[ovs-dev] [PATCH 1/2] ovn: Support port groups in ACLs

Mark Michelson mmichels at redhat.com
Thu Mar 1 23:49:41 UTC 2018


Hi Han,

Current criticisms notwithstanding, I decided to test your patch with a 
scenario that I thought it would help with.

The base scenario is that I create an address set with 1000 addresses in 
it. I then create logical switch ports and create a new ACL for each port:

ovn-nbctl acl-add ls0 to-lport 1000 "outport == \"lsp${COUNT}\" && 
ip4.dst == \$set1" allow

The idea is that I'm creating a bunch of ACLs with identical L3 
restrictions but with different ports. I ran this using the 'time' 
utility, and here's the results:

For 100 ports: 2m17.979s
For 200 ports: 9m29.771s

The big reason for this is that the ACLs generate a lot of flows. For 
100 ports, it generates 102501 flows in table 44 (ACL egress table). For 
200 ports, it generates 205001 flows in that table. Dobuling the number 
of ports doubles the number of flows. And doubling the number of flows 
quadruples the amount of time it takes to run.

I applied your patch and modified the scenario a bit. Instead of adding 
an ACL for each new port, I instead created one ACL. It looks like:

ovn-nbctl acl-add ls0 to-lport 1000 "outport == @pg1 && ip4.dst == 
\$set1" allow

For each added port, I add the port to group pg1. Re-running the 
scenario, I got pretty much the same results. Honestly, I expected this.

Now here's the exciting part. I then applied Numan Siddique's 
conjunctive match patch on top of yours. I then re-ran the test and got 
these results:

For 100 ports: 6.453s
For 200 ports: 16.008s

Yeah, that's much better! I actually thought I had messed something up 
at first, but after double-checking the generated flows, all was 
correct. With 100 ports, table 44 has 1127 flows. Rather than requiring 
100 ports * 1000 addresses, it creates a conjunctive match of 100 ports 
+ 1000 addresses. For 200 ports, table 44 has 1227 flows. It added 
exactly 100 flows over the 100 port scenario.

 From a performance perspective, this is great! I'll give the actual 
code a review in the upcoming days, hopefully before the weekend.

