redonkable/alistair23-linux
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rt2x00: Optimize get_duration / get_duration_res

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We can optimize get_duration and get_duration_res
by making them a macro. They are really simple
calculation handlers so this doesn't matter much.

Often (especially in rt2400pci and rt2500pci,
the arguments are hardcoded, and the result value
is passed into other hardcoded values.

By making the functions a macro GCC can
optimize the entire thing much better.

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 2008-11-09 20:47:00 +01:00 committed by John W. Linville
parent 87c1687d1a
commit bad13639a3
6 changed files with 27 additions and 34 deletions
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10
drivers/net/wireless/rt2x00/rt2400pci.c
View file

@ -322,7 +322,7 @@ static void rt2400pci_config_intf(struct rt2x00_dev *rt2x00dev,
/*
* Enable beacon config
*/
bcn_preload = PREAMBLE + get_duration(IEEE80211_HEADER, 20);
bcn_preload = PREAMBLE + GET_DURATION(IEEE80211_HEADER, 20);
rt2x00pci_register_read(rt2x00dev, BCNCSR1, &reg);
rt2x00_set_field32(&reg, BCNCSR1_PRELOAD, bcn_preload);
rt2x00pci_register_write(rt2x00dev, BCNCSR1, reg);
@ -367,25 +367,25 @@ static void rt2400pci_config_erp(struct rt2x00_dev *rt2x00dev,
rt2x00pci_register_read(rt2x00dev, ARCSR2, &reg);
rt2x00_set_field32(&reg, ARCSR2_SIGNAL, 0x00);
rt2x00_set_field32(&reg, ARCSR2_SERVICE, 0x04);
rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 10));
rt2x00_set_field32(&reg, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 10));
rt2x00pci_register_write(rt2x00dev, ARCSR2, reg);
rt2x00pci_register_read(rt2x00dev, ARCSR3, &reg);
rt2x00_set_field32(&reg, ARCSR3_SIGNAL, 0x01 | preamble_mask);
rt2x00_set_field32(&reg, ARCSR3_SERVICE, 0x04);
rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 20));
rt2x00_set_field32(&reg, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 20));
rt2x00pci_register_write(rt2x00dev, ARCSR3, reg);
rt2x00pci_register_read(rt2x00dev, ARCSR4, &reg);
rt2x00_set_field32(&reg, ARCSR4_SIGNAL, 0x02 | preamble_mask);
rt2x00_set_field32(&reg, ARCSR4_SERVICE, 0x04);
rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 55));
rt2x00_set_field32(&reg, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 55));
rt2x00pci_register_write(rt2x00dev, ARCSR4, reg);
rt2x00pci_register_read(rt2x00dev, ARCSR5, &reg);
rt2x00_set_field32(&reg, ARCSR5_SIGNAL, 0x03 | preamble_mask);
rt2x00_set_field32(&reg, ARCSR5_SERVICE, 0x84);
rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 110));
rt2x00_set_field32(&reg, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 110));
rt2x00pci_register_write(rt2x00dev, ARCSR5, reg);
rt2x00pci_register_write(rt2x00dev, ARCSR1, erp->basic_rates);

10
drivers/net/wireless/rt2x00/rt2500pci.c
View file

@ -327,7 +327,7 @@ static void rt2500pci_config_intf(struct rt2x00_dev *rt2x00dev,
/*
* Enable beacon config
*/
bcn_preload = PREAMBLE + get_duration(IEEE80211_HEADER, 20);
bcn_preload = PREAMBLE + GET_DURATION(IEEE80211_HEADER, 20);
rt2x00pci_register_read(rt2x00dev, BCNCSR1, &reg);
rt2x00_set_field32(&reg, BCNCSR1_PRELOAD, bcn_preload);
rt2x00_set_field32(&reg, BCNCSR1_BEACON_CWMIN, queue->cw_min);
@ -373,25 +373,25 @@ static void rt2500pci_config_erp(struct rt2x00_dev *rt2x00dev,
rt2x00pci_register_read(rt2x00dev, ARCSR2, &reg);
rt2x00_set_field32(&reg, ARCSR2_SIGNAL, 0x00);
rt2x00_set_field32(&reg, ARCSR2_SERVICE, 0x04);
rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 10));
rt2x00_set_field32(&reg, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 10));
rt2x00pci_register_write(rt2x00dev, ARCSR2, reg);
rt2x00pci_register_read(rt2x00dev, ARCSR3, &reg);
rt2x00_set_field32(&reg, ARCSR3_SIGNAL, 0x01 | preamble_mask);
rt2x00_set_field32(&reg, ARCSR3_SERVICE, 0x04);
rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 20));
rt2x00_set_field32(&reg, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 20));
rt2x00pci_register_write(rt2x00dev, ARCSR3, reg);
rt2x00pci_register_read(rt2x00dev, ARCSR4, &reg);
rt2x00_set_field32(&reg, ARCSR4_SIGNAL, 0x02 | preamble_mask);
rt2x00_set_field32(&reg, ARCSR4_SERVICE, 0x04);
rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 55));
rt2x00_set_field32(&reg, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 55));
rt2x00pci_register_write(rt2x00dev, ARCSR4, reg);
rt2x00pci_register_read(rt2x00dev, ARCSR5, &reg);
rt2x00_set_field32(&reg, ARCSR5_SIGNAL, 0x03 | preamble_mask);
rt2x00_set_field32(&reg, ARCSR5_SERVICE, 0x84);
rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 110));
rt2x00_set_field32(&reg, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 110));
rt2x00pci_register_write(rt2x00dev, ARCSR5, reg);
rt2x00pci_register_write(rt2x00dev, ARCSR1, erp->basic_rates);

