zz Sent from my iPhone > On May 27, 2025, at 15:18, ovs-discuss-requ...@openvswitch.org wrote: > > Send discuss mailing list submissions to > ovs-discuss@openvswitch.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss > or, via email, send a message with subject or body 'help' to > ovs-discuss-requ...@openvswitch.org > > You can reach the person managing the list at > ovs-discuss-ow...@openvswitch.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of discuss digest..." > > > Today's Topics: > > 1. Re: Packet Drop Issue in DPDK-OVS Bridge on Alveo U200 > (Thenveer Poolakkanni) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 27 May 2025 07:18:00 +0000 > From: Thenveer Poolakkanni <thenveer.poolakka...@iwave-global.com> > To: Ilya Maximets <i.maxim...@ovn.org>, "ovs-discuss@openvswitch.org" > <ovs-discuss@openvswitch.org> > Cc: Ayshathul Thuhara <ayshathul.thuh...@iwave-global.com> > Subject: Re: [ovs-discuss] Packet Drop Issue in DPDK-OVS Bridge on > Alveo U200 > Message-ID: > > <pn3p287mb0273c7e6bc54d7e8766d68ceb7...@pn3p287mb0273.indp287.prod.outlook.com> > > Content-Type: text/plain; charset="big5" > > Hi Ilya, > > Thanks for the input. I have enabled additional debug in driver side, I am > able to receive and send the packets from driver. Could you suggest what else > I should check on the OVS side? Why the packet sent from driver is not listed > in OVS statistics ? > Best regards, > Thenveer > > > > > ________________________________ > From: Ilya Maximets <i.maxim...@ovn.org> > Sent: Wednesday, May 21, 2025 6:30 PM > To: Thenveer Poolakkanni <thenveer.poolakka...@iwave-global.com>; > ovs-discuss@openvswitch.org <ovs-discuss@openvswitch.org> > Cc: i.maxim...@ovn.org <i.maxim...@ovn.org>; Ayshathul Thuhara > <ayshathul.thuh...@iwave-global.com> > Subject: Re: [ovs-discuss] Packet Drop Issue in DPDK-OVS Bridge on Alveo U200 > >> On 5/21/25 2:32 PM, Thenveer Poolakkanni wrote: >> Hi Ilya, >> Thanks for your input. >> When I check the statistics using: >> >> |ovs-vsctl get interface pf1 statistics | >> >> I do see |tx| packets being counted. >> Additionally, I tested interfaces using DPDK sample applications (|l2fwd| >> and |l3fwd|), and in those cases, packets are being received and forwarded >> correctly ? including getting the return traffic back at the traffic >> generator. >> Please let me know if there are additional checks you would recommend . > > If it works with l2fwd and doesn't work with OVS, then you need to look > at the driver and find the difference between how OVS sets it up and how > the same is done by l2fwd. You may enable debug logging for your driver > via dpdk-extra config. But essentially, it sounds like a driver problem. > You'll need to ask maintainers of this driver. > > Best regards, Ilya Maximets. > >> Best regards, >> Thenveer >> >> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ >> *From:* Ilya Maximets <i.maxim...@ovn.org> >> *Sent:* Wednesday, May 21, 2025 5:36 PM >> *To:* Thenveer Poolakkanni <thenveer.poolakka...@iwave-global.com>; >> ovs-discuss@openvswitch.org <ovs-discuss@openvswitch.org> >> *Cc:* i.maxim...@ovn.org <i.maxim...@ovn.org>; Ayshathul Thuhara >> <ayshathul.thuh...