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sk_buff.h: improve description of CHECKSUM_{COMPLETE, UNNECESSARY}

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Add FCoE to the list of protocols that can set CHECKSUM_UNNECESSARY; add a
note to CHECKSUM_COMPLETE section to specify that it does not apply to SCTP
and FCoE protocols.

Suggested-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Davide Caratti 2017-05-18 15:44:43 +02:00 committed by David S. Miller
parent 7529390d08
commit b4759dcdcd
1 changed files with 5 additions and 2 deletions
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7
include/linux/skbuff.h
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@ -109,6 +109,7 @@
* may perform further validation in this case.
* GRE: only if the checksum is present in the header.
* SCTP: indicates the CRC in SCTP header has been validated.
* FCOE: indicates the CRC in FC frame has been validated.
*
* skb->csum_level indicates the number of consecutive checksums found in
* the packet minus one that have been verified as CHECKSUM_UNNECESSARY.
@ -126,8 +127,10 @@
* packet as seen by netif_rx() and fills out in skb->csum. Meaning, the
* hardware doesn't need to parse L3/L4 headers to implement this.
*
* Note: Even if device supports only some protocols, but is able to produce
* skb->csum, it MUST use CHECKSUM_COMPLETE, not CHECKSUM_UNNECESSARY.
* Notes:
* - Even if device supports only some protocols, but is able to produce
* skb->csum, it MUST use CHECKSUM_COMPLETE, not CHECKSUM_UNNECESSARY.
* - CHECKSUM_COMPLETE is not applicable to SCTP and FCoE protocols.
*
* CHECKSUM_PARTIAL:
*