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;
  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 }