[dpdk-dev] [PATCH v7 7/7] net/mlx5: add caching of encap decap actions
Dekel Peled
dekelp at mellanox.com
Thu Nov 1 10:15:42 CET 2018
Thanks, PSB.
> -----Original Message-----
> From: Shahaf Shuler
> Sent: Wednesday, October 31, 2018 5:10 PM
> To: Dekel Peled <dekelp at mellanox.com>; Yongseok Koh
> <yskoh at mellanox.com>
> Cc: dev at dpdk.org; Ori Kam <orika at mellanox.com>
> Subject: RE: [dpdk-dev] [PATCH v7 7/7] net/mlx5: add caching of encap
> decap actions
>
> Wednesday, October 31, 2018 9:11 AM, Dekel Peled:
> > Subject: [dpdk-dev] [PATCH v7 7/7] net/mlx5: add caching of encap
> > decap actions
> >
> > Make flow encap and decap Verbs actions cacheable resources.
> > Reuse 17.11 PR 876.
>
> No one knows what is PR 876 in the mailing list, also this code is not in 17.11
> community.
> Need to make a proper commit log here explains how you do the caching and
> why it is needed.
Will change.
>
> >
> > Signed-off-by: Dekel Peled <dekelp at mellanox.com>
> > ---
> > drivers/net/mlx5/mlx5.h | 1 +
> > drivers/net/mlx5/mlx5_flow.h | 18 ++-
> > drivers/net/mlx5/mlx5_flow_dv.c | 265
> ++++++++++++++++++++++++++---
> > -----------
> > 3 files changed, 193 insertions(+), 91 deletions(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h index
> > 74d87c0..0422803 100644
> > --- a/drivers/net/mlx5/mlx5.h
> > +++ b/drivers/net/mlx5/mlx5.h
> > @@ -219,6 +219,7 @@ struct priv {
> > /* Verbs Indirection tables. */
> > LIST_HEAD(ind_tables, mlx5_ind_table_ibv) ind_tbls;
> > LIST_HEAD(matchers, mlx5_flow_dv_matcher) matchers;
> > + LIST_HEAD(encap_decap, mlx5_flow_dv_encap_decap_resource)
> > +encaps_decaps;
> > uint32_t link_speed_capa; /* Link speed capabilities. */
> > struct mlx5_xstats_ctrl xstats_ctrl; /* Extended stats control. */
> > int primary_socket; /* Unix socket for primary process. */ diff
> > --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
> > index
> > 908123f..25cd9c5 100644
> > --- a/drivers/net/mlx5/mlx5_flow.h
> > +++ b/drivers/net/mlx5/mlx5_flow.h
> > @@ -170,6 +170,7 @@ struct mlx5_flow_dv_match_params { };
> >
> > #define MLX5_DV_MAX_NUMBER_OF_ACTIONS 8
> > +#define MLX5_ENCAP_MAX_LEN 132
> >
> > /* Matcher structure. */
> > struct mlx5_flow_dv_matcher {
> > @@ -183,6 +184,19 @@ struct mlx5_flow_dv_matcher {
> > struct mlx5_flow_dv_match_params mask; /**< Matcher mask. */ };
> >
> > +/* Encap/decap resource structure. */ struct
> > +mlx5_flow_dv_encap_decap_resource {
> > + LIST_ENTRY(mlx5_flow_dv_encap_decap_resource) next;
> > + /* Pointer to next element. */
> > + rte_atomic32_t refcnt; /**< Reference counter. */
> > + struct ibv_flow_action *verbs_action;
> > + /**< Verbs encap/decap action object. */
> > + uint8_t buf[MLX5_ENCAP_MAX_LEN];
> > + size_t size;
> > + uint8_t reformat_type;
> > + uint8_t ft_type;
> > +};
> > +
> > /* DV flows structure. */
> > struct mlx5_flow_dv {
> > uint64_t hash_fields; /**< Fields that participate in the hash. */
> > @@
> > -191,12 +205,12 @@ struct mlx5_flow_dv {
> > struct mlx5_flow_dv_matcher *matcher; /**< Cache to matcher. */
> > struct mlx5_flow_dv_match_params value;
> > /**< Holds the value that the packet is compared to. */
> > + struct mlx5_flow_dv_encap_decap_resource *encap_decap;
> > + /**< Pointer to encap/decap resource in cache. */
> > struct ibv_flow *flow; /**< Installed flow. */ #ifdef
> > HAVE_IBV_FLOW_DV_SUPPORT
> > struct mlx5dv_flow_action_attr
> > actions[MLX5_DV_MAX_NUMBER_OF_ACTIONS];
