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mac80211: move TX info into skb->cb

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This patch converts mac80211 and all drivers to have transmit
information and status in skb->cb rather than allocating extra
memory for it and copying all the data around. To make it fit,
a union is used where only data that is necessary for all steps
is kept outside of the union.

A number of fixes were done by Ivo, as well as the rt2x00 part
of this patch.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2008-05-15 12:55:29 +02:00
committed by John W. Linville
parent e24549485f
commit e039fa4a41
67 changed files with 976 additions and 1270 deletions
Download Patch File Download Diff File Expand all files Collapse all files

126
net/mac80211/main.c
View File

@@ -971,8 +971,7 @@ void ieee80211_if_setup(struct net_device *dev)
/* everything else */
static int __ieee80211_if_config(struct net_device *dev,
struct sk_buff *beacon,
struct ieee80211_tx_control *control)
struct sk_buff *beacon)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
@@ -990,13 +989,11 @@ static int __ieee80211_if_config(struct net_device *dev,
conf.ssid_len = sdata->u.sta.ssid_len;
} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
conf.beacon = beacon;
conf.beacon_control = control;
ieee80211_start_mesh(dev);
} else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
conf.ssid = sdata->u.ap.ssid;
conf.ssid_len = sdata->u.ap.ssid_len;
conf.beacon = beacon;
conf.beacon_control = control;
}
return local->ops->config_interface(local_to_hw(local),
&sdata->vif, &conf);
@@ -1009,23 +1006,21 @@ int ieee80211_if_config(struct net_device *dev)
if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
return ieee80211_if_config_beacon(dev);
return __ieee80211_if_config(dev, NULL, NULL);
return __ieee80211_if_config(dev, NULL);
}
int ieee80211_if_config_beacon(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_tx_control control;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct sk_buff *skb;
if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
return 0;
skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
&control);
skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
if (!skb)
return -ENOMEM;
return __ieee80211_if_config(dev, skb, &control);
return __ieee80211_if_config(dev, skb);
}
int ieee80211_hw_config(struct ieee80211_local *local)
@@ -1180,38 +1175,20 @@ void ieee80211_reset_erp_info(struct net_device *dev)
}
void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
struct sk_buff *skb,
struct ieee80211_tx_status *status)
struct sk_buff *skb)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_tx_status *saved;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
int tmp;
skb->dev = local->mdev;
saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
if (unlikely(!saved)) {
if (net_ratelimit())
printk(KERN_WARNING "%s: Not enough memory, "
"dropping tx status", skb->dev->name);
/* should be dev_kfree_skb_irq, but due to this function being
* named _irqsafe instead of just _irq we can't be sure that
* people won't call it from non-irq contexts */
dev_kfree_skb_any(skb);
return;
}
memcpy(saved, status, sizeof(struct ieee80211_tx_status));
/* copy pointer to saved status into skb->cb for use by tasklet */
memcpy(skb->cb, &saved, sizeof(saved));
skb->pkt_type = IEEE80211_TX_STATUS_MSG;
skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
&local->skb_queue : &local->skb_queue_unreliable, skb);
tmp = skb_queue_len(&local->skb_queue) +
skb_queue_len(&local->skb_queue_unreliable);
while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
(skb = skb_dequeue(&local->skb_queue_unreliable))) {
memcpy(&saved, skb->cb, sizeof(saved));
kfree(saved);
dev_kfree_skb_irq(skb);
tmp--;
I802_DEBUG_INC(local->tx_status_drop);
@@ -1225,7 +1202,6 @@ static void ieee80211_tasklet_handler(unsigned long data)
struct ieee80211_local *local = (struct ieee80211_local *) data;
struct sk_buff *skb;
struct ieee80211_rx_status rx_status;
struct ieee80211_tx_status *tx_status;
struct ieee80211_ra_tid *ra_tid;
while ((skb = skb_dequeue(&local->skb_queue)) ||
@@ -1240,12 +1216,8 @@ static void ieee80211_tasklet_handler(unsigned long data)
__ieee80211_rx(local_to_hw(local), skb, &rx_status);
break;
case IEEE80211_TX_STATUS_MSG:
/* get pointer to saved status out of skb->cb */
memcpy(&tx_status, skb->cb, sizeof(tx_status));
skb->pkt_type = 0;
ieee80211_tx_status(local_to_hw(local),
skb, tx_status);
kfree(tx_status);
ieee80211_tx_status(local_to_hw(local), skb);
break;
case IEEE80211_DELBA_MSG:
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
