Release 4.11 drivers/net/ethernet/mellanox/mlx5/core/lag.c
/*
* 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/netdevice.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/vport.h>
#include "mlx5_core.h"
enum {
MLX5_LAG_FLAG_BONDED = 1 << 0,
};
struct lag_func {
struct mlx5_core_dev *dev;
struct net_device *netdev;
};
/* Used for collection of netdev event info. */
struct lag_tracker {
enum netdev_lag_tx_type tx_type;
struct netdev_lag_lower_state_info netdev_state[MLX5_MAX_PORTS];
bool is_bonded;
};
/* LAG data of a ConnectX card.
* It serves both its phys functions.
*/
struct mlx5_lag {
u8 flags;
u8 v2p_map[MLX5_MAX_PORTS];
struct lag_func pf[MLX5_MAX_PORTS];
struct lag_tracker tracker;
struct delayed_work bond_work;
struct notifier_block nb;
};
/* General purpose, use for short periods of time.
* Beware of lock dependencies (preferably, no locks should be acquired
* under it).
*/
static DEFINE_MUTEX(lag_mutex);
static int mlx5_cmd_create_lag(struct mlx5_core_dev *dev, u8 remap_port1,
u8 remap_port2)
{
u32 in[MLX5_ST_SZ_DW(create_lag_in)] = {0};
u32 out[MLX5_ST_SZ_DW(create_lag_out)] = {0};
void *lag_ctx = MLX5_ADDR_OF(create_lag_in, in, ctx);
MLX5_SET(create_lag_in, in, opcode, MLX5_CMD_OP_CREATE_LAG);
MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);
return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
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static int mlx5_cmd_modify_lag(struct mlx5_core_dev *dev, u8 remap_port1,
u8 remap_port2)
{
u32 in[MLX5_ST_SZ_DW(modify_lag_in)] = {0};
u32 out[MLX5_ST_SZ_DW(modify_lag_out)] = {0};
void *lag_ctx = MLX5_ADDR_OF(modify_lag_in, in, ctx);
MLX5_SET(modify_lag_in, in, opcode, MLX5_CMD_OP_MODIFY_LAG);
MLX5_SET(modify_lag_in, in, field_select, 0x1);
MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);
return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
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static int mlx5_cmd_destroy_lag(struct mlx5_core_dev *dev)
{
u32 in[MLX5_ST_SZ_DW(destroy_lag_in)] = {0};
u32 out[MLX5_ST_SZ_DW(destroy_lag_out)] = {0};
MLX5_SET(destroy_lag_in, in, opcode, MLX5_CMD_OP_DESTROY_LAG);
return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
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int mlx5_cmd_create_vport_lag(struct mlx5_core_dev *dev)
{
u32 in[MLX5_ST_SZ_DW(create_vport_lag_in)] = {0};
u32 out[MLX5_ST_SZ_DW(create_vport_lag_out)] = {0};
MLX5_SET(create_vport_lag_in, in, opcode, MLX5_CMD_OP_CREATE_VPORT_LAG);
return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
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EXPORT_SYMBOL(mlx5_cmd_create_vport_lag);
int mlx5_cmd_destroy_vport_lag(struct mlx5_core_dev *dev)
{
u32 in[MLX5_ST_SZ_DW(destroy_vport_lag_in)] = {0};
u32 out[MLX5_ST_SZ_DW(destroy_vport_lag_out)] = {0};
MLX5_SET(destroy_vport_lag_in, in, opcode, MLX5_CMD_OP_DESTROY_VPORT_LAG);
return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
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EXPORT_SYMBOL(mlx5_cmd_destroy_vport_lag);
static struct mlx5_lag *mlx5_lag_dev_get(struct mlx5_core_dev *dev)
{
return dev->priv.lag;
}
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static int mlx5_lag_dev_get_netdev_idx(struct mlx5_lag *ldev,
struct net_device *ndev)
{
int i;
for (i = 0; i < MLX5_MAX_PORTS; i++)
if (ldev->pf[i].netdev == ndev)
return i;
return -1;
}
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static bool mlx5_lag_is_bonded(struct mlx5_lag *ldev)
{
return !!(ldev->flags & MLX5_LAG_FLAG_BONDED);
}
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static void mlx5_infer_tx_affinity_mapping(struct lag_tracker *tracker,
u8 *port1, u8 *port2)
{
if (tracker->tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) {
if (tracker->netdev_state[0].tx_enabled) {
*port1 = 1;
