From: Christian Lamparter Date: Sat, 6 Sep 2008 00:56:04 +0000 (+0200) Subject: p54: 32-bit tsf timestamps X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a0db663ff192e21ebb703f962308675f22fb38a8;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git p54: 32-bit tsf timestamps tcpdump: 02:15:42.874518 61112184us tsft 48.0 Mb/s 2437 MHz (0x0480) antenna 1 [0x0000000e] CF +QoS Data IV 02:15:42.874557 >>>4356079526us<<< tsft 24.0 Mb/s 2437 MHz (0x0480) antenna 1 [0x0000000e] Acknowledgment 02:15:42.976844 61214513us tsft 1.0 Mb/s 2437 MHz (0x0480) antenna 0 [0x0000000e] Beacon as one can see on the huge jump, it's very plausible that firmware does not report the full 64-bit mac time, just the lower 32bit and some kinds of flags... Therefore if we want a useful timestamp we have to emulate the high bits. Signed-off-by: Christian Lamparter Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/p54/p54.h b/drivers/net/wireless/p54/p54.h index 98d4f8e7d84d..36b8e584c6cf 100644 --- a/drivers/net/wireless/p54/p54.h +++ b/drivers/net/wireless/p54/p54.h @@ -87,6 +87,8 @@ struct p54_common { void *cached_vdcf; unsigned int fw_var; unsigned int fw_interface; + u32 tsf_low32; + u32 tsf_high32; struct ieee80211_tx_queue_stats tx_stats[8]; void *eeprom; struct completion eeprom_comp; diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c index f96f7c7e6af5..526d3a282b7a 100644 --- a/drivers/net/wireless/p54/p54common.c +++ b/drivers/net/wireless/p54/p54common.c @@ -426,10 +426,12 @@ EXPORT_SYMBOL_GPL(p54_parse_eeprom); static int p54_rx_data(struct ieee80211_hw *dev, struct sk_buff *skb) { + struct p54_common *priv = dev->priv; struct p54_rx_hdr *hdr = (struct p54_rx_hdr *) skb->data; struct ieee80211_rx_status rx_status = {0}; u16 freq = le16_to_cpu(hdr->freq); size_t header_len = sizeof(*hdr); + u32 tsf32; rx_status.signal = hdr->rssi; /* XX correct? */ @@ -438,7 +440,13 @@ static int p54_rx_data(struct ieee80211_hw *dev, struct sk_buff *skb) rx_status.freq = freq; rx_status.band = IEEE80211_BAND_2GHZ; rx_status.antenna = hdr->antenna; - rx_status.mactime = le64_to_cpu(hdr->timestamp); + + tsf32 = le32_to_cpu(hdr->tsf32); + if (tsf32 < priv->tsf_low32) + priv->tsf_high32++; + rx_status.mactime = ((u64)priv->tsf_high32) << 32 | tsf32; + priv->tsf_low32 = tsf32; + rx_status.flag |= RX_FLAG_TSFT; if (hdr->magic & cpu_to_le16(0x4000)) @@ -1037,6 +1045,7 @@ static void p54_stop(struct ieee80211_hw *dev) while ((skb = skb_dequeue(&priv->tx_queue))) kfree_skb(skb); priv->stop(dev); + priv->tsf_high32 = priv->tsf_low32 = 0; priv->mode = IEEE80211_IF_TYPE_INVALID; } diff --git a/drivers/net/wireless/p54/p54common.h b/drivers/net/wireless/p54/p54common.h index 73a9a2c923dd..976cbf9689b5 100644 --- a/drivers/net/wireless/p54/p54common.h +++ b/drivers/net/wireless/p54/p54common.h @@ -185,7 +185,8 @@ struct p54_rx_hdr { u8 rssi; u8 quality; u16 unknown2; - __le64 timestamp; + __le32 tsf32; + __le32 unalloc0; u8 align[0]; } __attribute__ ((packed));