linux-kernel - Re: [PATCH] net: ethernet: ti: am65-cpsw: add sw tx/rx irq coalescing based on hrtimers

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Date:   Thu, 28 Sep 2023 13:57:13 +0200
From:   Simon Horman <horms@...nel.org>
To:     Roger Quadros <rogerq@...nel.org>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, vladimir.oltean@....com, s-vadapalli@...com,
        srk@...com, vigneshr@...com, p-varis@...com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: ti: am65-cpsw: add sw tx/rx irq
 coalescing based on hrtimers

On Fri, Sep 22, 2023 at 03:19:47PM +0300, Roger Quadros wrote:
> From: Grygorii Strashko <grygorii.strashko@...com>
> 
> Add SW IRQ coalescing based on hrtimers for TX and RX data path which
> can be enabled by ethtool commands:
> 
> - RX coalescing
>   ethtool -C eth1 rx-usecs 50
> 
> - TX coalescing can be enabled per TX queue
> 
>   - by default enables coalesing for TX0
>   ethtool -C eth1 tx-usecs 50
>   - configure TX0
>   ethtool -Q eth0 queue_mask 1 --coalesce tx-usecs 100
>   - configure TX1
>   ethtool -Q eth0 queue_mask 2 --coalesce tx-usecs 100
>   - configure TX0 and TX1
>   ethtool -Q eth0 queue_mask 3 --coalesce tx-usecs 100 --coalesce tx-usecs 100
> 
>   show configuration for TX0 and TX1:
>   ethtool -Q eth0 queue_mask 3 --show-coalesce
> 
> Comparing to gro_flush_timeout and napi_defer_hard_irqs, this patch
> allows to enable IRQ coalesing for RX path separately.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> Signed-off-by: Roger Quadros <rogerq@...nel.org>

Reviewed-by: Simon Horman <horms@...nel.org>