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

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Date:   Tue, 10 Sep 2019 22:48:43 +0000
From:   Vijay Khemka <vijaykhemka@...com>
To:     Florian Fainelli <f.fainelli@...il.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" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "openbmc @ lists . ozlabs . org" <openbmc@...ts.ozlabs.org>,
        "joel@....id.au" <joel@....id.au>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        Sai Dasari <sdasari@...com>
Subject: Re: [PATCH] ftgmac100: Disable HW checksum generation on AST2500



On 9/10/19, 3:05 PM, "Florian Fainelli" <f.fainelli@...il.com> wrote:

    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?

I changed code from (netdev->hw_features &= ~NETIF_F_HW_CSUM) to 
(netdev->hw_features &= ~NETIF_F_ IPV6_CSUM). And it is not working. 
Don't know why. IPV4 works without any change but IPv6 needs HW_CSUM
Disabled.
    
    > 
    > 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