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authorFelix Fietkau <nbd@nbd.name>2017-02-02 12:02:22 +0100
committerFelix Fietkau <nbd@nbd.name>2017-02-06 12:27:12 +0100
commit649e766a64a0d001f040dfc225c601b3d0af6f40 (patch)
tree6399891552e85e9d511546df07932551f60b7549 /package/kernel/mac80211/patches/308-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch
parent91fce81df6e99cec0876b9d4866bd86e7c49820f (diff)
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mac80211: update to wireless-testing 2017-01-31
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'package/kernel/mac80211/patches/308-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch')
-rw-r--r--package/kernel/mac80211/patches/308-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch233
1 files changed, 233 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/308-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch b/package/kernel/mac80211/patches/308-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch
new file mode 100644
index 0000000000..43455773f1
--- /dev/null
+++ b/package/kernel/mac80211/patches/308-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch
@@ -0,0 +1,233 @@
+From: Janusz Dziedzic <janusz.dziedzic@tieto.com>
+Date: Fri, 19 Feb 2016 11:01:50 +0100
+Subject: [PATCH] mac80211: add NEED_ALIGNED4_SKBS hw flag
+
+HW/driver should set NEED_ALIGNED4_SKBS flag in case
+require aligned skbs to four-byte boundaries.
+This affect only TX direction.
+
+Padding is added after ieee80211_hdr, before IV/LLC.
+
+Before we have to do memmove(hdrlen) twice in the
+dirver. Once before we pass this to HW and next
+in tx completion (to be sure monitor will report
+this tx frame correctly).
+
+With this patch we can skip this memmove() and save CPU.
+
+Currently this was tested with ath9k, both hw/sw crypt for
+wep/tkip/ccmp.
+
+Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
+---
+
+--- a/include/net/mac80211.h
++++ b/include/net/mac80211.h
+@@ -2043,6 +2043,9 @@ struct ieee80211_txq {
+ * The stack will not do fragmentation.
+ * The callback for @set_frag_threshold should be set as well.
+ *
++ * @IEEE80211_HW_NEEDS_ALIGNED4_SKBS: Driver need aligned skbs to four-byte.
++ * Padding will be added after ieee80211_hdr, before IV/LLC.
++ *
+ * @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
+ */
+ enum ieee80211_hw_flags {
+@@ -2085,6 +2088,7 @@ enum ieee80211_hw_flags {
+ IEEE80211_HW_TX_FRAG_LIST,
+ IEEE80211_HW_REPORTS_LOW_ACK,
+ IEEE80211_HW_SUPPORTS_TX_FRAG,
++ IEEE80211_HW_NEEDS_ALIGNED4_SKBS,
+
+ /* keep last, obviously */
+ NUM_IEEE80211_HW_FLAGS
+--- a/net/mac80211/debugfs.c
++++ b/net/mac80211/debugfs.c
+@@ -211,6 +211,7 @@ static const char *hw_flag_names[] = {
+ FLAG(TX_FRAG_LIST),
+ FLAG(REPORTS_LOW_ACK),
+ FLAG(SUPPORTS_TX_FRAG),
++ FLAG(NEEDS_ALIGNED4_SKBS),
+ #undef FLAG
+ };
+
+--- a/net/mac80211/ieee80211_i.h
++++ b/net/mac80211/ieee80211_i.h
+@@ -1553,6 +1553,29 @@ ieee80211_vif_get_num_mcast_if(struct ie
+ return -1;
+ }
+
++static inline unsigned int
++ieee80211_hdr_padsize(struct ieee80211_hw *hw, unsigned int hdrlen)
++{
++ /*
++ * While hdrlen is already aligned to two-byte boundaries,
++ * simple check with & 2 will return correct padsize.
