package/kernel/mac80211/patches/304-mac80211-fix-fast_tx-header-alignment.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Thu, 19 May 2016 17:32:13 +0200
   3 Subject: [PATCH] mac80211: fix fast_tx header alignment
   4
   5 The header field is defined as u8[] but also accessed as struct
   6 ieee80211_hdr. Enforce an alignment of 2 to prevent unnecessary
   7 unaligned accesses, which can be very harmful for performance on many
   8 platforms.
   9
  10 Fixes: e495c24731a2 ("mac80211: extend fast-xmit for more ciphers")
  11 Cc: stable@vger.kernel.org
  12 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  13 ---
  14
  15 --- a/net/mac80211/sta_info.h
  16 +++ b/net/mac80211/sta_info.h
  17 @@ -280,7 +280,7 @@ struct ieee80211_fast_tx {
  18         u8 sa_offs, da_offs, pn_offs;
  19         u8 band;
  20         u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
  21 -              sizeof(rfc1042_header)];
  22 +              sizeof(rfc1042_header)] __aligned(2);
  23
  24         struct rcu_head rcu_head;
  25  };