linux-kernel - Re: [EXTERNAL] Re: [PATCH v11 03/10] net: ti: icssg-prueth: Add Firmware config and classification APIs.

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Message-ID: <b2016718-b8e4-a1f8-92ed-f0d9e3cb9c17@ti.com>
Date:   Tue, 25 Jul 2023 13:10:30 +0530
From:   Md Danish Anwar <a0501179@...com>
To:     Simon Horman <simon.horman@...igine.com>,
        MD Danish Anwar <danishanwar@...com>
CC:     Randy Dunlap <rdunlap@...radead.org>,
        Roger Quadros <rogerq@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Andrew Lunn <andrew@...n.ch>,
        Richard Cochran <richardcochran@...il.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>, <nm@...com>, <srk@...com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [EXTERNAL] Re: [PATCH v11 03/10] net: ti: icssg-prueth: Add
 Firmware config and classification APIs.

Hi Simon,

On 25/07/23 12:55 pm, Simon Horman wrote:
> On Mon, Jul 24, 2023 at 04:59:27PM +0530, MD Danish Anwar wrote:
>> Add icssg_config.h / .c and icssg_classifier.c files. These are firmware
>> configuration and classification related files. These will be used by
>> ICSSG ethernet driver.
>>
>> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> 
> Hi Danish,
> 
> some feedback from my side.
> 

Thanks for the feedback.

> ...
> 
>> diff --git a/drivers/net/ethernet/ti/icssg_classifier.c b/drivers/net/ethernet/ti/icssg_classifier.c
> 
> ...
> 
>> +void icssg_class_set_mac_addr(struct regmap *miig_rt, int slice, u8 *mac)
> 
> This function appears to be unused.
> Perhaps it would be better placed in a later patch?
> 
> Or perhaps not, if it makes it hard to split up the patches nicely.
> In which case, perhaps the __maybe_unused annotation could be added,
> temporarily.
> 

Due to splitting the patch into 8-9 patches, I had to introduce these helper
APIs earlier. All these APIs are helper APIs, they will be used in patch 6
(Introduce ICSSG Prueth driver).

I had this concern that some APIs which will be used later but introduced
earlier can create some warnings, before splitting the patches.

I had raised this concern in [1] and asked Jakub if it would be OK to introduce
these APIs earlier. Jakub said it would be fine [2], so I went ahead with this
approach.

It will make very hard to break patches if these APIs are introduced and used
in same patch.

> Flagged by clang-16 W=1, and gcc=12 W=1 builds.
> Likewise for other issues flagged below regarding
> function declarations/definitions.
> 
>> +{
>> +	regmap_write(miig_rt, offs[slice].mac0, (u32)(mac[0] | mac[1] << 8 |
>> +		     mac[2] << 16 | mac[3] << 24));
>> +	regmap_write(miig_rt, offs[slice].mac1, (u32)(mac[4] | mac[5] << 8));
>> +}
>> +
>> +/* disable all RX traffic */
>> +void icssg_class_disable(struct regmap *miig_rt, int slice)
> 
> This function is only used in this file.
> Please consider making it static.
> 

This is later used in icssg_prueth.c, that is why this is not static.

> ...
> 
>> +void icssg_class_default(struct regmap *miig_rt, int slice, bool allmulti)
> 
> This function also appears to be unused.
> 

This is later used in icssg_prueth.c

> ...
> 
>> +/* required for SAV check */
>> +void icssg_ft1_set_mac_addr(struct regmap *miig_rt, int slice, u8 *mac_addr)
> 
> This function also appears to be unused.
> 

This is later used in icssg_prueth.c

> ...
> 
>> diff --git a/drivers/net/ethernet/ti/icssg_config.c b/drivers/net/ethernet/ti/icssg_config.c
> 
> ...
> 
>> +void icssg_config_ipg(struct prueth_emac *emac)
> 
> This function is also only used in this file.
> 

This is later used in icssg_prueth.c

> ...
> 
>> +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.
>> +	 */
>> +	u8 mac[ETH_ALEN] = { 0 };
>> +
>> +	if (prueth->emacs_initialized)
>> +		return;
>> +
>> +	regmap_update_bits(prueth->miig_rt, FDB_GEN_CFG1,
>> +			   SMEM_VLAN_OFFSET_MASK, 0);
>> +	regmap_write(prueth->miig_rt, FDB_GEN_CFG2, 0);
>> +	/* Clear host MAC address */
>> +	icssg_class_set_host_mac_addr(prueth->miig_rt, mac);
> 

This is later used in icssg_prueth.c

> icssg_class_set_host_mac_addr() is defined in icssg_classifier.c
> but used here in icssg_config.c.
> 
> Please consider providing a declaration of this function,
> ideally in a .h file.
> 

The declaration of this function is added later(in patch 6) in icssg_prueth.h

> ...
> 
>> +int emac_set_port_state(struct prueth_emac *emac,
>> +			enum icssg_port_state_cmd cmd)
> 
> This function also appears to be unused.
> 
> ...
> 
>> +void icssg_config_set_speed(struct prueth_emac *emac)
> 
> Ditto.
> 

Both these APIs are later used in icssg_prueth.c

> ...

[1] https://lore.kernel.org/all/17cd1e70-73bc-78d5-7e9d-7b133d6f464b@ti.com/
[2] https://lore.kernel.org/all/20230720081741.0c32d5e6@kernel.org/

-- 
Thanks and Regards,
Danish.