Ok, it seems that there is some issue initializing the buffer and/or freeing it after use. It is not a DPDK issue not regenerated. 1) What are the trailing bytes at the end of UDP packets? 2) Are you reusing the buffer and/or initializing it correctly? 3) What NIC features are you using i.e. tx offloading? (As VLAN 12 has checksum calculated while VLAN 0 has not) Try forcing these bytes zero before and after sending the packet to see the impact
On Mon, May 17, 2021 at 4:45 PM Jagan P <jagan...@altran.com> wrote: > Hi Muhammad, > > > > We are using a single node connected to spirent Testcenter application(to > send and receive traffic). > > The dpdk version used is 20.05 version. > > > > I have attached the packets captured in egress flow for vlan 0(vlan_0_pkt > file) and with a valid vlan(vlan 12 and 18 – vlan_12_18_static file). > > We printed the packet in *ixgbe_xmit_pkts* API for vlan 0 and 12 and the > captured dump is attached in “vlan_0 pkt_dump” file. > > > > We are sending IP packet with vlan tag along with UDP header. The packet > flow will be as below. > > ingress port(rte_eth_rx_burst) => firewall =>routing=> nhop lookup =>ARP > lookup => egress port pkt forwarding(rte_eth_tx_burst). > > > > We added packet dump before and after calling *rte_eth_tx_burst* API in > our application. The dump looks good. So we added packet dump in > *ixgbe_xmit_pkts* API as well to confirm whether the packet in proper in > driver and the packet is proper here as well. > > > > We are not sure why the IP control flags and UDP dest port values are > modified. Should we handle anything specifically for packets with vlan id 0 > in rte_mbuf structure? > > > > Please share us your thoughts on this. > > Please let us know if any details are needed further. > > > > Thanks, > > Jagan P > > > > *From:* Muhammad Zain-ul-Abideen <zain2...@gmail.com> > *Sent:* Monday, May 17, 2021 2:16 PM > *To:* Jagan P <jagan...@altran.com> > *Cc:* users@dpdk.org > *Subject:* Re: [dpdk-users] DPDK support for vlan id 0 > > > > ** This mail has been sent from an external source ** > > > > Kindly tell us more about the setup and which dpdk you are using. and what > is the packet life at sender and receiver. > > > > > > > > > > On Mon, May 17, 2021 at 1:01 PM Jagan P <jagan...@altran.com> wrote: > > Hi, > We were trying to forward packets with vlan id as 0. But the packet is > getting altered when we do so. > The IP flag and the destination port fields are getting changed. We doubt > if this is happening in DPDK because till the rte_eth_tx_burst API, the > packet is proper. > But the packet captured at the destination is altered. > Could you please let us know if there is support in DPDK for forwarding > packet with vlan id 0 or if we are missing something. > > Packet at rte_eth_tx_burst: > dump mbuf at 0x1706dad00, iova=0x1706dad80, buf_len=2304 > pkt_len=252, ol_flags=0xf0000000000181, nb_segs=1, port=0, vlan_tci=0, > ptype=0x211 > segment at 0x1706dad00, data=0x1706dae04, len=252, off=132, refcnt=1 > Dump data at [0x1706dae04], len=200 > 00000000: 00 10 94 00 00 05 00 01 02 03 04 05 81 00 00 00 | > ................ > 00000010: 08 00 45 00 00 EA 00 02 00 00 3F 11 00 00 02 02 | > ..E.......?..... > 00000020: 02 02 05 05 05 02 62 A4 62 A3 00 D6 0E F2 00 00 | > ......b.b....... > 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 00000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 000000A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 000000B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | > ................ > 000000C0: 00 00 00 00 00 00 00 00 > > Packet captured at spirent(destination): > 00 10 94 00 00 05 00 01 02 03 04 05 81 00 00 00 > 08 00 45 00 00 EA 00 02 6e fe 3F 11 00 00 02 02 > 02 02 05 05 05 02 62 A4 f5 f8 00 D6 0E F2 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > > Thanks, > Jagan P > > ===================================================== > Please refer to https://northamerica.altran.com/email-disclaimer > for important disclosures regarding this electronic communication. > ===================================================== > > ===================================================== > Please refer to https://northamerica.altran.com/email-disclaimer > for important disclosures regarding this electronic communication. > ===================================================== >
