diff options
Diffstat (limited to 'package/kernel/mac80211/patches/305-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/305-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/305-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch b/package/kernel/mac80211/patches/305-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch new file mode 100644 index 0000000000..508cc92411 --- /dev/null +++ b/package/kernel/mac80211/patches/305-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch @@ -0,0 +1,224 @@ +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 +@@ -2025,6 +2025,9 @@ struct ieee80211_txq { + * drivers, mac80211 packet loss mechanism will not be triggered and driver + * is completely depending on firmware event for station kickout. + * ++ * @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 { +@@ -2066,6 +2069,7 @@ enum ieee80211_hw_flags { + IEEE80211_HW_TX_AMSDU, + IEEE80211_HW_TX_FRAG_LIST, + IEEE80211_HW_REPORTS_LOW_ACK, ++ IEEE80211_HW_NEEDS_ALIGNED4_SKBS, + + /* keep last, obviously */ + NUM_IEEE80211_HW_FLAGS +--- a/net/mac80211/debugfs.c ++++ b/net/mac80211/debugfs.c +@@ -210,6 +210,7 @@ static const char *hw_flag_names[] = { + FLAG(TX_AMSDU), + FLAG(TX_FRAG_LIST), + FLAG(REPORTS_LOW_ACK), ++ FLAG(NEEDS_ALIGNED4_SKBS), + #undef FLAG + }; + +--- a/net/mac80211/ieee80211_i.h ++++ b/net/mac80211/ieee80211_i.h +@@ -1529,6 +1529,29 @@ ieee80211_have_rx_timestamp(struct ieee8 + return false; + } + ++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 +@@ -689,9 +689,22 @@ 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 +@@ -1206,8 +1206,7 @@ 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)) +@@ -2158,7 +2157,7 @@ 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; +@@ -2376,7 +2375,7 @@ 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; +@@ -2596,6 +2595,9 @@ 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. +@@ -2676,6 +2678,7 @@ 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 +@@ -2708,6 +2711,9 @@ 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; + +@@ -2883,6 +2889,9 @@ 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, +--- 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); |