doc: fix names of UIO drivers

[dpdk.git] / doc / guides / nics / netvsc.rst

diff --git a/doc/guides/nics/netvsc.rst b/doc/guides/nics/netvsc.rst
index 5a68ffa..c0e218c 100644 (file)
--- a/doc/guides/nics/netvsc.rst
+++ b/doc/guides/nics/netvsc.rst
@@ -62,7 +62,7 @@ store it in a shell variable:
 
 .. _`UUID`: https://en.wikipedia.org/wiki/Universally_unique_identifier
 
-There are several possible ways to assign the uio device driver for a device.
+There are several possible ways to assign the UIO device driver for a device.
 The easiest way (but only on 4.18 or later)
 is to use the `driverctl Device Driver control utility`_ to override
 the normal kernel device.
@@ -133,3 +133,11 @@ The user can specify below argument in devargs.
     set larger than the MTU, then all packets smaller than the chunk size
     of the VMBus send buffer will be copied; larger packets always have to
     go as a single direct request. The default value is 512 (bytes).
+
+#.  ``rx_extmbuf_enable``:
+    The rx_extmbuf_enable is used to control if netvsc should use external
+    mbuf for receiving packets. The default value is 0. (netvsc doesn't use
+    external mbuf, it always allocates mbuf and copy received data to mbuf)
+    A non-zero value tells netvsc to attach external buffers to mbuf on
+    receiving packets, thus avoid copying memory. Use of external buffers
+    requires the application is able to read data from external mbuf.