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| author |   Anjali Singhai Jain <anjali.singhai@intel.com> | 2015-10-26 19:44:29 -0400 |
|---|---|---|
| committer |   Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2015-12-01 22:29:04 -0800 |
| commit | 6a7fded776a778f728b13d83a2c9fc893580c080 (patch) | |
| tree | f19a528830d23ae768c1a3f6ff7b4944c91762fe /drivers/net/ethernet/intel/i40evf/i40e_txrx.h | |
| parent | i40e: rename rss_size to alloc_rss_size in i40e_pf (diff) | |
| download | linux-dev-6a7fded776a778f728b13d83a2c9fc893580c080.tar.xz linux-dev-6a7fded776a778f728b13d83a2c9fc893580c080.zip | |
i40e/i40evf: Fix RS bit update in Tx path and disable force WB workaround
This patch fixes the issue of forcing WB too often causing us to not
benefit from NAPI.
Without this patch we were forcing WB/arming interrupt too often taking
away the benefits of NAPI and causing a performance impact.
With this patch we disable force WB in the clean routine for X710
and XL710 adapters. X722 adapters do not enable interrupt to force
a WB and benefit from WB_ON_ITR and hence force WB is left enabled
for those adapters.
For XL710 and X710 adapters if we have less than 4 packets pending
a software Interrupt triggered from service task will force a WB.
This patch also changes the conditions for setting RS bit as described
in code comments. This optimizes when the HW does a tail bump amd when
it does a WB. It also optimizes when we do a wmb.
Change-ID: Id831e1ae7d3e2ec3f52cd0917b41ce1d22d75d9d
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/i40evf/i40e_txrx.h')
| -rw-r--r-- | drivers/net/ethernet/intel/i40evf/i40e_txrx.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h index 997b374e86af..929ddd9f8215 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h @@ -268,6 +268,8 @@ struct i40e_ring { bool ring_active; /* is ring online or not */ bool arm_wb; /* do something to arm write back */ + u8 packet_stride; +#define I40E_TXR_FLAGS_LAST_XMIT_MORE_SET BIT(2) u16 flags; #define I40E_TXR_FLAGS_WB_ON_ITR BIT(0) |