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cfg80211/mac80211: revert to stack allocation for sinfo

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Arend's previous patch made the sinfo structure smaller
again by to dynamically allocating the per-tid stats
only when needed. Thus, revert to stack allocation for
the struct to simplify the code.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
2018-05-18 09:57:55 +02:00
parent 8689c051a2
commit 73887fd906
3 changed files with 48 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files

86
net/wireless/nl80211.c
View File

@@ -4723,17 +4723,13 @@ static int nl80211_send_station(struct sk_buff *msg, u32 cmd, u32 portid,
static int nl80211_dump_station(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct station_info *sinfo;
struct station_info sinfo;
struct cfg80211_registered_device *rdev;
struct wireless_dev *wdev;
u8 mac_addr[ETH_ALEN];
int sta_idx = cb->args[2];
int err;
sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
if (!sinfo)
return -ENOMEM;
rtnl_lock();
err = nl80211_prepare_wdev_dump(skb, cb, &rdev, &wdev);
if (err)
@@ -4750,9 +4746,9 @@ static int nl80211_dump_station(struct sk_buff *skb,
}
while (1) {
memset(sinfo, 0, sizeof(*sinfo));
memset(&sinfo, 0, sizeof(sinfo));
err = rdev_dump_station(rdev, wdev->netdev, sta_idx,
mac_addr, sinfo);
mac_addr, &sinfo);
if (err == -ENOENT)
break;
if (err)
@@ -4762,7 +4758,7 @@ static int nl80211_dump_station(struct sk_buff *skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
rdev, wdev->netdev, mac_addr,
sinfo) < 0)
&sinfo) < 0)
goto out;
sta_idx++;
@@ -4773,7 +4769,6 @@ static int nl80211_dump_station(struct sk_buff *skb,
err = skb->len;
out_err:
rtnl_unlock();
kfree(sinfo);
return err;
}
@@ -4782,49 +4777,37 @@ static int nl80211_get_station(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct net_device *dev = info->user_ptr[1];
struct station_info *sinfo;
struct station_info sinfo;
struct sk_buff *msg;
u8 *mac_addr = NULL;
int err;
sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
if (!sinfo)
return -ENOMEM;
memset(&sinfo, 0, sizeof(sinfo));
if (!info->attrs[NL80211_ATTR_MAC]) {
err = -EINVAL;
goto out;
}
if (!info->attrs[NL80211_ATTR_MAC])
return -EINVAL;
mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
if (!rdev->ops->get_station) {
err = -EOPNOTSUPP;
goto out;
}
if (!rdev->ops->get_station)
return -EOPNOTSUPP;
err = rdev_get_station(rdev, dev, mac_addr, sinfo);
err = rdev_get_station(rdev, dev, mac_addr, &sinfo);
if (err)
goto out;
return err;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg) {
err = -ENOMEM;
goto out;
}
if (!msg)
return -ENOMEM;
if (nl80211_send_station(msg, NL80211_CMD_NEW_STATION,
info->snd_portid, info->snd_seq, 0,
rdev, dev, mac_addr, sinfo) < 0) {
rdev, dev, mac_addr, &sinfo) < 0) {
nlmsg_free(msg);
err = -ENOBUFS;
goto out;
return -ENOBUFS;
}
err = genlmsg_reply(msg, info);
out:
kfree(sinfo);
return err;
return genlmsg_reply(msg, info);
}
int cfg80211_check_station_change(struct wiphy *wiphy,
@@ -10088,26 +10071,18 @@ static int cfg80211_cqm_rssi_update(struct cfg80211_registered_device *rdev,
*/
if (!wdev->cqm_config->last_rssi_event_value && wdev->current_bss &&
rdev->ops->get_station) {
struct station_info *sinfo;
struct station_info sinfo = {};
u8 *mac_addr;
sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
if (!sinfo)
return -ENOMEM;
mac_addr = wdev->current_bss->pub.bssid;
err = rdev_get_station(rdev, dev, mac_addr, sinfo);
if (err) {
kfree(sinfo);
err = rdev_get_station(rdev, dev, mac_addr, &sinfo);
if (err)
return err;
}
if (sinfo->filled & BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG))
if (sinfo.filled & BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG))
wdev->cqm_config->last_rssi_event_value =
(s8)sinfo->rx_beacon_signal_avg;
kfree(sinfo);
(s8) sinfo.rx_beacon_signal_avg;
}
last = wdev->cqm_config->last_rssi_event_value;
@@ -14641,32 +14616,25 @@ void cfg80211_del_sta_sinfo(struct net_device *dev, const u8 *mac_addr,
struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
struct sk_buff *msg;
struct station_info *empty_sinfo = NULL;
struct station_info empty_sinfo = {};
if (!sinfo) {
empty_sinfo = kzalloc(sizeof(*empty_sinfo), GFP_KERNEL);
if (!empty_sinfo)
return;
sinfo = empty_sinfo;
}
if (!sinfo)
sinfo = &empty_sinfo;
trace_cfg80211_del_sta(dev, mac_addr);
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
if (!msg)
goto out;
return;
if (nl80211_send_station(msg, NL80211_CMD_DEL_STATION, 0, 0, 0,
rdev, dev, mac_addr, sinfo) < 0) {
nlmsg_free(msg);
goto out;
return;
}
genlmsg_multicast_netns(&nl80211_fam, wiphy_net(&rdev->wiphy), msg, 0,
NL80211_MCGRP_MLME, gfp);
out:
kfree(empty_sinfo);
}
EXPORT_SYMBOL(cfg80211_del_sta_sinfo);

23
net/wireless/wext-compat.c
View File

@@ -1254,7 +1254,7 @@ static int cfg80211_wext_giwrate(struct net_device *dev,
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct station_info *sinfo;
struct station_info sinfo = {};
u8 addr[ETH_ALEN];
int err;
@@ -1274,23 +1274,16 @@ static int cfg80211_wext_giwrate(struct net_device *dev,
if (err)
return err;
sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
if (!sinfo)
return -ENOMEM;
err = rdev_get_station(rdev, dev, addr, sinfo);
err = rdev_get_station(rdev, dev, addr, &sinfo);
if (err)
goto out;
return err;
if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
err = -EOPNOTSUPP;
goto out;
}
if (!(sinfo.filled & BIT(NL80211_STA_INFO_TX_BITRATE)))
return -EOPNOTSUPP;
rate->value = 100000 * cfg80211_calculate_bitrate(&sinfo->txrate);
out:
kfree(sinfo);
return err;
rate->value = 100000 * cfg80211_calculate_bitrate(&sinfo.txrate);
return 0;
}
/* Get wireless statistics. Called by /proc/net/wireless and by SIOCGIWSTATS */