Re: [dpdk-dev] [PATCH] net/mlx5: allow install more meter actions

[Suanming Mou <suanmingm@mellanox.com>]

Hello Tonghao,

Could you please explain much detail about your issue scenario?

If I understand correctly, you are trying to create two flows with the two same match criteria?

Example from testpmd just like that:
add port meter profile srtcm_rfc2697 0 24 65536 32768 0
create port  meter 0 0 24 yes G Y D 0xffff 1 0
flow create 0 ingress pattern eth / end actions  jump group 1 / end
flow create 0 priority 3 group 1 ingress pattern eth / end actions meter mtr_id 0 / queue index 0 / end
flow create 0 priority 3 group 1 ingress pattern eth / end actions meter mtr_id 0 / queue index 1 / end

Then the third flow will report "hardware refuses to create flow: Invalid argument".

Please correct me if I'm wrong.
And better to give the issue reproduce method via testpmd cmdline.

Thanks
SuanmingMou

> -----Original Message-----
> From: Tonghao Zhang <xiangxia.m.yue@gmail.com>
> Sent: Thursday, December 19, 2019 6:00 PM
> To: Suanming Mou <suanmingm@mellanox.com>
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: Re: [PATCH] net/mlx5: allow install more meter actions
> 
> ping
> 
> On Tue, Dec 17, 2019 at 3:29 PM <xiangxia.m.yue@gmail.com> wrote:
> >
> > From: Tonghao Zhang <xiangxia.m.yue@gmail.com>
> >
> > When creating the dr rule of meter, the matcher which struct is
> > "struct mlx5dv_dr_matcher" should not be shared, if shared,
> > mlx5dv_dr_rule_create will return NULL. We can't install more metering
> > offload actions.
> >
> > The call tree (rdma-core-47mlnx1 OFED 4.7-3.2.9):
> > * dr_rule_handle_ste_branch
> > * dr_rule_create_rule_nic
> > * dr_rule_create_rule_fdb
> > * dr_rule_create_rule
> > * mlx5dv_dr_rule_create
> >
> > In the dr_rule_handle_ste_branch, if ste is not used,
> > mlx5dv_dr_rule_create will return rule, if the ste is used, and the
> > ste is the last in the rule, mlx5dv_dr_rule_create will return NULL.
> >
> > dr_rule_handle_ste_branch:
> >     if dr_ste_not_used_ste
> >         dr_rule_handle_empty_entry
> >     else
> >         dr_rule_find_ste_in_miss_list
> >         dr_ste_is_last_in_rule: if so return NULL and set errno =
> > EINVAL;
> >
> > Fixes: 9ea9b049a960 ("net/mlx5: split meter flow")
> > Cc: Suanming Mou <suanmingm@mellanox.com>
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
> > ---
> >  drivers/net/mlx5/mlx5_flow.c    | 20 +++++++++++++-------
> >  drivers/net/mlx5/mlx5_flow.h    |  2 ++
> >  drivers/net/mlx5/mlx5_flow_dv.c |  5 +++++
> >  3 files changed, 20 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5_flow.c
> > b/drivers/net/mlx5/mlx5_flow.c index 0087163..f8cdc25 100644
> > --- a/drivers/net/mlx5/mlx5_flow.c
> > +++ b/drivers/net/mlx5/mlx5_flow.c
> > @@ -3421,7 +3421,9 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
> >                         const struct rte_flow_attr *attr,
> >                         const struct rte_flow_item items[],
> >                         const struct rte_flow_action actions[],
> > -                       bool external, struct rte_flow_error *error)
> > +                       bool external,
> > +                       bool shared,
> > +                       struct rte_flow_error *error)
> >  {
> >         struct mlx5_flow *dev_flow;
> >
> > @@ -3434,6 +3436,7 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
> >         LIST_INSERT_HEAD(&flow->dev_flows, dev_flow, next);
> >         if (sub_flow)
> >                 *sub_flow = dev_flow;
> > +       dev_flow->matcher_shared = shared;
> >         return flow_drv_translate(dev, dev_flow, attr, items, actions,
> > error);  }
> >
> > @@ -3741,7 +3744,9 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
> >                            const struct rte_flow_attr *attr,
> >                            const struct rte_flow_item items[],
> >                            const struct rte_flow_action actions[],
> > -                          bool external, struct rte_flow_error *error)
> > +                          bool external,
> > +                          bool shared,
> > +                          struct rte_flow_error *error)
> >  {
> >         struct mlx5_priv *priv = dev->data->dev_private;
> >         struct mlx5_dev_config *config = &priv->config; @@ -3759,7
> > +3764,8 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev,
> int32_t priority,
> >             config->dv_xmeta_en == MLX5_XMETA_MODE_LEGACY ||
> >             !mlx5_flow_ext_mreg_supported(dev))
> >                 return flow_create_split_inner(dev, flow, NULL, attr, items,
> > -                                              actions, external, error);
> > +                                              actions, external,
> > +                                              shared, error);
> >         actions_n = flow_parse_qrss_action(actions, &qrss);
> >         if (qrss) {
> >                 /* Exclude hairpin flows from splitting. */ @@ -3842,7
