Thanks for the review Guru. Please see below for the comments.
On Fri, Oct 5, 2018 at 12:09 AM Guru Shetty <g...@ovn.org> wrote: > > > On Mon, 17 Sep 2018 at 02:24, <nusid...@redhat.com> wrote: > >> From: Numan Siddique <nusid...@redhat.com> >> >> When a child vlan interface is created inside a VM, the below kernel >> message >> is seen and IPv6 doesn't work on that interface. >> > > On which interface doesn't IPv6 work? On the Vm's interface or on the > container's interface? > > It is seen on the container's interface. > >> [ 138.000753] IPv6: vlan4: IPv6 duplicate address <IPv6 LLA> detected! >> >> When a child port sends a broadcast packet, OVN delivers the same >> packet back to the child port (and hence the DAD check fails). >> > > Is this limited to IP broadcast only? Or does this happen with mac > broadcast too? (I am surprised why I hadn't seen this behavior with ARP > packets of containers). > It happens with mac broadcast. You can actually reproduce the issue by applying the code in tests/ovn.at without this patch. Looks like I have confused you with the patch. Let me try to give an example. Suppose we have switch - sw0 - with ports p1, p2 and p3 and all of them reside in the same chassis. When p1 sends a broadcast/multicast packet, the below logical flow is hit table=17(ls_in_l2_lkup ), priority=100 , match=(eth.mcast), action=(outport = "_MC_flood"; output;) This translates to the OF flow - metadata=0x1,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=load:0xffff->NXM_NX_REG15[],resubmit(,32) In the table 33 if reg15 has 0xffff, it will resubmit the flow with reg15 set to each logical port i.e reg15=0xffff,metadata=0x1 actions=load:0x1->NXM_NX_REG15[],resubmit(,34),load:0x2>NXM_NX_REG15[],resubmit(,34),load:0x3->NXM_NX_REG15[],resubmit(,34),load:0xffff->NXM_NX_REG15[] In the normal case, the packet will not be delivered back to p1 and instead will be dropped in table 34 (OFTABLE_CHECK_LOOPBACK) since reg10[0] is not set. table=34, n_packets=0, n_bytes=0, priority=100,reg10=0/0x1,reg14=0x2,reg15=0x2,metadata=0x1 actions=drop When the register reg10[0] is set, it means the packet needs to be loop backed to the source port. So table 64 has flows to clear the in_port i,.e table=64, priority=100,reg10=0x1/0x1,reg15=0x1,metadata=0x1 actions=push:NXM_OF_IN_PORT[],load:0->NXM_OF_IN_PORT[],resubmit(,65),pop:NXM_OF_IN_PORT[] Now if we take the example of child ports, let's say "p2" is the child port of "p1" and in_port of p1 is 1 In table 0, we will see 2 flows for in_port=1 match=(in_port=1) - actions=(load:0x1->OXM_OF_METADATA[],load:0x1->NXM_NX_REG14[] and submit to table 8) match=(in_port=1, dl_vlan=4) actions(load:0x1->NXM_NX_REG10[0], strip_vlan, load:0x1->OXM_OF_METADATA[],load:0x2->NXM_NX_REG14[] , and submit to table 8) Suppose if p2 sends a braodcast packet, reg10[0] is set in table 0. In this case, since reg10[0] is set, the broadcast packet is not dropped in table 34 for port "p2" and it gets delivered back. So this patch instead of using reg10[0], it uses a new register bit -MLF_NESTED_CONTAINER_BIT We also need to clear the in_port in table 64 if MLF_NESTED_CONTAINER_BIT is set. I will address the review comments and submit p2. Hope this clears your confusion. Thanks Numan > > > This is because 'MLF_ALLOW_LOOPBACK_BIT' is set in REG10 in table 0 