Venkatesh Srinivas 583cf7be75 e1000: Use dma_wmb() instead of wmb() before doorbell writes ... e1000 writes to doorbells to post transmit descriptors and fill the receive ring. After writing descriptors to memory but before writing to doorbells, use dma_wmb() rather than wmb(). wmb() is more heavyweight than necessary for a device to see descriptor writes. On x86, this avoids SFENCEs before doorbell writes in both the Tx and Rx paths. On ARM, this converts DSB ST -> DMB OSHST. Tested: 82576EB / x86; QEMU (qemu emulates an 8257x) 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>		2019-06-28 15:59:43 -07:00
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Makefile	net: intel: Cleanup the copyright/license headers	2018-04-27 14:00:04 -04:00
e1000.h	net: intel: Cleanup the copyright/license headers	2018-04-27 14:00:04 -04:00
e1000_ethtool.c	cross-tree: phase out dma_zalloc_coherent()	2019-01-08 07:58:37 -05:00
e1000_hw.c	net: intel: Cleanup the copyright/license headers	2018-04-27 14:00:04 -04:00
e1000_hw.h	net: intel: Cleanup the copyright/license headers	2018-04-27 14:00:04 -04:00
e1000_main.c	e1000: Use dma_wmb() instead of wmb() before doorbell writes	2019-06-28 15:59:43 -07:00
e1000_osdep.h	net: intel: Cleanup the copyright/license headers	2018-04-27 14:00:04 -04:00
e1000_param.c	net: intel: Cleanup the copyright/license headers	2018-04-27 14:00:04 -04:00