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authorBruce Allan <bruce.w.allan@intel.com>2009-06-02 11:28:39 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-03 02:46:33 -0700
commit3ec2a2b80f3eb53851fe4cef9e65b5d33376ef89 (patch)
treeaa95f81379ccc614232fdf127e9706b5d61cc7a8 /drivers/net/e1000e/netdev.c
parent918d7197aa18a562eb7dc37b80a87e9ff1d7f7d9 (diff)
e1000e: correct flow control thresholds
The flow control thresholds, i.e. high and low watermarks of the Rx FIFO for when the hardware should transmit PAUSE frames (XON and XOFF, respectively), need to be tuned for more efficient use of the FIFO. The logic to set the thresholds for parts that support early-receive (ERT) was also wrong in that it should check whether jumbo frames are in use. Signed-off-by: Bruce Allan <bruce.w.allan@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/e1000e/netdev.c')
-rw-r--r--drivers/net/e1000e/netdev.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 7e412d1168e..b7a46c51378 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -2751,23 +2751,25 @@ void e1000e_reset(struct e1000_adapter *adapter)
/*
* flow control settings
*
- * The high water mark must be low enough to fit one full frame
+ * The high water mark must be low enough to fit two full frame
* (or the size used for early receive) above it in the Rx FIFO.
* Set it to the lower of:
* - 90% of the Rx FIFO size, and
* - the full Rx FIFO size minus the early receive size (for parts
* with ERT support assuming ERT set to E1000_ERT_2048), or
- * - the full Rx FIFO size minus one full frame
+ * - the full Rx FIFO size minus two full frames
*/
- if (adapter->flags & FLAG_HAS_ERT)
+ if ((adapter->flags & FLAG_HAS_ERT) &&
+ (adapter->netdev->mtu > ETH_DATA_LEN))
hwm = min(((pba << 10) * 9 / 10),
((pba << 10) - (E1000_ERT_2048 << 3)));
else
hwm = min(((pba << 10) * 9 / 10),
- ((pba << 10) - adapter->max_frame_size));
+ ((pba << 10) - (2 * adapter->max_frame_size)));
- fc->high_water = hwm & 0xFFF8; /* 8-byte granularity */
- fc->low_water = fc->high_water - 8;
+ fc->high_water = hwm & E1000_FCRTH_RTH; /* 8-byte granularity */
+ fc->low_water = (fc->high_water - (2 * adapter->max_frame_size));
+ fc->low_water &= E1000_FCRTL_RTL; /* 8-byte granularity */
if (adapter->flags & FLAG_DISABLE_FC_PAUSE_TIME)
fc->pause_time = 0xFFFF;