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| author | Stephen Hemminger <shemminger@osdl.org> | 2006-05-22 12:03:42 -0700 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-05-24 00:36:09 -0400 |
| commit | a1433ac4ab46fb23ae77804c207a1f710a7b12f1 (patch) | |
| tree | 8823b8402768b6ad17c4cbeb4b0512245e5b1825 /drivers | |
| parent | 387e2b0439026aa738a9edca15a57e5c0bcb4dfc (diff) | |
| download | linux-a1433ac4ab46fb23ae77804c207a1f710a7b12f1.tar.gz linux-a1433ac4ab46fb23ae77804c207a1f710a7b12f1.tar.bz2 linux-a1433ac4ab46fb23ae77804c207a1f710a7b12f1.zip | |
[PATCH] sky2: fix jumbo packet support
The truncate threshold calculation to prevent receiver from getting stuck
was incorrect, and it didn't take into account the upper limit on bits
in the register so the jumbo packet support was broken.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/sky2.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index 60779ebf2ff6..959109609d85 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -979,6 +979,7 @@ static int sky2_rx_start(struct sky2_port *sky2) struct sky2_hw *hw = sky2->hw; unsigned rxq = rxqaddr[sky2->port]; int i; + unsigned thresh; sky2->rx_put = sky2->rx_next = 0; sky2_qset(hw, rxq); @@ -1003,9 +1004,21 @@ static int sky2_rx_start(struct sky2_port *sky2) sky2_rx_add(sky2, re->mapaddr); } - /* Truncate oversize frames */ - sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), sky2->rx_bufsize - 8); - sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_ON); + + /* + * The receiver hangs if it receives frames larger than the + * packet buffer. As a workaround, truncate oversize frames, but + * the register is limited to 9 bits, so if you do frames > 2052 + * you better get the MTU right! + */ + thresh = (sky2->rx_bufsize - 8) / sizeof(u32); + if (thresh > 0x1ff) + sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_OFF); + else { + sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), thresh); + sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_ON); + } + /* Tell chip about available buffers */ sky2_write16(hw, Y2_QADDR(rxq, PREF_UNIT_PUT_IDX), sky2->rx_put); |