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mac80211: support RX_FLAG_MACTIME_END 

Allow drivers to indicate their mactime is at RX completion and adjust
for this in mac80211. Also rename the existing RX_FLAG_MACTIME_MPDU to
RX_FLAG_MACTIME_START to clarify its intent. Based on similar code by
Johannes Berg.

Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
[fix docs, atheros drivers]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Thomas Pedersen 2012-11-13 10:46:27 -08:00 committed by Johannes Berg
parent 2a91c9f781
commit f4bda337bb
23 changed files with 108 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/ath/ath5k/base.c
View File

@ -1349,7 +1349,7 @@ ath5k_receive_frame(struct ath5k_hw *ah, struct sk_buff *skb,
* right now, so it's not too bad...
*/
rxs->mactime = ath5k_extend_tsf(ah, rs->rs_tstamp);
rxs->flag |= RX_FLAG_MACTIME_MPDU;
rxs->flag |= RX_FLAG_MACTIME_START;
rxs->freq = ah->curchan->center_freq;
rxs->band = ah->curchan->band;

2
drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
View File

@ -1082,7 +1082,7 @@ static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
rx_status->freq = hw->conf.channel->center_freq;
rx_status->signal = rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
rx_status->antenna = rxbuf->rxstatus.rs_antenna;
rx_status->flag |= RX_FLAG_MACTIME_MPDU;
rx_status->flag |= RX_FLAG_MACTIME_START;
return true;

2
drivers/net/wireless/ath/ath9k/recv.c
View File

@ -976,7 +976,7 @@ static int ath9k_rx_skb_preprocess(struct ath_common *common,
rx_status->freq = hw->conf.channel->center_freq;
rx_status->signal = ah->noise + rx_stats->rs_rssi;
rx_status->antenna = rx_stats->rs_antenna;
rx_status->flag |= RX_FLAG_MACTIME_MPDU;
rx_status->flag |= RX_FLAG_MACTIME_START;
if (rx_stats->rs_moreaggr)
rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;

2
drivers/net/wireless/b43/xmit.c
View File

@ -796,7 +796,7 @@ void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
status.mactime += mactime;
if (low_mactime_now <= mactime)
status.mactime -= 0x10000;
status.flag |= RX_FLAG_MACTIME_MPDU;
status.flag |= RX_FLAG_MACTIME_START;
}
chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;

2
drivers/net/wireless/b43legacy/xmit.c
View File

@ -557,7 +557,7 @@ void b43legacy_rx(struct b43legacy_wldev *dev,
status.mactime += mactime;
if (low_mactime_now <= mactime)
status.mactime -= 0x10000;
status.flag |= RX_FLAG_MACTIME_MPDU;
status.flag |= RX_FLAG_MACTIME_START;
}
chanid = (chanstat & B43legacy_RX_CHAN_ID) >>

2
drivers/net/wireless/brcm80211/brcmsmac/main.c
View File

@ -7508,7 +7508,7 @@ prep_mac80211_status(struct brcms_c_info *wlc, struct d11rxhdr *rxh,
/* fill in TSF and flag its presence */
rx_status->mactime = brcms_c_recover_tsf64(wlc, rxh);
rx_status->flag |= RX_FLAG_MACTIME_MPDU;
rx_status->flag |= RX_FLAG_MACTIME_START;
channel = BRCMS_CHAN_CHANNEL(rxh->RxChan);

2
drivers/net/wireless/iwlegacy/4965-mac.c
View File

@ -686,7 +686,7 @@ il4965_hdl_rx(struct il_priv *il, struct il_rx_buf *rxb)
/* TSF isn't reliable. In order to allow smooth user experience,
* this W/A doesn't propagate it to the mac80211 */
/*rx_status.flag |= RX_FLAG_MACTIME_MPDU; */
/*rx_status.flag |= RX_FLAG_MACTIME_START; */
il->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);

2
drivers/net/wireless/iwlwifi/dvm/rx.c
View File

@ -951,7 +951,7 @@ static int iwlagn_rx_reply_rx(struct iwl_priv *priv,
/* TSF isn't reliable. In order to allow smooth user experience,
* this W/A doesn't propagate it to the mac80211 */
/*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
/*rx_status.flag |= RX_FLAG_MACTIME_START;*/
priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);

