leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

b43: Optimize PIO scratchbuffer usage

Browse Source 
This optimizes the PIO scratchbuffer usage.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch 2009-10-09 20:33:32 +02:00 committed by John W. Linville
parent 2c759e03b3
commit 88499ab3d8
3 changed files with 51 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/net/wireless/b43/b43.h
View File

@ -749,12 +749,6 @@ struct b43_wldev {
#endif
};
/*
* Include goes here to avoid a dependency problem.
* A better fix would be to integrate xmit.h into b43.h.
*/
#include "xmit.h"
/* Data structure for the WLAN parts (802.11 cores) of the b43 chip. */
struct b43_wl {
/* Pointer to the active wireless device on this chip */
@ -830,13 +824,9 @@ struct b43_wl {
struct b43_leds leds;
#ifdef CONFIG_B43_PIO
/*
* RX/TX header/tail buffers used by the frame transmit functions.
*/
struct b43_rxhdr_fw4 rxhdr;
struct b43_txhdr txhdr;
u8 rx_tail[4];
u8 tx_tail[4];
/* Kmalloc'ed scratch space for PIO TX/RX. Protected by wl->mutex. */
u8 pio_scratchspace[110] __attribute__((__aligned__(8)));
u8 pio_tailspace[4] __attribute__((__aligned__(8)));
#endif /* CONFIG_B43_PIO */
};

