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authorJesse Brandeburg <jesse.brandeburg@intel.com>2009-07-06 10:44:20 +0000
committerDavid S. Miller <davem@davemloft.net>2009-07-06 18:07:47 -0700
commit94c9e5a89349a1f1ebabe0876c059dc387b8b2a0 (patch)
tree77ca6e744fdcdbe129e2b8ec06132c1f36f5aa27 /drivers/net/e1000/e1000.h
parentf77139c07a0e1dd164e039320ada50111f899223 (diff)
e1000: allow ethtool coalesece to adjust interrupts per second
This patch allows on-the-fly adjustment of the interrupts per second generated by e1000 devices 82545/82546 (hardware support of ITR register is a requirement) adjust using this command: ethtool -C eth0 rx-usecs 10 where 10 is 10 microseconds per interrupt interval, so 10 = 100,000 interrupts per second, and 125 = 8000 interrupts per second. changes should be immediate. 1,3 are special values and indicate the automatic tuning mode to the driver, where 1 is 4000-90000 interrupts per second and 3 is 4000-20000 interrupts per second and is the driver default. Signed-off-by: Jesse Brandeburg <jesse.brandeburg@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/e1000/e1000.h')
-rw-r--r--drivers/net/e1000/e1000.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index e9a416f40162..c87f2cbdbae3 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -111,6 +111,9 @@ do { \
#define E1000_MIN_RXD 80
#define E1000_MAX_82544_RXD 4096
+#define E1000_MIN_ITR_USECS 10 /* 100000 irq/sec */
+#define E1000_MAX_ITR_USECS 10000 /* 100 irq/sec */
+
/* this is the size past which hardware will drop packets when setting LPE=0 */
#define MAXIMUM_ETHERNET_VLAN_SIZE 1522