netdev - Re: [PATCH net 1/3] amd-xgbe: Yellow carp devices do not need rrc

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Date:   Thu, 6 Oct 2022 09:32:34 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Raju Rangoju <Raju.Rangoju@....com>, Shyam-sundar.S-k@....com,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, rrangoju@....com
Subject: Re: [PATCH net 1/3] amd-xgbe: Yellow carp devices do not need rrc

On 10/6/22 08:54, Raju Rangoju wrote:
> Yellow carp devices disables the CDR workaround path,
> receiver reset cycle is not needed in such cases.
> Hence, avoid issuing rrc on Yellow carp platforms.
> 
> Fixes: 47f164deab22 ("amd-xgbe: Add PCI device support")

That is the wrong Fixes: tag. Yellow Carp support was added with commit

dbb6c58b5a61 ("net: amd-xgbe: Add Support for Yellow Carp Ethernet device")

However, the changes to allow updating the version data were made with

6f60ecf233f9 ("net: amd-xgbe: Disable the CDR workaround path for Yellow Carp Devices")

so that is the tag most likely needed should you want this to be able to
go to stable.

With a change to the Fixes: tag:

Acked-by: Tom Lendacky <thomas.lendacky@....com>

> Signed-off-by: Raju Rangoju <Raju.Rangoju@....com>
> ---
>   drivers/net/ethernet/amd/xgbe/xgbe-pci.c    | 5 +++++
>   drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c | 2 +-
>   drivers/net/ethernet/amd/xgbe/xgbe.h        | 1 +
>   3 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-pci.c b/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
> index 2af3da4b2d05..f409d7bd1f1e 100644
> --- a/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
> @@ -285,6 +285,9 @@ static int xgbe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>   
>   		/* Yellow Carp devices do not need cdr workaround */
>   		pdata->vdata->an_cdr_workaround = 0;
> +
> +		/* Yellow Carp devices do not need rrc */
> +		pdata->vdata->enable_rrc = 0;
>   	} else {
>   		pdata->xpcs_window_def_reg = PCS_V2_WINDOW_DEF;
>   		pdata->xpcs_window_sel_reg = PCS_V2_WINDOW_SELECT;
> @@ -483,6 +486,7 @@ static struct xgbe_version_data xgbe_v2a = {
>   	.tx_desc_prefetch		= 5,
>   	.rx_desc_prefetch		= 5,
>   	.an_cdr_workaround		= 1,
> +	.enable_rrc			= 1,
>   };
>   
>   static struct xgbe_version_data xgbe_v2b = {
> @@ -498,6 +502,7 @@ static struct xgbe_version_data xgbe_v2b = {
>   	.tx_desc_prefetch		= 5,
>   	.rx_desc_prefetch		= 5,
>   	.an_cdr_workaround		= 1,
> +	.enable_rrc			= 1,
>   };
>   
>   static const struct pci_device_id xgbe_pci_table[] = {
> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
> index 2156600641b6..19b943eba560 100644
> --- a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
> @@ -2640,7 +2640,7 @@ static int xgbe_phy_link_status(struct xgbe_prv_data *pdata, int *an_restart)
>   	}
>   
>   	/* No link, attempt a receiver reset cycle */
> -	if (phy_data->rrc_count++ > XGBE_RRC_FREQUENCY) {
> +	if (pdata->vdata->enable_rrc && phy_data->rrc_count++ > XGBE_RRC_FREQUENCY) {
>   		phy_data->rrc_count = 0;
>   		xgbe_phy_rrc(pdata);
>   	}
> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h b/drivers/net/ethernet/amd/xgbe/xgbe.h
> index b875c430222e..49d23abce73d 100644
> --- a/drivers/net/ethernet/amd/xgbe/xgbe.h
> +++ b/drivers/net/ethernet/amd/xgbe/xgbe.h
> @@ -1013,6 +1013,7 @@ struct xgbe_version_data {
>   	unsigned int tx_desc_prefetch;
>   	unsigned int rx_desc_prefetch;
>   	unsigned int an_cdr_workaround;
> +	unsigned int enable_rrc;
>   };
>   
>   struct xgbe_prv_data {