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[PATCH] sky2: beter ram buffer partitioning

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Different chips have different sizes of ram buffers, and some versions have
no ram buffer at all!.  Be more careful about sizing the ram usage because
it maybe a problem if vendor keeps changing sizes.

There is the (unlikely) possibility that some of the errors on some of the
chips have been caused by partitioning not on a 1K boundary.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2006-12-04 15:53:45 -08:00 committed by Jeff Garzik
parent e5b74c7ddd
commit 6771290102
1 changed files with 25 additions and 16 deletions
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41
drivers/net/sky2.c
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@ -696,10 +696,15 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port)
}
/* Assign Ram Buffer allocation in units of 64bit (8 bytes) */
static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, u32 end)
/* Assign Ram Buffer allocation to queue */
static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, u32 space)
{
pr_debug(PFX "q %d %#x %#x\n", q, start, end);
u32 end;
/* convert from K bytes to qwords used for hw register */
start *= 1024/8;
space *= 1024/8;
end = start + space - 1;
sky2_write8(hw, RB_ADDR(q, RB_CTRL), RB_RST_CLR);
sky2_write32(hw, RB_ADDR(q, RB_START), start);
@ -708,7 +713,6 @@ static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, u32 end)
sky2_write32(hw, RB_ADDR(q, RB_RP), start);
if (q == Q_R1 || q == Q_R2) {
u32 space = end - start + 1;
u32 tp = space - space/4;
/* On receive queue's set the thresholds
@ -1138,7 +1142,7 @@ static int sky2_up(struct net_device *dev)
struct sky2_port *sky2 = netdev_priv(dev);
struct sky2_hw *hw = sky2->hw;
unsigned port = sky2->port;
u32 ramsize, rxspace, imask;
u32 ramsize, imask;
int cap, err = -ENOMEM;
struct net_device *otherdev = hw->dev[sky2->port^1];
@ -1191,20 +1195,25 @@ static int sky2_up(struct net_device *dev)
sky2_mac_init(hw, port);
/* Determine available ram buffer space in qwords. */
ramsize = sky2_read8(hw, B2_E_0) * 4096/8;
/* Register is number of 4K blocks on internal RAM buffer. */
ramsize = sky2_read8(hw, B2_E_0) * 4;
printk(KERN_INFO PFX "%s: ram buffer %dK\n", dev->name, ramsize);
if (ramsize > 6*1024/8)
rxspace = ramsize - (ramsize + 2) / 3;
else
rxspace = ramsize / 2;
if (ramsize > 0) {
u32 rxspace;
sky2_ramset(hw, rxqaddr[port], 0, rxspace-1);
sky2_ramset(hw, txqaddr[port], rxspace, ramsize-1);
if (ramsize < 16)
rxspace = ramsize / 2;
else
rxspace = 8 + (2*(ramsize - 16))/3;
/* Make sure SyncQ is disabled */
sky2_write8(hw, RB_ADDR(port == 0 ? Q_XS1 : Q_XS2, RB_CTRL),
RB_RST_SET);
sky2_ramset(hw, rxqaddr[port], 0, rxspace);
sky2_ramset(hw, txqaddr[port], rxspace, ramsize - rxspace);
/* Make sure SyncQ is disabled */
sky2_write8(hw, RB_ADDR(port == 0 ? Q_XS1 : Q_XS2, RB_CTRL),
RB_RST_SET);
}
sky2_qset(hw, txqaddr[port]);