- bump __FreeBSD version to reflect added buf_ring, memory barriers,

  and ifnet functions

- add memory barriers to <machine/atomic.h>
- update drivers to only conditionally define their own

- add lockless producer / consumer ring buffer
- remove ring buffer implementation from cxgb and update its callers

- add if_transmit(struct ifnet *ifp, struct mbuf *m) to ifnet to
  allow drivers to efficiently manage multiple hardware queues
  (i.e. not serialize all packets through one ifq)
- expose if_qflush to allow drivers to flush any driver managed queues

This work was supported by Bitgravity Inc. and Chelsio Inc.

1 files changed, 4 insertions, 0 deletions

diff --git a/sys/dev/nxge/xge-osdep.h b/sys/dev/nxge/xge-osdep.h
index 15adfe7..e8f4aba 100644
--- a/sys/dev/nxge/xge-osdep.h
+++ b/sys/dev/nxge/xge-osdep.h
@@ -242,8 +242,12 @@ typedef xge_pci_info_t             *pci_cfg_h;
 	mtx_unlock_flags(lockp, flags);                                        \
 }
 
+#if __FreeBSD_version > 800053
 /* Write memory barrier */
+#define xge_os_wmb()		wmb()	
+#else
 #define xge_os_wmb()
+#endif
 
 /* Delay (in micro seconds) */
 #define xge_os_udelay(us)            DELAY(us)