linux-kernel - Re: [RFC PATCH net-next v2 0/6] net: xilinx: axienet: Enable adaptive IRQ coalescing with DIM

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Message-ID: <d56ff939-cbcb-4455-b589-3a87b0ec57a4@amd.com>
Date: Mon, 9 Sep 2024 18:34:10 -0700
From: "Nelson, Shannon" <shannon.nelson@....com>
To: Sean Anderson <sean.anderson@...ux.dev>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Radhey Shyam Pandey <radhey.shyam.pandey@....com>, netdev@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org, Michal Simek
 <michal.simek@....com>, linux-kernel@...r.kernel.org,
 Heng Qi <hengqi@...ux.alibaba.com>
Subject: Re: [RFC PATCH net-next v2 0/6] net: xilinx: axienet: Enable adaptive
 IRQ coalescing with DIM

On 9/9/2024 4:52 PM, Sean Anderson wrote:
> 
> To improve performance without sacrificing latency under low load,
> enable DIM. While I appreciate not having to write the library myself, I
> do think there are many unusual aspects to DIM, as detailed in the last
> patch.
> 
> This series depends on [1-2] and is therefore marked RFC. This series is
> otherwise ready to merge.
> 
> [1] https://lore.kernel.org/netdev/20240909230908.1319982-1-sean.anderson@linux.dev/
> [2] https://lore.kernel.org/netdev/20240909231904.1322387-1-sean.anderson@linux.dev/
> 
> Changes in v2:
> - Add some symbolic constants for IRQ delay timer
> - Report an error for bad coalesce settings
> - Don't use spin_lock_irqsave when we know the context
> - Split the CR calculation refactor from runtime coalesce settings
>    adjustment support for easier review.
> - Have axienet_update_coalesce_rx/tx take the cr value/mask instead of
>    calculating it with axienet_calc_cr. This will make it easier to add
>    partial updates in the next few commits.
> - Get coalesce parameters from driver state
> - Don't take the RTNL in axienet_rx_dim_work to avoid deadlock. Instead,
>    calculate a partial cr update that axienet_update_coalesce_rx can
>    perform under a spin lock.
> - Use READ/WRITE_ONCE when accessing/modifying rx_irqs
> 
> Sean Anderson (6):
>    net: xilinx: axienet: Add some symbolic constants for IRQ delay timer
>    net: xilinx: axienet: Report an error for bad coalesce settings
>    net: xilinx: axienet: Combine CR calculation
>    net: xilinx: axienet: Support adjusting coalesce settings while
>      running
>    net: xilinx: axienet: Get coalesce parameters from driver state
>    net: xilinx: axienet: Enable adaptive IRQ coalescing with DIM
> 
>   drivers/net/ethernet/xilinx/Kconfig           |   1 +
>   drivers/net/ethernet/xilinx/xilinx_axienet.h  |  31 +-
>   .../net/ethernet/xilinx/xilinx_axienet_main.c | 320 ++++++++++++++----
>   3 files changed, 273 insertions(+), 79 deletions(-)
> 
> --
> 2.35.1.1320.gc452695387.dirty
> 
> 

Except for a couple of comment nits pointed out in 3/6 and 6/6, this set 
seems reasonable.

Reviewed by: Shannon Nelson <shannon.nelson@....com>