1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 // Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
3
4 #include "en/tc_priv.h"
5 #include "en_tc.h"
6 #include "post_act.h"
7 #include "mlx5_core.h"
8 #include "fs_core.h"
9
10 struct mlx5e_post_act {
11 enum mlx5_flow_namespace_type ns_type;
12 struct mlx5_fs_chains *chains;
13 struct mlx5_flow_table *ft;
14 struct mlx5e_priv *priv;
15 struct xarray ids;
16 };
17
18 struct mlx5e_post_act_handle {
19 enum mlx5_flow_namespace_type ns_type;
20 struct mlx5_flow_attr *attr;
21 struct mlx5_flow_handle *rule;
22 u32 id;
23 };
24
25 #define MLX5_POST_ACTION_BITS MLX5_REG_MAPPING_MBITS(FTEID_TO_REG)
26 #define MLX5_POST_ACTION_MASK MLX5_REG_MAPPING_MASK(FTEID_TO_REG)
27 #define MLX5_POST_ACTION_MAX MLX5_POST_ACTION_MASK
28
29 struct mlx5e_post_act *
mlx5e_tc_post_act_init(struct mlx5e_priv * priv,struct mlx5_fs_chains * chains,enum mlx5_flow_namespace_type ns_type)30 mlx5e_tc_post_act_init(struct mlx5e_priv *priv, struct mlx5_fs_chains *chains,
31 enum mlx5_flow_namespace_type ns_type)
32 {
33 enum fs_flow_table_type table_type = ns_type == MLX5_FLOW_NAMESPACE_FDB ?
34 FS_FT_FDB : FS_FT_NIC_RX;
35 struct mlx5e_post_act *post_act;
36 int err;
37
38 if (!MLX5_CAP_FLOWTABLE_TYPE(priv->mdev, ignore_flow_level, table_type)) {
39 if (priv->mdev->coredev_type == MLX5_COREDEV_PF)
40 mlx5_core_warn(priv->mdev, "firmware level support is missing\n");
41 err = -EOPNOTSUPP;
42 goto err_check;
43 }
44
45 post_act = kzalloc(sizeof(*post_act), GFP_KERNEL);
46 if (!post_act) {
47 err = -ENOMEM;
48 goto err_check;
49 }
50 post_act->ft = mlx5_chains_create_global_table(chains);
51 if (IS_ERR(post_act->ft)) {
52 err = PTR_ERR(post_act->ft);
53 mlx5_core_warn(priv->mdev, "failed to create post action table, err: %d\n", err);
54 goto err_ft;
55 }
56 post_act->chains = chains;
57 post_act->ns_type = ns_type;
58 post_act->priv = priv;
59 xa_init_flags(&post_act->ids, XA_FLAGS_ALLOC1);
60 return post_act;
61
62 err_ft:
63 kfree(post_act);
64 err_check:
65 return ERR_PTR(err);
66 }
67
68 void
mlx5e_tc_post_act_destroy(struct mlx5e_post_act * post_act)69 mlx5e_tc_post_act_destroy(struct mlx5e_post_act *post_act)
70 {
71 if (IS_ERR_OR_NULL(post_act))
72 return;
73
74 xa_destroy(&post_act->ids);
75 mlx5_chains_destroy_global_table(post_act->chains, post_act->ft);
76 kfree(post_act);
77 }
78
79 int
mlx5e_tc_post_act_offload(struct mlx5e_post_act * post_act,struct mlx5e_post_act_handle * handle)80 mlx5e_tc_post_act_offload(struct mlx5e_post_act *post_act,
81 struct mlx5e_post_act_handle *handle)
82 {
83 struct mlx5_flow_spec *spec;
84 int err;
85
86 spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
87 if (!spec)
88 return -ENOMEM;
89
90 /* Post action rule matches on fte_id and executes original rule's tc rule action */
91 mlx5e_tc_match_to_reg_match(spec, FTEID_TO_REG, handle->id, MLX5_POST_ACTION_MASK);
92
93 handle->rule = mlx5e_tc_rule_offload(post_act->priv, spec, handle->attr);
94 if (IS_ERR(handle->rule)) {
