Thansk for the questions.

the multipath_port can be set via ovn-nbctl.
Like : ovn-nbctl   -- --id=@lrt create Logical_Router_Static_Route
ip_prefix=0.0.0.0/0 nexthop=10.88.77.1 multipath_port=[mp1,mp2] -- add
Logical_Router edge1 static_routes @lrt
This patch haven't implement a ovn-nbctl command to configure multipath
routing. Because I am still considering reusing nexthop or output_port(make
them become array entries), and want to collect suggestions on it.

About the status of next -hop, I would like to introduce bundle_load and
bfd to make it later.

Thanks
Zhenyu Gao

2017-09-20 11:13 GMT+08:00 <wang.qia...@zte.com.cn>:

> How to configure multipath_port in static_route? I think the the multipath
> can be figured out from exist data of static_route, may not need to add
> this multipath_port column.
>
> And I think we should add a status column to indicate the nexthop state.
> When some of nexthop in multipath is down, ovn should change the
> correspond flows.
>
> Thanks.
>
>
>
>
>
> Zhenyu Gao <sysugaozhe...@gmail.com>
> 发件人: ovs-dev-boun...@openvswitch.org
> 2017/09/19 19:37
>
>         收件人:        b...@ovn.org, majop...@redhat.com,
> anilvenk...@redhat.com, russ...@ovn.org, d...@openvswitch.org,
>         抄送:
>         主题:  [ovs-dev] [PATCH v1 1/3] Add multipath static router in
> OVN northd      and north-db
>
>
> 1. ovn-nb.ovsschema was updated to add new field multipath_port.
> 2. Add multipath feature in ovn-northd part. northd generates multipath
> flows to dispatch traffic by using packet's IP dst address if user set
> Logical_Router_Static_Route's multipath_port with ports.
> 3. Add new table(lr_in_multipath) in ovn-northd's router ingress stages
> to dispatch traffic to ports.
> 4. Add multipath flow in Table 5(lr_in_ip_routing) and store hash result
> into reg0. reg9[2] was used to indicate packet which need dispatching.
> 5. Add multipath feature description in ovn/northd/ovn-northd.8.xml
> and ovn/ovn-nb.xml
>
> Signed-off-by: Zhenyu Gao <sysugaozhe...@gmail.com>
> ---
>  ovn/northd/ovn-northd.8.xml |  67 +++++++++++-
>  ovn/northd/ovn-northd.c     | 245
> ++++++++++++++++++++++++++++++++++++++------
>  ovn/ovn-nb.ovsschema        |   6 +-
>  ovn/ovn-nb.xml              |   9 ++
>  4 files changed, 289 insertions(+), 38 deletions(-)
>
> diff --git a/ovn/northd/ovn-northd.8.xml b/ovn/northd/ovn-northd.8.xml
> index 0d85ec0..b1ce9a9 100644
> --- a/ovn/northd/ovn-northd.8.xml
> +++ b/ovn/northd/ovn-northd.8.xml
> @@ -1598,6 +1598,9 @@ icmp4 {
>        port (ingress table <code>ARP Request</code> will generate an ARP
>        request, if needed, with <code>reg0</code> as the target protocol
>        address and <code>reg1</code> as the source protocol address).
> +      A IP route can be configured that it has multipath to next-hop.
> +      If a packet has multipath to destination, OVN assign the port
> +      index into reg[0] to indicate the packet's output port in table 6.
>      </p>
>
>      <p>
> @@ -1617,6 +1620,28 @@ icmp4 {
>
>        <li>
>          <p>
> +          IPv4/IPV6 multipath routing table. For each route to IPv4/IPv6
> +          network <var>N</var> with netmask <var>M</var>, on multipath
> port
> +          <var>P</var> with IP address <var>A</var> and Ethernet
> +          address <var>E</var>, a logical flow with match
> +          <code>ip4.dst ==<var>N</var>/<var>M</var></code>,whose priority
> +          is the number of 1-bits plus 10 in <var>M</var>,
> +          has the following actions:
> +        </p>
> +
> +        <pre>
> +ip.ttl--;
> +multipath (nw_dst, 0, modulo_n, <var>n_links</var>, 0, reg0);
> +reg9[2] = 1
> +next;
> +        </pre>
> +        <p>
> +          <var>n_links</var> is the number of multipath port.