*port2 = 1;
} else {
*port1 = 2;
*port2 = 2;
}
} else {
*port1 = 1;
*port2 = 2;
if (!tracker->netdev_state[0].link_up)
*port1 = 2;
else if (!tracker->netdev_state[1].link_up)
*port2 = 1;
}
}
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static void mlx5_activate_lag(struct mlx5_lag *ldev,
struct lag_tracker *tracker)
{
struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
int err;
ldev->flags |= MLX5_LAG_FLAG_BONDED;
mlx5_infer_tx_affinity_mapping(tracker, &ldev->v2p_map[0],
&ldev->v2p_map[1]);
err = mlx5_cmd_create_lag(dev0, ldev->v2p_map[0], ldev->v2p_map[1]);
if (err)
mlx5_core_err(dev0,
"Failed to create LAG (%d)\n",
err);
}
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static void mlx5_deactivate_lag(struct mlx5_lag *ldev)
{
struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
int err;
ldev->flags &= ~MLX5_LAG_FLAG_BONDED;
err = mlx5_cmd_destroy_lag(dev0);
if (err)
mlx5_core_err(dev0,
"Failed to destroy LAG (%d)\n",
err);
}
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static void mlx5_do_bond(struct mlx5_lag *ldev)
{
struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
struct mlx5_core_dev *dev1 = ldev->pf[1].dev;
struct lag_tracker tracker;
u8 v2p_port1, v2p_port2;
int i, err;
if (!dev0 || !dev1)
return;
mutex_lock(&lag_mutex);
tracker = ldev->tracker;
mutex_unlock(&lag_mutex);
if (tracker.is_bonded && !mlx5_lag_is_bonded(ldev)) {
if (mlx5_sriov_is_enabled(dev0) ||
mlx5_sriov_is_enabled(dev1)) {
mlx5_core_warn(dev0, "LAG is not supported with SRIOV");
return;
}
for (i = 0; i < MLX5_MAX_PORTS; i++)
mlx5_remove_dev_by_protocol(ldev->pf[i].dev,
MLX5_INTERFACE_PROTOCOL_IB);
mlx5_activate_lag(ldev, &tracker);
mlx5_add_dev_by_protocol(dev0, MLX5_INTERFACE_PROTOCOL_IB);
mlx5_nic_vport_enable_roce(dev1);
} else if (tracker.is_bonded && mlx5_lag_is_bonded(ldev)) {
mlx5_infer_tx_affinity_mapping(&tracker, &v2p_port1,
&v2p_port2);
if ((v2p_port1 != ldev->v2p_map[0]) ||
(v2p_port2 != ldev->v2p_map[1])) {
ldev->v2p_map[0] = v2p_port1;
ldev->v2p_map[1] = v2p_port2;
err = mlx5_cmd_modify_lag(dev0, v2p_port1, v2p_port2);
if (err)
mlx5_core_err(dev0,
"Failed to modify LAG (%d)\n",
err);
}
} else if (!tracker.is_bonded && mlx5_lag_is_bonded(ldev)) {
mlx5_remove_dev_by_protocol(dev0, MLX5_INTERFACE_PROTOCOL_IB);
mlx5_nic_vport_disable_roce(dev1);
mlx5_deactivate_lag(ldev);
for (i = 0; i < MLX5_MAX_PORTS; i++)
if (ldev->pf[i].dev)
mlx5_add_dev_by_protocol(ldev->pf[i].dev,
MLX5_INTERFACE_PROTOCOL_IB);
}
}
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static void mlx5_queue_bond_work(struct mlx5_lag *ldev, unsigned long delay)
{
schedule_delayed_work(&ldev->bond_work, delay);
}
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static void mlx5_do_bond_work(struct work_struct *work)
{
struct delayed_work *delayed_work = to_delayed_work(work);
struct mlx5_lag *ldev = container_of(delayed_work, struct mlx5_lag,
bond_work);
int status;
status = mlx5_dev_list_trylock();
if (!status) {
/* 1 sec delay. */
mlx5_queue_bond_work(ldev, HZ);
return;
}
mlx5_do_bond(ldev);
mlx5_dev_list_unlock();
}
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static int mlx5_handle_changeupper_event(struct mlx5_lag *ldev,
struct lag_tracker *tracker,
struct net_device *ndev,
struct netdev_notifier_changeupper_info *info)
{
struct net_device *upper = info->upper_dev, *ndev_tmp;
struct netdev_lag_upper_info *lag_upper_info = NULL;
bool is_bonded;
int bond_status = 0;
int num_slaves = 0;
int idx;
if (!netif_is_lag_master(upper))
return 0;
if (info->linking)
lag_upper_info = info->upper_info;
/* The event may still be of interest if the slave does not belong to
* us, but is enslaved to a master which has one or more of our netdevs
* as slaves (e.g., if a new slave is added to a master that bonds two
* of our netdevs, we should unbond).
