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 10:58:35 +0530
From: MD Danish Anwar <danishanwar@...com>
To: Andrew Lunn <andrew@...n.ch>
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 28/05/24 3:44 am, Andrew Lunn wrote:
> 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>

Thanks for the review. I will change this to "Reverse Christmas tree"
and send next revision.

> 
>     Andrew

-- 
Thanks and Regards,
Danish