On 02/28/2018 09:37 PM, Han Zhou wrote:
> This patch enables using port group names in ACL match conditions.
> Users can create a port group in northbound DB Port_Group table,
> and then use the name of the port group in ACL match conditions
> for "inport" or "outport". It can help reduce the number of ACLs
> for CMS clients such as OpenStack Neutron, for the use cases
> where a group of logical ports share same ACL rules except the
> "inport"/"outport" part. Without this patch, the clients have to
> create N (N = number of lports) ACLs, and this patch helps achieve
> the same goal with only one ACL. E.g.:
> 
> to-lport 1000 "outport == @port_group1 && ip4.src == {IP1, IP2, ...}" allow-related
> 
> There was a similar attempt by Zong Kai Li in 2016 [1]. This patch
> takes a slightly different approach by using weak refs instead of
> strings, which requires a new table instead of reusing the address
> set table. This way it will also benefit for a follow up patch that
> enables generating address sets automatically from port groups to
> avoid a lot a trouble from client perspective [2].
> 
> [1] https://mail.openvswitch.org/pipermail/ovs-dev/2016-August/077118.html
> [2] https://mail.openvswitch.org/pipermail/ovs-discuss/2018-February/046260.html
> 
> Reported-by: Daniel Alvarez Sanchez <dalvarez at redhat.com>
> Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2018-February/046166.html
> Signed-off-by: Han Zhou <hzhou8 at ebay.com>
> ---
>   NEWS                            |   2 +
>   include/ovn/expr.h              |  24 +++++---
>   include/ovn/lex.h               |   1 +
>   ovn/controller/lflow.c          |  16 +++--
>   ovn/controller/lflow.h          |   1 +
>   ovn/controller/ofctrl.c         |   6 +-
>   ovn/controller/ofctrl.h         |   3 +-
>   ovn/controller/ovn-controller.c |  31 +++++++---
>   ovn/lib/actions.c               |   3 +-
>   ovn/lib/expr.c                  | 127 ++++++++++++++++++++++++++++------------
>   ovn/lib/lex.c                   |  20 +++++++
>   ovn/northd/ovn-northd.c         |  47 +++++++++++++++
>   ovn/ovn-nb.ovsschema            |  15 ++++-
>   ovn/ovn-nb.xml                  |  30 ++++++++++
>   ovn/ovn-sb.ovsschema            |  10 +++-
>   ovn/ovn-sb.xml                  |  20 +++++++
>   ovn/utilities/ovn-trace.c       |  27 +++++++--
>   tests/ovn.at                    |  34 +++++++++++
>   tests/test-ovn.c                |  43 ++++++++++----
>   19 files changed, 381 insertions(+), 79 deletions(-)
> 
> diff --git a/NEWS b/NEWS
> index 4230189..da2c3ec 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -14,6 +14,8 @@ Post-v2.9.0
>        * OFPT_ROLE_STATUS is now available in OpenFlow 1.3.
>      - Linux kernel 4.14
>        * Add support for compiling OVS with the latest Linux 4.14 kernel
> +   - OVN:
> +     * Port_Group is supported in ACL match conditions.
>   
>   v2.9.0 - 19 Feb 2018
>   --------------------
> diff --git a/include/ovn/expr.h b/include/ovn/expr.h
> index 711713e..3995e62 100644
> --- a/include/ovn/expr.h
> +++ b/include/ovn/expr.h
> @@ -382,9 +382,11 @@ expr_from_node(const struct ovs_list *node)
>   void expr_format(const struct expr *, struct ds *);
>   void expr_print(const struct expr *);
>   struct expr *expr_parse(struct lexer *, const struct shash *symtab,
> -                        const struct shash *addr_sets);
> +                        const struct shash *addr_sets,
> +                        const struct shash *port_groups);
>   struct expr *expr_parse_string(const char *, const struct shash *symtab,
>                                  const struct shash *addr_sets,
> +                               const struct shash *port_groups,
>                                  char **errorp);
>   
>   struct expr *expr_clone(struct expr *);
> @@ -404,6 +406,7 @@ bool expr_is_normalized(const struct expr *);
>   
>   char *expr_parse_microflow(const char *, const struct shash *symtab,
>                              const struct shash *addr_sets,
> +                           const struct shash *port_groups,
>                              bool (*lookup_port)(const void *aux,
>                                                  const char *port_name,
>                                                  unsigned int *portp),
> @@ -486,19 +489,22 @@ void expr_constant_set_format(const struct expr_constant_set *, struct ds *);
>   void expr_constant_set_destroy(struct expr_constant_set *cs);
>   
>   
> -/* Address sets.
> +/* Constant sets.
>    *
> - * Instead of referring to a set of value as:
> + * For example, instead of referring to a set of IP addresses as:
>    *    {addr1, addr2, ..., addrN}
>    * You can register a set of values and refer to them as:
>    *    $name
> - * The address set entries should all have integer/masked-integer values.
> - * The values that don't qualify are ignored.
> + *
> + * If convert_to_integer is true, the set must contain
> + * integer/masked-integer values. The values that don't qualify
> + * are ignored.
>    */
>   
> -void expr_addr_sets_add(struct shash *addr_sets, const char *name,
> -                        const char * const *values, size_t n_values);
> -void expr_addr_sets_remove(struct shash *addr_sets, const char *name);
> -void expr_addr_sets_destroy(struct shash *addr_sets);
> +void expr_const_sets_add(struct shash *const_sets, const char *name,
> +                         const char * const *values, size_t n_values,
> +                         bool convert_to_integer);
> +void expr_const_sets_remove(struct shash *const_sets, const char *name);
> +void expr_const_sets_destroy(struct shash *const_sets);
>   
>   #endif /* ovn/expr.h */
> diff --git a/include/ovn/lex.h b/include/ovn/lex.h
> index afa4a23..8d55857 100644
> --- a/include/ovn/lex.h
> +++ b/include/ovn/lex.h
> @@ -37,6 +37,7 @@ enum lex_type {
>       LEX_T_INTEGER,              /* 12345 or 1.2.3.4 or ::1 or 01:02:03:04:05 */
>       LEX_T_MASKED_INTEGER,       /* 12345/10 or 1.2.0.0/16 or ::2/127 or... */
>       LEX_T_MACRO,                /* $NAME */
> +    LEX_T_PORT_GROUP,            /* @NAME */
>       LEX_T_ERROR,                /* invalid input */
>   
>       /* Bare tokens. */
> diff --git a/ovn/controller/lflow.c b/ovn/controller/lflow.c
> index df125b1..cc2a020 100644
> --- a/ovn/controller/lflow.c
> +++ b/ovn/controller/lflow.c
> @@ -70,6 +70,7 @@ static void consider_logical_flow(struct controller_ctx *ctx,
>                                     struct hmap *nd_ra_opts,
