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netfilter: flowtable: Make nf_flow_table_offload_add/del_cb inline

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Currently, nf_flow_table_offload_add/del_cb are exported by nf_flow_table
module, therefore modules using them will have hard-dependency
on nf_flow_table and will require loading it all the time.

This can lead to an unnecessary overhead on systems that do not
use this API.

To relax the hard-dependency between the modules, we unexport these
functions and make them static inline.

Fixes: 978703f425 ("netfilter: flowtable: Add API for registering to flow table events")
Signed-off-by: Alaa Hleihel <alaa@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alaa Hleihel 2020-06-14 14:12:49 +03:00 committed by David S. Miller
parent 762f926d6f
commit 505ee3a1ca
2 changed files with 45 additions and 49 deletions
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49
include/net/netfilter/nf_flow_table.h
View File

@ -161,10 +161,51 @@ struct nf_flow_route {
struct flow_offload *flow_offload_alloc(struct nf_conn *ct);
void flow_offload_free(struct flow_offload *flow);
int nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv);
void nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv);
static inline int
nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
{
struct flow_block *block = &flow_table->flow_block;
struct flow_block_cb *block_cb;
int err = 0;
down_write(&flow_table->flow_block_lock);
block_cb = flow_block_cb_lookup(block, cb, cb_priv);
if (block_cb) {
err = -EEXIST;
goto unlock;
}
block_cb = flow_block_cb_alloc(cb, cb_priv, cb_priv, NULL);
if (IS_ERR(block_cb)) {
err = PTR_ERR(block_cb);
goto unlock;
}
list_add_tail(&block_cb->list, &block->cb_list);
unlock:
up_write(&flow_table->flow_block_lock);
return err;
}
static inline void
nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
{
struct flow_block *block = &flow_table->flow_block;
struct flow_block_cb *block_cb;
down_write(&flow_table->flow_block_lock);
block_cb = flow_block_cb_lookup(block, cb, cb_priv);
if (block_cb) {
list_del(&block_cb->list);
flow_block_cb_free(block_cb);
} else {
WARN_ON(true);
}
up_write(&flow_table->flow_block_lock);
}
int flow_offload_route_init(struct flow_offload *flow,
const struct nf_flow_route *route);

45
net/netfilter/nf_flow_table_core.c
View File

@ -387,51 +387,6 @@ static void nf_flow_offload_work_gc(struct work_struct *work)
queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ);
}
int nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
{
struct flow_block *block = &flow_table->flow_block;
struct flow_block_cb *block_cb;
int err = 0;
down_write(&flow_table->flow_block_lock);
block_cb = flow_block_cb_lookup(block, cb, cb_priv);
if (block_cb) {
err = -EEXIST;
goto unlock;
}
block_cb = flow_block_cb_alloc(cb, cb_priv, cb_priv, NULL);
if (IS_ERR(block_cb)) {
err = PTR_ERR(block_cb);
goto unlock;
}
list_add_tail(&block_cb->list, &block->cb_list);
unlock:
up_write(&flow_table->flow_block_lock);
return err;
}
EXPORT_SYMBOL_GPL(nf_flow_table_offload_add_cb);
void nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
{
struct flow_block *block = &flow_table->flow_block;
struct flow_block_cb *block_cb;
down_write(&flow_table->flow_block_lock);
block_cb = flow_block_cb_lookup(block, cb, cb_priv);
if (block_cb) {
list_del(&block_cb->list);
flow_block_cb_free(block_cb);
} else {
WARN_ON(true);
}
up_write(&flow_table->flow_block_lock);
}
EXPORT_SYMBOL_GPL(nf_flow_table_offload_del_cb);
static int nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff,
__be16 port, __be16 new_port)