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rt2x00: Update comments regarding TXWI and TX_STA_FIFO

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Add some comments about the TXWI fields and the TX_STA_FIFO register.
Especially describe the relationship between the TXWI field PACKETID
and the PID field in the TX_STA_FIFO register.

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 2010-08-06 20:48:27 +02:00 committed by John W. Linville
parent 96481b20f4
commit 0856d9c04a
1 changed files with 26 additions and 1 deletions
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27
drivers/net/wireless/rt2x00/rt2800.h
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@ -1318,7 +1318,25 @@
#define TX_STA_CNT2_TX_UNDER_FLOW_COUNT FIELD32(0xffff0000)
/*
* TX_STA_FIFO: TX Result for specific PID status fifo register
* TX_STA_FIFO: TX Result for specific PID status fifo register.
*
* This register is implemented as FIFO with 16 entries in the HW. Each
* register read fetches the next tx result. If the FIFO is full because
* it wasn't read fast enough after the according interrupt (TX_FIFO_STATUS)
* triggered, the hw seems to simply drop further tx results.
*
* VALID: 1: this tx result is valid
* 0: no valid tx result -> driver should stop reading
* PID_TYPE: The PID latched from the PID field in the TXWI, can be used
* to match a frame with its tx result (even though the PID is
* only 4 bits wide).
* TX_SUCCESS: Indicates tx success (1) or failure (0)
* TX_AGGRE: Indicates if the frame was part of an aggregate (1) or not (0)
* TX_ACK_REQUIRED: Indicates if the frame needed to get ack'ed (1) or not (0)
* WCID: The wireless client ID.
* MCS: The tx rate used during the last transmission of this frame, be it
* successful or not.
* PHYMODE: The phymode used for the transmission.
*/
#define TX_STA_FIFO 0x1718
#define TX_STA_FIFO_VALID FIELD32(0x00000001)
@ -1945,6 +1963,13 @@ struct mac_iveiv_entry {
/*
* Word1
* ACK: 0: No Ack needed, 1: Ack needed
* NSEQ: 0: Don't assign hw sequence number, 1: Assign hw sequence number
* BW_WIN_SIZE: BA windows size of the recipient
* WIRELESS_CLI_ID: Client ID for WCID table access
* MPDU_TOTAL_BYTE_COUNT: Length of 802.11 frame
* PACKETID: Will be latched into the TX_STA_FIFO register once the according
* frame was processed. 0: Don't report tx status for this frame.
*/
#define TXWI_W1_ACK FIELD32(0x00000001)
#define TXWI_W1_NSEQ FIELD32(0x00000002)