Re: [dpdk-dev] [PATCH 3/4] net/mlx5: add DV encap L2 and L3 operations

[Dekel Peled <dekelp@mellanox.com>]

Thanks, PSB.

> -----Original Message-----
> From: Yongseok Koh
> Sent: Wednesday, October 3, 2018 9:58 AM
> To: Dekel Peled <dekelp@mellanox.com>
> Cc: dev@dpdk.org; Shahaf Shuler <shahafs@mellanox.com>; Ori Kam
> <orika@mellanox.com>
> Subject: Re: [PATCH 3/4] net/mlx5: add DV encap L2 and L3 operations
> 
> On Thu, Sep 27, 2018 at 05:50:44PM +0300, Dekel Peled wrote:
> > This patch adds support for Direct Verbs encap operations, L2 and L3.
> >
> > Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> > ---
> >  drivers/net/mlx5/mlx5_flow_dv.c | 249
> > +++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 244 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> > b/drivers/net/mlx5/mlx5_flow_dv.c index 1f3fcb8..50925ac 100644
> > --- a/drivers/net/mlx5/mlx5_flow_dv.c
> > +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> > @@ -85,6 +85,178 @@
> >  }
> >
> >  /**
> > + * Validate the tunnel encap action.
> > + *
> > + * @param[in] action_flags
> > + *   holds the actions detected until now.
> > + * @param[in] action
> > + *   Pointer to the encap action.
> > + * @param[in] attr
> > + *   Pointer to flow attributes
> > + * @param[out] error
> > + *   Pointer to error structure.
> > + *
> > + * @return
> > + *   0 on success, a negative errno value otherwise and rte_ernno is set.
> > + */
> > +static int
> > +mlx5_flow_validate_action_tunnel_encap(uint64_t action_flags,
> 
> A static func in this file should start from flow_dv_. Or, you can move these
> to mlx5_flow.c as general validation helpers. I prefer the latter.

Renamed functions to flow_dv_validate_action_tunnel_...
Left it as static in mlx5_flow_dv.c, since it is relevant for DV only.

> 
> > +				       const struct rte_flow_action *action,
> > +				       const struct rte_flow_attr *attr,
> > +				       struct rte_flow_error *error) {
> > +	const struct rte_flow_action_tunnel_encap *tunnel_encap =
> > +action->conf;
> > +
> > +	if (!tunnel_encap || !(tunnel_encap->buf))
> > +		return rte_flow_error_set(error, EINVAL,
> > +					  RTE_FLOW_ERROR_TYPE_ACTION,
> > +					  action,
> 
> Two lines above can be merged? Please check others and merge lines as
> much as possible.

Done.

> 
> > +					  "configuration cannot be null");
> > +	if (action_flags & MLX5_ACTION_DROP)
> > +		return rte_flow_error_set(error,
> > +					  ENOTSUP,
> > +					  RTE_FLOW_ERROR_TYPE_ACTION,
> > +					  NULL,
> > +					  "can't drop and encap in same
> flow");
> > +	if (action_flags & (MLX5_ACTION_TUNNEL_ENCAP |
> > +			    MLX5_ACTION_TUNNEL_ENCAP_L3))
> > +		return rte_flow_error_set(error,
> > +					  ENOTSUP,
> > +					  RTE_FLOW_ERROR_TYPE_ACTION,
> > +					  NULL,
> > +					  "can't have 2 encap actions in same"
> > +					  " flow");
> > +	if (attr->ingress)
> > +		return rte_flow_error_set(error, ENOTSUP,
> > +
> 	RTE_FLOW_ERROR_TYPE_ATTR_INGRESS,
> > +					NULL,
> > +					"encap action not supported for "
> > +					"ingress");
> > +	return 0;
> > +}
> > +
> > +/**
> > + * Validate the tunnel encap L3 action
> > + *
> > + * @param[in] action_flags
> > + *   holds the actions detected until now.
> > + * @param[in] action
> > + *   Pointer to the encap action.
> > + * @param[in] attr
> > + *   Pointer to flow attributes
> > + * @param[out] error
> > + *   Pointer to error structure.
> > + *
> > + * @return
> > + *   0 on success, a negative errno value otherwise and rte_ernno is set.
> > + */
> > +static int
> > +mlx5_flow_validate_action_tunnel_encap_l3(uint64_t action_flags,
> > +					  const struct rte_flow_action *action,
> > +					  const struct rte_flow_attr *attr,
> > +					  struct rte_flow_error *error)
> > +{
> > +	const struct rte_flow_action_tunnel_encap_l3 *tunnel_encap_l3 =
> > +								action->conf;
> 
> Indentation.
> 
> 	const struct rte_flow_action_tunnel_encap_l3 *tunnel_encap_l3 =
> 		action->conf;

