igb: use buffer_info->dma instead of shinfo->nr_frags to determine unmap

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This change makes it so that we use buffer_info->dma instead of
shinfo->nr_frags to determine if we need to unmap a received skb.  By doing
this we can avoid a cache miss on small packets since the buffer_info
structure should already be prefetched.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Alexander Duyck 2009-07-23 18:10:06 +00:00 • committed by David S. Miller

parent 4703bf73bd

commit 2d94d8ab76

1 changed files with 18 additions and 12 deletions

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drivers/net/igb/igb_main.c

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