[PATCH v2 10/13] mac80211: extend ieee80211_tx_status_ext to support bulk free

Felix Fietkau
2020-08-21T04:24:59Z

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

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
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 0cd8dbe4e688..aaec7688e965 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 261bdda2ec08..4cfd569a5f55 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;
}

@@ -1168,7 +1171,10 @@ 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);

--
2.28.0