package/kernel/mac80211/patches/subsys/323-mac80211-extend-ieee80211_tx_status_ext-to-support-b.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 21 Aug 2020 05:49:07 +0200
   3 Subject: [PATCH] mac80211: extend ieee80211_tx_status_ext to support bulk
   4  free
   5
   6 Store processed skbs ready to be freed in a list so the driver bulk free them
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 ---
  10
  11 --- a/include/net/mac80211.h
  12 +++ b/include/net/mac80211.h
  13 @@ -1092,12 +1092,14 @@ ieee80211_info_get_tx_time_est(struct ie
  14   * @info: Basic tx status information
  15   * @skb: Packet skb (can be NULL if not provided by the driver)
  16   * @rate: The TX rate that was used when sending the packet
  17 + * @free_list: list where processed skbs are stored to be free'd by the driver
  18   */
  19  struct ieee80211_tx_status {
  20         struct ieee80211_sta *sta;
  21         struct ieee80211_tx_info *info;
  22         struct sk_buff *skb;
  23         struct rate_info *rate;
  24 +       struct list_head *free_list;
  25  };
  26
  27  /**
  28 --- a/net/mac80211/status.c
  29 +++ b/net/mac80211/status.c
  30 @@ -1053,7 +1053,10 @@ static void __ieee80211_tx_status(struct
  31          * with this test...
  32          */
  33         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
  34 -               dev_kfree_skb(skb);
  35 +               if (status->free_list)
  36 +                       list_add_tail(&skb->list, status->free_list);
  37 +               else
  38 +                       dev_kfree_skb(skb);
  39                 return;
  40         }
  41
  42 @@ -1182,7 +1185,10 @@ free:
  43                 return;
  44
  45         ieee80211_report_used_skb(local, skb, false);
  46 -       dev_kfree_skb(skb);
  47 +       if (status->free_list)
  48 +               list_add_tail(&skb->list, status->free_list);
  49 +       else
  50 +               dev_kfree_skb(skb);
  51  }
  52  EXPORT_SYMBOL(ieee80211_tx_status_ext);
  53