2
drivers/net/wireless/rt2x00/rt2500usb.c
View file

@ -385,7 +385,7 @@ static void rt2500usb_config_intf(struct rt2x00_dev *rt2x00dev,
/*
* Enable beacon config
*/
bcn_preload = PREAMBLE + get_duration(IEEE80211_HEADER, 20);
bcn_preload = PREAMBLE + GET_DURATION(IEEE80211_HEADER, 20);
rt2500usb_register_read(rt2x00dev, TXRX_CSR20, &reg);
rt2x00_set_field16(&reg, TXRX_CSR20_OFFSET, bcn_preload >> 6);
rt2x00_set_field16(&reg, TXRX_CSR20_BCN_EXPECT_WINDOW,

31
drivers/net/wireless/rt2x00/rt2x00.h
View file

@ -91,6 +91,16 @@
#define EEPROM(__dev, __msg, __args...) \
DEBUG_PRINTK(__dev, KERN_DEBUG, "EEPROM recovery", __msg, ##__args)
/*
* Duration calculations
* The rate variable passed is: 100kbs.
* To convert from bytes to bits we multiply size with 8,
* then the size is multiplied with 10 to make the
* real rate -> rate argument correction.
*/
#define GET_DURATION(__size, __rate) (((__size) * 8 * 10) / (__rate))
#define GET_DURATION_RES(__size, __rate)(((__size) * 8 * 10) % (__rate))
/*
* Standard timing and size defines.
* These values should follow the ieee80211 specifications.
@ -109,9 +119,9 @@
#define DIFS ( PIFS + SLOT_TIME )
#define SHORT_DIFS ( SHORT_PIFS + SHORT_SLOT_TIME )
#define EIFS ( SIFS + DIFS + \
(8 * (IEEE80211_HEADER + ACK_SIZE)) )
GET_DURATION(IEEE80211_HEADER + ACK_SIZE, 10) )
#define SHORT_EIFS ( SIFS + SHORT_DIFS + \
(8 * (IEEE80211_HEADER + ACK_SIZE)) )
GET_DURATION(IEEE80211_HEADER + ACK_SIZE, 10) )
/*
* Chipset identification
@ -920,23 +930,6 @@ static inline u16 rt2x00_check_rev(const struct rt2x00_chip *chipset,
!!(chipset->rev & 0x0000f));
}
/*
* Duration calculations
* The rate variable passed is: 100kbs.
* To convert from bytes to bits we multiply size with 8,
* then the size is multiplied with 10 to make the
* real rate -> rate argument correction.
*/
static inline u16 get_duration(const unsigned int size, const u8 rate)
{
return ((size * 8 * 10) / rate);
}
static inline u16 get_duration_res(const unsigned int size, const u8 rate)
{
return ((size * 8 * 10) % rate);
}
/**
* rt2x00queue_map_txskb - Map a skb into DMA for TX purposes.
* @rt2x00dev: Pointer to &struct rt2x00_dev.

4
drivers/net/wireless/rt2x00/rt2x00config.c
View file

@ -92,8 +92,8 @@ void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
erp.ack_timeout = PLCP + erp.difs + get_duration(ACK_SIZE, 10);
erp.ack_consume_time = SIFS + PLCP + get_duration(ACK_SIZE, 10);
erp.ack_timeout = PLCP + erp.difs + GET_DURATION(ACK_SIZE, 10);
erp.ack_consume_time = SIFS + PLCP + GET_DURATION(ACK_SIZE, 10);
if (bss_conf->use_short_preamble) {
erp.ack_timeout += SHORT_PREAMBLE;

4
drivers/net/wireless/rt2x00/rt2x00queue.c
View file

@ -319,8 +319,8 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
/*
* Convert length to microseconds.
*/
residual = get_duration_res(data_length, hwrate->bitrate);
duration = get_duration(data_length, hwrate->bitrate);
residual = GET_DURATION_RES(data_length, hwrate->bitrate);
duration = GET_DURATION(data_length, hwrate->bitrate);
if (residual != 0) {
duration++;