@@ -1274,24 +1246,15 @@ static void ieee80211_tasklet_handler(unsigned long data)
* Also, tx_packet_data in cb is restored from tx_control. */
static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
struct ieee80211_key *key,
struct sk_buff *skb,
struct ieee80211_tx_control *control)
struct sk_buff *skb)
{
int hdrlen, iv_len, mic_len;
struct ieee80211_tx_packet_data *pkt_data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
pkt_data->flags = 0;
if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
if (control->flags & IEEE80211_TXCTL_REQUEUE)
pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
pkt_data->queue = control->queue;
info->flags &= IEEE80211_TX_CTL_REQ_TX_STATUS |
IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
IEEE80211_TX_CTL_REQUEUE |
IEEE80211_TX_CTL_EAPOL_FRAME;
hdrlen = ieee80211_get_hdrlen_from_skb(skb);
@@ -1338,9 +1301,10 @@ no_key:
static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
struct sta_info *sta,
struct sk_buff *skb,
struct ieee80211_tx_status *status)
struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
sta->tx_filtered_count++;
/*
@@ -1382,18 +1346,16 @@ static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
*/
if (test_sta_flags(sta, WLAN_STA_PS) &&
skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
ieee80211_remove_tx_extra(local, sta->key, skb,
&status->control);
ieee80211_remove_tx_extra(local, sta->key, skb);
skb_queue_tail(&sta->tx_filtered, skb);
return;
}
if (!test_sta_flags(sta, WLAN_STA_PS) &&
!(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
!(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
/* Software retry the packet once */
status->control.flags |= IEEE80211_TXCTL_REQUEUE;
ieee80211_remove_tx_extra(local, sta->key, skb,
&status->control);
info->flags |= IEEE80211_TX_CTL_REQUEUE;
ieee80211_remove_tx_extra(local, sta->key, skb);
dev_queue_xmit(skb);
return;
}
@@ -1407,28 +1369,20 @@ static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
dev_kfree_skb(skb);
}
void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
struct ieee80211_tx_status *status)
void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct sk_buff *skb2;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
u16 frag, type;
struct ieee80211_tx_status_rtap_hdr *rthdr;
struct ieee80211_sub_if_data *sdata;
struct net_device *prev_dev = NULL;
if (!status) {
printk(KERN_ERR
"%s: ieee80211_tx_status called with NULL status\n",
wiphy_name(local->hw.wiphy));
dev_kfree_skb(skb);
return;
}
rcu_read_lock();
if (status->excessive_retries) {
if (info->status.excessive_retries) {
struct sta_info *sta;
sta = sta_info_get(local, hdr->addr1);
if (sta) {
@@ -1437,27 +1391,23 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
* The STA is in power save mode, so assume
* that this TX packet failed because of that.
*/
status->excessive_retries = 0;
status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
ieee80211_handle_filtered_frame(local, sta,
skb, status);
ieee80211_handle_filtered_frame(local, sta, skb);
rcu_read_unlock();
return;
}
}
}
if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
struct sta_info *sta;
sta = sta_info_get(local, hdr->addr1);
if (sta) {
ieee80211_handle_filtered_frame(local, sta, skb,
status);
ieee80211_handle_filtered_frame(local, sta, skb);
rcu_read_unlock();
return;
}
} else
rate_control_tx_status(local->mdev, skb, status);
rate_control_tx_status(local->mdev, skb);
rcu_read_unlock();
@@ -1471,14 +1421,14 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
if (status->flags & IEEE80211_TX_STATUS_ACK) {
if (info->flags & IEEE80211_TX_STAT_ACK) {
if (frag == 0) {
local->dot11TransmittedFrameCount++;
if (is_multicast_ether_addr(hdr->addr1))
local->dot11MulticastTransmittedFrameCount++;
if (status->retry_count > 0)
if (info->status.retry_count > 0)
local->dot11RetryCount++;
if (status->retry_count > 1)
if (info->status.retry_count > 1)
local->dot11MultipleRetryCount++;
}
@@ -1524,17 +1474,17 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
(1 << IEEE80211_RADIOTAP_DATA_RETRIES));
if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
!is_multicast_ether_addr(hdr->addr1))
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
(status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
(info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
rthdr->data_retries = status->retry_count;
rthdr->data_retries = info->status.retry_count;
/* XXX: is this sufficient for BPF? */
skb_set_mac_header(skb, 0);
@@ -1895,7 +1845,9 @@ static int __init ieee80211_init(void)
struct sk_buff *skb;
int ret;
BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
ret = rc80211_pid_init();
if (ret)