>                                     uint32_t *conj_id_ofs,
>                                     const struct shash *addr_sets,
> +                                  const struct shash *port_groups,
>                                     struct hmap *flow_table,
>                                     struct sset *active_tunnels,
>                                     struct sset *local_lport_ids);
> @@ -149,6 +150,7 @@ add_logical_flows(struct controller_ctx *ctx,
>                     struct ovn_extend_table *meter_table,
>                     const struct sbrec_chassis *chassis,
>                     const struct shash *addr_sets,
> +                  const struct shash *port_groups,
>                     struct hmap *flow_table,
>                     struct sset *active_tunnels,
>                     struct sset *local_lport_ids)
> @@ -179,8 +181,8 @@ add_logical_flows(struct controller_ctx *ctx,
>                                 lflow, local_datapaths,
>                                 group_table, meter_table, chassis,
>                                 &dhcp_opts, &dhcpv6_opts, &nd_ra_opts,
> -                              &conj_id_ofs, addr_sets, flow_table,
> -                              active_tunnels, local_lport_ids);
> +                              &conj_id_ofs, addr_sets, port_groups,
> +                              flow_table, active_tunnels, local_lport_ids);
>       }
>   
>       dhcp_opts_destroy(&dhcp_opts);
> @@ -201,6 +203,7 @@ consider_logical_flow(struct controller_ctx *ctx,
>                         struct hmap *nd_ra_opts,
>                         uint32_t *conj_id_ofs,
>                         const struct shash *addr_sets,
> +                      const struct shash *port_groups,
>                         struct hmap *flow_table,
>                         struct sset *active_tunnels,
>                         struct sset *local_lport_ids)
> @@ -258,7 +261,8 @@ consider_logical_flow(struct controller_ctx *ctx,
>       struct hmap matches;
>       struct expr *expr;
>   
> -    expr = expr_parse_string(lflow->match, &symtab, addr_sets, &error);
> +    expr = expr_parse_string(lflow->match, &symtab, addr_sets, port_groups,
> +                             &error);
>       if (!error) {
>           if (prereqs) {
>               expr = expr_combine(EXPR_T_AND, expr, prereqs);
> @@ -450,13 +454,15 @@ lflow_run(struct controller_ctx *ctx,
>             struct ovn_extend_table *group_table,
>             struct ovn_extend_table *meter_table,
>             const struct shash *addr_sets,
> +          const struct shash *port_groups,
>             struct hmap *flow_table,
>             struct sset *active_tunnels,
>             struct sset *local_lport_ids)
>   {
>       add_logical_flows(ctx, chassis_index, local_datapaths,
> -                      group_table, meter_table, chassis, addr_sets, flow_table,
> -                      active_tunnels, local_lport_ids);
> +                      group_table, meter_table, chassis, addr_sets,
> +                      port_groups, flow_table, active_tunnels,
> +                      local_lport_ids);
>       add_neighbor_flows(ctx, flow_table);
>   }
>   
> diff --git a/ovn/controller/lflow.h b/ovn/controller/lflow.h
> index 22bf534..dcf2fe7 100644
> --- a/ovn/controller/lflow.h
> +++ b/ovn/controller/lflow.h
> @@ -69,6 +69,7 @@ void lflow_run(struct controller_ctx *,
>                  struct ovn_extend_table *group_table,
>                  struct ovn_extend_table *meter_table,
>                  const struct shash *addr_sets,
> +               const struct shash *port_groups,
>                  struct hmap *flow_table,
>                  struct sset *active_tunnels,
>                  struct sset *local_lport_ids);
> diff --git a/ovn/controller/ofctrl.c b/ovn/controller/ofctrl.c
> index 8d6d1b6..e3ee6b1 100644
> --- a/ovn/controller/ofctrl.c
> +++ b/ovn/controller/ofctrl.c
> @@ -1145,7 +1145,8 @@ ofctrl_lookup_port(const void *br_int_, const char *port_name,
>    * must free(). */
>   char *
>   ofctrl_inject_pkt(const struct ovsrec_bridge *br_int, const char *flow_s,
> -                  const struct shash *addr_sets)
> +                  const struct shash *addr_sets,
> +                  const struct shash *port_groups)
>   {
>       int version = rconn_get_version(swconn);
>       if (version < 0) {
> @@ -1154,7 +1155,8 @@ ofctrl_inject_pkt(const struct ovsrec_bridge *br_int, const char *flow_s,
>   
>       struct flow uflow;
>       char *error = expr_parse_microflow(flow_s, &symtab, addr_sets,
> -                                       ofctrl_lookup_port, br_int, &uflow);
> +                                       port_groups, ofctrl_lookup_port,
> +                                       br_int, &uflow);
>       if (error) {
>           return error;
>       }
> diff --git a/ovn/controller/ofctrl.h b/ovn/controller/ofctrl.h
> index d53bc68..a8b3afc 100644
> --- a/ovn/controller/ofctrl.h
> +++ b/ovn/controller/ofctrl.h
> @@ -47,7 +47,8 @@ struct ovn_flow *ofctrl_dup_flow(struct ovn_flow *source);
>   void ofctrl_ct_flush_zone(uint16_t zone_id);
>   
>   char *ofctrl_inject_pkt(const struct ovsrec_bridge *br_int,
> -                        const char *flow_s, const struct shash *addr_sets);
> +                        const char *flow_s, const struct shash *addr_sets,
> +                        const struct shash *port_groups);
>   
>   /* Flow table interfaces to the rest of ovn-controller. */
>   void ofctrl_add_flow(struct hmap *desired_flows, uint8_t table_id,
> diff --git a/ovn/controller/ovn-controller.c b/ovn/controller/ovn-controller.c
> index 7592bda..492e4fa 100644
> --- a/ovn/controller/ovn-controller.c
> +++ b/ovn/controller/ovn-controller.c
> @@ -288,9 +288,22 @@ addr_sets_init(struct controller_ctx *ctx, struct shash *addr_sets)
>   {
>       const struct sbrec_address_set *as;
>       SBREC_ADDRESS_SET_FOR_EACH (as, ctx->ovnsb_idl) {
> -        expr_addr_sets_add(addr_sets, as->name,
> -                           (const char *const *) as->addresses,
> -                           as->n_addresses);
> +        expr_const_sets_add(addr_sets, as->name,
> +                            (const char *const *) as->addresses,
> +                            as->n_addresses, true);
> +    }
> +}
> +
> +/* Iterate port groups in the southbound database.  Create and update the
> + * corresponding symtab entries as necessary. */
> +static void
