/*
* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <net/flow_dissector.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_gact.h>
#include <net/tc_act/tc_skbedit.h>
#include <linux/mlx5/fs.h>
#include <linux/mlx5/device.h>
#include <linux/rhashtable.h>
#include "en.h"
#include "en_tc.h"
struct mlx5e_tc_flow {
struct rhash_head node;
u64 cookie;
struct mlx5_flow_rule *rule;
};
#define MLX5E_TC_FLOW_TABLE_NUM_ENTRIES 1024
#define MLX5E_TC_FLOW_TABLE_NUM_GROUPS 4
static struct mlx5_flow_rule *mlx5e_tc_add_flow(struct mlx5e_priv *priv,
u32 *match_c, u32 *match_v,
u32 action, u32 flow_tag)
{
struct mlx5_flow_destination dest = {
.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE,
{.ft = priv->fts.vlan.t},
};
struct mlx5_flow_rule *rule;
bool table_created = false;
if (IS_ERR_OR_NULL(priv->fts.tc.t)) {
priv->fts.tc.t =
mlx5_create_auto_grouped_flow_table(priv->fts.ns, 0,
MLX5E_TC_FLOW_TABLE_NUM_ENTRIES,
MLX5E_TC_FLOW_TABLE_NUM_GROUPS);
if (IS_ERR(priv->fts.tc.t)) {
netdev_err(priv->netdev,
"Failed to create tc offload table\n");
return ERR_CAST(priv->fts.tc.t);
}
table_created = true;
}
rule = mlx5_add_flow_rule(priv->fts.tc.t, MLX5_MATCH_OUTER_HEADERS,
match_c, match_v,
action, flow_tag,
action & MLX5_FLOW_CONTEXT_ACTION_FWD_DEST ? &dest : NULL);
if (IS_ERR(rule) && table_created) {
mlx5_destroy_flow_table(priv->fts.tc.t);
priv->fts.tc.t = NULL;
}
return rule;
}
static void mlx5e_tc_del_flow(struct mlx5e_priv *priv,
struct mlx5_flow_rule *rule)
{
mlx5_del_flow_rule(rule);
if (!mlx5e_tc_num_filters(priv)) {
mlx5_destroy_flow_table(priv->fts.tc.t);
priv->fts.tc.t = NULL;
}
}
static int parse_cls_flower(struct mlx5e_priv *priv,
u32 *match_c, u32 *match_v,
struct tc_cls_flower_offload *f)
{
void *headers_c = MLX5_ADDR_OF(fte_match_param, match_c, outer_headers);
void *headers_v = MLX5_ADDR_OF(fte_match_param, match_v, outer_headers);
u16 addr_type = 0;
u8 ip_proto = 0;
if (f->dissector->used_keys &
~(BIT(FLOW_DISSECTOR_KEY_CONTROL) |
BIT(FLOW_DISSECTOR_KEY_BASIC) |
BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
BIT(FLOW_DISSECTOR_KEY_PORTS))) {
netdev_warn(priv->netdev, "Unsupported key used: 0x%x\n",
f->dissector->used_keys);
return -EOPNOTSUPP;
}
if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
struct flow_dissector_key_control *key =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_BASIC,
f->key);
addr_type = key->addr_type;
}
if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
struct flow_dissector_key_basic *key =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_BASIC,
f->key);
struct flow_dissector_key_basic *mask =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_BASIC,
f->mask);
ip_proto = key->ip_proto;
MLX5_SET(fte_match_set_lyr_2_4, headers_c, ethertype,
ntohs(mask->n_proto));
MLX5_SET(fte_match_set_lyr_2_4, headers_v, ethertype,
ntohs(key->n_proto));
MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_protocol,
mask->ip_proto);
MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol,
key->ip_proto);
}
if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
struct flow_dissector_key_eth_addrs *key =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_ETH_ADDRS,
f->key);
