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@@ -0,0 +1,235 @@
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+From: Janusz Dziedzic <[email protected]>
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+Date: Fri, 19 Feb 2016 11:01:50 +0100
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+Subject: [PATCH] mac80211: add NEED_ALIGNED4_SKBS hw flag
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+
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+HW/driver should set NEED_ALIGNED4_SKBS flag in case
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+require aligned skbs to four-byte boundaries.
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+This affect only TX direction.
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+
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+Padding is added after ieee80211_hdr, before IV/LLC.
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+
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+Before we have to do memmove(hdrlen) twice in the
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+dirver. Once before we pass this to HW and next
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+in tx completion (to be sure monitor will report
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+this tx frame correctly).
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+
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+With this patch we can skip this memmove() and save CPU.
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+
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+Currently this was tested with ath9k, both hw/sw crypt for
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+wep/tkip/ccmp.
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+
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+Signed-off-by: Janusz Dziedzic <[email protected]>
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+---
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+
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+--- a/include/net/mac80211.h
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++++ b/include/net/mac80211.h
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+@@ -2014,6 +2014,9 @@ struct ieee80211_txq {
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+ * @IEEE80211_HW_TX_FRAG_LIST: Hardware (or driver) supports sending frag_list
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+ * skbs, needed for zero-copy software A-MSDU.
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+ *
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++ * @IEEE80211_HW_NEEDS_ALIGNED4_SKBS: Driver need aligned skbs to four-byte.
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++ * Padding will be added after ieee80211_hdr, before IV/LLC.
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++ *
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+ * @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
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+ */
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+ enum ieee80211_hw_flags {
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+@@ -2054,6 +2057,7 @@ enum ieee80211_hw_flags {
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+ IEEE80211_HW_USES_RSS,
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+ IEEE80211_HW_TX_AMSDU,
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+ IEEE80211_HW_TX_FRAG_LIST,
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++ IEEE80211_HW_NEEDS_ALIGNED4_SKBS,
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+
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+ /* keep last, obviously */
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+ NUM_IEEE80211_HW_FLAGS
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+--- a/net/mac80211/debugfs.c
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++++ b/net/mac80211/debugfs.c
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+@@ -302,6 +302,7 @@ static const char *hw_flag_names[] = {
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+ FLAG(USES_RSS),
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+ FLAG(TX_AMSDU),
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+ FLAG(TX_FRAG_LIST),
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++ FLAG(NEEDS_ALIGNED4_SKBS),
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+ #undef FLAG
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+ };
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+
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+--- a/net/mac80211/ieee80211_i.h
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++++ b/net/mac80211/ieee80211_i.h
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+@@ -1497,6 +1497,29 @@ ieee80211_have_rx_timestamp(struct ieee8
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+ return false;
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+ }
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+
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++static inline unsigned int
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++ieee80211_hdr_padsize(struct ieee80211_hw *hw, unsigned int hdrlen)
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++{
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++ /*
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++ * While hdrlen is already aligned to two-byte boundaries,
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++ * simple check with & 2 will return correct padsize.
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++ */
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++ if (ieee80211_hw_check(hw, NEEDS_ALIGNED4_SKBS))
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++ return hdrlen & 2;
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++ return 0;
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++}
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++
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++static inline unsigned int
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++ieee80211_padded_hdrlen(struct ieee80211_hw *hw, __le16 fc)
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++{
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++ unsigned int hdrlen;
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++
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++ hdrlen = ieee80211_hdrlen(fc);
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++ hdrlen += ieee80211_hdr_padsize(hw, hdrlen);
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++
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++ return hdrlen;
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++}
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++
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+ u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
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+ struct ieee80211_rx_status *status,
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+ unsigned int mpdu_len,
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+--- a/net/mac80211/sta_info.h
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++++ b/net/mac80211/sta_info.h
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+@@ -279,7 +279,7 @@ struct ieee80211_fast_tx {
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+ u8 hdr_len;
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+ u8 sa_offs, da_offs, pn_offs;
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+ u8 band;
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+- u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
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++ u8 hdr[30 + 2 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
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+ sizeof(rfc1042_header)] __aligned(2);
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+
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+ struct rcu_head rcu_head;
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+--- a/net/mac80211/status.c
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++++ b/net/mac80211/status.c
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+@@ -683,9 +683,22 @@ void ieee80211_tx_monitor(struct ieee802
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+ struct sk_buff *skb2;
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+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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+ struct ieee80211_sub_if_data *sdata;
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++ struct ieee80211_hdr *hdr = (void *)skb->data;
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+ struct net_device *prev_dev = NULL;
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++ unsigned int hdrlen, padsize;
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+ int rtap_len;
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+
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++ /* Remove padding if was added */
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++ if (ieee80211_hw_check(&local->hw, NEEDS_ALIGNED4_SKBS)) {
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++ hdrlen = ieee80211_hdrlen(hdr->frame_control);
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++ padsize = ieee80211_hdr_padsize(&local->hw, hdrlen);
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++
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++ if (padsize && skb->len > hdrlen + padsize) {
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++ memmove(skb->data + padsize, skb->data, hdrlen);
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++ skb_pull(skb, padsize);
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++ }
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++ }
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++
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+ /* send frame to monitor interfaces now */
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+ rtap_len = ieee80211_tx_radiotap_len(info);
