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net: sched: register callbacks for indirect tc block binds

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Currently drivers can register to receive TC block bind/unbind callbacks
by implementing the setup_tc ndo in any of their given netdevs. However,
drivers may also be interested in binds to higher level devices (e.g.
tunnel drivers) to potentially offload filters applied to them.

Introduce indirect block devs which allows drivers to register callbacks
for block binds on other devices. The callback is triggered when the
device is bound to a block, allowing the driver to register for rules
applied to that block using already available functions.

Freeing an indirect block callback will trigger an unbind event (if
necessary) to direct the driver to remove any offloaded rules and unreg
any block rule callbacks. It is the responsibility of the implementing
driver to clean any registered indirect block callbacks before exiting,
if the block it still active at such a time.

Allow registering an indirect block dev callback for a device that is
already bound to a block. In this case (if it is an ingress block),
register and also trigger the callback meaning that any already installed
rules can be replayed to the calling driver.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Hurley
2018-11-09 21:21:26 -08:00
committed by David S. Miller
parent d1ce01144e
commit 7f76fa3675
3 changed files with 292 additions and 1 deletions
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34
include/net/pkt_cls.h
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@@ -81,6 +81,14 @@ void __tcf_block_cb_unregister(struct tcf_block *block,
struct tcf_block_cb *block_cb);
void tcf_block_cb_unregister(struct tcf_block *block,
tc_setup_cb_t *cb, void *cb_ident);
int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
tc_indr_block_bind_cb_t *cb, void *cb_ident);
int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
tc_indr_block_bind_cb_t *cb, void *cb_ident);
void __tc_indr_block_cb_unregister(struct net_device *dev,
tc_indr_block_bind_cb_t *cb, void *cb_ident);
void tc_indr_block_cb_unregister(struct net_device *dev,
tc_indr_block_bind_cb_t *cb, void *cb_ident);
int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res, bool compat_mode);
@@ -183,6 +191,32 @@ void tcf_block_cb_unregister(struct tcf_block *block,
{
}
static inline
int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
tc_indr_block_bind_cb_t *cb, void *cb_ident)
{
return 0;
}
static inline
int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
tc_indr_block_bind_cb_t *cb, void *cb_ident)
{
return 0;
}
static inline
void __tc_indr_block_cb_unregister(struct net_device *dev,
tc_indr_block_bind_cb_t *cb, void *cb_ident)
{
}
static inline
void tc_indr_block_cb_unregister(struct net_device *dev,
tc_indr_block_bind_cb_t *cb, void *cb_ident)
{
}
static inline int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res, bool compat_mode)
{