Lock down the network interface queues. The queue mutex must be obtained

before adding/removing packets from the queue.  Also, the if_obytes and
if_omcasts fields should only be manipulated under protection of the mutex.

IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on
the queue.  An IF_LOCK macro is provided, as well as the old (mutex-less)
versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which
needs them, but their use is discouraged.

Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF,
which takes care of locking/enqueue, and also statistics updating/start
if necessary.

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/netatalk/ddp_usrreq.c b/sys/netatalk/ddp_usrreq.c
index 167c0b3..617ab29 100644
--- a/sys/netatalk/ddp_usrreq.c
+++ b/sys/netatalk/ddp_usrreq.c
@@ -548,6 +548,8 @@ ddp_init(void )
 {
     atintrq1.ifq_maxlen = IFQ_MAXLEN;
     atintrq2.ifq_maxlen = IFQ_MAXLEN;
+    mtx_init(&atintrq1.ifq_mtx, "at1_inq", MTX_DEF);
+    mtx_init(&atintrq2.ifq_mtx, "at2_inq", MTX_DEF);
 }
 
 #if 0