[dpdk-dev] [PATCH v2 1/4] ethdev: allow negative values in flow rule types

[Gregory Etelson]

> On 9/8/20 11:15 PM, Gregory Etelson wrote:
> > From: Gregory Etelson <getelson at mellanox.com>
> >
> > RTE flow items & actions use positive values in item & action type.
> > Negative values are reserved for PMD private types. PMD items &
> > actions usually are not exposed to application and are not used to
> > create RTE flows.
> >
> > The patch allows applications with access to PMD flow items & actions
> > ability to integrate RTE and PMD items & actions and use them to
> > create flow rule.
> >
> > RTE flow library functions cannot work with PMD private items and
> > actions (elements) because RTE flow has no API to query PMD flow
> > object size. In the patch, PMD flow elements use object pointer.
> > RTE flow library functions handle PMD element object size as size of a
> > pointer. PMD handles its objects internally.
> >
> > Signed-off-by: Gregory Etelson <getelson at mellanox.com>
> > Acked-by: Ori Kam <orika at mellanox.com>
> > ---
> > v2:
> > * Update commit log
> > ---
> >  lib/librte_ethdev/rte_flow.c | 30 ++++++++++++++++++++++++------
> >  1 file changed, 24 insertions(+), 6 deletions(-)
> >
> > diff --git a/lib/librte_ethdev/rte_flow.c
> > b/lib/librte_ethdev/rte_flow.c index f8fdd68fe9..9905426bc9 100644
> > --- a/lib/librte_ethdev/rte_flow.c
> > +++ b/lib/librte_ethdev/rte_flow.c
> > @@ -564,7 +564,12 @@ rte_flow_conv_item_spec(void *buf, const size_t
> size,
> >               }
> >               break;
> >       default:
> > -             off = rte_flow_desc_item[item->type].size;
> > +             /**
> > +              * allow PMD private flow item
> > +              */
> > +             off = (uint32_t)item->type <= INT_MAX ?
> 
> It looks inconsistent to cast to uint32_t and compare vs INT_MAX. It should
> be either cast to 'unsigned int' or compare vs INT32_MAX. I think cast to
> 'unsigned int' is better for 'enum' values.
> But may be it should be 'int' and < 0 in fact to match the description that
> negative values are vendor-specific.
> 

I'll update PMD private item verification to 
(int) item->type < 0
In the next patch release.
The same applies to PMD private actions verification

> > +                     rte_flow_desc_item[item->type].size :
> > +                     sizeof(void *);
> >               rte_memcpy(buf, data, (size > off ? off : size));
> >               break;
> >       }
> > @@ -667,7 +672,12 @@ rte_flow_conv_action_conf(void *buf, const size_t
> size,
> >               }
> >               break;
> >       default:
> > -             off = rte_flow_desc_action[action->type].size;
> > +             /**
> > +              * allow PMD private flow action
> > +              */
> > +             off = (uint32_t)action->type <= INT_MAX ?
> 
> Same
> 
> > +                     rte_flow_desc_action[action->type].size :
> > +                     sizeof(void *);
> >               rte_memcpy(buf, action->conf, (size > off ? off : size));
> >               break;
> >       }
> > @@ -709,8 +719,12 @@ rte_flow_conv_pattern(struct rte_flow_item *dst,
> >       unsigned int i;
> >
> >       for (i = 0, off = 0; !num || i != num; ++i, ++src, ++dst) {
> > -             if ((size_t)src->type >= RTE_DIM(rte_flow_desc_item) ||
> > -                 !rte_flow_desc_item[src->type].name)
> > +             /**
> > +              * allow PMD private flow item
> > +              */
> > +             if (((uint32_t)src->type <= INT_MAX) &&
> 
> Same
> 
> > +                     ((size_t)src->type >= RTE_DIM(rte_flow_desc_item) ||
> > +                 !rte_flow_desc_item[src->type].name))
> >                       return rte_flow_error_set
> >                               (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM, src,
> >                                "cannot convert unknown item type"); @@
> > -798,8 +812,12 @@ rte_flow_conv_actions(struct rte_flow_action *dst,
> >       unsigned int i;
> >
> >       for (i = 0, off = 0; !num || i != num; ++i, ++src, ++dst) {
> > -             if ((size_t)src->type >= RTE_DIM(rte_flow_desc_action) ||
> > -                 !rte_flow_desc_action[src->type].name)
> > +             /**
> > +              * allow PMD private flow action
> > +              */
> > +             if (((uint32_t)src->type <= INT_MAX) &&
> 
> Same
> 
> > +                 ((size_t)src->type >= RTE_DIM(rte_flow_desc_action) ||
> > +                 !rte_flow_desc_action[src->type].name))
> >                       return rte_flow_error_set
> >                               (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ACTION,
> >                                src, "cannot convert unknown action
> > type");
> >