Start process of removing the use of the deprecated "M_FLOWID" flag

from the FreeBSD network code. The flag is still kept around in the
"sys/mbuf.h" header file, but does no longer have any users. Instead
the "m_pkthdr.rsstype" field in the mbuf structure is now used to
decide the meaning of the "m_pkthdr.flowid" field. To modify the
"m_pkthdr.rsstype" field please use the existing "M_HASHTYPE_XXX"
macros as defined in the "sys/mbuf.h" header file.

This patch introduces new behaviour in the transmit direction.
Previously network drivers checked if "M_FLOWID" was set in "m_flags"
before using the "m_pkthdr.flowid" field. This check has now now been
replaced by checking if "M_HASHTYPE_GET(m)" is different from
"M_HASHTYPE_NONE". In the future more hashtypes will be added, for
example hashtypes for hardware dedicated flows.

"M_HASHTYPE_OPAQUE" indicates that the "m_pkthdr.flowid" value is
valid and has no particular type. This change removes the need for an
"if" statement in TCP transmit code checking for the presence of a
valid flowid value. The "if" statement mentioned above is now a direct
variable assignment which is then later checked by the respective
network drivers like before.

Additional notes:
- The SCTP code changes will be committed as a separate patch.
- Removal of the "M_FLOWID" flag will also be done separately.
- The FreeBSD version has been bumped.

MFC after:	1 month
Sponsored by:	Mellanox Technologies

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/dev/vxge/vxge.c b/sys/dev/vxge/vxge.c
index b89ba6cca51e..9a3cab654f95 100644
--- a/sys/dev/vxge/vxge.c
+++ b/sys/dev/vxge/vxge.c
@@ -660,7 +660,7 @@ vxge_mq_send(ifnet_t ifp, mbuf_t m_head)
 
 	if (vdev->config.tx_steering) {
 		i = vxge_vpath_get(vdev, m_head);
-	} else if ((m_head->m_flags & M_FLOWID) != 0) {
+	} else if (M_HASHTYPE_GET(m_head) != M_HASHTYPE_NONE) {
 		i = m_head->m_pkthdr.flowid % vdev->no_of_vpath;
 	}
 
@@ -1070,7 +1070,7 @@ vxge_rx_compl(vxge_hal_vpath_h vpath_handle, vxge_hal_rxd_h rxdh,
 		vxge_rx_checksum(ext_info, mbuf_up);
 
 #if __FreeBSD_version >= 800000
-		mbuf_up->m_flags |= M_FLOWID;
+		M_HASHTYPE_SET(mbuf_up, M_HASHTYPE_OPAQUE);
 		mbuf_up->m_pkthdr.flowid = vpath->vp_index;
 #endif
 		/* Post-Read sync for buffers */