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Date:	Mon, 19 Mar 2012 14:12:41 -0700
From:	Yi Zou <>
Subject: [PATCH] net: update the usage of CHECKSUM_UNNECESSARY

As suggested by Ben, this adds the clarification on the usage of
CHECKSUM_UNNECESSARY on the outgoing patch. Also add the usage
for the kernel FCoE protocol driver.

This is a follow-up to the following:

Signed-off-by: Yi Zou <>
Cc: Ben Hutchings <>
Cc: Jeff Kirsher <>
Cc: <>

 include/linux/skbuff.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 8dc8257..a2b9953 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -94,6 +94,13 @@
  *			  about CHECKSUM_UNNECESSARY. 8)
  *	NETIF_F_IPV6_CSUM about as dumb as the last one but does IPv6 instead.
+ *	UNNECESSARY: device will do per protocol specific csum. Protocol drivers
+ *	that do not want net to perform the checksum calculation should use
+ *	this flag in their outgoing skbs.
+ *	NETIF_F_FCOE_CRC  this indicates the device can do FCoE FC CRC
+ *			  offload. Correspondingly, the FCoE protocol driver
+ *			  stack should use CHECKSUM_UNNECESSARY.
+ *
  *	Any questions? No questions, good. 		--ANK

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