netdev - Re: [RFC PATCH] bnx2: use netif_carrier

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Date:	Wed, 12 May 2010 07:09:16 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"'Stanislaw Gruszka'" <sgruszka@...hat.com>
cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Eric Dumazet" <eric.dumazet@...il.com>,
	"Eilon Greenstein" <eilong@...adcom.com>,
	"Vladislav Zolotarov" <vladz@...adcom.com>,
	"Dmitry Kravkov" <dmitry@...adcom.com>,
	"Breno Leitao" <leitao@...ux.vnet.ibm.com>,
	"Matthew Carlson" <mcarlson@...adcom.com>
Subject: Re: [RFC PATCH] bnx2: use netif_carrier_off to prevent tx
 timeout

Stanislaw Gruszka wrote:

> On Wed, 12 May 2010 06:31:52 -0700
> "Michael Chan" <mchan@...adcom.com> wrote:
>
> > > @@ -6346,6 +6338,8 @@ bnx2_vlan_rx_register(struct net_device
> > > *dev, struct vlan_group *vlgrp)
> > >       if (bp->flags & BNX2_FLAG_CAN_KEEP_VLAN)
> > >               bnx2_fw_sync(bp,
> > > BNX2_DRV_MSG_CODE_KEEP_VLAN_UPDATE, 0, 1);
> > >
> > > +     if (bp->link_up)
> > > +             netif_carrier_on(bp->dev);
> >
> > Thanks Stanislaw, I think it is better to turn carrier on in
> > bnx2_netif_start().  We can use the start_cnic parameter to
> > decide if we need to call carrier_on().
>
> IIRC in most cases we set carrier status in bnx2_init_nic()
> (based on what we get from PHY) called before bnx2_netif_start().
> One exception is bnx2_vlan_rx_register() function.
>

Yes, if we reset the chip and reset the PHY, we'll always get a
link up event and we'll set carrier.  We need to take care of
the cases where the chip is not reset or the phy is not reset.
I think it is better if the caller of bnx2_netif_start() does
not have to worry about setting the carrier.

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