linux

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Alexander Duyck 124b74c18e fm10k/igb/ixgbe: Use dma_rmb on Rx descriptor reads

This change makes it so that dma_rmb is used when reading the Rx
descriptor.  The advantage of dma_rmb is that it allows for a much
lower cost barrier on x86, powerpc, arm, and arm64 architectures than a
traditional memory barrier when dealing with reads that only have to
synchronize to coherent memory.

In addition I have updated the code so that it just checks to see if any
bits have been set instead of just the DD bit since the DD bit will always
be set as a part of a descriptor write-back so we just need to check for a
non-zero value being present at that memory location rather than just
checking for any specific bit.  This allows the code itself to appear much
cleaner and allows the compiler more room to optimize.

Cc: Matthew Vick <matthew.vick@intel.com>
Cc: Don Skidmore <donald.c.skidmore@intel.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2014-12-11 21:15:06 -05:00

e1000

ethernet/intel: Use napi_alloc_skb

2014-12-10 13:31:57 -05:00

e1000e

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2014-12-11 14:27:06 -08:00

fm10k

fm10k/igb/ixgbe: Use dma_rmb on Rx descriptor reads

2014-12-11 21:15:06 -05:00

i40e

i40e/i40evf: Convert macro to static inline