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ixgbe: Fix RSC completion delay causing Rx interrupts to stop 

When a user disables interrupt throttling with ethtool on 82599 devices,
the interrupt timer may not be re-enabled if hardware RSC is running.  The
RSC completions in hardware don't complete before the next ITR event tries
to fire, so the ITR timer never gets re-armed.  This patch increases the
amount of time between interrupts when throttling is disabled (rx-usecs =
0) when the hardware RSC deature is enabled.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter P Waskiewicz Jr 2009-07-30 12:26:00 +00:00 committed by David S. Miller
parent 0c19d6af92
commit 0a924578bc
2 changed files with 6 additions and 1 deletions
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2
drivers/net/ixgbe/ixgbe.h
View File

@ -96,6 +96,8 @@
#define IXGBE_TX_FLAGS_VLAN_PRIO_MASK 0x0000e000
#define IXGBE_TX_FLAGS_VLAN_SHIFT 16
#define IXGBE_MAX_RSC_INT_RATE 162760
/* wrapper around a pointer to a socket buffer,
* so a DMA handle can be stored along with the buffer */
struct ixgbe_tx_buffer {

5
drivers/net/ixgbe/ixgbe_ethtool.c
View File

@ -1975,7 +1975,10 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
* any other value means disable eitr, which is best
* served by setting the interrupt rate very high
*/
adapter->eitr_param = IXGBE_MAX_INT_RATE;
if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
adapter->eitr_param = IXGBE_MAX_RSC_INT_RATE;
else
adapter->eitr_param = IXGBE_MAX_INT_RATE;
adapter->itr_setting = 0;
}