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+ if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
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+--- a/net/mac80211/tkip.c
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++++ b/net/mac80211/tkip.c
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+@@ -201,10 +201,12 @@ void ieee80211_get_tkip_p2k(struct ieee8
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+ {
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+ struct ieee80211_key *key = (struct ieee80211_key *)
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+ container_of(keyconf, struct ieee80211_key, conf);
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++ struct ieee80211_hw *hw = &key->local->hw;
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+ const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
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+ struct tkip_ctx *ctx = &key->u.tkip.tx;
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+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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+- const u8 *data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
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++ const u8 *data = (u8 *)hdr + ieee80211_padded_hdrlen(hw,
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++ hdr->frame_control);
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+ u32 iv32 = get_unaligned_le32(&data[4]);
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+ u16 iv16 = data[2] | (data[0] << 8);
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+
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+--- a/net/mac80211/tx.c
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++++ b/net/mac80211/tx.c
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+@@ -1173,8 +1173,7 @@ ieee80211_tx_prepare(struct ieee80211_su
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+ info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
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+
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+ hdr = (struct ieee80211_hdr *) skb->data;
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+-
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+- tx->hdrlen = ieee80211_hdrlen(hdr->frame_control);
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++ tx->hdrlen = ieee80211_padded_hdrlen(&local->hw, hdr->frame_control);
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+
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+ if (likely(sta)) {
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+ if (!IS_ERR(sta))
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+@@ -2108,7 +2107,7 @@ netdev_tx_t ieee80211_monitor_start_xmit
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+ goto fail;
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+
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+ hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
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+- hdrlen = ieee80211_hdrlen(hdr->frame_control);
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++ hdrlen = ieee80211_padded_hdrlen(&local->hw, hdr->frame_control);
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+
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+ if (skb->len < len_rthdr + hdrlen)
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+ goto fail;
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+@@ -2334,7 +2333,7 @@ static struct sk_buff *ieee80211_build_h
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+ struct ieee80211_chanctx_conf *chanctx_conf;
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+ struct ieee80211_sub_if_data *ap_sdata;
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+ enum nl80211_band band;
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+- int ret;
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++ int padsize, ret;
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+
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+ if (IS_ERR(sta))
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+ sta = NULL;
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+@@ -2554,6 +2553,9 @@ static struct sk_buff *ieee80211_build_h
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+ hdrlen += 2;
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+ }
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+
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++ /* Check aligned4 skb required */
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++ padsize = ieee80211_hdr_padsize(&sdata->local->hw, hdrlen);
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++
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+ /*
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+ * Drop unicast frames to unauthorised stations unless they are
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+ * EAPOL frames from the local station.
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+@@ -2640,6 +2642,7 @@ static struct sk_buff *ieee80211_build_h
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+ h_pos -= skip_header_bytes;
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+
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+ head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
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++ head_need += padsize;
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+
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+ /*
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+ * So we need to modify the skb header and hence need a copy of
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+@@ -2678,6 +2681,9 @@ static struct sk_buff *ieee80211_build_h
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+ }
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+ #endif
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+
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++ if (padsize)
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++ memset(skb_push(skb, padsize), 0, padsize);
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++
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+ if (ieee80211_is_data_qos(fc)) {
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+ __le16 *qos_control;
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+
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+@@ -2691,8 +2697,8 @@ static struct sk_buff *ieee80211_build_h
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+ } else
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+ memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
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+
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+- nh_pos += hdrlen;
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+- h_pos += hdrlen;
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++ nh_pos += hdrlen + padsize;
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++ h_pos += hdrlen + padsize;
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+
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+ /* Update skb pointers to various headers since this modified frame
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+ * is going to go through Linux networking code that may potentially
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+@@ -2861,6 +2867,9 @@ void ieee80211_check_fast_xmit(struct st
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+ fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
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+ }
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+
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++ /* Check aligned4 skb required */
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++ build.hdr_len += ieee80211_hdr_padsize(&local->hw, build.hdr_len);
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++
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+ /* We store the key here so there's no point in using rcu_dereference()
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+ * but that's fine because the code that changes the pointers will call
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+ * this function after doing so. For a single CPU that would be enough,
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+--- a/net/mac80211/util.c
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++++ b/net/mac80211/util.c
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+@@ -1224,6 +1224,7 @@ void ieee80211_send_auth(struct ieee8021
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+ u32 tx_flags)
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+ {
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+ struct ieee80211_local *local = sdata->local;
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++ struct ieee80211_hw *hw = &local->hw;
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+ struct sk_buff *skb;
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+ struct ieee80211_mgmt *mgmt;
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+ unsigned int hdrlen;
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+@@ -1251,7 +1252,7 @@ void ieee80211_send_auth(struct ieee8021
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+ memcpy(skb_put(skb, extra_len), extra, extra_len);
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+
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+ if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
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+- hdrlen = ieee80211_hdrlen(mgmt->frame_control);
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++ hdrlen = ieee80211_padded_hdrlen(hw, mgmt->frame_control);
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+ mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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+ err = ieee80211_wep_encrypt(local, skb, hdrlen, key,
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+ key_len, key_idx);
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