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net/mlx5e: Introduce tc offload support

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Extend ndo_setup_tc() to support ingress tc offloading. Will be used by
later patches to offload tc flower filter.

Feature is off by default and could be enabled by issuing:
 # ethtool  -K eth0 hw-tc-offload on

Offloads flow table is dynamically created when first filter is
added.
Rules are saved in a hash table that is maintained by the consumer (for
example - the flower offload in the next patch).
When last filter is removed and no filters exist in the hash table, the
offload flow table is destroyed.

Signed-off-by: Amir Vadai <amir@vadai.me>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amir Vadai 2016-03-08 12:42:36 +02:00 committed by David S. Miller
parent b6172aac71
commit e8f887ac6a
5 changed files with 222 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/mellanox/mlx5/core/Makefile
View File

@ -6,6 +6,6 @@ mlx5_core-y := main.o cmd.o debugfs.o fw.o eq.o uar.o pagealloc.o \
mlx5_core-$(CONFIG_MLX5_CORE_EN) += wq.o eswitch.o \
en_main.o en_fs.o en_ethtool.o en_tx.o en_rx.o \
en_txrx.o en_clock.o vxlan.o
en_txrx.o en_clock.o vxlan.o en_tc.o
mlx5_core-$(CONFIG_MLX5_CORE_EN_DCB) += en_dcbnl.o

9
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -43,6 +43,7 @@
#include <linux/mlx5/port.h>
#include <linux/mlx5/vport.h>
#include <linux/mlx5/transobj.h>
#include <linux/rhashtable.h>
#include "wq.h"
#include "mlx5_core.h"
@ -527,8 +528,16 @@ struct mlx5e_flow_table {
struct mlx5_flow_group **g;
};
struct mlx5e_tc_flow_table {
struct mlx5_flow_table *t;
struct rhashtable_params ht_params;
struct rhashtable ht;
};
struct mlx5e_flow_tables {
struct mlx5_flow_namespace *ns;
struct mlx5e_tc_flow_table tc;
struct mlx5e_flow_table vlan;
struct mlx5e_flow_table main;
};

38
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -30,9 +30,12 @@
* SOFTWARE.
*/
#include <net/tc_act/tc_gact.h>
#include <net/pkt_cls.h>
#include <linux/mlx5/fs.h>
#include <net/vxlan.h>
#include "en.h"
#include "en_tc.h"
#include "eswitch.h"
#include "vxlan.h"
@ -1883,6 +1886,17 @@ static int mlx5e_setup_tc(struct net_device *netdev, u8 tc)
static int mlx5e_ndo_setup_tc(struct net_device *dev, u32 handle,
__be16 proto, struct tc_to_netdev *tc)
{
struct mlx5e_priv *priv = netdev_priv(dev);
if (TC_H_MAJ(handle) != TC_H_MAJ(TC_H_INGRESS))
goto mqprio;
switch (tc->type) {
default:
return -EOPNOTSUPP;
}
mqprio:
if (tc->type != TC_SETUP_MQPRIO)
return -EINVAL;
@ -1968,6 +1982,13 @@ static int mlx5e_set_features(struct net_device *netdev,
mlx5e_disable_vlan_filter(priv);
}
if ((changes & NETIF_F_HW_TC) && !(features & NETIF_F_HW_TC) &&
mlx5e_tc_num_filters(priv)) {
netdev_err(netdev,
"Active offloaded tc filters, can't turn hw_tc_offload off\n");
return -EINVAL;
}
return err;
}
@ -2375,6 +2396,13 @@ static void mlx5e_build_netdev(struct net_device *netdev)
if (!priv->params.lro_en)
netdev->features &= ~NETIF_F_LRO;
#define FT_CAP(f) MLX5_CAP_FLOWTABLE(mdev, flow_table_properties_nic_receive.f)
if (FT_CAP(flow_modify_en) &&
FT_CAP(modify_root) &&
FT_CAP(identified_miss_table_mode) &&
FT_CAP(flow_table_modify))
priv->netdev->hw_features |= NETIF_F_HW_TC;
netdev->features |= NETIF_F_HIGHDMA;
netdev->priv_flags |= IFF_UNICAST_FLT;
@ -2496,6 +2524,10 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
mlx5e_vxlan_init(priv);
err = mlx5e_tc_init(priv);
if (err)
goto err_destroy_flow_tables;
#ifdef CONFIG_MLX5_CORE_EN_DCB
mlx5e_dcbnl_ieee_setets_core(priv, &priv->params.ets);
#endif
@ -2503,7 +2535,7 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
err = register_netdev(netdev);
if (err) {
mlx5_core_err(mdev, "register_netdev failed, %d\n", err);
goto err_destroy_flow_tables;
goto err_tc_cleanup;
}
if (mlx5e_vxlan_allowed(mdev))
@ -2514,6 +2546,9 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
return priv;
err_tc_cleanup:
mlx5e_tc_cleanup(priv);
err_destroy_flow_tables:
mlx5e_destroy_flow_tables(priv);
@ -2561,6 +2596,7 @@ static void mlx5e_destroy_netdev(struct mlx5_core_dev *mdev, void *vpriv)
mlx5e_disable_async_events(priv);
flush_scheduled_work();
unregister_netdev(netdev);
mlx5e_tc_cleanup(priv);
mlx5e_vxlan_cleanup(priv);
mlx5e_destroy_flow_tables(priv);
mlx5e_destroy_tirs(priv);

131
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c Normal file
View File

@ -0,0 +1,131 @@
/*
* 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 <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 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;
}
}

44
drivers/net/ethernet/mellanox/mlx5/core/en_tc.h Normal file
View File

@ -0,0 +1,44 @@
/*
* 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.
*/
#ifndef __MLX5_EN_TC_H__
#define __MLX5_EN_TC_H__
int mlx5e_tc_init(struct mlx5e_priv *priv);
void mlx5e_tc_cleanup(struct mlx5e_priv *priv);
static inline int mlx5e_tc_num_filters(struct mlx5e_priv *priv)
{
return atomic_read(&priv->fts.tc.ht.nelems);
}
#endif /* __MLX5_EN_TC_H__ */