diff options
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/flow_offload.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c index e64941c526b1..8cd7da2586ae 100644 --- a/net/core/flow_offload.c +++ b/net/core/flow_offload.c @@ -317,6 +317,163 @@ int flow_block_cb_setup_simple(struct flow_block_offload *f, } EXPORT_SYMBOL(flow_block_cb_setup_simple); +static DEFINE_MUTEX(flow_indr_block_lock); +static LIST_HEAD(flow_block_indr_list); +static LIST_HEAD(flow_block_indr_dev_list); + +struct flow_indr_dev { + struct list_head list; + flow_indr_block_bind_cb_t *cb; + void *cb_priv; + refcount_t refcnt; + struct rcu_head rcu; +}; + +static struct flow_indr_dev *flow_indr_dev_alloc(flow_indr_block_bind_cb_t *cb, + void *cb_priv) +{ + struct flow_indr_dev *indr_dev; + + indr_dev = kmalloc(sizeof(*indr_dev), GFP_KERNEL); + if (!indr_dev) + return NULL; + + indr_dev->cb = cb; + indr_dev->cb_priv = cb_priv; + refcount_set(&indr_dev->refcnt, 1); + + return indr_dev; +} + +int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv) +{ + struct flow_indr_dev *indr_dev; + + mutex_lock(&flow_indr_block_lock); + list_for_each_entry(indr_dev, &flow_block_indr_dev_list, list) { + if (indr_dev->cb == cb && + indr_dev->cb_priv == cb_priv) { + refcount_inc(&indr_dev->refcnt); + mutex_unlock(&flow_indr_block_lock); + return 0; + } + } + + indr_dev = flow_indr_dev_alloc(cb, cb_priv); + if (!indr_dev) { + mutex_unlock(&flow_indr_block_lock); + return -ENOMEM; + } + + list_add(&indr_dev->list, &flow_block_indr_dev_list); + mutex_unlock(&flow_indr_block_lock); + + return 0; +} +EXPORT_SYMBOL(flow_indr_dev_register); + +static void __flow_block_indr_cleanup(flow_setup_cb_t *setup_cb, void *cb_priv, + struct list_head *cleanup_list) +{ + struct flow_block_cb *this, *next; + + list_for_each_entry_safe(this, next, &flow_block_indr_list, indr.list) { + if (this->cb == setup_cb && + this->cb_priv == cb_priv) { + list_move(&this->indr.list, cleanup_list); + return; + } + } +} + +static void flow_block_indr_notify(struct list_head *cleanup_list) +{ + struct flow_block_cb *this, *next; + + list_for_each_entry_safe(this, next, cleanup_list, indr.list) { + list_del(&this->indr.list); + this->indr.cleanup(this); + } +} + +void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv, + flow_setup_cb_t *setup_cb) +{ + struct flow_indr_dev *this, *next, *indr_dev = NULL; + LIST_HEAD(cleanup_list); + + mutex_lock(&flow_indr_block_lock); + list_for_each_entry_safe(this, next, &flow_block_indr_dev_list, list) { + if (this->cb == cb && + this->cb_priv == cb_priv && + refcount_dec_and_test(&this->refcnt)) { + indr_dev = this; + list_del(&indr_dev->list); + break; + } + } + + if (!indr_dev) { + mutex_unlock(&flow_indr_block_lock); + return; + } + + __flow_block_indr_cleanup(setup_cb, cb_priv, &cleanup_list); + mutex_unlock(&flow_indr_block_lock); + + flow_block_indr_notify(&cleanup_list); + kfree(indr_dev); +} +EXPORT_SYMBOL(flow_indr_dev_unregister); + +static void flow_block_indr_init(struct flow_block_cb *flow_block, + struct flow_block_offload *bo, + struct net_device *dev, void *data, + void (*cleanup)(struct flow_block_cb *block_cb)) +{ + flow_block->indr.binder_type = bo->binder_type; + flow_block->indr.data = data; + flow_block->indr.dev = dev; + flow_block->indr.cleanup = cleanup; +} + +static void __flow_block_indr_binding(struct flow_block_offload *bo, + struct net_device *dev, void *data, + void (*cleanup)(struct flow_block_cb *block_cb)) +{ + struct flow_block_cb *block_cb; + + list_for_each_entry(block_cb, &bo->cb_list, list) { + switch (bo->command) { + case FLOW_BLOCK_BIND: + flow_block_indr_init(block_cb, bo, dev, data, cleanup); + list_add(&block_cb->indr.list, &flow_block_indr_list); + break; + case FLOW_BLOCK_UNBIND: + list_del(&block_cb->indr.list); + break; + } + } +} + +int flow_indr_dev_setup_offload(struct net_device *dev, + enum tc_setup_type type, void *data, + struct flow_block_offload *bo, + void (*cleanup)(struct flow_block_cb *block_cb)) +{ + struct flow_indr_dev *this; + + mutex_lock(&flow_indr_block_lock); + list_for_each_entry(this, &flow_block_indr_dev_list, list) + this->cb(dev, this->cb_priv, type, bo); + + __flow_block_indr_binding(bo, dev, data, cleanup); + mutex_unlock(&flow_indr_block_lock); + + 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; |