[PATCH v2] ftgmac100: Disable HW checksum generation on AST2500

[Vijay Khemka]

Florian/Joel,
Can you please look into below patch and let me know who can apply this.

Regards
-Vijay

On 9/17/19, 12:34 PM, "Vijay Khemka" <vijaykhemka at fb.com> wrote:

    Please review below patch and provide your valuable feedback.
    
    Regards
    -Vijay
    
    On 9/11/19, 1:05 PM, "Vijay Khemka" <vijaykhemka at fb.com> 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. As it works for IPV4 so enabled
        hw checksum back for IPV4.
        
        Verified with IPV6 enabled and can do ssh.
        
        Signed-off-by: Vijay Khemka <vijaykhemka at fb.com>
        ---
        Changes since v1:
         Enabled IPV4 hw checksum generation as it works for IPV4.
        
         drivers/net/ethernet/faraday/ftgmac100.c | 13 ++++++++++++-
         1 file changed, 12 insertions(+), 1 deletion(-)
        
        diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
        index 030fed65393e..0255a28d2958 100644
        --- a/drivers/net/ethernet/faraday/ftgmac100.c
        +++ b/drivers/net/ethernet/faraday/ftgmac100.c
        @@ -1842,8 +1842,19 @@ static int ftgmac100_probe(struct platform_device *pdev)
         	/* AST2400  doesn't have working HW checksum generation */
         	if (np && (of_device_is_compatible(np, "aspeed,ast2400-mac")))
         		netdev->hw_features &= ~NETIF_F_HW_CSUM;
        +
        +	/* AST2500 doesn't have working HW checksum generation for IPV6
        +	 * but it works for IPV4, so disabling hw checksum and enabling
        +	 * it for only IPV4.
        +	 */
        +	if (np && (of_device_is_compatible(np, "aspeed,ast2500-mac"))) {
        +		netdev->hw_features &= ~NETIF_F_HW_CSUM;
        +		netdev->hw_features |= NETIF_F_IP_CSUM;
        +	}
        +
         	if (np && of_get_property(np, "no-hw-checksum", NULL))
        -		netdev->hw_features &= ~(NETIF_F_HW_CSUM | NETIF_F_RXCSUM);
        +		netdev->hw_features &= ~(NETIF_F_HW_CSUM | NETIF_F_RXCSUM
        +					 | NETIF_F_IP_CSUM);
         	netdev->features |= netdev->hw_features;
         
         	/* register network device */
        -- 
        2.17.1