netdev - Re: [PATCH] ftgmac100: Disable HW checksum generation on AST2500

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Date:   Tue, 10 Sep 2019 15:05:28 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vijay Khemka <vijaykhemka@...com>,
        "David S. Miller" <davem@...emloft.net>,
        YueHaibing <yuehaibing@...wei.com>, Andrew Lunn <andrew@...n.ch>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "openbmc @ lists . ozlabs . org" <openbmc@...ts.ozlabs.org>,
        joel@....id.au, linux-aspeed@...ts.ozlabs.org, sdasari@...com
Subject: Re: [PATCH] ftgmac100: Disable HW checksum generation on AST2500

On 9/10/19 2:37 PM, Vijay Khemka wrote:
> HW checksum generation is not working for AST2500, specially with IPV6
> over NCSI. All TCP packets with IPv6 get dropped. By disabling this
> it works perfectly fine with IPV6.
> 
> Verified with IPV6 enabled and can do ssh.

How about IPv4, do these packets have problem? If not, can you continue
advertising NETIF_F_IP_CSUM but take out NETIF_F_IPV6_CSUM?

> 
> Signed-off-by: Vijay Khemka <vijaykhemka@...com>
> ---
>  drivers/net/ethernet/faraday/ftgmac100.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
> index 030fed65393e..591c9725002b 100644
> --- a/drivers/net/ethernet/faraday/ftgmac100.c
> +++ b/drivers/net/ethernet/faraday/ftgmac100.c
> @@ -1839,8 +1839,9 @@ static int ftgmac100_probe(struct platform_device *pdev)
>  	if (priv->use_ncsi)
>  		netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
>  
> -	/* AST2400  doesn't have working HW checksum generation */
> -	if (np && (of_device_is_compatible(np, "aspeed,ast2400-mac")))
> +	/* AST2400  and AST2500 doesn't have working HW checksum generation */
> +	if (np && (of_device_is_compatible(np, "aspeed,ast2400-mac") ||
> +		   of_device_is_compatible(np, "aspeed,ast2500-mac")))
>  		netdev->hw_features &= ~NETIF_F_HW_CSUM;
>  	if (np && of_get_property(np, "no-hw-checksum", NULL))
>  		netdev->hw_features &= ~(NETIF_F_HW_CSUM | NETIF_F_RXCSUM);
> 


-- 
Florian