netdev - Re: [PATCH 1/1] Tell linkwatch about new interfaces

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Date:	Sat, 11 Apr 2009 11:46:00 -0400
From:	Andrew Lutomirski <amluto@...il.com>
To:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Cc:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] Tell linkwatch about new interfaces

On Thu, Apr 9, 2009 at 8:48 PM, Brandeburg, Jesse
<jesse.brandeburg@...el.com> wrote:
>
> does this patch also fix the issue?

Yes.

2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
state DOWN qlen 1000

Tested-by: Andy Lutomirski <amluto@...il.com>

The link operational states are still funny, though:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
3: wmaster0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
pfifo_fast state UNKNOWN qlen 1000

It looks like all interfaces that don't call netif_carrier_down after
registration end up in UNKNOWN until something happens.  The case of
carrier_on but UNKNOWN doesn't seem to confuse my userspace, but it's
still odd.

--Andy

>
> ===== begin =====
>
> e1000e: indicate link down at load
>
> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
>
> same kind of patch as e1000, let driver explicitly push link state
> once link comes up.
>
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> ---
>
>  drivers/net/e1000e/netdev.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
> index fb78278..6a0411e 100644
> --- a/drivers/net/e1000e/netdev.c
> +++ b/drivers/net/e1000e/netdev.c
> @@ -3072,6 +3072,8 @@ static int e1000_open(struct net_device *netdev)
>        if (test_bit(__E1000_TESTING, &adapter->state))
>                return -EBUSY;
>
> +       netif_carrier_off(netdev);
> +
>        /* allocate transmit descriptors */
>        err = e1000e_setup_tx_resources(adapter);
>        if (err)
> @@ -5006,10 +5008,6 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
>        if (!(adapter->flags & FLAG_HAS_AMT))
>                e1000_get_hw_control(adapter);
>
> -       /* tell the stack to leave us alone until e1000_open() is called */
> -       netif_carrier_off(netdev);
> -       netif_tx_stop_all_queues(netdev);
> -
>        strcpy(netdev->name, "eth%d");
>        err = register_netdev(netdev);
>        if (err)
>
--
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