For off-channel operation we would like to know whether or not frames
submitted for tx are dropped, but most tx interfaces don't return
any status. The low-level interfaces do return bool but make no
distinction between dropping a packet and sucessfully handing it off to
the driver.
Add an enum named ieee80211_tx_status which defines status codes to
indicate whether a tx request results in successfully handing the frame
off to the driver, queueing the frame, or dropping it. Convert all tx
interfaces to return one of the values.
Signed-off-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
---
net/mac80211/ieee80211_i.h | 53 ++++++++++++++++-------
net/mac80211/tx.c | 103 +++++++++++++++++++++++---------------------
2 files changed, 92 insertions(+), 64 deletions(-)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 63f0430..13fd13a 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1495,46 +1495,69 @@ void mac80211_ev_michael_mic_failure(struct ieee80211_sub_if_data *sdata, int ke
gfp_t gfp);
void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
bool bss_notify);
-void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
- enum ieee80211_band band);
-void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
- struct sk_buff *skb, int tid,
- enum ieee80211_band band);
+/**
+ * enum ieee80211_tx_status - Tx request status
+ * @IEEE80211_TX_OK: Tx request handed off to driver
+ * @IEEE80211_TX_DROPPED: Tx request dropped
+ * @IEEE80211_TX_QUEUED: Tx requeust queued
+ */
+enum ieee80211_tx_status {
+ IEEE80211_TX_OK,
+ IEEE80211_TX_DROPPED,
+ IEEE80211_TX_QUEUED,
+};
-static inline void
+enum ieee80211_tx_status
+ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
+ enum ieee80211_band band);
+
+enum ieee80211_tx_status
+__ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb, int tid,
+ enum ieee80211_band band);
+
+static inline enum ieee80211_tx_status
ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, int tid,
enum ieee80211_band band)
{
+ enum ieee80211_tx_status ret;
+
rcu_read_lock();
- __ieee80211_tx_skb_tid_band(sdata, skb, tid, band);
+ ret = __ieee80211_tx_skb_tid_band(sdata, skb, tid, band);
rcu_read_unlock();
+
+ return ret;
}
-static inline void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
- struct sk_buff *skb, int tid)
+static inline enum ieee80211_tx_status
+ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
+ int tid)
{
struct ieee80211_chanctx_conf *chanctx_conf;
+ enum ieee80211_tx_status ret;
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (WARN_ON(!chanctx_conf)) {
rcu_read_unlock();
kfree_skb(skb);
- return;
+ return IEEE80211_TX_DROPPED;
}
- __ieee80211_tx_skb_tid_band(sdata, skb, tid,
- chanctx_conf->def.chan->band);
+ ret = __ieee80211_tx_skb_tid_band(sdata, skb, tid,
+ chanctx_conf->def.chan->band);
rcu_read_unlock();
+
+ return ret;
}
-static inline void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata,
- struct sk_buff *skb)
+static inline enum ieee80211_tx_status
+ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
{
/* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
- ieee80211_tx_skb_tid(sdata, skb, 7);
+ return ieee80211_tx_skb_tid(sdata, skb, 7);
}
void ieee802_11_parse_elems(u8 *start, size_t len,
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index f32d681..7d25bb6 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1200,11 +1200,10 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
return TX_CONTINUE;
}
-static bool ieee80211_tx_frags(struct ieee80211_local *local,
- struct ieee80211_vif *vif,
- struct ieee80211_sta *sta,
- struct sk_buff_head *skbs,
- bool txpending)
+static enum ieee80211_tx_status
+ieee80211_tx_frags(struct ieee80211_local *local, struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta, struct sk_buff_head *skbs,
+ bool txpending)
{
struct ieee80211_tx_control control;
struct sk_buff *skb, *tmp;
@@ -1238,7 +1237,7 @@ static bool ieee80211_tx_frags(struct ieee80211_local *local,
spin_unlock_irqrestore(&local->queue_stop_reason_lock,
flags);
- return false;
+ return IEEE80211_TX_QUEUED;
}
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
@@ -1249,26 +1248,23 @@ static bool ieee80211_tx_frags(struct ieee80211_local *local,
drv_tx(local, &control, skb);
}
- return true;
+ return IEEE80211_TX_OK;
}
-/*
- * Returns false if the frame couldn't be transmitted but was queued instead.
- */
-static bool __ieee80211_tx(struct ieee80211_local *local,
- struct sk_buff_head *skbs, int led_len,
- struct sta_info *sta, bool txpending)
+static enum ieee80211_tx_status
+__ieee80211_tx(struct ieee80211_local *local, struct sk_buff_head *skbs,
+ int led_len, struct sta_info *sta, bool txpending)
{
struct ieee80211_tx_info *info;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_vif *vif;
struct ieee80211_sta *pubsta;
struct sk_buff *skb;
- bool result = true;
+ enum ieee80211_tx_status result;
__le16 fc;
if (WARN_ON(skb_queue_empty(skbs)))
- return true;
+ return IEEE80211_TX_OK;
skb = skb_peek(skbs);
fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
@@ -1291,7 +1287,7 @@ static bool __ieee80211_tx(struct ieee80211_local *local,
vif->hw_queue[skb_get_queue_mapping(skb)];
} else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
dev_kfree_skb(skb);
- return true;
+ return IEEE80211_TX_DROPPED;
} else
vif = NULL;
break;
@@ -1371,23 +1367,20 @@ static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
return 0;
}
-/*
- * Returns false if the frame couldn't be transmitted but was queued instead.
