netdev - Re: [PATCH net] net: ethernet: ti: am65-cpsw: Add RX DMA Channel Teardown Quirk

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Date:   Sat, 11 Feb 2023 03:30:18 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Siddharth Vadapalli <s-vadapalli@...com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        linux@...linux.org.uk, pabeni@...hat.com, rogerq@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, vigneshr@...com, srk@...com
Subject: Re: [PATCH net] net: ethernet: ti: am65-cpsw: Add RX DMA Channel Teardown
 Quirk

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Thu, 9 Feb 2023 14:14:32 +0530 you wrote:
> In TI's AM62x/AM64x SoCs, successful teardown of RX DMA Channel raises an
> interrupt. The process of servicing this interrupt involves flushing all
> pending RX DMA descriptors and clearing the teardown completion marker
> (TDCM). The am65_cpsw_nuss_rx_packets() function invoked from the RX
> NAPI callback services the interrupt. Thus, it is necessary to wait for
> this handler to run, drain all packets and clear TDCM, before calling
> napi_disable() in am65_cpsw_nuss_common_stop() function post channel
> teardown. If napi_disable() executes before ensuring that TDCM is
> cleared, the TDCM remains set when the interfaces are down, resulting in
> an interrupt storm when the interfaces are brought up again.
> 
> [...]

Here is the summary with links:
  - [net] net: ethernet: ti: am65-cpsw: Add RX DMA Channel Teardown Quirk
    https://git.kernel.org/netdev/net/c/0ed577e7e8e5

You are awesome, thank you!
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