@iwave-global.com> >> *Subject:* Re: [ovs-discuss] Packet Drop Issue in DPDK-OVS Bridge on Alveo >> U200 >> >>> On 5/21/25 1:57 PM, Thenveer Poolakkanni wrote: >>> Hi Ilya, >>> Thank you for your response. >>> I have created flow rules in both directions and removed the |NORMAL| rule >>> as >>> advised. However, I'm still facing the same issue .Also packets are only >>> received on one port (|pf0|). When sending traffic from both pktgen ports >>> simultaneously, only the traffic towards |pf0| is received, while nothing >>> is received on |pf1|. >>> Here?s the current flow setup: >>> >>> cookie=0x0, duration=535.650s, table=0, n_packets=0, n_bytes=0, in_port=pf1 >>> actions=output:pf0 >>> cookie=0x0, duration=533.028s, table=0, n_packets=1905, n_bytes=123065, >>> in_port=pf0 actions=output:pf1 >>> >>> Port statistics: >>> >>> | port pf0: rx pkts=1905, tx pkts=0 port pf1: rx pkts=0, tx pkts=1905 >>> | >>> >>> It appears that traffic transmitted from |pf1| is not being received at all >>> . >>> Please let me know if there's anything further I should check . I?ve also >>> confirmed that both interfaces are correctly added to the bridge and are >>> bound with DPDK. >> >> I don't think the issue is in OVS in this case. You need to look into the >> DPDK driver that you're using or firmware / hardware / external network. >> >> The last thing that you should be able to check from the OVS side is packet >> counters from the card. Check the: >> ovs-vsctl get interface pf1 statistics >> And look for errors or dropped/missed packets. >> >> Best regards, Ilya Maximets. >> >>> Best regards, >>> Thenveer >>> >>> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ >>> *From:* Ilya Maximets <i.maxim...@ovn.org> >>> *Sent:* Wednesday, May 21, 2025 2:38 PM >>> *To:* Thenveer Poolakkanni <thenveer.poolakka...@iwave-global.com>; >>> ovs-discuss@openvswitch.org <ovs-discuss@openvswitch.org> >>> *Cc:* i.maxim...@ovn.org <i.maxim...@ovn.org>; Ayshathul Thuhara >>> <ayshathul.thuh...@iwave-global.com> >>> *Subject:* Re: [ovs-discuss] Packet Drop Issue in DPDK-OVS Bridge on Alveo >>> U200 >>> >>> On 5/21/25 7:32 AM, Thenveer Poolakkanni wrote: >>>> Hi Ilya, >>>> Thank you for the insights. >>>> As suggested, I created a flow rule with |in_port=pf0 actions=output:pf1| >>>> to avoid using the default |NORMAL| action. I also checked the link status >>>> of the bridge port. It was initially down, so I brought it up, but its >>>> state then changed to |UNKNOWN|. >>>> Despite these changes, I'm still not receiving packets back. Here are some >>>> logs for reference: >>>> :ovs-netdev: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc >>>> fq_codel state UNKNOWN group default qlen 1000 >>>> link/ether 62:d6:ea:54:b9:1e brd ff:ff:ff:ff:ff:ff >>>> : br0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc fq_codel >>>> state UNKNOWN group default qlen 1000 >>>> link/ether 3a:30:0e:d7:af:4a brd ff:ff:ff:ff:ff:ff >>>> >>>> OpenFlow flow dump: >>>> >>>> cookie=0x0, duration=350.705s, table=0, n_packets=3188, n_bytes=209110, >>>> in_port=pf0 actions=output:pf1 >>>> cookie=0x0, duration=402.852s, table=0, n_packets=23, n_bytes=2616, >>>> priority=0 actions=NORMAL >>> >>> You only created a rule in one direction. You need a separate >>> rule for traffic coming back from pf1 to pf0. And you need to >>> either delete the NORMAL rule, or use higher priority for your >>> direct ones, otherwise the behavior is undefined. >>> >>> Best regards, Ilya Maximets. >>> >>>> >>>> It seems the packets are not returning even with the explicit flow rule. >>>> Is there anything else I should try on the OVS side? >>>> Best regards, >>>> Thenveer >>>> >>>> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ >>>> *From:* Ilya Maximets <i.maxim...