> +        </p>
> +      </li>
> +
> +      <li>
> +        <p>
>            IPv4 routing table.  For each route to IPv4 network
> <var>N</var> with
>            netmask <var>M</var>, on router port <var>P</var> with IP
> address
>            <var>A</var> and Ethernet
> @@ -1686,7 +1711,43 @@ next;
>        </li>
>      </ul>
>
> -    <h3>Ingress Table 6: ARP/ND Resolution</h3>
> +    <h3>Ingress Table 6: Multipath</h3>
> +    <p>
> +      Any packet taht reaches this table is an IP packet and reg9[2]=1
> +      using the following flows to route to corresponding port. This
> table
> +      implement dispatching by consuming reg0.
> +    </p>
> +
> +    <ul>
> +      <li>
> +        <p>
> +          A packet with netmask <var>M</var>, IP address <var>A</var> and
> +          <code>reg9[2] = 1</code>, whose priority above 1 has following
> +          actions:
> +        </p>
> +
> +        <pre>
> +reg0 = <var>G</var>;
> +reg1 = <var>A</var>;
> +eth.src = <var>E</var>;
> +outport = <var>P</var>;
> +flags.loopback = 1;
> +next;
> +        </pre>
> +
> +        <p>
> +          <var>G</var> is the gateway IP address. <var>A</var>,
> <var>E</var>
> +          and <var>P</var> are the values that were described in
> multipath
> +          routeing in table 5
> +        </p>
> +
> +        <p>
> +          A priority-0 logical flow with match has actions
> <code>next;</code>.
> +        </p>
> +      </li>
> +    </ul>
> +
> +    <h3>Ingress Table 7: ARP/ND Resolution</h3>
>
>      <p>
>        Any packet that reaches this table is an IP packet whose next-hop
> @@ -1779,7 +1840,7 @@ next;
>        </li>
>      </ul>
>
> -    <h3>Ingress Table 7: Gateway Redirect</h3>
> +    <h3>Ingress Table 8: Gateway Redirect</h3>
>
>      <p>
>        For distributed logical routers where one of the logical router
> @@ -1836,7 +1897,7 @@ next;
>        </li>
>      </ul>
>
> -    <h3>Ingress Table 8: ARP Request</h3>
> +    <h3>Ingress Table 9: ARP Request</h3>
>
>      <p>
>        In the common case where the Ethernet destination has been
> resolved, this
> diff --git a/ovn/northd/ovn-northd.c b/ovn/northd/ovn-northd.c
> index 49e4ac3..44d1fd4 100644
> --- a/ovn/northd/ovn-northd.c
> +++ b/ovn/northd/ovn-northd.c
> @@ -135,9 +135,10 @@ enum ovn_stage {
>      PIPELINE_STAGE(ROUTER, IN,  UNSNAT,      3, "lr_in_unsnat")       \
>      PIPELINE_STAGE(ROUTER, IN,  DNAT,        4, "lr_in_dnat")         \
>      PIPELINE_STAGE(ROUTER, IN,  IP_ROUTING,  5, "lr_in_ip_routing")   \
> -    PIPELINE_STAGE(ROUTER, IN,  ARP_RESOLVE, 6, "lr_in_arp_resolve")  \
> -    PIPELINE_STAGE(ROUTER, IN,  GW_REDIRECT, 7, "lr_in_gw_redirect")  \
> -    PIPELINE_STAGE(ROUTER, IN,  ARP_REQUEST, 8, "lr_in_arp_request")  \
> +    PIPELINE_STAGE(ROUTER, IN,  MULTIPATH,   6, "lr_in_multipath")    \
> +    PIPELINE_STAGE(ROUTER, IN,  ARP_RESOLVE, 7, "lr_in_arp_resolve")  \
> +    PIPELINE_STAGE(ROUTER, IN,  GW_REDIRECT, 8, "lr_in_gw_redirect")  \
> +    PIPELINE_STAGE(ROUTER, IN,  ARP_REQUEST, 9, "lr_in_arp_request")  \
>                                                                        \
>      /* Logical router egress stages. */                               \
>      PIPELINE_STAGE(ROUTER, OUT, UNDNAT,    0, "lr_out_undnat")        \
> @@ -173,6 +174,11 @@ enum ovn_stage {
>   * one of the logical router's own IP addresses. */
>  #define REGBIT_EGRESS_LOOPBACK  "reg9[1]"
>
> +/* Indicate multipath action has process this packet and store hash
> result
> + * into other regX. Should consume the hash result to determin the right
> + * output port. */
> +#define REGBIT_MULTIPATH "reg9[2]"
> +
>  /* Returns an "enum ovn_stage" built from the arguments. */
>  static enum ovn_stage