> > +3848,7 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev,
> int32_t priority,
> >         /* Add the unmodified original or prefix subflow. */
> >         ret = flow_create_split_inner(dev, flow, &dev_flow, attr, items,
> >                                       ext_actions ? ext_actions : actions,
> > -                                     external, error);
> > +                                     external, shared, error);
> >         if (ret < 0)
> >                 goto exit;
> >         assert(dev_flow);
> > @@ -3906,7 +3912,7 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
> >                 ret = flow_create_split_inner(dev, flow, &dev_flow,
> >                                               &q_attr, mtr_sfx ? items :
> >                                               q_items, q_actions,
> > -                                             external, error);
> > +                                             external, shared,
> > + error);
> >                 if (ret < 0)
> >                         goto exit;
> >                 assert(dev_flow);
> > @@ -3999,7 +4005,7 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
> >                 }
> >                 /* Add the prefix subflow. */
> >                 ret = flow_create_split_inner(dev, flow, &dev_flow, attr, items,
> > -                                                 pre_actions, external, error);
> > +                                             pre_actions, external,
> > + false, error);
> >                 if (ret) {
> >                         ret = -rte_errno;
> >                         goto exit;
> > @@ -4035,7 +4041,7 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
> >         ret = flow_create_split_metadata(dev, flow, &sfx_attr,
> >                                          sfx_items ? sfx_items : items,
> >                                          sfx_actions ? sfx_actions : actions,
> > -                                        external, error);
> > +                                        external, sfx_items == NULL,
> > + error);
> >  exit:
> >         if (sfx_actions)
> >                 rte_free(sfx_actions); diff --git
> > a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h index
> > 3fff5dd..84636be 100644
> > --- a/drivers/net/mlx5/mlx5_flow.h
> > +++ b/drivers/net/mlx5/mlx5_flow.h
> > @@ -338,6 +338,7 @@ struct mlx5_flow_dv_matcher {
> >         /**< Pointer to the table(group) the matcher associated with. */
> >         rte_atomic32_t refcnt; /**< Reference counter. */
> >         void *matcher_object; /**< Pointer to DV matcher */
> > +       bool shared;
> >         uint16_t crc; /**< CRC of key. */
> >         uint16_t priority; /**< Priority of matcher. */
> >         struct mlx5_flow_dv_match_params mask; /**< Matcher mask. */
> > @@ -532,6 +533,7 @@ struct mlx5_flow {
> >                 uint32_t mtr_flow_id; /**< Unique meter match flow id. */
> >         };
> >         bool external; /**< true if the flow is created external to
> > PMD. */
> > +       bool matcher_shared;
> >  };
> >
> >  /* Flow meter state. */
> > diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> > b/drivers/net/mlx5/mlx5_flow_dv.c index 7528556..362c36c 100644
> > --- a/drivers/net/mlx5/mlx5_flow_dv.c
> > +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> > @@ -6324,10 +6324,13 @@ struct field_modify_info modify_tcp[] = {
> >         if (!tbl)
> >                 return -rte_errno;      /* No need to refill the error info */
> >         tbl_data = container_of(tbl, struct mlx5_flow_tbl_data_entry,
> > tbl);
> > +       if (!dev_flow->matcher_shared)
> > +               goto create_matcher;
> >         /* Lookup from cache. */
> >         LIST_FOREACH(cache_matcher, &tbl_data->matchers, next) {
> >                 if (matcher->crc == cache_matcher->crc &&
> >                     matcher->priority == cache_matcher->priority &&
> > +                   cache_matcher->shared &&
> >                     !memcmp((const void *)matcher->mask.buf,
> >                             (const void *)cache_matcher->mask.buf,
> >                             cache_matcher->mask.size)) { @@ -6346,6
> > +6349,7 @@ struct field_modify_info modify_tcp[] = {
> >                         return 0;
> >                 }
> >         }
> > +create_matcher:
> >         /* Register new matcher. */
> >         cache_matcher = rte_calloc(__func__, 1, sizeof(*cache_matcher), 0);
> >         if (!cache_matcher) {
> > @@ -6355,6 +6359,7 @@ struct field_modify_info modify_tcp[] = {
> >                                           "cannot allocate matcher memory");
> >         }
> >         *cache_matcher = *matcher;
> > +       cache_matcher->shared = dev_flow->matcher_shared;
> >         dv_attr.match_criteria_enable =
> >                 flow_dv_matcher_enable(cache_matcher->mask.buf);
> >         dv_attr.priority = matcher->priority;
> > --
> > 1.8.3.1
> >