2
drivers/net/wireless/mac80211_hwsim.c
View File

@ -699,7 +699,7 @@ static bool mac80211_hwsim_tx_frame_no_nl(struct ieee80211_hw *hw,
struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
memset(&rx_status, 0, sizeof(rx_status));
rx_status.flag |= RX_FLAG_MACTIME_MPDU;
rx_status.flag |= RX_FLAG_MACTIME_START;
rx_status.freq = chan->center_freq;
rx_status.band = chan->band;
rx_status.rate_idx = info->control.rates[0].idx;

2
drivers/net/wireless/p54/txrx.c
View File

@ -369,7 +369,7 @@ static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32;
priv->tsf_low32 = tsf32;
rx_status->flag |= RX_FLAG_MACTIME_MPDU;
rx_status->flag |= RX_FLAG_MACTIME_START;
if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
header_len += hdr->align[0];

2
drivers/net/wireless/rtl818x/rtl8180/dev.c
View File

@ -150,7 +150,7 @@ static void rtl8180_handle_rx(struct ieee80211_hw *dev)
rx_status.freq = dev->conf.channel->center_freq;
rx_status.band = dev->conf.channel->band;
rx_status.mactime = le64_to_cpu(entry->tsft);
rx_status.flag |= RX_FLAG_MACTIME_MPDU;
rx_status.flag |= RX_FLAG_MACTIME_START;
if (flags & RTL818X_RX_DESC_FLAG_CRC32_ERR)
rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;

2
drivers/net/wireless/rtl818x/rtl8187/dev.c
View File

@ -381,7 +381,7 @@ static void rtl8187_rx_cb(struct urb *urb)
rx_status.rate_idx = rate;
rx_status.freq = dev->conf.channel->center_freq;
rx_status.band = dev->conf.channel->band;
rx_status.flag |= RX_FLAG_MACTIME_MPDU;
rx_status.flag |= RX_FLAG_MACTIME_START;
if (flags & RTL818X_RX_DESC_FLAG_CRC32_ERR)
rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));

2
drivers/net/wireless/rtlwifi/rtl8192ce/trx.c
View File

@ -567,7 +567,7 @@ bool rtl92ce_rx_query_desc(struct ieee80211_hw *hw,
if (GET_RX_DESC_RXHT(pdesc))
rx_status->flag |= RX_FLAG_HT;
rx_status->flag |= RX_FLAG_MACTIME_MPDU;
rx_status->flag |= RX_FLAG_MACTIME_START;
if (stats->decrypted)
rx_status->flag |= RX_FLAG_DECRYPTED;

2
drivers/net/wireless/rtlwifi/rtl8192cu/trx.c
View File

@ -334,7 +334,7 @@ bool rtl92cu_rx_query_desc(struct ieee80211_hw *hw,
rx_status->flag |= RX_FLAG_40MHZ;
if (GET_RX_DESC_RX_HT(pdesc))
rx_status->flag |= RX_FLAG_HT;
rx_status->flag |= RX_FLAG_MACTIME_MPDU;
rx_status->flag |= RX_FLAG_MACTIME_START;
if (stats->decrypted)
rx_status->flag |= RX_FLAG_DECRYPTED;
rx_status->rate_idx = rtlwifi_rate_mapping(hw,

2
drivers/net/wireless/rtlwifi/rtl8192de/trx.c
View File

@ -514,7 +514,7 @@ bool rtl92de_rx_query_desc(struct ieee80211_hw *hw, struct rtl_stats *stats,
rx_status->flag |= RX_FLAG_40MHZ;
if (GET_RX_DESC_RXHT(pdesc))
rx_status->flag |= RX_FLAG_HT;
rx_status->flag |= RX_FLAG_MACTIME_MPDU;
rx_status->flag |= RX_FLAG_MACTIME_START;
if (stats->decrypted)
rx_status->flag |= RX_FLAG_DECRYPTED;
rx_status->rate_idx = rtlwifi_rate_mapping(hw,

2
drivers/net/wireless/rtlwifi/rtl8192se/trx.c
View File

@ -554,7 +554,7 @@ bool rtl92se_rx_query_desc(struct ieee80211_hw *hw, struct rtl_stats *stats,
if (stats->is_ht)
rx_status->flag |= RX_FLAG_HT;
rx_status->flag |= RX_FLAG_MACTIME_MPDU;
rx_status->flag |= RX_FLAG_MACTIME_START;
/* hw will set stats->decrypted true, if it finds the
* frame is open data frame or mgmt frame,

