linux-kernel - Re: [PATCH net-next 08/11] net: stmmac: Add EMAC3 variant of dwmac4

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Date:   Thu, 16 Mar 2023 13:36:09 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...aro.org,
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        jsuraj@....qualcomm.com, hisunil@...cinc.com
Subject: Re: [PATCH net-next 08/11] net: stmmac: Add EMAC3 variant of dwmac4

On Mon, Mar 13, 2023 at 05:39:04PM -0700, Jakub Kicinski wrote:
> On Mon, 13 Mar 2023 11:56:17 -0500 Andrew Halaney wrote:
> > EMAC3 is a Qualcomm variant of dwmac4 that functions the same, but has a
> > different address space layout for MTL and DMA registers. This makes the
> > patch a bit more complicated than we would like so let's explain why the
> > current approach was used.
> 
> Please drop all the static inlines in C sources, you're wrapping 
> a single function call, the compiler will do the right thing.
> 
> Please no more than 6 function arguments.
> 

Thanks for the feedback! With respect to <= 6 function arguments, if I
counted right the only violation is this:

static void do_config_cbs(struct mac_device_info *hw, u32 send_slope,
			  u32 idle_slope, u32 high_credit, u32 low_credit,
			  u32 queue, u32 etsx_ctrl_base_addr,
			  u32 send_slp_credx_base_addr,
			  u32 high_credx_base_addr, u32 low_credx_base_addr,
			  void (*set_mtl_tx_queue_weight)(struct mac_device_info *hw,
							  u32 weight, u32 queue))
(...)
static void emac3_config_cbs(struct mac_device_info *hw, u32 send_slope,
				    u32 idle_slope, u32 high_credit,
				    u32 low_credit, u32 queue)

I agree, that's quite gnarly to read. the emac3_config_cbs is the
callback, so it's already at 6 arguments, so there's nothing I can
trim there. I could create some struct for readability, populate that,
then call the do_config_cbs() func with it from emac3_config_cbs.
Is that the sort of thing you want to see?

Thanks,
Andrew