[ovs-dev] [PATCH ovn v12 2/7] ovn-controller: I-P for ct zone and OVS interface changes in flow output stage.

Numan Siddique numans at ovn.org
Fri Jun 19 08:09:09 UTC 2020


On Fri, Jun 19, 2020 at 1:11 PM Dumitru Ceara <dceara at redhat.com> wrote:

> On 6/11/20 2:43 PM, numans at ovn.org wrote:
> > From: Numan Siddique <numans at ovn.org>
> >
> > This patch handles ct zone changes and OVS interface changes
> incrementally
> > in the flow output stage.
> >
> > Any changes to ct zone can be handled by running physical_run() instead
> of running
> > flow_output_run(). And any changes to OVS interfaces can be either
> handled
> > incrementally (for OVS interfaces representing VIFs) or just running
> > physical_run() (for tunnel and other types of interfaces).
> >
> > To better handle this, a new engine node 'physical_flow_changes' is
> added which
> > handles changes to ct zone and OVS interfaces.
> >
> > Signed-off-by: Numan Siddique <numans at ovn.org>
>
> Hi Numan,
>
> I have a few comments on this patch. Please see below.
>
> > ---
> >  controller/binding.c        |  23 +-----
> >  controller/binding.h        |  24 ++++++-
> >  controller/ovn-controller.c | 136 +++++++++++++++++++++++++++++++++++-
> >  controller/physical.c       |  51 ++++++++++++++
> >  controller/physical.h       |   5 +-
> >  5 files changed, 214 insertions(+), 25 deletions(-)
> >
> > diff --git a/controller/binding.c b/controller/binding.c
> > index 06ecb93fb..67fd2777f 100644
> > --- a/controller/binding.c
> > +++ b/controller/binding.c
> > @@ -535,7 +535,7 @@ remove_local_lport_ids(struct binding_ctx_out *b_ctx,
> >   * 'struct local_binding' is used. A shash of these local bindings is
> >   * maintained with the 'external_ids:iface-id' as the key to the shash.
> >   *
> > - * struct local_binding has 3 main fields:
> > + * struct local_binding (defined in binding.h) has 3 main fields:
> >   *    - type
> >   *    - OVS interface row object
> >   *    - Port_Binding row object
> > @@ -586,21 +586,6 @@ remove_local_lport_ids(struct binding_ctx_out
> *b_ctx,
> >   *   - For each 'virtual' Port Binding (of type BT_VIRTUAL) provided
> its parent
> >   *     is bound to this chassis.
> >   */
> > -enum local_binding_type {
> > -    BT_VIF,
> > -    BT_CONTAINER,
> > -    BT_VIRTUAL
> > -};
> > -
> > -struct local_binding {
> > -    char *name;
> > -    enum local_binding_type type;
> > -    const struct ovsrec_interface *iface;
> > -    const struct sbrec_port_binding *pb;
> > -
> > -    /* shash of 'struct local_binding' representing children. */
> > -    struct shash children;
> > -};
> >
> >  static struct local_binding *
> >  local_binding_create(const char *name, const struct ovsrec_interface
> *iface,
> > @@ -622,12 +607,6 @@ local_binding_add(struct shash *local_bindings,
> struct local_binding *lbinding)
> >      shash_add(local_bindings, lbinding->name, lbinding);
> >  }
> >
> > -static struct local_binding *
> > -local_binding_find(struct shash *local_bindings, const char *name)
> > -{
> > -    return shash_find_data(local_bindings, name);
> > -}
> > -
> >  static void
> >  local_binding_destroy(struct local_binding *lbinding)
> >  {
> > diff --git a/controller/binding.h b/controller/binding.h
> > index 9214a7479..161766d2f 100644
> > --- a/controller/binding.h
> > +++ b/controller/binding.h
> > @@ -18,6 +18,7 @@
> >  #define OVN_BINDING_H 1
> >
> >  #include <stdbool.h>
> > +#include "openvswitch/shash.h"
> >
> >  struct hmap;
> >  struct ovsdb_idl;
> > @@ -32,7 +33,6 @@ struct sbrec_chassis;
> >  struct sbrec_port_binding_table;
> >  struct sset;
> >  struct sbrec_port_binding;
> > -struct shash;
> >
> >  struct binding_ctx_in {
> >      struct ovsdb_idl_txn *ovnsb_idl_txn;
> > @@ -77,6 +77,28 @@ struct binding_ctx_out {
> >      struct smap *local_iface_ids;
> >  };
> >
> > +enum local_binding_type {
> > +    BT_VIF,
> > +    BT_CONTAINER,
> > +    BT_VIRTUAL
> > +};
> > +
> > +struct local_binding {
> > +    char *name;
> > +    enum local_binding_type type;
> > +    const struct ovsrec_interface *iface;