> +port_groups_init(struct controller_ctx *ctx, struct shash *port_groups)
> +{
> +    const struct sbrec_port_group *pg;
> +    SBREC_PORT_GROUP_FOR_EACH (pg, ctx->ovnsb_idl) {
> +        expr_const_sets_add(port_groups, pg->name,
> +                            (const char *const *) pg->ports,
> +                            pg->n_ports, false);
>       }
>   }
>   
> @@ -696,6 +709,8 @@ main(int argc, char *argv[])
>           if (br_int && chassis) {
>               struct shash addr_sets = SHASH_INITIALIZER(&addr_sets);
>               addr_sets_init(&ctx, &addr_sets);
> +            struct shash port_groups = SHASH_INITIALIZER(&port_groups);
> +            port_groups_init(&ctx, &port_groups);
>   
>               patch_run(&ctx, br_int, chassis);
>   
> @@ -713,8 +728,8 @@ main(int argc, char *argv[])
>                       struct hmap flow_table = HMAP_INITIALIZER(&flow_table);
>                       lflow_run(&ctx, chassis,
>                                 &chassis_index, &local_datapaths, &group_table,
> -                              &meter_table, &addr_sets, &flow_table,
> -                              &active_tunnels, &local_lport_ids);
> +                              &meter_table, &addr_sets, &port_groups,
> +                              &flow_table, &active_tunnels, &local_lport_ids);
>   
>                       if (chassis_id) {
>                           bfd_run(&ctx, br_int, chassis, &local_datapaths,
> @@ -740,7 +755,7 @@ main(int argc, char *argv[])
>   
>               if (pending_pkt.conn) {
>                   char *error = ofctrl_inject_pkt(br_int, pending_pkt.flow_s,
> -                                                &addr_sets);
> +                                                &port_groups, &addr_sets);
>                   if (error) {
>                       unixctl_command_reply_error(pending_pkt.conn, error);
>                       free(error);
> @@ -754,8 +769,10 @@ main(int argc, char *argv[])
>               update_sb_monitors(ctx.ovnsb_idl, chassis,
>                                  &local_lports, &local_datapaths);
>   
> -            expr_addr_sets_destroy(&addr_sets);
> +            expr_const_sets_destroy(&addr_sets);
>               shash_destroy(&addr_sets);
> +            expr_const_sets_destroy(&port_groups);
> +            shash_destroy(&port_groups);
>           }
>   
>           /* If we haven't handled the pending packet insertion
> diff --git a/ovn/lib/actions.c b/ovn/lib/actions.c
> index fde3bff..8845e77 100644
> --- a/ovn/lib/actions.c
> +++ b/ovn/lib/actions.c
> @@ -234,7 +234,8 @@ add_prerequisite(struct action_context *ctx, const char *prerequisite)
>       struct expr *expr;
>       char *error;
>   
> -    expr = expr_parse_string(prerequisite, ctx->pp->symtab, NULL, &error);
> +    expr = expr_parse_string(prerequisite, ctx->pp->symtab, NULL, NULL,
> +                             &error);
>       ovs_assert(!error);
>       ctx->prereqs = expr_combine(EXPR_T_AND, ctx->prereqs, expr);
>   }
> diff --git a/ovn/lib/expr.c b/ovn/lib/expr.c
> index b0aa672..1a33269 100644
> --- a/ovn/lib/expr.c
> +++ b/ovn/lib/expr.c
> @@ -464,6 +464,7 @@ struct expr_context {
>       struct lexer *lexer;           /* Lexer for pulling more tokens. */
>       const struct shash *symtab;    /* Symbol table. */
>       const struct shash *addr_sets; /* Address set table. */
> +    const struct shash *port_groups; /* Port groups table. */
>       bool not;                    /* True inside odd number of NOT operators. */
>   };
>   
> @@ -752,6 +753,36 @@ parse_addr_sets(struct expr_context *ctx, struct expr_constant_set *cs,
>   }
>   
>   static bool
> +parse_port_group(struct expr_context *ctx, struct expr_constant_set *cs,
> +                 size_t *allocated_values)
> +{
> +    struct expr_constant_set *port_group
> +        = (ctx->port_groups
> +           ? shash_find_data(ctx->port_groups, ctx->lexer->token.s)
> +           : NULL);
> +    if (!port_group) {
> +        lexer_syntax_error(ctx->lexer, "expecting port group name");
> +        return false;
> +    }
> +
> +    if (!assign_constant_set_type(ctx, cs, EXPR_C_STRING)) {
> +        return false;
> +    }
> +
> +    size_t n_values = cs->n_values + port_group->n_values;
> +    if (n_values >= *allocated_values) {
> +        cs->values = xrealloc(cs->values, n_values * sizeof *cs->values);
> +        *allocated_values = n_values;
> +    }
> +    for (size_t i = 0; i < port_group->n_values; i++) {
> +        cs->values[cs->n_values++].string =
> +            xstrdup(port_group->values[i].string);
> +    }
> +
> +    return true;
> +}
> +
> +static bool
>   parse_constant(struct expr_context *ctx, struct expr_constant_set *cs,
>                  size_t *allocated_values)
>   {
> @@ -788,6 +819,12 @@ parse_constant(struct expr_context *ctx, struct expr_constant_set *cs,
>           }
>           lexer_get(ctx->lexer);
>           return true;
> +    } else if (ctx->lexer->token.type == LEX_T_PORT_GROUP) {
> +        if (!parse_port_group(ctx, cs, allocated_values)) {
> +            return false;
> +        }
> +        lexer_get(ctx->lexer);
> +        return true;
>       } else {
>           lexer_syntax_error(ctx->lexer, "expecting constant");
>           return false;
> @@ -939,65 +976,74 @@ expr_constant_set_destroy(struct expr_constant_set *cs)
>       }
>   }
>   
> -/* Adds an address set named 'name' to 'addr_sets', replacing any existing
> - * address set entry with the given name. */
> +/* Adds an constant set named 'name' to 'const_sets', replacing any existing
> + * constant set entry with the given name. */
>   void
> -expr_addr_sets_add(struct shash *addr_sets, const char *name,
> -                   const char *const *values, size_t n_values)
> +expr_const_sets_add(struct shash *const_sets, const char *name,
> +                    const char *const *values, size_t n_values,
> +                    bool convert_to_integer)
>   {
>       /* Replace any existing entry for this name. */
> -    expr_addr_sets_remove(addr_sets, name);
> +    expr_const_sets_remove(const_sets, name);
>   
>       struct expr_constant_set *cs = xzalloc(sizeof *cs);
> -    cs->type = EXPR_C_INTEGER;
>       cs->in_curlies = true;
>       cs->n_values = 0;
>       cs->values = xmalloc(n_values * sizeof *cs->values);
> -    for (size_t i = 0; i < n_values; i++) {
> -        /* Use the lexer to convert each address set into the proper
