Date: Mon, 1 Jun 2020 15:19:09 +0200 From: Anthony Arnaud <antho.arnaudisce@gmail.com> To: Vincenzo Maffione <vmaffione@freebsd.org> Cc: Luigi Rizzo <rizzo@iet.unipi.it>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Netmap - Vale switch - tcp problem Message-ID: <CAGCUUMEtuk4GW-7O%2B_XNcsh%2Bfrzu2O8ZBR_7SDQ-ir=L-dk0rw@mail.gmail.com> In-Reply-To: <CA%2B_eA9j9zTM2JwCeMy6FmJQJmorVzXns2ijFgjuXa%2BrRQH400A@mail.gmail.com> References: <CAGCUUMGxxiv8j-W3S8Gs1g=ZbDLnU8_Hv6SVMCpmnrRXPNsUTA@mail.gmail.com> <CA%2BhQ2%2BhfDvKv8q%2BjUB-mv_TaUTHfTPabx-qem-0=PW3vu8Br=A@mail.gmail.com> <CAGCUUMHwRghU3AMgKhQNrUs248y=NaGFN2Fm-f4khqhRsWn-qg@mail.gmail.com> <CA%2B_eA9iukqVoDZFyyW2qEZ2OHfE9=fUj070uUXcYmrXt67mwqw@mail.gmail.com> <CAGCUUMG7HG%2B8X89AYrhQ4dh6-equsvOLNyn_3sNU8h55PjPv9A@mail.gmail.com> <CA%2B_eA9j9zTM2JwCeMy6FmJQJmorVzXns2ijFgjuXa%2BrRQH400A@mail.gmail.com>
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Hi Vincenzo, To simplify the scenario I have installed from scratch FBSD12.1 on a new machine, without any virtualization env. I have encountered the same problem, when i attach an ethernet interface to vale switch (in this case an intel card em5) the tcp traffic disappears and tcpdump shown only udp, icmp6 and stp packets. If I detach the NIC from vale0 tcpdump shown all tcp traffic. I'm using the netmap version included in FBSD 12.1, and I have compiled vale-ctl presents in kernel sources (/src/tools/tools/netmap/) I executed your steps. There is something dark about that behaviour... Cheers Anthon Il giorno sab 30 mag 2020 alle ore 14:29 Vincenzo Maffione < vmaffione@freebsd.org> ha scritto: > > > Il giorno ven 29 mag 2020 alle ore 19:01 Anthony Arnaud < > antho.arnaudisce@gmail.com> ha scritto: > >> Hi Vincenzo, >> >> thanks for your hints! >> I rebooted my guest FBSD 12.1 machine, and I have perfomed your steps >> >> #ifconfig vtnet1 -txcsum -rxcsum -tso4 -tso6 up promisc >> >> vtnet1: >> flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC> metric >> 0 mtu 1500 >> >> options=6c04b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6> >> ether 0e:bd:ec:7a:08:06 >> media: Ethernet 10Gbase-T <full-duplex> >> status: active >> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> >> >> tcpdump is ok. >> >> Does it mean you see both ICMP, UDP and TCP traffic? > > >> But after: >> >> #vale-ctl >> >> 446.196827 bdg_ctl [149] bridge:0 port:0 vale0:vtnet1 >> 446.196855 bdg_ctl [149] bridge:0 port:1 vale0:vtnet1^ >> >> tcpdump not work anymore. >> > > Do you see ICMP/UDP only and not TCP? > > >> I don't understand why the tcp traffic disappears. >> In my configuration vtnet1 is a mirror port created by Open vSwitch, but >> I don't think that's the reason. >> >> No, I don't think that's relevant. > > In my setup, vtnet0 is a guest interface backed by a host tap device > (attached to a linux bridge), and hypervisor is QEMU/KVM. > Here are the steps I follow in the VM (in this order): > > # ifconfig vtnet0 -txcsum -rxcsum -tso4 -tso6 up 192.168.100.2/24 > # vale-ctl -h vale0:vtnet0 > > # nc 192.168.100.1 5555 # connect to listening netcat in the host. > hello > abc > [...] > # tcpdump -ni vtnet0 # This shows the TCP traffic. > > I start to see problems when I change the offloads: > # ifconfig vtnet0 -lro > > Cheers, > Vincenzo > > >> Below some info about my configuration: >> >> dev.netmap.iflib_rx_miss_bufs: 