summaryrefslogtreecommitdiffstats
path: root/net/mac80211/ieee80211_i.h
diff options
context:
space:
mode:
authorManikanta Pubbisetty <mpubbise@codeaurora.org>2018-07-10 20:42:53 +0200
committerJohannes Berg <johannes.berg@intel.com>2018-08-28 11:16:35 +0200
commit21a5d4c3a45ca608477a083096cfbce76e449a0c (patch)
tree683ec470ca1a00281ca6d6521bb93d5e4a5c8779 /net/mac80211/ieee80211_i.h
parentcfg80211: Avoid regulatory restore when COUNTRY_IE_IGNORE is set (diff)
downloadlinux-21a5d4c3a45ca608477a083096cfbce76e449a0c.tar.xz
linux-21a5d4c3a45ca608477a083096cfbce76e449a0c.zip
mac80211: add stop/start logic for software TXQs
Sometimes, it is required to stop the transmissions momentarily and resume it later; stopping the txqs becomes very critical in scenarios where the packet transmission has to be ceased completely. For example, during the hardware restart, during off channel operations, when initiating CSA(upon detecting a radar on the DFS channel), etc. The TX queue stop/start logic in mac80211 works well in stopping the TX when drivers make use of netdev queues, i.e, when Qdiscs in network layer take care of traffic scheduling. Since the devices implementing wake_tx_queue can run without Qdiscs, packets will be handed to mac80211 directly without queueing them in the netdev queues. Also, mac80211 does not invoke any of the netif_stop_*/netif_wake_* APIs if wake_tx_queue is implemented. Since the queues are not stopped in this case, transmissions can continue and this will impact negatively on the operation of the wireless device. For example, During hardware restart, we stop the netdev queues so that packets are not sent to the driver. Since ath10k implements wake_tx_queue, TX queues will not be stopped and packets might reach the hardware while it is restarting; this can make hardware unresponsive and the only possible option for recovery is to reboot the entire system. There is another problem to this, it is observed that the packets were sent on the DFS channel for a prolonged duration after radar detection impacting the channel closing time. We can still invoke netif stop/wake APIs when wake_tx_queue is implemented but this could lead to packet drops in network layer; adding stop/start logic for software TXQs in mac80211 instead makes more sense; the change proposed adds the same in mac80211. Signed-off-by: Manikanta Pubbisetty <mpubbise@codeaurora.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/ieee80211_i.h')
-rw-r--r--net/mac80211/ieee80211_i.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 172aeae21ae9..348a52cefb43 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -818,6 +818,7 @@ enum txq_info_flags {
IEEE80211_TXQ_STOP,
IEEE80211_TXQ_AMPDU,
IEEE80211_TXQ_NO_AMSDU,
+ IEEE80211_TXQ_STOP_NETIF_TX,
};
/**
@@ -1226,6 +1227,7 @@ struct ieee80211_local {
struct sk_buff_head pending[IEEE80211_MAX_QUEUES];
struct tasklet_struct tx_pending_tasklet;
+ struct tasklet_struct wake_txqs_tasklet;
atomic_t agg_queue_stop[IEEE80211_MAX_QUEUES];
@@ -2038,6 +2040,7 @@ void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata);
void ieee80211_fill_txq_stats(struct cfg80211_txq_stats *txqstats,
struct txq_info *txqi);
+void ieee80211_wake_txqs(unsigned long data);
void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
u16 transaction, u16 auth_alg, u16 status,
const u8 *extra, size_t extra_len, const u8 *bssid,