linux-kernel - Re: [RFC PATCH] net: ethernet: ti: am65-cpsw-qos: Add Frame Preemption MAC Merge support

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Message-ID: <0f18cf9e-9c5b-02dd-b396-729b9fecdfe7@kernel.org>
Date:   Tue, 1 Aug 2023 16:19:30 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, s-vadapalli@...com, srk@...com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] net: ethernet: ti: am65-cpsw-qos: Add Frame
 Preemption MAC Merge support



On 01/08/2023 16:14, Vladimir Oltean wrote:
> On Tue, Jul 25, 2023 at 10:23:38AM +0300, Roger Quadros wrote:
>> Add driver support for viewing / changing the MAC Merge sublayer
>> parameters and seeing the verification state machine's current state
>> via ethtool.
>>
>> As hardware does not support interrupt notification for verification
>> events we resort to polling on link up. On link up we try a couple of
>> times for verification success and if unsuccessful then give up.
>>
>> The Frame Preemption feature is described in the Technical Reference
>> Manual [1] in section:
>> 	12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
>>
>> Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
>>
>> [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
>> [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
>>
>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>> ---
> 
> Also:
> 
> ../drivers/net/ethernet/ti/am65-cpsw-qos.c:173:6: warning: no previous prototype for function 'am65_cpsw_iet_change_preemptible_tcs' [-Wmissing-prototypes]
> void am65_cpsw_iet_change_preemptible_tcs(struct am65_cpsw_port *port, u8 preemptible_tcs)
>      ^
> ../drivers/net/ethernet/ti/am65-cpsw-qos.c:173:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> void am65_cpsw_iet_change_preemptible_tcs(struct am65_cpsw_port *port, u8 preemptible_tcs)
> ^
> static
> ../drivers/net/ethernet/ti/am65-cpsw-qos.c:179:6: warning: no previous prototype for function 'am65_cpsw_iet_link_state_update' [-Wmissing-prototypes]
> void am65_cpsw_iet_link_state_update(struct net_device *ndev)
>      ^
> ../drivers/net/ethernet/ti/am65-cpsw-qos.c:179:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> void am65_cpsw_iet_link_state_update(struct net_device *ndev)
> ^
> static
> ../drivers/net/ethernet/ti/am65-cpsw-qos.c:699:33: error: redefinition of 'taprio'
>         struct tc_taprio_qopt_offload *taprio = type_data;
>                                        ^
> ../drivers/net/ethernet/ti/am65-cpsw-qos.c:697:33: note: previous definition is here
>         struct tc_taprio_qopt_offload *taprio = type_data;
>                                        ^
> 2 warnings and 1 error generated.
> make[7]: *** [../scripts/Makefile.build:243: drivers/net/ethernet/ti/am65-cpsw-qos.o] Error 1
> make[7]: *** Waiting for unfinished jobs....

I'm pretty sure there weren't any build errors for me.
Did you have and resolve conflicts when applying this patch?

-- 
cheers,
-roger