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authorStephen Hemminger <shemminger@osdl.org>2006-10-20 17:06:11 -0700
committerJeff Garzik <jeff@garzik.org>2006-10-21 14:08:24 -0400
commit470ea7eba4aaa517533f9b02ac9a104e77264548 (patch)
tree2726cf596e46f72e7ab54860a0589b2f858c5f21 /drivers/net
parent7347b03d25ad7d7f001373cf64f709457c6af618 (diff)
[PATCH] sky2: 88E803X transmit lockup
The reason sky2 driver was locking up on transmit on the Yukon-FE chipset is that it was misconfiguring the internal RAM buffer so the transmitter and receiver were sharing the same space. The code assumed there was 16K of RAM on Yukon-FE (taken from vendor driver sk98lin which is even more f*cked up on this). Then it assigned based on that. The giveaway was that the registers would only hold 9bits so both RX/TX had 0..1ff for space. It is a wonder it worked at all! This patch addresses this, and fixes an easily reproducible hang on Transmit. Only the Yukon-FE chip is Marvell 88E803X (10/100 only) are affected. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/sky2.c33
1 files changed, 12 insertions, 21 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 67ecd66f26d..95efdb5bbbe 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -699,16 +699,10 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port)
}
-/* Assign Ram Buffer allocation.
- * start and end are in units of 4k bytes
- * ram registers are in units of 64bit words
- */
-static void sky2_ramset(struct sky2_hw *hw, u16 q, u8 startk, u8 endk)
+/* Assign Ram Buffer allocation in units of 64bit (8 bytes) */
+static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, u32 end)
{
- u32 start, end;
-
- start = startk * 4096/8;
- end = (endk * 4096/8) - 1;
+ pr_debug(PFX "q %d %#x %#x\n", q, start, end);
sky2_write8(hw, RB_ADDR(q, RB_CTRL), RB_RST_CLR);
sky2_write32(hw, RB_ADDR(q, RB_START), start);
@@ -717,7 +711,7 @@ static void sky2_ramset(struct sky2_hw *hw, u16 q, u8 startk, u8 endk)
sky2_write32(hw, RB_ADDR(q, RB_RP), start);
if (q == Q_R1 || q == Q_R2) {
- u32 space = (endk - startk) * 4096/8;
+ u32 space = end - start + 1;
u32 tp = space - space/4;
/* On receive queue's set the thresholds
@@ -1199,19 +1193,16 @@ static int sky2_up(struct net_device *dev)
sky2_mac_init(hw, port);
- /* Determine available ram buffer space (in 4K blocks).
- * Note: not sure about the FE setting below yet
- */
- if (hw->chip_id == CHIP_ID_YUKON_FE)
- ramsize = 4;
- else
- ramsize = sky2_read8(hw, B2_E_0);
+ /* Determine available ram buffer space in qwords. */
+ ramsize = sky2_read8(hw, B2_E_0) * 4096/8;
- /* Give transmitter one third (rounded up) */
- rxspace = ramsize - (ramsize + 2) / 3;
+ if (ramsize > 6*1024/8)
+ rxspace = ramsize - (ramsize + 2) / 3;
+ else
+ rxspace = ramsize / 2;
- sky2_ramset(hw, rxqaddr[port], 0, rxspace);
- sky2_ramset(hw, txqaddr[port], rxspace, ramsize);
+ sky2_ramset(hw, rxqaddr[port], 0, rxspace-1);
+ sky2_ramset(hw, txqaddr[port], rxspace, ramsize-1);
/* Make sure SyncQ is disabled */
sky2_write8(hw, RB_ADDR(port == 0 ? Q_XS1 : Q_XS2, RB_CTRL),