netdev - Re: [PATCH] gianfar: fix bug caused by 87c288c6e9aa31720b72e2bc2d665e24e1653c3e

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Date:	Tue, 26 Jul 2011 12:46:00 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	Sebastian Pöhn 
	<sebastian.belden@...glemail.com>
Cc:	Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] gianfar: fix bug caused by
 87c288c6e9aa31720b72e2bc2d665e24e1653c3e

Tue, Jul 26, 2011 at 12:03:13PM CEST, sebastian.belden@...glemail.com wrote:
>commit 87c288c6e9aa31720b72e2bc2d665e24e1653c3e "gianfar: do vlan cleanup" has two issues:
># permutation of rx and tx flags
># enabling vlan tag insertion by default (this leads to unusable connections on some configurations)

How so? What's causing that?

>
>If VLAN insertion is requested (via ethtool) it will be set at an other point ...
>
>Signed-off-by: Sebastian Poehn <sebastian.poehn@...den.com>
>---
>
> drivers/net/gianfar.c |    6 +-----
> 1 files changed, 1 insertions(+), 5 deletions(-)
>
>diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
>index 835cd25..2659daa 100644
>--- a/drivers/net/gianfar.c
>+++ b/drivers/net/gianfar.c
>@@ -388,12 +388,8 @@ static void gfar_init_mac(struct net_device *ndev)
> 	if (priv->hwts_rx_en)
> 		rctrl |= RCTRL_PRSDEP_INIT | RCTRL_TS_ENABLE;
> 
>-	/* keep vlan related bits if it's enabled */
>-	if (ndev->features & NETIF_F_HW_VLAN_TX)
>-		rctrl |= RCTRL_VLEX | RCTRL_PRSDEP_INIT;
>-
> 	if (ndev->features & NETIF_F_HW_VLAN_RX)
>-		tctrl |= TCTRL_VLINS;
>+		rctrl |= RCTRL_VLEX | RCTRL_PRSDEP_INIT;
> 
> 	/* Init rctrl based on our settings */
> 	gfar_write(&regs->rctrl, rctrl);
>
>

If you really need that to be done, you should remove NETIF_F_HW_VLAN_TX
from features (not hw_features) (never add it).

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