2
drivers/net/wireless/ti/wl1251/rx.c
View File

@ -81,7 +81,7 @@ static void wl1251_rx_status(struct wl1251 *wl,
status->freq = ieee80211_channel_to_frequency(desc->channel,
status->band);
status->flag |= RX_FLAG_MACTIME_MPDU;
status->flag |= RX_FLAG_MACTIME_START;
if (desc->flags & RX_DESC_ENCRYPTION_MASK) {
status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;

8
include/net/mac80211.h
View File

@ -711,10 +711,13 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
* the frame.
* @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on
* the frame.
* @RX_FLAG_MACTIME_MPDU: The timestamp passed in the RX status (@mactime
* @RX_FLAG_MACTIME_START: The timestamp passed in the RX status (@mactime
* field) is valid and contains the time the first symbol of the MPDU
* was received. This is useful in monitor mode and for proper IBSS
* merging.
* @RX_FLAG_MACTIME_END: The timestamp passed in the RX status (@mactime
* field) is valid and contains the time the last symbol of the MPDU
* (including FCS) was received.
* @RX_FLAG_SHORTPRE: Short preamble was used for this frame
* @RX_FLAG_HT: HT MCS was used and rate_idx is MCS index
* @RX_FLAG_40MHZ: HT40 (40 MHz) was used
@ -745,7 +748,7 @@ enum mac80211_rx_flags {
RX_FLAG_IV_STRIPPED = BIT(4),
RX_FLAG_FAILED_FCS_CRC = BIT(5),
RX_FLAG_FAILED_PLCP_CRC = BIT(6),
RX_FLAG_MACTIME_MPDU = BIT(7),
RX_FLAG_MACTIME_START = BIT(7),
RX_FLAG_SHORTPRE = BIT(8),
RX_FLAG_HT = BIT(9),
RX_FLAG_40MHZ = BIT(10),
@ -759,6 +762,7 @@ enum mac80211_rx_flags {
RX_FLAG_AMPDU_IS_LAST = BIT(18),
RX_FLAG_AMPDU_DELIM_CRC_ERROR = BIT(19),
RX_FLAG_AMPDU_DELIM_CRC_KNOWN = BIT(20),
RX_FLAG_MACTIME_END = BIT(21),
};
/**

29
net/mac80211/ibss.c
View File

@ -543,30 +543,11 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
goto put_bss;
if (rx_status->flag & RX_FLAG_MACTIME_MPDU) {
/*
* For correct IBSS merging we need mactime; since mactime is
* defined as the time the first data symbol of the frame hits
* the PHY, and the timestamp of the beacon is defined as "the
* time that the data symbol containing the first bit of the
* timestamp is transmitted to the PHY plus the transmitting
* STA's delays through its local PHY from the MAC-PHY
* interface to its interface with the WM" (802.11 11.1.2)
* - equals the time this bit arrives at the receiver - we have
* to take into account the offset between the two.
*
* E.g. at 1 MBit that means mactime is 192 usec earlier
* (=24 bytes * 8 usecs/byte) than the beacon timestamp.
*/
int rate;
if (rx_status->flag & RX_FLAG_HT)
rate = 65; /* TODO: HT rates */
else
rate = local->hw.wiphy->bands[band]->
bitrates[rx_status->rate_idx].bitrate;
rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
if (ieee80211_have_rx_timestamp(rx_status)) {
/* time when timestamp field was received */
rx_timestamp =
ieee80211_calculate_rx_timestamp(local, rx_status,
len + FCS_LEN, 24);
} else {
/*
* second best option: get current TSF

11
net/mac80211/ieee80211_i.h
View File

@ -1259,7 +1259,18 @@ static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
is_broadcast_ether_addr(raddr);
}
static inline bool
ieee80211_have_rx_timestamp(struct ieee80211_rx_status *status)
{
WARN_ON_ONCE(status->flag & RX_FLAG_MACTIME_START &&
status->flag & RX_FLAG_MACTIME_END);
return status->flag & (RX_FLAG_MACTIME_START | RX_FLAG_MACTIME_END);
}
u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
struct ieee80211_rx_status *status,
unsigned int mpdu_len,
unsigned int mpdu_offset);
int ieee80211_hw_config(struct ieee80211_local *local, u32 changed);
void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx);
void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,

