linux-kernel - Re: [PATCH net-next 1/2] net: ti: icssg-prueth: Add Frame Preemption MAC Merge support

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Message-ID: <ac64856a-d283-4f06-b334-f0bb5013a865@linux.dev>
Date: Wed, 7 Jan 2026 16:32:51 +0000
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Meghana Malladi <m-malladi@...com>, horms@...nel.org,
 jacob.e.keller@...el.com, afd@...com, pmohan@...thit.com,
 basharath@...thit.com, vladimir.oltean@....com, rogerq@...nel.org,
 danishanwar@...com, pabeni@...hat.com, kuba@...nel.org, edumazet@...gle.com,
 davem@...emloft.net, andrew+netdev@...n.ch
Cc: 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 1/2] net: ti: icssg-prueth: Add Frame Preemption
 MAC Merge support

On 07/01/2026 12:51, Meghana Malladi wrote:
> This patch adds utility functions to configure firmware to enable
> IET FPE. The highest priority queue is marked as Express queue and
> lower priority queues as pre-emptable, as the default configuration
> which will be overwritten by the mqprio tc mask passed by tc qdisc.
> Driver optionally allow configure the Verify state machine in the
> firmware to check remote peer capability. If remote fails to respond
> to Verify command, then FPE is disabled by firmware and TX FPE active
> status is disabled.
> 
> This also adds the necessary hooks to enable IET/FPE feature in ICSSG
> driver. IET/FPE gets configured when Link is up and gets disabled when link
> goes down or device is stopped.
> 
> Signed-off-by: MD Danish Anwar <danishanwar@...com>
> Signed-off-by: Meghana Malladi <m-malladi@...com>
> ---
>   drivers/net/ethernet/ti/Makefile             |   2 +-
>   drivers/net/ethernet/ti/icssg/icssg_prueth.c |   9 +
>   drivers/net/ethernet/ti/icssg/icssg_prueth.h |   2 +
>   drivers/net/ethernet/ti/icssg/icssg_qos.c    | 319 +++++++++++++++++++
>   drivers/net/ethernet/ti/icssg/icssg_qos.h    |  48 +++
>   5 files changed, 379 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/net/ethernet/ti/icssg/icssg_qos.c
>   create mode 100644 drivers/net/ethernet/ti/icssg/icssg_qos.h
> 
> diff --git a/drivers/net/ethernet/ti/Makefile b/drivers/net/ethernet/ti/Makefile
> index 93c0a4d0e33a..2f588663fdf0 100644
> --- a/drivers/net/ethernet/ti/Makefile
> +++ b/drivers/net/ethernet/ti/Makefile
> @@ -35,7 +35,7 @@ ti-am65-cpsw-nuss-$(CONFIG_TI_K3_AM65_CPSW_SWITCHDEV) += am65-cpsw-switchdev.o
>   obj-$(CONFIG_TI_K3_AM65_CPTS) += am65-cpts.o
>   
>   obj-$(CONFIG_TI_ICSSG_PRUETH) += icssg-prueth.o icssg.o
> -icssg-prueth-y := icssg/icssg_prueth.o icssg/icssg_switchdev.o
> +icssg-prueth-y := icssg/icssg_prueth.o icssg/icssg_switchdev.o icssg/icssg_qos.o
>   
>   obj-$(CONFIG_TI_ICSSG_PRUETH_SR1) += icssg-prueth-sr1.o icssg.o
>   icssg-prueth-sr1-y := icssg/icssg_prueth_sr1.o
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> index f65041662173..668177eba3f8 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> @@ -378,6 +378,12 @@ static void emac_adjust_link(struct net_device *ndev)
>   		} else {
>   			icssg_set_port_state(emac, ICSSG_EMAC_PORT_DISABLE);
>   		}
> +
> +		if (emac->link) {
> +			icssg_qos_link_up(ndev);
> +		} else {
> +			icssg_qos_link_down(ndev);
> +		}

I believe this chunk can be incorporated into if-statement right above

>   	}
>   
>   	if (emac->link) {

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