Done.

> 
> > +
> > +	if (!tunnel_encap_l3 || !(tunnel_encap_l3->buf))
> > +		return rte_flow_error_set(error, EINVAL,
> > +					  RTE_FLOW_ERROR_TYPE_ACTION,
> > +					  action,
> > +					  "configuration cannot be null");
> > +	if (action_flags & MLX5_ACTION_DROP)
> > +		return rte_flow_error_set(error,
> > +					  ENOTSUP,
> > +					  RTE_FLOW_ERROR_TYPE_ACTION,
> > +					  NULL,
> > +					  "can't drop and encap in same
> flow");
> > +	if (action_flags & (MLX5_ACTION_TUNNEL_ENCAP |
> > +			    MLX5_ACTION_TUNNEL_ENCAP_L3))
> > +		return rte_flow_error_set(error,
> > +					  ENOTSUP,
> > +					  RTE_FLOW_ERROR_TYPE_ACTION,
> > +					  NULL,
> > +					  "can't have 2 encap actions in same"
> > +					  " flow");
> > +	if (attr->ingress)
> > +		return rte_flow_error_set(error, ENOTSUP,
> > +
> 	RTE_FLOW_ERROR_TYPE_ATTR_INGRESS,
> > +					NULL,
> > +					"encap action not supported for "
> > +					"ingress");
> > +	return 0;
> > +}
> > +
> > +/**
> > + * Convert encap action to DV specification.
> > + *
> > + * @param[in] action
> > + *   Pointer to action structure.
> > + * @param[in] ctx
> > + *   Verbs context.
> > + * @param[out] error
> > + *   Pointer to the error structure.
> > + *
> > + * @return
> > + *   Pointer to action on success, NULL otherwise and rte_errno is set.
> > + */
> > +static struct ibv_flow_action *
> > +mlx5_flow_dv_create_encap(const struct rte_flow_action *action,
> 
> Change to flow_dv_create_encap()

Done.

> 
> > +			  struct ibv_context *ctx,
> > +			  struct rte_flow_error *error)
> > +{
> > +	struct ibv_flow_action *encap_verb = NULL;
> > +	const struct rte_flow_action_tunnel_encap *encap_data;
> > +
> > +	encap_data = (const struct rte_flow_action_tunnel_encap *)action-
> >conf;
> > +	encap_verb = mlx5_glue-
> >dv_create_flow_action_packet_reformat(ctx,
> > +			encap_data->size,
> > +			encap_data->size ? encap_data->buf :
> > +					   NULL,
> > +
> 	MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TO_L2_TU
> NNEL,
> > +			MLX5DV_FLOW_TABLE_TYPE_NIC_TX);
> 
> Indentation.

I'm using very long MLX5DV_... names defined in rdma-core.
If I use the required indentation I get illegal line length.

> 
> 	encap_verb = mlx5_glue->dv_create_flow_action_packet_reformat
> 		(ctx, encap_data->size,
> 		 encap_data->size ? encap_data->buf : NULL,
> 
> MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TO_L2_TUNNEL,
> 		 MLX5DV_FLOW_TABLE_TYPE_NIC_TX);
> 
> Please make the same change to others.
> 
> > +	if (!encap_verb)
> > +		rte_flow_error_set(error, EINVAL,
> RTE_FLOW_ERROR_TYPE_ACTION,
> > +				   NULL, "cannot create encap action");
> > +	return encap_verb;
> > +}
> > +
> > +/**
> > + * Convert encap L3 action to DV specification.
> > + *
> > + * @param[in] action
> > + *   Pointer to action structure.
> > + * @param[in] ctx
> > + *   Verbs context.
> > + * @param[out] error
> > + *   Pointer to the error structure.
> > + *
> > + * @return
> > + *   Pointer to action on success, NULL otherwise and rte_errno is set.
> > + */
> > +static struct ibv_flow_action *
> > +mlx5_flow_dv_create_encap_l3(const struct rte_flow_action *action,
> 
> Change to flow_dv_create_encap_l3()

Done.