> > +    const struct sbrec_port_binding *pb;
> > +
> > +    /* shash of 'struct local_binding' representing children. */
> > +    struct shash children;
> > +};
> > +
> > +static inline struct local_binding *
> > +local_binding_find(struct shash *local_bindings, const char *name)
> > +{
> > +    return shash_find_data(local_bindings, name);
> > +}
> > +
> >  void binding_register_ovs_idl(struct ovsdb_idl *);
> >  void binding_run(struct binding_ctx_in *, struct binding_ctx_out *);
> >  bool binding_cleanup(struct ovsdb_idl_txn *ovnsb_idl_txn,
> > diff --git a/controller/ovn-controller.c b/controller/ovn-controller.c
> > index bf7214e45..6e66705da 100644
> > --- a/controller/ovn-controller.c
> > +++ b/controller/ovn-controller.c
> > @@ -1368,6 +1368,10 @@ static void init_physical_ctx(struct engine_node
> *node,
> >
> >      ovs_assert(br_int && chassis);
> >
> > +    struct ovsrec_interface_table *iface_table =
> > +        (struct ovsrec_interface_table *)EN_OVSDB_GET(
> > +            engine_get_input("OVS_interface", node));
> > +
> >      struct ed_type_ct_zones *ct_zones_data =
> >          engine_get_input_data("ct_zones", node);
> >      struct simap *ct_zones = &ct_zones_data->current;
> > @@ -1377,12 +1381,14 @@ static void init_physical_ctx(struct engine_node
> *node,
> >      p_ctx->mc_group_table = multicast_group_table;
> >      p_ctx->br_int = br_int;
> >      p_ctx->chassis_table = chassis_table;
> > +    p_ctx->iface_table = iface_table;
> >      p_ctx->chassis = chassis;
> >      p_ctx->active_tunnels = &rt_data->active_tunnels;
> >      p_ctx->local_datapaths = &rt_data->local_datapaths;
> >      p_ctx->local_lports = &rt_data->local_lports;
> >      p_ctx->ct_zones = ct_zones;
> >      p_ctx->mff_ovn_geneve = ed_mff_ovn_geneve->mff_ovn_geneve;
> > +    p_ctx->local_bindings = &rt_data->local_bindings;
> >  }
> >
> >  static void init_lflow_ctx(struct engine_node *node,
> > @@ -1790,6 +1796,118 @@ flow_output_port_groups_handler(struct
> engine_node *node, void *data)
> >      return _flow_output_resource_ref_handler(node, data,
> REF_TYPE_PORTGROUP);
> >  }
> >
> > +/* Engine node en_physical_flow_changes indicates whether
> > + * there is a need to
> > + *   - recompute only physical flows or
> > + *   - we can incrementally process the physical flows.
> > + *
> > + * en_physical_flow_changes is an input to flow_output engine node.
> > + * If the engine node 'en_physical_flow_changes' gets updated during
> > + * engine run, it means the handler for this -
> > + * flow_output_physical_flow_changes_handler() will either
> > + *    - recompute the physical flows by calling 'physical_run() or
> > + *    - incrementlly process some of the changes for physical flow
> > + *      calculation. Right now we handle OVS interfaces changes
> > + *      for physical flow computation.
> > + *
> > + * When ever a port binding happens, the follow up
> > + * activity is the zone id allocation for that port binding.
> > + * With this intermediate engine node, we avoid full recomputation.
> > + * Instead we do physical flow computation (either full recomputation
> > + * by calling physical_run() or handling the changes incrementally.
> > + *
> > + * Hence this is an intermediate engine node to indicate the
> > + * flow_output engine to recomputes/compute the physical flows.
> > + *
> > + * TODO 1. Ideally this engine node should recompute/compute the
> physical
> > + *      flows instead of relegating it to the flow_output node.
> > + *      But this requires splitting the flow_output node to
> > + *      logical_flow_output and physical_flow_output.
> > + *
> > + * TODO 2. We can further optimise the en_ct_zone changes to
> > + *         compute the phsyical flows for changed zone ids.
> > + *
> > + * TODO 3: physical.c has a global simap -localvif_to_ofport which
> stores the
> > + *         local OVS interfaces and the ofport numbers. Ideally this
> should be
> > + *         part of the engine data.
>
> Nit: inconsistent indentation with TODO 1 above.
>