*/
rcu_read_lock();
for_each_netdev_in_bond_rcu(upper, ndev_tmp) {
idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev_tmp);
if (idx > -1)
bond_status |= (1 << idx);
num_slaves++;
}
rcu_read_unlock();
/* None of this lagdev's netdevs are slaves of this master. */
if (!(bond_status & 0x3))
return 0;
if (lag_upper_info)
tracker->tx_type = lag_upper_info->tx_type;
/* Determine bonding status:
* A device is considered bonded if both its physical ports are slaves
* of the same lag master, and only them.
* Lag mode must be activebackup or hash.
*/
is_bonded = (num_slaves == MLX5_MAX_PORTS) &&
(bond_status == 0x3) &&
((tracker->tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) ||
(tracker->tx_type == NETDEV_LAG_TX_TYPE_HASH));
if (tracker->is_bonded != is_bonded) {
tracker->is_bonded = is_bonded;
return 1;
}
return 0;
}
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static int mlx5_handle_changelowerstate_event(struct mlx5_lag *ldev,
struct lag_tracker *tracker,
struct net_device *ndev,
struct netdev_notifier_changelowerstate_info *info)
{
struct netdev_lag_lower_state_info *lag_lower_info;
int idx;
if (!netif_is_lag_port(ndev))
return 0;
idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev);
if (idx == -1)
return 0;
/* This information is used to determine virtual to physical
* port mapping.
*/
lag_lower_info = info->lower_state_info;
if (!lag_lower_info)
return 0;
tracker->netdev_state[idx] = *lag_lower_info;
return 1;
}
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static int mlx5_lag_netdev_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
struct lag_tracker tracker;
struct mlx5_lag *ldev;
int changed = 0;
if (!net_eq(dev_net(ndev), &init_net))
return NOTIFY_DONE;
if ((event != NETDEV_CHANGEUPPER) && (event != NETDEV_CHANGELOWERSTATE))
return NOTIFY_DONE;
ldev = container_of(this, struct mlx5_lag, nb);
tracker = ldev->tracker;
switch (event) {
case NETDEV_CHANGEUPPER:
changed = mlx5_handle_changeupper_event(ldev, &tracker, ndev,
ptr);
break;
case NETDEV_CHANGELOWERSTATE:
changed = mlx5_handle_changelowerstate_event(ldev, &tracker,
ndev, ptr);
break;
}
mutex_lock(&lag_mutex);
ldev->tracker = tracker;
mutex_unlock(&lag_mutex);
if (changed)
mlx5_queue_bond_work(ldev, 0);
return NOTIFY_DONE;
}
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static struct mlx5_lag *mlx5_lag_dev_alloc(void)
{
struct mlx5_lag *ldev;
ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
if (!ldev)
return NULL;
INIT_DELAYED_WORK(&ldev->bond_work, mlx5_do_bond_work);
return ldev;
}
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static void mlx5_lag_dev_free(struct mlx5_lag *ldev)
{
kfree(ldev);
}
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static void mlx5_lag_dev_add_pf(struct mlx5_lag *ldev,
struct mlx5_core_dev *dev,
struct net_device *netdev)
{
unsigned int fn = PCI_FUNC(dev->pdev->devfn);
if (fn >= MLX5_MAX_PORTS)
return;
mutex_lock(&lag_mutex);
ldev->pf[fn].dev = dev;
ldev->pf[fn].netdev = netdev;
ldev->tracker.netdev_state[fn].link_up = 0;
ldev->tracker.netdev_state[fn].tx_enabled = 0;
dev->priv.lag = ldev;
mutex_unlock(&lag_mutex);
}
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static void mlx5_lag_dev_remove_pf(struct mlx5_lag *ldev,
struct mlx5_core_dev *dev)
{
int i;
for (i = 0; i < MLX5_MAX_PORTS; i++)