> -         * integer format. */
> -        struct lexer lex;
> -        lexer_init(&lex, values[i]);
> -        lexer_get(&lex);
> -        if (lex.token.type != LEX_T_INTEGER
> -            && lex.token.type != LEX_T_MASKED_INTEGER) {
> -            VLOG_WARN("Invalid address set entry: '%s', token type: %d",
> -                      values[i], lex.token.type);
> -        } else {
> -            union expr_constant *c = &cs->values[cs->n_values++];
> -            c->value = lex.token.value;
> -            c->format = lex.token.format;
> -            c->masked = lex.token.type == LEX_T_MASKED_INTEGER;
> -            if (c->masked) {
> -                c->mask = lex.token.mask;
> +    if (convert_to_integer) {
> +        cs->type = EXPR_C_INTEGER;
> +        for (size_t i = 0; i < n_values; i++) {
> +            /* Use the lexer to convert each constant set into the proper
> +             * integer format. */
> +            struct lexer lex;
> +            lexer_init(&lex, values[i]);
> +            lexer_get(&lex);
> +            if (lex.token.type != LEX_T_INTEGER
> +                && lex.token.type != LEX_T_MASKED_INTEGER) {
> +                VLOG_WARN("Invalid constant set entry: '%s', token type: %d",
> +                          values[i], lex.token.type);
> +            } else {
> +                union expr_constant *c = &cs->values[cs->n_values++];
> +                c->value = lex.token.value;
> +                c->format = lex.token.format;
> +                c->masked = lex.token.type == LEX_T_MASKED_INTEGER;
> +                if (c->masked) {
> +                    c->mask = lex.token.mask;
> +                }
>               }
> +            lexer_destroy(&lex);
> +        }
> +    } else {
> +        cs->type = EXPR_C_STRING;
> +        for (size_t i = 0; i < n_values; i++) {
> +            union expr_constant *c = &cs->values[cs->n_values++];
> +            c->string = xstrdup(values[i]);
>           }
> -        lexer_destroy(&lex);
>       }
>   
> -    shash_add(addr_sets, name, cs);
> +    shash_add(const_sets, name, cs);
>   }
>   
>   void
> -expr_addr_sets_remove(struct shash *addr_sets, const char *name)
> +expr_const_sets_remove(struct shash *const_sets, const char *name)
>   {
> -    struct expr_constant_set *cs = shash_find_and_delete(addr_sets, name);
> +    struct expr_constant_set *cs = shash_find_and_delete(const_sets, name);
>       if (cs) {
>           expr_constant_set_destroy(cs);
>           free(cs);
>       }
>   }
>   
> -/* Destroy all contents of 'addr_sets'. */
> +/* Destroy all contents of 'const_sets'. */
>   void
> -expr_addr_sets_destroy(struct shash *addr_sets)
> +expr_const_sets_destroy(struct shash *const_sets)
>   {
>       struct shash_node *node, *next;
>   
> -    SHASH_FOR_EACH_SAFE (node, next, addr_sets) {
> +    SHASH_FOR_EACH_SAFE (node, next, const_sets) {
>           struct expr_constant_set *cs = node->data;
>   
> -        shash_delete(addr_sets, node);
> +        shash_delete(const_sets, node);
>           expr_constant_set_destroy(cs);
>           free(cs);
>       }
> @@ -1214,11 +1260,13 @@ expr_parse__(struct expr_context *ctx)
>    * lexer->error is NULL. */
>   struct expr *
>   expr_parse(struct lexer *lexer, const struct shash *symtab,
> -           const struct shash *addr_sets)
> +           const struct shash *addr_sets,
> +           const struct shash *port_groups)
>   {
>       struct expr_context ctx = { .lexer = lexer,
>                                   .symtab = symtab,
> -                                .addr_sets = addr_sets };
> +                                .addr_sets = addr_sets,
> +                                .port_groups = port_groups };
>       return lexer->error ? NULL : expr_parse__(&ctx);
>   }
>   
> @@ -1230,13 +1278,15 @@ expr_parse(struct lexer *lexer, const struct shash *symtab,
>    * error (with free()). */
>   struct expr *
>   expr_parse_string(const char *s, const struct shash *symtab,
> -                  const struct shash *addr_sets, char **errorp)
> +                  const struct shash *addr_sets,
> +                  const struct shash *port_groups,
> +                  char **errorp)
>   {
>       struct lexer lexer;
>   
>       lexer_init(&lexer, s);
>       lexer_get(&lexer);
> -    struct expr *expr = expr_parse(&lexer, symtab, addr_sets);
> +    struct expr *expr = expr_parse(&lexer, symtab, addr_sets, port_groups);
>       lexer_force_end(&lexer);
>       *errorp = lexer_steal_error(&lexer);
>       if (*errorp) {
> @@ -1460,7 +1510,7 @@ expr_get_level(const struct expr *expr)
>   static enum expr_level
>   expr_parse_level(const char *s, const struct shash *symtab, char **errorp)
>   {
> -    struct expr *expr = expr_parse_string(s, symtab, NULL, errorp);
> +    struct expr *expr = expr_parse_string(s, symtab, NULL, NULL, errorp);
>       enum expr_level level = expr ? expr_get_level(expr) : EXPR_L_NOMINAL;
>       expr_destroy(expr);
>       return level;
> @@ -1618,7 +1668,7 @@ parse_and_annotate(const char *s, const struct shash *symtab,
>       char *error;
>       struct expr *expr;
>   
> -    expr = expr_parse_string(s, symtab, NULL, &error);
> +    expr = expr_parse_string(s, symtab, NULL, NULL, &error);
>       if (expr) {
>           expr = expr_annotate__(expr, symtab, nesting, &error);
>       }
> @@ -3277,6 +3327,7 @@ expr_parse_microflow__(struct lexer *lexer,
>   char * OVS_WARN_UNUSED_RESULT
>   expr_parse_microflow(const char *s, const struct shash *symtab,
>                        const struct shash *addr_sets,
> +                     const struct shash *port_groups,
>                        bool (*lookup_port)(const void *aux,
>                                            const char *port_name,
>                                            unsigned int *portp),
> @@ -3286,7 +3337,7 @@ expr_parse_microflow(const char *s, const struct shash *symtab,
>       lexer_init(&lexer, s);
>       lexer_get(&lexer);
>   
> -    struct expr *e = expr_parse(&lexer, symtab, addr_sets);
> +    struct expr *e = expr_parse(&lexer, symtab, addr_sets, port_groups);
>       lexer_force_end(&lexer);
>   
>       if (e) {
> diff --git a/ovn/lib/lex.c b/ovn/lib/lex.c
> index 2f49af0..9463640 100644
> --- a/ovn/lib/lex.c
> +++ b/ovn/lib/lex.c
> @@ -231,6 +231,10 @@ lex_token_format(const struct lex_token *token, struct ds *s)
>           ds_put_format(s, "$%s", token->s);
>           break;
>   
> +    case LEX_T_PORT_GROUP:
