vmxnet3: Add support for VMXNET3_CMD_GET_ADAPTIVE_RING_INFO command

Some drivers (e.g. vmware-tools) issue the VMXNET3_CMD_GET_ADAPTIVE_RING_INFO
command.

Currently, due to lack of support, a bogus value (-1) is returned.

Support this command, returning the "adaptive-ring disabled" flag.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@ravellosystems.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

hw/net/vmxnet3.c

@@ -1631,6 +1631,11 @@ static void vmxnet3_handle_command(VMXNET3State *s, uint64_t cmd)
         VMW_CBPRN("Set: VMXNET3_CMD_GET_CONF_INTR - interrupt configuration");
         break;
 
+    case VMXNET3_CMD_GET_ADAPTIVE_RING_INFO:
+        VMW_CBPRN("Set: VMXNET3_CMD_GET_ADAPTIVE_RING_INFO - "
+                  "adaptive ring info flags");
+        break;
+
     default:
         VMW_CBPRN("Received unknown command: %" PRIx64, cmd);
         break;
@@ -1670,6 +1675,10 @@ static uint64_t vmxnet3_get_command_status(VMXNET3State *s)
         ret = vmxnet3_get_interrupt_config(s);
         break;
 
+    case VMXNET3_CMD_GET_ADAPTIVE_RING_INFO:
+        ret = VMXNET3_DISABLE_ADAPTIVE_RING;
+        break;
+
     default:
         VMW_WRPRN("Received request for unknown command: %x", s->last_command);
         ret = -1;

hw/net/vmxnet3.h

@@ -198,9 +198,13 @@ enum {
     VMXNET3_CMD_GET_DID_LO,                               /* 0xF00D0005 */
     VMXNET3_CMD_GET_DID_HI,                               /* 0xF00D0006 */
     VMXNET3_CMD_GET_DEV_EXTRA_INFO,                       /* 0xF00D0007 */
-    VMXNET3_CMD_GET_CONF_INTR                             /* 0xF00D0008 */
+    VMXNET3_CMD_GET_CONF_INTR,                            /* 0xF00D0008 */
+    VMXNET3_CMD_GET_ADAPTIVE_RING_INFO                    /* 0xF00D0009 */
 };
 
+/* Adaptive Ring Info Flags */
+#define VMXNET3_DISABLE_ADAPTIVE_RING 1
+
 /*
  *    Little Endian layout of bitfields -
  *    Byte 0 :    7.....len.....0