Ack. I'll fix it.



>
> > + */
> > +struct ed_type_pfc_data {
> > +    /* Both these variables are tracked and set in each engine run. */
> > +    bool recompute_physical_flows;
> > +    bool ovs_ifaces_changed;
> > +};
> > +
> > +static void
> > +en_physical_flow_changes_clear_tracked_data(void *data_)
> > +{
> > +    struct ed_type_pfc_data *data = data_;
> > +    data->recompute_physical_flows = false;
> > +    data->ovs_ifaces_changed = false;
> > +}
> > +
> > +static void *
> > +en_physical_flow_changes_init(struct engine_node *node OVS_UNUSED,
> > +                              struct engine_arg *arg OVS_UNUSED)
> > +{
> > +    struct ed_type_pfc_data *data = xzalloc(sizeof *data);
> > +    return data;
> > +}
> > +
> > +static void
> > +en_physical_flow_changes_cleanup(void *data OVS_UNUSED)
> > +{
> > +}
> > +
> > +/* Indicate to the flow_output engine that we need to recompute physical
> > + * flows. */
> > +static void
> > +en_physical_flow_changes_run(struct engine_node *node, void *data)
> > +{
> > +    struct ed_type_pfc_data *pfc_tdata = data;
> > +    pfc_tdata->recompute_physical_flows = true;
> > +    engine_set_node_state(node, EN_UPDATED);
> > +}
> > +
> > +/* There are OVS interface changes. Indicate to the flow_output engine
> > + * to handle these OVS interface changes for physical flow
> computations. */
> > +static bool
> > +physical_flow_changes_ovs_iface_handler(struct engine_node *node, void
> *data)
> > +{
> > +    struct ed_type_pfc_data *pfc_tdata = data;
> > +    pfc_tdata->ovs_ifaces_changed = true;
> > +    engine_set_node_state(node, EN_UPDATED);
> > +    return true;
> > +}
> > +
> > +static bool
> > +flow_output_physical_flow_changes_handler(struct engine_node *node,
> void *data)
>
> Nit: I think this function should be moved above, in the section where
> we define all the flow_output_*_handler() input handlers, e.g., after
> flow_output_port_groups_handler().
>

If we move it there, we also need to move the "struct  ed_type_pfc_data"
definition above
this function. That's why I put it at the end.


