- 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/powerpc/include/atomic.h b/sys/powerpc/include/atomic.h
index d515a6a..4ac9f0c 100644
--- a/sys/powerpc/include/atomic.h
+++ b/sys/powerpc/include/atomic.h
@@ -39,6 +39,10 @@
 #define	__ATOMIC_BARRIER					\
     __asm __volatile("sync" : : : "memory")
 
+#define mb()	__ATOMIC_BARRIER
+#define	wmb()	mb()
+#define	rmb()	mb()
+
 /*
  * atomic_add(p, v)
  * { *p += v; }