Fix max burst size computation

The units are "MTUs," not "bytes." With this in mind, we can burst the
minimum number of buffers.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/bd.rs b/src/bd.rs
index 9d7ac3c..1afb93b 100644
--- a/src/bd.rs
+++ b/src/bd.rs
@@ -153,6 +153,9 @@ impl<'a, D> IoSlices<'a, D> {
     pub(crate) fn mtu(&self) -> usize {
         self.mtu
     }
+    pub(crate) fn len(&self) -> usize {
+        self.ring.len()
+    }
 }
 
 impl<D> IoSlices<'_, D> {