> > +{
> > +    struct ed_type_runtime_data *rt_data =
> > +        engine_get_input_data("runtime_data", node);
> > +
> > +    struct ed_type_flow_output *fo = data;
> > +    struct physical_ctx p_ctx;
> > +    init_physical_ctx(node, rt_data, &p_ctx);
> > +
> > +    engine_set_node_state(node, EN_UPDATED);
> > +    struct ed_type_pfc_data *pfc_data =
> > +        engine_get_input_data("physical_flow_changes", node);
> > +
> > +    if (pfc_data->recompute_physical_flows) {
> > +        /* This indicates that we need to recompute the physical flows.
> */
> > +        physical_run(&p_ctx, &fo->flow_table);
> > +        return true;
> > +    }
> > +
> > +    if (pfc_data->ovs_ifaces_changed) {
> > +        /* There are OVS interface changes. Try to handle them
> > +         * incrementally. */
> > +        return physical_handle_ovs_iface_changes(&p_ctx,
> &fo->flow_table);
> > +    }
> > +
> > +    return true;
> > +}
> > +
> >  struct ovn_controller_exit_args {
> >      bool *exiting;
> >      bool *restart;
> > @@ -1914,6 +2032,8 @@ main(int argc, char *argv[])
> >      ENGINE_NODE(runtime_data, "runtime_data");
> >      ENGINE_NODE(mff_ovn_geneve, "mff_ovn_geneve");
> >      ENGINE_NODE(ofctrl_is_connected, "ofctrl_is_connected");
> > +    ENGINE_NODE_WITH_CLEAR_TRACK_DATA(physical_flow_changes,
> > +                                      "physical_flow_changes");
> >      ENGINE_NODE(flow_output, "flow_output");
> >      ENGINE_NODE(addr_sets, "addr_sets");
> >      ENGINE_NODE(port_groups, "port_groups");
> > @@ -1933,13 +2053,27 @@ main(int argc, char *argv[])
> >      engine_add_input(&en_port_groups, &en_sb_port_group,
> >                       port_groups_sb_port_group_handler);
> >
> > +    /* Engine node physical_flow_changes indicates whether
> > +     * we can recompute only physical flows or we can
> > +     * incrementally process the physical flows.
> > +     */
> > +    engine_add_input(&en_physical_flow_changes, &en_ct_zones,
> > +                     NULL);
> > +    engine_add_input(&en_physical_flow_changes, &en_ovs_interface,
> > +                     physical_flow_changes_ovs_iface_handler);
> > +
> >      engine_add_input(&en_flow_output, &en_addr_sets,
> >                       flow_output_addr_sets_handler);
> >      engine_add_input(&en_flow_output, &en_port_groups,
> >                       flow_output_port_groups_handler);
> >      engine_add_input(&en_flow_output, &en_runtime_data, NULL);
> > -    engine_add_input(&en_flow_output, &en_ct_zones, NULL);
> >      engine_add_input(&en_flow_output, &en_mff_ovn_geneve, NULL);
> > +    engine_add_input(&en_flow_output, &en_physical_flow_changes,
> > +                     flow_output_physical_flow_changes_handler);
> > +
> > +    /* We need this input nodes for only data. Hence the noop handler.
> */
> > +    engine_add_input(&en_flow_output, &en_ct_zones,
> engine_noop_handler);
> > +    engine_add_input(&en_flow_output, &en_ovs_interface,
> engine_noop_handler);
> >
> >      engine_add_input(&en_flow_output, &en_ovs_open_vswitch, NULL);
> >      engine_add_input(&en_flow_output, &en_ovs_bridge, NULL);
> > diff --git a/controller/physical.c b/controller/physical.c
> > index f06313b9d..240ec158e 100644
> > --- a/controller/physical.c
> > +++ b/controller/physical.c
> > @@ -1780,6 +1780,57 @@ physical_run(struct physical_ctx *p_ctx,
> >      simap_destroy(&new_tunnel_to_ofport);
> >  }
> >
> > +bool
> > +physical_handle_ovs_iface_changes(struct physical_ctx *p_ctx,
> > +                                  struct ovn_desired_flow_table
> *flow_table)
> > +{
> > +    const struct ovsrec_interface *iface_rec;
> > +    OVSREC_INTERFACE_TABLE_FOR_EACH_TRACKED (iface_rec,
> p_ctx->iface_table) {
> > +        if (!strcmp(iface_rec->type, "geneve") ||
> > +            !strcmp(iface_rec->type, "patch")) {
> > +            return false;
>
> What about iface types "vxlan", "stt"? Shouldn't those be treated in the
> same way as "geneve"?
>

Thanks. I think we should add that check too.