> +        ds_put_format(s, "@%s", token->s);
> +        break;
> +
>       case LEX_T_LPAREN:
>           ds_put_cstr(s, "(");
>           break;
> @@ -573,6 +577,18 @@ lex_parse_addr_set(const char *p, struct lex_token *token)
>       return lex_parse_id(p, LEX_T_MACRO, token);
>   }
>   
> +static const char *
> +lex_parse_port_group(const char *p, struct lex_token *token)
> +{
> +    p++;
> +    if (!lex_is_id1(*p)) {
> +        lex_error(token, "`$' must be followed by a valid identifier.");
> +        return p;
> +    }
> +
> +    return lex_parse_id(p, LEX_T_PORT_GROUP, token);
> +}
> +
>   /* Initializes 'token' and parses the first token from the beginning of
>    * null-terminated string 'p' into 'token'.  Stores a pointer to the start of
>    * the token (after skipping white space and comments, if any) into '*startp'.
> @@ -747,6 +763,10 @@ next:
>           p = lex_parse_addr_set(p, token);
>           break;
>   
> +    case '@':
> +        p = lex_parse_port_group(p, token);
> +        break;
> +
>       case ':':
>           if (p[1] != ':') {
>               token->type = LEX_T_COLON;
> diff --git a/ovn/northd/ovn-northd.c b/ovn/northd/ovn-northd.c
> index d83681c..2924d8f 100644
> --- a/ovn/northd/ovn-northd.c
> +++ b/ovn/northd/ovn-northd.c
> @@ -6135,6 +6135,49 @@ sync_address_sets(struct northd_context *ctx)
>       shash_destroy(&sb_address_sets);
>   }
>   
> +/* Each port group in Port_Group table in OVN_Northbound has a corresponding
> + * entry in Port_Group table in OVN_Southbound. In OVN_Northbound the entries
> + * contains lport uuids, while in OVN_Southbound we store the lport names.
> + */
> +static void
> +sync_port_groups(struct northd_context *ctx)
> +{
> +    struct shash sb_port_groups = SHASH_INITIALIZER(&sb_port_groups);
> +
> +    const struct sbrec_port_group *sb_port_group;
> +    SBREC_PORT_GROUP_FOR_EACH (sb_port_group, ctx->ovnsb_idl) {
> +        shash_add(&sb_port_groups, sb_port_group->name, sb_port_group);
> +    }
> +
> +    const struct nbrec_port_group *nb_port_group;
> +    NBREC_PORT_GROUP_FOR_EACH (nb_port_group, ctx->ovnnb_idl) {
> +        sb_port_group = shash_find_and_delete(&sb_port_groups,
> +                                               nb_port_group->name);
> +        if (!sb_port_group) {
> +            sb_port_group = sbrec_port_group_insert(ctx->ovnsb_txn);
> +            sbrec_port_group_set_name(sb_port_group, nb_port_group->name);
> +        }
> +
> +        const char **nb_port_names = xcalloc(nb_port_group->n_ports,
> +                                             sizeof *nb_port_names);
> +        int i;
> +        for (i = 0; i < nb_port_group->n_ports; i++) {
> +            nb_port_names[i] = nb_port_group->ports[i]->name;
> +        }
> +        sbrec_port_group_set_ports(sb_port_group,
> +                                   nb_port_names,
> +                                   nb_port_group->n_ports);
> +        free(nb_port_names);
> +    }
> +
> +    struct shash_node *node, *next;
> +    SHASH_FOR_EACH_SAFE (node, next, &sb_port_groups) {
> +        sbrec_port_group_delete(node->data);
> +        shash_delete(&sb_port_groups, node);
> +    }
> +    shash_destroy(&sb_port_groups);
> +}
> +
>   /*
>    * struct 'dns_info' is used to sync the DNS records between OVN Northbound db
>    * and Southbound db.
> @@ -6251,6 +6294,7 @@ ovnnb_db_run(struct northd_context *ctx, struct chassis_index *chassis_index,
>       build_lflows(ctx, &datapaths, &ports);
>   
>       sync_address_sets(ctx);
> +    sync_port_groups(ctx);
>       sync_dns_entries(ctx, &datapaths);
>   
>       struct ovn_datapath *dp, *next_dp;
> @@ -6848,6 +6892,9 @@ main(int argc, char *argv[])
>       ovsdb_idl_add_table(ovnsb_idl_loop.idl, &sbrec_table_address_set);
>       add_column_noalert(ovnsb_idl_loop.idl, &sbrec_address_set_col_name);
>       add_column_noalert(ovnsb_idl_loop.idl, &sbrec_address_set_col_addresses);
> +    ovsdb_idl_add_table(ovnsb_idl_loop.idl, &sbrec_table_port_group);
> +    add_column_noalert(ovnsb_idl_loop.idl, &sbrec_port_group_col_name);
> +    add_column_noalert(ovnsb_idl_loop.idl, &sbrec_port_group_col_ports);
>   
>       ovsdb_idl_add_table(ovnsb_idl_loop.idl, &sbrec_table_dns);
>       add_column_noalert(ovnsb_idl_loop.idl, &sbrec_dns_col_datapaths);
> diff --git a/ovn/ovn-nb.ovsschema b/ovn/ovn-nb.ovsschema
> index 32f9d5a..2d09282 100644
> --- a/ovn/ovn-nb.ovsschema
> +++ b/ovn/ovn-nb.ovsschema
> @@ -1,7 +1,7 @@
>   {
>       "name": "OVN_Northbound",
>       "version": "5.10.0",
> -    "cksum": "626737541 17810",
> +    "cksum": "222987318 18430",
>       "tables": {
>           "NB_Global": {
>               "columns": {
> @@ -114,6 +114,19 @@
>                                "min": 0, "max": "unlimited"}}},
>               "indexes": [["name"]],
>               "isRoot": true},
> +        "Port_Group": {
> +            "columns": {
> +                "name": {"type": "string"},
> +                "ports": {"type": {"key": {"type": "uuid",
> +                                           "refTable": "Logical_Switch_Port",
> +                                           "refType": "weak"},
> +                                   "min": 0,
> +                                   "max": "unlimited"}},
> +                "external_ids": {
> +                    "type": {"key": "string", "value": "string",
> +                             "min": 0, "max": "unlimited"}}},
> +            "indexes": [["name"]],
> +            "isRoot": true},
>           "Load_Balancer": {
>               "columns": {
>                   "name": {"type": "string"},
> diff --git a/ovn/ovn-nb.xml b/ovn/ovn-nb.xml
> index b7a5b6b..83727c5 100644
> --- a/ovn/ovn-nb.xml
> +++ b/ovn/ovn-nb.xml
> @@ -922,6 +922,36 @@
>       </group>
>     </table>
>   
> +  <table name="Port_Group" title="Port Groups">
> +    <p>
> +      Each row in this table represents a named group of logical switch ports.
> +    </p>
> +
> +    <p>
> +      Port groups may be used in the <ref column="match" table="ACL"/> column
> +      of the <ref table="ACL"/> table.  For syntax information, see the details
> +      of the expression language used for the <ref column="match"
> +      table="Logical_Flow" db="OVN_Southbound"/> column in the <ref
> +      table="Logical_Flow" db="OVN_Southbound"/> table of the <ref
> +      db="OVN_Southbound"/> database.
> +    </p>
> +
> +    <column name="name">