> > /**< Action list. */
> > - struct ibv_flow_action *encap_decap_verbs_action;
> > - /**< Verbs encap/decap object. */
> > #endif
> > int actions_n; /**< number of actions. */ }; diff --git
> > a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
> > index d1c811f..818b30c 100644
> > --- a/drivers/net/mlx5/mlx5_flow_dv.c
> > +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> > @@ -34,8 +34,6 @@
> >
> > #ifdef HAVE_IBV_FLOW_DV_SUPPORT
> >
> > -#define MLX5_ENCAP_MAX_LEN 132
> > -
> > /**
> > * Validate META item.
> > *
> > @@ -271,6 +269,77 @@
> > return 0;
> > }
> >
> > +
> > +/**
> > + * Find existing encap/decap resource or create and register a new one.
> > + *
> > + * @param dev[in, out]
> > + * Pointer to rte_eth_dev structure.
> > + * @param[in, out] resource
> > + * Pointer to encap/decap resource.
> > + * @parm[in, out] dev_flow
> > + * Pointer to the dev_flow.
> > + * @param[out] error
> > + * pointer to error structure.
> > + *
> > + * @return
> > + * 0 on success otherwise -errno and errno is set.
> > + */
> > +static int
> > +flow_dv_encap_decap_resource_register
> > + (struct rte_eth_dev *dev,
> > + struct mlx5_flow_dv_encap_decap_resource
> > *resource,
> > + struct mlx5_flow *dev_flow,
> > + struct rte_flow_error *error)
> > +{
> > + struct priv *priv = dev->data->dev_private;
> > + struct mlx5_flow_dv_encap_decap_resource *cache_resource;
> > +
> > + /* Lookup a matching resource from cache. */
> > + LIST_FOREACH(cache_resource, &priv->encaps_decaps, next) {
> > + if (resource->reformat_type == cache_resource-
> > >reformat_type &&
> > + resource->ft_type == cache_resource->ft_type &&
> > + resource->size == cache_resource->size &&
> > + !memcmp((const void *)resource->buf,
> > + (const void *)cache_resource->buf,
> > + resource->size)) {
> > + DRV_LOG(DEBUG, "encap/decap resource %p: refcnt
> > %d++",
> > + (void *)cache_resource,
> > + rte_atomic32_read(&cache_resource-
> > >refcnt));
> > + rte_atomic32_inc(&cache_resource->refcnt);
> > + dev_flow->dv.encap_decap = cache_resource;
> > + return 0;
> > + }
> > + }
> > + /* Register new encap/decap resource. */
> > + cache_resource = rte_calloc(__func__, 1, sizeof(*cache_resource),
> > 0);
> > + if (!cache_resource)
> > + return rte_flow_error_set(error, ENOMEM,
> > +
> > RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
> > + "cannot allocate resource
> > memory");
> > + *cache_resource = *resource;
> > + cache_resource->verbs_action =
> > + mlx5_glue->dv_create_flow_action_packet_reformat
> > + (priv->ctx, cache_resource->size,
> > + (cache_resource->size ? cache_resource->buf :
> > NULL),
> > + cache_resource->reformat_type,
> > + cache_resource->ft_type);
> > + if (!cache_resource->verbs_action) {
> > + rte_free(cache_resource);
> > + return rte_flow_error_set(error, ENOMEM,
> > +
> > RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
> > + NULL, "cannot create action");
> > + }
> > + rte_atomic32_init(&cache_resource->refcnt);
> > + rte_atomic32_inc(&cache_resource->refcnt);
> > + LIST_INSERT_HEAD(&priv->encaps_decaps, cache_resource, next);
> > + dev_flow->dv.encap_decap = cache_resource;
> > + DRV_LOG(DEBUG, "new encap/decap resource %p: refcnt %d++",
> > + (void *)cache_resource,
> > + rte_atomic32_read(&cache_resource->refcnt));
> > + return 0;
> > +}
> > +
> > /**
> > * Get the size of specific rte_flow_item_type
> > *
> > @@ -505,31 +574,33 @@
> > * Pointer to rte_eth_dev structure.
