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mac80211: support use of NAPI for bottom-half processing

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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: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
John W. Linville
2010-07-29 16:14:13 -04:00
parent 68e887ef21
commit 4e6cbfd09c
4 changed files with 63 additions and 0 deletions
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24
include/net/mac80211.h
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@@ -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
*