diff options
| author | Venkatesh Srinivas <venkateshs@google.com> | 2018-05-25 00:13:21 -0400 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2018-07-26 09:04:05 -0700 |
| commit | 73017f4e051c86985cf4647eceee34de7c13b1b1 (patch) | |
| tree | 605507857b6a8f241e0d41bd8c303d61f74f36b2 /drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | |
| parent | 2a83fba6cae89dd9c0625e68ff8ffff791c67ac0 (diff) | |
igb: Use dma_wmb() instead of wmb() before doorbell writes
igb writes to doorbells to post transmit and receive descriptors;
after writing descriptors to memory but before writing to doorbells,
use dma_wmb() rather than wmb(). wmb() is more heavyweight than
necessary before doorbell writes.
On x86, this avoids SFENCEs before doorbell writes in both the
tx and rx refill paths.
Signed-off-by: Venkatesh Srinivas <venkateshs@google.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_main.c')
0 files changed, 0 insertions, 0 deletions