> > * @param[in] action
> > * Pointer to action structure.
> > + * @param[in, out] dev_flow
> > + * Pointer to the mlx5_flow.
> > * @param[out] error
> > * Pointer to the error structure.
> > *
> > * @return
> > - * Pointer to action on success, NULL otherwise and rte_errno is set.
> > + * 0 on success, a negative errno value otherwise and rte_errno is set.
> > */
> > -static struct ibv_flow_action *
> > +static int
> > flow_dv_create_action_l2_encap(struct rte_eth_dev *dev,
> > const struct rte_flow_action *action,
> > + struct mlx5_flow *dev_flow,
> > struct rte_flow_error *error) {
> > - struct ibv_flow_action *verbs_action = NULL;
> > const struct rte_flow_item *encap_data;
> > const struct rte_flow_action_raw_encap *raw_encap_data;
> > - struct priv *priv = dev->data->dev_private;
> > - uint8_t buf[MLX5_ENCAP_MAX_LEN];
> > - uint8_t *buf_ptr = buf;
> > - size_t size = 0;
> > - int convert_result = 0;
> > + struct mlx5_flow_dv_encap_decap_resource res = {
> > + .reformat_type =
> > +
> > MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TO_L2_TU
> > NNEL,
> > + .ft_type = MLX5DV_FLOW_TABLE_TYPE_NIC_TX,
> > + };
> >
> > if (action->type == RTE_FLOW_ACTION_TYPE_RAW_ENCAP) {
> > raw_encap_data =
> > (const struct rte_flow_action_raw_encap *)action-
> > >conf;
> > - buf_ptr = raw_encap_data->data;
> > - size = raw_encap_data->size;
> > + res.size = raw_encap_data->size;
> > + memcpy(res.buf, raw_encap_data->data, res.size);
> > } else {
> > if (action->type ==
> > RTE_FLOW_ACTION_TYPE_VXLAN_ENCAP)
> > encap_data =
> > @@ -539,19 +610,15 @@
> > encap_data =
> > ((const struct rte_flow_action_nvgre_encap
> > *)
> > action->conf)->definition;
> > - convert_result = flow_dv_convert_encap_data(encap_data,
> > buf,
> > - &size, error);
> > - if (convert_result)
> > - return NULL;
> > + if (flow_dv_convert_encap_data(encap_data, res.buf,
> > + &res.size, error))
> > + return -rte_errno;
> > }
> > - verbs_action = mlx5_glue-
> > >dv_create_flow_action_packet_reformat
> > - (priv->ctx, size, buf_ptr,
> > -
> > MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TO_L2_TUNNEL,
> > - MLX5DV_FLOW_TABLE_TYPE_NIC_TX);
> > - if (!verbs_action)
> > - rte_flow_error_set(error, EINVAL,
> > RTE_FLOW_ERROR_TYPE_ACTION,
> > - NULL, "cannot create L2 encap action");
> > - return verbs_action;
> > + if (flow_dv_encap_decap_resource_register(dev, &res, dev_flow,
> > error))
> > + return rte_flow_error_set(error, EINVAL,
> > + RTE_FLOW_ERROR_TYPE_ACTION,
> > + NULL, "can't create L2 encap
> > action");
> > + return 0;
> > }
> >
> > /**
> > @@ -559,27 +626,31 @@
> > *
> > * @param[in] dev
> > * Pointer to rte_eth_dev structure.
> > + * @param[in, out] dev_flow
> > + * Pointer to the mlx5_flow.
> > * @param[out] error
> > * Pointer to the error structure.
> > *
> > * @return
> > - * Pointer to action on success, NULL otherwise and rte_errno is set.
> > + * 0 on success, a negative errno value otherwise and rte_errno is set.
> > */
> > -static struct ibv_flow_action *
> > +static int
> > flow_dv_create_action_l2_decap(struct rte_eth_dev *dev,
> > + struct mlx5_flow *dev_flow,
> > struct rte_flow_error *error) {
> > - struct ibv_flow_action *verbs_action = NULL;
> > - struct priv *priv = dev->data->dev_private;
> > + struct mlx5_flow_dv_encap_decap_resource res = {
> > + .size = 0,
> > + .reformat_type =
> > +
> > MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TUNNEL_T
> > O_L2,
> > + .ft_type = MLX5DV_FLOW_TABLE_TYPE_NIC_RX,
> > + };
> >
> > - verbs_action = mlx5_glue-
> > >dv_create_flow_action_packet_reformat
> > - (priv->ctx, 0, NULL,
> > -
> > MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TUNNEL_TO_L2,
> > - MLX5DV_FLOW_TABLE_TYPE_NIC_RX);
> > - if (!verbs_action)
> > - rte_flow_error_set(error, EINVAL,
> > RTE_FLOW_ERROR_TYPE_ACTION,
> > - NULL, "cannot create L2 decap action");
> > - return verbs_action;
> > + if (flow_dv_encap_decap_resource_register(dev, &res, dev_flow,
> > error))
> > + return rte_flow_error_set(error, EINVAL,
> > + RTE_FLOW_ERROR_TYPE_ACTION,
> > + NULL, "can't create L2 decap
> > action");
> > + return 0;
> > }
> >
> > /**
> > @@ -589,41 +660,39 @@
> > * Pointer to rte_eth_dev structure.
> > * @param[in] action
> > * Pointer to action structure.
> > + * @param[in, out] dev_flow
> > + * Pointer to the mlx5_flow.
> > * @param[in] attr
> > * Pointer to the flow attributes.
> > * @param[out] error
> > * Pointer to the error structure.
> > *
> > * @return
> > - * Pointer to action on success, NULL otherwise and rte_errno is set.
> > + * 0 on success, a negative errno value otherwise and rte_errno is set.
> > */
> > -static struct ibv_flow_action *
> > +static int
> > flow_dv_create_action_raw_encap(struct rte_eth_dev *dev,
> > const struct rte_flow_action *action,
> > + struct mlx5_flow *dev_flow,
> > const struct rte_flow_attr *attr,
> > struct rte_flow_error *error)
> > {
> > - struct ibv_flow_action *verbs_action = NULL;
> > const struct rte_flow_action_raw_encap *encap_data;
> > - struct priv *priv = dev->data->dev_private;
> > - enum mlx5dv_flow_action_packet_reformat_type reformat_type;
> > - enum mlx5dv_flow_table_type ft_type;
> > + struct mlx5_flow_dv_encap_decap_resource res;
> >
> > encap_data = (const struct rte_flow_action_raw_encap *)action-
> > >conf;
> > - reformat_type = attr->egress ?
> > + res.size = encap_data->size;
> > + memcpy(res.buf, encap_data->data, res.size);
> > + res.reformat_type = attr->egress ?
> >
> > MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L2_TO_L3_TU
> > NNEL :
> >
> > MLX5DV_FLOW_ACTION_PACKET_REFORMAT_TYPE_L3_TUNNEL_T
> > O_L2;
> > - ft_type = attr->egress ?