79
drivers/net/wireless/b43/pio.c
View File

@ -341,12 +341,15 @@ static u16 tx_write_2byte_queue(struct b43_pio_txqueue *q,
q->mmio_base + B43_PIO_TXDATA,
sizeof(u16));
if (data_len & 1) {
u8 *tail = wl->pio_tailspace;
BUILD_BUG_ON(sizeof(wl->pio_tailspace) < 2);
/* Write the last byte. */
ctl &= ~B43_PIO_TXCTL_WRITEHI;
b43_piotx_write16(q, B43_PIO_TXCTL, ctl);
wl->tx_tail[0] = data[data_len - 1];
wl->tx_tail[1] = 0;
ssb_block_write(dev->dev, wl->tx_tail, 2,
tail[0] = data[data_len - 1];
tail[1] = 0;
ssb_block_write(dev->dev, tail, 2,
q->mmio_base + B43_PIO_TXDATA,
sizeof(u16));
}
@ -392,31 +395,31 @@ static u32 tx_write_4byte_queue(struct b43_pio_txqueue *q,
q->mmio_base + B43_PIO8_TXDATA,
sizeof(u32));
if (data_len & 3) {
wl->tx_tail[3] = 0;
u8 *tail = wl->pio_tailspace;
BUILD_BUG_ON(sizeof(wl->pio_tailspace) < 4);
memset(tail, 0, 4);
/* Write the last few bytes. */
ctl &= ~(B43_PIO8_TXCTL_8_15 | B43_PIO8_TXCTL_16_23 |
B43_PIO8_TXCTL_24_31);
switch (data_len & 3) {
case 3:
ctl |= B43_PIO8_TXCTL_16_23 | B43_PIO8_TXCTL_8_15;
wl->tx_tail[0] = data[data_len - 3];
wl->tx_tail[1] = data[data_len - 2];
wl->tx_tail[2] = data[data_len - 1];
tail[0] = data[data_len - 3];
tail[1] = data[data_len - 2];
tail[2] = data[data_len - 1];
break;
case 2:
ctl |= B43_PIO8_TXCTL_8_15;
wl->tx_tail[0] = data[data_len - 2];
wl->tx_tail[1] = data[data_len - 1];
wl->tx_tail[2] = 0;
tail[0] = data[data_len - 2];
tail[1] = data[data_len - 1];
break;
case 1:
wl->tx_tail[0] = data[data_len - 1];
wl->tx_tail[1] = 0;
wl->tx_tail[2] = 0;
tail[0] = data[data_len - 1];
break;
}
b43_piotx_write32(q, B43_PIO8_TXCTL, ctl);
ssb_block_write(dev->dev, wl->tx_tail, 4,
ssb_block_write(dev->dev, tail, 4,
q->mmio_base + B43_PIO8_TXDATA,
sizeof(u32));
}
@ -455,6 +458,7 @@ static int pio_tx_frame(struct b43_pio_txqueue *q,
int err;
unsigned int hdrlen;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct b43_txhdr *txhdr = (struct b43_txhdr *)wl->pio_scratchspace;
B43_WARN_ON(list_empty(&q->packets_list));
pack = list_entry(q->packets_list.next,
@ -462,7 +466,9 @@ static int pio_tx_frame(struct b43_pio_txqueue *q,
cookie = generate_cookie(q, pack);
hdrlen = b43_txhdr_size(dev);
err = b43_generate_txhdr(dev, (u8 *)&wl->txhdr, skb,
BUILD_BUG_ON(sizeof(wl->pio_scratchspace) < sizeof(struct b43_txhdr));
B43_WARN_ON(sizeof(wl->pio_scratchspace) < hdrlen);
err = b43_generate_txhdr(dev, (u8 *)txhdr, skb,
info, cookie);
if (err)
return err;
@ -476,9 +482,9 @@ static int pio_tx_frame(struct b43_pio_txqueue *q,
pack->skb = skb;
if (q->rev >= 8)
pio_tx_frame_4byte_queue(pack, (const u8 *)&wl->txhdr, hdrlen);
pio_tx_frame_4byte_queue(pack, (const u8 *)txhdr, hdrlen);
else
pio_tx_frame_2byte_queue(pack, (const u8 *)&wl->txhdr, hdrlen);
pio_tx_frame_2byte_queue(pack, (const u8 *)txhdr, hdrlen);
/* Remove it from the list of available packet slots.
* It will be put back when we receive the status report. */
@ -624,8 +630,11 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)
unsigned int i, padding;
struct sk_buff *skb;
const char *err_msg = NULL;
struct b43_rxhdr_fw4 *rxhdr =
(struct b43_rxhdr_fw4 *)wl->pio_scratchspace;
memset(&wl->rxhdr, 0, sizeof(wl->rxhdr));
BUILD_BUG_ON(sizeof(wl->pio_scratchspace) < sizeof(*rxhdr));
memset(rxhdr, 0, sizeof(*rxhdr));
/* Check if we have data and wait for it to get ready. */
if (q->rev >= 8) {
@ -663,16 +672,16 @@ data_ready:
/* Get the preamble (RX header) */
if (q->rev >= 8) {
ssb_block_read(dev->dev, &wl->rxhdr, sizeof(wl->rxhdr),
ssb_block_read(dev->dev, rxhdr, sizeof(*rxhdr),
q->mmio_base + B43_PIO8_RXDATA,
sizeof(u32));
} else {
ssb_block_read(dev->dev, &wl->rxhdr, sizeof(wl->rxhdr),
ssb_block_read(dev->dev, rxhdr, sizeof(*rxhdr),
q->mmio_base + B43_PIO_RXDATA,
sizeof(u16));
}
/* Sanity checks. */
len = le16_to_cpu(wl->rxhdr.frame_len);
len = le16_to_cpu(rxhdr->frame_len);
if (unlikely(len > 0x700)) {
err_msg = "len > 0x700";
goto rx_error;
@ -682,7 +691,7 @@ data_ready:
goto rx_error;
}
macstat = le32_to_cpu(wl->rxhdr.mac_status);
macstat = le32_to_cpu(rxhdr->mac_status);
if (macstat & B43_RX_MAC_FCSERR) {
if (!(q->dev->wl->filter_flags & FIF_FCSFAIL)) {
/* Drop frames with failed FCS. */
@ -707,22 +716,25 @@ data_ready:
q->mmio_base + B43_PIO8_RXDATA,
sizeof(u32));
if (len & 3) {
u8 *tail = wl->pio_tailspace;
BUILD_BUG_ON(sizeof(wl->pio_tailspace) < 4);
/* Read the last few bytes. */
ssb_block_read(dev->dev, wl->rx_tail, 4,
ssb_block_read(dev->dev, tail, 4,
q->mmio_base + B43_PIO8_RXDATA,
sizeof(u32));
switch (len & 3) {
case 3:
skb->data[len + padding - 3] = wl->rx_tail[0];
skb->data[len + padding - 2] = wl->rx_tail[1];
skb->data[len + padding - 1] = wl->rx_tail[2];
skb->data[len + padding - 3] = tail[0];
skb->data[len + padding - 2] = tail[1];
skb->data[len + padding - 1] = tail[2];
break;
case 2:
skb->data[len + padding - 2] = wl->rx_tail[0];
skb->data[len + padding - 1] = wl->rx_tail[1];
skb->data[len + padding - 2] = tail[0];
skb->data[len + padding - 1] = tail[1];
break;
case 1:
skb->data[len + padding - 1] = wl->rx_tail[0];
skb->data[len + padding - 1] = tail[0];
break;
}
}
@ -731,15 +743,18 @@ data_ready:
q->mmio_base + B43_PIO_RXDATA,
sizeof(u16));
if (len & 1) {
u8 *tail = wl->pio_tailspace;
BUILD_BUG_ON(sizeof(wl->pio_tailspace) < 2);
/* Read the last byte. */
ssb_block_read(dev->dev, wl->rx_tail, 2,
ssb_block_read(dev->dev, tail, 2,
q->mmio_base + B43_PIO_RXDATA,
sizeof(u16));
skb->data[len + padding - 1] = wl->rx_tail[0];
skb->data[len + padding - 1] = tail[0];
}
}
b43_rx(q->dev, skb, &wl->rxhdr);
b43_rx(q->dev, skb, rxhdr);
return 1;

2
drivers/net/wireless/b43/xmit.c
View File

@ -27,7 +27,7 @@
*/
#include "b43.h"
#include "xmit.h"
#include "phy_common.h"
#include "dma.h"
#include "pio.h"