>  ovn_stage_build(enum ovn_datapath_type dp_type, enum ovn_pipeline
> pipeline,
> @@ -4142,72 +4148,165 @@ add_route(struct hmap *lflows, const struct
> ovn_port *op,
>  }
>
>  static void
> -build_static_route_flow(struct hmap *lflows, struct ovn_datapath *od,
> -                        struct hmap *ports,
> -                        const struct nbrec_logical_router_static_route
> *route)
> +add_multipath_route(struct hmap *lflows, uint32_t port_num,
> +                    struct ovn_port **out_ports,
> +                    const char **lrp_addr_s,
> +                    struct ovn_datapath *od,
> +                    const char *network_s, int plen,
> +                    const char *gateway, const char *policy)
> +{
> +    bool is_ipv4 = strchr(network_s, '.') ? true : false;
> +    struct ds match = DS_EMPTY_INITIALIZER;
> +    const char *dir;
> +    uint16_t priority;
> +
> +    if (policy && !strcmp(policy, "src-ip")) {
> +        dir = "src";
> +        priority = plen * 2;
> +    } else {
> +        dir = "dst";
> +        priority = (plen * 2) + 1;
> +    }
> +
> +    /* Set higer priority than regular route. */
> +    priority += 10;
> +
> +    ds_put_format(&match, "ip%s.%s == %s/%d", is_ipv4 ? "4" : "6", dir,
> +                  network_s, plen);
> +
> +    struct ds actions = DS_EMPTY_INITIALIZER;
> +
> +    ds_put_format(&actions, "ip.ttl--; ");
> +    ds_put_format(&actions,
> +                  "multipath (nw_dst, 0, modulo_n, %u, 0, reg0); "
> +                  "%s = 1; "
> +                  "next;",
> +                  port_num, REGBIT_MULTIPATH);
> +
> +    /* The priority here is calculated to implement longest-prefix-match
> +     * routing. */
> +    ovn_lflow_add(lflows, od, S_ROUTER_IN_IP_ROUTING, priority,
> +                  ds_cstr(&match), ds_cstr(&actions));
> +
> +    for (int i = 0; i < port_num; i++) {
> +        struct ds mp_match = DS_EMPTY_INITIALIZER;
> +        struct ds mp_actions = DS_EMPTY_INITIALIZER;
> +
> +        ds_put_format(&mp_match, "%s == 1 && reg0 == %d && ",
> +                      REGBIT_MULTIPATH, i);
> +        ds_put_format(&mp_match, "ip%s.%s == %s/%d",
> +                      is_ipv4 ? "4" : "6", dir,
> +                      network_s, plen);
> +
> +        ds_put_format(&mp_actions, "%sreg0 = ", is_ipv4 ? "" : "xx");
> +        if (gateway) {
> +            ds_put_cstr(&mp_actions, gateway);
> +        } else {
> +            ds_put_format(&mp_actions, "ip%s.dst", is_ipv4 ? "4" : "6");
> +        }
> +
> +        ds_put_format(&mp_actions, "; "
> +                      "%sreg1 = %s; "
> +                      "eth.src = %s; "
> +                      "outport = %s; "
> +                      "flags.loopback = 1; "
> +                      "next;",
> +                      is_ipv4 ? "" : "xx",
> +                      lrp_addr_s[i],
> +                      out_ports[i]->lrp_networks.ea_s,
> +                      out_ports[i]->json_key);
> +
> +        /* Add flow in table 6 to determin the right output port
> +         * for this traffic. */
> +        ovn_lflow_add(lflows, od, S_ROUTER_IN_MULTIPATH, priority,
> +                      ds_cstr(&mp_match), ds_cstr(&mp_actions));
> +        ds_destroy(&mp_match);
> +        ds_destroy(&mp_actions);
> +    }
> +    ds_destroy(&match);
> +    ds_destroy(&actions);
> +}
> +
> +static bool
> +verify_nexthop_prefix(const struct nbrec_logical_router_static_route
> *route,
> +                      bool *is_ipv4, char **prefix_s, unsigned int *plen)
>  {
>      ovs_be32 nexthop;
> -    const char *lrp_addr_s = NULL;
> -    unsigned int plen;
> -    bool is_ipv4;
>
>      /* Verify that the next hop is an IP address with an all-ones mask.
