[PATCH 298/379][SRU][OEM-5.6] mac80211: extend ieee80211_tx_status_ext to support bulk free

[You-Sheng Yang]

From: Felix Fietkau <nbd at nbd.name>

BugLink: https://bugs.launchpad.net/bugs/1879633

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

Signed-off-by: Felix Fietkau <nbd at nbd.name>
Link: https://lore.kernel.org/r/20200908123702.88454-13-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
(cherry picked from commit f02dff93e26bef46f5511f1e8229061bd23c3074)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 include/net/mac80211.h |  2 ++
 net/mac80211/status.c  | 10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 123d7ad563ac..8ad6d104109f 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1091,12 +1091,14 @@ 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 500d77f21e4e..7f92458ddd67 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -1038,7 +1038,10 @@ 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;
 	}
 
@@ -1167,7 +1170,10 @@ 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);
 
-- 
2.29.2