0 >> dev.netmap.iflib_rx_miss: 0 >> dev.netmap.iflib_crcstrip: 1 >> dev.netmap.bridge_batch: 1024 >> dev.netmap.default_pipes: 0 >> dev.netmap.priv_buf_num: 4098 >> dev.netmap.priv_buf_size: 2048 >> dev.netmap.buf_curr_num: 163840 >> dev.netmap.buf_num: 163840 >> dev.netmap.buf_curr_size: 2048 >> dev.netmap.buf_size: 2048 >> dev.netmap.priv_ring_num: 4 >> dev.netmap.priv_ring_size: 20480 >> dev.netmap.ring_curr_num: 200 >> dev.netmap.ring_num: 200 >> dev.netmap.ring_curr_size: 36864 >> dev.netmap.ring_size: 36864 >> dev.netmap.priv_if_num: 2 >> dev.netmap.priv_if_size: 1024 >> dev.netmap.if_curr_num: 100 >> dev.netmap.if_num: 100 >> dev.netmap.if_curr_size: 1024 >> dev.netmap.if_size: 1024 >> dev.netmap.ptnet_vnet_hdr: 1 >> dev.netmap.generic_rings: 1 >> dev.netmap.generic_ringsize: 1024 >> dev.netmap.generic_mit: 100000 >> dev.netmap.generic_hwcsum: 0 >> dev.netmap.admode: 0 >> dev.netmap.fwd: 0 >> dev.netmap.txsync_retry: 2 >> dev.netmap.no_pendintr: 1 >> dev.netmap.no_timestamp: 0 >> dev.netmap.verbose: 0 >> >> >> dev.vtnet.1.txq0.rescheduled: 0 >> dev.vtnet.1.txq0.tso: 0 >> dev.vtnet.1.txq0.csum: 0 >> dev.vtnet.1.txq0.omcasts: 0 >> dev.vtnet.1.txq0.obytes: 0 >> dev.vtnet.1.txq0.opackets: 0 >> dev.vtnet.1.rxq0.rescheduled: 0 >> dev.vtnet.1.rxq0.csum_failed: 0 >> dev.vtnet.1.rxq0.csum: 66 >> dev.vtnet.1.rxq0.ierrors: 0 >> dev.vtnet.1.rxq0.iqdrops: 0 >> dev.vtnet.1.rxq0.ibytes: 11904780 >> dev.vtnet.1.rxq0.ipackets: 40984 >> dev.vtnet.1.tx_task_rescheduled: 0 >> dev.vtnet.1.tx_tso_offloaded: 0 >> dev.vtnet.1.tx_csum_offloaded: 0 >> dev.vtnet.1.tx_defrag_failed: 0 >> dev.vtnet.1.tx_defragged: 0 >> dev.vtnet.1.tx_tso_not_tcp: 0 >> dev.vtnet.1.tx_tso_bad_ethtype: 0 >> dev.vtnet.1.tx_csum_bad_ethtype: 0 >> dev.vtnet.1.rx_task_rescheduled: 0 >> dev.vtnet.1.rx_csum_offloaded: 0 >> dev.vtnet.1.rx_csum_failed: 0 >> dev.vtnet.1.rx_csum_bad_proto: 0 >> dev.vtnet.1.rx_csum_bad_offset: 0 >> dev.vtnet.1.rx_csum_bad_ipproto: 0 >> dev.vtnet.1.rx_csum_bad_ethtype: 0 >> dev.vtnet.1.rx_mergeable_failed: 0 >> dev.vtnet.1.rx_enq_replacement_failed: 0 >> dev.vtnet.1.rx_frame_too_large: 0 >> dev.vtnet.1.mbuf_alloc_failed: 0 >> dev.vtnet.1.act_vq_pairs: 1 >> dev.vtnet.1.requested_vq_pairs: 0 >> dev.vtnet.1.max_vq_pairs: 1 >> dev.vtnet.1.%parent: virtio_pci4 >> dev.vtnet.1.%pnpinfo: >> dev.vtnet.1.%location: >> dev.vtnet.1.%driver: vtnet >> dev.vtnet.1.%desc: VirtIO Networking Adapter >> dev.vtnet.0.txq0.rescheduled: 0 >> >> Cheers, >> Anthony >> >> Il giorno gio 28 mag 2020 alle ore 21:38 Vincenzo Maffione < >> vmaffione@freebsd.org> ha scritto: >> >>> Hi, >>> I was trying to reproduce your problem (same FreeBSD release as >>> yours). It looks like there is some sort of bad interaction with LRO. >>> >>> Starting from a fresh boot, if you keep lro enabled, e.g. >>> # ifconfig vtnet0 -txcsum -rxcsum -tso4 -tso6 >>> # vale-ctl .... >>> then I experience no problem (TCP works between vtnet0 and the host, >>> tcpdump on vtnet0 works as expected). >>> >>> As soon as you disable LRO: >>> # ifconfig vtnet0 -lro >>> both TCP and tcpdump stop working. >>> If I enable LRO again, TCP restarts working, but tcpdump doesn't. I need >>> to reboot the machine to fix it. >>> >>> Btw, creating vi0 (persistent VALE port) is not relevant for this test. >>> You may as well use ephemeral VALE ports (e.g. run pkt-gen -i