> */
> -    char *error = ip_parse_cidr(route->nexthop, &nexthop, &plen);
> +    char *error = ip_parse_cidr(route->nexthop, &nexthop, plen);
>      if (!error) {
> -        if (plen != 32) {
> +        if (*plen != 32) {
>              static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5,
> 1);
>              VLOG_WARN_RL(&rl, "bad next hop mask %s", route->nexthop);
> -            return;
> +            return false;
>          }
> -        is_ipv4 = true;
> +        *is_ipv4 = true;
>      } else {
>          free(error);
>
>          struct in6_addr ip6;
> -        error = ipv6_parse_cidr(route->nexthop, &ip6, &plen);
> +        error = ipv6_parse_cidr(route->nexthop, &ip6, plen);
>          if (!error) {
> -            if (plen != 128) {
> +            if (*plen != 128) {
>                  static struct vlog_rate_limit rl =
> VLOG_RATE_LIMIT_INIT(5, 1);
>                  VLOG_WARN_RL(&rl, "bad next hop mask %s",
> route->nexthop);
> -                return;
> +                return false;
>              }
> -            is_ipv4 = false;
> +            *is_ipv4 = false;
>          } else {
>              static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5,
> 1);
>              VLOG_WARN_RL(&rl, "bad next hop ip address %s",
> route->nexthop);
>              free(error);
> -            return;
> +            return false;
>          }
>      }
>
> -    char *prefix_s;
> -    if (is_ipv4) {
> +    if (*is_ipv4) {
>          ovs_be32 prefix;
>          /* Verify that ip prefix is a valid IPv4 address. */
> -        error = ip_parse_cidr(route->ip_prefix, &prefix, &plen);
> +        error = ip_parse_cidr(route->ip_prefix, &prefix, plen);
>          if (error) {
>              static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5,
> 1);
>              VLOG_WARN_RL(&rl, "bad 'ip_prefix' in static routes %s",
>                           route->ip_prefix);
>              free(error);
> -            return;
> +            return false;
>          }
> -        prefix_s = xasprintf(IP_FMT, IP_ARGS(prefix &
> be32_prefix_mask(plen)));
> +        *prefix_s = xasprintf(IP_FMT, IP_ARGS(prefix
> +                                              &
> be32_prefix_mask(*plen)));
>      } else {
>          /* Verify that ip prefix is a valid IPv6 address. */
>          struct in6_addr prefix;
> -        error = ipv6_parse_cidr(route->ip_prefix, &prefix, &plen);
> +        error = ipv6_parse_cidr(route->ip_prefix, &prefix, plen);
>          if (error) {
>              static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5,
> 1);
>              VLOG_WARN_RL(&rl, "bad 'ip_prefix' in static routes %s",
>                           route->ip_prefix);
>              free(error);
> -            return;
> +            return false;
>          }
> -        struct in6_addr mask = ipv6_create_mask(plen);
> +        struct in6_addr mask = ipv6_create_mask(*plen);
>          struct in6_addr network = ipv6_addr_bitand(&prefix, &mask);
> -        prefix_s = xmalloc(INET6_ADDRSTRLEN);
> -        inet_ntop(AF_INET6, &network, prefix_s, INET6_ADDRSTRLEN);
> +        *prefix_s = xmalloc(INET6_ADDRSTRLEN);
> +        inet_ntop(AF_INET6, &network, *prefix_s, INET6_ADDRSTRLEN);
> +    }
> +
> +    return true;
> +}
> +
> +static void
> +build_static_route_flow(struct hmap *lflows, struct ovn_datapath *od,
> +                        struct hmap *ports,
> +                        const struct nbrec_logical_router_static_route
> *route)
> +{
> +    const char *lrp_addr_s = NULL;
> +    unsigned int plen;
> +    bool is_ipv4;
> +    char *prefix_s = NULL;
