diff options
| -rw-r--r-- | sys/sys/mbuf.h | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h index 654f145..249b29e 100644 --- a/sys/sys/mbuf.h +++ b/sys/sys/mbuf.h @@ -199,7 +199,9 @@ struct mbuf { #define M_PROTO6 0x00080000 /* protocol-specific */ #define M_PROTO7 0x00100000 /* protocol-specific */ #define M_PROTO8 0x00200000 /* protocol-specific */ -#define M_FLOWID 0x00400000 /* flowid is valid */ +#define M_FLOWID 0x00400000 /* deprecated: flowid is valid */ +#define M_HASHTYPEBITS 0x0F000000 /* mask of bits holding flowid hash type */ + /* * For RELENG_{6,7} steal these flags for limited multiple routing table * support. In RELENG_8 and beyond, use just one flag and a tag. @@ -215,11 +217,45 @@ struct mbuf { (M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8) /* + * Network interface cards are able to hash protocol fields (such as IPv4 + * addresses and TCP port numbers) classify packets into flows. These flows + * can then be used to maintain ordering while delivering packets to the OS + * via parallel input queues, as well as to provide a stateless affinity + * model. NIC drivers can pass up the hash via m->m_pkthdr.flowid, and set + * m_flag fields to indicate how the hash should be interpreted by the + * network stack. + * + * Most NICs support RSS, which provides ordering and explicit affinity, and + * use the hash m_flag bits to indicate what header fields were covered by + * the hash. M_HASHTYPE_OPAQUE can be set by non-RSS cards or configurations + * that provide an opaque flow identifier, allowing for ordering and + * distribution without explicit affinity. + */ +#define M_HASHTYPE_SHIFT 24 +#define M_HASHTYPE_NONE 0x0 +#define M_HASHTYPE_RSS_IPV4 0x1 /* IPv4 2-tuple */ +#define M_HASHTYPE_RSS_TCP_IPV4 0x2 /* TCPv4 4-tuple */ +#define M_HASHTYPE_RSS_IPV6 0x3 /* IPv6 2-tuple */ +#define M_HASHTYPE_RSS_TCP_IPV6 0x4 /* TCPv6 4-tuple */ +#define M_HASHTYPE_RSS_IPV6_EX 0x5 /* IPv6 2-tuple + ext hdrs */ +#define M_HASHTYPE_RSS_TCP_IPV6_EX 0x6 /* TCPv6 4-tiple + ext hdrs */ +#define M_HASHTYPE_OPAQUE 0xf /* ordering, not affinity */ + +#define M_HASHTYPE_CLEAR(m) (m)->m_flags &= ~(M_HASHTYPEBITS) +#define M_HASHTYPE_GET(m) (((m)->m_flags & M_HASHTYPEBITS) >> \ + M_HASHTYPE_SHIFT) +#define M_HASHTYPE_SET(m, v) do { \ + (m)->m_flags &= ~M_HASHTYPEBITS; \ + (m)->m_flags |= ((v) << M_HASHTYPE_SHIFT); \ +while (0) +#define M_HASHTYPE_TEST(m, v) (M_HASHTYPE_GET(m) == (v)) + +/* * Flags preserved when copying m_pkthdr. */ #define M_COPYFLAGS \ (M_PKTHDR|M_EOR|M_RDONLY|M_PROTOFLAGS|M_SKIP_FIREWALL|M_BCAST|M_MCAST|\ - M_FRAG|M_FIRSTFRAG|M_LASTFRAG|M_VLANTAG|M_PROMISC|M_FIB) + M_FRAG|M_FIRSTFRAG|M_LASTFRAG|M_VLANTAG|M_PROMISC|M_FIB|M_HASHTYPEBITS) /* * External buffer types: identify ext_buf type. |