44
net/mac80211/mesh_sync.c
View File

@ -116,43 +116,13 @@ static void mesh_sync_offset_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
goto no_sync;
}
if (rx_status->flag & RX_FLAG_MACTIME_MPDU && rx_status->mactime) {
/*
* The mactime is defined as the time the first data symbol
* of the frame hits the PHY, and the timestamp of the beacon
* is defined as "the time that the data symbol containing the
* first bit of the timestamp is transmitted to the PHY plus
* the transmitting STA's delays through its local PHY from the
* MAC-PHY interface to its interface with the WM" (802.11
* 11.1.2)
*
* T_r, in 13.13.2.2.2, is just defined as "the frame reception
* time" but we unless we interpret that time to be the same
* time of the beacon timestamp, the offset calculation will be
* off. Below we adjust t_r to be "the time at which the first
* symbol of the timestamp element in the beacon is received".
* This correction depends on the rate.
*
* Based on similar code in ibss.c
*/
int rate;
if (rx_status->flag & RX_FLAG_HT) {
/* TODO:
* In principle there could be HT-beacons (Dual Beacon
* HT Operation options), but for now ignore them and
* just use the primary (i.e. non-HT) beacons for
* synchronization.
* */
goto no_sync;
} else
rate = local->hw.wiphy->bands[rx_status->band]->
bitrates[rx_status->rate_idx].bitrate;
/* 24 bytes of header * 8 bits/byte *
* 10*(100 Kbps)/Mbps / rate (100 Kbps)*/
t_r = rx_status->mactime + (24 * 8 * 10 / rate);
}
if (ieee80211_have_rx_timestamp(rx_status))
/* time when timestamp field was received */
t_r = ieee80211_calculate_rx_timestamp(local, rx_status,
24 + 12 +
elems->total_len +
FCS_LEN,
24);
/* Timing offset calculation (see 13.13.2.2.2) */
t_t = le64_to_cpu(mgmt->u.beacon.timestamp);

14
net/mac80211/rx.c
View File

@ -81,7 +81,7 @@ ieee80211_rx_radiotap_len(struct ieee80211_local *local,
/* always present fields */
len = sizeof(struct ieee80211_radiotap_header) + 9;
if (status->flag & RX_FLAG_MACTIME_MPDU)
if (ieee80211_have_rx_timestamp(status))
len += 8;
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
len += 1;
@ -117,6 +117,11 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
struct ieee80211_radiotap_header *rthdr;
unsigned char *pos;
u16 rx_flags = 0;
int mpdulen;
mpdulen = skb->len;
if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
mpdulen += FCS_LEN;
rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
memset(rthdr, 0, rtap_len);
@ -134,8 +139,11 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
/* the order of the following fields is important */
/* IEEE80211_RADIOTAP_TSFT */
if (status->flag & RX_FLAG_MACTIME_MPDU) {
put_unaligned_le64(status->mactime, pos);
if (ieee80211_have_rx_timestamp(status)) {
put_unaligned_le64(
ieee80211_calculate_rx_timestamp(local, status,
mpdulen, 0),
pos);
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
pos += 8;
}

51
net/mac80211/util.c
View File

@ -2013,3 +2013,54 @@ u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
return 2;
return 1;
}
/**
* ieee80211_calculate_rx_timestamp - calculate timestamp in frame
* @local: mac80211 hw info struct
* @status: RX status
* @mpdu_len: total MPDU length (including FCS)
* @mpdu_offset: offset into MPDU to calculate timestamp at
*
* This function calculates the RX timestamp at the given MPDU offset, taking
* into account what the RX timestamp was. An offset of 0 will just normalize
* the timestamp to TSF at beginning of MPDU reception.
*/
u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
struct ieee80211_rx_status *status,
unsigned int mpdu_len,
unsigned int mpdu_offset)
{
u64 ts = status->mactime;
struct rate_info ri;
u16 rate;
if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
return 0;
memset(&ri, 0, sizeof(ri));
/* Fill cfg80211 rate info */
if (status->flag & RX_FLAG_HT) {
ri.mcs = status->rate_idx;
ri.flags |= RATE_INFO_FLAGS_MCS;
if (status->flag & RX_FLAG_40MHZ)
ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
if (status->flag & RX_FLAG_SHORT_GI)
ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
} else {
struct ieee80211_supported_band *sband;
sband = local->hw.wiphy->bands[status->band];
ri.legacy = sband->bitrates[status->rate_idx].bitrate;
}
rate = cfg80211_calculate_bitrate(&ri);
/* rewind from end of MPDU */
if (status->flag & RX_FLAG_MACTIME_END)
ts -= mpdu_len * 8 * 10 / rate;
ts += mpdu_offset * 8 * 10 / rate;
return ts;
}