> +
> +    if (!verify_nexthop_prefix(route, &is_ipv4, &prefix_s, &plen)) {
> +        return;
>      }
>
>      /* Find the outgoing port. */
> @@ -4270,7 +4369,75 @@ build_static_route_flow(struct hmap *lflows, struct
> ovn_datapath *od,
>                policy);
>
>  free_prefix_s:
> -    free(prefix_s);
> +    if (prefix_s) {
> +        free(prefix_s);
> +    }
> +}
> +
> +static void
> +build_multipath_flow(struct hmap *lflows, struct ovn_datapath *od,
> +                     struct hmap *ports,
> +                     const struct nbrec_logical_router_static_route
> *route)
> +{
> +    unsigned int plen;
> +    bool is_ipv4;
> +    char *prefix_s = NULL;
> +
> +    if (!verify_nexthop_prefix(route, &is_ipv4, &prefix_s, &plen)) {
> +        return;
> +    }
> +
> +    /* Find the outgoing port. */
> +    struct ovn_port **out_ports = xmalloc(route->n_multipath_port *
> +                                             sizeof(struct ovn_port *));
> +    const char **lrp_addr_s = xmalloc(route->n_multipath_port *
> +                                         sizeof(const char *));
> +    for (int i = 0; i < route->n_multipath_port; i++) {
> +        // TODO May need to consider some ports are not found?
> +        out_ports[i] = ovn_port_find(ports, route->multipath_port[i]);
> +        if (!out_ports[i]) {
> +            static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5,
> 1);
> +            VLOG_WARN_RL(&rl, "Bad out port %s for static route %s",
> +                         route->multipath_port[i], route->ip_prefix);
> +            goto free_ports_lrp_addr;
> +        }
> +
> +        lrp_addr_s[i] = find_lrp_member_ip(out_ports[i], route->nexthop);
> +        if (!lrp_addr_s[i]) {
> +            if (is_ipv4) {
> +                if (out_ports[i]->lrp_networks.n_ipv4_addrs) {
> +                    lrp_addr_s[i] = out_ports[i]->
> + lrp_networks.ipv4_addrs[0].addr_s;
> +                }
> +            } else {
> +                if (out_ports[i]->lrp_networks.n_ipv6_addrs) {
> +                    lrp_addr_s[i] = out_ports[i]->
> + lrp_networks.ipv6_addrs[0].addr_s;
> +                }
> +            }
> +        }
> +        if (!lrp_addr_s[i]) {
> +            static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5,
> 1);
> +            VLOG_WARN_RL(&rl,
> +                         "%s has no path for static route %s; next hop
> %s",
> +                         route->multipath_port[i], route->ip_prefix,
> +                         route->nexthop);
> +            goto free_ports_lrp_addr;
> +        }
> +    }
> +
> +
> +    char *policy = route->policy ? route->policy : "dst-ip";
> +    add_multipath_route(lflows, route->n_multipath_port,
> +                        out_ports, lrp_addr_s, od,
> +                        prefix_s, plen, route->nexthop, policy);
> +
> +free_ports_lrp_addr:
> +    free(out_ports);
> +    free(lrp_addr_s);
> +    if (prefix_s) {
> +        free(prefix_s);
> +    }
>  }
>
>  static void
> @@ -5344,7 +5511,7 @@ build_lrouter_flows(struct hmap *datapaths, struct
> hmap *ports,
>          }
>      }
>
> -    /* Convert the static routes to flows. */
> +    /* Convert the static routes and multipath route to flows. */
>      HMAP_FOR_EACH (od, key_node, datapaths) {
>          if (!od->nbr) {
>              continue;
> @@ -5355,12 +5522,24 @@ build_lrouter_flows(struct hmap *datapaths, struct
> hmap *ports,
>
>              route = od->nbr->static_routes[i];
>              build_static_route_flow(lflows, od, ports, route);
> +            /* Logical router ingress table 5-6: Multipath Routing.
