Hi Andrew, On 30/11/18 11:37 pm, Andrew Lunn wrote:
1. TX packets are not getting an IP header checksum via the normal off-loaded checksumming when in DSA mode. I have to switch off NETIF_F_IP_CSUM, so the software stack generates the checksum. That checksum offloading works ok when not using the 7530 DSA driver.With some vendors MAC hardware, there is a field in the descriptor to indicate how big a VLAN tag the frame has. The hardware can then use this information to skip over the VLAN tags to find the IP header, and then perform checksuming. You might be able to re-use that, consider the DSA header as part of the VLAN header. Other vendors, there is no way i've found to get hadware offload of checksumming working.
Thanks for the tips, I will try out the master mtu change too. Regards Greg
