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* Copyright (C) 2018 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. 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 "main.h"
/* LAG group config flags. */
#define NFP_FL_LAG_LAST BIT(1)
#define NFP_FL_LAG_FIRST BIT(2)
#define NFP_FL_LAG_DATA BIT(3)
#define NFP_FL_LAG_XON BIT(4)
#define NFP_FL_LAG_SYNC BIT(5)
#define NFP_FL_LAG_SWITCH BIT(6)
#define NFP_FL_LAG_RESET BIT(7)
/* LAG port state flags. */
#define NFP_PORT_LAG_LINK_UP BIT(0)
#define NFP_PORT_LAG_TX_ENABLED BIT(1)
#define NFP_PORT_LAG_CHANGED BIT(2)
enum nfp_fl_lag_batch {
NFP_FL_LAG_BATCH_FIRST,
NFP_FL_LAG_BATCH_MEMBER,
NFP_FL_LAG_BATCH_FINISHED
};
/**
* struct nfp_flower_cmsg_lag_config - control message payload for LAG config
* @ctrl_flags: Configuration flags
* @reserved: Reserved for future use
* @ttl: Time to live of packet - host always sets to 0xff
* @pkt_number: Config message packet number - increment for each message
* @batch_ver: Batch version of messages - increment for each batch of messages
* @group_id: Group ID applicable
* @group_inst: Group instance number - increment when group is reused
* @members: Array of 32-bit words listing all active group members
*/
struct nfp_flower_cmsg_lag_config {
u8 ctrl_flags;
u8 reserved[2];
u8 ttl;
__be32 pkt_number;
__be32 batch_ver;
__be32 group_id;
__be32 group_inst;
__be32 members[];
};
/**
* struct nfp_fl_lag_group - list entry for each LAG group
* @group_id: Assigned group ID for host/kernel sync
* @group_inst: Group instance in case of ID reuse
* @list: List entry
* @master_ndev: Group master Netdev
* @dirty: Marked if the group needs synced to HW
* @offloaded: Marked if the group is currently offloaded to NIC
* @to_remove: Marked if the group should be removed from NIC
* @to_destroy: Marked if the group should be removed from driver
* @slave_cnt: Number of slaves in group
*/
struct nfp_fl_lag_group {
unsigned int group_id;
u8 group_inst;
struct list_head list;
struct net_device *master_ndev;
bool dirty;
bool offloaded;
bool to_remove;
bool to_destroy;
unsigned int slave_cnt;
};
#define NFP_FL_LAG_PKT_NUMBER_MASK GENMASK(30, 0)
#define NFP_FL_LAG_VERSION_MASK GENMASK(22, 0)
#define NFP_FL_LAG_HOST_TTL 0xff
/* Use this ID with zero members to ack a batch config */
#define NFP_FL_LAG_SYNC_ID 0
#define NFP_FL_LAG_GROUP_MIN 1 /* ID 0 reserved */
#define NFP_FL_LAG_GROUP_MAX 32 /* IDs 1 to 31 are valid */
/* wait for more config */
#define NFP_FL_LAG_DELAY (msecs_to_jiffies(2))
#define NFP_FL_LAG_RETRANS_LIMIT 100 /* max retrans cmsgs to store */
static unsigned int nfp_fl_get_next_pkt_number(struct nfp_fl_lag *lag)
{
lag->pkt_num++;
lag->pkt_num &= NFP_FL_LAG_PKT_NUMBER_MASK;
return lag->pkt_num;
}
static void nfp_fl_increment_version(struct nfp_fl_lag *lag)
{
/* LSB is not considered by firmware so add 2 for each increment. */
lag->batch_ver += 2;
lag->batch_ver &= NFP_FL_LAG_VERSION_MASK;
/* Zero is reserved by firmware. */
if (!lag->batch_ver)
lag->batch_ver += 2;
}
static struct nfp_fl_lag_group *
nfp_fl_lag_group_create(struct nfp_fl_lag *lag, struct net_device *master)
{
struct nfp_fl_lag_group *group;
