lguest: update commentry

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 6554148..7228369 100644 (file)
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -895,6 +895,9 @@ static void handle_console_output(int fd, struct virtqueue *vq, bool timeout)
        }
 }
 
+/* This is called when we no longer want to hear about Guest changes to a
+ * virtqueue.  This is more efficient in high-traffic cases, but it means we
+ * have to set a timer to check if any more changes have occurred. */
 static void block_vq(struct virtqueue *vq)
 {
        struct itimerval itm;
@@ -939,6 +942,11 @@ static void handle_net_output(int fd, struct virtqueue *vq, bool timeout)
        if (!timeout && num)
                block_vq(vq);
 
+       /* We never quite know how long should we wait before we check the
+        * queue again for more packets.  We start at 500 microseconds, and if
+        * we get fewer packets than last time, we assume we made the timeout
+        * too small and increase it by 10 microseconds.  Otherwise, we drop it
+        * by one microsecond every time.  It seems to work well enough. */
        if (timeout) {
                if (num < last_timeout_num)
                        timeout_usec += 10;

diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 37344aa..a661bbd 100644 (file)
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -98,6 +98,10 @@ static u32 lg_get_features(struct virtio_device *vdev)
        return features;
 }
 
+/* The virtio core takes the features the Host offers, and copies the
+ * ones supported by the driver into the vdev->features array.  Once
+ * that's all sorted out, this routine is called so we can tell the
+ * Host which features we understand and accept. */
 static void lg_finalize_features(struct virtio_device *vdev)
 {
        unsigned int i, bits;
@@ -108,6 +112,10 @@ static void lg_finalize_features(struct virtio_device *vdev)
        /* Give virtio_ring a chance to accept features. */
        vring_transport_features(vdev);
 
+       /* The vdev->feature array is a Linux bitmask: this isn't the
+        * same as a the simple array of bits used by lguest devices
+        * for features.  So we do this slow, manual conversion which is
+        * completely general. */
        memset(out_features, 0, desc->feature_len);
        bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
        for (i = 0; i < bits; i++) {