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net: remove indirect block netdev event registration
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Drivers do not register to netdev events to set up indirect blocks
anymore. Remove __flow_indr_block_cb_register() and
__flow_indr_block_cb_unregister().

The frontends set up the callbacks through flow_indr_dev_setup_block()

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ummakynes @davem330
ummakynes authored and davem330 committed Jun 1, 2020
1 parent e445e30 commit 709ffbe
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Showing 5 changed files with 1 addition and 444 deletions.
9 changes: 0 additions & 9 deletions include/net/flow_offload.h
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Original file line number Diff line number Diff line change
Expand Up @@ -546,15 +546,6 @@ typedef void flow_indr_block_cmd_t(struct net_device *dev,
flow_indr_block_bind_cb_t *cb, void *cb_priv,
enum flow_block_command command);

struct flow_indr_block_entry {
flow_indr_block_cmd_t *cb;
struct list_head list;
};

void flow_indr_add_block_cb(struct flow_indr_block_entry *entry);

void flow_indr_del_block_cb(struct flow_indr_block_entry *entry);

int __flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
flow_indr_block_bind_cb_t *cb,
void *cb_ident);
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238 changes: 0 additions & 238 deletions net/core/flow_offload.c
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Original file line number Diff line number Diff line change
Expand Up @@ -473,241 +473,3 @@ int flow_indr_dev_setup_offload(struct net_device *dev,
return list_empty(&bo->cb_list) ? -EOPNOTSUPP : 0;
}
EXPORT_SYMBOL(flow_indr_dev_setup_offload);

static LIST_HEAD(block_cb_list);

static struct rhashtable indr_setup_block_ht;

struct flow_indr_block_cb {
struct list_head list;
void *cb_priv;
flow_indr_block_bind_cb_t *cb;
void *cb_ident;
};

struct flow_indr_block_dev {
struct rhash_head ht_node;
struct net_device *dev;
unsigned int refcnt;
struct list_head cb_list;
};

static const struct rhashtable_params flow_indr_setup_block_ht_params = {
.key_offset = offsetof(struct flow_indr_block_dev, dev),
.head_offset = offsetof(struct flow_indr_block_dev, ht_node),
.key_len = sizeof(struct net_device *),
};

static struct flow_indr_block_dev *
flow_indr_block_dev_lookup(struct net_device *dev)
{
return rhashtable_lookup_fast(&indr_setup_block_ht, &dev,
flow_indr_setup_block_ht_params);
}

static struct flow_indr_block_dev *
flow_indr_block_dev_get(struct net_device *dev)
{
struct flow_indr_block_dev *indr_dev;

indr_dev = flow_indr_block_dev_lookup(dev);
if (indr_dev)
goto inc_ref;

indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL);
if (!indr_dev)
return NULL;

INIT_LIST_HEAD(&indr_dev->cb_list);
indr_dev->dev = dev;
if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node,
flow_indr_setup_block_ht_params)) {
kfree(indr_dev);
return NULL;
}

inc_ref:
indr_dev->refcnt++;
return indr_dev;
}

static void flow_indr_block_dev_put(struct flow_indr_block_dev *indr_dev)
{
if (--indr_dev->refcnt)
return;

rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node,
flow_indr_setup_block_ht_params);
kfree(indr_dev);
}

static struct flow_indr_block_cb *
flow_indr_block_cb_lookup(struct flow_indr_block_dev *indr_dev,
flow_indr_block_bind_cb_t *cb, void *cb_ident)
{
struct flow_indr_block_cb *indr_block_cb;

list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
if (indr_block_cb->cb == cb &&
indr_block_cb->cb_ident == cb_ident)
return indr_block_cb;
return NULL;
}

static struct flow_indr_block_cb *
flow_indr_block_cb_add(struct flow_indr_block_dev *indr_dev, void *cb_priv,
flow_indr_block_bind_cb_t *cb, void *cb_ident)
{
struct flow_indr_block_cb *indr_block_cb;

indr_block_cb = flow_indr_block_cb_lookup(indr_dev, cb, cb_ident);
if (indr_block_cb)
return ERR_PTR(-EEXIST);

indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL);
if (!indr_block_cb)
return ERR_PTR(-ENOMEM);

indr_block_cb->cb_priv = cb_priv;
indr_block_cb->cb = cb;
indr_block_cb->cb_ident = cb_ident;
list_add(&indr_block_cb->list, &indr_dev->cb_list);

return indr_block_cb;
}

static void flow_indr_block_cb_del(struct flow_indr_block_cb *indr_block_cb)
{
list_del(&indr_block_cb->list);
kfree(indr_block_cb);
}

static DEFINE_MUTEX(flow_indr_block_cb_lock);

static void flow_block_cmd(struct net_device *dev,
flow_indr_block_bind_cb_t *cb, void *cb_priv,
enum flow_block_command command)
{
struct flow_indr_block_entry *entry;

mutex_lock(&flow_indr_block_cb_lock);
list_for_each_entry(entry, &block_cb_list, list) {
entry->cb(dev, cb, cb_priv, command);
}
mutex_unlock(&flow_indr_block_cb_lock);
}

int __flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
flow_indr_block_bind_cb_t *cb,
void *cb_ident)
{
struct flow_indr_block_cb *indr_block_cb;
struct flow_indr_block_dev *indr_dev;
int err;

indr_dev = flow_indr_block_dev_get(dev);
if (!indr_dev)
return -ENOMEM;

indr_block_cb = flow_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident);
err = PTR_ERR_OR_ZERO(indr_block_cb);
if (err)
goto err_dev_put;

flow_block_cmd(dev, indr_block_cb->cb, indr_block_cb->cb_priv,
FLOW_BLOCK_BIND);

return 0;