struct nfp_flower_priv *priv;
int id;
priv = container_of(lag, struct nfp_flower_priv, nfp_lag);
id = ida_simple_get(&lag->ida_handle, NFP_FL_LAG_GROUP_MIN,
NFP_FL_LAG_GROUP_MAX, GFP_KERNEL);
if (id < 0) {
nfp_flower_cmsg_warn(priv->app,
"No more bonding groups available\n");
return ERR_PTR(id);
}
group = kmalloc(sizeof(*group), GFP_KERNEL);
if (!group) {
ida_simple_remove(&lag->ida_handle, id);
return ERR_PTR(-ENOMEM);
}
group->group_id = id;
group->master_ndev = master;
group->dirty = true;
group->offloaded = false;
group->to_remove = false;
group->to_destroy = false;
group->slave_cnt = 0;
group->group_inst = ++lag->global_inst;
list_add_tail(&group->list, &lag->group_list);
return group;
}
static struct nfp_fl_lag_group *
nfp_fl_lag_find_group_for_master_with_lag(struct nfp_fl_lag *lag,
struct net_device *master)
{
struct nfp_fl_lag_group *entry;
if (!master)
return NULL;
list_for_each_entry(entry, &lag->group_list, list)
if (entry->master_ndev == master)
return entry;
return NULL;
}
int nfp_flower_lag_populate_pre_action(struct nfp_app *app,
struct net_device *master,
struct nfp_fl_pre_lag *pre_act)
{
struct nfp_flower_priv *priv = app->priv;
struct nfp_fl_lag_group *group = NULL;
__be32 temp_vers;
mutex_lock(&priv->nfp_lag.lock);
group = nfp_fl_lag_find_group_for_master_with_lag(&priv->nfp_lag,
master);
if (!group) {
mutex_unlock(&priv->nfp_lag.lock);
return -ENOENT;
}
pre_act->group_id = cpu_to_be16(group->group_id);
temp_vers = cpu_to_be32(priv->nfp_lag.batch_ver <<
NFP_FL_PRE_LAG_VER_OFF);
memcpy(pre_act->lag_version, &temp_vers, 3);
pre_act->instance = group->group_inst;
mutex_unlock(&priv->nfp_lag.lock);
return 0;
}
int nfp_flower_lag_get_output_id(struct nfp_app *app, struct net_device *master)
{
struct nfp_flower_priv *priv = app->priv;
struct nfp_fl_lag_group *group = NULL;
int group_id = -ENOENT;
mutex_lock(&priv->nfp_lag.lock);
group = nfp_fl_lag_find_group_for_master_with_lag(&priv->nfp_lag,
master);
if (group)
group_id = group->group_id;
mutex_unlock(&priv->nfp_lag.lock);
return group_id;
}
static int
nfp_fl_lag_config_group(struct nfp_fl_lag *lag, struct nfp_fl_lag_group *group,
struct net_device **active_members,
unsigned int member_cnt, enum nfp_fl_lag_batch *batch)
{
struct nfp_flower_cmsg_lag_config *cmsg_payload;
struct nfp_flower_priv *priv;
unsigned long int flags;
unsigned int size, i;
struct sk_buff *skb;
priv = container_of(lag, struct nfp_flower_priv, nfp_lag);
size = sizeof(*cmsg_payload) + sizeof(__be32) * member_cnt;
skb = nfp_flower_cmsg_alloc(priv->app, size,
NFP_FLOWER_CMSG_TYPE_LAG_CONFIG,
GFP_KERNEL);
if (!skb)
return -ENOMEM;
cmsg_payload = nfp_flower_cmsg_get_data(skb);
flags = 0;
/* Increment batch version for each new batch of config messages. */
if (*batch == NFP_FL_LAG_BATCH_FIRST) {
flags |= NFP_FL_LAG_FIRST;
nfp_fl_increment_version(lag);
*batch = NFP_FL_LAG_BATCH_MEMBER;
}
/* If it is a reset msg then it is also the end of the batch. */
if (lag->rst_cfg) {
flags |= NFP_FL_LAG_RESET;
*batch = NFP_FL_LAG_BATCH_FINISHED;
}
/* To signal the end of a batch, both the switch and last flags are set
* and the the reserved SYNC group ID is used.