when >> the packet is received from any child port and table >> 'OFTABLE_CHECK_LOOPBACK' >> doesn't drop the packet. >> > > I had thought that the previous tables only replicate packets to ports > other than the inport. But I may be wrong. > Some of my comments further down could be stupid because I may have not > understood the problem well. > > >> >> This patch fixes the issue by using a new register bit >> (MLF_NESTED_CONTAINER_BIT) >> instead of 'MLF_ALLOW_LOOPBACK_BIT' and sets it in REG10 for the packets >> received >> from child ports. >> >> Signed-off-by: Numan Siddique <nusid...@redhat.com> >> --- >> ovn/controller/ofctrl.c | 29 ++++++++++++++++++++--------- >> ovn/controller/ofctrl.h | 5 +++++ >> ovn/controller/physical.c | 38 ++++++++++++++++++++++++++++++++------ >> ovn/lib/logical-fields.h | 4 ++++ >> tests/ovn.at | 11 +++++++++++ >> 5 files changed, 72 insertions(+), 15 deletions(-) >> >> diff --git a/ovn/controller/ofctrl.c b/ovn/controller/ofctrl.c >> index 96c57f143..2f2b185ae 100644 >> --- a/ovn/controller/ofctrl.c >> +++ b/ovn/controller/ofctrl.c >> @@ -630,9 +630,11 @@ ofctrl_recv(const struct ofp_header *oh, enum >> ofptype type) >> * >> * The caller should initialize its own hmap to hold the flows. */ >> void >> -ofctrl_add_flow(struct hmap *desired_flows, >> - uint8_t table_id, uint16_t priority, uint64_t cookie, >> - const struct match *match, const struct ofpbuf *actions) >> +ofctrl_check_and_add_flow(struct hmap *desired_flows, >> + uint8_t table_id, uint16_t priority, uint64_t >> cookie, >> + const struct match *match, >> + const struct ofpbuf *actions, >> + bool log_duplicate_flow) >> { >> struct ovn_flow *f = xmalloc(sizeof *f); >> f->table_id = table_id; >> @@ -644,13 +646,14 @@ ofctrl_add_flow(struct hmap *desired_flows, >> f->cookie = cookie; >> >> if (ovn_flow_lookup(desired_flows, f)) { >> - static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5); >> - if (!VLOG_DROP_DBG(&rl)) { >> - char *s = ovn_flow_to_string(f); >> - VLOG_DBG("dropping duplicate flow: %s", s); >> - free(s); >> + if (log_duplicate_flow) { >> + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, >> 5); >> + if (!VLOG_DROP_DBG(&rl)) { >> + char *s = ovn_flow_to_string(f); >> + VLOG_DBG("dropping duplicate flow: %s", s); >> + free(s); >> + } >> } >> - >> ovn_flow_destroy(f); >> return; >> } >> @@ -658,6 +661,14 @@ ofctrl_add_flow(struct hmap *desired_flows, >> hmap_insert(desired_flows, &f->hmap_node, f->hmap_node.hash); >> } >> >> +void >> +ofctrl_add_flow(struct hmap *desired_flows, >> + uint8_t table_id, uint16_t priority, uint64_t cookie, >> + const struct match *match, const struct ofpbuf *actions) >> +{ >> + ofctrl_check_and_add_flow(desired_flows, table_id, priority, cookie, >> + match, actions, true); >> +} >> >> /* ovn_flow. */ >> >> diff --git a/ovn/controller/ofctrl.h b/ovn/controller/ofctrl.h >> index e3fc95b05..ae0cfa513 100644 >> --- a/ovn/controller/ofctrl.h >> +++ b/ovn/controller/ofctrl.h >> @@ -55,4 +55,9 @@ void ofctrl_add_flow(struct hmap *desired_flows, >> uint8_t table_id, >> uint16_t priority, uint64_t cookie, >> const struct match *, const struct ofpbuf *ofpacts); >> >> +void ofctrl_check_and_add_flow(struct hmap *desired_flows, uint8_t >> table_id, >> + uint16_t priority, uint64_t cookie, >> + const struct match *, >> + const struct