95 err = PTR_ERR(handle->rule);
96 netdev_warn(post_act->priv->netdev, "Failed to add post action rule");
97 goto err_rule;
98 }
99
100 kvfree(spec);
101 return 0;
102
103 err_rule:
104 kvfree(spec);
105 return err;
106 }
107
108 struct mlx5e_post_act_handle *
mlx5e_tc_post_act_add(struct mlx5e_post_act * post_act,struct mlx5_flow_attr * attr)109 mlx5e_tc_post_act_add(struct mlx5e_post_act *post_act, struct mlx5_flow_attr *attr)
110 {
111 u32 attr_sz = ns_to_attr_sz(post_act->ns_type);
112 struct mlx5e_post_act_handle *handle;
113 struct mlx5_flow_attr *post_attr;
114 int err;
115
116 handle = kzalloc(sizeof(*handle), GFP_KERNEL);
117 post_attr = mlx5_alloc_flow_attr(post_act->ns_type);
118 if (!handle || !post_attr) {
119 kfree(post_attr);
120 kfree(handle);
121 return ERR_PTR(-ENOMEM);
122 }
123
124 memcpy(post_attr, attr, attr_sz);
125 post_attr->chain = 0;
126 post_attr->prio = 0;
127 post_attr->ft = post_act->ft;
128 post_attr->inner_match_level = MLX5_MATCH_NONE;
129 post_attr->outer_match_level = MLX5_MATCH_NONE;
130 post_attr->action &= ~MLX5_FLOW_CONTEXT_ACTION_DECAP;
131 post_attr->flags |= MLX5_ATTR_FLAG_NO_IN_PORT;
132
133 handle->ns_type = post_act->ns_type;
134 /* Splits were handled before post action */
135 if (handle->ns_type == MLX5_FLOW_NAMESPACE_FDB)
136 post_attr->esw_attr->split_count = 0;
137
138 err = xa_alloc(&post_act->ids, &handle->id, post_attr,
139 XA_LIMIT(1, MLX5_POST_ACTION_MAX), GFP_KERNEL);
140 if (err)
141 goto err_xarray;
142
143 handle->attr = post_attr;
144
145 return handle;
146
147 err_xarray:
148 kfree(post_attr);
149 kfree(handle);
150 return ERR_PTR(err);
151 }
152
153 void
mlx5e_tc_post_act_unoffload(struct mlx5e_post_act * post_act,struct mlx5e_post_act_handle * handle)154 mlx5e_tc_post_act_unoffload(struct mlx5e_post_act *post_act,
155 struct mlx5e_post_act_handle *handle)
156 {
157 mlx5e_tc_rule_unoffload(post_act->priv, handle->rule, handle->attr);
158 handle->rule = NULL;
159 }
160
161 void
mlx5e_tc_post_act_del(struct mlx5e_post_act * post_act,struct mlx5e_post_act_handle * handle)162 mlx5e_tc_post_act_del(struct mlx5e_post_act *post_act, struct mlx5e_post_act_handle *handle)
163 {
164 if (!IS_ERR_OR_NULL(handle->rule))
165 mlx5e_tc_post_act_unoffload(post_act, handle);
166 xa_erase(&post_act->ids, handle->id);
167 kfree(handle->attr);
168 kfree(handle);
169 }
170
171 struct mlx5_flow_table *
mlx5e_tc_post_act_get_ft(struct mlx5e_post_act * post_act)172 mlx5e_tc_post_act_get_ft(struct mlx5e_post_act *post_act)
173 {
174 return post_act->ft;
175 }
176
177 /* Allocate a header modify action to write the post action handle fte id to a register. */
178 int
mlx5e_tc_post_act_set_handle(struct mlx5_core_dev * dev,struct mlx5e_post_act_handle * handle,struct mlx5e_tc_mod_hdr_acts * acts)179 mlx5e_tc_post_act_set_handle(struct mlx5_core_dev *dev,
180 struct mlx5e_post_act_handle *handle,
181 struct mlx5e_tc_mod_hdr_acts *acts)
182 {
183 return mlx5e_tc_match_to_reg_set(dev, acts, handle->ns_type, FTEID_TO_REG, handle->id);
184 }
185