[PATCH V9 1/3] mac80211: move store skb ack code to its own function

[John Crispin]

This patch moves the code handling SKBTX_WIFI_STATUS inside the TX path
into an extra function. This allows us to reuse it inside the 802.11 encap
offloading datapath.

Signed-off-by: John Crispin <j...@phrozen.org>
---
 net/mac80211/tx.c | 49 ++++++++++++++++++++++++++++-------------------
 1 file changed, 29 insertions(+), 20 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 235c6377a203..be3ce5e5a1c3 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2423,6 +2423,33 @@ static int ieee80211_lookup_ra_sta(struct 
ieee80211_sub_if_data *sdata,
        return 0;
 }
 
+static int ieee80211_store_ack_skb(struct ieee80211_local *local,
+                                  struct sk_buff *skb,
+                                  u32 *info_flags)
+{
+       struct sk_buff *ack_skb = skb_clone_sk(skb);
+       u16 info_id = 0;
+
+       if (ack_skb) {
+               unsigned long flags;
+               int id;
+
+               spin_lock_irqsave(&local->ack_status_lock, flags);
+               id = idr_alloc(&local->ack_status_frames, ack_skb,
+                              1, 0x10000, GFP_ATOMIC);
+               spin_unlock_irqrestore(&local->ack_status_lock, flags);
+
+               if (id >= 0) {
+                       info_id = id;
+                       *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
+               } else {
+                       kfree_skb(ack_skb);
+               }
+       }
+
+       return info_id;
+}
+
 /**
  * ieee80211_build_hdr - build 802.11 header in the given frame
  * @sdata: virtual interface to build the header for
@@ -2716,26 +2743,8 @@ static struct sk_buff *ieee80211_build_hdr(struct 
ieee80211_sub_if_data *sdata,
        }
 
        if (unlikely(!multicast && skb->sk &&
-                    skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
-               struct sk_buff *ack_skb = skb_clone_sk(skb);
-
-               if (ack_skb) {
-                       unsigned long flags;
-                       int id;
-
-                       spin_lock_irqsave(&local->ack_status_lock, flags);
-                       id = idr_alloc(&local->ack_status_frames, ack_skb,
-                                      1, 0x10000, GFP_ATOMIC);
-                       spin_unlock_irqrestore(&local->ack_status_lock, flags);
-
-                       if (id >= 0) {
-                               info_id = id;
-                               info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
-                       } else {
-                               kfree_skb(ack_skb);
-                       }
-               }
-       }
+                    skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS))
+               info_id = ieee80211_store_ack_skb(local, skb, &info_flags);
 
        /*
         * If the skb is shared we need to obtain our own copy.
-- 
2.20.1


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