@ovn.org> >>>> *Sent:* Wednesday, May 14, 2025 4:18 PM >>>> *To:* Thenveer Poolakkanni <thenveer.poolakka...@iwave-global.com>; >>>> ovs-discuss@openvswitch.org <ovs-discuss@openvswitch.org> >>>> *Cc:* Ayshathul Thuhara <ayshathul.thuh...@iwave-global.com>; >>>> i.maxim...@ovn.org <i.maxim...@ovn.org> >>>> *Subject:* Re: [ovs-discuss] Packet Drop Issue in DPDK-OVS Bridge on Alveo >>>> U200 >>>> >>>> On 5/9/25 6:19 AM, Thenveer Poolakkanni via discuss wrote: >>>>> Hi Team, >>>>> >>>>> I?m currently working with Open vSwitch (OVS) using the DPDK datapath >>>>> on a Alveo U200, and I?ve encountered an issue where packets are not >>>>> being received back on the traffic generator after being transmitted >>>>> by OVS. >>>>> >>>>> Setup Details: >>>>> >>>>> - Traffic Generator: >>>>> - Port 0 ? Connected to Alveo U200 pf0 >>>>> - Port 1 ? Connected to Alveo U200 pf1 >>>>> - OVS is running on the Alveo U200 (datapath_type=netdev), and both >>>>> `pf0` and `pf1` are added as DPDK ports to a bridge named `br0`. >>>>> >>>>> OVS Configuration: >>>>> d76b4ea2-df9e-4d2e-8f9d-06210013ffef >>>>> Bridge br0 >>>>> datapath_type: netdev >>>>> Port br0 >>>>> Interface br0 >>>>> type: internal >>>>> Port pf0 >>>>> Interface pf0 >>>>> type: dpdk >>>>> options: {dpdk-devargs="0000:08:00.0", n_rxq="4", >>>>> n_rxq_desc="1024", n_txq="4", n_txq_desc="1024"} >>>>> Port pf1 >>>>> Interface pf1 >>>>> type: dpdk >>>>> options: {dpdk-devargs="0000:08:00.1", n_rxq="4", >>>>> n_rxq_desc="1024", n_txq="4", n_txq_desc="1024"} >>>>> >>>>> After sending packets from the traffic generator to `pf0`, here are the >>>>> stats: >>>>> >>>>> OFPST_PORT reply (xid=0x2): 3 ports >>>>> port LOCAL: rx pkts=0, bytes=0, drop=0, errs=0, frame=0, over=0, crc=0 >>>>> tx pkts=0, bytes=0, drop=100, errs=0, coll=0 >>>>> port pf0: rx pkts=100, bytes=6000, drop=0, errs=0, frame=?, over=?, >>>>> crc=? >>>>> tx pkts=0, bytes=0, drop=0, errs=0, coll=? >>>>> port pf1: rx pkts=0, bytes=0, drop=0, errs=0, frame=?, over=?, crc=? >>>>> tx pkts=100, bytes=6000, drop=0, errs=0, coll=? >>>>> >>>>> >>>>> Why are packets being dropped at the `LOCAL` port, and is that affecting >>>>> forwarding? >>>> >>>> You're likely sending traffic only in one direction, so the bridge >>>> can't learn where the destination is and broadcasts these packets >>>> to every port on the bridge. The bridge port is probably down, so >>>> packets sent to it a dropped. Broadcasting to kernel interfaces >>>> will significantly affect performance, but your packets should still >>>> arrive just fine on the other port. So, if you don't see them, >>>> the problem is likely with the driver or a card or otherwise outside >>>> of OVS. >>>> >>>> To avoid brodcasting you either need to send some traffic in the >>>> opposite direction or stop using the default NORMAL action in your >>>> OpenFlow configuration. A rule like in_port=pf0,actions:pf1 would >>>> just forward everything directly without learning and broadcasting. >>>> >>>> Best regards, Ilya Maximets. >>> >> > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://mail.openvswitch.org/pipermail/ovs-discuss/attachments/20250527/8fdf0a46/attachment.htm> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > discuss mailing list > disc...@openvswitch.org > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss > > > ------------------------------ > > End of discuss Digest, Vol 191, Issue 69 > ****************************************
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