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authorRusty Russell <rusty@rustcorp.com.au>2008-05-30 15:09:45 -0500
committerRusty Russell <rusty@rustcorp.com.au>2008-05-30 15:09:46 +1000
commitb4f68be6c5d507afdcd74f5be3df0b1209cda503 (patch)
tree85c0771058ff08c5dab5eedbf3395959dbafc878 /include/linux/virtio_config.h
parent7757f09c70af87887dfc195e6d6ddd54f5cc7c39 (diff)
virtio: force callback on empty.
virtio allows drivers to suppress callbacks (ie. interrupts) for efficiency (no locking, it's just an optimization). There's a similar mechanism for the host to suppress notifications coming from the guest: in that case, we ignore the suppression if the ring is completely full. It turns out that life is simpler if the host similarly ignores callback suppression when the ring is completely empty: the network driver wants to free up old packets in a timely manner, and otherwise has to use a timer to poll. We have to remove the code which ignores interrupts when the driver has disabled them (again, it had no locking and hence was unreliable anyway). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/virtio_config.h')
-rw-r--r--include/linux/virtio_config.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 71d6c102497..f364bbf63c3 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -15,6 +15,10 @@
/* We've given up on this device. */
#define VIRTIO_CONFIG_S_FAILED 0x80
+/* Do we get callbacks when the ring is completely used, even if we've
+ * suppressed them? */
+#define VIRTIO_F_NOTIFY_ON_EMPTY 24
+
#ifdef __KERNEL__
#include <linux/virtio.h>