struct flow_dissector_key_eth_addrs *mask =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_ETH_ADDRS,
f->mask);
ether_addr_copy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_c,
dmac_47_16),
mask->dst);
ether_addr_copy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_v,
dmac_47_16),
key->dst);
ether_addr_copy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_c,
smac_47_16),
mask->src);
ether_addr_copy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_v,
smac_47_16),
key->src);
}
if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
struct flow_dissector_key_ipv4_addrs *key =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_IPV4_ADDRS,
f->key);
struct flow_dissector_key_ipv4_addrs *mask =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_IPV4_ADDRS,
f->mask);
memcpy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_c,
src_ipv4_src_ipv6.ipv4_layout.ipv4),
&mask->src, sizeof(mask->src));
memcpy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_v,
src_ipv4_src_ipv6.ipv4_layout.ipv4),
&key->src, sizeof(key->src));
memcpy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_c,
dst_ipv4_dst_ipv6.ipv4_layout.ipv4),
&mask->dst, sizeof(mask->dst));
memcpy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_v,
dst_ipv4_dst_ipv6.ipv4_layout.ipv4),
&key->dst, sizeof(key->dst));
}
if (addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
struct flow_dissector_key_ipv6_addrs *key =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_IPV6_ADDRS,
f->key);
struct flow_dissector_key_ipv6_addrs *mask =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_IPV6_ADDRS,
f->mask);
memcpy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_c,
src_ipv4_src_ipv6.ipv6_layout.ipv6),
&mask->src, sizeof(mask->src));
memcpy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_v,
src_ipv4_src_ipv6.ipv6_layout.ipv6),
&key->src, sizeof(key->src));
memcpy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_c,
dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
&mask->dst, sizeof(mask->dst));
memcpy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_v,
dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
&key->dst, sizeof(key->dst));
}
if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_PORTS)) {
struct flow_dissector_key_ports *key =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_PORTS,
f->key);
struct flow_dissector_key_ports *mask =
skb_flow_dissector_target(f->dissector,
FLOW_DISSECTOR_KEY_PORTS,
f->mask);
switch (ip_proto) {
case IPPROTO_TCP:
MLX5_SET(fte_match_set_lyr_2_4, headers_c,
tcp_sport, ntohs(mask->src));
MLX5_SET(fte_match_set_lyr_2_4, headers_v,
tcp_sport, ntohs(key->src));
MLX5_SET(fte_match_set_lyr_2_4, headers_c,
tcp_dport, ntohs(mask->dst));
MLX5_SET(fte_match_set_lyr_2_4, headers_v,
tcp_dport, ntohs(key->dst));
break;
case IPPROTO_UDP:
MLX5_SET(fte_match_set_lyr_2_4, headers_c,
udp_sport, ntohs(mask->src));
MLX5_SET(fte_match_set_lyr_2_4, headers_v,
udp_sport, ntohs(key->src));
MLX5_SET(fte_match_set_lyr_2_4, headers_c,
udp_dport, ntohs(mask->dst));
MLX5_SET(fte_match_set_lyr_2_4, headers_v,
udp_dport, ntohs(key->dst));
break;
default:
netdev_err(priv->netdev,
"Only UDP and TCP transport are supported\n");
return -EINVAL;
}
}
return 0;
}
