1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB 2 // Copyright (c) 2019 Mellanox Technologies. 3 4 #include <linux/mlx5/fs.h> 5 #include "eswitch.h" 6 #include "en_tc.h" 7 #include "fs_core.h" 8 9 struct mlx5_termtbl_handle { 10 struct hlist_node termtbl_hlist; 11 12 struct mlx5_flow_table *termtbl; 13 struct mlx5_flow_act flow_act; 14 struct mlx5_flow_destination dest; 15 16 struct mlx5_flow_handle *rule; 17 int ref_count; 18 }; 19 20 static u32 21 mlx5_eswitch_termtbl_hash(struct mlx5_flow_act *flow_act, 22 struct mlx5_flow_destination *dest) 23 { 24 u32 hash; 25 26 hash = jhash_1word(flow_act->action, 0); 27 hash = jhash((const void *)&flow_act->vlan, 28 sizeof(flow_act->vlan), hash); 29 hash = jhash((const void *)&dest->vport.num, 30 sizeof(dest->vport.num), hash); 31 hash = jhash((const void *)&dest->vport.vhca_id, 32 sizeof(dest->vport.num), hash); 33 if (dest->vport.pkt_reformat) 34 hash = jhash(dest->vport.pkt_reformat, 35 sizeof(*dest->vport.pkt_reformat), 36 hash); 37 return hash; 38 } 39 40 static int 41 mlx5_eswitch_termtbl_cmp(struct mlx5_flow_act *flow_act1, 42 struct mlx5_flow_destination *dest1, 43 struct mlx5_flow_act *flow_act2, 44 struct mlx5_flow_destination *dest2) 45 { 46 int ret; 47 48 ret = flow_act1->action != flow_act2->action || 49 dest1->vport.num != dest2->vport.num || 50 dest1->vport.vhca_id != dest2->vport.vhca_id || 51 memcmp(&flow_act1->vlan, &flow_act2->vlan, 52 sizeof(flow_act1->vlan)); 53 if (ret) 54 return ret; 55 56 return dest1->vport.pkt_reformat && dest2->vport.pkt_reformat ? 57 memcmp(dest1->vport.pkt_reformat, dest2->vport.pkt_reformat, 58 sizeof(*dest1->vport.pkt_reformat)) : 0; 59 } 60 61 static int 62 mlx5_eswitch_termtbl_create(struct mlx5_core_dev *dev, 63 struct mlx5_termtbl_handle *tt, 64 struct mlx5_flow_act *flow_act) 65 { 66 struct mlx5_flow_table_attr ft_attr = {}; 67 struct mlx5_flow_namespace *root_ns; 68 int err; 69 70 root_ns = mlx5_get_flow_namespace(dev, MLX5_FLOW_NAMESPACE_FDB); 71 if (!root_ns) { 72 esw_warn(dev, "Failed to get FDB flow namespace\n"); 73 return -EOPNOTSUPP; 74 } 75 76 /* As this is the terminating action then the termination table is the 77 * same prio as the slow path 78 */ 79 ft_attr.flags = MLX5_FLOW_TABLE_TERMINATION | 80 MLX5_FLOW_TABLE_TUNNEL_EN_REFORMAT; 81 ft_attr.prio = FDB_SLOW_PATH; 82 ft_attr.max_fte = 1; 83 ft_attr.autogroup.max_num_groups = 1; 84 tt->termtbl = mlx5_create_auto_grouped_flow_table(root_ns, &ft_attr); 85 if (IS_ERR(tt->termtbl)) { 86 esw_warn(dev, "Failed to create termination table\n"); 87 return -EOPNOTSUPP; 88 } 89 90 tt->rule = mlx5_add_flow_rules(tt->termtbl, NULL, flow_act, 91 &tt->dest, 1); 92 if (IS_ERR(tt->rule)) { 93 esw_warn(dev, "Failed to create termination table rule\n"); 94 goto add_flow_err; 95 } 96 return 0; 97 98 add_flow_err: 99 err = mlx5_destroy_flow_table(tt->termtbl); 100 if (err) 101 esw_warn(dev, "Failed to destroy termination table\n"); 102 103 return -EOPNOTSUPP; 104 } 105 106 static struct mlx5_termtbl_handle * 107 mlx5_eswitch_termtbl_get_create(struct mlx5_eswitch *esw, 108 struct mlx5_flow_act *flow_act, 109 struct mlx5_flow_destination *dest, 110 struct mlx5_esw_flow_attr *attr) 111 { 112 struct mlx5_termtbl_handle *tt; 113 bool found = false; 114 u32 hash_key; 115 int err; 116 117 mutex_lock(&esw->offloads.termtbl_mutex); 118 hash_key = mlx5_eswitch_termtbl_hash(flow_act, dest); 119 hash_for_each_possible(esw->offloads.termtbl_tbl, tt, 