err_dev_put:
flow_indr_block_dev_put(indr_dev);
return err;
}
EXPORT_SYMBOL_GPL(__flow_indr_block_cb_register);

int flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
flow_indr_block_bind_cb_t *cb,
void *cb_ident)
{
int err;

rtnl_lock();
err = __flow_indr_block_cb_register(dev, cb_priv, cb, cb_ident);
rtnl_unlock();

return err;
}
EXPORT_SYMBOL_GPL(flow_indr_block_cb_register);

void __flow_indr_block_cb_unregister(struct net_device *dev,
flow_indr_block_bind_cb_t *cb,
void *cb_ident)
{
struct flow_indr_block_cb *indr_block_cb;
struct flow_indr_block_dev *indr_dev;

indr_dev = flow_indr_block_dev_lookup(dev);
if (!indr_dev)
return;

indr_block_cb = flow_indr_block_cb_lookup(indr_dev, cb, cb_ident);
if (!indr_block_cb)
return;

flow_block_cmd(dev, indr_block_cb->cb, indr_block_cb->cb_priv,
FLOW_BLOCK_UNBIND);

flow_indr_block_cb_del(indr_block_cb);
flow_indr_block_dev_put(indr_dev);
}
EXPORT_SYMBOL_GPL(__flow_indr_block_cb_unregister);

void flow_indr_block_cb_unregister(struct net_device *dev,
flow_indr_block_bind_cb_t *cb,
void *cb_ident)
{
rtnl_lock();
__flow_indr_block_cb_unregister(dev, cb, cb_ident);
rtnl_unlock();
}
EXPORT_SYMBOL_GPL(flow_indr_block_cb_unregister);

void flow_indr_block_call(struct net_device *dev,
struct flow_block_offload *bo,
enum flow_block_command command,
enum tc_setup_type type)
{
struct flow_indr_block_cb *indr_block_cb;
struct flow_indr_block_dev *indr_dev;

indr_dev = flow_indr_block_dev_lookup(dev);
if (!indr_dev)
return;

list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
indr_block_cb->cb(dev, indr_block_cb->cb_priv, type, bo);
}
EXPORT_SYMBOL_GPL(flow_indr_block_call);

void flow_indr_add_block_cb(struct flow_indr_block_entry *entry)
{
mutex_lock(&flow_indr_block_cb_lock);
list_add_tail(&entry->list, &block_cb_list);
mutex_unlock(&flow_indr_block_cb_lock);
}
EXPORT_SYMBOL_GPL(flow_indr_add_block_cb);

void flow_indr_del_block_cb(struct flow_indr_block_entry *entry)
{
mutex_lock(&flow_indr_block_cb_lock);
list_del(&entry->list);
mutex_unlock(&flow_indr_block_cb_lock);
}
EXPORT_SYMBOL_GPL(flow_indr_del_block_cb);

static int __init init_flow_indr_rhashtable(void)
{
return rhashtable_init(&indr_setup_block_ht,
&flow_indr_setup_block_ht_params);
}
subsys_initcall(init_flow_indr_rhashtable);
66 changes: 0 additions & 66 deletions net/netfilter/nf_flow_table_offload.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1008,83 +1008,17 @@ int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
}
EXPORT_SYMBOL_GPL(nf_flow_table_offload_setup);

static void nf_flow_table_indr_block_ing_cmd(struct net_device *dev,
struct nf_flowtable *flowtable,
flow_indr_block_bind_cb_t *cb,
void *cb_priv,
enum flow_block_command cmd)
{
struct netlink_ext_ack extack = {};
struct flow_block_offload bo;

if (!flowtable)
return;

nf_flow_table_block_offload_init(&bo, dev_net(dev), cmd, flowtable,
&extack);

cb(dev, cb_priv, TC_SETUP_FT, &bo);

nf_flow_table_block_setup(flowtable, &bo, cmd);
}

static void nf_flow_table_indr_block_cb_cmd(struct nf_flowtable *flowtable,
struct net_device *dev,
flow_indr_block_bind_cb_t *cb,
void *cb_priv,
enum flow_block_command cmd)
{
if (!(flowtable->flags & NF_FLOWTABLE_HW_OFFLOAD))
return;

nf_flow_table_indr_block_ing_cmd(dev, flowtable, cb, cb_priv, cmd);
}

static void nf_flow_table_indr_block_cb(struct net_device *dev,
flow_indr_block_bind_cb_t *cb,
void *cb_priv,
enum flow_block_command cmd)
{
struct net *net = dev_net(dev);
struct nft_flowtable *nft_ft;
struct nft_table *table;
struct nft_hook *hook;

mutex_lock(&net->nft.commit_mutex);
list_for_each_entry(table, &net->nft.tables, list) {
list_for_each_entry(nft_ft, &table->flowtables, list) {
list_for_each_entry(hook, &nft_ft->hook_list, list) {
if (hook->ops.dev != dev)
continue;

nf_flow_table_indr_block_cb_cmd(&nft_ft->data,
dev, cb,
cb_priv, cmd);
}
}
}
mutex_unlock(&net->nft.commit_mutex);
}

static struct flow_indr_block_entry block_ing_entry = {
.cb = nf_flow_table_indr_block_cb,
.list = LIST_HEAD_INIT(block_ing_entry.list),
};

int nf_flow_table_offload_init(void)
{
nf_flow_offload_wq = alloc_workqueue("nf_flow_table_offload",
WQ_UNBOUND, 0);
if (!nf_flow_offload_wq)
return -ENOMEM;

flow_indr_add_block_cb(&block_ing_entry);

return 0;
}

void nf_flow_table_offload_exit(void)
{
flow_indr_del_block_cb(&block_ing_entry);
destroy_workqueue(nf_flow_offload_wq);
}
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