- */
-static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
- struct sk_buff *skb, bool txpending,
- enum ieee80211_band band)
+static enum ieee80211_tx_status
+ieee80211_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
+ bool txpending, enum ieee80211_band band)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_tx_data tx;
ieee80211_tx_result res_prepare;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- bool result = true;
+ enum ieee80211_tx_status result = IEEE80211_TX_OK;
int led_len;
if (unlikely(skb->len < 10)) {
dev_kfree_skb(skb);
- return true;
+ return IEEE80211_TX_DROPPED;
}
/* initialises tx */
@@ -1396,9 +1389,17 @@ static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
if (unlikely(res_prepare == TX_DROP)) {
ieee80211_free_txskb(&local->hw, skb);
- return true;
+ return IEEE80211_TX_DROPPED;
} else if (unlikely(res_prepare == TX_QUEUED)) {
- return true;
+ /*
+ * TX_QUEUED here means that the frame was queued in
+ * tid_tx while aggregation is being set up. This need
+ * not prevent tx of other pending frames, so indicate
+ * success if txpending is true.
+ */
+ if (txpending)
+ return IEEE80211_TX_OK;
+ return IEEE80211_TX_QUEUED;
}
info->band = band;
@@ -1447,8 +1448,9 @@ static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
return 0;
}
-void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
- enum ieee80211_band band)
+enum ieee80211_tx_status
+ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
+ enum ieee80211_band band)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
@@ -1466,7 +1468,7 @@ void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
ieee80211_free_txskb(&local->hw, skb);
- return;
+ return IEEE80211_TX_DROPPED;
}
hdr = (struct ieee80211_hdr *) skb->data;
@@ -1477,11 +1479,11 @@ void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
!is_multicast_ether_addr(hdr->addr1) &&
mesh_nexthop_resolve(skb, sdata)) {
/* skb queued: don't free */
- return;
+ return IEEE80211_TX_QUEUED;
}
ieee80211_set_qos_hdr(sdata, skb);
- ieee80211_tx(sdata, skb, false, band);
+ return ieee80211_tx(sdata, skb, false, band);
}
static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
@@ -2174,18 +2176,17 @@ void ieee80211_clear_tx_pending(struct ieee80211_local *local)
}
/*
- * Returns false if the frame couldn't be transmitted but was queued instead,
- * which in this case means re-queued -- take as an indication to stop sending
- * more pending frames.
+ * A return value of IEEE80211_TX_QUEUED in this case means re-queued --
+ * take as an indication to stop sending more pending frames.
*/
-static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
- struct sk_buff *skb)
+static enum ieee80211_tx_status
+ieee80211_tx_pending_skb(struct ieee80211_local *local, struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_sub_if_data *sdata;
struct sta_info *sta;
struct ieee80211_hdr *hdr;
- bool result;
+ enum ieee80211_tx_status tx_stat;
struct ieee80211_chanctx_conf *chanctx_conf;
sdata = vif_to_sdata(info->control.vif);
@@ -2194,10 +2195,10 @@ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (unlikely(!chanctx_conf)) {
dev_kfree_skb(skb);
- return true;
+ return IEEE80211_TX_DROPPED;
}
- result = ieee80211_tx(sdata, skb, true,
- chanctx_conf->def.chan->band);
+ tx_stat = ieee80211_tx(sdata, skb, true,
+ chanctx_conf->def.chan->band);
} else {
struct sk_buff_head skbs;
@@ -2207,10 +2208,10 @@ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
hdr = (struct ieee80211_hdr *)skb->data;
sta = sta_info_get(sdata, hdr->addr1);
- result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
+ tx_stat = __ieee80211_tx(local, &skbs, skb->len, sta, true);
}
- return result;
+ return tx_stat;
}
/*
@@ -2221,7 +2222,7 @@ void ieee80211_tx_pending(unsigned long data)
struct ieee80211_local *local = (struct ieee80211_local *)data;
unsigned long flags;
int i;
- bool txok;
+ enum ieee80211_tx_status tx_stat;
rcu_read_lock();
@@ -2247,10 +2248,10 @@ void ieee80211_tx_pending(unsigned long data)
spin_unlock_irqrestore(&local->queue_stop_reason_lock,
flags);
- txok = ieee80211_tx_pending_skb(local, skb);
+ tx_stat = ieee80211_tx_pending_skb(local, skb);
spin_lock_irqsave(&local->queue_stop_reason_lock,
flags);
- if (!txok)
+ if (tx_stat == IEEE80211_TX_QUEUED)
break;
}
@@ -2775,11 +2776,13 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
-void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
- struct sk_buff *skb, int tid,
- enum ieee80211_band band)
+enum ieee80211_tx_status
+__ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb, int tid,
+ enum ieee80211_band band)
{
int ac = ieee802_1d_to_ac[tid & 7];
+ enum ieee80211_tx_status ret;
skb_set_mac_header(skb, 0);
skb_set_network_header(skb, 0);
@@ -2794,6 +2797,8 @@ void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
* requirements are that we do not come into tx with bhs on.
*/
local_bh_disable();
- ieee80211_xmit(sdata, skb, band);
+ ret = ieee80211_xmit(sdata, skb, band);
local_bh_enable();
+
+ return ret;
}
--
1.7.9.5
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