> 
> > +			     struct ibv_context *ctx,
> > +			     struct rte_flow_error *error) {
> > +	struct ibv_flow_action *encap_l3_verb = NULL;
> > +	const struct rte_flow_action_tunnel_encap_l3 *encap_l3_data;
> > +
> > +	encap_l3_data =
> > +		(const struct rte_flow_action_tunnel_encap_l3 *)action-
> >conf;
> > +	encap_l3_verb = mlx5_glue-
> >dv_create_flow_action_packet_reformat(ctx,
> > +			encap_l3_data->size,
> > +			encap_l3_data->size ? encap_l3_data->buf :
> > +					      NULL,
> > +
> 	MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TO_L3_TU
> NNEL,
> > +			MLX5DV_FLOW_TABLE_TYPE_NIC_TX);
> > +	if (!encap_l3_verb)
> > +		rte_flow_error_set(error, EINVAL,
> RTE_FLOW_ERROR_TYPE_ACTION,
> > +				   NULL, "cannot create encap L3 action");
> > +	return encap_l3_verb;
> > +}
> > +
> > +/**
> >   * Verify the @p attributes will be correctly understood by the NIC and
> store
> >   * them in the @p flow if everything is correct.
> >   *
> > @@ -337,6 +509,26 @@
> >  			action_flags |= MLX5_ACTION_COUNT;
> >  			++actions_n;
> >  			break;
> > +		case RTE_FLOW_ACTION_TYPE_TUNNEL_ENCAP:
> > +			ret = mlx5_flow_validate_action_tunnel_encap
> > +				(action_flags,
> > +				 actions,
> > +				 attr,
> > +				 error);
> 
> Can be one line.

Done.

> 
> > +			if (ret < 0)
> > +				return ret;
> > +			action_flags |= MLX5_ACTION_TUNNEL_ENCAP;
> > +			break;
> > +		case RTE_FLOW_ACTION_TYPE_TUNNEL_ENCAP_L3:
> > +			ret = mlx5_flow_validate_action_tunnel_encap_l3
> > +				(action_flags,
> > +				 actions,
> > +				 attr,
> > +				 error);
> > +			if (ret < 0)
> > +				return ret;
> > +			action_flags |= MLX5_ACTION_TUNNEL_ENCAP_L3;
> > +			break;
> >  		default:
> >  			return rte_flow_error_set(error, ENOTSUP,
> >
> RTE_FLOW_ERROR_TYPE_ACTION,
> > @@ -1047,10 +1239,19 @@
> >   *   Flow action to translate.
> >   * @param[in, out] dev_flow
> >   *   Pointer to the mlx5_flow.
> > + * @param[in] ctx
> > + *   Verbs context.
> > + * @param[out] error
> > + *   Pointer to the error structure.
> > + *
> > + * @return
> > + *   0 on success, a negative errno value otherwise and rte_ernno is set.
> >   */
> > -static void
> > +static int
> >  flow_dv_create_action(const struct rte_flow_action *action,
> > -		      struct mlx5_flow *dev_flow)
> > +		      struct mlx5_flow *dev_flow,
> > +		      struct ibv_context *ctx,
> 
> If it is just priv->ctx, it would be better to get dev as an arg and make
> mlx5_flow_dv_create_encap*(dev, ...) gets priv->ctx from dev.

I considered it during implementation, but preferred to give the functions only what they need.

