drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c

   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, err2;
  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 | MLX5_FLOW_TABLE_UNMANAGED |
  80                         MLX5_FLOW_TABLE_TUNNEL_EN_REFORMAT;
  81         ft_attr.prio = FDB_TC_OFFLOAD;
  82         ft_attr.max_fte = 1;
  83         ft_attr.level = 1;
  84         ft_attr.autogroup.max_num_groups = 1;
  85         tt->termtbl = mlx5_create_auto_grouped_flow_table(root_ns, &ft_attr);
  86         if (IS_ERR(tt->termtbl)) {
  87                 err = PTR_ERR(tt->termtbl);
  88                 esw_warn(dev, "Failed to create termination table, err %pe\n", tt->termtbl);
  89                 return err;
  90         }
  91
  92         tt->rule = mlx5_add_flow_rules(tt->termtbl, NULL, flow_act,
  93                                        &tt->dest, 1);
  94         if (IS_ERR(tt->rule)) {
  95                 err = PTR_ERR(tt->rule);
  96                 esw_warn(dev, "Failed to create termination table rule, err %pe\n", tt->rule);
  97                 goto add_flow_err;
  98         }
  99         return 0;
 100
 101 add_flow_err:
 102         err2 = mlx5_destroy_flow_table(tt->termtbl);
 103         if (err2)
 104                 esw_warn(dev, "Failed to destroy termination table, err %d\n", err2);
 105
 106         return err;
 107 }
 108
 109 static struct mlx5_termtbl_handle *
 110 mlx5_eswitch_termtbl_get_create(struct mlx5_eswitch *esw,
 111                                 struct mlx5_flow_act *flow_act,
 112                                 struct mlx5_flow_destination *dest,
 113                                 struct mlx5_esw_flow_attr *attr)
 114 {
 115         struct mlx5_termtbl_handle *tt;
 116         bool found = false;
 117         u32 hash_key;
 118         int err;
 119
 120         mutex_lock(&esw->offloads.termtbl_mutex);
 121         hash_key = mlx5_eswitch_termtbl_hash(flow_act, dest);
 122         hash_for_each_possible(esw->offloads.termtbl_tbl, tt,
 123                                termtbl_hlist, hash_key) {
 124                 if (!mlx5_eswitch_termtbl_cmp(&tt->flow_act, &tt->dest,
 125                                               flow_act, dest)) {
 126                         found = true;
 127                         break;
 128                 }
 129         }
 130         if (found)
 131                 goto tt_add_ref;
 132
 133         tt = kzalloc(sizeof(*tt), GFP_KERNEL);
 134         if (!tt) {
 135                 err = -ENOMEM;
 136                 goto tt_create_err;
 137         }
 138
 139         tt->dest.type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
 140         tt->dest.vport.num = dest->vport.num;
 141         tt->dest.vport.vhca_id = dest->vport.vhca_id;
 142         tt->dest.vport.flags = dest->vport.flags;
 143         memcpy(&tt->flow_act, flow_act, sizeof(*flow_act));
 144
 145         err = mlx5_eswitch_termtbl_create(esw->dev, tt, flow_act);
 146         if (err)
 147                 goto tt_create_err;
 148
 149         hash_add(esw->offloads.termtbl_tbl, &tt->termtbl_hlist, hash_key);
 150 tt_add_ref:
 151         tt->ref_count++;
 152         mutex_unlock(&esw->offloads.termtbl_mutex);
 153         return tt;
 154 tt_create_err:
 155         kfree(tt);
 156         mutex_unlock(&esw->offloads.termtbl_mutex);
 157         return ERR_PTR(err);
 158 }
 159
 160 void
 161 mlx5_eswitch_termtbl_put(struct mlx5_eswitch *esw,
 162                          struct mlx5_termtbl_handle *tt)
 163 {
 164         mutex_lock(&esw->offloads.termtbl_mutex);
 165         if (--tt->ref_count == 0)
 166                 hash_del(&tt->termtbl_hlist);
 167         mutex_unlock(&esw->offloads.termtbl_mutex);
 168
 169         if (!tt->ref_count) {
 170                 mlx5_del_flow_rules(tt->rule);
 171                 mlx5_destroy_flow_table(tt->termtbl);
 172                 kfree(tt);
 173         }
 174 }
 175
 176 static void
 177 mlx5_eswitch_termtbl_actions_move(struct mlx5_flow_act *src,
 178                                   struct mlx5_flow_act *dst)
 179 {
 180         if (src->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH) {
 181                 src->action &= ~MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH;
 182                 dst->action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH;
 183                 memcpy(&dst->vlan[0], &src->vlan[0], sizeof(src->vlan[0]));
 184                 memset(&src->vlan[0], 0, sizeof(src->vlan[0]));
 185
 186                 if (src->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2) {
 187                         src->action &= ~MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2;
 188                         dst->action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2;
 189                         memcpy(&dst->vlan[1], &src->vlan[1], sizeof(src->vlan[1]));
 190                         memset(&src->vlan[1], 0, sizeof(src->vlan[1]));
 191                 }
 192         }
 193 }
 194
 195 static bool mlx5_eswitch_offload_is_uplink_port(const struct mlx5_eswitch *esw,
 196                                                 const struct mlx5_flow_spec *spec)
 197 {
 198         u16 port_mask, port_value;
 199
 200         if (MLX5_CAP_ESW_FLOWTABLE(esw->dev, flow_source))
 201                 return spec->flow_context.flow_source ==
 202                                         MLX5_FLOW_CONTEXT_FLOW_SOURCE_UPLINK;
 203
 204         port_mask = MLX5_GET(fte_match_param, spec->match_criteria,
 205                              misc_parameters.source_port);
 206         port_value = MLX5_GET(fte_match_param, spec->match_value,
