X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=linux_module%2Fiface-keyed-stream-user.h;h=85ab0e619faea4030b3c67a9aecf2c5e1f8600f5;hb=95a09f3e974f23d8e3d20b3a333f5c07631be17d;hp=0ab1738b323e1889e25b79f9074c598d67acb34c;hpb=6ce41e0f30868d2905e12a4f15ce9a11fd439e8c;p=palacios.git

diff --git a/linux_module/iface-keyed-stream-user.h b/linux_module/iface-keyed-stream-user.h
index 0ab1738..85ab0e6 100644
--- a/linux_module/iface-keyed-stream-user.h
+++ b/linux_module/iface-keyed-stream-user.h
@@ -7,8 +7,7 @@
  */
 
 
-// Attach to the VM
-#define V3_VM_KSTREAM_USER_CONNECT     (11244+1)
+// Issue a V3_VM_KSTREAM_USER_CONNECT on the VM to acquire an fd for the device
 
 // get size of pending request
 // Note that this is not the wrong ioctl - the connect ioctl applies to the VM device
@@ -36,6 +35,10 @@ struct palacios_user_keyed_stream_url {
 // This structure is used for both requests (kernel->user)
 // and responses (user->kernel)
 //
+// for a readkey request, the buf contains the tag
+// for a readkey response, the buf contains the data
+// for a writekey request, the buf contains the data + key
+// for a writekey request, the buf contains nothing
 struct palacios_user_keyed_stream_op {
 
     uint64_t len; // total structure length (all)
@@ -49,13 +52,17 @@ struct palacios_user_keyed_stream_op {
 #define PALACIOS_KSTREAM_READ_KEY  6
 
     sint64_t xfer;      // total bytes read or written (request/response)
+                        // 
 
     void    *user_key;  // user tag for an open key (response)
 
     uint64_t buf_len;   // buffer len
-    char buf[0];        // expanded as needed (key or valye)
+    uint64_t data_off;  // offset of data within the buffer
+                        // 0..buffer_len-1 is tag
+                        // rest is data
+    char buf[0];        // expanded as needed (key or value)
 
-    // The buffer contains the key or the value
+    // The buffer contains the key or the value 
 };