From a293911d4fd5e8593dbf478399a77f990d466269 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Tue, 14 Dec 2010 17:54:28 +0100
Subject: [PATCH] nl80211: advertise maximum remain-on-channel duration
With the upcoming hardware offload implementation,
some devices will have a different maximum duration
for the remain-on-channel command. Advertise the
maximum duration in mac80211, and make mac80211 set
it.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
include/linux/nl80211.h | 5 +++++
include/net/cfg80211.h | 5 +++++
net/mac80211/main.c | 2 ++
net/wireless/nl80211.c | 7 ++++++-
4 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index b8fa25d741ba..1cee56b3a79a 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -773,6 +773,9 @@ enum nl80211_commands {
* cache, a wiphy attribute.
*
* @NL80211_ATTR_DURATION: Duration of an operation in milliseconds, u32.
+ * @NL80211_ATTR_MAX_REMAIN_ON_CHANNEL_DURATION: Device attribute that
+ * specifies the maximum duration that can be requested with the
+ * remain-on-channel operation, in milliseconds, u32.
*
* @NL80211_ATTR_COOKIE: Generic 64-bit cookie to identify objects.
*
@@ -1035,6 +1038,8 @@ enum nl80211_attrs {
NL80211_ATTR_KEY_DEFAULT_TYPES,
+ NL80211_ATTR_MAX_REMAIN_ON_CHANNEL_DURATION,
+
/* 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 22be7c625b70..f45e15f12446 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1474,6 +1474,9 @@ struct ieee80211_txrx_stypes {
*
* @available_antennas: bitmap of antennas which are available to configure.
* antenna configuration commands will be rejected unless this is set.
+ *
+ * @max_remain_on_channel_duration: Maximum time a remain-on-channel operation
+ * may request, if implemented.
*/
struct wiphy {
/* assign these fields before you register the wiphy */
@@ -1511,6 +1514,8 @@ struct wiphy {
char fw_version[ETHTOOL_BUSINFO_LEN];
u32 hw_version;
+ u16 max_remain_on_channel_duration;
+
u8 max_num_pmkids;
u32 available_antennas;
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index f7bdb7c78879..d87eb005690f 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -745,6 +745,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
}
}
+ local->hw.wiphy->max_remain_on_channel_duration = 5000;
+
result = wiphy_register(local->hw.wiphy);
if (result < 0)
goto fail_wiphy_register;
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 53f044370cde..594a6ac8b9d2 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -755,6 +755,10 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
nla_nest_end(msg, nl_cmds);
+ if (dev->ops->remain_on_channel)
+ NLA_PUT_U32(msg, NL80211_ATTR_MAX_REMAIN_ON_CHANNEL_DURATION,
+ dev->wiphy.max_remain_on_channel_duration);
+
/* for now at least assume all drivers have it */
if (dev->ops->mgmt_tx)
NLA_PUT_FLAG(msg, NL80211_ATTR_OFFCHANNEL_TX_OK);
@@ -4228,7 +4232,8 @@ static int nl80211_remain_on_channel(struct sk_buff *skb,
* We should be on that channel for at least one jiffie,
* and more than 5 seconds seems excessive.
*/
- if (!duration || !msecs_to_jiffies(duration) || duration > 5000)
+ if (!duration || !msecs_to_jiffies(duration) ||
+ duration > rdev->wiphy.max_remain_on_channel_duration)
return -EINVAL;
if (!rdev->ops->remain_on_channel)
--
2.20.1