b43: Fix throughput regression

Commit c7ab5ef9bcd281135c21b4732c9be779585181be entitled "b43: implement
short slot and basic rate handling" reduced the transmit throughput for
my BCM4311 device from 18 Mb/s to 0.7 Mb/s. The basic rate handling
portion is OK, the problem is in the short slot handling.

Prior to this change, the short slot enable/disable routines were never
called. Experimentation showed that the critical part was changing the
value at offset 0x0010 in the shared memory. This is supposed to contain
the 802.11 Slot Time in usec, but if it is changed from its initial value
of zero, performance is destroyed. On the other hand, changing the value
in the MMIO register corresponding to the Interframe Slot Time increased
performance from 18 to 22 Mb/s. A BCM4306/3 also shows dramatic
improvement of the transmit rate from 5.3 to 19.0 Mb/s.

Other changes in the patch include removal of the magic number for the
MMIO register, and allowing the slot time to be set for any PHY operating
in the 2.4 GHz band. Previously, the routine was executed only for G PHYs.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@kernel.org> [Any stable version back through 2.6.28]
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/b43/b43.h b/drivers/net/wireless/b43/b43.h
index fe3bf949199780bea902d3ad3cad122311c5612f..c484cc25389255f7609a55cdff7b414adeb805fe 100644 (file)
--- a/drivers/net/wireless/b43/b43.h
+++ b/drivers/net/wireless/b43/b43.h
@@ -115,6 +115,7 @@
 #define B43_MMIO_TSF_2                 0x636   /* core rev < 3 only */
 #define B43_MMIO_TSF_3                 0x638   /* core rev < 3 only */
 #define B43_MMIO_RNG                   0x65A
+#define B43_MMIO_IFSSLOT               0x684   /* Interframe slot time */
 #define B43_MMIO_IFSCTL                        0x688 /* Interframe space control */
 #define  B43_MMIO_IFSCTL_USE_EDCF      0x0004
 #define B43_MMIO_POWERUP_DELAY         0x6A8

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 19b4eae47b594c95a389853a0dfb7ef67943b85b..fcbf0e27d9f377a0aa0177ad2b9700bc8563798e 100644 (file)
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -628,10 +628,17 @@ static void b43_upload_card_macaddress(struct b43_wldev *dev)
 static void b43_set_slot_time(struct b43_wldev *dev, u16 slot_time)
 {
        /* slot_time is in usec. */
-       if (dev->phy.type != B43_PHYTYPE_G)
+       /* This test used to exit for all but a G PHY. */
+       if (b43_current_band(dev->wl) == IEEE80211_BAND_5GHZ)
                return;
-       b43_write16(dev, 0x684, 510 + slot_time);
-       b43_shm_write16(dev, B43_SHM_SHARED, 0x0010, slot_time);
+       b43_write16(dev, B43_MMIO_IFSSLOT, 510 + slot_time);
+       /* Shared memory location 0x0010 is the slot time and should be
+        * set to slot_time; however, this register is initially 0 and changing
+        * the value adversely affects the transmit rate for BCM4311
+        * devices. Until this behavior is unterstood, delete this step
+        *
+        * b43_shm_write16(dev, B43_SHM_SHARED, 0x0010, slot_time);
+        */
 }
 
 static void b43_short_slot_timing_enable(struct b43_wldev *dev)