linux-kernel - Re: [PATCH] octeontx2-pf: Add egress PFC support

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Message-ID: <YwT3V6A4xrS3jAqf@lunn.ch>
Date:   Tue, 23 Aug 2022 17:50:47 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Suman Ghosh <sumang@...vell.com>
Cc:     sgoutham@...vell.com, lcherian@...vell.com, gakula@...vell.com,
        jerinj@...vell.com, hkelam@...vell.com, sbhatta@...vell.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] octeontx2-pf: Add egress PFC support

> -int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
> +int otx2_txschq_config(struct otx2_nic *pfvf, int lvl, int prio, bool txschq_for_pfc)
>  {
>  	struct otx2_hw *hw = &pfvf->hw;
>  	struct nix_txschq_config *req;
> @@ -602,7 +602,13 @@ int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
>  	req->lvl = lvl;
>  	req->num_regs = 1;
>  
> -	schq = hw->txschq_list[lvl][0];
> +#ifdef CONFIG_DCB
> +	if (txschq_for_pfc)
> +		schq = pfvf->pfc_schq_list[lvl][prio];
> +	else
> +#endif

Please could you try to remove as many of these #ifdef CONFIG_DCB as
possible. It makes build testing less efficient at finding build
problems. Can you do:

> +	if (IS_ENABLED(CONFIG_DCB) && txschq_for_pfc)
> +		schq = pfvf->pfc_schq_list[lvl][prio];

> +#ifdef CONFIG_DCB
> +int otx2_pfc_txschq_config(struct otx2_nic *pfvf)
> +{
> +	u8 pfc_en, pfc_bit_set;
> +	int prio, lvl, err;
> +
> +	pfc_en = pfvf->pfc_en;
> +	for (prio = 0; prio < NIX_PF_PFC_PRIO_MAX; prio++) {
> +		pfc_bit_set = pfc_en & (1 << prio);
> +

Maybe put all of this into a file of its own, and provide stubs for
when it is not enabled?

     Andrew