vale0:1 -f >>> rx). >>> >>> I will have a look at the LRO issue asap. In the meantime you could >>> avoid disabling LRO and see if that works for you. >>> >>> Cheers, >>> Vincenzo >>> >>> Il giorno gio 28 mag 2020 alle ore 17:16 Anthony Arnaud < >>> antho.arnaudisce@gmail.com> ha scritto: >>> >>>> I already disabled the checksum, the vtnet config is: >>>> >>>> ifconfig vtnet1 -txcsum -rxcsum -tso4 -tso6 -lro -txcsum6 -rxcsum6 >>>> -vlanmtu >>>> -vlanhwtag -vlanhwfilter -vlanhwtso -vlanhwcsum up promisc >>>> >>>> vtnet1: >>>> flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC> >>>> metric >>>> 0 mtu 1500 >>>> options=1800a8<VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,LINKSTATE,NETMAP> >>>> ether 0e:bd:ec:7a:08:06 >>>> media: Ethernet 10Gbase-T <full-duplex> >>>> status: active >>>> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> >>>> >>>> Sorry for not having posted vtnet config before. >>>> PS: VLAN_HWCSUM is not switchable off for some reason! >>>> the problem is not that. >>>> >>>> Cheers >>>> Anthony >>>> >>>> >>>> >>>> >>>> Il giorno gio 28 mag 2020 alle ore 16:05 Luigi Rizzo < >>>> rizzo@iet.unipi.it> >>>> ha scritto: >>>> >>>> > >>>> > >>>> > On Thursday, May 28, 2020, Anthony Arnaud <antho.arnaudisce@gmail.com >>>> > >>>> > wrote: >>>> > >>>> >> Hi everyone! >>>> >> I would like to create a vale switch with an interface attached with >>>> the >>>> >> host stack and some virtual. >>>> >> My env is a VM with FBSD-12.1 12.1-RELEASE FreeBSD 12.1-RELEASE >>>> r354233 >>>> >> GENERIC amd64 >>>> >> and VirtIO support. >>>> >> >>>> >> I performed: >>>> >> >>>> >> vale-ctl -h vale0:vtnet1 >>>> >> vale-ctl -n vi0 >>>> >> vale-ctl -a vale0:vi0 >>>> >> >>>> >> 615.925514 bdg_ctl [149] bridge:0 port:0 vale0:vtnet1 >>>> >> 615.925559 bdg_ctl [149] bridge:0 port:1 vale0:vtnet1^ >>>> >> 615.925572 bdg_ctl [149] bridge:0 port:2 vale0:vi0 >>>> >> >>>> >> vtnet1 is configured as mirror port. >>>> >> But if: >>>> >> >>>> >> tcpdump -i vtnet1 >>>> >> or >>>> >> tcpdump -i vale0:vi0 >>>> >> >>>> >> why can't I see any TCP packets? >>>> >> UDP and ICMP packet are ok. >>>> >> >>>> >> Without vale switch tcpdump show all TCP packets correctly. >>>> > >>>> > >>>> > You have to disable checksum offloading on vtnet1. >>>> > >>>> > Cheers >>>> > Luigi >>>> > >>>> > It is a bug? >>>> >> Thanks to all! >>>> >> <freebsd-net@freebsd.org> >>>> >> _______________________________________________ >>>> >> freebsd-net@freebsd.org mailing list >>>> >> https://lists.freebsd.org/mailman/listinfo/freebsd-net >>>> >> To unsubscribe, send any mail to " >>>> freebsd-net-unsubscribe@freebsd.org" >>>> >> >>>> > >>>> > >>>> > -- >>>> > >>>> -----------------------------------------+------------------------------- >>>> > Prof. Luigi RIZZO, rizzo@iet.unipi.it . Dip. di Ing. >>>> dell'Informazione >>>> > http://www.iet.unipi.it/~luigi/ . Universita` di Pisa >>>> > TEL +39-050-2217533 . via Diotisalvi 2 >>>> > Mobile +39-338-6809875 . 56122 PISA (Italy) >>>> > >>>> -----------------------------------------+------------------------------- >>>> > >>>> > >>>> _______________________________________________ >>>> freebsd-net@freebsd.org mailing list >>>> https://lists.freebsd.org/mailman/listinfo/freebsd-net >>>> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >>>> >>>
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