[v4,12/14] mac80211: extend ieee80211_tx_status_ext to support bulk free

Commit Message

Felix Fietkau Sept. 8, 2020, 12:37 p.m. UTC

Store processed skbs ready to be freed in a list so the driver bulk free them

Signed-off-by: Felix Fietkau <[e-mail]>
---
 include/net/mac80211.h |  2 ++
 net/mac80211/status.c  | 10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

Patch

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index fc31976323e6..1d1290aca870 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1095,12 +1095,14 @@  ieee80211_info_get_tx_time_est(struct ieee80211_tx_info *info)
  * @info: Basic tx status information
  * @skb: Packet skb (can be NULL if not provided by the driver)
  * @rate: The TX rate that was used when sending the packet
+ * @free_list: list where processed skbs are stored to be free'd by the driver
  */
 struct ieee80211_tx_status {
 	struct ieee80211_sta *sta;
 	struct ieee80211_tx_info *info;
 	struct sk_buff *skb;
 	struct rate_info *rate;
+	struct list_head *free_list;
 };
 
 /**
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index a3543c3dbd3d..a0dd926dceb3 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -1044,7 +1044,10 @@  static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 	 * with this test...
 	 */
 	if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
-		dev_kfree_skb(skb);
+		if (status->free_list)
+			list_add_tail(&skb->list, status->free_list);
+		else
+			dev_kfree_skb(skb);
 		return;
 	}
 
@@ -1169,7 +1172,10 @@  void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
 		return;
 
 	ieee80211_report_used_skb(local, skb, false);
-	dev_kfree_skb(skb);
+	if (status->free_list)
+		list_add_tail(&skb->list, status->free_list);
+	else
+		dev_kfree_skb(skb);
 }
 EXPORT_SYMBOL(ieee80211_tx_status_ext);