
> > loopback mode (for tests), it does not make sense to not have
> > the carrier. So force it!
> >
>
> Mahesh,
>
> What is the motivation for this change? During the test, the device is
> not really functional and cannot receive traffic to the loopback, so why
> would you like to indicate internally that the link is up?
>
The device is capable of NETIF_F_LOOPBACK so when enabled, it does not
receive traffic from the wire but from the host-side it is functional.
Not having carrier is a problem in that scenario.

> > Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
> > ---
> >  drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
> > index 859df751345e..91af55586bbc 100644
> > --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
> > +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
> > @@ -4748,6 +4748,11 @@ void bnx2x_link_status_update(struct link_params *params,
> >       vars->link_status = REG_RD(bp, params->shmem_base +
> >                                  offsetof(struct shmem_region,
> >                                           port_mb[port].link_status));
> > +
> > +     /* Force link UP in loopback mode */
> > +     if (bp->link_params.loopback_mode != LOOPBACK_NONE)
>
> The LOOPBACK_EXT requires an external loopback so we should not just
> force link up indication for that kind of loopback.
>
Yes, that's true! Let me correct this. I'll add a condition to check
that it's not EXT mode before forcing the link.
> > +             vars->link_status |= LINK_STATUS_LINK_UP;
> > +
> >       if (bnx2x_eee_has_cap(params))
> >               vars->eee_status = REG_RD(bp, params->shmem2_base +
> >                                         offsetof(struct shmem2_region,
>
> Thanks,
> Eilon
>
>
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