On Tue, 2 Jun 2020 21:22:11 +0200 Victor Julien wrote: > - receiver uses nfp (netronome) driver: TP_STATUS_CSUM_VALID set for > every packet, including the bad TCP ones > - receiver uses ixgbe driver: TP_STATUS_CSUM_VALID not set for the bad > packets. > > Again purely based on 'git grep' it seems nfp does not support > UNNECESSARY, while ixgbe does. > > (my original testing was with the nfp only, so now I at least understand > my original thinking) FWIW nfp defaults to CHECKSUM_COMPLETE if the device supports it (see if you have RXCSUM_COMPLETE in the probe logs). It supports UNNECESSARY as well, but IDK if there is a way to choose the preferred checksum types in the stack :( You'd have to edit the driver and remove the NFP_NET_CFG_CTRL_CSUM_COMPLETE from the NFP_NET_CFG_CTRL_RXCSUM_ANY mask to switch to using UNNECESSARY.