static int parse_tc_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
u32 *action, u32 *flow_tag)
{
const struct tc_action *a;
if (tc_no_actions(exts))
return -EINVAL;
*flow_tag = MLX5_FS_DEFAULT_FLOW_TAG;
*action = 0;
tc_for_each_action(a, exts) {
/* Only support a single action per rule */
if (*action)
return -EINVAL;
if (is_tcf_gact_shot(a)) {
*action |= MLX5_FLOW_CONTEXT_ACTION_DROP;
continue;
}
if (is_tcf_skbedit_mark(a)) {
u32 mark = tcf_skbedit_mark(a);
if (mark & ~MLX5E_TC_FLOW_ID_MASK) {
netdev_warn(priv->netdev, "Bad flow mark - only 16 bit is supported: 0x%x\n",
mark);
return -EINVAL;
}
*flow_tag = mark;
*action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
continue;
}
return -EINVAL;
}
return 0;
}
int mlx5e_configure_flower(struct mlx5e_priv *priv, __be16 protocol,
struct tc_cls_flower_offload *f)
{
struct mlx5e_tc_flow_table *tc = &priv->fts.tc;
u32 *match_c;
u32 *match_v;
int err = 0;
u32 flow_tag;
u32 action;
struct mlx5e_tc_flow *flow;
struct mlx5_flow_rule *old = NULL;
flow = rhashtable_lookup_fast(&tc->ht, &f->cookie,
tc->ht_params);
if (flow)
old = flow->rule;
else
flow = kzalloc(sizeof(*flow), GFP_KERNEL);
match_c = kzalloc(MLX5_ST_SZ_BYTES(fte_match_param), GFP_KERNEL);
match_v = kzalloc(MLX5_ST_SZ_BYTES(fte_match_param), GFP_KERNEL);
if (!match_c || !match_v || !flow) {
err = -ENOMEM;
goto err_free;
}
flow->cookie = f->cookie;
err = parse_cls_flower(priv, match_c, match_v, f);
if (err < 0)
goto err_free;
err = parse_tc_actions(priv, f->exts, &action, &flow_tag);
if (err < 0)
goto err_free;
err = rhashtable_insert_fast(&tc->ht, &flow->node,
tc->ht_params);
if (err)
goto err_free;
flow->rule = mlx5e_tc_add_flow(priv, match_c, match_v, action,
flow_tag);
if (IS_ERR(flow->rule)) {
err = PTR_ERR(flow->rule);
goto err_hash_del;
}
if (old)
mlx5e_tc_del_flow(priv, old);
goto out;
err_hash_del:
rhashtable_remove_fast(&tc->ht, &flow->node, tc->ht_params);
err_free:
if (!old)
kfree(flow);
out:
kfree(match_c);
kfree(match_v);
return err;
}
int mlx5e_delete_flower(struct mlx5e_priv *priv,
struct tc_cls_flower_offload *f)
{
struct mlx5e_tc_flow *flow;
struct mlx5e_tc_flow_table *tc = &priv->fts.tc;
flow = rhashtable_lookup_fast(&tc->ht, &f->cookie,
tc->ht_params);
if (!flow)
return -EINVAL;
rhashtable_remove_fast(&tc->ht, &flow->node, tc->ht_params);
mlx5e_tc_del_flow(priv, flow->rule);
kfree(flow);
return 0;
}
static const struct rhashtable_params mlx5e_tc_flow_ht_params = {
.head_offset = offsetof(struct mlx5e_tc_flow, node),
.key_offset = offsetof(struct mlx5e_tc_flow, cookie),
.key_len = sizeof(((struct mlx5e_tc_flow *)0)->cookie),
.automatic_shrinking = true,
};
int mlx5e_tc_init(struct mlx5e_priv *priv)
{
struct mlx5e_tc_flow_table *tc = &priv->fts.tc;
tc->ht_params = mlx5e_tc_flow_ht_params;
return rhashtable_init(&tc->ht, &tc->ht_params);
}
static void _mlx5e_tc_del_flow(void *ptr, void *arg)
{
struct mlx5e_tc_flow *flow = ptr;
struct mlx5e_priv *priv = arg;
mlx5e_tc_del_flow(priv, flow->rule);
kfree(flow);
}
void mlx5e_tc_cleanup(struct mlx5e_priv *priv)
{
struct mlx5e_tc_flow_table *tc = &priv->fts.tc;
rhashtable_free_and_destroy(&tc->ht, _mlx5e_tc_del_flow, priv);
if (!IS_ERR_OR_NULL(priv->fts.tc.t)) {
mlx5_destroy_flow_table(priv->fts.tc.t);
priv->fts.tc.t = NULL;
}
}
