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mbuf: Remove UDP_IPV4_EX, which was never defined.

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Add comment to explain the IPV6_EX suffix.  The confusion about
these RSS hash type probably stems from the facts that they were
never widely implemented by hardwares.

Reviewed by:	rwatson
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D12453
This commit is contained in:
Sepherosa Ziehau 2017-09-27 06:31:35 +00:00
parent 03b04fd4f3
commit f870aef090
1 changed files with 10 additions and 3 deletions
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13
sys/sys/mbuf.h
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@ -335,6 +335,16 @@ struct mbuf {
* for ordering and distribution without explicit affinity. Additionally,
* M_HASHTYPE_OPAQUE_HASH indicates that the flow identifier has hash
* properties.
*
* The meaning of the IPV6_EX suffix:
* "o Home address from the home address option in the IPv6 destination
* options header. If the extension header is not present, use the Source
* IPv6 Address.
* o IPv6 address that is contained in the Routing-Header-Type-2 from the
* associated extension header. If the extension header is not present,
* use the Destination IPv6 Address."
* Quoted from:
* https://docs.microsoft.com/en-us/windows-hardware/drivers/network/rss-hashing-types#ndishashipv6ex
*/
#define M_HASHTYPE_HASHPROP 0x80 /* has hash properties */
#define M_HASHTYPE_HASH(t) (M_HASHTYPE_HASHPROP | (t))
@ -348,10 +358,7 @@ struct mbuf {
* ext hdrs */
#define M_HASHTYPE_RSS_TCP_IPV6_EX M_HASHTYPE_HASH(6) /* TCPv6 4-tuple +
* ext hdrs */
/* Non-standard RSS hash types */
#define M_HASHTYPE_RSS_UDP_IPV4 M_HASHTYPE_HASH(7) /* IPv4 UDP 4-tuple*/
#define M_HASHTYPE_RSS_UDP_IPV4_EX M_HASHTYPE_HASH(8) /* IPv4 UDP 4-tuple +
* ext hdrs */
#define M_HASHTYPE_RSS_UDP_IPV6 M_HASHTYPE_HASH(9) /* IPv6 UDP 4-tuple*/
#define M_HASHTYPE_RSS_UDP_IPV6_EX M_HASHTYPE_HASH(10)/* IPv6 UDP 4-tuple +
* ext hdrs */