120 termtbl_hlist, hash_key) { 121 if (!mlx5_eswitch_termtbl_cmp(&tt->flow_act, &tt->dest, 122 flow_act, dest)) { 123 found = true; 124 break; 125 } 126 } 127 if (found) 128 goto tt_add_ref; 129 130 tt = kzalloc(sizeof(*tt), GFP_KERNEL); 131 if (!tt) { 132 err = -ENOMEM; 133 goto tt_create_err; 134 } 135 136 tt->dest.type = MLX5_FLOW_DESTINATION_TYPE_VPORT; 137 tt->dest.vport.num = dest->vport.num; 138 tt->dest.vport.vhca_id = dest->vport.vhca_id; 139 tt->dest.vport.flags = dest->vport.flags; 140 memcpy(&tt->flow_act, flow_act, sizeof(*flow_act)); 141 142 err = mlx5_eswitch_termtbl_create(esw->dev, tt, flow_act); 143 if (err) { 144 esw_warn(esw->dev, "Failed to create termination table\n"); 145 goto tt_create_err; 146 } 147 hash_add(esw->offloads.termtbl_tbl, &tt->termtbl_hlist, hash_key); 148 tt_add_ref: 149 tt->ref_count++; 150 mutex_unlock(&esw->offloads.termtbl_mutex); 151 return tt; 152 tt_create_err: 153 kfree(tt); 154 mutex_unlock(&esw->offloads.termtbl_mutex); 155 return ERR_PTR(err); 156 } 157 158 void 159 mlx5_eswitch_termtbl_put(struct mlx5_eswitch *esw, 160 struct mlx5_termtbl_handle *tt) 161 { 162 mutex_lock(&esw->offloads.termtbl_mutex); 163 if (--tt->ref_count == 0) 164 hash_del(&tt->termtbl_hlist); 165 mutex_unlock(&esw->offloads.termtbl_mutex); 166 167 if (!tt->ref_count) { 168 mlx5_del_flow_rules(tt->rule); 169 mlx5_destroy_flow_table(tt->termtbl); 170 kfree(tt); 171 } 172 } 173 174 static bool mlx5_eswitch_termtbl_is_encap_reformat(struct mlx5_pkt_reformat *rt) 175 { 176 switch (rt->reformat_type) { 177 case MLX5_REFORMAT_TYPE_L2_TO_VXLAN: 178 case MLX5_REFORMAT_TYPE_L2_TO_NVGRE: 179 case MLX5_REFORMAT_TYPE_L2_TO_L2_TUNNEL: 180 case MLX5_REFORMAT_TYPE_L2_TO_L3_TUNNEL: 181 return true; 182 default: 183 return false; 184 } 185 } 186 187 static void 188 mlx5_eswitch_termtbl_actions_move(struct mlx5_flow_act *src, 189 struct mlx5_flow_act *dst) 190 { 191 if (src->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH) { 192 src->action &= ~MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH; 193 dst->action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH; 194 memcpy(&dst->vlan[0], &src->vlan[0], sizeof(src->vlan[0])); 195 memset(&src->vlan[0], 0, sizeof(src->vlan[0])); 196 197 if (src->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2) { 198 src->action &= ~MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2; 199 dst->action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2; 200 memcpy(&dst->vlan[1], &src->vlan[1], sizeof(src->vlan[1])); 201 memset(&src->vlan[1], 0, sizeof(src->vlan[1])); 202 } 203 } 204 205 if (src->action & MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT && 206 mlx5_eswitch_termtbl_is_encap_reformat(src->pkt_reformat)) { 207 src->action &= ~MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT; 208 dst->action |= MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT; 209 dst->pkt_reformat = src->pkt_reformat; 210 src->pkt_reformat = NULL; 211 } 212 } 213 214 static bool mlx5_eswitch_offload_is_uplink_port(const struct mlx5_eswitch *esw, 215 const struct mlx5_flow_spec *spec) 216 { 217 u16 port_mask, port_value; 218 219 if (MLX5_CAP_ESW_FLOWTABLE(esw->dev, flow_source)) 220 return spec->flow_context.flow_source == 221 MLX5_FLOW_CONTEXT_FLOW_SOURCE_UPLINK; 222 223 port_mask = MLX5_GET(fte_match_param, spec->match_criteria, 224 misc_parameters.source_port); 225 port_value = MLX5_GET(fte_match_param, spec->match_value, 226 misc_parameters.source_port); 227 return (port_mask & port_value) == MLX5_VPORT_UPLINK; 228 } 229 230 bool 231 mlx5_eswitch_termtbl_required(struct mlx5_eswitch *esw, 232 struct mlx5_flow_attr *attr, 233 struct mlx5_flow_act *flow_act, 234 struct mlx5_flow_spec *spec) 235 { 236 struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr; 237 int i; 238 239 if (!MLX5_CAP_ESW_FLOWTABLE_FDB(esw->dev, termination_table) || 240 attr->flags & MLX5_ESW_ATTR_FLAG_SLOW_PATH || 241 !mlx5_eswitch_offload_is_uplink_port(esw, spec)) 242 return false; 243 244 /* push vlan on RX */ 245 if (flow_act->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH) 246 return true; 247 248 /* hairpin */ 249 for (i = esw_attr->split_count; i < esw_attr->out_count; i++) 250 if (esw_attr->dests[i].rep->vport == MLX5_VPORT_UPLINK) 251 return true; 252 253 return false; 254 } 255 256 struct mlx5_flow_handle * 257 mlx5_eswitch_add_termtbl_rule(struct mlx5_eswitch *esw, 258 struct mlx5_flow_table *fdb, 259 struct mlx5_flow_spec *spec, 260 struct mlx5_esw_flow_attr *attr, 261 struct mlx5_flow_act *flow_act, 262 struct mlx5_flow_destination *dest, 263 int num_dest) 264 { 265 struct mlx5_flow_act term_tbl_act = {}; 266 struct mlx5_flow_handle *rule = NULL; 267 bool term_table_created = false; 268 int num_vport_dests = 0; 269 int i, curr_dest; 270 271 mlx5_eswitch_termtbl_actions_move(flow_act, &term_tbl_act); 272 term_tbl_act.action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST; 273 274 for (i = 0; i < num_dest; i++) { 275 struct mlx5_termtbl_handle *tt; 276 277 /* only vport destinations can be terminated */ 278 if (dest[i].type != MLX5_FLOW_DESTINATION_TYPE_VPORT) 279 continue; 280 281 /* get the terminating table for the action list */ 282 tt = mlx5_eswitch_termtbl_get_create(esw, &term_tbl_act, 283 &dest[i], attr); 284 if (IS_ERR(tt)) { 285 esw_warn(esw->dev, "Failed to create termination table\n"); 286 goto revert_changes; 287 } 288 attr->dests[num_vport_dests].termtbl = tt; 289 num_vport_dests++; 290 291 /* link the destination with the termination table */ 292 dest[i].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE; 293 dest[i].ft = tt->termtbl; 294 term_table_created = true; 295 } 296 297 /* at least one destination should reference a termination table */ 298 if (!term_table_created) 299 goto revert_changes; 300 301 /* create the FTE */ 302 rule = mlx5_add_flow_rules(fdb, spec, flow_act, dest, num_dest); 303 if (IS_ERR(rule)) 304 goto revert_changes; 305 306 goto out; 307 308 revert_changes: 309 /* revert the changes that were made to the original flow_act 310 * and fall-back to the original rule actions 311 */ 312 mlx5_eswitch_termtbl_actions_move(&term_tbl_act, flow_act); 313 314 for (curr_dest = 0; curr_dest < num_vport_dests; curr_dest++) { 315 struct mlx5_termtbl_handle *tt = attr->dests[curr_dest].termtbl; 316 317 /* search for the destination associated with the 318 * current term table 319 */ 320 for (i = 0; i < num_dest; i++) { 321 if (dest[i].ft != tt->termtbl) 322 continue; 323 324 memset(&dest[i], 0, sizeof(dest[i])); 325 dest[i].type = MLX5_FLOW_DESTINATION_TYPE_VPORT; 326 dest[i].vport.num = tt->dest.vport.num; 327 dest[i].vport.vhca_id = tt->dest.vport.vhca_id; 328 mlx5_eswitch_termtbl_put(esw, tt); 329 break; 330 } 331 } 332 rule = mlx5_add_flow_rules(fdb, spec, flow_act, dest, num_dest); 333 out: 334 return rule; 335 } 336