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net: Support RX-ALL feature flag.

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This flag requests that network devices pass all
received frames up the stack, even ones with errors
such as invalid FCS (frame check sum).  This will
allow sniffers to see bad packets and perhaps
give the user some idea how to fix the problem.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Ben Greear
2012-02-11 15:39:45 +00:00
committed by Jeff Kirsher
parent 943146de22
commit 5e0c03c8cd
3 changed files with 10 additions and 0 deletions
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Documentation/networking/netdev-features.txt
+7
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@@ -158,3 +158,10 @@ VLANs. This may be not useful, though.]
This requests that the NIC append the Ethernet Frame Checksum (FCS)
to the end of the skb data. This allows sniffers and other tools to
read the CRC recorded by the NIC on receipt of the packet.
* rx-all
This requests that the NIC receive all possible frames, including errored
frames (such as bad FCS, etc). This can be helpful when sniffing a link with
bad packets on it. Some NICs may receive more packets if also put into normal
PROMISC mdoe.