*/
if (*batch == NFP_FL_LAG_BATCH_FINISHED) {
flags |= NFP_FL_LAG_SWITCH | NFP_FL_LAG_LAST;
lag->rst_cfg = false;
cmsg_payload->group_id = cpu_to_be32(NFP_FL_LAG_SYNC_ID);
cmsg_payload->group_inst = 0;
} else {
cmsg_payload->group_id = cpu_to_be32(group->group_id);
cmsg_payload->group_inst = cpu_to_be32(group->group_inst);
}
cmsg_payload->reserved[0] = 0;
cmsg_payload->reserved[1] = 0;
cmsg_payload->ttl = NFP_FL_LAG_HOST_TTL;
cmsg_payload->ctrl_flags = flags;
cmsg_payload->batch_ver = cpu_to_be32(lag->batch_ver);
cmsg_payload->pkt_number = cpu_to_be32(nfp_fl_get_next_pkt_number(lag));
for (i = 0; i < member_cnt; i++)
cmsg_payload->members[i] =
cpu_to_be32(nfp_repr_get_port_id(active_members[i]));
nfp_ctrl_tx(priv->app->ctrl, skb);
return 0;
}
static void nfp_fl_lag_do_work(struct work_struct *work)
{
enum nfp_fl_lag_batch batch = NFP_FL_LAG_BATCH_FIRST;
struct nfp_fl_lag_group *entry, *storage;
struct delayed_work *delayed_work;
struct nfp_flower_priv *priv;
struct nfp_fl_lag *lag;
int err;
delayed_work = to_delayed_work(work);
lag = container_of(delayed_work, struct nfp_fl_lag, work);
priv = container_of(lag, struct nfp_flower_priv, nfp_lag);
mutex_lock(&lag->lock);
list_for_each_entry_safe(entry, storage, &lag->group_list, list) {
struct net_device *iter_netdev, **acti_netdevs;
struct nfp_flower_repr_priv *repr_priv;
int active_count = 0, slaves = 0;
struct nfp_repr *repr;
unsigned long *flags;
if (entry->to_remove) {
/* Active count of 0 deletes group on hw. */
err = nfp_fl_lag_config_group(lag, entry, NULL, 0,
&batch);
if (!err) {
entry->to_remove = false;
entry->offloaded = false;
} else {
nfp_flower_cmsg_warn(priv->app,
"group delete failed\n");
schedule_delayed_work(&lag->work,
NFP_FL_LAG_DELAY);
continue;
}
if (entry->to_destroy) {
ida_simple_remove(&lag->ida_handle,
entry->group_id);
list_del(&entry->list);
kfree(entry);
}
continue;
}
acti_netdevs = kmalloc_array(entry->slave_cnt,
sizeof(*acti_netdevs), GFP_KERNEL);
/* Include sanity check in the loop. It may be that a bond has
* changed between processing the last notification and the
* work queue triggering. If the number of slaves has changed
* or it now contains netdevs that cannot be offloaded, ignore
* the group until pending notifications are processed.
*/
rcu_read_lock();
for_each_netdev_in_bond_rcu(entry->master_ndev, iter_netdev) {
if (!nfp_netdev_is_nfp_repr(iter_netdev)) {
slaves = 0;
break;
}
repr = netdev_priv(iter_netdev);
if (repr->app != priv->app) {
slaves = 0;
break;
}
slaves++;
if (slaves > entry->slave_cnt)
break;
/* Check the ports for state changes. */
repr_priv = repr->app_priv;
flags = &repr_priv->lag_port_flags;
if (*flags & NFP_PORT_LAG_CHANGED) {
*flags &= ~NFP_PORT_LAG_CHANGED;
entry->dirty = true;
}
if ((*flags & NFP_PORT_LAG_TX_ENABLED) &&
(*flags & NFP_PORT_LAG_LINK_UP))
acti_netdevs[active_count++] = iter_netdev;
}
rcu_read_unlock();
if (slaves != entry->slave_cnt || !entry->dirty) {
kfree(acti_netdevs);
continue;
}
err = nfp_fl_lag_config_group(lag, entry, acti_netdevs,
active_count, &batch);
if (!err) {
entry->offloaded = true;
entry->dirty = false;
} else {
nfp_flower_cmsg_warn(priv->app,
"group offload failed\n");
schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
}
kfree(acti_netdevs);
}
/* End the config batch if at least one packet has been batched. */
if (batch == NFP_FL_LAG_BATCH_MEMBER) {
batch = NFP_FL_LAG_BATCH_FINISHED;
err = nfp_fl_lag_config_group(lag, NULL, NULL, 0, &batch);
if (err)
nfp_flower_cmsg_warn(priv->app,
"group batch end cmsg failed\n");
}
mutex_unlock(&lag->lock);
}
static int
nfp_fl_lag_put_unprocessed(struct nfp_fl_lag *lag, struct sk_buff *skb)
{
struct nfp_flower_cmsg_lag_config *cmsg_payload;
cmsg_payload = nfp_flower_cmsg_get_data(skb);
if (be32_to_cpu(cmsg_payload->group_id) >= NFP_FL_LAG_GROUP_MAX)
return -EINVAL;
/* Drop cmsg retrans if storage limit is exceeded to prevent
* overloading. If the fw notices that expected messages have not been
* received in a given time block, it will request a full resync.
