// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
// Copyright (c) 2019 Mellanox Technologies.
#include <linux/mlx5/fs.h>
#include "eswitch.h"
struct mlx5_termtbl_handle {
struct hlist_node termtbl_hlist;
struct mlx5_flow_table *termtbl;
struct mlx5_flow_act flow_act;
struct mlx5_flow_destination dest;
struct mlx5_flow_handle *rule;
int ref_count;
};
static u32
mlx5_eswitch_termtbl_hash(struct mlx5_flow_act *flow_act,
struct mlx5_flow_destination *dest)
{
u32 hash;
hash = jhash_1word(flow_act->action, 0);
hash = jhash((const void *)&flow_act->vlan,
sizeof(flow_act->vlan), hash);
hash = jhash((const void *)&dest->vport.num,
sizeof(dest->vport.num), hash);
hash = jhash((const void *)&dest->vport.vhca_id,
sizeof(dest->vport.num), hash);
return hash;
}
static int
mlx5_eswitch_termtbl_cmp(struct mlx5_flow_act *flow_act1,
struct mlx5_flow_destination *dest1,
struct mlx5_flow_act *flow_act2,
struct mlx5_flow_destination *dest2)
{
return flow_act1->action != flow_act2->action ||
dest1->vport.num != dest2->vport.num ||
dest1->vport.vhca_id != dest2->vport.vhca_id ||
memcmp(&flow_act1->vlan, &flow_act2->vlan,
sizeof(flow_act1->vlan));
}
static int
mlx5_eswitch_termtbl_create(struct mlx5_core_dev *dev,
struct mlx5_termtbl_handle *tt,
struct mlx5_flow_act *flow_act)
{
static const struct mlx5_flow_spec spec = {};
struct mlx5_flow_namespace *root_ns;
int prio, flags;
int err;
root_ns = mlx5_get_flow_namespace(dev, MLX5_FLOW_NAMESPACE_FDB);
if (!root_ns) {
esw_warn(dev, "Failed to get FDB flow namespace\n");
return -EOPNOTSUPP;
}
/* As this is the terminating action then the termination table is the
* same prio as the slow path
*/
prio = FDB_SLOW_PATH;
flags = MLX5_FLOW_TABLE_TERMINATION;
tt->termtbl = mlx5_create_auto_grouped_flow_table(root_ns, prio, 1, 1,
0, flags);
if (IS_ERR(tt->termtbl)) {
esw_warn(dev, "Failed to create termination table\n");
return -EOPNOTSUPP;
}
tt->rule = mlx5_add_flow_rules(tt->termtbl, &spec, flow_act,
&tt->dest, 1);
if (IS_ERR(tt->rule)) {
esw_warn(dev, "Failed to create termination table rule\n");
goto add_flow_err;
}
return 0;
add_flow_err:
err = mlx5_destroy_flow_table(tt->termtbl);
if (err)
esw_warn(dev, "Failed to destroy termination table\n");
return -EOPNOTSUPP;
}
static struct mlx5_termtbl_handle *
mlx5_eswitch_termtbl_get_create(struct mlx5_eswitch *esw,
struct mlx5_flow_act *flow_act,
struct mlx5_flow_destination *dest)
{
struct mlx5_termtbl_handle *tt;
bool found = false;
u32 hash_key;
int err;
mutex_lock(&esw->offloads.termtbl_mutex);
hash_key = mlx5_eswitch_termtbl_hash(flow_act, dest);
hash_for_each_possible(esw->offloads.termtbl_tbl, tt,
termtbl_hlist, hash_key) {
if (!mlx5_eswitch_termtbl_cmp(&tt->flow_act, &tt->dest,
flow_act, dest)) {
found = true;
break;
}
}
if (found)
goto tt_add_ref;
tt = kzalloc(sizeof(*tt), GFP_KERNEL);
if (!tt) {
err = -ENOMEM;
goto tt_create_err;
}
tt->dest.type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
tt->dest.vport.num = dest->vport.num;
tt->dest.vport.vhca_id = dest->vport.vhca_id;
memcpy(&tt->flow_act, flow_act, sizeof(*flow_act));
err = mlx5_eswitch_termtbl_create(esw->dev, tt, flow_act);
if (err) {
esw_warn(esw->dev, "Failed to create termination table\n");
goto tt_create_err;
}
hash_add(esw->offloads.termtbl_tbl, &tt->termtbl_hlist, hash_key);
tt_add_ref:
tt->ref_count++;
mutex_unlock(&esw->offloads.termtbl_mutex);
return tt;
tt_create_err:
kfree(tt);
mutex_unlock(&esw->offloads.termtbl_mutex);
return ERR_PTR(err);
}
void
mlx5_eswitch_termtbl_put(struct mlx5_eswitch *esw,
struct mlx5_termtbl_handle *tt)
{
mutex_lock(&esw->offloads.termtbl_mutex);
if (--tt->ref_count == 0)
hash_del(&tt->termtbl_hlist);
