Commit 4e6cbfd0 authored by John W. Linville's avatar John W. Linville
Browse files

mac80211: support use of NAPI for bottom-half processing 



This patch implement basic infrastructure to support use of NAPI by
mac80211-based hardware drivers.

Because mac80211 devices can support multiple netdevs, a dummy netdev
is used for interfacing with the NAPI code in the core of the network
stack.  That structure is hidden from the hardware drivers, but the
actual napi_struct is exposed in the ieee80211_hw structure so that the
poll routines in drivers can retrieve that structure.  Hardware drivers
can also specify their own weight value for NAPI polling.

Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 68e887ef

include/net/mac80211.h

+24 −0
Original line number Diff line number Diff line
@@ -1102,6 +1102,10 @@ enum ieee80211_hw_flags { 
 *

 * @max_rates: maximum number of alternate rate retry stages

 * @max_rate_tries: maximum number of tries for each stage

 *

 * @napi_weight: weight used for NAPI polling.  You must specify an

 *	appropriate value here if a napi_poll operation is provided

 *	by your driver.

 */

struct ieee80211_hw {

	struct ieee80211_conf conf;
@@ -1113,6 +1117,7 @@ struct ieee80211_hw { 
	int channel_change_time;

	int vif_data_size;

	int sta_data_size;

	int napi_weight;

	u16 queues;

	u16 max_listen_interval;

	s8 max_signal;
@@ -1687,6 +1692,8 @@ enum ieee80211_ampdu_mlme_action { 
 *	switch operation for CSAs received from the AP may implement this

 *	callback. They must then call ieee80211_chswitch_done() to indicate

 *	completion of the channel switch.

 *

 * @napi_poll: Poll Rx queue for incoming data frames.

 */

struct ieee80211_ops {

	int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
@@ -1752,6 +1759,7 @@ struct ieee80211_ops { 
	void (*flush)(struct ieee80211_hw *hw, bool drop);

	void (*channel_switch)(struct ieee80211_hw *hw,

			       struct ieee80211_channel_switch *ch_switch);

	int (*napi_poll)(struct ieee80211_hw *hw, int budget);

};



/**
@@ -1897,6 +1905,22 @@ void ieee80211_free_hw(struct ieee80211_hw *hw); 
 */

void ieee80211_restart_hw(struct ieee80211_hw *hw);



/** ieee80211_napi_schedule - schedule NAPI poll

 *

 * Use this function to schedule NAPI polling on a device.

 *

 * @hw: the hardware to start polling

 */

void ieee80211_napi_schedule(struct ieee80211_hw *hw);



/** ieee80211_napi_complete - complete NAPI polling

 *

 * Use this function to finish NAPI polling on a device.

 *

 * @hw: the hardware to stop polling

 */

void ieee80211_napi_complete(struct ieee80211_hw *hw);



/**

 * ieee80211_rx - receive frame

 *

net/mac80211/ieee80211_i.h

+5 −0
Original line number Diff line number Diff line
@@ -870,6 +870,11 @@ struct ieee80211_local { 
		struct dentry *keys;

	} debugfs;

#endif



	/* dummy netdev for use w/ NAPI */

	struct net_device napi_dev;



	struct napi_struct napi;

};



static inline struct ieee80211_sub_if_data *

net/mac80211/iface.c

+4 −0
Original line number Diff line number Diff line
@@ -187,6 +187,8 @@ static int ieee80211_open(struct net_device *dev) 
		res = drv_start(local);

		if (res)

			goto err_del_bss;

		if (local->ops->napi_poll)

			napi_enable(&local->napi);

		/* we're brought up, everything changes */

		hw_reconf_flags = ~0;

		ieee80211_led_radio(local, true);
@@ -519,6 +521,8 @@ static int ieee80211_stop(struct net_device *dev) 
	ieee80211_recalc_ps(local, -1);



	if (local->open_count == 0) {

		if (local->ops->napi_poll)

			napi_disable(&local->napi);

		ieee80211_clear_tx_pending(local);

		ieee80211_stop_device(local);

net/mac80211/main.c

+30 −0
Original line number Diff line number Diff line
@@ -390,6 +390,30 @@ static int ieee80211_ifa_changed(struct notifier_block *nb, 
}

#endif



static int ieee80211_napi_poll(struct napi_struct *napi, int budget)

{

	struct ieee80211_local *local =

		container_of(napi, struct ieee80211_local, napi);



	return local->ops->napi_poll(&local->hw, budget);

}



void ieee80211_napi_schedule(struct ieee80211_hw *hw)

{

	struct ieee80211_local *local = hw_to_local(hw);



	napi_schedule(&local->napi);

}

EXPORT_SYMBOL(ieee80211_napi_schedule);



void ieee80211_napi_complete(struct ieee80211_hw *hw)

{

	struct ieee80211_local *local = hw_to_local(hw);



	napi_complete(&local->napi);

}

EXPORT_SYMBOL(ieee80211_napi_complete);



struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,

					const struct ieee80211_ops *ops)

{
@@ -494,6 +518,9 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 
	skb_queue_head_init(&local->skb_queue);

	skb_queue_head_init(&local->skb_queue_unreliable);



	/* init dummy netdev for use w/ NAPI */

	init_dummy_netdev(&local->napi_dev);



	return local_to_hw(local);

}

EXPORT_SYMBOL(ieee80211_alloc_hw);
@@ -683,6 +710,9 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) 
		goto fail_ifa;

#endif



	netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,

			local->hw.napi_weight);



	return 0;



#ifdef CONFIG_INET

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