I'll add it

Thanks
Numan


>
> Thanks,
> Dumitru
>
> > +        }
> > +    }
> > +
> > +    struct ofpbuf ofpacts;
> > +    ofpbuf_init(&ofpacts, 0);
> > +
> > +    OVSREC_INTERFACE_TABLE_FOR_EACH_TRACKED (iface_rec,
> p_ctx->iface_table) {
> > +        const char *iface_id = smap_get(&iface_rec->external_ids,
> "iface-id");
> > +        if (!iface_id) {
> > +            continue;
> > +        }
> > +
> > +        const struct local_binding *lb =
> > +            local_binding_find(p_ctx->local_bindings, iface_id);
> > +
> > +        if (!lb || !lb->pb) {
> > +            continue;
> > +        }
> > +
> > +        int64_t ofport = iface_rec->n_ofport ? *iface_rec->ofport : 0;
> > +        if (ovsrec_interface_is_deleted(iface_rec)) {
> > +            ofctrl_remove_flows(flow_table, &lb->pb->header_.uuid);
> > +            simap_find_and_delete(&localvif_to_ofport, iface_id);
> > +        } else {
> > +            if (!ovsrec_interface_is_new(iface_rec)) {
> > +                ofctrl_remove_flows(flow_table, &lb->pb->header_.uuid);
> > +            }
> > +
> > +            simap_put(&localvif_to_ofport, iface_id, ofport);
> > +            consider_port_binding(p_ctx->sbrec_port_binding_by_name,
> > +                                  p_ctx->mff_ovn_geneve,
> p_ctx->ct_zones,
> > +                                  p_ctx->active_tunnels,
> > +                                  p_ctx->local_datapaths,
> > +                                  lb->pb, p_ctx->chassis,
> > +                                  flow_table, &ofpacts);
> > +        }
> > +    }
> > +
> > +    ofpbuf_uninit(&ofpacts);
> > +    return true;
> > +}
> > +
> >  bool
> >  get_tunnel_ofport(const char *chassis_name, char *encap_ip, ofp_port_t
> *ofport)
> >  {
> > diff --git a/controller/physical.h b/controller/physical.h
> > index dadf84ea1..9ca34436a 100644
> > --- a/controller/physical.h
> > +++ b/controller/physical.h
> > @@ -49,11 +49,13 @@ struct physical_ctx {
> >      const struct ovsrec_bridge *br_int;
> >      const struct sbrec_chassis_table *chassis_table;
> >      const struct sbrec_chassis *chassis;
> > +    const struct ovsrec_interface_table *iface_table;
> >      const struct sset *active_tunnels;
> >      struct hmap *local_datapaths;
> >      struct sset *local_lports;
> >      const struct simap *ct_zones;
> >      enum mf_field_id mff_ovn_geneve;
> > +    struct shash *local_bindings;
> >  };
> >
> >  void physical_register_ovs_idl(struct ovsdb_idl *);
> > @@ -63,7 +65,8 @@ void physical_handle_port_binding_changes(struct
> physical_ctx *,
> >                                            struct ovn_desired_flow_table
> *);
> >  void physical_handle_mc_group_changes(struct physical_ctx *,
> >                                        struct ovn_desired_flow_table *);
> > -
> > +bool physical_handle_ovs_iface_changes(struct physical_ctx *,
> > +                                       struct ovn_desired_flow_table *);
> >  bool get_tunnel_ofport(const char *chassis_name, char *encap_ip,
> >                         ofp_port_t *ofport);
> >  #endif /* controller/physical.h */
> >
>
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