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

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Message-ID: <20230801131418.bhcjtflj3iu77mmc@skbuf>
Date:   Tue, 1 Aug 2023 16:14:18 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Roger Quadros <rogerq@...nel.org>
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 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....