netdev - Re: [PATCH 2/2] drivers: net:ethernet: cpsw: add support for VLAN

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Message-ID: <20130129072149.GC7663@arwen.pp.htv.fi>
Date:	Tue, 29 Jan 2013 09:21:49 +0200
From:	Felipe Balbi <balbi@...com>
To:	Mugunthan V N <mugunthanvnm@...com>
CC:	<balbi@...com>, <netdev@...r.kernel.org>, <davem@...emloft.net>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH 2/2] drivers: net:ethernet: cpsw: add support for VLAN

Hi,

On Tue, Jan 29, 2013 at 10:35:05AM +0530, Mugunthan V N wrote:
> On 1/29/2013 2:14 AM, Felipe Balbi wrote:
> >On Tue, Jan 29, 2013 at 01:42:25AM +0530, Mugunthan V N wrote:
> >>adding support for VLAN interface for cpsw.
> >>
> >>CPSW VLAN Capability
> >>* Can filter VLAN packets in Hardware
> >>
> >>Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
> >>---
> >>  Documentation/devicetree/bindings/net/cpsw.txt |    2 +
> >>  drivers/net/ethernet/ti/cpsw.c                 |  108 +++++++++++++++++++++++-
> >>  include/linux/platform_data/cpsw.h             |    1 +
> >>  3 files changed, 110 insertions(+), 1 deletion(-)
> >>
> >>diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt
> >>index 6ddd028..99696bf 100644
> >>--- a/Documentation/devicetree/bindings/net/cpsw.txt
> >>+++ b/Documentation/devicetree/bindings/net/cpsw.txt
> >>@@ -24,6 +24,8 @@ Required properties:
> >>  Optional properties:
> >>  - ti,hwmods		: Must be "cpgmac0"
> >>  - no_bd_ram		: Must be 0 or 1
> >>+- default_vlan		: Specifies Default VLAN for non tagged packets
> >>+			  ALE processing
> >>  Note: "ti,hwmods" field is used to fetch the base address and irq
> >>  resources from TI, omap hwmod data base during device registration.
> >>diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> >>index b35e6a7..dee6951 100644
> >>--- a/drivers/net/ethernet/ti/cpsw.c
> >>+++ b/drivers/net/ethernet/ti/cpsw.c
> >>@@ -32,6 +32,7 @@
> >>  #include <linux/of.h>
> >>  #include <linux/of_net.h>
> >>  #include <linux/of_device.h>
> >>+#include <linux/if_vlan.h>
> >>  #include <linux/platform_data/cpsw.h>
> >>@@ -72,6 +73,11 @@ do {								\
> >>  		dev_notice(priv->dev, format, ## __VA_ARGS__);	\
> >>  } while (0)
> >>+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
> >use IS_ENABLED() instead.
> Will change this in next patch version.
> >
> >>+#define VLAN_SUPPORT
> >>+#define CPSW_VLAN_AWARE_MODE
> >>+#endif
> >>+
> >>  #define ALE_ALL_PORTS		0x7
> >>  #define CPSW_MAJOR_VERSION(reg)		(reg >> 8 & 0x7)
> >>@@ -118,6 +124,14 @@ do {								\
> >>  #define TX_PRIORITY_MAPPING	0x33221100
> >>  #define CPDMA_TX_PRIORITY_MAP	0x76543210
> >>+#ifdef CPSW_VLAN_AWARE_MODE
> >>+#define CPSW_VLAN_AWARE		BIT(1)
> >>+#define CPSW_ALE_VLAN_AWARE	1
> >>+#else
> >>+#define CPSW_VLAN_AWARE		0x0
> >>+#define CPSW_ALE_VLAN_AWARE	0
> >>+#endif
> >you should really figure out a way of doing runtime detection for this.
> >Depending on driver recompilation just to enable/disable VLAN support
> >will be quite boring.
> I am not able to find a way to know whether stack is compiled with
> VLAN support or not
> without using VLAN_SUPPORT compiler option. Only way is to hack
> cpsw_ndo_vlan_rx_add_vid
> and know whether stack has VLAN capability or not which is not advisable.

you could use a module parameter or pass data to the driver. In any
case, relying completely on compile-time choices isn't very nice.

-- 
balbi

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