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rt2x00: Improve TX status entry validation

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The TX_STA_FIFO contains some information for identifying
a outgoing frame, however matching by WCID and ACK status is
not sufficient to 100% identify the macthing queue_entry structure
(containing the SKB buffer) which belongs to the status report.

Within TX_STA_FIFO we have a 4-bit field named PACKETID, which is
currently used to encode the queue id. The queue ID is however
limited to values from 0 to 3, which means 2 bits are sufficient
to encode the value. With the remaining 2 bits we can encode a
partial queue_entry index number. The value of PACKETID is not
allowed to become 0, with the queue ID ranging from 0 to 3, at least
one of the bits for the entry identification must be 1.

That leaves us with 3 possible values we can still encode in the
bits. Altough this doesn't allow 100% accurate matching of the
TX_STA_FIFO queue to a queue_entry structure, it at least improves
the accuracy. This allows us to better detect if we have missed the
TX_STA_FIFO report, which in turn reduces the number of watchdog
warnings regarding the TX status timeout.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn 2010-10-02 11:32:43 +02:00 committed by John W. Linville
parent ba3b9e5e8c
commit bc8a979e2d
2 changed files with 16 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/net/wireless/rt2x00/rt2800.h
View File

@ -1,5 +1,6 @@
/*
Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
Copyright (C) 2009 Alban Browaeys <prahal@yahoo.com>
Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
Copyright (C) 2009 Luis Correia <luis.f.correia@gmail.com>
@ -1353,6 +1354,9 @@
* 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).
* PID_QUEUE: Part of PID_TYPE, this is the queue index number (0-3)
* PID_ENTRY: Part of PID_TYPE, this is the queue entry index number (1-3)
* This identification number is calculated by ((idx % 3) + 1).
* 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)
@ -1364,6 +1368,8 @@
#define TX_STA_FIFO 0x1718
#define TX_STA_FIFO_VALID FIELD32(0x00000001)
#define TX_STA_FIFO_PID_TYPE FIELD32(0x0000001e)
#define TX_STA_FIFO_PID_QUEUE FIELD32(0x00000006)
#define TX_STA_FIFO_PID_ENTRY FIELD32(0x00000018)
#define TX_STA_FIFO_TX_SUCCESS FIELD32(0x00000020)
#define TX_STA_FIFO_TX_AGGRE FIELD32(0x00000040)
#define TX_STA_FIFO_TX_ACK_REQUIRED FIELD32(0x00000080)
@ -2024,6 +2030,10 @@ struct mac_iveiv_entry {
* frame was processed. If multiple frames are aggregated together
* (AMPDU==1) the reported tx status will always contain the packet
* id of the first frame. 0: Don't report tx status for this frame.
* PACKETID_QUEUE: Part of PACKETID, This is the queue index (0-3)
* PACKETID_ENTRY: Part of PACKETID, THis is the queue entry index (1-3)
* This identification number is calculated by ((idx % 3) + 1).
* The (+1) is required to prevent PACKETID to become 0.
*/
#define TXWI_W1_ACK FIELD32(0x00000001)
#define TXWI_W1_NSEQ FIELD32(0x00000002)
@ -2031,6 +2041,8 @@ struct mac_iveiv_entry {
#define TXWI_W1_WIRELESS_CLI_ID FIELD32(0x0000ff00)
#define TXWI_W1_MPDU_TOTAL_BYTE_COUNT FIELD32(0x0fff0000)
#define TXWI_W1_PACKETID FIELD32(0xf0000000)
#define TXWI_W1_PACKETID_QUEUE FIELD32(0x30000000)
#define TXWI_W1_PACKETID_ENTRY FIELD32(0xc0000000)
/*
* Word2

5
drivers/net/wireless/rt2x00/rt2800lib.c
View File

@ -483,7 +483,8 @@ void rt2800_write_tx_data(struct queue_entry *entry,
txdesc->key_idx : 0xff);
rt2x00_set_field32(&word, TXWI_W1_MPDU_TOTAL_BYTE_COUNT,
txdesc->length);
rt2x00_set_field32(&word, TXWI_W1_PACKETID, txdesc->qid + 1);
rt2x00_set_field32(&word, TXWI_W1_PACKETID_QUEUE, txdesc->qid);
rt2x00_set_field32(&word, TXWI_W1_PACKETID_ENTRY, (entry->entry_idx % 3) + 1);
rt2x00_desc_write(txwi, 1, word);
/*
@ -708,7 +709,7 @@ void rt2800_txdone(struct rt2x00_dev *rt2x00dev)
* Skip this entry when it contains an invalid
* queue identication number.
*/
pid = rt2x00_get_field32(reg, TX_STA_FIFO_PID_TYPE) - 1;
pid = rt2x00_get_field32(reg, TX_STA_FIFO_PID_QUEUE);
if (pid >= QID_RX)
continue;