rt2x00: Optimize TX descriptor handling
HT and no-HT rt2x00 devices use a partly different TX descriptor.
Optimize the tx desciptor memory layout by putting the PLCP and HT
substructs into a union and introduce a new driver flag to decide which
TX desciptor format is used by the device.
This saves us the expensive PLCP calculation fOr HT devices and the HT
descriptor setup on no-HT devices.
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index eebb564..7816c1c 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -270,12 +270,12 @@
* PLCP setup
* Length calculation depends on OFDM/CCK rate.
*/
- txdesc->signal = hwrate->plcp;
- txdesc->service = 0x04;
+ txdesc->u.plcp.signal = hwrate->plcp;
+ txdesc->u.plcp.service = 0x04;
if (hwrate->flags & DEV_RATE_OFDM) {
- txdesc->length_high = (data_length >> 6) & 0x3f;
- txdesc->length_low = data_length & 0x3f;
+ txdesc->u.plcp.length_high = (data_length >> 6) & 0x3f;
+ txdesc->u.plcp.length_low = data_length & 0x3f;
} else {
/*
* Convert length to microseconds.
@@ -290,18 +290,18 @@
* Check if we need to set the Length Extension
*/
if (hwrate->bitrate == 110 && residual <= 30)
- txdesc->service |= 0x80;
+ txdesc->u.plcp.service |= 0x80;
}
- txdesc->length_high = (duration >> 8) & 0xff;
- txdesc->length_low = duration & 0xff;
+ txdesc->u.plcp.length_high = (duration >> 8) & 0xff;
+ txdesc->u.plcp.length_low = duration & 0xff;
/*
* When preamble is enabled we should set the
* preamble bit for the signal.
*/
if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
- txdesc->signal |= 0x08;
+ txdesc->u.plcp.signal |= 0x08;
}
}
@@ -397,9 +397,12 @@
* Apply TX descriptor handling by components
*/
rt2x00crypto_create_tx_descriptor(entry, txdesc);
- rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
- rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
+
+ if (test_bit(DRIVER_REQUIRE_HT_TX_DESC, &rt2x00dev->flags))
+ rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
+ else
+ rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
}
static int rt2x00queue_write_tx_data(struct queue_entry *entry,