> +             *
> +             * If router has configured a traffic has multiple paths
> +             * to destination. The right output port should be firgured
> +             * out by computing IP packet's header */
> +            if (route->n_multipath_port > 1) {
> +                /* Generate multipath routes in table 5,6 for
> +                 * dedicated traffic */
> +                build_multipath_flow(lflows, od, ports, route);
> +            }
>          }
> +        /* Packets are allowed by default in table 6. */
> +        ovn_lflow_add(lflows, od, S_ROUTER_IN_MULTIPATH, 0, "1",
> "next;");
>      }
>
>      /* XXX destination unreachable */
>
> -    /* Local router ingress table 6: ARP Resolution.
> +    /* Local router ingress table 7: ARP Resolution.
>       *
>       * Any packet that reaches this table is an IP packet whose next-hop
> IP
>       * address is in reg0. (ip4.dst is the final destination.) This table
> @@ -5555,7 +5734,7 @@ build_lrouter_flows(struct hmap *datapaths, struct
> hmap *ports,
>                        "get_nd(outport, xxreg0); next;");
>      }
>
> -    /* Logical router ingress table 7: Gateway redirect.
> +    /* Logical router ingress table 8: Gateway redirect.
>       *
>       * For traffic with outport equal to the l3dgw_port
>       * on a distributed router, this table redirects a subset
> @@ -5595,7 +5774,7 @@ build_lrouter_flows(struct hmap *datapaths, struct
> hmap *ports,
>          ovn_lflow_add(lflows, od, S_ROUTER_IN_GW_REDIRECT, 0, "1",
> "next;");
>      }
>
> -    /* Local router ingress table 8: ARP request.
> +    /* Local router ingress table 9: ARP request.
>       *
>       * In the common case where the Ethernet destination has been
> resolved,
>       * this table outputs the packet (priority 0).  Otherwise, it
> composes
> diff --git a/ovn/ovn-nb.ovsschema b/ovn/ovn-nb.ovsschema
> index a077bfb..b8bdd42 100644
> --- a/ovn/ovn-nb.ovsschema
> +++ b/ovn/ovn-nb.ovsschema
> @@ -1,7 +1,7 @@
>  {
>      "name": "OVN_Northbound",
>      "version": "5.8.0",
> -    "cksum": "2812300190 16766",
> +    "cksum": "1967092589 16903",
>      "tables": {
>          "NB_Global": {
>              "columns": {
> @@ -235,7 +235,9 @@
>                                                               "dst-ip"]]},
>                                      "min": 0, "max": 1}},
>                  "nexthop": {"type": "string"},
> -                "output_port": {"type": {"key": "string", "min": 0,
> "max": 1}}},
> +                "output_port": {"type": {"key": "string", "min": 0,
> "max": 1}},
> +                "multipath_port": {"type": {"key": "string", "min": 0,
> +                                            "max": "unlimited"}}},
>              "isRoot": false},
>          "NAT": {
>              "columns": {
> diff --git a/ovn/ovn-nb.xml b/ovn/ovn-nb.xml
> index 9869d7e..15feb97 100644
> --- a/ovn/ovn-nb.xml
> +++ b/ovn/ovn-nb.xml
> @@ -1487,6 +1487,15 @@
>          address as the one via which the <ref column="nexthop"/> is
> reachable.
>        </p>
>      </column>
> +    <column name="multipath_port">
> +      <p>
> +        The name of the <ref table="Logical_Router_Port"/> via which the
> packet
> +        needs to be sent out. When it contains more than two ports, it
> means
> +        packet has multiple candidate output ports. OVN uses the packet
> header
> +        to determin which port the packet would be delivered to.
> +        Currently, OVN consumes destination IP address to figure out
> port.
> +      </p>
> +    </column>
>    </table>
>
>    <table name="NAT" title="NAT rules">
> --
> 1.8.3.1
>
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