mutex_unlock(&esw->offloads.termtbl_mutex);
if (!tt->ref_count) {
mlx5_del_flow_rules(tt->rule);
mlx5_destroy_flow_table(tt->termtbl);
kfree(tt);
}
}
static void
mlx5_eswitch_termtbl_actions_move(struct mlx5_flow_act *src,
struct mlx5_flow_act *dst)
{
if (!(src->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH))
return;
src->action &= ~MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH;
dst->action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH;
memcpy(&dst->vlan[0], &src->vlan[0], sizeof(src->vlan[0]));
memset(&src->vlan[0], 0, sizeof(src->vlan[0]));
if (!(src->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2))
return;
src->action &= ~MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2;
dst->action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2;
memcpy(&dst->vlan[1], &src->vlan[1], sizeof(src->vlan[1]));
memset(&src->vlan[1], 0, sizeof(src->vlan[1]));
}
bool
mlx5_eswitch_termtbl_required(struct mlx5_eswitch *esw,
struct mlx5_flow_act *flow_act,
struct mlx5_flow_spec *spec)
{
u32 port_mask = MLX5_GET(fte_match_param, spec->match_criteria,
misc_parameters.source_port);
u32 port_value = MLX5_GET(fte_match_param, spec->match_value,
misc_parameters.source_port);
if (!MLX5_CAP_ESW_FLOWTABLE_FDB(esw->dev, termination_table))
return false;
/* push vlan on RX */
return (flow_act->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH) &&
((port_mask & port_value) == MLX5_VPORT_UPLINK);
}
struct mlx5_flow_handle *
mlx5_eswitch_add_termtbl_rule(struct mlx5_eswitch *esw,
struct mlx5_flow_table *fdb,
struct mlx5_flow_spec *spec,
struct mlx5_esw_flow_attr *attr,
struct mlx5_flow_act *flow_act,
struct mlx5_flow_destination *dest,
int num_dest)
{
struct mlx5_flow_act term_tbl_act = {};
struct mlx5_flow_handle *rule = NULL;
bool term_table_created = false;
int num_vport_dests = 0;
int i, curr_dest;
mlx5_eswitch_termtbl_actions_move(flow_act, &term_tbl_act);
term_tbl_act.action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
for (i = 0; i < num_dest; i++) {
struct mlx5_termtbl_handle *tt;
/* only vport destinations can be terminated */
if (dest[i].type != MLX5_FLOW_DESTINATION_TYPE_VPORT)
continue;
/* get the terminating table for the action list */
tt = mlx5_eswitch_termtbl_get_create(esw, &term_tbl_act,
&dest[i]);
if (IS_ERR(tt)) {
esw_warn(esw->dev, "Failed to create termination table\n");
goto revert_changes;
}
attr->dests[num_vport_dests].termtbl = tt;
num_vport_dests++;
/* link the destination with the termination table */
dest[i].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
dest[i].ft = tt->termtbl;
term_table_created = true;
}
/* at least one destination should reference a termination table */
if (!term_table_created)
goto revert_changes;
/* create the FTE */
rule = mlx5_add_flow_rules(fdb, spec, flow_act, dest, num_dest);
if (IS_ERR(rule))
goto revert_changes;
goto out;
revert_changes:
/* revert the changes that were made to the original flow_act
* and fall-back to the original rule actions
*/
mlx5_eswitch_termtbl_actions_move(&term_tbl_act, flow_act);
for (curr_dest = 0; curr_dest < num_vport_dests; curr_dest++) {
struct mlx5_termtbl_handle *tt = attr->dests[curr_dest].termtbl;
/* search for the destination associated with the
* current term table
*/
for (i = 0; i < num_dest; i++) {
if (dest[i].ft != tt->termtbl)
continue;
memset(&dest[i], 0, sizeof(dest[i]));
dest[i].type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
dest[i].vport.num = tt->dest.vport.num;
dest[i].vport.vhca_id = tt->dest.vport.vhca_id;
mlx5_eswitch_termtbl_put(esw, tt);
break;
}
}
rule = mlx5_add_flow_rules(fdb, spec, flow_act, dest, num_dest);
out:
return rule;
}