if (ldev->pf[i].dev == dev)
break;
if (i == MLX5_MAX_PORTS)
return;
mutex_lock(&lag_mutex);
memset(&ldev->pf[i], 0, sizeof(*ldev->pf));
dev->priv.lag = NULL;
mutex_unlock(&lag_mutex);
}
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/* Must be called with intf_mutex held */
void mlx5_lag_add(struct mlx5_core_dev *dev, struct net_device *netdev)
{
struct mlx5_lag *ldev = NULL;
struct mlx5_core_dev *tmp_dev;
if (!MLX5_CAP_GEN(dev, vport_group_manager) ||
!MLX5_CAP_GEN(dev, lag_master) ||
(MLX5_CAP_GEN(dev, num_lag_ports) != MLX5_MAX_PORTS))
return;
tmp_dev = mlx5_get_next_phys_dev(dev);
if (tmp_dev)
ldev = tmp_dev->priv.lag;
if (!ldev) {
ldev = mlx5_lag_dev_alloc();
if (!ldev) {
mlx5_core_err(dev, "Failed to alloc lag dev\n");
return;
}
}
mlx5_lag_dev_add_pf(ldev, dev, netdev);
if (!ldev->nb.notifier_call) {
ldev->nb.notifier_call = mlx5_lag_netdev_event;
if (register_netdevice_notifier(&ldev->nb)) {
ldev->nb.notifier_call = NULL;
mlx5_core_err(dev, "Failed to register LAG netdev notifier\n");
}
}
}
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| Total | 158 | 100.00% | 2 | 100.00% |
/* Must be called with intf_mutex held */
void mlx5_lag_remove(struct mlx5_core_dev *dev)
{
struct mlx5_lag *ldev;
int i;
ldev = mlx5_lag_dev_get(dev);
if (!ldev)
return;
if (mlx5_lag_is_bonded(ldev))
mlx5_deactivate_lag(ldev);
mlx5_lag_dev_remove_pf(ldev, dev);
for (i = 0; i < MLX5_MAX_PORTS; i++)
if (ldev->pf[i].dev)
break;
if (i == MLX5_MAX_PORTS) {
if (ldev->nb.notifier_call)
unregister_netdevice_notifier(&ldev->nb);
cancel_delayed_work_sync(&ldev->bond_work);
mlx5_lag_dev_free(ldev);
}
}
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bool mlx5_lag_is_active(struct mlx5_core_dev *dev)
{
struct mlx5_lag *ldev;
bool res;
mutex_lock(&lag_mutex);
ldev = mlx5_lag_dev_get(dev);
res = ldev && mlx5_lag_is_bonded(ldev);
mutex_unlock(&lag_mutex);
return res;
}
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EXPORT_SYMBOL(mlx5_lag_is_active);
struct net_device *mlx5_lag_get_roce_netdev(struct mlx5_core_dev *dev)
{
struct net_device *ndev = NULL;
struct mlx5_lag *ldev;
mutex_lock(&lag_mutex);
ldev = mlx5_lag_dev_get(dev);
if (!(ldev && mlx5_lag_is_bonded(ldev)))
goto unlock;
if (ldev->tracker.tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) {
ndev = ldev->tracker.netdev_state[0].tx_enabled ?
ldev->pf[0].netdev : ldev->pf[1].netdev;
} else {
ndev = ldev->pf[0].netdev;
}
if (ndev)
dev_hold(ndev);
unlock:
mutex_unlock(&lag_mutex);
return ndev;
}
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EXPORT_SYMBOL(mlx5_lag_get_roce_netdev);
bool mlx5_lag_intf_add(struct mlx5_interface *intf, struct mlx5_priv *priv)
{
struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev,
priv);
struct mlx5_lag *ldev;
if (intf->protocol != MLX5_INTERFACE_PROTOCOL_IB)
return true;
ldev = mlx5_lag_dev_get(dev);
if (!ldev || !mlx5_lag_is_bonded(ldev) || ldev->pf[0].dev == dev)
return true;
/* If bonded, we do not add an IB device for PF1. */
return false;
}
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Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aviv Heller | 2578 | 99.46% | 5 | 71.43% |
| Talat Batheesh | 8 | 0.31% | 1 | 14.29% |
| Mohamad Haj Yahia | 6 | 0.23% | 1 | 14.29% |
| Total | 2592 | 100.00% | 7 | 100.00% |
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