*/
if (skb_queue_len(&lag->retrans_skbs) >= NFP_FL_LAG_RETRANS_LIMIT)
return -ENOSPC;
__skb_queue_tail(&lag->retrans_skbs, skb);
return 0;
}
static void nfp_fl_send_unprocessed(struct nfp_fl_lag *lag)
{
struct nfp_flower_priv *priv;
struct sk_buff *skb;
priv = container_of(lag, struct nfp_flower_priv, nfp_lag);
while ((skb = __skb_dequeue(&lag->retrans_skbs)))
nfp_ctrl_tx(priv->app->ctrl, skb);
}
bool nfp_flower_lag_unprocessed_msg(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_flower_cmsg_lag_config *cmsg_payload;
struct nfp_flower_priv *priv = app->priv;
struct nfp_fl_lag_group *group_entry;
unsigned long int flags;
bool store_skb = false;
int err;
cmsg_payload = nfp_flower_cmsg_get_data(skb);
flags = cmsg_payload->ctrl_flags;
/* Note the intentional fall through below. If DATA and XON are both
* set, the message will stored and sent again with the rest of the
* unprocessed messages list.
*/
/* Store */
if (flags & NFP_FL_LAG_DATA)
if (!nfp_fl_lag_put_unprocessed(&priv->nfp_lag, skb))
store_skb = true;
/* Send stored */
if (flags & NFP_FL_LAG_XON)
nfp_fl_send_unprocessed(&priv->nfp_lag);
/* Resend all */
if (flags & NFP_FL_LAG_SYNC) {
/* To resend all config:
* 1) Clear all unprocessed messages
* 2) Mark all groups dirty
* 3) Reset NFP group config
* 4) Schedule a LAG config update
*/
__skb_queue_purge(&priv->nfp_lag.retrans_skbs);
mutex_lock(&priv->nfp_lag.lock);
list_for_each_entry(group_entry, &priv->nfp_lag.group_list,
list)
group_entry->dirty = true;
err = nfp_flower_lag_reset(&priv->nfp_lag);
if (err)
nfp_flower_cmsg_warn(priv->app,
"mem err in group reset msg\n");
mutex_unlock(&priv->nfp_lag.lock);
schedule_delayed_work(&priv->nfp_lag.work, 0);
}
return store_skb;
}
static void
nfp_fl_lag_schedule_group_remove(struct nfp_fl_lag *lag,
struct nfp_fl_lag_group *group)
{
group->to_remove = true;
schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
}
static int
nfp_fl_lag_schedule_group_delete(struct nfp_fl_lag *lag,
struct net_device *master)
{
struct nfp_fl_lag_group *group;
mutex_lock(&lag->lock);
group = nfp_fl_lag_find_group_for_master_with_lag(lag, master);
if (!group) {
mutex_unlock(&lag->lock);
return -ENOENT;
}
group->to_remove = true;
group->to_destroy = true;
mutex_unlock(&lag->lock);
schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
return 0;
}
static int
nfp_fl_lag_changeupper_event(struct nfp_fl_lag *lag,
struct netdev_notifier_changeupper_info *info)
{
struct net_device *upper = info->upper_dev, *iter_netdev;
struct netdev_lag_upper_info *lag_upper_info;
struct nfp_fl_lag_group *group;
struct nfp_flower_priv *priv;
unsigned int slave_count = 0;
bool can_offload = true;
struct nfp_repr *repr;
if (!netif_is_lag_master(upper))
return 0;
priv = container_of(lag, struct nfp_flower_priv, nfp_lag);
rcu_read_lock();
for_each_netdev_in_bond_rcu(upper, iter_netdev) {
if (!nfp_netdev_is_nfp_repr(iter_netdev)) {
can_offload = false;
break;
}
repr = netdev_priv(iter_netdev);
/* Ensure all ports are created by the same app/on same card. */
if (repr->app != priv->app) {
can_offload = false;
break;
}
slave_count++;
}
rcu_read_unlock();
lag_upper_info = info->upper_info;
/* Firmware supports active/backup and L3/L4 hash bonds. */
if (lag_upper_info &&
lag_upper_info->tx_type != NETDEV_LAG_TX_TYPE_ACTIVEBACKUP &&
(lag_upper_info->tx_type != NETDEV_LAG_TX_TYPE_HASH ||
(lag_upper_info->hash_type != NETDEV_LAG_HASH_L34 &&
lag_upper_info->hash_type != NETDEV_LAG_HASH_E34 &&
lag_upper_info->hash_type != NETDEV_LAG_HASH_UNKNOWN))) {
can_offload = false;
nfp_flower_cmsg_warn(priv->app,