ofpbuf *ofpacts, >> + bool log_duplicate_flow); >> #endif /* ovn/ofctrl.h */ >> diff --git a/ovn/controller/physical.c b/ovn/controller/physical.c >> index c38d7b09f..d781ae459 100644 >> --- a/ovn/controller/physical.c >> +++ b/ovn/controller/physical.c >> @@ -189,7 +189,8 @@ get_zone_ids(const struct sbrec_port_binding *binding, >> >> static void >> put_local_common_flows(uint32_t dp_key, uint32_t port_key, >> - bool nested_container, const struct zone_ids >> *zone_ids, >> + uint32_t parent_port_key, >> + const struct zone_ids *zone_ids, >> struct ofpbuf *ofpacts_p, struct hmap *flow_table) >> { >> struct match match; >> @@ -253,7 +254,7 @@ put_local_common_flows(uint32_t dp_key, uint32_t >> port_key, >> ofpbuf_clear(ofpacts_p); >> match_set_metadata(&match, htonll(dp_key)); >> match_set_reg(&match, MFF_LOG_OUTPORT - MFF_REG0, port_key); >> - if (!nested_container) { >> + if (!parent_port_key) { >> match_set_reg_masked(&match, MFF_LOG_FLAGS - MFF_REG0, >> MLF_ALLOW_LOOPBACK, MLF_ALLOW_LOOPBACK); >> } >> > I think before your patch, the above code would always save inport for > nested containers. They continue to do so now. I hope that was your > intention? > > > >> @@ -264,6 +265,25 @@ put_local_common_flows(uint32_t dp_key, uint32_t >> port_key, >> put_stack(MFF_IN_PORT, ofpact_put_STACK_POP(ofpacts_p)); >> ofctrl_add_flow(flow_table, OFTABLE_SAVE_INPORT, 100, 0, >> > > &match, ofpacts_p); >> > + >> > Can you add a comment here on what we are doing below? > > When a packet is headed to a nested container, the outport in OVN should > be that of the destination nested container. > But here it looks like we are matching on the OVN outport being the parent > port and saying that if the outport is parent port, we should save the > physical inport. > Is that what we are doing? I don't quite understand how this helps to > prevent packet from going back to the originator child port. I am sure I am > missing something simple here. > > + if (parent_port_key) { >> + match_init_catchall(&match); >> + ofpbuf_clear(ofpacts_p); >> + match_set_metadata(&match, htonll(dp_key)); >> + match_set_reg(&match, MFF_LOG_OUTPORT - MFF_REG0, >> parent_port_key); >> + match_set_reg_masked(&match, MFF_LOG_FLAGS - MFF_REG0, >> + MLF_NESTED_CONTAINER, MLF_NESTED_CONTAINER); >> + >> + put_stack(MFF_IN_PORT, ofpact_put_STACK_PUSH(ofpacts_p)); >> + put_load(0, MFF_IN_PORT, 0, 16, ofpacts_p); >> + put_resubmit(OFTABLE_LOG_TO_PHY, ofpacts_p); >> + put_stack(MFF_IN_PORT, ofpact_put_STACK_POP(ofpacts_p)); >> + /* When a parent port has multiple child ports, we don't want to >> + * log the duplicate flow message. >> + */ >> + ofctrl_check_and_add_flow(flow_table, OFTABLE_SAVE_INPORT, 100, >> 0, >> + &match, ofpacts_p, false); >> + } >> } >> >> static void >> @@ -328,7 +348,7 @@ consider_port_binding(struct ovsdb_idl_index >> *sbrec_chassis_by_name, >> } >> >> struct zone_ids binding_zones = get_zone_ids(binding, ct_zones); >> - put_local_common_flows(dp_key, port_key, false, &binding_zones, >> + put_local_common_flows(dp_key, port_key, 0, &binding_zones, >> ofpacts_p, flow_table); >> >> match_init_catchall(&match); >> @@ -452,6 +472,7 @@ consider_port_binding(struct ovsdb_idl_index >> *sbrec_chassis_by_name, >> >> int tag = 0; >> bool nested_container = false; >> + const struct sbrec_port_binding *parent_port = NULL; >> ofp_port_t ofport; >> bool is_remote = false; >> if (binding->parent_port && *binding->parent_port) { >> @@ -463,6 +484,8 @@ consider_port_binding(struct ovsdb_idl_index >> *sbrec_chassis_by_name, >> if (ofport) { >> tag = *binding->tag; >> nested_container = true; >> + parent_port = lport_lookup_by_name( >> + sbrec_port_binding_by_name, binding->parent_port); >> } >> } else { >> ofport = u16_to_ofp(simap_get(&localvif_to_ofport, >> @@ -523,7 +546,8 @@ consider_port_binding(struct ovsdb_idl_index >> *sbrec_chassis_by_name, >> */ >> >> struct zone_ids zone_ids = get_zone_ids(binding, ct_zones); >> - put_local_common_flows(dp_key, port_key, nested_container, >> &zone_ids, >> + uint32_t parent_port_key = parent_port ? parent_port->tunnel_key >> : 0; >> + put_local_common_flows(dp_key, port_key, parent_port_key, >> &zone_ids, >> ofpacts_p, flow_table); >> >> /* Table 0, Priority 150 and 100. >> @@ -553,8 +577,10 @@ consider_port_binding(struct ovsdb_idl_index >> *sbrec_chassis_by_name, >> if (nested_container) { >> /* When a packet comes from a container sitting behind a >> * parent_port, we should let it loopback to other >> containers >> - * or the parent_port itself. */ >> - put_load(MLF_ALLOW_LOOPBACK, MFF_LOG_FLAGS, 0, 1, >> ofpacts_p); >> + * or the parent_port itself. Indicate this by setting >> the >> + * MLF_NESTED_CONTAINER_BIT in MFF_LOG_FLAGS.*/ >> + put_load(1, MFF_LOG_FLAGS, MLF_NESTED_CONTAINER_BIT, 1, >> + ofpacts_p); >> } >> ofpact_put_STRIP_VLAN(ofpacts_p); >> } >> diff --git a/ovn/lib/logical-fields.h b/ovn/lib/logical-fields.h >> index b1dbb035a..ab31327e9 100644 >> --- a/ovn/lib/logical-fields.h >> +++ b/ovn/lib/logical-fields.h >> @@ -50,6 +50,7 @@ enum mff_log_flags_bits { >> MLF_FORCE_SNAT_FOR_DNAT_BIT = 2, >> MLF_FORCE_SNAT_FOR_LB_BIT = 3, >> MLF_LOCAL_ONLY_BIT = 4, >> + MLF_NESTED_CONTAINER_BIT = 5, >> }; >> >> /* MFF_LOG_FLAGS_REG flag assignments */ >> @@ -75,6 +76,9 @@ enum mff_log_flags { >> * hypervisors should instead only be output to local targets >> */ >> MLF_LOCAL_ONLY = (1 << MLF_LOCAL_ONLY_BIT), >> + >> + /* Indicate that a packet has received from a nested container. */ >> + MLF_NESTED_CONTAINER = (1 << MLF_NESTED_CONTAINER_BIT), >> }; >> >> #endif /* ovn/lib/logical-fields.h */ >> diff --git a/tests/ovn.at b/tests/ovn.at >> index 769e09f81..a7aba5ccd 100644 >> --- a/tests/ovn.at >> +++ b/tests/ovn.at >> @@ -7038,6 +7038,17 @@ >> packet=${dst_mac}${src_mac}8100000208004500001c000000003f110100${src_ip}${dst_ip >> echo $packet >> expected1 >> OVN_CHECK_PACKETS([hv1/vm1-tx.pcap], [expected1]) >> >> +# Send broadcast packet from foo1. foo1 should not receive the same >> packet. >> +src_mac="f00000010205" >> +dst_mac="ffffffffffff" >> +src_ip=`ip_to_hex 192 168 1 2` >> +dst_ip=`ip_to_hex 255 255 255 255` >> >> +packet=${dst_mac}${src_mac}8100000108004500001c0000000040110000${src_ip}${dst_ip}0035111100080000 >> +as hv1 ovs-appctl netdev-dummy/receive vm1 $packet >> + >> +# expected packet at VM1 >> +OVN_CHECK_PACKETS([hv1/vm1-tx.pcap], [expected1]) >> + >> OVN_CLEANUP([hv1],[hv2]) >> >> AT_CLEANUP >> -- >> 2.17.1 >> >> _______________________________________________ >> dev mailing list >> d...@openvswitch.org >> https://mail.openvswitch.org/mailman/listinfo/ovs-dev >> > _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev