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net/mlx5e: TC, Add sampler termination table API
Sampled packets are sent to software using termination tables. There is only one rule in that table that is to forward sampled packets to the e-switch management vport. Create a sampler termination table and rule for each eswitch. Signed-off-by: Chris Mi <cmi@nvidia.com> Reviewed-by: Oz Shlomo <ozsh@nvidia.com> Reviewed-by: Mark Bloch <mbloch@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
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Chris Mi
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Saeed Mahameed
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Apr 7, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB | ||
| /* Copyright (c) 2021 Mellanox Technologies. */ | ||
|
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| #include "esw/sample.h" | ||
| #include "eswitch.h" | ||
|
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| struct mlx5_esw_psample { | ||
| struct mlx5e_priv *priv; | ||
| struct mlx5_flow_table *termtbl; | ||
| struct mlx5_flow_handle *termtbl_rule; | ||
| }; | ||
|
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||
| static int | ||
| sampler_termtbl_create(struct mlx5_esw_psample *esw_psample) | ||
| { | ||
| struct mlx5_core_dev *dev = esw_psample->priv->mdev; | ||
| struct mlx5_eswitch *esw = dev->priv.eswitch; | ||
| struct mlx5_flow_table_attr ft_attr = {}; | ||
| struct mlx5_flow_destination dest = {}; | ||
| struct mlx5_flow_namespace *root_ns; | ||
| struct mlx5_flow_act act = {}; | ||
| int err; | ||
|
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| if (!MLX5_CAP_ESW_FLOWTABLE_FDB(dev, termination_table)) { | ||
| mlx5_core_warn(dev, "termination table is not supported\n"); | ||
| return -EOPNOTSUPP; | ||
| } | ||
|
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||
| root_ns = mlx5_get_flow_namespace(dev, MLX5_FLOW_NAMESPACE_FDB); | ||
| if (!root_ns) { | ||
| mlx5_core_warn(dev, "failed to get FDB flow namespace\n"); | ||
| return -EOPNOTSUPP; | ||
| } | ||
|
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||
| ft_attr.flags = MLX5_FLOW_TABLE_TERMINATION | MLX5_FLOW_TABLE_UNMANAGED; | ||
| ft_attr.autogroup.max_num_groups = 1; | ||
| ft_attr.prio = FDB_SLOW_PATH; | ||
| ft_attr.max_fte = 1; | ||
| ft_attr.level = 1; | ||
| esw_psample->termtbl = mlx5_create_auto_grouped_flow_table(root_ns, &ft_attr); | ||
| if (IS_ERR(esw_psample->termtbl)) { | ||
| err = PTR_ERR(esw_psample->termtbl); | ||
| mlx5_core_warn(dev, "failed to create termtbl, err: %d\n", err); | ||
| return err; | ||
| } | ||
|
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| act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST; | ||
| dest.vport.num = esw->manager_vport; | ||
| esw_psample->termtbl_rule = mlx5_add_flow_rules(esw_psample->termtbl, NULL, &act, &dest, 1); | ||
| if (IS_ERR(esw_psample->termtbl_rule)) { | ||
| err = PTR_ERR(esw_psample->termtbl_rule); | ||
| mlx5_core_warn(dev, "failed to create termtbl rule, err: %d\n", err); | ||
| mlx5_destroy_flow_table(esw_psample->termtbl); | ||
| return err; | ||
| } | ||
|
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||
| return 0; | ||
| } | ||
|
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||
| static void | ||
| sampler_termtbl_destroy(struct mlx5_esw_psample *esw_psample) | ||
| { | ||
| mlx5_del_flow_rules(esw_psample->termtbl_rule); | ||
| mlx5_destroy_flow_table(esw_psample->termtbl); | ||
| } | ||
|
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| struct mlx5_esw_psample * | ||
| mlx5_esw_sample_init(struct mlx5e_priv *priv) | ||
| { | ||
| struct mlx5_esw_psample *esw_psample; | ||
| int err; | ||
|
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| esw_psample = kzalloc(sizeof(*esw_psample), GFP_KERNEL); | ||
| if (!esw_psample) | ||
| return ERR_PTR(-ENOMEM); | ||
| esw_psample->priv = priv; | ||
| err = sampler_termtbl_create(esw_psample); | ||
| if (err) | ||
| goto err_termtbl; | ||
|
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| return esw_psample; | ||
|
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| err_termtbl: | ||
| kfree(esw_psample); | ||
| return ERR_PTR(err); | ||
| } | ||
|
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| void | ||
| mlx5_esw_sample_cleanup(struct mlx5_esw_psample *esw_psample) | ||
| { | ||
| if (IS_ERR_OR_NULL(esw_psample)) | ||
| return; | ||
|
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||
| sampler_termtbl_destroy(esw_psample); | ||
| kfree(esw_psample); | ||
| } |
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