Hi, I am aware that this topic has been discussed several times before, but I am somehow still stuck with this.
I am using dpdk 1.6r1, intel 82599 NIC. I have an mbuf, I have hand-constructed a UDP packet (IPv4) in the data portion, filled the relevant fields of the headers and I do a tx burst. No problems, the destination gets the packet. I filled UDP checksum as zero and there was no checksum offloaded in ol_flags. Now in the same usecase, I want to offload UDP checksum. I am aware that the checksum field in UDP header has to be filled with the pseudo header checksum, I did that, duly added the PKT_TX_UDP_CKSUM flag in ol_flags, did a tx_burst and the packet does not reach the destination. I realized that I have to fill the following fields as well (my packet does not have vlan tag) mbuf->pkt.vlan_macip.f.l2_len mbuf->pkt.vlan_macip.f.l3_len so I filled the l2_len as 14 and l3_len as 20 (IP header with no options) Yet the packet did not reach the destination. So my question is -- am I filling the l2_len and l3_len properly ? Is there anything else to be done before I can get this UDP checksum offload to work properly for me. Regards -Prashant
