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cfg80211/mac80211: allow management TX to not wait for ACK

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For probe responses it can be useful to not wait for ACK to
avoid retransmissions if the station that sent the probe is
already on the next channel, so allow userspace to request
not caring about the ACK with a new nl80211 flag.

Since mac80211 needs to be updated for the new function
prototype anyway implement it right away -- it's just a
few lines of code.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-11-04 11:18:21 +01:00 committed by John W. Linville
parent e7f4a940bb
commit e247bd9068
7 changed files with 46 additions and 23 deletions
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3
drivers/net/wireless/ath/ath6kl/cfg80211.c
View File

@ -1732,7 +1732,8 @@ static int ath6kl_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
struct ieee80211_channel *chan, bool offchan,
enum nl80211_channel_type channel_type,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, bool no_cck, u64 *cookie)
const u8 *buf, size_t len, bool no_cck,
bool dont_wait_for_ack, u64 *cookie)
{
struct ath6kl *ar = ath6kl_priv(dev);
u32 id;

7
include/linux/nl80211.h
View File

@ -1151,6 +1151,11 @@ enum nl80211_commands {
* with support for the features listed in this attribute, see
* &enum nl80211_ap_sme_features.
*
* @NL80211_ATTR_DONT_WAIT_FOR_ACK: Used with %NL80211_CMD_FRAME, this tells
* the driver to not wait for an acknowledgement. Note that due to this,
* it will also not give a status callback nor return a cookie. This is
* mostly useful for probe responses to save airtime.
*
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@ -1381,6 +1386,8 @@ enum nl80211_attrs {
NL80211_ATTR_DEVICE_AP_SME,
NL80211_ATTR_DONT_WAIT_FOR_ACK,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,

2
include/net/cfg80211.h
View File

@ -1588,7 +1588,7 @@ struct cfg80211_ops {
enum nl80211_channel_type channel_type,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, bool no_cck,
u64 *cookie);
bool dont_wait_for_ack, u64 *cookie);
int (*mgmt_tx_cancel_wait)(struct wiphy *wiphy,
struct net_device *dev,
u64 cookie);

11
net/mac80211/cfg.c
View File

@ -1936,7 +1936,7 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
enum nl80211_channel_type channel_type,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, bool no_cck,
u64 *cookie)
bool dont_wait_for_ack, u64 *cookie)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
@ -1944,10 +1944,15 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
struct sta_info *sta;
struct ieee80211_work *wk;
const struct ieee80211_mgmt *mgmt = (void *)buf;
u32 flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX |
IEEE80211_TX_CTL_REQ_TX_STATUS;
u32 flags;
bool is_offchan = false;
if (dont_wait_for_ack)
flags = IEEE80211_TX_CTL_NO_ACK;
else
flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX |
IEEE80211_TX_CTL_REQ_TX_STATUS;
/* Check that we are on the requested channel for transmission */
if (chan != local->tmp_channel &&
chan != local->oper_channel)

2
net/wireless/core.h
View File

@ -378,7 +378,7 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
enum nl80211_channel_type channel_type,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, bool no_cck,
u64 *cookie);
bool dont_wait_for_ack, u64 *cookie);
/* SME */
int __cfg80211_connect(struct cfg80211_registered_device *rdev,

5
net/wireless/mlme.c
View File

@ -904,7 +904,7 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
enum nl80211_channel_type channel_type,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, bool no_cck,
u64 *cookie)
bool dont_wait_for_ack, u64 *cookie)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
const struct ieee80211_mgmt *mgmt;
@ -995,7 +995,8 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
/* Transmit the Action frame as requested by user space */
return rdev->ops->mgmt_tx(&rdev->wiphy, dev, chan, offchan,
channel_type, channel_type_valid,
wait, buf, len, no_cck, cookie);
wait, buf, len, no_cck, dont_wait_for_ack,
cookie);
}
bool cfg80211_rx_mgmt(struct net_device *dev, int freq, const u8 *buf,

17
net/wireless/nl80211.c
View File

@ -196,6 +196,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_TDLS_OPERATION] = { .type = NLA_U8 },
[NL80211_ATTR_TDLS_SUPPORT] = { .type = NLA_FLAG },
[NL80211_ATTR_TDLS_EXTERNAL_SETUP] = { .type = NLA_FLAG },
[NL80211_ATTR_DONT_WAIT_FOR_ACK] = { .type = NLA_FLAG },
};
/* policy for the key attributes */
@ -5282,10 +5283,11 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
int err;
void *hdr;
u64 cookie;
struct sk_buff *msg;
struct sk_buff *msg = NULL;
unsigned int wait = 0;
bool offchan;
bool no_cck;
bool offchan, no_cck, dont_wait_for_ack;
dont_wait_for_ack = info->attrs[NL80211_ATTR_DONT_WAIT_FOR_ACK];
if (!info->attrs[NL80211_ATTR_FRAME] ||
!info->attrs[NL80211_ATTR_WIPHY_FREQ])
@ -5329,6 +5331,7 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
if (chan == NULL)
return -EINVAL;
if (!dont_wait_for_ack) {
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
@ -5340,18 +5343,24 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
err = PTR_ERR(hdr);
goto free_msg;
}
}
err = cfg80211_mlme_mgmt_tx(rdev, dev, chan, offchan, channel_type,
channel_type_valid, wait,
nla_data(info->attrs[NL80211_ATTR_FRAME]),
nla_len(info->attrs[NL80211_ATTR_FRAME]),
no_cck, &cookie);
no_cck, dont_wait_for_ack, &cookie);
if (err)
goto free_msg;
if (msg) {
NLA_PUT_U64(msg, NL80211_ATTR_COOKIE, cookie);
genlmsg_end(msg, hdr);
return genlmsg_reply(msg, info);
}
return 0;
nla_put_failure:
err = -ENOBUFS;