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rt2x00: Optimize TX descriptor handling

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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>
This commit is contained in:
Helmut Schaa 2011-03-03 19:42:35 +01:00 • committed by John W. Linville
parent 7fe7ee7776
commit 26a1d07f41
12 changed files with 78 additions and 54 deletions
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10
drivers/net/wireless/rt2x00/rt2400pci.c
View file

@ -1131,19 +1131,21 @@ static void rt2400pci_write_tx_desc(struct queue_entry *entry,
rt2x00_desc_write(txd, 2, word);
rt2x00_desc_read(txd, 3, &word);
rt2x00_set_field32(&word, TXD_W3_PLCP_SIGNAL, txdesc->signal);
rt2x00_set_field32(&word, TXD_W3_PLCP_SIGNAL, txdesc->u.plcp.signal);
rt2x00_set_field32(&word, TXD_W3_PLCP_SIGNAL_REGNUM, 5);
rt2x00_set_field32(&word, TXD_W3_PLCP_SIGNAL_BUSY, 1);
rt2x00_set_field32(&word, TXD_W3_PLCP_SERVICE, txdesc->service);
rt2x00_set_field32(&word, TXD_W3_PLCP_SERVICE, txdesc->u.plcp.service);
rt2x00_set_field32(&word, TXD_W3_PLCP_SERVICE_REGNUM, 6);
rt2x00_set_field32(&word, TXD_W3_PLCP_SERVICE_BUSY, 1);
rt2x00_desc_write(txd, 3, word);
rt2x00_desc_read(txd, 4, &word);
rt2x00_set_field32(&word, TXD_W4_PLCP_LENGTH_LOW, txdesc->length_low);
rt2x00_set_field32(&word, TXD_W4_PLCP_LENGTH_LOW,
txdesc->u.plcp.length_low);
rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_LOW_REGNUM, 8);
rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_LOW_BUSY, 1);
rt2x00_set_field32(&word, TXD_W4_PLCP_LENGTH_HIGH, txdesc->length_high);
rt2x00_set_field32(&word, TXD_W4_PLCP_LENGTH_HIGH,
txdesc->u.plcp.length_high);
rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_HIGH_REGNUM, 7);
rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_HIGH_BUSY, 1);
rt2x00_desc_write(txd, 4, word);