[PATCH v2] cfg80211: Add background scan period attribute.

[PATCH v2] cfg80211: Add background scan period attribute.

[Bala Shanmugam]

Receive background scan period as part of connect
command and pass the same to driver.

Signed-off-by: Bala Shanmugam <bkamatch@qca.qualcomm.com>
---
 include/linux/nl80211.h |    9 +++++++++
 include/net/cfg80211.h  |    3 +++
 net/wireless/nl80211.c  |    7 +++++++
 net/wireless/wext-sme.c |    3 +++
 4 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index be35a68..e81d327 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -369,6 +369,10 @@
  *	%NL80211_ATTR_WIPHY_FREQ, %NL80211_ATTR_CONTROL_PORT,
  *	%NL80211_ATTR_CONTROL_PORT_ETHERTYPE and
  *	%NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT.
+ *	Background scan period can optionally be
+ *	specified in %NL80211_ATTR_BG_SCAN_PERIOD,
+ *	if not specified default background scan configuration
+ *	in driver is used and if period value is 0, bg scan will be disabled.
  *	It is also sent as an event, with the BSSID and response IEs when the
  *	connection is established or failed to be established. This can be
  *	determined by the STATUS_CODE attribute.
@@ -1197,6 +1201,9 @@ enum nl80211_commands {
  * @NL80211_ATTR_NOACK_MAP: This u16 bitmap contains the No Ack Policy of
  *      up to 16 TIDs.
  *
+ * @NL80211_ATTR_BG_SCAN_PERIOD: Background scan period in seconds
+ *      or 0 to disable background scan.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1442,6 +1449,8 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_NOACK_MAP,
 
+	NL80211_ATTR_BG_SCAN_PERIOD,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 0178c74..8b3b3b8 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1200,6 +1200,8 @@ struct cfg80211_ibss_params {
  * @key_idx: index of WEP key for shared key authentication
  * @key: WEP key for shared key authentication
  * @flags:  See &enum cfg80211_assoc_req_flags
+ * @bg_scan_period:  Background scan period in seconds
+ *   or -1 to indicate that default value is to be used.
  * @ht_capa:  HT Capabilities over-rides.  Values set in ht_capa_mask
  *   will be used in ht_capa.  Un-supported values will be ignored.
  * @ht_capa_mask:  The bits of ht_capa which are to be used.
@@ -1217,6 +1219,7 @@ struct cfg80211_connect_params {
 	const u8 *key;
 	u8 key_len, key_idx;
 	u32 flags;
+	int bg_scan_period;
 	struct ieee80211_ht_cap ht_capa;
 	struct ieee80211_ht_cap ht_capa_mask;
 };
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 1998c36..a3a6013 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -204,6 +204,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
 		.len = NL80211_HT_CAPABILITY_LEN
 	},
 	[NL80211_ATTR_NOACK_MAP] = { .type = NLA_U16 },
+	[NL80211_ATTR_BG_SCAN_PERIOD] = { .type = NLA_U16 },
 };
 
 /* policy for the key attributes */
@@ -5090,6 +5091,12 @@ static int nl80211_connect(struct sk_buff *skb, struct genl_info *info)
 	} else
 		connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 
+	connect.bg_scan_period = -1;
+	if (info->attrs[NL80211_ATTR_BG_SCAN_PERIOD]) {
+		connect.bg_scan_period =
+			nla_get_u16(info->attrs[NL80211_ATTR_BG_SCAN_PERIOD]);
+	}
+
 	connect.privacy = info->attrs[NL80211_ATTR_PRIVACY];
 
 	err = nl80211_crypto_settings(rdev, info, &connect.crypto,
diff --git a/net/wireless/wext-sme.c b/net/wireless/wext-sme.c
index 326750b..7c01c2f 100644
--- a/net/wireless/wext-sme.c
+++ b/net/wireless/wext-sme.c
@@ -30,6 +30,9 @@ int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 	wdev->wext.connect.ie = wdev->wext.ie;
 	wdev->wext.connect.ie_len = wdev->wext.ie_len;
 
+	/* Use default background scan period */
+	wdev->wext.connect.bg_scan_period = -1;
+
 	if (wdev->wext.keys) {
 		wdev->wext.keys->def = wdev->wext.default_key;
 		wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
-- 
1.7.4.1

Re: [PATCH v2] cfg80211: Add background scan period attribute.

[Johannes Berg]

On Thu, 2012-03-01 at 12:09 +0530, Bala Shanmugam wrote:
> Receive background scan period as part of connect
> command and pass the same to driver.
> 
> Signed-off-by: Bala Shanmugam <bkamatch@qca.qualcomm.com>
> ---
>  include/linux/nl80211.h |    9 +++++++++
>  include/net/cfg80211.h  |    3 +++
>  net/wireless/nl80211.c  |    7 +++++++
>  net/wireless/wext-sme.c |    3 +++
>  4 files changed, 22 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
> index be35a68..e81d327 100644
> --- a/include/linux/nl80211.h
> +++ b/include/linux/nl80211.h
> @@ -369,6 +369,10 @@
>   *	%NL80211_ATTR_WIPHY_FREQ, %NL80211_ATTR_CONTROL_PORT,
>   *	%NL80211_ATTR_CONTROL_PORT_ETHERTYPE and
>   *	%NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT.
> + *	Background scan period can optionally be
> + *	specified in %NL80211_ATTR_BG_SCAN_PERIOD,
> + *	if not specified default background scan configuration
> + *	in driver is used and if period value is 0, bg scan will be disabled.

Maybe this should also indicate that the value is ignored unless the
device advertises roaming support with NL80211_ATTR_ROAM_SUPPORT?

I'm not sure I like the whole default value thing since it's kinda
magic, but I guess I can live with it.

johannes

Re: [PATCH v2] cfg80211: Add background scan period attribute.

[bkamatch]

On 03/01/2012 07:53 PM, Johannes Berg wrote:
> On Thu, 2012-03-01 at 12:09 +0530, Bala Shanmugam wrote:
>> Receive background scan period as part of connect
>> command and pass the same to driver.
>>
>> Signed-off-by: Bala Shanmugam<bkamatch@qca.qualcomm.com>
>> ---
>>   include/linux/nl80211.h |    9 +++++++++
>>   include/net/cfg80211.h  |    3 +++
>>   net/wireless/nl80211.c  |    7 +++++++
>>   net/wireless/wext-sme.c |    3 +++
>>   4 files changed, 22 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
>> index be35a68..e81d327 100644
>> --- a/include/linux/nl80211.h
>> +++ b/include/linux/nl80211.h
>> @@ -369,6 +369,10 @@
>>    *	%NL80211_ATTR_WIPHY_FREQ, %NL80211_ATTR_CONTROL_PORT,
>>    *	%NL80211_ATTR_CONTROL_PORT_ETHERTYPE and
>>    *	%NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT.
>> + *	Background scan period can optionally be
>> + *	specified in %NL80211_ATTR_BG_SCAN_PERIOD,
>> + *	if not specified default background scan configuration
>> + *	in driver is used and if period value is 0, bg scan will be disabled.
> Maybe this should also indicate that the value is ignored unless the
> device advertises roaming support with NL80211_ATTR_ROAM_SUPPORT?
>
> I'm not sure I like the whole default value thing since it's kinda
> magic, but I guess I can live with it.
>
> johannes
>

Thats true.  Thanks for pointing it.

Regards,
Bala.