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Date:	Wed, 9 Apr 2014 15:47:37 +0200
From:	Yegor Yefremov <yegorslists@...glemail.com>
To:	Mugunthan V N <mugunthanvnm@...com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] net: cpsw: fix dual_emac VLAN issue

On Wed, Apr 9, 2014 at 3:09 PM, Mugunthan V N <mugunthanvnm@...com> wrote:
> On Wednesday 09 April 2014 06:23 PM, yegorslists@...glemail.com wrote:
>> From: Yegor Yefremov <yegorslists@...glemail.com>
>>
>> dual_emac mode was first introduced in TI's PSP kernel 3.2.
>> See repository git://arago-project.org/git/projects/linux-am33x.git
>> commit 6afa003a0b06a0376c941436b38204ba2edc4a98.
>>
>> Since commit d9ba8f9e6298af71ec1c1fd3d88c3ef68abd0ec3 dual_emac
>> feature was upstreamed, but with some changes compared to the original
>> source, that led to following behavior:
>>
>> Some stations in LAN don't answer CPSW's ARP request. PSP kernel 3.2
>> could talk to all stations in the same LAN.
>>
>> Use the same cpsw_ale_add_vlan procedure as in PSP kernel 3.2 to fix
>> this regression.
>>
>> Signed-off-by: Yegor Yefremov <yegorslists@...glemail.com>
>> CC: Mugunthan V N <mugunthanvnm@...com>
>> ---
>> Changes:
>>       v2: make more detailed description
>>
>>  drivers/net/ethernet/ti/cpsw.c |    4 +++-
>>  1 files changed, 3 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
>> index 5d5fec6..aa06370 100644
>> --- a/drivers/net/ethernet/ti/cpsw.c
>> +++ b/drivers/net/ethernet/ti/cpsw.c
>> @@ -1040,11 +1040,13 @@ static inline void cpsw_add_dual_emac_def_ale_entries(
>>       else
>>               slave_write(slave, slave->port_vlan, CPSW2_PORT_VLAN);
>>       cpsw_ale_add_vlan(priv->ale, slave->port_vlan, port_mask,
>> -                       port_mask, port_mask, 0);
>> +                       0, port_mask, port_mask);
>
> Dual EMAC VLAN must be untagged on egress and why you need unregistered
> multicast packet to be passed to CPU?
>
>>       cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
>>                          port_mask, ALE_VLAN, slave->port_vlan, 0);
>>       cpsw_ale_add_ucast(priv->ale, priv->mac_addr,
>>               priv->host_port, ALE_VLAN, slave->port_vlan);
>> +     cpsw_ale_add_vlan(priv->ale, 0, ALE_ALL_PORTS << priv->host_port,
>> +             ALE_ALL_PORTS << priv->host_port, priv->host_port, 0);
>
> Vlan ID 0 must not be used, cpsw default vlan id should be used,
> currently 0 is used as default VLAN for internal packet switching, in
> case some one using different default vlan id, then this fix will break.
>
> I have fixed the issue already and submitted a patch.
> http://patchwork.ozlabs.org/patch/337769/

Good to know. I've tested it and I can talk to all stations now. Thanks.

I just compared both drivers (3.2 and upstream) and this was the first
routine, that caught my eye, after implementing it the way 3.2 did, I
got needed features running. But I wasn't sure, if my fix was correct,
that's why I asked for testing and commenting.

Yegor
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