[ovs-dev] [PATCH 1/2] OVN: add meter support to trigger_event action

[Lorenzo Bianconi]

>
> I noticed this patch introduced a memory leak since event->meter is
> never freed.
>
> However, I can understand how this happened because currently everything
> in ovnact_controller_event is being leaked.
> ovnact_controller_event_free() should be calling free_gen_options(), but
> it's not. And with this patch, it should now also free event->meter.
>
> To avoid convoluting the purpose of each patch, I think the easiest way
> to handle this is to submit a v2, where the first patch fixes the
> existing memory leak. Then patch 2 can be this one, with the added
> freeing of event->meter. And the current patch 2 of this changeset can
> become patch 3.

Hi Mark,

ack, I agree. I will post v2 soon. Thanks.

Regards,
Lorenzo

>
> The memory leak fix will need to be backported to OVS 2.12 as well.
>
> On 8/1/19 5:56 AM, Lorenzo Bianconi wrote:
> > Introduce meter support to trigger_event action in order to not
> > overload pinctrl thread under heavy load
> >
> > Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi at redhat.com>
> > ---
> >   include/ovn/actions.h |  1 +
> >   lib/actions.c         | 42 ++++++++++++++++++++++++++++++++++++------
> >   2 files changed, 37 insertions(+), 6 deletions(-)
> >
> > diff --git a/include/ovn/actions.h b/include/ovn/actions.h
> > index 63d3907d8..1f2ac2eb2 100644
> > --- a/include/ovn/actions.h
> > +++ b/include/ovn/actions.h
> > @@ -326,6 +326,7 @@ struct ovnact_controller_event {
> >       int event_type;   /* controller event type */
> >       struct ovnact_gen_option *options;
> >       size_t n_options;
> > +    char *meter;
> >   };
> >
> >   /* Internal use by the helpers below. */
> > diff --git a/lib/actions.c b/lib/actions.c
> > index 4eacc44ed..2e321d82e 100644
> > --- a/lib/actions.c
> > +++ b/lib/actions.c
> > @@ -1273,6 +1273,9 @@ format_TRIGGER_EVENT(const struct ovnact_controller_event *event,
> >   {
> >       ds_put_format(s, "trigger_event(event = \"%s\"",
> >                     event_to_string(event->event_type));
> > +    if (event->meter) {
> > +        ds_put_format(s, ", meter = \"%s\"", event->meter);
> > +    }
> >       for (const struct ovnact_gen_option *o = event->options;
> >            o < &event->options[event->n_options]; o++) {
> >           ds_put_cstr(s, ", ");
> > @@ -1420,10 +1423,21 @@ encode_TRIGGER_EVENT(const struct ovnact_controller_event *event,
> >                        const struct ovnact_encode_params *ep OVS_UNUSED,
> >                        struct ofpbuf *ofpacts)
> >   {
> > +    uint32_t meter_id = NX_CTLR_NO_METER;
> >       size_t oc_offset;
> >
> > +    if (event->meter) {
> > +        meter_id = ovn_extend_table_assign_id(ep->meter_table, event->meter,
> > +                                              ep->lflow_uuid);
> > +        if (meter_id == EXT_TABLE_ID_INVALID) {
> > +            VLOG_WARN("Unable to assign id for trigger meter: %s",
> > +                      event->meter);
> > +            return;
> > +        }
> > +    }
> > +
> >       oc_offset = encode_start_controller_op(ACTION_OPCODE_EVENT, false,
> > -                                           NX_CTLR_NO_METER, ofpacts);
> > +                                           meter_id, ofpacts);
> >       ovs_be32 ofs = htonl(event->event_type);
> >       ofpbuf_put(ofpacts, &ofs, sizeof ofs);
> >
> > @@ -1738,11 +1752,27 @@ parse_trigger_event(struct action_context *ctx,
> >                                        sizeof *event->options);
> >           }
> >
> > -        struct ovnact_gen_option *o = &event->options[event->n_options++];
> > -        memset(o, 0, sizeof *o);
> > -        parse_gen_opt(ctx, o,
> > -                      &ctx->pp->controller_event_opts->event_opts[event_type],
> > -                      event_to_string(event_type));
> > +        if (lexer_match_id(ctx->lexer, "meter")) {
> > +            if (!lexer_force_match(ctx->lexer, LEX_T_EQUALS)) {
> > +                return;
> > +            }
> > +            /* If multiple meters are given, use the most recent. */
> > +            if (ctx->lexer->token.type == LEX_T_STRING &&
> > +                strlen(ctx->lexer->token.s)) {
> > +                free(event->meter);
> > +                event->meter = xstrdup(ctx->lexer->token.s);
> > +            } else if (ctx->lexer->token.type != LEX_T_STRING) {
> > +                lexer_syntax_error(ctx->lexer, "expecting string");
> > +                return;
> > +            }
> > +            lexer_get(ctx->lexer);
> > +        } else {
> > +            struct ovnact_gen_option *o = &event->options[event->n_options++];
> > +            memset(o, 0, sizeof *o);
> > +            parse_gen_opt(ctx, o,
> > +                    &ctx->pp->controller_event_opts->event_opts[event_type],
> > +                    event_to_string(event_type));
> > +            }
> >           if (ctx->lexer->error) {
> >               return;
> >           }
> >
>
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