> > - MLX5DV_FLOW_TABLE_TYPE_NIC_TX :
> > - MLX5DV_FLOW_TABLE_TYPE_NIC_RX;
> > - verbs_action = mlx5_glue-
> > >dv_create_flow_action_packet_reformat
> > - (priv->ctx, encap_data->size,
> > - (encap_data->size ? encap_data->data :
> > NULL),
> > - reformat_type, ft_type);
> > - if (!verbs_action)
> > - rte_flow_error_set(error, EINVAL,
> > RTE_FLOW_ERROR_TYPE_ACTION,
> > - NULL, "cannot create encap action");
> > - return verbs_action;
> > + res.ft_type = attr->egress ? MLX5DV_FLOW_TABLE_TYPE_NIC_TX :
> > + MLX5DV_FLOW_TABLE_TYPE_NIC_RX;
> > + if (flow_dv_encap_decap_resource_register(dev, &res, dev_flow,
> > error))
> > + return rte_flow_error_set(error, EINVAL,
> > + RTE_FLOW_ERROR_TYPE_ACTION,
> > + NULL, "can't create encap action");
> > + return 0;
> > }
> >
> > /**
> > @@ -1689,15 +1758,13 @@
> > break;
> > case RTE_FLOW_ACTION_TYPE_VXLAN_ENCAP:
> > case RTE_FLOW_ACTION_TYPE_NVGRE_ENCAP:
> > + if (flow_dv_create_action_l2_encap(dev, action,
> > + dev_flow, error))
> > + return -rte_errno;
> > dev_flow->dv.actions[actions_n].type =
> > MLX5DV_FLOW_ACTION_IBV_FLOW_ACTION;
> > dev_flow->dv.actions[actions_n].action =
> > - flow_dv_create_action_l2_encap(dev,
> > action,
> > - error);
> > - if (!(dev_flow->dv.actions[actions_n].action))
> > - return -rte_errno;
> > - dev_flow->dv.encap_decap_verbs_action =
> > - dev_flow->dv.actions[actions_n].action;
> > + dev_flow->dv.encap_decap->verbs_action;
> > flow->actions |= action->type ==
> > RTE_FLOW_ACTION_TYPE_VXLAN_ENCAP ?
> > MLX5_FLOW_ACTION_VXLAN_ENCAP :
> > @@ -1706,14 +1773,12 @@
> > break;
> > case RTE_FLOW_ACTION_TYPE_VXLAN_DECAP:
> > case RTE_FLOW_ACTION_TYPE_NVGRE_DECAP:
> > + if (flow_dv_create_action_l2_decap(dev, dev_flow, error))
> > + return -rte_errno;
> > dev_flow->dv.actions[actions_n].type =
> > MLX5DV_FLOW_ACTION_IBV_FLOW_ACTION;
> > dev_flow->dv.actions[actions_n].action =
> > - flow_dv_create_action_l2_decap(dev,
> > error);
> > - if (!(dev_flow->dv.actions[actions_n].action))
> > - return -rte_errno;
> > - dev_flow->dv.encap_decap_verbs_action =
> > - dev_flow->dv.actions[actions_n].action;
> > + dev_flow->dv.encap_decap->verbs_action;
> > flow->actions |= action->type ==
> > RTE_FLOW_ACTION_TYPE_VXLAN_DECAP ?
> > MLX5_FLOW_ACTION_VXLAN_DECAP :
> > @@ -1723,27 +1788,23 @@
> > case RTE_FLOW_ACTION_TYPE_RAW_ENCAP:
> > /* Handle encap action with preceding decap */
> > if (flow->actions & MLX5_FLOW_ACTION_RAW_DECAP) {
> > + if (flow_dv_create_action_raw_encap(dev, action,
> > + dev_flow,
> > + attr, error))
> > + return -rte_errno;
> > dev_flow->dv.actions[actions_n].type =
> >
> > MLX5DV_FLOW_ACTION_IBV_FLOW_ACTION;
> > dev_flow->dv.actions[actions_n].action =
> > - flow_dv_create_action_raw_encap
> > - (dev, action,
> > - attr, error);
> > - if (!(dev_flow->dv.actions[actions_n].action))
> > - return -rte_errno;
> > - dev_flow->dv.encap_decap_verbs_action =
> > - dev_flow->dv.actions[actions_n].action;
> > + dev_flow->dv.encap_decap-
> > >verbs_action;
> > } else {
> > /* Handle encap action without preceding decap */
> > + if (flow_dv_create_action_l2_encap(dev, action,
> > + dev_flow, error))
> > + return -rte_errno;
> > dev_flow->dv.actions[actions_n].type =
> >
> > MLX5DV_FLOW_ACTION_IBV_FLOW_ACTION;
> > dev_flow->dv.actions[actions_n].action =
> > - flow_dv_create_action_l2_encap
> > - (dev, action, error);
> > - if (!(dev_flow->dv.actions[actions_n].action))
> > - return -rte_errno;
> > - dev_flow->dv.encap_decap_verbs_action =
> > - dev_flow->dv.actions[actions_n].action;
> > + dev_flow->dv.encap_decap-
> > >verbs_action;
> > }
> > flow->actions |= MLX5_FLOW_ACTION_RAW_ENCAP;
> > actions_n++;
> > @@ -1756,15 +1817,13 @@
> > }
> > /* Handle decap action only if it isn't followed by encap */
> > if (action_ptr->type !=
> > RTE_FLOW_ACTION_TYPE_RAW_ENCAP) {
> > + if (flow_dv_create_action_l2_decap(dev, dev_flow,
> > + error))
> > + return -rte_errno;
> > dev_flow->dv.actions[actions_n].type =
> >
> > MLX5DV_FLOW_ACTION_IBV_FLOW_ACTION;
> > dev_flow->dv.actions[actions_n].action =
> > -
> > flow_dv_create_action_l2_decap(dev,
> > - error);
> > - if (!(dev_flow->dv.actions[actions_n].action))
> > - return -rte_errno;
> > - dev_flow->dv.encap_decap_verbs_action =
> > - dev_flow->dv.actions[actions_n].action;
> > + dev_flow->dv.encap_decap-
> > >verbs_action;
> > actions_n++;
> > }
> > /* If decap is followed by encap, handle it at encap case. */
> @@
> > -2074,6 +2133,37 @@ }
> >
> > /**
> > + * Release an encap/decap resource.
> > + *
> > + * @param flow
> > + * Pointer to mlx5_flow.
> > + *
> > + * @return
> > + * 1 while a reference on it exists, 0 when freed.
> > + */
> > +static int
> > +flow_dv_encap_decap_resource_release(struct mlx5_flow *flow) {
> > + struct mlx5_flow_dv_encap_decap_resource *cache_resource =
> > + flow->dv.encap_decap;
> > +
> > + assert(cache_resource->verbs_action);
> > + DRV_LOG(DEBUG, "encap/decap resource %p: refcnt %d--",
> > + (void *)cache_resource,
> > + rte_atomic32_read(&cache_resource->refcnt));
> > + if (rte_atomic32_dec_and_test(&cache_resource->refcnt)) {
> > + claim_zero(mlx5_glue->destroy_flow_action
> > + (cache_resource->verbs_action));
> > + LIST_REMOVE(cache_resource, next);
> > + rte_free(cache_resource);
> > + DRV_LOG(DEBUG, "encap/decap resource %p: removed",
> > + cache_resource);
> > + return 0;
> > + }
> > + return 1;
> > +}
> > +
> > +/**
> > * Remove the flow from the NIC but keeps it in memory.
> > *
> > * @param[in] dev
> > @@ -2128,11 +2218,8 @@
> > LIST_REMOVE(dev_flow, next);
> > if (dev_flow->dv.matcher)
> > flow_dv_matcher_release(dev, dev_flow);
> > - if (dev_flow->dv.encap_decap_verbs_action) {
> > - claim_zero(mlx5_glue->destroy_flow_action
> > - (dev_flow->dv.encap_decap_verbs_action));
> > - dev_flow->dv.encap_decap_verbs_action = NULL;
> > - }
> > + if (dev_flow->dv.encap_decap)
> > +
> > flow_dv_encap_decap_resource_release(dev_flow);
> > rte_free(dev_flow);
> > }
> > }
> > --
> > 1.8.3.1
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