> 
> > +		      struct rte_flow_error *error)
> >  {
> >  	const struct rte_flow_action_queue *queue;
> >  	const struct rte_flow_action_rss *rss; @@ -1095,10 +1296,35 @@
> >  		/* Added to array only in apply since we need the QP */
> >  		flow->actions |= MLX5_ACTION_RSS;
> >  		break;
> > +	case RTE_FLOW_ACTION_TYPE_TUNNEL_ENCAP:
> > +		dev_flow->dv.actions[actions_n].type =
> > +			MLX5DV_FLOW_ACTION_IBV_FLOW_ACTION;
> > +		dev_flow->dv.actions[actions_n].action =
> > +			mlx5_flow_dv_create_encap(action, ctx, error);
> > +		if (!(dev_flow->dv.actions[actions_n].action))
> > +			return -rte_errno;
> > +		dev_flow->dv.encap_verb =
> > +			dev_flow->dv.actions[actions_n].action;
> > +		flow->actions |= MLX5_ACTION_TUNNEL_ENCAP;
> > +		actions_n++;
> > +		break;
> > +	case RTE_FLOW_ACTION_TYPE_TUNNEL_ENCAP_L3:
> > +		dev_flow->dv.actions[actions_n].type =
> > +			MLX5DV_FLOW_ACTION_IBV_FLOW_ACTION;
> > +		dev_flow->dv.actions[actions_n].action =
> > +			mlx5_flow_dv_create_encap_l3(action, ctx, error);
> > +		if (!(dev_flow->dv.actions[actions_n].action))
> > +			return -rte_errno;
> > +		dev_flow->dv.encap_verb =
> > +			dev_flow->dv.actions[actions_n].action;
> > +		flow->actions |= MLX5_ACTION_TUNNEL_ENCAP_L3;
> > +		actions_n++;
> > +		break;
> >  	default:
> >  		break;
> >  	}
> >  	dev_flow->dv.actions_n = actions_n;
> > +	return 0;
> >  }
> >
> >  static uint32_t matcher_zero[MLX5_ST_SZ_DW(fte_match_param)] = { 0 };
> > @@ -1247,6 +1473,7 @@
> >  	};
> >  	void *match_value = dev_flow->dv.value.buf;
> >  	uint8_t inner = 0;
> > +	int retval = 0;
> >
> >  	if (priority == MLX5_FLOW_PRIO_RSVD)
> >  		priority = priv->config.flow_prio - 1; @@ -1262,9 +1489,14
> @@
> >  	matcher.egress = attr->egress;
> >  	if (flow_dv_matcher_register(dev, &matcher, dev_flow, error))
> >  		return -rte_errno;
> > -	for (; actions->type != RTE_FLOW_ACTION_TYPE_END; actions++)
> > -		flow_dv_create_action(actions, dev_flow);
> > -	return 0;
> > +	for (; actions->type != RTE_FLOW_ACTION_TYPE_END; actions++) {
> > +		retval =
> > +		flow_dv_create_action(actions, dev_flow, priv->ctx, error);
> > +		if (retval)
> > +			break;
> 
> The following looks better matched?
> 
> 		if (flow_dv_create_action(dev, actions, dev_flow, error))
> 			return -rte_errno;
> 
> And leave 'return 0;' as is below.

OK.

> 
> BTW, flow_dv_matcher_register() allocates mlx5_flow_dv_matcher or
> increase the refcnt. Then, if it fails here, doesn't it need to clean that up?
> 
> > +	}
> > +
> 
> No blank line is allowed. Please fix other occurrences too.

Done.

> 
> > +	return retval;
> >  }
> >
> >  /**
> > @@ -1447,6 +1679,13 @@
> >  		LIST_REMOVE(dev_flow, next);
> >  		if (dev_flow->dv.matcher)
> >  			flow_dv_matcher_release(dev, dev_flow-
> >dv.matcher);
> > +
> > +		if (dev_flow->dv.encap_verb) {
> > +			claim_zero(mlx5_glue->destroy_flow_action
> > +						(dev_flow->dv.encap_verb));
> > +			dev_flow->dv.encap_verb = NULL;
> > +		}
> > +
> >  		rte_free(dev_flow);
> >  	}
> >  }
> > --
> > 1.8.3.1
> >