 207                               misc_parameters.source_port);
 208         return (port_mask & port_value) == MLX5_VPORT_UPLINK;
 209 }
 210
 211 bool
 212 mlx5_eswitch_termtbl_required(struct mlx5_eswitch *esw,
 213                               struct mlx5_flow_attr *attr,
 214                               struct mlx5_flow_act *flow_act,
 215                               struct mlx5_flow_spec *spec)
 216 {
 217         struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
 218         int i;
 219
 220         if (!MLX5_CAP_ESW_FLOWTABLE_FDB(esw->dev, termination_table) ||
 221             !MLX5_CAP_ESW_FLOWTABLE_FDB(esw->dev, ignore_flow_level) ||
 222             mlx5_esw_attr_flags_skip(attr->flags) ||
 223             !mlx5_eswitch_offload_is_uplink_port(esw, spec))
 224                 return false;
 225
 226         /* push vlan on RX */
 227         if (flow_act->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH)
 228                 return true;
 229
 230         /* hairpin */
 231         for (i = esw_attr->split_count; i < esw_attr->out_count; i++)
 232                 if (esw_attr->dests[i].rep->vport == MLX5_VPORT_UPLINK)
 233                         return true;
 234
 235         return false;
 236 }
 237
 238 struct mlx5_flow_handle *
 239 mlx5_eswitch_add_termtbl_rule(struct mlx5_eswitch *esw,
 240                               struct mlx5_flow_table *fdb,
 241                               struct mlx5_flow_spec *spec,
 242                               struct mlx5_esw_flow_attr *attr,
 243                               struct mlx5_flow_act *flow_act,
 244                               struct mlx5_flow_destination *dest,
 245                               int num_dest)
 246 {
 247         struct mlx5_flow_act term_tbl_act = {};
 248         struct mlx5_flow_handle *rule = NULL;
 249         bool term_table_created = false;
 250         int num_vport_dests = 0;
 251         int i, curr_dest;
 252
 253         mlx5_eswitch_termtbl_actions_move(flow_act, &term_tbl_act);
 254         term_tbl_act.action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
 255
 256         for (i = 0; i < num_dest; i++) {
 257                 struct mlx5_termtbl_handle *tt;
 258
 259                 /* only vport destinations can be terminated */
 260                 if (dest[i].type != MLX5_FLOW_DESTINATION_TYPE_VPORT)
 261                         continue;
 262
 263                 if (attr->dests[num_vport_dests].flags & MLX5_ESW_DEST_ENCAP) {
 264                         term_tbl_act.action |= MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
 265                         term_tbl_act.pkt_reformat = attr->dests[num_vport_dests].pkt_reformat;
 266                 } else {
 267                         term_tbl_act.action &= ~MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
 268                         term_tbl_act.pkt_reformat = NULL;
 269                 }
 270
 271                 /* get the terminating table for the action list */
 272                 tt = mlx5_eswitch_termtbl_get_create(esw, &term_tbl_act,
 273                                                      &dest[i], attr);
 274                 if (IS_ERR(tt)) {
 275                         esw_warn(esw->dev, "Failed to get termination table, err %pe\n", tt);
 276                         goto revert_changes;
 277                 }
 278                 attr->dests[num_vport_dests].termtbl = tt;
 279                 num_vport_dests++;
 280
 281                 /* link the destination with the termination table */
 282                 dest[i].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
 283                 dest[i].ft = tt->termtbl;
 284                 term_table_created = true;
 285         }
 286
 287         /* at least one destination should reference a termination table */
 288         if (!term_table_created)
 289                 goto revert_changes;
 290
 291         /* create the FTE */
 292         flow_act->action &= ~MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
 293         flow_act->pkt_reformat = NULL;
 294         flow_act->flags |= FLOW_ACT_IGNORE_FLOW_LEVEL;
 295         rule = mlx5_add_flow_rules(fdb, spec, flow_act, dest, num_dest);
 296         if (IS_ERR(rule))
 297                 goto revert_changes;
 298
 299         goto out;
 300
 301 revert_changes:
 302         /* revert the changes that were made to the original flow_act
 303          * and fall-back to the original rule actions
 304          */
 305         mlx5_eswitch_termtbl_actions_move(&term_tbl_act, flow_act);
 306
 307         for (curr_dest = 0; curr_dest < num_vport_dests; curr_dest++) {
 308                 struct mlx5_termtbl_handle *tt = attr->dests[curr_dest].termtbl;
 309
 310                 /* search for the destination associated with the
 311                  * current term table
 312                  */
 313                 for (i = 0; i < num_dest; i++) {
 314                         if (dest[i].ft != tt->termtbl)
 315                                 continue;
 316
 317                         memset(&dest[i], 0, sizeof(dest[i]));
 318                         dest[i].type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
 319                         dest[i].vport.num = tt->dest.vport.num;
 320                         dest[i].vport.vhca_id = tt->dest.vport.vhca_id;
 321                         mlx5_eswitch_termtbl_put(esw, tt);
 322                         break;
 323                 }
 324         }
 325         rule = mlx5_add_flow_rules(fdb, spec, flow_act, dest, num_dest);
 326 out:
 327         return rule;
 328 }