"Unable to offload tx_type %u hash %u\n",
lag_upper_info->tx_type,
lag_upper_info->hash_type);
}
mutex_lock(&lag->lock);
group = nfp_fl_lag_find_group_for_master_with_lag(lag, upper);
if (slave_count == 0 || !can_offload) {
/* Cannot offload the group - remove if previously offloaded. */
if (group && group->offloaded)
nfp_fl_lag_schedule_group_remove(lag, group);
mutex_unlock(&lag->lock);
return 0;
}
if (!group) {
group = nfp_fl_lag_group_create(lag, upper);
if (IS_ERR(group)) {
mutex_unlock(&lag->lock);
return PTR_ERR(group);
}
}
group->dirty = true;
group->slave_cnt = slave_count;
/* Group may have been on queue for removal but is now offfloable. */
group->to_remove = false;
mutex_unlock(&lag->lock);
schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
return 0;
}
static int
nfp_fl_lag_changels_event(struct nfp_fl_lag *lag, struct net_device *netdev,
struct netdev_notifier_changelowerstate_info *info)
{
struct netdev_lag_lower_state_info *lag_lower_info;
struct nfp_flower_repr_priv *repr_priv;
struct nfp_flower_priv *priv;
struct nfp_repr *repr;
unsigned long *flags;
if (!netif_is_lag_port(netdev) || !nfp_netdev_is_nfp_repr(netdev))
return 0;
lag_lower_info = info->lower_state_info;
if (!lag_lower_info)
return 0;
priv = container_of(lag, struct nfp_flower_priv, nfp_lag);
repr = netdev_priv(netdev);
/* Verify that the repr is associated with this app. */
if (repr->app != priv->app)
return 0;
repr_priv = repr->app_priv;
flags = &repr_priv->lag_port_flags;
mutex_lock(&lag->lock);
if (lag_lower_info->link_up)
*flags |= NFP_PORT_LAG_LINK_UP;
else
*flags &= ~NFP_PORT_LAG_LINK_UP;
if (lag_lower_info->tx_enabled)
*flags |= NFP_PORT_LAG_TX_ENABLED;
else
*flags &= ~NFP_PORT_LAG_TX_ENABLED;
*flags |= NFP_PORT_LAG_CHANGED;
mutex_unlock(&lag->lock);
schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
return 0;
}
static int
nfp_fl_lag_netdev_event(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct net_device *netdev;
struct nfp_fl_lag *lag;
int err;
netdev = netdev_notifier_info_to_dev(ptr);
lag = container_of(nb, struct nfp_fl_lag, lag_nb);
switch (event) {
case NETDEV_CHANGEUPPER:
err = nfp_fl_lag_changeupper_event(lag, ptr);
if (err)
return NOTIFY_BAD;
return NOTIFY_OK;
case NETDEV_CHANGELOWERSTATE:
err = nfp_fl_lag_changels_event(lag, netdev, ptr);
if (err)
return NOTIFY_BAD;
return NOTIFY_OK;
case NETDEV_UNREGISTER:
if (netif_is_bond_master(netdev)) {
err = nfp_fl_lag_schedule_group_delete(lag, netdev);
if (err)
return NOTIFY_BAD;
return NOTIFY_OK;
}
}
return NOTIFY_DONE;
}
int nfp_flower_lag_reset(struct nfp_fl_lag *lag)
{
enum nfp_fl_lag_batch batch = NFP_FL_LAG_BATCH_FIRST;
lag->rst_cfg = true;
return nfp_fl_lag_config_group(lag, NULL, NULL, 0, &batch);
}
void nfp_flower_lag_init(struct nfp_fl_lag *lag)
{
INIT_DELAYED_WORK(&lag->work, nfp_fl_lag_do_work);
INIT_LIST_HEAD(&lag->group_list);
mutex_init(&lag->lock);
ida_init(&lag->ida_handle);
__skb_queue_head_init(&lag->retrans_skbs);
/* 0 is a reserved batch version so increment to first valid value. */
nfp_fl_increment_version(lag);
lag->lag_nb.notifier_call = nfp_fl_lag_netdev_event;
}
void nfp_flower_lag_cleanup(struct nfp_fl_lag *lag)
{
struct nfp_fl_lag_group *entry, *storage;
cancel_delayed_work_sync(&lag->work);
__skb_queue_purge(&lag->retrans_skbs);
/* Remove all groups. */
mutex_lock(&lag->lock);
list_for_each_entry_safe(entry, storage, &lag->group_list, list) {
list_del(&entry->list);
kfree(entry);
}
mutex_unlock(&lag->lock);
mutex_destroy(&lag->lock);
ida_destroy(&lag->ida_handle);
}
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