netdev - Re: [PATCH RFC 6/6] net/faraday: Enable offload checksum according to device-tree

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Date:	Mon, 9 Nov 2015 11:45:01 +1100
From:	Gavin Shan <gwshan@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Gavin Shan <gwshan@...ux.vnet.ibm.com>, netdev@...r.kernel.org,
	davem@...emloft.net, sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH RFC 6/6] net/faraday: Enable offload checksum according
 to device-tree

On Mon, Nov 09, 2015 at 11:36:10AM +1100, Benjamin Herrenschmidt wrote:
>On Mon, 2015-11-09 at 11:10 +1100, Gavin Shan wrote:
>> This enables IP/UDP/TCP offload checksum according to information
>> passed on from bootloader through device-tree. The offload doesn't
>> working properly when the interface works in NCSI mode.
>> 
>> Signed-off-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>
>> ---
>>  drivers/net/ethernet/faraday/ftgmac100.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
>> index 1b13fd4..1e2f4d2 100644
>> --- a/drivers/net/ethernet/faraday/ftgmac100.c
>> +++ b/drivers/net/ethernet/faraday/ftgmac100.c
>> @@ -1377,7 +1377,10 @@ static int ftgmac100_probe(struct platform_device *pdev)
>>  
>>  > 	> netdev->ethtool_ops = &ftgmac100_ethtool_ops;
>>  > 	> netdev->netdev_ops = &ftgmac100_netdev_ops;
>> -> 	> netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
>> +> 	> netdev->features = NETIF_F_GRO;
>> +> 	> if (pdev->dev.of_node &&
>> +> 	>     of_property_read_bool(pdev->dev.of_node, "no-hw-checksum"))
>> +> 	> 	> netdev->features |= NETIF_F_IP_CSUM;
>
>Am I reading properly that if you put "no-hw-checksum" in the device-
>tree you *enable* HW checksum ? This doesn't look right to me...
>
>The logic should be:
>
>	if (pdev->dev.of_node &&
>		of_property_read_bool(pdev->dev.of_node, "no-hw-checksum"))
>		netdev->features &= ~NETIF_F_IP_CSUM;
>

Thanks, Ben. You're right. This flag affects TCP flows and I didn't test
it with this series of patchset. I'll adjust the code accordingly in next
respin.

Thanks,
Gavin

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