linux-kernel - Re: [PATCH net-next v5 3/3] net: ti: icssg-prueth: Add support for ICSSG switch firmware

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Date: Tue, 28 May 2024 00:14:26 +0200
From: Andrew Lunn <andrew@...n.ch>
To: MD Danish Anwar <danishanwar@...com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Simon Horman <horms@...nel.org>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Niklas Schnelle <schnelle@...ux.ibm.com>,
	Arnd Bergmann <arnd@...db.de>, Diogo Ivo <diogo.ivo@...mens.com>,
	Roger Quadros <rogerq@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, srk@...com,
	Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH net-next v5 3/3] net: ti: icssg-prueth: Add support for
 ICSSG switch firmware

On Mon, May 27, 2024 at 10:57:38AM +0530, MD Danish Anwar wrote:
> Add support for ICSSG switch firmware using existing Dual EMAC driver
> with switchdev.
> 
> Limitations:
> VLAN offloading is limited to 0-256 IDs.
> MDB/FDB static entries are limited to 511 entries and different FDBs can
> hash to same bucket and thus may not completely offloaded
> 
> Example assuming ETH1 and ETH2 as ICSSG2 interfaces:
> 
> Switch to ICSSG Switch mode:
>  ip link add name br0 type bridge
>  ip link set dev eth1 master br0
>  ip link set dev eth2 master br0
>  ip link set dev br0 up
>  bridge vlan add dev br0 vid 1 pvid untagged self
> 
> Going back to Dual EMAC mode:
> 
>  ip link set dev br0 down
>  ip link set dev eth1 nomaster
>  ip link set dev eth2 nomaster
>  ip link del name br0 type bridge
> 
> By default, Dual EMAC firmware is loaded, and can be changed to switch
> mode by above steps
> 
> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>  static int prueth_emac_buffer_setup(struct prueth_emac *emac)
>  {
>  	struct icssg_buffer_pool_cfg __iomem *bpool_cfg;
> @@ -321,25 +401,63 @@ static void icssg_init_emac_mode(struct prueth *prueth)
>  	/* When the device is configured as a bridge and it is being brought
>  	 * back to the emac mode, the host mac address has to be set as 0.
>  	 */
> +	u32 addr = prueth->shram.pa + EMAC_ICSSG_SWITCH_DEFAULT_VLAN_TABLE_OFFSET;
> +	int i;
>  	u8 mac[ETH_ALEN] = { 0 };

nitpick: Reverse Christmas tree

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew