Re: [PATCH] net: stmmac: enable MAC rx/tx after DMA start

[Andrew Lunn <andrew@lunn.ch>]

On Mon, Jul 27, 2026 at 05:57:15AM +0000, Abid Ali wrote:
> On Sun, Jul 26, 2026 at 18:15:20 +0000, Andrew Lunn wrote:
> > There should be a function which is the opposite of stmmac_hw_setup(),
> > which tears it down. What order are things done there? tear down is
> > generally done in the opposite order to setup, so does the "Disable
> > the MAC Rx/Tx" also need to move?
> 
> I have not seen the FIFO stall in the teardown in my testing,
> but the MAC Rx/Tx should be disabled before the DMA engine is stopped.
> For the normal path (__stmmac_release), phylink_stop() is called first
> which triggers stmmac_mac_link_down() -> stmmac_mac_set(false), so the
> MAC is already disabled before stmmac_stop_all_dma(). The teardown
> order is already correct there.

Thanks for checking. Please add a comment to the commit message about
this.

> 
> > Same comment for the opposite of stmmac_xdp_open().
> 
> Currently, stmmac_xdp_release() does:
> 
>     stmmac_stop_all_dma(priv);
>     ...
>     stmmac_mac_set(priv, priv->ioaddr, false);
> 
> The ordering is not followed here,  I'll make it follow the similar
> ordering to (__stmmac_release) in v2.

Great.


    Andrew

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