> +      A name for the port group.  Names are ASCII and must match
> +      <code>[a-zA-Z_.][a-zA-Z_.0-9]*</code>.
> +    </column>
> +
> +    <column name="ports">
> +      The logical switch ports belonging to the group in uuids.
> +    </column>
> +
> +    <group title="Common Columns">
> +      <column name="external_ids">
> +        See <em>External IDs</em> at the beginning of this document.
> +      </column>
> +    </group>
> +  </table>
> +
>     <table name="Load_Balancer" title="load balancer">
>       <p>
>         Each row represents one load balancer.
> diff --git a/ovn/ovn-sb.ovsschema b/ovn/ovn-sb.ovsschema
> index 2abcc6b..9e271d4 100644
> --- a/ovn/ovn-sb.ovsschema
> +++ b/ovn/ovn-sb.ovsschema
> @@ -1,7 +1,7 @@
>   {
>       "name": "OVN_Southbound",
>       "version": "1.15.0",
> -    "cksum": "70426956 13327",
> +    "cksum": "1839738004 13639",
>       "tables": {
>           "SB_Global": {
>               "columns": {
> @@ -55,6 +55,14 @@
>                                          "max": "unlimited"}}},
>               "indexes": [["name"]],
>               "isRoot": true},
> +        "Port_Group": {
> +            "columns": {
> +                "name": {"type": "string"},
> +                "ports": {"type": {"key": "string",
> +                                   "min": 0,
> +                                   "max": "unlimited"}}},
> +            "indexes": [["name"]],
> +            "isRoot": true},
>           "Logical_Flow": {
>               "columns": {
>                   "logical_datapath": {"type": {"key": {"type": "uuid",
> diff --git a/ovn/ovn-sb.xml b/ovn/ovn-sb.xml
> index f000b16..2eac943 100644
> --- a/ovn/ovn-sb.xml
> +++ b/ovn/ovn-sb.xml
> @@ -377,6 +377,18 @@
>       <column name="addresses"/>
>     </table>
>   
> +  <table name="Port_Group" title="Port Groups">
> +    <p>
> +      This table contains names for the logical switch ports in the
> +      <ref db="OVN_Northbound"/> database that belongs to the same group
> +      that is defined in <ref table="Port_Group" db="OVN_Northbound"/>
> +      in the <ref db="OVN_Northbound"/> database.
> +    </p>
> +
> +    <column name="name"/>
> +    <column name="ports"/>
> +  </table>
> +
>     <table name="Logical_Flow" title="Logical Network Flows">
>       <p>
>         Each row in this table represents one logical flow.
> @@ -770,6 +782,14 @@
>           <code>$set1</code>.
>         </p>
>   
> +      <p>
> +        You may refer to a group of logical switch ports stored in the
> +        <ref table="Port_Group"/> table by its <ref column="name"
> +        table="Port_Group"/>.  An <ref table="Port_Group"/> with a name
> +        of <code>port_group1</code> can be referred to as
> +        <code>@port_group1</code>.
> +      </p>
> +
>         <p><em>Miscellaneous</em></p>
>   
>         <p>
> diff --git a/ovn/utilities/ovn-trace.c b/ovn/utilities/ovn-trace.c
> index db39c49..5a9e73d 100644
> --- a/ovn/utilities/ovn-trace.c
> +++ b/ovn/utilities/ovn-trace.c
> @@ -418,6 +418,9 @@ static struct shash symtab;
>   /* Address sets. */
>   static struct shash address_sets;
>   
> +/* Port groups. */
> +static struct shash port_groups;
> +
>   /* DHCP options. */
>   static struct hmap dhcp_opts;   /* Contains "struct gen_opts_map"s. */
>   static struct hmap dhcpv6_opts; /* Contains "struct gen_opts_map"s. */
> @@ -697,9 +700,22 @@ read_address_sets(void)
>   
>       const struct sbrec_address_set *sbas;
>       SBREC_ADDRESS_SET_FOR_EACH (sbas, ovnsb_idl) {
> -        expr_addr_sets_add(&address_sets, sbas->name,
> +        expr_const_sets_add(&address_sets, sbas->name,
>                              (const char *const *) sbas->addresses,
> -                           sbas->n_addresses);
> +                           sbas->n_addresses, true);
> +    }
> +}
> +
> +static void
> +read_port_groups(void)
> +{
> +    shash_init(&port_groups);
> +
> +    const struct sbrec_port_group *sbpg;
> +    SBREC_PORT_GROUP_FOR_EACH (sbpg, ovnsb_idl) {
> +        expr_const_sets_add(&port_groups, sbpg->name,
> +                           (const char *const *) sbpg->ports,
> +                           sbpg->n_ports, false);
>       }
>   }
>   
> @@ -796,7 +812,8 @@ read_flows(void)
>   
>           char *error;
>           struct expr *match;
> -        match = expr_parse_string(sblf->match, &symtab, &address_sets, &error);
> +        match = expr_parse_string(sblf->match, &symtab, &address_sets,
> +                                  &port_groups, &error);
>           if (error) {
>               VLOG_WARN("%s: parsing expression failed (%s)",
>                         sblf->match, error);
> @@ -937,6 +954,7 @@ read_db(void)
>       read_ports();
>       read_mcgroups();
>       read_address_sets();
> +    read_port_groups();
>       read_gen_opts();
>       read_flows();
>       read_mac_bindings();
> @@ -2009,7 +2027,8 @@ trace(const char *dp_s, const char *flow_s)
>   
>       struct flow uflow;
>       char *error = expr_parse_microflow(flow_s, &symtab, &address_sets,
> -                                       ovntrace_lookup_port, dp, &uflow);
> +                                       &port_groups, ovntrace_lookup_port,
> +                                       dp, &uflow);
>       if (error) {
>           char *s = xasprintf("error parsing flow: %s\n", error);
>           free(error);
> diff --git a/tests/ovn.at b/tests/ovn.at
> index 8ee3bf0..c8ab7b7 100644
> --- a/tests/ovn.at
> +++ b/tests/ovn.at
> @@ -304,6 +304,7 @@ inport = "eth0" => Syntax error at `=' expecting relational operator.
>   123 == 123 => Syntax error at `123' expecting field name.
>   
>   $name => Syntax error at `$name' expecting address set name.
> + at name => Syntax error at `@name' expecting port group name.
>   
>   123 == xyzzy => Syntax error at `xyzzy' expecting field name.
>   xyzzy == 1 => Syntax error at `xyzzy' expecting field name.
> @@ -657,6 +658,24 @@ ip,nw_src=8.0.0.0/8.0.0.0
>   ])
>   AT_CLEANUP
>   
> +AT_SETUP([ovn -- converting expressions to flows -- port groups])
> +AT_KEYWORDS([expression])
> +expr_to_flow () {
> +    echo "$1" | ovstest test-ovn expr-to-flows | sort
> +}
> +AT_CHECK([expr_to_flow 'outport == @pg1'], [0], [dnl
> +reg15=0x11
> +reg15=0x12
> +reg15=0x13
> +])
> +AT_CHECK([expr_to_flow 'outport == {@pg_empty}'], [0], [dnl
> +(no flows)
> +])
> +AT_CHECK([expr_to_flow 'outport == {"lsp1", @pg_empty}'], [0], [dnl
> +reg15=0x11
> +])
> +AT_CLEANUP
> +
>   AT_SETUP([ovn -- action parsing])
