[PATCH net] net: ti: icssg-prueth: Fix swapped TX stats for MII interfaces.

[PATCH net] net: ti: icssg-prueth: Fix swapped TX stats for MII interfaces.

[Meghana Malladi]

In MII mode, Tx lines are swapped for port0 and port1, which means
Tx port0 receives data from PRU1 and the Tx port1 receives data from
PRU0. This is an expected hardware behavior and reading the Tx stats
needs to be handled accordingly in the driver. Update the driver to
read Tx stats from the PRU1 for port0 and PRU0 for port1.

Fixes: c1e10d5dc7a1 ("net: ti: icssg-prueth: Add ICSSG Stats")
Signed-off-by: Meghana Malladi <m-malladi@ti.com>
---
 drivers/net/ethernet/ti/icssg/icssg_stats.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/ti/icssg/icssg_stats.c b/drivers/net/ethernet/ti/icssg/icssg_stats.c
index 6f0edae38ea2..0b77930b2f08 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_stats.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_stats.c
@@ -29,6 +29,10 @@ void emac_update_hardware_stats(struct prueth_emac *emac)
 	spin_lock(&prueth->stats_lock);
 
 	for (i = 0; i < ARRAY_SIZE(icssg_all_miig_stats); i++) {
+		if (emac->phy_if == PHY_INTERFACE_MODE_MII &&
+		    icssg_all_miig_stats[i].offset >= ICSSG_TX_PACKET_OFFSET &&
+		    icssg_all_miig_stats[i].offset <= ICSSG_TX_BYTE_OFFSET)
+			base = stats_base[slice ^ 1];
 		regmap_read(prueth->miig_rt,
 			    base + icssg_all_miig_stats[i].offset,
 			    &val);

base-commit: 32374234ab0101881e7d0c6a8ef7ebce566c46c9
-- 
2.43.0

Re: [PATCH net] net: ti: icssg-prueth: Fix swapped TX stats for MII interfaces.

[Simon Horman]

On Tue, May 27, 2025 at 05:43:25PM +0530, Meghana Malladi wrote:
> In MII mode, Tx lines are swapped for port0 and port1, which means
> Tx port0 receives data from PRU1 and the Tx port1 receives data from
> PRU0. This is an expected hardware behavior and reading the Tx stats
> needs to be handled accordingly in the driver. Update the driver to
> read Tx stats from the PRU1 for port0 and PRU0 for port1.
> 
> Fixes: c1e10d5dc7a1 ("net: ti: icssg-prueth: Add ICSSG Stats")
> Signed-off-by: Meghana Malladi <m-malladi@ti.com>
> ---
>  drivers/net/ethernet/ti/icssg/icssg_stats.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_stats.c b/drivers/net/ethernet/ti/icssg/icssg_stats.c
> index 6f0edae38ea2..0b77930b2f08 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_stats.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_stats.c
> @@ -29,6 +29,10 @@ void emac_update_hardware_stats(struct prueth_emac *emac)
>  	spin_lock(&prueth->stats_lock);
>  
>  	for (i = 0; i < ARRAY_SIZE(icssg_all_miig_stats); i++) {

Hi Meghana,

Perhaps it would be nice to include a comment here.

> +		if (emac->phy_if == PHY_INTERFACE_MODE_MII &&
> +		    icssg_all_miig_stats[i].offset >= ICSSG_TX_PACKET_OFFSET &&
> +		    icssg_all_miig_stats[i].offset <= ICSSG_TX_BYTE_OFFSET)
> +			base = stats_base[slice ^ 1];
>  		regmap_read(prueth->miig_rt,
>  			    base + icssg_all_miig_stats[i].offset,
>  			    &val);
> 
> base-commit: 32374234ab0101881e7d0c6a8ef7ebce566c46c9
> -- 
> 2.43.0
> 
> 

Re: [PATCH net] net: ti: icssg-prueth: Fix swapped TX stats for MII interfaces.

[Malladi, Meghana]

Hi Simon,

On 5/28/2025 9:42 PM, Simon Horman wrote:
> On Tue, May 27, 2025 at 05:43:25PM +0530, Meghana Malladi wrote:
>> In MII mode, Tx lines are swapped for port0 and port1, which means
>> Tx port0 receives data from PRU1 and the Tx port1 receives data from
>> PRU0. This is an expected hardware behavior and reading the Tx stats
>> needs to be handled accordingly in the driver. Update the driver to
>> read Tx stats from the PRU1 for port0 and PRU0 for port1.
>>
>> Fixes: c1e10d5dc7a1 ("net: ti: icssg-prueth: Add ICSSG Stats")
>> Signed-off-by: Meghana Malladi <m-malladi@ti.com>
>> ---
>>   drivers/net/ethernet/ti/icssg/icssg_stats.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/ti/icssg/icssg_stats.c b/drivers/net/ethernet/ti/icssg/icssg_stats.c
>> index 6f0edae38ea2..0b77930b2f08 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_stats.c
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_stats.c
>> @@ -29,6 +29,10 @@ void emac_update_hardware_stats(struct prueth_emac *emac)
>>   	spin_lock(&prueth->stats_lock);
>>   
>>   	for (i = 0; i < ARRAY_SIZE(icssg_all_miig_stats); i++) {
> 
> Hi Meghana,
> 
> Perhaps it would be nice to include a comment here.
> 

That makes sense, sure will do that.

>> +		if (emac->phy_if == PHY_INTERFACE_MODE_MII &&
>> +		    icssg_all_miig_stats[i].offset >= ICSSG_TX_PACKET_OFFSET &&
>> +		    icssg_all_miig_stats[i].offset <= ICSSG_TX_BYTE_OFFSET)
>> +			base = stats_base[slice ^ 1];
>>   		regmap_read(prueth->miig_rt,
>>   			    base + icssg_all_miig_stats[i].offset,
>>   			    &val);
>>
>> base-commit: 32374234ab0101881e7d0c6a8ef7ebce566c46c9
>> -- 
>> 2.43.0
>>
>>

-- 
Thanks,
Meghana Malladi