++ */
++ if (ieee80211_hw_check(hw, NEEDS_ALIGNED4_SKBS))
++ return hdrlen & 2;
++ return 0;
++}
++
++static inline unsigned int
++ieee80211_padded_hdrlen(struct ieee80211_hw *hw, __le16 fc)
++{
++ unsigned int hdrlen;
++
++ hdrlen = ieee80211_hdrlen(fc);
++ hdrlen += ieee80211_hdr_padsize(hw, hdrlen);
++
++ return hdrlen;
++}
++
+ u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
+ struct ieee80211_rx_status *status,
+ unsigned int mpdu_len,
+--- a/net/mac80211/sta_info.h
++++ b/net/mac80211/sta_info.h
+@@ -282,7 +282,7 @@ struct ieee80211_fast_tx {
+ u8 hdr_len;
+ u8 sa_offs, da_offs, pn_offs;
+ u8 band;
+- u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
++ u8 hdr[30 + 2 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
+ sizeof(rfc1042_header)] __aligned(2);
+
+ struct rcu_head rcu_head;
+--- a/net/mac80211/status.c
++++ b/net/mac80211/status.c
+@@ -693,9 +693,22 @@ void ieee80211_tx_monitor(struct ieee802
+ struct sk_buff *skb2;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_sub_if_data *sdata;
++ struct ieee80211_hdr *hdr = (void *)skb->data;
+ struct net_device *prev_dev = NULL;
++ unsigned int hdrlen, padsize;
+ int rtap_len;
+
++ /* Remove padding if was added */
++ if (ieee80211_hw_check(&local->hw, NEEDS_ALIGNED4_SKBS)) {
++ hdrlen = ieee80211_hdrlen(hdr->frame_control);
++ padsize = ieee80211_hdr_padsize(&local->hw, hdrlen);
++
++ if (padsize && skb->len > hdrlen + padsize) {
++ memmove(skb->data + padsize, skb->data, hdrlen);
++ skb_pull(skb, padsize);
++ }
++ }
++
+ /* send frame to monitor interfaces now */
+ rtap_len = ieee80211_tx_radiotap_len(info);
+ if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
+--- a/net/mac80211/tkip.c
++++ b/net/mac80211/tkip.c
+@@ -201,10 +201,12 @@ void ieee80211_get_tkip_p2k(struct ieee8
+ {
+ struct ieee80211_key *key = (struct ieee80211_key *)
+ container_of(keyconf, struct ieee80211_key, conf);
++ struct ieee80211_hw *hw = &key->local->hw;
+ const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
+ struct tkip_ctx *ctx = &key->u.tkip.tx;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+- const u8 *data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
++ const u8 *data = (u8 *)hdr + ieee80211_padded_hdrlen(hw,
++ hdr->frame_control);
+ u32 iv32 = get_unaligned_le32(&data[4]);
+ u16 iv16 = data[2] | (data[0] << 8);
+
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -1176,8 +1176,7 @@ ieee80211_tx_prepare(struct ieee80211_su
+ info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
+
+ hdr = (struct ieee80211_hdr *) skb->data;
+-
+- tx->hdrlen = ieee80211_hdrlen(hdr->frame_control);
++ tx->hdrlen = ieee80211_padded_hdrlen(&local->hw, hdr->frame_control);
+
+ if (likely(sta)) {
+ if (!IS_ERR(sta))
+@@ -2152,7 +2151,7 @@ netdev_tx_t ieee80211_monitor_start_xmit
+ goto fail;
+
+ hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
+- hdrlen = ieee80211_hdrlen(hdr->frame_control);
++ hdrlen = ieee80211_padded_hdrlen(&local->hw, hdr->frame_control);
+
+ if (skb->len < len_rthdr + hdrlen)
+ goto fail;
+@@ -2370,7 +2369,7 @@ static struct sk_buff *ieee80211_build_h
+ struct ieee80211_chanctx_conf *chanctx_conf;
+ struct ieee80211_sub_if_data *ap_sdata;
+ enum nl80211_band band;
+- int ret;
++ int padsize, ret;
+
+ if (IS_ERR(sta))
+ sta = NULL;
+@@ -2590,6 +2589,9 @@ static struct sk_buff *ieee80211_build_h
+ hdrlen += 2;
+ }
+
++ /* Check aligned4 skb required */
++ padsize = ieee80211_hdr_padsize(&sdata->local->hw, hdrlen);
++
+ /*
+ * Drop unicast frames to unauthorised stations unless they are
+ * EAPOL frames from the local station.
+@@ -2670,6 +2672,7 @@ static struct sk_buff *ieee80211_build_h
+
+ skb_pull(skb, skip_header_bytes);
+ head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
++ head_need += padsize;
+
+ /*
+ * So we need to modify the skb header and hence need a copy of
+@@ -2702,6 +2705,9 @@ static struct sk_buff *ieee80211_build_h
+ memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
+ #endif
+
++ if (padsize)
++ memset(skb_push(skb, padsize), 0, padsize);
++
+ if (ieee80211_is_data_qos(fc)) {
+ __le16 *qos_control;
+
+@@ -2877,6 +2883,9 @@ void ieee80211_check_fast_xmit(struct st
+ fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
+ }
+
++ /* Check aligned4 skb required */
++ build.hdr_len += ieee80211_hdr_padsize(&local->hw, build.hdr_len);
++
+ /* We store the key here so there's no point in using rcu_dereference()
+ * but that's fine because the code that changes the pointers will call
+ * this function after doing so. For a single CPU that would be enough,
+@@ -3464,7 +3473,7 @@ begin:
+
+ if (tx.key &&
+ (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
+- pn_offs = ieee80211_hdrlen(hdr->frame_control);
++ pn_offs = tx.hdrlen;
+
+ ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
+ tx.key, skb);
+--- a/net/mac80211/util.c
++++ b/net/mac80211/util.c
+@@ -1225,6 +1225,7 @@ void ieee80211_send_auth(struct ieee8021
+ u32 tx_flags)
+ {
+ struct ieee80211_local *local = sdata->local;
++ struct ieee80211_hw *hw = &local->hw;
+ struct sk_buff *skb;
+ struct ieee80211_mgmt *mgmt;
+ unsigned int hdrlen;
+@@ -1252,7 +1253,7 @@ void ieee80211_send_auth(struct ieee8021
+ memcpy(skb_put(skb, extra_len), extra, extra_len);
+
+ if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
+- hdrlen = ieee80211_hdrlen(mgmt->frame_control);
++ hdrlen = ieee80211_padded_hdrlen(hw, mgmt->frame_control);
+ mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
+ err = ieee80211_wep_encrypt(local, skb, hdrlen, key,
+ key_len, key_idx);