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cfg80211: add support for flushing old scan results

Browse source 
Add an NL80211_SCAN_FLAG_FLUSH flag that causes old bss cache
entries to be flushed on scan completion. This is useful for
collecting guaranteed fresh scan/survey result (e.g. on resume).

For normal scan, flushing only happens on successful completion
of a scan; i.e. it does not happen if the scan is aborted.
For scheduled scan, previous scan results are flushed everytime
when we get new scan results.

This feature is enabled by default. Drivers can disable it by
unsetting the NL80211_FEATURE_SCAN_FLUSH flag.

Signed-off-by: Sam Leffler <[email protected]>
Tested-by: Amitkumar Karwar <[email protected]>
Signed-off-by: Amitkumar Karwar <[email protected]>
Signed-off-by: Bing Zhao <[email protected]>
[invert polarity of feature flag to account for old kernels]
Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Sam Leffler 2012-10-11 21:03:34 -07:00 • committed by Johannes Berg
commit 15d6030b4b
6 changed files with 66 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

2
net/wireless/core.c
View file

@ -370,6 +370,8 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
rdev->wiphy.rts_threshold = (u32) -1;
rdev->wiphy.coverage_class = 0;
rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
return &rdev->wiphy;
}
EXPORT_SYMBOL(wiphy_new);

14
net/wireless/nl80211.c
View file

@ -4371,8 +4371,10 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
if (info->attrs[NL80211_ATTR_SCAN_FLAGS]) {
request->flags = nla_get_u32(
info->attrs[NL80211_ATTR_SCAN_FLAGS]);
if ((request->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
!(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) {
if (((request->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
!(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) ||
((request->flags & NL80211_SCAN_FLAG_FLUSH) &&
!(wiphy->features & NL80211_FEATURE_SCAN_FLUSH))) {
err = -EOPNOTSUPP;
goto out_free;
}
@ -4383,6 +4385,7 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
request->wdev = wdev;
request->wiphy = &rdev->wiphy;
request->scan_start = jiffies;
rdev->scan_req = request;
err = rdev->ops->scan(&rdev->wiphy, request);
@ -4612,8 +4615,10 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
if (info->attrs[NL80211_ATTR_SCAN_FLAGS]) {
request->flags = nla_get_u32(
info->attrs[NL80211_ATTR_SCAN_FLAGS]);
if ((request->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
!(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) {
if (((request->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
!(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) ||
((request->flags & NL80211_SCAN_FLAG_FLUSH) &&
!(wiphy->features & NL80211_FEATURE_SCAN_FLUSH))) {
err = -EOPNOTSUPP;
goto out_free;
}
@ -4622,6 +4627,7 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
request->dev = dev;
request->wiphy = &rdev->wiphy;
request->interval = interval;
request->scan_start = jiffies;
err = rdev->ops->sched_scan_start(&rdev->wiphy, dev, request);
if (!err) {

66
net/wireless/scan.c
View file

@ -47,6 +47,27 @@ static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
kref_put(&bss->ref, bss_release);
}
/* must hold dev->bss_lock! */
static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev,
unsigned long expire_time)
{
struct cfg80211_internal_bss *bss, *tmp;
bool expired = false;
list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
if (atomic_read(&bss->hold))
continue;
if (!time_after(expire_time, bss->ts))
continue;
__cfg80211_unlink_bss(dev, bss);
expired = true;
}
if (expired)
dev->bss_generation++;
}
void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
{
struct cfg80211_scan_request *request;
@ -72,10 +93,17 @@ void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
if (wdev->netdev)
cfg80211_sme_scan_done(wdev->netdev);
if (request->aborted)
if (request->aborted) {
nl80211_send_scan_aborted(rdev, wdev);
else
} else {
if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
/* flush entries from previous scans */
spin_lock_bh(&rdev->bss_lock);
__cfg80211_bss_expire(rdev, request->scan_start);
spin_unlock_bh(&rdev->bss_lock);
}
nl80211_send_scan_done(rdev, wdev);
}
#ifdef CONFIG_CFG80211_WEXT
if (wdev->netdev && !request->aborted) {
@ -126,16 +154,27 @@ EXPORT_SYMBOL(cfg80211_scan_done);
void __cfg80211_sched_scan_results(struct work_struct *wk)
{
struct cfg80211_registered_device *rdev;
struct cfg80211_sched_scan_request *request;
rdev = container_of(wk, struct cfg80211_registered_device,
sched_scan_results_wk);
request = rdev->sched_scan_req;
mutex_lock(&rdev->sched_scan_mtx);
/* we don't have sched_scan_req anymore if the scan is stopping */
if (rdev->sched_scan_req)
nl80211_send_sched_scan_results(rdev,
rdev->sched_scan_req->dev);
if (request) {
if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
/* flush entries from previous scans */
spin_lock_bh(&rdev->bss_lock);
__cfg80211_bss_expire(rdev, request->scan_start);
spin_unlock_bh(&rdev->bss_lock);
request->scan_start =
jiffies + msecs_to_jiffies(request->interval);
}
nl80211_send_sched_scan_results(rdev, request->dev);
}
mutex_unlock(&rdev->sched_scan_mtx);
}
@ -197,23 +236,9 @@ void cfg80211_bss_age(struct cfg80211_registered_device *dev,
}
}
/* must hold dev->bss_lock! */
void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
{
struct cfg80211_internal_bss *bss, *tmp;
bool expired = false;
list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
if (atomic_read(&bss->hold))
continue;
if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
continue;
__cfg80211_unlink_bss(dev, bss);
expired = true;
}
if (expired)
dev->bss_generation++;
__cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
}
const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
@ -962,6 +987,7 @@ int cfg80211_wext_siwscan(struct net_device *dev,
creq->ssids = (void *)&creq->channels[n_channels];
creq->n_channels = n_channels;
creq->n_ssids = 1;
creq->scan_start = jiffies;
/* translate "Scan on frequencies" request */
i = 0;

1
net/wireless/sme.c
View file

@ -138,6 +138,7 @@ static int cfg80211_conn_scan(struct wireless_dev *wdev)
request->wdev = wdev;
request->wiphy = &rdev->wiphy;
request->scan_start = jiffies;
rdev->scan_req = request;