>   dnl Unindented text is input (a set of OVN logical actions).
>   dnl Indented text is expected output.
> @@ -1194,6 +1213,13 @@ ovn-nbctl acl-add lsw0 to-lport 1000 'eth.type == 0x1236 && outport == "lp33"' d
>   ovn-nbctl create Address_Set name=set1 addresses=\"f0:00:00:00:00:11\",\"f0:00:00:00:00:21\",\"f0:00:00:00:00:31\"
>   ovn-nbctl acl-add lsw0 to-lport 1000 'eth.type == 0x1237 && eth.src == $set1 && outport == "lp33"' drop
>   
> +get_lsp_uuid () {
> +    ovn-nbctl lsp-list lsw0 | grep $1 | awk '{ print $1 }'
> +}
> +
> +ovn-nbctl create Port_Group name=pg1 ports=`get_lsp_uuid lp22`,`get_lsp_uuid lp33`
> +ovn-nbctl acl-add lsw0 to-lport 1000 'eth.type == 0x1238 && outport == @pg1' drop
> +
>   # Pre-populate the hypervisors' ARP tables so that we don't lose any
>   # packets for ARP resolution (native tunneling doesn't queue packets
>   # for ARP resolution).
> @@ -1334,10 +1360,18 @@ for is in 1 2 3; do
>                   else
>                       acl4=$d
>                   fi
> +                if test $d = $s || test $d = 22 || test $d = 33; then
> +                    # dest of 22 and 33 should be dropped
> +                    # due to the 5th ACL that uses port_group(pg1).
> +                    acl5=
> +                else
> +                    acl5=$d
> +                fi
>                   test_packet $s f000000000$d f000000000$s 1234        #7, acl1
>                   test_packet $s f000000000$d f000000000$s 1235 $acl2  #7, acl2
>                   test_packet $s f000000000$d f000000000$s 1236 $acl3  #7, acl3
>                   test_packet $s f000000000$d f000000000$s 1237 $acl4  #7, acl4
> +                test_packet $s f000000000$d f000000000$s 1238 $acl5  #7, acl5
>   
>                   test_packet $s f000000000$d f00000000055 810000091234      #4
>                   test_packet $s f000000000$d 0100000000$s $s$d              #5
> diff --git a/tests/test-ovn.c b/tests/test-ovn.c
> index 7452753..d4a5d59 100644
> --- a/tests/test-ovn.c
> +++ b/tests/test-ovn.c
> @@ -211,10 +211,24 @@ create_addr_sets(struct shash *addr_sets)
>       };
>       static const char *const addrs4[] = { NULL };
>   
> -    expr_addr_sets_add(addr_sets, "set1", addrs1, 3);
> -    expr_addr_sets_add(addr_sets, "set2", addrs2, 3);
> -    expr_addr_sets_add(addr_sets, "set3", addrs3, 3);
> -    expr_addr_sets_add(addr_sets, "set4", addrs4, 0);
> +    expr_const_sets_add(addr_sets, "set1", addrs1, 3, true);
> +    expr_const_sets_add(addr_sets, "set2", addrs2, 3, true);
> +    expr_const_sets_add(addr_sets, "set3", addrs3, 3, true);
> +    expr_const_sets_add(addr_sets, "set4", addrs4, 0, true);
> +}
> +
> +static void
> +create_port_groups(struct shash *port_groups)
> +{
> +    shash_init(port_groups);
> +
> +    static const char *const pg1[] = {
> +        "lsp1", "lsp2", "lsp3",
> +    };
> +    static const char *const pg2[] = { NULL };
> +
> +    expr_const_sets_add(port_groups, "pg1", pg1, 3, false);
> +    expr_const_sets_add(port_groups, "pg_empty", pg2, 0, false);
>   }
>   
>   static bool
> @@ -245,23 +259,29 @@ test_parse_expr__(int steps)
>   {
>       struct shash symtab;
>       struct shash addr_sets;
> +    struct shash port_groups;
>       struct simap ports;
>       struct ds input;
>   
>       create_symtab(&symtab);
>       create_addr_sets(&addr_sets);
> +    create_port_groups(&port_groups);
>   
>       simap_init(&ports);
>       simap_put(&ports, "eth0", 5);
>       simap_put(&ports, "eth1", 6);
>       simap_put(&ports, "LOCAL", ofp_to_u16(OFPP_LOCAL));
> +    simap_put(&ports, "lsp1", 0x11);
> +    simap_put(&ports, "lsp2", 0x12);
> +    simap_put(&ports, "lsp3", 0x13);
>   
>       ds_init(&input);
>       while (!ds_get_test_line(&input, stdin)) {
>           struct expr *expr;
>           char *error;
>   
> -        expr = expr_parse_string(ds_cstr(&input), &symtab, &addr_sets, &error);
> +        expr = expr_parse_string(ds_cstr(&input), &symtab, &addr_sets,
> +                                 &port_groups, &error);
>           if (!error && steps > 0) {
>               expr = expr_annotate(expr, &symtab, &error);
>           }
> @@ -298,8 +318,10 @@ test_parse_expr__(int steps)
>       simap_destroy(&ports);
>       expr_symtab_destroy(&symtab);
>       shash_destroy(&symtab);
> -    expr_addr_sets_destroy(&addr_sets);
> +    expr_const_sets_destroy(&addr_sets);
>       shash_destroy(&addr_sets);
> +    expr_const_sets_destroy(&port_groups);
> +    shash_destroy(&port_groups);
>   }
>   
>   static void
> @@ -373,7 +395,7 @@ test_evaluate_expr(struct ovs_cmdl_context *ctx)
>       ovn_init_symtab(&symtab);
>   
>       struct flow uflow;
> -    char *error = expr_parse_microflow(ctx->argv[1], &symtab, NULL,
> +    char *error = expr_parse_microflow(ctx->argv[1], &symtab, NULL, NULL,
>                                          lookup_atoi_cb, NULL, &uflow);
>       if (error) {
>           ovs_fatal(0, "%s", error);
> @@ -383,7 +405,7 @@ test_evaluate_expr(struct ovs_cmdl_context *ctx)
>       while (!ds_get_test_line(&input, stdin)) {
>           struct expr *expr;
>   
> -        expr = expr_parse_string(ds_cstr(&input), &symtab, NULL, &error);
> +        expr = expr_parse_string(ds_cstr(&input), &symtab, NULL, NULL, &error);
>           if (!error) {
>               expr = expr_annotate(expr, &symtab, &error);
>           }
> @@ -857,7 +879,8 @@ test_tree_shape_exhaustively(struct expr *expr, struct shash *symtab,
>               expr_format(expr, &s);
>   
>               char *error;
> -            modified = expr_parse_string(ds_cstr(&s), symtab, NULL, &error);
> +            modified = expr_parse_string(ds_cstr(&s), symtab, NULL,
> +                                         NULL, &error);
>               if (error) {
>                   fprintf(stderr, "%s fails to parse (%s)\n",
>                           ds_cstr(&s), error);
> @@ -1163,7 +1186,7 @@ test_expr_to_packets(struct ovs_cmdl_context *ctx OVS_UNUSED)
>       while (!ds_get_test_line(&input, stdin)) {
>           struct flow uflow;
>           char *error = expr_parse_microflow(ds_cstr(&input), &symtab, NULL,
> -                                           lookup_atoi_cb, NULL, &uflow);
> +                                           NULL, lookup_atoi_cb, NULL, &uflow);
>           if (error) {
>               puts(error);
>               free(error);
> 



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